JP2000094027A - Method for cooling u-shaped sheet pile and device therefor - Google Patents

Method for cooling u-shaped sheet pile and device therefor

Info

Publication number
JP2000094027A
JP2000094027A JP26661998A JP26661998A JP2000094027A JP 2000094027 A JP2000094027 A JP 2000094027A JP 26661998 A JP26661998 A JP 26661998A JP 26661998 A JP26661998 A JP 26661998A JP 2000094027 A JP2000094027 A JP 2000094027A
Authority
JP
Japan
Prior art keywords
sheet pile
cooling
steel sheet
shaped steel
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP26661998A
Other languages
Japanese (ja)
Other versions
JP3345776B2 (en
Inventor
Makoto Nakaseko
誠 中世古
Teruo Fujibayashi
晃夫 藤林
Shigeo Okamoto
成夫 岡本
Hajime Tsukawaki
始 塚脇
Yukio Fujii
幸生 藤井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP26661998A priority Critical patent/JP3345776B2/en
Publication of JP2000094027A publication Critical patent/JP2000094027A/en
Application granted granted Critical
Publication of JP3345776B2 publication Critical patent/JP3345776B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To greatly reduce the contact ratio of a cooling liquid to the flange parts of a U-shaped sheet pile which is placed in a reverse U-shaped posture, to enable cooling only the web part and to compress the average temp. difference between flange parts and a web part over a conventional limit. SOLUTION: At the time of cooling the web part 2 of the U-shaped sheet pile 1 which is conveyed in the reverse IL-shaped posture on the transfer line by jetting a cooling medium to the underside of the web of the high-temp. U-shaped sheet pile 1, the cooling medium is jetted from plural jet nozzles 13 which are arranged between the underside of the web of the U-shaped sheet pile 1 which is conveyed in the reverse U-shaped posture and the face of the transfer line so that uncooled parts of a prescribed width are formed between the fillets 4 of the U-shaped sheet pile 1 and colliding points of the cooling medium and the contact ratio of the cooling medium to the flanges 3 becomes <=15% by adjusting jet pressure or a jet angle.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ウェブを有し搬送
ライン上を逆Ｕ字姿勢で搬送されながら熱間圧延で製造
されるＵ形鋼矢板の製造時の冷却方法およびその装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling method and apparatus for manufacturing a U-shaped steel sheet pile manufactured by hot rolling while being transported in a reverse U-shape on a transport line and having a web. is there.

【０００２】[0002]

【従来の技術】ウェブを有するＵ形鋼矢板は、一般に素
材を加熱し、粗圧延機、一台以上の中間圧延機、仕上げ
圧延機の各孔形圧延によって製造される。2. Description of the Related Art A U-shaped sheet pile having a web is generally produced by heating a material and forming each hole by a rough rolling mill, one or more intermediate rolling mills, and a finishing rolling mill.

【０００３】図１５はこのような圧延工程を経て製造さ
れた一般的なＵ形鋼矢板の各部分を説明する説明図であ
る。図において、１はＵ形鋼矢板、２はそのウェブ部、
３はそのフランジ部、４はそのフィレット部、５はその
フランジ両端に形成された爪部、Ｗはウェブ下面の内法
を示す。FIG. 15 is an explanatory view for explaining each part of a general U-shaped steel sheet pile manufactured through such a rolling process. In the figure, 1 is a U-shaped steel sheet pile, 2 is its web part,
Reference numeral 3 denotes the flange portion, 4 denotes the fillet portion, 5 denotes claw portions formed at both ends of the flange, and W denotes the inner dimension of the lower surface of the web.

【０００４】このようなＵ形鋼矢板１は、一般にウェブ
部２の肉厚がフランジ部３の肉厚よりも厚いため、圧延
終了直後の各部の平均温度はウェブ部２の方がフランジ
部３より５０〜１５０℃あるいはそれ以上に温度が高
い。そのため、図１６の（ａ）（ｂ）に示すように変態
点Ａｒ３以上の変態開始前の温度で圧延が終了し、冷却
床で放冷させると、圧延後の真直な状態から、放冷され
るにつれて熱収縮差により、温度が高いウェブ２部がフ
ランジ部３に比べて相対的に短くなって全長曲がりが生
じ、最終的にウェブ部２を内側に、爪部５，５を外側に
して、図１７示すような上下方向の大きな反り（上反
り）が発生し、搬送上のトラブルや、冷間矯正が難しく
なる等の不具合が多々発生する。なお、図１７中のｈは
反り量である。In such a U-shaped sheet pile 1, since the thickness of the web portion 2 is generally thicker than the thickness of the flange portion 3, the average temperature of each portion immediately after the end of rolling is higher in the web portion 2 than in the flange portion 3. The temperature is higher than 50-150 ° C or more. Therefore, as shown in (a) and (b) of FIG. 16, the rolling is completed at the temperature before the start of the transformation at the transformation point Ar3 or more, and when it is cooled on the cooling floor, it is cooled from the straight state after the rolling. Due to the difference in heat shrinkage, the high-temperature web 2 is relatively shorter than the flange 3 due to the difference in heat shrinkage, and the entire length of the web 2 is bent. Finally, the web 2 is inward and the claws 5 and 5 are outward. A large vertical warp (upward warp) as shown in FIG. 17 occurs, which often causes troubles such as troubles in conveyance and difficulty in correcting the cold. Note that h in FIG. 17 is the amount of warpage.

【０００５】このような上反りの解消・あるいは低減さ
せる手法として従来以下のようなものが提案されてい
る。例えば特開昭57-149003 号公報（第１従来例）に
は、最終仕上げ圧延直前にＵ形鋼矢板のフランジ部を変
態点Ａｒ３と変態点Ａｒ１との間の温度に冷却処理を行
ってから最終仕上げ圧延することで、上反り発生を抑え
るようにしたものが示されている。Conventionally, the following methods have been proposed as a method for eliminating or reducing such warpage. For example, Japanese Patent Application Laid-Open No. 577-149003 (first conventional example) discloses that a flange portion of a U-shaped sheet pile is cooled to a temperature between a transformation point Ar3 and a transformation point Ar1 immediately before final finish rolling. The figure shows a case in which the occurrence of warpage is suppressed by final finishing rolling.

【０００６】また、例えば特開昭58-215203 号公報（第
２従来例）には、図１８及び図１９に示すようにフラン
ジ部３とウェブ部２の温度調整を、逆Ｕ字姿勢に置かれ
たＵ形鋼矢板１の上下に配置したフルコーンスプレー様
のノズル６よりそれぞれの部位に水を噴射することで行
なうとともに、その際、仕上げ圧延前のウェブ部２の温
度をフェライト変態開始温度の変態点Ａｒ３以下とし、
かつフランジ部３とウェブ部２の平均温度差を５０℃以
内に抑えるようにして、上反り発生を抑えるようにした
ものが示されている。For example, Japanese Patent Application Laid-Open No. 58-215203 (second conventional example) discloses that the temperature of the flange portion 3 and the web portion 2 is adjusted in an inverted U-shape as shown in FIGS. Water is sprayed from a full cone spray-like nozzle 6 placed above and below the U-shaped sheet pile 1 to each site, and at this time, the temperature of the web portion 2 before finish rolling is changed to the ferrite transformation start temperature. The transformation point of Ar3 or less,
In addition, the average temperature difference between the flange portion 3 and the web portion 2 is suppressed to 50 ° C. or less to suppress the occurrence of the warpage.

【０００７】また、例えば特開昭59-7419 号公報（第３
従来例）には、最終仕上げ圧延前から仕上げ圧延後に至
るまでウェブ部の水冷を行なうともに、その際、最終仕
上圧延時点から圧延後におけるフェライト変態終了時点
までのウェブ部の平均温度Ｔｗとフランジ部の平均温度
Ｔｆとの平均温度差（Ｔｗ−Ｔｆ）を５０℃以下に保持
させ、かつ圧延前の冷却姿勢は逆Ｕ字姿勢、圧延後の冷
却姿勢はＵ字姿勢として、いずれも下方に配置したノズ
ルよりウェブ部位に水を噴射することで行ない、これに
よって上反り発生を抑えるようにしたものが示されてい
る。Further, for example, Japanese Patent Application Laid-Open No. Sho 59-7419 (No. 3)
In the conventional example), the web portion is water-cooled from before the final finish rolling to after the finish rolling, and at this time, the average temperature Tw of the web portion and the flange portion from the time of the final finish rolling to the end of the ferrite transformation after the rolling are completed. The average temperature difference (Tw-Tf) from the average temperature Tf is maintained at 50 ° C. or lower, and the cooling posture before rolling is an inverted U-shape, and the cooling posture after rolling is a U-shape. This is performed by injecting water from a nozzle into a web portion, thereby suppressing occurrence of warpage.

【０００８】また、例えば特開昭63-220917 号公報（第
４従来例）には、圧延終了後、強制的にＵ形鋼矢板を拘
束して、水冷などの強制冷却による手段を用いて冷却
し、変態点を下回る温度あるいは必要な部分を冷却し
て、冷却後拘束を解くことで、上反り発生を抑えるよう
にしたものが示されている。For example, Japanese Patent Application Laid-Open No. 63-220917 (fourth conventional example) discloses that after rolling is completed, a U-shaped steel sheet pile is forcibly restrained and cooled by means of forced cooling such as water cooling. In addition, a temperature lower than the transformation point or a necessary portion is cooled, and after the cooling, the restraint is released to suppress the occurrence of the warpage.

【０００９】また、例えば特公平6-102202号公報（第５
従来例）には、仕上げ圧延の最終パスを通すに先立ち、
Ｕ形鋼矢板を拘束して冷却し、その後、最終パスを通す
再圧延を行なうことで、上反り発生を抑えるようにした
ものが示されている。Further, for example, Japanese Patent Publication No. 6-102202 (No. 5)
Prior to the final pass of finish rolling,
A U-shaped sheet pile is restrained and cooled, and then rerolling is performed through a final pass to suppress the occurrence of warpage.

【００１０】[0010]

【発明が解決しようとする課題】しかしながら、最終仕
上げ圧延直前にＵ形鋼矢板のフランジ部を変態点Ａｒ３
と変態点Ａｒ１との間の温度に冷却処理を行ってから最
終仕上げ圧延する第１従来例にあっては、ウェブ部の温
度が既述したようにフランジ部より５０〜１５０℃以上
高く、変態点Ａｒ３以上の温度となっている。従って、
フランジ部の温度のみに着目し、ウェブ部の温度調整に
ついての考慮がないこの第１従来例では、例えフランジ
部の温度を変態点Ａｒ３と変態点Ａｒ１の間に調整した
としても、その温度から常温までのフランジ部の収縮率
と、その間のウェブ部の収縮率が異なるため、放冷後の
常温時の上反り発生の抑制に限界がある。However, immediately before the final finish rolling, the flange portion of the U-shaped sheet pile is transformed into the transformation point Ar3.
In the first conventional example in which the cooling treatment is performed to a temperature between the temperature and the transformation point Ar1, and the final finish rolling is performed, the temperature of the web portion is higher than the flange portion by 50 to 150 ° C. or more as described above, The temperature is higher than the point Ar3. Therefore,
In this first conventional example, which focuses only on the temperature of the flange portion and does not consider the temperature adjustment of the web portion, even if the temperature of the flange portion is adjusted between the transformation points Ar3 and Ar1, Since the shrinkage ratio of the flange portion up to room temperature and the shrinkage ratio of the web portion therebetween are different, there is a limit in suppressing the occurrence of warpage at room temperature after cooling.

【００１１】また、フランジ部とウェブ部の温度調整
を、逆Ｕ字姿勢に置かれたＵ形鋼矢板の上下に配置した
フルコーンスプレー様のノズルよりそれぞれの部位に水
を噴射することで行っている第２従来例にあっては、以
下のような問題が存在している。 ａ）ウェブ上面から冷却液をかけると、図１８に示すよ
うにＵ形鋼矢板１表面の両フランジ部３，３から両爪部
５，５まで冷却液がかかり、フランジ部とウェブ部の両
方が水冷され、肉厚の薄い両フランジ部３，３の冷却が
進んでしまい、ウェブ部２と両フランジ部３，３の温度
差が広がってしまうばかりでなく、両フランジ部３，３
の先端が過冷却されてしまう。 ｂ）また、ウェブ下面からウェブ部分をねらって冷却液
を噴射させると、図１９示すようにＵ形鋼矢板１のウェ
ブ部２は当然冷却されるが、Ｕ形鋼矢板１の形状とフル
コーンスプレー様のノズルの噴射形態により、ウェブ部
２に当たった冷却液は両フランジ部３，３へ流れて接触
し、フランジ部とウェブ部の両方が水冷され、肉厚の薄
い両フランジ部３，３の冷却が進んでしまい、ウェブ部
２と両フランジ部３，３の温度差が広がってしまう。な
お、ここでいうフランジ部への冷却液の接触とは、ウェ
ブ部の面を伝って流れてくるものはもちろんのこと、ウ
ェブ部の面で跳ねてフランジ部へかかる跳水も含むもの
である。Further, the temperature of the flange portion and the web portion is adjusted by injecting water from a full cone spray-like nozzle disposed above and below a U-shaped steel sheet pile placed in an inverted U-shape to each portion. However, the second conventional example has the following problems. a) When the cooling liquid is applied from the upper surface of the web, as shown in FIG. 18, the cooling liquid is applied from both flange portions 3 and 3 to both claw portions 5 and 5 on the surface of the U-shaped steel sheet pile 1, and both the flange portion and the web portion are applied. Is cooled by water, and the cooling of the thin flange portions 3 and 3 progresses, so that the temperature difference between the web portion 2 and the flange portions 3 and 3 is widened, and the flange portions 3 and 3 are not only cooled.
Is supercooled. b) When the cooling liquid is sprayed from the lower surface of the web to aim at the web portion, the web portion 2 of the U-shaped steel sheet pile 1 is naturally cooled as shown in FIG. Due to the spray form of the spray-like nozzle, the coolant that has hit the web portion 2 flows into and contacts the two flange portions 3, 3, and both the flange portion and the web portion are water-cooled, and the two thin flange portions 3 are thin. 3, the temperature difference between the web portion 2 and the flange portions 3, 3 widens. Here, the contact of the cooling liquid with the flange portion includes not only a flow flowing along the surface of the web portion but also a water splashing on the flange portion by the surface of the web portion.

【００１２】そこで、この第２従来例では、仕上げ圧延
前のウェブ部２の温度をフェライト変態開始温度の変態
点Ａｒ３以下とし、かつフランジ部３とウェブ部２の平
均温度差を５０℃以内に抑えるようにしているが、この
場合には以下のような問題が発生する。 ｃ）一般にＵ形鋼矢板は孔型圧延によって行われてお
り、フェライト変態開始温度まで温度を下げて圧延する
ことは、圧延機や圧延ローラに負荷がかかり過ぎ、仕上
げ圧延が厳しくなる。 ｄ）逆Ｕ字姿勢に置かれたＵ形鋼矢板１は、フィレット
部の温度が最も高く、更にフランジ部３、ウェブ部２の
それぞれの面内における温度分布も一様でなく、その
上、フランジ部３とウェブ部２の間で平均温度差が生じ
ているため、ウェブ部とフランジ部それぞれの温度を調
整することは容易でなく、平均温度差を縮めるのに限界
がある。Therefore, in the second conventional example, the temperature of the web portion 2 before the finish rolling is set to the transformation point Ar3 of the ferrite transformation start temperature or lower, and the average temperature difference between the flange portion 3 and the web portion 2 is within 50 ° C. In this case, the following problem occurs. c) In general, U-shaped steel sheet piles are formed by groove rolling. If the temperature is reduced to the ferrite transformation start temperature and rolling is performed, a load is excessively applied to a rolling mill or a rolling roller, and finish rolling becomes severe. d) In the U-shaped steel sheet pile 1 placed in the inverted U-shape, the temperature of the fillet portion is the highest, and the temperature distribution in the plane of each of the flange portion 3 and the web portion 2 is not uniform. Since an average temperature difference occurs between the flange portion 3 and the web portion 2, it is not easy to adjust the temperatures of the web portion and the flange portion, and there is a limit in reducing the average temperature difference.

【００１３】また、この第２従来例では、Ｕ形鋼矢板を
Ｕ字姿勢にしてウェブ部とフランジ部を冷却することに
ついても開示されているが、この場合には以下のような
問題が発生する。 ｅ）Ｕ形鋼矢板の圧延ライン内での搬送は一般に搬送ロ
ールにより行われており、Ｕ字姿勢にした場合、ウェブ
部の表面に疵が付くのを避けられない上、Ｕ形鋼矢板を
Ｕ字姿勢にするための反転装置が新たに必要となり、製
造上のコストアップとなる。 ｆ）冷却時においてもＵ形鋼矢板を搬送せねばならず、
Ｕ字姿勢では前記ｅ）と同様にウェブ表面に疵が発生す
るおそれがある。Further, in the second conventional example, it is disclosed that the web portion and the flange portion are cooled by setting the U-shaped steel sheet pile in a U-shaped posture, but in this case, the following problem occurs. I do. e) The conveyance of the U-shaped steel sheet pile in the rolling line is generally performed by a conveyance roll. When the U-shaped attitude is adopted, the surface of the web portion is unavoidably flawed, and the U-shaped steel sheet pile is removed. A reversing device for U-shaped posture is newly required, which increases the manufacturing cost. f) The U-shaped sheet pile must be transported even during cooling,
In the U-shaped posture, there is a possibility that a flaw is generated on the web surface as in the above e).

【００１４】また、最終仕上げ圧延前から仕上げ圧延後
に至るまでウェブ部の水冷を行なうともに、その際、最
終仕上圧延時点から圧延後におけるフェライト変態終了
時点までのウェブ部の平均温度Ｔｗとフランジ部の平均
温度Ｔｆとの平均温度差（Ｔｗ−Ｔｆ）を５０℃以下に
保持させ、かつ圧延前の冷却姿勢は逆Ｕ字姿勢、圧延後
の冷却姿勢はＵ字姿勢として、いずれも下方に配置した
ノズルよりウェブ部位に水を噴射することで行ない、こ
れによって上反り発生を抑えるようにした第３従来例に
あっても、前述の第２従来例と同様に前記ｂ），ｄ），
ｅ），ｆ）のような問題が存在する。Further, the web portion is water-cooled from before the final finish rolling to after the finish rolling, and at this time, the average temperature Tw of the web portion from the time of the final finish rolling to the end of the ferrite transformation after the rolling and the flange portion are cooled. The average temperature difference (Tw-Tf) from the average temperature Tf was kept at 50 ° C. or less, and the cooling posture before rolling was an inverted U-shape, and the cooling posture after rolling was a U-shape, both of which were arranged below. Even in the third conventional example in which water is injected from the nozzle to the web portion to thereby suppress the occurrence of warpage, similarly to the second conventional example, b), d), and
Problems such as e) and f) exist.

【００１５】また、圧延終了後、強制的にＵ形鋼矢板を
拘束して、水冷などの強制冷却による手段を用いて冷却
し、変態点を下回る温度あるいは必要な部分を冷却し
て、冷却後拘束を解くことで、上反り発生を抑えるよう
にした第４従来例にあっては、大量生産されるＵ形鋼矢
板の製造ライン内に拘束装置が設置されることとなり、
生産性を著しく阻害するばかりでなく、拘束装置の設備
投資がかかるのは避けられない。After the rolling is completed, the U-shaped steel sheet pile is forcibly restrained and cooled by means of forced cooling such as water cooling, and the temperature below the transformation point or a necessary portion is cooled. In the fourth conventional example in which the occurrence of the warpage is suppressed by releasing the restraint, the restraint device is installed in the production line of the mass-produced U-shaped sheet pile,
In addition to significantly impairing productivity, it is inevitable that capital expenditures for restraint devices will be required.

【００１６】また、仕上げ圧延の最終パスを通すに先立
ち、Ｕ形鋼矢板を拘束して冷却し、その後、最終パスを
通す再圧延を行なうことで、上反り発生を抑えるように
した第５従来例にあっても、前述の第４従来例と同様に
製造ライン内に拘束装置が設置される関係で、生産性が
低下し、かつ設備投資が必要となる。Further, prior to passing through the final pass of the finish rolling, the U-shaped sheet pile is restrained and cooled, and then re-rolled through the final pass, thereby suppressing the occurrence of warpage. Even in this example, productivity is reduced and capital investment is required because the restraint device is installed in the production line as in the fourth conventional example.

【００１７】以上のように、いずれの従来例において
も、Ｕ形鋼矢板の厚いウェブ部を強制冷却する必要性に
触れてはいるものの、逆Ｕ字姿勢での圧延中、圧延機の
間、圧延終了後、又は拘束しながら、のいずれの時点に
おいても、フランジ部への冷却液の接触率を低減させな
がらウェブ部のみを冷却することについての考査がな
く、フランジ部とウェブ部の平均温度差を縮めるのに限
界があり、平均温度差を４０〜５０℃位までしか縮めら
れないのが実状であった。As described above, in each of the conventional examples, although the necessity of forcibly cooling the thick web portion of the U-shaped sheet pile is mentioned, during rolling in the inverted U-shape, during rolling, At any time after the end of rolling or while restraining, there is no examination about cooling only the web part while reducing the contact rate of the cooling liquid to the flange part, and the average temperature of the flange part and the web part There was a limit in reducing the difference, and the actual situation was that the average temperature difference could only be reduced to about 40 to 50 ° C.

【００１８】本発明者等は、その原因を探求し、逆Ｕ字
姿勢におかれたＵ形鋼矢板のフランジ部への冷却液の接
触率を低減させてウェブ部の冷却効率をあげるには、
Ｕ形鋼矢板のフィレットと冷却液の衝突点との間に所定
幅の非冷却部を形成すること、フランジ部への冷却液
の接触率を１５％以下に抑えること、前記を実現
するためには、フルコーンスプレーノズルのように冷却
液を拡散放出するノズルは不適であり、ノズルとしては
冷却液を拡散せずストレート状に噴出できて、ウェブ部
の下面に近設配置できる形態をとらせることが好ましい
こと、前記非冷却幅と噴射圧力とは密接に関係してお
り、その関係を明確にすることで、初めてフランジ部へ
の冷却液の接触率１５％以下の制御が可能となること、
を発見した。The present inventors have searched for the cause, and to increase the cooling efficiency of the web portion by reducing the contact ratio of the coolant to the flange portion of the U-shaped sheet pile in the inverted U-shape. ,
To form an uncooled portion having a predetermined width between the fillet of the U-shaped steel sheet pile and the collision point of the coolant, to suppress the contact ratio of the coolant to the flange portion to 15% or less, and to realize the above. However, a nozzle that diffuses and discharges a cooling liquid, such as a full cone spray nozzle, is not suitable, and as a nozzle, it can be ejected in a straight shape without diffusing the cooling liquid and can be arranged close to the lower surface of the web part It is preferable that the non-cooling width and the injection pressure are closely related to each other, and by clarifying the relationship, it is possible to control the contact ratio of the cooling liquid to the flange portion to 15% or less for the first time. ,
Was found.

【００１９】本発明は、叙上の問題点と、従来知られて
いなかった前記〜の知見に鑑み、逆Ｕ字姿勢におか
れたＵ形鋼矢板のフランジ部分への冷却液の接触率を大
きく低減できて、ウェブ部分のみの冷却を可能にし、フ
ランジ部とウェブ部の平均温度差を従来の限界を超えて
圧縮できるようにすることを目的とする。In view of the above-mentioned problems and the above-mentioned findings which have not been known, the present invention reduces the contact ratio of the coolant to the flange portion of the U-shaped sheet pile in the inverted U-shape. It is an object of the present invention to greatly reduce the temperature of a web portion, thereby enabling cooling only of the web portion, and to compress the average temperature difference between the flange portion and the web portion beyond a conventional limit.

【００２０】[0020]

【課題を解決するための手段】本発明の請求項１に係る
Ｕ形鋼矢板の冷却方法は、搬送ライン上を逆Ｕ字姿勢で
搬送される高温のＵ形鋼矢板のウェブとフランジとの肉
厚差により生じる温度差を縮めるために、ウェブ下面に
冷媒を噴射してウェブ部を冷却するに際し、逆Ｕ字姿勢
で搬送されるＵ形鋼矢板のウェブ下面と搬送ライン面と
の間に配置した複数の噴射孔より、Ｕ形鋼矢板のフィレ
ットと冷媒の衝突点との間に所定幅の非冷却部が形成さ
れるように、かつフランジヘの冷媒の接触率が１５％以
下になるように噴射圧力または噴射角度を調整して、冷
媒を噴射させることを特徴としている。According to a first aspect of the present invention, there is provided a method of cooling a U-shaped steel sheet pile, comprising: In order to reduce the temperature difference caused by the wall thickness difference, when cooling the web part by injecting the refrigerant to the lower surface of the web, between the lower surface of the web of the U-shaped steel sheet pile conveyed in the inverted U-shape and the conveying line surface From the plurality of arranged injection holes, an uncooled portion having a predetermined width is formed between the fillet of the U-shaped steel sheet pile and the collision point of the refrigerant, and the contact ratio of the refrigerant to the flange is 15% or less. The refrigerant is injected by adjusting the injection pressure or the injection angle.

【００２１】また、この方法に用いられる冷却装置は、
請求項５のように逆Ｕ字姿勢で搬送されるＵ形鋼矢板の
ウェブ下面と搬送ライン面との間にて、Ｕ形鋼矢板のウ
ェブエリア内に収まる幅とフランジエリア内に収まる高
さに設定されてライン方向に延びる箱形のヘッダと、ヘ
ッダの上面に形成した多数の噴射孔と、ヘッダ内に冷媒
を供給する冷媒供給管とから構成したものである。ま
た、この冷却装置においては、請求項６のようにＵ形鋼
矢板のフィレットと冷媒の衝突点との間に所定幅の非冷
却部が形成されるように各噴射孔が配置され、かつフラ
ンジヘの冷媒の接触率が１５％以下になるよう噴射圧力
が調整されてなるものである。また、この冷却装置にお
いては、請求項７のようにヘッダ上面の噴射孔形成部分
がヘッダ幅方向の中央部を底とする谷形に形成され、冷
媒噴出方向がウェブ面に対しウェブ幅方向の中央側に傾
くように構成されてなるものである。The cooling device used in this method is as follows:
A width that fits in the web area of the U-shaped steel sheet pile and a height that fits in the flange area between the lower surface of the web of the U-shaped steel sheet pile conveyed in the inverted U-shape and the conveying line surface as in claim 5. , A box-shaped header extending in the line direction, a large number of injection holes formed on the upper surface of the header, and a refrigerant supply pipe for supplying a refrigerant into the header. Further, in this cooling device, each injection hole is arranged so that an uncooled portion having a predetermined width is formed between the fillet of the U-shaped steel sheet pile and the collision point of the refrigerant, and the cooling device is provided with a flange. The injection pressure is adjusted so that the contact ratio of the refrigerant of the first embodiment becomes 15% or less. Further, in this cooling device, the injection hole forming portion on the top surface of the header is formed in a valley shape having a bottom at the center in the header width direction, and the refrigerant ejection direction is in the web width direction with respect to the web surface. It is configured to be inclined toward the center.

【００２２】また、本発明の請求項２に係るＵ形鋼矢板
の冷却方法は、逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウ
ェブ下面の冷媒が衝突する直接冷却域内において、フィ
レット寄りの両側部が中央部よりも冷却されるように、
ウェブ下面に対する冷媒の供給量をその両側部と中央部
とで異ならせることを特徴としている。Further, according to the method for cooling a U-shaped sheet pile according to a second aspect of the present invention, in the direct cooling area where the refrigerant on the lower surface of the web of the U-shaped sheet pile conveyed in the inverted U-shape collides with the fillet, So that both sides are cooler than the center,
It is characterized in that the supply amount of the refrigerant to the lower surface of the web is made different between the both sides and the center.

【００２３】また、この方法に用いられる請求項８の冷
却装置は、ヘッダ上面の幅方向両側部における単位面積
当たりの噴射孔の合計面積が、ヘッダ上面の幅方向中央
部における単位面積当たりの噴射孔の合計面積よりも大
きくなるように設定したものである。In the cooling device according to the present invention, the total area of the injection holes per unit area on both sides in the width direction of the top surface of the header is equal to the injection area per unit area in the center portion of the top surface of the header in the width direction. It is set so as to be larger than the total area of the holes.

【００２４】また、本発明の請求項３に係るＵ形鋼矢板
の冷却方法は、Ｕ形鋼矢板と噴射孔との心出しを行った
後、冷媒を供給することを特徴としている。Further, a cooling method for a U-shaped steel sheet pile according to a third aspect of the present invention is characterized in that a coolant is supplied after centering the U-shaped steel sheet pile and the injection hole.

【００２５】また、この方法に用いられる冷却装置は、
請求項９のようにヘッダのライン幅方向設定位置を可変
とするヘッダ位置決め機構を設けたものである。また、
この冷却装置においては、請求項１０のように搬送ライ
ン上に、Ｕ形鋼矢板の通過ラインの位置決めを行うガイ
ドを設けたものである。また、この冷却装置において
は、請求項１１のようにヘッダの最上流側に、先端を頂
点とする平面的にみて三角形の案内装置を設けたもので
ある。The cooling device used in this method is as follows:
According to a ninth aspect of the present invention, there is provided a header positioning mechanism for making the setting position of the header in the line width direction variable. Also,
In this cooling device, a guide for positioning the U-shaped sheet pile passing line is provided on the transport line. Further, in this cooling device, a guide device having a triangular shape as viewed in a plane having a tip as an apex is provided on the most upstream side of the header.

【００２６】また、本発明の請求項４に係るＵ形鋼矢板
の冷却方法は、冷却を、中間圧延工程と仕上げ圧延工程
の間に行うことを特徴としている。Further, a cooling method for a U-shaped steel sheet pile according to claim 4 of the present invention is characterized in that cooling is performed between an intermediate rolling step and a finish rolling step.

【００２７】また、この方法に用いられる請求項１２の
冷却装置は、搬送ライン上の中間圧延機と仕上げ圧延機
の間に冷却装置を配置したものである。The cooling device according to the twelfth aspect used in this method has a cooling device arranged between an intermediate rolling mill and a finishing rolling mill on a transport line.

【００２８】[0028]

【発明の実施の形態】実施形態１．以下、本発明の第１
の実施形態に係るＵ形鋼矢板の冷却方法およびこの方法
に用いられる装置を図１乃至図５に基づき説明する。図
１はこの第１実施形態に係るＵ形鋼矢板の冷却装置の構
成を示す斜視図、図２はその搬送ライン方向より示す縦
断面図、図３はそのノズルの噴射によって生じるフラン
ジ部への冷媒の接触率を説明するグラフと非冷却幅Ｄｆ
の説明図、図４はフランジ部への冷媒の接触率が１５％
未満となる非冷却幅と噴射圧力の関係を説明するグラ
フ、図５はこの第１実施形態を適用した圧延ラインの概
略図、図６はその冷却装置最上流側に設置した案内装置
を示す斜視図、図７はこの案内装置の諸元を説明するた
めの斜視図であり、Ｕ形鋼矢板の各部の構成は前述の従
来例（図１５）のものと同様であるので、同一符号を付
してある。また、ここでは冷媒として工業用水を使用し
たものを例に挙げて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. Hereinafter, the first of the present invention.
A method for cooling a U-shaped sheet pile and an apparatus used in this method according to the embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the configuration of a cooling device for a U-shaped steel sheet pile according to the first embodiment, FIG. 2 is a vertical sectional view showing the device in the direction of the conveying line, and FIG. Graph explaining the contact ratio of refrigerant and uncooled width Df
FIG. 4 shows that the contact ratio of the refrigerant to the flange portion is 15%.
5 is a schematic diagram of a rolling line to which the first embodiment is applied, and FIG. 6 is a perspective view showing a guide device installed on the most upstream side of the cooling device. FIGS. 7A and 7B are perspective views for explaining the specifications of the guide device. Since the configuration of each part of the U-shaped steel sheet pile is the same as that of the above-described conventional example (FIG. 15), the same reference numerals are used. I have. In addition, here, a description will be given of an example in which industrial water is used as a refrigerant.

【００２９】この第１実施形態に係るＵ形鋼矢板の冷却
装置は、図１及び図２に示すように冷却装置１１が、Ｕ
形鋼矢板１のウェブ部２のエリア内に収まる幅とフラン
ジ部３のエリア内に収まる高さに設定されてライン方向
に延びる箱形のヘッダ１２と、ヘッダ１２の上面に千鳥
状に形成した多数の噴射孔１３と、ヘッダ１２内に冷却
水を供給する冷却水供給管１４とから成り、ヘッダ上面
が多孔板ノズル１０に構成されていて、外部から供給管
１４を通してヘッダ１２内に冷却水を送り込み、上面の
多孔板ノズル１０より噴射して、ウェブ部２の下面を冷
却するようになっている。１５は搬送ローラ１５ａから
なる搬送ラインであり、ヘッダ１２は搬送ライン１５上
に配置され、冷却水供給管１４は搬送ローラ１５ａ間の
隙間より挿入されてヘッダ１２に接続されている。As shown in FIGS. 1 and 2, the cooling device 11 of the U-shaped steel sheet pile according to the first embodiment
A box-shaped header 12 that is set to have a width that fits in the area of the web portion 2 of the section steel sheet pile 1 and a height that fits in the area of the flange portion 3 and extends in the line direction, and is formed in a staggered manner on the upper surface of the header 12. It comprises a number of injection holes 13 and a cooling water supply pipe 14 for supplying cooling water into the header 12. The upper surface of the header is formed in the perforated plate nozzle 10, and the cooling water is supplied from outside into the header 12 through the supply pipe 14. And is sprayed from the perforated plate nozzle 10 on the upper surface to cool the lower surface of the web portion 2. Reference numeral 15 denotes a transfer line including transfer rollers 15a. The header 12 is disposed on the transfer line 15, and the cooling water supply pipe 14 is inserted through a gap between the transfer rollers 15a and connected to the header 12.

【００３０】多孔板ノズル１０の各噴射孔１３は、Ｕ形
鋼矢板１のフィレット部４と冷却水の衝突点との間に所
定幅の非冷却部すなわち非冷却幅Ｄｆ（図３）が形成さ
れるように配置されている。そして、フランジ部３ヘの
冷却水の接触率が１５％以下になるように噴射圧力が調
整されている。なお、図５中の符号１６は粗圧延機、１
７は第一中間圧延機、１８は第二中間圧延機、１９は仕
上げ圧延機、２１は第二中間圧延機１８と仕上げ圧延機
１９の間の搬送ラインの一側に配置した固定ガイド、２
２は同搬送ラインの他側に配置した位置決めガイド、１
１Ａ，１１Ｂ，１１Ｃは直列に３台設置されたこの第１
実施形態の冷却装置、２０はこの冷却装置の最上流側に
設置した先端を頂点とする平面的にみて三角形の案内装
置である。Each injection hole 13 of the perforated plate nozzle 10 has an uncooled portion having a predetermined width, that is, an uncooled width Df (FIG. 3), between the fillet portion 4 of the U-shaped steel sheet pile 1 and the collision point of the cooling water. It is arranged to be. The injection pressure is adjusted so that the contact ratio of the cooling water to the flange portion 3 becomes 15% or less. In addition, the code | symbol 16 in FIG.
7 is a first intermediate rolling mill, 18 is a second intermediate rolling mill, 19 is a finishing rolling mill, 21 is a fixed guide arranged on one side of a transport line between the second intermediate rolling mill 18 and the finishing rolling mill 19, 2
2 is a positioning guide arranged on the other side of the transport line, 1
1A, 11B, and 11C are three first units installed in series.
The cooling device 20 of the embodiment is a guide device having a triangular shape as viewed in a plan view with its tip located at the tip located at the most upstream side of the cooling device.

【００３１】固定ガイド２１と位置決めガイド２２は、
Ｕ形鋼矢板１の通過ラインの位置決めを行うものであ
り、Ｕ形鋼矢板１を拘束するものではない。The fixed guide 21 and the positioning guide 22 are
The positioning of the passing line of the U-shaped steel sheet pile 1 is performed, and the U-shaped steel sheet pile 1 is not restrained.

【００３２】案内装置２０は、Ｕ形鋼矢板１と冷却装置
のヘッダ１２との直接衝突を防止してヘッダ１２を保護
する機能と、衝突したＵ形鋼矢板１を正規の通過ライン
位置に導く機能を持っている。したがって、頂点の角度
が大きいと、Ｕ形鋼矢板１が衝突した際のライン方向分
力が大きくなって、Ｕ形鋼矢板１の流れが止まってしま
い調心機能が失われるので、頂点の角度は鋭角に設定す
ることが望ましく、ここでは図７に示すように頂点の角
度を３０゜に設定している。また頂点からヘッダ１２に
かけて上下方向に５゜のテーパをつけてあり、搬送され
るＵ形鋼矢板１に下反りが発生していても、スムーズに
ヘッダ１２の外側に挿入されるようになっている。案内
装置２０のヘッダ１２と接触する部分は、ヘッダ１２の
端面と同じ大きさとなるように設定され、ここでは幅２
２０mm、高さ１００mm、全長４１０mmに設定してある。
このように、案内装置２０を左右側面が傾斜する基本的
にくさび形に形成することで、主目的とする左右方向の
調心機能を高めることができる。しかし、案内装置２０
の形状はこのくさび形に限定されるものでなく、先端が
尖った角錐形の採用も可能であり、この場合でもくさび
形と同等の作用効果が期待できる。The guide device 20 protects the header 12 by preventing direct collision between the U-shaped sheet pile 1 and the header 12 of the cooling device, and guides the collided U-shaped sheet pile 1 to a regular passing line position. Have a function. Therefore, when the angle of the vertex is large, the component force in the line direction when the U-shaped steel sheet pile 1 collides becomes large, and the flow of the U-shaped steel sheet pile 1 stops, and the centering function is lost. Is desirably set to an acute angle. Here, the vertex angle is set to 30 ° as shown in FIG. Also, a taper of 5 ° is provided in the vertical direction from the top to the header 12 so that even if the U-shaped steel sheet pile 1 being conveyed has a downward warp, it can be smoothly inserted outside the header 12. I have. The portion of the guide device 20 that comes into contact with the header 12 is set to have the same size as the end face of the header 12, and here the width 2
It is set to 20 mm, height 100 mm, and total length 410 mm.
As described above, by forming the guide device 20 in a basically wedge shape in which the left and right side surfaces are inclined, the centering function in the left and right direction, which is the main purpose, can be enhanced. However, the guide device 20
The shape of is not limited to this wedge shape, and a pyramid having a sharp tip can be adopted. In this case, the same operation and effect as the wedge shape can be expected.

【００３３】図５に示すようにこの第１実施形態の冷却
装置１１Ａ，１１Ｂ，１１Ｃは、第二中間圧延機１８と
仕上げ圧延機１９の間に配置されている。これ以降、１
つの冷却装置を１ゾーンと呼ぶ。As shown in FIG. 5, the cooling devices 11A, 11B and 11C according to the first embodiment are arranged between a second intermediate rolling mill 18 and a finishing rolling mill 19. After this, 1
One cooling device is called one zone.

【００３４】図３のグラフは、ウェブ部２の下面と多孔
板ノズル１０の上面との間の距離Ｈを５０mmに設定し
て、非冷却幅Ｄｆが２０mm、５０mm、１００mmのそれぞ
れの場合における多孔板ノズル１０の噴射圧力とフラン
ジ部ヘの冷却水の接触率との関係を求めた実験結果を示
し、縦軸に接触率を、横軸に噴射圧力をとったものであ
る。The graph of FIG. 3 shows the case where the distance H between the lower surface of the web portion 2 and the upper surface of the perforated plate nozzle 10 is set to 50 mm, and the uncooled width Df is 20 mm, 50 mm, and 100 mm, respectively. An experimental result is shown in which the relationship between the injection pressure of the plate nozzle 10 and the contact ratio of the cooling water to the flange portion is shown, in which the vertical axis represents the contact ratio and the horizontal axis represents the injection pressure.

【００３５】図３から明らかなように、噴射圧力を高く
するとフランジ部３ヘの冷却水の接触率が上がる。また
同じ噴射圧力でも冷却水がかかる直接冷却域をフランジ
部３から離すと、つまり非冷却幅Ｄｆを大きくすると、
フランジ部３ヘの冷却水の接触率が小さくなる。またフ
ランジヘの冷却液の接触率が１５％以上になるとウェブ
の冷却に対して、フランジ部の過冷却が問題となってく
る。従って、一つの冷却装置で異なるウェブ幅を冷却す
る場合、常にフランジヘの冷却液の接触率を１５％未満
にするために噴射圧を変更すればよいことが分かる。例
えば非冷却幅Ｄｆが２０mmの場合は、噴射圧を０．５５
kgf/cm2 Ｇ、非冷却幅Ｄｆが５０mmの場合は噴射圧を
０．８８kgf/cm2 Ｇ、非冷却幅Ｄｆが１００mmの場合は
噴射圧を１．２kgf/cm2 Ｇに、それぞれ調整すれば、常
にフランジヘの冷却液の接触率を１５％未満にすること
ができる。As is apparent from FIG. 3, when the injection pressure is increased, the contact ratio of the cooling water to the flange 3 increases. Also, if the direct cooling area where the cooling water is applied at the same injection pressure is separated from the flange portion 3, that is, if the non-cooling width Df is increased,
The contact ratio of the cooling water to the flange 3 is reduced. If the contact ratio of the cooling liquid to the flange is 15% or more, overcooling of the flange portion becomes a problem with respect to cooling of the web. Therefore, when cooling different web widths by one cooling device, it is understood that the injection pressure should be changed so that the contact ratio of the cooling liquid to the flange is always less than 15%. For example, when the uncooled width Df is 20 mm, the injection pressure is set to 0.55
kgf / cm 2 G, the non-case cooling width Df of 50mm the injection pressure 0.88kgf / cm 2 G, the non-case cooling width Df of 100mm the injection pressure 1.2kgf / cm 2 G, adjusted respectively If this is the case, the contact ratio of the coolant to the flange can always be less than 15%.

【００３６】図４のグラフはウェブ部２の下面と多孔板
ノズル１０の上面との距離Ｈを５０mmに設定して、フラ
ンジ部３への冷却水の接触率が１５％未満となる非冷却
幅Ｄｆと噴射圧力の関係を求めた実験結果を示し、縦軸
に噴射圧力を、横軸に非冷却幅Ｄｆをとったものであ
る。FIG. 4 shows a non-cooling width in which the distance H between the lower surface of the web portion 2 and the upper surface of the perforated plate nozzle 10 is set to 50 mm and the contact ratio of the cooling water to the flange portion 3 is less than 15%. An experimental result showing the relationship between Df and the injection pressure is shown, in which the vertical axis represents the injection pressure and the horizontal axis represents the uncooled width Df.

【００３７】図４のグラフから、非冷却幅Ｄｆに応じた
噴射圧力を決定することができる。なお、ここではウェ
ブ部下面と多孔板ノズル上面との距離Ｈを５０mmに設定
した場合を例に挙げて説明したが、それ以外の場合につ
いても同様の手法でデータを取って、最適な条件を決定
することができることは言うまでもない。From the graph of FIG. 4, the injection pressure according to the non-cooling width Df can be determined. Here, the case where the distance H between the lower surface of the web portion and the upper surface of the perforated plate nozzle is set to 50 mm has been described as an example, but in other cases, data is obtained by the same method, and the optimum condition is determined. It goes without saying that the decision can be made.

【００３８】次に、試験例に基づきこの第１実施形態装
置を用いてＵ形鋼矢板を冷却する方法について図１乃至
図５に基づき説明する。Next, a method of cooling a U-shaped sheet pile using the apparatus of the first embodiment will be described with reference to FIGS. 1 to 5 based on test examples.

【００３９】試験例１．ここでは、図１及び図２に示す
冷却装置１１を３台（３ゾーン）用い、これら３台の冷
却装置１１Ａ，１１Ｂ，１１Ｃを、第二中間圧延機１８
と仕上げ圧延機１９の間に直列に配置した。１ゾーン当
たりの冷却装置１１は、長さ５０００mm、幅２２０mm、
高さ１００mmで、多孔板ノズル１０は、φ３mmの噴射孔
１３を９６０個千鳥配列で配置した。冷却装置群の入り
側の先頭部には、なめらかに鋼矢板が挿入されるよう三
角形の案内装置２０を取り付け、冷媒として工業用水を
用いた。そしてウェブ部２の下面と多孔板ノズル１０の
上面との距離Ｈを５０mmに設定して、これら冷却装置群
１１Ａ，１１Ｂ，１１Ｃに、両側爪５，５間の有効幅５
００mm、フランジ高さ２００mm、ウェブ厚さ２４．３mm
の、いわゆる VＬ型といわれるＵ形鋼矢板１を冷却させ
た。 Test Example 1 Here, three cooling devices 11 (three zones) shown in FIGS. 1 and 2 are used, and these three cooling devices 11A, 11B, and 11C are connected to the second intermediate rolling mill 18.
And the finishing mill 19 in series. The cooling device 11 per zone is 5000 mm long, 220 mm wide,
The perforated plate nozzle 10 having a height of 100 mm and 960 injection holes 13 having a diameter of 3 mm was arranged in a staggered arrangement. A triangular guide device 20 was attached to the leading end of the cooling device group on the entry side so that the steel sheet pile was inserted smoothly, and industrial water was used as a refrigerant. Then, the distance H between the lower surface of the web portion 2 and the upper surface of the perforated plate nozzle 10 is set to 50 mm, and the cooling device groups 11A, 11B, and 11C are provided with an effective width 5 between the both-side claws 5 and 5.
00mm, flange height 200mm, web thickness 24.3mm
The U-shaped steel sheet pile 1 referred to as the VL type was cooled.

【００４０】VＬ型Ｕ形鋼矢板１の第二中間圧延機１８
終了時でのウェブ部２の厚さは約２８mm、フランジ厚み
が約１２mm、ウェブ部２の下面側の内法は約２９８mmで
あった。従って、非冷却幅Ｄｆは３９mmで、図４より噴
射圧力は０．８kgf/cm2 Ｇ以下にすればよい。よって、
噴射圧力をここでは０．７kgf/cm2 Ｇに設定し、１ゾー
ン当たりの冷却水量は約４８００リットル/min、３ゾー
ンで約１４４００リットル/minとなるように設定した。
また VＬＵ形鋼矢板１の冷却装置群１１Ａ，１１Ｂ，１
１Ｃ上での搬送速度は１．０ｍ/secに設定した。Second intermediate rolling mill 18 for VL type U-shaped sheet pile 1
At the end, the thickness of the web part 2 was about 28 mm, the thickness of the flange was about 12 mm, and the inner dimension of the lower surface side of the web part 2 was about 298 mm. Therefore, the uncooled width Df is 39 mm, and the injection pressure may be set to 0.8 kgf / cm 2 G or less according to FIG. Therefore,
Here, the injection pressure was set to 0.7 kgf / cm 2 G, and the cooling water amount per zone was set to about 4800 liters / min and to about 14400 liters / min for the three zones.
Also, the cooling device groups 11A, 11B, 1 of the VLU-shaped steel sheet pile 1
The transport speed on 1C was set to 1.0 m / sec.

【００４１】以上の条件で、第二中間圧延機１８終了後
の VＬ型Ｕ形鋼矢板１を冷却させた。第二中間圧延機１
８を終了後のウェブ部２の平均温度は９８６℃、フラン
ジ部３の平均温度は９０５℃で、平均温度差が約８１℃
あった。冷却復熱後、仕上げ圧延機１９前の被圧延材の
ウェブ部２の平均温度は８５２℃、フランジ部３の平均
温度は８４４℃とほぼ同じ温度にすることができた。そ
して仕上げ圧延後、常温まで放冷させた後の２０ｍ当た
りの反り量は、上側に約１２mmであった。Under the above conditions, the VL-shaped U-shaped sheet pile 1 after the completion of the second intermediate rolling mill 18 was cooled. Second intermediate rolling mill 1
8, the average temperature of the web portion 2 is 986 ° C, the average temperature of the flange portion 3 is 905 ° C, and the average temperature difference is about 81 ° C.
there were. After cooling and reheating, the average temperature of the web portion 2 of the material to be rolled before the finish rolling mill 19 was 852 ° C., and the average temperature of the flange portion 3 was almost the same as 844 ° C. After the finish rolling, the amount of warpage per 20 m after cooling to room temperature was about 12 mm on the upper side.

【００４２】このように、この第１実施形態の冷却方法
を用いれば、Ｕ形鋼矢板１のウェブ部２のみを選択的に
効率良く冷却することができる。搬送ライン１５上の第
二中間圧延機１８と仕上げ圧延機１９の間に本冷却方法
を用いた冷却装置１１を設置することで、ウェブ部２と
フランジ部３の温度差を従来の限界を超えて縮めること
ができ、これによって圧延終了後、放冷させて常温にな
っても熱歪みによるＵ形鋼矢板１の変形を防ぐことがで
きる。その結果、搬送におけるトラブルが軽減され生産
効率を上げることができる。As described above, by using the cooling method of the first embodiment, only the web portion 2 of the U-shaped steel sheet pile 1 can be selectively and efficiently cooled. By installing the cooling device 11 using the present cooling method between the second intermediate rolling mill 18 and the finishing rolling mill 19 on the transport line 15, the temperature difference between the web portion 2 and the flange portion 3 exceeds the conventional limit. This allows the U-shaped steel sheet pile 1 to be prevented from being deformed due to thermal strain even after the rolling is completed and allowed to cool to room temperature. As a result, troubles in transport are reduced, and production efficiency can be increased.

【００４３】比較例 図８に示すように第二中間圧延機１８と仕上げ圧延機１
９の間に、フルコーンスプレーノズル６のみを用いた長
さ１５ｍの冷却装置を設置した。フルコーンスプレーノ
ズル６は、搬送ライン１５の長手方向に長い楕円型に冷
却水（工業用水）を噴射するもので、長手方向に９０
度、幅方向に６０度の噴射特性を持っており、ウェブ部
２のみに冷却水を衝突させようとした。またノズル６
は、５００mm間隔で長手方向に合計３０本、搬送ロール
より１５mm下側で、幅方向中央に設置した。また被圧延
材であるＵ形鋼矢板１の下面のウェブ部２の内法は約３
００mmであり、ノズル上面からウェブ下面までの距離が
２００mmなので、幅方向に噴射角６０度の角吹きフルコ
ーンノズルを用いると約２３０mmの有効冷却幅が得ら
れ、フィレット部４には直接冷却水が衝突しない値とな
っている。ノズル一本当たりの水量は１５０リットル/m
inに設定し、３０本で約４５００リットル/min噴射し
た。 Comparative Example As shown in FIG. 8, the second intermediate rolling mill 18 and the finishing rolling mill 1
Between 9, a cooling device with a length of 15 m using only the full cone spray nozzle 6 was installed. The full cone spray nozzle 6 sprays cooling water (industrial water) in an elliptical shape that is long in the longitudinal direction of the transport line 15 and has a 90-degree lengthwise direction.
It has an injection characteristic of 60 degrees in the width and width directions, and an attempt was made to cause the cooling water to collide only with the web portion 2. Nozzle 6
Were installed at the center in the width direction at a pitch of 500 mm, a total of 30 pieces in the longitudinal direction, 15 mm below the transport roll, and in the width direction. The inner diameter of the web portion 2 on the lower surface of the U-shaped sheet pile 1 to be rolled is about 3
Since the distance from the upper surface of the nozzle to the lower surface of the web is 200 mm, an effective cooling width of about 230 mm can be obtained by using a square-blow full cone nozzle having a spray angle of 60 degrees in the width direction. Is a value that does not collide. Water volume per nozzle is 150 liters / m
In was set to in, and about 4500 liters / min was injected with 30 tubes.

【００４４】この比較例の冷却装置に、一般に VＬ型と
いわれるＵ形鋼矢板１を冷却させた。 VＬ型Ｕ形鋼矢板
１の第二中間圧延機１８終了時でのウェブ部２の厚さは
約２８mm、フランジ部３の厚みが約１２mm、ウェブ部２
の下面側の内法は約２９８mmであった。第二中間圧延機
１８を終了後、ウェブ部の平均温度は９８１℃、フラン
ジ部の平均温度は９０３℃で平均温度差が約７７℃あっ
た。この被圧延材を冷却装置上を０．５ｍ/sで搬送させ
た。その結果、仕上げ圧延機１９前の被圧延材のウェブ
部２の平均温度は８５２℃、フランジ部３の平均温度は
７２７℃と、当初７７℃であった平均温度差が１２５℃
と広がった。この原因を検討したところ、ウェブ部２の
みを狙って噴射しているはずの角吹きフルコーンスプレ
ーノズル６の冷却水はウェブ衝突後、ウェブ部２の面を
沿って一部はフランジ部３へ流れ、また一部はウェブ部
２の面から跳水となってフランジ部３へかかり、その結
果、ウェブ部２より薄いフランジ部３の温度が大きく下
がってしまうことが判明した。なお、この被圧延材を仕
上げ圧延後常温まで放冷させたところ、２０ｍ当たり約
１８００mmの上反りが発生し、搬送が困難となった。ち
なみに、冷却処理を施さない有効幅５００mmのＵ形鋼矢
板の場合、圧延終了後常温になると、２０ｍ当たり約１
５００mmの上反りが発生し、同様に搬送が困難となっ
た。In the cooling device of this comparative example, a U-shaped sheet pile 1 generally called a VL type was cooled. At the end of the second intermediate rolling mill 18, the thickness of the web portion 2 of the VL type U-shaped sheet pile 1 is about 28 mm, the thickness of the flange portion 3 is about 12 mm, and the web portion 2
The inner dimension on the lower surface side of was about 298 mm. After finishing the second intermediate rolling mill 18, the average temperature of the web portion was 981 ° C, the average temperature of the flange portion was 903 ° C, and the average temperature difference was about 77 ° C. The material to be rolled was conveyed on a cooling device at 0.5 m / s. As a result, the average temperature of the web portion 2 of the material to be rolled before the finish rolling mill 19 was 852 ° C., the average temperature of the flange portion 3 was 727 ° C., and the average temperature difference of 77 ° C. at the beginning was 125 ° C.
And spread. After examining the cause, the cooling water of the square-blow full cone spray nozzle 6, which should have been spraying aiming only at the web portion 2, partially hit the flange portion 3 along the surface of the web portion 2 after the web collision. It has been found that the flow and part of the water flow from the surface of the web portion 2 as splashing water to the flange portion 3, and as a result, the temperature of the flange portion 3 which is thinner than the web portion 2 drops significantly. When the material to be rolled was allowed to cool to room temperature after the finish rolling, a warpage of about 1800 mm per 20 m occurred, making transport difficult. By the way, in the case of a U-shaped steel sheet pile with an effective width of 500 mm without cooling treatment, when the temperature reaches room temperature after the end of rolling, about 1 per 20 m
An upward warpage of 500 mm occurred, which also made transport difficult.

【００４５】実施形態２．図９は本発明の第２の実施形
態に係るＵ形鋼矢板の冷却方法に用いられる装置の構成
を搬送ライン方向より示す縦断面図であり、Ｕ形鋼矢板
の各部の構成は前述の従来例（図１５）のものと同様で
あるので、同一符号を付してある。また、ここでも冷媒
として工業用水を使用したものを例に挙げて説明する。Embodiment 2 FIG. 9 is a longitudinal sectional view showing a configuration of an apparatus used for a method of cooling a U-shaped steel sheet pile according to the second embodiment of the present invention, as viewed from the direction of a conveying line. Since they are the same as those in the example (FIG. 15), the same reference numerals are given. Also, here, a description will be given using an example in which industrial water is used as a refrigerant.

【００４６】この第２実施形態に係るＵ形鋼矢板の冷却
装置３１は、図９に示すようにヘッダ１２の上面１２Ａ
を、ヘッダ幅方向の中央部１２ａを底とする谷形に形成
して、冷却水噴出方向をウェブ部２の下面に対しウェブ
幅方向の中央側に傾けさせたもので、谷形多孔板ノズル
１０Ａとして構成したものである。The U-shaped sheet pile cooling device 31 according to the second embodiment includes an upper surface 12A of the header 12 as shown in FIG.
Is formed in a valley shape having a bottom at the center portion 12a in the header width direction, and the cooling water ejection direction is inclined toward the center in the web width direction with respect to the lower surface of the web portion 2. 10A.

【００４７】この第２実施形態の冷却方法においても、
非冷却幅Ｄｆと噴射圧力の設定を前述の図４に基づき決
定しているが、更に谷形多孔板ノズル１０Ａを用いて冷
却水噴出方向をウェブ部２の下面に対しウェブ幅方向の
中央側に傾けさせることで、フランジ部３ヘの跳水をよ
り下げることが可能となり、Ｕ形鋼矢板１のフランジ部
３を冷却せずにウェブ部２の下面だけを確実に冷却する
ことができて、冷却後の各部温度差を一層圧縮すること
ができ、平均温度差を従来の限界を超えて縮めることが
できる。In the cooling method according to the second embodiment,
The setting of the non-cooling width Df and the injection pressure is determined based on FIG. 4 described above, and the cooling water jetting direction is further centered in the web width direction with respect to the lower surface of the web portion 2 using the valley-shaped perforated plate nozzle 10A. By inclining the flange portion 3, it is possible to further reduce the water jump to the flange portion 3, and it is possible to reliably cool only the lower surface of the web portion 2 without cooling the flange portion 3 of the U-shaped steel sheet pile 1, The temperature difference of each part after cooling can be further compressed, and the average temperature difference can be reduced beyond the conventional limit.

【００４８】実施形態３．図１０は本発明の第３の実施
形態に係るＵ形鋼矢板の冷却方法に用いられる装置の構
成を搬送ライン方向より示す縦断面図、図１１はその仕
上げ圧延機前でのＵ形鋼矢板の冷却前と冷却復熱後の各
部の温度分布を比較して示すグラフ、図１２は第３の実
施形態の冷却方法により冷却してから仕上げ圧延し終了
させた場合のＵ形鋼矢板の各部の温度分布と冷却せずに
仕上げ圧延まで終了させた場合のＵ形鋼矢板の各部の温
度分布とを比較して示すグラフであり、Ｕ形鋼矢板の各
部の構成は前述の従来例（図１５）のものと同様である
ので、同一符号を付してある。また、ここでも冷媒とし
て工業用水を使用したものを例に挙げて説明する。Embodiment 3 FIG. FIG. 10 is a longitudinal sectional view showing the configuration of an apparatus used for a method of cooling a U-shaped steel sheet pile according to a third embodiment of the present invention, as viewed from the direction of a conveying line. FIG. 11 is a U-shaped sheet pile before the finishing mill. FIG. 12 is a graph showing a comparison between the temperature distribution of each part before cooling and after cooling and reheating, and FIG. 12 shows each part of a U-shaped steel sheet pile in a case where cooling is performed by the cooling method of the third embodiment, and then finish rolling is completed. 5 is a graph showing a comparison between the temperature distribution of the U-shaped steel sheet pile and the temperature distribution of each part of the U-shaped steel sheet pile when cooling to the finish rolling without cooling is performed. 15), the same reference numerals are given. Also, here, a description will be given using an example in which industrial water is used as a refrigerant.

【００４９】この第３実施形態に係るＵ形鋼矢板の冷却
装置４１は、図１０に示すようにヘッダ１２の上面すな
わち多孔板ノズル１０Ｂの幅方向両側部１２ｂ，１２ｃ
における単位面積当たりの噴射孔１３の数をその中央部
１２ａの噴射孔１３の数よりも多くし、これによって単
位面積当たりの噴射孔１３の合計面積が、中央部１２ａ
よりも両側部１２ｂ，１２ｃが大きくなるように設定し
たものである。As shown in FIG. 10, the cooling device 41 for the U-shaped steel sheet pile according to the third embodiment includes an upper surface of the header 12, ie, both side portions 12b, 12c in the width direction of the perforated plate nozzle 10B.
Is larger than the number of the injection holes 13 in the central portion 12a of the central portion 12a, whereby the total area of the injection holes 13 per unit area is reduced in the central portion 12a.
The two sides 12b and 12c are set to be larger than those.

【００５０】この第３実施形態において、多孔板ノズル
１０Ｂより冷却水を噴射させると、多孔板ノズル１０Ｂ
の幅方向両側部１２ｂ，１２ｃから噴射される冷却水の
供給量が中央部１２ａよりも多くなる。その結果、ウェ
ブ下面の冷却水が衝突する直接冷却域内においては、フ
ィレット寄りの両側部が中央部よりも冷却される。図１
１に示すように、逆Ｕ字姿勢に置かれた冷却前のＵ形鋼
矢板１は、フィレット部４の温度が最も高く、ウェブ部
２の中央部ではフィレット部４よりも低くなっている。In the third embodiment, when cooling water is injected from the perforated plate nozzle 10B, the perforated plate nozzle 10B
The supply amount of the cooling water injected from both side portions 12b and 12c in the width direction becomes larger than that of the central portion 12a. As a result, in the direct cooling area where the cooling water on the lower surface of the web collides, both sides closer to the fillet are cooled than the center. FIG.
As shown in FIG. 1, the U-shaped steel sheet pile 1 before cooling placed in the inverted U-shape has the highest temperature of the fillet portion 4 and is lower than the fillet portion 4 at the center of the web portion 2.

【００５１】この第３実施形態の冷却方法においても、
非冷却幅Ｄｆと噴射圧力の設定を前述の図４に基づき決
定しているが、更にウェブ下面に対する冷媒の供給量を
その両側部と中央部とで異ならせ、両側部の供給量を大
きくすることで、図１１に示すウェブ部２の温度勾配に
合わせた冷却が可能となり、冷却後の各部温度差をより
圧縮することができ、平均温度差を従来の限界を超えて
縮めることができる。In the cooling method according to the third embodiment,
Although the setting of the non-cooling width Df and the injection pressure are determined based on FIG. 4 described above, the supply amount of the refrigerant to the lower surface of the web is made different between the both sides and the central portion to increase the supply amount on both sides. Thereby, cooling in accordance with the temperature gradient of the web portion 2 shown in FIG. 11 becomes possible, the temperature difference between the respective portions after cooling can be further compressed, and the average temperature difference can be reduced beyond the conventional limit.

【００５２】次に、試験例に基づきこの第３実施形態装
置を用いてＵ形鋼矢板を冷却する方法について図１０乃
至図１２に基づき説明する。Next, a method for cooling a U-shaped steel sheet pile using the apparatus according to the third embodiment will be described with reference to FIGS. 10 to 12 based on test examples.

【００５３】試験例２．ここでは、図１０に示す冷却装
置４１を３台（３ゾーン）用い、これら３台の冷却装置
を、前述の第１実施形態と同様、第二中間圧延機と仕上
げ圧延機の間に直列に配置した（図５参照）。１ゾーン
当たりの冷却装置４１は、長さ５０００mm、幅２２０m
m、高さ１００mmで、多孔板ノズル１０Ｂは、両側部１
２ｂ，１２ｃの各５５mm幅のエリアが、φ３mmの噴射孔
１３を６４０個均等に配置した強冷却帯として形成さ
れ、中央部１２ａのエリアが、φ３mmの噴射孔１３を３
２０個均等に配置した弱冷却帯として形成され、合計９
６０個の噴射孔１３を形成して構成されている。冷媒と
して工業用水を用い、ウェブ部２の下面と多孔板ノズル
１０Ｂの上面との距離Ｈを５０mmに設定して、これら冷
却装置群４１，４１，４１に、両側爪５，５間の有効幅
５００mm、フランジ高さ２００mm、ウェブ厚さ２４．３
mmの、いわゆる VＬ型といわれるＵ形鋼矢板１を冷却さ
せた。 Test Example 2 Here, three cooling devices 41 (three zones) shown in FIG. 10 are used, and these three cooling devices are connected in series between the second intermediate rolling mill and the finishing rolling mill as in the first embodiment. (See FIG. 5). The cooling device 41 per zone is 5000 mm long and 220 m wide
m, height 100 mm, perforated plate nozzle 10B
The 55 mm wide areas 2b and 12c are each formed as a strong cooling zone in which 640 φ3 mm injection holes 13 are evenly arranged, and the area of the central portion 12a is formed of three φ3 mm injection holes 13.
It is formed as a weak cooling zone evenly arranged in 20 pieces, and a total of 9
It is configured by forming 60 injection holes 13. Using industrial water as a coolant, the distance H between the lower surface of the web portion 2 and the upper surface of the perforated plate nozzle 10B is set to 50 mm, and the cooling device groups 41, 41, 41 are provided with an effective width between both side claws 5, 5. 500mm, flange height 200mm, web thickness 24.3
The U-shaped steel sheet pile 1 of mm, so-called VL type was cooled.

【００５４】VＬ型Ｕ形鋼矢板１の第二中間圧延機終了
時でのウェブ部２の厚さは約２８mm、フランジ厚みが約
１２mm、ウェブ部２の下面側の内法は約２９８mmであっ
た。従って、非冷却幅Ｄｆは３９mmで、図４より噴射圧
力は０．８kgf/cm2 Ｇ以下にすればよい。よって、噴射
圧力をここでは０．７kgf/cm2 Ｇに設定し、１ゾーン当
たりの冷却水量は約４８００リットル/min、３ゾーンで
約１４４００リットル/minとなるように設定した。また
VＬＵ形鋼矢板１の冷却装置群４１，４１，４１上での
搬送速度は１．０ｍ/secに設定した。At the end of the second intermediate rolling mill of the VL-shaped U-shaped sheet pile 1, the thickness of the web portion 2 is about 28 mm, the thickness of the flange is about 12 mm, and the inner diameter of the lower surface side of the web section 2 is about 298 mm. Was. Therefore, the uncooled width Df is 39 mm, and the injection pressure may be set to 0.8 kgf / cm 2 G or less according to FIG. Therefore, the injection pressure was set to 0.7 kgf / cm 2 G here, and the cooling water amount per zone was set to about 4800 liters / min and about 14400 liters / min for the three zones. Also
The transport speed of the VLU-shaped steel sheet pile 1 on the cooling device groups 41, 41, 41 was set to 1.0 m / sec.

【００５５】以上の条件で、第二中間圧延機終了後の V
Ｌ型Ｕ形鋼矢板１を冷却させた。図１１に示すように第
二中間圧延機を終了後のウェブ部２の平均温度は９７８
℃、フランジ部３の平均温度は９１０℃で平均温度差が
約６８℃あった。冷却復熱後、仕上げ圧延機前の被圧延
材のウェブ部２の平均温度は８５８℃、フランジ部３の
平均温度は８５６℃とほぼ同じ温度にすることができ
た。そして仕上げ圧延後、常温まで放冷させた後の２０
ｍ当たりの反り量は、上側に約６mmであった。Under the above conditions, V after completion of the second intermediate rolling mill
The L-shaped U-shaped sheet pile 1 was cooled. As shown in FIG. 11, the average temperature of the web portion 2 after finishing the second intermediate rolling mill is 978.
° C, the average temperature of the flange portion 3 was 910 ° C, and the average temperature difference was about 68 ° C. After cooling and reheating, the average temperature of the web portion 2 of the material to be rolled before the finish rolling mill could be approximately 858 ° C., and the average temperature of the flange portion 3 was approximately 856 ° C. And after finishing rolling, it is allowed to cool to room temperature.
The amount of warpage per m was about 6 mm on the upper side.

【００５６】また、図１２に示すようにこの第３実施形
態の冷却方法を用いて冷却してから仕上げ圧延機を終了
させた後のウェブ部２の平均温度は７２３℃、フランジ
３の平均温度は７１７℃で平均温度差が約６℃であり、
ほぼ同じ温度にすることができた。As shown in FIG. 12, the average temperature of the web portion 2 after cooling using the cooling method of the third embodiment and then terminating the finishing mill is 723 ° C., and the average temperature of the flange 3 Is 717 ° C with an average temperature difference of about 6 ° C,
The temperature could be almost the same.

【００５７】また、図１２には冷却せずに仕上げ圧延機
を終了させた比較例の各部の温度分布も示してある。こ
の比較例の場合、ウェブ部２の平均温度は８１３℃、フ
ランジ部３の平均温度は７６２℃で平均温度差が約５１
℃あり、これを仕上げ圧延後、常温まで放冷させたとこ
ろ、２０ｍ当たり約１５００mmの上反りが発生し、搬送
が困難となった。FIG. 12 also shows the temperature distribution of each part of the comparative example in which the finishing mill was terminated without cooling. In the case of this comparative example, the average temperature of the web portion 2 is 813 ° C., the average temperature of the flange portion 3 is 762 ° C., and the average temperature difference is about 51 ° C.
C., which was allowed to cool down to room temperature after finish rolling. As a result, warpage of about 1500 mm per 20 m occurred, making transport difficult.

【００５８】実施形態４．図１３は本発明の第４の実施
形態に係るＵ形鋼矢板の冷却方法に用いられる装置の構
成を搬送ライン方向より示す縦断面図、図１４は図１３
の異なる態様を示す縦断面図であり、Ｕ形鋼矢板の各部
の構成は前述の従来例（図１５）のものと同様であるの
で、同一符号を付してある。また、ここでも冷媒として
工業用水を使用したものを例に挙げて説明する。Embodiment 4 FIG. FIG. 13 is a longitudinal sectional view showing the configuration of an apparatus used for a method of cooling a U-shaped steel sheet pile according to the fourth embodiment of the present invention, as viewed from the direction of a transport line.
FIG. 16 is a longitudinal sectional view showing a different aspect of the present invention. Since the configuration of each part of the U-shaped steel sheet pile is the same as that of the above-described conventional example (FIG. 15), the same reference numerals are given. Also, here, a description will be given using an example in which industrial water is used as a refrigerant.

【００５９】この第４実施形態に係るＵ形鋼矢板の冷却
装置１１は、図１３及び図１４に示すようにヘッダ１２
のライン幅方向設定位置を可変とするヘッダ位置決め機
構５０を設けたものである。The U-shaped sheet pile cooling device 11 according to the fourth embodiment has a header 12 as shown in FIGS.
Is provided with a header positioning mechanism 50 that makes the set position in the line width direction variable.

【００６０】これを更に詳述すると、ヘッダ位置決め機
構５０は、搬送ライン１５の下方に側方より挿入され
て、支柱５１を介しヘッダ１２を支持するとともに、車
輪５２によって床５３上をライン幅方向に移動可能な可
動体５４と、可動体５４を駆動するアクチュエータ５５
とから構成され、可動体５４を位置決めガイド２２の調
整量ストロークの半分の距離移動させることで、各種幅
のＵ形鋼矢板１Ａ，１Ｂに対するヘッダ１２の心出しを
行う機能を有している。More specifically, the header positioning mechanism 50 is inserted from the side below the transport line 15 to support the header 12 via the support column 51 and to move the wheel 52 on the floor 53 in the line width direction. Movable body 54 and an actuator 55 for driving the movable body 54
The movable body 54 has a function of centering the header 12 with respect to the U-shaped steel sheet piles 1A and 1B of various widths by moving the movable body 54 a distance of a half of the adjustment amount stroke of the positioning guide 22.

【００６１】冷却水供給管は、少なくとも横方向に伸縮
自在なフレキシブル管からなり、ここでは噴出圧力の確
保の容易なテレスコピックパイプを用いている。なお、
５６は位置決めガイド２２を背面側で支持するガイド支
持体、５７はガイド支持体を駆動するアクチュエータで
あり、各種幅のＵ形鋼矢板１Ａ，１Ｂに応じて位置決め
ガイド２２をライン幅方向に移動させることで、各種幅
のＵ形鋼矢板１Ａ，１Ｂの通過ラインの位置決めを行う
機能を有している。The cooling water supply pipe is formed of a flexible pipe which can be expanded and contracted at least in the horizontal direction. Here, a telescopic pipe which can easily secure the ejection pressure is used. In addition,
Reference numeral 56 denotes a guide support that supports the positioning guide 22 on the back side, and reference numeral 57 denotes an actuator that drives the guide support, and moves the positioning guide 22 in the line width direction according to the U-shaped sheet piles 1A and 1B having various widths. This has the function of positioning the passing lines of the U-shaped sheet piles 1A and 1B of various widths.

【００６２】この第４実施形態の冷却方法においても、
非冷却幅Ｄｆと噴射圧力の設定を前述の図４に基づき決
定しているが、更にヘッダ位置決め機構５０によって各
種幅のＵ形鋼矢板１Ａ，１Ｂに対するヘッダ１２の心出
しを行わせることで、幅が異なるＵ形鋼矢板が通っても
対応させることができる。なお、幅が広いＵ形鋼矢板の
場合、被冷却部の非冷却幅Ｄｆが広がって、そのままで
は冷却能力が多少低下することが想定される。この場合
は、非冷却幅Ｄｆが広がった分、噴出圧力を高め、この
噴出圧力により冷却能力を調整する。In the cooling method according to the fourth embodiment,
The setting of the non-cooling width Df and the injection pressure is determined based on FIG. 4 described above. Further, the centering of the header 12 with respect to the U-shaped steel sheet piles 1A and 1B of various widths by the header positioning mechanism 50 is performed. Even if U-shaped steel sheet piles with different widths pass, it can be handled. In the case of a wide U-shaped steel sheet pile, it is assumed that the uncooled width Df of the portion to be cooled is widened and the cooling capacity is slightly reduced as it is. In this case, the ejection pressure is increased by an amount corresponding to the increase of the non-cooling width Df, and the cooling capacity is adjusted by the ejection pressure.

【００６３】なお、前述の各実施形態では本発明の冷却
装置を搬送ライン上の第二中間圧延機と仕上げ圧延機の
間に配置したものを例に挙げて説明した。これは仕上げ
圧延前まで圧延工程が進行した段階では、Ｕ形鋼矢板の
肉厚が薄くなっていて、冷却効果が大きいこと、及び後
段の仕上げ圧延工程にて内部応力がキャンセルされるこ
と、などにより、本発明による効果の検証が容易である
ためである。しかし、本発明は設置位置に限定されるも
のでなく、粗圧延機と第一中間圧延機の間、または第一
中間圧延機と第二中間圧延機の間に配置する場合も含ま
れることは言うまでもない。In each of the above embodiments, the cooling device of the present invention has been described as an example in which the cooling device is disposed between the second intermediate rolling mill and the finishing rolling mill on the transport line. This is because at the stage where the rolling process has progressed before the finish rolling, the thickness of the U-shaped steel sheet pile is thin and the cooling effect is large, and the internal stress is canceled in the subsequent finishing rolling process, etc. This is because the effect of the present invention can be easily verified. However, the present invention is not limited to the installation position, and may include a case where the device is arranged between the rough rolling mill and the first intermediate rolling mill or between the first intermediate rolling mill and the second intermediate rolling mill. Needless to say.

【００６４】[0064]

【発明の効果】以上述べたように、本発明のＵ形鋼矢板
の冷却方法によれば、搬送ライン上を逆Ｕ字姿勢で搬送
されるＵ形鋼矢板のウェブ下面と搬送ライン面との間に
配置した複数の噴射孔より、Ｕ形鋼矢板のフィレットと
冷媒の衝突点との間に所定幅の非冷却部が形成されるよ
うに、かつフランジヘの冷媒の接触率が１５％以下にな
るように噴射圧力または噴射角度を調整して、冷媒を噴
射させるようにしたので、Ｕ形鋼矢板のウェブ部を確実
にフランジ部と同じ温度レベルまで冷却することがで
き、圧延終了後、常温になったときの反り量を大幅に低
減させることができた。その結果、放冷、常温後におい
ては矯正機等の咬み込みが容易となり、矯正効果があが
り、生産性が大幅に向上した。更に拘束装置等の大型設
備が不要となり、かつ連続的に圧延が可能となって、大
幅なコスト低減を実現できた。As described above, according to the method of cooling a U-shaped steel sheet pile of the present invention, the lower surface of the web of the U-shaped steel sheet pile conveyed on the conveying line in an inverted U-shape and the surface of the conveying line. From the plurality of injection holes arranged therebetween, a non-cooled portion having a predetermined width is formed between the fillet of the U-shaped steel sheet pile and the collision point of the refrigerant, and the contact ratio of the refrigerant to the flange is reduced to 15% or less. The injection pressure or the injection angle is adjusted so that the refrigerant is injected, so that the web portion of the U-shaped steel sheet pile can be cooled to the same temperature level as the flange portion without fail. The amount of warpage at the time of was greatly reduced. As a result, after being allowed to cool and at room temperature, biting by a straightening machine or the like became easy, the straightening effect was increased, and the productivity was greatly improved. Further, large-scale equipment such as a restraining device is not required, and continuous rolling is possible, thereby achieving a significant cost reduction.

【００６５】また、この方法に用いられる装置を、逆Ｕ
字姿勢で搬送されるＵ形鋼矢板のウェブ下面と搬送ライ
ン面との間にて、Ｕ形鋼矢板のウェブエリア内に収まる
幅とフランジエリア内に収まる高さに設定されてライン
方向に延びる箱形のヘッダと、ヘッダの上面に形成した
多数の噴射孔と、ヘッダ内に冷媒を供給する冷媒供給管
とから構成したので、ウェブ部の下面と噴射孔との距離
を短縮できて、噴射圧力の調整および噴射冷媒の拡散防
止が容易となり、逆Ｕ字姿勢で搬送されるＵ形鋼矢板の
ウェブ部のみをねらっての冷却が可能となった。The apparatus used in this method is a reverse U
Between the lower surface of the web of the U-shaped sheet pile conveyed in the U-shape and the conveying line surface, the width is set within the web area of the U-shaped sheet pile and the height is set within the flange area and extends in the line direction. Since it is composed of a box-shaped header, a large number of injection holes formed on the upper surface of the header, and a refrigerant supply pipe for supplying refrigerant into the header, the distance between the lower surface of the web portion and the injection holes can be shortened, Adjustment of the pressure and prevention of the diffusion of the injected refrigerant are facilitated, and cooling can be performed by aiming only at the web portion of the U-shaped sheet pile conveyed in the inverted U-shape.

【００６６】また、この方法に用いられる装置におい
て、Ｕ形鋼矢板のフィレットと冷媒の衝突点との間に所
定幅の非冷却部が形成されるように各噴射孔が配置し、
フランジヘの冷媒の接触率が１５％以下になるよう噴射
圧力を調整したので、逆Ｕ字姿勢で搬送されるＵ形鋼矢
板のウェブ部のみをねらっての冷却が容易となった。In the apparatus used in this method, each injection hole is arranged so that a non-cooled portion having a predetermined width is formed between the fillet of the U-shaped steel sheet pile and the collision point of the refrigerant.
Since the injection pressure was adjusted so that the contact ratio of the refrigerant to the flange was 15% or less, cooling was facilitated by aiming only at the web portion of the U-shaped sheet pile conveyed in the inverted U-shape.

【００６７】また、この方法に用いられる装置におい
て、ヘッダ上面の噴射孔形成部分をヘッダ幅方向の中央
部を底とする谷形に形成し、冷媒噴出方向がウェブ面に
対しウェブ幅方向の中央側に傾くように構成したので、
フランジ部ヘの跳水をより下げることが可能となり、逆
Ｕ字姿勢で搬送されるＵ形鋼矢板のフランジ部を冷却せ
ずにウェブ部だけを確実に冷却することができて、冷却
後の各部温度差を一層圧縮することができ、平均温度差
を従来の限界を超えて縮めることができた。In the apparatus used in this method, the injection hole forming portion on the upper surface of the header is formed in a valley shape with the bottom at the center in the header width direction, and the refrigerant ejection direction is centered in the web width direction with respect to the web surface. Because it was configured to tilt to the side,
It is possible to further reduce the water jump to the flange portion, and it is possible to reliably cool only the web portion without cooling the flange portion of the U-shaped sheet pile conveyed in an inverted U-shape, and to cool each portion. The temperature difference could be further compressed, and the average temperature difference could be reduced beyond conventional limits.

【００６８】また、本発明のＵ形鋼矢板の冷却方法によ
れば、逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウェブ下面
の冷媒が衝突する直接冷却域内において、フィレット寄
りの両側部が中央部よりも冷却されるように、ウェブ下
面に対する冷媒の供給量をその両側部と中央部とで異な
らせたので、逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウェ
ブ部の温度勾配に合わせた冷却が可能となった。According to the method for cooling a U-shaped steel sheet pile of the present invention, both sides of the U-shaped steel sheet pile conveyed in the inverted U-shape in the direct cooling area where the refrigerant collides with the refrigerant on the lower surface of the web are formed. Since the supply amount of the refrigerant to the lower surface of the web is made different between the both sides and the central portion so that it is cooled more than the central portion, the temperature gradient of the web portion of the U-shaped steel sheet pile conveyed in the inverted U-shape is reduced. Combined cooling became possible.

【００６９】また、この方法に用いられる装置を、ヘッ
ダ上面の幅方向両側部における単位面積当たりの噴射孔
の合計面積が、ヘッダ上面の幅方向中央部における単位
面積当たりの噴射孔の合計面積よりも大きくなるように
設定したので、逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウ
ェブ部の温度勾配に合わせた冷媒供給量の調整が可能と
なり、これによって冷却後の各部温度差をより圧縮する
ことができた。The total area of the injection holes per unit area at the both sides in the width direction of the upper surface of the header is larger than the total area of the injection holes per unit area at the center in the width direction of the upper surface of the header. Is also set to be large, it is possible to adjust the supply amount of the refrigerant in accordance with the temperature gradient of the web portion of the U-shaped steel sheet pile conveyed in the inverted U-shape, thereby further reducing the temperature difference between the respective portions after cooling. We were able to.

【００７０】また、本発明のＵ形鋼矢板の冷却方法によ
れば、Ｕ形鋼矢板と噴射孔との心出しを行った後、冷媒
を供給するようにしたので、逆Ｕ字姿勢で搬送される各
種幅のＵ形鋼矢板のウェブ部と噴射孔との位置関係が明
確となり、噴射圧力の調整が容易となる。Further, according to the cooling method of the U-shaped steel sheet pile of the present invention, the coolant is supplied after the U-shaped steel sheet pile and the injection hole are centered, so that the conveyance is performed in an inverted U-shape. The positional relationship between the web portion of the U-shaped steel sheet pile having various widths and the injection holes becomes clear, and the adjustment of the injection pressure becomes easy.

【００７１】また、この方法に用いられる装置を、ヘッ
ダのライン幅方向設定位置を可変とするヘッダ位置決め
機構から構成したので、同一ヘッダを各種幅のＵ形鋼矢
板に対応させることができる。Further, since the apparatus used in this method is constituted by a header positioning mechanism which makes the setting position of the header in the line width direction variable, the same header can be adapted to U-shaped sheet piles of various widths.

【００７２】また、この方法に用いられる装置におい
て、搬送ライン上に、Ｕ形鋼矢板の通過ラインの位置決
めを行うガイドを設けたので、Ｕ形鋼矢板と噴射孔との
心出しを簡単に行うことができる。Further, in the apparatus used in this method, since the guide for positioning the passing line of the U-shaped steel sheet pile is provided on the transport line, the centering between the U-shaped steel sheet pile and the injection hole is easily performed. be able to.

【００７３】また、この方法に用いられる装置におい
て、ヘッダの最上流側に、先端を頂点とする平面的にみ
て三角形の案内装置を設けたので、Ｕ形鋼矢板が左右方
向にずれた状態で反搬送されてきた場合でも、Ｕ形鋼矢
板とヘッダとの直接衝突を防止でき、ヘッダを保護する
ことができるとともに、案内装置に衝突したＵ形鋼矢板
を正規の通過ライン位置に導くことができる。Also, in the apparatus used in this method, a triangular guide device is provided on the most upstream side of the header, with the tip being the apex, as viewed in plan, so that the U-shaped sheet pile is shifted in the left-right direction. Even in the case of being conveyed in the opposite direction, a direct collision between the U-shaped steel sheet pile and the header can be prevented, the header can be protected, and the U-shaped steel sheet pile that has collided with the guide device can be guided to a regular passing line position. it can.

【００７４】また、本発明のＵ形鋼矢板の冷却方法によ
れば、冷却を、中間圧延工程と仕上げ圧延工程の間に行
うようにしたので、肉厚が薄くなったＵ形鋼矢板に対す
る冷却効果が大きく、Ｕ形鋼矢板の各部温度の管理が容
易となり、仕上げ圧延終了後、常温になったときの反り
量を大幅に削減することができた。According to the method of cooling a U-shaped sheet pile according to the present invention, the cooling is performed between the intermediate rolling step and the finish rolling step. The effect was large, the temperature of each part of the U-shaped steel sheet pile was easily controlled, and the amount of warpage at the time of normal temperature after the finish rolling was able to be greatly reduced.

【００７５】また、この方法に用いられる装置を、搬送
ライン上の中間圧延機と仕上げ圧延機の間に冷却装置を
配置したので、Ｕ形鋼矢板の各部温度を仕上げ圧延に最
適な温度に調整することができた。Further, since the cooling device is arranged between the intermediate rolling mill and the finishing rolling mill on the conveying line, the temperature of each part of the U-shaped sheet pile is adjusted to the optimum temperature for the finishing rolling. We were able to.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の第１の実施形態に係るＵ形鋼矢板の冷
却方法に用いられる装置の構成を示す斜視図である。FIG. 1 is a perspective view showing a configuration of an apparatus used for a method of cooling a U-shaped steel sheet pile according to a first embodiment of the present invention.

【図２】第１の実施形態に係るＵ形鋼矢板の冷却方法に
用いられる装置を搬送ライン方向より示す縦断面図であ
る。FIG. 2 is a longitudinal sectional view showing an apparatus used for a method of cooling a U-shaped sheet pile according to the first embodiment, as viewed from the direction of a transport line.

【図３】第１の実施形態に係るＵ形鋼矢板の冷却方法に
用いられる装置のノズルの噴射によって生じるフランジ
部への冷媒の接触率を説明するグラフと非冷却幅Ｄｆの
説明図である。FIG. 3 is a graph illustrating a contact ratio of a refrigerant to a flange portion generated by injection of a nozzle of a device used in a method of cooling a U-shaped steel sheet pile according to the first embodiment, and an explanatory diagram of a non-cooling width Df. .

【図４】第１の実施形態に係るＵ形鋼矢板の冷却方法に
おけるフランジ部への冷媒の接触率が１５％未満となる
非冷却幅と噴射圧力の関係を説明するグラフである。FIG. 4 is a graph illustrating the relationship between the non-cooling width and the injection pressure at which the contact ratio of the refrigerant to the flange portion is less than 15% in the method for cooling a U-shaped steel sheet pile according to the first embodiment.

【図５】第１の実施形態に係るＵ形鋼矢板の冷却方法に
用いられる装置を適用した圧延ラインの概略図である。FIG. 5 is a schematic diagram of a rolling line to which an apparatus used for a method of cooling a U-shaped sheet pile according to the first embodiment is applied.

【図６】第１の実施形態に係るＵ形鋼矢板の冷却方法に
用いられる装置の最上流側に設置した案内装置を示す斜
視図である。FIG. 6 is a perspective view showing a guide device installed on the most upstream side of the device used in the method for cooling a U-shaped steel sheet pile according to the first embodiment.

【図７】図６の案内装置の諸元を説明するための斜視図
である。FIG. 7 is a perspective view for explaining the specifications of the guide device of FIG. 6;

【図８】比較例である従来装置を適用した圧延ラインの
概略図である。FIG. 8 is a schematic diagram of a rolling line to which a conventional apparatus as a comparative example is applied.

【図９】本発明の第２の実施形態に係るＵ形鋼矢板の冷
却方法に用いられる装置の構成を搬送ライン方向より示
す縦断面図である。FIG. 9 is a longitudinal sectional view showing a configuration of an apparatus used for a method of cooling a U-shaped sheet pile according to a second embodiment of the present invention, as viewed from the direction of a transport line.

【図１０】本発明の第３の実施形態に係るＵ形鋼矢板の
冷却方法に用いられる装置の構成を搬送ライン方向より
示す縦断面図である。FIG. 10 is a longitudinal sectional view showing a configuration of an apparatus used for a method of cooling a U-shaped steel sheet pile according to a third embodiment of the present invention, as viewed from a conveying line direction.

【図１１】第３の実施形態に係るＵ形鋼矢板の冷却方法
における仕上げ圧延機前でのＵ形鋼矢板の冷却前と冷却
復熱後の各部の温度分布を比較して示すグラフである。FIG. 11 is a graph showing a comparison between the temperature distribution of each part before and after cooling and recuperation of the U-shaped steel sheet pile before the finish rolling mill in the method of cooling the U-shaped steel sheet pile according to the third embodiment. .

【図１２】第３の実施形態に係るＵ形鋼矢板の冷却方法
により冷却してから仕上げ圧延し終了させた場合のＵ形
鋼矢板の各部の温度分布と冷却せずに仕上げ圧延まで終
了させた場合のＵ形鋼矢板の各部の温度分布とを比較し
て示すグラフである。FIG. 12 shows the temperature distribution of each part of the U-shaped steel sheet pile when cooled by the method for cooling a U-shaped steel sheet pile according to the third embodiment and then finished to finish rolling without cooling. It is a graph which shows in comparison with the temperature distribution of each part of a U-shaped steel sheet pile in the case of.

【図１３】本発明の第４の実施形態に係るＵ形鋼矢板の
冷却方法に用いられる装置の構成を搬送ライン方向より
示す縦断面図である。FIG. 13 is a longitudinal sectional view showing a configuration of an apparatus used for a method of cooling a U-shaped steel sheet pile according to a fourth embodiment of the present invention, as viewed from the direction of a transport line.

【図１４】図１３の異なる態様を示す縦断面図である。FIG. 14 is a longitudinal sectional view showing a different mode of FIG. 13;

【図１５】一般的なＵ形鋼矢板の各部分を説明する説明
図である。FIG. 15 is an explanatory diagram illustrating each part of a general U-shaped sheet pile.

【図１６】変態点Ａｒ３以上の温度で仕上がったときの
Ｕ形鋼矢板の曲がりを説明する履歴図である。FIG. 16 is a hysteresis diagram for explaining bending of a U-shaped steel sheet pile when finished at a temperature equal to or higher than a transformation point Ar3.

【図１７】Ｕ形鋼矢板の反りの説明図である。FIG. 17 is an explanatory view of warpage of a U-shaped steel sheet pile.

【図１８】従来のＵ形鋼矢板の冷却方法の一例を説明す
る説明図である。FIG. 18 is an explanatory view illustrating an example of a conventional method for cooling a U-shaped steel sheet pile.

【図１９】従来のＵ形鋼矢板の冷却方法の他の例を説明
する説明図である。FIG. 19 is an explanatory view illustrating another example of a conventional method of cooling a U-shaped steel sheet pile.

【符号の説明】[Explanation of symbols]

１，１Ａ，１Ｂ Ｕ形鋼矢板 ２ ウェブ部 ３ フランジ部 ４ フィレット部 Ｄｆ 非冷却部 １０Ａ 谷形多孔板ノズル １１，１１Ａ，１１Ｂ，１１Ｃ，３１，４１ 冷却装置 １２ 箱形のヘッダ １２Ａ ヘッダ上面 １２ａ ヘッダ上面の中央部 １２ｂ，１２ｃ ヘッダ上面の両側部 １３ 噴射孔 １４，１４Ａ 冷却水供給管（冷媒供給管） １５ 搬送ライン １８ 第二中間圧延機（中間圧延機） １９ 仕上げ圧延機 ２０ 案内装置 ２１ 固定ガイド ２２ 位置決めガイド ５０ ヘッダ位置決め機構 1, 1A, 1B U-shaped steel sheet pile 2 Web part 3 Flange part 4 Fillet part Df Uncooled part 10A Valley-shaped perforated plate nozzle 11, 11A, 11B, 11C, 31, 41 Cooling device 12 Box-shaped header 12A Header upper surface 12a Central part of header upper surface 12b, 12c Both side parts of header upper surface 13 Injection hole 14, 14A Cooling water supply pipe (refrigerant supply pipe) 15 Transport line 18 Second intermediate rolling mill (intermediate rolling mill) 19 Finishing rolling mill 20 Guide device 21 Fixed guide 22 Positioning guide 50 Header positioning mechanism

フロントページの続き (72)発明者 岡本 成夫 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 塚脇 始 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 藤井 幸生 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 Ｆターム(参考） 4E002 AC05 BD07 CA15 CA20 Continued on the front page (72) Inventor Shigeo Okamoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hajime Tsukawaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Stock In-company (72) Inventor Yukio Fujii 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. F-term (reference) 4E002 AC05 BD07 CA15 CA20

Claims (12)

【特許請求の範囲】[Claims] 【請求項１】 搬送ライン上を逆Ｕ字姿勢で搬送される
高温のＵ形鋼矢板のウェブとフランジとの肉厚差により
生じる温度差を縮めるために、ウェブ下面に冷媒を噴射
してウェブ部を冷却するに際し、 逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウェブ下面と搬送
ライン面との間に配置した複数の噴射孔より、Ｕ形鋼矢
板のフィレットと冷媒の衝突点との間に所定幅の非冷却
部が形成されるように、かつフランジヘの冷媒の接触率
が１５％以下になるように噴射圧力または噴射角度を調
整して、冷媒を噴射させることを特徴とするＵ形鋼矢板
の冷却方法。In order to reduce a temperature difference caused by a difference in thickness between a web and a flange of a high-temperature U-shaped sheet pile conveyed on a conveyance line in an inverted U-shape, a refrigerant is injected onto a lower surface of the web to reduce the temperature difference. When cooling the part, a plurality of injection holes arranged between the lower surface of the web of the U-shaped steel sheet pile conveyed in the inverted U-shape and the conveying line surface, the gap between the fillet of the U-shaped steel sheet pile and the collision point of the refrigerant The refrigerant is injected by adjusting the injection pressure or the injection angle so that an uncooled portion having a predetermined width is formed between the two and the contact ratio of the refrigerant to the flange is 15% or less. How to cool section steel sheet piles. 【請求項２】 逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウ
ェブ下面の冷媒が衝突する直接冷却域内において、フィ
レット寄りの両側部が中央部よりも冷却されるように、
ウェブ下面に対する冷媒の供給量をその両側部と中央部
とで異ならせることを特徴とする請求項１記載のＵ形鋼
矢板の冷却方法。2. In the direct cooling area where the refrigerant on the lower surface of the web of the U-shaped steel sheet pile conveyed in the inverted U-shape collides with the coolant, both sides closer to the fillet are cooled than the center.
2. The method of cooling a U-shaped steel sheet pile according to claim 1, wherein the supply amount of the refrigerant to the lower surface of the web is made different between the both sides and the center. 【請求項３】 Ｕ形鋼矢板と噴射孔との心出しを行った
後、冷媒を供給することを特徴とする請求項１又は請求
項２記載のＵ形鋼矢板の冷却方法。3. The method for cooling a U-shaped steel sheet pile according to claim 1, wherein the coolant is supplied after centering the U-shaped steel sheet pile and the injection hole. 【請求項４】 冷却を、中間圧延工程と仕上げ圧延工程
の間に行うことを特徴とする請求項１乃至請求項３のい
ずれかに記載のＵ形鋼矢板の冷却方法。4. The method for cooling a U-shaped steel sheet pile according to claim 1, wherein the cooling is performed between an intermediate rolling step and a finish rolling step. 【請求項５】 搬送ライン上を逆Ｕ字姿勢で搬送される
高温のＵ形鋼矢板のウェブ下面に冷媒を噴射してウェブ
部を下方より冷却する冷却装置であって、 逆Ｕ字姿勢で搬送されるＵ形鋼矢板のウェブ下面と搬送
ライン面との間にて、Ｕ形鋼矢板のウェブエリア内に収
まる幅とフランジエリア内に収まる高さに設定されてラ
イン方向に延びる箱形のヘッダと、 該ヘッダの上面に形成した多数の噴射孔と、 前記ヘッダ内に冷媒を供給する冷媒供給管とから構成さ
れてなることを特徴とするＵ形鋼矢板の冷却装置。5. A cooling device for cooling a web portion from below by injecting a refrigerant to a lower surface of a web of a high-temperature U-shaped sheet pile conveyed in an inverted U-shape on a conveying line, wherein the cooling device has a reverse U-shape. Between the lower surface of the web of the U-shaped sheet pile to be conveyed and the conveying line surface, a box-shaped box extending in the line direction and set to have a width that fits in the web area of the U-shaped steel sheet pile and a height that fits in the flange area. A cooling device for a U-shaped steel sheet pile, comprising: a header; a number of injection holes formed on an upper surface of the header; and a refrigerant supply pipe for supplying a refrigerant into the header. 【請求項６】 Ｕ形鋼矢板のフィレットと冷媒の衝突点
との間に所定幅の非冷却部が形成されるように各噴射孔
を配置し、かつフランジヘの冷媒の接触率が１５％以下
になるよう噴射圧力を調整してなることを特徴とする請
求項５記載のＵ形鋼矢板の冷却装置。6. Each of the injection holes is arranged such that an uncooled portion having a predetermined width is formed between the fillet of the U-shaped steel sheet pile and the collision point of the refrigerant, and the contact ratio of the refrigerant to the flange is 15% or less. The cooling device for a U-shaped steel sheet pile according to claim 5, characterized in that the injection pressure is adjusted so as to be as follows. 【請求項７】 ヘッダ上面の噴射孔形成部分を、ヘッダ
幅方向の中央部を底とする谷形に形成して、冷媒噴出方
向をウェブ面に対しウェブ幅方向の中央側に傾けさせた
ことを特徴とする請求項６記載のＵ形鋼矢板の冷却装
置。7. An injection hole forming portion on an upper surface of a header is formed in a valley shape having a bottom at a central portion in a header width direction, and a refrigerant ejection direction is inclined toward a center side in a web width direction with respect to a web surface. The cooling device for a U-shaped steel sheet pile according to claim 6, characterized in that: 【請求項８】 ヘッダ上面の幅方向両側部における単位
面積当たりの噴射孔の合計面積が、ヘッダ上面の幅方向
中央部における単位面積当たりの噴射孔の合計面積より
も大きくなるように設定したことを特徴とする請求項６
記載のＵ形鋼矢板の冷却装置。8. The total area of the injection holes per unit area on both sides in the width direction of the upper surface of the header is set to be larger than the total area of the injection holes per unit area at the center in the width direction of the upper surface of the header. 7. The method according to claim 6, wherein
A cooling device for a U-shaped sheet pile according to the above description. 【請求項９】 ヘッダのライン幅方向設定位置を可変と
するヘッダ位置決め機構を設けたことを特徴とする請求
項５乃至請求項８のいずれかに記載のＵ形鋼矢板の冷却
装置。9. The cooling device for a U-shaped steel sheet pile according to claim 5, further comprising a header positioning mechanism for changing a set position of the header in the line width direction. 【請求項１０】 搬送ライン上に、Ｕ形鋼矢板の通過ラ
インの位置決めを行うガイドを設けたことを特徴とする
請求項５乃至請求項９のいずれかに記載のＵ形鋼矢板の
冷却装置。10. A cooling device for a U-shaped steel sheet pile according to any one of claims 5 to 9, wherein a guide for positioning a passage line of the U-shaped steel sheet pile is provided on the conveying line. . 【請求項１１】 ヘッダの最上流側に、先端を頂点とす
る平面的にみて三角形の案内装置を設けたことを特徴と
する請求項５乃至請求項１０のいずれかに記載のＵ形鋼
矢板の冷却装置。11. A U-shaped steel sheet pile according to claim 5, wherein a guide device having a triangular shape as viewed from above is provided on the most upstream side of the header. Cooling system. 【請求項１２】 冷却装置を、搬送ライン上の中間圧延
機と仕上げ圧延機の間に配置したことを特徴とする請求
項５乃至請求項１１のいずれかに記載のＵ形鋼矢板の冷
却装置。12. A cooling device for a U-shaped steel sheet pile according to claim 5, wherein the cooling device is disposed between an intermediate rolling mill and a finishing rolling mill on a transport line. .
JP26661998A 1998-09-21 1998-09-21 Method and apparatus for cooling U-shaped sheet pile Expired - Fee Related JP3345776B2 (en)

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JP26661998A JP3345776B2 (en) 1998-09-21 1998-09-21 Method and apparatus for cooling U-shaped sheet pile

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Application Number Priority Date Filing Date Title
JP26661998A JP3345776B2 (en) 1998-09-21 1998-09-21 Method and apparatus for cooling U-shaped sheet pile

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JP3345776B2 JP3345776B2 (en) 2002-11-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104384180A (en) * 2014-10-08 2015-03-04 柳州科尔特锻造机械有限公司 Deformed steel production process
JP2020196049A (en) * 2017-08-23 2020-12-10 Ｊｆｅスチール株式会社 Manufacturing method for hat-shaped steel sheet pile
CN113375531A (en) * 2021-05-14 2021-09-10 南京钢铁股份有限公司 Quenching machine nozzle striking angle measuring tool and manufacturing method and using method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104384180A (en) * 2014-10-08 2015-03-04 柳州科尔特锻造机械有限公司 Deformed steel production process
JP2020196049A (en) * 2017-08-23 2020-12-10 Ｊｆｅスチール株式会社 Manufacturing method for hat-shaped steel sheet pile
JP2020196050A (en) * 2017-08-23 2020-12-10 Ｊｆｅスチール株式会社 Manufacturing facility for hat-shaped steel sheet pile
JP2020199553A (en) * 2017-08-23 2020-12-17 Ｊｆｅスチール株式会社 Method of manufacturing hat-shaped steel sheet pile
CN113375531A (en) * 2021-05-14 2021-09-10 南京钢铁股份有限公司 Quenching machine nozzle striking angle measuring tool and manufacturing method and using method thereof
CN113375531B (en) * 2021-05-14 2023-11-03 南京钢铁股份有限公司 Quenching machine nozzle striking angle measuring tool and manufacturing method and using method thereof

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