JPS6231140B2 - - Google Patents
Info
- Publication number
- JPS6231140B2 JPS6231140B2 JP12573482A JP12573482A JPS6231140B2 JP S6231140 B2 JPS6231140 B2 JP S6231140B2 JP 12573482 A JP12573482 A JP 12573482A JP 12573482 A JP12573482 A JP 12573482A JP S6231140 B2 JPS6231140 B2 JP S6231140B2
- Authority
- JP
- Japan
- Prior art keywords
- extension member
- anchor head
- jack
- anchor
- steel material
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 10
- 239000011513 prestressed concrete Substances 0.000 claims description 4
- 239000004567 concrete Substances 0.000 description 6
- 208000019300 CLIPPERS Diseases 0.000 description 3
- 208000021930 chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids Diseases 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000414 obstructive effect Effects 0.000 description 1
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】
本発明はプレストレストコンクリート内に埋込
まれてこれに緊張を与えているPC鋼材の除去方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing prestressed steel that is embedded in prestressed concrete and exerts tension thereon.
コンクリートは通常圧縮には極めて強い耐力を
有するが、引張強度は小さなものである。そのた
め、コンクリート内に緊張されたPC鋼材(通常
PCストランド、PC鋼線、PC鋼棒などと呼ばれ
ている)を埋込み、コンクリートの優れた圧縮強
度とPC鋼材の強い引張強度との組合せたプレス
トレストコンクリートが実用化されている。ここ
で、これを原子炉の外壁等に用いた場合、PC鋼
材の劣化が起り、定期的にこれを取替える必要が
生じて来る。このPC鋼材は、前述の如く強い力
で緊張されているため、定着を解除すると、瞬時
にシース内へ引き込まれ、周辺を破損するばかり
か極めて危険でもあつた。 Concrete usually has extremely high compression strength, but low tensile strength. Therefore, tensioned prestressing steel (usually
Prestressed concrete, which combines the excellent compressive strength of concrete and the strong tensile strength of prestressed steel, has been put into practical use. If this is used for the outer walls of a nuclear reactor, etc., the PC steel material will deteriorate and it will be necessary to periodically replace it. As mentioned above, this PC steel material is under tension with a strong force, so when it is unfixed, it is instantly drawn into the sheath, which not only damages the surrounding area but is also extremely dangerous.
本発明はこれらの欠点を除去し、安全にPC鋼
材の交換を行うためのPC鋼材の除去方法を提供
するものであつて、その要旨とするところは緊張
されたPC鋼材を保持しているアンカーヘツド
に、外周に該アンカーヘツドと同一のネジが切ら
れた中空筒状の延長部材を、両者のネジ山を整合
させて連続配置に当接させるとともに、棒状の緊
定部材を該延長部材に貫通させてその先端を前記
アンカーヘツドに螺合させて該延長部材をアンカ
ーヘツドに固着し、この延長部材にラムを引いた
状態のジヤツキをセツトし、アンカーナツトをジ
ヤツキの1ストローク分ゆるめて移動させ、次い
でジヤツキのラムを戻し、ジヤツキのセツトを解
き、改めてラムを引いた状態で延長部材をセツト
して以下順次前述の作業を繰り返すことにより
PC鋼材の緊張を解いてからPC鋼材を引抜くこと
を特徴とするPC鋼材の除去方法に存する。以下
図面に示す実施例に従つて詳細に説明する。 The present invention eliminates these drawbacks and provides a method for removing prestressed steel material for safe replacement of the prestressed steel material. A hollow cylindrical extension member with the same threads cut on the outer periphery as the anchor head is brought into contact with the head in a continuous arrangement with the threads of both aligned, and a rod-shaped tensioning member is attached to the extension member. The extension member is fixed to the anchor head by screwing its tip into the anchor head, and a jack with the ram pulled is set on the extension member, and the anchor nut is loosened by one stroke of the jack and moved. Then, return the jack ram, unset the jack, pull the ram again, set the extension member, and repeat the above steps in sequence.
The present invention resides in a method for removing a prestressed steel material, which is characterized by releasing the tension in the prestressed steel material and then pulling out the prestressed steel material. Embodiments will be described in detail below according to embodiments shown in the drawings.
第1図は本発明の一実施例を説明するための部
分断面図である。同図に於て、1はコンクリート
であつて、シース11が埋込まれており、このシ
ース11内にはPCストランド12が挿入されて
いる。2はこのPCストランド12に与えられた
緊張を支承しているアンカーで、シース11の先
端に取付けられたアンカープレート21、コーン
孔22に挿入されたクリツパー23によつてPC
ストランド12を保持するアンカーヘツド24お
よびこのアンカーヘツド24を前記アンカープレ
ート21で支承させるためのアンカーナツト25
とによつて構成されている。即ち、PCストラン
ド12に与えられた緊張力は、クリツパー23を
介してアンカーヘツド24へ伝達され、アンカー
ナツト25によつてアンカープレート21で支承
され、コンクリート1に伝えられる。これによつ
てコンクリート1は圧縮のみではなく、引張に対
しても充分な強度を持つようになる。 FIG. 1 is a partial sectional view for explaining one embodiment of the present invention. In the figure, 1 is concrete, in which a sheath 11 is embedded, and a PC strand 12 is inserted into this sheath 11. Reference numeral 2 denotes an anchor that supports the tension applied to the PC strand 12, and the anchor plate 21 attached to the tip of the sheath 11 and the clipper 23 inserted into the cone hole 22 are used to tighten the PC strand.
An anchor head 24 for holding the strand 12 and an anchor nut 25 for supporting the anchor head 24 on the anchor plate 21.
It is composed of: That is, the tension applied to the PC strand 12 is transmitted to the anchor head 24 via the clipper 23, supported by the anchor plate 21 by the anchor nut 25, and transmitted to the concrete 1. This allows the concrete 1 to have sufficient strength not only in compression but also in tension.
3は延長パイプ31、緊締プレート32および
緊締部材33等によつて構成されている延長部材
である。この延長パイプ31はその外周全面にわ
たつて前記アンカーヘツド24の外周面のものと
同一のネジが切られており、その長さLはPCス
トランド12が緊張によつて延びた長さに応じて
定められている。緊締プレート32はアンカーヘ
ツド24のコーン孔22に対応した透孔があけら
れた延長パイプ31の外径より若干小さく、内径
より大きな直径を有する円形プレートであり、緊
締部材33はこの緊締プレート32にあけられた
透孔に挿入される。 Reference numeral 3 denotes an extension member composed of an extension pipe 31, a tightening plate 32, a tightening member 33, and the like. This extension pipe 31 has the same thread as that on the outer circumference of the anchor head 24 over its entire outer circumference, and its length L corresponds to the length of the PC strand 12 extended by tension. It is determined. The tightening plate 32 is a circular plate having a diameter slightly smaller than the outer diameter and larger than the inner diameter of the extension pipe 31, which has a through hole corresponding to the cone hole 22 of the anchor head 24, and the tightening member 33 is attached to this tightening plate 32. It is inserted into the drilled hole.
緊締部材33はその一方Bの端部に前記緊締プ
レート32の透孔に係止されるフランジ34を備
えており、他方の端部はその外周にアンカーヘツ
ド24のコーン孔22に切られたネジ26に螺合
するネジ35が切られており、端面よりPCスト
ランド12の端部が嵌入するめくら孔36があけ
られている。4はこの様な延長部材3の延長パイ
プ31とアンカーヘツド24とのネジ山を整合さ
せるための補助ナツトである。 The tightening member 33 is provided with a flange 34 at one end B thereof, which is engaged with the through hole of the tightening plate 32, and the other end is provided with a screw cut into the cone hole 22 of the anchor head 24 on its outer periphery. A screw 35 is cut to be screwed into the PC strand 26, and a blind hole 36 into which the end of the PC strand 12 is inserted is opened from the end surface. 4 is an auxiliary nut for aligning the threads of the extension pipe 31 of the extension member 3 and the anchor head 24.
以下PCストランド12の除去について順を追
つて説明する。 The removal of the PC strand 12 will be explained step by step below.
第2図は本発明の一実施例のプロセスを示すも
のである。先ず、アンカーヘツド24の頭部に補
助ナツト4を螺合させる。第2図1はこの状態を
示している。この時、補助ナツト4は完全に螺合
してしまわず、多少の余裕を残しておき、ここに
延長パイプ31をネジ込む。このネジ込みを完全
に行なうとアンカーヘツド24と延長パイプ31
のネジ山は整合する。第2図2はこの状態を示し
ている。次いで緊締部材33を緊締プレート32
に挿通し、延長パイプ31内に挿入してその先端
のネジ35をコーン孔22のネジ26にネジ込ん
で締付け、延長パイプ31をアンカーヘツド24
に固着する。第2図3はこの状態を示している。
延長部材3のアンカーヘツド24への固着が完了
すると補助ナツト4は除去される。第2図4はこ
の状態を示している。 FIG. 2 shows the process of one embodiment of the present invention. First, the auxiliary nut 4 is screwed onto the head of the anchor head 24. FIG. 2 1 shows this state. At this time, the auxiliary nut 4 is not completely screwed together, leaving some margin, and the extension pipe 31 is screwed into this. When this screw is completely screwed in, the anchor head 24 and extension pipe 31
The threads of the screws are aligned. FIG. 2 shows this state. Next, the tightening member 33 is attached to the tightening plate 32.
, insert it into the extension pipe 31 , screw the screw 35 at the tip into the screw 26 of the cone hole 22 and tighten, and then attach the extension pipe 31 to the anchor head 24 .
sticks to. FIG. 2 shows this state.
Once the extension member 3 has been secured to the anchor head 24, the auxiliary nut 4 is removed. FIG. 24 shows this state.
この様にしてアンカーヘツド24に延長部材3
が固着されると、延長部材3にジヤツキ5がセツ
トされる。第2図5はこの状態を示すものであつ
て、51はジヤツキ本体、52はジヤツキチエ
ア、53はラムを示している。延長部材3へのジ
ヤツキ5のセツトは図示の如くラム53を引いた
状態で行われる。次いで、ラム53をさらに引い
て、アンカーナツト25にかかつている力を除
き、このアンカーナツト25を廻して、ジヤツキ
5のストロークに応じて移動させる。第2図6は
この状態を示す。ここで、ジヤツキ5のラム53
を戻すとアンカーヘツド24と延長部材3の先端
部はアンカーナツト25がアンカープレートに接
するまでシース11内に引込まれる。第2図7は
この状態を示している。ここで、ジヤツキ5のセ
ツトを一旦解除して、ラム53引き、その状態で
再度セツトする。第2図8はその状態を示すもの
である。以後は第3図5以下で説明したプロセス
を逐次繰返してPCストランド12の緊張を完全
に解く。緊張が解かれたPCストランド12はア
ンカーナツト25を外して引抜かれる。 In this way, the extension member 3 is attached to the anchor head 24.
Once it is fixed, the jack 5 is set on the extension member 3. FIG. 2 5 shows this state, with reference numeral 51 the jack body, 52 the jack air, and 53 the ram. The setting of the jack 5 on the extension member 3 is carried out with the ram 53 being pulled as shown. Next, the ram 53 is further pulled to remove the force applied to the anchor nut 25, and the anchor nut 25 is rotated and moved in accordance with the stroke of the jack 5. FIG. 26 shows this state. Here, ram 53 of Jacki 5
When the anchor head 24 and the distal end of the extension member 3 are returned, the anchor head 24 and the distal end of the extension member 3 are drawn into the sheath 11 until the anchor nut 25 contacts the anchor plate. FIG. 27 shows this state. Here, the setting of the jack 5 is temporarily released, the ram 53 is pulled, and in this state, the jack 5 is set again. FIG. 28 shows this state. Thereafter, the tension in the PC strand 12 is completely released by repeating the process described in FIG. 3 and subsequent figures. The tensioned PC strand 12 is pulled out by removing the anchor nut 25.
以上の如く、本発明のPC鋼材除去方法によれ
ば、PC鋼材の緊張をジヤツキを用いて徐々に解
除してゆくものであるため、PC鋼材が瞬時にシ
ース内へ引込まれて周辺を破損することもなく極
めて安全にPC鋼材の除去が行なえる。さらに、
本発明の工法によれば、延長部材を接続してPC
鋼材の緊張をゆるめてゆくものであるため、緊張
時に延びたPC鋼材をそのまま残しておかなくて
も緊張の解除が可能であるため、PC鋼材の定着
部分が小さくでき、邪魔な突出部が無くなり安全
対策の上からも有利となるばかりか、キヤツプ等
の部材も安価なものでよくなる。 As described above, according to the prestressing steel material removal method of the present invention, since the tension in the prestressing steel material is gradually released using a jack, the prestressing steel material is instantly drawn into the sheath and the surrounding area is damaged. PC steel material can be removed extremely safely without any problems. moreover,
According to the construction method of the present invention, the extension member is connected to the PC.
Since the tension in the steel material is loosened, the tension can be released without leaving the prestressed steel material that has elongated during tension, so the anchoring part of the prestressed steel material can be made smaller and there are no obstructive protrusions. Not only is this advantageous from a safety standpoint, but the cap and other components can be made from inexpensive materials.
以上、図面に示す実施例によつて詳細に説明し
たが、本発明はこれにのみ限定されるものでない
ことはいうまでもない。例えば、延長パイプも外
径がアンカーヘツドの外径と等しく、相互のネジ
も同一のものであれば特にパイプにのみこだわる
ものではなく、鋼棒に緊張部材の通る孔をあけた
もの等種々のバリエーシヨンが考えられる。 Although the embodiments shown in the drawings have been described in detail above, it goes without saying that the present invention is not limited thereto. For example, as long as the outer diameter of the extension pipe is the same as the outer diameter of the anchor head, and the mutual threads are the same, we are not limited to just pipes; we can also use various types of extension pipes, such as steel rods with holes drilled through them for tension members. Variations are possible.
また、緊締部材もフランジの代りにネジを切つ
ておきナツトで締付けらもの、あるにはPC鋼棒
とナツト等で直接接続するもの等種々のバリエー
シヨンが考えられる。さらに、アンカーナツトの
高さがアンカーヘツドよりも高く形成できれば、
補助ナツトは不要となる。これら種々のバリエー
シヨンによつても前記実施例と同等の効果を期待
できる。 In addition, various variations are conceivable for the tightening member, such as one in which the tightening member is threaded and tightened with a nut instead of a flange, and one in which the tightening member is directly connected to the PC steel bar with a nut. Furthermore, if the height of the anchor nut can be formed higher than the anchor head,
Auxiliary nuts are not required. Even with these various variations, effects equivalent to those of the above embodiment can be expected.
第1図は本発明の一実施例を示す部分断面図、
第2図はそのプロセスを説明するための図であ
る。
1……コンクリー、ト11……シース、12…
…PCストランド、2……アンカー、21……ア
ンカープレート、22……コーン孔、23……ク
リツパー、24……アンカーヘツド、25……ア
ンカーナツト、26……ネジ、3……延長部材、
31……延長パイプ、32……緊締プレート、3
3……緊締部材、34……フランジ、35……ネ
ジ、36……めくら穴、4……補助ナツト、5…
…ジヤツキ、51……ジヤツキ本体、52……ジ
ヤツキチエア、53……ラム。
FIG. 1 is a partial sectional view showing an embodiment of the present invention;
FIG. 2 is a diagram for explaining the process. 1... Concrete, 11... Sheath, 12...
... PC strand, 2 ... anchor, 21 ... anchor plate, 22 ... cone hole, 23 ... clipper, 24 ... anchor head, 25 ... anchor nut, 26 ... screw, 3 ... extension member,
31...Extension pipe, 32...Tightening plate, 3
3...Tightening member, 34...Flange, 35...Screw, 36...Blind hole, 4...Auxiliary nut, 5...
... Jyatsuki, 51... Jyatsuki main body, 52... Jyatsuki Chi Air, 53... Ram.
Claims (1)
き取るPC鋼材除去方法において、緊張されたPC
鋼材を保持しているアンカーヘツドに、外周に該
アンカーヘツドと同一のネジが切られた中空筒状
の延長部材を、両者のネジ山を整合させて連続配
置に当接させるとともに、棒状の緊定部材を該延
長部材に貫通させてその先端を前記アンカーヘツ
ドに螺合させて該延長部材をアンカーヘツドに固
着し、この延長部材にラムを引いた上端のジヤツ
キをセツトし、アンカーナツトをジヤツキの1ス
トローク分ゆるめて移動させ、次いでジヤツキの
ラムを戻し、ジヤツキのセツトを解き、改めてラ
ムを引いた状態で延長部材をセツトして以下順次
前述の作業を繰り返すことによりPC鋼材の緊張
を解き、PC鋼材を引抜く事を特徴とするPC鋼材
の除去方法。 2 アンカーヘツドに延長部材を固着する際、ア
ンカーヘツドに予め補助ナツトを螺合させ、この
補助ナツトの逆側より延長部材をネジ込むことに
より両者ネジ山を整合させることを特徴とする特
許請求の範囲第1項記載のPC鋼材の除去方法。[Claims] 1. In a method for removing prestressed concrete from prestressed concrete, tensed PC
A hollow cylindrical extension member, which has the same threads cut on the outer periphery as the anchor head, is brought into contact with the anchor head holding the steel material in a continuous arrangement with the threads of both parts aligned, and a rod-shaped tension member is attached. A fixed member is passed through the extension member and its tip is screwed into the anchor head to fix the extension member to the anchor head. A jack at the upper end with a ram is set on the extension member, and the anchor nut is tightened. Loosen the jack by one stroke and move it, then return the jack ram, unset the jack, pull the ram again, set the extension member, and repeat the above steps in order to release the tension in the PC steel. , a method for removing prestressed steel material, which is characterized by pulling out the prestressed steel material. 2. When fixing the extension member to the anchor head, an auxiliary nut is screwed onto the anchor head in advance, and the extension member is screwed in from the opposite side of the auxiliary nut to align the threads of both. A method for removing prestressing steel materials as described in Scope 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12573482A JPS5918857A (en) | 1982-07-21 | 1982-07-21 | Removal of pc steel material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12573482A JPS5918857A (en) | 1982-07-21 | 1982-07-21 | Removal of pc steel material |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5918857A JPS5918857A (en) | 1984-01-31 |
JPS6231140B2 true JPS6231140B2 (en) | 1987-07-07 |
Family
ID=14917464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12573482A Granted JPS5918857A (en) | 1982-07-21 | 1982-07-21 | Removal of pc steel material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5918857A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01111779U (en) * | 1988-01-13 | 1989-07-27 | ||
JPH03206208A (en) * | 1989-12-29 | 1991-09-09 | Konpojitsuto Syst Kenkyusho:Kk | Trough for water channel |
JPH0419066Y2 (en) * | 1987-11-06 | 1992-04-28 | ||
JPH0476297B2 (en) * | 1987-09-03 | 1992-12-03 | Shimizu Construction Co Ltd |
-
1982
- 1982-07-21 JP JP12573482A patent/JPS5918857A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0476297B2 (en) * | 1987-09-03 | 1992-12-03 | Shimizu Construction Co Ltd | |
JPH0419066Y2 (en) * | 1987-11-06 | 1992-04-28 | ||
JPH01111779U (en) * | 1988-01-13 | 1989-07-27 | ||
JPH03206208A (en) * | 1989-12-29 | 1991-09-09 | Konpojitsuto Syst Kenkyusho:Kk | Trough for water channel |
Also Published As
Publication number | Publication date |
---|---|
JPS5918857A (en) | 1984-01-31 |
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