JPH1143938A - Steel pipe pile connection part - Google Patents
Steel pipe pile connection partInfo
- Publication number
- JPH1143938A JPH1143938A JP20295197A JP20295197A JPH1143938A JP H1143938 A JPH1143938 A JP H1143938A JP 20295197 A JP20295197 A JP 20295197A JP 20295197 A JP20295197 A JP 20295197A JP H1143938 A JPH1143938 A JP H1143938A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- pipe pile
- screw
- thread
- screw part
- 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.)
- Pending
Links
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、鋼管杭の連結部に
関し、詳しくは、上下に連結する一方の鋼管杭の一端部
に螺設された雌ネジ部と、他方の鋼管杭の他端部に螺設
された雄ネジ部とを螺合して連結する連結ネジ部を備え
た鋼管杭の連結部に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting portion of a steel pipe pile, and more particularly, to a female screw portion screwed at one end of one steel pipe pile connected vertically and another end of the other steel pipe pile. The present invention relates to a connecting portion of a steel pipe pile provided with a connecting screw portion for screwing and connecting a male screw portion screwed to the steel pipe pile.
【0002】[0002]
【従来の技術】従来、鋼管杭の連結部においては、図3
に示すように、地中に建て込む下方の鋼管杭1の上側に
位置する他端部の連結ネジ部4に1条山形平行雌ネジを
螺設した雌ネジ部5を備える一端側連結部8を形成し
て、前記建て込んだ下方の鋼管杭1に継杭する上方の鋼
管杭1の下側に位置する他端部の連結ネジ部4に1条山
形平行雄ネジを螺設した雄ネジ部6を備える他端側連結
部9を形成し、前記下方の鋼管杭1の上方から、前記上
方の鋼管杭1を吊り降ろして軸芯回りに回転させ、前記
雌ネジ部5に前記雄ネジ部6を螺合させて、上下の鋼管
杭1同士を連結することが行われている。2. Description of the Related Art Conventionally, in a connection portion of a steel pipe pile, FIG.
As shown in FIG. 1, one end side connecting portion 8 provided with a female screw portion 5 in which a single angle parallel female screw is screwed into a connecting screw portion 4 at the other end located above the lower steel pipe pile 1 to be built in the ground. And a single thread angle parallel male screw is screwed into the connection screw part 4 at the other end located below the upper steel pipe pile 1 to be connected to the lower steel pipe pile 1 that has been erected. A lower end side connecting portion 9 including a portion 6 is formed, and the upper steel pipe pile 1 is suspended from above the lower steel pipe pile 1 and rotated around an axis. The upper and lower steel pipe piles 1 are connected by screwing the portions 6 together.
【0003】[0003]
【発明が解決しようとする課題】上記従来の鋼管杭の連
結部においては、前記連結ネジ部4を平行ネジで形成し
てあるために、吊り降ろした際に、前後左右に振れるこ
とから、前記上方から連結する鋼管杭1を前記下方の鋼
管杭1の軸心に位置合わせすることが困難であり、位置
合わせのための手作業の量が多く、作業の安全上の問題
を有すると同時に、前記上方の鋼管杭1を軸芯回りに回
転させる回転回数が多くなり、作業能率を損ねていると
いう問題を有している。また、上記鋼管杭は、地滑り防
止が主たる用途であり、継杭されて建て込まれた鋼管杭
には、土圧が作用して、曲げ外力を打設後の鋼管杭に及
ぼすようになる。上記従来の連結ネジ部4に関しては、
この曲げ外力は、前記連結ネジ部4を連結した際に、他
端側連結部9の雄ネジ部6の基端部9aに対して一端側
連結部8の先端部8bを充分に押圧して連結していなけ
れば、前記下方の鋼管杭1の一端側連結部8に対して、
上方の鋼管杭1の他端側連結部9に形成してある雄ネジ
部6を前記一端側連結部8の雌ネジ部5に嵌入してある
から、前記一端側連結部8の内面側から曲げ力を前記雌
ネジ部5に及ぼすことになる。その結果、前記一端側連
結部8の先端部8bには、拡管するような変形をもたら
すことになる。これは、前記雌ネジ部5の山と前記雄ネ
ジ部6の谷との間、及び前記雄ネジ部6の山と前記雌ネ
ジ部5の谷との間には隙間があるために、半径方向には
前記雌ネジ部5と前記雄ネジ部6との間の相対偏位を許
容するからである。しかも、前記連結した鋼管杭に曲げ
外力が作用した場合には、曲げの内側(以下、圧縮側と
称する。)には軸方向の圧縮力が作用し、外側(以下、
引張り側と称する。)には軸方向の引張り力が作用する
が、前記連結ネジ部でこの引張り力に対する反力を生ず
るのは、前記雄ネジ部6及び前記雌ネジ部5夫々の接当
するネジ面の間である。この接当するネジ面は前記雄ネ
ジ部6及び前記雌ネジ部5夫々のネジ山の基端部側のネ
ジ面であり、前記連結してある鋼管杭1同士が引張り側
で相互に離間し合うようになる。これは、圧縮側でのネ
ジ面間の面圧力に対する反力によって助長される。その
結果、前記引張り側で雄ネジ部6の接当するネジ面に沿
って雌ネジ部5のネジ面が誘導され、前記基端部9aに
対して前記先端部8bを充分に押圧して連結していなけ
れば、前記雌ネジ部5の引張り側が前記雄ネジ部6から
離間する方向に変形するようになる。このように前記雄
ネジ部6と前記雌ネジ部5とが離間すれば、引張り側の
曲げ耐力への寄与は期待できなくなる。In the connection portion of the conventional steel pipe pile, since the connection screw portion 4 is formed by parallel screws, the connection portion 4 swings back and forth and right and left when it is lowered. It is difficult to align the steel pipe piles 1 connected from above with the axis of the steel pipe piles 1 below, and the amount of manual work for alignment is large, and there is a problem in work safety. There is a problem that the number of rotations of rotating the upper steel pipe pile 1 around the axis increases, thereby impairing work efficiency. The above-mentioned steel pipe piles are mainly used for prevention of landslide, and an earth pressure acts on the steel pipe piles that are connected and built, and an external bending force is exerted on the steel pipe piles after the casting. Regarding the conventional connection screw portion 4 described above,
This bending external force sufficiently presses the distal end portion 8b of the one end side connection portion 8 against the base end portion 9a of the male screw portion 6 of the other end side connection portion 9 when the connection screw portion 4 is connected. If not connected, with respect to one end side connection portion 8 of the lower steel pipe pile 1,
Since the male screw portion 6 formed on the other end side connection portion 9 of the upper steel pipe pile 1 is fitted into the female screw portion 5 of the one end side connection portion 8, from the inner side of the one end side connection portion 8. A bending force is exerted on the female screw portion 5. As a result, the distal end portion 8b of the one end side connecting portion 8 is deformed so as to expand. This is because there is a gap between the crest of the female screw portion 5 and the trough of the male screw portion 6 and a crevice between the crest of the male screw portion 6 and the trough of the female screw portion 5. This is because a relative deviation between the female screw portion 5 and the male screw portion 6 is allowed in the direction. Moreover, when an external bending force acts on the connected steel pipe pile, an axial compressive force acts on the inside (hereinafter, referred to as a compression side) of the bend, and the outside (hereinafter, referred to as a compression side).
Called the pull side. ) Is subjected to a tensile force in the axial direction. However, a reaction force against the tensile force is generated in the connecting screw portion between the male screw portion 6 and the female screw portion 5 in contact with each other. is there. The screw surface to be contacted is a screw surface on the base end side of the thread of each of the male screw portion 6 and the female screw portion 5, and the connected steel pipe piles 1 are separated from each other on the tension side. It will fit. This is facilitated by the reaction force against the surface pressure between the screw surfaces on the compression side. As a result, the screw surface of the female screw portion 5 is guided along the screw surface of the male screw portion 6 on the pulling side, and the distal end portion 8b is sufficiently pressed against the base end portion 9a to be connected. If not, the tension side of the female screw portion 5 is deformed in a direction away from the male screw portion 6. If the male screw portion 6 and the female screw portion 5 are separated from each other in this manner, the contribution to the bending strength on the pulling side cannot be expected.
【0004】上記問題の解決の手段として、図4に示す
ように、連結ネジ部4をテーパネジで構成するととも
に、一方の鋼管杭1の一端側に螺設した雄ネジ部6の基
端部にショルダ部1bを設けて、他方の鋼管杭1の他端
側に螺設した雌ネジ部5の先端部の端面1cを接当させ
るように構成することが提案されている(特開平7−8
2738号公報参照)。しかしながら、上記提案による
連結ネジ部4において、前記テーパネジを充分に締め込
んだ状態において、前記端面1cが充分な面圧力を以て
前記ショルダ部1bに接当すれば、曲げ耐力を増強する
ことは可能であるが、前記連結ネジ部4がテーパネジで
構成されている以上、前記テーパネジの加工精度が極め
て高くない限り、その締め込みには限界があり、ネジ山
がネジ谷の底に接するまで締め込んでも前記ショルダ部
1bに前記端面1cが接当するには到らない場合もあ
り、また、前記端面1cが前記ショルダ部1bに接当し
ても前記テーパネジが充分に噛み合っていない場合もあ
る。このようにネジが充分に噛み合っていない状態でさ
らに締め込むと、ネジ山を潰すおそれがある。また、前
者のように、前記ショルダ部1bに前記端面1cが接当
しない場合には、上記従来の連結部と同様の問題を生ず
る上に、前記雄ネジ部6、前記雌ネジ部5共に先端部が
基端部よりも薄肉に形成されているために、上記のよう
な雌ネジ部5の先端部の変形に対する耐力が低下するこ
とは避けられず、上述のような引張り側における雌ネジ
部5の先端部が拡管されるような変形はさらに助長され
る。従って、前記連結ネジ部4において、通常の加工精
度のもとでは、前記雄ネジ部6と前記雌ネジ部5との力
学的な一体化を期待することが困難であり、曲げ耐力の
低下を避けることは容易でないという問題を有してい
る。仮に前記雄ネジ部6と前記雌ネジ部5とを力学的に
一体化可能な程度に前記テーパネジの加工精度を高めよ
うとすれば、ネジ切り加工に要する時間及びコストが非
常に高くなるという問題が生ずる。As a means for solving the above-mentioned problem, as shown in FIG. 4, the connecting screw portion 4 is formed of a tapered screw, and the male screw portion 6 screwed to one end of one of the steel pipe piles 1 is provided at the base end thereof. It has been proposed that a shoulder portion 1b is provided so that an end surface 1c of a distal end portion of a female screw portion 5 screwed to the other end side of the other steel pipe pile 1 is brought into contact with the steel pipe pile 1 (Japanese Patent Laid-Open No. 7-8).
2738). However, in the connection screw portion 4 proposed above, if the end surface 1c abuts on the shoulder portion 1b with a sufficient surface pressure in a state where the taper screw is sufficiently tightened, it is possible to increase the bending strength. However, as long as the connection screw portion 4 is formed of a tapered screw, the tightening of the tapered screw is limited unless the processing accuracy of the tapered screw is extremely high. The end face 1c may not reach the shoulder 1b in some cases, or the tapered screw may not sufficiently engage even if the end face 1c contacts the shoulder 1b. If the screw is further tightened in a state where the screw is not sufficiently engaged, the screw thread may be crushed. If the end face 1c does not contact the shoulder 1b as in the former case, the same problem as that of the conventional connecting portion occurs, and the male screw portion 6 and the female screw portion 5 have both ends. Since the portion is formed thinner than the base end portion, it is inevitable that the resistance to deformation of the distal end portion of the female screw portion 5 as described above is reduced, and the female screw portion on the tension side as described above is inevitable. The deformation such that the tip of 5 is expanded is further promoted. Therefore, it is difficult to expect mechanical unification of the male screw part 6 and the female screw part 5 under the normal processing accuracy in the connection screw part 4, and it is difficult to reduce the bending strength. There is a problem that it is not easy to avoid. If the processing accuracy of the tapered screw is increased to such an extent that the male screw portion 6 and the female screw portion 5 can be mechanically integrated, the time and cost required for the thread cutting process become extremely high. Occurs.
【0005】そこで、本発明の鋼管杭の連結部は、上記
の問題点を解決し、鋼管杭の連結部の強度を低下させる
ことなく短時間で上下の鋼管杭同士を連結できる手段を
提供することを目的とする。Therefore, the connecting portion of the steel pipe pile of the present invention solves the above-mentioned problems, and provides means for connecting the upper and lower steel pipe piles in a short time without reducing the strength of the connecting portion of the steel pipe pile. The purpose is to:
【0006】[0006]
〔特徴構成〕上記の目的のための本発明の鋼管杭の連結
部の第1特徴構成は、請求項1に記載の如く、連結ネジ
部を、多条平行ネジで形成してある点にある。尚、本発
明の鋼管杭の連結部の第2特徴構成は、請求項2に記載
の如く、前記第1特徴構成における雄ネジ部の先端部側
のフランク角を、前記雄ネジ部の基端部側のフランク角
よりも大きくして、雌ネジ部のネジ面を、前記雄ネジ部
のネジ面に沿わせて形成してある点にあり、また、本発
明の鋼管杭の連結部の第3特徴構成は、請求項3に記載
の如く、前記第1特徴構成または前記第2特徴構成にお
ける雄ネジ部と前記鋼管杭の外周部との間に段部を設け
て、前記雄ネジ部の山径を、鋼管杭の外径よりも小さく
形成するとともに、前記段部を、雌ネジ部の端面を接当
可能な当たり面に構成してある点にある。[Characteristic configuration] A first characteristic configuration of the connecting portion of the steel pipe pile of the present invention for the above purpose is that the connecting screw portion is formed by a multi-parallel parallel screw. . According to a second characteristic configuration of the connecting portion of the steel pipe pile of the present invention, the flank angle of the distal end portion of the male screw portion in the first characteristic configuration is set at the base end of the male screw portion. The flank angle is larger than the flank angle of the female thread portion, and the screw surface of the female screw portion is formed along the screw surface of the male screw portion. As a third feature configuration, a step portion is provided between the male screw portion in the first feature configuration or the second feature configuration and an outer peripheral portion of the steel pipe pile, and The point is that the mountain diameter is formed smaller than the outer diameter of the steel pipe pile, and the step portion is formed as a contact surface to which the end face of the female screw portion can contact.
【0007】〔特徴構成の作用並びに効果〕上記第1特
徴構成によれば、充分な連結部の強度を維持しながら、
ネジ連結に要する時間を短縮することが可能になる。つ
まり、連結ネジ部を多条ネジで形成してあるから、リー
ドを大きくすることが可能であり、それだけ継杭時の上
方の鋼管杭の所要回転回数を減少できるのである。しか
も、前記連結ネジ部を平行ネジで構成してあるから、充
分なねじ込み力を以て前記連結ネジ部をねじ込んでもネ
ジの噛み合いに変化がないから、充分にねじ込んで締結
すれば、これに相当の面圧力を以て前記連結ネジ部のネ
ジ面同士が接当するので、鋼管杭の軸方向の連結力を確
保でき、ネジ山を損傷するおそれもないから、前記連結
ネジ部の両ネジ部を力学的に一体化して連結することが
可能になり、曲げ耐力を付与できるようになる。しか
も、平行ネジを形成してあるので、前記連結ネジ部の肉
厚を、基端部側から先端部側にかけて一定にすることが
できる。ここに、公知の手段であるが、前記連結ネジ部
を、弾性断面係数及び塑性断面係数が前記鋼管杭のそれ
と同等以上になるように形成することは極めて有効であ
り、連結した状態においてこれを成立させることはさら
に有効である。尚、本発明の鋼管杭の連結部の第2特徴
構成によって、ネジ継手の強度を低下させることなく下
方の鋼管杭に対する上方の鋼管杭の位置合わせが容易に
なる。つまり、ネジ山高さの範囲内の位置ズレに対して
は、上方の鋼管杭の下降に際して接当するネジ面が案内
面になるが、前記接当するネジ面のフランク角を大きく
することによって、傾斜の大きな案内面を形成できるか
ら、前記接当するネジ面が上方の鋼管杭の下降に際して
滑りやすくなる。しかも、反対側のネジ面のフランク角
を前記接当するネジ面のフランク角よりも小さくするこ
とによって、ネジ山の断面積を大きくすることが可能で
あり、ネジ継手強度を維持できる。さらに、建て込んだ
後の鋼管杭に作用する外力は、曲げ外力が主体となる
が、これに伴う半径方向の作用力に対しては、前記フラ
ンク角を大きくしたネジ面の作用で、前記作用力に対す
る反力を大きく維持できる。また、例えば、ネジ山の断
面積を維持しながら前記反対側のネジ面のフランク角を
相対的に小さくすれば、該フランク角は通常の山形ネジ
のネジ面のそれよりも小さくできるから、前記フランク
角を相対的に小さくした反対側のネジ面の面圧力は、ほ
ぼそのまま軸力に対応し、曲げ耐力を増強できるように
なる。さらに、本発明の鋼管杭の連結部の第3特徴構成
によって、継杭後の鋼管杭の建て込みに支障を来すこと
なく、鋼管杭の連結部の曲げ耐力を維持できるようにな
る。つまり、雌ネジ部の端面を接当可能な当たり面を備
えているから、平行ネジで構成されている前記連結ネジ
部を締め込むことによって、前記端面を前記当たり面に
所要の面圧力を付与できるから、前記連結ネジ部の曲げ
耐力を増強できるようになる。According to the first feature configuration, while maintaining a sufficient strength of the connecting portion,
The time required for screw connection can be reduced. That is, since the connecting screw portion is formed by the multi-threaded screw, the lead can be enlarged, and the required number of rotations of the steel pipe pile at the time of joining the pile can be reduced accordingly. Moreover, since the connecting screw portion is formed of parallel screws, even if the connecting screw portion is screwed with a sufficient screwing force, there is no change in the engagement of the screws. Since the screw surfaces of the connecting screw portions come into contact with each other with pressure, the connecting force in the axial direction of the steel pipe pile can be secured, and there is no risk of damaging the screw thread. It becomes possible to integrate and connect, and it becomes possible to provide bending strength. In addition, since the parallel screw is formed, the thickness of the connecting screw portion can be made constant from the base end side to the distal end side. Here, although it is a known means, it is extremely effective to form the connection screw portion so that the elastic section modulus and the plastic section coefficient are equal to or more than those of the steel pipe pile, and in a connected state, It is more effective to make it hold. In addition, the 2nd characteristic structure of the connection part of the steel pipe pile of this invention makes it easy to position the upper steel pipe pile with respect to the lower steel pipe pile without lowering the strength of the threaded joint. In other words, for a positional deviation within the range of the screw thread height, the screw surface that comes into contact when the upper steel pipe pile descends becomes the guide surface, but by increasing the flank angle of the screw surface that comes into contact, Since the guide surface having a large inclination can be formed, the screw surface to be brought into contact with the steel pipe pile is easily slipped when the upper steel pipe pile is lowered. Moreover, by making the flank angle of the opposite thread surface smaller than the flank angle of the abutting thread surface, it is possible to increase the cross-sectional area of the thread and maintain the strength of the threaded joint. Further, the external force acting on the steel pipe pile after being built is mainly a bending external force, but the acting force in the radial direction accompanying the external force is affected by the action of the screw surface having a larger flank angle. A large reaction force against force can be maintained. Also, for example, if the flank angle of the opposite thread surface is made relatively small while maintaining the cross-sectional area of the thread, the flank angle can be made smaller than that of the thread surface of a normal angled screw. The surface pressure of the screw surface on the opposite side where the flank angle is relatively reduced corresponds almost directly to the axial force, and the bending strength can be enhanced. Further, according to the third characteristic configuration of the connection portion of the steel pipe pile of the present invention, the bending strength of the connection portion of the steel pipe pile can be maintained without hindering the installation of the steel pipe pile after the joining pile. In other words, since the end surface of the female screw portion is provided with a contact surface that can be brought into contact with the female screw portion, a required surface pressure is applied to the end surface by tightening the connection screw portion formed of a parallel screw. As a result, the bending strength of the connecting screw portion can be enhanced.
【0008】[0008]
【発明の実施の形態】上記本発明の鋼管杭の連結部の実
施の形態の一例について、以下に、図面を参照しながら
説明する。尚、前記従来の技術において説明した要素と
同じ要素並びに同等の機能を有する要素に関しては、先
の図3及び図4に付したと同一の符号を付し、詳細の説
明の一部は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the connecting portion of the steel pipe pile according to the present invention will be described below with reference to the drawings. Note that the same elements as those described in the related art and elements having the same functions are denoted by the same reference numerals as those in FIGS. 3 and 4, and a part of the detailed description is omitted. .
【0009】図1は本発明による鋼管杭の連結部の一例
の連結を説明する要部の軸断面図であり、同図(イ)に
連結前の連結部を示し、同図(ロ)に連結後の連結部を
示した。また、図2に前記連結ネジ部のネジ形状の拡大
断面図で、同図(イ)に両ネジ部のネジ形状を拡大して
示し、同図(ロ)に螺合状態を示した。FIG. 1 is an axial sectional view of a main part for explaining an example of connection of a connecting portion of a steel pipe pile according to the present invention. FIG. 1A shows a connecting portion before connection, and FIG. The connecting portion after connection is shown. FIG. 2 is an enlarged cross-sectional view of the screw shape of the connection screw portion. FIG. 2A shows the screw shape of both screw portions in an enlarged manner, and FIG.
【0010】図示の鋼管杭1は、杭本体2を遠心力鋳造
鋼管で形成し、連結部3は別途鋳造した別部材を前記杭
本体2に溶接にすることによって前記鋼管杭1として一
体に構成してある。前記連結部3は、溶接部17を前記
鋼管杭と内外径共に同じくしてあり、先端部3b側を増
厚して、その増厚部16に連結ネジ部4を形成してあ
る。前記連結ネジ部4には、平行多条ネジを螺設し、前
記多条ネジのネジ山12を台形に形成して、ネジ山12
の前後のネジ面13の勾配を変え、前記ネジ山12の先
端部3b側(雄ネジ部6の先端部側に相当)のネジ面1
3aのフランク角α1を、小さく設定してある溶接部1
7側(雄ネジ部6の基端部側に相当)のフランク角α2
に比して大きくした台形ネジで構成する(図2参照)。
尚、ネジ山12の角度(α1+α2)は、前記連結ネジ
部4に曲げ外力が作用したときに、ネジ山12に作用す
る剪断応力が、山から谷にかけてほぼ均一になるように
設定することが好ましく、少なくとも山側のネジ山に作
用する剪断応力が谷側のネジ山に作用する剪断応力に比
して大きくないようにすることが好ましい。前記ネジ山
12の基端部側のネジ面13bのフランク角α2は、小
さくしてあることが好ましく、小さいほど前記連結部3
に曲げ外力が加わった際に作用する引張り力によって前
記雌ネジ部5に作用する径方向外方への分力が小さくな
り、前記雌ネジ部5が前記雄ネジ部6から離間すること
を防止できる。In the illustrated steel pipe pile 1, the pile main body 2 is formed of a centrifugally cast steel pipe, and the connecting portion 3 is integrally formed as the steel pipe pile 1 by welding a separately cast separate member to the pile main body 2. I have. The connecting portion 3 has the same welded portion 17 as that of the steel pipe pile in both the inner and outer diameters, and has a thicker portion at the tip portion 3b side, and the connecting screw portion 4 is formed in the thickened portion 16. A parallel multi-thread screw is screwed into the connection screw portion 4, and a thread 12 of the multi-thread screw is formed in a trapezoidal shape.
The thread surface 1 on the tip 3b side of the screw thread 12 (corresponding to the tip end side of the male thread portion 6) is changed by changing the gradient of the thread surface 13 before and after the thread.
Welded part 1 in which the flank angle α1 of 3a is set small
The flank angle α2 on the 7 side (corresponding to the base end side of the male screw section 6)
(Fig. 2).
The angle (α1 + α2) of the screw thread 12 may be set so that the shear stress acting on the screw thread 12 when the external bending force is applied to the connection screw portion 4 becomes substantially uniform from the peak to the valley. Preferably, it is preferable that at least the shear stress acting on the thread on the crest side is not greater than the shear stress acting on the thread on the trough side. The flank angle α2 of the screw surface 13b on the base end side of the screw thread 12 is preferably small, and the smaller the flank angle α2 is, the smaller the flank angle α2 is.
The radially outward component acting on the female screw portion 5 is reduced by the tensile force applied when a bending external force is applied to the female screw portion, thereby preventing the female screw portion 5 from separating from the male screw portion 6. it can.
【0011】前記連結部3は、杭本体2の一端側に溶接
接続される雌ネジ部5を備える一端側連結部8と、他端
側に溶接される雄ネジ部6を備える他端側連結部9と
を、前記雌ネジ部5と前記雄ネジ部6とを相互に螺合し
て連結するように構成して、前記増厚部16の最小内径
が等しくなるように(連結状態で連続する内周面を形成
するように)形成する。The connecting portion 3 has one end connecting portion 8 having a female screw portion 5 welded to one end of the pile main body 2 and the other end connecting portion having a male screw portion 6 welded to the other end. The internal thread 9 and the external thread 6 are connected to each other by screwing the female thread 5 and the external thread 6 so that the minimum inner diameters of the thickened portions 16 are equal (continuously in the coupled state). (So as to form an inner peripheral surface).
【0012】前記一端側連結部8には、前記増厚部16
の先端部3b側の内周側を、内側段部8aを形成して拡
径した前記雌ネジ部5を形成し、前記他端側連結部9に
は、前記増厚部16の先端部3b側の外周側を、外側段
部9a(請求項3記載の段部1bに相当)を形成して縮
径した前記雄ネジ部6を形成するとともに、その雄ネジ
の山径が前記連結部3の外周部3aの外径よりも小さく
なるようにし、前記雌ネジ部5の肉厚を確保できるよう
にして、前記雄ネジ部6と前記雌ネジ部5の肉厚をほぼ
等しくする。前記外側段部9aが前記一端側連結部8の
先端部の端面8b(請求項3記載の端面1cに相当、即
ち、鋼管杭1の端面1cと同等)を接当可能な当たり面
7となるように、前記雄ネジ部6の長さと前記雌ネジ部
5の長さを等しく(少なくとも前記雄ネジ部6の長さが
前記雌ネジ部5の長さよりも短くならないように)す
る。このように構成すれば、前記連結ネジ部4を連結し
た状態では、少なくとも前記一端側連結部8の端面8b
が前記他端側連結部9の外側段部9aに強く押し当てら
れているので、上下の鋼管杭1を連結している前記連結
部3に曲げ外力が加わって、引張り側に引張り力が作用
しても、前記引張り側での前記端面1cの前記外側段部
9aからの離間を防止できるので、従来のように雌ネジ
部5が先端部3bで雄ネジ部6から半径方向外方に離間
して曲げ耐力を減殺することを防止できる。The one end side connecting portion 8 includes the thickening portion 16
The inner peripheral side on the side of the distal end portion 3b is formed with an internal stepped portion 8a to form the female screw portion 5 whose diameter is increased, and the other end side connecting portion 9 is provided with the distal end portion 3b of the thickened portion 16. An outer step 9a (corresponding to the step 1b of claim 3) is formed on the outer peripheral side to form the male screw portion 6 whose diameter is reduced, and the male screw has a thread diameter equal to the connecting portion 3. The outer diameter of the external thread 3a is made smaller than that of the outer thread 3a, and the thickness of the female thread 5 is ensured so that the thickness of the male thread 6 and the thickness of the female thread 5 are substantially equal. The outer step 9a serves as a contact surface 7 that can contact an end surface 8b (corresponding to the end surface 1c of the third embodiment, that is, equivalent to the end surface 1c of the steel pipe pile 1) at the tip end of the one end side connection portion 8. In this way, the length of the male screw portion 6 is made equal to the length of the female screw portion 5 (so that at least the length of the male screw portion 6 is not shorter than the length of the female screw portion 5). With such a configuration, at least the end face 8 b of the one end side connection part 8 is in a state where the connection screw part 4 is connected.
Is strongly pressed against the outer step portion 9a of the other end side connecting portion 9, so that an external bending force is applied to the connecting portion 3 connecting the upper and lower steel pipe piles 1, and a pulling force acts on the pulling side. However, since the separation of the end surface 1c from the outer step 9a on the pulling side can be prevented, the female screw 5 is separated from the male screw 6 radially outward at the distal end 3b as in the related art. This can prevent the bending strength from being reduced.
【0013】次に、本発明の他の実施の形態について説
明する。 〈1〉上記実施の形態に於いては、ネジ山を台形に形成
する例を示したが、ネジ山を矩形に形成してあってもよ
い。つまり、フランク角α1及びフランク角α2を共に
ゼロにしてあれば、前記連結部3に曲げ外力が加わった
際に、前記雄ネジ部6及び前記雌ネジ部5に作用する管
径方向の分力を実質的になくすることができるので、前
記連結ネジ部4の変形を防止でき、前記連結部3の曲げ
耐力を増強できる。尚、前記雄ネジ部6を前記雌ネジ部
5に嵌装する際の位置合わせの案内は、別途の手段を講
ずればよい。例えば、前記雄ネジ部6、前記雌ネジ部5
共に、先端部3bにネジ無し部を設け、前記先端部3b
のネジ無し部にテーパ面取りを施すことによっても位置
合わせの案内は可能である。 〈2〉上記実施の形態においては、連結ネジ部4のネジ
山12を、両底角を異ならせた台形に形成した例を示し
たが、例えば図3に示すように、バックラッシュを大き
くとったネジ山とネジ谷を形成してあれば、回転が容易
であるうえに、雌ねじ部5を形成してある一端側連結部
8に他端側連結部9の雄ねじ部6を螺入して締め込ん
で、前記一端側連結部8の端面8bが前記他端側連結部
9の外側段部9aに接当した状態では、前記雌ねじ部6
の先端部3b側のネジ面13aに前記雌ねじ部5の先端
部3b側のネジ面13aに接しているが、ネジ面13b
どうしは離間した状態にある。ここで、上側の鋼管杭1
を吊り上げて、さらに回転してねじ込むことにより、前
記離間したネジ面13bどうしを密着させることができ
る。これで締め込みを終わるが、前記端面8bと前記外
側段部9aが密着しているから、確実に上下の鋼管杭1
を、連結部3に圧縮応力を付与した状態で連結できる。
尚、図3にはネジ山を長方形断面のものとして示した
が、図1或いは図2に示した台形状の断面のネジ山形状
であってもよい。 〈3〉上記図3に示した例では、連結ネジ部4のネジ山
12を、両側のネジ面13のフランク角が0°である長
方形状とした例を示したが、このようにすれば、鋼管杭
1どうしを連結部3で締結した際に、ネジ面12により
締結力に対応する半径方向の分力の生成がないので、連
結した鋼管杭1に曲げ外力が作用した際の、曲げ半径の
外方に当たる雌ねじ部5の雄ねじ部6からの離間を防止
でき、曲げ耐力の低下を抑制できる。さらに、上記のよ
うに、バックラッシュを大きくとって、例えばネジピッ
チに対してネジ山の高さを例えば25〜30%程度に低
くして、且つネジ谷の幅に対してネジ山の幅を55〜6
0%程度に狭くしておけば、連結ネジ部4の先端部3b
側のネジ端部に形成される不完全ネジ部に多少の形状の
不整が生じても前記雄ねじ部6の前記雌ねじ部5への螺
入に対して障害となることを抑制できる。尚、上記のよ
うに、ネジ山の高さを低くできるのは、連結ネジ部に対
して鋼管杭の長さ方向の大きな引張り強度を必要としな
いからである。つまり、下側に連結した鋼管杭を吊り下
げるに際しての下方への引張力と、連結後の鋼管杭に加
わる曲げ外力に伴う前記長さ方向の引張力とに耐えれば
十分なのである。 〈4〉上記〈2〉又は〈3〉において、前記連結ネジ部
4の先端部3b側(図1参照)における前記雄ねじ部6
及び雌ねじ部5の不完全ネジ部を削除しておけば、前記
連結部3の雌ねじ部5への雄ねじ部6の螺入に際して、
ネジ山端部の不完全に起因する不正な噛み合いを防止で
き、正常な螺合を開始できるようになる。さらに、ネジ
加工後の前記先端部3b側ネジ端部のカエリの削除作業
の後の、或いは前記ネジ加工後に前記先端部3b側のネ
ジ無し部を切削形成した後のネジ端部の補正整形作業を
省略できる。Next, another embodiment of the present invention will be described. <1> In the above embodiment, the example in which the screw thread is formed in a trapezoidal shape has been described, but the screw thread may be formed in a rectangular shape. That is, if both the flank angle α1 and the flank angle α2 are set to zero, when a bending external force is applied to the connecting portion 3, a component force acting on the male screw portion 6 and the female screw portion 5 in the pipe diameter direction is applied. Can be substantially eliminated, so that the deformation of the connection screw portion 4 can be prevented, and the bending strength of the connection portion 3 can be enhanced. It should be noted that, when the male screw portion 6 is fitted into the female screw portion 5, a positioning guide may be provided by another means. For example, the male screw part 6, the female screw part 5
In both cases, a screwless portion is provided at the tip 3b, and the tip 3b is provided.
The alignment can also be guided by tapered chamfering the screwless portion. <2> In the above embodiment, the example in which the thread 12 of the connecting screw portion 4 is formed in a trapezoidal shape with different base angles is shown. For example, as shown in FIG. If the screw thread and the thread groove are formed, rotation is easy, and the male screw portion 6 of the other end side connecting portion 9 is screwed into the one end side connecting portion 8 forming the female screw portion 5. When the end face 8b of the one end side connection portion 8 is in contact with the outer step 9a of the other end side connection portion 9, the female screw portion 6 is tightened.
Is in contact with the screw surface 13a on the distal end 3b side of the female screw portion 5 on the screw surface 13a on the distal end portion 3b side.
They are separated from each other. Here, the upper steel pipe pile 1
Is lifted, and further rotated and screwed in, the separated screw surfaces 13b can be brought into close contact with each other. This ends the tightening, but since the end face 8b and the outer step 9a are in close contact with each other, the upper and lower steel pipe piles 1 are surely secured.
Can be connected in a state where a compressive stress is applied to the connecting portion 3.
Although the screw thread is shown as having a rectangular cross section in FIG. 3, the screw thread may have a trapezoidal cross section shown in FIG. 1 or FIG. <3> In the example shown in FIG. 3 described above, the screw thread 12 of the connection screw part 4 is formed in a rectangular shape in which the flank angles of the screw faces 13 on both sides are 0 °. When the steel pipe piles 1 are fastened to each other at the connecting portion 3, there is no generation of a radial component corresponding to the fastening force due to the screw surface 12, so that the bending when external bending force acts on the connected steel pipe piles 1. It is possible to prevent the female screw portion 5 hitting the outside of the radius from being separated from the male screw portion 6, and to suppress a decrease in bending strength. Further, as described above, the backlash is increased, for example, the height of the screw thread is reduced to, for example, about 25 to 30% with respect to the screw pitch, and the width of the screw thread is set to 55 with respect to the width of the screw root. ~ 6
If it is narrowed to about 0%, the tip 3b of the connecting screw 4
Even if there is some irregularity in the shape of the incomplete screw portion formed at the screw end portion on the side, it is possible to suppress the obstruction of the male screw portion 6 from being screwed into the female screw portion 5. As described above, the height of the screw thread can be reduced because a large tensile strength in the length direction of the steel pipe pile is not required for the connecting screw portion. That is, it suffices to withstand the downward tensile force when suspending the steel pipe pile connected to the lower side and the longitudinal tensile force accompanying the external bending force applied to the connected steel pipe pile. <4> In the above <2> or <3>, the male screw portion 6 on the distal end portion 3b side of the connection screw portion 4 (see FIG. 1).
If the incompletely threaded portion of the female thread portion 5 is deleted, when the male thread portion 6 is screwed into the female thread portion 5 of the connecting portion 3,
It is possible to prevent improper engagement due to imperfect thread ends, and to start normal engagement. Furthermore, the correction shaping operation of the screw end after the removal of the burrs of the screw end on the tip 3b side after the screw processing, or after the screwless part on the tip 3b side is cut and formed after the screw processing. Can be omitted.
【0014】[0014]
【実施例】上記実施の形態の項で説明した本発明の鋼管
杭の連結部の具体的な構成について以下に示す。鋼管杭
1の杭本体2は、外径300mm、肉厚39mmの遠心
力鋳造鋼管杭であり、連結部3は別部材を前記杭本体2
と一体に溶接して構成してある。前記連結部3は、前記
杭本体2の外周部2a(鋼管杭1の外周部1a)と同径
の外周部3aを備えて、前記杭本体2よりも厚肉に形成
して肉厚を86mmとし、前記杭本体2に接続する溶接
部17を、内径をなだらかに拡径して前記杭本体2と内
径を同じくし、肉厚を39mmとしてあり、先端部3b
側の増厚部16に連結ネジ部4を形成してある。前記杭
本体2の他端側に接続する一端側連結部8は、前記増厚
部16の内周部との間に内側段部8aを設けて、180
mmにわたって前記雌ネジ部5を形成してあり、前記杭
本体2の一端側に接続する他端側連結部9は、前記増厚
部16の位置の外周部3aとの間に外側段部9aを設け
て、180mmにわたって前記雄ネジ部6を形成してあ
り、夫々に全長328mmとしてある。前記雄ネジ部6
と前記雌ネジ部5とのピッチ円は、前記増厚部16の肉
厚中心に位置させてある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete construction of the connecting portion of the steel pipe pile of the present invention described in the above embodiment will be described below. The pile main body 2 of the steel pipe pile 1 is a centrifugal force cast steel pipe pile having an outer diameter of 300 mm and a wall thickness of 39 mm.
And are integrally welded. The connecting portion 3 has an outer peripheral portion 3a having the same diameter as the outer peripheral portion 2a of the pile main body 2 (the outer peripheral portion 1a of the steel pipe pile 1), and is formed thicker than the pile main body 2 to have a thickness of 86 mm. The welded portion 17 connected to the pile main body 2 has the same inner diameter as the pile main body 2 by gently expanding the inner diameter, and has a thickness of 39 mm.
The connecting screw portion 4 is formed in the thickened portion 16 on the side. One end side connecting portion 8 connected to the other end side of the pile main body 2 is provided with an inner step portion 8a between itself and the inner peripheral portion of the thickened portion 16, and
The female screw part 5 is formed over the entire length of the pile body 2, and the other end side connecting part 9 connected to one end side of the pile main body 2 is provided with an outer step part 9 a between the outer peripheral part 3 a at the position of the thickened part 16. The male screw portions 6 are formed over 180 mm, and each has a total length of 328 mm. The male screw part 6
And the pitch circle between the female screw portion 5 and the female screw portion 5 is located at the center of the thickness of the thickened portion 16.
【0015】前記連結ネジ部4には、平行台形ネジが螺
設してあり、雄ネジ部6、雌ネジ部5共に前記台形ネジ
のネジ山12の先端部3b側のネジ面13aのフランク
角α1は28.13°に、ネジ山12の前記溶接部17
側のネジ面13bのフランク角α2は11.87°にし
て、ネジ山の角度を40°とし(図2参照)、ネジ山の
高さは夫々3.17mmとし、ネジのピッチは8.56
mm、従ってリードを25.68mmに形成して、約1
80mmにわたって3条ネジとして螺設してある。A parallel trapezoidal screw is screwed into the connection screw portion 4. Both the male screw portion 6 and the female screw portion 5 have a flank angle of the screw surface 13 a on the tip 3 b side of the thread 12 of the trapezoidal screw. α1 is 28.13 °, and the welded portion 17 of the thread 12 is
The flank angle α2 of the screw surface 13b on the side is 11.87 °, the angle of the screw thread is 40 ° (see FIG. 2), the height of the screw thread is 3.17 mm, and the pitch of the screw is 8.56.
mm, and thus the lead is formed to 25.68 mm, and
It is screwed as a triple thread over 80 mm.
【0016】[0016]
【発明の効果】以上説明したように、本発明によって、
鋼管杭の連結部の強度を低下させることなく短時間で上
下の鋼管杭同士を連結できる。As described above, according to the present invention,
The upper and lower steel pipe piles can be connected to each other in a short time without reducing the strength of the connection part of the steel pipe piles.
【0017】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.
【図1】本発明による鋼管杭の連結部の一例を説明する
要部縦断面説明図FIG. 1 is an explanatory longitudinal sectional view of an essential part for explaining an example of a connecting portion of a steel pipe pile according to the present invention.
【図2】図1に示した連結部のネジの詳細を説明する要
部縦断面説明図FIG. 2 is an explanatory longitudinal sectional view of an essential part for explaining details of a screw of a connecting part shown in FIG. 1;
【図3】連結部のネジの他の例の詳細を説明する要部縦
断面説明図FIG. 3 is an explanatory longitudinal sectional view of an essential part for explaining details of another example of a screw of a connecting part.
【図4】従来の鋼管杭の連結の一例を説明する要部縦断
面説明図FIG. 4 is an explanatory longitudinal sectional view of an essential part for explaining an example of connection of a conventional steel pipe pile.
【図5】従来の鋼管杭の連結部の他の例を説明する要部
縦断面図FIG. 5 is a vertical sectional view of a main part for explaining another example of a connecting portion of a conventional steel pipe pile.
1 鋼管杭 1a 鋼管杭の外周部 1b 鋼管杭の段部 1c 鋼管杭の端面 4 連結ネジ部 5 雌ネジ部 6 雄ネジ部 7 当たり面 13 ネジ面 DESCRIPTION OF SYMBOLS 1 Steel pipe pile 1a Peripheral part of steel pipe pile 1b Step part of steel pipe pile 1c End face of steel pipe pile 4 Connection screw part 5 Female screw part 6 Male screw part 7 Contact surface 13 Screw surface
Claims (3)
端部に螺設された雌ネジ部(5)と、他方の鋼管杭
(1)の他端部に螺設された雄ネジ部(6)とを螺合し
て連結する連結ネジ部(4)を備えた鋼管杭の連結部で
あって、 前記連結ネジ部(4)を、多条平行ネジで形成してある
鋼管杭の連結部。A female screw part (5) screwed at one end of one steel pipe pile (1) connected vertically and a male screw screwed at the other end of the other steel pipe pile (1). A connection part of a steel pipe pile provided with a connection screw part (4) for screwing and connecting the part (6), wherein the connection screw part (4) is formed by a multi-row parallel screw. Connection.
ク角を、前記雄ネジ部(6)の基端部側のフランク角よ
りも大きくして、 前記雌ネジ部(5)のネジ面(13)を、前記雄ネジ部
(6)のネジ面(13)に沿わせて形成してある請求項
1記載の鋼管杭の連結部。2. The flank angle of the male screw part (6) on the distal end side is made larger than the flank angle of the male screw part (6) on the base end side, and the female screw part (5) is formed. The connection portion of a steel pipe pile according to claim 1, wherein the thread surface (13) is formed along the thread surface (13) of the male thread portion (6).
の外周部(1a)との間に段部(1b)を設けて、前記
雄ネジ部(6)の山径を、前記鋼管杭(1)の外径より
も小さく形成するとともに、 前記段部(1b)を、前記雌ネジ部(5)の端面(1
c)を接当可能な当たり面(7)に構成してある請求項
1又は2に記載の鋼管杭の連結部。3. The male screw part (6) and the steel pipe pile (1).
A step (1b) is provided between the outer thread (1a) and the outer diameter of the steel pipe pile (1) so that the external thread (6) has a smaller diameter than the outer diameter of the steel pipe pile (1). (1b) is connected to the end face (1) of the female screw portion (5).
3. The connecting part of a steel pipe pile according to claim 1, wherein c) is configured as a contactable contact surface (7).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20295197A JPH1143938A (en) | 1997-07-29 | 1997-07-29 | Steel pipe pile connection part |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20295197A JPH1143938A (en) | 1997-07-29 | 1997-07-29 | Steel pipe pile connection part |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1143938A true JPH1143938A (en) | 1999-02-16 |
Family
ID=16465873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20295197A Pending JPH1143938A (en) | 1997-07-29 | 1997-07-29 | Steel pipe pile connection part |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1143938A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003105755A (en) * | 2001-10-02 | 2003-04-09 | Asahi Kasei Corp | Joint structure of different diameter steel pipe piles |
JP2003129467A (en) * | 2001-10-26 | 2003-05-08 | Asahi Kasei Corp | Structure of starting end of female/male thread |
JP2011052396A (en) * | 2009-08-31 | 2011-03-17 | Daiwa Lantec Higashi Nihon Kk | Structure and bracket for joining small-diameter steel pipe pile, and method for constructing the small-diameter steel pipe pile |
KR101055316B1 (en) * | 2009-01-29 | 2011-08-09 | 김지희 | Cone Shaped Steel Pipe Pile |
KR101164659B1 (en) * | 2011-09-28 | 2012-07-12 | 지앤에스건설 주식회사 | Shear force reinforcing apparatus of spiral type steel bar for reinforcing of micro-pile |
CN102644270A (en) * | 2011-02-17 | 2012-08-22 | 上海奥米制药装备有限公司 | Precast-concrete solid pile |
CN103103981A (en) * | 2013-02-19 | 2013-05-15 | 河海大学 | Prestress wedge-shaped pipe pile joint technology and construction method thereof |
JP2013213361A (en) * | 2012-04-03 | 2013-10-17 | Ohbayashi Corp | Structure, method and nut body for joining steel pipe |
JP2015140548A (en) * | 2014-01-28 | 2015-08-03 | 株式会社大林組 | Joining method for steel-pipe column |
KR20150139422A (en) * | 2015-04-07 | 2015-12-11 | 주식회사 포스코 | Complex pile |
JP2018172861A (en) * | 2017-03-31 | 2018-11-08 | Jfeスチール株式会社 | Parallel threaded joint for structural steel pipe |
JP2021080792A (en) * | 2019-11-22 | 2021-05-27 | Chb株式会社 | Screw joint for steel pipe pile |
CN112942330A (en) * | 2021-01-30 | 2021-06-11 | 唐山中鼎建筑设计咨询有限公司 | Connect stable steel-pipe pile connection structure |
-
1997
- 1997-07-29 JP JP20295197A patent/JPH1143938A/en active Pending
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003105755A (en) * | 2001-10-02 | 2003-04-09 | Asahi Kasei Corp | Joint structure of different diameter steel pipe piles |
JP2003129467A (en) * | 2001-10-26 | 2003-05-08 | Asahi Kasei Corp | Structure of starting end of female/male thread |
KR101055316B1 (en) * | 2009-01-29 | 2011-08-09 | 김지희 | Cone Shaped Steel Pipe Pile |
JP2011052396A (en) * | 2009-08-31 | 2011-03-17 | Daiwa Lantec Higashi Nihon Kk | Structure and bracket for joining small-diameter steel pipe pile, and method for constructing the small-diameter steel pipe pile |
CN102644270A (en) * | 2011-02-17 | 2012-08-22 | 上海奥米制药装备有限公司 | Precast-concrete solid pile |
KR101164659B1 (en) * | 2011-09-28 | 2012-07-12 | 지앤에스건설 주식회사 | Shear force reinforcing apparatus of spiral type steel bar for reinforcing of micro-pile |
JP2013213361A (en) * | 2012-04-03 | 2013-10-17 | Ohbayashi Corp | Structure, method and nut body for joining steel pipe |
CN103103981A (en) * | 2013-02-19 | 2013-05-15 | 河海大学 | Prestress wedge-shaped pipe pile joint technology and construction method thereof |
JP2015140548A (en) * | 2014-01-28 | 2015-08-03 | 株式会社大林組 | Joining method for steel-pipe column |
KR20150139422A (en) * | 2015-04-07 | 2015-12-11 | 주식회사 포스코 | Complex pile |
JP2018172861A (en) * | 2017-03-31 | 2018-11-08 | Jfeスチール株式会社 | Parallel threaded joint for structural steel pipe |
JP2021080792A (en) * | 2019-11-22 | 2021-05-27 | Chb株式会社 | Screw joint for steel pipe pile |
CN112942330A (en) * | 2021-01-30 | 2021-06-11 | 唐山中鼎建筑设计咨询有限公司 | Connect stable steel-pipe pile connection structure |
CN112942330B (en) * | 2021-01-30 | 2022-02-22 | 唐山中鼎建筑设计咨询有限公司 | Connect stable steel-pipe pile connection structure |
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