JPH11247189A - Spliced pile structure made of steel pipe - Google Patents
Spliced pile structure made of steel pipeInfo
- Publication number
- JPH11247189A JPH11247189A JP5047798A JP5047798A JPH11247189A JP H11247189 A JPH11247189 A JP H11247189A JP 5047798 A JP5047798 A JP 5047798A JP 5047798 A JP5047798 A JP 5047798A JP H11247189 A JPH11247189 A JP H11247189A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- spiral
- collar
- diameter
- steel pipe
- 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、土木・建築構造物
の基礎杭として用いられる鋼管杭に係わるものであり、
特に、ねじり込み工法によって施工されるらせん状つば
付き鋼管杭の継杭構造に関するものである。The present invention relates to a steel pipe pile used as a foundation pile for civil engineering and building structures,
In particular, the present invention relates to a joint pile structure of a steel pipe pile with a helical collar constructed by a twisting method.
【０００２】[0002]
【従来の技術】杭を施工する際に、騒音振動の問題を解
決するために、杭を静的にねじり込む工法が知られてお
り、それに用いるための杭材も種々のものが考案されて
いる。ねじり込みにより発生するねじりトルクに対して
十分な材料強度を有するという点から、杭の材料として
は鋼管を用いることが多い。鋼管の地盤への貫入性を良
くするために、また地盤との摩擦力を多くとるために、
杭体の途中に複数個のつばを設けるなどの例がある。こ
れらは、例えば、実公平４−１９０８０号公報、実公平
７−２６７７号公報、特開平５−３１１６４９号公報に
示されている。2. Description of the Related Art When constructing a pile, a method of statically twisting the pile is known to solve the problem of noise and vibration, and various pile materials have been devised. I have. A steel pipe is often used as a pile material because it has sufficient material strength against the torsional torque generated by the twisting. In order to improve the penetration of the steel pipe into the ground and to increase the frictional force with the ground,
There is an example in which a plurality of collars are provided in the middle of a pile. These are disclosed in, for example, Japanese Utility Model Publication No. 4-19080, Japanese Utility Model Publication No. 7-2677, and Japanese Patent Application Laid-Open No. Hei 5-31649.
【０００３】前述の公知技術について簡単に説明する
と、実公平４−１９０８０号公報では、下端に掘削刃を
有し、杭本体の下端より杭本体の直径の１／２〜２倍の
距離を隔てた上方位置、およびそれより所要距離隔てた
上方位置の杭本体の外周面に、それぞれ杭本体の外径の
ほぼ２倍の外径を有する翼巾の大きな同一径のらせん翼
を、ほぼ一巻きにわたり突設した構成が開示されてい
る。The above-mentioned known technique will be briefly described. In Japanese Utility Model Publication No. 4-19080, an excavating blade is provided at a lower end, and is spaced from the lower end of the pile main body by a distance of 1/2 to twice the diameter of the pile main body. Helical wings of the same diameter with a large wing span, each having an outer diameter approximately twice as large as the outer diameter of the pile main body, are respectively wound around the outer peripheral surface of the pile main body at the upper position and at a predetermined distance above the pile main body. Are disclosed.
【０００４】実公平７−２６７７号公報では、掘削刃を
取付けた鋼管杭本体の外周面に、そのほぼ全長にわたっ
て鋼管杭本体の外径より２〜３倍の外径を有し、その外
径のほぼ４分の１のピッチとしたほぼ一巻きにわたるら
せん翼を、らせん翼のピッチの倍数長さの等間隔をおい
て突設した構成が開示されている。特開平５−３１１６
４９号公報においては、鋼管杭本体の下端に底板と掘削
刃を設け、鋼管杭本体の外周面には、その長さ方向にほ
ぼ等間隔をおいて、鋼管杭本体の外径の２倍以上の径と
したほぼ一巻きにわたるねじこみ用らせん翼を突設し、
かつ、それらの隔設したらせん翼の外径を、上部にいく
に従い一定比率で大径とした構成が開示されている。[0004] In Japanese Utility Model Publication No. Hei 7-2677, the outer diameter of the steel pipe pile main body to which the excavation blade is attached has an outer diameter that is approximately two to three times the outer diameter of the steel pipe pile main body over substantially the entire length thereof. A configuration is disclosed in which spiral wings having a pitch of approximately one-fourth and extending over substantially one turn are protruded at equal intervals of a multiple of the pitch of the spiral wings. JP-A-5-3116
In Japanese Patent Publication No. 49, a bottom plate and an excavating blade are provided at the lower end of the steel pipe pile main body, and the outer peripheral surface of the steel pipe pile main body is provided at substantially equal intervals in the length direction thereof, at least twice the outer diameter of the steel pipe pile main body. A spiral wing for screwing over approximately one turn with a diameter of
In addition, a configuration is disclosed in which the outer diameter of the separated spiral wings is increased at a constant rate toward the upper part.
【０００５】一般的に、地表面付近の地盤ほど地質年齢
が若く、深い所にある地層に比べて力学的な強度が小さ
い。この点に関して、前述の公知技術において、次のよ
うな問題点があった。すなわち、実公平４−１９０８０
号公報の技術では、杭の途中に設けられたらせん翼がす
べて同一径であるために、深度の大きな位置で得られる
摩擦力と比べて地表面付近の摩擦力が相対的に小さくな
り、地表面付近の地層に限って言えば、らせん翼を付け
ても、らせん翼がその効果を十分に発揮しているとは言
いがたかった。In general, the ground near the ground surface has a younger geological age, and has a lower mechanical strength than a deeper stratum. In this regard, the above-described known technology has the following problems. That is, actual fairness 4-190080
In the technology disclosed in the publication, the spiral wings provided in the middle of the pile all have the same diameter, so that the frictional force near the ground surface becomes relatively smaller than the frictional force obtained at a position with a large depth, Speaking of the geological strata near the surface, it was hard to say that even with the spiral wings, the spiral wings were sufficiently effective.
【０００６】実公平７−２６７７号公報の技術において
は、らせん翼の設置間隔をらせん翼のピッチの倍数とし
たために、必ず同じ軌跡を通ってらせん翼がねじり込ま
れるという特徴があるが、らせん翼がすべて同一径であ
るために、前述の実公平４−１９０８０号公報の場合と
全く同様の問題が発生していた。特開平５−３１１６４
９号公報の技術では、杭に設けられたらせん翼の径を、
上方にいくにしたがって大径としているので、上方に行
くほど摩擦力が大きく取れるようになっているが、全体
がくさび状になって地盤に貫入していくために、貫入抵
抗が大きく、施工が困難になることがあった。さらに、
下方から上方へとらせん翼の径を一定割合で拡大してい
くために、らせん翼の寸法が一枚毎に異なり、らせん翼
の加工および杭への取付加工が複雑になって、実用上不
適当なものであった。The technique disclosed in Japanese Utility Model Publication No. Hei 7-2677 has a feature that the spiral blades are always twisted along the same trajectory because the interval between the spiral blades is a multiple of the pitch of the spiral blades. Since all the wings have the same diameter, the same problem as in the above-mentioned Japanese Utility Model Publication No. 4-19080 has occurred. JP-A-5-31164
In the technology disclosed in JP-A-9, the diameter of the spiral wing provided on the pile is
As the diameter increases as it goes upward, the friction force can be increased as it goes upward, but since the whole becomes wedge-shaped and penetrates into the ground, the penetration resistance is large, Sometimes it was difficult. further,
In order to increase the diameter of the spiral blade from the bottom to the top at a fixed rate, the dimensions of the spiral blade differ from one sheet to another, making the processing of the spiral blade and mounting to the pile complicated, which is impractical for practical use. It was appropriate.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、地表面付近
の弱い地盤に対しても大きな摩擦力を取ることができ、
貫入抵抗が小さく施工が容易な継杭構造を提供すること
を目的とする。According to the present invention, a large frictional force can be taken even on a weak ground near the ground surface,
An object of the present invention is to provide a joint pile structure having a small penetration resistance and easy construction.
【０００８】[0008]
【課題を解決するための手段】本発明者は、上記課題の
解決のために検討の結果、本発明をなすに至った。即
ち、本発明は、（Ａ）最下端部に少なくとも杭の先端部
を閉塞する底板と、掘削爪が設けられ、外周面にらせん
状つばが少なくとも１個設けられており、かつ、該らせ
ん状つばの径が同一である鋼管製の下杭、及び、（Ｂ）
外周面にらせん状つばが少なくとも１個設けられてお
り、該らせん状つばの径が、該下杭に設けられたらせん
状つばの径と同一か又はそれよりも大であり、かつ、該
らせん状つばの少なくとも１個の径が、該下杭に設けら
れたらせん状つばの径よりも大である鋼管製の上杭、を
構成要素とする鋼管製の継杭構造である。Means for Solving the Problems The present inventor has made studies as a result of solving the above problems, and has accomplished the present invention. That is, the present invention provides (A) a bottom plate that closes at least the tip of a pile at the lowermost end, a drilling claw, and at least one spiral collar on an outer peripheral surface; A lower pile made of steel pipe having the same diameter of the brim, and (B)
At least one helical collar is provided on the outer peripheral surface, the diameter of the helical collar is equal to or larger than the diameter of the helical collar provided on the lower pile, and the helical collar is provided. A steel pipe joint pile structure comprising a steel pipe upper pile in which at least one diameter of the collar is larger than the diameter of the spiral collar provided on the lower pile.
【０００９】本発明においては、上杭に設けられている
らせん状つばのうち、少なくとも１個の径は、下杭に設
けられているらせん状つばの径よりも大であることが必
要であり、通常は、その直径が１０〜５０％程度大であ
ることが好ましい。また、（Ａ）下杭と（Ｂ）上杭との
間に中間杭を有してもよく、中間杭にはらせん状つばを
設けなくともよい。中間杭にらせん状つばを設ける場合
は、下杭と同じ径のらせん状つばが好ましい。In the present invention, it is necessary that at least one of the helical collars provided on the upper pile has a diameter larger than that of the helical collar provided on the lower pile. Usually, the diameter is preferably as large as about 10 to 50%. Further, an intermediate pile may be provided between (A) the lower pile and (B) the upper pile, and the intermediate pile may not be provided with a spiral collar. When a spiral collar is provided on the intermediate pile, a spiral collar having the same diameter as the lower pile is preferable.
【００１０】[0010]
【発明の実施の形態】以下、図に基づき、本発明の継杭
構造の一例を説明する。図１は、本発明の継杭構造の一
例の立面図である。杭本体１は鋼管により作られてい
る。図１では、上杭１ａと下杭１ｂで構成されている例
を示している。杭同志は、継手部６で接続されている。
杭の接続は、アーク溶接によるのが一般的であるが、ネ
ジ式継手等で機械的に接続する方法も考案されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a joint pile structure according to the present invention will be described with reference to the drawings. FIG. 1 is an elevation view of an example of the joint pile structure of the present invention. The pile body 1 is made of a steel pipe. FIG. 1 shows an example in which an upper pile 1a and a lower pile 1b are configured. The piles are connected by a joint 6.
The connection of the piles is generally performed by arc welding, but a method of mechanically connecting with a threaded joint or the like has also been devised.
【００１１】下杭１ｂの先端には、底板２と掘削爪３と
らせん状つば４が取付けられている。杭の先端支持力を
確保するために、底板２は杭の先端を閉塞するように取
付けられている。らせん状つば４の外径は、杭本体の外
径の２倍程度とする。杭の途中には、らせん状つば４が
所定の間隔でとりつけられている。らせん状つば４は、
一端が開いたドーナツ形の鉄板をひねって、ほぼ一巻の
らせん状に形成されており、杭本体には溶接によって接
合されている。下杭１ｂにとりつけられるらせん状つば
４の外径は同一の径とする。上杭１ａに取付けられるら
せん状つば５の径は、下杭に取付けられているらせん状
つばの径よりも大きくする。At the tip of the lower pile 1b, a bottom plate 2, an excavating claw 3, and a spiral collar 4 are attached. The bottom plate 2 is attached so as to close the tip of the pile in order to secure the tip supporting force of the pile. The outer diameter of the helical collar 4 is about twice the outer diameter of the pile body. Spiral collars 4 are attached at predetermined intervals in the middle of the pile. Spiral collar 4
The doughnut-shaped iron plate whose one end is open is twisted to form a substantially spiral shape, and is joined to the pile body by welding. The outer diameter of the spiral flange 4 attached to the lower pile 1b is the same. The diameter of the spiral collar 5 attached to the upper pile 1a is larger than the diameter of the spiral collar attached to the lower pile.
【００１２】図２は、他の一例を示したもので、上杭１
ａに取付けられているらせん状つばの一部に、下杭に取
付けられているものと同じ径のものがある例を示してい
る。なお、上杭１ａに取付けられているらせん状つば
は、下杭に取付けられているらせん状つばの径よりも大
きいものであれば、種々の大きさの径のものを設けるこ
とができる。図３は、さらに他の一例を示したもので、
上杭１ａと下杭１ｂとの間に中間杭１ｃが存在する例を
示している。中間杭１ｃは、必要に応じて複数本用いる
ことができる。図示されていないが、下杭を最下端のみ
１個所にらせん状つばが設けられたものとすることもで
きる。上杭のらせん状つば４を省略することもできる。FIG. 2 shows another example.
An example is shown in which a part of the spiral collar attached to a has the same diameter as that attached to the lower pile. The helical collar attached to the upper pile 1a may be of various sizes as long as it is larger than the helical collar attached to the lower pile. FIG. 3 shows still another example.
An example in which an intermediate pile 1c exists between the upper pile 1a and the lower pile 1b is shown. A plurality of intermediate piles 1c can be used as necessary. Although not shown, the lower pile may be provided with a helical collar at only one position at the lowermost end. The spiral collar 4 of the upper pile may be omitted.
【００１３】本発明の構造の杭を施工するにあたって
は、下杭を所定の杭心位置に建て込んでから、施工機械
により回転力を与え、土中にねじり込んでいく。通常、
複数本の杭を継いで用いるため、前述したように、アー
ク溶接やネジ式継手等で次の杭を接続して埋設する。最
終的に、一番上に用いる上杭を接続して埋設し、施工終
了となる。上杭に取付けられているらせん状つばは、そ
れより下の杭に取付けられているらせん状つばよりも外
径が大きくなっているが、回転力により同様に地盤中に
ねじり込まれていくものである。In constructing the pile having the structure of the present invention, the lower pile is erected at a predetermined center of the pile, and then a turning force is applied by a construction machine to twist the pile into the soil. Normal,
In order to connect and use a plurality of piles, as described above, the next pile is connected and buried by arc welding or a threaded joint. Finally, the upper pile used at the top is connected and buried, and the construction is completed. The helical collar attached to the upper pile has a larger outer diameter than the helical collar attached to the lower pile, but is also screwed into the ground by rotational force. It is.
【００１４】[0014]
【発明の効果】本発明の継杭構造は、次のような優れた
効果を発揮する。 （１）地表面付近に設置される上杭のらせん状つばが、
それよりも下の杭のらせん状つばよりも大径であるた
め、地表面付近であっても大きな摩擦力を取ることがで
きる。 （２）上杭の部分だけらせん状つばの径を大きくしてお
けばよく、下から上に向って徐々に拡径する必要がな
い。従って、杭の貫入抵抗が小さくなり、施工が容易に
なる。さらに、らせん状つばの加工も、一定割合で拡大
する場合に比べて単純になり、杭の製造が簡単になる。The joint pile structure of the present invention exhibits the following excellent effects. (1) The spiral collar of the upper pile installed near the ground surface,
Since it has a larger diameter than the spiral flange of the pile below it, it can take a large frictional force even near the ground surface. (2) It is sufficient that the diameter of the spiral collar is increased only in the upper pile portion, and there is no need to gradually increase the diameter from bottom to top. Therefore, the penetration resistance of the pile is reduced, and the construction is facilitated. Furthermore, the processing of the helical collar is simpler than the case where the helical collar is enlarged at a fixed rate, and the manufacture of the pile is simplified.
【図１】本発明の継杭構造の一例の立面図である。FIG. 1 is an elevation view of an example of a joint pile structure according to the present invention.
【図２】本発明の継杭構造の他の一例の立面図である。FIG. 2 is an elevation view of another example of the joint pile structure of the present invention.
【図３】本発明において、中間杭がある継杭構造の一例
の立面図である。FIG. 3 is an elevation view of an example of a joint pile structure having an intermediate pile in the present invention.
１ 杭本体 １ａ 上杭 １ｂ 下杭 １ｃ 中間杭 ２ 底板 ３ 掘削爪 ４ らせん状つば ５ らせん状つば（大径） ６ 継手部 DESCRIPTION OF SYMBOLS 1 Pile main body 1a Upper pile 1b Lower pile 1c Intermediate pile 2 Bottom plate 3 Drilling claw 4 Helical collar 5 Helical collar (large diameter) 6 Joint part
Claims (2)
を閉塞する底板と、掘削爪が設けられ、外周面にらせん
状つばが少なくとも１個設けられており、かつ、該らせ
ん状つばの径が同一である鋼管製の下杭、及び、（Ｂ）
外周面にらせん状つばが少なくとも１個設けられてお
り、該らせん状つばの径が、該下杭に設けられたらせん
状つばの径と同一か又はそれよりも大であり、かつ、該
らせん状つばの少なくとも１個の径が、該下杭に設けら
れたらせん状つばの径よりも大である鋼管製の上杭を構
成要素とする鋼管製の継杭構造。(A) A bottom plate for closing at least a tip end of a pile and an excavation claw are provided at a lowermost end portion, and at least one spiral collar is provided on an outer peripheral surface, and the spiral collar is provided. Lower pile made of steel pipes having the same diameter, and (B)
At least one helical collar is provided on the outer peripheral surface, the diameter of the helical collar is equal to or larger than the diameter of the helical collar provided on the lower pile, and the helical collar is provided. A steel pipe joint pile structure comprising a steel pipe upper pile in which at least one diameter of the collar is larger than the diameter of the spiral collar provided on the lower pile.
を有することを特徴とする請求項１記載の鋼管製の継杭
構造。2. The steel pipe joint pile structure according to claim 1, further comprising an intermediate pile between (A) a lower pile and (B) an upper pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5047798A JPH11247189A (en) | 1998-03-03 | 1998-03-03 | Spliced pile structure made of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5047798A JPH11247189A (en) | 1998-03-03 | 1998-03-03 | Spliced pile structure made of steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11247189A true JPH11247189A (en) | 1999-09-14 |
Family
ID=12859991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5047798A Pending JPH11247189A (en) | 1998-03-03 | 1998-03-03 | Spliced pile structure made of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11247189A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001317050A (en) * | 2000-03-03 | 2001-11-16 | Asahi Kasei Corp | Forming method for soil cement composite pile |
| JP2002348860A (en) * | 2001-05-28 | 2002-12-04 | Daiwa House Ind Co Ltd | Pile with blade |
| JP2003082658A (en) * | 2001-09-12 | 2003-03-19 | Asahi Kasei Corp | Partially constructed soil cement composite pile |
| JP2003082659A (en) * | 2001-09-12 | 2003-03-19 | Asahi Kasei Corp | Enlarged wing attached soil cement composite pile |
| WO2010116878A1 (en) * | 2009-04-10 | 2010-10-14 | 新日鉄エンジニアリング株式会社 | Steel pipe pile and method of installing steel pipe pile |
| WO2010116884A1 (en) * | 2009-04-10 | 2010-10-14 | 新日鉄エンジニアリング株式会社 | Steel pipe pile and method of installing steel pipe pile |
| KR101191286B1 (en) | 2012-09-06 | 2012-10-16 | 주식회사 에코탑 | The method of a dual helical pile for increasing upper skin friction |
| JP2014125789A (en) * | 2012-12-26 | 2014-07-07 | Kajima Corp | Foundation pile construction method and foundation structure |
| JP2019132099A (en) * | 2018-02-02 | 2019-08-08 | 日本製鉄株式会社 | Slope reinforcement pile, slope reinforcement method and slope reinforcement pile construction method |
-
1998
- 1998-03-03 JP JP5047798A patent/JPH11247189A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001317050A (en) * | 2000-03-03 | 2001-11-16 | Asahi Kasei Corp | Forming method for soil cement composite pile |
| JP4626916B2 (en) * | 2000-03-03 | 2011-02-09 | 旭化成建材株式会社 | Construction method of soil cement composite pile |
| JP2002348860A (en) * | 2001-05-28 | 2002-12-04 | Daiwa House Ind Co Ltd | Pile with blade |
| JP2003082659A (en) * | 2001-09-12 | 2003-03-19 | Asahi Kasei Corp | Enlarged wing attached soil cement composite pile |
| JP2003082658A (en) * | 2001-09-12 | 2003-03-19 | Asahi Kasei Corp | Partially constructed soil cement composite pile |
| JP4641369B2 (en) * | 2001-09-12 | 2011-03-02 | 旭化成建材株式会社 | Partially built soil cement composite pile |
| WO2010116878A1 (en) * | 2009-04-10 | 2010-10-14 | 新日鉄エンジニアリング株式会社 | Steel pipe pile and method of installing steel pipe pile |
| WO2010116884A1 (en) * | 2009-04-10 | 2010-10-14 | 新日鉄エンジニアリング株式会社 | Steel pipe pile and method of installing steel pipe pile |
| JP5518050B2 (en) * | 2009-04-10 | 2014-06-11 | 新日鉄住金エンジニアリング株式会社 | Steel pipe pile and steel pipe pile construction method |
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| KR101191286B1 (en) | 2012-09-06 | 2012-10-16 | 주식회사 에코탑 | The method of a dual helical pile for increasing upper skin friction |
| JP2014125789A (en) * | 2012-12-26 | 2014-07-07 | Kajima Corp | Foundation pile construction method and foundation structure |
| JP2019132099A (en) * | 2018-02-02 | 2019-08-08 | 日本製鉄株式会社 | Slope reinforcement pile, slope reinforcement method and slope reinforcement pile construction method |
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