JP2002061173A - Precast pile with enlarged head - Google Patents

Precast pile with enlarged head

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Publication number
JP2002061173A
JP2002061173A JP2001162029A JP2001162029A JP2002061173A JP 2002061173 A JP2002061173 A JP 2002061173A JP 2001162029 A JP2001162029 A JP 2001162029A JP 2001162029 A JP2001162029 A JP 2001162029A JP 2002061173 A JP2002061173 A JP 2002061173A
Authority
JP
Japan
Prior art keywords
pile
diameter
pile body
small
joint
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
Application number
JP2001162029A
Other languages
Japanese (ja)
Inventor
Akira Itaya
彰 板谷
Masahiko Miyazaki
雅彦 宮崎
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.)
Asahi Kasei Corp
Original Assignee
Asahi Kasei Corp
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 Asahi Kasei Corp filed Critical Asahi Kasei Corp
Priority to JP2001162029A priority Critical patent/JP2002061173A/en
Publication of JP2002061173A publication Critical patent/JP2002061173A/en
Pending legal-status Critical Current

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  • Piles And Underground Anchors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a deformed precast pile with an enlarged head having a small-diameter lower pile body integrally connected to the upper end of a large-diameter upper pile body, particularly assuring firm junction of these and achieving economical mass production with no waste and a lighter weight. SOLUTION: The precast pile with the enlarged head comprises a joint steel material 4 having a downward taper 8 on the lower outer periphery with its lower end 13 rounded and having a thickness (a) at a portion to be in contact with the small-diameter lower pile body 3, laid between the large-diameter upper pile body 2 and the small-diameter lower pile body 3, and ring notched grooves 9 provided in the outer periphery junction parts thereof, the ring notched groves 9 being subjected to welding 10.

Description

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

【0001】[0001]

【発明の属する利用分野】本発明は上部の構造物から大
きな水平力や曲げモーメントが杭頭に作用するような場
合にも、杭本数を増やしたり或は杭径を大きくすること
なく経済的に対応することが出来る上部が大径で下部が
小径の拡頭既製杭に係り、特に大径上部杭体と小径下部
杭体とを所定の板厚を有する継手鋼材を介して相互に連
結して構成した拡頭既製杭に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is economical without increasing the number of piles or increasing the diameter of piles even when a large horizontal force or bending moment acts on the pile head from the upper structure. The upper part which can correspond is related to the enlarged prefabricated pile with the upper part having a large diameter and the lower part having a small diameter. In particular, the large-diameter upper pile body and the small-diameter lower pile body are interconnected via a joint steel material having a predetermined thickness. This is related to the expanded prefabricated pile.

【0002】[0002]

【従来の技術】従来、拡頭杭に関する公知技術は、例え
ば実公昭63−2509号公報(第1公知技術)、特開
昭52−7109号公報(第2公知技術)、特開昭58
−27366号公報(第3公知技術)及び特開2000
−73365号公報(第4公知技術)或いは特開平11
−181759号公報(第5公知技術)等が知られてい
る。
2. Description of the Related Art Conventionally, known techniques relating to a head expansion pile are disclosed in, for example, Japanese Utility Model Publication No. Sho 63-2509 (first known technique), Japanese Patent Laid-Open Publication No. 52-7109 (second known technique), and Japanese Patent Laid-Open Publication No. 58-58.
-27366 (third known technology) and JP-A-2000-2000
-73365 (fourth known technology) or
No. 181759 (fifth known technology) is known.

【0003】前記第1公知技術は、大径上部コンクリー
ト杭と小径下部コンクリート杭とを、下部に行くに従っ
て外径が漸減するテーパー継手部材を介して相互に連結
して構成した異コンクリート杭に関する技術である。
[0003] The first publicly known technique relates to a different concrete pile formed by connecting a large diameter upper concrete pile and a small diameter lower concrete pile to each other via a tapered joint member whose outer diameter gradually decreases toward the bottom. It is.

【0004】前記第2公知技術は、異径の鋼管杭の打込
み工法に関する技術であり、大径上筒の下端に小径下筒
管を連結した接手兼打込金具を使用し、該小径下筒管を
小径下部杭の上端中空部に挿入し、かつ該大径上筒管の
中に大径上部杭を挿入し、この状態で上下部の鋼管杭を
打込みながら地中で相互に連接する工法の技術である。
The second known technique relates to a driving method of a steel pipe pile having a different diameter, and uses a joint and driving fitting in which a small-diameter lower cylinder pipe is connected to a lower end of a large-diameter upper cylinder, and the small-diameter lower cylinder is used. A method in which a pipe is inserted into the upper end hollow portion of a small-diameter lower pile, and a large-diameter upper pile is inserted into the large-diameter upper cylindrical pipe, and in this state, the steel pipe piles at the upper and lower parts are connected to each other in the ground while driving. Technology.

【0005】前記第3公知技術は、大径上部鋼管杭の下
端部に小径下部鋼管杭の頭部を挿入すると共に、これ等
を数個の連結片を介して相互に連結し、更に大径スクリ
ューオーガーの下端に小径スクリューオーガーを連結し
てなる泥土かく拌掘削機を前記上下部の鋼管杭内に挿入
して掘削作業を行うようにした装置に関する技術であ
る。
According to the third known technique, a head of a small-diameter lower steel pipe pile is inserted into a lower end portion of a large-diameter upper steel pipe pile, and these are connected to each other through several connecting pieces to form a large-diameter upper steel pipe pile. The present invention relates to a technique relating to a device in which a mud-stirring excavator in which a small-diameter screw auger is connected to a lower end of a screw auger is inserted into the upper and lower steel pipe piles to perform excavation work.

【0006】前記第4公知技術は、ねじ込み式鋼管杭及
びその施工方法に関する技術であって、大径上部鋼管の
下端部に小径下部鋼管を嵌入し、両者を溶着することに
よって連結した鋼管杭と、このように構成された異径杭
の中にかく拌掘削用オーガーを挿入して回転させながら
施工する工法に関するものである。
The fourth known technique relates to a screw-in type steel pipe pile and a method for constructing the same. A small-diameter lower steel pipe is fitted into a lower end of a large-diameter upper steel pipe, and the steel pipe pile is connected by welding the two. The present invention also relates to a construction method in which an auger for agitating and excavating is inserted into a different-diameter pile having the above-described structure, and the auger is rotated and constructed.

【0007】前記第5公知技術は、大径上部鋼管の下端
部に小径下部鋼管を鋼板製リング状部材を介して溶接に
よって連結する異形鋼管杭の構造である。特に上下の鋼
管を同軸に一体連結することを特徴とし、前記上部鋼管
とリング状部材とは、両者の外周面で溶着固定し、下部
鋼管とリング状部材とは、リング状部材の下面(裏面)
と下部鋼管の上縁とを溶着固定することによって相互に
固定している。
[0007] The fifth known technique is a structure of a deformed steel pipe pile in which a small diameter lower steel pipe is connected to a lower end of a large diameter upper steel pipe by welding via a steel plate ring-shaped member. In particular, the upper and lower steel pipes are integrally connected coaxially, the upper steel pipe and the ring-shaped member are welded and fixed on the outer peripheral surfaces of both, and the lower steel pipe and the ring-shaped member are connected to the lower surface (the back surface) of the ring-shaped member. )
And the upper edge of the lower steel pipe are fixed to each other by welding.

【0008】[0008]

【発明が解決しようとする課題】然るに、前記第1公知
技術に於ては、極めて特殊な形状を有するテーパー継手
部材を必要とするので、コスト高になり、経済的でない
等の問題があった。前記第2公知技術は、大径上筒管と
小径下筒管とよりなる接手兼打込金具を使用するので、
杭の地中元の打込み時には有効ではあるが、上下の杭を
確実に接合して拡頭既製杭を構成することは困難であっ
た。
However, the first prior art requires a tapered joint member having a very special shape, which raises costs and is not economical. . Since the second known technique uses a joint and driving fitting composed of a large-diameter upper cylindrical pipe and a small-diameter lower cylindrical pipe,
Although effective when driving piles underground, it was difficult to reliably connect the upper and lower piles to form an expanded prefabricated pile.

【0009】また、前記第3公知技術は、大径上部鋼管
杭の下端部に小径下部鋼管杭の頭部を挿入し、これ等を
数個の連結片で相互に連結しているが、上下の杭の接合
が不安定であると共に、接合時の溶接作業が困難である
等の問題があった。
In the third known technique, a head of a small diameter lower steel pipe pile is inserted into a lower end of a large diameter upper steel pipe pile and these are connected to each other by several connecting pieces. However, there were problems such as that the joining of the piles was unstable and that welding work at the time of joining was difficult.

【0010】かつ、前記第4公知技術は、大径上部鋼管
の下端部に小径下部鋼管をはめ込んで、両者を相互に溶
接する方法であるので、前記第3公知技術と同様に上下
の杭の接合が不安定であり、かつ接合時の溶接作業が困
難である問題があった。また、この第4公知技術の一部
に接合時のリング状の接続部材を用いる例も例示されて
いるが、この場合には溶接面が少なく不安定であり、か
つ上向きの溶接作業が必要になるので、現場での連結作
業は極めて困難である問題があった。
The fourth known technique is a method in which a small-diameter lower steel pipe is fitted into the lower end of a large-diameter upper steel pipe and the two are welded to each other. There was a problem that joining was unstable and welding work at the time of joining was difficult. In addition, although an example of using a ring-shaped connecting member at the time of joining is also illustrated as a part of the fourth known technique, in this case, the welding surface is small and unstable, and an upward welding operation is required. Therefore, there has been a problem that connecting work on site is extremely difficult.

【0011】更に、第5公知技術は、前述のように、大
径の上部鋼管と小径下部鋼管をリング状部材で連結する
構造であるが、この技術は前述の第4公知技術の一部に
既に記載された技術であり、溶接面が少なく不安定であ
り、かつ上向きの溶接作業が必要になるので、現場での
連結作業が極めて困難である問題があった。
Further, the fifth known technique has a structure in which a large-diameter upper steel pipe and a small-diameter lower steel pipe are connected by a ring-shaped member as described above. This technique is a part of the fourth known technique. This is a technique already described, and has a problem that it is extremely difficult to connect on site because the welding surface is small and unstable, and an upward welding operation is required.

【0012】本発明に係る拡頭既製杭は、前述の多くの
問題点に鑑み開発された全く新しい技術であって、特に
所定の板厚を有する継手鋼材を大径上部杭体の下端と小
径下部杭体の上端との間に介在させ、これ等の上下の杭
体を夫々継手鋼材に溶着することによって、上下の杭体
を相互に強固に連結して拡頭既製杭を構成する技術を提
供するものである。
The prefabricated prefabricated pile according to the present invention is a completely new technology developed in view of the above-mentioned many problems. In particular, a joint steel material having a predetermined plate thickness is formed by combining a lower end of a large-diameter upper pile body and a small-diameter lower part. Provided is a technique for constructing an expanded prefabricated pile by firmly connecting the upper and lower pile bodies to each other by interposing the upper and lower pile bodies between the upper end of the pile body and welding these upper and lower pile bodies to a joint steel material. Things.

【0013】[0013]

【課題を解決するための手段】前述の従来技術に於いて
は、上部の構造物から大きい水平力や曲げモーメントが
杭頭に作用した場合、杭に作用する鉛直力と水平力・曲
げモーメントの組合わせによっては杭本数を増やした
り、杭径を大きくして対応してきた。これに対して、本
発明に於いては、大径上部杭体と小径下部杭体とを所定
の板厚を有する継手鋼材を介して相互に溶着して構成す
ることによって、杭本数を増やしたり、杭径を大きくす
ることなく経済的な設計を可能とした技術である。
In the prior art described above, when a large horizontal force or bending moment acts on the pile head from the upper structure, the vertical force acting on the pile and the horizontal force / bending moment are reduced. Depending on the combination, the number of piles has been increased or the diameter of the piles has been increased. On the other hand, in the present invention, the number of piles can be increased by forming the large-diameter upper pile body and the small-diameter lower pile body by welding each other via a joint steel material having a predetermined plate thickness. This technology enables economical design without increasing the pile diameter.

【0014】特に、杭先端に取付けた袋体にセメントミ
ルクを注入し高支持力を発現する工法や、杭先端部地盤
を拡大掘削し、杭径に比して従来の工法よりも高支持力
を発現させる工法には有効である。杭体に作用する応力
度では、最も効果的な場合は長期鉛直応力が100kg
/cm2以上となる場合が有効である。
In particular, a construction method in which cement milk is injected into a bag attached to the tip of the pile to achieve high bearing capacity, or a method in which the ground at the tip of the pile is enlarged and excavated to provide a higher bearing capacity than the conventional construction method compared to the pile diameter It is effective for the construction method of expressing In the most effective case, the long-term vertical stress is 100 kg.
/ Cm 2 or more is effective.

【0015】本発明に係る拡頭既製杭は、前述の多くの
公知技術の夫々の問題点を根本的に改善した発明であっ
て、その第1発明の要旨は、大径上部杭体の下端に小径
下部杭体を連結して構成してなる拡頭既製杭に於て、前
記大径上部杭体と小径下部杭体とを所定の板厚を有する
継手鋼材を介して相互に溶着して構成したことを特徴と
した拡頭既製杭である。
The prefabricated prefabricated pile according to the present invention is an invention which fundamentally improves each of the problems of the above-mentioned many known techniques, and the gist of the first invention is that the pile at the lower end of the large-diameter upper pile body is provided. In an enlarged prefabricated pile formed by connecting small diameter lower piles, the large diameter upper pile and the small diameter lower pile are welded to each other via a joint steel material having a predetermined plate thickness. This is an enlarged prefabricated pile with the following features.

【0016】前記第1発明に於ては、前述のように拡頭
杭を構成する大径上部杭体と小径下部杭体とを所定の板
厚を持った継手鋼材を介して相互に溶着して構成したの
で、全体の構成が極めて単純であると共に、上下の杭を
安定した状態で強固に連結することが出来る。
In the first aspect of the present invention, the large-diameter upper pile and the small-diameter lower pile constituting the head pile are welded to each other via a joint steel material having a predetermined thickness. With this configuration, the overall configuration is extremely simple, and the upper and lower piles can be firmly connected in a stable state.

【0017】本発明の拡頭既製杭の第2発明に要旨は、
前記継手鋼材の小径下部杭体に当接される部分の板厚a
の寸法が下式
The gist of the second invention of the expanded ready-made pile of the present invention is as follows.
Plate thickness a of the portion of the joint steel material that comes into contact with the small diameter lower pile body
The dimensions of

【数1】 (Equation 1)

【0018】を満足させる数値であることを特徴とした
第1発明の拡頭既製杭である。
A prefabricated head pile according to the first aspect of the present invention, which is a numerical value satisfying the following.

【0019】前記第2発明に於ては、前述のように、継
手鋼材の小径下部杭体に当接される部分の板厚aを前述
のような式を満足させる数値にして、継手鋼材を構成し
たので、所望の強度と無駄のない経済的な寸法を有する
継手鋼材を用いて上下の杭を強固に一体的に連結するこ
とが出来る。
In the second aspect of the present invention, as described above, the thickness of the portion of the joint steel material abutting on the small-diameter lower pile body is set to a numerical value satisfying the above-described equation, and the joint steel material is manufactured. With this configuration, the upper and lower piles can be strongly and integrally connected using a joint steel material having desired strength and economical dimensions without waste.

【0020】本発明の拡頭既製杭の第3発明に要旨は、
前記継手鋼材の下部外周壁に下向テーパーを設けて構成
したことを特徴とした第1発明或は第2発明の拡頭既製
杭である。
The gist of the third invention of the expanded prefabricated pile of the present invention is as follows.
The expanded prefabricated pile according to the first invention or the second invention, wherein a downward taper is provided on a lower outer peripheral wall of the joint steel material.

【0021】前記第3発明に於ては、前述のように、前
記継手鋼材の下部外周壁に下向テーパーを設けて構成し
たので、継手鋼材の不要部分を無くして、継手鋼材をコ
ンパクトでかつ軽量に形成することが出来る。また、こ
のように構成された継手鋼材を用いて大径上部杭体と小
径下部杭体とを接合させることによって、スマートで体
裁が良くかつ地中にスムーズに打設し得る拡頭既製杭を
構成することが出来る。さらに、継手鋼材と小径下部杭
体との溶接を容易にしている。
In the third aspect of the present invention, as described above, since the lower outer peripheral wall of the joint steel is provided with a downward taper, unnecessary portions of the joint steel are eliminated, and the joint steel is made compact and compact. It can be made lightweight. In addition, by joining the large-diameter upper pile body and the small-diameter lower pile body using the joint steel material configured in this way, a prefabricated prefabricated pile that is smart, has good appearance, and can be smoothly driven into the ground is constructed. You can do it. Further, welding between the joint steel material and the small diameter lower pile body is facilitated.

【0022】本発明の拡頭既製杭の第4発明に要旨は、
前記継手鋼材と大径上部杭体との接合部或は該継手鋼材
と小径下部杭体との接合部に沿ってリング状切欠溝を設
けると共に、このリング状の切欠溝に溶接を施すことに
よって、継手鋼材に大径上部杭体或は小径下部杭体を結
合させて構成したことを特徴とした第1発明乃至第3発
明の拡頭既製杭である。
The gist of the fourth invention of the prefabricated pile of the present invention is as follows.
By providing a ring-shaped notch along the joint between the joint steel material and the large-diameter upper pile or the joint between the joint steel and the small-diameter lower pile, and welding the ring-shaped notch by welding. An enlarged prefabricated pile according to any one of the first to third inventions, characterized in that a large diameter upper pile body or a small diameter lower pile body is connected to a joint steel material.

【0023】前記第4発明に於ては、前述のように、継
手鋼材とこれに接合される上下の杭体との接合部に沿っ
てリング状切欠溝を設けて構成したので、このリング状
切欠溝に溶接を施して両者を強固に接合することが出来
る。特に前記リング状切欠溝を接合部に沿って設けるこ
とによって、両者の溶接面積を大きく取ることが出来る
と共に、溶接の跡が接合部の外方に大きく突出すること
を防止出来る。
In the fourth aspect of the invention, as described above, the ring-shaped notch groove is provided along the joint between the joint steel material and the upper and lower piles joined thereto, so that the ring-shaped notch is provided. By welding the notch groove, the two can be firmly joined. In particular, by providing the ring-shaped notch groove along the joint, it is possible to increase the welding area of both, and to prevent the trace of welding from protruding largely outside the joint.

【0024】[0024]

【発明の実施の形態】図により本発明に係る拡頭既製杭
の一実施例を具体的に説明すると、図1は本発明に係る
拡頭既製杭の外観を示す側面図、図2は図1の拡頭既製
杭の要部の断面説明図、図3は図2の拡頭既製杭の要部
をさらに拡大した断面説明図、図4は夫々他例の拡頭既
製杭の要部の断面説明図である。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing the appearance of an enlarged prefabricated pile according to the present invention; FIG. FIG. 3 is a cross-sectional explanatory view of a main part of the pre-expanded prefabricated pile, FIG. 3 is a cross-sectional explanatory view of a further enlarged main part of the pre-expanded prefabricated pile of FIG. 2, and FIG. .

【0025】図1乃至図3に於て、1は本発明に係る拡
頭既製杭であって、後述の大径上部杭体2と小径下部杭
体3とこれ等を相互に連絡する継手鋼材4とより構成さ
れている。前記大径上部杭体2は外殻鋼管付きコンクリ
ート杭(SC杭)で構成されている。
In FIG. 1 to FIG. 3, reference numeral 1 denotes a head-expanded ready-made pile according to the present invention, which is a large-diameter upper pile 2 and a small-diameter lower pile 3, which are described later, and a joint steel member 4 for interconnecting them. It is composed of The large-diameter upper pile 2 is constituted by a concrete pile (SC pile) with an outer shell steel pipe.

【0026】前記小径下部杭体3は大径上部杭体2より
小径であって、SC杭で構成されている。この小径下部
杭体3の上端縁には端板5が溶接6によって予め一体的
に固定されている。
The small-diameter lower pile 3 has a smaller diameter than the large-diameter upper pile 2, and is composed of SC piles. An end plate 5 is integrally fixed to an upper end edge of the small diameter lower pile body 3 by welding 6 in advance.

【0027】前記継手鋼材4はリング状の鋼板より形成
されており、この継手鋼材4の中心上部縁には切欠凹部
7が形成され、かつ該継手鋼材4の下部外周壁には下向
テーパー8が形成されている。
The joint steel member 4 is formed of a ring-shaped steel plate. The joint steel member 4 has a cutout recess 7 formed at the upper center edge thereof, and the lower outer peripheral wall of the joint steel member 4 has a downward taper 8. Are formed.

【0028】前記切欠凹部7と下向テーパー8とは夫々
継手鋼材4の不要部分を無くして経済的にし、かつ軽量
に構成することを目的としている。また、該下向テーパ
ー8は、その上に拡頭既製杭1の継ぎ手部の形状をスマ
ートにすると共に、拡頭既製杭1を地中にスムーズに打
設することが出来るように構成されている。更に、この
下向テーパー8によって継手鋼材4と小径下部杭体3と
の溶接を容易にしている。
The notch recess 7 and the downward taper 8 are intended to be economical and light in weight by eliminating unnecessary portions of the joint steel material 4, respectively. Further, the downward taper 8 is configured so that the shape of the joint portion of the pre-expanded prefabricated pile 1 can be made smart thereon, and the pre-expanded prefabricated pile 1 can be smoothly driven into the ground. Further, welding of the joint steel material 4 and the small diameter lower pile 3 is facilitated by the downward taper 8.

【0029】次に、本発明に使用される前述の継手鋼材
4は、後述のように大径上部杭体2と小径下部杭体3と
を強固に連結することが出来、かつその材料に無駄がな
く、しかも全体の重さを軽量にすることが出来るように
構成されている。
Next, the above-mentioned joint steel material 4 used in the present invention can firmly connect the large-diameter upper pile body 2 and the small-diameter lower pile body 3 as will be described later, and the material is wasted. It is configured so that the weight of the entire vehicle can be reduced.

【0030】従って、この目的を達成するために、継手
鋼材4の所定の場所の板厚、即ち小径下部杭体3の外周
面に当接される部分の板厚aが、下式を満足させる数値
になるように構成されている。
Accordingly, in order to achieve this object, the thickness of the joint steel material 4 at a predetermined location, that is, the thickness a of the portion contacting the outer peripheral surface of the small diameter lower pile 3 satisfies the following expression. It is configured to be a number.

【0031】[0031]

【数1】 (Equation 1)

【0032】前述の数式を使用して、杭鋼管厚t、大径
上部杭体径D1、小径下部杭体径D、大径上部杭体鋼管
の降伏応力度σsy1、継手鋼材の降伏応力度σsy2
に夫々具体的数値を挿入して計算した処、次項のような
結果が得られた。
Using the above equations, the pile steel pipe thickness t, the large diameter upper pile body diameter D 1 , the small diameter lower pile body diameter D, the yield stress degree σsy1 of the large diameter upper pile body steel pipe, the yield stress degree of the joint steel material σsy2
When the calculation was performed by inserting specific numerical values into the above, the following results were obtained.

【0033】[0033]

【数2】 (Equation 2)

【0034】以上の計算より、杭鋼管厚を0.9cmに
し、大径上部杭体径を70cmにし、小径上部杭体径を
60cmにし、大径上部杭体鋼管の降伏応力度と及び継
手鋼材の降伏応力度を夫々2,400kg/cm2にし
た場合には、継手鋼材4の小径下部杭体3の外周面に当
接される部分の板厚aは、2.6cm〜7.8cmにす
る必要があることが明らかとなった。また、特に図3に
例示するように、下向のテーパー部下端13にアール
(曲線部)を設けることにより、板厚αの寸法を小さく
することが出来る。
From the above calculations, the pile steel pipe thickness was set to 0.9 cm, the large diameter upper pile body diameter was set to 70 cm, the small diameter upper pile body diameter was set to 60 cm, the yield stress of the large diameter upper pile steel pipe, and the joint steel material. Is 2,400 kg / cm 2 , the plate thickness a of the portion of the joint steel material 4 that is in contact with the outer peripheral surface of the small diameter lower pile 3 is 2.6 cm to 7.8 cm. It became clear that we needed to do that. In addition, as shown in FIG. 3 in particular, by providing a radius (curved portion) at the lower end 13 of the downward tapered portion, the dimension of the plate thickness α can be reduced.

【0035】前述のような構成を有する継手鋼材4に大
径上部杭体2と小径下部杭体3とを夫々溶接するに当っ
ては、特に図3に示す如く、継手鋼材4とこれ等の大径
上部杭体2及び小径下部杭体3との外周の接合部に沿っ
て断面が横向V状になるようなリング状切欠溝(開先
溝)9を設け、このリング状切欠溝9内に溶接10を施
すことによって、両者を強固に結合させている。
In welding the large-diameter upper pile body 2 and the small-diameter lower pile body 3 to the joint steel member 4 having the above-described structure, respectively, as shown in FIG. A ring-shaped notch groove (groove groove) 9 having a V-shaped cross section is provided along the outer peripheral joint portion between the large-diameter upper pile body 2 and the small-diameter lower pile body 3. Are welded to each other so that they are firmly connected to each other.

【0036】特に、継手鋼材4の下部外周壁に下向テー
パー8を施すことによって、継手鋼材4の下縁と小径下
部杭体3の外周面をほぼ面一に揃えることが出来、これ
によって、両者の溶接10の作業が横向きに行うことが
出来、溶接作業を容易にしている。上記実施例に於て
は、大径上部杭体2に小径下部杭体3を連結する構成に
ついて説明したが、大径上部杭体2に小径中央部杭体
(図示せず)を連結する構成も全く同様に構成すること
が出来る。
In particular, by applying a downward taper 8 to the lower outer peripheral wall of the joint steel member 4, the lower edge of the joint steel member 4 and the outer peripheral surface of the small-diameter lower pile 3 can be substantially flush with each other. Both welding operations 10 can be performed sideways, facilitating the welding operation. In the above embodiment, the configuration in which the small-diameter lower pile body 3 is connected to the large-diameter upper pile body 2 has been described. However, the configuration in which the small-diameter central pile body (not shown) is connected to the large-diameter upper pile body 2. Can be configured in exactly the same way.

【0037】前述のように継手鋼材4と大径上部杭体2
及び小径下部杭体3との外周接合部に沿ってリング状切
欠溝9を設けた場合には、継手鋼材4と大径上部杭体2
及び小径下部杭体3との夫々の溶接面積を拡大すること
が出来、両者に強固でかつ確実な溶接を可能とすること
が出来る。また、溶接10がリング状切欠溝9内に於て
施こされるので、溶接10が継手鋼材4の外周面より外
方に大きく突出することを防止出来る。
As described above, the joint steel 4 and the large-diameter upper pile 2
When the ring-shaped notch groove 9 is provided along the outer peripheral joint with the small diameter lower pile 3, the joint steel 4 and the large diameter upper pile 2
In addition, it is possible to increase the welding area of each of the small-diameter lower pile body 3 and the small-diameter lower pile body 3, thereby enabling a strong and reliable welding to both. Further, since the weld 10 is formed in the ring-shaped notch groove 9, it is possible to prevent the weld 10 from protruding largely outside the outer peripheral surface of the joint steel 4.

【0038】前述の実施例に於ては、中心上部縁に切欠
凹部7を有する継手鋼材4について説明したが、図4
(a)に示す如く、切欠凹部7が設けられていない平板
リング状の鋼板で継手鋼材11を構成することも可能で
ある。さらに継手鋼材は、図4(b)に示す如く、径の
異なる2個のリング状鋼板12a、12bを接合した2
段状の継手鋼材12を使用することも出来る。
In the above-described embodiment, the joint steel member 4 having the notch recess 7 at the upper center edge has been described.
As shown in (a), it is also possible to configure the joint steel material 11 with a flat-plate ring-shaped steel plate in which the notch recess 7 is not provided. Further, as shown in FIG. 4 (b), the joint steel material is formed by joining two ring-shaped steel plates 12a and 12b having different diameters.
A stepped joint steel material 12 can also be used.

【0039】[0039]

【発明の効果】本発明に於ては、大径上部杭体と小径下
部杭体とを所定の板厚を持った継手鋼材を介して相互に
溶着して構成したので、構成が単純であり、かつ上下の
杭を安定して連結しかつ経済的に大量生産することが出
来る効果を有している。
According to the present invention, the large-diameter upper pile body and the small-diameter lower pile body are welded to each other via a joint steel material having a predetermined thickness, so that the construction is simple. Moreover, there is an effect that the upper and lower piles can be stably connected and mass-produced economically.

【0040】前記継手鋼材の所定部分の板厚を所定の数
式によって決定して構成した場合には、所望の強度と軽
量を有する無駄のない寸法を有する継手鋼材を用いて上
下の杭を一体的に連結して構成することが出来る効果を
有している。
In the case where the plate thickness of the predetermined portion of the joint steel is determined by a predetermined mathematical formula, the upper and lower piles are integrally formed by using a joint steel having a desired strength and light weight and having no waste. Has the effect of being able to be configured by being connected to.

【0041】また、継手鋼材の下部外周壁に下向テーパ
ーを設けた場合には、コンパクトで軽量な継手鋼材を形
成出来、かつ継手鋼材と小径下部杭体との溶接作業を容
易にすることが出来る。さらに、上下杭の接合部に段部
が形成されないので、拡頭既製杭を地中に打設すること
が出来る。特に前記下向きのテーパー部下端にアールを
設けた場合には、継手鋼材の板厚の寸法を小さくするこ
とが出来る。
When a downward taper is provided on the lower outer peripheral wall of the joint steel, a compact and lightweight joint steel can be formed, and the welding work between the joint steel and the small diameter lower pile body can be facilitated. I can do it. Further, since no step is formed at the joint between the upper and lower piles, the expanded prefabricated pile can be driven into the ground. In particular, when a radius is provided at the lower end of the downward tapered portion, the thickness of the joint steel material can be reduced.

【0042】さらに、継手鋼材と上下の杭の接合部にリ
ング状切欠溝を設けて、このリング状切欠溝に溶接を施
した場合には、溶接面積を大きく取ることが出来ると共
に溶接が接合部に大きく突出することを防止出来る等の
効果を有している。
Further, when a ring-shaped notch groove is provided at the joint between the joint steel material and the upper and lower piles and the ring-shaped notch groove is welded, a large welding area can be obtained and the welding can be performed at the joint. It has the effect of being able to prevent large protrusions.

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

【図1】本発明に係る拡頭既製杭の外観を示す側面図で
ある。
FIG. 1 is a side view showing the appearance of a head-expanded ready-made pile according to the present invention.

【図2】図1の拡頭既製杭の要部の断面説明図である。FIG. 2 is an explanatory sectional view of a main part of the prefabricated pile of FIG.

【図3】図2の拡頭既製杭の要部をさらに拡大した断面
説明図である。
FIG. 3 is an explanatory sectional view showing a further enlarged main part of the prefabricated pile of FIG. 2;

【図4】図4(A)、(B)は夫々他例の拡頭既製杭の
要部の断面説明図である。
FIGS. 4A and 4B are cross-sectional explanatory views of main parts of a head-expanded ready-made pile of another example.

【符号の説明】[Explanation of symbols]

1 拡頭既製杭 2 大径上部杭体 3 小径下部杭体 4 継手鋼材 5 端板 6 溶接 7 切欠凹部 8 下向テーパー 9 リング状切欠溝 10 溶接 11 継手鋼材 12 継手鋼材 12a、12b リング状鋼板 13 テーパー部下端 DESCRIPTION OF SYMBOLS 1 Expanded ready-made pile 2 Large diameter upper pile body 3 Small diameter lower pile body 4 Joint steel material 5 End plate 6 Welding 7 Notch recess 8 Downward taper 9 Ring notch groove 10 Welding 11 Joint steel material 12 Joint steel material 12a, 12b Ring steel plate 13 Taper lower end

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】大径上部杭体の下端に小径下部杭体を連結
して構成してなる拡頭既製杭に於て、前記大径上部杭体
と小径下部杭体とを所定の板厚を有する継手鋼材を介し
て相互に溶着して構成したことを特徴とした拡頭既製
杭。
An enlarged prefabricated pile constructed by connecting a small-diameter lower pile body to a lower end of a large-diameter upper pile body, wherein the large-diameter upper pile body and the small-diameter lower pile body have a predetermined thickness. An enlarged prefabricated pile, characterized by being mutually welded via a joint steel material having the same.
【請求項2】前記継手鋼材の小径下部杭体に当接される
部分の板厚aの寸法が下式 【数1】 を満足させる数値であることを特徴とした請求項1の拡
頭既製杭。
2. The dimension of the thickness a of the portion of the joint steel material that is in contact with the small diameter lower pile body is expressed by the following equation. The prefabricated expanded pile according to claim 1, wherein the value satisfies the following.
【請求項3】前記継手鋼材の下部外周壁に下向テーパー
を設けて構成したことを特徴とした請求項1或は請求項
2の拡頭既製杭。
3. The expanded prefabricated pile according to claim 1, wherein a downward taper is provided on a lower outer peripheral wall of the joint steel material.
【請求項4】前記継手鋼材と大径上部杭体との接合部或
は該継手鋼材と小径下部杭体との接合部に沿ってリング
状切欠溝を設けると共に、このリング状の切欠溝に溶接
を施すことによって、継手鋼材に大径上部杭体或は小径
下部杭体を結合させて構成したことを特徴とした請求項
1乃至請求項3の拡頭既製杭。
4. A ring-shaped notch groove is provided along a joint between the joint steel material and the large diameter upper pile body or a joint between the joint steel material and the small diameter lower pile body. 4. The prefabricated prefabricated pile according to claim 1, wherein a large diameter upper pile body or a small diameter lower pile body is joined to the joint steel by welding.
JP2001162029A 2000-06-05 2001-05-30 Precast pile with enlarged head Pending JP2002061173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001162029A JP2002061173A (en) 2000-06-05 2001-05-30 Precast pile with enlarged head

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000167121 2000-06-05
JP2000-167121 2000-06-05
JP2001162029A JP2002061173A (en) 2000-06-05 2001-05-30 Precast pile with enlarged head

Publications (1)

Publication Number Publication Date
JP2002061173A true JP2002061173A (en) 2002-02-28

Family

ID=26593289

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001162029A Pending JP2002061173A (en) 2000-06-05 2001-05-30 Precast pile with enlarged head

Country Status (1)

Country Link
JP (1) JP2002061173A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007285019A (en) * 2006-04-18 2007-11-01 Sumitomo Metal Ind Ltd Foundation pile structure and sc pile
JP2010242498A (en) * 2010-06-28 2010-10-28 Sumitomo Metal Ind Ltd Foundation pile structure
JP2020139283A (en) * 2019-02-27 2020-09-03 株式会社シグマベース Different diameter steel pipe pile connecting member and steel pipe pile using the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5485706U (en) * 1977-11-29 1979-06-18
JPS5524342U (en) * 1978-08-04 1980-02-16
JPS57133644U (en) * 1981-02-12 1982-08-20
JPH11181759A (en) * 1997-12-19 1999-07-06 Oak:Kk Steel pipe pile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5485706U (en) * 1977-11-29 1979-06-18
JPS5524342U (en) * 1978-08-04 1980-02-16
JPS57133644U (en) * 1981-02-12 1982-08-20
JPH11181759A (en) * 1997-12-19 1999-07-06 Oak:Kk Steel pipe pile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007285019A (en) * 2006-04-18 2007-11-01 Sumitomo Metal Ind Ltd Foundation pile structure and sc pile
JP4626562B2 (en) * 2006-04-18 2011-02-09 住友金属工業株式会社 Foundation pile structure and SC pile
JP2010242498A (en) * 2010-06-28 2010-10-28 Sumitomo Metal Ind Ltd Foundation pile structure
JP2020139283A (en) * 2019-02-27 2020-09-03 株式会社シグマベース Different diameter steel pipe pile connecting member and steel pipe pile using the same

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