JPH10252063A - Pile and method for supporting structure using the same - Google Patents

Pile and method for supporting structure using the same

Info

Publication number
JPH10252063A
JPH10252063A JP7070797A JP7070797A JPH10252063A JP H10252063 A JPH10252063 A JP H10252063A JP 7070797 A JP7070797 A JP 7070797A JP 7070797 A JP7070797 A JP 7070797A JP H10252063 A JPH10252063 A JP H10252063A
Authority
JP
Japan
Prior art keywords
steel pipe
pile
engaging
hole
reinforcing bar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7070797A
Other languages
Japanese (ja)
Inventor
Yasuyuki Uchiumi
康行 内海
Original Assignee
Atsugi Technos:Kk
株式会社アツギテクノス
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 Atsugi Technos:Kk, 株式会社アツギテクノス filed Critical Atsugi Technos:Kk
Priority to JP7070797A priority Critical patent/JPH10252063A/en
Publication of JPH10252063A publication Critical patent/JPH10252063A/en
Granted legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To enable a pile to be set so that it shows resistance only after displacement of a structure exceeds a certain amount and to protect grout packed between the surface of the pile and the ground. SOLUTION: A steel pipe 14 is inserted into a hole 20, and the lower part of reinforcement 16 is connected to the lower part of the steel pipe 14 by grout 18. In an earthquake, if the footing part 10 of the pier of a speedway, i.e., an existing structure, is displaced downward by an amount of displacement within an interval H1, an existing pile shows resistance. If the existing structure is displaced downward by the interval H1 or more, a flange 22 abuts to the lower surface 34A of the upper wall 34 of a recess 32, and only thereafter the steel pipe 14 shows resistance to compressive force. If the existing structure is displaced upward by an amount of displacement within an interval H2, the existing pile shows resistance. If the existing structure is displaced upward by the interval H2 or more, a bearing plate 32 abuts to the upper surface 34B of the upper wall 34, and only thereafter the reinforcement 16 shows resistance force to tensile force.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は構造物を支持する杭
に関し、更に、詳細には、耐震構造物の耐震補強用とし
て好適な杭及び杭による構造物の支持方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile for supporting a structure, and more particularly, to a pile suitable for seismic reinforcement of an earthquake-resistant structure and a method of supporting the structure with the pile.
【0002】[0002]
【従来の技術】耐震性能を向上させることを目的とし
て、直接基礎もしくは杭基礎を有する既設構造物に対し
て新設の杭を増設することは知られている。この場合、
地震時の既設構造物の振動に伴い、杭と構造物の接合点
において上下運動が生じ、杭に圧縮力と引っ張り力が作
用する。従来の構造では、杭と構造物の接合が剛結され
ているため、杭は既設構造物の振動による変形に追従し
て変形し、杭に圧縮力と引っ張り力が作用する。そして
杭により圧縮力と引っ張り力に対する抵抗力が発揮され
る。
2. Description of the Related Art It is known to add a new pile to an existing structure having a direct foundation or a pile foundation for the purpose of improving seismic performance. in this case,
With the vibration of the existing structure during the earthquake, vertical movement occurs at the joint between the pile and the structure, and a compressive force and a tensile force act on the pile. In the conventional structure, since the connection between the pile and the structure is rigidly connected, the pile deforms following the deformation of the existing structure due to vibration, and a compressive force and a tensile force act on the pile. And the pile exerts resistance to compression and tension.
【0003】[0003]
【発明が解決しようとする課題】このため従来の構造で
は、構造物のある変位量を越えた時点から初めて杭に抵
抗力を発揮させるように設定することができない問題が
ある。また、地震時、杭の表面と地盤との境界面におい
て圧縮力と引っ張り力の双方が発生するため、境界面に
グラウト注入材を充填し、地盤に対する杭の摩擦力を高
めようとしても、グラウト注入材は引っ張り抵抗が小さ
いためグラウト注入材にひび割れ等が生じ杭の抵抗力が
低下する。本発明は前記事情に鑑み案出されたものであ
って、本発明の目的は、構造物のある変位量を越えた時
点から初めて杭に抵抗力を発揮させるように設定でき、
また、杭の表面と地盤との境界面にグラウト注入材を充
填した場合であってもこのグラウト注入材を保護できる
杭及び杭により構造物を支持する方法を提供することに
ある。
For this reason, in the conventional structure, there is a problem that it is not possible to set the pile to exert the resisting force only after a certain amount of displacement of the structure is exceeded. In addition, during an earthquake, both compressive and tensile forces are generated at the interface between the pile surface and the ground.Therefore, even if grout is injected into the interface to increase the frictional force of the pile against the ground, Since the injected material has low tensile resistance, cracks and the like occur in the grout injected material, and the resistance of the pile decreases. The present invention has been devised in view of the above circumstances, and an object of the present invention can be set so that a pile exerts a resistance for the first time from a time when a structure exceeds a certain displacement amount,
Another object of the present invention is to provide a pile capable of protecting the grout-injected material even when the grout-injected material is filled in a boundary surface between the surface of the pile and the ground, and a method of supporting a structure by the pile.
【0004】[0004]
【課題を解決するための手段】前記目的を達成するため
本発明は、地盤に掘削された穴に挿入された鋼管と、前
記鋼管の内部に挿入された鉄筋とを備え、前記鋼管はそ
の外周面が穴の内壁に密着され、前記鉄筋はその下部が
鋼管の下部に位置されると共にその上端が鋼管の上端よ
りも上方に突出されて配置され、前記鋼管の少なくとも
下部と鉄筋の下部は鋼管の内部に注入されたグラウトに
より連結され、前記穴の上に位置する構造物側と鋼管の
上端とは、鋼管に圧縮力のみが作用するように第1の連
結手段で連結され、更に、前記構造物側と鉄筋の上端と
は、鉄筋に引っ張り力のみが作用するように第2の連結
手段で連結されていることを特徴とする。また、本発明
は、前記鋼管の外周面と穴の内壁との間にはグラウトが
充填され、これにより鋼管の外周面と穴の内壁が密着さ
れていることを特徴とする。また、本発明は、前記鋼管
の内部で鉄筋の上部にはシース材が巻装され、前記グラ
ウトは鋼管の下部から上部にわたり充填されていること
を特徴とする。また、本発明は、前記第1の連結手段
が、鋼管の上端に設けられた上端係合部と、前記穴の上
に位置する構造物側の部分で前記上端係合部の上方に前
記上端係合部との間に間隔H1の隙間を確保して設けら
れた下向きの構造物側係合部を備え、構造物側が下方に
前記間隔H1変位した状態で、前記下向きの構造物側係
合部と鋼管の上端係合部とが当接されるように構成され
ていることを特徴とする。また、本発明は、前記第2の
連結手段が、鉄筋の上端に設けられた上端係合部と、前
記穴の上に位置する構造物側の部分で前記鉄筋が上方に
挿通され前記上端係合部との間に間隔H2の隙間を確保
して上端係合部の下方に設けられた上向きの構造物側係
合部を備え、構造物側が上方に前記間隔H2変位した状
態で、上向きの構造物側係合部と鉄筋の上端係合部とが
当接されるように構成されていることを特徴とする。ま
た、本発明は、地盤に穴を掘削し、前記穴の中に鋼管を
挿入して鋼管の外周面と孔の壁面とを密着させ、前記鋼
管の内部に鋼管よりも長い鉄筋を配置し、前記鋼管の下
部と鉄筋の下部を固定し、前記穴の上に位置する構造物
側に対して、鋼管の上端と鉄筋の上端とを個別に連結
し、地震時に構造物側から受ける圧縮力のみを鋼管で受
け引っ張り力のみを鉄筋で受けるようにしたことを特徴
とする。
In order to achieve the above object, the present invention comprises a steel pipe inserted into a hole excavated in the ground, and a reinforcing bar inserted inside the steel pipe. The surface of the rebar is closely attached to the inner wall of the hole, and the lower part of the rebar is located at the lower part of the steel pipe and the upper end thereof is arranged to protrude above the upper end of the steel pipe. Connected by a grout injected into the inside of the structure, the structure side located above the hole and the upper end of the steel pipe are connected by first connecting means so that only a compressive force acts on the steel pipe, and further, The structure side and the upper end of the reinforcing bar are connected by a second connecting means so that only a tensile force acts on the reinforcing bar. Further, the present invention is characterized in that grout is filled between the outer peripheral surface of the steel pipe and the inner wall of the hole, whereby the outer peripheral surface of the steel pipe and the inner wall of the hole are in close contact with each other. Further, the present invention is characterized in that a sheath material is wound around an upper part of a reinforcing bar inside the steel pipe, and the grout is filled from a lower part to an upper part of the steel pipe. Also, in the present invention, the first connecting means may include an upper end engaging portion provided at an upper end of the steel pipe, and the upper end above the upper end engaging portion at a structure side portion located above the hole. A downward structure-side engaging portion provided with a gap of H1 between the engaging portion and the downward structure-side engaging portion in a state where the structure side is displaced downward by the distance H1. It is characterized in that the portion and the upper end engaging portion of the steel pipe are configured to be in contact with each other. Further, in the present invention, the second connecting means may include an upper end engaging portion provided at an upper end of the reinforcing bar, and the reinforcing bar may be inserted upward at a portion of the structure located above the hole on the side of the structure. An upward structure-side engaging portion provided below the upper end engaging portion with a gap of an interval H2 secured between the joining portion and the upper portion is provided. It is characterized in that the structure side engaging portion and the upper end engaging portion of the reinforcing bar are configured to be in contact with each other. In addition, the present invention also excavates a hole in the ground, inserts a steel pipe into the hole to make the outer peripheral surface of the steel pipe closely contact the wall surface of the hole, and arranges a reinforcing bar longer than the steel pipe inside the steel pipe, The lower part of the steel pipe and the lower part of the rebar are fixed, and the upper end of the steel pipe and the upper end of the rebar are individually connected to the structure side located above the hole, and only the compressive force received from the structure side during an earthquake And the steel tube receives only the pulling force.
【0005】本発明では、杭が、鋼管と、鋼管の内部に
挿入され下部が鋼管と連結された鉄筋とで構成され、鋼
管と鉄筋が第1の連結手段と第2の連結手段により別々
に構造物側に連結されているので、鋼管の圧縮に対する
変位と抵抗力が所望値に設定され、これとは別に、鉄筋
の引っ張りに対する変位と抵抗力が所望値に設定され
る。従って、構造物のある変位量を越えた時点から初め
て杭に抵抗力を発揮させるようにも設定でき、また、杭
体表面と地盤との境界面にグラウト注入材を充填した場
合であってもこのグラウト注入材を保護できる。
In the present invention, the pile is composed of a steel pipe and a reinforcing bar inserted into the steel pipe and having a lower portion connected to the steel pipe, and the steel pipe and the reinforcing bar are separately separated by the first connecting means and the second connecting means. Since the steel pipe is connected to the structure, the displacement and resistance to compression of the steel pipe are set to desired values, and separately from this, the displacement and resistance to tension of the rebar are set to desired values. Therefore, it is possible to set the pile to exhibit resistance only after a certain amount of displacement of the structure is exceeded, and even when the grout injection material is filled at the boundary surface between the pile body surface and the ground. This grout injection material can be protected.
【0006】[0006]
【発明の実施の形態】次に本発明の杭及び杭による構造
物の支持方法を、高速道路の橋脚補強に適用した実施例
について説明する。図1は高速道路の橋脚のフーチング
部の平面図、図2は杭部分の断面正面図、図3は図2の
AA断面図を示す。高速道路の橋脚2のフーチング部4
は長方形に形成され、フーチング部4の中央には橋脚の
柱6が立設され、柱6の下方及び両側方のフーチング部
4箇所には既設の杭8が設けられており、フーチング部
4の両側に新たなフーチング部10が増設され、本発明
の実施例に係る杭12がこのフーチング部10において
それぞれ3本ずつ設けられている。なお、既設の杭8
は、支持杭や摩擦杭、或は、既製コンクリート杭、場所
打ちコンクリート杭、鋼杭等の種別は問わない。前記杭
12は、鋼管14と、鋼管14の内部に設けられた鉄筋
16と、鋼管14の内部に充填されたグラウト18等に
より構成されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which a pile and a method of supporting a structure by the pile according to the present invention are applied to pier reinforcement of a highway will be described. 1 is a plan view of a footing portion of a pier on an expressway, FIG. 2 is a sectional front view of a pile portion, and FIG. 3 is a sectional view taken along the line AA of FIG. Footing part 4 of pier 2 of highway
Is formed in a rectangular shape, and a pillar 6 of a pier is erected at the center of the footing portion 4, and an existing pile 8 is provided at four places of the footing portion below and on both sides of the pillar 6. New footing portions 10 are additionally provided on both sides, and three piles 12 according to the embodiment of the present invention are provided in each of the footing portions 10. In addition, the existing pile 8
Any type of support pile, friction pile, ready-made concrete pile, cast-in-place concrete pile, steel pile, and the like can be used. The pile 12 includes a steel pipe 14, a reinforcing bar 16 provided inside the steel pipe 14, a grout 18 filled inside the steel pipe 14, and the like.
【0007】杭12を施工するに際しては、まず掘削機
により穴20が鉛直に掘削される。次に、穴20に鋼管
14が鉛直に挿入される。鋼管14の上端には、外周部
が鋼管14の半径方向外側に位置し、内周部が鋼管14
の半径方向内側に位置する環状のフランジ22(特許請
求の範囲の鋼管の上端係合部に相当)が取着されてい
る。このような鋼管14として例えば直径が100〜3
00mm程度のマイクロパイルを用いることができる。
鋼管14は、鋼管14の外周面にグラウト18が塗り付
けられつつ穴20に挿入され、このグラウト18によ
り、鋼管14の外周面と穴20の壁面との間の隙間が閉
塞され、鋼管14の外周面が穴20の壁面に密着される
ことになる。次に、鋼管14の内部断面の中央に沿って
鉄筋16を鉛直に配置する。鉄筋16は鋼管14よりも
長く、鉄筋16の下端と鋼管14の下端はほぼ同じ高さ
で配置され、鉄筋16の上端は鋼管14の上端の上方に
突出している。鉄筋16の上半部にはシース材24(或
はシース管)が巻装され、鉄筋16の上端には支圧板2
6(特許請求の範囲の鉄筋16の上端係合部に相当)が
取着されている。次に、鋼管14の内部にグラウト18
を注入し充填する。
[0007] In constructing the pile 12, first, the hole 20 is excavated vertically by an excavator. Next, the steel pipe 14 is vertically inserted into the hole 20. At the upper end of the steel pipe 14, the outer peripheral part is located radially outward of the steel pipe 14, and the inner peripheral part is
An annular flange 22 (corresponding to the upper end engaging portion of the steel pipe in the claims) located radially inward of is attached. As such a steel pipe 14, for example, a diameter of 100 to 3 is used.
A micropile of about 00 mm can be used.
The steel pipe 14 is inserted into the hole 20 while a grout 18 is applied to the outer peripheral surface of the steel pipe 14. The grout 18 closes a gap between the outer peripheral surface of the steel pipe 14 and the wall surface of the hole 20, and The outer peripheral surface is brought into close contact with the wall surface of the hole 20. Next, the reinforcing bar 16 is disposed vertically along the center of the internal cross section of the steel pipe 14. The rebar 16 is longer than the steel pipe 14, and the lower end of the rebar 16 and the lower end of the steel pipe 14 are arranged at substantially the same height, and the upper end of the rebar 16 protrudes above the upper end of the steel pipe 14. A sheath material 24 (or a sheath tube) is wound around the upper half of the reinforcing bar 16, and the support plate 2
6 (corresponding to the upper end engaging portion of the reinforcing bar 16 in the claims) is attached. Next, the grout 18 is provided inside the steel pipe 14.
And fill.
【0008】なお、杭12は次のように施工してもよ
い。すなわち、掘削機により穴20を掘削した後、穴2
0にグラウト18を充填し、その後、穴20に鋼管14
を挿入し、鋼管14の内部に、その上半部にシース材2
4が巻装された鉄筋16を配置する。この場合には、穴
20に鋼管14を挿入する時に、鋼管14の外周面と穴
20の壁面との間にグラウト18が充填されるので、鋼
管14の外周面にグラウト18を塗り付ける作業は省略
される。また、グラウト18を用いることなく鋼管14
の外周面と穴20の壁面が密着される場合にも、鋼管1
4の外周面にグラウト18を塗り付ける作業は省略され
る。
The pile 12 may be constructed as follows. That is, after excavating the hole 20 with an excavator,
0 is filled with grout 18 and then the steel pipe 14
Is inserted into the steel pipe 14 and the sheath material 2
The reinforcing bar 16 on which the wire 4 is wound is arranged. In this case, since the grout 18 is filled between the outer peripheral surface of the steel pipe 14 and the wall surface of the hole 20 when the steel pipe 14 is inserted into the hole 20, the work of applying the grout 18 to the outer peripheral surface of the steel pipe 14 is omitted. Is done. Further, the steel pipe 14 can be used without using the grout 18.
When the outer peripheral surface of the steel pipe is in close contact with the wall surface of the hole 20, the steel pipe 1
The work of applying grout 18 to the outer peripheral surface of 4 is omitted.
【0009】次に、フーチング部8の両側にコンクリー
トを打設して新たなフーチング部10を形成する。前記
フーチング部10は、前記鋼管14の上端及びフランジ
22が収容される下方に開放状の凹部32と、凹部32
の上壁34の上に形成された空間部36を備え、凹部3
2の上壁34には穴38が形成され、この穴38に前記
鉄筋16が挿通され、支圧板26が前記空間部36に収
容されている。そして、凹部32の上壁34の下面34
A(特許請求の範囲の下向きの構造物側係合部に相当)
とフランジ22との間には間隔H1が設けられている。
すなわち、フーチング部10が上方に変位した際には、
凹部32は下方に開放状であるので、フーチング部10
によりフランジ22が引っ張られることはなく、フーチ
ング部10が下方に間隔H1以上の変位量で変位した際
にフランジ22に圧縮力がかかり、従って、鋼管14に
圧縮力のみが作用するようにフーチング部10と鋼管1
4の上端を連結する第1の連結手段がこれら凹部32や
フランジ22で構成されている。また、上壁34の上面
34B(特許請求の範囲の上向きの構造物側係合部に相
当)と支圧板26との間には間隔H2が設けられ、空間
36の上壁下面36Aと支圧板26との間には前記間隔
H1よりも大きな間隔H3が設けられている。すなわ
ち、フーチング部10が下方に変位した際には、フーチ
ング部10が先にフランジ22に当接するため、鉄筋1
6には圧縮力が作用せず、フーチング部10が上方に間
隔H2よりも大きな変位量で変位した際に鉄筋16に引
っ張り力がかかり、従って、鉄筋16に引っ張り力のみ
が作用するようにフーチング部10と鉄筋16の上端を
連結する第2の連結手段がこれら空間部36や支圧板2
6で構成されている。なお、補強用としてではなく構造
物を新設する場合には、フーチング部に予め凹部32及
び空間部36を設けておけばよい。
Next, concrete is cast on both sides of the footing portion 8 to form a new footing portion 10. The footing portion 10 includes a concave portion 32 that is open downward and accommodates the upper end of the steel pipe 14 and the flange 22.
A space 36 formed on the upper wall 34 of the
A hole 38 is formed in the upper wall 34, the reinforcing bar 16 is inserted into the hole 38, and the supporting plate 26 is housed in the space 36. Then, the lower surface 34 of the upper wall 34 of the recess 32
A (corresponding to the downward structure side engaging portion in the claims)
An interval H <b> 1 is provided between the flange 22.
That is, when the footing unit 10 is displaced upward,
Since the recess 32 is open downward, the footing 10
Therefore, when the footing portion 10 is displaced downward by a displacement amount equal to or more than the interval H1, a compression force is applied to the flange 22. Therefore, the footing portion is configured such that only the compression force acts on the steel pipe 14. 10 and steel pipe 1
The first connecting means for connecting the upper ends of the four portions 4 is constituted by the concave portion 32 and the flange 22. An interval H2 is provided between the upper surface 34B of the upper wall 34 (corresponding to the upwardly-facing structure-side engaging portion in the claims) and the support plate 26, and the upper wall lower surface 36A of the space 36 and the support plate 36 are provided. 26, an interval H3 larger than the interval H1 is provided. That is, when the footing portion 10 is displaced downward, the footing portion 10 comes into contact with the flange 22 first.
6, no compressive force is applied, and when the footing portion 10 is displaced upward by a displacement amount larger than the interval H2, a tensile force is applied to the reinforcing bar 16, so that only the pulling force is applied to the reinforcing bar 16. The second connecting means for connecting the upper end of the reinforcing bar 16 to the space 10 is provided by the space 36 and the support plate 2.
6. When a structure is newly provided not for reinforcement, the recess 32 and the space 36 may be provided in advance in the footing portion.
【0010】次に、作用について説明する。地震時、高
速道路の橋脚2、すなわち既設構造物が下方に間隔H1
以内の変位量で変位した際には既設の杭8が抵抗力を発
揮する。そして、既設構造物が下方に間隔H1以上変位
した際、フランジ22と凹部32の上壁34の下面34
Aが当接し、鋼管14が圧縮力に対して初めて抵抗力を
発揮する。また、既設構造物が上方に間隔H2以内の変
位量で変位した際には既設の杭8が抵抗力を発揮する。
そして、既設構造物が上方に間隔H2以上変位した際、
支圧板26と凹部32の上壁34の上面34Bが当接
し、鉄筋16が引っ張り力に対して初めて抵抗力を発揮
する。この場合、鋼管14にはその反力として圧縮力が
作用し、地震時、鋼管14には圧縮力のみが作用するこ
とになり、鋼管14の外周面に塗り付けたグラウト18
にひび割れが生ぜず、従って、杭12の地盤に対する摩
擦力を高める上で、また、鋼管14の防錆上有利とな
る。
Next, the operation will be described. At the time of the earthquake, the pier 2 of the highway, that is, the existing structure, is
The existing pile 8 exerts a resistance when it is displaced by a displacement amount within the range. When the existing structure is displaced downward by the distance H1 or more, the lower surface 34 of the upper wall 34 of the flange 22 and the concave portion 32 is displaced.
A comes into contact, and the steel pipe 14 exhibits resistance for the first time against the compressive force. Also, when the existing structure is displaced upward by a displacement amount within the interval H2, the existing pile 8 exerts a resistance.
Then, when the existing structure is displaced upward by the distance H2 or more,
The support plate 26 and the upper surface 34 </ b> B of the upper wall 34 of the recess 32 abut against each other, and the reinforcing bar 16 exerts resistance to tensile force for the first time. In this case, a compressive force acts on the steel pipe 14 as a reaction force, and only a compressive force acts on the steel pipe 14 during an earthquake, so that the grout 18 applied to the outer peripheral surface of the steel pipe 14 is applied.
Cracks do not occur, which is advantageous in increasing the frictional force of the pile 12 against the ground and in preventing the steel pipe 14 from rusting.
【0011】従って、本実施例によれば、間隔H1を適
宜値に決めることで杭12の圧縮に対する変位と抵抗力
が所望値に設定される。また、シース材24に巻装され
た鉄筋16の長さや、鉄筋16の弾性係数、鉄筋16の
断面積、間隔H2を適宜値に決めることで、杭12の引
っ張りに対する変位と抵抗力が所望値に設定される。こ
のようなことから、例えば、既設の杭8が破壊された時
点から補強用の杭12を機能させるように設定すること
も可能となる。また、H1やH2をゼロに設定すれば、
既設の杭8と同時に補強用の杭12を機能させることも
可能となる。
Therefore, according to the present embodiment, the displacement and the resistance against the compression of the pile 12 are set to desired values by appropriately setting the interval H1. Further, by appropriately setting the length of the reinforcing bar 16 wound around the sheath material 24, the elastic coefficient of the reinforcing bar 16, the cross-sectional area of the reinforcing bar 16, and the interval H2, the displacement and the resistance to the pulling of the pile 12 are set to desired values. Is set to For this reason, for example, it is also possible to make settings so that the reinforcing pile 12 functions when the existing pile 8 is destroyed. If H1 and H2 are set to zero,
It is also possible to make the reinforcing pile 12 function simultaneously with the existing pile 8.
【0012】なお、実施例では既設構造物を補強する杭
の場合について説明したが、本発明の杭は新設の構造物
の支持にも無論適用される。
Although the embodiment has been described with reference to the case of a pile for reinforcing an existing structure, the pile of the present invention is of course applicable to the support of a new structure.
【0013】[0013]
【発明の効果】以上の説明で明らかなように本発明の杭
及び杭による構造物の支持方法によれば、杭が、圧縮力
のみを受ける鋼管と、引っ張り力のみを受ける鉄筋とで
構成され、鋼管と鉄筋が第1の連結手段と第2の連結手
段により別々に構造物側に連結されているので、鋼管の
圧縮に対する変位と抵抗力が所望値に設定され、これと
は別に、鉄筋の引っ張りに対する変位と抵抗力が所望値
に設定される。従って、構造物のある変位量を越えた時
点から初めて杭に抵抗力を発揮させるようにも設定で
き、また、杭の表面と地盤との境界面にグラウト注入材
を充填した場合であってもこのグラウト注入材を保護で
きる。
As apparent from the above description, according to the pile and the method of supporting a structure using the pile according to the present invention, the pile is composed of a steel pipe which receives only a compressive force and a reinforcing bar which receives only a tensile force. Since the steel pipe and the reinforcing steel are separately connected to the structure side by the first connecting means and the second connecting means, the displacement and the resistance to the compression of the steel pipe are set to desired values. Is set to a desired value. Therefore, it is possible to set the pile to exert its resistance for the first time after a certain displacement amount of the structure is exceeded, and even when the grout injection material is filled at the boundary surface between the pile surface and the ground. This grout injection material can be protected.
【図面の簡単な説明】[Brief description of the drawings]
【図1】高速道路の橋脚のフーチング部の平面図であ
る。
FIG. 1 is a plan view of a footing portion of a pier on an expressway.
【図2】杭部分の断面正面図である。FIG. 2 is a sectional front view of a pile portion.
【図3】図2のAA断面図である。FIG. 3 is a sectional view taken along the line AA of FIG. 2;
【符号の説明】[Explanation of symbols]
4、10 フーチング部 12 杭 14 鋼管 16 鉄筋 18 グラウト 20 穴 22 フランジ 24 シース材 26 支圧板 32 凹部 36 空間部 4, 10 Footing part 12 Pile 14 Steel pipe 16 Reinforcing bar 18 Grout 20 Hole 22 Flange 24 Sheath material 26 Support plate 32 Depression 36 Space

Claims (6)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 地盤に掘削された穴に挿入された鋼管
    と、 前記鋼管の内部に挿入された鉄筋とを備え、 前記鋼管はその外周面が穴の内壁に密着され、 前記鉄筋はその下部が鋼管の下部に位置されると共にそ
    の上端が鋼管の上端よりも上方に突出されて配置され、 前記鋼管の少なくとも下部と鉄筋の下部は鋼管の内部に
    注入されたグラウトにより連結され、 前記穴の上に位置する構造物側と鋼管の上端とは、鋼管
    に圧縮力のみが作用するように第1の連結手段で連結さ
    れ、 更に、前記構造物側と鉄筋の上端とは、鉄筋に引っ張り
    力のみが作用するように第2の連結手段で連結されてい
    る、 ことを特徴とする杭。
    1. A steel pipe inserted into a hole excavated in the ground, and a reinforcing steel inserted into the steel pipe, wherein the outer peripheral surface of the steel pipe is in close contact with an inner wall of the hole, and the reinforcing steel has a lower part thereof. Is located at the lower part of the steel pipe and the upper end thereof is disposed so as to protrude above the upper end of the steel pipe. At least the lower part of the steel pipe and the lower part of the rebar are connected by grout injected into the inside of the steel pipe, and The upper structure side and the upper end of the steel pipe are connected by first connecting means so that only a compressive force acts on the steel pipe. Further, the structure side and the upper end of the rebar are connected to each other by a tensile force. Stakes are connected by second connection means so that only the stakes work.
  2. 【請求項2】 前記鋼管の外周面と穴の内壁との間には
    グラウトが充填され、これにより鋼管の外周面と穴の内
    壁が密着されている請求項1記載の杭。
    2. The pile according to claim 1, wherein a grout is filled between the outer peripheral surface of the steel pipe and the inner wall of the hole, whereby the outer peripheral surface of the steel pipe and the inner wall of the hole are brought into close contact with each other.
  3. 【請求項3】 前記鋼管の内部で鉄筋の上部にはシース
    材が巻装され、前記グラウトは鋼管の下部から上部にわ
    たり充填されている請求項1または2記載の杭。
    3. The pile according to claim 1, wherein a sheath material is wound around an upper part of the reinforcing steel inside the steel pipe, and the grout is filled from a lower part to an upper part of the steel pipe.
  4. 【請求項4】 前記第1の連結手段は、鋼管の上端に設
    けられた上端係合部と、前記穴の上に位置する構造物側
    の部分で前記上端係合部の上方に前記上端係合部との間
    に間隔H1の隙間を確保して設けられた下向きの構造物
    側係合部を備え、構造物側が下方に前記間隔H1変位し
    た状態で、前記下向きの構造物側係合部と鋼管の上端係
    合部とが当接されるように構成されている請求項1、2
    または3記載の杭。
    4. The first connecting means includes an upper end engaging portion provided at an upper end of a steel pipe and a upper end engaging portion provided above the upper end engaging portion at a structure side portion located above the hole. A downward structure-side engaging portion provided with a gap of H1 between the joint portion and the downward structure-side engaging portion in a state where the structure side is displaced downward by the distance H1. And the upper end engaging portion of the steel pipe is abutted.
    Or the pile described in 3.
  5. 【請求項5】 前記第2の連結手段は、鉄筋の上端に設
    けられた上端係合部と、前記穴の上に位置する構造物側
    の部分で前記鉄筋が上方に挿通され前記上端係合部との
    間に間隔H2の隙間を確保して上端係合部の下方に設け
    られた上向きの構造物側係合部を備え、構造物側が上方
    に前記間隔H2変位した状態で、上向きの構造物側係合
    部と鉄筋の上端係合部とが当接されるように構成されて
    いる請求項1、2、3または4記載の杭。
    5. The second connection means includes an upper end engaging portion provided at an upper end of a reinforcing bar, and the upper end engaging portion, wherein the reinforcing bar is inserted upward at a structure side portion located above the hole. An upward structure-side engaging portion provided below the upper end engaging portion while securing a gap of an interval H2 between the upper and lower portions, and an upward structure with the structure side displaced upward by the interval H2. The pile according to claim 1, wherein the object-side engaging portion and the upper end engaging portion of the reinforcing bar are configured to be in contact with each other.
  6. 【請求項6】 地盤に穴を掘削し、 前記穴の中に鋼管を挿入して鋼管の外周面と孔の壁面と
    を密着させ、 前記鋼管の内部に鋼管よりも長い鉄筋を配置し、 前記鋼管の下部と鉄筋の下部を固定し、 前記穴の上に位置する構造物側に対して、鋼管の上端と
    鉄筋の上端とを個別に連結し、 地震時に構造物側から受ける圧縮力のみを鋼管で受け、
    引っ張り力のみを鉄筋で受けるようにした、 ことを特徴とする杭による構造物の支持方法。
    6. A hole is excavated in the ground, a steel pipe is inserted into the hole so that an outer peripheral surface of the steel pipe and a wall surface of the hole are in close contact with each other, and a reinforcing bar longer than the steel pipe is arranged inside the steel pipe. The lower part of the steel pipe and the lower part of the rebar are fixed, and the upper end of the steel pipe and the upper end of the rebar are individually connected to the structure side located above the hole, and only the compressive force received from the structure side during an earthquake is Received in steel pipe,
    A method of supporting a structure by using a pile, wherein only a tensile force is received by a reinforcing bar.
JP7070797A 1997-03-07 1997-03-07 Pile and method for supporting structure using the same Granted JPH10252063A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7070797A JPH10252063A (en) 1997-03-07 1997-03-07 Pile and method for supporting structure using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7070797A JPH10252063A (en) 1997-03-07 1997-03-07 Pile and method for supporting structure using the same

Publications (1)

Publication Number Publication Date
JPH10252063A true JPH10252063A (en) 1998-09-22

Family

ID=13439339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7070797A Granted JPH10252063A (en) 1997-03-07 1997-03-07 Pile and method for supporting structure using the same

Country Status (1)

Country Link
JP (1) JPH10252063A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179174A (en) * 2014-08-13 2014-12-03 山东科技大学 Porous grouted pipe special-shaped pile and pile-forming method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179174A (en) * 2014-08-13 2014-12-03 山东科技大学 Porous grouted pipe special-shaped pile and pile-forming method

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