JP2012167473A - Reinforcement structure and reinforcement method of columnar structure - Google Patents

Reinforcement structure and reinforcement method of columnar structure Download PDF

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JP2012167473A
JP2012167473A JP2011028618A JP2011028618A JP2012167473A JP 2012167473 A JP2012167473 A JP 2012167473A JP 2011028618 A JP2011028618 A JP 2011028618A JP 2011028618 A JP2011028618 A JP 2011028618A JP 2012167473 A JP2012167473 A JP 2012167473A
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columnar
steel
concrete foundation
space
water
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Yasushi Iwamoto
▲靖▼ 岩本
Toshihiro Kondo
俊宏 近藤
Yohei Umemoto
洋平 梅本
Keisuke Yoshida
啓助 吉田
Takahiro Sunagawa
高寛 砂川
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Oriental Shiraishi Corp
オリエンタル白石株式会社
Daiichi Cutter Kogyo Kk
第一カッター興業株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure and a reinforcement method of a columnar structure.SOLUTION: A steel cylindrical body 3 is press-fitted to soil 4 in the state of being separated from a column body part in a columnar structure 1, and is installed to a concrete foundation 5 in the columnar structure 1. A water cutoff layer 10 is provided on the concrete foundation 5 inside a space from which sediment is discharged between a column body part 2 and the steel cylindrical body 3 on the outer side, and the lower end inner side of the steel cylindrical body 3 is cut off. A plurality of vertical holes 16 for an anchor are provided at intervals in a circumferential direction of the column body part 2 over the water cutoff layer 10 and the concrete foundation 5, a lower end side of a rod-like steel material 19 is inserted and disposed respectively in the vertical holes 16 for the anchor and fixed by an adhesive 18 filled inside the vertical holes 16 for the anchor, and a cement-based filler 21 is filled in the space so as to bury the rod-like steel material 19.

Description

本発明は、橋脚或は杭基礎等における柱状構造物の補強構造及び補強方法に関する。   The present invention relates to a reinforcing structure and a reinforcing method for a columnar structure on a bridge pier or a pile foundation.
従来、鉄筋コンクリート製の柱状構造物の周囲に、柱状構造物における柱体部分を囲むように鋼製筒状体を地盤に圧入し、柱状構造物と柱体部分との間の土砂を排出して空間を形成し、前記空間部分にモルタル等を充填して、柱状構造物を補強する柱状構造物の補強構造あるいは補強方法が知られている(例えば、特許文献1参照)。
また、プレキャストコンクリート製ブロックを圧入すると共にコンクリートブロック内に配置したPC鋼材を緊張定着することも知られている(例えば、特許文献2参照)。
また、既設橋脚の周囲に仮設設備を設置し、PC鋼材を帯鉄筋として用いて巻き付けて緊張定着させ、既設橋脚の耐震補強を図る工法も知られている。
Conventionally, a steel tubular body is pressed into the ground around a reinforced concrete columnar structure so as to surround the columnar part of the columnar structure, and the earth and sand between the columnar structure and the columnar part are discharged. A reinforcement structure or reinforcement method for a columnar structure is known in which a space is formed and the space portion is filled with mortar or the like to reinforce the columnar structure (see, for example, Patent Document 1).
It is also known to press-fit a precast concrete block and fix a PC steel material placed in the concrete block by tension (for example, see Patent Document 2).
There is also known a construction method in which temporary equipment is installed around an existing pier, and a PC steel material is wound as a steel reinforcing bar to fix the tension and thereby seismically strengthen the existing pier.
特開2000−336946号公報JP 2000-336946 A 特開2007−162448号公報JP 2007-162448 A
前記従来の場合は、柱状構造物と柱体部分との間の空間にモルタル等を充填した場合に、鉛直荷重等に対して補強することができても、柱状構造物における柱体部分とこれに接続するコンクリート基礎との水平方向のせん断力に対する補強が困難であるため、前記のモルタル等の厚みを増して対応することが考えられるが、経済的でないという問題があった。
また、プレキャストコンクリートブロックを用いそのブロック内に配置されたPC鋼材を緊張定着させる形態では、PC鋼材に大きなせん断抵抗力を期待することができないため、柱状構造物の周りの断面積を大きくして、せん断抵抗力を期待するようになるため、横断面が大きくなり経済的でないという問題がある。
また、既設橋脚の周囲に仮設材を設置し、PC鋼材を帯鉄筋として用いて既設橋脚に巻き付けて緊張定着させ、既設橋脚の耐震補強を図る工法の場合は、仮設設備が大掛かりとなり、また河川内では浚渫を行うので、河川環境面において悪影響を及ぼすことになる。
前記のように、従来の補強工法では、既設橋脚等の既設柱状構造物のせん断抵抗力を増強するせん断補強に加えて、曲げ抵抗力を増強する曲げ補強を満足する工法が無く、前記のPC鋼材を既設橋脚に巻き付けて緊張定着させる工法の場合は、そうであっても前記の通り、環境にやさしくないという問題がある。
従来工法では、前記のような課題があることから、橋脚等の柱状構造物のせん断補強及び曲げ補強が可能で、河川内の場合では環境面でさらに環境にやさしい補強構造及び補強方法が望まれる。
本発明は、前記の課題を有利に解消することができ、橋脚等の柱状構造物のせん断補強及び曲げ補強が可能で、河川内の場合では環境面でさらに環境にやさしい柱状構造物の補強構造及び補強方法を提供することを目的とする。
In the conventional case, when the space between the columnar structure and the column body portion is filled with mortar or the like, the column body portion in the columnar structure can be Since it is difficult to reinforce the horizontal shearing force with the concrete foundation connected to the mortar, it may be possible to increase the thickness of the mortar or the like, but this is not economical.
In addition, in a form in which a PC steel material placed in the block is tension-fixed using a precast concrete block, a large shear resistance force cannot be expected for the PC steel material, so the cross-sectional area around the columnar structure is increased. Since a shear resistance is expected, there is a problem that the cross section becomes large and is not economical.
In the case of a construction method in which temporary materials are installed around existing piers, and PC steel is wrapped around the existing piers using straps to fix the tension, and the existing piers are seismically reinforced, the temporary facilities are large, Since dredging is carried out in the river, it will have an adverse effect on the river environment.
As described above, in the conventional reinforcement method, there is no method that satisfies the bending reinforcement that enhances the bending resistance in addition to the shear reinforcement that enhances the shear resistance of the existing columnar structure such as the existing pier, and the PC In the case of a construction method in which a steel material is wound around an existing pier to fix the tension, as described above, there is a problem that it is not friendly to the environment.
Since the conventional method has the above-mentioned problems, it is possible to perform shear reinforcement and bending reinforcement of columnar structures such as bridge piers. In the case of rivers, a more environmentally friendly reinforcement structure and reinforcement method are desired. .
The present invention can advantageously solve the above-mentioned problems, and can be used for shear reinforcement and bending reinforcement of columnar structures such as piers. In the case of rivers, the structure for reinforcing columnar structures is more environmentally friendly in terms of environment. And it aims at providing the reinforcement method.
前記の課題を有利に解決するために、第1発明の柱状構造物の補強構造では、柱状構造物における柱体部分から離れた状態で鋼製筒状体が地盤に圧入されて、前記柱状構造物におけるコンクリート基礎に設置され、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層が設けられて鋼製筒状体の下端内側が止水され、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔が柱体部分の周方向に間隔をおいて複数設けられ、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側が挿入配置されてアンカー用縦孔内に充填された接着剤により固定され、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材が充填されていることを特徴とする。
また、第2発明の柱状構造物の補強方法では、第1発明の柱状構造物の補強構造を構築するための柱状構造物の補強方法であって、柱状構造物における柱体部分から離れた状態で鋼製筒状体を地盤に圧入して、前記柱状構造物におけるコンクリート基礎に設置し、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層を設けて鋼製筒状体の下端内側を止水し、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔を柱体部分の周方向に間隔をおいて複数設け、前記空間をドライとした状態で、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置してアンカー用縦孔内に充填された接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填することを特徴とする。
第3発明では、第2発明の柱状構造物の補強方法において、前記各アンカー用縦孔はウォータージェット工法により削孔されることを特徴とする。
第4発明の柱状構造物の補強方法では、第2発明又は第3発明の柱状構造物の補強方法において、鋼製筒状体は、複数の鋼板ブロックが筒状に順次継ぎ足されて形成されることを特徴とする。
In order to advantageously solve the above-described problem, in the columnar structure reinforcement structure according to the first aspect of the present invention, the steel tubular body is press-fitted into the ground in a state of being separated from the columnar portion of the columnar structure, and the columnar structure is provided. The bottom of the steel cylinder is provided with a water-stop layer on the concrete foundation in the space where the earth and sand between the column body part and the steel cylinder outside of the column body are discharged. The inside is water-stopped, and a plurality of vertical holes for anchors are provided at intervals in the circumferential direction of the column body part across the water-stopping layer and the concrete foundation, and the lower end side of the bar-shaped steel material is inserted into each vertical hole for anchors The space is filled with a cement-type filler so as to be embedded and fixed with an adhesive filled in the anchor vertical holes and to embed the rod-shaped steel material.
The columnar structure reinforcing method according to the second invention is a columnar structure reinforcing method for constructing the columnar structure reinforcing structure according to the first invention, wherein the columnar structure is separated from the column part in the columnar structure. The concrete foundation in the space where the steel tubular body is press-fitted into the ground, installed on the concrete foundation in the columnar structure, and the earth and sand between the columnar portion and the steel tubular body on the outside is discharged. A water stop layer is provided on the bottom end of the steel tubular body to stop water, and a plurality of vertical holes for anchors are provided at intervals in the circumferential direction of the column portion over the water stop layer and the concrete foundation, In a state where the space is dry, the lower end side of the bar-shaped steel material is inserted and arranged in each anchor vertical hole and fixed with an adhesive filled in the anchor vertical hole, and then the bar-shaped steel material is embedded. Fill the space with cement filler. Characterized in that it.
According to a third invention, in the method for reinforcing a columnar structure according to the second invention, each of the anchor vertical holes is drilled by a water jet method.
In the columnar structure reinforcing method of the fourth invention, in the columnar structure reinforcing method of the second invention or the third invention, the steel tubular body is formed by sequentially adding a plurality of steel plate blocks into a cylindrical shape. It is characterized by that.
第1発明によると、柱状構造物における柱体部分から離れた状態で鋼製筒状体が地盤に圧入されて、前記柱状構造物におけるコンクリート基礎に設置され、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層が設けられて鋼製筒状体の下端内側が止水され、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔が柱体部分の周方向に間隔をおいて複数設けられ、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側が挿入配置されてアンカー用縦孔内に充填された接着剤により固定され、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材が充填されているので、鉄筋等の安価な棒状鋼材の下端部をコンクリート基礎に確実に固定しているため、地震時における水平力が作用した場合のせん断抵抗力を格段に高めて補強することができる等の効果が得られる。
また、第2発明の柱状構造物の補強方法では、第1発明の柱状構造物の補強構造を構築するための柱状構造物の補強方法であって、柱状構造物における柱体部分から離れた状態で鋼製筒状体を地盤に圧入して、前記柱状構造物におけるコンクリート基礎に設置し、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層を設けて鋼製筒状体の下端内側を止水し、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔を柱体部分の周方向に間隔をおいて複数設け、前記空間をドライとした状態で、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置してアンカー用縦孔内に充填された接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填するので、鉄筋等の安価な棒状鋼材の下端部をコンクリート基礎に確実に固定して、地震時における水平力が作用した場合のせん断抵抗力を格段に高めた状態で補強することができ、施工も容易である等の効果が得られる。
また、止水層を設けた後、空間をドライとした状態で、各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置してアンカー用縦孔内に充填した接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填するので、棒状鋼材の下端側をコンクリート基礎のアンカー用縦孔に確実に固定することができる等の効果が得られる。
第3発明の柱状構造物の補強方法では、前記各アンカー用縦孔はウォータージェット工法により削孔されるので、既設柱状構造物における鉄筋を含む鋼材等の補強材料を損傷することなく、しかもピンポイントでアンカー用縦孔を既設柱状構造物に削孔できるため、既設柱状構造物を必要以上に損傷することなく、容易に各アンカー用縦孔を削孔することができ、しかも鋼製筒状体内の空間で行うため、周囲を汚濁することがなく、環境にやさしい工法となっている等の効果が得られる。
第4発明の柱状構造物の補強方法では、鋼製筒状体は、その上部に複数の鋼板ブロックが筒状に順次継ぎ足されて形成されるので、鋼製筒状体の形成が容易である等の効果が得られる。
According to the first invention, the steel tubular body is press-fitted into the ground in a state of being separated from the column portion in the columnar structure, and is installed on the concrete foundation in the columnar structure, and the column portion and the steel on the outside thereof. A water blocking layer is provided on the concrete foundation in the space where the earth and sand between the cylindrical body is discharged, and the inside of the lower end of the steel cylindrical body is water stopped, and the anchor extends across the water blocking layer and the concrete foundation. A plurality of vertical holes are provided at intervals in the circumferential direction of the column portion, and the lower end side of the bar-shaped steel material is inserted into each of the anchor vertical holes and fixed by an adhesive filled in the anchor vertical holes. Since the space is filled with cement filler so as to embed the rod-shaped steel material, the lower end of an inexpensive rod-shaped steel material such as a reinforcing bar is securely fixed to the concrete foundation. Made Effects such as shear resistance in the case of can be reinforced greatly enhanced can be obtained.
The columnar structure reinforcing method according to the second invention is a columnar structure reinforcing method for constructing the columnar structure reinforcing structure according to the first invention, wherein the columnar structure is separated from the column part in the columnar structure. The concrete foundation in the space where the steel tubular body is press-fitted into the ground, installed on the concrete foundation in the columnar structure, and the earth and sand between the columnar portion and the steel tubular body on the outside is discharged. A water stop layer is provided on the bottom end of the steel tubular body to stop water, and a plurality of vertical holes for anchors are provided at intervals in the circumferential direction of the column portion over the water stop layer and the concrete foundation, In a state where the space is dry, the lower end side of the bar-shaped steel material is inserted and arranged in each anchor vertical hole and fixed with an adhesive filled in the anchor vertical hole, and then the bar-shaped steel material is embedded. Fill the space with cement filler. Therefore, the lower end of an inexpensive bar-shaped steel material such as a reinforcing bar can be securely fixed to the concrete foundation, and the shear resistance can be reinforced in the state where the horizontal force is applied during an earthquake. Can be obtained.
In addition, after providing the water-stopping layer, in a state where the space is dry, the lower end side of the rod-shaped steel material is inserted and arranged in each anchor vertical hole and fixed with an adhesive filled in the anchor vertical hole, Since the cement-type filler is filled in the space so as to embed the rod-shaped steel material, it is possible to obtain an effect that the lower end side of the rod-shaped steel material can be reliably fixed to the vertical hole for the anchor of the concrete foundation.
In the columnar structure reinforcing method according to the third aspect of the present invention, since each of the anchor vertical holes is drilled by the water jet method, the reinforcing material such as steel including reinforcing bars in the existing columnar structure is not damaged, and the pin Since the vertical holes for anchors can be drilled in the existing columnar structures at points, the vertical holes for anchors can be easily drilled without damaging the existing columnar structures more than necessary, and steel cylinders Since it is performed in the body space, the surroundings are not polluted, and an effect such as an environmentally friendly construction method can be obtained.
In the columnar structure reinforcing method according to the fourth aspect of the present invention, the steel tubular body is formed by sequentially adding a plurality of steel plate blocks to the upper portion thereof in a tubular shape, so that it is easy to form the steel tubular body. Etc. are obtained.
柱状構造物を補強した状態を示す一部縦断正面図である。It is a partially longitudinal front view which shows the state which reinforced the columnar structure. 図1に示す横断平面図で、補強構造の全体を示す横断平面図である。It is a cross-sectional top view which shows the whole reinforcement structure by the cross-sectional top view shown in FIG. 柱状構造物の側周面から間隔をおいて柱状構造物を囲むように、鋼製筒状体を水底地盤又は海底地盤に圧入して、柱状構造物におけるコンクリート基礎に着座させ、鋼製筒状体の下端内側の止水処理をした状態の片側を示す一部縦断正面図である。A steel cylinder is press-fitted into the water bottom or sea bottom so as to surround the column structure at a distance from the side circumferential surface of the column structure, and is seated on the concrete foundation in the column structure, and the steel cylinder It is a partially longitudinal front view which shows the one side of the state which performed the water stop process of the lower end inner side of a body. 鋼製筒状体の内側において、コンクリート基礎にアンカー用縦孔をウォータージェット式削孔装置からなるアンカー用縦孔掘削装置により削孔している状態の片側を示す一部縦断正面図である。It is a partially longitudinal front view which shows the one side of the state which is drilling the vertical hole for anchors in the concrete foundation by the vertical hole drilling apparatus which consists of a water jet type drilling apparatus in the inside of a steel cylindrical body. アンカー用縦孔を所定の深さまで削孔した後、アンカー用縦孔掘削装置を撤去した状態を示す一部縦断正面図である。It is a partial longitudinal cross-sectional front view which shows the state which drilled the vertical hole for anchors to the predetermined depth, and then removed the vertical hole drilling apparatus for anchors. コンクリート基礎に設けた複数のアンカー用縦孔の配置形態を示す横断平面図である。It is a cross-sectional top view which shows the arrangement | positioning form of the some vertical hole for anchors provided in the concrete foundation. 鋼製筒状体の内側において、コンクリート基礎に設けたアンカー用縦孔に棒状鋼材の下端部を挿入した状態を示す一部縦断正面図である。It is a partially vertical front view which shows the state which inserted the lower end part of the rod-shaped steel materials in the vertical hole for anchors provided in the concrete foundation inside the steel cylindrical body. 図7の横断平面図で、アンカー用縦孔及び棒状鋼材の全体の配置形態を示す横断平面図である。FIG. 8 is a cross-sectional plan view of FIG. 7 showing an overall arrangement of anchor vertical holes and rod-shaped steel materials. 棒状鋼材の下端部をアンカー用縦孔内において接着剤により定着した後、鋼製筒状体内にセメント系充填材を充填した状態を示す一部縦断正面図である。It is a partially longitudinal front view showing a state in which the lower end portion of the rod-shaped steel material is fixed with an adhesive in the anchor vertical hole and then the cemented filler is filled in the steel tubular body. 鋼製筒状体の上端部に鋼板製ブロックを継ぎ足すと共に棒状鋼材を継ぎ足している状態を示す一部切欠き縦断正面図である。It is a partially cut longitudinal front view showing a state in which a steel plate block is added to the upper end portion of the steel tubular body and a rod-like steel material is added. 棒状鋼材の連結形態の一例を示す縦断正面図である。It is a vertical front view which shows an example of the connection form of rod-shaped steel materials. 柱状構造物の柱状部上端付近まで、鋼板製ブロック及び棒状鋼材を継ぎ足し、空間にセメント系充填材を充填した状態を示す一部縦断概略正面図である。It is a partially longitudinal schematic front view showing a state in which a steel plate block and a rod-shaped steel material are added up to the vicinity of the upper end of the columnar portion of the columnar structure, and a cement-based filler is filled in the space. 圧入装置により鋼製筒状体を地盤に圧入する場合の一形態を示す一部縦断概略正面図である。It is a partially longitudinal schematic front view showing an embodiment when a steel tubular body is press-fitted into the ground by a press-fitting device.
次に、本発明を図示の実施形態に基づいて詳細に説明する。     Next, the present invention will be described in detail based on the illustrated embodiment.
図1及び図2には、本発明の柱状構造物の補強構造を実施して、鉄筋コンクリート製橋脚あるいは鉄筋コンクリート製杭等の柱状構造物1を補強した状態の片側が示されている。   1 and 2 show one side in a state in which the columnar structure reinforcement structure of the present invention is implemented to reinforce the columnar structure 1 such as a reinforced concrete bridge pier or a reinforced concrete pile.
図1及び図2に示されている補強構造を施工するまでの工程について順次説明すると、図3に示すように、鉄筋コンクリート製の柱状構造物1における柱体部分2から離れた状態で、鋼製筒状体3が海底地盤又は水底地盤等の地盤4に圧入されて、前記柱状構造物1におけるコンクリート基礎5に、鋼製筒状体3の下端部が着座するように設置されている。本発明においては、鋼製筒状体3を海底地盤又は水底地盤等の地盤4に圧入する形態であるので、周囲を汚濁する恐れが少なく環境にやさしい工法となっている。
前記の鋼製筒状体3は、図13に示すように、柱状構造物1の周囲にこれを囲むように鋼板製ブロック6が既設側の鋼製筒状体3の上部に継ぎ足すように配置されて、付き合わせ溶接されて、組立形成される。
鋼製筒状体3を地盤4に圧入する場合には、図13に示すように、柱状構造物1の上部に、液圧ジャッキ等の伸縮式ジャッキ7を備えた圧入装置8を設置すると共に、伸縮式ジャッキ7と分割型の鋼製加圧リングからなる加圧部材9の間にスペーサ材(コマ材)を適宜介在させ、前記圧入装置8における加圧部材9を介して、鋼製筒状体3の上端を下方に向かって押圧して、圧入すると共に、鋼板製ブロック6を圧入された鋼製筒状体3の上部に溶接等により継ぎ足すことを繰り返すことで、鋼製筒状体3の下端部をコンクリート基礎5に着座させることができる。前記の鋼板製ブロック6の溶接接合にあたっては、適宜、柱状構造物1の周囲に設けた組立式浮体23上の作業員により行われる。鋼板製ブロック6は、柱状構造物1の周囲を囲むように、組立式浮体23上のクレーン(又はクレーン船、図示を省略)等により吊り上げ搬送され、仮固定又は仮保持された状態で溶接により接合される。
The steps up to the construction of the reinforcing structure shown in FIGS. 1 and 2 will be described in order. As shown in FIG. 3, the steel structure is made away from the column portion 2 in the columnar structure 1 made of reinforced concrete. The tubular body 3 is press-fitted into the ground 4 such as the seabed ground or the waterbed ground, and is installed so that the lower end of the steel tubular body 3 is seated on the concrete foundation 5 in the columnar structure 1. In the present invention, since the steel tubular body 3 is press-fitted into the ground 4 such as the seabed ground or the waterbed ground, it is an environmentally friendly construction method with less fear of polluting the surroundings.
As shown in FIG. 13, the steel tubular body 3 is formed such that a steel plate block 6 is added to the upper part of the existing steel tubular body 3 so as to surround the columnar structure 1. Placed, butt welded and assembled.
When the steel tubular body 3 is press-fitted into the ground 4, as shown in FIG. 13, a press-fitting device 8 provided with a telescopic jack 7 such as a hydraulic jack is installed on the top of the columnar structure 1. A spacer member (coma member) is appropriately interposed between the telescopic jack 7 and a pressure member 9 composed of a split-type steel pressure ring, and the steel cylinder is interposed via the pressure member 9 in the press-fitting device 8. By pressing the upper end of the cylindrical body 3 downward and press-fitting, and repeatedly adding the steel block 6 to the upper part of the press-fitted steel cylindrical body 3 by welding or the like, a steel cylindrical shape is obtained. The lower end of the body 3 can be seated on the concrete foundation 5. The welding of the steel plate block 6 is appropriately performed by an operator on the assembly type floating body 23 provided around the columnar structure 1. The steel plate block 6 is lifted and conveyed by a crane (or a crane ship, not shown) on the assembly type floating body 23 so as to surround the columnar structure 1 and is welded in a temporarily fixed or temporarily held state. Be joined.
所定の高さの鋼製筒状体3が形成された後、前記柱体部分2とその外側の鋼製筒状体との間が掘削・洗浄されて、その間の土砂が排出され、前記柱体部分2とその外側の鋼製筒状体3の内側部分で、鋼製筒状体3の下端内側を塞ぐように、止水用のコンクリート等の止水材が打設されて、底部の止水層10が形成されて鋼製筒状体3の下端内側が止水された後、鋼製筒状体3内の水が排水されて、空間11が形成されている。   After the steel tubular body 3 having a predetermined height is formed, the space between the pillar portion 2 and the steel tubular body on the outside thereof is excavated and washed, and earth and sand between them are discharged, and the pillar A water-stopping material such as water-stopping concrete is placed so as to close the lower end inside of the steel tubular body 3 at the inner portion of the body tubular portion 3 and the steel tubular body 3 outside thereof. After the water-stopping layer 10 is formed and the inside of the lower end of the steel tubular body 3 is stopped, the water in the steel tubular body 3 is drained, and the space 11 is formed.
次いで、図4に示すように、先端に高圧水噴射ノズル12を有する高圧水供給用縦管13を備えたアンカー用縦孔掘削装置14が、適宜、ガイド治具15によりガイドされて前記空間11内に配置されて、所定圧力の高圧水により、止水層10及びコンクリート基礎5にアンカー用縦孔16が、所定の深さ設けられている。前記のアンカー用縦孔16は、鋼製筒状体3の内側面及び柱体部分2の外面から半径方向で離れた位置に設けられる。
前記のガイド治具15は、図示を省略するが、ボルトにより上下方向の複数のガイド治具ユニットが連結されて構成され、前記のガイド治具15の下端部が底部の止水層10におけるアンカー用縦孔16の近傍に位置するように調整されて着座され、ガイド治具15の上端側は、適宜、柱状構造物1に連結(図示を省略)されて所定の位置を保持するようにされ、ガイド治具15の中間部には、環状のガイド部材17が設けられ、高圧ホース等を介して高圧水供給源(装置)に接続された高圧水供給用縦管13は、前記ガイド部材内に挿入配置されて、高圧水供給用縦管先端の高圧水噴射ノズル12が所定の位置となるようにされる。高圧水供給用縦管13は適宜管体が継ぎ足されて形成される。
高圧水噴射ノズル12から高圧水を噴射する場合、コンクリート基礎5内の鉄筋を切断しないように、高圧水内に研削材(又は研磨材)を含まないと共に、所定の噴射圧力によるウォータージェット工法により、コンクリート部のみを切削して、止水層10及びコンクリート基礎5の上部に渡って前記アンカー用縦孔16は掘削形成され、周方向に等角度間隔等の間隔をおいてアンカー用縦孔16は形成されている。
前記のように、ウォータージェット工法により削孔されるので、既設柱状構造物における鉄筋を含む鋼材等の補強材料(主に、鉄筋、鋼製金具、溶接部)を損傷することなく、しかもピンポイントでアンカー用縦孔を既設柱状構造物に削孔できるため、既設柱状構造物を必要以上に損傷することなく、容易に各アンカー用縦孔を削孔することができ、しかも鋼製筒状体内の空間で行うため、周囲を汚濁することがなく、環境にやさしい工法となっている。
Next, as shown in FIG. 4, an anchor vertical hole excavator 14 including a high-pressure water supply vertical pipe 13 having a high-pressure water injection nozzle 12 at the tip is appropriately guided by a guide jig 15 to be in the space 11. The anchor vertical holes 16 are provided at a predetermined depth in the water blocking layer 10 and the concrete foundation 5 by high-pressure water having a predetermined pressure. The anchor vertical holes 16 are provided at positions separated from the inner surface of the steel tubular body 3 and the outer surface of the column body portion 2 in the radial direction.
Although not shown, the guide jig 15 is configured by connecting a plurality of vertical guide jig units with bolts, and the lower end portion of the guide jig 15 is an anchor in the bottom water-stopping layer 10. The guide jig 15 is adjusted and seated so as to be positioned in the vicinity of the vertical hole 16 for use, and the upper end side of the guide jig 15 is appropriately connected to the columnar structure 1 (not shown) so as to hold a predetermined position. An annular guide member 17 is provided at an intermediate portion of the guide jig 15, and the high-pressure water supply vertical pipe 13 connected to a high-pressure water supply source (device) via a high-pressure hose or the like is provided in the guide member. The high-pressure water injection nozzle 12 at the tip of the high-pressure water supply vertical pipe is positioned at a predetermined position. The vertical pipe 13 for supplying high pressure water is formed by appropriately adding pipes.
When high-pressure water is injected from the high-pressure water injection nozzle 12, the high-pressure water does not include abrasives (or abrasives) so as not to cut the reinforcing bars in the concrete foundation 5, and by a water jet method using a predetermined injection pressure. The anchor vertical holes 16 are formed by excavating only the concrete portion and extending over the water-stopping layer 10 and the concrete foundation 5, and the anchor vertical holes 16 are equiangularly spaced in the circumferential direction. Is formed.
As mentioned above, the hole is drilled by the water jet method, so it does not damage reinforcing materials (mainly reinforcing bars, steel fittings, welds) including steel bars in existing columnar structures, and pinpoints. Since the vertical holes for anchors can be drilled in the existing columnar structures, the vertical holes for anchors can be easily drilled without damaging the existing columnar structures more than necessary. This is an environmentally friendly method that does not pollute the surroundings.
図5及び図6に示すように、鋼製筒状体3の内側において、前記のアンカー用縦孔16は、柱状構造物1の周方向に間隔をおいて、柱状構造物1の全周に渡って、前記コンクリート基礎5に多数設けられている。アンカー用縦孔16を設ける数は、柱状構造物1の横断面形態、補強設計条件等により、適宜設定される。   As shown in FIG. 5 and FIG. 6, the anchor vertical holes 16 are provided in the entire circumference of the columnar structure 1 at intervals in the circumferential direction of the columnar structure 1 inside the steel tubular body 3. A large number are provided on the concrete foundation 5. The number of the anchor vertical holes 16 is appropriately set depending on the cross-sectional shape of the columnar structure 1, the reinforcing design conditions, and the like.
前記の空間11内の水は排水されてドライな状態とされる。その後、図7及び図8に示すように、棒状鋼材が吊り降ろされて、前記各アンカー用縦孔16にそれぞれ棒状鋼材19の下端側が挿入配置されて、図9(又は図1)に示すように、前記アンカー用縦孔内に充填されたエポキシ樹脂等の接着剤18により、前記棒状鋼材19の下端部が固定されている。
前記の接着剤18の充填にあたっては、適宜、接着剤供給用縦管(図示を省略)の先端がアンカー用縦孔内に位置するようにされて充填することでもよい。この場合に、前記の棒状鋼材19をガイド部材として利用して接着剤供給用縦管を吊り降ろすようにしてもよい。
前記の棒状鋼材19としては、異径鉄筋又は異径棒鋼等の市販の棒状鋼材19を用いると安価である。前記の棒状鋼材19は、図11に示すように、適宜、両端部に雄ねじ軸部を有する棒状短尺鋼材19aを、雌ねじ孔を有する鋼製等の連結スリーブ20により連結して形成するようにしてもよく、両端部に接続用のネジ部を有する短尺棒状鋼材相互又は、雌ねじ孔を有する鋼製スリーブ等の接続金具を用いて、短尺棒状鋼材相互を接続する形態としてもよい。前記の棒状鋼材19は、一端側に雄ねじ部を有し他端側に雌ねじ孔を有する短尺鋼製ロッドを連結した形態であってもよい。
The water in the space 11 is drained to a dry state. Thereafter, as shown in FIGS. 7 and 8, the rod-shaped steel material is suspended, and the lower end side of the rod-shaped steel material 19 is inserted and arranged in each of the anchor vertical holes 16, as shown in FIG. 9 (or FIG. 1). Further, the lower end portion of the rod-shaped steel material 19 is fixed by an adhesive 18 such as an epoxy resin filled in the anchor vertical holes.
In filling the adhesive 18, the tip of an adhesive supply vertical pipe (not shown) may be appropriately filled in the anchor vertical hole. In this case, the vertical pipe for supplying adhesive may be suspended by using the rod-shaped steel material 19 as a guide member.
As the rod-shaped steel material 19, it is inexpensive to use a commercially available rod-shaped steel material 19 such as a different diameter steel bar or a different diameter steel bar. As shown in FIG. 11, the rod-shaped steel material 19 is suitably formed by connecting rod-shaped short steel materials 19a having male screw shafts at both ends by a connection sleeve 20 made of steel or the like having female screw holes. Alternatively, the short bar-shaped steel materials may be connected to each other by using a short bar-shaped steel material having connecting thread portions at both ends or a connecting metal fitting such as a steel sleeve having a female screw hole. The rod-shaped steel material 19 may have a form in which a short steel rod having a male screw portion on one end side and a female screw hole on the other end side is connected.
前記の各棒状鋼材19の下端部がコンクリート基礎5に定着された状態で、前記空間内に、図1に示すように、コンクリートあるいは無収縮モルタル等のモルタルからなるセメント系充填材21が充填されて硬化されて、柱状構造物1が補強されている。
図示の形態では、図10に示すように、圧入装置8における加圧部材9及び伸縮式ジャッキ7並びにジャッキ取り付け部材22等が取り外された後、柱状構造物1の柱体部分2の上端付近まで、棒状短尺鋼材19a及び鋼板製ブロック6が順次継ぎ足されて、鋼製筒状体3及び縦向きに棒状鋼材19が形成され、さらに、コンクリート又は無収縮モルタル等のセメント系充填材21aがさらに充填・硬化されて、柱体部分2の上端部付近まで補強されている。圧入装置8としては、適宜、他の公知の圧入装置を用いるようにしてもよい。
As shown in FIG. 1, the cement-based filler 21 made of mortar such as concrete or non-shrink mortar is filled in the space in a state where the lower end portion of each bar-shaped steel material 19 is fixed to the concrete foundation 5. Thus, the columnar structure 1 is reinforced.
In the illustrated form, as shown in FIG. 10, after the pressurizing member 9, the telescopic jack 7, the jack mounting member 22, and the like in the press-fitting device 8 are removed, to the vicinity of the upper end of the column body portion 2 of the columnar structure 1. The rod-shaped short steel material 19a and the steel plate block 6 are sequentially added to form the steel tubular body 3 and the rod-shaped steel material 19 in the vertical direction, and further filled with a cement-based filler 21a such as concrete or non-shrink mortar. -It is hardened and reinforced up to the vicinity of the upper end of the column part 2. As the press-fitting device 8, other known press-fitting devices may be used as appropriate.
前記のように補強された柱状構造物1に地震時に水平力が作用した場合には、前記棒状鋼材19が、水平方向のせん断力に抵抗できるため、柱体部分2下端部とコンクリート基礎5との接合部付近のせん断抵抗力を格段に高めることができる。   When a horizontal force is applied to the columnar structure 1 reinforced as described above at the time of an earthquake, the bar-shaped steel material 19 can resist the horizontal shearing force. The shear resistance in the vicinity of the joint portion can be significantly increased.
前記のように、実施形態の柱状構造物の補強構造では、柱状構造物1における柱体部分2から離れた状態で鋼製筒状体3が地盤4に圧入されて、前記柱状構造物1におけるコンクリート基礎5に設置され、前記柱体部分2とその外側の鋼製筒状体3との間の土砂を排出した空間11内におけるコンクリート基礎5上に止水層10が設けられて鋼製筒状体3の下端内側が止水され、前記止水層10及びコンクリート基礎5に渡ってアンカー用縦孔16が柱体部分2の周方向に間隔をおいて複数設けられ、前記各アンカー用縦孔16にそれぞれ棒状鋼材19の下端側が挿入配置されてアンカー用縦孔16内に充填された接着剤18により固定され、前記棒状鋼材19を埋め込むように、前記空間11にセメント系充填材21が充填されているので、鉄筋等の安価な棒状鋼材19の下端部をコンクリート基礎5に確実に固定しているため、地震時における水平力が作用した場合のせん断抵抗力を格段に高めて補強することができる等の効果が得られる。
また、前記実施形態の柱状構造物の補強方法では、柱状構造物1における柱体部分2から離れた状態で鋼製筒状体3を地盤4に圧入して、前記柱状構造物1におけるコンクリート基礎5に設置し、前記柱体部分2とその外側の鋼製筒状体3との間の土砂を排出した空間11内におけるコンクリート基礎5上に止水層10を設け、前記止水層10及びコンクリート基礎5に渡ってアンカー用縦孔16を柱体部分2の周方向に間隔をおいて複数設け、前記各アンカー用縦孔16にそれぞれ棒状鋼材19の下端側を挿入配置してアンカー用縦孔16内に充填された接着剤18により固定した後、前記棒状鋼材19を埋め込むように、前記空間11にセメント系充填材21を充填するので、鉄筋等の安価な棒状鋼材19の下端部をコンクリート基礎5に確実に固定して、地震時における水平力が作用した場合のせん断抵抗力を格段に高めた状態で補強することができ、施工も容易である等の効果が得られる。
また、前記実施形態の柱状構造物の補強方法では、止水層10を設けた後、空間をドライとした状態で、各アンカー用縦孔16にそれぞれ棒状鋼材19の下端側を挿入配置してアンカー用縦孔16内に充填した接着剤18により固定した後、前記棒状鋼材19を埋め込むように、前記空間11にセメント系充填材21を充填するので、棒状鋼材19の下端側をコンクリート基礎5のアンカー用縦孔16に確実に固定することができる等の効果が得られる。
また、前記実施形態の柱状構造物の補強方法では、棒状鋼材19は、順次短尺鋼材が継ぎ足されて形成されるので、柱状構造物1の補強高さ範囲に適宜対応して補強することができる等の効果が得られる。
さらに前記実施形態の柱状構造物の補強方法では、鋼製筒状体3は、その上部に複数の鋼板製ブロック6が筒状に順次継ぎ足されて形成されるので、鋼製筒状体3の形成が容易である等の効果が得られる。
As described above, in the columnar structure reinforcing structure of the embodiment, the steel tubular body 3 is press-fitted into the ground 4 in a state of being separated from the columnar portion 2 in the columnar structure 1, and A water-stopping layer 10 is provided on the concrete foundation 5 in the space 11 that is installed on the concrete foundation 5 and discharges the earth and sand between the column portion 2 and the steel tubular body 3 outside thereof. The inside of the lower end of the rod-shaped body 3 is water-stopped, and a plurality of anchor vertical holes 16 are provided at intervals in the circumferential direction of the column body portion 2 across the water-stopping layer 10 and the concrete foundation 5. The lower end side of the rod-shaped steel material 19 is inserted and arranged in each hole 16 and fixed by an adhesive 18 filled in the anchor vertical hole 16, and a cement-based filler 21 is embedded in the space 11 so as to embed the rod-shaped steel material 19. Because it is filled Since the lower end of an inexpensive bar-shaped steel material 19 such as a reinforcing bar is securely fixed to the concrete foundation 5, the effect of being able to reinforce the shear resistance when a horizontal force is applied during an earthquake can be reinforced. Is obtained.
In the method for reinforcing a columnar structure according to the embodiment, the steel tubular body 3 is press-fitted into the ground 4 in a state of being separated from the columnar portion 2 in the columnar structure 1, and the concrete foundation in the columnar structure 1. 5, a water-stopping layer 10 is provided on the concrete foundation 5 in the space 11 in which the earth and sand between the columnar portion 2 and the steel tubular body 3 outside thereof are discharged, and the water-stopping layer 10 and A plurality of anchor vertical holes 16 are provided across the concrete foundation 5 at intervals in the circumferential direction of the column portion 2, and the lower end side of the bar-shaped steel material 19 is inserted and arranged in each of the anchor vertical holes 16. After fixing with the adhesive 18 filled in the hole 16, the space 11 is filled with the cement-based filler 21 so as to embed the rod-shaped steel material 19. Therefore, the lower end portion of the inexpensive rod-shaped steel material 19 such as a reinforcing bar is attached to the space 11. Concrete foundation 5 Securely fixed, horizontal forces can be reinforced in a state of greatly increased shear resistance force when acted upon earthquakes, effects equal construction is easy to obtain.
Further, in the method for reinforcing a columnar structure according to the embodiment, after providing the water blocking layer 10, the lower end side of the rod-shaped steel material 19 is inserted and arranged in each anchor vertical hole 16 in a state where the space is dry. After fixing with the adhesive 18 filled in the anchor vertical holes 16, the space 11 is filled with the cement filler 21 so as to embed the rod steel material 19, so that the lower end side of the rod steel material 19 is placed on the concrete foundation 5. The effect that it can be reliably fixed to the vertical hole 16 for the anchor is obtained.
Further, in the columnar structure reinforcement method of the above embodiment, the rod-shaped steel material 19 is formed by sequentially adding short steel materials, so that it can be reinforced corresponding to the reinforcement height range of the columnar structure 1 as appropriate. Etc. are obtained.
Furthermore, in the columnar structure reinforcing method of the above embodiment, the steel tubular body 3 is formed by sequentially adding a plurality of steel plate blocks 6 to the upper portion of the steel tubular body 3 in a cylindrical shape. Effects such as easy formation can be obtained.
前記実施形態のように、棒状鋼材19の先端部をアンカー用縦孔16内に配置して接着剤18により埋め込む形態では、アンカー用縦孔16の直径を小さくすることができる。また、本発明では、棒状鋼材19の先端部に定着プレートを設けていないので、アンカー用縦孔16の直径が大きくなることはなく、コンクリート基礎5内の鉄筋を切断する必要もなく、アンカー用縦孔16を形成することができ、棒状鋼材19の先端部のみを確実に定着させることができる。   In the embodiment in which the tip end portion of the rod-shaped steel material 19 is disposed in the anchor vertical hole 16 and embedded with the adhesive 18 as in the above embodiment, the diameter of the anchor vertical hole 16 can be reduced. Further, in the present invention, since the fixing plate is not provided at the tip of the rod-shaped steel material 19, the diameter of the anchor vertical hole 16 does not increase, it is not necessary to cut the reinforcing bar in the concrete foundation 5, and the anchor The vertical hole 16 can be formed, and only the tip of the rod-shaped steel material 19 can be reliably fixed.
本発明を実施する場合、高圧水供給用縦管に代えて、高圧水供給用ホースを用いるようにしてもよい。
前記実施形態のように、棒状鋼材は、順次短尺鋼材が継ぎ足されて形成されると、柱状構造物の補強高さ範囲に適宜対応して補強することができる。
When practicing the present invention, a high-pressure water supply hose may be used instead of the high-pressure water supply vertical pipe.
As in the above embodiment, the rod-shaped steel material can be reinforced in accordance with the reinforcing height range of the columnar structure as long as the short steel materials are successively added.
1 柱状構造物
2 柱体部分
3 鋼製筒状体
4 地盤
5 コンクリート基礎
6 鋼板製ブロック
7 伸縮式ジャッキ
8 圧入装置
9 加圧部材
10 止水層
11 空間
12 高圧水噴射ノズル
13 高圧水供給用縦管
14 アンカー用縦孔掘削装置
15 ガイド治具
16 アンカー用縦孔
17 ガイド部材
18 接着剤
19 棒状鋼材
19a 棒状短尺鋼材
20 連結スリーブ
21 セメント系充填材
21a セメント系充填材
22 ジャッキ取り付け部材
23 組立式浮体
DESCRIPTION OF SYMBOLS 1 Columnar structure 2 Column part 3 Steel tubular body 4 Ground 5 Concrete foundation 6 Steel plate block 7 Telescopic jack 8 Press-fitting device 9 Pressurizing member 10 Water stop layer 11 Space 12 High pressure water injection nozzle 13 High pressure water supply Vertical pipe 14 Anchor vertical hole excavator 15 Guide jig 16 Anchor vertical hole 17 Guide member 18 Adhesive 19 Bar-shaped steel material 19a Bar-shaped short steel material 20 Connecting sleeve 21 Cement-based filler 21a Cement-based filler 22 Jack mounting member 23 Assembly Floating body
前記の課題を有利に解決するために、第1発明の柱状構造物の補強構造では、柱状構造物における柱体部分から離れた状態で鋼製筒状体が地盤に圧入されて、前記柱状構造物におけるコンクリート基礎に設置され、前記鋼製筒状体は、柱状構造物の周囲に設けた組立式浮体上の作業員により鋼板製ブロックを上部に溶接により継ぎ足すことを繰り返すことで形成された鋼製筒状体であり、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層が設けられて鋼製筒状体の下端内側が止水され、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔が柱体部分の周方向に間隔をおいて複数設けられ、前記各アンカー用縦孔は、下端部が前記止水層に着座されたガイド治具によりガイドされて前記空間内に配置された高圧水供給用縦管における先端の高圧水噴射ノズルから噴射された研削材を含まない高圧水によるウォータージェット工法により削孔されたアンカー用縦孔であり、かつ前記各アンカー用縦孔は、前記鋼製筒状体の内側面及び前記柱体部分の外周面から離れた位置に設けられたアンカー用縦孔であり、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側が挿入配置されてアンカー用縦孔内に充填された接着剤により固定され、前記各棒状鋼材は、前記鋼製筒状体の内側面及び前記柱体部分の外周面から離れた位置に設けられ、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材が充填されていることを特徴とする。
また、第2発明の柱状構造物の補強方法では、第1発明の柱状構造物の補強構造を構築するための柱状構造物の補強方法であって、柱状構造物における柱体部分から離れた状態で鋼製筒状体を地盤に圧入して、前記柱状構造物におけるコンクリート基礎に設置し、前記鋼製筒状体は、柱状構造物の周囲に設けた組立式浮体上の作業員により鋼板製ブロックを上部に溶接により継ぎ足すことを繰り返すことで形成した鋼製筒状体であり、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層を設けて鋼製筒状体の下端内側を止水し、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔を柱体部分の周方向に間隔をおいて複数設け、前記各アンカー用縦孔は、下端部が前記止水層に着座されたガイド治具によりガイドされて前記空間内に配置された高圧水供給用縦管における先端の高圧水噴射ノズルから噴射された研削材を含まない高圧水によるウォータージェット工法により削孔されたアンカー用縦孔であり、かつ前記各アンカー用縦孔は、前記鋼製筒状体の内側面及び前記柱体部分の外周面から離れた位置に設けられたアンカー用縦孔であり、前記空間をドライとした状態で、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置すると共に前記各棒状鋼材を、前記鋼製筒状体の内側面及び前記柱体部分の外周面から離れた位置に設けてアンカー用縦孔内に充填された接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填することを特徴とする。
第3発明の柱状構造物の補強方法では、第2発明の柱状構造物の補強方法において、鋼製筒状体は、複数の鋼板ブロックが筒状に順次継ぎ足されて形成されることを特徴とする。
In order to advantageously solve the above-described problem, in the columnar structure reinforcement structure according to the first aspect of the present invention, the steel tubular body is press-fitted into the ground in a state of being separated from the columnar portion of the columnar structure, and the columnar structure is provided. The steel cylinder was installed on the concrete foundation in the object, and was formed by repeatedly adding a steel plate block to the upper part by welding by an operator on an assembly-type floating body provided around the columnar structure. A steel tubular body, a water-stopping layer is provided on the concrete foundation in the space where the earth and sand between the column body portion and the outer steel tubular body are discharged, and the lower end of the steel tubular body inside is water stop, the waterproofing layer and the longitudinal hole for the anchor over the concrete foundation is provided with a plurality at intervals in the circumferential direction of the column body portion, said longitudinal hole for each anchor has a lower end portion said waterproofing Guided by a guide jig seated on the layer Anchor vertical holes drilled by a water jet method using high-pressure water that does not include abrasives injected from a high-pressure water injection nozzle at the tip of the vertical pipe for supplying high-pressure water disposed in the space, and The vertical holes for anchors are vertical holes for anchors provided at positions away from the inner side surface of the steel tubular body and the outer peripheral surface of the column part, and the lower ends of the rod-shaped steel members are respectively provided in the vertical holes for anchors. Sides are inserted and fixed by an adhesive filled in the anchor vertical holes, and each of the rod-shaped steel members is provided at a position away from the inner side surface of the steel tubular body and the outer peripheral surface of the column body part. The space is filled with a cement filler so as to embed the rod-shaped steel material.
The columnar structure reinforcing method according to the second invention is a columnar structure reinforcing method for constructing the columnar structure reinforcing structure according to the first invention, wherein the columnar structure is separated from the column part in the columnar structure. The steel tubular body is press-fitted into the ground and installed on the concrete foundation in the columnar structure, and the steel tubular body is made of a steel plate by an operator on an assembly type floating body provided around the columnar structure. A steel tubular body formed by repeatedly adding a block to the upper part by welding, on a concrete foundation in the space where the earth and sand between the column portion and the outer steel tubular body is discharged the provided waterproofing layer lower end inside the steel tubular body and the water stop, several spaced vertical holes for anchoring the circumferential direction of the column body portion over the waterproofing layer and the concrete foundation, the Each anchor vertical hole has a lower end seated on the water stop layer Anchors drilled by a water jet method using high-pressure water that does not include abrasives that are ejected from a high-pressure water injection nozzle at the tip of a vertical pipe for supplying high-pressure water that is guided by a guide jig and disposed in the space And each of the anchor vertical holes is an anchor vertical hole provided at a position away from the inner surface of the steel tubular body and the outer peripheral surface of the column portion, and the space In a dry state, the lower end side of each bar-shaped steel material is inserted and arranged in each of the anchor vertical holes, and each bar-shaped steel material is separated from the inner side surface of the steel tubular body and the outer peripheral surface of the column body part. The space is filled with a cement-type filler so as to embed the rod-shaped steel material after being fixed with an adhesive filled in the anchor vertical hole.
The reinforcing method of the third shot bright columnar structures, in reinforcing method of the second shot bright columnar structures, steel cylindrical body, that the plurality of steel plates blocks are formed in sequence spliced to the tubular Features.
第1発明によると、柱状構造物における柱体部分から離れた状態で鋼製筒状体が地盤に圧入されて、前記柱状構造物におけるコンクリート基礎に設置され、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層が設けられて鋼製筒状体の下端内側が止水され、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔が柱体部分の周方向に間隔をおいて複数設けられ、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側が挿入配置されてアンカー用縦孔内に充填された接着剤により固定され、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材が充填されているので、鉄筋等の安価な棒状鋼材の下端部をコンクリート基礎に確実に固定しているため、地震時における水平力が作用した場合のせん断抵抗力を格段に高めて補強することができる等の効果が得られる。
また、第2発明の柱状構造物の補強方法では、第1発明の柱状構造物の補強構造を構築するための柱状構造物の補強方法であって、柱状構造物における柱体部分から離れた状態で鋼製筒状体を地盤に圧入して、前記柱状構造物におけるコンクリート基礎に設置し、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層を設けて鋼製筒状体の下端内側を止水し、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔を柱体部分の周方向に間隔をおいて複数設け、前記空間をドライとした状態で、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置してアンカー用縦孔内に充填された接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填するので、鉄筋等の安価な棒状鋼材の下端部をコンクリート基礎に確実に固定して、地震時における水平力が作用した場合のせん断抵抗力を格段に高めた状態で補強することができ、施工も容易である等の効果が得られる。
また、止水層を設けた後、空間をドライとした状態で、各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置してアンカー用縦孔内に充填した接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填するので、棒状鋼材の下端側をコンクリート基礎のアンカー用縦孔に確実に固定することができる等の効果が得られる。
発明の柱状構造物の補強方法では、前記各アンカー用縦孔はウォータージェット工法により削孔されるので、既設柱状構造物における鉄筋を含む鋼材等の補強材料を損傷することなく、しかもピンポイントでアンカー用縦孔を既設柱状構造物に削孔できるため、既設柱状構造物を必要以上に損傷することなく、容易に各アンカー用縦孔を削孔することができ、しかも鋼製筒状体内の空間で行うため、周囲を汚濁することがなく、環境にやさしい工法となっている等の効果が得られる。
発明の柱状構造物の補強方法では、鋼製筒状体は、その上部に複数の鋼板ブロックが筒状に順次継ぎ足されて形成されるので、鋼製筒状体の形成が容易である等の効果が得られる。
According to the first invention, the steel tubular body is press-fitted into the ground in a state of being separated from the column portion in the columnar structure, and is installed on the concrete foundation in the columnar structure, and the column portion and the steel on the outside thereof. A water blocking layer is provided on the concrete foundation in the space where the earth and sand between the cylindrical body is discharged, and the inside of the lower end of the steel cylindrical body is water stopped, and the anchor extends across the water blocking layer and the concrete foundation. A plurality of vertical holes are provided at intervals in the circumferential direction of the column portion, and the lower end side of the bar-shaped steel material is inserted into each of the anchor vertical holes and fixed by an adhesive filled in the anchor vertical holes. Since the space is filled with cement filler so as to embed the rod-shaped steel material, the lower end of an inexpensive rod-shaped steel material such as a reinforcing bar is securely fixed to the concrete foundation. Made Effects such as shear resistance in the case of can be reinforced greatly enhanced can be obtained.
The columnar structure reinforcing method according to the second invention is a columnar structure reinforcing method for constructing the columnar structure reinforcing structure according to the first invention, wherein the columnar structure is separated from the column part in the columnar structure. The concrete foundation in the space where the steel tubular body is press-fitted into the ground, installed on the concrete foundation in the columnar structure, and the earth and sand between the columnar portion and the steel tubular body on the outside is discharged. A water stop layer is provided on the bottom end of the steel tubular body to stop water, and a plurality of vertical holes for anchors are provided at intervals in the circumferential direction of the column portion over the water stop layer and the concrete foundation, In a state where the space is dry, the lower end side of the bar-shaped steel material is inserted and arranged in each anchor vertical hole and fixed with an adhesive filled in the anchor vertical hole, and then the bar-shaped steel material is embedded. Fill the space with cement filler. Therefore, the lower end of an inexpensive bar-shaped steel material such as a reinforcing bar can be securely fixed to the concrete foundation, and the shear resistance can be reinforced in the state where the horizontal force is applied during an earthquake. Can be obtained.
In addition, after providing the water-stopping layer, in a state where the space is dry, the lower end side of the rod-shaped steel material is inserted and arranged in each anchor vertical hole and fixed with an adhesive filled in the anchor vertical hole, Since the cement-type filler is filled in the space so as to embed the rod-shaped steel material, it is possible to obtain an effect that the lower end side of the rod-shaped steel material can be reliably fixed to the vertical hole for the anchor of the concrete foundation.
In the columnar structure reinforcing method according to the second aspect of the present invention, since each of the anchor vertical holes is drilled by the water jet method, the reinforcing material such as steel including reinforcing bars in the existing columnar structure is not damaged, and the pin Since the vertical holes for anchors can be drilled in the existing columnar structures at points, the vertical holes for anchors can be easily drilled without damaging the existing columnar structures more than necessary, and steel cylinders Since it is performed in the body space, the surroundings are not polluted, and an effect such as an environmentally friendly construction method can be obtained.
In the method for reinforcing a columnar structure according to the third aspect of the invention, the steel tubular body is formed by sequentially adding a plurality of steel plate blocks to the upper part thereof in a tubular shape, so that the steel tubular body can be easily formed. Etc. are obtained.

Claims (4)

  1. 柱状構造物における柱体部分から離れた状態で鋼製筒状体が地盤に圧入されて、前記柱状構造物におけるコンクリート基礎に設置され、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層が設けられて鋼製筒状体の下端内側が止水され、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔が柱体部分の周方向に間隔をおいて複数設けられ、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側が挿入配置されてアンカー用縦孔内に充填された接着剤により固定され、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材が充填されていることを特徴とする柱状構造物の補強構造。   A steel tubular body is press-fitted into the ground in a state of being separated from the columnar part in the columnar structure, and is installed on a concrete foundation in the columnar structure, and the columnar part and the steel tubular body outside thereof A water-stopping layer is provided on the concrete foundation in the space where the earth and sand are discharged in between, and the inner bottom end of the steel tubular body is water-stopped, and the anchor vertical holes are pillars across the water-stopping layer and the concrete foundation. A plurality of spacers are provided at intervals in the circumferential direction, and the lower end side of the rod-shaped steel material is inserted and arranged in each anchor vertical hole and fixed by an adhesive filled in the anchor vertical hole, and the rod-shaped steel material is embedded. As described above, a reinforcing structure for a columnar structure, wherein the space is filled with a cement filler.
  2. 請求項1に記載の柱状構造物の補強構造を構築するための柱状構造物の補強方法であって、柱状構造物における柱体部分から離れた状態で鋼製筒状体を地盤に圧入して、前記柱状構造物におけるコンクリート基礎に設置し、前記柱体部分とその外側の鋼製筒状体との間の土砂を排出した空間内におけるコンクリート基礎上に止水層を設けて鋼製筒状体の下端内側を止水し、前記止水層及びコンクリート基礎に渡ってアンカー用縦孔を柱体部分の周方向に間隔をおいて複数設け、前記空間をドライとした状態で、前記各アンカー用縦孔にそれぞれ棒状鋼材の下端側を挿入配置してアンカー用縦孔内に充填された接着剤により固定した後、前記棒状鋼材を埋め込むように、前記空間にセメント系充填材を充填することを特徴とする柱状構造物の補強方法。   A columnar structure reinforcement method for constructing a columnar structure reinforcement structure according to claim 1, wherein a steel tubular body is press-fitted into the ground in a state of being separated from a column part in the columnar structure. The steel cylinder is provided with a water-stopping layer on the concrete foundation in the space where the earth and sand between the pillar part and the outer steel cylinder are discharged from the concrete foundation in the columnar structure. In the state where the lower end inside of the body is water-stopped, a plurality of vertical holes for anchors are provided at intervals in the circumferential direction of the column body portion across the water-stopping layer and the concrete foundation, and the space is dry. After the lower end side of the rod-shaped steel material is inserted and arranged in each vertical hole and fixed with an adhesive filled in the anchor vertical hole, the space is filled with a cement filler so as to embed the rod-shaped steel material. Of columnar structures characterized by Method.
  3. 前記各アンカー用縦孔はウォータージェット工法により削孔されることを特徴とする請求項2に記載の柱状構造物の補強方法。   The columnar structure reinforcing method according to claim 2, wherein each of the anchor vertical holes is drilled by a water jet method.
  4. 鋼製筒状体は、複数の鋼板ブロックが筒状に順次継ぎ足されて形成されることを特徴とする請求項2又は3に記載の柱状構造物の補強方法。   The method for reinforcing a columnar structure according to claim 2 or 3, wherein the steel tubular body is formed by sequentially adding a plurality of steel plate blocks into a tubular shape.
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JP2014141829A (en) * 2013-01-24 2014-08-07 Oriental Shiraishi Corp Reinforcement structure and reinforcement method for columnar structure
JP2014148846A (en) * 2013-02-01 2014-08-21 East Japan Railway Co Bridge pier reinforcement structure and bridge pier reinforcement method
CN104294769A (en) * 2014-09-16 2015-01-21 杭州江润科技有限公司 Built abutment structure reinforced through combination of pile supplementing and abutment cap enlarging and construction method
JP2016217016A (en) * 2015-05-21 2016-12-22 株式会社奥村組 Structure and method for reinforcing existing column

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