JP5101961B2 - Seismic strengthened steel plate installation method for columnar structures - Google Patents

Seismic strengthened steel plate installation method for columnar structures Download PDF

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JP5101961B2
JP5101961B2 JP2007244151A JP2007244151A JP5101961B2 JP 5101961 B2 JP5101961 B2 JP 5101961B2 JP 2007244151 A JP2007244151 A JP 2007244151A JP 2007244151 A JP2007244151 A JP 2007244151A JP 5101961 B2 JP5101961 B2 JP 5101961B2
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steel plate
reinforcing steel
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bottom plate
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JP2009074293A (en
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貴浩 菅野
将志 小林
薫 笠原
伸二 松尾
大輔 池津
浩一 松本
和明 幸田
透 笹川
敬 北村
大輔 土田
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East Japan Railway Co
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本発明は高架橋柱や橋脚等の柱状構造物の耐震補強鋼板設置方法に関する。   The present invention relates to a method for installing a seismic reinforced steel plate for a columnar structure such as a viaduct or a bridge pier.

躯体が土中に埋まる高架橋柱や橋脚等の柱状構造物の地中部の耐震補強法として、躯体周辺の土中部を掘削して仮土留めを施工し、補強鋼板を設置し、躯体と補強鋼板の隙間に充填材を充填する工法が知られている。この一般的な工法においては、躯体周辺の土砂を掘削するとともに、仮土留めを必要とするため補強鋼板設置作業に多くの労力が必要となる。   As a seismic reinforcement method for underground structures such as viaduct columns and bridge piers where the frame is buried in the soil, excavation of the soil around the frame and construction of temporary earth retaining, installation of the reinforcing steel plate, the frame and the reinforcing steel plate There is known a method of filling the gaps with a filler. In this general construction method, the earth and sand around the frame are excavated and temporary earth retaining is required, so that much labor is required for the installation work of the reinforcing steel plate.

また、土中部の掘削を低減するために、端部に継手を有する補強鋼板同士を順次つなぎ合わせて圧入し、閉合した補強鋼板と躯体との間の土砂を掘削して充填材を充填する工法も知られている。具体的には、図20、図21に示すように、橋脚躯体1の周辺の地表面3を通してフーチング2の位置まで補強鋼板4を順次圧入して閉合し、閉合した補強鋼板4と橋脚躯体1との間の土砂を取り除いた後、充填材5を充填する工法がある。   In addition, in order to reduce excavation in the soil, a method of filling and filling the filler by excavating the sand between the closed reinforcing steel plate and the frame by sequentially connecting and press-fitting reinforcing steel plates having joints at the ends. Is also known. Specifically, as shown in FIGS. 20 and 21, the reinforcing steel plate 4 is sequentially press-fitted through the ground surface 3 around the pier housing 1 to the position of the footing 2 to be closed, and the closed reinforcing steel plate 4 and the pier housing 1 are closed. There is a method of filling the filler 5 after removing the earth and sand between the two.

図20、図21に示す工法において、補強鋼板圧入設置後に躯体と補強鋼板の隙間の土砂を確実に掘削して充填材を充填するために、躯体との間に一定の間隔をあけて補強鋼板を圧入したとき、図示するように、地中支障物6がある場合には、補強鋼板の下端が支障を受けて所定の深さまで圧入することができず、鋼板の設置位置も定まりにくい。また、補強鋼板と橋脚躯体の隙間に残る土砂7が補強鋼板と躯体との間に挟まってその掘削作業が困難となってしまう。   In the method shown in FIGS. 20 and 21, in order to reliably excavate the soil in the gap between the frame and the reinforcing steel plate after the press-fit installation of the reinforcing steel plate and to fill the filler, the reinforcing steel plate is spaced a certain distance from the frame. As shown in the figure, when there is an underground obstacle 6, as shown in the figure, the lower end of the reinforcing steel plate is hindered and cannot be press-fitted to a predetermined depth, and the installation position of the steel plate is not easily determined. Further, the earth and sand 7 remaining in the gap between the reinforcing steel plate and the pier frame is sandwiched between the reinforcing steel plate and the frame, and the excavation work becomes difficult.

本発明は上記課題を解決しようとするものであり、地中構造物に対する補強鋼板の圧入により支障物を排除し、また、鋼板設置精度を確保するとともに、土砂掘削の簡素化を図ることを目的とする。
本発明は、端部に継手を有する補強鋼板を建て込んで巻き立て、閉合した補強鋼板と柱状構造物躯体との間に充填材を充填する耐震補強方法において、
補強鋼板の下端部に底板を形成するともともに、補強鋼板下端部と底板に跨がって躯体と補強鋼板との間隔を保持する間隔材を形成し、底板先端を躯体に近接または当接させて補強鋼板を地中へ圧入し、躯体と補強鋼板との間の支障物を排除することを特徴とする。
また、本発明は、前記間隔材を複数形成したことを特徴とする。
また、本発明は、前記底板の先端部を下方へ傾斜させ、補強鋼板の圧入により支障物を排除することを特徴とする。
また、本発明は、端部に継手を有する補強鋼板を建て込んで巻き立て、閉合した補強鋼板と柱状構造物躯体との間に充填材を充填する耐震補強方法において、
躯体と補強鋼板との間隔を保持する間隔材を、その下辺を躯体側へ向けて下方へ傾斜するように補強鋼板下端部に形成し、補強鋼板を地中へ圧入することを特徴とする。
また、本発明は、前記間隔材を複数形成することを特徴とする。
また、本発明は、端部に継手を有する補強鋼板を建て込んで巻き立て、閉合した補強鋼板と柱状構造物躯体との間に充填材を充填する耐震補強方法において、
補強鋼板下端部を斜めにカットして躯体に対向して補強鋼板を圧入し、カットした傾斜部で支障物を排除することを特徴とする。
また、本発明は、カットした傾斜部に沿って底板を形成し、底板先端を躯体に近接または当接させて補強鋼板を地中へ圧入することを特徴とする。
The present invention is intended to solve the above-mentioned problems, and aims to eliminate obstacles by press-fitting a reinforced steel plate into an underground structure, to ensure the accuracy of steel plate installation, and to simplify sediment excavation. And
The present invention is a seismic reinforcement method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A bottom plate is formed at the lower end of the reinforcing steel plate, and a spacing member is formed to maintain the distance between the casing and the reinforcing steel plate across the lower end of the reinforcing steel plate and the bottom plate, and the bottom plate tip is brought close to or in contact with the casing. The reinforced steel sheet is press-fitted into the ground to eliminate obstacles between the frame and the reinforced steel sheet.
The present invention is characterized in that a plurality of the spacing members are formed.
Moreover, the present invention is characterized in that the front end portion of the bottom plate is inclined downward and obstacles are eliminated by press-fitting a reinforcing steel plate.
Further, the present invention relates to a seismic reinforcement method in which a reinforcing steel plate having a joint at an end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A spacing member that maintains the spacing between the casing and the reinforcing steel plate is formed at the lower end of the reinforcing steel plate so that the lower side is inclined downward toward the casing side, and the reinforcing steel plate is press-fitted into the ground.
The present invention is characterized in that a plurality of the spacing members are formed.
Further, the present invention relates to a seismic reinforcement method in which a reinforcing steel plate having a joint at an end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
The lower end portion of the reinforcing steel plate is cut obliquely, the reinforcing steel plate is press-fitted facing the housing, and obstacles are eliminated by the cut inclined portion.
Further, the present invention is characterized in that a bottom plate is formed along the cut inclined portion, and a reinforcing steel plate is press-fitted into the ground with the bottom plate tip approaching or contacting the housing.

本発明は、補強鋼板の圧入により支障物を排除するようにしたので、鋼板設置精度が確保できるとともに、土砂掘削の簡素化を図ることが可能である。   In the present invention, obstacles are eliminated by press-fitting a reinforced steel plate, so that the steel plate installation accuracy can be ensured and the sediment excavation can be simplified.

以下、本発明の実施の形態について説明する。なお、以下では橋脚補強を例にとって説明するが、本発明は高架橋柱等、どのような柱状構造物に対しても適用可能である。
図1は先端閉塞型として補強鋼板下端部に底板を形成した例を説明する図である。
端部に継手を有する補強鋼板10の下端部を曲げ加工したり、下端部斜めに板を接合して躯体側に向けて形成した底板20の先端を橋脚躯体1の壁面に当接(先端閉塞型)させる(図1(a))、或いは曲げ加工や斜めに板を接合して躯体側に向けて形成し、先端を上方へ折り曲げた底板21の先端を橋脚躯体1の壁面に当接(先端閉塞型)させる(図1(b))。補強鋼板10の下端部と底板20、21には、橋脚躯体との間隔を保持するために、1つ以上の間隔材40が接合により取付けられている。補強鋼板10を橋脚躯体1に沿って圧入していくと、補強鋼板先端部には矢印A方向に土圧がかかって間隔材40が躯体壁面に押しつけられるが、間隔材40は躯体から矢印Bに示す反力を受けて土圧に対抗し、補強鋼板が躯体側に寄ってしまうことはない。間隔材40としては、補強鋼板と躯体との間に、施工に必要な間隔を保持できる厚みを持たせるようにすればよい。こうして間隔材40と底板20、21の先端とを躯体面に当接させながら補強鋼板10を圧入していくと、支障物6があっても底板20、21により補強鋼板の躯体と反対側(背面側)へ排除することができる。そのため、鋼板設置精度を確保することができ、補強鋼板と躯体との隙間の土砂等も補強鋼板の背面側へほぼ排除できるため掘削作業を簡素化できる。こうして端部に継手を有する補強鋼板10の継手と隣接鋼板の継手とをつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の土砂等を除去した後、コンクリート等を充填することで補強工事は完了する。このように底板を先端閉塞型とすることで、土砂等の流入を防止し、補強鋼板巻き立て後の土砂掘削を容易にする効果が得られる。
Embodiments of the present invention will be described below. In the following, pier reinforcement will be described as an example, but the present invention can be applied to any columnar structure such as a viaduct pillar.
FIG. 1 is a view for explaining an example in which a bottom plate is formed at the lower end of a reinforcing steel plate as a tip closing type.
The lower end of the reinforcing steel plate 10 having a joint at the end is bent, or the end of the bottom plate 20 formed toward the housing side by joining the plates obliquely to the lower end is brought into contact with the wall surface of the pier housing 1 (end closing) (Fig. 1 (a)), or by bending or obliquely joining the plates and forming them toward the housing, the tip of the bottom plate 21 with the tip bent upward is brought into contact with the wall surface of the pier housing 1 ( The tip is closed (FIG. 1B). One or more spacing members 40 are attached to the lower end portion of the reinforcing steel plate 10 and the bottom plates 20 and 21 by bonding in order to maintain the spacing between the pier frame. When the reinforcing steel plate 10 is press-fitted along the pier housing 1, earth pressure is applied to the tip of the reinforcing steel plate in the direction of arrow A, and the spacing member 40 is pressed against the housing wall surface. In response to the reaction force shown in Fig. 1, the reinforced steel plate does not approach the housing side against the earth pressure. What is necessary is just to make it the thickness which can hold | maintain the space | interval required for construction as the space | interval material 40 between a reinforcement steel plate and a housing. Thus, when the reinforcing steel plate 10 is press-fitted while the spacing member 40 and the tips of the bottom plates 20 and 21 are in contact with the housing surface, even if there is an obstacle 6, the bottom plates 20 and 21 are opposite to the reinforcing steel plate housing ( To the rear side). Therefore, steel plate installation accuracy can be ensured, and earth and sand in the gap between the reinforcing steel plate and the frame can be almost eliminated to the back side of the reinforcing steel plate, thereby simplifying excavation work. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed. Thus, by making a bottom plate into a front-end | tip obstruction type, the inflow of earth and sand etc. is prevented and the effect which makes the earth and sand excavation after reinforcement steel plate winding up acquired.

なお、上記説明では補強鋼板下端部に間隔材を設けるようにしたが、補強鋼板の強度が十分あれば間隔材を省略しても底板自体が間隔材の機能も果たし、底板により土砂等を補強鋼板の躯体と反対側(背面側)へ排除することができる。なお、図示するように、底板は躯体側へ向けて先端部を下方へ傾斜させた方が土砂等の排除機能を増大させることができる。また、図1の例は先端閉塞型であるが、先端閉塞型でなくてもよい場合には、底板20、21を設けないようにしてもよく、間隔材40自体が底板の機能を果たし、間隔材により支障物や土砂等を補強鋼板の躯体と反対側(背面側)へ排除することができ、その場合には一層圧入抵抗を減らすことができる。   In the above description, the spacing material is provided at the lower end of the reinforcing steel plate. However, if the strength of the reinforcing steel plate is sufficient, the bottom plate itself functions as the spacing material even if the spacing material is omitted, and the bottom plate reinforces earth and sand. It can be eliminated to the opposite side (back side) of the steel plate. In addition, as shown in the figure, the bottom plate can be increased in the function of removing soil and the like by tilting the tip portion downward toward the housing side. Moreover, although the example of FIG. 1 is a tip closing type, when it is not necessary to be a tip closing type, the bottom plates 20 and 21 may not be provided, and the spacing member 40 itself functions as a bottom plate. Obstacles, earth and sand, etc. can be removed to the opposite side (rear side) of the reinforcing steel plate by the spacing material, and in this case, the press-fit resistance can be further reduced.

図2は先端非閉塞型として鋼板下端部に底板を形成した例を説明する図である。
この例では、端部に継手を有する補強鋼板10の下端部に補強鋼板の躯体と反対側(背面側)から躯体側に向かって延びるように斜め底板22を接合し(図2(a))、或いは、端部に継手を有する補強鋼板10の下端部を曲げ加工したり、下端部斜めに板を接合して躯体側に向けて底板23を形成し(図2(b))、1つ以上の間隔材41、42を底板22、23の先端より躯体側に突出するように鋼板下端部と底板とに接合している。このような補強鋼板10を橋脚躯体1に沿って圧入していくと、底板には矢印A方向に土圧がかかって間隔材41、42は躯体壁面に押しつけられるが、間隔材41、42は躯体から矢印Bに示す反力を受けて土圧に対抗し、補強鋼板が躯体側に寄ってしまうことはない。なお、図2(a)の斜め底板22は、鋼板の躯体と反対側では鋼板側へ向かう土圧を受けるが、鋼板の躯体側で受ける土圧によりバランスして回転モーメントは作用せず、斜め底板22の補強鋼板の躯体と反対側(背面側)部分は、背面側の支障物の排除に寄与して補強鋼板の圧入を容易にできる。
FIG. 2 is a view for explaining an example in which a bottom plate is formed at the lower end portion of the steel plate as a tip non-blocking type.
In this example, the diagonal bottom plate 22 is joined to the lower end portion of the reinforcing steel plate 10 having a joint at the end so as to extend from the opposite side (back side) of the reinforcing steel plate toward the housing side (FIG. 2 (a)). Alternatively, the bottom end of the reinforcing steel plate 10 having a joint at the end is bent, or the bottom plate 23 is formed obliquely by joining the plates obliquely to the bottom (FIG. 2 (b)). The spacing members 41 and 42 are joined to the lower end of the steel plate and the bottom plate so as to protrude from the tips of the bottom plates 22 and 23 toward the housing. When such a reinforcing steel plate 10 is press-fitted along the pier housing 1, earth pressure is applied to the bottom plate in the direction of arrow A, and the spacing members 41 and 42 are pressed against the housing wall surface. By receiving the reaction force indicated by the arrow B from the housing, it resists the earth pressure and the reinforced steel plate does not approach the housing side. 2 (a) is subjected to earth pressure toward the steel plate on the side opposite to the steel plate housing, but is not balanced by the earth pressure received on the steel plate housing side, and the rotational moment does not act. The portion of the bottom plate 22 opposite to the casing of the reinforcing steel plate (back side) contributes to the elimination of obstacles on the back side, and can easily press-fit the reinforcing steel plate.

間隔材41、42としては、図1の場合と同様に、施工に必要な間隔を保持できる厚みを持たせるようにする。こうして間隔材41、42を躯体面に当接させながら補強鋼板10を圧入していくと、支障物6があっても底板22、23により土中へ移動させる力が作用して排除できるため、補強鋼板設置精度を確保することができる。また底板は先端が躯体壁面と離れているため補強鋼板と躯体との隙間に土砂等が流入するが、土砂等の礫径が小さいため掘削作業は容易である。なお、間隔材を複数設置することで底板の強度保持を図ることができるとともに、流入する土砂等の礫径を一層小さくすることができる。こうして端部に継手を有する補強鋼板10の継手と隣接鋼板の継手とをつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の土砂等を除去した後、コンクリート等を充填することで補強工事は完了する。このように底板を先端非閉塞型とすることで、土圧を軽減(建て込み時の抵抗軽減)効果が得られる。   As the spacing members 41 and 42, as in the case of FIG. 1, the spacing members 41 and 42 have a thickness that can maintain the spacing required for construction. Thus, when the reinforcing steel plate 10 is press-fitted while the spacing members 41 and 42 are brought into contact with the housing surface, even if there is an obstacle 6, the force to move into the soil by the bottom plates 22 and 23 can be eliminated. Reinforced steel plate installation accuracy can be ensured. Moreover, since the tip of the bottom plate is separated from the wall surface of the frame, earth and sand flow into the gap between the reinforcing steel plate and the frame, but excavation work is easy because the diameter of gravel such as earth and sand is small. In addition, it is possible to maintain the strength of the bottom plate by installing a plurality of spacing members, and it is possible to further reduce the diameter of gravel such as earth and sand flowing in. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed. By making the bottom plate non-blocking in this way, the effect of reducing earth pressure (reducing resistance during installation) can be obtained.

なお、上記説明では補強鋼板下端部に間隔材を設けるようにしたが、この例においても補強鋼板の強度が十分あれば間隔材を省略してもよく、底板により土砂等を補強鋼板の躯体と反対側(背面側)へ排除することができる。また、底板22、23を設けないようにしてもよく、間隔材41、42自体が底板の機能を果たし、間隔材により支障物や土砂等を補強鋼板の躯体と反対側(背面側)へ排除することができ、その場合には、一層圧入抵抗を減らすことができる。   In the above description, the spacing material is provided at the lower end of the reinforcing steel plate. However, in this example as well, the spacing material may be omitted if the strength of the reinforcing steel plate is sufficient. It can be eliminated to the opposite side (back side). Further, the bottom plates 22 and 23 may not be provided, and the spacing members 41 and 42 themselves function as a bottom plate, and obstacles and earth and sand are excluded to the opposite side (rear side) of the reinforcing steel plate by the spacing members. In this case, the press-fit resistance can be further reduced.

図3は先端閉塞型として補強鋼板下端部に底板を形成し、補強鋼板継手側の側部に噴出ノズルを設けた例を説明する図であり、図3(a)は断面図、図3(b)、図3(c)は正面側斜視図である。この例は、図1(a)で示した構成の補強鋼板継手側の側部に高圧水(または高圧空気)を噴出するようにしたものである。
図3(a)において、橋脚躯体1を補強する鋼板10の下端部を曲げ加工したり、下端部斜めに板を接合して躯体側に向けて形成した底板20の先端を橋脚躯体1の壁面に当接(先端閉塞型)させ、補強鋼板10の下端部と底板20には、橋脚躯体との間隔を保持するために、1つ以上の間隔材40が接合により取付けられ、前述したように、間隔材40と底板20の先端とを躯体面に当接させながら補強鋼板10を圧入していくと、支障物6があっても底板20により補強鋼板の躯体と反対側(背面側)へ排除できる。さらに、噴出ノズル15より高圧水または高圧空気を噴出して土砂等を流動化して排除することで、圧入を容易に行うことができる。こうして端部に継手を有する補強鋼板10の継手と隣接鋼板の継手とをつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の土砂等を除去した後、コンクリート等を充填することで補強工事は完了する。
FIG. 3 is a view for explaining an example in which a bottom plate is formed at the lower end portion of the reinforcing steel plate as a tip closing type, and an ejection nozzle is provided on the side portion on the reinforcing steel plate joint side. FIG. b) and FIG.3 (c) are front side perspective views. In this example, high-pressure water (or high-pressure air) is ejected to the side portion on the reinforcing steel plate joint side having the configuration shown in FIG.
In FIG. 3A, the lower end of the steel plate 10 that reinforces the pier housing 1 is bent, or the bottom plate 20 formed by joining the plates obliquely at the lower end and facing the housing side is used as the wall surface of the pier housing 1. One or more spacing members 40 are attached to the lower end portion of the reinforcing steel plate 10 and the bottom plate 20 by bonding in order to maintain the spacing between the pier frame and as described above. When the reinforcing steel plate 10 is press-fitted while the spacing member 40 and the tip of the bottom plate 20 are in contact with the housing surface, even if there is an obstacle 6, the bottom plate 20 moves to the opposite side (back side) of the reinforcing steel plate. Can be eliminated. Furthermore, press-fitting can be easily performed by jetting high-pressure water or high-pressure air from the jet nozzle 15 to fluidize and remove earth and sand. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed.

なお、噴出ノズルは継手部、鋼矢板内のいずれでもよく、図3(b)に示すように、噴出ノズル15は補強鋼板10の脇に噴出ノズル用配管15を設置することで圧入抵抗を低減するようにしてもよく、また、図3(c)に示すように、鋼板端部の継手11内に噴出ノズル用の配管を設置することで、圧入抵抗を低減するようにしてもよい。また、上記の例では、図1(a)に示した先端閉塞型の場合に噴出ノズルを設置するようにしたが、図2に示した先端非閉塞型の場合に設置するようにしてもよいことは言うまでもない。   The jet nozzle may be either a joint part or a steel sheet pile. As shown in FIG. 3B, the jet nozzle 15 is provided with a jet nozzle pipe 15 on the side of the reinforcing steel plate 10 to reduce the press-fitting resistance. Alternatively, as shown in FIG. 3C, the injection resistance may be reduced by installing a pipe for the ejection nozzle in the joint 11 at the end of the steel plate. Further, in the above example, the ejection nozzle is installed in the case of the tip closed type shown in FIG. 1A, but may be installed in the case of the tip non-closed type shown in FIG. Needless to say.

図4は鋼板下端部を斜めにカット(片切り)し、間隔材と底板を形成した例を説明する図であり、図4(a)は断面図、図4(b)は正面図である。
この例では、端部に継手を有する補強鋼板10の先端を斜めにカット(片切り)し、カットした下辺に沿って底板24を接合するとともに、底板の両端に補強鋼板継手側の側辺に沿って間隔材43、44を接合する。このような補強鋼板を圧入して底板24が支障物6に当たると、底板24が斜めのため支障物は躯体面に沿った横方向に移動(図4(b))させられて排除され、その結果、補強鋼板の設置精度を確保することができる。なお、底板24と間隔材43、44の補強鋼板10からの突出高さを同じにして先端閉塞型とすれば、補強鋼板と躯体との隙間の土砂等もほぼ排除できるため土砂等の掘削作業を簡素化できるが、先端閉塞型でなくてもよい。こうして端部に継手を有する補強鋼板10の継手と隣接鋼板の継手とをつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の土砂等を除去した後、コンクリート等を充填することで補強工事は完了する。なお、補強鋼板10の先端を斜めにカット(片切り)することで、圧入抵抗を低減して鋼板圧入時の推進性を向上させることができる。もちろん、斜めにカットした先端に底板等を設けないようにしてもよく、その場合には一層圧入抵抗を減らすことができ、また、間隔材を省略して底板24のみとしてもよく、その場合にも補強鋼板圧入により十分に土砂等の排除を行うことが可能である。
FIG. 4 is a view for explaining an example in which the lower end portion of the steel plate is cut obliquely (one-sided) to form a spacing member and a bottom plate, FIG. 4 (a) is a sectional view, and FIG. 4 (b) is a front view. .
In this example, the front end of the reinforcing steel plate 10 having a joint at the end is cut obliquely (one-sided), and the bottom plate 24 is joined along the cut lower side, and the both sides of the bottom plate are connected to the side on the reinforcing steel plate joint side. The spacing members 43 and 44 are joined along. When such a reinforcing steel plate is press-fitted and the bottom plate 24 hits the obstacle 6, the bottom plate 24 is slanted so that the obstacle is moved laterally along the housing surface (FIG. 4 (b)) and removed. As a result, the installation accuracy of the reinforced steel plate can be ensured. If the bottom plate 24 and the spacing members 43, 44 have the same protruding height from the reinforcing steel plate 10 and are of a closed end type, the earth and sand in the gap between the reinforcing steel plate and the frame can be almost eliminated, so excavation work of earth and sand etc. However, it may not be a tip closing type. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed. Note that, by cutting (cutting) the front end of the reinforcing steel plate 10 obliquely, it is possible to reduce the press-fitting resistance and improve the propulsion property during the press-fitting of the steel plate. Of course, the bottom plate or the like may not be provided at the tip which is cut obliquely, in which case the press-fit resistance can be further reduced, and the spacing member may be omitted and only the bottom plate 24 may be omitted. In addition, it is possible to sufficiently remove earth and sand by press-fitting a reinforced steel plate.

図5は鋼板下端部を斜めにカット(片切り)した他の例を説明する図で、図5(a)は正面図、図5(b)は側面図である。
この例では、端部に継手を有する補強鋼板10の下端部を斜めにカット(片切り)し、カットした下辺に沿って底板25を接合するとともに、2つの間隔材45、46を鋼板下端部斜辺に沿って鋼板面に接合する。この例では、間隔材45、46の補強鋼板から躯体側への突出高さを底板の補強鋼板から躯体側への突出高さより高くして先端非閉塞型としているが、間隔材と底板の補強鋼板から躯体側への突出高さを同じにして先端閉塞型としてもよい。もちろん、間隔材は3つ以上設けてもよい。このように、補強鋼板下端を斜めにカットすることで、圧入抵抗を低減して鋼板圧入時の推進性を向上させることができる。また、間隔材を複数とすることで、鋼板圧入時の直進性が向上し、また、補強鋼板の剛性も増すため、高圧での圧入を行うことが可能となる。この補強鋼板を圧入していくと、底板25が斜めのため支障物は横方向に移動させられて排除され、その結果、補強鋼板の設置精度を確保することができる。こうして端部に継手を有する補強鋼板10の継手と隣接鋼板の継手とをつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の土砂等を除去した後、コンクリート等を充填することで補強工事は完了する。
FIG. 5 is a diagram for explaining another example in which the lower end of the steel plate is cut obliquely (one-sided), FIG. 5 (a) is a front view, and FIG. 5 (b) is a side view.
In this example, the lower end of the reinforcing steel plate 10 having a joint at the end is cut obliquely (one-sided), the bottom plate 25 is joined along the cut lower side, and the two spacing members 45 and 46 are connected to the lower end of the steel plate. Join the steel plate along the hypotenuse. In this example, the protruding height of the spacing members 45 and 46 from the reinforcing steel plate to the housing side is set higher than the protruding height of the bottom plate from the reinforcing steel plate to the housing side to make the tip non-blocking type, but the spacing material and the bottom plate are reinforced. The protruding height from the steel plate to the housing side may be the same and the tip closed type may be used. Of course, three or more spacing members may be provided. Thus, by cutting the lower end of the reinforcing steel plate obliquely, the press-fitting resistance can be reduced and the propulsive property during the press-fitting of the steel plate can be improved. Further, by using a plurality of spacing members, the straightness at the time of press-fitting a steel plate is improved, and the rigidity of the reinforced steel plate is increased, so that press-fitting at a high pressure can be performed. When this reinforcing steel plate is press-fitted, the obstruction is moved laterally and eliminated because the bottom plate 25 is inclined, and as a result, the installation accuracy of the reinforcing steel plate can be ensured. In this way, the joint of the reinforcing steel plate 10 having the joint at the end and the joint of the adjacent steel plate are joined and press-fitted, and after removing the earth and sand between the closed reinforcing steel plate and the pier frame, the concrete is filled. Reinforcement work is completed.

この例においても、間隔材45、46を省略して底板25のみとしてもよく、補強鋼板の圧入により底板25で土砂等を躯体面に沿って横方向に排除することができる。また、底板25を省略して間隔材45、46のみとしてもよく、その場合には一層圧入抵抗を減らすことができる。   In this example as well, the spacing members 45 and 46 may be omitted and only the bottom plate 25 may be used, and earth and sand can be removed laterally along the frame surface by the bottom plate 25 by press-fitting the reinforcing steel plate. Further, the bottom plate 25 may be omitted and only the spacing members 45 and 46 may be used. In that case, the press-fitting resistance can be further reduced.

図6は鋼板下端部を斜めにカット(両切り)した例を説明する図で、図6(a)は正面図、図6(b)は側面図である。
この例では、継手を有する補強鋼板10の下端部をその両側部から中心に向けて斜めにカット(両切り)して三角形状とし、その周囲とに沿って間隔材47、48を接合する。なお、図示するように、間隔材47、48は補強鋼板の両側辺に沿って上方へ少し延ばすようにしてもよい。この例では、底板は特に設けないが、間隔材47、48が底板の機能も有することになる。補強鋼板の下端を三角形状とすることで補強鋼板圧入時の推進性を向上させることができ、間隔材を複数とすることで圧入時の直進性が向上し、鋼板の剛性も増すため高圧での補強鋼板圧入が可能となる。また、先端閉塞型となるため補強鋼板圧入後の流入土砂等を軽減することができる。
6A and 6B are diagrams for explaining an example in which the lower end portion of the steel plate is cut obliquely (both sides), FIG. 6A is a front view, and FIG. 6B is a side view.
In this example, the lower end portion of the reinforcing steel plate 10 having a joint is cut obliquely (both sides) from both side portions toward the center to form a triangular shape, and the spacing members 47 and 48 are joined along the periphery thereof. In addition, as shown in the figure, the spacing members 47 and 48 may be slightly extended upward along both sides of the reinforcing steel plate. In this example, the bottom plate is not particularly provided, but the spacing members 47 and 48 also have the function of the bottom plate. By making the lower end of the reinforcing steel plate a triangular shape, the propulsive performance at the time of press-in of the reinforcing steel plate can be improved, and by using a plurality of spacing members, the straightness at the time of press-in is improved and the rigidity of the steel plate is also increased. This makes it possible to press-fit reinforced steel sheets. Moreover, since it becomes a front-end | tip obstruction | occlusion type | mold, the inflow earth and sand after a reinforced steel plate press injection can be reduced.

なお、図4〜図6の各例においても、図3において説明したように、噴出ノズルを補強鋼板の継手部、或いは補強鋼板内等に設けて高圧水または高圧空気を噴出し、土砂等を流動化して排除することで、圧入を容易化するようにしてもよい。   4 to 6, as described in FIG. 3, the ejection nozzle is provided in the joint portion of the reinforcing steel plate or the inside of the reinforcing steel plate to eject high-pressure water or high-pressure air to remove earth and sand. The press-fitting may be facilitated by fluidizing and eliminating.

次に、鋼板圧入時の支障物を排除する底板、間隔材の鋼板形状の例について図7〜図10により説明する。   Next, an example of the shape of the bottom plate and the spacing member steel plate that eliminates obstacles during the press-fitting of the steel plate will be described with reference to FIGS.

図7は底板、間隔材の基本形状を説明する図で、図7(a)は斜視図、図7(b)は側面図である。
端部に継手11を有する補強鋼板10の下端部には躯体側に向けて、先端を下方へ傾斜させた斜底板30を形成し、補強鋼板10と斜底板30とに跨がってプレート状の間隔材50を接合する。斜底板30と間隔材50の補強鋼板からの突出高さは同じでも異なっていてもよい。ここでは間隔材50を1枚としているが複数であってもよい。また、底板30を省略して間隔材50のみとしてもよく、この場合は、一層圧入抵抗を低減することができる。さらに、底板を省略して間隔材を複数としてもよく、この場合は、間隔材同士の間隔を狭くすれば躯体と補強鋼板との間に残留する支障物の粒径を小さくすることが可能であり、その後の掘削作業の低減となり、かつ、間隔材のピッチ間隔より大きい支障物は補強鋼板圧入時に間隔材の下端部で排除することが可能で、残留する土砂等の粒径を制御することができる。もちろん、前述の通り、補強鋼板、底板の強度が十分あれば、間隔材50を省略してもよい。
7A and 7B are diagrams for explaining the basic shapes of the bottom plate and the spacing member, in which FIG. 7A is a perspective view and FIG. 7B is a side view.
At the lower end of the reinforcing steel plate 10 having the joint 11 at the end, a slant bottom plate 30 is formed with the tip inclined downward toward the housing side, and the plate shape extends across the reinforcing steel plate 10 and the slant bottom plate 30. The spacing member 50 is joined. The protruding height of the inclined bottom plate 30 and the spacing member 50 from the reinforcing steel plate may be the same or different. Here, the number of spacing members 50 is one, but a plurality of spacing members may be used. Further, the bottom plate 30 may be omitted and only the spacing member 50 may be used. In this case, the press-fit resistance can be further reduced. Furthermore, the bottom plate may be omitted, and a plurality of spacing members may be provided.In this case, if the spacing between the spacing members is narrowed, the particle size of the obstacle remaining between the housing and the reinforcing steel plate can be reduced. There is a reduction in the excavation work after that, and obstacles larger than the pitch interval of the spacing material can be eliminated at the lower end of the spacing material during press-fitting of the reinforcing steel plate, and the particle size of the remaining earth and sand is controlled. Can do. Of course, as described above, the spacing member 50 may be omitted if the strength of the reinforcing steel plate and the bottom plate is sufficient.

図8は底板の断面形状の例を説明する図である。
図8(a)は補強鋼板下端部との接続部が曲線状で、先端部が直線形状の場合、図8(b)は補強鋼板下端部との接続部が直線状で、先端を上側に折り曲げた形状の場合、図8(c)は補強鋼板下端部との接続部が曲線形状で、先端部を曲線状に上側へ折り曲げた形状である。底板は支障物の排除と補強鋼板圧入後の流入土砂等を軽減する機能を有しており、圧入抵抗が小さい方が望ましく、これらのことを勘案して上記各種形状を選択する。
FIG. 8 is a diagram for explaining an example of the cross-sectional shape of the bottom plate.
FIG. 8A shows a case where the connecting portion with the lower end of the reinforcing steel plate is curved and the tip is linear, and FIG. 8B shows that the connecting portion with the lower end of the reinforcing steel plate is linear and the tip is on the upper side. In the case of the bent shape, FIG. 8C shows a shape in which the connecting portion with the lower end of the reinforcing steel plate is a curved shape and the tip is bent upward in a curved shape. The bottom plate has a function of eliminating obstacles and reducing inflow earth and sand after the press-fitting of the reinforcing steel plate, and it is desirable that the press-fitting resistance is small. The above-mentioned various shapes are selected in consideration of these factors.

図9は正面側から見た底板の各種形状の例を示す図である。
図9(a)は平面状で矩形の場合、図9(b)は平面状で三角形または台形の場合であるが、さらにこれらの角を曲線状に加工してもよい。また、鋼板圧入性をよくするため、図9(c)に示すように、先端を尖らせて三角錐等の立体錐形状としてもよい。この場合も、先端を曲面状としてもよい。
FIG. 9 is a diagram showing examples of various shapes of the bottom plate viewed from the front side.
FIG. 9A shows the case of a flat and rectangular shape, and FIG. 9B shows the case of a flat and triangular or trapezoidal shape, but these corners may be further processed into a curved shape. Moreover, in order to improve steel plate press-fit property, as shown in FIG.9 (c), it is good also as a solid pyramid shape, such as a triangular pyramid, by sharpening a front-end | tip. Also in this case, the tip may be curved.

図10は間隔材の各種形状の例を示す図である。
ここでは、直線状の斜め底板の場合について例示するが、図8に示した各種形状の底板であってもよい。
図10(a)〜図10(d)は間隔材と底板の補強鋼板からの突出高さを同じにした先端閉塞型の場合であり、図10(a)は間隔材を補強鋼板に接合、図10(b)は間隔材を補強鋼板と底板に跨がって接合、図10(c)は間隔材を底板に接合、図10(d)は1つの間隔材を補強鋼板に接合、他の間隔材を底板に接合した例である。また、図10(e)は間隔材の鋼板からの突出高さを底板の鋼板からの突出高さより大きくした先端非閉塞型の場合であり、鋼板と底板に跨がって接合した例である。勿論、先端非閉塞型の場合でも間隔材を鋼板に接合、間隔材を底板に接合、1つの間隔材を鋼板に接合、他の間隔材を底板に接合するようにしてもよい。
FIG. 10 is a diagram illustrating examples of various shapes of the spacing member.
Here, the case of a linear oblique bottom plate is illustrated, but the bottom plate of various shapes shown in FIG. 8 may be used.
10 (a) to 10 (d) show a case of a closed end type in which the protruding height of the spacing member and the bottom plate from the reinforcing steel plate is the same, and FIG. 10 (a) shows the joining of the spacing member to the reinforcing steel plate. Fig. 10 (b) shows the joining of the spacing material across the reinforcing steel plate and the bottom plate, Fig. 10 (c) shows the joining of the spacing material to the bottom plate, Fig. 10 (d) shows the joining of one spacing material to the reinforcing steel plate, etc. This is an example in which the spacing material is joined to the bottom plate. FIG. 10 (e) shows a case of a tip non-blocking type in which the protruding height of the spacing member from the steel plate is larger than the protruding height of the bottom plate from the steel plate, and is an example of joining across the steel plate and the bottom plate. . Of course, even in the case of the tip non-blocking type, the spacing material may be joined to the steel plate, the spacing material may be joined to the bottom plate, one spacing material may be joined to the steel plate, and the other spacing material may be joined to the bottom plate.

底板、間隔材の基本形状は図7に示した通りであるが、補強鋼板の設置精度の確保、掘削の容易・簡素化を図るようにした底板、間隔材の例について図11〜図13により説明する。
図11は主に補強鋼板の設置精度を確保するようにした例を説明する図である。
図11(a)は、間隔材を複数設けた例であり、ここでは2つの間隔材51、52を補強鋼板10と底板30に接合しており、間隔材を複数とすることで底板先端の剛性が増し、2つの間隔材により躯体と複数箇所で接することでこれが補強鋼板圧入時のガイドとなり、圧入の直進性が増し、補強鋼板の設置精度を確保することができる。
図11(b)は間隔材を複数にするとともに、底板に切り込みを入れた例である。ここでは2つの間隔材51、52を補強鋼板と底板に接合し、間隔材51、52との間で切り込みを入れた底板31を使用している。底板に切り込みを入れたことで、圧入抵抗を低減して鋼板の設置精度を確保することができる。
The basic shapes of the bottom plate and the spacing member are as shown in FIG. 7, but examples of the bottom plate and the spacing member designed to ensure the installation accuracy of the reinforcing steel plate and facilitate and simplify the excavation are shown in FIGS. explain.
FIG. 11 is a diagram for explaining an example in which the installation accuracy of the reinforcing steel plate is mainly ensured.
FIG. 11A shows an example in which a plurality of spacing members are provided. Here, two spacing members 51 and 52 are joined to the reinforcing steel plate 10 and the bottom plate 30, and a plurality of spacing members are used to form the tip of the bottom plate. Rigidity increases, and it contacts with a housing | casing with two space | intervals at two or more places, this becomes a guide at the time of press-fitting a reinforcing steel plate, the straightness of press-fitting increases, and the installation accuracy of the reinforcing steel plate can be secured.
FIG. 11B shows an example in which a plurality of spacing members are provided and a bottom plate is cut. Here, two spacing members 51 and 52 are joined to a reinforcing steel plate and a bottom plate, and a bottom plate 31 is used which is cut between the spacing members 51 and 52. By making the cut in the bottom plate, it is possible to reduce the press-fitting resistance and secure the installation accuracy of the steel plate.

図12は底板や間隔材として形鋼を使用し、主に設置精度を確保するようにした例を示す図である。
図12(a)は2個1組としたそれぞれの等辺山形鋼の立ち上がり面を近接対向させて鋼板下端部に接合した例、図12(b)は2個1組としたそれぞれの等辺山形鋼の底面を近接対向させて鋼板下端部に接合した例であり、2個1組とした等辺山形鋼で間隔材と底板の機能を合わせ持たせるようにしている。
図12(c)は溝形鋼を鋼板下端部に接合した例であり、同様に間隔材と底板の機能を合わせ持たせるようにしている。
図12(d)はH形鋼を鋼板と底板に接合した例である。
いずれの場合も、補強鋼板先端の剛性が増して圧入の直進性が増し、補強鋼板の設置精度を確保するとともに、高圧での圧入が可能となる。
FIG. 12 is a diagram showing an example in which shape steel is used as a bottom plate and a spacing member, and installation accuracy is mainly secured.
FIG. 12 (a) shows an example in which the rising surfaces of each pair of equilateral chevron steels in a pair are brought close to each other and joined to the lower end of the steel plate, and FIG. 12 (b) shows each equilateral chevron steel in a pair. This is an example in which the bottom surfaces of the steel plates are closely opposed to each other and joined to the lower end of the steel plate.
FIG. 12C is an example in which channel steel is joined to the lower end of the steel plate, and the functions of the spacing member and the bottom plate are similarly provided.
FIG. 12D shows an example in which H-shaped steel is joined to a steel plate and a bottom plate.
In either case, the rigidity at the tip of the reinforcing steel plate is increased and the straightness of press-fitting is increased, so that the installation accuracy of the reinforcing steel plate is ensured and press-fitting at a high pressure is possible.

図13は主に躯体と補強鋼板の間の土砂掘削量を軽減する例を示す図である。
図13(a)は底板32の幅を補強鋼板10の幅よりも広くし、間隔材51、52を補強鋼板の継手側両側辺部にそれぞれ接合した例であり、底板が広いため流入土砂等が少なくなり、圧入後の土砂掘削量を減らすことができる。
図13(b)は間隔材51、52を底板33の両側部に配置して底板の両側部を閉塞することで、流入土砂等が少なくなり、圧入後の土砂掘削量を減らすことができる。
図13(c)は底板34の先端を狭めた台形状とし、底板の左右両側辺に沿ってプレート状の間隔材53、54を配置して、底板、間隔材、補強鋼板により閉塞することで、流入土砂が少なくなり補強鋼板圧入後の土砂掘削量を減らすことができる。
FIG. 13 is a diagram mainly showing an example of reducing the amount of earth and sand excavation between the frame and the reinforcing steel plate.
FIG. 13A is an example in which the width of the bottom plate 32 is made wider than the width of the reinforcing steel plate 10 and the spacing members 51 and 52 are respectively joined to both side portions on the joint side of the reinforcing steel plate. The amount of earth excavation after press-fitting can be reduced.
In FIG. 13B, the spacing members 51 and 52 are arranged on both side portions of the bottom plate 33 and the both side portions of the bottom plate are closed, so that inflow soil and the like are reduced, and the amount of sediment excavation after press-fitting can be reduced.
FIG. 13C shows a trapezoidal shape in which the tip of the bottom plate 34 is narrowed, plate-like spacing members 53 and 54 are arranged along the left and right sides of the bottom plate, and are closed by the bottom plate, the spacing material, and the reinforcing steel plate. Inflow soil is reduced, and the amount of soil excavation after press-fitting of reinforcing steel plate can be reduced.

図14は鋼板下端部にダイヤ型部材を形成した例を説明する図で、図14(a)は平面図、図14(b)は斜視図、図14(c)は正面図、図14(d)は側面図である。
この例は鋼板下端部に所定の厚みを有するダイヤ型部材60を、その尖端が上方と下方に向くように接合した例を示している。ダイヤ型部材60は躯体面との間隔を維持する間隔材として機能するとともに、補強鋼板圧入時に、その尖端部で土砂等を排除するので、上記の各例における底板の機能も併せ持っている。さらに、ダイヤ型部材の尖端が下方に向いているため、圧入時の推進性が向上するとともに、ダイヤ型部材の尖端は上方へも向いているため、引き抜きの必要が生じた場合の引き抜きも容易である。かかる構造の補強鋼板10の継手と隣接鋼板の継手とをつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の土砂等を除去した後、コンクリート等を充填することで補強工事は完了する。
FIG. 14 is a diagram for explaining an example in which a diamond-shaped member is formed at the lower end of the steel plate. FIG. 14 (a) is a plan view, FIG. 14 (b) is a perspective view, FIG. 14 (c) is a front view, and FIG. d) is a side view.
This example shows an example in which a diamond-shaped member 60 having a predetermined thickness is joined to a lower end portion of a steel plate so that the tip thereof is directed upward and downward. The diamond-shaped member 60 functions as a spacing member that maintains the spacing with the casing surface, and also removes earth and sand at the tip of the reinforcing steel plate when it is press-fitted, so that it also has the function of the bottom plate in each of the above examples. Furthermore, since the point of the diamond-shaped member is directed downward, the propulsive property during press-fit is improved, and the point of the diamond-shaped member is also directed upward, so that it is easy to pull out when it is necessary to pull out. It is. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 and the joint of the adjacent steel plate with such a structure, press-fitting, removing earth and sand between the closed reinforcing steel plate and the pier frame, and then filling with concrete etc. To do.

図15は鋼板下端部にダイヤ型部材を形成した他の例を示す図で、図15(a)は平面図、図15(b)は斜視図、図15(c)は正面図、図15(d)は側面図である。
この例は図14の例に対して、ダイヤ型部材の躯体に面した中央部を隆起させたダイヤ型部材61を、その尖端が上方と下方に向くように接合して鋼板下端部に取付け、ダイヤ型部材61と躯体との接触面積を小さくすることで圧入抵抗を小さくするようにした点以外は、図14の場合と同様である。
15 is a view showing another example in which a diamond-shaped member is formed at the lower end of the steel plate, FIG. 15 (a) is a plan view, FIG. 15 (b) is a perspective view, FIG. 15 (c) is a front view, FIG. (D) is a side view.
In this example, with respect to the example of FIG. 14, the diamond-shaped member 61 with the center portion facing the housing of the diamond-shaped member raised is joined so that the pointed ends are directed upward and downward, and attached to the lower end of the steel plate, 14 is the same as the case of FIG. 14 except that the press-fit resistance is reduced by reducing the contact area between the diamond-shaped member 61 and the housing.

図16は間隔材と噴出ノズルとを組み合わせた例を説明する図で、図16(a)は平面図、図16(b)は斜視図、図16(c)は正面図、図16(d)は側面図である。
この例は、端部に継手を有する補強鋼板の下端部に、2枚の板状間隔材70を取り付け、板状間隔材の下辺を躯体側へ向けて先端を下方へ傾斜させ、先端部を鋭角にして尖らせるようにしている。さらに、この板状間隔材70が互いに対向する内面側には、下方かつ躯体と反対側へ向けて高圧水または高圧空気を噴出する2つの斜めノズル71が設けられている。斜めノズル71を設ける位置は板状間隔材の内面側以外でもよく、設置数も任意である。このように、板状間隔材の下辺を先端に向かって下方へ傾斜させてその先端を尖らせることで支障物等を躯体と反対側へ排除し、さらに斜めノズル71で下方かつ躯体と反対側へ向けて高圧水または高圧空気を噴出することで、躯体と反対側への支障物等の排除が一層促進されることになる。なお、補強鋼板下端部には底板がないため圧入抵抗が少なく、かつ引き抜きの必要が生じた場合の引き抜きも容易である。かかる構造の補強鋼板10の継手を隣接鋼板の継手とつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の支障物等を除去した後、コンクリート等を充填することで補強工事は完了する。
16A and 16B are diagrams for explaining an example in which a spacing member and an ejection nozzle are combined. FIG. 16A is a plan view, FIG. 16B is a perspective view, FIG. 16C is a front view, and FIG. ) Is a side view.
In this example, two plate-like spacing members 70 are attached to the lower end of a reinforcing steel plate having a joint at the end, the tip is inclined downward with the lower side of the plate-like spacing material facing the housing, and the tip is It is sharpened at an acute angle. Further, two oblique nozzles 71 are provided on the inner surfaces of the plate-like interval member 70 facing each other, and jet high pressure water or high pressure air downward and to the opposite side of the housing. The position where the oblique nozzle 71 is provided may be other than the inner surface side of the plate-like interval member, and the number of installation is arbitrary. In this way, by obstructing the lower side of the plate-shaped interval member downward toward the tip and sharpening the tip, obstructions and the like are removed to the opposite side of the housing, and further, the slant nozzle 71 is lowered and opposite to the housing. By ejecting high-pressure water or high-pressure air toward the side, the removal of obstacles and the like on the side opposite to the housing is further promoted. In addition, since there is no bottom plate at the lower end portion of the reinforcing steel plate, the press-fitting resistance is small, and the drawing when the drawing needs to be performed is easy. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

図17は間隔材と噴出ノズルとを組み合わせた他の例を説明する図で、図17(a)は平面図、図17(b)は斜視図、図17(c)は正面図、図17(d)は側面図である。この例は継手を有する補強鋼板の下端部で、躯体と対向する面に、図16の場合と同様の2枚の板状間隔材70を取り付け、板状間隔材の下辺を躯体に向けて先端を下方へ傾斜させて先端部に角度を付けて尖らせるようにし、さらに、補強鋼板の躯体と反対側の面(背面)下端部に、中央部を隆起させたプレート75を取り付け、プレートの面に沿って上方から下方に向かって高圧水または高圧空気を噴出するノズル76を設けたものである。プレート75は上方から角度を付けて隆起させた後、鋼板下方へ向かっており、この面に沿って噴出された高圧水または高圧空気は、角度を付けたプレート面により、揚力効果が働いて支障物等の排除に効果的に作用する。上記したように、板状間隔材70は、その下辺を先端に向かって下方へ傾斜させてその先端を尖らせることで支障物等を躯体と反対側へ排除する。そして、躯体と反対側には、中央部を隆起させたプレート75の面に沿って高圧水または高圧空気が下方へ噴出されるので、躯体と反対側への支障物等の排除が一層促進されることになる。また、板状間隔材70の内面側に図16の例の場合と同様に、斜めノズルを配置してさらに支障物等の排除を効果的に行えるようにしてもよい。なお、鋼板下端部には底板がないため圧入抵抗が少なく、かつ引き抜きの必要が生じた場合の引き抜きも容易である。かかる構造の補強鋼板10の継手を隣接鋼板の継手とつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の支障物等を除去した後、コンクリート等を充填することで補強工事は完了する。   17A and 17B are diagrams for explaining another example in which a spacing member and a jet nozzle are combined. FIG. 17A is a plan view, FIG. 17B is a perspective view, FIG. 17C is a front view, and FIG. (D) is a side view. This example is a lower end portion of a reinforcing steel plate having a joint, and two plate-like interval members 70 similar to those in FIG. 16 are attached to the surface facing the case, and the lower end of the plate-like interval member is directed to the case. The plate 75 with a raised central part is attached to the lower end of the surface (rear surface) opposite to the frame of the reinforcing steel plate, and the surface of the plate is inclined. A nozzle 76 that ejects high-pressure water or high-pressure air from above to below is provided. The plate 75 is raised at an angle from above and then heads downward from the steel plate. The high-pressure water or high-pressure air ejected along this surface interferes with the lift effect due to the angled plate surface. It works effectively on the exclusion of things. As described above, the plate-like spacing member 70 has its lower side inclined downward toward the tip and sharpens the tip, thereby removing obstacles and the like on the side opposite to the casing. And on the opposite side to the housing, high-pressure water or high-pressure air is jetted downward along the surface of the plate 75 with the central portion raised, so that the removal of obstacles and the like to the opposite side of the housing is further promoted. Will be. Further, as in the case of the example of FIG. 16, an oblique nozzle may be arranged on the inner surface side of the plate-like interval member 70 so that obstacles and the like can be effectively removed. In addition, since there is no bottom plate at the lower end of the steel plate, the press-fitting resistance is small, and the drawing is easy when the drawing needs to be performed. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

図18は補強鋼板の両面に板状部材を設けた例を説明する図で、図18(a)は平面図、図18(b)は斜視図、図18(c)は正面図、図18(d)は側面図である。
この例は、端部に継手を有する補強鋼板の両面下端部に、先端をカット(片切り)して補強鋼板下端部から上方へ傾斜した下辺を有する板状部材80、81をそれぞれ取り付け、躯体側の面に取り付けた板状部材80を間隔材として機能させる。補強鋼板の圧入により、板状部材80の傾斜辺で躯体側の支障物を排除し、板状部材81の傾斜辺で躯体と反対側(背面側)の支障物等を排除する。また、板状部材81は補強鋼板圧入時の剛性補強として機能する。また、板状部材は各面複数設けるようにしてもよく、板状部材のピッチ間隔を適宜設定することにより、図7の場合に説明したと同様に、残留する土砂等の粒径を制御することができる。そして、補強鋼板下端部には底板がないため圧入抵抗が少なく、かつ引き抜きの必要が生じた場合の引き抜きも容易である。なお、上記説明では補強鋼板下端部を片切りするようにしたが、両側部から中心に向けて斜めにカット(両切り)して三角形状としてもよく、また、カットせずに平坦でもよいことは言うまでもない。かかる構造の補強鋼板10の継手を隣接鋼板の継手とつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の支障物等を除去した後、コンクリート等を充填することで補強工事は完了する。
18A and 18B are diagrams for explaining an example in which plate-like members are provided on both surfaces of a reinforcing steel plate. FIG. 18A is a plan view, FIG. 18B is a perspective view, FIG. 18C is a front view, and FIG. (D) is a side view.
In this example, plate-like members 80 and 81 having lower sides inclined upward from the lower end of the reinforcing steel plate by attaching (cutting) the tip to the lower ends of both sides of the reinforcing steel plate having a joint at the end are respectively attached to the casing. The plate-like member 80 attached to the side surface is caused to function as a spacing member. By press-fitting the reinforcing steel plate, obstacles on the housing side are eliminated at the inclined side of the plate-like member 80, and obstacles on the opposite side (back side) from the housing are eliminated at the inclined side of the plate-like member 81. Further, the plate-like member 81 functions as rigidity reinforcement at the time of press-fitting a reinforced steel plate. Further, a plurality of plate-like members may be provided on each surface, and by setting the pitch interval of the plate-like members as appropriate, the particle size of the remaining earth and sand is controlled as described in the case of FIG. be able to. And since there is no bottom plate in the lower end part of a reinforced steel plate, there is little press-fitting resistance and it is also easy to pull out when it is necessary to pull out. In the above description, the lower end portion of the reinforcing steel plate is cut off. However, it may be cut diagonally (both sides) from both sides toward the center to form a triangular shape, or it may be flat without being cut. Needless to say. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

図19は鋼板下端部に複数の板状間隔材を設けた例を説明する図である。
この例では、端部に継手を有する補強鋼板10の下端部に、複数の板状間隔材を取り付け、板状間隔材の下辺を先端に向かって下方へ傾斜させて先端部に角度を付けて尖らせたもである。
図19(a)は板状間隔材85を矩形プレートとして、その先端を尖らせたものであり、図19(b)は板状間隔材90の躯体側の先端部を曲線状とし、下辺と交わる先端を尖らせたものである。いずれの場合にも、先端部の傾斜した辺で支障物等を躯体と反対側へ排除する。この例でも、鋼板下端部には底板がないため圧入抵抗が少なく、かつ引き抜きの必要が生じた場合の引き抜きも容易である。かかる構造の補強鋼板10の継手を隣接鋼板の継手とつなぎ合わせて圧入し、閉合した補強鋼板と橋脚躯体との間の支障物等を除去した後、コンクリート等を充填することで補強工事は完了する。
FIG. 19 is a diagram illustrating an example in which a plurality of plate-like interval members are provided at the lower end of the steel plate.
In this example, a plurality of plate-like interval members are attached to the lower end portion of the reinforcing steel plate 10 having a joint at the end portion, and the lower end of the plate-like interval member is inclined downward toward the tip end so that the tip end portion is angled. It is also sharp.
FIG. 19A shows the plate-like spacing member 85 as a rectangular plate, with its tip sharpened, and FIG. 19B shows the tip of the plate-like spacing member 90 on the housing side as a curved line. The crossing tip is pointed. In either case, obstructions and the like are removed to the opposite side of the housing at the inclined side of the tip. Also in this example, since there is no bottom plate at the lower end of the steel plate, the press-fitting resistance is small, and the drawing when it is necessary to pull out is easy. Reinforcement work is completed by filling the joint of the reinforcing steel plate 10 with such a structure with the joint of the adjacent steel plate, press-fitting, removing obstacles between the closed reinforcing steel plate and the pier frame, and filling with concrete etc. To do.

なお、図14、図15、図18、図19の各例の場合においても、噴出ノズルを補強鋼板の継手部、或いは補強鋼板内等に設けて高圧水または高圧空気を噴出し、土砂等を流動化して排除することで、圧入を容易にするようにしてもよい。   14, 15, 18, and 19, the ejection nozzle is provided in the joint portion of the reinforcing steel plate or in the reinforcing steel plate to eject high-pressure water or high-pressure air to remove earth and sand. The press-fitting may be facilitated by fluidizing and eliminating.

先端閉塞型として鋼板下端部に底板を形成した例を説明する図である。It is a figure explaining the example which formed the baseplate in the steel plate lower end part as a front-end | tip obstruction type. 先端非閉塞型として鋼板下端部に底板を形成した例を説明する図である。It is a figure explaining the example which formed the baseplate in the steel plate lower end part as a tip non-occlusion type. 先端閉塞型として鋼板下端部に底板を形成し、鋼板継手側側部に噴射ノズルを設けた例を説明する図である。It is a figure explaining the example which formed the bottom plate in the steel plate lower end part as a front end obstruction type, and provided the injection nozzle in the steel plate joint side part. 鋼板下端部を斜めにカットし、間隔材と底板を形成した例の説明図である。It is explanatory drawing of the example which cut the lower end part of the steel plate diagonally and formed the space | interval material and the baseplate. 鋼板下端部を斜めに片切りした例を説明する示す図である。It is a figure explaining the example which cut off the lower end part of the steel plate diagonally. 鋼板下端部を斜めに両切りした例を説明する図である。It is a figure explaining the example which cut both ends of the steel plate diagonally. 底板、間隔材の基本形状を説明する図である。It is a figure explaining the baseplate and the basic shape of a space | interval material. 底板の断面形状の例を説明する図である。It is a figure explaining the example of the cross-sectional shape of a baseplate. 底板の正面各種形状の例を示す示す図である。It is a figure which shows the example of various front shapes of a baseplate. 間隔材の各種形状の例を示す図である。It is a figure which shows the example of the various shapes of a space | interval material. 鋼板設置精度を確保するようにした底板、間隔材の例を示す図である。It is a figure which shows the example of the baseplate and the space | interval material which ensured the steel plate installation precision. 底板や間隔材として形鋼を使用した例を示す図である。It is a figure which shows the example which uses a shape steel as a baseplate or a space | interval material. 躯体と鋼板の間の土砂掘削を軽減する例を示す図である。It is a figure which shows the example which reduces the earth and sand excavation between a frame and a steel plate. 鋼板下端部にダイヤ型部材を形成した例を説明する図である。It is a figure explaining the example which formed the diamond-shaped member in the steel plate lower end part. 鋼板下端部にダイヤ型部材を形成した他の例を説明する図である。It is a figure explaining the other example which formed the diamond-shaped member in the steel plate lower end part. 間隔材と噴出ノズルとを組み合わせた例を説明する示す図である。It is a figure explaining the example which combined the space | interval material and the ejection nozzle. 間隔材と噴出ノズルとを組み合わせた他の例を説明する示す図である。It is a figure explaining the other example which combined the space | interval material and the ejection nozzle. 補強鋼板の両面に板状部材を設けた例を説明する図である。It is a figure explaining the example which provided the plate-shaped member on both surfaces of the reinforcing steel plate. 鋼板下端部に複数の間隔材を設けた例を説明する図である。It is a figure explaining the example which provided the some spacing material in the steel plate lower end part. 従来の補強鋼板圧入工法の全体を説明する図である。It is a figure explaining the whole conventional reinforcement steel plate press-fit method. 従来の補強鋼板圧入工法の細部を説明する図である。It is a figure explaining the detail of the conventional reinforcement steel plate press-fitting method.

符号の説明Explanation of symbols

1…橋脚躯体、2…フーチング、3…地表面、4…補強鋼板、5…地表面、6…支障物、10…補強鋼板、11…継手、15…噴出ノズル、20〜25,30〜34…底板、40〜48,50〜54…間隔材、60,61…ダイヤ型部材、70,85,90…板状間隔材、71,76…ノズル、75…プレート、80,81…板状部材。 DESCRIPTION OF SYMBOLS 1 ... Pier pier frame, 2 ... Footing, 3 ... Ground surface, 4 ... Reinforced steel plate, 5 ... Ground surface, 6 ... Obstacle, 10 ... Reinforced steel plate, 11 ... Joint, 15 ... Jet nozzle, 20-25, 30-34 ... bottom plate, 40 to 48, 50 to 54 ... spacing member, 60, 61 ... diamond-shaped member, 70, 85, 90 ... plate spacing member, 71, 76 ... nozzle, 75 ... plate, 80, 81 ... plate member .

Claims (7)

端部に継手を有する補強鋼板を建て込んで巻き立て、閉合した補強鋼板と柱状構造物躯体との間に充填材を充填する耐震補強方法において、
補強鋼板の下端部に底板を形成するともともに、補強鋼板下端部と底板に跨がって躯体と補強鋼板との間隔を保持する間隔材を形成し、底板先端を躯体に近接または当接させて補強鋼板を地中へ圧入し、躯体と補強鋼板との間の支障物を排除することを特徴とする柱状構造物の耐震補強鋼板設置方法。
In the seismic strengthening method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A bottom plate is formed at the lower end of the reinforcing steel plate, and a spacing member is formed to maintain the distance between the casing and the reinforcing steel plate across the lower end of the reinforcing steel plate and the bottom plate, and the bottom plate tip is brought close to or in contact with the casing. A method of installing a seismic reinforced steel plate for a columnar structure, wherein the reinforced steel plate is pressed into the ground to eliminate obstacles between the frame and the reinforced steel plate.
前記間隔材を複数形成したことを特徴とする請求項1記載の耐震補強鋼板設置方法。The earthquake-resistant reinforced steel plate installation method according to claim 1, wherein a plurality of the spacing members are formed. 前記底板の先端部を下方へ傾斜させ、補強鋼板の圧入により支障物を排除することを特徴とする請求項1または2記載の耐震補強鋼板設置方法。 The method for installing a seismic reinforced steel plate according to claim 1 or 2, wherein the obstruction is removed by inclining the tip of the bottom plate downward and press-fitting the reinforced steel plate. 端部に継手を有する補強鋼板を建て込んで巻き立て、閉合した補強鋼板と柱状構造物躯体との間に充填材を充填する耐震補強方法において、
躯体と補強鋼板との間隔を保持する間隔材を、その下辺を躯体側へ向けて下方へ傾斜するように補強鋼板下端部に形成し、補強鋼板を地中へ圧入することを特徴とする柱状構造物の耐震補強鋼板設置方法。
In the seismic strengthening method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A columnar material characterized in that a spacing member for maintaining a space between the housing and the reinforcing steel plate is formed at the lower end of the reinforcing steel plate so that the lower side thereof is inclined downward toward the housing side, and the reinforcing steel plate is press-fitted into the ground. How to install seismic reinforced steel sheets for structures.
前記間隔材を複数形成することを特徴とする請求項4記載の柱状構造物の耐震補強鋼板設置方法。The method for installing a seismic reinforced steel plate for a columnar structure according to claim 4, wherein a plurality of the spacing members are formed. 端部に継手を有する補強鋼板を建て込んで巻き立て、閉合した補強鋼板と柱状構造物躯体との間に充填材を充填する耐震補強方法において、
補強鋼板下端部を斜めにカットして躯体に対向して補強鋼板を圧入し、カットした傾斜部で支障物を排除することを特徴とする柱状構造物の耐震補強鋼板設置方法。
In the seismic strengthening method in which a reinforcing steel plate having a joint at the end is built up and wound, and a filler is filled between the closed reinforcing steel plate and the columnar structure housing,
A method of installing a seismic reinforced steel plate for a columnar structure, wherein the lower end portion of the reinforced steel plate is cut obliquely, the reinforcing steel plate is press-fitted against the housing, and obstacles are eliminated by the cut inclined portion.
カットした傾斜部に沿って底板を形成し、底板先端を躯体に近接または当接させて補強鋼板を地中へ圧入することを特徴とする請求項記載の耐震補強鋼板設置方法。 7. The method of installing a seismic reinforced steel plate according to claim 6, wherein a bottom plate is formed along the cut inclined portion, and the reinforcing steel plate is press-fitted into the ground with the bottom plate tip approaching or contacting the housing.
JP2007244151A 2007-09-20 2007-09-20 Seismic strengthened steel plate installation method for columnar structures Expired - Fee Related JP5101961B2 (en)

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