JP3564669B2

JP3564669B2 - Reinforcement spacer and foundation pile method

Info

Publication number: JP3564669B2
Application number: JP18990494A
Authority: JP
Inventors: 正行矢野
Original assignee: Tokyu Construction Co Ltd
Current assignee: Tokyu Construction Co Ltd
Priority date: 1994-07-20
Filing date: 1994-07-20
Publication date: 2004-09-15
Anticipated expiration: 2019-09-15
Also published as: JPH0827784A

Description

【０００１】
【産業上の利用分野】
本発明は配筋スペーサ及び基礎杭工法に関するものである。
【０００２】
【従来の技術】
山岳地等の大型機械の搬入が困難な現場で深礎杭を構築する工法としては、図１０に示すように地山にライナープレートａを組み付けて山留工を施しながら所定の深度まで掘進した後、ライナープレートａの内側に鉄筋を建て込んで鉄筋篭ｂを組み立て、最後にコンクリートを打設して現場打ちによる杭を構築する工法が知られている。
また前記鉄筋篭ｂを正確に組み立てるため、鉄筋の建て込みに先行して鋼棒を短く切断して製作した棒状スペーサｃ群をライナープレートａのフランジｆに溶接により固着している。また鉄筋篭ｂは各スペーサｃに鉛直方向に向けて主筋ｄを取り付けた後、主筋ｄの外方にフープ筋ｅを水平方向に向けて取り付けて組み立てている。
【０００３】
【発明が解決しようとする問題点】
前記した杭の施工技術にあっては、次のような問題点がある。
＜イ＞スペーサｃが単なる棒状で強度的に弱いことから、鉄筋篭ｂの自重やコンクリートの打設圧等によりスペーサが曲がり易く、配筋精度が低い難点がある。＜ロ＞スペーサｃの取り付けを溶接により行っているため溶接不良が生じ易い。＜ハ＞坑内での溶接作業なるため、溶接により発生した有毒ガスが充満して作業環境が悪化し作業者の安全性が脅かされるだけでなく、安全策を講じる必要がある。
【０００４】
【本発明の目的】
本発明は以上の問題を解決するために成されたもので、その目的とするところは、鉄筋の配筋精度が高くなると共に、作業環境の改善を図ることができる、配筋スペーサおよび基礎杭工法を提供することにある。
【０００５】
【問題点を解決するための手段】
即ち本発明は、縦孔の内周面に組み付けられたライナープレートの内周面に取り付けられライナープレートから離隔して鉄筋を支持する配筋スペーサにおいて、連続性を有する一対の脚部を有し、前記各脚部の端にライナープレートに連結するための連結孔を形成し、前記連結孔を利用してライナープレートの内周面にボルト止めすることを特徴とする、配筋スペーサである。また本発明は、縦孔の内周面に組み付けられたライナープレートの内周面に取り付けられライナープレートから離隔して鉄筋を支持する配筋スペーサにおいて、一対の脚部と前記脚部間を接続する中間部とを有し、前記各脚部の端にライナープレートに連結するための連結孔を形成し、前記連結孔を利用してライナープレートの内周面にボルト止めすることを特徴とする、配筋スペーサである。また本発明は、縦孔の内周面に組み付けられたライナープレートの内周面に取り付けられライナープレートから離隔して鉄筋を支持する配筋スペーサにおいて、一対の脚部と前記脚部間を接続する中間部と一対の脚部間に横架させた補助支持部とを有し、前記各脚部の端にライナープレートに連結するための連結孔を形成し、前記連結孔を利用してライナープレートの内周面にボルト止めすることを特徴とする、配筋スペーサである。また本発明は、縦孔の内周面に組み付けられたライナープレートの内周面に取り付けられライナープレートから離隔して鉄筋を支持する配筋スペーサにおいて、一つの脚部と前記脚部の途上に脚部の交差方向に延設した複数の補助支持部とを有し、前記各脚部の端にライナープレートに連結するための連結孔を形成したことを特徴とする、配筋スペーサである。また本発明は、前記記載の配筋スペーサにおいて、前記連結孔の一部にボルトの横方向からの装着を可能とする切欠部を形成したことを特徴とする、配筋スペーサである。また本発明は、前記記載の配筋スペーサにおいて、ライナープレートの内周面にボルト止めすることを特徴する、配筋スペーサである。また本発明は、地盤を掘削しつつ、ライナープレートを組立てて地山を支持して縦孔を開設した後、ライナープレートの内側に鉄筋篭を組み立てて、縦孔内にコンクリートを打設して基礎杭を構築する基礎杭工法において、前記記載のいずれかの配筋スペーサを使用し、ライナープレートの組み付けと並行して、前記配筋スペーサをライナープレートの内周面にボルト止めによって取り付け、前記配筋スペーサを介して鉄筋篭を支持することを特徴とする、基礎杭工法である。また本発明は、地盤を掘削しつつ、ライナープレートを組立てて地山を支持して縦孔を開設した後、ライナープレートの内側に鉄筋篭を組み立てて、縦孔内にコンクリートを打設して基礎杭を構築する基礎杭工法において、前記記載のいずれかの配筋スペーサを使用し、ライナープレートの組み付けと並行して、前記配筋スペーサをライナープレートの内周面にボルト止めによって取り付け、前記各配筋スペーサに鉛直方向に向けて補助筋を取り付け、前記補助筋にフープ筋を多段的に取り付け、前記フープ筋に跨がって鉛直方向に向けて主筋を取り付けて鉄筋篭を組み立てることを特徴とする、基礎杭工法である。
【０００６】
【実施例１】
以下図面を参照しながら本発明の一実施例について説明する。
＜イ＞配筋スペーサ
配筋スペーサ１０はライナープレート３０の内周面に取り付けて、鉄筋を所定の距離を隔てて支持するための間隙調整部材で、例えば図１に示すように１本の鋼棒を略コ字形に屈曲し、両端部に形成した一対の脚部１１，１１と、脚部１１，１１間に形成される中間部１２とを具備している。各脚部１１の端部には連結孔となるボルト孔１３が形成されていて、ボルト２０、ナット２１を介して重合するライナープレート３０のフランジ３１にボルト止めできるようになっている。尚、フランジ３１への取付安定性を考慮すると、ボルト孔１２を形成する各脚部１１の端部を偏平させて形成することが望ましい。
【０００７】
＜ロ＞配筋スぺーサの形状
配筋スぺーサ１０の形状は、コ字形に限定されるものではなく、略台形、略Ｕ字形、略Ｖ字形であってもよく、要は連続性を有する一対の脚部１１，１１を具備していれば良い。
また脚部１１の脚長や中間部１２の全長は設計的事項であり、鉄筋の被り厚や配筋ピッチ等を考慮して適宜選択する。
またボルト孔１３，１３の形成間隔をライナープレート３０に開設されているボルト孔３２のピッチに一致させておくと、ライナープレート３０に配筋スペーサ１０を取付するためにボルト孔を追加して穿設する必要がない。
【０００８】
【作用】
次に配筋スペーサ１０を用いた基礎杭工法について説明する。
＜イ＞掘削工・山留工
図２に示すように公知の掘削手段により縦孔４０を掘削する。
掘削作業と並行して縦孔４０内で円弧状のライナープレート３０を環状に組み立てて地山を支持する。
【０００９】
＜ロ＞配筋ライナーの取付
環状の各ライナープレート３０を階層的に組み付ける際、図１のように重合させてフランジ３１に配筋スぺーサ１０を載置し、ボルト孔１３，３２に挿通したボルト２０にナット２１を螺着して、配筋スぺーサ１０も同時に組み付ける。
このようにライナープレート３０の組み立てと並行してフランジ３１に所定の間隔を隔てて配筋スペーサ１０を取付する。
この際、各配筋スぺーサ１０を鉛直線上に揃えて多段的に取り付ける。
【００１０】
＜ハ＞補助筋の建て込み
所定深度まで縦孔４０を掘削したら、ライナープレート３０の内側で同一鉛直線上に配列した各配筋スペーサ１０に沿わせて補助筋５０を建て込み、結束或いは溶接等により取り付ける。
補助筋５０は図３に示すように、配筋スペーサ１０の中間部１２に当接させることの他に、一点鎖線で示すように脚部１１に当接させて取り付けてもよい。補助筋５０を脚部１１に取り付ける場合、鉄筋の被り厚に応じて任意の位置に取り付けできる。また補助筋５０は配筋スペーサ１０の内外いずれの面に当接させても良い。
【００１１】
＜ニ＞フープ筋の取り付け（図４）
つぎに縦方向に向けて配筋した全補助筋５０の内側面に当接させてフープ筋５１を多段的に取り付ける。
【００１２】
＜ホ＞主筋の取り付け（図５）
最後にフープ筋５１の内側に複数の主筋５２を所定の間隔で取り付けて、補助筋５０、フープ筋５１，主筋５２群により構成される鉄筋篭５３の組み立てを完了する。鉄筋篭５３の重量は各配筋スペーサ１０を介してライナープレート３０に支持させる。
【００１３】
＜ヘ＞コンクリート打設
縦孔４０内にコンクリートを打設して鉄筋コンクリート製の深礎杭を構築する。コンクリートの打設圧が鉄筋篭５３を介して配筋スペーサ１０に負荷するが、ライナープレート３０に強固にボルト止めされ、かつ一対の脚部１１，１１に分散して支持されているから、配筋スペーサ１０の変形が効果的に阻止される。
【００１４】
【実施例２】
他の配筋スぺーサ１０ａとしては図６に示すように各脚部１２の端部近くをほぼ直角に折曲したＣ字形を呈していても良い。
【００１５】
【実施例３】
他の配筋スぺーサ１０ｂとしては図７に示すように対向する脚部１２、１２間に中間部１２と平行に又は交差方向に向けて補助支持部１４を横架させてもよい。補助支持部１４は一本又は複数本の鋼棒で構成し、適宜の間隔を隔てて脚部１２に溶接して固着する。
本実施例にあっては、中間部１２だけでなく補助支持部１４にも鉄筋を取り付けできるので、多重筋の配筋が可能となる。
【００１６】
【実施例４】
他の配筋スぺーサ１０ｃとしては図８に示すように１つの脚部１２に着部１２と直交する方向に向けて複数の補助支持部１４を設け、全体形が略Ｆ字形を呈するものであってもよい。
補助支持部１４の形成方向は脚部１１の片側で同一方向に揃える場合と、脚部１１の両側に設ける場合がある。
本実施例にあっても、被り厚に応じた補助支持部１４位置で鉄筋を取り付けできるだけでなく、多重筋の配筋が可能となる。
【００１７】
【実施例５】
以上の各実施例において、脚部１１の端部を図９のように切欠いて切欠部１５を形成したものであってもよい。
また脚１１が一対の場合は切欠部１５を同一方向に揃えておく。
本実施例にあっては図１に示すボルト２０を抜かずに緩めた状態で設置できるので、ライナープレートの組み立て後に配筋スペーサを追加して設置するときに有利である。
また、切欠部１２はボルトをボルト孔１３内に導入を嵌装できればよいから、その形成位置は任意の位置でよい。
【００１８】
【実施例６】
配筋スペーサをライナープレートに取り付けるための連結手段は、ボルト２０およびナット２１に限られるものでなく、ボルト孔１３を介して配筋スペーサをライナープレートへ取り付けられるものであればその他のものであってもよい。例えば、ボルト孔１３に挿通可能なピン部材やクリップ部材などが採用できる。
【００１９】
【発明の効果】
本発明は以上説明したようになるから次のような効果を得ることができる。
＜イ＞ライナープレートへボルト止め可能な配筋スペーサを使用することで、配筋スペーサの取付不良を解消できると共に、鉄筋の配筋精度を高めることができる。
＜ロ＞ライナープレートの組み立てと並行して配筋スペーサを設置できるから、工期を大幅に短縮できる。
＜ハ＞配筋スペーサの取付けに溶接作業が不要であるから、配筋スペーサを取り付ける際に有害ガスが発生することもなく作業環境を大幅に改善できる。
＜ニ＞配筋スペーサの脚部の端に形成したボルト孔を利用してライナープレートにボルト止めして強固に取付でき、配筋スペーサの設置が容易にできる。
＜ホ＞脚部に補助支持部を設けることで、二重筋、三重筋等の多重筋の配筋が可能である。
＜へ＞配筋スペーサの脚部の端に形成したボルト孔の一部に切欠部を形成しておくと、ボルトを抜かずに緩めるだけで配筋スペーサを設置できる。
＜ト＞径の異なる鉄筋であっても一種類の配筋スペーサで以て支持できる。
【図面の簡単な説明】
【図１】実施例１に係る配筋スペーサの斜視図
【図２】ライナープレートに配筋スペーサを取付した縦孔の縦断面図
【図３】補助筋の配筋例を示す配筋スぺーサの一部を省略した平面図
【図４】補助筋及びフープ筋を設置した縦孔の平面図
【図５】主筋を設置した縦孔の平面図
【図６】脚部の端部を屈曲した実施例２に係る配筋スペーサの平面図
【図７】補助支持部を設けた実施例３に係る配筋スペーサの平面図
【図８】脚部に複数の補助支持部を設けた実施例４に係る配筋スペーサの平面図
【図９】ボルト孔の一部に切欠部を設けた実施例４の説明図
【図１０】従来技術の説明図[0001]
[Industrial applications]
The present invention relates to a reinforcing spacer and a foundation pile construction method.
[0002]
[Prior art]
As a method of constructing a deep foundation pile at a site where it is difficult to carry a large machine such as a mountainous area, as shown in FIG. 10, a liner plate a is assembled to the ground and excavation is performed to a predetermined depth while performing a mountain retaining work. Later, a construction method is known in which a reinforcing bar is assembled inside a liner plate a to assemble a reinforcing bar cage b, and finally, concrete is cast and a pile is cast in place.
Further, in order to assemble the reinforcing bar b accurately, a bar-shaped spacer group c formed by cutting a steel bar short before mounting the reinforcing bar is fixed to the flange f of the liner plate a by welding. The reinforcing bar b is assembled by attaching a main bar d to each spacer c in a vertical direction, and then attaching a hoop bar e to the outside of the main bar d in a horizontal direction.
[0003]
[Problems to be solved by the invention]
The above-described pile construction technology has the following problems.
<A> Since the spacer c is merely a rod-shaped and weak in strength, there is a problem that the spacer is easily bent due to the weight of the reinforcing bar b or the pressure of concrete, and the accuracy of arrangement of the reinforcing bars is low. <B> Since the spacer c is attached by welding, poor welding is likely to occur. <C> Since the welding work is performed in the mine, not only is the toxic gas generated by welding filled up, the working environment is degraded and the safety of workers is threatened, but also safety measures need to be taken.
[0004]
[Object of the present invention]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a reinforcement spacer and a foundation pile which can improve the arrangement accuracy of reinforcing bars and improve the working environment. To provide a construction method.
[0005]
[Means for solving the problem]
That is, the present invention has a pair of leg portions having continuity in a reinforcing bar spacer that is attached to the inner peripheral surface of a liner plate that is assembled to the inner peripheral surface of a vertical hole and that supports a reinforcing bar apart from the liner plate. A connecting hole for connecting to a liner plate at an end of each of the leg portions, and bolting to an inner peripheral surface of the liner plate using the connecting hole . Also, the present invention provides a reinforcing bar spacer attached to the inner peripheral surface of a liner plate attached to the inner peripheral surface of a vertical hole and spaced apart from the liner plate to support a reinforcing bar, and connects a pair of legs and the legs. And a connection hole for connecting to a liner plate at an end of each of the legs, and bolted to an inner peripheral surface of the liner plate using the connection hole. , A bar arrangement spacer. Also, the present invention provides a reinforcing bar spacer attached to the inner peripheral surface of a liner plate attached to the inner peripheral surface of a vertical hole and spaced apart from the liner plate to support a reinforcing bar, and connects a pair of legs and the legs. An intermediate portion to be formed and an auxiliary support portion suspended laterally between a pair of legs, a connection hole for connecting to a liner plate at an end of each of the legs , and a liner utilizing the connection hole. It is a reinforcement arrangement spacer characterized by being bolted to the inner peripheral surface of the plate . Further, the present invention provides a reinforcing bar spacer attached to the inner peripheral surface of a liner plate attached to the inner peripheral surface of a vertical hole and supporting a reinforcing bar apart from the liner plate. A reinforcing arrangement spacer having a plurality of auxiliary support portions extending in a crossing direction of the leg portions, and a connection hole for connecting to a liner plate is formed at an end of each leg portion. According to the present invention, there is provided the reinforcing bar spacer according to the above-described reinforcing spacer, wherein a cutout portion is formed in a part of the connection hole so that a bolt can be mounted in a lateral direction. According to the present invention, there is also provided the reinforcing bar spacer described above, wherein the reinforcing member is bolted to an inner peripheral surface of the liner plate. In addition, the present invention, while excavating the ground, after assembling the liner plate to support the ground and open a vertical hole, assembling a steel cage inside the liner plate, casting concrete in the vertical hole. in foundation piles method for building foundation piles, use one of the reinforcement spacer of the described, in parallel with the assembly of the liner plate, attached by bolting the reinforcement spacer on the inner peripheral surface of the liner plate, the This is a foundation pile construction method characterized by supporting a reinforcing cage through a reinforcing spacer. In addition, the present invention, while excavating the ground, after assembling the liner plate to support the ground and open a vertical hole, assembling a steel cage inside the liner plate, casting concrete in the vertical hole. in foundation piles method for building foundation piles, use one of the reinforcement spacer of the described, in parallel with the assembly of the liner plate, attached by bolting the reinforcement spacer on the inner peripheral surface of the liner plate, the Assembling the reinforcing bars in each reinforcing spacer in the vertical direction, attaching hoops in multiple stages to the auxiliary muscles, and attaching the main bars in the vertical direction across the hoops. Characterized by the foundation pile method.
[0006]
Embodiment 1
An embodiment of the present invention will be described below with reference to the drawings.
<A> Reinforcement spacer The reinforcement spacer 10 is a gap adjusting member that is attached to the inner peripheral surface of the liner plate 30 to support the rebar at a predetermined distance. For example, as shown in FIG. The steel bar is bent in a substantially U-shape, and includes a pair of legs 11, 11 formed at both ends and an intermediate portion 12 formed between the legs 11, 11. A bolt hole 13 serving as a connection hole is formed at an end of each leg portion 11 so that the leg portion 11 can be bolted to a flange 31 of a liner plate 30 that overlaps via a bolt 20 and a nut 21. In consideration of the mounting stability to the flange 31, it is desirable that the end of each leg 11 forming the bolt hole 12 is formed flat.
[0007]
<B> Shape of Reinforcement Spacer The shape of the reinforcement arrangement spacer 10 is not limited to the U-shape, but may be a substantially trapezoidal shape, a substantially U-shaped shape, or a substantially V-shaped shape. What is necessary is just to have the pair of leg parts 11 and 11 which have.
The leg length of the leg 11 and the total length of the intermediate portion 12 are design matters, and are appropriately selected in consideration of the thickness of the reinforcing bar, the arrangement pitch of the reinforcing bars, and the like.
If the pitch of the bolt holes 13 is matched with the pitch of the bolt holes 32 formed in the liner plate 30, bolt holes are additionally drilled in order to attach the reinforcing spacer 10 to the liner plate 30. No need to set up.
[0008]
[Action]
Next, a foundation pile construction method using the reinforcement arrangement spacer 10 will be described.
<A> Excavation / Screshing As shown in FIG. 2, the vertical hole 40 is excavated by a known excavation means.
In parallel with the excavation work, the arc-shaped liner plate 30 is assembled in an annular shape in the vertical hole 40 to support the ground.
[0009]
<B> Mounting of Reinforcement Liner When assembling the annular liner plates 30 in a hierarchical manner, the reinforcement arrangement spacer 10 is placed on the flange 31 by being superposed as shown in FIG. 1 and inserted into the bolt holes 13 and 32. The nut 21 is screwed onto the bolt 20 thus set, and the reinforcing arrangement spacer 10 is also assembled at the same time.
As described above, the reinforcing spacers 10 are attached to the flange 31 at predetermined intervals in parallel with the assembly of the liner plate 30.
At this time, the reinforcing arrangement spacers 10 are aligned in a vertical line and attached in multiple stages.
[0010]
When the vertical hole 40 is excavated to a predetermined depth, the auxiliary muscle 50 is erected along the reinforcing bar spacers 10 arranged on the same vertical line inside the liner plate 30, and the auxiliary muscle 50 is tied or welded. Attach by
As shown in FIG. 3, the auxiliary muscle 50 may be attached to the leg 11 as shown by a dashed line in addition to being brought into contact with the intermediate portion 12 of the reinforcement arrangement spacer 10. When the auxiliary muscle 50 is attached to the leg 11, it can be attached to any position according to the thickness of the reinforcing bar. In addition, the auxiliary muscle 50 may be brought into contact with any of the inner and outer surfaces of the reinforcement arrangement spacer 10.
[0011]
<D> Attaching the hoop muscle (Figure 4)
Next, the hoop muscles 51 are attached in multiple stages by abutting on the inner surfaces of all the auxiliary muscles 50 arranged in the vertical direction.
[0012]
<E> Installation of main bar (Fig. 5)
Finally, a plurality of main bars 52 are attached to the inside of the hoop bars 51 at predetermined intervals, and the assembly of the reinforcing bar basket 53 constituted by the auxiliary bars 50, the hoop bars 51, and the main bars 52 is completed. The weight of the reinforcing bar 53 is supported by the liner plate 30 via the reinforcing bar spacers 10.
[0013]
<F> Concrete is poured into the vertical shaft 40 to construct a reinforced concrete deep foundation pile. Although the concrete placing pressure is applied to the reinforcing spacers 10 via the reinforcing cages 53, since the bolts are firmly bolted to the liner plate 30 and are dispersed and supported by the pair of legs 11, 11, the reinforcing arrangement is performed. The deformation of the muscle spacer 10 is effectively prevented.
[0014]
Embodiment 2
As shown in FIG. 6, the other reinforcement arrangement spacer 10a may have a C-shape in which the vicinity of the end of each leg 12 is bent substantially at a right angle.
[0015]
Embodiment 3
As another reinforcement arrangement spacer 10b, as shown in FIG. 7, an auxiliary support portion 14 may be laid between the opposed leg portions 12 in a direction parallel to the intermediate portion 12 or in a cross direction. The auxiliary support portion 14 is formed of one or more steel rods, and is fixed to the leg portion 12 by welding at appropriate intervals.
In the present embodiment, the reinforcing bars can be attached not only to the intermediate portion 12 but also to the auxiliary supporting portions 14, so that multiple bars can be arranged.
[0016]
Embodiment 4
As shown in FIG. 8, another reinforcing arrangement spacer 10c is provided with a plurality of auxiliary supporting portions 14 on one leg portion 12 in a direction perpendicular to the attaching portion 12, so that the overall shape is substantially F-shaped. It may be.
The auxiliary support portion 14 may be formed on one side of the leg 11 in the same direction, or may be provided on both sides of the leg 11.
Also in the present embodiment, not only can the reinforcing bar be attached at the position of the auxiliary support portion 14 according to the covering thickness, but also multiple bars can be arranged.
[0017]
Embodiment 5
In each of the above embodiments, the notch 15 may be formed by notching the end of the leg 11 as shown in FIG.
When there are a pair of legs 11, the notches 15 are aligned in the same direction.
In the present embodiment, since the bolts 20 shown in FIG. 1 can be installed in a loosened state without being pulled out, it is advantageous when additionally installing reinforcing bar spacers after assembling the liner plate.
Further, the notch portion 12 only needs to be able to insert a bolt into the bolt hole 13, and thus the formation position may be any position.
[0018]
Embodiment 6
The connecting means for attaching the reinforcing bar spacer to the liner plate is not limited to the bolts 20 and the nuts 21, but may be any other device that can attach the reinforcing bar spacer to the liner plate via the bolt hole 13. You may. For example, a pin member or a clip member that can be inserted into the bolt hole 13 can be adopted.
[0019]
【The invention's effect】
Since the present invention has been described above, the following effects can be obtained.
<A> By using the reinforcing bar spacer that can be bolted to the liner plate, it is possible to eliminate the defective mounting of the reinforcing bar spacer and to improve the reinforcing bar reinforcing accuracy.
<B> Since the reinforcing spacers can be installed in parallel with the assembly of the liner plate, the construction period can be significantly reduced.
<C> Since no welding work is required for mounting the reinforcing bar spacers, no harmful gas is generated when mounting the reinforcing bar spacers, and the working environment can be greatly improved.
By utilizing the bolt holes formed in the ends of the legs of the <D> Haisuji spacer can firmly mounted bolted to the liner plate, can be easily installed in Haisuji spacer.
<E> By providing the auxiliary support portions on the legs, it is possible to arrange multiple bars such as double bars and triple bars.
<H> If a notch is formed in a part of the bolt hole formed at the end of the leg of the reinforcing spacer, the reinforcing spacer can be installed simply by loosening the bolt without removing it.
<G> Even reinforcing bars having different diameters can be supported by one type of reinforcing bar spacer.
[Brief description of the drawings]
FIG. 1 is a perspective view of a reinforcing bar spacer according to a first embodiment. FIG. 2 is a longitudinal sectional view of a vertical hole in which a reinforcing bar is attached to a liner plate. FIG. FIG. 4 is a plan view of a vertical hole in which auxiliary muscles and hoop muscles are installed. FIG. 5 is a plan view of a vertical hole in which main muscles are installed. FIG. 6 is a bent end of a leg. FIG. 7 is a plan view of the reinforcing bar spacer according to the second embodiment. FIG. 7 is a plan view of the reinforcing bar spacer according to the third embodiment having an auxiliary support portion. FIG. 8 is an embodiment in which a plurality of auxiliary support portions are provided on a leg portion. FIG. 9 is an explanatory view of a fourth embodiment in which a notch is provided in a part of a bolt hole. FIG. 10 is an explanatory view of a conventional technique.

Claims

In a reinforcing bar spacer attached to the inner peripheral surface of the liner plate assembled to the inner peripheral surface of the vertical hole and spaced apart from the liner plate to support the reinforcing steel,
It has a pair of legs with continuity,
Forming a connection hole at the end of each leg for connecting to a liner plate ,
It is characterized by being bolted to the inner peripheral surface of the liner plate using the connection hole ,
Bar arrangement spacer.

In a reinforcing bar spacer attached to the inner peripheral surface of the liner plate assembled to the inner peripheral surface of the vertical hole and spaced apart from the liner plate to support the reinforcing steel,
A pair of legs,
An intermediate portion connecting the legs,
Forming a connection hole at the end of each leg for connecting to a liner plate ,
It is characterized by being bolted to the inner peripheral surface of the liner plate using the connection hole ,
Bar arrangement spacer.

In a reinforcing bar spacer attached to the inner peripheral surface of the liner plate assembled to the inner peripheral surface of the vertical hole and spaced apart from the liner plate to support the reinforcing steel,
A pair of legs,
An intermediate portion connecting between the legs,
Having an auxiliary support portion laid horizontally between a pair of legs,
Forming a connection hole at the end of each leg for connecting to a liner plate ,
A reinforcing arrangement spacer which is bolted to the inner peripheral surface of the liner plate using the connection hole .

In a reinforcing bar spacer attached to the inner peripheral surface of the liner plate assembled to the inner peripheral surface of the vertical hole and spaced apart from the liner plate to support the reinforcing steel,
One leg,
A plurality of auxiliary support portions extending in the cross direction of the leg portion on the way of the leg portion,
A connection hole for connecting to a liner plate is formed at an end of each of the legs,
Bar arrangement spacer.

The reinforcing bar spacer according to any one of claims 1 to 4,
A notch that allows a bolt to be mounted in a lateral direction is formed in a part of the connection hole,
Bar arrangement spacer.

The reinforcing bar spacer according to claim 4 ,
A reinforcing arrangement spacer characterized by being bolted to the inner peripheral surface of the liner plate.

After excavating the ground, assembling the liner plate and supporting the ground to form a vertical hole, assembling a reinforced cage inside the liner plate, placing concrete in the vertical hole, and constructing a foundation pile In the foundation pile method,
Using the reinforcing bar spacer according to any one of claims 1 to 6,
In parallel with the assembly of the liner plate, attached by bolting the reinforcement spacer on the inner peripheral surface of the liner plate,
Characterized by supporting a reinforcing cage through the reinforcing bar spacer,
Foundation pile method.

After excavating the ground, assembling the liner plate and supporting the ground to form a vertical hole, assembling a reinforced cage inside the liner plate, placing concrete in the vertical hole, and constructing a foundation pile In the foundation pile method,
Using the reinforcing bar spacer according to any one of claims 1 to 6,
In parallel with the assembly of the liner plate, attached by bolting the reinforcement spacer on the inner peripheral surface of the liner plate,
Auxiliary muscles are attached to each reinforcing bar in the vertical direction,
Attaching the hoop muscle to the auxiliary muscle in multiple stages,
Characterized by assembling a reinforcing bar by attaching a main reinforcing bar in the vertical direction across the hoop bar,
Foundation pile method.