JP2012162858A - Caisson and caisson installation method to foundation pile - Google Patents

Caisson and caisson installation method to foundation pile Download PDF

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JP2012162858A
JP2012162858A JP2011021923A JP2011021923A JP2012162858A JP 2012162858 A JP2012162858 A JP 2012162858A JP 2011021923 A JP2011021923 A JP 2011021923A JP 2011021923 A JP2011021923 A JP 2011021923A JP 2012162858 A JP2012162858 A JP 2012162858A
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caisson
foundation pile
concrete
pile
recess
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JP5725330B2 (en
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Tomohiro Bessho
友宏 別所
Kazuo Endo
和雄 遠藤
Yuichi Maeda
裕一 前田
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To place concrete for connecting a caisson and a pile head extremely quickly immediately after caisson installation by an inexpensive construction method.SOLUTION: By housing a pile head 2a of a foundation pile 2 projected on installation ground G inside a recessed part 11 opened on a lower surface 1a of a caisson 1 while lowering the caisson 1, the caisson 1 is installed on the foundation pile 2. Also, a lath net mold form 4 provided along the inner periphery of the recessed part 11 is lowered and grounded onto the installation ground G, and thereafter, by filling concrete 3 inside the recessed part 11 and inside the lath net mold form 4, the caisson 1 and the foundation pile 2 are integrated.

Description

本発明は、ケーソンおよび基礎杭へのケーソン設置方法に関する。   The present invention relates to a caisson and a caisson installation method on a foundation pile.

従来、海上基礎や立坑などの施工に用いるケーソンとして、海底地盤に対する支持強度を高めるために海底地盤に複数の基礎杭を打設し、それら基礎杭上にケーソンを据え付けて、杭頭部とケーソンとを結合する脚付きケーソンが知られている（例えば、特許文献１参照）。
特許文献１には、ケーソンの底版コンクリートにスリーブ管を埋設することにより形成した空所内に、基礎杭を貫通させてケーソンを沈設した後、空所内に杭頭結合コンクリートを水中打設してケーソンと基礎杭との一体化を図る施工方法について開示されている。 Conventionally, as caisson used for construction of offshore foundations and shafts, in order to increase the support strength to the submarine ground, multiple foundation piles are placed on the submarine ground, and caisson is installed on these foundation piles, and the pile head and caisson There is known a caisson with legs that connects the two (see, for example, Patent Document 1).
In Patent Document 1, after a caisson is sunk by penetrating a foundation pile in a void formed by embedding a sleeve tube in the bottom slab concrete of a caisson, a pile head-bound concrete is placed in the void and the caisson is placed in water. The construction method which aims at integration with a foundation pile is disclosed.

ところで、このような脚付きケーソンにおける杭頭部コンクリートは、ケーソンと杭基礎とを一体化させるため品質上、重要な部分となっている。また、この杭頭部コンクリートは、ケーソンの早期安定のため、据え付け直後に打設（底部コンクリートよりも早く打設）することから、杭との隙間には型枠が必要となっている。
図６は、このような型枠の一例を示しており、予めケーソン１の凹部１１の内周面にゴムチューブ１０を取り付けておき、鋼管杭などの基礎杭２の杭頭部２ａに凹部１１を配置させた状態でケーソン１を据え付けた後、そのゴムチューブ１０内にグラウトを充填させることにより膨張させて型枠とし、凹部１１内のコンクリート３の打設後にケーソン１と設置盤Ｇとの間に底部コンクリート３１を打設する施工方法によるものである。 By the way, the pile head concrete in such a caisson with a leg is an important part in terms of quality in order to integrate the caisson and the pile foundation. Moreover, since this pile head concrete is cast | placed immediately after installation (casting earlier than bottom concrete) for the early stabilization of a caisson, a formwork is needed for the clearance gap between piles.
FIG. 6 shows an example of such a formwork. A rubber tube 10 is attached in advance to the inner peripheral surface of the recess 11 of the caisson 1, and the recess 11 is formed on the pile head 2a of the foundation pile 2 such as a steel pipe pile. After the caisson 1 is installed with the rubber tube 10 placed, the rubber tube 10 is filled with grout to form a formwork. After the concrete 3 in the recess 11 is placed, the caisson 1 and the installation board G This is based on a construction method in which the bottom concrete 31 is placed in between.

特開平１０−１２１４５０号公報JP-A-10-121450

しかしながら、従来のケーソンの施工方法では、以下のような問題があった。
すなわち、ゴムチューブ１０にグラウトを注入して膨張させることで型枠とする図５に示す従来の方法では、基礎杭とスリーブ管とのクリアランスのアンバランスに対する対応が難しいことやゴムチューブ１０へのグラウト注入設備などにかかるコストが高価になるという問題があった。また、グラウトの養生期間を置かないと基礎杭２の杭頭部２ａのコンクリート３を打設することができなく、ケーソンの早期安定という点で改良の余地があった。 However, the conventional caisson construction method has the following problems.
That is, in the conventional method shown in FIG. 5 in which the grout is injected into the rubber tube 10 and expanded to form a mold, it is difficult to cope with the unbalance of the clearance between the foundation pile and the sleeve tube, There has been a problem that the cost of the grout injection equipment becomes expensive. Further, if the grout curing period is not provided, the concrete 3 of the pile head 2a of the foundation pile 2 cannot be placed, and there is room for improvement in terms of early stabilization of the caisson.

本発明は、上述する問題点に鑑みてなされたもので、安価な施工方法により、ケーソンと杭頭部とを結合するためのコンクリートをケーソン据え付け直後に極めて迅速に打設することができるケーソンおよび基礎杭へのケーソン設置方法を提供することを目的とする。   The present invention was made in view of the above-described problems, and a caisson capable of placing concrete for joining a caisson and a pile head very quickly immediately after caisson installation by an inexpensive construction method and The purpose is to provide caisson installation method to foundation pile.

上記目的を達成するため、本発明に係るケーソンは、ケーソンの下面が開口しその内部に基礎杭の杭頭部が間隔をもって収容可能な凹部と、凹部の内周面に沿ってこの凹部よりも下方へ突出可能に設けられた筒状通水性型枠と、を備えていることを特徴としている。   In order to achieve the above object, the caisson according to the present invention has a recessed portion in which the lower surface of the caisson is open and the pile heads of the foundation pile can be accommodated with a space therebetween, and the recessed portion along the inner peripheral surface of the recessed portion. And a cylindrical water-permeable mold provided so as to protrude downward.

また、本発明に係る基礎杭へのケーソン設置方法では、設置盤上に突出している基礎杭を、ケーソンを降下させつつケーソンの下面に開口している凹部内に収容することでケーソンを基礎杭上に設置するとともに、凹部の内周に沿って設けられている筒状通水性型枠を下降させて設置盤上に着底させ、その後、凹部内と筒状通水性型枠内にコンクリートを充填することでケーソンと基礎杭とを一体化することを特徴としている。   Moreover, in the caisson installation method to the foundation pile according to the present invention, the foundation pile protruding on the installation board is housed in the recess opened in the lower surface of the caisson while lowering the caisson, so that the caisson is accommodated in the foundation pile. The cylindrical water-permeable mold provided along the inner periphery of the concave portion is lowered and settled on the installation board, and then concrete is placed in the concave portion and the cylindrical water-permeable mold. It is characterized by integrating the caisson and the foundation pile by filling.

本発明では、ケーソンを凹部に基礎杭の杭頭部が配置する所定高さまで降下させて据え付けた後、筒状通水性型枠を下げて設置盤に着底させるといった簡単な構造及び方法により、設置盤とケーソン下面との間の杭頭部の周囲に型枠を設置することができる。その後、凹部の内側へ水中不分離性のコンクリートを打設して充填し、杭頭部とケーソンとを一体化させることで設置が完了する。このとき、ケーソンの下側において筒状通水性型枠が型枠として機能するので、水は流出しても打設されたコンクリートが周囲へ流出するのを抑えることができる。   In the present invention, after the caisson is lowered and installed to a predetermined height where the pile head of the foundation pile is placed in the recess, the cylindrical water-permeable form is lowered and settled on the installation panel, A formwork can be installed around the pile head between the installation board and the lower surface of the caisson. Thereafter, underwater inseparable concrete is cast and filled inside the recess, and the pile head and caisson are integrated to complete the installation. At this time, since the cylindrical water-permeable formwork functions as a formwork on the lower side of the caisson, it is possible to suppress the poured concrete from flowing out to the surroundings even if water flows out.

また、筒状通水性型枠を凹部より下方に向けて突出させる作業は、ケーソンの据え付けとほぼ同時に行え、しかも筒状通水性型枠を設置盤に着底した時点で型枠の設置が完了となることから、筒状通水性型枠の設置直後にコンクリート打設を行うことができる。そのため、従来のゴムチューブをグラウトにより膨張させて型枠とする場合のようにグラウトの硬化を待つことがなく、またグラウト注入設備を別で準備する必要もなくなるので、施工にかかる時間の短縮とコストの低減を図ることができる。
さらに、筒状通水性型枠は打設したコンクリートに埋設されるため、硬化したコンクリート体の剛性を高めることができる。 Also, the projecting of the cylindrical water-permeable formwork downward from the recess can be performed almost simultaneously with the caisson installation, and the installation of the formwork is completed when the tubular water-permeable formwork is grounded on the installation panel. Therefore, the concrete can be placed immediately after the installation of the cylindrical water-permeable formwork. Therefore, it is not necessary to wait for the grout to harden as in the case where a conventional rubber tube is expanded by a grout to form a mold, and it is not necessary to prepare a grout injection facility separately. Cost can be reduced.
Furthermore, since the cylindrical water-permeable formwork is embedded in the cast concrete, the rigidity of the hardened concrete body can be increased.

また、本発明に係るケーソンでは、筒状通水性型枠は、下端が径方向内側に向けて漸次縮径されていることが好ましい。   Moreover, in the caisson according to the present invention, it is preferable that the cylindrical water-permeable form is gradually reduced in diameter toward the radially inner side at the lower end.

この場合、筒状通水性型枠の下端が径方向内側にすぼまった形状であるため、その型枠内に打設されるコンクリートの圧力で外方に押圧されても広がりにくくなっている。したがって、設置盤と筒状通水性型枠との間に隙間が生じることがなくなり、打設したコンクリートの型枠外への流出をより確実に抑えることができる。   In this case, since the lower end of the cylindrical water-permeable mold has a shape squeezed inward in the radial direction, it is difficult to spread even if pressed outward by the pressure of the concrete placed in the mold. . Therefore, no gap is generated between the installation board and the cylindrical water-permeable mold, and the outflow of the placed concrete outside the mold can be more reliably suppressed.

本発明のケーソンおよび基礎杭へのケーソン設置方法によれば、筒状通水性型枠を予めケーソンに組み込んでおくといった簡単な構造により、ケーソンと杭頭部との結合部に打設されるコンクリート用の型枠をケーソンの据え付け時に設置することが可能となり、ケーソンの据え付け直後に極めて迅速に、且つ周囲へ流出させることなくコンクリートを打設することができることから、安価な施工となる効果を奏する。   According to the caisson and the caisson installation method for the foundation pile of the present invention, the concrete that is cast in the joint portion between the caisson and the pile head by a simple structure in which a cylindrical water-permeable formwork is previously incorporated in the caisson. Can be installed at the time of caisson installation, and concrete can be placed very quickly immediately after caisson installation without causing it to flow around. .

本発明の実施の形態によるケーソンの全体構成を示す側断面図である。It is a sectional side view which shows the whole caisson structure by embodiment of this invention. 杭頭部のコンクリート打設状態を示す図である。It is a figure which shows the concrete placement state of a pile head. 図２に示すＡ−Ａ線断面図である。It is the sectional view on the AA line shown in FIG. （ａ）〜（ｃ）はケーソンの施工方法の工程を示す図である。(A)-(c) is a figure which shows the process of the construction method of a caisson. 図４（ｂ）の施工状態を示す部分斜視図である。It is a fragmentary perspective view which shows the construction state of FIG.4 (b). 従来のケーソン基礎のコンクリート打設状態を示す図である。It is a figure which shows the concrete placement state of the conventional caisson foundation.

以下、本発明の実施の形態によるケーソンおよび基礎杭へのケーソン設置方法について、図面に基づいて説明する。
図１に示すように、実施の形態によるケーソン１は、海や河川等の水中に据え付けられ、先行して施工されている鋼管杭からなる複数の基礎杭２、２、…のそれぞれの杭頭部２ａに対してコンクリート３により結合して据え付けられている。 Hereinafter, the caisson and the caisson installation method to a foundation pile by embodiment of this invention are demonstrated based on drawing.
As shown in FIG. 1, a caisson 1 according to an embodiment is installed in water such as a sea or a river, and a pile head of each of a plurality of foundation piles 2, 2,. It is installed by being connected to the part 2a by the concrete 3.

ケーソン１は、箱型、或いは円筒型をなし、その底部に複数の基礎杭２、２、…に対応する位置に下面側が開口するとともに、円孔状の内周面を形成した複数の凹部１１、１１、…を備えている。
そして、図２に示すように、凹部１１の天面１１ａには、ケーソン１の上方へ連絡されるコンクリート打設孔１２が設けられるとともに、その天面１１ａの外周部において周方向に所定の間隔（クリアランス）をもって上下方向に貫通する複数の挿通孔１３が設けられている。 The caisson 1 has a box shape or a cylindrical shape, and a plurality of recesses 11 having a bottom surface opened at positions corresponding to the plurality of foundation piles 2, 2,. , 11,...
Then, as shown in FIG. 2, the top surface 11a of the recess 11 is provided with a concrete placement hole 12 connected to the upper side of the caisson 1, and at a predetermined interval in the circumferential direction on the outer peripheral portion of the top surface 11a. A plurality of insertion holes 13 penetrating in the vertical direction with (clearance) are provided.

凹部１１は、内径が杭頭部２ａより大径をなし、その内周面と杭頭部２ａの外周面との間に所定の間隔をもって取り囲む大きさを有している（図３参照）。また、凹部１１の深さ寸法（ケーソン下面１ａから凹部１１の天面１１ａまでの長さ寸法）は、ケーソン１と設置盤Ｇとの間に所定の間隔を開けて配置させた状態で、杭頭と天面１１ａとの間に所定間隔が設けられる寸法に設定されている。   The recess 11 has a size that the inner diameter is larger than that of the pile head 2a and is surrounded with a predetermined interval between the inner peripheral surface thereof and the outer peripheral surface of the pile head 2a (see FIG. 3). In addition, the depth dimension of the concave portion 11 (the length dimension from the caisson lower surface 1a to the top surface 11a of the concave portion 11) is a pile with a predetermined gap between the caisson 1 and the installation panel G. The dimension is set such that a predetermined interval is provided between the head and the top surface 11a.

挿通孔１３は、凹部１１内へのコンクリート充填のため、コンクリート打設する時に用いるラス網型枠４（筒状通水性型枠）を凹部１１内で吊り下げるための吊り索５を挿通させる孔である。
ラス網型枠４は、金属製の周知の網状部材が用いられ、凹部１１の内周に沿う筒状（図３参照）をなし、下端４ａは径方向内側に向けて漸次縮径となるすぼまった形状となっている。そして、このラス網型枠４は、コンクリート打設前の凹部１１内において、吊り索５により凹部１１より下方へ向けて突出可能に吊り下げられた状態で配置されている。 The insertion hole 13 is a hole through which a suspension line 5 for suspending the lath net form frame 4 (tubular water-permeable formwork) used for placing concrete in the recess 11 for filling the recess 11 with concrete. It is.
The lath net form frame 4 is made of a well-known metal net-like member, has a cylindrical shape (see FIG. 3) along the inner periphery of the recess 11, and the lower end 4a is gradually reduced in diameter radially inward. It has a sunk shape. The lath net form frame 4 is arranged in a state in which the lath net form frame 4 is suspended so as to protrude downward from the concave portion 11 by the suspension rope 5 in the concave portion 11 before the concrete is placed.

次に、上述したケーソン１と基礎杭２との結合方法について図面に基づいて説明する。
先ず、図４（ａ）に示すように、予め各凹部１１内にラス網型枠４を配置させたケーソン１を降下させる。このとき、複数の基礎杭２、２、…のうち一部の杭頭にはジャッキ６（図２参照）を配置しておく。このジャッキ６は、ケーソン１を所定高さに調整するもので、ケーソン１の降下前に予めジャッキの高さが調整されている。すなわち、凹部１１の天面１１ａと基礎杭２の上端との間隔を調整するために用いられる。なお、図４では、複数の基礎杭２のうち１つおきにジャッキ６を配置させているが、ジャッキ６の数量、位置は任意であり、すべての基礎杭２のそれぞれにジャッキ６を設けるようにしてもかまわない。 Next, a method for connecting the caisson 1 and the foundation pile 2 described above will be described with reference to the drawings.
First, as shown in FIG. 4A, the caisson 1 in which the lath net form 4 is previously placed in each recess 11 is lowered. At this time, the jack 6 (refer FIG. 2) is arrange | positioned at some pile heads among the some foundation piles 2, 2, .... This jack 6 adjusts the caisson 1 to a predetermined height, and the height of the jack is adjusted in advance before the caisson 1 is lowered. That is, it is used to adjust the distance between the top surface 11 a of the recess 11 and the upper end of the foundation pile 2. In addition, in FIG. 4, although the jack 6 is arrange | positioned every other among the some foundation piles 2, the quantity and position of the jack 6 are arbitrary, and it is provided with the jack 6 in each of all the foundation piles 2 It doesn't matter.

そして、図４（ｂ）および図５に示すように、凹部１１に基礎杭２の杭頭部２ａが配置される所定高さまでケーソン１を降下させて据え付けた後、吊り索５によってラス網型枠４を下げて砕石敷き等された設置盤Ｇに着底させるといった簡単な構造及び方法により、設置盤Gとケーソン１の下面１ａとの間の杭頭部２ａの周囲に型枠（図５に示す符号Ｌ部分）を設置することができる。これにより、コンクリート打設前の工程が完了となる。   Then, as shown in FIGS. 4B and 5, after the caisson 1 is lowered and installed to the predetermined height at which the pile head 2 a of the foundation pile 2 is disposed in the recess 11, the lath net type is formed by the suspension rope 5. A formwork (FIG. 5) is formed around the pile head 2a between the installation board G and the lower surface 1a of the caisson 1 by a simple structure and method in which the frame 4 is lowered and settled on the installation board G that is crushed stone. Can be provided. Thereby, the process before concrete placement is completed.

その後、図４（ｃ）に示すように、各コンクリート打設孔１２から凹部１１の内側へ水中不分離性のコンクリート３を打設して充填し、基礎杭２の杭頭部２ａとケーソン１とを一体化させることで設置が完了する。このとき、ケーソン１の下側においてラス網型枠４が型枠として機能するので、水は流出しても打設されたコンクリート３が周囲へ流出するのを抑えることができる。   Thereafter, as shown in FIG. 4 (c), underwater non-separable concrete 3 is placed and filled from the concrete placement holes 12 to the inside of the recesses 11, and the pile head 2a of the foundation pile 2 and the caisson 1 are filled. The installation is completed. At this time, since the lath net formwork 4 functions as a formwork under the caisson 1, it is possible to prevent the cast concrete 3 from flowing out to the surroundings even if water flows out.

また、ラス網型枠４を凹部１１より下方に向けて突出させる作業は、ケーソン１の据え付けとほぼ同時に行え、しかもラス網型枠４を設置盤Gに着底した時点で型枠の設置が完了となることから、ラス網型枠４の設置直後にコンクリート打設を行うことができる。そのため、従来のゴムチューブをグラウトにより膨張させて型枠とする場合のようにグラウトの硬化を待つことがなく、またグラウト注入設備を別で準備する必要もなくなるので、施工にかかる時間の短縮とコストの低減を図ることができる。
さらに、ラス網型枠４は打設したコンクリート３に埋設されるため、硬化したコンクリート体３´の剛性を高めることができる。 Further, the operation of projecting the lath net form frame 4 downward from the recess 11 can be performed almost simultaneously with the installation of the caisson 1, and when the lath net form frame 4 is settled on the installation panel G, the form frame is installed. Since it is completed, the concrete can be placed immediately after the lath net formwork 4 is installed. Therefore, it is not necessary to wait for the grout to harden as in the case where a conventional rubber tube is expanded by a grout to form a mold, and it is not necessary to prepare a grout injection facility separately. Cost can be reduced.
Furthermore, since the lath net formwork 4 is embedded in the cast concrete 3, the rigidity of the hardened concrete body 3 'can be increased.

そして、ラス網型枠４の下端４ａ（図５参照）が径方向内側にすぼまった形状であるため、その型枠４内に打設されるコンクリート３の圧力で外方に押圧されても広がりにくくなっている。したがって、設置盤Ｇとラス網型枠４との間に隙間が生じることがなくなり、打設したコンクリート３の型枠４外への流出をより確実に抑えることができる。   And since the lower end 4a (refer FIG. 5) of the lath net formwork 4 is the shape which squeezed in the radial inside, it is pressed outward by the pressure of the concrete 3 cast in the formwork 4. It is also difficult to spread. Therefore, a gap is not generated between the installation board G and the lath net formwork 4, and the outflow of the placed concrete 3 to the outside of the formwork 4 can be more reliably suppressed.

上述のように本実施の形態によるケーソンおよび基礎杭へのケーソン設置方法では、ラス網型枠４を予めケーソン１に組み込んでおくといった簡単な構造により、ケーソン１と杭頭部２ａとの結合部に打設されるコンクリート３用の型枠をケーソン１の据え付け時に設置することが可能となり、ケーソン１の据え付け直後に極めて迅速に、且つ周囲へ流出させることなくコンクリート３を打設することができることから、安価な施工となる効果を奏する。   As described above, in the caisson installation method to the caisson and the foundation pile according to the present embodiment, the coupling portion between the caisson 1 and the pile head 2a is obtained by a simple structure in which the lath net formwork 4 is previously incorporated in the caisson 1. It is possible to install the formwork for the concrete 3 to be placed on the caisson 1 when installing the caisson 1, and to place the concrete 3 very quickly immediately after the caisson 1 is installed and without flowing out to the surroundings. Therefore, there is an effect that it is inexpensive construction.

以上、本発明によるケーソンおよび基礎杭へのケーソン設置方法の実施の形態について説明したが、本発明は上記の実施の形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
例えば、実施の形態では凹部１１の形状が円孔状であり、ラス網型枠４もその凹部１１に対応する筒状をなしているが、このような形状であることに限定されることはなく、杭頭部２ａ、すなわち基礎杭２の種類、大きさに応じて適宜設定することが可能である。
また、ラス網型枠４において、本実施の形態では下端４ａを径方向内側に縮径させた形状としているが、このような形状であることにも制限されることはない。 As mentioned above, although the embodiment of the caisson and the caisson installation method to the foundation pile according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention. is there.
For example, in the embodiment, the shape of the concave portion 11 is a circular hole shape, and the lath net form frame 4 also has a cylindrical shape corresponding to the concave portion 11, but is limited to such a shape. The pile head 2a, that is, the type and size of the foundation pile 2 can be set as appropriate.
Further, in the lath net form frame 4, in the present embodiment, the lower end 4a is reduced in diameter radially inward, but the shape is not limited to this.

さらに、本実施の形態ではラス網型枠４を凹部１１から下方へ突出させる方法として、吊り索５により吊り下げる方法としているが、例えばフック状のもので凹部１１内に仮固定させておき、適宜な解除手段によりその仮固定を外したときに、ラス網型枠４を自然に下降させるような方法によるものであっても良い。   Further, in the present embodiment, as a method of projecting the lath net form frame 4 downward from the recess 11, it is a method of hanging by the suspension cable 5, but for example, a hook-like thing is temporarily fixed in the recess 11, A method may be used in which the lath net form frame 4 is naturally lowered when the temporary fixing is removed by an appropriate releasing means.

その他、予め、ラス網型枠４を設置盤Ｇとケーソン下面１ａとの間で想定される離間距離よりも長めに降下させておき、ケーソン１を降下させる時には、ケーソン１の凹部天面１１ａがジャッキ６に当接するよりも先にラス網型枠４が設置盤Ｇに着底するするようにしても良い。このようにすると、ケーソン１が所定高さに設置されたときには吊り索５は緩んだ状態になっているが、特に差し支えなく、ケーソン設置と同時に型枠が設置されることになる。   In addition, when the lath net form frame 4 is lowered in advance longer than the separation distance assumed between the installation board G and the caisson lower surface 1a, and the caisson 1 is lowered, the concave top surface 11a of the caisson 1 is The lath net form frame 4 may be attached to the installation board G before contacting the jack 6. In this manner, when the caisson 1 is installed at a predetermined height, the suspension cable 5 is in a loose state, but there is no particular problem, and the formwork is installed simultaneously with the caisson installation.

その他、本発明の趣旨を逸脱しない範囲で、上記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、上記した実施の形態を適宜組み合わせてもよい。   In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described embodiments may be appropriately combined.

１ ケーソン
２ 基礎杭
２ａ 杭頭部
３ コンクリート
３´ コンクリート体
４ ラス網型枠（筒状通水性型枠）
４ａ 下端
５ 吊り索
６ ジャッキ
１１ 凹部
１１ａ 天面
１２ コンクリート打設孔
１３ 挿通孔
Ｇ 設置盤 1 Caisson 2 Foundation pile 2a Pile head 3 Concrete 3 'Concrete body 4 Lath net formwork (tubular water-permeable formwork)
4a Lower end 5 Suspension cable 6 Jack 11 Recess 11a Top surface 12 Concrete placement hole 13 Insertion hole G Installation board

Claims (3)

ケーソンの下面が開口しその内部に基礎杭の杭頭部が間隔をもって収容可能な凹部と、
該凹部の内周面に沿ってこの凹部よりも下方へ突出可能に設けられた筒状通水性型枠と、
を備えていることを特徴とするケーソン。 A concave portion in which the lower surface of the caisson is open and the pile heads of the foundation pile can be accommodated therein with a space therebetween;
A cylindrical water-permeable mold provided so as to protrude downward from the recess along the inner peripheral surface of the recess;
A caisson characterized by comprising. 前記筒状通水性型枠は、下端が径方向内側に向けて漸次縮径されていることを特徴とする請求項１に記載のケーソン。   2. The caisson according to claim 1, wherein the cylindrical water-permeable mold has a lower end that is gradually reduced in diameter radially inward. 設置盤上に突出している基礎杭を、ケーソンを降下させつつ前記ケーソンの下面に開口している凹部内に収容することで前記ケーソンを前記基礎杭上に設置するとともに、前記凹部の内周に沿って設けられている筒状通水性型枠を下降させて前記設置盤上に着底させ、その後、前記凹部内と前記筒状通水性型枠内にコンクリートを充填することで前記ケーソンと前記基礎杭とを一体化することを特徴とする基礎杭へのケーソンの設置方法。
The caisson is installed on the foundation pile by accommodating the foundation pile protruding on the installation board in a recess opened on the lower surface of the caisson while lowering the caisson, and on the inner periphery of the recess. The cylindrical water-permeable mold provided along the bottom is lowered on the installation board, and then the caisson and the above-mentioned caisson and the tubular water-permeable mold are filled with concrete by filling the concave portion and the cylindrical water-permeable mold with concrete. A method for installing caissons on a foundation pile characterized by integrating the foundation pile.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104314042A (en) * 2014-10-22 2015-01-28 天津港航工程有限公司 Construction method of breakwater in pile-supported cylindrical caisson structure

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JPS62248715A (en) * 1986-04-21 1987-10-29 Shimizu Constr Co Ltd Installation work for caisson
JPH01275810A (en) * 1988-04-26 1989-11-06 Shimizu Corp Caisson
JPH10121450A (en) * 1996-10-24 1998-05-12 Maeda Corp Binding engineering method of caison and foundation pile
JP2764447B2 (en) * 1989-12-26 1998-06-11 株式会社ジェイエスピー Ground structure such as pier support

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62248715A (en) * 1986-04-21 1987-10-29 Shimizu Constr Co Ltd Installation work for caisson
JPH01275810A (en) * 1988-04-26 1989-11-06 Shimizu Corp Caisson
JP2764447B2 (en) * 1989-12-26 1998-06-11 株式会社ジェイエスピー Ground structure such as pier support
JPH10121450A (en) * 1996-10-24 1998-05-12 Maeda Corp Binding engineering method of caison and foundation pile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104314042A (en) * 2014-10-22 2015-01-28 天津港航工程有限公司 Construction method of breakwater in pile-supported cylindrical caisson structure
CN104314042B (en) * 2014-10-22 2016-06-22 天津港航工程有限公司 Adopt the levee construction method of pile formula case barrel structure

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