JP6510690B1 - Construction method of underground structure - Google Patents
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- JP6510690B1 JP6510690B1 JP2018028410A JP2018028410A JP6510690B1 JP 6510690 B1 JP6510690 B1 JP 6510690B1 JP 2018028410 A JP2018028410 A JP 2018028410A JP 2018028410 A JP2018028410 A JP 2018028410A JP 6510690 B1 JP6510690 B1 JP 6510690B1
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- 238000010276 construction Methods 0.000 title claims abstract description 49
- 239000004576 sand Substances 0.000 claims abstract description 23
- 239000002689 soil Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 description 33
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
【課題】発進坑から到達坑にむけて推進しようとする函体の外形に対応するように箱形ルーフを組み配置して、発進坑もしくは到達坑から地中に圧入した後、この箱形ルーフ端部に函体を配置し、函体の推進とともに箱形ルーフを組み配置した内部の土砂を箱形ルーフといっしょに押し出す地下構造物の施工法において、到達坑を極力小さいものとする地下構造物の施工方法を提供する。【解決手段】函体を発進坑３に設置する前に、箱形ルーフ６を組み配置した内部の土砂の中を、管体２３を発進坑と到達坑４側間に貫通させ、発進坑に設置した函体の推進とともに箱形ルーフ、その内部の土砂および管体を到達側に押し出すとともに、これら到達坑側に押し出す前記箱形ルーフ、土砂、管体は順次解体して、この解体物は管体および函体の内部を発進坑へと搬送し、発進坑から地上に搬出する。【選択図】図７To assemble a box-shaped roof so as to correspond to the outer shape of a box to be propelled from a starting pit to a reaching pit and press-in the ground from the starting pit or the reaching pit, and then the box-shaped roof In the construction method of the underground structure which arranges the box body at the end and pushes the earth and sand inside the box roof assembled together with the box roof with the promotion of the box, the underground structure which makes the reaching pit as small as possible Provide the construction method of the object. SOLUTION: Before installing a box in the start pit 3, the pipe body 23 is penetrated between the start pit and the reach pit 4 in the inside of the earth and sand in which the boxed roof 6 is arranged, The boxed roof, the earth and sand and the pipe inside thereof are pushed out to the arrival side with the promotion of the installed box body, and the boxed roof, the earth and sand, the pipe pushed out to the arrival pit side are disassembled one by one. Transport the inside of the tube and box to the start pit and carry it out from the start pit to the ground. [Selected figure] Figure 7
Description
本発明は、鉄道、道路などの下部地中に大幅員の地下構造物を横断方向に掘進建設する際に上部交通に支障を与えることなく施工することができる地下構造物の施工法に関するものである。 The present invention relates to a construction method of an underground structure which can be constructed without obstructing the upper traffic when a large member of the underground structure is constructed in a cross direction in a lower ground such as a railway or a road. is there.
鉄道、道路などの下部地中に大幅員の地下構造物を横断方向に掘進させるには、上部交通を支承するための防護工が必要となり、管体等を水平に並列させるパイプルーフを設けることなどがあげられる。 In order to extend a large member underground structure transversely into the lower ground such as railways and roads, a protective structure is required to support upper traffic, and a pipe roof should be provided to horizontally align pipes etc. Etc.
しかし、先に別工事としてパイプルーフを形成し、その下や中を掘削して地下構造物を構築し、また地下構造物をパイプルーフ下に掘進させるようにしたのでは、このパイプルーフが存在する分だけ土被りが厚くなる。しかも、パイプルーフ施工の防護工が地下構造物埋設の本工事と別工事となり、工費、工期が大である。 However, if a pipe roof was first formed as a separate construction, and the underground structure was constructed by excavating under and inside the pipe roof, and this underground structure would be excavated under the pipe roof, this pipe roof exists The amount of soiling increases by the amount of Moreover, the protection work of the pipe roof construction is a separate work from the main construction of underground structure burial, and the construction cost and construction period are large.
かかる不都合を解消するものとして、本発明者等は、下記特許文献に示すように箱形ルーフを圧入後、コンクリート函体を推進させる場合、函体の推進とともに切羽部の土砂を箱形ルーフと一緒に押し出すので、切羽部を掘削する作業を別途必要とせず、コスト削減と工期短縮を図ることができ、また、危険を伴う切羽部の掘削作業を省くことで安全性も向上でき、しかも、函体を推進するための反力抵抗を分散することで、大掛かりな設備を必要としない地下構造物の施工法を出願し、特許権を取得した。
この工法はＳＦＴ工法と名付けられ、下記非特許文献１にも掲載されている。なお、ＳＦＴ工法は、（Simple and Face-Less Method of Construction of Tunnel）は、「シンプルで切羽の無いトンネルの構築工法」の略称である。
ＳＦＴ工法は、第１工程として図２０に示すように鉄道などの上部交通（図示は省略した）の脇に土留鋼矢板２を打設して、発進坑３と到達坑４を築造し、前記発進坑３内に推進機５を設置してこれでルーフ用筒体である箱形ルーフ６を到達坑４に向けて圧入させる。箱形ルーフ６の上面にはフリクションカッタープレート７を載せて置き、箱形ルーフ６とともに押出す。 In the SFT method, as shown in FIG. 20 as the first step, the retaining steel sheet pile 2 is placed beside the upper traffic (not shown) such as a railway to build the start pit 3 and the reach pit 4 The propulsion unit 5 is installed in the start pit 3, and the box-shaped roof 6, which is a roof cylinder, is then pressed into the arrival pit 4. The friction cutter plate 7 is placed on the upper surface of the box-shaped roof 6 and extruded together with the box-shaped roof 6.
箱形ルーフ６は、図２４に示すように矩形断面の箱形筒体であり、側面に鉤状または平板状の継手６ａ，６ｂを長手方向に連続して形成し、また、上面に平板からなるフリクションカッタープレート７を取り付けている。箱形ルーフ６は前後端にボルト接合用のフランジを形成して、長さ方向に順次接続して必要長を埋設することができ、さらに継手６ａ，６ｂを介して縦横方向に連続しながら並列させる。 The box-like roof 6 is a box-like cylinder having a rectangular cross section as shown in FIG. 24. The wedge-like or flat joints 6a and 6b are continuously formed on the side in the longitudinal direction, and The friction cutter plate 7 is attached. The box-like roof 6 is formed with flanges for bolt connection at the front and rear ends, and can be sequentially connected in the length direction to embed the required length, and further parallel connection is continued in the vertical and horizontal directions via the joints 6a and 6b Let
推進機５の詳細図示は省略するが、土砂排土管を押出し体として元押しジャッキで押し出すことにより箱形ルーフ６を掘進させるもので、箱形ルーフ６の先端切羽の掘削は、人力掘削刃口を設けて行なう場合の他、オーガスクリューなどの掘削機構を設けて行なう場合などがある。 Although the detailed illustration of the propulsion unit 5 is omitted, the earth-and-sand discharge pipe is pushed out with a pushing jack as an extrusion body and the box-shaped roof 6 is excavated. There is a case where an excavating mechanism such as an auger screw is provided, in addition to the case of providing the
箱形ルーフ６は推進させようとするコンクリート函体９の外形に対応するように四角形状に配列設置し、箱形ルーフ６の配列で囲まれた切羽部には土留部材１９を配設する。 The box-like roof 6 is arranged in a rectangular shape so as to correspond to the outer shape of the concrete box 9 to be promoted, and the earth retaining member 19 is arranged in the face portion surrounded by the arrangement of the box-like roof 6.
図中１７は腹起こし材、発進坑３側の土留鋼矢板２と到達坑４側の土留鋼矢板２を結合するタイロット材２８で固定する。２０は発進台を示す。 In the figure, 17 is fixed by a tie-lot material 28 which connects the uplifting material, the retained steel sheet pile 2 on the side of the starting pit 3 and the retained steel sheet pile 2 on the side of the reaching pit 4. 20 shows a starting platform.
次に第２工程の図２１に示すようにコンクリート函体９を発進坑３に設置し、コンクリート函体９の後方の反力壁８との間に推進設備として元押しジャッキ１０、ストラット１６、井桁枠２２を配設する。 Next, as shown in FIG. 21 of the second step, the concrete box 9 is installed in the start pit 3 and between the reaction wall 8 and the rear of the concrete box 9, the main push jack 10 and strut 16 The well frame 22 is disposed.
そして、止め部材１４でフリクションカッタープレート７を発進坑３側に固定する。このフリクションカッタープレート７により箱形ルーフ６およびコンクリート函体９と周辺土砂との縁切りを行う。 Then, the friction cutter plate 7 is fixed to the start pit 3 side by the stop member 14. The friction cutter plate 7 cuts off the box roof 6 and the concrete box 9 from the surrounding soil.
次に先行して押出した箱形ルーフ６の後端にコンクリート函体９の先端を接合し、または当接させて、第３工程として図２２に示すように元押しジャッキ１０を伸長してコンクリート函体９を前方に押出す。 Next, the front end of the concrete box 9 is joined or abutted to the rear end of the box-shaped roof 6 that has been extruded in advance, and as shown in FIG. Push the box 9 forward.
コンクリート函体９の押出しと同時に箱形ルーフ６も押出し、さらに切羽部の掘削は行わず、箱形ルーフ６を押出すときに同時に箱形ルーフ６で囲まれた部分に配設した土留部材１９を押出すことによりその前方の土砂も同時に押出す。この場合、前記のようにフリクションカッタープレート７により箱形ルーフ６およびコンクリート函体９と周辺土砂との縁切りがなされているから、箱形ルーフ６およびコンクリート函体９はスムーズに推進する。 A soil retaining member 19 disposed at the same time as extruding the box roof 6 at the same time as extruding the box roof 6 while extruding the box roof 6 simultaneously with the extrusion of the concrete box 9 The soil in front of it is also extruded simultaneously by extruding In this case, since the rim of the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand is made by the friction cutter plate 7 as described above, the box-shaped roof 6 and the concrete box 9 are smoothly propelled.
このようにして第４工程として図２２に示すように箱形ルーフ６とこの箱形ルーフ６に囲まれて同時に押出された土砂が到達坑４に到達したならば、到達坑４で箱形ルーフ６を撤去すると同時に、土砂を掘削して排土する。 Thus, as shown in FIG. 22 as the fourth step, if the soil extruded simultaneously surrounded by the box-shaped roof 6 and the box-shaped roof 6 reaches the reaching pit 4, the box-shaped roof at the reaching pit 4 Remove the soil and excavate the soil at the same time as removing 6.
この撤去は図２５に示すように到達坑４の内部において箱形ルーフ６を解体し、クレーン等で到達坑４の上方に引き上げるとともに、土砂もバックホー等のショベルで、到達坑４の上方に排出する。 As shown in FIG. 25, this removal dismantles the box-like roof 6 inside the reaching pit 4 and pulls it up above the reaching pit 4 with a crane etc., and also discharges the soil above the reaching pit 4 with a shovel such as a backhoe. Do.
そして、さらにコンクリート函体９の先端が到達坑４に達するまで推進してコンクリート函体９の全長の推進が完了する。（図２６参照） Then, the tip end of the concrete box 9 is further propelled until reaching the reaching pit 4 to complete the promotion of the full length of the concrete box 9. (See Figure 26)
前記ＳＦＴ工法においては、到達坑４から箱形ルーフ６を撤去すると同時に、土砂を排土するものであり、到達坑４はそのための作業スペースの広さを確保する大きさを必要とする。 In the SFT method, the box roof 6 is removed from the reaching pit 4 and soil is removed at the same time, and the reaching pit 4 needs to have a size for securing a wide working space therefor.
これら箱形ルーフ６や土砂は、到達坑４の上方の開口から地上に引き上げられて撤去されるので、到達坑４は排出のための開口を備えた大きなものにならざるを得ない。 Since the boxed roof 6 and the soil are pulled up to the ground from the opening above the reaching pit 4 and removed, the reaching pit 4 must be a large one provided with an opening for discharge.
到達側に到達坑４の形成用の用地が充分確保できないときは、周辺環境・条件により到達側において排土ができない場合や到達坑４の長さに制限が生じ、重機が複数台設置できないことや施工ヤードが狭いか、もしくはないことになる。 When sufficient land for formation of the arrival pit 4 can not be secured on the arrival side, if the arrival side can not remove the soil due to the surrounding environment and conditions, or the length of the arrival pit 4 is limited, multiple heavy machinery can not be installed And the construction yard will be narrow or not.
本発明の目的は前記従来例の不都合を解消し、発進坑から到達坑にむけて推進しようとする函体の外形に対応するように箱形ルーフを組み配置して、発進坑もしくは到達坑から地中に圧入した後、この箱形ルーフ端部に函体を配置し、函体の推進とともに箱形ルーフを組み配置した内部の土砂を箱形ルーフといっしょに押し出す地下構造物の施工法において、到達坑を極力小さいものとすることができる地下構造物の施工法を提供することにある。 The object of the present invention is to eliminate the disadvantages of the prior art and construct a box-shaped roof so as to correspond to the outer shape of a box to be propelled from the starting pit to the reaching pit, and After press-in to the ground, a box is placed at the end of the box-like roof, and the construction method of the underground structure which pushes out the earth and sand of the interior where the box-like roof is assembled and arranged together with the box-like roof An object of the present invention is to provide a construction method of an underground structure which can make the reaching pit as small as possible.
前記目的を達成するため請求項１記載の本発明は、発進坑から到達坑にむけて推進しようとする函体の外形に対応するように箱形ルーフを組み配置して、発進坑もしくは到達坑から地中に圧入した後、この箱形ルーフ端部に函体を配置し、函体の推進とともに箱形ルーフを組み配置した内部の土砂を箱形ルーフといっしょに押し出す地下構造物の施工法において、函体を発進坑に設置する前に、箱形ルーフを組み配置した内部の土砂の中に管体を発進坑と到達坑側間に貫通させ、発進坑に設置した函体の推進とともに箱形ルーフ、その内部の土砂および管体を到達側に押し出すとともに、これら到達坑側に押し出す前記箱形ルーフ、土砂、管体は順次解体して、この解体物は管体および函体の内部を発進坑へと搬送し、発進坑から地上に搬出することを要旨とするものである。 In order to achieve the above object, the present invention according to claim 1 is characterized in that the box roof is assembled and arranged to correspond to the outer shape of the box to be propelled from the starting pit to the reaching pit. After pressing into the ground from the ground, a box is placed at the end of this boxy roof, and the construction method of the underground structure that pushes out the earth and sand inside the boxy roof assembled and arranged with the boxy roof together with the promotion of box. Before installing the box in the start pit, the tube is penetrated between the start pit and the reaching pit side in the inner soil in which the box-shaped roof is arranged, and with the promotion of the box set in the start pit The box roof, the earth and sand and the tube inside thereof are pushed out to the arrival side, and the box roof, the earth and sand, and the pipe pushed out to the arrival pit side are dismantled sequentially, Are transported to the start pit and unloaded from the start pit to the ground It is an gist of Rukoto.
請求項１記載の本発明によれば、発進坑から到達坑にむけて推進しようとする函体の外形に対応するように箱形ルーフを組み配置して、発進坑もしくは到達坑から地中に圧入した後、この箱形ルーフ端部に函体を配置し、函体の推進とともに箱形ルーフを組み配置した内部の土砂を箱形ルーフといっしょに押し出す地下構造物の施工法において、到達坑側に押し出す箱形ルーフ、土砂、管体は順次解体して、この解体物は管体および函体の内部を発進坑へと搬送し、発進坑から地上に搬出するので、到達側立坑を小さくできる。 According to the present invention as set forth in claim 1, the box-shaped roof is assembled and arranged to correspond to the outer shape of the box to be propelled from the starting pit to the reaching pit, and from the starting pit or the reaching pit to the ground. After press-fitting, a box is placed at the end of the box-shaped roof, and the construction method of the underground structure in which the earth and sand inside the box-shaped roof are assembled and arranged together with the box-shaped roof is arranged. The boxed roof, soil, and pipe are pushed out to the side, dismantled in order, and the dismantled material is transferred from inside the pipe and the box to the starting pit and carried out from the starting pit to the ground. it can.
さらに、函体の推進とともに箱形ルーフを組み配置した内部の土砂を箱形ルーフといっしょに押し出す場合に、箱形ルーフの矩形配列内方の土砂は管体の推進断面分減少させられているので、多くの土砂を押し出す必要がないので、その分推進もしくはけん引設備を小型にでき、施工の大断面・長延長化にも対応できるものとなる。 Furthermore, when pushing out the earth and sand inside the box-shaped roof assembled and arranged with the box-shaped roof together with the promotion of the box, the earth and sand inside the rectangular array of the box-shaped roof is reduced by the pushing section of the pipe Therefore, since it is not necessary to push out a lot of earth and sand, it is possible to miniaturize the promotion or traction equipment, and to cope with the large cross section and long extension of the construction.
以上述べたように本発明の地下構造物の施工法は、発進坑から到達坑にむけて推進しようとする函体の外形に対応するように箱形ルーフを組み配置して、発進坑もしくは到達坑から地中に圧入した後、この箱型ルーフ端部に函体を配置し、函体の推進とともに箱形ルーフを組み配置した内部の土砂を箱形ルーフといっしょに押し出す地下構造物の施工法において、到達坑を極力小さいものとすることができ、また、押し出す切羽部の土砂を予め減少させることで、推進もしくはけん引設備を小型にでき、施工の大断面・長延長化にも対応できるものである。 As described above, according to the construction method of the underground structure of the present invention, the box roof is assembled and arranged to correspond to the outer shape of the box to be promoted from the starting pit to the reaching pit, and the starting pit or reaching is reached. After press-in from the pit into the ground, place a box at the end of this box-shaped roof, and construct the box-shaped roof with the promotion of the box. In the law, the reach pit can be made as small as possible, and by reducing the earth and sand of the pushing face in advance, the propulsion or traction equipment can be made smaller, and the construction can be coped with the large cross section and long extension. It is a thing.
以下、図面について本発明の実施形態を詳細に説明する。図１〜図１８は本発明の地下構造物の施工法の１実施形態を示す各工程の縦断側面図で、図１９は第３工程の縦断正面図で、前記従来例を示す図２０〜図２７と同一構成要素には同一参照符号を付したものである。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 18 are longitudinal side views of each step showing one embodiment of the construction method of the underground structure of the present invention, and FIG. 19 is a longitudinal sectional front view of the third step, and FIG. The same reference numerals as in FIG.
本発明も従来のＳＦＴ工法と同じように第１工程として図１に示すように鉄道などの上部交通（図示は省略した）の脇にシートパイル等の土留鋼矢板２からなる仮土留杭を打設して、発進坑３と到達坑４を築造し、図２に示すように発進坑３に捨石およびベースコンクリート打設による発進台２０を形成し、推進機（図示せず、図２０参照）を設置してこれで図２に示すようにルーフ用筒体である箱形ルーフ６を到達坑４に向けて圧入させる。 In the present invention, as in the conventional SFT method, as shown in FIG. 1 as a first step, a temporary earth retaining pile consisting of soil retained steel sheet piles 2 such as sheet piles is hit beside the upper traffic (not shown) The start pit 3 and the arrival pit 4 are built, and as shown in FIG. 2, the start pit 20 is formed by putting rubble and base concrete in the start pit 3 and a propulsion unit (not shown, see FIG. 20) The box-shaped roof 6 which is a roof cylinder is then pressed into the reaching pit 4 as shown in FIG.
到達坑４にも同じく捨石およびベースコンクリート打設による到達台２１を形成してある。 The reach pit 4 is also formed with a reach 21 by rubbish and base concrete placement.
箱形ルーフ６は前記従来例と同じく図２４に示すような矩形断面の箱形筒体で、前後端にボルト接合用のフランジを形成して（図示せず）、長さ方向に順次接続して必要長を埋設することができるものである。 The box-shaped roof 6 is a box-shaped cylindrical body having a rectangular cross section as shown in FIG. 24 as in the prior art, and flanges for bolt connection are formed at the front and rear ends (not shown). Necessary length can be buried.
なお、本発明で使用する箱形ルーフ６は側面に鉤状または平板状の継手６ａ，６ｂを長手方向に連続して形成し、また、上面に平板からなるフリクションカッタープレート７を取り付けているものの他、これら継手６ａ，６ｂがなく、また、フリクションカッタープレート７を取り付けていない、単なる矩形管体のものもある。 The box-like roof 6 used in the present invention is formed by continuously forming the wedge-like or flat plate-like joints 6a and 6b in the longitudinal direction on the side and attaching the friction cutter plate 7 consisting of a flat plate on the upper surface In addition, there is also a simple rectangular tube without these joints 6a and 6b and without the friction cutter plate 7 attached.
前記フリクションカッタープレート７は端部を箱形ルーフ６の端部に溶接して一体化しそれ以外は単に載せているだけのものであり、箱形ルーフ６が長さ方向に順次接続してなる場合は、フリクションカッタープレート７自体も相互に溶接などで接続して連続するものとする。 The friction cutter plate 7 is integrally integrated by welding the end to the end of the box-shaped roof 6 and the rest is simply mounted, and the box-shaped roof 6 is sequentially connected in the longitudinal direction. The friction cutter plate 7 itself is also connected to each other by welding or the like.
箱形ルーフ６は推進させようとするコンクリート函体９の外形に対応するように四角形状に配列設置した。この段階では箱形ルーフ６で囲まれた内部には土砂３１が存在する。（図１９参照） The box-like roofs 6 were arranged in a square so as to correspond to the outer shape of the concrete box 9 to be promoted. At this stage, soil 31 exists inside the box-shaped roof 6. (See Figure 19)
次いで、コンクリート函体９を発進坑３に設置する前に、箱型ルーフ６を組み配置した内部の土砂の中を大径の管体２３を順次継ぎ足しながら掘進して発進坑３と到達坑４間に貫通させる。管体２３の内部は空洞となっている。 Next, before installing the concrete box 9 in the start pit 3, the large diameter pipe body 23 is sequentially added to the inside of the earth and sand in which the box-type roof 6 is arranged and excavated to start the start pit 3 and the reaching pit 4. Let it penetrate. The inside of the tube body 23 is hollow.
この管体２３としては鋼管、ヒューム管などの使用が考えられるが、解体を考慮すると鋼管が好適である。また、円筒に限らず、角形なものでもよい。 As this pipe body 23, use of a steel pipe, a fume pipe, etc. can be considered, but in consideration of disassembly, a steel pipe is preferable. Moreover, not only a cylinder but a square thing may be used.
管体２３の掘進は、管体２３を３〜６ｍ程度の単位体として順次接続しながら発進坑３に設置する推進機（図示せず）で推し進め、管体２３の先頭を掘削部２７として管体２３の内部から手掘り、もしくは機械掘りで、土砂は管体２３の内部から発進坑３へと導く。 The pipe 23 is pushed forward by a propulsion unit (not shown) installed in the start pit 3 while sequentially connecting the pipe 23 as a unit of about 3 to 6 m, and the head of the pipe 23 is taken as the excavating part 27 From the inside of the body 23 by hand digging or mechanical digging, the earth and sand are guided from the inside of the pipe body 23 to the start pit 3.
図４に示すようにコンクリート函体９を発進坑３に設置し、コンクリート函体９の後方の反力壁８との間に推進設備として元押しジャッキ１０、ストラット１６、井桁枠２２を配設する。 As shown in FIG. 4, the concrete box 9 is installed in the start pit 3 and the main push jack 10, the struts 16 and the well girder frame 22 are arranged as a propulsion facility between the reaction wall 8 and the rear of the concrete box 9. Do.
そして、止め部材１４でフリクションカッタープレート７を発進坑３側に固定する。このフリクションカッタープレート７により箱形ルーフ６およびコンクリート函体９と周辺土砂との縁切りを行う。 Then, the friction cutter plate 7 is fixed to the start pit 3 side by the stop member 14. The friction cutter plate 7 cuts off the box roof 6 and the concrete box 9 from the surrounding soil.
また、箱形ルーフ６および管体２３を発進坑３と到達坑４間に貫通させるに際して発進坑３と到達坑４を構成する仮土留杭には箱形ルーフ６および管体２３を貫通させるが、箱形ルーフ６で囲まれた内部の仮土留杭の部分はこれを土留部材１９としてそのまま残しておく。 When the boxed roof 6 and the pipe body 23 are to be penetrated between the start pit 3 and the arrival pit 4, the box roof 6 and the pipe body 23 are made to penetrate through temporary earth retaining piles constituting the start pit 3 and the arrival pit 4. The portion of the temporary earth retaining pile surrounded by the box-shaped roof 6 is left as the earth retaining member 19 as it is.
次に先行して押出した箱形ルーフ６の後端にコンクリート函体９の先端を接合し、または当接させて、第５工程として図５に示すように元押しジャッキ１０を伸長してコンクリート函体９を前方に押出す。 Next, the front end of the concrete box 9 is joined to or brought into contact with the rear end of the box-shaped roof 6 that has been extruded in advance, and as shown in FIG. Push the box 9 forward.
コンクリート函体９の押出しと同時に箱形ルーフ６も押出し、さらに切羽部の掘削は行わず、箱形ルーフ６を押出すときに同時に箱形ルーフ６で囲まれた部分に配設した土留部材１９を押出すことにより箱形ルーフ６で囲まれた内部の土砂３１や管体２３も同時に押出す。 A soil retaining member 19 disposed at the same time as extruding the box roof 6 at the same time as extruding the box roof 6 while extruding the box roof 6 simultaneously with the extrusion of the concrete box 9 By simultaneously extruding the inside soil 31 and the tube 23 surrounded by the box-shaped roof 6.
この場合、前記のようにフリクションカッタープレート７により箱形ルーフ６およびコンクリート函体９と周辺土砂との縁切りがなされているから、箱形ルーフ６およびコンクリート函体９はスムーズに推進する。 In this case, since the rim of the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand is made by the friction cutter plate 7 as described above, the box-shaped roof 6 and the concrete box 9 are smoothly propelled.
このようにして第６工程として図６に示すように箱形ルーフ６とこの箱形ルーフ６に囲まれて同時に押出された土砂３１が到達坑４に到達したならば、到達坑４で箱形ルーフ６をピース毎に分解し、撤去すると同時に、土砂３１を掘削して排土する。 Thus, as shown in FIG. 6 as the sixth step, if the soil 31 which is simultaneously and enclosed by the box-shaped roof 6 and the box-shaped roof 6 reaches the reaching pit 4, the box type of the reaching pit 4 is formed. The roof 6 is disassembled piece by piece and, at the same time, the earth and sand 31 is excavated and discharged.
また、押し出される管体２３の先頭部も溶断等で小片に分断し、これも撤去する。 Further, the leading end of the extruded tubular body 23 is also divided into small pieces by melting and the like, and this is also removed.
前記土留部材１９も撤去する。 The soil retaining member 19 is also removed.
図中３２は到達坑４に設置したホイストであるが、ピース毎に分解した箱形ルーフ６や掘削した土砂３１、分断した土留部材１９や管体２３はホイスト３２で一時的に保持し、管体２３の内部に導き、管体２３の内部および函体９の内部を発進坑３へと搬送し、発進坑３から地上に搬出する。 In the figure, 32 is a hoist installed in the reaching pit 4, but the box-shaped roof 6 disassembled into pieces and excavated soil 31 and divided soil retaining members 19 and tubes 23 are temporarily held by the hoist 32 and pipes It is led to the inside of the body 23, and the inside of the tubular body 23 and the inside of the box 9 are transported to the start pit 3 and carried out of the start pit 3 to the ground.
図７に示すように、台車３３を用いて搬送することができる。 As shown in FIG. 7, the carriage 33 can be used to carry.
以上のように到達坑４側に押し出す前記箱形ルーフ６、土砂３１、管体２３は順次解体して、この解体物は管体および函体の内部を発進坑へと搬送し、発進坑３から地上に搬出する。 As described above, the boxed roof 6, the soil 31, and the pipe 23 which are pushed to the reaching pit 4 side are dismantled in order, and the dismantled material is transported to the starting pit from the inside of the pipe and the box. Take it out to the ground.
して、さらにコンクリート函体９の先端が到達坑４に達するまで推進してコンクリート函体９の全長の推進が完了する。 Then, the propelling of the full length of the concrete box 9 is completed by propelling until the tip of the concrete box 9 reaches the reaching pit 4.
２ 土留鋼矢板
３ 発進坑 ４ 到達坑
５ 推進機 ６ 箱形ルーフ
６ａ，６ｂ 平板状の継手 ７ フリクションカッタープレート
８ 反力壁 ９ コンクリート函体
１０ 元押しジャッキ １１ 刃口
１２ 小ジャッキ １３ 支持材
１４ 止め部材 １５ 受台
１６ ストラット １７ 腹起こし材
１８ 函体接続工 １９ 土留部材
２０ 発進台 ２１ 到達台
２２ 井桁枠 ２３ 管体
２４ 土砂 ２５ 土留部材
２６ 発進台 ２７ 掘削部
２８ タイロット材 ２９ リフター
３０ 押角 ３１ 土砂
３２ ホイスト ３３ 台車
DESCRIPTION OF SYMBOLS 2 Soil retaining steel sheet pile 3 Starting pit 4 Reaching pit 5 Propulsion machine 6 Box-shaped roof 6a, 6b Flat joint 7 Friction cutter plate 8 Reaction wall 9 Concrete box 10 Original push jack 11 Cutting edge 12 Small jack 13 Support 14 Retaining members 15 pedestals 16 struts 17 uplifting members 18 box connection work 19 soil retention members 20 starting platforms 21 arrival platforms 22 well girder frames 23 pipes 24 sediments 25 soil retaining members 26 launch platforms 27 excavating sections 28 tie-lot materials 29 lifters 30 pushing angle 31 Earth and sand 32 Hoist 33 Bogie
Claims (1)
函体を発進坑に設置する前に、箱形ルーフを組み配置した内部土砂の中に管体を発進坑と到達坑側間に貫通させ、発進坑に設置した函体の推進とともに箱形ルーフ、その内部の土砂および管体を到達側に押し出すとともに、これら到達坑側に押し出す前記箱形ルーフ、土砂、管体は順次解体して、この解体物は管体および函体の内部を発進坑へと搬送し、発進坑から地上に搬出することを特徴とした地下構造物の施工法。 The boxed roof is assembled so as to correspond to the outer shape of the box to be propelled from the starting pit to the reaching pit, and pressed into the ground from the starting pit or the reaching pit, In the construction method of the underground structure which arranges the box body and pushes out the earth and sand inside the box roof assembled and arranged with the box roof together with the promotion of the box,
Before installing the box in the start pit, the tube is penetrated between the start pit and the arrival pit side in the inside soil where the box roof is assembled and arranged, and the box roof is promoted along with the promotion of the box placed in the start pit While pushing out the earth and sand and the tube inside of the box roof, the earth and sand, and the tube pushing out to the reaching side, dismantling products are dismantled in order, and the dismantling material starts the inside of the tube and box. Underground construction method characterized by carrying to the ground and carrying it out from the starting pit to the ground.
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