JP6445478B2 - Construction method for underground structures - Google Patents

Construction method for underground structures Download PDF

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JP6445478B2
JP6445478B2 JP2016031703A JP2016031703A JP6445478B2 JP 6445478 B2 JP6445478 B2 JP 6445478B2 JP 2016031703 A JP2016031703 A JP 2016031703A JP 2016031703 A JP2016031703 A JP 2016031703A JP 6445478 B2 JP6445478 B2 JP 6445478B2
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roof
construction method
underground structure
shaped roof
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JP2017150175A (en
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植村　誠
誠 植村
賢治郎 植村
賢治郎 植村
公博 坂
公博 坂
康彦 山下
康彦 山下
文唯 安部
文唯 安部
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植村　誠
誠 植村
賢治郎 植村
賢治郎 植村
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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 method for constructing an underground structure that can be constructed without hindering the upper traffic when excavating and constructing a significant underground structure 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、鋼管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 excavate a large number of underground structures in the lower ground such as railroads and roads in the transverse direction, a protective work is required to support the upper traffic, and a pipe roof that horizontally aligns steel pipes, etc. is provided. Can be given.

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たり、また地下構造物をパイプルーフ下を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 an underground structure was constructed by excavating the bottom or inside of the pipe roof, or the underground structure was advanced under the pipe roof, this pipe roof would be The earth covering becomes thick as much as it exists. Moreover, the protective work for pipe roof construction is separate from the main construction for 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。
特許第４１３４０８９号公報 特許第４３１７８４３号公報 In order to eliminate such inconvenience, the present inventors, as shown in the following patent document, press the box-shaped roof and then propel the concrete box. Because it extrudes together, it does not require additional work to excavate the face part, can reduce costs and shorten the work period, and can also improve safety by omitting the face part excavation that involves danger, By distributing the reaction force resistance for propelling the box, we applied for a construction method for an underground structure that does not require large-scale equipment, and obtained a patent.
Japanese Patent No. 4134089 Japanese Patent No. 4317843

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。
特許第３８８７３８３号公報 In order to eliminate such inconvenience, the present inventors, as shown in the following patent document, press the box-shaped roof and then propel the concrete box. Because it extrudes together, it does not require additional work to excavate the face part, can reduce costs and shorten the work period, and can also improve safety by omitting the face part excavation that involves danger, By distributing the reaction force resistance for propelling the box, we applied for a construction method for an underground structure that does not require large-scale equipment, and obtained a patent.
Japanese Patent No. 3887383

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。
インターネットウエブサイトの植村技研工業株式会社のホームページ http://www.uemuragiken.co.jp/tech/sft.html This construction method is named SFT construction method and is also published in Non-Patent Document 1 below. Note that the SFT method (Simple and Face-Less Method of Construction of Tunnel) is an abbreviation for “construction method of a tunnel that is simple and has no face”.
Homepage of Uemura Giken Kogyo Co., Ltd., an internet website http://www.uemuragiken.co.jp/tech/sft.html

ＳＦＴ工法は、第１工程として図３７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。   As shown in FIG. 37, the SFT method is constructed by placing a steel retaining sheet pile 2 on the side of upper traffic (not shown) such as a railroad as shown in FIG. The propulsion device 5 is installed in the start pit 3, and the box-shaped roof 6, which is a roof cylinder, is press-fitted toward the arrival pit 4. A 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４１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。   As shown in FIG. 41, the box-shaped roof 6 is a box-shaped cylinder having a rectangular cross section, and is formed with bowl-shaped or flat-plate joints 6a and 6b continuously in the longitudinal direction on the side surface, and from the flat plate on the upper surface. A friction cutter plate 7 is attached. The box-shaped roof 6 has flanges for bolting at the front and rear ends and can be sequentially connected in the length direction to embed the required length, and further parallel 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 device 5 is omitted, the box roof 6 is dug out by pushing out the earth and sand discharge pipe with the main push jack as an extruded body. In addition to the case where a drilling mechanism such as an auger screw is provided.

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-shaped roof 6 is arranged in a quadrangular shape so as to correspond to the outer shape of the concrete box 9 to be propelled, and a earth retaining member 19 is disposed on the face portion surrounded by the arrangement of the box-shaped 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, reference numeral 17 denotes a bellows material, which is fixed by a tie-lot material 28 that joins the retaining steel sheet pile 2 on the start pit 3 side and the retaining steel sheet pile 2 on the arrival mine 4 side. Reference numeral 20 denotes a starting stand.

次に第２工程の図３８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. 38 in the second step, the concrete box 9 is installed in the start pit 3, and a push jack 10, strut 16, A well girder frame 22 is provided.

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 shaft 3 side by the stop member 14. The friction cutter plate 7 cuts the box roof 6 and the concrete box 9 and the surrounding earth and sand.

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３９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 leading end of the concrete box 9 is joined or brought into contact with the rear end of the box-shaped roof 6 extruded in advance, and the main jack 10 is extended as shown in FIG. The box 9 is pushed 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。   Simultaneously with the extrusion of the concrete box 9, the box-shaped roof 6 is also extruded, and the face portion is not excavated. When the box-shaped roof 6 is extruded, the earth retaining member 19 disposed at the portion surrounded by the box-shaped roof 6 at the same time. The soil in front of it is also extruded at the same time. In this case, since the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand are cut by the friction cutter plate 7 as described above, the box-shaped roof 6 and the concrete box 9 are smoothly driven.

このようにして第４工程として図４０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。   In this way, as shown in FIG. 40, as the fourth step, if the box-shaped roof 6 and the earth and sand that are simultaneously pushed and surrounded by the box-shaped roof 6 reach the access shaft 4, the box-shaped roof is formed at the access shaft 4. At the same time as 6 is removed, the soil is excavated and discharged.

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。   Further, the concrete box 9 is further propelled until the tip of the concrete box 9 reaches the reaching pit 4, and the propulsion of the full length of the concrete box 9 is completed.

前記従来のＳＦＴ工法では、箱形ルーフ６で閉合した横断部地山を一体化して押し抜き、本設であるコンクリート函体９と置換するもので、箱形ルーフとその内部の地山をコンクリート函体９とともに押し出すので、その推進のための力はかなりのものとなる。   In the conventional SFT method, the cross section natural ground closed by the box-shaped roof 6 is integrated and punched out to replace the concrete box 9 which is the main construction. Since it is pushed out together with the box 9, the force for its propulsion becomes considerable.

特に施工の大断面・長延長化があるとこれにともない推進・けん引設備も大規模となり、工事費の増大あるいは状況によってはＳＦＴ工法では施工不能となるケースがあった。   In particular, if the construction has a large cross-section and lengthening, the propulsion and towing equipment becomes large-scale, and there are cases in which construction work cannot be performed by the SFT method depending on the increase in construction cost or the situation.

本発明の目的は前記従来例の不都合を解消し、箱形ルーフを圧入後、コンクリート函体を推進させるのに、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だす地下構造物の施工法（ＳＦＴ工法）に改良を加え、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 solve the inconvenience of the conventional example, and to press the box-shaped roof and then push the concrete box to push the earth and sand of the face part together with the box-shaped roof while pushing the box. By improving the construction method (SFT method) of the structure and reducing the amount of sand and sand in the face to be pushed out in advance, the propulsion or towing equipment can be reduced in size, and the construction of underground structures that can accommodate large sections and lengthening of construction It is to provide a construction method.

前記目的を達成するため本発明は、推進しようとするコンクリート函体の外形に対応するように箱形ルーフを下段、側部及び上段の矩形配列に組み配置して、地中に圧入した後、前記箱形ルーフ端部に函体の先端部を合わせて函体を配置して函体の推進や牽引とともに箱形ルーフの矩形配列と一緒に押し出す地下構造物の施工法において、箱形ルーフの矩形配列の内方に箱形ルーフまたはパイプルーフを地中に圧入により配列設置し、コンクリート函体の推進や牽引と同時に箱形ルーフを押出す際に箱形ルーフの矩形配列の内方の土砂を前記配列設置する箱形ルーフまたはパイプルーフの推進断面分減少させておくことを要旨とするものである。   In order to achieve the above-mentioned object, the present invention is to arrange box-shaped roofs in a rectangular arrangement of the lower stage, the side part and the upper stage so as to correspond to the outer shape of the concrete box to be propelled, and press-fit into the ground. In the construction method of an underground structure in which the box body is aligned with the tip of the box roof and the box is pushed and pushed together with the rectangular array of box roofs along with the box propulsion and traction, Box roofs or pipe roofs are placed inside the rectangular array by press-fitting into the ground, and when the box roof is pushed out simultaneously with propulsion and traction of the concrete box, the inner soil of the rectangular array of the box roof The gist of the invention is to reduce the propulsion cross section of the box roof or pipe roof to be arranged and installed.

本発明によれば、コンクリート函体の推進や牽引とともに箱形ルーフの矩形配列と一緒に押し出す場合に、箱形ルーフの矩形配列の内方の土砂は箱形ルーフまたはパイプルーフ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。   According to the present invention, when the concrete box is pushed out together with the rectangular arrangement of the box roof together with the propulsion and traction of the concrete box, the inner earth and sand of the rectangular arrangement of the box roof is reduced by the propulsion cross section of the box roof or pipe roof. Therefore, it is not necessary to extrude a lot of earth and sand, so that the propulsion or towing equipment can be reduced in size, and the construction can be adapted to a large cross section and lengthening.

以上述べたように本発明の地下構造物の施工法は、箱形ルーフを圧入後、コンクリート函体を推進させるのに、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だす地下構造物の施工法（ＳＦＴ工法）に改良を加え、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, after pressing the box-shaped roof, the concrete box is pushed forward, and the earth and sand at the face part is pushed out together with the box-shaped roof as the box is pushed. By improving the construction method of the underground structure (SFT method) and reducing the earth and sand of the face to be pushed out in advance, the propulsion or towing equipment can be made smaller, and it can be used for large sections and lengthening construction. is there.

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９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、図１０〜図１８は同上縦断側面図で、前記従来例を示す図３０〜図３５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 9 are longitudinal side views of each process showing one embodiment of the construction method of the underground structure of the present invention, and FIGS. 10 to 18 are longitudinal side views of the same as above, and FIGS. The same components are denoted by the same reference numerals.

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からなる仮土留杭２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３１参照）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, a temporary earth retaining pile 2 made of earth retaining steel sheet piles such as a sheet pile is placed on the side of an upper traffic such as a railway (not shown) as shown in FIG. The start pit 3 and the arrival pit 4 are constructed, and as shown in FIG. 2, the start pit 20 is formed in the start pit 3 by rubble and base concrete placement, and a propulsion unit (not shown, see FIG. 31) As shown in FIG. 2, the box-shaped roof 6, which is a roof cylinder, is press-fitted toward the access shaft 4.

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。   Similarly, the arrival pit 4 is formed with rubble and base concrete placement.

箱形ルーフ６は前記従来例と同じく図３５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. 35 as in the conventional example, and is formed with bolting flanges at the front and rear ends (not shown) and sequentially connected in the length direction. The 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、単なる矩形鋼管のものもある。   The box-shaped roof 6 used in the present invention has a flange-like or flat-plate joint 6a, 6b formed continuously in the longitudinal direction on the side surface, and a friction cutter plate 7 made of a flat plate attached to the upper surface. In addition, there is a simple rectangular steel pipe 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 integrated by welding the end part to the end part of the box-shaped roof 6, and the other parts are simply placed, and the box-shaped roof 6 is sequentially connected in the length direction. The friction cutter plates 7 themselves are continuously connected to each other by welding or the like.

圧入させる箱形ルーフ６は図１１に示すように最下段のものとして横一列に配列させ、外側に位置する箱形ルーフ６は側面とした下面に、また、中に位置する箱形ルーフ６は下面に鋼製板によるフリクションカッタープレート７を重ねて配置した。箱形ルーフ６の横一列の配列幅は設置しようとするコンクリート函体５（図１５参照）の横幅に合致させる。   As shown in FIG. 11, the box roofs 6 to be press-fitted are arranged in a horizontal row as the lowermost one, and the box roofs 6 located on the outer side are arranged on the bottom surface, and the box roofs 6 located on the inside are A friction cutter plate 7 made of a steel plate was placed on the lower surface. The arrangement width of the horizontal row of the box-shaped roof 6 is matched with the horizontal width of the concrete box 5 (see FIG. 15) to be installed.

次いで、図３、図１２に示すように最下段から次の段のものとして箱形ルーフ６を圧入して横一列に配列させて積み上げ、図４、図１３に示すように同様に第３段目を横一列に配列させて積み上げ、図５、図１４に示すように同様に第４段目を圧入して横一列に配列させて積み上げた。   Next, as shown in FIGS. 3 and 12, the box roofs 6 are press-fitted from the bottom to the next, and are arranged in a horizontal row and stacked, and the third stage is similarly formed as shown in FIGS. The eyes were arranged in a horizontal row and stacked, and similarly, as shown in FIGS. 5 and 14, the fourth stage was press-fitted and arranged in a horizontal row.

前記図３、図１２に示す第２段目、図４、図１３に示す第３段目では外側に位置する箱形ルーフ６には外側側面にフリクションカッタープレート７を重ねて配置し、図５、図１４に示す第４段目（最上段）に位置する箱形ルーフ６では外側に位置する箱形ルーフ６には外側側面の他に、上面にも、中側に位置する箱形ルーフ６では上面に重ねて配置する。   In the second stage shown in FIGS. 3 and 12, and in the third stage shown in FIGS. 4 and 13, a friction cutter plate 7 is arranged on the outer side surface of the box-shaped roof 6 positioned on the outer side. 14, the box-shaped roof 6 positioned at the fourth level (the uppermost level) has a box-shaped roof 6 positioned at the inner side as well as at the upper side in addition to the outer side surface. Then, it arranges on the upper surface.

このようにしてフリクションカッタープレート１４を重ねてある箱形ルーフ６は発進坑３から到達坑４へと圧入させ、推進し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箱形ルーフ６を下段、側部及び上段の矩形配列に組み配置する。   The box-shaped roof 6 on which the friction cutter plates 14 are overlapped in this manner is press-fitted from the start pit 3 to the arrival pit 4, and the box-shaped roof 6 is lowered to correspond to the outer shape of the concrete box 9 to be propelled. , Arranged in a rectangular arrangement on the side and top.

また、前記箱形ルーフ６の矩形配列の内方に箱形ルーフ６を地中に圧入により配列設置することで、この箱形ルーフ６の推進断面分の土砂を中抜きしておく。   Moreover, the box-shaped roof 6 is placed inside the rectangular array of the box-shaped roof 6 by press-fitting into the ground, so that the earth and sand for the cross section of the box-shaped roof 6 is removed.

なお、図示の例では前記箱形ルーフ６の矩形配列の内方に配置する箱形ルーフ６は相互に隙間を設けることなく密に並べたが、これに限定されるものでなく、間隔を存して少ない本数を配置してもよい。   In the illustrated example, the box roofs 6 arranged inward of the rectangular array of the box roofs 6 are arranged closely without providing any gaps between them, but the present invention is not limited to this, and there is an interval. And you may arrange | position a small number.

また、箱形ルーフ６の配列設置手順も前記横一列に順次積み上げていったが、これは安定性には富むがこれに限定されるものでなく、横一列に順次積み下げていく方法や、先に縦列に配列し、これを横に広げていく方法など種々選択でき、特に限定されるものではない。   In addition, the array installation procedure of the box-shaped roof 6 was also sequentially stacked in the horizontal row, but this is not limited to this, although it is rich in stability. Various arrangements such as a method of arranging them in a column first and spreading them horizontally can be selected and are not particularly limited.

図６に示すように発進坑３で発進台２０に設置するコンクリート函体９の先端と土中配列された箱形ルーフ６の端を合致させ、また、発進坑３の反力壁８の前に井桁枠２２を設けて元押しジャッキ１０を設置し、これをコンクリート函体９の後端に当接させる。   As shown in FIG. 6, the end of the concrete box 9 installed on the start stand 20 in the start pit 3 is matched with the end of the box roof 6 arranged in the soil, and in front of the reaction wall 8 of the start pit 3. A cross-girder frame 22 is provided to the main push jack 10, and this is brought into contact with the rear end of the concrete box 9.

なお、コンクリート函体９の前端には函体接続工１８としてのＨ型鋼材による押角を取り付ける。   In addition, the pushing angle by the H-shaped steel material as the box connection work 18 is attached to the front end of the concrete box 9.

前記フリクションカッタープレート７は箱形ルーフ６とは端部の結合を解除し（溶接固定を解除する）、仮土留杭２と固定するようにする。   The friction cutter plate 7 is fixed to the temporary earth retaining pile 2 by releasing the connection of the end with the box-shaped roof 6 (release welding fixing).

図７に示すように箱形ルーフ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、元押しジャッキ１０でコンクリート函体９を箱形ルーフ６ともどもに押し出す。図中１６は押し出しの際に使用するストラットである。   As shown in FIG. 7, the front end of the concrete box 9 is joined or brought into contact with the rear end of the box-shaped roof 6, and the concrete box 9 is pushed out together with the box-shaped roof 6 by the main push jack 10. In the figure, 16 is a strut used for extrusion.

なお、コンクリート函体９は推進させる場合の他、牽引させることもできる。牽引は、函体の前方反力壁を設け、函体の後部に定着装置または牽引ジャッキを取り付け、この定着装置または牽引ジャッキに一端を取り付けた牽引ケーブルの他端を、反力壁に固定した牽引ジャッキまたは定着装置に定着し、牽引ジャッキの牽引で行う。コンクリート函体５の推進や牽引は、いずれか一方を、もしくは、推進と牽引の両方を併用して行ってもよい。   The concrete box 9 can be pulled as well as being propelled. Towing, the front reaction force wall of the box is provided, a fixing device or a traction jack is attached to the rear of the box, and the other end of the traction cable with one end attached to the fixing device or the traction jack is fixed to the reaction force wall. Fix to the tow jack or fixing device and pull the tow jack. Propulsion and traction of the concrete box 5 may be performed using either one or both of the propulsion and traction.

このようにコンクリート函体９は、推進や牽引させるものであり、コンクリート函体９の推進や牽引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を押出すときに箱形ルーフ６の相互間に土砂がない場合はそのまま、また、土砂がある場合はこの土砂も箱形ルーフ６と共に到達坑４に押し出される。   In this way, the concrete box 9 is propelled and towed, and the box-shaped roof 6 is extruded simultaneously with the propulsion and towing of the concrete box 9, and the box-shaped roof 6 is pushed out without excavating the face portion. Sometimes, when there is no earth and sand between the box-shaped roofs 6, the earth and sand are pushed out together with the box-shaped roof 6 to the reaching pit 4.

また、箱形ルーフ６に重ねたフリクションカッタープレート７はコンクリート函体９の推進や牽引と同時に箱形ルーフ６を押出す際に坑口付近に端部を止め、これを残置することで、箱形ルーフ６やコンクリート函体９と地山との縁切りを行うことができる。   Further, the friction cutter plate 7 superimposed on the box-shaped roof 6 is stopped at the end near the wellhead when the box-shaped roof 6 is pushed out at the same time as the concrete box 9 is propelled or pulled, and is left in the box shape. The roof 6 or the concrete box 9 and the natural ground can be cut.

このようにして箱形ルーフ６が到達坑４に到達したならば、到達坑４で箱形ルーフ６を分割して順次撤去する。   When the box-shaped roof 6 reaches the reaching pit 4 in this manner, the box-shaped roof 6 is divided at the reaching pit 4 and sequentially removed.

図１７、図１８はコンクリート函体５の圧入が完了し、コンクリート函体５を設置した段階である。   17 and 18 show the stage where the press fitting of the concrete box 5 is completed and the concrete box 5 is installed.

前記実施形態は箱形ルーフ６の矩形配列の内方に箱形ルーフ６を密に配置し、箱形ルーフ６間に土砂が全く介在しない例を説明したが、箱形ルーフ６の矩形配列の内方に配置する箱形ルーフ６相互間を間隔を存してその間に土砂が介在する場合はこの土砂も箱形ルーフ６とともに到達坑４へ押し抜き、箱形ルーフ６の撤去とともにこれも撤去する。   In the above embodiment, the box roofs 6 are arranged densely inside the rectangular array of the box roofs 6 and no earth or sand is interposed between the box roofs 6. When there is a gap between the box roofs 6 arranged inward and earth and sand are interposed between them, the earth and sand are also pushed out together with the box roof 6 to the access pit 4 and removed together with the removal of the box roof 6. To do.

図１９〜図２７、図２８〜図３６は本発明の第２実施例を示すもので、推進し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箱形ルーフ６を下段、側部及び上段の矩形配列に組み配置して、地中に圧入した後、前記箱形ルーフ６の端部に函体の先端部を合わせてコンクリート函体９を配置して函体の推進や牽引とともに箱形ルーフ６の矩形配列と一緒に押し出す地下構造物の施工法において、箱形ルーフ６の矩形配列の内方には前記第１実施形態の箱形ルーフ６に代えて円形鋼管であるパイプルーフ２３を地中に圧入により配列設置し、コンクリート函体９の推進や牽引と同時に箱形ルーフ６を押出す際に箱形ルーフ６の矩形配列の内方の土砂を前記配列設置するパイプルーフ２３の推進断面分減少させておく。   FIGS. 19 to 27 and FIGS. 28 to 36 show a second embodiment of the present invention. The box-shaped roof 6 is arranged at the lower, side and upper stages so as to correspond to the outer shape of the concrete box 9 to be propelled. After being pressed into the ground, the concrete box 9 is placed by aligning the tip of the box with the end of the box-shaped roof 6, and the box is formed along with the propulsion and traction of the box. In the construction method of the underground structure extruded together with the rectangular array of the roof 6, a pipe roof 23 which is a circular steel pipe is provided inside the rectangular array of the box-shaped roof 6 instead of the box-shaped roof 6 of the first embodiment. When the concrete box 9 is pushed and inserted into the ground, and the box roof 6 is pushed out at the same time as the concrete box 9 is pushed and pulled, the inner side of the rectangular roof 6 is pushed and the pipe roof 23 is pushed. Reduce the cross section.

パイプルーフ２３の圧入は箱形ルーフ６の圧入と同様の方法で行うことができる。   The press fitting of the pipe roof 23 can be performed by the same method as the press fitting of the box roof 6.

図示の実施形態ではパイプルーフ２３は相互に間隔を存して配列し、パイプルーフ２３間には土砂２４が存在する。   In the illustrated embodiment, the pipe roofs 23 are arranged with a space therebetween, and earth and sand 24 exist between the pipe roofs 23.

図２３、図２４に示すように箱形ルーフ６およびパイプルーフ２３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、元押しジャッキ１０でコンクリート函体９を箱形ルーフ６およびパイプルーフ２３と土砂２４ともどもに押し出す。   As shown in FIGS. 23 and 24, the ends of the concrete box 9 are joined or brought into contact with the rear ends of the box-shaped roof 6 and the pipe roof 23, and the concrete box 9 is attached to the box-shaped roof 6 with the push jack 10. The pipe roof 23 and the earth and sand 24 are extruded together.

なお、箱形ルーフ６で囲まれた切羽部には土留部材２５を配設し、これで土砂２４を押えながら箱形ルーフ６やパイプルーフ２３といっしょに押し出すが、この土留部材２５は仮土留杭２を鏡開きして箱形ルーフ６で囲まれた内方の鋼矢板を利用することができる。   In addition, a retaining member 25 is disposed at the face surrounded by the box-shaped roof 6 and is pushed out together with the box-shaped roof 6 and the pipe roof 23 while holding the earth and sand 24. The retaining member 25 is a temporary retaining ring. An inner steel sheet pile surrounded by a box roof 6 can be used by mirror-opening the pile 2.

このようにして箱形ルーフ６、パイプルーフ２３が到達坑４に到達したならば、到達坑４で箱形ルーフ６を分割し、また、パイプルーフ２３を適宜切断して、土砂２４とともに順次撤去する。   When the box-shaped roof 6 and the pipe roof 23 reach the access shaft 4 in this way, the box-shaped roof 6 is divided at the access shaft 4, and the pipe roof 23 is appropriately cut and removed together with the earth and sand 24. To do.

本発明の地下構造物の施工法の第１実施形態を示す第１工程の縦断側面図である。It is a vertical side view of the 1st process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第２工程の縦断側面図である。It is a vertical side view of the 2nd process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第３工程の縦断側面図である。It is a vertical side view of the 3rd process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第４工程の縦断側面図である。It is a vertical side view of the 4th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第５工程の縦断側面図である。It is a vertical side view of the 5th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第６工程の縦断側面図である。It is a vertical side view of the 6th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第７工程の縦断側面図である。It is a vertical side view of the 7th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第８工程の縦断側面図である。It is a vertical side view of the 8th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第９工程の縦断側面図である。It is a vertical side view of the 9th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第１工程の縦断正面図である。It is a vertical front view of the 1st process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第２工程の縦断正面図である。It is a vertical front view of the 2nd process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第３工程の縦断正面図である。It is a vertical front view of the 3rd process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第４工程の縦断正面図である。It is a vertical front view of the 4th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第５工程の縦断正面図である。It is a vertical front view of the 5th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第６工程の縦断正面図で、図６のＡ−Ａ線、Ｂ−Ｂ線断面図である。It is a vertical front view of the 6th process which shows 1st Embodiment of the construction method of the underground structure of this invention, and is the AA line of FIG. 6, BB sectional drawing. 本発明の地下構造物の施工法の第１実施形態を示す第７工程の縦断正面図である。It is a vertical front view of the 7th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第８工程の縦断正面図である。It is a vertical front view of the 8th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第１実施形態を示す第９工程の縦断正面図である。It is a vertical front view of the 9th process which shows 1st Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第１工程の縦断側面図である。It is a vertical side view of the 1st process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第２工程の縦断側面図である。It is a vertical side view of the 2nd process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第３工程の縦断側面図である。It is a vertical side view of the 3rd process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第４工程の縦断側面図である。It is a vertical side view of the 4th process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第５工程の縦断側面図である。It is a vertical side view of the 5th process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第６工程の縦断側面図である。It is a vertical side view of the 6th process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第７工程の縦断側面図である。It is a vertical side view of the 7th process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第８工程の縦断側面図である。It is a vertical side view of the 8th process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第９工程の縦断側面図である。It is a vertical side view of the 9th process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第１工程の縦断正面図である。It is a vertical front view of the 1st process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第２工程の縦断正面図である。It is a vertical front view of the 2nd process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の第２実施形態を示す第３工程の縦断正面図である。It is a vertical front view of the 3rd process which shows 2nd Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の１実施形態を示す第４工程の縦断正面図で、図２２のＡ−Ａ線、Ｂ−Ｂ線断面図である。It is a vertical front view of the 4th process which shows one Embodiment of the construction method of the underground structure of this invention, and is the sectional view on the AA line of FIG. 本発明の地下構造物の施工法の１実施形態を示す第５工程の縦断正面図である。It is a vertical front view of the 5th process which shows one Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の１実施形態を示す第６工程の縦断正面図である。It is a vertical front view of the 6th process which shows one Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の１実施形態を示す第７工程の縦断正面図である。It is a vertical front view of the 7th process which shows one Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の１実施形態を示す第８工程の縦断正面図である。It is a vertical front view of the 8th process which shows one Embodiment of the construction method of the underground structure of this invention. 本発明の地下構造物の施工法の１実施形態を示す第９工程の縦断正面図である。It is a vertical front view of the 9th process which shows one Embodiment of the construction method of the underground structure of this invention. 従来の地下構造物の施工法の第１工程を示す縦断側面図である。It is a vertical side view which shows the 1st process of the construction method of the conventional underground structure. 従来の地下構造物の施工法の第２工程を示す縦断側面図である。It is a vertical side view which shows the 2nd process of the construction method of the conventional underground structure. 従来の地下構造物の施工法の第３工程を示す縦断側面図である。It is a vertical side view which shows the 3rd process of the construction method of the conventional underground structure. 従来の地下構造物の施工法の第３工程を示す縦断側面図である。It is a vertical side view which shows the 3rd process of the construction method of the conventional underground structure. 箱形ルーフの正面図である。It is a front view of a box-shaped roof.

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 パイプルーフ
２４ 土砂 ２５ 土留部材
２８ タイロット材 2 Steel retaining sheet pile 3 Start pit 4 Arrival pit 5 Propulsion machine 6 Box-shaped roof 6a, 6b Flat joint 7 Friction cutter plate 8 Reaction wall 9 Concrete box 10 Original jack 11 Cutting edge 12 Small jack 13 Support material 14 Stopping member 15 Receiving base 16 Strut 17 Waist raising member 18 Box connecting work 19 Earth retaining member 20 Starting base 21 Arrival base 22 Cross girder frame 23 Pipe roof 24 Earth and sand 25 Earth retaining member 28 Tylot material

Claims (2)

推進しようとするコンクリート函体の外形に対応するように箱形ルーフを下段、側部及び上段の矩形配列に組み配置して、地中に圧入した後、前記箱形ルーフ端部に函体の先端部を合わせて函体を配置して函体の推進や牽引とともに箱形ルーフの矩形配列と一緒に押し出す地下構造物の施工法において、
箱形ルーフの矩形配列の内方に箱形ルーフを地中に圧入により配列設置し、
コンクリート函体の推進や牽引と同時に箱形ルーフを押出す際に箱形ルーフの矩形配列の内方の土砂を前記配列設置する箱形ルーフの推進断面分減少させておくことを特徴とする地下構造物の施工法。 The box-shaped roof is assembled and arranged in a rectangular arrangement of the lower, side, and upper stages so as to correspond to the outer shape of the concrete box to be propelled, and press-fitted into the ground. In the construction method of the underground structure that puts the box together with the tip and pushes it together with the rectangular array of box roofs along with the promotion and traction of the box,
A box-shaped roof is placed inside the box-shaped rectangular array by press-fitting into the ground,
When pushing out the box roof simultaneously with propulsion and traction of the concrete box, the inner earth and sand in the rectangular array of the box roof is reduced by the propulsion cross section of the box roof where the array is installed. Construction method of structure. 推進しようとするコンクリート函体の外形に対応するように箱形ルーフを下段、側部及び上段の矩形配列に組み配置して、地中に圧入した後、前記箱形ルーフ端部に函体の先端部を合わせて函体を配置して函体の推進や牽引とともに箱形ルーフの矩形配列と一緒に押し出す地下構造物の施工法において、
箱形ルーフの矩形配列の内方にパイプルーフを地中に圧入により配列設置し、
コンクリート函体の推進や牽引と同時に箱形ルーフを押出す際に箱形ルーフの矩形配列の内方の土砂を前記配列設置するパイプルーフの推進断面分減少させておくことを特徴とする地下構造物の施工法。 The box-shaped roof is assembled and arranged in a rectangular arrangement of the lower, side, and upper stages so as to correspond to the outer shape of the concrete box to be propelled, and press-fitted into the ground. In the construction method of the underground structure that puts the box together with the tip and pushes it together with the rectangular array of box roofs along with the promotion and traction of the box,
Pipe roofs are placed inside the box-shaped rectangular array by press-fitting into the ground,
An underground structure characterized in that when pushing out a box roof simultaneously with propulsion and traction of a concrete box, the inner earth and sand of the rectangular array of the box roof is reduced by the propulsion cross section of the pipe roof where the array is installed. Construction method of things.
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