JP2021181751A - Reaction force structure and method for launching concrete box or open shield machine - Google Patents

Reaction force structure and method for launching concrete box or open shield machine Download PDF

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JP2021181751A
JP2021181751A JP2021138902A JP2021138902A JP2021181751A JP 2021181751 A JP2021181751 A JP 2021181751A JP 2021138902 A JP2021138902 A JP 2021138902A JP 2021138902 A JP2021138902 A JP 2021138902A JP 2021181751 A JP2021181751 A JP 2021181751A
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reaction force
concrete box
open shield
shield machine
steel sheet
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JP7177233B2 (en
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誠 植村
Makoto Uemura
賢治郎 植村
Kenjiro Uemura
元晶 伊藤
Motoaki Ito
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Abstract

To provide a reaction force structure and method for launching a concrete box and a shield machine that can launch a concrete box without damaging the concrete box and without installing a launching shaft, so that, even when the reaction force cannot be taken at the back of a launching shaft, the propulsion reaction force can be secured from other parts without the need for large-scale auxiliary measures.SOLUTION: A concrete box 8 that receives the thrust of an open shield machine is placed in position, earth retaining steel sheet piles 17 are placed on both sides of the concrete box 8, a reaction force transmitting steel 19 is crossed inside the earth retaining steel sheet piles 17 to form a reaction force transmitting structure 20 that is an integral structure with the earth retaining steel sheet piles 17, and a support body 21 that receives the support pressure of the rear end of the concrete box 8 is erected in the width direction of the reaction force transmitting structure 20.SELECTED DRAWING: Figure 1

Description

本発明は、推進工法におけるコンクリート函体もしくはオープンシールド工法におけるオープンシールド機の発進反力構造および方法に関するものである。 The present invention relates to a starting reaction force structure and method of a concrete box in a propulsion method or an open shield machine in an open shield method.

推進工法は、推進管（主に鉄筋コンクリート管）の先端に掘進機を取り付け、地中を掘削しつつ、後方の油圧ジャッキで推し進めて、管を埋設する工法で、地面を掘り起こして管を設置する「開削工法」に対して「非開削工法」と呼ばれている。 The propulsion method is a method of attaching an excavator to the tip of a propulsion pipe (mainly a reinforced concrete pipe), excavating the ground, pushing it with a hydraulic jack at the rear, and burying the pipe. It is called "non-cutting method" as opposed to "opening method".

図１２に示すように、推進工法の機械構成は、立坑（発進立坑）Ａ、支圧壁Ｂ、推進台Ｃ、元押ジャッキＤ、押輪Ｅ、ストラットＦ、押角Ｇ、推進管Ｈ、掘進機Ｉ（又は刃口）からなっており、長距離推進の場合はさらに中押装置Ｊが設置される。 As shown in FIG. 12, the mechanical configuration of the propulsion method includes a shaft (starting shaft) A, a bearing wall B, a propulsion base C, a main push jack D, a push wheel E, a strut F, a push angle G, a propulsion pipe H, and a drilling machine. It consists of I (or blade edge), and in the case of long-distance propulsion, a middle push device J is further installed.

図中Ｋは発進口壁、Ｌは門型クレーン、Ｍは元押し、中押し用油圧ポンプ、Ｎは滑材圧送ポンプ、Ｏは滑材ミキサーである。 In the figure, K is a starting port wall, L is a gantry crane, M is a main push, a hydraulic pump for middle push, N is a lubricant pump, and O is a lubricant mixer.

推進工法は、先端の掘進機Ｉ（又は刃口）で掘削を行い、元押ジャッキＤを伸長して推進管Ｈを推し進める。 In the propulsion method, excavation is performed with the excavator I (or the cutting edge) at the tip, and the main push jack D is extended to push the propulsion pipe H.

推進工法に関しては、先行技術文献として多くの特許文献があるが、支圧壁Ｂに関しては特に特許文献はない。 Regarding the propulsion method, there are many patent documents as prior art documents, but there is no particular patent document regarding the bearing wall B.

また、下記特許文献は、開削工法とシールド工法の長所を生かした合理性に富むオープンシールド工法により施工する場合に、施工個所の上方に橋桁等の障害物が横切る場合でも、オープンシールド工法に用いたオープンシールド機はそのまま設置してこの障害物の影響を受けずに地下構造物を施工し、また、障害物通過後はオープンシールド工法にすぐ移行して施工を続行できるものとして提案されたものである。
特開平７−２６９２８９号公報 In addition, the following patent documents are used for the open shield method even when an obstacle such as a bridge girder crosses above the construction site when constructing by the highly rational open shield method that makes the best use of the advantages of the open excavation method and the shield method. It was proposed that the open shield machine that had been installed can be installed as it is and the underground structure can be constructed without being affected by this obstacle, and after the obstacle has passed, the construction can be continued by immediately shifting to the open shield method. Is.
Japanese Unexamined Patent Publication No. 7-269289

この特許文献１は、オープンシールド工法と、オープンシールド機の前面を掘削・排土し、オープンシールド機ごとコンクリート函体を発進立坑に設置した推進ジャッキで押し出し、該推進ジャッキと押し出したコンクリート函体との間に新たなコンクリート函体を配設して押し出しを繰り返す推進工法とを組み合わせる。かかるオープンシールド工法と推進工法の組み合わせについてはその概要を図７に示す。 In this Patent Document 1, the open shield method and the front surface of the open shield machine are excavated and excavated, and the concrete box together with the open shield machine is extruded by the propulsion jack installed in the starting shaft, and the propulsion jack and the extruded concrete box are extruded. A new concrete box is placed between the and, and it is combined with the propulsion method that repeats extrusion. The outline of the combination of the open shield method and the propulsion method is shown in FIG.

先にオープンシールド工法を図７〜図１１について説明する。オープンシールド工法で使用するオープンシールド機１は、基本的には左右の側壁板とこれら側壁板と同程度の長さでその間を連結する底板とからなる前面、後面及び上面を開口したシールド機である。 First, the open shield method will be described with reference to FIGS. 7 to 11. The open shield machine 1 used in the open shield method is basically a shield machine with open front, rear and top surfaces consisting of left and right side wall plates and a bottom plate connecting between them with the same length as these side wall plates. be.

該オープンシールド機１は機体を前後方向で複数に分割し、フロント部２としての前方の機体の後端にテール部３としての後方の機体の前端が嵌入して、相互の嵌合部で屈曲可能とした。 The open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction, and the front end of the rear body as the tail part 3 is fitted into the rear end of the front body as the front part 2, and is bent at the mutual fitting part. It was possible.

フロント部２は主として掘削を行うもので、前端と上面を開放面としてあり、機体内で後部に後方へ向けて中折ジャッキ４を左右によせて、また上下複数段に配設している。 The front portion 2 is mainly used for excavation, and the front end and the upper surface are open surfaces, and the middle fold jacks 4 are arranged in a plurality of upper and lower stages in the machine body with the middle fold jacks 4 facing rearward toward the rear.

これに対してテール部３はコンクリート函体８の設置を行うもので、機体内で前部に後方へ向けてシールドジャッキ５を左右によせて、また上下複数段に配設したジャッキ部と、その後方でスペースを確保した函体吊下し部を構成している。 On the other hand, the tail portion 3 is for installing the concrete box body 8, and the shield jacks 5 are placed on the left and right sides toward the front portion in the aircraft body, and the jack portions are arranged in a plurality of upper and lower stages. It constitutes a box hanging part that secures space behind.

図中６はフロント部２の前端に設けた可動分割刃口である。 In the figure, 6 is a movable split blade edge provided at the front end of the front portion 2.

このようなオープンシールド機１を使用するオープンシールド工法は、図８〜図１１に示すように、発進立坑と到達坑との間で施工される。発進立坑１１内で前記オープンシールド機を組立て、発進立坑１１の前の地盤を地上に設置したシャベル系の掘削機１２で掘削し、該オープンシールド機１のシールドジャッキ５を伸長して発進立坑１１内の反力壁（図示せず）に反力をとってオープンシールド機１を前進させ、地下構造物を形成する第１番目のコンクリート函体８を上方から吊り降し、オープンシールド機１のテール部３内で縮めたシールドジャッキ５の後方にセットする。 As shown in FIGS. 8 to 11, the open shield method using such an open shield machine 1 is constructed between the starting shaft and the reaching shaft. The open shield machine is assembled in the starting shaft 11, the ground in front of the starting shaft 11 is excavated by a shovel-type excavator 12 installed on the ground, and the shield jack 5 of the open shield machine 1 is extended to extend the starting shaft 11. The open shield machine 1 is advanced by taking a reaction force against the inner reaction force wall (not shown), and the first concrete box 8 forming the underground structure is suspended from above to form the open shield machine 1. Set behind the contracted shield jack 5 in the tail portion 3.

次いで、同様に掘削機１２でフロント部２の前面又は上面から土砂を掘削し、かつ排土してオープンシールド機１を前進させ、前記第１番目のコンクリート函体８の前に第２番目のコンクリート函体８をテール部３内に吊り降す。 Next, in the same manner, the excavator 12 excavates the earth and sand from the front surface or the upper surface of the front portion 2, and the soil is discharged to advance the open shield machine 1, and the second concrete box 8 is placed in front of the first concrete box 8. The concrete box 8 is suspended in the tail portion 3.

以下、同様の掘進及びコンクリート函体８のセット工程を繰返して、順次コンクリート函体８を縦列に地中に埋設し、後方のコンクリート函体８上にダンプ１４で埋戻しを施し、オープンシールド機１が到達立坑１３まで達したならばこれを分解・撤去して工事を完了する。図中１５はグラウト機である。 Hereinafter, the same excavation and setting process of the concrete box 8 are repeated, the concrete boxes 8 are sequentially buried in the ground in a column, and the concrete box 8 at the rear is backfilled with the dump 14 to create an open shield machine. When 1 reaches the reaching shaft 13, it is disassembled and removed to complete the construction. In the figure, 15 is a grout machine.

かかるオープンシールド工法で推進工法を取り入れる場合は、図発進立坑１１内にコンクリート製の厚い支圧壁７を形成し、ここに元押しジャッキ９を設置し、これでコンクリート函体８を推進させる。図中１０は受台鋼である。 When the propulsion method is adopted by the open shield method, a thick concrete bearing wall 7 is formed in the starting shaft 11 in the figure, and a push jack 9 is installed therein to propel the concrete box 8. In the figure, 10 is a pedestal steel.

下記特許文献は発進立坑を築造して、発進立坑からオープンシールド機を発進する場合に、発進立坑の切梁支保工を支障なく撤去でき、鏡切りが不要であり、発進立坑の坑口の地盤改良の必要が無く、安価かつ工期の短縮が可能となるオープンシールド工法のオープンシールド機発進方法を提供するものとして、本出願人が出願し、特許を取得したものである。
特開２０１２−９２６０１号公報 According to the following patent documents, when the starting shaft is constructed and the open shield machine is started from the starting shaft, the girder support of the starting shaft can be removed without any trouble, no mirror cutting is required, and the ground improvement of the shaft entrance of the starting shaft is required. This application has been filed and patented as providing a method for starting an open shield machine of the open shield method, which is inexpensive and can shorten the construction period.
Japanese Unexamined Patent Publication No. 2012-92601

左右側壁板の内側に推進ジャッキを配設し、前面、後面及び上面を開口したオープンシールド機の前面又は上面開口より前方の土砂を掘削排土する工程と、推進ジャッキを伸長して反力壁もしくはコンクリート函体を反力にしてシールド機を前進させる工程と、シールド機のテール部内で縮めた推進ジャッキの後方に新たなコンクリート函体を上方から吊り降してセットする工程とを適宜繰り返してコンクリート函体を縦列に順次埋設するオープンシールド工法において、オープンシールド機は、側壁板を上下段に適宜分割して、ボルト接合で組立可能であり、発進立坑築造後、オープンシールド機の組立に応じて、オープンシールド機より上の支保工を撤去し、立坑内のオープンシールド機側部を埋戻土または処理土で埋め戻し、オープンシールド機の組立完了後、鏡土留矢板を引き抜き、オープンシールド機を発進させる。 A process of arranging propulsion jacks inside the left and right side wall plates to excavate and drain the earth and sand in front of the front or top opening of the open shield machine that opens the front, rear and top surfaces, and extending the propulsion jack to the reaction force wall. Alternatively, the process of moving the shield machine forward by using the concrete box as a reaction force and the process of suspending and setting a new concrete box from above behind the propulsion jack that has been shrunk in the tail of the shield machine are repeated as appropriate. In the open shield method in which concrete boxes are sequentially buried in columns, the open shield machine can be assembled by dividing the side wall plates into upper and lower stages and bolting them together. Then, the support work above the open shield machine is removed, the side of the open shield machine in the shaft is backfilled with backfill soil or treated soil, and after the assembly of the open shield machine is completed, the mirror soil retaining sheet pile is pulled out and the open shield machine is used. To start.

前記推進工法は原則として発進用の立坑Ａを形成し、ここに鉄筋コンクリート製の支圧壁Ｂを設けて、この支圧壁Ｂで元押ジャッキＤの推進反力を受けて、推進管Ｈを推し進める。 In the propulsion method, as a general rule, a shaft A for starting is formed, a bearing wall B made of reinforced concrete is provided here, and the bearing wall B receives the propulsion reaction force of the main push jack D to provide the propulsion pipe H. Push forward.

前記図７に示すオープンシールド工法との組み合わせの場合は、発進立坑１１内に支圧壁７等の元押し設備を構築する。 In the case of the combination with the open shield method shown in FIG. 7, a main pushing facility such as a bearing wall 7 is constructed in the starting shaft 11.

従って、立坑Ａや発進立坑１１はこのような支圧壁Ｂや支圧壁７を設けるだけの、堅牢さと、スペースが必要とするものとされる。 Therefore, the shaft A and the starting shaft 11 are required to have sufficient robustness and space to provide such a bearing wall B and a bearing wall 7.

発進立坑背面反力部分に既設水路が存在する場合や、反力部分地山が軟弱地盤である場合、十分な強度を有する立坑Ａ、発進立坑１１を構築できないので、支圧壁Ｂや支圧壁７を介在させた立坑背面の受動土圧だけでは推進の反力の確保が困難となり、オープンシールド工法にて推進する為には大掛かりな補助工事が必要となる。 If there is an existing waterway in the reaction force part on the back of the starting shaft, or if the ground of the reaction force part is soft ground, the shaft A and the starting shaft 11 with sufficient strength cannot be constructed, so the bearing wall B and bearing pressure can not be constructed. It is difficult to secure the reaction force of the propulsion only by the passive earth pressure on the back of the shaft with the wall 7 interposed therebetween, and a large-scale auxiliary work is required to propel the propulsion by the open shield method.

前記反力部分に既設水路が存在する場合では、既設水路を埋め戻すと降雨による増水時に発進立坑から、背面の既設水路に水路流水を通水することが出来ず、周辺宅地の浸水被害の原因となる。 If there is an existing canal in the reaction force part, if the existing canal is backfilled, it will not be possible to pass the canal running water from the starting shaft to the existing canal on the back when the water level rises due to rainfall, causing inundation damage to the surrounding residential land. Will be.

前記軟弱地盤である場合、背面地山に地盤改良等を施す必要があり、経済的に高価となる。 In the case of the soft ground, it is necessary to improve the ground on the back ground, which is economically expensive.

前記特許文献１は、発進立坑は、少なくとも前面および上面開口の鋼製チャンバーをオープンシールド機のテール部内に設置して形成することにより、オープンシールド工法で設置したコンクリート函体はそのままにして、かつ、これを反力にして推進工法でコンクリート函体を推進できるとあるが、オープンシールド工法で設置したコンクリート函体を反力体として用いるのは、コンクリート函体を痛めるおそれがある。 In Patent Document 1, the starting shaft is formed by installing a steel chamber having at least a front surface and an upper surface opening in the tail portion of the open shield machine, so that the concrete box body installed by the open shield method is left as it is, and It is said that the concrete box can be propelled by the propulsion method using this as a reaction force, but using the concrete box installed by the open shield method as the reaction force may damage the concrete box.

ちなみに、コンクリート函体の大きさは多少大小があるが、高さが１〜２ｍ程度、幅が１〜３ｍ程度、長さが１〜３ｍ程度で、かなり大きなものである。従って、円形のコンクリートヒューム管とは大きさや用途が異なる。 By the way, the size of the concrete box is somewhat large and small, but the height is about 1 to 2 m, the width is about 1 to 3 m, and the length is about 1 to 3 m, which are quite large. Therefore, it is different in size and use from the circular concrete Hume pipe.

このようなコンクリート函体ではシールド機を前進させるための推進ジャッキでの力が加えられた際には大丈夫でも、コンクリート函体の推進はかなりの力を受け、コンクリート函体の左側壁版、右側壁版は圧縮される状態となり、上床版や下床版に曲げモーメントがかかりその端面にクラックが入るおそれがある。 With such a concrete box, it is okay when the force of the propulsion jack to move the shield machine forward is applied, but the propulsion of the concrete box receives a considerable force, and the left side wall version of the concrete box, the right side. The wall slab is in a compressed state, and a bending moment is applied to the upper and lower floor slabs, which may cause cracks in the end faces.

元押し設備を必要としないシールド工法においても、シールド機の初期推進の発進反力部分については前記推進工法と同様であり、反力部分に既設水路が存在する場合や、反力部分が軟弱地盤である場合、不都合が生じる。 Even in the shield method that does not require a pusher, the starting reaction force part of the initial propulsion of the shield machine is the same as the above propulsion method, and if there is an existing waterway in the reaction force part or the reaction force part is soft ground. If this is the case, inconvenience will occur.

前記特許文献２は、図面内記載の12（支保工）、12a（中段支保工）、12b（上段支保工）は土留め構造を保つための鋼矢板の支保工であり、反力鋼材ではない。 In Patent Document 2, 12 (supporting work), 12a (middle stage supporting work), and 12b (upper stage supporting work) described in the drawings are support works for steel sheet piles for maintaining the earth retaining structure, and are not reaction force steel materials. ..

図２、図３記載の通り、支保工はオープンシールド機(1)部材より上部に配置されており、オープンシールド機の推力を受けるコンクリート函体とは高さ方向で接することは無く、反力とはなり得ない。 As shown in FIGS. 2 and 3, the support work is located above the open shield machine (1) member, and does not come into contact with the concrete box that receives the thrust of the open shield machine in the height direction, and the reaction force. Cannot be.

このように特許文献２では反力壁は発進反力背面部分に当発明が解決するための課題として挙げたような反力がとれない場合については考慮されていない。 As described above, in Patent Document 2, the reaction force wall does not take into consideration the case where the reaction force cannot be taken as the problem for solving the present invention on the back surface portion of the starting reaction force.

本発明の目的は前記従来例の不都合を解消し、地山への摩擦力を利用して反力伝達構造物を形成できるので、発進立坑を設けることなくコンクリート函体の推進、シールド機の発進が可能となるコンクリート函体、およびシールド機の発進反力構造および方法を提供することにある。 An object of the present invention is to eliminate the inconvenience of the above-mentioned conventional example and to form a reaction force transmission structure by utilizing the frictional force on the ground. Therefore, the concrete box can be propelled and the shield machine can be started without providing a starting shaft. It is an object of the present invention to provide a starting reaction force structure and method for a concrete box and a shield machine.

前記目的を達成するため請求項１記載の本発明は、オープンシールド機の推力を受けるコンクリート函体を定置配置し、このコンクリート函体の左右両側方に土留め鋼矢板を配設し、土留め鋼矢板の内側に反力伝達鋼材を横架して土留め鋼矢板と一体構造となる反力伝達構造物を形成し、コンクリート函体後端の支圧を受ける支圧体をこの反力伝達構造物の幅方向に架設することをオープンシールド機の推力を受けるためコンクリート函体を定置配置し、このコンクリート函体の左右両側方に土留め鋼矢板を配設し、土留め鋼矢板の内側に反力伝達鋼材を横架して反力伝達構造物を形成し、コンクリート函体後端の支圧を受ける支圧体をこの反力伝達構造物の幅方向に架設したことを要旨とするものである。 In order to achieve the above object, in the present invention according to claim 1, a concrete box body that receives the thrust of an open shield machine is stationaryly arranged, and earth retaining steel sheet piles are arranged on both left and right sides of the concrete box body, and earth retaining is performed. A reaction force transmission steel material is laid horizontally inside the steel sheet pile to form a reaction force transmission structure that is integrated with the earth retaining steel sheet pile, and this reaction force transmission is carried out by the bearing body that receives the bearing pressure at the rear end of the concrete box. A concrete box is placed stationary to receive the thrust of the open shield machine when erected in the width direction of the structure, and earth retaining steel sheet piles are arranged on both the left and right sides of this concrete box, and the inside of the earth retaining steel sheet pile. The gist is that a reaction force transmission steel material is laid horizontally on the concrete box to form a reaction force transmission structure, and a bearing body that receives the bearing pressure at the rear end of the concrete box is erected in the width direction of this reaction force transmission structure. It is a thing.

請求項２記載の本発明は、オープンシールド機の推力を受けるためコンクリート函体を定置配置し、このコンクリート函体の左右両側方に土留め鋼矢板を配設し、土留め鋼矢板の内側に反力伝達鋼材を横架して反力伝達構造物を形成し、コンクリート函体後端の支圧を受ける支圧体をこの反力伝達構造物の幅方向に架設した発進反力構造を形成し、この発進反力構造およびコンクリート函体を反力としてオープンシールド機を発進させることを要旨とするものである。 In the present invention according to claim 2, a concrete box is stationaryly arranged to receive the thrust of an open shield machine, earth retaining steel sheet piles are arranged on both left and right sides of the concrete box, and inside the earth retaining steel sheet pile. A reaction force transmission structure is formed by laying a reaction force transmission steel material horizontally, and a starting reaction force structure is formed by erection of a bearing body that receives the bearing pressure at the rear end of the concrete box in the width direction of this reaction force transmission structure. However, the gist is to start the open shield machine by using this starting reaction force structure and the concrete box as the reaction force.

本発明によれば、元押しジャッキやコンクリート函体の支圧を受ける支圧体は、間接的に反力伝達構造物を介して土留め鋼矢板と一体の構造となり、土留め鋼矢板側部に発生する地山と鋼矢板との摩擦力を期待できる反力構造となるので、４方を囲むような立坑を形成しなくとも推進反力を確保することができる。 According to the present invention, the bearing body that receives the bearing pressure of the main push jack or the concrete box is indirectly integrated with the earth retaining steel sheet pile via the reaction force transmission structure, and the side portion of the earth retaining steel sheet pile. Since the reaction force structure is such that the frictional force between the ground and the steel sheet pile generated in the above can be expected, the propulsion reaction force can be secured without forming a shaft surrounding the four sides.

このように完璧な発進立坑を形成しなくもとよいので、背面に既設水路が存在する場合についても、既設水路を埋め戻すことなく施工可能である為、降雨時の増水、水路への通水を確保した施工が可能である。 Since it is not necessary to form a perfect starting shaft in this way, even if there is an existing waterway on the back, it can be constructed without backfilling the existing waterway. It is possible to carry out construction that secures.

また、発進箇所の背面の地山が軟弱地盤であり反力が期待出来ない場合においても、補助工法等を必要とせず、例えば、オープンシールド工法と推進工法を組み合わせる場合のオープンシールド工での推進が可能となり、十分な反力を期待でき、経済的である。 In addition, even if the ground behind the starting point is soft ground and reaction force cannot be expected, no auxiliary method is required. For example, propulsion by open shield method when the open shield method and propulsion method are combined. Is possible, and sufficient reaction force can be expected, which is economical.

同様に発進箇所立坑背面直近に構造体があり、土留め、厚い支圧コンクリートの築造が困難である場合においても施工が可能である。 Similarly, there is a structure near the back of the shaft at the starting point, and construction is possible even when it is difficult to retain soil or build thick bearing concrete.

支圧コンクリートを築造することなく施工可能である為、スクラップ鋼材は発生するが、コンクリートからは発生しない。 Since it can be constructed without constructing bearing concrete, scrap steel is generated, but not from concrete.

従来のような発進立坑として形成する場合でも土留め鋼矢板側部に発生する地山と鋼矢板との摩擦力を期待できる反力構造となるので、立坑自体が大きな反力体となり、支圧構造の剛性が高い為、推進による反力部分の変位が少なく、推進精度が向上する。 Even when it is formed as a starting shaft as in the past, it has a reaction force structure that can expect the frictional force between the ground and the steel sheet pile generated on the side of the earth retaining steel sheet pile, so the shaft itself becomes a large reaction force body and supports pressure. Since the structure has high rigidity, the displacement of the reaction force part due to propulsion is small, and the propulsion accuracy is improved.

以上述べたように本発明のコンクリート函体やシールド機の発進反力構造および方法は、地山への摩擦力を利用して反力伝達構造物を形成できるので、大掛かりな発進立坑を設けることや、もしくは発進立坑を設けることなくコンクリート函体の発進が可能となるものである。 As described above, the starting reaction force structure and method of the concrete box and the shield machine of the present invention can form a reaction force transmitting structure by utilizing the frictional force to the ground, so that a large-scale starting shaft is provided. Or, it is possible to start a concrete box without installing a starting shaft.

本発明のコンクリート函体の発進反力構造および方法の第１実施形態を示す平面図である。It is a top view which shows 1st Embodiment of the start reaction force structure and method of the concrete box body of this invention. 本発明のコンクリート函体の発進反力構造および方法の第１実施形態を示す中央縦断側面図である。It is a central longitudinal side view which shows 1st Embodiment of the start reaction force structure and method of the concrete box body of this invention. 図１のＡ−Ａ線矢視図である。It is the AA line arrow view of FIG. 図１のＢ−Ｂ線矢視図であるIt is a BB line arrow view of FIG. 図１のＣ−Ｃ線矢視図であるFIG. 1 is a view taken along the line CC of FIG. 函***置調整材を設けてなる支圧体の斜視図である。It is a perspective view of the pressure bearing body provided with the box body position adjusting material. 推進工法併用のオープンシールド工法の説明図である。It is explanatory drawing of the open shield method with the propulsion method. オープンシールド工法の第１工程を示す側面図である。It is a side view which shows the 1st process of the open shield method. オープンシールド工法の第２工程を示す側面図である。It is a side view which shows the 2nd process of the open shield method. オープンシールド工法の第３工程を示す側面図である。It is a side view which shows the 3rd process of the open shield method. オープンシールド工法の第４工程を示す側面図である。It is a side view which shows the 4th process of the open shield method. 推進工法の概要説明図である。It is a schematic explanatory diagram of a propulsion method.

以下、図面について本発明の実施の形態を詳細に説明する。図１は本発明のコンクリート函体の発進反力構造および方法の第１実施形態を示す平面図、図２は同上側面図で、図中８はコンクリート函体を示すが、これはオープンシールド機１の推力を受けるために定置配置されるものである。 Hereinafter, embodiments of the present invention will be described in detail with respect to the drawings. FIG. 1 is a plan view showing a first embodiment of a starting reaction force structure and a method of a concrete box of the present invention, FIG. 2 is a side view of the same as above, and FIG. 8 in the figure shows a concrete box, which is an open shield machine. It is placed stationary to receive the thrust of 1.

オープンシールド機１は、基本的には左右の側壁板とこれら側壁板と同程度の長さでその間を連結する底板とからなる前面、後面及び上面を開口したシールド機である。 The open shield machine 1 is basically a shield machine having an open front surface, a rear surface, and an upper surface, which are composed of left and right side wall plates and a bottom plate connecting the side wall plates having the same length as the side wall plates.

該オープンシールド機１は機体を前後方向で複数に分割し、フロント部２としての前方の機体の後端にテール部３としての後方の機体の前端が嵌入して、相互の嵌合部で屈曲可能とした。 The open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction, and the front end of the rear body as the tail part 3 is fitted into the rear end of the front body as the front part 2, and is bent at the mutual fitting part. It was possible.

フロント部２は主として掘削を行うもので、前端と上面を開放面としてあり、機体内で後部に後方へ向けて中折ジャッキ４を左右によせて、また上下複数段に配設している。 The front portion 2 is mainly used for excavation, and the front end and the upper surface are open surfaces, and the middle fold jacks 4 are arranged in a plurality of upper and lower stages in the machine body with the middle fold jacks 4 facing rearward toward the rear.

これに対してテール部３はコンクリート函体８の設置を行うもので、機体内で前部に後方へ向けてシールドジャッキ５を左右によせて、また上下複数段に配設したジャッキ部と、その後方でスペースを確保した函体吊下し部を構成している。 On the other hand, the tail portion 3 is for installing the concrete box body 8, and the shield jacks 5 are placed on the left and right sides toward the front portion in the aircraft body, and the jack portions are arranged in a plurality of upper and lower stages. It constitutes a box hanging part that secures space behind.

図中６はフロント部２の前端に設けた可動分割刃口である。 In the figure, 6 is a movable split blade edge provided at the front end of the front portion 2.

オープンシールド機１を用いたオープンシールド工法で、既設水路１６に繋げる新たな水路を構築するような場合で、元押し設備を必要としない場合である。 This is a case where a new waterway connected to the existing waterway 16 is constructed by the open shield method using the open shield machine 1, and the main push equipment is not required.

このような場合において、シールド機の初期推進の発進反力部分については反力部分に既設水路が存在する場合や、反力部分が軟弱地盤である場合、不都合が生じる。 In such a case, regarding the starting reaction force portion of the initial propulsion of the shield machine, inconvenience occurs when an existing water channel exists in the reaction force portion or when the reaction force portion is soft ground.

コンクリート函体８の左右両側方に多少間隔を存してシートパイルによる土留め鋼矢板１７を並行に配設し、また、相対向する土留め鋼矢板１７の下方には、捨て石および捨てコンクリートを敷設し、その上に受台２５を設置する。 Retaining steel sheet piles 17 made of sheet piles are arranged in parallel on both the left and right sides of the concrete box 8 with some space between them, and waste stones and discarded concrete are placed below the opposing earth retaining steel sheet piles 17. It is laid and the cradle 25 is installed on it.

前記土留め鋼矢板１７の内側にアングル材によるブラケット１８を溶接等で取付け、このブラケット１８で挟み込むようにしてＣチャンネル材のような形鋼による反力伝達鋼材１９を複数段に横架して反力伝達構造物２０を形成した。 A bracket 18 made of an angle material is attached to the inside of the earth retaining steel sheet pile 17 by welding or the like, and a reaction force transmission steel material 19 made of a shaped steel such as a C channel material is laid horizontally in a plurality of stages so as to be sandwiched between the brackets 18. The reaction force transmission structure 20 was formed.

反力伝達構造物２０の幅方向、すなわち相対向する土留め鋼矢板１７間に端部をボルト２４で反力伝達鋼材１９に固定したＨ形鋼による横方向部材２１ａとこの横方向部材２１ａに直交させる縦方向部材２１ｂとで格子に枠組んだ支圧体２１を架設する。（図４参照） In the width direction of the reaction force transmission structure 20, that is, in the lateral direction member 21a and the lateral direction member 21a made of H-shaped steel whose ends are fixed to the reaction force transmission steel material 19 with bolts 24 between the earth retaining steel sheet piles 17 facing each other. A bearing body 21 framed in a grid with a vertical member 21b to be orthogonal to each other is erected. (See Fig. 4)

該支圧体２１はコンクリート函体８の後端に函***置調整材２６としてキリンジャッキ等およびＨ鋼による支圧鋼２７を設置した。その詳細を図６に示す。 In the bearing body 21, a giraffe jack or the like and a bearing steel 27 made of H steel were installed at the rear end of the concrete box 8 as the box body position adjusting material 26. The details are shown in FIG.

このようにコンクリート函体８の左右両側方に土留め鋼矢板１７を配設し、土留め鋼矢板１７の内側に反力伝達鋼材１９を横架して反力伝達構造物２０を形成し、コンクリート函体８の後端の支圧を受ける支圧体２１をこの反力伝達構造物２０の幅方向に架設した。 In this way, the earth retaining steel sheet piles 17 are arranged on both the left and right sides of the concrete box 8, and the reaction force transmission steel material 19 is laid horizontally inside the earth retaining steel sheet piles 17 to form the reaction force transmission structure 20. A bearing body 21 that receives bearing pressure at the rear end of the concrete box 8 was erected in the width direction of the reaction force transmission structure 20.

該支圧体２１はコンクリート函体８の後端への元押しジャッキ９の支圧を受けるもので、元押しジャッキ９を設置するジャッキ架台２３をこの支圧体２１の前に置く。 The bearing body 21 receives the bearing pressure of the original pushing jack 9 to the rear end of the concrete box 8, and the jack pedestal 23 on which the original pushing jack 9 is installed is placed in front of the bearing body 21.

次に使用法について説明すると、コンクリート函体８を推進させるには元押しジャッキ９を伸長してこの元押しジャッキ９によりコンクリート函体８を押し出す。 Next, to explain the usage, in order to propel the concrete box 8, the main push jack 9 is extended and the concrete box 8 is pushed out by the main push jack 9.

図示は省略するが縦列するコンクリート函体８の先端にはオープンシールド機が設置され、オープンシールド工法によりコンクリート函体８は設置されていた。（地上に設置したショベルカーで、オープンシールド機の刃口部を掘削し、オープンシールド機の前進とコンクリート函体の吊下し・設置を繰り返す。） Although not shown, an open shield machine was installed at the tip of the parallel concrete boxes 8, and the concrete boxes 8 were installed by the open shield method. (With a shovel car installed on the ground, excavate the cutting edge of the open shield machine, move the open shield machine forward, and hang and install the concrete box repeatedly.)

橋梁等の構造物下を施工する場合、オープンシールド工法を取れないので、オープンシールド機の刃口部分はオープンシールド機内部から掘削し、このオープンシールド機ごとコンクリート函体８を元押しジャッキ９で推進させる。 When constructing under a structure such as a bridge, the open shield method cannot be used, so the blade edge of the open shield machine is excavated from inside the open shield machine, and the concrete box 8 is pushed together with the open shield machine with the jack 9. To promote.

元押しジャッキ９の推進反力は支圧体２１で受けるが、これが反力伝達鋼材１９を介して土留め鋼矢板１７に伝わり、土留め鋼矢板１７の側部に発生する地山と鋼矢板との摩擦力を利用することができる。 The propulsion reaction force of the main push jack 9 is received by the bearing body 21, but this is transmitted to the earth retaining steel sheet pile 17 via the reaction force transmission steel material 19, and the ground and the steel sheet pile generated on the side of the earth retaining steel sheet pile 17. The frictional force with and can be used.

１…オープンシールド機
２…フロント部 ３…テール部
４…中折ジャッキ ５…シールドジャッキ
６…可動分割刃口 ７…支圧壁
８…コンクリート函体 ９…元押しジャッキ
１０…受台鋼 １１…発進立坑
１２…掘削機 １３…到達坑
１４…ダンプ １５…グラウト機
１６…既設水路 １７…土留め鋼矢板
１８…ブラケット １９…反力伝達鋼材
２０…反力伝達構造物 ２１…支圧体
２１ａ…横方向部材 ２１ｂ…縦方向部材
２１ｃ…支圧コンクリート壁 ２３…ジャッキ架台
２４…ボルト ２５…受台
２６…函***置調整材 ２７…支圧鋼
２８…押角 1 ... Open shield machine 2 ... Front part 3 ... Tail part 4 ... Middle fold jack 5 ... Shield jack 6 ... Movable split cutting edge 7 ... Supporting wall 8 ... Concrete box 9 ... Main push jack 10 ... Stand steel 11 ... Starting shaft 12 ... Excavator 13 ... Reaching shaft 14 ... Dump 15 ... Grout machine 16 ... Existing waterway 17 ... Retaining steel sheet pile 18 ... Bracket 19 ... Reaction force transmission steel 20 ... Reaction force transmission structure 21 ... Supporting body 21a ... Horizontal member 21b ... Vertical member 21c ... Supporting concrete wall 23 ... Jack stand 24 ... Bolt 25 ... Cradle 26 ... Box position adjusting material 27 ... Supporting steel 28 ... Push angle

Claims (2)

オープンシールド機の推力を受けるコンクリート函体を定置配置し、このコンクリート函体の左右両側方に土留め鋼矢板を配設し、土留め鋼矢板の内側に反力伝達鋼材を横架して土留め鋼矢板と一体構造となる反力伝達構造物を形成し、コンクリート函体後端の支圧を受ける支圧体をこの反力伝達構造物の幅方向に架設することを特徴とするオープンシールド機の発進反力構造。 A concrete box that receives the thrust of an open shield machine is placed in a stationary position, earth retaining steel sheet piles are arranged on both the left and right sides of this concrete box, and a reaction force transmission steel material is laid horizontally inside the earth retaining steel sheet pile. An open shield characterized in that a reaction force transmission structure that is integrated with the fastening steel sheet pile is formed, and a bearing body that receives the bearing pressure at the rear end of the concrete box is erected in the width direction of this reaction force transmitting structure. The start reaction force structure of the machine. オープンシールド機の推力を受けるコンクリート函体を定置配置し、このコンクリート函体の左右両側方に土留め鋼矢板を配設し、土留め鋼矢板の内側に反力伝達鋼材を横架して土留め鋼矢板と一体構造となる反力伝達構造物を形成し、コンクリート函体後端の支圧を受ける支圧体をこの反力伝達構造物の幅方向に架設し、この発進反力構造物およびコンクリート函体を反力としてオープンシールド機を発進させることを特徴としたオープンシールド機の発進反力方法。 A concrete box that receives the thrust of an open shield machine is placed in a stationary position, earth retaining steel sheet piles are arranged on both the left and right sides of this concrete box, and a reaction force transmission steel material is laid horizontally inside the earth retaining steel sheet pile. A reaction force transmission structure that is integrated with the fastening steel sheet pile is formed, and a bearing body that receives the bearing pressure at the rear end of the concrete box is erected in the width direction of this reaction force transmitting structure, and this starting reaction force structure is constructed. And the starting reaction force method of the open shield machine, which is characterized by starting the open shield machine by using the concrete box as the reaction force.
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JPS50156215A (en) * 1974-06-06 1975-12-17
JPH0462230A (en) * 1990-06-29 1992-02-27 Koichi Uemura Setting construction for underground structure
JP2007146533A (en) * 2005-11-29 2007-06-14 Makoto Uemura Friction cut plate used in open shield construction method and its fixing method
JP2012092601A (en) * 2010-10-28 2012-05-17 Makoto Uemura Open shield machine start method of open shield method

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