JP2010121294A - Flexible joint structure - Google Patents

Flexible joint structure Download PDF

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Publication number
JP2010121294A
JP2010121294A JP2008293681A JP2008293681A JP2010121294A JP 2010121294 A JP2010121294 A JP 2010121294A JP 2008293681 A JP2008293681 A JP 2008293681A JP 2008293681 A JP2008293681 A JP 2008293681A JP 2010121294 A JP2010121294 A JP 2010121294A
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joint structure
water stop
flexible joint
shaft
pit wall
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JP5282537B2 (en
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Tsutomu Kimura
勉 木村
Kimihiro Yoshida
公宏 吉田
Suenobu Kawakami
季伸 川上
Yoshiji Hino
義嗣 日野
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Obayashi Corp
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Obayashi Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible joint structure adjustable on site to conform to the size of a clearance between a lining body and a pit wall and constructible in the clearance immediately after a boring machine passes. <P>SOLUTION: The flexible joint structure 1 prevents water from flowing into a shaft 3 from a clearance between the segments 5 laid in a tunnel 2 and the pit wall 6 of a shaft 3 in the case of the occurrence of relative displacement between the segments 5 and the pit wall 6. Specifically, the flexible joint structure includes an annular water cut-off member 8 fixed to the segments 5 and the pit wall 6 of the shaft 3 to straddle the clearance 9, and a flexible annular backup member 7 provided inside the shaft 3 rather than the water cut-off member 8, fixed to the segments 5 and the pit wall 6 of the shaft 3 and higher in rigidity than the water cut-off member 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、トンネル内に敷設された覆工体と立坑の坑壁との接続部における可撓性ジョイント構造に関する。   The present invention relates to a flexible joint structure in a connection portion between a lining body laid in a tunnel and a pit wall.

トンネル内に敷設された覆工体と立坑の坑壁との接続部の可撓性ジョイント構造として、例えば、特許文献１には、覆工体のセグメントと坑壁との間の隙間に充填された充填材と、その充填材の流出を防止するとともに、地下水の通過を防止するパッキンと、当該隙間を跨ぐようにセグメントの端面と坑壁の内周面とに取り付けられ、伸縮可能な蛇腹状の可撓性ゴムとを備えた可撓性ジョイント構造が開示されている。   As a flexible joint structure of a connecting portion between a lining body laid in a tunnel and a shaft wall of a shaft, for example, in Patent Document 1, a gap between a segment of a lining body and a pit wall is filled. A filler that prevents the filler from flowing out and prevents the passage of groundwater, and an expandable bellows attached to the end face of the segment and the inner peripheral surface of the pit wall so as to straddle the gap. A flexible joint structure with a flexible rubber is disclosed.

これは、地震等によりセグメントと坑壁との間に相対変位が生じたときに、パッキン及び充填材でセグメントと坑壁との間を通過する地下水を止水するものである。
特開平１１−３２４５６４号公報 In this case, when a relative displacement occurs between the segment and the pit wall due to an earthquake or the like, the groundwater passing between the segment and the pit wall is stopped with the packing and the filler.
JP-A-11-324564

しかしながら、特許文献１に記載の可撓性ジョイント構造では、シールド機が到達立坑に到達する際には、既に到達立坑の坑壁に坑口が構築されているので、坑口の開口部とトンネル外周との間の隙間の大きさに誤差が生じる可能性がある。この誤差が大きい場合には、確実な止水性を確保するための継手部の施工には多大な時間と手間がかかるという問題があった。   However, in the flexible joint structure described in Patent Document 1, when the shield machine reaches the reaching shaft, a wellhead is already constructed in the wall of the reaching shaft, so the opening of the wellhead and the outer periphery of the tunnel An error may occur in the size of the gap between the two. When this error is large, there has been a problem that it takes a lot of time and labor to construct the joint portion to ensure reliable water stoppage.

そこで、本発明は、上記のような従来の問題に鑑みなされたものであって、覆工体と坑壁との間の隙間の大きさに沿うように現場で調整が可能で、かつ、掘進機が通過後、直ちにその隙間内に構築可能な可撓性ジョイント構造を提供することを目的とするものである。   Therefore, the present invention has been made in view of the conventional problems as described above, and can be adjusted on-site along the size of the gap between the lining body and the pit wall, and It is an object of the present invention to provide a flexible joint structure that can be built in the gap immediately after the machine passes.

前記目的を達成するため、本発明の可撓性ジョイント構造は、トンネル内に敷設された覆工体と立坑の坑壁との接続部に相対変位が生じた場合に当該覆工体と当該坑壁との間の隙間を通過して当該立坑内へ水が流入するのを防止する可撓性ジョイント構造であって、前記隙間を跨ぐように前記覆工体と前記坑壁とに固定される環状の止水部材と、前記止水部材よりも前記立坑内側よりに設けられるとともに、前記隙間を跨ぐように前記覆工体と前記坑壁とに固定され、前記止水部材よりも剛性が高く、かつ、可撓性を有する環状のバックアップ部材とを備えることを特徴とする（第１の発明）。   In order to achieve the above object, the flexible joint structure according to the present invention has a structure in which the lining body and the mine shaft are moved when a relative displacement occurs in the connection portion between the lining body laid in the tunnel and the shaft wall of the shaft. It is a flexible joint structure that prevents water from flowing into the shaft through a gap between the wall and is fixed to the lining body and the well wall so as to straddle the gap. An annular water stop member, and provided on the inner side of the shaft than the water stop member, and fixed to the cover body and the pit wall so as to straddle the gap, have higher rigidity than the water stop member. And an annular backup member having flexibility (first invention).

本発明の可撓性ジョイント構造によれば、覆工体と坑壁の間の隙間を跨ぐように覆工体と坑壁とに固定される環状の止水部材と、止水部材よりも立坑内側よりに設けられるとともに、覆工体と坑壁とに固定され、止水部材よりも剛性が高く、かつ、可撓性を有する環状のバックアップ部材とを備えているので、地震等で覆工体と坑壁との接続部に相対変位が生じて、その隙間を地下水が通過しても、立坑内への地下水の流入を防止することができる。また、その隙間を通過した被圧地下水の圧力が止水部材に作用しても、止水部材が伸張してバックアップ部材に接触し、このバックアップ部材が止水部材を支持してその圧力を負担する。したがって、止水部材が被圧地下水の圧力によって破断することは無く、確実に止水性を保持できる。   According to the flexible joint structure of the present invention, an annular water stop member fixed to the cover body and the pit wall so as to straddle a gap between the cover body and the pit wall, and a shaft than the water stop member. Since it is provided from the inside and is fixed to the lining body and the pit wall, it has higher rigidity than the water-stopping member and has a flexible annular backup member. Even if relative displacement occurs in the connection portion between the body and the pit wall, and groundwater passes through the gap, the inflow of groundwater into the shaft can be prevented. Even if the pressure of groundwater that has passed through the gap acts on the water stop member, the water stop member expands and contacts the backup member, and this backup member supports the water stop member and bears the pressure. To do. Accordingly, the water stop member is not broken by the pressure of the groundwater under pressure, and the water stop can be reliably maintained.

本発明において、前記止水部材及び前記バックアップ部材は、径方向及び軸方向に伸縮自在となるように蛇腹状に折りたたまれていることとしてもよい。
本発明の可撓性ジョイント構造によれば、止水部材及びバックアップ部材は、径方向及び軸方向に伸縮自在となるように蛇腹状に折りたたまれているので、覆工体と坑壁との間に相対変位が生じても、伸縮してその変形に速やかに追随することができる。したがって、破損することが無い。 In the present invention, the water blocking member and the backup member may be folded in a bellows shape so as to be expandable and contractable in the radial direction and the axial direction.
According to the flexible joint structure of the present invention, the water stop member and the backup member are folded in a bellows shape so as to be expandable and contractable in the radial direction and the axial direction. Even if a relative displacement occurs, it can be expanded and contracted to quickly follow the deformation. Therefore, it is not damaged.

本発明において、前記止水部材は、止水シートからなることとしてもよい。
本発明の可撓性ジョイント構造によれば、止水シートは、一般的な材料なので、入手性に優れている。 In the present invention, the water stop member may be formed of a water stop sheet.
According to the flexible joint structure of the present invention, the water-stop sheet is a general material and thus is highly available.

本発明において、前記止バックアップ部材は、ワイヤーメッシュからなることとしてもよい。
本発明の可撓性ジョイント構造によれば、ワイヤーメッシュは、一般的な材料なので、入手性に優れている。 In the present invention, the stop backup member may be made of a wire mesh.
According to the flexible joint structure of the present invention, since the wire mesh is a general material, it is highly available.

本発明の可撓性ジョイント構造によれば、覆工体と坑壁との間の隙間の大きさに沿うように現場で調整が可能なので、掘進機が通過後、直ちに覆工体と坑壁との間に可撓性ジョイント構造を構築することが可能となる。   According to the flexible joint structure of the present invention, since it can be adjusted on-site so as to follow the size of the gap between the lining body and the mine wall, the lining body and the mine wall immediately after the excavator passes. It is possible to construct a flexible joint structure between the two.

以下、本発明の好ましい実施形態について図面を用いて詳細に説明する。
図１は、本発明の実施形態に係る可撓性ジョイント構造１の鉛直断面図であり、図２は、図１のａ部拡大図である。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a vertical sectional view of a flexible joint structure 1 according to an embodiment of the present invention, and FIG. 2 is an enlarged view of part a in FIG.

図１及び図２に示すように、可撓性ジョイント構造１は、トンネル２と当該トンネル２を掘削するシールド機を発進又は到達させるための立坑３との接続部４において、トンネル２内に敷設されたセグメント５と立坑３の坑壁６との間に相対変位が生じた場合にセグメント５と坑壁６との間の隙間９から立坑３内への水の流入を防止するものである。具体的には、隙間９を跨ぐようにセグメント５と立坑３の坑壁６とに固定される環状の止水部材８と、止水部材８よりも立坑３の内側よりに設けられるとともに、セグメント５と立坑３の坑壁６とに固定され、止水部材８よりも剛性が高く、かつ、可撓性を有する環状のバックアップ部材７とを備える。   As shown in FIGS. 1 and 2, the flexible joint structure 1 is laid in the tunnel 2 at a connection portion 4 between the tunnel 2 and a shaft 3 for starting or reaching a shield machine for excavating the tunnel 2. When relative displacement occurs between the segment 5 and the pit wall 6 of the shaft 3, the inflow of water into the shaft 3 from the gap 9 between the segment 5 and the pit wall 6 is prevented. Specifically, an annular water-stopping member 8 fixed to the segment 5 and the pit wall 6 of the shaft 3 so as to straddle the gap 9, and provided on the inner side of the shaft 3 than the water-stopping member 8, the segment 5 and the shaft wall 6 of the shaft 3, and has an annular backup member 7 having higher rigidity than the water stop member 8 and having flexibility.

止水部材８は、径方向に伸縮自在となるように蛇腹状に折りたたんだ状態で、内周側縁部８ａがセグメント５に、外周側縁部８ｂが坑壁６にそれぞれ第一の固定手段１０で固定されている。また、セグメント５及び坑壁６と接する内周側縁部８ａ及び外周側縁部８ｂの接触面には、接着剤が塗布されているので、止水部材８は、セグメント５及び坑壁６に密着している。さらに、第一の固定手段１０は、環状の鋼製枠１０ａと、この鋼製枠１０ａをセグメント５及び坑壁６に固定するボルト１０ｂとから構成されており、ボルト１０ｂを締め付けることによって、鋼製枠１０ａを介して止水部材８の両縁部８ａ、８ｂを全周にわたって均等にそれぞれセグメント５、坑壁６に押さえつけるので、止水部材８の内周側縁部８ａとセグメント５との間、外周側縁部８ｂと坑壁６の間から漏水することは無い。   The water stop member 8 is a first fixing means in which the inner peripheral edge 8a is attached to the segment 5 and the outer peripheral edge 8b is attached to the well wall 6 in a state of being folded in a bellows shape so as to be expandable and contractable in the radial direction. 10 is fixed. In addition, since the adhesive is applied to the contact surfaces of the inner peripheral side edge 8a and the outer peripheral side edge 8b that are in contact with the segment 5 and the well wall 6, the water blocking member 8 is attached to the segment 5 and the well wall 6. It is in close contact. Further, the first fixing means 10 is composed of an annular steel frame 10a and a bolt 10b for fixing the steel frame 10a to the segment 5 and the well wall 6, and by tightening the bolt 10b, Since both edges 8a and 8b of the water-stopping member 8 are equally pressed against the segment 5 and the well wall 6 over the entire circumference via the frame 10a, the inner peripheral side edge 8a of the water-stopping member 8 and the segment 5 In the meantime, no water leaks from between the outer peripheral edge 8b and the pit wall 6.

止水部材８は、例えば、ゴム製の止水シートからなり、本実施形態においては、エバブリッド（製品名：登録商標、株式会社クラレ製）を用いた。この止水部材８は、地震によりセグメント５と坑壁６との間に相対変位が生ずると、蛇腹状に折りたたんだ部分がこれに追随して変形する。   The water stop member 8 is made of, for example, a rubber water stop sheet. In the present embodiment, Evabrid (product name: registered trademark, Kuraray Co., Ltd.) is used. When a relative displacement occurs between the segment 5 and the pit wall 6 due to the earthquake, the water-stopping member 8 is deformed following the bellows-like folded portion.

バックアップ部材７は、径方向及び軸方向に伸縮自在となるように蛇腹状に折りたたんだ状態で、止水部材８よりも立坑３内側よりに設けられている。また、バックアップ部材７は、内周側縁部７ａがセグメント５上の第一の固定手段１０の鋼製枠１０ａに、外周側縁部７ｂが坑壁６上の第一の固定手段１０の鋼製枠１０ａに、それぞれ第二の固定手段１１で固定されている。   The backup member 7 is provided on the inner side of the shaft 3 from the water stop member 8 in a state of being folded in a bellows shape so as to be expandable and contractable in the radial direction and the axial direction. Further, the backup member 7 has an inner peripheral edge 7 a on the steel frame 10 a of the first fixing means 10 on the segment 5 and an outer peripheral edge 7 b on the steel of the first fixing means 10 on the pit wall 6. It is fixed to the frame 10a by the second fixing means 11, respectively.

第二の固定手段１１は、環状の鋼製枠１１ａと、この鋼製枠１１ａを第一の固定手段１０に固定するボルト１１ｂとから構成される。ボルト１１ｂを締め付けることによって、鋼製枠１１ａを介してバックアップ部材７の両縁部７ａ、７ｂを全周にわたって均等に第一の固定手段１０に押しつけて固定する。   The second fixing means 11 includes an annular steel frame 11 a and a bolt 11 b that fixes the steel frame 11 a to the first fixing means 10. By tightening the bolt 11b, both edges 7a, 7b of the backup member 7 are evenly pressed and fixed to the first fixing means 10 over the entire circumference via the steel frame 11a.

このバックアップ部材７は、地震によりセグメント５と坑壁６との間に相対変位が生ずると、蛇腹状に折りたたんだ部分がこれに追随して変形する。   When a relative displacement occurs between the segment 5 and the pit wall 6 due to an earthquake, the back-up member 7 is deformed following a bellows-like folded portion.

バックアップ部材７は、例えば、ワイヤーメッシュを用いた。このバックアップ部材７は、高い剛性を有しているため、大深度における水圧を受けても破損することはない。   As the backup member 7, for example, a wire mesh is used. Since this backup member 7 has high rigidity, even if it receives the water pressure in a large depth, it does not break.

図３は、接続部に相対変位が生じた状態を示す図である。図３に示すように、地震等により、セグメント５と坑壁６との間に相対変位が生じても、止水部材８及びバックアップ部材７の蛇腹状に折りたたんだ部分がこれに追随して変形するので、止水部材８及びバックアップ部材７は破損しない。また、セグメント５と坑壁６との間の隙間９内を地下水が通過しても、止水部材８により、地下水が立坑３内に流入することを防止する。   FIG. 3 is a diagram illustrating a state in which relative displacement has occurred in the connection portion. As shown in FIG. 3, even if a relative displacement occurs between the segment 5 and the pit wall 6 due to an earthquake or the like, the folded portions of the water stop member 8 and the backup member 7 are deformed following this. Therefore, the water stop member 8 and the backup member 7 are not damaged. Further, even if groundwater passes through the gap 9 between the segment 5 and the pit wall 6, the water stop member 8 prevents the groundwater from flowing into the shaft 3.

また、この隙間９を通過した被圧地下水の圧力が止水部材８に作用すると、止水部材８が伸張してバックアップ部材７に接触し、このバックアップ部材７が止水部材８を支持してその圧力を負担する。したがって、止水部材８が被圧地下水の圧力によって破断することは無い。   Further, when the pressure of the pressurized groundwater that has passed through the gap 9 acts on the water stop member 8, the water stop member 8 expands and contacts the backup member 7, and the backup member 7 supports the water stop member 8. Bear the pressure. Therefore, the water stop member 8 is not broken by the pressure of the groundwater under pressure.

以上の構成からなる可撓性ジョイント構造１によれば、地震等でセグメント５と坑壁６との間に相対変位が生じて、セグメント５と坑壁６との間の隙間９を地下水が通過しても、止水部材８により、立坑３内への地下水の流入を防止することができる。また、この隙間９を通過した被圧地下水の圧力が止水部材８に作用しても、止水部材８が伸張してバックアップ部材７に接触し、このバックアップ部材７が止水部材８を支持してその圧力を負担する。したがって、止水部材８が被圧地下水の圧力によって破断することは無く、確実に止水性を保持できる。   According to the flexible joint structure 1 configured as described above, relative displacement occurs between the segment 5 and the pit wall 6 due to an earthquake or the like, and the groundwater passes through the gap 9 between the segment 5 and the pit wall 6. Even so, the water stop member 8 can prevent the inflow of groundwater into the shaft 3. Further, even if the pressure of groundwater that has passed through the gap 9 acts on the water stop member 8, the water stop member 8 expands and contacts the backup member 7, and the backup member 7 supports the water stop member 8. And bear the pressure. Therefore, the water stop member 8 is not broken by the pressure of the groundwater under pressure, and the water stop can be reliably maintained.

また、バックアップ部材７のワイヤーメッシュや止水部材８のゴム製の止水シート等は、一般的な材料なので、入手性に優れている。   Moreover, since the wire mesh of the backup member 7 and the rubber waterproofing sheet of the waterproofing member 8 are general materials, they are excellent in availability.

なお、本実施形態においては、セグメント５及び坑壁６の一部に切り欠き部を設けて、バックアップ部材７及び止水部材８をその切り欠き部内のセグメント５及び坑壁６に取り付ける場合について説明したが、これに限定されるものではなく、図４に示すように、切り欠き部を設けること無く、バックアップ部材７及び止水部材８を直接、セグメント５の端面及び坑壁６の内周面に取り付けてもよい。   In addition, in this embodiment, the case where a notch part is provided in a part of the segment 5 and the well wall 6 and the backup member 7 and the water stop member 8 are attached to the segment 5 and the well wall 6 in the notch part will be described. However, the present invention is not limited to this, and as shown in FIG. 4, the backup member 7 and the water stop member 8 are directly connected to the end surface of the segment 5 and the inner peripheral surface of the well wall 6 without providing a notch. You may attach to.

なお、本実施形態においては、覆工体としてセグメント５を用いた場合について説明したが、これに限定されるものではなく、推進管を用いてもよい。すなわち、本発明はシールド機による掘削にて構築されたトンネル２だけでなく、推進機による掘削にて構築されたトンネル２にも適用可能である。   In addition, in this embodiment, although the case where the segment 5 was used as a lining body was demonstrated, it is not limited to this, You may use a propulsion pipe. That is, the present invention can be applied not only to the tunnel 2 constructed by excavation by a shield machine but also to the tunnel 2 constructed by excavation by a propulsion device.

本発明の実施形態に係る可撓性ジョイント構造の鉛直断面図である。It is a vertical sectional view of a flexible joint structure according to an embodiment of the present invention. 図１のａ部拡大図である。It is the a section enlarged view of FIG. 接続部に相対変位が生じた状態を示す図である。It is a figure which shows the state which the relative displacement produced in the connection part. 本発明の他の実施例を示す図である。It is a figure which shows the other Example of this invention.

符号の説明Explanation of symbols

１ 可撓性ジョイント構造
２ トンネル
３ 立坑
４ 接続部
５ セグメント
６ 坑壁
７ バックアップ部材
７ａ 内周側縁部
７ｂ 外周側縁部
８ 止水部材
８ａ 内周側縁部
８ｂ 外周側縁部
９ 隙間
１０ 第一の固定手段
１０ａ 鋼製枠
１０ｂ ボルト
１１ 第二の固定手段
１１ａ 鋼製枠
１１ｂ ボルト DESCRIPTION OF SYMBOLS 1 Flexible joint structure 2 Tunnel 3 Vertical shaft 4 Connection part 5 Segment 6 Tunnel wall 7 Backup member 7a Inner peripheral side edge part 7b Outer peripheral side edge part 8 Water stop member 8a Inner peripheral side edge part 8b Outer peripheral side edge part 9 Crevice 10 First fixing means 10a Steel frame 10b Bolt 11 Second fixing means 11a Steel frame 11b Bolt

Claims (4)

トンネル内に敷設された覆工体と立坑の坑壁との接続部に相対変位が生じた場合に当該覆工体と当該坑壁との間の隙間を通過して当該立坑内へ水が流入するのを防止する可撓性ジョイント構造であって、
前記隙間を跨ぐように前記覆工体と前記坑壁とに固定される環状の止水部材と、
前記止水部材よりも前記立坑内側よりに設けられるとともに、前記隙間を跨ぐように前記覆工体と前記坑壁とに固定され、前記止水部材よりも剛性が高く、かつ、可撓性を有する環状のバックアップ部材とを備えることを特徴とする可撓性ジョイント構造。 When relative displacement occurs at the connection between the lining body laid in the tunnel and the pit wall, water flows into the shaft through the gap between the lining body and the pit wall. A flexible joint structure that prevents
An annular water stop member fixed to the lining body and the pit wall so as to straddle the gap;
It is provided on the inner side of the shaft rather than the water stop member, and is fixed to the cover body and the wall so as to straddle the gap, and has higher rigidity and flexibility than the water stop member. A flexible joint structure comprising an annular backup member. 前記止水部材及び前記バックアップ部材は、径方向及び軸方向に伸縮自在となるように蛇腹状に折りたたまれていることを特徴とする請求項１に記載の可撓性ジョイント構造。   The flexible joint structure according to claim 1, wherein the water stop member and the backup member are folded in a bellows shape so as to be expandable and contractable in a radial direction and an axial direction. 前記止水部材は、止水シートからなることを特徴とする請求項１又は２に記載の可撓性ジョイント構造。   The flexible joint structure according to claim 1, wherein the water stop member is formed of a water stop sheet. 前記バックアップ部材は、ワイヤーメッシュからなることを特徴とする請求項１又は２に記載の可撓性ジョイント構造。   The flexible joint structure according to claim 1, wherein the backup member is made of a wire mesh.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014025300A (en) * 2012-07-30 2014-02-06 Kajima Corp Water cut-off structure for boxy body joint part
JP2016172992A (en) * 2015-03-17 2016-09-29 株式会社熊谷組 Pipe installation device
JP2017002718A (en) * 2016-09-27 2017-01-05 鹿島建設株式会社 Water cutoff structure of box body joint part
CN108119161A (en) * 2017-12-15 2018-06-05 西南交通大学 Structure is just built in the prefabricated flexible joint structure of across active breaking belt tunnel-liner and tunnel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000320293A (en) * 1999-05-11 2000-11-21 Bridgestone Corp Flexible joint

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000320293A (en) * 1999-05-11 2000-11-21 Bridgestone Corp Flexible joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014025300A (en) * 2012-07-30 2014-02-06 Kajima Corp Water cut-off structure for boxy body joint part
JP2016172992A (en) * 2015-03-17 2016-09-29 株式会社熊谷組 Pipe installation device
JP2017002718A (en) * 2016-09-27 2017-01-05 鹿島建設株式会社 Water cutoff structure of box body joint part
CN108119161A (en) * 2017-12-15 2018-06-05 西南交通大学 Structure is just built in the prefabricated flexible joint structure of across active breaking belt tunnel-liner and tunnel

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