JP6355475B2 - Support structure for fixture and tunnel lining formwork - Google Patents

Support structure for fixture and tunnel lining formwork Download PDF

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JP6355475B2
JP6355475B2 JP2014162168A JP2014162168A JP6355475B2 JP 6355475 B2 JP6355475 B2 JP 6355475B2 JP 2014162168 A JP2014162168 A JP 2014162168A JP 2014162168 A JP2014162168 A JP 2014162168A JP 6355475 B2 JP6355475 B2 JP 6355475B2
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fixing member
formwork
fixing
male screw
end portion
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JP2016037777A (en
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賢一 文村
賢一 文村
敦史 古田
敦史 古田
重周 岸
重周 岸
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Taisei Corp
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Description

本発明は、トンネル覆工用型枠等を支持するための固定具、トンネル覆工用型枠の支持構造に関する。   The present invention relates to a fixture for supporting a tunnel lining formwork and the like, and a support structure for a tunnel lining formwork.

トンネル形成技術として、NATM(New Austrian Tunneling Method)工法や矢板工法があり、現在はNATM工法が採用されている。
NATM工法においては、地山に形成した掘削孔の内周面は、一次覆工体、二次覆工体によって覆工する。これには、まず、掘削孔の内周面に、コンクリートを吹き付けて一次覆工体を形成する。次いで、一次覆工体の内周側に間隔をあけて型枠を設置する。そして、型枠と一次覆工体との間にコンクリートを打設充填することによって、二次覆工体を形成する。二次覆工体の形成後、型枠を撤去する。
As a tunnel forming technique, there are a NATM (New Australian Tunneling Method) method and a sheet pile method, and the NATM method is currently employed.
In the NATM construction method, the inner peripheral surface of the excavation hole formed in the ground is covered with a primary lining body and a secondary lining body. For this, first, concrete is sprayed on the inner peripheral surface of the excavation hole to form a primary lining body. Subsequently, a formwork is installed at an interval on the inner peripheral side of the primary lining body. Then, a secondary lining body is formed by placing and filling concrete between the mold and the primary lining body. After forming the secondary lining body, the formwork is removed.

特許文献1には、このようなNATM工法において、掘削孔内における型枠の支持及び搬送にガントリーを用いる構成が開示されている。このガントリーは、掘削孔内に設置した型枠と一次覆工体との間にコンクリートを打設充填し、さらに打設したコンクリートが硬化して所定の強度が発現するまで間、型枠を支持する。さらに、ガントリーは、コンクリートの硬化後に、取り外した型枠を搭載し、掘削孔の前方に搬送する。   Patent Document 1 discloses a configuration in which a gantry is used for supporting and transporting a mold in a borehole in such a NATM method. This gantry is filled with concrete between the formwork installed in the excavation hole and the primary lining body, and then supports the formwork until the placed concrete hardens and develops the specified strength. To do. Further, after the concrete is hardened, the gantry is loaded with the removed formwork and conveyed to the front of the excavation hole.

しかし、ガントリーを用いたNATM工法においては、コンクリートが硬化して所定の強度が発現するまでは、ガントリーを型枠から取り外し、前方に移動させて次の打設作業に移ることができなかった。このため、施工の迅速化には限界があった。一方、施工の迅速化のため、型枠の取り外しを早期に行うと、覆工体の品質低下に繋がるという問題があった。   However, in the NATM construction method using a gantry, it was impossible to remove the gantry from the formwork and move it forward until the concrete was hardened and a predetermined strength was developed. For this reason, there was a limit to speeding up the construction. On the other hand, if the formwork is removed at an early stage in order to speed up the construction, there is a problem that the quality of the lining body is lowered.

特開2008−308855号公報JP 2008-308855 A

本発明の目的は、覆工体の品質を確保しつつ、施工の迅速化を図ることのできる固定具、トンネル覆工用型枠の支持構造を提供することである。   The objective of this invention is providing the support structure of the fixing tool and the tunnel lining formwork which can aim at speeding up of construction, ensuring the quality of a lining body.

本発明は、上記課題を解決するため、以下の手段を採用する。
すなわち、本発明は、地山に形成された掘削孔の内方に着脱可能な型枠装置を支持固定する固定具であって、一端側が、前記地山側に固定され、他端側が前記掘削孔の内方に突出するとともに、前記型枠装置を貫通して設けられる定着部材と、前記型枠装置を貫通した前記定着部材の他端側に着脱可能に設けられ、前記型枠装置を前記掘削孔の内方から係止する係止部材と、を備え、前記係止部材の着脱により、前記型枠装置を着脱可能であることを特徴とする。
The present invention employs the following means in order to solve the above problems.
That is, the present invention is a fixture for supporting and fixing a formwork device that is detachable to the inside of an excavation hole formed in a natural ground, one end side being fixed to the natural ground side, and the other end side being the excavation hole. A fixing member that protrudes inwardly, and is provided detachably on the other end side of the fixing member that passes through the formwork device, and digs the formwork device. comprising a locking member for locking from the inside of the hole, and the attachment and detachment of the locking member, and wherein the detachable der Rukoto the formwork device.

このような固定具を用い、掘削孔の内方に間隔をあけて型枠装置を支持することで、型枠装置と掘削孔との間に二次覆工コンクリートを打設した際に、二次覆工コンクリートの圧力や荷重を支えることができる。したがって、ガントリーを用いることなく、型枠装置の支持を行うことができる。また、ガントリーを用いた場合であっても、型枠装置は固定具によって支持されているので、二次覆工コンクリートが完全に硬化しなくとも、ガントリーを型枠装置から取り外すことが可能となる。   By using such a fixture and supporting the formwork device with an interval inside the excavation hole, when the secondary lining concrete is placed between the formwork device and the excavation hole, It can support the pressure and load of the next lining concrete. Therefore, the mold apparatus can be supported without using a gantry. Even when a gantry is used, since the formwork apparatus is supported by a fixture, the gantry can be removed from the formwork apparatus even if the secondary lining concrete is not completely cured. .

また、前記定着部材の先端部に、雄ネジ部が設けられ、前記係止部材は、前記雄ネジ部に螺合する雌ネジ部を有するようにしてもよい。
このような構成によれば、定着部の先端部に設けられた雄ネジ部に、係止部材の雌ネジ部を螺合させることによって、係止部材を定着部材に対し、容易に着脱することができる。これによって、型枠装置の設置作業、および型枠装置の取り外し作業を効率よく行うことが可能となる。また、取り外した係止部材は、繰り返し使用することが可能となるので、コスト低減を図ることができる。
In addition, a male screw portion may be provided at the tip of the fixing member, and the locking member may have a female screw portion that is screwed into the male screw portion.
According to such a configuration, the locking member can be easily attached to and detached from the fixing member by screwing the female screw portion of the locking member into the male screw portion provided at the tip of the fixing portion. Can do. This makes it possible to efficiently perform the installation work of the formwork apparatus and the removal work of the formwork apparatus. Further, since the removed locking member can be used repeatedly, the cost can be reduced.

また、前記定着部材の先端部が挿入される挿入穴と、前記挿入穴に挿入された前記定着部材の先端部を固定する固定部材と、前記雄ネジ部と、を備えた雄ネジ部材が前記定着部材の先端部に着脱可能に設けられているようにしてもよい。
このような構成によれば、雄ネジ部材の挿入穴に定着部材の先端部を挿入した状態で、固定部材により定着部材の先端部を固定することによって、雄ネジ部材を定着部材の先端部に装着することができる。
そして、この雄ネジ部材の雄ネジ部に、係止部材の雌ネジ部を螺合させることで、係止部材の定着部材に対する着脱を容易に行うことができる。
しかも、固定部材による定着部材の先端部の固定を解除すれば、定着部材の先端部を雄ネジ部材の挿入穴から抜くことができるので、定着部材から雄ネジ部材を容易に取り外すことができる。これにより、二次覆工コンクリートの打設充填後、型枠装置を取り外す際に、係止部材とともに固定部材を容易に取り外すことができる。したがって、これら係止部材および固定部材を、繰り返し使用することができ、コスト低減を図ることができる。
The male screw member comprising: an insertion hole into which the distal end portion of the fixing member is inserted; a fixing member that fixes the distal end portion of the fixing member inserted into the insertion hole; and the male screw portion. The fixing member may be detachably provided at the front end portion.
According to such a configuration, with the distal end portion of the fixing member inserted into the insertion hole of the male screw member, the distal end portion of the fixing member is fixed by the fixing member, whereby the male screw member is attached to the distal end portion of the fixing member. Can be installed.
Then, by engaging the female screw portion of the locking member with the male screw portion of the male screw member, the locking member can be easily attached to and detached from the fixing member.
In addition, if the fixing member is released from the fixing member tip, the fixing member tip can be removed from the insertion hole of the male screw member, so that the male screw member can be easily removed from the fixing member. Thereby, when the formwork apparatus is removed after placing and filling the secondary lining concrete, the fixing member can be easily removed together with the locking member. Therefore, these locking members and fixing members can be used repeatedly, and the cost can be reduced.

前記係止部材は、前記定着部材の外周部で前記型枠装置に突き当たるとともに、前記定着部材の先端部が貫通するベース部材と、前記ベース部材を貫通した前記定着部材の先端部の前記雄ネジ部に螺合する前記雌ネジ部を有したナットと、を備え、前記ベース部材は、前記定着部材が貫通する部分に、前記型枠装置を貫通して前記地山側へ突出し、その外径が該突出方向に向かって縮小する円錐台形状の突部を備えるようにしてもよい。
このように、定着部材の先端部がベース部材を貫通するので、ベース部材は、定着部材
の外周側で型枠装置に突き当たる。したがって、定着部材および係止部材から作用する応
力が、ベース部材によって分散して型枠装置に作用する。したがって、応力集中を避ける
ことができる。
The locking member abuts against the mold apparatus at the outer peripheral portion of the fixing member, and a base member through which the front end portion of the fixing member passes, and the male screw at the front end portion of the fixing member that passes through the base member A nut having an internal thread portion that is screwed into a portion, and the base member penetrates the formwork device at a portion through which the fixing member penetrates and protrudes toward the ground mountain side, and has an outer diameter. it may be so that with a projection of the frustoconical reduced toward the protruding direction.
Thus, since the front-end | tip part of a fixing member penetrates a base member, a base member strikes a formwork apparatus on the outer peripheral side of a fixing member. Accordingly, the stress acting from the fixing member and the locking member is dispersed by the base member and acts on the mold apparatus. Therefore, stress concentration can be avoided.

また、前記定着部材の先端部が、照明装置又は換気設備を吊り下げる引き止め部を構成してもよい。   Moreover, the front-end | tip part of the said fixing member may comprise the securing part which suspends an illuminating device or ventilation equipment.

また、本発明は、トンネル覆工用型枠の支持構造であって、地山に掘削された掘削孔の内部に配置され、前記掘削孔の内周面に対向した型枠面を有する型枠装置と、前記型枠装置を固定するために、その一端側が前記地山側に固定され、他端側が前記型枠装置に係止された上記したような固定具と、を備えていることを特徴とする。   The present invention also provides a tunnel lining formwork support structure, which is disposed inside a drilling hole excavated in a natural ground and has a formwork surface facing the inner peripheral surface of the excavation hole. In order to fix the formwork device, one end side of the device is fixed to the ground mountain side, and the other end side is fixed to the formwork device as described above. And

本発明によれば、覆工体の品質を確保しつつ、施工の迅速化を図ることができる。   According to the present invention, it is possible to speed up the construction while ensuring the quality of the lining body.

本実施形態に係るトンネル覆工用型枠の支持構造の概念的な構成を示す断面図である。It is sectional drawing which shows the notional structure of the support structure of the tunnel lining formwork which concerns on this embodiment. 本実施形態に係る固定具の概念的な構成を示す断面図である。It is sectional drawing which shows the notional structure of the fixing tool concerning this embodiment. 固定具による型枠装置の設置工程の流れを示す図であり、定着部材を設けた状態を示す断面図である。It is a figure which shows the flow of the installation process of the formwork apparatus by a fixing tool, and is sectional drawing which shows the state which provided the fixing member. 固定具による型枠装置の設置工程の流れを示す図であり、型枠装置およびベース部材を設けた状態を示す断面図である。It is a figure which shows the flow of the installation process of the formwork apparatus by a fixing tool, and is sectional drawing which shows the state which provided the formwork apparatus and the base member. 固定具による型枠装置の設置工程の流れを示す図であり、定着部材の先端部に雄ネジ部材を設けた状態を示す断面図である。It is a figure which shows the flow of the installation process of the formwork apparatus by a fixing tool, and is sectional drawing which shows the state which provided the external thread member in the front-end | tip part of the fixing member. 複数の型枠装置を用いたトンネルの覆工方法を概念的に示す側断面図である。It is a sectional side view which shows notionally the tunnel lining method using a some formwork apparatus. 固定具の他の例を示す概念的な断面図である。It is a conceptual sectional view showing other examples of a fixture. 固定具のさらに他の例を示す断面図である。It is sectional drawing which shows the further another example of a fixing tool.

以下、本発明による固定具、トンネル覆工用型枠の支持構造を実施するための形態について、図面に基づいて説明する。   EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the support structure of the fixing tool by this invention and a tunnel lining formwork is demonstrated based on drawing.

図1は、本実施形態に係るトンネル覆工用型枠の支持構造の概念的な構成を示す断面図である。
図1に示すように、トンネルTは、NATM工法によって施工される。
すなわち、トンネルTを構築するには、まず、地山Gを削岩機や発破により掘削し、掘削孔Hを形成する。そして、掘削孔Hの内周面にコンクリートを吹き付け、このコンクリートを硬化させることで、一次覆工コンクリート11を形成する。
FIG. 1 is a sectional view showing a conceptual configuration of a support structure for a tunnel lining form according to the present embodiment.
As shown in FIG. 1, the tunnel T is constructed by the NATM construction method.
That is, in order to construct the tunnel T, first, the natural ground G is excavated by a rock drill or blasting to form the excavation hole H. And concrete is sprayed on the internal peripheral surface of the excavation hole H, and the primary lining concrete 11 is formed by hardening this concrete.

また、一次覆工コンクリート11を通して、掘削孔Hから周囲の地山Gに、複数本のロックボルト12を放射状に打ち込む。この場合、掘削孔Hの内周面には、トンネルTの軸線方向に間隔をあけて、図示しない鋼製支保工を設置してもよい。   Further, a plurality of rock bolts 12 are driven radially from the excavation hole H into the surrounding natural ground G through the primary lining concrete 11. In this case, a steel support (not shown) may be installed on the inner peripheral surface of the excavation hole H with an interval in the axial direction of the tunnel T.

その後、掘削孔Hの内周面を覆う一次覆工コンクリート11の内周側に、後述する型枠装置20を設置する。次いで、型枠装置20と一次覆工コンクリート11との間に、コンクリートを打設充填し、このコンクリートを硬化させることで二次覆工コンクリート13を形成する。二次覆工コンクリート13について所定の強度が発現した後、型枠装置20を撤去することで、トンネルTの覆工体15が構築される。   Then, the mold apparatus 20 mentioned later is installed in the inner peripheral side of the primary lining concrete 11 which covers the inner peripheral surface of the excavation hole H. Next, concrete is cast and filled between the formwork device 20 and the primary lining concrete 11, and the secondary lining concrete 13 is formed by curing the concrete. After the predetermined strength is developed for the secondary lining concrete 13, the lining body 15 of the tunnel T is constructed by removing the formwork device 20.

このようにして構築された覆工体15は、一次覆工コンクリート11、ロックボルト12、二次覆工コンクリート13からなる。一次覆工コンクリート11および二次覆工コンクリート13は、地山Gに打ち込まれた複数本のロックボルト12により、地山Gと一体化している。   The lining body 15 thus constructed is composed of the primary lining concrete 11, the lock bolt 12, and the secondary lining concrete 13. The primary lining concrete 11 and the secondary lining concrete 13 are integrated with the natural ground G by a plurality of lock bolts 12 driven into the natural ground G.

掘削孔H内に設置される型枠装置20は、掘削孔Hが連続する方向に沿って、所定長を有している。この型枠装置20は、掘削孔Hの内周面の一次覆工コンクリート11に対し、掘削孔Hの径方向に間隔を空けて対向した型枠面20fを有している。   The formwork device 20 installed in the excavation hole H has a predetermined length along the direction in which the excavation holes H are continuous. This formwork device 20 has a formwork surface 20f opposed to the primary lining concrete 11 of the inner peripheral surface of the excavation hole H with a gap in the radial direction of the excavation hole H.

この型枠装置20は、掘削孔Hの周方向に沿って複数連結された型枠部材21を備えている。各型枠部材21は、断面円弧状をなしている。型枠部材21は、掘削孔Hの周方向で隣接する他の型枠部材21と、ヒンジ22を介して回動自在に連結されている。型枠装置20は、隣接する型枠部材21どうしの連結部分を、ヒンジ22で回動させることで、型枠装置20を展開して拡径させたり、型枠装置20を折り畳んで縮径させたりすることができる。   The formwork device 20 includes a formwork member 21 connected in a plurality along the circumferential direction of the excavation hole H. Each mold member 21 has a circular arc shape in cross section. The mold member 21 is rotatably connected to another mold member 21 adjacent in the circumferential direction of the excavation hole H via a hinge 22. The formwork device 20 rotates the connecting portion of the adjacent formwork members 21 by the hinge 22 so that the formwork device 20 is expanded and expanded in diameter, or the formwork device 20 is folded and reduced in diameter. Can be.

各型枠部材21は、掘削孔Hの周方向で隣接する他の型枠部材21との連結部分に、ヒンジ22に対して内周側に、ジャッキ受圧部23が形成されている。周方向で隣接する型枠部材21、21のジャッキ受圧部23、23間には、ジャッキ24を着脱自在に介在させることができるようになっている。ジャッキ24によりジャッキ受圧部23、23どうしが互いに離間する方向の押圧力を付与することで、型枠装置20は、展開して拡径した状態で維持される。   Each mold member 21 is formed with a jack pressure receiving portion 23 on the inner peripheral side with respect to the hinge 22 at a connection portion with another mold member 21 adjacent in the circumferential direction of the excavation hole H. A jack 24 can be detachably interposed between the jack pressure receiving portions 23 and 23 of the mold members 21 and 21 adjacent in the circumferential direction. By applying the pressing force in the direction in which the jack pressure receiving portions 23, 23 are separated from each other by the jack 24, the formwork device 20 is maintained in a state where it is expanded and expanded in diameter.

なお、型枠装置20の両端部に位置する型枠部材21Dは、掘削孔Hの周方向の一端側のみが他の型枠部材21に連結され、掘削孔Hの周方向の他端側には、掘削孔Hの底面14に接地する接地面21fを有している。
固定具40は、型枠装置20の周方向に間隔を空けて複数箇所に設置しても良い。
In addition, as for the mold member 21D located in the both ends of the mold apparatus 20, only the one end side of the excavation hole H in the circumferential direction is connected to the other mold member 21, and the other end side of the excavation hole H in the circumferential direction is connected. Has a ground contact surface 21f that contacts the bottom surface 14 of the excavation hole H.
The fixtures 40 may be installed at a plurality of locations at intervals in the circumferential direction of the formwork device 20.

図2は、固定具40の構成を示す断面図である。
図2に示すように、固定具40は、地山G側に定着された線状または棒状の定着部材41と、定着部材41の先端部41sを型枠装置20に係止させる係止部材42と、を備えている。
FIG. 2 is a cross-sectional view showing the configuration of the fixture 40.
As shown in FIG. 2, the fixture 40 includes a linear or rod-like fixing member 41 fixed on the natural ground G side, and a locking member 42 that locks the tip portion 41 s of the fixing member 41 to the mold apparatus 20. And.

定着部材41は、例えば鋼製のロックボルトからなり、地山Gに穿孔された穴内に挿入されて定着されている。定着部材41の先端部41sは、掘削孔Hの内周面から掘削孔Hの内方に突出している。   The fixing member 41 is made of, for example, a steel lock bolt, and is fixed by being inserted into a hole drilled in the natural ground G. The front end 41 s of the fixing member 41 protrudes inward of the excavation hole H from the inner peripheral surface of the excavation hole H.

定着部材41の先端部41sには、外周面にネジ溝(雄ネジ部)43nが形成された雄ネジ部材43が設けられている。定着部材41の先端部41sは、雄ネジ部材43に対し、着脱可能に固定されている。このため、雄ネジ部材43の一端部には、定着部材41の先端部41sが挿入される挿入穴43hが形成されている。この挿入穴43hに向けて雄ネジ部材43の外周面から貫通する雌ネジ穴43mが複数形成されている。それぞれの雌ネジ穴43mには、イモネジ43cがねじ込まれるようになっている。
これらイモネジ43cの先端部が、挿入穴43hに挿入された定着部材41の先端部41sに押し付けられることによって、定着部材41の先端部41sに対して雄ネジ部材43を固定できるようになっている。
A male screw member 43 having a thread groove (male screw portion) 43n formed on the outer peripheral surface is provided at the tip portion 41s of the fixing member 41. The front end 41 s of the fixing member 41 is detachably fixed to the male screw member 43. For this reason, an insertion hole 43 h into which the distal end portion 41 s of the fixing member 41 is inserted is formed at one end portion of the male screw member 43. A plurality of female screw holes 43m penetrating from the outer peripheral surface of the male screw member 43 are formed toward the insertion hole 43h. The female screw 43c is screwed into each female screw hole 43m.
The male screw member 43 can be fixed to the distal end portion 41 s of the fixing member 41 by pressing the distal end portion of the female screw 43 c against the distal end portion 41 s of the fixing member 41 inserted into the insertion hole 43 h. .

なお、イモネジ43cに替えて、固定部材として通常のネジを用いてもよい。また、定着部材41の先端部41sに孔あるいは窪みが設けられ、イモねじ43c(固定部材)の先端部が孔あるいは窪みに嵌る構成としてもよい。   It should be noted that a normal screw may be used as the fixing member in place of the female screw 43c. Further, a hole or a recess may be provided in the tip portion 41s of the fixing member 41, and the tip portion of the female screw 43c (fixing member) may be fitted in the hole or the recess.

係止部材42は、ベース部材44と、ナット45と、を備えている。   The locking member 42 includes a base member 44 and a nut 45.

ベース部材44は、第一平板部44aと、第一平板部44aの両側から立ち上がる側板部44b、44bと、第一平板部44aに間隔をあけて平行に設けられた第二平板部44cと、を有している。これら第一平板部44a、側板部44b、44b、第二平板部44cにより、ベース部材44は、側面視角筒状をなしている。
第一平板部44aには、ベース部材44の外周側に向けて突出する突部44tが形成されている。突部44tは、第一平板部44a側から離間するにしたがってその外径が次第に縮小する円錐台形状をなしている。この突部44tおよび第一平板部44aには、定着部材41を挿通させる挿通孔44hが貫通形成されている。
また、第二平板部44cには、挿通孔44hと対向する位置に、雄ネジ部材43を挿通させる貫通孔44kが形成されている。
The base member 44 includes a first flat plate portion 44a, side plate portions 44b and 44b rising from both sides of the first flat plate portion 44a, and a second flat plate portion 44c provided in parallel to the first flat plate portion 44a with a space therebetween. have. The base member 44 has a cylindrical shape in a side view by the first flat plate portion 44a, the side plate portions 44b and 44b, and the second flat plate portion 44c.
The first flat plate portion 44 a is formed with a protrusion 44 t that protrudes toward the outer peripheral side of the base member 44. The protrusion 44t has a truncated cone shape whose outer diameter gradually decreases as the distance from the first flat plate portion 44a side increases. An insertion hole 44h through which the fixing member 41 is inserted is formed through the protrusion 44t and the first flat plate portion 44a.
The second flat plate portion 44c is formed with a through-hole 44k through which the male screw member 43 is inserted at a position facing the insertion hole 44h.

このようなベース部材44は、第一平板部44aを型枠装置20の内周面20gに突き当てるとともに、突部44tを型枠装置20に形成された貫通孔25に挿入させて配置される。ここで、第一平板部44aは、その外形寸法が貫通孔25よりも大きく、貫通孔25の外周側で型枠装置20の内周面20gに突き当たるようになっている。   Such a base member 44 is disposed by abutting the first flat plate portion 44 a against the inner peripheral surface 20 g of the mold apparatus 20 and inserting the protrusion 44 t into the through hole 25 formed in the mold apparatus 20. . Here, the outer dimension of the first flat plate portion 44 a is larger than that of the through hole 25, and abuts against the inner peripheral surface 20 g of the mold apparatus 20 on the outer peripheral side of the through hole 25.

そして、ベース部材44には、定着部材41の先端部41sに装着された雄ネジ部材43が、貫通孔44kを通して第二平板部44cからベース部材44の外方(掘削孔Hの径方向内周側)に向けて突出するよう配置される。   Then, the male screw member 43 attached to the front end portion 41s of the fixing member 41 is attached to the base member 44 from the second flat plate portion 44c through the through hole 44k to the outside of the base member 44 (in the radial inner circumference of the excavation hole H). Side).

ナット45は、雌ネジ部45nを有し、第二平板部44cから突出した雄ネジ部材43にねじ込まれている。このナット45によって、雄ネジ部材43がベース部材44の第二平板部44cに固定されている。ここで、ナット45のねじ込み量を調整すると、雄ネジ部材43が第二平板部44cに直交する方向に変位する。   The nut 45 has a female screw portion 45n and is screwed into a male screw member 43 protruding from the second flat plate portion 44c. The male screw member 43 is fixed to the second flat plate portion 44 c of the base member 44 by the nut 45. Here, when the screwing amount of the nut 45 is adjusted, the male screw member 43 is displaced in a direction orthogonal to the second flat plate portion 44c.

次に、上記のような型枠装置20を用いたトンネルTの覆工方法について説明する。
図3〜図5は、固定具による型枠装置の設置工程の流れを示す図であり、図3は固定具の定着部材を設けた状態を示す断面図である。また、図4は、型枠装置およびベース部材を設けた状態を示す断面図である。図5は、定着部材の先端部に雄ネジ部材を設けた状態を示す断面図である。
Next, a tunnel T lining method using the above-described formwork apparatus 20 will be described.
3 to 5 are diagrams showing a flow of an installation process of the formwork device using a fixture, and FIG. Moreover, FIG. 4 is sectional drawing which shows the state which provided the formwork apparatus and the base member. FIG. 5 is a cross-sectional view showing a state in which a male screw member is provided at the tip of the fixing member.

(型枠装置設置工程)
トンネルTを覆工するには、地山Gに掘削した掘削孔H内に型枠装置20を以下のようにして設置する。
まず、地山Gに掘削孔Hを形成し、その内周面にコンクリートを吹き付けて、一次覆工コンクリート11を形成する。
その後、図3に示すように、地山Gに予め穿孔した穴に定着部材41を挿入し、モルタル等によって定着させる。定着部材41は、先端部41sを、掘削孔Hの径方向内周側に突出させる。
(Formwork device installation process)
In order to cover the tunnel T, the formwork apparatus 20 is installed in the excavation hole H excavated in the natural ground G as follows.
First, the excavation hole H is formed in the natural ground G, concrete is sprayed on the inner peripheral surface, and the primary lining concrete 11 is formed.
Thereafter, as shown in FIG. 3, the fixing member 41 is inserted into a hole previously drilled in the natural ground G and fixed by mortar or the like. The fixing member 41 causes the distal end portion 41 s to protrude toward the radially inner peripheral side of the excavation hole H.

次に、図4に示すように、掘削孔Hの内周側に型枠装置20を組み立てる。そして、型枠装置20の周方向両端部において、係止部材42のベース部材44の第一平板部44aを型枠装置20の内周面20gに突き当てるとともに、突部44tを型枠装置20に形成された貫通孔25に挿入させて配置する。このとき、掘削孔Hの内周側に突出した定着部材41の先端部41sを、ベース部材44のワイヤ挿通孔44hに挿通させ、型枠装置20の内周側に突出させる。   Next, as shown in FIG. 4, the mold apparatus 20 is assembled on the inner peripheral side of the excavation hole H. Then, at both ends in the circumferential direction of the mold apparatus 20, the first flat plate portion 44a of the base member 44 of the locking member 42 is abutted against the inner peripheral surface 20g of the mold apparatus 20, and the protrusion 44t is disposed on the mold apparatus 20. It is inserted and arranged in the through hole 25 formed in. At this time, the tip 41 s of the fixing member 41 protruding to the inner peripheral side of the excavation hole H is inserted into the wire insertion hole 44 h of the base member 44 and protrudes to the inner peripheral side of the mold apparatus 20.

そして、図5に示すように、掘削孔Hの内周側から掘削孔Hの内周側に突出した定着部材41の先端部41sに、雄ネジ部材43を取り付ける。これには、定着部材41の先端部41sを、雄ネジ部材43の挿入穴43hに挿入する。次いで、雄ネジ部材43の外周面に形成された複数の雌ネジ穴43mにイモネジ43cをねじ込み、イモネジ43cの先端部を、挿入穴43hに挿入された定着部材41の先端部41sに突き当てる。これによって、定着部材41の先端部41sに雄ネジ部材43が装着される。なお、イモネジ43cは、側面視角筒状をなしたベース部材44の開口部44xから、レンチ等の工具を挿入することによってねじ込むことができる。
装着した雄ネジ部材43は、ベース部材44の貫通孔44kを通して第二平板部44cからベース部材44の外方に突出させる。
Then, as shown in FIG. 5, a male screw member 43 is attached to the tip 41 s of the fixing member 41 that protrudes from the inner peripheral side of the excavation hole H to the inner peripheral side of the excavation hole H. For this purpose, the tip 41 s of the fixing member 41 is inserted into the insertion hole 43 h of the male screw member 43. Next, the female screw 43c is screwed into a plurality of female screw holes 43m formed on the outer peripheral surface of the male screw member 43, and the distal end portion of the female screw 43c abuts against the distal end portion 41s of the fixing member 41 inserted into the insertion hole 43h. As a result, the male screw member 43 is attached to the tip 41 s of the fixing member 41. The female screw 43c can be screwed by inserting a tool such as a wrench from the opening 44x of the base member 44 having a side-viewing rectangular tube shape.
The mounted male screw member 43 is protruded outward from the second flat plate portion 44 c through the through hole 44 k of the base member 44.

なお、ベース部材44の側板部44bに窓部などを設けて、レンチ以外の工具によってイモネジ43cなどの固定部材をねじ込む構成としてもよい。   In addition, it is good also as a structure which provides a window part etc. in the side-plate part 44b of the base member 44, and screws in fixing members, such as the potato screw 43c, with tools other than a wrench.

次に、図2に示すように、第二平板部44cから突出した雄ネジ部材43のネジ溝43nにナット45をねじ込む。
このとき、ナット45のねじ込み量を調整することによって、雄ネジ部材43が第二平板部44cに直交する方向に変位する。これによって、型枠装置20と掘削孔Hの内周面との間隔を調整することができる。さらに、ナット45のねじ込み量を調整することによって、定着部材41に付与するテンションを調整することもできる。
Next, as shown in FIG. 2, the nut 45 is screwed into the screw groove 43n of the male screw member 43 protruding from the second flat plate portion 44c.
At this time, by adjusting the screwing amount of the nut 45, the male screw member 43 is displaced in a direction orthogonal to the second flat plate portion 44c. Thereby, the space | interval of the formwork apparatus 20 and the internal peripheral surface of the excavation hole H can be adjusted. Further, the tension applied to the fixing member 41 can be adjusted by adjusting the screwing amount of the nut 45.

(二次覆工コンクリート打設工程)
このようにして、固定具40によって型枠装置20を支持して設置した後、図1に示したように、型枠装置20と一次覆工コンクリート11との間に二次覆工コンクリート13を打設する。
二次覆工コンクリート13の打設後、ナット45のねじ込み量を調整することによって、
各固定具40が支持する型枠装置20にかかる圧力や荷重を部分的に調整することもできる。
(Secondary lining concrete placing process)
In this way, after the mold apparatus 20 is supported and installed by the fixture 40, the secondary lining concrete 13 is placed between the mold apparatus 20 and the primary lining concrete 11, as shown in FIG. To cast.
By adjusting the screwing amount of the nut 45 after placing the secondary lining concrete 13,
The pressure and load applied to the formwork device 20 supported by each fixture 40 can be partially adjusted.

(型枠装置の縮径、前方への送り工程)
二次覆工コンクリート13に所定の強度が発現した後に、各固定具40において、ナット45を取り外す。
さらに、雄ネジ部材43のイモネジ43cを、側面視角筒状をなしたベース部材44の開口部44xから、レンチ等の工具を挿入することによって緩める。そして、雄ネジ部材43を、定着部材41の先端部41sから取り外す。
続いて、ベース部材44を、型枠装置20の内周面20gから取り外す。これにより、固定具40の定着部材41の先端部41sにおける型枠装置20の固定を解除することができる。
(Reducing diameter of formwork device, forward feeding process)
After the predetermined strength is developed in the secondary lining concrete 13, the nut 45 is removed from each fixture 40.
Further, the male screw 43c of the male screw member 43 is loosened by inserting a tool such as a wrench from the opening 44x of the base member 44 having a cylindrical shape in a side view. Then, the male screw member 43 is removed from the front end portion 41 s of the fixing member 41.
Subsequently, the base member 44 is removed from the inner peripheral surface 20 g of the mold apparatus 20. Thereby, fixation of the mold apparatus 20 in the front-end | tip part 41s of the fixing member 41 of the fixing tool 40 can be cancelled | released.

二次覆工コンクリート13から内周側に突出した定着部材41の先端部41sは、切断して除去してもよい。   The front end portion 41s of the fixing member 41 protruding from the secondary lining concrete 13 to the inner peripheral side may be removed by cutting.

そして、型枠装置20を構成する複数の型枠部材21を、連結部のヒンジ22で折畳み、型枠装置20を縮径させ、打設されたコンクリートから脱型させる。   And the some formwork member 21 which comprises the formwork apparatus 20 is folded by the hinge 22 of a connection part, the formwork apparatus 20 is diameter-reduced, and it demolds from the placed concrete.

縮径させた型枠装置20は、不図示のガントリーや、型枠装置20に備えた走行車輪によって、掘削孔H内に敷設されたレールに沿って移動させ、掘削孔H内で掘削方向前方に送る。また、定着部41の先端部41sから取り外した係止部材42のベース部材44およびナット45、雄ネジ部材43は、型枠装置20とともに掘削方向前方に送り、型枠装置20の再設置時に繰り返し利用することができる。
この後は、掘削方向前方の所定位置で、再び、型枠装置20を設置し、上記一連の工程を順次繰り返す。
The mold apparatus 20 having a reduced diameter is moved along a rail laid in the excavation hole H by a gantry (not shown) or a traveling wheel provided in the mold apparatus 20, and is moved forward in the excavation direction in the excavation hole H. Send to. Further, the base member 44, the nut 45, and the male screw member 43 of the locking member 42 removed from the front end portion 41s of the fixing unit 41 are sent forward together with the mold device 20 in the excavation direction, and repeatedly when the mold device 20 is reinstalled. Can be used.
Thereafter, the formwork apparatus 20 is installed again at a predetermined position in front of the excavation direction, and the above series of steps is sequentially repeated.

ここで、図6に示すように、上記型枠装置20は、複数組を用いることができる。複数の型枠装置20を用いた場合、たとえば次の工程を経る。すなわち、所定の位置に設置した第一の型枠装置20Aで二次覆工コンクリート13の打設を行っている間に、掘削方向前方に第二の型枠装置20Bを設置する。そして、第一の型枠装置20Aの位置で打設した二次覆工コンクリート13について所定の強度が発現した後、第一の型枠装置20Aを縮径する。縮径させた第一の型枠装置20Aは、第二の型枠装置20Bの位置で二次覆工コンクリート13の打設を行っていても、あるいは第二の型枠装置20Bの位置に打設された二次覆工コンクリート13について所定の強度が発現される前であっても、掘削方向前方へ移動させることができる。
このようにして、互いに前後する複数の型枠装置20間で、実施する工程を順次ずらして施工を行うことができる。なお、三組以上の型枠装置20を用いても良い。
Here, as shown in FIG. 6, the said formwork apparatus 20 can use multiple sets. When a plurality of formwork devices 20 are used, for example, the following steps are performed. That is, while the secondary lining concrete 13 is being placed by the first formwork apparatus 20A installed at a predetermined position, the second formwork apparatus 20B is installed in front of the excavation direction. And after predetermined intensity | strength expresses about the secondary lining concrete 13 cast | placed in the position of the 1st formwork apparatus 20A, the diameter of the 1st formwork apparatus 20A is reduced. The first formwork apparatus 20A having a reduced diameter is placed at the position of the second formwork apparatus 20B, even if the secondary lining concrete 13 is placed at the position of the second formwork apparatus 20B. Even before the predetermined strength is developed for the secondary lining concrete 13 provided, it can be moved forward in the excavation direction.
In this way, it is possible to perform the construction by sequentially shifting the steps to be performed between the plurality of formwork apparatuses 20 that are adjacent to each other. Three or more sets of formwork devices 20 may be used.

上記のようにして施工を行う際、各型枠装置20は、固定具40により型枠装置20を支持することによって、型枠装置20は二次覆工コンクリート13による荷重や圧力を支持することができる。したがって、固定具40を取り外し、縮径させた型枠装置20は、その掘削方向前方で二次覆工コンクリート13を支えている他の型枠装置20の下方を通過させて前方に送ることができる。   When performing the construction as described above, each formwork device 20 supports the formwork device 20 by the fixture 40, so that the formwork device 20 supports the load and pressure by the secondary lining concrete 13. Can do. Therefore, the formwork device 20 with the fixing tool 40 removed and reduced in diameter can be passed forward under the other formwork device 20 supporting the secondary lining concrete 13 in front of the excavation direction. it can.

上述したように、固定具40の定着部材41が地山Gに定着され、定着部材41の先端部41sに設けられた係止部材42により型枠装置20に支持されているので、型枠装置20は、地山Gに支持される。
これにより、型枠装置20は、ガントリー等での支持を要せずとも、二次覆工コンクリート13の荷重や圧力を支持することができる。したがって、二次覆工コンクリート13を支えている型枠装置20の下方を、縮径させた他の型枠装置20を通過させて前方に送ることができる。これにより、二次覆工コンクリート13が所定の強度を発現するまでの養生期間を十分に確保して、覆工体15の品質を確保しつつ、施工の迅速化を図ることが可能となる。
As described above, the fixing member 41 of the fixture 40 is fixed to the natural ground G, and is supported by the mold apparatus 20 by the locking member 42 provided at the front end portion 41 s of the fixing member 41. 20 is supported by natural ground G.
Thereby, the formwork apparatus 20 can support the load and pressure of the secondary lining concrete 13 without requiring support by a gantry or the like. Therefore, the lower part of the formwork apparatus 20 supporting the secondary lining concrete 13 can be passed forward through the other formwork apparatus 20 having a reduced diameter. As a result, it is possible to ensure a sufficient curing period until the secondary lining concrete 13 exhibits a predetermined strength, and to speed up the construction while ensuring the quality of the lining body 15.

また、定着部材41の先端部41sに設けられた雄ネジ部材43に、係止部材42のナット45を螺合させることによって、係止部材42を、定着部材41に対して容易に着脱することができる。これによって、型枠装置20の設置作業、および型枠装置20の取り外し作業を効率よく行うことが可能となる。
また、取り外した係止部材42を構成するベース部材44およびナット45は、繰り返し使用することができるので、コスト低減を図ることができる。
Further, the locking member 42 can be easily attached to and detached from the fixing member 41 by screwing the nut 45 of the locking member 42 into the male screw member 43 provided at the front end portion 41 s of the fixing member 41. Can do. Thereby, the installation work of the mold apparatus 20 and the removal work of the mold apparatus 20 can be performed efficiently.
Moreover, since the base member 44 and the nut 45 which comprise the removed locking member 42 can be used repeatedly, cost reduction can be aimed at.

また、雄ネジ部材43の挿入穴43hに定着部材41の先端部41sを挿入した状態で、イモネジ43cにより定着部材41の先端部41sを固定することによって、雄ネジ部材43を定着部材41の先端部41sに装着することができるようになっている。
また、イモネジ43cによる定着部材41の先端部41sの固定を解除すれば、定着部材41の先端部41sを雄ネジ部材43の挿入穴43hから抜くことができる。これによって、定着部材41から雄ネジ部材43を容易に取り外すことができる。したがって、雄ネジ部材43についても、繰り返し使用することができ、これによってもコスト低減を図ることができる。
Further, with the distal end portion 41 s of the fixing member 41 being inserted into the insertion hole 43 h of the male screw member 43, the distal end portion 41 s of the fixing member 41 is fixed by the set screw 43 c, whereby the male screw member 43 is attached to the distal end of the fixing member 41. It can be attached to the portion 41s.
Further, if the fixing of the tip 41s of the fixing member 41 by the female screw 43c is released, the tip 41s of the fixing member 41 can be removed from the insertion hole 43h of the male screw member 43. Thereby, the male screw member 43 can be easily removed from the fixing member 41. Therefore, the male screw member 43 can also be used repeatedly, which can also reduce the cost.

また、係止部材42は、定着部材41の外周部で型枠装置20に突き当たるとともに、定着部材41の先端部41sが貫通するベース部材44と、ベース部材44を貫通した定着部材41の先端部41sの雄ネジ部材43に螺合するナット45と、を備える。
このような構成によれば、ベース部材44は、定着部材41の外周側で型枠装置20に突き当たる。したがって、定着部材41および係止部材42から作用する応力が、ベース部材44によって分散して型枠装置20に作用する。したがって、固定具40で型枠装置20を支持することによる、型枠装置20における応力集中を避けることができる。
Further, the locking member 42 abuts against the mold apparatus 20 at the outer peripheral portion of the fixing member 41, and the base member 44 through which the front end portion 41 s of the fixing member 41 passes, and the front end portion of the fixing member 41 through the base member 44. And a nut 45 screwed into the male screw member 43 of 41s.
According to such a configuration, the base member 44 abuts on the mold apparatus 20 on the outer peripheral side of the fixing member 41. Therefore, the stress acting from the fixing member 41 and the locking member 42 is dispersed by the base member 44 and acts on the mold apparatus 20. Therefore, stress concentration in the mold apparatus 20 caused by supporting the mold apparatus 20 with the fixture 40 can be avoided.

加えて、上記したような固定具40の定着部材41は、型枠装置20を撤去した後、トンネルTに設置する照明装置、換気設備等の機器類を支持する用途でも用いることができる。この場合、定着部材41の先端部41sに、雄ネジ部材43をそのまま装着しておき、この雄ネジ部材43によって機器類を支持するようにしてもよい。   In addition, the fixing member 41 of the fixture 40 as described above can also be used for applications such as lighting devices and ventilation equipment installed in the tunnel T after the formwork device 20 is removed. In this case, the male screw member 43 may be mounted as it is on the tip 41 s of the fixing member 41, and the equipment may be supported by the male screw member 43.

なお、本発明のトンネル覆工用型枠の支持方法、トンネル覆工用型枠の支持構造、トンネルの覆工方法は、図面を参照して説明した上述の実施形態に限定されるものではなく、その技術的範囲において様々な変形例が考えられる。   The tunnel lining form support method, tunnel lining form support structure, and tunnel covering method of the present invention are not limited to the above-described embodiment described with reference to the drawings. Various modifications can be considered in the technical scope.

例えば、固定具40において、定着部材41として、ロックボルトを用いたが、これに代えて、鋼棒や鋼製の棒ネジを用いてもよい。
さらに、図7に示すように、定着部材41に棒ネジを用いる場合、その先端部に筒状で内周面にネジ溝50nが形成されたスリーブ継手50の一端を接続し、スリーブ継手50の他端に、延長用棒ネジ51を接続してもよい。そして、延長用棒ネジ51の先端部に、ナット45をねじ込むことによって、定着部材41をスリーブ継手50および延長用棒ネジ51を介して固定することができる。このようにして、上記実施形態と同様、固定具40によって型枠装置20を支持することができる。
そして、このような構成によれば、型枠装置20を取り外すときには、ナット45、ベース部材44を取り外した後、さらに延長用棒ネジ51およびスリーブ継手50を取り外す。これにより、型枠装置20を撤去した後に、定着部材41が二次覆工コンクリート13の内周側に突出するのを、容易に抑えることができる。
For example, in the fixture 40, the lock bolt is used as the fixing member 41. However, instead of this, a steel bar or a steel bar screw may be used.
Furthermore, as shown in FIG. 7, when a bar screw is used for the fixing member 41, one end of a sleeve joint 50 having a cylindrical shape at its tip and a thread groove 50 n formed on the inner peripheral surface thereof is connected. An extension rod screw 51 may be connected to the other end. The fixing member 41 can be fixed via the sleeve joint 50 and the extension rod screw 51 by screwing the nut 45 into the tip of the extension rod screw 51. In this manner, the mold apparatus 20 can be supported by the fixture 40 as in the above embodiment.
And according to such a structure, when removing the formwork apparatus 20, after removing the nut 45 and the base member 44, the extension rod screw 51 and the sleeve joint 50 are further removed. Thereby, it can suppress easily that the fixing member 41 protrudes to the inner peripheral side of the secondary lining concrete 13 after removing the formwork apparatus 20. FIG.

また、図8に示すように、固定具40において、定着部材41の先端部41sを型枠装置20に係止させる係止部材42として、以下のような構成のものを用いることもできる。
すなわち、この係止部材42は、ベース部材60と、接続ロッド61と、ナット62と、を備えている。
Further, as shown in FIG. 8, in the fixture 40, as the locking member 42 for locking the tip end portion 41s of the fixing member 41 to the mold apparatus 20, a member having the following configuration can be used.
That is, the locking member 42 includes a base member 60, a connecting rod 61, and a nut 62.

ベース部材60は、プレート状の座金部63と、座金部63の外周部から型枠装置20の内周面20gに向けて延びる脚部65と、を一体に備えている。このベース部材60は、脚部65を型枠装置20の内周面20gに突き当てた状態でセットされる。   The base member 60 is integrally provided with a plate-shaped washer portion 63 and leg portions 65 extending from the outer peripheral portion of the washer portion 63 toward the inner peripheral surface 20 g of the mold apparatus 20. The base member 60 is set in a state where the legs 65 are abutted against the inner peripheral surface 20g of the mold apparatus 20.

接続ロッド61は、その先端部に、定着部材41の先端部41sが挿入されて契合される挿入穴61hを備えている。定着部材41の先端部41sの外周面にネジ溝が形成されている場合には、挿入穴61の内周面にネジ溝を形成し、これらを互いに螺合させる。また、定着部材41がワイヤーケーブルや鋼棒である場合等には、挿入穴61に定着部材41の先端部41sを圧入することで、これらを互いに係合させてもよい。   The connecting rod 61 is provided with an insertion hole 61h at the distal end thereof, into which the distal end 41s of the fixing member 41 is inserted and engaged. When screw grooves are formed on the outer peripheral surface of the tip portion 41s of the fixing member 41, screw grooves are formed on the inner peripheral surface of the insertion hole 61, and these are screwed together. In addition, when the fixing member 41 is a wire cable or a steel rod, the distal end portion 41s of the fixing member 41 may be press-fitted into the insertion hole 61 so that they are engaged with each other.

接続ロッド61の基端部には、その外周面にネジ溝61nが形成されている。接続ロッド61の基端部は、ベース部材60の座金部63に形成された貫通孔63hを貫通し、座金部63から突出するよう設けられている。
また、接続ロッド61の基端部には、角柱状の工具係合部61tが形成されている。この工具係合部61tに、断面視矩形の孔を有した工具を係合させることで、この工具によって接続ロッド61をその中心軸回りに回転させることができるようになっている。
A thread groove 61 n is formed on the outer peripheral surface of the base end portion of the connecting rod 61. The base end portion of the connecting rod 61 is provided so as to penetrate the through hole 63 h formed in the washer portion 63 of the base member 60 and protrude from the washer portion 63.
Further, a prismatic tool engaging portion 61t is formed at the proximal end portion of the connecting rod 61. By engaging a tool having a rectangular hole in cross section with the tool engaging portion 61t, the connecting rod 61 can be rotated around its central axis by this tool.

ナット62は、座金部63から突出した接続ロッド61の基端部のネジ溝61nにねじ込まれている。このナット62により、接続ロッド61が座金部63に固定されている。ここで、ナット62のねじ込み量を調整すると、接続ロッド61が座金部63に直交する方向に変位する。   The nut 62 is screwed into the screw groove 61 n at the base end portion of the connecting rod 61 protruding from the washer portion 63. The connecting rod 61 is fixed to the washer portion 63 by the nut 62. Here, when the screwing amount of the nut 62 is adjusted, the connecting rod 61 is displaced in a direction orthogonal to the washer portion 63.

このような構成によっても、上記実施形態と同様に、固定具40の定着部材41が地山Gに定着され、定着部材41の先端部41sに設けられた係止部材42により型枠装置20が支持されているので、型枠装置20は、地山Gに強固に支持される。   Even with such a configuration, the fixing member 41 of the fixing tool 40 is fixed to the ground G, and the formwork device 20 is fixed by the locking member 42 provided at the tip 41s of the fixing member 41, as in the above embodiment. Since it is supported, the formwork apparatus 20 is firmly supported by the natural ground G.

また、上記したような接続ロッド61は、Cボルト、Cタイプアンカー等と称される市販の汎用品を用いることができる。これにより、低コストで固定具40を構成することが可能となる。   For the connecting rod 61 as described above, a commercially available general-purpose product called C bolt, C type anchor or the like can be used. As a result, the fixture 40 can be configured at low cost.

なお、上記接続ロッド61は、図8に示したものよりも長尺化し、その先端部を、一次覆工コンクリート11の近傍、あるいは一次覆工コンクリート11を貫通して地山G中に配置し、定着部材41の先端部41sに連結するようにしてもよい。   The connecting rod 61 is longer than that shown in FIG. 8, and the tip of the connecting rod 61 is arranged in the natural ground G near the primary lining concrete 11 or through the primary lining concrete 11. Alternatively, the fixing member 41 may be connected to the tip portion 41s.

また、固定具40を設ける数や位置は特に限定されない。打設するコンクリートの特性、地山Gの状態、採用する型枠装置20の形状などによって、固定具40の設置数、あるいは設置位置を変更することができる。   Further, the number and position of the fixtures 40 are not particularly limited. Depending on the properties of the concrete to be placed, the state of the natural ground G, the shape of the formwork device 20 to be adopted, the number of installations or the installation positions of the fixtures 40 can be changed.

また、上記実施形態では、定着部材41を地山G内に定着させる構成を示したが、十分な支持強度が得られるのであれば、定着部材41は、地山G内に定着させず、アンカー部材を介して一次覆工コンクリート11に定着させてもよい。また、一次覆工時に、掘削孔Hの内周面に沿って設ける鋼製支保工に定着部材41の一端を固定してもよい。   In the above-described embodiment, the fixing member 41 is fixed in the natural ground G. However, if sufficient support strength is obtained, the fixing member 41 is not fixed in the natural ground G and is anchored. You may fix to the primary lining concrete 11 through a member. Moreover, you may fix the end of the fixing member 41 to the steel support provided along the inner peripheral surface of the excavation hole H at the time of a primary lining.

さらに、定着部材41は、一次覆工コンクリート11の表面に突出したロックボルト12の先端部に接続される構成としてもよい。すなわち、地山Gに打ち込んだロックボルト12の先端部に、定着部材41の先端部41sとは異なる端部を接続させることによって、型枠装置20を支持してもよい。この場合、定着部材41を、ワイヤーケーブル、鋼棒、鋼製の棒ねじとしてもよい。   Further, the fixing member 41 may be configured to be connected to the tip end portion of the lock bolt 12 protruding from the surface of the primary lining concrete 11. That is, the formwork device 20 may be supported by connecting an end portion different from the tip end portion 41 s of the fixing member 41 to the tip end portion of the lock bolt 12 driven into the natural ground G. In this case, the fixing member 41 may be a wire cable, a steel bar, or a steel bar screw.

また、上記実施形態では、ガントリーを用いず、固定具40によって型枠装置20を支持する構成を示したが、固定具40とガントリーとの併用により型枠装置20を支持してもよい。このような構成では、二次覆工コンクリートの打設時には、これら双方の構成により、より確実に型枠装置20を支持することができる。また、ガントリーは作業足場としても利用することができる。このような構成によれば、型枠装置20は固定具40によって支持されているため、二次覆工コンクリート13の所定の強度が発現する前、すなわち二次覆工コンクリート13が若材齢であっても、ガントリーによる型枠装置20の支持を解除してガントリーを移動させることができる。その結果、施工の迅速化を図ることが可能となる。   Moreover, in the said embodiment, although the gantry was not used and the structure which supports the formwork apparatus 20 with the fixing tool 40 was shown, you may support the formwork apparatus 20 by the combined use of the fixing tool 40 and the gantry. With such a configuration, when placing the secondary lining concrete, the formwork device 20 can be more reliably supported by both of these configurations. The gantry can also be used as a working scaffold. According to such a structure, since the formwork apparatus 20 is supported by the fixture 40, before the predetermined strength of the secondary lining concrete 13 is expressed, that is, the secondary lining concrete 13 is young. Even if it exists, support of the formwork apparatus 20 by a gantry can be cancelled | released, and a gantry can be moved. As a result, it is possible to speed up the construction.

また、固定具40は、上記実施形態で示したような構成の型枠装置20に限らず、他の様々な構成の型枠装置の支持固定にも有効に用いることができる。   Further, the fixture 40 is not limited to the formwork device 20 having the configuration as shown in the above embodiment, but can be effectively used for supporting and fixing the formwork device having various other configurations.

これ以外にも、本発明の主旨を逸脱しない限り、上記実施の形態で挙げた構成を取捨選択したり、他の構成に適宜変更したりすることが可能である。   In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

11 一次覆工コンクリート
13 二次覆工コンクリート
20 型枠装置
20f 型枠面
40 固定具
41 定着部材
41s 先端部
42 係止部材
43 雄ネジ部材
43c イモネジ(固定部材)
43h 挿入穴
43n ネジ溝(雄ネジ部)
44 ベース部材
45 ナット
45n 雌ネジ部
50 スリーブ継手
51 延長用棒ネジ
60 ベース部材
61 接続ロッド
62 ナット
G 地山
H 掘削孔
T トンネル
DESCRIPTION OF SYMBOLS 11 Primary lining concrete 13 Secondary lining concrete 20 Formwork apparatus 20f Formwork surface 40 Fixing tool 41 Fixing member 41s Tip part 42 Locking member 43 Male screw member 43c Female screw (fixing member)
43h Insertion hole 43n Thread groove (Male thread)
44 Base member 45 Nut 45n Female thread 50 Sleeve joint 51 Extension rod screw 60 Base member 61 Connecting rod 62 Nut G Ground H Drilling hole T Tunnel

Claims (6)

地山に形成された掘削孔の内方に着脱可能な型枠装置を支持固定する固定具であって、
一端側が、前記地山側に固定され、他端側が前記掘削孔の内方に突出するとともに、前記型枠装置を貫通して設けられる定着部材と、
前記型枠装置を貫通した前記定着部材の他端側に着脱可能に設けられ、前記型枠装置を前記掘削孔の内方から係止する係止部材と、
を備え
前記係止部材の着脱により、前記型枠装置を着脱可能であることを特徴とする固定具。
A fixing tool for supporting and fixing a detachable formwork device inside an excavation hole formed in a natural ground,
One end side is fixed to the natural ground side, the other end side protrudes inward of the excavation hole, and a fixing member provided through the formwork device,
A locking member that is detachably provided on the other end side of the fixing member penetrating the mold device, and locks the mold device from the inside of the excavation hole ;
Equipped with a,
The engagement by removable of the stopper member, fastener, wherein a detachable der Rukoto the formwork device.
前記定着部材の先端部に、雄ネジ部が設けられ、
前記係止部材は、前記雄ネジ部に螺合する雌ネジ部を有することを特徴とする請求項1に記載の固定具。
A male screw portion is provided at the tip of the fixing member,
The fixing device according to claim 1, wherein the locking member has a female screw portion that is screwed into the male screw portion.
前記定着部材の先端部が挿入される挿入穴と、前記挿入穴に挿入された前記定着部材の先端部を固定する固定部材と、前記雄ネジ部と、を備えた雄ネジ部材が前記定着部材の先端部に着脱可能に設けられていることを特徴とする請求項2に記載の固定具。   A male screw member comprising: an insertion hole into which the distal end portion of the fixing member is inserted; a fixing member that fixes the distal end portion of the fixing member inserted into the insertion hole; and the male screw portion. The fixing tool according to claim 2, wherein the fixing tool is detachably provided at a distal end portion. 前記係止部材は、前記定着部材の外周部で前記型枠装置に突き当たるとともに、前記定着部材の先端部が貫通するベース部材と、
前記ベース部材を貫通した前記定着部材の先端部の前記雄ネジ部に螺合する前記雌ネジ部を有したナットと、を備え
前記ベース部材は、前記定着部材が貫通する部分に、前記型枠装置を貫通して前記地山側へ突出し、その外径が該突出方向に向かって縮小する円錐台形状の突部を備えることを特徴とする請求項2または3に記載の固定具。
The locking member abuts against the mold apparatus at an outer peripheral portion of the fixing member, and a base member through which a front end portion of the fixing member passes,
A nut having the female screw portion threadedly engaged with the male screw portion of the distal end portion of the fixing member penetrating the base member ,
The base member, the portion where the fixing member is penetrated, Rukoto provided with the formwork device projects a to penetrate the ground mountain side, projections frustoconical reduced toward exits the outer diameter of the projecting The fixture according to claim 2 or 3, wherein
前記定着部材の先端部が、照明装置又は換気設備を吊り下げる引き止め部を構成する請求項1から4のいずれか一項に記載の固定具。   The fixture according to any one of claims 1 to 4, wherein a tip portion of the fixing member constitutes a retaining portion that suspends the lighting device or the ventilation facility. トンネル覆工用型枠の支持構造であって、
地山に掘削された掘削孔の内部に配置され、前記掘削孔の内周面に対向した型枠面を有する型枠装置と、
前記型枠装置を固定するために、その一端側が前記地山側に固定され、他端側が前記型枠装置に係止された請求項1から5のいずれか一項に記載の固定具と、
を備えていることを特徴とするトンネル覆工用型枠の支持構造。
A tunnel lining formwork support structure,
A mold apparatus that is disposed inside a drill hole drilled in a natural ground and has a mold surface facing the inner peripheral surface of the drill hole;
In order to fix the formwork device, one end side thereof is fixed to the natural ground side, and the other end side is locked to the formwork device, and the fixture according to any one of claims 1 to 5,
A structure for supporting a tunnel lining formwork.
JP2014162168A 2014-08-08 2014-08-08 Support structure for fixture and tunnel lining formwork Active JP6355475B2 (en)

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Publication number Priority date Publication date Assignee Title
US4129991A (en) * 1977-10-28 1978-12-19 Karl Schaden Method of producing a concrete lined tunnel or other underground excavation
JP2503349B2 (en) * 1992-09-21 1996-06-05 株式会社大林組 Formwork device for secondary lining in tunnel
JPH0996194A (en) * 1995-09-29 1997-04-08 Shimizu Corp Structure of support wall and construction method therefor
JPH09209696A (en) * 1996-02-02 1997-08-12 Shimizu Corp Tunnel lining movable form device
SE525140C2 (en) * 2003-05-12 2004-12-07 Atlas Copco Rock Drills Ab Expandable rock bolt and rock bolt system
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