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JP4823042B2 - Branch tunnel construction segment - Google Patents

Branch tunnel construction segment Download PDF

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Publication number
JP4823042B2
JP4823042B2 JP2006333345A JP2006333345A JP4823042B2 JP 4823042 B2 JP4823042 B2 JP 4823042B2 JP 2006333345 A JP2006333345 A JP 2006333345A JP 2006333345 A JP2006333345 A JP 2006333345A JP 4823042 B2 JP4823042 B2 JP 4823042B2
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peripheral surface
segment
hole
tunnel
cap
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JP2008144478A (en
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開次郎 伊澤
直昭 藤本
廉樹 浅沼
圭造 北山
幸蔵 元樋
輝幸 和気
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Fujita Corp
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Fujita Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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  • Excavating Of Shafts Or Tunnels (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Description

本発明は、親トンネルから分岐させる形で新たなトンネルを構築する場合に、効率的な
施工を行なう上で有利な分岐トンネル施工用セグメントに関する。
The present invention relates to a branch tunnel construction segment that is advantageous for efficient construction when a new tunnel is constructed by branching from a parent tunnel.

例えば、既に構築された親トンネル内で、新たなトンネルを分岐施工するための掘削機械を組み立てて地山中に押し出し、新たなトンネルを分岐施工することが近年行なわれている。
この方法では、既に設置されたトンネルの覆工のうち、新たなトンネルを発進させる部分の覆工を切削可能な材料としておくことで施工の効率化をはかることが多い(特許文献1)。
特開2003−253992
For example, in recent years, an excavating machine for branching a new tunnel is assembled in a parent tunnel that has already been constructed and pushed into a natural ground to branch a new tunnel.
In this method, the efficiency of the construction is often improved by setting the lining of the portion where the new tunnel is started out of the lining of the already installed tunnel as a material that can be cut (Patent Document 1).
JP2003-253992A

一方、親トンネルから新たなトンネルを分岐施工する場合、地下水のトンネル内への流入を阻止する観点や地山の崩壊防止の観点などから、図1に示すように、新たなトンネルT1が施工される周囲の地盤Gに薬液を注入し、斜線で示すように地盤改良を施す必要がある。
この場合、分岐施工する箇所に位置するセグメントSの複数箇所に、削孔兼薬液注入用ロッド52をトンネル54外に突出させるためのロッド挿通用孔56を貫通形成しなければならない。
しかしながら、分岐施工する箇所に位置するセグメントSが、シールド機により切削可能な材料で形成されているものの、セグメントSは硬いため、ロッド挿通用孔56の孔あけ作業に時間がかかり、また、クラックが生じないように慎重に行う必要があり、さらに狭い場所での作業となることから、セグメントSに対しての孔あけ作業は困難な作業となっている。
実際には、地盤改良を所定の範囲にわたって行なうにはこの困難なロッド挿通用孔56を、複数のセグメントSに対して合計で30〜40程度設ける必要がある。
そして、一つの孔あけに1時間程度かかることから、地盤改良のためのセグメントSの孔あけのみに30〜40時間を費やしているのが現状であり、分岐トンネルの施工効率を高め、コストダウンを図る上で何らかの改善が望まれていた。
On the other hand, when a new tunnel is branched from the parent tunnel, a new tunnel T1 is constructed as shown in FIG. 1 from the viewpoint of preventing the inflow of groundwater into the tunnel and from the viewpoint of preventing the collapse of natural ground. It is necessary to inject the chemical into the surrounding ground G and improve the ground as shown by the oblique lines.
In this case, rod insertion holes 56 for projecting the drilling / chemical solution injection rod 52 out of the tunnel 54 must be formed through a plurality of locations of the segment S located at the branch construction location.
However, although the segment S located at the location to be branched is formed of a material that can be cut by a shield machine, since the segment S is hard, the drilling operation of the rod insertion hole 56 takes time and cracks are generated. Therefore, it is necessary to perform carefully so as not to occur, and since the operation is performed in a narrower place, the drilling operation for the segment S is a difficult operation.
Actually, in order to improve the ground over a predetermined range, this difficult rod insertion hole 56 needs to be provided in a total of about 30 to 40 for a plurality of segments S.
And since it takes about one hour to drill a single hole, it is 30-40 hours only to drill the segment S for ground improvement, increasing the construction efficiency of the branch tunnel and reducing the cost. Some improvement was desired in order to achieve this.

本発明は前記事情に鑑み案出されたものであって、本発明の目的は、親トンネルから分岐トンネルを施工する際に、分岐トンネルの施工効率を高める上で有利な分岐トンネル施工用セグメントを提供することにある。   The present invention has been devised in view of the above circumstances, and the object of the present invention is to provide a branch tunnel construction segment that is advantageous in improving the construction efficiency of the branch tunnel when constructing the branch tunnel from the parent tunnel. It is to provide.

前記目的を達成するため本発明は、トンネル内で新たなトンネルを分岐施工する箇所に設置される分岐トンネル施工用セグメントであって、厚さ方向の一方の面がトンネルに臨む内周面とされ、厚さ方向の他方の面が地山に臨む外周面とされるセグメント本体と、前記セグメント本体の互いに離れた箇所で厚さ方向に貫通形成され削孔兼薬液注入用ロッドの挿通を可能とした複数の貫通孔と、前記セグメント本体の外周面において前記各貫通孔を閉塞する第1のキャップとを備え、前記セグメント本体の厚さ方向に貫通させて複数のパイプが埋め込まれ、前記貫通孔は前記パイプの内周面で形成され、前記パイプの長手方向の中間部で前記パイプの長手方向に間隔をおいた前記パイプの内周面の複数箇所に、前記削孔兼薬液注入用ロッドの挿通を可能とし、かつ、挿通される削孔兼薬液注入用ロッドの外周面に接触して前記パイプの内周面と前記削孔兼薬液注入用ロッドの外周面との間の環状の隙間を通り前記セグメント本体の外周面から内周面に向かう水の流れを止める弁が設けられ、前記弁は、前記パイプに取着された弾性変形可能な材料からなり前記削孔兼薬液注入用ロッドの挿通を可能とした中央孔を有する環板状のパッキンにより構成され、前記第1のキャップは、破砕し易い材料で形成され、あるいは、前記貫通孔から地山側に向けて取り外し可能に設けられていることを特徴とする。
In order to achieve the above object, the present invention is a branch tunnel construction segment installed at a location where a new tunnel is branched in the tunnel, and one surface in the thickness direction is an inner peripheral surface facing the tunnel. The segment body whose other surface in the thickness direction is the outer peripheral surface facing the natural ground, and the segment body penetrating in the thickness direction at locations away from each other, enabling the insertion of a drilling and chemical injection rod and a plurality of through-holes, and a first cap you close the respective through holes in the outer peripheral surface of the segment body, said segment by penetrating in the thickness direction of the main body a plurality of pipes buried, said through A hole is formed in the inner peripheral surface of the pipe, and the drilling / chemical solution injection rod is formed at a plurality of locations on the inner peripheral surface of the pipe at intervals in the longitudinal direction of the pipe at an intermediate portion in the longitudinal direction of the pipe. Insertion And an annular gap between the inner peripheral surface of the pipe and the outer peripheral surface of the drilling / chemical solution injection rod in contact with the outer peripheral surface of the inserted hole / chemical solution injection rod. A valve for stopping the flow of water from the outer peripheral surface to the inner peripheral surface of the segment main body is provided, and the valve is made of an elastically deformable material attached to the pipe and is inserted through the drilling and chemical injection rod. is constituted by the ring-shaped packing having a possible and the center hole, said first cap is formed of crushed-prone materials, or provided detachably toward from the through hole in the land mountainside It is characterized by that.

本発明では、地盤改良を施す際の、セグメント本体の厚さ方向に貫通する複数の貫通孔を瞬時に得ることができ、セグメントに対しての困難な削孔兼薬液注入ロッドによる孔あけ作業を省ける。したがって、新たなトンネルを分岐施工する際の薬液による地盤改良作業を効率よく行なえる。   In the present invention, when the ground is improved, a plurality of through holes penetrating in the thickness direction of the segment main body can be obtained instantaneously, and a hole drilling operation with a hole drilling / chemical solution injection rod for the segment is difficult. Save. Therefore, it is possible to efficiently perform ground improvement work using chemicals when branching a new tunnel.

以下、本発明の実施の形態を図面にしたがって説明する。
図2はキャップを取り外した状態のセグメントの斜視図、図3は貫通孔部分のセグメントの断面図、図4はパイプと第1、第2のキャップと弁との関係図、図5は削孔兼薬液注入ロッドの地山への進出時の説明図、図6は削孔兼薬液注入ロッドを貫通孔から抜き出した状態の説明図を示す。
本実施の形態に係るセグメントSは、親トンネルから新たなトンネルを分岐施工する際に、分岐施工する箇所に複数設置されるものであり、本実施の形態では、トンネルは下水道用のものである。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
2 is a perspective view of the segment with the cap removed, FIG. 3 is a sectional view of the segment of the through-hole portion, FIG. 4 is a diagram showing the relationship between the pipe, the first cap, the second cap, and the valve, and FIG. FIG. 6 is an explanatory diagram when the cum-chemical injection rod is advanced to the natural ground, and FIG. 6 is an explanatory diagram showing a state where the drilling / chemical injection rod is extracted from the through hole.
The segment S according to the present embodiment is installed in a plurality of locations where the new tunnel is branched from the parent tunnel, and in this embodiment, the tunnel is for sewerage. .

図2乃至図3に示すように、セグメントSは、セグメント本体12と、複数の貫通孔14と、第1のキャップ16と、第2のキャップ18と、弁20とを含んで構成されている。
セグメント本体12は、板状で円弧状に延在し、新たなトンネルを分岐施工する際にシールド機により切削可能な素材で形成されている。なお、トンネル断面が矩形の場合には、セグメント本体は、平坦な板状やL字状を呈することになる。
セグメント本体12は、その厚さ方向の一方の面がトンネル坑内に臨む内周面22とされ、厚さ方向の他方の面が地山Gに臨む外周面24とされ、それら内周面22と外周面24はそれぞれ円筒面で形成されている。
なお、図面では省略されているが、セグメント本体12の周方向の端面や、幅方向の端面には、隣に設置されるセグメント本体12に連結するための従来公知の継ぎ手が設けられている。
As shown in FIGS. 2 to 3, the segment S includes a segment body 12, a plurality of through holes 14, a first cap 16, a second cap 18, and a valve 20. .
The segment body 12 has a plate shape and extends in an arc shape, and is formed of a material that can be cut by a shield machine when branching a new tunnel. When the tunnel cross section is rectangular, the segment body has a flat plate shape or an L shape.
The segment body 12 has an inner peripheral surface 22 facing one surface in the thickness direction facing the tunnel pit, and an outer peripheral surface 24 facing the natural ground G, the other surface in the thickness direction. Each outer peripheral surface 24 is formed of a cylindrical surface.
Although not shown in the drawings, conventionally known joints for connecting to the segment body 12 installed next to each other are provided on the end surface in the circumferential direction and the end surface in the width direction of the segment body 12.

貫通孔14は、セグメント本体12の互いに離れた箇所に厚さ方向に貫通して複数設けられている。
貫通孔14は、削孔兼薬液注入用ロッド52が挿通される内径で形成されている。
本実施の形態では、セグメント本体12の製造時に、型内に複数のパイプ26が設置されたのち、型内にコンクリートが打ち込まれてセグメント本体12が製造されており、セグメント本体12には予め複数のパイプ26が埋め込まれている。
そして、貫通孔14は、それらパイプ26の内周面で形成されている。
パイプ26は、新たなトンネルを分岐施工する際にシールド機により切削可能な素材で形成され、このような材料として、例えば、塩化ビニルなどの合成樹脂が採用できる。
A plurality of through-holes 14 are provided penetrating in the thickness direction at locations separated from each other of the segment body 12.
The through hole 14 is formed with an inner diameter through which the drilling and chemical injection rod 52 is inserted.
In the present embodiment, when the segment body 12 is manufactured, a plurality of pipes 26 are installed in the mold, and then the concrete is driven into the mold to manufacture the segment body 12. The pipe 26 is embedded.
The through holes 14 are formed on the inner peripheral surfaces of the pipes 26.
The pipe 26 is formed of a material that can be cut by a shield machine when branching a new tunnel. For example, a synthetic resin such as vinyl chloride can be used as such a material.

第1のキャップ16はセグメント本体12の外周面24で貫通孔14を閉塞している。
第1のキャップ16は、セグメントSの組み立て時に、湧き水などが貫通孔14を通ってトンネル坑内に侵入することを阻止するものである。
第1のキャップ16は、例えば、パイプ26の端部の外周面に嵌合される筒部1602と、筒部の端部1602において筒部1602の内側を閉塞する端面部1604とで構成されている。
本実施の形態では、セグメント本体12の製造時に、型内に、パイプ26の端部に嵌合されて設置されたのち、型内にコンクリートが打ち込まれてセグメント本体12が製造されており、セグメント本体12には予め複数のパイプ26と共に第1のキャップ16が埋め込まれている。
第1のキャップ16は、削孔兼薬液注入用ロッド52により破砕し易い材料で形成されている。このような材料として、例えば、塩化ビニルなどの合成樹脂が採用できる。
あるいは、第1のキャップ16は、貫通孔14から地山Gに削孔兼薬液注入用ロッド52を押し込む際に地山側に外れるように、セグメント本体12の半径方向外方に取り外し可能に設けられている。このような第1のキャップ16は、例えば、貫通孔14の内部に嵌合される円柱部と、この円柱部の端部に設けられセグメント本体12の外周面に臨む前記円柱部よりも大きな径のつば部などで構成することができる。
The first cap 16 closes the through hole 14 at the outer peripheral surface 24 of the segment body 12.
The first cap 16 prevents spring water or the like from entering the tunnel mine through the through hole 14 when the segment S is assembled.
The first cap 16 includes, for example, a cylindrical portion 1602 fitted to the outer peripheral surface of the end portion of the pipe 26 and an end surface portion 1604 that closes the inside of the cylindrical portion 1602 at the end portion 1602 of the cylindrical portion. Yes.
In the present embodiment, when the segment main body 12 is manufactured, the segment main body 12 is manufactured by fitting into the end of the pipe 26 in the mold and then driving concrete into the mold. A first cap 16 is embedded in the main body 12 together with a plurality of pipes 26 in advance.
The first cap 16 is formed of a material that is easily crushed by the drilling and chemical solution injection rod 52. As such a material, for example, a synthetic resin such as vinyl chloride can be employed.
Alternatively, the first cap 16 is provided so as to be detachable radially outward of the segment body 12 so that the first cap 16 can be removed from the through hole 14 into the natural ground G when it is pushed into the natural ground G. ing. Such a first cap 16 has a larger diameter than, for example, a columnar part fitted inside the through hole 14 and the columnar part provided at the end of the columnar part and facing the outer peripheral surface of the segment body 12. It can be composed of a brim of the collar.

第2のキャップ18はセグメント本体12の内周面22で貫通孔14を閉塞している。
第2のキャップ18は、例えば、パイプ26の端部の内周面に嵌合される円柱部1802と、この円柱部1802の端部に設けられセグメント本体12の内周面22に臨む前記円柱部1802よりも大きな径のつば部1804などで構成することができる。
第2のキャップ18は、セグメント本体12の製造時に、型内に、パイプ26、第1のキャップ16と共に設置し、型内にコンクリートを打ち込んでセグメント本体12を製造してもよく、あるいは、セグメント本体12の製造後に、パイプ26に嵌合させてもよい。
第2のキャップ18は、パイプ26、第1のキャップ16と同様に、例えば、塩化ビニルなどの合成樹脂で形成されている。
The second cap 18 closes the through hole 14 with the inner peripheral surface 22 of the segment body 12.
The second cap 18 is, for example, a cylindrical portion 1802 fitted to the inner peripheral surface of the end portion of the pipe 26, and the cylindrical member provided at the end portion of the cylindrical portion 1802 and facing the inner peripheral surface 22 of the segment body 12. The flange portion 1804 having a larger diameter than the portion 1802 can be used.
The second cap 18 may be installed together with the pipe 26 and the first cap 16 in the mold when the segment body 12 is manufactured, and the segment body 12 may be manufactured by driving concrete into the mold. You may make it fit in the pipe 26 after manufacture of the main body 12. FIG.
Similar to the pipe 26 and the first cap 16, the second cap 18 is formed of a synthetic resin such as vinyl chloride, for example.

弁20は、貫通孔14の内周面に設けられている。
弁20は、貫通孔14に挿通される削孔兼薬液注入用ロッド52の外周面に接触して貫通孔14の内周面と削孔兼薬液注入用ロッド52の外周面との間の環状の隙間を通りセグメント本体12の外周面2から内周面22に向かう湧き水などの流れを止めるものである。
本実施の形態では、弁20は、パイプ26の長手方向の中間部にパイプ26の長手方向に間隔をおいて複数設けられている。
本実施の形態では、弁20は、ゴムなどのような弾性変形可能な材料で形成された環板状のパッキン20Aで構成され、複数の環板状のパッキン20Aの外周部がパイプ26の内周面に取着されている。また、パッキン20Aの中央孔2002は、削孔兼薬液注入用ロッド52が挿通可能な内径で形成されている。
したがって、弁20は、セグメント本体12の製造時にパイプ26と共に型内に組み込まれ、セグメント本体12に予め組み込まれている。
The valve 20 is provided on the inner peripheral surface of the through hole 14.
The valve 20 is in contact with the outer peripheral surface of the drilling / chemical solution injection rod 52 inserted through the through hole 14 and is annular between the inner peripheral surface of the through hole 14 and the outer peripheral surface of the drilling / chemical solution injection rod 52. The flow of spring water or the like flowing from the outer peripheral surface 2 of the segment main body 12 toward the inner peripheral surface 22 through the gap is stopped.
In the present embodiment, a plurality of valves 20 are provided at intermediate portions in the longitudinal direction of the pipe 26 at intervals in the longitudinal direction of the pipe 26.
In the present embodiment, the valve 20 is constituted by an annular plate-like packing 20A formed of an elastically deformable material such as rubber, and the outer peripheral portion of the plural annular plate-like packings 20A is within the pipe 26. It is attached to the circumference. Further, the central hole 2002 of the packing 20A is formed with an inner diameter through which the drilling and chemical solution injection rod 52 can be inserted.
Therefore, the valve 20 is incorporated in the mold together with the pipe 26 when the segment body 12 is manufactured, and is incorporated in the segment body 12 in advance.

以上の構成からなるセグメントSは、親トンネルから新たなトンネルを分岐施工する際に、分岐施工する親トンネルの箇所に複数設置される。
そして、新たなトンネルを分岐施工する際に、地下水のトンネル内への流入を阻止する観点や地山の崩壊防止の観点などから、図1に示すように、それらセグメントSを介して新たなトンネルT1が施工される周囲の地盤Gに薬液を注入し、斜線で示すように地盤改良を施す。
すなわち、図5に示すように、第2のキャップ18を取り外し、パッキン20Aの中央孔2002を通して削孔兼薬液注入ロッド52を貫通孔14に挿入する。
削孔兼薬液注入ロッド52が貫通孔14の端部に位置したならば、削孔兼薬液注入ロッド52を回転駆動し、第1のキャップ16を破砕する。そして、削孔兼薬液注入ロッド52を推し進め、地盤に削孔兼薬液注入用ロッド52を進出させていき、薬液を注入する。
When the new tunnel is branched from the parent tunnel, a plurality of segments S configured as described above are installed at the location of the parent tunnel to be branched.
Then, when branching a new tunnel, from the viewpoint of preventing the inflow of groundwater into the tunnel and the viewpoint of preventing the collapse of the natural ground, as shown in FIG. The chemical solution is injected into the surrounding ground G where T1 is constructed, and the ground is improved as indicated by the oblique lines.
That is, as shown in FIG. 5, the second cap 18 is removed, and the drilling and chemical solution injection rod 52 is inserted into the through hole 14 through the central hole 2002 of the packing 20 </ b> A.
When the drilling / chemical solution injection rod 52 is positioned at the end of the through hole 14, the drilling / chemical solution injection rod 52 is driven to rotate, and the first cap 16 is crushed. Then, the drilling / chemical solution injection rod 52 is pushed forward, the drilling / chemical solution injection rod 52 is advanced to the ground, and the chemical solution is injected.

薬液の注入後、削孔兼薬液注入用ロッド52を貫通孔14から抜き出す。
削孔兼薬液注入用ロッド52を貫通孔14から抜き出した状態で、貫通孔14から湧き水などがトンネル内に流入してこない場合や、湧き水などが流入してもその量が少なくトンネル内の作業に支障を来たさない場合には、貫通孔14をそのままの状態に存置する。
また、湧き水などが流入してトンネル内の作業に支障を来たす場合には、図6に示すように貫通孔14にモルタルなどの間詰め材30を充填し、第2のキャップ18を取り付ける。
このような作業を、複数のセグメントSの各貫通孔14毎に行い、図1に斜線で示すように新たなトンネルT1が施工される周囲の地盤に地盤改良を施す。
そして、地盤改良後、新たなトンネルを分岐施工するための掘削機械によりそれら複数のセグメントSを削孔しつつ地山中に押し出し、新たなトンネルを分岐施工する。
After injection of the chemical solution, the drilling and chemical solution injection rod 52 is extracted from the through hole 14.
When the drilling / chemical solution injection rod 52 is pulled out from the through hole 14, spring water or the like does not flow into the tunnel from the through hole 14, or even if spring water or the like flows into the tunnel, the amount is small and the work in the tunnel If there is no hindrance, the through hole 14 is left as it is.
When spring water or the like flows into the tunnel and hinders the work in the tunnel, as shown in FIG. 6, the through hole 14 is filled with a filling material 30 such as mortar, and the second cap 18 is attached.
Such an operation is performed for each through-hole 14 of the plurality of segments S, and the ground is improved on the surrounding ground where a new tunnel T1 is to be constructed, as indicated by hatching in FIG.
Then, after the ground improvement, the excavating machine for branching a new tunnel pushes out the plurality of segments S into the ground while drilling, thereby branching a new tunnel.

したがって、本実施の形態のセグメントSを用いると、セグメント本体12の厚さ方向に貫通する複数の貫通孔14を瞬時に得ることができ、地盤改良を施す際の、セグメントSに対しての困難な削孔兼薬液注入ロッド52による孔あけ作業を省くことが可能となる。
したがって、削孔兼薬液注入用ロッド52を用いた地盤改良作業を効率よく行なえる。
また、本実施の形態では、弁20を設けたので、削孔兼薬液注入ロッド52による地盤の削孔時や薬液の地盤への浸透時に、湧き水などが貫通孔14を通ってトンネル坑内に流出することが阻止され、削孔兼薬液注入用ロッド52を用いた地盤改良作業を効率よく行なえる。
したがって、本実施の形態のセグメントSによれば、分岐トンネルの施工効率を高め、コストダウンを図る上で極めて有利となる。
Therefore, when the segment S of the present embodiment is used, a plurality of through holes 14 penetrating in the thickness direction of the segment main body 12 can be obtained instantaneously, and it is difficult for the segment S when performing ground improvement. Therefore, it is possible to omit the drilling work by the drilling and chemical solution injection rod 52.
Therefore, the ground improvement work using the drilling and chemical solution injection rod 52 can be performed efficiently.
In the present embodiment, since the valve 20 is provided, spring water flows out through the through hole 14 into the tunnel mine when the ground is drilled by the drilling and chemical injection rod 52 or when the chemical penetrates into the ground. Therefore, the ground improvement work using the drilling and chemical injection rod 52 can be performed efficiently.
Therefore, according to the segment S of this Embodiment, it becomes very advantageous when raising the construction efficiency of a branch tunnel and aiming at cost reduction.

なお、第1のキャップ16を設ける箇所は、セグメント本体12の外周面24に限らず任意であり、貫通孔14を閉塞し、削孔兼薬液注入用ロッド52の挿入の際に、破砕し易い材料で形成され、あるいは、貫通孔14から取り外し可能に設けられていればよいが、実施の形態のように、第1のキャップ16を、セグメント本体12の外周面24に設けると、貫通孔14内に弁20などを配置するスペースを確保でき有利となる。
また、弁20は省略可能であり、その場合には、削孔兼薬液注入ロッド52の外周面に、弁20と同様なパッキンなどを設ければよいが、実施の形態のように貫通孔14内に弁20を設けると、削孔兼薬液注入ロッド52の挿入を簡単に行え、削孔兼薬液注入用ロッド52を用いた地盤改良作業を効率よく行う上で有利となる。
また、第2のキャップ18は省略可能であるが、実施の形態のよう第2のキャップ18を設けると、貫通孔14が閉塞されセグメントSの取り扱いを簡単に行う上で有利となり、また、削孔兼薬液注入用ロッド52を貫通孔14から抜き出した際に貫通孔14を簡単に閉塞する上で有利となる。
The location where the first cap 16 is provided is not limited to the outer peripheral surface 24 of the segment main body 12, and is arbitrary, which closes the through hole 14 and is easily crushed when the drilling / chemical solution injection rod 52 is inserted. It is only necessary that the first cap 16 is formed on the outer peripheral surface 24 of the segment main body 12 as in the embodiment. A space for arranging the valve 20 and the like in the inside can be secured, which is advantageous.
Further, the valve 20 can be omitted, and in that case, it is only necessary to provide packing or the like similar to the valve 20 on the outer peripheral surface of the hole drilling / chemical solution injection rod 52, but the through hole 14 as in the embodiment. If the valve 20 is provided in the inside, it is possible to easily insert the hole-drilling / chemical solution injection rod 52, which is advantageous in efficiently performing the ground improvement work using the hole-drilling / chemical solution injection rod 52.
Further, the second cap 18 can be omitted. However, if the second cap 18 is provided as in the embodiment, the through hole 14 is closed, which is advantageous for easy handling of the segment S. This is advantageous for easily closing the through-hole 14 when the hole-cum-medical solution injection rod 52 is extracted from the through-hole 14.

地盤改良の説明図である。It is explanatory drawing of ground improvement. キャップを取り外した状態のセグメントの斜視図である。It is a perspective view of a segment in the state where a cap was removed. 貫通孔部分のセグメントの断面図である。It is sectional drawing of the segment of a through-hole part. パイプと第1、第2のキャップと弁との関係図である。It is a related figure of a pipe, the 1st and 2nd cap, and a valve. 削孔兼薬液注入ロッドの地山への進出時の説明図である。It is explanatory drawing at the time of advance of the drilling and chemical | medical solution injection rod to the natural ground. 削孔兼薬液注入ロッドを貫通孔から抜き出した状態の説明図である。It is explanatory drawing of the state which extracted the drilling and chemical | medical solution injection rod from the through-hole.

符号の説明Explanation of symbols

12……セグメント本体、14……貫通孔、16……第1のキャップ、18……第2のキャップ、20……弁、26……パイプ、S……セグメント。   12 …… Segment body, 14 …… Through hole, 16 …… First cap, 18 …… Second cap, 20 …… Valve, 26 …… Pipe, S …… Segment.

Claims (3)

トンネル内で新たなトンネルを分岐施工する箇所に設置される分岐トンネル施工用セグメントであって、
厚さ方向の一方の面がトンネルに臨む内周面とされ、厚さ方向の他方の面が地山に臨む外周面とされるセグメント本体と、
前記セグメント本体の互いに離れた箇所で厚さ方向に貫通形成され削孔兼薬液注入用ロッドの挿通を可能とした複数の貫通孔と、
前記セグメント本体の外周面において前記各貫通孔を閉塞する第1のキャップとを備え、
前記セグメント本体の厚さ方向に貫通させて複数のパイプが埋め込まれ、前記貫通孔は前記パイプの内周面で形成され、
前記パイプの長手方向の中間部で前記パイプの長手方向に間隔をおいた前記パイプの内周面の複数箇所に、前記削孔兼薬液注入用ロッドの挿通を可能とし、かつ、挿通される削孔兼薬液注入用ロッドの外周面に接触して前記パイプの内周面と前記削孔兼薬液注入用ロッドの外周面との間の環状の隙間を通り前記セグメント本体の外周面から内周面に向かう水の流れを止める弁が設けられ、
前記弁は、前記パイプに取着された弾性変形可能な材料からなり前記削孔兼薬液注入用ロッドの挿通を可能とした中央孔を有する環板状のパッキンにより構成され、
前記第1のキャップは、破砕し易い材料で形成され、あるいは、前記貫通孔から地山側に向けて取り外し可能に設けられている、
ことを特徴とする分岐トンネル施工用セグメント。
A branch tunnel construction segment installed at a location where a new tunnel is branched in the tunnel,
A segment body in which one surface in the thickness direction is an inner peripheral surface facing the tunnel, and the other surface in the thickness direction is an outer peripheral surface facing the natural ground,
A plurality of through-holes that are formed through in the thickness direction at locations separated from each other of the segment body, and that allow the insertion of a drilling and chemical solution injection rod;
And a first cap you close the respective through holes in the outer peripheral surface of the segment body,
A plurality of pipes are embedded through the segment body in the thickness direction, and the through holes are formed on the inner peripheral surface of the pipes,
The cutting hole / chemical solution injection rod can be inserted into a plurality of locations on the inner peripheral surface of the pipe at intervals in the longitudinal direction of the pipe at an intermediate portion in the longitudinal direction of the pipe, and An inner peripheral surface from the outer peripheral surface of the segment body through an annular gap between the inner peripheral surface of the pipe and the outer peripheral surface of the drilling / chemical solution injection rod in contact with the outer peripheral surface of the hole / chemical solution injection rod There is a valve to stop the flow of water towards
The valve is composed of an annular plate-like packing having a central hole made of an elastically deformable material attached to the pipe and allowing insertion of the drilling and chemical injection rod.
The first cap is formed of a material that is easily crushed, or is provided so as to be removable from the through hole toward the natural mountain side .
This is a segment for branch tunnel construction.
前記セグメント本体の内周面において前記各貫通孔を閉塞する第2のキャップをさらに備え、  A second cap for closing each through hole on the inner peripheral surface of the segment body;
前記第2のキャップは、破砕し易い材料で形成されあるいは前記貫通孔からトンネル内に向けて取り外し可能に設けられている、  The second cap is formed of a material that is easily crushed or is detachably provided from the through hole into the tunnel.
ことを特徴とする請求項1記載の分岐トンネル施工用セグメント。  The segment for branch tunnel construction according to claim 1 characterized by things.
前記パイプは合成樹脂製である、
ことを特徴とする請求項1または2記載の分岐トンネル施工用セグメント。
The pipe is made of synthetic resin,
The segment for branch tunnel construction according to claim 1 or 2 characterized by things.
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JPS62296006A (en) * 1986-06-13 1987-12-23 Hikari Sugimoto Method and apparatus for back-filling of tunnel and grouting of surrounding ground for improvement
JPH01146099A (en) * 1987-12-02 1989-06-08 Tokyo Chika Koji Kk Method of tunnel peripheral foundation improvement construction and device used for said method
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