JP6433861B2 - Injection pipe, segment, and grout material reinjection method for grout material injection - Google Patents
Injection pipe, segment, and grout material reinjection method for grout material injection Download PDFInfo
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- JP6433861B2 JP6433861B2 JP2015157251A JP2015157251A JP6433861B2 JP 6433861 B2 JP6433861 B2 JP 6433861B2 JP 2015157251 A JP2015157251 A JP 2015157251A JP 2015157251 A JP2015157251 A JP 2015157251A JP 6433861 B2 JP6433861 B2 JP 6433861B2
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Description
本発明は、シールドトンネルの覆工体などの地下構造物を構成するセグメントなどの構造部材に設けられるグラウト材注入用の注入管と、この注入管を備えるセグメントと、この注入管を用いるグラウト材の再注入方法とに関する。 The present invention relates to an injection pipe for injecting a grout material provided in a structural member such as a segment constituting an underground structure such as a shield tunnel covering, a segment including the injection pipe, and a grout material using the injection pipe And a reinjection method.
上下水道、共同溝、道路、鉄道等の管路として用いられるシールドトンネルは、シールド工法により形成される。
シールド工法では、例えば、地山に発進立坑と到達立坑とを構築し、発進立坑から到達立坑へ向けてシールド掘進機で地山を掘削しながら、シールド掘進機の後部で次々にセグメントをトンネル周方向に組み立ててセグメントリングを構築すると共に、隣接するセグメントリング同士をトンネル軸方向で連結することで円筒状の覆工体を構築する。この工法では、シールド掘進機は、その後方の既設セグメントリングを推進ジャッキで後方へ押圧し、その反力として発生する推力によって、地山を掘削しながら前進する。
Shield tunnels used as pipelines for water and sewage systems, common grooves, roads, railways, etc. are formed by a shield method.
In the shield method, for example, a start-up shaft and a reaching shaft are constructed in the ground, and the segments are tunneled around the tunnel one after another while excavating the ground with the shield machine from the start shaft to the arrival shaft. A segment ring is constructed by assembling in the direction, and a cylindrical lining body is constructed by connecting adjacent segment rings in the tunnel axis direction. In this construction method, the shield machine pushes the existing segment ring behind it with a propulsion jack and moves forward while excavating natural ground by the thrust generated as a reaction force.
また、シールドトンネル工事では、シールド掘進機による掘削地盤と既設セグメントリング（覆工体）との間の空隙にグラウト材（換言すれば裏込め材）を注入する。このグラウト材をシールドトンネル内から注入する場合には、例えば、セグメントの内面側から外面側（地山側）に貫通するようにセグメントに設けられたグラウト材注入用の注入管が用いられる。この注入管内には、前記空隙に注入したグラウト材などがシールドトンネル内に逆流しないように、逆止弁が１段設置されることが多い（特許文献１の図２参照）。 In shield tunnel construction, a grout material (in other words, a backfilling material) is injected into the gap between the excavation ground and the existing segment ring (lining body) by the shield machine. When injecting this grout material from within the shield tunnel, for example, an injection tube for injecting grout material provided in the segment so as to penetrate from the inner surface side of the segment to the outer surface side (ground mountain side) is used. In this injection pipe, a check valve is often installed in one stage so that the grout material injected into the gap does not flow back into the shield tunnel (see FIG. 2 of Patent Document 1).
しかしながら、シールドトンネルの深度が深くなると既設セグメントリング（覆工体）に作用する地下水圧が高くなるので、前記逆止弁に作用する水圧も高くなる。このため、前述のような１段の逆止弁では、地下水などのシールドトンネル内への流入を防ぐことが難しい場合があった。
本発明は、このような実状に鑑み、地下水などが前述の注入管を介して地下構造物（例えばシールドトンネルの覆工体）の内部に流入することを抑制することを目的とする。
However, as the depth of the shield tunnel increases, the groundwater pressure acting on the existing segment ring (lining body) increases, so the water pressure acting on the check valve also increases. For this reason, with the one-stage check valve as described above, it may be difficult to prevent inflow of groundwater or the like into the shield tunnel.
In view of such a situation, an object of the present invention is to suppress inflow of groundwater or the like into an underground structure (for example, a shield tunnel covering body) through the above-described injection pipe.
そのため本発明の第１態様及び第２態様では、グラウト材注入用の注入管は、地下構造物を構成する構造部材とその周辺の地山との間の空隙に、地下構造物内からグラウト材を注入するために、構造部材に設けられるものである。この注入管は、構造部材の地山側部分に位置して開口する一端部から地下構造物の内方に向かって延びる第１の管部と、第１の管部の他端部に連結される一端部から地下構造物の内方に向かって延びる第２の管部と、を備える。第１の管部内には、第１の管部の一端部側から他端部側への流体の流通を抑制する第１の逆止弁が設けられる。第２の管部内には、第２の管部の一端部側から他端部側への流体の流通を抑制する第２の逆止弁が設けられる。
前述の第１態様では、第２の管部は、その内径が、第１の逆止弁の外径よりも大きい。前述の第１態様では、第１の逆止弁は、第２の管部の他端部側の開口から第２の管部内に挿入されて第２の管部内を経て第１の管部内に設けられる。
前述の第２態様において、第１の管部の他端部側の内周面には、第１の逆止弁が螺合するための雌ねじ部が形成されている。前述の第２態様では、第１の逆止弁が第２の管部の他端部側の開口から第２の管部内に挿入されて第２の管部内を経て第１の管部内に設置可能なように、第２の管部の内径が第１の逆止弁の外径よりも大きい。
Therefore , in the first aspect and the second aspect of the present invention , the injection pipe for injecting the grout material is formed in the gap between the structural member constituting the underground structure and the surrounding natural ground from inside the underground structure. In order to inject the liquid, it is provided in the structural member. The injection pipe is connected to a first pipe portion that is located on a natural mountain side portion of the structural member and opens from one end portion that opens toward the inside of the underground structure, and the other end portion of the first pipe portion. A second pipe portion extending from one end portion toward the inside of the underground structure. In the 1st pipe part, the 1st non-return valve which suppresses the distribution | circulation of the fluid from the one end part side of the 1st pipe part to the other end part side is provided. In the 2nd pipe part, the 2nd non-return valve which suppresses the distribution | circulation of the fluid from the one end part side of the 2nd pipe part to the other end part side is provided .
In the first aspect described above , the inner diameter of the second pipe portion is larger than the outer diameter of the first check valve. In the first aspect described above, the first check valve is inserted into the second pipe portion from the opening on the other end portion side of the second pipe portion, passes through the second pipe portion, and enters the first pipe portion. Provided.
In the second aspect described above, an internal thread portion for screwing the first check valve is formed on the inner peripheral surface of the first tube portion on the other end side. In the second aspect described above, the first check valve is inserted into the second pipe part from the opening on the other end side of the second pipe part and installed in the first pipe part through the second pipe part. As possible, the inner diameter of the second pipe portion is larger than the outer diameter of the first check valve.
本発明の第３態様では、セグメントは、前記地下構造物がシールドトンネルの覆工体であり、かつ、前記構造部材がセグメントである、前述の第１態様又は第２態様におけるグラウト材注入用の注入管を備えて、シールドトンネルの覆工体を構成するものである。 In the third aspect of the present invention , the segment is for grout material injection in the first aspect or the second aspect, in which the underground structure is a shield tunnel lining body and the structural member is a segment. An injection pipe is provided to constitute a shield tunnel covering.
本発明の第４態様では、グラウト材注入用の注入管は、地下構造物を構成する構造部材とその周辺の地山との間の空隙に、地下構造物内からグラウト材を注入するために、構造部材に設けられるものである。この注入管は、構造部材の地山側部分に位置して開口する一端部から地下構造物の内方に向かって延びる第１の管部と、第１の管部の他端部に連結される一端部から地下構造物の内方に向かって延びる第２の管部と、を備える。第１の管部内には、第１の管部の一端部側から他端部側への流体の流通を抑制する第１の逆止弁が設けられる。第２の管部内には、第２の管部の一端部側から他端部側への流体の流通を抑制する第２の逆止弁が設けられる。第２の管部は、その内径が、第１の逆止弁の外径よりも大きい。前述の第４態様では、グラウト材の再注入方法は、前述のグラウト材注入用の注入管に第１の逆止弁及び第２の逆止弁が着脱可能に設けられた状態で地下構造物内からのグラウト材の注入を行った後に、再び、地下構造物内から前記空隙にグラウト材を注入する方法である。この方法は、第２の逆止弁を第２の管部から離脱して第２の管部の他端部側の開口から地下構造物内に取り出す第１の工程と、第１の逆止弁を第１の管部から離脱して第２の管部の他端部側の開口から地下構造物内に取り出す第２の工程と、第１の逆止弁を地下構造物内から第２の管部の他端部側の開口に挿入して第１の管部内に装着する第３の工程と、第２の逆止弁を地下構造物内から第２の管部の他端部側の開口に挿入して第１の管部内に装着する第４の工程と、第２の管部の他端部側の開口から第２の管部内及び第１の管部内にグラウト材を供給することにより、地下構造物内から前記空隙にグラウト材を注入する第５の工程と、を含む。 In the fourth aspect of the present invention , the injection pipe for injecting the grout material is for injecting the grout material from the underground structure into the gap between the structural member constituting the underground structure and the surrounding natural ground. It is provided on the structural member. The injection pipe is connected to a first pipe portion that is located on a natural mountain side portion of the structural member and opens from one end portion that opens toward the inside of the underground structure, and the other end portion of the first pipe portion. A second pipe portion extending from one end portion toward the inside of the underground structure. In the 1st pipe part, the 1st non-return valve which suppresses the distribution | circulation of the fluid from the one end part side of the 1st pipe part to the other end part side is provided. In the 2nd pipe part, the 2nd non-return valve which suppresses the distribution | circulation of the fluid from the one end part side of the 2nd pipe part to the other end part side is provided. The inner diameter of the second pipe part is larger than the outer diameter of the first check valve. In the foregoing fourth aspect, reinjection how the grout is underground structure with the first check valve and the second check valve is provided detachably on the injection tube for grout injection described above In this method, after the grout material is injected from inside the object, the grout material is again injected from the underground structure into the gap. The method includes a first step of removing the second check valve from the second pipe portion and taking it out from the opening on the other end side of the second pipe portion into the underground structure, and the first check valve. A second step of removing the valve from the first pipe part and taking it into the underground structure from the opening on the other end side of the second pipe part; and a second step of removing the first check valve from the underground structure. A third step of inserting into the opening on the other end side of the pipe portion and mounting in the first pipe portion, and a second check valve from the underground structure to the other end side of the second pipe portion A fourth step of inserting into the first opening and mounting in the first pipe, and supplying a grout material into the second pipe and the first pipe from the opening on the other end of the second pipe And a fifth step of injecting a grout material into the gap from the inside of the underground structure.
本発明によれば、グラウト材注入用の注入管内に、第１の逆止弁と第２の逆止弁とが設けられる。すなわち、グラウト材注入用の注入管内には逆止弁が２段設置される。これにより、地下構造物に作用する地下水圧が高い場合であっても、地下水などが前述の注入管を介して地下構造物の内部に流入することを２段の逆止弁（第１の逆止弁及び第２の逆止弁）によって抑制することができる。 According to the present invention, the first check valve and the second check valve are provided in the injection pipe for injecting the grout material. That is, two stages of check valves are installed in the injection pipe for injecting the grout material. Thus, even when the underground water pressure acting on the underground structure is high, the two-stage check valve (the first check valve) prevents the underground water or the like from flowing into the underground structure through the aforementioned injection pipe. It can be suppressed by a stop valve and a second check valve).
以下に本発明の実施の形態を図面に基づいて説明する。
図１（Ａ）は、本発明の第１実施形態におけるセグメントの概略構成を示す斜視図である。図１（Ｂ）は、本実施形態におけるセグメントの概略構成を示す平面図であり、セグメントを地山側から見た図である。図２は、本実施形態におけるセグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図であり、図１（Ｂ）のＩ−Ｉ断面図である。図３は、図２の部分Ｐの部分拡大図である。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1A is a perspective view showing a schematic configuration of a segment in the first embodiment of the present invention. FIG. 1B is a plan view showing a schematic configuration of the segment in the present embodiment, and is a view of the segment as viewed from the natural ground side. FIG. 2 is a cross-sectional view showing a schematic configuration of an injection tube for injecting a grout material provided in a segment in the present embodiment, and is a cross-sectional view taken along the line II in FIG. FIG. 3 is a partially enlarged view of a portion P in FIG.
シールド工法では、シールド掘進機（図示せず）の掘進に伴って、円弧状のセグメント（図示せず）をトンネル周方向及びトンネル軸方向に相互に連結することにより、シールドトンネルの筒状の覆工体を形成する。この覆工体を構成するセグメントは、主にコンクリートからなるＲＣセグメント、主に鋼材からなる鋼製セグメント、主にコンクリートと鋼材とからなる合成セグメントであり得る。 In the shield method, as the shield machine (not shown) digs, arc-shaped segments (not shown) are interconnected in the tunnel circumferential direction and the tunnel axis direction, so that the cylindrical cover of the shield tunnel is covered. Form the body. The segment constituting the lining body may be an RC segment mainly made of concrete, a steel segment mainly made of steel, or a synthetic segment mainly made of concrete and steel.
本実施形態ではこれらセグメントに設けられ得るグラウト材注入用の注入管について説明する。
また、以下の説明では、円弧状のセグメントのうち、シールドトンネルの覆工体の内面（内壁面）を構成する表面を「内面」と称する一方、シールドトンネルの覆工体の外面（地山側表面）に対応する表面を「外面」と称する。
In the present embodiment, an injection tube for injecting grout material that can be provided in these segments will be described.
Further, in the following description, the surface constituting the inner surface (inner wall surface) of the shield tunnel covering body is referred to as “inner surface” among the arc-shaped segments, while the outer surface (ground surface side surface) of the shield tunnel covering body is referred to as “inner surface”. ) Is referred to as the “outer surface”.
図１〜図３に示すように、セグメント１には、その内面から外面に貫通するように、グラウト材注入用の注入管１０が設けられており、この注入管１０によってグラウト材注入用の注入孔が形成されている。ここで、注入管１０は、シールドトンネルの覆工体（地下構造物の一例）を構成するセグメント１（構造部材の一例）とその周辺の地山との間の空隙に、覆工体の内部からグラウト材を注入するために、セグメント１に設けられるものである。尚、本実施形態では、グラウト材として、例えばセメント系のグラウト材が用いられる。 As shown in FIGS. 1 to 3, the segment 1 is provided with an injection pipe 10 for injecting a grout material so as to penetrate from the inner surface to the outer surface. A hole is formed. Here, the injection pipe 10 is disposed in the gap between the segment 1 (an example of a structural member) constituting the shield tunnel lining body (an example of an underground structure) and the surrounding natural ground. In order to inject the grout material, the segment 1 is provided. In the present embodiment, for example, a cement grout material is used as the grout material.
注入管１０は金属製又は樹脂製であり、断面形状が円形状である第１の管部１１と、断面形状が円形状である第２の管部１２とを備える。
第１の管部１１は、その一端部１１ａがセグメント１の外面側部分（地山側部分）に位置して開口している。換言すれば、第１の管部１１の一端部１１ａはセグメント１の外周面の地山側部分に位置する開口となっている。第１の管部１１は、その一端部１１ａからセグメント１の内面側（覆工体の内方）に向かって延びており、他端部１１ｂが、第２の管部１２の一端部１２ａに接続されている。ここで、第１の管部１１の他端部１１ｂと第２の管部１２の一端部１２ａとの接続部分では水密性が確保されるように溶接、又は溶着や接着剤による接合が行われて相互に固定される。
The injection tube 10 is made of metal or resin and includes a first tube portion 11 having a circular cross-sectional shape and a second tube portion 12 having a circular cross-sectional shape.
The first pipe portion 11 has one end portion 11a opened at an outer surface side portion (ground mountain side portion) of the segment 1. In other words, the one end portion 11 a of the first tube portion 11 is an opening located in the natural mountain side portion of the outer peripheral surface of the segment 1. The first pipe part 11 extends from one end part 11 a toward the inner surface side of the segment 1 (inward of the covering body), and the other end part 11 b extends to one end part 12 a of the second pipe part 12. It is connected. Here, welding or welding or bonding with an adhesive is performed at the connecting portion between the other end portion 11b of the first tube portion 11 and the one end portion 12a of the second tube portion 12 so as to ensure water tightness. Are fixed to each other.
第２の管部１２は、その一端部１２ａからセグメント１の内面側（覆工体の内方）に向かって延びており、他端部１２ｂが開口している。
本実施形態では、第２の管部１２の一端部１２ａに、その内径を拡径した段差部が形成されており、この段差部に第１の管部１１の他端部１１ｂが挿入されて係合している。すなわち、第２の管部１２の一端部１２ａは、第１の管部１１の他端部１１ｂを内部に収容して相互に係合するソケット部として機能し得る。このソケット部を有する接合構造によって、第１の管部１１と第２の管部１２との接合をより強固なものとすることができる。
The 2nd pipe part 12 is extended toward the inner surface side (inward of a covering body) of the segment 1 from the one end part 12a, and the other end part 12b is opened.
In the present embodiment, a step portion having an enlarged inner diameter is formed at one end portion 12a of the second tube portion 12, and the other end portion 11b of the first tube portion 11 is inserted into the step portion. Is engaged. That is, the one end portion 12a of the second tube portion 12 can function as a socket portion that houses the other end portion 11b of the first tube portion 11 and engages with each other. By the joining structure having the socket portion, the joining between the first tube portion 11 and the second tube portion 12 can be made stronger.
第１の管部１１の他端部１１ｂ側の内周面には雌ねじ部１４が形成されている。この雌ねじ部１４には、後述する第１の逆止弁３０の円筒状の弁本体３１の外周面に形成された雄ねじ部４１が螺合する。第１の管部１１の内周面のうち雌ねじ部１４が形成されていない部分は平滑面１４ａとなっている。
第２の管部１２の他端部１２ｂから中央部にかけての内周面には雌ねじ部１５が形成されている。この雌ねじ部１５には、後述する第２の逆止弁５０の円筒状の弁本体５１の外周面に形成された雄ねじ部６１が螺合する。第２の管部１２の内周面のうち雌ねじ部１５が形成されていない部分は平滑面１６となっている。
A female screw part 14 is formed on the inner peripheral surface of the first pipe part 11 on the other end part 11 b side. A male screw portion 41 formed on the outer peripheral surface of a cylindrical valve body 31 of the first check valve 30 described later is screwed into the female screw portion 14. A portion of the inner peripheral surface of the first tube portion 11 where the female screw portion 14 is not formed is a smooth surface 14a.
A female screw portion 15 is formed on the inner peripheral surface from the other end portion 12b of the second pipe portion 12 to the central portion. A male screw portion 61 formed on the outer peripheral surface of a cylindrical valve body 51 of a second check valve 50 described later is screwed into the female screw portion 15. A portion of the inner peripheral surface of the second pipe portion 12 where the female screw portion 15 is not formed is a smooth surface 16.
ここで、第２の管部１２の内径は、第１の逆止弁３０（弁本体３１）の外径よりも大きい。それゆえ、第１の逆止弁３０を第１の管部１１の他端部１１ｂに着脱可能に固定するときには、第１の逆止弁３０を第２の管部１２の他端部１２ｂ側の開口から第２の管部１２内に挿入して第２の管部１２内を通過させて第１の管部１１の他端部１１ｂまでスムーズに移動させることができる。 Here, the inner diameter of the second pipe portion 12 is larger than the outer diameter of the first check valve 30 (valve body 31). Therefore, when the first check valve 30 is detachably fixed to the other end portion 11b of the first tube portion 11, the first check valve 30 is attached to the other end portion 12b side of the second tube portion 12. It can be inserted into the second tube portion 12 from the opening and passed through the second tube portion 12 and smoothly moved to the other end portion 11 b of the first tube portion 11.
第１の管部１１の外周面と第２の管部１２の外周面とには、それぞれ、水膨張性を有するＯリング（シール部材）１７、１８が設けられている。Ｏリング１７、１８は可撓性を有し、例えばゴム製である。それゆえ、例えばセグメント１がコンクリートを含んで構成される場合には、そのコンクリートと注入管１０の外周面との間にわずかな空隙が形成されても、この空隙を介して、地下水などが覆工体の内部に流入することを抑制することができる。尚、本実施形態では、セグメント１における注入管１０の位置決めのために、図１に示すような補強筋１９がセグメント１に設けられ得る。 O-rings (seal members) 17 and 18 having water expandability are provided on the outer peripheral surface of the first tube portion 11 and the outer peripheral surface of the second tube portion 12, respectively. The O-rings 17 and 18 have flexibility, and are made of, for example, rubber. Therefore, for example, when the segment 1 is configured to include concrete, even if a slight gap is formed between the concrete and the outer peripheral surface of the injection pipe 10, groundwater or the like is covered through the gap. It can suppress flowing into the inside of the work body. In the present embodiment, a reinforcing bar 19 as shown in FIG. 1 can be provided in the segment 1 for positioning the injection tube 10 in the segment 1.
第１の逆止弁３０は、円筒形の弁本体３１と、一対の半円形の弁体３２とを備える。弁体３２は、弾性変形可能なヒンジ部３２ａを介して、弁本体３１の中央部の隔壁３１ａに取り付けられている。弁本体３１の内周面には半円環状の弁座３１ｂが設けられており、この弁座３１ｂに弁体３２が押し付けられることで弁座開口３３が閉じられる。
弁本体３１の外周面には、第１の管部１１の他端部１１ｂの内周面の雌ねじ部１４に螺合する雄ねじ部４１が形成されている。これにより、第１の逆止弁３０を第１の管部１１内に着脱可能に設けることができる。
The first check valve 30 includes a cylindrical valve body 31 and a pair of semicircular valve bodies 32. The valve body 32 is attached to the partition wall 31a at the center of the valve main body 31 via a hinge part 32a that can be elastically deformed. A semi-annular valve seat 31b is provided on the inner peripheral surface of the valve body 31, and the valve seat opening 33 is closed by pressing the valve body 32 against the valve seat 31b.
On the outer peripheral surface of the valve main body 31, a male screw portion 41 that is screwed into the female screw portion 14 on the inner peripheral surface of the other end portion 11 b of the first pipe portion 11 is formed. Thereby, the 1st non-return valve 30 can be provided in the 1st pipe part 11 so that attachment or detachment is possible.
第１の逆止弁３０については、通常時は、弁体３２の平板形状により弁体３２が弁座３１ｂに押し付けられており、そのため弁座開口３３が閉じている（図３にて実線によって示されている弁体３２を参照）。一方、グラウト材注入時は、グラウト材の注入圧によりヒンジ部３２ａが弾性変形して弁体３２が地山側に傾動して弁座開口３３が開く（図３にて一点鎖線によって示されている弁体３２を参照）。グラウト材の注入後は、ヒンジ部３２ａの復元力により弁体３２が弁座３１ｂに接触して弁座開口３３が閉じられて、グラウト材の逆流が抑制される。このようにして、第１の逆止弁３０は、第１の管部１１内において、第１の管部１１の一端部１１ａ側から他端部１１ｂ側への流体の流通を抑制する。 As for the first check valve 30, normally, the valve body 32 is pressed against the valve seat 31 b by the flat plate shape of the valve body 32, so that the valve seat opening 33 is closed (in FIG. 3 by a solid line). See valve body 32 shown). On the other hand, at the time of injecting the grout material, the hinge portion 32a is elastically deformed by the injection pressure of the grout material, the valve body 32 is tilted to the natural ground side, and the valve seat opening 33 is opened (indicated by a one-dot chain line in FIG. 3). (Refer to the valve body 32). After the injection of the grout material, the valve element 32 comes into contact with the valve seat 31b by the restoring force of the hinge portion 32a and the valve seat opening 33 is closed, so that the backflow of the grout material is suppressed. In this way, the first check valve 30 suppresses the flow of fluid from the one end portion 11 a side to the other end portion 11 b side of the first tube portion 11 in the first tube portion 11.
第２の逆止弁５０は、円筒状の弁本体５１と、弁体５２とを、コイルばね５３とを備える。
弁本体５１には、その一端部（地山側端部）に、円環状の弁座５１ａが形成されている。弁座５１ａの中央には弁座開口５１ｂが形成されている。
弁本体５１の外周面のうち、一端部側（地山側）の部分は平滑面６２となっており、残りの部分には前述の雄ねじ部６１が形成されている。これにより、第２の逆止弁５０を第２の管部１２内に着脱可能に設けることができる。弁本体５１の外周面のうちの平滑面６２の部分には、弁本体５１の周方向に延びる環状の溝部６２ａが形成されており、この溝部６２ａ内にシール部材としてのＯリング５４が設けられている。環状部材であるＯリング５４は可撓性を有し、例えばゴム製である。このＯリング５４は水膨張性を有してもよい。ここで、第２の管部１２の内周面の平滑面１６と、弁本体５１の外周面における平滑面６２とが対向する。一方、第２の管部１２の雌ねじ部１５と弁本体５１の雄ねじ部６１とが螺合する。平滑面１６、６２が対向し、かつ、雌ねじ部１５と雄ねじ部６１とが螺合して、平滑面に配置されたＯリング５４によって、第２の逆止弁５０の外周面（特に平滑面６２）と第２の管部１２の内周面（特に平滑面１６）との間がシールされ得るので、高い止水性が安定的に確保される。また、Ｏリング５４の溝部６２ａが弁本体５１側（第２の逆止弁５０側）に形成されているので、後述する、第２の逆止弁５０の取り外し時にＯリング５４の交換が可能となる。
The second check valve 50 includes a cylindrical valve body 51, a valve body 52, and a coil spring 53.
The valve main body 51 is formed with an annular valve seat 51a at one end thereof (end on the natural mountain side). A valve seat opening 51b is formed in the center of the valve seat 51a.
Of the outer peripheral surface of the valve body 51, a portion on one end side (natural mountain side) is a smooth surface 62, and the male screw portion 61 described above is formed on the remaining portion. Thereby, the 2nd non-return valve 50 can be provided in the 2nd pipe part 12 so that attachment or detachment is possible. An annular groove 62a extending in the circumferential direction of the valve body 51 is formed in the smooth surface 62 of the outer peripheral surface of the valve body 51, and an O-ring 54 as a seal member is provided in the groove 62a. ing. The O-ring 54 that is an annular member has flexibility, and is made of, for example, rubber. The O-ring 54 may have water expandability. Here, the smooth surface 16 on the inner peripheral surface of the second pipe portion 12 faces the smooth surface 62 on the outer peripheral surface of the valve body 51. On the other hand, the internal thread portion 15 of the second pipe portion 12 and the external thread portion 61 of the valve body 51 are screwed together. The outer surfaces (especially smooth surfaces) of the second check valve 50 are smoothed by O-rings 54 arranged on the smooth surface with the smooth surfaces 16, 62 facing each other and the female screw portion 15 and the male screw portion 61 screwed together. 62) and the inner peripheral surface (especially the smooth surface 16) of the second pipe portion 12 can be sealed, so that a high water-stopping property is stably secured. Further, since the groove 62a of the O-ring 54 is formed on the valve main body 51 side (second check valve 50 side), the O-ring 54 can be replaced when the second check valve 50, which will be described later, is removed. It becomes.
弁本体５１の中央部には、一端部（地山側端部）に蓋部５５ａを有する円筒状のばね収容部５５が配置されている。ばね収容部５５は、そこから弁本体５１の径方向に放射状に延びる複数の矩形板状の取り付け部５６を介して弁本体５１の内周面に連結されている。ばね収容部５５内には圧縮されたコイルばね５３が挿入されており、その一端部（地山側端部）が蓋部５５ａに係止されている。ばね収容部５５の蓋部５５ａには貫通孔５５ｂが形成されている。 A cylindrical spring accommodating portion 55 having a lid portion 55a at one end portion (end portion on the natural mountain side) is disposed at the central portion of the valve body 51. The spring accommodating portion 55 is connected to the inner peripheral surface of the valve main body 51 via a plurality of rectangular plate-shaped attachment portions 56 extending radially from the radial direction of the valve main body 51 therefrom. A compressed coil spring 53 is inserted into the spring accommodating portion 55, and one end thereof (the end on the natural mountain side) is locked to the lid portion 55a. A through hole 55 b is formed in the lid portion 55 a of the spring accommodating portion 55.
皿ねじ５７は第２の逆止弁５０の弁棒として機能するものであり、その雄ねじ部がコイルばね５３を貫通するようにコイルばね５３に挿入されている。コイルばね５３の他端部は、皿ねじ５７の頭部に係止されている。
皿ねじ５７の雄ねじ部については、その基端側から先端側に向かって順に、コイルばね５３、貫通孔５５ｂ、弁座開口５１ｂ、及び、弁体５２の中央部を貫通して、先端部にナット５８が螺合されている。
The countersunk screw 57 functions as a valve rod of the second check valve 50, and is inserted into the coil spring 53 so that the male screw portion penetrates the coil spring 53. The other end of the coil spring 53 is locked to the head of the countersunk screw 57.
The male screw portion of the countersunk screw 57 passes through the coil spring 53, the through hole 55b, the valve seat opening 51b, and the central portion of the valve body 52 in this order from the base end side to the tip end side, and reaches the tip end portion. A nut 58 is screwed.
弁体５２は弁座開口５１ｂを地山側から塞ぐことが可能な大きさの円盤状である。弁体５２は可撓性を有し、例えばゴム製である。弁体５２は、ばね収容部５５内で圧縮されているコイルばね５３の復元力により、皿ねじ５７及びナット５８を介して、弁座開口５１ｂを塞ぐ方向に付勢されている。 The valve body 52 has a disk shape that can close the valve seat opening 51b from the natural ground side. The valve body 52 has flexibility, for example, is made of rubber. The valve body 52 is urged in a direction to close the valve seat opening 51b through a countersunk screw 57 and a nut 58 by the restoring force of the coil spring 53 compressed in the spring accommodating portion 55.
第２の逆止弁５０については、通常時は、コイルばね５３の復元力により弁体５２が弁座５１ａに押し付けられており、そのため弁座開口５１ｂが閉じている（図３にて実線によって示されている弁体５２を参照）。一方、グラウト材注入時は、グラウト材の注入圧により弁体５２が前述の付勢力に抗して地山側に移動して弁座開口５１ｂが開く（図３にて一点鎖線によって示されている弁体５２を参照）。グラウト材の注入後は、弁体５２が前述の付勢力により弁座５１ａに接触して弁座開口５１ｂが閉じられて、グラウト材の逆流が抑制される。このようにして、第２の逆止弁５０は、第２の管部１２内において、第２の管部１２の一端部１２ａ側から他端部１２ｂ側への流体の流通を抑制する。 As for the second check valve 50, normally, the valve body 52 is pressed against the valve seat 51a by the restoring force of the coil spring 53, so that the valve seat opening 51b is closed (in FIG. 3 by the solid line). See valve body 52 shown). On the other hand, when the grout material is injected, the valve body 52 moves against the above-described biasing force due to the injection pressure of the grout material and the valve seat opening 51b is opened (indicated by the one-dot chain line in FIG. 3). (Refer to the valve body 52). After the injection of the grout material, the valve body 52 comes into contact with the valve seat 51a by the aforementioned urging force, the valve seat opening 51b is closed, and the backflow of the grout material is suppressed. In this way, the second check valve 50 suppresses the flow of fluid from the one end portion 12a side to the other end portion 12b side of the second pipe portion 12 in the second pipe portion 12.
ここで、第２の逆止弁５０は、Ｏリング５４と弁体５２とを有する。それゆえ、第２の逆止弁５０は、第１の逆止弁３０よりも、地下水やグラウト材などの流体の逆流を抑制する能力が高い。第１の逆止弁３０としては、例えばバタフライ式逆止弁や、ウェハ式逆止弁等の小型の構造の低圧に対応可能な逆止弁を採用することが好ましく、また、第２の逆止弁５０としてはディスク式逆止弁等の大型の構造の高圧に対応可能な逆止弁を採用することが好ましい。一般的に高圧に対応可能な逆止弁は、複雑な構造となりより大きな外径となるが、第２の管部１２の内径が第１の管部１１の内径よりも大きいので、第２の逆止弁５０が第１の逆止弁３０に対してより高い圧力に対応可能な逆止弁を採用する場合に好適である。 Here, the second check valve 50 includes an O-ring 54 and a valve body 52. Therefore, the second check valve 50 has a higher ability to suppress the backflow of fluid such as ground water and grout material than the first check valve 30. As the first check valve 30, it is preferable to employ a check valve that can cope with a low pressure of a small structure such as a butterfly check valve or a wafer check valve, for example. As the check valve 50, it is preferable to employ a check valve that can handle a high pressure of a large structure such as a disk type check valve. In general, a check valve that can handle high pressure has a complicated structure and a larger outer diameter. However, since the inner diameter of the second pipe part 12 is larger than the inner diameter of the first pipe part 11, It is suitable when the check valve 50 employs a check valve that can cope with a higher pressure than the first check valve 30.
第２の管部１２の他端部１２ｂの開口には、例えば樹脂製のプラグ６０が螺合され得る。すなわち、第２の管部１２の他端部１２ｂの開口にはプラグ６０が着脱可能に設けられ、これにより、第２の管部１２の他端部１２ｂの開口が閉じられる。 For example, a resin plug 60 can be screwed into the opening of the other end portion 12 b of the second tube portion 12. That is, the plug 60 is detachably provided in the opening of the other end portion 12 b of the second tube portion 12, thereby closing the opening of the other end portion 12 b of the second tube portion 12.
本実施形態では、工場にて、注入管１０が設けられたセグメント１を製造する。このセグメント１を施工現場に搬送し、施工現場にて、注入管１０内に第１の逆止弁３０及び第２の逆止弁５０を設置する。施工現場では、これら逆止弁が設置されたセグメント１を組み立てて覆工体を構築し、この覆工体（セグメント１）とその周辺の地山との間の空隙に、覆工体の内部から注入管１０を介してグラウト材を注入する。このグラウト材注入時は、グラウト材の注入圧により、第１の逆止弁３０及び第２の逆止弁５０がそれぞれ開弁する（図３に示す一点鎖線参照）。グラウト材の注入が終わると、第１の逆止弁３０及び第２の逆止弁５０が前述のように閉弁し、グラウト材の逆流が抑制される。この後、プラグ６０によって、第２の管部１２の他端部１２ｂ側の開口を閉じる。このようにして、覆工体（セグメント１）とその周辺の地山との間の空隙にグラウト材が注入される。 In this embodiment, the segment 1 provided with the injection pipe 10 is manufactured at a factory. The segment 1 is transported to the construction site, and the first check valve 30 and the second check valve 50 are installed in the injection pipe 10 at the construction site. At the construction site, the lining body is constructed by assembling the segment 1 in which these check valves are installed, and in the gap between the lining body (segment 1) and the surrounding natural ground, The grout material is injected through the injection tube 10. At the time of injecting the grout material, the first check valve 30 and the second check valve 50 are each opened by the injection pressure of the grout material (see the one-dot chain line shown in FIG. 3). When the injection of the grout material is finished, the first check valve 30 and the second check valve 50 are closed as described above, and the backflow of the grout material is suppressed. Thereafter, the plug 60 closes the opening on the other end 12 b side of the second pipe portion 12. In this way, the grout material is injected into the gap between the lining body (segment 1) and the surrounding natural ground.
ところで、前述のように覆工体（セグメント１）とその周辺の地山との間の空隙にグラウト材が注入されて、ある程度の期間が経過した後に、当該覆工体の上方の地表面が沈下した場合、あるいは、覆工体におけるセグメント間のジョイントにて地下水などの漏水が発生した場合などには、覆工体（セグメント１）とその周辺の地山との間に新たな空隙が形成されている可能性が高い。この空隙にグラウト材を注入するために、以下のグラウト材の再注入方法が採られ得る。 By the way, after the grout material is injected into the gap between the lining body (segment 1) and the surrounding natural ground as described above, and after a certain period of time, the ground surface above the lining body is In case of subsidence or leakage of groundwater etc. at the joint between segments in the lining body, a new gap is formed between the lining body (segment 1) and the surrounding natural ground. It is likely that In order to inject the grout material into the gap, the following grout material reinjection method may be employed.
このグラウト材の再注入方法は、詳しくは、注入管１０に第１の逆止弁３０及び第２の逆止弁５０が着脱可能に設けられた状態で覆工体の内部からのグラウト材の注入を行った後に、再び、覆工体の内部から前記空隙にグラウト材を注入する方法である。 This grout material reinjection method is more specifically described in the state that the first check valve 30 and the second check valve 50 are detachably provided on the injection pipe 10 so that the grout material from the inside of the lining body is removed. After the injection, the grout material is again injected from the inside of the covering body into the gap.
このグラウト材の再注入方法では、まず、第２の管部１２の他端部１２ｂ側の開口に設けられたプラグ６０を取り外す。
次に、第２の逆止弁５０を第２の管部１２から離脱して第２の管部１２の他端部１２ｂ側の開口から覆工体の内部に取り出す（第１の工程）。この工程は、第２の管部１２内に残っているグラウト材を除去しながら行ってもよい。
In this grout material reinjection method, first, the plug 60 provided in the opening on the other end 12b side of the second tube portion 12 is removed.
Next, the second check valve 50 is detached from the second pipe portion 12 and taken out from the opening on the other end portion 12b side of the second pipe portion 12 into the covering body (first step). This step may be performed while removing the grout material remaining in the second pipe portion 12.
次に、第１の逆止弁３０を第１の管部１１から離脱して第２の管部１２の他端部１２ｂ側の開口から覆工体の内部に取り出す（第２の工程）。この工程は、第１の管部１１内及び／又は第２の管部１２内に残っているグラウト材を除去しながら行ってもよい。
次に、必要であれば、第１の管部１１内及び／又は第２の管部１２内に残っているグラウト材を除去する（第６の工程）。
Next, the first check valve 30 is detached from the first pipe portion 11 and taken out from the opening on the other end portion 12b side of the second pipe portion 12 into the covering body (second step). This step may be performed while removing the grout material remaining in the first tube portion 11 and / or the second tube portion 12.
Next, if necessary, the grout material remaining in the first tube portion 11 and / or the second tube portion 12 is removed (sixth step).
次に、第１の逆止弁３０を覆工体の内部から第２の管部１２の他端部１２ｂ側の開口に挿入して第１の管部１１内に装着する（第３の工程）。
次に、第２の逆止弁５０を覆工体の内部から第２の管部１２の他端部１２ｂ側の開口に挿入して第２の管部１２内に装着する（第４の工程）。
Next, the first check valve 30 is inserted into the opening on the other end 12b side of the second pipe portion 12 from the inside of the covering body and mounted in the first pipe portion 11 (third step). ).
Next, the second check valve 50 is inserted into the opening on the other end 12b side of the second pipe portion 12 from the inside of the covering body and mounted in the second pipe portion 12 (fourth step). ).
次に、第２の管部１２の他端部１２ｂ側の開口から第２の管部１２内及び第１の管部１１内にグラウト材を供給することにより、覆工体の内部から前記空隙にグラウト材を注入する（第５の工程）。
グラウト材の注入が終了すると、プラグ６０によって、第２の管部１２の他端部１２ｂ側の開口を閉じる。
以上のようにして、グラウト材の再注入が行われる。
Next, by supplying a grout material into the second tube portion 12 and the first tube portion 11 from the opening on the other end portion 12b side of the second tube portion 12, the gap is formed from the inside of the covering body. A grout material is injected into the substrate (fifth step).
When the injection of the grout material is completed, the opening on the other end 12b side of the second pipe portion 12 is closed by the plug 60.
The grout material is reinjected as described above.
尚、前述のグラウト材の再注入方法において、第１の逆止弁３０を第１の管部１１から離脱することが不要であれば、前述の第２の工程及び第３の工程を省略してもよい。 In the above-described grout material reinjection method, if it is not necessary to separate the first check valve 30 from the first pipe portion 11, the second and third steps are omitted. May be.
本実施形態によれば、覆工体（地下構造物）を構成するセグメント１（構造部材）とその周辺の地山との間の空隙に、覆工体内からグラウト材を注入するために、セグメント１に設けられるグラウト材注入用の注入管１０は、セグメント１の地山側部分に位置して開口する一端部１１ａから覆工体の内方に向かって延びる第１の管部１１と、第１の管部１１の他端部１１ｂに連結される一端部１２ａから覆工体の内方に向かって延びる第２の管部１２と、を備える。第１の管部１１内には、第１の管部１１の一端部１１ａ側から他端部１１ｂ側への流体の流通を抑制する第１の逆止弁３０が設けられる。第２の管部１２内には、第２の管部１２の一端部１２ａ側から他端部１２ｂ側への流体の流通を抑制する第２の逆止弁５０が設けられる。第２の管部１２は、その内径が、第１の逆止弁３０の外径よりも大きい。これにより、覆工体に作用する地下水圧が高い場合であっても、地下水などが注入管１０を介して覆工体の内部に流入することを２段の逆止弁（第１の逆止弁３０及び第２の逆止弁５０）によって抑制することができる。 According to this embodiment, in order to inject the grout material from the covering body into the gap between the segment 1 (structural member) constituting the covering body (underground structure) and the surrounding natural ground, the segment An infusion pipe 10 for injecting a grout material provided in 1 includes a first pipe section 11 extending from the one end section 11a that is located at the ground mountain side portion of the segment 1 and that opens toward the inside of the covering body. A second pipe portion 12 extending from the one end portion 12a connected to the other end portion 11b of the pipe portion 11 toward the inside of the covering body. In the 1st pipe part 11, the 1st non-return valve 30 which suppresses the distribution | circulation of the fluid from the one end part 11a side of the 1st pipe part 11 to the other end part 11b side is provided. In the 2nd pipe part 12, the 2nd non-return valve 50 which suppresses the distribution | circulation of the fluid from the one end part 12a side of the 2nd pipe part 12 to the other end part 12b side is provided. The inner diameter of the second pipe portion 12 is larger than the outer diameter of the first check valve 30. Thereby, even if the underground water pressure acting on the lining body is high, the two-stage check valve (first check valve) prevents the groundwater or the like from flowing into the lining body via the injection pipe 10. It can be suppressed by the valve 30 and the second check valve 50).
また本実施形態によれば、第１の逆止弁３０は、第２の管部１２の他端部１２ｂ側の開口から第２の管部１２内に挿入されて第２の管部１２内を経て第１の管部１１内に設けられる。これにより、第１の逆止弁３０を覆工体の内部から第１の管部１１内に取り付けることができ、また、この取り付けられた第１の逆止弁３０を第１の管部１１内から覆工体内へと取り外すことができる。 In addition, according to the present embodiment, the first check valve 30 is inserted into the second pipe portion 12 through the opening on the other end portion 12b side of the second pipe portion 12 and is inserted into the second pipe portion 12. And is provided in the first tube portion 11. Thereby, the 1st check valve 30 can be attached in the 1st pipe part 11 from the inside of a covering body, and this 1st check valve 30 attached to the 1st pipe part 11 can be attached. It can be removed from the inside into the lining.
また本実施形態によれば、第１の管部１１の他端部１１ｂ側の内周面には、第１の逆止弁３０が螺合するための雌ねじ部１４が形成されている。これにより、第１の逆止弁３０を簡易に第１の管部１１に着脱可能に設置することができる。 Moreover, according to this embodiment, the internal thread part 14 for the 1st non-return valve 30 to screw together is formed in the internal peripheral surface at the other end part 11b side of the 1st pipe part 11. As shown in FIG. Thereby, the 1st non-return valve 30 can be easily installed in the 1st pipe part 11 so that attachment or detachment is possible.
また本実施形態によれば、第２の逆止弁５０には、その外周面と第２の管部１２の内周面との間をシールするＯリング５４（シール部材）が設けられている。これにより、地下水などが、第２の逆止弁５０の外周面と第２の管部１２の内周面との間の間隙を通って、覆工体の内部に流入することを抑制することができる。 According to the present embodiment, the second check valve 50 is provided with an O-ring 54 (seal member) that seals between the outer peripheral surface of the second check valve 50 and the inner peripheral surface of the second pipe portion 12. . Thereby, it suppresses that groundwater etc. flow into the inside of a covering body through the clearance gap between the outer peripheral surface of the 2nd non-return valve 50, and the internal peripheral surface of the 2nd pipe part 12. Can do.
また本実施形態によれば、セグメント１は、グラウト材注入用の注入管１０を備えてシールドトンネルの覆工体を構成する。これにより、グラウト材用の注入孔からの漏水などが少ないセグメント１を提供することができる。 Further, according to the present embodiment, the segment 1 includes the injection pipe 10 for injecting the grout material and constitutes a shield tunnel covering body. Thereby, the segment 1 with few leaks etc. from the injection hole for grout materials can be provided.
また本実施形態によれば、グラウト材の再注入方法は、グラウト材注入用の注入管１０に第１の逆止弁３０及び第２の逆止弁５０が着脱可能に設けられた状態で覆工体内（地下構造物内）からのグラウト材の注入を行った後に、再び、覆工体内から前記空隙にグラウト材を注入する方法である。この方法は、第２の逆止弁５０を第２の管部１２から離脱して第２の管部１２の他端部１２ｂ側の開口から覆工体内に取り出す第１の工程と、第１の逆止弁３０を第１の管部１１から離脱して第２の管部１２の他端部１２ｂ側の開口から覆工体内に取り出す第２の工程と、第１の逆止弁３０を覆工体内から第２の管部１２の他端部１２ｂ側の開口に挿入して第１の管部１１内に装着する第３の工程と、第２の逆止弁５０を覆工体内から第２の管部１２の他端部１２ｂ側の開口に挿入して第２の管部１２内に装着する第４の工程と、第２の管部１２の他端部１２ｂ側の開口から第２の管部１２内及び第１の管部１１内にグラウト材を供給することにより、覆工体内から前記空隙にグラウト材を注入する第５の工程と、を含む。それゆえ、覆工体の上方の地表面が沈下した場合、あるいは、覆工体におけるセグメント間のジョイントにて地下水などの漏水が発生した場合などには、覆工体（セグメント１）とその周辺の地山との間の形成された新たな空隙にグラウト材を迅速に注入することができる。 In addition, according to the present embodiment, the grout material reinjection method is performed in a state where the first check valve 30 and the second check valve 50 are detachably provided in the injection pipe 10 for grout material injection. In this method, after the grout material is injected from the inside of the work body (underground structure), the grout material is again injected from the cover body into the gap. This method includes a first step of removing the second check valve 50 from the second pipe portion 12 and taking it out from the opening on the other end portion 12b side of the second pipe portion 12 into the covering body, The second step of removing the check valve 30 from the first pipe portion 11 and taking it out from the opening on the other end 12b side of the second pipe portion 12 into the covering body, and the first check valve 30 A third step of inserting the second tube portion 12 into the opening on the other end 12b side of the second pipe portion 12 and mounting it in the first tube portion 11 and the second check valve 50 from the cover body. The fourth step of inserting into the opening on the other end portion 12b side of the second tube portion 12 and mounting it in the second tube portion 12, and the opening on the other end portion 12b side of the second tube portion 12 A fifth step of injecting the grout material into the gap from the lining body by supplying the grout material into the second tube portion 12 and the first tube portion 11. Therefore, when the ground surface above the lining body sinks or when water leakage such as groundwater occurs at the joint between segments in the lining body, the lining body (segment 1) and its surroundings It is possible to quickly inject the grout material into the new gap formed between the ground and the natural ground.
また本実施形態によれば、グラウト材の再注入方法は、前記第３の工程に先立って、第１の管部１１内及び／又は前記第２の管部１２内に残っているグラウト材を除去する第６の工程を更に含む。これにより、グラウト材の再注入時における第１の逆止弁３０及び第２の逆止弁５０の交換作業をスムーズに行うことができる。 In addition, according to the present embodiment, the grout material reinjection method uses the grout material remaining in the first tube portion 11 and / or the second tube portion 12 prior to the third step. A sixth step of removing is further included. Thereby, the exchange work of the 1st check valve 30 and the 2nd check valve 50 at the time of reinjection of grout material can be performed smoothly.
また本実施形態によれば、グラウト材の再注入方法は、グラウト材注入用の注入管１０に第１の逆止弁３０が設けられ、かつ、第２の逆止弁５０が着脱可能に設けられた状態で覆工体内（地下構造物内）からのグラウト材の注入を行った後に、再び、覆工体内から前記空隙にグラウト材を注入する方法である。この方法は、第２の逆止弁５０を第２の管部１２から離脱して第２の管部１２の他端部１２ｂ側の開口から覆工体内に取り出す工程（第１の工程）と、第２の逆止弁５０を覆工体内から第２の管部１２の他端部１２ｂ側の開口に挿入して第２の管部１２内に装着する工程（第４の工程）と、第２の管部１２の他端部１２ｂ側の開口から第２の管部１２内及び第１の管部１１内にグラウト材を供給することにより、覆工体内から前記空隙にグラウト材を注入する工程（第５の工程）と、を含む。これにより、グラウト材の再注入時に第１の逆止弁３０の交換などが不要である場合には、迅速に再注入の準備を行うことができる。 Further, according to the present embodiment, the grout material reinjection method is such that the first check valve 30 is provided in the injection pipe 10 for grout material injection, and the second check valve 50 is detachably provided. In this state, after the grout material is injected from the lining body (inside the underground structure), the grouting material is again injected into the gap from the lining body. This method includes a step of removing the second check valve 50 from the second pipe portion 12 and taking it out from the opening on the other end portion 12b side of the second pipe portion 12 (first step). Inserting the second check valve 50 into the opening on the other end portion 12b side of the second pipe portion 12 from the covering body and mounting the second check valve 50 in the second pipe portion 12 (fourth step); By supplying the grout material into the second tube portion 12 and the first tube portion 11 from the opening on the other end 12b side of the second tube portion 12, the grout material is injected into the gap from the lining body. And a step (fifth step). Thereby, when it is not necessary to replace the first check valve 30 at the time of reinjecting the grout material, preparation for reinjection can be made quickly.
また本実施形態によれば、グラウト材の再注入方法は、第２の逆止弁５０を第２の管部１２内に装着する工程（第４の工程）に先立って、第２の管部１２内に残っているグラウト材を除去する工程（第６の工程）を更に含む。これにより、グラウト材の再注入時における第２の逆止弁５０の交換作業をスムーズに行うことができる。 In addition, according to the present embodiment, the grout material reinjection method includes the second pipe portion prior to the step of mounting the second check valve 50 in the second pipe portion 12 (fourth step). 12 further includes a step (sixth step) of removing the grout material remaining in the inside. Thereby, the replacement | exchange operation | work of the 2nd non-return valve 50 at the time of reinjection of grout material can be performed smoothly.
尚、本実施形態では、覆工体（セグメントリング）を構成する複数のセグメント１のうち、全てのセグメント１に注入管１０が設けられてもよい。又は、覆工体（セグメントリング）を構成する複数のセグメント１のうち、覆工体（セグメントリング）の上部を構成する１つ以上のセグメント１に注入管１０が設けられてもよい。 In addition, in this embodiment, the injection pipe 10 may be provided in all the segments 1 among the some segments 1 which comprise a lining body (segment ring). Or the injection pipe 10 may be provided in the 1 or more segment 1 which comprises the upper part of a covering body (segment ring) among the some segments 1 which comprise a covering body (segment ring).
図４は、本発明の第２実施形態におけるＲＣセグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図である。
図１〜図３に示した第１実施形態と異なる点について説明する。
FIG. 4 is a cross-sectional view showing a schematic configuration of an injection tube for grout material injection provided in the RC segment in the second embodiment of the present invention.
A different point from 1st Embodiment shown in FIGS. 1-3 is demonstrated.
ＲＣセグメント２には、その内面から外面に貫通するように注入管１０が埋設されており、この注入管１０によってグラウト材注入用の注入孔が形成されている。
注入管１０は、前述の第１の管部１１及び第２の管部１２に加えて、板状のフランジ部１３を備える。フランジ部１３はいわゆる外フランジであり、第１の管部１１の一端部１１ａに溶接固定された矩形の板状部材によって構成されている。尚、この板状部材の中央部に形成された開口が、第１の管部１１の一端部１１ａの開口に連続している。
An injection tube 10 is embedded in the RC segment 2 so as to penetrate from the inner surface to the outer surface, and an injection hole for grout material injection is formed by the injection tube 10.
The injection tube 10 includes a plate-like flange portion 13 in addition to the first tube portion 11 and the second tube portion 12 described above. The flange portion 13 is a so-called outer flange, and is constituted by a rectangular plate-like member that is welded and fixed to the one end portion 11 a of the first tube portion 11. Note that the opening formed in the central portion of the plate-like member is continuous with the opening of the one end portion 11 a of the first tube portion 11.
図５は、本発明の第３実施形態における鋼製セグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図である。
図１〜図３に示した第１実施形態と異なる点について説明する。
FIG. 5 is a cross-sectional view showing a schematic configuration of an injection pipe for injecting a grout material provided in a steel segment in the third embodiment of the present invention.
A different point from 1st Embodiment shown in FIGS. 1-3 is demonstrated.
本実施形態では、注入管１０の第１の管部１１の一端部１１ａが、鋼製セグメント７１のスキンプレート７２に溶接固定されている。ここで、スキンプレート７２の地山側表面は、鋼製セグメント７１の外面に対応する。
スキンプレート７２には、第１の管部１１の一端部１１ａの開口に連続するように開口部７２ａが貫通形成されている。
第１の管部１１については、第１実施形態に比べて、長さが短縮されている。
In the present embodiment, one end portion 11 a of the first tube portion 11 of the injection tube 10 is fixed to the skin plate 72 of the steel segment 71 by welding. Here, the natural ground surface of the skin plate 72 corresponds to the outer surface of the steel segment 71.
An opening 72 a is formed through the skin plate 72 so as to be continuous with the opening of the one end 11 a of the first tube portion 11.
About the 1st pipe part 11, compared with 1st Embodiment, length is shortened.
図６は、本発明の第４実施形態における合成セグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図である。
図１〜図３に示した第１実施形態と異なる点について説明する。
FIG. 6 is a cross-sectional view showing a schematic configuration of an injection tube for injecting a grout material provided in a synthetic segment in the fourth embodiment of the present invention.
A different point from 1st Embodiment shown in FIGS. 1-3 is demonstrated.
合成セグメント８１には、前述のＲＣセグメント２と同様に注入管１０が埋設されており、この注入管１０によってグラウト材注入用の注入孔が形成されている。
本実施形態では、注入管１０の第１の管部１１の一端部１１ａが、合成セグメント８１のスキンプレート８２に溶接固定されている。ここで、スキンプレート８２の地山側表面は、合成セグメント８１の外面に対応する。
スキンプレート８２には、第１の管部１１の一端部１１ａの開口に連続するように開口部８２ａが貫通形成されている。
An injection tube 10 is embedded in the synthetic segment 81 in the same manner as the RC segment 2 described above, and an injection hole for injecting a grout material is formed by the injection tube 10.
In the present embodiment, one end portion 11 a of the first tube portion 11 of the injection tube 10 is fixed by welding to the skin plate 82 of the synthetic segment 81. Here, the natural mountain side surface of the skin plate 82 corresponds to the outer surface of the composite segment 81.
An opening 82 a is formed through the skin plate 82 so as to be continuous with the opening of the one end 11 a of the first tube portion 11.
図７は、本発明の第５実施形態におけるＲＣセグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図である。
図４に示した第２実施形態と異なる点について説明する。
FIG. 7 is a cross-sectional view showing a schematic configuration of an injection pipe for injecting a grout material provided in an RC segment in the fifth embodiment of the present invention.
Differences from the second embodiment shown in FIG. 4 will be described.
本実施形態では、注入管１０の第１の管部１１の一端部１１ａの開口が、例えば樹脂製のキャップ２０で塞がれた状態で、ＲＣセグメント２に埋設されている。ここで、キャップ２０と、キャップ２０より地山側に位置するコンクリート２１とが、本発明の「閉口部」に対応して、第１の管部１１の一端部１１ａの開口を塞いでいる。
本実施形態では、第１の逆止弁３０及び第２の逆止弁５０が注入管１０内に設けられていない状態で、ＲＣセグメント２を組み立てて覆工体を構築する。
In the present embodiment, the opening of the one end portion 11a of the first tube portion 11 of the injection tube 10 is embedded in the RC segment 2 in a state where the opening is closed with a resin cap 20, for example. Here, the cap 20 and the concrete 21 located closer to the ground than the cap 20 close the opening of the one end portion 11a of the first pipe portion 11 corresponding to the “closed portion” of the present invention.
In the present embodiment, the RC segment 2 is assembled to construct a lining body in a state where the first check valve 30 and the second check valve 50 are not provided in the injection pipe 10.
本実施形態では、例えば、シールド掘進機の後胴部に設けられたグラウト材注入手段によって、覆工体（ＲＣセグメント２）とその周辺の地山との間の空隙にグラウト材が注入される。この注入後に、当該覆工体の上方の地表面が沈下した場合、あるいは、覆工体におけるセグメント間のジョイントにて地下水などの漏水が発生した場合などには、覆工体（ＲＣセグメント２）とその周辺の地山との間に新たな空隙が形成されている可能性が高い。この空隙にグラウト材を注入するために、以下のグラウト材の再注入方法が採られ得る。 In the present embodiment, for example, the grout material is injected into the gap between the lining body (RC segment 2) and the surrounding natural ground by the grout material injection means provided in the rear trunk portion of the shield machine. . When the ground surface above the lining body sinks after this injection, or when leakage of groundwater or the like occurs at the joint between segments in the lining body, the lining body (RC segment 2) There is a high possibility that a new air gap is formed between the ground and the surrounding natural ground. In order to inject the grout material into the gap, the following grout material reinjection method may be employed.
本実施形態におけるグラウト材の再注入方法では、まず、図８に示すように、キャップ２０及びコンクリート２１（閉口部）を覆工体の内部から注入管１０を介して穿孔することにより、ＲＣセグメント２にグラウト材注入用の注入孔２４を形成する。ここで、図８は、本実施形態におけるＲＣセグメント２にグラウト材注入用の注入孔２４が穿孔された状態を示す断面図である。この注入孔２４の形成により、キャップ２０及びコンクリート２１からなる閉口部が実質的に取り除かれて、前記空隙と第１の管部１１の一端部１１ａの開口とが注入孔２４を介して連通する。すなわち、注入孔２４が、前記空隙と第１の管部１１の一端部１１ａの開口とを連通する連通孔となる。 In the grout material reinjection method according to the present embodiment, first, as shown in FIG. An injection hole 24 for injecting grout material is formed in 2. Here, FIG. 8 is a cross-sectional view showing a state in which the injection hole 24 for injecting the grout material is formed in the RC segment 2 in the present embodiment. By forming the injection hole 24, the closing part made of the cap 20 and the concrete 21 is substantially removed, and the gap and the opening of the one end part 11 a of the first pipe part 11 communicate with each other through the injection hole 24. . That is, the injection hole 24 is a communication hole that communicates the gap and the opening of the one end portion 11 a of the first tube portion 11.
これ以降は、前述の第１実施形態における第３の工程〜第５の工程と同様に、注入管１０内に第１の逆止弁３０及び第２の逆止弁５０を装着し、グラウト材を覆工体内から注入管１０を介して前記空隙に注入する。この注入が終わった後には、プラグ６０によって、第２の管部１２の他端部１２ｂ側の開口を閉じる。
以上のようにして、グラウト材の再注入が行われる。
Thereafter, as in the third to fifth steps in the first embodiment described above, the first check valve 30 and the second check valve 50 are mounted in the injection pipe 10, and the grout material is attached. Is injected into the gap through the injection tube 10 from the lining body. After this injection is completed, the plug 60 closes the opening on the other end 12b side of the second tube portion 12.
The grout material is reinjected as described above.
特に本実施形態によれば、注入管１０は、第１の管部１１の一端部１１ａの開口を塞ぐ閉口部（キャップ２０及びコンクリート２１）を備える。この閉口部は、第１の管部１１内に第１の逆止弁３０が装着されるに先立って、かつ、第２の管部１２内に第２の逆止弁５０が装着されるに先立って、取り除かれる（図７参照）。これにより、グラウト材の再注入の必要性に応じてＲＣセグメント２に注入孔２４を形成すればよいので、ＲＣセグメント２に形成される貫通孔を必要最小限に抑えることができ、ひいては、地下水などが覆工体内に流入することを抑制することができる。 In particular, according to the present embodiment, the injection tube 10 includes a closing portion (cap 20 and concrete 21) that closes the opening of the one end portion 11a of the first tube portion 11. This closing portion is formed before the first check valve 30 is mounted in the first pipe portion 11 and the second check valve 50 is mounted in the second pipe portion 12. Prior to removal, see FIG. Accordingly, since the injection hole 24 may be formed in the RC segment 2 in accordance with the necessity of reinjection of the grout material, the through-hole formed in the RC segment 2 can be suppressed to the minimum necessary. Etc. can be prevented from flowing into the lining body.
図９は、本発明の第６実施形態における鋼製セグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図である。
図７及び図８に示した第５実施形態と異なる点について説明する。
FIG. 9 is a cross-sectional view showing a schematic configuration of an injection pipe for injecting a grout material provided in a steel segment in the sixth embodiment of the present invention.
Differences from the fifth embodiment shown in FIGS. 7 and 8 will be described.
本実施形態では、注入管１０の第１の管部１１の一端部１１ａが、鋼製セグメント７１のスキンプレート７２に溶接固定されている。ここで、スキンプレート７２の地山側表面は、鋼製セグメント７１の外面に対応する。尚、第１の管部１１については、第５実施形態に比べて、長さが短縮されている。
スキンプレート７２のうち、第１の管部１１の一端部１１ａの開口を塞ぐ部分が本発明の「閉口部」に対応する。
本実施形態では、第１の逆止弁３０及び第２の逆止弁５０が注入管１０内に設けられていない状態で、鋼製セグメント７１を組み立てて覆工体を構築する。
In the present embodiment, one end portion 11 a of the first tube portion 11 of the injection tube 10 is fixed to the skin plate 72 of the steel segment 71 by welding. Here, the natural ground surface of the skin plate 72 corresponds to the outer surface of the steel segment 71. In addition, about the 1st pipe part 11, compared with 5th Embodiment, length is shortened.
A portion of the skin plate 72 that closes the opening of the one end portion 11a of the first tube portion 11 corresponds to the “closed portion” of the present invention.
In this embodiment, a steel segment 71 is assembled to construct a lining body in a state where the first check valve 30 and the second check valve 50 are not provided in the injection pipe 10.
本実施形態におけるグラウト材の再注入方法では、まず、スキンプレート７２のうち、第１の管部１１の一端部１１ａの開口を塞ぐ部分（閉口部）を覆工体の内部から注入管１０を介して穿孔することにより、鋼製セグメント７１に、前述の開口部７２ａと同様の、グラウト材注入用の注入孔（図示せず）を形成する。この注入孔の形成により、スキンプレート７２の一部である閉口部が実質的に取り除かれて、前記空隙と第１の管部１１の一端部１１ａの開口とが注入孔を介して連通する。すなわち、この注入孔が、前記空隙と第１の管部１１の一端部１１ａの開口とを連通する連通孔となる。
これ以降については、前述の第５実施形態と同様であるので、その説明を省略する。
In the grout material reinjection method in the present embodiment, first, the injection tube 10 is inserted from the inside of the covering body into the portion (closed portion) of the skin plate 72 that closes the opening of the one end portion 11a of the first tube portion 11. By punching through, an injection hole (not shown) for injecting grout material is formed in the steel segment 71, similar to the opening 72a described above. By forming the injection hole, the closed portion which is a part of the skin plate 72 is substantially removed, and the gap and the opening of the one end portion 11a of the first tube portion 11 communicate with each other through the injection hole. That is, this injection hole is a communication hole that communicates the gap and the opening of the one end portion 11 a of the first tube portion 11.
Since the subsequent steps are the same as those in the fifth embodiment, the description thereof is omitted.
図１０は、本発明の第７実施形態における合成セグメントに設けられたグラウト材注入用の注入管の概略構成を示す断面図である。
図７及び図８に示した第５実施形態と異なる点について説明する。
FIG. 10 is a cross-sectional view showing a schematic configuration of an injection tube for injecting a grout material provided in a synthetic segment in the seventh embodiment of the present invention.
Differences from the fifth embodiment shown in FIGS. 7 and 8 will be described.
本実施形態では、注入管１０の第１の管部１１の一端部１１ａが、合成セグメント８１のスキンプレート８２に溶接固定されている。ここで、スキンプレート８２の地山側表面は、合成セグメント８１の外面に対応する。
スキンプレート８２のうち、第１の管部１１の一端部１１ａの開口を塞ぐ部分が本発明の「閉口部」に対応する。
本実施形態では、第１の逆止弁３０及び第２の逆止弁５０が注入管１０内に設けられていない状態で、合成セグメント８１を組み立てて覆工体を構築する。
In the present embodiment, one end portion 11 a of the first tube portion 11 of the injection tube 10 is fixed by welding to the skin plate 82 of the synthetic segment 81. Here, the natural mountain side surface of the skin plate 82 corresponds to the outer surface of the composite segment 81.
A portion of the skin plate 82 that closes the opening of the one end portion 11a of the first tube portion 11 corresponds to the “closed portion” of the present invention.
In the present embodiment, the composite segment 81 is assembled to construct a covering body in a state where the first check valve 30 and the second check valve 50 are not provided in the injection pipe 10.
本実施形態におけるグラウト材の再注入方法では、まず、スキンプレート８２のうち、第１の管部１１の一端部１１ａの開口を塞ぐ部分（閉口部）を覆工体の内部から注入管１０を介して穿孔することにより、合成セグメント８１に、前述の開口部８２ａと同様の、グラウト材注入用の注入孔（図示せず）を形成する。この注入孔の形成により、スキンプレート８２の一部である閉口部が実質的に取り除かれて、前記空隙と第１の管部１１の一端部１１ａの開口とが注入孔を介して連通する。すなわち、この注入孔が、前記空隙と第１の管部１１の一端部１１ａの開口とを連通する連通孔となる。
これ以降については、前述の第５実施形態と同様であるので、その説明を省略する。
In the grout material reinjection method in the present embodiment, first, the injection tube 10 is connected to the portion of the skin plate 82 that closes the opening of the one end portion 11a of the first tube portion 11 (closed portion) from the inside of the covering body. By punching through, an injection hole (not shown) for injecting the grout material is formed in the synthetic segment 81, similar to the opening 82a described above. By forming the injection hole, the closed portion which is a part of the skin plate 82 is substantially removed, and the gap and the opening of the one end portion 11a of the first tube portion 11 communicate with each other through the injection hole. That is, this injection hole is a communication hole that communicates the gap and the opening of the one end portion 11 a of the first tube portion 11.
Since the subsequent steps are the same as those in the fifth embodiment, the description thereof is omitted.
尚、前述の第５〜第７実施形態では、グラウト材の再注入時に、第１の管部１１の一端部１１ａの開口を塞ぐ閉口部を取り除くようにしたが、閉口部を取り除く時期はこれに限らない。 In the fifth to seventh embodiments described above, the closing portion that closes the opening of the one end portion 11a of the first pipe portion 11 is removed at the time of reinjecting the grout material. Not limited to.
また、第１〜第７実施形態の第２の逆止弁５０における弁体及び弁座の構成を第１の逆止弁３０の弁体３２及び弁座３１ｂと同様にして、第１の逆止弁３０と同様に開弁・閉弁可能に構成してもよい。この場合には、第２の逆止弁５０の円筒状の弁本体５１の他端部側の開口（すなわち弁座開口５１ｂとは反対の側の開口）を塞ぐキャップ部材（図示せず）を弁本体５１に着脱可能に取り付けることで、グラウト材注入後の第２の逆止弁５０での漏水などを抑制することができる。 Further, the configuration of the valve body and the valve seat in the second check valve 50 of the first to seventh embodiments is the same as that of the valve body 32 and the valve seat 31b of the first check valve 30, and the first check valve 50 is used. As with the stop valve 30, the valve may be opened and closed. In this case, a cap member (not shown) that closes the opening on the other end side of the cylindrical valve main body 51 of the second check valve 50 (that is, the opening on the side opposite to the valve seat opening 51b). By detachably attaching to the valve main body 51, it is possible to suppress water leakage or the like at the second check valve 50 after the injection of the grout material.
また、前述の第１〜第７実施形態では、地下構造物の一例としてシールドトンネルの覆工体を挙げて説明したが、この覆工体の断面形状は円形状に限らず、楕円状、矩形状、その他の任意の断面形状であり得る。また、地下構造物はシールドトンネルの覆工体に限らず、例えばケーソンであり得る。また、地下構造物を構成する構造部材としてセグメント（セグメント１、ＲＣセグメント２、鋼製セグメント７１、合成セグメント８１）を挙げて説明したが、構造部材はこれに限らない。
尚、出願当初の請求項は以下の通りであった。
〔請求項１〕
地下構造物を構成する構造部材とその周辺の地山との間の空隙に、前記地下構造物内からグラウト材を注入するために、前記構造部材に設けられる注入管であって、
前記構造部材の地山側部分に位置して開口する一端部から前記地下構造物の内方に向かって延びる第１の管部と、
前記第１の管部の他端部に連結される一端部から前記地下構造物の内方に向かって延びる第２の管部と、
を備え、
前記第１の管部内には、前記第１の管部の一端部側から他端部側への流体の流通を抑制する第１の逆止弁が設けられ、
前記第２の管部内には、前記第２の管部の一端部側から他端部側への流体の流通を抑制する第２の逆止弁が設けられ、
前記第２の管部は、その内径が、前記第１の逆止弁の外径よりも大きい、
グラウト材注入用の注入管。
〔請求項２〕
前記第１の逆止弁は、前記第２の管部の他端部側の開口から前記第２の管部内に挿入されて前記第２の管部内を経て前記第１の管部内に設けられる、請求項１に記載のグラウト材注入用の注入管。
〔請求項３〕
前記第１の管部の一端部の開口を塞ぐ閉口部を更に備え、
この閉口部は、前記第１の管部内に前記第１の逆止弁が装着されるに先立って、かつ、前記第２の管部内に前記第２の逆止弁が装着されるに先立って、取り除かれる、請求項１又は請求項２に記載のグラウト材注入用の注入管。
〔請求項４〕
前記第１の管部の他端部側の内周面には、前記第１の逆止弁が螺合するための雌ねじ部が形成されている、請求項１〜請求項３のいずれか１つに記載のグラウト材注入用の注入管。
〔請求項５〕
前記第２の逆止弁には、その外周面と前記第２の管部の内周面との間をシールするシール部材が設けられている、請求項１〜請求項４のいずれか１つに記載のグラウト材注入用の注入管。
〔請求項６〕
前記地下構造物はシールドトンネルの覆工体であり、前記構造部材はセグメントである、請求項１〜請求項５のいずれか１つに記載のグラウト材注入用の注入管を備えて、シールドトンネルの覆工体を構成する、セグメント。
〔請求項７〕
請求項１〜請求項６のいずれか１つに記載のグラウト材注入用の注入管に前記第１の逆止弁及び前記第２の逆止弁が着脱可能に設けられた状態で前記地下構造物内からのグラウト材の注入を行った後に、再び、前記地下構造物内から前記空隙にグラウト材を注入する方法であって、
前記第２の逆止弁を前記第２の管部から離脱して前記第２の管部の他端部側の開口から前記地下構造物内に取り出す第１の工程と、
前記第１の逆止弁を前記第１の管部から離脱して前記第２の管部の他端部側の開口から前記地下構造物内に取り出す第２の工程と、
前記第１の逆止弁を前記地下構造物内から前記第２の管部の他端部側の開口に挿入して前記第１の管部内に装着する第３の工程と、
前記第２の逆止弁を前記地下構造物内から前記第２の管部の他端部側の開口に挿入して前記第２の管部内に装着する第４の工程と、
前記第２の管部の他端部側の開口から前記第２の管部内及び第１の管部内にグラウト材を供給することにより、前記地下構造物内から前記空隙にグラウト材を注入する第５の工程と、
を含む、グラウト材の再注入方法。
〔請求項８〕
前記第３の工程に先立って、前記第１の管部内及び／又は前記第２の管部内に残っているグラウト材を除去する第６の工程を更に含む、請求項７に記載のグラウト材の再注入方法。
〔請求項９〕
請求項１〜請求項６のいずれか１つに記載のグラウト材注入用の注入管に前記第１の逆止弁が設けられ、かつ、前記第２の逆止弁が着脱可能に設けられた状態で前記地下構造物内からのグラウト材の注入を行った後に、再び、前記地下構造物内から前記空隙にグラウト材を注入する方法であって、
前記第２の逆止弁を前記第２の管部から離脱して前記第２の管部の他端部側の開口から前記地下構造物内に取り出す工程と、
前記第２の逆止弁を前記地下構造物内から前記第２の管部の他端部側の開口に挿入して前記第２の管部内に装着する工程と、
前記第２の管部の他端部側の開口から前記第２の管部内及び第１の管部内にグラウト材を供給することにより、前記地下構造物内から前記空隙にグラウト材を注入する工程と、
を含む、グラウト材の再注入方法。
〔請求項１０〕
前記第２の逆止弁を前記第２の管部内に装着する工程に先立って、前記第２の管部内に残っているグラウト材を除去する工程を更に含む、請求項９に記載のグラウト材の再注入方法。
In the first to seventh embodiments described above, the shield tunnel covering body has been described as an example of an underground structure. However, the cross-sectional shape of the covering body is not limited to a circular shape, but an elliptical shape, a rectangular shape, or a rectangular shape. The shape may be any other cross-sectional shape. The underground structure is not limited to a shield tunnel lining body, and may be a caisson, for example. Moreover, although the segment (Segment 1, RC segment 2, steel segment 71, synthetic segment 81) was mentioned and demonstrated as a structural member which comprises an underground structure, a structural member is not restricted to this.
The claims at the beginning of the application were as follows.
[Claim 1]
An injection pipe provided in the structural member in order to inject a grout material from within the underground structure into a gap between the structural member constituting the underground structure and the surrounding natural ground,
A first pipe portion that extends from the one end portion that is located in the natural mountain side portion of the structural member and that opens toward the inside of the underground structure;
A second pipe portion extending from one end connected to the other end of the first pipe toward the inside of the underground structure;
With
A first check valve that suppresses the flow of fluid from one end of the first pipe to the other end is provided in the first pipe.
In the second pipe part, a second check valve for suppressing the flow of fluid from one end side to the other end side of the second pipe part is provided,
The inner diameter of the second pipe part is larger than the outer diameter of the first check valve,
Injection tube for grout injection.
[Claim 2]
The first check valve is inserted into the second pipe part from the opening on the other end side of the second pipe part, and is provided in the first pipe part through the second pipe part. An injection tube for injecting grout material according to claim 1.
[Claim 3]
A closing portion for closing an opening at one end of the first tube portion;
The closing portion is provided before the first check valve is mounted in the first pipe portion and before the second check valve is mounted in the second pipe portion. The infusion tube for injecting grout material according to claim 1 or 2, which is removed.
[Claim 4]
The internal thread part for the said 1st non-return valve to screw together is formed in the internal peripheral surface at the other end part side of a said 1st pipe part, The any one of Claims 1-3. An injection tube for injecting grout material as described in 1.
[Claim 5]
The sealing member which seals between the outer peripheral surface and the internal peripheral surface of the said 2nd pipe part is provided in the said 2nd non-return valve, The any one of Claims 1-4. An injection tube for injecting grout material as described in 1.
[Claim 6]
The said underground structure is a lining body of a shield tunnel, and the said structural member is a segment, It is equipped with the injection pipe for grout material injection | pouring as described in any one of Claims 1-5, A shield tunnel The segments that make up the lining body.
[Claim 7]
The underground structure in a state where the first check valve and the second check valve are detachably provided in the injection pipe for injecting the grout material according to any one of claims 1 to 6. After injecting the grout material from inside the object, again, a method of injecting the grout material from the underground structure into the gap,
A first step of detaching the second check valve from the second pipe portion and taking out the second check valve from the opening on the other end side of the second pipe portion into the underground structure;
A second step of removing the first check valve from the first pipe portion and taking it out from the opening on the other end side of the second pipe portion into the underground structure;
A third step of inserting the first check valve into the opening on the other end side of the second pipe portion from within the underground structure and mounting the first check valve in the first pipe portion;
A fourth step of inserting the second check valve into the opening on the other end side of the second pipe portion from within the underground structure and mounting the second check valve in the second pipe portion;
The grout material is injected into the gap from the underground structure by supplying the grout material into the second tube portion and the first tube portion from the opening on the other end side of the second tube portion. 5 steps,
A method for reinjecting grout material.
[Claim 8]
The grout material according to claim 7, further comprising a sixth step of removing the grout material remaining in the first pipe part and / or the second pipe part prior to the third step. Reinjection method.
[Claim 9]
The injection pipe for injecting grout material according to any one of claims 1 to 6, wherein the first check valve is provided, and the second check valve is detachably provided. After injecting grout material from within the underground structure in a state, again, a method of injecting grout material from the underground structure into the gap,
Removing the second check valve from the second pipe part and taking it out from the opening on the other end side of the second pipe part into the underground structure;
Inserting the second check valve into the opening on the other end side of the second pipe portion from within the underground structure and mounting the second check valve in the second pipe portion;
A step of injecting the grout material into the void from the underground structure by supplying the grout material into the second tube portion and the first tube portion from the opening on the other end side of the second tube portion; When,
A method for reinjecting grout material.
[Claim 10]
The grout material according to claim 9, further comprising a step of removing the grout material remaining in the second pipe portion prior to the step of mounting the second check valve in the second pipe portion. Re-injection method.
１ セグメント
２ ＲＣセグメント
１０ 注入管
１１ 第１の管部
１１ａ 一端部
１１ｂ 他端部
１２ 第２の管部
１２ａ 一端部
１２ｂ 他端部
１３ フランジ部
１４ 雌ねじ部
１４ａ 平滑面
１５ 雌ねじ部
１６ 平滑面
１７、１８ Ｏリング
１９ 補強筋
２０ キャップ
２１ コンクリート
２４ 注入孔
３０ 第１の逆止弁
３１ 弁本体
３１ａ 隔壁
３１ｂ 弁座
３２ 弁体
３２ａ ヒンジ部
３３ 弁座開口
４１ 雄ねじ部
５０ 第２の逆止弁
５１ 弁本体
５１ａ 弁座
５１ｂ 弁座開口
５２ 弁体
５３ コイルばね
５４ Ｏリング
５５ ばね収容部
５５ａ 蓋部
５５ｂ 貫通孔
５６ 取り付け部
５７ 皿ねじ
５８ ナット
６０ プラグ
６１ 雄ねじ部
６２ 平滑面
６２ａ 溝部
７１ 鋼製セグメント
７２ スキンプレート
７２ａ 開口部
８１ 合成セグメント
８２ スキンプレート
８２ａ 開口部
1 segment 2 RC segment 10 injection pipe 11 first pipe part 11a one end part 11b other end part 12 second pipe part 12a one end part 12b other end part 13 flange part 14 female thread part 14a smooth surface 15 female thread part 16 smooth surface 17 , 18 O-ring 19 Reinforcing bar 20 Cap 21 Concrete 24 Injection hole 30 First check valve 31 Valve body 31a Bulkhead 31b Valve seat 32 Valve body 32a Hinge portion 33 Valve seat opening 41 Male thread portion 50 Second check valve 51 Valve body 51a Valve seat 51b Valve seat opening 52 Valve body 53 Coil spring 54 O-ring 55 Spring accommodating portion 55a Cover portion 55b Through hole 56 Mounting portion 57 Countersunk screw 58 Nut 60 Plug 61 Male thread portion 62 Smooth surface 62a Groove portion 71 Steel segment 72 Skin Plate 72a Opening 81 Composite Segment 82 Skin Plate 82a Opening
Claims (7)
前記構造部材の地山側部分に位置して開口する一端部から前記地下構造物の内方に向かって延びる第１の管部と、
前記第１の管部の他端部に連結される一端部から前記地下構造物の内方に向かって延びる第２の管部と、
を備え、
前記第１の管部内には、前記第１の管部の一端部側から他端部側への流体の流通を抑制する第１の逆止弁が設けられ、
前記第２の管部内には、前記第２の管部の一端部側から他端部側への流体の流通を抑制する第２の逆止弁が設けられ、
前記第２の管部は、その内径が、前記第１の逆止弁の外径よりも大きく、
前記第１の逆止弁は、前記第２の管部の他端部側の開口から前記第２の管部内に挿入されて前記第２の管部内を経て前記第１の管部内に設けられる、グラウト材注入用の注入管。 An injection pipe provided in the structural member in order to inject a grout material from within the underground structure into a gap between the structural member constituting the underground structure and the surrounding natural ground,
A first pipe portion that extends from the one end portion that is located in the natural mountain side portion of the structural member and that opens toward the inside of the underground structure;
A second pipe portion extending from one end connected to the other end of the first pipe toward the inside of the underground structure;
With
A first check valve that suppresses the flow of fluid from one end of the first pipe to the other end is provided in the first pipe.
In the second pipe part, a second check valve for suppressing the flow of fluid from one end side to the other end side of the second pipe part is provided,
Said second tube section, an inner diameter, much larger than the outer diameter of said first check valve,
The first check valve is inserted into the second pipe part from the opening on the other end side of the second pipe part, and is provided in the first pipe part through the second pipe part. , Injection tube for grout injection.
前記構造部材の地山側部分に位置して開口する一端部から前記地下構造物の内方に向かって延びる第１の管部と、
前記第１の管部の他端部に連結される一端部から前記地下構造物の内方に向かって延びる第２の管部と、
を備え、
前記第１の管部内には、前記第１の管部の一端部側から他端部側への流体の流通を抑制する第１の逆止弁が設けられ、
前記第２の管部内には、前記第２の管部の一端部側から他端部側への流体の流通を抑制する第２の逆止弁が設けられ、
前記第１の管部の他端部側の内周面には、前記第１の逆止弁が螺合するための雌ねじ部が形成されており、
前記第１の逆止弁が前記第２の管部の他端部側の開口から前記第２の管部内に挿入されて前記第２の管部内を経て前記第１の管部内に設置可能なように、前記第２の管部の内径が前記第１の逆止弁の外径よりも大きい、グラウト材注入用の注入管。 An injection pipe provided in the structural member in order to inject a grout material from within the underground structure into a gap between the structural member constituting the underground structure and the surrounding natural ground,
A first pipe portion that extends from the one end portion that is located in the natural mountain side portion of the structural member and that opens toward the inside of the underground structure;
A second pipe portion extending from one end connected to the other end of the first pipe toward the inside of the underground structure;
With
A first check valve that suppresses the flow of fluid from one end of the first pipe to the other end is provided in the first pipe.
In the second pipe part, a second check valve for suppressing the flow of fluid from one end side to the other end side of the second pipe part is provided,
On the inner peripheral surface on the other end side of the first pipe portion, a female screw portion for screwing the first check valve is formed,
The first check valve can be inserted into the second pipe part from the opening on the other end side of the second pipe part and can be installed in the first pipe part through the second pipe part. as such, the inner diameter of the second tubular portion is larger than the outer diameter before Symbol first check valve, inlet tube for grout injection.
この閉口部は、前記第１の管部内に前記第１の逆止弁が装着されるに先立って、かつ、前記第２の管部内に前記第２の逆止弁が装着されるに先立って、取り除かれる、請求項１〜請求項３のいずれか１つに記載のグラウト材注入用の注入管。 A closing portion for closing an opening at one end of the first tube portion;
The closing portion is provided before the first check valve is mounted in the first pipe portion and before the second check valve is mounted in the second pipe portion. The injection tube for injecting grout material according to any one of claims 1 to 3, which is removed.
前記第２の逆止弁を前記第２の管部から離脱して前記第２の管部の他端部側の開口から前記地下構造物内に取り出す第１の工程と、
前記第１の逆止弁を前記第１の管部から離脱して前記第２の管部の他端部側の開口から前記地下構造物内に取り出す第２の工程と、
前記第１の逆止弁を前記地下構造物内から前記第２の管部の他端部側の開口に挿入して前記第１の管部内に装着する第３の工程と、
前記第２の逆止弁を前記地下構造物内から前記第２の管部の他端部側の開口に挿入して前記第２の管部内に装着する第４の工程と、
前記第２の管部の他端部側の開口から前記第２の管部内及び第１の管部内にグラウト材を供給することにより、前記地下構造物内から前記空隙にグラウト材を注入する第５の工程と、
を含む、グラウト材の再注入方法。 An injection pipe provided in the structural member for injecting a grout material from the underground structure into a gap between the structural member constituting the underground structure and a surrounding natural ground, the structural member A first pipe portion that extends from one end portion that is located on the natural mountain side portion and opens toward the inside of the underground structure, and one end portion that is connected to the other end portion of the first pipe portion, A second pipe portion extending inward of the structure, and the flow of fluid from one end side to the other end side of the first pipe portion is suppressed in the first pipe portion. A first check valve is provided, and a second check valve that suppresses fluid flow from one end side to the other end side of the second pipe portion is provided in the second pipe portion. provided, said second tube portion, an inner diameter, the larger than the outer diameter of the first check valve, said first check valve and the said injection tube A method of injecting the grout material from the underground structure into the gap again after injecting the grout material from the underground structure with the two check valves detachably provided. ,
A first step of detaching the second check valve from the second pipe portion and taking out the second check valve from the opening on the other end side of the second pipe portion into the underground structure;
A second step of removing the first check valve from the first pipe portion and taking it out from the opening on the other end side of the second pipe portion into the underground structure;
A third step of inserting the first check valve into the opening on the other end side of the second pipe portion from within the underground structure and mounting the first check valve in the first pipe portion;
A fourth step of inserting the second check valve into the opening on the other end side of the second pipe portion from within the underground structure and mounting the second check valve in the second pipe portion;
The grout material is injected into the gap from the underground structure by supplying the grout material into the second tube portion and the first tube portion from the opening on the other end side of the second tube portion. 5 steps,
A method for reinjecting grout material.
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