JP6433861B2 - Injection pipe, segment, and grout material reinjection method for grout material injection - Google Patents

Description

  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.

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.

  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).

JP 09-004378 A

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.

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.

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.

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.

  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).

The perspective view and top view which show schematic structure of the segment in 1st Embodiment of this invention Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in the segment in the said 1st Embodiment. Partial enlarged view of part P in FIG. Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in RC segment in 2nd Embodiment of this invention. Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in the steel segment in 3rd Embodiment of this invention. Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in the synthetic | combination segment in 4th Embodiment of this invention. Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in RC segment in 5th Embodiment of this invention. Sectional drawing which shows the state by which the injection hole for grout injection | pouring was drilled in RC segment in the said 5th Embodiment Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in the steel segment in 6th Embodiment of this invention. Sectional drawing which shows schematic structure of the injection pipe for grout material injection | pouring provided in the synthetic | combination segment in 7th Embodiment of this invention.

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.

  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.

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”.

  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.

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.

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.

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.

  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.

  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.

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.

  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.

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.

  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.

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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

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.

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).

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). ).

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.

  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.

  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).

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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).

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.

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.

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.

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.

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.

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.

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.

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.

  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.

  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.

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.

  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.

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.

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.

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.

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.

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.

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.

  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.

  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.

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 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)

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. 2. The grout material injecting part according to claim 1, wherein a female thread part for screwing the first check valve is formed on an inner peripheral surface on the other end side of the first pipe part. Injection tube. 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. 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. The said underground structure is a cover body of a shield tunnel, The said structural member is a segment, The injection pipe for grout material injection | pouring as described in any one of Claims 1-4 is provided, A shield tunnel The segments that make up the lining body. 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. The grout material according to claim 6 , 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.