JP2009007830A - Water stop structure for back-fill material filling hole and back-fill material refilling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cut off structure using check valves for a back-fill filling hole of a soil resistant hydraulic structure such as a sealed segment, having improved working safety and workability during refilling of a back-fill material while improving the cut off performance of the check valve, allowing easy mounting/demounting thereof and improving the safety thereof, and to provide a back-fill material refilling method. <P>SOLUTION: On the inside back-fill material filling side (the natural ground side) of a filling pipe 2, the simple check valve 20 is provided which is normally closed and opened with the filling pressure of the back-fill material. On the back-fill material filling side (the tunnel inside), the high-water cut off check valve 10 using a compression spring 13 is easily and detachably mounted via a snap ring 14, which is normally closed and opened with the filling pressure of the back-fill material. Such double cut off improves cut off performance and safety, resulting in improved working safety and workability during refilling the back-fill material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water stop structure for a backfilling material injection hole and a refilling method for the backfilling material applied to an anti-earth hydraulic structure such as a tunnel lining segment.

  A tunnel lining segment will be described as an example in a shield lining segment for tunnel lining, a propelling method propelling pipe, and an anti-earth hydraulic structure such as an open-cut culvert.

  In the shield method used for construction of tunnels, in order to stabilize the natural ground, construction is performed while filling the gap between the natural ground and the segment ring, which is caused by the excavation of the shield machine, with a backfill material. When the backfill material is filled from the inside of the tunnel using the backfill material injection hole attached to the segment, a check valve is screwed into the screw portion of the injection pipe constituting the backfill material injection hole, Prevents inflow of backfill materials and groundwater into the tunnel.

  Also, instead of filling the backfill material from the inside of the tunnel using the backfill material injection hole attached to the segment, the backfill material is discharged from the backfill material injection pipe attached to the shield machine in advance. A method called simultaneous injection for filling the backfill material is also often used. In this case, when the backfilling material in the backfilling material injection tube is solidified and the inside of the tube is blocked, the backfilling material injection amount is insufficient, sometimes injecting is impossible, and ground subsidence may be induced. . For this reason, a backfilling material injection hole is attached to some segments, and an unexpected situation may be dealt with so that the backfilling material can be supplementally injected from the backfilling material injection hole.

  Furthermore, after the primary injection by any of the above methods, for example, when building a station part by opening the tunnels provided in the subway tunnel, displacement and deformation occur in the segment ring in the construction process, Reinfusion may be required to prevent disturbance of the surrounding ground and land subsidence. In addition, in a gravel layer with a small amount of fine particles, the injected backfill material may be reinjected if it is lost to the void in the gravel layer or diluted with flowing groundwater.

  The conventional check valve attached to the backfilling material injection hole uses a semi-circular valve plate made of soft plastic or the like that opens and closes by a hinge part in the cylindrical body to prevent backflowing of the backfilling material. (For example, refer to Patent Document 1).

In Patent Documents 2 to 5, the valve body is pressed against the valve seat by the pressing force of the spring, and the valve body is opened apart from the valve seat against the pressing force of the spring by the injection pressure of the backfill material. A structured check valve is described.
JP-A-3-287998 Japanese Utility Model Publication No. 61-135993 Japanese Utility Model Publication No. 63-23394 Utility Model Registration No. 3007863 JP 07-158388 A

  In the case of the check valve that opens and closes by the above-described conventional hinge portion, the water stoppage is low, and water may leak from the screw fitting portion that is screwed to the valve portion or the injection pipe.

  If reinjection is necessary as described above, it is necessary to remove the check valve once, remove the hardened backfill material in the injection tube, and then attach the check valve again to inject. When removing the stop valve and cleaning the injection pipe, it is necessary to be careful not to allow groundwater to flow into the tunnel. However, with the conventional stop structure, a simple check valve is used. Therefore, it was not possible to deal with it sufficiently.

  The present invention is intended to solve the above-described problems, and in a water stop structure using a check valve provided in a backfilling material injection hole such as a segment of a shield method, the water stoppage of the check valve Water-retaining structure of the backfilling material injection hole that can improve the safety, ease of attachment / detachment, improve safety, and improve the safety and workability of the refilling operation of the backfilling material And it aims at providing the reinjection method of backfilling material.

  The water stop structure according to claim 1 of the present invention is a water stop structure using a check valve provided inside a backfilling material injection hole embedded in an anti-earth hydraulic structure, and is provided inside a valve body. The valve body is pressed against the valve seat by the pressing force of the spring to close the valve seat opening, and the valve body is separated from the valve seat against the spring pressing force by the injection pressure of the backfilling material to open the valve seat opening. The high water check valve configured to open and the valve body of the high water check valve are arranged so as to be sandwiched from both sides in the injection direction of the backfill material, and are formed on the inner surface of the backfill material injection hole. It is characterized by comprising a retaining ring detachably attaching the high water check valve to the inside of the backfilling material injection hole by mounting it in the groove.

  As illustrated in FIGS. 1 to 10, the present invention is a water stop structure using a check valve provided in a backfilling material injection hole of a segment ring of a shield method, and reverse using a compression coil spring or the like. The stop valve improves the water-stopping property, and uses a retaining ring to facilitate attachment / detachment from the injection tube constituting the backfilling material injection hole.

  A ring-shaped retaining ring that can be partly divided and elastically deformed is attached to a groove processed at a predetermined location inside the injection pipe, and a high-water check valve is sandwiched between the pair of retaining rings to firmly Fix it. A seal ring such as an O-ring is disposed in the gap between the valve body of the high water check valve and the inner surface of the injection pipe to prevent water leakage from the gap. Normally, the valve body is pressed against the valve seat by the pressing force of the spring, the valve seat opening is closed, and when the backfill material is injected, the spring is compressed by the injection pressure of the backfill material, and the valve body is separated from the valve seat. After the seat opening is opened and injected, the valve element reliably contacts the valve seat by the extension force (restoring force) of the spring and the valve seat opening is reliably closed, so that back flow of the backfill material is reliably prevented. The retaining ring can be easily attached and detached from the inner space side of the segment.

  The water stop structure according to claim 2 of the present invention is a water stop structure using a check valve provided inside the back filling material injection hole embedded in the anti-earth hydraulic structure, The first check valve that is normally closed and opened by the injection pressure of the backfilling material is provided on the backfilling material filling side (ground side), and the backfilling material injection side (segment) inside the backfilling material injection hole The double waterstop structure is characterized in that a second check valve is detachably provided on the ring inner space side) that is normally closed and opened by the injection pressure of the backfill material.

  As shown in FIGS. 1 to 10, the back-filling material injection hole of the segment is double-stopped by a check valve to improve water-stopping and safety, and to re-fill the back-filling material. It is intended to improve the safety of the injection work and the workability. As shown in FIGS. 1 to 4, two check valves are provided in the injection pipe penetrating the segment, or as shown in FIGS. 5 and 6, an injection pipe or an injection pipe attached to the segment body with screws, and As shown in FIG. 9 and FIG. 10, it is provided in the main body injection hole, or is attached so as to communicate with the suspension metal fitting by using the suspension fitting of the erector as the segment assembly device as a part of the injection hole. Provide in the injection tube.

  The first check valve uses a simple check valve whose valve body is opened and closed by a hinge portion (Claim 3), and the second check valve is a high water check valve that is closed by the pressing force of the spring. Preferably, the high water check valve is detachably fixed by a retaining ring.

  The double check valve can improve water stop and improve safety. If it is necessary to re-inject after filling of the backfill material, remove the plug that closes the injection pipe or the suspension bracket and remove the plug until the second check valve (high water check valve). The backfill material is removed, the retaining ring on the injection side of the second check valve is removed, and the second check valve is removed using the hook 11d. The second check valve can be easily removed simply by removing the retaining ring. Next, if necessary, the backfill material up to the first check valve (simple check valve) is removed. At this time, since the first check valve is on the natural ground side, the backfill material and groundwater Does not flow back in large amounts, and can be cleaned safely and easily.

  The backfilling material reinjection method according to claim 5 of the present invention is after the backfilling material injection is completed using the double water blocking structure according to any one of claims 2 to 4. When refilling the backfill material, after removing the backfill material from the inner surface of the segment to the second check valve inside the backfill material injection hole, the second check valve is removed, if necessary, After removing the backfill material up to the first check valve, a second check valve is attached, and the backfill material is reinjected through the second check valve and the first check valve.

  The backfill material may or may not be removed until just before the first check valve. That is, depending on the expression strength of the backfill material, reinjection is possible without removal, and in this case, it is only necessary to remove the second check valve. The second check valve is attached after cleaning.

  As illustrated in FIG. 11, even if a gap or the like is generated between the ground and the backfill material after the backfilling material injection is completed, the backfilling material can be safely refilled by the double water stop structure. And it can be performed with good workability.

(1) In the water stop structure using a check valve provided in the backfilling material injection hole of the segment of the shield method, the water stop is improved by the check valve using a compression coil spring, etc. It becomes easy to attach and detach from the injection tube constituting the injection hole.
(2) Water stoppage and safety are improved by double-stopping the backfilling material injection hole with a check valve.
(3) By stopping water twice, it is possible to improve the safety and workability of the refilling operation of the backfill material.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a cross-sectional view showing an embodiment of a double water blocking structure for a concrete segment of the present invention. 2 is a cross-sectional view showing one embodiment of a double water-stop structure for a steel segment, FIG. 3 is a cross-section view for a composite segment, and FIGS. 4 to 6 are various embodiments of a double water-stop structure for a ductile segment. FIG. FIG. 7 is a sectional view showing an example of a high water check valve used in the present invention, a plan view of parts, and the like. FIG. 8 is a perspective view showing the double waterstop structure of FIG. 1 in cross section. 9 is a cross-sectional view showing another example of the double water blocking structure of FIG. 1 of the present invention. FIG. 10 is a perspective view showing the double waterstop structure of FIG. 9 in cross section. FIG. 11 is a cross-sectional view showing an example of the reinjection method of the present invention in the order of steps.

  The embodiment of FIG. 1 is an example in which a backfilling material injection hole is formed by burying an injection pipe 2 penetrating from an inner surface on the tunnel inner side of a segment 1 of a precast concrete member to an outer surface on a natural ground side. A high water check valve 10 is disposed on the inner surface side of the segment (inner side of the tunnel), and a conventional simple check valve 20 is disposed on the outer surface side of the segment (natural ground side). Can be attached and detached from the inside of the tunnel, the double water-stop structure improves water-stopping and safety, and improves safety and workability during re-injection.

  In the steel segment 1 of FIG. 2 and the synthetic segment of FIG. 3, the end of the injection tube 2 is attached to the skin plate 1a by welding. In the ductile segment 1 shown in FIGS. 4 to 6, in the example shown in FIG. 4, the injection tube 2 is formed integrally with the segment body. In the example of FIG. 5, the injection tube 2 is attached to the injection hole of the segment body with a screw. In the example of FIG. 6, the simple water stop valve 20 is attached to the injection hole of the segment body with a screw, and the injection pipe 2 provided with only the high water check valve 10 is attached with a screw.

  As shown in FIGS. 1 to 7, the high water check valve 10 mainly includes a valve body 11, a valve body 12, and a compression coil spring 13, and is inserted into an intermediate position inside the injection pipe 2. The upper and lower parts are fixed by a pair of retaining rings 14 so as to be attachable / detachable.

  The valve body 11 includes a cylindrical member 11a, a disc-shaped valve seat 11b, a spring mounting member 11c, and a hook 11d, and a valve body 12 and a compression coil spring 13 are accommodated therein. A valve seat opening 15 is formed at the center of the valve seat 11 b, and the valve body 12 pressed by the compression coil spring 13 closes the valve seat opening 15. As shown in FIG. 7D, the valve body 12 has a convex portion inserted into the valve seat opening 15 at the center of the lower surface, and a seal ring 12a made of rubber or the like is provided around the convex portion to provide a water stop. You may make it raise. Further, as shown in FIG. 7 (e), a seal ring 12a such as rubber may be attached to the valve seat 11b so as to increase the water stoppage.

  As shown in FIG. 7C, the spring mounting member 11c has a cross shape, for example, and has four back-filling material discharge openings 16 formed therein. The compression coil spring 13 of the spring mounting member 11c and the valve body 12 is arranged in a compressed state. At this time, the spring mounting member 11c and the compression coil spring 13 may be fixed with their center axes aligned, but as shown in FIG. The guide coil 11e (for example, a flat washer) may be used as a guide, and the compression coil spring 13 may be mounted on the outside thereof.

  Normally, the valve body 12 is pressed against the valve seat 11b by the pressing force of the compression coil spring 13, and the valve seat opening 15 is closed. When the backfill material is injected, the compression coil spring 13 is compressed by the injection pressure of the backfill material, and the valve body 12 is separated from the valve seat 11b to open the valve seat opening 15. After the injection, the valve body 12 is reliably brought into contact with the valve seat 11b by the extension force (restoring force) of the compression coil spring 13 and the valve seat opening 15 is reliably closed, and the backflow of the backfill material is reliably prevented.

  The retaining ring 14 is disposed so as to sandwich the valve body 11 from both the upper and lower sides, and is attached to a pair of upper and lower grooves 17 formed on the inner surface of the injection tube 2 at intervals in the vertical direction. The retaining ring 14 is a ring-shaped plate member that is partly made of spring steel and can be elastically deformed. The retaining ring 14 can be easily attached to the groove portion 17 by being deformed in a reduced diameter, and can be easily removed from the groove portion 17. be able to. In the mounted state, the outer portion of the retaining ring 14 is fitted into the groove portion 17, the inner portion of the retaining ring 14 locks the valve seat 11 b and the spring mounting member 11 c, and the valve body 12 is moved by the pair of upper and lower retaining rings 14. It is firmly fixed in the clamped state.

  Since the outer diameter of the valve seat 11b and the spring mounting member 11c is smaller than the inner diameter of the injection pipe 2, in order to prevent water leakage from the gap with the retaining ring 14, the cylindrical member 11a having a smaller outer diameter and the injection pipe 2 A seal ring 18 such as an O-ring is disposed therebetween.

  The valve body 11 of the high water check valve 10 can be made of steel, reinforced plastic, ceramic, or the like. The compression coil spring 13 may use another elastic member such as a plate spring or a disc spring, and the material thereof may be steel, reinforced plastic, or the like. The valve body 12 can be made of steel, reinforced plastic, ceramic, rubber or the like.

  The conventional simple check valve 20 is mainly composed of a cylindrical valve body 21 and a pair of left and right semicircular valve bodies 22, and the valve body 22 is located at the center of the body via a hinge portion 22 a that can be elastically deformed. By attaching to the partition wall 22b, the valve body 22 is a flapper valve that cantilever swings. A semicircular ring-shaped valve seat 22c is provided on the inner surface of the valve body 21, and the valve body 22 is pressed against the valve seat 22c to close the valve seat opening 23.

  Normally, the valve body 22 is pressed against the valve seat 22c due to the flat plate shape of the valve body 22, and the valve seat opening 23 is closed. When the backfill material is injected, the hinge 22a is elastically deformed by the injection pressure of the backfill material, and the valve body 22 tilts upward to open the valve seat opening 23. After the injection, the valve element 22 comes into contact with the valve seat 22c by the restoring force of the hinge 22a and closes the valve seat opening 23, thereby preventing back flow of the backfill material.

  A female thread 2a is formed on the outer surface side of the segment inside the injection pipe 2, and a simple check valve 20 is formed on the outer surface of the valve body 21 by forming a male thread 24 that engages with the female thread 2a. It can be attached by screwing in from the segment outer surface side. An internal thread 2b into which an injection nipple or plug of backfill material is screwed is formed on the inner surface side of the segment inside the injection tube 2.

  The embodiment of FIGS. 9 and 10 is an example when applied to a segment provided with an erector hole by a lifting bracket for lifting by an erector, which is an assembly apparatus for a shield tunnel segment. A hanging metal fitting 30 is embedded on the inner side.

  An erector hole is formed inside the hanging metal fitting 30, and an internal thread 31 into which an erector lifting bolt is screwed is formed on the inner surface of the erector hole. By forming the injection opening 33 inside, the hanging metal fitting 30 is also used as a part of the injection pipe.

  The injection pipe 2 similar to that in the embodiment of FIG. 1 is inserted and attached to the injection opening 32, and the suspension fitting 30 and the injection pipe 2 constitute an injection hole for a backfill material. A high water check valve 10 and a simple check valve 20 are arranged in the injection pipe 2. Since these structures are the same as those of the embodiment of FIG. The female thread 31 of the hanging metal fitting 30 is used for attaching an injection nipple or plug for backfill material.

  In the double waterstop structure as described above, the backfilling material is reinjected by the following procedure (see FIG. 11). In addition, the double water stop structure of FIG. 11 is a case of embodiment of FIG. 9, FIG. The same applies to the embodiment of FIGS.

  (1) The resin plug 40 is attached to the injection side of the hanging metal fitting 30 in a state where the injection of the backfilling material is completed. The backfill material B is also filled between the natural ground A and the segment 1 and inside the hanging metal fitting 30 and the injection pipe 2.

  (2) If a void C is generated between the natural ground A and the backfill material B, reinjection is required.

  (3) Remove the resin plug 40 and remove the backfill material B up to the high water check valve 10. The retaining ring 14 on the injection side of the high pressure stop valve 10 is removed.

  (4) Remove the high water check valve 10. The high water check valve 10 can be easily removed by removing the retaining ring 14 using the hook 11d. Remove the remaining retaining ring 14. The backfill material B up to the simple check valve 10 is removed. Even if the high water check valve 10 is removed, there is a simple check valve 20 on the natural ground side, so that backfilling materials and groundwater will not flow back in large quantities, and cleaning should be performed safely and easily. Can do. In FIG. 11 (iv), the backfilling material is removed immediately before the simple check valve 20, but depending on the strength of the backfilling material, the high water check valve 10 need only be removed.

  (5) Mount the retaining ring 14 on the natural ground side, the high water check valve 10 and the retaining ring 14 on the injection side in this order. The injection nipple 51 of the injection pipe 50 is connected to the hanging bracket 30. Infusion tube 50 is connected to an infusion pump.

  (6) Refill backfill material B. The backfill material B is filled through the high water check valve 10 and the simple check valve 20, and the gap C is eliminated.

  (7) When reinjection is completed, the injection nipple 51 is removed.

  (8) The resin plug 40 is attached to the hanging bracket 30, and the reinjection is completed.

  Needless to say, the present invention is not limited to the illustrated examples. Further, the present invention can be applied not only to the shield method segment but also to the backfilling material injection holes of other anti-earth hydraulic structures.

It is sectional drawing which shows one Embodiment of the double water stop structure to the concrete segment of this invention. It is sectional drawing which shows one Embodiment of the double water stop structure to the steel segments of this invention. It is sectional drawing which shows one Embodiment of the double water stop structure to the synthetic segment of this invention. It is sectional drawing which shows embodiment (Example 1) of the double water stop structure to the ductile segment of this invention. It is sectional drawing which shows embodiment (Example 2) of the double water stop structure to the ductile segment of this invention. It is sectional drawing which shows embodiment (Example 3) of the double water stop structure to the ductile segment of this invention. It is an example of the high water check valve used by this invention, (a) is sectional drawing of the whole, (b) is a top view of a retaining ring, (c) is a top view of a spring attachment member, (d) is a valve It is the side view and back view which show the other example of a body. It is a perspective view which shows the double water stop structure of FIG. 1 in a cross section. It is sectional drawing which shows the other example of the double water stop structure of FIG. 1 of this invention. FIG. 10 is a perspective view showing the double waterstop structure of FIG. 9 in cross section. It is sectional drawing which shows an example of the reinjection method of this invention to process order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Segment ring 1a ... Skin plate 2 ... Injection pipe 2a ... Female thread (natural ground side)
2b ... Female thread (inside the tunnel)
DESCRIPTION OF SYMBOLS 10 ... High stop water check valve 11 ... Valve body 11a ... Cylindrical member 11b ... Valve seat 11c ... Spring mounting member 11d ... Hook 11e ... Guide 12 ... Valve body 12a ... Seal ring 13 of rubber etc .... Compression coil spring 14 ... Stop Ring 15 ... Valve seat opening 16 ... Backfill material discharge opening 17 ... Groove portion 18 ... Seal ring 20 such as O-ring ... Simple check valve 21 ... Valve body 22 ... Valve body 22a ... Hinge portion 22b ... Bulkhead 22c ... Valve seat 23 ... Valve seat opening 24 ... Female screw 30 ... Suspension fitting 31 ... Female screw 32 ... Flange 33 ... Injection opening 40 ... Resin plug 50 ... Injection pipe 51 ... Injection nipple A ... Ground mountain B ... Backfill material C ... Air gap

Claims (5)

It is a water stop structure using a check valve provided inside the backfilling material injection hole embedded in the anti-earth water pressure structure,
The valve body provided inside the valve body is pressed against the valve seat by the pressing force of the spring to close the valve seat opening, and the valve body is separated from the valve seat against the pressing force of the spring by the injection pressure of the backfill material. The high water check valve configured to open the valve seat opening and the valve body of the high water check valve are arranged so as to be sandwiched from both sides in the injection direction of the back filling material. A water stop structure comprising a retaining ring that attaches a high water stop check valve to the inside of a backfilling material injection hole in a detachable manner by being mounted in a groove formed on the inner surface of the hole. It is a water stop structure using a check valve provided inside the backfilling material injection hole embedded in the anti-earth water pressure structure,
The first check valve that is normally closed and opened by the injection pressure of the backfilling material is provided on the backfilling material filling side inside the backfilling material injection hole, and the backfilling material injection side inside the backfilling material injection hole In addition, a double water stop structure characterized in that a second check valve that is normally closed and opened by the injection pressure of the backfill material is detachable.   The double water stop structure according to claim 2, wherein the first check valve is a simple check valve whose valve body is opened and closed by a hinge portion.   The double water stop structure according to claim 2 or 3, wherein the second check valve is a high water check valve that is closed by a pressing force of a spring. Construction.   The inside of the backfilling material injection hole when refilling the backfilling material after the backfilling material filling is completed using the double waterstop structure according to any one of claims 2 to 4. After removing the backfill material from the inner surface of the segment to the second check valve, the second check valve is removed, and if necessary, the backfill material to the first check valve is removed, and then the second check valve is removed. A back-filling material reinjection method comprising attaching a stop valve and re-injecting the back-filling material via the second check valve and the first check valve.

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