JP2009293266A - High-function water-stopping check valve in backfilling material injection hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high function water cutoff check valve which is placed in a backfilling material injection hole of an earth/water pressure resistant structure, such as a shield segment, ensures a high water cutoff function, and can be fitted easily in the injection hole. <P>SOLUTION: The high function water cutoff check valve 10 includes a check valve body 11 inserted in the backfilling material injection hole 2 and a ring water cutoff rubber 12 placed between the check valve body 11 and the inner surface of the backfilling material injection hole 2. A male screw 13, which is to be fitted into a female screw 4 of the backfilling material injection hole 2, is formed on the outer peripheral surface of the ring water cutoff rubber 12, while a taper surface 14 widening toward the check valve body 11 is formed on the inner peripheral surface of the water cutoff rubber 12. A taper surface 15 narrowing toward the water cutoff rubber 12 is formed on the outer peripheral surface of the check valve body 11. The taper surface 15 of the check valve body 11 is pushed in to the taper surface 14 of the water cutoff rubber 12. This causes the water cutoff rubber 12 to widen in diameter, which forces the male screw 13 of the water-stopping rubber 12 to firmly stick to the female screw 4 of the injection hole 2 without a gap. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high water check valve for a backfilling material injection hole 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. The backfilling material is roughly classified into two methods: a method using simultaneous injection injected from the shield machine main body and a method using immediate injection injected from an injection hole provided in the segment main body. In the case of the latter immediate injection, since an injection hole penetrating the segment which is the main body structure is provided, it is necessary to secure a high water stop and prevent water leakage into the tunnel.

  Conventionally, a simple check valve (for example, see Patent Document 1) for preventing backflow of backfilling material is installed in the injection hole by two semicircular valve plates made of soft plastic or the like that are opened and closed by a hinge portion. A backfilling material is injected, and after injection, a plug with an O-ring is attached to stop water.

  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.

  In addition, in the water stop structure using the check valve provided in the backfilling material injection hole such as the segment of the shield method, the present applicant has improved the water stop performance of the check valve, facilitated attachment / detachment, and safety. We have already filed a water-stopping structure for the backfilling material injection hole and a refilling method for the backfilling material that can improve the safety of refilling the backfilling material and improve the workability. (Japanese Patent Application No. 2007-170215).

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 simple check valve that opens and closes by the conventional hinge portion described above, the water stoppage is low, and when the plug is attached after the injection is completed, the backfill material leaked from the check valve is the O-ring that is the water stop point. It may get caught between the injection holes and cause water leakage.

  The present invention is intended to solve the above-described problems, and can ensure high water blocking in a check valve provided in a backfilling material injection hole of an anti-earth hydraulic structure such as a shield segment. In addition, an object of the present invention is to provide a high water check valve that can be easily attached to the injection hole.

  Claim 1 of the present invention is a check valve provided inside the backfilling material injection hole embedded in the anti-earth hydraulic structure, and a check valve body inserted into the backfilling material injection hole; The water stop member is arranged between the check valve main body and the inner surface of the backfilling material injection hole, and a male screw that fits into the female screw of the backfilling material injection hole is formed on the outer peripheral surface of the water stop member. And a tapered surface that extends toward the check valve body is formed on the inner peripheral surface of the water stop member, and a tapered surface that narrows toward the water stop member is formed on the outer peripheral surface of the check valve body, By pushing the tapered surface of the check valve body into the tapered surface of the water stop member, the water stop member expands in diameter so that the male screw of the water stop member closely contacts the female screw of the backfilling material injection hole. This is a high water check valve characterized by that.

  The present invention is applied to an anti-earth / water pressure structure such as a tunnel lining segment of a shield method, a propelling pipe of a propulsion method, and a culvert of an open-cut method. For example, as shown in FIGS. A water-stopping member such as a ring-shaped water-stopping rubber is provided on the segment inner surface side of the check valve body that allows injection from the segment inner surface side to the segment outer surface side and prevents reverse flow. By pushing the tapered surface of the check valve body into the tapered surface of the water stop member using a simple pushing means and expanding the water stop member, the male screw of the water stop member is spaced from the female screw of the backfilling material injection hole. In this way, a check valve that adheres closely and has a high water stoppage can be obtained.

  Although various types of check valves can be used for the check valve body, it is preferable to use a compression coil spring type check valve having a high water stoppage as shown in the illustrated example. Further, the outer diameter of the check valve main body is made smaller than the inner diameter of the female screw of the backfilling material injection hole, and the check valve main body is fixed inside the backfilling material injection hole by the male screw of the water stop member. .

  According to a second aspect of the present invention, in the high water check valve according to the first aspect, the check valve main body is provided with a bolt penetrating the center of the water stop member, and an opening is formed at the tip of the bolt. The high pressure check valve is characterized in that a supporting pressure plate is attached with a nut and the water stop member is sandwiched between the check valve main body and the pressure support plate by tightening the nut.

  Various methods are conceivable for the pushing means for the tapered surface, but as shown in FIGS. 1 and 2, pushing means using a bolt, a nut and a bearing plate are preferable. A diameter expansion member is provided on the inner surface of the segment of the check valve body, a tapered surface is formed on the outer peripheral surface of the diameter expansion member, the pressure bearing plate is brought into contact with the water stop rubber, and the nut is tightened to It can be pulled into the water stop member. As shown in FIG. 1, the check valve body and the enlarged member may be assembled by welding or the like, or as shown in FIG. 2, the check valve body and the enlarged member are manufactured by integral molding. May be.

  According to a third aspect of the present invention, in the high water check valve according to the second aspect, a male screw that fits into the female screw of the backfilling material injection hole is formed on the outer peripheral surface of the bearing plate. It is a high stop water check valve.

  As shown in FIG. 3, a male screw is also formed on the outer peripheral surface of the bearing plate, and the reaction plate is secured to the backfilling material injection hole with a screw to ensure a reaction force even when receiving high pressure. Can be further improved.

  In the high water check valve configured as described above, the main body of the check valve is inserted into the backfilling material injection hole, and the waterstop member is screwed into the female screw of the backfilling material injection hole. The taper surface of the water-stopping member is brought into contact with the taper surface, and the water-stopping member is expanded in diameter between the taper surfaces by tightening the nut using a pushing means including a bolt, a nut, a bearing plate, etc. Close the male screw closely to the female screw of the backfilling material injection hole.

  Next, the injection nipple of the injection tube is connected to the female screw on the inlet side of the backfilling material injection hole, and the backfilling material is injected. After the injection is completed, a plug with an O-ring is attached to stop water. The high water stop check valve of the present invention has extremely high water stoppage, and when a plug is attached, the backfill material leaked from the check valve as in the prior art is between the O-ring and the injection hole, which is the water stop point. It is possible to reliably prevent water leakage.

(1) Provide a water stop member on the check valve body, push the taper surface of the check valve body into the taper surface of the water stop member, and expand the diameter of the water stop member. Since the female screw of the filling material injection hole is closely attached to the female screw, there is obtained a check valve having high water stoppage.

(2) Insert the check valve body into the backfilling material injection hole, and fix the check valve to the backfilling material injection hole by closely contacting the male screw of the water stop member to the female screw of the backfilling material injection hole. Therefore, attachment to the backfilling material injection hole can be easily performed, and the construction efficiency can be improved.

(3) A high-stop water check valve can be configured with a relatively simple structure including the check valve body and the water-stop member, thereby reducing costs.

  Hereinafter, the present invention will be described based on the illustrated embodiments. This embodiment is a case where the present invention is applied to a ductile segment of a tunnel lining segment. Needless to say, the present invention can also be applied to RC segments, steel segments, synthetic segments, and the like. Furthermore, the present invention can be applied to an anti-earth hydraulic structure such as a propulsion pipe of a propulsion method and a culvert of an open-cut method.

  FIG. 1 is a sectional view showing a first embodiment of a high water check valve according to the present invention. FIG. 2 is a cross-sectional view showing a second embodiment. FIG. 3 is a cross-sectional view showing a third embodiment. 4 is a perspective view of the high water check valve shown in FIG.

  In the embodiment of FIGS. 1 to 3, a backfilling material injection hole 2 by an integral injection pipe is formed in the cast iron portion on the segment inner surface side (tunnel inner side) of the ductile segment 1, and the segment outer surface side (ground mountain side) A backfilling material injection hole 3 communicating with the injection hole 2 is also formed in the concrete portion. A female screw 4 such as a trapezoidal screw is formed in the backfilling material injection hole 2, and the high water check valve 10 of the present invention is attached inside the backfilling material injection hole 2.

  The high water check valve 10 is disposed between the check valve body 11 inserted into the backfill material injection hole 2 and the inner surface of the check valve body 11 and the backfill material injection hole 2. It is comprised from the ring-shaped water stop rubber 12 as a water stop member. In this embodiment, a water stop rubber 12 is disposed on the segment inner surface side of the check valve main body 11.

  A male screw 13 that fits into the female screw 4 of the backfilling material injection hole 2 is formed on the outer peripheral surface of the water stop rubber 12, and a taper that extends toward the check valve body 11 on the inner peripheral surface of the water stop rubber 12. A surface 14 is formed, a tapered surface 15 that narrows toward the water stop rubber 12 is formed on the outer peripheral surface of the check valve main body 11, and a taper surface of the check valve main body 11 is formed inside the taper surface 14 of the water stop rubber 12. By pressing 15, the water stop rubber 12 is expanded in diameter so that the male screw 13 of the water stop rubber 12 is in close contact with the female screw 4 of the backfilling material injection hole 2 so as to obtain high water stoppage. .

  In this embodiment, the check valve main body 11 uses a check valve of a compression coil spring system with high water stoppage. That is, the check valve main body 11 includes a cylindrical member 20, a disc-shaped valve seat 21, a valve body 22, a compression coil spring 23, and a spring receiving member 24. A valve seat opening 25 is formed at the center of the valve seat 21, and a valve body 22 pressed by a compression coil spring 23 closes the valve seat opening 25. The spring receiving member 24 has, for example, a cross shape in plan, and four backfilling material discharge openings 26 are formed.

  Normally, the valve element 22 is pressed against the valve seat 21 by the pressing force of the compression coil spring 23 to close the valve seat opening 25. When the backfill material is injected, the compression coil spring 23 is compressed by the injection pressure of the backfill material, and the valve body 22 is separated from the valve seat 21 to open the valve seat opening 25. After the injection, the valve element 22 is reliably brought into contact with the valve seat 21 by the extension force (restoring force) of the compression coil spring 23 and the valve seat opening 25 is reliably closed, and the backflow of the backfill material is reliably prevented.

  A ring-shaped water stop rubber expanding member 30 is provided on the water stop rubber 12 side of the check valve body 11, a tapered surface 15 is formed on the outer peripheral surface thereof, and a bolt 31, a nut 32, and a bearing plate 33 are used. Thus, the diameter of the water stop rubber 12 is increased. A bolt receiving member 34 having a cruciform planar shape is provided inside the water stop rubber diameter increasing member 30, and a base portion of the bolt 31 is attached to the center thereof, and the bolt 31 penetrates the center of the water stop rubber 12 and the segment inner surface side. Project to Four back-filling material passage openings 35 are formed by the cross-shaped bolt receiving member 34.

  The pressure bearing plate 33 includes a ring-shaped contact plate 33a that contacts the end surface of the ring-shaped waterstop rubber 12, and a rib member 33b having a cross-shaped planar shape, and is formed by a bolt insertion hole at the center of the rib member 33b. Attached to the tip of the bolt 31. Further, four backfilling material passage openings 33c are formed by the cross-shaped rib member 33b. By tightening the nut 32 attached to the tip of the bolt 31, the water stop rubber 12 is sandwiched between the water stop rubber expanding member 30 and the pressure bearing plate 33, and the tapered surface 15 of the water stop rubber expanding member 30 is attached to the water stop rubber 12. It can be pushed into the tapered surface 14.

  In the embodiment of FIG. 1, the check valve main body 11 and the water stop rubber expanding member 30 are separated, and a bolt receiving member 34 is attached to the tip of the cylindrical member 20 by welding or the like. 2 and 4, the number of parts is reduced as much as possible by integral molding. That is, the valve seat 21, the water stop rubber diameter-expanding member 30, the bolt receiving member 34, and the bolt 31 are integrally formed on the cylindrical member 20. As shown in FIGS. 2 and 4, the locking member 36 having the locking groove 36 a is provided at the tip of the cylindrical member 20, and the tip of the cross-shaped spring receiving member 24 is engaged. The spring receiving member 24 can be easily attached by slidingly inserting the retaining groove 36a from the lateral direction.

  In the embodiment of FIG. 3, a male screw 40 that fits into the female screw 4 of the backfilling material injection hole 2 is formed on the outer peripheral surface of the bearing plate 33 so that a reaction force can be secured by the bearing plate 33 when receiving a high pressure. This is an example. A thick disk is used as the bearing plate 33, and four backfilling material passage openings 33c are provided inside. Although FIG. 3 is applied to FIG. 2, it can be applied to FIG.

  The check valve main body 11, the water stop rubber expanding member 30, the bolt 31, the nut 32, and the bearing plate 33 can be made of steel, reinforced plastic, ceramic, or the like. The compression coil spring 23 may use other elastic members such as a leaf spring and a disc spring, and the material thereof may be steel, reinforced plastic, or the like. The valve body 22 can be made of steel, reinforced plastic, ceramic, rubber or the like.

  1 to 3, the outer diameter of the check valve body 11 having the water stop rubber expanding member 30 is smaller than the inner diameter of the female screw 4 of the backfilling material injection hole 2, and the backfilling material injection hole from the segment inner surface side. 2 can be inserted. Next, the water stop rubber 12 is screwed into the female screw 4 of the backfilling material injection hole 2, and the taper surface 14 of the water stop rubber 12 is brought into contact with the taper surface 15 of the water stop rubber expanding member 30. Next, the bearing plate 33 and the nut 32 are attached to the bolt 31, the bearing plate 33 is brought into contact with the water stop rubber 12, and the nut 32 is tightened to expand the diameter of the water stop rubber 12 with the tapered surfaces 14 and 15. The male screw 13 of the rubber 12 is brought into close contact with the female screw 4 of the backfilling material injection hole 2 without a gap. In the case of FIG. 3, the only difference is that the bearing plate 33 is screwed in, and the others are the same.

  An injection nipple of an injection tube is connected to the female screw 4 on the inlet side of the backfilling material injection hole 2 to inject the backfilling material. The backfill material passes through the high water check valve 10 and fills the gap between the ground and the segment ring. After the injection is completed, attach a plug with an O-ring to stop water. The high water stop check valve of the present invention has extremely high water stoppage, and when a plug is attached, the backfill material leaked from the check valve as in the prior art is between the O-ring and the injection hole, which is the water stop point. It is possible to reliably prevent water leakage.

  Needless to say, the present invention is not limited to the illustrated examples. For example, various modes are conceivable in which the tapered surfaces 14 and 15 are tapered screws, and the water stop rubber 12 is expanded by screwing the check valve body 11.

It is sectional drawing which shows 1st Embodiment of the high water check valve of this invention, and a top view of a member. It is sectional drawing which shows 2nd Embodiment of the high water check valve of this invention, and the top view of a member. It is sectional drawing which shows 3rd Embodiment of the high water check valve of this invention, and the top view of a member. It is a perspective view of the high water check valve of FIG.

Explanation of symbols

1 ... Ductile segment 2 ... Backfill material injection hole (inside tunnel)
3. Backfilling material injection hole (natural ground side)
4 ... Female thread 10 ... High water stop check valve 11 ... Check valve body 12 ... Water stop rubber (water stop member)
13 ... Male thread 14 of still water rubber ... Tapered surface 15 of still water rubber ... Tapered surface 20 of check valve body ... Cylindrical member 21 ... Valve seat 22 ... Valve body 23 ... Compression coil spring 24 ... Spring receiving member 25 ... Valve seat Opening 26 ... Backfilling material discharge opening 30 ... Water stop rubber expanding member 31 ... Bolt 32 ... Nut 33 ... Supporting plate 33a ... Contact plate 33b ... Rib member 33c ... Backfilling material passage opening 34 ... Bolt receiving member 35 ... Back Filling material passage opening 36 ... locking member 36a ... locking groove 40 ... male screw

Claims (3)

It is a check valve provided inside the backfilling material injection hole embedded in the anti-earth hydraulic structure,
The check valve body is inserted into the backfill material injection hole, and the water stop member is disposed between the check valve body and the inner surface of the backfill material injection hole. A male thread that fits into the female thread of the backfilling material injection hole is formed on the surface, and a tapered surface that extends toward the check valve body is formed on the inner peripheral surface of the water stop member. A tapered surface that narrows toward the water stop member is formed on the outer peripheral surface, and the water stop member expands by pushing the taper surface of the check valve body into the taper surface of the water stop member. A high water check valve, characterized in that is configured to be in close contact with the female screw of the backfilling material injection hole.   2. The high water check valve according to claim 1, wherein a bolt passing through the center of the water stop member is provided in the check valve main body, and a bearing plate having an opening at the tip of the bolt is attached by a nut. A high water check valve, wherein the water stop member is sandwiched between the check valve main body and the pressure bearing plate by tightening a nut.   3. The high water check valve according to claim 2, wherein a male screw that fits into the female screw of the backfilling material injection hole is formed on the outer peripheral surface of the bearing plate.

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