JP3515175B2 - Mortar injection check valve in tunnel segment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for mortar injection in tunnel construction by a shield construction method.

[0002]

2. Description of the Related Art Conventionally, in tunnel construction by a shield construction method, as shown in FIGS. 6 and 7, while excavating a lateral hole (5), a segment (4) is assembled into a cylindrical shape in the hole (5). The mortar M is filled in the gap (51) formed between the lateral hole (5) and the segment (4) to stabilize the ground. Mortar M
The filling procedure of is to the hole (41) opened in the segment (4),
The mortar injection pipe (3) is fitted, and the check valve (2) is screwed into the injection pipe (3) and left in place. The mortar injection hose (61) is connected to the injection pipe (3), the mortar M is made to flow from the hose (61), and the mortar M is filled into the surrounding void (51) through the check valve (2). is there. After filling the mortar, remove the hose (61) from the injection pipe (3), and insert the end plug into the injection pipe (3).
(6) is screwed together to prevent backflow of the mortar M.

[0003]

However, as shown in FIGS. 7 and 8, in the injection work of the mortar M,
After the check valve (2) is screwed into the mortar injection pipe (3), until the mortar M is injected, the injection pipe (3) has an end plug.
(6) is not screwed, and is provided between the contact surface (33) of the check valve (2) and the injection pipe (3) and between the valve plate (23) and the valve seat (25) of the check valve (2). ) May leak groundwater. Especially when the tunnel construction site is under high pressure, on the seabed, or for injection pipes.
Portion (3) is provided near the ceiling of the tunnel hole (5)
For example (35 in FIG. 6), the outflow amount of water also increases. The object of the present invention is to provide a clearance between the contact surface (33) of the check valve (2) and the injection pipe (3) and between the valve plate (23) and the valve seat (25) of the check valve (2) ( This will clarify the check valve that prevents the leakage of groundwater from 26).

[0004]

In order to achieve the above object, a check valve according to the present invention comprises a cylindrical seal member (1) made of an elastic member at a distal end of a cylindrical valve casing (22) in a screwing direction. ). or,
Adhesive (81) having weak adhesive force is permeated into the gap between the valve plate (23) and the valve seat (25) of the check valve (2) to bond the valve plate (23) and the valve seat (25) .
It

[0005]

[Action and effect] Mortar injection pipe of segment (4)
When the check valve (2) is screwed into (3), the valve housing (2
The outer surface (11) of the sealing material (1) provided at the tip of (2) comes into close contact with the inner surface (32) of the injection pipe (3) in a pressed state. As a result,
The inflow of groundwater to the contact surface (33) between the injection pipe (3) and the check valve (2) is blocked.

When the water pressure of groundwater is high, the sealing material (1) is further pressed by receiving the water pressure, and the sealing material (1) comes into close contact with the injection pipe (3) and the valve casing (22). Therefore, the injection tube
Leakage of groundwater from the contact surface (33) between (3) and the valve housing (22) is prevented. Further, the gap between the valve plate (23) and the valve seat (25) should be glued (8
By adhering at 1) , the gap (26) formed between the valve plate (23) and the valve seat (25) is closed, and leakage of groundwater from the gap (26) is prevented. The adhesive (81) does not interfere with the mortar injection because it is peeled or broken by the mortar injection pressure during the mortar injection.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. As in the conventional case, as shown in FIG. 6, the tunnel segment (4) used in the tunnel construction by the shield construction method is a combination of a plurality of tunnel segments (5) excavated by a tunnel excavator. Configure a pressure resistant cylinder. The mortar M is poured into the void (51) formed between the side wall of the excavation hole (5) and the cylinder formed by the segment (4), and the mortar M is solidified to form a tunnel.

The segment (4) is a plate surface (43) made of steel or concrete having a thickness of 200 to 700 mm and curved in an arc shape. The segment (4) is fixed to the outer peripheral surface with a bolt nut or the like. A fixing hole for connecting is provided. A hole (41) is formed in the plate surface (43).
Fit the mortar injection pipe (3) into (41). segment
Mortar injection tube (3) if (4) is made of steel
Is welded to the segment (4) and, if the segment (4) is made of concrete, the concrete is poured and hardened after the mortar injection pipe (3) is provided.

As shown in FIG. 2, a mortar injection pipe (3)
Is a cylinder and fits into a hole (41) opened in the segment (4). Inside the mortar injection tube (3), the thread groove (3
1) is cut, and the check valve (2) is screwed into the thread groove (31). Also, after injecting mortar M, mortar injection tube
The end plug (6) is screwed onto the inner end of (3) and sealed so that the mortar M and groundwater do not leak into the tunnel.

As shown in FIGS. 1 to 3, the check valve (2) is
It is a known check valve for mortar, and is a cylindrical valve casing (22) made of synthetic resin having a thread (21) formed on the outer peripheral surface, and a segment (4) at one end inside the valve casing (22). ) A pair of valve plates (23) swingable only toward the outside of () are attached by screws (24). A tubular seal material (1) is fitted to the tip of the check valve (2) facing the outside of the segment. Hereinafter, the "outward direction of the tunnel" means the direction in which the check valve (2) is screwed into the injection pipe (3), and the "inward direction of the tunnel".
Means inside the tunnel.

As shown in FIGS. 1 to 4, the sealing material (1)
Has a tubular shape made of rubber, resin, or the like. The outer diameter of the sealing material (1) is the same as the outer diameter of the valve casing (22), and
The fitting portion with 2) has a reduced diameter and fits inside the cylinder of the valve casing (22). Further, the outer diameter of the other end is expanded, and when fitted into the injection pipe (3), it comes into close contact with the injection pipe inner surface (32). Also, sealing material
The inner diameter of (1) is expanded at the fitting part with the valve casing (22),
When the mortar M is injected, the mortar M is smoothly injected.
In addition, the inner diameter of the other end is also expanded, and the water pressure of groundwater is shown in Fig. 4.
The outer surface (11) of the sealing material further comes into close contact with the inner surface (32) of the injection pipe because it is added from the direction A. The sealing material (1) is simply detachably fitted in the valve casing (22), and the pipe for mortar injection is used.
It may be mounted on (3), or may be mounted on the mortar injection tube (3) after being previously bonded with an adhesive or the like.

As shown in FIGS. 1 to 3, the valve plate (23) of the check valve (2) is made of a synthetic resin and has a screw (24) inside the valve casing (22).
It is installed by. The valve plate (23) is prevented from swinging inward of the tunnel by a valve seat (25) provided on the inner side of the tunnel inside the valve casing (22), and swings only in the outer direction of the tunnel. Is allowed. Check valve with the above configuration
It is desirable that the contact surfaces between the valve plate (23) and the valve seat (25) in (2) are in complete contact, but due to errors during molding, deformation, surface roughness, etc. As shown in FIG. 3 and FIG. 4, a gap (26) that allows the inflow and outflow of groundwater is created. Groundwater flowing out of the ground leaks through the gap (26). In the check valve (2) according to the present invention for preventing leakage of groundwater, an adhesive (81) such as SBR (main component styrene / butadiene copolymer synthetic rubber) is provided in the gap (26 ). the pouring and beaten with a diluent in order to weaken the adhesive force, that causes <br/> of penetration into the gap (26). The adhesive has water resistance and can be peeled or broken,
It is desirable to use one with weak adhesion.

The adhesive (81) seals the gap (26) formed between the valve plate (23) and the valve seat (25), and prevents groundwater from leaking into the tunnel from the check valve. In addition, when the mortar is injected from inside the tunnel, the adhesive pressure may change due to the injection pressure of the mortar.
(81) easily peels or breaks and does not interfere with mortar injection.

The check valve (2) having the above structure is provided with a mortar injection pipe.
A segment that is screwed into (3) and is assembled into a tubular shape
Fit in (4). Until the injection of mortar M is started,
The mortar injection pipe (3) is not sealed by the end plug (6), but the sealing material (1) is the groundwater to the contact surface (33) of the injection pipe (3) and the check valve (2). Of the valve plate (2
The gap (26) between 3) and the valve seat (25) is glued (81) .
Since it is glued together, there is no leakage of groundwater.

As shown in FIG. 2, the mortar injection hose (61)
Is connected to the mortar injection pipe (3), and the mortar M is filled into the void (51) formed between the drill hole (5) and the segment (4) through the check valve (2). At this time, the adhesive (81) in the gap (26) between the valve plate (23) and the valve seat (25) peels or breaks due to the injection pressure of the mortar, and the valve plate (23) shakes in the direction of the check valve tip. Move, valve seat
An inflow path for mortar is formed between (25). After the injection of mortar M, the valve plate (23) is moved to the valve seat (25) by the internal pressure of the mortar.
In a direction, the mortar flow passage is closed. At this time, the contact surface between the valve plate (23) and the valve seat (25) cannot be completely closed and a gap is inevitably left, but mortar has high viscosity and quick-drying property. A large amount of mortar does not flow out from the gap. After the mortar injection is completed, seal the sealant (1) and the check valve (2) with the mortar injection pipe.
Insert the end plug (6) into the injection tube (3) while leaving it in (3).
Screw on and seal.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

When the diameter of the mortar injection pipe is reduced from the portion where the thread groove is not cut, the outer diameter of the sealing material (1) at the tunnel outer end is not increased as shown in FIG. Good.

By adopting a structure in which the adhesive is used, not only the structure of the valve plate and the valve seat of the above-mentioned embodiment but also the leakage of groundwater can be prevented. Also, the method of infiltrating the adhesive is not limited to the method of pouring it by dissolving it in a solvent, and it is directly applied to the contact portion of the valve plate and the valve seat, or the contact portion of the valve plate and the valve seat is immersed in the diluent of the adhesive. You can adhere by doing
Yes . Further, the adhesive to be used is not limited to the adhesive of the above embodiment as long as the adhesive strength is weak, and an adhesive material capable of liquid-tightly closing the contact portion between the valve plate and the valve seat may be used. Good.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a check valve.

FIG. 2 is an enlarged sectional view of a segment.

FIG. 3 is a cross-sectional view of a check valve.

FIG. 4 is an enlarged cross-sectional view of a contact surface between a mortar injection tube and a check valve.

FIG. 5 is a sectional view of another embodiment of the check valve.

FIG. 6 is a sectional view of a tunnel.

FIG. 7 is an enlarged cross-sectional view of a conventional segment.

FIG. 8 is an enlarged cross-sectional view of a contact surface between a mortar injection tube and a check valve according to a conventional example.

[Explanation of symbols]

(1) Seal material (2) Check valve (22) Valve housing (23) Valve plate (25) Valve seat (3) Mortar injection pipe (4) Segment (5) Drill hole (51) Void (6) End Plug (61) Mortar injection hose (81) Adhesive

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Shimoda 3-12-1, Minamitsukaguchi-cho, Amagasaki-shi, Hyogo Izumi Co., Ltd. (56) References: 55-172489 (JP, U) 58-99397 (JP, U) Actual flat 2-129496 (JP, U) Actual flat 3-72995 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/00 E21D 11/08

Claims (2)

(57) [Claims] 1. A tunnel segment is provided in a gap (51) between the tunnel segment (4) and the excavation hole surface (5) of the ground (52).
(4) In order to inject mortar M from the inside, the segment
(4) fitted mortar injection tube (3) to be placed screwed in, the form cylinder to form a screw thread (21) on the outer peripheral surface valve housing (2
2) In a check valve having a valve plate (23) that opens only to the outside of the segment (4), a cylindrical valve casing (22) is formed by an elastic member at the tip in the screwing direction. A mortar injection check valve in a tunnel segment characterized by comprising a sealing material (1). Between 2. A check valve of the valve plate (23) the valve seat (25),
In mortar injection check valve into the tunnel segment according to claim 1, wherein the adhesive in the adhesive strength weak adhesive (81).