JP2651647B2 - Backing material injection valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injecting a backing material between an outer peripheral surface of a tunnel lining wall such as a tunnel lining segment or a propulsion pipe constructed according to tunnel excavation and a tunnel digging surface. The present invention relates to a valve device.

[0002]

2. Description of the Related Art In a pipe propulsion method in which a pipe is propelled while digging through a tunnel and is buried in the ground, a backing material such as an antifriction material is used in order to reduce the propulsion resistance of the pipe against an excavated ground. From the inside of the tunnel through the pipe wall between the pipe and the excavated ground, and after completion of the propulsion and embedding of the pipe of a predetermined length, the injected backing material and hardened material Has been carried out to prevent the settlement of the ground. As such a backing material injection means, a butterfly valve as shown in FIG. 6 has been conventionally used. That is, the socket body A penetrating between the inner and outer peripheral surfaces of the pipe body P is inserted into an appropriate position of the pipe body P, and the butterfly valve B is mounted in the socket body S. .

[0003]

However, in the butterfly valve B, even if the backing material can be injected from the inside of the tubular body, it cannot be back-flowed. Therefore, it was necessary to provide a discharge port for the backing material and a closing means after the discharge, in a suitable position on the rear side of the pipe body separately from the butterfly valve B.
In addition, after the backing material is injected, the injection port is closed by screwing the bottomed plug G into the socket body S, which has a problem that the operation is troublesome. An object of the present invention is to provide a backing material injection valve device capable of completely solving such a problem.

[0004]

In order to achieve the above object, the backing material injection valve device of the present invention is mounted so as to penetrate a tunnel lining wall, such as a segment or a propulsion pipe, at an appropriate position and has an inner peripheral surface. An inner cylinder valve body whose upper and lower ends are hermetically sealed in an outer cylinder body provided with a circumferential groove and whose lower portion normally projects downward from the outer cylinder body is slidably inserted into the outer cylinder body. An upper opening and a lower opening are respectively pierced in the side walls of the upper end and the lower end of the body in a penetrating state, and a snap ring is provided on the outer peripheral surface of the intermediate portion so that the snap ring can be engaged with the above-mentioned peripheral groove. Is what it is.

[0005]

The inner cylinder valve body is pushed up by an appropriate amount with respect to the outer cylinder body fixed to the lining wall so that the upper opening protrudes between the lining wall and the excavated ground and the lower opening is formed in the tunnel. Is opened. Further, the front end opening of the backing material injection pipe is brought into close contact with the inner surface of the tunnel lining wall so as to cover the lower end of the inner cylinder valve body protruding inside the tunnel. In this state, when the backing material is pressure-fed and supplied from inside the tunnel through the injection pipe, the backing material passes through the inner cylinder valve body from the lower opening portion of the inner cylinder valve body opening inside the tunnel. From the lining wall and the tunnel excavation ground. When the lining wall is covered with the tubular resin film, a backing material is injected between the film and the lining wall.

Next, when the backing material and the hardening material are replaced after the formation of the tunnel lining wall of a predetermined length, the backing material injection valve device which is mounted at an appropriate position on the lining wall at one end of the tunnel. While injecting the hardening material in place of the backing material from above, the upper opening of the inner cylinder valve body of the valve device attached to the appropriate position of the lining wall at the other end of the tunnel is opened from the lining wall in the same manner as above. When it is pushed up until it protrudes upward, the backing material previously injected by the hardening material injected between the lining wall and the excavated ground through the inner cylinder valve body of the valve device at one end side is pushed down to the other end side. Then, it flows into the inner cylinder valve through the upper opening of the valve device at the other end, and is discharged from the lower opening of the inner cylinder valve.

At this time, in the same manner as described above, the lower end of the inner cylinder valve body of the valve device at the other end is covered with the distal end opening of the discharge pipe which is brought into close contact with the inner surface of the lining wall, thereby forming the discharge pipe. Through the backing material. After the replacement of the backing material and the hardening material is completed in this way, the snap ring in which the inner cylinder valve bodies of the two valve devices are mounted on the outer peripheral surface is provided in the circumferential groove provided on the inner peripheral surface of the outer cylinder body. When the inner cylinder valve body is further pushed up to the fitting position, the lower opening of the inner cylinder valve body is immersed in the outer cylinder body and locked in a state of being closely contacted, and the hardening material filling the inner cylinder valve body from the upper opening part is in the tunnel. Do not spill.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 1 denotes a segment lining assembled according to the excavation of a tunnel T by a tunnel excavator C such as a shield machine, or a propulsion burial in a tunnel. A backing material injection valve device V is mounted at an appropriate position at the front end of the lining wall 1 on the tunnel excavator C side.

As shown in FIG. 1, this valve device has an outer cylindrical body 2 fixed to a lining wall 1 so as to penetrate between inner and outer peripheral surfaces thereof, and a sliding member inside the outer cylindrical body 2. The inner cylinder valve body 3 is movably inserted, and the outer cylinder body 2 is formed to have substantially the same length as the thickness of the lining wall 1 and has a circumferential groove of an appropriate depth on the inner circumferential surface at the upper end thereof. Further, a ball plunger 6 which is constantly pressed against the outer peripheral surface of the inner cylinder valve body 3 by a spring 5 is provided at several locations on the inner peripheral surface at the lower end.

The inner cylindrical valve body 3 is formed to be longer than the outer cylindrical body 2, and normally has a lower part protruding downward from a lower end of the outer cylindrical body 2 and upper and lower ends sealed 3a, 3b. . Further, an upper opening 7 and a lower opening 8, which communicate between the inner and outer peripheral surfaces, respectively, are penetrated at several places on the upper end side wall and the lower end side wall of the inner cylinder valve body 3, and the upper opening side is formed. Reference numeral 7 is in close contact with the inner peripheral surface of the outer cylindrical body 2 and is closed, while the lower opening 8 is opened from the inner peripheral surface of the lining wall 1 into the tunnel. Further, a concave groove 10 is provided at the center of the outer peripheral surface of the inner cylindrical valve body 3 in the longitudinal direction, and a snap fit into the concave groove 10 in the peripheral groove 4 of the outer cylindrical body 2 and can be locked. The ring 9 is mounted, and an arc-shaped recess 11 into which the ball plunger 6 can be fitted is provided on an outer peripheral surface at an intermediate portion between the snap ring 9 and the lower opening 8. Reference numerals 12 and 13 denote sealing materials mounted on the outer peripheral surfaces of the upper and lower ends of the inner cylinder valve body 3.

The upper end sealing portion 3a of the inner cylinder valve body 3 is disposed in a recess 2a formed on the upper end surface of the outer cylinder body 2 and has a diameter larger than the outer diameter of the inner cylinder valve body 3. The outer peripheral portion projects outward from the upper end of the inner cylinder valve body 3, and in a normal state, the projecting lower surface is brought into contact with the upper end surface of the recess 2 a of the outer cylinder body 2 and the upper surface is formed on the outer cylinder body 2. Is immersed flush with or slightly below the upper end surface of the.

In order to inject a backing material such as an anti-friction material between the excavated ground A of the tunnel T and the lining wall 1 by the valve device V configured as described above, first, as shown in FIG. A sealing material 17 attached to the opening edge of the supply port 14 is provided by using an injection pipe 16 having a funnel-shaped supply port 14 at the tip and having a push-up rod 15 in the center of the inside thereof. The valve device V is brought into close contact with the inner surface of the lining wall 1 at the outer periphery of the base end of the outer cylinder 2.

The supply port 14 of the injection pipe 16 is formed to have a diameter equal to or slightly larger than the outer diameter of the outer cylindrical body 2 and a push-up rod 15 disposed inside is provided with an inner cylindrical valve body 3. Is configured to be pressed against the lower surface of the lower end sealing portion 3b. Also,
As shown in FIG. 2, the injection pipe 16 has an L-shaped lower end bent and slidably and water-tightly penetrates and supports the lower end of the push-up rod 15 at the bent portion. In addition, it is connected and communicated with an injection hose 18 disposed through a tunnel T.

In this state, when the lower end of the push-up rod 15 protruding downward from the injection pipe 16 is pushed up, the inner cylinder valve body 3 is pushed up by the upper end surface of the rod 15, and as shown in FIG. The upper end of the inner cylinder valve body 3 projects from the lining wall 1 toward the excavation ground A, and communicates the upper opening 7 between the lining wall 1 and the excavation ground A, and the lower opening 8 is connected to the outside. The ball plunger 6 mounted on the inner peripheral surface of the lower end portion of the outer cylinder 2 fits into the recess 11 of the inner cylinder valve body 3 before being immersed in the cylinder 2, and the upward movement of the push-up rod 15 is caused by the resistance. To stop. Next, when the backing material is supplied from the inside of the injection hose 18 to the supply port 14 side of the injection pipe 16, the backing material flows into the inner cylinder valve body 3 from the lower opening 8 of the inner cylinder valve body 3. Further, the gas is injected between the excavated ground A and the lining wall 1 from the upper opening 7 through the inner cylindrical valve body 3.

Next, after the tunnel lining wall 1 having a predetermined length has been constructed, the backing material and the hardening material filled between the excavated ground A and the lining wall 1 are replaced by a hardening material as shown in FIG. As shown in FIG. 5, a valve device V 'having the same structure is mounted on the other end side of the lining wall 1 and the supply port hoses 18a are similarly joined to the valve device V', respectively. Further, by pushing up the push-up rod 15, the inner cylindrical valve body 3 is moved upward in the same manner as the valve device V on one end side, so that the upper opening 7 is communicated with the excavation ground A side. In this state, when a hardening material is fed between the excavated ground A and the lining wall 1 from the injection hose 18 through the lower opening 8 of the inner cylinder valve body 3 of the valve device V at one end, the backing material is hardened. The material is pushed toward the other end according to the flow of the material, flows into the inner cylinder valve body 3 from the upper opening 7 of the other valve device V ', and is discharged from the lower opening 8 into the hose 18a. When the injection is performed from the valve device V, the inner cylinder valve body 3 may not necessarily be pushed up by the rod 15, but may be pushed up by the injection pressure of the injection material.

When the replacement between the backing material and the hardening material is completed in this way, the push-up rods 15 of the hoses 18 and 18a are further pushed up, and the push-up force causes the ball plunger 6 of the outer cylinder 2 to move inward from the ball plunger 6. The locking recess 11 of the cylinder valve body 3 is disengaged, and the inner cylinder valve bodies 3 of both valve devices V and V 'further move upward. Then, as shown in FIG. 5, the inner cylindrical body 3 is inserted until the snap ring 9 mounted on the outer circumferential surface of the inner cylindrical valve body 3 fits into the circumferential groove 4 provided on the inner circumferential surface of the outer cylindrical body 2. Is pushed up, the inner cylinder valve body 3 is locked to the outer cylinder body 2, and the lower opening 8 of the inner cylinder body valve 3 is immersed in the outer cylinder body 2 to be in a close contact state. The outflow of the hardening material is prevented.

In the case of covering the lining wall 1 by feeding a cylindrical synthetic resin film D from the rear end of the tunnel excavator C to the outer peripheral surface of the lining wall 1 in accordance with the excavation of the tunnel T, A backing material is injected between the wall 1 and the tubular film D, and the backing material is replaced with a hardening material in the same manner as described above. Further, in the above embodiment, the upper and lower openings 7 and 8 are respectively inserted into the excavated ground A and the inside of the tunnel T by fitting the ball plunger 6 mounted on the outer cylinder 2 into the recess 11 of the inner cylinder valve 3. Is set to be in a communication state, but the communication state as described above may be made by using the pushing-up amount of the push-up rod 15 without using such a ball plunger 8.

[0018]

As described above, according to the backing material injection valve device of the present invention, the backing material injection valve device is mounted so as to be penetrated at an appropriate position of a tunnel lining wall such as a segment or a propulsion pipe and provided with a circumferential groove on an inner circumferential surface. The upper and lower ends of the inner cylindrical valve body are slidably inserted into the outer cylindrical body whose upper and lower ends are sealed and the lower part of the inner cylindrical valve body normally projects downward from the outer cylindrical body. Since the upper opening and the lower opening are respectively pierced in the side wall of the portion in a penetrating state, and a snap ring which can be locked in the peripheral groove is provided on the outer peripheral surface of the intermediate portion, the inner cylinder is provided. By moving the valve body upward by a predetermined dimension, the backing material can be smoothly injected between the lining wall and the excavated ground from inside the tunnel through the upper and lower openings of the inner cylindrical valve body. .

Further, when the backing material is replaced with the hardening material after the formation of the tunnel lining wall having a predetermined length, the valve device is mounted on the other end of the lining wall and then mounted on one end. When the hardening material is injected in the same manner as described above in place of the backing material from the valve device, the hardening material is filled between the excavated ground and the lining wall, while the backing material is extruded to the other end side. It can be easily discharged through the valve device on the other end side, and the backing material and the hardening material can be efficiently replaced. At this time, also in the valve device on the other end side, the upper and lower openings are maintained in an open state by a predetermined amount of projection of the inner cylinder valve body, and the opening serves as a backing material discharge port, and the backing material discharges. Discharge is performed smoothly and reliably.

After the replacement of the backing material and the hardening material, the inner cylinder valve bodies of the two valve devices are further pushed out toward the excavated ground, and the lower opening of the inner cylinder valve body is immersed in the outer cylinder body. While being in close contact, the snap ring mounted on the outer peripheral surface of the inner cylinder valve body is fitted and locked in the circumferential groove provided on the inner peripheral surface of the outer cylinder body, and the hardened material filling the inner cylinder valve body is filled in the tunnel. It is possible to completely prevent the flow out of the inner cylinder valve body.In addition, the operation of pushing up the inner cylinder valve body can be automated by a robot, and the backing material injection work and the backing material can be performed. The replacement operation with the hardening material can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a valve device,

FIG. 2 is a simplified longitudinal side view showing a state of construction of a lining wall,

FIG. 3 is a longitudinal sectional side view showing a state where a valve body is opened;

FIG. 4 is an overall view when a backing material is replaced with a hardening material,

FIG. 5 is a longitudinal sectional side view showing a state where a valve is locked after replacement;

FIG. 6 is a vertical sectional side view showing a conventional valve device.

[Explanation of symbols]

 Reference Signs List 1 lining wall 2 outer cylinder 3 inner cylinder valve 4 peripheral groove 7 upper opening 8 lower opening 9 snap ring

Claims (1)

(57) [Claims] An upper and lower end is hermetically sealed in an outer cylindrical body which is mounted in a proper position on a tunnel lining wall such as a segment or a propulsion pipe and has a circumferential groove on an inner circumferential surface, and a lower portion of the outer cylindrical body in a normal state. The inner cylinder valve body projecting downward from the outer cylinder body is slidably inserted, and the upper and lower openings penetrate the upper and lower side walls of the inner cylinder valve body, respectively. A backing material injection valve device characterized in that a snap ring that can be engaged with the peripheral groove is provided on the outer peripheral surface of the intermediate portion at the same time.