JPH1030394A - Injection hole of pipe used for pipe-jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently make the grout-injection hole of a pipe used for the pipe-jacking method and securely prevent water leakage thereof. SOLUTION: A check valve 16 for injection of grout into the outside of a pipe is inserted and fitted in a hole 13 formed to pierce the pipe wall 11 of the pipe for the pipe-jacking method and a spot facing 23 is formed at the periphery of the hole 13 on the inside face of the pipe. A cut-off plug 21 is inserted in the hole 13 at the inner side of the pipe than the check valve 16 and fitted thereto and a seal material 22 is compressed and arranged between the cut-off plug 21 and the spot facing 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an injection hole for a pipe for a propulsion method.

[0002]

2. Description of the Related Art A propulsion method is known as a method of burying a pipeline in the ground. In this propulsion method, as shown in FIG. 4, the starting pits 1 and the reaching pits 2 are cut at positions spaced apart in the horizontal direction, and a plurality of pipes 3 are moved from the starting pits 1 to the reaching pits 2. They are joined together and propelled underground. The starting pusher 1 is provided with a main push jack 4 for applying a propulsive force to the tube 3 and a reaction force receiving plate 5.

In such a propulsion method, during the propulsion, a large frictional force acts between the outer surface of the tubular body and the surrounding earth and sand so that the propulsion resistance does not occur. Injecting a lubrication between them. For this injection, a hole penetrating through the pipe wall of the pipe is formed, and through this hole, the lubricant is injected from inside the pipe to outside the pipe. After the completion of the propulsion operation, grout such as cement milk is backed up in the void formed outside the pipe by the propulsion using the holes. For this reason, this injection hole is called a grout injection hole.

FIG. 5 shows the structure of a conventional grout injection hole. Here, reference numeral 11 denotes a pipe wall of a pipe for a propulsion method, which is made of ductile cast iron or the like. An outer mortar layer 12 is formed on the outer surface of the tube wall 11. The grout injection hole is formed by a hole 13 penetrating through the tube wall 11, and an inner screw 14 is formed on the inner periphery of the hole 13. In a portion corresponding to the hole 13, the opening 15 is formed by removing the exterior mortar in a range larger than the hole 13.

A check valve 16 is screwed into the hole 13 on the outer surface side of the pipe wall 11 through an opening 15 at the time of manufacturing the pipe. The check valve 16 has a flow path 17 formed through the center thereof in the axial direction, and a valve element 18 capable of closing the flow path 17. It is configured to allow fluid to pass through. Resin is filled in a screw fitting portion 19 between the inner screw 14 of the hole 13 and the check valve 16 so that fluid does not leak through the screw fitting portion 19.

In such a configuration, at the time of propulsion of the pipe and at the end of the propulsion, the hole 13 on the inner side of the pipe wall 11 is formed.
By using a socket screwed into this portion, the lubricating material and the grout 20 are injected through the hole 13. At this time, since the check valve 16 is provided, the lubricating material and the grout 20 once injected are prevented from flowing back into the pipe due to the action of earth pressure or the like.

When the grout backfilling operation after the propulsion is completed, as shown in FIG. 6, a water stop plug 21 is screwed into the hole 13 on the inner surface side of the pipe wall 11 so as to surround the pipe. Groundwater is prevented from entering the pipe through the hole 13. That is, the water stop plug 2
O-ring 2 fitted in an annular groove formed in the end face
2 is pressed into contact with the periphery of the flow path 17 on the end face of the check valve 16 by screwing the water stop plug 21, thereby preventing water leakage from the flow path 17 into the pipe. As described above, the resin is filled in the screw fitting portion 19 between the inner screw 14 and the check valve 16, so that leakage of water from the screw fitting portion 19 into the pipe is also prevented.

[0008]

However, as described above, the resin must be filled into the screw fitting portion 19 between the inner screw 14 and the check valve 16, and in order to obtain the required water stopping performance, the resin must be filled. There is a problem that manufacturability is poor because filling must be surely performed. Further, if a water leakage accident occurs in the screwed portion 19 after the completion of the installation of the pipeline, the water leakage cannot be stopped by the water stop plug 21 having the above-mentioned structure, and it is difficult to repair the water leakage. There are also problems.

Accordingly, the present invention has been made to solve the above-mentioned problems and to make it possible to efficiently produce a grout injection hole in a pipe for a propulsion method and to reliably prevent the occurrence of water leakage. Aim.

[0010]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to a check for injecting grout to the outside of a tube formed in a propulsion method at an outer portion of a hole formed through the tube wall. A valve is inserted and attached, a counterbore is formed around the hole on the inner surface of the pipe, and a water stop plug is inserted and mounted in a hole on the inner side of the pipe than the check valve. The seal material is compressed and arranged between the counterbore and the counterbore.

[0011] With such a configuration, the space between the water stop plug and the counterbore portion of the hole inside the pipe than the check valve is sealed by the sealing material, so that the inside of the check valve and the check valve are checked. Water leakage into the pipe passing between the hole and the hole is reliably prevented.

Further, according to the present invention, a check valve for grout injection into the outside of the pipe is inserted into and attached to an outer portion of the hole formed through the pipe wall of the pipe for the propulsion method. A water-stop plug is inserted into and attached to the hole at the inner side of the pipe, an annular notch is formed on the outer periphery of the tip of the water-stop plug, and an annular sealing material is provided between the notch and the hole. Are compressed and arranged.

[0013] With such a configuration, the space between the water stop plug and the hole on the inner side of the pipe than the check valve is sealed by the sealing material, so that the inside of the check valve and the check valve and the hole are connected. Water leakage into the pipe through the gap is reliably prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. 1 by attaching the same reference numerals to the same members as those shown in FIGS. . Here, the pipe wall 1 on the inner side of the pipe than the check valve 16 in the hole 13
A counterbore portion 23 having a larger diameter than the hole portion 13
Are formed. This counterbore portion 23 has a counterbore surface 23b.
And the side surface 23c.

The distal end of the water stop plug 21 is screwed until it hits the check valve 16.
At the rear end, there is a flange portion 2 facing the counterbore surface 23b.
4 are formed. An annular rubber packing 22 such as an O-ring is fitted in an annular space 23a provided between the counterbore portion 23 and the flange portion 24.

As a result, the waterproof rubber plug 22 is screwed into the hole 13, so that the annular rubber packing 22 fitted in the annular space 23 a is compressed between the counterbore surface 23 c and the flange portion 24 of the plug 21. The flow path 1
Water is prevented from leaking from inside 7 to the inside of the pipe, and leaking into the inside of the pipe through the screwing portion 19 is also prevented. For this reason, water leakage to the inside of the pipe from the position of the annular rubber packing 22 is reliably prevented.

As described above, since water can be prevented from leaking into the inside of the pipe, work such as filling the screw fitting portion 19 of the check valve 16 with a resin for the purpose of preventing water from leaking into the pipe becomes unnecessary. Can be manufactured efficiently. Also, even if the annular rubber packing 22 is damaged and water leakage occurs, the repair can be easily performed only by a simple procedure such as replacing the annular rubber packing 22.

FIG. 2 shows another embodiment of the present invention.
Here, the hole 1 is provided on the inner surface of the tube wall 11 in the hole 13.
A tapered counterbore portion 26 larger than 3 is formed. The tapered counterbore portion 26 includes a counterbore surface 26a and a tapered side surface 26b whose diameter decreases toward the outside of the tube. Waterproof plug 2 in hole 13
1 is screwed in, the water stop plug is formed with a first flange 27 and a second flange 28 that fit into the tapered counterbore 26, and these flanges 2
A circumferential annular groove 29 is formed between 7 and 28. The plug 21 is inserted into the hole 13 with the annular rubber packing 22 previously set in the annular groove 29. At this time, insertion is easy due to the tapered shape of the tapered side surface 26b.

Therefore, also in the case of the embodiment of FIG. 2, the water stop plug 21 is screwed into the hole 13 so that
Tapered side surface 26b and circumferential annular groove 2 of plug 21
By compressing the annular rubber packing 22 between the inner ring 9 and the inner ring 9, water leakage from the flow path 17 to the inside of the pipe is prevented, and at the same time, water leakage to the inside of the pipe through the screwing portion 19 is prevented. Therefore, work such as filling the screwing portion 19 with resin is not necessary.

Further, even if the annular rubber packing 22 is damaged and water leakage occurs, the repair can be easily performed only by a simple procedure such as replacing the annular rubber packing 22. .

FIG. 3 shows still another embodiment of the present invention. Here, the check valve 1 extends along the axial direction of the hole 13.
An inner peripheral smoothing portion 24 is formed on the distal end portion of No. 6 and a part of the inner screw 14 at a portion corresponding to the inner side of the tube by a middle boring process.

The water stop plug 21 has an annular notch 21a formed on the outer periphery of the tip. This annular notch 2
1a is composed of a tapered surface 21b whose diameter decreases as the cross section goes toward the distal end side and a radial end surface 21c. Thereby, the inner peripheral smooth portion 24 of the hole 13 is formed.
When the plug 21 is inserted into the hole 13 in a state where an annular rubber packing 22 such as an O-ring is installed in advance, the annular rubber packing 22 is connected to the distal end portion of the check valve 16 and the inner peripheral smooth portion 24. The annular notch 21a is compressed between the three members.

Therefore, also in the case of the embodiment of FIG.
The tip of the check valve 16, the inner peripheral smooth portion 24, and the annular notch 21
By compressing the annular rubber packing 22 among the three members a, water leakage from the flow path 17 to the inside of the pipe is prevented, and at the same time, water leakage to the inside of the pipe through the screwing portion 19 is prevented. Further, by providing a tapered surface 21b having a tapered structure in the annular notch 21a of the plug 21, the water stopping performance between the check valve 16 and the plug 21 can be further enhanced. Therefore, work such as filling the screwing portion 19 with resin is not necessary.

Also, even if the annular rubber packing 22 is damaged and water leakage occurs, repair can be easily performed only by simple measures such as replacing the annular rubber packing 22. .

[0025]

As described above, according to the present invention, the check valve for injecting grout into the outside of the pipe is inserted into the outer portion of the hole formed through the pipe wall of the propulsion method pipe. Mounting, forming a counterbore around the hole on the inner surface of the pipe, inserting a water stop plug into the hole at the inside of the pipe than the check valve and mounting the water stop plug and the counterbore; The seal material is compressed and installed between the check valve, and this seal material seals the gap between the water stop plug and the counterbore portion of the hole inside the pipe rather than the check valve, so that the inside of the check valve and this Water leakage into the pipe passing between the check valve and the hole can be reliably prevented.

According to the present invention, a check valve for injecting grout to the outside of the pipe is inserted into and attached to the outer portion of the hole formed through the pipe wall of the propulsion method pipe. A water stop plug is inserted into and attached to the hole portion on the inner side of the pipe than the valve, an annular notch is formed on the outer periphery of the tip of the water stop plug, and an annular seal is provided between the notch and the hole. Since the material is compressed, the sealing material seals the gap between the water stop plug and the hole inside the pipe rather than the check valve, so that the inside of the check valve and the check valve and the hole can be connected. Leakage of water into the pipe through the space can be reliably prevented.

Therefore, according to the present invention, since water can be prevented from leaking into the inside of the pipe, it is not necessary to fill the check valve mounting portion with resin for the purpose of preventing water from leaking into the pipe. The injection hole can be manufactured efficiently, and even if water leaks due to breakage of the seal material, etc., only simple measures such as replacing the seal material are required.
It can be easily repaired.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an injection hole of a pipe for a propulsion method according to the present invention.

FIG. 2 is a sectional view showing another embodiment of an injection hole of a pipe for a propulsion method according to the present invention.

FIG. 3 is a sectional view showing still another embodiment of an injection hole of a pipe for a propulsion method according to the present invention.

FIG. 4 is a schematic view showing a conventional propulsion method.

FIG. 5 is a cross-sectional view showing a use state of a conventional grout injection hole.

FIG. 6 is a cross-sectional view showing a state in which a waterproof plug is attached to a conventional grout injection hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pipe wall 13 Hole 16 Check valve 21 Water stop plug 21a Annular notch 22 Annular rubber packing 23 Counterbore 26 Counterbore with taper

Claims (2)

[Claims] 1. A check valve for grout injection into the outside of a pipe is inserted into and attached to an outer portion of a hole formed through a pipe wall of a pipe for a propulsion method. A counterbore portion is formed around the periphery, a water stop plug is inserted and attached to a hole portion inside the pipe than the check valve, and a sealing material is compressed between the water stop plug and the counterbore portion. The injection hole of the pipe for propulsion method. 2. A non-return valve for grout injection into the outside of the pipe is inserted into and attached to the outer portion of the hole formed through the pipe wall of the propulsion method pipe. A water stop plug is inserted into and attached to the hole on the inside, an annular notch is formed on the outer periphery of the tip of the water stop plug, and an annular seal material is compressed between the notch and the hole. An injection hole for a pipe for propulsion method characterized by being arranged in a vertical position.