JPH0650464A - Method and apparatus for filling inner and outer cavities of sheath tube - Google Patents

Abstract

(57) [Summary] [Purpose] Not only in the case of large-diameter propulsion pipes, but also in the case of small-diameter propulsion pipes, continuous filling and backfilling prevent ground subsidence and simplify work. To obtain a method and a device for filling the inner and outer voids of a sheath, which can reduce the cost and shorten the construction period. [Structure] Injection tube 1 opening to one side of second void 9
The second gap 9 is filled with the filling material from 3 to be filled, and after the filling of the second gap 9 is completed, the filling material is continuously pumped and the first check valve 6 is used. Backfilling is performed by filling the voids 7 with a filler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is formed between a propulsion pipe (sheath pipe) laid by a propulsion method and a ground, and between a propulsion pipe and a main pipe drawn therein. The present invention relates to a method and an apparatus for filling an inner and outer space of a sheath tube for efficiently filling a space with a filler.

[0002]

2. Description of the Related Art When a propulsion pipe is laid by the propulsion method, it is formed between the propulsion pipe and the ground in order to prevent ground subsidence on the ground surface due to the influence of propulsion after the installation is completed. The void was filled with a backfill material such as mortar from the inside of the propulsion pipe (see, for example, FIG. 5 of JP-A-62-266288).

In this filling method, a small-diameter mortar-carrying filling pipe is installed on the ceiling of a segment, and an operator divides a certain section from the back of the filling pipe with a sandbag in the segment, and the section is divided into sections. The mortar is fed from the filling pipe, and the mortar is discharged from the cutting port of the filling pipe to fill the space. After the mortar has solidified, the sandbag is moved to partition the section following it, and the mortar in this section is filled. By repeating such an operation, the mortar is filled in the gap formed between the propulsion pipe and the ground over the entire length.

In general, when a propulsion pipe is used as a sheath pipe and the main pipe is drawn into the sheath pipe, the space formed by the main pipe and the sheath pipe is filled with a filling material such as mortar ( See, for example, JP-A-62-266288). Various methods are used to fill the filling material, but generally, the filling material is injected between the sheath and the main pipe by piping to solidify the filling material.

[0005]

The gap formed between the propulsion pipe and the ground as described above has a propulsion pipe diameter of 800 m.
If it is more than m, you can put a worker in the segment and perform a partition work with sandbags to fill the backfill material, but if the pipe diameter is less than 800 mm, such work by the worker is legal. It is prohibited by. Therefore, when the diameter of the propulsion pipe is less than 800 mm, backfilling is not actually performed, and there is a possibility that ground subsidence or the like may occur at a later date.

Also, in the case of filling the backfill material, the backfill work is generally included in the propulsion work of the propulsion pipe.
Since the filling work is included in the plumbing work, the same work using the same filling material is performed in two steps, which inevitably increases costs and extends the construction period.

According to the present invention, not only in the case of a large-diameter propulsion pipe but also in the case of a small-diameter propulsion pipe, the subsidence of the ground can be prevented and the work can be simplified by continuously filling the inside and backfilling. It is an object of the present invention to provide a method and a device for filling a void inside and outside a pipe, which can reduce the cost and the construction period.

[0008]

The method for filling the inner and outer cavities of a sheath pipe according to the present invention is a first gap formed between a sheath pipe and a natural ground laid by a propulsion method and the sheath pipe and the inside thereof. In the method of filling the second voids formed between the second voids with the main pipe drawn into the tube, the filler is filled into the second voids from an injection pipe opened to one side of the second voids. So as to fill the second gap, and after the filling of the second gap is completed, the filler is continuously fed under pressure so that the first gap is filled with the filler and backfilling is performed. It is the one.

Further, according to the present invention, the device for filling the inner and outer voids of a sheath has a seal member for closing both ends of the sheath and a pressure gauge, one end of which is connected to a pump for feeding the filler and the other end is An injection pipe opening to one side of the second space and a release valve, one end of which opens to the other side of the second space,
A release pipe having the other end opened to the atmosphere, and a check valve provided in the sheath pipe for opening and closing at least one opening provided in the sheath pipe are provided.

[0010]

Operation: Both ends of the sheath pipe into which the main pipe is drawn are closed by sealing members, and the relief valve is set to open. In this state, the filler is injected and filled in the second gap. When the filling is completed, the relief valve is closed and the feeding of the filling material is continued. As a result, the check valve is opened by the injection pressure of the filling material,
The filling material is injected into the first gap through the check valve. In this way, filling and backfilling are completed by continuous operation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an embodiment of the present invention. In the figure, 2 is a starting shaft provided on the ground 1, and 3 is a reaching shaft. 5 is a starting shaft 2 and a reaching shaft 3 by the propulsion method
In the present invention, it is used as a sheath pipe, and is referred to as a sheath pipe in the following description.
Reference numeral 6 denotes a normally-closed check valve installed in the sheath tube 5 one or more times, and opens and closes an opening (not shown) provided in the sheath tube 5. Reference numeral 7 is a first gap formed between the natural ground 1 and the sheath 5.

A main pipe 8 is drawn into the sheath pipe 5, and a second space 9 is formed between the main pipe and the sheath pipe 5. 10
Reference numerals a and 10b denote seal members that close the openings at both ends of the sheath tube 5.

Reference numeral 11 is a mixer provided on the ground, 12 is a pressure-feeding pump for filling material such as mortar produced by the mixer 11 and back-filling material (hereinafter referred to as "filling material"), and 13 is a discharge port of the pressure-feeding pump 12 at one end. With the filling material injection pipe connected,
An opening is formed between the sheath tube 5 and the main tube 8, and thus on the side of the starting shaft 2 in the second gap 9. Reference numeral 14 is a flow meter provided in the injection pipe 13 near the discharge port of the pressure pump 12, 15 is a pressure gauge provided in the injection pipe 13, and 16 is an opening / closing valve. Reference numeral 20 is a relief pipe having one end opened to the reaching shaft 3 side in the second gap 9 and the other end opened to the atmosphere, and is provided with a relief valve 21.

Next, the operation of the present invention will be described with reference to FIGS. First, the sheath pipe 5 laid by the propulsion method
The main pipe 8 is drawn in, the opening portions at both ends of the sheath pipe 5 are closed by the seal members 10a and 10b, the injection pipe 13 and the relief pipe 20 are set, and the opening / closing valve 16 and the relief valve 21 are set to open.

In this state, the pressure feed pump 12 is driven to feed the filling material under pressure, and the second material formed between the sheath pipe 5 and the main pipe 8 is discharged.
The filling material 25 is injected into the void 9 to fill the inside. When the filling 25 proceeds to the side of the reaching shaft 3 as shown in FIG. 2 as the filling progresses, the filling 25 flows out together with the air from the relief pipe 20, so that the filling can be detected.

When the filling is completed, the relief valve 21 is closed, and the feeding of the filling material 25 is continued. As a result, the check valve 6 provided in the second space 9 is filled with the filling material 25.
Is opened by the injection pressure of, and as shown in FIG. 3, the filler 25 is formed between the ground 1 and the sheath pipe 5 from the opening provided in the sheath pipe 5 through the check valve 6. First gap 7
And then backfilling is started.

When backfilling is completed, the pressure in the injection pipe 13 rises sharply. Therefore, the pressure gauge 15 detects this and stops the pressure feed pump 12, and the on-off valve 16 is closed to perform the filling and backfilling work. Complete. If an excessive pressure acts on the second space 9 during the backfilling work, the relief valve 21 is activated to reduce the internal pressure, so that the sheath pipe 5, the main pipe 8 or the injection equipment may be damaged. There is no. When the filling work and backfilling work are completed, the injection pipe 13 and the relief pipe 20 are withdrawn, but the check valve 6 is buried.

[0018]

As described above in detail, according to the present invention,
Since the worker does not have to enter the segment to carry out the filling and backfilling of the pods with one continuous operation, the filling and backfilling are performed regardless of the diameter of the pods. be able to. Therefore, there is no risk of subsidence, etc. at a later date, and it is safe and reduces cost.
It is possible to shorten the construction period.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of the present invention.

FIG. 2 is an explanatory view of the operation of the embodiment of the present invention.

FIG. 3 is an explanatory view of the operation of the embodiment of the present invention.

[Explanation of symbols]

 5 Sheath pipe 6 Check valve 7 First gap 8 Main pipe 9 Second gap 10a, 10b Sealing member 12 Pressure pump 13 Injection pipe 15 Pressure gauge 20 Relief pipe 21 Relief valve 25 Filling material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoyuki Masuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Tomiyuki Kito 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Co., Ltd.

Claims (2)

[Claims] 1. A first gap formed between a sheath pipe and a natural ground laid by a propulsion method and a second gap formed between the sheath pipe and a main pipe drawn therein. In the method of filling the filling material with the filling material, the filling tube is opened from one side of the second gap to the second
The filling material is pressure-fed and filled into the void, and the filling material is continuously fed after the filling of the second void is completed, and the filling material is filled into the first void through the check valve. A method for filling the inside and outside cavities of a pod that is characterized by backfilling. 2. A first gap formed between the sheath pipe laid by the propulsion method and the natural ground, and a second gap formed between the sheath pipe and the main pipe drawn therein. In each of the devices for filling the filling material, a sealing member for closing both ends of the sheath tube, and a pressure gauge, one end of which is connected to a pump for feeding the filling material,
An injection pipe having the other end opened to one side of the second space and a release valve, one end opened to the other side of the second space, and the other end opened to the atmosphere. And a check valve which is provided in the sheath tube and which opens and closes at least one opening provided in the sheath tube.