JP2602152B2 - Method and apparatus for filling inner and outer voids of sheath tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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 into the inside thereof. The present invention relates to a method and an apparatus for filling a gap inside and outside a sheath tube for efficiently filling a gap with a filler.

[0002]

2. Description of the Related Art When a propulsion pipe is laid by a propulsion method, it is formed between the propulsion pipe and the ground in order to prevent land subsidence or the like from occurring on the ground surface due to propulsion after completion of the laying. The gap 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).

[0003] In this filling method, a small-diameter mortar-conveying filling pipe is installed on the ceiling of a segment, and in the segment, an operator partitions a certain section from the back of the filling pipe with a sandbag, and places the section within the partitioned section. The mortar is sent from the filling tube, and the mortar is discharged from the cut end of the filling tube to fill the gap. After the mortar is solidified, the sandbag is moved to partition the following section, and the mortar in this section is filled. By repeating such an operation, the gap formed between the propulsion pipe and the ground is filled with mortar over the entire length.

In general, when a propulsion pipe is used as a sheath pipe and the main pipe is drawn into the inside, a gap formed by the main pipe and the sheath pipe is filled with a filling material such as mortar ( For example, see JP-A-62-266288). Various methods are used for filling such a filling material. In general, a filling material is injected between a sheath and a main pipe by a pipe to be solidified.

[0005]

The gap formed between the propulsion pipe and the ground as described above has a diameter of 800 m for the propulsion pipe.
If the pipe diameter is less than 800 mm, the work can be done by putting a worker in the segment, performing a partitioning operation with a sandbag, etc., and filling the backfill material. Prohibited by For this reason, when the pipe diameter of the propulsion pipe is less than 800 mm, backfill is not actually performed, and there is a possibility that land subsidence or the like may occur at a later date.

[0006] Also, when 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 the cost and extends the construction period.

According to the present invention, not only in the case of a large-diameter propulsion tube but also in the case of a small-diameter propulsion tube, continuous filling and backfilling are performed to prevent ground subsidence and simplify the operation. An object of the present invention is to provide a method and an apparatus for filling gaps inside and outside a pipe, which can reduce the cost and the construction period.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for filling inner and outer cavities of a sheath tube, comprising: a first cavity formed between a sheath tube laid by a propulsion method and a ground; Filling each of the second gaps formed between the main pipe and the main pipe drawn into the second pipe with a filler from an injection pipe opening on one side of the second gap to the second gap. After the filling of the second space is completed, the filling material is continuously pressure-fed even after the filling of the second space is completed, and the first space is filled with the filling material via a check valve to perform backfilling. It was made.

Further, the apparatus for filling the inner and outer gaps of a sheath tube according to the present invention has a seal member for closing both ends of the sheath tube, a pressure gauge, one end of which is connected to a pressure-feeding pump for filling, and the other end of which is connected to the above-mentioned pump. An injection pipe that opens on one side of the second gap, a release valve, one end of which opens on the other side of the second gap;
It has a release tube having the other end open to the atmosphere, and a check valve provided in the sheath tube and opening and closing at least one opening provided in the sheath tube.

[0010]

The sheath is retracted and both ends of the sheath are closed with seal members, and the relief valve is set to open. In this state, the filler is injected and filled into the second gap. When the filling is completed, the relief valve is closed and the pumping of the filler is continued. As a result, the check valve is opened by the injection pressure of the filler,
Filler is injected into the first gap via a check valve. In this manner, the filling and backfilling are completed by the continuous operation.

[0011]

FIG. 1 is an explanatory view of an embodiment of the present invention. In the figure, reference numeral 2 denotes a starting shaft provided on the ground 1 and reference numeral 3 denotes a reaching shaft. 5 is the starting shaft 2 and the reaching shaft 3 by the propulsion method
In the present invention, the propulsion pipe 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 attached to one or more sheath pipes 5 for opening and closing an opening (not shown) provided in the sheath pipe 5. Reference numeral 7 denotes a first gap formed between the ground 1 and the sheath tube 5.

Reference numeral 8 denotes a main pipe drawn into the sheath tube 5, and a second gap 9 is formed between the main tube 8 and the sheath tube 5. 10
Reference numerals a and 10b denote sealing members for closing the openings at both ends of the sheath tube 5.

Reference numeral 11 denotes a mixer provided on the ground; 12, a pump for feeding a filling material such as mortar and backfilling material (hereinafter referred to as “filling material”) generated by the mixer 11; With connected filler injection tube,
It is open between the sheath pipe 5 and the main pipe 8, and thus in the second space 9 on the side of the starting shaft 2. 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 on-off valve. Reference numeral 20 denotes a relief pipe having one end opening toward the arrival shaft 3 in the second gap 9 and the other end opening to the atmosphere, and having 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 both ends of the sheath pipe 5 are closed with sealing members 10a and 10b, the injection pipe 13 and the relief pipe 20 are set, and the on-off valve 16 and the relief valve 21 are set to open.

In this state, the pressure-feeding pump 12 is driven to pressure-feed the filler, and the second material formed between the sheath pipe 5 and the main pipe 8 is formed.
The filling material 25 is injected into the gap 9 of the above, and filling is performed. When the filling 25 proceeds to the arrival shaft 3 as shown in FIG. 2, the filling 25 flows out together with the air from the relief pipe 20, so that the completion of the filling can be detected.

When the filling is completed, the relief valve 21 is closed, and the feeding of the filler 25 is continued. Thereby, the check valve 6 provided in the second gap 9 is
As shown in FIG. 3, the filler 25 is formed between the ground 1 and the sheath tube 5 through the opening provided in the sheath tube 5 via the check valve 6 as shown in FIG. First void 7
And backfilling is started.

When the backfilling is completed, the pressure in the injection pipe 13 rises sharply. Therefore, this is detected by the pressure gauge 15, the pump 12 is stopped, the on-off valve 16 is closed, and the filling and backfilling work are performed. Complete. If an excessive pressure acts in the second gap 9 during the backfilling operation, the relief valve 21 is operated to reduce the internal pressure, so that the sheath 5, the main pipe 8, the injection equipment and the like may be damaged. There is no. When the filling and backfilling work is 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 pod tube is packed and backfilled by one continuous operation without the operator entering the segment, the stuffing and backfilling are performed regardless of the pipe diameter of the pod tube. be able to. Therefore, there is no possibility that land subsidence or the like will occur at a later date.
It is possible to shorten the construction period and the like.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 Reference Signs List 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 filler

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naoyuki Masuda 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Tomiyuki Kito 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan (56) References JP-A-2-11985 (JP, A) JP-A-64-26082 (JP, A) JP-A-62-266288 (JP, A) JP-A-4-30195 (JP, A) , U)

Claims (2)

(57) [Claims] 1. A first gap formed between a sheath tube laid by a propulsion method and a ground, and a second gap formed between the sheath tube and a main pipe drawn into the sheath tube. In the method of filling each with a filler, the injection pipe opened on one side of the second space is used to fill the second space.
And filling the second gap with the filler through a check valve, and filling the second gap with the filler after the filling of the second gap is completed. A method of filling inner and outer voids of a sheath tube, which comprises backfilling. 2. A first gap formed between a sheath pipe laid by a propulsion method and a ground, and a second gap formed between the sheath pipe and a main pipe drawn therein. In each of the apparatus for filling a filler, a seal member for closing both ends of the sheath tube, and a pressure gauge, one end is connected to a filler pump for filling,
An injection pipe having the other end open to one side of the second gap; and a release pipe having a release valve, one end opening to the other side of the second gap, and the other end opening to the atmosphere. And a check valve provided in the sheath tube for opening and closing at least one opening provided in the sheath tube.