JPH06272482A - Lubricant or back-filling material filling method in double pipe propulsion construction method - Google Patents

Abstract

PURPOSE:To facilitate the positioning of a filling member at the time of filling lubricant or back-filling material in a gap between a double pipe and the natural ground by piercing a shield pipe, provided at a double pipe formed of a inner pipe and an outer pipe, with a filling member for filling lubricant or back-filling material. CONSTITUTION:At the time of driving forward a double pipe A with a shield pipe 3 and a check valve 4 formed axially between an inner pipe 1 and an outer pipe 2, or after laying a pipeline, the shield pipe 3 is pierced with a filling member 11 with two packers 15, 16 disposed at a space equal to the length of the double pipe A, or a filling member 11 with two packers 15, 16 disposed at a space corresponding to plural double pipes A, and a hose 12 connected to the member 11; and the packers 15, 16 are expanded in the desired positions for fixing. Since one or plural check valves 4 are opposed between two packers regardless of the elongation of the hose 12, the alignment of the filling member becomes extremely easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection method for injecting a lubricant between a double pipe and a ground when propelling a double pipe consisting of an inner pipe and an outer pipe to lay a pipeline. The present invention relates to a method of laying a pipeline and then injecting a backfill material between the pipeline and the ground.

[0002]

2. Description of the Related Art When laying a sewer pipe or a water pipe, an excavator is installed at the beginning and a pipe such as a fume pipe or an iron pipe is continuously connected to the rear end of the excavator and is propelled by an extruding device. The propulsion method is adopted. In this method, in order to reduce the frictional resistance generated between the outer circumference of the excavator and the ground and between the outer circumference of the pipe and the ground, a lubricant is injected between the outer circumference of the pipe and the ground. There is. When the inner diameter of the pipe is 800 mm or more, after the pipe is laid, the backfill material is filled in the gap formed between the outer periphery of the pipe and the ground.

In the pipe having an inner diameter of 800 mm or more used in the above-mentioned construction method, a hole for connecting a hose for injecting a lubricant or a backfill material is previously formed between the outer periphery of the pipe and the ground at a predetermined position. ing. Then, during or after laying the pipeline, a worker with a hose for supplying the lubricant or backfill material enters the inside of the pipe, connects the hose to the hole, and installs it on the ground. By supplying the lubricant and the backfill material from the material supply device or the backfill material supply device, they are injected between the pipeline and the natural ground. However, if the inner diameter of the pipe is 800 mm or less, it is not possible to inject the backing material between the pipe line and the ground because the law prohibits workers from entering inside the pipe.

On the other hand, a pipe for supplying gas such as city gas and natural gas may be laid underground. In this case, a pipe line consisting of a fume pipe with an inner diameter that is sufficiently larger than the outer diameter of the pipe that supplies gas by the propulsion method is laid in advance, and after filling the gap between this pipe line and the ground with a backfill material. Generally, a conduit for circulating gas is formed inside the fume tube.

[0005]

In the case of laying a gas supply pipe, if the fume pipe is laid in advance as described above and then the gas supply pipe is laid inside the pipe, the construction period becomes long and There is a problem that the installation cost will increase. For this reason, the inventors of the present invention laid a pipeline for supplying gas by advancing a double pipe in which an inner pipe and an outer pipe are integrally configured in advance to the excavator and propelling them while welding and joining the inner pipes. We have developed a construction method.

In the above-mentioned pipeline, since the inner tube is required to have a high degree of airtightness, it is not possible to form a hole for connecting a hose for supplying a lubricant or a backing material to the inner tube. For this reason, a sheath tube for inserting an injection member for injecting a lubricant or a backfill material is previously provided between the inner tube and the outer tube, and a check valve is provided on the outer tube. Then, the injection member is inserted into the sheath and fixed at a desired position to inject the lubricant or the backing material.

[0007] When pouring a lubricant or backfill between the double pipe and the ground, a positioning work to face the check valve by pulling and moving the injection member inserted in the sheath by a winch or the like. Is done. At this time, since the injection member moves while contacting the inner surface of the sheath tube, the hose supplying the lubricant or the backing material expands due to frictional resistance, and it is difficult to accurately position the injection member. There is.

When a hose having a high hardness is used to reduce the elongation, the allowable bending radius of the hose becomes large, and the hose reel must have a large diameter or a large traction force is required.

An object of the present invention is to provide a method for injecting a lubricant or backing material, which makes it possible to easily position the injection member so as to face the check valve regardless of the extension of the hose. is there.

[0010]

In order to solve the above-mentioned problems, the method for injecting the lubricant or backing material in the double pipe propulsion method according to the present invention is a pipe between the inner pipe and the outer pipe. A double pipe with a sheath pipe provided in the longitudinal direction of the outer pipe and a check valve for connecting the outer pipe to the outside of the outer pipe and a double pipe when laying a pipeline after the excavator. It is an injection method of injecting a lubricant between the ground and a method of injecting a backing material between the double pipe and the ground after laying a pipeline, and the length of the double pipe to be promoted Injection in which two packers are arranged at equal intervals or at intervals substantially equal to the length of a plurality of double pipes, and a discharge port for discharging lubricant or backfill material is provided between these packers. Connect the member to the tip of the hose, insert the injection member and the hose into the sheath tube, expand the packer at the desired position, and fix it. Then, after that, the lubricant or backfill material is supplied through the hose to be discharged from the discharge port of the injection member, and the lubricant or backfill material is connected to the double pipe and the ground through the check valve. It is characterized by injecting between.

[0011]

[Operation] According to the method for injecting the lubricant or the backing material in the double pipe propulsion method (hereinafter simply referred to as "injection method"),
Even if the hose stretches when pulling the injection member inserted in the sheath, it is easy to move the injection member to the position where it faces the check valve without being affected by this expansion, and the double pipe and ground Lubricants or backfills can be injected between the mountains.

That is, two packers having the same length as the double pipe are arranged, and a discharge port for discharging the lubricant or the backing material is provided between the packers to connect the injection member to the hose. Therefore, when pouring the lubricant, the double pipe was laid during the laying of the double pipe, and when the backfill material was filled, the double pipe was laid, and then the injection member was provided between the inner pipe and the outer pipe. If the injection member is inserted into the sheath and pulled and moved, and the injection member is fixed at an arbitrary position, the distance between the two packers is equal to the length of the double pipe, even if the hose is stretched by the pull. become longer.

Therefore, no matter what position the injection member is fixed and what kind of expansion the hose has, the check valve provided in the outer pipe is located between the two packers of the injection member. Therefore, the injection member can be easily opposed to the check valve regardless of the elongation generated in the hose, and the work of injecting the lubricant or the backfill material can be easily performed.

Moreover, the positioning becomes easy regardless of the elongation of the hose. Therefore, it is possible to use a hose having low hardness and a small allowable bending radius, and it is possible to reduce the size of the hose reel.

Further, when the interval between the packers constituting the injection member is set to a length corresponding to a plurality of double pipes, a plurality of check valves are simultaneously provided between the double pipes and the ground to prevent slipping or sliding. The backing material can be injected.

[0016]

EXAMPLE An example of the injection method will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a state of injecting a lubricant between a double pipe being propelled and a natural ground, and FIG. 2 is a sectional view for explaining a structure of an injecting member.

The injection method according to the present invention employs a commonly used semi-shielding method to propel a double pipe consisting of an inner pipe and an outer pipe to lay a pipe line and to lay an outer pipe and a natural ground. The backing material is injected into the gap formed between the outer pipe and the ground after the lubricant is injected into the gap formed between the outer pipe and the pipeline. In the present invention, the method of injecting the lubricant and the method of injecting the backing material are substantially the same,
The case of injecting a lubricant will be described below as a representative.

First, the schematic structure of the double pipe A will be described with reference to FIG. The double tube A in FIG. 1 is schematically shown in terms of size and shape. Double pipe A is inner pipe 1 and outer pipe 2
The inner tube 1 is held by a bracket (not shown) formed between the inner tube 1 and the outer tube 2. The inner pipe 1 and the outer pipe 2 are each made of a steel pipe having a preset diameter.

The double pipe A in this embodiment is intended to supply a combustible gas, and the inner pipe 1 is required to have a high degree of airtightness. For this reason, when connecting the new double pipe A to the already promoted double pipe A, the inner pipe 1 is welded over the entire circumference.

A sheath tube 3 is provided between the inner tube 1 and the outer tube 2 and in the longitudinal direction of the double tube A for inserting the injection member 11 shown in FIG. Further, a check valve 4 connected to the sheath tube 3 and opened to the outer circumference of the outer tube 2 is provided at a predetermined position of each outer tube 2. The check valve 4 injects a lubricant or backfill material into a gap 5 formed between the outer pipe 2 and the ground, and allows groundwater and the like in the gap 5 to penetrate into the double pipe A. Is to prevent.

The double pipe A constructed as described above is propelled by the original pushing device 6. That is, the excavator 8 having the winch 9 in which the wire 9a is wound by the original pushing device 6 is installed so as to match the pipeline to be laid on the starting shaft 7 provided at a predetermined position, and A double pipe A following the excavator 8 is propelled toward an arrival shaft (not shown), and when the excavator 8 arrives at the arrival shaft, a target pipeline is laid between these shafts.

Next, the construction of the lubricant injection device B for injecting the lubricant into the gap 5 formed between the outer pipe 2 and the ground when propelling the double pipe A will be described with reference to FIGS. 1 and 2. To do. This lubricant injection device B includes a pump 10 for pumping lubricant, and a hose having one end connected to the pump 10 and the other end attached with an injection member 11.
It comprises a reel 12, a reel 13 around which the hose 12 is wound, and an operation panel 14 for controlling the injection work of the lubricant.

The injection member 11 has two packers 15 arranged at an interval equal to the length of the double tube A (for example, 6000 mm) or at an interval corresponding to the length of the plurality of double tubes A (for example, 30000 mm). , 16 and packers 15,
It is configured by connecting 16 with a hose 17.

The packers 15 and 16 are for fixing the injection member 11 which is inserted into the sheath tube 3 and is pulled to a desired position when the lubricant is injected into the gap 5, and each has flexibility. It has a rubber tube 18. And injection member
After inserting 11 into the sheath tube 3 and moving it to a desired position, pressure gas is supplied to expand the tube 18 and bring the tube 18 into close contact with the inner surface of the sheath tube 3, thereby providing an injection member.
The tube 11 is fixed and isolated from other parts by the expanded tube 18.

A nipple 15a connected to the hose 12 is formed at one end of the packer 15, and a tube 18 is provided inside.
A flow pipe 19 for flowing pressure gas such as compressed air or nitrogen gas for expanding the pipe and a passage 15b for flowing the lubricant between the flow pipe 19 and the flow pipe 19 are formed, and the lubricant supplied to the other end is sheathed. A discharge port 15c for discharging the inside of the pipe 3 is formed. The end of the distribution pipe 19 opens in the hose 17,
The pressure gas supplied to 19 passes through hose 17 and packer 16
Is supplied to.

A passage 16a for circulating a pressure gas is formed inside the packer 16, and the tube 18 is expanded by the pressure gas supplied to the passage 16a. A hook 16b for connecting the wire 9a wound around the winch 9 is provided at the tip of the packer 16.

Next, a procedure for injecting the lubricant into the gap 5 formed between the outer tube 2 and the ground when propelling the double tube A will be described. The wire 9a wound around the winch 9 of the excavator 8 is inserted into the sheath 3 provided in advance in the double pipe A.
Then, the hook 16 provided at the tip of the packer 16 of the injection member 11
By operating the winch 9 by connecting the wire 9a to b, the injection member 11 and the hose 12 connected to the member 11 are pulled to be inserted into the sheath tube 3 and moved to the excavator 8 side.

The pulling causes tension to act on the hose 12 to cause it to stretch. The elongation that occurs in the hose 12 is
It depends on the frictional resistance and other loads when it is towed.
Therefore, even if the length of the wire 9a is measured while pulling the injection member 11 to move it in the sheath tube 3,
It is difficult to know accurately whether 11 is at the position facing the check valve 4.

However, by setting the interval between the two packers 15 and 16 constituting the injection member 11 to the same size as the double tube A, regardless of the position of the injection member 11 in the sheath tube 3, Packer 1 no matter how the hose 12 grows
One check valve 4 is always located between 5 and 16. Further, when the interval between the packers 15 and 16 is set to a length corresponding to a plurality of double tubes A, a plurality of packers are provided between the packers 15 and 16 regardless of the position of the injection member 11 in the sheath tube 3. The check valves 4 face each other.

Therefore, while the double pipe A is being propelled, the double pipe A is
When pouring lubricant into the gap 5 formed between the ground and the ground,
The relative position between the injection member 11 and the check valve 4 can be set very easily.

That is, even if a hose having a low hardness is used as the hose 12, the influence of elongation of the hose can be eliminated. Therefore, it is possible to reduce the diameter of the hose reel 13 by using a hose having a low hardness and thus a small allowable bending radius, and it is possible to reduce the output of the motor that drives the reel 13.

In the above-described embodiment, the case where the lubricant is injected into the gap 5 has been described. However, even when the backing material is injected, the injection member 11 having the same structure as that of this embodiment is used. In addition, it is possible to easily inject the backing material by using the backing material injection device having the same configuration and performing the same operation.

[0033]

As described above in detail, in the method of injecting the lubricant or backing material in the double pipe propulsion method according to the present invention, the injection member is non-returned regardless of the elongation generated in the hose. Positioning with respect to the valve can be done very easily. Therefore, the double pipe laying work can be performed easily and quickly.

Further, since it is possible to eliminate the influence of elongation occurring in the hose, it is possible to use a hose having a low hardness and therefore a small allowable bending radius, and it is possible to use a hose reel diameter and a motor for driving the reel. It has a feature that the output and the like can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a state in which a lubricant is injected between a double pipe being propelled and a natural ground.

FIG. 2 is a cross-sectional view illustrating the configuration of an injection member.

[Explanation of symbols]

 A double pipe B lubricant injection device 1 inner pipe 2 outer pipe 3 sheath pipe 4 check valve 5 clearance 8 excavator 9 winch 10 pump 11 injection member 12 hose 13 reel 14 operation panel 15, 16 packer 15b passage 15c discharge port 17 Hose 18 Tube 19 Distribution tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Niiyama 5-14-10-310 Sagamigaoka, Zama City, Kanagawa Prefecture (72) Inventor Hideki Uno 1118-22 Wakamatsucho, Tokorozawa City, Saitama Prefecture

Claims (2)

[Claims] 1. An excavator having a double pipe in which a sheath pipe is provided between an inner pipe and an outer pipe in a longitudinal direction of the pipe and a check valve for connecting the outer pipe to the outside of the outer pipe is provided on the outer pipe. Injection method of injecting a lubricant between the double pipe and the ground when laying a pipeline after it or injecting a backing material between the double pipe and the ground after laying the pipeline A pouring member provided with two packers arranged at intervals substantially equal to the length of the double pipe to be propelled and having a discharge port for discharging the lubricant or backfill material between these packers. To the tip of the hose, insert the injection member and the hose into the sheath tube, inflate and fix the packer at a desired position, then supply the lubricant or backing material through the hose and inject it. Discharge from the discharge port of the member and inject the lubricant or backfill material between the double pipe and the ground through the check valve. A method for injecting a lubricant or backing material in a double pipe propulsion method characterized by the above. 2. A double pipe excavator in which a sheath pipe is provided in advance in the longitudinal direction of the pipe between the inner pipe and the outer pipe, and a check valve for connecting the outer pipe to the outside of the outer pipe is provided in the outer pipe. Injection method of injecting a lubricant between the double pipe and the ground when laying a pipeline after it or injecting a backing material between the double pipe and the ground after laying the pipeline In the method, two packers are arranged at intervals substantially equal to the length of a plurality of double pipes, and an injection member provided with a discharge port for discharging a lubricant or backfill material is provided between these packers. Connected to the tip of a hose, insert the injection member and the hose into the sheath tube, inflate and fix the packer at a desired position, and then supply a lubricant or backing material through the hose to inject the injection member. And to inject the lubricant or backfill material between the double pipe and the ground through a check valve. Method for injecting lubricant or backing material in double pipe propulsion method characterized by the above.