JP3103474B2 - Sliding material injection method in double pipe propulsion method - 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 of propelling a double pipe consisting of an inner pipe and an outer pipe to lay a pipe between a start shaft and an arrival shaft, and to provide a sliding material between the double pipe and the ground. More particularly, the present invention relates to a method for injecting a lubricating material, which is preferable when the length of the pipeline is increased.

[0002]

2. Description of the Related Art In some cases, a double pipe comprising an inner pipe and an outer pipe made of a steel pipe is laid underground by a propulsion method to construct a pipe for supplying a gas such as a city gas or a natural gas. When a double pipe is propelled, frictional resistance is generated between the double pipe and the ground, and a large thrust is required. For this reason, a discharge port is provided in the outer pipe, and the sliding material is discharged from the discharge port and injected between the double pipe and the ground to reduce frictional resistance.

[0003] The lubrication efficiency of the lubricating material injected between the double pipe and the ground decreases due to the mixing of earth and sand or groundwater. Are arranged at intervals capable of maintaining the above-mentioned conditions, and injection is performed simultaneously from these discharge ports.

[0004]

When laying a pipeline in the ground, it is necessary to construct a plurality of shafts. However, the cost of constructing the shaft is enormous, and the number of shafts to be constructed is reduced. It is required to reduce the installation cost. For this reason, the laying length of the pipeline consisting of a double pipe becomes long, and the pipeline resistance in the path for supplying the lubricant to the discharge port increases, thereby increasing the discharge pressure of the pump or reducing the diameter of the supply pipe. There are problems such as the need to increase the size. Then, in order to solve the above-mentioned problems, problems such as an increase in equipment costs have arisen.

An object of the present invention is to propose a method capable of injecting a lubricating material along with the propulsion of a double pipe without largely changing the equipment even if the pipe length is long. It is.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method for injecting a lubricating material in a double-pipe propulsion method according to the present invention includes the steps of: A method of injecting lubricating material in a double pipe propulsion construction method in which a double pipe is made to follow and is propelled by a main pushing device and the double pipe is laid from a start shaft to an arrival shaft. Corresponding to the number of double pipes with a supply tube for supplying sheath and lubricating material, and a winch around which a wire is wound and a supply pipe for the double pipes. An excavator provided with a lubricant distribution device having a valve that connects the excavator with a double pipe following the excavator to connect the supply pipe and the distribution device of the double pipe and to wire the inside of the sheath pipe. The lubricating material supplied through the supply pipe is injected between the double pipe and the ground while propelling through the When the extension distance of the double pipe reached the predetermined value, the injection member is connected to the wire inserted into the sheath of the subsequent double pipe, and the supply pipe is connected with the subsequent propulsion of the double pipe. Injecting the supplied sliding material between the double pipe and the ground, and moving the injection member inside the sheath to inject the sliding material from the desired position between the double pipe and the ground. It is a feature.

[0007]

According to the above-mentioned method for injecting a lubricating material, even when a long pipeline is laid, the lubricating material can be smoothly injected between the double pipe and the ground without largely changing the equipment. Can be promoted.

[0008] That is, a sheath is provided between the inner pipe and the outer pipe constituting the double pipe, and a supply pipe for circulating the sliding material is provided between the inner pipe and the outer pipe, and a winch in which a wire is wound around an excavator is provided. A distribution device for distributing the lubricant to the supply pipe is provided,
When propelling the double pipe that constitutes the pipeline on the arrival shaft,
By inserting only the wire inside the sheath tube and supplying the lubricating material supplied through the distribution device to the supply tube, the lubricating material is injected from the supply tube between the double tube and the ground. I can do it.

As described above, the double pipe is propelled, and when the propulsion length reaches a predetermined distance, the injection member is connected to the wire and the member is inserted into the inside of the sheath to reach a desired position. The sliding material discharged from the injection member at this position can be injected between the double pipe and the ground.

[0010] In the injection method according to the present invention, when connecting the pump for feeding the lubricating material to the distribution device, a pipe or hose having a desired diameter disposed inside the inner pipe can be used. . When the laying length of the double pipe is increased, the length of the supply pipe is accordingly increased, and the line resistance is increased. However, the diameter of the pipe or hose can be set so that the pipe resistance does not greatly increase even when the length of the double pipe is increased.

Therefore, the total extension distance of the supply pipe is kept within a certain range according to the conditions such as the diameter of the supply pipe and the viscosity of the lubricating material, and when the double pipe corresponding to the position beyond the range is propelled. ,
By injecting the lubricating material from the injection member inserted into the inside of the pod, even if the length of the pipeline is increased, the lubrication can be performed without increasing the pump output or increasing the diameter of the supply pipe. Material can be injected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a method for injecting a lubricant will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view showing a case where the laying distance of the pipeline is short and the lubricating material supplied from only the supply pipe is injected between the double pipe and the ground, and FIG. FIG. 3 is a schematic explanatory view in the case of simultaneously injecting the supplied lubricating material and the lubricating material supplied through the sheath tube, FIG. 3 is a diagram illustrating a configuration of a double pipe, and FIG. 4 is a diagram illustrating a configuration of an injection member. .

In the present invention, when a double pipe consisting of an inner pipe and an outer pipe is to be propelled by employing a semi-shield method, especially when a so-called long-distance propulsion in which the distance between the start shaft and the arrival shaft is long is carried out, It is possible to smoothly inject the lubricating material by avoiding inconvenience due to an increase in pipeline resistance due to a longer supply path of the lubricating material to be injected between the pipe and the ground.

First, the structure of the double pipe used in the present invention will be described with reference to FIG. Double tube A is inner tube 1 and outer tube 2
These tubes 1 and 2 are held by a bracket 3 provided between them, and are configured to be relatively slidable and rotatable in an axial direction and a circumferential direction. The inner pipe 1 and the outer pipe 2 are each formed of a steel pipe having a predetermined diameter and length.

Between the inner tube 1 and the outer tube 2, a plurality of supply tubes 4 (4a to 4c) for supplying a sliding material and a single sheath tube for moving by inserting a sliding material injection member 7 described later. 5 are arranged, and the respective tubes 4, 5 are fixed to the bracket 3.

A check valve 6 is provided at a predetermined position of the outer tube 2. The check valve 6 is selectively connected to the supply pipe 4 or the sheath pipe 5 depending on the position of the double pipe A in the pipeline, and the supplied sliding material is supplied between the double pipe A and the ground. It has a function of discharging and a function of preventing earth and sand or groundwater on the outer periphery of the double pipe A from entering the inside of the outer pipe 2.

The supply pipe 4 is formed to have a length shorter than the length of the inner pipe 1 and the outer pipe 2, and when connecting a new double pipe A to the double pipe A already propelled, , New double tube A
The supply pipes 4 are connected to each other by a socket (not shown) or connected to the check valve 6 by an elbow according to the position of the pipe B (order from the leading double pipe A).

The sheath pipe 5 is also formed to have a length substantially equal to that of the supply pipe 4, and when a new double pipe A is connected to the already propelled double pipe A, a new double pipe A Depending on the position of the pipe A in the pipe B, the sheath pipes 5 are connected to each other by a socket (not shown) or the sheath pipes 5 and the check valve 6 are connected by tees.

In this embodiment, the double pipe A is used for a gas supply line. For this reason, when connecting a new double pipe A to the double pipe A already propelled, the inner pipe 1 of the double pipe A already propelled and the inner pipe 1 of the new double pipe A are connected. The welded parts are welded all over the circumference and connected, and the welded parts are subjected to non-destructive inspection to confirm that there are no defects, and are sequentially promoted.

Next, the sheath 5 is inserted into the inside of the sheath 5
The configuration of the injection member 7 that moves inside will be described with reference to FIG. The injecting member 7 includes packers 7a and 7b each having a cylindrical member made of a flexible material (for example, rubber) disposed at both ends in the longitudinal direction, and a connecting member 7c that connects the packers 7a and 7b. A discharge member 7d formed on one packer 7a and connected to a hose 16 described later to discharge the supplied sliding material into the inside of the sheath tube 5, and a hook formed on the other packer 7b and connected to a wire 14 described later. 7
e.

In the injection member 7 configured as described above, the injection member 7 is moved to a position sandwiching the check valve 6 connected to the sheath tube 5 by the packers 7a and 7b, and when reaching the predetermined position, the packer 7a , 7b, the cylindrical member swells and presses against the inner surface of the sheath 5 to fix the injection member 7 and close the sheath 5. When the lubricating material is supplied in this state, the supplied lubricating material is discharged from the discharge member 7d to the sheath pipe 5 defined by the packers 7a and 7b, and injected from the check valve 6 between the double pipe A and the ground. Is done.

Next, a method for injecting a lubricant according to the present embodiment will be specifically described with reference to FIGS. In the figure,
A main pushing device 11 is installed in the starting shaft C, and a thrust wheel 11a provided in the main pushing device 11 is brought into contact with the outer tube 2 of the double tube A to apply thrust and is disposed at the head. By driving the cutter head 12a of the excavator 12, the excavator 12 and the double pipe A following the excavator 12 are propelled. And excavator
When 12 arrives at the arrival shaft D, a pipeline B of a plurality of double tubes A is laid between the start shaft C and the arrival shaft D.

The excavator 12 has a supply pipe 4 provided on a double pipe A.
Distribution device 1 provided with a number of valves 13a to 13c equal to the number of
3, and a winch 15 around which a wire 14 inserted into the sheath 5 and connected to the injection member 7 is provided.

The distribution device 13 is connected to a pump 17 for pumping a sliding material disposed in the starting shaft C through a tube or a hose 16 having a length substantially equal to that of the double tube A, and includes valves 13a to 13d.
It is connected to the supply pipes 4a to 4c of the double pipe A via 13c. As the valves 13a to 13c, it is possible to use a manual opening / closing valve or an automatic opening / closing valve which opens and closes by an electric signal. In particular, when the diameter of the inner pipe 1 is 800 mm or more, it is possible for a worker to enter the inside of the inner pipe 1 to open and close the valves 13a to 13c. In some cases, workers are prohibited from entering the inside by laws and regulations, and it is essential to use automatic on-off valves as the valves 13a to 13c.

Prior to the propulsion of the double pipe A, the excavator 12 is first propelled. This propulsion is performed by placing the excavator 12 on the main pushing device 11 and rotating the cutter head 12a to excavate the ground to apply thrust by the pushing wheel 11a. When the propulsion of the excavator 12 is completed, the push wheel 11a returns to the retracted position separated from the propelled excavator 12.

After the excavator 12 is propelled, a double pipe A located at the head of the pipeline B (located at the most arriving shaft D side) is arranged on the main pushing device 11, and Supply pipe 4a provided
4c and all of the valves 13a to 13c, connect the supply pipe 4a and the check valve 6, close the end of the supply pipe 4a with a plug, and connect the hose 16 to the distribution device 13 The distributor 13 and the pump 17 are connected. Also winch
The wire 14 wound around 15 is pulled out, inserted into the inside of the sheath tube 5, and the terminal is locked to the pressing wheel 11a.

When the preparation for propulsion of the double pipe A located at the head of the pipe B is completed as described above, the main pressing device 11 is driven to bring the pressing wheel 11a into contact with the outer pipe 2 of the double pipe A. By driving the cutter head 12a of the excavator 12 while applying thrust,
Promote double tube A. Pump 14 with the promotion of double pipe A
To feed the lubricating material and open the valve 13a. The pumped lubricating material is hose 16, dispenser 13, valve 13
a, supplied through the supply pipe 4a, and the check valve 6 of the double pipe A
Is injected between the double pipe A and the ground.

The lubricant injected between the double pipe A and the ground is
The antifriction effect is reduced by mixing in soil and groundwater. That is, the distance over which the lubricating material can maintain the anti-friction effect is about 60 m, although there are some differences depending on conditions such as the ground. For this reason,
In the present embodiment, the lubricating material can be injected from the double pipe A every 60 m with respect to the double pipe A located at the head of the pipe B.

Therefore, the pipeline B propelled as described above
Until the double pipe A following the double pipe A located at the beginning of the pipe reaches 60 m, the double pipe A is propelled as not having the function of injecting the lubricant. That is, after the leading double pipe A is propelled, a new double pipe A is disposed on the main pushing device 11, and the supply pipes 4b and 4c provided in the double pipe A and the already propelled double pipe A are provided. The supply pipes 4b and 4c of the pipe A are respectively connected by sockets or the like. The check valve 6 of the new double pipe A is not connected to any supply pipe, and is expected to have only a function of preventing intrusion of groundwater or the like. Further, the sheath tube 5 of the new double tube A is connected to the sheath tube 5 of the double tube A already propelled, and the wire 14 is inserted through the sheath tube 5.

As described above, the second and subsequent double pipes A are prepared for propulsion, and are sequentially propelled. And the top double tube A
When the double pipe A is propelled about 60 m from the above, the supply pipe 4b provided in the double pipe A and the supply pipe 4 of the double pipe A already propelled
b and the check valve 6, and further, the supply pipe 4
The end of b is closed by a plug. Further, the sheath 14 is connected to the sheath 5 of the double tube A which has already been propelled, and the wire 14 is inserted therethrough.

As the propulsion length of the double pipe A increases, the hose
The line resistance in the supply pipe 16 and the supply pipe 4 increases, and the load on the pump 17 increases. According to the knowledge of the present inventors, when the lubricating material is injected about every 60 m by the plurality of supply pipes 4,
The maximum pipe length of the supply pipe 4 (4c) is about 240 m. When the lubricant is to be injected from a portion longer than this length, the diameter of the supply pipe 4 is increased and the discharge pressure of the pump 17 is reduced. It was necessary to increase.

For this reason, in the present embodiment, when the propulsion distance of the double pipe A is about 300 m or more, the injection member 7 is inserted into the inside of the sheath 5 and the sliding material is supplied from the injection member 7. It is configured to obtain.

That is, when the propulsion length of the double pipe A becomes about 180 m, the supply pipe 4c arranged on the main pushing device 11 is connected to the supply pipe 4c of the double pipe A already propelled, and the connection is reversed. It is connected to the stop valve 6, the end of the supply pipe 4 c is closed by a plug, and the sheath pipe 5 is connected to the sheath pipe 5 of the double pipe A which has already been propelled, so that the wire 14 is inserted and propelled. . Then, when the propulsion length of the double pipe A reaches about 300 m, the sheath 5 of the double pipe A arranged on the main pushing device 11 is connected to the sheath 5 of the double pipe A already propelled through the tee. And the check valve 6 is connected.

Then, the injection member 7 connected via a pump 17 and a hose 18 is connected to the wire 14 inserted through the sheath tube 5, and the winch 15 is driven to wind up the wire 14 so that the injection member 7 is connected to the sheath tube. 5 and the main pushing device
11 to drive the pressing wheel 11a into contact with the outer pipe 2 of the new double pipe A to apply thrust, and
A new double pipe A is propelled by driving a.

With the above-mentioned propulsion, the winch 15 is driven to move the injection member 7 in the sheath tube 5 so as to face the tee connected to the check valve 6, where the winch 15 is stopped to stop the injection member. By supplying high-pressure gas to the packer 7, packers 7a,
The sheath 5 is closed by inflating 7b. Then the pump
When the lubricating material is pumped by driving the lubricating material 17, the lubricating material is supplied to the distributor 13 and the injection member 7 via the hoses 16 and 18.

The lubricant supplied to the distribution device 13 is supplied to the supply pipe 4a.
4c through the check valve 6 connected to the supply pipes 4a to 4c between the double pipe A and the ground.
Is supplied from the sheath 5 through the check valve 6 sandwiched between the packers 7a and 7b and injected between the double tube A and the ground.

When the propulsion length of the double pipe A further increases, a plurality of check valves 6 are connected to the sheath pipe 5 and the injection member 7 is moved as needed with the propulsion of the double pipe A. By selecting the check valve 6 and performing the same operation as described above, it is possible to inject lubricant from the selected check valve 6. By continuously performing this operation, it is possible to inject the sliding material from the plurality of check valves 6 between the double pipe A and the ground while propelling one double pipe A.

As described above, in this embodiment, when the propulsion length of the double pipe A increases, only the length of the hose 16 connecting the distributor 13 and the pump 17 increases with this increase. hose
Since 16 is arranged inside the inner tube 1 constituting the double tube A, the diameter is not limited. For this reason, hose 16
Can be set to a diameter sufficiently larger than the thickness of the supply pipe 4, and the increase in the pipe resistance with the increase in the length is greater than the increase in the pipe resistance in the supply pipe 4. small.

Therefore, even if the laying length of the pipeline B becomes long, the lubricant can be injected between the double pipe A and the ground without greatly increasing the capacity of the pump 17. As a result, the double pipe A can be smoothly propelled.

A pipe B is provided between the starting shaft C and the arriving shaft D.
After laying, the distribution device installed in the excavator 12 at the arrival shaft D
A distributing device having the same structure as that of the dispenser 13 is installed, and the dispensing device is connected to the backing material supply device.
Is connected to the backing material supply device, and by driving these supply devices, the check valve 6 connected to the supply pipes 4a to 4c and any one of the reverse valves connected to the sheath pipe 5 are connected. A backing material can be injected from the stop valve 6 to fill the gap formed between the double pipe A and the ground.

[0041]

As described above in detail, in the method for injecting a lubricating material according to the present invention, when laying a long-distance pipe line, the equipment between the double pipe and the ground is not greatly changed. The lubricant can be simultaneously injected from a plurality of double pipes. For this reason, it is characterized in that the frictional resistance between the double pipe and the ground, which is generated with the propulsion of the double pipe, can be reduced and a smooth propulsion operation can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view in a case where a laying distance of a pipeline is short and a lubricating material supplied from only a supply pipe is injected between a double pipe and ground.

FIG. 2 is a schematic explanatory view in a case where a laying distance of a pipeline is long and a lubricant supplied from a supply pipe and a lubricant supplied via a sheath pipe are simultaneously injected.

FIG. 3 is a diagram illustrating a configuration of a double pipe.

FIG. 4 is a diagram illustrating a configuration of an injection member.

[Explanation of symbols]

 Reference Signs List A Double tube B Pipe line C Starting shaft D Arriving shaft 1 Inner tube 2 Outer tube 3 Bracket 4, 4a-4c Supply tube 5 sheath tube 6 Check valve 7 Injection member 7a, 7b Packer 7c Connection member 7d Discharge member 7e Hook 11 Main pusher 11a Push wheel 12 Excavator 12a Cutter head 13 Distributor 13a ~ 13c Valve 14 Wire 15 Winch 16 Hose 17 Pump 18 Hose

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Koyama 5-14-10-310 Sagamigaoka, Zama City, Kanagawa Prefecture (72) Inventor Hideki Uno 1118-22, Wakamatsucho, Tokorozawa City, Saitama Prefecture (72) Inventor Tohru Sato 3-9-104 Nijigaoka housing complex 2-chome, Nishigaoka, Aso-ku, Kawasaki City, Kanagawa Prefecture (56) References JP-A-5-263586 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 311

Claims (1)

(57) [Claims] 1. A double pipe comprising an inner pipe and an outer pipe which follow an excavator disposed at the head and propelled by a main pushing device to lay the double pipe from a start shaft to an arrival shaft. A method for injecting a lubricating material in a propulsion method, wherein a double pipe provided with a sheath tube for supplying a lubricating material for injecting a lubricating material between an inner pipe and an outer pipe in advance. An excavator equipped with a winch around which a wire is wound and a lubricant distribution device having a valve corresponding to the number of supply pipes provided on the double pipe, and the double pipe is made to follow the excavator. While connecting the supply pipe of the heavy pipe and the distribution device and inserting the wire through the sheath and propelling it, the lubricant supplied through the supply pipe is injected between the double pipe and the ground, and the excavator When the extension distance of the double pipe that follows is reached to the specified value, injection is performed on the wire inserted through the sheath of the subsequent double pipe. The members are connected, and with the subsequent propulsion of the double pipe, the lubricating material supplied from the supply pipe is injected between the double pipe and the ground, and the injection member is moved inside the sheath pipe to obtain a desired material. A method for injecting a lubricating material in a double-pipe propulsion method, wherein a lubricating material is injected between a double pipe and a ground from a position.