JPH06257386A - Injection method for unguent in propulsion method for double tube - Google Patents

Abstract

PURPOSE:To facilitate an injection work of unguent between the outer circumferential face of a double tube and natural ground while propelling the double tube consisting of an inner tube and an outer tube. CONSTITUTION:A duct B laid by propelling a double tube A is previously divided into a plurality of sections having predetermined length. When an excavator 11 following the double tube A is propelled, a tube 3 provided in the double tube A is selected according to the section in response to the tube A and connected to the tube A, and the selected tube 3 and an unguent force feed pump 14 are connected together through a hose 13. Consequently, in the case of the double tube A in response to the section set close to a starting shaft (n) pieces of the tube 3 are connected to the pump 14. Accompanying propulsion of the double tube A, the pump 14 is driven, and the unguent is injected from all the tubes 3 connected to the pump 14. Hereby, it is unnecessary that an unguent injection member is moved in the double tube A so as to infect the unguent, and hence the work is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention promotes a double pipe consisting of an inner pipe and an outer pipe to lay a pipeline between a starting shaft and an arriving shaft. The present invention relates to an injection method for injecting a lubricant.

[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 continuous at 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 excavator and the pipe and the ground. Is being done.

A plurality of holes are formed at predetermined positions of the excavator and the pipe for carrying out the above construction method. The hole is connected to a lubricant supply device installed on the ground by a lubricant supply hose, and when propelling the pipe, the lubricant is supplied to the ground through the lubricant supply hose, the excavator or the hole of the pipe. Is injected during to reduce frictional resistance.

On the other hand, a pipe for supplying gas such as city gas and natural gas may be laid in the ground by adopting the propulsion method. In this case, it is general to previously lay a conduit consisting of a fume tube having an inner diameter sufficiently larger than the outer diameter of the gas supply pipe, and construct a conduit for supplying gas into the inside of this conduit. However, in this construction method, it is necessary to separately perform the step of laying the fume pipe and the step of constructing the gas supply pipe, which requires a construction period and therefore raises a problem that the laying cost is increased.

The present inventors have developed a method for solving the above problems. In this construction method, a double pipe in which an outer pipe is inserted into an inner pipe that serves as a gas supply pipe is followed by an excavator and propelled by an extruding device, so that a gas supply pipe line can be laid at once. I can.

[0006]

Generally, in a construction method in which an excavator is arranged at the head and a pipe such as a fume pipe or a steel pipe is followed by the excavator and a thrust is applied by an extruding device to propel the pipe. Because friction occurs between the outer peripheral surface of the pipe and the ground, a lubricant is injected into the gap formed between the outer peripheral surface of the pipe and the ground to promote friction while reducing the frictional resistance. .

The lubricant injected into the above-mentioned gap has a reduced effect when mixed with earth and sand or groundwater. That is, when the pipeline to be laid is long, if the lubricant is injected only from the leading excavator or pipe, the effect of the lubricant will be reduced at the site separated from the injection site of the lubricant by a certain distance behind. There is a problem that friction increases.

Therefore, in the above-mentioned construction method, during the laying of the pipeline, the lubricant injection member is inserted into the through hole formed between the inner pipe and the outer pipe so that the sliding member is slid at a desired position between the outer pipe and the ground. The material is being injected.
That is, a winch is provided in the excavator arranged at the head, and the wire wound around the winch is inserted into the through hole of the double pipe to be propelled in advance to connect to the lubricant injection member and the winch is operated to operate the wire. By winding and rewinding, the lubricant injection member is inserted into the through hole and moved in the desired direction, and the lubricant supplied from the lubricant supply device is injected between the outer peripheral surface of the double pipe and the ground. is doing.

As described above, when the lubricant injection member is connected to the wire inserted in the through hole and the lubricant is injected through the injection member while the double pipe is propelled, one double pipe is used. Each time, the lubricant injection member inserted in the already promoted double pipe is pulled out and removed from the wire.
After connecting the through hole when connecting the new double tube to the already promoted double tube, connect the lubricant injection member to the wire again and insert it into the through hole and move to the specified position. It is necessary to carry out the work. Therefore, there is a problem that the work of injecting the lubricant during the propulsion of the double pipe becomes complicated.

An object of the present invention is to propel a double pipe in which a lubricant can be easily injected between the outer peripheral surface of the double pipe and the ground when laying the double pipe consisting of an inner pipe and an outer pipe. It is intended to provide a method for injecting a lubricant in the construction method.

[0011]

In order to solve the above problems, a typical method for injecting a lubricant in a double pipe propulsion method according to the present invention is to use an inner pipe in an excavator installed at the top. A method of injecting a lubricant in a double-tube propulsion method of laying a double-tube consisting of an outer tube from a starting shaft to an arriving shaft by propelling the double-tube by a former pushing device. After the double pipe with the supply hole for supplying the lubricant between the inner pipe and the outer pipe and the discharge port for discharging the lubricant to the outside was formed following the excavator, New double pipe inner pipe is welded and connected to the heavy pipe inner pipe, and new double pipe feed hole is connected to the propelled double pipe feed hole. Connect the hole to the lubricant supply device, and then push the new double pipe with thrust by the former pusher to propel it, Driven by supplying lubricating material through the supply hole, it is characterized in that injected between the outer peripheral surface and the natural ground of the double pipe the supplied lubricant from the discharge port.

[0012]

According to the method of injecting a lubricant in the above-mentioned double pipe propulsion method (hereinafter referred to as "injection method"), when the double pipe is propelled, it is placed between the outer periphery of the double pipe and the ground. The work of injecting the lubricant can be easily performed.

That is, a supply hole for supplying a lubricant between the inner pipe and the outer pipe of the double pipe and a discharge port for discharging the lubricant between the outer periphery of the double pipe and the ground are formed in advance. When propelling the double pipe,
By connecting the supply hole to a lubricant supply device and driving the lubricant supply device in accordance with the propulsion of the double pipe, the lubricant is supplied to the outer periphery of the double pipe and the ground through the discharge hole and the discharge port. Can be injected in between.

Therefore, it is not necessary to insert and move the lubricant injection member into the through hole as in the prior art, and a wire, winch or the like for moving the lubricant injection member is unnecessary. Therefore, it is possible to easily perform the work of injecting the lubricant, which is accompanied by the propulsion of the double pipe.

[0015]

EXAMPLES The above injection method will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a state in which a pipeline to be laid is divided into sections having a predetermined length, and FIG. 2 is a diagram illustrating a state in which a double pipe corresponding to a section farthest from a starting shaft is propelled. 3 is a diagram for explaining a state of propelling a double pipe corresponding to a section continuous with the section, and FIG. 4 is a diagram for explaining a state of propelling a double tube corresponding to a further continuous section. The injection method according to the present invention employs a commonly practiced semi-shielding method to propel a double pipe consisting of an inner pipe and an outer pipe, and reliably and easily with the double pipe and the natural ground. A lubricant can be injected between them.

When propelling the double pipe A and laying the conduit B, the length by which the lubricant injected into the gap between the outer peripheral surface of the double pipe A and the natural ground can maintain the anti-friction effect is: Although it changes according to the nature of the ground, it is almost constant. Therefore, if a new lubricant is injected while the lubricant is maintaining the anti-friction effect, the friction resistance acting between the outer peripheral surface of the double pipe A and the ground is always reduced. It is possible to propel the heavy pipe A.

That is, the lubricant is injected from the first double pipe A connected to the excavator, and the length of the plurality of double pipes A following this double pipe A is reduced by the lubrication of the lubricant already injected. It is possible to maintain the anti-friction effect of the lubricant by newly injecting the lubricant from the double pipe A at a position equal to or shorter than the length capable of maintaining the effect.

Therefore, as shown in FIG. 1, the starting shaft C
The pipe B to be laid between the shaft and the arrival shaft D has a length equal to or shorter than the length by which the lubricant can maintain the anti-friction effect and is an integral multiple of the length of the double pipe A. It is divided into a plurality of sections L1 to Ln having a length equal to. In this embodiment,
The length of the section L is set to 60 m, and the number of double tubes A constituting one section is 10 at this time.

The double pipe A comprises an inner pipe 1 and an outer pipe 2, and a pipe 3 serving as a lubricant supply hole is provided between the pipes 1 and 2. The inner pipe 1 and the outer pipe 2 are each made of a steel pipe having a preset diameter. When connecting a new double pipe A to the already propelled double pipe A, the inner pipe 1 is welded over the entire circumference and the pipe 3 is connected via a joint 5.

A check valve 4 serving as a discharge port is provided at the end of the outer tube 2. The check valve 4 is connected to the pipe 3, discharges the lubricant supplied through the pipe 3 to the outside of the outer pipe 2 and injects the lubricant into the gap formed between the ground and the ground.
It has a function of preventing the earth and sand and the groundwater in the gap from entering the inside of the double pipe A.

In the double pipe A, the pipe 3 is previously fixed at a predetermined position between the inner pipe 1 and the outer pipe 2. Further, the number of pipes 3 to be provided at the same time as the production of the double pipe A is not particularly limited.

That is, when the number of sections L in the conduit B is set and the length of the double tube A is set, the number of double tubes A constituting each section L is determined. Therefore, the double pipe A corresponding to the section L1 which is the farthest section from the starting shaft
Is provided with one pipe 3, two pipes 3 are provided in the double pipe A corresponding to the section L2, and n pipes 3 are similarly provided in the double pipe A corresponding to the section Ln. Provided and manufactured,
Double pipe A corresponding to each section L when laying the pipeline B
It is possible to promote while selecting.

Further, n pipes 3 are provided in advance in the double pipe A according to the number n of divisions of the pipeline B, and when the double pipe A is propelled, a section L corresponding to the double pipe A is provided. The number of pipes 3 may be selected and connected according to (1 to n).

The procedure for propelling the double pipe A constructed as described above from the starting shaft C toward the arrival shaft D to lay the pipe B will be described with reference to FIGS. In the propulsion method, the excavator 11 is arranged at the head. Then, the excavator 11 uses the cutter head 11a to excavate the natural ground while pushing the original pushing device 12
The excavator 11 is propelled by applying a thrust force by.

After the excavator 11 is propelled, the leading double pipe A forming the conduit B is connected to the excavator 11 and propelled. This double pipe A corresponds to the section L1 farthest from the starting shaft C. Therefore, the check valve 4 provided in the double pipe A is connected to the pipe 3, and the pipe 14 is connected to the pump 14 for pumping the lubricant through the hose 13. The pump 14 is driven during propulsion to drive the hose. 13, the lubricant is injected between the outer peripheral surface of the double pipe A and the ground through the pipe 3 and the check valve 4. Due to this injection, the double pipe A is smoothly propelled with the frictional resistance reduced.

When the leading double pipe A is propelled, the push wheel 12a of the former pushing device 12 is retracted, and then the hose 13 connected to the pipe 3 of the leading double pipe A is removed. Then, the double pipe A to be connected second is arranged in the original pushing device 12, and the double pipe A
The pipe end of is brought into contact with the pipe end of the leading double pipe A to weld and join the inner pipe 1, and the pipe 3 is connected by the joint 5. Then, after connecting the hose 13 to the pipe 3 of the second double pipe A, the push ring 12a is brought into contact with the second double pipe A to propel it. At this time, the lubricant is injected only from the leading double pipe A. (See Figure 2)

As described above, the double tubes A corresponding to the section L1 are sequentially connected and propelled, and the length of the connected double tubes A becomes equal to the length of the section L1. When the propulsion of the double pipe A at the end is completed, the double pipe A placed on the original pushing device 12 is provided with the function as the double pipe A corresponding to the head of the section L2.

That is, the pipe 3 of the double pipe A corresponding to the rear end of the section L1 which has already been propelled and the pipe 3 of the double pipe corresponding to the head of the section L2 are connected and the pipe of the double pipe A is connected. 3 (3a) and the check valve 4 (4a) are connected. And after connecting the hoses 13 and 13a to the two pipes 3 and 3a,
The pump 14 is driven to supply the lubricant to the pipes 3 and 3a, and is propelled by the former pushing device 12. At this time, the lubricant is section L
The double pipe A corresponding to the beginning of 1 and the double pipe A corresponding to the beginning of the section L2 are simultaneously injected to reduce the frictional resistance between the outer peripheral surface of the double pipe A and the natural ground and smoothly promote the same. To be done.
(See Figure 3)

As described above, the section L1 to the section Ln-1
When the double pipe A corresponding to No. 2 is propelled and the propulsion of the double pipe A corresponding to the rear end of the section Ln-1 is completed, the former pushing device 12
In the double tube A placed on the section Ln, in the same manner as described above,
The function as the double tube A corresponding to the head of the is added.

That is, the pipe 3 of the double pipe A corresponding to the rear end of the section Ln-1 which has already been propelled, and the pipes 3 to 3n-1 which have already supplied the lubricant and the head of the section Ln. The pipes 3 to 3n-1 provided in the corresponding double pipes are connected, and the pipe 3 (3n) of the double pipe A and the check valve 4 (4
n) is connected. And hose to n pipes 3 to 3n
After connecting 13 to 13n, the pump 14 is driven and the lubricant is supplied to the pipes 3 to 3n while being propelled by the former pushing device 12.
At this time, the lubricant is simultaneously injected from the double pipes A corresponding to the heads of the sections L1 to Ln, and the frictional resistance between the outer peripheral surface of the double pipes A and the natural ground is reduced and the lubricant is smoothly propelled. (See Figure 4)

As described above, in this embodiment, when injecting the lubricant between the outer peripheral surface of the double pipe A and the ground, the hose 13 connected to the pump 14 and the pipe 3 provided in the double pipe A are used. And the pump 14 is driven in accordance with the propulsion of the double pipe A, so that the lubricant can be injected through the hose 13, the pipe 3 and the check valve 4. Therefore, the work for injecting the lubricant is facilitated, and the smooth propulsion work can be performed.

In the above embodiment, the double pipe A corresponding to the section L1 is provided with one pipe 3, and the double pipe A corresponding to the section Ln is provided with n pipes 3. The case of using the double tube A of the type has been described. However, n
It is also possible to lay the conduit B using the double pipe A provided with the book pipe 3. In this case, each section L1 to Ln-1
By covering the unnecessary pipe 3 (n-1 to 1) in the double pipe A corresponding to the above with the cap, the lubricant supplied to the subsequent section does not flow in and smoothly injects. It is possible to

[0033]

As described above in detail, in the method for injecting the lubricant in the double pipe propulsion method according to the present invention, the pipeline to be laid is divided into a plurality of sections having a predetermined length. , A supply hole for supplying a predetermined number of lubricants was provided inside the double pipes corresponding to each section, and the lubricant was injected from the leading double pipe corresponding to each section. The lubricant can be injected between the outer periphery of the double pipe and the ground by connecting the supply device to the supply hole.

Therefore, the wire is inserted into the through hole formed between the inner tube and the outer tube and the lubricant injecting member is inserted, and these are connected to wind the wire with a winch and rewind it for movement. Compared with the injection method, the work is easier, and the lubricant can be injected from a plurality of points at once, and the double pipe can be smoothly propelled. .

[Brief description of drawings]

FIG. 1 is a diagram illustrating a state in which a pipeline to be laid is divided into sections having a predetermined length.

FIG. 2 is a diagram illustrating a state in which a double pipe corresponding to a section farthest from a starting shaft is propelled.

FIG. 3 is a diagram illustrating a state in which a double pipe corresponding to a section continuous with the section is propelled.

FIG. 4 is a diagram illustrating a state in which a double pipe corresponding to a further continuous section is propelled.

[Explanation of symbols]

 A Double pipe B Pipe line C Starting shaft D Arrival shaft 1 Inner pipe 2 Outer pipe 3,3a, 3n Pipe 4, 4a, 4n Check valve 5 Joint 11 Excavator 11a Cutter head 12 Original pusher 13, 13a, 13n Hose 14 pump

 ─────────────────────────────────────────────────── ─── 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 (3)

[Claims] 1. A double pipe laid from a starting shaft to an arrival shaft by advancing a double pipe composed of an inner pipe and an outer pipe after the excavator arranged at the head and propelling the double pipe from a starting shaft. A method for injecting a lubricant in a pipe propulsion method, which is a double pipe in which a supply hole for supplying the lubricant is formed between an inner pipe and an outer pipe and a discharge port for discharging the lubricant to the outside is formed. After the excavator is propelled, the inner pipe of the new double pipe is welded and connected to the inner pipe of the already-propulsed double pipe, and the new feed pipe of the double pipe is newly installed. Double pipe supply hole is connected and new double pipe supply hole is connected to the lubricant supply device, and then thrust is applied to the new double pipe by the original pushing device to propel it while supplying the lubricant. Driving the device to supply the lubricant through the supply hole, and injecting the lubricant supplied from the discharge port between the outer peripheral surface of the double pipe and the ground. The method of injecting lubricant in the double pipe propulsion method. 2. A plurality of types of double pipes having different numbers of supply holes formed between the inner pipe and the outer pipe are prepared, and the pipe line to be laid is divided into sections having a predetermined length to start. A double pipe with the fewest supply holes is selected corresponding to the section farthest from the vertical shaft, and at least one is larger than the supply holes of the double pipe corresponding to the section adjacent to the starting vertical shaft side of the section. Select a double tube with a supply hole, and select a double tube with at least one more supply hole than the previous section as it approaches the starting shaft, and supply the selected double tube. 2. The method for injecting a lubricant in a double pipe propulsion method according to claim 1, wherein the method comprises propelling the excavator in order of the number of holes. 3. A double pipe having a plurality of supply holes formed between an inner pipe and an outer pipe is prepared, and a pipe line to be laid is divided into sections having a predetermined length, and the pipe is furthest from a starting shaft. When propelling the double pipe corresponding to the section,
The supply holes are selected to supply the lubricant, and when the double pipe corresponding to the section adjacent to the starting shaft side of the section is propelled, the supply holes already selected and at least one other supply Select the holes to supply the lubricant from a plurality of supply holes, and then supply the lubricant from the supply holes that are at least one more than the number of the supply holes used in the previous section as the starting shaft is approached. The method for injecting a lubricant in the double pipe propulsion method according to claim 1, which is characterized.