JP2937682B2 - 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 double pipe comprising an inner pipe and an outer pipe. The present invention relates to an injection method for injecting a lubricating material therebetween.

[0002]

2. Description of the Related Art When laying a sewer pipe or a water pipe, an excavator is disposed at the head, and a pipe such as a fume pipe or an iron pipe is continuously provided at the rear end of the excavator and propelled by a main pushing device. Propulsion method is adopted. In this construction method, in order to reduce the frictional resistance generated between the outer periphery of the excavator and the ground and between the outer periphery of the pipe and the ground, a sliding material is injected between the excavator and the pipe and the ground. That is being done.

A plurality of holes are formed at predetermined positions of an excavator and a pipe for performing the above-mentioned method. The hole is connected to a lubrication supply device installed on the ground by a lubrication supply hose, and when the pipe is propelled, the lubrication material is connected to the pipe via a lubrication supply hose, an excavator or a hole in the pipe. To reduce frictional resistance.

On the other hand, pipes for supplying gas such as city gas and natural gas by using a propulsion method may be laid underground. In this case, it is common practice to previously lay a pipe made of a fume pipe having an inner diameter sufficiently larger than the outer diameter of the gas supply pipe, and to construct a pipe for supplying gas inside the pipe. However, in this construction method, it is necessary to separately perform the step of laying the fume pipe and the step of constructing the pipe for supplying gas, which takes a construction period, and thus has a problem that the laying cost increases.

[0005] The present inventors have developed a construction method that solves the above problem. In this method, the gas supply pipe can be laid at a time by propelling the double pipe with the outer pipe inserted into the inner pipe that becomes the gas supply pipe and following the excavator with the main pushing device. I can do it.

[0006]

Generally, in a construction method in which an excavator is arranged at the head and a fume pipe or a steel pipe is made to follow the excavator and thrust is applied by a main pushing device to propel the excavator, Since friction occurs between the outer peripheral surface of the pipe and the ground, resistance is generated, and lubrication is injected into the gap formed between the outer peripheral surface of the pipe and the ground to reduce friction resistance and promote propulsion. .

[0007] The effectiveness of the lubricating material injected into the gap is reduced due to mixing with earth and sand or groundwater. In other words, when the pipeline to be laid is long, if the lubricating material is injected only from the leading excavator or the pipe, the effectiveness of the lubricating material decreases at a position separated from the injection site of the lubricating material by a certain distance or more behind. Therefore, there is a problem that friction increases.

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

As described above, when the lubricating material injection member is connected to the wire inserted into the through hole and the lubricating material is injected through the injecting member during the propulsion of the double pipe, one double pipe is used. Every time the propulsion is performed, pull out the slipping material injection member inserted into the already propelled double pipe and remove it from the wire,
After the connection of the new double pipe to the already propelled double pipe is completed, the lubrication injection member is connected to the wire again, inserted into the through hole, and moved to the predetermined position. It is necessary to perform the work to make it. For this reason, there is a problem that the operation of injecting the lubricant during the propulsion of the double pipe becomes complicated.

[0010] An object of the present invention is to promote a double pipe in which a sliding material can be easily injected between the outer peripheral surface of the double pipe and the ground when laying a double pipe composed of an inner pipe and an outer pipe. It is intended to provide a method for injecting a lubricating material in the construction method.

[0011]

In order to solve the above-mentioned problems, a typical method of injecting a sliding material in a double-pipe propulsion method according to the present invention is to provide an excavator provided at the head with an inner pipe. A method of injecting lubricating material in a double pipe propulsion method of laying the double pipe from a start shaft to an arrival shaft by propelling a double pipe consisting of an outer pipe and then propelling with a main pushing device, Prepare and lay a plurality of types of double pipes having different numbers of supply holes between the inner pipe and the outer pipe, and having a discharge valve with a check valve for discharging the lubricant to the outside formed in the outer pipe. Divide the pipeline to be divided into a plurality of sections having a length equal to or less than the length that the sliding material can maintain the anti-friction effect and having a length equal to an integral multiple of the double pipe, and the section furthest from the starting shaft A plurality of double pipes having the least supply holes are selected in accordance with the above, and a plurality of double pipes are selected corresponding to the section adjacent to the starting shaft side of the section. Selecting a double pipe having at least one more supply hole than the supply hole of the double pipe, and propelling the selected double pipe following the supply hole in ascending order of the supply hole, By driving the supply device, the sliding material is supplied to the discharge port of the double pipe corresponding to the beginning of each section through the supply hole, and the supplied lubricant is discharged from the discharge port to the outer peripheral surface of the double pipe and the ground. It is characterized by being injected during the period.

[0012]

According to the method of injecting a lubricating material in the above double pipe propulsion method (hereinafter referred to as "injection method"), when the double pipe is propelled, the space between the outer periphery of the double pipe and the ground is lowered. The operation of injecting the lubricating material 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,
The supply hole is connected to a lubrication supply device, and the lubrication supply device is driven as the double pipe is propelled, so that the lubrication material is supplied to the outer periphery of the double pipe and the ground through the supply hole and the discharge port. Can be injected in between.

Therefore, it is not necessary to insert the sliding material injection member into the through hole and move the sliding material injection member as in the prior art, and it is not necessary to use a wire, a winch or the like for moving the sliding material injection member. Therefore, the operation of injecting the lubricating material accompanying the propulsion of the double pipe can be easily performed.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 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 illustrating a state in which a double pipe corresponding to a section continuous with the section is propelled, and FIG. 4 is a diagram illustrating a state in which a double pipe corresponding to a section further continuous is propelled. The injection method according to the present invention employs a semi-shielding method that is usually carried out, when propelling a double pipe composed of an inner pipe and an outer pipe, reliably and easily with a double pipe and ground. The lubricating material can be injected between them.

When the double pipe A is propelled and the pipe B is laid, the length of the lubricating material injected into the gap between the outer peripheral surface of the double pipe A and the ground can maintain the antifriction effect. Although it changes according to the nature of the ground, it is almost constant. Therefore, if new lubricating material is injected while the lubricating material maintains the anti-friction effect, the frictional force acting between the outer peripheral surface of the double pipe A and the ground is always reduced while the lubricating effect is reduced. Heavy pipe A can be propelled.

That is, lubricating material is injected from the leading double pipe A connected to the excavator, and the length of a plurality of double pipes A following the double pipe A is reduced by friction of the already injected slipping material. It is possible to maintain the lubrication 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 effectiveness.

For this reason, as shown in FIG.
And the pipeline B to be laid, which is set between the arrival shaft D and the arrival shaft D, has a length equal to or shorter than the length in which the sliding material can maintain the anti-friction effect, and is an integral multiple of the length of the double pipe A. 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. At this time, the number of the double tubes A constituting one section is ten.

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 formed of a steel pipe having a predetermined diameter. When connecting a new double pipe A to a double pipe A that has already been propelled, 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 an end of the outer tube 2. The check valve 4 is connected to the pipe 3 and discharges the lubricating material supplied through the pipe 3 to the outside of the outer pipe 2 and injects it into a gap formed between the outer pipe 2 and the ground.
It has a function of preventing earth and sand or groundwater in the gap from entering the inside of the double pipe A.

In the double pipe A, the pipe 3 is fixed at a predetermined position between the inner pipe 1 and the outer pipe 2 in advance. Further, the number of pipes 3 to be provided simultaneously with the production of the double pipe A in advance is not particularly limited.

That is, when the number of sections L in the pipeline B is set and the length of the double pipe A is set, the number of double pipes A constituting each section L is determined. Therefore, the double pipe A corresponding to the section L1 which is the section farthest 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. Installed and manufactured,
When laying pipe B, double pipe A corresponding to each section L
It is possible to promote while selecting.

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

The procedure for laying the pipeline B by propelling the double pipe A constructed as described above from the start shaft C toward the arrival shaft D will be described with reference to FIGS. In the propulsion method, an excavator 11 is provided at the head. Then, while excavating the ground with the cutter head 11a of the excavator 11,
The excavator 11 is propelled by applying a thrust.

After the excavator 11 is propelled, the leading double pipe A constituting the pipeline B is connected to the excavator 11 and propelled. The double pipe A corresponds to the section L1 farthest from the starting shaft C. For this purpose, the check valve 4 provided in the double pipe A is connected to the pipe 3, and the pipe 3 is connected to the pump 14 for feeding the lubricating material via the hose 13, and the pump 14 is driven during the propulsion to drive the hose. 13. The lubricating material is injected between the outer peripheral surface of the double pipe A and the ground through the pipe 3, the check valve 4 and the check valve 4. By this injection, the double pipe A is smoothly propelled with the frictional resistance reduced.

When the leading double tube A is propelled, the pressing ring 12a of the original pushing device 12 is retracted, and then the hose 13 connected to the pipe 3 of the leading double tube A is removed. Then, a double pipe A connected secondly to the main pushing device 12 is arranged,
And the inner pipe 1 is welded and joined, 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 and propelled. At this time, the lubricating material is injected only from the leading double pipe A. (See Fig. 2)

As described above, the double pipes A corresponding to the section L1 are sequentially connected and propelled, and the length of the connected double pipes A becomes equal to the length of the section L1. When the propulsion of the double tube A at the end is completed, the double tube A mounted on the main pushing device 12 is given the function as the double tube 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 that has already been propelled is connected to the pipe 3 of the double pipe A corresponding to the head of the section L2. 3 (3a) and check valve 4 (4a) are connected. Then, after connecting the hoses 13 and 13a to the two pipes 3 and 3a,
The pump 14 is driven so that the lubricating material is supplied to the pipes 3 and 3a while being propelled by the main pushing device 12. At this time, the sliding material is section L
1 and the double pipe A corresponding to the head of the section L2 are simultaneously injected, and the frictional resistance between the outer peripheral surface of the double pipe A and the ground is reduced to promote smooth propulsion. Is done.
(See Fig. 3)

As described above, the sections L1 to Ln-1
Is pushed, and when the pushing of the double pipe A corresponding to the rear end of the section Ln-1 ends, the main pushing device 12
Is placed in the section Ln in the same manner as described above.
A function as a double tube A corresponding to the head of the above is provided.

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 lubricating material and the top of the section Ln. The pipes 3 to 3n-1 provided in the corresponding double pipe are connected, and the pipe 3 (3n) of the double pipe A and the check valve 4 (4
n). And hoses on n pipes 3-3n
After connecting 13 to 13n, the pump 14 is driven and the lubricating material is supplied to the pipes 3 to 3n while being propelled by the main pushing device 12.
At this time, the lubricating material is simultaneously injected from the double pipe A corresponding to the head of each section L1 to Ln, and is smoothly propelled by reducing the frictional resistance between the outer peripheral surface of the double pipe A and the ground. (See Fig. 4)

As described above, in this embodiment, when the lubricant is injected 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. By driving the pump 14 with the propulsion of the double pipe A, it is possible to inject the lubricant through the hose 13, the pipe 3, and the check valve 4. For this reason, the operation at the time of injecting the lubricating material becomes easy, and the smooth propulsion operation 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 where two types of double tubes A are used has been described. But beforehand n
It is also possible to lay the pipeline B using the double pipe A provided with the pipes 3. In this case, each section L1 to Ln-1
Unnecessary pipes 3 (n-1 to 1) in the double pipe A corresponding to the above are covered with a cap, so that the lubricating material supplied to the subsequent section does not flow in smoothly, but is injected smoothly. It is possible to

[0033]

As described above in detail, in the method of injecting a sliding material in the double pipe propulsion method according to the present invention, the pipe line to be laid is divided into a plurality of sections having a predetermined length. Since a supply hole for supplying a predetermined number of lubricating materials is provided inside the double pipe corresponding to each section, the lubricating material is injected from the leading double pipe corresponding to each section. By connecting the supply hole and the supply hole, the lubricant can be injected between the outer periphery of the double pipe and the ground.

Accordingly, the wire is inserted into the through hole formed between the inner tube and the outer tube, and the lubricating material injection member is inserted. These members are connected, and the wire is moved up and down by a winch. Work is easier than in the method of injecting, and it is possible to inject the lubricating material from a plurality of places at once, and it is possible to smoothly carry out the propulsion of the double pipe. .

[Brief description of 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.

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]

 Reference Signs List A Double pipe B Pipe C Starting shaft D Arriving shaft 1 Inner tube 2 Outer tube 3, 3a, 3n Pipe 4, 4a, 4n Check valve 5 Joint 11 Excavator 11a Cutter head 12 Main pushing device 13, 13a, 13n Hose 14 pump

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Kozoyama 5-14-10-310 Sagamigaoka, Zama City, Kanagawa Prefecture (72) Inventor Hideki Uno 1118-22, Wakamatsucho, Tokorozawa City, Saitama Prefecture (56) References JP JP-A-1-90396 (JP, A) JP-A-2-17284 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 311

Claims (2)

(57) [Claims] 1. A double pipe comprising an inner pipe and an outer pipe followed by an excavator arranged at the head and propelled by a main pushing device, whereby the double pipe is laid from a start shaft to an arrival shaft. A method for injecting a lubricating material in a pipe propulsion method, comprising a different number of supply holes between an inner pipe and an outer pipe, and a discharge port with a check valve for discharging the lubricating material to the outside. A plurality of types of double pipes are prepared, and the length of the pipe to be laid is equal to or less than the length that the lubricating material can maintain the anti-friction effect and equal to an integral multiple of the double pipe. Is divided into a plurality of sections having a plurality of sections, a plurality of double pipes having the least supply holes are selected in correspondence with the section farthest from the starting shaft, and in correspondence with the section adjacent to the starting shaft side of the section. Selecting a plurality of double tubes having at least one more supply hole than the supply holes of the double tube; While driving the lubricating material supply device to drive the lubricating material supply device to supply the lubricating material to the discharge port of the double pipe corresponding to the head of each section through the supply hole, A method for injecting a lubricating material in a double pipe propulsion method, comprising injecting a material from a discharge port between an outer peripheral surface of the double pipe and a ground. 2. A double pipe comprising an inner pipe and an outer pipe followed by an excavator arranged at the head and propelled by a main pushing device, whereby the double pipe is laid from a start shaft to an arrival shaft. A method of injecting a lubricating material in a pipe propulsion method, comprising a plurality of supply holes between an inner pipe and an outer pipe, and a discharge port with a check valve for discharging the lubricating material to the outside is provided on the outer pipe. Prepare the formed double pipe and set the pipe line to be laid to have a length equal to or less than the length that the lubricating material can maintain the anti-friction effect and having a length equal to an integral multiple of the length of the double pipe. When a double pipe corresponding to a section farthest from the starting shaft is propelled, a single supply hole formed in the double pipe is selected to supply a sliding material, When propelling the double pipe corresponding to the section furthest from the starting shaft and the double pipe corresponding to the section adjacent to the starting shaft side of the section, the The selected supply hole and at least one other supply hole are selected to supply the lubricating material from the plurality of supply holes. The lubricating material is supplied from many supply holes, the lubricating material is supplied to the discharge port of the double pipe corresponding to the head of each section through the supply hole, and the supplied lubricating material is supplied from the discharge port to the outer periphery of the double pipe. A method for injecting a lubricating material in a double pipe propulsion method characterized by injecting between a surface and a ground.