JP2000310097A - Construction method of underground pipeline and underground pipeline constructing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain construction of safery and high efficiency by providing a film cartridge arranged in front of an underground pipe and diliverably receiving a film covering the outside of the underground pipe, and a lubricant injection means injecting lubricant into a gap between the film and the underground pipe. SOLUTION: A lubricant injection pump 17 is operated to inject lubricant into the gap between a film covering the outside of an underground pipe 3a and the underground pipe 3a, and inject from the front and the rear of the underground pipe 3a through a primary injection pipe 14 and a secondary injection pipe 15. At this time, to an underground pipe sent from a shaft 7, lubricant is supplied immediately and continuously, and the gap between the underground pipe 3 and the film 4 is filled with lubricant to form a lubricant layer. In this case, after the hydraulic cylinders 8 of a press-in device 2 are sufficiently extended, the cylinders 8 are again retreated, a next underground pipe 3b is set in the press-in device 2, and joined to the rear end of the underground pipe 3a. Hereafter, the underground pipe 3 is propelled by the press-in device 2 while joining together, and after completing the work, an opening/ closing valve is closed to backfill a groove hole. Hereby, the lubricant layer is completly sealed to prevent the lubricant from leaking to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for constructing a pipeline in the ground.

[0002]

2. Description of the Related Art When laying communication cables and the like underground,
Underground pipes are constructed underground and laid through communication cables and the like in the underground pipes.

[0003] As a method of constructing a pipe of an underground pipe underground, there is a non-cutting press-fitting method in which an underground pipe is pressed from a shaft and press-fitted, or an underground pipe is cut in the ground and the underground pipe is arranged in the slot. And open cutting methods that connect to each other.

As shown in FIG. 9, a pipeline construction by a non-cutting press-fitting method is performed by digging a shaft 40 for starting an underground pipe in the ground and a shaft 41 for reaching an underground pipe. Is provided with a main press-fitting device 42, and the leading conductor 43 is press-fitted into the ground by the main press-fitting device 42, an underground pipe 44 is connected thereto, and the underground pipe 44 is pressed into the ground and added. The operation is repeated so that the underground pipe 44 reaches the vertical shaft 41 on the arrival side.

Although it is difficult to avoid sharp curves and obstacles in this pipeline construction method, since all operations such as connection of the underground pipe 44 are performed in the shaft 40, the method is highly safe. The feature is that the above construction can be minimized.

[0006] On the other hand, the open cut method has a feature that a pipeline can be freely constructed and a sharp curve or an obstacle can be easily avoided.

For this reason, in general, a pipeline is constructed by a non-cutting press-fitting method on a straight line or a gentle curve without obstacles, and a conduit is constructed by an open-cutting method on a place where there is an obstacle or on a sharp curve.

By the way, in recent years, there is a tendency that a pipeline is provided at a deep position in preparation for an earthquake disaster or the like, and in an open-cutting method, there is a case where a connection work or the like must be performed in a deep slot.

[0009] In this case, the work is performed while securing the safety of the worker by securing the soil with a sheet pile or the like, but the work in the deep slot is dangerous, and furthermore, the slot is formed in order to secure the working space. There was a problem that the work had to be sufficiently wide-cut and the working efficiency was poor.

In recent years, in order to solve such a problem, a new underground pipeline construction system has been proposed and is being studied for realization.

The new pipeline construction method is to form a shaft, cut a slot for passing an underground pipe, and push the underground pipe from the shaft into the slot.

When this pipeline construction method (hereinafter, referred to as an excavation main pushing method) is realized, it is not necessary for an operator to enter a slot, and it is not necessary to excavate a work space. Can be built.

[0013]

By the way, the underground pipe has a maximum length of 200 m per section, and the slot cut on the road must be refilled every day for safety. For this reason, when actually performing the construction by the excavation main pushing method, it is necessary to dig the front of the underground pipe by a length that can be propelled on the day, and to backfill the underground pipe after propelling the underground pipe.

In general, in the non-drilling press-fitting method, the underground pipe is propelled while spraying a sliding material from a leading conductor connected to the tip of the underground pipe. To promote the middle part in the soil,
There is a problem that the lubricating material cannot be supplied around the underground pipe, the resistance of the soil cannot be released, and the underground pipe cannot be propelled by 200 m.

[0015] Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a lubricating material around an underground pipe buried in a slot, so that it is safe even in a place where there is an obstacle or a sharp curve. It is an object of the present invention to provide a method and apparatus for constructing an underground pipeline capable of efficiently constructing an underground pipeline.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method for constructing an underground pipeline in which an underground pipe is propelled while adding the underground pipe at a predetermined position such as a shaft. The sliding material is injected into the gap between the underground pipe and the membrane while covering the outside of the underground pipe with the membrane.

Further, an underground pipeline construction apparatus for propelling an underground pipe while adding the underground pipe at a predetermined position such as a shaft, which is disposed in front of the underground pipe to cover the outer periphery of the underground pipe. It is preferable to include a film material cartridge for accommodating the film material so as to be able to be fed out, and a lubricating material injection means for injecting a lubricating material into a gap between the film material fed from the film material cartridge and the underground pipe.

The membrane material cartridge comprises a core for folding and inserting the membrane in a bellows shape, and an outer shell for covering the core together with the membrane. The membrane is provided at the rear of the outer shell. It is preferable that a payout opening for paying out is formed.

Further, it is preferable that the above-mentioned film material covering the outside of the underground pipe has a lubricating layer having a predetermined thickness formed on an inner surface thereof in advance.

Preferably, the film material is formed in a tubular shape so as to sequentially cover the outer portion of the underground pipe to be refilled, and a lubricating layer is previously formed on the inner surface.

Further, the above-mentioned membrane material is formed in a tubular shape so as to sequentially cover the outer portion of the underground pipe to be refilled, and also allows an inflow of a sliding material between the underground pipe and the inner surface of the underground pipe. It is preferable to have the gap forming member.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, an underground pipeline construction apparatus 1
Is a main press-fitting device 2 provided in a shaft 7, and a film material 4 disposed in front of the underground pipe 3 to cover the outer periphery of the underground pipe 3.
And a lubricating material injection means 6 for injecting lubricating material into the gap between the film material 4 fed from the film material cartridge 5 and the underground pipe 3.

The main push-fitting device 2 has a hydraulic cylinder 8 for pushing the underground pipe 3 in a horizontal direction, and is firmly fixed in a shaft 7. The underground pipes 3 are configured to be connected to each other in a socket shape, and are bent by play of the connection portion.

The membrane material cartridge 5 is formed to have substantially the same length as the underground pipe 3 and has a core 9 through which the membrane 4 is folded and inserted in a bellows shape, and an outer covering the core 9 together with the membrane 4. And a shell 10. At the rear part of the outer shell part 10, an outlet 11 for feeding out the film material 4 is formed.

The core portion 9 is formed of a metal into a small-diameter cylindrical shape, and has a cap portion (not shown) at the rear end for attaching to the tip of the underground pipe 3. The cap part is
The underground pipe 3 is attached to the tip of the underground pipe 3 freely and removably.

The outer shell 10 comprises a disk-shaped tip protection portion 12 which is detachably attached to the tip of the core portion 9, and an outer periphery protection portion 13 formed to extend rearward from the outer periphery of the tip protection portion 12. Become.

The tip protection portion 12 and the outer periphery protection portion 13 are each made of metal and are robustly formed so that they are not deformed by earth pressure even when buried in the soil. The feeding port 11 is formed in an annular shape on the rear end side of the core 9 by forming the outer shell 10 shorter than the core 9, so that the film material 4 can be fed without delay.

The core portion 9 and the outer shell portion 10 are formed so as to be sufficiently separated in the radial direction so that one section of the film material 4 can be folded in a bellows shape.

The membrane material 4 is formed in a cylindrical shape long enough to sequentially cover the outer portion of the underground pipe to be added and cover at least one section of the underground pipe 3. A lubricating layer 23 having a predetermined thickness is formed on the inner surface of the membrane 4 before the underground pipe 3 is propelled.

The film material 4 is fixed with one end sandwiched between the core 9 and the tip protection portion 12. The other end of the film material 4
It comes out of the membrane material cartridge 5 from the feeding port 11 and extends rearward outside the underground pipe 3 and is fixed to the shaft 7 side.

The film material 4 is formed of a thick polyvinyl chloride or polyethylene terephthalate having a thickness of about 0.55 mm, and has sufficient strength such as tensile strength, elongation and tear strength. I have.

The sliding material injection means 6 includes a primary injection pipe 14 for injecting the sliding material backward from the underground pipe 3 at the tip and a secondary injection pipe 14 for injecting the sliding material from the shaft 7 toward the front. Next injection pipe 15 and wellhead packing 16 for fixing the rear end of membrane 4 near shaft 7 and sealing between membrane 4 and underground pipe 3
And a lubricant injection pump 17 that sends the lubricant to the primary injection pipe 14 and the secondary injection pipe 15.

The primary injection pipe 14 is provided so as to extend inside the underground pipe 3 from the inside of the shaft 7 to the front, and is connected to the underground pipe 3a positioned at the head so as to open the tip at the outer peripheral upper end. Have been. The primary injection pipe 14 is a flexible pipe such as a rubber hose, and can be freely pulled out from a reel (not shown) in accordance with the propulsion of the underground pipe 3.

The secondary injection pipe 15 has a tip at the wellhead packing 1.
6 and penetrates into the wellhead packing 16 from above, and is connected to the gap between the membrane material 4 and the underground pipe 3. Each of the primary injection pipe 14 and the secondary injection pipe 15 has an on-off valve 18.
The on-off valve 18 is closed to prevent the backflow of the sliding material.

The wellhead packing 16 seals the outer circumference of the underground pipe 3 in a ring shape, and prevents the slipping material injected into the gap between the membrane material 4 and the underground pipe 3 from leaking into the shaft 7. ing.

Next, the operation will be described.

When constructing an underground conduit between the shafts 7, 7,
As shown in FIG. 6A, the main press-fitting device 2 is installed in one of the shafts 7, and a slot 19 extending from the shaft 7 to the other shaft 7 is cut out. The slot 19 is
And at a width that allows the underground pipe 3 to pass through.

A wellhead packing 16 is attached to the shaft 7 at a position facing the slot 19, and the secondary injection pipe 15 is attached to the wellhead packing 16.
To the inside of the seal. And slot 1
A guide 21 for guiding the underground pipe 3 is suspended and provided in the pipe 9.

The membrane material cartridge 5 is set in the original press-fitting device 2, the rear end of the membrane material 4 is pulled out from the feed port 11 of the membrane material cartridge 5, and fixed to the wellhead packing 16.

Thereafter, the main press-fitting device 2 is operated to push the membrane material cartridge 5 toward the slot 19. The membrane material cartridge 5 is propelled into the slot 19 through the wellhead packing 16 while being guided by the guide 21 provided in the slot 19.

When the hydraulic cylinder 8 of the main press-fitting device 2 is completely extended, the hydraulic cylinder 8 is retracted again, the leading underground pipe 3a is set in the main press-fitting device 2, and the underground pipe 3a is set.
Is connected to the rear end of the membrane material cartridge 5.

As shown in FIG. 1, a screw hole 22 for discharging the lubricant is formed in advance near the tip of the leading underground pipe 3a, and the tip of the primary injection pipe 14 is inserted into the screw hole 22. Connecting.

Then, the primary injection pipe 14 is sent out while the hydraulic cylinder 8 of the main press-fitting device 2 is extended, and the underground pipe 3 and the membrane cartridge 5 connected to the front of the underground pipe 3 are pushed out. The film material cartridge 5 is propelled on a predetermined path along the guide 21 while feeding out the film material 4 from the feeding port 11.

When the membrane material cartridge 5 is separated from the wellhead packing 16, the underground pipe 3 a is inserted into the wellhead packing 16 following the membrane material cartridge 5 and propelled into the slot 19. At this time, the underground pipe 3a enters a state inside the film material 4 fed from the film material cartridge 5.

The lubricant injection pump 17 is operated to inject lubricant into the gap between the membrane material 4 covering the outside of the underground pipe 3a and the underground pipe 3a. The lubricating material is injected from before and after the underground pipe 3a via the primary injection pipe 14 and the secondary injection pipe 15.

The lubricating material injected from the primary injection pipe 14 flows backward along the outer circumference of the underground pipe 3 while flowing downward. The sliding material injected from the secondary injection pipe 15 hangs from above on the underground pipe 3 sent from the shaft 7. Therefore, the lubricating material can be supplied to the underground pipe 3 sent from the shaft 7 immediately and evenly.

Then, the gap between the underground pipe 3 and the membrane 4 is filled with a lubricant, and as shown in FIGS.
3 is formed. Since the lubricating layer 23 is formed in a space closed between the membrane material cartridge 5 and the wellhead packing 16 at the front and rear, the lubricating material does not leak outside.

When the hydraulic cylinder 8 of the main press-fitting device 2 is fully extended, the hydraulic cylinder 8 is retracted again and the next underground pipe 3
b is set in the main press-fitting device 2, and connected to the rear end of the underground pipe 3a which has already been pushed into the slot 19, and added. And
The hydraulic cylinder 8 is extended and propelled while supplying the lubricant through the primary injection pipe 14 and the secondary injection pipe 15.

In the same manner, the underground pipe 3 is pushed forward by the main press-fitting device 2 while the underground pipe 3 is being added, and the underground pipe 3 is propelled.

The membrane cartridge 5 is propelled to the end of the slot 19, and when one day of pipeline construction work is completed, the on-off valve 1
7 is closed, and the slot 19 is filled back as shown in FIG. When the on-off valve 17 is closed, the lubricating material layer 23 is completely closed, and the lubricating material does not leak out.

When the work is continued at a later date, FIG.
As shown in FIGS. 5 and 6C, the membrane material cartridge 5
The slot 20 is cut forward in the propulsion direction, and a guide 21 is suspended and provided in the slot 20. Then, the on-off valve 17 is opened, and the underground pipe 3 is pushed forward by the main press-fitting device 2 while the underground pipe 3 is added in the above-described procedure, and propelled.

At this time, the underground pipe 3 in the vicinity of the shaft 7 is in the backfilled soil and is subjected to earth pressure, but a lubricating layer 23 is formed outside the underground pipe 3 and the membrane material 4 Since there is no friction between them, the original pressing can be easily performed.

Then, as shown in FIGS. 3 and 6 (d) (e), the same operation is repeated for several days, and when the membrane material cartridge 5 reaches the vertical shaft 7 as the destination, the membrane material 4 is removed. It is removed from the cartridge 5, the end of the membrane material 4 is closed, and the membrane material cartridge 5 is lifted and collected.

As described above, while the outside of the underground pipe 3 to be propelled is covered with the film material 4 and the lubricant is injected into the gap between the film material 4 and the underground pipe 3, the lubrication material is buried in the slot 20. The lubricating material can be supplied around the underground pipe 3, and the lubricating layer 23 can be always formed around the underground pipe 3 regardless of the construction method, and the underground pipe 3 can be easily propelled. Can be done. Then, the amount of the sliding material used can be reduced by preventing the sliding material from scattering into the ground.

The underground pipeline construction apparatus 1 is provided with a membrane cartridge 5 which is connected to the tip of the underground pipe 3 to be propelled and which accommodates the membrane material 4 for covering the outer periphery of the underground pipe 3 so as to be able to be fed out.
And a lubricating material injection means 6 for injecting lubricating material into a gap between the film material 4 fed from the film material cartridge 5 and the underground pipe 3. The pipe 3 can be easily covered with the film material 4, and the film material layer 23 can be easily formed in the gap between the film material 4 and the underground pipe 3.

Then, the core member 9 through which the membrane material cartridge 5 is folded and folded in a bellows shape, and the core member 9 together with the membrane material 4 are inserted.
And the outer shell portion 10 covering the outer surface of the outer shell portion 10. Since the feed port 11 for feeding the film material 4 is formed at the rear portion of the outer shell portion 10, the film material 4 can be stored in a simple structure so as to be able to be fed out.

As shown in FIG. 7, the film material 4 may have a gap forming member 30 on its inner surface for permitting the lubricant to flow into the underground pipe 3.

The gap forming member 30 is preferably composed of a plurality of protrusions 30 projecting from the inner surface 33 of the film material 4 in the inner diameter direction. The projections 30 are preferably arranged in a staggered manner so that the projections 30 do not hit each other when the film material 4 is folded in a bellows shape.

As a result, the underground pipe 3 can be supported on the projection 30, the lubricating layer 23 can be formed quickly without any delay, and the friction between the membrane 4 and the underground pipe 3 is further reduced. be able to.

As shown in FIG. 8, a spiral spiral projection 31 may be formed in place of the projection 30.

The lubricating cartridge 5 may be longer than the underground pipe 3 as long as it can be bent freely. In this case, it may be formed so as to be bent at the same interval as the length of the underground pipe 3 or at a shorter interval than the underground pipe 3.

In the above-described embodiment, the guide 21 for guiding the underground pipe is buried together with the underground pipe. However, the present invention is not limited to this. The guide 21 may be lifted and collected from above.

[0064]

In summary, according to the present invention, the following excellent effects can be obtained.

(1) A lubricant can be supplied around the underground pipe buried in the slot.

(2) A film material layer can be formed around the underground pipe.

(3) The lubricant can be prevented from scattering into the ground.

[Brief description of the drawings]

FIG. 1 is a side view of an underground pipeline construction apparatus showing a preferred embodiment of the present invention.

FIG. 2 is a side view of the underground pipeline construction device in a state where the underground pipe is being propelled from the state of FIG.

FIG. 3 is a side view of the underground pipeline construction device in a state where the underground pipe of FIG. 2 is backfilled.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a plan view of FIG. 2;

FIG. 6 is an explanatory diagram of an underground pipeline construction method.

FIG. 7 is a side sectional view of a film material according to another embodiment.

FIG. 8 is a side sectional view of a film material showing another embodiment.

FIG. 9 is an explanatory view of a conventional underground pipeline construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground pipeline construction apparatus 3 Underground pipe 4 Membrane material 5 Membrane material cartridge 6 Lubricant injection means 7 Vertical shaft 9 Core part 10 Outer shell part 11 Feeding port

Claims (6)

[Claims] In an underground pipeline construction method for propelling an underground pipe while adding the underground pipe at a predetermined position such as a shaft, a method for covering the outside of the underground pipe to be propelled with a membrane material and covering the outside of the underground pipe with a membrane material. A method of constructing an underground pipeline, wherein a lubricating material is injected into a gap between the underground pipeline. 2. An underground pipeline construction apparatus for propelling an underground pipe while adding the underground pipe at a predetermined position such as a shaft, wherein the apparatus is disposed in front of the underground pipe to cover an outer periphery of the underground pipe. An underground comprising: a membrane material cartridge for accommodating a membrane material so as to be able to be fed out; and a lubrication material injecting means for injecting a lubrication material into a gap between the membrane material fed from the membrane material cartridge and an underground pipe. Pipeline construction equipment. 3. The film material cartridge comprises a core portion through which the film material is folded in a bellows shape and inserted, and an outer shell portion covering the core portion together with the film material. The underground pipeline construction device according to claim 2, wherein a payout opening for paying out is formed. 4. A membrane material for an underground pipe, wherein the membrane material covering the outside of the underground pipe has a slip layer having a predetermined thickness formed on an inner surface thereof in advance. 5. A membrane material for an underground pipe, wherein the membrane material is formed in a tubular shape so as to sequentially cover the outer portion of the underground pipe to be refilled, and a lubricating layer is previously formed on an inner surface thereof. 6. The above-mentioned membrane material is formed in a tubular shape so as to sequentially cover the outer portion of the underground pipe to be refilled, and also allows a slipping material to flow between the underground pipe and the inner surface of the underground pipe. Membrane material for underground pipes having a gap forming member.