JPH1163299A - Execution method of multi-conduit pipe and multi-conduit pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct execution work for laying a cable under the ground easily and promptly. SOLUTION: With a shield machine placed at the head, propulsion pipes 5 are jacked ahead from a propulsion start point 1 to a propulsion final point 2 subsequently while being added one after another. A plurality of inner pipes are arranged in multi-conduit pipes 6 wherein filler is charged between the inner pipes, and the multi-conduit pipes are being connected subsequently from the propulsion start point 1, they are jacked ahead to push out the propulsion pipes 5. Execution work is carried out by recovering the shield machine and the propulsion pipes 5 pushed out to the propulsion final point 2 the jacking, and replacing the propulsion pipes 5 into the multi-conduit pipes 6. It is thus possible to lay cables in the inner pipe inside the multi-conduit pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a multi-tube for laying multiple underground cables, and to a multi-tube used in the method.

[0002]

2. Description of the Related Art Conventional methods for laying multiple underground cables include a method using a propulsion pipe and a method using a plurality of cable storage pipes. In the method using a propulsion pipe, propulsion is performed while adding a large-diameter propulsion pipe, and after this propulsion, a cable pipe for storing a cable is provided in the propulsion pipe. In the method using the cable storage tube, a small-diameter cable storage tube is individually propelled by a cutting machine. Hereinafter, each method will be described with reference to the drawings.

FIGS. 11 to 15 show a conventional method using a propulsion pipe. First, as shown in FIG. 11, a press-fitting device 120 is installed in one of the shafts 100 formed in the ground, and the shield machine 130 is moved by the press-fitting device 120 to the other shaft 110.
Promote towards Then, as shown in FIG. 12, after the shield machine 130, the propulsion pipe 140 is sequentially propelled to the other shaft 110 while being added. The propulsion pipe 140 is a hollow tubular body, and sends out the shield machine 130 by adding the propulsion pipe. When the shield machine 130 reaches the other shaft 110, as shown in FIG. The propulsion is completed by removing the press-fitting device 120 from the shaft 100 while pulling it up from the 110 and removing it.

[0004] Thereafter, as shown in FIG. 13, a required number of cable tubes 150 are inserted into the continuous propulsion tube 140. The cable tube 150 is a thin-walled tube body given strength by glass fiber.
After the insertion, the filling mortar is injected into the inside of the propulsion pipe 140 by injection and filled, and the construction is completed as shown in FIG. In FIG. 15, reference numeral 160 denotes a multi-strand pipe having a solid interior formed by a plurality of cable pipes 150 and a filling mortar.

FIGS. 16 and 17 show the inside of the multi-strand tube 160. The filling tube mortar 170 fills the inside of the propulsion tube 140 in which the cable tube 150 is provided, so that the cable tubes 150 are fixed to each other. It has been done.

FIGS. 18 to 20 show a cable storage tube 180.
The conventional method using
Is installed, and a single cable storage tube 180 is propelled by the cutting machine 190 (FIG. 18). After that, the excavator 19
The height of 0 is changed, and the next cable storage tube 180 is propelled in parallel with the cable storage tube 180 at the preceding stage (FIG. 19). After repeating the propulsion and constructing the required number of cable containment pipes 180, the excavator 190 is removed and the process ends (FIG. 2).
0).

[0007]

However, the conventional method using the propulsion pipe 140 has the following problems. (1) In order to pipe the cable pipe 150 into the propulsion pipe 140, it is necessary for an operator to enter the propulsion pipe 140, and the diameter of the propulsion pipe 140 needs to be set to a size that allows the piping work inside. There is. For this reason, it becomes a large diameter such as 800 mm,
Not only is it heavy, but it requires a lot of power for propulsion. (2) The propulsion pipe 140 is used to secure a piping space for the cable pipe 150 and protect the cable pipe 150, but is not particularly required as a power pipe. Therefore, the conventional method of burying the propulsion pipe 140 wastes a lot of material. (3) Since the filling mortar 170 is a long-distance pumping,
It is necessary to select a material that can be pumped over a long distance. In addition, the filling mortar 170 has a thermal conductivity (G value) of 7
It must be 0 or less, and it is difficult to select a material that satisfies both of them, and it becomes expensive.

Next, the conventional method using the cable storage tube 180 has the following problems. (1) Since the drilling diameter is small and the thrust of the drilling machine 190 is small, when it encounters a stone or a ground with uneven hardness, not only the propulsion direction is deviated or meandering, but also the direction correction. Has become difficult. (2) The cable storage tube 180 to be cut later comes into contact with or comes into contact with the cable storage tube 180 propelled in advance, and cutting is not possible. (3) Since the cutting power is weak, the propellable length is short and many shafts are required. For this reason, the man-hour for constructing the shaft is increasing.

In view of the above, the present invention provides a method of constructing a multi-row pipe capable of solving the problems of the propulsion pipe method in principle, and a multi-row pipe used in the method. The purpose is to provide.

[0010]

In order to achieve the above object, a method for constructing a multi-tube according to the first aspect of the present invention is to provide a method for constructing a multi-row pipe in which a propulsion pipe is sequentially extended from a propulsion start point to a propulsion end point with a shield machine at the head. And a plurality of inner pipes are piped and a multi-row pipe filled with a filler material between the inner pipes is sequentially pushed from the propulsion starting point side while being propelled to push out the propulsion pipe, and this propulsion end point Recovering the shield machine and the propulsion pipe extruded into the pipe, and replacing the propulsion pipe with a multi-row pipe.

According to a second aspect of the present invention, in the first aspect of the present invention, after the replacement with the multi-row pipe, a backfill injection material is injected into a gap between the multi-ply pipe and the ground. It is characterized by.

The multi-strand pipe according to the invention of claim 3 is an outer pipe, a plurality of inner pipes provided in the outer pipe, a filler filled in the outer pipe to fix the inner pipe, A thrust transmission plate provided on the outer periphery on the propulsion side.

The invention according to claim 4 is the invention according to claim 3, wherein a backfill injection hole is formed in the outer tube,
A backfill injection pipe is inserted into the outer pipe, and the backfill injection pipe and the backfill injection hole are connected by a nozzle pipe having a check valve.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIGS. 1 to 4 show an embodiment of a method for constructing a multi-tube according to the present invention in the order of steps.

As shown in FIG. 1, the first
The first shaft 1 and the second shaft 2 serving as the propulsion end point are excavated in the ground, and the press-fitting device 3 is arranged in the first shaft 1. And
The shield machine 4 is connected to the press-in device 3, and the power of the press-in machine 3 drives the shield machine 4 toward the second shaft 2.

The shield machine 4 discharges the mud generated by the excavation while excavating the ground, and may use a muddy water type, a mud pressure type, or other known excavators.
FIG. 5 shows a shield machine 4 of a muddy water type. This shield machine 4
Is configured such that a cutter head 41 which is driven to rotate is attached to the tip of a tubular skin plate 40.
The cutter head 41 has a plurality of bits 4 for excavating the ground.
2 is attached, and the rear side of the cutter head 41 is a pressure chamber 44 separated from the rear by a partition wall 43. Into the pressure chamber 44, the distal end portions of a mud pipe 45 for pumping mud and a drain pipe 46 for discharging mud are inserted. The shield machine 4 having this structure stabilizes the face by filling the sealed pressure chamber 44 with muddy water, and mixes and discharges the earth and sand excavated by the cutter head with the muddy water.

On the rear side of such a shield machine 4, FIG.
The propulsion pipes 5 are connected as shown in FIG. 5 and the propulsion is continued while the propulsion pipes 5 are sequentially connected to the rear. in this case,
The propulsion of the propulsion tube 5 is performed while auxiliary lubricating material for extruding the propulsion tube 5 is injected. The propulsion pipe 5 may have the same structure as the propulsion pipe used in the conventional method. FIG. 5 shows the propulsion pipe 5, which has a hollow tube inside, and through which a mud feeding pipe 45 and a mud discharging pipe 46 (see FIG. 5) can be inserted.

FIG. 3 shows a process in which the shield machine 4 reaches the second shaft 2 by performing propulsion while adding the propulsion pipe 5. In this step, the shield machine 4 is removed from the second shaft 2 and collected. In addition, depending on the soil quality and the progress of propulsion, a middle push device equipped with a middle push jack (Japanese Patent Application No. Hei 8
143634) may be inserted between the propulsion pipes 5 to increase the propulsion force.

After the shield machine 4 has been removed, a multi-row pipe 6 having substantially the same diameter is added to the last propulsion pipe 5, and the foremost propulsion pipe 5 is pushed out to the second shaft 2. Then, as shown in FIG. 4, the propulsion pipe 5 is pushed while the next multi-row pipe 6 is sequentially added to the preceding multi-row pipe 6, whereby the propulsion pipe 5 is sequentially moved to the second shaft 2. Extrude. The extruded propulsion pipe 5 is pulled up from the second shaft 2 by a crane 7 or the like, collected, and reused for new construction.

FIGS. 7 to 9 show the structure of the multi-walled pipe 6, which has an outer pipe 60 made of a skin plate (steel pipe) and a plurality of inner pipes 61 provided inside the outer pipe 60. . A high-strength mortar 62 is injected between the outer tube 60 and the inner tube 61 as a filler. The mortar 62 is an outer tube 60
The mortar 62 and the outer tube 60 are joined by a fixing anchor 63. further,
The injected mortar 62 densely fills the gap between the outer tube 60 and the inner tube 61, and the filling restricts the movement of the inner tube 61 and is fixed at a fixed position.

At the tip of the outer tube 60, a thrust transmitting plate 65 is attached. The thrust transmission plate 65 is made of a ring-shaped steel plate, and is attached so as to be in close contact with the outer peripheral side of the front end surface of the outer tube 60, thereby pushing the rear end surface of the preceding propulsion tube 5 or another preceding multi-row tube 6. In this manner, thereby transmitting thrust to the preceding tube.

Reference numeral 64 denotes a hanging bracket protruding from the outer tube 60, and is used for suspending and transporting the multi-story tube by a crane. Reference numeral 66 denotes a reinforcing rib made of a ring-shaped steel plate embedded at appropriate intervals along the length direction of the outer tube 60, and is incorporated to provide strength to the outer tube 60.

The inner tube 62 is for wiring a cable inside, and a required number of tubes are inserted into the outer tube 60. In the illustrated embodiment, the inner tubes 61 are arranged in three rows and three stages.

Further, a backfill injection hole 67 communicating with the outside is formed at an appropriate portion of the outer tube 60,
A backfill injection pipe 68 is inserted into the inside of the tube 0 along the length direction and is piped.

FIG. 10 shows the relationship between the backfill injection hole 67 and the backfill injection tube 68.
The branch pipe 68a is formed toward the outside of the branch pipe 68a.
And the backfill injection hole 67 are connected by a nozzle tube 69. The nozzle pipe 69 has a check valve 70 therein. The check valve 70 allows passage of the flow from the backfill injection pipe 68 side, but blocks the flow from the outside toward the backfill injection pipe 68. The backfill injection hole 67 and the backfill injection pipe 68 are used for discharging a backfill injection material described later.

The multi-tube 6 is manufactured in advance in a factory, transported to a construction site, and used. The multi-walled pipe 6 is manufactured by forming an outer pipe 60 made of a skin plate and reinforcing ribs 6.
6. The fixing anchor 63, the thrust transmission plate 65, and the backfill injection pipe 68 are assembled by welding to form an assembly, and the inner pipe 61 is piped inside the assembly. The mortar 62 is poured in between, and the mortar 62 is aged and hardened.

Since the mortar 62 is manufactured at the factory as described above, it is not necessary to consider the long-distance pumping of the mortar 62. For this reason, it is only necessary to select a material that satisfies the condition that the thermal conductivity is 70 or less as the mortar 62, so that the degree of freedom in material selection is increased and an inexpensive mortar can be used.

The multi-row pipe 6 having the above structure is replaced with the preceding propulsion pipe 5 as shown in FIG. Multi-row pipe 6
Has an inner tube 61 for wiring the cable integrally therein, and simultaneously connects the multi-strand tube 6 with the cable tube 15.
0 (see FIG. 14) is in the same state as when piping is performed. Therefore, it is not necessary to pipe the cable pipe 150 later inside the propulsion pipe 140 (see FIG. 12) as in the related art. Therefore, in this embodiment, the outer diameter of the propulsion pipe 5 and the outer diameter of the multi-row pipe 6 can be reduced.

For example, when the inner pipe 61 (cable pipe 150) having a diameter of 150 mm is provided in three rows and three stages, the conventional propulsion pipe 140 has a cross-sectional area of 0.724 m 2. 5 and the multi-walled pipe 6, 0.567
The sectional area of m2 may be sufficient, and the diameter can be reduced by 20% or more. Therefore, the propulsion cross section is reduced, the propulsion with a small thrust can be performed, and not only the entire device can be downsized,
The amount of earth removal is reduced, and construction can be performed quickly and inexpensively.

In this embodiment, the propulsion pipe 5 is collected and reused by replacing the propulsion pipe 5 with the multi-row pipe 6 without burying the propulsion pipe 5. Therefore, there is no waste of materials.

After the replacement with the multi-row pipe 6 as described above, the backfill injection material is injected into the gap between the multi-row pipe 6 and the ground. As shown in FIG. 10, the backfill injection is performed by forcing the backfill injection material (not shown) into the backfill injection pipe 68 and discharging the backfill injection material from the check valve 70. By this discharge, the backfilling filling material is filled in the gap 76 between the multi-row pipe 6 and the ground 75.

Then, the filling of the backfill filling material brings the multi-row pipe 6 into close contact with the ground 75, so that the looseness of the ground 75 can be prevented. Also in such backfill injection, since the backfill injection pipe 68 is provided inside the multi-row pipe 6, the work can be performed efficiently. The backfill material is a material in which cement, clay, bentonite, and other materials are dispersed in water, and the compounding components are appropriately changed depending on the soil properties of the ground.

[0033]

As described above, according to the present invention,
Since the propulsion pipe is replaced with a multi-row pipe, the previously buried propulsion pipe can be collected and reused. Therefore, the material can be effectively used.

Further, since the multi-strand pipe has an inner pipe through which a cable can be wired, it is not necessary to pipe a cable pipe later, and the multi-strand pipe and the propulsion pipe can be reduced in diameter. Therefore, the propulsion is facilitated and the construction can be performed quickly. In addition, since the in-pipe piping work of the cable pipe is not required, the workability is improved.

Further, since the multi-walled pipe is manufactured in advance at the factory, it is not necessary to consider the long-distance feeding of the mortar filled therein. For this reason, the degree of freedom of mortar selection is expanded, and an inexpensive mortar can be used.

In addition, the present invention is a method using a conventional propulsion pipe, and it is not necessary to cut down a small-diameter cable storage pipe. No more worry.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention before construction.

FIG. 2 is a sectional view of a propulsion process of a propulsion pipe.

FIG. 3 is a sectional view of a step of collecting the shield machine.

FIG. 4 is a sectional view of a step of replacing a propulsion pipe with a multi-row pipe.

FIG. 5 is a sectional view of the shield machine.

FIG. 6 is a sectional view of a propulsion pipe.

FIG. 7 is a cross-sectional view of a multi-tube.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a sectional view taken along line BB of FIG. 7;

FIG. 10 is a cross-sectional view of a portion for performing backfill implantation.

FIG. 11 is a sectional view of a conventional method using a propulsion pipe before construction.

FIG. 12 is a sectional view showing a propulsion process of a propulsion pipe in a conventional method.

FIG. 13 is a cross-sectional view of a recovery step of the shield machine in a conventional method.

FIG. 14 is a cross-sectional view showing a pipe of a cable pipe in a conventional method.

FIG. 15 is a cross-sectional view of a final stage of construction performed by a conventional method.

FIG. 16 is a sectional view of a propulsion pipe constructed by a conventional method.

FIG. 17 is a sectional view taken along line XX of FIG. 15;

FIG. 18 is a cross-sectional view of a conventional method using a cable storage tube during construction.

FIG. 19 is a sectional view of a step of constructing a plurality of cable storage tubes.

FIG. 20 is a cross-sectional view of a plurality of cable storage tubes after construction.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first shaft 2 second shaft 3 press-fitting device 4 shield machine 5 propulsion pipe 6 multi-row pipe 60 outer pipe 61 inner pipe 65 thrust transmission plate 68 backfill injection pipe 67 backfill injection hole 69 nozzle pipe 70 check valve

Continued on the front page (72) Inventor Akira Takagi 4-32-22 Nishi Shinjuku, Shinjuku-ku, Tokyo Odakyu Construction Co., Ltd. (72) Inventor Akira Eguchi 4-32-22 Nishi-Shinjuku, Shinjuku-ku, Tokyo Odakyu Construction Co., Ltd. (72) Inventor Masashi Yoshiya 4-32-22 Nishi-Shinjuku, Shinjuku-ku, Tokyo Odakyu Construction Co., Ltd.

Claims (4)

[Claims] 1. The propulsion pipes are sequentially arranged with the shield machine at the top,
The process of propulsion from the propulsion start point to the propulsion end point while adding, and the propulsion while propelling while connecting multiple inner pipes and the multi-row pipe filled with filler between the inner pipes sequentially from the propulsion start point side Extruding the pipe, collecting the shield machine and the propulsion pipe pushed to the end point of the propulsion by this propulsion, and replacing the propulsion pipe with the multi-tube. 2. The method according to claim 1, wherein after the replacement with the multi-pipe, a backfill injection material is injected into a gap between the multi-pipe and the ground. 3. An outer pipe, a plurality of inner pipes provided in the outer pipe, and a filler filled in the outer pipe to fix the inner pipe;
A thrust transmission plate provided on the outer periphery of the outer tube on the propulsion side of the outer tube. 4. A backfill injection hole is formed in the outer tube, and a backfill injection tube is inserted into the outer tube. The backfill injection tube and the backfill injection hole are connected to each other by a check valve. The multi-row pipe according to claim 3, wherein the pipe is connected by a nozzle pipe having: