JP3703638B2 - Construction method of multi-strip pipes for underground cables such as electric power - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a multi-strip pipe for laying a multi-strip underground cable such as a power line.
[0002]
[Prior art]
As a conventional method of laying a multi-strand underground cable, there are 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 a large-diameter propulsion pipe is added, and after the propulsion, a cable pipe for storing a cable is provided in the propulsion pipe. In the method using a 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.
[0003]
8 to 1 2 illustrates a conventional method of using the propulsion tube. First, as shown in FIG. 8 , a press-fitting device 120 is installed in one shaft 100 formed in a natural ground, and the shield machine 130 is propelled toward the other shaft 110 by the press-fitting device 120. Then, as shown in FIG. 9 , the propulsion pipe 140 is sequentially propelled to the other shaft 110 while being added after the shield machine 130. Propulsion tube 140 is a tube of inside cavity, feeding a shielding unit 130 by replenishing of the propulsion tube 140, when the shield machine 130 has reached the other vertical shaft 110, the shield machine 130 as shown in FIG. 10 While lifting from the shaft 110 and removing it, the press-fitting device 120 is removed from the shaft 100 and the propulsion ends.
[0004]
Thereafter, as shown in Figure 1 1, to insert the cable tube 150 need Article number inside the propulsion tube 140 are continuous. Cable tube 150 is thin tubular-body strength imparted by the glass fiber, after insertion of the cable tube 150, filled by injecting a medium packed mortar by pumping the interior of the propulsion tube 140, in FIG. 1 2 Finish construction as shown. 1 2, reference numeral 160 is a multi-strip tube inside becomes a solid by a plurality of cables pipe 150 and the medium filling the mortar.
[0005]
1 3 and 1 4 is its sectional view taken along line X-X represents the inside of the multi-start tube 160, the interior of the propulsion tube 140 cable tube 150 is a pipe, by the medium filling the mortar 170 is filled, The cable tubes 150 are fixed to each other.
[0006]
1. 5 to FIG. 1 7 is a conventional method of using a cable storage tube 180, established the KezuSusumu machine 190 Shaft 100, this KezuSusumu machine 190 to drive the cable storage tube 180 of Article 1 (FIG. 1 5 ). Then, in parallel to promote and to change the height of the cutting proceeds machine 190 next cable storage tube 180 to the front stage of the cable storage tube 180 (Fig. 1 6). After repeating this propulsion and constructing the necessary number of cable storage pipes 180, the excavator 190 is removed and the process ends (FIG. 17 ).
[0007]
[Problems to be solved by the invention]
However, the conventional method using the propulsion pipe 140 has the following problems.
(1) In order to pipe the TPFP cable pipe 150 into the propulsion pipe 140, it is necessary for an operator to enter the propulsion pipe 140, and a propulsion pipe having a nominal diameter of 800 mm or more that allows humans to work in the pipe regardless of the number of pipes. It must be constructed with a size that allows piping work inside. For this reason, there is a limit to the reduction of the cross section of the propulsion pipe, which is not only heavy but also requires great power for propulsion.
(2) In the case of the two-step type propulsion method, a guide pipe used in the first step is required, which requires production costs and costs for storage space and maintenance for reuse.
[0008]
Next, the conventional method using the cable storage tube 180 has the following problems.
(1) Since the cutting diameter is small and the thrust of the cutting machine 190 is small, when encountering stones or ground with non-uniform hardness, the propulsion direction is not correct, meandering, and direction correction Has become difficult.
(2) The cable storage tube 180 to be advanced later comes into contact with or comes into contact with the cable storage tube 180 that has been propelled in advance, making it impossible to perform the reduction.
(3) Since the cutting force is weak, the length that can be propelled is short and many shafts are required. For this reason, the man-hour which constructs a shaft has increased.
[0009]
In view of the above, an object of the present invention is to provide a construction method using a propulsion pipe in principle and a construction method for a multi-strip pipe capable of solving the problems of the propulsion pipe construction method.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the method of constructing the multi-strip pipe of the invention of claim 1
After the step of propelling the propulsion pipe from the propulsion start point to the propulsion end point while sequentially adding the propulsion pipe with the excavator at the top, the step of propelling the multi-pipe for cable wiring from the propulsion start point to the propulsion end point is sequentially performed. In the construction method of a process type underground cable with multiple underground lines, a step of supplementarily injecting a lubricant for pushing out the propelling pipe at the time of propulsion of the propelling pipe, and a first used at the beginning of the second process recovering internal beforehand Urakomi injection tube of the tube, the steps of the pipe with storage tube fixed grating fitting the cable storage tube of required number of threads, a shield machine which has reached the arrival pit by promoting the pre Symbol first tube And after confirming the connection between the back injection pipe already installed in the first pipe and the back injection pipe of the second pipe, after propelling the second pipe, and after propelling the second pipe to a predetermined length, Install it in the second pipe using the containment pipe guide. The step of connecting the necessary number of cable storage pipes with the cable storage pipe of the first pipe respectively, and the propulsion pipe collected at the arrival vertical shaft, installing a back-injection pipe and a storage pipe fixing grid bracket at the start vertical shaft, Repeating the second pipe and propelling it, and repeating the process of connecting the cable storage pipe until the first pipe reaches a predetermined position, and the continuity test after the completion of the second pipe promotion After completion, the first pipe and the final pipe port are closed, and a step of placing a filling mortar is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings. FIGS. 1 (1) to ( 6 ) and FIGS. 2 (1) to (6) show an embodiment of the method for constructing a multi-strip pipe according to the present invention. It shows in order of process.
[0013]
As shown in FIG. 1 (1) , a first shaft 1 that is a propulsion start side and a second shaft 2 that is a propulsion end point are excavated in a natural ground, and a press-fitting device 3 is arranged in the first shaft 1. . Then, the tuyere or the excavator 4 is connected to the press-fitting device 3, and the excavator 4 is propelled toward the second shaft 2 by the power of the press-fitting device 3.
[0014]
The excavator 4 discharges mud generated by excavation while excavating the ground, and a muddy water type, mud pressure type, and other known excavators can be used. FIG. 3 shows a muddy water type excavator 4. The tuyere or digging machine 4 is configured by attaching a cutter head 41 that is rotationally driven to the tip of a tubular skin plate 40. A plurality of bits 42 for excavating natural ground are attached to the cutter head 41, and the rear side of the cutter head 41 is a pressure chamber 44 partitioned from the rear portion by a partition wall 43. Inserted into the pressure chamber 44 are tip portions of a mud pipe 45 for pumping mud water and a mud pipe 46 for discharging mud water. The shield machine 4 having this structure stabilizes the face by filling the sealed pressure chamber 44 with muddy water, and discharges the earth and sand excavated by the cutter head with muddy water.
[0015]
A propulsion pipe 5 is connected to the rear side of the excavator 4 as shown in FIG. 1 (2), and the next propulsion pipe 5 is sequentially connected to the rear side of the excavator 4 so as to continue the process . . In this case, the propulsion pipe 5 is propelled while supplementarily injecting a lubricant for pushing out the propulsion pipe 5. As the propulsion pipe 5, one having the same structure as the propulsion pipe used in the conventional construction method can be used . Estimated Susumukan 5, inside which a hollow tube, Okudorokan 45, enables the insertion of Haidorokan 4 6.
[0016]
FIG. 1 (3) shows a process in which the excavator 4 reaches the second shaft 2 by performing the propulsion while adding the propulsion pipe 5. In this state, as shown in the figure, preparation for propulsion of the first pipe 50 used at the beginning of the second step is made. That is, the work of piping the back injection pipe 68 and the necessary number of cable storage pipes 61 together with the storage pipe fixing grid fitting 72 in advance inside the hollow pipe (the state shown in FIG. 6).
[0017]
And as shown in the process of FIG. 1 (4) , the 1st pipe | tube 50 is pushed in with the press injection apparatus 3, and the excavation machine 4 is removed from the 2nd shaft 2, and is collect | recovered. Depending on the progress of the soil and the propulsion, an intermediate pushing device (Japanese Patent Application No. 8-143634) equipped with an intermediate pushing jack may be inserted between the propelling pipes 5 to increase the propulsive force.
[0018]
After removing the excavator 4, the first pipe 50 to subsequent subsequent second tube 51, the concrete pipe 71 and the like, Urakomi injection pipe 68 in the starting pit 1, set up a storage tube fixed grating bracket 72, installing the second pipe 51 to the propulsion frame 73, after the connection confirmation between Urakomi injection tube 68 already installed in the first pipe 50, to promote the second tube 51, up to a predetermined length the second pipe 51 After propulsion (FIG. 1 (6)), the storage pipe piping guide 74 shown in FIG. 18 is used to connect the storage pipe of the first pipe 50 and the storage pipe of the second pipe 51 as many as necessary (FIG. 1). 2 (1)), the back propelling pipe 68 and the containment pipe fixing grid fitting 72 are installed at the starting shaft 1 to the next propulsion tube 5 collected at the reaching shaft 2, that is, the concrete tube 71 which is a hollow tube. Until the first pipe 50 reaches a predetermined position, the steps of the second pipe 51 (FIG. 1 (6) to FIG. 2 (3)) are finished. Until 2 repeatedly (FIG. 2 (4)), after the completion of the continuity test after promotion ends, closing the mouth of the first pipe 50 and the final tube 52, to pouring the medium filling mortar (Fig. 2 (5)).
[0019]
As shown in FIGS. 4 and 5 , the inner pipe 61 that is the cable storage pipe described above is used for wiring a cable therein, and is an outer pipe that is a concrete pipe used for the propulsion pipe 5 and the like. The required number is inserted into the tube 60. In the illustrated form, the inner pipe 61 is arranged in three rows and three stages.
[0020]
Further, a backfill injection hole 67 communicating with the outside is formed at an appropriate portion of the outer tube 60, and a backfill injection tube 68 is inserted into the outer tube 60 along the length direction and piped. ing. FIG. 6 shows a state in which the back injection pipe 68, the cable storage pipe 61, and the storage pipe fixing lattice fitting 72 for storing the cable storage pipe 61 are installed in the outer pipe 60.
[0021]
FIG. 7 shows the relationship between the backfill injection hole 67 and the backfill injection pipe 68. The backfill injection pipe 68 is formed with a branch pipe 68a toward the outside of the outer pipe 60. The branch pipe 68a and the backfill injection hole are formed. 67 is connected by a nozzle tube 69. The nozzle tube 69 includes a check valve 70 therein. The check valve 70 can pass the flow from the backfill injection pipe 68 side, but blocks the flow toward the backfill injection pipe 68 from the outside. Such backfill injection holes 67 and backfill injection pipes 68 are used for discharging the backfill injection material described later.
[0022]
As shown in FIG. 1 (4), the multi- tube having the above structure is replaced with the propulsion tube 5 that precedes it. Multi-threaded tube (such as 50) has integrally therein the inner tube 61 for routing cables, simultaneously with the connection of the multi-strip tubes, similar to the cable tube 150 (see FIG. 1 2) is a pipe It becomes the state of. Therefore, it is not necessary to pipe the cable pipe 150 later in the propulsion pipe 140 (see FIG. 10 and the like ) as in the prior art. For this reason, in this embodiment, the outer diameter of the propulsion pipe 5 and the outer diameter of the multi-tubular pipe 6 can be reduced.
[0023]
For example, when the inner pipe 61 (cable pipe 150) having a diameter of 150 mm is piped in three rows and three stages, the conventional propulsion pipe 140 has a cross-sectional area of 1.131 m ² , the propulsion pipe 5 of this embodiment and The multi-tubular tube 6 may have a cross-sectional area of 0.724 m ² and can be reduced in diameter by 35% or more. Accordingly, the propulsion section is reduced, the propulsion can be performed with a small thrust, and not only the entire apparatus can be reduced in size, but also the amount of discharged soil can be reduced, and the construction can be performed quickly and inexpensively.
[0024]
As described above, after the replacement with the multi-tube (such as 50) , the backfilling injection material is injected into the gap between the multi-tube and the ground. The back-filling injection is performed by ejecting back-filling injection material back-filling grout into the back-filling injection tube 68 (not shown) from the pumping to the check valve 70. By this discharge, the backfilling injection material is filled in the gap 76 between the multi-tube and the natural ground 75 (see FIG. 7 and FIG. 2 (6)) .
[0025]
And since the multi-strip | pipe 6 and the natural ground 75 closely_contact | adhere by filling with backfilling injection material, the looseness of the natural ground 75 can be prevented. Also in such backfilling injection, the backfilling injection pipe 68 is piped inside the multi-strip pipe, so that the work can be performed efficiently. The backfilling injection 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 quality of the natural ground.
[0026]
19 and 20 are drawings for explaining a pipe guide diagram and situation of the second pipe of the present invention. In addition, the storage pipe piping guide 74 has a configuration in which an enlarged diameter portion is provided at the tip of the rod-like body as shown in the figure.
(1) First, the center line of the second pipe 51 is aligned with the first pipe 50, and it is pushed and connected by a jack or the like. At this time, the connection of the backfill injection tube is confirmed (FIG. 19 (1)).
(2) Next, the tip of the storage pipe piping guide 74 (see FIG. 18) is inserted into the storage pipe 61 of the first pipe 50 (FIG. 19 (2)).
(3) The storage tube 61 is pushed into the second tube 51 (FIG. 19 (3)).
(4) By the containment pipe guide 74, the center line is gradually adjusted (matched) (FIG. 20 (1)).
(5) Push the distal end of the storage pipe 61 into the first pipe 50, and then tap the storage pipe piping guide 74 to a predetermined position with a pulling hammer or the like (FIG. 20 (2)).
(6) The storage pipe piping guide 74 is moved to the next storage pipe 61 (FIG. 20 (3)).
[0027]
【The invention's effect】
In addition, since the multi-strip pipe includes an inner pipe capable of wiring the cable, it is not necessary to pipe the cable pipe later, and the multi-strip pipe and the propulsion pipe can be reduced in diameter. Therefore, the propulsion is facilitated and the construction can be performed quickly. Furthermore, since troublesome in-pipe piping work for the cable pipe is not required, workability is improved.
[0028]
In addition, the present invention is a construction method using a conventional propulsion pipe, and since there is no need to cut a small-diameter cable storage pipe, there is a concern that it will meander like a cable storage pipe or that it cannot be cut. Disappears.
[0029]
At the time of propulsion of the temporary pipe of the present invention (first step), a propulsion method with a lot of construction results can be selected according to the soil condition and the surrounding environment. For this reason, reliable construction is possible without problems such as construction safety and quality.
[0030]
This method employs a two-stage propulsion method, but the temporary pipe (concrete pipe) (reference numeral 5, reference numeral 71) used in the first process is collected at the vertical shaft and reused in the second process. It is not necessary to prepare a separate guide tube that is normally used in the two-stage propulsion method.
[0031]
In the case of constructing the same number of strips, this construction method can reduce the propulsion cross section compared to the conventional construction method, and therefore can reduce costs such as downsizing the propulsion equipment and reducing the amount of residual soil treatment. For example, when constructing 9 pipes (3 sections, 3 stages) with a diameter of 150 mm, it was constructed with a concrete pipe (nominal diameter of 1,000 mm) in the conventional construction, but with this method, it was constructed with a concrete pipe (nominal diameter of 800 mm). Since this is possible, the cross-sectional area is reduced by 35%.
[0032]
In principle, the construction method eliminates the work in the pipe, so that the conventional construction with a nominal diameter of the propulsion pipe of less than 800 mm can be similarly performed. For this reason, since it constructs with the propulsion diameter according to the number of required stripes, a cross section can be reduced and it becomes cost reduction.
[0033]
Since this method can be backfilled, there is little impact on the surrounding ground.
[Brief description of the drawings]
FIGS. 1 (1) to (6) are construction process diagrams (pre-process) according to an embodiment of the present invention.
FIGS. 2 (1) to (6) are construction process diagrams (post-process) according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a tuyere or excavator.
FIG. 4 is a cross-sectional view of a multi-tubular tube.
FIG. 5 is a cross-sectional view of a multi-tubular tube.
FIG. 6 is a cross-sectional view of a multi-tube.
FIG. 7 is a cross-sectional view of a portion where backfill injection is performed.
FIG. 8 is a sectional view before construction of a conventional method using a propulsion pipe.
FIG. 9 is a cross-sectional view showing a propulsion process of a propulsion pipe in a conventional method.
FIG. 10 is a cross-sectional view of a shield machine recovery step in a conventional method.
FIG. 11 is a cross-sectional view showing cable pipe piping in a conventional method.
FIG. 12 is a sectional view at the end stage of construction by a conventional method.
FIG. 13 is a cross-sectional view of a propulsion pipe constructed by a conventional method.
14 is a cross-sectional view taken along line XX of FIG.
FIG. 15 is a cross-sectional view of a conventional method using a cable storage tube during construction.
FIG. 16 is a cross-sectional view of a process for constructing a plurality of cable storage tubes.
FIG. 17 is a cross-sectional view after construction of a plurality of cable storage pipes.
FIG. 18 is a second pipe piping guide diagram of the present invention.
FIG. 19 is a second pipe piping situation diagram (pre-process) of the present invention.
FIG. 20 is a second pipe piping situation diagram (post-process) of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st shaft 2 2nd shaft 3 Press fitting apparatus 4 Excavator 5 Propulsion pipe 50 1st pipe 51 2nd pipe 60 Outer pipe 61 Inner pipe 67 Backfill injection hole 68 Backfill injection pipe 69 Nozzle pipe 70 Check valve 71 Concrete pipe 72 Containment pipe fixing grid fitting 73 Propulsion stand 74 Containment pipe piping guide

Claims (1)

After the step of propelling the propulsion pipe from the propulsion start point to the propulsion end point while sequentially adding the propulsion pipe with the excavator at the top, the step of propelling the multi-pipe for cable wiring from the propulsion start point to the propulsion end point is sequentially performed. In the construction method of underground cable multi-strip cable such as process type power,
A step of supplementarily injecting a lubricant for pushing out the propelling pipe when propelling the propelling pipe ;
The process of piping the back injection pipe and the necessary number of cable storage pipes together with the storage pipe fixing grid bracket in the first pipe used at the beginning of the second process,
Recovering the excavator that has reached the vertical shaft by propelling the first pipe;
After confirming the connection between the back injection pipe already installed in the first pipe and the back injection pipe of the second pipe, the step of promoting the second pipe,
After propelling the second pipe to a predetermined length, using the containment pipe piping guide, connecting the necessary number of cable containment pipes to be installed in the second pipe to the cable containment pipe of the first pipe,
A step of installing a back-injection pipe and a containment pipe fixing grid fitting at the start shaft, and propelling it after the second pipe and connecting the cable containment pipe to the propulsion pipe collected at the arrival shaft. Repeating the first tube until it reaches a predetermined position;
After the completion of the continuity test after the completion of the second-stage pipe promotion, the first pipe and the final pipe port are closed, and a filling mortar is placed;
The construction method of the multi-strip | pipe of an underground cable, such as electric power characterized by comprising.

Images