JPS62280491A - Method of pre-fabricated perforated pipe propulsion construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention relates to a prefabricated perforated pipe propagation method for forming a cable storage conduit underground.

(Prior art) Conventionally, in order to form a cable storage pipe underground, a propulsion pipe is placed behind an excavator having a cutter or the like at the tip, and the pipe is pushed from behind with a pushing device such as a jack to propel it. A propulsion pipe is buried in the soil, a required number of small diameter cable storage pipes are inserted into the buried propulsion pipe, and then the gap between the propulsion pipe and the cable storage pipe is lined with an appropriate filler. I was putting a lot of effort into it.

Alternatively, an excavator and a guiding pipe equipped with a screw conveyor, which is a means of transporting the excavated soil, are passed through the area where the cable storage conduit is to be formed up to the reaching shaft.
It has been proposed that after the excavation of soil is completed, a single porous conduit having a predetermined number of cable storage conduits inserted therein is successively pushed into the conduit.

(Problem to be solved by the invention) However, according to the former construction method, the propulsion pipe is buried, then the cable storage pipe is inserted, and finally the filler is injected.
Unless the work procedure of solidification is taken into account, conduits for cable storage cannot be formed underground. Therefore, equipment suitable for each work is first required, and in addition, the labor and work associated with each work is required. Due to preparations for the transition, the effort, time, and expense required for the work was enormous.

On the other hand, the latter method results in double work and time, and in addition to the excavator and perforated pipe, a guide pipe with built-in transport means is connected from the starting shaft to the destination shaft. You must prepare enough for the length up to.

(Means for solving the problem) This idea was made in view of the above points, and a prefabricated pipe with a through hole forming a cable storage conduit in the axial direction is installed at the rear end of the excavator. This problem is solved by providing a construction method in which the excavated soil is directly pushed into unexcavated soil using a propulsion method, and the excavated soil is discharged directly backward through a through hole in the prefabricated pipe.

As for the specific configuration of the present invention, a prefabricated pipe having through-holes configuring the cable storage conduit appropriately laid in its axial direction can be excavated using an excavating device such as a cutter and an excavated soil discharge means. Place them at the rear end of the machine and insert them into the soil that has not yet been excavated from the inside surface of the starting side of the shaft.
The rear end of the prefabricated pipe is pushed by a pressing device, and the excavated soil is discharged rearward through the through hole of the prefabricated pipe. Then, each time the prefabricated tube is propelled a certain length, another prefabricated tube is added from the rear end of the pushed prefabricated tube, and while the through holes of each prefabricated tube are aligned with each other, appropriate means such as fixation with bolts or separate through holes are drilled in the prefabricated tube. The prefabricated pipes are locked to each other by inserting a PC steel wire or the like through the prefabricated pipes, and the last prefabricated pipe is sequentially pushed to discharge the excavated soil from the through hole of the prefabricated pipe. is left in the soil.

(Function) The excavated earth generated during propulsion is discharged from the excavator through the through holes of each prefabricated pipe that constitutes the cable storage conduit, so each through hole serves as a path for earth and sand discharge during propulsion. After construction is complete, it will be used as a cable storage conduit. Of course, an appropriate pipe may be passed through this through hole.

Furthermore, since the prefabricated tubes are mutually locked by appropriate means, they will not shift or come off during propulsion.

(Example) Hereinafter, embodiments of this invention will be described with reference to the drawings.

Figures 1 and 2 are diagrams of the prefabricated pipe 1 used in this embodiment, and as is clear from each figure, the prefabricated pipe 1
has a substantially cylindrical shape, and has a substantially rectangular convex portion 1a with rounded corners on its end face side, and this convex portion 1a on the other side.
A recessed portion 1b is provided that matches the shape of the recessed portion 1b.

The through holes constituting the cable storage conduit in this embodiment are a total of six circular through holes 2.3.4.5.6.7 within the range connecting the convex portion 1a and the concave portion 1b. It is perforated in the axial direction of l. Separately from this, a through-type connecting hole 8.9.10.11 is also bored in the axial direction of the prefabricated pipe 1 and serves as a locking means for preventing mutual displacement of the pipes, which will be described later. Further, the outer periphery of the side surface of the convex portion 1a is coated with a sealing material 12.

Next, the construction method according to the embodiment will be explained with reference to FIG. 3 and subsequent figures. Figure 3 shows a state in which construction has progressed halfway, and is an excavator equipped with a cutter η at the front, and a prefabricated pipe that has already been propelled is located at the rear end of the excavator 21. After that, there is a prefabricated pipe that was then added and propelled.

The excavator 21 in this embodiment is provided with a partition wall 5 at the rear of the interior, and a drive device M is provided between the partition wall 5 and the rear end surface.
This drive device γ rotates the cutter n and the screw conveyor A, which is a means for transporting excavated soil. An earth and sand pressure pump serving as excavation and discharge means is installed in a chamber located below the screw conveyor 4 at the rear of the direction adjustment unit 4 in the excavator 21. This earth and sand pump 7'30 used in this example includes an outer cylinder 30a that can freely slide rearward, an inner cylinder 30b located inside the outer cylinder 30a, a piston 30c located inside the inner cylinder, and a piston 30c. A hydraulic jack 30d is activated, and the outer cylinder 30a slides toward the earth and sand chamber 31 around the end of the screw conveyor to take in the excavated soil in the earth and sand chamber, and is directly connected to a pressure feeding port 32 provided below the partition wall 5. The pressure feed port 32 is provided with a pressure feed pipe, and its rear end is connected to a discharge port at the rear end of the excavator 21.

The rear end of the excavator 21 has a shape into which the convex portion 211 of the prefabricated pipe is fitted, and the negative through hole of the prefabricated pipe matches the discharge port.

A and A are PC steel wires, which pass through the connecting holes 37 and wings of the prefabricated tubes O and S, respectively, and are connected to each other. The end of the PC steel wire on the side of the excavator 21, that is, the front end, is fixed to the periphery of the front end of the connecting hole. The connecting holes are illustrated with their relative positions changed.) Although not shown in the figure, the PC steel wires that prevent the prefabricated tubes from shifting from each other are passed through three other locations in each prefabricated tube 23 and 24.

Regarding the subsequent work, first pass the PC steel wire 41 through the connection hole 4o of the prefabricated pipe 39 to be added, and connect the PC of the rearmost prefabricated pipe wing that has already been propelled.
Connect to steel wire A. After that, the convex portion 3 of the prefabricated pipe 39
9a into the recess 24b of the prefabricated pipe feed, and align the through holes 42, 43, etc. of each prefabricated pipe wing 39 with each other, and while tensioning the PC'iA wire 41 with another object, The push ring 46 of the original push jack 45 installed in the shaft (2) is applied to the rear end of the prefabricated pipe 39 to press it. In this way, the propulsion is carried out as shown in Figure 1.

During the propulsion, the excavated soil cut by the cutter n is transferred to the earth and sand chamber 31 by the screw conveyor path, and is transferred from the pressure feed port to the pressure feed pipe section, and then to the discharge port by the soil pressure pump beauty piston 30c. This through hole 47 is made from the through hole 47 of the prefabricated pipe that matches the tone.
Other prefabricated pipes that match and 39 through holes 4
2 and 43, and is discharged to the starting side shaft 44.

In this case, an appropriate discharge pipe and hose (not shown) are inserted into the through holes 47, 42, and 43 of each prefabricated pipe 23, 24, and 39 in advance, and the earth is excavated inside the discharge pipe and hose. Better discharge can be achieved by discharging and transporting.

When the propulsion of the prefabricated pipe I is completed, the push ring 46 of the pusher jack 45 is pulled back as shown in FIG. 5, and the operations shown in FIG. 3 and subsequent steps are repeated again.

The construction method according to this example is as described above, and the prefabricated pipe used in this example, as shown in FIG. 1, does not leak excavated soil or the like from the joint.

Furthermore, after the construction is completed, the airtightness of the through hole, which will serve as the cable storage conduit, will be maintained.

In addition, in the above embodiment, the PCA wire is passed through the through-type connecting hole, which contributes to preventing the mutual displacement of the prefabricated pipes. The condition becomes stronger and the so-called "tightness" improves. The invention is not limited to this, but prevention of misalignment between the prefabricated tubes may be achieved by, for example, providing a non-penetrating bottle hole at one end of the prefabricated tube and a vial at the other end.

In addition to pressure pumps, separation,
It is also possible to propose a small-diameter screw conveyor that can be freely connected, or a tunneling machine that passes through the through holes of each prefabricated pipe.

(Effects of the Invention) According to the present invention, a cable storage conduit can be formed underground by simply pushing a prefabricated pipe. In addition, the through holes in the prefabricated pipes serve as excavated soil discharge routes during propulsion.
After the construction is completed, it will be constructed as a conduit for storing cables, which is extremely efficient and eliminates waste.

Moreover, unlike conventional construction methods of this type, there is no need to first propel a guide pipe with a built-in excavation and discharge means to the destination shaft and then penetrate it, which is superior to conventional construction methods. The work time is dramatically shortened, and at the same time, less labor, effort, and equipment are required, and the work is generally simple.

゛ Furthermore, most of the equipment and equipment required for the work can be used as they are, so there is no waste.

Moreover, the structure of the prefabricated pipe to be newly used is extremely simple and its manufacture is relatively easy, so that the work cost can be reduced, and the practical effects of this invention are high.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a right side view and a front view, respectively, of a prefabricated pipe used in the example, and FIGS. 3 to 5 are explanatory side views showing the construction process according to the example. In addition, in the figure, 1.23.24.39 are prefabricated pipes, 2.3
．． 4.5.6.7.42.43.47 is a through hole, 8.9
．． 10.11.37, Seki and Tochi are connecting holes, 21 is an excavator,
The blade is a sand pump, η is a cutter, 35.36.41
``PCf141flis'' is the starting side shaft, 45 is the main push jack, and 46 is the push ring.

Claims (1)

[Claims] A prefabricated pipe with appropriate through-holes laid in the axial direction that constitutes the cable storage conduit is placed at the rear end of the excavation equipment and the excavation machine equipped with the means for discharging excavated soil, and these are placed inside the starting side of the shaft. The prefabricated pipe is inserted into unexcavated soil from the side, and the rear end of the prefabricated pipe is pushed by a pushing device, and the excavated soil is discharged backward through the through hole of the prefabricated pipe. Every time it is propelled a certain length, another prefabricated pipe is added from the rear. Prefabricated porous pipe propulsion characterized in that the prefabricated pipes are locked to each other by appropriate means while matching each other's through holes, and then pushed again by a pressing device to propel each prefabricated pipe and leave it in the soil. Construction method.