JP2733741B2 - Perforated pipe for piping inside the pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for piping a perforated pipe into a fume pipe or the like buried underground and a perforated pipe.

[0002]

2. Description of the Related Art Conventionally, transmission and distribution line facilities have generally been overhead transmission systems supported by steel towers and utility poles in terms of cost, but in recent years, urban landscapes have been improved, disaster prevention functions have been strengthened, and fires and storms have occurred. Underground disasters have been gradually progressing in an effort to provide a stable supply of power and effective use of road space in the event of a disaster such as the following.

[0003] There are two types of underground construction methods: open-cutting and tunneling. Of these, pipes are to be promoted in tunneling methods at crossing trunk facilities or on public roads with large earth cover and heavy traffic. And buried propulsion method (Tokuhei 5-81)
However, this propulsion method involves connecting a perforated pipe to the rear of the excavator and propelling it, and burying the perforated pipe directly in the ground. There is a problem in that the perforated pipe rolls due to the rotational reaction force of the plate, and the cable conduit in the perforated pipe is spirally bent.

In addition, since the cable conduit in the perforated pipe is also used as a feed / discharge conduit, there are many problems such as the surface of the cable conduit being roughened, which hinders the insertion of the cable. In need of.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks, and is intended for rolling a porous pipe having a plurality of cable holes formed in a fume pipe buried underground. Another object of the present invention is to develop a method for preventing the surface of the cable conduit from being roughened and a porous tube suitable for the method.

[0006]

According to a preferred embodiment of the present invention, a pipe is buried in the ground and water is retained in the pipe, and each porous pipe is sequentially placed in the water. After insertion / propulsion or withdrawal, a method of piping a perforated pipe into a pipe characterized by filling the gap between the pipe and the perforated pipe with a filler such as mortar, It is desirable to attach a shielding plate to the front end of the most advanced perforated pipe. As a perforated tube suitable for realizing this method, the lower half part in the cross-sectional direction of a cylindrical body having a large number of holes into which cables are inserted in the axial direction is formed heavier than the upper half part, Alternatively, the total cross-sectional area of each cable hole formed in the perforated tube is formed such that the lower half is smaller than the upper half, and furthermore, both end portions of each cable hole formed in the perforated tube are Each of the projections is formed in a tapered shape, and furthermore, on the outer peripheral surface of the lower half portion of the perforated tube, at a position more uniform than the lower end portion of the perforated tube, a projection for maintaining a distance from the fume tube is formed.

[0007]

The operation of the present invention will be described below. Water is retained in a pipe buried underground, and a perforated pipe is sequentially inserted, propelled, or drawn into the water to excavate during propulsion of the perforated pipe. Since no rotating machine is used, there is no rotation reaction force acting on the perforated tube, which has the effect of preventing the perforated tube from rolling.In addition, the perforated tube receives light buoyancy due to stagnant water, reducing frictional resistance with the tube. Has the effect of reducing propulsion. Further, since the lower half of the cross section of the columnar body having a large number of holes formed therein is heavier than the upper half, there is an effect that the upper half is always positioned upward in water and does not roll, and By forming the total cross-sectional area of each cable hole formed in the perforated pipe smaller in the lower half than in the upper half, the upper half is made lighter to stably prevent rolling, and By expanding both ends of each cable hole formed in the perforated pipe in a tapered shape, the cable is not caught when inserting a transmission line into the cable hole, and at a position more uniform than the lower end of the perforated pipe, Since the projection has the projection for maintaining the gap with the pipe, the propulsion resistance is reduced and the perforated pipe is positioned at the center of the pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 2 to 4, a perforated pipe 4 is a concrete cylinder having a fixed length, and a plurality of cable holes 7a extending between both ends thereof. , 7b, 7c, 7d extend in parallel with each other in the axial direction. Both ends are open toward the end face in a bell mouth shape. The cable holes 7 may be formed by connecting pipes 8 formed in bell mouths to both ends of a vinyl chloride pipe and embedding a plurality of cable pipes in concrete. Further, an asbestos pipe, a ceramic pipe, a steel pipe, or the like may be used instead of the vinyl chloride pipe. These cable pipes have different hole diameters according to the thickness of the transmission line wired inside, and the cable hole for wiring a thick transmission line increases the distance between adjacent cable holes. Is desirable.
As shown in FIG. 4, the arrangement of these cable holes in the cross section of the perforated pipe is such that the total cross-sectional area of each of the cable holes 7a, 7b, 7c, 7d is smaller in the lower half 4A than in the upper half 4B. The apparent specific gravity of the upper half 4B of the lower part 4 is smaller than that of the lower half 4A. That is, the upper half 4B is replaced with the lower half 4
It is formed lighter than A. Even if the upper half 4B is not made lighter than the lower half 4A by arranging the cable holes, the cable holes are evenly arranged in the cross section of the perforated pipe, the upper half of the perforated pipe is made of lightweight concrete, and the lower half is formed of a lightweight concrete. You may make it form with ordinary concrete. As a material used for forming the porous tube, foamed mortar, foamed concrete, lightweight concrete, ordinary concrete, resin and the like are used.

Reference numeral 10 denotes an injection pipe made of a vinyl chloride pipe located at the top of the cross section of the perforated pipe and extending through both ends of the perforated pipe. At one end, a protruding portion 10a protrudes from the end face of the perforated pipe, and at the other end, a sleeve 10b fitted with the protruding portion 10a of the opposing perforated pipe is buried so as to be flush with the end face of the perforated pipe. Reference numeral 10c denotes a filler discharge port which communicates with the injection pipe 10 and opens on the outer peripheral surface of the porous pipe. 10d is a cushion material wound around a fixed length portion of the injection tube 10 embedded in the perforated tube on the side of the protruding portion 10a, and the injection tube can be used even when the protruding portion is fitted to the sleeve 10b of the opposing perforated tube. It is designed to exhibit flexibility.

Reference numeral 12 denotes a connecting step peripheral portion formed by cutting out the outer peripheral surface of the end portion of the perforated tube 4. Reference numeral 13 denotes a steel collar whose outer shape is substantially the same diameter as the perforated tube 4. Is fitted to and fixed to the outer periphery of the end portion, and the rear half portion is projected rearward. The steel collar 13 is fitted to the connecting step peripheral portion 12 of the perforated tube opposed to the steel collar 13 via the rubber ring 12a. Reference numeral 14 denotes a cushioning material adhered to one end surface of the perforated pipe except for the cable hole, so that the perforated pipes come into close contact with each other when they are connected to each other. Reference numeral 15 denotes vertical and horizontal reinforcing bars disposed at the outer edge of the perforated pipe. 1
Reference numeral 1 denotes a connecting pin protruding from one end face of the perforated pipe, which is fitted into a pin hole 11a provided on the other end face of the opposing perforated pipe to align the cable holes with each other and to accurately communicate with each other. Things. Further, reference numeral 9 denotes a lower half outer peripheral surface of the perforated tube 4, which is a sled-shaped projection at an even position on the left and right from the lower end portion X of the outer perforated tube to maintain an interval with the fume tube 1. The protrusions 9 may be provided at one place or two places before and after in the perforated tube, and may be protrusions or rollers extending back and forth.

In order to insert such a perforated pipe 4 into a fume pipe, as shown in FIG. 1, a starting shaft is dug in one of the construction sections, and a reaching shaft is dug in the other of the sections. The excavator is mounted on the fume pipe 1a, and while excavating the ground with the excavator, a plurality of fume pipes 1b, 1c... It is buried from the starting shaft to the reaching shaft by pressing. In this case, prior to the pressing of the fume pipe 1, a ring packing 3 for a fume pipe entrance is attached to the starting shaft side entrance so that groundwater in the ground does not flow into the shaft from the outer periphery of the fume pipe 1.

The opening end of the fume pipe 1 on the reaching shaft side is closed by a shielding plate 2 having a water supply pipe 2a and a drain pipe 2b communicating with a water tank provided on the ground. On the other hand, a perforated pipe well ring packing 5 for stopping water in a gap between the inner circumference of the fume pipe 1 and the outer circumference of the perforated pipe 4 to be inserted is attached to the opening end on the starting shaft side. Next, the fume tube 1 is held by the packing 5 in a watertight manner at the tip end of the perforated tube 4b having a closing plate 4a for closing each cable hole 7 of the perforated tube 4b at the end (on the side where the step peripheral portion is provided). , The propulsion jack A is extended, and the perforated tube 4b is inserted into the fume tube 1 through the pressing ring D abutting against the rear end (the side provided with the steel collar) of the perforated tube 4b, leaving the rear end. Insert.

Thereafter, water is supplied from the above-mentioned water tank into the fume pipe 1 through the water supply pipe 2a, and is filled with water. At this time, the air in the fume pipe 1 is discharged from the drain pipe 2b.

Next, the stepped peripheral side of the subsequent perforated tube 4c is fitted and connected to the steel collar of the front perforated tube 4b. At this time, the pin 11 of the front perforated tube 4b is fitted into the pin hole 11a of the perforated tube 4c, and the stepped portion and the steel collar are watertightly connected by the rubber ring 12a. This is repeated, and the subsequent perforated pipes 4c, 4d,... Are sequentially connected to the perforated pipe 4b, and are pressed by the propulsion jacks A via the respective press rings D, while draining the water in the fume pipe from the drain pipe 2b. , Fit over the entire length of the fume tube.

Thereafter, the gap between the fume pipe and the perforated pipe is filled with a filler 6 such as mortar through an injection pipe 10 and a discharge port 10c provided in the perforated pipe, so that the fume pipe 1 buried in the ground is filled with pores. A pipe 4 is provided. At this time, if the projections 9 are provided on the perforated pipe, the surface of the perforated pipe or the fume pipe is not damaged, and the propulsion resistance is reduced.

Further, the cable hole may be closed by a pressing ring D applied to the rear end of the perforated tube without providing the closing plate 4a on the foremost perforated tube 4b. Furthermore, the obstruction plate 4a is simply provided on the most advanced perforated pipe, but if an oblique member inclined toward the front is attached to the obstruction plate, the inclined member serves as a guide to form irregularities on the inner surface of the fume tube. Even if there is, the perforated tube can be inserted without being caught. Further, the perforated pipe is pushed and pushed / inserted into the fume pipe from the rear end by a propulsion jack, but may be pulled from the reaching shaft side by a wire or the like. B is a propulsion cradle in which the pressing wheel D travels back and forth with the expansion and contraction of the propulsion jack, and C is a reaction wall of the propulsion jack.

[0017]

According to a first aspect of the present invention, a pipe is buried in the ground, and the pipe is filled with water, and each perforated pipe is sequentially inserted, propelled, or drawn into the water. Thereafter, since the gap between the pipe and the perforated pipe is filled with a filler such as mortar, an excavator is not used when propelling the perforated pipe, so that no rotational reaction force acts on the perforated pipe and the perforated pipe does not roll. In addition, the perforated pipe is lightened by the buoyancy, the frictional resistance with the fume pipe is reduced, and the propulsion force can be reduced.

According to a second aspect of the present invention, since a shielding plate is attached to the front end of the perforated pipe to be sequentially inserted and propelled, water does not enter the cable pipe, and the perforated pipe can be further lightened. Propulsion resistance can be reduced.

According to a third aspect of the present invention, the lower half portion in the cross-sectional direction of the cylindrical body having a large number of holes into which the cables are inserted in the axial direction is formed to be heavier than the upper half portion. The upper half is located above and does not roll.

According to a fourth aspect of the present invention, since the total cross-sectional area of each cable hole formed in the perforated tube is smaller in the lower half than in the upper half, the upper half is lighter and does not roll.

According to a fifth aspect of the present invention, both ends of each cable hole formed in the perforated tube are tapered so as to be expanded.
When inserting the power cable into the cable hole, it does not get caught at the connection of the perforated pipe.

According to a sixth aspect of the present invention, since a projection for maintaining a gap with the fume tube is formed on the outer peripheral surface of the lower half portion of the perforated tube at a position even from the lower end of the perforated tube, the propulsion resistance is reduced. At the same time, the perforated tube can be positioned at the center of the fume tube.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of a perforated tube of the present invention.

FIG. 3 is a cross-sectional view showing one embodiment of a perforated tube of the present invention.

FIG. 4 is a transverse sectional view showing another embodiment of the perforated tube of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hume pipe 2 Blocking plate 3 Hume pipe wellhead ring 4 Perforated pipe 5 Perforated wellhead ring 6 Filler 7 Cable hole 8 Bellmouth pipe 9 Protrusion 10 Mortar injection pipe 10a Protrusion part 10b Sleeve 10c Discharge port 10d Cushion material 11 pin 11a pin Hole 12 Step circumference 12a Rubber ring 13 Steel collar 14 Cushion material 15 Reinforcing bar

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akinori Fujita 2-3-3, Ishio, Minami-ku, Hiroshima, Hiroshima Prefecture Inside Chuden Engineering Consultants Co., Ltd. (72) Inventor Kazumi Mine, Ishio, Minami-ku, Hiroshima, Hiroshima 2-3-3, Chuden Technology Consultant Co., Ltd. (72) Inventor Katsutoshi Sato 4-33, Komachi, Naka-ku, Hiroshima-shi, Hiroshima Chuden Building No. 2 Building, China High Pressure Concrete Industry Co., Ltd. (72) Inventor, Naofumi Maeda Chuo Building No.2, No.33, Komachi, Naka-ku, Hiroshima-shi, Hiroshima Pref. Building No.2 (72) Inventor Yoshito Takahata 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi, Osaka 72) Inventor Masami Momoda 2-2-2 Matsuzakicho, Abeno-ku, Osaka City, Osaka Prefecture Inside Okumura Gumi Co., Ltd. (72) Inventor Yoshio Sasaki Dai (14) Shin-Koriyama 2-14-301, Ibaraki-shi, Tofu (72) Inventor Toru Tomie 1-4-4, Mukoyo-cho, Higashinada-ku, Kobe-shi, Hyogo 127-805 (56) References JP-A-6-159552 (JP, A) Kaisho 63-280985 (JP, A)

Claims (4)

(57) [Claims] 1. A tubular body characterized in that a lower half portion in a cross-sectional direction of a cylindrical body having a plurality of cable holes into which cables are inserted in an axial direction is formed heavier than an upper half portion. Perforated pipe to be plumbed. 2. The perforated pipe according to claim 1, wherein a total cross-sectional area of each cable hole formed in the perforated pipe is smaller in a lower half portion than in an upper half portion. 3. The perforated pipe according to claim 1, wherein both ends of each cable hole formed in the perforated pipe are tapered. 4. A projection formed on an outer peripheral surface of a lower half portion of a perforated tube at a position more uniform than a lower end portion of the perforated tube to maintain a distance from a fume tube. Perforated pipe to be piped inside the pipe.