JP2523381Y2 - Underground propulsion pipe for electric power - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an underground electric power propulsion pipe which is used as an electric conduit and is buried by excavating earth and sand into the excavation hole and excavating the underground excavation hole. The present invention relates to an underground electric power propulsion pipe in which three pipe members are arranged in parallel on a same plane at predetermined intervals with good construction efficiency.

[0002]

2. Description of the Related Art Conventionally, when laying an electric wire underground, the surface of the earth is excavated, a conduit is buried, and a power cable is inserted. Also, if there is a river or obstacles and the ground surface cannot be excavated, excavate standing piles on both sides of the river or obstacle, and connect the both piles with horizontal drilling holes. An underground propulsion pipe is pushed into the excavation hole and buried, and a power cable is inserted through the underground propulsion pipe.

[0003]

[Problem to be Solved by the Invention] When burying an underground propulsion pipe, it is desired that the installation space be as small as possible, and improvement in construction efficiency is expected. In addition, a plurality of underground propulsion pipes are usually buried in the borehole by connecting them in the axial direction. The underground propulsion pipe has a socket externally fitted to one end side of the pipe body, and is protruded and fixed, and the other end side of the adjacent underground propulsion pipe is fitted inside the socket and connected thereto. Since the borehole is excavated slightly larger than the outside diameter of the socket, when the underground propulsion pipe is pushed into the borehole, the outside diameter of the underground propulsion pipe is larger only in the socket part than in other parts However, because the socket hits the borehole wall and breaks the borehole wall, or because there is a gap between the outer diameter of the underground propulsion pipe and the borehole wall, sediment accumulates on the bottom of the borehole from the top of the borehole wall, A phenomenon occurs in which the socket goes up and the underground propulsion pipe gradually bends.

[0004]

In order to minimize the installation space for underground propulsion pipes and to improve construction efficiency, the present invention pushes underground soil into excavation holes formed by discharging earth and sand. An underground propulsion pipe to be buried in which three pipe members, which are externally fitted with and protruded from a PFP socket at one end of a PFP pipe body, are fixed at predetermined intervals and arranged in parallel on the same plane. The outer peripheral surface of the pipe is connected with the urethane foam resin except for the portion fitted inside the socket of the adjacent underground propulsion pipe on the other end side, so that the outer pipes on both sides are equal to the outer diameter of the socket. Underground power propulsion pipe for power

[0005]

[Function] Since three underground propulsion pipes are arranged in parallel on the same plane and integrated with urethane foam resin, the underground propulsion pipes can be buried in a small space and the construction of underground propulsion pipes is efficient. Become. In addition, since the outer periphery of the underground propulsion pipe is covered with urethane foam resin and has the same diameter as the socket, even if the underground propulsion pipe is pushed into the underground drilling hole, it does not break the drilling hole, and after burial Since there is no gap between the excavation hole and the earth and sand falling from the excavation hole, the underground propulsion pipe is not bent.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a power underground pipe according to the present invention. FIG. 1 is a longitudinal sectional view of an underground pipe, and FIG. 2 is a sectional view taken along line II-II of FIG. A PFP socket 2 is externally fitted to one end of the PFP tube 1 and is fixed by protruding. The PFP socket 2
Can be freely formed integrally with the PFP tube 1.

A pipe member in which a PFP socket is externally fitted to one end of the PFP pipe body 1 and protruded and fixed can be used as an underground pipe by not only the push-in method but also the open-cut method. The excavation method is a method of removing earth and sand from the ground surface to a required depth, burying a pipe member there, and backfilling the removed earth and sand. On the other hand, the underground propulsion pipe is buried by pushing the space between the standing piles, and requires a certain strength or more. A PVC pipe or the like is hard to withstand use. Although the iron tube has sufficient strength, it is not suitable for use because when using a power cable, it is magnetized and generates heat and consumes power because it is a magnetic material.

When the underground propulsion pipe is made of PFP, the underground propulsion pipe has sufficient strength for use as an underground propulsion pipe and is a non-magnetic material, so that it can be used for a power cable passing through.
It can also be used as a pipe member by using the open cut method. Here, as the pipe 1 and the socket 2, a PFP pipe, an asbestos cement pipe, a GP, a hard vinyl pipe or a fume pipe can be used, but a PFP pipe is most preferable.

[0009] The PFP tube comprises an inner FRP layer in which glass fibers are rolled in the axial and circumferential directions, an intermediate mortar layer, and an outer FRP layer in which glass fibers are rolled in the axial and circumferential directions. The outer peripheral surface of the tubular body 1 is covered with the urethane foam resin 3 over the entire surface except for a portion 1a which is fitted inside the socket 2 of the adjacent underground propulsion pipe on the other end side so as to be equal to the outer diameter of the socket 2. .

The foamed urethane resin 3 is obtained by mixing a polyol component and a polyisocyanate component at a weight ratio of 100: 100. The composition of the polyol component is as follows: polyether polyol, foam stabilizer (silicone-based), catalyst (tertiary amine-based), water, CFC-11 pigment (post-addition)
In, a viscosity cps20 ℃ 1000~1600, in liquid density D ₄ ²⁰ 1.070
~ 1.080.

[0011] The composition of the polyisocyanate component is a polymeric Socia sulfonates, 150-400 viscosity Cps20 ° C., it is from 1.235 to 1.255 in liquid density D ₄ ^20. The molding properties of the foamed urethane resin 3 are as follows: molded article density: 0.30 g / cm ³ , compressive strength
70 kg / cm ^{2 according to} ASTMD1621 standard, 90 kg / c according to flexural strength DIN standard
m ² , tensile strength 50kg / cm ^{2 in} JIS K6911 standard, elongation 5
%, Izod impact strength 3.5kg ・ cm / c according to ASTM D256 standard
m ² , Shore D surface hardness is 55 according to ASTM D2240 standard, and thermal expansion coefficient is 60 × 10 ^-6 ° C at -50 to + 50 ° C.

The underground propulsion pipe shown in FIGS. 1 and 2 is mechanically pushed into a borehole formed by discharging earth and sand from the ground. Since the underground propulsion pipe has the same outer diameter as the socket 2 and other parts, it does not break the wall of the borehole,
After the underground propulsion pipe is buried, there is no gap between the underground propulsion pipe and the wall of the excavation hole, so that sediment does not fall from the excavation hole and bend the underground propulsion pipe.

The urethane foam resin 3 covering the outer peripheral surface of the cylindrical body 1 is light, has strength, does not deteriorate in the ground, and is suitable for being propelled and embedded in the ground. In the present invention, three rows of underground propulsion pipes arranged in parallel on the same plane are buried in order to eliminate underground space waste and increase construction efficiency. In the present invention, three underground propulsion pipes shown in FIGS. 3 and 4 are arranged in parallel on the same plane. Socket at three pipe ends
A tube 11 to which 12 is fixed is arranged in parallel, and is integrally formed with a urethane foam resin 13. Since it is exactly the same as that described above, it is indicated by a code obtained by adding 10 to the code of FIGS.
Duplicate description is omitted.

[0014] As shown in FIG.
It can be integrated as a whole, and further, as shown in FIG. 5, it can be formed as a series of circular portions.

[0015]

The present invention relates to an underground propulsion pipe which is buried by excavating earth and sand from the ground as described above and excavating it into a drilling hole, wherein a PFP socket is provided at one end of a PFP pipe body. The three pipe members which are externally fitted and protruded and fixed are arranged in parallel on the same plane at predetermined intervals, and on the outer peripheral surface of the pipe body,
Except for the part that fits inside the socket of the adjacent underground propulsion pipe at the other end, it is connected with urethane foam resin and the outer pipes are covered so that the outer diameter of the socket is equal to the outer diameter of the socket. Since it is a propulsion pipe, the space for installing the underground propulsion pipe is saved, and construction efficiency is significantly improved.

Further, the underground propulsion pipe of the present invention can be provided easily and inexpensively because the pipe member used for the open-cutting method is simply covered with urethane foam resin so as to have the same outer diameter. Further, as described above, the present invention relates to an underground propulsion pipe which is buried by excavating earth and sand in the ground and excavating the excavation hole, wherein a PFP socket is provided at one end of the PFP pipe body. The outer diameter of the socket is made of urethane foam resin over the entire surface except for a portion that fits inside the socket of the adjacent underground propulsion pipe on the other end side on the outer peripheral surface of the pipe body of the pipe member that is fitted and projected and fixed. Since it is a power underground propulsion pipe coated so that it does not break the drilling hole even if the underground propulsion pipe is pushed into the underground drilling hole, and since there is no gap between it and the drilling hole after burial, There is no such thing as earth and sand falling from the borehole and bending the underground propulsion pipe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an underground electric power propulsion pipe.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a vertical sectional view of the underground electric power propulsion pipe according to a specific embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view of another example of FIG. 3;

[Explanation of symbols]

 11… Tube 12… Socket 13… Urethane foam resin

Claims (1)

(57) [Scope of request for utility model registration] 1. An underground propulsion pipe which is buried by pushing an excavation hole formed by discharging earth and sand from the ground, wherein a PFP socket is externally fitted and protruded from one end of a PFP pipe body to be fixed. The three pipe members are arranged in parallel on the same plane at predetermined intervals, and foamed on the outer peripheral surface of the pipe body except for a portion which fits in the socket of the adjacent underground propulsion pipe on the other end side. An underground electric power propulsion pipe connected with urethane resin and coated on both outer pipes so as to have the same outer diameter as the socket.