JPH0255677B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to water pipes such as water pipes and sewer pipes,
This relates to a method of burying pipes made of synthetic resin materials, such as air guide pipes, underdrain pipes, and cable protection pipes for electric wires, telephone lines, etc., that have a void that communicates in a spiral manner in the pipe circumferential direction. be.

<Prior Art> Conventionally, construction methods have been used in which pipes made of synthetic resin materials, such as water conduit pipes, cable protection pipes for electric wires, telephone lines, etc., are buried underground. Further, a synthetic resin pipe having a gap spirally communicating in the pipe circumferential direction, which is a pipe to be buried underground in the present invention, was also buried underground.

However, these synthetic resin pipes, both those with and without voids in the pipe wall, were usually buried deep underground at a depth of 600 mm to 1000 mm or more from the ground surface GL. In addition, when connecting the end faces, only the inner circumferences of the pipes should match, that is, they should be concentrically connected. Even if the pipe has a gap in the pipe wall, the position of the gap end face at the connection part should be considered. were not considered at all, and the end surfaces of the gaps were connected in a closed state by disk-shaped packing or the like.

<Problems to be solved by the invention> As described above, the biggest reason why pipes had to be buried deep underground in the past is that when buried near the ground surface, the synthetic resin material used to form the pipes is softened by the heat transmitted from the sun into the ground, especially in the summer, and the pressure deformation strength against external pressure is greatly inhibited, making it impossible to maintain the roundness of the pipe, resulting in a narrowing of the inner area of the pipe due to crushing deformation. This is because problems such as irreversibility due to plastic deformation may occur, resulting in high-temperature softening of the wire sheathing inside the pipe, and furthermore, a decrease in power transmission due to the high temperature of the wire itself.

However, burying it deep underground requires a great deal of effort to form a burial trench, for example.
In order to bury the pipe 100mm deep, it is necessary to make a trench 100mm deep over the entire length of the pipe burying trench, so the probability of encountering rocks, lumps, etc. during this time is extremely high, and rock removal or rock drilling is required for this purpose. The work was not easy. On the other hand, in urban areas, water and sewage pipes, mainly hium pipes and iron pipes, and gas pipes are already buried vertically and horizontally under roads.
The current situation is that it is extremely difficult to bury new pipes between 1000mm and 2000mm.

Therefore, even under such adverse conditions, the inventor of the present invention has overcome the request and necessity of burying pipes underground, has researched an efficient method for burying underground pipes, and hereby discloses the results. This technology is proposed here.

<Means for Solving the Problems> That is, the present invention is a pipe made of a synthetic resin and has a pipe structure in which the pipe wall is formed with corrugations in order to maintain pressure deformation strength. The target is a pipe in which the uneven waveform shape is a spiral waveform, and a spirally communicating gap is formed in the pipe wall by using the uneven waveform part. This allows water to flow inside and prevents the pipe wall itself from becoming too hot, as well as softening the pipe material due to the heat transmitted from the sun into the ground, reducing the pressure deformation strength of the pipe, and preventing the inside of the pipe from becoming too hot. This relates to a method for burying pipes made of

The gist of the method of the present invention will be explained with reference to FIGS. 1, 2, and 5 shown as examples. is buried at a depth such that the outer circumferential surface 3 on the ground side is 200 mm to 400 mm from the ground surface GL in the underground burial position, and the connecting part B between the pipe end of the preceding buried pipe A and the pipe end of the subsequent buried pipe A is buried. , the opening 21 of the gap 2 on the end surface of the preceding buried pipe A and the opening 21 of the gap 2 on the end surface of the next buried pipe A are arranged so as to communicate with each other, and the connecting portion B
In this embedding method, the voids 2, 2 are connected to the inner and outer surfaces of the pipe so as to maintain watertightness.

<Function> In this way, for example, an electric wire or the like is inserted into a pipe buried underground and protected by the pipe. During high-temperature seasons such as summer, water flows into the gap 2 from the end of the tube to prevent the tube from becoming too hot. Further, if necessary, it can also be used to prevent brittle fracture of the tube wall by passing water into the void 2 in the same way during extremely cold weather in cold regions.

<Example> Examples of the present invention will be described below.

Figures 1 to 4 illustrate pipes that are considered to have a typical structure of synthetic resin pipes used in carrying out the present invention, and the pipe materials include vinyl chloride-based synthetic resin materials, polyethylene Although many tubes are made of polyolefin-based synthetic resin materials such as polypropylene, tubes made of other synthetic resin materials may also be used.

In addition, the entire tube wall may be made of a hard synthetic resin material, or the inner tube portion may be made of a soft synthetic resin material and only the outer tube portion may be made of a hard synthetic resin material. good.

The tube A shown in FIGS. 1 and 2 includes an inner tube 11 having a straight tube wall 1, and an outer tube having a corrugated spiral rib 13 having a U-shaped cross section on the outer peripheral surface of the inner tube 11. 12 are integrated, and a gap 2 is formed between the spiral rib 13 of the outer tube 12 and the outer peripheral surface of the inner tube 11.

As a pipe having the same structure as this pipe A, the above-mentioned inner pipe 1 is
1, a structure in which only the inner surface of the helical rib 13 of the outer tube 12 is closed with a membrane (not shown), and a gap 2 is formed between the outer peripheral surface of the membrane and the helical rib 13. There is a tube. The tube referred to in the present invention may have such a structure.

The tube A shown in FIG. 3 has a tube wall 1 having a straight inner tube 11, a straight outer tube 12, and a spiral structure between the walls of both tubes 11 and 12. Bulkhead 1
5, and has a structure in which a void 2 is defined by the partition wall 15.

In the pipe A shown in FIG. 4, instead of the spiral rib 13 having a U-shaped cross section as shown in FIGS. This figure shows a tube formed in a semicircular arc shape.

As described above, the cross-sectional shape of the void 2 according to the present invention is not limited to a rectangular shape, but may be any shape other than a semicircular arc shape, a circular shape, an elliptical shape, a triangular shape, etc. In short, any spirally connected voids that can prevent the pipe wall from becoming too hot during water flow may be used.

The tube A shown in FIG. 4 has a spiral protrusion 16 formed protruding from the inner circumferential surface of the inner tube 11.

Forming the protrusions on the inner circumferential surface of the pipe in this way has the advantage of making it easier to insert cables such as electric wires with less frictional resistance between the pipe and the cable. .

As explained above, as an example of burying underground a synthetic resin pipe having a void 2 in a pipe wall 1 that communicates in a spiral manner along the pipe circumferential direction, as shown in FIGS. 5 and 6, For example, when burying a synthetic resin pipe A with a diameter D'500 mm in the ground, the outer circumferential surface 3 of the pipe A on the ground side will be below the ground surface when buried in the ground.
To bury something at a depth h, which is 300mm from the GL, first dig a trench in the ground with a width of 500mm + α and a depth of h + D, that is, 800mm from the ground GL. Bury pipe A. When burying this pipe A, pre-buried pipe A (left side in the figure)
Pipe end and next buried pipe A′ (right side in the diagram)
At the connection part B with the tube end of the tube, the opening 21 of the gap 2 on the tube end surface of the left tube A and the opening 21' of the gap 2 on the tube end surface of the right tube A' are arranged so as to communicate in series. As illustrated in FIG. 6, a rubber packing material 4 having a communication hole 41 is interposed between these two pipes A and A', and the openings of the two pipes A and A' are inserted through the communication hole 41. The parts 21 and 21' are made to communicate with each other in series, and the gaps 2 and 2 are
When water flows through the tubes, the connecting portion B between the openings 21 and 21' is connected to both the inner and outer surfaces of the pipes A and A' so as not to leak water.

As this water leakage prevention means, in addition to using the packing material 4 as described above, bonding with an adhesive or any other means may be employed.

<Effects of the Invention> As explained above, the present invention is a system in which a synthetic resin pipe is buried in a shallow position underground, that is, at a shallow position where the top surface of the buried pipe is approximately 200 mm to 400 mm deep from the ground surface. Therefore, the trenching work for burying the pipes is extremely easy compared to the conventional deep trenching work, and it is now possible to perform the pipe burying work and the connecting work above ground, making it possible to perform the pipe burying work and the connecting work on the ground. There is no need to widen the width of the groove, especially at the joints of the pipes, because the worker has to go down into the trench to perform the pipe burying and connection work, making the trench creation work even easier. This has the advantage of being easy to install and connect the pipes. Furthermore,
Since the present invention is to bury existing water pipes, existing gas pipes, etc. in the remaining area close to the ground surface, which is the upper part of the buried area, it is suitable for burying work in urban areas where water pipes, gas pipes, etc. are buried vertically and horizontally. However, it has the remarkable advantage of being less hindered by the presence of these existing pipes and making it easier to bury the underground pipes smoothly. However, in the case of high-temperature softening of buried pipes in the summer, etc., by passing water into the void around the pipe, it is possible to prevent the pipe itself from softening and the temperature inside the pipe to rise. It is also possible to expect the effect that electric wires, etc. can be protected without causing a decrease in the power flowing through the electric wires, etc. This has the effect of eliminating the need for burying it deep underground.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the structure of an embodiment of the synthetic resin pipe used in the present invention, Fig. 2 is a vertical cross-sectional end view of the main part of the pipe in Fig. 1, and Figs. 3 and 4 are FIG. 5 is a longitudinal cross-sectional end view of the main parts showing another example structure of a synthetic resin pipe, FIG. 5 is a schematic diagram illustrating the method of embedding a pipe according to the present invention, and FIG. 6 is a perspective view of a connecting portion of the pipe. In the figure, A is a synthetic resin pipe, B is a connecting part, GL is a ground surface, h is a depth, 1 is a pipe wall, 2 is a gap, 3 is an outer peripheral surface on the ground side, and 21 is an opening.

Claims (1)

[Claims] 1. In a method of burying a pipe A made of synthetic resin and having a gap 2 in a pipe wall 1 that communicates in a spiral manner in the circumferential direction of the pipe by making a trench in the ground, Bury the pipe A at a depth h such that the outer circumferential surface 3 on the ground side is 200 mm to 400 mm from the ground surface GL when buried in the ground,
At the connecting part B between the end of the preceding buried pipe A and the end of the next buried pipe A, the opening 21 of the gap 2 on the end surface of the preceding buried pipe A and the opening 21 of the gap 2 on the end surface of the next buried pipe A are connected. The opening 21 is disposed so as to communicate with the opening 21 in series, and in the connecting portion B, the void 2,
A method for burying synthetic resin pipes in the ground, in which the two parts are connected to the inner and outer surfaces of the pipe to maintain watertightness. 2. The synthetic resin pipe A consists of an inner pipe 11 and an outer pipe 12 having corrugated spiral ribs 13 on the outer peripheral surface of the inner pipe 11, and the spiral ribs 13 of the outer pipe 12 and the outer peripheral surface of the inner pipe 11 A method for burying a synthetic resin pipe in the ground according to claim 1, which is a pipe having a structure in which a void 2 is formed between the pipes. 3 Synthetic resin pipe A has corrugated spiral ribs 13
and a membrane body that closes the inner surface of the spiral rib 13 of the tube 12, with a gap 2 formed between the membrane body and the spiral rib 13. A method for burying a synthetic resin pipe in the ground according to item 1. 4. A synthetic resin pipe A is composed of an inner pipe 11, an outer pipe 12, and a partition wall 15 formed between these two pipes, and has a structure in which the pipe wall 1 has a gap 2 defined by the partition wall 15. A method for burying a synthetic resin pipe underground according to claim 1. 5. The method for burying a synthetic resin pipe in the ground according to claim 1, wherein the synthetic resin pipe A is a pipe having a spiral protrusion 16 protruding from the inner peripheral surface of the inner pipe 11. . 6. The method for burying a synthetic resin pipe underground according to claim 1, wherein the inner pipe 11 is made of a soft synthetic resin material and the outer pipe 12 is made of a hard synthetic resin material. 7. The method for burying a synthetic resin pipe underground according to claim 1, wherein both the inner pipe 11 and the outer pipe 12 are made of a hard synthetic resin material.