JPH10185016A - Multiple stripes of pipes to be buried underground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide multiple stripes of pipes to be buried under-ground, where no pipe is suffered from deflection and damages caused by back filling soil, irregular depression and the like, and the aforesaid pipes can be easily and surely back filled again. SOLUTION: When pipes 2, 2 and 2 to be buried while being located in the upper stage, pipes 3, 3 and 3 to be buried while being located in the middle stage, and pipes 4, 4 and 4 to be buried while being located in the lower stage, are held in parallel at specified intervals in all direction, and are bound over their outer circumference with a binding band 7 so as to be formed into the multiple stripes of the pipes 1 to be buried underground, each gap formed between spacers in the axial direction of the respective pipes 2, 3 and 4 to be buried in the vertical direction, is blocked by each filling member 6 thick in thickness and wide in width as specified, and the circling motion of soil around each gap is made unnecessary when soil is back filled, and each pipe to be buried is thereby prevented from being deflected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground multi-stripe pipe comprising a plurality of burial pipes for burying cables for electric power and communications in the ground.

[0002]

2. Description of the Related Art A buried pipe for burying a cable for power and communication in the ground is formed by connecting an end of the buried pipe of a required length to a long length using a socket.
Using a plurality of spacers (also called nozzles) formed of resin concrete, ceramic, etc.
The spacers are held in parallel at a predetermined interval in the left-right direction, and a plurality of buried pipes, which are held at intervals by the spacers, are bound by a binding band or the like to form a multi-row pipe. Spacers for forming this multi-row pipe are arranged at required intervals in the longitudinal direction of the burying pipe, and the left and right spacing maintenance by the spacer is to minimize the width of the buried trench to be excavated. , Is set to be approximately 10 mm to 20 mm.

[0003] A multi-strand pipe of a required length obtained by focusing and connecting a plurality of buried pipes at predetermined intervals in the vertical and / or horizontal directions using such spacers by using a band. Is installed in the buried groove, and if necessary, further connects the multiple pipes in the longitudinal direction with a socket,
After passing power and communication cables through the inside, earth and sand are buried in the buried trench to cover the soil.

[0004]

When soil is covered by an underground multi-stripe pipe installed in a burial groove, the interval between the left and right buried pipes constituting the multi-stripe pipe is 10 to 20 m as described above.
Since the interval is extremely narrow, such as m, the earth and sand for backfilling often do not sufficiently spread in the gaps between the buried pipes when covering the soil.

[0005] For this reason, it has been practiced to push the covered earth and sand between the burying pipes using a veneer having a spatula-shaped tip like a paddle. However, the burying pipes are vertically arranged in multiple stages. If the pipes are tied together, a sufficient amount of earth and sand is not filled between the buried pipes, and the filling operation is extremely complicated, so that the construction period is extended.

In order to solve such a situation, it is only necessary to use fine sand such as river sand as the sand used for backfilling. However, such river sand is expensive and therefore must be used in practice. In many cases, the space between the buried pipes is not sufficiently filled with earth and sand and is left as a space.

On the other hand, since the multi-strand pipe is held by spacers arranged at a predetermined interval in the longitudinal direction, especially the buried pipes located at the upper and lower positions have an interval between the arranged spacers. As the gravity causes the central part to deflect downward, the soil can be filled between the left and right buried pipes when covering the soil, but the earth and sand can be filled between the upper and lower buried pipes. Is almost impossible, leaving a lot of space. As a result, the horizontality of the buried pipe cannot be ensured, and a trouble occurs when a cable is inserted into the buried pipe, and the work efficiency of cable laying is reduced.

[0008] In addition, in the multi-tube, a plurality of buried pipes of a required length are previously bound in a factory or a work place, transported to a construction site while keeping this state, stored and used as necessary. It is said that long buried pipes have a bending habit between spacers during transportation and storage, and it is necessary to correct the bending during cable laying and burying work. There are also complications.

[0009] Further, the biggest problem of such multi-walled pipes is that earth and sand are not filled between the buried pipes located in the vertical direction between the spacers. Is that the buried pipe bends after the earth covering, and gradually causes land subsidence.

The present invention has been made in view of the above situation, and as a result of intensive studies, it has been found that the space between the upper and lower buried pipes between the spacers arranged in the longitudinal direction of the long buried pipe is filled with a filling member. Easily and reliably backfill earth and sand at low cost by eliminating the part, providing a multi-story underground pipe that eliminates problems such as uneven settlement of the ground, bending of the burial pipe, and damage. It is something you want to do.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of buried pipes having a required length are vertically and / or vertically and horizontally driven by spacers. At the time of forming a multi-strand tube by holding the bundle in parallel with a predetermined interval, closing the gap of the vertical burying pipe generated between the axial spacers with a filling member having a required thickness and width. It is a multi-stripe for underground burial characterized by becoming.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
A gap formed between the spacers of the buried pipes in the vertical direction among the plurality of buried pipes bundled at a predetermined interval by the spacer and the binding band is filled with the filling member.

The filling member fills the gap formed between the upper and lower buried pipes, and the contact surface of the filling member in contact with the outer peripheral surface of the buried pipe may contact the upper or lower half arc surface of the buried pipe. However, when the filling members are arranged above and below the burying pipe, the entire peripheral surface of the burying pipe is covered by the upper and lower filling members. However, covering the entire peripheral surface of the burying pipe with the filling member increases the size of the filling member itself, increases the weight, and thus increases the cost and the weight of the multi-stripe when actually filled. Therefore, the cable laid in the buried pipe also generates some heat, which is not preferable from the viewpoint of the heat radiation effect.

On the other hand, if the contact surface between the filling member and the burying pipe is small, an extremely good effect can be obtained in terms of heat radiation effect, but the load at the time of covering soil cannot be sufficiently supported. In order to cause the buried pipe to bend, it is preferable to make contact within a certain range.

Therefore, the inventor conducted various experiments on the extent to which the outer peripheral surface of the buried pipe and the outer peripheral surface of the filling member should be in contact with each other. One-third to one-third of the circumference of the upper or lower half of the buried pipe
It has been found that if the length is within the range of 6, the filling member is most stably held between the upper and lower buried pipes, and a heat radiation effect can be exhibited.

More specifically, as shown in FIG. 5, the pipe top P of the buried pipe is centered on the axis O of the buried pipe P.
₁ or the contact angle θ in the direction of the pipe bottom P ₂ is 60 ° to 120 °
It is preferable that the outer peripheral surface in the range described above is in contact with the contact surface of the filling member. Expressing this as a relational expression,
The contact angle θ is 60 ° ≦ θ ≦ 120 °. When the contact angle θ between the filling member and the burying pipe is 60 ° or less, the filling member to be filled between the upper and lower burying pipes is not stably held, and the load during soil covering is sufficiently supported. Therefore, land subsidence cannot be effectively prevented, and the buried pipe may be bent or damaged. When the contact angle θ exceeds 120 °, the heat radiation effect is significantly reduced and the weight of the filling member itself increases, which is not preferable.

Each of the buried pipes constituting the multi-row pipe is a pipe made of a synthetic resin having a predetermined pipe diameter and length made of vinyl chloride resin, polyethylene, polypropylene, polyurethane, FRP, or the like. In addition to ordinary pipes whose inner and outer peripheral surfaces are flat, so-called corrugated pipes with regularly formed independent irregularities in the outer surface in the circumferential direction, or independently formed irregular irregularities on the inner and outer peripheral surfaces Corrugated tubes and the like can also be used.

As the material of the spacer, a hard forming material such as resin concrete, plastic or ceramic is used, and the filling member interposed between the upper and lower burying pipes does not need to demand performance such as strength. A recycled product of waste plastic or used foamed polyethylene can be appropriately molded and used. In addition, a metal band or a plastic band can be appropriately used as a binding band for binding the respective burying pipes.

In the case where the filling member is applied to a buried pipe having a smooth outer peripheral surface by forming concave grooves at predetermined intervals in the width direction on a contact surface in contact with the outer peripheral surface of the burying pipe. The concave groove forms a heat radiating surface, so that a more effective heat radiating effect can be exhibited. In addition, when the present invention is applied to a corrugated pipe having independent concave portions and convex portions on the outer peripheral surface, a concave groove formed in the filling member serves as a guide for positioning, and the convex portion of the buried pipe is engaged with the concave groove. In addition, practical effects such as no displacement of the buried pipe during backfilling of the multi-row pipe can be expected.

[0020]

The underground multi-stripe pipe according to the present invention is a multi-stripe pipe obtained by focusing and connecting a plurality of burial pipes with a spacer and a binding band while maintaining a predetermined interval between up and down or up and down and left and right. When forming, the space between the embedding pipes located in the up-down direction is filled with the filling member having a required shape, so that the vertical gap generated in the multi-strand pipe is eliminated.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of an underground multi-layer pipe according to the present invention. As shown in FIG. 4, the underground multi-strand pipe 1 of the present invention comprises nine burial pipes 2, 3, and 4 having a required length and diameter, three vertically and three horizontally. Each of the buried pipes 2, 3, and 4 is arranged on the outer peripheral surface so that they are arranged in parallel at equal intervals.
The four resin concrete spacers 5 each having four recesses engaging with the outer peripheral surface of the resin are arranged so as to have a substantially rectangular cross section, and the spacers 5 are equally spaced three by three in the vertical and horizontal directions. 9 are buried in a metal bundle band 7 to form a multi-strand pipe.

Each of the buried pipes 2 and 3 constituting the multi-row pipe 1
And 4 are made of polypropylene having a pipe diameter of 75 mmφ (nominal diameter) and a length of about 4 m. It is held to be about 20 mm. Although not shown, each buried pipe 2, 3, and 4
By using a pipe whose diameter is expanded to a predetermined inner diameter so that it can accept the pipe end of the buried pipe that connects one of the pipe ends, or by using an inner diameter that is almost the same as the outer diameter of the buried pipe. It can be connected to a desired length by using a socket having a required length, and spacers are usually provided at intervals of about 2000 mm.

The vertical spacing of these buried pipes 2, 3 and 4 depends on the thickness of the spacer 5 to be used, but in the embodiment, a gap of about 20 mm is formed between them. Therefore, in the gaps X, X... Formed by the upper and lower gaps, the filling members 6, 6... Thereby, each gap X, X
... is closed.

As is particularly apparent from FIG. 1, the filling member 6 has an arc-shaped cross section in which both end edges in the width direction are adjusted to the outer diameters of the upper and lower embedding pipes 2, 3 and 4.
The thickness Y of the filling member 6 as shown in FIG. 5, the contact surface of the arcuate section of the filling member 6 in contact with the outer peripheral surface of the Kan'itadaki portion P ₁ or Kansoko portion P ₂ of the buried pipe P, burying pipes P
Axis contact angle O to the center to Kan'itadaki portion P ₁ or Kansoko portion P ₂ direction of buried pipe P to θ of is configured to contact an outer peripheral surface in the range of 60 ° to 120 °.

Each of the vertical buried pipes 2, 3 and 4
When this is buried underground, the presence of the filling member 6 causes the backfilled earth and sand to be buried in each of the burial pipes 2, 3 and 3.
There is no need to wrap around between the pipes, and it is only necessary to load and compact the earth and sand into the gaps between the sides of the buried pipe in the vertical direction. As a result, the earth and sand is sufficiently compacted, and there is no land subsidence. Troubles such as breakage of the tube due to increase in bending or stress are solved by this.

In the above embodiment, a normal pipe having a flat inner and outer peripheral surface is used as a buried pipe applied to a multi-stroke pipe, but the buried pipe is not limited to the above embodiment. A corrugated pipe having regularly formed independent concavo-convex strips on the outer peripheral surface, or a corrugated pipe having independently formed concavo-convex strips regularly on the inner and outer peripheral faces may be used.

The filling member is, as shown in FIG.
By using concave grooves 6a, 6a,... Having a required width in the width direction at required intervals on a contact surface having an arc-shaped cross section in contact with the outer peripheral surface of the buried pipe, the outer peripheral surface is flat. In a buried pipe, each groove 6a functions as a hole for heat dissipation, and in a corrugated pipe, each groove 6a can be used as a positioning hole.

The spacer is not limited to the above-described embodiment. For example, a plurality of (two to three) spacers having a semicircular tube holding portion on the inner side are provided. A pair of upper and lower spacers that can hold a plurality of burying pipes substantially in parallel by holding the side surfaces may be used by vertically and horizontally.

[0029]

The underground multi-stripe pipe according to the present invention is a spacer pipe between vertical embedding pipes of a plurality of embedding pipes bundled with a predetermined interval maintained by a spacer and a binding band. Is filled with a filling member. When backfilling a multi-pipe filled with such a filling member and equipped with a cable in each buried pipe, it is not necessary to circulate the earth and sand directly under this vertical buried pipe, and It is only necessary to put the earth and sand on both sides of the pipe and compact it, there is no need to select special sand for backfilling, it is possible to quickly and surely backfill, and there is no uneven settlement of the ground .

In particular, since the space between the buried pipes in the vertical direction is supported by the filling member, the deformation and bending of the multi-strand pipe are reduced.
Without breakage, etc., the work efficiency can be greatly improved.Furthermore, since this filling member supports each buried pipe in the vertical direction so as not to bend, it is possible to transport the multi-row pipe. Even during storage, the bending habit of each buried pipe does not occur.

In the filling member, the contact surface of the filling member in contact with the outer peripheral surface of the burying pipe is formed at an angle of 60 ° to the top or bottom of the pipe from the center point of the burying pipe.
By limiting the outer peripheral surface within the range of 120 °, the engagement between the burying pipe and the filling member is ensured, and while maintaining good dissipation of heat generated in the burying pipe, the soil This has many practical advantages, such as easy and reliable tamping.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a multi-stripe for underground burial according to the present invention.

FIG. 2 is a longitudinal sectional view of the multi-stripe for underground burial of the present invention.

FIG. 3 is an AA end view of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is an explanatory diagram for explaining calculation of a thickness of a filling member.

FIG. 6 is a partially cutaway perspective view showing another embodiment of the filling member used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground burial pipe 2, 3, 4 Burial pipe 5 Spacer 6 Filling member 7 Binding band X Void Y Filling member thickness

Claims (3)

[Claims] When a plurality of buried pipes having a required length are bundled and held in parallel at predetermined intervals in the vertical and horizontal directions by spacers to form a multi-strand pipe, An underground multi-stripe pipe characterized in that a gap of a vertical pipe to be buried between spacers is closed by a filling member having a required thickness and width. 2. The contact surface of the filling member in contact with the outer peripheral surface of the burying pipe is an outer peripheral surface having an angle from the center point of the burying pipe to the top or bottom of the pipe within a range of 60 ° to 120 °. The underground multi-stripe pipe according to claim 1, wherein: 3. The filling member according to claim 1, wherein a groove is formed on a contact surface in contact with an outer peripheral surface of the burying pipe at a required interval in a width direction. Multi-row pipe for underground burial.