JPH11215676A - Underground embedding method for tubular body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground embedding method for a tubular body, which can attain very prompt and easy work for embedding tubular bodies in an underground area, and hardly generates a ground subsidence phenomenon after an embedding process. SOLUTION: One of methods includes the following: stacking a tubular body P whose tube wall 1 is formed into an irregular shape in an axial direction with the cross-section shape of a protruding part 2 being a rectangular shape, and the cross-section shape of a recessed part 3 being a circular shape, inside a groove G formed by excavating the ground in a plurality of lines and stages to conduct tubing into a block B shape, covering the upper surface and both side surfaces of the block B with a water impermeable sheet (s), and back-filling and covering the groove G with soil. The other one involves tubing another tubular body P in a single stage on the block B covered with the impermeable sheet (s), and back-filling and covering the groove G with soil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, four, six, nine, synthetic resin tubes for inserting and storing optical fiber cables, power lines, telephone lines and the like therein for protection.
The present invention relates to a method of burying a pipe in the ground where a required number of pipes, such as 12 and 16 pipes, are stacked in a plurality of rows and a plurality of steps in a trench excavated on the ground and are piped in a block shape to be used as a perforated pipe.

[0002] In the tube according to the method of the present invention, the tube wall is formed in an uneven shape in the axial direction, the cross section of the convex portion is formed in a square shape, and the cross section of the concave portion is formed in a circular shape. A synthetic resin tube having a formed shape, which is intended for such a tube.

[0003]

2. Description of the Related Art Conventionally, a general spiral spiral tube made of synthetic resin, in which a tube wall has a spiral uneven shape, and a cross section of both a convex portion and a concave portion is formed in a circular shape, is buried in the ground for electric wire. It is widely known that it is used as a protective tube or a water pipe. Also,
A plurality of such circular helical pipes are piped in parallel, and in many cases, they are piped in parallel in one row in a horizontal row. However, these pipes are converged by a connecting bracket at predetermined intervals in the length direction. Means for forming a perforated conduit that can maintain a stacked state in a plurality of stages are already known.

On the other hand, as shown in FIG. 2, a synthetic resin tube having a tube wall shape of an annular uneven shape, a convex portion having a rectangular cross section, and a concave portion having a circular cross section. (Hereinafter, this is referred to as a specially-shaped uneven tube) has already been filed by the applicant of the present applicant (Japanese Patent Application Laid-Open No. 8-219333).
Reference).

[0005]

However, in the case of the above-mentioned circular helical pipe, it is easy to rotate in the circumferential direction when piping, and the positional stability is poor. In forming, the sediment enters between the pipes, the straightness is disturbed, and it is easy to meander.In the work of inserting cables etc., when the pipe is meandering, the wiring resistance is significantly large. Therefore, there is always a problem that the work is difficult.

[0006] The present invention focuses on the problems of such a conventional general spiral tube, and aims to solve the problems of the conventional tube. The use is omitted, and only the latter special-shaped uneven pipe P shown in FIG. 2 is targeted, and the vertical and horizontal flat walls 2a and 2b of the rectangular convex wall 2 of the special-shaped uneven pipe P are removed. Utilizing the advantage that it can be easily and stably arranged in parallel and stacked in parallel in both horizontal and vertical directions by utilizing such pipes, such pipes can be installed in the ground in multiple rows and multiple locations. A multi-stage pipe is used to form a multi-hole pipe.

However, in the case of the specially shaped uneven pipe P, a plurality of rows and a plurality of stacked pipes are formed in the excavation groove, and after the pipe is formed, a small space formed between the adjacent circular wall portions (recesses) 3, 3 is formed. Then, a filler such as sand or earth and sand is pressed and solidified, and then the excavation trench is buried and covered with soil. However, the operation of sufficiently compacting and filling the small space with a filler such as sand or earth and sand requires a great deal of time and labor.

The inventor of the present invention has completely changed the idea from such a gap filling method, and has developed a method of burying a pipe in the ground which enables extremely quick and easy work of burying the pipe in the ground. The purpose is to provide.

[0009]

In order to achieve this object, one of the methods of burying a pipe body underground according to the present invention, which is adopted in the present invention, is that a pipe wall 1 is formed in an axially uneven shape, and a convex part 2 is formed. A pipe P having a rectangular cross section and a concave cross section 3 formed in a circular shape is stacked in a plurality of rows and a plurality of stages in a groove G formed by excavating the ground, and is piped into a block B shape. After the upper surface and both side surfaces are covered with the water-impermeable sheet s, the groove G is backfilled and covered with soil.

Another method is that the tube wall 1 is formed in an uneven shape in the axial direction, the cross section of the convex portion 2 is square, and the concave portion 3 is formed.
Pipes P having a circular cross section are piled up in a plurality of rows and a plurality of stages in a groove G formed by excavating the ground, and piped in a block B shape. The upper surface and both side surfaces of the block B are impermeable sheets s After covering with block B, another tube P
Are stacked in a single-stage form, and then the grooves G are backfilled and covered with soil.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In carrying out these methods, pile members k, k... For preventing the block-shaped pipes P.. An operation step of driving and standing up at an arbitrary interval may be included. The pile members k, k,... Can be driven upright before pipes, after pipes are connected in multiple stages, after the block B is formed, before the water-impermeable sheet s is covered, or after the sheet s is covered. May be erected from outside.

Since the pipe P referred to in the present invention is used by being buried under the ground, its forming material is highly water-resistant such as polyolefin resin such as polyethylene or polypropylene or polyvinyl chloride resin. A tube formed using a synthetic resin material is suitable. In addition, impermeable sheet s
Also, a light and thin film-like sheet which is excellent in water resistance and is easy to handle is preferable. For example, as in a sheet formed by stretching a polyethylene film and cutting it to a required width and arranging it in the vertical direction and the horizontal direction and bonding it to the polyethylene film, the tensile strength in the vertical direction and the horizontal direction is increased. Excellent sheets are preferred.

[0013]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 7 are diagrams for explaining an embodiment of the first means of the present invention. FIG. 1 is a longitudinal sectional view showing a state after the embodiment is carried out, FIG. 2 is a perspective view showing a tube used, and FIG. 3 is a block in which the tubes are stacked in a plurality of rows and a plurality of stages. FIG. 4 to 7 are longitudinal sectional views sequentially showing the embodiment in the order of steps.

As shown in FIG. 2, the pipe P used in this embodiment has a pipe wall 1 having a shape of an annular uneven waveform in the axial direction of the pipe, and a cross section of the convex portion 2 having the uneven waveform. The shape is a substantially square shape with rounded corners, and the cross-sectional shape of the concave portion 3 connecting the convex portion 2 to the convex portion 2 is a perfect circular shape, and the convex portion 2 and the concave portion 3 are alternately formed. It is a tube formed in a continuous shape. In addition, the tube wall 1 of the tube P referred to in the present invention is not limited to such a tube having an annular uneven waveform, and a tube having a spiral uneven waveform can be used.

The means for forming such a pipe P by burying such a pipe P in the ground will now be described. In this embodiment, as shown in FIG. 3, the pipes P are arranged in three rows in a row, and the pipes P are vertically stacked in three stages to obtain a total of nine pipes P.
.. Are arranged in a convergent state with reference to FIG. 4 to FIG.

First, the ground 10 on which a pipe is to be formed is excavated to a required width and a required depth to form a groove G required for piping. If necessary, sand or the like 11 is spread over the bottom surface to make the groove bottom almost flat (FIG. 4). Thereafter, a plurality of rows, a plurality of stages on the flat surface, i.e., in this embodiment, first, three pipe P ... a by piping in parallel state, to form a block B ₁ of the first stage. Subsequently, another three pipes P ... are stacked immediately above the block B ₁ , and another three pipes P ... are further stacked thereon, so that a total of nine pipes P ... Forming a block B assembled into a substantially square shape (see FIG. 5,
6). If necessary, at this point, a fluid sand or the like is scattered on the block B, and the small space formed between the adjacent circular wall portions 3 and 3 between the pipes is temporarily filled with the sand or the like. May be. Next, from above the block B, for example,
As described above, the belt-like body obtained by stretching the polyethylene film and cutting it to a required width is disposed in the longitudinal direction and the lateral direction, and is covered with the water-impermeable sheet s formed by polymerizing and bonding in a sandwich shape with the polyethylene film (FIG. 6) The block B is covered almost entirely with the impermeable sheet s on the upper surface and the left and right side surfaces (FIG. 7).

In FIGS. 7 and 1, both ends of the water-impermeable sheet s are shown to end substantially at the lowermost end of the block B, but both ends of the sheet s cover the entire block B. Further, it may be extended to a state of partially covering the sand surface 11 at the groove bottom.

After covering the block B with the impermeable sheet s in this way, the trench G is backfilled with the excavated soil 12, and the soil on the block B is covered as shown in FIG.

FIG. 8 shows another method, which is the same as that of the previous embodiment.
In this embodiment, three pipes P are stacked on the bottom surface of the excavation groove G in three rows and three columns to form a perforated pipe. In this embodiment, first, six pipes are formed. The blocks P are stacked in three rows and two columns to form a block B. In this state, the impermeable sheet s is put on the block B in the same manner as described above,
The upper surface and both side surfaces are covered with the impermeable sheet s. After this, another three pipes P are stacked and piped on the block B on which the sheet s is placed. At this time, if necessary, as indicated by the chain line,
Further overlies this in another impermeable sheet s _2, if necessary, remain without covering the sheet s _2, similar to the above, backfilled excavation groove G, to soil cover the pipe P ... above.

In FIG. 8, in carrying out this method, the blocks B with the stacked pipes are placed in the sheet s.
From the outside of the tube, on both sides, a block-shaped tube P ...
During or after soil covering, pile members k, k,. After this, it is shown that the above-mentioned earth covering work is performed.
However, the pile-up operation of the pile members k, k,... May be performed before piping, after piping in multiple stages, or after forming the block B and before covering the impermeable sheet s. Needless to say, the standing of the pile members k, k may be carried out also in the case of the first embodiment.

The representative embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the means described in these embodiments, but includes the above-mentioned constituent elements of the present invention. In addition, the present invention achieves the object of the present invention, and can be implemented with appropriate modifications within a range having the following effects.

[0022]

As is apparent from the above description, both the method of claim 1 and the method of claim 2 are applicable to the method of the present invention.
A pipe body in which the pipe wall is formed in an uneven shape in the axial direction, the cross-sectional shape of the convex portion is formed in a square shape, and the cross-sectional shape of the concave portion is formed in a circular shape is set as a target pipe body of the present invention. Since multiple rows and multiple stages are stacked in the excavated trench and piped in a block shape, this stacking and piping work can be performed extremely easily and quickly, and can be stably formed in a block shape with a square cross section. In claim 1, the entirety of the stacked blocks is covered with a water-impermeable sheet s, and in claim 2, another one-stage pipe is stacked on the block covered with the water-impermeable sheet, and thereafter, Since the excavation trench is backfilled and covered with soil, it takes a lot of time to fill sand, earth and sand, etc. in the small space created between the adjacent circular wall portions of this pipe when burying this pipe. Significantly reduces the number of steps for compacting and filling Burying pipes in the ground can be carried out very quickly and easily, and the pipes must be buried underground in such a way that the land subsidence phenomenon hardly occurs after the work. It has a remarkable effect that it can be buried.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a pipe buried state of a first embodiment.

FIG. 2 is a perspective view of a tube.

FIG. 3 is a perspective view of a tube block.

FIG. 4 is a longitudinal sectional view illustrating an initial step.

FIG. 5 is a longitudinal sectional view illustrating a next step.

FIG. 6 is a longitudinal sectional view illustrating a third step.

FIG. 7 is a longitudinal sectional view illustrating a process before soil covering.

FIG. 8 is a longitudinal sectional view of a portion corresponding to FIG. 7 showing the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe wall 2 Convex part 3 Concave part P Pipe body G Drilling groove B Pipe block s Impermeable sheet k Pile member

Claims (3)

[Claims] 1. A tube wall (1) is formed in an uneven shape in an axial direction,
A pipe (P) having a convex section (2) having a rectangular cross section and a concave section (3) having a circular cross section is stacked in a plurality of rows and steps in a groove (G) excavated from the ground. A method of burying a pipe body in which a pipe is laid in the shape of a block (B), the upper surface and both side surfaces of the block (B) are covered with an impermeable sheet (s), and the groove (G) is backfilled to cover the soil. 2. The pipe wall (1) is formed in an uneven shape in the axial direction,
A pipe (P) having a convex section (2) having a rectangular cross section and a concave section (3) having a circular cross section is stacked in a plurality of rows and steps in a groove (G) excavated from the ground. After piping in the form of a block (B) and covering the upper surface and both side surfaces of the block (B) with the water-impermeable sheet (s), a pipe (P) is further stacked on the block (B) in a single-stage shape. A method of burying a pipe body to fill the trench (G) and backfill the soil afterwards. 3. The method according to claim 1, further comprising the step of driving the pile members (k) for preventing misalignment of the pipe at both sides of the stacked pipes (B) at arbitrary intervals.
The method of burying a pipe body underground according to the above.