JP2001132875A - Synthetic resin pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe body provided with an advantage of easily forming a stacked perforated pipeline in the ground by stably and easily stacking the required number of pipe bodies in plural rows and plural stages, allowing a multiple pipe to be easily and rapidly piped and buried in the ground without needing vibrator work and water-binding work in earth covering, and free from the occurrence of a ground subsidence phenomenon after piping. SOLUTION: This synthetic resin pipe body is provided with an inner pipe 1 with its pipe wall formed in rugged shape along the direction of a pipe axis by alternately arranging projecting parts 2 of square cross-sectional shape with large cross-sectional area and recessed parts 3 of circular cross-sectional shape with small cross-sectional area; and an outer pipe 4 of square cross-sectional shape covering the inner pipe 1 at the outer peripheries of the projecting parts 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe used for protecting underground cables, such as optical fiber cables and power lines and telephone lines, and for water supply, mainly in the ground. The required number, for example, 6 or 9 or 12 is stacked in multiple rows and multiple stages in a trench excavated from the ground, piped in a block shape, and buried in the ground to be used as a porous pipeline The present invention relates to a synthetic resin tube body suitable for performing the above.

[0002]

2. Description of the Related Art Conventionally, a general synthetic resin uneven tube 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 to provide an electric wire protection tube or the like. It is widely known that the pipes are used as water pipes.However, in order to pipe such circular uneven pipes in multiple rows and multiple stages, these pipes do not collapse and the stacked state is stably maintained. In order to do this, it was necessary to perform pile driving work on both sides of the piping location and bundling work of the entire pipe at appropriate intervals.

The applicant of the present application has proposed a pipe wall structure that can be stably stacked without requiring such a pile driving operation or a bundling operation, as shown in FIG. A tube Pa having an irregular shape in which convex portions 2 having a rectangular and large cross-sectional area in the tube axis direction and concave portions 3 having a circular cross-sectional shape and a small cross-sectional area are formed alternately and continuously. Has been developed and has already been proposed. This tube Pa
Can be stacked in a plurality of rows and a plurality of stages (in the figure, three rows and three stages of pipes) to form a stacked collecting pipe Ps as shown in the sectional view of FIG. After being laid in the groove G, the earth and sand 6 excavated in the groove G is buried back.

[0004]

As described above, when the pipes Pa having the above structure are stacked in a required number and buried in the ground as a collecting pipe Ps to cover the soil, as shown in the left half of FIG. In addition, the backfilled earth and sand 6 penetrates around the recess 3 between the upper surface and the outer surface of the collecting pipe Ps, but the adjacent pipe P
It is difficult to reliably penetrate into the space S surrounded by a, Pa..., and it is only a degree that the space remains as it is or enters slightly in a rough state.

[0005] When the space S is in the unfilled state or close to it as described above, every time rain or vibration is applied to the covered road surface of the groove G, the covered soil on the collecting pipe Ps is generated. 6 gradually falls into the space S, and the road surface gradually causes the land subsidence phenomenon D as illustrated in the right half of the figure. It is necessary to perform a vibrator operation and a water-tightening operation, and there is a problem that a great deal of time and labor is required.

Accordingly, an object of the present invention is to fundamentally solve the problems of such a prior art pipe Pa, and the required number of tubes of the prior art pipe Pa is required. Can be easily and stably stacked in multiple rows and multiple layers,
Despite having the advantage of being able to easily form a laminated porous conduit in the ground, there is no need to perform vibration vibrator work or water-tightening work when covering the soil, making it easy to bury the collecting pipe Ps in the ground. It is an object of the present invention to provide a pipe which can be made quickly and has a structure in which even if rainfall or vibration occurs on a covered road surface after piping, there is no possibility that a land subsidence phenomenon will occur.

[0007]

In order to achieve the above object, the construction of the synthetic resin pipe body according to the present invention is characterized in that the pipe wall has a rectangular cross section with a large cross section along the pipe axis direction. Part two,
An inner tube 1 formed in an uneven shape by alternately arranging concave portions 3 having a small cross-sectional area and a circular cross section, and an outer tube 4 having a rectangular cross section that covers the inner tube 1 on the outer periphery of the convex portion 2 Are provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In implementing a synthetic resin tube having the above configuration, the outer tube 4 and the inner tube 1 may be formed in a non-adhered state, or the outer tube 4 and the inner tube may be connected to each other. 1 can be embodied as a tube structure in which a portion or the entire circumference of the convex portion 2 is bonded. Needless to say, the term “adhesion” used herein includes not only adhesion using an adhesive but also fusion means.

In the case where the inner tube 1 and the outer tube 4 are partially bonded to each other, a structure in which the inner tube 1 is partially or substantially entirely bonded to one side of the protrusion 2 of the inner tube 1 is used. The present invention can be embodied with a structure in which the two sides facing each other are partially or almost entirely bonded, or a structure in which each of the four sides is partially bonded.

The inner tube 1 and the outer tube 4 having the above-described structure are used.
As a forming material, a non-chlorine resin material such as a polyolefin resin such as polyethylene (PE) and polypropylene (PP) is preferable.
VC), and a synthetic resin material having excellent compression resistance and water resistance and little deterioration over time is preferable. In manufacturing the pipe body P, the inner pipe 1 is formed using continuous blow molding means, and the outer pipe 4 is extruded into a tubular shape on the outer periphery to cover the outer pipe 4 easily and efficiently. it can.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. 1 to 5 are views for explaining a first embodiment of the present invention. FIGS. 1 and 2 are perspective views showing the external shape of the tubular body of the embodiment cut by a concave portion and a convex portion, respectively.
And FIG. 4 is a diagram showing a cross-sectional shape of these concave portions and convex portions,
FIG. 5 is a sectional view taken along the line AA in FIG.

The basic form of the inner tube 1 shown in this embodiment is, as shown in FIGS. 1 to 5, such that the shape of the tube wall is an annular uneven waveform in the axial direction of the tube. The cross-sectional shape of the convex portion 2 is a substantially square shape with rounded corners, and the cross-sectional shape of the concave portion 3 connecting the convex portion 2 and the convex portion 2 is a perfect circular shape. The recesses 2 and the recesses 3 are formed in a continuous shape.

The inner tube 1 shown in the first embodiment is
A PE resin tube is extruded and blow-molded using a generally known caterpillar type endless continuous blow molding machine. After cooling, the PE resin tube is passed through a hollow die of another extrusion molding machine, and the inner tube 1 is formed. The outer tube 4 is formed by extruding a PE resin tube on the outer periphery to cover the inner tube 1.

In this case, since the material of the inner tube 1 and the material of the outer tube 4 are both PE resins, the outer tube 4 is horizontally aligned with the vertical walls 2a, 2a forming the square convex portion 2 of the inner tube 1. Wall 2
b and 2b are in contact with and fused to the entire surface. However, if the materials of the inner tube 1 and the outer tube 4 are changed, for example, the outer tube 4
If the material is made of PVC resin, a pipe body P in which the inner pipe 1 and the outer pipe 4 are in contact with each other on the entire surface of the convex portion 2 of the inner pipe 1 but are not bonded is obtained.

In order to bury the pipes P in the ground, as shown in FIG. 8, three rows are arranged side by side, and three rows are stacked vertically to collect a total of nine pipes P. Drilling trench G as Ps
And buried by excavating earth 6 from both sides and from above. The covered earth and sand 6 presses the collecting pipe Ps from the surroundings, and functions to maintain the collecting state.
In this state of being buried in the soil, the pipe P has a rectangular cross-section and is formed over the entire length in the pipe axis direction, so that the earth and sand 6 covered on the collecting pipe Ps is stabilized without flowing down. Prevents subsidence.

FIGS. 6 and 7 show another embodiment. In the structure of the embodiment shown in FIG. 6, the inner tube 1 and the outer tube 4
The inner pipe 1 and the outer pipe 4 are non-adhered and can move freely relative to each other in the middle of the left and right vertical walls 2a, 2a. is there.

In the third embodiment shown in FIG. 7, the inner tube 1 and the outer tube 4 formed on the outer periphery thereof are bonded to almost all of the upper and lower horizontal walls 2b, 2b of the convex portion 2 of the inner tube 1 with an adhesive. 5,5
The inner tube 1 and the outer tube 4 are non-adhered and can move relatively freely over the entire area of the left and right vertical walls 2a, 2a.

In the case of the pipe P described in the first embodiment, the inner pipe 1 and the outer pipe 4 are bonded to each other on the entire peripheral surface of the convex portion 2. Is mainly borne by the concave portion 3 of the inner tube 1 and the portion of the outer tube 4 located on the outer periphery thereof, which is preferable as a pipe which does not require bending with a small radius of curvature. In the case of a tube that is in a non-adhered state on the peripheral surface, the flexibility of the tube body P is good, and the inner tube 1 and the outer tube 4 are relatively deformed as necessary, so that a bend having a small radius of curvature can be formed. Suitable for required piping.

As shown in FIG. 6, in the case of a pipe in which the inner pipe 1 and the outer pipe 4 are adhesively connected only at a part of the opposing side wall as in the pipe P shown in the second embodiment. In this case, the meandering in the horizontal direction is restricted, and the meandering in the vertical direction can be conveniently used as a tube. In addition, as in the pipe body P shown in the third embodiment, almost the entire opposite side wall is provided. In the pipe in which the inner pipe 1 and the outer pipe 4 are adhesively connected,
Not only is the vertical meandering in FIG. 7 restricted,
Horizontal meandering can also be conveniently used as a slightly restricted tube. In addition, in the case of these pipes P, it goes without saying that it is only necessary to change the pipe angle in the vertical direction or the horizontal direction on the side to which the pipes are bonded, and to appropriately pipe them.

Although the representative embodiments of the present invention have been described above, the present invention is not necessarily limited to only 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.

[0021]

As is clear from the above description, the pipe body of the present invention has a tube wall of an inner pipe formed in an uneven shape in the axial direction, a cross-sectional shape of a convex portion and a cross-sectional shape of a concave portion. Is a pipe formed in a circular shape, and is a special form of pipe in which an outer pipe having a rectangular cross section is formed on the outer peripheral surface thereof, so that the pipe has a good seating at the time of piping, and an arbitrary number of pipes Has the advantage that it can be easily and stably stacked in multiple rows and multiple stages, and has the advantage that a multi-layered porous pipeline can be easily formed in the ground. And you do n’t have to do
The present invention has a remarkable effect that the work of burying the collecting pipe in the ground can be easily and promptly performed in a state where the land subsidence phenomenon does not occur even if rainfall or vibration occurs on the road surface after piping.

[Brief description of the drawings]

FIG. 1 is a perspective view of an outer shape of a tubular body according to a first embodiment, which is cut by a recess.

FIG. 2 is a perspective view cut by a convex portion showing an external shape of the tubular body.

FIG. 3 is a longitudinal sectional view of a concave portion of the tubular body.

FIG. 4 is a longitudinal sectional view of a convex portion of the tubular body.

FIG. 5 is a sectional view of the pipe taken along line AA in FIG. 3;

FIG. 6 is a longitudinal sectional view of a convex portion of a tube according to a second embodiment.

FIG. 7 is a longitudinal sectional view of a tube of a third embodiment at a convex portion.

FIG. 8 is a cross-sectional view illustrating a state of use of the tube of the first embodiment.

FIG. 9 is a perspective view showing the appearance of a conventional tubular body.

FIG. 10 is a cross-sectional view illustrating a use state of a conventional tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner pipe 2 Convex part 2a Vertical wall of convex part 2b Horizontal wall of convex part 3 Concave part 4 Outer pipe 5 Adhesive P Pipe Ps Collecting pipe

Claims (3)

[Claims] 1. A convex portion (2) having a rectangular cross section with a large cross section and a concave portion (3) having a circular cross section with a small cross section are alternately arranged along the pipe axis direction. Synthetic resin tube body comprising: an inner tube (1) formed in an uneven shape by means of a tube; and an outer tube (4) having a rectangular cross section that covers the inner tube (1) at the outer periphery of the projection (2). . 2. The synthetic resin tube according to claim 1, wherein the outer tube (4) and the inner tube (1) are formed in a non-adhered state. 3. The synthetic resin tube according to claim 1, wherein the outer tube (4) and the inner tube (1) are bonded at a part or the entire circumference of the projection (2).