JPH05118477A - Underground composite resin tube - Google Patents

Abstract

PURPOSE:To provide an underground composite resin tube having light weight, flexibility, high strength against pressure, and freedom from a partial fracture. CONSTITUTION:The first reinforcement strip 2 having the same sectional area of corrugation as a wall tube corrugation is embedded in a tube wall 1 comprising a spirally corrugated synthetic resin with a posture open downward over the range of the crest section 1a of the tube wall 1 and both side wall sections 1b and 1b continuous thereto. At the same time, the second reinforcement strip 2' is embedded with a posture open upward over the range of each trough section 1c of the tube wall 1 and both side wall sections 1b and 1b continuous thereto. Furthermore, both side plate sections 2b and 2b of the first reinforcement strip 2 are jointed to both side plate sections 2b' and 2b' of the second reinforcement strip 2' via polymerization at both side wall sections 1b and 1b of the tube wall 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a drainage pipe, an electric wire protection pipe,
It is used by laying in the ground such as a telephone line protection tube. Specifically, underground where a reinforcing strip made of a thin metal plate is embedded in the wall thickness of a synthetic resin tube wall formed in a spiral wave shape. The present invention relates to a composite resin pipe for laying.

[0002]

2. Description of the Related Art Conventionally known composite resin tubes of this type are disclosed in, for example, Japanese Utility Model Laid-Open No. 61-141889. While various tube wall cross-sectional shapes are shown in the publication, the cross-sectional shape as a common divisor has a cross-sectional structure as shown in FIG.

In FIG. 11, 01 is a synthetic resin tube wall formed in a spiral wave shape, 02 is a thin metal plate such as a stainless steel plate having a U-shaped cross section and projecting edges 02a and 02a at its open both ends. A reinforcement strip, which is embedded in the pipe top 01 in the state where the strip strip 02 is opened downward and the side wall portions 01b and 01b continuous to the top portion 01a of the pipe wall 01. Thus, a reinforcing cutout portion A where no reinforcing strip exists is formed in a part of each valley portion 01c of the pipe wall 01 in which the projecting edges 02a, 02a of the adjacent reinforcing strips 02, 02 are buried.

[0004]

The conventional composite resin pipe for underground laying constructed as described above is lighter in weight than the concrete fume pipe or cast iron pipe which is often used as this type of underground laying pipe. In addition, it has excellent flexibility, is easy to transport and lay, and has the advantage that it can be configured to have a pressure resistance comparable to that of a fume tube, but it has reinforcement cuts in the troughs of the tube wall. Since part A exists,
When laid in a curved line in the ground, the reinforcement break A
In addition, stress is concentrated on static loads and dynamic loads, and cracks and cracks are likely to occur.

Further, when excavating a road or excavating a buried pipe, a pickaxe or a tip blade of an excavator unexpectedly collides,
There was a risk of breaking through the cut portion A. The present invention has been made in order to solve the above-mentioned problems, and it is lightweight, has flexibility, and locally suppresses damage as much as possible, and exhibits a high pressure resistance effect. An object is to provide a composite resin pipe for inlaying.

[0006]

In the composite resin pipe for underground installation according to the present invention, a reinforcing strip plate made of a thin metal plate embedded in a synthetic resin pipe wall formed in a spiral wave shape is A first reinforcing strip having a substantially U-shaped cross section or a substantially U-shaped cross section extending over each mountain peak portion or each valley portion and both side wall portions continuous with them, and the first reinforcing strip adjacent to each other in the pipe axis direction. It is characterized in that it is composed of a second reinforcing strip plate having a cross-sectional shape that overlaps with the end portion of the plate.

[0007]

According to the composite resin pipe for underground installation according to the present invention,
Since the entire pipe wall has a spiral wave shape, even if a reinforcing strip made of a thin metal plate is embedded, it is light enough to be installed while still being flexible enough to allow curved piping. It can be done easily. And, in the laid condition in the ground, the reinforcing strips counter the earth pressure and exert a great pressure resistance so as not to cause deformation, and the reinforcing strips embedded in the synthetic resin pipe wall Since there are no cuts, there is no risk of breaking through when digging underground pipes.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, in which 1 is a synthetic resin tube wall formed in a spiral wave shape with a trapezoidal cross section, and 2 is a trapezoidal cross section, and a stainless steel plate. Is a first reinforcing strip made of a thin metal plate such as.

Reference numeral 2'denotes a trapezoidal cross section in which the upper side dimension and the open portion width dimension are slightly smaller than those of the first reinforcing strip plate 2,
Similarly to the above, it is a second reinforcing strip made of a thin metal plate such as a stainless steel plate, wherein the first reinforcing strip 2 is the pipe wall 1
Is embedded in the wall thickness of the pipe wall 1 in a downwardly open posture over each mountain top portion 1a and both side wall portions 1b, 1b connected to the mountain top portion 1a, and the second reinforcing strip 2'is formed on the pipe wall. Each trough of 1
1c and both side wall portions 1b, 1b connected to it are embedded in the wall thickness of the pipe wall 1 in an upward open posture, so that both side plate portions 2b, 2b of the first reinforcement strip 2 and the second reinforcement strip Both side plate portions 2b ′, 2b ′ of the plate 2 ′ are double-polymerized on both side wall portions 1b, 1b of the tube wall 1, respectively.

The first and second reinforcing strips 2, 2 '
3 is a punching metal in which a large number of small holes 3 ... Are formed, as shown in FIG. 3, but it may be a flat plate having no small holes. Next, another embodiment of the present invention will be listed.

[0011]. In the embodiment shown in FIG. 4, the synthetic resin pipe wall 1 is formed in a spiral wave shape having an arc-shaped cross section, and the first reinforcing strip plate 2 and the second reinforcing strip plate 2'are also formed of the pipe wall 1. It has an arcuate cross section in accordance with the cross sectional shape.

[0012]. In the embodiment shown in FIG. 5, the cross-sectional shape of the tube wall 1 is a spiral wave shape having a trapezoidal cross-section like the embodiments shown in FIGS. 1 and 2, and both side plate portions 2b of the second reinforcing strip 2 '. ',
Inside the 2b ', the first reinforcing strips 2 located on both sides thereof,
The two side plate portions 2b, 2b of each of the two are arranged so as to overlap with each other.

.. In the embodiment shown in FIG. 6, the cross-sectional shape of the pipe wall 1 is formed in a spiral shape having an arc-shaped cross-section as in the embodiment shown in FIG. 4, and the first shape is formed in an arc-shaped cross-section according to the cross-sectional shape. The reinforcing strip plate 2 and the second reinforcing strip plate 2'are interlocked and arranged as in the embodiment shown in FIG.

.. In the embodiment shown in FIGS. 7 to 10, the first reinforcing strip 2 and the second reinforcing strip 2 ′ are different in cross-sectional shape from each other, and end portions of both are superposed on each other. Since the structure of embedding in the pipe wall 1 is the same as that of the above-mentioned respective embodiments, only the first and second reinforcing strips 2 and 2'are shown.

In each of the above embodiments, the resin is interposed in the overlapping portion between the first reinforcing strip 2 and the second reinforcing strip 2 ', but the reinforcing strips 2 and 2'are different from each other. You may make it what is called a metal touch shape which makes direct contact.

Although the reinforcing strips 2 and 2'are embedded in the center of the wall thickness of the pipe wall 1 in the described embodiment, the reinforcing strips 2 and 2'may be biased toward the inside of the pipe wall 1. Particularly, when the reinforcing strips 2 and 2 ′ are formed by using a material obtained by laminating a synthetic resin on a metal plate, there is a synthetic resin laminated on the metal plate inside the reinforcing strips 2 and 2 ′. Therefore, it is not necessary to form the synthetic resin layer for forming the tube wall 1.

[0017]

As described above, according to the composite resin pipe for underground laying of the present invention, the first and second reinforcing strips made of a thin metal plate are embedded in the wall thickness of the spiral wave pipe wall. Since the pipes are continuous without breaks, when the pipe is bent and laid in the ground, stress does not concentrate on a part of it, and the pickaxe and excavator are not Even if the tip blade collides, it can be reliably prevented from breaking through and punching a hole, and the durability as a whole can be remarkably improved as compared with the conventional product at the beginning.

In particular, the pressure-resistant strength can be further increased and the wall thickness of the crest and the trough can be correspondingly reduced by doubling the reinforcing strips on both side walls of the crest and the trough of the pipe wall. Therefore, it is possible to provide a tube having excellent flexibility.

[Brief description of drawings]

1 is a partially cutaway side view,

FIG. 2 is an enlarged vertical side view of a main part,

FIG. 3 is a perspective view showing an example of a reinforcing strip plate,

FIG. 4 is an enlarged vertical sectional side view of a main part showing another embodiment,

FIG. 5 is an enlarged vertical cross-sectional side view of essential parts showing another embodiment,

FIG. 6 is an enlarged vertical sectional side view of a main part showing another embodiment.

FIG. 7 is an enlarged vertical cross-sectional side view of a main part showing another embodiment,

FIG. 8 is an enlarged vertical cross-sectional side view of essential parts showing another embodiment,

FIG. 9 is an enlarged vertical cross-sectional side view of a main part showing another embodiment,

FIG. 10 is an enlarged vertical cross-sectional side view of a main part showing another embodiment,

FIG. 11 is an enlarged vertical sectional side view of a main part of a conventional example.

[Explanation of symbols]

 1 Pipe Wall 1a Peak 1b Side Wall 1c Valley 2 First Reinforcement Strip 2'Second Reinforcement Strip

Claims (1)

[Claims] 1. An underground laying composite resin pipe in which a reinforcing strip made of a thin metal plate is embedded within the wall thickness of a synthetic resin pipe wall formed in a spiral wave shape, wherein the reinforcing strip is , A first reinforcing strip having a substantially U-shaped or U-shaped cross-section extending over each crest or each trough of the pipe wall and both side walls connected to the crest, and the above-mentioned first adjacent strips in the pipe axial direction. 1. A composite resin pipe for underground installation, characterized in that it is composed of a second reinforcing strip having a cross-sectional shape such that each of the end portions of the first reinforcing strip is superposed.