JPH0521584Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sewerage pipeline constructed of double pipes made of plastic as a conduit.

(Prior technology) In general, sewerage pipes are constructed using fume pipes, hard vinyl chloride pipes, reinforced plastic composite pipes, cast iron pipes, etc., which are buried underground and connected at intervals of approximately 0.6 to 4 m to form conduits. They were constructed by installing manholes and other incidental equipment at various locations.

These configurations are generally the same regardless of whether the system is a downstream system or a pressure-feed system.

(Problem that the invention aims to solve) However, in recent years, especially as various structures have become larger, there have been many opportunities for large vibrations to occur due to underground burying work and ground displacement due to such burying work.
These amplify vibrations and displacements, particularly in long sections, and may damage the connections between the conduits or the connections between the conduits and incidental equipment such as manholes, leading to water leakage. Such water leakage may cause serious problems such as environmental pollution due to sewage leaking underground from the pipes and an increase in the amount of sewage treatment due to rainwater, groundwater, etc. flowing into the pipes.

(Means for Solving the Problems) The inventors completed this invention after intensive study to solve the problems.

That is, the present invention has an outer tube made of a corrugated plastic tube, an inner tube made of plastic with a smooth inner surface inserted into the outer tube with a certain gap maintained, and
This is a sewerage pipeline characterized by being constructed of a conduit consisting of.

(Function) With the above structure of the sewer pipe of the present invention, the outer pipe made of a corrugated pipe increases flexibility and absorbs distortion caused by vibration etc., so damage to the above connection parts etc. is avoided.
Furthermore, the inner tube is protected by the outer tube.
Even if a leak occurs in the inner pipe, sewage will not immediately seep into the ground, and conversely, underground water will not directly intrude.

(Example) An embodiment of this invention will be explained with reference to FIG.

1 is made of low-density polyethylene with an inner diameter of 78 mm and an outer diameter.
The inner tube is 89 mm, and 2 is a corrugated outer tube made of high-density polyethylene with an inner diameter of 100 mm and an outer diameter of 130 mm.

These inner and outer tubes are assembled as shown in the figure without being fixed to each other, and the mutual gap is 34mm relative to the cross-sectional area of the inner tube.
% was retained.

In this invention, both the inner tube and the outer tube are made of polyethylene, polypropylene, vinyl chloride,
It is made of plastic material such as ABS resin or cross-linked polyethylene, and it is made of plastic material such as ABS resin or cross-linked polyethylene, and in particular, it has metal wires or fiber strips 3 embedded in a spiral shape as shown in Figure 2 for reinforcement of the outer tube, etc., depending on the purpose of use. The material, shape, structure, etc. are appropriately selected from those commonly used.

The inner tube has a smooth inner surface to improve water flow, and the outer tube has a corrugated tube as described above to improve flexibility and pressure resistance.

The diameters of the inner and outer tubes are appropriately determined and combined so as to maintain an appropriate gap between them, but the preferable gap amount for water retention etc. is 10% relative to the cross-sectional area of the inner tube.
% or more.

It is a good idea to install the water leakage detection detector in advance in such a gap so that water leakage in the conduit can be detected early and repair work can be carried out.

The conduit shown in the first diagram above should be installed 1.5 to 1.5 meters below the road surface of a general road.
In the case of a sewer pipe built at a depth of 6 m, it has been confirmed that it can withstand an internal pressure of 10 Kgf/cm ² when used in a forced-feed system, and can withstand the weight of a 20-ton truck.

(Effects of the invention) The sewer pipe of this invention has the following excellent effects.

(i) The highly flexible and strong corrugated outer pipe absorbs the amplification of pipe displacement caused by construction vibrations, etc., and drastically reduces the occurrence of water leaks.

(ii) Even if water leakage occurs inside the pipe, water will be retained in the gap between the inner pipe and the outer pipe, and sewage will not immediately leak out of the pipe.

(iii) It is possible to adopt highly practical means such as installing the water leak detection means in the gap between the inner pipe and the outer pipe, or installing means for discharging the retained sewage, etc.

(iv) The conduit generally has increased flexibility, which can improve workability in constructing a sewerage system and increase convenience in handling as a long roll product.

(v) Since the material combinations of the outer pipe and inner pipe can be diversified, it can quickly respond to many installation purposes.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views of an embodiment of this invention. 1... Inner tube, 2... Outer tube, 3... Reinforcement strip.

Claims (1)

[Scope of Claim for Utility Model Registration] A conduit consisting of an outer tube made of a corrugated plastic tube, and an inner tube made of plastic with a smooth inner surface inserted through the outer tube with a certain gap maintained. A sewer pipeline characterized by: