RU2594497C1 - Method of laying pipes and a pipe for its implementation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction, particularly, to horizontal drilling technologies and equipment for trenchless laying of pipelines. Method of laying pipes is based on the technology of horizontal directional drilling with or without the use of destruction method. Prior to pulling a pipe into the trench its outer diameter is increased to match the diameter of its bell with application of a low friction coefficient and/or smaller soil sticking coefficient coating on the aligned surface.

EFFECT: technical result is broader functional capabilities and higher reliability of pipelines laying.

1 cl, 1 dwg

Description

The technical solution relates to the field of construction, in particular to technologies and equipment for horizontal drilling for trenchless laying of pipelines.

One of the problems facing the developers of this type of technology is to increase the operational characteristics, efficiency and expand the functionality of both the technology itself and the devices used to implement it.

Known methods for trenchless pipe laying in the ground. The methods include immersing the pipe into the soil with its open end, forming a soil core in it and removing it from the pipe with the supplied fluid by tearing and extruding in parts (see RF patents No. 2501913, No. 2516630, IPC E02F 5/18).

Common disadvantages of the known technical solutions are insufficiently wide functionality and insufficient reliability of the applied methods of laying pipelines.

There is also a known method and device for trenchless pipe laying (see RF patent No. 2392389, IPC E02F 5/18 - prototype), based on horizontal directional drilling technology, the disadvantages of which are not wide enough functionality, and insufficient reliability of piping. This is especially true for laying cast iron pipes of the VChShG type, since the presence of a connecting bell in diameter larger than the main pipe leads to a number of negative points, namely:

- sediment after laying the pipeline, because a void forms above the main pipe;

- when the pipe is pulled, the “bulldozer” effect occurs, i.e. a soil shaft is formed that impedes the pulling of the pipe and requires great efforts for this;

- soil sticks to the main pipe, which also complicates the drawing process.

The aim of the invention is to remedy these disadvantages, namely the expansion of functionality and increase the reliability of laying pipelines.

This goal is achieved by the fact that in the known method of pipe laying, based on horizontal directional drilling technology using the fracture method or without it, according to the invention, before pulling the pipe into the trench, its outer diameter is increased and aligned to the diameter of its socket with drawing on a leveled surface coatings with a low coefficient of friction and / or with a lower coefficient of adhesion of the soil, and the increase in the diameter of the pipe is carried out by pulling and fixing polyethylene on it oic pipe with an outer diameter commensurate with the diameter of the bell pipe stretches.

To implement this method, a pipe is proposed that includes a cylindrical part with a socket at one of its ends, according to the invention, on the cylindrical part of which an external pipe is installed with an outer diameter equal to the diameter of the socket and with a low coefficient of friction and / or with a lower coefficient of adhesion of the soil.

In addition, the outer pipe is made of low pressure polyethylene (HDPE), and supports are installed between the drawn pipe and the outer pipe.

In addition, the cavity between the drawn pipe and the outer pipe is filled, for example, with a foamy substance such as polyurethane foam.

The proposed technical solution is illustrated in the drawing, where in FIG. one:

1. The drawn pipe

2. The cylindrical part

3. Bell

4. Outer pipe

5. Supports

6. Polyurethane foam.

The drawn pipe 1 for implementing the method includes a cylindrical part 2 with a socket 3 at one of its ends, and an outer pipe 4 with an outer diameter equal to the diameter of the socket 3, with a low coefficient of friction and with a lower adhesion coefficient is installed on the cylindrical part 2 of the pipe 1.

The inserted outer pipe 4 is made of HDPE, with supports 5 installed between the drawn pipe 1 and the external pipe 4, and the cavity between the drawn pipe 1 and the external pipe 4 is filled with polyurethane foam.

In the implementation of the proposed method uses a conventional installation for horizontal directional drilling, such as "Grundoburst" or "Navigator".

Its work is practically no different from normal, except that the efforts for pulling the pipe 1 together with the external pipe 4 require significantly less, because there is no protruding bell, and the coefficient of sliding friction and the coefficient of adhesion of the soil is lower. This makes it possible to stretch it to a greater distance with the same developed efforts. In addition, the presence of the outer pipe 4 contributes to the preservation of the protective coating (galvanization) of the pipe 1, which increases its service life. The presence of supports 5 does not allow the pipes 1 and 4 to move relative to each other, which is facilitated by the polyurethane foam layer 6, which also serves as thermal insulation, which also increases efficiency. The absence of a significant cavity (void) between the extended pipes and the soil significantly reduces the likelihood of subsidence.

Thus, the use of the proposed technical solution will expand the functionality of the technology and increase the reliability of pipelines.

Claims (2)

1. A method of laying pipes based on horizontal directional drilling technology using the fracture method or without it, characterized in that before pulling the pipe into the trench, its outer diameter is increased and aligned to the diameter of its socket with a low friction coefficient applied to the leveled surface and / or with a lower coefficient of adhesion of the soil. 2. The method of laying pipes according to claim 1, characterized in that the increase in the diameter of the pipe is carried out by pulling and securing a polyethylene pipe with an external diameter commensurate with the diameter of the socket of the pipe being drawn.

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