RU2253789C2 - Method and device for replacing underground pipelines - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method comprises breaking down the exhaust steel underground pipeline, separating it in longitudinal direction, and laying the new pipeline. The device comprises impact mechanism, expander connected with the wrench through a rope, and disturber made of hollow bushing with cuts and mounted in the face of the exhaust pipeline that enters the receiving well.

EFFECT: reduced power consumptions fro repairing.

4 cl, 2 dwg

Description

The present invention relates to the field of construction equipment and can be used for trenchless replacement of steel pipelines.

A known method of trenchless replacement of underground utilities, (RF patent No. 2163321), according to which a well is formed with a new pipeline drawn into it by longitudinal dismemberment of the old pipeline with its subsequent disclosure, wherein the old pipeline is dismembered along its lower part.

The disadvantage of this method is the low reliability, because when replacing steel pipelines, the cut may not be straight, but in a spiral and not even, but ragged. This can lead to disruption of the surface of the new pipeline, which is extremely undesirable, because water pipelines are under pressure.

There is a method of trenchless replacement of pipelines according to European patent No. 0379707 B1, according to which the destruction of the old pipeline is carried out in the soil, it is cut lengthwise, then it is pressed into the array by means of an expander and a new pipe is tightened.

The disadvantage of this method is the high energy intensity, because all technological operations are carried out simultaneously, low reliability, because parts of the destroyed old pipeline during shrinkage of the soil can damage the pipe being drawn in, which will lead to a rupture of the pipeline when pressure is applied to it. In addition, salt deposits on the inner surface of the old pipeline being destroyed and pressed into the massif pollute the underground space of built-up urban areas.

The technical problem solved by the invention is to increase reliability, reduce energy consumption of the method of replacing steel water pipelines while increasing its environmental friendliness.

A device for trenchless replacement of underground utilities is known from the RF patent No. 2163321. The device is a shock unit and a destroyer, made in the form of pointed and supporting ribs mounted opposite each other. The old pipeline is cut in the lower part, and then revealed under the action of the shock assembly, to which the new pipeline is attached.

The disadvantage of this device is the high requirements for the power of the shock assembly, which is spent not only on cutting the old pipe, but also on opening it, as well as the possibility of the environment getting harmful deposits accumulated in it as a result of operation.

The device, known from European patent No. 0379707 B1, consists of a percussion mechanism on which the expander is mounted, a destroyer with two cutting elements is mounted in front of it with a swivel, and it is connected by a cable to the winch.

Compared with the analogue, this device can be used with a less powerful shock assembly, however, its use is limited, because the possibility of environmental pollution is not ruled out, because it presses the cut old pipeline into the surrounding soil. In addition, it is very likely that the pipe being drawn will be damaged by the sharp edges of the old pipe.

The technical problem solved by the invention is to expand the field of use and reduce the energy intensity of the device for replacing steel water pipelines.

This problem is solved by the fact that when trenchless replacement of a steel pipeline, including the destruction of the old pipeline by dividing it in the longitudinal direction and laying a new pipeline, the old pipeline is knocked out by impact loading into the receiving well, while the longitudinal separation of the pipeline is carried out simultaneously with its knocking into the receiving well in which carry out its separation in the longitudinal and transverse directions. This allows you to reduce energy consumption, because the destruction, expansion and ramming of the old pipeline into the soil mass is excluded. In addition, the removal of the old pipeline from the soil mass improves the ecology of the underground space.

It is advisable to knock out the old pipeline by applying dynamic and static loads. This will improve the reliability of the method.

It is advisable to simultaneously carry out the expansion of the soil well while knocking out, this will make it possible to tighten the new pipe in more comfortable conditions, thereby increasing the reliability of the method.

To solve this problem, in a device that includes a percussion mechanism connected by a cable to a winch, an expander and a destroyer made in the form of a hollow sleeve with knives, the destroyer is installed at the end of the old pipeline that goes into the receiving well. This allows you to expand the scope of use of the device, providing the ability to eliminate contact of deposits with the surrounding soil and reduce energy consumption, because the dismemberment of the pipeline does not occur in the soil mass, but in the receiving well.

The method and device is illustrated by drawings.

Figure 1 presents the method of replacement and placement of equipment during the implementation of the method;

Figure 2 is a top section along aa.

The inventive method is as follows.

In the inlet well (not shown in Fig.), An impact assembly 1 is installed, at the rear end of which a drawn pipe 2 is fixed, the expander 3 is usually put on the impact assembly 1. From the impact assembly 1, a cable 4 is drawn from the winch to the surface through the old pipe 5 (on Fig. not shown). The expander 3 shoulder abuts against the end of the old pipeline 5. The destroyer 6 through the cable 4, passed through it and through the block 7, is installed in the end of the old pipeline 3 from the side of the receiving well 8 and is attracted to the bottom. To begin work, compressed air is supplied to the shock assembly 1 through the air duct 9. A winch (not shown) is also included in the work, the cable 4 is pulled, pressing the destroyer 6 to the end of the old pipeline 5. The shock assembly 1 transfers the shock load to the steel pipe through the expander 3, and the tensioned cable 4 compensates for the impact of the impact unit 1 and the elastic reaction of the soil mass and ensures tight contact of the expander 3 with the end of the steel pipe 5 at the time of transmission of the shock pulse. Under the influence of impacts of the impact unit 1, the old steel pipe 5 begins to exit into the receiving well 8, in which the blades 10 of the destroyer 6 cut it in the longitudinal direction into two parts 11 (Fig. 2). Upon reaching the sides of the receiving well 8 with the cut parts 11, the device is stopped and the parts 11 cut in the longitudinal direction are cut in the transverse direction. Next, the cycle repeats. Knocking out the pipeline 5 from the soil mass, the impact unit 1 and the expander 3 move together with the pipeline 5, the expander 3, compacting the soil, expands the soil well, draws a new pipeline into it.

Using this method allows you to change steel pipelines with harmful deposits without harming the environment. Placing a new pipeline in a well free of residues of the old pipeline guarantees surface integrity and safety in the event of a special external coating. Diversity of application of loads along the route (loads for knocking out and loads for destruction) allows the use of less powerful shock nodes for replacement.

Claims (4)

1. The method of trenchless replacement of a steel underground pipeline, including the destruction of the old pipeline, its separation in the longitudinal direction and the laying of a new pipeline, characterized in that the old pipeline is knocked out by shock load in the receiving well, while the longitudinal separation of the pipeline is carried out simultaneously with its knocking in the receiving a well in which it is divided in the longitudinal and transverse directions. 2. The method according to claim 1, characterized in that the knocking out of the old pipeline is carried out by applying dynamic and static loads. 3. The method according to claim 1 or 2, characterized in that simultaneously with the knocking out of the old pipeline, the expansion of the soil well is carried out. 4. A device for implementing a method of trenchless replacement of a steel pipeline, including a percussion mechanism connected by a cable to a winch, an expander and a destroyer made in the form of a hollow sleeve with knives, characterized in that the destroyer is installed in the end of the old pipeline emerging into the receiving well and is made in in the form of a hollow sleeve with knives.

Images