RU2363876C1 - Method for erection of underground pipeline at crossing of tectonic fractures - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is related to construction and may be used in underground installation of pipelines that cross zones of tectonic fractures. In method for erection of underground pipeline at crossing of tectonic fractures, locating blocks are fixed in pneumatic springs installed on axis of trays symmetry along pipeline length with pitch equal to pitch of pipeline stands installation, with the possibility of compressed air supply to them via air ducts. After pipeline installation, remaining space is filled with easily deformable material. Height of pneumatic springs in filled condition and gaps between pipelines and trays are accepted as higher than value of maximum possible predicted displacement of pipeline.

EFFECT: application of this method for erection of underground pipeline at crossing of tectonic fractures provides for the following advantages: improved efficiency; reduced labour intensiveness of installation; reduced labour intensiveness of maintenance.

3 cl, 1 dwg

Description

The invention relates to construction and can be used for underground pipelines crossing the zone of tectonic faults.

A known method of constructing an underground pipeline at the intersection of tectonic faults (RF patent No. 2256839, F16L 1/028, publ. 20.07.2005, bull. No. 20). At the intersection of tectonic faults, a trench is torn off, a pipe segment of a diameter larger than that of the pipeline with end walls is laid through it, through which sections of the main pipeline, interconnected by compensators, are passed through a tight seal. Through the nozzles, a liquid with a density higher than the density of the product in the pipeline is fed into the pipe segment until the pipeline emerges and then the trench is filled up. The disadvantage of this method is the complexity and low efficiency.

A known method of constructing an underground pipeline at the intersection of tectonic faults (RF patent No. 2262631, F16L 1/028, publ. 20.10.2005, bull. No. 29). A trench is torn off at the tectonic fault sites, trays are installed in it, a pipeline is placed on the suspensions, trays are closed with plates. Preliminarily, supporting elements with lodgements from segments of pipe segments suspended on the cables on the sides of the trays are laid at certain distances, and the pipeline is laid on lodges. The disadvantages of this method are low efficiency and high complexity.

The technical result of the invention is to increase efficiency and reduce the complexity of installation and maintenance.

The technical result is achieved by the fact that in the method of constructing an underground pipeline at the intersection of tectonic faults, including extracting a trench, installing trays in it, installing support elements with lodgements from segments of pipe segments at a certain distance, laying pipelines on lodgements, closing trays with plates, according to the invention of lodgements fixed on pneumatic springs mounted on the axis of symmetry of the trays along the length of the pipeline with a step equal to the step of installing the pipe racks, with the possibility of pumping compressed air through the air ducts, and after installing the pipeline, the remaining space is filled with easily deformable material, and the height of the air springs in the filled state and the gaps between the pipeline and the trays take more than the maximum possible predicted displacement of the pipeline.

The technical result is also achieved by the fact that the air springs are made of rubber cord.

The technical result is also achieved by the fact that claydite is used as an easily deformable material.

The application of the invention in comparison with the prototype can improve efficiency and reduce the complexity of installation and maintenance.

The method of constructing an underground pipeline at the intersection of tectonic faults is illustrated by a diagram (drawing), which shows a cross section of the pipeline, where:

1 - pipeline;

2 - trench;

3 - lodgements made, for example, from segments of pipe segments of larger diameter;

4 - air spring;

5 - clamps of air springs 4;

6 - tray, for example, rectangular reinforced concrete;

7 - plates;

8 - easily deformable material, for example expanded clay;

9 - duct;

D is the outer diameter of the pipeline.

In connection with the possibility of vertical and horizontal displacements of rocks over zones of active tectonic faults, it is necessary to install compensators to prevent pipeline ruptures. This is possible due to the creation of an elastic base and surrounding easily deformable material, which will eliminate the deformation of pipelines. In the proposed method, it is proposed to use pneumatic springs 4 filled with compressed air as compensators. Due to the filling with compressed air, the elastic properties of the material increase, and accordingly, the efficiency of the method increases.

The method of constructing an underground pipeline at the intersection of tectonic faults is as follows. Trench 2 is torn off. Trays 6 are installed in it. Under factory conditions, pneumatic springs 4 are installed on the axis of symmetry of the trays 6 using clamps 5. Pneumatic springs 4 can be made of rubber cord - a wear-resistant and durable material. When installing trays 6, trays with pneumatic springs 4 installed in them are installed with the condition that the step of installing pneumatic springs 4 is equal to the step of installing the pipe racks outside the zones of tectonic faults. The installation step of the racks is determined by known methods. To enable the pumping of compressed air into the pneumatic springs 4 in the trays 6, an air duct 9 is laid, connecting several pneumatic springs 4 in parallel and brought to the surface at one end to control the pressure in the pneumatic springs 4 and the possibility of pumping compressed air into them. In the case of significant remoteness of the air springs 4 from each other, the air ducts 9 do not remove the surface from each of them. The lodgements 3 are fixed on the pneumatic springs 4, after which they are filled with compressed air and laid on the pipe lodgements 3. The height of the pneumatic springs 4 in the filled state and the gaps between the pipe 1 and the inner surface of the trays 6 take more than the maximum possible predicted displacement of the pipeline to prevent deformation pipeline 1 with its possible movements in the zone of tectonic fault. Then, the remaining space is filled with easily deformable material 8, for example, expanded clay, to exclude the influence of backfill material on pipeline 1. When seismic activity is manifested in the tectonic fault zone due to the elastic properties of pneumatic springs 4, pipeline 1 is not subjected to destructive external loads and thereby is protected from destruction.

The use of this method of constructing an underground pipeline at the intersection of tectonic faults provides the following advantages:

- increase in efficiency;

- reducing the complexity of installation;

- reducing the complexity of maintenance.

Claims (3)

1. A method of constructing an underground pipeline at the intersection of tectonic faults, including extracting a trench, installing trays in it, installing support elements with lodgements from segments of pipe segments at a certain distance, laying pipelines on lodgements, closing trays with plates, characterized in that the lodgements are fixed on pneumatic springs mounted on the axis of symmetry of the trays along the length of the pipeline with a step equal to the step of installing the pipe racks, with the possibility of pumping compressed air through them through the air odes, and after the installation of the pipeline, the remaining space is filled with easily deformable material, and the height of the air springs in the filled state and the gaps between the pipeline and the trays take more than the maximum possible predicted displacement of the pipeline. 2. The method according to claim 1, characterized in that the air springs are made of rubber cord. 3. The method according to claim 1, characterized in that claydite is used as an easily deformable material.