SU1366606A1 - Method and apparatus for trenchless laying of pipelines - Google Patents

Abstract

The invention relates to the mining and construction sectors and makes it possible to increase the efficiency of laying in porous soils and to reduce external influences on the lateral surface of the pipeline (t). The device includes a T 1 with an annular tip (KN) 2, a development mechanism and evacuation of a soil core, a main and additional pumps for pumping fluid and an elastic casing (30) 5. Concentric KN 2 has a cylindrical casing 3. Moreover, EO 5 is tightly connected to one end with KH 2, and the other with an annular elastic cylinder 8 having a pressure valve 9. The cavity of the cylinder 8 is in communication with an additional pump. For carrying out the method using this device, a T 1 obstacle is forced through. At the same time, through a hole 8 dug in the front wall of the working excavation, a cylinder 8 is inserted and the liquid is not in it. She through the valve 9 enters the EA 5, lining the walls of the well. Next, the EO 5 expands and presses against said walls. When penetrating, the core is eroded by a stream of water, and the eroded soil is pumped out of the bottomhole cavity 15. 2 sec. f-ly, 1 ill. (C (L

Description

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The invention relates to the mining and construction sectors, in particular to the construction of trunk pipelines, namely to the trenchless laying of pipelines under roads and railways, as well as other engineering structures and barriers.

The purpose of the invention is to increase the effectiveness of laying in porous soils and reduce external influences on the side surface of the pipeline.

The essence of the method lies in the fact that the pipeline is pushed under the obstacle, the soil core is developed and evacuated, while simultaneously the wall of the well is lined with an elastic sheath and a fluid is injected into the space between the elastic shell and the pipe wall.

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The drawing shows a part of the device inserted into the soil from a working pit, a longitudinal section.

The pipeline 1 is provided at the downhole end with an annular tip 2 with a cylindrical casing 3, which is mounted concentrically with the annular tip. In the cylindrical cavity 4, bounded by pipelines 1 and casing 3, the elastic shell (stocking) 5 is tightly packed with an accordion, hermetically sealed at one end 6 with the ring tip 2, and at the other end 7 with an annular elastic balloon 8 connected through pressure valve 9 to the cavity elastic sheath (stocking) 5, while the internal cavity of the cylinder 8 is connected via a hose H with an additional pump for pumping fluid 11. The pump and other equipment are not shown conventionally in the drawing. Inside pipeline 1 there are two inventory pipelines 1 2 and 13. Pipeline 12: serves to feed water from the main pump to the bottom and ends with nozzle 14, and pipe 13 is sucked away from the bottom pulp. The bottomhole internal cavity 15, which is designed to develop the ground core water and form the ground pulp, is separated from the rest of the internal cavity of the pipeline 1 by a sealed partition 16

The operation of the device for the trenchless laying of the pipeline 1 according to the proposed method consists in the following.

The device is mounted in a working trench and, the tear in its front wall is a shallow cylindrical hole with a diameter located in

the free state of the annular elastic balloon 8, the penetration begins. Having fully pressed the casing 3 into the ground, the annular elastic cylinder 8 is inserted into the cylindrical hole, then

close it up with soil and, continuing the penetration, inject fluid under pressure through the hose 10 into the annular elastic balloon 8 and from there through the valve 9 into the elastic sheath 5.

Under the pressure of the injected fluid, the elastic sheath 5, straightening, presses against the well bottom sections, compresses and strengthens them. Under the action of fluid, friction along the lateral surface of pipeline 1 is significantly reduced, which allows penetration to a much greater length.

In the process of penetration, the soil core entering the cavity 15 is diffused by the stream of water pumped into inventory pipeline 12 and ejected from the nozzle at high speed. 14.. The eroded soil in the form of pulp is pumped out of cavity I5 through conduit 13. Dimensions of cavity 15 are chosen so that the soil is diluted with water only inside it, but in no case before the casing 3, since otherwise the formation of a cavity and sediment is possible ground.

Claims (2)

Invention Formula . 1 The method of trenchless laying of pipelines, according to which pipelines are forced under the obstacle, is being developed and evacuated by a soil core, in order to increase the effectiveness of laying in porous soils and reduce external influences on the lateral surface pipeline, simultaneously with the seller55 the walls of the well are lined with a sealed elastic sheath, and fluid is injected into the space formed between the elastic sheath and the side surface of the pipeline. 31366606 2. A device for a trenchless pump for pumping a liquid gasket of pipelines, inclusiveness, while the casing is fitted with a contour with a ring lug centered on the ring lug, and the development and evacuation mechanism is a soil-elastic casing with one end of a core core and a pump for pumping is metically connected with an annular tip, a liquid characterized by an IC, and the other end is hermetically sealed in that, in order to be effective, it is connected with a circular balloon with a gasket in porous soils and Its internal reduction of external influences on the side with the internal cavity of the balloon surface of the pipeline, it is removed through the pressure valve, while inside the cylindrical casing, the elastic cavity of the balloon communicates with the bottom shell, an annular an elastic supplement pump for injection with a cylinder with a pressure valve and additional liquid.