RU1796003C - Method for trenchless pipeline laying - Google Patents

Abstract

SUMMARY OF THE INVENTION: A method according to which a pipe with an open front end is immersed in soil by applying an impact load to its rear end. The internal cavity of the pipe is cleaned of soil by a self-propelled soil-sampling device with a pneumatic shock drive to move it. The movement of the soil pickup device in the forward and reverse directions is carried out under the influence of the shock load on the immersed pipe. After filling the soil intake device with soil, the drive of its movement is switched off. 1 ill.

Description

The invention relates to the technology of building production, in particular to trenchless laying of underground utilities, can be used for trenchless laying of casings from steel pipes.

A method is known for trenchless laying of an underground pipeline by immersing a pipe with an open front end in the ground by an impact load applied to the front end of the pipe, and removing soil from it by a chipper that moves inside the pipe with a winch. An impact immersion load is transmitted to the pipe from a vibro-impact drive mounted on the chipper through a vertical longitudinal plate on the chipper and its corresponding splitter plate fixed to the front of the immersion pipe. The presence in the bottom of the pipe-divider and baits with a vertical plate causes compaction of the soil entering the pipe. This leads to the formation of a soil plug and a sharp increase in resistance to pipe movement. In addition, the non-rigid connection of the vibro-impact drive with the pipe reduces the efficiency of transmission of the shock pulse to the pipe.

Also known is a method that does not have the above disadvantages. According to this method, a pipe with an open front end is immersed in the soil by applying an impact load to its rear end face, and then the interior of the pipe cavity is cleaned of soil by a self-propelled soil sampling device with an air-shock drive to move it. Work on this method is performed in the following sequence. A shock mechanism is attached to the rear end of the pipe and immersed in soil. In this case, the soil enters the internal cavity of the pipe. After immersion, its internal cavity is cleaned of soil. During cleaning, the impact on the pipe is stopped. To do this, the impact mechanism is disconnected from the clogged pipe, a self-propelled soil pickup device is mounted on the guide frame, and it is started

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inside the pipe. Moving inside the pipe, the soil sampling device moves to the soil and penetrates into it, collecting soil. After that, the drive of the soil sampling device is reversed, and the device returns from the soil pipe to the workplace.

When using a self-discharging soil sampling device, it is unloaded from the soil after switching it to the forward stroke. The cyclic operation of the soil sampling device continues until the clogged pipe section is completely cleaned. After that, the soil intake device is removed, the pipe is built up, if necessary, the shock mechanism is attached to it and the immersion is resumed. In a number of cases, the equipment needs to be rebuilt from clogging to cleaning and vice versa several times during the process of immersing one section of the pipe. The sequence of operations for immersion of the pipe and its cleaning from the soil, the need for repeated adjustment of the equipment are the disadvantages of this method, since this reduces the productivity of the process and requires significant energy consumption for moving the soil sampling device with soil. Energy costs also increase due to the fact that the length of the soil core entering the pipe increases as it is immersed, and during interruptions in the immersion of the pipe associated with its cleaning, the resistance of the soil mass to the movement of the pipe increases, as it occurs consolidation, suction pipe.

The aim of the present invention is to increase the productivity of laying a pipeline while reducing the energy consumption of the laying process. This goal is achieved in that in the method of trenchless laying of the pipeline in the soil, according to which a pipe with an open front end is immersed in the soil by applying an impact load to its rear end face and the internal cavity of the pipe is cleaned from the soil by a self-propelled soil-intake device with pneumatic shock drive for moving it, according to the invention , the movement of the soil intake device in the forward and reverse direction is carried out under the influence of the shock load on the immersed pipe, and after filling the soil intake devices with a ground drive to displace it.

In this case, the movement of the soil sampling device with soil backward through the pipe occurs due to the energy spent on elastic deformation of the soil when the pipe is immersed, which leads to a reduction in energy consumption. Reducing equipment conversion breaks also reduces energy costs by reducing soil resistance. Energy costs are also reduced.

by reducing the mass of soil in the submersible pipe, since the soil is constantly removed during the immersion of the pipe. The productivity of the pipeline process is not only increased

by combining the operations of immersing the pipe and removing soil from it, but also by increasing the speed of the immersion of the pipe, caused by a decrease in the resistance of the soil outside and inside the pipe to its movement. Eliminating the time spent on equipment retooling also improves productivity.

The drawing shows a submersible pipe in a longitudinal vertical section in

0 moment of soil collection using a soil sampling device.

The proposed method is implemented as follows.

A laid pipe 2 is installed on the guide frame 1. Inside the pipe 2, a self-propelled self-unloading soil sampling device 3 with a shock drive 4 is installed. A shock mechanism 6 is connected to the rear end of the pipe 2 by means of a transition device 5 at 0 and put it into operation. As the impact mechanism b, a pneumatic impact machine (pneumatic punch) can be used. Under the influence of the shock mechanism 6 impacts 6 pipe 2 is immersed in the ground. In this case, through the open front end of the pipe 2, the soil 7 enters the pipe 2. Simultaneously with the inclusion of the shock mechanism 6 includes a shock drive

0 of the soil sampling device 3. Under the influence of the shock load, the soil sampling device 3 moves forward along the pipe 2 and penetrates into the soil 7, collecting it. As you know, the vibration effect on

5 of the pipe wall reduces its adhesion to the ground, which reduces the resistance to penetration of the pipe into the ground. In this case, the vibration effect on the pipe 2 creates a shock drive 4 of the soil intake

0 devices 3. After soil collection, the drive 4 of the soil sampling device 3 is turned off while continuing to immerse the pipe 2 into the soil. When immersed, the pipe 2 makes a reciprocating motion. After each

5 of the impact, under the influence of the shock load, the pipe 2 moves forward, and then, under the action of the elastic forces of the soil, a certain distance back. Under the influence of these vibrations of the pipe 2, the soil sampling device 3 moves backward, transporting the soil to

the rear end of the pipe. After moving the soil sampling device 3 to its extreme rear position, the drive 4 of the soil sampling device 3 is activated and it starts to move forward. In this case, the soil remains in place, is unloaded from the soil sampling device and stored at the rear end of the pipe 2. Under the influence of the reciprocating vibrations of the pipe 2, the soil 8 is moved back and removed from the pipe 2 through the windows 9 in the pipe wall and / or through the windows 10 to adapter 5. Further, the cycles of movement of the soil sampling device 3 are repeated when the pipe 2 is continuously immersed in shock.

Thus, the movement of the soil sampling device with soil backward through the pipe occurs due to the energy spent on elastic deformation of the soil when the pipe is immersed, which leads to a reduction in energy consumption. A reduction in energy consumption is also caused by a decrease in the resistance of the soil to the penetration of the pipe due to vibration effects on the pipe and due to the elimination of technological interruptions in cleaning the pipe from the soil, which caused the consolidation of the soil layer adjacent to the side surface of the pipe. The constant destruction of the soil plug entering the pipe also leads to a decrease in energy consumption and an increase in the rate of pipe loading.

By increasing the speed of immersion of the pipe for the above reasons, as well as by combining the operations of immersing the pipe and cleaning it from the ground, the productivity of laying pipelines is increased.

Using the proposed method will reduce energy consumption by 10-12%, due to this, accordingly, increase the length of the laid section of the pipeline or its diameter without increasing the power of the impact mechanism, increase productivity by 15-30%.

Claims (1)

The claims The method of trenchless laying of the pipeline in the ground, according to which a pipe with an open front end is immersed in the ground by applying an impact load to its rear end face, and the internal cavity of the pipe is cleaned of soil by a self-propelled soil sampling device with pneumatic shock drive to move it, I distinguish and with the fact that, in order to increase the productivity of laying the pipeline while reducing the energy consumption of the laying process, the movement of the soil sampling device in the forward and reverse directions is carried out under the influence of the shock load on the immersed pipe, and after filling the soil sampling device with soil, the drive moves it disconnect.