Method of trenchless installation of pipes in soil

FIELD: construction.

SUBSTANCE: method includes submersion of a pipe into soil with an open end, formation of a soil core in it and its removal from the pipe with the supplied fluid medium by means of breaking and squeezing out in parts. The fluid medium is supplied into the soil core at the outer side of the submerged pipe, using the channel of connection between the pipeline for supply of the fluid medium and the inner cavity of the submerged pipe.

EFFECT: increased efficiency due to reliability of soil core removal by means of creation of conditions to preserve integrity of a broken part of the soil core.

5 cl, 3 dwg

 

The technical solution relates to mining and construction technology and can be used for trenchless installation of underground utilities.

The known method of trenchless laying of pipelines in the ground (see NA Kershenbaum and V. Minaev. Drilling horizontal and vertical wells shock method, M Depths. 1984, p.36-37), wherein the pipe has an inbuilt hydraulic fill pipe line, made in the form of a pipe, plunge into the ground open end, is formed in the above-mentioned hydraulic fill pipe line earth core and remove it through the same hydraulic fill pipe line through isolation and expression in installments, as its formation fluid medium under pressure (compressed air)is supplied to the separation zone through the annulus between the dip tube and hydraulic fill pipe line.

The disadvantage of this method is the most anagreement process of immersion of the pipe due to the significant joint drag submersible pipes and soil core in the hydraulic fill pipe line due to the large degree of compression, which increases the friction of the soil core on the inner surface of the immersion pipe and the growth of resistance in the immersion process.

The closest in technical essence and essential features is a method of trenchless laying of the pipeline in the ground by the RF patent №2116405, 02F 5/18, op is nl. 27.07.1998, in which the tube is immersed in the soil open end formed therein earth core and remove it by tearing and squeezing through the same pipe in installments, as its formation fluid medium under pressure supplied through the injector, which is injected directly into the earth core.

The disadvantage of this method is that the location of injector inside of the tube contributes to the destruction of soil core in the process of its removal leads to depressurization extrusion cavity formed between the bottom and excavated soil core, and, ultimately, to stop soil core in the dip tube. This reduces the reliability of the process of cleaning the pipes from the soil core and method of trenchless laying of the pipeline in the ground.

Solved the technical problem is to increase the efficiency of the method for the reliable removal of the soil core by creating conditions for preserving the integrity of the excavated part of the soil core.

The problem is solved due to the fact that in the method for trenchless laying of pipes in the ground in which the pipe is immersed in the soil open end formed therein earth core and remove it from the pipe supplied fluid medium by separation and extrusion parts, the flow of fluid in the earth core is performed with the external side of the dip pipe, use the UYa channel of communication between the pipe for supplying the fluid and the internal cavity of the dip pipe.

The gap part of the soil core by the flow of fluid from the outer side of the immersed pipe improves the efficiency of the method for the reliable removal of the soil core by creating conditions for preserving the integrity of the excavated part of the soil core and the absence of any elements inside the submersible pipe.

Suitable as a communication channel to use a radial hole in the wall of the front end of the immersion pipe which is connected to the pipeline for supplying a fluid medium. This simplifies the implementation of the method and reduces time spent on preparatory work, which increases the efficiency of the method.

Suitable as a communication channel to use radial holes in the wall of the front end of the dip tube connected to the annular chamber formed by this end and a nozzle installed on it, with a pipe for supplying a fluid medium is connected to the nozzle. The nozzle will be distributed evenly around the perimeter of the fluid, which will lead to more reliable separation of part of the soil core and the preservation of its integrity.

Suitable fluid medium to serve as portions of the liquid with astringent properties, squeezing gaseous environment. Pungent liquid will seal the gaps between the immersion pipe and the excavated part of the soil core, is also imbued with earth core, and strengthen its internal communication and improve its integrity during the removal process. Submission of binding liquid portion, extruding gaseous environment, will minimize its consumption, the effort to oust the excavated part of the core will perform the following for binding liquid pipeline gaseous environment.

It is advisable to apply the fluid with anti-friction properties during the immersion pipe. The flow of fluid with lubricating properties in the zone of contact between the inner surface of the immersion pipe and the soil core as the immersion tube into the soil will reduce the resistance created by the friction, and increase the length of the open part of the soil core. This will improve the efficiency of the method by reducing cleaning cycles submersible pipe from the soil core.

The essence of the technical solution is illustrated by specific examples of the method for trenchless laying of pipes in the ground and the drawings figure 1-3.

Figure 1 shows a diagram of the isolation fluid medium part of the soil core and remove it from the dip tube with the communication channel in the form of radial holes in the wall of the front end of the immersion pipe. The vertical arrow shows the flow of the fluid in the pipeline, and the horizontal direction of application of force to the Tr shall be in the process of its dive.

Figure 2 shows the same circuit with a communication channel in the form of radial holes in the wall of the front end of the immersion pipe connected with the annular chamber formed by this end and a nozzle on it.

Figure 3 shows the same diagram with the capacity to supply liquid portion with astringent properties, squeezing gaseous environment.

The method for trenchless laying of pipes in the ground is implemented as follows.

Submersible pipe 1 (hereinafter pipe 1) open end immersed in the soil by any known method (pushing force F, shock, etc). The soil enters the inner cavity of the pipe 1 (Fig 1) and forms the earth core 2 (hereinafter - the core 2). Increasing the length of the core 2 because of the formation of dirt tube immersion tube 1 is slowed down to a complete stop. To fix the tube in the core 2 through the communication channel in the form of radial holes 3 through the pipe 4 serves the fluid, which removes the portion of the core 2. On the torn part of the core 2 force created by the pressure formed in the extrusion chamber 5. Under the action of this force the severed portion of the core 2 is extruded toward the end of the tube 1 opposite to the bottom, until logoff. Further, the described process is repeated until the complete immersion of the pipe 1.

When used as a communication channel radial holes 3 (figure 2) in the front wall is about the end of the pipe 1, connected to the annular chamber 6 formed in this end and the nozzle 7 installed on it, fluid in line 4 enters the annular chamber 6 and further to the core 2 through the radial holes 3 in the pipe 1. This allows for better separation of the core 2.

When used as a fluid liquid with astringent properties, squeezing gaseous environment, its from the tank 8 (figure 3) serves to line 4 through the communication channel in the core 2 for the separation of its parts. Liquid with astringent properties seal the gap between the inner surface of the pipe 1 and the severed part of the core 2, and impregnating the core 2, strengthen its internal communication. Further, the extrusion part of core 2 carry out gaseous environment.

You can also use the fluid with lubricating properties. Low pressure, precluding separation of the core 2, the fluid is fed through a channel in the contact zone of the core 2 with the inner surface of the pipe 1 during its dive. This serves to reduce the intensity of the immersion pipe 1 due to the decrease of the friction force in a pair of pipe - to-core and increases the length of the open side of the core 2. More than core 2 enters the inner cavity of the pipe 1 until the formation of soil plugs, the less it is necessary to make its removal.

1. The trenchless method use is ADCI pipes in the ground, when the tube is immersed in the soil open end formed therein earth core and remove it from the pipe supplied fluid medium by separation and extrusion parts, characterized in that the fluid is served in a soil core from the outer side of the immersion pipe, using the channel of communication between the pipe for supplying the fluid and the internal cavity of the dip pipe.

2. The method according to claim 1, characterized in that the quality of the communication channel using a radial hole in the wall of the front end of the immersion pipe which is connected to the pipeline for supplying a fluid medium.

3. The method according to claim 1, characterized in that the quality of the communication channel using the radial holes in the wall of the front end of the dip tube connected to the annular chamber formed by this end and a nozzle installed on it, with a pipe for supplying a fluid medium is connected to the nozzle.

4. The method according to any one of claims 1 to 3, characterized in that the fluid is served in the form of a liquid portion with astringent properties, squeezing gaseous environment.

5. The method according to any one of claims 1 to 3, characterized in that serves the fluid with anti-friction properties during the immersion pipe.



 

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