Method of pipe driving in soil

FIELD: mining.

SUBSTANCE: proposed method consist in driving the pipe in soil, forming the soil core in pipe face section, forcing said core by air pressure portions in annulus, cutting off the core portions to make the chamber ahead of soil core portion by displacing the soil duct in the axis of submergence. Said soil duct is composed by submersible pipe to be displaced in submergence axis by static force. Soil core portions transfer is conducted by creating vacuum at submersible pipe external end.

EFFECT: lower power intensity, lower costs.

3 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 underground utilities by the RF patent №2229566, E02F 5/18, E02D 7/10, F16L 1/028, publ. 27.05.2004, consisting in driving a pipe into the ground at the desired length in sandy loam soil plots no longer than 9, and in the clay not more than 7, its inner diameter, while its separat focus, remove the soil from the first pipe section provide her a shock, stop shock on the tube and disconnect the emphasis from the pipe after driving each plot.

The disadvantage of this method is the poor performance in the limit to zero by the end of the process, the volatility process and the inability to fully clean the pipe from the soil, because as cleaning the soil is redistributed along the entire length of the pipe, the height of the soil layer is reduced, so the friction force, providing the movement of soil on the pipe are reduced.

The closest in technical essence and essential features is a method of trenchless laying of pipelines in the ground (see Nyakishenyi and Veenai. Drilling horizontal and vertical wells shock method. M: "Nedra". 1984, p.36-37), which consists in immersing the pipe in the ground with an open front tor the Ohm, forming at its downhole part of the soil core, which is transported by a built-in dip tube hydraulic fill pipe line portions by the pressure of air entering through the annular space, the cut-off portions of the soil core and the education of the camera before the portion of the soil core by displacement of the hydraulic fill pipe line along the axis of the immersion by air pressure.

The disadvantage of this method is the most anagreement process of immersion of the pipe due to the significant joint drag submersible rough 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 pipe. The presence of the reciprocating motion of the hydraulic fill pipe line in abrasive soil environment can lead to jamming of the hydraulic fill pipe line in any position that will lead to the violation of the process of detachment and transportation of portions of the soil core. In addition, the reciprocating movement of the hydraulic fill pipe line complicates the design that implements the method.

Solved technical challenges are to reduce the energy intensity of the process of immersion pipe by reducing drag submersible pipes, to improve the reliability of separation and removal of portions of the soil core from the dip tube by moving it along the axis of the borehole from the bottom is in reducing the cost of the equipment, implements the method, through the use of vacuum instead of excessive pressure.

The problem is solved due to the fact that in the method for trenchless laying of pipes in the ground, which consists in immersing the pipe in the ground, the formation of the soil core in the downhole portion of the immersed pipe, transporting it through the hydraulic fill pipe line portions by the pressure of air entering through the annular space, the cut-off portions of the soil core and the education of the camera before the portion of the soil core by displacement of the hydraulic fill pipe line axis immersion, according to the technical solution as used submersible hydraulic fill pipe line pipe, which move along the axis of the immersion static power, and transportation portions of the soil core is carried out by creating a vacuum in the outer end of the dip pipe.

The use of hydraulic fill pipe line dip tube reduces drag due to the absence within it of hydraulic fill pipe line, and transportation portions of the soil core using a vacuum eliminates the need for compressed air to the downhole end of the immersion pipe: it is enough to have a relationship downhole end of the dip tube with the atmosphere. In addition, the cost of installations for creating a vacuum are much cheaper than similar units on the creation of excess pressure at the same flow rate.

it is Advisable in the annulus simultaneously with the immersion tube to form longitudinal channels using one or more local expanders with holes, which this chamber is connected with the annular space, mounted on the downhole end of the dip tube. Local expanders displace soil in the annulus to form longitudinal channels connecting the chamber with the atmosphere. This will increase the reliability and speed of transportation of portions of the soil core at the expense of a greater inflow of atmospheric air into the chamber.

It is after displacement submersible pipe axis immersion to make it rotate around this axis. Holes in the local extender can become clogged with soil. The specified rotation submersible pipes will allow you to communicate the chamber with the atmosphere over the whole cross section of the longitudinal channels formed by the local extender. This will increase the reliability and speed of transportation of portions of the soil core at the expense of even greater inflow of atmospheric air into the chamber.

The essence of the technical solution is illustrated by examples of specific implementations of the method and the drawings figure 1-3.

Figure 1 shows a diagram of the method for trenchless laying of pipes in the ground.

Figure 2 shows a fragment of a scheme of implementation of the method with the local extender to the downhole end of the dip pipe.

Figure 3 shows a section A-A in figure 2. The arrow indicates the direction of rotation.

The method for trenchless laying of pipes in the ground implement the following way.

Submersible pipe 1 (hereinafter pipe 1) open end immersed in the soil by any known method (pushing force F, shock, etc). The soil is included in the inner space of the pipe 1 and forms the earth core 2 (hereinafter - the core 2). Increasing the length of the core 2 is formed dirt tube, the dip tube 1 slows down until it stops. To eliminate dirt tube pipe 1 is shifted along the axis of the immersion away from the bottom for some distance. For this purpose, the pipe 1 is mounted the stop 3, the transmitting pipe 1 static power from a source 4 static forces, for example, hydraulic cylinders, mounted as shown in figure 1. Offset pipe 1 leads to a gap portion of the core 2 from the soil mass and formation chamber 5 freely from the pipe 1 space well. Using a vacuum pump 6 on the outer end of the pipe 1 create a vacuum and atmospheric air in the annular space 7 penetrating into the chamber 5, creates pressure on the core portion 2 around the pipe section 1. Under atmospheric pressure portion of the core 2 begins to move through hydraulic fill pipe line in the form of a dip pipe 1 to hit cerapiinit 8 mounted on the outer end of the pipe 1. Then cerapiinit 8, the vacuum pump 6, the stop 3 and the source 4 static force is removed and the process of immersion pipe 1 resume.

For more reliable with the connection chamber 5 with the atmosphere at the downhole end of the pipe 1 can assign one or more local extender 9 holes 10 (2 and 3). Local expanders 9 displace soil in the annulus 7 and form the longitudinal channels 11 through which atmospheric air through the openings 10 will get in the chamber 5. Because the local extender 9 are only a few places on the perimeter of the cross section of the pipe 1 and the dimensions of the minor (figure 2 and 3 they are shown in an enlarged scale for clarity), then drag pipes 1 as a whole will increase slightly, and the presence of longitudinal channels 11 will increase the reliability and speed of transportation of portions of the core 2.

The rotation of the pipe 1 (Fig 3) after its axial displacement will also increase the flow of air from the atmosphere into the chamber 5. In this case, the local extender 9 will be displaced in the direction of the circumference and discover all the cross-section of the longitudinal channels 11. This will ensure the connection of the atmosphere and the chamber 5 through the whole cross section of the longitudinal channels 11 and not only through the holes 10.

1. The method for trenchless laying of pipes in the ground, which consists in immersing the pipe in the ground, the formation of the soil core in the downhole portion of the immersed pipe, transporting it through the hydraulic fill pipe line portions by the pressure of air entering through the annular space, the cut-off portions of the soil core and the education of the camera before the portion of the soil core by displacement of the hydraulic fill pipe line axis immersion, featuring the the action scene, that as used submersible hydraulic fill pipe line pipe, which move along the axis of the immersion static power, and transportation portions of the soil core is carried out by creating a vacuum in the outer end of the dip pipe.

2. The method according to claim 1, characterized in that the annulus simultaneously with the immersion pipe form the longitudinal channels using one or more local expanders with holes, which this chamber is connected with the annular space, mounted on the downhole end of the dip pipe.

3. The method according to claim 2, characterized in that after the displacement of the submerged pipe along the axis of the immersion is carried out by its rotation around this axis.



 

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3 cl, 3 dwg

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