RU2528465C1 - Method of trenchless replacement of underground pipelines - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method includes creation of a well along the specified line of drilling and installation of a pipeline. Contact forces are transferred to a drilling device via a pipeline made from assembled round reinforced concrete rings connected in series along with well construction, having in the inner cavity the location beds for placement of a replaced and a new pipeline on them. The drilling device is made as longitudinal and split with a cross section in the form of a ring with inner diameter more than the external diameter of the replaced pipeline with capability of sludge movement in the space between the inner cavity of assembled rings and outer surface of the replaced pipeline. The drilling device at the inner side is equipped with guide rollers. A cutting tool is placed in the front end part of the drilling device. High-pressure nozzles, from which drilling mud is injected, are placed in gaps between the cutting tool.

EFFECT: integrity of a replaced pipeline and possibility to use it for other needs.

6 dwg

Description

The invention relates to the field of pipeline transport and can be used for trenchless replacement of underground pipelines.

As practice shows, there are situations in which the replacement of pipelines by traditional, trenching methods is not possible for technical, environmental and other reasons. For example, such situations may arise on sections of the pipeline route with difficult construction and installation works (mountainous, marshy terrain, territories with special environmental requirements).

When reviewing the technical literature, technical solutions were identified that relate to trenchless laying of pipelines when replacing them.

A known method of trenchless replacement of pipelines is to eliminate the old pipeline and tighten the new pipeline through a previously completed installation well, which is formed by driving a hollow metal pipe in soft or bulk and alluvial soils (see RU 2105919, class F16L 1/00 of 23.02. 1996).

The disadvantages of this method are: the inability to use a replaceable pipeline for other needs due to its elimination by destroying and ramming the fragments of the pipeline into the ground, the high probability of mechanical damage to the new pipeline from friction on the fragments of the destroyed old pipeline in the process of tightening the new pipeline into the installation well, causing environmental damage from the remnants of the product located in the replaced pipeline, the need to build an installation well and the pipeline for each successive replacement, the need for significant traction to overcome the friction forces during the destruction of the old pipeline and tightening the new pipeline into the installation well.

A device is known for trenchless replacement of underground pipelines, comprising interconnected pipe-breaking organ with a knife, a guiding device, a traction element and an expander for increasing the diameter of the well, pressing fragments of the destroyed pipe into the surrounding soil and tightening a new pipeline, axial and interconnected radial channels for supplying lubricant, a ring with a gap for spraying lubricant, behind the expander is installed with tool for vibration of a new pipeline connected to an expander and a dismantling cable (see RU 2473833, CL F16L 1/028, F16L 55/18 of 03/03/2011).

The disadvantages of this device are: the inability to use the replaceable pipeline for other needs due to its destruction, the high probability of mechanical damage to the insulation coating of the new pipeline from friction on the fragments of the destroyed old pipeline during the tightening of the new pipeline into the installation well, causing environmental damage from product residues located in replaceable pipeline, the need for the construction of an installation well and the destruction of the pipeline at each stage its replacement.

The closest technical solution to the invention is a method and device for trenchless pipe laying, which consists in creating a well using a drilling device connected to a pre-assembled pipeline, pushing the pipeline simultaneously while drilling the well, hydraulically removing the sludge generated during drilling, filling the annular space with liquid formed between the pipeline and the wall of the well during drilling (see RU 2392389, class E02F 5/18, Е21В 7/00, F16L 1/028 of 01/19/2007).

The disadvantages of this method are: the impossibility of its use when replacing the old pipeline with a new pipeline, the complexity of the design of the device for trenchless pipe laying, the high probability of mechanical damage to the insulation coating of the new pipeline from the forces applied by the pusher to the pipeline, the need to re-build the well to replace the old pipeline with a new pipeline.

The problem solved in the invention is to develop a technical solution that enables the subsequent use of the replaceable pipeline for other needs and simplifies the design of the device for trenchless pipe laying.

The technical result of the invention is to reduce the likelihood of mechanical damage to the replaced pipeline during tunneling operations, to preserve the insulation of the new pipeline from damage when it is placed in the well, and to make it possible to repeatedly replace the pipeline without first constructing a well for it.

The problem is solved, and the technical result is achieved by the fact that in the method of trenchless replacement of underground pipelines, including operations to create a well along a given line of drilling and laying a pipeline, transferring the necessary contact forces for drilling and laying the drilling device through the pipeline, connecting the front end of the pipeline to the drilling device through the connecting module, exerting force externally to the pipeline using a pipe pushing device, pushing the pipe from point to a given point, removing the sludge formed during drilling, and transporting it from the well hydraulically, continuously filling the annular space formed between the pipeline and the wall of the well with liquid during drilling, performing a drilling operation and a laying operation at the same time, driving a cutting tool, at least one drive located in the well, the implementation of the drilling device, at least two connected modules connected not rigidly with, at least three guide cylinders, making high pressure nozzles on the cutting tool of the drilling device from which the drilling suspension is pumped under high pressure, making holes in the connecting module through which the annular space between the pipeline and the borehole wall is filled with the drilling suspension, according to the invention, the pipeline , through which power is transmitted to the drilling device, is made of prefabricated rings connected in series as the well is constructed, having x in the inner cavity of the lodgement for placement of a replaceable and a new pipeline on them, prefabricated rings are made mainly of reinforced concrete structures of circular cross-section to ensure tight joints between them, the drilling device is performed in a longitudinally detachable design with a cross section in the form of a ring having an inner diameter larger than the outer diameter of the replaced pipeline with the possibility of moving the sludge in the space between the internal cavity of the prefabricated rings and the outer surface is replaced of the pipeline, the drilling device is provided with rolling elements on the inside, mainly in the form of rollers, the pressure exerted on the pushed pipe and the drilling device is applied to the back of the last of the assembled rings placed in the well, the cutting tool is placed equidistant from each other in the front end part of the drilling devices, and high-pressure nozzles are placed in between the cutting tool.

Figure 1-6 shows a method that implements the proposed technical solution.

Figure 1 shows a schematic diagram of the installation of a drilling device on a replaceable pipeline.

Figure 2 shows a schematic diagram of a pipeline from prefabricated rings.

Figure 3 shows a schematic diagram of the dismantling of the drilling device.

Figure 4 schematically shows a drilling device.

Figure 5 schematically shows the placement of the drilling device on a replaceable pipeline.

Figure 6 shows a schematic diagram of the laying of a new pipeline.

1-6, the following notation is used:

1 - replaceable pipeline;

2 - starting pit;

3 - receiving pit;

4 - drilling device;

5 - lifting gear

6 - prefabricated ring;

7 - pipe pushing device;

8 - cutting tool;

9 - end nozzle;

10 - side nozzle;

11 - connector drilling device;

12 - rolling element;

13 - supply path;

14 - a receiving path;

15 - traction device;

16 - a new pipeline.

The proposed method is implemented as follows.

At the beginning of the replaced pipeline 1, a starting pit 2 is being constructed, at the end, a receiving pit 3. A piece of the replaced pipe 1 located in the starting pit 2 is cut to a length about 2 meters less than the length of the starting pit 2. In the wall of the starting pit 2, which is in the opposite to the side of the protruding part of the replaced pipe 1, a pipe pushing device 7 is installed, the pressure elements of which are brought to the back of the squeezable assembly ring 6. On the protruding 2 hours st replaced pipeline 1 by the lifting mechanism 5 is mounted drilling device 4 having a longitudinal slot 11. To the end part of the drilling device is fixed during the first movement prefabricated ring 6. To operate the drilling device 4 uses the principle of operation microtunneling conventional drilling device. The cutting tool 8 is driven by a drive mounted in the first in the direction of travel module of the drilling device 4, the kinetic energy to which is mainly hydraulic, is supplied using flexible conductors, mainly hoses, placed in the inner space between the replaced pipe 1 and the pipe from prefabricated rings 6. For erosion of the soil developed by the cutting tool 8, the pressure of the drilling slurry supplied to the end nozzles 9 of the drilling device 4 with with the help of a feed line placed in the inner space between the replaced pipe 1 and the pipe from the prefabricated rings 6. The cuttings are removed due to the hydraulic pressure of the drilling slurry coming from the end nozzles 9 through the internal space between the replaced pipe 1 and the pipe from the prefabricated rings 6. For to reduce the friction force arising between the pipe from the prefabricated rings 6 and the surface of the well, a drilling suspension is supplied through side nozzles 10 made on the side surface of the second in the direction of movement of the module of the drilling device 4. The movement of the drilling device 4 and the assembly ring 6 is carried out due to the force exerted by the device for pushing the pipes 7 to the last assembly ring 6. As the assembly ring 6 enters the well, the next assembly ring 6 is attached to it, and the cycle the punching of the drilling device 4 with the pipeline of prefabricated rings 6 is repeated. In this case, the replaced pipe 1 is placed in the inner cavity of the prefabricated rings 6 equipped with rolling elements 12, thereby reducing the likelihood of damage to the insulation coating of the replaced 1 and the new pipe. After the drilling device 4 is inserted into the receiving pit 3, its connector 11 is disconnected, and the drilling device 4 is removed from the receiving pit 3 by means of a lifting mechanism 5. The starting 2 and receiving 3 pits are equipped with supply 13 and receiving 14 tracks. The dismantled part of the replaced pipeline 1 is cut and pulled out of the internal cavity of the pipeline from the prefabricated rings 6 using the traction device 15, and a new pipeline 16 is dragged into its place.

As a result of the implementation of the proposed technical solution is provided:

the safety of the replaced pipeline in the interests of its subsequent use for other needs;

simplification of the design of the device for trenchless replacement of the underground pipeline;

safety from damage to the insulation coating of the new pipeline when it is placed in the well;

the ability to repeatedly replace the pipeline without first constructing a well for it.

Claims (1)

A method for trenchless replacement of underground pipelines, including operations to create a well along a given line of drilling and laying a pipeline, transferring the necessary contact forces for drilling and laying the drilling device through the pipeline, connecting the front end of the pipeline to the drilling device through a connecting module, exerting force from the outside with the help of pipe pushing devices, pushing the pipeline from a starting point to a predetermined point, removing drilling cuttings, and hydraulically transporting it from the well, continuously filling the annular space between the pipeline and the wall of the well with liquid while drilling, performing the drilling operation and laying operations at the same time, carrying out the cutting tool drive with at least one drive located in the well, performing a drilling device of at least two connected modules connected not rigidly with at least three guide cylinders, execution on a cutting tool the drilling device of the high pressure nozzles from which the drilling suspension is pumped under high pressure, making holes in the connecting module through which the annular space between the pipeline and the wall of the well is filled with drilling suspension, characterized in that the pipeline through which the force is transmitted to the drilling device from prefabricated rings connected in series as the well is constructed, having lodges in the internal cavity for placement of a replaceable and a new tubing on them gadfly, prefabricated rings are made mainly of reinforced concrete structures of circular cross-section to ensure tight joints between them, the drilling device is made in a longitudinally detachable design with a cross section in the form of a ring having an inner diameter larger than the outer diameter of the replaced pipeline with the possibility of moving the sludge in the space between the internal cavity prefabricated rings and the outer surface of the replaced pipeline, the drilling device from the inside is provided with guides e rolling elements, mainly in the form of rollers, the force of pressure on the pushed pipeline and the drilling device is applied to the back of the last of the assembled rings placed in the well, the cutting tool is placed equidistant from each other in the front end part of the drilling device, and high-pressure nozzles are placed between cutting tool.

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