A pipeline repair method using two-end jacking operation

Abstract

The present invention relates to the technical field of pipeline construction and provides a pipeline repair method using two-end jacking operation, comprising the following steps: passing a drill rod through an old pipe to be repaired, installing a casing section on the left end of the drill rod, and then installing a hydraulic jacking cylinder, slidingly installing a crushing head on the right end of the drill rod, installing a new pipe section for replacing the old pipe on the right end of the crushing head, and then installing another hydraulic jacking cylinder, the two hydraulic jacking cylinders simultaneously jacking towards each other, bringing the new pipe section and the casing section closer together, until the working end of one of the hydraulic jacking cylinders approaches the well wall or completes the working stroke; resetting the working ends of the two hydraulic jacking cylinders, adding the corresponding casing section or new pipe section, and then installing the hydraulic jacking cylinder to continue jacking; and removing soil in the casing section. During the construction process of the present invention, the reaction force of the hydraulic jacking cylinder is on the drill rod, so as to avoid damaging the well wall, and the two ends of the old pipe are jacked at the same time, thereby improving the efficiency of replacing the pipeline and increasing the success rate of pipe replacement.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline repair construction, in particular to a pipeline repair method adopting two-end jacking operation. Background Art

[0002] With the further development of urbanization and the gradual improvement of rural living conditions, the demand for public infrastructure and household water supply and drainage has further increased, which is inseparable from construction work such as pipeline installation and maintenance.

[0003] Damaged pipes need to be repaired. In the trenchless repair construction of municipal drainage pipes, the diameter reduction processing method is often used, that is, a pipe with a smaller diameter than the original pipe is used to replace the old pipe. At present, for HDPE solid wall sealing pipes, the oil cylinder is used to push from one working well to another working well. This method requires the oil cylinder to be pushed against the well wall. There is a risk of damaging the well chamber during construction. In addition, during the one-way pushing process, the broken HDPE solid wall sealing pipe will gather near the crushing head under the action of the crushing head. The deeper the pushing depth, the greater the resistance at the crushing head, and the pressure on the well wall is limited. Therefore, this method can only process old pipes with a shorter stroke. Summary of the Invention

[0004] In response to the above problems, the present invention provides a pipeline repair method using two-end jacking operations to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A pipeline repair method using two-end jacking operation is characterized by comprising the following steps:

[0007] S1: Pass the drill pipe through the old pipe to be repaired so that both ends of the drill pipe are located in two corresponding working wells;

[0008] S2: A casing section is installed on the left end of the drill pipe, and then a hydraulic jacking cylinder is installed. The hydraulic jacking cylinder is fixed to the drill pipe, and its working end acts on the casing section;

[0009] S3: A crushing head is slidably mounted on the right end of the drill pipe, and a new pipe section for replacing the old pipe is mounted on the right end of the crushing head. The outer diameter of the crushing head is larger than the outer diameter of the old pipe but smaller than the inner diameter of the casing section. The inner diameter of the casing section is larger than the outer diameters of both the new pipe section and the old pipe. The new pipe section is pushed against the right side of the crushing head. Another hydraulic pipe jacking cylinder is then mounted. The hydraulic pipe jacking cylinder on the right side is fixed to the drill pipe, and its working end acts on the new pipe section.

[0010] S4: The two hydraulic jacking cylinders simultaneously push toward each other to bring the new pipe section and the casing section closer together until the working end of one of the hydraulic jacking cylinders approaches the well wall or completes the working stroke;

[0011] S5: The working ends of the two hydraulic jacking cylinders are reset, the hydraulic jacking cylinder in the operating well with a larger jacking volume is removed or both hydraulic jacking cylinders are removed simultaneously, the corresponding casing section or new pipe section is added, a jacking sleeve is installed in the space between the working end of the hydraulic jacking cylinder and the casing section or new pipe section, and then the hydraulic jacking cylinder is installed;

[0012] S6: Repeat steps S4 and S5 until the casing section meets the crushing head and the crushing head enters the casing section;

[0013] S7: remove the soil in the casing joint;

[0014] S8: Remove the hydraulic jacking cylinder at the left end and fix a jacking plate on the left end of the drill pipe, with the jacking plate resting on the wellbore wall;

[0015] S9: Repeat the following actions in the working well on the right: push the hydraulic jacking cylinder forward, reset the hydraulic jacking cylinder, remove the hydraulic jacking cylinder and casing section, install the new pipe section and casing, install the hydraulic jacking cylinder and push forward until the crushing head approaches the well wall on the left end;

[0016] S10: Remove the top plate at the left end of the drill pipe, let the crushing head pass through the working well at the casing joint and remove the crushing head, then remove the drill pipe, and the pipe replacement operation is completed.

[0017] Preferably, in step S3, one of the hydraulic pipe jacking cylinders acts on the end face of the casing section through a jacking plate, and the other hydraulic pipe jacking cylinder acts on the end face of the new pipe section through a jacking plate.

[0018] Preferably, in step S7, a mud machine is used to impact the soil in the casing joint to remove the soil.

[0019] Preferably, the two new pipe sections are spliced ​​end to end or spliced ​​using a splicing joint.

[0020] Preferably, the casing section is a stainless steel pipe.

[0021] Beneficial effects of the present invention:

[0022] During the construction process, the reaction force of the hydraulic jacking cylinder is on the drill pipe to avoid damaging the well wall;

[0023] Both ends of the old pipe are pushed in simultaneously to improve the efficiency of pipe replacement;

[0024] The drill rod is used to limit the forward direction of the crushing head to prevent the old pipe debris from mixing together and causing excessive resistance, thereby reducing the resistance at the front end of the crushing head;

[0025] Use the method of simultaneous jacking at both ends to improve the success rate of jacking through the old pipe;

[0026] One end uses a casing section with a larger outer diameter, and the other end uses a new pipe section. The casing section is inserted into the new pipe section to reduce the resistance of the new pipe section to push in.

[0027] The drill pipe limits the forward direction of the casing section and the new pipe section to avoid dislocation when the two ends are pushed in. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the present embodiment;

[0029] Figure 2 It is a schematic structural diagram of this embodiment during jacking operation. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described below with reference to the accompanying drawings and embodiments.

[0031] Reference Figures 1 to 2 The present invention provides a pipeline repair method using two-end jacking operations, comprising the following steps:

[0032] S1: Pass the drill pipe 1 through the old pipe 2 to be repaired, so that both ends of the drill pipe 1 are located in two corresponding working wells. The old pipe 2 between the two working wells needs to be replaced;

[0033] S2: A casing section 3 is installed on the left end of the drill pipe 1. Two adjacent casing sections 3 are connected end to end. A hydraulic jacking cylinder 4 is then installed. The hydraulic jacking cylinder 4 is fixed to the drill pipe 1, and its working end acts on the casing section 3. The casing section 3 is made of a relatively strong material, preferably stainless steel, and is directly pressed into the wellbore wall.

[0034] S3: The right end of the drill pipe 1 is slidably mounted with a crushing head 5, which can slide smoothly in the drill pipe 1. A new pipe section 6 for replacing the old pipe 2 is mounted on the right end of the crushing head 5. The two new pipe sections 6 are spliced ​​end to end or spliced ​​with a splicing joint 7. The outer diameter of the crushing head 5 is larger than the outer diameter of the old pipe 2 but smaller than the inner diameter of the casing section 3. The crushing head 5 is restricted in its radial movement along the drill pipe 1 in the drill pipe 1. The inner diameter of the casing section 3 is larger than the outer diameters of the new pipe section 6 and the old pipe 2. The new pipe section 6 is pushed against the right side of the crushing head 5, and another hydraulic jacking cylinder 4 is installed. The hydraulic jacking cylinder 4 on the right side is fixed to the drill pipe 1, and its working end acts on the new pipe section 6. The new pipe section 6 pushes the crushing head 5 to the left. One hydraulic jacking cylinder 4 acts on the end face of the casing section 3 through a push plate 8, and the other hydraulic jacking cylinder 4 acts on the end face of the new pipe section 6 through a push plate 8. The crushing head 5 can tear the old pipe 2 during the jacking process;

[0035] S4: The two hydraulic jacking cylinders 4 simultaneously push toward each other to bring the new pipe section 6 and the casing section 3 closer together, until the working end of one of the hydraulic jacking cylinders 4 approaches the well wall or completes its working stroke, and the two hydraulic jacking cylinders 4 stop working;

[0036] S5: The working ends of the two hydraulic jacking cylinders 4 are reset, the hydraulic jacking cylinder 4 in the operating well with a larger jacking volume is removed or both hydraulic jacking cylinders 4 are removed simultaneously, and the corresponding casing section 3 or new pipe section 6 is added. A matching number of jacking sleeves 9 are installed in the empty space between the working end of the hydraulic jacking cylinder 4 and the casing section 3 or new pipe section 6, and then the hydraulic jacking cylinder 4 is installed.

[0037] S6: Repeat steps S4 and S5 until the casing section 3 meets the crushing head 5, the inner diameter of the casing section 3 is larger than the outer diameter of the crushing head 5, and the crushing head 5 enters the casing section 3;

[0038] S7: Remove the soil in the casing section 3. Remove the hydraulic jacking cylinder 4 at one end of the casing section 3. Use a mud machine to impact the soil in the casing section 3 to remove the soil. After the soil in the casing section 3 is removed, the resistance to the forward movement of the crushing head 5 can be reduced.

[0039] S8: Remove the hydraulic jacking cylinder 4 at the left end and fix a top plate 8 to the left end of the drill pipe 1. This top plate 8 has a larger area and is pressed against the wellbore wall.

[0040] S9: Repeat the following steps for the working well on the right: push in the hydraulic jacking cylinder 4, reset the hydraulic jacking cylinder 4, remove the hydraulic jacking cylinder 4 and the casing, install the new pipe section 6 and the corresponding number of jacking sleeves 9, install the hydraulic jacking cylinder 4 and push in, until the crushing head 5 approaches the well wall on the left end;

[0041] S10: Remove the top plate 8 at the left end of the drill pipe 1, fix the drill pipe 7 at the left end, and continue to push the hydraulic jacking cylinder 4 at the right end to allow the crushing head 5 to pass through the working well at the casing section 3 and remove the crushing head 5. Then remove the drill pipe 1, and the pipe replacement operation is completed.

[0042] During the construction process, the present invention has the following advantages: the reaction force of the two hydraulic jacking cylinders 4 is on the drill pipe 1, and the end with less resistance at both ends of the drill pipe 1 is pushed inward to avoid damaging the well wall; both ends of the old pipe 2 are pushed at the same time to improve the efficiency of replacing the pipeline; the forward direction of the crushing head 5 is limited by the drill pipe 1 to avoid the crushing head 5 from swinging radially along the drill pipe 1, and to avoid the debris of the old pipe 2 being mixed together to cause excessive resistance, thereby reducing the resistance at the front end of the crushing head 5; the two ends of the drill pipe 1 are pushed toward each other at the same time to improve the success rate of jacking through the old pipe 2; a casing section 3 with a larger outer diameter is used at one end, and a new pipe section 6 is used at the other end, and the casing section 3 is sleeved on the new pipe section 6 to reduce the resistance of the new pipe section 6 to be pushed forward; the forward direction of the casing section 3 and the new pipe section 6 is limited by the drill pipe 1 to avoid dislocation when the two ends are pushed forward.

[0043] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they cannot be understood as limiting the present invention.

[0044] The above detailed description of one embodiment of the present invention focuses on a pipeline repair method using two-end jacking. However, the description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any equivalent variations and improvements made within the scope of the present invention are intended to fall within the scope of the present invention.

Claims

1. A pipeline repair method using two-end jacking operation, characterized by: The following steps are included: S1: Pass the drill pipe through the old pipe to be repaired so that both ends of the drill pipe are located in two corresponding working wells; S2: A casing section is installed on the left end of the drill pipe, and then a hydraulic jacking cylinder is installed. The hydraulic jacking cylinder is fixed to the drill pipe, and its working end acts on the casing section; S3: A crushing head is slidably mounted on the right end of the drill pipe, and a new pipe section for replacing the old pipe is mounted on the right end of the crushing head. The outer diameter of the crushing head is larger than the outer diameter of the old pipe but smaller than the inner diameter of the casing section. The inner diameter of the casing section is larger than the outer diameters of both the new pipe section and the old pipe. The new pipe section is pushed against the right side of the crushing head. Another hydraulic pipe jacking cylinder is then mounted. The hydraulic pipe jacking cylinder on the right side is fixed to the drill pipe, and its working end acts on the new pipe section. S4: The two hydraulic jacking cylinders simultaneously push toward each other to bring the new pipe section and the casing section closer together until the working end of one of the hydraulic jacking cylinders approaches the well wall or completes the working stroke; S5: The working ends of the two hydraulic jacking cylinders are reset, the hydraulic jacking cylinder in the operating well with a larger jacking volume is removed or both hydraulic jacking cylinders are removed simultaneously, the corresponding casing section or new pipe section is added, a jacking sleeve is installed in the space between the working end of the hydraulic jacking cylinder and the casing section or new pipe section, and then the hydraulic jacking cylinder is installed; S6: Repeat steps S4 and S5 until the casing section meets the crushing head and the crushing head enters the casing section; S7: remove the soil in the casing joint; S8: Remove the hydraulic jacking cylinder at the left end and fix a jacking plate on the left end of the drill pipe, with the jacking plate resting on the wellbore wall; S9: Repeat the following actions in the working well on the right: push the hydraulic jacking cylinder forward, reset the hydraulic jacking cylinder, remove the hydraulic jacking cylinder and casing section, install the new pipe section and casing, install the hydraulic jacking cylinder and push forward until the crushing head approaches the well wall on the left end; S10: Remove the top plate at the left end of the drill pipe, let the crushing head pass through the working well at the casing joint and remove the crushing head, then remove the drill pipe, and the pipe replacement operation is completed.

2. The pipeline repair method using two-end jacking operation according to claim 1 is characterized in that: In step S3, one of the hydraulic pipe jacking cylinders acts on the end face of the casing section through a jacking plate, and the other hydraulic pipe jacking cylinder acts on the end face of the new pipe section through a jacking plate.

3. The pipeline repair method using two-end jacking operation according to claim 1 is characterized in that: In step S7, a mud machine is used to impact the soil in the casing section to remove the soil.

4. The pipeline repair method using two-end jacking operation according to claim 1 is characterized in that: The two new pipe sections are spliced ​​end to end or spliced ​​using a splicing joint.

5. The pipeline repair method using two-end jacking operation according to claim 1 is characterized in that: The casing joint is a stainless steel pipe.

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