Method for repairing underwater damaged pipeline in top pipe tunneling operation

Abstract

The application discloses a kind of repair methods of underwater broken pipeline in top pipe operation of undermining, belong to pipeline repair technical field, the repair method of underwater broken pipeline in this top pipe operation of undermining includes: adjusting water hardening gel material for closing pipeline break point;According to the inner diameter of broken pipeline, adjustable support frame is prepared, and diver uses water hardening gel material and mold to repair and block pipeline break point underwater;After repair is completed, arc surface plate is attached with repair site and elongation jack rod, jack rod is in contact with pipeline inner wall, so that adjustable support frame forms support to repair site against external water pressure;Preparation diameter is slightly smaller than the reinforcing ring of pipeline inner diameter, and grouting hole is reserved on both sides of reinforcing ring;Vertical shaft and pipeline accumulated water are pumped dry, adjustable support frame is disassembled, reinforcing ring is installed to pipeline break point, and grouting hole is grouted to the gap between reinforcing ring and pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline repair technology, and in particular to a method for repairing underwater damaged pipelines during tunnel jacking operations. Background Technology

[0002] Pipe jacking is an underground pipeline laying technology that eliminates the need for ground excavation. It uses jacks to push and jacks to pull the pipe section to the designed location. The design does not require consideration of ground obstacles, can straighten bends between two points, and has a small working area. It eliminates the need for excavation and backfilling, resulting in low overall costs. It offers advantages such as not disrupting traffic, damaging roads and vegetation, and having minimal impact on the surrounding environment.

[0003] Currently, the cut-and-cover pipe jacking construction technique is widely used in urban pipeline network renovation. However, due to regional differences and complex geological conditions, sharp rocks and other factors along the pipe jacking route may cause pipe rupture during construction. This can ultimately lead to pipe jacking failures and water seepage, severely impacting the project schedule. Large amounts of groundwater may flow into the pipeline and then into the working shaft, submerging the pipe jacking equipment. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for repairing underwater damaged pipes in tunnel jacking operations, which can repair damaged sections efficiently and at low cost.

[0005] A method for repairing underwater damaged pipelines during tunnel jacking operations according to an embodiment of the present invention includes:

[0006] Step 1: Increase the pressure inside the pipe by injecting water into the shaft, so that the water level inside the shaft is higher than the water level of the water source connected to the pipe rupture point;

[0007] Step 2: Prepare the hydraulic gel material for sealing the pipe rupture point;

[0008] Step 3: Prepare an adjustable support frame according to the inner diameter of the damaged pipe. The adjustable support frame includes an arc panel that fits the inner wall of the pipe. An adjustable top rod is provided on the side of the arc panel away from the inner wall of the pipe.

[0009] Step 4: Divers use hydraulic gel material and molds to repair and seal the damaged parts of the pipe underwater;

[0010] Step 5: After the repair is completed, attach the arc panel to the repair area and extend the top rod. The top rod abuts against the inner wall of the pipe, so that the adjustable support frame provides support against external water pressure at the repair area.

[0011] Step 6: Prepare a reinforcing ring with a diameter slightly smaller than the inner diameter of the pipe, with grouting holes reserved on both sides of the reinforcing ring;

[0012] Step 7: Drain the water from the shaft and pipes, disassemble the adjustable support frame, install the reinforcing ring at the pipe damage point, and inject grout into the gap between the reinforcing ring and the pipe through the grouting hole.

[0013] The method for repairing underwater damaged pipelines in tunnel jacking operations according to embodiments of the present invention has at least the following beneficial effects: By preparing a hydraulic gel material that meets the requirements for underwater sealing, an adjustable support frame for withstanding external pressure is prepared to complete the repair of the damaged point. After the repair is completed, a reinforcing ring is installed and grouting is performed to further reinforce the repaired area. After reinforcement, normal tunnel jacking operations can continue. Using this method for repairing underwater damaged pipelines in tunnel jacking operations avoids long-term road closures and large-scale excavation. It provides a convenient, efficient, and low-cost repair method for damaged pipelines, and the repair structure is reliable, preventing recurrence of pipeline damage and leakage.

[0014] According to some embodiments of the present invention, after step 7, once the repair is completed, the damaged pipe is pushed out by continuing to push forward.

[0015] According to some embodiments of the present invention, geological information along the jacking route is investigated before jacking the pipeline, and jacking parameters are set according to the distribution of boulders.

[0016] According to some embodiments of the present invention, the stroke and jacking oil pressure of each jack in the pipe jacking machine are configured to be consistent.

[0017] According to some embodiments of the present invention, in step 1, the water level of the water source connected to the pipe rupture point is detected, so that the water level in the shaft is 0.5m to 1m higher than the water level of the water source connected to the pipe rupture point.

[0018] According to some embodiments of the present invention, in step 2, the hydraulic gel material is formed by mixing cement, sealant, putty powder and water.

[0019] According to some embodiments of the present invention, the weight ratio of cement, sealant, putty powder and water in the hydraulic gel material is 50:15:4:20.

[0020] According to some embodiments of the present invention, the push rod includes an internally threaded sleeve and an externally threaded rod, the internally threaded sleeve and the externally threaded rod being threadedly engaged, and the overall length of the push rod being adjusted by turning the externally threaded rod.

[0021] According to some embodiments of the present invention, in step 6, grouting is performed using cement and water glass grout.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a flowchart of a method for repairing underwater damaged pipelines during tunnel jacking operations according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the repair method for underwater damaged pipelines in the tunneling and jacking operation of this invention, in which an adjustable support frame is used to support the repair site;

[0026] Figure 3 yes Figure 2 The main view;

[0027] Figure 4 This is a schematic diagram of the structure for installing a reinforcing ring in the repair method of underwater damaged pipelines during tunneling and pipe jacking operations according to an embodiment of the present invention.

[0028] Figure 5 yes Figure 4 Schematic diagram of the middle reinforcing ring;

[0029] Figure 6 This is a schematic diagram illustrating the method of jacking out a damaged steel pipe during underwater pipe jacking operations in an embodiment of the present invention.

[0030] Figure label:

[0031] Shaft 100; Damaged pipe 110; Pipe breakage point 111;

[0032] Adjustable support frame 200; arc panel 210; top rod 220; internal threaded sleeve 221; external threaded rod 222;

[0033] Reinforcing ring 300; grouting hole 310. Detailed Implementation

[0034] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0036] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0038] refer to Figures 1 to 6 This invention describes a method for repairing underwater damaged pipelines during tunnel jacking operations according to embodiments of the present invention.

[0039] like Figures 1 to 6 As shown, the repair method for underwater damaged pipelines during tunnel jacking operations according to an embodiment of the present invention includes:

[0040] Step 1: Increase the pressure inside the pipe by injecting water into the vertical shaft 100, so that the water level inside the vertical shaft 100 is higher than the water level of the water source connected to the pipe rupture point 111;

[0041] Step 2: Prepare the hydraulic gel material for sealing the pipe rupture point 111;

[0042] Step 3: Prepare an adjustable support frame 200 according to the inner diameter of the damaged pipe 110. The adjustable support frame 200 includes an arc panel 210 that matches the inner wall of the pipe. An adjustable top rod 220 is provided on the side of the arc panel 210 away from the inner wall of the pipe.

[0043] Step 4: Divers use hydraulic gel material and molds to repair and seal the pipe rupture point 111 underwater;

[0044] Step 5: After the repair is completed, attach the arc panel 210 to the repair area and extend the top rod 220. The top rod 220 abuts against the inner wall of the pipe, so that the adjustable support frame 200 provides support to the repair area against external water pressure.

[0045] Step 6: Prepare a reinforcing ring 300 with a diameter slightly smaller than the inner diameter of the pipe. Grouting holes 310 are reserved on both sides of the reinforcing ring 300.

[0046] Step 7: Drain the water from the shaft 100 and the pipeline, disassemble the adjustable support frame 200, install the reinforcing ring 300 to the pipeline damage point 111, and inject grout into the gap between the reinforcing ring 300 and the pipeline through the grouting hole 310.

[0047] like Figure 6 As shown, after step 7, once the repair is complete, the damaged pipe 110 is jacked out using a continued jacking method. Pipe damage typically occurs during the jacking process, caused by interference from rocks along the jacking route. Therefore, the broken pipe is always the foremost section in the jacking direction. After repairing the damaged pipe 110, jacking continues until it is jacked out at the final shaft 100, thus replacing the damaged pipe 110 and preventing it from remaining underground. In contrast to jacking operations without pipe damage, since the foremost pipe is the damaged pipe 110, when it reaches the last working position, another section of pipe is jacked in from the starting shaft 100, pushing the damaged pipe 110 out to the final shaft 100. The damaged pipe 110 is then lifted out of the final shaft 100. This ensures that all pipes laid underground are undamaged, guaranteeing construction quality.

[0048] Before jacking the pipe, investigate the geological information along the jacking route and set the jacking parameters according to the distribution of boulders. During the jacking process, ensure that the stroke and hydraulic pressure of each jack in the pipe jacking machine are consistent.

[0049] In step 1, the water level of the water source connected to the pipe rupture point 111 is detected, and the water level in the shaft 100 is 0.5m to 1m higher than the water level of the water source connected to the pipe rupture point 111.

[0050] In step 2, the hydraulic gel material is formed by mixing cement, sealant, putty powder, and water. The weight ratio of cement, sealant, putty powder, and water in the hydraulic gel material is 50:15:4:20.

[0051] The push rod 220 includes an internally threaded sleeve 221 and an externally threaded rod 222. The internally threaded sleeve 221 and the externally threaded rod 222 are threaded together. The overall length of the push rod 220 is adjusted by turning the externally threaded rod 222. After the diver descends underwater to perform repairs, the arc panel 210 is placed against the pipe rupture point 111 to prevent the water pressure on the outside of the pipe from breaking through the repair material and causing the pipe rupture point 111 to continue leaking. After the repair is completed and the water in the shaft 100 is pumped out, grout is injected into the gap between the reinforcing ring 300 and the inner wall of the pipe through the grouting hole 310. The grouting uses cement and water glass grout.

[0052] The following specific example illustrates the repair method for underwater damaged pipelines during this tunnel jacking operation:

[0053] like Figure 6As shown, during the pipe jacking operation from the starting shaft 100 to the ending shaft 100, when the third pipe section was jacked, the first pipe section behind the jacking head suddenly perforated. Because there was a three-dimensional intersection with the completed rainwater culvert at this point, water leakage occurred in the pipe, causing the jacking head and its entire jacking equipment to be submerged, making it impossible to continue construction.

[0054] The jacking route within the pipeline was investigated to confirm the impact of boulders along the route on the pipe jacking construction. A combined pipe jacking machine, consisting of four jacks, was used on-site. It was confirmed that the four jacks were of the same model, with consistent stroke and hydraulic pressure. Inconsistent strokes among the four jacks could easily lead to pipe tilting, uneven localized stress, and stress concentration, potentially inducing pipe section rupture. The groundwater situation around the rupture point was also confirmed. The rupture point intersects with a stormwater culvert, whose outlet leads directly to the sea. With tidal changes, the water level inside the culvert rises and falls, creating a pressure difference with the rupture point in the pipe.

[0055] After investigating the cause of the above-mentioned pipe breakage, a repair method was determined and implemented. First, water was injected into the vertical shaft 100 to increase the water pressure in the pipe. The water level in the vertical shaft 100 was kept 0.5m to 1m higher than the water level of the water source connected to the pipe breakage point 111, forming a pressure difference from the inside to the outside, so as to avoid the newly repaired part being subjected to external pressure.

[0056] A hydraulic gel material is prepared according to the weight ratio of cement, sealant, putty powder, and water of 50:15:4:20. An adjustable support frame 200 is fabricated according to the inner diameter of the pipe to further help the repaired pipe withstand external pressure. The adjustable support frame 200 includes an arc panel 210 that conforms to the inner wall of the pipe. An adjustable-length top rod 220 is provided on the side of the arc panel 210 away from the inner wall of the pipe. The top rod 220 includes an internally threaded sleeve 221 and an externally threaded rod 222. The internally threaded sleeve 221 and the externally threaded rod 222 are threaded together, and the overall length of the top rod 220 is adjusted by turning the externally threaded rod 222. Divers descend underwater to repair the pipe damage point 111 with the hydraulic gel material, place the arc panel 210 against the repaired area, and press the arc panel 210 outward to the repaired area by turning the externally threaded rod 222.

[0057] Because the repair area is weak, in order to prevent the repair area from being punctured again during the subsequent jacking process, a reinforcing ring 300 is prepared according to the inner diameter of the pipe. The outer diameter of the reinforcing ring 300 is 1.33m, and a 1cm thick space is reserved between it and the inner diameter of the pipe (1.35m) for grouting. Grouting holes 310 are reserved on both sides of the reinforcing ring 300.

[0058] Drain the water from the vertical shaft 100, disassemble the adjustable support frame 200 and install the reinforcing ring 300. Inject cement and water glass grout into the gap between the reinforcing ring 300 and the inner wall of the pipe through the grouting hole 310 to complete the repair.

[0059] After the repair was completed, the first damaged pipe section 110 behind the machine head was pushed out by continuing to push forward, ensuring the construction quality.

[0060] In summary, by formulating a hydraulic gel material that meets the requirements for underwater plugging, an adjustable support frame 200 was prepared to withstand external pressure, completing the repair of the damaged point. After the repair, a reinforcing ring 300 was installed and grouting was performed to further reinforce the repaired area, allowing normal pipe jacking operations to continue. This method of repairing underwater damaged pipes in tunnel jacking operations avoids long-term road closures and large-scale excavation, providing a convenient, efficient, and low-cost repair of pipe damage point 111. Furthermore, the repair structure is reliable, preventing recurrence of pipe damage and leakage.

[0061] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for repairing underwater damaged pipelines during tunnel jacking operations, characterized in that, include: Step 1: Increase the pressure inside the pipe by injecting water into the shaft, so that the water level inside the shaft is higher than the water level of the water source connected to the pipe rupture point; Step 2: Prepare the hydraulic gel material for sealing the pipe rupture point. The weight ratio of cement, sealant, putty powder and water in the hydraulic gel material is 50:15:4:

20. Step 3: Prepare an adjustable support frame according to the inner diameter of the damaged pipe. The adjustable support frame includes an arc panel that fits the inner wall of the pipe. An adjustable top rod is provided on the side of the arc panel away from the inner wall of the pipe. Step 4: Divers use hydraulic gel material and molds to repair and seal the damaged parts of the pipe underwater; Step 5: After the repair is completed, attach the arc panel to the repair area and extend the top rod. The top rod abuts against the inner wall of the pipe, so that the adjustable support frame provides support against external water pressure at the repair area. Step 6: Prepare a reinforcing ring with a diameter slightly smaller than the inner diameter of the pipe, with grouting holes reserved on both sides of the reinforcing ring; Step 7: Drain the water from the shaft and pipes, disassemble the adjustable support frame, install the reinforcing ring at the pipe damage point, and inject grout into the gap between the reinforcing ring and the pipe through the grouting hole; After step 7, once the repair is complete, the damaged pipe is pushed out by continuing to push it out.

2. The method for repairing underwater damaged pipelines during tunnel jacking operations according to claim 1, characterized in that, Before jacking the pipeline, investigate the geological information along the jacking route and set the jacking parameters according to the distribution of boulders.

3. The method for repairing underwater damaged pipelines during tunnel jacking operations according to claim 2, characterized in that, Configure the stroke and hydraulic pressure of each jack in the pipe jacking machine to be consistent.

4. The method for repairing underwater damaged pipelines during tunnel jacking operations according to claim 1, characterized in that, In step 1, the water level of the water source connected to the pipe rupture point is detected, and the water level in the shaft is made 0.5m to 1m higher than the water level of the water source connected to the pipe rupture point.

5. The method for repairing underwater damaged pipelines during tunnel jacking operations according to claim 1, characterized in that, The push rod consists of an internally threaded sleeve and an externally threaded rod. The internally threaded sleeve and the externally threaded rod are threaded together, and the overall length of the push rod is adjusted by turning the externally threaded rod.

6. The method for repairing underwater damaged pipelines during tunnel jacking operations according to claim 1, characterized in that, In step 6, grouting is performed using cement and water glass grout.

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