A pipe jacking construction method

Abstract

The present application relates to a pipe jacking construction method, which belongs to the technical field of trenchless construction, and includes the following steps: S1, determining the jacking path, excavating and constructing the launch pit and the receiving pit; S2, hoisting the mud balance tunneling machine to the inside of the launch pit, and jacking the mud balance tunneling machine; S3, hoisting the pipe section and lowering it to the launch pit; the pipe sections are jacked one by one, and the two ends of each pipe section are respectively an inserting end and an inserted end. After the inserting ends of adjacent pipe sections are inserted into the inserted ends, a receiving interval is formed between adjacent pipe sections; an airbag is inserted into the receiving interval, and the outer wall of the airbag is flush with the outer wall of the pipe section; the airbag is filled with a lubricant; the airbag is ruptured by friction during the jacking process. The present application has the effect of reducing the resistance during the jacking process of the pipe section without destroying the structure of the pipe section.

Description

Technical Field

[0001] The present application relates to the technical field of trenchless construction, and in particular to a pipe jacking construction method. Background Art

[0002] Pipe jacking construction is a trenchless construction method that can minimize the impact on buildings, traffic, environment, etc. above, while speeding up the overall construction progress.

[0003] At present, the construction process of pipe jacking is as follows: first determine the jacking route, and excavate the launch pit and the receiving pit at both ends of the jacking route. The launch pit is the beginning of the jacking, and the receiving pit is the end of the jacking. Then install the jacking equipment in the launch pit, and lower the mud balance tunnel boring machine to jack it into the soil. Then lower the pipe segments one by one for jacking until the mud balance tunnel boring machine jacks into the receiving pit. During the jacking process of the pipe segment, the head of the mud balance tunnel boring machine drills and recycles the soil in front. The recovered soil is input into the head and mixed with water before being output through the pipeline.

[0004] In order to reduce the friction between the outer wall of the pipe segment and the soil during the jacking process, an annular mud pipe is installed inside some pipe segments, and multiple ejection pipes are set on the outer wall of the mud pipe, and the ejection pipes pass through the pipe segment. During the jacking process, the mud pipe ejects mud from the ejection pipe to the outer wall of the pipe segment to lubricate the outer wall, thereby reducing the friction between the pipe segment and the soil.

[0005] The mud itself contains particles such as soil, which results in a poor lubrication effect on the outer wall of the pipe segment. However, the cost of lubricants is high, and the amount of mud used in the method of spraying mud through a mud pipe for lubrication is large. If it is replaced with lubricants, the construction cost will be greatly increased. In addition, the installation of a spray pipe on the pipe segment will also cause damage to the structure of the pipe segment itself, which will affect the strength of the pipe gallery after the construction is completed. Therefore, it is necessary to provide a pipe jacking construction method that can reduce the resistance during the jacking process of the pipe segment without damaging the structure of the pipe segment. Summary of the invention

[0006] In order to reduce the resistance during the jacking process of the pipe segment without damaging the structure of the pipe segment, the present application provides a pipe jacking construction method.

[0007] The present application provides a pipe jacking construction method, which adopts the following technical solution:

[0008] A pipe jacking construction method comprises the following steps:

[0009] S1, determine the jacking path, excavate and construct the launching pit and receiving pit;

[0010] S2, hoisting the slurry balance tunnel boring machine into the launch pit and pushing the slurry balance tunnel boring machine into place;

[0011] S3, hoist the pipe segment and lower it to the launch pit; the pipe segments are pushed in one by one, with each segment having an inserting end and an inserted end respectively. After the inserting ends of adjacent pipe segments are inserted into the inserted ends, a receiving space is formed between adjacent pipe segments; an airbag is inserted into the receiving space, with the outer wall of the airbag flush with the outer wall of the pipe segment; the airbag is filled with lubricant; the airbag is ruptured by friction during the pushing process.

[0012] By adopting the above technical solution, the airbag is filled with lubricant. When the friction between the pipe segment and the soil increases, the particles in the soil rub against the outer wall of the airbag, causing the outer wall of the airbag to rupture, and the lubricant in the airbag leaks out and covers the outer wall of the pipe segment. Since the airbag of this application is small in size, the amount of lubricant required is not large, which can reduce costs. At the same time, the outer wall of the airbag will only rupture when the pipe segment is pushed to a larger distance or the friction of the outer wall of the pipe segment increases. Therefore, the lubricant is used in a targeted manner, which not only reduces the amount used, but also reduces the resistance of the pipe segment pushing process.

[0013] Optionally, in S3, an adhesive is applied to the inner wall of the accommodation space, and then the airbag is inserted into the accommodation space.

[0014] By adopting the above technical solution, the outer layer of the ruptured airbag still covers the inner wall of the accommodating space, thereby protecting the connection position of the two pipe sections and improving the anti-seepage effect of the connection position of the two pipe sections.

[0015] Optionally, the adhesive is applied to the inner wall of the accommodation space near the mud balance tunneling machine.

[0016] By adopting the above technical solution, the front end of the airbag is fixed, so that the airbag can be destroyed quickly after encountering greater resistance, while not affecting the deformation of the rear end of the airbag. In addition, the seepage diameter between two adjacent pipe sections can be extended.

[0017] Optionally, in S2, the mud obtained after the jacking of the mud balance tunneling machine is stored in a mud transfer storage container, a flexible mud delivery pipe is connected to the mud transfer storage container, and a hard shotcrete pipe is connected to the mud delivery pipe; a hole that can pass the shotcrete pipe is reserved at the head position of the mud balance tunneling machine; in S3, before the jacking of the pipe section, the shotcrete pipe is extended to the outside of the mud balance tunneling machine to inject high-pressure mud into the soil in front of the mud balance tunneling machine.

[0018] By adopting the above technical solution, high-pressure mud is injected into the soil in front of the mud balance tunnel boring machine before the pipe segment is pushed forward, which can disturb the soil to be drilled, making the tunneling process of the mud balance tunnel boring machine smoother. At the same time, the pores under the front soil can be filled, reducing the probability of sinking of the upper building caused by the force exerted on the front soil during the jacking process of the mud balance tunnel boring machine.

[0019] Optionally, in S3, after 3-4 pipe sections are pushed in, high-pressure mud is injected into the soil in front of the mud balance tunnel boring machine using a shotcrete pipe, and this process is repeated until the head of the mud balance tunnel boring machine is drilled out of the receiving pit.

[0020] By adopting the above technical solution, high-pressure mud can be sprayed to a longer distance, so there is no need to spray each time a pipe section is pushed in, thereby improving the efficiency of the pushing.

[0021] Optionally, in S2, a guide pipe is installed inside the mud balance tunneling machine, the guide pipe is open at both ends and is hollow, and the shotcrete pipe can pass through the guide pipe to determine its path.

[0022] By adopting the above technical solution, the movement of the shotcrete pipe is guided to improve the efficiency of the shotcrete.

[0023] Optionally, a support frame is welded on the shotcrete pipe, and the guide pipe is located between the support frame and the head of the mud balance tunneling machine; a telescopic drive member is installed on the support frame to drive the shotcrete pipe to extend out of the mud balance tunneling machine or retract into the mud balance tunneling machine.

[0024] By adopting the above technical solution, the movement of the shotcrete pipe can be automatically controlled, thereby improving the shotcrete efficiency and reducing manual energy consumption.

[0025] Optionally, a slide rail is installed at the other end of the support frame, and the slide rail is installed on the inner wall of the mud balance tunneling machine, and the support frame can move along the slide rail.

[0026] By adopting the above technical solution, the structural stability of the spray pipe during movement is improved, and at the same time the load on the telescopic drive member in the vertical direction can be reduced.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects:

[0028] 1. An air bag is set between adjacent pipe sections, and the air bag is filled with lubricant, which can not only reduce the amount of lubricant used, but also can accurately lubricate at a fixed time and location;

[0029] 2. In the interval before the pipe segment is pushed in, high-pressure mud is injected into the soil in front of the mud balance tunnel boring machine to disturb the soil in front and facilitate the pushing in of the pipe segment; at the same time, the gap under the soil in front can also be pre-filled to reduce the impact of settlement caused by vibration during the later pushing process on the upper building. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0031] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the medium mud balance tunnel boring machine;

[0032] Figure 3 It is a structural schematic diagram of the connection positions between adjacent pipe sections.

[0033] In the figure, 1. launching pit; 2. receiving pit; 3. reaction wall; 31. jack; 4. steel guide frame; 5. mud balance tunneling machine; 51. guide pipe; 52. slide rail; 6. mud transfer storage container; 61. output pipe; 611. mud pump; 612. distributor; 7. mud conveying pipe; 71. shotcrete pipe; 8. support frame; 81. telescopic drive member; 9. pipe section; 91. insertion end; 92. inserted end; 93. accommodation interval; 931. airbag. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] like Figure 1 As shown, the embodiment of the present application discloses a pipe jacking construction method, comprising the following steps:

[0036] S1, determine the jacking path, lay out the beginning and end of the jacking path, and excavate the launching pit 1 and the receiving pit 2 respectively. Cast concrete walls on the side walls of the launching pit 1 and the receiving pit 2, cast a reinforced concrete bottom plate at the bottom of the launching pit 1, and cast a reaction wall 3 on the side of the launching pit 1 facing the beginning, and install a jack 31 on the reaction wall 3. Install a steel guide frame 4 for supporting the pipe segment 9 above the bottom plate.

[0037] S2, combined Figure 1 and Figure 2 , the mud balance tunnel boring machine 5 is hoisted in sections and transported to the inside of the launch pit 1, the mud balance tunnel boring machine 5 is assembled in the launch pit 1, and the mud balance tunnel boring machine 5 is pushed into the soil. The mud balance tunnel boring machine 5 drills the soil in front and mixes it with water and stores it in the mud transfer storage container 6, and the mud in the mud transfer storage container 6 is transported to the outside of the launch pit 1 through the mud pipe.

[0038] An output pipe 61 is added to the mud transfer storage container 6, a mud pump 611 is installed on the output pipe 61, and a pipe distributor 612 is installed at the end of the output pipe 61. A flexible mud delivery pipe 7 is installed on the pipe distributor 612, and a hard shotcrete pipe 71 is installed at the end of the mud delivery pipe 7. Under the pressure of the mud pump 611, the mud can be sprayed out from the shotcrete pipe 71 at high pressure.

[0039] A hole is reserved at the head of the mud balance tunneling machine 5 for passing the shotcrete pipe 71, and the same number of guide pipes 51 as the shotcrete pipes 71 are installed inside the mud balance tunneling machine 5. The two ends of the guide pipes 51 are open and hollow, and the shotcrete pipe 71 can pass through the guide pipes 51 to determine its path. The length of the guide pipe 51 around the shotcrete pipe 71 is enough for it to enter the soil in front of the mud balance tunneling machine 5, so that the shotcrete pipe 71 is always installed inside the guide pipe 51.

[0040] A support frame 8 is welded on the shotcrete pipe 71, and a guide pipe 51 is located between the support frame 8 and the head of the mud balance tunneling machine 5. A slide rail 52 is arranged at the other end of the support frame 8, and the slide rail 52 is installed on the inner wall of the mud balance tunneling machine 5, so that one end of the support frame 8 is fixed on the shotcrete pipe 71, and the other end is supported on the slide rail 52, and the support frame 8 can move along the slide rail 52, so as to better support the support frame 8. A telescopic driving member 81, such as a hydraulic cylinder, an electric cylinder, etc., is installed on the support frame 8, and the telescopic driving member 81 controls the shotcrete pipe 71 to move along the guide pipe 51, so that the shotcrete pipe 71 extends out of the mud balance tunneling machine 5 or retracts into the mud balance tunneling machine 5.

[0041] S3, start the telescopic drive 81 to extend the grouting pipe 71 to the outside of the mud balance tunneling machine 5, start the mud pump 611 to spray mud, and inject high-pressure mud into the soil in front of the mud balance tunneling machine 5. Start the telescopic drive 81 to retract and retract the grouting pipe 71 back into the mud balance tunneling machine 5. Lift the pipe section 9 to the inside of the launch pit 1, and the two ends of the pipe section 9 are the insertion end 91 and the inserted end 92 respectively. Push the pipe section 9 into the soil. Each time a pipe section 9 is pushed, the insertion end 91 of the adjacent pipe section 9 is inserted into the inserted end 92, and an accommodation space 93 is left between the insertion end 91 and the inserted end 92 of the adjacent pipe section 9.

[0042] Reference Figure 3 , apply adhesive on the inner wall of the corresponding front pipe segment 9 in the accommodating interval 93, and insert the airbag 931 into the accommodating interval 93, and the airbag 931 and the front pipe segment 9 are glued and fixed. The airbag 931 is filled with lubricant, and the lubricant can be a commercially available lubricant, such as silicone lubricant. When the airbag 931 is inserted into the accommodating interval 93, its outer wall exceeds the outer wall of the pipe segment 9 by 2-3mm. When the friction between the pipe segment 9 and the soil increases during the jacking of the pipe segment 9, the airbag 931 ruptures under the friction of the soil, and the lubricant flows out of the airbag 931 and covers the surface of the pipe segment 9. At the same time, the ruptured airbag 931 covers the accommodating interval 93 to improve the anti-seepage and connection performance between adjacent pipe segments 9.

[0043] Combination Figure 2 and Figure 3After 3-4 pipe segments 9 are pushed in, the telescopic driving member 81 is started to repeat the above-mentioned grouting process, and then 3-4 pipe segments 9 are pushed in again, and this process is repeated until the head of the mud balance tunneling machine 5 is drilled out of the receiving pit 2.

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe jacking construction method, characterized in that: The steps include: S1, determine the jacking path, excavate and construct the launching pit (1) and the receiving pit (2); S2, hoisting a mud balance tunnel boring machine (5) into the launch pit (1), and pushing the mud balance tunnel boring machine (5) forward; the mud obtained after pushing the mud balance tunnel boring machine (5) forward is stored in a mud transfer storage container (6), a flexible mud delivery pipe (7) is connected to the mud transfer storage container (6), and a hard shotcrete pipe (71) is connected to the mud delivery pipe (7); a hole is reserved at the head position of the mud balance tunnel boring machine (5) so as to allow the shotcrete pipe (71) to pass through; S3, hoisting the pipe segment (9) and lowering it to the launch pit (1); the pipe segments (9) are pushed in one by one, each of the pipe segments (9) having an insertion end (91) and an inserted end (92) at both ends, and after the insertion ends (91) of adjacent pipe segments (9) are inserted into the inserted ends (92), a receiving space (93) is formed between adjacent pipe segments (9); an air bag (931) is inserted into the receiving space (93), and the outer wall of the air bag (931) exceeds the outer wall of the pipe segment (9); the air bag (931) is filled with a lubricant; the air bag (931) is ruptured by friction during the pushing process; before pushing in the pipe segment (9), the shotcrete pipe (71) is extended to the outside of the mud balance tunnel boring machine (5) to inject high-pressure mud into the soil in front of the mud balance tunnel boring machine (5).

2. A pipe jacking construction method according to claim 1, characterized in that: In S3, an adhesive is applied to the inner wall of the accommodation space (93), and then the airbag (931) is inserted into the accommodation space (93).

3. A pipe jacking construction method according to claim 2, characterized in that: The adhesive is applied to the inner wall of the accommodation space (93) near the mud balance tunneling machine (5).

4. A pipe jacking construction method according to claim 1, characterized in that: In S3, after 3-4 pipe sections (9) are pushed in, high-pressure mud is injected into the soil in front of the mud balance tunneling machine (5) using a shotcrete pipe (71), and this process is repeated until the head of the mud balance tunneling machine (5) drills out of the receiving pit (2).

5. A pipe jacking construction method according to claim 1, characterized in that: In S2, a guide pipe (51) is installed inside the mud balance tunneling machine (5), the guide pipe (51) is open at both ends and is hollow, and the shotcrete pipe (71) can pass through the guide pipe (51) to determine its path.

6. A pipe jacking construction method according to claim 5, characterized in that: A support frame (8) is welded on the shotcrete pipe (71), and the guide pipe (51) is located between the support frame (8) and the head of the mud balance tunneling machine (5); a telescopic driving member (81) is installed on the support frame (8) to drive the shotcrete pipe (71) to extend out of the mud balance tunneling machine (5) or to retract into the mud balance tunneling machine (5).

7. A pipe jacking construction method according to claim 6, characterized in that: A slide rail (52) is installed at the other end of the support frame (8), and the slide rail (52) is installed on the inner wall of the mud balance tunneling machine (5), and the support frame (8) can move along the slide rail (52).

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