Pipe jacking construction device and method for high underground water level environment

Abstract

The invention provides a pipe jacking construction device and method for a high-underground-water-level environment. The pipe jacking construction device for the high-underground-water-level environment comprises a fixed base, a movable jacking pipe, a driving assembly, a smashing drill bit and a power structure. And a track is arranged on the fixed base. And the movable jacking pipe can be in sliding contact with the track. The driving assembly drives the movable jacking pipe to move in the length direction of the track. The smashing drill bit is coaxially and rotationally arranged at the head end of the movable jacking pipe and connected with the slurry supply module and the slag discharging module. The smashing drill bit is provided with an annular smearing part, and the annular smearing part can evenly smear the slurry conveyed by the slurry supply module between the movable jacking pipe and the soil body. And the power structure is fixedly arranged in the movable jacking pipe and is movably connected with the crushing drill bit. According to the pipe jacking construction device for the high-underground-water-level environment, it can be guaranteed that slurry for supporting is evenly smeared between the movable jacking pipe and the soil body in time along with rotation of the smashing drill bit, the pipe jacking construction device can adapt to the high-underground-water-level environment, and practicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe jacking construction, and in particular relates to a pipe jacking construction device and method for a high groundwater level environment. Background Art

[0002] Pipe jacking is an underground construction method, mainly used for laying underground facilities such as pipelines and passages. This method sets up a working well on the ground, and then uses special equipment to push the pipeline or tunnel underground. It usually does not require large-scale excavation of the ground, which can reduce the impact on the surface environment. It overcomes the friction between the pipeline and the surrounding soil by using the jacking force generated by the jacking equipment in the working pit, pushes the pipeline into the soil according to the designed slope and direction, and transports the soil away. After one section of the pipe is pushed into the soil layer, the second section of the pipe is lowered to continue pushing.

[0003] In the prior art, when pipe jacking construction is carried out in a high groundwater level environment, the cut soil is usually continuously discharged as the pipe jacking construction device (pipe jacking machine) moves forward, and after the pipe jacking construction device passes, the mud used as support is pressurized between the outer wall and the soil. However, in a high groundwater level environment, due to the influence of groundwater, the formation is prone to instability and unsmooth excavation, making construction difficult. The above-mentioned method of injecting mud between the pipe jacking and the soil cannot ensure that the mud is constructed synchronously and quickly, and thus cannot ensure timely support. At the same time, the supporting mud needs to be injected manually, and the construction speed cannot be increased, so it cannot adapt to the high groundwater level environment and has poor adaptability. Summary of the invention

[0004] The embodiments of the present invention provide a pipe jacking construction device and method for a high groundwater level environment, aiming to solve the problem of poor adaptability of existing pipe jacking construction devices due to their inability to adapt to a high groundwater level environment.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a pipe jacking construction device for a high groundwater level environment, comprising: A fixed base is arranged at the bottom of the working pit, and a track is arranged on the fixed base along the direction to be excavated; A movable jacking pipe is located on the fixed base and can be in sliding contact with the track; A driving assembly, fixedly mounted on the fixed base and connected to the tail of the mobile jacking pipe, so as to drive the mobile jacking pipe to move along the length direction of the track; A crushing drill bit is coaxially rotatably arranged at the head end of the mobile jacking pipe, and the crushing drill bit is connected to the mud supply module and the slag discharge module; the crushing drill bit has an annular smearing portion, and the annular smearing portion is used to evenly smear the mud delivered by the mud supply module between the mobile jacking pipe and the soil; The power structure is fixedly arranged in the movable jacking pipe and is dynamically connected with the crushing drill bit.

[0006] In a possible implementation, the movable jacking pipe is detachably connected to the driving assembly.

[0007] In a possible implementation, the driving component includes: A fixed plate, fixed on the fixed base and arranged along the vertical direction; A connecting ring is arranged parallel to and spaced from the fixing plate; the connecting ring is connected to the movable jacking pipe; There are multiple telescopic structures, each of which is located between the fixed plate and the connecting ring, and the two ends of each telescopic structure are respectively connected to the fixed plate and the connecting ring.

[0008] In a possible implementation, the crushing drill bit includes: A rotating shaft is coaxially rotatably arranged on a first partition plate arranged inside the movable jacking pipe; an end of the rotating shaft extending out of the movable jacking pipe is connected to a cutting tool set; A rotating drum is coaxially rotatably arranged on the second partition plate arranged at the head end of the movable top pipe; a plurality of discharge ports are arranged in an annular manner on the outer wall surface of the rotating drum, and each of the discharge ports is provided with an elastic scraper plate that can be turned outward; each of the discharge ports and each of the elastic scraper plates are combined to form an annular coating portion; An inner sleeve is coaxially rotatably arranged on the second partition plate and is located inside the rotating drum. An annular flange is provided at one end of the inner sleeve away from the second partition plate, and the annular flange is fixedly connected to the inner wall of the rotating drum. The inner sleeve, the annular flange, the rotating drum and the second partition plate enclose an annular cavity connecting each of the discharge ports and the mud supply module. A plurality of support plates are provided, each of which is arranged on the rotating shaft at an annular interval, and the outer end of each support plate is fixed to the connecting inner sleeve and the rotating cylinder.

[0009] In a possible implementation, each of the discharge ports is a long strip port arranged along the length direction of the track, and each of the long strip ports has two parallel long side walls; Among them, one end of the corresponding elastic scraper plate is fixed on one of the long side walls, and the other end extends toward the other long side wall. The elastic scraper plate is used to be deformed by the mud when the mud is squeezed out of the discharge port, and the other end is pushed out of the discharge port by the mud.

[0010] In a possible implementation, the cutting tool set includes a plurality of cutting tools, each of which is arranged in a ring-shaped manner around the axis of the rotating shaft, and each of the cutting tools has one end connected to the protruding end of the rotating shaft and the other end connected to the rotating drum.

[0011] In a possible implementation, the first partition plate and the second partition plate are arranged in parallel and at intervals, and an annular discharge cavity is formed between the first partition plate and the second partition plate; The first partition plate is provided with a material transfer hole for the rotating shaft to pass through and connected with the annular material discharge cavity and the inner sleeve; The second partition plate is fixedly provided with a first fixing ring for rotationally connecting the rotating drum, and is also fixedly provided with a second fixing ring for rotationally connecting the inner sleeve.

[0012] In a possible implementation, the mud supply module includes: A feeding pipeline is arranged along the length direction of the track and is located at the top of the movable jacking pipe. One end of the feeding pipeline passes through the first partition plate and the second partition plate in sequence and is communicated with the annular cavity. The feeding unit is connected to the other end of the feeding pipeline and is used for providing supporting mud.

[0013] In a possible implementation, the slag discharge module includes: A discharge pipeline is located at the bottom of the movable top pipe, one end of which is located in the annular discharge cavity, and the other end of which extends out after passing through the first partition plate; A water inlet pipe, located at the top of the movable jacking pipe and communicated with the annular discharge cavity, wherein the water inlet pipe is connected to a water supply unit for supplying water to the annular discharge cavity; A slurry pump is connected to the other end of the discharge pipeline to extract the slurry in the annular discharge cavity.

[0014] The embodiment of the present invention further provides a pipe jacking construction method for a high groundwater level environment, which is characterized by using the above-mentioned pipe jacking construction device for a high groundwater level environment; and comprising the following steps: Construction preparation: build a cement fixed base at a suitable position at the bottom of the working pit, and connect the track to the fixed base at the same time; Component installation: placing the combination of the mobile jacking pipe, the crushing drill bit and the power structure on the track; then installing and connecting the drive assembly, the mud supply module and the slag discharge module; The supporting mud is prepared by mixing and stirring the raw materials of 20 to 30 parts by weight of bentonite, 50 to 60 parts by weight of water, 5 to 10 parts by weight of polymer, 1 to 10 parts by weight of emulsifier, and 5 to 10 parts by weight of a mixed additive of a tackifier and a dispersant, and providing the raw materials to the mud supply module; During the jacking construction, the driving assembly is started to move the mobile jacking pipe forward; the power structure is started to make the crushing drill bit drive the annular coating part to rotate.

[0015] The pipe jacking construction device for high groundwater level environment provided by this implementation method drives the combination of mobile pipe jacking and crushing drill bit to move on the track through the driving component, and at the same time drives the crushing drill bit to rotate in the power structure, which can ensure the excavation of the soil to be excavated. The slag discharge module can ensure that the soil residue crushed by the crushing drill bit is discharged to avoid the accumulation of soil residue, thereby ensuring the excavation efficiency of the soil. An annular coating part is set on the crushing drill bit, which can be connected to the mud supply module, and can ensure that the supporting mud is evenly coated between the mobile pipe jacking and the soil body in time with the rotation of the crushing drill bit, avoiding the delay of the arrangement of the supporting mud, which can effectively adapt to the high groundwater level environment, and can also improve the construction speed, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a pipe jacking construction device for a high groundwater level environment provided by an embodiment of the present invention; Figure 2 A schematic diagram of the main structure of a pipe jacking construction device for a high groundwater level environment provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a fixed base and a driving assembly of a pipe jacking construction device for a high groundwater level environment provided by an embodiment of the present invention; Figure 4 for Figure 1 A partial cross-sectional structural schematic diagram of a pipe jacking construction device for use in a high groundwater level environment is shown; Figure 5 for Figure 4 The schematic cross-sectional structure diagram of the pipe jacking construction device used in a high groundwater level environment is shown in the AA direction; Figure 6 for Figure 5 The enlarged structural schematic diagram of the pipe jacking construction device at B for use in a high groundwater level environment is shown; Description of reference numerals: 10. Fixed base; 11. Track; 20. Mobile jacking pipe; 21. First partition plate; 22. Second partition plate; 23. Annular discharge cavity; 30. driving assembly; 31. fixing plate; 32. connecting ring; 33. telescopic structure; 40. crushing drill bit; 41. rotating shaft; 42. cutting tool set; 43. rotating drum; 431. discharge port; 432. elastic scraper plate; 433. fixing ring; 44. inner sleeve; 45. annular flange; 46. annular cavity; 47. support plate; 50. Power structure; 60. Mud supply module; 61. Feeding pipeline; 70. Slag discharge module; 71. Discharge pipeline; 72. Water inlet pipe; 73. Slurry pump. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] Please also read Figure 1 and Figure 4 , the jacking pipe construction device for a high groundwater level environment provided by the present invention is now described. The jacking pipe construction device for a high groundwater level environment includes a fixed base 10, a mobile jacking pipe 20, a driving assembly 30, a crushing drill bit 40, a power structure 50, a mud supply module 60 and a slag discharge module 70. The fixed base 10 is arranged at the bottom position of the working well, and a track 11 arranged along the direction to be excavated is provided on the fixed base 10. The mobile jacking pipe 20 is located on the fixed base 10 and can be in sliding contact with the track 11. The driving assembly 30 is fixed on the fixed base 10 and is connected to the tail of the mobile jacking pipe 20 to drive the mobile jacking pipe 20 to move along the length direction of the track 11. The crushing drill bit 40 is coaxially rotatably arranged at the head end of the mobile jacking pipe 20, and the crushing drill bit 40 is connected to the mud supply module 60 and the slag discharge module 70. The crushing drill bit 40 has an annular smearing portion, which can evenly smear the mud delivered by the mud supply module 60 between the mobile jacking pipe 20 and the soil. The power structure 50 is fixed in the mobile jacking pipe 20 and is dynamically connected to the crushing drill bit 40.

[0019] Compared with the prior art, the pipe jacking construction device for a high groundwater level environment provided in this embodiment drives the combination of the mobile pipe jacking 20 and the crushing drill bit 40 to move on the track 11 through the driving assembly 30, and at the same time drives the crushing drill bit 40 to rotate through the power structure 50, so as to ensure the excavation of the soil to be excavated. The slag discharge module 70 can ensure that the soil slag crushed by the crushing drill bit 40 is discharged to avoid the accumulation of soil slag, thereby ensuring the excavation efficiency of the soil. An annular coating part is provided on the crushing drill bit 40, which can be connected to the mud supply module 60, so as to ensure that the supporting mud is evenly coated between the mobile pipe jacking 20 and the soil in time with the rotation of the crushing drill bit 40, so as to avoid the delay of the arrangement of the supporting mud, and can effectively adapt to the high groundwater level environment. In addition, it can also improve the construction speed and has strong practicality.

[0020] In this embodiment, the power structure 50 is mainly used to drive the rotation of the crushing drill bit 40, and can be a diesel engine or a high-power drive motor, etc. The technology of the rotation drive is existing technology and will not be repeated here.

[0021] In some embodiments, the mobile jacking pipe 20 may be used as follows: Figure 1 and Figure 3 See the structure shown. Figure 1 and Figure 3 The movable jacking pipe 20 and the driving assembly 30 are detachably connected.

[0022] The length of the mobile jacking pipe 20 is limited. After moving to a certain distance, the mobile jacking pipe 20 needs to be compensated. At this time, the connection between the mobile jacking pipe 20 and the driving assembly 30 can be disassembled, and a compensation pipe with the same specifications as the mobile jacking pipe 20 is set between the two. The two ends of the compensation pipe are respectively connected to the mobile jacking pipe 20 and the driving assembly 30 to ensure the excavation length, thereby ensuring that the crushing drill bit 40 can move to the receiving well.

[0023] In some embodiments, the drive assembly 30 may be configured as follows: Figure 1 and Figure 3 See the structure shown. Figure 1 and Figure 3 The driving assembly 30 includes a fixed plate 31, a connecting ring 32 and a telescopic structure 33. The fixed plate 31 is fixed on the fixed base 10 and arranged along the vertical direction. The connecting ring 32 is parallel to the fixed plate 31 and arranged at intervals. The connecting ring 32 is connected to the mobile jacking pipe 20. There are multiple telescopic structures 33, each of which is located between the fixed plate 31 and the connecting ring 32, and the two ends of each telescopic structure 33 are respectively connected to the fixed plate 31 and the connecting ring 32.

[0024] The fixed plate 31 can directly contact one of the side walls of the working pit to ensure stability. The connecting pipe is pushed by the telescopic structure 33, and then the mobile top pipe 20 is pushed forward. It has a simple structure, a large thrust, can adapt to the excavation of soil, and has strong practicality.

[0025] The telescopic structure 33 may be a hydraulic cylinder, and each hydraulic cylinder may be arranged in a ring-shaped manner around the axis of the connecting ring 32 .

[0026] In some embodiments, the crushing drill bit 40 may be used as follows: Figure 1 , Figure 2 and Figure 4 See the structure shown. Figure 1 , Figure 2 and Figure 4 The crushing drill bit 40 includes a rotating shaft 41, a rotating drum 43, an inner sleeve 44 and a support plate 47. The rotating shaft 41 is coaxially rotatably arranged on the first partition plate 21 arranged inside the mobile jacking tube 20. The end of the rotating shaft 41 extending out of the mobile jacking tube 20 is connected to the cutting tool group 42. The rotating drum 43 is coaxially rotatably arranged on the second partition plate 22 arranged at the head end of the mobile jacking tube 20. A plurality of discharge ports 431 are annularly arranged on the outer wall surface of the rotating drum 43, and each discharge port 431 is provided with an elastic scraper plate 432 that can be turned outward. Each discharge port 431 and each elastic scraper plate 432 are combined to form an annular smearing portion. The inner sleeve 44 is coaxially rotatably arranged on the second partition plate 22 and is located inside the rotating drum 43. An annular flange 45 is provided at one end of the inner sleeve 44 away from the second partition plate 22, and the annular flange 45 is fixedly connected to the inner wall of the rotating drum 43. The inner sleeve 44, the annular flange 45, the rotating drum 43 and the second partition plate 22 enclose an annular cavity 46 that communicates with each discharge port 431 and the mud supply module 60. A plurality of support plates 47 are provided, each support plate 47 is annularly spaced and arranged on the rotating shaft 41, and the outer end of each support plate 47 is fixedly connected to the inner sleeve 44 and the rotating drum 43.

[0027] The rotating shaft 41 rotates under the drive of the power structure 50, and drives the rotating drum 43, the inner sleeve 44 and the cutting tool group 42 to rotate through the supporting plates 47. The cutting tool group 42 can cut the soil in front, and the soil residue formed by cutting enters the rotating drum 43 and enters between the first partition plate 21 and the second partition plate 22 through the gap between the supporting plates 47. The annular coating part formed by the discharge port 431 and the elastic scraper 432 set on the outer wall of the rotating drum 43 can rotate synchronously with the rotating drum 43. After the mud supply module 60 transfers the mud to the annular cavity 46, the mud will be discharged from the discharge port 431, and the elastic scraper can evenly smear the mud on the inner wall of the soil during the rotation process.

[0028] The annular coating part is arranged on the crushing drill bit 40, so that the supporting mud can be coated on the soil in time, thereby ensuring the timely implementation of the supporting construction, reducing manpower, and ensuring adaptation to the high groundwater level environment.

[0029] In this embodiment, a fixing ring 433 can be provided on the outer wall of one end of the rotating drum 43 away from the movable top pipe 20, and an annular serrated structure is provided at the end of the fixing ring 433, so that the inner diameter of the hole formed by excavation is larger than the outer diameter of the movable top pipe 20, thereby facilitating the laying of the supporting mud and ensuring the laying thickness of the supporting mud to further increase the supporting effect.

[0030] In this embodiment, the extended end of the rotating shaft 41 can be set to be conical, see Figure 4 This structure can prevent the debris with larger particle size from entering between the first partition plate 21 and the second partition plate 22, thereby avoiding blockage.

[0031] In this embodiment, the coaxial mentioned means that the axes of the rotating shaft 41 , the rotating cylinder 43 and the inner sleeve 44 are arranged colinearly with the axis of the movable jacking pipe 20 .

[0032] In some embodiments, the annular application portion may be formed as follows: Figure 5 and Figure 6 See the structure shown. Figure 5 and Figure 6 Each discharge port 431 is a long strip opening arranged along the length direction of the track 11, and each long strip opening has two parallel long side walls.

[0033] Among them, one end of the corresponding elastic scraper plate 432 is fixed on one of the long side walls, and the other end extends toward the other long side wall. The elastic scraper plate 432 can be deformed by the mud when the mud is squeezed out of the discharge port 431, and the other end is pushed out of the discharge port 431 by the mud.

[0034] The elastic scraper plate 432 has good elasticity. When it is not subjected to the thrust of the mud, it is located inside the corresponding long strip opening. This structure can prevent the elastic scraper plate 432 from damaging the supporting mud after smearing during the intermediate shutdown process, and can also prevent external debris from entering the annular cavity 46 during the installation or transfer process. After receiving the thrust of the mud from the annular cavity 46, the elastic scraper plate 432 will bend outward, and the long strip opening will be opened at this time, and the mud will be discharged. As the crushing drill bit 40 rotates, the elastic scraper plate 432 rotates, and then the discharged mud is evenly applied to the soil.

[0035] In this embodiment, the elastic scraper plate 432 can be a fiberboard made of non-metallic material, and one end of the elastic scraper plate 432 can be locked on the rotating drum 43 by screws or bolts.

[0036] In some embodiments, the cutting tool set 42 may be used as follows: Figure 2 See the structure shown. Figure 2 The cutting tool group 42 includes a plurality of cutting tools, each of which is arranged in a ring-shaped manner around the axis of the rotating shaft 41 . One end of each cutting tool is connected to the protruding end of the rotating shaft 41 , and the other end is connected to the rotating drum 43 .

[0037] The two ends of each cutting tool are respectively connected to the rotating shaft 41 and the rotating drum 43, which can ensure the structural strength of each cutting tool and further ensure the rotary drilling effect.

[0038] The cutting tool may have a rotating function. The structure of the cutting tool is prior art and will not be described in detail here.

[0039] In some embodiments, the first partition plate 21 and the second partition plate 22 may be formed as follows: Figure 4 See the structure shown. Figure 4 The first partition plate 21 and the second partition plate 22 are arranged in parallel and at intervals, and an annular discharge cavity 23 is formed between the first partition plate 21 and the second partition plate 22.

[0040] The first partition plate 21 is provided with a material transfer hole for the rotating shaft 41 to pass through and connect the annular discharge cavity 23 and the inner sleeve 44 to ensure that the slag transferred between the support plates 47 enters the annular discharge cavity 23. In addition, a sealed rolling bearing needs to be provided between the first partition plate 21 and the rotating shaft 41.

[0041] The second partition plate 22 is fixed with a first fixing ring 433 for rotationally connecting the rotating drum 43, and is also fixed with a second fixing ring 433 for rotationally connecting the inner sleeve 44. A sealed rolling bearing can be arranged between the first fixing ring 433 and the rotating drum 43, and a sealed rolling bearing can be arranged between the second fixing ring 433 and the inner sleeve 44. In order to further improve the sealing performance, a nylon bearing can also be added.

[0042] In some embodiments, the mud supply module 60 may be implemented as follows: Figure 4 See the structure shown. Figure 4 The mud supply module 60 includes a feed pipe 61 and a feeding unit. The feed pipe 61 is arranged along the length direction of the track 11 and is located at the top of the mobile jacking pipe 20. One end of the feed pipe 61 passes through the first partition plate 21 and the second partition plate 22 in sequence and communicates with the annular cavity 46. The feeding unit is connected to the other end of the feed pipe 61 and can provide supporting mud.

[0043] The feeding pipeline 61 can ensure that the supporting mud is fed into the annular cavity 46, and the feeding pipeline 61 is located at the top of the mobile jacking pipe 20, which can reduce the conveying pressure to a certain extent.

[0044] The feed pipeline may include a mud storage tank and a delivery pump disposed outside. The delivery pump is located in the mud storage tank and is fixedly connected to the other end of the feed pipeline 61 .

[0045] In some embodiments, the slag discharge module 70 may be configured as follows: Figure 4 See the structure shown. Figure 4 The slag discharge module 70 includes a discharge pipeline 71, a water inlet pipe 72 and a slurry pump 73. The discharge pipeline 71 is located at the bottom of the mobile top pipe 20, and one end is located in the annular discharge cavity 23, and the other end extends out after passing through the first partition plate 21. The water inlet pipe 72 is located at the top of the mobile top pipe 20 and is connected to the annular discharge cavity 23. The water inlet pipe 72 is connected to a water supply unit and can supply water to the annular discharge cavity 23. The slurry pump 73 is connected to the other end of the discharge pipeline 71 to extract the slurry in the annular discharge cavity 23.

[0046] The water inlet pipe 72 delivers water into the annular discharge chamber 23, thereby forming the slag at the bottom of the annular discharge chamber 23 into a slurry form, which can be easily pumped out by the slurry pump 73. The discharge end of the slurry pump 73 can be connected to a discharge pipeline to ensure that the mixture of slag and water is discharged to the outside.

[0047] Based on the same inventive concept, an embodiment of the present application also provides a pipe jacking construction method for a high groundwater level environment, characterized in that the above-mentioned pipe jacking construction device for a high groundwater level environment is adopted.

[0048] The pipe jacking construction method for a high groundwater level environment comprises the following steps: S100 Construction preparation: build a fixed base 10 made of cement at a suitable position at the bottom of the working pit, and connect the track 11 to the fixed base 10 at the same time.

[0049] S200 Component installation: the assembly of the mobile jacking pipe 20, the crushing drill bit 40 and the power structure 50 is placed on the track 11. Then the drive assembly 30, the mud supply module 60 and the slag discharge module 70 are installed and connected.

[0050] S300 support mud is made by mixing and stirring raw materials of 20 to 30 parts by weight of bentonite, 50 to 60 parts by weight of water, 5 to 10 parts by weight of polymer, 1 to 10 parts by weight of emulsifier, and 5 to 10 parts by weight of a mixed additive of a thickener and a dispersant, and providing them to the mud supply module 60.

[0051] S400: During the jacking construction, the driving assembly 30 is started to move the mobile jacking pipe 20 forward. The power structure 50 is started to rotate the annular coating part driven by the crushing drill bit 40.

[0052] Compared with the prior art, the pipe jacking construction method for a high groundwater level environment provided in this embodiment can ensure that the supporting mud is evenly applied between the mobile jacking pipe 20 and the soil body in time with the rotation of the crushing drill bit 40, thereby avoiding the delay of the supporting mud arrangement and effectively adapting to the high groundwater level environment. At the same time, a formula for the supporting mud is provided to increase the wall protection performance and further adapt to the high groundwater level environment.

[0053] Specific implementation methods provided regarding the proportion of supporting mud: Embodiment 1: 20 parts of bentonite, 50 parts of water, 5 parts of polymer, 4 parts of emulsifier and 5 parts of mixed additive of viscosity enhancer and dispersant.

[0054] In a high groundwater level environment, the wall protection performance is good, the sand carrying capacity is moderate, and the viscosity and stability meet general requirements.

[0055] Embodiment 2: 25 parts of bentonite, 55 parts of water, 7 parts of polymer, 6 parts of emulsifier and 7 parts of mixed additive of viscosity enhancer and dispersant.

[0056] The wall protection performance is enhanced, the sand carrying capacity is improved, and the viscosity and stability are better.

[0057] Embodiment three: 30 parts of bentonite, 60 parts of water, 10 parts of polymer, 10 parts of emulsifier and 10 parts of mixed additive of viscosity enhancer and dispersant.

[0058] It has excellent wall protection performance, strong sand carrying capacity, high viscosity and stability, and is suitable for complex high groundwater level conditions.

[0059] Therefore, the corresponding ratio can be selected according to different types of high groundwater level environments.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe jacking construction device for a high groundwater level environment, characterized in that: include: A fixed base is arranged at the bottom of the working pit, and a track is arranged on the fixed base along the direction to be excavated; A movable jacking pipe is located on the fixed base and can be in sliding contact with the track; A driving assembly, fixedly mounted on the fixed base and connected to the tail of the mobile jacking pipe, so as to drive the mobile jacking pipe to move along the length direction of the track; A crushing drill bit is coaxially rotatably arranged at the head end of the mobile jacking pipe, and the crushing drill bit is connected to the mud supply module and the slag discharge module; the crushing drill bit has an annular smearing portion, and the annular smearing portion is used to evenly smear the mud delivered by the mud supply module between the mobile jacking pipe and the soil; The power structure is fixedly arranged in the movable jacking pipe and is dynamically connected with the crushing drill bit.

2. The pipe jacking construction device for a high groundwater level environment according to claim 1, characterized in that: The movable jacking pipe is detachably connected to the driving assembly.

3. The pipe jacking construction device for a high groundwater level environment according to claim 1, characterized in that: The drive assembly comprises: A fixed plate, fixed on the fixed base and arranged along the vertical direction; A connecting ring is arranged parallel to and spaced from the fixing plate; the connecting ring is connected to the movable jacking pipe; There are multiple telescopic structures, each of which is located between the fixed plate and the connecting ring, and the two ends of each telescopic structure are respectively connected to the fixed plate and the connecting ring.

4. The pipe jacking construction device for a high groundwater level environment according to claim 1, characterized in that: The crushing drill bit comprises: A rotating shaft is coaxially rotatably arranged on a first partition plate arranged inside the movable jacking pipe; an end of the rotating shaft extending out of the movable jacking pipe is connected to a cutting tool set; A rotating drum is coaxially rotatably arranged on the second partition plate arranged at the head end of the movable top pipe; a plurality of discharge ports are arranged in an annular manner on the outer wall surface of the rotating drum, and each of the discharge ports is provided with an elastic scraper plate that can be turned outward; each of the discharge ports and each of the elastic scraper plates are combined to form an annular coating portion; An inner sleeve is coaxially rotatably arranged on the second partition plate and is located inside the rotating drum. An annular flange is provided at one end of the inner sleeve away from the second partition plate, and the annular flange is fixedly connected to the inner wall of the rotating drum. The inner sleeve, the annular flange, the rotating drum and the second partition plate enclose an annular cavity connecting each of the discharge ports and the mud supply module. A plurality of support plates are provided, each of which is arranged on the rotating shaft at an annular interval, and the outer end of each support plate is fixed to the connecting inner sleeve and the rotating cylinder.

5. The pipe jacking construction device for high groundwater level environment according to claim 4, characterized in that: Each of the discharge ports is a long strip port arranged along the length direction of the track, and each of the long strip ports has two parallel long side walls; Among them, one end of the corresponding elastic scraper plate is fixed on one of the long side walls, and the other end extends toward the other long side wall. The elastic scraper plate is used to be deformed by the mud when the mud is squeezed out of the discharge port, and the other end is pushed out of the discharge port by the mud.

6. The pipe jacking construction device for high groundwater level environment according to claim 4, characterized in that: The cutting tool set comprises a plurality of cutting tools, each of which is arranged in a ring-shaped manner around the axis of the rotating shaft. One end of each cutting tool is connected to the protruding end of the rotating shaft, and the other end is connected to the rotating drum.

7. The pipe jacking construction device for high groundwater level environment according to claim 4, characterized in that: The first partition plate and the second partition plate are arranged in parallel and at intervals, and an annular discharge cavity is formed between the first partition plate and the second partition plate; The first partition plate is provided with a material transfer hole for the rotating shaft to pass through and connected with the annular material discharge cavity and the inner sleeve; The second partition plate is fixedly provided with a first fixing ring for rotationally connecting the rotating drum, and is also fixedly provided with a second fixing ring for rotationally connecting the inner sleeve.

8. The pipe jacking construction device for high groundwater level environment according to claim 7, characterized in that: The mud supply module comprises: A feeding pipeline is arranged along the length direction of the track and is located at the top of the movable jacking pipe. One end of the feeding pipeline passes through the first partition plate and the second partition plate in sequence and is communicated with the annular cavity. A feeding unit is connected to the other end of the feeding pipeline and is used for providing supporting mud.

9. The pipe jacking construction device for a high groundwater level environment according to claim 7, characterized in that: The slag discharge module comprises: A discharge pipeline is located at the bottom of the movable top pipe, one end of which is located in the annular discharge cavity, and the other end of which extends out after passing through the first partition plate; A water inlet pipe, located at the top of the movable jacking pipe and communicated with the annular discharge cavity, wherein the water inlet pipe is connected to a water supply unit for supplying water to the annular discharge cavity; A slurry pump is connected to the other end of the discharge pipeline to extract the slurry in the annular discharge cavity.

10. A pipe jacking construction method for a high groundwater level environment, characterized in that: The pipe jacking construction device for a high groundwater level environment as described in any one of claims 1 to 9 is used; comprising the following steps: Construction preparation: build a cement fixed base at a suitable position at the bottom of the working pit, and connect the track to the fixed base at the same time; Component installation: placing the combination of the mobile jacking pipe, the crushing drill bit and the power structure on the track; then installing and connecting the drive assembly, the mud supply module and the slag discharge module; The supporting mud is prepared by mixing and stirring the raw materials of 20 to 30 parts by weight of bentonite, 50 to 60 parts by weight of water, 5 to 10 parts by weight of polymer, 1 to 10 parts by weight of emulsifier, and 5 to 10 parts by weight of a mixed additive of a tackifier and a dispersant, and providing the raw materials to the mud supply module; During the jacking construction, the driving assembly is started to move the mobile jacking pipe forward; the power structure is started to make the crushing drill bit drive the annular coating part to rotate.

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