Pipe jacking construction equipment and methods for high groundwater levels

Abstract

This invention provides a pipe jacking construction device and method for high groundwater environments. The pipe jacking construction device for high groundwater environments includes a fixed base, a movable pipe, a drive assembly, a pulverizing drill bit, and a power structure. A track is provided on the fixed base. The movable pipe can slide in contact with the track. The drive assembly drives the movable pipe to move along the length of the track. The pulverizing drill bit is coaxially rotatably mounted at the head end of the movable pipe, and is connected to a mud supply module and a slag removal module. The pulverizing drill bit has an annular coating section that can evenly coat the mud supplied by the mud supply module between the movable pipe and the soil. The power structure is fixed in the movable pipe and dynamically connected to the pulverizing drill bit. The pipe jacking construction device for high groundwater environments provided by this invention can ensure that the supporting mud is evenly coated between the movable pipe and the soil in a timely manner as the pulverizing drill bit rotates, making it adaptable to high groundwater environments and highly practical.

Description

Technical Field

[0001] This invention belongs to the field of pipe jacking construction technology, specifically relating to a pipe jacking construction device and method for environments with high groundwater levels. Background Technology

[0002] Pipe jacking is an underground construction method mainly used for laying underground facilities such as pipelines and tunnels. This method involves setting up a working shaft on the ground and then using specialized equipment to push the pipeline or tunnel underground. It typically does not require large-scale excavation of the surface, reducing 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 within the working pit, pushing the pipeline into the ground at the designed slope and direction, and then removing the excavated soil. After one section of pipe is pushed into the ground, the second section is installed and the jacking continues.

[0003] In existing technologies, when constructing pipe jacking systems in environments with high groundwater levels, the excavated soil is continuously expelled as the pipe jacking machine advances. After the machine passes, slurry is then injected as support between the outer wall and the soil. However, in environments with high groundwater levels, the instability of the strata and the obstruction of soil excavation due to groundwater influence significantly increase the difficulty of construction. The aforementioned method of injecting slurry between the pipe and the soil cannot guarantee synchronous and rapid slurry application, thus hindering timely support. Furthermore, the manual injection of the support slurry further reduces construction speed and makes the system unsuitable for high groundwater environments, exhibiting poor adaptability. Summary of the Invention

[0004] This invention provides a pipe jacking construction device and method for high groundwater level environments, aiming to solve the problem of poor adaptability of existing pipe jacking construction devices due to their inability to adapt to high groundwater level environments.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a pipe jacking construction device for environments with high groundwater levels, comprising:

[0006] A fixed base is set at the bottom of the working well, and the fixed base is provided with a track set along the direction to be excavated;

[0007] The movable jacking pipe is located on the fixed base and can slide in contact with the track;

[0008] A drive assembly is fixed on the fixed base and connected to the tail of the moving jacking pipe to drive the moving jacking pipe to move along the length of the track.

[0009] A pulverizing drill bit is coaxially rotatably mounted at the head end of the moving jacking pipe. The pulverizing drill bit is connected to a mud supply module and a slag removal module. The pulverizing drill bit has an annular coating part, which is used to evenly coat the mud supplied by the mud supply module between the moving jacking pipe and the soil.

[0010] The power structure is fixed in the movable jacking pipe and is dynamically connected to the crushing drill bit.

[0011] In one possible implementation, the movable jacking pipe is detachably connected to the drive assembly.

[0012] In one possible implementation, the driving component includes:

[0013] A fixing plate is fixed on the fixing base and is arranged in the vertical direction;

[0014] A connecting ring is provided parallel to and spaced apart from the fixed plate; the connecting ring is connected to the movable jacking pipe.

[0015] The telescopic structure is provided in multiple parts, each of which is located between the fixed plate and the connecting ring, and each of the telescopic structures is connected to the fixed plate and the connecting ring at both ends.

[0016] In one possible implementation, the crushing drill bit includes:

[0017] A rotating shaft is coaxially rotatably mounted on a first partition plate inside the movable jacking pipe; a cutting tool assembly is connected to the end of the rotating shaft extending out of the movable jacking pipe.

[0018] A rotating drum is coaxially rotatably mounted on a second partition plate at the head end of the movable top pipe; a plurality of discharge ports are arranged in a ring on the outer wall of the rotating drum, and each discharge port is provided with an elastic scraper that can be flipped outward; the discharge ports and the elastic scrapers are combined to form an annular coating section;

[0019] An inner sleeve is coaxially rotatably mounted on the second partition plate and located inside the rotating cylinder. The end of the inner sleeve away from the second partition plate is provided with an annular flange, which is fixedly connected to the inner wall of the rotating cylinder. The inner sleeve, the annular flange, the rotating cylinder, and the second partition plate together form an annular cavity that connects each of the discharge ports and the mud supply module.

[0020] Multiple support plates are provided, and each support plate is arranged in a ring at intervals on the rotating shaft. The outer end of each support plate is fixed to the connecting inner sleeve and the rotating cylinder.

[0021] In one possible implementation, each of the discharge ports is an elongated opening arranged along the length of the track, and each elongated opening has two parallel long sidewalls.

[0022] The elastic scraper is fixed at one end to one of the long sidewalls and extends toward the other long sidewall. The elastic scraper is deformed by the mud during the process of the mud being squeezed out of the discharge port, and the other end is pushed out of the discharge port by the mud.

[0023] In one possible implementation, the cutting tool assembly includes a plurality of cutting tools, each of which is arranged circumferentially around the axis of the rotating shaft. One end of each cutting tool is connected to the extended end of the rotating shaft, and the other end is connected to the rotating drum.

[0024] In one possible implementation, the first partition plate and the second partition plate are arranged in parallel and spaced apart, and an annular discharge cavity is formed between the first partition plate and the second partition plate;

[0025] The first partition plate is provided with a material transfer hole through which the rotating shaft passes and which connects the annular discharge chamber and the inner sleeve;

[0026] The second partition plate is fixed with a first fixing ring for the rotating drum to rotate and a second fixing ring for the inner sleeve to rotate.

[0027] In one possible implementation, the mud supply module includes:

[0028] The feeding pipeline is arranged along the length of the track and is located at the top of the moving top pipe. One end of the feeding pipeline passes through the first partition plate and the second partition plate in sequence and then communicates with the annular cavity.

[0029] The feeding unit, connected to the other end of the feeding pipeline, is used to provide support mud.

[0030] In one possible implementation, the slag removal module includes:

[0031] The discharge pipe is located at the bottom of the movable top pipe, with one end located in the annular discharge cavity and the other end extending out after passing through the first partition plate;

[0032] A water inlet pipe is located at the top of the movable top pipe and communicates with the annular discharge chamber. The water inlet pipe is connected to a water supply unit for supplying water to the annular discharge chamber.

[0033] A slurry pump is connected to the other end of the discharge pipeline to extract slurry from the annular discharge chamber.

[0034] This invention also provides a pipe jacking construction method for environments with high groundwater levels, characterized by employing the aforementioned pipe jacking construction device for environments with high groundwater levels; including the following steps:

[0035] Construction preparation: Construct a fixed cement base at a suitable location at the bottom of the working well, and connect the track to the fixed base at the same time.

[0036] The components are installed by placing the combination of the mobile jacking pipe, the crushing drill bit, and the power structure on the track; then the drive assembly, the mud supply module, and the slag removal module are installed and connected.

[0037] The support mud is made by mixing and stirring the raw materials, which are 20-30 parts by weight of bentonite, 50-60 parts by weight of water, 5-10 parts by weight of polymer, 1-10 parts by weight of emulsifier and 5-10 parts by weight of mixed additives of thickener and dispersant, and then supplying them to the mud supply module.

[0038] During jacking construction, the drive assembly is activated to move the jacking pipe forward; the power structure is activated to make the crushing drill bit drive the annular coating part to rotate.

[0039] This implementation provides a pipe jacking construction device for high groundwater environments. A drive assembly moves the combination of the mobile pipe jacking and the crushing drill bit along a track, while a power structure rotates the crushing drill bit, ensuring efficient excavation of the soil. A muck removal module discharges the crushed soil from the crushing drill bit, preventing accumulation and improving excavation efficiency. An annular coating section on the crushing drill bit connects to a mud supply module, ensuring timely and even application of support mud between the mobile pipe jacking and the soil as the drill bit rotates. This prevents delays in mud placement, effectively adapts to high groundwater environments, increases construction speed, and is highly practical. Attached Figure Description

[0040] Figure 1 A schematic diagram of the structure of a pipe jacking construction device for high groundwater level environments provided in an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the main structure of a pipe jacking construction device for high groundwater environments provided in an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the fixed base and drive component structure of the pipe jacking construction device for high groundwater level environments provided in an embodiment of the present invention;

[0043] Figure 4 for Figure 1A partial cross-sectional view of a pipe jacking construction device for use in environments with high groundwater levels is shown.

[0044] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the pipe jacking construction device used in high groundwater environments.

[0045] Figure 6 for Figure 5 The diagram shows an enlarged structural schematic of section B of the pipe jacking construction device used in high groundwater environments.

[0046] Explanation of reference numerals in the attached figures:

[0047] 10. Fixed base; 11. Track;

[0048] 20. Moving jacking pipe; 21. First partition plate; 22. Second partition plate; 23. Annular discharge chamber;

[0049] 30. Drive assembly; 31. Fixing plate; 32. Connecting ring; 33. Telescopic structure;

[0050] 40. Crushing drill bit; 41. Shaft; 42. Cutting tool assembly; 43. Rotary drum; 431. Discharge port; 432. Elastic scraper; 433. Fixing ring; 44. Inner sleeve; 45. Annular flange; 46. Annular cavity; 47. Support plate;

[0051] 50. Dynamic structure;

[0052] 60. Slurry supply module; 61. Feeding pipeline;

[0053] 70. Slag discharge module; 71. Discharge pipeline; 72. Water inlet pipe; 73. Slurry pump. Detailed Implementation

[0054] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0055] Please refer to the following: Figure 1 and Figure 4The present invention provides a pipe jacking construction device for high groundwater level environments. The device includes a fixed base 10, a movable pipe 20, a drive assembly 30, a crushing drill bit 40, a power structure 50, a mud supply module 60, and a slag removal module 70. The fixed base 10 is located at the bottom of the working shaft and has a track 11 arranged along the direction of excavation. The movable pipe 20 is located on the fixed base 10 and can slide in contact with the track 11. The drive assembly 30 is fixed to the fixed base 10 and connected to the tail of the movable pipe 20 to drive the movable pipe 20 to move along the length of the track 11. The crushing drill bit 40 is coaxially rotatably disposed at the head end of the movable pipe 20 and is connected to the mud supply module 60 and the slag removal module 70. The pulverizing drill bit 40 has an annular coating section, which can evenly coat the mud supplied by the mud supply module 60 between the moving jacking pipe 20 and the soil. The power structure 50 is fixed in the moving jacking pipe 20 and is movably connected to the pulverizing drill bit 40.

[0056] The pipe jacking construction device for high groundwater environments provided in this embodiment, compared with the prior art, uses a drive component 30 to move the combination of the mobile pipe jacking 20 and the crushing drill bit 40 on the track 11, while the power structure 50 drives the crushing drill bit 40 to rotate, ensuring the excavation of the soil to be excavated. The muck removal module 70 ensures the discharge of the soil crushed by the crushing drill bit 40, preventing soil accumulation and thus ensuring excavation efficiency. An annular coating section is provided on the crushing drill bit 40, which can be connected to the mud supply module 60. This ensures that as the crushing drill bit 40 rotates, the supporting mud is evenly applied between the mobile pipe jacking 20 and the soil, avoiding delays in mud placement. This device effectively adapts to high groundwater environments and also improves construction speed, making it highly practical.

[0057] In this embodiment, the power structure 50 is mainly used to drive the rotation of the crushing drill bit 40. It can be a diesel engine or a high-power drive motor, etc. The technology of this rotation drive is existing technology and will not be described in detail here.

[0058] In some embodiments, the aforementioned movable jacking pipe 20 may employ, as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 The movable jacking pipe 20 and the drive assembly 30 are detachably connected.

[0059] Since the length of the mobile jacking pipe 20 is limited, after moving to a certain distance, it is necessary to perform superimposed compensation on the mobile jacking pipe 20. At this time, the connection between the mobile jacking pipe 20 and the drive component 30 can be disassembled, and a compensation pipe of the same specification as the mobile jacking pipe 20 can be set between the two. The two ends of the compensation pipe are connected to the mobile jacking pipe 20 and the drive component 30 respectively to ensure the excavation length, thereby ensuring that the crushing drill bit 40 can move to the receiving well.

[0060] In some embodiments, the driving component 30 described above may employ, for example... Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 The drive 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 is arranged vertically. The connecting ring 32 is parallel to the fixed plate 31 and spaced apart. The connecting ring 32 is connected to the movable jacking pipe 20. Multiple telescopic structures 33 are provided, each telescopic structure 33 is located between the fixed plate 31 and the connecting ring 32, and each telescopic structure 33 is connected to the fixed plate 31 and the connecting ring 32 at both ends.

[0061] The fixed plate 31 can directly contact one of the side walls of the working well to ensure stability. The connecting pipe is pushed by the telescopic structure 33, which in turn pushes the moving jacking pipe 20 forward. It has a simple structure, large thrust, can adapt to soil excavation, and is highly practical.

[0062] The telescopic structure 33 can be a hydraulic cylinder, and each hydraulic cylinder can be arranged at intervals around the axis of the connecting ring 32.

[0063] In some embodiments, the aforementioned shredder bit 40 may employ, for example... Figure 1 , Figure 2 and Figure 4 The structure shown. See also Figure 1 , Figure 2 and Figure 4The crushing drill bit 40 includes a rotating shaft 41, a rotating cylinder 43, an inner sleeve 44, and a support plate 47. The rotating shaft 41 is coaxially rotatably mounted on a first partition plate 21 inside the movable jacking pipe 20. A cutting tool assembly 42 is connected to the end of the rotating shaft 41 extending out of the movable jacking pipe 20. The rotating cylinder 43 is coaxially rotatably mounted on a second partition plate 22 at the head end of the movable jacking pipe 20. Multiple discharge ports 431 are annularly arranged on the outer wall of the rotating cylinder 43, and each discharge port 431 is provided with an outwardly flipping elastic scraper 432. The discharge ports 431 and each elastic scraper 432 combine to form an annular coating section. The inner sleeve 44 is coaxially rotatably mounted on the second partition plate 22 and located inside the rotating cylinder 43. An annular flange 45 is provided at the 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 cylinder 43. The inner sleeve 44, the annular flange 45, the rotating cylinder 43, and the second partition plate 22 enclose and form an annular cavity 46 that connects each discharge port 431 and the mud supply module 60. Multiple support plates 47 are provided, and each support plate 47 is arranged annularly at intervals 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 cylinder 43.

[0064] Driven by the power structure 50, the rotating shaft 41 rotates, simultaneously driving the rotating drum 43, inner sleeve 44, and cutting blade assembly 42 to rotate via the support plates 47. The cutting blade assembly 42 can cut the soil in front, and the resulting soil debris enters the rotating drum 43 and passes through the gaps between the support plates 47 into the space between the first partition plate 21 and the second partition plate 22. The annular coating part formed by the discharge port 431 and the elastic scraper 432 on the outer wall of the rotating drum 43 can rotate synchronously with the rotating drum 43. After the mud supply module 60 delivers mud to the annular cavity 46, the mud will be discharged through the discharge port 431, and the elastic scraper can evenly coat the mud on the inner wall of the soil during the rotation process.

[0065] By placing the annular coating section on the pulverizing drill bit 40, the supporting mud can be applied to the soil in a timely manner, thereby ensuring timely support construction, reducing manpower, and ensuring adaptability to high groundwater environments.

[0066] In this embodiment, a fixing ring 433 can be provided on the outer wall of the end of the rotating drum 43 away from the moving jacking pipe 20. At the same time, an annular sawtooth 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 moving jacking pipe 20, thereby facilitating the laying of the support mud and ensuring the thickness of the support mud to further increase the support effect.

[0067] In this embodiment, the protruding end of the rotating shaft 41 can be set to a tapered shape, as shown in the reference. Figure 4 This structure can prevent larger particles of slag from entering between the first partition plate 21 and the second partition plate 22, thereby avoiding blockage.

[0068] In this embodiment, the coaxiality mentioned refers to the fact that the axes of the rotating shaft 41, the rotating cylinder 43, and the inner sleeve 44 are arranged in the same line as the axis of the moving jacking pipe 20.

[0069] In some embodiments, the aforementioned annular coating portion may be adopted as follows: Figure 5 and Figure 6 The structure shown. See also Figure 5 and Figure 6 Each discharge port 431 is a long strip opening arranged along the length of the track 11, and each long strip opening has two parallel long sidewalls.

[0070] One end of the corresponding elastic scraper 432 is fixed on one of the long side walls, and the other end extends toward the other long side wall. The elastic scraper 432 can be deformed by the slurry during the process of the slurry being squeezed out of the discharge port 431, and the other end is pushed out of the discharge port 431 by the slurry.

[0071] The elastic scraper 432 has good elasticity. When not subjected to the thrust of the mud, it is located inside the corresponding elongated opening. This structure can prevent the elastic scraper 432 from damaging the applied supporting mud during intermediate shutdowns, and can also prevent external debris from entering the annular cavity 46 during installation or relocation. When subjected to the squeezing force of the mud from inside the annular cavity 46, the elastic scraper 432 will bend outward, at which point the elongated opening will open, and the mud will be discharged. As the crushing drill bit 40 rotates, the elastic scraper 432 rotates as well, thereby evenly spreading the discharged mud onto the soil.

[0072] In this embodiment, the elastic scraper 432 can be a non-metallic fiberboard, and one end can be locked to the rotating drum 43 by screws or bolts.

[0073] In some embodiments, the cutting tool assembly 42 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The cutting tool assembly 42 includes multiple cutting tools, each of which is arranged in a ring around the axis of the rotating shaft 41. One end of each cutting tool is connected to the extended end of the rotating shaft 41, and the other end is connected to the rotating cylinder 43.

[0074] Each cutting tool is connected to a rotating shaft 41 and a rotating cylinder 43 at both ends, which can ensure the structural strength of each cutting tool and thus ensure the rotary drilling effect.

[0075] Cutting tools can have a rotating function. The structure of cutting tools is existing technology and will not be described in detail here.

[0076] In some embodiments, the first partition plate 21 and the second partition plate 22 may be adopted as follows: Figure 4The structure shown. See also Figure 4 The first partition plate 21 and the second partition plate 22 are arranged in parallel and spaced apart, and an annular discharge cavity 23 is formed between the first partition plate 21 and the second partition plate 22.

[0077] The first partition plate 21 is provided with a material transfer hole through which the rotating shaft 41 passes and connects the annular discharge chamber 23 and the inner sleeve 44, so as to ensure that the slag transferred between each support plate 47 enters the annular discharge chamber 23. In addition, a sealed rolling bearing needs to be installed between the first partition plate 21 and the rotating shaft 41.

[0078] The second partition plate 22 is fixed with a first fixing ring 433 for rotating connection of the rotating drum 43, and a second fixing ring 433 for rotating connection of the inner sleeve 44. A sealed rolling bearing can be provided between the first fixing ring 433 and the rotating drum 43, and a sealed rolling bearing can be provided between the second fixing ring 433 and the inner sleeve 44. In order to further increase the sealing performance, a nylon bearing can also be added.

[0079] In some embodiments, the mud supply module 60 described above may employ, for example... Figure 4 The structure shown. See also Figure 4 The mud supply module 60 includes a feeding pipe 61 and a feeding unit. The feeding pipe 61 is arranged along the length of the track 11 and is located at the top of the moving jacking pipe 20. One end of the feeding pipe 61 passes through the first partition plate 21 and the second partition plate 22 in sequence and then communicates with the annular cavity 46. The feeding unit is connected to the other end of the feeding pipe 61 and can provide supporting mud.

[0080] The feeding pipe 61 ensures that the supporting slurry is delivered into the annular cavity 46, and the feeding pipe 61 is located at the top of the moving jacking pipe 20, which can reduce the conveying pressure to a certain extent.

[0081] The feeding pipeline may include an external mud storage tank and a conveying pump, with the conveying pump located in the mud storage tank and fixedly connected to the other end of the feeding pipeline 61.

[0082] In some embodiments, the slag discharge module 70 may employ, as follows: Figure 4 The structure shown. See also Figure 4 The slag removal module 70 includes a discharge pipe 71, a water inlet pipe 72, and a slurry pump 73. The discharge pipe 71 is located at the bottom of the movable jacking pipe 20, with one end in the annular discharge chamber 23 and the other end extending out after passing through the first partition plate 21. The water inlet pipe 72 is located at the top of the movable jacking pipe 20 and communicates with the annular discharge chamber 23. The water inlet pipe 72 is connected to a water supply unit, enabling it to supply water to the annular discharge chamber 23. The slurry pump 73 is connected to the other end of the discharge pipe 71 to extract slurry from the annular discharge chamber 23.

[0083] Water is introduced into the annular discharge chamber 23 through the inlet pipe 72, causing the slag at the bottom of the annular discharge chamber 23 to form a slurry, which can be easily extracted 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.

[0084] Based on the same inventive concept, this application also provides a pipe jacking construction method for high groundwater level environments, characterized in that the above-mentioned pipe jacking construction device for high groundwater level environments is used.

[0085] The pipe jacking construction method for high groundwater level environments includes the following steps:

[0086] S100 construction preparation: Construct a cement base 10 at a suitable position at the bottom of the working well, and connect the track 11 to the base 10 at the same time.

[0087] S200 component installation involves placing the assembly of the mobile jacking pipe 20, the crushing drill bit 40, and the power structure 50 onto the track 11. Subsequently, the drive assembly 30, the mud supply module 60, and the slag removal module 70 are installed and connected.

[0088] The S300 support is made of mud by mixing and stirring the raw materials, which are 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 mixed additives of thickener and dispersant, and then supplying them to the mud supply module 60.

[0089] During S400 jacking construction, the drive assembly 30 is activated to advance the moving jacking pipe 20. The power structure 50 is activated to rotate the annular coating section driven by the pulverizing drill bit 40.

[0090] The pipe jacking construction method for high groundwater level environments provided in this embodiment, compared with the prior art, ensures that the supporting mud is evenly applied between the moving pipe jacking 20 and the soil as the pulverizing drill bit 40 rotates, avoiding delays in the placement of the supporting mud and effectively adapting to high groundwater level environments. It also provides a formula for the supporting mud, increasing its wall-protecting performance and further enhancing its adaptability to high groundwater level environments.

[0091] Specific implementation methods regarding the mixing ratio of the support slurry are provided below:

[0092] Example 1:

[0093] 20 parts bentonite, 50 parts water, 5 parts polymer, 4 parts emulsifier, and 5 parts mixed additive of thickener and dispersant.

[0094] In environments with high groundwater levels, it exhibits good wall protection performance, moderate sand carrying capacity, and viscosity and stability that meet general requirements.

[0095] Example 2:

[0096] 25 parts bentonite, 55 parts water, 7 parts polymer, 6 parts emulsifier, and 7 parts mixed additive of thickener and dispersant.

[0097] The wall-protecting performance is enhanced, the sand-carrying capacity is improved, and the viscosity and stability are good.

[0098] Example 3:

[0099] 30 parts bentonite, 60 parts water, 10 parts polymer, 10 parts emulsifier, and 10 parts mixed additive of thickener and dispersant.

[0100] It has excellent wall protection performance, strong sand carrying capacity, high viscosity and stability, and is suitable for complex high groundwater level conditions.

[0101] Therefore, the appropriate ratio can be selected according to different types of high groundwater level environments.

[0102] 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 within the protection scope of the present invention.

Claims

1. A pipe jacking construction device for environments with high groundwater levels, characterized in that, include: A fixed base is set at the bottom of the working well, and the fixed base is provided with a track set along the direction to be excavated; The movable jacking pipe is located on the fixed base and can slide in contact with the track; A drive assembly is fixed on the fixed base and connected to the tail of the moving jacking pipe to drive the moving jacking pipe to move along the length of the track. A pulverizing drill bit is coaxially rotatably mounted at the head end of the moving jacking pipe. The pulverizing drill bit is connected to a mud supply module and a slag removal module. The pulverizing drill bit has an annular coating part, which is used to evenly coat the mud supplied by the mud supply module between the moving jacking pipe and the soil. The power structure is fixedly installed in the movable jacking pipe and is dynamically connected to the crushing drill bit; The pulverizing drill bit includes a rotating shaft, a rotating cylinder, an inner sleeve, and a support plate. The rotating shaft is coaxially rotatably mounted on a first partition plate inside the movable jacking pipe. A cutting blade assembly is connected to the end of the rotating shaft extending out of the movable jacking pipe. The rotating cylinder is coaxially rotatably mounted on a second partition plate at the head end of the movable jacking pipe. Multiple discharge ports are arranged annularly on the outer wall of the rotating cylinder, and each discharge port is provided with an outwardly rotatable elastic scraper. The discharge ports and elastic scrapers combine to form an annular coating section. The inner sleeve is coaxially rotatably mounted on the second partition plate and located inside the rotating cylinder. An annular flange is provided at the 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 cylinder. The inner sleeve, the annular flange, the rotating cylinder, and the second partition plate enclose to form an annular cavity connecting each discharge port and the mud supply module. Multiple support plates are provided, and each support plate is annularly spaced on the rotating shaft, and the outer end of each support plate is fixed to the connecting inner sleeve and the rotating cylinder. Each of the discharge ports is an elongated opening arranged along the length of the track, and each elongated opening has two parallel long sidewalls; one end of the corresponding elastic scraper is fixed on one of the long sidewalls, and the other end extends toward the other long sidewall. The elastic scraper is used to be deformed by the mud during the process of the mud being squeezed out of the discharge port, and the other end is pushed out of the discharge port by the mud.

2. The pipe jacking construction device for high groundwater level environments as described in claim 1, characterized in that, The movable jacking pipe is detachably connected to the drive assembly.

3. The pipe jacking construction device for high groundwater level environments as described in claim 1, characterized in that, The driving component includes: A fixing plate is fixed on the fixing base and is arranged in the vertical direction; A connecting ring is provided parallel to and spaced apart from the fixed plate; the connecting ring is connected to the movable jacking pipe. The telescopic structure is provided in multiple parts, each of which is located between the fixed plate and the connecting ring, and each of the telescopic structures is connected to the fixed plate and the connecting ring at both ends.

4. The pipe jacking construction device for high groundwater level environments as described in claim 1, characterized in that, The cutting tool assembly includes multiple cutting tools, each of which is arranged circumferentially around the axis of the rotating shaft. One end of each cutting tool is connected to the extended end of the rotating shaft, and the other end is connected to the rotating cylinder.

5. The pipe jacking construction device for high groundwater level environments as described in claim 1, characterized in that, The first partition plate and the second partition plate are arranged parallel to each other and spaced apart, 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 through which the rotating shaft passes and which connects the annular discharge chamber and the inner sleeve; The second partition plate is fixed with a first fixing ring for the rotating drum to rotate and a second fixing ring for the inner sleeve to rotate.

6. The pipe jacking construction device for high groundwater level environments as described in claim 5, characterized in that, The mud supply module includes: The feeding pipeline is arranged along the length of the track and is located at the top of the moving top pipe. One end of the feeding pipeline passes through the first partition plate and the second partition plate in sequence and then communicates with the annular cavity. The feeding unit, connected to the other end of the feeding pipeline, is used to provide support mud.

7. The pipe jacking construction device for high groundwater level environments as described in claim 5, characterized in that, The slag discharge module includes: The discharge pipe is located at the bottom of the movable top pipe, with one end located in the annular discharge cavity and the other end extending out after passing through the first partition plate; A water inlet pipe is located at the top of the movable top pipe and communicates with the annular discharge chamber. The water inlet pipe is connected to a water supply unit for supplying water to the annular discharge chamber. A slurry pump is connected to the other end of the discharge pipeline to extract slurry from the annular discharge chamber.

8. A pipe jacking construction method for environments with high groundwater levels, characterized in that, The pipe jacking construction apparatus for high groundwater level environments as described in any one of claims 1-7 includes the following steps: Construction preparation: Construct a fixed cement base at a suitable location at the bottom of the working well, and connect the track to the fixed base at the same time. The components are installed by placing the combination of the mobile jacking pipe, the crushing drill bit, and the power structure on the track; then the drive assembly, the mud supply module, and the slag removal module are installed and connected. The support mud is made by mixing and stirring the raw materials, which are 20-30 parts by weight of bentonite, 50-60 parts by weight of water, 5-10 parts by weight of polymer, 1-10 parts by weight of emulsifier and 5-10 parts by weight of mixed additives of thickener and dispersant, and then supplying them to the mud supply module. During jacking construction, the drive assembly is activated to move the jacking pipe forward; the power structure is activated to make the crushing drill bit drive the annular coating part to rotate.

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