Method and device for dewatering construction of long-distance large-diameter pipeline groove

Abstract

The invention relates to the technical field of foundation pit excavation and drainage, in particular to a long-distance large-diameter pipeline groove dewatering construction method and device.The long-distance large-diameter pipeline groove dewatering construction device comprises a PVC pipe body, a pipe joint assembly and a geotechnical filter screen, drill holes are formed in the PVC pipe body at the interval of 20 cm in the length direction, the drill holes are distributed at intervals in the circumferential direction, anti-blocking heads are plugged in the drill holes, and the geotechnical filter screen is arranged in the pipe joint assembly; the pipe joint assembly is used for connecting adjacent PVC pipe bodies and comprises a front butt-joint ring, a rear butt-joint ring, a hinged base, a winding ring and a micro-deviation adjusting mechanism, the front butt-joint ring and the rear butt-joint ring are both hinged to the hinged base, the hinged base is provided with an insertion nail body, and the winding ring is arranged on the insertion nail body. The opposite ring faces between the front butt joint ring and the rear butt joint ring are connected with butt joint corrugated pipes. The pipe body and the geotechnical filter screen can be directly and rapidly spliced and assembled on site, and the butt joint angle can be obliquely set through the adjusting device in the splicing process, so that seepage water can be pumped and drained at a certain inclination angle on the whole, and rapid drainage is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit excavation drainage, and in particular to a long-distance large-diameter pipeline trench dewatering construction method and device. Background Art

[0002] When the foundation pit of the water pipeline passes through areas such as reservoirs and small ponds, the high groundwater level around the construction area will cause water seepage after the foundation pit is excavated. During the open excavation construction process, the foundation pit is often flooded due to the influence of rainfall factors. After the excavation, the concrete base pouring, pipeline installation, pipeline joint treatment, anti-corrosion, cathodic protection and other construction will cause the foundation pit to be exposed for a long time. Water seepage and water accumulation in the foundation pit will have a serious impact on the excavated foundation surface. After the foundation surface is soaked in water, the bearing capacity of the foundation is difficult to meet the design requirements. It is often necessary to carry out replacement and other procedures. In addition, the foundation surface is not in a dry state and the next step of construction cannot be carried out. Rash construction will disturb the foundation surface and cause insufficient bearing capacity. The water accumulation state will cause great trouble to the operations in the foundation pit and seriously delay the construction period. The conventional method is to use open ditch drainage, which will cause the working surface of the foundation pit to become narrower and change the original shape of the foundation pit, which is not conducive to the subsequent pipeline installation and trench backfilling work. In addition, rash backfilling in the seepage state is likely to cause hidden dangers such as voids at the bottom of the pipe, and the quality cannot be guaranteed. During the construction process, the continuous seepage of the slope will affect the stability of the slope of the deep foundation pit, creating safety hazards such as collapse and landslide.

[0003] Therefore, according to the project's safety and quality requirements for pipeline construction, a long-distance, large-diameter pipeline trench dewatering construction method and device are urgently needed to solve the problem of drainage of seepage water in trench dewatering in long-distance, large-pipeline foundation pit excavation in low-lying areas close to reservoirs and ponds. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a long-distance and large-diameter pipeline trench dewatering construction method and device in view of the shortcomings of the existing technology, so as to minimize the seepage and accumulation of water in the foundation pit, reduce the impact on pipeline installation, trench backfilling and slope stability, and at the same time ensure the safety of the foundation pit and the dryness of the foundation surface during the construction process, and ensure that the bearing capacity of the foundation meets the requirements.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solution. The present invention discloses a long-distance large-diameter pipeline trench dewatering construction method and device, comprising the following steps:

[0006] Step S1, according to the geological conditions, use manual labor and / or small machinery to excavate 30cm wide and 50cm deep trenches on both sides of the bottom of the foundation pit, and the slope setting is consistent with the slope of the foundation surface to provide space for installing pipelines; Step S2, select DN150mmPVC pipe body, and drill holes on the pipe at a spacing of 20cm. After drilling, plug the holes with anti-clogging heads to prevent clogging by soil after landfill; Step S3, use a geotextile filter to wrap the PVC pipe body in step S2, and connect the adjacent wrapped pipes with a pipe joint assembly and place them in the excavated groove In the step S4, a gravel layer with a thickness of 20 to 40 mm is laid on the pipe section installed in step S3 and leveled until the overall landfill construction of the designated pipe section is completed; in step S5, a 2×2×2m water collection well is excavated at the end of the foundation pit of the buried pipe section in step S4 to collect muddy water collected by the buried pipe body in the blind ditch on both sides of the foundation pit; in step S6, the water collection well is pumped and discharged to the three-level sedimentation tank system outside the foundation pit for sedimentation, and then flows into the surrounding river system, completing the ditch precipitation collection and drainage process.

[0007] Further, step S3 includes first inserting one end of the PVC pipe body into the ring of the pipe joint assembly and then locking the front corner of the geofilter to the ring through a knitting needle and winding it, and then inserting the other end of the PVC pipe body into the ring and then locking the rear corner of the geofilter to the ring through a knitting needle and winding it, until the geofilter is completely wound and the two ends are fixed with knitting needles.

[0008] Further, step S3 includes setting the inclined docking angle through the micro-adjustment mechanism of the pipe joint assembly after the pipe joint assembly is docked and placed in the excavated groove, so that the pipe section can seep and divert water at a certain overall inclination in the entire seepage section.

[0009] Furthermore, the step S4 includes first laying gravel having a diameter close to that of the borehole in the pipe body when laying the gravel layer on the installed pipe section.

[0010] The present invention also discloses a long-distance large-diameter pipeline trench dewatering construction device, comprising a PVC pipe body, a pipe joint assembly and a geotextile filter, wherein the PVC pipe body is provided with holes at intervals of 20 cm along the length direction, the holes are arranged at intervals along the circumferential direction, and the boreholes are plugged with anti-clogging heads, and the pipe joint assembly is used to connect adjacent PVC pipe bodies, and the pipe joint assembly comprises a front docking ring, a rear docking ring, a hinged base, a ring around and a micro-deflection adjustment mechanism, wherein the front docking ring and the rear docking ring are both hinged on the hinged base, and the hinged base A nail body is provided, and a docking bellows is connected to the relative annular surface between the front docking ring and the rear docking ring. The outer end surfaces of the front docking ring and the rear docking ring are rotatably connected with a winding ring, and the edge of the winding ring is provided with a threading hole for sewing the geotextile filter. The micro-bias adjustment mechanism is connected between the front docking ring and the rear docking ring. The PVC pipe body, the pipe joint assembly and the geotextile filter are assembled as a whole and buried in the excavation groove to realize pumping and drainage of the seepage section and then pumped to the tertiary sedimentation tank system through the collection well for sedimentation and discharge.

[0011] Furthermore, the anti-clogging head includes a central tube, a plug cylinder and a plug pressure plate, the plug cylinder is fixedly sleeved on the upper part of the central tube, the plug pressure plate is fixedly sleeved on the middle part of the central tube, the bottom of the central tube is fixedly sleeved with a plurality of mud baffles arranged horizontally at intervals, the side walls of the central tube between the mud baffles are provided with water-permeable holes, the mud baffle at the bottom end is encapsulated at the bottom end of the central tube and a mud baffle column is provided on the lower side, and the mud baffle at the bottom end is provided with a through mesh.

[0012] Furthermore, the micro-deflection adjustment mechanism includes a micro-deflection plate, an end plate, an adjustment nut and a supporting connecting column. The top ends of the front docking ring and the rear docking ring are both hinged with micro-deflection plates, the micro-deflection plates are inserted with supporting connecting columns, the supporting connecting columns are provided with external threads, and end plates are provided at both ends of the supporting connecting columns. The end plates are connected with compression springs, and the end plates are connected to adjacent micro-deflection plates through compression springs. The adjustment nut presses the micro-deflection plate toward the end plate through a spiral action to perform micro-deflection adjustment.

[0013] Furthermore, the three-stage sedimentation tank system includes a first sedimentation tank, a second sedimentation tank and a third sedimentation tank. The first sedimentation tank, the second sedimentation tank and the third sedimentation tank are adjacent to each other in sequence and cast through a concrete cushion layer. A first filter cylinder is provided between the first sedimentation tank and the second sedimentation tank, and a second filter cylinder is provided between the second sedimentation tank and the third sedimentation tank. The first sedimentation tank is provided with an upper water inlet, and the third sedimentation tank is provided with a water outlet at the top.

[0014] Furthermore, the first filter cylinder is embedded and fixed at the middle height of the left side of the partition wall between the first sedimentation tank and the second sedimentation tank, and the second filter cylinder is embedded and fixed at the upper height of the right side of the partition wall between the second sedimentation tank and the third sedimentation tank. The first sedimentation tank, the second sedimentation tank and the third sedimentation tank are all provided with a mud extraction system for sedimentation regeneration.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The present invention can directly realize the on-site rapid splicing and assembly of the pipe body and the geofilter, and the inclination setting of the docking angle can be realized through the adjustment device during the splicing process, so that the drainage of seepage water can be carried out at a certain inclination angle as a whole, which is conducive to rapid drainage;

[0017] (2) The present invention uses a geofilter to wrap a continuous PVC pipe body, and the ring body can be quickly installed and evenly wrapped by rotating the ring body, which improves the convenience of operation. The geofilter can effectively filter out the mud and sand in the blind ditch from entering the pipe, saving labor, and the modular segmented sleeve wrapping improves the overall construction efficiency;

[0018] (3) The present invention improves the regeneration efficiency of the sedimentation tank through the structural design of the sedimentation tank system, reduces the decrease in sedimentation capacity caused by the sedimentation of a large amount of soil, and can automatically remove the sediment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the PVC pipe body 1 of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of position A in the middle;

[0021] Figure 3 It is a schematic diagram of the installation structure of the pipe joint assembly 2 and the geofilter 3 of the present invention on the PVC pipe body 1;

[0022] Figure 4 yes Figure 3 A partial enlarged view of position B in the middle;

[0023] Figure 5 It is a schematic diagram of the structure of the three-stage sedimentation tank system 4;

[0024] 1-PVC pipe body, 11-anti-clogging head, 111-center pipe, 111a-mud barrier, 111b-mud barrier column, 112-plug cylinder, 113-plug pressure plate, 2-pipe joint assembly, 21-front docking ring, 22-rear docking ring, 23-hinge base, 231-nail body, 24-wrap ring, 241-threading hole, 25-micro-deviation adjustment mechanism, 251-micro-deviation plate, 252-end plate, 252a-compression spring, 253-adjusting nut, 254-support connecting column, 26-docking bellows, 3-geofilter, 4-three-stage sedimentation tank system, 41-first sedimentation tank, 42-second sedimentation tank, 43-third sedimentation tank, 44-first filter cylinder, 45-second filter cylinder, 46-concrete cushion, 47-mud extraction system. DETAILED DESCRIPTION

[0025] like Figure 1-5 As shown, the present invention provides a long-distance large-diameter pipeline trench dewatering construction device, which specifically includes a PVC pipe body 1, a pipe joint assembly 2 and a geotextile filter 3. The PVC pipe body 1 is provided with holes at intervals of 20 cm along the length direction, and the holes are arranged at intervals along the circumferential direction. The holes are plugged with anti-clogging heads 11. Specifically, the anti-clogging head 11 includes a central pipe 111, a plug cylinder 112 and a plug pressure plate 113. The plug cylinder 112 is fixedly sleeved on the upper part of the central pipe 111, and the plug cylinder 113 is fixedly sleeved on the upper part of the central pipe 111. 112 is used to plug in the drilled hole, and the top of the plug cylinder 112 is provided with a rubber convex head to prevent slipping. The plug pressure plate 113 is fixedly sleeved in the middle of the central tube 111. The bottom of the central tube 111 is fixedly sleeved with a plurality of mud baffles 111a arranged horizontally at intervals. The side wall of the central tube 111 between the mud baffles 111a is provided with water-permeable holes. The mud baffle 111a at the bottom is encapsulated at the bottom of the central tube 111 and is provided with a mud baffle column 111b at the lower side. The mud baffle 111a at the bottom is provided with a through mesh. Through the arrangement of the above-mentioned mud baffles 111a and mud baffle columns 111b, it is not necessary to set up an internal filter screen to realize the water infiltration and suction after the buried pipe body, and to prevent objects such as mud, sand and stones from blocking the drilled hole of the pipe body, thereby ensuring sufficient water-permeable gaps and improving the water infiltration and water absorption effect. At the same time, the high convexity of the inner part of the pipe body can also prevent part of the mud and water from blocking the pores, thus achieving the anti-blocking effect in the pipe.

[0026] The pipe joint assembly 2 is further described below. The pipe joint assembly 2 is used to connect adjacent PVC pipe bodies 1. The pipe joint assembly 2 includes a front docking ring 21, a rear docking ring 22, a hinged base 23, a ring around 24 and a micro-bias adjustment mechanism 25. The front docking ring 21 and the rear docking ring 22 are both hinged on the hinged base 23. The hinged base 23 is provided with a nail body 231. A docking bellows 26 is connected to the relative annular surface between the front docking ring 21 and the rear docking ring 22. The outer end surfaces of the front docking ring 21 and the rear docking ring 22 are both rotatably connected with the ring around 24. The edge of the ring around 24 is provided with a threading hole 241 for sewing the geofilter 3. The micro-bias adjustment mechanism The mechanism 25 is connected between the front docking ring 21 and the rear docking ring 22. The micro-deflection adjustment mechanism 25 includes a micro-deflection plate 251, an end plate 252, an adjustment nut 253 and a support column 254. The front docking ring 21 and the rear docking ring 22 are both hinged with a micro-deflection plate 251 at the top. The micro-deflection plate 251 is inserted with a support column 254. The support column 254 is provided with an external thread. End plates 252 are provided at both ends of the support column 254. The end plate 252 is connected with a compression spring 252a. The end plate 252 is connected to the adjacent micro-deflection plate 251 through the compression spring 252a. The adjustment nut 253 presses the micro-deflection plate 251 toward the end plate 252 through a spiral action to perform micro-deflection adjustment.

[0027] The PVC pipe body 1, the pipe joint assembly 2 and the geotextile filter 3 are integrally assembled and buried in the excavated groove to realize the pumping and drainage of the seepage section and then pumped to the three-stage sedimentation tank system 4 through the water collection well for sedimentation and discharge. The three-stage sedimentation tank system 4 includes a first sedimentation tank 41, a second sedimentation tank 42 and a third sedimentation tank 43. The first sedimentation tank 41, the second sedimentation tank 42 and the third sedimentation tank 43 are adjacent to each other in sequence and cast through a concrete cushion layer 46. A first filter cylinder 44 is provided between the first sedimentation tank 41 and the second sedimentation tank 42, and a second filter cylinder 45 is provided between the second sedimentation tank 42 and the third sedimentation tank 43. The first sedimentation tank 41 is provided with an upper water inlet, and the upper part of the third sedimentation tank 43 is provided with a water outlet. The first filter cylinder 44 is embedded and fixed at the middle height of the left side of the partition wall between the first sedimentation tank 41 and the second sedimentation tank 42, and the second filter cylinder 45 is embedded and fixed at the upper height of the right side of the partition wall between the second sedimentation tank 42 and the third sedimentation tank 43. The first sedimentation tank 41, the second sedimentation tank 42 and the third sedimentation tank 43 are all equipped with a sludge pumping system 47 for sedimentation regeneration. Figure 5 As shown, (1) is a top view and (2) is a side cross-sectional view. The three-stage sedimentation system 4 has the advantage of high regeneration efficiency. The three-stage sedimentation tank system 4 is equipped with a mud pumping system 47 through the sedimentation tank system, which improves the regeneration efficiency of the sedimentation tank, reduces the decrease in sedimentation capacity caused by the sedimentation of a large amount of soil, and can realize the process of automatically removing the sediment in the tank.

[0028] In order to further illustrate the specific construction method of applying the above device, a long-distance large-diameter pipeline trench dewatering construction method is provided, including the following steps:

[0029] Step S1, according to the geological conditions, trenches with a width of 30 cm and a depth of 50 cm are excavated on both sides of the bottom of the foundation pit by manual labor and / or small machinery, and the slope is set to be consistent with the slope of the foundation surface to provide space for installing pipelines;

[0030] Step S2, select a DN150mm PVC pipe body 1, and drill holes on the pipe at a spacing of 20cm. After drilling, install anti-clogging plugs 11 in the holes to prevent clogging by soil after landfill;

[0031] Step S3, using a geofilter 3 to wrap the PVC pipe body 1 in step S2, connecting the adjacent single wrapped pipes with a pipe joint assembly 2 and placing them in the excavated groove, the pipe joint assembly 2 is used for the inclined connection of the adjacent pipe body and the tightening construction of the geofilter 3, this step includes first inserting one end of the PVC pipe body 1 into the ring 24 of the pipe joint assembly 2 and then locking the front corner of the geofilter 3 to the ring 24 through a knitting needle and winding it, then inserting the other end of the PVC pipe body 1 into the ring 24 and then locking the rear corner of the geofilter 3 to the ring 24 through a knitting needle and winding it, until the geofilter 3 is completely wound and the two ends are fixed with knitting needles;

[0032] Step S4, laying a gravel layer with a thickness of 20 to 40 mm on the pipe section installed in step S3 and leveling it until the landfill construction of the entire designated pipe section is completed, and also includes the process of first laying gravel with a size close to the diameter of the drilled hole in the pipe body when laying the gravel layer on the installed pipe section;

[0033] Step S5, digging a 2×2×2m water collection well at the end of the foundation pit where the pipe section has been buried in step S4, to collect muddy water flowing out of the buried pipe body in the blind ditch on both sides of the foundation pit;

[0034] Step S6, the water from the collection well is pumped to the tertiary sedimentation tank system 4 outside the foundation pit for sedimentation and then flows into the surrounding river system, completing the ditch precipitation collection and drainage process.

[0035] In addition, the above step S3 also includes setting the inclined docking angle through the micro-adjustment mechanism 25 of the pipe joint assembly 2 after the pipe joint assembly 2 is docked and placed in the excavated groove, so that the pipe section can be infiltrated and diverted at a certain overall inclination in the entire seepage section.

[0036] The diameter of the large-diameter pipes laid in the foundation pit construction of the present invention is generally 2.8m, and the weight of the 2.2m pipes is between 25t and 45t according to different wall thicknesses, so the bearing capacity index of the foundation is very important. Insufficient bearing capacity will lead to excessive load after the pipeline is installed, foundation collapse, and dislocation of installed pipe sections, etc. It is necessary to re-extract the pipes and process the foundation before reinstalling them, which will cause huge manpower and machine costs. Therefore, in order to ensure the quality of the foundation pit, it is necessary to drain the foundation pit. According to the project's safety and quality requirements for pipeline construction, the traditional method of manually excavating drainage ditches is eliminated in areas such as low-lying buried pipe sections and areas close to reservoirs and ponds.

[0037] The present invention adopts a method of changing the way of using a blind pipe buried in the trench to connect to the water collection well and draining through a sedimentation tank treatment system, thereby minimizing water seepage and accumulation in the foundation pit, reducing the impact on pipeline installation, trench backfilling and slope stability, and at the same time ensuring the safety of the foundation pit and the dryness of the construction surface during the construction process, ensuring that the bearing capacity of the foundation meets the requirements.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A long-distance large-diameter pipeline trench dewatering construction method, characterized by: The following steps are included: Step S1, according to the geological conditions, trenches with a width of 30 cm and a depth of 50 cm are excavated on both sides of the bottom of the foundation pit by manual labor and / or small machinery, and the slope is set to be consistent with the slope of the foundation surface to provide space for installing pipelines; Step S2, select a DN150mm PVC pipe body, and drill holes on the pipe at a spacing of 20cm. After drilling, plug the holes with anti-clogging plugs to prevent clogging by soil after landfill; Step S3, using a geotextile filter to wrap the PVC pipe body in step S2, connecting the adjacent wrapped pipes with a pipe joint assembly and placing them in the excavated groove, the pipe joint assembly is used for the inclined connection of the adjacent pipe body and the tightening construction of the geotextile filter; Step S4, laying a gravel layer with a thickness of 20 to 40 mm on the pipe section installed in step S3 and leveling it until the landfill construction of the entire designated pipe section is completed; Step S5, digging a 2×2×2m water collection well at the end of the foundation pit where the pipe section has been buried in step S4, to collect muddy water collected by the buried pipe body in the blind ditch on both sides of the foundation pit; Step S6, the water from the collection well is pumped to the three-level sedimentation tank system outside the foundation pit for sedimentation and then flows into the surrounding river system, completing the ditch precipitation collection and drainage process.

2. The long-distance large-diameter pipeline trench dewatering construction method according to claim 1 is characterized by: The step S3 includes first inserting one end of the PVC pipe body into the ring of the pipe joint assembly and then locking the front corner of the geofilter to the ring through a knitting needle and winding it, then inserting the other end of the PVC pipe body into the ring and then locking the rear corner of the geofilter to the ring through a knitting needle and winding it, until the geofilter is completely wound and the two ends are fixed with knitting needles.

3. The long-distance large-diameter pipeline trench dewatering construction method according to claim 2 is characterized by: The step S3 includes setting the inclined docking angle through the micro-adjustment mechanism of the pipe joint assembly after the pipe joint assembly is docked and placed in the excavated groove, so that the pipe section can seep and divert water at a certain overall inclination in the entire seepage section.

4. The long-distance large-diameter pipeline trench dewatering construction method and device according to claim 1 is characterized by: The step S4 includes first laying gravel with a diameter close to the diameter of the drilled hole in the pipe body when laying the gravel layer on the installed pipe section.

5. The long-distance large-diameter pipeline trench dewatering construction device according to claim 1 is characterized by: It includes a PVC pipe body, a pipe joint assembly and a geofilter. The PVC pipe body is provided with holes at intervals of 20 cm along the length direction. The holes are arranged at intervals along the circumferential direction. The boreholes are plugged with anti-clogging heads. The pipe joint assembly is used to connect adjacent PVC pipe bodies. The pipe joint assembly includes a front docking ring, a rear docking ring, a hinged base, a winding ring and a micro-deflection adjustment mechanism. The front docking ring and the rear docking ring are both hinged on the hinged base. The hinged base is provided with a nail body. A docking bellows is connected to the relative annular surface between the front docking ring and the rear docking ring. The outer end surfaces of the front docking ring and the rear docking ring are both rotatably connected with the winding ring. The edge of the winding ring is provided with a threading hole for sewing the geofilter. The micro-deflection adjustment mechanism is connected between the front docking ring and the rear docking ring. The PVC pipe body, the pipe joint assembly and the geofilter are assembled as a whole and buried in the excavated groove to realize pumping and drainage of the seepage section and then pumped to the tertiary sedimentation tank system through the water collection well for sedimentation and discharge.

6. The long-distance large-diameter pipeline trench dewatering construction device according to claim 5 is characterized by: The anti-clogging head includes a central tube, a plug cylinder and a plug pressure plate, the plug cylinder is fixedly sleeved on the upper part of the central tube, the plug pressure plate is fixedly sleeved on the middle part of the central tube, a plurality of mud baffles arranged horizontally at intervals are fixedly sleeved on the bottom of the central tube, water permeable holes are provided on the side walls of the central tube between the mud baffles, the mud baffle at the bottom end is sealed at the bottom end of the central tube and a mud baffle column is provided on the lower side, and the mud baffle at the bottom end is provided with a through mesh.

7. The long-distance large-diameter pipeline trench dewatering construction device according to claim 5 is characterized by: The micro-deflection adjustment mechanism includes a micro-deflection plate, an end plate, an adjustment nut and a supporting connecting column. The top ends of the front docking ring and the rear docking ring are both hinged with micro-deflection plates, and the micro-deflection plates are inserted with supporting connecting columns. The supporting connecting columns are provided with external threads, and end plates are provided at both ends of the supporting connecting columns. The end plates are connected with compression springs, and the end plates are connected to adjacent micro-deflection plates through compression springs. The adjustment nut presses the micro-deflection plate toward the end plate through a spiral action to perform micro-deflection adjustment.

8. The long-distance large-diameter pipeline trench dewatering construction device according to claim 5 is characterized by: The three-stage sedimentation tank system includes a first sedimentation tank, a second sedimentation tank and a third sedimentation tank. The first sedimentation tank, the second sedimentation tank and the third sedimentation tank are adjacent to each other in sequence and cast through a concrete cushion layer. A first filter cylinder is provided between the first sedimentation tank and the second sedimentation tank, and a second filter cylinder is provided between the second sedimentation tank and the third sedimentation tank. The first sedimentation tank is provided with an upper water inlet, and the third sedimentation tank is provided with a water outlet at the top.

9. The long-distance large-diameter pipeline trench dewatering construction device according to claim 8 is characterized by: The first filter cylinder is embedded and fixed at the middle height of the left side of the partition wall between the first sedimentation tank and the second sedimentation tank, and the second filter cylinder is embedded and fixed at the upper height of the right side of the partition wall between the second sedimentation tank and the third sedimentation tank. The first sedimentation tank, the second sedimentation tank and the third sedimentation tank are all provided with a mud extraction system for sedimentation regeneration.

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