Pit water collection and drainage system for traffic construction

Abstract

The invention relates to the technical field of underground water structures, in particular to a deep pit water collecting and draining system for traffic construction, which comprises a water pumping pipe and a water filtering pipe, the water filtering pipe comprises an upper end plate and a lower end plate, the upper end plate and the lower end plate are vertically arranged in parallel at intervals, and the outer diameter of the upper end plate and the outer diameter of the lower end plate are the same and larger than the outer diameter of the water pumping pipe. An outer-layer pipe is connected between the upper end plate and the lower end plate, filtering holes are formed in the side wall of the outer-layer pipe, inner-layer pipes are coaxially arranged in the outer-layer pipe at intervals, the pipe walls of the inner-layer pipes and the outer-layer pipes are corrugated pipes capable of being folded and deformed, a movable support is connected between the upper end plate and the lower end plate, and the movable support is connected with the outer-layer pipe and the inner-layer pipes. The outer-layer pipe and the inner-layer pipe are folded or unfolded in the radial direction, the outer-layer pipe and the inner-layer pipe are in a folded state in the initial state, and the outer diameter of the outer-layer pipe is not larger than that of the upper end plate. The technical problems that in the prior art, a water filtering pipe is prone to being damaged, and water filtering holes are prone to being blocked can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground underwater structures, and particularly relates to a deep pit water collection and drainage system for traffic construction. Background Art

[0002] When excavating a foundation pit, the groundwater level is higher than the excavation bottom surface, and groundwater will continuously seep into the pit. To ensure that the foundation pit can be constructed under dry conditions and prevent slope instability, foundation quicksand, bottom heave, bottom piping, and a decrease in foundation bearing capacity, it is necessary to carry out foundation pit dewatering work. The main methods of foundation pit dewatering are: open ditch plus sump well dewatering, light well point dewatering, jet well point dewatering, electroosmosis well point dewatering, deep well point dewatering, and so on. As Figure 1 shown in the deep pit water collection and drainage system, the deep pit water collection and drainage system includes a plurality of drain pipes 100 arranged side by side, and an above-ground connecting pipe connecting the plurality of drain pipes 100. The deep pit water collection and drainage system further includes a water pump and a drain pipe 2. When the deep pit water collection and drainage system is dewatering the deep pit, the plurality of drain pipes 100 need to be lowered into the dewatering well, and then the water pump is started to pump out the groundwater in the dewatering well.

[0003] During the pumping process, the lower end of the drain pipe needs to use a filter pipe for water filtration to filter out mud clumps and impurities in the water. Most of the existing filter pipes for foundation pit dewatering are single-layer pipe body filter pipes, which are easily damaged; moreover, when the existing filter pipes for foundation pit dewatering filter water, the mud clumps on the side wall of the dewatering well are likely to block the water permeable holes in the filter pipe, causing the water permeable holes to be blocked. Summary of the Invention

[0004] To overcome the deficiencies of the prior art, the present invention provides a deep pit water collection and drainage system for traffic construction to solve the technical problems in the prior art that the filter pipe is easily damaged and the water permeable holes are easily blocked.

[0005] The deep pit water collection and drainage system for traffic construction of the present invention adopts the following technical solutions: A deep - pit water collection and drainage system for traffic construction includes a water extraction pipe extending in the vertical direction and a filter pipe connected to the lower end of the water extraction pipe. The axis of the filter pipe extends in the vertical direction. The filter pipe includes an upper end plate and a lower end plate. The upper end plate and the lower end plate are arranged parallel and spaced apart vertically. The outer diameters of the upper end plate and the lower end plate are the same and larger than the outer diameter of the water extraction pipe. The upper end plate is fixed to the lower end of the water extraction pipe, and a water inlet hole communicating with the inside of the water extraction pipe is provided at the center of the upper end plate. An outer layer pipe is connected between the upper end plate and the lower end plate. Filter holes are provided on the side wall of the outer layer pipe. An inner layer pipe is coaxially and spacedly arranged inside the outer layer pipe. The pipe walls of the inner layer pipe and the outer layer pipe are both corrugated pipes that can be folded and deformed. An activity support is connected between the upper end plate and the lower end plate. The activity support is respectively connected to the outer layer pipe and the inner layer pipe to drive the outer layer pipe and the inner layer pipe to fold or expand radially. The outer layer pipe and the inner layer pipe are in a folded state in the initial state. At this time, the outer diameter of the outer layer pipe is not larger than the outer diameter of the upper end plate. After the water extraction pipe is lowered into the precipitation well, the activity support drives the outer layer pipe and the inner layer pipe to expand radially. At this time, the outer diameter of the outer layer pipe is larger than the outer diameter of the upper end plate.

[0006] Further, the side wall of the outer layer pipe is elastic. When the outer layer pipe is in the expanded state, after the side wall of the outer layer pipe is subjected to a radial extrusion force, the side wall of the outer layer pipe can be recessed inward radially. A plurality of thimbles are fixedly spaced on the outer wall of the inner layer pipe. The thimbles extend along the radial direction of the inner layer pipe. One end of each thimble is fixed to the outer wall of the inner layer pipe, and the other end extends outwardly suspended from the inner layer pipe. The positions of the thimbles respectively correspond to the positions of the filter holes on the side wall of the outer layer pipe. When the side wall of the outer layer pipe is recessed inward, the suspended end of the thimble extends into the corresponding filter hole to push the sludge at the filter hole outward.

[0007] Further, the activity support includes a plurality of outer support columns and a plurality of inner support columns arranged parallel and spaced apart. The plurality of outer support columns and the plurality of inner support columns respectively extend in the vertical direction. The plurality of outer support columns are respectively located inside the outer layer pipe and are evenly spaced along the circumferential direction of the outer layer pipe and are connected to the inner wall of the outer layer pipe. The plurality of inner support columns are respectively located inside the inner layer pipe and are evenly spaced along the circumferential direction of the inner layer pipe and are connected to the inner wall of the inner layer pipe.

[0008] Further, the upper and lower ends of each outer support column are respectively hinged with a first connecting rod and a second connecting rod. The first connecting rod and the second connecting rod hinged to the upper end of the outer support column are located above the inner layer tube, and the first connecting rod and the second connecting rod hinged to the lower end of the outer support column are located below the inner layer tube. The ends of the first connecting rod and the second connecting rod far from the outer support column are respectively hinged to the ends of two adjacent inner support columns. A plurality of upper guide rails are fixed to the lower side of the upper end plate, and a plurality of lower guide rails are fixed to the upper side of the lower end plate. A movable column is slidably arranged in each of the upper guide rails and the lower guide rails. The movable column is located inside the inner layer tube and on the side of the inner support column facing the center of the inner layer tube. Each movable column is respectively hinged with a third connecting rod and a fourth connecting rod. The ends of the third connecting rod and the fourth connecting rod far from the movable column are respectively hinged to the ends of two adjacent inner support columns. The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod form a parallelogram mechanism.

[0009] Further, one of the movable columns is connected with a telescopic driving mechanism. The telescopic movement of the telescopic driving mechanism can drive each movable column to move along the upper guide rail and the lower guide rail respectively, so as to drive the outer layer tube and the inner layer tube to fold or expand.

[0010] Further, the telescopic driving mechanism is a telescopic cylinder. The telescopic cylinder includes a cylinder body and a telescopic rod movably arranged in the cylinder body. The cylinder body is fixed to the upper side of the lower end plate, and one end of the telescopic rod is connected with one of the movable columns.

[0011] Further, both the upper guide rail and the lower guide rail are strip-shaped grooves, and the upper guide rail and the lower guide rail are respectively fixed to the upper end plate and the lower end plate through fasteners.

[0012] Further, a sealing sleeve is respectively connected between the upper end of the outer layer tube and the edge of the upper end plate and between the lower end of the outer layer tube and the edge of the lower end plate. The sealing sleeve respectively seals between the upper end of the outer layer tube and the upper end plate and between the lower end of the outer layer tube and the lower end plate.

[0013] Further, a plurality of upper guide rails are arranged at equal intervals in a radial pattern around the center of the upper end plate, and a plurality of lower guide rails are arranged at equal intervals in a radial pattern around the center of the lower end plate.

[0014] Further, both the outer layer tube and the inner layer tube are in a regular polygon structure after being expanded.

[0015] The beneficial effects of the present invention are as follows: For a deep - pit water collection and drainage system for traffic construction of the present invention, by setting two layers of inner and outer pipes, each layer of pipe can be folded and deformed. The multi - layer filter pipe structure has better strength and is not easily damaged. Moreover, the inner and outer layers of pipes that can be folded and deformed can be conveniently lowered into the precipitation well after folding. After being expanded, they are in contact with the inner wall of the precipitation well for support, facilitating the fixation of the filter pipe in the precipitation well. Further, thimbles are provided on the outer wall of the inner layer pipe, and the outer layer pipe is elastic and will deform by depression under pressure. The thimbles on the inner layer pipe will extend into the water - filtering holes on the outer layer pipe to push out the sludge blocking the filtering holes, preventing the water - filtering holes of the outer layer pipe from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0017] Figure 1 Schematic diagram of the deep - pit water collection and drainage system in the prior art; Figure 2 Schematic diagram of the structure of an embodiment of a deep - pit water collection and drainage system for traffic construction of the present invention (in the initial state); Figure 3 For Figure 2 Cross - sectional view taken along line A - A in Figure 4 Schematic diagram of the structure of an embodiment of a deep - pit water collection and drainage system for traffic construction of the present invention (in the expanded state); Figure 5 For Figure 4 Cross - sectional view taken along line B - B in Figure 6 Explosion schematic diagram of an embodiment of a deep - pit water collection and drainage system for traffic construction of the present invention; Figure 7 Schematic diagram of the outer layer pipe in an embodiment of a deep - pit water collection and drainage system for traffic construction of the present invention; Figure 8 Schematic diagram of the inner layer pipe in an embodiment of a deep - pit water collection and drainage system for traffic construction of the present invention; Figure 9 Schematic diagram of the connection between the movable support and the upper end plate and the lower end plate in an embodiment of a deep - pit water collection and drainage system for traffic construction of the present invention; Figure 10 For Figure 9 Enlarged view of the partial C in

[0018] In the figure: 1, water pump; 2, drain pipe; 3, filter pipe; 100, suction pipe; 101, upper end plate; 1011, water inlet hole; 102, lower end plate; 103, strip-shaped groove body; 104, movable column; 200, outer layer pipe; 201, outer support column; 202, filter hole; 300, inner layer pipe; 301, inner support column; 302, thimble; 400, movable bracket; 500, telescopic driving mechanism. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" used in this application, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0021] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0022] An embodiment of a deep pit water collection and drainage system for traffic construction of the present invention is as Figures 2 to 10As shown in the figure, the deep - pit water collection and drainage system for traffic construction includes a water extraction pipe 100 extending in the up - down direction, and a filter pipe 3 connected to the lower end of the water extraction pipe 100. During use, the water extraction pipe 100 and the filter pipe 3 at its lower end are lowered into the precipitation well together. The upper end of the water extraction pipe 100 is connected to a water pump on the ground, and the water in the precipitation well is pumped out by the water pump.

[0023] In the present invention, the axis of the filter pipe 3 extends in the up - down direction. The filter pipe 3 includes an upper end plate 101 and a lower end plate 102. The upper end plate 101 and the lower end plate 102 are arranged parallel to each other at an interval in the up - down direction. The outer diameters of the upper end plate 101 and the lower end plate 102 are the same and larger than the outer diameter of the water extraction pipe 100. The upper end plate 101 is fixed to the lower end of the water extraction pipe 100, and a water inlet hole 1011 communicating with the inside of the water extraction pipe 100 is provided at the center of the upper end plate 101. An outer layer pipe 200 is connected between the upper end plate 101 and the lower end plate 102, and filter holes 202 are formed on the side wall of the outer layer pipe 200. In order to achieve the sealed connection between the upper and lower ends of the outer layer pipe 200 and the upper end plate 101 and the lower end plate 102 respectively, in this embodiment, sealing sleeves (not shown in the figure) are respectively connected between the upper end of the outer layer pipe 200 and the edge of the upper end plate 101 and between the lower end of the outer layer pipe 200 and the edge of the lower end plate 102, and the sealing sleeves respectively seal between the upper end of the outer layer pipe 200 and the upper end plate 101 and between the lower end of the outer layer pipe 200 and the lower end plate 102.

[0024] In the present invention, an inner layer pipe 300 is coaxially and spacedly arranged inside the outer layer pipe 200. The pipe walls of the inner layer pipe 300 and the outer layer pipe 200 are both corrugated pipes capable of folding and deforming. An activity support 400 is connected between the upper end plate 101 and the lower end plate 102. The activity support 400 is respectively connected to the outer layer pipe 200 and the inner layer pipe 300 to drive the outer layer pipe 200 and the inner layer pipe 300 to fold or expand radially. The outer layer pipe 200 and the inner layer pipe 300 are in a folded state in the initial state. At this time, the outer diameter of the outer layer pipe 200 is not larger than the outer diameter of the upper end plate 101, and the outer diameter of the upper end plate 101 is smaller than the inner diameter of the precipitation well, so that it is convenient to lower the filter pipe 3 into the precipitation well. After the water extraction pipe 100 is lowered into the precipitation well, the activity support 400 drives the outer layer pipe 200 and the inner layer pipe 300 to expand radially. After expansion, both the outer layer pipe 200 and the inner layer pipe 300 are in a regular polygon structure. At this time, the outer diameter of the outer layer pipe 200 is larger than the outer diameter of the upper end plate 101, so that the outer wall of the outer layer pipe 200 can support - contact with the inner wall of the precipitation well, and the outer wall of the outer layer pipe 200 extrudes the sand and gravel layer in the precipitation well, and the lower end of the water extraction pipe 100 can be fixed in the precipitation well.

[0025] In this embodiment, the side wall of the outer tube 200 is elastic. When the outer tube 200 is in the expanded state, after the side wall of the outer tube 200 is subjected to a radial squeezing force, the side wall of the outer tube 200 can be recessed inward in the radial direction. For example, after a part of the filter holes 202 on the side wall of the outer tube 200 is blocked, under the action of the suction force of the water pump, the side wall of the outer tube 200 will be subjected to a radial squeezing force, so that the side wall of the outer tube 200 will be recessed inward in the radial direction and deformed. The inward recessed deformation of the side wall of the outer tube 200 will cause the internal volume of the outer tube 200 to shrink. Further, in this embodiment, a plurality of ejector pins 302 are fixedly arranged at intervals on the outer wall of the inner tube 300. The ejector pins 302 extend in the radial direction of the inner tube 300. One end of each ejector pin 302 is fixed to the outer wall of the inner tube 300, and the other end extends outwardly overhanging the inner tube 300. The positions of the respective ejector pins 302 correspond to the positions of the filter holes 202 on the side wall of the outer tube 200. When the side wall of the outer tube 200 is recessed and deformed inwardly, the overhanging end of the ejector pin 302 will extend into the corresponding filter hole 202, so that the sludge at the filter hole 202 can be pushed outwards, thereby opening the blocked filter hole 202.

[0026] In this embodiment, the movable bracket 400 includes a plurality of outer support columns 201 and a plurality of inner support columns 301 that are arranged in parallel and spaced apart. The plurality of outer support columns 201 and the plurality of inner support columns 301 respectively extend in the up and down directions. The plurality of outer support columns 201 are respectively located inside the outer tube 200 and are evenly spaced along the circumferential direction of the outer tube 200 and are connected to the inner wall of the outer tube 200. The plurality of inner support columns 301 are respectively located inside the inner tube 300 and are evenly spaced along the circumferential direction of the inner tube 300 and are connected to the inner wall of the inner tube 300.

[0027] In this embodiment, the upper and lower ends of each outer support column 201 are respectively hinged with a first connecting rod and a second connecting rod. The first connecting rod and the second connecting rod hinged to the upper end of the outer support column 201 are located above the inner layer pipe 300, and the first connecting rod and the second connecting rod hinged to the lower end of the outer support column 201 are located below the inner layer pipe 300. The ends of the first connecting rod and the second connecting rod far from the outer support column 201 are respectively hinged and connected to the ends of two adjacent inner support columns 301. A plurality of upper guide rails are fixed on the lower side of the upper end plate 101, and a plurality of lower guide rails are fixed on the upper side of the lower end plate 102. The plurality of upper guide rails are arranged at equal intervals radially around the center of the upper end plate 101, and the plurality of lower guide rails are arranged at equal intervals radially around the center of the lower end plate 102. Moving columns 104 are respectively slidably arranged in each upper guide rail and each lower guide rail. The moving columns 104 are located inside the inner layer pipe 300, and the moving columns 104 are located on the side of the inner support column 301 facing the center of the inner layer pipe 300. Each moving column 104 is respectively hinged with a third connecting rod and a fourth connecting rod. The ends of the third connecting rod and the fourth connecting rod far from the moving column 104 are respectively hinged and connected to the ends of two adjacent inner support columns 301. The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod enclose a parallelogram mechanism. One of the moving columns 104 is connected with a telescopic driving mechanism 500. The telescopic movement of the telescopic driving mechanism 500 can drive each moving column 104 to move respectively along the upper guide rail and the lower guide rail. Each moving column 104 moves along the upper guide rail and the lower guide rail, and then drives the inner support column 301 and the outer support column 201 to move radially along the filter water pipe 3 through the parallelogram mechanism, so as to drive the outer layer pipe 200 and the inner layer pipe 300 to fold or expand.

[0028] In this embodiment, the telescopic driving mechanism 500 is a telescopic cylinder. The telescopic cylinder includes a cylinder body and a telescopic rod movably arranged in the cylinder body. The cylinder body is fixed on the upper side of the lower end plate 102. One end of the telescopic rod is connected with one of the moving columns 104, and the extending direction of the telescopic rod is the same as the extending direction of one of the lower guide rails. The upper guide rail and the lower guide rail are both strip-shaped grooves 103, and the upper guide rail and the lower guide rail are respectively fixed on the upper end plate 101 and the lower end plate 102 through fasteners.

[0029] The working process of a deep pit water collection and drainage system for traffic construction of the present invention: The water extraction pipe 100 together with the filter water pipe 3 is inserted downward into the precipitation well. The upper end of the water extraction pipe 100 is connected with a water pump, and the water in the precipitation well is pumped outwards through the suction force generated by the water pump.

[0030] In the initial state, as Figure 3As shown, the inner tube 300 and the outer tube 200 are in a folded and contracted state, and the outer diameter of the outer tube 200 is the same as the outer diameter of the upper end plate 101 and the lower end plate 102, so that it is convenient for the pumping pipe 100 and the filter pipe 3 to be placed downward into the precipitation well. Then, after the pumping pipe 100 is placed in the set depth, the telescopic drive mechanism 500 is started, and then the movable bracket 400 is pushed to expand and deform, so as to open the outer tube 200 and the inner tube 300, as shown in FIG. Figure 5 In the state shown, the outer tube 200 and the inner tube 300 are both regular polygonal structures after being expanded. In the process of the outer tube 200 and the inner tube 300 expanding outward, the outer diameter of the outer tube 200 is larger than the outer diameter of the upper end plate 101, and the outer tube 200 will squeeze the sand and gravel layer in the precipitation well, making the sand and gravel layer in the precipitation well tighter, and because the outer tube 200 is a regular polygon, there will be space between the outer wall of the outer tube 200 and the inner wall of the precipitation well for water flow to pass through. In addition, in the present invention, the thickness of the upper end of the outer tube 200 is thicker and the thickness of the lower end is thinner, so that the elastic deformation capacity of the upper end of the outer tube 200 is lower than the elastic deformation capacity of the lower end, so that when the outer tube 200 is expanded, the upper end of the outer tube 200 squeezes the sand and gravel layer to a greater extent.

[0031] After the inner tube 300 and the outer tube 200 are spread apart, the water pump is started, and the water in the precipitation well enters the outer tube 200 through the filter holes 202. Since the upper and lower ends of the outer tube 200 are sealed and connected to the upper end plate 101 and the lower end plate 102 through the plugging sleeve, and the upper and lower ends of the inner tube 300 are not blocked from the upper and lower ends and the upper and lower end plates 101 and 102, the water entering the outer tube 200 will pass through the upper and lower ends of the inner tube 300 and enter the pumping pipe 100 from the water inlet hole 1011 in the center of the upper end plate 101. When some of the filter holes 202 on the outer tube 200 are blocked, the suction force on the outer tube 200 will increase, and the outer tube 200 will be deformed inwardly. When the outer tube 200 is deformed inwardly, the ejector pin 302 will extend into the corresponding filter hole 202, and can push the impurities in the filter hole 202 outward. When the telescopic driving mechanism 500 pushes the movable support 400 to expand the outer tube 200 outward, air is ventilated into the water pumping pipe 100, so that a supporting force can be given to the outer tube 200 from the inside, making it easier for the outer tube 200 and the inner tube 300 to expand outward.

[0032] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A deep pit water collection and drainage system for traffic construction, comprising a water extraction pipe (100) extending in the vertical direction, and a filter pipe (3) connected to the lower end of the water extraction pipe (100), wherein the axis of the filter pipe (3) extends in the vertical direction, characterized in that, The filter pipe (3) includes an upper end plate (101) and a lower end plate (102). The upper end plate (101) and the lower end plate (102) are arranged parallel to each other at an interval in the vertical direction. The outer diameters of the upper end plate (101) and the lower end plate (102) are the same and larger than the outer diameter of the water extraction pipe (100). The upper end plate (101) is fixed to the lower end of the water extraction pipe (100), and a water inlet hole (1011) communicating with the inside of the water extraction pipe (100) is provided at the center of the upper end plate (101). An outer layer pipe (200) is connected between the upper end plate (101) and the lower end plate (102). Filter holes (202) are formed in the side wall of the outer layer pipe (200). An inner layer pipe (300) is arranged coaxially and at an interval inside the outer layer pipe (200). The pipe walls of the inner layer pipe (300) and the outer layer pipe (200) are both corrugated pipes capable of folding and deforming. An active support (400) is connected between the upper end plate (101) and the lower end plate (102). The active support (400) is respectively connected to the outer layer pipe (200) and the inner layer pipe (300) to drive the outer layer pipe (200) and the inner layer pipe (300) to fold or expand radially. The outer layer pipe (200) and the inner layer pipe (300) are in a folded state in the initial state. At this time, the outer diameter of the outer layer pipe (200) is not larger than the outer diameter of the upper end plate (101). After the water extraction pipe (100) is lowered into the precipitation well, the active support (400) drives the outer layer pipe (200) and the inner layer pipe (300) to expand radially. At this time, the outer diameter of the outer layer pipe (200) is larger than the outer diameter of the upper end plate (101).

2. The deep pit water collection and drainage system for traffic construction according to claim 1, wherein: The side wall of the outer layer pipe (200) has elasticity. When the outer layer pipe (200) is in an expanded state, after the side wall of the outer layer pipe (200) is subjected to a radial extrusion force, the side wall of the outer layer pipe (200) can be recessed inward radially. A plurality of ejector pins (302) are fixedly arranged at intervals on the outer wall of the inner layer pipe (300). The ejector pins (302) extend radially along the inner layer pipe (300). One end of each ejector pin (302) is fixed to the outer wall of the inner layer pipe (300), and the other end extends outwardly suspended from the inner layer pipe (300). The positions of the ejector pins (302) respectively correspond to the positions of the filter holes (202) on the side wall of the outer layer pipe (200). When the side wall of the outer layer pipe (200) is recessed inward, the suspended end of the ejector pin (302) extends into the corresponding filter hole (202) to push the sludge at the filter hole (202) outwards.

3. The deep pit water collection and drainage system for traffic construction according to claim 2, characterized in that: The movable support (400) includes a plurality of outer support columns (201) and a plurality of inner support columns (301) which are arranged in parallel at intervals. The plurality of outer support columns (201) and the plurality of inner support columns (301) respectively extend in the up and down directions. The plurality of outer support columns (201) are respectively located inside the outer layer tube (200), are arranged at uniform intervals along the circumferential direction of the outer layer tube (200), and are connected to the inner wall of the outer layer tube (200). The plurality of inner support columns (301) are respectively located inside the inner layer tube (300), are arranged at uniform intervals along the circumferential direction of the inner layer tube (300), and are connected to the inner wall of the inner layer tube (300).

4. The deep pit water collection and drainage system for traffic construction according to claim 3, characterized in that: A first link and a second link are respectively hinged to the upper end and the lower end of each outer support column (201). The first link and the second link hinged to the upper end of the outer support column (201) are located above the inner layer tube (300), and the first link and the second link hinged to the lower end of the outer support column (201) are located below the inner layer tube (300). The ends of the first link and the second link far away from the outer support column (201) are respectively hinged and connected to the ends of two adjacent inner support columns (301). A plurality of upper guide rails are fixed to the lower side of the upper end plate (101), and a plurality of lower guide rails are fixed to the upper side of the lower end plate (102). An activity column (104) is slidably arranged in each of the upper guide rails and the lower guide rails. The activity column (104) is located inside the inner layer tube (300), and the activity column (104) is located on the side of the inner support column (301) facing the center of the inner layer tube (300). A third link and a fourth link are respectively hinged to each activity column (104). The ends of the third link and the fourth link far away from the activity column (104) are respectively hinged and connected to the ends of two adjacent inner support columns (301). The first link, the second link, the third link and the fourth link form a parallelogram mechanism.

5. The deep pit water collection and drainage system for traffic construction according to claim 4, wherein: One of the activity columns (104) is connected with a telescopic driving mechanism (500). The telescopic movement of the telescopic driving mechanism (500) can drive each activity column (104) to respectively move along the upper guide rail and the lower guide rail, and further drive the outer layer tube (200) and the inner layer tube (300) to fold or expand.

6. The deep pit water collection and drainage system for traffic construction according to claim 5, characterized in that: The telescopic driving mechanism (500) is a telescopic cylinder. The telescopic cylinder includes a cylinder body and a telescopic rod movably arranged in the cylinder body. The cylinder body is fixed to the upper side of the lower end plate (102), and one end of the telescopic rod is connected with one of the activity columns (104).

7. The deep pit water collection and drainage system for traffic construction according to claim 6, characterized in that: Both the upper guide rail and the lower guide rail are strip-shaped grooves (103), and the upper guide rail and the lower guide rail are respectively fixed to the upper end plate (101) and the lower end plate (102) through fasteners.

8. The deep pit water collection and drainage system for traffic construction according to claim 7, characterized in that: Sealing sleeves are respectively connected between the upper end of the outer layer tube (200) and the edge of the upper end plate (101) and between the lower end of the outer layer tube (200) and the edge of the lower end plate (102). The sealing sleeves respectively seal the space between the upper end of the outer layer tube (200) and the upper end plate (101) and the space between the lower end of the outer layer tube (200) and the lower end plate (102).

9. The deep pit water collection and drainage system for traffic construction according to claim 8, characterized in that: A plurality of upper guide rails are arranged at equal intervals radially around the center of the upper end plate (101), and a plurality of lower guide rails are arranged at equal intervals radially around the center of the lower end plate (102).

10. The deep pit water collection and drainage system for traffic construction according to claim 9, characterized in that: After being expanded, both the outer layer tube (200) and the inner layer tube (300) are in a regular polygon structure.

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