Deepwater-level foundation pit dewatering construction structure and construction method thereof
The deep water table excavation drainage structure addresses the challenge of managing groundwater in deep excavations by isolating and pumping water to a storage well outside urban drainage systems, reducing network burden and ensuring water quality through filtration.
Patent Information
- Application Number
- CN202411936803.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-03-25
AI Technical Summary
Current methods for managing groundwater in deep excavation projects, where the water table is higher than the designed base, often overwhelm city drainage systems, leading to potential clogging and pressure issues in urban drainage networks.
A deep water table excavation drainage structure comprising a barrier wall, a collection well, a storage well, and pumping equipment that isolates groundwater within the excavation site, allowing water to be pumped to the storage well outside the barrier, reducing the burden on urban drainage systems and enabling water reuse.
This solution effectively manages groundwater within the excavation site by isolating it from urban drainage networks, reducing the risk of clogging and pressure on city systems while allowing for water reuse and maintaining water quality through filtration systems.
Smart Images
Figure CN119686360A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of foundation pit construction, and in particular to a deep water level foundation pit dewatering construction structure and a construction method thereof. Background Art
[0002] During foundation pit construction, faced with geological conditions where the groundwater level is higher than the designed base of the foundation pit, construction usually involves digging a collection well below the bottom of the foundation pit. The groundwater will seep into the collection well, and then the groundwater will be pumped out from the collection well to dewater the foundation pit.
[0003] At present, groundwater extracted from foundation pits is usually discharged into the municipal pipe network through pipes. However, when the location structure or drainage capacity of the municipal pipe network is not sufficient to support the drainage of the foundation pit, forcibly draining water through the municipal pipe network may increase the operating pressure of the pipe network, causing the risk of poor drainage or even blockage. Summary of the invention
[0004] In order to reduce the burden of foundation pit drainage on the municipal pipe network, the present application provides a deep water level foundation pit dewatering construction structure and a construction method thereof.
[0005] In the first aspect, the present application provides a deep water level foundation pit dewatering construction structure, which adopts the following technical solution: A deep water level foundation pit dewatering construction structure, comprising: The retaining wall is built around the foundation pit to isolate the groundwater flow inside and outside the foundation pit; A water collection well extending downward from the bottom of the foundation pit, the well wall having water permeable holes for connecting the inside and outside of the water collection well; A water storage well extending downward from the foundation surface, with an inner bottom wall lower than the inner bottom wall of the water collection well and located outside the retaining wall; a pumping device, arranged between the water collection well and the water storage well, for pumping water from the water collection well into the water storage well; and A water intake device is connected to the bottom of the water storage well and is used to extract water from the water storage well.
[0006] By adopting the above technical scheme, the groundwater flow inside and outside the foundation pit is isolated by the retaining wall, the groundwater is collected by the collection well, and the water in the collection well is pumped to the water storage well outside the retaining wall by the pumping device, and finally the water in the water storage well is pumped out by the water intake device, so that the water pumped out of the foundation pit does not need to be discharged to the municipal pipeline network, thereby reducing the burden of foundation pit drainage on the municipal pipeline network, and at the same time the water source can be utilized.
[0007] Optionally, a water hole is provided on the wall of the water storage well, the position of the water hole is opposite to the groundwater position and close to the groundwater level; and an adjusting member is movable in the water storage well, the adjusting member is provided with a connecting hole, and the adjusting member can be movable to a position where the connecting hole is opposite to or offset from the water hole; When the connecting hole is opposite to the water hole, the water flow on both sides of the water storage well is connected with the water hole through the connecting hole; when the connecting hole is misaligned with the water hole, the adjusting member blocks the water flow connection path on both sides of the water storage well.
[0008] By adopting the above technical solution, by setting a water hole on the wall of the water storage well and equipping it with a movable adjusting member to control the opening and closing of the water hole, flexible control of the water flow connection inside and outside the water storage well is achieved.
[0009] Optionally, the outer wall of the water storage well at the water hole is covered with a permeable geotextile.
[0010] By adopting the above technical solution, external mud, impurities, etc. are not easy to enter the water storage well, thereby improving the cleanliness of the water quality in the water storage well and the smoothness of water pumping, and also extending the service life of the water storage well.
[0011] Optionally, the adjusting member is made of a material that can float on the water surface, the adjusting member is in a ring shape with an outer wall that fits the inner wall of the water storage well, and the adjusting member moves up and down in the water collection well; the adjusting member includes a connecting section and a water retaining section that are sequentially arranged from top to bottom, and the connecting hole is arranged on the connecting section; When the liquid level in the water storage well is lower than the water through hole, the adjusting member is driven to float to the connecting section and opposite to the water through hole, so that the connecting hole is connected to the water through hole; when the liquid level in the water storage well is higher than the water through hole, the adjusting member is driven to float to the water retaining section and opposite to the water through hole, so that the connecting hole is misaligned with the water through hole.
[0012] By adopting the above technical solution, an adjusting member that can float on the water surface is used, and the position of the adjusting member is automatically adjusted according to the height of the liquid level in the water storage well, thereby realizing automatic adjustment of the opening and closing of the water hole, so that when the liquid level in the water storage well is low, water can be replenished through the groundwater layer, and when the liquid level in the water storage well is high, the water in the well is blocked from flowing out by the water retaining wall.
[0013] Optionally, the water retaining section has a travel portion, and the wall of the water storage well is provided with a travel groove for the travel portion to move up and down.
[0014] By adopting the above technical solution, by arranging a travel groove on the wall of the water storage well and arranging a travel part matching with the travel groove on the adjusting member, the upward and downward movement of the adjusting member can be guided and limited.
[0015] Optionally, a sewage interception basket is provided in the water storage well for moving up and down, and a driving assembly is provided outside the water storage well for driving the sewage interception basket to move; the sewage interception basket includes a basket body and a filter cloth; the basket body is hollow and forms a sewage interception cavity opening upward; the filter cloth is detachably connected to the basket body to filter the water flow entering the lower side of the sewage interception basket.
[0016] By adopting the above technical solution, by setting a dirt interception basket in the water storage well and equipping a driving assembly to drive the dirt interception basket to move, the water flow entering the water storage well is filtered and dirt is intercepted, so that impurities and dirt are not easy to enter the position under the dirt interception basket, and the cleanliness of the pumped water is improved.
[0017] Optionally, the dirt intercepting basket is located above the adjusting member, and when the adjusting member is immersed in water, the dirt intercepting basket can use its own gravity to press down the adjusting member to drive the adjusting member to move downward.
[0018] By adopting the above technical solution, the gravity of the sewage interception basket is used to press down the adjusting member, thereby driving the adjusting member to move downward to open the water hole, so that when the water level in the water storage well is too high, the water in the water storage well can be discharged into the groundwater layer to prevent the water in the water storage well from overflowing easily.
[0019] Optionally, the basket includes a bottom plate, a side plate and a limit frame; the size of the bottom plate is adapted to the cross-sectional size of the water storage well; there are multiple side plates, the multiple side plates are distributed along the circumference of the bottom plate and are hinged at the edge of the bottom plate, and when the side plate surface is rotated upward to be perpendicular to the bottom plate surface, the multiple side plates are abutted in sequence along the circumference of the bottom plate, and the sewage interception cavity is formed in the space enclosed by the side plates; The side plate has an embedding groove on one end surface away from the bottom plate. When the side plate is perpendicular to the bottom plate, the embedding grooves on the side plates are connected to each other. The limit frame can be simultaneously inserted into the embedding grooves of each side plate and locked with the side plate through fasteners. The limit frame can also simultaneously press the peripheral side of the filter cloth into the embedding groove.
[0020] By adopting the above technical solution, by adopting the detachable filter cloth and the hinged side panel design, the flexible assembly and disassembly of the waste interception basket is realized, which is convenient for cleaning and replacing the filter cloth, and also convenient for the maintenance and care of the waste interception basket. Moreover, the side panel is hinged relative to the bottom panel so that the side panel can be unfolded relative to the bottom panel when the waste interception basket is transported, so as to reduce the thickness of the waste interception basket for easy transportation.
[0021] Optionally, the driving assembly includes a traction rope and a winding power source, and the side plate, the traction rope and the winding power source correspond to each other one by one; the winding power source is located outside the water storage well, one end of the traction rope is connected to the side plate, and the other end of the traction rope is wound on the winding power source, and the winding power source reels and unwinds the traction rope.
[0022] By adopting the above technical solution, the dirt intercepting basket is driven to move by using a driving assembly consisting of a traction rope and a winding power source, thereby achieving precise control and adjustment of the position of the dirt intercepting basket.
[0023] In a second aspect, the present application provides a construction method for a deep water level foundation pit dewatering construction structure, which adopts the following technical solution: A construction method for a deep water level foundation pit dewatering construction structure comprises the following steps: Retaining wall construction: excavation and pouring of retaining walls around the foundation pit; The water storage well construction involves digging from the foundation surface downwards and placing the prefabricated water storage well in it, while matching the water intake device with the water storage well, and then backfilling the soil to fix the water storage well; Sump construction: excavate the foundation surface and place the prefabricated sump into it; Installation of a pumping device: installing the pumping device between the water storage well and the water collection well and pumping the accumulated water in the water collection well into the water storage well; Foundation pit excavation: digging the foundation pit downward from the foundation surface.
[0024] In summary, the present application includes at least one of the following beneficial effects: 1. By setting up retaining walls, water collection wells, water storage wells, pumping devices and water intake devices, water in the water collection wells can be pumped to the water storage wells for non-domestic use, so that precipitation can be achieved in the foundation pit and the burden on the municipal pipe network can be reduced; 2. The present application utilizes a regulating member floating on the water surface to automatically regulate the connectivity between the inside and outside of a water storage well, so that when the water flow in the water storage well is low, water from the groundwater layer is added to the water storage well, and when the water level in the water storage well rises, the connectivity between the water flow inside and outside the water storage well is cut off, so that water can be continuously stored in the water storage well; 3. The cleanliness of water drawn from the water storage well is improved by filtering the water flow through permeable geotextiles and sewage interception baskets. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is a top view of an embodiment of the present application; Figure 2 yes Figure 1 Schematic diagram of the cross section at AA in the middle; Figure 3 It is a schematic diagram of the structure of the water collection well and the water storage well in the embodiment of the present application; Figure 4 It is a schematic diagram of the explosion structure of the water storage well, the sewage interception basket and the adjustment member in the embodiment of the present application; Figure 5 is a cross-sectional view of a water storage well in an embodiment of the present application; Figure 6 It is a structural schematic diagram of a dirt interception basket in an embodiment of the present application; Figure 7 It is a schematic diagram of the exploded structure of the dirt intercepting basket in the embodiment of the present application; Figure 8 yes Figure 7 Schematic diagram of the enlarged structure at point B in the middle.
[0026] Explanation of the reference numerals: 1. retaining wall; 2. water collecting well; 3. water permeable hole; 4. water storage well; 5. pumping device; 51. first pumping pipe; 52. second pumping pipe; 53. first pumping pump; 6. water intake device; 61. water intake pipe; 62. second pumping pump; 7. water through hole; 8. adjusting member; 81. connecting section; 82. water retaining section; 9. connecting hole; 10. permeable geotextile; 11. stroke part; 12. stroke groove; 13. sewage intercepting basket; 131. basket body; 1311. bottom plate; 1312. side plate; 1313. limit frame; 132. filter cloth; 14. driving assembly; 141. traction rope; 142. winding power source; 15. sewage intercepting chamber; 16. embedded groove; 17. fastener; 18. groundwater layer; 19. outer edge; 20. pressure cover. DETAILED DESCRIPTION
[0027] The following is combined with Figure 1-8 This application is described in further detail.
[0028] The present application embodiment discloses a deep water level foundation pit dewatering construction structure. Figure 1 The deep water level foundation pit dewatering construction structure includes a retaining wall 1, a water collection well 2, a water storage well 4, a pumping device 5 and a water intake device 6.
[0029] Reference Figure 2 and Figure 3 The retaining wall 1 surrounds the foundation pit and extends downward from the foundation surface to below the groundwater layer 18, so as to cut off the groundwater communication path on both sides of the retaining wall 1. The water collection well 2 is arranged on the bottom wall of the foundation pit and extends downward relative to the bottom wall of the foundation pit, and the water collection well 2 is provided with water permeable holes 3 in an array on the wall of the water collection well 2, so that during the excavation of the foundation pit, the groundwater in the foundation will first flow into the water collection well 2 through the water permeable holes 3, and the accumulated water in the water collection well 2 can be extracted to extract the groundwater within the enclosure of the retaining wall 1, thereby dewatering the foundation pit.
[0030] The water storage well 4 is arranged outside the foundation pit and corresponds to the water collection well 2 one by one, and the water storage well 4 is located outside the retaining wall 1. The water storage well 4 extends downward from the foundation surface, and the bottom of the water storage well 4 is sealed. At the same time, the inner bottom wall of the water storage well 4 is lower than the inner bottom wall of the water collection well 2 when the bottom of the foundation pit reaches the design benchmark. In this embodiment, the water collection well 2 has four water collection wells 2 respectively arranged at the four corners of the foundation pit, and the water storage well 4 corresponds to the water collection well 2 one by one.
[0031] Reference Figure 2 and Figure 3 The pumping device 5 is matched between the relative water collection well 2 and the water storage well 4, and includes a first pumping pipe 51, a second pumping pipe 52 and a first pumping pump 53. The first pumping pump 53 is installed on the foundation surface, one end of the first pumping pipe 51 is installed at the water inlet end of the first pumping pump 53, and the other end of the first pumping pipe 51 extends downward into the water collection well 2 and close to the bottom of the water collection well 2. One end of the second pumping pipe 52 is installed at the water outlet end of the first pumping pump 53, and the other end of the second pumping pipe 52 extends into the water storage well 4, and the second pumping pipe 52 is a hose. The accumulated water in the water collection well 2 is pumped to the water storage well 4 for storage by the first pumping pump 53.
[0032] The water intake device 6 includes a water intake pipe 61 and a second water pump 62. The water intake pipe 61 is a pipe made of hard material and is formed by splicing multiple sections of pipes. The bottom end of the water intake pipe 61 is passed from the outside of the water storage well 4 to the inside of the water storage well 4, and the water intake pipe 61 is close to the bottom of the water storage well 4. The top end of the water intake pipe 61 extends upward out of the foundation and is connected to the water inlet end of the second water pump 62. The second water pump 62 is installed on the foundation, and the water outlet end of the second water pump 62 is connected to the non-domestic water pipeline of the construction site. Therefore, when the construction site uses water for concrete mixing, dust reduction, etc., it can extract the water stored in the water storage well 4 for use.
[0033] Reference Figure 2 and Figure 4 Furthermore, water holes 7 are opened on the wall of the water well 4. The water holes 7 are gathered at the position where the water well 4 is relative to the groundwater in the foundation, and the water holes 7 are located below the groundwater level and close to the groundwater level. Water can flow between the water well 4 and the underground water layer 18 of the foundation through the water holes 7.
[0034] An adjusting member 8 is provided in the water storage well 4 at a position opposite to the water through hole 7, and the adjusting member 8 adjusts the connection of the water through hole 7. Specifically, the water storage well 4 is polygonal, and in this embodiment, the water storage well 4 is square, and the adjusting member 8 is an annular structure adapted to the water storage well 4, and in this embodiment, it is a square annular structure, and the outer periphery of the adjusting member 8 is in contact with the inner wall of the water storage well 4, and the adjusting member 8 is made of a material that can float on the water surface, such as foam plastics, air bags, etc.
[0035] Reference Figure 4 and Figure 5 The adjusting member 8 includes a connecting section 81 and a water retaining section 82 from top to bottom. The adjusting member 8 is provided with a plurality of connecting holes 9 on the connecting section 81. The connecting holes 9 penetrate the inner and outer sides of the adjusting member 8. The adjusting member 8 has a block-shaped travel portion 11 protruding outward on the outer wall of the water retaining section 82. A travel groove 12 for the travel portion 11 to slide up and down is provided on the inner wall of the water storage well 4, so as to guide the upward and downward movement of the adjusting member 8 in the water storage well 4 and limit the position.
[0036] When the stroke portion 11 abuts against the upper end of the stroke groove 12, the water retaining section 82 is opposite to the water hole 7. At this time, the connecting hole 9 is misaligned with the water hole 7, and the water retaining section 82 blocks the groundwater in the foundation from entering the water storage well 4 from the water hole 7; when the stroke portion 11 abuts against the lower end of the stroke groove 12, the connecting section 81 is opposite to the water hole 7. At this time, the connecting hole 9 is connected with the water hole 7, and the water storage well 4 and the underground water layer 18 of the foundation can exchange water flow through the connecting hole 9 and the water hole 7.
[0037] Among them, when the water level in the water storage well 4 is close to the water through hole 7 located at the bottom layer, the adjusting member 8 floats on the liquid surface of the water storage well 4, and the water retaining section 82 is opposite to all the water through holes 7. As the water level in the water storage well 4 gradually decreases, the adjusting member 8 moves downward with the liquid surface under the action of its own gravity, so that the water retaining section 82 gradually leaves the water through hole 7, and the connecting section 81 gradually becomes opposite to the water through hole 7, so that the water flow in the groundwater layer 18 can be replenished to the water collection well 2 through the water through hole 7 and the connecting hole 9 until the water level in the water storage well 4 moves up to the water retaining section 82 to block the water through hole 7 again.
[0038] When the amount of water transported from the water collecting well 2 to the water storage well 4 makes the liquid level in the water storage well 4 higher than the water through hole 7 located near the bottom layer, the adjusting member 8 tends to move upward due to the buoyancy of the water, and the adjusting member 8 is simultaneously limited by the stroke portion 11 so that the adjusting member 8 remains in the position where the water retaining section 82 blocks the water through hole 7, so that the liquid level in the water storage well 4 can gradually rise with the water transport so as to store water in the water storage well 4.
[0039] Reference Figure 3 and Figure 4 In addition, the water storage well 4 is covered with a permeable geotextile 10 on the outer wall with the water holes 7, so that the water flow is filtered by the permeable geotextile 10 before entering the water storage well 4 from the foundation, thereby improving the cleanliness of the water flow entering the water storage well 4 from the foundation.
[0040] Reference Figure 4Furthermore, a dirt interception basket 13 located above the adjusting member 8 is movable up and down in the water storage well 4, and a driving assembly 14 for adjusting the position of the dirt interception basket 13 is provided outside the water storage well 4. When intercepting dirt, the dirt interception basket 13 is located below the second water pumping pipe 52 and above the adjusting member 8 in the water storage well 4. When cleaning the dirt interception basket 13, the second water pumping pipe 52 is first moved out of the water storage well 4, and then the dirt interception basket 13 is moved up to the wellhead of the water storage well 4 to clean the dirt interception basket 13.
[0041] Reference Figure 4 and Figure 6 , wherein, for the sewage interception basket 13, the sewage interception basket 13 includes a basket body 131 and a filter cloth 132, the basket body 131 is made of a mesh hollow material, and the basket body 131 is in a square frame shape with an opening facing upward when in use, so as to form a sewage interception chamber 15. The filter cloth 132 is made of a water-permeable cloth, such as geotextile, gauze, etc., and the filter cloth 132 is detachably connected to the basket body 131, so that when the water flow enters the sewage interception basket 13, it is filtered on the filter cloth 132, and the filtered water flow passes through the filter cloth 132 and the basket body 131 in turn and enters the water storage well 4, while impurities such as gravel and gravel in the water flow remain on the filter cloth 132.
[0042] Reference Figure 7 , wherein the housing 131 includes a bottom plate 1311, a side plate 1312 and a limit frame 1313. The bottom plate 1311 is a structure whose size is consistent with the cross-sectional size of the inner cavity of the water storage well 4. In this embodiment, it is a square plate, and the bottom plate 1311 slides up and down in the water storage well 4. The number of side plates 1312 is consistent with the number of sides of the bottom plate 1311. Therefore, in this embodiment, there are four side plates 1312, and the four side plates 1312 are respectively hinged to the four sides of the bottom plate 1311 through pins. Among the four side plates 1312, the extension length of the side plates 1312 on the opposite sides of the bottom plate 1311 is consistent with the length of the side line of the opposite bottom plate 1311, and the side plates 1312 on the opposite ends of the bottom plate 1311 are abutted between the side plates 1312 on the opposite sides of the bottom plate 1311.
[0043] Reference Figure 7 and Figure 8 The four side panels 1312 are provided with an embedding groove 16 on the end surface away from the bottom panel 1311, and the embedding groove 16 passes through the opposite sides of the side panels 1312 along the horizontal length extension direction of the side panels 1312. When all the side panels 1312 are in a state where the plate surfaces are vertical, the bottom panel 1311 and the side panels 1312 together enclose the dirt intercepting basket 13 and can enter the water storage well 4. At the same time, the embedding grooves 16 on the four side panels 1312 are sequentially connected along the circumference of the bottom panel 1311, and the embedding grooves 16 together form a square frame shape.
[0044] Reference Figure 6 and Figure 8The limiting frame 1313 is in a square frame shape, the inner circle size of the square frame groove surrounded by the embedded groove 16 is smaller than the inner circle size of the limiting frame 1313, and the outer circle size of the square frame groove surrounded by the embedded groove 16 is larger than the outer circle size of the limiting frame 1313, so that the limiting frame 1313 can be pressed into the embedded groove 16. When assembling the housing 131, before putting the limiting frame 1313 into the embedded groove 16, first put the filter cloth 132 into the sewage interception cavity 15, and fold the edge of the filter cloth 132 to the top of the side plate 1312 and cover the embedded groove 16, and then insert the limiting frame 1313 into the embedded groove 16, so that the edge of the filter cloth 132 is pressed into and pressed tightly into the embedded groove 16 through the limiting frame 1313.
[0045] Reference Figure 7 and Figure 8 In addition, the limiting frame 1313 has an outer edge 19 on its periphery. When the limiting frame 1313 is inserted into the embedding groove 16, the outer edge 19 abuts against the top surface of the side plate 1312, and the outer edge 19 can be locked to the side plate 1312 by the fastener 17. Specifically, the fastener 17 is a part with a threaded column, which is a bolt in this embodiment. The outer edge 19 is provided with a through hole for the bolt rod to pass through, and the top surface of the side plate 1312 away from the bottom plate 1311 is provided with a threaded groove for the bolt to be threadedly connected.
[0046] Reference Figure 4 and Figure 7 As for the driving assembly 14, the driving assembly 14 includes a traction rope 141 and a winding power source 142. The traction rope 141 corresponds to the winding power source 142 one by one, and the traction rope 141 corresponds to the side plate 1312 one by one. The winding power source 142 is a winch, and the winding power source 142 is installed on the foundation surface. One end of the traction rope 141 is fixedly connected to the end of the corresponding side plate 1312 away from the bottom plate 1311, and the other end of the traction rope 141 is wound on the winding power source 142.
[0047] After the waste interception basket 13 is lowered into the water storage well 4, when all the winding power sources 142 corresponding to the waste interception basket 13 wind up the traction rope 141 together, the traction rope 141 pulls the waste interception basket 13 to move upward in the water storage well 4. When all the winding power sources 142 corresponding to the waste interception basket 13 unwind the traction rope 141 together, the waste interception basket 13 moves downward in the water storage well 4 under the action of its own gravity.
[0048] Reference Figure 2 , Figure 6 and Figure 7When cleaning the dirt intercepting basket 13, first pull the dirt intercepting basket 13 to the top of the side plate 1312 near the wellhead, then keep the winding power source 142 pulling the side plates 1312 on both sides of the bottom plate 1311, and remove the limit frame 1313 from the side plates 1312, and then alternately unwind the side plates 1312 at both ends of the bottom plate 1311, so that the side plates 1312 rotate inwards under their own gravity to press down the impurities in the filter cloth 132 through the filter cloth 132, and squeeze out part of the water in the impurities, thereby improving the dryness of the impurities in the filter cloth 132 and reducing the weight of the impurities, so as to improve the convenience of transporting the impurities. After the water in the impurities is squeezed out, the filter cloth 132 is taken out in the form of enclosing the impurities, and a new filter cloth 132 is replaced.
[0049] In addition, when the waste interception basket 13 is immersed in water, the gravity of the waste interception basket 13 is greater than the buoyancy of water. When the liquid level in the water storage well 4 is higher than the groundwater level and the liquid level in the water storage well 4 is too high, the waste interception basket 13 is lowered to press down the adjustment member 8. The waste interception basket 13 can press down the adjustment member 8 immersed in water to the connecting section 81 opposite to the water through hole 7 by its own gravity. Thus, the water in the water storage well 4 can flow into the groundwater layer 18 through the connecting hole 9 and the water through hole 7, realizing the drop of the water level in the water storage well 4. Since the water storage well 4 and the foundation pit are isolated by the retaining wall 1, the water flowing out of the water storage well 4 will not flow back into the foundation pit.
[0050] Reference Figure 3 What's more, in order to reduce the large particles of impurities in the foundation pit from entering the water collection well 2, the top of the water collection well 2 is covered with a pressure cover 20, which is in a grid hollow shape and is composed of two detachable halves. The first pumping pipe 51 extending into the water collection well 2 is located at the joint of the two halves of the pressure cover 20 of the water collection well 2, so that there is no need to adjust the position of the first pumping pipe 51 when the pressure cover 20 is disassembled. In addition, the water storage well 4 and the water collection well 2 are prefabricated components, and the water storage well 4 and the water collection well 2 can be formed by splicing multiple sections, and the adjacent two ends are connected by bolts to facilitate transportation and reuse in designs of different sizes.
[0051] The implementation principle of a deep water level foundation pit dewatering construction structure in an embodiment of the present application is: the accumulated water in the water collection well 2 is pumped to the water storage well 4 by a first pumping pump 53 to be accumulated in the water storage well 4, and the second pumping pump 62 pumps the water in the water storage well 4 for non-domestic use, and the water pumped by the second pumping pump 62 is filtered through the permeable geotextile 10 or the sewage interception basket 13.
[0052] The present application also discloses a construction method for a deep water level foundation pit dewatering construction structure, comprising the following steps: Step 1: Construction of retaining wall 1: along the perimeter of the designed foundation pit, a deep trench is excavated under the condition of mud wall protection, and then a steel cage is suspended in the trench, and underwater concrete is poured using the conduit method to form a unit trench section. This is carried out section by section, and finally a continuous retaining wall 1 is built underground.
[0053] Step 2: Construction of the water storage well 4. Dig the water storage well 4 groove from the foundation surface downward according to the designed position and size, hang the prefabricated components of the water storage well 4 downward, connect the water intake pipe 61 to the water storage well 4, and then backfill with soil to fix the water storage well 4; then lower the sewage intercepting basket 13 into the water storage well 4 and fix the winding power source 142 to the foundation.
[0054] Step 3: Construction of water collection well 2: digging a water collection well 2 trench on the foundation surface and placing the prefabricated water collection well 2 components therein.
[0055] Step 4: Install the pumping device 5, connect the first pumping pipe 51, the first pumping pump 53 and the second pumping pipe 52 in sequence, and place the first pumping pipe 51 into the water collection well 2, and the second pumping pipe 52 into the water storage well 4, so as to transport the accumulated water in the water collection well 2 to the water storage well 4 by pumping.
[0056] Step 5: Excavation of foundation pit, excavating the foundation pit from the foundation surface downwards.
[0057] The installation of the water collecting well 2 and the excavation of the foundation pit are carried out alternately. When the foundation pit is excavated to a position close to the middle of the water collecting well 2, the water collecting well 2 is first dug deeper on the original foundation before the foundation pit is excavated.
[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A deep water level foundation pit dewatering construction structure, characterized in that: include: A retaining wall (1) surrounds the foundation pit to isolate groundwater flow on both sides of the foundation pit; A water collection well (2) extending downward from the bottom of the foundation pit, the well wall having water permeable holes (3) for connecting the inside and outside of the water collection well (2); A water storage well (4) extending downward from the foundation surface, with an inner bottom wall lower than the inner bottom wall of the water collection well (2), and located outside the retaining wall (1); A water pumping device (5) is arranged between the water collection well (2) and the water storage well (4) and is used to pump water from the water collection well (2) into the water storage well (4); as well as A water extraction device (6) is connected to the bottom end of the water storage well (4) and is used to extract water from the water storage well (4).
2. A deep water level foundation pit dewatering construction structure according to claim 1, characterized in that: A water hole (7) is provided on the wall of the water storage well (4), and the position of the water hole (7) is opposite to the position of the groundwater and close to the groundwater level; and an adjusting member (8) is movable in the water storage well (4), and a connecting hole (9) is provided on the adjusting member (8), and the adjusting member (8) can be movable to a position where the connecting hole (9) and the water hole (7) are opposite to or offset from each other; When the communicating hole (9) is opposite to the water through hole (7), water flows on both sides of the water storage well (4) are connected to the water through hole (7) through the communicating hole (9); when the communicating hole (9) is misaligned with the water through hole (7), the regulating member (8) blocks the communication path of water flows on both sides of the water storage well (4).
3. A deep water level foundation pit dewatering construction structure according to claim 2, characterized in that: The outer wall of the water storage well (4) at the water through hole (7) is covered with a permeable geotextile (10).
4. A deep water level foundation pit dewatering construction structure according to claim 2, characterized in that: The regulating member (8) is made of a material capable of floating on the water surface, and is in the shape of a ring with an outer wall that fits in with the inner wall of the water storage well (4), and the regulating member (8) moves up and down in the water collection well (2); the regulating member (8) comprises a connecting section (81) and a water retaining section (82) that are sequentially arranged from top to bottom, and the connecting hole (9) is arranged on the connecting section (81); When the liquid level in the water storage well (4) is lower than the water through hole (7), the regulating member (8) is driven to float to the connecting section (81) opposite to the water through hole (7), so that the connecting hole (9) is connected to the water through hole (7); when the liquid level in the water storage well (4) is higher than the water through hole (7), the regulating member (8) is driven to float to the water retaining section (82) opposite to the water through hole (7), so that the connecting hole (9) is misaligned with the water through hole (7).
5. A deep water level foundation pit dewatering construction structure according to claim 4, characterized in that: The water retaining section (82) is provided with a travel portion (11), and the wall of the water storage well (4) is provided with a travel groove (12) for the travel portion (11) to move up and down.
6. A deep water level foundation pit dewatering construction structure according to claim 4, characterized in that: A sewage interception basket (13) is provided in the water storage well (4) so as to move up and down, and a driving assembly (14) for driving the sewage interception basket (13) to move is provided outside the water storage well (4); the sewage interception basket (13) comprises a basket body (131) and a filter cloth (132); the basket body (131) is hollow and forms a sewage interception cavity (15) which opens upward; the filter cloth (132) is detachably connected to the basket body (131) so as to filter water flowing into the lower side of the sewage interception basket (13).
7. A deep water level foundation pit dewatering construction structure according to claim 6, characterized in that: The dirt intercepting basket (13) is located above the adjusting member (8); when the adjusting member (8) is immersed in water, the dirt intercepting basket (13) can use its own weight to press down the adjusting member (8) to drive the adjusting member (8) to move downward.
8. The deep water level foundation pit dewatering construction structure according to claim 6, characterized in that: The basket (131) comprises a bottom plate (1311), a side plate (1312) and a limit frame (1313); the size of the bottom plate (1311) is adapted to the cross-sectional size of the water storage well (4); there are a plurality of side plates (1312), the plurality of side plates (1312) are distributed along the circumference of the bottom plate (1311) and are hinged to the edge of the bottom plate (1311), and when the plate surface of the side plate (1312) rotates upward to be perpendicular to the plate surface of the bottom plate (1311), the plurality of side plates (1312) abut against each other in sequence along the circumference of the bottom plate (1311), and the sewage interception chamber (15) is formed in the space enclosed by the side plates (1312); The side plate (1312) has an embedding groove (16) on one end surface away from the bottom plate (1311); when the side plate (1312) is perpendicular to the bottom plate (1311), the embedding grooves (16) on the side plate (1312) are interconnected; the limiting frame (1313) can be simultaneously inserted into the embedding grooves (16) of each of the side plates (1312) and locked with the side plates (1312) via fasteners (17); and the limiting frame (1313) can simultaneously press the peripheral side of the filter cloth (132) into the embedding groove (16).
9. A deep water level foundation pit dewatering construction structure according to claim 8, characterized in that: The driving assembly (14) comprises a traction rope (141) and a winding power source (142); the side plate (1312), the traction rope (141) and the winding power source (142) correspond to each other one by one; the winding power source (142) is located outside the water storage well (4); one end of the traction rope (141) is connected to the side plate (1312), and the other end of the traction rope (141) is wound on the winding power source (142); the winding power source (142) winds and unwinds the traction rope (141).
10. A construction method for a deep water level foundation pit dewatering construction structure, applicable to any one of claims 1 to 9 above, characterized in that: The following steps are involved: Construction of a retaining wall (1): excavating and pouring the retaining wall (1) around the foundation pit; The water storage well (4) is constructed by digging from the foundation surface downwards and placing the prefabricated water storage well (4) therein, while cooperating the water intake device (6) with the water storage well (4), and then backfilling the soil to fix the water storage well (4); Construction of the water collection well (2), excavation on the foundation surface and placing the prefabricated water collection well (2) therein; The pumping device (5) is installed between the water storage well (4) and the water collection well (2) and the accumulated water in the water collection well (2) is pumped into the water storage well (4); Foundation pit excavation: digging the foundation pit downward from the foundation surface.