A construction device and construction method for dewatering in deep foundation pits

Abstract

The present invention discloses a construction device and a construction method for dewatering of deep foundation pits, relating to the technical field of dewatering of deep foundation pits. The construction device includes a number of groups of dewatering wells opened on both sides of the foundation pit; a filtering module is evenly arranged in each dewatering well, and the filtering module is used for filtering and collecting the sand and gravel in the dewatering well. The filtering module is connected to a pumping module, and the pumping module is used for pumping the filtered water out of the dewatering well. When pumping water from the dewatering well, the present invention first filters and collects the sand and gravel through the filtering module, and then pumps the filtered water out of the dewatering well through the pumping module. Compared with the prior art, the present invention can collect the sand and gravel while filtering the sand and gravel, so as to avoid adsorbing the sand and gravel again when the pumping module pumps water, and achieve the effect of effectively isolating the sand and gravel.

Description

Technical Field

[0001] The present invention relates to the technical field of deep foundation pit dewatering, and particularly relates to a construction device and a construction method for deep foundation pit dewatering. Background Art

[0002] The foundation pit pipe well combined with the light well point dewatering system is a comprehensive dewatering scheme. It uses two different types of well structures to effectively control the groundwater level inside and outside the foundation pit. During construction, generally, multiple light well points are arranged on the periphery of the foundation pit. First, the outer pipe is inserted into the ground, and gravel is filled on the periphery of the outer pipe. Generally, many holes are arranged on the outer pipe, so that the groundwater in the soil enters the outer pipe. After the water level rises, the groundwater is pumped through the inner pipe arranged in the outer pipe. Since there are more sand and gravel near the shallow groundwater layer, the groundwater entering the outer pipe will have a large amount of sand and gravel. When the water pump pumps the groundwater through the inner pipe, the sand and gravel entering the water pump will cause damage to the water pump. Therefore, generally, a filter screen is arranged at the bottom of the inner pipe. However, the filter screen is extremely easy to be blocked by sand and gravel, resulting in the ineffective continuous dewatering and the need to regularly clean the filter screen manually.

[0003] In the prior art, a patent document with the publication number of CN118774156B discloses a dewatering structure and a drainage method for a foundation pit of a water conservancy project by combining pipe wells and light well points, and also discloses filtering sand and gravel through a first filter screen. After the first filter screen is blocked, the first filter screen is driven to move by a control component, so that the volume of the blocking cavity is changed, and the first filter screen is self-cleaned by squeezing the water flow.

[0004] In actual application, although the prior art can clean the sand and gravel attached to the filter screen through the self-cleaning method, since the water pump operates normally and continuously generates negative pressure, the sand and gravel separated from the filter screen are easily adsorbed on the filter screen again. The prior art cannot effectively isolate these sand and gravel. When the accumulation amount of sand and gravel is too much, it will affect the normal water intake of the outer pipe. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction device and a construction method for deep foundation pit dewatering to solve the following technical problems:

[0006] After the prior art cleans the sand and gravel on the filter screen through the self-cleaning method, these sand and gravel will be adsorbed on the filter screen again under the continuous negative pressure of the water pump, and complete cleaning cannot be achieved.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A construction device for deep foundation pit dewatering includes several groups of dewatering wells opened on both sides of the foundation pit;

[0009] A filter module is evenly arranged in each precipitation well. The filter module includes a filter column. A plurality of groups of sedimentation chambers are circumferentially arrayed on the filter column. A scraper for scraping sand and gravel is arranged in the sedimentation chamber. A drainage chamber is opened at the bottom of the filter column;

[0010] The filter module is connected to a pumping module. The pumping module includes a drain pipe fixedly arranged in the drainage chamber for pumping the filtered water out of the precipitation well.

[0011] Preferably, a water inlet is opened on the sedimentation chamber. A first sealing plate is arranged on the water inlet. The first sealing plate is connected to a first lifting part. A water outlet is opened at the bottom of the sedimentation chamber. A second sealing plate is arranged at the water outlet. The second sealing plate is connected to a second lifting part;

[0012] Among them, the drainage chamber is communicated with the sedimentation chamber through the water outlet.

[0013] Preferably, a limiting frame corresponding to the sedimentation chamber is fixedly arranged on the outer edge surface of the filter column. A discharge groove communicated with the sedimentation chamber is opened at the bottom of the limiting frame. A baffle is slidably embedded in the discharge groove. The baffle is connected to a first elastic part arranged on the groove wall of the discharge groove. The baffle is slidably attached to the groove wall of the discharge groove;

[0014] Among them, a groove is opened on one side of the sedimentation chamber facing the axis of the filter column. A scraper is slidably embedded in the groove. The scraper is slidably attached to the groove wall of the groove and the second sealing plate. A top plate is vertically fixedly arranged at the top end of the scraper. A pushing part is arranged in the filter column for driving the scraper to slide in the sedimentation chamber.

[0015] Preferably, a storage box is fixedly arranged at the bottom end of the limiting frame. A feeding port is opened at the top of the storage box. A third sealing plate is slidably arranged on the feeding port. Limiting rods slidably inserted into the limiting frame are respectively fixedly arranged at both ends of the third sealing plate. A first spring is arranged on the limiting rod.

[0016] Preferably, sliding grooves are opened on both side walls of the discharge groove. A guide groove is further opened on one side of the sliding groove facing the baffle. A through groove is opened on one side of the guide groove facing the baffle. A guide plate is slidably arranged in the sliding groove and the guide groove. The guide plate is fixed to the baffle through a connecting plate passing through the through groove;

[0017] Among them, a sleeve is fixedly arranged in the sliding groove. A second spring is fixedly arranged in the sleeve. The other end of the second spring is fixed to the guide plate through a telescopic rod.

[0018] Preferably, a partition plate fixed to the guide plate is slidably arranged in the guide groove. The partition plate is located on one side of the guide plate facing the sleeve;

[0019] Among them, the partition plate is slidably attached to the groove wall of the guide groove.

[0020] Preferably, reserved grooves are provided at corresponding positions on the groove and the discharge chute. The pushing part includes screws rotatably arranged in the reserved grooves on both sides. Nuts fixed to the top plate are helically sleeved on the screws.

[0021] One end of each screw extends into the circular groove, and a gear is fixedly arranged at the end of the screw. A rack for meshing with the gear is fixedly arranged on the outer side of the water delivery pipe correspondingly.

[0022] Preferably, a plurality of groups of hydrophobic holes are circumferentially arrayed at the bottom of the drain pipe.

[0023] A circular groove is provided at the axial center end of the filter column. A water delivery pipe slidably inserted into the drain pipe is arranged at the axial center end of the circular groove. Main water pipes are respectively arranged on both sides of the foundation pit. One end of the water delivery pipe away from the filter column is slidably inserted into the branch water pipe respectively. Each branch water pipe is communicated with the main water pipe. Water pumps are also arranged on both sides of the foundation pit. The water pumps are connected with the main water pipe.

[0024] Preferably, each first sealing plate is fixed to the first positioning ring through an L-shaped bracket respectively. Each second sealing plate is fixed to the second positioning ring respectively. The first lifting part includes a first push plate fixedly arranged on the water delivery pipe. The second lifting part includes a second push plate fixedly arranged on the water delivery pipe. A second elastic part is arranged on the filter column. The first sealing plate and the second sealing plate are respectively connected with the second elastic part.

[0025] The tops of the water delivery pipes are fixed by a connecting frame. Lifting cylinders are respectively arranged on both sides of the foundation pit. The driving ends of the lifting cylinders are fixed to the connecting frame.

[0026] A construction method for dewatering of deep foundation pits, using the above-mentioned construction device for dewatering of deep foundation pits, includes the following steps:

[0027] A plurality of dewatering wells are arranged around the foundation pit.

[0028] The filter column is placed in the dewatering well. At the same time, the water delivery pipe is connected with the water pump through the branch water pipe and the main water pipe.

[0029] The lifting cylinder drives the water delivery pipe to rise. The water delivery pipe drives the first positioning ring to rise through the first push plate. The first positioning ring can drive the first sealing plate to separate from the water inlet through the L-shaped bracket. The water in the dewatering well enters the sedimentation cavity.

[0030] After the water inlet is completed, the lifting cylinder drives the water delivery pipe to descend a certain distance. The second elastic part drives the first sealing plate to reset and seal the water inlet under the action of elastic force.

[0031] The sand and gravel deposited at the bottom of the sedimentation cavity are scraped off by a scraper.

[0032] The lifting cylinder drives the water delivery pipe to descend further. During the descent of the water delivery pipe, the second positioning ring is pushed down a certain distance by the second push plate. The second positioning ring drives the second sealing plate to separate from the water outlet, and the water in the sedimentation chamber is discharged into the drainage chamber.

[0033] Start the water pump. The water pump pumps out the water in the drainage pipe through the water delivery pipe, the branch water pipe, and the main water pipe in sequence.

[0034] Advantages of the present invention:

[0035] (1) When pumping water from the precipitation well, the present invention first filters and collects the sand and gravel through the filtration module, and then pumps out the filtered water from the precipitation well through the pumping module. Compared with the prior art, the present invention can collect the sand and gravel while filtering the sand and gravel, so as to avoid the pumping module adsorbing the sand and gravel again when pumping water, and achieve the effect of effectively isolating the sand and gravel;

[0036] (2) In the present invention, when the water in the sedimentation chamber is full, the water inlet is closed by the first sealing plate, and the water outlet is closed by the second sealing plate. After sedimentation for a period of time, the sand and gravel contained in the water will sediment on the second sealing plate under the action of gravity. The present invention can drive the scraper to move away from the axis of the filter column through the pushing part. During the movement, the scraper scrapes the sand and gravel deposited on the second sealing plate towards the baffle. As the scraper moves, the baffle can be synchronously pushed towards the outside of the discharge chute, and then the sand and gravel between the baffle and the scraper are scraped out. At this time, the first elastic part stretches to generate an elastic force. Since both the baffle and the scraper are in sliding fit with the wall of the discharge chute, the water in the sedimentation chamber will not leak from the gaps between the baffle, the scraper and the discharge chute during the scraping process. After the discharging is completed, the scraper is driven to reset by the pushing part, and the first elastic part can synchronously drive the baffle to reset, so as to facilitate scraping again. Description of the drawings

[0037] The present invention will be further described below with reference to the drawings.

[0038] Figure 1 is the construction structure schematic diagram of a construction device for deep foundation pit dewatering of the present invention;

[0039] Figure 2 is the construction sectional structure schematic diagram of a construction device for deep foundation pit dewatering of the present invention;

[0040] Figure 3 is the structure schematic diagram of the filter column in a construction device for deep foundation pit dewatering of the present invention;

[0041] Figure 4 is the structure schematic diagram of the storage box in a construction device for deep foundation pit dewatering of the present invention;

[0042] Figure 5 It is a schematic cross-sectional view of a filter column in a construction device for dewatering deep foundation pits according to the present invention;

[0043] Figure 6 It is the present invention Figure 5 A schematic structural view of the enlarged part at A;

[0044] Figure 7 It is a schematic structural view of a chute in a construction device for dewatering deep foundation pits according to the present invention;

[0045] Figure 8 It is the present invention Figure 7 A schematic structural view of the enlarged part at B;

[0046] Figure 9 It is a schematic structural view of a baffle in a construction device for dewatering deep foundation pits according to the present invention;

[0047] Figure 10 It is a schematic structural view when the water inlet of a construction device for dewatering deep foundation pits according to the present invention is opened;

[0048] Figure 11 It is a schematic structural view when the sedimentation chamber stores water in a construction device for dewatering deep foundation pits according to the present invention;

[0049] Figure 12 It is a schematic structural view when a scraper scrapes materials in a construction device for dewatering deep foundation pits according to the present invention;

[0050] Figure 13 It is a schematic structural view when the water outlet of a construction device for dewatering deep foundation pits according to the present invention is opened;

[0051] Figure 14 It is a schematic structural view of a water delivery pipe in a construction device for dewatering deep foundation pits according to the present invention.

[0052] In the figure: 1, foundation pit; 2, water pump; 3, filtering module; 4, storage bin; 5, first sealing plate; 6, sedimentation chamber; 7, baffle; 101, dewatering well; 201, main water pipe; 202, branch water pipe; 203, connecting frame; 204, lifting cylinder; 205, water delivery pipe; 301, filter column; 302, limiting frame; 303, discharge chute; 304, sliding chute; 305, round groove; 306, drainage cavity; 307, drain pipe; 308, hydrophobic hole; 401, cover plate; 402, third sealing plate; 403, limiting rod; 404, first spring; 405, feed inlet; 406, drain hole; 501, guide seat; 502, guide rod; 503, third spring; 504, L-shaped bracket; 505, first positioning ring; 506, first push plate; 507, second push plate; 508, rack; 509, second positioning ring; 601, water inlet; 602, water outlet; 603, second sealing plate; 604, groove; 605, scraper; 606, top plate; 607, reserved groove; 608, screw; 609, nut; 610, gear; 701, baffle plate; 702, guide groove; 703, through groove; 704, partition plate; 705, guide plate; 706, sleeve; 707, telescopic rod; 708, second spring. Detailed implementation mode

[0053] 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 work shall fall within the protection scope of the present invention.

[0054] Embodiment 1

[0055] Please refer to Figures 1 - 2 As shown, the present invention is a construction device for dewatering deep foundation pits, including a number of dewatering wells 101 opened on both sides of the foundation pit 1; specifically, each group of dewatering wells 101 is arranged at intervals on both sides of the foundation pit 1, and the spacing between two adjacent dewatering wells 101 is set accordingly based on the dewatering requirements. Among them, the depth of the dewatering well 101 is higher than the depth of the foundation pit 1 to ensure that groundwater can effectively penetrate and gather in the dewatering well 101 under the action of gravity. During dewatering, it is ensured that the groundwater level line in the dewatering well 101 is always lower than the horizontal line at the bottom of the foundation pit 1, thereby avoiding the problem of groundwater seeping into the foundation pit 1.

[0056] In this embodiment, a filter module 3 is evenly arranged in each precipitation well 101. The filter module 3 is used to filter and collect the sand and gravel in the precipitation well 101. The filter module 3 includes a filter column 301. A plurality of groups of sedimentation cavities 6 are circumferentially arrayed on the filter column 301. A scraper 605 for scraping sand and gravel is arranged in the sedimentation cavity 6. A drainage cavity 306 is opened at the bottom of the filter column 301; the filter module 3 is connected to a pumping module. The pumping module is used to pump the filtered water out of the precipitation well 101. The pumping module includes a drain pipe 307 fixedly arranged in the drainage cavity 306 for pumping the filtered water out of the precipitation well 101;

[0057] It should be noted that when pumping water from the precipitation well 101 in this embodiment, first, the filter module 3 filters and collects the sand and gravel, and second, the pumping module pumps the filtered water out of the precipitation well 101. Compared with the prior art, this embodiment can collect the sand and gravel while filtering the sand and gravel, so as to avoid adsorbing the sand and gravel again when the pumping module pumps water, and achieve the effect of effectively isolating the sand and gravel.

[0058] Embodiment 2

[0059] On the basis of Embodiment 1, please refer to Figure 3 and Figure 5 , an inlet 601 is opened on the sedimentation cavity 6. A first sealing plate 5 is arranged on the inlet 601. The first sealing plate 5 is connected to a first lifting part for adjusting the opening or closing of the inlet 601. An outlet 602 is opened at the bottom of the sedimentation cavity 6. A second sealing plate 603 is arranged at the outlet 602. The second sealing plate 603 is connected to a second lifting part for adjusting the opening or closing of the outlet 602. Among them, the drainage cavity 306 is communicated with the sedimentation cavity 6 through the outlet 602; it can be explained that in the initial state, the first lifting part adjusts the first sealing plate 5 to close the inlet 601, and the second lifting part adjusts the second sealing plate 603 to close the outlet 602. When pumping water, the first lifting part adjusts the first sealing plate 5 to rise and separate from the inlet 601 (please refer to Figure 10 ), at this time, the water in the precipitation well 101 can enter the sedimentation cavity 6 through the inlet 601 under the action of gravity. When the water in the sedimentation cavity 6 is full, the first lifting part adjusts the first sealing plate 5 to reset and close the inlet 601 (please refer to Figure 11 ), secondly, the second lifting part adjusts the second sealing plate 603 to descend and separate from the outlet 602, and the water in the sedimentation cavity 6 can be discharged into the drainage cavity 306 through the outlet 602 under the action of gravity, and finally be pumped out by the pumping module. In this way, the effect of continuous pumping can be achieved.

[0060] In addition, in this embodiment, three groups of deposition chambers 6 are arranged in a circumferential array. The specific number of arrangements in this embodiment is not limited, as long as the actual water pumping requirement is met.

[0061] In this embodiment, reference can be made to Figures 5 - 6 , and a limiting frame 302 corresponding to the deposition chamber 6 one by one is fixedly arranged on the outer edge surface of the filter column 301. A discharge groove 303 communicating with the deposition chamber 6 is opened at the bottom of the limiting frame 302. A baffle 7 is slidably embedded in the discharge groove 303. The baffle 7 is connected to a first elastic part arranged in the groove wall of the discharge groove 303. The baffle 7 is slidably attached to the groove wall of the discharge groove 303. Among them, a groove 604 is opened on one side of the deposition chamber 6 facing the axis direction of the filter column 301. A scraper 605 is slidably embedded in the groove 604. The scraper 605 is slidably attached to the groove wall of the groove 604 and the second sealing plate 603. A pushing part is arranged in the filter column 301, and the pushing part is used to drive the scraper 605 to slide in the deposition chamber 6; it can be explained that, please refer to Figures 11 - 12 , when the water in the deposition chamber 6 is full, the water inlet 601 is closed by the first sealing plate 5, and the water outlet 602 is closed by the second sealing plate 603. After deposition for a period of time, the sand and gravel contained in the water will be deposited on the second sealing plate 603 under the action of gravity. In this embodiment, the pushing part can be used to drive the scraper 605 to move in a direction away from the axis of the filter column 301. During the movement, the scraper 605 scrapes the sand and gravel deposited on the second sealing plate 603 in the direction of the baffle 7. As the scraper 605 moves, the baffle 7 can be synchronously pushed to move towards the outside of the discharge groove 303, and then the sand and gravel between the baffle 7 and the scraper 605 are scraped out (please refer to Figure 12 ). At this time, the first elastic part is stretched to generate an elastic force. Since both the baffle 7 and the scraper 605 are slidably attached to the groove wall of the discharge groove 303, the water in the deposition chamber 6 will not leak from the gaps between the baffle 7 and the scraper 605 and the discharge groove 303 during the scraping process. After the discharging is completed, the pushing part is used to drive the scraper 605 to reset, and the first elastic part can synchronously drive the baffle 7 to reset, so as to facilitate scraping again.

[0062] As a further solution of this embodiment, please refer to Figures 4 - 5, a storage bin 4 is fixedly arranged at the bottom end of the limit frame 302. A feed inlet 405 is opened at the top of the storage bin 4. A third sealing plate 402 is slidably arranged on the feed inlet 405. Limit rods 403 slidably inserted into the limit frame 302 are fixedly arranged at both ends of the third sealing plate 402. A first spring 404 is arranged on the limit rod 403; specifically, one end of the first spring 404 is fixed to the limit frame 302, and the other end is fixed to both sides of the third sealing plate 402; it can be explained that during the process of the scraper 605 synchronously driving the baffle 7 to move away from the axis of the filter column 301, the baffle 7 can synchronously push the third sealing plate 402 to deflect away from the axis, so that the feed inlet 405 is opened. The sand and gravel scraped by the scraper 605 can fall into the storage bin 4 through the feed inlet 405 under the action of gravity for collection. At this time, the first spring 404 is stretched to generate an elastic force. When the scraper 605 resets, the first spring 404 can drive the third sealing plate 402 to reset synchronously.

[0063] In addition, reference can be made to Figure 4 , a cover plate 401 is embedded on one side of the storage bin 4 away from the axis of the filter column 301. The cover plate 401 is fixed to the storage bin 4 by bolts; specifically, the particle size of the sand and gravel particles that can be adsorbed is usually small. Therefore, the volume of the storage bin 4 can meet the collection of sand and gravel during one pumping process. After the pumping is completed, when the filter module 3 is taken out of the precipitation well 101, the cover plate 401 can be opened to take out the sand and gravel stored in the storage bin 4, and the operation is very convenient.

[0064] Reference can be made to Figure 11 , during scraping, some water will also enter the storage bin 4. In order to drain the water in the storage bin 4, in this embodiment, at least one group of drain holes 406 communicating with the drain cavity 306 is opened on one side of the storage bin 4 close to the axis of the filter column 301. A one-way valve limited to drain water into the drain cavity 306 is arranged in the drain hole 406; specifically, there must be a certain height difference between the bottom of the drain hole 406 and the drain cavity 306. When a certain amount of water in the drain cavity 306 is pumped out and the water level in the storage bin 4 is relatively high, the water in the storage bin 4 can be drained into the drain cavity 306 through the drain hole 406.

[0065] Please refer to Figure 6 , a top plate 606 is vertically and fixedly arranged at the top end of the scraper 605; specifically, when the scraper 605 moves towards the baffle 7, the top plate 606 first abuts against the baffle 7, and then a scraping cavity for scraping materials can be formed among the scraper 605, the baffle 7 and the top plate 606. The sand and gravel can be temporarily stored in the scraping cavity to avoid the phenomenon that the clamping force of the scraper 605 and the baffle 7 on the sand and gravel is too large and affects the normal discharging of the sand and gravel.

[0066] In this embodiment, reference can be made to Figure 3 , Figures 7 - 9, chute grooves 304 are provided on both side walls of the discharge chute 303. Guide grooves 702 are further provided on one side of the chute grooves 304 close to the baffle 7. Through grooves 703 are provided on one side of the guide grooves 702 close to the baffle 7. A guide plate 705 is slidably arranged in the chute grooves 304 and the guide grooves 702. The guide plate 705 is fixed to the baffle 7 through a connecting plate passing through the through groove 703. Among them, a sleeve 706 is fixedly arranged in the chute grooves 304, a second spring 708 is fixedly arranged in the sleeve 706, and the other end of the second spring 708 is fixed to the guide plate 705 through a telescopic rod 707. It can be explained that during the sliding process of the baffle 7, the guide plate 705 can be driven by the connecting plate to slide in the chute grooves 304 and the guide grooves 702. The guide plate 705 drives the second spring 708 to stretch and generate elastic force through the telescopic rod 707, so as to facilitate the subsequent reset of the guide plate 705 and the baffle 7.

[0067] As a further solution of this embodiment, in order to prevent water from being discharged from the through groove 703 into the guide groove 702 and the chute groove 304 as the baffle 7 moves, a partition plate 704 fixed to the guide plate 705 is slidably arranged in the guide groove 702. The partition plate 704 is located on one side of the guide plate 705 close to the sleeve 706. Among them, the partition plate 704 is slidably attached to the groove wall of the guide groove 702. It can be explained that during the sliding process of the baffle 7, the partition plate 704 can be synchronously driven to slide in the guide groove 702, so as to realize the sealing of the through groove 703, so that water will not enter the guide groove 702 along the through groove 703, effectively improving the sealing performance.

[0068] Please refer to Figure 3 , Figures 5 - 6 , in this embodiment, reserved grooves 607 are provided at corresponding positions on the groove 604 and the discharge chute 303. The pushing part includes screws 608 rotatably arranged in the reserved grooves 607 on both sides. Nuts 609 fixed to the top plate 606 are spirally sleeved on the screws 608. It can be explained that when driving the scraper 605 to move, first rotate the screw 608, and when the nut 609 slides on the screw 608, the scraper 605 can be driven to slide through the top plate 606.

[0069] In addition, a shielding plate 701 is vertically and fixedly arranged at the top of the baffle 7 to close the reserved groove 607 at its top to prevent water in the sedimentation chamber 6 from leaking through the reserved groove 607.

[0070] Please refer to Figure 5 , a plurality of groups of hydrophobic holes 308 are circumferentially arrayed at the bottom of the drain pipe 307. Among them, a circular groove 305 is provided at the axial center end of the filter column 301, and a water delivery pipe 205 slidably inserted into the drain pipe 307 is arranged at the axial center end of the circular groove 305. Please refer to Figures 1 - 2, main water pipes 201 are respectively arranged on both sides of the foundation pit 1. The ends of the water delivery pipes 205 far away from the filter columns 301 are respectively slidably inserted into the branch water pipes 202, and each branch water pipe 202 is respectively communicated with the main water pipe 201. Water pumps 2 are also arranged on both sides of the foundation pit 1, and the water pumps 2 are connected to the main water pipe 201; it can be explained that after the water in the sedimentation chamber 6 is discharged into the drainage chamber 306, the water can enter the drain pipe 307 along the hydrophobic holes 308. Start the water pump 2, and the water pump 2 pumps out the water in the drain pipe 307 through the water delivery pipes 205, branch water pipes 202 and main water pipes 201 in sequence.

[0071] Please refer to Figure 3 and Figure 5 as well as Figure 14 , each first sealing plate 5 is respectively fixed to the first positioning ring 505 through the L-shaped bracket 504, each second sealing plate 603 is respectively fixed to the second positioning ring 509, the water delivery pipes 205 respectively slide through the first positioning ring 505 and the second positioning ring 509, the first lifting part includes the first push plate 506 fixedly arranged on the water delivery pipe 205, the second lifting part includes the second push plate 507 fixedly arranged on the water delivery pipe 205, the diameter of the first push plate 506 is larger than the inner diameter of the first positioning ring 505, the diameter of the second push plate 507 is larger than the inner diameter of the second positioning ring 509, and the filter column 301 is provided with a second elastic part, and the first sealing plate 5 and the second sealing plate 603 are respectively connected to the second elastic part; among them, please refer to Figures 1 - 2 , the tops of the water delivery pipes 205 are fixed by the connecting frames 203, lifting cylinders 204 are respectively arranged on both sides of the foundation pit 1, and the driving ends of the lifting cylinders 204 are fixed to the connecting frames 203;

[0072] It can be explained that in the initial state, based on the setting of the second elastic part, the first sealing plate 5 is in a state of sealing the water inlet 601, and the second sealing plate 603 is in a state of sealing the water outlet 602. When it is necessary to adjust the separation of the first sealing plate 5 from the water inlet 601, in this embodiment, the lifting cylinder 204 can be used to drive the water delivery pipe 205 to rise. The water delivery pipe 205 can drive the first positioning ring 505 to rise through the first push plate 506, and the first positioning ring 505 can drive the first sealing plate 5 to separate from the water inlet 601 through the L-shaped bracket 504. After the sedimentation chamber 6 is filled with water, the lifting cylinder 204 drives the water delivery pipe 205 to descend a certain distance, and the second elastic part can drive the first sealing plate 5 to reset and seal the water inlet 601 under the action of elastic force. After the scraper 605 completes the scraping of sand and gravel, the lifting cylinder 204 drives the water delivery pipe 205 to descend further. During the descent of the water delivery pipe 205, the second push plate 507 is used to push the second positioning ring 509 to descend a certain distance, and the second positioning ring 509 synchronously drives the second sealing plate 603 to separate from the water outlet 602 to drain the water in the sedimentation chamber 6. The lifting cylinder 204 drives the water delivery pipe 205 to reset, and the second elastic part can synchronously drive the second sealing plate 603 and the second positioning ring 509 to reset.

[0073] Please refer to Figure 3 Figure 3 , the second elastic part includes a guide rod 502 fixedly arranged on the filter column 301, and a guide seat 501 fixedly arranged on the first sealing plate 5 or the second sealing plate 603 is slidably arranged on the guide rod 502. Among them, a third spring 503 is arranged on the guide rod 502; specifically, one end of the third spring 503 is fixed to the guide seat 501, and the other end is fixed to the end of the guide rod 502; it can be explained that the first sealing plate 5 and the second sealing plate 603 in this embodiment can synchronously drive the guide seat 501 to slide on the guide rod 502 during movement, thereby compressing the third spring 503 to generate elastic force for driving the guide seat 501 to reset later.

[0074] Furthermore, please refer to Figure 5 and Figure 14 Figure 14 , in order to drive the screw rod 608 to rotate, in this embodiment, one end of each screw rod 608 extends into the circular groove 305, and a gear 610 is fixedly arranged at the end of the screw rod 608. Among them, a rack 508 for meshing with the gear 610 is fixedly arranged on the outer side of the water delivery pipe 205; it can be explained that when the sedimentation chamber 6 is filled with water and sedimented for a period of time so that the sand and gravel fall to the bottom of the sedimentation chamber 6, then the water delivery pipe 205 is driven to descend by the lifting cylinder 204. During the descending process, the rack 508 can automatically drive the screw rod 608 to rotate by meshing with the gear 610 until the scraping is completed. After that, the rack 508 and the gear 610 are disengaged. As the water delivery pipe 205 continues to descend, the second push plate 507 will abut against the second positioning ring 509. Correspondingly, as the water delivery pipe 205 ascends, the screw rod 608 is driven to rotate in the reverse direction by the rack 508 and the gear 610, thereby driving the scraper 605 to reset.

[0075] A construction method for dewatering deep foundation pits includes the following steps:

[0076] Please refer to Figures 1 - 2 Figures 1 - 2 , S1, arrange a plurality of dewatering wells 101 on the periphery of the foundation pit 1;

[0077] S2, place the filter column 301 in the dewatering well 101. At the same time, connect the water delivery pipe 205 to the water pump 2 through the branch water pipe 202 and the main water pipe 201;

[0078] Please refer to Figures 2 - 5 Figures 2 - 5 , S3, the lifting cylinder 204 drives the water delivery pipe 205 to rise. The water delivery pipe 205 drives the first positioning ring 505 to rise through the first push plate 506. The first positioning ring 505 can drive the first sealing plate 5 to separate from the water inlet 601 through the L-shaped bracket 504, and the water in the dewatering well 101 enters the sedimentation chamber 6 (please refer to Figure 10 ).

[0079] S4. After the water inlet is completed, the lifting cylinder 204 drives the water delivery pipe 205 to descend a certain distance, and the second elastic part drives the first sealing plate 5 to reset and seal the water inlet 601 under the action of elastic force (for reference, see Figure 11 );

[0080] S5. Use the scraper 605 to scrape off the sand and gravel deposited at the bottom of the sedimentation chamber 6 (for reference, see Figure 12 );

[0081] S6. The lifting cylinder 204 drives the water delivery pipe 205 to descend further. During the descent of the water delivery pipe 205, the second push plate 507 is used to push the second positioning ring 509 to descend a certain distance, and the second positioning ring 509 drives the second sealing plate 603 to separate from the water outlet 602, and the water in the sedimentation chamber 6 is discharged into the drainage chamber 306 (for reference, see Figure 13 );

[0082] S7. Start the water pump 2, and the water pump 2 pumps out the water in the drain pipe 307 through the water delivery pipe 205, the branch water pipe 202, and the main water pipe 201 in sequence.

[0083] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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, specific orientation structure and operation. Therefore, it should not be construed as a limitation of the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0084] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0085] The above has described a specific embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A construction device for dewatering in deep foundation pits, comprising a number of groups of precipitation wells (101) opened on both sides of the foundation pit (1); It is characterized in that In each precipitation well (101), a filtering module (3) is evenly arranged. The filtering module (3) includes a filter column (301). A number of groups of sedimentation cavities (6) are circumferentially arrayed on the filter column (301). A scraper (605) for scraping sand and gravel is arranged in the sedimentation cavity (6). A drainage cavity (306) is opened at the bottom of the filter column (301). The filtering module (3) is connected to a pumping module. The pumping module includes a drain pipe (307) fixedly arranged in the drainage cavity (306) for pumping out the filtered water from the precipitation well (101); An inlet (601) is opened on the sedimentation cavity (6). A first sealing plate (5) is arranged on the inlet (601). The first sealing plate (5) is connected to a first lifting part. An outlet (602) is opened at the bottom of the sedimentation cavity (6). A second sealing plate (603) is arranged at the outlet (602). The second sealing plate (603) is connected to a second lifting part; On the outer peripheral surface of the filter column (301), a limiting frame (302) corresponding to the sedimentation cavity (6) is fixedly arranged. A discharge chute (303) communicating with the sedimentation cavity (6) is opened at the bottom of the limiting frame (302). A baffle (7) is slidably embedded in the discharge chute (303). The baffle (7) is connected to a first elastic part arranged in the chute wall of the discharge chute (303). The baffle (7) is slidably fitted with the chute wall of the discharge chute (303); A groove (604) is opened on one side of the sedimentation cavity (6) facing the axis of the filter column (301). A scraper (605) is slidably embedded in the groove (604). The scraper (605) is slidably fitted with the groove wall of the groove (604) and the second sealing plate (603). A top plate (606) is vertically fixedly arranged at the top end of the scraper (605). A pushing part is arranged in the filter column (301) for driving the scraper (605) to slide in the sedimentation cavity (6). A storage box (4) is fixedly arranged at the bottom end of the limiting frame (302). A feeding port (405) is opened at the top of the storage box (4). A third sealing plate (402) is slidably arranged on the feeding port (405).

2. The construction device for deep foundation pit dewatering according to claim 1, wherein, The drainage cavity (306) communicates with the sedimentation cavity (6) through the outlet (602).

3. The construction device for dewatering of deep foundation pits according to claim 1, characterized in that, Limiting rods (403) slidably inserted into the limiting frame (302) are respectively fixedly arranged at both ends of the third sealing plate (402). A first spring (404) is arranged on the limiting rod (403).

4. A construction device for dewatering in deep foundation pits according to claim 1, characterized in that, Chutes (304) are opened on both chute walls of the discharge chute (303). A guide groove (702) is further opened on one side of the chute (304) facing the baffle (7). A through groove (703) is opened on one side of the guide groove (702) facing the baffle (7). A guide plate (705) is slidably arranged in the chute (304) and the guide groove (702). The guide plate (705) is fixed to the baffle (7) through a connecting plate passing through the through groove (703); Wherein, a sleeve (706) is fixedly arranged in the sliding groove (304), a second spring (708) is fixedly arranged in the sleeve (706), and the other end of the second spring (708) is fixed to the guide plate (705) through a telescopic rod (707).

5. The construction device for dewatering of deep foundation pits according to claim 4, characterized in that, A partition plate (704) fixed to the guide plate (705) is slidably arranged in the guide groove (702), and the partition plate (704) is located on the side of the guide plate (705) close to the sleeve (706); Wherein, the partition plate (704) is in sliding fit with the groove wall of the guide groove (702).

6. The construction device for deep foundation pit dewatering according to claim 1, characterized in that, Reserved grooves (607) are respectively opened at corresponding positions on the groove (604) and the discharge chute (303). The pushing part includes screws (608) rotatably arranged in the reserved grooves (607) on both sides, and nuts (609) fixed to the top plate (606) are helically sleeved on the screws (608); Wherein, one end of each screw (608) extends into the circular groove (305), and a gear (610) is fixedly arranged at the end of the screw (608); a rack (508) for meshing with the gear (610) is fixedly arranged on the outer side of the water delivery pipe (205).

7. The construction device for dewatering of deep foundation pit according to claim 6, characterized in that, A plurality of groups of hydrophobic holes (308) are circumferentially and arrayedly opened at the bottom of the drain pipe (307); Wherein, a circular groove (305) is opened at the axial center end of the filter column (301), a water delivery pipe (205) slidably inserted into the drain pipe (307) is arranged at the axial center end of the circular groove (305), main water pipes (201) are respectively arranged on both sides of the foundation pit (1), the ends of the water delivery pipes (205) far away from the filter column (301) are respectively slidably inserted into branch water pipes (202), each branch water pipe (202) is communicated with the main water pipe (201), water pumps (2) are also arranged on both sides of the foundation pit (1), and the water pumps (2) are connected with the main water pipes (201).

8. A construction device for dewatering in deep foundation pits according to claim 7, characterized in that, Each first sealing plate (5) is respectively fixed to the first positioning ring (505) through an L-shaped bracket (504), each second sealing plate (603) is respectively fixed to the second positioning ring (509), the first lifting part includes a first push plate (506) fixedly arranged on the water delivery pipe (205), the second lifting part includes a second push plate (507) fixedly arranged on the water delivery pipe (205), a second elastic part is arranged on the filter column (301), and the first sealing plate (5) and the second sealing plate (603) are respectively connected with the second elastic part; Wherein, the tops of the water delivery pipes (205) are fixed by connecting frames (203), lifting cylinders (204) are respectively arranged on both sides of the foundation pit (1), and the driving ends of the lifting cylinders (204) are fixed to the connecting frames (203).

9. A construction method for dewatering in deep foundation pits, which uses a construction device for dewatering in deep foundation pits described in claim 8, characterized in that, Including the following steps: A plurality of dewatering wells (101) are arranged on the periphery of the foundation pit (1); The filter column (301) is placed in the dewatering well (101), and at the same time, the water delivery pipe (205) is connected with the water pump (2) through the branch water pipe (202) and the main water pipe (201); The lifting cylinder (204) drives the water delivery pipe (205) to rise. The water delivery pipe (205) drives the first positioning ring (505) to rise through the first push plate (506). The first positioning ring (505) can drive the first sealing plate (5) to separate from the water inlet (601) through the L-shaped bracket (504), and the water in the precipitation well (101) enters the sedimentation chamber (6). After the water inlet is completed, the lifting cylinder (204) drives the water delivery pipe (205) to descend a certain distance, and the second elastic part drives the first sealing plate (5) to reset and seal the water inlet (601) under the action of elastic force. The sand and gravel deposited at the bottom of the sedimentation chamber (6) are scraped off by the scraper (605). The lifting cylinder (204) drives the water delivery pipe (205) to descend further. During the descent of the water delivery pipe (205), the second push plate (507) is used to push the second positioning ring (509) to descend a certain distance. The second positioning ring (509) drives the second sealing plate (603) to separate from the water outlet (602), and the water in the sedimentation chamber (6) is discharged into the drainage chamber (306). Start the water pump (2), and the water pump (2) pumps out the water in the drain pipe (307) successively through the water delivery pipe (205), the branch water pipe (202) and the main water pipe (201).

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