Foundation pit well point dewatering excavation supporting device

Abstract

The invention relates to the technical field of constructional engineering, and discloses a foundation pit well point dewatering excavation supporting device which comprises a filtering assembly, the filtering assembly comprises a filtering cylinder and filtering cloth, and the filtering cloth is arranged on the inner side of the filtering cylinder and is in a relaxed state; the drainage pipe is arranged on the inner side of the filter cloth and is used for draining water on the inner side of the filter cloth; the flexible bag is fixedly arranged on the inner side of the filter cloth; the driving rod is arranged at the top of the filter cartridge in a sliding manner and is used for driving the flexible bag to clean the filter cloth. According to the foundation pit well point dewatering excavation supporting device, the problems that in the prior art, due to the fact that a filtering piece is located in a seepage well and the space in the well is limited, the filtering piece in the well is inconvenient to clean, and the long-term supporting effect is difficult to maintain can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a foundation pit well point dewatering excavation support device. Background Art

[0002] Foundation pit wellpoint dewatering excavation support is a commonly used technical measure in construction projects. It is mainly used in foundation pit excavation in areas with high groundwater levels to prevent construction difficulties or accidents caused by groundwater influx into the foundation pit. Wellpoint dewatering is achieved by setting up a certain number of dewatering wells around the foundation pit, using pumping equipment to pump out groundwater, lowering the groundwater level in the foundation pit, thereby creating a dry construction environment for foundation pit excavation.

[0003] When traditional foundation pit excavation support uses pumping equipment to extract groundwater, the mud and sand inside the seepage well can easily cause blockage and other adverse effects on the pumping equipment, so the well water needs to be filtered during pumping; when filtering the mud and sand, filter screens, filter plates and other filter elements are generally used. The filtering effect of the filter element will decrease as the filtering time increases. Since the filter element is located inside the seepage well and the space inside the well is limited, it is not convenient to clean the filter element in the well, and it is difficult to maintain a long-term support effect. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a foundation pit well point dewatering excavation support device, which can effectively solve the problem in the prior art that the filter element is located inside the seepage well and the space inside the well is limited, making it inconvenient to clean the filter element in the well and difficult to maintain a long-term support effect.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a foundation pit well point dewatering excavation support device, comprising: The shell is placed and supported in the precipitation well in the working state; A filter assembly is arranged on one side of the housing, the filter assembly comprises a filter cartridge and a filter cloth, the filter cloth is arranged on the inner side of the filter cartridge in a relaxed state so as to be able to vibrate when subjected to force; A drainage pipe is arranged inside the filter cloth and is used to discharge the water entering the inside of the filter cloth through the filter assembly for precipitation; A flexible bag is fixedly arranged on the inner side of the filter cloth, and the flexible bag can drive the filter cloth in a relaxed state to vibrate; The driving rod is slidably arranged on the top of the filter cartridge and is used for driving the medium to enter the flexible bag to clean the filter cloth.

[0006] Furthermore, a fixing plate is fixedly disposed on the top and the bottom of the filter cartridge, and the two fixing plates are fixedly disposed by a plurality of fixing rods.

[0007] Furthermore, a connecting piece is connected to the top of the flexible bag, and the connecting piece passes through the top fixed plate and is fixedly connected to the top fixed plate. The top fixed plate is fixedly provided with a first sealing tube, and the bottom of the driving rod is fixedly provided with a first plug body, and the first plug body cooperates with the first sealing tube. The driving rod rises and falls under the drive of external force.

[0008] Furthermore, auxiliary cylinders are fixedly arranged on both sides of the fixing plate at the top, and the two auxiliary cylinders are both connected to the filter cylinder. A device plate is fixedly arranged on the tops of the two auxiliary cylinders.

[0009] Furthermore, two lifting assemblies are arranged on the top of the first plug body, and the two lifting assemblies are respectively matched with corresponding auxiliary cylinders to store air when cleaning the filter cloth.

[0010] Furthermore, the two lifting assemblies each include a slide rope, and the two slide ropes are both arranged on the inner side of the device plate. One end of the two slide ropes is fixed to the top of the first plug body, and the other end of the two slide ropes is fixed with a counterweight block, and the bottom of the two counterweight blocks is fixed with an inflatable ring.

[0011] Furthermore, a second sealing cylinder is fixedly provided on the top of the device plate, a second plug body is fixedly provided on the outer side of the driving rod corresponding to the second sealing cylinder, and a mud discharge assembly is provided on the outer side of the second sealing cylinder for discharging mud and sand between the filter cylinder and the filter cloth.

[0012] Furthermore, the mud discharge assembly includes two mud suction pipes, one end of the two mud suction pipes is arranged on the outside of the second sealing cylinder through corresponding one-way inlet valves, and the other end of the two mud suction pipes is arranged on the inside of the filter cloth. The two mud suction pipes are driven by the driving rod to absorb the mud and sand between the filter cylinder and the filter cloth and discharge them into the inside of the second sealing cylinder.

[0013] Furthermore, the mud discharge assembly also includes a mud discharge pipe, one end of which is arranged outside the second sealing tube through a corresponding one-way outlet valve, and the other end of the mud discharge pipe is connected to an external transmission device.

[0014] Furthermore, a shell is fixedly disposed on the top of the fixing plate at the top, and an outer casing is fixedly disposed on the top of the shell.

[0015] Furthermore, a flow sensor is provided in the drainage pipe, and the lifting and lowering of the driving rod responds to the flow sensor.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 1. The present invention is provided with a flexible bag, which can expand and contract under the drive of a driving rod, thereby driving the filter cloth to expand and contract quickly, shaking off the mud and sand on the outside of the filter cloth, and through the expansion and squeezing of the flexible bag, the water inside the filter cloth is reversely infiltrated to wash the mud and sand on the outside of the filter cloth, effectively solving the problem in the prior art that the filter element is located inside the seepage well and the space in the well is limited, making it inconvenient to clean the filter element in the well and difficult to maintain a long-term support effect, and achieving the effect of facilitating the cleaning of the filter element.

[0017] 2. The present invention is provided with a mud discharge assembly, which drives the second plug body to rise and fall through a driving rod. With the cooperation of the second plug body and the second sealing cylinder, the mud discharge assembly absorbs and discharges the mud and sand between the filter cartridge and the filter cloth to prevent excessive mud and sand from affecting the filtering effect of the filter cartridge and the filter cloth.

[0018] 3. The present invention is provided with a lifting assembly, which can cooperate with the lifting assembly and the auxiliary cylinder to provide storage space for the air inside the filter cylinder when cleaning the filter cloth, thereby ensuring the smooth progress of the filter cloth cleaning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a filter cartridge cross section in an embodiment of the present invention; Figure 3 for Figure 2 The enlarged structural diagram of the middle A part; Figure 4 It is a schematic diagram of the structure of the filter cloth in an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of a flexible bag in an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a lifting assembly in an embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of the mud discharge assembly in an embodiment of the present invention.

[0021] The numbers in the figure represent: 1, filter cartridge; 11, filter cloth; 12, fixing plate; 121, fixing rod; 122, shell; 123, outer casing; 13, first sealing cylinder; 14, auxiliary cylinder; 15, installation plate; 16, second sealing cylinder; 17, mud discharge assembly; 171, mud suction pipe; 1711, one-way inlet valve; 172, mud discharge pipe; 1721, one-way outlet valve; 2. Drain pipe; 3. Flexible capsule; 4. Driving rod; 41. First plug body; 411. Lifting assembly; 4111. Slide rope; 4112. Counterweight block; 4113. Inflatable ring; 42. Second plug body. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] See also Figure 1-Figure 7 The present invention provides a technical solution: a foundation pit well point dewatering excavation support device, comprising: a shell 122, which is placed and supported in a dewatering well in a working state; a filter assembly, comprising a filter cartridge 1 and a filter cloth 11, the filter cloth 11 is arranged on the inner side of the filter cartridge 1 and is in a relaxed state, a drain pipe 2 is arranged on the inner side of the filter cloth 11, and is used to discharge the water inside the filter cloth 11, a flexible bag 3 is fixedly arranged on the inner side of the filter cloth 11, and a driving rod 4 is slidably arranged on the top of the filter cartridge 1, and is used to drive the medium into the flexible bag 3 to clean the filter cloth 11.

[0025] In the above technical scheme, during actual use, the device is placed as a whole in a precipitation well, and coarse sand is used to fill the space between the outer side of the device and the inner wall of the precipitation well. During the process of the device supporting the precipitation well, the seepage water in the soil passes through the coarse sand and the filter cartridge 1 and the filter cloth 11 to enter the interior of the filter cloth 11, and is discharged through the drain pipe 2; after a period of use, a certain amount of mud and sand adheres to the outer side of the filter cloth 11. At this time, the medium is injected into the flexible bag 3 through the driving rod 4, so that the flexible bag 3 swells and shakes off the mud and sand on the outer side of the filter cloth 11, thereby ensuring the long-term filtering effect of the filter cloth 11.

[0026] In the above technical solution, the medium injected into the flexible bag 3 can be water or liquid, and the medium can ensure the expansion and contraction of the flexible bag 3.

[0027] The top and bottom of the filter cartridge 1 are fixedly provided with fixing plates 12, and the two fixing plates 12 are fixedly provided by a plurality of fixing rods 121. The top of the flexible capsule 3 is connected with a connector, which is filled and penetrates the top fixing plate 12 and is fixedly connected with the top fixing plate 12. The top fixing plate 12 is fixedly provided with a first sealing cylinder 13, and the bottom of the driving rod 4 is fixedly provided with a first plug body 41, which cooperates with the first sealing cylinder 13, and the driving rod 4 is lifted and lowered under the drive of an external force.

[0028] That is, in the above technical solution, the driving rod 4 drives the first plug body 41 to move up and down in the first sealing tube 13 so that the medium moves between the first sealing tube 13 and the flexible bag 3, thereby realizing the expansion and contraction of the flexible bag 3.

[0029] Auxiliary cylinders 14 are fixedly arranged on both sides of the top fixing plate 12 . The two auxiliary cylinders 14 are connected to the filter cylinder 1 . A device plate 15 is fixedly arranged on the tops of the two auxiliary cylinders 14 .

[0030] Two lifting assemblies 411 are disposed on the top of the first plug body 41 . The two lifting assemblies 411 cooperate with corresponding auxiliary cylinders 14 respectively to store air when cleaning the filter cloth 11 .

[0031] The auxiliary cylinder 14 provided in the embodiment of the present application can absorb part of the water and gas in the process of the flexible bag 3 expanding and squeezing the water and possible gas in the filter cartridge 1, thereby preventing the part of the water and gas from impacting the coarse sand and the precipitation well structure outside the filter cartridge 1 with a large impact force during the cleaning of the filter cloth 11, thereby ensuring the stability of the precipitation well structure and the effectiveness of the device in supporting the precipitation well.

[0032] In a specific example, the auxiliary cylinder 14 is connected to the fixed plate 12 between the filter cartridge 1 and the filter cloth 11, so that in the process of the flexible bag 3 swelling, the space between the flexible bag 3 and the filter cloth 11 is suddenly reduced, and the pressure in the space is increased, which can effectively drive the filter cloth 11 to swell, and the increase in pressure can enable the water between the flexible bag 3 and the filter cloth 11 to quickly pass through the filter cloth 11 to shake off the mud and sand attached to the outside of the filter cloth 11; and when the filter cloth 11 swells under the drive of the flexible bag 3, the space between the filter cloth 11 and the filter cartridge 1 is also suddenly reduced. At this time, if the auxiliary cylinder 14 is not provided, the water between the filter cloth 11 and the filter cartridge 1 tends to quickly pass through the filter cartridge 1, so that the coarse sand and the precipitation well structure outside the filter cartridge 1 are impacted. When the auxiliary cylinder 14 is provided, the reduction in the space between the filter cloth 11 and the filter cartridge 1 can be filled by the auxiliary cylinder 14 space, that is, the pressure between the filter cloth 11 and the filter cartridge 1 will not change suddenly, effectively ensuring the stability of the external structure of the filter cartridge 1.

[0033] Exemplarily, the two lifting assemblies 411 each include a pulley 4111, and the two pulleys 4111 are both arranged on the inner side of the device plate 15. Specifically, the two pulleys 4111 are both arranged on the inner side of the device plate 15 through a pulley group, one end of the two pulleys 4111 is fixed to the top of the first plug body 41, and the other end of the two pulleys 4111 is fixedly provided with a counterweight block 4112, and the bottom of the two counterweight blocks 4112 is fixedly provided with an inflatable ring 4113.

[0034] By setting the slide rope 4111, the movement of the first plug body 41 drives the movement of the counterweight block 4112 and the inflatable ring 4113. When the first plug body 41 moves downward to inflate the flexible bag 3, the counterweight block 4112 and the inflatable ring 4113 move upward, providing space for the movement of the water body in the filter cartridge 1 and the water body that may exist; when the first plug body 41 moves upward for normal filtration, the counterweight block 4112 and the inflatable ring 4113 move downward so that the inflatable ring 4113 can block the connection between the auxiliary cylinder 14 and the filter cartridge 1, thereby ensuring effective filtration of the filter assembly.

[0035] A second sealing cylinder 16 is fixedly provided on the top of the device plate 15 , a second plug body 42 is fixedly provided on the outer side of the driving rod 4 corresponding to the second sealing cylinder 16 , and a mud discharge assembly 17 is provided on the outer side of the second sealing cylinder 16 for discharging mud and sand between the filter cylinder 1 and the filter cloth 11 .

[0036] The mud discharge assembly 17 includes two mud suction pipes 171, one end of the two mud suction pipes 171 is arranged on the outside of the second sealing cylinder 16 through the corresponding one-way inlet valve 1711, and the other end of the two mud suction pipes 171 is arranged on the inside of the filter cloth 11. The two mud suction pipes 171 are driven by the driving rod 4 to absorb the mud and sand between the filter cylinder 1 and the filter cloth 11 and discharge it into the inside of the second sealing cylinder 16.

[0037] The mud discharge assembly 17 further includes a mud discharge pipe 172 , one end of which is disposed outside the second sealing cylinder 16 via a corresponding one-way outlet valve 1721 , and the other end of the mud discharge pipe 172 is connected to an external transmission device.

[0038] In the above technical solution, by providing the mud discharge assembly 17 , mud and sand can be effectively discharged when there is a certain amount of mud and sand between the filter cartridge 1 and the filter cloth 11 , thereby ensuring the effectiveness of the filtration of the filter cloth 11 .

[0039] In addition, since the start and stop of the mud discharge assembly 17 is also driven by the driving rod 4, that is, when the driving rod 4 moves downward to make the flexible bag 3 expand, the second plug body 42 moves on the inner side of the second sealing tube 16 to discharge the mud and sand in the second sealing tube 16. In this process, the expansion of the flexible bag 3 can scatter the mud and sand from the outside of the filter cloth 11 in the water between the filter tube 1 and the filter cloth 11; when the driving rod 4 moves upward, the flexible bag 3 contracts. At this time, the second plug body 42 moves upward in the second sealing tube 16 to suck the water containing mud and sand into the second sealing tube 16 through the mud suction pipe 171 to facilitate the next discharge.

[0040] In some technical solutions, a shell 122 is fixedly provided on the top of the top fixing plate 12 , and an outer casing 123 is fixedly provided on the top of the shell 122 .

[0041] In the above technical solution, a flow sensor can be arranged in the drain pipe 2 to monitor the water output in the drain pipe 2 in real time. If the value of the flow sensor is lower than the preset value, it means that a large amount of mud and sand may be attached to the outside of the filter cloth 11 and needs to be cleaned. At this time, the driving rod 4 is reciprocated and lifted several times to shake off the mud and sand on the outside of the filter cloth 11. At the same time, the mud and sand shaken off between the filter cartridge 1 and the filter cloth 11 can be sucked out through the mud suction pipe 171 to ensure the filtering effect of the filter cloth 11.

[0042] In summary, the principles and advantages of the foundation pit wellpoint dewatering excavation support device described in the embodiments of the present application are as follows: When the device is in use, it is necessary to place the device in a precipitation well, fill the space between the shell 122, the outer casing 123 and the outer side of the filter cartridge 1 and the inner wall of the precipitation well with coarse sand, and fill the top of the outer casing 123 with clay. When filling, a position for connecting the drainage pipe 2, the driving rod 4 and the mud discharge pipe 172 is reserved. The seepage water in the soil is filtered by the coarse sand, the filter cartridge 1 and the filter cloth 11, and the content of particles such as mud and sand carried in the water is reduced. The drainage pipe 2 is driven by an external force to extract the water inside the filter cloth 11. The inside of the precipitation well is supported by coarse sand, clay and the foundation pit well point precipitation excavation support device recorded in the embodiment of the present application. By naturally seeping water from the soil and extracting the water, the foundation pit is kept dry while preventing excessive dehydration of the soil, thereby improving the support effect. When the filter cloth 11 needs to be cleaned, the driving rod 4 is driven to rise and fall by external force, so that the driving rod 4 drives the first plug body 41 to rise and fall inside the first sealing tube 13, so that the flexible bag 3 contracts and expands. Since the filter cloth 11 is in a relaxed state, when the flexible bag 3 contracts and expands, it can drive the filter cloth 11 to contract and expand, so that the mud and sand on the surface of the filter cloth 11 are shaken off, and when expanding, the water inside the filter cloth 11 will reversely infiltrate, and have the effect of flushing the mud and sand outside the filter cloth 11; at the same time, under the action of the filter cloth 11, the water in the filter cartridge 1 escapes from the filter holes opened on the filter cartridge 1, and washes down the impurities attached to the outside of the filter cartridge 1, thereby ensuring the filtering effect of the filter cartridge 1.

[0043] At the same time, when the first plug body 41 descends, the counterweight block 4112 and the inflatable ring 4113 can be driven to rise through the pulley block and the slide rope 4111. At this time, the flexible bag 3 expands, driving the filter cloth 11 to expand, and the air overflowing from the filter cartridge 1 enters the two auxiliary cylinders 14. The two auxiliary cylinders 14 ensure the normal cleaning work. When the first plug body 41 rises, the counterweight block 4112 and the inflatable ring 4113 fall and reset under their own gravity; When too much mud is stored between the filter cartridge 1 and the filter cloth 11, the two one-way inlet valves 1711 and the one-way outlet valve 1721 are opened, so that the driving rod 4 is driven to rise and fall under the external force, driving the second plug body 42 to slide in the second sealing tube 16. When the second plug body 42 rises, the mud is sucked into the second sealing tube 16 through the two mud suction pipes 171. When the second plug body 42 descends, the mud in the second sealing tube 16 is pushed into the mud discharge pipe 172 for discharge.

[0044] When the driving rod 4 in the foundation pit well point dewatering excavation support device of the present application drives the flexible bag 3 to clean the filter cloth 11, the driving rod 4 is driven down by external force, and the driving rod 4 drives the first plug body 41 to descend in the first sealing tube 13, and the air in the first sealing tube 13 is discharged into the flexible bag 3 to expand the flexible bag 3, and the flexible bag 3 expands the filter cloth 11, and then the driving rod 4 is driven up by external force, and the driving rod 4 drives the first plug body 41 to rise, so that the air in the flexible bag 3 returns to the first sealing tube 13, and the flexible bag 3 contracts to shrink the filter cloth 11, thereby completing the cleaning effect of the filter cloth 11.

[0045] It is worth mentioning that the above cleaning method has the following advantages: Advantage 1: The lifting and lowering of the first plug body 41 drives the filter cloth 11 to expand and contract rapidly, and the mud and sand on the outside of the filter cloth 11 are shaken off, thereby achieving the effect of cleaning the outside of the filter cloth 11.

[0046] Advantage 2: The lifting and lowering of the first plug body 41 drives the flexible bag 3 to expand and contract, so that the water inside the filter cloth 11 reversely permeates to the outside, washes the mud and sand outside the filter cloth 11, and has the effect of cleaning the outside of the filter cloth 11.

[0047] Advantage three, the first plug body 41 and the second plug body 42 are driven by the same driving rod 4, that is, when the first plug body 41 and the second plug body 42 move downward, the flexible bag 3 is driven to expand, so that the mud and sand on the outside of the filter cloth 11 are shaken off and cause a certain disturbance to the mud and sand in the filter cylinder 1; then the first plug body 41 and the second plug body 42 move downward, and during the movement, on the one hand, the flexible bag 3 is driven to contract, and on the other hand, the disturbed mud and sand can be sucked into the second sealing tube 16 by the mud suction pipe 171, so that the shaken-off mud and sand can be removed in time to avoid being adsorbed on the outside of the filter cloth 11 again.

[0048] Advantage four, by setting up the auxiliary tube 14, when the first plug body 41 moves downward to expand the flexible bag 3, part of the water / gas squeezed by the flexible bag 3 can enter the auxiliary tube 14, avoiding the impact of large water pressure / air pressure on the external structure of the filter cartridge 1, and ensuring the stability of the precipitation well structure.

[0049] Advantage five: by providing the counterweight block 4112 and the inflatable ring 4113, in a normal filtering state, the inflatable ring 4113 is sealed to the bottom side of the auxiliary tube 14, thereby ensuring effective filtering of the filter assembly.

[0050] In actual applications, the water inside the filter cloth 11 is discharged through the drain pipe 2, and the water between the filter cloth 11 and the filter cartridge 1 is discharged through the mud discharge pipe 172, so that the water and mud inside the equipment are discharged separately. The purpose is to enable the mud and water to be filtered inside the equipment, without the need to use separate equipment to filter the mud and water after discharge. In addition, there are generally many precipitation well points, and multiple devices need to be set up. The drain pipes 2 of multiple devices can be connected through an external conveying pipe to discharge sewage to a suitable location for collection. After the mud can be discharged through the mud discharge pipes 172 of multiple devices, the mud at each precipitation well point is cleaned separately at regular intervals.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. Foundation pit well point dewatering excavation support device, characterized in that: include: The housing (122) is placed and supported in the precipitation well in the working state; A filter assembly is arranged on one side of the housing (122), the filter assembly comprising a filter cartridge (1) and a filter cloth (11), the filter cloth (11) being arranged on the inner side of the filter cartridge (1) in a relaxed state so as to be able to vibrate when subjected to force; A drainage pipe (2) is arranged on the inner side of the filter cloth (11) and is used to discharge water entering the inner side of the filter cloth (11) through the filter assembly to achieve precipitation; A flexible bag (3) is fixedly arranged on the inner side of the filter cloth (11), and the flexible bag (3) can drive the filter cloth (11) in a relaxed state to vibrate; A driving rod (4) is slidably disposed on the top of the filter cartridge (1) and is used to drive the medium into the flexible bag (3) to clean the filter cloth (11).

2. The foundation pit well point dewatering excavation support device according to claim 1 is characterized in that: A fixing plate (12) is fixedly arranged at the top and the bottom of the filter cartridge (1), and the two fixing plates (12) are fixedly arranged via a plurality of fixing rods (121).

3. The foundation pit well point dewatering excavation support device according to claim 2 is characterized in that: The top of the flexible bag (3) is connected with a connecting piece, the connecting piece passes through the top fixing plate (12) and is fixedly connected to the top fixing plate (12), the top fixing plate (12) is fixedly provided with a first sealing cylinder (13), the bottom of the driving rod (4) is fixedly provided with a first plug body (41), the first plug body (41) cooperates with the first sealing cylinder (13), and the driving rod (4) rises and falls under the drive of an external force.

4. The foundation pit well point dewatering excavation support device according to claim 3 is characterized in that: Auxiliary cylinders (14) are fixedly arranged on both sides of the fixing plate (12) at the top, the two auxiliary cylinders (14) are both connected to the filter cylinder (1), and a device plate (15) is fixedly arranged on the top of the two auxiliary cylinders (14).

5. The foundation pit well point dewatering excavation support device according to claim 4 is characterized in that: Two lifting assemblies (411) are arranged on the top of the first plug body (41), and the two lifting assemblies (411) respectively cooperate with corresponding auxiliary cylinders (14).

6. The foundation pit well point dewatering excavation support device according to claim 5 is characterized in that: The two lifting assemblies (411) each comprise a slide rope (4111), the two slide ropes (4111) are both arranged on the inner side of the device plate (15), one end of the two slide ropes (4111) is fixedly arranged on the top of the first plug body (41), the other end of the two slide ropes (4111) is fixedly arranged with a counterweight block (4112), and the bottom of the two counterweight blocks (4112) is fixedly arranged with an inflatable ring (4113).

7. The foundation pit well point dewatering excavation support device according to claim 4 is characterized in that: A second sealing cylinder (16) is fixedly arranged on the top of the device plate (15), a second plug body (42) is fixedly arranged on the outer side of the driving rod (4) corresponding to the second sealing cylinder (16), and a mud discharge assembly (17) is arranged on the outer side of the second sealing cylinder (16) for discharging mud and sand between the filter cylinder (1) and the filter cloth (11).

8. The foundation pit well point dewatering excavation support device according to claim 7, characterized in that: The mud discharge assembly (17) comprises two mud suction pipes (171), one end of the two mud suction pipes (171) being arranged on the outside of the second sealing cylinder (16) through corresponding one-way inlet valves (1711), and the other end of the two mud suction pipes (171) being arranged on the inside of the filter cloth (11). The two mud suction pipes (171) are driven by the driving rod (4) to absorb mud and sand between the filter cylinder (1) and the filter cloth (11) and discharge them into the inside of the second sealing cylinder (16).

9. The foundation pit well point dewatering excavation support device according to claim 7, characterized in that: The mud discharge assembly (17) further comprises a mud discharge pipe (172), one end of the mud discharge pipe (172) being arranged outside the second sealing cylinder (16) via a corresponding one-way outlet valve (1721), and the other end of the mud discharge pipe (172) being connected to an external transmission device.

10. The foundation pit well point dewatering excavation support device according to claim 2, characterized in that: A shell (122) is fixedly disposed on the top of the fixing plate (12) at the top, and an outer casing (123) is fixedly disposed on the top of the shell (122).

11. The foundation pit well point dewatering excavation support device according to any one of claims 1 to 10, characterized in that: A flow sensor is arranged in the drainage pipe (2), and the lifting and lowering of the driving rod (4) responds to the flow sensor.

Images