A deep foundation pit dewatering well assembly and a plugging method thereof

Abstract

The application discloses a deep foundation pit dewatering well assembly and a plugging method thereof, comprising a well sleeve and a sleeve pipe. The application has the beneficial effects that waterproof coiled materials are arranged at pouring positions respectively when pouring concrete, the water seepage probability after aging of a flange plug rubber gasket is effectively reduced by increasing waterproof measures, the water pump is convenient to replace and maintain during dewatering, all the water pumps can be taken out during plugging to reduce cost, welding construction is not needed during construction, pouring concrete can be immediately carried out after the water pump is taken out, flange plug installation is quickly completed to achieve the effect of rapid plugging, and the well plugging process is simple in operation, few in steps, fast in speed and good in effect compared with other methods.

Description

A deep foundation pit dewatering well assembly and its sealing method Technical Field

[0001] This invention relates to a deep foundation pit dewatering well assembly and its sealing method, specifically a deep foundation pit dewatering well assembly and its sealing method, belonging to the field of dewatering well sealing technology. Background Technology

[0002] With rapid economic development and massive urban construction, buildings are constantly being excavated downwards. Increasingly deep underground structures present challenges to groundwater, necessitating dewatering measures for deep foundation pit construction. However, sealing the dewatering wells within the structure after completion becomes a major hidden danger of leakage. The high water level difference and inflow volume in deep foundation pits dictate that dewatering wells must be sealed quickly, and the anti-leakage measures during the sealing process must be foolproof.

[0003] However, existing methods for sealing rainwater wells have some problems when implemented:

[0004] 1) Most existing methods for sealing dewatering wells involve directly pouring concrete without adding waterproofing measures. After prolonged use, this can lead to water leakage due to the aging of the rubber gaskets on the flange plugs.

[0005] 2) Existing methods for sealing dewatering wells involve many steps and complex operations, increasing the workload and costs of construction. Summary of the Invention

[0006] The purpose of this invention is to provide a deep foundation pit dewatering well assembly and its sealing method in order to solve the above-mentioned problems.

[0007] This invention achieves the above objective through the following technical solution: a deep foundation pit dewatering well assembly, comprising:

[0008] The well casing is set inside a pre-excavated sinkhole. A cushion layer is poured on the upper side of the sinkhole, and a brick formwork is built on the side of the cushion layer closest to the well casing.

[0009] The casing is vertically inserted into the upper interior of the well casing, and a well pipe is inserted into the casing and the well casing. One end of the well pipe extends to the outside of the casing and is connected to an external water pump system.

[0010] As a further aspect of the present invention: asphalt-impregnated hemp fibers are provided between the well casing and the sidewall of the casing.

[0011] As a further embodiment of the present invention: waterproof membrane is provided on the upper side of the cast-in-place layer, the brick formwork, and the outer wall of the sleeve.

[0012] As a further embodiment of the present invention: concrete is poured on the upper side of the sinkhole, and a raft waterproof membrane is provided on the upper side of the concrete. The raft waterproof membrane is turned up to the top of the sleeve and tied to the side wall of the sleeve. Valve plate concrete is poured on the upper side of the raft waterproof membrane to form a foundation beam.

[0013] As a further embodiment of the present invention: a flange is bolted to the upper end of the sleeve, and a formwork is installed on the upper side of the valve plate concrete on the outside of the flange. C35 concrete is poured inside the formwork, and the waterproof membrane of the raft slab is turned up to the upper side of the C35 concrete and laid with the C35 concrete.

[0014] As a further embodiment of the present invention: plain concrete is backfilled inside the waterproof membrane of the foundation beam and the raft slab.

[0015] As a further embodiment of the present invention: the sleeve is composed of a seamless steel pipe and wing rings, the seamless steel pipe is symmetrically welded with wing rings on both sides, and the upper end of the seamless steel pipe is fixedly installed with a flange by bolts.

[0016] A deep foundation pit dewatering well assembly, the sealing method of which is as follows:

[0017] a. First, excavate the sinkhole, pre-embed the well casing, then carry out waterproofing construction, and finally pour concrete to fill the pit to form a reinforced well ring area;

[0018] b. Cut off the excess well casing wall, then pour a bedding layer in the sinkhole and build a brick formwork;

[0019] c. Insert the casing into the well casing, and place asphalt hemp fibers between the side walls of the well casing and the casing. Turn the waterproof membrane up and pour concrete.

[0020] d. Then, install the raft slab waterproof membrane on the upper side of the concrete, turn the raft slab waterproof membrane up to the top of the sleeve, tie it to the side wall of the sleeve, and pour valve plate concrete on the upper side of the raft slab waterproof membrane to form the foundation beam.

[0021] e. At this point, the dewatering is stopped, and the water pump is pulled out of the well casing through the well pipe. Then, concrete is backfilled into the well casing, and a flange is installed on the upper side of the casing for sealing.

[0022] f. Next, formwork is erected on the outside of the flange, and C35 concrete is poured inside the formwork. The raft waterproof membrane is then flipped up onto the top of the C35 concrete and laid on top of it. Finally, plain concrete is poured on the outside of the formwork to fill the foundation beam, thus completing the sealing.

[0023] The beneficial effects of this invention are:

[0024] 1) In this invention, waterproof membrane is installed at each pouring position when pouring concrete. By adding waterproof measures, the probability of water leakage due to the aging of the rubber gasket of the flange plug can be effectively reduced. Moreover, the water pump is easy to replace and maintain during rainfall, and all water pumps can be removed when sealing to reduce costs.

[0025] 2) This invention does not require welding during construction. Concrete can be poured immediately after pump disassembly, and flange plugs can be installed quickly to achieve rapid sealing. Compared with other methods, its well sealing process is simple to operate, has fewer steps, is faster, and has better results. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the dewatering construction structure of the dewatering well of the present invention;

[0027] Figure 2 is a schematic diagram of the structure during the sealing process of the dewatering well of the present invention;

[0028] Figure 3 is a schematic diagram of the structure when the dewatering well sealing of the present invention is completed;

[0029] Figure 4 is a schematic diagram of the sleeve structure in this invention;

[0030] Figure 5 is a schematic diagram of the flange structure in this invention;

[0031] In the diagram: 1. Well casing, 2. Brick formwork, 3. Subbase, 4. Casing, 5. Asphalt hemp fiber, 6. Raft waterproof membrane, 7. Well pipe, 8. Sinking pit, 9. Valve plate concrete, 10. Plain concrete, 11. Formwork, 12. C35 concrete, 13. Seamless steel pipe, 14. Wing ring, 15. Flange, 16. Bolt, 17. Concrete, 18. Waterproof membrane. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Please refer to Figures 1-5. A deep foundation pit dewatering well assembly includes:

[0035] Well casing 1 is set inside a pre-excavated sinkhole 8. A cushion layer 3 is poured on the upper side of the sinkhole 8, and a brick formwork 2 is built on the side of the cushion layer 3 near the well casing 1.

[0036] The casing 4 is vertically inserted into the upper interior of the well casing 1, and a well pipe 7 is inserted into the casing 4 and the well casing 1. The well pipe 7 extends to one end outside the casing 4 and is connected to an external water pump system.

[0037] In this embodiment of the invention, asphalt hemp fiber 5 is provided between the sidewalls of the well casing 1 and the casing 4, so that concrete will not leak from the gap between the two when concrete is poured later.

[0038] In this embodiment of the invention, waterproof membrane 18 is provided on the upper side of the cast-in-place layer 3, the brick formwork 2, and the outer wall of the sleeve 4, which can improve their waterproof performance.

[0039] In this embodiment of the invention, concrete 17 is poured on the upper side of the sinkhole 8, and a raft waterproof membrane 6 is provided on the upper side of the concrete 17. The raft waterproof membrane 6 is turned up to the top of the sleeve 4 and tied to the side wall of the sleeve 4. Valve plate concrete 9 is poured on the upper side of the raft waterproof membrane 6 to form a foundation beam, which can enhance the water-proof performance between the sinkhole 8 and the valve plate concrete 9.

[0040] In this embodiment of the invention, a flange 15 is bolted to the upper end of the sleeve 4. A formwork 11 is installed on the outer side of the flange 15 and installed on the upper side of the valve plate concrete 9. C35 concrete 12 is poured inside the formwork 11. The raft waterproof membrane 6 is turned up to the upper side of the C35 concrete 12 and laid on the C35 concrete 12. The flange 20 is used to plug the water to form a water stop to ensure that the sealing is foolproof.

[0041] Example 2

[0042] Please refer to Figures 1-5. A deep foundation pit dewatering well assembly includes:

[0043] Well casing 1 is set inside a pre-excavated sinkhole 8. A cushion layer 3 is poured on the upper side of the sinkhole 8, and a brick formwork 2 is built on the side of the cushion layer 3 near the well casing 1.

[0044] The casing 4 is vertically inserted into the upper interior of the well casing 1, and a well pipe 7 is inserted into the casing 4 and the well casing 1. The well pipe 7 extends to one end outside the casing 4 and is connected to an external water pump system.

[0045] In this embodiment of the invention, plain concrete 10 is backfilled inside the foundation beam and the waterproof membrane 6 of the raft slab to facilitate sealing of the dewatering well.

[0046] In this embodiment of the invention, the casing 4 is composed of a seamless steel pipe 13 and a wing ring 14. The seamless steel pipe 13 is symmetrically welded with wing rings 14 on both sides. The upper end of the seamless steel pipe 13 is fixedly installed with a flange 15 by bolts 16. By providing wing rings 14 on both side walls of the casing 4, the probability of water in the pit seeping into the wellhead can be reduced.

[0047] Working principle: When using this deep foundation pit dewatering well component and its sealing method, first excavate the sinking pit 8, pre-embed the well casing 1, then carry out waterproofing construction, pour concrete to fill the pit and reinforce the well ring area; cut off the excess well casing 1 wall, then pour the cushion layer 3 in the sinking pit 8, and build the brick formwork 2; insert the casing 4 into the well casing 1, and place asphalt hemp fiber 5 between the side walls of the well casing 1 and the casing 4, turn the waterproof membrane 18 up, and pour concrete 17; then place the raft waterproof membrane 6 on the upper side of the concrete 17, turn the raft waterproof membrane 6 up to the top of the casing 4, and tie it to the casing. On the side wall of 4, pour valve plate concrete 9 on the upper side of the raft waterproof membrane 6 to form a foundation beam; at this time, stop the dewatering and pump the water pump out of the well casing 1 through the well pipe 7, then backfill the well casing 1 with concrete, and install flange 15 on the upper side of the casing 4 for sealing. Then, formwork 11 is erected on the outside of flange 15, and C35 concrete 12 is poured inside the formwork 11. The raft waterproof membrane 6 is turned up to the upper side of C35 concrete 12 and laid with C35 concrete 12; finally, plain concrete 10 is poured on the outside of the formwork 11 to fill the foundation beam, thus completing the sealing.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for sealing a deep foundation pit dewatering well assembly, characterized in that... The deep foundation pit dewatering well assembly includes: a well casing (1), which is set inside a pre-excavated sinkhole (8), with a bedding layer (3) poured on the upper side of the sinkhole (8), and a brick formwork (2) built on the side of the bedding layer (3) near the well casing (1); a casing (4), which is vertically inserted into the upper side of the well casing (1), and a well pipe (7) is inserted into the well casing (4) and the well casing (1), with one end of the well pipe (7) extending to the outside of the casing (4) and connected to an external water pump system; asphalt hemp fiber (5) is provided between the side walls of the well casing (1) and the casing (4); waterproof membrane (18) is provided on the upper side of the poured bedding layer (3), the brick formwork (2), and the outer wall of the casing (4); the sinkhole... Concrete (17) is poured on the upper side of the pit (8), and raft waterproof membrane (6) is provided on the upper side of the concrete (17). The raft waterproof membrane (6) is turned up to the top of the sleeve (4) and tied to the side wall of the sleeve (4). Valve plate concrete (9) is poured on the upper side of the raft waterproof membrane (6) to form a foundation beam. A flange (15) is installed on the upper end of the sleeve (4) by bolts. A formwork (11) is installed on the upper side of the valve plate concrete (9) on the outside of the flange (15). C35 concrete (12) is poured inside the formwork (11). The raft waterproof membrane (6) is turned up to the upper side of the C35 concrete (12) and laid with the C35 concrete (12). The sealing method is as follows: a. First, excavate the sinkhole (8), pre-embed the well casing (1), then carry out waterproofing construction and pour concrete to fill the pit to form a reinforced well ring area; b. Cut off the excess well casing (1) wall, then pour a cushion layer (3) in the sinkhole (8) and build a brick formwork (2); c. Insert the casing (4) into the well casing (1), and set asphalt hemp fiber (5) between the side walls of the well casing (1) and the casing (4), turn the waterproof membrane (18) up, and pour concrete (17); d. Then set the raft waterproof membrane (6) on the upper side of the concrete (17), turn the raft waterproof membrane (6) up to the top of the casing (4), tie it to the side wall of the casing (4), and pour valve plate concrete (9) on the upper side of the raft waterproof membrane (6) to form a foundation beam; e. At this point, the dewatering is stopped, and the water pump is pulled out from the well casing (1) through the well pipe (7). Then, concrete is backfilled into the well casing (1), and a flange (15) is installed on the upper side of the casing (4) for sealing. f. Next, formwork (11) is erected on the outside of the flange (15), and C35 concrete (12) is poured inside the formwork (11). The raft waterproof membrane (6) is turned up to the upper side of the C35 concrete (12) and laid with the C35 concrete (12). g. Finally, plain concrete (10) is poured on the outside of the formwork (11) to fill the foundation beam, thus completing the sealing.

2. The sealing method according to claim 1, characterized in that: Plain concrete (10) is backfilled inside the foundation beam and the waterproof membrane (6) of the raft.

3. The sealing method according to claim 1, characterized in that: The sleeve (4) is composed of a seamless steel pipe (13) and a wing ring (14). The wing ring (14) is symmetrically welded on both sides of the seamless steel pipe (13). The upper end of the seamless steel pipe (13) is fixedly installed with a flange (15) by bolts (16).

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