Local dewatering device in sump

Abstract

The utility model discloses a local dewatering device in a sump, which comprises the sump dug at the bottommost position of a deep foundation pit, a dewatering structure is arranged below the bottom of the sump, the dewatering structure comprises a water collecting cavity and a water pumping pipeline, a filter layer is arranged on the wall surface of the water collecting cavity, one end of the water pumping pipeline is communicated with the water collecting cavity, and the other end of the water pumping pipeline is communicated with the deep foundation pit. The other end of the water pumping pipeline penetrates through the water collection pit to be connected with a self-priming pump, and after concrete pouring of the water collection pit is completed, cement mortar is injected into the water collection cavity through the water pumping pipeline, and the water collection cavity is backfilled and blocked; the dewatering structure is arranged below the bottom of the sump, the dewatering structure effectively lowers the underground water level of a local area and improves the dewatering efficiency, dewatering and drainage are stopped after backfilling is conducted on the periphery of the foundation pit, the whole construction operation is safe and reliable, and the quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of building construction, in particular to a local precipitation device in a sump. Background Art

[0002] With the continuous development of construction projects, the construction of underground structures such as basements and underground garages is becoming more and more common. During the construction of these underground structures, groundwater problems are often encountered, and precipitation treatment is required to ensure the smooth progress of construction and the quality of the project.

[0003] Sump is an important facility in underground structures for collecting and discharging groundwater. However, in some cases, the groundwater level may be high in some local areas within the sump, and traditional precipitation methods are difficult to effectively solve these local precipitation problems.

[0004] For example, in some areas with complex geological conditions, groundwater is unevenly distributed, and there may be some local aquifers in the sump, making it difficult to lower the groundwater level in these areas. In addition, traditional precipitation methods such as well point precipitation and open ditch drainage often need to be arranged throughout the construction area, with high construction costs and unsatisfactory results in solving local precipitation problems.

[0005] Therefore, in order to effectively solve the problem of local precipitation in the sump, improve construction efficiency and quality, and reduce construction costs, it is necessary to develop a special local precipitation device in the sump. Utility Model Content

[0006] The purpose of the utility model is to provide a local precipitation device in a sump. By arranging a precipitation structure below the bottom of the sump, the precipitation structure effectively lowers the groundwater level in the local area and improves the precipitation efficiency. At the same time, the precipitation and drainage are stopped only after the periphery of the foundation pit is backfilled. The entire construction operation is safe and reliable, and the quality is guaranteed.

[0007] In order to achieve the above technical objectives, the utility model is implemented through the following technical solutions:

[0008] A local dewatering device in a sump, comprising a sump dug at the lowest point of a deep foundation pit, wherein a dewatering structure is arranged below the bottom of the sump;

[0009] The precipitation structure includes a water collection chamber and a water pumping pipeline. The wall of the water collection chamber is provided with a filter layer. One end of the water pumping pipeline is connected to the water collection chamber, and the other end of the water pumping pipeline passes through the water collection pit and is connected to a self-priming pump.

[0010] Among them, after the concrete pouring of the sump is completed, cement mortar is injected into the sump cavity through the pumping pipeline to backfill and seal the sump cavity.

[0011] In this scheme, the dewatering structure is located below the sump at the lowest point of the deep foundation pit. The water collected in the dewatering structure is pumped out by a self-priming pump, thereby effectively lowering the groundwater level in the local area. After the concrete pouring of the sump is completed, the pumping pipeline can be converted into a grouting pipeline, and cement mortar is injected into the sump to backfill and seal the sump. The construction environment can be kept simple during the entire construction process, the construction quality of the foundation construction is improved, and the problem of local dewatering in the sump is solved. At the same time, the dewatering is stopped only after the backfill around the foundation pit. The entire construction operation is safe and reliable, and the quality is guaranteed.

[0012] As a further technical solution of the local precipitation device, the precipitation structure also includes a steel cage, and the steel cage is enclosed below the bottom of the sump to form the sump cavity.

[0013] In this solution, the steel cage is a hollow structure and is connected end to end to form a water collection chamber. The water below the sump is collected in the water collection chamber for centralized extraction, thereby improving the precipitation efficiency.

[0014] As a further technical solution of the local precipitation device, the steel cage is filled with pebbles with a diameter of 100 to 300 mm.

[0015] In this solution, the hollow structure of the steel cage is filled with pebbles with a diameter of 100 to 300 mm to filter out impurities in the water, thereby avoiding blockage during the pumping process and enhancing the supporting force of the steel cage.

[0016] As a further technical solution to the local precipitation device, the outer periphery of the steel cage is backfilled with gravel to further filter impurities in the water to avoid blockage during the pumping process.

[0017] As a further technical solution of the local precipitation device, the top of the water collecting chamber is also covered with a concrete cover plate with a thickness of not less than 200 mm. The concrete cover plate isolates the water collecting chamber from the bottom of the sump, making the water collecting chamber a relatively independent system and preventing sand and gravel from falling during earth excavation.

[0018] As a further technical solution of the local precipitation device, the pumping pipeline includes a slurry outlet pipe and a grouting pipe. The grouting pipe is connected to the self-priming pump, and the slurry outlet pipe is connected to the external atmosphere. The internal and external pressures of the water collecting chamber are balanced through the slurry outlet pipe.

[0019] As a further technical solution to the local precipitation device, the other end of the slurry outlet pipe extends into the water collecting chamber by 0 to 50 mm, and the other end of the grouting pipe is 0 to 100 mm away from the bottom of the water collecting chamber. Such an arrangement can ensure that there is no gap in the water collecting chamber after the cement mortar is injected, thereby preventing the formation of a cavity under the water collecting pit, posing a threat to construction safety and the surrounding environment.

[0020] As a further technical solution of the local precipitation device, the grouting pipe is provided with a check valve to prevent the water in the grouting pipe from flowing back into the water collecting chamber due to vacuum after shutdown.

[0021] As a further technical solution of the local precipitation device, after the water collection cavity is backfilled and sealed by the grouting pipe, the slurry outlet pipe and the portion of the grouting pipe extending out of the bottom of the water collection pit are cut off and sealed at the incision by welding with sealing plates.

[0022] In this scheme, when the concrete of the sump reaches 100% strength after pouring, the pumping is stopped and high-pressure grouting is carried out in the grouting pipe. After complete grouting, the slurry outlet pipe and the grouting pipe are cut out and sealed by welding with sealing plates to avoid the poor stability in the initial stage of the cushion layer and waterproofing construction. Due to the premature cessation of pumping, the accumulated water cannot be pumped out, and the water pressure squeezes other parts and destroys the stability.

[0023] As a further technical solution of the local precipitation device, the sealing plate is painted with anti-rust paint after welding to prevent the sealing plate from rusting.

[0024] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0025] The utility model provides a local precipitation device in a sump, a sump is dug at the lowest point of a deep foundation pit, and a precipitation structure is arranged below the bottom of the sump, the precipitation structure draws water collected in the precipitation structure through a self-priming pump, thereby effectively lowering the groundwater level in the local area, and after the sump concrete is poured, the pumping pipeline can be converted into a grouting pipeline, and cement mortar is injected into the sump cavity to backfill and seal the sump cavity, the construction environment can be kept simple during the entire construction process, the construction quality of the foundation construction is improved, the problem of local precipitation in the sump is solved, and the drainage is stopped only after the periphery of the foundation pit is backfilled, the entire construction operation is safe and reliable, and the quality is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0027] Figure 1 It is a structural schematic diagram of the utility model.

[0028] Marks and corresponding parts names in the attached drawings:

[0029] 1- raft foundation, 2- slurry outlet pipe, 3- check valve, 4- grouting pipe, 5- self-priming pump, 6- base, 7- sealing plate, 8- water stop ring, 9- waterproof clamp, 10- water collection chamber, 11- pebbles, 12- steel cage, 13- concrete cover plate, 14- foundation cushion. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0031] Example 1

[0032] This embodiment 1 provides a local precipitation device in a sump, such as Figure 1 As shown, it includes a sump dug at the lowest point of a deep foundation pit, a precipitation structure is arranged below the bottom of the sump, the precipitation structure includes a sump chamber 10 and a pumping pipe, the wall of the sump chamber 10 is provided with a filter layer, one end of the pumping pipe is connected to the sump chamber 10, and the other end of the pumping pipe passes through the sump to connect to a self-priming pump 5, wherein, when the sump concrete is poured, cement mortar is injected into the sump chamber 10 through the pumping pipe, and the sump chamber 10 is backfilled and sealed.

[0033] Among them, the precipitation structure includes a steel cage 12, which is a hollow structure and is connected end to end to form a water collection chamber 10. The water below the sump is collected in the water collection chamber 10 for centralized extraction to lower the local water level. To avoid blockage during the pumping process, pebbles with a diameter of 100 to 300 mm are filled in the hollow cavity of the steel cage 12 to filter the water. At the same time, gravel is backfilled around the outer side of the steel cage 12 to further filter impurities in the water.

[0034] At the same time, the top of the water collecting chamber 10 is also covered with a concrete cover plate 13 with a thickness of not less than 200 mm, and the water collecting chamber 10 is isolated from the bottom of the sump by the concrete cover plate 13.

[0035] In this embodiment, the above-mentioned water collecting chamber 10 is first excavated at the bottom of the deep foundation pit, and the opening of the water collecting chamber 10 is closed by a concrete cover plate 13. At the same time, one end of the pumping pipe is connected to the water collecting chamber 10, and the other end extends out of the water collecting pit. Then, the foundation cushion layer 14 and the raft foundation 1 are poured in sequence. During this process, the self-priming pump 5 continuously extracts water from the water collecting chamber 10.

[0036] Among them, in some embodiments, the above-mentioned self-priming pump 5 is installed on the base 6, its output end is connected to the grouting pipe 4, and a float valve is installed at the other end of the grouting pipe 4. When the water level in the water collecting chamber 10 exceeds the warning line, the self-priming pump 5 can start automatically for automatic drainage.

[0037] Among them, the above-mentioned pumping pipeline includes a slurry outlet pipe 2 and a grouting pipe 4. The grouting pipe 4 is connected to the self-priming pump 5, and the slurry outlet pipe 2 is connected to the outside atmosphere. The internal and external pressures of the water collecting chamber 10 are balanced through the slurry outlet pipe 2. Specifically, the other end of the slurry outlet pipe 4 extends into the water collecting chamber 10 by 50 mm, and the other end of the grouting pipe 4 is 100 mm away from the bottom of the water collecting chamber. Such an arrangement can ensure that there is no gap in the water collecting chamber 10 after the cement mortar is injected, so that no cavity will be formed under the sump, posing a threat to construction safety and the surrounding environment.

[0038] Example 2

[0039] This embodiment 2 provides another local precipitation device in a sump, such as Figure 1 As shown, it includes a sump dug at the lowest point of a deep foundation pit, a precipitation structure is arranged below the bottom of the sump, the precipitation structure includes a sump chamber 10 and a pumping pipe, the wall of the sump chamber 10 is provided with a filter layer, one end of the pumping pipe is connected to the sump chamber 10, and the other end of the pumping pipe passes through the sump to connect to a self-priming pump 5, wherein, when the sump concrete is poured, cement mortar is injected into the sump chamber 10 through the pumping pipe, and the sump chamber 10 is backfilled and sealed.

[0040] Among them, the precipitation structure includes a steel cage 12, which is a hollow structure and is connected end to end to form a water collection chamber 10. The water below the sump is collected in the water collection chamber 10 for centralized extraction to lower the local water level. To avoid blockage during the pumping process, pebbles with a diameter of 100 to 300 mm are filled in the hollow cavity of the steel cage 12 to filter the water. At the same time, gravel is backfilled around the outer side of the steel cage 12 to further filter impurities in the water.

[0041] At the same time, the top of the water collecting chamber 10 is also covered with a concrete cover plate 13 with a thickness of not less than 200 mm, and the water collecting chamber 10 is isolated from the bottom of the sump by the concrete cover plate 13.

[0042] In this embodiment, the above-mentioned water collecting chamber 10 is first excavated at the bottom of the deep foundation pit, and the opening of the water collecting chamber 10 is closed by a concrete cover plate 13. At the same time, one end of the pumping pipe is connected to the water collecting chamber 10, and the other end extends out of the water collecting pit. Then, the foundation cushion layer 14 and the raft foundation 1 are poured in sequence. During this process, the self-priming pump 5 continuously extracts water from the water collecting chamber 10.

[0043] At the same time, in order to prevent the water in the grouting pipe 4 from flowing back into the water collecting chamber 10 due to vacuum after shutdown, a check valve 3 is installed on the pipe body of the grouting pipe 4. When the concrete of the sump reaches 100% strength after pouring, the pumping is stopped and high-pressure grouting is carried out in the grouting pipe 4. After complete grouting, the slurry outlet pipe 2 and the part of the grouting pipe 4 extending out of the bottom of the sump are cut off, and the incisions are welded and sealed by a sealing plate 7. In order to prevent the sealing plate 7 from rusting, the sealing plate 7 is painted with anti-rust paint after welding.

[0044] Among them, the above-mentioned pumping pipeline includes a slurry outlet pipe 2 and a grouting pipe 4. The grouting pipe 4 is connected to the self-priming pump 5, and the slurry outlet pipe 2 is connected to the outside atmosphere. The internal and external pressures of the water collecting chamber 10 are balanced through the slurry outlet pipe 2. Specifically, the other end of the slurry outlet pipe 4 extends into the water collecting chamber 10 by 50 mm, and the other end of the grouting pipe 4 is 100 mm away from the bottom of the water collecting chamber. Such an arrangement can ensure that there is no gap in the water collecting chamber 10 after the cement mortar is injected, so that no cavity will be formed under the sump, posing a threat to construction safety and the surrounding environment.

[0045] Example 3

[0046] Embodiment 3 provides another local precipitation device in a sump based on Embodiment 1 or 2, such as Figure 1 As shown, the slurry outlet pipe 2 and the grouting pipe 4 are located in the raft foundation 1 and are respectively installed with a water stop ring 8 and a waterproof clamp 9 to prevent leakage of the pumping pipeline.

[0047] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A local precipitation device in a sump, characterized in that: It includes a water collection pit dug at the bottom of the deep foundation pit, and a precipitation structure is arranged below the bottom of the water collection pit; The precipitation structure comprises a water collecting chamber (10) and a water pumping pipeline, the wall surface of the water collecting chamber (10) is provided with a filter layer, one end of the water pumping pipeline is connected to the water collecting chamber (10), and the other end of the water pumping pipeline passes through the water collecting pit and is connected to a self-priming pump (5); Wherein, after the pouring of the sump concrete is completed, cement mortar is injected into the sump cavity (10) through the pumping pipeline, and the sump cavity (10) is backfilled and sealed.

2. A local precipitation device in a sump according to claim 1, characterized in that: The precipitation structure further comprises a steel cage (12), wherein the steel cage (12) encloses the water collection chamber (10) below the bottom of the water collection pit.

3. A local precipitation device in a sump according to claim 2, characterized in that: The steel cage (12) is filled with pebbles with a diameter of 100 to 300 mm.

4. A local precipitation device in a sump according to claim 3, characterized in that: The outer periphery of the steel cage (12) is backfilled with crushed stones.

5. The local precipitation device in a sump according to claim 1, characterized in that: The top of the water collecting chamber (10) is also covered with a concrete cover plate (13) with a thickness of not less than 200 mm.

6. The local precipitation device in a sump according to claim 1, characterized in that: The water pumping pipeline comprises a slurry outlet pipe (2) and a grouting pipe (4); the grouting pipe (4) is connected to the self-priming pump, and the slurry outlet pipe (2) is connected to the outside atmosphere.

7. A local precipitation device in a sump according to claim 6, characterized in that: The other end of the slurry outlet pipe (2) extends into the water collecting chamber (10) by 0 to 50 mm, and the other end of the grouting pipe (4) is 0 to 100 mm away from the bottom of the water collecting chamber (10).

8. The local precipitation device in a sump according to claim 6, characterized in that: The grouting pipe (4) is provided with a check valve (3).

9. The local precipitation device in a sump according to claim 6, characterized in that: After the water collecting cavity (10) is backfilled and sealed through the grouting pipe (4), the grouting pipe (2) and the portion of the grouting pipe (4) extending out of the bottom of the water collecting pit are cut off, and the cuts are welded and sealed through a sealing plate (7).

10. A local precipitation device in a sump according to claim 9, characterized in that: The sealing plate (7) is painted with anti-rust paint after welding.

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