Foundation pit dewatering and drainage precipitation system

Abstract

The utility model relates to the technical field of excavation, and discloses a foundation pit dewatering and drainage sedimentation system which comprises a foundation pit, a water pumping device, a water collecting structure, a first sedimentation device, a second sedimentation device and a drainage ditch, accumulated water collected in the water collecting structure is pumped and conveyed to the first sedimentation device through a water suction pump in the water pumping device, and finally conveyed to the municipal pipe well through the first sedimentation device, the second sedimentation device and the drainage ditch, and dewatering and drainage of the foundation pit are completed. The accumulated water is filtered and precipitated for multiple times through the filtering assembly, the first precipitation device and the second precipitation device, so that the accumulated water finally reaches the discharge standard and can be smoothly discharged to a municipal pipe well, the whole foundation pit dewatering and drainage process is broken through, and the foundation pit dewatering and drainage efficiency and effect are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of excavation, in particular to a foundation pit drainage and sedimentation system. Background Art

[0002] When constructing high-rise buildings, underground shopping malls, underground parking lots, subway stations, etc., it is often necessary to dig foundation pits to provide large spaces for workers, building materials, and construction machinery. However, when excavating foundation pits, once the groundwater level is higher than the bottom of the excavation, groundwater will continue to seep into the pit. In order to keep the foundation pit dry and prevent problems such as slope instability, pit bottom uplift, and reduced foundation bearing capacity, precipitation work must be carried out. This precipitation work is usually called foundation pit precipitation; foundation pit precipitation usually needs to be combined with drainage to achieve its precipitation purpose.

[0003] There are two main methods of foundation pit drainage commonly used. One is the open drainage method, which is to set a water collection well at the bottom of the pit, and to dig a drainage ditch around or in the center of the bottom of the pit, to introduce water into the water collection well, and then to pump the water away by a pump. However, this method does not treat the accumulated water. The accumulated water in the foundation pit usually contains a large amount of debris and suspended matter, which is far from meeting the discharge standards, and it is impossible to directly discharge the extracted accumulated water into the municipal pipe well. The other is the well point dewatering method. Before the foundation pit is excavated, a certain number of filter pipes (wells) are buried around the foundation pit in advance. The filter pipes (wells) extend downward, and pumping equipment is used to extract groundwater at this location, so that the groundwater around the foundation pit drops below the bottom of the foundation pit, and water is continuously pumped during the excavation of the foundation pit, so that the foundation pit is always kept dry. When there are public facilities such as buildings and roads around the foundation pit, it is impossible to bury a certain number of filter pipes (wells) around it, that is, the well point dewatering method cannot be used to dewater such foundation pits. Utility Model Content

[0004] The purpose of the utility model is to provide a foundation pit drainage sedimentation system to solve the problem in the prior art that when there are public facilities such as buildings and roads around the foundation pit, the accumulated water in the foundation pit extracted by the open drainage method does not meet the discharge standard.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a foundation pit drainage sedimentation system, including a foundation pit, a pumping device, and a water collection structure, a first sedimentation device, a second sedimentation device and a drainage ditch which are sequentially connected according to the flow direction of the foundation pit drainage;

[0006] The water collection structure is dug inside the foundation pit, and the first sedimentation device, the second sedimentation device and the drainage ditch are all arranged on the periphery of the foundation pit;

[0007] The water pumping device comprises a water pump, a first drainage pipe and a filter assembly, wherein the water pump is arranged in the water collecting structure, the water pump is connected with the first sedimentation device through the first drainage pipe, and the filter assembly cover is arranged on the outer periphery of the water pump;

[0008] The first sedimentation device is connected to the second sedimentation device through a second drainage pipe; the first sedimentation device is used to precipitate suspended matter in water;

[0009] The second sedimentation device is communicated with the drainage ditch through a third drainage pipe.

[0010] Furthermore, the water collection structure includes a plurality of water collection wells that are evenly arranged at intervals and interconnected, and the water pump is disposed in the water collection wells.

[0011] Furthermore, the filter assembly includes a filter screen and a filter frame, the water pump is arranged in the filter frame, and the filter screen is wrapped around the outer periphery of the filter frame.

[0012] Furthermore, the first precipitation device comprises a precipitation box, and a precipitant is installed in the precipitation box;

[0013] A first opening is provided on the top of the sedimentation tank, and the water outlet of the first drainage pipe is located above the first opening.

[0014] Furthermore, the second sedimentation device includes a first sedimentation tank, a second sedimentation tank and a third sedimentation tank which are connected in sequence, the sedimentation tank is connected to the first sedimentation tank through the second drainage pipe, and the third sedimentation tank is connected to the drainage ditch through the third drainage pipe.

[0015] Furthermore, the sedimentation box is located above the second sedimentation device; a first water outlet is opened on the upper part of the side wall of the sedimentation box, and the water inlet of the second drain pipe is connected to the first water outlet;

[0016] A second opening is provided on the top of the first sedimentation tank, and the water outlet of the second drainage pipe is connected to the second opening.

[0017] Furthermore, a first drainage hole is provided at an upper portion of a side wall connecting the first sedimentation tank and the second sedimentation tank, and a second drainage hole is provided at an upper portion of a side wall connecting the second sedimentation tank and the third sedimentation tank.

[0018] Furthermore, the volume of the sedimentation tank is greater than the sum of the volumes of the first sedimentation tank, the second sedimentation tank and the third sedimentation tank.

[0019] Furthermore, the first sedimentation device, the second sedimentation device and the drainage ditch are all arranged above the outer peripheral wall of the foundation pit, and the second sedimentation device is arranged between the first sedimentation device and the drainage ditch.

[0020] Furthermore, it also includes support piles, which are vertically arranged on the peripheral wall of the foundation pit;

[0021] The first drainage pipe includes a lifting section for conveying the accumulated water to the periphery of the foundation pit, the lifting section is arranged in parallel with the supporting piles, and the outer wall of the lifting section is connected to the supporting piles.

[0022] Compared with the prior art, the foundation pit drainage sedimentation system provided by the utility model has the following beneficial effects:

[0023] The utility model provides a foundation pit drainage and sedimentation system, which collects accumulated water in the foundation pit through a water collecting structure, and extracts the accumulated water through a pumping device and transports it to a first sedimentation device on the periphery of the foundation pit, and makes the accumulated water clear through multiple sedimentation by the first sedimentation device and the second sedimentation device to meet the discharge standard, and finally discharges the qualified water to the municipal pipe well through the drainage ditch; in addition, the filter assembly is arranged on the outer cover of the pumping device to filter large pieces of debris to avoid clogging the first drain pipe, thereby ensuring the drainage efficiency of the foundation pit drainage and sedimentation system, and further making the foundation pit drainage and sedimentation system have both functions of drainage and sedimentation of accumulated water, ensuring construction discharge and meeting the discharge standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a foundation pit drainage sedimentation device according to an embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A magnified schematic diagram of area A in the middle.

[0026] In the figure, 100, foundation pit drainage and sedimentation system; 10, foundation pit; 1, pumping device; 11, pumping pump; 12, first drainage pipe; 121, lifting section; 2, water collection structure; 21, water collection well; 3, first sedimentation device; 31, sedimentation box; 311, first opening; 312, first water outlet; 4, second sedimentation device; 41, first sedimentation tank; 411, second opening; 412, first drainage hole; 42, second sedimentation tank; 421, second drainage hole; 43, third sedimentation tank; 5, drainage ditch; 6, second drainage pipe; 7, third drainage pipe; 8, supporting piles. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figure 1As shown, a foundation pit drainage sedimentation system 100 of the utility model embodiment includes a foundation pit 10, a pumping device 1 and a drainage device 1 according to the foundation pit drainage flow direction ( Figure 1 The water collecting structure 2, the first sedimentation device 3, the second sedimentation device 4 and the drainage ditch 5 are connected in sequence (in the direction indicated by the arrow in the figure); the water collecting structure 2 is excavated in the foundation pit 10, and the first sedimentation device 3, the second sedimentation device 4 and the drainage ditch 5 are all arranged on the periphery of the foundation pit 10; the pumping device 1 includes a pumping pump 11, a first drain pipe 12 and a filter assembly (not shown in the figure), the pumping pump 11 is arranged in the water collecting structure 2, the pumping pump 11 is connected to the first sedimentation device 3 through the first drain pipe 12, and the filter assembly cover is arranged on the periphery of the pumping pump 11; the first sedimentation device 3 is connected to the second sedimentation device 4 through the second drain pipe 6; the first sedimentation device 3 is used to precipitate suspended matter in the water; the second sedimentation device 4 is connected to the drainage ditch 5 through the third drain pipe 7.

[0029] Based on the above technical scheme, the foundation pit drainage and sedimentation system 100 in this embodiment first collects the accumulated water in the foundation pit 10 through the water collection structure 2 arranged in the foundation pit 10, and then filters the debris in the accumulated water through the filtering component covered on the outer periphery of the pumping device 1, and the pump 11 transports the accumulated water to the first sedimentation device 3 through the first drainage pipe 12, and the first sedimentation device 3 is used to implement the first sedimentation of the accumulated water, and then the second sedimentation device 4 is used to precipitate the water treated by the first sedimentation device 3 again, and then the water precipitated again by the second sedimentation device 4 is transported to the drainage ditch 5 via the third drainage pipe 7, and finally the drainage ditch 5 discharges the water into the municipal pipe well.

[0030] Furthermore, if Figure 1 As shown, the water collection structure 2 includes a number of water collection wells 21 that are evenly arranged and interconnected. In this embodiment, the foundation pit excavated at the bottom of the foundation pit 10 is used as the water collection well 21; several of the water collection wells 21 are interconnected to balance the water levels between the water collection wells 21, to avoid excessive local water levels affecting the foundation pit 10, and several interconnected water collection wells 21 can form a drainage network, to improve drainage efficiency and reduce the installation of drainage equipment.

[0031] Furthermore, the filter assembly includes a filter screen and a filter frame, the water pump 11 is arranged in the filter frame, and the filter screen is wrapped around the outer periphery of the filter frame; the filter screen cover is arranged on the outer periphery of the water pump 11 to filter large debris in the accumulated water; the filter screen is supported by the filter frame so that the filter screen will not be sucked into the water inlet of the water pump 11 due to the extraction of the water pump 11 during the pumping process, thereby avoiding clogging of the water pump 11 and affecting the drainage efficiency.

[0032] Furthermore, if Figure 1 As shown, the first sedimentation device 3 includes a sedimentation box 31, in which a precipitant is installed. The precipitant reacts with the accumulated water to precipitate suspended matter in the accumulated water. A first opening 311 is provided on the top of the sedimentation box 31, and the outlet of the first drainage pipe 12 is located above the first opening 311. Therefore, the water pump 11 is connected to the sedimentation box 31 in one direction, and the accumulated water entering the sedimentation box 31 will not flow back through the first drainage pipe 12, thereby avoiding affecting the normal use of the water pump 11 and reducing the drainage efficiency.

[0033] Furthermore, if Figure 1 and Figure 2 As shown, the second sedimentation device 4 includes a first sedimentation tank 41, a second sedimentation tank 42 and a third sedimentation tank 43 which are connected in sequence, the sedimentation tank 31 is connected to the first sedimentation tank 41 through a second drain pipe 6, and the third sedimentation tank 43 is connected to the drainage ditch through a third drain pipe; the second sedimentation device 4 precipitates the water transported in multiple times through the first sedimentation tank 41, the second sedimentation tank 42 and the third sedimentation tank 43 and then discharges it into the drainage ditch 5.

[0034] Furthermore, if Figure 1 As shown, the sedimentation box 31 is located above the second sedimentation device 4; a first water outlet 312 is provided on the upper part of the side wall of the sedimentation box 31, and the water inlet of the second drain pipe 6 is connected to the first water outlet 312; a second opening 411 is provided on the top of the first sedimentation tank 41, and the water outlet of the second drain pipe 6 is connected to the second opening 411, so that the water after sedimentation in the sedimentation box 31 and the first sedimentation tank 41 passes through the first water outlet 312 and is transported by the second drain pipe 6 to the first sedimentation tank 41 located below the sedimentation box 31.

[0035] Furthermore, if Figure 2 As shown, a first drainage hole 412 is provided at the upper portion of the side wall connecting the first sedimentation tank 41 and the second sedimentation tank 42, and a second drainage hole 421 is provided at the upper portion of the side wall connecting the second sedimentation tank 42 and the third sedimentation tank 43, so that the water entering the first sedimentation tank 41 can be naturally precipitated, and flow into the second sedimentation tank 42 through the first drainage hole 412, and then flow into the third sedimentation tank 43 through the second drainage hole 421 after natural sedimentation in the second sedimentation tank 42; and the self-flow design eliminates the need to use additional mechanical equipment for water extraction and transportation, thereby reducing the use cost.

[0036] Furthermore, if Figure 1As shown, the volume of the sedimentation tank 31 is greater than the sum of the volumes of the first sedimentation tank 41, the second sedimentation tank 42 and the third sedimentation tank 43; this facilitates the precipitant in the sedimentation tank 31 to fully react with the accumulated water to precipitate and remove most of the suspended matter in the accumulated water, thereby reducing the overall processing load of the second sedimentation device 4 and improving the processing efficiency and water quality of the entire foundation pit drainage sedimentation system 100.

[0037] Furthermore, if Figure 1 As shown, the first sedimentation device 3, the second sedimentation device 4 and the drainage ditch 5 are all arranged above the outer peripheral wall of the foundation pit 10, so as to be connected with public drainage equipment such as municipal pipe wells on the ground, and the second sedimentation device 4 is arranged between the first sedimentation device 3 and the drainage ditch 5 to prevent the drainage ditch 5 from overflowing onto the road or surrounding buildings.

[0038] Furthermore, if Figure 1 As shown, it also includes supporting piles 8, which are vertically arranged on the peripheral wall of the foundation pit 10; in addition to stabilizing the soil to prevent landslides or collapses caused by excavation, the supporting piles 8 are beneficial to reducing the pressure of groundwater around the foundation pit 10 on the foundation pit 10; the first drainage pipe 12 includes a lifting section 121 for transporting the accumulated water to the periphery of the foundation pit 10, and the lifting section 121 is arranged parallel to the supporting piles 8, and the outer wall of the lifting section 121 is connected to the supporting piles 8 to maintain the stability of the first drainage pipe 12 to prevent it from falling sideways and being damaged, thereby affecting the drainage efficiency.

[0039] The working process of the utility model is as follows: Figure 1 As shown, the groundwater around the foundation pit 10 seeps into the foundation pit 10 under the action of water pressure, and is collected into the water collection well 21 under the action of the water's own weight. Several of the water collection wells 21 are interconnected to balance the water level and avoid excessive local water level. The pump 11 extracts the accumulated water in the water collection well 21, and filters out large pieces of water, debris and suspended matter in the accumulated water through the filter net in the filter assembly to avoid clogging the pump 11 and affecting the drainage efficiency. The pump 11 transports the accumulated water to the sedimentation tank 31 through the first drainage pipe 12. Most of the suspended matter in the accumulated water is precipitated and removed by the precipitant in the sedimentation tank 31, and the water is transported to the second sedimentation device 4 through the second drainage pipe 6. The suspended matter in the water is further precipitated and removed through multi-stage sedimentation of the first sedimentation tank 41, the second sedimentation tank 42 and the third sedimentation tank 43, so that the water finally meets the discharge standard, and the treated water is transported to the drainage ditch 5 through the third drainage pipe 7, and the drainage ditch 5 transports the treated water to the municipal pipe well connected thereto, thereby completing the entire foundation pit drainage process.

[0040] In summary, the embodiment of the utility model provides a foundation pit drainage and sedimentation system 100, which includes a pumping device 1 and a water collection structure 2, a first sedimentation device 3, a second sedimentation device 4 and a drainage ditch 5 which are connected in sequence according to the foundation pit drainage flow direction. The accumulated water in the foundation pit 10 is collected in the water collection well 21 in the water collection structure 2 and then pumped and transported to the first sedimentation device 3 by the pumping pump 11. After the first sedimentation is carried out in the first sedimentation device 3, it is transported to the second sedimentation device 4 for sedimentation again. Finally, the filtered and precipitated water is transported to the drainage ditch 5, and the drainage ditch 5 discharges the treated water into the municipal pipe well. In the filtering and sedimentation process of the accumulated water, the filter mesh in the filter assembly filters out large debris in the accumulated water, and the sedimentation box 31 uses a precipitant to precipitate most of the suspended matter in the accumulated water. The first sedimentation tank 41, the second sedimentation tank 42 and the third sedimentation tank 43 further perform multi-stage sedimentation on the water, so that the accumulated water finally meets the discharge standard, thereby ensuring that it can be smoothly discharged to the municipal pipe well and ensuring the smoothness of the drainage passage.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A foundation pit drainage sedimentation system, comprising a foundation pit, characterized in that: It also includes a pumping device and a water collection structure, a first sedimentation device, a second sedimentation device and a drainage ditch which are sequentially connected according to the drainage direction of the foundation pit; The water collection structure is excavated in the foundation pit, and the first sedimentation device, the second sedimentation device and the drainage ditch are all arranged on the periphery of the foundation pit; The water pumping device comprises a water pump, a first drainage pipe and a filter assembly, wherein the water pump is arranged in the water collecting structure, the water pump is connected with the first sedimentation device through the first drainage pipe, and the filter assembly cover is arranged on the outer periphery of the water pump; The first sedimentation device is connected to the second sedimentation device through a second drainage pipe; the first sedimentation device is used to precipitate suspended matter in water; The second sedimentation device is communicated with the drainage ditch through a third drainage pipe.

2. The foundation pit drainage sedimentation system according to claim 1, characterized in that: The water collection structure comprises a plurality of water collection wells which are evenly arranged and interconnected, and the water pump is arranged in the water collection wells.

3. The foundation pit drainage sedimentation system according to claim 1, characterized in that: The filter assembly comprises a filter screen and a filter frame, the water pump is arranged in the filter frame, and the filter screen is wrapped around the outer periphery of the filter frame.

4. The foundation pit drainage sedimentation system according to claim 1, characterized in that: The first precipitation device comprises a precipitation box, in which a precipitant is installed; A first opening is provided on the top of the sedimentation tank, and the water outlet of the first drainage pipe is located above the first opening.

5. The foundation pit drainage sedimentation system according to claim 4, characterized in that: The second sedimentation device comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank which are connected in sequence. The sedimentation tank is connected to the first sedimentation tank through the second drainage pipe, and the third sedimentation tank is connected to the drainage ditch through the third drainage pipe.

6. The foundation pit drainage and sedimentation system according to claim 5, characterized in that: The sedimentation box is located above the second sedimentation device; a first water outlet is opened on the upper part of the side wall of the sedimentation box, and the water inlet of the second drainage pipe is connected to the first water outlet; A second opening is provided on the top of the first sedimentation tank, and the water outlet of the second drainage pipe is connected to the second opening.

7. The foundation pit drainage sedimentation system according to claim 5, characterized in that: A first drainage hole is provided at the upper portion of the side wall connecting the first sedimentation tank and the second sedimentation tank, and a second drainage hole is provided at the upper portion of the side wall connecting the second sedimentation tank and the third sedimentation tank.

8. The foundation pit drainage sedimentation system according to claim 5, characterized in that: The volume of the sedimentation tank is greater than the sum of the volumes of the first sedimentation tank, the second sedimentation tank and the third sedimentation tank.

9. The foundation pit drainage sedimentation system according to claim 1, characterized in that: The first sedimentation device, the second sedimentation device and the drainage ditch are all arranged above the outer peripheral wall of the foundation pit, and the second sedimentation device is arranged between the first sedimentation device and the drainage ditch.

10. The foundation pit drainage sedimentation system according to claim 9, characterized in that: It also includes support piles, which are vertically arranged on the peripheral wall of the foundation pit; The first drainage pipe includes a lifting section for conveying the accumulated water to the periphery of the foundation pit, the lifting section is arranged in parallel with the supporting piles, and the outer wall of the lifting section is connected to the supporting piles.

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