CN217630033U - Steel strainer deep foundation pit dewatering device - Google Patents

Abstract

The utility model discloses a steel strainer deep basal pit dewatering device, including setting up a plurality of dewatering well at elevartor shaft bottom periphery, dewatering well extends to contains water layer bottom elevation below from raft bottom elevation height place downward, and dewatering well includes gravel packing layer and steel strainer from outside-in, and the built-in water pump that draws water of steel strainer, water pump set up in containing water layer bottom elevation below 1-2 meters department, and water pump extends dewatering well top and is connected with outside drainage system through the drain pipe that upwards sets up. The utility model discloses utilize the steel strainer pipe as the drainage media, its outside sets up gravel packing layer secondary filter with aquifer contact position, and inside sets up water pump and realizes the negative pressure environment, makes the water of aquifer inside from outside inflow steel strainer pipe to discharge from bottom to top through water pump. Because the utility model is used for local precipitation compares in the large tracts of land precipitation of foundation ditch, for improving precipitation efficiency, needs each highly to make further restriction to precipitation well.

Description

Steel strainer deep foundation pit dewatering device

Technical Field

The utility model relates to an engineering construction technical field, more specifically say, relate to a steel strainer pipe deep basal pit dewatering device.

Background

Due to the shortage of urban land, deep foundation pits, super high-rise buildings and the like are developed to adapt to the urbanization process. However, when the depth of the foundation pit is increased, the precipitation difficulty of the foundation pit is gradually increased, and particularly in cities with large precipitation and abundant lake groundwater such as the south, the precipitation difficulty is increased in the construction process of the foundation pit, so that the engineering progress is seriously influenced, and engineering accidents are easily caused. And because precipitation construction cost is higher, the construction unit can adjust the deep foundation pit precipitation engineering with the order of earthwork excavation, pile foundation construction mutually, carry out earthwork excavation, pile foundation construction earlier, carry out precipitation construction again, this just leads to local precipitation to can't satisfy the requirement easily, especially like elevator well pit etc. low place, the waterline still can't satisfy the construction requirement of local low-lying parts such as elevator well pit, sump pit after large tracts of land precipitation, seriously influences follow-up work, makes the time limit for a project extension.

The above disadvantages need to be improved.

Disclosure of Invention

In order to overcome the deficiencies of the prior art, the utility model provides a steel strainer pipe deep basal pit precipitation device.

The utility model discloses technical scheme as follows:

the utility model provides a steel strainer deep basal pit dewatering device, is including setting up a plurality of precipitation well at elevator shaft bottom of a pit periphery, the precipitation well extends to below contains water layer bottom elevation place from raft bottom elevation place downward, the precipitation well includes gravel packing layer, filter screen and steel strainer from outside-in, the built-in water pump that draws water of steel strainer, water pump sets up contain water layer bottom elevation place below 1-2 meters department, water pump extends through the drain pipe that upwards sets up precipitation well top and with outside drainage headtotail.

In the deep foundation pit dewatering device for the steel water filter pipes, the thickness of the gravel packing layer is 100 mm.

The steel strainer deep foundation pit dewatering device is characterized in that the outer diameter of the steel strainer is 600 millimeters, and the thickness of the steel strainer is 5 millimeters.

The deep foundation pit dewatering device for the steel water filter pipes is characterized in that a pipe well mouth protection structure is arranged at the mouth of the dewatering well.

Further, the tube well mouth protective structure comprises a steel well lid and a protective cover, the steel well lid covers and seals the pipe orifice of the steel water filter pipe, the protective cover is arranged on the gravel packing layer and the edge of the protective cover is flush with the edge of the gravel packing layer.

Further, the top of the protective cover is arranged 300 mm above the elevation of the raft bottom.

Foretell steel strainer deep basal pit dewatering device, each the elevator shaft bottom is peripheral to be set up threely the dewatering well, preferably, the dewatering well is triangular distribution.

The water level line before the precipitation is located above the elevation positions at the bottom of the elevator shaft pit, the water level line after the precipitation is distributed in a wavy manner, and the highest position of the water level line after the precipitation is greater than 500 millimeters from the elevation positions at the bottom of the elevator shaft pit.

The steel strainer deep foundation pit precipitation device is characterized in that the top of the steel strainer is higher than the top of the gravel packing layer, and the bottom of the steel strainer is flush with the bottom of the gravel packing layer.

The deep foundation pit dewatering device for the steel water filter pipes is characterized in that a bottom steel sealing plate is arranged at the bottom of each steel water filter pipe, and a plurality of anti-floating holes are formed in the bottom steel sealing plate.

According to the above scheme the utility model discloses, its beneficial effect lies in, the utility model provides a local precipitation device of deep basal pit utilizes the steel drainpipe as the drainage media, and its outside sets up gravel packing layer secondary filter with aquifer contact position, and inside sets up water-suction pump and realizes the negative pressure environment, makes the water of aquifer inside from outside inflow steel drainpipe to discharge from bottom to top through water-suction pump. Because the utility model is used for local precipitation compares in the large tracts of land precipitation of foundation ditch, for improving precipitation efficiency, guarantees that the low water level descends to qualified waterline department, need highly make further restriction to each of precipitation well to full play water pump's negative pressure effect makes the groundwater of aquifer can descend smoothly, and the decline of waterline can be guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a sectional structure of a dewatering well of an elevator pit.

Fig. 2 is a schematic structural view of the dewatering well.

Wherein, in the figures, the respective reference numerals:

1. a dewatering well; 11. a gravel packing layer; 12. steel strainer pipes; 13. a water pump; 14. a pipe well mouth protection structure; 15. a drain pipe;

2. the bottom of the raft is raised; 3. elevation of the bottom of the elevator shaft; 4. water line before precipitation; 5. water line after precipitation.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "disposed" or "connected" to another element, it can be directly or indirectly disposed on the other element. The terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and should not be construed as limiting the technical solution. The meaning of "a number" is one or more unless specifically limited otherwise.

A steel strainer deep foundation pit dewatering device is shown in figure 1 and comprises a plurality of dewatering wells 1 arranged on the periphery of an elevator shaft bottom, wherein the dewatering wells 1 extend downwards from a raft bottom elevation position 2 to the position below a water-bearing layer bottom elevation position, the dewatering wells 1 comprise gravel packing layers 11, filter screens and steel strainers 12 from outside to inside, water pumps 13 are arranged in the steel strainers 12, the water pumps 13 are arranged at 1-2 meters below the water-bearing layer bottom elevation position, and drain pipes 15 arranged on the water pumps 13 in the warp direction extend out of the dewatering wells 1 and are connected with an external drainage system.

Specifically, after large-area precipitation is completed, after the tube well precipitation reaches certain balance, pit is excavated around the sudden-falling parts such as elevator pit, sump pit and the like with water level lines still not meeting construction requirements, and the precipitation well 1 is arranged downwards from the raft. In this embodiment, three dewatering wells 1 are arranged around the bottom of each elevator shaft, so that the dewatering wells 1 are distributed in a triangular manner from the top view angle and are uniformly distributed around the bottom of the elevator shaft.

As shown in fig. 2, in the precipitation well 1, a steel strainer 12 is used as a main water filtration path instead of a conventional sand-free concrete strainer. Compared with a sand-free concrete water filter pipe, the steel water filter pipe 12 is good in rigidity, low in adhesion to liquid such as water and high in processing controllability of surface water filter holes, and water in a water-containing layer around the dewatering well 1 can be timely pumped away through the water pump 13 by matching with a negative pressure environment formed by the water pump 13, so that the effect of a water pumping funnel is formed, and the water level line of the water-containing layer can be smoothly and efficiently lowered. According to the required depth of precipitation, the steel water filter pipes 12 can be welded, spliced and lengthened through the annular steel plates, and the annular steel plates coat the surfaces of the upper and lower sections of steel water filter pipes 12 and are welded and fixed, so that the required depth of precipitation is met.

On the other hand, in order to prevent the water filter holes of the steel strainer 12 from being plugged by the aquifer sand, the gravel packing layer 11 is provided on the outside of the steel strainer 12, and the outside of the steel strainer 12 is covered with gravel. The gravel packing layer 11 can also play a role of water filtration to prevent the entering and interference of sand and stones. In addition, a nylon filter screen is arranged between the gravel packing layer 11 and the steel water filter pipe 12 to further isolate sand.

In one embodiment, the gravel pack 11 has a thickness of 100 mm and a gravel diameter in the range of 3-10 mm is used.

In one embodiment, the steel strainer 12 has an outer diameter of 600 mm and a thickness of 5 mm.

Set up the steel shrouding in the bottom of steel strainer 12 and seal, inside the bottom welded connection of steel strainer 12, avoid mud and debris to get into the tube well, set up a plurality of anti hole of floating on the steel shrouding, avoid steel strainer 12 to float in the tube well because of groundwater drives.

The water pump 13 is hung inside the steel strainer 12, and the water pump 13 forms a negative pressure environment at the bottom of the steel strainer 12 to force water containing a water layer to enter the steel strainer 12. The water pump 13 is communicated with a drain pipe 15, and the drain pipe 15 extends to the outside of the steel strainer pipe 12 from bottom to top and is communicated with a drainage system on the edge of the foundation pit.

The wellhead of precipitation well 1 is provided with tube well wellhead protective structure 14, mainly plays the emergence that prevents the top accident that drops, protects constructor safety and the normal work of water pump 13 in the steel strainer 12. In one embodiment, the pipe diameter wellhead protective structure includes only a steel manhole cover for plugging the mouth of the steel strainer 12. In another embodiment, the tube well mouth protecting structure 14 includes a steel well cover and a protecting cover, the steel well cover covers and seals the pipe mouth of the steel water filtering tube 12, the protecting cover is arranged on the gravel packing layer 11, and the edge of the protecting cover is flush with the edge of the gravel packing layer 11.

In one embodiment, the top of the protective cover is positioned 300 mm above the raft bottom elevation 2.

Due to the requirement of local precipitation, structures in the precipitation well 1 have certain height limitation, and compared with the requirement of large-area precipitation, the requirement of the heights of the precipitation well 1 for the local precipitation is lower. The top height of gravel packing layer 11 and valve plate bottom elevation parallel and level, the top of steel strainer 12 is higher than the top of gravel packing layer 11, the bottom of steel strainer 12 and the bottom parallel and level of gravel packing layer 11, tube well head protective structure 14 highly is higher than raft bottom elevation 2, the top of steel strainer 12, the top of gravel packing layer 11, valve plate bottom elevation and tube well head protective structure 14 all are far above 3 or the sump bottom elevation 3. The bottom of the steel strainer 12 is 1-2 m lower than the bottom of the aquifer, and the water pump 13 is also 1-2 m lower than the bottom of the aquifer.

After the steel strainer 12 is installed, the water pump 13 pumps water for 20-24 hours, so that water in the aquifer around the elevator shaft pit or the water collecting pit can be pumped away in time, and the effect of a water pumping funnel is formed. In a concrete embodiment, the water level 4 before precipitation is above the elevation 3 at the bottom of the elevator shaft, and after precipitation in the precipitation well 1, the water level 5 after precipitation is in a wave-like distribution, the water level near the precipitation well 1 is low, the lowest part is almost consistent with the elevation at the bottom of the aquifer, and the highest part is below the center of the elevator shaft bottom or the sump. In the embodiment, after 20-24 hours of pumping water and precipitation, the distance between the highest position of the water line 5 after precipitation and the elevation position 3 of the bottom of the elevator shaft pit is more than 500 mm, and the operation requirement of the foundation pit operation surface below 0.5 m is met.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (8)

1. The utility model provides a steel strainer deep basal pit dewatering device, its characterized in that, including setting up a plurality of precipitation well at elevartor shaft bottom periphery, the well head department of precipitation well is provided with tube well mouth protective structure, the precipitation well extends to water layer bottom elevation below from raft bottom elevation downwards, the precipitation well is from outside-in including gravel packing layer, filter screen and steel strainer, the built-in water pump that draws water of steel strainer, water pump sets up water layer bottom elevation below 1-2 meters department, water pump extends through the drain pipe that upwards sets up the precipitation well top and with outside drainage system connection, the bottom of steel strainer sets up the bottom steel shrouding, set up a plurality of anti-floating hole on the steel shrouding of bottom.

2. The steel strainer deep foundation pit precipitation device of claim 1, wherein the gravel packing layer has a thickness of 100 mm.

3. The water reducing device of the steel strainer pipe deep foundation pit as claimed in claim 1, wherein the steel strainer pipe has an outer diameter of 600 mm and a thickness of 5 mm.

4. The device of claim 1, wherein the well head protection structure comprises a steel well lid and a protection cover, the steel well lid covers and seals the opening of the steel strainer, the protection cover is disposed on the gravel packing layer, and the edge of the protection cover is flush with the edge of the gravel packing layer.

5. The steel strainer deep foundation pit precipitation device of claim 4, wherein the top of the protective cover is arranged 300 mm above the elevation of the bottom of the raft.

6. The steel strainer deep foundation pit dewatering device of claim 1, wherein three dewatering wells are arranged around the bottom of each elevator shaft, and the dewatering wells are distributed in a triangular manner.

7. The steel strainer deep foundation pit dewatering device of claim 1, wherein the water level line before dewatering is located above the elevation of the elevator hoistway bottom, the water level line after dewatering is distributed in a wave shape, and the distance between the highest position of the water level line after dewatering and the elevation of the elevator hoistway bottom is greater than 500 mm.

8. The deep foundation pit dewatering apparatus of claim 1, wherein the top of the steel strainer is higher than the top of the gravel packing layer, and the bottom of the steel strainer is flush with the bottom of the gravel packing layer.

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