CN212153429U

CN212153429U - Deep foundation pit dewatering well structure

Info

Publication number: CN212153429U
Application number: CN202020691285.9U
Authority: CN
Inventors: 杨洋; 李林; 邱长林
Original assignee: China Metallurgical Construction Engineering Group Co Ltd
Current assignee: China Metallurgical Construction Engineering Group Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-12-15
Anticipated expiration: 2030-04-29

Abstract

The utility model discloses a deep foundation pit precipitation well structure, which comprises a foundation pit foundation and a water filtering well pipe arranged in the foundation pit foundation, wherein a filter material layer is filled between the outer wall of the water filtering well pipe and the foundation pit foundation; an inner filter cylinder is also arranged in the water filtering well pipe, the lower end of the inner filter cylinder is positioned above the bottom of the water filtering well pipe, a plurality of water filtering holes are circumferentially arranged on the inner filter cylinder, and a layer of filter screen with the same height as the inner filter cylinder is wrapped outside the inner filter cylinder; the inner filter cylinder is internally provided with a drainage pump which discharges water outwards. The utility model discloses the deep basal pit precipitation well structure that obtains filter effect is good, and the cost is low.

Description

Deep foundation pit dewatering well structure

Technical Field

The utility model relates to a foundation ditch dewatering civil engineering technical field, concretely relates to deep basal pit dewatering well structure.

Background

The foundation pit dewatering method mainly comprises a sump dewatering method and a well point dewatering method, wherein the well point dewatering method has the advantages of being large in water discharge, large in dewatering depth (15-50 m), free of limitation of soil quality and the like, and is suitable for engineering underground dewatering with abundant underground water, foundation pit depth (larger than 10m) and large foundation pit occupied area. The well point dewatering method is a construction process that a certain number of dewatering wells are constructed around a foundation pit before the foundation pit is excavated, water filters (wells) are welded at the lower parts of the dewatering wells, and underground water in the wells is pumped out by using pumping equipment so that the excavated soil is always kept in a dry state.

The existing precipitation well mainly comprises a well pipe and a strainer pipe, wherein the strainer pipe is filled with a plurality of filter layers, a filter is arranged between the strainer pipe and a foundation pit base, and when the precipitation well is used, water in the strainer pipe is pumped out through a drainage pump (for example, a deep foundation pit precipitation well structure with the application number of 201720467394.0). The water strainer is a precast concrete pipe, a plurality of holes are formed in the precast concrete pipe at intervals, and water around the precipitation well enters the precipitation well through the holes. The problem that the prefabricated concrete pipe is used as a water filter pipe is poor in filtering effect and high in manufacturing cost. Meanwhile, the existing filter layers mainly filter underground water through the multiple filter layers in the filter water pipe, the filter effect is poor, and the situation that well water is turbid can exist due to continuous inflow of water, so that the blockage of a drainage pump is easily caused, and the drainage effect is influenced.

Disclosure of Invention

To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: how to provide a deep basal pit precipitation well structure that filter effect is good, and the cost is low.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a deep foundation pit dewatering well structure comprises a foundation pit foundation and a water filtering well pipe arranged in the foundation pit foundation, wherein a filter material layer is filled between the outer wall of the water filtering well pipe and the foundation pit foundation; an inner filter cylinder is also arranged in the water filtering well pipe, the lower end of the inner filter cylinder is positioned above the bottom of the water filtering well pipe, a plurality of water filtering holes are circumferentially arranged on the inner filter cylinder, and a layer of filter screen with the same height as the inner filter cylinder is wrapped outside the inner filter cylinder; the inner filter cylinder is internally provided with a drainage pump which discharges water outwards. Like this, the strainer that adopts is the steel reinforcement cage, because the steel reinforcement cage is formed by many vertical reinforcing bars and the welding of horizontal stirrup, has great clearance itself, provides favorable guarantee for the mediation of groundwater. Meanwhile, the reinforcement cage is high in strength, can protect the interior of the internal filter cylinder and prevent the internal filter cylinder from being broken due to overlarge earthwork side pressure of the wall of the pile hole. In addition, the reinforcement cage can be directly pulled out and then recycled at the later stage, and the manufacturing cost of the reinforcement cage is lower than that of a precast concrete pipe. And the first cartridge filter and the second cartridge filter that set up outside the steel reinforcement cage can avoid interior cartridge filter to be blockked up outside the steel reinforcement cage with great impurity separation. The filtering layer arranged on the inner filtering cylinder can filter small impurities, so that the impurities in the middle of underground water entering the inner filtering cylinder are less, and the filtering holes in the corrugated pipe cannot be blocked. The multiple filtration mode can effectively avoid blockage caused by sludge formed at the bottom of the dewatering well.

Furthermore, a horizontally arranged steel bar mesh is fixedly arranged in the steel bar cage, and the inner filter cylinder is arranged on the steel bar mesh. Like this, the reinforcing bar net piece that sets up can provide the support for interior filter cartridge, and simultaneously, the reinforcing bar net piece can also filter the water of drainage well bottom, prevents that great impurity from entering into in the drain pump.

Furthermore, at least one crushed stone layer is arranged on the reinforcing mesh sheet and below the drainage pump, and the crushed stone layer is a large particle crushed stone layer or/and a medium particle crushed stone layer or/and a small particle crushed stone layer. Therefore, the gravel layer can filter underground water entering the inner filter cylinder again, and further prevents impurities from entering the drainage pump to block the drainage pump.

Furthermore, the inner filter cylinder is a corrugated pipe with the diameter smaller than the inner diameter of the water filtering well pipe, and the upper end of the inner filter cylinder is flush with the upper end of the water filtering well pipe. Therefore, the corrugated pipe is low in manufacturing cost and convenient to cut during later sealing.

Furthermore, the distance between two adjacent water filtering holes on the inner filter cylinder is 50mm-100 mm. Like this, the water filtering holes set up rationally on the bellows, can not cause great influence to the intensity of bellows, simultaneously, the water filtering holes quantity that sets up can satisfy passing through of groundwater rivers.

Furthermore, the filter screen is the wire net, is the tube-shape. Like this, adopt the wire net as the filter screen, its intensity is high, and the wire net twines the back on the bellows, can effectively promote the intensity of bellows.

Furthermore, the first filter cylinder is formed by bending a thin steel plate into a cylindrical shape and then fixing the thin steel plate, and a plurality of through holes are formed in the thin steel plate and are circumferentially distributed on the thin steel plate in a grid shape; the second filter cylinder is made of non-woven fabrics. Like this, steel sheet net itself adopts the steel sheet preparation to form, establishes latticed hole on, the hole can filter great impurity, and the non-woven fabrics can filter less impurity. Meanwhile, when underground water is large, the steel plate net can slow down the water flow speed, and further reduce the water flow impact force on the inner filter cylinder.

Furthermore, two lifting rings are fixed at the top end of the steel reinforcement cage, and the steel reinforcement cage penetrates through the two lifting rings through a horizontal support and then stands in the foundation pit. Like this, the steel reinforcement cage stands in the stake is downthehole through the horizontal support, can prevent that the steel reinforcement cage from sinking because gravity is too big.

Drawings

FIG. 1 is a schematic view of an installation structure of a dewatering well in the embodiment;

FIG. 2 is a partial enlarged structural diagram of a dewatering well in the embodiment.

In the figure: strainer 1, steel reinforcement cage 11, reinforcing bar net 12, first cartridge filter 13, second cartridge filter 14, rings 15, horizontal support 16, bellows 2, filter layer 3, filter bed 4, rubble layer 5, drain pump 6.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example (b):

the deep foundation pit dewatering well structure provided by the embodiment comprises a foundation pit foundation and a water filtering well pipe 1 arranged in the foundation pit foundation, wherein a filter material layer 4 is filled between the outer wall of the water filtering well pipe 1 and the foundation pit foundation; the water filtering well pipe 1 comprises a reinforcement cage 11, and a first filter cylinder 13 and a second filter cylinder 14 which are sequentially arranged outside the reinforcement cage 11, wherein a horizontally arranged reinforcement mesh 12 is fixedly arranged in the reinforcement cage 11 (the distance between the reinforcement mesh 12 and the bottom of the reinforcement cage is 500-800 mm); an inner filter cylinder 2 is further arranged in the water filtering well pipe 1, the inner filter cylinder 2 is arranged on a steel bar net 12 (namely, the lower end of the inner filter cylinder 2 is positioned on the bottom of the water filtering well pipe), a plurality of water filtering holes are circumferentially arranged on the inner filter cylinder 2, a layer of filter screen 3 with the same height as the inner filter cylinder 2 is further wrapped outside the inner filter cylinder 2, and the filter screen 3 is a steel wire mesh and is cylindrical; a water discharge pump 6 is arranged in the inner filter cylinder 2.

At least one gravel layer 5 is further arranged on the reinforcing mesh 12 and below the drainage pump 6, and the gravel layer 5 is a large particle gravel layer or/and a medium particle gravel layer or/and a small particle gravel layer.

Specifically, the inner filter cylinder 2 is a corrugated pipe with a diameter smaller than the inner diameter of the water filtering well pipe, and the upper end of the inner filter cylinder 2 is flush with the upper end of the water filtering well pipe 1. The distance between two adjacent water filtering holes on the inner filter cylinder 2 is 50mm-100 mm.

The first filter cartridge 13 in this embodiment is formed by bending a thin steel plate into a cylindrical shape and fixing the bent thin steel plate, and a plurality of through holes are formed in the thin steel plate and are circumferentially distributed in a grid shape; the second filter cartridge 14 is made of non-woven fabric.

Two lifting rings 15 are fixed at the top end of the reinforcement cage 11, and the reinforcement cage 11 penetrates through the two lifting rings 15 through a horizontal support 16 and then stands in a foundation pit foundation.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the applicant has described the present invention in detail with reference to the preferred embodiments, those skilled in the art should understand that those modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.

Claims

1. A deep foundation pit dewatering well structure comprises a foundation pit foundation and a water filtering well pipe (1) arranged in the foundation pit foundation, wherein a filter material layer (4) is filled between the outer wall of the water filtering well pipe (1) and the foundation pit foundation, and the deep foundation pit dewatering well structure is characterized in that the water filtering well pipe (1) comprises a reinforcement cage (11) and a first filter cartridge (13) and a second filter cartridge (14) which are sequentially arranged outside the reinforcement cage (11); an inner filter cylinder (2) is further arranged in the water filtering well pipe (1), the lower end of the inner filter cylinder (2) is positioned above the bottom of the water filtering well pipe, a plurality of water filtering holes are circumferentially formed in the inner filter cylinder (2), and a layer of filter screen (3) which is as high as the inner filter cylinder is wrapped outside the inner filter cylinder (2); a drainage pump (6) which drains water outwards is arranged in the inner filter cylinder (2).

2. The deep foundation pit dewatering well structure according to claim 1, wherein a horizontally arranged reinforcing mesh (12) is fixedly installed in the reinforcing cage (11), and the inner filter cartridge (2) is placed on the reinforcing mesh (12).

3. The deep foundation pit dewatering well structure according to claim 2, characterized in that at least one gravel layer (5) is further arranged on the steel mesh (12) and below the drainage pump (6), and the gravel layer (5) is a large particle gravel layer or/and a medium particle gravel layer or/and a small particle gravel layer.

4. The deep foundation pit dewatering well structure according to claim 1, 2 or 3, characterized in that the inner filter cylinder (2) is a corrugated pipe with a diameter smaller than the inner diameter of the drainage well pipe, and the upper end of the inner filter cylinder (2) is flush with the upper end of the drainage well pipe (1).

5. The deep foundation pit dewatering well structure according to claim 4, characterized in that the distance between two adjacent water filtering holes on the inner filter cylinder (2) is 50mm-100 mm.

6. The deep foundation pit dewatering well structure according to claim 1, wherein the filter screen (3) is a steel wire mesh and is cylindrical.

7. The deep foundation pit dewatering well structure according to claim 1, wherein the first filter cartridge (13) is formed by bending a thin steel plate into a cylindrical shape and fixing the bent thin steel plate, and a plurality of through holes are formed in the thin steel plate and are circumferentially distributed on the thin steel plate in a grid shape; the second filter cartridge (14) is made of non-woven fabrics.

8. The deep foundation pit dewatering well structure according to claim 1, wherein two lifting rings (15) are fixed at the top end of the reinforcement cage (11), and the reinforcement cage (11) penetrates through the two lifting rings (15) through a horizontal support (16) and then stands in the foundation pit.