CN214363573U

CN214363573U - Dewatering device with submersible pump reserved in dredging well during raft foundation construction

Info

Publication number: CN214363573U
Application number: CN202120501953.1U
Authority: CN
Inventors: 姜文富; 孟燕; 侯芳; 孙文来
Original assignee: Shandong Building Material Survey And Mapping Research Institute Co ltd
Current assignee: Shandong Building Material Survey And Mapping Research Institute Co ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-10-08
Anticipated expiration: 2031-03-09

Abstract

The utility model discloses a during raft foundation construction dredge well and keep away immersible pump precipitation device mainly relates to building foundation ditch construction and precipitation engineering construction, foundation engineering construction etc.. The drainage system is characterized by comprising a drainage well, wherein a submersible pump is arranged below the drainage well, a water outlet of the submersible pump is connected with a drainage pipe, a reserved water pipe is further arranged in the drainage well, a well plugging steel pipe is arranged at the mouth of the drainage well, and the drainage pipe and the reserved water pipe are led out of the upper part of the drainage well. The beneficial effects of the utility model reside in that: it can guarantee to dredge the normal use of drawing water of immersible pump in the well, does not hinder raft foundation lower part waterproofing membrane simultaneously and lays subsides, raft foundation reinforcement and raft foundation concrete placement construction to can seal the well in advance promptly in raft foundation construction stage, need not wait to close the well when dredging well precipitation task finishes.

Description

Dewatering device with submersible pump reserved in dredging well during raft foundation construction

Technical Field

The utility model relates to a building foundation ditch construction and precipitation engineering construction, foundation engineering construction field, especially raft foundation construction field specifically are immersible pump precipitation device is kept away to dry well during raft foundation construction.

Background

According to the technical specification for supporting foundation pits of buildings (JGJ 120-2012), in areas with shallow underground water level and abundant underground water, when the soil is silt, sandy soil and gravelly soil with the permeability coefficient of 0.1-200 m/d, the tube well is subjected to precipitation as an applicable method. The excavation supporting and precipitation construction of the building foundation pit are the guarantee and the premise of the smooth construction of a foundation, in particular a raft foundation. In general, after the construction of the waterproof curtain and the early-stage support of the foundation pit is finished, the earthwork excavation and the later-stage layered support of the foundation pit must be carried out along with reasonable foundation pit precipitation.

The dewatering well undertakes the main dewatering task of the bottom range of the raft foundation, and provides necessary construction conditions without underground water for raft foundation construction. Particularly, when partial drain wells are distributed on the local strong permeable layer and the water guide channel, the drain task is more obvious. Once the pumping of these dribbling wells has been out of order temporarily, the rise in water level will threaten the stability of the rafts under construction in a very short time, causing irreparable damage and loss.

When the design and site selection of the dry well are carried out, the position below the raft foundation for conveniently sealing the well is not available, so that the dry well is usually arranged from the beginning and inevitably becomes a large obstacle for the construction of the raft foundation. The well mouth of the drainage well occupies the space of raft construction or even main structure construction for a long time. The large raft foundation is not poured all at once, and is usually constructed in sections, even when the first construction section reaches the columns, the walls, the beams and other structures, the later construction section does not pour the raft foundation, so that in order to ensure the stability of the foundation pit and the foundation and prevent uneven settlement, the whole foundation pit range still needs to be subjected to water lowering simultaneously, the water pumping task of the dewatering well of the first construction section cannot be stopped firstly, and the water lowering termination time meeting the design requirements can be stopped until the whole raft foundation construction is finished, so that the water pumping of the dewatering well can be stopped. This not only directly has brought a great deal of inconvenience for the reinforcement of raft foundation and concrete pouring, also brings very big trouble for the independent shutoff of later stage to the well head to handle. Once the well mouth plugging is not good, great hidden danger can be brought to the overall stability of the completed raft plate and the waterproof performance of the bottom of the raft plate. For the drainage well with large water inflow, or when the pumping depth is large and the pumping distance is long, the hidden danger is larger.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a when raft foundation construction dredge well and keep away immersible pump precipitation device, it can guarantee to dredge the interior immersible pump of well and normally draw water the use, does not hinder waterproof roll under the raft and lay subsides, raft reinforcement and concrete placement construction simultaneously to can lead the well shut in raft construction stage promptly, need not wait to dredge the well shut when precipitation task finishes.

The utility model discloses a realize above-mentioned purpose, realize through following technical scheme:

dredge well during raft foundation construction and keep somewhere immersible pump precipitation device, including dredging the well, it sets up the immersible pump to dredge the well below, the immersible pump delivery port is connected with the drain pipe, still be equipped with in the dredging well and reserve the water pipe, dredge the well head and settle well shut steel pipe, drain pipe, reserve the water pipe and draw forth the dredging well from dredging the well upper portion. The water discharge pipe is parallel with a submersible pump cable.

The hole is left to dredging well top one side, the hole is located the lower side of well-plugging steel pipe bottom, drain pipe (parallel immersible pump cable), reserve water pipe draw forth the dredging well from the hole, and arrange under the basement bed course of ground foundation soil surface, extend to raft board bottom outside the scope.

And the drain pipe (a parallel submersible pump cable) and the reserved water pipe are led out of the drainage well from the upper pipe orifice of the well sealing steel pipe.

The section of the reserved water pipe, which is 0.5-1.5 m from the bottom of the pipe to the top, is a perforated pipe with perforations on the side, and the diameter of each perforation is 2-3 mm.

At least two reserved water pipes are arranged in the drainage well.

The drain pipe and the reserved water pipe are PVC water pipes.

The diameter of the PVC water pipe is 40-50 mm.

The submersible pumps are arranged at the bottom of the drainage well and are respectively connected with a drain pipe (a parallel submersible pump cable).

The outer end of the reserved water pipe can be connected with a self-sucking pump for self-sucking and dewatering in the dredging well.

Contrast prior art, the beneficial effects of the utility model reside in that:

the device solves the contradiction conflict between the water pumping of the foundation pit dredging well and the raft construction, keeps the submersible pump in advance in the raft foundation construction stage, can ensure that the water pumping of the dredging well is kept normal, does not influence the operation surface of the raft foundation steel bar and the concrete construction, and further avoids the influence of the dredging well on the construction quality of the raft waterproof layer and the raft foundation concrete. When facing the big unwatering well of the volume of gushing water, or when the depth of drawing water is big, the distance of drawing water is far away, for guaranteeing precipitation unwatering effect, the self priming pump can't satisfy the requirement, and when must rely on the immersible pump to draw water, the advantage of this patent technique is very obvious.

Drawings

Fig. 1 is a schematic view of the structure of the submersible pump and the reserved spare water pipe before raft construction in embodiment 1 of the utility model.

Fig. 2 is the utility model discloses keep somewhere the immersible pump before raft construction and reserve the reserve water pipe in embodiment 1 to backfill the particle filter material structure sketch.

Fig. 3 is the structure schematic diagram of the raft plate construction closed draining well head in advance in the embodiment 1 of the utility model.

Fig. 4 is the utility model discloses precipitation drainage task finishes slip casting and consolidates drainage well structure sketch map among the embodiment 1.

Fig. 5 is the structural schematic diagram of the submersible pump and the reserved spare water pipe left before raft construction in embodiment 2 of the utility model.

Fig. 6 is the utility model discloses in embodiment 2 keep somewhere the immersible pump before the raft construction and reserve the water pipe structure for spare use to backfill the particle filter material structure sketch map.

Fig. 7 is the structure schematic diagram of the raft plate construction closed draining well head in advance in the embodiment 2 of the utility model.

Figure 8 is the utility model discloses among the embodiment 2 precipitation drainage task finishes the slip casting and consolidates the drainage well and handles PVC water pipe structure sketch map.

Reference numerals shown in the drawings:

1. draining the well; 2. a submersible pump; 3. a drain pipe; 4. reserving a water pipe; 5. sealing the well steel pipe; 6. a hole; 7. a floral tube.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.

The existing method is that the self-priming pump is used for dewatering the well and lowering water after advanced construction of the raft, the submersible pump 2 is not reserved, the effective suction distance of the self-priming pump is limited, the dewatering well 1 is generally arranged in the range region in the middle of the foundation pit, and when the depth of the foundation pit is greater than 10m and the area is large, the self-priming pump cannot pump water in a long distance and a large depth. Self priming pump power is limited, and to the great hydrophobic well 1 of gushing water volume, often need a plurality of self priming pumps to draw water, it is comparatively troublesome to reach the design requirement of drawing water. Therefore, for the dredging well 1 with large water inflow, or when the water pumping depth is large and the water pumping distance is long, in order to ensure the dewatering effect, the submersible pump 2 is required to pump water, and the waterproof layer and the raft foundation construction are not influenced at the same time, so the invention of the method for retaining the dredging well 1 with large water inflow and the submersible pump 2 thereof is very important in the raft foundation construction stage, and has very important application value in foundation pit dewatering and raft foundation construction. The perfect solution of technique the above-mentioned technical problem. The technology of the utility model comprises the following two embodiments:

example 1:

keep somewhere 1 precipitation plant of dribbling well during raft foundation construction, the major structure includes dribbling well 1, 1 below of dribbling well sets up

immersible pump

2, 2 delivery ports of immersible pump are connected with drain pipe 3, and immersible pump 2 is used for passing through drain pipe 3 with the groundwater and discharges to accomplish 1 precipitation of dribbling well. Still be equipped with in the dribbling well 1 and reserve water pipe 4, the well head of 1 wellheads of dribbling well is settled and is sealed well steel pipe 5, hole 6 is left to 1 top one side of dribbling well, hole 6 is located 5 tube bottom undersides of sealed well steel pipe, drain pipe 3 (parallel immersible pump cable), reserve water pipe 4 draw forth the dribbling well 1 from hole 6, and paste the ground soil table, arrange below the basement bed course, extend to raft board bottom outside the scope. The section of the reserved water pipe 4 which is 0.5-1.5 m from the bottom of the pipe upwards is a perforated pipe 7 with perforations on the side part, and the diameter of each perforation is 2-3 mm. At least two reserved water pipes 4 are arranged in the drainage well. The drain pipe 3 (parallel submersible pump cable) and the reserved water pipe 4 are PVC water pipes. The diameter of the PVC water pipe is 40-50 mm. The number of the submersible pumps 2 is 1 or more at the bottom of the drainage well, and the plurality of submersible pumps 2 are respectively connected with a drain pipe 3 (parallel submersible pump cables). The outer end of the reserved water pipe 4 can be connected with a self-priming pump for self-priming precipitation in the dredging well 1.

Example 1 construction method:

(1) before the raft cushion layer is poured, 1 submersible pump 2 which is overhauled and meets the design water pumping quantity of the dredging well 1 is left at the bottom in the dredging well 1. When the water quantity is large, 1 or more submersible pumps 2 can be left according to the requirement of the designed water pumping quantity.

(2) The drainage pipe 3(PVC water pipe) is properly connected with the retained submersible pump 2, a hole 6 is drilled on a gravel well pipe on the upper part of the drainage well 1, the PVC water pipe (parallel submersible pump cable) is led out of the drainage well 1 from the hole 6, is attached to the soil surface of the foundation, is arranged below a base cushion layer, extends out of the bottom range of the raft plate, and is connected to a water collection and drainage pipeline or led into a recharging well for recharging or pumped out of a pit. And after the well 1 is washed, the drainage is normal.

(3) And additionally reserving at least 2 reserved water pipes 4(PVC water pipes), wherein a pipe section of 1.5m upwards from the bottom of the pipe is a perforated pipe 7 with holes at the side part, the diameter of each hole is 2-3 mm, and the submersible pump 2 water pumping and draining pipe 3(PVC water pipe) in the previous step (2) is arranged and extended at the bottom of the cushion layer and is arranged under the cushion layer of the foundation soil surface base and extended out of the range of the bottom of the raft plate. At least 2 reserved water pipes 4(PVC water pipes) of this reservation are reserve, can regard as later stage in case 2 immersible pumps damage unable maintenance and have to start the use of self-priming pump, can regard as the use of later stage precipitation task back to 1 inside slip casting reinforcing shutoff of unwatering well to handle.

(4) Well shut-in steel pipe 5 is settled to the well head, and makes above-mentioned drain pipe 3(PVC water pipe), reserve water pipe 4(PVC water pipe) equipartition put in the outside of well shut-in steel pipe 5. The submersible pump 2 pumps water normally.

(5) And backfilling the gravel filter material to the elevation position of the bottom of the base cushion layer, wherein the gravel filter material is distributed around the submersible pump 2 and all PVC pipes, and the particle size of the filter material is 5-30 mm, which is proved by actual operation that the filter material with the particle size can not block the submersible pump 2, and the working state of the submersible pump 2 is not influenced by the surrounding gravel filter material.

(6) The submersible pump 2 maintains uninterrupted pumping. And (3) carrying out well sealing treatment on the well sealing steel pipe 5 according to design requirements, setting a waterproof layer according to the design requirements, filling and pouring concrete to normally seal the well, and normally constructing raft steel bars and concrete.

Note that: the process of keeping somewhere immersible pump 2 and drawing water to dredging well 1 may reach 2-5 months, also may be longer, and the immersible pump 2 that keeps somewhere uses also probably to break down or damage for a long time, in case this kind of condition appears, we will in time draw water to the installation self priming pump of reservation water pipe 4(PVC water pipe) of reserving.

(7) When the dewatering well 1 reaches the precipitation stopping time node meeting the design requirement, grouting plugging is carried out on each dewatering well 1 through at least 2 reserved water pipes 4(PVC water pipes) reserved in the early stage, secondary grouting is carried out on each reserved water pipe 4(PVC water pipe), and the submersible pump 2 completing the water pumping task is abandoned along with the grouting plugging of the dewatering well 1.

The method properly keeps the submersible pump 2 out of the dredging well 1, can ensure the submersible pump 2 in the dredging well 1 to pump water normally, and ensures the pumping task of the dredging well 1 with large water inrush quantity; meanwhile, the construction of the waterproof layer and the raft foundation is not influenced, namely the paving, the reinforcement and the concrete pouring of waterproof coiled materials under the raft are not influenced; the well is sealed in advance in the raft construction stage, and the well does not need to be sealed when the dewatering and dewatering tasks are finished.

Example 2:

different from the embodiment 1, in the embodiment 2, the drain pipe 3 (parallel submersible pump cable) and the reserved water pipe 4 lead out of the dewatering well 1 from the upper pipe orifice of the well-sealing steel pipe 5.

Example 2 construction method:

unlike the construction method of example 1, the construction method of example 2 includes:

the drain pipe 3 (parallel submersible pump cable) of connecting immersible pump 2, the reservation water pipe 4(PVC water pipe) more than 2 of reservation all can't be drawn forth and arrange from the basement bed course bottom again, and upwards draw forth in the well-plugging steel pipe 5, extend to beyond the raft board top scope.

Each reserved water pipe 4(PVC water pipe) is subjected to secondary grouting, after the submersible pump 2 which completes the pumping task is abandoned along with the grouting plugging of the dredging well 1, the drain pipe 3 (parallel submersible pump cable) on the upper part of the raft needs to be cut to be flush with the top surface of the raft, and all the PVC water pipes are filled with cement paste to be filled and fill and float the pipe orifice without leaving a gap.

In summary, the following steps:

this patent technique has solved the contradiction conflict of foundation ditch sparse dry well 1 pumping and raft construction, keeps somewhere immersible pump 2 in advance at raft foundation construction stage, not only can guarantee that sparse dry well 1 pumps water and keep normal, does not influence the operation face of raft foundation reinforcing bar and concrete construction moreover, has more avoided the influence of sparse dry well 1 to raft waterproof layer and raft foundation concrete construction quality.

When facing the big unwatering well 1 of the volume of gushing water, or when the depth of drawing water is big, the distance of drawing water is far away, for guaranteeing precipitation unwatering effect, the self priming pump can't satisfy the requirement, and when must rely on immersible pump 2 to draw water, the advantage of this patent technique is very obvious.

This patent technique has considered two kinds of situation construction situations in the actual engineering, keeps somewhere 2 schemes strong points of immersible pump, simple structure, and convenient operation is swift, and seals well effectual, and the feasibility of execution is better.

4 this patent technique is applied to the construction project, and the engineering is respond well, and beneficial effect is showing.

Claims

1. Immersible pump precipitation device is kept somewhere to dredge well during raft foundation construction, including dredge well (1), its characterized in that: the improved dredging well is characterized in that a submersible pump (2) is arranged below the dredging well (1), a water outlet of the submersible pump (2) is connected with a drain pipe (3), a reserved water pipe (4) is further arranged in the dredging well (1), a well sealing steel pipe (5) is arranged at a well mouth of the dredging well (1), and the drain pipe (3) and the reserved water pipe (4) are led out of the dredging well (1) from the upper part of the dredging well (1).

2. The submersible pump precipitation device is left in dredge well during raft foundation construction of claim 1, characterized in that: hole (6) are left to sparse dry well (1) top one side, hole (6) are located well-sealing steel pipe (5) tube bottom downside, drain pipe (3), reserve water pipe (4) draw forth sparse dry well (1) from hole (6), and arrange under the foundation soil surface basement bed course of pasting, extend to raft board bottom outside the scope.

3. The submersible pump precipitation device is left in dredge well during raft foundation construction of claim 1, characterized in that: the drain pipe (3) and the reserved water pipe (4) are led out of the dewatering well (1) from the upper pipe orifice of the well sealing steel pipe (5).

4. The device for retaining the submersible pump for the dewatering well during raft foundation construction according to claim 2 or 3, characterized in that: the section of the reserved water pipe (4) which is 0.5-1.5 m from the bottom of the pipe upwards is a perforated pipe (7) with holes at the side part, and the diameter of each hole is 2-3 mm.

5. The submersible pump precipitation device is left in dredge well during raft foundation construction of claim 4, characterized in that: at least two reserved water pipes (4) are arranged in the drainage well (1).

6. The submersible pump precipitation device is left in the dredge well during raft foundation construction according to claim 5, characterized in that: the drain pipe (3) and the reserved water pipe (4) are PVC water pipes.

7. The submersible pump precipitation device is left in dredge well during raft foundation construction of claim 6, characterized in that: the diameter of the PVC water pipe is 40-50 mm.

8. The submersible pump precipitation device is left in dredge well during raft foundation construction of claim 1, characterized in that: the submersible pumps (2) are arranged at the bottom of the drainage well (1) in a plurality, and the submersible pumps (2) are respectively connected with a drainage pipe (3).

9. The submersible pump precipitation device is left in dredge well during raft foundation construction of claim 1, characterized in that: the outer end of the reserved water pipe (4) can be connected with a self-priming pump to be used for self-priming precipitation in the dewatering well (1).