CN110629776A - Foundation pit dewatering well with backwashing function and backwashing method thereof - Google Patents
Foundation pit dewatering well with backwashing function and backwashing method thereof Download PDFInfo
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- CN110629776A CN110629776A CN201910898722.6A CN201910898722A CN110629776A CN 110629776 A CN110629776 A CN 110629776A CN 201910898722 A CN201910898722 A CN 201910898722A CN 110629776 A CN110629776 A CN 110629776A
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- pipe
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- foundation pit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/02—Combinations of filters of different kinds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a foundation pit dewatering well with a backwashing function and a backwashing method thereof. By adopting the foundation pit dewatering well with the backwashing function and the backwashing method thereof, the dewatering well can be periodically backwashed, so that the filter materials and the filter pipes of the dewatering well are prevented from being blocked, and the dewatering effect is ensured.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a foundation pit dewatering well with a backwashing function and a backwashing method thereof.
Background
In the process of excavation construction of the foundation pit, a dewatering well needs to be arranged in the foundation pit and/or around the foundation pit so as to reduce the underground water level of the foundation pit and ensure the construction safety. The existing precipitation well generally comprises a well pipe, wherein the well pipe sequentially comprises a lower solid pipe section, a filter pipe section and an upper solid pipe section from bottom to top, a layer of nylon net is wrapped outside the filter pipe section, a filter material is filled around the well pipe, during precipitation, underground water around the precipitation well enters the well pipe through the filter material and from the filter pipe section, the filter material and the filter pipe have the function of filtering silt, the filter material and the filter pipe are blocked by the silt easily and even are blocked, and precipitation of the precipitation well is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a foundation pit dewatering well with a backwashing function and a backwashing method thereof, which are used for periodically backwashing the dewatering well, preventing the filter material and the filter pipe of the dewatering well from being blocked and ensuring the dewatering effect.
On one hand, the invention provides a foundation pit dewatering well with a backwashing function, which comprises a basic well, a well pipe arranged in the basic well, a filter material filled between the basic well and the lower part of the well pipe, and a first water pipe and a second water pipe which respectively extend into the well pipe, the well pipe comprises a first solid pipe, a first filtering pipe, a second solid pipe, a second filtering pipe and a third solid pipe which are connected in sequence from bottom to top, the inner periphery of the second solid pipe is provided with a plugging plate, the middle part of the plugging plate is provided with a conical hole with a small upper part diameter and a large lower part diameter, the first water pipe passes the bell mouth, the shutoff head is connected to the lower extreme of first water pipe, the shutoff head is that the upper portion diameter is little, the big toper of lower part diameter is stopped, shutoff head and bell mouth adaptation, the center of shutoff head be equipped with the water hole of crossing of first water pipe intercommunication, the lower extreme of second water pipe extends the upside of shutoff board.
Furthermore, a rubber water stop pad is fixedly wrapped outside the conical surface of the plugging head.
Further, the filtering aperture of the second filtering pipe is larger than that of the first filtering pipe.
Furthermore, a plugging ring matched with the second filtering pipe is arranged in the well pipe, the plugging ring is arranged on the plugging plate, the middle part of the plugging ring is fixed on the first water pipe, the second water pipe penetrates through the plugging ring, and the first water pipe can drive the plugging ring to move up and down to open or plug the filtering holes of the second filtering pipe.
Furthermore, the plugging ring comprises an inner ring body, an outer ring body and a plurality of connecting plates connected between the inner ring body and the outer ring body, the outer ring body is used for plugging the filtration pores of the second filtration pipe, the inner ring body is sleeved outside the first water pipe and fixedly connected with the first water pipe, and the second water pipe penetrates through the space between the two adjacent connecting plates.
Furthermore, the outer ring body comprises a support ring fixedly connected with the connecting plate and a rubber water stop ring sleeved outside the support ring.
Further, the inner diameter of the third solid pipe is larger than that of the second filtering pipe, and a chamfer is arranged on the outer periphery of the lower end of the plugging ring.
Further, the foundation well and the upper part of the well pipe are filled with clay.
On the other hand, the invention provides a backwashing method of the foundation pit dewatering well with the backwashing function, which comprises the following steps:
step S1, the dewatering well stops dewatering, the first water pipe is lifted, and the first water pipe pulls the plugging head into and plugs the plugging head in the conical hole of the plugging plate;
step S2, replacing a water suction pump connected to the outer end of the first water pipe with a high-pressure water pump, and injecting clean water into the well pipe below the plugging head through the high-pressure water pump;
step S3, the clean water injected into the well pipe below the plugging head is pressed out from the filter holes of the first filter pipe, goes through the filter material to flow upwards in the counter current, and then flows into the well pipe above the plugging head from the filter holes of the second filter pipe;
and step S4, connecting the outer end of the second water pipe with a water suction pump, and pumping water in the well pipe above the plugging head out of the well through the water suction pump.
The invention has the beneficial effects that: when the foundation pit is lowered, underground water continuously enters the well pipe from the filter holes of the first filter pipe, the lower end of the first water pipe extends into the first filter pipe, the upper end of the first water pipe is connected with a water suction pump to pump and discharge water in the well pipe, so that the foundation pit is lowered, when the underground water level rises and the water amount in the well pipe obviously decreases, the filter holes of the first filter pipe are blocked, the filter holes need to be cleaned, when the water is cleaned, the water lowering well stops lowering, the first water pipe is lifted to pull the plugging heads into and plug the conical holes of the plugging plates, then clean water is injected into the well pipe below the plugging heads through a high-pressure water pump, the clean water is pressed out from the filter holes of the first filter pipe and flows to the top through the filter material in a counter-flow mode, then flows into the well pipe above the plugging heads from the filter holes of the second filter pipe, and finally the water in the well pipe above the plugging heads is pumped out. This application adopts the mode of back flush to wash the filtration pore, and outside the sewage discharge well after the washing, not only rinse thoroughly, the operation of being convenient for, but also can prevent that abluent filth from causing secondary pollution in the backward flow well. Therefore, by adopting the foundation pit dewatering well with the backwashing function and the backwashing method thereof, the dewatering well can be periodically backwashed, the filter materials and the filter pipes of the dewatering well are prevented from being blocked, and the dewatering effect is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Throughout the drawings, similar devices or portions are generally identified by similar reference numerals. In the drawings, the various devices or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of a precipitation structure according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of backwashing according to an embodiment of the present invention.
In the drawings, 10 denotes a foundation well; 20 a well pipe; 21 denotes a first solid tube; 22 denotes a first filtering pipe; 23 denotes a second solid tube; 24 denotes a second filtering pipe; 25 denotes a third solid tube; 30 denotes a filter material; 31 denotes a clay soil; 40 denotes a first water pipe; 50 denotes a second water pipe; 60 denotes a plugging plate; 61 denotes a tapered hole; 70 denotes a stopper head; 71 denotes water passing holes; 72 denotes a rubber water stop pad; 80 represents an occlusion ring; 81 represents an internal ring body; 82 denotes an outer ring body; 821 denotes a support ring; 822 denotes a rubber water stop ring; 83 denotes a connecting plate; and 84 denotes a chamfer.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the patent is not limited thereby.
As shown in fig. 1 to 3, the embodiment of the invention provides a foundation pit dewatering well with a backwashing function, which comprises a foundation well 10, a well pipe 20 arranged in the foundation well 10, a filter material 30 filled between the foundation well 10 and the lower part of the well pipe 20, and a first water pipe 40 and a second water pipe 50 respectively extending into the well pipe 20.
The well casing 20 comprises a first solid pipe 21, a first filtering pipe 22, a second solid pipe 23, a second filtering pipe 24 and a third solid pipe 25 which are sequentially connected from bottom to top, a plugging plate 60 is arranged on the inner periphery of the second solid pipe 23, a tapered hole 61 with a small upper diameter and a large lower diameter is formed in the middle of the plugging plate 60, the first water pipe 40 penetrates through the tapered hole 61, a plugging head 70 is connected to the lower end of the first water pipe 40, the plugging head 70 is a tapered head with a small upper diameter and a large lower diameter, the plugging head 70 is matched with the tapered hole 61, a water passing hole 71 communicated with the first water pipe 40 is formed in the center of the plugging head 70, and the lower end of the second water pipe 50 extends to the upper side of the plugging plate 60.
When the foundation pit descends, underground water continuously enters the well pipe 20 from the filtering holes of the first filtering pipe 22, the lower end of the first water pipe 40 extends into the first filtering pipe 22, the upper end of the first water pipe 40 is connected with a water suction pump to pump and discharge water in the well pipe 20, thereby realizing the precipitation of the foundation pit, when the groundwater level rises and the water amount in the well pipe 20 is obviously reduced, indicating that the filtration pores of the first filtration pipe 22 are blocked, the filtration pores need to be cleaned, when the filtration pores are cleaned, the precipitation well stops precipitation, the first water pipe 40 is lifted to pull the plugging head 70 into and plug the plugging head in the tapered hole 61 of the plugging plate 60, then clean water is injected into the well pipe 20 below the plugging head 70 through a high-pressure water pump, the clean water is pressed out from the filtering holes of the first filtering pipe 22, and then flows into the well pipe 20 above the plugging head 70 from the filter holes of the second filter pipe 24 through the filter material 30 in the upstream direction, and finally the water in the well pipe 20 above the plugging head 70 is pumped out by a water pump.
The filter material 30 of this embodiment is the gravel and sand material of diameter between 3 ~ 7 millimeters, and it has cohesive soil 31 to fill between the upper portion of basic well 10 and well casing 20 to it is sealed between the upper portion of basic well 10 and well casing 20 through clay, prevents that the rainwater on ground from permeating filter material 30.
In order to improve the water stopping effect between the plugging head 70 and the plugging plate 60, a rubber water stopping pad 72 is wrapped and fixed outside the conical surface of the plugging head 70 in this embodiment.
Because the foundation ditch precipitation well of this embodiment has the function of back flush, can reduce the filtration aperture of first filter tube 22, improve filter effect, even the filtration pore of first filter tube 22 is stifled, also can wash, dredge, for when wasing the filtration pore of first filter tube 22, the filth of washing can be followed second filter tube 24 and discharged, the filtration aperture of second filter tube 24 needs to be designed a little more, as long as can satisfy to filter material 30, consequently the filtration aperture of second filter tube 24 will be greater than the filtration aperture of first filter tube 22.
In this embodiment, a plugging ring 80 adapted to the second filtering pipe 24 is disposed in the well pipe 20, the plugging ring 80 is disposed on the plugging plate 60, the middle portion of the plugging ring 80 is fixed to the first water pipe 40, the second water pipe 50 passes through the plugging ring 80, and the first water pipe 40 can drive the plugging ring 80 to move up and down to open or plug the filtering holes of the second filtering pipe 24. Because the filtering aperture of the first filtering pipe 22 is larger than that of the second filtering pipe 24, the first filtering pipe 22 is better, the filtering effect of the second filtering pipe 24 is relatively poorer, when the first water pipe 40 is put down for precipitation, the first water pipe 40 drives the plugging ring 80 to descend into the second filtering pipe 24, the filtering aperture of the second filtering pipe 24 is plugged by the plugging ring 80, only the first filtering pipe 22 is reserved for filtering, the integral filtering effect of the precipitation well is improved, when the first water pipe 40 is promoted for backwashing, the first water pipe 40 drives the plugging ring 80 to ascend, the ring plugging is separated from the second filtering pipe 24, and the plugging of the second filtering pipe 24 is opened for backwashing water outlet.
Specifically, the plugging ring 80 comprises an inner ring 81, an outer ring 82 and a plurality of connecting plates 83 connected between the inner ring 81 and the outer ring 82, the outer ring 82 is used for plugging the filtration pores of the second filtration tube 24, the inner ring 81 is sleeved outside the first water tube 40 and fixedly connected with the first water tube, and the second water tube 50 passes through between two adjacent connecting plates 83. Through the design, the inner ring body 81 is fixed with the first water pipe 40, the outer ring body 82 is used for plugging the filtration pores of the second filtration pipe 24, a channel is formed between the inner ring body 81 and the outer ring body 82, so that the upper well pipe 20 and the lower well pipe 20 of the plugging ring 80 are kept communicated, the plugging ring 80 can move up and down without being influenced by air pressure, meanwhile, the second water pipe 50 can also pass through the inner ring body 81 and the outer ring body 82, and the structural design is reasonable. In this embodiment, the outer ring 82 includes a support ring 821 fixedly connected to the connection plate 83 and a rubber water stop ring 822 fitted around the support ring 821, and the outer ring 82 is in contact with the inner circumferential surface of the second filter pipe 24 through the rubber water stop ring 822, thereby improving the water stop effect.
In order to reduce the friction between the plugging ring 80 and the third solid pipe 25 in the process of lifting or lowering the plugging ring 80, the inner diameter of the third solid pipe 25 is larger than the inner diameter of the second filtering pipe 24, that is, the outer diameter of the plugging ring 80 is equivalent to the inner diameter of the second filtering pipe 24, the outer diameter of the plugging ring 80 is slightly smaller than the inner diameter of the third solid pipe 25, and in order to ensure that the plugging ring 80 can be smoothly embedded into the second filtering pipe 24 when the plugging ring 80 is lowered, a chamfer 84 is arranged on the outer periphery of the lower end of the plugging ring 80.
As shown in fig. 1 to 3, an embodiment of the present invention provides a back washing method for a foundation pit dewatering well with a back washing function, including the following steps:
step S1, the precipitation well stops precipitation, the first water pipe 40 is lifted, and the first water pipe 40 pulls the plugging head 70 into and plugs the conical hole 61 of the plugging plate 60;
step S2, replacing a water pump connected to the outer end of the first water pipe 40 with a high-pressure water pump, and injecting clean water into the well pipe 20 below the plugging head 70 through the high-pressure water pump;
step S3, the clean water injected into the well pipe 20 below the plugging head 70 is pressed out from the filter holes of the first filter pipe 22, flows upwards in the reverse direction through the filter material 30, and then flows into the well pipe 20 above the plugging head 70 from the filter holes of the second filter pipe 24;
and step S4, connecting the outer end of the second water pipe 50 with a water pump, and pumping water in the well pipe 20 above the plugging head 70 out of the well through the water pump.
This application adopts the mode of back flush to wash the filtration pore, and outside the sewage discharge well after the washing, not only rinse thoroughly, the operation of being convenient for, but also can prevent that abluent filth from causing secondary pollution in the backward flow well.
In conclusion, by adopting the foundation pit dewatering well with the backwashing function and the backwashing method thereof, the backwashing can be regularly performed on the dewatering well, the filter material 30 and the filter pipe of the dewatering well are prevented from being blocked, and the dewatering effect is ensured.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. A foundation pit dewatering well with a backwashing function is characterized by comprising a foundation well, a well pipe arranged in the foundation well, a filter material filled between the foundation well and the lower part of the well pipe, a first water pipe and a second water pipe which respectively extend into the well pipe, the well pipe comprises a first solid pipe, a first filtering pipe, a second solid pipe, a second filtering pipe and a third solid pipe which are connected in sequence from bottom to top, the inner periphery of the second solid pipe is provided with a plugging plate, the middle part of the plugging plate is provided with a conical hole with a small upper part diameter and a large lower part diameter, the first water pipe passes the bell mouth, the shutoff head is connected to the lower extreme of first water pipe, the shutoff head is that the upper portion diameter is little, the big toper of lower part diameter is stopped, shutoff head and bell mouth adaptation, the center of shutoff head be equipped with the water hole of crossing of first water pipe intercommunication, the lower extreme of second water pipe extends the upside of shutoff board.
2. The foundation pit dewatering well with the back washing function as claimed in claim 1, wherein a rubber water stop pad is fixedly wrapped outside the conical surface of the plugging head.
3. The foundation pit dewatering well with backwashing function according to claim 1, wherein the filtration pore size of the second filter pipe is larger than that of the first filter pipe.
4. The foundation pit dewatering well with the back washing function as claimed in claim 3, wherein a plugging ring adapted to the second filtering pipe is arranged in the well pipe, the plugging ring is arranged on the plugging plate, the middle part of the plugging ring is fixed to the first water pipe, the second water pipe penetrates through the plugging ring, and the first water pipe can drive the plugging ring to move up and down to open or plug the filtering holes of the second filtering pipe.
5. The foundation pit dewatering well with backwashing function according to claim 4, wherein the plugging ring comprises an inner ring body, an outer ring body and a plurality of connecting plates connected between the inner ring body and the outer ring body, the outer ring body is used for plugging the filtration pores of the second filtration pipe, the inner ring body is sleeved outside the first water pipe and is fixedly connected with the first water pipe, and the second water pipe penetrates through the space between two adjacent connecting plates.
6. The foundation pit dewatering well with backwashing function according to claim 5, wherein the outer ring body comprises a support ring fixedly connected with the connecting plate and a rubber water stop ring sleeved outside the support ring.
7. The foundation pit dewatering well with the back washing function as claimed in claim 4, wherein the inner diameter of the third solid pipe is larger than that of the second filtering pipe, and the outer periphery of the lower end of the plugging ring is provided with a chamfer.
8. The foundation pit dewatering well with backwashing function according to claim 1, wherein cohesive soil is filled between the foundation well and the upper part of the well pipe.
9. The backwashing method of the foundation pit dewatering well with the backwashing function as claimed in any one of claims 1 to 8, comprising the steps of:
step S1, the dewatering well stops dewatering, the first water pipe is lifted, and the first water pipe pulls the plugging head into and plugs the plugging head in the conical hole of the plugging plate;
step S2, replacing a water suction pump connected to the outer end of the first water pipe with a high-pressure water pump, and injecting clean water into the well pipe below the plugging head through the high-pressure water pump;
step S3, the clean water injected into the well pipe below the plugging head is pressed out from the filter holes of the first filter pipe, goes through the filter material to flow upwards in the counter current, and then flows into the well pipe above the plugging head from the filter holes of the second filter pipe;
and step S4, connecting the outer end of the second water pipe with a water suction pump, and pumping water in the well pipe above the plugging head out of the well through the water suction pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898722.6A CN110629776B (en) | 2019-09-23 | 2019-09-23 | Foundation pit dewatering well with backwashing function and backwashing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898722.6A CN110629776B (en) | 2019-09-23 | 2019-09-23 | Foundation pit dewatering well with backwashing function and backwashing method thereof |
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| Publication Number | Publication Date |
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| CN110629776A true CN110629776A (en) | 2019-12-31 |
| CN110629776B CN110629776B (en) | 2021-04-20 |
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| CN107448198A (en) * | 2017-09-26 | 2017-12-08 | 中国科学院武汉岩土力学研究所 | A kind of double-deck water plug and double-deck pumping system |
| CN108049847A (en) * | 2017-12-14 | 2018-05-18 | 中国地质调查局水文地质环境地质调查中心 | A kind of twin packer layering water plug and method |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202809698U (en) * | 2012-01-19 | 2013-03-20 | 罗菁 | Pipe well gravel-filling bed with flushing function |
| CN103031850A (en) * | 2013-01-08 | 2013-04-10 | 中铁上海工程局有限公司 | Low-permeability sludge claypan ultra-vacuum dual-pipe unwatering well and construction technology |
| CN104018511A (en) * | 2014-03-26 | 2014-09-03 | 福州市规划设计研究院 | Construction process of underground construction drainage anti-floating device |
| CN105401587A (en) * | 2015-12-29 | 2016-03-16 | 上海广联环境岩土工程股份有限公司 | Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system |
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| CN110629776B (en) | 2021-04-20 |
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