CN218911482U - Foundation pit dewatering well - Google Patents
Foundation pit dewatering well Download PDFInfo
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- CN218911482U CN218911482U CN202223094248.8U CN202223094248U CN218911482U CN 218911482 U CN218911482 U CN 218911482U CN 202223094248 U CN202223094248 U CN 202223094248U CN 218911482 U CN218911482 U CN 218911482U
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- pit dewatering
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Abstract
The utility model discloses a foundation pit dewatering well, and relates to the technical field of constructional engineering. The foundation pit dewatering well comprises a well hole arranged on a foundation, a well pipe, a filter pipe and a sand setting pipe which are arranged in the well hole, wherein the well pipe, the filter pipe and the sand setting pipe are sequentially communicated from top to bottom, a first filter layer is arranged between the bottom of the well hole and the sand setting pipe, and a second filter layer is arranged outside the well pipe, the filter pipe and the sand setting pipe along the radial direction of the well hole. The technical scheme of the utility model can solve the problem of excessive sediment in the well when the existing foundation pit dewatering well pumps water.
Description
Technical Field
The utility model relates to the technical field of constructional engineering, in particular to a foundation pit dewatering well.
Background
Well-point precipitation is a method for artificially lowering the groundwater level. Therefore, the method is also called as a well point dewatering method, a certain number of foundation pit dewatering wells are arranged around the foundation pit before the foundation pit is excavated, and water is pumped by using water pumping equipment to ensure that the excavated soil always keeps a dry state.
In the existing foundation pit dewatering well, a filter material is filled between the outer side of the well pipe and the inner wall of the well, and when the water pump is used for pumping underground water in the dewatering well, the filter material plays a role in filtering, so that sediment on the outer side of the well pipe is prevented from entering the well pipe, and the normal operation of the water pump is influenced. However, when the water pump pumps water, groundwater at the bottom of the well pipe also flows towards the inside of the well pipe to drive sediment below the well pipe to enter the well pipe, so that the normal use of the water pump is affected.
Disclosure of Invention
The utility model mainly aims to provide a foundation pit dewatering well, and aims to solve the problem of excessive sediment in a well when the existing foundation pit dewatering well pumps water.
In order to achieve the above object, the foundation pit dewatering well provided by the present utility model includes:
a well hole arranged on the foundation;
the well pipe, the filter pipe and the sand setting pipe are sequentially communicated from top to bottom;
the well pipe, the filter pipe and the sand setting pipe are arranged on the periphery of the well pipe, the filter pipe and the sand setting pipe in the radial direction of the well hole.
In an embodiment, the wellbore inner diameter is larger than the outer diameters of the well tubular, filter tube and sand setting tube, which are coaxially arranged.
In an embodiment, the height of the first filter layer along the axial direction of the borehole is 50cm, and the first filter layer comprises filled sand cobbles, and the particle size of the sand cobbles is 5-15mm.
In an embodiment, a steel plate is further laid between the well bottom and the first filter layer.
In one embodiment, the second filter layer comprises pebbles uniformly filled outside the well pipe, the filter pipe and the sand setting pipe, and the pebbles have the particle size of 5-15mm.
In one embodiment, the well is provided with a wellhead communicating with the earth surface, the well pipe extends out of the wellhead, a clay layer is arranged between the outer side of the well pipe, which is close to one end of the wellhead, and the inner wall of the well, and a sealing layer is arranged on the outer side of the well pipe, which extends out of the wellhead.
In an embodiment, the foundation pit dewatering well further comprises a sealing cover, and the sealing cover seals a port of the well pipe extending out of one end of the wellhead.
In an embodiment, the length of the well pipe extending out of the wellhead portion is 0.2-0.5m.
In an embodiment, the filter tube is made of a steel tube, a plurality of filter holes are formed in the steel tube, the inner diameter of each filter hole is 5-10mm, and the ratio of the total area of the plurality of filter holes to the side area of the steel tube is not less than 0.15.
In an embodiment, a filter screen is sleeved outside the filter tube, and the filter screen is made of a 40-mesh steel wire mesh or a 40-mesh nylon mesh.
According to the technical scheme, the first filter layer and the second filter layer are arranged to filter the underground water entering the filter tube from the outer side and the bottom of the filter tube, so that the quantity of sediment particles entering the filter tube is reduced; meanwhile, a small amount of sediment particles entering the filter tube are deposited through the sand setting tube, so that the quantity of sediment particles contained in the filter tube is further reduced, and the influence of the sediment particles on the stable operation of the water suction pump when the foundation pit dewatering well pumps water is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an embodiment of a dewatering well for foundation pit of the present utility model.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the |
| 100 | Foundation pit dewatering well | 10 | Well |
| 20 | |
30 | |
| 40 | |
50 | |
| 60 | |
70 | |
| 80 | |
90 | Filter screen |
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
In the existing foundation pit dewatering well, a filter material is filled between the outer side of the well pipe and the inner wall of the well, and when the water pump is used for pumping underground water in the dewatering well, the filter material plays a role in filtering, so that sediment on the outer side of the well pipe is prevented from entering the well pipe, and the normal operation of the water pump is influenced. However, when the water pump pumps water, groundwater at the bottom of the well pipe also flows towards the inside of the well pipe to drive sediment below the well pipe to enter the well pipe, so that the normal use of the water pump is affected.
In order to solve the problems, the utility model provides a foundation pit dewatering well.
Referring to fig. 1, in the present embodiment, the dewatering well 100 for foundation pit includes a well hole disposed on a foundation, and a well pipe 10, a filter pipe 20 and a sand setting pipe 30 disposed in the well hole, wherein the well pipe 10, the filter pipe 20 and the sand setting pipe 30 are sequentially communicated from top to bottom, a first filter layer 40 is disposed between the bottom of the well hole and the sand setting pipe 30, and a second filter layer 50 is disposed along the periphery of the well pipe 10, the filter pipe 20 and the sand setting pipe 30 in the radial direction of the well hole.
The well pipe 10, the filter pipe 20 and the sand setting pipe 30 are sequentially communicated from top to bottom, namely, the sand setting pipe 30 is positioned at the bottom of the well hole, the filter pipe 20 is positioned between the sand setting pipe 30 and the well pipe 10, when the foundation pit dewatering well 100 pumps water, a water pump connected with a water drain pipe is arranged in the filter pipe 20, and after the water pump is started, water is pumped out of the foundation pit dewatering well 100 through the water drain pipe. Groundwater outside the pit dewatering well 100 mainly enters the filter tube 20 through the second filter layer 50, and when the groundwater passes through the second filter layer 50, sediment driven by flow is blocked by the second filter layer 50, so that the quantity of sediment particles entering the filter tube 20 is reduced, and meanwhile, the filter tube 20 can also filter and block some sediment particles. When the groundwater enters the filter tube 20 from the sand setting tube 30, the silt driven by the flowing needs to pass through the first filtering layer 40, and is blocked by the first filtering layer 40, so as to reduce the amount of silt particles entering the filter tube 20. The sand setting pipe 30 is used for depositing sediment particles in the filter pipe 20 and the well pipe 10, a small amount of sediment particles can be deposited through the sand setting pipe 30 after entering the filter pipe 20, so that the sediment particles in the filter pipe 20 are further reduced, and the stable and normal operation of the suction pump during pumping in the pit drop pit is ensured.
The underground water entering the filter tube 20 from the outer side and the bottom of the filter tube 20 is filtered by the first filter layer 40 and the second filter layer 50 respectively, so that the quantity of sediment particles entering the filter tube 20 is reduced; meanwhile, a small amount of sediment particles entering the filter tube 20 are deposited through the sand setting tube 30, so that the quantity of the sediment particles contained in the filter tube 20 is further reduced, and the influence of the sediment particles on the stable operation of the water suction pump when the foundation pit dewatering well 100 pumps water is reduced.
Specifically, the well pipe 10, the filter pipe 20 and the sand setting pipe 30 may be connected by a clamping connection or a screw connection, so that the well pipe 10, the filter pipe 20 and the sand setting pipe 30 are connected when the foundation pit dewatering well 100 is constructed.
It will be appreciated that the well pipe 10, filter tube 20 and sand setting pipe 30 are provided in the borehole, and that the second filter layer 50 is also provided on the outer circumference of the well pipe 10, filter tube 20 and sand setting pipe 30, whereby the borehole inner diameter is larger than the outer diameters of the well pipe 10, filter tube 20 and sand setting pipe 30. In an embodiment, the well pipe 10, the filter pipe 20, the sand setting pipe 30 and the well bore are coaxially arranged, that is, there is no contact between the outer side walls of the well pipe 10, the filter pipe 20 and the sand setting pipe 30 and the inner wall of the well bore, the second filter layer 50 is annularly arranged outside the well pipe 10, the filter pipe 20 and the sand setting pipe 30, and the second filter layer 50 can filter groundwater entering the filter pipe 20 at various positions in the circumferential direction of the filter pipe 20.
Specifically, the second filter layer 50 includes pebbles uniformly filled in the outer circumferences of the well pipe 10, the filter tube 20 and the sand setting pipe 30, and the pebbles have a particle size of 5 to 15mm. The second filter layer 50 is disposed around the well pipe 10, the filter pipe 20 and the sand setting pipe 30, and the pebbles are uniformly filled, so that no accumulation bridge is formed between the pebbles, and a good filtering effect can be achieved. When the particle size of the cobble is too large, gaps among the cobble particles are too large, so that a good filtering effect cannot be achieved; when the particle size of the pebble is too small, the pebble is easy to flow under the drive of water flow, the meaning of filtration is lost, and the particle size of the pebble is controlled to be 5-15mm.
The height of the first filter layer 40 along the axial direction of the well is 50cm, and the first filter layer 40 comprises filled sand cobble with the particle size of 5-15mm. I.e. between the bottom of the well bore and the sand setting pipe 30, sand and pebbles are filled, the filling height being 50cm. When the filling height is too small, the filtering effect is insufficient; when the filling height is too large, the filtering function is excessive, the cost is increased due to the increase of the material consumption, meanwhile, the required well depth is increased, the construction difficulty and the cost are increased, and preferably, the filling height of the first filtering layer 40 is set to be 50cm. When the particle size of the sandy cobbles is too large, gaps among the sandy cobbles are too large, so that a good filtering effect cannot be achieved; when the particle size of the sandy pebbles is too small, the sandy pebbles are easy to flow under the drive of water flow, lose the meaning of filtration, and are better, and the particle size of the sandy pebbles is controlled to be 5-15mm.
Further, in an embodiment, a steel plate is further laid between the well bottom and the first filter layer 40. After the well construction is completed, a steel plate is paved at the bottom of the well, and then backfilled on the steel plate to form the first filter layer 40. The well hole is formed by digging, after construction, broken soil residues containing silt particles exist at the bottom of the well hole, and the steel plate is paved at the bottom of the well hole, so that the effect of isolating the broken soil residues from the first filter layer 40 can be achieved, the broken soil residues are prevented from being mixed into the first filter layer 40, and the filtering effect of the first filter layer 40 is reduced.
In one embodiment, the wellbore is provided with a wellhead communicating with the earth, the well pipe 10 extends out of the wellhead, a clay layer 60 is provided between the outside of the end of the well pipe 10 near the wellhead and the inner wall of the wellbore, and a sealing layer 70 is provided on the outside of the portion of the well pipe 10 extending out of the wellhead.
The clay layer 60 acts as a fixing, and by filling clay between the outside of the end of the well pipe 10 near the wellhead and the inner wall of the borehole, the fixation of the well pipe 10 in the borehole is achieved, reducing the amount of deflection of the well pipe 10 in its radial direction, and the amount of settlement in its axial direction. The outer side of the well pipe 10 extending out of the wellhead portion is provided with a sealing layer 70, the sealing layer 70 is typically a concrete layer, and the well pipe 10 is fixed to a foundation by pouring concrete on the outer side of the well pipe 10 extending out of the wellhead portion, and the well pipe 10 is further fixed.
Specifically, the length of the well pipe 10 extending out of the wellhead portion is 0.2-0.5m. The well pipe 10 is arranged to extend out of the wellhead to prevent surface sewage from flowing into the well pipe 10 and to prevent silt particles contained in the surface sewage from entering the filter tube 20. The length of the well pipe 10 extending beyond the wellhead is too short to effectively block surface sewage; when the length of the well pipe 10 extending out of the wellhead part is too long, the requirement on the whole length of the well pipe 10 is increased, the consumable cost is increased, and meanwhile, when groundwater is pumped out of the foundation pit dewatering well 100, the requirement on the lift of a water pump is also increased, and the construction cost is increased. Preferably, the length of the well pipe 10 extending out of the wellhead portion is set to 0.2-0.5m.
It will be appreciated that, because the water in the dewatering well 100 of the foundation pit needs to be pumped out, the end of the well pipe 10 extending out of the wellhead is provided with a port into which a water pump and a drain pipe extend, when the surrounding environment has large sand wind, sundries in the surrounding environment are easy to drive to the port of the well pipe 10, and the port enters the well pipe 10, thereby affecting the water quality in the filter pipe 20.
In view of this, in one embodiment, the pit dewatering well 100 further comprises a sealing cap 80, the sealing cap 80 sealing the port of the well pipe 10 extending out of the wellhead end. When the sealing cover 80 seals the port, sundries can be prevented from entering the well pipe 10, and when the foundation pit dewatering well 100 needs to be pumped or overhauled, the sealing cover 80 can be opened.
From the above, the filter tube 20 may perform a certain filtering function, and specifically, the filter tube 20 may be a bridge filter tube of a finished product or may be made of a steel tube by punching. When the filter tube 20 is made of a steel tube, a plurality of filter holes are formed in the steel tube, the inner diameter of each filter hole is 5-10mm, and the ratio of the total area of the plurality of filter holes to the side area of the steel tube is not less than 0.15. Preferably, the filtering holes are uniformly distributed on the side surface of the steel pipe, so that groundwater at various angles can flow into the filtering pipe 20.
Further, in order to enhance the filtering capability of the filter tube 20, a filter screen 90 is sleeved outside the filter tube 20, and the filter screen 90 is made of a 40 mesh steel wire mesh or a 40 mesh nylon mesh.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. The utility model provides a foundation ditch dewatering well which characterized in that includes:
a well hole arranged on the foundation;
the well pipe, the filter pipe and the sand setting pipe are sequentially communicated from top to bottom;
the well pipe, the filter pipe and the sand setting pipe are arranged on the periphery of the well pipe, the filter pipe and the sand setting pipe in the radial direction of the well hole.
2. Foundation pit dewatering well according to claim 1, wherein the borehole inner diameter is larger than the outer diameters of the well pipe, filter tube and sand settling tube, which are coaxially arranged.
3. Foundation pit dewatering well according to claim 2, wherein the height of the first filter layer in the direction of the borehole axis is 50cm, the first filter layer comprising filled sand pebbles with a particle size of 5-15mm.
4. A pit dewatering well as claimed in claim 3, wherein a steel plate is also laid between the borehole bottom and the first filter layer.
5. Foundation pit dewatering well according to claim 2, wherein the second filter layer comprises pebbles evenly filled outside the well pipe, filter pipe and sand setting pipe, the pebbles having a particle size of 5-15mm.
6. Foundation pit dewatering well according to claim 2, wherein the well is provided with a wellhead communicating with the earth's surface, the well pipe extends out of the wellhead, a clay layer is provided between the outer side of the well pipe near one end of the wellhead and the inner wall of the well, and a sealing layer is provided on the outer side of the well pipe extending out of the wellhead.
7. The foundation pit dewatering well of claim 6, further comprising a seal cap, wherein said seal cap seals a port of said well pipe extending beyond an end of said wellhead.
8. Foundation pit dewatering well according to claim 6, wherein the length of the well pipe extending beyond the wellhead section is 0.2-0.5m.
9. Foundation pit dewatering well according to any one of claims 1-8, wherein the filter tube is made of steel tube, the steel tube is provided with a plurality of filter holes, the inner diameter of the filter holes is 5-10mm, and the ratio of the total area of the plurality of filter holes to the side area of the steel tube is not less than 0.15.
10. Foundation pit dewatering well as claimed in claim 9, characterized in that the filter tube is sleeved with a filter screen, the filter screen being made of 40 mesh steel wire mesh or 40 mesh nylon mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223094248.8U CN218911482U (en) | 2022-11-17 | 2022-11-17 | Foundation pit dewatering well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223094248.8U CN218911482U (en) | 2022-11-17 | 2022-11-17 | Foundation pit dewatering well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218911482U true CN218911482U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223094248.8U Active CN218911482U (en) | 2022-11-17 | 2022-11-17 | Foundation pit dewatering well |
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| Country | Link |
|---|---|
| CN (1) | CN218911482U (en) |
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2022
- 2022-11-17 CN CN202223094248.8U patent/CN218911482U/en active Active
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