CN113062342A - Dewatering well structure in foundation pit and construction method - Google Patents
Dewatering well structure in foundation pit and construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000001556 precipitation Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000009412 basement excavation Methods 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000013461 design Methods 0.000 claims description 23
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 13
- 238000003780 insertion Methods 0.000 claims description 10
- 230000037431 insertion Effects 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 239000003673 groundwater Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 1
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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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- 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
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Abstract
The invention discloses a dewatering well structure in a foundation pit and a construction method, wherein the method comprises the steps of determining the construction position of a dewatering well by measuring and lofting in the foundation pit and making an excavation mark; locally and deeply digging along the digging mark in the foundation pit to form the dewatering well; putting a protective cylinder in the precipitation well, and putting a water pump in the protective cylinder; gravel backfilling is carried out on the super-excavated part around the pile casing; and opening the water pump to pump water until the water level in the foundation pit is reduced to a safe water level. The invention greatly reduces the construction workload of the precipitation well, saves the construction cost, reasonably enlarges the effective precipitation range by matching the submersible pump with the protective cylinder, ensures the precipitation effect, and ensures the construction quality while saving the construction cost.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a dewatering well structure in a foundation pit and a construction method.
Background
Along with the development of urban underground space, large-scale deep basal pit construction is also more and more, control to groundwater during the construction is more and more important, to the soil layer in the excavation scope, for reducing soil body water content, improve soil body shear strength and foundation ditch stability, be convenient for earthwork excavation and construction in the foundation ditch, general precipitation measure reduces groundwater level, because of the foundation ditch area is big for large-scale foundation ditch, if excavation precipitation of precipitation well leads to the construction area too big on a large scale, the construction cost of precipitation well has been increased, and adopt light-duty well point precipitation then hardly to reach the effect of coupling construction requirement, lead to the precipitation effect not good, influence the follow-up construction quality in the foundation ditch.
Disclosure of Invention
The invention mainly aims to provide a dewatering well structure in a foundation pit and a construction method, and aims to solve the problems of high construction cost, construction and the like of a dewatering well in the foundation pit in the prior art.
In order to achieve the purpose, the invention provides a construction method of a dewatering well in a foundation pit, which comprises the following steps:
measuring and lofting in the foundation pit, determining the construction position of the dewatering well, and making an excavation mark;
locally and deeply digging along the digging mark in the foundation pit to form the dewatering well;
putting a protective cylinder in the precipitation well, and putting a water pump in the protective cylinder;
gravel backfilling is carried out on the super-excavated part around the pile casing;
and opening the water pump to pump water until the water level in the foundation pit is reduced to a safe water level.
Preferably, before the steps of measuring lofting in the foundation pit, determining the construction position of the dewatering well and making an excavation mark, the method further comprises the following steps of:
comprehensively excavating in the foundation pit to form a buffer layer, wherein the elevation of the buffer layer is 250-300 mm lower than the design elevation of the foundation pit;
the step of gravel backfilling the overbreak around the casing comprises:
and backfilling the buffer layer to the designed elevation of the foundation pit to form a buffer cushion layer, so that the top of the pile casing is flush with the buffer cushion layer.
Preferably, the step of measuring lofting in the foundation pit, determining the construction position of the dewatering well and making an excavation mark comprises:
dividing the foundation pit into a first foundation pit, a second foundation pit and a third foundation pit according to the design elevation of the foundation pit, wherein the design elevation of the first foundation pit is greater than the design elevation of the second foundation pit, the design elevation of the second foundation pit is greater than the design elevation of the third foundation pit, and the first foundation pit is between the second foundation pit and the third foundation pit;
and respectively measuring the quantity of the excavation marks corresponding to the first foundation pit, the second foundation pit and the third foundation pit according to the areas and the design elevations of the first foundation pit, the second foundation pit and the third foundation pit.
Preferably, after the step of turning on the water pump to pump water until the water level in the foundation pit is lowered to a safe water level, the method further comprises the following steps:
leveling and compacting the foundation pit, and pouring a concrete substrate at the bottom of the foundation pit;
erecting a template on the side wall of the foundation pit, and performing pouring construction on the side wall of the foundation pit to form a waterproof curtain on the side wall of the foundation pit;
and plugging the dewatering well by adopting expansive concrete, and performing waterproof construction in the foundation pit.
Preferably, the step of leveling and compacting the foundation pit and pouring a concrete substrate at the bottom of the foundation pit comprises:
and inserting a fixed steel bar into the foundation pit at intervals of 1-1.5 m, wherein the insertion depth is 1.2-1.5 m, and the insertion depth is 0.3-0.5 m.
Preferably, the step of erecting a formwork of the side wall of the foundation pit and performing pouring construction on the side wall of the foundation pit so as to form a waterproof curtain on the side wall of the foundation pit comprises:
measuring and lofting a side line of the side wall of the foundation pit;
inserting double rows of wall protection reinforcing steel bars into the sidelines, wherein the insertion depth is 0.3-0.5 m;
erecting a template of the side wall of the foundation pit, and performing side wall pouring construction, wherein the thickness of the side wall is not less than 300 mm.
Preferably, after the step of inserting the double rows of the retaining wall reinforcing steel bars at the sidelines to an insertion depth of 0.3m to 0.5m, the method further comprises the following steps:
and arranging a connecting steel bar in the side wall at intervals of 0.5-1 m, wherein the connecting steel bar is perpendicular to the retaining wall steel bar, one end of the connecting steel bar is welded with the retaining wall steel bar, and the other end of the connecting steel bar is connected with the drilling and grouting pile foundation beside the foundation pit.
Preferably, the step of plugging the dewatering well by using the expansive concrete and performing waterproof construction in the foundation pit comprises the following steps:
backfilling the dewatering well by using medium sand to a position 500mm below a wellhead of the dewatering well;
leveling backfill soil in the precipitation well, pouring micro-expansive concrete in the precipitation well, and plugging the precipitation well.
Preferably, the step of placing a casing in the precipitation well and placing a water pump in the casing comprises:
installing a water pump and a matched circuit control facility thereof;
sealing the dewatering well by using a cover plate, and manufacturing a protective guard around a wellhead;
and (4) connecting the water pump to a municipal sewage pipeline network.
The invention also provides a dewatering well structure in the foundation pit, which is constructed by adopting the construction method of the dewatering well in the foundation pit, and comprises the following steps:
a foundation pit;
the dewatering well, the dewatering well sets up in the foundation ditch, install in the dewatering well and protect a section of thick bamboo, it is provided with the water pump in the section of thick bamboo to protect.
The construction method of the dewatering well in the foundation pit determines the construction position of the dewatering well by measuring and lofting in the foundation pit so as to avoid the position of a pile foundation in the foundation pit and the position of a retaining wall of a water collecting pit, thereby avoiding influencing the construction of the whole project, determines the optimal arrangement of the dewatering well by measuring and calculating, achieves the purpose of dewatering by using the least workload and the shortest drainage pipeline, saves the construction cost, greatly reduces the construction workload of the dewatering well by adopting a mode of locally and deeply digging in the foundation pit, saves the construction cost, reasonably enlarges the effective dewatering range by matching a submersible pump with a retaining cylinder, ensures the dewatering effect, and ensures the construction quality while saving the construction cost.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a first embodiment of a dewatering well construction method in a foundation pit according to the present invention;
FIG. 2 is a schematic flow chart of a dewatering well construction method in a foundation pit according to a second embodiment of the present invention;
FIG. 3 is a schematic flow chart of a dewatering well construction method in a foundation pit according to a third embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the dewatering well structure in the foundation pit according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
22 | Wall-protecting reinforcing steel bar |
| 1 | Dewatering well | 101 | |
| 11 | |
102 | Second foundation pit |
| 2 | |
103 | |
| 21 | Connecting reinforcing |
200 | Drilling and pouring pile foundation |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a construction method of a dewatering well in a foundation pit.
Referring to fig. 1, a schematic flow chart of a first embodiment of the method for constructing a dewatering well in a foundation pit of the invention is shown, and the method comprises the following steps:
s100, measuring and lofting in a foundation pit, determining the construction position of a dewatering well, and making an excavation mark;
step S200, performing local deep excavation along the excavation mark in the foundation pit to form the dewatering well 1;
step S300, placing a protective cylinder in the precipitation well, and placing a water pump in the protective cylinder;
step S400, gravel backfilling is carried out on the super-excavated part around the casing;
and S500, opening the water pump to pump water until the water level in the foundation pit is reduced to a safe water level.
In the construction method of the precipitation well in the foundation pit, before the precipitation well 1 is constructed in the foundation pit 100, underground water level actual measurement is carried out for three consecutive days, the precipitation range is 240m2, and according to the surface test of a drilling site, the stratums related to precipitation construction in the foundation pit 100 are loess silty clay, fine medium sand and loess, the building foundation of the embodiment is a drilling cast-in-place pile and a raft, the strength of concrete of the raft is C40, and the bottom elevation of the raft is-15 m; the dewatering well 1 is dug deeply to 2000mm below the designed elevation of the foundation pit 100, the water level is required to be reduced to 500mm below the lowest designed elevation of the foundation pit 100 at least, and the diameter of the pile casing 11 is 800 mm; a plurality of circular holes with the diameter of 8mm are formed in the periphery of the protective cylinder 11, so that the precipitation effect is guaranteed; and protecting a steel of 11 and protecting a section of thick bamboo 11, the steel protects 11 tops of a section of thick bamboo and foundation ditch 100 bottom parallel and level, can effectively support precipitation well 1, prevents that precipitation well 1 from collapsing at the precipitation in-process, guarantees foundation ditch 100 construction quality.
As shown in fig. 4, in the construction method of the dewatering well in the foundation pit of the embodiment, the construction position of the dewatering well 1 is determined by measuring and setting out in the foundation pit 100 so as to avoid the pile foundation position in the foundation pit 100, the position of the retaining wall of the sump pit is avoided, influence on the construction of the whole project is avoided, the optimal arrangement of the dewatering well 1 is determined by measuring and calculating, the purpose of dewatering is achieved with the least workload and the shortest drainage pipeline, the construction cost is saved, the construction workload of the dewatering well 1 is greatly reduced by adopting a mode of locally and deeply digging in the foundation pit 100, the construction cost is saved, the effective dewatering range is reasonably expanded by matching the submersible pump with the retaining cylinder 11, the dewatering effect is ensured, and the construction quality is ensured while the construction cost is saved.
Referring to fig. 2, which is a schematic flow chart of a second embodiment of the method for constructing a dewatering well in a foundation pit according to the present invention, before step S100, the method further includes:
s101, comprehensively excavating in the foundation pit to form a buffer layer, wherein the elevation of the buffer layer is 250-300 mm lower than the design elevation of the foundation pit;
step S400 includes:
and S410, backfilling the buffer layer to the designed elevation of the foundation pit to form a buffer cushion layer, so that the top of the pile casing is flush with the buffer cushion layer.
As shown in fig. 4, the buffer layer is shallowly dug in the foundation pit 100 comprehensively to form a construction surface of the local excavation dewatering well 1, so that effective excavation construction of the dewatering well 1 is guaranteed, the buffer layer is backfilled to the designed elevation of the foundation pit 100 after the excavation construction of the dewatering well 1 is completed, the construction quality of the foundation pit 100 is guaranteed, the phenomenon that the local deep excavation of the dewatering well 1 damages the integral flatness and compactness of the foundation pit 100 is avoided, and the construction quality of the foundation pit 100 is further guaranteed.
Referring to fig. 3, which is a schematic flow chart of a third embodiment of the method for constructing a dewatering well in a foundation pit according to the present invention, based on the first embodiment, the step S100 includes:
step S110, dividing the foundation pit into a first foundation pit, a second foundation pit and a third foundation pit according to the design elevation of the foundation pit, wherein the design elevation of the first foundation pit is greater than the design elevation of the second foundation pit, the design elevation of the second foundation pit is greater than the design elevation of the third foundation pit, and the first foundation pit is between the third foundation pits of the second foundation pit;
and step S120, respectively measuring the number of the excavation marks corresponding to the first foundation pit, the second foundation pit and the third foundation pit according to the areas and the design elevations of the first foundation pit, the second foundation pit and the third foundation pit.
As shown in fig. 4, in the embodiment, different numbers of precipitation wells 1 are designed for positions with different design elevations in a foundation pit 100 by calculating according to actual construction conditions, the design elevations of a first foundation pit 101, a second foundation pit 102 and a third foundation pit 103 of the embodiment are sequentially-18.55 m, -19.4m and-20.5 m, one precipitation well 1 is respectively arranged in each of the first foundation pit 101 and the second foundation pit 102, two precipitation wells 1 are arranged in the third foundation pit 103, a protection cylinder 11 and a water pump are respectively arranged in each precipitation well 1, all the water pumps are simultaneously opened during precipitation, the ordered progress of precipitation is ensured, the precipitation effect is ensured, and the construction quality is improved.
Further, in a fourth embodiment of the present invention, based on the foregoing embodiment, after step S500, the method further includes:
step S501, leveling and compacting the foundation pit, and pouring a concrete base at the bottom of the foundation pit;
step S502, erecting a template of the side wall of the foundation pit, and performing pouring construction on the side wall of the foundation pit to form a waterproof curtain on the side wall of the foundation pit;
and S503, plugging the dewatering well by adopting expanded concrete, and performing waterproof construction in the foundation pit.
After the precipitation construction is completed, the precipitation well 1 is backfilled to the designed elevation of the foundation pit 100, the foundation pit 100 is leveled and compacted, the flatness and compactness of the foundation pit 100 are guaranteed, a concrete base is poured at the bottom of the foundation pit 100, attention should be paid to the fact that concrete cannot enter a pumping well to prevent the well from being blocked during the concrete pouring of the base, then construction of the inner side wall 2 of the foundation pit 100 is conducted, a water-stop curtain is formed, the phenomenon that water rushes into the foundation pit 100 is avoided, meanwhile, the base floats upwards and the side wall 2 deforms due to overlarge water pressure is prevented, finally, the well mouth of the precipitation well 1 is plugged by adopting expansive concrete, follow-up water-proof construction is guaranteed to be normally conducted in the follow-up foundation.
Still further, as a fifth embodiment of the present invention, based on the above fourth embodiment, step S501 includes:
step S5011, inserting a fixed steel bar into the foundation pit at intervals of 1-1.5 m, wherein the insertion depth is 1.2-1.5 m, and the ground is exposed by 0.3-0.5 m.
As shown in fig. 4, in this embodiment, after leveling the foundation pit 100, a measurer accurately lays out a line, and a Φ 25 steel bar is driven into the foundation every 1m as a fixed steel bar, the depth of penetration is 1.5m, and the ground is exposed by 300mm, so that the overall strength of the concrete foundation is improved by the fixed steel bar, the concrete foundation is effectively prevented from floating and deforming due to excessive water pressure, and the construction quality of the foundation pit 100 is ensured.
Based on the above embodiment, as a sixth embodiment of the present invention, step S502 includes:
step S5021, measuring a lofting side wall sideline;
step S5022, inserting double rows of wall protection reinforcing steel bars into the sidelines, wherein the inserting depth is 0.3-0.5 m;
step S5023, erecting the formwork of the side wall, and performing side wall pouring construction, wherein the thickness of the side wall 2 is not less than 300 mm.
As shown in fig. 4, in this embodiment, a measurer pays off a line to the sidewall 2, inserts two vertical rows of Φ 12 retaining steel bars 22 into the sidewall 2 according to the outer edge line, and inserts the two rows of retaining steel bars 22 into the foundation pit 100, thereby further improving the strength of the sidewall 2, avoiding the deformation and damage of the sidewall 2 caused by excessive water pressure, and further improving the construction quality of the foundation pit 100.
Based on the sixth embodiment, a seventh embodiment of the present invention is the seventh embodiment, after step S5022, further including:
and S5024, arranging a connecting steel bar in the side wall at intervals of 0.5-1 m, wherein the connecting steel bar is perpendicular to the retaining wall steel bar, one end of the connecting steel bar is welded with the retaining wall steel bar, and the other end of the connecting steel bar is connected with a drilling and pouring pile foundation beside the foundation pit.
As shown in fig. 4, in the construction method of the dewatering well 1 in the foundation pit 100 according to the embodiment, after the insertion of the retaining wall reinforcing steel bars 22 is completed, the line is accurately paid out again, the position of the retaining wall reinforcing steel bars 22 is rechecked and adjusted, horizontal double rows of phi 12 retaining wall reinforcing steel bars 22 are bound, 1 phi 12 reinforcing steel bar is planted on the peripheral drilling and pouring pile foundation 200 at intervals of 500mm to serve as a connecting reinforcing steel bar 21, after the connecting reinforcing steel bar 21 and the retaining wall reinforcing steel bars 22 are reliably welded, a side wall 2 formwork is erected, and side wall 2C35P8 concrete is poured, wherein the thickness of the concrete is not less than 300mm based on actual pouring; every interval 0.5m sets up a connecting reinforcement 21 in lateral wall 2, and connecting reinforcement 21 is connected dado reinforcing bar 22 and the other drilling bored concrete pile foundation 200 of foundation ditch 100, has further improved the intensity of lateral wall 2, has guaranteed foundation ditch 100 construction quality, has effectively avoided the too big lateral wall 2 deformation and the come-up that leads to of water pressure.
Based on the above embodiment, as an eighth embodiment of the present invention, step S503 includes:
step S5031, backfilling the dewatering well by using medium sand to a position 500mm below a wellhead of the dewatering well;
step S5032, leveling backfill soil in the precipitation well, pouring C35P8 micro-expansion concrete into the precipitation well, and plugging the precipitation well.
In the implementation, after the concrete pouring of the side wall 2 is finished, the template is removed and the backfilling and well sealing treatment is carried out, the backfilling material of the dewatering well 1 adopts medium sand, when the backfilling is carried out to 500mm below the cushion layer, a pump is pumped and the C35P8 micro-expansion concrete is poured, and the top surface elevation of the well sealing concrete is flush with the top of the cushion layer.
Based on the above embodiment, step S300 includes:
step S310, installing a water pump and a matched circuit control facility;
step S320, sealing the dewatering well by using a cover plate, and making protective barriers around a wellhead;
and step S330, connecting the water pump to a municipal sewage pipeline network.
The water pump is installed immediately after the steel casing 11 of this embodiment is installed to carry out comprehensive careful inspection to water pump and control system, try to draw water after qualified, change over to normal work after satisfying the requirement. The next sewage pump with the lift of 25KW and the lift of 100m in each well pumps water, and water in the dewatering well 1 is discharged to a municipal rainwater and sewage pipe network through a dewatering pipe. Underground water level changes in the well are observed in the precipitation process, and detailed records are made, so that the precipitation process is orderly carried out, and the precipitation effect is ensured.
The invention also provides a dewatering well 1 structure in the foundation pit 100, the dewatering well 1 structure in the foundation pit 100 is constructed by adopting the construction method of the dewatering well 1 in the foundation pit 100, the dewatering well 1 structure in the foundation pit 100 comprises the foundation pit 100 and the dewatering well 1, the dewatering well 1 is arranged in the foundation pit 100, a protective cylinder 11 is arranged in the dewatering well 1, and a water pump is arranged in the protective cylinder 11.
As shown in fig. 4, the construction structure of the precipitation well 1 in the foundation pit 100 of the embodiment determines the construction position of the precipitation well 1 by measuring and lofting in the foundation pit 100 so as to avoid the pile position in the foundation pit 100, the position of the retaining wall of the water collecting pit avoids influencing the construction of the whole project, and the optimal arrangement of the precipitation well 1 is determined by measuring and calculating, the purpose of precipitation is achieved by the least workload and the shortest drainage pipeline, the construction cost is saved, the construction workload of the precipitation well 1 is greatly reduced by adopting the mode of locally and deeply digging the foundation pit 100, the construction cost is saved, the effective precipitation range is reasonably enlarged by matching the protection cylinder 11 with the submersible pump, the precipitation effect is ensured, and the construction quality is ensured while the construction cost is saved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A construction method of a dewatering well in a foundation pit is characterized by comprising the following steps:
measuring and lofting in the foundation pit, determining the construction position of the dewatering well, and making an excavation mark;
locally and deeply digging along the digging mark in the foundation pit to form the dewatering well;
putting a protective cylinder in the precipitation well, and putting a water pump in the protective cylinder;
gravel backfilling is carried out on the super-excavated part around the pile casing;
and opening the water pump to pump water until the water level in the foundation pit is reduced to a safe water level.
2. The method for constructing the dewatering well in the foundation pit according to claim 1, wherein before the steps of measuring and setting out a layout in the foundation pit, determining the construction position of the dewatering well and making an excavation mark, the method further comprises the following steps of:
comprehensively excavating in the foundation pit to form a buffer layer, wherein the elevation of the buffer layer is 250-300 mm lower than the design elevation of the foundation pit;
the step of gravel backfilling the overbreak around the casing comprises:
and backfilling the buffer layer to the designed elevation of the foundation pit to form a buffer cushion layer, so that the top of the pile casing is flush with the buffer cushion layer.
3. The method for constructing the dewatering well in the foundation pit according to claim 1, wherein the steps of measuring and setting out a layout in the foundation pit, determining the construction position of the dewatering well and making an excavation mark comprise:
dividing the foundation pit into a first foundation pit, a second foundation pit and a third foundation pit according to the design elevation of the foundation pit, wherein the design elevation of the first foundation pit is greater than the design elevation of the second foundation pit, the design elevation of the second foundation pit is greater than the design elevation of the third foundation pit, and the first foundation pit is between the second foundation pit and the third foundation pit;
and respectively measuring the quantity of the excavation marks corresponding to the first foundation pit, the second foundation pit and the third foundation pit according to the areas and the design elevations of the first foundation pit, the second foundation pit and the third foundation pit.
4. The method for constructing a dewatering well in a foundation pit according to claim 1, wherein after the step of opening the water pump to pump water until the water level in the foundation pit is lowered to a safe water level, the method further comprises:
leveling and compacting the foundation pit, and pouring a concrete substrate at the bottom of the foundation pit;
erecting a template on the side wall of the foundation pit, and performing pouring construction on the side wall of the foundation pit to form a waterproof curtain on the side wall of the foundation pit;
and plugging the dewatering well by adopting expansive concrete, and performing waterproof construction in the foundation pit.
5. The method for constructing the dewatering well in the foundation pit according to claim 4, wherein the step of flattening and compacting the foundation pit and pouring a concrete substrate at the bottom of the foundation pit comprises the following steps:
and inserting a fixed steel bar into the foundation pit at intervals of 1-1.5 m, wherein the insertion depth is 1.2-1.5 m, and the insertion depth is 0.3-0.5 m.
6. The method for constructing the dewatering well in the foundation pit according to claim 4, wherein the step of erecting a formwork of the side wall of the foundation pit and performing pouring construction on the side wall of the foundation pit so as to form a waterproof curtain on the side wall of the foundation pit comprises the following steps of:
measuring and lofting a side line of the side wall of the foundation pit;
inserting double rows of wall protection reinforcing steel bars into the sidelines, wherein the insertion depth is 0.3-0.5 m;
erecting a template of the side wall of the foundation pit, and performing side wall pouring construction, wherein the thickness of the side wall is not less than 300 mm.
7. The method for constructing the dewatering well in the foundation pit according to claim 6, wherein after the step of inserting the double rows of the retaining wall reinforcing steel bars at the sidelines to the insertion depth of 0.3m to 0.5m, the method further comprises the following steps of:
and arranging a connecting steel bar in the side wall at intervals of 0.5-1 m, wherein the connecting steel bar is perpendicular to the retaining wall steel bar, one end of the connecting steel bar is welded with the retaining wall steel bar, and the other end of the connecting steel bar is connected with the drilling and grouting pile foundation beside the foundation pit.
8. The method for constructing the dewatering well in the foundation pit according to claim 4, wherein the step of plugging the dewatering well with the expansive concrete and performing the waterproof construction in the foundation pit comprises the following steps:
backfilling the dewatering well by using medium sand to a position 500mm below a wellhead of the dewatering well;
leveling backfill soil in the precipitation well, pouring micro-expansive concrete in the precipitation well, and plugging the precipitation well.
9. The method for constructing a dewatering well in a foundation pit according to any one of claims 1 to 8, wherein the step of placing a casing in the dewatering well and placing a water pump in the casing comprises the following steps:
installing a water pump and a matched circuit control facility thereof;
sealing the dewatering well by using a cover plate, and manufacturing a protective guard around a wellhead;
and (4) connecting the water pump to a municipal sewage pipeline network.
10. The dewatering well structure in the foundation pit is constructed by the construction method of the dewatering well in the foundation pit according to claims 1 to 9, and comprises the following steps:
a foundation pit;
the dewatering well, the dewatering well sets up in the foundation ditch, install in the dewatering well and protect a section of thick bamboo, it is provided with the water pump in the section of thick bamboo to protect.
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