CN114045850A - Construction method for replacing waterproof curtain by combination of light well point and pneumatic dewatering - Google Patents
Construction method for replacing waterproof curtain by combination of light well point and pneumatic dewatering Download PDFInfo
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- CN114045850A CN114045850A CN202111462130.3A CN202111462130A CN114045850A CN 114045850 A CN114045850 A CN 114045850A CN 202111462130 A CN202111462130 A CN 202111462130A CN 114045850 A CN114045850 A CN 114045850A
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000009412 basement excavation Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 238000005553 drilling Methods 0.000 claims description 27
- 238000001556 precipitation Methods 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 12
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000004044 response Effects 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
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
- E02D2250/0084—Production methods for working underwater using pneumatical means
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Abstract
The invention discloses a construction method for replacing a waterproof curtain by combining a light well point and pneumatic dewatering, which comprises the following steps of S1, sequentially carrying out measurement and setting-out on a plurality of layers of foundation pits according to the excavation sequence of the foundation pits; s2, determining well positions of a plurality of pneumatic dewatering pipe wells according to the top foundation pit side line determined by the measurement and setting-out, constructing the pneumatic dewatering pipe wells one by one, and excavating foundation pits in the top foundation pit side line after the top dewatering is completed by constructors; s3, determining the well positions of a plurality of well point pipes in the light well points according to the next layer of foundation pit side line determined by the measurement and setting-out, constructing the well point pipes one by one, after the light well point construction is finished, arranging a plurality of pneumatic dewatering pipe wells on the inner side of the next layer of foundation pit side line, constructing the pneumatic dewatering pipe wells one by one, and excavating the foundation pit in the next layer of foundation pit side line after the whole dewatering and drainage construction is finished. Compared with the traditional waterproof curtain, the waterproof curtain has the advantages of high safety level, good waterproof effect, obvious energy-saving and consumption-reducing results and high economic benefit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for replacing a waterproof curtain by combining a light well point and pneumatic dewatering.
Background
Along with the gradual improvement of economic strength of China, urban construction is rapidly developed, various large buildings are gradually increased, the excavation area of a foundation pit of the large building is wide, the excavation depth is large, underground water systems are abundant, the construction difficulty of a foundation and foundation engineering is large, the cost is high, and the safety and the reliability of the foundation are greatly influenced by large building groups on the ground.
In the foundation ditch work progress, often adopt the method of stagnant water curtain to come the foundation ditch stagnant water, but among the actual work progress, because factors such as geological conditions, construction technology and foundation ditch degree of depth, the risk of local seepage often can appear in the stagnant water curtain to along with the increase of foundation ditch degree of depth, the risk of the local seepage of stagnant water curtain increases, seriously influences foundation ditch security, and traditional stagnant water curtain simultaneously, engineering cost is high, and economic benefits is low.
Disclosure of Invention
The invention aims to provide a construction method for replacing a waterproof curtain by combining a light well point and a pneumatic dewatering device.
The technical scheme of the invention is as follows: a construction method for replacing a waterproof curtain by combining a light well point and pneumatic dewatering comprises the following steps:
s1, sequentially carrying out measurement setting-out on the multiple layers of foundation pits according to the excavation sequence of the foundation pits;
s2, determining well positions of a plurality of pneumatic downcast pipe wells according to the top foundation pit side line determined by the measurement and setting-out, wherein the well positions of the plurality of pneumatic downcast pipe wells are positioned on the inner side and the outer side of the top foundation pit side line, constructing the pneumatic downcast pipe wells one by one according to the well positions of the pneumatic downcast pipe wells, and excavating foundation pits in the top foundation pit side line after the top dewatering is completed by constructors;
s3, determining the well positions of a plurality of well point pipes in the light well points according to the next layer of foundation pit side line determined by the measurement and setting-out, wherein the well positions of the plurality of well point pipes are positioned at the outer ring of the next layer of foundation pit side line, constructing the well point pipes one by one according to the well positions of the well point pipes, after the construction of the light well points is finished, arranging a plurality of pneumatic dewatering pipe wells at the inner side of the next layer of foundation pit side line, constructing the pneumatic dewatering pipe wells one by one, and excavating the foundation pit in the next layer of foundation pit side line after the construction of the integral dewatering is finished.
Further, the construction of the pneumatic downcomer well comprises the following steps:
1) arranging the mouth protecting pipe on the well position of the pneumatic downcast pipe well, and making sealing measures on the periphery of the mouth protecting pipe;
2) installing a drilling machine on one side of the well position of the pneumatic downcomer well, and drilling a well hole on the well position by using the drilling machine;
3) putting the pneumatic dewatering pipe well into the drilled well hole;
4) filling the gravel material between the pneumatic downcast pipe well and the aquifer, and filtering water through the gravel material to prevent fine sand in the aquifer from flowing into the pneumatic downcast pipe well;
5) removing mud from the well wall and mud from the pneumatic downcomer well into the aquifer;
6) arranging a pneumatic pump in each pneumatic downcomer well, and connecting the pneumatic pump with a controller;
7) the pneumatic pump is controlled by the controller to pump water to the pneumatic downcomer well, and the pumped water is discharged to the outside of the pneumatic downcomer well through the drain pipe.
Further, in the step 2), during the drilling process, the drill rod in the drilling machine is slightly pressed and slowly rotated to ensure the vertical degree of the drilled hole, and the mud is adopted to protect the wall to prevent the well hole from collapsing.
Further, in the step 3), the process of placing the pneumatic downcomer well into the drilled well hole is continuously performed, and when the pneumatic downcomer well cannot be smoothly placed into the preset placing position due to mechanical failure, the pneumatic downcomer well is pulled out, and the drilled hole is cleaned and then placed into the pneumatic downcomer well again.
Furthermore, in the step S2, the plurality of pneumatic downcomer wells outside the top foundation pit side line are divided into two rows along the periphery of the top foundation pit side line, the center distance between two adjacent pneumatic downcomer wells in one row outside is 11 to 13m, the center distance between two adjacent pneumatic downcomer wells in one row inside is 9 to 11m, the plurality of pneumatic downcomer wells inside the top foundation pit side line are uniformly distributed, and the center distance between two adjacent pneumatic downcomer wells is 14 to 17 m.
Furthermore, in step S3, the plurality of well pipes are annularly arranged around the side line of the next layer of foundation pit, and the well pipes are spaced from the side line of the next layer of foundation pit by a distance of 0.7m to 1.2 m.
Still further, the well site tubular construction comprises the steps of:
installing a drilling machine on one side of the well position of the well point pipe, and drilling a hole on the well position through the drilling machine;
after a well hole of the well point pipe is drilled, putting the well point pipe into the well hole, filling gravel and washing the well, connecting the well point pipe with a connecting pipe, connecting the other end of the connecting pipe with a conversion joint, and connecting the other end of the connecting pipe with a water collecting main pipe through the conversion joint, wherein the water collecting main pipe is connected with a water pumping device;
after the connection of all parts of the well point pipe is completed, the water pumping equipment is debugged to pump water.
Compared with the prior art, the invention has the beneficial effects that:
1. the light well point and the pneumatic dewatering combined construction is adopted, the light well point and the pneumatic dewatering pipe well are arranged at the edge and inside of the foundation pit and combined, so that a water stopping body can be established to prevent outside water from entering the foundation pit, and meanwhile, the water level in the foundation pit can be reduced;
2. compared with the traditional waterproof curtain, the construction method has high safety level and good waterproof effect, as the excavation depth of the top layer foundation pit is shallow, pneumatic dewatering technology is adopted around the outer edge of the foundation pit and inside the foundation pit, the dewatering effect meets the requirement, the excavation depth of the next layer of foundation pit is deep, light well points are adopted around the foundation pit to replace the waterproof curtain, a waterproof body is established through light well point dewatering to prevent outside water from entering the foundation pit, meanwhile, pneumatic dewatering is adopted inside the foundation pit, the two measures are combined to enable the foundation pit to be located in a waterless area to facilitate foundation construction, meanwhile, the leakage risk of the traditional waterproof curtain is avoided, and the safety and reliability of the foundation pit are improved;
3. the pneumatic dewatering is adopted to replace the traditional water pump in the dewatering method, and the method has obvious advantages:
1) the water pump is not easy to damage and is more reliable, and the construction site is safe and tidy;
2) the traditional water pump cannot realize automatic control of foundation pit dewatering, the dewatering efficiency is low, the automatic control device is adopted to control the pneumatic dewatering process, the problem of idling of the traditional water pump can be solved, the dewatering process is more convenient, meanwhile, the proper air source pressure and the time delay response time can be adjusted according to the actual engineering condition, the proper pneumatic dewatering parameters are selected, and the dewatering process is effectively controlled;
3) in the actual dewatering process, the foundation pit water level condition can be continuously controlled, the working condition of the pneumatic dewatering equipment is adjusted according to the change of the foundation pit water level, and the foundation pit water level is guaranteed to meet the construction operation requirement.
4. Compared with the traditional waterproof curtain, the construction method has the advantages that the cost is reasonably saved on the premise of ensuring the safety, the energy-saving and consumption-reducing effects are obvious, and the economic benefit is high.
Drawings
FIG. 1 is a flow chart of the construction of the present invention;
FIG. 2 is a view of the combined precipitation arrangement of the present invention;
fig. 3 is a connection diagram of a well point pipe and a water collecting main pipe in the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature; in the description of the invention, "a plurality" means two or more unless otherwise specified.
Examples
As shown in fig. 1 to 3, the present invention provides a construction method for replacing a waterproof curtain by a combination of a light well point and a pneumatic precipitation, comprising the steps of:
s1, sequentially carrying out measurement setting-out on the multiple layers of foundation pits according to the excavation sequence of the foundation pits;
s2, determining well positions of a plurality of pneumatic dewatering pipe wells 3 according to a top foundation pit side line 1 determined by measurement and setting-out, respectively arranging two rows of pneumatic dewatering pipe wells 3 around the periphery of the top foundation pit side line 1, wherein the center distance between every two adjacent pneumatic dewatering pipe wells 3 in the outer row is 11-13 m, the center distance between every two adjacent pneumatic dewatering pipe wells 3 in the inner row is 9-11 m, uniformly arranging the plurality of pneumatic dewatering pipe wells 3 in the top foundation pit side line 1, the center distance between every two adjacent pneumatic dewatering pipe wells 3 is 14-17 m, constructing the pneumatic dewatering pipe wells 3 one by one according to the well positions of the pneumatic dewatering pipe wells 3, finishing the construction of the pneumatic dewatering pipe wells 3, and excavating and constructing the foundation pit in the top foundation pit side line 1 by constructors after finishing dewatering on the top foundation pit side line 1;
s3, determining the well positions of a plurality of well point pipes 7 in a light well point 4 according to the next layer of foundation pit side line 2 determined by measuring and setting-out, wherein the plurality of well point pipes 7 are arranged in an annular mode and surround the outer circle around the next layer of foundation pit side line 2, the distance between the well point pipes 7 and the next layer of foundation pit side line 2 is 0.7-1.2 m, constructing the well point pipes 7 one by one according to the well positions of the well point pipes 7, after the construction of the light well point 4 is finished, arranging a plurality of pneumatic water-reducing pipe wells 3 on the inner side of the next layer of foundation pit side line 2, constructing the pneumatic water-reducing pipe wells 3 one by one, forming a combined water-reducing system by the pneumatic water-reducing pipe wells 3 and the light well point 4, and digging a foundation pit in the next layer of foundation pit side line 2 after the whole water-reducing and draining construction is finished.
And repeating the step S3 when the precipitation construction is carried out on the deeper foundation pit subsequently.
Wherein, the concrete construction flow of 3 construction of pneumatic downpipe well in this embodiment is:
1) arranging the mouth protecting pipe on the well position of the pneumatic downcast pipe well, and making sealing measures on the periphery of the mouth protecting pipe;
2) installing a drilling machine on one side of a well position of the pneumatic downcast pipe well, drilling a well hole on the well position by using the drilling machine, in the drilling process, slightly pressing and slowly rotating a drill rod in the drilling machine to ensure the vertical degree of the drilled hole, adopting slurry to protect a wall to prevent the well hole from collapsing, when the drilling depth reaches the design depth, drilling 0.3-0.5 m more, simultaneously, timely notifying related units when the geological condition is inconsistent with the exploration design data, and starting hole cleaning and slurry changing when the top surface of a water-bearing stratum is drilled;
3) slowly putting the pneumatic downcomer well into the drilled well, continuously carrying out the putting process, pulling out the pneumatic downcomer well when the pneumatic downcomer well cannot be smoothly put into a preset placing position due to mechanical faults, cleaning the drilled hole and putting in the drilled hole again;
4) filling the gravel material between the pneumatic downcast pipe well and the aquifer, and filtering water through the gravel material to prevent fine sand in the aquifer from flowing into the pneumatic downcast pipe well;
5) removing mud from the well wall and mud from the pneumatic downcomer well into the aquifer;
6) arranging a pneumatic pump in each pneumatic downcomer well, and connecting the pneumatic pump with a controller;
7) the pneumatic pump is controlled by the controller to pump water to the pneumatic downcomer well, and the pumped water is discharged to the outside of the pneumatic downcomer well through the drain pipe.
Wherein, this embodiment carries out the step of being under construction to the well point pipe and includes:
installing a drilling machine on one side of the well position of the well point pipe 7, drilling a hole on the well position, when the drilling depth reaches the design depth, drilling for 0.3-0.5 m more, and simultaneously informing relevant units when the geological condition is inconsistent with the exploration design data, and when the geological condition is drilled to the top surface of the water-bearing stratum, cleaning the hole and changing the slurry;
after a well hole of the well point pipe 7 is drilled, putting the well point pipe 7 into the well hole for gravel filling and well flushing, connecting the well point pipe 7 with the connecting pipe 6, and connecting the other end of the connecting pipe 6 with the adapter 8 and the water collecting main pipe 5 through the adapter 8; the water collecting main pipe 5 is connected with a pumping device;
after the connection of all parts of the well point pipe is completed, the water pumping equipment is debugged to pump water.
It should be noted that, by using the dewatering construction method of the present invention, well points, dewatering flow, groundwater level, and pore water pressure need to be monitored.
Specific application examples are as follows:
the project of the Bohai advanced technology research institute (first period) built by Zhongji third Highway engineering office Limited is positioned on the north side of the five routes of the Yangtze river in the Binchough city of Binzhou, between the twenty routes of the Bohai and the twenty routes of the Bohai, and the project is started in 2019 and completed in 2021 within 12 months. The proposed site is 720 meters in east-west direction and 680 meters in south-north direction, and comprises 16 single buildings, wherein the comprehensive service center is 17 floors above the ground, the creative design center is 12 floors above the ground, the floors A-1 and A-3 are 8 floors above the ground, other buildings are no more than 6 floors above the ground, the underground part comprehensive service center and the inspection and detection center are 2 floors, and the rest are 1 floor. According to geological survey reports, the type of underground water of the site is fourth series of holes and diving, the upper soil layer is mainly cohesive soil and silt, the excavation depth of the foundation pit of the engineering is large, the bottom of the foundation pit is positioned below the ground water level, and a plurality of potential safety hazards such as foundation pit instability, foundation pit water outlet, ground settlement and the like exist during foundation pit precipitation and excavation. In actual engineering, the light well point and pneumatic precipitation combination is adopted to replace the process construction of the waterproof curtain, so that the safety level is high, the waterproof effect is good, the economy and the efficiency are high, and the waterproof curtain is further popularized and applied.
Compared with the traditional waterproof curtain, the construction method has the advantages that the cost is reasonably saved on the premise of ensuring safety, the energy-saving and consumption-reducing effects are obvious, the economic benefit is high, and in terms of foundation pit construction of the Bohai advanced technology research institute project in the Bin city, the project detection center has 185 mouths of dewatering wells, so that the economical efficiency of the construction method and the traditional waterproof curtain is comprehensively compared.
1) Traditional waterproof curtain: a water-stop curtain 650m is arranged at the edge of a foundation pit by adopting a traditional construction process, a downcast pipe well 102 opening is constructed in the foundation pit, and the specific cost is calculated as follows:
a waterproof curtain part: the waterproof curtain adopts phi 800 cement mixing secant pile, the length of a single pile of the mixing pile is 15.5m according to the depth of the foundation pit, the total length of the foundation pit is 650m, the total length of the mixing pile is 5580m, the cement mixing pile is 325 yuan/linear meter, and the total is 1813500 yuan;
the precipitation part: the precipitation period is 120 days, the cost of an electric pump, an electric wire, maintenance and the like is comprehensively considered, namely 110925 yuan, the electric charge is 258508 yuan, and the total amount is 259617 yuan, wherein the electric pump and the electric wire are basically used once;
in conclusion, the total cost of the construction of the traditional waterproof curtain is 2073117 yuan.
2) The construction process is adopted
Pneumatic dewatering part
The precipitation part is wholly covered by labor, 185 wells are constructed on the spot totally, 30 yuan is rented for each well day, 120 days are used, and the total cost is 666000 yuan;
light well-point dewatering
The total construction of light well points is 480m, each group of 30m (30 well point pipes) is 16 groups, the construction cost of each group is 240 yuan, the daily rent of each well point pipe is 10 yuan, the total use time is 120 days, and the total amount is 579840 yuan;
in conclusion, the total cost of the construction process is 1245840 yuan.
3) Comprehensive comparison
Compared with the traditional waterproof curtain construction, the cost of the combined precipitation is reduced by 827277 yuan.
The above disclosure is only for the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be made by those skilled in the art are within the scope of the present invention.
Claims (7)
1. A construction method for replacing a waterproof curtain by combining a light well point and pneumatic dewatering is characterized by comprising the following steps:
s1, sequentially carrying out measurement setting-out on the multiple layers of foundation pits according to the excavation sequence of the foundation pits;
s2, determining well positions of a plurality of pneumatic downcast pipe wells according to the top foundation pit side line determined by the measurement and setting-out, wherein the well positions of the plurality of pneumatic downcast pipe wells are positioned on the inner side and the outer side of the top foundation pit side line, constructing the pneumatic downcast pipe wells one by one according to the well positions of the pneumatic downcast pipe wells, and excavating foundation pits in the top foundation pit side line after the top dewatering is completed by constructors;
s3, determining the well positions of a plurality of well point pipes in the light well points according to the next layer of foundation pit side line determined by the measurement and setting-out, wherein the well positions of the plurality of well point pipes are positioned at the outer ring of the next layer of foundation pit side line, constructing the well point pipes one by one according to the well positions of the well point pipes, after the construction of the light well points is finished, arranging a plurality of pneumatic dewatering pipe wells at the inner side of the next layer of foundation pit side line, constructing the pneumatic dewatering pipe wells one by one, and excavating the foundation pit in the next layer of foundation pit side line after the construction of the integral dewatering is finished.
2. The construction method for replacing a waterproof curtain by combining a light well point and pneumatic dewatering according to claim 1, wherein the construction of the pneumatic dewatering well comprises the following steps:
1) arranging the mouth protecting pipe on the well position of the pneumatic downcast pipe well, and making sealing measures on the periphery of the mouth protecting pipe;
2) installing a drilling machine on one side of the well position of the pneumatic downcomer well, and drilling a well hole on the well position by using the drilling machine;
3) putting the pneumatic dewatering pipe well into the drilled well hole;
4) filling the gravel material between the pneumatic downcast pipe well and the aquifer, and filtering water through the gravel material to prevent fine sand in the aquifer from flowing into the pneumatic downcast pipe well;
5) removing mud from the well wall and mud from the pneumatic downcomer well into the aquifer;
6) arranging a pneumatic pump in each pneumatic downcomer well, and connecting the pneumatic pump with a controller;
7) the pneumatic pump is controlled by the controller to pump water to the pneumatic downcomer well, and the pumped water is discharged to the outside of the pneumatic downcomer well through the drain pipe.
3. The construction method for replacing a waterproof curtain by combining a light well point and pneumatic dewatering as claimed in claim 2, wherein in the step 2), during drilling, a drill rod in a drilling machine is slightly pressed and slowly rotated to ensure the verticality of a drilled hole, and mud is used for protecting the wall to prevent the collapse of the well hole.
4. The construction method for replacing a waterproof curtain by a combination of a light well point and a pneumatic dewatering device according to claim 2, wherein the step 3) of putting the pneumatic dewatering well into the drilled well is performed continuously, and when the pneumatic dewatering well cannot be put into a preset placing position successfully due to mechanical failure, the pneumatic dewatering well is pulled out, and the drilled well is cleaned and put into the well again.
5. The construction method for replacing the waterproof curtain by the combination of the light well point and the pneumatic dewatering according to claim 1, wherein in the step S2, the plurality of pneumatic dewatering wells outside the side line of the top foundation pit are divided into two rows along the periphery of the side line of the top foundation pit, the center distance between two adjacent pneumatic dewatering wells in the outer row is 11-13 m, the center distance between two adjacent pneumatic dewatering wells in the inner row is 9-11 m, the plurality of pneumatic dewatering wells inside the side line of the top foundation pit are uniformly arranged, and the center distance between two adjacent pneumatic dewatering wells is 14-17 m.
6. The construction method of claim 1, wherein in step S3, the plurality of well pipes are annularly arranged around the side of the next layer of foundation pit, and the distance between the well pipes and the side of the next layer of foundation pit is 0.7-1.2 m.
7. The construction method for replacing a waterproof curtain by combining a light well point and pneumatic precipitation according to claim 1, wherein the well point pipe construction comprises the following steps:
installing a drilling machine on one side of the well position of the well point pipe, and drilling a hole on the well position through the drilling machine;
after a well hole of the well point pipe is drilled, putting the well point pipe into the well hole, filling gravel and washing the well, connecting the well point pipe with a connecting pipe, connecting the other end of the connecting pipe with a conversion joint, and connecting the other end of the connecting pipe with a water collecting main pipe through the conversion joint, wherein the water collecting main pipe is connected with a water pumping device;
after the connection of all parts of the well point pipe is completed, the water pumping equipment is debugged to pump water.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837207A (en) * | 2022-05-13 | 2022-08-02 | 北京城建集团有限责任公司 | Foundation pit dewatering structure and method |
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| CN112593566A (en) * | 2020-11-24 | 2021-04-02 | 浙江二十冶建设有限公司 | Dewatering method for existing building deep foundation pit |
| CN113356229A (en) * | 2021-06-21 | 2021-09-07 | 中铁十二局集团有限公司 | Safe and efficient comprehensive construction method for garage under high-speed railway base |
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2021
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| DE19525724C1 (en) * | 1995-06-19 | 1997-06-19 | Bauer Spezialtiefbau | Method of excavation ground water base sealing |
| CN112593566A (en) * | 2020-11-24 | 2021-04-02 | 浙江二十冶建设有限公司 | Dewatering method for existing building deep foundation pit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837207A (en) * | 2022-05-13 | 2022-08-02 | 北京城建集团有限责任公司 | Foundation pit dewatering structure and method |
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