CN114837207A - Foundation pit dewatering structure and method - Google Patents
Foundation pit dewatering structure and method Download PDFInfo
- Publication number
- CN114837207A CN114837207A CN202210524759.4A CN202210524759A CN114837207A CN 114837207 A CN114837207 A CN 114837207A CN 202210524759 A CN202210524759 A CN 202210524759A CN 114837207 A CN114837207 A CN 114837207A
- Authority
- CN
- China
- Prior art keywords
- foundation pit
- well
- water
- dewatering
- precipitation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 134
- 238000001556 precipitation Methods 0.000 claims abstract description 75
- 238000010276 construction Methods 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 230000003204 osmotic effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000008595 infiltration Effects 0.000 abstract description 3
- 238000001764 infiltration Methods 0.000 abstract description 3
- 101150054854 POU1F1 gene Proteins 0.000 description 36
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000009189 diving Effects 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000218737 Mycobacterium phage Power Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E02D19/08—Restraining of underground water by employing open ditches arranged below the level of the water
-
- 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
-
- 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/32—Prefabricated piles with arrangements for setting or assisting in setting in position by fluid jets
Abstract
The invention relates to the technical field of foundation pit dewatering, and provides a foundation pit dewatering structure and a method, wherein the foundation pit dewatering structure at least comprises the following components: a foundation pit; the triaxial mixing piles are arranged along the circumferential direction of the foundation pit so as to form a closed waterproof curtain around the foundation pit; the first dewatering well is arranged in the foundation pit; and the first pneumatic water descending pump is arranged in the first precipitation well and is suitable for pumping the water body in the first precipitation well to the outside of the foundation pit. According to the foundation pit dewatering structure provided by the invention, the three-shaft stirring piles are adopted to form the closed water-stop curtain around the foundation pit, so that the underground water is prevented from permeating into the foundation pit, meanwhile, the water body in the first dewatering well is pumped out of the foundation pit through the first dewatering well and the first pneumatic dewatering pump, and the problems of slope instability, quicksand, pit bottom uplift, pit bottom piping, foundation bearing capacity reduction and the like caused by continuous infiltration of the underground water into the pit are prevented. Moreover, the construction cost is reduced, potential safety hazards are eliminated, and the site safety and civilized construction image is obviously improved.
Description
Technical Field
The invention relates to the technical field of foundation pit dewatering, in particular to a foundation pit dewatering structure and a foundation pit dewatering method.
Background
In order to improve the current situation of water environment pollution, the construction of a regeneration water treatment plant is more and more emphasized in various places for recycling, purifying and reusing sewage. However, the contradiction between the construction of the regeneration water treatment plant and the urban construction land and the surrounding environment still exists, and the construction problem of the sewage plant in the central urban area of the domestic large-scale city is particularly outstanding. With the development and utilization of urban underground space, the arrangement form of sewage treatment plants is gradually developed from above ground to semi-underground or full-underground. The total underground regeneration water treatment plant is characterized in that water treatment structures are arranged in a total underground centralized manner, ecological landscape is introduced into a city, the upper part of the structures is constructed into an artificial wetland protection area, and the construction land is returned to the city.
However, the foundation pit dewatering is an important construction link in the deep foundation pit construction, most of foundation pit accidents are related to underground water, and if the foundation pit dewatering method is improper, the underground water continuously infiltrates into the pit, so that the problems of slope instability, quicksand, pit bottom uplift, pit bottom piping, foundation bearing capacity reduction and the like can be caused.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that the underground water continuously seeps into the pit due to improper foundation pit dewatering method in the prior art, so that the slope instability, sand running, pit bottom bulge, pit bottom piping and foundation bearing capacity are reduced, and the foundation pit dewatering structure and the foundation pit dewatering method are provided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a foundation pit dewatering structure comprising at least: a foundation pit; the triaxial mixing piles are arranged along the circumferential direction of the foundation pit so as to form a closed waterproof curtain around the foundation pit; the first dewatering well is arranged in the foundation pit; and the first pneumatic precipitation pump is arranged in the first precipitation well and is suitable for pumping the water body in the first precipitation well to the outside of the foundation pit.
Furthermore, the wall surface of the foundation pit is of a multi-stage stepped structure, and an inclined surface is arranged between every two adjacent stepped surfaces; the ladder face with the bottom of foundation ditch all is provided with first precipitation well.
Further, the foundation pit dewatering structure further comprises a second dewatering well and a second pneumatic dewatering well; the second dewatering well is arranged at the bottom of the foundation pit; the second pneumatic water descending pump is arranged in the second precipitation well and is suitable for pumping the water body in the second precipitation well to the outside of the foundation pit; the first dewatering well and the second dewatering well are different in position, and the depth of the first dewatering well is smaller than that of the second dewatering well.
Further, this foundation ditch precipitation structure still includes the relief well, sets up the bottom of foundation ditch, and with the position of first precipitation well is different.
Furthermore, this foundation ditch precipitation structure still includes dive observation well, follows the circumference setting of foundation ditch is in the outward flange of foundation ditch is suitable for the water level variation of the dive of observation foundation ditch surrounding environment in the work progress.
Furthermore, the foundation pit dewatering structure further comprises a confined water observation well, wherein the confined water observation well is arranged at the outer edge of the foundation pit along the circumferential direction of the foundation pit, and is suitable for observing the water level change of confined water in the surrounding environment of the foundation pit in the construction process.
Furthermore, the foundation pit dewatering structure also comprises a water retaining platform which is arranged at the outer edge of the foundation pit along the circumferential direction of the foundation pit; the submersible observation well is positioned on one side of the water retaining platform close to the foundation pit; the confined water observation well is positioned on one side of the water retaining platform close to the foundation pit.
Furthermore, the foundation pit dewatering structure also comprises a water collecting ditch which is arranged at the bottom of the foundation pit along the circumferential direction of the foundation pit and is suitable for collecting the accumulated water at the bottom of the foundation pit; the water collecting ditch is communicated with the first dewatering well so that collected accumulated water flows into the first dewatering well.
A foundation pit dewatering method comprises the following steps: arranging three-axis stirring piles around the foundation pit to form a closed waterproof curtain around the foundation pit; arranging a plurality of precipitation wells in the foundation pit, and pumping water in the precipitation wells to the outside of the foundation pit by adopting a pneumatic precipitation pump; arranging a water collecting channel at the bottom of the foundation pit to collect the accumulated water in the foundation pit and discharging the collected accumulated water into a precipitation well; arranging a water retaining platform at the periphery of the foundation pit to prevent water outside the foundation pit from flowing back into the foundation pit; arranging a relief well at the bottom of the foundation pit to reduce the pressure-bearing water pressure and the osmotic pressure in the foundation pit; and arranging an observation well at the periphery of the foundation pit to observe the water level change at the periphery of the foundation pit.
Furthermore, the dewatering wells are sand-free pipe wells and comprise two different depths; the observation well comprises a submersible observation well and a confined water observation well, wherein the submersible observation well adopts a sand-free pipe well, and the depth of the sand-free pipe well is smaller than that of the dewatering well; the confined water observation well adopts a steel pipe well, and the depth of the confined water observation well is greater than that of the dewatering well; the relief well adopts a steel pipe well, and the depth of the relief well is greater than that of the pressure-bearing water observation well.
The technical scheme of the invention has the following advantages:
according to the foundation pit dewatering structure provided by the invention, the three-shaft stirring piles are adopted to form the closed waterproof curtain around the foundation pit, so that underground water is prevented from permeating into the foundation pit, and meanwhile, a water body in the first dewatering well is pumped to the outside of the foundation pit through the first dewatering well and the first pneumatic dewatering pump. The problems of instability of a side slope, sand flowing, pit bottom uplift, pit bottom piping, foundation bearing capacity reduction and the like caused by continuous infiltration of underground water into the pit are solved. And moreover, the first pneumatic water descending pump is adopted for dewatering construction, so that the potential safety hazard of electricity utilization and the influence caused by frequent disassembly and modification of construction site cross operation are effectively eliminated, and meanwhile, the dewatering efficiency of the foundation pit is greatly improved.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a top view of a precipitation structure of a foundation pit according to an embodiment of the invention;
FIG. 2 is a partial cross-sectional view of a precipitation structure of a foundation pit in an embodiment of the invention;
fig. 3 is a flowchart of a method for lowering water in a foundation pit according to an embodiment of the present invention.
1. A foundation pit; 2. A triaxial mixing pile; 3. A first dewatering well;
4. a second dewatering well; 5. A relief well; 6. A confined water observation well;
7. a submersible observation well; 8. A step surface; 9. And (4) collecting the water.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
FIG. 1 is a top view of a precipitation structure of a foundation pit according to an embodiment of the invention; as shown in fig. 1, this embodiment provides a foundation ditch precipitation structure, includes at least: the foundation pit 1, for example, the foundation pit 1 may be a foundation pit 1 having a rectangular cross-sectional shape; the triaxial mixing piles 2 are arranged along the circumferential direction of the foundation pit 1 so as to form a closed waterproof curtain around the foundation pit 1; and the first dewatering well 3 is arranged in the foundation pit 1. For example, a plurality of first precipitation wells 3 may be uniformly arranged at the bottom of the foundation pit 1 in an array, and the interval between two adjacent first precipitation wells 3 may be designed according to the actual size of the foundation pit 1; the first pneumatic precipitation pump is arranged in the first precipitation well 3 and is suitable for pumping the water body in the first precipitation well 3 to the outside of the foundation pit 1, and for example, the first pneumatic precipitation pump and the first precipitation well 3 can be arranged in a one-to-one correspondence manner. For the first pneumatic water descending pump, the automatic start and stop of the first pneumatic water descending pump can be realized through a sensor and a frequency converter; the first pneumatic water descending pump is controlled by a gas pipeline. When the pneumatic dewatering device is used, the first pneumatic dewatering pump is placed at the bottom of the first dewatering well 3, the first pneumatic dewatering pump is provided with an air inlet pipe and an air outlet pipe, and air is blown into the first pneumatic dewatering pump intermittently every eight seconds through the air compressor. When no air pressure exists, a water inlet of the first pneumatic water descending pump is opened, and water enters the first pneumatic water descending pump; when air pressure exists, the water inlet of the first pneumatic water descending pump is closed, and water in the first pneumatic water descending pump is pressed into the water outlet pipe by the air pressure.
The foundation ditch precipitation structure that this embodiment provided adopts triaxial stirring stake 2 to form confined water stop curtain around foundation ditch 1, prevents that groundwater from permeating to foundation ditch 1 in, simultaneously, through first precipitation well 3 and first pneumatic precipitation pump, with the water pump sending in first precipitation well 3 outside foundation ditch 1. The problems of instability of a side slope, sand flowing, pit bottom uplift, pit bottom piping, foundation bearing capacity reduction and the like caused by continuous infiltration of underground water into the pit are solved. And, adopt first pneumatic precipitation pump precipitation construction, effectively eliminated power consumption potential safety hazard and construction site cross operation need frequently tear open the influence that changes and bring, also improved foundation ditch 1 precipitation efficiency simultaneously greatly, because first pneumatic precipitation pump uses the gas pipeline control air pump, reduced power consumption block terminal in a large number than traditional precipitation mode, the power consumption cable has reduced construction cost, has eliminated the potential safety hazard, is showing and has promoted on-the-spot safe civilized construction image.
Fig. 2 is a partial sectional view of a foundation pit dewatering structure in an embodiment of the invention; as shown in fig. 2, the wall surface of the foundation pit 1 has a multi-step structure, for example, a three-step structure may be provided, and an inclined surface is formed between two adjacent step surfaces 8; and a first dewatering well 3 is arranged on each step surface 8 and at the bottom of the foundation pit 1.
For example, the inclined surface protection adopts a bidirectional reinforcing steel bar net piece, fine aggregate concrete is sprayed on the surface of the bidirectional reinforcing steel bar net piece, and the bidirectional reinforcing steel bar net piece is fixed by reinforcing steel bars. For example, bagged gravel presser feet can be piled up at the corner positions of the bottom of the foundation pit 1 to prevent the slope collapse.
The foundation pit dewatering structure further comprises a second dewatering well 4 and a second pneumatic dewatering well; the second precipitation well 4 sets up in the bottom of foundation ditch 1, and second precipitation well 4 can have a plurality ofly, and wherein, the position of second precipitation well 4 can set up as required, guarantees that first precipitation well 3 is different with the position of second precipitation well 4, and the degree of depth of first precipitation well 3 is less than the degree of depth of second precipitation well 4. For example, the depth of the first dewatering well 3 may be 20.5m, and the depth of the second dewatering well 4 may be 24 m. The second pneumatic dewatering pump is arranged in the second dewatering well 4 and is suitable for pumping the water body in the second dewatering well 4 to the outside of the foundation pit 1; for example, the second pneumatic precipitation pump and the second precipitation well 4 may be arranged in a one-to-one correspondence. For example, the number of the first dewatering well 3 may be 214, and the number of the second dewatering well 4 may be 14.
Wherein, the first pneumatic water descending pump and the second pneumatic water descending pump can be the same, and the water yield can be 1.4m 3 The delivery lift is 60 m. Power is 55KW, exhaust gas quantity is 20m 3 Min, gas production pressure is 1.5Mpa, voltage is 220V, and each gas distribution box can be connected with 12 branch pipes.
For example, the first dewatering well 3 and the second dewatering well 4 may be sand-free piping wells, which use 400mm cement gravel filter pipes and are wrapped with a plurality of layers of geotextiles, and the diameter of crushed stone of the sand-free piping wells is not less than 700 mm.
Wherein, this foundation ditch precipitation structure still includes relief well 5, sets up in the bottom of foundation ditch 1, and relief well 5's position can set up as required, guarantees different with the position of first precipitation well 3 and second precipitation well 4. For example, the relief well 5 may be provided near the second dewatering well 4, and the relief well 5 may be provided with 6 ports. The relief well 5 may be a steel pipe well and may have a depth of 39 m.
For example, each relief well 5 may have a pore size of 650mm, and a bridge filter may be wrapped with geotextile using a length of steel tubing having a diameter of 273mm and a wall thickness of 4mm, the filter having the same diameter as the casing tubing and protected with bamboo skin. The vertical verticality is not more than 1/200, and the well head is 0.5m higher than the ground and is covered. And (4) combining excavation working conditions according to the principle of 'reducing pressure as required'.
Wherein, this foundation ditch precipitation structure still includes dive observation well 7, sets up the outward flange at foundation ditch 1 along the circumference of foundation ditch 1, is suitable for the submerged water level variation who observes foundation ditch 1 all ring edge border in the work progress.
For example, 28 submersible observation wells 7 can be provided, each submersible observation well has a depth of 17.5m, the well forming requirements of the submersible observation wells 7 can be the same as that of the first dewatering well 3, the well head is 0.5m higher than the ground, and a cover is added to prevent blockage. The device is arranged so as to feed back information and guide construction in time.
Wherein, this foundation ditch precipitation structure still includes confined water observation well 6, sets up the outward flange at foundation ditch 1 along the circumference of foundation ditch 1, is suitable for the water level variation of the confined water of observing foundation ditch 1 surrounding environment in the work progress.
For example, the pressure water observation well 6 can be provided with 11 ports, the depth of each pressure water observation well 6 is 37m, the well formation requirement of the pressure water observation well 6 is the same as that of the relief well 5, the well head is 0.5m higher than the ground, and a cover is added to prevent blockage. The device is arranged so as to feed back information and guide construction in time. For example, the confined water observation well 6 and the submersible observation well 7 may be arranged at a collinear spacing.
The foundation pit dewatering structure further comprises a water retaining platform which is arranged on the outer edge of the foundation pit 1 along the circumferential direction of the foundation pit 1; the submersible observation well 7 is positioned on one side of the water retaining platform close to the foundation pit 1; the diving observation well 7 and the confined water observation well 6 are positioned on one side of the water retaining platform close to the foundation pit 1.
The foundation pit dewatering structure further comprises a water collecting ditch 9, wherein the water collecting ditch is arranged at the bottom of the foundation pit 1 along the circumferential direction of the foundation pit 1 and is suitable for collecting accumulated water at the bottom of the foundation pit 1; the water collecting ditch 9 is communicated with the first precipitation well 3 so that the collected water flows into the first precipitation well. For example, when the foundation pit 1 is excavated to the height of the pit bottom, the blind ditch with equal-particle-size crushed stones is made along the periphery of the foundation pit 1 to be used as the water collecting ditch 9, the blind ditch can be filled along with excavation, the blind ditch with the size of 300mm wide and 400mm deep is formed, and the blind ditch is connected with the first dewatering well 3 and the second dewatering well 4 to form a dewatering and drainage system.
Fig. 3 is a flowchart of a method for lowering water in a foundation pit according to an embodiment of the present invention, and as shown in fig. 3, in another embodiment, a method for lowering water in a foundation pit is provided, which includes the following steps: arranging three-axis stirring piles 2 around the foundation pit 1 to form a closed waterproof curtain around the foundation pit 1; arranging a plurality of first precipitation wells 3 and second precipitation wells 4 in the foundation pit 1, and pumping water bodies in the first precipitation wells 3 and the second precipitation wells 4 to the outside of the foundation pit 1 by adopting a first pneumatic precipitation pump and a second pneumatic precipitation pump; arranging a water collecting ditch 9 at the bottom of the foundation pit 1 to collect accumulated water in the foundation pit 1 and discharging the collected accumulated water into a precipitation well; arranging a water retaining platform at the periphery of the foundation pit 1 to prevent water outside the foundation pit 1 from flowing back into the foundation pit 1; a relief well 5 is arranged at the bottom of the foundation pit 1 to reduce the pressure-bearing water pressure and the osmotic pressure in the foundation pit 1; and a submersible observation well 7 and a confined water observation well 6 are arranged at the periphery of the foundation pit 1 to observe the water level change at the periphery of the foundation pit 1.
The first dewatering well 3 and the second dewatering well 4 are sand-free pipe wells, and the depths of the first dewatering well 3 and the second dewatering well 4 are different; the observation well comprises a submersible observation well 7 and a confined water observation well 6, wherein the submersible observation well 7 adopts a sand-free pipe well, and the depth of the well is smaller than that of the dewatering well; the confined water observation well 6 adopts a steel pipe well, and the depth of the confined water observation well is greater than that of the dewatering well; the relief well 5 is a steel pipe well, and the depth of the relief well is greater than that of the pressure-bearing water observation well 6.
In conclusion, the foundation pit dewatering structure and method in the application utilize comprehensive application of construction methods such as the three-shaft stirring pile 2, the dewatering well, the relief well 5, the observation well, the broken stone blind ditch, the water retaining platform and the like, so that one-layer diving and two-layer bearing water are well controlled, the control problems of high underground water level and three-layer underground water are effectively solved, the phenomena of supporting structure leakage water and instability are not generated, the problems of cracks and settlement do not occur on the ground around the foundation pit 1, dry groove construction is realized, the engineering quality and safe production are ensured, and the engineering cost is saved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A foundation pit dewatering structure is characterized by at least comprising:
a foundation pit;
the triaxial mixing piles are arranged along the circumferential direction of the foundation pit so as to form a closed waterproof curtain around the foundation pit;
the first dewatering well is arranged in the foundation pit;
and the first pneumatic precipitation pump is arranged in the first precipitation well and is suitable for pumping the water body in the first precipitation well to the outside of the foundation pit.
2. A foundation pit precipitation structure according to claim 1,
the wall surface of the foundation pit is of a multi-stage stepped structure, and an inclined surface is arranged between every two adjacent stepped surfaces;
the ladder face with the bottom of foundation ditch all is provided with first precipitation well.
3. A foundation pit precipitation structure according to claim 2,
the system also comprises a second dewatering well and a second pneumatic dewatering well;
the second dewatering well is arranged at the bottom of the foundation pit;
the second pneumatic water descending pump is arranged in the second precipitation well and is suitable for pumping the water body in the second precipitation well to the outside of the foundation pit;
the first dewatering well and the second dewatering well are different in position, and the depth of the first dewatering well is smaller than that of the second dewatering well.
4. A foundation pit precipitation structure according to claim 2,
the foundation pit structure is characterized by further comprising a relief well which is arranged at the bottom of the foundation pit and is different from the first dewatering well in position.
5. A foundation pit precipitation structure according to claim 2,
still include the dive observation well, follow the circumference setting of foundation ditch is in the outward flange of foundation ditch is suitable for the submerged water level variation of the surrounding environment of observation foundation ditch in the work progress.
6. A foundation pit precipitation structure according to claim 2,
the system also comprises a confined water observation well, wherein the confined water observation well is arranged at the outer edge of the foundation pit along the circumferential direction of the foundation pit and is suitable for observing the water level change of confined water in the surrounding environment of the foundation pit in the construction process.
7. A foundation pit precipitation structure according to claim 5 or 6,
the water retaining platform is arranged on the outer edge of the foundation pit along the circumferential direction of the foundation pit;
the submersible observation well is positioned on one side of the water retaining platform close to the foundation pit;
the confined water observation well is positioned on one side of the water retaining platform close to the foundation pit.
8. A foundation pit precipitation structure according to claim 2,
the water collecting ditch is arranged at the bottom of the foundation pit along the circumferential direction of the foundation pit and is suitable for collecting accumulated water at the bottom of the foundation pit;
the water collecting ditch is communicated with the first dewatering well so that collected accumulated water flows into the first dewatering well.
9. A foundation pit dewatering method is characterized by comprising the following steps:
arranging three-axis stirring piles around the foundation pit to form a closed waterproof curtain around the foundation pit;
arranging a plurality of precipitation wells in the foundation pit, and pumping water in the precipitation wells to the outside of the foundation pit by adopting a pneumatic precipitation pump;
arranging a water collecting channel at the bottom of the foundation pit to collect accumulated water in the foundation pit and discharging the collected accumulated water into a precipitation well;
arranging a water retaining platform at the periphery of the foundation pit to prevent water outside the foundation pit from flowing back into the foundation pit;
arranging a relief well at the bottom of the foundation pit to reduce the pressure-bearing water pressure and the osmotic pressure in the foundation pit;
and arranging an observation well at the periphery of the foundation pit to observe the water level change at the periphery of the foundation pit.
10. A method of dewatering a foundation pit according to claim 9,
the dewatering wells are sand-free pipe wells and comprise two different depths;
the observation well comprises a submersible observation well and a confined water observation well, wherein the submersible observation well adopts a sand-free pipe well, and the depth of the sand-free pipe well is smaller than that of the dewatering well; the confined water observation well adopts a steel pipe well, and the depth of the confined water observation well is greater than that of the dewatering well;
the relief well adopts a steel pipe well, and the depth of the relief well is greater than that of the pressure-bearing water observation well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524759.4A CN114837207A (en) | 2022-05-13 | 2022-05-13 | Foundation pit dewatering structure and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524759.4A CN114837207A (en) | 2022-05-13 | 2022-05-13 | Foundation pit dewatering structure and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114837207A true CN114837207A (en) | 2022-08-02 |
Family
ID=82569012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210524759.4A Pending CN114837207A (en) | 2022-05-13 | 2022-05-13 | Foundation pit dewatering structure and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114837207A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH579220A5 (en) * | 1975-02-07 | 1976-08-31 | Bless Bauunternehmung Ag | Motorless pump for reducing ground water level - has housing with valves for water and compressed air pipes |
| JP2016084586A (en) * | 2014-10-23 | 2016-05-19 | 前田建設工業株式会社 | Method for determining appropriate air feeding pressure to caisson work room in pneumatic caisson method |
| CN108867673A (en) * | 2018-06-12 | 2018-11-23 | 武汉丰达地质工程有限公司 | A kind of underwater prevention method in the foundation pit based on the curtain that draws water |
| CN109930613A (en) * | 2019-04-23 | 2019-06-25 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of construction method and structure of the roadbed slope drainage system that seeps water |
| CN213448534U (en) * | 2020-07-29 | 2021-06-15 | 中南勘察设计院集团有限公司 | Sealing and lowering combined pressure-bearing water control system |
| CN113373950A (en) * | 2021-05-20 | 2021-09-10 | 杭州交投建设工程有限公司 | Chemically improved curtain and well point dewatering foundation pit water stop structure and construction method |
| CN214883774U (en) * | 2021-03-24 | 2021-11-26 | 福建路港（集团）有限公司 | Foundation pit dewatering and water stopping device |
| CN114045850A (en) * | 2021-12-02 | 2022-02-15 | 中交第三公路工程局有限公司 | Construction method for replacing waterproof curtain by combination of light well point and pneumatic dewatering |
-
2022
- 2022-05-13 CN CN202210524759.4A patent/CN114837207A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH579220A5 (en) * | 1975-02-07 | 1976-08-31 | Bless Bauunternehmung Ag | Motorless pump for reducing ground water level - has housing with valves for water and compressed air pipes |
| JP2016084586A (en) * | 2014-10-23 | 2016-05-19 | 前田建設工業株式会社 | Method for determining appropriate air feeding pressure to caisson work room in pneumatic caisson method |
| CN108867673A (en) * | 2018-06-12 | 2018-11-23 | 武汉丰达地质工程有限公司 | A kind of underwater prevention method in the foundation pit based on the curtain that draws water |
| CN109930613A (en) * | 2019-04-23 | 2019-06-25 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of construction method and structure of the roadbed slope drainage system that seeps water |
| CN213448534U (en) * | 2020-07-29 | 2021-06-15 | 中南勘察设计院集团有限公司 | Sealing and lowering combined pressure-bearing water control system |
| CN214883774U (en) * | 2021-03-24 | 2021-11-26 | 福建路港（集团）有限公司 | Foundation pit dewatering and water stopping device |
| CN113373950A (en) * | 2021-05-20 | 2021-09-10 | 杭州交投建设工程有限公司 | Chemically improved curtain and well point dewatering foundation pit water stop structure and construction method |
| CN114045850A (en) * | 2021-12-02 | 2022-02-15 | 中交第三公路工程局有限公司 | Construction method for replacing waterproof curtain by combination of light well point and pneumatic dewatering |
Non-Patent Citations (2)
| Title |
|---|
| 江苏宁沪高速公路股份有限公司等: "常用安全生产文书写作规范与实例", 广西人民出版社, pages: 224 - 156 * |
| 钟治亮: "基坑井点气动降水应用技术", pages 122 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107938692B (en) | Drainage and recharging construction method and structure | |
| CN102454167A (en) | Construction method for large ultra-deep well | |
| CN103046565B (en) | Draining method for ultra-deep batholith deep foundation pit | |
| CN110219313B (en) | Drainage system and construction method for underground construction blind well | |
| CN111335344A (en) | Super pressure suction combined well point dewatering construction method for subway deep foundation pit | |
| CN110805022B (en) | Mud solidification treatment device and method for matching electroosmosis well point with well point dewatering | |
| LU500273B1 (en) | New comprehensive dewatering and drainage method and drainage device for mudstone subway station | |
| CN111139852A (en) | Water-rich sandy gravel stratum high-permeability ultra-deep foundation pit dewatering construction method | |
| CN111236284A (en) | Basement bottom and periphery underground water drainage method and structure | |
| CN210737511U (en) | Tower type groundwater pressure recharge equipment | |
| CN111851508A (en) | High-pressure-bearing circular deep foundation pit structure suitable for water-rich sand-gravel layer and construction method thereof | |
| CN213267959U (en) | Foundation pit bottom drainage integrated system completed after underground water level rises | |
| CN114837207A (en) | Foundation pit dewatering structure and method | |
| CN114737589A (en) | Foundation pit shallow layer drainage method | |
| CN114855822A (en) | Construction method for deep foundation pit of rain sewage pipeline on highway | |
| CN113914342A (en) | Basement outer wall fertilizer groove drainage construction method | |
| CN114293578A (en) | Basement drainage and water level monitoring system and construction method thereof | |
| CN113089702A (en) | Pump station foundation pit integrated drainage system and construction method | |
| CN112695779A (en) | High-rise building foundation pit construction method for local precipitation of elevator shaft foundation pit | |
| CN219826919U (en) | Permanent-temporary-combination sewage discharge precipitation structure in water-rich mountain tunnel excavation construction | |
| CN219710364U (en) | Pit-in-pit dewatering system in foundation pit | |
| CN215367355U (en) | Foundation pit water draining system | |
| CN216552030U (en) | Basement outer wall fat groove falls drainage structures | |
| CN212052829U (en) | Basement bottom and groundwater all around draw row structure | |
| CN217782107U (en) | Water-rich region groundwater falls arranges and recycle device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |