CN112609722A - Drainage and water leakage plugging method for deep foundation pit in sea reclamation area - Google Patents
Drainage and water leakage plugging method for deep foundation pit in sea reclamation area Download PDFInfo
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- CN112609722A CN112609722A CN202011435761.1A CN202011435761A CN112609722A CN 112609722 A CN112609722 A CN 112609722A CN 202011435761 A CN202011435761 A CN 202011435761A CN 112609722 A CN112609722 A CN 112609722A
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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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- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a method for lowering water drainage and plugging water leakage of a deep foundation pit in a sea-filling area, which mainly comprises the following steps: the method comprises the following steps of measuring and setting line, punching, installing a well point pipe, filling sand, paving a main pipe, entering a field by using pumping equipment, communicating the well point pipe with the main pipe, pumping water, and finally performing water leakage treatment.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a method for lowering and draining water and plugging water leakage of a deep foundation pit in a sea reclamation area.
Background
When the deep foundation pit excavation is carried out on the silt geology of the sea-filling area in the aquifer with a higher underground water level, the water level difference between the inside and the outside of the pit is large, so that the damage phenomena such as sand flowing, piping and the like are easily generated, and even the side slope or the pit wall is unstably collapsed, therefore, before the foundation pit excavation, a precipitation process is needed to reduce the water level inside and outside the foundation pit, and the aim of excavating the foundation pit is fulfilled.
The pipe well precipitation is a common foundation pit precipitation construction method, in the construction site of the sea reclamation area, the original design is 36 pipe well precipitation wells with the depth of 20m, and because the pipe well precipitation is not suitable for precipitation of silt geology of the sea reclamation area, the precipitation effect is poor, and the condition of water leakage is easy to occur, an optimized foundation pit precipitation scheme is needed.
Disclosure of Invention
The invention mainly aims to provide a method for draining water and plugging water leakage of a deep foundation pit in a sea reclamation area, aiming at improving the draining effect in the foundation pit in the sea reclamation area and preventing water leakage.
In order to achieve the purpose, the invention provides a method for lowering water drainage and plugging water leakage of a deep foundation pit in a sea reclamation area, which comprises the following steps:
and (3) measurement and paying-off: determining the position of a well point according to a design drawing, wherein the well point is arranged on the inner side of a waterproof curtain around a foundation pit;
punching: punching a hole at the well point by using an impact type or rotary type drilling machine, wherein the hole is deeper than the well point;
installing a well point pipe: hoisting a well point pipe by using a frame and inserting the well point pipe into the center of a well hole, wherein the upper end of the well point pipe is plugged by using a wooden plug;
filling sand: filling a sand and stone filter layer between the well point pipe and the wall of the well hole;
laying a main pipe: the main pipe is arranged at the position 40-60 cm outside the well pipe, a groove is dug before the main pipe is laid, and the main pipes are placed into the groove one by one;
entering a water pumping device: a vacuum pump is arranged according to 40m, the lift of the centrifugal pump is 60m, and the flow rate is 45m3/h；
The well point pipe is communicated with the main pipe: connecting the well point pipe with the main pipe by using a water absorption rubber pipe, and communicating the well point pipe with the pumping equipment;
water pumping: firstly, starting a vacuum pump to exhaust gas, and then starting a centrifugal pump to pump water, so as to ensure continuous pumping until the water level at a well point is reduced to a designed depth;
and (3) water leakage treatment: drainage is performed by adopting a drainage tube or chemical slurry is injected for plugging.
Optionally, the step of measuring the line laying further comprises arranging 2 water level observation holes in the foundation pit.
Optionally, the punching is completed and then the hole washing is further included: and pumping out the slurry in the well hole by using an air compressor or a water pump.
Optionally, the sand is coarse sand, and the thickness of the sand filtering layer is 60-100 mm.
Optionally, after sand filling is carried out at a well point, sealing and compacting 1-1.5 m below the well mouth by using clay.
Optionally, before pumping, the method further comprises the steps of debugging to pump water, checking whether the operation of the water pumping equipment is normal, and checking whether the pipeline has an air leakage phenomenon.
Optionally, the drainage tube drain specifically comprises: and inserting a drainage tube at a water seepage point of the foundation pit, plugging the periphery of the drainage tube by using quick-setting waterproof cement mortar, and knotting the drainage tube after the cement mortar reaches the strength.
Optionally, after pumping water, the well point water level is reduced to 0.5-1 m below the bottom surface of the foundation pit.
Optionally, the chemical slurry comprises a solution A and a solution B, wherein the solution A is water: cement: bentonite: external admixture is 0.7: 1: 0.03: 0.03, wherein the solution B is a sodium silicate solution, and the ratio of the solution A in the chemical slurry is as follows: and (4) 1:14 of the solution B.
Optionally, the grouting pressure for injecting the chemical grout is 0.3-0.8Mpa, the grouting flow is 25-35l/min, and the grouting amount is 0.375m 3/m.
According to the technical scheme, the light well point dewatering process is adopted to carry out dewatering and drainage on the foundation pit in the sea-fill area, so that the water level of the foundation pit is reduced to the designed depth, the interior of the foundation pit is kept dry, the foundation pit is convenient to excavate, then the drainage pipe drainage or chemical slurry injection plugging method is adopted to treat the water seepage position in the foundation pit, the dry environment in the foundation pit is further kept, and the excavation of the foundation pit is prevented from being influenced.
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 method for water drainage and water leakage plugging of a deep foundation pit in a sea reclamation area according to the invention.
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.
The invention provides a method for lowering and draining water and plugging water leakage of a deep foundation pit in a sea reclamation area, which can effectively lower the underground water level in the deep foundation pit in the sea reclamation area and can effectively prevent the occurrence of leakage.
In an embodiment of the present invention, referring to fig. 1, a method for drainage and water leakage plugging of a deep foundation pit in a sea reclamation area is provided, which includes the following steps:
and (3) measurement and paying-off: and determining the position of a well point according to a design drawing, wherein the well point is arranged on the inner side of the waterproof curtain around the foundation pit.
Specifically, the construction site of the embodiment of the invention is positioned in a sea-filling area and mainly takes soil layers with small permeability coefficients such as silt, mucky soil, silt and the like as main materials, so that a light well-point dewatering construction process is suitable for being selected, and a pipe well dewatering construction process suitable for soil layers with large permeability coefficients is not suitable for being adopted.
Specifically, the light well point dewatering is buried well point pipes in the periphery of the foundation pit and extends into the water-containing layer, the upper ends of the well point pipes are connected with the main pipe through the connecting bent pipe, the main pipe is connected with the pumping equipment, and the pumping equipment is started to pump underground water out, so that the underground water is lowered below the bottom of the foundation pit.
Specifically, the area of the foundation pit is large, so that the annular well point arrangement is adopted, and the drainage performance is improved. And (4) laying and constructing the main pipe and the well point pipe of the light well point dewatering along the inner sides of the cement mixing piles around the basement foundation pit. The supporting structure with the water retaining function is preferentially adopted, the dewatering well point pipe is buried at the inner side of the supporting wall as far as possible, and the depth of the well point pipe is shallower than that of the supporting wall. In order to observe the water level falling condition in the foundation pit at any time, 2 water level observation holes with the aperture of 1.25' steel pipes can be preferably arranged in the foundation pit.
Specifically, according to the geological condition and the light well point dewatering experience of the embodiment of the invention, the distance between the well point pipes of the basement foundation pit is 2.0m, and the length of the main pipe is about 420 m.
Preferably, in order to ensure that water at the top of the foundation pit does not flow into the foundation pit, a 300 x 400mm brick-built annular communicated open drainage ditch is arranged at the position 1m away from a top slope line or at the edge of a fence on each side of a construction site. And (3) finding slopes of the drainage open ditches around the foundation pit according to 0.2%, building a sedimentation tank at the side of the drainage open ditches, and setting a water collecting well about every 25m, wherein the specification of the sedimentation tank is 1200 multiplied by 1500. Before the underground water enters the urban pipe network, a 2820 multiplied by 1680 multiplied by 1200 tertiary sedimentation tank and a water quality detection well with the diameter of 1 meter are arranged. The water outside the foundation pit is naturally discharged into a municipal drainage system through a sedimentation tank or a water pump, and the environmental pollution is avoided.
Punching: a hole is punched at the well point with a percussion or rotary drill, the hole being deeper than the well point design.
Specifically, the pore-forming equipment can be a long spiral drilling machine, a winch, a flushing pipe, a high-pressure water pump, a sleeve or a high-pressure water gun and the like. The well bore is deeper than the well point design to ensure that a filter bed can be placed at the bottom of the well bore. Specifically, still including washing the hole after punching the hole: and pumping out the slurry in the well hole by using an air compressor or a water pump, so that a well point pipe can be conveniently installed subsequently.
Installing a well point pipe: the well point pipe is lifted by a frame and inserted into the center of the well hole, and the upper end of the well point pipe is plugged by a wooden plug.
Specifically, after the well point pipe is inserted into a well hole, the well point pipe is enabled to exceed the ground by 20-40 mm, and the well point pipe is convenient to connect with a main pipe. The upper end of the well point pipe is plugged by a wooden plug, so that soil or sand can be prevented from entering the well point pipe.
Filling sand: and filling a sand filtering layer between the well point pipe and the wall of the well hole.
In particular, fine sand cannot be used, and coarse sand must be used to prevent clogging of the screen. The thickness of the sandstone filtration layer is 60-100 mm. The sand filter layer is filled to a height of at least 1800mm above the top of the filter tube and is generally filled to a position above the underwater level. Specifically, after sand is filled at a well point, clay is used for sealing and compacting 1-1.5 m below a well mouth, so that air leakage is prevented, and the precipitation effect is reduced.
Laying a main pipe: the main pipe is arranged at the position 40-60 cm outside the well pipe, the grooves are dug before the main pipe is laid, and the main pipe is placed into the grooves one by one.
Specifically, before the main pipe is laid, a groove is dug, the bottom of the groove is leveled, the prepared main pipes are placed into the groove one by one, bolts penetrate through end flanges, rubber sealing rings are arranged on the end flanges, then the flange bolts are screwed, and the end portions of the main pipes are firmly sealed through flanges.
Entering a water pumping device: a vacuum pump is arranged according to 40m, the lift of the centrifugal pump is 60m, and the flow rate is 45m3/h。
Specifically, pumping equipment is arranged according to construction requirements, a vacuum pump is used for vacuumizing, and a centrifugal pump is used for pumping water.
The well point pipe is communicated with the main pipe: the well point pipe is connected with the main pipe by a water suction rubber pipe and is communicated with the pumping equipment.
Specifically, after the well point pipe and the main pipe are installed, the well point pipe is communicated with the main pipe through a water absorption rubber pipe and is firmly bound through iron wires. After the group of well point pipe parts are connected, the well point pipe parts are communicated with the pumping equipment, and the power supply is switched on, so that the water pumping can be debugged, whether the pumping equipment operates normally or not is checked, whether the pipeline has an air leakage phenomenon or not is checked, and the well point pipe parts are used after being overhauled if the abnormal phenomenon exists.
Water pumping: the vacuum pump is started to exhaust gas, then the centrifugal pump is started to pump water, and continuous water pumping is guaranteed until the water level of the well point is reduced to the designed depth.
Specifically, the pumping volume or the vacuum degree of the centrifugal pump is properly controlled, and when the foundation pit is excavated, well point dewatering is operated by the maximum pumping volume or the vacuum degree. After the cushion layer, the pile cap and the basement bottom plate are finished, the water pumping amount or the vacuum degree can be properly adjusted to be small, so that the precipitation curved surface outside the foundation pit is controlled in a smaller range as far as possible, and water level observation wells are arranged inside and outside the pit to control the water level in time.
Specifically, when the underground water level is excessively reduced and the influence on the surrounding environment is possibly analyzed, a recharging well point can be arranged between the well point and a building, a pipeline and a road surface, recharging is continuously carried out by using water, the underground water at the position is supplemented, the influence radius of the well point precipitation does not exceed the range of the recharging well point, the underground water of the building outside the recharging well point is prevented from losing, and the underground water is kept basically unchanged.
Specifically, the filter pipe part of the recharging well point can be from the position 0.5m above the ground water level to the bottom of the well pipe, and the structure of the recharging well point pipe can be the same as that of the recharging well point pipe, but the quality of hole forming and sand recharging needs to be guaranteed. The distance between the recharging well points is kept to be not less than 6m, so that the two inlets of precipitation and recharging are prevented from being communicated, and the starting and stopping are synchronous. The embedding depth of the recharge well point is determined according to the depth of the permeable layer, so that the construction safety and the recharge effect of the foundation pit are ensured. A certain number of settlement observation points and water level observation wells are arranged near the water falling and irrigation area, and the water falling and irrigation amount is timely adjusted through regular observation and recording so as to keep the water curtain effect.
And (3) water leakage treatment: drainage is performed by adopting a drainage tube or chemical slurry is injected for plugging.
Specifically, in the whole foundation pit excavation stage, in order to prevent the influence of water leakage on the foundation pit excavation, the foundation pit excavation condition is closely watched, and once a water leakage point is found on the wall body, the blocking is timely carried out.
Specifically, the drainage method by adopting the drainage tube comprises the following steps: and inserting a drainage tube at a water seepage point of the foundation pit, plugging the periphery of the drainage tube by using quick-setting waterproof cement mortar, and knotting the drainage tube after the cement mortar reaches the strength.
Specifically, the chemical slurry comprises a liquid A and a liquid B, wherein the liquid A is water: cement: bentonite: external admixture is 0.7: 1: 0.03: 0.03, the cement is selected from ordinary portland cement with the grade of 32.5, the liquid B is sodium silicate solution, and the liquid A in the chemical slurry is as follows: solution B is 1: 14.
specifically, the flow and pressure should be controlled as much as possible during grouting to prevent slurry loss and grouting pressure of 0.3-0.8MPa, grouting flow of 25-35l/min, and grouting amount of 0.375m3Per meter.
According to the technical scheme, the light well point dewatering process is adopted to carry out dewatering and drainage on the foundation pit in the sea-fill area, so that the water level of the foundation pit is reduced to the designed depth, the interior of the foundation pit is kept dry, the foundation pit is convenient to excavate, then the drainage pipe drainage or chemical slurry injection plugging method is adopted to treat the water seepage position in the foundation pit, the dry environment in the foundation pit is further kept, and the excavation of the foundation pit is prevented from being influenced.
The above description is only an alternative 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 method for draining water and plugging water leakage of deep foundation pits in sea reclamation areas is characterized by comprising the following steps:
and (3) measurement and paying-off: determining the position of a well point according to a design drawing, wherein the well point is arranged on the inner side of a waterproof curtain around a foundation pit;
punching: punching a hole at the well point by using an impact type or rotary type drilling machine, wherein the hole is deeper than the well point;
installing a well point pipe: hoisting a well point pipe by using a frame and inserting the well point pipe into the center of a well hole, wherein the upper end of the well point pipe is plugged by using a wooden plug;
filling sand: filling a sand and stone filter layer between the well point pipe and the wall of the well hole;
laying a main pipe: the main pipe is arranged at the position 40-60 cm outside the well pipe, a groove is dug before the main pipe is laid, and the main pipes are placed into the groove one by one;
entering a water pumping device: a vacuum pump is arranged according to 40m, the lift of the centrifugal pump is 60m, and the flow rate is 45m3/h；
The well point pipe is communicated with the main pipe: connecting the well point pipe with the main pipe by using a water absorption rubber pipe, and communicating the well point pipe with the pumping equipment;
water pumping: firstly, starting a vacuum pump to exhaust gas, and then starting a centrifugal pump to pump water, so as to ensure continuous pumping until the water level at a well point is reduced to a designed depth;
and (3) water leakage treatment: drainage is performed by adopting a drainage tube or chemical slurry is injected for plugging.
2. The method for draining water and plugging water leakage of the deep foundation pit in the sea-filling area according to claim 1, wherein the step of measuring and setting out further comprises arranging 2 water level observation holes in the foundation pit.
3. The method for draining water and plugging water leakage of the deep foundation pit in the sea-filling area according to claim 1, wherein the step of hole washing is further carried out after the step of hole punching: and pumping out the slurry in the well hole by using an air compressor or a water pump.
4. The method for water drainage and water leakage plugging of the deep foundation pit in the sea-filling area according to claim 1, wherein the sand is coarse sand, and the thickness of the sand filter layer is 60-100 mm.
5. The method for water drainage and water leakage plugging of the deep foundation pit in the sea-filling area according to claim 4, wherein after sand filling at a well point, sealing and compacting 1-1.5 m below the well mouth by clay.
6. The method for water drainage and water leakage plugging of the deep foundation pit in the reclamation area as recited in claim 1, further comprising the steps of debugging water pumping before water pumping, checking whether the water pumping equipment operates normally, and checking whether the pipeline has air leakage.
7. The method for water drainage and water leakage plugging of the deep foundation pit in the sea reclamation area as recited in claim 1, wherein the well points are provided with recharging well points with buildings, pipelines and pavement pieces, and recharging is continuously performed by using water.
8. The method for draining and plugging water leakage of the deep foundation pit of the sea reclamation area according to claim 1, wherein the drainage of the drainage pipe specifically comprises the following steps: and inserting a drainage tube at a water seepage point of the foundation pit, plugging the periphery of the drainage tube by using quick-setting waterproof cement mortar, and knotting the drainage tube after the cement mortar reaches the strength.
9. The method for draining water and plugging water leakage of deep foundation pits in sea reclamation areas as recited in claim 1, wherein the chemical slurry comprises a solution A and a solution B, wherein the solution A is water: cement: bentonite: external admixture is 0.7: 1: 0.03: 0.03, wherein the solution B is a sodium silicate solution, and the ratio of the solution A in the chemical slurry is as follows: solution B is 1: 14.
10. the method for water drainage and water leakage plugging of the deep foundation pit in the sea-filling area according to claim 9, wherein the grouting pressure for injecting the chemical grout is 0.3-0.8Mpa, the grouting flow is 25-35l/min, and the grouting amount is 0.375m3Per meter.
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| CN202011435761.1A CN112609722A (en) | 2020-12-09 | 2020-12-09 | Drainage and water leakage plugging method for deep foundation pit in sea reclamation area |
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| CN202011435761.1A CN112609722A (en) | 2020-12-09 | 2020-12-09 | Drainage and water leakage plugging method for deep foundation pit in sea reclamation area |
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