CN104018511A - Construction process of underground construction drainage anti-floating device - Google Patents

Construction process of underground construction drainage anti-floating device Download PDF

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Publication number
CN104018511A
CN104018511A CN201410115694.3A CN201410115694A CN104018511A CN 104018511 A CN104018511 A CN 104018511A CN 201410115694 A CN201410115694 A CN 201410115694A CN 104018511 A CN104018511 A CN 104018511A
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China
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pvc
drainage
switch valve
filtration beds
water
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CN201410115694.3A
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CN104018511B (en
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陈硕
陈七林
黄卫忠
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Fuzhou planning and Design Institute Group Co.,Ltd.
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Fuzhou Planning Design and Research Institute
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Abstract

The invention relates to a construction process of an underground construction drainage anti-floating device. According to the construction process, necessary soil conservation capacity, water permeability and anti-blocking performance of drainage and decompression measures can be well guaranteed. The drainage mode achieved through a draining well is adopted, filtering layers in the draining well are vertically arranged, by means of the gravity of the filtering layers, the position of a void is accurately positioned within the well head range of the draining well, and accordingly the backfill processing of the void is feasible. The deposit rate of sand in a settling pond is checked regularly, the void situation in the well head range of the draining well is mastered, and a PVC sand filling pipe can be started at any time so that the sand backfill processing can be carried out in the void range. The flow of drained water in the PVC drainage filter pipe is checked regularly, the probability that the filtering layers of the draining well are blocked is judged, pressure water is injected into the draining well through the PVC drainage filter pipe, the filtering layers are washed in the reverse flowing direction, and accordingly the sand in water filter channels of the filtering layers can be washed out, and the filtering layers of the draining well can be effective for a long time.

Description

A kind of construction technology of underground construction drainage and anti-float device
Technical field
The construction technology that the present invention relates to a kind of underground construction drainage and anti-float device, belongs to underground engineering field.
Background technology
The structure anti-floating problem of underground construction generally adopts stress balance measure to solve, but tends to occur the situation that base arrangement ftractures, percolating water appears in base plate.Its main cause is: base arrangement bears subgrade reaction and effect of water pressure for a long time, and base plate waterproof construction, once the problem such as occur cracking, waterproofing materials is aging, percolating water will occur.
Compared with stress balance measure, drainage pressure-reducing measure can be got rid of the underground water below base arrangement, to reduce or to eliminate the pressure that base arrangement is born.On the one hand, drainage pressure-reducing can reduce or eliminate buoyancy force of underground water effect, is used for the pressure of balance buoyancy just can to reduce or eliminate, and the subgrade reaction acting on base plate has just reduced; On the other hand, drainage pressure-reducing can directly reduce or eliminate the water pressure acting on base plate, even if waterproof quality problem appears in base plate waterproof construction, underground water also can weaken through the ability of base plate waterproof construction, and the possibility that percolating water occurs can be smaller.Therefore, drainage pressure-reducing measure can prevent underground construction generation percolating water situation.
Drainage pressure-reducing measure generally need to arrange filtration beds.In the process of drainage pressure-reducing, the sand grains that particle diameter is larger can be filtered a layer structure and remain; Particle diameter can be along with current run off by the drainage passage of filtering layer structure compared with little sand grains, and sand running-down can cause ground " to be emptied ", and the particular location of " emptying " is difficult to determine, its threat to engineering safety is large; For the moderate sand grains of particle size, may rest in the drainage passage of filtering layer structure, form " obstruction " blocked its water permeability variation that causes of filtering layer structure, along with continuing to increase of chocking-up degree, finally can cause the inefficacy of drainage pressure-reducing measure.Therefore, the filtering layer structure of drainage pressure-reducing measure must have good soil conservation, water permeability and anti-blocking property, interrelated between three, interact, and must find an engineering proposal of can three taking into account.
Summary of the invention
The present invention is directed to above-mentioned technical problem makes improvements, it is the construction technology that the technical problem to be solved in the present invention is to provide a kind of underground construction drainage and anti-float device, in meeting water permeability requirement, also can prevent that " emptying " from appearring in ground, and ensure that drainage passage can keep unimpeded long-term effectively.
The invention is characterized in: a kind of construction technology of underground construction drainage and anti-float device, it is characterized in that, carry out as follows:
(1) construction well head, excavation pit, to well mouth of drainage well elevation place, applies concrete cushion and catch pit fore shaft circle reinforced concrete structure;
(2) behind rig location, hole, after pore-forming, carry out hole clearly, and filtration beds at the bottom of backfill hole;
(3) in hole, lift non-fine concrete chimney filter, and between hole wall and non-fine concrete chimney filter backfill filtration beds;
(4) in non-fine concrete chimney filter, inject water flushing, until after well water change clearly, filtration beds at the bottom of backfill non-fine concrete chimney filter pipe;
(5) in non-fine concrete chimney filter, lift PVC drainage pipe, and between non-fine concrete chimney filter and PVC drainage pipe backfill filtration beds;
(6) extract non-fine concrete chimney filter, and to backfill filtration beds between PVC drainage pipe and the borehole wall, filtration beds end face need flush with catch pit fore shaft circle reinforced concrete structure end face;
(7) lay waterproof layer structure under base plate of foundation pit, fill with behind sandpipe location construction foundation pit reinforced concrete floor at PVC;
(8) behind sedimentation basin overfall gap, sedimentation basin gutter location, the compartment wall between construction sedimentation basin and collecting-tank;
(9) PVC drainage pipe, collecting-tank drinking-water pipe and PVC are installed and fill with sandpipe, thereby form drainage and anti-float device;
(10) drainage and anti-float device is started to debugging, after having debugged, enter normal work.
In step (1) to (9) step, according to groundwater level situation, can be aided with dewatering measure, groundwater level is down to below well head elevation; In step (2), according to different geological conditions, in pore forming process, can adopt mud off, must be by empty quarrel at the bottom of the cleaning hole of clear hole after pore-forming.
In step (2), (3), filtration beds must adopt particle diameter 2 ~ 5mm medium coarse sand, and filtration beds thickness is not less than 30cm; In step (6), backfill filtration beds must be closely knit, and filtration beds must adopt particle diameter 2 ~ 5mm medium coarse sand; In step (4), (5), filtration beds must adopt particle diameter 5 ~ 10mm cobble, and filtration beds thickness is not less than 30cm.
In step (4), by injecting clear water in the filtration beds between hole wall and non-fine concrete chimney filter, and the muddy water in non-fine concrete chimney filter is extracted out, until well water becomes clear water.
In step (5), PVC drainage pipe need be positioned at catch pit axis place; In the scope from the drainage pipe of 1m to PVC below well mouth of drainage well bottom, on PVC drainage pipe tube wall, drain hole is set, establishing the pipe exterior palpi parcel nonwoven of hole scope, the PVC drainage pipe bottom mouth of pipe must adopt nonwoven shutoff.
In step (7), PVC drainage pipe and PVC fill with sandpipe need penetrate the waterproof layer structure under base plate of foundation pit, to guarantee that catch pit and PVC drainage pipe or PVC fill with the draining between sandpipe or fill with the unimpeded of sand passage, PVC drainage pipe or PVC fill with sandpipe and waterproof layer structure it, that PVC drainage pipe or PVC fill with between sandpipe and concrete bottom plated construction palpus waterproof is firm.
In step (8), (10), sedimentation basin gutter carries switch valve, in the time that needs drain sedimentation basin and catchment, can manually opened switch valve, and carry out draining.
In step (9), (10), in PVC drainage pipe, be provided with the high-order gutter that a main drainpipe that carries switch valve and pressure valve, low level gutter that carries switch valve, carry switch valve, when normal work, the switch valve of main drainpipe is in opening, and the switch valve of low level gutter and high-order gutter is in closed condition; When needs are down to groundwater pressure when minimum, can manually opened low level gutter switch valve, carry out free-draining;
In step (9), (10), the control water pressure that in PVC drainage pipe, the hydraulic pressure of main drainpipe pressure valve setting value need require according to foundation ditch anti-floating is definite, and in the time that underground water hydraulic pressure is greater than setting value, pressure valve is opened automatically, and main drainpipe starts draining; In the time that hydraulic pressure is less than setting value, pressure valve is closed automatically, and main drainpipe stops draining;
In step (9), (10), collecting-tank drinking-water pipe is with water pump and Circuits System, the switch control of water pump comprises automatically and manual two kinds of modes, usually while work, switch control is in auto state, water pump can open and close automatically draining according to collecting-tank water level situation, in the time that needs drain collecting-tank and catchment, need first switch control to be switched to manual mode from auto state, can adopt manual control to carry out opening and closing draining, when manual off switch, switch control automatically switches to auto state.
In step (9), (10), PVC fills with sandpipe two and carry switch valve, in the process of device drainage pressure-reducing, tiny silt particle in ground may be followed flowing water through filtration beds, and flow into sedimentation basin through PVC drainage pipe, formation silt particle runs off, and its consequence may cause the soil body loose near the catch pit borehole wall or shaft bottom, further may form cavity, device adopts catch pit drainage pattern, filtration beds in catch pit adopts and is arranged vertically, under Action of Gravity Field, sand grains in filtration beds can form pressure at right angle and lateral pressure, and the soil body of Around A Borehole is formed to support action, the tiny silt particle that this support action can hinder in the soil body on the one hand runs off with flowing water, on the other hand, in the time having there is silt particle loss, sand grains in filtration beds can carry out densification or filling to the loose earth of Around A Borehole in time, can stop tiny silt particle to occur further to run off, its form of expression is that sedimentation can occur the filtration beds of well mouth of drainage well part, between filtration beds and well head place base plate of foundation pit, can there is " coming to nothing ", in addition, in sedimentation basin, also can find that there is too much mud and sand silting, make regular check on the drain discharge of PVC drainage pipe, in the time that drain discharge diminishes, analyze and get rid of beyond other influences factor, having a reason is exactly that trap drainage layer may stop up, now, can carry out backwash to injection pressure water in catch pit, its work flow is: first, open a PVC and fill with sandpipe switch valve, close the main drainpipe switch valve of PVC drainage pipe, then, open the high-order gutter switch valve of PVC drainage pipe, and to Pressure Casting clear water in high-order gutter, filtration beds is carried out to back flush, to the silt particle being blocked in filtration beds drainage passage is developed, after dredging drainage passage, stop pressure injection clear water, finally, open after the main drainpipe switch valve of PVC drainage pipe, the high-order gutter and the PVC that close PVC drainage pipe fill with sandpipe switch valve, make regular check on silt particle situation in sedimentation basin, in the time that in sedimentation basin, mud and sand silting is more, in catch pit, between filtration beds and well head place base plate of foundation pit, may there is " coming to nothing ", need in catch pit, fill with sand, to fill in time " coming to nothing " space being produced because of filtration beds sedimentation, specifically its work flow is:
The 1st step, manually opened collecting-tank drinking-water pipe switch valve carries out draining, catchments to get rid of collecting-tank;
The 2nd step, opens sedimentation basin gutter switch valve, gets rid of sedimentation basin and catchments;
The 3rd step, the low level gutter switch valve of unlatching PVC drainage pipe, carries out free-draining, and cuts out the main drainpipe switch valve of PVC drainage pipe;
The 4th step, opens two PVC and fills with sandpipe switch valve, and a PVC fills with the medium coarse sand sand aqueous mixtures of perfusion particle diameter 2 ~ 5mm in sandpipe wherein, and closes the low level gutter switch valve of PVC drainage pipe;
The 5th step, in the time that another root PVC filling sandpipe has sand aqueous mixtures to overflow, stops filling with sand, and opens the low level gutter switch valve of PVC drainage pipe;
The 6th step, opens after the main drainpipe switch valve of PVC drainage pipe, closes the low level gutter switch valve of two PVC fillings sandpipe, sedimentation basin gutter and PVC drainage pipes;
The 7th step, manual-lock collecting-tank drinking-water pipe switch valve, makes the control of collecting-tank drinking-water pipe switch in auto state.
In step (1), in (10), multiple catch pits can connect into a drainage and anti-float system by gutter, and each catch pit can have sedimentation basin alone, and multiple catch pits can share a collecting-tank.
Advantage of the present invention: the present invention adopts catch pit drainage pattern, filtration beds in catch pit adopts and is arranged vertically, utilize the Action of Gravity Field of filtration beds, the uncertain ground in position that draining is caused " is emptied " problem and is converted into " coming to nothing " problem between filtration beds and the base plate of foundation pit within the scope of well mouth of drainage well, the position of " coming to nothing " is accurately positioned in well mouth of drainage well scope, makes the backfill of " coming to nothing " be treated as feasible;
The present invention can, by making regular check on the mud and sand silting amount in sedimentation basin, grasp " coming to nothing " situation within the scope of well mouth of drainage well, and can open at any time PVC filling sandpipe " coming to nothing " scope is filled with to sand backfill processing;
The present invention can make regular check on the drain discharge of PVC drainage pipe, judge that the possibility of stopping up occurs catch pit filtration beds, can utilize PVC drainage pipe to injection pressure water in catch pit, filtration beds is carried out to the flushing of reverse direction flow, the silt particle being blocked in filtration beds drainage passage is developed, can guarantee that catch pit filtration beds is permanently effective.
Brief description of the drawings
Fig. 1 is example of the present invention: a kind of underground construction drainage and anti-float device catch pit sectional drawing.
Fig. 2 is example of the present invention: a kind of underground construction drainage and anti-float device catch pit fore shaft circle plan view.
Fig. 3 is example of the present invention: a kind of underground construction drainage and anti-float device sectional drawing.
Fig. 4 is example of the present invention: a kind of underground construction drainage and anti-float setting plane.
In figure: 1-foundation ditch above-ground route, 2-concrete cushion, 3-catch pit fore shaft circle reinforced concrete structure, the 4-catch pit borehole wall, 5-non-fine concrete chimney filter, 6-particle diameter 2 ~ 5mm medium coarse sand filtration beds, 7-PVC drainage pipe, 8-particle diameter 5 ~ 10mm cobble filtration beds, 9-filtration beds interface, waterproofing course under 10-base plate of foundation pit, 11-foundation pit reinforced concrete base plate, 12-sedimentation basin, 13-collecting-tank, 14-collecting-tank drinking-water pipe, 15-PVC fills with sandpipe, 16-manhole, 17-cover plate, 18-pressure valve, 19-switch valve, 20-main drainpipe, 21-base plate of foundation pit end face line, 22-sedimentation basin gutter, 23-low level gutter, 24-compartment wall, 25-overfall gap.
Detailed description of the invention
Referring to figs. 1 to Fig. 4, the present invention relates to a kind of construction technology of underground construction drainage and anti-float device, comprise following structure and step:
(1) construction well head, excavation pit, to well mouth of drainage well elevation place 1, applies concrete cushion 2 and catch pit fore shaft circle reinforced concrete structure 3;
(2) behind rig location, hole 4, after pore-forming, carry out hole clearly, and filtration beds 6 at the bottom of backfill hole;
(3) in hole, lift non-fine concrete chimney filter 5, and between hole wall 4 and non-fine concrete chimney filter 5 backfill filtration beds 6;
(4) to the interior injection water flushing of non-fine concrete chimney filter 5, until after well water change clearly, backfill non-fine concrete chimney filter 5 is managed end filtration beds 8;
(5) at the interior lifting of non-fine concrete chimney filter 5 PVC drainage pipe 7, and between non-fine concrete chimney filter 5 and PVC drainage pipe 7 backfill filtration beds 8;
(6) extract non-fine concrete chimney filter 5, and to backfill filtration beds 6 between PVC drainage pipe 7 and the borehole wall 4, filtration beds 6 end faces need flush with catch pit fore shaft circle reinforced concrete structure 3 end faces;
(7) lay waterproofing course 10 structures under base plate of foundation pit, fill with behind sandpipe 15 location construction foundation pit reinforced concrete floor 11 at PVC;
(8) behind sedimentation basin overfall gap 25, sedimentation basin gutter 22 location, the compartment wall 24 between construction sedimentation basin 12 and collecting-tank 13;
(9) PVC drainage pipe 7, collecting-tank drinking-water pipe 14 and PVC are installed and fill with sandpipe 15;
(10) drainage and anti-float device starts debugging, enters normal work after having debugged.
Further, in step (1) to (9) step, according to groundwater level situation, can be aided with dewatering measure, groundwater level is down to below well head elevation.
Further, in step (2), according to different geological conditions, in pore forming process, can adopt mud off, must be by empty quarrel at the bottom of the cleaning hole of clear hole after pore-forming.
Further, in step (2), (3), filtration beds 6 must adopt particle diameter 2 ~ 5mm medium coarse sand, and filtration beds 6 thickness are not less than 30cm.
Further, in step (4), by injecting clear water in the filtration beds 6 between hole wall 4 and non-fine concrete chimney filter 5, and the muddy water in non-fine concrete chimney filter 5 is extracted out, until well water becomes clear water.
Further, in step (4), (5), filtration beds 8 must adopt particle diameter 5 ~ 10mm cobble, and filtration beds 8 thickness are not less than 30cm.
Further, in step (5), PVC drainage pipe 7 need be positioned at catch pit axis place; In the scope from the drainage pipe of 1m to PVC below well mouth of drainage well 7 bottoms, on PVC drainage pipe 7 tube walls, drain hole is set, establishing the pipe exterior palpi parcel nonwoven of hole scope, the PVC drainage pipe 7 bottom mouths of pipe must adopt nonwoven shutoff.
Further, in step (6), backfill filtration beds 6 must be closely knit, and filtration beds 6 must adopt particle diameter 2 ~ 5mm medium coarse sand.
Further, in step (7), PVC drainage pipe 7 and PVC fill with sandpipe 15 need penetrate waterproofing course 10 structures under base plate of foundation pit, to guarantee that catch pit and PVC drainage pipe 7 or PVC fill with the draining between sandpipe 15 or fill with the unimpeded of sand passage, it is firm that PVC drainage pipe 7 or PVC fill with between sandpipe 15 and waterproofing course 10 structures, PVC drainage pipe 7 or PVC fill with between sandpipe 15 and concrete floor 11 structures palpus waterproof.
Further, in step (8), (10), sedimentation basin gutter 22 carries switch valve 19, in the time that needs drain sedimentation basin 12 and catchment, can manually opened switch valve 19, and carry out draining.
Further, in step (9), (10), in PVC drainage pipe 7, be provided with low level gutter 23, a high-order gutter that carries switch valve 19 that a main drainpipe that carries switch valve 19 and pressure valve 18 20, one carry switch valve 19.When normal work, the switch valve 19 of main drainpipe 20 is in opening, and the switch valve 19 of low level gutter 22 and high-order gutter is in closed condition; When needs are down to groundwater pressure when minimum, can manually opened low level gutter 23 switch valves 19, carry out free-draining.
Further, in step (9), (10), the control water pressure that in PVC drainage pipe 7, the hydraulic pressure of main drainpipe 20 pressure valve 18 setting value need require according to foundation ditch anti-floating is determined, in the time that underground water hydraulic pressure is greater than setting value, pressure valve 18 is opened automatically, and main drainpipe 20 starts draining; In the time that hydraulic pressure is less than setting value, pressure valve 18 is closed automatically, and main drainpipe 20 stops draining.
Further, in step (9), (10), collecting-tank drinking-water pipe 14 is with water pump and Circuits System, and the switch control of water pump comprises automatically and manual two kinds of modes.Usually while work, switch control is in auto state, and water pump can open and close automatically draining according to collecting-tank 13 water level situations.In the time that needs drain collecting-tank and catchment, need first switch control is switched to manual mode from auto state, can adopt manual control to carry out opening and closing draining; When manual off switch, switch control automatically switches to auto state.
Further, in step (9), (10), a kind of underground construction drainage and anti-float device is provided with two PVC that carry switch valve 19 and fills with sandpipe 15, it is characterized in that: in the process of drainage pressure-reducing, tiny silt particle in ground may be followed flowing water through filtration beds 6,8, and flows into sedimentation basin 12 through PVC drainage pipe 7, forms silt particle and runs off, its consequence may cause the soil body loose near the catch pit borehole wall 4 or shaft bottom, further may form cavity.A kind of underground construction drainage and anti-float device adopts catch pit drainage pattern; filtration beds 6,8 in catch pit adopts and is arranged vertically; under Action of Gravity Field; sand grains in filtration beds 6,8 can form pressure at right angle and lateral pressure; and near the soil body borehole wall 4 is formed to support action; the tiny silt particle that this support action can hinder in the soil body on the one hand runs off with flowing water; on the other hand; in the time having there is silt particle loss; sand grains in filtration beds 6,8 can carry out densification or filling near the loose earth borehole wall 4 in time, can stop tiny silt particle to occur further to run off.Its form of expression is that sedimentation can occur the filtration beds 6 of well mouth of drainage well part, between filtration beds 6 and well head place base plate of foundation pit, " coming to nothing " can occur; In addition, in sedimentation basin 12, also can find that there is too much mud and sand silting.
Further, in step (9), (10), a kind of underground construction drainage and anti-float device is provided with two PVC that carry switch valve 19 and fills with sandpipe 15, it is characterized in that: make regular check on silt particle situation in sedimentation basin 12, in the time that in sedimentation basin 12, mud and sand silting is more, in catch pit, between filtration beds 6 and well head place base plate of foundation pit 11, may there is " coming to nothing ", need in catch pit, fill with sand, to fill in time " coming to nothing " space being produced because of filtration beds 6 sedimentations.Its work flow is:
The 1st step, manually opened collecting-tank drinking-water pipe 14 switch valves carry out draining, catchment to get rid of collecting-tank 13;
The 2nd step, opens sedimentation basin gutter 22 switch valves 19, gets rid of sedimentation basin 12 and catchments;
The 3rd step, low level gutter 23 switch valves 19 of unlatching PVC drainage pipe 7, carry out free-draining, and cut out main drainpipe 20 switch valves 19 of PVC drainage pipe 7;
The 4th step, opens two PVC and fills with sandpipe 15 switch valves 19, and a PVC fills with the medium coarse sand sand aqueous mixtures of the interior perfusion particle diameter of sandpipe 15 2 ~ 5mm wherein, and closes low level gutter 23 switch valves 19 of PVC drainage pipe 7;
The 5th step, in the time that another root PVC filling sandpipe 15 has sand aqueous mixtures to overflow, stops filling with sand, and opens low level gutter 23 switch valves 19 of PVC drainage pipe 7;
The 6th step, opens after main drainpipe 20 switch valves 19 of PVC drainage pipe 7, closes low level gutter 23 switch valves 19 of two PVC fillings sandpipe 15, sedimentation basin gutter 22 and PVC drainage pipes 7;
The 7th step, manual-lock collecting-tank drinking-water pipe 14 switch valves, make the 14 switch controls of collecting-tank drinking-water pipe in auto state.
Further, in step (9), (10), a kind of underground construction drainage and anti-float device is established, it is characterized in that: the drain discharge of making regular check on PVC drainage pipe 7, in the time that drain discharge diminishes, analyze and get rid of beyond other influences factor, having a reason is exactly that trap drainage layer 6,8 may stop up.Now, can carry out backwash to injection pressure water in catch pit, its work flow is: first, open a PVC and fill with sandpipe 15 switch valves 19, close main drainpipe 20 switch valves 19 of PVC drainage pipe 7; Then, open the high-order gutter switch valve 19 of PVC drainage pipe 7, and to Pressure Casting clear water in high-order gutter, filtration beds 6,8 is carried out to back flush, to develop being blocked in the silt particle filtering in metafiltration 6,8 aquaporins, after dredging drainage passage, stop pressure injection clear water; Finally, open after main drainpipe 20 switch valves 19 of PVC drainage pipe 7, the high-order gutter and the PVC that close PVC drainage pipe 7 fill with sandpipe 15 switch valves 19.
Further, in step (1), in (10), a kind of underground construction drainage and anti-float device, is characterized in that: multiple catch pits can connect into a drainage and anti-float system by gutter, each catch pit can have sedimentation basin 12 alone, and multiple catch pits can share a collecting-tank 13.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the modification above examples of implementation done according to technical spirit of the present invention, all belong in the scope of technical solution of the present invention.

Claims (10)

1. a construction technology for underground construction drainage and anti-float device, is characterized in that, carries out as follows:
(1) construction well head, excavation pit, to well mouth of drainage well elevation place, applies concrete cushion and catch pit fore shaft circle reinforced concrete structure;
(2) behind rig location, hole, after pore-forming, carry out hole clearly, and filtration beds at the bottom of backfill hole;
(3) in hole, lift non-fine concrete chimney filter, and between hole wall and non-fine concrete chimney filter backfill filtration beds;
(4) in non-fine concrete chimney filter, inject water flushing, until after well water change clearly, filtration beds at the bottom of backfill non-fine concrete chimney filter pipe;
(5) in non-fine concrete chimney filter, lift PVC drainage pipe, and between non-fine concrete chimney filter and PVC drainage pipe backfill filtration beds;
(6) extract non-fine concrete chimney filter, and to backfill filtration beds between PVC drainage pipe and the borehole wall, filtration beds end face need flush with catch pit fore shaft circle reinforced concrete structure end face;
(7) lay waterproof layer structure under base plate of foundation pit, fill with behind sandpipe location construction foundation pit reinforced concrete floor at PVC;
(8) behind sedimentation basin overfall gap, sedimentation basin gutter location, the compartment wall between construction sedimentation basin and collecting-tank;
(9) PVC drainage pipe, collecting-tank drinking-water pipe and PVC are installed and fill with sandpipe, thereby form drainage and anti-float device;
(10) drainage and anti-float device is started to debugging, after having debugged, enter normal work.
2. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, is characterized in that: in step (1) to (9) step, according to groundwater level situation, can be aided with dewatering measure, groundwater level is down to below well head elevation; In step (2), according to different geological conditions, in pore forming process, can adopt mud off, must be by empty quarrel at the bottom of the cleaning hole of clear hole after pore-forming.
3. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, is characterized in that: in step (2), (3), filtration beds must adopt particle diameter 2 ~ 5mm medium coarse sand, and filtration beds thickness is not less than 30cm; In step (6), backfill filtration beds must be closely knit, and filtration beds must adopt particle diameter 2 ~ 5mm medium coarse sand; In step (4), (5), filtration beds must adopt particle diameter 5 ~ 10mm cobble, and filtration beds thickness is not less than 30cm.
4. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, it is characterized in that: in step (4), by injecting clear water in the filtration beds between hole wall and non-fine concrete chimney filter, and the muddy water in non-fine concrete chimney filter is extracted out, until well water becomes clear water.
5. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, is characterized in that: in step (5), PVC drainage pipe need be positioned at catch pit axis place; In the scope from the drainage pipe of 1m to PVC below well mouth of drainage well bottom, on PVC drainage pipe tube wall, drain hole is set, establishing the pipe exterior palpi parcel nonwoven of hole scope, the PVC drainage pipe bottom mouth of pipe must adopt nonwoven shutoff.
6. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, it is characterized in that: in step (7), PVC drainage pipe and PVC fill with sandpipe need penetrate the waterproof layer structure under base plate of foundation pit, to guarantee that catch pit and PVC drainage pipe or PVC fill with the draining between sandpipe or fill with the unimpeded of sand passage, PVC drainage pipe or PVC fill with sandpipe and waterproof layer structure it, that PVC drainage pipe or PVC fill with between sandpipe and concrete bottom plated construction palpus waterproof is firm.
7. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, it is characterized in that: in step (8), (10), sedimentation basin gutter carries switch valve, in the time that needs drain sedimentation basin and catchment, can manually opened switch valve, carry out draining.
8. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, it is characterized in that: in step (9), (10), in PVC drainage pipe, be provided with the high-order gutter that a main drainpipe that carries switch valve and pressure valve, low level gutter that carries switch valve, carry switch valve, when normal work, the switch valve of main drainpipe is in opening, and the switch valve of low level gutter and high-order gutter is in closed condition; When needs are down to groundwater pressure when minimum, can manually opened low level gutter switch valve, carry out free-draining;
In step (9), (10), the control water pressure that in PVC drainage pipe, the hydraulic pressure of main drainpipe pressure valve setting value need require according to foundation ditch anti-floating is definite, and in the time that underground water hydraulic pressure is greater than setting value, pressure valve is opened automatically, and main drainpipe starts draining; In the time that hydraulic pressure is less than setting value, pressure valve is closed automatically, and main drainpipe stops draining;
In step (9), (10), collecting-tank drinking-water pipe is with water pump and Circuits System, the switch control of water pump comprises automatically and manual two kinds of modes, usually while work, switch control is in auto state, water pump can open and close automatically draining according to collecting-tank water level situation, in the time that needs drain collecting-tank and catchment, need first switch control to be switched to manual mode from auto state, can adopt manual control to carry out opening and closing draining, when manual off switch, switch control automatically switches to auto state.
9. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, it is characterized in that: in step (9), (10), PVC fills with sandpipe two and carry switch valve, in the process of device drainage pressure-reducing, tiny silt particle in ground may be followed flowing water through filtration beds, and flows into sedimentation basin through PVC drainage pipe, forms silt particle and runs off, its consequence may cause the soil body loose near the catch pit borehole wall or shaft bottom, further may form cavity, device adopts catch pit drainage pattern, filtration beds in catch pit adopts and is arranged vertically, under Action of Gravity Field, sand grains in filtration beds can form pressure at right angle and lateral pressure, and the soil body of Around A Borehole is formed to support action, the tiny silt particle that this support action can hinder in the soil body on the one hand runs off with flowing water, on the other hand, in the time having there is silt particle loss, sand grains in filtration beds can carry out densification or filling to the loose earth of Around A Borehole in time, can stop tiny silt particle to occur further to run off, its form of expression is that sedimentation can occur the filtration beds of well mouth of drainage well part, between filtration beds and well head place base plate of foundation pit, can there is " coming to nothing ", in addition, in sedimentation basin, also can find that there is too much mud and sand silting, make regular check on the drain discharge of PVC drainage pipe, in the time that drain discharge diminishes, analyze and get rid of beyond other influences factor, having a reason is exactly that trap drainage layer may stop up, now, can carry out backwash to injection pressure water in catch pit, its work flow is: first, open a PVC and fill with sandpipe switch valve, close the main drainpipe switch valve of PVC drainage pipe, then, open the high-order gutter switch valve of PVC drainage pipe, and to Pressure Casting clear water in high-order gutter, filtration beds is carried out to back flush, to the silt particle being blocked in filtration beds drainage passage is developed, after dredging drainage passage, stop pressure injection clear water, finally, open after the main drainpipe switch valve of PVC drainage pipe, the high-order gutter and the PVC that close PVC drainage pipe fill with sandpipe switch valve, make regular check on silt particle situation in sedimentation basin, in the time that in sedimentation basin, mud and sand silting is more, in catch pit, between filtration beds and well head place base plate of foundation pit, may there is " coming to nothing ", need in catch pit, fill with sand, to fill in time " coming to nothing " space being produced because of filtration beds sedimentation, specifically its work flow is:
The 1st step, manually opened collecting-tank drinking-water pipe switch valve carries out draining, catchments to get rid of collecting-tank;
The 2nd step, opens sedimentation basin gutter switch valve, gets rid of sedimentation basin and catchments;
The 3rd step, the low level gutter switch valve of unlatching PVC drainage pipe, carries out free-draining, and cuts out the main drainpipe switch valve of PVC drainage pipe;
The 4th step, opens two PVC and fills with sandpipe switch valve, and a PVC fills with the medium coarse sand sand aqueous mixtures of perfusion particle diameter 2 ~ 5mm in sandpipe wherein, and closes the low level gutter switch valve of PVC drainage pipe;
The 5th step, in the time that another root PVC filling sandpipe has sand aqueous mixtures to overflow, stops filling with sand, and opens the low level gutter switch valve of PVC drainage pipe;
The 6th step, opens after the main drainpipe switch valve of PVC drainage pipe, closes the low level gutter switch valve of two PVC fillings sandpipe, sedimentation basin gutter and PVC drainage pipes;
The 7th step, manual-lock collecting-tank drinking-water pipe switch valve, makes the control of collecting-tank drinking-water pipe switch in auto state.
10. the construction technology of a kind of underground construction drainage and anti-float device according to claim 1, it is characterized in that: in step (1) in (10), multiple catch pits can connect into a drainage and anti-float system by gutter, each catch pit can have sedimentation basin alone, and multiple catch pits can share a collecting-tank.
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CN105201000A (en) * 2015-09-28 2015-12-30 中国十七冶集团有限公司 Wide foundation pit precipitation method capable of remotely monitoring
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CN111608171A (en) * 2020-05-27 2020-09-01 中国一冶集团有限公司 Sandbar underground soft base pipe, well precipitation anti-floating pipe pile structure and construction method

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