CN109736340B - Dewatering device and method for guaranteeing integrity of cushion layer by reserving dewatering well on foundation slab - Google Patents
Dewatering device and method for guaranteeing integrity of cushion layer by reserving dewatering well on foundation slab Download PDFInfo
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Abstract
The invention relates to a dewatering device and a method for guaranteeing the integrity of a cushion layer by reserving a dewatering well on a foundation slab, which are characterized by comprising a drainage pipe, a pump, a well point pipe, a water filter pipe and a water suction pipe; and a dewatering pipe well arranged in the aquifer below the foundation bed layer and the foundation surface, gravel filter materials outside the dewatering well pipe and water-washed gravel filter materials inside the dewatering well pipe; the water suction pipe is arranged below the foundation cushion layer and is connected with the pump; the other end is connected with a well point pipe, and the lower part of the well point pipe is provided with a strainer pipe; the well point pipe and the water filter pipe are arranged in the downcomer well, and the well point pipe and the water filter pipe are filled with washing gravel sand filter materials; the upper end of the strainer pipe at the lower part of the well point pipe. When the excavation of the foundation pit is finished and the dewatering pipe well needs to be reserved below the foundation slab to continue dewatering operation, the method is adopted. The invention has simple equipment and convenient operation, improves the construction efficiency and the quality of the waterproof layer, and can avoid potential safety hazards caused by construction cross operation of a concrete cushion layer, the waterproof protective layer, a foundation slab and the like.
Description
Technical Field
The invention relates to the construction of foundation pit excavation dewatering, concrete cushion layers, waterproof protective layers and foundation bottom plates in the field of buildings, in particular to a dewatering device and a dewatering method for guaranteeing the integrity of the cushion layers by reserving dewatering wells on the foundation bottom plates.
Background
When the foundation pit is excavated, if the underground water level is higher than the basement, the foundation pit dewatering operation is required in the excavation and civil engineering of the foundation pit, and the underground water level is reduced to 0.5m below the basement (or the design requirement is met).
The pipe well dewatering is one of the main methods of foundation pit dewatering, when the foundation pit area is large (or a relative water-resisting layer is in the water-bearing layer), the dewatering pipe well is arranged outside the foundation pit, and the dewatering can not meet the design construction requirements, the dewatering pipe well is required to be arranged inside the foundation pit to carry out dewatering operation, so as to meet the design construction requirements of foundation pit excavation and subsequent civil engineering, if the dewatering pipe well still exists below the foundation pit in the foundation pit after the foundation pit is excavated, the dewatering pipe well part is required to be reserved in the subsequent foundation pad layer construction to continue the dewatering operation, so that the foundation pad layer has an incomplete surface, a complete waterproof layer can not be manufactured in the subsequent waterproof layer construction, the waterproof protective layer and the foundation slab of the subsequent process have the same condition, meanwhile, in the construction process of the foundation slab, the reinforcing steel bar of the dewatering pipe well part needs to be cut off, the well head position is reserved for lifting or replacing a water pump in a water supply and reduction pipe well, a water discharge pipe and a water pump cable for reducing water also need to extend out of the foundation from the pipe well position, and cross operation is formed by binding with reinforcing steel bars, formwork erecting and concrete pouring of foundation construction, so that the construction efficiency is influenced and great potential safety hazards are generated. If the waterproof quality of the bottom plate at the downcomer well is not well treated, the serious consequences of water seepage of the bottom plate and long-term water immersion of the basement can be caused after the completion of the project. For example, the Chinese patent application number is: 201510323347.4 discloses a plugging structure of an anti-floating anchor rod in a deep well dewatering well in a foundation slab and a construction method thereof.
The existing foundation slab reserved dewatering well has the following better technical treatment measures:
the data source: BBS. construction technology (Share) how to block the dewatering well in the post-cast strip of deep foundation raft plate of building (published in 2018.7.30)
1. The hot-rolled seamless steel pipe with the diameter of 325 multiplied by 8 is adopted to manufacture the waterproof steel sleeve, and the height of the waterproof steel sleeve is not less than the sum of the thicknesses of the concrete bottom plate and the cushion layer.
2. And (3) processing the waterproof sleeve water stop outer ring, selecting a steel plate with the thickness not less than 6mm to process the water stop ring according to the outer diameter of the steel sleeve, wherein the outer diameter of the outer ring is not less than 525 mm.
3. And welding a water stop outer ring. The water-stopping outer ring is positioned in the middle of the height of the waterproof steel sleeve.
4. And (4) performing bolt welding on the water-stopping inner ring, selecting a pipe flange and a pipe flange cover which are consistent with the steel sleeve according to the inner diameter of the waterproof steel sleeve, and welding bolts on the pipe flange.
5. And welding the pipe flange at the middle part of the height of the sleeve.
6. And welding the steel sleeve base. 4 reinforcing steel bars with the diameter of phi 20 and the length of 150mm are selected and symmetrically welded at the bottom of the waterproof casing.
7. Fixed waterproof steel sleeve
Before the bottom plate concrete cushion is poured, the steel sleeve is fixed on a precipitation wellhead above the center of the precipitation well, and a precipitation water pump penetrates through the steel sleeve and is placed into the precipitation well for precipitation.
8. Waterproof layer construction at steel sleeve
When the waterproof layer of the bottom plate is constructed, the waterproof layer is turned upwards to the bottom of the water stop ring on the outer side of the waterproof steel sleeve, and waterproof closing-up treatment is carried out by adopting sealing cement.
9. Construction of floor structures
When the bottom plate steel bars are bound, construction is carried out on the periphery of the waterproof casing according to installation paper and design requirements, and additional steel bars are additionally arranged.
10. Plugging of dewatering well
When the precipitation is allowed to stop according to the design requirement, the precipitation in the foundation pit is stopped firstly, and after the precipitation well is blocked, the precipitation outside the foundation pit is stopped, so that the water pressure in the foundation pit when the precipitation well is blocked is reduced, and the precipitation well in the foundation pit is conveniently blocked; and after the dewatering well in the foundation pit stops dewatering, the graded sandstone is backfilled at the bottom of the dewatering well, and the common Portland dry cement is backfilled in the depth range of 2.0m at the upper part of the dewatering well.
11. Waterproof steel sleeve flange seal
Manufacturing a rubber gasket according to the size of the pipe flange cover plate and bolt holes, wherein the thickness of the rubber gasket is 10 mm; the rubber gasket which is manufactured in advance is sleeved on the bolt of the steel sleeve, the pipe flange cover is placed, and nuts are screwed by the socket spanner in a symmetrical and staggered mode, so that the flange cover plate is guaranteed to be tightly sealed and does not leak air.
12. Pouring concrete
After the flange cover plate is determined to be sealed and accepted strictly, the steel sleeve is cleaned, dry and hard concrete which is higher than the bottom plate concrete by one grade is poured in the pipe on the upper part of the cover plate, and simultaneously, micro-expansion concrete which is higher than the bottom plate concrete by one grade is synchronously poured in the reserved hole of the bottom plate outside the sealed steel sleeve, so that the concrete is vibrated and compacted.
13. Concrete curing
Before the concrete reaches initial setting, secondary rolling is carried out to reduce the plastic shrinkage of the concrete, a plastic film is covered on the surface, and the micro-expansion concrete is maintained for not less than 14 days.
For the problem of the treatment technical measures of the existing foundation slab reserved dewatering well, the treatment measures of the foundation slab reserved dewatering well introduced above are a better treatment method at present, but still have many defects, specifically:
● the waterproof steel sleeve needs more materials and is complicated in manufacturing process. The steel sleeve is made of a phi 325 multiplied by 8 hot-rolled seamless steel pipe, and the height is not less than the sum of the thicknesses of the concrete bottom plate and the cushion layer. The material made of a waterproof steel sleeve needs a phi 325 multiplied by 8 hot-rolled seamless steel pipe with the length of about 0.5 to 1.0m (the thickness of a concrete bottom plate is generally 0.4 to 1.0 m); the outer diameter of the outer ring is not less than 525 mm; welding bolts to the pipe flange by the pipe flange and the pipe flange cover which are matched with the sleeve; and welding the steel sleeve base. 4 reinforcing steel bars with the diameter of phi 20 and the length of 150mm are selected and symmetrically welded at the bottom of the waterproof casing. Except materials, the hot-rolled seamless steel pipe with phi 325 multiplied by 8 is cut only in the processing content; manufacturing a water stop ring and a pipe flange cover; the length of a double-side welding seam is more than two meters when the water stop ring, the pipe flange and the waterproof steel sleeve are welded, the pipe flange and the waterproof sleeve need to be welded in the steel pipe, and the welding difficulty is higher; welding bolts and pipe flanges and welding steel bars of a steel sleeve base.
● the process is complicated. The method is used for solving the problem of the dewatering well, and comprises the steps of manufacturing a waterproof steel sleeve, fixing the waterproof steel sleeve, constructing a waterproof layer at the position of the steel sleeve, additionally arranging an additional steel bar (special design) during the construction of a bottom plate structure, plugging the dewatering well, sealing a flange of the waterproof steel sleeve, pouring concrete, maintaining concrete and the like, and relates to a plurality of work types such as cutting, welding, manufacturing the steel bar, waterproof operation, pouring concrete and the like.
● cross operation, reduces work efficiency and increases safety hidden trouble. During the construction of bed course, waterproof layer, reinforcement, formwork, concrete pouring, the cable conductor of precipitation well(s), drain pipe need the overhead outside extension to the foundation bottom plate, cause great influence for the civil engineering construction, both influenced the efficiency of construction, brought the potential safety hazard again.
● the quality of water resistance remains a concern. Because the construction process has multiple working procedures and various work types, the leakage of the bottom plate can be caused when any link has a problem; meanwhile, although a plurality of waterproof measures are adopted, the waterproof layer is not completely closed.
● engineering costs are high. The direct cost consumption of the reserved dewatering well treatment comprises various material consumption, labor and mechanical working hour consumption, the indirect cost consumption comprises the construction efficiency loss caused by the reserved dewatering well treatment, and the indirect cost consumption is far greater than the direct cost consumption.
Disclosure of Invention
The invention aims to overcome the defects of the existing foundation slab reserved dewatering well treatment technical measures, and provides a dewatering device and a dewatering method which have simple equipment and convenient operation and use and can thoroughly solve the problem that the integrity of a foundation mat is damaged by the dewatering well reserved on the foundation slab, so that the integrity of the foundation mat is ensured, the construction efficiency of the foundation mat, a waterproof layer, a concrete protective layer and a concrete slab can be improved, the construction cost is reduced, the quality of the waterproof layer is improved, and potential safety hazards caused by cross operation and the like are avoided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a dewatering device for guaranteeing the integrity of a cushion layer by a dewatering well reserved on a foundation slab comprises a drainage pipe and a pump, wherein the outer drainage pipe is connected with a drainage port of the pump; the pump is arranged outside the foundation slab and in the construction operation surface; the method is characterized in that: also comprises a well point pipe, a strainer pipe and a water suction pipe; and a precipitation well pipe arranged in the aquifer below the foundation bed layer and the foundation surface, gravel filter materials outside the precipitation well pipe and water-washed gravel filter materials inside the precipitation well pipe; wherein:
the water suction pipe is arranged below the foundation cushion layer and is connected with the pump; the other end is connected with a well point pipe, and the lower part of the well point pipe is provided with a strainer pipe; the well point pipe and the water filter pipe are arranged in the dewatering well pipe, and the well point pipe and the water filter pipe are filled with washing gravel sand filter materials;
the upper end of the strainer pipe at the lower part of the well point pipe; and the water level in the precipitation well can reach the position in the precipitation process.
The method for using the dewatering device for ensuring the integrity of the cushion layer of the foundation slab reserved dewatering well is characterized in that: when the excavation of the foundation pit is finished and the precipitation pipe well needs to be reserved below the foundation slab to continue precipitation operation, the concrete method of the precipitation operation is as follows:
(1) selecting a pump, a drain pipe, a water suction pipe, a well point pipe and a strainer pipe which can meet the requirements according to the water outlet condition of the downcomer well;
(2) a pump is arranged in the foundation pit working surface outside the foundation slab, and the closer the pump is to the precipitation well, the better the pump is; installing pump drainage pipes, and arranging the drainage pipes to a planned drainage point; connecting the pump and the water suction pipe to the position of the dewatering well; well point pipes and strainer pipes to be put into the dewatering well are connected for standby; conveying the water-washed gravel sand to be backfilled into the dewatering well to a dewatering well mouth for later use;
(3) closing and pulling out the submersible pump for precipitation in the precipitation well, inserting the connected water filter pipe and well point pipe, filling the water-washed gravel sand into the precipitation well to 0.9-1.1 m above the water filter pipe, connecting the water suction pipe and the well point pipe, and starting the pump to pump water;
(4) digging a small groove, putting the water suction pipe into the groove, and driving the water suction pipe into the base by using a thin steel bar bent into a U shapeBottomFixing;
(5) observing the water level in the precipitation well, after the water level in the precipitation well is stable after water pumping and can meet the design construction requirements, backfilling and washing gravel sand to the base and tamping; recording the value of the vacuum gauge for comparison during subsequent precipitation maintenance;
compared with the prior art, the dewatering device and the method for ensuring the integrity of the cushion layer of the foundation slab reserved dewatering well have the following substantial characteristics and remarkable effects:
simple using equipment and convenient operation. Fundamentally has changed the foundation plate and has reserved the way that the precipitation well needs reserve the hole on foundation bed course, waterproof layer and foundation plate, bury underground waterproof steel casing, make the civil engineering become under the condition that there is the foundation plate to reserve the precipitation well with not reserving the precipitation well and construct, avoided waterproof layer construction quality hidden danger, avoided cross operation potential safety hazard, avoided the reduction of efficiency of construction that cross operation arouses, the people, machine, the material of having reduced foundation plate reservation precipitation well processing, the time input.
Drawings
FIG. 1 is a schematic diagram of the apparatus and method principles of the present invention.
FIG. 2 is a schematic illustration of the barrel arrangement of the present invention.
In the figure: the device comprises a drain pipe 1, a pump 2 (a vacuum pump, a self-priming pump and a centrifugal pump), a foundation bed course 3, a foundation surface 4, gravel filter materials 5 outside the precipitation well pipe, a precipitation well pipe 6, gravel sand filter materials 7 filled with water and washed in the precipitation well pipe, a well point pipe 8, a water level 9 in the precipitation well, a strainer 10 and a water suction pipe 11.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings
Foundation slab reserves precipitation well and guarantees precipitation device of bed course integrality
As shown in fig. 1 and 2, the dewatering device for guaranteeing the integrity of the cushion layer of the foundation slab reserved dewatering well comprises a drainage pipe 1, a pump 2, a well point pipe 8, a water filtering pipe 10 and a water suction pipe 11; and a precipitation well pipe 6 arranged in the aquifer below the foundation bed 3 and the foundation surface 4, a gravel filter material 5 outside the precipitation well pipe and a washing gravel filter material 7 inside the precipitation well pipe; wherein:
the outer drainage pipe is connected with a water outlet of the pump; the pump is arranged outside the foundation slab and in the construction operation surface (fertilizer tank). The water drainage pipe is an outer drainage pipe of the pump, and generally a plastic pipe and other hoses are used for draining water pumped by the pump out of the foundation pit or a designated water tank; the foundation ditch is darker, and the pump can not direct drainage outside the foundation ditch from drainage ability, when needing secondary drainage.
The water suction pipe is arranged in a small groove excavated below the foundation cushion layer, and is generally made of a plastic pipe (or a steel pipe), and the water suction pipe is pressed into the lower surface of the concrete cushion layer when the concrete cushion layer is beaten.
The water suction pipe is connected with a pump; the other end is connected with a well point pipe, and the lower part of the well point pipe is provided with a strainer pipe; the well point pipe and the water filter pipe are inserted into the dewatering well pipe, and water washing gravel sand filter materials are filled outside the dewatering well pipe; the well point pipe can be a steel pipe, a plastic pipe or a PVC pipe with the strength meeting the water absorption requirement, the water absorption pipe is inserted into the downcast pipe well, the upper end of the water absorption pipe is slightly lower than the base and is connected with the well point pipe, and the lower end of the well point pipe is connected with the water filter pipe.
The strainer is positioned at the bottom of the downcomer well or at about 6.0m (at the upper end of the strainer) below the basement. The diameter of the filter pipe (not less than the diameter of the well point pipe) and the length of the filter pipe are determined according to the water yield of the dewatering well, a water passing flower hole, a filter screen and a filter screen are arranged on the filter pipe, the lower end of the filter pipe is wrapped by the filter screen or a plug, and the upper end of the filter pipe is connected with the well point pipe. The upper end of the strainer pipe at the lower part of the well point pipe; and is also the position that the water level 9 in the precipitation well can reach during precipitation.
Dewatering method for guaranteeing integrity of cushion layer by reserving dewatering well on foundation slab
When the excavation of the foundation pit is finished and the dewatering pipe well needs to be reserved below the foundation slab to continue dewatering operation, the dewatering operation can be carried out by adopting a dewatering method that the dewatering well is reserved on the foundation slab to ensure the integrity of the cushion layer, and the concrete method is as follows:
(1) and selecting a pump, a drain pipe, a water suction pipe, a well point pipe and a strainer pipe which can meet the requirements according to the water outlet condition of the downcomer well.
(2) Installing a pump (selecting a pump, a self-sucking pump and a centrifugal pump as required) in the foundation pit operation surface (the fertilizer tank) outside the foundation slab, wherein the closer the pump is to the precipitation well, the better the pump is; installing pump drainage pipes, and arranging the drainage pipes to a planned drainage point; connecting the pump and the water suction pipe to the position of the dewatering well; well point pipes and strainer pipes to be put into the dewatering well are connected for standby; and conveying the water-washed gravel sand to be backfilled into the dewatering well to a dewatering well mouth for later use.
(3) Closing and pulling out the submersible pump for the precipitation in the precipitation well, inserting the connected water filter pipe and well point pipe (the upper end is slightly lower than the proper position of the substrate), filling the water-washed gravel sand into the precipitation well to about 1.0m above the water filter pipe, connecting the water suction pipe and the well point pipe, and starting the pump to pump water. The pump pumps water according to the working principle that the underground water is sucked into the pump and discharged by utilizing the vacuum negative pressure effect generated by the pump, the water suction depth can reach 10m (0 m of elevation) theoretically, and the suction depth of a general engineering construction pump is 5.0-6.0 m. The depth of the elevator shaft and the water collecting pit under the basement is generally about 3.0m, and the water level in the precipitation shaft is reduced to a position between 5.0 and 6.0m below the basement by using a pump in the precipitation shaft, so that the civil engineering design and construction requirements can be completely met.
(4) Digging a small groove, putting the water suction pipe into the groove, and driving the water suction pipe into the substrate for fixing by using a thin steel bar bent into a U shape.
(5) Observing the water level in the precipitation well, after the water level in the precipitation well is stable after water pumping and can meet the design construction requirements, backfilling and washing gravel sand to the base and tamping; and recording the value of the vacuum gauge for comparison during subsequent precipitation maintenance.
(6) And pouring a concrete cushion (civil engineering construction), driving the dewatering well and the water suction pipe into the concrete cushion, and reserving the dewatering well on the foundation slab to ensure that the concrete cushion of the integrity of the cushion is finished.
(7) And maintaining the pump precipitation process until the design and construction requirements are met.
(8) After the dewatering operation is completed, the pump is detached, and the end part of the water suction pipe can be selectively wrapped for protection so as to prevent the water on the bottom plate from being damaged and the water can be drained. The water suction pipe is generally a plastic pipe with the diameter less than 50mm, the water suction pipe is buried under the cushion layer, the bearing capacity of the foundation cannot be influenced, and cement slurry can be injected for filling if the design requirements are met.
Claims (1)
1. A precipitation method for guaranteeing the integrity of a cushion layer by a foundation slab reserved precipitation well adopts a precipitation device comprising a drain pipe (1) and a pump (2); the pump is a vacuum pump, and the drain pipe is connected with a drain outlet of the vacuum pump; the vacuum pump is arranged outside the foundation slab and in the construction operation surface; the method is characterized in that: the device also comprises a well point pipe (8), a strainer pipe (10) and a water suction pipe (11); and a precipitation well pipe (6) arranged in the aquifer below the foundation mat (3) and the foundation surface (4), gravel filter materials (5) outside the precipitation well pipe and water-washed gravel filter materials (7) inside the precipitation well pipe; wherein: the water suction pipe is arranged below the foundation cushion layer and is connected with a vacuum pump; the other end is connected with a well point pipe, and the lower part of the well point pipe is provided with a strainer pipe; the well point pipe and the water filter pipe are arranged in the dewatering well pipe, and the well point pipe and the water filter pipe are filled with washing gravel sand filter materials; the upper end of the strainer pipe at the lower part of the well point pipe; the water level (9) in the precipitation well can reach the position in the precipitation process; the concrete method of the adopted precipitation operation comprises the following steps:
(1) selecting a vacuum pump, a drain pipe, a water suction pipe, a well point pipe and a strainer pipe which can meet the requirements according to the water outlet condition of the downcomer well;
(2) installing a vacuum pump in the pit working surface outside the foundation slab, wherein the closer the vacuum pump is to the precipitation well, the better the vacuum pump is; installing a vacuum pump drain pipe, and arranging the drain pipe to a planned drain point; connecting a vacuum pump and a water suction pipe to the position of the dewatering well; well point pipes and strainer pipes to be put into the dewatering well are connected for standby; conveying the water-washed gravel sand to be backfilled into the dewatering well to a dewatering well mouth for later use;
(3) closing and pulling out the submersible vacuum pump for precipitation in the precipitation well, inserting the connected water filter pipe and well point pipe, filling the water-washed gravel sand into the precipitation well until the height of the water filter pipe is 0.9-1.1 m, connecting the water suction pipe and the well point pipe, and starting the vacuum pump to pump water;
(4) digging a small groove, putting the water suction pipe into the groove, and driving the water suction pipe into a substrate soil layer for fixing by using a thin steel bar bent into a U shape;
(5) observing the water level in the precipitation well, backfilling and washing gravel sand to the substrate after the water level in the precipitation well is stable and can meet the design and construction requirements after the vacuum pump pumps waterNoodleAnd tamping; recording the value of the vacuum gauge for comparison during subsequent precipitation maintenance;
(6) pouring a concrete cushion layer, namely pumping the dewatering well and the water suction pipe into the concrete cushion layer, and reserving the dewatering well on the foundation slab to finish the concrete cushion layer with the integrity guaranteed by the cushion layer;
(7) maintaining the dewatering process of the vacuum pump until the design construction requirements are met;
(8) after the dewatering operation is completed, the vacuum pump is detached, and the end part of the water suction pipe can be selectively wrapped for protection so as to prevent the water on the bottom plate from being damaged and the water can be drained.
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| CN110093930A (en) * | 2019-05-21 | 2019-08-06 | 中国葛洲坝集团第一工程有限公司 | Base pit engineering energy-saving and emission-reduction water system and method for supplying water |
| CN111305241A (en) * | 2019-12-18 | 2020-06-19 | 宁蔚蔚 | Method for treating quicksand in hole digging of manual hole digging pile through light well point dewatering |
| CN111021385A (en) * | 2019-12-18 | 2020-04-17 | 宁蔚蔚 | Precipitation method for treating quicksand when manual hole digging pile hole digging meets quicksand layer |
| CN112709247B (en) * | 2021-01-20 | 2022-05-31 | 北京城建道桥建设集团有限公司 | Subway construction dewatering system and method for complex ground |
| CN113863343A (en) * | 2021-09-22 | 2021-12-31 | 合诚工程咨询集团股份有限公司 | Construction method of dewatering well capable of being continuously utilized |
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| CN2557592Y (en) * | 2001-05-29 | 2003-06-25 | 韩晓迪 | Pumping equipment for sink well |
| CN101936010B (en) * | 2010-08-19 | 2012-02-08 | 天津二十冶建设有限公司 | Construction method of dewatering well in underground concrete structure |
| CN202194686U (en) * | 2011-08-03 | 2012-04-18 | 中铁十二局集团第四工程有限公司 | Well-point dewatering device at bottom of tunnel |
| CN103452124B (en) * | 2013-09-04 | 2015-10-28 | 中国十九冶集团有限公司 | Method and device for removing accumulated water in foundation pit |
| CN203924083U (en) * | 2014-06-27 | 2014-11-05 | 中国水利水电第十三工程局有限公司 | Cushion cap excavation of foundation pit well-points dewatering device |
| CN105625445B (en) * | 2014-11-06 | 2017-11-28 | 五冶集团上海有限公司 | A kind of Method on Dewatering of Foundation Pit of coastal sand soil area |
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