CN110219313B - Drainage system and construction method for underground construction blind well - Google Patents
Drainage system and construction method for underground construction blind well Download PDFInfo
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- CN110219313B CN110219313B CN201910485713.4A CN201910485713A CN110219313B CN 110219313 B CN110219313 B CN 110219313B CN 201910485713 A CN201910485713 A CN 201910485713A CN 110219313 B CN110219313 B CN 110219313B
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000010410 layer Substances 0.000 claims abstract description 68
- 238000005086 pumping Methods 0.000 claims abstract description 32
- 230000001681 protective effect Effects 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011241 protective layer Substances 0.000 claims abstract description 7
- 239000004744 fabric Substances 0.000 claims description 15
- 239000011083 cement mortar Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000004078 waterproofing Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000009435 building construction Methods 0.000 abstract description 2
- 239000002346 layers by function Substances 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
- 101150054854 POU1F1 gene Proteins 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Sewage (AREA)
Abstract
The invention belongs to the field of building construction, and particularly relates to an underground construction blind well drainage system and a construction method. The invention comprises a water collecting pit dug in a deep foundation pit, a water pumping system arranged in the water collecting pit and a drainage ditch dug on the top of the deep foundation pit; the pumping system is a submersible pump with a protective shell, and water in the water pit is discharged through the submersible pump; the periphery of the submersible pump protective housing of the water collection pit is filled with filtering fillers, construction is carried out after a foundation cushion layer, a waterproof layer and a concrete protective layer are sequentially poured on the soil wall, and corresponding backfilling of each functional layer is carried out on the water collection pit before raft pouring. The drainage system has good stability and strong anti-interference performance; the drainage pipe does not pass through the waterproof layer and the raft foundation, construction is not disturbed, pumping water can not be stopped in the whole pouring process, drainage is prevented from being stopped in the concrete pouring process due to the fact that the drainage pipe passes through the foundation, and the problem of leakage caused by the waterproof of the raft foundation is avoided; the whole construction operation is safe and reliable, and the quality is ensured.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to an underground construction blind well drainage system and a construction method.
Background
In the construction of building foundation in the region rich in groundwater, in the foundation earthwork excavation, cushion layer construction and foundation raft construction stages, the drainage in the foundation pit is required to be continuously pumped out, normal construction is ensured, and construction quality is ensured. The traditional construction process mode has the following technical problems: firstly, the secondary pipe wells around the raft foundation are used for dewatering, so that the problems of long construction period, difficult dewatering and drainage operation and poor effect exist; secondly, the drain pipe of the dewatering well arranged at the pit bottom passes through the waterproof layer, has interference influence on cushion construction, waterproof construction and binding of raft steel bars, cuts off the drain pipe when pouring the raft, and relies on raft concrete to block the drain pipe, so that the drain pipe cannot be blocked rapidly, and has hidden danger to the pouring construction quality of the raft concrete.
Disclosure of Invention
The invention aims at: aiming at the problems, the drainage system and the construction method for the blind well for underground construction are provided, the drainage effect of the drainage system is optimized, the drainage pipe does not penetrate through the waterproof layer and the raft concrete foundation, and the drainage system is ensured not to interfere with construction.
The invention comprises the following technical scheme:
the drainage system for the blind well for underground construction comprises a water collecting pit, a pumping system and a drainage ditch, wherein the water collecting pit is dug at the lowest part of a deep foundation pit; the water pumping system comprises a submersible pump, a submersible pump outer cover is provided with a submersible pump protection shell, the height of the submersible pump protection shell is close to the top surface of a water collecting pit, a plurality of water inlets are formed in the lower portion of the side face of the submersible pump protection shell at a certain distance, an outlet is formed in the upper portion of the side face of the submersible pump protection shell, a water drain pipe of the submersible pump is discharged, and an upper cover is arranged on the submersible pump protection shell; the retaining wall around the deep foundation pit is dug with a containing groove for a drain pipe to be paved to the drainage ditch on the top of the deep foundation pit along the retaining wall, and the drain pipe is coated with a layer of cement mortar; the periphery of the submersible pump protective shell of the water collection pit is filled with filtering filler, and impermeable cloth is paved on the filtering filler; the retaining wall surface and the anti-seepage cloth surface on which the drain pipe is installed are provided with foundation cushions, the cushions are provided with waterproof layers, and concrete protection layers are arranged on the waterproof layers.
Further, the filtering filler is graded pebbles, the grain size of the graded pebbles is not smaller than 20mm, and the water collection pit is filled with the graded pebbles. The graded pebbles can filter accumulated water, effectively support a pumping system, limit the particle size of the graded pebbles, ensure the filtering effect of the graded pebbles, and avoid unsmooth pumping. And a layer of impermeable cloth is paved between the upper layer of the graded pebble and the foundation cushion layer, and the impermeable cloth can be geotechnical cloth, so that the influence on the gap of the graded pebble during pouring of the cushion layer is prevented.
Further, a filter screen is arranged on the periphery of the water inlet hole of the submersible pump protective housing in a surrounding mode. The filter screen can effectively filter the inflow water, and prevent excessive slag from affecting the normal operation of the submersible pump.
Further, the drain pipe may be a stainless steel hose. Alternatively, a stainless steel hose can be selected, and the drain pipe can be kept at a certain rigidity on the premise of being convenient to lay, so that the drain pipe is not easy to damage.
Further, the thickness of the cement mortar layer outside the drain pipe is 50mm-100mm. The cement mortar layer is used as a protective layer of the drain pipe to protect and support the drain pipe, so that the drain pipe is prevented from being crushed by the foundation bed layer concrete to influence the drain pipe.
Further, the distance between the submersible pump protective housing and the top surface of the water collection pit is 50-100mm. The submersible pump protective shell is arranged at a distance from the top surface of the water collection pit, and the submersible pump protective shell can be plugged in advance by utilizing a steel plate or concrete in the later plugging process.
Further, the number of the pumping systems is at least 2, and the pumping systems are distributed in the water collecting pit. The two pumping systems are selected to be used as alternatives to each other so as to prevent the construction from being influenced by the failure of one pumping system.
Further, the water collection pit is inclined at a gradient of 3 degrees, so that water in the deep foundation pit is convenient to collect into the bottom of the water collection pit.
The invention also comprises a construction method of the underground blind well drainage system, which comprises the following steps:
1) Digging a water collecting pit with a certain depth at the lowest part of the deep foundation pit, and digging a drainage ditch at the top of the deep foundation pit;
2) The water pumping system is arranged at the lowest part of the water collecting pit in a scattered way, a containing groove matched with the pipe diameter of the water draining pipe is dug on the retaining wall surface, the interval distance between the water draining pipe surface and the foundation cushion layer is reserved, and the water draining pipe of the water pumping system is paved outside the retaining wall in the containing groove and is communicated with the water draining ditch on the top of the deep foundation pit;
3) Cement mortar with the same thickness as the reserved interval distance of the foundation mat layer is smeared on the surface layer of the drain pipe; backfilling filtering filler around the submersible pump protective housing of the water collection pit so as to be flush with the submersible pump protective housing; paving a layer of impermeable cloth on the surface of the filtering filler;
4) A foundation cushion layer, a waterproof layer, a concrete protection layer and a raft layer are sequentially arranged on the surface of the retaining wall and the surface of the impermeable cloth on which the drain pipe is arranged from bottom to top, and holes of a submersible pump protection shell are reserved;
5) Before a raft foundation is poured, placing a steel plate pouring foundation cushion layer on a submerged pump protective shell in a hole, finishing waterproofing, arranging a protective layer, and overlapping and welding raft bottom reinforcing steel bars at the reserved hole positions to repair the raft bottom reinforcing steel bars;
6) And (3) the construction is completed by backfilling the raft pouring foundation pit, and drainage is not stopped in the process of backfilling the periphery of the raft pouring and deep foundation pit.
Further, the mixing mass ratio of the cement mortar is 1:2.
due to the adoption of the technical scheme, the invention has the advantages that: the simple and stable pumping system consisting of the water collecting pit, the pumping system and the drainage ditch is arranged, and has the characteristics of good pumping effect, high stability and high anti-interference performance; the fixed thinking of the prior art is broken, the drainage pipe is arranged below the waterproof layer and the foundation mat layer, the drainage pipe does not penetrate through the foundation mat layer, the waterproof layer and the raft foundation, construction is not disturbed, water pumping can not be stopped in the whole pouring process, the drainage pipe is prevented from penetrating through the foundation, and a measure of stopping drainage in the concrete pouring process is needed; meanwhile, the poor stability of the cushion layer and the waterproof construction in the initial stage is avoided, the phenomenon that water pressure is extruded to other parts due to the fact that water pumping is stopped too early and accumulated water cannot be collected and pumped out is avoided, the stability of the cushion layer, the waterproof layer and the like is damaged, and the leakage problem of the waterproof of a raft foundation is avoided; the construction environment can be kept concise in the construction process of the scheme, the construction quality of foundation construction is improved, the difficulty of foundation pit drainage is solved, meanwhile, drainage is stopped after the raft is poured or the periphery of the foundation pit is backfilled, and the whole construction operation is safe and reliable and the quality is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a drainage system for an underground construction blind well of the present invention;
in fig. 1, 1 is a water collecting pit, 2 is a submersible pump, 3 is a submersible pump protective shell, 4 is a water inlet hole, 5 is a water drain pipe, 6 is a cement mortar layer, 7 is geotechnical cloth, 8 is a foundation pad layer, 9 is a waterproof layer, 10 is a protective layer, and 11 is an upper cover.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
As shown in fig. 1, the drainage system for the blind well for underground construction comprises a water collecting pit 1 dug in a deep foundation pit, a water pumping system arranged in the water collecting pit 1 and a drainage ditch dug on the top of the deep foundation pit; the water pumping system comprises a submersible pump 2, wherein a submersible pump protective shell 3 is arranged on the outer cover of the submersible pump 2, the height of the submersible pump protective shell is 100mm away from the top surface of a water collecting pit, water inlet holes 4 are formed in the lower portion of the side surface of the submersible pump protective shell 3, which is located at the water collecting pit 1, at a certain distance, an outlet is formed in the upper portion of the side surface of the submersible pump protective shell 3, a water drain pipe 5 of the submersible pump is discharged, a retaining wall around a deep foundation pit is dug with a containing groove for the water drain pipe 5 to be paved to a water drain ditch on the top of the deep foundation pit along the retaining wall; the drain pipe 5 is coated with a 100mm cement mortar layer 6; the periphery of the submersible pump protective shell 3 of the water collection pit is filled with filtering fillers, the filtering fillers are graded pebbles, the particle size of each graded pebble is not smaller than 20mm, and geotechnical cloth 7 is paved on the filtering fillers; the retaining wall surface of the drain pipe 5 and the surface of the geotechnical cloth 7 are installed, a 100mm concrete foundation cushion layer 8 is poured, a waterproof layer 9 is arranged on the cushion layer, the waterproof layer is a waterproof coiled material, a 50mm concrete protection layer 10 is arranged on the waterproof layer, and raft plates (not shown in the figure) are installed on the concrete protection layer 10.
The periphery of the water inlet 4 of the submersible pump protective housing 3 is provided with a filter screen. The submersible pump protective housing 3 is provided with an upper cover 11; the upper cover is made of a 5mm thick steel plate and is in an embedded sealing cover mode, so that the cover plate can detachably seal the submersible pump protective shell, and the overhaul of the pumping system is facilitated when the submersible pump protective shell is not backfilled. The drain pipe 5 is a stainless steel hose. The water collection pit 1 is inclined at a gradient of 3 degrees, so that water in a deep foundation pit is convenient to collect into the bottom of the water collection pit 1.
In a preferred scheme of the embodiment, the number of the pumping systems is 2, and the pumping systems are distributed in the water collecting pit 1. Two pumping systems are selected, which may be alternatives to each other.
The construction steps of the drainage system of the underground construction blind well are as follows:
1) Digging a water collecting pit 1 with the depth of 800 x 800 mm at the lowest position of a deep foundation pit, and digging a drainage ditch at the top of the deep foundation pit;
2) The water pumping system with the height of 900mm is arranged at the lowest part of the water collecting pit 1 in a scattered way, a containing groove matched with the pipe diameter of the water draining pipe 5 is dug on the retaining wall surface, the interval distance between the water draining pipe surface and the foundation cushion layer 8 is reserved, and the water draining pipe 5 of the water pumping system is paved outside the retaining wall in the containing groove and communicated with a water draining ditch outside the top of the deep foundation pit;
3) The surface layer of the drain pipe 5 is smeared with a cement mortar layer 6 with the same thickness as the reserved interval distance of the foundation cushion layer 8, and the proportion and the mass proportion of the cement mortar are 1:2; backfilling filtering filler around the submersible pump protective housing 3 of the water pit 1 so as to be flush with the submersible pump protective housing 3; laying geotextile 7 on the surface of the filtering filler;
4) The foundation cushion layer 8, the waterproof layer 9, the concrete protection layer 10 and the raft layer are sequentially poured on the surface of the retaining wall and the surface of the anti-seepage cloth on which the drain pipe 5 is installed from bottom to top, and holes of the submersible pump protection shell 3 are reserved, so that the maintenance of the water pump during the construction period before the raft pouring is facilitated;
5) Before a raft foundation is poured, a steel plate pouring local foundation cushion layer is placed on a submerged pump protective shell 3 in a hole, water prevention is completed, a concrete protective layer is poured, the periphery of the hole is consistent with that of the hole, and raft bottom steel bars are welded in a lap joint mode at the reserved hole position to repair the raft bottom steel bars;
6) And (3) the construction is completed by backfilling the raft pouring foundation pit, and drainage is not stopped in the process of backfilling the periphery of the raft pouring and deep foundation pit. Because excessive water accumulation can also exist in the raft pouring process, if conventional drainage measures are taken, the drainage device can be destroyed at the moment, and drainage can not be performed; but the method can continue to drain water, so as to prevent the damage to the cushion layer, the waterproof layer, the protective layer and the raft caused by extrusion due to excessive water pressure.
By adopting the construction steps for construction and drainage, the submerged pump 2 pumps out accumulated water in the water pit and drains the accumulated water into a drainage ditch on the top of the deep foundation pit through the drainage pipe 5. The submerged pump 2 needs to be designed with proper drainage and lift height, the drainage pipe 5 does not penetrate through the foundation cushion layer 8, the waterproof layer 9 and the raft foundation, construction is not disturbed, the problem of waterproof leakage of the raft foundation cannot occur, the construction quality of foundation construction is improved, the difficulty of foundation pit drainage is solved, meanwhile, drainage can be stopped after the raft is poured or after the periphery of the foundation pit is backfilled, in the whole construction operation process, the foundation pit construction is safe and reliable, the quality risk of concrete leakage of the raft foundation is avoided, and the quality is guaranteed.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (2)
1. A construction method of an underground blind well drainage system is characterized in that,
the underground construction blind well drainage system comprises a water collecting pit dug at the lowest part of the deep foundation pit, a water pumping system arranged in the water collecting pit and a drainage ditch dug at the top of the deep foundation pit; the water pumping system comprises a submersible pump, a submersible pump outer cover is provided with a submersible pump protection shell, the height of the submersible pump protection shell is close to the top surface of a water collecting pit, a plurality of water inlets are formed in the lower portion of the side face of the submersible pump protection shell at a certain distance, an outlet is formed in the upper portion of the side face of the submersible pump protection shell, a water drain pipe of the submersible pump is discharged, and an upper cover is arranged on the submersible pump protection shell; the retaining wall around the deep foundation pit is dug with a containing groove for a drain pipe to be paved to the drainage ditch on the top of the deep foundation pit along the retaining wall, and the drain pipe is coated with a layer of cement mortar; the periphery of the submersible pump protective shell of the water collection pit is filled with filtering filler, and impermeable cloth is paved on the filtering filler; the surface of the retaining wall and the surface of the impermeable cloth on which the drain pipe is installed are provided with foundation cushions, the foundation cushions are provided with waterproof layers, and concrete protection layers are arranged on the waterproof layers;
the filtering filler is graded pebbles, the grain diameter of the graded pebbles is not smaller than 20mm, and the periphery of a submersible pump protective shell of the water pit is filled with the graded pebbles;
a filter screen is arranged around the periphery of the water inlet hole of the submerged pump protective shell;
the thickness of the cement mortar layer outside the drain pipe is 50-100mm;
the distance between the submersible pump protective shell and the top surface of the water collection pit is 50-100mm;
the number of the pumping systems is at least 2, and the pumping systems are distributed in the water collection pit;
the water collection pit is inclined at a gradient of 3 degrees;
the drain pipe is a stainless steel hose;
the construction method comprises the following steps:
1) Digging a water collecting pit with a certain depth at the lowest part of the deep foundation pit, and digging a drainage ditch at the top of the deep foundation pit;
2) The water pumping system is arranged at the lowest part of the water collecting pit in a scattered way, a containing groove matched with the pipe diameter of the water draining pipe is dug on the retaining wall surface, the interval distance between the water draining pipe surface and the foundation cushion layer is reserved, and the water draining pipe of the water pumping system is paved outside the retaining wall in the containing groove and is communicated with the water draining ditch on the top of the deep foundation pit;
3) Cement mortar with the same thickness as the reserved interval distance of the foundation mat layer is smeared on the surface layer of the drain pipe; backfilling filtering filler around the submersible pump protective shell of the water collection pit to be flush with the submersible pump protective shell, and paving a layer of impermeable cloth on the surface of the filtering filler;
4) A foundation cushion layer, a waterproof layer, a concrete protection layer and a raft layer are sequentially arranged on the surface of the retaining wall and the surface of the impermeable cloth on which the drain pipe is arranged from bottom to top, and holes of a submersible pump protection shell are reserved;
5) Before a raft foundation is poured, placing a steel plate pouring foundation cushion layer on a submerged pump protective shell in a hole, finishing waterproofing, arranging a protective layer, and overlapping and welding raft bottom reinforcing steel bars at the reserved hole positions to repair the raft bottom reinforcing steel bars;
6) And (3) finishing construction after the raft pouring foundation pit is backfilled, and stopping drainage in the raft pouring and foundation pit backfilling process.
2. The construction method according to claim 1, wherein: the mixing mass ratio of the cement mortar is 1:2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910485713.4A CN110219313B (en) | 2019-06-05 | 2019-06-05 | Drainage system and construction method for underground construction blind well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910485713.4A CN110219313B (en) | 2019-06-05 | 2019-06-05 | Drainage system and construction method for underground construction blind well |
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| Publication Number | Publication Date |
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| CN110219313A CN110219313A (en) | 2019-09-10 |
| CN110219313B true CN110219313B (en) | 2024-01-30 |
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| CN111236283A (en) * | 2020-01-06 | 2020-06-05 | 南通八建集团有限公司 | Local continuous precipitation method for deep foundation pit water collection pit |
| CN112281858A (en) * | 2020-10-20 | 2021-01-29 | 中建八局发展建设有限公司 | Mud rock natural foundation fissure water drainage construction method |
| CN113882415B (en) * | 2021-11-09 | 2023-04-28 | 中国二十冶集团有限公司 | Drainage method |
| CN114575370B (en) * | 2022-04-01 | 2024-04-02 | 北京市第五建筑工程集团有限公司 | High-low span foundation structure and construction method |
| CN115030205B (en) * | 2022-06-07 | 2024-04-26 | 上海城建市政工程（集团）有限公司 | Integrated rapid construction method for raft, water collecting well and elevator shaft of deep foundation pit |
| CN115288173A (en) * | 2022-09-13 | 2022-11-04 | 中国五冶集团有限公司 | Foundation pit drainage system and method |
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