CN211621638U - Foundation pit dewatering and drainage system suitable for binary geological structure layer - Google Patents
Foundation pit dewatering and drainage system suitable for binary geological structure layer Download PDFInfo
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- CN211621638U CN211621638U CN201922412599.0U CN201922412599U CN211621638U CN 211621638 U CN211621638 U CN 211621638U CN 201922412599 U CN201922412599 U CN 201922412599U CN 211621638 U CN211621638 U CN 211621638U
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- 230000008595 infiltration Effects 0.000 claims abstract description 21
- 238000001764 infiltration Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- 239000002689 soil Substances 0.000 claims description 17
- 238000001556 precipitation Methods 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 14
- 239000004677 Nylon Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 14
- 238000010276 construction Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 239000004927 clay Substances 0.000 description 8
- 238000009412 basement excavation Methods 0.000 description 6
- 239000003673 groundwater Substances 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000009189 diving Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model discloses a drainage system falls in foundation ditch suitable for binary geological structure layer, drainage system falls in foundation ditch includes the foundation ditch, the foundation ditch all around with interior segmentation be equipped with a plurality of strip infiltration ditch, the all around edge outside of foundation ditch is equipped with the immersible pump of a plurality of downcast pipe well and cooperation downcast pipe well, inside downcast pipe well and/or the light-duty well point of being equipped with of foundation ditch. The utility model provides a binary geological structure dewatering difficulty, the difficult technological problem of drenching.
Description
Technical Field
The utility model relates to a foundation ditch precipitation technical field among the geotechnical engineering, concretely relates to drainage system falls in foundation ditch suitable for binary geological structure layer.
Background
In the foundation pit construction of the ground water level buried depth of the constructed site higher than the excavation depth of the foundation pit, foundation pit dewatering is required during both the excavation of the foundation pit and the foundation construction. The method for dewatering the foundation pit is various, and at present, the commonly used methods mainly comprise large-diameter pipe well dewatering, light well point dewatering, water collection and surface drainage and the like; however, in a field with a special binary structure geological condition that the upper part is silty clay with poor water permeability and the lower part is a sand layer with strong water permeability, the whole water inflow of a foundation pit is large, the water permeability of a water-resisting layer at the upper part is poor, the water content of a soil body is large, and the drainage is very difficult. The large-caliber pipe well can effectively reduce the head height of underground water in a lower sand layer and drain the diving and micro confined water in the sand layer, but is influenced by water isolation and water blocking of an upper water isolation layer, the upper layer of stagnant water or diving in a pit is difficult to flow into the pipe well, the water is often dropped for a long time, the dynamic water level in the large-caliber pipe well is very low, even the situation that the water in the well is not enough for pumping the water pump occurs, but the draining effect on the soil body in the foundation pit cannot be achieved in a delayed manner; the light well point can reduce the water content of the shallow soil body to a certain extent, but the water pumping amount, the depth reducing range and the depth reducing amplitude are limited, and the effect of reducing water in micro-bearing water in a lower sand layer cannot be achieved; the water collection and surface drainage is to lead water gushing in the pit to a part which does not influence the foundation construction through a water collection ditch and a water collection pit and drain the water to a place far away from the foundation pit by a water pump or a water drainage ditch; the method is generally used for projects with hard foundation soil layers, high bearing capacity (such as bedrock, hard cohesive soil, gravelly soil and the like) and low requirement on underground water control in construction, and the aim of dewatering and dewatering can not be achieved due to the fact that soil of the soil layers is soft and water collection and open drainage can not be achieved. Therefore, the above methods cannot achieve ideal precipitation effect for the complex geological conditions with binary structures. Moreover, the efficiency and the effect of foundation pit dewatering are main factors for restricting the construction progress and the safety of the foundation pit, and the overall benefit of the engineering can be influenced in severe cases.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a drainage system falls in foundation ditch suitable for binary geological structure layer to solve the foundation ditch and be located water proof stratum, the drainage difficulty falls for the binary geological structure of the stratum that permeates water by force in foundation ditch lower part, the difficult technical problem who dredges.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the design is a foundation pit dewatering and drainage system suitable for a binary geological structure layer, which comprises a foundation pit, a plurality of strip-shaped seepage ditches arranged in the periphery and the middle area of the foundation pit, a plurality of dewatering tube wells arranged on the outer side of the edge of the foundation pit and/or the periphery of the strip-shaped seepage ditches, and a plurality of dewatering tube wells and/or light well points arranged in the strip-shaped seepage ditches, wherein corresponding submersible pumps are arranged in the dewatering tube wells or the light well points.
Preferably, the length of the strip-shaped infiltration ditch is 10-15 m, the width of the strip-shaped infiltration ditch is 0.5-0.8 m, and the depth of the strip-shaped infiltration ditch penetrates through a water-resisting layer and/or a weak permeable layer on the upper portion of a corresponding soil body and enters a sand layer on the lower portion by 1.0-2.0 m.
Preferably, water-permeable fine sand is arranged in the infiltration ditch.
Preferably, the downcomer wells are arranged at intervals of 15.0-20.0 m, and the depth of each downcomer well is 2.0-3.0 m below the foundation pit base.
Further, be equipped with the internal diameter in the precipitation well and be 300mm sand-free concrete pipe, the parcel has 2 ~ 3 layers of 80 ~ 120 mesh nylon filter screen on its outer wall.
Preferably, the light well points are arranged in the corresponding strip-shaped seepage trenches at intervals of 0.8-1.2 m, and the depth of each light well point is 1.0-2.0 m below the foundation pit base.
Furthermore, the water filter pipes in the light well points are PVC pipes with the pipe diameter D40mm, the pipe wall of the lower section 1/3 of the water filter pipes is provided with holes with the diameter of 4-6 mm and the distance of 150-200 mm, and the outer walls of the PVC pipes and/or the welding seam steel pipes are wrapped with nylon nets.
Preferably, the submersible pump in each downcomer well or light well is arranged 2-3 m away from the bottom of the well.
Compared with the prior art, the utility model discloses a main beneficial technological effect lies in:
1. the utility model discloses a well point (precipitation tube well and/or light-duty well point) + compound foundation ditch dewatering method of infiltration ditch, its upper layer stagnant water and the diving of water barrier lower part or the water conservancy contact of little confined water on having linked up water barrier upper portion in the vertical direction, the water proof that can effectively solve the water barrier, the scheduling problem that blocks water volume of drinking water is big, has increased substantially the efficiency and the effect of foundation ditch dewatering, has shortened construction period.
2. The utility model discloses a light-duty well point and/or precipitation tubular well have improved the original stratum of groundwater in the foundation ditch and have blocked water, the infiltration passageway that the water permeability is poor, and it infiltrates into the perpendicular infiltration to incline with the upper water level of remaining water, makes the function of foundation ditch precipitation reach maximum performance, has increaseed the work efficiency and the effect of dredgeing of well point or tubular well.
3. The utility model adopts the seepage ditch to cut off the horizontal supply channel from the groundwater outside the pit to the inside of the pit, so that the groundwater outside the pit within a certain depth range flows into the seepage ditch and is pumped and discharged to the outside of the foundation pit, and can not be supplied into the foundation pit; the infiltration ditch communicates the hydraulic connection between the upper part and the lower part of the water-proof stratum, so that the upper submerged part or the upper layer stagnant water can smoothly seep after the height of the underground water head is reduced, and the effect of quickly draining the underground water is achieved.
4. The utility model discloses set up the degree of depth of reasonable light-duty well point and tube well, can be satisfying under the prerequisite of foundation ditch effect of driping down, practiced thrift the energy extravagant, increased economic benefits.
Drawings
Fig. 1 is the utility model discloses foundation ditch excavation initial stage section precipitation schematic diagram.
Fig. 2 is the utility model discloses foundation ditch excavation mid-term section precipitation schematic diagram.
Fig. 3 is the utility model discloses profile precipitation schematic diagram at last stage of foundation pit excavation.
Fig. 4 is a partially enlarged view of a portion a in fig. 2.
Fig. 5 is the system plane layout diagram of the foundation pit dewatering and drainage of the utility model.
In the figure, 1 is a natural surface, 2 is a miscellaneous fill layer, 3 is a natural underground water line, 4 is a water-resisting layer, 5 is a weak permeable layer, 6 is a permeable layer, 7 is a submersible pump, 8 is a precipitation pipe well, 9 is a seepage ditch, 10 is a light well point, 11 is a fluctuation water level after precipitation, 12 is a preset base, 13 is a foundation pit boundary, 131 is a foundation pit inner boundary line, and 132 is a foundation pit outer boundary line.
Detailed Description
The following embodiments are only intended to illustrate the present invention in detail, and do not limit the scope of the present invention in any way.
Example 1: the utility model provides a drainage system falls in foundation ditch suitable for binary geological structure layer, refer to fig. 1-5, drainage system falls in foundation ditch includes from the top down runs through water proof stratum and the strong sand bed that permeates water, foundation ditch border and basement, the foundation ditch is equipped with a plurality of length 10 ~ 15m, the width is 0.5 ~ 0.8m strip infiltration ditch all around with interior segmentation, the degree of depth of infiltration ditch passes upper portion water barrier or the weak permeable bed and gets into lower part sand bed 1.0 ~ 2.0m, the infiltration ditch is filled with fine sand, the periphery edge outside of foundation ditch is equipped with a plurality of downcast well and the immersible pump that cooperates the downcast well, the inside downcast well and/or the light well point of being equipped with of foundation ditch. The foundation pit boundary comprises a foundation pit inner boundary line and a foundation pit outer boundary line, and the downcomer wells are arranged on the periphery of the outer side of the foundation pit outer boundary line of the foundation pit and the periphery of the infiltration ditch.
Be equipped with the internal diameter in the downcomer well and be 300mm sand-free concrete strainer, the interval between the downcomer well is 15.0 ~ 20.0m, downcomer well depth to predetermineeing basement lower part 2.0 ~ 3.0m, predetermine the basement for the foundation ditch bottom when digging to required degree of depth, the parcel has 80 ~ 120 mesh nylon filter screen 2 ~ 3 layers on the strainer outer wall, the immersible pump is installed at the position apart from the shaft bottom 2 ~ 3m of downcomer well. The water filter pipe of the light well point is a PVC pipe with a pipe diameter D40mm, holes with a diameter of 4-6 mm and a distance of 150-200 mm are arranged on the pipe wall of the lower section 1/3 of the water filter pipe, a nylon net wraps the outer wall of the PVC pipe and/or the welding seam steel pipe, the distance of the light well point is 0.8-1.2 m, and the depth of the light well point is 1.0-2.0 m to the lower part of the substrate.
The operation and use method of the foundation pit drainage system of the binary geological structure layer comprises the following steps: and (3) opening the submersible pump and the vacuum pump, continuously reducing the underground water level in the foundation pit construction area along with drainage, and continuously and deeply digging the foundation pit to the preset base depth after the underground water level in the range is reduced to 2m below the preset foundation pit depth, and removing the light well point and the dewatering pipe well in the foundation pit.
Example of effects: the project is 10 months in 2018, the project of the center 5 plots of the Lusenberg is located at the northwest corner of the intersection of the loop in Longhu of the New zone of Zhengdong, Zhengzhou city and Ruyi West road, and the depth of the part foundation pit of 2 layers of underground rooms can reach 10.3 m. The geological section of the foundation pit of the construction mark section is shown in figure 1 and sequentially comprises a miscellaneous soil layer, a powdery clay layer, a powdery clay layer and a sand layer from top to bottom, wherein a substrate falls on the powdery clay layer, the lower part of the substrate is the sand layer, and a dynamic water level line is arranged in the sand layer. Calculating the electricity charge and the cost according to the Luxembourg center 5 plot engineering example; the shear strength and the bearing capacity value of the soil body are measured by a soil engineering test.
Originally, a single tube well dewatering mode is adopted, 28-hole dewatering wells are arranged, the single tube well dewatering method is used for 60 days, the underwater in the upper layer of stagnant water and silty clay cannot be drained, the shear strength index of the silty soil layer (phi =16.0 degrees, C =11.0 kPa), the bearing capacity characteristic value 85kPa, the shear strength index of the silty clay (phi =7.0 degrees, C =15.0 kPa) and the bearing capacity characteristic value 75kPa are adopted. Due to the large water content of silt and silty clay, the construction of excavation and transportation of earthwork cannot be smoothly carried out in late time.
And finally, stopping all dewatering wells, and fully demonstrating a reasonable, scientific and effective dewatering scheme by recovering the ground water level of the site to the original state. After the method for lowering the water level of the composite foundation pit of the well point (pipe well, light well point) and the infiltration trench in the embodiment 1 is changed, the water level lowering effect is achieved in 6 days, the shear strength index of the silt soil body (phi =19.2 degrees, C =13.2 kPa) is improved by 20%, the characteristic value of the bearing capacity is 110.5kPa, the index is improved by 20%, the shear strength index of the silty clay (phi =9.1 degrees, C =19.3 kPa), the characteristic value of the bearing capacity is 97.5kPa, and the characteristic value is improved by 30%. The precipitation period is saved by about 45 days, the daily precipitation electric charge is 4500 yuan, and the total electric charge is 202500 yuan.
In general, the composite foundation pit dewatering method eliminates the restriction of special geological conditions through related measures of the construction process, and achieves the engineering effect of quickly finishing the dewatering of the foundation pit; the effects of dewatering and draining can be achieved within a short time, the period of dewatering of the foundation pit is greatly shortened, the water and electricity cost and manual work shifts are saved, and the smooth completion of the overall construction period target of the project is effectively ensured; meanwhile, the dewatering effect is good, soil bodies in the foundation pit and around the foundation pit are promoted to be rapidly solidified again after the water content is reduced, the shear strength and the bearing capacity index of the soil bodies are improved by 20-30%, and the safety of the foundation pit supporting structure is effectively guaranteed.
The present invention has been described in detail with reference to the accompanying drawings and embodiments, but those skilled in the art will understand that various specific parameters in the above embodiments can be changed without departing from the spirit of the present invention to form a plurality of specific embodiments, which are the common variation ranges of the present invention and will not be described in detail herein.
Claims (8)
1. The utility model provides a drainage system falls in foundation ditch suitable for binary geological structure layer which characterized in that, includes the foundation ditch, sets up in this foundation ditch a plurality of strip infiltration ditches of all around and middle part region, follows a plurality of downpipe well that foundation ditch edge outside and/or strip infiltration ditch set up all around, and be in a plurality of downpipe well and/or light well point that set up in the strip infiltration ditch, and be provided with corresponding immersible pump in each downpipe well or light well point.
2. The system of claim 1, wherein the system comprises: the length of the strip-shaped infiltration ditch is 10-15 m, the width of the strip-shaped infiltration ditch is 0.5-0.8 m, and the depth of the strip-shaped infiltration ditch penetrates through a water-resisting layer and/or a weak permeable layer at the upper part of a corresponding soil body and enters a sand layer at the lower part by 1.0-2.0 m.
3. The system of claim 1, wherein the system comprises: and a permeable fine sand layer is arranged in the infiltration ditch.
4. The system of claim 1, wherein the system comprises: the downcomer wells are arranged at intervals of 15.0-20.0 m, and the depth of each downcomer well is 2.0-3.0 m below the foundation pit base.
5. The system of claim 4, wherein the system comprises: be equipped with the internal diameter for 300mm sand-free concrete pipe in the precipitation well, it has 2 ~ 3 layers of 80 ~ 120 mesh nylon filter screen to wrap up on its outer wall.
6. The system of claim 1, wherein the system comprises: the light well points are arranged in the corresponding strip-shaped seepage trenches at intervals of 0.8-1.2 m, and the depth of the light well points is 1.0-2.0 m below the foundation pit base.
7. The system of claim 6, wherein the system comprises: the water filter pipe in the light well point is a PVC pipe with a pipe diameter D40mm, holes with a diameter of 4-6 mm and a distance of 150-200 mm are arranged on the pipe wall of the lower section 1/3 of the water filter pipe, and a nylon net is wrapped on the outer wall of the PVC pipe and/or the outer wall of the welding seam steel pipe.
8. The system of claim 1, wherein the system comprises: and the submersible pump in each downcomer well or light well is arranged 2-3 m away from the bottom of the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922412599.0U CN211621638U (en) | 2019-12-29 | 2019-12-29 | Foundation pit dewatering and drainage system suitable for binary geological structure layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922412599.0U CN211621638U (en) | 2019-12-29 | 2019-12-29 | Foundation pit dewatering and drainage system suitable for binary geological structure layer |
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| Publication Number | Publication Date |
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| CN211621638U true CN211621638U (en) | 2020-10-02 |
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| CN201922412599.0U Expired - Fee Related CN211621638U (en) | 2019-12-29 | 2019-12-29 | Foundation pit dewatering and drainage system suitable for binary geological structure layer |
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- 2019-12-29 CN CN201922412599.0U patent/CN211621638U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201002 |