CN219450785U - Intelligent precipitation system for open caisson foundation pit - Google Patents
Intelligent precipitation system for open caisson foundation pit Download PDFInfo
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- CN219450785U CN219450785U CN202320489333.XU CN202320489333U CN219450785U CN 219450785 U CN219450785 U CN 219450785U CN 202320489333 U CN202320489333 U CN 202320489333U CN 219450785 U CN219450785 U CN 219450785U
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- open caisson
- steel sleeve
- precipitation
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- permeable steel
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Abstract
The utility model discloses an intelligent precipitation system for an open caisson foundation pit, which comprises a plurality of precipitation wells arranged on the periphery of the open caisson foundation pit, wherein a permeable steel sleeve is inserted into each precipitation well, a broken stone backfill layer is filled between the outer wall of each permeable steel sleeve and the wall of each precipitation well, so that collapse of the wall of each well and clogging of water filtering holes of each permeable steel sleeve are prevented; the submersible pump is connected with a water pumping pipe extending out of the permeable steel sleeve, the submersible pump is connected with a controller through a control cable, and the controller is also connected with the water level detector through the control cable. This open caisson foundation ditch intelligence precipitation system can be according to the automatic drainage precipitation of water level condition, and the drainage precipitation is big, and the peripheral soil body of tube well is difficult to collapse unstably.
Description
Technical Field
The utility model relates to the technical field of foundation pit construction, in particular to an intelligent precipitation system for an open caisson foundation pit.
Background
Open caissons are typically used as a foundation for bridge piers or other structures. The main construction method of the existing open caisson is that a shaft is prefabricated on the ground, then a foundation pit is excavated on the ground, the shaft is suspended into the foundation pit, the shaft can sink to a designed elevation after overcoming the friction resistance of the pit wall of the foundation pit by means of self gravity, and finally the construction of the open caisson is completed through concrete bottom sealing and filling gaps between the shaft and the foundation pit.
In the foundation pit excavation process, when the foundation pit with the elevation of the bottom surface lower than the ground water level is excavated, the ground water can continuously infiltrate into the pit. The underground water is difficult to excavate, the construction is labor-consuming and time-consuming, the side slope is easy to collapse, the foundation is immersed by water, foundation soil is disturbed, uneven settlement of adjacent buildings is caused, and the buildings are cracked or destroyed. Therefore, in the traditional foundation pit excavation construction, measures for reducing the groundwater level are adopted according to engineering geology and groundwater conditions, so that the foundation pit excavation and construction reach a non-water state, and the engineering quality and the smooth progress of the engineering are ensured.
The ground water level is reduced, the water is generally reduced in a pumping and draining mode, and the pumped ground water is discharged outwards through a drainage pipeline. At present, a more pipe well dewatering method is adopted, dewatering wells are arranged at the periphery of a foundation pit for pumping and draining, but if automatic dewatering according to water level is not possible, continuous dewatering with large range and large capacity can cause resource waste, the balance of groundwater in nature is destroyed, and when the stratum is sand layer soil, soil around the pipe well is easy to collapse and unstably due to the lack of supporting effect.
Disclosure of Invention
The utility model aims to provide an intelligent precipitation system for an open caisson foundation pit, which can automatically pump out precipitation according to water level conditions, is large in pumping-out precipitation amount, and is not easy to collapse and unstably for soil bodies around a pipe well.
In order to achieve the purpose of the utility model, the technical scheme adopted is as follows:
the intelligent precipitation system for the open caisson foundation pit comprises a plurality of precipitation wells arranged on the periphery of the open caisson foundation pit, and the number of the precipitation wells is calculated by designing the provided geological water inflow, the precipitation depth of the open caisson foundation pit, the area of the open caisson foundation pit, the water outlet of a single well and other parameters; the submersible pump is connected with a pumping pipe extending out of the permeable steel sleeve, the submersible pump is connected with a controller through a control cable, the controller is also connected with the water level detector through the control cable, the controller is arranged outside a dewatering well, the working water level of the submersible pump is preset according to the construction progress and the sinking elevation of the sinking well, when the water level rises to a specified position, the controller automatically starts pumping water according to a set program and descends to a preset water level, and the controller automatically stops pumping water according to the set program.
Further preferred is: the top of the broken stone backfill layer is filled with a clay backfill layer so as to prevent the infiltration of the surface water.
Further preferred is: the periphery of the dewatering well is provided with a hardening layer, and the hardening layer is poured by concrete.
Further preferred is: the periphery of the open caisson foundation pit is dug with a rectangular drainage ditch, water pumped and discharged by the water pumping pipe is discharged into the rectangular drainage ditch, and the rectangular drainage ditch is kept smooth with a drainage system outside the foundation pit.
Further preferred is: the aperture of the dewatering well is 40cm larger than the pipe diameter of the permeable steel sleeve, and the depth of the dewatering well is more than 5m deeper than the pit of the open caisson base.
Further preferred is: the wall thickness of the permeable steel sleeve is greater than 10mm, the aperture ratio of the permeable hole is greater than 50%, and the aperture of the permeable hole is 0.5-1.5cm.
Further preferred is: the particle size of the broken stone backfill layer is larger than 18mm.
This open caisson foundation ditch intelligence precipitation system opens the immersible pump that stops through setting up controller and water level detector and through the controller control, can be according to construction progress and open caisson subsidence elevation, presets immersible pump working water level, when the water level rises to the assigned position, the controller starts the water pumping according to setting up the procedure voluntarily, descends to predetermined water level, and the controller stops to draw water according to setting up the procedure voluntarily, guarantees that the foundation ditch can be under the construction of dry condition in, is difficult for causing the wasting of resources. The permeable steel sleeve is inserted in the dewatering well, and a broken stone backfill layer is filled between the outer wall of the permeable steel sleeve and the wall of the dewatering well, so that the collapse of the wall of the well and the clogging of the water filtering hole of the permeable steel sleeve can be prevented.
Drawings
FIG. 1 is a schematic diagram of the intelligent precipitation system of the open caisson foundation pit;
FIG. 2 is a plan view of a dewatering well;
FIG. 3 is a cross-sectional view of an arrangement of dewatering wells;
the names corresponding to the serial numbers in the figures are:
1. dewatering well, 2, immersible pump, 3, rubble backfill layer, 4, permeable steel sleeve pipe, 5, clay backfill layer, 6, the hardening layer, 7, rectangular escape canal, 8, the drinking-water pipe, 9, control cable, 10, controller, 11, water level detector, 12, open caisson foundation ditch.
Description of the embodiments
In order to make the technical scheme and advantages of the present application more clear, the technical scheme is clearly and completely described below with reference to the embodiments.
Examples
The intelligent precipitation system for the open caisson foundation pit comprises a plurality of precipitation wells 1 arranged on the periphery of the open caisson foundation pit 12, wherein a permeable steel sleeve 4 is inserted into the precipitation wells 1, a broken stone backfill layer 3 is filled between the outer wall of the permeable steel sleeve 4 and the wall of the precipitation well 1 to prevent collapse of the wall of the well and blockage of water filtering holes of the permeable steel sleeve 4, and a clay backfill layer 5 is filled at the top of the broken stone backfill layer 3 to prevent surface water seepage; the submersible pump 2 and the water level detector 11 are arranged in the permeable steel sleeve 4, the submersible pump 2 is connected with the water pumping pipe 8 extending out of the permeable steel sleeve 4, the submersible pump 2 is connected with the controller 10 through the control cable 9, and the controller 10 is also connected with the water level detector 11 through the control cable 9.
The periphery of the dewatering well 1 is provided with a hardening layer 6.
The periphery of the open caisson foundation pit 12 is dug with a rectangular drainage ditch 7, water pumped and discharged by the water pumping pipe 8 is discharged into the rectangular drainage ditch 7, and the rectangular drainage ditch 7 is kept smooth with a drainage system outside the foundation pit.
The aperture of the dewatering well 1 is 40cm larger than the pipe diameter of the permeable steel sleeve 4, and the depth of the dewatering well 1 is more than 5m deeper than the depth of the open caisson foundation pit 12.
The wall thickness of the permeable steel sleeve 4 is larger than 10mm, the aperture ratio of the permeable holes is larger than 50%, and the aperture of the permeable holes is 0.5-1.5cm.
The particle size of the broken stone backfill layer 3 is larger than 18mm.
Engineering application instance
A separated open caisson foundation is adopted for a certain extra bridge foundation, the size of a south open caisson is 25.4m (longitudinal) ×18m (transverse) ×21m (height), and the size of a north open caisson is 25.4m (longitudinal) ×18m (transverse) ×24m (height). The geological lithology water permeability of the bridge site is artificial filling soil (Qml), fully weathered silicalite (D1 qn) and fully weathered argillite sandstone (D1 qn) are medium water permeability, and the muddy clay (Qal +pl) and the silty clay (Qal +pl) are weak water permeability layers; the joint cracks of the strongly weathered silicalite (D1 qn) and the strongly weathered argillaceous siltstone (D1 qn) develop to form a strongly permeable layer; the calculated water inflow of the foundation pit is 15000m3/d. By adopting the intelligent precipitation construction method for the open caisson foundation pit, precipitation wells with the aperture of 40cm are uniformly arranged along the outer side 5m of the foundation pit, each precipitation well is provided with a submersible pump with the aperture of 150m < 3 >/h, the water level is started and stopped through the system arrangement, the aim that the water level falls to 0.5m below the construction surface is fulfilled, and the guarantee is provided for the smooth sinking of the open caisson.
The above description is not intended to limit the present application to the particular embodiments disclosed, but is not intended to limit the scope of the present application to such modifications, adaptations, additions or substitutions as would be within the spirit and scope of the present application.
Claims (7)
1. The utility model provides an open caisson foundation ditch intelligence precipitation system, includes a plurality of precipitation well (1) that set up at the periphery of open caisson foundation ditch (12), its characterized in that: the dewatering well (1) is internally provided with a permeable steel sleeve (4), and a broken stone backfill layer (3) is filled between the outer wall of the permeable steel sleeve (4) and the well wall of the dewatering well (1); the water permeable steel sleeve (4) is internally provided with a submersible pump (2) and a water level detector (11), the submersible pump (2) is connected with a water pumping pipe (8) extending out of the water permeable steel sleeve (4), the submersible pump (2) is connected with a controller (10) through a control cable (9), and the controller (10) is also connected with the water level detector (11) through the control cable (9).
2. The open caisson pit intelligent precipitation system according to claim 1, wherein: the top of the broken stone backfill layer (3) is filled with a clay backfill layer (5).
3. The open caisson pit intelligent precipitation system according to claim 1, wherein: the periphery of the dewatering well (1) is provided with a hardening layer (6).
4. The open caisson pit intelligent precipitation system according to claim 1, wherein: rectangular drainage ditches (7) are dug at the periphery of the open caisson foundation pit (12).
5. The open caisson pit intelligent precipitation system according to claim 1, wherein: the aperture of the dewatering well (1) is 40cm larger than the pipe diameter of the permeable steel sleeve (4), and the depth of the dewatering well (1) is more than 5m deeper than the depth of the pit (12) of the dewatering well.
6. The open caisson pit intelligent precipitation system according to claim 1 or 5, wherein: the wall thickness of the permeable steel sleeve (4) is more than 10mm, the aperture ratio of the permeable holes is more than 50%, and the aperture of the permeable holes is 0.5-1.5cm.
7. The open caisson pit intelligent precipitation system according to claim 1 or 5, wherein: the particle size of the broken stone backfill layer (3) is larger than 18mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320489333.XU CN219450785U (en) | 2023-03-15 | 2023-03-15 | Intelligent precipitation system for open caisson foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320489333.XU CN219450785U (en) | 2023-03-15 | 2023-03-15 | Intelligent precipitation system for open caisson foundation pit |
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| CN219450785U true CN219450785U (en) | 2023-08-01 |
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| CN202320489333.XU Active CN219450785U (en) | 2023-03-15 | 2023-03-15 | Intelligent precipitation system for open caisson foundation pit |
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- 2023-03-15 CN CN202320489333.XU patent/CN219450785U/en active Active
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