CN216920366U - One-level ground closes on to construct foundation ditch support of structure and groundwater control structure - Google Patents
One-level ground closes on to construct foundation ditch support of structure and groundwater control structure Download PDFInfo
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- CN216920366U CN216920366U CN202220309776.1U CN202220309776U CN216920366U CN 216920366 U CN216920366 U CN 216920366U CN 202220309776 U CN202220309776 U CN 202220309776U CN 216920366 U CN216920366 U CN 216920366U
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- foundation pit
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- occlusion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/406—Aquifer recharge
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Abstract
The utility model provides a one-level rank closes on to build structure excavation supporting and groundwater control structure which characterized in that: comprises an occlusion supporting pile arranged on the side wall of a foundation pit; the top of the occlusion supporting pile is provided with a reinforced concrete crown beam; the reinforced concrete crown beam is connected with a first layer of reinforced concrete support arranged on the same horizontal plane; the waist of the occlusion supporting pile is provided with a reinforced concrete waist beam; the reinforced concrete waist beam is connected with a second layer of reinforced concrete support arranged on the same horizontal plane; setting bottom sealing plain concrete at the bottom of the foundation pit; a pumping system is arranged inside the foundation pit, and a recharge water system is arranged outside the foundation pit. The supporting form of the occlusive supporting pile and the reinforced concrete support is combined with plain concrete bottom sealing, so that the side wall of the foundation pit can be prevented from leaking water, and the confined water surge at the bottom of the pit can be prevented. The drainage system arranged inside the foundation pit and the water return and irrigation system arranged outside the foundation pit can greatly shorten the precipitation time and reduce the influence of precipitation on the periphery.
Description
Technical Field
The utility model relates to the technical field of foundation pit supporting and underground water control of a primary grade approach building structure, in particular to a foundation pit supporting and underground water control structure of a primary grade approach building structure.
Background
Along with the development of urban underground space, the excavation depth of a foundation pit is larger and larger, the problem of sudden inrush at the bottom of the pit caused by underground water is more and more, and the surrounding environment of the foundation pit is more and more complex. Particularly in the first-class places of Yangtze river, abundant confined water is often present. Therefore, the important problems to be solved by the foundation pit support are underground water control and deformation control of surrounding building structures. By adopting the traditional row pile supporting measures, gaps among piles are not easy to block, and water leakage often occurs; although the problem of water leakage among piles can be solved by adopting the cement soil mixing wall internally-inserted profile steel for supporting, the supporting structure has low strength and the foundation pit deformation is often large; by adopting the support measures of the underground continuous wall, the support structure has high strength and good water-resisting property, but has higher cost and longer construction period.
Common foundation pit underground water control methods mainly comprise three methods of water isolation, pressure reduction and bottom sealing. The water isolation is to arrange a water isolation curtain outside the foundation pit, enter a water-tight layer and drain water in the pit, and the method has high cost and great construction difficulty, and particularly when the aquifer is thick, the construction quality is difficult to ensure; the pressure reduction is to arrange a dewatering well, so that the elevation of the pressure-bearing water head at the bottom of the pit is reduced, the dewatering time is long, and the influence on surrounding buildings is large; the bottom sealing is to resist the floating force of the confined water by adopting the pressure-weight modes of mixing piles or plain concrete, and the method can not reduce water or reduce water and has little influence on surrounding buildings.
When the foundation pit is large in scale and important building structures and complex hydrogeological conditions exist at the periphery, a mode of combining multiple measures is adopted for carrying out foundation pit support and underground water control.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a foundation pit supporting and underground water control structure of a first-level ground proximity building, aiming at overcoming the defects of the prior art, and the foundation pit supporting and underground water control structure can strictly control the deformation of the foundation pit in the proximity building area and the underground water rich area, shorten the precipitation time, reduce the influence on the surrounding environment and ensure the safety, economy and high efficiency of engineering construction.
The utility model is realized by the following technical scheme:
the utility model provides a one-level rank closes on to build structure excavation supporting and groundwater control structure which characterized in that: the foundation pit supporting structure comprises occlusion supporting piles arranged on the side wall of the foundation pit; the top of the occlusion supporting pile is provided with a reinforced concrete crown beam; the reinforced concrete crown beam is connected with a first layer of reinforced concrete support arranged on the same horizontal plane; the waist of the occlusion supporting pile is provided with a reinforced concrete waist beam; the reinforced concrete waist beam is connected with a second layer of reinforced concrete support arranged on the same horizontal plane; bottom sealing plain concrete is arranged at the bottom of the foundation pit; a pumping system is arranged inside the foundation pit, and a recharging system is arranged outside the foundation pit.
Furthermore, the occlusion support pile is formed by occlusion of a plurality of equal-diameter equal-length reinforced concrete cast-in-place piles and plain concrete cast-in-place piles; the reinforced concrete cast-in-place piles and the plain concrete cast-in-place piles are arranged at equal intervals along the side wall of the foundation pit.
Furthermore, a seam is arranged at the joint of the bottom sealing plain concrete and the occlusion support pile.
Further, the height of the top surface of the bottom-sealed plain concrete is lower than that of the anti-floating pile at the bottom of the foundation pit.
Furthermore, the pumping system comprises a submersible pump arranged in the foundation pit, and also comprises a dewatering well and a downhole submersible pump which are arranged in the soil body below the bottom of the foundation pit.
Furthermore, the recharge water system comprises a recharge well and a recharge water pump which are arranged in the soil body outside the foundation pit.
Compared with the prior art, the utility model has the following advantages and positive effects:
1. the supporting mode of the occlusion supporting piles and the reinforced concrete supports is combined with plain concrete bottom sealing, so that the water leakage of the side wall of the foundation pit can be prevented, and the pressure bearing water of the pit bottom can be prevented from surging.
2. Excavation to the bottom of the foundation ditch with water, then begin precipitation in the foundation ditch and the water of reinjecting outside the foundation ditch, treat that the bottom sealing concrete stops precipitation in the foundation ditch after reaching design intensity, can shorten the precipitation time greatly, adopt the mode of reinjecting water to the soil body outside the foundation ditch simultaneously, guarantee to close on the safety of building the structure.
3. The supporting structure has high strength, convenient construction and low precipitation cost, and ensures the safety and economy of foundation pit engineering.
Drawings
Fig. 1 is a schematic cross-sectional view of a primary-level ground proximity structure foundation pit supporting and ground water control structure according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of a cast-in-place pile according to an embodiment of the present invention.
Fig. 3 is a schematic view of the connection of prime concrete and a cast-in-place pile according to an embodiment of the utility model.
In the figure: 1-foundation pit, 2-occlusion supporting pile, 2.1-reinforced concrete cast-in-place pile, 2.2-plain concrete cast-in-place pile, 3-reinforced concrete crown beam, 4-first layer reinforced concrete support, 5-reinforced concrete waist beam, 6-second layer reinforced concrete support, 7-bottom sealing plain concrete, 8-anti-floating pile, 9-joint, 10-submersible pump, 11-dewatering well, 12-underground submersible pump, 13-recharging well and 14-recharging water pump.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 to 3, a primary grade near-construction structure foundation pit supporting and underground water control structure comprises occlusion supporting piles 2 arranged on the side wall of a foundation pit 1; the top of the occlusion supporting pile 2 is provided with a reinforced concrete crown beam 3; the reinforced concrete crown beam 3 is connected with a first layer of reinforced concrete support 4 arranged on the same horizontal plane; the waist of the occlusion supporting pile 2 is provided with a reinforced concrete waist beam 5; the reinforced concrete wale 5 is connected with a second layer of reinforced concrete support 6 arranged on the same horizontal plane; the bottom of the foundation pit 1 is provided with a bottom sealing plain concrete 7; a pumping system is arranged inside the foundation pit 1, and a recharging system is arranged outside the foundation pit 1.
The occlusion supporting pile 2 is formed by occlusion of a plurality of equal-diameter equal-length reinforced concrete cast-in-place piles 2.1 and plain concrete cast-in-place piles 2.2; the reinforced concrete cast-in-place piles 2.1 and the plain concrete cast-in-place piles 2.2 are arranged at equal intervals along the side wall of the foundation pit 1. Interlock fender pile 2 can prevent that the foundation ditch lateral wall from leaking, and reinforced concrete bored concrete pile 2.1 and plain concrete bored concrete pile 2.2 interlock setting can be when guaranteeing that the foundation ditch lateral wall is stable reduce cost.
And the bottom sealing plain concrete 7 is arranged at the bottom of the foundation pit 1, a joint 9 is arranged at the joint of the bottom sealing plain concrete 7 and the surrounding occlusion supporting pile 2, and the joint 9 can ensure that the bottom sealing plain concrete 7 is tightly connected with the occlusion supporting pile 2. Chiseling and cleaning concrete of a pile body of the occlusion support pile 2 in the range of the joint 9, and pouring bottom sealing plain concrete 7; the bottom of the foundation pit 1 is also provided with an anti-floating pile 8, the anti-floating pile 8 is a cast-in-place pile, penetrates through the middle of the bottom-sealed plain concrete 7, and protrudes out of the bottom-sealed plain concrete 7 for a certain distance so as to be anchored into a main structure bottom plate.
The pumping system comprises a submersible pump 10 arranged in the foundation pit 1, a dewatering well 11 arranged in the soil below the bottom of the foundation pit 1 and a downhole submersible pump 12. The recharging water system comprises a recharging well 13 and a recharging water pump 14 which are arranged in the soil body outside the foundation pit 1.
The reinforced concrete supports and the occlusion support piles form integral stress, so that the deformation of the foundation pit can be reduced. The occlusion supporting pile 2 is combined with the bottom sealing plain concrete 7 to form five-side enclosure of the foundation pit, so that the side wall of the foundation pit can be isolated from water leakage, and the pressure bearing water at the bottom of the pit can be prevented from surging. The method is characterized in that water is not drained in the excavation process of the foundation pit, the submersible pump 10 in the foundation pit and the submersible pump 12 in the dewatering well are started before the bottom-sealing plain concrete is poured, the water return pump 14 outside the foundation pit is started for recharging, the dewatering well submersible pump is closed after the bottom-sealing plain concrete reaches the designed strength, dewatering time can be greatly shortened, and meanwhile the influence of dewatering on the periphery can be reduced.
The reinforced concrete cast-in-place pile 2.1, the plain concrete cast-in-place pile 2.2, the reinforced concrete crown beam 3, the first layer of reinforced concrete support 4, the reinforced concrete waist beam 5, the second layer of reinforced concrete support 6, the bottom-sealing plain concrete 7 and the anti-floating pile 8 are all cast in place by adopting C30 concrete.
The using method of the utility model comprises the following steps:
clearing and leveling the site: constructing the occlusive supporting pile 2 and the anti-floating pile 8.
Constructing a dewatering well 11 and a recharging well 13, and installing a downhole submersible pump 12 and a recharging water pump 14.
And thirdly, excavating earth to the elevation of the bottom of the first layer of reinforced concrete support 4, constructing the reinforced concrete crown beam 3 and the first layer of reinforced concrete support 4, and anchoring the reinforcing steel bars and synchronously pouring for construction.
Fourthly, after the first layer of reinforced concrete support 4 reaches 80% of design strength, earth is continuously excavated to the elevation of the bottom surface of the second layer of reinforced concrete support 6, the reinforced concrete waist beam 5 and the second layer of reinforced concrete support 6 are constructed, and reinforcing steel bars are mutually anchored and synchronously poured for construction.
And fifthly, after the second layer of reinforced concrete support 6 reaches 80% of design strength, excavating the earthwork underwater to the elevation of the bottom of the foundation pit 1 without draining water.
And sixthly, starting a submersible pump 10 inside the foundation pit 1, a downhole submersible pump 12 and a recharging water pump 14 outside the foundation pit 1, draining the water seepage inside the foundation pit 1 and reducing the underground water level to 1m below the bottom elevation of the foundation pit 1.
And seventhly, finishing the bottom surface of the foundation pit 1, chiseling 8 pile heads of the anti-floating pile, removing mud skins on the surface of the occlusion supporting pile 2, chiseling concrete of the pile body of the occlusion supporting pile 2 in the range of the joint 9, pouring bottom sealing element concrete 7, and stopping precipitation in the foundation pit 1 when the bottom sealing element concrete 7 reaches 100% of the designed strength.
And constructing an underground main structure from bottom to top, and after the underground main structure reaches 100% of design strength, sequentially dismantling the first layer of reinforced concrete support 4 and the second layer of reinforced concrete support 6 to finish backfilling the foundation pit 1.
And ninthly, chiseling the reinforced concrete crown beam 3, closing the recharge water pump 14, sealing the recharge well 13 and restoring the level of the field.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (6)
1. The utility model provides a one-level rank closes on to build structure excavation supporting and groundwater control structure which characterized in that: comprises an occlusion supporting pile (2) arranged on the side wall of the foundation pit (1); the top of the occlusion supporting pile (2) is provided with a reinforced concrete crown beam (3); the reinforced concrete crown beam (3) is connected with a first layer of reinforced concrete support (4) arranged on the same horizontal plane; the waist of the occlusion supporting pile (2) is provided with a reinforced concrete waist beam (5); the reinforced concrete waist beam (5) is connected with a second layer of reinforced concrete support (6) arranged on the same horizontal plane; the bottom of the foundation pit (1) is provided with a bottom sealing plain concrete (7); a water pumping system is arranged inside the foundation pit (1), and a water recharging system is arranged outside the foundation pit (1).
2. The primary grade is close to building structures excavation supporting and ground water control structure of claim 1, characterized in that: the occlusion supporting pile (2) is formed by occlusion of a plurality of equal-diameter equal-length reinforced concrete cast-in-place piles (2.1) and plain concrete cast-in-place piles (2.2); the reinforced concrete cast-in-place piles (2.1) and the plain concrete cast-in-place piles (2.2) are arranged at equal intervals along the side wall of the foundation pit (1).
3. The primary grade is close to building structures excavation supporting and ground water control structure of claim 1, characterized in that: and a joint seam (9) is arranged at the joint of the bottom sealing plain concrete (7) and the occlusion support pile (2).
4. The primary grade is close to and is built structure underground water supporting and ground water control structure of structure excavation according to claim 3, characterized in that: the top surface of the bottom sealing plain concrete (7) is lower than the height of the anti-floating pile (8) at the bottom of the foundation pit.
5. The primary grade is close to building structures excavation supporting and ground water control structure of claim 1, characterized in that: the water pumping system comprises a submersible pump (10) arranged in the foundation pit (1) under water, and further comprises a dewatering well (11) and a downhole submersible pump (12) which are arranged in the soil below the bottom of the foundation pit (1).
6. The primary grade is close to and is built structure underground water supporting and ground water control structure of structure foundation ditch of claim 1, characterized in that: the recharge water system comprises a recharge well (13) and a recharge water pump (14) which are arranged in the soil body outside the foundation pit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220309776.1U CN216920366U (en) | 2022-02-16 | 2022-02-16 | One-level ground closes on to construct foundation ditch support of structure and groundwater control structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220309776.1U CN216920366U (en) | 2022-02-16 | 2022-02-16 | One-level ground closes on to construct foundation ditch support of structure and groundwater control structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216920366U true CN216920366U (en) | 2022-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220309776.1U Active CN216920366U (en) | 2022-02-16 | 2022-02-16 | One-level ground closes on to construct foundation ditch support of structure and groundwater control structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216920366U (en) |
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2022
- 2022-02-16 CN CN202220309776.1U patent/CN216920366U/en active Active
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