CN216142041U - Foundation pit supporting structure next to high-speed rail operation line - Google Patents
Foundation pit supporting structure next to high-speed rail operation line Download PDFInfo
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- CN216142041U CN216142041U CN202121541306.XU CN202121541306U CN216142041U CN 216142041 U CN216142041 U CN 216142041U CN 202121541306 U CN202121541306 U CN 202121541306U CN 216142041 U CN216142041 U CN 216142041U
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Abstract
The utility model provides a foundation pit supporting structure next to a high-speed rail operation line, which comprises a waterproof curtain and a high-pressure jet grouting pile which are arranged along the outer side of the edge of a foundation pit, and a plurality of drilled piles which are arranged along the inner side of the edge of the foundation pit; the waterproof curtain is arranged close to the high-speed rail operation line side, the high-pressure jet grouting piles are arranged far away from the high-speed rail operation line side, the drilling piles are close to the waterproof curtain and the high-pressure jet grouting piles, the foundation reinforcing layer is arranged on the inner side of each drilling pile, and a plurality of dewatering wells are arranged on the inner side edge of the foundation reinforcing layer. The utility model discloses a through the stagnant water curtain that adopts early construction perturbation as the temporary isolation measure, effectively reduce and close on the influence of operation high-speed railway foundation ditch to the high-speed railway during foundation ditch stagnant water curtain, envelope construction to can solve soil body lateral displacement, the vertical influence of subsiding to the high-speed railway that envelope warp and arouse during excavation of foundation ditch and precipitation, combine different protection distance to adopt the envelope form of subregion section simultaneously, can effective control engineering investment.
Description
Technical Field
The utility model belongs to the technical field of foundation pit construction, and particularly relates to a foundation pit supporting structure close to a high-speed rail operation line.
Background
At present, the domestic foundation pit engineering is mainly constructed by an open cut method, the special design needs to be performed on the protected objects in the foundation pit engineering close to the special protected objects such as the side of the high-speed railway operation line, if the design needs to be strengthened on the foundation pit engineering enclosure structure, the safety of facilities such as a roadbed and a structure of the high-speed railway operation line is ensured. The traditional foundation pit engineering generally adopts a triaxial stirring pile, a drilling pile and an underground diaphragm wall as a lateral stress system of the foundation pit engineering, adopts a reinforced concrete support or a steel support as a plane stress system of the foundation pit engineering, simultaneously, the foundation pit engineering also needs to carry out precipitation treatment to drain soil bodies in the pit and then carries out foundation pit excavation due to the existence of underground water, the effectiveness of a foundation pit waterproof curtain directly influences the settlement amount of the soil bodies outside the pit, and further deformation influence is generated on high-speed rail operation line facilities close to the foundation pit. Therefore, how to solve the influence of soil disturbance, foundation pit excavation and precipitation on high-speed rail facilities during the construction of the foundation pit enclosure structure adjacent to the high-speed rail operation line is the problem of primary consideration in the design of the foundation pit enclosure structure, and meanwhile, the height of construction machinery needs to be considered in the selection of the enclosure structure, so that the major operation risk of the large machinery on the high-speed rail operation line after the large machinery is overturned during the construction period is prevented.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a foundation pit supporting structure adjacent to a high-speed rail operation line, which can at least solve part of defects in the construction process of the existing foundation pit supporting structure adjacent to the high-speed rail operation line.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a foundation pit supporting structure next to a high-speed rail operation line comprises a waterproof curtain and high-pressure jet grouting piles arranged along the outer side of the edge of a foundation pit, and a plurality of drilled piles arranged along the inner side of the edge of the foundation pit; the waterproof curtain is arranged close to high-speed rail operation line side, the high-pressure jet grouting pile is arranged far away from the high-speed rail operation line side, the drilling pile is close to the waterproof curtain and the high-pressure jet grouting pile are arranged on the inner side, a foundation reinforcing layer is arranged on the inner side of the drilling pile, is located below a main structure construction station to be constructed and is provided with a plurality of precipitation wells along the inner side edge of the foundation reinforcing layer.
Furthermore, the waterproof curtain comprises a plurality of MJS construction method piles, and two adjacent MJS construction method piles are mutually meshed and lapped together.
Furthermore, the bored piles are large-diameter bored piles and small-diameter bored piles, the large-diameter bored piles are arranged at equal intervals along one side of the foundation pit close to the high-speed rail operation line, the small-diameter bored piles are arranged at equal intervals along the rest sides of the foundation pit, and the diameter and the length of each large-diameter bored pile are larger than those of each small-diameter bored pile.
Furthermore, the high-pressure jet grouting pile is located on the outer side of the small-diameter drilled pile, and the length of the high-pressure jet grouting pile is smaller than that of the small-diameter drilled pile.
Furthermore, the inter-pile jet grouting pile is sleeved between two adjacent drilled piles, and the inter-pile jet grouting pile is in lap joint with two adjacent drilled piles in the foundation pit and a waterproof curtain or a high-pressure jet grouting pile outside the foundation pit.
And further, fine aggregate concrete is poured between two adjacent drilled piles and the rotary jet grouting piles between the two adjacent drilled piles.
Furthermore, the inter-pile rotary jet grouting pile adopts a high-pressure rotary jet grouting pile of a single pipe, a double pipe, a triple pipe, an MJS construction method or an RJP construction method.
Furthermore, the dewatering well comprises a well body and a dewatering well pipe sleeved in the well body, a filter material is filled between the well body and the dewatering well pipe, cohesive soil is filled between the well body above the filter material and close to the ground and the dewatering well pipe, and a plurality of sections of filter pipes are arranged in the dewatering well pipe at intervals along the length direction of the dewatering well pipe.
Furthermore, above-mentioned foundation ditch supporting construction still supports the foundation ditch support between relative bored pile when being used for the foundation ditch excavation to and be used for the foundation ditch when the foundation ditch is built construction again and trade and prop.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the foundation pit supporting structure close to the high-speed rail operation line provided by the utility model can effectively reduce the influence of the foundation pit close to the operation high-speed rail on the high-speed rail during the construction of the foundation pit water-stop curtain and the enclosure structure by adopting the water-stop curtain with micro disturbance of the prior construction as a temporary isolation measure, can solve the influence of the lateral displacement and the vertical settlement of a soil body caused by the deformation of the enclosure structure during the excavation and precipitation of the foundation pit, and can effectively control the engineering investment by adopting the enclosure structure form of the subsection in combination with different protection distances.
(2) The foundation pit supporting structure close to the high-speed rail operation line provided by the utility model does not need to adopt large machinery for construction in the construction process, can effectively prevent the large machinery from overturning the major potential safety hazard to the high-speed rail operation line during construction, and is safe and reliable in construction.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the present invention in close proximity to a high-speed rail operating line in a foundation pit supporting structure;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is an enlarged view of section I of FIG. 1;
FIG. 5 is a schematic view of the dewatering well according to the present invention.
Description of reference numerals: 1. a foundation pit; 2. a waterproof curtain; 3. performing jet grouting among the piles; 4. high-pressure jet grouting piles; 5. a foundation reinforcing layer; 6. dewatering wells; 7. drilling a pile with a small diameter; 8. drilling a pile with a large diameter; 9. supporting a foundation pit; 10. replacing a support of the foundation pit; 11. fine stone concrete; 12. filtering the material; 13. a precipitation well pipe; 14. a filter tube; 15. and (4) cohesive soil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, 2 and 3, the embodiment provides a foundation pit supporting structure adjacent to an operation line of a high-speed rail, which comprises a waterproof curtain 2 and a high-pressure jet grouting pile 4 which are arranged along the outer side of the edge of a foundation pit 1, and a plurality of drilled piles which are arranged along the inner side of the edge of the foundation pit 1; the waterproof curtain 2 is arranged close to high-speed rail operation line side, the high-pressure jet grouting pile 4 is arranged far away from the high-speed rail operation line side, the drilling pile is close to the waterproof curtain 2 and the high-pressure jet grouting pile 4 are arranged on the inner side, a foundation reinforcing layer 5 is arranged on the inner side of the drilling pile, the foundation reinforcing layer 5 is located below a main structure construction station to be constructed, and a plurality of dewatering wells 6 are arranged along the inner side edge of the foundation reinforcing layer 5.
In the embodiment, the waterproof curtain 2 outside the foundation pit 1 can be used as a containment waterproof curtain during the later excavation of the foundation pit 1, and can play a role in isolation during the construction of the fender post, so that the disturbance of the fender post on foundation soil during the construction is effectively reduced, and the influence of the fender post on the surrounding environment during the construction is reduced; meanwhile, in the conventional common enclosure structures such as piles in the SMW construction method, underground continuous walls and other processes, large machinery is generally adopted for hoisting construction, and in order to prevent potential huge risks to the operation of a high-speed rail line due to possible overturning and collapsing during the construction of the large machinery, a bored pile is adopted as a support form of foundation pit enclosure near the high-speed rail operation line in the example; and underground water existing in the foundation pit construction process is subjected to precipitation treatment through the precipitation well 6. The foundation pit supporting structure provided by the embodiment can effectively reduce the influence of the foundation pit close to the operating high-speed rail on the high-speed rail during the construction of the waterproof curtain and the enclosure structure of the foundation pit, and can solve the influence of the lateral displacement and the vertical settlement of the soil body caused by the deformation of the enclosure structure during the excavation and precipitation of the foundation pit on the high-speed rail.
Specifically, because the MJS is a mature construction process, and has the characteristics of small disturbance to the surrounding environment and foundation soil, deep construction depth, good pile-forming engineering quality and the like, the waterproof curtain 2 in the embodiment adopts a plurality of MJS-method piles, and two adjacent MJS-method piles are mutually meshed and overlapped; the foundation ditch is the square in this embodiment, all be under construction this stagnant water curtain 2 in the foundation ditch three sides that are close to high-speed railway operation line, high pressure jet grouting pile 4 of the construction of foundation ditch one side of keeping away from high-speed railway operation line adopts mutual interlock lapped structure equally, play the isolation to later stage fender pile construction through stagnant water curtain 2 and high pressure jet grouting pile 4, effectively reduce the disturbance to foundation soil during the fender pile construction, reduce the influence to the surrounding environment during the fender pile construction.
An optimized implementation mode is adopted, the embodiment combines different protection distances and adopts a sectional enclosure structure form, specifically, the bored piles adopt a mode of combining large-diameter bored piles 8 and small-diameter bored piles 7, the large-diameter bored piles 8 are arranged at equal intervals along one side, close to a high-speed rail operation line, in a foundation pit 1, according to the difference of the depth of the foundation pit 1, the diameter, the interval and the length of the large-diameter bored piles 8 need to be determined after calculation by combining specific soil layer physical and mechanical parameters, hydrological conditions and supporting setting track number and mode, the large-diameter bored piles 8 mainly need to control the influence of the lateral deformation and the vertical deformation of the foundation pit on the peripheral operation high-speed rail line during excavation of the foundation pit 1, and the controlled index is the control value of the high-speed rail operation line; minor diameter bored pile 7 is arranged along all the other equal intervals of side in foundation ditch 1, and minor diameter bored pile 7 also needs to adopt and confirms diameter and interval after the calculation, and what be different with major diameter bored pile 8 is, minor diameter bored pile 7 mainly controls foundation ditch self warp, satisfy corresponding control standard can, through the construction mode that major diameter bored pile 8 and minor diameter bored pile 7 combined together, can effectively save holistic engineering investment. Typically, as shown in fig. 2 and 3, the large diameter bored pile 8 is larger in diameter and length than the small diameter bored pile 7. The length of the waterproof curtain 2 needs to be determined according to different hydrogeological conditions, the main principle is to ensure that an effective waterproof system can be formed in the foundation pit 1, the length of the waterproof curtain 2 generally needs to enter a waterproof layer, and when the foundation pit 1 has the problem of anti-surge, a confined water layer needs to be separated and enter the waterproof layer at the lower part; and the high-pressure jet grouting pile 4 is positioned on the outer side of the small-diameter drilled pile 7, and the length of the high-pressure jet grouting pile 4 is smaller than that of the small-diameter drilled pile 7.
Preferably, as shown in fig. 1 and 4, an inter-pile jet grouting pile 3 is sleeved and driven between two adjacent drilled piles, the inter-pile jet grouting pile 3 is in lap joint with two adjacent drilled piles in the foundation pit 1 and a waterproof curtain 2 or a high-pressure jet grouting pile 4 outside the foundation pit 1, and the effective sealing between the drilled piles and the waterproof curtain 2 is ensured through the structural arrangement of the inter-pile jet grouting pile 3, so that the sealing effectiveness of the whole waterproof curtain 2 is ensured; specifically, the inter-pile jet grouting pile 3 may be a single-pipe, double-pipe, or triple-pipe high-pressure jet grouting pile, or a stronger high-pressure jet grouting pile according to the MJS method or the RJP method. Further, as shown in fig. 4, fine stone concrete 11 is poured between two adjacent drilled piles and the inter-pile jet grouting pile 3, so that the effectiveness of sealing the waterproof curtain is further improved.
Preferably, as shown in fig. 5, the dewatering well 6 includes a well body and a dewatering well pipe 13 sleeved in the well body, a filter material 12 is filled between the well body and the dewatering well pipe 13, a viscous soil 15 is filled between the well body above the filter material 12 and close to the ground and the dewatering well pipe 13, and a plurality of sections of filter pipes 14 are arranged in the dewatering well pipe 13 at intervals along the length direction thereof. The foundation reinforcing layer 5 in the foundation pit can be in various forms, and in consideration of the overturning problem possibly generated when a large-scale machine close to a high-speed rail side is constructed, a triple-pipe high-pressure jet grouting pile is generally adopted, and the forms of MJS, RJP, N-jet and the like can also be adopted.
In addition, in an optimized embodiment, the foundation pit supporting structure further comprises a foundation pit support 9 used for supporting between the opposite bored piles during excavation of the foundation pit 1, and a foundation pit support 10 used for foundation pit 1 rebuilding construction. As shown in fig. 2 and 3, the foundation pit 1 is constructed by open cut, and foundation pit supports 9 are arranged at any time along with the cut, wherein the first foundation pit support 9 is usually made of reinforced concrete support, if the foundation pit 1 is a long strip narrow foundation pit, when the width of the foundation pit 1 is not large, the first foundation pit support 9 can also be made of steel support, and the rest foundation pit supports 9 are comprehensively determined according to the shape, width, length and the like of the foundation pit, and can be made of reinforced concrete support or steel support; and in the foundation pit 1 rebuilding stage, whether the foundation pit support changing 10 needs to be adopted is determined according to the corresponding control value and the calculation result, and the foundation pit support changing 10 generally adopts a steel support.
The concrete construction process of the foundation pit supporting structure adjacent to the high-speed rail operation line is as follows:
(1) constructing a micro-disturbance water-stop curtain 2 at the side close to a high-speed rail operation line, wherein the water-stop curtain 2 adopts micro-disturbance MJS construction method piles, and adjacent MJS construction method piles are mutually meshed and lapped. Specifically, for a square foundation pit, the waterproof curtain is constructed on three sides close to a high-speed rail operating line.
(2) The large-diameter bored pile 8 is constructed by adopting a small machine tool for drilling and pouring near the high-speed rail operation line side, and the small-diameter bored pile 7 is constructed far away from the high-speed rail operation line side. Specifically, as shown in fig. 1, for a square foundation pit, a large-diameter bored pile 8 is constructed on one side adjacent to an operation line of a high-speed rail, and small-diameter bored piles 7 are constructed on the other three sides of the foundation pit.
(3) The inter-pile jet grouting pile 3 is constructed between the waterproof curtain 2 and the large-diameter bored pile 8, and between the waterproof curtain 2 and the small-diameter bored pile 7.
(4) And constructing the high-pressure jet grouting pile 4 outside the small-diameter bored pile 7 far away from the high-speed rail operation line side.
(5) And constructing a foundation reinforcing layer 5 and a dewatering well 6 inside the foundation pit 1.
(6) Constructing each foundation pit support 9 inside the foundation pit 1 from top to bottom step by step, excavating the foundation pit 1, and supporting along with excavation; and constructing a corresponding foundation pit support changing 10 according to the calculation result in the construction stage of the internal structure of the foundation pit 1.
In summary, the foundation pit supporting structure next to the high-speed rail operation line provided by the utility model can effectively reduce the influence of the foundation pit close to the operation high-speed rail on the high-speed rail during the construction of the foundation pit water-stop curtain and the enclosure structure by adopting the water-stop curtain with micro-disturbance in the early construction as a temporary isolation measure, can solve the influence of the lateral displacement and the vertical settlement of a soil body caused by the deformation of the enclosure structure during the excavation and precipitation of the foundation pit on the high-speed rail, and simultaneously adopts the segmented enclosure structure form by combining different protection distances, can effectively control the engineering investment, has the characteristics of safe and reliable construction, simple structure form, effective control on the influence on the surrounding environment and the like, and can be widely applied to various foundation pit projects close to the operation high-speed rail line.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the utility model, which is intended to be covered by the claims and any design similar or equivalent to the scope of the utility model.
Claims (9)
1. A foundation pit supporting structure next to a high-speed rail operation line is characterized by comprising a waterproof curtain and a high-pressure jet grouting pile which are arranged along the outer side of the edge of a foundation pit, and a plurality of drilled piles which are arranged along the inner side of the edge of the foundation pit; the waterproof curtain is arranged close to high-speed rail operation line side, the high-pressure jet grouting pile is arranged far away from the high-speed rail operation line side, the drilling pile is close to the waterproof curtain and the high-pressure jet grouting pile are arranged on the inner side, a foundation reinforcing layer is arranged on the inner side of the drilling pile, is located below a main structure construction station to be constructed and is provided with a plurality of precipitation wells along the inner side edge of the foundation reinforcing layer.
2. A foundation pit supporting structure adjacent to an operation line of a high-speed rail as claimed in claim 1, wherein the waterproof curtain comprises a plurality of MJS-construction piles, and two adjacent MJS-construction piles are engaged and overlapped with each other.
3. The supporting structure of a foundation pit adjacent to an operating line of a high-speed railway according to claim 1, wherein the bored piles are large-diameter bored piles and small-diameter bored piles, the large-diameter bored piles are arranged at equal intervals along one side of the foundation pit adjacent to the operating line of the high-speed railway, the small-diameter bored piles are arranged at equal intervals along the remaining side of the foundation pit, and the large-diameter bored piles have a larger diameter and a larger length than the small-diameter bored piles.
4. A foundation pit supporting structure adjacent to an operating line of a high-speed railway according to claim 3, wherein the high-pressure jet grouting pile is located outside the small-diameter bored pile, and the length of the high-pressure jet grouting pile is smaller than that of the small-diameter bored pile.
5. A foundation pit supporting structure adjacent to an operating line of a high-speed railway according to claim 1 or 3, wherein an inter-pile jet grouting pile is sleeved between two adjacent drilled piles, and the inter-pile jet grouting pile is overlapped with two adjacent drilled piles in the foundation pit and a waterproof curtain or a high-pressure jet grouting pile outside the foundation pit.
6. A supporting structure for a foundation pit adjacent to an operating line of a high-speed railway according to claim 5, wherein fine aggregate concrete is poured between two adjacent bored piles and the inter-pile shotcrete pile.
7. A foundation pit supporting structure adjacent to an operation line of a high-speed railway according to claim 5, wherein the inter-pile jet grouting pile is a high-pressure jet grouting pile of a single pipe, a double pipe, a triple pipe, MJS construction or RJP construction.
8. The foundation pit supporting structure adjacent to the high-speed rail operation line as claimed in claim 1, wherein the precipitation well comprises a well body and a precipitation well pipe sleeved in the well body, a filter material is filled between the well body and the precipitation well pipe, a viscous soil is filled between the well body above the filter material and the precipitation well pipe, and a plurality of sections of filter pipes are arranged in the precipitation well pipe at intervals along the length direction of the precipitation well pipe.
9. A pit supporting structure adjacent to an operating line of a high speed railway as claimed in claim 1, further comprising a pit support for supporting between the opposed bored piles during excavation of the pit, and a pit replacement support for use during construction of the pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541306.XU CN216142041U (en) | 2021-07-08 | 2021-07-08 | Foundation pit supporting structure next to high-speed rail operation line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541306.XU CN216142041U (en) | 2021-07-08 | 2021-07-08 | Foundation pit supporting structure next to high-speed rail operation line |
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| Publication Number | Publication Date |
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| CN216142041U true CN216142041U (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121541306.XU Active CN216142041U (en) | 2021-07-08 | 2021-07-08 | Foundation pit supporting structure next to high-speed rail operation line |
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2021
- 2021-07-08 CN CN202121541306.XU patent/CN216142041U/en active Active
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