CN219364639U - Deep foundation pit supporting system combining double-row piles and jet grouting piles - Google Patents
Deep foundation pit supporting system combining double-row piles and jet grouting piles Download PDFInfo
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- CN219364639U CN219364639U CN202320534556.3U CN202320534556U CN219364639U CN 219364639 U CN219364639 U CN 219364639U CN 202320534556 U CN202320534556 U CN 202320534556U CN 219364639 U CN219364639 U CN 219364639U
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Abstract
The utility model discloses a deep foundation pit supporting system combining double-row piles and jet grouting piles, which comprises a plurality of first row piles, a plurality of second row piles, a first jet grouting pile group, a second jet grouting pile group and a third jet grouting pile group. The first row of piles, the second row of piles and the first jet grouting pile group are arranged outside the foundation pit, and the third jet grouting pile group and the second jet grouting pile group are arranged in the foundation pit; the three jet grouting piles are arranged in a quincuncial manner; the tops of the two groups of pile-beating tops are connected through a crown beam, and the tops of the third jet grouting pile groups closest to the middle of the foundation pit are arranged in a step-shaped manner. The utility model can be implemented in deep and large foundation pit support with complicated geological conditions, and has good application prospect in the complex deep and large foundation pit support engineering with the surrounding existing building (construction) environment.
Description
Technical Field
The utility model relates to the field of foundation pit support, in particular to a deep foundation pit support system combining double-row piles and jet grouting piles.
Background
With the development of economy, urban construction and transformation are rapidly developed, and a plurality of ultra-large foundation pits are inevitably generated. The deep foundation pit support is used for ensuring the safety of surrounding environments in the foundation pit excavation construction, the underground structure construction and the construction process, so that corresponding reinforcement, protection and retaining measures are adopted.
However, in the construction of foundation pit in large city, the problems of more complex underground environment and rock-soil conditions, such as insufficient strength of soil body of the site, too large excavation depth of the foundation pit, too high construction cost of support and the like, are often faced. Therefore, a deep foundation pit supporting system combining double-row piles and jet grouting piles is urgently needed to cope with and solve the problems.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a deep foundation pit supporting system combining double-row piles and jet grouting piles, which can be implemented in deep foundation pit supporting with large depth and complicated geological conditions.
In order to achieve the above object, the present utility model provides a deep foundation pit supporting system combining double row piles and jet grouting piles, comprising: a plurality of first row piles, a plurality of second row piles, a first jet grouting pile group, a second jet grouting pile group and a third jet grouting pile group; the first jet grouting pile group, the second jet grouting pile group and the third jet grouting pile group are respectively composed of a plurality of jet grouting piles which are fixed at intervals and are arranged in a quincuncial manner;
further, the first row of piles and the second row of piles are arranged outside the foundation pit and are parallel to the side wall of the foundation pit; the second row of piles is positioned on one side, away from the side wall of the foundation pit, of the first row of piles; the first jet grouting pile group is arranged around the first row of piles and the second row of piles; the tops of the plurality of first row piles are connected through first crown beams; the tops of the second row of piles are connected through a second crown beam; one side of the first row of piles extends out of the side wall of the foundation pit; two adjacent first rows of piles are connected through a soil retaining plate; the soil retaining plate is abutted with the side wall of the foundation pit;
further, the second jet grouting pile group and the third jet grouting pile group are arranged in the foundation pit; one side of the second jet grouting pile group is close to the side wall of the foundation pit, and the lengths of a plurality of jet grouting piles in the second jet grouting pile group are the same; one side of the third jet grouting pile group is close to the other side of the second jet grouting pile group; the jet grouting piles in the third jet grouting pile group are arranged in a step-shaped manner, and the lengths of the jet grouting piles close to the second jet grouting pile group are longer than those of the jet grouting piles far away from the second jet grouting pile group; and the top surface of the third jet grouting pile group is poured with a concrete structure surface.
Further, the first row of piles and the second row of piles are correspondingly arranged; the first row of piles and the corresponding second row of piles are connected through connecting beams.
Further, a plurality of drill holes are formed in the ground surface in the foundation pit; the second jet grouting pile group and a plurality of jet grouting piles in the third jet grouting pile group correspondingly extend into a plurality of drilled holes; and a certain distance exists between the tops of the second jet grouting pile group and the third jet grouting pile group and the drilling hole.
Further, the top surface of the first jet grouting pile group is flush with the ground outside the foundation pit.
Further, the top end of the soil retaining plate is fixedly connected with the first crown beam, and the bottom end of the soil retaining plate stretches into the position of 0.5m of the soil layer in the foundation pit.
Further, the first row of piles, the second row of piles, the jet grouting piles, the soil retaining plate and the connecting beam are all reinforced concrete structures.
The utility model discloses the following technical effects:
compared with the prior art, the deep foundation pit supporting system combining the double-row piles and the jet grouting piles can be implemented in deep foundation pit supporting with large depth and complicated geological conditions, and the jet grouting pile groups are arranged in front of and behind the double-row piles, so that the functions of improving the soil structure and improving the physical and mechanical parameters of the soil can be achieved. And the arrangement of the internal rotation spraying pile groups and the overhead piles of the rotary spraying pile groups in the foundation pit with different elevation forms can be adjusted in a grading manner according to the excavation depth and the excavation surface of the foundation pit, so that the resistance action of soil bodies in front of double-row pile piles is improved, the utilization rate of underground space of the foundation pit is made to be larger as much as possible, and meanwhile, the construction cost of foundation pit support is reduced. Meanwhile, the integral deformation of the foundation pit is well controlled, and the method has good application prospect in complex deep and large foundation pit supporting engineering with the surrounding existing building environment.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top plan view of the structural arrangement of the present utility model;
FIG. 2 is a side view of the structural arrangement of the present utility model;
FIG. 3 is a schematic representation of a first row of pile plate connections according to the present utility model;
FIG. 4 is a schematic representation of a first row of piles connected to a first crown beam in accordance with the present utility model;
1, a first row of piles; 2. a second row of piles; 3. a soil retaining plate; 4. a first crown bar; 5. a second crown bar; 6. a connecting beam; 7. a third jet grouting pile group; 8. a second jet grouting pile group; 9. a first jet grouting pile group; 10. a concrete structural surface; 11. pile vertical steel bars; 12. vertical steel bars of the retaining plate; 13. transverse reinforcing steel bars of the retaining plate; 14. drilling.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-4, the present utility model provides a deep foundation pit support system combining double row piles and jet grouting piles, comprising: a plurality of first row piles 1, a plurality of second row piles 2, a first jet grouting pile group 9, a second jet grouting pile group 8 and a third jet grouting pile group 7; the first jet grouting pile group 9, the second jet grouting pile group 8 and the third jet grouting pile group 7 are respectively composed of a plurality of jet grouting piles which are fixed at intervals and are arranged in a quincuncial manner;
in one embodiment of the utility model, the first row of piles 1 and the second row of piles 2 are arranged outside the foundation pit and are parallel to the side wall of the foundation pit; the second row of piles 2 is positioned on one side of the first row of piles 1, which is far away from the side wall of the foundation pit; the first jet grouting pile group 9 is arranged around the first row of piles 1 and the second row of piles 2; the tops of the first row of piles 1 are connected through a first crown beam 4; the tops of the second rows of piles 2 are connected through second crown beams 5; one side of the first row of piles 1 extends out of the side wall of the foundation pit; two adjacent first rows of piles 1 are connected through a soil retaining plate 3; the retaining plate 3 is abutted with the side wall of the foundation pit;
in one embodiment of the utility model, the second set of jet grouting piles 8 and the third set of jet grouting piles 7 are arranged in the foundation pit; one side of the second jet grouting pile group 8 is close to the side wall of the foundation pit, and the lengths of a plurality of jet grouting piles in the second jet grouting pile group 8 are the same; one side of the third jet grouting pile group 7 is close to the other side of the second jet grouting pile group 8; the jet grouting piles in the third jet grouting pile group 7 are arranged in a step shape, and the length of the jet grouting pile close to the second jet grouting pile group 8 is longer than that of the jet grouting pile far away from the second jet grouting pile group 8; the top surface of the third jet grouting pile group 7 is poured with a concrete structure surface 10.
In one embodiment of the utility model, a plurality of first row piles 1 and a plurality of second row piles 2 are correspondingly arranged; the first row of piles 1 and the corresponding second row of piles 2 are connected through connecting beams 6.
In one embodiment of the utility model, a plurality of drill holes 14 are formed in the ground surface in the foundation pit; the second jet grouting pile group 8 and a plurality of jet grouting piles in the third jet grouting pile group 7 correspondingly extend into a plurality of drilling holes 14; there is a distance between the tops of the second set of jet grouting piles 8 and the third set of jet grouting piles 7 and the drilling of the borehole 14.
In one embodiment of the utility model, the top surface of the first jet grouting pile group 9 is flush with the ground outside the foundation pit.
In one embodiment of the utility model, the top end of the soil retaining plate 3 is fixedly connected with the first crown beam 4, and the bottom end of the soil retaining plate extends into the soil layer 0.5m in the foundation pit.
In one embodiment of the utility model, the first row of piles 1, the second row of piles 2, the jet grouting piles, the soil retaining plate 3 and the connecting beam 6 are all reinforced concrete structures.
Example 1: the implementation example is an excavation construction supporting project of a deep foundation pit with large geological condition and complex, the foundation pit is adjacent to a building and a planned ground iron wire, a large number of underground pipelines are arranged nearby, the thickness of a soil layer of the field is more than 30 meters, the soil is newly thrown and filled, the soil body compactness is poor, the bearing capacity is lower, and the excavation depth of the foundation pit is 23m.
As shown in fig. 1-2, the pile tops of the first row of piles 1 are connected by a first crown beam 4, the pile tops of the second row of piles 2 are connected by a second crown beam 5, a connecting beam 6 is arranged between the pile tops of the first row of piles 1 and the pile tops of the second row of piles 2, the first row of piles 1 and the second row of piles 2 are arranged in parallel at equal heights, and the first row of piles 1 and the second row of piles 2 are reinforced concrete cast-in-place piles. The soil retaining plate 3 is arranged between two piles of the first row of piles 1, the third rotary spraying pile group 7, the second rotary spraying pile group 8 and the first rotary spraying pile group 9 are arranged around the double row of piles in a quincuncial shape, the third rotary spraying pile group 7 is arranged in a stepped mode with different heights according to a certain slope, and the sprayed concrete structural surface 10 is arranged on the third rotary spraying pile group 7.
Specifically, the pile diameter of the first row of piles 1 and the second row of piles 2 is 2.5m, the pile length is 42m, the embedded section is larger than 28.3m, the pile spacing is fixed to be 4m, the pile top height is lower than the ground elevation outside the foundation pit by 1m, the first crown beam 4 and the second crown beam 5 are respectively arranged between the pile tops of the same row of piles, the crown beam section is rectangular, the height is 1.5m, the width is the same as the pile diameter, the reinforced concrete structure is adopted, the vertical steel bars of the first row of piles 1 and the second row of piles 2 are anchored in the crown beam, the connecting beam 6 is arranged between the two rows of piles, the section of the connecting beam 6 is rectangular, the width is the same as the pile diameter, and the connecting beam 6 and the first row of piles 1, the second row of piles 2, the first crown beam 4 and the second crown beam 5 are integrally cast.
Specifically, as shown in fig. 3, the first row of piles 1 is provided with a soil-retaining plate 3 between the piles, the soil-retaining plate 3 is 300mm thick, the bottom burial depth of the soil-retaining plate 3 is greater than 0.5m below the front soil level of the soil-retaining plate 3, the vertical steel bars 12 of the soil-retaining plate are anchored into the first crown beam 4, the horizontal steel bars 13 of the soil-retaining plate are parallelly lapped and penetrated into the first row of piles 1, tie bars are arranged between the two rows of horizontal steel bars, and the vertical steel bars of the piles are arranged 11 on the periphery of the vertical steel bars 12 of the soil-retaining plate. The first row piles 1 and one side of the soil retaining plate 3 are exposed out of the side wall of the foundation pit and play a role in supporting the side wall of the foundation pit.
Specifically, behind the foundation ditch outside first jet grouting pile group 9 set up in first row stake 1, second row stake 2, first jet grouting pile group 9 carries out quincuncial plane arrangement with 1.5m interval, pile group section quantity is 8, pile top elevation and foundation ditch outside ground elevation unanimity, and the stake footpath is 500mm, and the stake is long 23m, sets up 3 diameter 22mm reinforcing bars in the stake.
Specifically, the second jet grouting pile group 8 in the foundation pit is arranged after the foundation pit is excavated by one step, a plurality of drilling holes 14 are drilled in the excavation surface of the foundation pit, the second jet grouting pile group 8 is inserted into the drilling holes 14, quincuncial arrangement is carried out on the planes of the second jet grouting pile group 8 at intervals of 1.0m, the number of sections of the pile groups is 7, the pile top elevation is lower than the excavated foundation pit surface of 1 step, the drilling holes 14 are reserved between the pile top and the bottom surface of the foundation pit, the pile length of the jet grouting piles and the length of the rest drilling holes 14 are 19m, the pile diameter is 500mm, the length of the rest drilling holes 14 is determined according to the depth of the excavation surface of the foundation pit, and the jet grouting pile top in front of the double-row piles is provided with a 50mm thick sprayed concrete structural surface 10.
Specifically, the third jet grouting pile group 7 in the foundation pit is arranged after the foundation pit is excavated for one stage, the third jet grouting pile group 7 is inserted into the drilled holes 14, quincuncial arrangement is carried out on the plane at intervals of 1.0m, the number of sections of the pile groups is 3, the pile bottoms of the piles of the pile groups are consistent in detail, the pile top heights are arranged at a certain slope rate (1:0.5) from inside to outside in a different height mode, the drilled holes 14 are reserved between the pile top of each corresponding pile and the bottom surface of the foundation pit where the foundation pit is excavated for one stage, the pile length of the jet grouting pile plus the length of the rest drilled holes 14 is 19m, and the pile diameter is 500mm.
Specifically, after the foundation pit is excavated at the second stage, the soil parts of the third jet grouting pile group 7 and the second jet grouting pile group 8, on which the drill holes 14 are reserved, are excavated, the concrete structural surface 10 is arranged on the slope surface with the same slope rate (1:0.5) of the third jet grouting pile group 7, the thickness of the concrete structural surface 10 is 500mm, and the concrete structural surface is formed by spraying C20 concrete.
In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.
Claims (6)
1. The utility model provides a deep basal pit supporting system that double row stake and jet grouting stake combine which characterized in that includes: a plurality of first row piles (1), a plurality of second row piles (2), a first jet grouting pile group (9), a second jet grouting pile group (8) and a third jet grouting pile group (7); the first jet grouting pile group (9), the second jet grouting pile group (8) and the third jet grouting pile group (7) are respectively composed of a plurality of jet grouting piles which are fixed at intervals and are arranged in a quincuncial manner;
the first row of piles (1) and the second row of piles (2) are arranged outside the foundation pit and are parallel to the side wall of the foundation pit; the second row of piles (2) is positioned on one side, far away from the side wall of the foundation pit, of the first row of piles (1); the first jet grouting pile group (9) is arranged around the first row of piles (1) and the second row of piles (2); the tops of the plurality of first row piles (1) are connected through first crown beams (4); the tops of the second row of piles (2) are connected through a second crown beam (5); one side of the first row of piles (1) extends out of the side wall of the foundation pit; two adjacent first rows of piles (1) are connected through a soil retaining plate (3); the soil retaining plate (3) is abutted with the side wall of the foundation pit;
the second jet grouting pile group (8) and the third jet grouting pile group (7) are arranged in the foundation pit; the bottoms of the second jet grouting pile group (8) and the third jet grouting pile group (7) are flush; one side of the second jet grouting pile group (8) is close to the side wall of the foundation pit, and the lengths of a plurality of jet grouting piles of the second jet grouting pile group (8) are the same; one side of the third jet grouting pile group (7) is close to the other side of the second jet grouting pile group (8); the tops of the third jet grouting piles (7) are arranged in a step mode, and the lengths of the jet grouting piles of the third jet grouting piles (7) close to the second jet grouting piles (8) are longer than those of the jet grouting piles far away from the second jet grouting piles (8); and a concrete structural surface (10) is poured on the top surface of the third jet grouting pile group (7).
2. Deep foundation pit supporting system combining double row piles and jet grouting piles according to claim 1, wherein a plurality of first row piles (1) and a plurality of second row piles (2) are correspondingly arranged; the first row of piles (1) and the corresponding second row of piles (2) are connected through connecting beams (6).
3. Deep foundation pit supporting system combining double row piles and jet grouting piles according to claim 1, wherein a plurality of drill holes (14) are formed in the foundation pit; the second jet grouting pile group (8) and a plurality of jet grouting piles in the third jet grouting pile group (7) correspondingly extend into a plurality of drilling holes (14); and a certain distance exists between the tops of the second jet grouting pile group (8) and the third jet grouting pile group (7) and the drilling hole (14).
4. Deep foundation pit support system combining double row piles and jet grouting piles according to claim 1, wherein the top surface of the first jet grouting pile group (9) is flush with the ground outside the foundation pit.
5. The deep foundation pit supporting system combining double piles and jet grouting piles according to claim 1, wherein the top end of the soil retaining plate (3) is fixedly connected with the first crown beam (4), and the bottom end of the soil retaining plate extends into the soil layer 0.5m in the foundation pit.
6. Deep foundation pit supporting system combining double row piles and jet grouting piles according to claim 2, wherein the first row piles (1), the second row piles (2), the jet grouting piles, the retaining plate (3) and the connecting beams (6) are all reinforced concrete structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320534556.3U CN219364639U (en) | 2023-03-17 | 2023-03-17 | Deep foundation pit supporting system combining double-row piles and jet grouting piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320534556.3U CN219364639U (en) | 2023-03-17 | 2023-03-17 | Deep foundation pit supporting system combining double-row piles and jet grouting piles |
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| CN219364639U true CN219364639U (en) | 2023-07-18 |
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| CN202320534556.3U Active CN219364639U (en) | 2023-03-17 | 2023-03-17 | Deep foundation pit supporting system combining double-row piles and jet grouting piles |
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| CN (1) | CN219364639U (en) |
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- 2023-03-17 CN CN202320534556.3U patent/CN219364639U/en active Active
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