Cooperative anti-floating structure based on double-row piles and uplift piles
By designing a coordinated anti-floating structure based on double-row piles and anti-pull piles, the problem that the support structure of the double-row piles in deep foundation pit cannot fully play its anti-pull role is solved, and the anti-floating stability and safety of the underground structure is improved, and the advantages of low-carbon green construction are provided.
Patent Information
- Application Number
- CN202421349902.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-14
AI Technical Summary
In the prior art, the double-row pile support structure of deep foundation pit is regarded as a temporary structure, and its anti-pull effect is not fully exerted, resulting in insufficient anti-floating ability of the underground structure. At the same time, the coordinated anti-floating mechanism and connection structure of double-row piles and anti-pull piles have not been fully studied.
By designing a coordinated anti-floating structure based on double-row piles and anti-pull piles, including rear piles, front piles and anti-pull piles, the front piles are located between the rear piles and anti-pull piles, and the double-row pile crown beam is connected with the side wall of the underground structure with high strength, the coordinated anti-floating effect between the double-row piles and anti-pull piles is realized.
This design not only makes full use of the pull-up resistance of double-row piles to enhance the anti-floating stability of the underground structure, but also saves costs, achieves low-carbon green construction, and improves the safety of the underground structure.
Smart Images
Figure CN222685556U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground structure design and construction, and in particular to a cooperative anti-floating structure based on double-row piles and anti-pulling piles. Background Art
[0002] Some deep and large foundation pit projects have strict requirements on the deformation control of foundation pit support structures and neighboring buildings and structures. In order to obtain a support structure with stronger restraint, a double-row pile support structure was developed based on the single-row pile support structure. The double-row pile support structure is mainly composed of front-row piles, rear-row piles, pile top crown beams and connecting beams. It can also be regarded as a spatial structure system formed by transferring part of the single-row piles to the rear row under the condition that the total number of piles remains unchanged, forming two rows of parallel piles in the front and rear rows, and connecting them at the top of the piles through several connecting beams. The double-row pile support structure is developed from the single-row pile support structure. Compared with the single-row pile, this support structure has good force performance, large horizontal stiffness, strong anti-overturning ability, and less impact on the surrounding existing buildings and structures. However, the construction cost of the double-row piles has increased significantly, and after the main structure in the foundation pit is completed, this temporary support structure has completed its corresponding function, resulting in waste. In order to give full play to the role of the double-row pile support structure throughout its entire life cycle, the applicant has found through practical research that integrating the double-row pile support structure with the underground structure and the pull-out pile unit to exert their synergistic anti-floating effect can greatly improve the anti-floating stability of the underground structure.
[0003] However, at present, the double-row pile support structure of deep foundation pits in underground projects is often identified as a temporary support structure, and its residual value is not fully utilized. There is no relevant research on how double-row piles and pull-out piles can cooperate to resist floating, and the connection structure between the two. The following technical problems are urgently needed in the market: (A). How to solve the synergistic anti-floating effect of double-row piles and pull-out piles, determine the structural position of double-row piles to provide anti-floating reaction force, and achieve the purpose of improving the anti-floating capacity of underground structures; (B). The connection structure between the side wall of the underground structure and the top crown beam of the double-row piles must meet the requirements of seamless, anti-seepage and high-strength connection. Utility Model Content
[0004] In view of the above technical problems in the related art, the utility model proposes a cooperative anti-floating structure based on double-row piles and anti-pullout piles, which can overcome the above deficiencies of the prior art.
[0005] In order to achieve the above technical objectives, the technical solution of the utility model is implemented as follows:
[0006] The utility model relates to a cooperative anti-floating structure based on double-row piles and anti-pulling piles, including a rear-row pile, a front-row pile and an anti-pulling pile unit, wherein the anti-pulling pile unit includes a plurality of anti-pulling piles, and the front-row piles are located between the rear-row piles and the anti-pulling pile unit; the tops of the rear-row piles and the front-row piles are jointly provided with a double-row pile top crown beam, the top of the anti-pulling pile unit is provided with an underground structure bottom plate, and the underground structure bottom plate is provided with an underground structure side wall on one side adjacent to the top of the front-row piles, and one end of the upper part of the mutually adjacent underground structure side walls is fixedly connected to one end of the double-row pile top crown beam. During implementation, the fixed connection method of the underground structure side wall and the double-row pile top crown beam can be implemented by using existing technology, or can be implemented by using the preferred technical solution below this design.
[0007] Preferably, a grouting area is provided inside the top crown beam of the double-row piles, and at least one grouting sleeve is provided in the grouting area, and the grouting sleeve is welded to the steel bars of the top crown beam of the double-row piles; and high-strength grouting liquid is injected into the grouting area.
[0008] Preferably, a plurality of threaded steel bars are connected between the double-row pile top crown beam and the underground structure side wall; one end of each threaded steel bar is welded to the steel bar of the underground structure side wall and the other end is inserted into a corresponding grouting sleeve.
[0009] Preferably, a plurality of reinforcing longitudinal bars are further provided on the upper portion of the side wall of the underground structure, and the reinforcing longitudinal bars are welded to the threaded steel bars.
[0010] Preferably, the double-row pile crown beam is provided with a grouting hole communicated with the grouting sleeve.
[0011] Preferably, the double-row pile top crown beam is provided with a grouting hole communicated with the grouting sleeve.
[0012] Preferably, the grouting holes and the grouting outlet holes preferably lead from the top of the double-row pile crown beam to the grouting sleeve.
[0013] Preferably, the top and bottom parts of the rear row of piles are flush with those of the front row of piles.
[0014] Preferably, the bottom height of the front row of piles is higher than the bottom height of the anti-pulling piles.
[0015] Preferably, the top and bottom parts of all the anti-pulling piles are flush.
[0016] Preferably, the side walls of the underground structure and the adjacent sides of the front row of piles are in close contact with or connected to each other.
[0017] Preferably, the side wall of the underground structure is connected to the front row of piles via steel bars.
[0018] Preferably, the anti-pullout pile unit preferably includes at least two or more anti-pullout piles.
[0019] The beneficial effects achieved by this design are: This design has a simple structure and is easy to maintain. It can not only fully utilize the anti-pullout effect of the double-row piles to enhance the anti-floating stability of the underground structure; it can also fully utilize the role of the double-row piles in the foundation pit support structure to improve the anti-floating ability of the underground structure, thereby enhancing the safety of the underground structure.
[0020] This design firstly sets a connecting structure between the side wall of the underground structure and the top crown beam of the double-row piles. The synergistic effect of the double-row piles and the pull-out piles can improve the anti-floating ability of the underground structure and enhance the anti-floating safety reserve of the underground structure. Secondly, by using the double-row piles of the foundation pit as a temporary supporting structure, the pull-out effect of the double-row piles of the foundation pit supporting structure is fully utilized, saving costs and realizing low-carbon green construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The utility model is further described in detail below with reference to the accompanying drawings.
[0022] Figure 1 It is a cross-sectional view of the arrangement of the cooperative anti-floating structure based on double-row piles and anti-pulling piles described in the utility model.
[0023] In the figure: 1. Double-row pile crown beam; 2. Rear row piles; 3. Front row piles; 4. Pull-out piles; 5. Underground structure bottom plate; 6. Underground structure side wall; 7. Threaded steel bars; 8. Grouting casing; 9. Grouting holes; 10. Grouting holes; 11. Strengthening longitudinal bars; 12. Grouting area. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.
[0025] like Figure 1 As shown, in order to facilitate understanding of the above technical solution of the present invention, the above technical solution of the present invention is described in detail below through specific usage methods.
[0026] In specific use, the cooperative anti-floating structure based on double-row piles and anti-pulling piles described in the utility model includes a rear row of piles 2, a front row of piles 3 and an anti-pulling pile unit, the anti-pulling pile unit includes a plurality of anti-pulling piles 4, and the front row of piles 3 is located between the rear row of piles 2 and the anti-pulling pile unit; the tops of the rear row of piles 2 and the front row of piles 3 are jointly provided with a double-row pile top crown beam 1, the top of the anti-pulling pile unit is provided with an underground structure bottom plate 5, and the underground structure bottom plate 5 is provided with an underground structure side wall 6 on one side adjacent to the top of the front row of piles 3, and one end of the upper part of the mutually adjacent underground structure side walls 6 is fixedly connected to one end of the double-row pile top crown beam 1. During implementation, the fixed connection method of the underground structure side wall 6 and the double-row pile top crown beam 1 can be implemented by using existing technology, or can be implemented by using the preferred technical solution below this design.
[0027] In a specific embodiment, a grouting area 12 is provided inside the double-row pile top crown beam 1 , and at least one grouting sleeve 8 is provided in the grouting area 12 . The grouting sleeve 8 is welded to the steel bars of the double-row pile top crown beam 1 ; high-strength grouting liquid is injected into the grouting area 12 .
[0028] In a specific embodiment, a plurality of threaded steel bars 7 are connected between the double-row pile top crown beam 1 and the underground structure side wall 6 ; one end of each threaded steel bar 7 is welded to the steel bar of the underground structure side wall 6 and the other end is inserted into a corresponding grouting sleeve 8 .
[0029] In a specific embodiment, a plurality of reinforcing longitudinal bars 11 are further provided on the upper portion of the underground structure side wall 6 , and the reinforcing longitudinal bars 11 are welded to the threaded steel bars 7 .
[0030] In a specific embodiment, the double-row pile crown beam 1 is provided with a grouting hole 9 connected to the grouting sleeve 8 .
[0031] In a specific embodiment, the double-row pile crown beam 1 is provided with a grouting hole 10 connected to the grouting sleeve 8 .
[0032] In a specific embodiment, the grouting holes 9 and the grouting holes 10 preferably lead from the top of the double-row pile crown beam 1 to the grouting sleeve 8.
[0033] In a specific embodiment, the top and bottom of the rear row of piles 2 and the front row of piles 3 are flush.
[0034] In a specific embodiment, the bottom height of the front row piles 3 is higher than the bottom height of the anti-pulling piles 4 .
[0035] In a specific embodiment, the tops and bottoms of all the anti-pulling piles 4 are flush.
[0036] In a specific embodiment, the underground structure side wall 6 and the adjacent sides of the front row of piles 3 are closely attached to or connected to each other.
[0037] In a specific embodiment, the underground structure side wall 6 and the front row of piles 3 are preferably connected by steel bars.
[0038] In a specific embodiment, the anti-pullout pile unit preferably includes at least two or more anti-pullout piles 4 .
[0039] In a specific embodiment, the top of the underground structure side wall 6 relative to the top of the double-row pile top crown beam 1 can be higher than the top of the double-row pile top crown beam 1, or the two can be flush.
[0040] Specific working principle: The double-row piles in the foundation pit were originally temporary supporting structures. In order to make full use of the surplus value of the double-row piles, this design closely connects the top crown beam 1 of the double-row piles with the side wall 6 of the underground structure, so as to achieve the purpose of coordinated anti-floating with the base plate 5 of the underground structure and the pull-out piles 4. In order to ensure the seamless, anti-seepage and high-strength connection between the top crown beam 1 of the double-row piles and the side wall 6 of the underground structure, a plurality of grouting sleeves 8 can be pre-buried in the top crown beam 1 of the double-row piles. When the side wall 6 of the underground structure is constructed, the threaded steel bar 7 (the specification can be φ30-φ32) is inserted into the corresponding grouting sleeve 8 and welded with the steel bars and the reinforcing longitudinal bars 11 of the side wall 6 of the underground structure, and then high-strength slurry is injected into the grouting sleeve 8, so as to achieve the purpose of seamless, anti-seepage and high-strength connection.
[0041] Specific construction steps: excavate the foundation pit to the double-row pile construction working surface, construct the rear row of piles 2 and the front row of piles 3 of the double-row piles, and construct the pull-out piles 4. After the strength meets the requirements, remove the pile heads of the double-row piles and construct the double-row pile top crown beams 1. Pre-embed the grouting sleeves 8 in the double-row pile top crown beams 1, and weld the grouting sleeves 8 to the steel bars of the double-row pile top crown beams 1. The grouting sleeves 8 can be equipped with grouting holes 9 or grouting holes 10. After the strength of the double-row pile top crown beams 1 meets the requirements, continue to excavate the foundation pit to the bottom of the pit. Remove the pile heads of the pull-out piles 4, and construct the underground structure bottom plate 5. Insert the threaded steel bars 7 into the corresponding grouting sleeves 8, weld the exposed sections of the threaded steel bars 7, the steel bars of the underground structure side walls 6, and the reinforced longitudinal bars 11, and then continue to cast the underground structure side walls 6. Inject high-strength grouting liquid from the grouting hole 9 to fill the grouting area 12 until it overflows from the grouting hole 10. The double-row piles (rear row piles 2 and front row piles 3) and the pull-out piles 4 cooperate with the anti-floating structure to complete the construction. Figure 1 The related structures of the cooperative anti-floating structure.
[0042] To sum up, this design adopts the above-mentioned unique design. This design has a simple structure and is easy to maintain. It can not only make full use of the anti-pullout effect of the double-row piles to enhance the anti-floating stability of the underground structure; it can also give full play to the role of the double-row piles of the foundation pit support structure to improve the anti-floating ability of the underground structure, thereby enhancing the safety of the underground structure.
[0043] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
Claims
1. A cooperative anti-floating structure based on double-row piles and anti-pulling piles, characterized in that: The invention comprises a rear row of piles (2), a front row of piles (3) and an anti-pulling pile unit, wherein the anti-pulling pile unit comprises a plurality of anti-pulling piles (4), and the front row of piles (3) are located between the rear row of piles (2) and the anti-pulling pile unit; a double-row pile top crown beam (1) is provided on the top of the rear row of piles (2) and the front row of piles (3); an underground structure bottom plate (5) is provided on the top of the anti-pulling pile unit; an underground structure side wall (6) is provided on one side of the underground structure bottom plate (5) adjacent to the top of the front row of piles (3); and one end of the upper part of the mutually adjacent underground structure side walls (6) is fixedly connected to one end of the double-row pile top crown beam (1).
2. The cooperative anti-floating structure according to claim 1, characterized in that: A grouting area (12) is provided inside the double-row pile top crown beam (1), at least one grouting sleeve (8) is provided in the grouting area (12), and the grouting sleeve (8) is welded to the steel bars of the double-row pile top crown beam (1); and high-strength grouting liquid is injected into the grouting area (12).
3. The cooperative anti-floating structure according to claim 2, characterized in that: A plurality of threaded steel bars (7) are connected between the double-row pile top crown beam (1) and the underground structure side wall (6); one end of each threaded steel bar (7) is welded to the steel bar of the underground structure side wall (6) and the other end is inserted into a corresponding grouting sleeve (8).
4. The cooperative anti-floating structure according to claim 3, characterized in that: A plurality of reinforcing longitudinal bars (11) are also provided on the upper part of the underground structure side wall (6), and the reinforcing longitudinal bars (11) are welded to the threaded steel bars (7).
5. The cooperative anti-floating structure according to claim 2, characterized in that: The double-row pile top crown beam (1) is provided with a grouting hole (9) connected to the grouting sleeve (8), and the double-row pile top crown beam (1) is provided with a grouting outlet hole (10) connected to the grouting sleeve (8).
6. The cooperative anti-floating structure according to claim 1, characterized in that: The top and bottom of the rear row piles (2) and the front row piles (3) are flush.
7. The cooperative anti-floating structure according to claim 1, characterized in that: The top and bottom of all the anti-pulling piles (4) are flush with each other.
8. The cooperative anti-floating structure according to claim 1, characterized in that: The underground structure side wall (6) is connected to the adjacent sides of the front row of piles (3).
9. The cooperative anti-floating structure according to claim 8, characterized in that: The underground structure side wall (6) is connected to the front row of piles (3) via steel bars.