Deep foundation pit pile anchor support structure

Abstract

This application relates to a deep foundation pit pile-anchor support structure, specifically within the technical field of foundation pit support. The deep foundation pit pile-anchor support structure includes support piles, a capping beam, and a first anchor rod. Multiple sets of support piles are arranged at intervals along the edge of the foundation pit, with the capping beam connecting their tops. The first anchor rod is anchored to the sidewall of the foundation pit and connected to the support piles. A connecting beam is provided on the back side of the support piles. The first anchor rod passes sequentially through the support piles and the connecting beam and is locked in place by fasteners. Multiple sets of support beams are spaced apart on the connecting beam near the sidewall of the foundation pit. The two ends of the support beams abut against the sidewalls of adjacent support piles, preventing adjacent support piles from approaching each other. This application, by adding connecting beams and locking them with the first anchor rod, combined with the lateral support effect of the support beams on adjacent support piles, significantly enhances the constraint and overall coordination of the middle of the support piles, reduces the probability of bending deformation of the support piles, and improves the stability of the deep foundation pit pile-anchor support structure.

Description

Technical Field

[0001] This application relates to the technical field of foundation pit support, and in particular to deep foundation pit pile anchor support structures. Background Technology

[0002] Traditional deep foundation pit pile-anchor support structures mainly consist of reinforced concrete support piles, pile top capping beams, and anchor rods. The support piles are arranged at intervals, the capping beams are cast-in-place to connect the tops of multiple support piles, and the anchor rods are anchored into the soil of the foundation pit sidewall.

[0003] The current construction plan involves drilling and casting retaining piles on the excavation surface beforehand. A capping beam is then cast atop multiple sets of retaining piles to connect them into a single unit. Next, the excavation begins. As the excavation depth increases, anchor bolts are drilled into the pit sidewalls through the retaining piles. The anchor bolts are inclined at an angle of 15°-30° to the pit sidewalls, securing them to the retaining piles and providing a force that moves the piles closer to the pit sidewalls. This ensures the retaining piles provide support to the pit sidewalls. As the excavation depth increases, anchor bolts are installed at intervals to maintain the support force of the retaining piles to the pit sidewalls.

[0004] However, as the foundation pit is excavated, although the tops of adjacent support piles are connected and fixed by capping beams and the bottoms are supported and fixed by unexcavated soil, as the depth of the foundation pit increases, the soil between adjacent support piles falls, and the middle of the pile body lacks effective ties. Under the action of soil pressure, it is easy to generate independent deformation, resulting in insufficient integrity of the support system and poor coordination between support piles. At the same time, the capping beam is mainly subjected to bending, and has limited restraint on the lateral displacement of the middle of the pile body. Especially in soft soil foundation pits, it is easy to cause the pile body to tilt, reducing the lateral displacement resistance of the pile anchor support. Utility Model Content

[0005] In order to reduce the probability of bending deformation of the support piles and improve the stability of the deep foundation pit pile anchor support structure, this application provides a deep foundation pit pile anchor support structure.

[0006] The deep foundation pit pile anchor support structure provided in this application adopts the following technical solution:

[0007] A deep foundation pit pile-anchor support structure includes support piles, a capping beam, and a first anchor rod. Multiple sets of support piles are arranged at intervals along the edge of the foundation pit. The capping beam is set on top of each support pile and is used to connect multiple sets of support piles. The first anchor rod is anchored on the sidewall of the foundation pit and connected to the support piles. A connecting beam is provided on the side of the support pile away from the sidewall of the foundation pit. The first anchor rod passes through the support pile and the connecting beam in sequence and is locked and fixed by a fastener. Multiple sets of support beams are arranged at intervals along the length of the connecting beam on the sidewall of the connecting beam close to the sidewall of the foundation pit. The two ends of the support beams abut against the sidewall of adjacent support piles and are used to prevent adjacent sets of support piles from getting close to each other.

[0008] By adopting the above technical solution, a connecting beam is added to the back side of the support pile. Then, the first anchor rod passes through the support pile and the connecting beam and is locked with a fastener. At the same time, multiple sets of support beams are set on the side of the connecting beam near the foundation pit and at the interval between adjacent support piles. The two ends of the support beams are pressed against the sidewalls of the adjacent support piles to directly resist the tendency of the adjacent support piles to move closer to each other. Meanwhile, the connecting beam, support beams and the first anchor are fixed to form a whole, which reduces the probability of bending deformation of the support pile and improves the stability of the deep foundation pit pile anchor support structure.

[0009] Furthermore, a second anchor rod is anchored on the pit sidewall corresponding to the middle of the support beam. The second anchor rod passes through the support beam and the connecting beam in sequence and pulls the support beam and the connecting beam to move closer to the pit sidewall.

[0010] By adopting the above technical solution, the second anchor rod applies a tensile force to the connecting beam and the supporting beam toward the pit side, thereby causing the supporting beam and connecting beam system to actively press against the soil and offset part of the soil pressure on the support pile.

[0011] Furthermore, the support beam has an arc-shaped structure, and the force exerted by the second anchor on the support beam is used to drive the support beam to move in the straightening direction.

[0012] By adopting the above technical solution, the arc-shaped support beam absorbs energy during the straightening process, converts the tension of the second anchor rod into radial support force, buffers the impact of sudden soil pressure, and at the same time ensures that the support beam always exerts a certain force on the adjacent support piles, reducing the probability of the support piles deforming close to each other.

[0013] Furthermore, multiple sets of connecting beams and support beams are spaced apart along the length of the support piles, and the multiple sets of support beams between adjacent support piles are mutually supported and connected by X-shaped support frames.

[0014] By adopting the above technical solution, the X-shaped support frame connects the multi-layer support beams into a three-dimensional truss, eliminating the defects of the single-layer weak surface of traditional support, while realizing full-depth constraint of the pile body and suppressing the overturning moment caused by deep soil excavation.

[0015] Furthermore, the support frame is anchored to the side wall of the pit at the intersection of the middle section and the bottom section by a third anchor rod.

[0016] By adopting the above technical solution, the third anchor rod directly transfers the force of the support frame to the soil in the foundation pit, avoiding the stress from relying entirely on the support piles, achieving double anchoring, and improving the stability of the support structure.

[0017] Furthermore, the cross-section of the connecting beam is an I-shaped steel structure, and the supporting beam is a steel plate that can undergo bending deformation.

[0018] By adopting the above technical solution, the I-beam structure reduces the self-weight of the connecting beam under the same bending strength, while the flexible deformation structure of the support beam allows the connecting beam to press against the arc-shaped support beam when it moves closer to the side wall of the foundation pit, thereby improving the clamping effect of the support beam on the adjacent support piles.

[0019] Furthermore, the support beam has a bent portion on the side near the support pile, and a locking groove is provided on the side wall of the support pile. The bent portion is pressed against the locking groove and locked onto the support pile by a locking member.

[0020] By adopting the above technical solution, the bent part is clamped in the clamping groove and locked by the locking device, thereby realizing the multi-dimensional force transmission, while allowing the support pile to deform slightly without falling off, thus improving the clamping and fixing effect of the support beam on the support pile.

[0021] Furthermore, the connecting beam is provided with an extension plate, which is provided on the upper and lower sides of the connecting beam and is used to prevent the support beam from sliding along the length direction of the support pile. The extension plates on opposite sides of adjacent connecting beams are fixedly connected by a support frame.

[0022] By adopting the above technical solution, the extension plate forms a constrained space, which allows the support beam to bend and deform while constraining the vertical degree of freedom. At the same time, the support frame improves the stability between the extension plates on opposite sides of adjacent connecting beams, ultimately ensuring the accurate direction of the support force of the support beam on the retaining pile.

[0023] Furthermore, multiple sets of fixing rods are provided on the side of the extension plate near the pit sidewall, and the fixing rods are inserted into the pit sidewall.

[0024] By adopting the above technical solution, the extension plate is fixed to the side wall of the foundation pit by inserting a fixing rod on the side of the foundation pit. The fixing rod acts as a micro-pulling pile, which increases the overturning resistance of the support structure.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] A connecting beam is added on the side of the foundation pit away from the support piles, and the connecting beam and support piles are anchored to the foundation pit sidewall by the first anchor rod. The arc-shaped support beam set on the connecting beam supports and fixes the two adjacent support piles, thereby reducing the probability of deformation between adjacent support piles. At the same time, the connecting beam, support beam and first anchor fixation form a whole. In conjunction with the layered X-shaped support frame, multiple support beams are connected in series to form a spatial constraint system, which reduces the probability of bending deformation of the support piles and improves the stability of the deep foundation pit pile anchor support structure. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of the deep foundation pit pile anchor support structure of this application;

[0028] Figure 2 yes Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0029] Figure 3 yes Figure 2 Enlarged schematic diagram of section B.

[0030] Reference numerals in the attached drawings: 1. Support pile; 11. Crown beam; 2. First anchor bolt; 21. Fixing element; 3. Connecting beam; 4. Support beam; 41. Bending part; 42. Locking element; 5. Extension plate; 51. Fixing rod; 6. Second anchor bolt; 7. Support frame; 8. Third anchor bolt. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a deep foundation pit pile anchor support structure.

[0033] Reference Figure 1 and Figure 2 The deep foundation pit pile-anchor support structure includes support piles 1, capping beams 11, and first anchor rods 2. Multiple sets of support piles 1 are arranged at intervals along the edge of the foundation pit. The capping beams 11 are set on the top of each support pile 1 and are used to connect multiple sets of support piles 1. The first anchor rods 2 are anchored on the side wall of the foundation pit and connected to the support piles 1. A connecting beam 3 is set on the side of the support piles 1 away from the side wall of the foundation pit. The first anchor rods 2 pass through the support piles 1 and the connecting beams 3 in sequence and are locked and fixed by fasteners 21. Multiple sets of support beams 4 are arranged at intervals along the length direction of the connecting beams 3 on the side of the connecting beams 3 close to the side wall of the foundation pit. The two ends of the support beams 4 are respectively pressed against the side walls of adjacent support piles 1 and are used to prevent two adjacent sets of support piles 1 from getting close to each other.

[0034] Reference Figure 1Beforehand, holes are drilled on the ground surface of the foundation pit construction site, and multiple sets of support piles 1 are poured with reinforced concrete. Then, a cap beam 11 is poured on top of the multiple sets of support piles 1 with concrete and steel bars to connect the multiple sets of support piles 1 into a whole. Then the foundation pit is excavated.

[0035] Reference Figure 2 and Figure 3 The connecting beam 3 is pre-processed, and its length is equal to the width of the corresponding pit sidewall. The cross-section of the connecting beam 3 is an I-shaped steel structure. The support beam 4 is fixedly installed according to the distance between adjacent support piles 1. The support beam 4 has an arc-shaped structure and is a steel plate that can be bent and deformed. A bending part 41 is provided on the side of the support beam 4 near the support pile 1. A clamping groove is provided on the sidewall of the support pile 1. The bending part 41 of the support pile 1 is used to abut against the clamping groove and is locked and fixed to the support pile 1 by the locking member 42. In this embodiment, the locking member 42 includes an expansion bolt and a nut fixed on the support pile 1. The expansion bolt passes through the bending part 41, and then the nut is threadedly connected to the expansion bolt and the bending part 41 is abutted against the clamping groove.

[0036] Reference Figure 2 An extension plate 5 is provided on the connecting beam 3. Two sets of extension plates 5 are symmetrically installed on the upper and lower sides of the connecting beam 3. The two sets of extension plates 5 correspond to a set of support beams 4. The two sets of extension plates 5 are used to prevent the support beams 4 from sliding along the length direction of the support piles 1. The support beams 4 can slide on the extension plates 5, so that the extension beams only support the support beams 4 but do not affect the bending deformation of the support beams 4. Multiple sets of fixing rods 51 are fixedly installed on the side of the extension plate 5 near the pit sidewall. The fixing rods 51 are used to insert into the pit sidewall to improve the stability of the extension plate 5.

[0037] Reference Figure 1 and Figure 2As the foundation pit is constructed, once the pit reaches the set depth, the first anchor rod 2 is anchored through the support pile 1 and into the pit soil. Then, the second anchor rod 6 is anchored on the pit sidewall at the corresponding position in the middle of the support beam 4. Next, the pre-fabricated connecting beam 3 is placed at the designated position on the support pile 1, allowing the first anchor rod 2 to pass through the support pile 1 and the connecting beam 3 sequentially, and the second anchor rod 6 to pass through the support beam 4 and the connecting beam 3 sequentially. Then, a hydraulic mechanism is used to press the connecting beam 3 against the support pile 1, while simultaneously inserting multiple sets of fixing rods 51 on the extension plate 5 into the pit. Inside the side wall, the connecting beam 3 is finally locked by the fastener 21. Then, the second anchor rod 6 is fixedly connected to the side of the connecting beam 3 away from the support beam 4. The second anchor rod 6 is used to provide the connecting beam 3 and the support beam 4 with the force to move towards the side wall of the pit. In turn, the force of the second anchor rod 6 on the support beam 4 drives the support beam 4 to straighten, thereby providing support for the adjacent support piles 1, reducing the support force of the mutual support piles 1 moving closer to each other, and also reducing the force of deformation of the support piles 1 away from the side wall of the pit. In this embodiment, the fastener 21 is a nut that is threadedly connected to the first anchor rod 2.

[0038] Reference Figure 1 and Figure 2 After the first set of connecting beams 3 and supporting beams 4 are installed, the excavation of the foundation pit continues. After the foundation pit is excavated to a certain depth again, the connecting beams 3 and supporting beams 4 are installed again. The installation method of connecting beams 3 and supporting beams 4 is the same for different foundation pit depths. After the second set of connecting beams 3 and supporting beams 4 are installed, an X-shaped support frame 7 is set between the two sets of supporting beams 4 between adjacent support piles 1. The support frame 7 is used to support and connect adjacent supporting beams 4. The middle intersection of the support frame 7 is anchored to the side wall of the foundation pit by the third anchor rod 8. The end face of the support frame 7 is welded and fixed to the extension plate 5. The middle part of the support frame 7 is fixed to the side wall of the foundation pit by the third anchor rod 8. Through the support and fixation of the support frame 7, the probability of adjacent supporting beams 4 and connecting beams 3 slipping along the length direction of the support piles 1 is reduced.

[0039] Reference Figure 1 and Figure 2 As the excavation depth of the foundation pit increases, a set of connecting beams 3 and supporting beams 4 are installed at certain depths. Multiple sets of supporting beams 4 between two adjacent support piles 1 are supported and connected by support frames 7, which ultimately connects and fixes multiple sets of support piles 1 to the side wall of the foundation pit, improving the support effect of the foundation pit.

[0040] The working principle of this application embodiment is as follows:

[0041] A connecting beam 3 is added on the side of the support pile 1 away from the foundation pit sidewall, and the connecting beam 3 and the support pile 1 are anchored to the foundation pit sidewall by the first anchor rod 2. The arc-shaped support beam 4 set on the connecting beam 3 supports and fixes the two adjacent support piles 1, thereby reducing the probability of deformation between adjacent support piles 1. The second anchor rod 6 pulls the support beam 4 to press against the support pile 1. At the same time, the connecting beam 3, the support beam 4, the first anchor rod 2 and the second anchor rod 6 are fixed to form a whole. In conjunction with the layered X-shaped support frame 7, multiple layers of support beams 4 are connected in series to form a spatial constraint system, which reduces the probability of bending deformation of the support pile 1 and improves the stability of the deep foundation pit pile anchor support structure.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A deep foundation pit pile-anchor support structure, comprising support piles (1), a capping beam (11), and a first anchor rod (2), wherein multiple sets of the support piles (1) are arranged at intervals along the edge of the foundation pit, the capping beam (11) is set on the top of each support pile (1) and is used to connect multiple sets of support piles (1), and the first anchor rod (2) is anchored on the side wall of the foundation pit and connected to the support piles (1), characterized in that: A connecting beam (3) is provided on the side of the support pile (1) away from the side wall of the pit. The first anchor (2) passes through the support pile (1) and the connecting beam (3) in sequence and is locked and fixed by the fastener (21). Multiple sets of support beams (4) are provided at intervals along the length direction of the connecting beam (3) on the side of the connecting beam (3) close to the side wall of the pit. The two ends of the support beam (4) are respectively pressed against the side wall of the adjacent support pile (1) and used to prevent the two adjacent sets of support piles (1) from getting close to each other.

2. The deep foundation pile-anchor bracing structure according to claim 1, characterized by: A second anchor rod (6) is anchored on the side wall of the foundation pit corresponding to the middle of the support beam (4). The second anchor rod (6) passes through the support beam (4) and the connecting beam (3) in sequence and pulls the support beam (4) and the connecting beam (3) to move closer to the side wall of the foundation pit.

3. The deep foundation pile-anchor bracing structure according to claim 2, characterized by: The support beam (4) has an arc-shaped structure, and the force exerted by the second anchor rod (6) on the support beam (4) is used to drive the support beam (4) to move in the straightening direction.

4. The deep foundation pile-anchor bracing structure according to claim 2, characterized by: The support pile (1) is provided with multiple sets of connecting beams (3) and support beams (4) at intervals along its length. The multiple sets of support beams (4) between adjacent support piles (1) are mutually supported and connected by X-shaped support frames (7).

5. The deep excavation pile-anchor bracing structure according to claim 4, wherein: The cross position in the middle of the support frame (7) is anchored to the side wall of the pit by the third anchor rod (8).

6. The deep excavation pile-anchor bracing structure according to claim 3, wherein: The cross-section of the connecting beam (3) is an I-shaped steel structure, and the supporting beam (4) is a steel plate that can undergo bending deformation.

7. The deep excavation pile-anchor bracing structure according to claim 6, characterized by: The support beam (4) has a bent part (41) on the side near the support pile (1). The support pile (1) has a clamping groove on its side wall. The bent part (41) is pressed against the clamping groove and locked onto the support pile (1) by the locking part (42).

8. The deep foundation pit pile anchor support structure according to claim 3, characterized in that: The connecting beam (3) is provided with an extension plate (5). The extension plate (5) is provided on the upper and lower sides of the connecting beam (3) and is used to prevent the support beam (4) from sliding along the length direction of the support pile (1). The extension plates (5) on opposite sides of the adjacent connecting beam (3) are fixedly connected by a support frame (7).

9. The deep excavation pile-anchor bracing structure according to claim 8, characterized by: The extension plate (5) is provided with multiple sets of fixing rods (51) on the side of the pit near the pit sidewall. The fixing rods (51) are inserted into the pit sidewall.

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