A deep foundation pit assembled supporting structure

Abstract

The utility model discloses a deep foundation pit assembly type supporting structure, including steel sheet pile, the lower side of steel sheet pile is equipped with concrete base, the bottom array of concrete base is equipped with a plurality of anchor rods, is equipped with a plurality of groups of hydraulic cylinder on concrete base, the top of hydraulic cylinder all is connected and is equipped with leveling steel sheet, is equipped with profile steel on leveling steel sheet, one side of profile steel is equipped with support rod, is equipped with support plate on support rod, is equipped with connecting rod on profile steel, is equipped with moving block on connecting rod, is equipped with clamping groove symmetrically on moving block, is equipped with clamping spring and clamping block on clamping groove, the lower part of split type concrete prefabricated base is the base with conical anchor rod, and the upper part is steel leveling platform, and then horizontal support profile steel and support rod, are convenient for horizontal support to steel sheet pile in foundation pit, through the cooperation of clamping spring and clamping block on moving block, it is convenient for support plate and profile steel connection, profile steel and support rod connection.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, and more specifically, it relates to a prefabricated support structure for deep foundation pits. Background Technology

[0002] With urban construction expanding into underground spaces, deep foundation pit projects face challenges such as complex geological conditions, tight schedules, and stringent environmental requirements. Traditional support structures (such as cast-in-place concrete walls + steel supports) have significant shortcomings: long construction cycles (7-10 days for a single section of support), large material waste (cast-in-place formwork and welding consumables cannot be recycled), and poor adaptability (soft soil foundations are prone to settlement, leading to support tilting). Especially in areas with high groundwater levels and dense surrounding buildings, the risk of support instability increases significantly.

[0003] Traditional cast-in-place foundations cannot dynamically compensate for uneven settlement of the foundation, which can easily lead to tilting of the support structure. Welded / bolted connections require on-site positioning and adjustment, which is time-consuming and has poor accuracy. Conventional interlocking water sealing relies solely on rubber strips, which are prone to leakage under high water pressure conditions. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the problems existing in the prior art, this utility model provides a prefabricated support structure for deep foundation pits, thereby solving the technical problem mentioned in the background art that traditional cast-in-place foundations cannot dynamically compensate for uneven settlement of the foundation.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated support structure for deep foundation pits, comprising steel sheet piles, wherein multiple steel sheet piles are connected by an array of interlocking joints, a concrete base is provided on one side of the lower part of each steel sheet pile, multiple anchor rods are arrayed at the bottom of the concrete base, multiple sets of hydraulic cylinders are provided on the concrete base, a leveling steel plate is connected to the top of each hydraulic cylinder, a steel profile is provided on the leveling steel plate, a support rod is provided on one side of the steel profile, a support plate is provided on the support rod, a connecting rod is provided on the steel profile, a moving block is provided on the connecting rod, a snap-fit ​​groove is symmetrically provided on the moving block, a snap-fit ​​spring and a snap-fit ​​block are provided on the snap-fit ​​groove, and the bottom of the snap-fit ​​groove is connected to the snap-fit ​​block by a snap-fit ​​spring.

[0008] The present invention is further configured such that the connecting rod is provided with a moving groove that cooperates with the moving block, and a moving screw is provided in the moving groove. The moving screw is threadedly connected to the moving block, which facilitates the adjustment of the position of the moving block and the locking block.

[0009] The present invention is further configured such that a limiting frame is provided on the steel sheet pile, a limiting rod is provided on the limiting frame, and a limiting hole is provided on the steel section, so as to facilitate the connection between the steel sheet and the steel sheet pile.

[0010] The present invention is further configured such that a limiting plate is provided on the limiting rod, and a limiting spring is provided between the limiting plate and the limiting frame, so that the limiting rod has a continuous and stable elastic force pointing towards the limiting hole.

[0011] The present invention is further provided that the leveling steel plate is provided with a limiting block that cooperates with the steel section to facilitate limiting the position of the steel section.

[0012] The present invention is further provided with a positioning block on the leveling steel plate that cooperates with the steel sheet pile, so as to facilitate the determination of the installation position of the steel sheet device.

[0013] The present invention is further provided that a main channel is provided at the locking joint of the sheet pile, and a water-swellable rubber strip is provided on the main channel, which improves the water-stopping and sealing performance of the sheet pile connection.

[0014] The present invention is further configured such that secondary channels are provided on both sides of the main channel, and a fast-setting polyurethane foaming agent is injected into the secondary channels to achieve a double water-stopping barrier.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a prefabricated support structure for deep foundation pits, which has the following beneficial effects:

[0017] 1. The split-type precast concrete base has a base with tapered anchor rods at the bottom and a steel leveling platform at the top, which horizontally supports the steel profiles and support rods. This facilitates horizontal support of the sheet piles in the foundation pit, prevents the overall support system from sinking, and improves the stability of the support.

[0018] 2. The connection between the spring and the locking block on the moving block facilitates the connection between the support plate and the steel section. The connection between the steel section and the support rod is achieved by extending the steel section into the limiting frame and connecting and fixing the steel section and the steel sheet pile through the cooperation between the limiting rod and the limiting hole, thereby improving the stability of the support structure.

[0019] 3. The main channel is filled with high-viscosity water-swellable rubber strips (expansion rate ≥300%), and the secondary channel is injected with quick-setting polyurethane foaming agent. The mixture is then pressurized and injected through the pre-reserved grouting holes at the top of the pile to form a physical and chemical double water-stopping barrier, which improves the waterproof sealing performance of the steel sheet pile. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a prefabricated support structure for deep foundation pits according to this utility model.

[0021] Figure 2 for Figure 1 A magnified schematic diagram of a portion of the structure of A in the diagram;

[0022] Figure 3 This is a schematic diagram of the cooperative structure of the concrete base, anchor bolt, hydraulic cylinder, leveling steel plate, structural steel, support rod and support plate in this utility model;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of a portion of the structure of B;

[0024] Figure 5 This is a cross-sectional view of the connecting rod in this utility model.

[0025] In the diagram: 1. Sheet pile; 2. Concrete base; 3. Anchor bolt; 4. Hydraulic cylinder; 5. Leveling steel plate; 6. Structural steel; 7. Support rod; 8. Support plate; 9. Connecting rod; 10. Moving block; 11. Snap-fit ​​groove; 12. Snap-fit ​​spring; 13. Snap-fit ​​block; 14. Moving groove; 15. Moving screw; 16. Limiting frame; 17. Limiting rod; 18. Limiting hole; 19. Limiting plate; 20. Limiting spring; 21. Limiting block; 22. Positioning block; 23. Main channel; 24. Water-swellable rubber strip; 25. Secondary channel; 26. Quick-setting polyurethane foaming agent. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5A prefabricated support structure for deep foundation pits includes sheet piles 1, multiple sheet piles 1 connected by an array of interlocking joints, a concrete base 2 below the sheet piles 1, multiple anchor bolts 3 arrayed at the bottom of the concrete base 2, multiple sets of hydraulic cylinders 4 installed on the concrete base 2, a leveling steel plate 5 connected to the top of each hydraulic cylinder 4, a steel section 6 on the leveling steel plate 5, a support rod 7 on one side of the steel section 6, a support plate 8 on the support rod 7, a connecting rod 9 on the steel section 6, a moving block 10 on the connecting rod 9, and a snap-fit ​​block 13. A symmetrical snap-fit ​​groove 11 is provided, and a snap-fit ​​spring 12 and a snap-fit ​​block 13 are provided on the snap-fit ​​groove 11. The bottom of the snap-fit ​​groove 11 is connected to the snap-fit ​​block 13 through the snap-fit ​​spring 12. A limiting block 21 that cooperates with the section steel 6 is provided on the leveling steel plate 5. A positioning block 22 that cooperates with the steel sheet pile 1 is provided on the leveling steel plate 5. A main channel 23 is opened at the locking port of the steel sheet pile 1. A water-swellable rubber strip 24 is provided on the main channel 23. A secondary channel 25 is provided on both sides of the main channel 23. A quick-setting polyurethane foaming agent 26 is injected into the secondary channel 25.

[0030] In this embodiment, during use, the concrete base 2 is prefabricated in a prefabrication yard. A graded sand and gravel cushion layer is laid at the bottom of the foundation pit, and the concrete base 2 is positioned and installed. Anchor rods 3 are inserted into the graded gravel and the bottom of the foundation pit to fix the position of the concrete base 2. The leveling steel plate 5 is adjusted by hydraulic cylinder 4, and steel sections 6 are installed on the leveling steel plate 5. Steel sheet piles 1 are installed by limiting the positioning with the cooperation of positioning blocks 22. The steel sheet piles 1 are preferably Larssen steel sheet piles 1, which are connected by interlocking. The main channel 23 is filled with high-viscosity water-swellable rubber strips 24 with an expansion rate ≥300%, and the secondary channel 25 is injected with quick-setting polyurethane foam 26. The grouting is pressurized through the grouting holes reserved at the top of the pile to form a physical + chemical double water-stop barrier. The steel sections 6 on both sides of the foundation pit are supported by support rods 7 and support plates 8, thereby improving the stability of the foundation pit support.

[0031] Please see Figures 3-5 As one embodiment of the sheet pile 1, the steel section 6 and the support rod 7: the connecting rod 9 is provided with a moving groove 14 that cooperates with the moving block 10, the moving groove 14 is provided with a moving screw 15, the moving screw 15 is threadedly connected to the moving block 10, the sheet pile 1 is provided with a limiting frame 16, the limiting frame 16 is provided with a limiting rod 17, the steel section 6 is provided with a limiting hole 18, the limiting rod 17 is provided with a limiting plate 19, and a limiting spring 20 is provided between the limiting plate 19 and the limiting frame 16.

[0032] More specifically, when connecting the steel section 6 and the sheet pile 1, the limiting rod 17 is pulled outward. The limiting rod 17 pulls the limiting spring 20 through the limiting plate 19. After the steel section 6 extends into the limiting frame 16, the limiting rod 17 is released, so that the limiting rod 17 is aligned with the limiting hole 18, thereby connecting and fixing the position of the steel section 6 and the sheet pile 1. After aligning the support plate 8 of the support rod 7 with the connecting rod 9, the support plate 8 passes through the locking block 13 by squeezing the locking block 13 and the locking spring 12. Then, the locking block 13 extends under the elastic force of the locking spring 12. The moving screw 15 is rotated to adjust the position of the moving block 10, so that the bottom of the locking block 13 abuts against the support plate 8, thereby connecting the support rod 7 and the steel section 6 and improving the stability of the support structure.

[0033] In summary, during the use or operation of the overall equipment: The concrete base 2 is prefabricated in the prefabrication yard. A graded gravel cushion layer is laid at the bottom of the foundation pit. The concrete base 2 is then positioned and installed. Anchor bolts 3 are inserted into the graded gravel and the bottom of the foundation pit to fix the position of the concrete base 2. The leveling steel plate 5 is adjusted using hydraulic cylinder 4, and steel sections 6 are installed on the leveling steel plate 5. Steel sheet piles 1 are installed using positioning blocks 22 for positioning and limiting. Larssen steel sheet piles 1 are preferred. The Larssen steel sheet piles 1 are connected by interlocking clamps. The main channel 23 is filled with high-viscosity water-swellable rubber strips 24 with an expansion rate ≥300%. The secondary channel 25 is injected with quick-setting polyurethane foam 26. Grouting is performed through pre-reserved grouting holes at the pile top, forming a physical + chemical double water-stop barrier. Support rods 7 and support plates 8 support the steel sections 6 on both sides of the foundation pit, thereby improving the stability of the foundation pit support.

[0034] When connecting the steel section 6 and the sheet pile 1, the limiting rod 17 is pulled outward. The limiting rod 17 pulls the limiting spring 20 through the limiting plate 19. After the steel section 6 extends into the limiting frame 16, the limiting rod 17 is released, so that the limiting rod 17 is aligned with the limiting hole 18, thereby connecting and fixing the position of the steel section 6 and the sheet pile 1. After aligning the support plate 8 of the support rod 7 with the connecting rod 9, the support plate 8 passes through the locking block 13 by squeezing the locking block 13 and the locking spring 12. Then, the locking block 13 extends under the elastic force of the locking spring 12. The moving screw 15 is rotated to adjust the position of the moving block 10, so that the bottom of the locking block 13 abuts against the support plate 8, thereby connecting the support rod 7 and the steel section 6 and improving the stability of the support structure.

[0035] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0036] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A prefabricated support structure for deep foundation pits, comprising steel sheet piles (1), characterized in that: The sheet piles (1) are connected by a lock array. A concrete base (2) is provided below the sheet piles (1). A number of anchor rods (3) are arranged at the bottom of the concrete base (2). A number of hydraulic cylinders (4) are installed on the concrete base (2). A leveling steel plate (5) is connected to the top of each hydraulic cylinder (4). A steel section (6) is provided on the leveling steel plate (5). A support rod (7) is provided on one side of the steel section (6). A support plate (8) is provided on the support rod (7). A connecting rod (9) is provided on the steel section (6). A moving block (10) is provided on the connecting rod (9). A snap-fit ​​groove (11) is symmetrically provided on the moving block (10). A snap-fit ​​spring (12) and a snap-fit ​​block (13) are provided on the snap-fit ​​groove (11). The bottom of the snap-fit ​​groove (11) is connected to the snap-fit ​​block (13) by the snap-fit ​​spring (12).

2. The prefabricated support structure for deep foundation pits according to claim 1, characterized in that: The connecting rod (9) is provided with a moving groove (14) that cooperates with the moving block (10). The moving groove (14) is provided with a moving screw (15), and the moving screw (15) is threadedly connected to the moving block (10).

3. The prefabricated support structure for deep foundation pits according to claim 1, characterized in that: The sheet pile (1) is provided with a limiting frame (16), the limiting frame (16) is provided with a limiting rod (17), and the steel section (6) is provided with a limiting hole (18).

4. The prefabricated support structure for deep foundation pits according to claim 3, characterized in that: The limiting rod (17) is provided with a limiting plate (19), and a limiting spring (20) is provided between the limiting plate (19) and the limiting frame (16).

5. The prefabricated support structure for deep foundation pits according to claim 1, characterized in that: The leveling steel plate (5) is provided with a limiting block (21) that cooperates with the section steel (6).

6. The prefabricated support structure for deep foundation pits according to claim 5, characterized in that: The leveling steel plate (5) is provided with a positioning block (22) that cooperates with the sheet pile (1).

7. The prefabricated support structure for deep foundation pits according to claim 1, characterized in that: The steel sheet pile (1) has a main channel (23) at the lock opening, and the main channel (23) is provided with a water-swellable rubber strip (24).

8. A prefabricated support structure for deep foundation pits according to claim 7, characterized in that: The main channel (23) has secondary channels (25) on both sides, and the secondary channels (25) are filled with a quick-setting polyurethane foaming agent (26).

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