Turnbuckle foundation pit reinforcing device for connecting single-splicing waist beams

Abstract

The utility model relates to the technical field of foundation pit supporting, in particular to a turnbuckle foundation pit reinforcing device connected with a single splicing waist beam, which comprises SPIV steel sheet piles, the single splicing waist beam, a steel support and optimized turnbuckles, the SPIV steel sheet piles serve as a main foundation pit supporting structure, two fixing blocks are oppositely arranged on the inner walls of the SPIV steel sheet piles on the two sides of the inner wall of a foundation pit, and the SPIV steel sheet piles are arranged on the two sides of the inner wall of the foundation pit. A single-splicing waist beam is installed on the fixing block, a steel support is arranged in the middle of the single-splicing waist beam and used for enhancing the stability of the structure, and an optimized turnbuckle is connected with the single-splicing waist beam and the inner wall of the SPIV type steel sheet pile in a cable-stayed mode and connected with the inner wall of the SPIV type steel sheet pile and the single-splicing waist beam in an anchoring mode. The optimized turnbuckles, the single-spliced waist beams and the SPIV steel sheet piles jointly form a triangular frame structure; the optimized turnbuckles are fixed to the two sides of the single-splicing waist beam and the two sides of the steel sheet pile in a cable-stayed mode, the connecting performance of the steel structure cable-strut connecting piece is obviously enhanced, the construction cost is low, the transportation workload is small, and the requirement for personnel is low.

Description

Technical Field

[0001] The utility model relates to the technical field of pit foundation support, in particular to a turnbuckle screw foundation pit reinforcement device connected with a single waist beam. Background Art

[0002] During the excavation of foundation pits, soil loosening and slope collapse are common safety hazards. In order to ensure the safety of construction, it is crucial to reinforce the side walls of the foundation pit, that is, the slope. The selection and implementation of reinforcement measures directly affect the progress and quality of the project. Therefore, in the design of foundation pit support, it is necessary to fully consider factors such as geological conditions, foundation pit depth, and surrounding environment, and select the most appropriate reinforcement plan.

[0003] As a commonly used foundation pit support structure, the waist beam can effectively transmit and disperse the pressure of the soil on the side wall of the foundation pit through the connection with the anchor rod or the inner support rod. The waist beam + steel support combination has the advantages of stable structure, reasonable force, and convenient construction. Therefore, it has been widely used in many foundation pit support projects. Among them, the single waist beam is suitable for small foundation pits with shallow depths, which can effectively save material costs.

[0004] However, in some complex geological environments, a simple waist beam plus steel support combination may not meet the requirements of support safety and stability. Utility Model Content

[0005] The purpose of the utility model is to provide a turnbuckle screw foundation pit reinforcement device for connecting a single waist beam, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A turnbuckle screw foundation pit reinforcement device for connecting a single-piece waist beam, comprising a SPIV steel sheet pile, a single-piece waist beam, a steel support, and an optimized turnbuckle screw. The SPIV steel sheet pile is a main foundation pit supporting structure and is located on both sides of the inner wall of the foundation pit. Two fixing blocks are relatively arranged on the inner wall of the SPIV steel sheet pile, and the single-piece waist beam is installed on the fixing block. A steel support is arranged in the middle position of the single-piece waist beam to enhance the stability of the structure. The optimized turnbuckle screw is connected to the inner wall of the single-piece waist beam and the SPIV steel sheet pile in an oblique pull manner, and is anchored to the inner wall of the SPIV steel sheet pile and the single-piece waist beam. The optimized turnbuckle screw, the single-piece waist beam and the SPIV steel sheet pile together form a triangular frame structure.

[0008] Preferably, the optimized turnbuckle screw includes a threaded adjusting rod, a cross frame, a nut and a pull rod, nuts are provided at both ends of the cross frame, one end of the adjusting rod is spirally arranged in the cross frame through the nut, and thin steel plates are provided on both sides, and the other end of the adjusting rod is fixedly installed with a pull rod.

[0009] Preferably, the threaded end of the adjusting rod and the corresponding thin steel plate are both provided with bolt holes, bolts are installed in the bolt holes, and nuts are fixed to the ends of the bolts.

[0010] Preferably, the steel supports are steel pipes with an outer diameter of 250 mm and a wall thickness of 10 mm, with a spacing of 4 m. The steel supports are arranged at a distance of less than 1 m from the top of the foundation pit.

[0011] Preferably, the single-piece waist beam is a steel member, and the flanges and webs of the single-piece waist beam should be welded with stiffening plates, the thickness of the stiffening plates should not be less than 10 mm, and the weld height should not be less than 6 mm.

[0012] Preferably, both ends of the steel support are fixed to the single waist beam by screws.

[0013] Compared with the prior art, the technical effects and advantages of the utility model are:

[0014] The support form of the utility model solves the problem of low bearing capacity of the foundation pit in the single waist beam plus support support form, and the problem of instability during the support process. The manufacturing process of the improved turnbuckle screw is to drill a hole at the end of the screw rod, and then place two thin steel plates on both sides of the turnbuckle screw, which can be moved on the horizontal frame. Every time the screw rotates 180 degrees, the screw hole at the end of the rod can meet the screw holes of the two thin steel plates, and then fixed with bolts. The screw can adjust the telescopic length of both ends of the screw by loosening the bolts, thereby facilitating the fixing height of the turnbuckle screw, which has the advantages of simple manufacturing, easy installation and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 A schematic diagram of the improved turnbuckle screw of the utility model;

[0017] Figure 3 The figure is a side view of the improved turnbuckle screw of the utility model.

[0018] In the figure: 1. SPIV steel sheet pile; 2. Single waist beam; 3. Steel support; 4. Optimized turnbuckle screw; 5. Adjustment rod; 6. Cross frame; 7. Nut; 8. Pull rod; 9. Thin steel plate; 10. Bolt hole; 11. Bolt; 12. Nut; 13. Fixing block; 14. Foundation pit. DETAILED DESCRIPTION

[0019] 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. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figures 1 to 3 , the utility model provides a technical solution:

[0021] A turnbuckle screw foundation pit reinforcement device connected with a single waist beam, comprising: a SPIV steel sheet pile 1, a single waist beam 2, a steel support 3, and an optimized turnbuckle screw 4. The SPIV steel sheet pile 1 is the main foundation pit support structure, located on both sides of the inner wall of the foundation pit 14. The SPIV steel sheet pile 1 has high strength and rigidity, can effectively withstand the pressure of soil and water, and maintain the stability of the foundation pit. On the inner wall of the SPIV steel sheet pile 1, two fixing blocks 13 are relatively arranged, and a single waist beam 2 is installed on the fixing block 13. The single waist beam 2 is installed on the inner wall of the SPIV steel sheet pile 1 through the fixing block 13, and is connected to the steel support 3 to form a stable support system. The middle position of the single waist beam 2 is provided with A steel support 3 is provided to enhance the stability of the structure, withstand the pressure from the soil and water, and prevent the foundation pit from deformation or collapse. The optimized turnbuckle screw 4 is connected to the inner wall of the single waist beam 2 and the SPIV steel sheet pile 1 in an oblique manner, and is anchored to the inner wall of the SPIV steel sheet pile 1 and the single waist beam 2. The optimized turnbuckle screw 4, the single waist beam 2 and the SPIV steel sheet pile 1 together form a triangular frame structure. The overall stability and bearing capacity of the support structure are enhanced by connecting and fixing the optimized turnbuckle screw 4. As an adjustable fastener, the turnbuckle screw 4 can adjust its tightness according to actual needs, thereby achieving precise control of the support structure and further enhancing the stability of the foundation pit 14.

[0022] Specifically, the optimized turnbuckle screw 4 includes a threaded adjustment rod 5, a cross frame 6, a nut 7 and a pull rod 8. Nuts 7 are provided at both ends of the cross frame 6. One end of the adjustment rod 5 is spirally arranged in the cross frame 6 through the nut 7, and thin steel plates 9 are provided on both sides. The other end of the adjustment rod 5 is fixedly installed with a pull rod 8. It has the characteristics of saving basic steel, simple processing, convenient construction, etc., and improves construction efficiency. Bolt holes 10 are provided on the threaded end of the adjustment rod 5 and the corresponding thin steel plate 9. Bolts 11 are installed in the bolt holes 10. Nuts 12 are fixed at the ends of the bolts 11. Rotating the adjustment rod 5 can optimize the tension or length of the turnbuckle screw 4. Since the adjustment rod 5 has a threaded end and is spirally arranged in the cross frame 6 through the nut 7, when the adjustment rod 5 is rotated, it will move in the cross frame 6 along the thread direction, thereby changing the overall length of the turnbuckle screw. Bolt holes 10 are provided on the threaded end of the adjustment rod 5 and the corresponding thin steel plate 9. Bolts 11 pass through these holes and are fixed with nuts 12. This design allows optimized anchoring of the turnbuckle screw 4 with the single waist beam 2 and the SPIV steel sheet pile 1, enhancing the stability and firmness of the entire structure. The combined use of the bolt 11 and the nut 12 provides additional fixing and supporting force, preventing the turnbuckle screw 4 from loosening or moving when subjected to force.

[0023] Specifically, the depth of the foundation pit 14 is between 2m and 3.5m.

[0024] Specifically, the steel supports 3 are steel pipes with an outer diameter of 250 mm and a wall thickness of 10 mm, with a spacing of 4 m. The steel supports 3 are arranged at a distance of less than 1 m from the top of the foundation pit 14 .

[0025] Specifically, the single-piece waist beam 2 is a steel member, and the flange and web of the single-piece waist beam 2 should be welded with stiffening plates. The thickness of the stiffening plates should not be less than 10 mm, and the weld height should not be less than 6 mm.

[0026] Specifically, both ends of the steel support 3 are fixed to the single waist beam 2 by screws.

[0027] The installation steps of this utility model are as follows:

[0028] 1. Construction preparation and environment construction: First, set up construction isolation fences to ensure construction safety. At the same time, install SPⅣ steel sheet piles 1 as the main foundation pit support structure, and set up intercepting drainage ditches on the top of the pit to prevent water from flowing into the foundation pit.

[0029] 2. Excavation of foundation pit and installation of support: Excavate foundation pit 14 to the bottom elevation of steel support 3. Excavate a trench at the edge of the pit and install the single waist beam 2; then, set up the steel support 3, and control the preload at 50kn to ensure that the road surface does not rise; then, add the improved optimized turnbuckle screw 4, and connect the single waist beam 2 and the inner wall of SPⅣ steel sheet pile 1 by diagonal pull. Adjust and control the optimized turnbuckle screw 4 on the fixed angle steel in two directions of the top of the foundation angle steel edge to ensure that the height difference and torsion of the upper edge of the angle steel meet the stability requirements.

[0030] 3. Layered excavation and pipeline construction: Under the premise of ensuring the stability of the support, carry out layered and segmented symmetrical excavation to the pit bottom elevation. During the excavation process, set up drainage blind ditches and carry out underground pipeline construction. After the pipeline construction is completed, the foundation pit 14 is backfilled to a position 50cm below the support 3 and the single waist beam 2; then, the steel support 3 and the single waist beam 2 are removed, and the upper covering soil is backfilled according to relevant professional requirements until the foundation pit 14 is backfilled to the ground elevation of the pit top.

[0031] 4. Steel sheet pile recovery and ground restoration: Recover the SP IV steel sheet pile 1 and use M5 cement mortar to backfill the gap left after the SP IV steel sheet pile 1 is pulled out. After removing the construction fence, level the ground according to relevant professional requirements to complete the entire installation process.

[0032] The remaining parts not described in this utility model are existing or known technologies.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turnbuckle screw foundation pit reinforcement device for connecting a single waist beam, characterized in that: include: SPIV steel sheet piles (1), single-piece waist beams (2), steel supports (3), and optimized turnbuckle screws (4). The SPIV steel sheet piles (1) are the main supporting structure of a foundation pit (14) and are located on both sides of the inner wall of the foundation pit (14). Two fixing blocks (13) are arranged on the inner wall of the SPIV steel sheet piles (1) in a relative manner. The single-piece waist beams (2) are installed on the fixing blocks (13). The middle position of the single-piece waist beams (2) is provided with a steel support (3) to enhance the stability of the structure. The optimized turnbuckle screws (4) connect the single-piece waist beams (2) and the inner wall of the SPIV steel sheet piles (1) in an oblique manner and are anchored to the inner wall of the SPIV steel sheet piles (1) and the single-piece waist beams (2). The optimized turnbuckle screws (4), the single-piece waist beams (2), and the SPIV steel sheet piles (1) together form a triangular frame structure.

2. A turnbuckle screw foundation pit reinforcement device for connecting a single waist beam according to claim 1, characterized in that: The optimized turnbuckle screw (4) comprises a threaded adjustment rod (5), a cross frame (6), a nut (7) and a pull rod (8), wherein nuts (7) are provided at both ends of the cross frame (6), one end of the adjustment rod (5) is spirally arranged in the cross frame (6) through the nut (7), and thin steel plates (9) are provided on both sides, and the other end of the adjustment rod (5) is fixedly mounted with a pull rod (8).

3. A turnbuckle screw foundation pit reinforcement device for connecting a single waist beam according to claim 2, characterized in that: The threaded end of the adjusting rod (5) and the corresponding thin steel plate (9) are both provided with a bolt hole (10), a bolt (11) is installed in the bolt hole (10), and a nut (12) is fixed to the end of the bolt (11).

4. A turnbuckle screw foundation pit reinforcement device for connecting a single waist beam according to claim 1, characterized in that: The steel supports (3) are of specifications of steel pipes with an outer diameter of 250 mm and a wall thickness of 10 mm, and are spaced 4 m apart. The steel supports (3) are arranged at a distance of less than 1 m from the top of the foundation pit (14).

5. The turnbuckle screw foundation pit reinforcement device for connecting a single waist beam according to claim 1 is characterized in that: The single-piece waist beam (2) is a steel member. The flange and web of the single-piece waist beam (2) should be welded with stiffening plates. The thickness of the stiffening plates should not be less than 10 mm, and the height of the weld should not be less than 6 mm.

6. A turnbuckle screw foundation pit reinforcement device for connecting a single waist beam according to claim 1, characterized in that: Both ends of the steel support (3) are fixed to the single waist beam (2) by means of screws.

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