Foundation pit support and inclined strut connecting structure
The inclined bracing connection structure combining H-beams and Larssen sheet piles solves the problems of weak lateral pressure stiffness and high cost of sheet piles in the foundation pit retaining system, achieving efficient and stable foundation pit retaining effect, and is suitable for deep foundation pit construction.
Patent Information
- Application Number
- CN202520135104.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-01-20
AI Technical Summary
In existing foundation pit support systems, sheet piles have weak lateral pressure stiffness, high cost, and are difficult to dismantle. Traditional internal support systems are expensive and have long construction periods, making it difficult to meet the stability requirements of deep foundation pits.
The structure employs a bracing connection using H-beams and Larssen sheet piles. By utilizing the high lateral stiffness and bending resistance of the H-beams and combining them with the water-stopping function of the sheet piles, the foundation pit retaining structure is constructed through hooking and bracing to disperse the lateral forces of the soil and improve overall stability.
It achieves a high-rigidity foundation pit retaining structure, which is efficient in construction, easy to dismantle and reuse, shortens the construction cycle, reduces costs, and improves the overall stability of the foundation pit.
Smart Images
Figure CN223893384U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotechnical engineering technology, and in particular to a foundation pit retaining and inclined bracing connection structure. Background Technology
[0002] The foundation pit is reinforced by setting up retaining structures and support systems to ensure stability during construction, thereby strengthening the soil and preventing collapse.
[0003] In the current foundation pit retaining system, steel sheet piles are not suitable for projects with large foundation pit excavation depths due to their relatively weak lateral pressure stiffness. Using concrete to form a retaining wall is costly, difficult to dismantle later, and easily generates a large amount of construction waste. Traditional internal support systems are expensive, require concrete curing, and have a long construction period. Utility Model Content
[0004] In view of the above-mentioned prior art, the present invention provides a foundation pit retaining and diagonal bracing connection structure, which utilizes H-beams to provide greater lateral stiffness and bending resistance, and combines the water-stopping function of steel sheet piles to provide a more convenient diagonal bracing structure, which has good engineering practical significance.
[0005] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:
[0006] A foundation pit retaining and bracing connection structure includes a foundation pit retaining structure and a bottom slab. The foundation pit retaining structure is composed of several retaining units. Each retaining unit includes an H-beam and two Larssen sheet piles. The Larssen sheet piles have second teeth on both sides of their edges. The H-beam has first teeth fixedly connected to both ends of one side flange. The two Larssen sheet piles are hooked together through the second teeth. The first teeth of the H-beam are hooked to the second teeth of the Larssen sheet piles. The other side flange of the H-beam is outside the foundation pit. A capping beam is cast at the top of the foundation pit retaining structure, and a corbel is cast on the bottom slab. A bracing is connected between the capping beam and the corbel.
[0007] Furthermore, the capping beam is provided with a first inclined surface, and the corbel is provided with a second inclined surface. The first inclined surface and the second inclined surface are opposite to each other and are arranged in parallel. The diagonal brace is perpendicular to the first inclined surface and the second inclined surface.
[0008] Furthermore, the curvature of both the first and second tooth openings is less than 90°.
[0009] Furthermore, embedded parts are provided on both the first and second inclined surfaces. The embedded parts include a connecting plate. A first anchor bar is fixedly connected to one side surface of the connecting plate. The first anchor bar is fixedly connected to the capping beam and the corbel respectively. The connecting plate abuts against the first and second inclined surfaces respectively. The side surface of the connecting plate away from the first anchor bar is welded and fixed to the diagonal brace.
[0010] Furthermore, the connecting plate is a square steel plate, the diagonal brace is a round steel pipe, and the center of the connecting plate is on the center line of the diagonal brace.
[0011] Furthermore, a second anchor bar is provided inside the corbel, which extends into the base plate and is connected to the base plate during casting.
[0012] Furthermore, a force transmission strip is cast on the bottom slab, which is located inside the pit and abuts against the pit retaining structure.
[0013] The beneficial effects of this utility model are as follows: The foundation pit retaining structure is composed of steel sheet piles and H-beams, which fully utilizes the characteristics of H-beams, resulting in high structural rigidity and the ability to withstand large loads. This effectively reduces foundation pit deformation. The steel sheet piles and H-beams are constructed separately, allowing for flexible operation and high construction efficiency. After the foundation pit is completed, all the steel sheet piles and H-beams can be recycled and reused. The casting of the capping beam makes all the steel sheet piles and H-beams a whole, preventing uneven deformation due to local stress. The use of diagonal bracing effectively disperses the lateral forces of the soil, improving the overall stability of the foundation pit. The construction process is relatively simple and the construction period is shortened. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the connection structure between the foundation pit retaining wall and the diagonal brace of this utility model;
[0015] Figure 2 This is an enlarged view of area B of the foundation pit retaining and diagonal brace connection structure of this utility model;
[0016] Figure 3 This is a schematic diagram of the force transmission strip on the bottom plate and the retaining structure of the foundation pit enclosure and diagonal brace connection structure of this utility model;
[0017] Figure 4 This is an enlarged view of area A of the foundation pit retaining and diagonal brace connection structure of this utility model;
[0018] Figure 5 This is a schematic diagram of the embedded parts for the connection structure between the foundation pit support and the diagonal brace of this utility model;
[0019] Figure 6 This is a schematic diagram of the corbel structure of the foundation pit retaining and diagonal bracing connection structure of this utility model.
[0020] Explanation of reference numerals in the attached drawings: 1. Excavation pit retaining structure; 2. Top beam; 3. Force transmission belt; 4. Embedded part; 5. Diagonal brace; 6. Corbel; 7. Bottom plate; 8. H-beam; 9. Larssen sheet pile; 10. First tooth; 11. First anchor bar; 12. Second anchor bar; 13. Second tooth; 14. First inclined surface; 15. Second inclined surface; 16. Connecting plate. Detailed Implementation
[0021] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in this specification of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.
[0022] Combined with reference to the appendix Figures 1 to 6 This utility model provides a foundation pit retaining and diagonal bracing connection structure, including a base plate 7, a foundation pit retaining structure 1 set on the edge of the base plate 7, the foundation pit retaining structure 1 is composed of several retaining units, the retaining unit includes an H-beam 8 and two Larssen sheet piles 9, the two sides of the Larssen sheet piles 9 are provided with second teeth 13, the two ends of one side flange of the H-beam 8 are fixedly connected with first teeth 10, the two Larssen sheet piles 9 are hooked together by the second teeth 13, the first teeth 10 of the H-beam 8 and the second teeth 13 of the Larssen sheet piles 9 are hooked together, the other side flange of the H-beam 8 is set on the outside of the foundation pit, the upper end of the foundation pit retaining structure 1 is cast with a capping beam 2, the base plate 7 is cast with a corbel 6, and diagonal bracing 5 is connected between the capping beam 2 and the corbel 6. By fully utilizing the high structural strength of H-beams 8 and combining them with Larssen sheet piles 9, the resulting foundation pit retaining structure 1 maintains good load-bearing capacity and is not easily deformed. Both ends of one flange of the H-beam 8 are welded with first teeth 10, and the two edges of the Larssen sheet piles 9 have second teeth 13. Two Larssen sheet piles 9 are hooked together via the second teeth 13 and then hooked to the first teeth 10 on the H-beam 8. This hooking mechanism facilitates easy installation and disassembly, resulting in high construction efficiency. The other flange of the H-beam 8 is located in the foundation pit... The outer side makes the inside of the foundation pit flat, which is convenient for construction. A capping beam 2 is poured on the top of the foundation pit retaining structure 1 to improve the overall stability of the foundation pit retaining structure 1. The capping beam 2 is directly connected to the corbel 6 on the bottom plate 7 and the diagonal brace 5 to effectively disperse the lateral force of the soil and further improve the overall stability. The H-beam 8 is H700×300×13×24 steel and is welded to the first tooth 10. The weld is continuous and full, and the weld height is 8mm. The H-beam 8 protrudes at least 500mm from the top surface of the capping beam 2 to facilitate subsequent extraction.
[0023] Preferably, the capping beam 2 has a first inclined surface 14, and the corbel 6 has a second inclined surface 15. The first inclined surface 14 and the second inclined surface 15 are opposite to and parallel to each other, and the diagonal brace 5 is perpendicular to the first inclined surface 14 and the second inclined surface 15. The first inclined surface 14 is made during the casting of the capping beam 2, and the second inclined surface 15 is made during the casting of the corbel 6. The first inclined surface 14 and the second inclined surface 15 are parallel to each other, which facilitates the connection of the diagonal brace 5. The diagonal brace 5 is perpendicular to the first inclined surface 14 and the second inclined surface 15. The pressure exerted by the diagonal brace 5 on the first inclined surface 14 and the second inclined surface 15 is perpendicular to the first inclined surface 14 and the second inclined surface 15, respectively. The diagonal brace 5 is not easy to slip or shift, and has higher safety.
[0024] Preferably, the curvature of both the first tooth 10 and the second tooth 13 is less than 90°. This ensures a stable connection between the H-beam 8 and the Larssen sheet pile 9, preventing disengagement and allowing for removal only from above.
[0025] Preferably, embedded parts 4 are provided on both the first inclined surface 14 and the second inclined surface 15. Each embedded part 4 includes a connecting plate 16. A first anchor bar 11 is fixedly connected to one side surface of the connecting plate 16. The first anchor bar 11 is cast and fixed to the capping beam 2 and the corbel 6 respectively. The connecting plate 16 abuts against the first inclined surface 14 and the second inclined surface 15 respectively. The side surface of the connecting plate 16 away from the first anchor bar 11 is welded and fixed to the diagonal brace 5. During the casting construction stage of the capping beam 2 and the corbel 6, the embedded part 4 is added, and the first anchor bar 11 of the embedded part 4 is cast into the capping beam 2 and the corbel 6. After the capping beam 2 and the corbel 6 reach their strength, the connecting plate 16 of the embedded part 4 is fixed to the first inclined surface 14 and the second inclined surface 15. Both ends of the diagonal brace 5 are welded and fixed to the connecting plate 16, avoiding the subsequent direct construction and fixing of the diagonal brace 5 on the capping beam 2 and the corbel 6, which would damage the structural integrity of the capping beam 2 and the corbel 6.
[0026] Preferably, the connecting plate 16 is a square steel plate, the diagonal brace 5 is a round steel pipe, and the center of the connecting plate 16 is on the center line of the diagonal brace 5. The connecting plate 16 is a 650×650×15 square steel plate, the diagonal brace 5 is a steel pipe with an outer diameter of 609mm and a thickness of 16mm, and the center of the connecting plate 16 is on the center line of the diagonal brace 5 to ensure that the connecting plate 16 is subjected to balanced force.
[0027] Preferably, the corbel 6 is provided with a second anchor bar 12, which extends into the base plate 7 and is cast and connected to the base plate 7. The corbel 6 is reinforced to the base plate 7 by the second anchor bar 12, thereby improving the stability of the corbel 6.
[0028] Preferably, a force transmission strip 3 is cast on the base slab 7, and the force transmission strip 3 is inside the pit and abuts against the pit retaining structure 1. A capping beam 2 is cast at the upper end of the pit retaining structure 1, and a force transmission strip is cast at the lower end of the pit retaining structure 1, thereby improving the overall stability of the pit retaining structure 1.
[0029] Working principle: H-beams 8 and Larssen sheet piles 9 are alternately inserted into the soil at the construction site. They are hooked together through the first tooth 10 and the second tooth 13 to complete the construction of the foundation pit retaining structure 1. The pouring of the capping beam 2 begins, fixing the H-beams 8 and Larssen sheet piles 9 into a whole. At the same time, during the pouring of the capping beam 2, the first anchor bar 11 of the embedded part 4 is poured in. The corbel 6 is poured on the bottom plate 7 and the first anchor bar 11 of the embedded part 4 is poured in. The corbel 6 and the bottom plate 7 are connected by the second anchor bar 12. After the capping beam 2 and the corbel 6 reach the strength standard, the connecting plate 16 of the embedded part 4 is fixed on the first inclined surface 14 and the second inclined surface 15. The two ends of the diagonal brace 5 are welded and fixed to the connecting plate 16 on the capping beam 2 and the corbel 6 respectively. Finally, the force transmission band 3 is poured along the foundation pit retaining structure 1 inside the foundation pit.
[0030] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the protection scope of the stated claims.
Claims
1. A foundation pit retaining and diagonal bracing connection structure, comprising a base plate (7), characterized in that: A foundation pit retaining structure (1) is provided on the edge of the base plate (7). The foundation pit retaining structure (1) is composed of several retaining units. Each retaining unit includes an H-beam (8) and two Larssen sheet piles (9). The Larssen sheet piles (9) have second teeth (13) on both sides of their edges. The H-beam (8) has first teeth (10) fixedly connected to both ends of one side flange. The two Larssen sheet piles (9) are hooked together through the second teeth (13). The first teeth (10) of the H-beam (8) and the second teeth (13) of the Larssen sheet piles (9) are hooked together. The other side flange of the H-beam (8) is located outside the foundation pit. A capping beam (2) is poured at the top of the foundation pit retaining structure (1). A corbel (6) is poured on the base plate (7). A diagonal brace (5) connects the capping beam (2) and the corbel (6).
2. The foundation pit retaining and diagonal bracing connection structure according to claim 1, characterized in that: The top beam (2) is provided with a first inclined surface (14), and the corbel (6) is provided with a second inclined surface (15). The first inclined surface (14) and the second inclined surface (15) are opposite to each other and are arranged in parallel. The diagonal brace (5) is perpendicular to the first inclined surface (14) and the second inclined surface (15).
3. The foundation pit retaining and diagonal bracing connection structure according to claim 1, characterized in that: The curvature of both the first tooth (10) and the second tooth (13) is less than 90°.
4. The foundation pit retaining and diagonal bracing connection structure according to claim 2, characterized in that: Embedded parts (4) are provided on the first inclined surface (14) and the second inclined surface (15). The embedded parts (4) include connecting plates (16). A first anchor bar (11) is fixedly connected to one side surface of the connecting plate (16). The first anchor bar (11) is cast and fixed to the top beam (2) and the corbel (6). The connecting plate (16) abuts against the first inclined surface (14) and the second inclined surface (15). The side surface of the connecting plate (16) away from the first anchor bar (11) is welded and fixed to the diagonal brace (5).
5. The foundation pit retaining and diagonal bracing connection structure according to claim 4, characterized in that: The connecting plate (16) is a square steel plate, the diagonal brace (5) is a circular steel pipe, and the center of the connecting plate (16) is on the center line of the diagonal brace (5).
6. The foundation pit retaining and diagonal bracing connection structure according to claim 1, characterized in that: The cow leg (6) is provided with a second anchor bar (12), which extends into the bottom plate (7) and is cast and connected to the bottom plate (7).
7. The foundation pit retaining and diagonal bracing connection structure according to claim 1, characterized in that: A force transmission strip (3) is cast on the bottom plate (7), and the force transmission strip (3) is inside the pit and abuts against the pit retaining structure (1).