Deep foundation pit support three-dimensional supporting system

Abstract

The utility model discloses a deep foundation pit support three-dimensional supporting system, a support structure of a deep foundation pit comprises support piles, a waist beam is arranged on the support piles, the three-dimensional supporting system comprises stand columns and a horizontal prestress supporting system, the horizontal prestress supporting system supports the waist beam, and the stand columns are arranged on the waist beam. A compensation assembly is arranged between the waist beam and the support pile, one end of the compensation assembly is connected with the embedded assembly of the support pile, the other end of the compensation assembly is connected with the waist beam, and the compensation assembly is used for compensating position deviation between the support pile and the waist beam. The row piles can be adopted as a deep foundation pit enclosure structure, the compensation assembly is connected to the embedded assembly, then the compensation assembly is connected with the waist beam, deviation between the embedded assembly and the waist beam is adapted by adjusting the compensation assembly, and therefore prestress exerted on the waist beam is transmitted to the enclosure structure in a balanced mode.

Description

Technical Field

[0001] The utility model relates to a three-dimensional supporting system for deep foundation pit enclosure. Background Art

[0002] Deep foundation pit engineering generally refers to the earthwork excavation, support, and dewatering engineering of foundation pits (trench) with an excavation depth exceeding 5m (including 5m). Currently, the commonly used deep foundation pit support forms include gravity cement soil wall support structure, pile support structure, soil nail support structure, etc. Among them, the deep foundation pit support structure includes foundation pit enclosure and support system, and the enclosure system is a retaining structure. After the foundation pit is excavated, the soil layer on one side of the retaining structure is hollowed out, and the retaining structure is subjected to the horizontal side pressure of the soil body. Therefore, a support system must be set on the side where the soil layer is excavated. In recent years, prestressed composite support systems have developed rapidly. The Chinese invention patent with publication number CN117803000A discloses a deep foundation pit support construction method under complex environment, which adopts a prestressed fish belly beam combined support system for support. The support system applies prestress to the waist beam, and the waist beam is fixed to the enclosure structure. For enclosures using piles, the waist beam is fixed to the pile. However, there are deviations between the designed positions and the pile construction process. The settlement and drainage of the soil may also cause certain deviations in the pile positions, causing some piles to be located close to or far away from the waist beam. As a result, the prestress applied to the waist beam is not evenly transmitted to the piles, resulting in excessive local stress on the enclosure. Summary of the invention

[0003] In view of the above shortcomings, the purpose of the utility model is to provide a three-dimensional support system that better matches the deep foundation pit pile enclosure.

[0004] To this end, the utility model provides a three-dimensional support system for deep foundation pit enclosure, wherein the enclosure structure of the deep foundation pit includes supporting piles, a waist beam is arranged on the supporting piles, the three-dimensional support system includes columns and a horizontal prestressed support system, the horizontal prestressed support system supports the waist beam, a compensation component is provided between the waist beam and the supporting piles, one end of the compensation component is connected to the embedded component of the supporting piles, and the other end is connected to the waist beam, and the compensation component is used to compensate for the position deviation between the supporting piles and the waist beam.

[0005] Furthermore, the embedded component includes a connecting section, and the compensation component includes a fixing plate, a vertical connecting plate is provided on the surface of the fixing plate, and a plurality of matching groups of through holes are provided on the connecting plate and the connecting section, and high-strength bolts pass through the corresponding groups of through holes to fix the connecting plate and the connecting section.

[0006] Furthermore, the fixed plate is fixed to the force transmission member, the force transmission member is fixed to the waist beam, and a limiting pad is provided between the force transmission member and the fixed plate.

[0007] Furthermore, the shape of the limiting pad is a concave shape, and the thickness of the bottom surface and two side surfaces of the limiting pad are different. The bottom surface or one of the side surfaces of the limiting pad is padded between the force transmission member and the fixed plate and fixed with high-strength bolts, and the other two surfaces of the limiting pad are fixed to the waist beam.

[0008] Furthermore, a triangular support member is provided below the waist beam and the compensation assembly.

[0009] Furthermore, the support piles are cast-in-place steel pipe piles, a portion of the embedded components is disposed in concrete, and a connecting section of the embedded components is disposed in a partition cavity of the cast-in-place steel pipe piles.

[0010] Furthermore, a steel cage is arranged in the steel pipe cast-in-place pile, a T-shaped steel embedded component is fixed in the steel cage, and the connecting section is fixed in a fan-shaped steel box, and the outer surface of the steel box is in contact with the inner wall of the steel pipe of the steel pipe cast-in-place pile.

[0011] A steel groove may also be provided in the steel pipe cast-in-place pile, the opening section of the steel groove cooperates with the inner wall of the steel pipe, and the connecting section is provided in the separation cavity formed by the steel groove.

[0012] Furthermore, the horizontal prestressed support system includes braces, angle braces and prestressed fish belly beams, wherein the prestressed fish belly beams are symmetrically installed with steel strands, and the symmetry, angle braces and prestressed fish belly beams are supported on the waist beam and are provided with prestressed devices.

[0013] Furthermore, the three-dimensional support system includes two or more layers of horizontal prestressed support systems, and the vertical support system includes columns and supports the horizontal prestressed support system.

[0014] The beneficial effects of the utility model are:

[0015] (1) A three-dimensional support system for deep foundation pit enclosure of the utility model includes a horizontal prestressed support system and a vertical support system. The horizontal prestressed support system is supported on a waist beam, and the waist beam adopts H-shaped steel. The foundation pit enclosure of the utility model can adopt a row of piles, and an embedded component is arranged at a predetermined position of the support pile. The pre-embedded component is connected to the compensation component, and the compensation component is connected to the waist beam. By adjusting the compensation component to adapt to the deviation between the pre-embedded component and the waist beam, the prestress applied to the waist beam is more evenly transferred to the enclosure structure.

[0016] (2) In a specific embodiment of the utility model, a steel pipe cast-in-place pile is used. A steel box or a steel trough is embedded in the steel pipe cast-in-place pile to form a partition cavity. The connecting section of the embedded component is arranged in the partition cavity. When concrete is poured into the steel pipe cast-in-place pile, a part of the embedded component is poured in the concrete, and the connecting section is arranged in the partition cavity. When the foundation pit is excavated to the corresponding position, the embedded position can be opened to expose the embedded component. The opening method can be achieved by cutting the corresponding steel pipe, the outer wall of the partition cavity or setting an openable cover at the corresponding position, which can prevent the embedded component from being directly exposed to the soil and causing negative effects such as rust and erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the pile support system is shown in FIG.

[0018] Figure 2 It is a schematic diagram of a specific embodiment of the support system of the utility model;

[0019] Figure 3 It is a side view schematic diagram of the waist beam and the compensation component;

[0020] Figure 4 is a schematic diagram of the compensation components;

[0021] Figure 5 is a schematic diagram of a limiting pad;

[0022] Figure 6 Schematic diagram of cast-in-place steel pipe piles and embedded components.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. deep foundation pit; 2. supporting piles; 3. crown beam; 4. waist beam; 5. retaining wall; 6. bracing; 7. fish belly beam; 8. steel strand; 9. angle brace; 10. prestressed device; 11. column; 12. connector; 13. force box; 14. compensation assembly; 141. fixing plate; 142. connecting plate; 15. embedded assembly; 151. connecting section; 16. limiting pad; 17. steel pipe cast-in-place pile; 18. steel box; 19. triangular support assembly. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0025] Reference Figures 1 to 6As shown, the utility model is a three-dimensional support system for deep foundation pit enclosure, the enclosure structure of the deep foundation pit 1 includes support piles 2, and a waist beam 4 is arranged on the support piles 2. The three-dimensional support system includes columns 11 and a horizontal prestressed support system, and the horizontal prestressed support system supports the waist beam 4. A compensation component 14 is arranged between the waist beam 4 and the support piles 2. One end of the compensation component 14 is connected to the embedded component 15 of the support pile 2, and the other end is connected to the waist beam 4. The compensation component 14 is used to compensate for the position deviation between the support pile 2 and the waist beam 4. Figure 1 As shown, a row pile support structure is adopted. With the existing construction equipment performance and technical level, under normal circumstances, the pile position deviation is controlled within 50mm, and the pile verticality deviation is controlled within 0.5%. The support piles 2 can be arranged at intervals or continuously. When the intervals are used, the water-stop curtain is overlapped, and the water-stop curtain and the support piles 2 form a retaining wall 5. The upper end of the support pile 2 is provided with a crown beam 3 for connection, and the pile body of the support pile 2 is provided with a plurality of waist beams 4. Figure 2 As shown, the horizontal prestressed support system includes a brace 6, an angle brace 9 and a prestressed fish belly beam 7. The brace 6 is arranged in the middle of the enclosure wall 5. The prestressed fish belly beam 7 is symmetrically installed with steel strands 8. The brace, angle brace 9 and prestressed fish belly beam 7 are supported on the waist beam 4 and are provided with a prestressing device 10. The prestressing device 10 can be a pressurized telescopic device, such as a jack. Monitoring devices such as pressure sensors and displacement sensors can also be provided. Figure 3 As shown, the waist beam 4 is an H-shaped steel, and a compensation component 14 is connected between the waist beam 4 and the embedded components of the support pile 2. The length of the compensation component can be adjusted to adapt to the pile position deviation of the support pile 2. A triangular support component 19 is provided below the compensation component 14 and the waist beam 4. In this embodiment, a corbel is used as a support. The above-mentioned three-dimensional support system also includes a vertical support system and two or more layers of horizontal prestressed support systems. The vertical support system includes a column 11 and supports the horizontal prestressed support system. The vertical support system mainly includes a column 11 and a connector. The horizontal prestressed support system is also provided with a connector 12. The column 11 and the support beam of the horizontal prestressed support system are both steel sections.

[0026] In the above embodiment, referring to Figure 4As shown, the compensation component 14 includes a fixing plate 141, which is fixed to a side wing plate or a force transmission member of the waist beam 4 by high-strength bolts, and the embedded component 15 includes a connecting section 151, which can be a web of an H-shaped steel, and two vertical connecting plates 142 are provided on the surface of the fixing plate 141, and the distance between the two connecting plates 142 matches the thickness of the connecting section 151. The connecting plate 142 and the connecting section 151 are provided with a plurality of matching groups of through holes, and the high-strength bolts pass through the corresponding groups of through holes to fix the connecting plate 142 and the connecting section 151. In this embodiment, the number of through hole groups on the connecting section 151 is greater than that on the connecting plate 142, or the number of through hole groups on the connecting plate 142 is greater than that on the connecting section 151, so that when the connecting plate 142 and the connecting section 151 are fixed by different through holes, the distance between the fixing plate 141 and the embedded component 15 can be adjusted. In this embodiment, the setting of the through holes affects the strength of the connecting plate 142 and the connecting section 151 to a certain extent. Strip or cross-shaped reinforcing ribs can be set on the surface between the through holes to enhance the structural strength of the compensation component 14. The above-mentioned fixed plate 141 can also adopt two L-shaped plates, which are respectively arranged on both sides of the connecting section 151 to achieve similar functions. The adjustment range of the above-mentioned compensation component 14 is limited by the spacing between the two through holes. Preferably, a pad can be set on the fixed plate 141 to adjust the small gap, while the above-mentioned compensation component 14 is used for adjusting the larger spacing. Further, the above-mentioned pad can adopt a concave-shaped limiting pad 16, the bottom surface and the two side surfaces of the limiting pad 16 are different in thickness, the bottom surface or one of the side surfaces of the limiting pad 16 is padded between the force transmission member and the fixed plate 141 and fixed with high-strength bolts, and the other two surfaces of the limiting pad 16 are fixed to the waist beam 4, and the other side of the waist beam 4 is connected to the force box 13 and the prestressed device 10. The limiting pad 16 has three walls, and the thickness of each wall can be reasonably set according to the spacing of the through holes. A wall (side or bottom) with a thickness closest to the gap can be used to pad the surface of the fixing plate 141 and fixed with high-strength bolts. Taking the cooperation between the limiting pad 16 and the waist beam 4 as an example, the concave space formed by the limiting pad 16 cooperates with the waist beam 4, and reinforcing ribs are generally arranged at equal intervals between the two wing plates of the waist beam 4. A reinforcing plate can be welded between the two wing plates, and bolt holes are arranged on the reinforcing plate. The other two surfaces of the limiting pad 16 and the reinforcing plate are connected with high-strength bolts to strengthen and limit the waist beam 4 from deflection under the action of prestress.

[0027] In the above embodiment, the support pile 2 is a steel pipe cast-in-place pile 17, and the embedded component 15 is a T-shaped steel, a part of which is arranged in concrete, and the connecting section 151 of the embedded component 15 is arranged in the partition cavity of the steel pipe cast-in-place pile 17. The embedded component 15 is first fixed to the steel cage (not shown in the figure), and the connecting section 151 is fixed in the fan-shaped steel box 18. The steel box 18 is fixed in a position so that its outer surface fits the inner wall of the steel pipe of the steel pipe cast-in-place pile 17. Then the steel cage is placed in the steel pipe, and concrete is poured. The connecting section 151 used to connect with the compensation component 14 is separated from the concrete, avoiding the connection section 151 of the embedded component 15 to be arranged outside the steel pipe, preventing deformation that is easy to occur during construction and rust caused by the influence of groundwater, etc. When the foundation pit is excavated to the predetermined position, the connecting section 151 can be exposed by cutting off the corresponding outer wall of the steel pipe. Alternatively, a seal cover that can be opened and closed may be reserved at the corresponding position of the steel pipe, and the cover may be fixed with bolts. After the foundation pit is excavated, the bolts may be cut off or screwed out to open the cover to expose the connection section 151. The steel box 18 may also be replaced by a steel trough, wherein the steel pipe cast-in-place pile 17 is provided with a steel trough, and the opening section of the steel trough cooperates with the inner wall of the steel pipe, and the connection section 151 is provided in the partition cavity formed by the steel trough.

[0028] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A three-dimensional support system for deep foundation pit enclosure, wherein the enclosure structure of the deep foundation pit comprises support piles, a waist beam is arranged on the support piles, the three-dimensional support system comprises columns and a horizontal prestressed support system, and the horizontal prestressed support system supports the waist beam, characterized in that: A compensation component is provided between the waist beam and the supporting piles, one end of the compensation component is connected to the embedded component of the supporting piles, and the other end is connected to the waist beam, and the compensation component is used to compensate for the position deviation between the supporting piles and the waist beam.

2. A three-dimensional support system for deep foundation pit protection according to claim 1, characterized in that: The embedded component includes a connecting section, and the compensation component includes a fixing plate, a vertical connecting plate is provided on the surface of the fixing plate, and a plurality of matching groups of through holes are provided on the connecting plate and the connecting section. High-strength bolts pass through the corresponding groups of through holes to fix the connecting plate and the connecting section.

3. A three-dimensional support system for deep foundation pit protection according to claim 2, characterized in that: The fixing plate is fixed to the force transmission member, the force transmission member is fixed to the waist beam, and a limiting pad is provided between the force transmission member and the fixing plate.

4. A three-dimensional support system for deep foundation pit protection according to claim 3, characterized in that: The limiting pad is in the shape of a concave letter "U", and the thickness of the bottom surface and two side surfaces of the limiting pad are different. The bottom surface or one of the side surfaces of the limiting pad is padded between the force transmission member and the fixed plate and fixed with high-strength bolts, and the other two surfaces of the limiting pad are fixed to the waist beam.

5. A three-dimensional support system for deep foundation pit protection according to any one of claims 1 to 4, characterized in that: A triangular support member is arranged below the waist beam and the compensation assembly.

6. A three-dimensional support system for deep foundation pit protection according to claim 5, characterized in that: The supporting pile is a steel pipe cast-in-place pile, a part of the embedded component is arranged in concrete, and the connecting section of the embedded component is arranged in the partition cavity of the steel pipe cast-in-place pile.

7. A three-dimensional support system for deep foundation pit protection according to claim 6, characterized in that: A steel cage is arranged in the steel pipe cast-in-place pile, a T-shaped steel embedded component is fixed in the steel cage, and the connecting section is fixed in a fan-shaped steel box, and the outer surface of the steel box is in contact with the inner wall of the steel pipe of the steel pipe cast-in-place pile.

8. A three-dimensional support system for deep foundation pit protection according to claim 6, characterized in that: A steel groove is arranged in the steel pipe cast-in-place pile, the opening section of the steel groove matches with the inner wall of the steel pipe, and the connecting section is arranged in the separation cavity formed by the steel groove.

9. A three-dimensional support system for deep foundation pit protection according to claim 7, characterized in that: The horizontal prestressed support system includes braces, angle braces and prestressed fish belly beams, wherein the prestressed fish belly beams are symmetrically installed with steel strands, and the symmetric, angle braces and prestressed fish belly beams are supported on the waist beam and are provided with prestressed devices.

10. A three-dimensional support system for deep foundation pit protection according to claim 7, characterized in that: The three-dimensional support system includes two or more layers of horizontal prestressed support systems, and the vertical support system includes columns and supports the horizontal prestressed support system.

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