Beam string structure steel truss structure and concrete structure combined foundation pit supporting system

Abstract

The utility model relates to a string beam steel truss structure and concrete structure combined foundation pit supporting system, which belongs to the technical field of building construction and comprises a concrete structure system, a steel upright post, a steel truss structure system and a string beam structure system. Wherein the concrete structure system comprises a top beam and a waist beam which are arranged on the inner side of an enclosing purlin, a concrete platform is formed by pouring on the horizontal plane where the top beam is located, and the concrete platform is used as a storage yard or a road; the steel columns are arranged at the bottom of the concrete platform; the steel truss structure system comprises multiple sets of steel trusses, and the two ends of each steel truss are connected to the adjacent or opposite waist beams correspondingly. The beam string structure system comprises multiple sets of beam string structures, and end pull rods at the two ends of each beam string structure are connected to the same waist beam. The foundation pit supporting system can better meet the space requirement of an actual construction site, and necessary site conditions are provided for construction material stacking, construction machinery, personnel passing and the like.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and in particular relates to a foundation pit support system combining a tensioned steel truss structure and a concrete structure. Background Technology

[0002] In the field of building construction, foundation pit support is a crucial step in ensuring the safety of underground structure construction and the surrounding environment. This is especially true for deep foundation pit projects in urban areas, such as high-rise buildings or subway construction, where there are major traffic arteries, existing buildings, pipelines, and other structures nearby. Protecting these surrounding facilities for safe operation is paramount, making foundation pit support technology a subject of great interest.

[0003] In the prior art, Chinese invention patent application CN110219306A discloses a composite foundation pit support system of concrete and metal structures. This patent constructs a composite foundation pit support system using concrete beams, a truss support system, and a combined tensioned beam system, which can meet basic foundation pit support requirements. However, in actual construction sites, the problem of insufficient road and storage space is often encountered, and this patent cannot solve this problem.

[0004] Therefore, how to solve the problem of insufficient construction roads and storage space in the foundation pit is a technical problem that urgently needs to be solved. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a combined foundation pit support system of tensioned steel truss structure and concrete structure. By setting up a concrete platform, the concrete platform can be directly used as a storage yard or road, effectively solving the problem of insufficient road and storage yard space faced by foundation pit construction in existing technologies.

[0006] This utility model provides a combined foundation pit support system of tensioned steel truss structure and concrete structure, wherein the foundation pit sidewall is provided with walers, including:

[0007] The concrete structure system includes a cap beam and a waist beam set inside the waler. The cap beam is set at the top of the waler, and multiple waist beams are set downward from the cap beam. A support beam is also set on the horizontal plane where the cap beam is located, and a concrete platform is poured on the horizontal plane to form a concrete platform. The concrete platform is set around the top of the waler and in the middle, and is used as a storage yard or road.

[0008] Steel columns are installed at the bottom of the concrete platform to support it.

[0009] The steel truss structure system includes multiple sets of steel trusses, with both ends of the steel trusses connected to adjacent or opposite waist beams, and the steel trusses are also connected to steel columns;

[0010] The tensioned beam structure system includes multiple sets of tensioned beams. The end tie rods at both ends of the tensioned beams are respectively connected to the same waist beam. The tensioned beams are set between two sets of steel trusses connected to the same waist beam. A strut perpendicular to the waist beam is provided between the middle of the tensioned beam and the waist beam. The tensioned beams are connected to steel columns.

[0011] This technical solution effectively solves the problem of insufficient road and storage space faced by foundation pit construction in the prior art by setting up a concrete platform, which can be directly used as a storage yard or road.

[0012] In some embodiments, the groin beam is supported, and the groin beam is connected to the steel truss or tensioned beam through the supports. This technical solution can ensure that the load of the steel truss and tensioned beam is effectively transferred to the groin beam, improving the overall structural stability and coordinated load-bearing performance.

[0013] In some embodiments, the support includes embedded parts for connecting the tensioned beam, and the end tie rods of the tensioned beam are connected to the embedded parts. This technical solution, through the inclusion of embedded parts, enhances the joint strength and prevents localized damage to the chord beam during prestressing of the tensioned beam.

[0014] In some embodiments, steel brackets are provided on the steel columns, and the steel truss is connected to both the steel truss and the tensioned beam via these brackets. This technical solution optimizes the load transfer path, reduces stress concentration at nodes, and facilitates construction, installation, and adjustment.

[0015] In some embodiments, the tensioned beam is further provided with a support frame for connecting the steel bracket. This technical solution can enhance the connection stiffness between the tensioned beam and the steel bracket, and prevent node slippage under prestressing.

[0016] In some embodiments, the support frame includes a main support and a secondary support. The secondary support is arranged parallel to the strut and fixedly connected to the strut, while the main support is arranged perpendicular to the secondary support and connected to the steel bracket. This technical solution can form a multi-layered force-bearing system.

[0017] In some embodiments, the steel truss is provided with truss support beams for supporting the steel truss. The truss support beams are vertically connected to the steel truss in the same horizontal plane and are connected to steel brackets. This technical solution improves the out-of-plane stability of the steel truss by setting truss support beams, and at the same time, the load is transferred to the steel columns through the steel brackets, preventing the truss from twisting and becoming unstable.

[0018] In some embodiments, cross braces are provided between adjacent steel trusses on the same horizontal plane for reinforcement. This technical solution can enhance the lateral connection between trusses and improve the structure's resistance to lateral displacement.

[0019] In some embodiments, diagonal bracing is provided between adjacent steel trusses on the same horizontal plane for reinforcement. This technical solution, through the installation of diagonal bracing, forms a triangular stabilizing system, significantly improving the shear and torsional resistance of the trusses.

[0020] In some embodiments, a prestressing device is provided between the strut and the lumbar beam. This technical solution optimizes the structural stress state, reduces deformation, and improves load-bearing capacity by actively applying prestress to adjust the internal force of the strut.

[0021] Based on the above solution, the combined foundation pit support system of tensioned beam steel truss structure and concrete structure in this embodiment of the present invention effectively solves the problem of insufficient road and storage space in foundation pit construction in the prior art by setting up a concrete platform, which can be directly used as a storage yard or road. It can better adapt to the space requirements of the actual construction site and provide the necessary site conditions for the storage of construction materials and the passage of construction machinery and personnel. In addition, the steel truss structure system has high cross-sectional stiffness and strong bending and shear resistance, which can effectively bear several loads at the edge of the road and avoid local deformation. The tensioned beam structure system can significantly reduce mid-span deflection and has a lighter self-weight. The combination of the concrete structure system, the steel truss structure system and the tensioned beam structure system can adapt to different foundation pit construction environments and requirements, ensuring the safety of underground structure construction and the surrounding environment of the foundation pit. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the combined foundation pit support system of tensioned steel truss structure and concrete structure in an embodiment of this utility model;

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0025] Figure 3 for Figure 1 Enlarged schematic diagram of part B.

[0026] In the picture:

[0027] 1. Waler; 2. Concrete structural system; 3. Steel columns; 4. Steel truss structural system; 5. Tensioned beam structural system;

[0028] 201. Crown beam; 202. Waist beam; 203. Support beam; 204. Concrete platform; 205. Support;

[0029] 301. Steel bracket;

[0030] 401. Steel truss; 402. Truss support beam; 403. Horizontal web member; 404. Diagonal web member;

[0031] 501. Support rod; 502. End tie rod; 503. Tensioned beam; 504. Main support; 505. Secondary support; 506. Prestressing pressurization equipment; 507. Secondary filling and pouring area. Detailed Implementation

[0032] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] like Figures 1-3As shown, in one embodiment of the combined foundation pit support system of tensioned beam steel truss structure and concrete structure of this utility model, a waler 1 is provided on the side wall of the foundation pit. The combined foundation pit support system of tensioned beam steel truss structure and concrete structure includes a concrete structure system 2, steel columns 3, a steel truss structure system 4, and a tensioned beam structure system 5. Among them, the concrete structure system 2 includes a cap beam 201 and waist beams 202 set inside the waler 1. The cap beam 201 is set at the top of the waler 1, and multiple waist beams 202 are provided downward from the cap beam 201. A support beam 203 is also provided on the horizontal plane where the cap beam 201 is located, and a concrete platform 204 is formed by pouring concrete on the horizontal plane. The concrete platform 204 is set on the top of the waler 1. The perimeter and center are used as storage yards or roads; steel columns 3 are set at the bottom of the concrete platform 204 to support the concrete platform 204; the steel truss structure system 4 includes multiple sets of steel trusses 401, with both ends of the steel trusses 401 connected to adjacent or opposite waist beams 202, and the steel trusses 401 are also connected to the steel columns 3; the tensioned beam structure system 5 includes multiple sets of tensioned beams 503, with end tie rods 502 at both ends of the tensioned beams 503 connected to the same waist beam 202, and the tensioned beams 503 are set between two sets of steel trusses 401 connected to the same waist beam 202; a strut 501 perpendicular to the waist beam 202 is provided between the middle of the tensioned beam 503 and the waist beam 202; the tensioned beams 503 are connected to the steel columns 3.

[0036] In the above illustrative embodiment, the combined foundation pit support system of tensioned beam steel truss structure and concrete structure, by setting up a concrete platform 204, directly uses the concrete platform 204 as a storage yard or road, effectively solving the problem of insufficient road and storage space faced by foundation pit construction in the prior art. It can better adapt to the space requirements of the actual construction site and provide the necessary site conditions for the storage of construction materials and the passage of construction machinery and personnel. In addition, the steel truss structure system 4 has high cross-sectional stiffness and strong bending and shear resistance, which can effectively bear several loads at the edge of the road and avoid local deformation. The tensioned beam structure system 5 can significantly reduce mid-span deflection and has a lighter self-weight. The combination of the concrete structure system 2, the steel truss structure system 4, and the tensioned beam structure system 5 can adapt to different foundation pit construction environments and requirements, ensuring the safety of underground structure construction and the surrounding environment of the foundation pit.

[0037] Furthermore, concrete is poured inside the steel column 3. The steel-concrete composite structure significantly improves the compressive and bending stiffness of the steel column 3, while also enhancing its fire resistance and corrosion resistance, extending its service life and reducing later maintenance costs.

[0038] In some embodiments, such as Figure 2As shown, the groin beam 202 is provided with a support 205, and the groin beam 202 is connected to the steel truss 401 or the tensioned beam 503 through the support 205. The support 205 provides a reliable force transmission node, ensuring that the loads of the steel truss 401 and the tensioned beam 503 are effectively transferred to the groin beam 202, thereby improving the stability and coordinated load-bearing performance of the overall structure.

[0039] In some embodiments, the support 205 is provided with an embedded part for connecting the tensioned beam 503, and the end tie rod 502 of the tensioned beam 503 is connected to the embedded part. By setting the embedded part, the strength of the joint can be enhanced, local damage to the chord beam 202 can be avoided when the tensioned beam 503 is prestressed, and the accuracy and durability of the tie rod anchorage can be ensured.

[0040] In some embodiments, such as Figure 2 As shown, the steel column 3 is equipped with a steel bracket 301, and the steel truss 401 is connected to the steel truss 401 and the tensioned beam 503 through the steel bracket 301. The steel bracket 301 serves as a rigid connection point, optimizing the load transfer path, reducing stress concentration at nodes, and facilitating construction, installation, and adjustment.

[0041] In some embodiments, the tension beam 503 is further provided with a support frame for connecting the steel bracket 301. The support frame enhances the connection stiffness between the tension beam 503 and the steel bracket 301, prevents node slippage under prestress, and improves the overall structural integrity.

[0042] In some embodiments, such as Figure 3 As shown, the support frame includes a main support 504 and a secondary support 505. The secondary support 505 is arranged parallel to the strut 501 and fixedly connected to the strut 501. The main support 504 is arranged perpendicular to the secondary support 505 and connected to the steel bracket 301. The secondary support 505 is fixed to the strut 501 to enhance local stability, and the main support 504 is connected to the steel bracket 301 to ensure smooth force flow, forming a multi-layered force-bearing system.

[0043] In some embodiments, such as Figure 3 As shown, the steel truss 401 is provided with a truss support beam 402 for supporting the steel truss 401. The truss support beam 402 is perpendicularly connected to the steel truss 401 in the same horizontal plane, and the truss support beam 402 is connected to the steel bracket 301. The setting of the truss support beam 402 can improve the out-of-plane stability of the steel truss 401, and at the same time, the load is transferred to the steel column 3 through the steel bracket 301, avoiding the torsional instability of the truss.

[0044] In some embodiments, such as Figure 3 As shown, horizontal web members 403 are provided between adjacent steel trusses 401 in the same horizontal plane for reinforcement. The horizontal web members 403 enhance the lateral connection between trusses, improve the structure's resistance to lateral displacement, and are suitable for working conditions that bear large horizontal loads.

[0045] In some embodiments, such as Figure 3 As shown, diagonal web members 404 are provided between adjacent steel trusses 401 on the same horizontal plane for reinforcement. The diagonal web members 404 form a triangular stability system, which significantly improves the shear and torsional resistance of the trusses and is suitable for large spans or areas with frequent dynamic loads.

[0046] In some embodiments, such as Figure 3 As shown, a prestressing device 506 is provided between the strut 501 and the lumbar beam 202. By actively applying prestress to adjust the internal force of the strut 501, the stress state of the structure is optimized, deformation is reduced, and the load-bearing capacity is improved.

[0047] Furthermore, such as Figure 3 As shown, a secondary filling and pouring zone 507 is provided between the prestressed pressurizing device 506 and the lintel 202. The secondary filling and pouring zone 507 alleviates local stress concentration, protects the pressurizing device, and enhances the overall integrity of the joint to prevent concrete cracking.

[0048] The following is combined Figures 1-3 The construction method of one embodiment of the composite foundation pit support system of tensioned beam steel truss structure and concrete structure of this utility model is described below:

[0049] S1, the site is leveled to the design elevation, the points are marked according to the design drawings, and steel columns 3 are installed; after the steel columns 3 are installed to the design elevation, concrete is poured into the steel columns 3.

[0050] S2, after excavating to the bottom elevation of the first-floor capping beam 201, proceed with the reinforcement binding, formwork erection, and concrete pouring of capping beam 201, support beam 203, and concrete platform 204; proceed to the next step after the design strength is reached.

[0051] S3, continue excavating downwards. After excavating to the lower working face elevation, carry out the construction of steel reinforcement binding of waist beam 202 and support 205, formwork erection, pre-embedding of embedded parts, and concrete pouring; weld steel bracket 301 above steel column 3 and assemble the steel truss structure system.

[0052] S4, after the wainscoting 202 reaches its strength, the tensioned beam structure system 5 and the steel truss structure system 4 will be installed;

[0053] S5, carry out the secondary filling and pouring area 507 construction of the tensioned beam structure system 5 and set up the prestressing pressurization equipment 506;

[0054] S6: Determine whether the excavation has reached the design bottom elevation; otherwise, repeat steps S3, S4, and S5.

[0055] Through the description of several embodiments of the combined foundation pit support system of tensioned beam steel truss structure and concrete structure of this utility model, it can be seen that the embodiments of the combined foundation pit support system of tensioned beam steel truss structure and concrete structure of this utility model have at least one or more of the following advantages:

[0056] 1. The tensioned steel truss structure and concrete structure combined foundation pit support system provided by this utility model, by setting up a concrete platform 204, can directly use the concrete platform 204 as a storage yard or road, which effectively solves the problem of insufficient road and storage yard space faced by foundation pit construction in the prior art, and can better adapt to the space requirements of the actual construction site, providing the necessary site conditions for the storage of construction materials and the passage of construction machinery and personnel.

[0057] 2. In the combined foundation pit support system of tensioned beam steel truss structure and concrete structure provided by this utility model, the steel truss structure system 4 has high cross-sectional stiffness and strong bending and shear resistance, which can effectively bear several loads at the road edge and avoid local deformation; the tensioned beam structure system 5 can significantly reduce mid-span deflection and has a lighter self-weight. The combination of concrete structure system 2, steel truss structure system 4, and tensioned beam structure system 5 can adapt to different foundation pit construction environments and needs, ensuring the safety of underground structure construction and the surrounding environment of the foundation pit.

[0058] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A combined foundation pit support system of tensioned steel truss structure and concrete structure, wherein the foundation pit sidewalls are provided with walers, characterized in that, include: The concrete structure system includes a cap beam and a waist beam set inside the waler. The cap beam is set at the top of the waler, and multiple waist beams are set downward from the cap beam. A support beam is also set on the horizontal plane where the cap beam is located, and a concrete platform is poured on the horizontal plane to form a concrete platform. The concrete platform is set around the top of the waler and in the middle, and is used as a storage yard or road. Steel columns are installed at the bottom of the concrete platform to support it. The steel truss structure system includes multiple sets of steel trusses, with both ends of the steel trusses connected to adjacent or opposite waist beams, and the steel trusses are also connected to steel columns; The tensioned beam structure system includes multiple sets of tensioned beams. The end tie rods at both ends of the tensioned beams are respectively connected to the same waist beam. The tensioned beams are set between two sets of steel trusses connected to the same waist beam. A strut perpendicular to the waist beam is provided between the middle of the tensioned beam and the waist beam. The tensioned beams are connected to steel columns.

2. The beam string steel truss structure and concrete structure combined foundation pit support system according to claim 1, characterized in that, The waist beam is equipped with supports, and the waist beam is connected to the steel truss or tensioned beam through the supports.

3. The beam string steel truss structure and concrete structure combined foundation pit support system according to claim 2, characterized in that, The support is equipped with embedded parts for connecting the tensioned beam, and the end tie rods of the tensioned beam are connected to the embedded parts.

4. The beam string steel truss structure and concrete structure combined foundation pit support system of claim 1, wherein, The steel columns are equipped with steel brackets, and the steel truss is connected to the steel truss and the tensioned beam respectively through the steel brackets.

5. The beam string steel truss structure and concrete structure combined foundation pit support system according to claim 4, characterized in that, The tension beam is also equipped with a support frame for connecting the steel brackets.

6. The beam string steel truss structure and concrete structure combined foundation pit support system according to claim 5, characterized in that, The support frame includes a main support and a secondary support. The secondary support is set parallel to the strut and fixedly connected to the strut, while the main support is set perpendicular to the secondary support and connected to the steel bracket.

7. The beam string steel truss structure and concrete structure combined foundation pit support system according to claim 4, characterized in that, The steel truss is equipped with truss support beams for supporting the steel truss. The truss support beams are vertically connected to the steel truss in the same horizontal plane, and the truss support beams are connected to the steel brackets.

8. The beam string steel truss structure and concrete structure combined foundation pit support system of claim 1, wherein, Horizontal bracing is provided between adjacent steel trusses on the same horizontal plane for reinforcement.

9. The combined foundation pit support system of tensioned steel truss structure and concrete structure according to claim 1 or 8, characterized in that, Diagonal bracing is provided between adjacent steel trusses on the same horizontal plane for reinforcement.

10. The beam string steel truss structure and concrete structure combined foundation pit support system of claim 1, wherein, A prestressing device is installed between the strut and the waist beam.

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