A beam string composite structure assisted by a concrete component

Abstract

This utility model discloses a tensioned beam composite structure supported by concrete components. The tensioned beam consists of an upper chord concrete beam, several lower chord steel tie rods, and several struts; the concrete components consist of a V-shaped concrete beam, concrete corbels, and concrete supports; the upper chord concrete beam is horizontally positioned at the foundation pit; the lower chord steel tie rods and struts form an arched structure and support the upper chord concrete beam, creating a support area; the V-shaped concrete beam extends into the support area of ​​the tensioned beam, sharing the load on the tensioned beam. This utility model reduces the load on the tensioned beam by using concrete supports and corbels to bear part of the load, significantly reducing its support deformation and improving the stability of the foundation pit support. An opening is provided at the intersection of the V-shaped concrete beam and the lower chord steel tie rods, physically separating them into independent load-bearing systems, eliminating additional stress interference, clarifying the force transmission path, and facilitating calculation and maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of building construction and relates to a tensioned beam composite structure supported by concrete components. Background Technology

[0002] To ensure the safety of underground structure construction and the surrounding environment of the foundation pit, it is necessary to adopt support, reinforcement, and protection measures for the sidewalls and surrounding environment of the foundation pit. Whether it is a deep foundation pit project for high-rise buildings or subway construction, since most excavations are carried out in urban areas, the area around the foundation pit usually contains various structures such as main roads, existing buildings, or pipelines. To ensure the safety of the surrounding environment of the foundation pit, and to save construction time and costs, the tensioned beam structure system is widely used due to its unique mechanical properties and structural characteristics.

[0003] When the soil layer of the foundation pit is very poor or very deep, the load borne by the tensioned beam is large, and the stiffness and bearing capacity of the existing large-span tensioned beam cannot meet the requirements of this application scenario.

[0004] As urban construction progresses, the scale and shape of foundation pits are constantly expanding, placing higher demands on the performance of foundation pit support structures. Traditional foundation pit support systems have limitations. Concrete supports have high rigidity but are heavy, difficult to dismantle, inconvenient for reuse, and have long construction cycles; steel structure supports are lightweight and easy to install, but their stability and load-bearing capacity face challenges in large-span applications. Utility Model Content

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a concrete component and a tensioned beam structure. The V-shaped concrete beam extends into the support range of the tensioned beam, sharing some of the load. Intersection openings are provided at the intersection of the V-shaped concrete beam and the steel tie rod, ensuring that the two materials are subjected to independent forces without affecting each other. The tensioned beam structure integrates rigid components (such as concrete beams and steel beams) and flexible cables. By applying prestress to the cables, the overall structural stress is more rationally distributed, effectively improving load-bearing capacity and spanning ability. For example, in the foundation pit engineering of large commercial buildings or underground parking lots, it can achieve large-span support, reduce internal support columns, and provide more open space for subsequent construction.

[0006] To achieve the above objectives, this utility model provides the following technical solution: One of the technical solutions of this utility model provides a tensioned beam composite structure with auxiliary support from concrete components, which consists of concrete components and a tensioned beam; the tensioned beam consists of an upper chord concrete beam, several lower chord steel tie rods and several struts; the concrete components consist of a V-shaped concrete beam and concrete supports; The upper chord concrete beam is horizontally positioned at the foundation pit; several lower chord steel tie rods are connected end to end to form an arched structure and support the upper chord concrete beam; several struts are positioned between the upper chord concrete beam and the lower chord steel tie rods; the lower chord steel tie rods and struts form a support area; the concrete support is vertically positioned on the upper chord concrete beam and located on both sides of the arched structure formed by the lower chord steel tie rods; the figure-eight-shaped concrete beam is connected to both sides of the concrete support, and one side of the figure-eight-shaped concrete beam is penetrated by the lower chord steel tie rod, so that the bottom of the figure-eight-shaped concrete beam extends into the arched structure formed by the lower chord steel tie rods.

[0007] Furthermore, the lower chord steel tie rod has n segments, where n is a positive integer ≥ 2. The lower chord steel tie rod has an odd number of segments, with the middle segment placed horizontally and the two outermost segments serving as side tie rods. The bottom of the side tie rods is anchored into the upper chord concrete beam. In some specific embodiments of the utility model, n is 5, meaning there are an odd number of lower chord steel tie rod segments, in which case the middle lower chord steel tie rod is in a horizontal state. In some other embodiments, n is 6, then the connection point of the two middle lower chord steel tie rod segments is the highest point of the entire arched structure.

[0008] Furthermore, the number of struts is n-1, that is, the number of struts is one less than the number of lower chord steel tie rods. The struts are respectively set at the connection of any two lower chord steel tie rods, and the upper end of the strut is hinged to the two connected lower chord steel tie rods. The lower end of the strut is perpendicular to the upper chord concrete beam.

[0009] Furthermore, the lower ends of the two outermost struts are supported on concrete corbels, which are fixed to the upper chord concrete beam.

[0010] Furthermore, the area covered by the lower chord steel tie rod and the strut serves as the support range of the tensioned beam, and the bottom of the V-shaped concrete beam through which the lower chord steel tie rod passes is located within the support range of the tensioned beam.

[0011] Furthermore, the concrete supports are provided in two sets, located on both sides of the arched structure of the tensioned beam. Each set of concrete components has a V-shaped concrete beam extending into the support range of the tensioned beam. One end of the V-shaped concrete beam closer to the tensioned beam is connected to the concrete support, and the other end is connected to the upper chord concrete beam.

[0012] Furthermore, an opening is provided in the V-shaped concrete beam through which the lower chord steel tie rod passes, and a rectangular steel pipe is installed in the opening, through which the lower chord steel tie rod passes.

[0013] Several reinforcing steel sections are provided on the outer sides of the rectangular steel pipe on opposite sides, and the reinforcing steel sections are embedded in the V-shaped concrete beam. Stirrups are also provided inside the reinforcing steel sections, and the stirrups surround the reinforcing steel sections.

[0014] Compared with the prior art, the present invention has at least the following improvements and beneficial effects: (1) Load sharing is coordinated, which significantly improves the resistance to deformation: Addressing the shortcomings of existing large-span tensioned beams in deep foundation pits and varying soil conditions—namely, insufficient stiffness and susceptibility to deformation—this invention innovatively introduces a composite support system formed by concrete components and the tensioned beam. The concrete components extend into the tensioned beam's support area via a V-shaped concrete beam. Leveraging the stable base of the concrete support and the precise contact with the concrete corbels, they directly bear a portion of the vertical loads (such as backfill and construction loads) and horizontal loads (soil pressure) transmitted from the upper chord concrete beam. This load distribution pattern, with the tensioned beam as the primary support and the V-shaped corbels as secondary supports, reduces the actual stress on the tensioned beam, effectively lowering the tensile load on the lower chord steel tie rods and the bending and compressive stress on the upper chord concrete beam. Ultimately, this reduces deformation of the tensioned beam support, significantly improving the stability of the foundation pit support and preventing settlement of surrounding soil or damage to pipelines due to structural deformation.

[0015] (2) The opening is designed to be detached, so that the force is independent and clear: Existing composite support structures often suffer from mutual force interference and localized stress concentration due to direct contact between different components. This invention addresses this issue by creating an "opening" at the intersection of the splayed-eight-foot concrete beam and the lower chord steel tie rod, physically separating the two. Simultaneously, a reinforcement structure composed of rectangular steel pipes, reinforcing steel, and stirrups ensures the intersection meets strength standards. This design allows the tensioned beam and concrete components to form independent force systems: the tensioned beam focuses on bearing the mid-span load, while the splayed-eight-foot beam focuses on sharing the lateral loads. There is no additional stress interference, and the force transmission path is clear and traceable. This facilitates stress calculation and simulation during construction and reduces the difficulty of troubleshooting during later maintenance, solving the problems of ambiguous force distribution and susceptibility to failure due to mutual interference in traditional composite structures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall concrete components and tensioned beam structure. Figure 2 A detailed schematic diagram of the lower chord steel tie rod; Figure 3 A detailed schematic diagram of the support base and the concrete corbel. Figure 4 This is a sectional view of section AA; Figure 5 This is a sectional view of section BB; Figure label: 1. Upper chord concrete beam; 2. Lower chord steel tie rod; 3. Support rod. 4. Concrete beam with V-shaped feet; 5. Concrete corbel; 6. Concrete support. 7. Reinforcing steel, 8. Rectangular steel pipe, 9. Stirrups. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to specific embodiments. It should be noted that the following embodiments will help those skilled in the art to further understand this utility model, but do not limit this utility model in any way. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model. These all fall within the protection scope of this utility model.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Example 1: A tensioned beam composite structure supported by concrete components like Figure 1-5 As shown, this embodiment provides a tensioned beam composite structure supported by concrete components, which consists of concrete components and tensioned beams.

[0020] The tensioned beam consists of an upper chord concrete beam 1, a lower chord steel tie rod 2, and a strut 3.

[0021] The upper chord concrete beam 1 is horizontally positioned at the foundation pit; The lower chord steel tie rod 2 has multiple segments, a total of 5 segments in this embodiment; the two outermost segments of the lower chord steel tie rod 2 are side tie rods, which are anchored into the upper chord concrete beam 1; the support rod 3 has multiple rods, a total of 4 in this embodiment, which are respectively set at the connection of any two segments of the lower chord steel tie rod 2 and perpendicularly abut against the upper chord concrete beam 1, with support rod bases provided at the abutting parts (enlarged view as shown in the figure). Figure 3 (as shown) The area covered by the lower chord steel tie rod 2 and the strut 3 is the support range of the tensioned beam.

[0022] The concrete assembly consists of a figure-eight-shaped concrete beam 4 and a concrete support 6.

[0023] The concrete support 6 is provided in two sets, located on both sides of the tensioned beam.

[0024] Each set of concrete supports 6 has a figure-eight-shaped concrete beam 4 on both sides, hence the name.

[0025] One end of the V-shaped concrete beam 4, located near the tension beam, is connected to the concrete support 6, while the other end extends into the support range of the tension beam and abuts against the upper chord concrete beam 1. In this embodiment, the lower ends of the struts 3 on both sides abut against the concrete corbels 5, meaning that the lower chord steel tie rod 2, struts 3, and V-shaped concrete beam 4 form a stable triangular structure.

[0026] The V-shaped concrete beam 4 intersects with the side tie rod of the lower chord steel tie rod 2; this intersection is called an "opening". The opening ensures that the V-shaped concrete beam 4 and the lower chord steel tie rod 2 do not interfere with each other. A reinforcing structure is provided at the opening. The cross-sectional view AA of the opening viewed from the axis of the side tie rod of the lower chord steel tie rod 2 is shown below. Figure 4 As shown in Figure BB, the cross-sectional view of the opening viewed from the axis of the 4th axial direction of the splayed-eight concrete beam is as follows. Figure 5 As shown, a rectangular steel pipe 8 is provided on the outer side of the lower chord steel tie rod 2, and on the opposite sides of the rectangular steel pipe 8 (the left and right sides in this embodiment, and the upper and lower sides in other embodiments) (3 pairs in this embodiment), stirrups 9 are sleeved on the outer side of the reinforcing steel 7 and the figure-eight concrete beam 4.

[0027] The lower chord steel tie rod 2 can deform freely and is subjected to tension only, thus efficiently utilizing the material properties.

[0028] The tensioned beam is essentially a "compression-tension-force transmission" coordinated system: the upper chord concrete beam 1, being arranged laterally in the foundation pit, directly bears the upper vertical load (such as backfill and construction load) and horizontal load (soil pressure), and must resist both pressure and bending moment, thus belonging to the category of "compression-bending members"; the strut 3 vertically abuts against the upper chord concrete beam, responsible for transferring the load of the upper chord to the lower chord steel tie rod; while the lower chord steel tie rod 2, as the "tension core" of the system, after receiving the force transmitted by the strut, transmits the force axially through the design of "multi-segment splicing + side tie rod anchored into the upper chord" and is ultimately borne by the upper chord concrete beam. It does not need to bear pressure or bending moment throughout the process, but only needs to provide tension to balance the pressure of the upper chord, forming a stable force closed loop of "upper chord compression, lower chord tension".

[0029] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A tensioned beam composite structure supported by concrete components, characterized in that, Composed of concrete components and tensioned beams; The tensioned beam consists of an upper chord concrete beam (1), several lower chord steel tie rods (2) and several struts (3); the concrete assembly consists of a figure-eight-foot concrete beam (4) and a concrete support (6); The upper chord concrete beam (1) is horizontally positioned at the foundation pit; the lower chord steel tie rods (2) are connected end to end to form an arch-shaped structure and are supported on the upper chord concrete beam (1); the upper chord steel tie rods (3) are positioned between the upper chord concrete beam (1) and the lower chord steel tie rods (2); the lower chord steel tie rods (2) and the tie rods (3) form a support area. The concrete support (6) is vertically mounted on the upper chord concrete beam (1) and located on both sides of the arch-shaped structure enclosed by the lower chord steel tie rod (2). The figure-eight concrete beam (4) is connected to both sides of the concrete support (6), and one of the figure-eight concrete beams (4) is passed through by the lower chord steel tie rod (2), so that the bottom of the figure-eight concrete beam (4) extends into the arch-shaped structure enclosed by the lower chord steel tie rod (2).

2. The tensioned beam composite structure supported by concrete components according to claim 1, characterized in that, The lower chord steel tie rod (2) has n segments, where n is a positive integer ≥2. The two outermost segments of the lower chord steel tie rod (2) are side tie rods, and the bottom of the side tie rods is anchored into the upper chord concrete beam (1).

3. A tensioned beam composite structure supported by concrete components according to claim 2, characterized in that, The number of the struts (3) is n-1, and the number of the struts (3) is 1 less than the number of the lower chord steel tie rods (2). The struts (3) are respectively set at the connection of any two lower chord steel tie rods (2), and the upper end of the strut (3) is hinged to the two connected lower chord steel tie rods (2). The lower end of the strut (3) is perpendicular to the upper chord concrete beam (1).

4. A tensioned beam composite structure supported by concrete components according to claim 3, characterized in that, The lower ends of the two outermost struts (3) are supported on concrete corbels (5), which are fixed to the upper chord concrete beam (1).

5. A tensioned beam composite structure supported by concrete components according to claim 4, characterized in that, The area covered by the lower chord steel tie rod (2) and the strut (3) is the support range of the tensioned beam. The bottom of the figure-eight concrete beam (4) through which the lower chord steel tie rod (2) passes is located within the support range of the tensioned beam.

6. A tensioned beam composite structure supported by concrete components according to claim 5, characterized in that, The concrete support (6) is provided in two sets, located on both sides of the bow structure of the tensioned beam. Each set of concrete components has an eight-foot concrete beam (4) extending into the support range of the tensioned beam.

7. A tensioned beam composite structure supported by concrete components according to claim 6, characterized in that, The figure-eight-foot concrete beam (4) near the side of the tension beam is connected at one end to the concrete support (6) and at the other end to the upper chord concrete beam (1).

8. A tensioned beam composite structure supported by concrete components according to claim 7, characterized in that, An opening is provided on the figure-eight concrete beam (4) through which the lower chord steel tie rod (2) passes, and a rectangular steel pipe (8) is installed in the opening, through which the lower chord steel tie rod (2) passes.

9. A tensioned beam composite structure supported by concrete components according to claim 8, characterized in that, Several reinforcing steels (7) are provided on the opposite sides of the rectangular steel pipe (8), and the reinforcing steels (7) are embedded in the figure-eight-foot concrete beam (4).

10. A tensioned beam composite structure supported by concrete components according to claim 9, characterized in that, The reinforcing steel (7) is also provided with stirrups (9), which surround the reinforcing steel (7).

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