A large-span prefabricated truss suspension support system

Abstract

This invention relates to the field of foundation pit support technology in civil engineering, and in particular to a large-span prefabricated truss-type support system, comprising an upper truss support and a lower universal support; multiple upper truss supports and lower universal supports are arranged parallel to each other in the horizontal direction; the upper truss support is connected to the nearest lower universal support through hangers, and the lower universal supports are interconnected layer by layer through hangers; a first support column is also provided on the upper truss support; the top of the first support column is fixedly connected to the upper truss support, and the bottom end passes through and is fixed to the ground after connecting with all the lower universal supports; the upper truss support and lower universal support are directly or indirectly connected to the retaining piles.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology in civil engineering, and in particular to a large-span prefabricated truss hanger support system. Background Technology

[0002] In practical applications of building foundation pit engineering, steel structure support systems have been widely used due to their numerous significant advantages. These advantages are specifically reflected in high strength, prefabrication, and rapid construction. High strength allows steel structure support systems to withstand large loads, ensuring the stability of the foundation pit project; prefabrication allows for pre-processing in factories, reducing on-site construction time and workload; and rapid construction significantly shortens the overall construction cycle of the foundation pit project. However, existing conventional steel structure support systems have certain limitations. These limitations are mainly constrained by factors such as structural form, material properties, and joint construction. Currently common conventional steel structure support systems, such as those using H-beams or steel-concrete composite supports, typically have an economically reasonable span strictly limited to within 20 meters. This technical bottleneck directly leads to a series of issues that cannot be ignored: (1) Densely arranged columns, resulting in serious material waste: In order to meet the support requirements, a large number of vertical columns need to be set up inside the foundation pit as intermediate supports. These columns are numerous and densely distributed, and most of them will be buried in the base slab after construction, making them impossible to recycle and reuse. This not only causes a large waste of building materials, but also significantly increases the project cost and adds unnecessary economic burden.

[0003] (2) Low construction efficiency: The dense network of columns inside the foundation pit acts like a series of barriers, severely cutting off the working space within the pit. Earthmoving machinery and vehicles face extreme difficulty in this environment, making smooth operation impossible. This greatly hinders the passage and efficient operation of earthmoving machinery and vehicles, resulting in slow construction progress and extending the overall project duration.

[0004] (3) Poor compatibility and adaptability: The components and connection methods used in traditional support systems have certain drawbacks. In the case of large spans, it is difficult to achieve reliable stress and effective deformation control. When the span increases, traditional support systems cannot adapt well to the stress changes of the structure, and are prone to problems such as excessive deformation, which affect the safety and stability of the foundation pit project.

[0005] Therefore, developing a new type of prefabricated steel structure support system has become an urgent technical problem to be solved. This new support system needs to be capable of achieving spans of up to 40 meters and significantly reduce the number of columns. Through such improvements, the problems existing in conventional steel structure support systems can be effectively solved, improving the construction efficiency and economic benefits of building foundation pit engineering. Summary of the Invention

[0006] The purpose of this invention is to provide a large-span prefabricated truss hanger support system to solve at least one of the technical problems existing in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention provides a large-span prefabricated truss hanger support system, including an upper truss support and a lower general support; The upper truss support and the lower general support are arranged in multiple parallel rows in the horizontal direction; The lower universal support is arranged in multiple layers parallel to each other in the vertical direction. The upper truss support is connected to the nearest lower universal support through hangers. The lower universal supports are connected to each other through hangers. The upper truss support is also provided with a first support column; The top of the first support column is fixedly connected to the upper truss support, and the bottom end passes through and is fixed to the ground after connecting with all the lower general supports; The upper truss support and the lower general support are directly or indirectly connected to the retaining piles.

[0008] Furthermore, the upper truss support includes standard trusses and joint trusses; The standard truss is provided in multiple sections, and adjacent sections are connected by joint trusses. The lower end of the joint truss is connected to the hanger rod.

[0009] Furthermore, the standard truss is composed of a standard truss upper chord, a standard truss lower chord, a standard truss vertical support rod, and a standard truss vertical support diagonal cross web member; The standard truss upper chord and the standard truss lower chord are arranged parallel to each other vertically, and a plurality of the standard truss vertical support rods are spaced apart between the standard truss upper chord and the standard truss lower chord; A first connecting web is provided at the angle where the upper chord of the standard truss and the vertical support rod of the standard truss are perpendicularly connected, as well as at the angle where the lower chord of the standard truss and the vertical support rod of the standard truss are perpendicularly connected. Each of the standard truss vertical support diagonal cross web members is set in a rectangular space composed of the standard truss upper chord, the standard truss lower chord, and the standard truss vertical support members. The four ends of the standard truss vertical support diagonal cross web members are respectively connected to the first connecting web plate at the four corners of the rectangular space.

[0010] Furthermore, standard truss horizontal support diagonal braces are fixedly installed between two adjacent standard trusses on the same horizontal plane to enhance the lateral stability of the overall structure.

[0011] Furthermore, the joint truss includes a joint truss upper chord, a joint truss lower chord, a joint truss vertical support rod, and a first field-installed diagonal cross web member; The upper chord and lower chord of the joint truss are arranged parallel to each other vertically, and the vertical support rod of the joint truss is vertically connected between the upper chord and the lower chord of the joint truss. A second connecting web is provided at the angle where the upper chord of the joint truss and the vertical support rod of the joint truss are vertically connected, as well as at the angle where the lower chord of the joint truss and the vertical support rod of the joint truss are vertically connected. The upper chord of the joint truss and the upper chord of the standard truss are arranged opposite each other, and the lower chord of the joint truss and the lower chord of the standard truss are arranged opposite each other. The first field-installed diagonal cross web member is arranged within the rectangular area enclosed by the upper chord of the joint truss, the lower chord of the joint truss, the vertical support rod of the joint truss, the upper chord of the standard truss, the lower chord of the standard truss, and the vertical support rod of the standard truss. The four ends of the first field-installed diagonal cross web member are fixedly connected to the two first connecting webs of the adjacent standard truss and the two second connecting webs of the joint truss, respectively, to achieve efficient connection and uniform force transmission between the standard truss and the joint truss.

[0012] Furthermore, the joint truss also includes horizontal connecting rods for the joint truss; The horizontal connecting rods of the joint truss are arranged between the upper chords of two adjacent joint trusses and between the lower chords of two adjacent joint trusses to enhance the overall connection performance of the joint truss in the horizontal direction.

[0013] Furthermore, the ends of both the upper chord and the lower chord of the joint truss are provided with second connecting end plates; The ends of the upper chord and the lower chord of the standard truss are each provided with a first connecting end plate; The first connecting end plate and the second connecting end plate are fastened together.

[0014] Furthermore, a first pin plate is fixedly provided at the lower end of the joint truss; The two ends of the boom are fixedly provided with second pin plates; The joint truss is connected to the second pin plate at the upper end of the hanger via the first pin plate, thereby enabling flexible transfer of vertical loads and adaptability to rotation at the joint.

[0015] Furthermore, the lower universal support includes a first universal support member and a clamping, sliding node disposed on the first universal support member; The clamping sliding node includes an upper clamping beam and a lower clamping beam; The upper clamping beam and the lower clamping beam are connected by long bolts; The upper clamping beam and the lower clamping beam clamp the first general-purpose support member from above and below; Both the upper clamping beam and the lower clamping beam are provided with a third pin plate at the end away from the first general support member, for pin connection with the second pin plate provided on the hanger rod.

[0016] Furthermore, the upper and lower clamping beams are long beam structures, with their length direction perpendicular to the axis of the first universal support member, and multiple first universal support members on the horizontal plane are clamped between the same pair of upper and lower clamping beams.

[0017] Furthermore, the upper truss support also includes a variable cross-section transfer truss; The variable cross section transfer truss includes a variable cross section transfer truss upper chord, a variable cross section transfer truss lower chord, a variable cross section transfer truss upper diagonal web member, a variable cross section transfer truss lower diagonal web member, a variable cross section transfer truss vertical support member, a second field-installed diagonal cross web member, and a variable cross section transfer truss connector. The upper chord of the variable cross-section transfer truss is arranged parallel to the lower chord of the variable cross-section transfer truss. The variable cross-section transfer truss has an integrally provided upper diagonal web member at the end of the upper chord member; The lower chord end of the variable cross-section transfer truss is integrally provided with a variable cross-section transfer truss inclined lower web member; The upper and lower diagonal web members of the variable cross-section transfer truss meet at the end of the variable cross-section transfer truss connector, forming a stable triangular force system. The vertical support rod of the variable cross-section transfer truss is connected between the upper chord and the lower chord of the variable cross-section transfer truss; A third connecting web is provided at the angle where the upper chord of the variable cross-section transfer truss is perpendicularly connected to the vertical support rod of the variable cross-section transfer truss, and at the connection point where the lower chord of the variable cross-section transfer truss is connected to the vertical support rod of the variable cross-section transfer truss. The second on-site installed diagonal cross brace is set within the rectangular space enclosed by the upper chord of the variable cross section transfer truss, the lower chord of the variable cross section transfer truss, the upper chord of the standard truss, the lower chord of the standard truss, the vertical support rod of the standard truss, and the vertical support rod of the variable cross section transfer truss. The four ends of the second field-installed oblique cross web are respectively fixedly connected to the two third connecting webs and the two first connecting webs at the four corners of the rectangular space.

[0018] Furthermore, a reinforcing web is provided in the triangular region formed by the upper diagonal web member of the variable cross-section transfer truss, the lower diagonal web member of the variable cross-section transfer truss, and the vertical support member of the variable cross-section transfer truss; The reinforced web is provided with grid-like reinforcing stiffeners to improve the shear and torsional stiffness of the reinforced web.

[0019] Furthermore, a third connecting end plate is provided at the end of both the upper chord and the lower chord of the variable cross-section transfer truss that is away from the connector of the variable cross-section transfer truss; The third connecting end plate is fastened to the first connecting end plate.

[0020] Furthermore, the upper truss support also includes a transition joint; The transition joint includes a stiffened I-beam and transverse tie rods; The transverse tie rods connect multiple stiffened I-beams, and each stiffened I-beam is connected to a variable cross-section conversion truss.

[0021] Furthermore, a fourth connecting end plate is provided at one end of the variable cross-section conversion truss connector near the conversion joint; The stiffened I-beam is provided with a fifth connecting end plate and a sixth connecting end plate at both ends; The fourth connecting end plate on the variable cross-section conversion truss connector is fastened to the fifth connecting end plate on the stiffening I-beam.

[0022] Furthermore, it also includes the crown beam; The sixth connecting end plate is directly or indirectly connected to the cap beam; The cap beam is set at the top of the retaining piles.

[0023] Furthermore, it also includes a second general-purpose support component; One end of the second general-purpose support member is connected to the sixth connecting end plate, and the other end is connected to the cap beam.

[0024] Furthermore, it also includes a second supporting column; The top of the second support column is fixedly mounted on the lower end surface of the second universal support component; The bottom end of the second support column passes through the first universal support member of each layer and is fixed to the ground after being connected to the first universal support member of each layer, so as to provide upward support force to the first universal support member and the second universal support member.

[0025] By adopting the above technical solution, the present invention has the following beneficial effects: (1) Significant economic benefits: By adopting large-span prefabricated trusses as the primary load-bearing components, the number of vertical columns is fundamentally reduced; at the same time, the hangers and connecting nodes can be disassembled and recycled, which greatly improves the recycling rate of materials and reduces the project cost.

[0026] (2) High construction efficiency: Due to the reduction in the number of columns and the installation of the hangers after excavation, an open and unobstructed working space is created for earthwork excavation, which significantly improves the passage of earthwork vehicles and the efficiency of excavation, and shortens the construction period.

[0027] (3) Strong compatibility and adaptability: Through the unique design of sliding clamping nodes and conversion connection devices, this system can be easily and reliably connected with a variety of market-common support components and retaining piles (walls) such as H-beams and steel pipes, which enhances the universality and market application potential of the system.

[0028] (4) Clear stress and reliable safety: The prefabricated truss structure of the large-span prefabricated truss hanger support system bears two types of loads at the same time: one is the horizontal axial force transmitted through the variable cross-section conversion truss and conversion joint at both ends; the other is the self-weight and construction load of the second and third horizontal supports transmitted through the hangers. The stress is clear and the theoretical calculation shows that it is safe and reliable. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic plan view of the large-span prefabricated truss hanger support system disclosed in this application, including a second general support component. Figure 2 This is a schematic diagram of the planar structure of the large-span prefabricated truss hanger support system disclosed in this application, excluding the second general support component, from the main view. Figure 3 This is a plan view of the large-span prefabricated truss hanger support system disclosed in this application, including the second general support component. Figure 4 This is a three-dimensional structural diagram of a standard truss; Figure 5 This is a schematic diagram of the standard truss structure from the main view. Figure 6 This is a three-dimensional structural diagram of the joint truss; Figure 7 This is a schematic diagram of the planar structure from the main view when the joint truss is connected to the standard truss; Figure 8 This is a three-dimensional structural diagram of the connection between the joint truss and the standard truss; Figure 9This is a three-dimensional structural diagram of the connection between the joint truss and the hanger; Figure 10 This is a three-dimensional structural diagram of the end of the boom; Figure 11 This is a three-dimensional structural diagram of the connection between the joint truss and the hanger. Figure 12 A three-dimensional structural diagram of the connection between the first general-purpose support component and the clamp-type sliding node; Figure 13 A three-dimensional structural diagram of the clamp-type sliding node and the connection of the hanger rod; Figure 14 This is a three-dimensional structural diagram of a variable cross-section transfer truss; Figure 15 This is a three-dimensional structural diagram of the adapter. Figure 16 A three-dimensional structural diagram of the connection between the joint truss, the variable cross-section transfer truss, and the transfer joint; Figure 17 This is a schematic plan view of the joint truss, variable cross-section transfer truss, and transfer joint connection from the main perspective. Figure 18 This is a force transmission path diagram of the large-span prefabricated truss hanger support system disclosed in this application.

[0031] Figure label: 1-Upper truss support; 11-Standard truss; 111-Standard truss upper chord; 112-Standard truss lower chord; 113-Standard truss vertical support; 114-Standard truss vertical support diagonal cross web member; 115-First connecting web plate; 116-Standard truss horizontal support diagonal web member; 117-First connecting end plate; 12-Joint truss; 121-Joint truss upper chord; 122-Joint truss lower chord; 123-Joint truss vertical support; 124-First field-installed diagonal cross web member; 125-Second connecting web plate; 126-Second connecting end plate; 127-First pin plate; 128-Joint truss horizontal connecting member; 13-Variable cross section transfer truss; 131-Variable cross section transfer truss upper chord; 132-Variable cross section transfer truss lower chord; 133-Variable cross section transfer truss diagonal upper web member; 134-Variable cross section 135-Transformer truss diagonal lower web member; 136-Vertical support rod of variable cross section transformer truss; 137-Second field-installed diagonal cross web member; 138-Variable cross section transformer truss connector; 139-Third connecting web plate; 1310-Reinforced stiffening rib; 1311-Third connecting end plate; 1312-Fourth connecting end plate; 14-Transformer joint; 141-Stiffened I-beam; 142-Transverse tie rod; 143-Fifth connecting end plate; 144-Sixth connecting end plate; 2-Lower general-purpose support; 21-First general-purpose support component; 22-Clamping sliding node; 221-Upper clamping beam; 222-Lower clamping beam; 223-Long bolt; 224-Third pin plate; 3-Hanging rod; 31-Second pin plate; 4-First support column; 5-Retaining pile; 6-Cap beam; 7-Second general-purpose support component; 8-Second support column. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 the invention 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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 invention based on the specific circumstances.

[0035] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed by the present invention to further explain the specific content of the invention, and these settings can be combined or used in conjunction with each other.

[0036] The present invention will be further explained below with reference to specific embodiments.

[0037] like Figure 1-3 As shown in the figure, this embodiment provides a large-span prefabricated truss hanger type 3 support system, including an upper truss support 1 and a lower general support 2; The upper truss support 1 and the lower general support 2 are arranged in multiple parallel lines in the horizontal direction; The lower general support 2 is arranged in multiple layers parallel to each other in the vertical direction. The upper truss support 1 is connected to the nearest lower general support 2 through the hanger 3. The lower general supports 2 are connected to each other through the hanger 3. The upper truss support 1 is also provided with a first support column 4; The top of the first support column 4 is fixedly connected to the upper truss support 1, and the bottom end passes through and is fixed to the ground after connecting with all the lower general supports 2. The upper truss support 1 and the lower general support 2 are directly or indirectly connected to the retaining piles 5.

[0038] This application is applicable to foundation pit support construction scenarios, effectively improving the overall stability and bearing capacity of foundation pit support structures, especially suitable for support needs in deep and large foundation pits and complex geological conditions. Retaining piles 5 are installed in the foundation pit, arranged circumferentially around the pit, and fixed to the upper truss support 1 and the lower general support 2 via connectors, forming a spatially coordinated force-bearing system. The ends of the upper truss support 1 are directly or indirectly located at the top of the retaining piles 5, thus providing horizontal constraints and vertical support for the upper truss support 1. The lower general support 2 forms a tie system with the upper truss support 1 and retaining piles 5 via vertical hangers 3, effectively transmitting and dispersing lateral earth pressure. The first support column 4 penetrates the multi-layer hanger 3 support structure, enhancing the vertical stiffness and bending resistance of the overall system, allowing the load of each layer to be transmitted step by step to the ground foundation. This system, through multi-layered spatial force coordination, significantly improves the redundancy and deformation control capability of the support structure, maintaining stability even under asymmetrical loading or local failure conditions. This design offers ample working space near the bottom of the actual construction site, with no vertical supports obstructing the area between the two first support columns 4. This facilitates the passage of large machinery and the operation of earthmoving vehicles. Actual experimental data shows that the distance between the first support columns 4 can reach over 40 meters, significantly improving construction efficiency and operational flexibility while ensuring the safety and stability of the deep foundation pit support structure. This design effectively solves the problems of limited space and significant construction interference in traditional support systems, making it particularly suitable for deep and large foundation pit projects in urban centers. While ensuring structural rigidity, it provides sufficient operating space for earthwork excavation and underground structure construction, demonstrating significant potential for widespread application.

[0039] like Figure 4-8 As shown, as a further embodiment of this example, the upper truss support 1 includes a standard truss 11 and a joint truss 12. The standard truss 11 is provided with multiple segments, and adjacent segments are connected by a joint truss 12. The lower end of the joint truss 12 is connected to the hanger 3.

[0040] As a further embodiment of this example, the standard truss 11 is composed of a standard truss upper chord 111, a standard truss lower chord 112, a standard truss vertical support rod 113, and a standard truss vertical support diagonal cross web member 114. The standard truss upper chord 111 and the standard truss lower chord 112 are arranged parallel to each other vertically, and a plurality of standard truss vertical support rods 113 are spaced apart between the standard truss upper chord 111 and the standard truss lower chord 112; A first connecting web 115 is provided at the angle where the upper chord 111 of the standard truss and the vertical support rod 113 of the standard truss are vertically connected, and at the angle where the lower chord 112 of the standard truss and the vertical support rod 113 of the standard truss are vertically connected. Each of the standard truss vertical support diagonal cross web members 114 is set in a rectangular space composed of a standard truss upper chord 111, a standard truss lower chord 112, and a standard truss vertical support member 113. The four ends of the standard truss vertical support diagonal cross web members 114 are respectively connected to the first connecting web members 115 at the four corners of the rectangular space.

[0041] As a further embodiment of this invention, a standard truss horizontal support diagonal brace 116 is also fixedly installed between two adjacent standard trusses 11 on the same horizontal plane to enhance the lateral stability of the overall structure.

[0042] As a further embodiment of this example, the joint truss 12 includes a joint truss upper chord 121, a joint truss lower chord 122, a joint truss vertical support rod 123, and a first field-installed oblique cross web member 124. The upper chord 121 and the lower chord 122 of the joint truss are arranged parallel to each other vertically, and the vertical support rod 123 of the joint truss is vertically connected between the upper chord 121 and the lower chord 122 of the joint truss. A second connecting web 125 is provided at the angle where the upper chord 121 of the joint truss and the vertical support rod 123 of the joint truss are vertically connected, as well as at the angle where the lower chord 122 of the joint truss and the vertical support rod 123 of the joint truss are vertically connected. The joint truss upper chord 121 and the standard truss upper chord 111 are arranged opposite each other, and the joint truss lower chord 122 and the standard truss lower chord 112 are arranged opposite each other. The first field-installed diagonal cross web member 124 is arranged within the rectangular area enclosed by the joint truss upper chord 121, the joint truss lower chord 122, the joint truss vertical support rod 123, the standard truss upper chord 111, the standard truss lower chord 112, and the standard truss vertical support rod 113. The four ends of the first field-installed diagonal cross web member 124 are fixedly connected to the two first connecting webs 115 of the adjacent standard truss 11 and the two second connecting webs 125 of the joint truss 12, respectively, so as to realize efficient connection and uniform force transmission between the standard truss 11 and the joint truss 12.

[0043] As a further embodiment of this embodiment, the joint truss 12 also includes a joint truss horizontal connecting rod 128; The horizontal connecting rod 128 of the joint truss is arranged between two adjacent upper chords 121 of the joint truss and between two adjacent lower chords 122 of the joint truss, in order to enhance the overall connection performance of the joint truss 12 in the horizontal direction.

[0044] As a further embodiment of this example, the ends of the upper chord 121 and the lower chord 122 of the joint truss are both provided with second connecting end plates 126. The ends of the upper chord 111 and the lower chord 112 of the standard truss are each provided with a first connecting end plate 117; The first connecting end plate 117 and the second connecting end plate 126 are fastened together.

[0045] The standard truss 11 and the joint truss 12 of this application are rigidly connected, effectively improving the overall stiffness and load-bearing capacity of the structure and ensuring that the load is evenly distributed and transferred among multiple truss units. This connection avoids stress concentration. Simultaneously, the synergistic effect of the first connecting web 115 and the second connecting web 125 significantly enhances the shear and bending resistance of the joint area, ensuring the structure remains stable under complex stress conditions. The horizontal connecting rod 128 of the joint truss and the horizontal support diagonal web 116 of the standard truss form a spatially interlaced support system, further suppressing lateral deformation and improving the torsional stiffness of the overall structure. This connection method facilitates on-site assembly, reduces welding work, and improves construction efficiency. The first connecting end plate 117 and the second connecting end plate 126 are fastened together with high-strength bolts, achieving standardized and rapid installation and disassembly, facilitating transportation and reuse. All member connection nodes are arranged symmetrically to ensure that the center of force coincides, effectively avoiding the generation of eccentric bending moments. The installation of the diagonal cross brace 124 at the site, together with the horizontal connecting rod, forms a stable grid-like force transmission path, significantly improving the structure's adaptability under dynamic and wind loads.

[0046] like Figure 9-11 As shown, as a further embodiment of this embodiment, a first pin plate 127 is fixedly provided at the lower end of the joint truss 12. The two ends of the boom 3 are fixedly provided with second pin plates 31; The joint truss 12 is connected to the second pin plate 31 at the upper end of the hanger 3 via the first pin plate 127, thereby achieving flexible transfer of vertical loads and rotational adaptability at the nodes.

[0047] like Figure 12-13 As shown, as a further embodiment of this example, the lower universal support 2 includes a first universal support member 21 and a clamping sliding node 22 disposed on the first universal support member 21; The clamping sliding node 22 includes an upper clamping beam 221 and a lower clamping beam 222; The upper clamping beam 221 and the lower clamping beam 222 are connected by long bolts 223; The upper clamping beam 221 and the lower clamping beam 222 clamp the first general-purpose support member 21 from above and below; The upper clamping beam 221 and the lower clamping beam 222 are both provided with a third pin plate 224 at the end away from the first general support member 21, for pin connection with the second pin plate 31 provided on the hanger 3.

[0048] As a further embodiment of this example, the upper clamping beam 221 and the lower clamping beam 222 are long beam structures, with their length direction perpendicular to the axis of the first universal support member 21, and multiple first universal support members 21 on the horizontal plane are clamped between the same pair of upper clamping beams 221 and lower clamping beams 222.

[0049] The hanger 3 of this application achieves flexible connection with the joint truss 12 and the lower support layer in the vertical direction through pin connection, effectively adapting to structural displacement and temperature deformation. The structural feature of the clamp-type sliding node 22 allows the first general-purpose support member 21 to slide along the axial direction without changing the overall constraint conditions, releasing temperature stress and shrinkage creep effects or making appropriate adjustments, thereby ensuring the uniformity of stress and geometric stability of the structure during the engineering construction process.

[0050] like Figure 14-17 As shown, as a further embodiment of this example, the upper truss support 1 further includes a variable cross-section conversion truss 13; The variable cross section transition truss 13 includes a variable cross section transition truss upper chord 131, a variable cross section transition truss lower chord 132, a variable cross section transition truss upper diagonal web member 133, a variable cross section transition truss lower diagonal web member 134, a variable cross section transition truss vertical support member 135, a second field-installed diagonal cross web member 136, and a variable cross section transition truss connector 137; The upper chord 131 of the variable cross-section conversion truss is arranged parallel to the lower chord 132 of the variable cross-section conversion truss. The variable cross-section transfer truss upper chord 131 is integrally provided with a variable cross-section transfer truss inclined upper web member 133 at its end; The lower chord 132 of the variable cross-section transfer truss is integrally provided with a variable cross-section transfer truss inclined lower web member 134 at its end; The upper diagonal web member 133 and the lower diagonal web member 134 of the variable cross-section transfer truss meet at the end of the variable cross-section transfer truss connector 137, forming a stable triangular force system. The vertical support rod 135 of the variable cross-section transfer truss is connected between the upper chord 131 and the lower chord of the variable cross-section transfer truss; A third connecting web 138 is provided at the angle where the upper chord 131 of the variable cross-section conversion truss is perpendicularly connected to the vertical support rod 135 of the variable cross-section conversion truss, and at the connection point where the lower chord 132 of the variable cross-section conversion truss is connected to the vertical support rod 135 of the variable cross-section conversion truss. The second on-site installed diagonal cross brace 136 is set within the rectangular space enclosed by the upper chord 131 of the variable cross section conversion truss, the lower chord 132 of the variable cross section conversion truss, the upper chord 111 of the standard truss, the lower chord 112 of the standard truss, the vertical support rod 113 of the standard truss, and the vertical support rod 135 of the variable cross section conversion truss; The four ends of the second field-mounted oblique cross web 136 are respectively fixedly connected to the two third connecting webs 138 and the two first connecting webs 115 at the four corners of the rectangular space.

[0051] The design of the variable cross-section transfer truss 13 in this application effectively solves the stress concentration problem in the region of abrupt change in the structural cross-section, and achieves smooth transmission of internal forces through a gradually changing member layout. Its diagonal web members and vertical supports work together to enhance the stiffness matching and deformation coordination capabilities of the joint area.

[0052] As a further embodiment of this example, a reinforcing web plate 139 is provided in the triangular region formed by the upper inclined web member 133 of the variable cross-section conversion truss, the lower inclined web member 134 of the variable cross-section conversion truss, and the vertical support member 135 of the variable cross-section conversion truss. The reinforced web 139 is provided with grid-like reinforcing stiffeners 1310 to improve the shear and torsional stiffness of the reinforced web 139.

[0053] As a further embodiment of this embodiment, a third connecting end plate 1311 is provided at the end of the upper chord 131 and the lower chord 132 of the variable cross-section conversion truss that is away from the connector 137 of the variable cross-section conversion truss. The third connecting end plate 1311 is fastened to the first connecting end plate 117.

[0054] As a further embodiment of this embodiment, the upper truss support 1 also includes a conversion joint 14; The conversion joint 14 includes a stiffening I-beam 141 and a transverse tie rod 142; The transverse tie rod 142 connects multiple stiffened I-beams 141, and each stiffened I-beam 141 is connected to a variable cross-section conversion truss 13.

[0055] The transition joint 14 in this application differs from other truss structures. Through the coordinated work of the stiffening I-beam 141 and the transverse tie rod 142, it achieves multi-path transmission and balanced distribution of internal forces in the upper truss support 1, effectively avoiding fatigue damage caused by excessive local stress in traditional nodes. This design significantly improves upon traditional truss designs in terms of stress rationality and structural durability, and is particularly suitable for the transmission of complex loads in large-span spatial structures.

[0056] As a further embodiment of this embodiment, a fourth connecting end plate 1312 is provided at one end of the variable cross-section conversion truss connector 137 near the conversion joint 14. The stiffened I-beam 141 is provided with a fifth connecting end plate 143 and a sixth connecting end plate 144 at both ends; The fourth connecting end plate 1312 on the variable cross-section conversion truss connector 137 is fastened to the fifth connecting end plate 143 on the stiffening I-beam 141.

[0057] As a further embodiment of this invention, a crown beam 6 is also included; The sixth connecting end plate 144 is directly or indirectly connected to the cap beam 6; The cap beam 6 is set at the top of the retaining pile 5.

[0058] As a further embodiment of this invention, a second general-purpose support member 7 is also included; One end of the second general-purpose support member 7 is connected to the sixth connecting end plate 144, and the other end is connected to the cap beam 6.

[0059] As a further embodiment of this invention, a second supporting column 8 is also included; The top of the second support column 8 is fixedly mounted on the lower end surface of the second universal support component 7; The bottom end of the second support column 8 passes through the first universal support member 21 of each layer and is fixed to the ground after being connected to the first universal support member 21 of each layer, so as to provide upward support force for the first universal support member 21 and the second universal support member 7.

[0060] The large-span prefabricated truss hanger-type 3 support system disclosed in this application has a clear force transmission path during actual construction. Firstly, it transmits the horizontal axial force through the variable cross-section transition trusses 13 and transition joints 14 at both ends; secondly, it transmits the self-weight of the lower horizontal support and the construction load through the hangers 3. The force distribution is clear, and theoretical calculations confirm its safety and reliability. The specific force transmission path diagram is shown below. Figure 18 As shown.

[0061] By adopting the above technical solution, the present invention has the following beneficial effects: (1) The implementation method of this application effectively improves the overall stability and bearing capacity of the foundation pit support structure, and meets the support requirements of deep and large foundation pits and complex geological conditions. Through multi-level spatial force coordination, a spatial collaborative force system is formed, which enhances the redundancy and deformation control capability of the support structure. It can still maintain stability under asymmetrical loading or local failure conditions, and ensure the safety of the deep foundation pit support structure.

[0062] (2) The actual construction site has a wide working space near the lower area. There is no vertical support to block the two first support columns 4. The distance between the first support columns 4 can reach more than 40 meters, which facilitates the passage of large machinery and equipment and the operation of earthmoving vehicles. It greatly improves construction efficiency and operational flexibility, solves the problems of limited space and large construction interference in traditional support systems, and is suitable for deep foundation pit projects in urban center areas, providing sufficient operating space for earthwork excavation and underground structure construction.

[0063] (3) The standard truss 11 and the joint truss 12 are rigidly connected to improve the overall stiffness and bearing capacity of the structure, ensure the uniform distribution and transmission of loads, and avoid stress concentration; the shear and bending resistance of the node area is enhanced by the synergistic effect of the connecting webs, so that the structure is stable under complex stress conditions; the horizontal connecting rods and the supporting diagonal webs form a spatial staggered support system, suppressing lateral deformation and improving torsional stiffness; the connection method facilitates on-site assembly, reduces welding work, improves construction efficiency, realizes standardized and rapid installation and disassembly, and facilitates transportation and reuse; the connection nodes of each member are symmetrically arranged to avoid the generation of eccentric bending moment; the diagonal cross webs and the horizontal connecting rods form a stable grid-like force transmission path, which improves the adaptability of the structure under soil pressure and construction load.

[0064] (4) The hanger 3 is connected to the joint truss 12 and the lower support layer by pin connection to adapt to structural displacement and temperature deformation; the clamp-type sliding node 22 allows the first general support component 21 to slide along the axis to release temperature stress and shrinkage creep effect or make appropriate adjustments to ensure the uniformity of structural stress and geometric stability.

[0065] (5) The variable cross-section transformation truss 13 solves the problem of stress concentration in the area of ​​abrupt change in the cross-section of the structure. The internal force is smoothly transmitted through the gradual arrangement of the members, which significantly improves the rationality of the force and the durability of the structure. It is suitable for the complex load transmission requirements of large-span spatial structures. The diagonal web members and vertical supports work together to enhance the stiffness matching and deformation coordination of the node area. The reinforced web 139 and the grid-like reinforced stiffening ribs 1310 are set to improve the shear and torsional stiffness.

[0066] (6) The conversion joint 14 works in coordination with the stiffening I-beam 141 and the transverse tie rod 142 to realize the multi-path transmission and balanced distribution of the internal forces in the upper truss layer 113 of the variable cross-section conversion truss, and has interface compatibility with the second general support component 7 or the cap beam 6, effectively improving the adaptability and overall coordination of the entire support system.

Claims

1. A long span fabricated truss boom supported system, characterized by, Includes upper truss support and lower general support; The upper truss support and the lower general support are arranged in multiple parallel rows in the horizontal direction; The lower universal support is arranged in multiple layers parallel to each other in the vertical direction. The upper truss support is connected to the nearest lower universal support through hangers. The lower universal supports are connected to each other through hangers. The upper truss support is also provided with a first support column; The top of the first support column is fixedly connected to the upper truss support, and the bottom end passes through and is fixed to the ground after connecting with all the lower general supports; The upper truss support and the lower general support are directly or indirectly connected to the retaining piles. The upper truss support includes standard trusses and joint trusses; The standard truss is provided in multiple sections, and adjacent sections are connected by joint trusses. The lower end of the joint truss is connected to the hanger.

2. The long-span fabricated truss boom supported system according to claim 1, wherein, The standard truss consists of a standard truss upper chord, a standard truss lower chord, a standard truss vertical support member, and a standard truss vertical support diagonal cross web member. The standard truss upper chord and the standard truss lower chord are arranged parallel to each other vertically, and a plurality of the standard truss vertical support rods are spaced apart between the standard truss upper chord and the standard truss lower chord; A first connecting web is provided at the angle where the upper chord of the standard truss and the vertical support rod of the standard truss are perpendicularly connected, as well as at the angle where the lower chord of the standard truss and the vertical support rod of the standard truss are perpendicularly connected. Each of the standard truss vertical support diagonal cross web members is set in a rectangular space composed of the standard truss upper chord, the standard truss lower chord, and the standard truss vertical support member. The four ends of the standard truss vertical support diagonal cross web members are respectively connected to the first connecting web members at the four corners of the rectangular space. On the same horizontal plane, standard truss horizontal support diagonal braces are also fixedly installed between two adjacent standard trusses to enhance the lateral stability of the overall structure.

3. The large-span prefabricated truss suspension support system according to claim 1, characterized in that, The joint truss includes a joint truss upper chord, a joint truss lower chord, a joint truss vertical support rod, and a first on-site installed diagonal cross web member; The upper chord and lower chord of the joint truss are arranged parallel to each other vertically, and the vertical support rod of the joint truss is vertically connected between the upper chord and the lower chord of the joint truss. A second connecting web is provided at the angle where the upper chord of the joint truss and the vertical support rod of the joint truss are vertically connected, as well as at the angle where the lower chord of the joint truss and the vertical support rod of the joint truss are vertically connected. The joint truss upper chord and the standard truss upper chord are arranged opposite each other, and the joint truss lower chord and the standard truss lower chord are arranged opposite each other. The first field-installed diagonal cross web member is set in the rectangular area enclosed by the joint truss upper chord, the joint truss lower chord, the joint truss vertical support rod, the standard truss upper chord, the standard truss lower chord, and the standard truss vertical support rod. The four ends of the first field-installed diagonal cross web member are fixedly connected to the two first connecting webs of the adjacent standard truss and the two second connecting webs of the joint truss, respectively, to achieve efficient connection and uniform force transmission between the standard truss and the joint truss. The joint truss also includes horizontal connecting rods for the joint truss; The horizontal connecting rods of the joint truss are arranged between the upper chords of two adjacent joint trusses and between the lower chords of two adjacent joint trusses to enhance the overall connection performance of the joint truss in the horizontal direction. The ends of the upper chord and the lower chord of the joint truss are each provided with a second connecting end plate; The ends of the upper chord and the lower chord of the standard truss are each provided with a first connecting end plate; The first connecting end plate and the second connecting end plate are fastened together.

4. The large-span prefabricated truss suspension support system according to claim 1, characterized in that, The lower end of the joint truss is fixedly provided with a first pin plate; The two ends of the boom are fixedly provided with second pin plates; The joint truss is connected to the second pin plate at the upper end of the hanger via the first pin plate, thereby enabling flexible transfer of vertical loads and adaptability to rotation at the joint.

5. The large-span prefabricated truss suspension support system according to claim 3, characterized in that, The lower universal support includes a first universal support component and a clamping sliding node disposed on the first universal support component; The clamping sliding node includes an upper clamping beam and a lower clamping beam; The upper clamping beam and the lower clamping beam are connected by long bolts; The upper clamping beam and the lower clamping beam clamp the first general-purpose support member from above and below; Both the upper clamping beam and the lower clamping beam are provided with a third pin plate at the end away from the first general support member, for pin connection with the second pin plate provided on the hanger rod.

6. The large-span prefabricated truss suspension support system according to claim 5, characterized in that, The upper and lower clamping beams are long beam structures, with their length direction perpendicular to the axis of the first universal support member, and multiple first universal support members on the horizontal plane are clamped between the same pair of upper and lower clamping beams.

7. The large-span prefabricated truss suspension support system according to claim 6, characterized in that, The upper truss support also includes a variable cross-section transfer truss; The variable cross section transfer truss includes a variable cross section transfer truss upper chord, a variable cross section transfer truss lower chord, a variable cross section transfer truss upper diagonal web member, a variable cross section transfer truss lower diagonal web member, a variable cross section transfer truss vertical support member, a second field-installed diagonal cross web member, and a variable cross section transfer truss connector. The upper chord of the variable cross-section transfer truss is arranged parallel to the lower chord of the variable cross-section transfer truss. The variable cross-section transfer truss has an integrally provided upper diagonal web member at the end of the upper chord member; The lower chord end of the variable cross-section transfer truss is integrally provided with a variable cross-section transfer truss inclined lower web member; The upper and lower diagonal web members of the variable cross-section transfer truss meet at the end of the variable cross-section transfer truss connector, forming a stable triangular force system. The vertical support rod of the variable cross-section transfer truss is connected between the upper chord and the lower chord of the variable cross-section transfer truss; A third connecting web is provided at the angle where the upper chord of the variable cross-section transfer truss is perpendicularly connected to the vertical support rod of the variable cross-section transfer truss, and at the connection point where the lower chord of the variable cross-section transfer truss is connected to the vertical support rod of the variable cross-section transfer truss. The second on-site installed diagonal cross brace is set within the rectangular space enclosed by the upper chord of the variable cross section transfer truss, the lower chord of the variable cross section transfer truss, the upper chord of the standard truss, the lower chord of the standard truss, the vertical support rod of the standard truss, and the vertical support rod of the variable cross section transfer truss. The four ends of the second field-installed oblique cross web are respectively fixedly connected to the two third connecting webs and the two first connecting webs at the four corners of the rectangular space.

8. The large-span prefabricated truss suspension support system according to claim 7, characterized in that, A reinforcing web is provided in the triangular area formed by the upper diagonal web member of the variable cross-section transfer truss, the lower diagonal web member of the variable cross-section transfer truss, and the vertical support member of the variable cross-section transfer truss; The reinforcing web is provided with grid-like reinforcing stiffeners to improve the shear and torsional stiffness of the reinforcing web; A third connecting end plate is provided at the end of the upper chord and the lower chord of the variable cross-section transfer truss that is away from the connector of the variable cross-section transfer truss. The third connecting end plate is fastened to the first connecting end plate.

9. The large-span prefabricated truss suspension support system according to claim 7, characterized in that, The upper truss support also includes a conversion joint; The transition joint includes a stiffened I-beam and transverse tie rods; The transverse tie rods connect multiple stiffened I-beams, and each stiffened I-beam is connected to a variable cross-section conversion truss. A fourth connection end plate is provided at one end of the variable cross-section conversion truss connector near the conversion joint; The stiffened I-beam is provided with a fifth connecting end plate and a sixth connecting end plate at both ends; The fourth connecting end plate on the variable cross-section conversion truss connector is fastened to the fifth connecting end plate on the stiffening I-beam.

10. The large-span prefabricated truss suspension support system according to claim 9, characterized in that, It also includes the crown beam; The sixth connecting end plate is directly or indirectly connected to the cap beam; The cap beam is set at the top of the retaining piles; It also includes a second general-purpose support component; One end of the second general-purpose support member is connected to the sixth connecting end plate, and the other end is connected to the cap beam; It also includes a second supporting column; The top of the second support column is fixedly mounted on the lower end surface of the second universal support component; The bottom end of the second support column passes through the first universal support member of each layer and is fixed to the ground after being connected to the first universal support member of each layer, so as to provide upward support force to the first universal support member and the second universal support member.

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