Standard steel bracing resource hub platform and construction method for connecting foundation pit partitions

Abstract

The present application relates to the technical field of deep foundation pit support, and provides a standard steel support resource hub platform and a construction method for connecting foundation pit partitions, the platform comprising vertical supports and horizontal supports arranged in a foundation pit; the vertical supports are multiple rows of vertical columns, and the vertical columns are arranged along the transverse and longitudinal directions of the foundation pit respectively; the horizontal supports are provided in at least one layer, and each layer of horizontal supports comprises a plurality of standard steel supports, each standard steel support is horizontally connected to adjacent vertical columns and located in the same horizontal plane; an assembled steel trestle plate is laid on a top layer support plane formed by the top layer horizontal support and the vertical columns, and the assembled steel trestle plate is connected to the upper flanges of the standard steel supports. The present application provides a new path for the application of full recycling and multi-cycle standard steel support structures in the partitioned blocks of super-large area foundation pits, the horizontal supports are arranged in a "crossed bidirectional" longitudinal and transverse manner to cooperatively reduce the support calculation length, the support performance is improved, and standardized design, modular construction and multi-cycle utilization are realized.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit support technology, specifically to a standard steel support resource hub platform and construction method for connecting foundation pit zones. Background Technology

[0002] The increasing development of urban underground space has transformed deep foundation pit engineering from a simple support structure into a systematic project that closely interacts with the surrounding environment, presenting numerous technical challenges. Especially in complex environments such as urban core areas, subway interchanges, and areas with dense high-rise buildings, foundation pit support structures not only need to ensure safety and stability but also need to consider multiple objectives such as construction efficiency, spatial adaptability, and resource recyclability.

[0003] Currently, most common steel bracing systems for foundation pits adopt independent bracing or corner bracing. In this type of system, each brace acts as an independent axially compressed member, with a calculated length equal to the entire span of the bracing. This results in a large calculated length and low stability bearing capacity. Furthermore, the lack of effective connections between the braces makes it difficult to form an overall stiffness that collaboratively resists foundation pit deformation, leading to insufficient structural safety redundancy.

[0004] In deep foundation pit engineering, a zoned, layered, and phased excavation strategy is often adopted to adapt to different construction stages or functional requirements of different areas. However, the fixed length of components in traditional support systems makes it difficult to flexibly adapt to changes in the span of different zones. Repeated disassembly and reassembly of supports are often required during zone transitions, affecting construction efficiency and introducing safety risks. Furthermore, the arrangement of supports is often limited by the location of the main structure's piles, resulting in poor flexibility. The coexistence of dense independent supports and temporary scaffolding within the foundation pit leads to narrow working spaces and poor passage, increasing safety hazards such as falling objects and falls from heights, and also hindering construction safety supervision and management.

[0005] On the other hand, most existing foundation pit support structures are temporary facilities with poor coordination with the underground main structure. They need to be dismantled after construction, failing to effectively utilize the main structure piles as a component of the support system. This not only does not conform to the concepts of green construction and sustainable development, but also results in material waste.

[0006] Therefore, it is necessary to provide a support platform system that can achieve rigid connection of support components, high overall stiffness, strong deformation control capability, convenient construction and recyclability, in order to meet the technical needs of deep foundation pit engineering developing towards deeper, more complex and more environmentally sensitive directions, and to meet the industry's requirements for the safety, greening and high-quality development of foundation pit engineering. Summary of the Invention

[0007] To address the problems existing in the background technology, this invention proposes a standard steel support resource hub platform and construction method for connecting foundation pit zones. By introducing a rigid platform, it provides a new path for the application of fully recyclable, multi-cycle standard steel support structures in the zoning of ultra-large area foundation pits. It solves the problem of uncontrollable "parallel unidirectional" deformation of horizontal supports, upgrading it to "cross-bidirectional" longitudinal and transverse coordination. This not only improves the support performance but also provides a new path for the standardized design, modular construction, and permanent utilization of foundation pit engineering, meeting the requirements of green construction and safe construction.

[0008] To achieve the above objectives, the present invention adopts the following solution:

[0009] A standard steel support resource hub platform connecting the foundation pit zones includes vertical supports and horizontal supports deployed within the foundation pit; the vertical supports consist of multiple rows of vertical columns, which are arranged along the transverse and longitudinal directions of the foundation pit respectively; the horizontal supports are provided at least one layer, and each layer of the horizontal supports includes several standard steel supports, each of which is horizontally connected to adjacent vertical columns and located in the same horizontal plane; prefabricated steel trestle panels are laid on the top support plane formed by the top horizontal supports and vertical columns, and the prefabricated steel trestle panels are connected to the upper flanges of the standard steel supports.

[0010] Optionally, the standard steel bracing includes orthogonal steel bracing and diagonal steel bracing. The orthogonal steel bracing is orthogonally connected to adjacent vertical columns, and the diagonal steel bracing is located at the corner of the integrated pile-column platform and diagonally connected to the adjacent vertical columns at the corner.

[0011] Optionally, the vertical column is a standard steel column or a reinforced concrete pile with a rectangular cross-section at the top and a circular cross-section at the bottom, and the reinforced concrete pile is formed by drilling and casting in one go.

[0012] Optionally, the number of vertical columns arranged longitudinally or laterally... m Determined by satisfying the following formula: , in, The design horizontal resultant force in this direction is calculated from the earth pressure. The design bearing capacity of a single standard steel column in this direction is calculated as a compression-bending member. This indicates rounding up to the nearest integer.

[0013] Optionally, for any direction, the spacing between adjacent vertical columns satisfy: , Where S represents the effective support width in that direction, m Root parallel steel supports along the span S Distribute evenly.

[0014] Optionally, the angle of arrangement of the diagonal steel bracing θ The spacing between the longitudinal, transverse, and vertical columns in the orthogonal directions is determined, satisfying the following: ,in, , The support spacing is between two mutually perpendicular directions.

[0015] Optionally, the number of layers of the horizontal support n Determined by the excavation depth of the foundation pit, satisfying: , in, H This refers to the depth of the foundation pit excavation. h To support the vertical design spacing, horizontal supports are arranged at the corresponding elevation and connected to the vertical columns on each floor.

[0016] Optionally, the prefabricated steel trestle plate is an octagonal plate, which integrates lifting rings and assembly positioning holes.

[0017] The construction method for a standard steel-supported resource hub platform connecting the foundation pit zones includes the following steps: Step 1: Based on the excavation depth of the foundation pit, the design horizontal resultant force, and the design parameters of the bearing capacity of a single standard steel brace, calculate and determine the number of vertical columns to be laid along the longitudinal and transverse directions of the foundation pit, the support spacing, the arrangement angle of the diagonal steel braces, and the number of horizontal support layers; clean the construction site and conduct surveying and layout, mark the center position of all vertical columns, and verify the specifications and hole positions of the prefabricated components. Step 2, Vertical support construction: Construct vertical columns at the marked locations. The vertical columns are standard steel columns or reinforced concrete piles with a rectangular upper section and a circular lower section. The reinforced concrete piles are formed by drilling and pouring in one go. Step 3, Standard steel bracing installation: Install horizontal supports at the design elevation. The horizontal supports include orthogonal steel supports and diagonal steel supports. The orthogonal steel supports are orthogonally connected to adjacent vertical columns, and the diagonal steel supports are located at the corners of the platform and diagonally connected to adjacent vertical columns. All steel supports are rigidly connected to the vertical columns by node connection plates and high-strength bolts or welding. Step 4, Multi-layer support platform construction: Based on the number of support layers and vertical spacing, repeat step 3 to install standard steel supports layer by layer to form a multi-layer grid-like rigid platform; Step 5, Prefabricated steel trestle deck laying: On the top support plane formed by the top horizontal support and the vertical column, lay the prefabricated steel trestle deck and connect it to the upper flange of the standard steel support. Step 6, Pit Zoning Construction and Support Adjustment: Combine the rigid node platform with the support system in the pit to form zoning intersection nodes in the pit; use the prefabricated steel trestle as the working surface to carry out zoning earthwork excavation and main structure construction; according to construction needs, partially disassemble or adjust the standard steel supports on the existing platform. Step 7, Platform Dismantling or Permanent Retention: After construction is completed, dismantle and recycle the standard steel supports, standard steel columns, and prefabricated steel trestle panels; retain the reinforced concrete piles as permanent structures.

[0018] Optionally, step 2 specifically includes: When using standard steel columns, the foundation is constructed at the marked location and the standard steel columns are hoisted, then fixed after the verticality is corrected; when using reinforced concrete piles, a special drilling rig is used to drill a pile hole at the designed pile location in one go to form a rectangular upper part and a circular lower part, then a special-shaped steel cage is placed down and concrete is poured to form an integrated pile-column structure as a permanent column.

[0019] The beneficial effects of this invention are as follows: First, this solution achieves overall coordinated force distribution of the support system by setting up a rigid node platform within the ultra-large foundation pit, constructed by connecting vertical and horizontal supports through node connection plates. This rigid node platform forms a closed force-bearing unit, effectively reducing the calculated length of the support components, improving the overall stiffness and stability of the support system, and thus enhancing the control capability against lateral deformation. Simultaneously, this rigid node platform participates in sharing horizontal loads and optimizing the support force path. Loads can be redistributed and transferred among the supports through the rigid node platform, thereby reducing the amount of standard steel supports and the number of components required for turnover, reducing material input and installation / dismantling workload, resulting in significant structural optimization and good economic efficiency. Furthermore, the combination of the rigid node platform and the steel support system forms zoned intersection nodes within the ultra-large foundation pit, allowing supports in different directions to converge and connect with construction sections at the platform, thereby realizing zoned and segmented excavation of the foundation pit and cyclical construction organization, expanding the application scenarios and scale of fully recyclable standardized supports.

[0020] Moreover, combined with the installation of prefabricated steel trestle panels, this rigid node platform simultaneously fulfills three major functions: structural support, traffic access, and working platform, realizing "structure as platform." Structurally, it participates in overall load-bearing as a horizontal support component; in terms of traffic, it serves as a transportation channel for construction vehicles and equipment; and operationally, it functions as a platform for material stacking and equipment operation. Furthermore, this platform can flexibly adapt to foundation pits of different sizes and shapes. Whether it's a rectangular pit or other irregularly shaped pits, full coverage can be achieved by adjusting the number and angle of supports, adapting to diverse layout requirements of foundation pits based on a limited number of standard modules.

[0021] Meanwhile, the platform adopts an independent recyclable steel structure system, namely, the horizontal support consists of several standard steel braces, the vertical columns can be standard steel columns, and the horizontal plane is laid with prefabricated steel trestle panels. All the above steel structure components are assembled through a detachable connection method. After the foundation pit is backfilled, the components can be completely and without damage, realizing the standardized design and recycling of the support system, which greatly reduces the project cost and resource consumption, and meets the conservation requirements of green construction.

[0022] Furthermore, the platform can be designed in conjunction with permanent structures. Specifically, when there are main structural piles within the foundation pit, reinforced concrete piles can be used. Part of the load is borne by the permanent piles, forming a statically indeterminate system where temporary supports and permanent structures work together. This further enhances the overall structural stiffness and eliminates the need for both temporary support removal and permanent structure reconstruction, saving time and costs, and improving construction efficiency, space utilization, and material turnover, thus meeting the requirements of green construction and safe construction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the platform of the present invention without the prefabricated steel trestle deck; Figure 2 This is a top view of the platform structure of the present invention; Figure 3 This is a schematic diagram of the main structure of the platform of the present invention; Figure 4 This is a schematic diagram of the single-piece assembled steel trestle structure of the present invention; Figure 5 This is a top-view structural diagram of the platform of the present invention within an ultra-large foundation pit.

[0024] The following are the labels in the diagram: 1. Standard steel bracing; 101. Diagonal steel bracing; 102. Orthogonal steel bracing; 2. Vertical column; 3. Prefabricated steel trestle; 4. Support system; 5. Ultra-large foundation pit; 6. Rigid node platform. Detailed Implementation

[0025] To make the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the given embodiments are merely one implementation method and do not represent all embodiments.

[0026] Example 1 Combination Figures 1-4 This invention provides a standard steel support 1 resource hub platform connecting different sections of a foundation pit. It includes vertical and horizontal supports deployed within the foundation pit. These supports are connected by node connection plates to form a rigid node platform 6, enabling the support system to achieve overall coordinated force bearing. The vertical supports consist of multiple rows of vertical columns 2, arranged regularly along the transverse and longitudinal directions of the foundation pit, forming a grid-like support system.

[0027] The horizontal support is provided at least once, and each layer of the horizontal support includes several standard steel supports 1. Each standard steel support 1 is horizontally connected to an adjacent vertical column 2 and is located in the same horizontal plane. The top layer of horizontal support and vertical columns 2 together form the top layer support plane. Prefabricated steel trestle panels 3 are laid on this plane. The prefabricated steel trestle panels 3 are connected to the upper flanges of the standard steel supports 1 to form a working platform that can be used by construction machinery and personnel.

[0028] Specifically, the standard steel brace 1 includes orthogonal steel braces 102 and diagonal steel braces 101. The orthogonal steel braces 102 orthogonally connect adjacent vertical columns 2 in the transverse or longitudinal direction, forming the main horizontal force transmission path. The diagonal steel braces 101 are mainly arranged at the corners of the pile-column integrated platform, diagonally connecting adjacent vertical columns 2 at the corners, to enhance the overall torsional and lateral displacement resistance of the platform.

[0029] The angle of arrangement of the diagonal steel brace 101 θ The spacing of the vertical and horizontal columns 2 is determined by the following relationship: , in, , The support spacing is between two mutually perpendicular directions.

[0030] Specifically, the vertical column 2 can be selected from two structural forms according to the design scheme: one is a standard steel column, and the other is a reinforced concrete pile column with a rectangular cross section at the top and a circular cross section at the bottom. In the case where there is no main structure available, the standard steel column is selected to facilitate processing and installation. In the case where there are main structure pile columns in the foundation pit, the reinforced concrete pile column is selected. The reinforced concrete pile column is formed by drilling and pouring in one go, which can realize the structural integration design of pile and column.

[0031] Furthermore, the number of standard steel columns installed along a certain direction (lateral or longitudinal) of the foundation pit. m Determined by the following formula: , in, The design horizontal resultant force in this direction is calculated from the earth pressure. The design bearing capacity of a single standard steel column in this direction is calculated as a compression-bending member. This indicates rounding up to the nearest integer.

[0032] Spacing between adjacent standard steel columns satisfy: , Where S represents the effective support width in that direction,m Standard steel columns along the span S Distribute evenly.

[0033] Specifically, the number of layers of horizontal support n Determined by the excavation depth of the foundation pit, satisfying: , in, H This refers to the depth of the foundation pit excavation. h To support the vertical design spacing, horizontal supports are arranged at the corresponding elevation and connected to the vertical column 2 on each floor.

[0034] The prefabricated steel trestle plate 3 adopts an octagonal plate design, with lifting rings and assembly positioning holes integrated on the plate, which facilitates hoisting and rapid on-site positioning and installation, realizing modular construction.

[0035] The aforementioned rigid node platform 6 simultaneously fulfills three major functions: structural support, traffic access, and working platform, realizing the concept of "structure as platform." Structurally, it participates in overall load-bearing as a horizontal support component; in terms of traffic, it serves as a transportation channel for construction vehicles and equipment; and operationally, it functions as a work platform for material storage and equipment operation. Furthermore, this platform can flexibly adapt to rectangular and irregular foundation pits, achieving full coverage by adjusting the number and angle of supports, and meeting diverse foundation pit layout requirements with standard modules.

[0036] In the super-large foundation pit 5, such as Figure 5 The rigid node platform 6 enables the entire support system of the foundation pit to share the load collaboratively, forming a closed stress unit. This effectively reduces the calculated length of the supports, improves the overall stiffness and stability of the support system within the foundation pit, and enhances the control capability for lateral deformation of the foundation pit. The rigid node platform 6 can participate in the sharing of horizontal loads and optimize the stress path, realizing the redistribution and transfer of loads among the supports. This reduces the amount of steel supports used and the number of times they are reused, reducing material input and installation / dismantling workload, resulting in significant economic benefits. Simultaneously, the rigid node platform 6, combined with the support system 4, can form zoned intersection nodes within the foundation pit, enabling zoned and block excavation and cyclical construction organization, further expanding the application scenarios and applicable scale of fully recoverable standardized supports.

[0037] In addition, the rigid node platform 6 adopts an independent recyclable steel structure system. All steel structure components are assembled through detachable connections. After the foundation pit is backfilled, the components can be completely and without damage. This realizes the standardized design and recycling of the support system, which greatly reduces engineering costs and resource consumption, and meets the conservation requirements of green construction.

[0038] Example 2 This embodiment provides a construction method for a standard steel-supported resource hub platform connecting foundation pit zones, including the following steps: Step 1: First, based on the foundation pit support engineering design drawings and geological survey report, determine the excavation depth of the foundation pit. H 1. Soil layer parameters and design loads. 2. Calculate the design horizontal resultant force (including longitudinal and transverse forces) on each sidewall of the foundation pit under each excavation condition, based on earth pressure theory (such as Rankine's earth pressure theory). 3. Calculate the number of standard steel columns required to be installed along the longitudinal and transverse directions of the foundation pit according to the formula, based on the calculated horizontal resultant force. m Its formula is: .

[0039] After determining the number of columns, the spacing between adjacent standard steel columns in this direction is determined based on the foundation pit plan dimensions and the effective support width S. Its formula is: .

[0040] The arrangement angle of the diagonal steel brace 101 θ The spacing of the vertical columns 2, both longitudinally and laterally, is determined according to the formula: .

[0041] Number of horizontally supported layers n Based on the excavation depth of the foundation pit H Vertical spacing of supports determined by the design h The value is determined by the formula and rounded up. The formula is as follows: .

[0042] After completing the calculations, the construction site within the foundation pit was cleaned and leveled, and obstacles affecting the hoisting and installation of the steel structure were removed. Based on the calculation results, precise measurements and layout were conducted, and the center pile positions of all vertical columns 2 were marked on-site using equipment such as a total station. Simultaneously, the specifications, dimensions, reserved hole positions, and lifting rings of the prefabricated components (including standard steel supports 1, standard steel columns, node connection plates, and prefabricated steel trestle panels 3, etc.) were inspected and verified upon arrival at the site.

[0043] Step 2, Construction of Vertical Column 2 Based on the design, select either type 2 vertical column, i.e., standard steel column or reinforced concrete pile column: Construction of Standard Steel Columns: Construct independent concrete foundations or pile caps at the marked pile locations. After the foundation reaches sufficient strength, use precast standard steel columns and a theodolite to correct their verticality. The deviation must be controlled within the allowable range specified in the code, such as a verticality allowable deviation of L / 1000, meaning the column's vertical offset must not exceed one-thousandth of its height, where L is the column's height. After correction, securely connect the lower end of the standard steel column to the foundation using column base anchors.

[0044] Construction of reinforced concrete piles: At the designed pile location, a specialized drilling rig capable of irregularly shaped holes is used to drill a pile hole with a combined cross-section of rectangular upper section and circular lower section in one operation. The dimensions of the rectangular section match the external dimensions and bolt hole positions of the node connection plate, and the embedded parts are positioned and fixed during the pile concrete pouring stage to ensure that the subsequent standard steel brace 1 can be rigidly connected to the pile through the node connection plate. The circular section meets the load-bearing requirements of the pile foundation. After drilling, a pre-tied and irregularly shaped steel cage matching the pile hole is hoisted and placed. Concrete is then poured continuously in one operation to form an integrated reinforced concrete pile structure extending from the bottom of the foundation pit to the design elevation, serving as a permanent vertical support.

[0045] Step 3, Standard steel support 1 installation: Install horizontal supports at the design elevation of each floor.

[0046] First, install the orthogonally arranged standard steel supports 1: hoist the prefabricated transverse and longitudinal orthogonal steel supports to the designated position, aligning their two ends with the adjacent vertical columns 2. Using node connection plates pre-welded to the vertical columns 2, rigidly connect the ends of the orthogonal steel supports 102 to the vertical columns 2 using a group of high-strength bolts, or perform on-site welding to ensure that the nodes can transmit axial force, shear force, and bending moment.

[0047] After all orthogonal steel supports 102 on this floor are installed and secured, diagonal steel supports 101 are installed at the four corners of the main load-bearing frame. Based on the angles calculated in step 1, the diagonal steel supports 101 are hoisted into place, with one end connected to the corner vertical column 2 and the other end connected to the diagonally adjacent far vertical column 2. Rigid connections are made using the same node connection method (high-strength bolts or welding) as the orthogonal steel supports 102.

[0048] After the diagonal steel brace 101 is installed, it together with the orthogonal steel brace 102 and the vertical column 2 to form a closed support platform with strong lateral stiffness, which significantly improves the overall stability and torsional resistance of the platform.

[0049] Step 4, Multi-layer support platform construction: Based on the number of support layers n and the elevation of each layer determined in the design, repeat the construction process of Step 3, constructing horizontal supports layer by layer from top to bottom to form a spatial multi-layer grid-like rigid platform system, effectively controlling the deformation of the foundation pit during the excavation process.

[0050] Step 5, Installation of Prefabricated Steel Trestle Panels 3: After the horizontal supports of each layer are installed and accepted, the work platform is laid using prefabricated standardized prefabricated steel trestle panels 3. In this embodiment, octagonal steel plates with stiffening ribs are preferred. The prefabricated steel trestle panels 3 are hoisted onto the top support plane formed by the top horizontal supports and vertical columns. Their pre-drilled holes are aligned with the reserved holes on the upper flange of the standard steel supports 1 below, and high-strength bolts are used for connection and fixation, so that each standard steel support 1 is connected as a whole in the plane. The laid steel trestle panels form a continuous and flat construction passage and work surface.

[0051] Step 6, Pit Zoning Construction and Support Adjustment: The rigid node platform 6 is combined with the support system 4 within the pit to form zoning intersection nodes within the pit, allowing supports and construction sections from different directions to converge and connect at the platform. Simultaneously, the prefabricated steel trestle platform 3 serves as the main working surface and material storage area, organizing and implementing zoning and layered excavation of the pit excavation and subsequent main structure construction. During excavation and structural construction, this platform system, acting as a horizontal force transmission system, effectively transmits and redistributes construction loads and soil and water pressures. If adjustments to the pit zoning boundaries or support spans are required for construction, the prefabricated nature of the platform allows for partial disassembly or addition of standard steel supports 1 in the corresponding areas, achieving dynamic and adjustable support systems and avoiding the drawbacks of traditional overall support demolition and reconstruction.

[0052] Step 7, Platform Demolition or Permanent Retention: After the foundation pit construction and underground main structure are completed, the demolition stage begins, and the platform is demolished according to the principle of slab first, then support, and top to bottom.

[0053] First, disconnect the prefabricated steel trestle panel 3 from the standard steel support 1, then lift, collect, and maintain them in sections for reuse in subsequent projects. Second, dismantle the standard steel support 1 (including orthogonal steel support 102 and diagonal steel support 101) layer by layer from top to bottom, finally removing the standard steel columns and foundation. During dismantling, disconnect the joint connections, hoist the standard steel support 1 components off-site, perform repairs and anti-corrosion treatment, and then store them in the warehouse.

[0054] In addition, for the integrated pile-column structure, only the prefabricated steel trestle panel 3 and standard steel support 1 located above the bottom of the foundation pit are removed, while the piles and columns are retained as permanent structures. With this, the entire construction process is complete.

[0055] This construction method combines temporary support with permanent structure, allows for segmented excavation of the foundation pit, and enables cyclical construction, thereby improving construction efficiency, space utilization, and material turnover, and meeting the requirements of green building and safe construction.

[0056] The specific embodiments of the present invention have been described in detail above with reference to the figures, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A construction method for a standard steel-supported resource hub platform connecting foundation pit zones, characterized by: The platform includes vertical supports and horizontal supports installed in the foundation pit; the vertical supports are multiple rows of vertical columns (2), which are arranged along the transverse and longitudinal directions of the foundation pit respectively; the horizontal supports are at least one layer, and each layer of the horizontal supports includes several standard steel supports (1), each of the standard steel supports (1) is horizontally connected to the adjacent vertical columns (2) and located in the same horizontal plane; the top support plane formed by the top horizontal supports and the vertical columns (2) is covered with prefabricated steel trestle plates (3), which are connected to the upper flanges of the standard steel supports (1); The construction method includes the following steps: Step 1: Based on the excavation depth of the foundation pit, the design horizontal resultant force, and the design parameters of the bearing capacity of a single standard steel brace (1), calculate and determine the number of vertical columns (2) to be laid out along the longitudinal and transverse directions of the foundation pit, the support spacing, the arrangement angle of the diagonal steel brace (101), and the number of horizontal support layers; clean up the construction site and conduct surveying and layout, mark the center position of all vertical columns (2), and verify the specifications and hole positions of the prefabricated components; Step 2, Vertical support construction: Construct vertical columns (2) at the marked points. The vertical columns (2) are standard steel columns or reinforced concrete piles with a rectangular cross-section at the top and a circular cross-section at the bottom. The reinforced concrete piles are formed by drilling and pouring in one go. Step 3, standard steel bracing (1) installation: Install horizontal bracing at the design elevation. The horizontal bracing includes orthogonal steel bracing (102) and diagonal steel bracing (101). The orthogonal steel bracing (102) is orthogonally connected to adjacent vertical columns (2). The diagonal steel bracing (101) is located at the corner of the platform and diagonally connected to adjacent vertical columns (2). All steel bracing is rigidly connected to the vertical columns (2) by node connecting plates and high-strength bolts or welding. Step 4, Multi-layer support platform construction: Based on the number of support layers and vertical spacing, repeat step 3 to install standard steel supports (1) layer by layer. Step 5, Prefabricated steel trestle (3) laying: On the top plane formed by the horizontal support and vertical column (2) of the top layer, prefabricated steel trestle (3) is laid and connected to the upper flange of the standard steel support (1) to form a rigid node platform (6). Step 6, Pit zoning construction and support adjustment: Combine the rigid node platform (6) with the support system (4) in the pit to form a zoning intersection node in the pit; at the same time, use the prefabricated steel trestle (3) as the working surface to carry out zoning earthwork excavation and main structure construction; according to construction needs, partially disassemble or adjust the standard steel support (1) on the existing platform. Step 7, Platform dismantling or permanent retention: After construction is completed, dismantle the standard steel supports (1), standard steel columns and prefabricated steel trestle panels (3) and recycle them; retain the reinforced concrete piles as permanent structures.

2. The construction method of the standard steel-supported resource hub platform connecting the foundation pit zones according to claim 1, characterized in that: The number of standard steel columns arranged longitudinally or laterally m Determined by satisfying the following formula: ， in, The design horizontal resultant force in this direction is calculated from the earth pressure. The design bearing capacity of a single standard steel column in this direction is calculated as a compression-bending member. This indicates rounding up to the nearest integer.

3. The construction method of the standard steel-supported resource hub platform connecting the foundation pit zones according to claim 1, characterized in that: For any direction, the spacing between adjacent standard steel columns satisfy: ， Where S represents the effective support width in that direction, m Standard steel columns along the span S Distribute evenly.

4. The construction method of the standard steel-supported resource hub platform connecting the foundation pit zones according to claim 1, characterized in that: The angle of arrangement of the diagonal steel brace (101) θ The spacing of the longitudinal, transverse, and vertical columns (2) in the orthogonal directions is determined, satisfying: ,in, , The support spacing is between two mutually perpendicular directions.

5. The construction method of the standard steel-supported resource hub platform connecting the foundation pit zones according to claim 1, characterized in that: The number of horizontal support layers n Determined by the excavation depth of the foundation pit, satisfying: ， in, H This refers to the depth of the foundation pit excavation. h For the vertical design spacing of the support, the horizontal support of each floor is arranged at the corresponding elevation and connected to the vertical column (2).

6. The construction method of the standard steel-supported resource hub platform connecting the foundation pit zones according to claim 1, characterized in that: The assembled steel trestle plate (3) is an octagonal plate, which integrates lifting rings and assembly positioning holes.

7. The construction method of the standard steel-supported resource hub platform connecting the foundation pit zones according to claim 1, characterized in that, Step 2 specifically includes: When using standard steel columns, the foundation is constructed at the marked location and the standard steel columns are hoisted, then fixed after the verticality is corrected; when using reinforced concrete piles, a special drilling rig is used to drill a pile hole at the designed pile location in one go to form a rectangular upper part and a circular lower part, then a special-shaped steel cage is placed down and concrete is poured to form an integrated pile-column structure as a permanent column.

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