Installation method for high-altitude large-span steel structure corridor

Abstract

The invention discloses a mounting method of a high-altitude large-span steel structure corridor, which comprises the following steps of: S1, a segmented prefabrication step: respectively processing each side of a main truss of the corridor into at least two small trusses, transporting the small trusses to a site, and assembling the small trusses to form the main truss; s2, a lifting point calculation and selection step: calculating the gravity center position of the main truss, and selecting a connection intersection point of a web member and an upper chord member on two sides of the gravity center as a lifting point; s3, a hoisting and in-place step: hoisting the main truss through a hoisting point by using hoisting equipment, and enabling the main truss to be positioned on the high-altitude support; s4, temporary stabilization: a steel wire rope is arranged on the primary truss with the first truss in place in a pulling mode, and after the steel wire rope is adjusted to be stable, the hoisting equipment can be unhooked; and S5, overall stabilization is conducted, specifically, connecting components are installed between the adjacent main trusses, and the steel wire ropes are removed. According to the construction method, the technical problems in the installation of the high-altitude large-span steel structure corridor are solved through the processes of segmental prefabrication, precise hoisting, temporary stabilization and integral forming, and safe, economical and efficient construction is achieved.

Description

Technical Field

[0001] This invention relates to the field of steel structure building construction technology, specifically to an installation method for a high-altitude, large-span steel structure connecting corridor. Background Technology

[0002] In modern public buildings and high-rise buildings, high-altitude, large-span steel structure corridors are often designed to connect different buildings and enrich their functions and forms. The installation and construction of these corridors is a key and challenging aspect of the project, characterized by their large span, high installation position, heavy weight, and high precision requirements, resulting in significant construction difficulties and safety risks.

[0003] Traditional installation methods typically employ either monolithic hoisting or high-altitude assembly. Monolithic hoisting places extremely high demands on lifting equipment capacity and is often difficult to implement due to site and transportation limitations. High-altitude assembly requires the erection of large-scale temporary support platforms or full-scale scaffolding at heights, which is not only costly and time-consuming but also involves a massive amount of work at height, concentrating safety risks and making it difficult to guarantee construction quality (especially docking accuracy and welding quality). Even slight errors during construction can easily lead to major safety accidents such as structural instability and falls.

[0004] Existing technologies include some construction platform solutions for the later-stage curtain wall decoration of connecting corridors, which solve the external construction problems after the main structure of the corridor is completed. However, they do not address the fundamental challenge of how to safely, efficiently, and accurately install the main structure of the corridor itself. Therefore, there is an urgent need for an installation method specifically designed for the main structure of high-altitude, large-span steel structure connecting corridors to solve the aforementioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method for installing high-altitude, large-span steel structure corridors. This method, through a systematic process of "segmented prefabrication, precise hoisting, temporary stabilization, and overall forming," aims to solve the technical challenges of high difficulty, low precision, and high risk in the installation of high-altitude, large-span steel structure corridors, achieving safe, economical, and efficient construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An installation method for a high-altitude, long-span steel structure connecting corridor includes the following steps: S1, segmented prefabrication step: each side of the main truss of the connecting corridor is processed into at least two small trusses, transported to the site and assembled to form the main truss to be hoisted; S2. Lifting point calculation and selection steps: Calculate the position of the center of gravity of the main truss, and select the connection points of the web members and the upper chord on both sides of the center of gravity as lifting points; S3. Lifting and positioning steps: Use lifting equipment to lift the main truss through the lifting points and position it on the high-altitude support; S4. Temporary stabilization step: After the first main truss is in place, a steel wire rope is pulled and the steel wire rope is adjusted to stabilize it before the lifting equipment can be unhooked. S5. Overall stabilization step: After installing connecting components between adjacent main trusses to form a stable overall structure, remove the steel wire rope.

[0007] Furthermore, in step S3, a steel pipe sheet is placed at the contact point between the wire rope at the lifting point and the corner of the main truss as a corner protection component to prevent the wire rope from being cut by the corner and to protect the truss coating.

[0008] Furthermore, step S3 specifically includes: ensuring that the lowest point of the main truss is always higher than the set height of the bracket of the support (e.g., about 1 meter) during the hoisting process; and after the height of the support end of the main truss is basically consistent with the installation height, using a hand-operated hoist to precisely position it on the support. This method enables fine-tuning and positioning of large components at high altitudes.

[0009] Furthermore, in step S4, there are at least four steel wire ropes, and a hand-operated hoist is provided to adjust their tension, ensuring the spatial stability of a single truss before it is formed as a whole.

[0010] Furthermore, in step S5, the connecting component includes horizontal supports and vertical diagonal braces. After the connecting component is installed, the main truss forms a stable spatial frame structure, at which point the temporary steel wire rope can be removed.

[0011] Furthermore, in step S1, when assembling the small truss on site, a weld gap (e.g., 10 mm) is reserved at the joint, and the amount of camber during assembly is controlled to counteract the deflection caused by the structure's own weight.

[0012] Furthermore, the camber during assembly is a positive camber, and the control value is within 1 / 5000 of the beam span to ensure that the final installation form meets the design requirements.

[0013] Furthermore, following step S5, step S6, component installation, is also included: on the main truss that forms a stable whole, the remaining component structures of the connecting corridor, such as secondary beams and floor decking, are installed.

[0014] Furthermore, the end of the steel wire rope away from the main truss is anchored to the existing main structure adjacent to the connecting corridor.

[0015] Process flow: For the on-site pre-assembly and hoisting of the steel structure corridor truss, a 3D model was drawn to visualize complex nodes and facilitate understanding by construction personnel.

[0016] After the small trusses are processed and inspected at the steel structure processing plant, they are transported to the construction site for assembly to form the main truss. The main truss is assembled at the designated construction site, and the working surface is controlled by a level to ensure that the truss working surface is level.

[0017] After the first truss is horizontally positioned, check its location and orientation to ensure they are appropriate, and prepare the welding equipment. After the second truss is hoisted into place, it is joined to the first truss. Jointing precautions: The two trusses must be level on the same plane. A 10mm gap should be reserved at the joint for the weld seam. The weld bevel should face upwards. The camber of both trusses should be controlled in advance, within ±1 / 5000 of the design beam length. Based on practical experience, a positive camber of 12mm is required (which will perfectly meet the design requirements after positioning). No downward deflection is allowed.

[0018] E50 welding wire is used for welding, and carbon dioxide gas shielded welding is employed. Welders are certified to work. Before welding, tack welding is performed to fix the joints, and the dimensions, positions, and levelness are checked to ensure they are correct before welding. After welding, the weld is ground, and after the weld passes inspection, anti-corrosion paint and fire-retardant coating are applied.

[0019] The crane selection should be based on the weight of the main truss to be lifted, the lifting height, and the working radius. The location of the truck crane should be selected according to the actual site conditions, and the location of the truck crane should avoid the area above the underground garage slab and should not affect the main structure.

[0020] Since the truss is quite long, the position of the center of gravity should be calculated before lifting. The binding point of the hoisting wire rope should be the intersection of the web members on both sides of the center of gravity and the upper chord. The two-point binding method at the top should be used for lifting, and the lifting point should be selected at the support of the truss.

[0021] During hoisting, steel pipe segments should be placed at the corners where the wire rope contacts the upper chord of the steel truss. Before positioning the steel truss, ensure that the lowest point of the steel truss is approximately 1 meter above the corbel. When the crane's main boom rotates to the hoisting position, tilt the main boom downwards and slide the hook downwards. Once the height of the truss support end is roughly the same as the hoisting height, use a 5-ton hoist to pull it to the rubber support. After positioning, secure the truss. Hoist the remaining trusses in sequence using this method. Considering that the first steel truss, being a single truss, does not form a complete frame after hoisting and placement, and may become unstable and overturn due to external forces after the crane hook is released, a steel wire rope (Φ26mm steel wire rope, equipped with four 5t hand-operated hoists) should be installed before releasing the hook after the first truss is in place. (Note: The hook should be lowered slowly and evenly by 200mm to observe whether the truss is securely secured; only after confirming that everything is in order can the hook be released.) The steel wire rope can only be removed after all horizontal supports and vertical braces on each floor have been installed to form a complete frame. Special attention should be paid to ensuring the stability of the mid-span and end secondary beams after the single truss is installed.

[0022] The beneficial effects of this invention are as follows: High safety: Segmented prefabrication reduces the risk of single lifting weight and transportation; scientific selection of lifting points and corner protection ensures lifting safety; temporary fixing with wire ropes effectively prevents single trusses from becoming unstable and overturning at high altitudes, systematically reducing the risk of high-altitude operations.

[0023] Precision controllable: During the on-site assembly stage, the arching and dimensions can be precisely controlled on the ground; during the hoisting and positioning stage, a hand-operated hoist can be used for fine-tuning; and the butt welding is carried out in a stable temporary fixed state, thus ensuring the final installation accuracy and structural form.

[0024] Economical and efficient: It avoids the need to erect large-scale, full-span scaffolding, resulting in lower costs; the segmentation process reduces the requirements for lifting equipment, allowing for more flexible equipment selection; and the close integration of ground assembly with high-altitude hoisting and fixing processes improves construction efficiency.

[0025] High applicability: This method is particularly suitable for steel structure corridor projects with limited space, large span, and high installation position, providing a standardized and operable process route for solving such engineering problems. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main truss connecting steel wire rope of the present invention.

[0027] Figure 2 This is a schematic diagram of the main truss and lifting points of the present invention.

[0028] Figure 3 This is a schematic diagram of the temporary fixed state of the truss after it is in place in the installation method of the present invention.

[0029] Explanation of the labels in the diagram: 1-Main truss, 4-Minor truss 2-Support, 7-Corner, 3-Steel wire rope, 4-Small truss, 5-Steel pipe segment (corner protection component), 6-Suspension point (intersection of web member and top chord), 7-Corner, 8-Structural column, 9-Floor slab. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1 to 3 As shown, the present invention provides a method for installing a high-altitude, large-span steel structure connecting corridor. The specific implementation process is as follows:

[0032] According to the design drawings and transportation conditions, the entire large-span main truss 1 is disassembled into several smaller trusses 4 in the factory for processing. Each side of the main truss 1 is divided into at least two trusses. After all the smaller trusses 4 pass inspection, they are transported to the construction site. On the pre-designated level ground at the construction site, the smaller trusses 4 are assembled into the complete main truss 1. During assembly, a level is used to ensure that the working surface is level, a welding gap of about 10mm is reserved at the joint, and the camber is strictly controlled to be slightly higher than the design elevation (positive camber) to compensate for subsequent self-weight deflection. The camber is controlled within 1 / 5000 of the span L (for example, for a 60-meter span, the camber is controlled within 12mm).

[0033] Perform a center of gravity calculation on the assembled main truss 1. For example... Figure 1 As shown, the intersection point 6 between the nearest web member and the top chord on both sides of the center of gravity is selected as the lifting point. A two-point binding method is used, with one end of the wire rope 4 fixed to the lifting point 6 via a shackle or lifting lug. At the corner where the wire rope 4 contacts the top chord of the truss, a pre-cut arc-shaped steel pipe piece 5 is inserted and secured with wire to form a corner protection.

[0034] Based on the weight, lifting height, and working radius of the main truss 1, a truck crane of appropriate tonnage is selected. During lifting, the main truss 1 is lifted slowly and at a constant speed to ensure its stable posture. During the lifting process, the lowest point of the main truss 1 is always kept about 1 meter higher than the corbel 7 of the target support 2. When the crane boom rotates above the installation position, the support end of the main truss 1 is brought close to the installation height through luffing and hook lowering operations. Then, the construction personnel use a pre-prepared hand chain hoist (6) to slowly and accurately pull the support end of the main truss (1) onto the support (2) to complete the placement. In this embodiment, the support (2) is specifically a rubber support, which is set on the concrete corbel (7) to bear the truss load and provide the necessary buffer and deformation adaptability.

[0035] like Figure 2As shown, for the first main truss (1) in place (and each subsequent truss before forming the whole), temporary anti-overturning fixation must be carried out immediately. The specific method is to symmetrically install at least four steel wire ropes (3) at key locations such as the mid-span and both ends of its upper chord. The steel wire ropes (3) are usually made of steel wire rope. One end of the steel wire rope (3) is fixed to the pre-set lifting lug or reliable component on the main truss (1) by shackles or rope clips, and the other end must be anchored to the reliable main structure that has been completed and is adjacent to the connecting corridor, such as the reinforced concrete structural columns (8), shear walls or floor slabs (9) edges of the towers on both sides. The steel wire ropes (3) are tensioned and adjusted by matching hand chain hoists (6). By adjusting each hand chain hoist (6) synchronously, all steel wire ropes (3) are subjected to uniform force, ensuring that the main truss (1) maintains a stable posture in the two-dimensional plane and even in the three-dimensional space. Only after the above-mentioned setup, tensioning, and inspection are completed and verified to be correct can the lifting equipment be slowly released and completely unhooked. This step is a core safety measure to prevent a single truss from overturning laterally under wind load or accidental collision.

[0036] After two adjacent main trusses 1 are hoisted into place and temporarily secured, immediately install the horizontal supports (such as PC*) and vertical bracing (such as SC) between them. Following a bottom-to-top, middle-to-end sequence, install and weld all the required horizontal and vertical connecting components to connect the main trusses 1 into a stable spatial frame. At this point, the structure possesses its own stability, and all temporary wire ropes 3 and hand-operated hoists 6 can be safely removed.

[0037] On the stable main frame, continue to install the secondary beams, floor decking, stairs and other loose structural components of the connecting corridor to complete the main structure construction of the entire connecting corridor.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for installing a high-altitude, long-span steel structure connecting corridor, characterized in that, Includes the following steps: S1. Segmented prefabrication steps: Each side of the main truss (1) of the connecting corridor is processed into at least two small trusses (4), which are transported to the site and assembled to form the main truss (1) to be hoisted. S2, Lifting point calculation and selection steps: Calculate the center of gravity of the main truss (1) and select the connection point (6) between the web members and the upper chord on both sides of the center of gravity as the lifting point; S3. Lifting and positioning steps: Use lifting equipment to lift the main truss (1) through the lifting point and position it on the high-altitude support (2); S4. Temporary stabilization step: After the first main truss (1) is in place, a steel wire rope (3) is pulled on it and the steel wire rope (3) is adjusted to stabilize it, the lifting equipment can be unhooked. S5. Overall stabilization step: After installing connecting components between adjacent main trusses (1) to form a stable overall structure, remove the wire rope (3).

2. The installation method according to claim 1, characterized in that, In step S3, a steel pipe sheet (5) is placed at the corner contact position between the wire rope (4) at the lifting point and the main truss (1) as a corner protection component.

3. The installation method according to claim 1, characterized in that, The S3 step specifically includes: controlling the lowest point of the main truss (1) to always be higher than the set height of the bracket (7) of the support (2) during the hoisting process; after the support end height of the main truss (1) is basically consistent with the installation height, using a hand-operated hoist to pull it precisely onto the support (2).

4. The installation method according to claim 1, characterized in that, In step S4, there are at least four steel wire ropes (3), which are matched with the hand-operated hoist for adjusting their tension.

5. The installation method according to claim 1, characterized in that, In step S5, the connecting component includes horizontal support and vertical diagonal brace. After the connecting component is installed, the main truss (1) forms a stable spatial frame structure.

6. The installation method according to claim 1, characterized in that, In step S1, when assembling the small truss (4) on site, a weld gap is reserved at the joint, and the amount of camber during assembly is controlled.

7. The installation method according to claim 6, characterized in that, The camber of the assembly is a positive camber, and the control value is within 1 / 5000 of the beam span.

8. The installation method according to claim 1, characterized in that, After step S5, step S6, component installation step, is also included: on the main truss (1) that forms a stable whole, the remaining component structures of the connecting corridor are installed.

9. The installation method according to claim 1 or 4, characterized in that, The end of the steel wire rope (3) away from the main truss (1) is anchored to the existing main structure adjacent to the connecting corridor.

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