Combined installation method for special-shaped ultrahigh curtain wall steel column and large cantilever component

Abstract

The invention relates to a combined mounting method for a special-shaped ultrahigh curtain wall steel column and a large cantilever component, which comprises the following steps of: firstly, selecting, processing and manufacturing a support jig frame according to design parameters and field engineering conditions of a large cantilever truss; secondly, before the main body structure is installed to the position of the lower-layer large cantilever truss, a supporting jig frame is installed, and the perpendicularity and the elevation of the supporting jig frame are adjusted; assembling a lower-layer large cantilever truss on the ground and integrally hoisting the lower-layer large cantilever truss; after the installation of the lower-layer large cantilever truss is completed, the installation of the upper main body structure is continued, and the upper-layer large cantilever truss is constructed synchronously; then, the curtain wall steel column and the supporting jig frame are rigidly connected through the H-shaped steel vertical supports and the H-shaped steel horizontal supports, and a stable structure is formed; and after the main body structure is capped and all welding seams are qualified through flaw detection, the temporary supports and the supporting jig frame units are sequentially dismantled. The curtain wall steel column and the supporting system are rigidly connected through the H-shaped steel, and an efficient space stress structure is formed. By means of the structure, the overall stability is improved, and the accuracy and safety of the curtain wall steel column in the installation process are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure construction, in particular to a method for combining and installing special-shaped ultra-high curtain wall steel columns and large cantilever components. Background Art

[0002] With the rapid development of modern construction technology, landmark buildings such as convention and exhibition centers are constantly emerging. These buildings generally adopt steel structural systems to meet the functional requirements of large spaces. Long-span cantilevered steel structures and glass curtain walls have become common design choices, but the construction of such structures also presents some problems.

[0003] Curtain wall steel columns, crucial components supporting the glass curtain wall, typically utilize small-section box-shaped members, reaching heights of up to 34 meters and possessing a high slenderness ratio. While this design meets both the building's aesthetic and functional requirements, the excessive slenderness ratio during construction can easily lead to significant deformation of the steel columns during hoisting. This deformation not only compromises structural safety but can also compromise installation accuracy, ultimately impacting the overall building quality.

[0004] Traditional construction methods, such as hoisting the entire structure, can reduce on-site assembly workload. However, due to the excessive slenderness ratio of the steel columns, the columns are prone to significant deformation during the hoisting process, resulting in problems with structural safety and installation accuracy. While segmented hoisting can avoid the deformation associated with hoisting, the lower and upper ends of the steel columns are connected by pins, requiring the installation of the lower section of the steel column to be secured with a large number of temporary support brackets, which can only be removed after the upper section is installed. This method not only increases construction complexity and cost, but can also lead to low construction efficiency.

[0005] Furthermore, the installation of the long-span cantilever trusses within the main structure also required the installation of temporary support scaffolds. These scaffolds not only increased the number of construction measures used but also the installation and disassembly workload, reducing construction efficiency and increasing construction costs. Traditional construction methods not only suffer from low efficiency but also pose safety risks. The use of temporary scaffolds increases potential risks during construction and may reduce the overall stability of the structure during the installation phase. Furthermore, the use of a large number of temporary scaffolds increases construction costs, impacting the project's economic benefits. Summary of the Invention

[0006] The present invention aims to overcome the defects of the prior art and provide a combined installation method for special-shaped ultra-high curtain wall steel columns and large cantilever components, so as to solve the problems that ultra-long curtain wall steel columns with large slenderness ratios are prone to deformation when installing, the segmented lifting method requires a large number of temporary supports, and the cantilever truss installation requires the setting of temporary support cradles.

[0007] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: A method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components, characterized by comprising the following steps: Construction preparation: Select and manufacture the supporting frame based on the design parameters of the large cantilever truss and on-site engineering conditions; Installation of support frame: Before the main structure is installed to the position of the lower large cantilever truss, install the support frame and adjust its verticality and elevation; Installation of the lower-level large cantilever truss: Assemble the lower-level large cantilever truss on the ground and hoist it as a whole; Progressive construction of the upper structure: After the installation of the lower large cantilever truss is completed, the installation of the upper main structure will continue, and the upper large cantilever truss will be constructed simultaneously; Curtain wall steel column installation: The curtain wall steel column and the supporting frame are rigidly connected through H-shaped steel vertical supports and horizontal supports to form a stable structure; Removal of temporary supports: After the main structure is capped and all welds are inspected and qualified, the temporary supports and support frame units are removed in turn.

[0008] The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components is characterized in that the construction preparation further includes: Determine the plane positioning coordinates and vertical elevation parameters of the support frame through structural mechanics calculation software; Determine the cross-sectional parameters of the H-shaped steel vertical and horizontal supports to ensure that they meet the design requirements of the node shear bearing capacity and bending stiffness.

[0009] The method for combining and installing special-shaped ultra-high curtain wall steel columns and large cantilever components is characterized in that the support frame installation further comprises: Use a high-precision total station to place embedded parts of the support frame foundation and the bottom embedded parts of the curtain wall steel columns on site; Adjust the verticality and elevation of the supporting cradle to ensure that it has sufficient strength, rigidity and stability to bear the weight of large cantilever components and curtain wall steel columns and construction loads.

[0010] The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components is characterized in that the curtain wall steel column installation includes: The lower curtain wall steel column and the curtain wall steel column sleeve are pre-assembled using the pin connection process. After hoisting to the designed position, precise adjustment is performed using theodolite and level. Use vertical supports to connect the lower end of the steel column of the lower curtain wall to the embedded concrete parts, and use horizontal supports to connect the upper end of the steel column of the lower curtain wall to the nearby large cantilever truss support frame to form a stable structure; The upper curtain wall steel column and the sleeve are pre-pinned on the ground. After being hoisted into place, they are temporarily fixed to the lower curtain wall steel column through docking plates and temporarily tied to the upper large cantilever truss.

[0011] The method for combining and installing special-shaped ultra-high curtain wall steel columns and large cantilever components is characterized in that the temporary support removal includes: first removing the horizontal support, then removing the vertical support, and finally disassembling and lifting the support frame unit.

[0012] The method for combining and installing special-shaped ultra-high curtain wall steel columns and large cantilever components is characterized in that the construction preparation also includes using BIM three-dimensional positioning technology to determine the spatial coordinates of the support frame foundation embedded parts and the curtain wall steel column bottom embedded parts to ensure their installation accuracy.

[0013] The beneficial effects of the present invention are as follows: It can be seen from the above technical solution that this application provides a combined installation method for special-shaped ultra-high curtain wall steel columns and large cantilever components, using H-shaped steel vertical and horizontal supports to construct a rigid connection system, achieving a stable connection between the lower curtain wall steel columns and the support frame, and forming an efficient spatial force-bearing structure. This technology significantly reduces the investment and installation costs of the component parts, effectively suppresses the slenderness ratio effect during the steel column hoisting process through rigid connection, and controls the deformation within the safety threshold; at the same time, it eliminates the potential risks of the temporary support system and greatly improves the overall stability safety factor of the structure during the installation stage; the amount of material used for the measure is significantly reduced, saving construction costs and effectively ensuring the economic benefits of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of this application. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions of the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection requested by this application. like Figure 1 Shown: A combined installation method of special-shaped super-high curtain wall steel columns and large cantilever components, the specific implementation includes the following process: Step 1: Construction preparation. In the early stage of construction plan deepening, based on the design parameters of the large cantilever truss and on-site engineering conditions, the support cradle 4 is selected through structural mechanics calculation software, the plane positioning coordinates and vertical elevation parameters are determined, and the support cradle is processed and manufactured. The support cradle 4 must have sufficient strength, rigidity and stability to withstand the weight and construction loads of the large cantilever components 2, 3 and the curtain wall steel columns 8, 9. In view of the connection structure between the curtain wall steel columns 8, 9 and the support cradle 4, the cross-sectional parameters of the H-shaped steel vertical support 6 and the horizontal support 7 are determined through node force analysis. The flange width, web thickness and cross-sectional height must meet the node shear bearing capacity and bending stiffness design requirements to ensure the formation of a reliable load transfer system.

[0016] Step 2: Installation of embedded concrete parts 5. During the basement slab reinforcement binding phase, BIM 3D positioning technology was used to determine the spatial coordinates of the support frame foundation embedded parts and the curtain wall steel column bottom embedded parts, and a high-precision total station was used for on-site placement.

[0017] Step 3: Install the upper main structure 1 layer by layer.

[0018] Step 4: Install the support cradle 4. Before the main structure 1 is installed to the lower cantilever truss 2, begin installing the support cradle 4. Use a truck crane to hoist the cradle unit, adjusting the verticality and elevation of the support cradle 4 to meet design requirements. After installation, conduct a comprehensive inspection and acceptance check to ensure its stability and safety.

[0019] Step 5: Install the lower cantilever truss 2. Set up a steel assembly cradle at the ground assembly site, assemble the lower cantilever truss 2 on the ground, hoist it as a whole, and then install other auxiliary components, ensuring that the connections between the components are firm and the welds and bolts at the nodes meet the requirements.

[0020] Step 6: Progressive construction of the superstructure. After the lower-level large cantilever truss 2 is installed and a stable system is formed, the upper main structure 1 is installed, and the upper-level large cantilever truss 3 is constructed simultaneously, forming a construction process in which the support frame is installed in a progressive manner with the height of the structure, and the cantilever components are installed symmetrically in layers.

[0021] Step 7: Install the lower curtain wall steel column 8. Pre-assemble the lower curtain wall steel column 8 and the curtain wall steel column sleeve 10 using the pin connection process. Use a hoisting machine to hoist the lower curtain wall steel column 8 to the designed position. After hoisting into place, keep the crane hook in the state. Use theodolite and level to accurately adjust the verticality, elevation and position of the lower curtain wall steel column 8 to ensure that it meets the design requirements.

[0022] Step 8: Temporarily secure the lower curtain wall steel column 8. Use vertical supports 6 to connect the lower end of the lower curtain wall steel column 8 to the pre-buried concrete inserts 5. Use horizontal supports 7 to connect the upper end of the lower curtain wall steel column 8 to the nearby large cantilever truss support frame 4. Both connections are made with full penetration welding to form a stable structure. After the temporary supports are installed, perform a secondary measurement and calibration, complete the circumferential weld between the lower curtain wall steel column sleeve 10 and the inserts 5, and remove the lifting rigging.

[0023] Step 9: Install the upper curtain wall steel column 9. Pre-pin the upper curtain wall steel column 9 to the casing 10 on the ground. After hoisting into place, temporarily secure the lower end of the upper curtain wall steel column 9 to the lower curtain wall steel column 8 with eight butt-jointing plates. The upper end of the upper curtain wall steel column 9 is temporarily tied to the upper cantilever truss 3 with a steel slat. After alignment, perform the corresponding welds.

[0024] Step 10: Temporary support removal. After the main structure 1 is capped and all welds have passed flaw detection, temporary support removal begins. First, horizontal support 7 is removed, followed by vertical support 6, and finally, the support frame 4 units are disassembled and hoisted.

[0025] For double-layer large cantilever trusses at the same horizontal projection line position, the present invention sets a non-standard support cradle at the position of the lower large cantilever truss 2, so as to achieve the effect of using a single set of support cradles 4 for the installation of two layers of trusses at the same time. This optimizes the traditional construction process of setting up double sets of support cradles on both sides of the truss support point to avoid the deficiency of the first-layer truss, and can reduce the number of support cradle measures by several times.

[0026] This invention fully utilizes the support cradle of the large cantilevered member, employing H-shaped steel vertical supports 6 and horizontal supports 7 to rigidly connect the lower curtain wall steel columns 8 to the support cradle system, forming a stable spatial load-bearing structure. This eliminates the need for temporary support cradles during the installation of the lower curtain wall steel columns, significantly reducing the use of construction measures and the workload of installing and removing them, effectively improving construction efficiency.

[0027] This invention effectively controls deformation. By employing a rigid connection method, the slenderness effect during steel column installation is effectively suppressed, keeping deformation within a safe threshold. This ensures installation accuracy, avoids structural safety issues caused by excessive deformation, and improves the structural safety and stability coefficient. By forming a stable spatial force-bearing structure, the potential risks of the temporary support system are eliminated, and the overall stability and safety coefficient of the structure during installation is significantly improved, providing a strong guarantee for safety during construction.

[0028] This invention significantly reduces construction costs. Conventional construction methods require numerous temporary support frames, but this solution, through innovative connection methods, completely eliminates these temporary support structures. This not only reduces the use of temporary support systems but also reduces the use of construction measures and the workload of installing and removing them, thus saving significant construction costs.

[0029] The above are only embodiments provided for this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A combined installation method of special-shaped super-high curtain wall steel columns and large cantilever components, characterized in that: The following steps are involved: Construction preparation: Select and manufacture the supporting frame based on the design parameters of the large cantilever truss and on-site engineering conditions; Installation of support frame: Before the main structure is installed to the position of the lower large cantilever truss, install the support frame and adjust its verticality and elevation; Installation of the lower-level large cantilever truss: Assemble the lower-level large cantilever truss on the ground and hoist it as a whole; Progressive construction of the upper structure: After the installation of the lower large cantilever truss is completed, the installation of the upper main structure will continue, and the upper large cantilever truss will be constructed simultaneously; Curtain wall steel column installation: The curtain wall steel column and the supporting frame are rigidly connected through H-shaped steel vertical supports and horizontal supports to form a stable structure; Removal of temporary supports: After the main structure is capped and all welds are inspected and qualified, the temporary supports and support frame units are removed in turn.

2. The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components according to claim 1 is characterized in that: The construction preparation also includes: Determine the plane positioning coordinates and vertical elevation parameters of the support frame through structural mechanics calculation software; Determine the cross-sectional parameters of the H-shaped steel vertical and horizontal supports to ensure that they meet the design requirements of the node shear bearing capacity and bending stiffness.

3. The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components according to claim 1, characterized in that: The support tire frame installation also includes: Use a high-precision total station to place embedded parts of the support frame foundation and the bottom embedded parts of the curtain wall steel columns on site; Adjust the verticality and elevation of the supporting cradle to ensure that it has sufficient strength, rigidity and stability to bear the weight of large cantilever components and curtain wall steel columns and construction loads.

4. The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components according to claim 1, characterized in that: The curtain wall steel column installation includes: The lower curtain wall steel column and the curtain wall steel column sleeve are pre-assembled using the pin connection process. After hoisting to the designed position, precise adjustment is performed using theodolite and level. Use vertical supports to connect the lower end of the steel column of the lower curtain wall to the embedded concrete parts, and use horizontal supports to connect the upper end of the steel column of the lower curtain wall to the nearby large cantilever truss support frame to form a stable structure; The upper curtain wall steel column and the sleeve are pre-pinned on the ground. After being hoisted into place, they are temporarily fixed to the lower curtain wall steel column through docking plates and temporarily tied to the upper large cantilever truss.

5. The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components according to claim 1, characterized in that: The temporary support removal includes: first removing the horizontal support, then removing the vertical support, and finally disassembling and hoisting the support frame unit.

6. The method for combining and installing special-shaped super-high curtain wall steel columns and large cantilever components according to claim 1, characterized in that: The construction preparation also includes using BIM three-dimensional positioning technology to determine the spatial coordinates of the support frame foundation embedded parts and the curtain wall steel column bottom embedded parts to ensure their installation accuracy.

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