Construction method of large-span rigid steel truss structure

Abstract

The present invention discloses a construction method for a large-span rigid steel truss structure, comprising the following steps: in-depth design of the rigid steel structure; processing of the rigid steel structure; pre-assembly of the rigid steel structure; installation of rigid steel columns; installation of a reinforced concrete floor support system; installation of lattice column supports; positioning, hoisting and welding of trusses; removal of lattice column supports and erection of rigid steel beam formwork supports; sealing of the rigid steel beam formwork and pouring of concrete; and removal of the formwork. The present invention aims at rigid steel trusses with large structures and heavy masses, and uses a "truss segment processing + temporary support + segment hoisting" method to replace the traditional high-altitude scattered parts installation method. Through rational segmentation and pre-assembly, and in conjunction with the use of a lattice column support system, effective installation of components is achieved, thereby solving the difficult problem of high installation precision requirements such as truss arch control in the construction of large-span rigid steel truss structures, and achieving excellent results, truly achieving the purpose of smooth structure and simple construction, and having high promotion value.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a construction method of a large-span rigid steel truss structure. Background Art

[0002] Large-span buildings are buildings with roof spaces spanning more than 30m. In some buildings, due to functional requirements, the space must be large and no columns are allowed in the middle, such as gymnasiums, theaters, exhibition halls, conference halls, airport, bus and ship waiting halls and other public buildings and industrial buildings, factories, hangars and other large warehouses. The roof structures of large-span buildings mainly include: portal frames, thin-web beams, folded plates, trusses, arches, shells, grids, cables and membrane structures. In recent years, with the development of urban construction and the advancement of construction technology, large-span structures have been used more and more, and steel trusses, as the main load-bearing components particularly suitable for large-span structures, have also been widely used.

[0003] During the construction of existing commercial complex buildings, due to the limitations of the construction site, when the structural form is a large-span, large-structure, and large-mass steel truss, the traditional high-altitude loose assembly method is only applicable to bolt-ball node type grids, and a cantilever construction method with fewer supports should be adopted. If the traditional high-altitude loose parts installation method is adopted, the installation of the truss is difficult and the installation efficiency is extremely low. Therefore, a construction method for a large-span rigid steel truss structure with large structure and large mass is needed. Summary of the Invention

[0004] In order to overcome the defects of the existing technology center, the present invention provides a large-span rigid steel truss structure construction method. By adopting the "truss segment processing + temporary support + segment lifting" method to replace the traditional high-altitude loose parts installation method, the difficulties in the construction of large-span rigid steel truss structures are solved, and excellent results are achieved, truly realizing the purpose of smooth structure and simple construction.

[0005] In order to achieve the above object, the present invention provides a method for constructing a large-span rigid steel truss structure, comprising the following steps:

[0006] Construct a 3D model of the long-span rigid steel truss according to the construction drawings of the long-span rigid steel truss structure, and divide the long-span rigid steel truss into a middle section and two side sections;

[0007] Export the processing drawings of the large-span rigid steel truss structure and process and manufacture the corresponding segmented internal components in the processing plant;

[0008] The pre-assembled large-span rigid steel truss components are assembled in sections through the pre-assembled frame;

[0009] After the civil engineering department pours the basement roof and concrete beams, the upper steel columns of the basement roof are installed, and the top concrete floor support system is installed;

[0010] By utilizing the lower scaffolding of the top concrete slab support system, lattice column supports are installed directly below the long-span rigid steel truss beams;

[0011] The long-span rigid steel truss members are hoisted in sections in the order of first the side sections and then the middle section;

[0012] After all components are hoisted, the lattice column supports are removed, and the steel beam formwork is set up to support the formwork. After the formwork is installed, the steel structure concrete is poured;

[0013] After the pouring of the strong steel structure concrete is completed, the strong steel beam formwork supporting formwork is removed.

[0014] Preferably, the column tops of the lattice column supports along the height direction are used for placing the segmented trusses by means of column top fixtures.

[0015] Preferably, the lattice column support is provided with oblique support rods on both sides perpendicular to the height direction of the lattice column support.

[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0017] 1) The second-floor trusses use large-span H-shaped steel trusses. Secondary beams are set between the main trusses, and the main trusses are connected to the steel columns on both sides. Due to the large size of the components and considering the on-site construction period and construction conditions, it is necessary to adopt the method of factory prefabrication and segmented lifting for installation. Through rational segmentation and pre-assembly, the difficult problems of high installation precision requirements such as truss arch control are solved.

[0018] 2) The problem that large-span components cannot be installed in one go during the construction process can be solved by setting up a support system to assist in the high-altitude assembly of large-span components. After the structure is in place and fixed, it can be dismantled. The lattice column support system not only realizes the installation and positioning of large-span and heavy-weight components, but also realizes support assembly, which is convenient, fast and reusable.

[0019] 3) The overall three-dimensional coordinates of the segmented component nodes are obtained through Tekla software, and the installation and positioning of the truss are realized by using a total station. The pre-arch value is used to ensure that the positioning of the truss meets the arch requirements. The segmented trusses on both sides of the truss are installed first, and the middle segmented truss is installed after the positioning is completed. During construction, the loads of different components and different nodes vary greatly, so temporary steel supports need to be designed to assist in the installation. A reasonable installation sequence can ensure the reasonable force of the component installation, which not only ensures safety but also greatly guarantees accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a construction process flow chart of the large-span rigid steel truss structure construction method of the present invention.

[0022] Figure 2 It is a schematic diagram of sections of a truss beam in the construction method of a large-span rigid steel truss structure of the present invention.

[0023] Figure 3 It is an installation schematic diagram when installing upper steel columns in the large-span rigid steel truss structure construction method of the present invention.

[0024] Figure 4 This is a demonstration diagram of the use of BIM lattice support in the large-span rigid steel truss structure construction method of the present invention.

[0025] Figure 5 It is a schematic diagram of the construction of a standard lattice column in the large-span rigid steel truss structure construction method of the present invention.

[0026] Figure 6 It is a schematic diagram of the hoisting of the trusses at both ends in the construction method of the large-span rigid steel truss structure of the present invention.

[0027] Figure 7 It is a schematic diagram of the hoisting of the middle section truss in the large-span rigid steel truss structure construction method of the present invention.

[0028] Figure 8 It is a schematic diagram of the dismantling of lattice columns in the large-span rigid steel truss structure construction method of the present invention.

[0029] Figure 9 It is a schematic diagram of the completion of the rigid steel structure in the large-span rigid steel truss structure construction method of the present invention.

[0030] The corresponding relationship of the reference numbers in the accompanying drawings is as follows:

[0031] 1-Long-span rigid steel truss; 2-Strong steel column; 21-Steel column corbel; 3-Segment one; 4-Segment two; 5-Segment three; 6-Lattice column support; 60-Standard lattice column; 61-Upper base; 62-Lower base; 63-Circular tube support; 64-Lattice column inner rod; 7-Basement roof; 8-Column top tooling; 9-Steel column top corbel; 10-Strong steel beam. DETAILED DESCRIPTION

[0032] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0033] The technical problem to be solved by the present invention is that the traditional method of installing scattered parts of steel trusses at high altitude is only applicable to the grid of bolt ball node type, and it is advisable to adopt a cantilever construction method with few supports. For large-span rigid steel trusses with large structure and heavy mass, the installation difficulty angle cannot meet the installation requirements. A large-span rigid steel truss structure construction method is provided. Through rational segmentation and pre-assembly, the difficulties in the construction of large-span rigid steel truss structures are solved, the installation and positioning of large-span and heavy-weight components are realized, and the support assembly is realized, which is convenient, fast and reusable, and greatly improves the construction efficiency.

[0034] See also Figures 1 to 9 As shown, the present invention provides a method for constructing a large-span rigid steel truss structure, comprising the following steps:

[0035] 1) Deepening design of steel structure:

[0036] According to the construction drawings of the long-span rigid steel truss 1 structure, a three-dimensional model of the long-span rigid steel truss 1 is constructed, and the long-span rigid steel truss 1 is divided into three sections: the middle and both sides, including section 1 3, section 2 4, and section 3 5. It should be noted that the key points in the detailed design include:

[0037] a. Use Tekla software to build a 3D model of the long-span rigid steel truss 1 steel structure, perform collision checks with the concrete structure, and optimize collision points;

[0038] b. Calculate the structural strength, stiffness, and stability of the structure. The loads include the deadweight of the steel beams, the deadweight of the concrete structure, the deadweight of the formwork and support system, and live loads during construction. Based on the calculation results, reinforce the corresponding sections, draw steel structure fabrication drawings, and determine the installation process.

[0039] c. The optimal three-dimensional coordinates of the segmented component nodes are obtained based on the three-dimensional simulation. The overall three-dimensional coordinates are converted into local three-dimensional coordinates for each segment during assembly. These serve as the basis for node positioning and linear control during segment assembly, thereby accurately controlling the linear shape of the truss structure.

[0040] 2) Strong steel structure processing:

[0041] The processing drawings of the large-span rigid steel truss 1 structure are exported, and the corresponding internal components of segment 1 3, segment 2 4 and segment 3 5 are processed and manufactured in the processing plant. It should be noted that the production process of rigid steel structure components follows the order of "layout, cutting, correction and forming, edge processing, hole making, end processing, assembly of steel frame components, and pre-assembly", and the specific processing and production is entrusted to professional manufacturers.

[0042] 3) Pre-assembly of strong steel structure:

[0043] The components of the large-span rigid steel truss 1 that have been processed and manufactured are assembled in sections through a pre-assembly frame. During the specific assembly, the first pre-assembly segment is placed on the pre-assembly frame. When placing, the position of the first segment is roughly determined and the flatness of the first segment is tested based on the entire pre-assembly length and the pre-arch value. All the rods of the second and third segments are placed in sequence, and corresponding tests, adjustments and temporary fixations are carried out.

[0044] Preferably, during assembly, the geometric accuracy and matching accuracy of a trial assembled segment need to be fully tested. If any deviation occurs, corresponding adjustments need to be made. The accuracy requirements of the arch of the entire pre-assembled length are tested through the characteristic points on the side panel surface. In addition, in order to facilitate the positioning and connection of the truss, positioning installation lines are marked on each longitudinal interface of the segment and two sets of temporary matching connectors are installed. At the same time, all rods are numbered for easy installation in sections. At the same time, the segmented trusses are disassembled and rust-proofed and painted. Before the pre-assembly inspection of the segment, the constraints of the frame on the segment are released to make the segment free. The arch, distortion, port size and matching between segments are checked in particular.

[0045] 4) Installation of steel columns:

[0046] The civil engineering department will pour the basement roof and concrete beams, with priority given to installing the upper steel columns and completing the welding.

[0047] 5) Installation of reinforced concrete floor support system:

[0048] After calculation, the top concrete slab support system is selected and installed.

[0049] 6) Lattice column support installation:

[0050] By using the lower scaffolding of the concrete floor support system, the lattice column support 6 is installed. The support is set just below the truss beam. The segmented truss is placed in the form of lattice column + column top tooling 8. The positioning is fine-tuned according to the elevation of the truss and the pre-arch value. Diagonal support members are set on both sides of the lattice column support 6 to adjust and fix the truss beam. Figure 5As shown, the standard lattice column 60 includes an upper base 61 and a lower base 62 arranged in parallel, and a lattice column inner rod 64 vertically fixedly connected between the upper base 61 and the lower base 62. At the same time, a round tube support 63 is also fixedly connected between the lattice column inner rods 64. It should be noted that the lattice column supports 6 are connected to the flange plates of the standard lattice columns 60 by high-strength bolts, the standard lattice columns 60 are fastened together by M24*75mm, 8.8 grade large hexagonal high-strength bolts, and the lattice column inner rods 64 are fastened together by M20*60, 8.8 grade large hexagonal high-strength bolts.

[0051] 7) Truss segment positioning, hoisting and welding:

[0052] The large-span rigid steel truss 1 components are hoisted in sections in the order of the two side sections first and then the middle section. When hoisting and installing the truss sections at both ends, the bottom is connected and fixed to the lattice column support 6, the upper chord is connected to the top corbel 9 of the steel column, and the lower chord segment is connected to the steel column corbel 21 through a horse plate and welded through fillet welds. This part will be butt-welded to the main structure after the structure is completed. When installing the secondary web members between the trusses, they are all temporarily fixed. Pay attention to checking the pre-arch value of the truss during installation. When installing the middle section truss and its secondary members, check the installation deviation and perform overall welding after the requirements are verified.

[0053] 8) Remove the lattice column support and set up the steel beam formwork support:

[0054] After all the trusses are installed, the lattice column support 6 and the lower scaffolding are removed. The lower chord segment position is still not welded. The formwork support of the steel beam 10 needs to be selected and the formwork reinforcement method analyzed based on the load calculation.

[0055] 9) Close the steel beam formwork and pour concrete:

[0056] After the formwork is installed, pour the steel structure concrete. During the process, strictly control the concrete slump and vibration process to ensure that the concrete around the steel is dense and maintain the concrete according to the specifications.

[0057] 10) Template removal:

[0058] After reaching the design strength, the formwork is removed in the order of first removing the non-load-bearing formwork and then the load-bearing formwork, first removing the side formwork and finally removing the bottom formwork. After the structure settlement is stable, the lower chord is welded in sections.

[0059] The specific process principles of the large-span rigid steel truss structure construction method of the present invention include:

[0060] For rigid steel trusses with large structures and heavy mass, the method of "truss segment processing + temporary support + segment lifting" is used to replace the traditional high-altitude loose parts installation method. Through rational segmentation and pre-assembly, effective installation of components is achieved. The form and geometric dimensions of the trusses are studied in detail, and the node dimensions are determined so that the support system meets the requirements of safe construction. The load, stability and safety of the two-way orthogonal steel trusses are effectively controlled during construction by dividing them into several main and secondary trusses. This solves the difficulties in the construction of large-span rigid steel truss structures and achieves excellent results, truly achieving the goal of smooth structure and simple construction.

[0061] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A method for constructing a large-span rigid steel truss structure, characterized in that: The following steps are involved: Construct a 3D model of the long-span rigid steel truss according to the construction drawings of the long-span rigid steel truss structure, and divide the long-span rigid steel truss into a middle section and two side sections; Export the processing drawings of the large-span rigid steel truss structure and process and manufacture the corresponding segmented internal components in the processing plant; The pre-assembled large-span rigid steel truss components are assembled in sections through the pre-assembled frame; After the civil engineering department pours the basement roof and concrete beams, the upper steel columns of the basement roof are installed, and the top concrete floor support system is installed; By utilizing the lower scaffolding of the top concrete slab support system, lattice column supports are installed directly below the long-span rigid steel truss beams; The long-span rigid steel truss members are hoisted in sections in the order of first the side sections and then the middle section; After all components are hoisted, the lattice column supports are removed, and the steel beam formwork is set up to support the formwork. After the formwork is installed, the steel structure concrete is poured; After the pouring of the strong steel structure concrete is completed, the strong steel beam formwork supporting formwork is removed.

2. The method for constructing a large-span rigid steel truss structure according to claim 1, wherein: The top of the lattice column support in the height direction is provided with a segmented truss through a column top tooling.

3. The method for constructing a large-span rigid steel truss structure according to claim 1, wherein: The lattice column support is provided with oblique support rods on both sides perpendicular to the height direction of the lattice column support.

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