Installation and construction method for large-span cable-supported steel roof

Abstract

The invention discloses an installation and construction method for a large-span cable-supported steel roof. The installation and construction method comprises the following steps that (1) a central tension ring supporting frame pre-embedded steel plate is arranged during foundation construction; (2) a central tension ring supporting frame is fixed, and the height of the central tension ring supporting frame is obtained by subtracting the stretch-draw camber height from the design elevation of the corresponding part of the roof; (3) the roof is assembled through the central tension ring supporting frame and the top annular truss of the main body structure, tensioning tools of the radial inhaul cables are installed, and pre-tightening of all the radial inhaul cables is completed; (4) the radial inhaul cables are synchronously tensioned on the ground in a grading mode, the roof is arched upwards in the tensioning process, the middle is separated from the central tension ring supporting frame, and the periphery falls to the annular truss on the top of the main body structure; (5) the roof is connected with a hinged support on the top annular truss; and (6) the central tension ring supporting frame is dismantled, and roof installation is completed. The construction process is simplified, the construction efficiency is improved, the construction cost is saved, and the engineering safety quality is improved.

Description

Technical Field

[0001] The present invention relates to a method for installing a steel structure roof, in particular to a method for installing a large-span cable-supported steel roof. Background Art

[0002] The steel structure roof of a certain building is a large-span cable-supported steel roof, adopting a spoke-shaped beam string structure system with a span of 60m, a height of the steel roof of 23.8m, a fusiform cross-section that is narrow on both sides and wide in the middle, with a maximum width of 5.7m. Radially, it consists of 16 radial chord members and steel cables; circumferentially, it consists of 6 chord members, with a rigid ring in the middle, and it falls on the circumferential truss at the top of the main structure around, and is connected by finished hinge supports. The steel roof weighs 384 tons, the ring truss weighs 356.7 tons, and the entire roof system weighs 740.7 tons. Such a heavy roof system poses great challenges to the installation work.

[0003] Due to the large span, high installation height, and complex shape of the steel roof, if the traditional integral jacking method is used, there are great difficulties in the jacking process. The jacking support frame, that is, the ground welding platform, needs to be shaped according to the roof shape, and it is very difficult to ensure the construction quality of the steel roof. Moreover, during jacking, due to the complex shape of the steel roof and the inconsistent center of gravity of each segmented structure, a series of safety and quality accidents such as structural deformation are likely to occur, and the construction process is complex, the progress is slow, and the efficiency is extremely low. Summary of the Invention

[0004] The present invention provides a method for installing a large-span cable-supported steel roof to solve the technical problems existing in the known technology. This method can ensure construction quality, guarantee construction safety, and has low construction difficulty.

[0005] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a method for installing a large-span cable-supported steel roof, which adopts the following steps: 1) Set the embedded steel plate of the central tension ring support frame during foundation construction; 2) Fix the central tension ring support frame on the embedded steel plate of the central tension ring support frame, and the height of the central tension ring support frame is the design elevation of the corresponding part of the roof minus the jacking camber height; 3) Assemble the roof: 3.1) Hoist the central tension ring onto the central tension ring support frame; 3.2) Install the roof members relying on the central tension ring and the circumferential truss at the top of the main structure; 3.3) Install the tensioning tooling for the radial cables; 3.4) Complete the installation and pre-tightening of all radial cables; 4) Synchronously tension the radial cables in stages on the ground. During the tensioning process, the roof arches upward, the middle part is separated from the central tension ring support frame, and the periphery descends onto the circumferential truss at the top of the main structure; 5) Connect the roof to the hinge supports on the circumferential truss at the top; 6) Remove the central tension ring support frame to complete the installation of the roof.

[0006] In the step 2), the jacking camber height of the roof is 2 - 3 cm.

[0007] The central tension ring support frame is provided with 4 support columns, and adjacent support columns are connected by tie rods.

[0008] Each support column is provided with a base, a standard section and an adjustment section.

[0009] The standard section is formed by connecting two side components and an abdominal component. The two side components are formed by welding rods, and the abdominal component is connected to the two side components by flanges and bolts.

[0010] The base is made of double-spliced H-shaped steel.

[0011] When the span of the top circumferential truss is relatively large, temporary support columns are arranged below it.

[0012] The advantages and positive effects of the present invention are as follows: By setting up the temporary support structure and the tensioning system, the construction procedures are simplified, the construction efficiency is improved, the construction cost is saved, and the engineering safety and quality are improved. Engineering practice shows that the present invention can effectively solve the problem of difficult installation of large-span cable-supported steel roofs, greatly improve the construction efficiency, ensure the construction quality of the cable-supported steel roof, save the construction period at the same time, and reduce the construction difficulty. In addition, the temporary support structure and the tensioning system in the present invention are simple in structure and easy to manufacture. They can be made on-site using the materials on-site without special processing by a manufacturer. They can be made and used immediately, which can save costs. In addition, after the temporary support structure is used, it can be recycled and reused, and can also be disassembled and used for other engineering purposes, with good economy; The temporary support structure and the tensioning system adopt welding or bolt connection, have a long service life and do not require complex treatment of their materials, can save energy, reduce waste, and prevent environmental pollution. Compared with the traditional integral jacking method, the present invention has a lower cost, can save the construction period, greatly reduce the construction difficulty, ensure the construction quality, and is convenient for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the roof for applying the present invention;

[0014] Figure 2 For Figure 1 the top view;

[0015] Figure 3 For Figure 1 the front view;

[0016] Figure 4 A schematic plan view of the central tension ring support frame and the temporary support columns in the present invention;

[0017] Figure 5 A schematic plan view of the central tension ring support frame in the present invention for supporting the central tension ring;

[0018] Figure 6 is Figure 5 a sectional view of;

[0019] Figure 7 is a schematic diagram of the temporary support column in the present invention supporting the circumferential truss at the top of the main structure;

[0020] Figure 8 is the layout plan of the embedded steel plates of the central tension ring support frame in the present invention;

[0021] Figure 9 is Figure 8 sectional view 1-1 of;

[0022] Figure 10 is the schematic diagram of the standard section structure of the support column in the present invention;

[0023] Figure 11 is the layout plan of the radial cables in the roof covering applying the present invention;

[0024] Figure 12 is the schematic diagram of the base of the support column in the present invention;

[0025] Figure 13 is the schematic diagram of step 3.1) of the present invention;

[0026] Figure 14 is the schematic diagram of step 3.2.1) of the present invention;

[0027] Figure 15 is the schematic diagram of step 3.2.2) of the present invention;

[0028] Figure 16 is the schematic diagram of step 3.2.3) of the present invention;

[0029] Figure 17 and Figure 18 is the schematic diagram of step 3.2.4) of the present invention;

[0030] Figure 19 is the schematic diagram of step 4) of the present invention;

[0031] Figure 20 is the schematic diagram of step 6) of the present invention.

[0032] In the figure: 1. Support column; 2. Temporary support column; 3-1. Central tension ring; 3-2. Upper chord beam; 3-3. Brace; 3-4. Radial cable; 3-5. Tensioning tooling; 4. Truck crane; 5. Cable reel. Detailed implementation manners

[0033] In order to further understand the content, features and effects of the present invention, the following embodiments are given and described in detail in conjunction with the accompanying drawings as follows:

[0034] Please refer to Figures 1 to 20 , a construction method for installing a long-span cable-supported steel roof, which adopts the following steps:

[0035] 1) During the foundation construction, embed the steel plate for the central tension ring support frame.

[0036] In this embodiment, the size of the embedded steel plate is 400mm×400mm×16mm, the material is Q355B, and the embedded part anchor bars are plug welded with HRB400 steel bars with a diameter of D16 and a length of 300mm. For the layout of the embedded steel plate of the central tension ring support frame 1 and the embedded part node diagram, please refer to Figures 8 - 9 .

[0037] 2) Fix the central tension ring support frame on the embedded steel plate of the central tension ring support frame. The height of the central tension ring support frame is the design elevation of the corresponding part of the roof minus the jacking arch height.

[0038] In this embodiment, the central tension ring support frame is provided with 4 support columns 1, and adjacent two support columns 1 are connected by tie rods. The support column 1 is provided with a base, a standard section and an adjustment section.

[0039] In this embodiment, the plane size of the central tension ring support frame is 1.6mX1.6m, the panel height is 2.8m, the upright bar specification of the support column 1 is: B135X10, the web bar specification is B70X6, and the materials are all Q235B. The support column 1 is composed of an upright bar and a web bar. The upright bar is made of square tube, the web bar is made of square tube, and the material is Q235B. The standard section of the support column 1 is composed of three components A, B, and C. Please refer to Figure 10 , component A and C are the two side components, component B is the abdominal component. The two side components are welded by rods, and the abdominal component is connected to the two side components by flanges + bolts. Such a design can be flexibly combined and extended according to needs during construction, facilitating installation and removal, and shortening the construction period.

[0040] The size of the base platform is 2000*2000mm, and it is made of double HM250X250X9X14 H-shaped steels, and the materials are all Q235B. Please refer to Figure 12 .

[0041] When installing the central tension ring support frame, first install the support column 1. When installing the support column 1, first fix the base, then hoist the first standard section at the bottom, and after positioning, weld it to the base. Hoist the second standard section, align it with the first standard section, and then fix it with connecting bolts. Repeat the above steps until the installation of the uppermost standard section is completed. Install the adjustment section at the upper part of the support frame, align it with the lower standard section, and then fix it with connecting bolts.

[0042] 3) Assemble the roof

[0043] 3.1) Hoist the central tension ring 3-1 onto the central tension ring support frame. Please refer to Figure 13 .

[0044] 3.2) Install the roof members relying on the central tension ring and the top circumferential truss of the main structure

[0045] Specifically:

[0046] 3.2.1) Install the roof members, including the upper chord beam 3-2, the strut 3-3, and the circumferential beam, etc. Please refer to Figure 14 ;

[0047] 3.2.2) Unroll the cable using the cable unrolling reel 5 and the truck crane 4. Please refer to Figure 15 ;

[0048] 3.2.3) Install the tensioning tooling 3-5 for the radial cables using the truck crane 4. Please refer to Figure 16 ;

[0049] 3.2.4) Complete the installation and pre-tightening of all the radial cables 3-4. Please refer to Figure 17 and Figure 18 .

[0050] 4) Tension the radial cables 3-4 in stages and synchronously on the ground. During the tensioning process, the roof arches upward, the middle part detaches from the central tension ring support frame, and the periphery descends onto the top circumferential truss of the main structure. Please refer to Figure 19 and Figure 11 . In this embodiment, the radial cables 3-4 are tensioned synchronously in 5 stages.

[0051] 5) Connect the roof to the hinge supports on the top circumferential truss.

[0052] 6) Remove the central tension ring support frame to complete the installation of the roof. Please refer to Figure 20 .

[0053] In this embodiment, the arching height during the above tensioning is 2 - 3 cm.

[0054] When the span of the top circumferential truss is relatively large, it cannot be hoisted in one go. It is necessary to set up temporary support columns 2 below it and complete the construction before hoisting the top circumferential truss. The structure and installation method of the temporary support columns 2 are the same as those of the above support columns 1.

[0055] In view of the construction problem that the cable-supported steel roof is difficult to install, the present invention proposes an installation construction method including a central tension ring support frame, a tensioning system, and a temporary support column for the top circumferential truss. By arranging a tension ring support frame in the middle, a complete temporary support structure is constructed by using the tension ring support frame and the top circumferential truss of the main structure. Under the action of construction loads, the temporary support structure can achieve force balance. The force of the temporary support structure is clear and the construction is convenient. When constructing the roof, the steel roof components are first hoisted onto the support structure. After all the components are hoisted and spliced, the entire roof is disengaged from the central tension ring support frame by tensioning the radial cables.

[0056] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A construction method for installing a long-span cable-supported steel roof, characterized in that Adopt the following steps: 1) Set the embedded steel plate of the central tension ring support during foundation construction; 2) Fix the central tension ring support on the embedded steel plate of the central tension ring support. The height of the central tension ring support is the design elevation of the corresponding part of the roof minus the jacking camber height; 3) Assemble the roof 3.1) Hoist the central tension ring onto the central tension ring support; 3.2) Install the roof members relying on the central tension ring and the top circumferential truss of the main structure; 3.3) Install the tensioning tooling for the radial cables; 3.4) Complete the installation and pre-tightening of all radial cables; 4) Tension the radial cables in stages and synchronously on the ground. During the tensioning process, the roof jacks up, the middle part disengages from the central tension ring support, and the periphery descends onto the top circumferential truss of the main structure; 5) Connect the roof to the hinge supports on the top circumferential truss; 6) Remove the central tension ring support to complete the installation of the roof.

2. The installation construction method of the long-span cable-supported steel roof described in claim 1 is characterized in that, In the step 2), the jacking camber height of the roof is 2 - 3 cm.

3. The installation construction method of the long-span cable-supported steel roof described in claim 1 is characterized in that, The central tension ring support is provided with 4 support columns, and adjacent support columns are connected by tie rods.

4. The installation construction method of the long-span cable-supported steel roof described in claim 3, characterized in that, The support column is provided with a base, a standard section and an adjustment section.

5. The installation construction method of the long-span cable-supported steel roof according to claim 4, characterized in that, The standard section is formed by connecting two side components and an abdominal component. The two side components are welded by members, and the abdominal component is connected to the two side components by flanges and bolts.

6. The installation construction method of the long-span cable-supported steel roof described in claim 4 is characterized in that, The base is made of double - spliced H - shaped steel.

7. The installation construction method of the long-span cable-supported steel roof described in any one of claims 1 to 6, characterized in that, When the span of the top circumferential truss is relatively large, temporary support columns are set below it.

Images