Construction method of large-span steel truss pot support

Abstract

The application provides a large-span steel truss pot support construction method, which comprises the following steps: installing a temporary support system, installing a truss, placing a jack and operating, installing a permanent support, and completing stress conversion. The application can avoid interruption of the construction process caused by support installation, deepens the design of the upper steel structure roof and the support, changes the sequential operation of the installation construction into parallel operation, and saves a large amount of time cost, labor cost and material cost.

Description

Technical Field

[0001] This invention relates to the field of steel truss pot bearing construction technology, specifically a construction method for large-span steel truss pot bearings. Background Technology

[0002] Currently, exhibition and sports stadium projects often use steel truss and space frame structures due to their unique shapes and large spans. This avoids the impact of dense support columns on the overall effect of the building's interior. However, due to the high strength and low stiffness of steel structures, the overall deformation of the building is relatively large. If rigid connections are used, it will lead to deformation and cracking of steel structure nodes and weld failure. Therefore, pot supports are often used to connect the column bases of large-span steel truss and steel space frame structures, thereby increasing their stress and deformation threshold.

[0003] If construction is carried out using conventional methods, i.e., installing the supports first and then constructing the steel structure above them, it will inevitably lead to a waiting period after the steel column base construction is completed (the next step of construction can only proceed after the detailed design and fabrication of the pot bearing joints are finished). This method results in a long construction cycle, a large construction gap, and difficulties in construction organization. In addition, the processing requirements for pot bearings are high and the processing cycle is long (generally 45 days), causing on-site construction interruptions and huge losses of manpower and material resources.

[0004] Therefore, how to solve the installation of large-span steel trusses and space frames, avoid construction interruptions caused by support installation, and achieve high-quality and efficient construction while ensuring safety has become an urgent problem to be solved in this field. Summary of the Invention

[0005] In view of the above-mentioned prior art, the present invention proposes a construction method for large-span steel truss pot bearings.

[0006] The present invention provides a construction method for a large-span steel truss pot bearing, comprising the following steps:

[0007] S1. Install a temporary support system: Set up column base foundations at the truss column bases to support the truss columns, and set up an enlarged foundation at each of the two ends of the column base foundations. After the column base foundations and enlarged foundations have reached the required strength, place temporary supports on the upper end of the column base foundations; install several first support frames for supporting the truss columns and several second support frames for supporting the truss main beams.

[0008] S2. Install the truss: After the steel structure truss is assembled in sections at the factory, it is transported to the site. The truss columns are placed on the first support frame and fixed to the upper end of the temporary support. The main beam of the truss is placed on the second support frame.

[0009] S3, placing a jack and working: a temporary support is arranged on both sides of the truss column foot, a jack is placed on the upper end of the enlarged foundation on both sides, the jack is in contact with the bottom of the temporary support, the temporary support is lifted by using the jack, the truss column foot and the truss column are slightly lifted by the temporary support, at this time, the temporary support is suspended and not stressed, and the temporary support is cut off;

[0010] S4, installing a permanent support: the temporary support is cut off, the permanent support is arranged instead of the temporary support and is finely adjusted to the design position, the jack is slowly released to the state that the temporary support is not stressed, at this time, the upper load is borne by the permanent support;

[0011] S5, completing stress conversion: the first and second support cradles are removed, and the stress conversion of the whole system is completed.

[0012] Preferably, in S1, the temporary support comprises a support frame, a support partition plate is fixed in the middle of the support frame, and stiffening ribs are fixed on both sides of the inside of the support frame.

[0013] Preferably, in S1, a column diagonal brace is arranged on the top of the first support cradle.

[0014] Preferably, in S1, a plurality of cable wind ropes are arranged on both sides of the first support cradle and the second support cradle.

[0015] Preferably, in S2, the truss column and the temporary support are fixed by welding.

[0016] Preferably, in S3, the temporary support and the truss column foot are connected by welding.

[0017] Compared with the prior art, the method has the advantages that: the method for constructing a large-span steel truss pot support provided by the application is provided with a temporary support system and a support conversion system, the temporary support system is connected with an upper steel structure permanent structure unit and a lower foundation, so that complete support of the upper structure can be realized when the permanent support is absent, the support conversion system comprises a temporary support and a jack, and the conversion from the temporary support to the permanent support can be realized. The method can avoid interruption of the construction process caused by installation of the support, the upper steel structure roof and the support are deepened in design, and installation and construction are changed from sequential operation to parallel operation, so that a large amount of cost of time, labor and material is saved. In addition, the installation process of the permanent support is postponed, the permanent support can be finely adjusted according to the stress condition of the upper steel structure during installation, and the situation that the support is eccentrically stressed or sheared, twisted or stressed in other ways due to installation of the support before installation of the upper steel structure is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A structural schematic diagram of an embodiment of the present application.

[0019] Figures 2-5 A partial structural schematic diagram of an embodiment of the present application.

[0020] In the figure: 1, truss column foot; 2, truss stand column; 3, column foot foundation; 4, enlarged foundation; 5, support frame; 6, support partition; 7, stiffener; 8, first support jig; 9, truss girder; 10, second support jig; 11, stand column diagonal brace; 12, cable wind rope; 13, temporary support column; 14, jack; 15, permanent support. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific figures. EMBODIMENT

[0022] A large-span steel truss pot support construction method, comprising the following steps:

[0023] S1, installing a temporary support system: as shown in Figures 1-3 , a column foot foundation 3 for supporting a truss stand column 2 is constructed at the position of the truss column foot 1, an enlarged foundation 4 is constructed on both sides of the column foot foundation 3, after the column foot foundation 3 and the enlarged foundation 4 reach the strength, a temporary support is placed on the upper end of the column foot foundation 3, the temporary support comprises a support frame 5, a support partition 6 is fixed in the middle of the support frame 5, X-shaped stiffeners 7 are fixed on both sides of the inside of the support frame 5, the support partition 6 and the stiffeners 7 can prevent the support frame 5 from deforming; a plurality of first support jigs 8 for supporting the truss stand column 2 and a plurality of second support jigs 10 for supporting the truss girder 9 are installed, a stand column diagonal brace 11 is installed on the top of the first support jig 8, and two anti-toppling cable wind ropes 12 are installed on both sides of the first support jig 8 and the second support jig 10.

[0024] S2, installing the truss: as shown in Figure 1 , after the steel structure truss is completed in blocks in the factory, it is transported to the site, the truss stand column 2 is placed on the stand column diagonal brace 11 and welded and fixed on the upper end of the temporary support, and the truss girder 9 is placed on the upper end of the second support jig 10.

[0025] S3, placing the jack and operating: as shown in Figure 4As shown, a temporary support 13 is welded on both sides of the truss column foot 1, the temporary support 13 is made of steel material, a jack 14 is placed on the upper end of the enlarged foundation 4 on both sides, the jack 14 is in opposite contact with the bottom of the temporary support 13, the temporary support 13 is lifted by using the jack 14, so that the temporary support 13 drives the truss column foot 1 and the truss column 2 to slightly rise, at this time, the temporary support is suspended and not stressed.

[0026] S6, installing a permanent support: cutting off the temporary support, replacing the temporary support with a permanent support 15 and fine-tuning to the design position, slowly releasing the pressure of the jack 14 to the temporary support 13, at this time, the upper load is borne by the permanent support 15, and the temporary support 13 is cut off.

[0027] S7, completing the stress conversion: removing the first and second support cradles (8, 10), as shown, the upper load is transmitted to the column foot foundation 3 through the permanent support 15, and the stress conversion of the whole system is completed. Figure 5

[0028] The temporary support system and the support conversion system are provided, the temporary support system is connected with the upper steel structure permanent structure unit and the lower foundation, so that the complete support of the upper structure is realized when the permanent support is lacking, the support conversion system includes the temporary support 13 and the jack 14, and the conversion from the temporary support to the permanent support can be realized. The construction process interruption caused by the support installation can be avoided, the upper steel structure roof and the support are deepened, the installation and construction are changed from sequential operation to parallel operation, and a large amount of construction period cost and manpower and material cost are saved. In addition, the installation process of the permanent support 15 is post-positioned, the permanent support 15 can be fine-tuned according to the stress condition of the upper steel structure during installation, and the eccentric stress or shear stress, torsion stress and other stress conditions of the support part caused by the installation of the support and then the installation of the upper steel structure are avoided.

[0029] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure, direct or indirect application in other related technical fields according to the content of the specification and the drawings of the present application is also within the patent protection range of the present application.​

Claims

1. A construction method of a large-span steel truss pot support, characterized by, The method comprises the following steps: S1, installing a temporary support system: setting a column base for supporting the truss column at the position of the truss column foot, setting an enlarged foundation on both sides of the column base, respectively, after the column base and the enlarged foundation reach the strength, placing a temporary support on the upper end of the column base; installing a plurality of first support cradles for supporting the truss column and a plurality of second support cradles for supporting the truss girder; S2, installing the truss: after the steel structure truss is assembled in blocks in the factory, it is transported to the site, the truss column is placed on the first support cradle, and is fixed on the upper end of the temporary support, the truss girder is placed on the second support cradle; S3, placing a jack and operating: a temporary support is arranged on both sides of the truss column foot, respectively, a jack is placed on the upper end of the enlarged foundation on both sides, respectively, the jack is in opposite contact with the bottom of the temporary support, the temporary support is lifted by using the jack, the temporary support drives the truss column foot and the truss column to slightly rise, at this time, the temporary support is suspended and not stressed, the temporary support is cut off; S4, installing a permanent support: the temporary support is cut off, the permanent support is replaced by the temporary support and is fine-tuned to the design position, the jack is slowly released to the temporary support, at this time, the upper load is borne by the permanent support; S5, completing the stress conversion: the first and second support cradles are removed, and the stress conversion of the whole system is completed.

2. The construction method of a long-span steel truss pot support according to claim 1, characterized by, In S1, the temporary support comprises a support frame, a support partition is fixed in the middle of the support frame, and a reinforcing bar is fixed on both sides of the inside of the support frame.

3. The construction method of a long-span steel truss pot support according to claim 1 or 2, characterized in that, In S1, a column diagonal brace is installed on the top of the first support cradle.

4. The construction method of a long-span steel truss pot support according to claim 1 or 2, characterized in that, In S1, a plurality of cable wind ropes are installed on both sides of the first support cradle and the second support cradle.

5. The construction method of a long-span steel truss pot support according to claim 1 or 2, characterized in that, In S2, the truss column and the temporary support are fixed by welding.

6. The construction method of a long-span steel truss pot support according to claim 1 or 2, characterized in that, In S3, the temporary support is connected with the truss column foot by welding.

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