Construction method of large-span spiral stepped truss

Abstract

The application discloses a large-span spiral stepped truss construction method, characterized in that the method comprises the following steps: determining a reasonable segmentation method through modeling analysis by using finite element software in the deepening design stage, processing and manufacturing corresponding components according to the segmentation method in a factory, setting a special splicing jig frame on site, completing truss segmentation splicing on the ground, setting a latticed column temporary support at the truss segmentation position, then successively hoisting the ring trusses of each subarea in the divergent direction of the large-span spiral stepped truss, and when unloading, the subarea, grading and synchronous unloading are realized by using a jack from the outer ring to the inner ring of the spiral stepped truss. The construction method of'reasonable segmentation, ground segmentation splicing, segmented support, subarea segmentation hoisting and subarea grading unloading' effectively reduces the amount of high-altitude welding operation, reduces the safety risk of high-altitude operation, guarantees the installation precision, improves the construction efficiency, and has high popularization value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a large-span spiral stepped truss construction method. BACKGROUND

[0002] With the rapid development of China's economy, large-span steel structures have been widely used in large public buildings. Large public buildings such as stadiums, exhibition halls, airports, railway stations and high-speed railway stations in major cities often use large-span steel structures, which have unique and beautiful shapes, various spatial forms and large scales, and have become a symbol of a city's modernization.

[0003] The construction of large public building steel structures such as stadiums often faces problems such as complex construction procedures, difficult installation precision control, and large amount of high-altitude welding work. Effective measures need to be taken according to the actual structure and site construction conditions to ensure the safety, quality and efficiency of construction.

[0004] As shown in the drawings Figure 2 and the drawings Figure 3 show a large-span spiral stepped steel pipe truss roof of a certain stadium, which mainly has the following construction difficulties: (1) large span, the maximum span of the truss is 119m, which belongs to a dangerous project exceeding a certain scale. (2) Large amount of high-altitude welding work, narrow construction site, difficult installation precision control, etc. (3) The large-span spiral stepped steel pipe truss roof of the stadium has a unique and novel shape, and the structure is complex, so the construction is difficult, and there is no construction method for large-span spiral stepped trusses at present. SUMMARY

[0005] In order to overcome the defects in the prior art, the present application provides a large-span spiral stepped truss construction method, which effectively reduces the amount of high-altitude welding work, reduces the safety risk of high-altitude work, ensures the installation precision, and improves the construction efficiency by using the construction method of "reasonable segmentation, ground segmentation, segmented support, zoned and segmented hoisting, and zoned and graded unloading".

[0006] In order to achieve the above purpose, the present application provides a large-span spiral stepped truss construction method, comprising:

[0007] A 3D model of the large-span spiral stepped truss is constructed, and the large-span spiral stepped truss is divided into a central zone, at least one first component zone located on the periphery of the central zone, and a second component zone located on the outer side of the large-span spiral stepped truss along the divergent direction from inside to outside, and the components in the corresponding zones are processed and manufactured in the processing plant.

[0008] After the component processing is completed, the component is transported to the site, a special splicing jig is arranged on the site according to the space shape of the corresponding partition, and the splicing of the components in the central area, at least one first component area and the second component area is completed on the ground;

[0009] After the component splicing is completed, a plurality of temporary supports are arranged below the large-span spiral stepped truss in the height direction, and a jack is fixedly installed at the top of the temporary support in the height direction;

[0010] The jacking of the components in the at least one first component area, the central area and the second component area is sequentially carried out in the divergent direction of the large-span spiral stepped truss by the jack and in cooperation with the crawler crane and the automobile crane, and the correction and adjustment are carried out at the same time.

[0011] After the jacking and composite correction of all components of the large-span spiral stepped truss are completed, the temporary supports are unloaded from the outer ring to the inner ring of the large-span spiral stepped truss in the order of the first component area, the central area and the second component area by the jack.

[0012] Preferably, the temporary support adopts a lattice column, and the jack is fixedly installed at the top of the lattice column in the height direction.

[0013] Preferably, the graded unloading protection device composed of a support column and a steel pad is installed at the unloading point when the temporary support is unloaded.

[0014] Due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0015] 1) In the deepening design stage, the structure is reasonably partitioned according to the stress condition, and then the reasonable segmentation method is determined through modeling calculation and simulation analysis by using the finite element software, so as to effectively ensure the installation precision and improve the construction efficiency.

[0016] 2) The special splicing jig is arranged on the site, the special jig is adjusted according to the space shape of the segmented truss, and the multi-point support mode is adopted to complete the truss segmentation splicing on the ground, so as to improve the truss segmentation splicing precision.

[0017] 3) The lattice column temporary support is arranged at the segmented main truss, and the jack is used to finely adjust the height of the truss, so as to effectively ensure the stability and installation precision of the structure.

[0018] 4) The jacking is sequentially carried out in the segmented direction of the spiral stepped truss, and the correction and adjustment are timely carried out, so as to ensure the installation precision, safety and stability of the structure in the construction process and improve the construction efficiency.

[0019] 5) The jack is used to unload the partition, the stage and the synchronization from the outer ring to the inner ring of the spiral stepped truss, so as to ensure the safety and stability of the structure in the unloading process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a Midas Gen finite element calculation model diagram used for simulation analysis of the construction process in the large-span spiral stepped truss construction method of this invention.

[0022] Figure 2 A Tekla Structures model drawing for the detailed design of a large-span spiral stepped truss roof for a stadium.

[0023] Figure 3 It is attached Figure 2 A top view of a Tekla Structures model of a medium-to-large span spiral stepped truss.

[0024] Figure 4 This is a schematic diagram of the construction zoning in the construction method of the large-span spiral stepped truss of the present invention.

[0025] Figure 5 This is a schematic diagram of the segmented plan view of the large-span spiral stepped truss construction method of the present invention.

[0026] Figure 6 It is attached Figure 1 Plan layout of temporary supports for lattice columns.

[0027] Figure 7 It is attached Figure 2 A schematic diagram of the structure of area A4 in the diagram.

[0028] Figure 8 It is attached Figure 2 A schematic diagram of the A3 area structure.

[0029] Figure 9 It is attached Figure 2 A schematic diagram of the A2 area structure.

[0030] Figure 10 It is attached Figure 2 A schematic diagram of the A1 region structure.

[0031] Figure 11 It is attached Figure 2 A schematic diagram of the B1 region structure.

[0032] Figure 12 It is attached Figure 7Typical segmental schematic view of the fourth ring truss in A4 area.

[0033] Figure 13 is attached Figure 8 Typical segmental schematic view of the third ring truss in A3 area.

[0034] Figure 14 is attached Figure 9 Typical segmental schematic view of the second ring truss in A2 area.

[0035] Figure 15 is attached Figure 10 Typical segmental schematic view of the first ring truss in A1 area.

[0036] The corresponding relationship between the reference signs in the drawings is as follows:

[0037] 1-large span spiral stepped truss; 2-lattice column temporary support; 3-fourth ring truss in A4 area; 4-third ring truss in A3 area; 5-second ring truss in A2 area; 6-first ring truss in A1 area; 7-A1 area center bucket screen; 8-V-shaped steel column; 9-round steel pipe column; 10-radial truss in A4 area; 11-radial member in A4 area; 12-radial member in A3 area; 13-radial member in A2 area; 14-radial truss in A2 area; 15-ring member in A1 area; 16-radial member in A1 area; 17-truss in B1 area; 18-steel beam in B1 area; 19-radial member in B1 area; 20-top chord; 21-inclined web member; 22-vertical web member; 23-bottom chord. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be further described below in conjunction with the drawings. It should be noted that the description of the embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0039] The technical problem to be solved by the present application is to use a construction method for a large span spiral stepped truss which is not disclosed in the prior art, as shown in Figure 2 and Figure 3The stadium building shown features a large-span spiral stepped truss roof, primarily composed of four outward-radiating annular spiral plane trusses, a central screen truss, radial members, ring members, and secondary members. Its unique and novel design resembles a conch shell. Therefore, its construction challenges lie mainly in its complex spatial structure, large span, unique structural form, large workload, narrow construction site, complex nodes, and difficulty in controlling installation accuracy. To address these technical challenges, this invention proposes a construction method for a large-span spiral stepped truss. Through "reasonable segmentation, ground-level segmented splicing, segmented support, zoned segmented hoisting, and zoned and graded unloading," it comprehensively considers factors such as reasonable structural stress, construction safety and quality, construction efficiency, hoisting machinery and equipment, and ease of on-site construction. This effectively reduces the amount of high-altitude welding work, lowers the safety risks of high-altitude operations, ensures installation accuracy, and improves construction efficiency. It should be noted that, as shown in the attached... Figure 4 As shown, by considering the structural form and adapting to the stress conditions of the structure, the large-span spiral stepped truss is divided into a central area, three first component areas, and one second component area. The central area is area A1, the first component areas include three areas A2, A3, and A4, and the second component area is area B1. That is, the large-span spiral stepped truss 1 is divided into a ring truss including four areas A3, A2, A1, and A4 along the divergence direction of the spiral ring truss, as well as the B1 area truss located outside the spiral ring truss.

[0040] Please see Figure 10 and Figure 15 As shown, the structure of area A1 includes the first ring truss 6 of area A1, the central screen 7 of area A1, the circumferential members 15 of area A1, and the radial members 16 of area A1. The first ring truss 6 of area A1 includes an upper chord 20 and a lower chord 23 arranged along the height direction of the large-span spiral stepped truss 1 and distributed in a ring, as well as vertical web members that are vertically fixed between the upper chord 20 and the lower chord 23 and diagonal web members 21 that are diagonally connected between the upper chord 20 and the lower chord 23.

[0041] Please see Figure 9 and Figure 14 As shown, the structure of area A2 includes the second ring truss 5 of area A2, radial members 13 of area A2, and radial truss 14 of area A2. The second ring truss 5 of area A2 includes an upper chord 20 and a lower chord 23 arranged along the height direction of the large-span spiral stepped truss 1 and distributed in a ring, as well as vertical web members that are vertically fixed between the upper chord 20 and the lower chord 23 and diagonal web members 21 that are diagonally connected between the upper chord 20 and the lower chord 23.

[0042] Please see Figure 8 and Figure 13As shown in the drawings, the A3 region structure comprises an A3 region third ring truss 4 and an A3 region radial rod 12, wherein the A3 region third ring truss 4 comprises upper chords 20, lower chords 23 and vertical web members and diagonal web members 21 fixedly connected between the upper chords 20 and the lower chords 23, which are arranged along the height direction of the large-span spiral stepped truss 1 and distributed in a ring shape.

[0043] As shown in the drawings, Figure 7 and Figure 12 As shown in the drawings, the A4 region structure comprises an A4 region fourth ring truss 3 and an A4 region radial rod 11, wherein the A4 region fourth ring truss 4 comprises upper chords 20, lower chords 23 and vertical web members and diagonal web members 21 fixedly connected between the upper chords 20 and the lower chords 23, which are arranged along the height direction of the large-span spiral stepped truss 1 and distributed in a ring shape.

[0044] As shown in the drawings, Figure 11 As shown in the drawings, the B1 region structure comprises a B1 region truss 17, a B1 region steel beam, a B1 region radial rod 19 and a plurality of circular steel pipe columns 9 arranged along the height direction of the large-span spiral stepped truss 1.

[0045] As shown in the drawings, Figure 5 As shown in the drawings, the A1 region first ring truss 6 is divided into 9 segments, the A2 region second ring truss 5 is divided into 18 segments, the A3 region third ring truss 4 is divided into 32 segments, and the A4 region fourth ring truss 3 is divided into 34 segments, wherein HJ1 represents the truss number of the A1 region, HJ2 represents the truss number of the A2 region, HJ3 represents the truss number of the A3 region, HJ4 represents the truss number of the A4 region, and YP-HJ represents the truss number of the B1 region.

[0046] As shown in the drawings, Figure 6 As shown in the drawings, the temporary support adopts a lattice column temporary support 2, and the top of the lattice column temporary support 2 is fixedly installed with a jack for fine adjustment of the height of the large-span spiral stepped truss 1 along the height direction, wherein 130 temporary supports are arranged in the A1, A2, A3 and A4 regions, and 20 temporary supports are arranged in the B1 region, and there are a total of 150 support points.

[0047] The large-span spiral stepped truss construction method comprises the following steps:

[0048] 1) In the deepening stage of large-span spiral stepped truss steel structure, the Tekla Structures model of the large-span spiral stepped truss roof of the gymnasium is constructed, a reasonable segmentation method is determined by considering factors such as reasonable segmentation of structure stress, component processing and manufacturing, component transportation, structure component splicing and hoisting, etc., laying a good foundation for steel structure processing and manufacturing and on-site construction, and real-time monitoring is performed on the position, elevation, deformation and strain of key parts during construction, and corresponding technical measures are taken for correction and adjustment to ensure the installation accuracy, safety and stability of the structure;

[0049] 2) After the component is processed, it is transported to the site, and after the component is accepted, a special splicing jig is set up on site, the special splicing jig is adjusted according to the spatial shape of the segmented truss, and a multi-point support mode is adopted to complete the segmented splicing of the third ring truss 4 of the A3 area and the second ring truss 5 of the A2 area on the ground.

[0050] 3) After the corresponding parts of the civil engineering, such as columns, beams, plates and spherical supports, are constructed, the temporary support 2 of the lattice column in the A3 area and the A2 area is installed;

[0051] 4) After the temporary support 2 of the lattice column in the A3 area and the A2 area is installed and ready, the third ring truss 4 of the A3 area and the second ring truss 5 of the A2 area are hoisted and spliced in sequence by a crawler crane and a truck crane, and the installation sequence is along the divergent direction of the spiral ring truss, and the radial members 12 and the secondary members in the A3 area are installed at the same time to form a local stable system;

[0052] 5) The temporary support 2 of the lattice column in the A1 area is installed, and a jack is arranged on the top of the temporary support 2 of the lattice column in the height direction, which is used for fine adjustment of the height of the truss;

[0053] 6) A special splicing jig is arranged according to the spatial shape of the first ring truss 6 of the A1 area, and a multi-point support mode is adopted to complete the segmented splicing of the first ring truss 6 of the A1 area on the ground;

[0054] 7) The first ring truss 6 of the A1 area is hoisted and spliced in sequence by a crawler crane and a truck crane, and the installation sequence is along the divergent direction of the spiral ring truss, and the radial members 13 and the secondary members in the A2 area are installed at the same time to form a local stable system with the installed ring truss.

[0055] 8) The radial members 16 of the A1 area, the ring members 15 of the A1 area, the central bucket screen 7 of the A1 area and the secondary members are hoisted and spliced in sequence by a crawler crane and a truck crane to form a local stable system with the installed ring truss.

[0056] 9) Install A4 area lattice column temporary support 2, and set up jack at the top of lattice column temporary support 2 along the height direction to make detailed adjustment to the truss height.

[0057] 10) According to the spatial shape of the fourth ring truss 3 in the A4 area, a special splicing jig frame is arranged, and the segmented splicing of the fourth ring truss 3 in the A4 area is completed on the ground in a multi-point support manner.

[0058] 11) The fourth ring truss 3 in the A4 area is sequentially hoisted in segments by a crawler crane and a truck crane, and other secondary members such as the radial truss 10 and the radial member 11 in the A4 area and the V-shaped steel column 8 are installed in the diverging direction of the spiral ring truss, and the ring truss and the V-shaped steel column 8 in the A4 area are effectively connected with the spherical support to form a stable system with the installed ring truss, and it should be noted that the installation method is in reverse order, that is, the large-span spiral stepped truss roof is installed first, and then the V-shaped steel column connected with the main structure is installed.

[0059] 12) Install B1 area lattice column temporary support 2, and set up jack at the top of lattice column temporary support 2 along the height direction to make detailed adjustment to the truss height.

[0060] 13) According to the spatial shape of the fourth ring truss 3 in the B1 area, a special splicing jig frame is arranged, and the segmented splicing of the truss 17 in the B1 area is completed on the ground in a multi-point support manner, and then the truss 17 in the B1 area is sequentially hoisted in segments by a crawler crane and a truck crane, and other secondary members such as the steel beam 18 in the B1 area and the radial member 19 in the B1 area are installed, and then the steel column in the B1 area is installed to form a stable system with the installed B1 area structure.

[0061] 14) After the large-span spiral stepped truss 1 is completely installed, timely review and correction are performed, and after confirmation of no error, unloading is started.

[0062] 15) The unloading is performed from the outer ring to the inner ring of the large-span spiral stepped truss 1, and the jack is used for partition, grading, and synchronous unloading, and the unloading is divided into four levels, and the unloading amount of the first to third levels is 30%, and the unloading amount of the fourth level is 10%, and the unloading sequence is A4 area unloading→A3 area unloading→A2 area unloading→A1 area unloading→B1 area unloading, and the unloading should be performed in a partitioned and synchronous manner, and a support column and a steel pad are arranged at the unloading point to form a grading unloading protection device, so as to ensure the safety and stability of the structure during unloading.

[0063] The embodiments of the application are described in detail in combination with the drawings, but the application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements, and variations of the embodiments can be made without departing from the principles and spirits of the application, and still fall within the protection scope of the application.

Claims

1. A construction method of a large-span spiral stepped truss, characterized by, The method comprises the following steps: A 3D model of the large-span spiral stepped truss is constructed, and the large-span spiral stepped truss is divided into a center area, at least one first component area located outside the center area, and a second component area located in the outer area of the large-span spiral stepped truss along the divergence direction from inside to outside, wherein the at least one first component area comprises ring trusses in the area along the divergence direction of the spiral ring truss, and the second component area comprises trusses located in the outer area of the spiral ring truss, and the processing and manufacturing of the components in the corresponding areas are carried out in a processing factory; After the component processing is completed, the components are transported to the site, a special splicing jig frame is set up on site according to the spatial shape of the corresponding area, and the splicing of the components in the center area, the first component area, and the second component area is completed on the ground; After the component splicing is completed, a plurality of temporary supports are arranged below the large-span spiral stepped truss along the height direction, and jacks are fixedly installed on the top of the temporary supports along the height direction; The jacks are used to sequentially lift the components in the at least one first component area, the center area, and the second component area along the divergence direction of the large-span spiral stepped truss by cooperating with a crawler crane and a car crane, and the components are adjusted and corrected during lifting; After all the components of the large-span spiral stepped truss are lifted and corrected, the temporary supports are unloaded from the outer ring to the inner ring of the large-span spiral stepped truss in the order of the first component area, the center area, and the second component area by using the jacks.

2. The construction method of a large-span spiral stepped truss according to claim 1, characterized in that: The temporary supports are lattice columns, and the jacks are fixedly installed on the top of the lattice columns along the height direction.

3. The construction method of a large-span spiral stepped truss according to claim 1, characterized in that: When the temporary supports are unloaded, a hierarchical unloading protection device composed of a support column and a steel pad is installed at the unloading point.

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