Construction method of steel structure net rack

Abstract

The invention discloses a construction method of a steel structure net rack, and relates to the technical field of constructional engineering. According to the construction method, a large number of all-round scaffolds do not need to be erected to serve as supports, other procedures can be operated alternately in the net rack installation process, the construction difficulty can be reduced, and the installation efficiency and the installation safety of the steel structure net rack can be improved; the construction method comprises the steps of setting a block hoisting area, an assembling area, a material stacking area, a truck crane and a tower crane; the steel net rack is divided into a plurality of block net racks, and each block net rack is assembled; a fixed hinged support is mounted at the top of the concrete structural column; hoisting in blocks; high-altitude assembling installation or block hoisting of the steel net rack is carried out between the adjacent block net racks; and welding the partitioned net rack and the fixed hinged support, and performing detection and inspection.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a construction method of a steel structure grid. Background Art

[0002] The steel grid structure is a spatial structure composed of multiple rods connected by nodes in a certain grid form. It has the advantages of spatial force, light weight, high rigidity and good seismic performance. It is widely used in the roof structure of buildings such as gymnasiums, exhibition halls, theaters, and waiting halls.

[0003] The installation of steel grid structure mainly includes high-altitude bulk method of full-floor scaffolding and overall lifting method, all of which have certain defects. The high-altitude bulk method of full-floor scaffolding requires that after the construction of the ground concrete structure is completed, the full-floor scaffolding is erected on the structural board to the designed elevation, and then the scaffolding boards are fully laid on the full-floor scaffolding as the operating surface. When this method is used for construction, the entire construction period of the steel structure is delayed, and the full-floor scaffolding must be removed after the steel structure is installed. During this period, other processes in the steel structure construction area of ​​the venue cannot be interspersed with construction; the time for the early erection and later dismantling of the scaffolding is long, and the erection of the full-floor scaffolding requires a large amount of steel pipe materials, which is costly; for irregular-shaped steel grids, high-altitude bulk is more difficult and less efficient. The overall lifting method is to assemble the steel grid on the ground, then use multiple sets of pull rods or multiple large truck cranes to lift the steel grid to the designed elevation and then drop it into place on the support. The overall lifting method allows other processes to be carried out during the lifting process. However, when there are floors and uneven stands indoors, the floor is not on the same plane and the steel grid cannot be lifted as a whole.

[0004] The steel grid structure has a large number of rods converging at the nodes, making it difficult to install. In some building structures, the steel grid is irregular in shape, with a large span and a certain height difference. Moreover, the installation of the steel grid is limited by site conditions and large lifting equipment cannot be used. How to reduce the construction difficulty of this type of steel grid and improve construction quality and efficiency is crucial to the construction quality and construction period of the entire building.

[0005] After the steel grid structure is installed, in order to meet the needs of various occasions in the venue, a steel structure horseway needs to be set up in the venue to facilitate the arrangement of stage machinery facilities, lighting equipment, pipelines, controllers and other equipment in the venue; during the installation of the horseway, the horseway is usually installed in blocks inside the steel grid. This installation method is inefficient and not conducive to lighting. The steel grid will block the light and affect the aesthetics; the installation of the horseway is usually carried out indoors after the steel grid is installed. When installing the horseway indoors, due to the interference of the steel grid, it is impossible to use external large-scale equipment to hoist the horseway, and the installation of the horseway is difficult. How to set up and install the horseway structure and improve the installation efficiency and construction safety of the horseway have become key issues to be considered in the construction of steel structure grids and horseways. Summary of the invention

[0006] At least one of the purposes of the present invention is to provide a construction method for a steel structure grid in order to overcome the problems existing in the above-mentioned prior art. During the installation of the steel grid, the processes of other departments can be interspersed to ensure construction safety, reduce the construction difficulty of the steel grid and the horseway, and improve the construction quality and efficiency.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention includes the following aspects.

[0008] A construction method for a steel structure grid comprises the following steps: Step A, construction preparation: on the outside of the roof frame structure, block assembly and hoisting areas are respectively set along the two short sides of the roof frame structure, a truck crane is set on the first long side of the roof frame structure, a truck crane and a tower crane are set on the second long side of the roof frame structure, and a material stacking area is set at the corresponding position of the block assembly and hoisting area; Step B, block assembly; determine the size of the block grid, divide the steel grid into multiple block grids according to the adjacent support nodes of the steel grid installation, and use a tower crane to assemble the block grid in the block assembly and hoisting area; Step C, installation of fixed hinge support: installing the fixed hinge support on the top of the concrete structural column of the roof frame structure, and connecting the fixed hinge support with the support embedded part; Step D, block hoisting: using the automobile cranes on the two long sides of the roof frame structure to cooperate with the hoisting of the block grid, and hoisting the multiple block grids to the preset positions on the top of the roof frame structure for installation; Step E, connecting blocks; performing high-altitude loose assembly or block hoisting of steel grids in the bulk area between adjacent block grids; Step F, support welding: welding the block grid to the fixed hinge support; Step G, inspection and acceptance; including axis deviation inspection of steel grid and fixed hinge support, elevation deviation inspection of fixed hinge support, deflection inspection of steel grid, connection inspection of high-strength bolts and bolt ball nodes.

[0009] Preferably, the overall shape of the steel grid is a rectangular structure, and the edges of the steel grid are cantilevered 5 to 8 meters from the roof frame structure; the steel grid is an upright quadrangular pyramid double-layer grid structure, and its node form is a bolt ball node, and the lower chord of the steel grid is supported at multiple points by concrete structural columns of the roof frame structure; the steel grid is divided into block grid one, block grid two, block grid three and block grid four; block grid two and block grid four are respectively arranged close to the two short sides of the roof frame structure, and the block grid one and block grid three are located between block grid two and block grid four, and block grid one is arranged close to block grid two.

[0010] Preferably, the block grid 1 and the block grid 2 are assembled in the block assembly and hoisting area on one side of the roof frame structure, and the block grid 3 and the block grid 4 are assembled in the block assembly and hoisting area on the other side of the roof frame structure; When hoisting the segmented grid in the step D, 130t truck cranes on the two long sides of the roof frame structure are used for hoisting, and the sequence of hoisting the segmented grid is the sequence of segmented grid one, segmented grid two, segmented grid three and segmented grid four; during the hoisting process, two truck cranes hoist the segmented grid one and segmented grid two to the preset positions on the top of the roof frame structure on one short side of the roof frame structure, and then hoist the segmented grid three and segmented grid four to the preset positions on the top of the roof frame structure on the other short side of the roof frame structure.

[0011] Preferably, the specific process of hoisting each block of the grid includes: Step D1, connecting the two ends of the block grid to the truck crane respectively; determining the positions of the hanging points at both ends of the block grid, using two steel wire ropes to tie four upper chord ball nodes at the hanging points at each end, and then connecting the two steel wire ropes to the truck crane; Step D2, trial lifting; synchronously control two mobile cranes, the mobile cranes pre-tighten the wire ropes and then slowly lift synchronously, pause for a while after the block grid leaves the ground platform support, and check whether the rods of the block grid are deformed by force; after confirming that the rods of the block grid are not deformed, synchronously lift the block grid, and when the block grid is lifted to 300-500mm from the ground, pause for 20-30min to observe whether the rods and nodes of the block grid are deformed after being fully stressed or whether the node bolts are not tightened in place; Step D3, lifting and hoisting; command two truck cranes to synchronously lift the block grid until it is lifted to a height higher than the bottom elevation of the fixed hinge support; during the lifting process, use a level to observe the balance of the block grid for 5 to 10 minutes every 2 meters of lifting, and coordinate the lifting heights of the two truck cranes at the same time, so that the balance deviation of the block grid is less than 5%; Step D4, translation into position; measuring the distance between the lower chord ball of the block grid and the corresponding fixed hinge support, and after clarifying the translation distance and direction of the block grid, the commander sends an overall synchronous translation signal, and the two truck cranes translate the block grid synchronously to the fixed hinge support; when the center of the lower chord ball of the block grid coincides with the center of the fixed hinge support, the two truck cranes are synchronously controlled to lower the height of the block grid until the lower chord ball of the block grid is in place at the center of the fixed hinge support; Step D5, fix the block grid; keep the mobile crane in the hoisting state, adjust the axis and elevation of the lower chord ball of the block grid, fix the fixed hinge support and the lower chord ball, and then release the wire rope of the lifting point.

[0012] Preferably, before the block hoisting in step D, the height of the scaffolding on the outside of the roof frame structure is dismantled to be equal to the height of the fixed hinge support, and a lifeline one is set circumferentially on the roof frame structure beam, and the lifeline one is passed through the L75*8 angle steel on the top of the roof frame structure beam. A steel pipe scaffolding vertical ladder and a ∅20 vertical hemp rope are set at one end of one of the block grids; then, an angle steel bracket is welded at the upper chord ball node of each block grid, and a lifeline two is stretched along the longitudinal span direction of the block grid.

[0013] Preferably, the step E comprises: step E1, assembling small units on the ground according to the high-altitude scattered assembly order and the grid rod numbering, and placing the assembled small units in the order of numbering; step E2, using a tower crane to cooperate with high-altitude scattered personnel to install the small units; in the step B, when assembling the block grid, the first suspension rod is respectively installed at the preset positions on both sides of the length direction of each block grid; in the step E, when assembling the small units, according to the design drawings of the horseway and the steel grid, the first suspension rod is installed at the preset position of the corresponding small unit; or after the overall installation of the steel grid is completed, the first suspension rod is installed at the preset position on the steel grid; the first suspension rod is connected to the lower chord ball or lower chord rod of the steel grid.

[0014] Preferably, the process of performing block hoisting in the bulk area between adjacent block grids in step E comprises: The block grid is installed in each bulk area from the starting section to the end section of the long side of the roof frame structure; the installation process of the block grid of the first bulk area includes: On the inner side of the roof frame structure, lattice columns are respectively arranged near the two long sides of the roof frame structure, and a temporary support is arranged at the top center of the lattice column, and the setting height of the temporary support is the same as that of the fixed hinge support; Hoist the block grid to a level higher than the installed block grid in the same manner as steps D1 to D3; In the same manner as step D4, the block grid is translated to the position of the lattice column, so that the lower chord ball of the block grid is positioned at the center of the temporary support, and the lattice column and the temporary support temporarily support the block grid; In the same manner as step D5, fix the lower chord ball of the block grid and release the wire rope at the hanging point; After all the installed block grids between adjacent block grids are hoisted in place, the adjacent block grids are connected and fixed; The lattice columns of the first bulk area are removed, and the block grids of the next bulk area are installed in the same manner as the first bulk area until the block grids of all bulk areas are installed.

[0015] Preferably, after the first hanger is installed, the method further includes step H, assembling a steel structure horseway in the roof frame; step I, setting a horseway lifting device; step J, after connecting the lifting device to the first horseway, lifting the first horseway, connecting the first horseway to the first hanger, and keeping the lifting device and the first horseway connected; step K, arranging two first safety ropes respectively along the height direction of the first hanger, and setting a second safety rope near the middle of the first horseway; step L, using the second hanger to connect the first horseway and the steel grid.

[0016] Preferably, after the first horseway is installed, second horseways are installed at both ends of the first horseway, one end of the second horseway is connected to the first horseway, and the other end of the second horseway is connected to the horseway embedded part on the wall.

[0017] Preferably, before the construction of step E, a double-hook safety belt is hung on the lifeline 2 and the rod of each block grid, and a horizontal safety net is set in the bulk area between adjacent block grids; the setting method of the horizontal safety net includes: laying the horizontal safety net on the ground corresponding to the bulk area, and then using ropes to lift the horizontal safety net to the position of the lower chord of the block grid at the adjacent block grid, and using binding ropes to firmly bind the horizontal safety net and the lower chord of the block grid, and the spacing between adjacent binding points is not more than 100 cm.

[0018] In summary, due to the adoption of the above technical solution, the present invention has at least the following beneficial effects: By dividing the steel grid into multiple block grids, after the block grids are assembled on the ground, the block grids are hoisted to the preset positions on the top of the roof frame structure for installation, which can reduce the difficulty of hoisting the steel grid and improve the safety of steel grid construction; during the hoisting and installation of the block grids, the processes of other departments can be interspersed, which is conducive to improving the installation and construction efficiency of the steel grid; moreover, during the installation of the block grids, only the scaffolding on the outside of the roof frame structure is needed as a pedestrian passage, and there is no need to set up a full-floor scaffolding as support, which saves the work of setting up and dismantling the scaffolding and further improves the construction efficiency.

[0019] After the segmented grid is installed, the segmented grids are connected into a steel grid with an integral structure by installing the segmented grids in a high-altitude scattered manner between adjacent segmented grids, thereby reducing the amount of high-altitude work. During the installation of the segmented grid, steel ladders are used for horizontal and vertical movement, which can reduce or eliminate the work of erecting scaffolding and further improve the construction efficiency and safety of the steel grid.

[0020] By setting lifeline 1 circumferentially on the roof frame structure beam, setting lifeline 2 on each block grid, hoisting lifeline 2 to the preset position together with the block grid, and then setting horizontal safety nets between adjacent block grids, the safety of high-altitude operations can be improved and the safety of construction workers can be guaranteed. By setting fixed hinge supports on the concrete structural columns of the roof frame structure, the torque generated by the steel grid can be released, so that the steel grid maintains the structural unity.

[0021] During the assembly of the segmented grid and the small units, the first suspension rod is connected to the preset position of the segmented grid and the small units. The first suspension rod is installed together with the segmented grid and the small units, which can reduce the difficulty of installing the horseway and improve the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a construction flow chart of a steel structure grid according to an exemplary embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the assembly site layout of an exemplary embodiment of the present invention.

[0024] Figure 3 It is a block schematic diagram of a steel grid according to an exemplary embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of assembling a block grid according to an exemplary embodiment of the present invention.

[0026] Figure 5 It is a schematic plan view of the lifting of a segmented grid according to an exemplary embodiment of the present invention.

[0027] Figure 6It is a schematic diagram from another perspective of the segmented grid hoisting of an exemplary embodiment of the present invention.

[0028] Figure 7 It is a schematic diagram of the fixed hinge support structure of an exemplary embodiment of the present invention.

[0029] Figure 8 Schematic diagram of lifeline arrangement according to an exemplary embodiment of the present invention.

[0030] Fig. 9 Schematic diagram of a small puzzle unit of an exemplary embodiment of the present invention.

[0031] Fig.10 2 is a schematic diagram of a high-altitude bulk plan view of an exemplary embodiment of the present invention.

[0032] Fig.11 It is a schematic diagram of the steel ladder structure of an exemplary embodiment of the present invention.

[0033] Fig.12 It is a schematic diagram of the connection between the first suspension rod and the lower chord rod according to an exemplary embodiment of the present invention.

[0034] Fig.13 It is a schematic diagram of the connection between the first suspension rod and the lower chord ball according to an exemplary embodiment of the present invention.

[0035] Fig.14 It is a schematic diagram of the installation of a steel structure horseway according to an exemplary embodiment of the present invention.

[0036] Fig.15 It is a schematic diagram of the plan structure of the first horseway of an exemplary embodiment of the present invention.

[0037] Fig.16 yes Fig.15 Side view of the first bridleway hoisting.

[0038] Fig.17 It is a schematic diagram of the structure of a winch bracket according to an exemplary embodiment of the present invention.

[0039] Fig.18 It is a structural schematic diagram of a winch bracket from another perspective of an exemplary embodiment of the present invention.

[0040] Fig.19 yes Fig.14 Schematic diagram of the structure of the second boom in the BB direction.

[0041] Fig. 20 yes Fig.19 Schematic diagram of the structure in the CC direction where the second suspension rod is connected to the ladder.

[0042] Fig.21 It is a schematic diagram of the connection between the first and second horse paths of an exemplary embodiment of the present invention.

[0043] Fig. 22 Schematic diagram of arrangement of the first and second horse paths from another perspective of an exemplary embodiment of the present invention.

[0044] Fig.23 It is a schematic diagram of the arrangement of the first suspension rod and the second suspension rod from another perspective of an exemplary embodiment of the present invention.

[0045] Fig.24 It is a schematic diagram of the block installation of the steel grid in the bulk area of ​​an exemplary embodiment of the present invention.

[0046] Markings in the figure: 1-first horseway, 101-arc beam, 102-cross beam, 103-pedal, 2-first suspension rod, 201-first vertical pole, 202-first horizontal rod, 3-operating platform, 4-hoisting device, 401-first winch, 402-second winch, 5-wall, 6-roof, 7-winch bracket, 8-pulley hook, 9-first safety rope, 10-second suspension rod, 10a-second vertical pole, 11-ladder, 11a-column, 12-connecting assembly, 121-clamping piece, 122-screw rod, 13-second safety rope, 14-second horseway, 15-first base, 16-second base, 17-wedge block, 18-support base plate, 19-rib plate, 20-support embedded parts, 21-lattice column, 22-temporary support. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments to make the purpose, technical solutions and advantages of the present invention more clearly understood. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] refer to Figure 1 The construction method of the steel structure grid according to the exemplary embodiment of the present invention comprises the following steps: Step A: Construction preparation; reference Figure 2 The roof frame structure (the wall structure around the venue) of the present invention is a rectangular structure. During the preparation process, on the outside of the roof frame structure, block assembly and hoisting areas are respectively set along the two short sides of the roof frame structure, a car crane is set on the first long side of the roof frame structure, and a car crane and a tower crane are set on the second long side of the roof frame structure (the first long side and the second long side are opposite); and a material stacking area is set at the corresponding position of the block assembly and hoisting area; the block assembly and hoisting area is a rectangular area, the length of which is consistent with the length of the short side of the roof frame structure, and the width is determined according to the construction requirements; in one embodiment, the length and width of the block assembly and hoisting area are 52*15m.

[0049] Step B, block assembly; determine the size of the block grid according to the structural form of the steel grid, its own stability and the capacity of the lifting equipment; in this embodiment, the process of dividing the block grid is: divide the block grid according to the short side length of the roof frame structure, the length of each block grid is consistent with the short side length of the roof frame structure, and the width of each block grid is determined according to the performance of the lifting equipment (crane). After each block grid is divided, the divided block grid is analyzed by finite element analysis software to obtain the stress of each rod in each block grid, and the block grid is adjusted according to the stress of each rod to avoid damage to each rod of the block grid during the lifting process.

[0050] The overall shape of the steel grid is a rectangular structure. The horizontal length of the steel grid is 55~60m and the vertical length is 45~50m. The edges of the steel grid are cantilevered 5~8m out of the roof frame structure. The steel grid is a right-placed quadrangular pyramid double-layer grid structure with bolt-ball nodes. The lower chord of the steel grid is supported at multiple points by the concrete structural columns of the roof frame structure.

[0051] In this embodiment, in combination with the positions of the fixed hinge supports on the two long sides of the roof frame structure and the lifting capacity of the crane, the steel grid is divided into a block grid 1, a block grid 2, a block grid 3 and a block grid 4. The length of each block grid is the same, which is 49.7m. The width of the block grid 1 and the block grid 3 is the same, which is 5.3m. The width of the block grid 2 and the block grid 4 is the same, which is 10.1m. The block area of ​​the steel grid is as follows: Figure 3 As shown, the block grid two and the block grid four are respectively arranged close to the two short sides of the roof frame structure, the block grid one and the block grid three are located between the block grid two and the block grid four, and the block grid one is arranged close to the block grid two.

[0052] Before block assembly, ensure the flatness of the ground in the block assembly and hoisting area, and make the ground bearing capacity meet the weight requirements of the block grid; block assembly is mainly carried out by tower crane to hoist the rods, and the area that cannot be covered by the partial tower crane is hoisted by car crane. Among them, block grid 1 and block grid 2 are assembled in the block assembly and hoisting area on one side of the roof frame structure, and block grid 3 and block grid 4 are assembled in the block assembly and hoisting area on the other side of the roof frame structure, so as to reduce the difficulty of subsequent hoisting of the block grid and improve the hoisting and installation efficiency.

[0053] refer to Figure 4 , the assembly process of the block grid includes: Step B1, set and level the platform support, which can be an I-beam platform support or a concrete platform support; according to the installation diagram, install the lower chord ball on the platform support, and set three rows and three columns of lower chord balls on the platform support respectively, and the three rows and three columns of lower chord balls form a regular quadrilateral structure with four small square grids; Step B2, connect the lower chord rods between adjacent lower chord balls; Step B3, connect the assembled triangular pyramid to the lower chord layer of the first grid, and the triangular pyramid is connected to three web rods by one upper chord ball. When connecting, connect the web rod of the triangular pyramid to the lower chord ball. Step B4: connect the upper chord and web of the second grid; Step B5: connect the web of the second grid, and connect the first grid and the second grid into a first basic unit; Step B6: connect the upper chord and web of the third grid; Step B7: connect the web of the third grid; Step B8: connect the upper chord and web of the fourth grid, connect the web of the fourth grid, and then connect the upper chord between the fourth grid and the first grid, and assemble the first grid to the fourth grid into a stable second basic unit; Step B9: repeat steps B1 to B8, expand the second basic unit horizontally and vertically, and expand the second basic unit into a block grid.

[0054] After the block grid is assembled, it is inspected and accepted to determine the accuracy of the installation size of the block grid, so as to ensure the node matching and reduce deviation during the high-altitude assembly; after all the block grids are assembled, all the block grids can be pre-assembled to control the size deviation and ensure the accuracy of the high-altitude assembly.

[0055] Step C: Install the fixed hinge support; refer to Figure 7The fixed hinge support includes a first base 15, which is an I-shaped structure, and an arc-shaped groove is arranged on the top of the first base 15. A wedge block 17 is arranged on the top of the first base 15, and the bottom surface of the wedge block 17 is an arc surface, and the shape of the arc surface is adapted to the shape of the arc-shaped groove of the first base 15. A second base 16 is also arranged on the top of the first base 15, and a clamping structure is arranged on the bottom of the second base 16. The cross section of the clamping structure is L-shaped. The top of the first base 15 and the wedge block 17 are clamped between the clamping structure, and the second base 1 The bottom surface of the second base 16 is in contact with the top surface of the wedge block 17; the top of the second base 16 is coaxially provided with a support base plate 18, which is connected to the second base 16 by welding, and the top of the support base plate 18 is provided with a plurality of ribs 19, which are circumferentially arranged on the support base plate 18, and the center of the circle formed by the plurality of ribs 19 is located on the central axis of the support base plate 18, and the bottom of each rib 19 is welded or integrally formed with the support base plate 18, and the top of the rib 19 is used to support and connect the bolt ball. The top of each rib 19 is also provided with an arc-shaped notch, and the shape of the arc-shaped notch is adapted to the shape of the bolt ball. The arc-shaped notch can prevent the bolt ball from slipping, improve the accuracy of the bolt ball positioning and installation, and thus reduce the installation deviation of the steel grid; the arc-shaped notch can also prevent the rib from contacting the bolt ball, thereby reducing the damage to the bolt ball. Under the action of the fixed hinge support, the torque generated by the steel grid can be released, so that the steel grid maintains the structural unity.

[0056] The installation process of the fixed hinge support includes: measuring and marking the support embedded parts 20 at the top of the two long sides of the roof frame structure, determining the center of the support embedded parts 20, embedding the support embedded parts 20 into the top of the long sides during the long side construction process, adjusting the position of the first base 15 of the fixed hinge support so that the center of the fixed hinge support coincides with the center of the support embedded part 20, and then welding the first base 15 to the embedded plate of the support embedded part 20.

[0057] Step D, block hoisting: Use 130t truck cranes on the two long sides of the roof frame structure to hoist the block grid. The order of hoisting the block grid is block grid one, block grid two, block grid three and block grid four. During hoisting, two truck cranes hoist the block grid one and block grid two to the preset position on the top of the roof frame structure on one short side of the roof frame structure, and then hoist the block grid three and block grid four to the preset position on the top of the roof frame structure on the other short side of the roof frame structure. When installing the block grid, pay attention to the positioning accuracy of the block grid one to ensure the positioning and installation accuracy of the subsequent block grids.

[0058] Before the block-by-block hoisting, the height of the scaffolding outside the roof frame structure shall be dismantled to be equal to the height of the fixed hinge support, and a lifeline (reference Figure 8, lifeline 1 is a steel wire rope with a diameter of 8mm), lifeline 1 is passed through the L75*8 angle steel at the top of the roof frame structure. The angle steel is pre-buried at the top of the roof frame structure during the construction of the roof frame structure. The angle steel is 1.2m high and has a mounting hole for passing the lifeline 1. Then, a steel pipe scaffolding vertical ladder (the top step of the vertical ladder is 1.8m high) and a ∅20 vertical hemp rope are set at one end of one of the block grids, so that the workers can enter the block grid structure through the scaffolding and vertical ladder outside the roof frame structure to install the block grid. When the workers go up and down the vertical ladder, their waist belts are connected with a fall arrester and a vertical hemp rope. During the block hoisting, the safety belts of the workers at the fixed hinge support and the upper command personnel are always kept hanging on the lifeline 1. Before the block hoisting, the block grid is pre-arched, and the arch value is not greater than 1 / 300 of the longitudinal span of the block grid.

[0059] Before the block hoisting, angle steel brackets are welded at the upper chord ball node of each block grid. Holes are reserved in the angle steel brackets, and lifeline 2 (using steel wire rope with a diameter of 8mm) is stretched along the longitudinal span direction of the block grid; for block grid 2 and block grid 4, lifeline 2 is set on the side where the two block grids are close to each other, and for block grid 1 and block grid 3, lifeline 2 is set on both sides of each block grid.

[0060] The specific process of block grid hoisting includes: Step D1: Connect the two ends of the grid to the truck crane along the length direction of the grid (refer to Figure 5 , Figure 6 ); Determine the positions of the hanging points at both ends of the block grid, and the hanging points at both ends of the block grid are on the same straight line; at each hanging point, use two steel wire ropes to tie four upper chord ball nodes, and then connect the two steel wire ropes to the truck crane; Step D2, test lifting to check the safety and reliability of the lifting equipment, the influence of the lifting point on the rigidity of the block grid, coordinate and command the lifting, cable wind rope and lifting equipment operation; synchronously control the two truck cranes, the truck cranes pre-tighten the wire ropes and then slowly lift them synchronously, and pause for a while after the block grid leaves the ground platform support to check whether the rods of the block grid are deformed by force. After confirming that the rods of the block grid are not deformed, the block grid is lifted synchronously. When the block grid is lifted to 300-500mm from the ground, pause for 20-30min to observe whether the rods and nodes of the block grid are deformed after being fully stressed or the node bolts are not tightened in place; Step D3, lifting and hoisting; command two truck cranes to synchronously lift the block grid until it is lifted to a position slightly higher than the bottom elevation of the fixed hinge support (the lifting height of the block grid is 3-8 cm higher than the height of the fixed hinge support); during the lifting process of the block grid, use a level to observe the balance of the block grid for about 5-10 minutes every time it is lifted by 2 m, and coordinate the lifting height of the two truck cranes at the same time, so that the balance deviation of the block grid is less than 5%; Step D4, translation into position; measuring the distance between the lower chord ball of the block grid and the corresponding fixed hinge support, and after clarifying the translation distance and direction of the block grid, the commander sends an overall synchronous translation signal, and the two truck cranes translate the block grid synchronously to the fixed hinge support. When the center of the lower chord ball of the block grid coincides with the center of the fixed hinge support, the two truck cranes are synchronously controlled to lower the height of the block grid until the lower chord ball of the block grid is in place at the center of the fixed hinge support; Step D5, fix the block grid; after the block grid is in place, the automobile crane maintains the hoisting state, adjusts the axis and elevation of the lower chord ball of the block grid, and after the axis and elevation meet the requirements, welds and fixes the rib plate of the fixed hinge support to the lower chord ball, and then releases the wire rope of the lifting point. When the second base of the fixed hinge support is separated from the support bottom plate, the lower chord ball can be welded and fixed to the rib plate during the splicing process of the block grid, or after aligning the axis of the support bottom plate and the second base, spot weld the support bottom plate on the top of the second base, and after the block grid is hoisted in place, weld and fix the lower chord ball to the rib plate; when this connection method is used, the installation deviation of the block grid can be adjusted to make the installation deviation of the block grid meet the requirements; after the overall installation of the steel grid is completed, the support bottom plate of the fixed hinge support is completely welded to the second base.

[0061] Step E: connecting blocks; installing steel grids in high altitude between adjacent grid blocks, the process includes: Step E1, assemble small units on the ground according to the high-altitude scattered assembly sequence and the grid rod numbers, and place the assembled small units in the order of numbers; the small units include upper chord small units, lower chord small units and edge small units, and the small units are centered on the upper chord ball (or lower chord ball) and connected to the upper chord rod (or lower chord rod) and the web rod.

[0062] The assembly method of the small assembly unit specifically includes: configuring the bolt balls and rods of the small assembly unit to be assembled, the first installer locates the ball hole of the bolt ball, aligns the ball hole with the web rod, and uses a wrench or pipe clamp to tighten the sleeve bolt; the second installer holds a chord rod (upper chord rod or lower chord rod) and aligns it with the ball hole of the bolt ball, the third installer aligns the bolt with the bolt ball hole corresponding to the chord rod, and uses a wrench or pipe clamp to tighten the chord rod into place. During the tightening process, the first installer shakes the chord rod to fully tighten the chord rod and the bolt ball into place. After tightening into place, install another chord rod. Reference Fig. 9The small puzzle unit can be a one-ball four-rod structure (two chords and two webs), a one-ball three-rod structure (two chords and one web), or a one-ball two-rod structure.

[0063] Step E2, use a tower crane to cooperate with high-altitude bulk workers to install the small assembly units; the weight of the small assembly unit is not more than 82.7kg, the tower crane uses a 6015 type tower crane, its rotation radius is 60m, and the maximum lifting weight at the end is 1.5t, which meets the requirements of high-altitude bulk of small assembly units.

[0064] refer to Fig.10 When installing small units, proceed in sequence along the long side of the roof frame structure, first install the small units of bulk area 1 (the area between block grids 3 and 4), then install the small units of bulk area 2 (the area between block grids 3 and 1), and finally install the small units of bulk area 3 (the area between block grids 1 and 2). At the beginning of each bulk area, first install the lower chord small units, then install the upper chord small units, and then repeat the installation of the lower chord small units and the upper chord small units along the horizontal and vertical directions of the bulk area until the grid assembly of the bulk area is completed.

[0065] The installation process of the small assembly unit includes: two installers are located at the lower chord node, and two installers are located at the upper chord node. After the tower crane hoists the small assembly unit into place, the installers respectively locate the bolt ball holes corresponding to the rods (web rods, upper chord rods or lower chord rods), tighten the bolts between the rods and the bolt balls into place, and then two installers install the lower chord rod and the lower chord ball.

[0066] During the installation of small units, when the installers move vertically or horizontally along the grid (block grid or loose grid), they use steel ladders; Fig.11 The steel ladder is welded with ribbed steel bars with a diameter of 20mm, with a length of 3m and a width of 0.5m. When moving vertically, the lap elbow of the steel ladder is fastened to the upper chord of the grid frame, and the installers go up and down the grid frame through the steel ladder; when moving horizontally for high-altitude bulk loading, four installers are set on the adjacent block grids, and the installers wear double-back safety belts, one of which is fixed to the rod or bolt ball of the block grid, and the other is hung on the lifeline 2. When a grid unit is installed, it moves horizontally along the grid chord through a horizontal steel ladder (the length of the horizontal steel ladder is determined according to the spacing of the block longitudinal horizontal rods). The horizontal steel ladder is set at the transverse rod close to the upper chord of the grid to facilitate the hanging of safety belts and fall arresters.

[0067] Before connecting adjacent grid blocks, double-hook safety belts are hung on the lifeline and rods of each grid block, and horizontal safety nets are set in the bulk area between adjacent grid blocks. The setting method of the horizontal safety net is as follows: lay the horizontal safety net on the ground corresponding to the bulk area, and then use ropes to lift the horizontal safety net to the position of the lower chord of the grid block at the adjacent grid block, and use ropes to tie the horizontal safety net to the lower chord of the grid block firmly. The distance between adjacent tying points is no more than 100cm. The setting area of ​​the horizontal safety net is as follows: Figure 8 shown.

[0068] Step F, support welding: Weld and fix the installed steel grid to the fixed hinge support.

[0069] Step G, inspection and acceptance; the inspection and acceptance contents include: using a theodolite and a steel ruler to inspect the positioning axis of the steel grid and the fixed hinge support, and the elevation of the fixed hinge support, wherein the allowable deviation of the positioning axis of the steel grid is L / 20000 (L is the longitudinal length of the steel grid), and is not greater than 3.0 mm; the allowable deviation of the positioning axis of the fixed hinge support is not greater than 1.0 mm, and the allowable deviation of the bottom elevation of the fixed hinge support is ±3.0 mm; using a steel ruler, a level or a total station to measure the deflection value of the steel grid, and the measured deflection value is not greater than 1.15 times the deflection value under the corresponding load conditions. When measuring the deflection value, for steel grids with a span of no more than 24m, measure the center point of the lower chord, and for steel grids with a span of more than 24m, measure the center point of the lower chord and the quarter-division points of the horizontal and longitudinal spans of the lower chord; use a wrench, a feeler gauge and observation to check the connection position of high-strength bolts and bolt ball nodes to prevent gaps, looseness and other untightened phenomena.

[0070] In the above step E, when connecting blocks, the blocks can also be hoisted and installed between adjacent blocks. The block division method of each block is the same as the block division method in step B. In each bulk area, the width of each bulk area and the performance of the crane determine the number of blocks and the width of each block, and the length of each block is the same as the short side length of the roof frame structure.

[0071] In each bulk area, refer to Fig.24The process of block installation includes: on the inner side of the roof frame structure, lattice columns 21 are respectively set near the two long sides of the roof frame structure, and a temporary support 22 is set at the top center of the lattice column 21. The temporary support is set at the same height as the fixed hinge support. The temporary support 22 can have the same structure as the fixed hinge support, or can use a sand box, jack or other support; for each long side, the number of lattice columns 21 and the interval between adjacent lattice columns 21 correspond to the number and interval of the block grid in the bulk area. The lattice column 21 is connected in a segmented assembly manner, and the adjacent segments can be detachably connected to facilitate the lattice column 21 to be circulated in other bulk areas; under the support of the lattice column and the temporary support, the block grid can also be hoisted in the bulk area, reducing the number of rods assembled in the bulk area and improving the overall installation efficiency and safety of the steel grid. After the lattice column 21 is set, the block grid is hoisted to a position higher than the installed block grid in the same manner as steps D1 to D3, and then the block grid is translated to the position of the lattice column 21 in the same manner as step D4, so that the lower chord ball of the block grid is in place at the center of the temporary support 22, and the lattice column 21 and the temporary support 22 temporarily support the block grid; then the lower chord ball of the block grid is fixed in the same manner as step D5, and the wire rope of the lifting point is released; when multiple block grids are installed in the bulk area, they are installed sequentially along the long side direction of the roof frame; after all the block grids are hoisted in place, the adjacent block grids are connected and fixed.

[0072] When there are multiple bulk areas in the long side direction of the roof frame, the block grid is installed in each bulk area in sequence from the starting section to the end section of the long side; after the installation of the block grid of the first bulk area is completed, the lattice column 21 of the first bulk area is removed, and then the block grid of the next bulk area is installed in the same way as the first bulk area, until the installation of the block grid of all bulk areas is completed.

[0073] In the process of assembling the block grid one, block grid two, block grid three and block grid four in the above step B, the first suspension rod is installed at the preset position of each block grid according to the design position of the steel structure horseway on the steel grid. During the installation process, for each block grid, two groups of first suspension rods are installed close to both sides of the block grid in the length direction of the block grid. When the block grid is subsequently hoisted, the first suspension rod can be hoisted together with the block grid. Similarly, when hoisting the block in the bulk area, in the above step E, for each block grid in the bulk area, the first suspension rod is installed at the preset position of each block grid according to the design position of the steel structure horseway on the steel grid.

[0074] Take the first block grid as an example (the installation method of the first hanger on other block grids is the same as that on the first block grid). When the first hanger is connected to the first block grid, the first hanger can be connected to the lower chord of the first block grid. Fig.12 The first hanger 2 includes two first vertical poles 201 parallel to each other, a first cross bar 202 is arranged between the two first vertical poles 201, the first cross bar 202 and the first vertical poles 201 are perpendicular to each other, both ends of the first cross bar 202 are respectively connected to the first vertical poles 201, and the first cross bar 202 is arranged close to the top of the first vertical pole 201; when the first hanger 2 is connected to the lower chord, the top of each first vertical pole 201 is welded or bolted to the lower chord. The first hanger 2 can also be connected to the lower chord ball of the block grid. When the first hanger 2 is connected to the lower chord ball, two parallel first cross bars 202 are arranged between the two first vertical bars 201, and the two ends of each first cross bar 202 are respectively connected to the first vertical bars 201; the first cross bar 201 is located above the second first cross bar 202, and the top of the first first cross bar 202 is provided with a connecting rod 203 which is perpendicular to the first first cross bar 202, the bottom of the connecting rod 203 is welded or bolted to the first first cross bar 201, and the top of the connecting rod 203 is welded or bolted to the lower chord ball; more first cross bars can be arranged between the first first cross bar 202 and the second first cross bar 202 to improve the stability of the first hanger structure.

[0075] Before installing the first suspension rod 2, a pulley hook 8 is installed on the first crossbar 202. The pulley hook 8 is fixed to the first crossbar 202 through a steel wire rope and a steel wire rope clamp. When the first suspension rod 2 includes multiple first crossbars 202, the pulley hook 8 is installed on the lowest first crossbar 202. During application, the first vertical rod 201 is made of H-shaped steel, rectangular tube or round rod, the first crossbar 202 is made of H-shaped steel or rectangular tube or round rod, the steel wire rope connected to the pulley hook 8 is a steel wire rope with a diameter of 14-20mm, the dead weight of the pulley hook 8 is 4.3kg, the maximum load is 5t, and the distance between the two first vertical rods 201 is 600mm.

[0076] Similarly, when assembling small units, the first suspension rod is installed at the preset position of the corresponding small unit, so that the first suspension rod is hoisted and installed together with the small unit. After the block grid and the connection between blocks are completed, the first suspension rod is installed together, which is conducive to reducing the risk of high-altitude operations and improving the construction efficiency of subsequent horseways.

[0077] The first suspension rod 2 can also be hoisted to the preset position for installation after the overall construction of the steel grid is completed. Fig.14The installation method includes: installing the first hanger 2 through the operating platform 3 on the inner side of the roof frame structure, the operating platform 3 is a scaffolding platform, the height of which is 14m, the vertical distance of the vertical poles is 0.9m, the horizontal distance is 0.9m, and the step distance is 1.5m. The distance between the vertical poles on the inner side of the operating platform 3 and the wall columns of the wall 5 is 0.3~0.5m, and the distance between the top of the operating platform 3 and the bottom of the roof 6 (the lower chord of the steel grid) is 0.4m~0.8m; when installing the first hanger 2, the tops of the two groups of first hangers 2 are respectively connected to the two sides of the lower chord of the steel grid at the top of the operating platform 3, the two groups of first hangers 2 are respectively arranged close to the inner side of the roof frame structure, and the first hanger 2 is connected to the lower chord ball or the lower chord rod.

[0078] After the first hanger 2 is installed, the method further includes step H, assembling the steel structure bridleway; transporting the components of the assembled steel structure bridleway to the bridleway installation position in the roof frame, assembling the arc bridleway on the ground, and then breaking the arc bridleway at the preset positions at both ends to form a first bridleway 1 (reference Fig.15 ) and two sections of the second horseway 14; or the first horseway 1 and the second horseway 14 are assembled separately; the weight of the first horseway 1 is 1.43~2t and the length is 19.2~26m; the weight of the second horseway is 0.22~0.6t and the length is 2~5m.

[0079] refer to Fig.15 , Fig.16 The first horseway 1 is an integral curved horseway, including two concentrically arranged curved beams 101, a plurality of cross beams 102 are circumferentially arranged between the two curved beams 101, and the two ends of each cross beam 102 are respectively connected to the curved beam 101, and a pedal 103 is arranged on the top of the cross beam 102, and the two ends of the pedal 103 extend to the two curved beams 101 respectively. Guardrails (not shown in the figure) are also arranged at both ends of the pedal 103, and the guardrails are used to improve the safety of the installers working on the first horseway. The curved beam 101 and the cross beam 102 are both made of H-shaped steel, and the pedal 103 is made of patterned steel plate. The second horseway 14 is a straight horseway, and except for the shape, the structure of the second horseway 14 is the same as that of the first horseway 1.

[0080] Step I, set up the horseway hoisting device 4; arrange two first winches 401 on the ground, and the two first winches 401 are respectively arranged at the two ends of the first horseway 1, and the length of the wire rope of each first winch 1 is not less than 50m; then fix the second winch 402 on the top of the steel grid, and the second winch 402 is correspondingly arranged in the middle of the first horseway 1; when fixing the second winch 402, a winch support plate can be set on the top of the steel grid, and the winch support plate can be detachably installed on the steel grid, and then the second winch 402 is installed on the winch support plate to ensure the stability of the installation of the second winch 402; then open a mounting hole with a diameter of 50mm on the winch support plate (the center of the mounting hole corresponds to the central axis of the first horseway 1), and set a winch bracket 7 at the mounting hole, and the winch bracket 7 is fixed to the winch support plate by post-bolts, refer to Fig.17 , Fig.18 The hoist bracket 7 includes two support brackets arranged opposite to each other, and the cross section of the support bracket is a triangular structure. The tops of the two support brackets are connected by a connecting crossbeam, and the bottoms of the support brackets are fixed to the hoist support plate by rear bolts. The connecting crossbeam is also provided with a pulley hook. The steel wire rope of the second hoist 402 passes through the steel ring of the hoist bracket 7, the pulley hook and the mounting hole on the hoist support plate, and then extends into the roof frame. During the application process, the second hoist 402 can be replaced by a car crane or a tower crane for hoisting small assembly units.

[0081] Step J, after connecting the hoisting device 4 to the first horseway 1, hoist the first horseway 1; determine the positions of the hoisting points at both ends and the middle of the first horseway 1, and four hoisting points are set at each hoisting point. At each hoisting point, a hoisting rope (a steel wire rope with a diameter of 14 mm) is used to be sleeved on the four hoisting points of the first horseway 1, and then the hoisting ropes at both ends of the first horseway 1 are connected to the steel wire rope of the first hoist 401 (the steel wire rope of the first hoist is connected to the hoisting rope after passing through the pulley hook on the corresponding first suspension rod), and the hoisting rope in the middle of the first horseway 1 is connected to the steel wire rope of the second hoist 402. After the connection is completed, the first hoist 401 and the second hoist 402 are synchronously controlled by the remote control electric box to hoist the first horseway 1. During the hoisting process of the first horseway 1, the angle between the hoisting rope and the first horseway 1 is 75 degrees, and the distance between the top of the hoisting rope and the first horseway 1 is 1m.

[0082] After the first horseway 1 is hoisted in place, the two ends of the first horseway 1 are welded to the bottom of the first upright pole 201 of the first hoisting rod 2 respectively. After welding, the connection state between the hoisting device 4 and the first horseway 1 is maintained to keep the first horseway 1 in a hoisted state.

[0083] Step K: Arrange two first safety ropes 9 along the height direction of the first suspension rod 2 (reference Fig.14), two first safety ropes 9 are respectively arranged near the top and bottom of the first hanger 2, and the two ends of each first safety rope 9 are respectively connected to the safety rope embedded parts on the wall 5; then a second safety rope 13 is arranged near the middle of the first horseway 1, and the second safety rope 13 extends vertically from the steel grid into the roof frame, and the top of the second safety rope 13 is fixed on the winch support plate or the roof 6 (steel grid).

[0084] Step L: Use the second suspension rod 10 to connect the first bridleway 1 and the steel grid; Fig.19 The second suspension rod 10 includes two second vertical poles 10a parallel to each other, a ladder 11 is arranged between the two second vertical poles 10a, the ladder 11 is arranged along the height direction of the second vertical pole 10a, and the vertical poles 11a at both ends of the ladder 11 are detachably connected to the second vertical pole 10a through connecting components 12, and multiple connecting components 12 are arranged along the height direction of the vertical poles 11a. After the first horseway 1 is hoisted in place, the second suspension rod 10 can be connected to the steel grid through the ladder 11 on the second suspension rod 10, thereby improving the anti-deformation ability of the first horseway 1.

[0085] refer to Fig. 20 The connecting component 12 includes two clamping members 121 arranged opposite to each other. The second vertical pole 10a and the column 11a are arranged in close contact. The second vertical pole 10a and the column 11a are located between the two clamping members 121. Both ends of each clamping member 121 are respectively provided with connecting through holes. The two ends of the two clamping members 121 are respectively connected by screw rods 122 and nuts. When connected, both ends of each screw rod 122 pass through the connecting through holes of the two clamping members 121 at the same time, and the two ends of the screw rod 122 are respectively connected to the clamping members 121 by nuts, thereby fastening the second vertical pole 10a and the column 11a together. During application, the ladder 11 is made of 30*3 square tube, the clamp 121 is made of L50*4 angle steel, the screw rod 122 is made of M12 screw rod 122, the second vertical pole 10a is made of HN100*100 steel, the length of the second suspension rod 10 is 4~5m, and the length of the second suspension rod 10 is the same as the length of the first suspension rod 2.

[0086] After the second hanger 10 is hoisted to the middle of the first horseway 1, the bottom of the second vertical pole 10a of the second hanger 10 is welded to the first horseway 1, and then the second hanger 10 is climbed onto the ladder 11 on the second hanger 10, and the top of the second vertical pole 10a is welded to the lower chord or lower chord ball of the steel grid. After the connection of the second hanger 10 is completed, the first horseway 1 is disconnected from the hoisting device 4.

[0087] When the installer climbs up and down the ladder 11, the safety belt of the installer is connected to the second safety rope 13 by a clamp to ensure the safety of the installer. When hoisting the second suspension rod 10, the fourth hoist or electric hoist can be used, that is, after the hoist bracket is arranged at the preset position on the hoist support plate at the top of the steel grid, the steel wire rope of the fourth hoist is passed around the hoist bracket (or the electric hoist is hung on the hoist bracket) and the mounting hole on the hoist bracket to hoist the second suspension rod 10. The hoisting of the second suspension rod 10 can also be carried out indoors by a crane, and can also be carried out outdoors by a tower crane or a car crane. The second suspension rod 10 can also be welded to the middle part of the first horseway 1 during the process of assembling the first horseway 1. When connected in this way, the step of hoisting the second suspension rod 10 separately can be omitted, and the installation efficiency is improved. After the first horseway 1 is connected to the first suspension rod 2, only the top of the second suspension rod 10 needs to be connected to the steel grid. After the second suspension rod 10 is installed, the ladder 11 on the second suspension rod 10 can be removed so that the ladder 11 can be used at other second suspension rods, which is beneficial to saving materials and reducing construction costs.

[0088] When all the steel structure galleries are installed in the roof frame, repeat steps H to L along the long side direction of the roof frame to install the first galleries 1 in sequence until all the first galleries 1 are installed.

[0089] After all the first horseways are installed, the second horseway 14 is installed. The installation process of the second horseway 14 includes: lowering the height of the operating platform 3 by removing the steel pipe of the operating platform 3, and the height of the operating platform 3 is lowered to be slightly lower than the installation height of the first horseway 1 (for example, the height of the operating platform is 0.4m lower than the installation height of the first horseway); adjusting the positions of the two first winches 401 in the roof frame so that the two first winches 401 correspond to the two ends of the first section of the first horseway 1 respectively (along the long side direction of the roof frame structure, the first horseway close to the starting section is the first section of the first horseway); the two first winches 40 1 are respectively passed over the pulley hook 8 on the first suspension rod 2, and after being connected with the second horseway 14, the two sections of the second horseway 14 are simultaneously hoisted to the same height as the first horseway 1; after adjusting the position of the second horseway 14 so that the second horseway 14 is aligned with the first horseway 1, one end of the second horseway 14 is respectively welded or bolted to the first horseway 1 on the operating platform 3, and the other end of the second horseway 14 is welded or bolted to the horseway embedded part on the wall 5; after the second horseway 14 is connected to the first section of the first horseway 1, the above steps are repeated to install the second horseway 14 along the long side direction of the roof frame until all the second horseways 14 are installed (refer to Figures 21 to 23 ). The second bridle 14 can also be hoisted by an indoor or outdoor truck crane or tower crane.

[0090] When the first and second horseway 1 and 14 are installed, in order to further improve the stability and reliability of the horseway structure, multiple auxiliary hangers can be installed in the length direction of the first horseway 1. The auxiliary hangers have the same structure as the second hangers 10. The auxiliary hangers can be installed in the same way as the second hangers 10, or they can be installed using a fixed or mobile scaffolding platform.

[0091] In the aforementioned steps, during the process of assembling block grid one, block grid two, block grid three and block grid four, after installing the first hanger on each block grid, the first horseway can also be connected to the first hanger on the block grid, and in the middle of the first horseway, the second hanger is used to connect the block grid; thus, when hoisting the block grid, the first hanger, the second hanger and the first horseway are hoisted together with the block grid, thereby improving the installation efficiency of the steel grid and the horseway and reducing the installation risk; for the horseway between adjacent block grids, after the steel grid is inspected and accepted, it is installed in the same manner as the aforementioned steps I to L.

[0092] The above is only a detailed description of the specific implementation of the present invention, rather than a limitation of the present invention. Various substitutions, modifications and improvements made by those skilled in the relevant art without departing from the principle and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for a steel structure grid, characterized in that: The following steps are involved: Step A, construction preparation: on the outside of the roof frame structure, block assembly and hoisting areas are respectively set along the two short sides of the roof frame structure, a truck crane is set on the first long side of the roof frame structure, a truck crane and a tower crane are set on the second long side of the roof frame structure, and a material stacking area is set at the corresponding position of the block assembly and hoisting area; Step B, assembling in blocks; Determine the size of the block grid, divide the steel grid into multiple block grids according to the adjacent support nodes of the steel grid installation, and use tower cranes to assemble the block grids in the block assembly and hoisting area; Step C, installation of fixed hinge support: installing the fixed hinge support on the top of the concrete structural column of the roof frame structure, and connecting the fixed hinge support with the support embedded part; Step D, block hoisting: using the automobile cranes on the two long sides of the roof frame structure to cooperate with the hoisting of the block grid, and hoisting the multiple block grids to the preset positions on the top of the roof frame structure for installation; Step E, connecting blocks; performing high-altitude loose assembly or block hoisting of steel grids in the bulk area between adjacent block grids; Step F, support welding: welding the block grid to the fixed hinge support; Step G, testing and verification; It includes axis deviation detection of steel grid and fixed hinge support, elevation deviation detection of fixed hinge support, deflection detection of steel grid, connection detection of high-strength bolts and bolt ball nodes.

2. The construction method of the steel structure grid according to claim 1, characterized in that: The overall shape of the steel grid is a rectangular structure, and the edges of the steel grid are cantilevered 5 to 8 meters from the roof frame structure; the steel grid is a right-placed quadrangular pyramid double-layer grid structure, and its node form is a bolt ball node, and the lower chord of the steel grid is supported at multiple points by the concrete structural columns of the roof frame structure; the steel grid is divided into block grid one, block grid two, block grid three and block grid four; block grid two and block grid four are respectively arranged close to the two short sides of the roof frame structure, the block grid one and block grid three are located between the block grid two and the block grid four, and the block grid one is arranged close to the block grid two.

3. The construction method of the steel structure grid according to claim 2, characterized in that: The block grid 1 and the block grid 2 are assembled in blocks and hoisting areas on one side of the roof frame structure, and the block grid 3 and the block grid 4 are assembled in blocks and hoisting areas on the other side of the roof frame structure; When hoisting the segmented grid in the step D, 130t truck cranes on the two long sides of the roof frame structure are used for hoisting, and the sequence of hoisting the segmented grid is the sequence of segmented grid one, segmented grid two, segmented grid three and segmented grid four; during the hoisting process, two truck cranes hoist the segmented grid one and segmented grid two to the preset positions on the top of the roof frame structure on one short side of the roof frame structure, and then hoist the segmented grid three and segmented grid four to the preset positions on the top of the roof frame structure on the other short side of the roof frame structure.

4. The construction method of the steel structure grid according to claim 3 is characterized in that: The specific process of hoisting each block grid includes: Step D1, connecting the two ends of the block grid to the truck crane respectively; determining the positions of the hanging points at both ends of the block grid, using two steel wire ropes to tie four upper chord ball nodes at the hanging points at each end, and then connecting the two steel wire ropes to the truck crane; Step D2, trial lifting; synchronously control two mobile cranes, the mobile cranes pre-tighten the wire ropes and then slowly lift synchronously, pause for a while after the block grid leaves the ground platform support, and check whether the rods of the block grid are deformed by force; after confirming that the rods of the block grid are not deformed, synchronously lift the block grid, and when the block grid is lifted to 300-500mm from the ground, pause for 20-30min to observe whether the rods and nodes of the block grid are deformed after being fully stressed or whether the node bolts are not tightened in place; Step D3, lifting and hoisting; command two truck cranes to synchronously lift the block grid until it is lifted to a height higher than the bottom elevation of the fixed hinge support; during the lifting process, use a level to observe the balance of the block grid for 5 to 10 minutes every 2 meters of lifting, and coordinate the lifting heights of the two truck cranes at the same time, so that the balance deviation of the block grid is less than 5%; Step D4, translation into position; measuring the distance between the lower chord ball of the block grid and the corresponding fixed hinge support, and after clarifying the translation distance and direction of the block grid, the commander sends an overall synchronous translation signal, and the two truck cranes translate the block grid synchronously to the fixed hinge support; when the center of the lower chord ball of the block grid coincides with the center of the fixed hinge support, the two truck cranes are synchronously controlled to lower the height of the block grid until the lower chord ball of the block grid is in place at the center of the fixed hinge support; Step D5, fix the block grid; keep the mobile crane in the hoisting state, adjust the axis and elevation of the lower chord ball of the block grid, fix the fixed hinge support and the lower chord ball, and then release the wire rope of the lifting point.

5. The construction method of the steel structure grid according to claim 3, characterized in that: Before the block hoisting in step D, the height of the scaffolding outside the roof frame structure is dismantled to be equal to the height of the fixed hinge support, and a lifeline 1 is set circumferentially on the roof frame structure beam, and the lifeline 1 is passed through the L75*8 angle steel on the top of the roof frame structure beam. A steel pipe scaffolding vertical ladder and a ∅20 vertical hemp rope are set at one end of one of the block grids; then, an angle steel bracket is welded at the upper chord ball node of each block grid, and a lifeline 2 is stretched along the longitudinal span direction of the block grid.

6. The construction method of the steel structure grid according to claim 1, characterized in that: The step E comprises: step E1, assembling small units on the ground according to the high-altitude scattered assembly sequence and the grid rod numbering, and placing the assembled small units in the order of numbering; step E2, using a tower crane to cooperate with high-altitude scattered personnel to install the small units; in the step B, when assembling the block grid, the first suspension rod is respectively installed at the preset positions on both sides of the length direction of each block grid; in the step E, when assembling the small units, according to the design drawings of the horseway and the steel grid, the first suspension rod is installed at the preset position of the corresponding small unit; or after the overall installation of the steel grid is completed, the first suspension rod is installed at the preset position on the steel grid; the first suspension rod is connected to the lower chord ball or lower chord rod of the steel grid.

7. The construction method of the steel structure grid according to claim 4, characterized in that: The process of performing block hoisting in the bulk area between adjacent block grids in step E includes: The block grid is installed in each bulk area from the starting section to the end section of the long side of the roof frame structure; the installation process of the block grid of the first bulk area includes: On the inner side of the roof frame structure, lattice columns are respectively arranged near the two long sides of the roof frame structure, and a temporary support is arranged at the top center of the lattice column, and the setting height of the temporary support is the same as that of the fixed hinge support; Hoist the block grid to a level higher than the installed block grid in the same manner as steps D1 to D3; In the same manner as step D4, the block grid is translated to the position of the lattice column, so that the lower chord ball of the block grid is positioned at the center of the temporary support, and the lattice column and the temporary support temporarily support the block grid; In the same manner as step D5, fix the lower chord ball of the block grid and release the wire rope at the hanging point; After all the installed block grids between adjacent block grids are hoisted in place, the adjacent block grids are connected and fixed; The lattice columns of the first bulk area are removed, and the block grids of the next bulk area are installed in the same manner as the first bulk area until the block grids of all bulk areas are installed.

8. The construction method of the steel structure grid according to claim 6, characterized in that: After the first hanger is installed, the method also includes step H, assembling a steel structure horseway in the roof frame; step I, setting a horseway hoisting device; step J, after connecting the hoisting device to the first horseway, hoisting the first horseway, connecting the first horseway to the first hanger, and keeping the hoisting device and the first horseway connected; step K, arranging two first safety ropes respectively along the height direction of the first hanger, and setting a second safety rope near the middle of the first horseway; step L, using the second hanger to connect the first horseway and the steel grid.

9. The construction method of the steel structure grid according to claim 8, characterized in that: After the first horseway is installed, second horseways are installed at both ends of the first horseway, one end of the second horseway is connected to the first horseway, and the other end of the second horseway is connected to the horseway embedded part on the wall.

10. The construction method of the steel structure grid according to claim 5, characterized in that: Before the construction of step E, a double-hook safety belt is hung on the lifeline 2 and the rod of each block grid, and a horizontal safety net is set in the bulk area between adjacent block grids; The method for setting up the horizontal safety net includes: laying the horizontal safety net flat on the ground corresponding to the bulk area, and then using ropes to lift the horizontal safety net to the position of the lower chord of the block grid at the adjacent block grid, and using binding ropes to firmly bind the horizontal safety net and the lower chord of the block grid, and the spacing between adjacent binding points is not more than 100cm.

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