Fabricated steel structure roof and assembly construction method thereof

Abstract

This invention discloses a prefabricated steel structure roof, comprising a concrete foundation composed of several columns and circular ring beams, and a steel structure roof body detachably connected to the concrete foundation. The steel structure roof body includes an inner ring located in the middle, several edge main beams evenly distributed around the outer periphery of the inner ring, several arc-shaped main beams detachably disposed between two edge main beams, edge secondary beams detachably connected at both ends to the arc-shaped main beams and the concrete foundation respectively, and several arc-shaped secondary beams detachably disposed between the edge secondary beams and the edge main beams. Several outward beams, the same number as the edge main beams, are evenly fixed outside the inner ring, and the length of the outward beams is shorter than the length of the edge main beams. The two ends of the edge main beams are connected to the outward beams of the inner ring and the concrete foundation respectively. A groove is provided on the inner side of the top of the concrete foundation to accommodate the edge main beams and edge secondary beams.

Description

Technical Field

[0001] This invention relates to the field of foundation pit pile anchor support, specifically to a prefabricated steel structure roof and its assembly construction method. Background Technology

[0002] Currently, many large-scale public building projects often encounter buildings with unique shapes and hollow interiors. These hollow spaces are large and open, and considering the large span of the roof structure and lighting requirements, they are generally designed as steel-structured glass roofs. While these steel roof structures have simple shapes, their location at the top of the building, the large height and area of ​​the hollow roof, and the weight of the steel components themselves make installation extremely difficult. During the installation of such steel roof structures, large lifting equipment cannot enter the interior for hoisting. Using an indoor tower crane would present a challenge in terms of dismantling. Common construction methods for large-span steel structures, such as integral lifting (jacking), integral hoisting, and sliding construction, are unsuitable for this project. While full-span scaffolding, segmented hoisting, and high-altitude assembly methods are applicable, lifting the entire steel structure is difficult, requiring a large amount of reusable materials, and resulting in a long overall construction period. Tall, prefabricated steel structure roofs have been widely used in large-scale public building projects. However, existing construction methods for tall roof steel structures suffer from problems such as the large weight of the steel components, difficulties in lifting, large input of turnover materials, long construction periods, and high costs associated with installation and maintenance. Therefore, designing a tall roof steel structure with a simple structure, convenient installation and maintenance, low input of turnover materials, and short construction period, as well as its assembly construction method, is of significant practical importance. Summary of the Invention

[0003] The purpose of this invention is to address the problems of existing prefabricated steel structure roof construction, such as the large weight of steel components, difficulty in lifting, large amount of turnover materials, long construction period, and high cost of installation and maintenance. The invention provides a prefabricated steel structure roof and its assembly construction method that is simple in structure, convenient in installation and maintenance, requires less turnover materials, and has a short construction period.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated steel structure roof, comprising a concrete foundation composed of several columns and circular ring beams, and a steel structure roof body detachably connected to the concrete foundation; the steel structure roof body includes an inner ring located in the middle, several edge main beams evenly distributed around the outer periphery of the inner ring, several arc-shaped main beams detachably disposed between two edge main beams, edge secondary beams detachably connected at both ends to the arc-shaped main beams and the concrete foundation respectively, and several arc-shaped secondary beams detachably disposed between the edge secondary beams and the edge main beams; several outward beams, the same number as the edge main beams, are evenly fixed outside the inner ring, and the length of the outward beams is shorter than the length of the edge main beams; both ends of the edge main beams are connected to the outward beams of the inner ring and the concrete foundation respectively; a groove for accommodating the edge main beams and edge secondary beams is provided on the inner side of the top of the concrete foundation.

[0005] Preferably, the inner ring is provided with a cross beam to enhance the structural strength and rigidity; each of the upper ends of the cross beam arm is provided with eye bolts symmetrically distributed along the width direction; the eye bolts are U-shaped.

[0006] Preferably, the main body of the outer beam, edge main beam, arc-shaped main beam, edge secondary beam, and arc-shaped secondary beam of the inner ring are all I-beams.

[0007] Preferably, the inner ring and the edge main beam, the edge main beam and the arc-shaped main beam, the edge main beam and the edge secondary beam, the arc-shaped main beam and the edge secondary beam, and the arc-shaped secondary beam and the edge secondary beam are all connected by the same thread, and the web plates of the connected I-beams are connected by mounting plates, high-strength bolts, washers and nuts.

[0008] Preferably, the through holes on the longitudinal plate at the connection between the two ends of the arc-shaped main beam and the adjacent edge main beam, and on the mounting plate at the connection between the middle outward beam of the arc-shaped main beam and the edge secondary beam, are distributed in 9 rows and 2 columns, and the diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolts.

[0009] Preferably, the through holes on the longitudinal plates at the connection points of the edge main beam and the inner ring outward beam, the connection points of the edge main beam and the arc-shaped main beam, and the connection points of the edge main beam and the arc-shaped secondary beam are arranged in 9 rows and 2 columns. The through holes on the bottom plate at the connection point of the edge main beam and the concrete foundation are arranged in 4 rows and 4 columns. 4 rows and 2 columns are set on both sides along the width direction of the edge main beam. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolts. There are 8 arc-shaped main beams. The through holes on the longitudinal plates at the connection points of the arc-shaped main beams at both ends and the adjacent edge main beams, and at the connection points of the middle outward beam of the arc-shaped main beam and the edge secondary beams are all arranged in 9 rows and 2 columns. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolts.

[0010] Preferably, the number of curved main beams is 8; the number of edge main beams is 8; the number of edge secondary beams is 8; and the number of curved secondary beams is 16.

[0011] Preferably, a pre-embedded steel plate is provided at the connection between the groove of the concrete foundation and the edge main beam and the edge secondary beam.

[0012] Preferably, the embedded steel plate is provided with through holes that are distributed in the same way as those at the connection between the edge main beam and the concrete foundation; the upper ends of several embedded bolts are provided with threads and extend above the embedded steel plate; and hooks are provided at the bottom to fix them in the concrete foundation.

[0013] A method for assembling and constructing a prefabricated steel structure roof, comprising the following steps:

[0014] S1. Pull the inner ring as a whole component to the center of the ground floor of the central hall, and at the same time transport the edge secondary beam, the arc-shaped main beam, the edge main beam, and the arc-shaped secondary beam to the main structure waiting area for hoisting;

[0015] S2. Erect a lattice column support within the inner ring integral component, symmetrically install four hand-operated hoists on the crossbeam at the top of the support, and install lifting eye bolts on the inner ring integral component;

[0016] S3. Using four symmetrical hand-operated hoists at the top of the lattice column support, pull the entire inner ring component to the predetermined height and temporarily fix it with welded brackets;

[0017] S4. Install a mast crane on the lattice column support. The mast crane is supported by a single rod, and the lifting point of the mast crane is set near the center of the edge main beam installation.

[0018] S5. First, hoist and temporarily fix the four edge main beams to control the overall installation size deviation of the roof system, and then install the other four edge main beams in the same way.

[0019] S6. Align the positions of the 8 installed edge main beams and tighten them with high-strength bolts after confirmation.

[0020] S7. Hoist the remaining curved main beams, edge secondary beams, and curved secondary beams into place and assemble them with high-strength bolts.

[0021] S8. Remove the lower lattice column support.

[0022] The present invention has the following beneficial effects:

[0023] 1. Compared with existing prefabricated steel structure roofs, it is lighter in weight and has smaller component cross-sections. It uses I-beams as the main steel structure, which reduces the pollution caused by waste to the environment. The materials are green and recyclable building materials, which meet the requirements of ecological and environmental protection and are in line with the current environmental protection situation.

[0024] 2. This prefabricated steel structure roof adopts factory prefabrication and on-site assembly, which improves the assembly accuracy and welding quality of components and prevents common quality defects in on-site steel component welding.

[0025] 3. This prefabricated steel structure roof has a short construction period, is easy to install and maintain, and has low cost.

[0026] 4. The assembly and construction method of prefabricated steel structure roofs is simple, the installation of lifting equipment is simple, the amount of turnover materials required is small, and they can be reused multiple times.

[0027] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall assembly of the prefabricated steel structure roof of the present invention;

[0029] Figure 2 This is a schematic diagram of the steel structure roof body of the present invention;

[0030] Figure 3 This is a schematic diagram of the assembly of the inner ring and the edge main beam of the present invention;

[0031] Figure 4 This is a schematic diagram showing the connection between the edge main beam and the cantilever beam of the present invention;

[0032] Figure 5 This is a schematic diagram of the assembly of the edge main beam, edge secondary beam, arc-shaped main beam, and arc-shaped secondary beam of the present invention;

[0033] Figure 6 This is a schematic diagram of the installation of the edge main beam and the concrete foundation of the present invention;

[0034] Figure 7 This is a schematic diagram of the installation of the edge main beam and the concrete foundation of the present invention;

[0035] Figure 8 This is a schematic diagram of the installation of the eye bolt and inner ring of the present invention;

[0036] Figure 9 This is a schematic diagram of the inner circle of the lattice column support hoisting system of the present invention.

[0037] In the diagram, 1. Concrete foundation; 2. Edge secondary beam; 3. Curved main beam; 4. Edge main beam; 5. Curved secondary beam; 6. Inner ring; 7. Eye bolt; 8. Eye washer; 9. Eye nut; 10. Nut; 11. Mounting plate; 12. High-strength bolt; 13. Washer; 14. Embedded steel plate; 15. Embedded bolt; 16. Crossbeam; 17. Hand chain hoist; 18. Lattice column; 19. Corbel; 20. Base plate; 21. Base plate bolt. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0040] Please see Figure 1-9 ;

[0041] 1. To reduce the number of different types of parts and simplify the installation process, all threaded connections in the structure use the same specifications, including tooth profile, pitch diameter, major diameter, minor diameter, lead, number of threads, and direction of rotation. The thread length is determined according to the requirements of the structure.

[0042] 2. The inner ring 6 and the edge main beam 4, the edge main beam 4 and the arc-shaped main beam 3, the edge main beam 4 and the edge secondary beam 2, the arc-shaped main beam 3 and the edge secondary beam 2, and the arc-shaped secondary beam 5 and the edge secondary beam 2 all adopt the same threaded connection scheme. The mounting plate 11 is clamped on both sides of the web of the I-beam to be connected, and the connection is made by using the longitudinal mounting plate 11, high-strength bolts 12, washers 13 and nuts 10.

[0043] 3. Multiple cantilever beams are provided around the inner ring 6. The edge main beam 4 is connected to the inner ring 6 through the cantilever beams of the inner ring 6. Multiple evenly distributed through holes with diameters matching the high-strength bolts 12 are provided on the cantilever beams of the inner ring 6 near the connection with the edge main beam 4. In this embodiment, the number of cantilever beams of the inner ring 6 is 8, and the through holes on the cantilever beams of the inner ring 6 near the connection with the edge main beam 4 are evenly distributed in 9 rows and 2 columns. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolts.

[0044] 4. The inner ring 6 contains a cross-shaped beam to enhance structural strength and rigidity. Each of the four beam arms of the cross-shaped beam has symmetrically distributed through holes along its width for installing eye bolts 7. The eye bolts 7 have a U-shaped structure. During installation, the eye bolts 7 are inserted from the top into the through holes distributed on the four beam arms of the cross-shaped beam in the inner ring 6. Eye washers 8 and two eye nuts 9 are then inserted from the bottom up to prevent loosening of the threaded connection.

[0045] 5. The main body of the edge beam 4 is an I-beam. One end of the edge beam 4 is connected to the outer beam of the inner ring 6, and the other end is connected to the concrete foundation 1. A longitudinal mounting plate 11 is provided at the connection between the edge beam 4 and the arc-shaped main beam 3 and the arc-shaped secondary beam 5, so that the edge beam 4 can be connected to the arc-shaped main beam 3 and the arc-shaped secondary beam 5 respectively. On the edge beam 4, at the connection with the outer beam of the inner ring 6, the connection with the arc-shaped main beam 3, the connection with the arc-shaped secondary beam 5, the longitudinal mounting plate 11, and the connection with the concrete foundation 1, there are multiple evenly distributed through holes with a diameter adapted to the diameter of the high-strength bolts 12. In this implementation scheme, there are 8 edge main beams. The through holes on the longitudinal mounting plate 11 at the connection between the edge main beam 4 and the outer beam of the inner ring 6, the connection between the edge main beam 4 and the arc-shaped main beam 3, and the connection between the edge main beam 4 and the arc-shaped secondary beam 5 are distributed in 9 rows and 2 columns. The through holes on the embedded steel plate 14 at the connection between the edge main beam 4 and the concrete foundation 1 are distributed in 4 rows and 4 columns. 4 rows and 2 columns are set on both sides along the width direction of the edge main beam 4. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolt 12.

[0046] 6. The main body of the arc-shaped main beam 3 is obtained by bending an I-beam. Both ends of the arc-shaped main beam 3 are connected to adjacent edge main beams 4, and an overhanging beam is provided in the middle to facilitate connection with the edge secondary beams 2. Multiple evenly distributed through holes with diameters matching the high-strength bolts 12 are provided on the longitudinal mounting plates 11 at the connections between the arc-shaped main beam 3 and adjacent edge main beams 4, and on the longitudinal mounting plates 11 at the connections between the overhanging beam and the edge secondary beams 2. In this embodiment, the number of arc-shaped main beams 3 is 8. The through holes on the longitudinal mounting plates 11 at the connections between the arc-shaped main beam 3 and adjacent edge main beams 4, and on the longitudinal mounting plates 11 at the connections between the overhanging beam and the edge secondary beams 2, are distributed in 9 rows and 2 columns. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolts 12.

[0047] 7. The main body of the edge secondary beam 2 is an I-beam. One end of the edge secondary beam 2 is connected to the overhanging beam of the curved main beam 3, and the other end is connected to the concrete foundation 1. A longitudinal mounting plate 11 is provided at the connection between the edge secondary beam 2 and the curved secondary beam 5 to achieve the connection between the edge secondary beam 2 and the curved secondary beam 5. On the edge secondary beam 2, multiple evenly distributed through holes with diameters adapted to the diameters of high-strength bolts 12 are provided on the longitudinal mounting plate 11 at the connection with the overhanging beam of the curved main beam 3, the connection with the curved secondary beam 5, and the embedded steel plate 14 at the connection with the concrete foundation 1. In this embodiment, there are 8 edge secondary beams 2. The through holes on the longitudinal mounting plate 11 at the connection between the edge secondary beam 2 and the overhanging beam of the arc-shaped main beam 3, and at the connection between the edge secondary beam 2 and the arc-shaped secondary beam 5 are distributed in 9 rows and 2 columns. The through hole distribution at the connection between the edge secondary beam 2 and the concrete foundation 1 is the same as the through hole distribution at the connection between the edge main beam 4 and the concrete foundation 1. They are distributed in 4 rows and 4 columns on the embedded steel plate 14. 4 rows and 2 columns are set on both sides along the width direction of the edge secondary beam 2. The diameter of the through hole is 1-2 mm larger than the diameter of the high-strength bolt 12.

[0048] 8. The main body of the arc-shaped secondary beam 5 is obtained by bending an I-beam. The two ends of the arc-shaped secondary beam 5 are connected to the adjacent edge main beam 4 and edge secondary beam 2, respectively. Multiple evenly distributed through holes with diameters matching the high-strength bolts 12 are provided on the longitudinal mounting plate 11 at the connection points between the arc-shaped main beam 3 and the adjacent edge main beam 4 and edge secondary beam 2. In this embodiment, the number of arc-shaped secondary beams 5 is 16. The through holes on the longitudinal mounting plate 11 at the connection points between the arc-shaped secondary beam 5 and the adjacent edge main beam 4 and edge secondary beam 2 are distributed in 9 rows and 2 columns, and the diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolts 12.

[0049] 9. The embedded steel plate 14 has through holes distributed at the connection points between the edge main beam 4 and the concrete foundation 1, and a tapered hole is machined on the lower side of the through holes. The diameter of the through holes is the same as that of the optical axis portion of the embedded bolts 15. During fabrication, each embedded bolt 15 is inserted into the through holes on the embedded steel plate 14, with the tail of the embedded bolt 15 on the same side as the tapered hole on the embedded steel plate 14. The embedded bolts 15 and the embedded steel plate 14 are then welded securely together. Before pouring the concrete foundation 1, the welded embedded steel plate 14, along with the embedded bolts 15, is embedded into the concrete foundation 1.

[0050] 10. The lattice column support consists of a base plate 20, base plate bolts 21, lattice column uprights 18, I-beam beams 16, and hand-operated hoists 17. There are four lattice column uprights 18, four I-beam beams 16, and four hand-operated hoists 17, evenly distributed. The base plate 20 has multiple through holes of the same diameter for the base plate bolts 21, and tapered holes are machined on the lower side of these through holes. Each base plate bolt 21 is inserted into its corresponding hole on the base plate 20 and then welded securely. During civil construction, the base plate 20 with the welded base plate bolts 21 is pre-embedded in the concrete foundation 1 according to the installation position of the inner ring 6, ensuring that the top surface of the base plate 20 is level. The lattice column uprights 18, I-beam beams 16, and hand-operated hoists 17 are prepared before construction and installed during construction.

[0051] 11. The lattice column 18 is welded from steel pipes, angle steel, and plates. The left and right sides of the lattice column 18 are composed of two upright steel pipes. Near the bottom and top, two horizontally placed steel pipes with the same diameter as the upright pipes are welded together. The middle section is formed by welding angle steel, including horizontal and diagonal braces to enhance structural rigidity and strength. The horizontal braces can also be used for scaffolding installation. The number and position of the horizontal and diagonal braces in the middle section are determined according to the height of the lattice column 18. At the bottom of the two upright steel pipes on the left and right sides of the lattice column 18, four evenly distributed triangular plates are welded around the circumference as reinforcing ribs to increase structural strength and rigidity.

[0052] 12. During assembly, place the inner ring 6 on the base plate 20 and adjust its posture and position according to the installation requirements. Simultaneously, transport the other edge main beams 4, edge secondary beams 2, arc-shaped main beams 3, and arc-shaped secondary beams 5 to the main structure hoisting area. Also, transport the lattice column support components—lattice column uprights 18, I-beam crossbeams 16, and hand-operated hoists 17—to the inner ring 6. Next, install the lattice column support. Insert the four lattice column uprights 18 sequentially into the four through holes inside the inner ring 6 and distribute them evenly along the circumference. Weld the bottom of each lattice column upright 18 firmly to the base plate 20. Weld I-beam crossbeams 16 between adjacent lattice column uprights 18 and install hand-operated hoists 17 on each I-beam crossbeam 16. Next, the lifting ropes of each hand chain hoist 17 are sequentially looped onto the four lifting eye bolts 7 corresponding to the inner ring 6. The hand chain hoists 17 are then activated to adjust the height and orientation of the inner ring 6 until it is in the target installation position. Temporary brackets 19 are then welded to the bottom contact point of the inner ring 6 on the lattice column support to temporarily fix the inner ring 6. After the inner ring 6 is temporarily fixed, a mast crane is installed on the lattice column support, and the eight edge main beams 4 are sequentially lifted using the mast crane. Each edge main beam 4 is temporarily fixed before lifting to control overall installation dimensional deviations. After the eight edge main beams 4 are in place, their positions are corrected. Once the positions are confirmed, the eight edge main beams 4 and the concrete foundation 1 are tightened using washers 13 and nuts 10. High-strength threaded fastening between the edge main beams 4 and the inner ring 6 is achieved using web plates 11, high-strength bolts 12, washers 13, and nuts 10. After the eight edge main beams 4 are secured, the eight curved main beams 3, the eight edge secondary beams 2, and the sixteen curved secondary beams 5 are installed in sequence. After the overall roof steel structure is installed, the temporary corbels 19, the hand-operated hoists 17, the I-beams 16, and the lattice column uprights 18 are removed in sequence.

[0053] Specific construction points:

[0054] (1) Installation of lattice column support base and reinforcement of the lower concrete structure

[0055] The base of the lattice column support is made of 30mm thick steel plate (4000×4000). The bottom of the steel plate is leveled with C30 fine stone concrete and steel plate. The leveling layer is compacted and the horizontal gap between the steel plate and the floor is evenly distributed. To ensure the safety of the internal frame hoisting, in addition to the Φ900 core column, 8 lattice column uprights are added under the floor and tightened under the floor slab. The steel lattice frame is made of 8 Φ159×6 horizontal supports and diagonal braces connected to form a lattice structure. The members of the upper hanging frame system are in corresponding positions. The steel plate under the steel pipe is made of 400×400×20 steel plate.

[0056] (2) The integral components of the inner ring of the roof are in place.

[0057] The inner circle 6 components are constructed by laying an inclined road, using four 20 channel steel beams, each 6 meters long, to form two steel beams, which are then used as tracks on the concrete inclined road (including the area to the indoor center). The tracks are then pulled to the designated position using steel wire ropes and a 3-ton winch.

[0058] (3) Installation of lattice column support

[0059] The lattice column support must be installed inside the inner ring integral component. Only after the lattice column support is installed can the inner ring 6 integral component be pulled.

[0060] The lattice column support hanger uses Φ159×6 pipes. Each Φ159×6 pipe is 9m long and requires a joint. The joints should be staggered by ≥2000m. First, each pipe is made into 4 pieces, and then a 60-ton tower crane is used for installation. A circular scaffold is erected outside the core tube. The upper pipes are connected on the scaffold using two joints. The Φ159×6 main uprights must be concentric and reinforced in sections.

[0061] The four sets of double Φ159×6 uprights are vertically equidistant, with the spacing between them ideally allowing passage through the arc-shaped flange plates of the integral component of the inner ring 6. The Φ159×6 steel pipes form a regular polygon, with each side intersecting at a height of shear bracing. The top end is fitted with a 125 I-beam as a crossbeam, resting on the top of the steel pipe end and welded together.

[0062] The installation of the Φ159×6 lattice column support system used to support the inner ring 6 integral components is carried out section by section from bottom to top. A double-row scaffolding of Φ48×3 steel pipes is pre-erected around the perimeter, with a horizontal spacing of 1500mm and a step distance of 2000mm. A row of scaffolding is erected starting 1.5m outward from the center point of the scaffolding, and a row of circular scaffolding is erected outside the Φ108 uprights for installation support and connection of uprights. As the support frame is raised, the scaffolding is pre-raised to ensure installation and usability.

[0063] The Φ159×6 pipes and pipe fittings are butt-welded by electric welding, with concentric connections to ensure welding quality and uniform stress distribution. The pipes are lifted vertically by a 60-ton tower crane used in the main structure construction, with support for installation. Temporary horizontal and shear force diagonal bracing is also provided at all times to ensure proper fixing of the vertical supports.

[0064] (4) Enhancement and traction of the overall components of the inner circle

[0065] After the lattice column support is installed, four lifting points are symmetrically set on the entire core ring component. Four 5T hand-operated hoists 17, suspended from the four I-beams 16 at the top of the support, are used for manual upward traction from these four points. At the start of traction, when the component is 200mm off the ground, the working condition of each part should be fully observed. Only after all checks are completed and no problems are found should the component be slowly raised. During the upward movement, the level of the workpiece must be checked constantly to prevent tilting of one side from causing overloading of a single hoist and resulting in instability and a major safety accident. Levelness measurement is performed here. It is stipulated that when the height in a certain direction is ≥50mm, upward traction in that direction should be stopped, and traction should be applied from the other three points to correct and level the component. Through continuous traction and ensuring the workpiece is level, and by applying force evenly, the ideal lifting effect can be achieved.

[0066] Due to the high installation height of the component, it must be lifted in multiple stages. Each lift requires a bracket on each side of the Φ159×6 structure to support the component's transfer and lifting layer. A stiffening plate must be installed under each bracket to ensure it can withstand the component's load. Simultaneously, a steel wire rope of equal thickness is looped around the component and locked with a lock to secure it to the upper steel beam. After the upper 5-ton hoist cable is reset and the lifting reaches a point where the fixing wire rope is no longer under stress, the stabilizing wire rope and bracket 19 are removed. At this point, the fixing wire rope is lifted along with the component. The inner ring 6 component is lifted back and forth every three to four meters. After the inner ring 6 component is hoisted, it should be temporarily secured to facilitate the installation of the remaining steel beams.

[0067] (5) Installation of mast crane and temporary lifting point on top of lattice column support

[0068] After the entire core ring 6 component is hoisted into place, a mast crane is installed on the lattice column support. The mast crane uses a single Φ108×4 diagonal upright, with the diagonal upright's legs connected to the main upright of the lattice column support using clamps. The upper end of the mast crane's diagonal upright is secured to the lattice column support via double steel wire ropes. The mast crane is hoisted using a pulley and steel wire rope system, with the steel wire rope having a diameter of Φ17mm, and is pulled using a winch.

[0069] The top of the lattice column support uses double-span Φ108×4 steel pipe flat beam-type lifting points as temporary lifting points at the beam ends during the hoisting of the main steel beam. The double-span steel pipes are connected to the top crossbeam 16 of the lattice column support using bolts to ensure the stability of the lifting points.

[0070] (6) Erection of the edge main beam

[0071] A lifting lug is installed at the center of gravity of the edge main beam 4. The main beam is lifted using a mast crane. During lifting, when the component is 200mm off the ground, the working condition of all parts is fully observed. After all inspections are completed and no problems are found, the beam is slowly raised. Ropes are used at both ends of the edge main beam 4 with designated personnel to prevent the main beam from swaying. After the edge main beam 4 is lifted to a certain height, it is installed using temporary lifting points at both ends. During lifting, the four through edge main beams 4 are first lifted sequentially to the elevation of the inner ring 6 as a whole component, and temporarily fixed to the inner ring 6 as a whole component using web plates and temporary fixing bolts. Then, the other four edge main beams 4 are installed using the same steps.

[0072] After the installation of the edge main beams 4, the position, height, center position, slope, dome, and elevation of the connecting studs between the main beams and the main structure were measured for the eight installed edge main beams 4. After repeated correction and confirmation, high-strength bolts 12 were used to replace the temporary bolts, and initial, intermediate, and final tightening were performed. The flanges of the steel beams were then welded together from bottom to top to form a complete, stable, and rigid system for the entire steel structure skylight.

[0073] (7) Hoisting of the arc-shaped main beam and the edge secondary beam

[0074] The curved main beam 3, edge secondary beam 2, and curved secondary beam 5 were hoisted using a tower crane and connected in place using a hand-operated hoist 17, and then assembled and connected with high-strength bolts 12. After all components were installed, they were sprayed with fireproof and rust-proof paint.

[0075] (8) Removal of lattice column supports

[0076] The lattice column supports are dismantled as the support system descends and is removed floor by floor. The Φ159×6 support system is dismantled in 6-8m sections, with welded joints cut using C2H2-O2 gas cutting. The frame is then lifted in small sections (≤1000kg) using a tower crane and placed on wooden sleepers on the second-floor indoor ground for removal. This process is repeated downwards. Dismantling must be directed and monitored by designated personnel. When no work is being done on the upper level, the lower steel pipe scaffolding must be removed. Simultaneously, fire prevention and measures to prevent falling components must be implemented.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0078] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A prefabricated steel structure roof, characterized in that: The structure includes a concrete foundation (1) and a steel roof body detachably connected to the concrete foundation (1); the steel roof body includes an inner ring (6) located in the middle, several edge main beams (4) evenly distributed around the outer periphery of the inner ring (6), several arc-shaped main beams (3) detachably set between two edge main beams (4), edge secondary beams (2) detachably connected at both ends to the arc-shaped main beams (3) and the concrete foundation (1) respectively, and several arc-shaped secondary beams (5) detachably set between the edge secondary beams (2) and the edge main beams (4); A number of outward beams, the same number as the number of edge main beams (4), are uniformly fixed outside the inner ring (6). The length of the outward beams is shorter than the length of the edge main beams (4). The two ends of the arc-shaped main beam (3) are connected to the adjacent edge main beams (4), and an outward beam is provided in the middle to facilitate the connection of the edge secondary beams (2). The two ends of the edge main beams (4) are connected to the outward beams of the inner ring (6) and the concrete foundation (1), respectively. The inner side of the top of the concrete foundation (1) is provided with a groove for accommodating the edge main beams (4) and the edge secondary beams (2).

2. The prefabricated steel structure roof according to claim 1, characterized in that: The inner ring (6) is provided with a cross beam to enhance the structural strength and rigidity; the upper end face of the cross beam arm is provided with eye bolts (7) symmetrically distributed along the width direction; the eye bolts (7) are U-shaped.

3. The prefabricated steel structure roof according to claim 1, characterized in that: The main body of the outer beam, edge main beam (4), arc-shaped main beam (3), edge secondary beam (2) and arc-shaped secondary beam (5) of the inner ring (6) are all I-beams.

4. A prefabricated steel structure roof according to claim 3, characterized in that: The inner ring (6) and the edge main beam (4), the edge main beam (4) and the arc main beam (3), the arc main beam (3) and the edge secondary beam (2), and the arc secondary beam (5) and the edge secondary beam (2) are all connected by the same thread. The web plates of the connected I-beams are connected by mounting plates (11), high-strength bolts (12), washers (13) and nuts (10).

5. A prefabricated steel structure roof according to claim 4, characterized in that: The through holes on the longitudinal plate at the connection between the two ends of the arc-shaped main beam (3) and the adjacent edge main beam (4), and on the mounting plate (11) at the connection between the middle outward beam of the arc-shaped main beam (3) and the edge secondary beam (2), are distributed in 9 rows and 2 columns. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolt (12).

6. A prefabricated steel structure roof according to claim 5, characterized in that: The through holes on the longitudinal plates at the connection between the edge main beam (4) and the inner ring (6) cantilever beam, the connection between the edge main beam (4) and the arc main beam (3), and the connection between the edge main beam (4) and the arc secondary beam (5) are arranged in 9 rows and 2 columns. The through holes on the bottom plate at the connection between the edge main beam (4) and the concrete foundation (1) are arranged in 4 rows and 4 columns. 4 rows and 2 columns are set on both sides along the width direction of the edge main beam (4). The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolt (12). There are 8 arc main beams (3). The through holes on the longitudinal plates at the connection between the two ends of the arc main beam (3) and the adjacent edge main beam (4), and the longitudinal plates at the connection between the middle cantilever beam of the arc main beam (3) and the edge secondary beam (2) are all arranged in 9 rows and 2 columns. The diameter of the through holes is 1-2 mm larger than the diameter of the high-strength bolt (12).

7. A prefabricated steel structure roof according to claim 1, characterized in that: The number of curved main beams (3) is 8; the number of edge main beams (4) is 8; the number of edge secondary beams (2) is 8; and the number of curved secondary beams (5) is 16.

8. A prefabricated steel structure roof according to claim 3, characterized in that: An embedded steel plate (14) is provided at the connection between the groove of the concrete foundation (1) and the edge main beam (4) and the edge secondary beam (2).

9. A prefabricated steel structure roof according to claim 5, characterized in that: The embedded steel plate (14) is provided with through holes that are distributed at the connection between the edge main beam (4) and the concrete foundation (1); the upper ends of several embedded bolts (15) are provided with threads and extend above the embedded steel plate (14); hooks are provided at the bottom and fixed inside the concrete foundation (1).

10. A method for assembling and constructing a prefabricated steel structure roof, based on the prefabricated steel structure roof described in any one of claims 1-9, characterized in that, The steps are as follows: S1. Pull the inner circle (6) as a whole component to the center of the bottom floor of the central hall, and at the same time transport the edge secondary beam (2), the arc-shaped main beam (3), the edge main beam (4), and the arc-shaped secondary beam (5) to the main structure waiting area; S2. A lattice column support is erected inside the inner ring (6) integral component. Four hand chain hoists (17) are symmetrically installed on the crossbeam (16) at the top of the support, and eye bolts (7) are installed on the inner ring (6) integral component. S3. Using four symmetrical hand-operated hoists (17) at the top of the lattice column support, pull the inner ring (6) component to the predetermined height and temporarily fix it with welded brackets (19); S4. Install a mast crane on the lattice column support. The mast crane is supported by a single rod. The lifting point of the mast crane is set near the installation center of the edge main beam (4). S5. First, hoist and temporarily fix the four edge main beams (4) to control the overall installation size deviation of the roof system, and then install the other four edge main beams (4) in the same way as above. S6. The positions of the 8 edge main beams (4) that have been installed are corrected and then tightened with high-strength bolts (12) after confirmation. S7. Hoist the remaining arc-shaped main beam (3), edge secondary beam (2) and arc-shaped secondary beam (5) into place and assemble them with high-strength bolts (12); S8. Remove the lower lattice column support.

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