CN115898027B - Sectional lifting and assembling method for large-span roof structure - Google Patents

Abstract

The invention discloses a sectional lifting assembly method of a large-span roof structure, which comprises the following steps: A. dividing the area by splicing elevation; B. assembling a single truss structure; C. installing a hydraulic lifter at the top end of the structural column; D. a hydraulic lifter is arranged at the top end of the supporting frame; E. mounting sliding structures on the splicing platforms of the second area and the third area; F. enabling the first truss frame structure to reach the outer side of the splicing platform of the second area; G. the first truss structure and the second truss structure are fixed by supplementing rods; H. the first truss structure and the second truss structure which are fixedly connected are controlled to reach the outer side of the splicing platform of the third area; I. and (C) repeating the step (G) and fixing the third truss frame structure and the second truss frame structure by supplementing rods. The invention ensures full welding between the grid structure and the rod piece, improves the welding strength between the grid structure and the rod piece, ensures the accurate repair welding position of the rod piece, improves the welding quality and ensures that the whole large-span grid structure meets the construction requirement.

Description

A method for assembling large-span roof structures by segmented lifting

Technical Field

The invention belongs to the technical field of steel structure construction, and in particular relates to a segmented lifting and assembling method for a large-span roof structure.

Background Art

With the development of steel structures, spatial structures are pursuing larger spans, higher spaces, and more complex structures. The roof of this structure usually adopts steel trusses and grid structures. When installing such structures, the overall lifting method is usually used. The overall lifting method is a construction method in which the structure is assembled as a whole at the projection position on the ground, and then the structure is lifted to the designed position through a temporary frame or a lifting platform on the structural column, using hydraulic jacks, steel strands and other lifting equipment.

When lifting the large-span grid structure to the designed position, the lifting height is high, which poses a safety hazard. In order to solve this technical problem, the technicians in this field lift the large-span roof structure in sections at different elevations, assemble the grid structure on assembly platforms at different elevations, and lift the grid structure from low to high. First, lift the first grid structure. When the first grid structure and the second grid structure correspond to each other, add rods between the first grid structure and the second grid structure, and then lift the overall structure of the first grid structure and the second grid structure. When the second grid structure and the third grid structure correspond to each other, add rods between the second grid structure and the third grid structure, and then lift the fixed overall structure of the first grid structure, the second grid structure and the third grid structure to the set position, shortening the lifting distance of the entire large-span grid structure and ensuring the safety of the lifting process.

However, the position of the supplementary rods between two adjacent truss structures is on the outside of the assembly platform. At this time, the welding point of the rod is in a suspended state, which makes it impossible to fully weld the welding point. It is also easy to cause deviations in the welding position, affecting the welding quality and causing the strength of the supplementary rods between the truss structures to fail to meet the design requirements.

Summary of the invention

The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art and to provide a method for lifting and assembling a large-span roof structure in sections, which can divide a large-span grid structure into multiple sections, assemble the grid structure in sections on assembly platforms at different elevations, and then lift and fix the segmented grid structure with additional rods, thereby shortening the lifting distance of the entire large-span grid structure and ensuring the safety of the lifting process.

Moreover, the grid structure can be moved during the lifting process, and the rod replacement between the grid structure being lifted and the assembled grid structure can be completed on the assembly platform. At the same time, the two grid structures with the rod replacement can be positioned to ensure full welding between the grid structure and the rods, improve the welding strength between the grid structure and the rods, ensure the accuracy of the rod replacement welding position, improve the welding quality, and make the entire large-span grid structure meet the construction requirements.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A method for assembling a large-span roof structure in sections, characterized by comprising the following steps:

A. Divide the area by assembling elevations, and divide it into Area 1, Area 2 and Area 3 from low to high elevations.

B. Assemble a single grid structure on the assembly platforms in Area 1, Area 2 and Area 3, and tie a fixing rope to each grid structure.

C. Install a hydraulic lifter on the top of the structural column.

D. Install a support frame between the two structural columns in Area 1 and Area 2, and then install a hydraulic lifter on the top of the support frame.

E. Install a sliding structure on the assembly platform of area 2 and area 3. The sliding structure includes a sleeve 1, a sleeve 2, a moving assembly, an assembly plate, a hydraulic cylinder and a positioning assembly. The moving assembly includes a mounting plate and a roller. The mounting plate is provided with a mounting end. The mounting plate is provided with a notch. The roller is arranged in the notch. The roller rotates on the mounting plate through a rotating shaft. Both the sleeve 1 and the sleeve 2 are provided with a penetrating mounting hole. The positioning assembly includes two symmetrically arranged positioning plates. Both sides of the positioning plates are provided with clamping plates. The specific steps are as follows:

(1) According to the construction drawings, fix the casing and the hydraulic cylinder at the set positions of the assembly platform.

(2) According to the construction drawings, the second sleeve is fixed at the set position of the assembly platform, and the second sleeve and the first sleeve are set corresponding to each other.

(3) The moving components are installed one by one in the mounting hole of the sleeve 1 and the mounting hole of the sleeve 2, the outer wall of the mounting plate and the inner wall of the mounting hole are in close contact, and the roller rolls on the inner wall of the mounting hole.

(4) Adjust the position of the moving assembly, and then fix the assembly plate to the mounting end of the mounting plate by bolts. Ear plates are welded on both sides of the assembly plate.

(5) Move the assembly plate toward the hydraulic cylinder, and then weld the piston rod end and the ear plate on the hydraulic cylinder to fix them.

(6) Place the positioning plate vertically on the assembly plate, and then install the clamping plate on the fixing rod on the side of the positioning plate. The positioning plate is provided with a fixing hole. Then screw the nut into the fixing rod, adjust the installation position of the positioning plate, and then tighten the nut.

F. Fix the steel wire rope on the hydraulic lifter at the top of the structural column and the first grid structure in area one, and then start the hydraulic lifter to control the first grid structure to move upward a set distance so that it reaches the outside of the assembly platform in area two.

G. Fix the first and second grid structures with additional rods:

(1) Pull the fixing rope on the first grid structure toward the second grid structure by a set distance, and then fix the fixing rope to the fixing hole.

(2) Turn on the hydraulic cylinder, which controls the assembly plate to move a set distance toward the second grid structure, so that the first grid structure moves a set distance toward the second grid structure, so that the outer end of the first grid structure is located in the area between the two positioning plates.

(3) The outer end of the second grid structure is placed into the area between the two positioning plates. The positioning plates simultaneously position the first grid structure and the second grid structure. The operator welds the rods between the first grid structure and the second grid structure on the assembly plate.

H. Return the hydraulic cylinder to its initial position, so that the first grid structure and the second grid structure that are fixedly connected move outward by a set distance, then untie the fixing rope on the first grid structure from the fixing hole, and then fix the steel rope on the hydraulic lifter at the top of the other structural column and the second grid structure in area two, and then untie the steel rope on the hydraulic lifter at the top of the support frame and the first grid structure in area one, and then start the hydraulic lifter to control the first grid structure and the second grid structure that are fixedly connected to move upward by a set distance, so that they reach the outside of the assembly platform in area three.

I. Repeat step G to fix the third grid structure and the second grid structure with additional rods, and then return the hydraulic cylinder to the initial position, so that the first grid structure, the second grid structure and the third grid structure that are fixedly connected move outward by a set distance, and then start the hydraulic lifter to control the overall structure of the first grid structure, the second grid structure and the third grid structure that are fixedly connected to move upward by a set distance.

Furthermore, when installing the sleeve 1 and the hydraulic cylinder, a groove is cut at a set position on the side of the assembly platform to form an installation groove, and then concrete is filled in the installation groove, and a pre-embedded screw rod 1 is set in the concrete. When the concrete solidifies, the pre-embedded screw rod 1 can be fixed to the side of the assembly platform, and then the fixing seat 1 of the installation sleeve 1 is installed on the pre-embedded screw rod 1, and then a nut is screwed into the pre-embedded screw rod 1 and tightened, and then the fixing seat 2 of the hydraulic cylinder is installed on another pre-embedded screw rod 1, and then a nut is screwed into the pre-embedded screw rod 1 and tightened.

Furthermore, a reinforcing plate 1 is welded at the corner of the fixing seat 1.

Furthermore, when installing the second sleeve, a groove is cut at a set position on the top of the assembly platform to form an installation groove, and then concrete is filled in the installation groove, and a pre-embedded screw rod 2 is set in the concrete. When the concrete solidifies, the pre-embedded screw rod 2 can be fixed at the top of the assembly platform, and then the fixing seat 3 of the second sleeve is installed on the pre-embedded screw rod 2, and then a nut is screwed into the pre-embedded screw rod 2 and tightened.

Furthermore, a support rod is fixed at the assembly platform, the support rod is located below the second sleeve, the support rod is threadedly connected to a support head, and a locking nut is welded to the outside of the support head. When the second sleeve is installed, the locking nut is screwed to allow the support head to support the bottom surface of the second sleeve.

Furthermore, when the sleeve 2 is fixed, a support assembly is installed on the top of the assembly platform. The support assembly includes a fixed seat 4 and a rolling roller. The rolling roller rotates on the fixed seat 4 through a rotating shaft. When the assembly plate is fixed, the support assembly is located below the assembly plate, and the assembly plate is supported on the rolling roller.

Furthermore, when installing the support component, a groove is cut at a set position on the top of the assembly platform to form an installation groove, and then concrete is filled in the installation groove, and a pre-embedded screw rod three is set in the concrete. When the concrete solidifies, the pre-embedded screw rod three can be fixed at the top of the assembly platform, and then the fixing seat four is installed on the pre-embedded screw rod three, and then a nut is screwed into the pre-embedded screw rod three and tightened.

Furthermore, a reinforcing plate 2 is welded at the corner of the fixing seat 4.

The present invention has the following beneficial effects due to the adoption of the above technical solution:

1. The present invention can divide a large-span grid structure into multiple sections, assemble the grid structure in sections on assembly platforms at different elevations, and then lift and fix the segmented grid structure with additional rods, thereby shortening the lifting distance of the entire large-span grid structure and ensuring the safety of the lifting process.

2. The present invention can move the grid structure during the lifting process, and the rod patching between the grid structure being lifted and the assembled grid structure is completed on the assembly platform. At the same time, the two grid structures for the rod patching are positioned to ensure full welding between the grid structure and the rods, improve the welding strength between the grid structure and the rods, ensure the accuracy of the rod patching position, improve the welding quality, and make the entire large-span grid structure meet the construction requirements.

3. The present invention installs moving components one by one in the mounting holes of the first sleeve and the second sleeve, so that the grid structure can move directionally between the first sleeve and the second sleeve during the rod replenishment process, thereby ensuring the safety of the movement of the grid structure.

Taking into account that the grid structure has a large weight, when it is pressed on the assembly plate, it will apply a large pressure to the assembly, making it difficult to move the assembly plate. To address this technical problem, the present invention installs rollers in the grooves of the mounting plate, so that the assembly plate moves on the rollers, which turns into rolling friction, thereby improving the smoothness of the movement of the assembly plate and meeting the movement of a grid structure of a certain weight. The hoisting grid structure can be moved into the set position of the assembly platform for fixing with additional rods.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings:

FIG1 is a schematic diagram of the structure of installing a support frame between two structural columns in area 1 and area 2 in the present invention;

FIG2 is a schematic structural diagram of the first grid structure and the second grid structure being fixed with supplementary rods in the present invention;

FIG3 is a schematic diagram of the structure of the embedded screw rod 1, the embedded screw rod 2 and the embedded screw rod 3 in the present invention;

FIG4 is a schematic structural diagram of the present invention when the sleeve 1 and the hydraulic cylinder are fixed at the set position of the assembly platform;

FIG5 is an enlarged schematic diagram of the structure at C in FIG4 ;

FIG6 is a schematic diagram of the structure of the hydraulic cylinder in the present invention;

FIG7 is a schematic diagram of the structure of a sleeve 1 in the present invention;

FIG8 is a schematic diagram of the structure of the support assembly of the present invention;

FIG9 is a schematic diagram of the structure of the support assembly of the present invention after installation;

FIG10 is a schematic diagram of the structure of the sleeve 2 in the present invention;

FIG11 is a schematic structural diagram of the present invention when the second sleeve is fixed at a set position of the assembly platform;

FIG12 is a schematic diagram of the structure of the mobile assembly of the present invention;

FIG13 is a schematic diagram of the structure of the assembly plate of the present invention;

14 is a schematic structural diagram of the present invention in which the assembly plate is fixed to the mounting end of the mounting plate by bolts;

FIG15 is a schematic diagram of the structure of the positioning assembly in the present invention;

FIG16 is a schematic diagram of the structure of the present invention after the positioning assembly is installed;

FIG. 17 is a schematic structural diagram of the positioning assembly of the present invention when positioning the grid structure.

In the figure, A-area one; B-area two; a-first grid structure; b-second grid structure; 1-structural column; 2-support frame; 3-assembly platform; 4-embedded screw one; 5-embedded screw two; 6-embedded screw three; 7-hydraulic cylinder; 8-casing one; 9-mounting hole; 10-fixing seat one; 11-reinforcement plate one; 12-fixing seat two; 13-support rod; 14-locking nut; 15-support head; 16-rolling roller; 17-fixing seat four; 18-reinforcement plate two; 19-casing two; 20-fixing seat three; 21-mounting plate; 22-slot; 23-roller; 24-assembly plate; 25-ear plate; 26-positioning plate; 27-fixing hole; 28-clamping plate; 29-fixing rod; 30-installation end.

DETAILED DESCRIPTION

As shown in FIG. 1 to FIG. 17 , a segmented lifting and assembling method of a large-span roof structure of the present invention is shown, in which the large-span roof structure is divided into three segments, and the number of segments is adjusted specifically according to the length of the large-span roof structure.

The assembly method specifically includes the following steps:

A. Divide the area by assembling elevations, from low to high elevations, into Area 1A, Area 2B and Area 3.

B. Assemble a single grid structure on the assembly platform 3 in area 1A, area 2B and area 3, and tie a fixing rope to each grid structure.

C. A hydraulic lifter is installed at the top of the structural column 1. The hydraulic lifter is a prior art. Specifically, reference is made to the utility model patent named through-type hydraulic lifter (authorization announcement number: CN2866450Y) in the comparative document. The structure of the hydraulic lifter will not be described in detail in the present invention.

D. Install support frame 2 between two structural columns 1 in area 1 A and area 2 B, and then install a hydraulic lifter on the top of support frame 2.

E. Install a sliding structure on the assembly platform 3 of area 2B and area 3. The sliding structure includes a sleeve 1 8, a sleeve 2 19, a moving assembly, an assembly plate 24, a hydraulic cylinder 7 and a positioning assembly. The moving assembly includes a mounting plate 21 and a roller 23. The mounting plate 21 is provided with a mounting end 30. The mounting plate 21 is provided with a notch 22. Six rollers 23 are arranged in the notch 22. The rollers 23 rotate on the mounting plate 21 through a rotating shaft. Both the sleeve 1 8 and the sleeve 2 19 are provided with a through mounting hole 9. The positioning assembly includes two symmetrically arranged positioning plates 26. Both sides of the positioning plate 26 are provided with a clamping plate 28. The specific steps are as follows:

(1) According to the construction drawings, the sleeve 8 and the hydraulic cylinder 7 are fixed at the set position of the assembly platform 3. Specifically, when installing the sleeve 8 and the hydraulic cylinder 7, a groove is cut at the set position on the side of the assembly platform 3 to form an installation groove, and then concrete is filled in the installation groove, and a pre-embedded screw 4 is set in the concrete. When the concrete solidifies, the pre-embedded screw 4 can be fixed at the side of the assembly platform 3 to improve the firmness of the pre-embedded screw 4 on the assembly platform 3. Then, the fixing seat 10 of the installation sleeve 8 is installed on the pre-embedded screw 4, and the reinforcing plate 11 is welded at the corner of the fixing seat 10. Then, a nut is screwed into the pre-embedded screw 4 and tightened, and then the fixing seat 2 12 of the hydraulic cylinder 7 is installed on another pre-embedded screw 4, and then a nut is screwed into the pre-embedded screw 4 and tightened.

(2) According to the construction drawings, the second sleeve 19 is fixed at the set position of the assembly platform 3. The second sleeve 19 and the first sleeve 8 are arranged corresponding to each other. Specifically, when installing the second sleeve 19, a groove is cut at the set position on the top of the assembly platform 3 to form an installation groove, and then concrete is filled in the installation groove, and a pre-embedded screw 2 5 is arranged in the concrete. When the concrete solidifies, the pre-embedded screw 2 5 can be fixed at the top of the assembly platform 3, thereby improving the firmness of the pre-embedded screw 2 5 on the assembly platform 3. Then, the fixing seat 3 20 of the second sleeve 19 is installed on the pre-embedded screw 2 5, and then a nut is screwed into the pre-embedded screw 2 5 and tightened.

The support rod 13 is fixed at the assembly platform 3. The support rod 13 is below the sleeve 19. The support rod 13 is threadedly connected with a support head 15. A locking nut 14 is welded to the outside of the support head 15. When the sleeve 19 is installed, the locking nut 14 is screwed to make it easier to lift the support head 15. The support head 15 supports the sleeve 19 so that the support head 15 supports the bottom surface of the sleeve 19, thereby improving the bearing capacity of the sleeve 19 and making the moving assembly move smoothly to meet the needs of the later rod replenishment operation.

After the second sleeve 19 is fixed, a support assembly is installed on the top of the assembly platform 3. The support assembly includes a fixed seat 4 17 and a rolling roller 16. A reinforcing plate 2 18 is welded at the corner of the fixed seat 4 17. The rolling roller 16 rotates on the fixed seat 4 17 through a rotating shaft. When the assembly plate 24 is fixed, the support assembly is located below the assembly plate 24. The assembly plate 24 is supported on the rolling roller 16, which improves the bearing capacity of the assembly plate 24, so that the assembly plate 24 meets the rod-replenishing operation of the grid structure.

When installing the support assembly, a groove is cut at a set position on the top of the assembly platform 3 to form an installation groove, and then concrete is filled in the installation groove, and a pre-embedded screw rod 3 6 is arranged in the concrete. When the concrete solidifies, the pre-embedded screw rod 3 6 can be fixed at the top of the assembly platform 3, thereby improving the firmness of the pre-embedded screw rod 3 6 on the assembly platform 3. Then, the fixing seat 4 17 is installed on the pre-embedded screw rod 3 6, and then a nut is screwed into the pre-embedded screw rod 3 6 and tightened.

(3) The moving components are installed one by one in the mounting hole 9 of the sleeve 1 8 and the mounting hole 9 of the sleeve 2 19 , the outer wall of the mounting plate 21 and the inner wall of the mounting hole 9 are in close contact, and the roller 23 rolls on the inner wall of the mounting hole 9 .

(4) Adjust the position of the moving assembly, and then fix the assembly plate 24 to the mounting end 30 of the mounting plate 21 by bolts. Ear plates 25 are welded on both sides of the assembly plate 24.

(5) Move the assembly plate 24 toward the hydraulic cylinder 7, and then weld the piston rod end of the hydraulic cylinder 7 and the ear plate 25 to fix them.

(6) Place the positioning plate 26 vertically on the assembly plate 24, and then install the clamping plate 28 on the fixing rod 29 on the side of the positioning plate 26. The positioning plate 26 is provided with a fixing hole 27. Then, screw a nut onto the fixing rod 29, adjust the installation position of the positioning plate 26, and then tighten the nut.

F. Fix the steel wire rope on the hydraulic lifter at the top of the structural column 1 and the first grid structure in area 1A, and fix them with the steel wire rope on the hydraulic lifter at the top of the support frame 2 and the first grid structure in area 1A, then start the hydraulic lifter to control the first grid structure to move upward a set distance so that it reaches the outside of the assembly platform 3 in area 2B.

G. Fix the first grid structure a and the second grid structure b with additional rods:

(1) Pull the fixing rope on the first grid structure a toward the second grid structure b by a set distance, which is L1, and then fix the fixing rope to the fixing hole 27.

(2) The hydraulic cylinder 7 is turned on. The hydraulic cylinder 7 controls the assembly plate 24 to move a set distance in the direction of the second grid structure b. The distance is L2, 0.5m＜L1+L2＜1m, and the total length of L1+L2 shall not be too long, so that the first grid structure a moves a set distance in the direction of the second grid structure b, so that the outer end of the first grid structure a is located in the area between the two positioning plates 26.

(3) The outer end of the second grid structure b is placed into the area between the two positioning plates 26. The positioning plates 26 simultaneously position the first grid structure a and the second grid structure b. The operator welds the rods between the first grid structure a and the second grid structure b on the assembly plate 24.

H. Return the hydraulic cylinder 7 to its initial position, so that the first grid structure a and the second grid structure b that are fixedly connected move outward by a set distance, then untie the fixing rope on the first grid structure a from the fixing hole 27, and then fix the steel rope on the hydraulic lifter at the top of the other structural column 1 and the second grid structure b in area two B, and then untie the steel rope on the hydraulic lifter at the top of the support frame 2 and the first grid structure a in area one A, and then start the hydraulic lifter to control the first grid structure a and the second grid structure b that are fixedly connected to move upward by a set distance, so that they reach the outside of the assembly platform 3 in area three.

I. Repeat step G to fix the third grid structure and the second grid structure b with additional rods, and then return the hydraulic cylinder 7 to the initial position, so that the first grid structure a, the second grid structure b and the third grid structure that are fixedly connected move outward by a set distance, and then start the hydraulic lifter to control the overall structure of the first grid structure a, the second grid structure b and the third grid structure that are fixedly connected to move upward by a set distance.

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims (8)

1. The sectional lifting and assembling method for the large-span roof structure is characterized by comprising the following steps of:

A. Dividing the area into a first area, a second area and a third area sequentially from the elevation to the elevation through splicing elevations;

B. assembling single truss structures on the assembling platforms of the first area, the second area and the third area, and tying fixed ropes on each truss structure;

C. Installing a hydraulic lifter at the top end of the structural column;

D. Installing a support frame between two structural columns in the first area and the second area, and installing a hydraulic lifter at the top end of the support frame;

E. The sliding structure is arranged on the splicing platforms in the second area and the third area and comprises a first sleeve, a second sleeve, a moving assembly, a splicing plate, a hydraulic cylinder and a positioning assembly; the moving assembly comprises a mounting plate and a roller, wherein the mounting plate is provided with a mounting end part, the mounting plate is provided with a notch, the roller is arranged in the notch, the roller rotates on the mounting plate through a rotating shaft, and the first sleeve and the second sleeve are respectively provided with a penetrating mounting hole; the locating component comprises two locating plates which are symmetrically arranged, clamping plates are arranged on two sides of each locating plate, and the locating component comprises the following specific steps:

(1) According to a construction drawing, fixing the sleeve I and the hydraulic cylinder at a set position of the assembly platform;

(2) According to a construction drawing, fixing a second sleeve at a set position of the assembly platform, wherein the second sleeve and the first sleeve are correspondingly arranged;

(3) The installation holes of the first sleeve and the second sleeve are respectively provided with a moving assembly, the outer wall of the installation plate is clung to the inner wall of the installation hole, and meanwhile, the roller rolls in contact with the inner wall of the installation hole;

(4) Adjusting the position of the moving assembly, fixing the assembly plate on the mounting end part of the mounting plate through bolts, and welding lug plates on two sides of the assembly plate;

(5) Moving the assembling plate towards the direction of the hydraulic cylinder, and then welding and fixing the end part of a piston rod on the hydraulic cylinder and the lug plate;

(6) Vertically placing the positioning plate on the assembling plate, then installing the clamping plate on a fixed rod on the side surface of the positioning plate, arranging a fixed hole on the positioning plate, screwing a nut on the fixed rod, adjusting the installation position of the positioning plate, and screwing the nut;

F. Fixing a steel twisted rope on a hydraulic lifter at the top end of a structural column and a first truss structure in a first area, fixing the steel twisted rope on the hydraulic lifter at the top end of a supporting frame and the first truss structure in the first area, starting the hydraulic lifter, and controlling the first truss structure to move upwards for a set distance to reach the outer side of a splicing platform of the second area;

G. The first truss structure and the second truss structure are fixed by supplementing rods:

(1) Pulling the fixing ropes on the first truss structure to a set distance in the direction of the second truss structure, and fixing the fixing ropes on the fixing holes;

(2) Starting a hydraulic cylinder, wherein the hydraulic cylinder controls the assembling plates to move a set distance to the direction of the second truss structure, so that the first truss structure moves a set distance to the direction of the second truss structure, and the outer end of the first truss structure is arranged in an area between two positioning plates;

(3) The outer end of the second truss structure is placed in an area between two positioning plates, the positioning plates simultaneously position the first truss structure and the second truss structure, and operators repair-weld rod pieces between the first truss structure and the second truss structure on the assembly plates;

H. restoring the hydraulic cylinder to an initial position, enabling the first truss frame structure and the second truss frame structure which are fixedly connected to move outwards for a set distance, then unwinding a fixed rope on the first truss frame structure from a fixed hole, then fixing a steel strand on a hydraulic lifter at the top end of another structural column and the second truss frame structure in the area II, unwinding the steel strand on the hydraulic lifter at the top end of the supporting frame and the first truss frame structure in the area I, then starting the hydraulic lifter, and controlling the first truss frame structure and the second truss frame structure which are fixedly connected to move upwards for a set distance so as to enable the first truss frame structure and the second truss frame structure to reach the outer side of the assembly platform in the area III;

I. And (C) repeating the step (G), fixing the third truss frame structure and the second truss frame structure by supplementing rods, and returning the hydraulic cylinder to the initial position, so that the first truss frame structure, the second truss frame structure and the third truss frame structure which are fixedly connected move outwards by a set distance, and then starting the hydraulic lifter to control the integral structure of the first truss frame structure, the second truss frame structure and the third truss frame structure which are fixedly connected to move upwards by the set distance.

2. The method for sectional lifting and assembling a large-span roof structure according to claim 1, wherein the method comprises the following steps: when the first sleeve and the hydraulic cylinder are installed, a groove is formed in a set position of the side part of the assembly platform, a mounting groove is formed, concrete is filled in the mounting groove, an embedded screw rod I is arranged in the concrete, when the concrete is solidified, the embedded screw rod I can be fixed at the side part of the assembly platform, then a fixing seat I of the first sleeve is installed on the embedded screw rod I, a nut is screwed in the embedded screw rod I, the nut is screwed in, a fixing seat II of the hydraulic cylinder is installed on the other embedded screw rod I, the nut is screwed in the embedded screw rod I, and the nut is screwed in.

3. The method for sectional lifting and assembling a large-span roof structure according to claim 2, wherein: welding a reinforcing plate I at the corner of the fixing seat I.

4. The method for sectional lifting and assembling a large-span roof structure according to claim 1, wherein the method comprises the following steps: when the second sleeve is installed, a groove is formed in a set position at the top of the assembly platform, an installation groove is formed, concrete is filled in the installation groove, a second embedded screw is arranged in the concrete, when the concrete is solidified, the second embedded screw can be fixed at the top of the assembly platform, then a third fixing seat of the second sleeve is installed on the second embedded screw, a nut is screwed in the second embedded screw, and the nut is screwed.

5. The method for sectional lifting and assembling a large-span roof structure according to claim 1, wherein the method comprises the following steps: the support rod is fixed at the splicing platform and is positioned below the second sleeve, the support rod is in threaded connection with a support head, a lock nut is welded on the outer side of the support head, and after the second sleeve is installed, the lock nut is screwed, so that the support head supports the bottom surface of the second sleeve.

6. The method for sectional lifting and assembling a large-span roof structure according to claim 1, wherein the method comprises the following steps: after the second sleeve is fixed, the support assembly is arranged at the top of the assembly platform, the support assembly comprises a fixing seat IV and a rolling roller, the rolling roller rotates on the fixing seat IV through a rotating shaft, after the assembly plate is fixed, the support assembly is arranged below the assembly plate, and the assembly plate is supported on the rolling roller.

7. The method for sectional lifting and assembling a large-span roof structure according to claim 6, wherein: when the support component is installed, a groove is formed in a set position at the top of the assembly platform, an installation groove is formed, concrete is filled in the installation groove, a third embedded screw rod is arranged in the concrete, when the concrete is solidified, the third embedded screw rod can be fixed at the top of the assembly platform, then the fourth fixed seat is installed on the third embedded screw rod, a nut is screwed into the third embedded screw rod, and the nut is screwed.

8. The method for sectional lifting and assembling a large-span roof structure according to claim 6, wherein: and welding a reinforcing plate II at the corner of the fixing seat IV.