Construction technology of super-long cross-diamond-rod rectangular frame

Abstract

The application relates to the field of building, and discloses a construction process of an ultra-long cross-diamond-shaped-rod rectangular frame, which comprises the following steps: 1, setting a frame rod piece allowance; 2, setting a frame assembling jig; 3, assembling and welding left and right side single-frame assemblies; 4, assembling and welding end single-frame assemblies; and 5, assembling and welding the whole frame. The frame can be processed in a small site, and can be carefully detected in separate processing, so that the qualified rate of the frame is improved during final assembly. When the frame is welded separately, the frame can be checked one by one, the processing and manufacturing precision of the frame assembly is improved, and the small frame can be conveniently and carefully checked by the staff, so that the qualified rate of installation is improved during assembly.

Description

Technical Field

[0001] This invention relates to the field of construction, specifically a construction process for an ultra-long span rhomboid-shaped rectangular frame. Background Technology

[0002] The ultra-long span rhomboid rod rectangular frame, the main structure of which is the sea-extending wharf module, the main structure of which is the conveyor belt frame, the roadway, and the headstock supporting the main shaft box, with a total weight of approximately 2,800 tons.

[0003] The conveyor belt frame is mainly constructed of square steel tubing, with a complex and varied structural arrangement across different sections. The box-type frame members have a maximum cross-section of 3591mm × 3591mm × 26920mm. The main members of the large-span integral frame are made of rhomboid square tubing SHS220*12 and SHS150*8, while the secondary members are made of rhomboid square tubing SHS150*6, SHS90*6, CHS76*6, and ROD25. The main material is Q355B steel. The following challenges were encountered during fabrication: the overall span of the frame structure is large, and the frame members are mainly thin-walled rhomboid square tubes and round tubes, resulting in significant deformation during assembly and welding; the frame joints are mainly intersecting joints, and the quality of the cutting of the intersecting lines of the rhomboid square tube members is a fundamental prerequisite for ensuring the quality of the rectangular frame fabrication in this project. The cutting of the intersecting joints directly affects the assembly and welding quality of the rectangular frame, therefore, the cutting quality is a key focus in the fabrication of the welding joints in this project; the overall span of the frame is large, and the end frame members are connected on-site using bolts, requiring high installation precision; this is an overseas project, requiring high precision in the fabrication of frame components and a 100% installation qualification rate; the box-type frame components are large in size, the overall assembly and fabrication site is limited, and the control of the overall frame rise and flatness is difficult.

[0004] Document CN201710143676 discloses a composite frame system with rectangular steel-concrete composite beam-column flanges and its construction method. This composite frame system consists of composite columns and composite beams connected by joints. The composite beams are horizontally positioned between the composite columns, and the joints are monolithic steel-concrete composite joints. The composite columns are cross-shaped or I-shaped composite columns with rectangular steel-concrete composite beam flanges; the composite beams are I-shaped cellular beams with rectangular steel-concrete composite beam flanges. The joints are fixed to the composite columns at their respective connection plates using high-strength bolts, and the joints are also fixed to the composite beams at their respective connection plates using high-strength bolts. This construction method does not involve separate operations, requires a large site, and inevitably causes deformation during construction, leading to failure to pass subsequent acceptance. Summary of the Invention

[0005] To address the aforementioned issues, this invention discloses a construction process for an ultra-long span rhomboid-shaped rectangular frame. This process allows for fabrication within a relatively small area, and separate fabrication enables thorough inspection, thereby improving the frame's pass rate during final assembly.

[0006] The technical solution of this invention is: a construction process for an ultra-long span rhomboid-shaped rectangular frame, characterized by the following steps:

[0007] I. Setting of allowances for frame members

[0008] Step 1: The Conveyor conveyor belt frame is a welded frame structure made of square steel tubes and diamond tubes. Welding shrinkage allowance and final end straight cut allowance are added to both ends of the main chord steel tube.

[0009] Step 2: Cut the intermediate columns and web support tubes according to the theoretical dimensions without adding any allowance;

[0010] II. Assembly jig setup for the frame

[0011] Step 1: Site preparation and leveling. Lay steel plates on the assembly site and level the top surface of the steel plates.

[0012] Step 2: Measure and lay out the ground, marking the positions of the jig supports on the steel plate with ink lines;

[0013] Step 3: Place the jig. To ensure the external dimensions during frame assembly, a jig needs to be placed on the steel plate according to the frame assembly drawings.

[0014] Step 4: Leveling the support frame. Use a precision level to measure the elevation of the top of the support. For supports with elevation deviations, leveling can be achieved by using a combination of pads and wedges. After leveling, spot weld the pads and wedges to fix them in place.

[0015] III. Welding of single frames on the left and right sides

[0016] Step 1: Before welding the rods and parts, the appearance and dimensions of the parts must be checked. When the main chord is joined together, it must be pre-cambered. The weld must be a full penetration weld and a backing plate weld is used. The reinforcing angle steel of the intersecting node is welded to the main chord with a full circle weld. The weld between the lifting lug plate and the main chord must be a full penetration weld and a backing plate weld is used.

[0017] Step 2: When assembling the single frame columns and straight web members, add welding shrinkage allowance according to the center-to-height distance. After spot welding of the columns and straight web members, perform root welding on one side and then remove the tooling measures. The weld is required to adopt the intersecting weld bevel form.

[0018] Step 3: After the welding of the single frame columns and straight web members is completed, the diagonal web members and tie rods are assembled and welded.

[0019] Step 4: Welding of the single frame as a whole. First, weld the intersecting weld between the main lower chord and the column and the straight web member. Then, weld the intersecting weld between the main upper chord and the column and the straight web member. Finally, weld from the center of the single frame towards both ends.

[0020] IV. Welding of individual end frames

[0021] Step 1: Before welding the rods and parts, the appearance and dimensions of the parts must be checked. The weld between the insert plate and the square steel tube groove must be a full penetration weld, using a backing plate weld. The weld between the support tube, the reinforcing plate, and the end column must be a partial penetration weld, using a bevel and fillet weld. The weld between the end column and the column base plate and the end sealing plate must be a full penetration weld, using a backing plate weld.

[0022] Step 2: When assembling a single frame column and upper and lower horizontal support pipes as a whole, add welding shrinkage allowance in the width direction according to the center distance. After spot welding the column and upper and lower horizontal support pipes, perform root welding on one side and then remove the tooling measures. The weld is required to adopt the intersecting weld bevel form.

[0023] Step 3: After the welding of the single frame columns and upper and lower horizontal support tubes is completed, the diagonal web members and intermediate support members are assembled and welded.

[0024] V. Overall Frame Welding

[0025] Step 1: Weld the left and right frame sections. After the welding of each frame section is completed and the NDT inspection is qualified, the frame is assembled as a whole. The upper and lower horizontal straight support pipes are assembled and welded. After spot welding of the left and right frame sections and the upper and lower horizontal straight support pipes, the tooling measures are removed after single-sided root welding. The weld is required to adopt the intersecting weld bevel form.

[0026] Step 2: Assemble and weld the upper and lower horizontal diagonal bracing pipes, and the weld seam is required to adopt the intersecting weld bevel form;

[0027] Step 3: Assemble and weld the intermediate horizontal support pipe and the round pipe diagonal support pipe. During installation, first use the steel wire auxiliary method to locate and determine the installation elevation of the intermediate horizontal support pipe, and then install the intermediate horizontal support pipe and the round pipe diagonal support pipe according to the positioning elevation. The weld is required to adopt the intersecting weld bevel form.

[0028] Step 4: Assemble and weld the frame as a whole. First, weld the intersecting welds between the lower horizontal straight support pipe and the single frame on the left and right sides. Then, weld the intersecting welds between the upper chord main pipe and the single frame on the left and right sides. Finally, weld from the center of the whole frame alternately from the bottom to the top towards both ends. After the overall frame welding is completed and passes the NDT inspection, check the overall dimensional tolerances of the frame. After meeting the specifications, cut off the end adjustment allowance.

[0029] Step 5: Assemble the end single frame. Assemble the end single frame. The weld between the main chord of the overall frame and the end single frame must be a full penetration weld, using a backing plate weld.

[0030] Step 6: Assemble the end-mounted diagonal bracing tubes. The weld seams of the end-mounted diagonal bracing tubes must adopt an intersecting weld bevel form.

[0031] Step 7: Roller bracket assembly. First, assemble and weld the angle steel of the middle roller bracket and the small assembly parts of the upper roller bracket. After the overall frame elevation is determined, install and weld the roller bracket. During installation, special attention must be paid to controlling the top elevation to meet the specifications.

[0032] Preferably, the welding shrinkage allowance at both ends and the final end straight cut allowance in step 1 of setting the allowance for frame members are 16-26mm, and the blanking tolerance in step 2 is controlled within ±2mm.

[0033] By adopting the above technical solution, adding welding shrinkage allowance can facilitate subsequent welding and make the weld surface smoother.

[0034] Preferably, in the frame assembly jig, the thickness of the steel plate in step 1 is not less than 20mm, and the jig in step 3 is mainly composed of H-beams and H-beam supports, with the H-beam supports located on both sides below the H-beams.

[0035] Preferably, in the welding of single frames on the left and right sides, the appearance dimensions that exceed the tolerance in step 1 need to be corrected, the welding shrinkage allowance in step 2 is 2mm, and in step 4, while welding the single frame, the overall arch dimension is re-measured and controlled to be 5-13mm. If the arch height is less than 5mm, flame straightening is required to raise the arch again.

[0036] By adopting the above technical solution, the shrinkage allowance and dimensions are prepared for subsequent welding.

[0037] Preferably, in the welding of the end single frame assembly, if the appearance dimensions in step 1 are out of tolerance, they need to be corrected. When cutting the square steel pipe slot of the end column, the perimeter needs to be enlarged by 2mm. In step 2, a welding shrinkage allowance of 2mm is added.

[0038] Preferably, during the overall assembly of the frame in step 1, the mid-span of each frame is used as the positioning reference line. In step 4, while welding the overall frame, the overall camber dimension is re-measured and controlled to be between 5 and 13 mm. If the camber height is less than 5 mm, flame straightening is required to raise the camber again.

[0039] Preferably, during the assembly process in step 5 of the overall frame welding, a laser theodolite is used to measure and strictly control the overall flatness of the four corner column base plates at the ends of the overall frame and the overall positioning hole spacing. Only after the self-inspection is qualified and meets the tolerance requirements can it be accepted.

[0040] By adopting the above technical solution and using a laser theodolite for measurement, it is convenient for subsequent acceptance.

[0041] The advantages of this invention are: 1. By welding the frame rods separately, transporting them separately, and finally assembling them, this invention can prevent assembly and welding deformation caused by the frame being too large, thereby improving the overall quality of the frame.

[0042] 2. This invention separates the frame for welding operations, which reduces the space occupied by the frame and lowers the site requirements. Welding operations can be carried out even in small spaces, reducing the need for additional sites and minimizing space usage.

[0043] 3. When the frame is welded separately according to the present invention, it can be inspected one by one, which improves the processing and manufacturing accuracy of the frame components. For small frame parts, it is convenient for workers to carefully inspect them, which can improve the installation qualification rate when assembling them. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the rhomboid rod rectangular frame of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of a single frame of the present invention;

[0046] Figure 3 This is a schematic diagram of the end structure of the rectangular frame with rhomboid rod of the present invention;

[0047] Figure 4 This is a schematic diagram of the middle structure of the rhomboid rod rectangular frame of the present invention;

[0048] Figure 5 This is a schematic diagram of the structure of a single frame column of the present invention;

[0049] Figure 6 This is a schematic diagram of the structure of the tire frame of the present invention.

[0050] The components include: 1. reinforcing angle steel, 2. reinforcing plate, 3. lifting lug plate, 4. single frame column, 5. straight web member, 6. diagonal web member, 7. tie rod, 8. lower chord, 9. upper chord, 10. roller bracket, 11. insert plate, 12. cladding plate, 13. column base plate, 14. end cap plate, 15. end column, 16. roller bracket angle steel, 17. intermediate strut, 18. upper and lower horizontal straight struts, 19. left and right frame members, 20. intermediate horizontal strut, 21. round pipe diagonal strut, 22. rear-mounted diagonal strut, 23. H-beam, 24. H-beam support. Detailed Implementation

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0052] like Figure 1-6 As shown, this invention discloses a construction process for an ultra-long span rhomboid rod rectangular frame.

[0053] The technical solution of this invention is: a construction process for an ultra-long span rhomboid-shaped rectangular frame, characterized by the following steps:

[0054] I. Setting of allowances for frame members

[0055] Step 1: The Conveyor conveyor belt frame is a welded frame structure made of square steel tubes and diamond tubes. Welding shrinkage allowance and final end straight cut allowance are added to both ends of the main chord steel tube. The welding shrinkage allowance and final end straight cut allowance at both ends are 16-26mm.

[0056] Step 2: The intermediate column and web support tube are cut according to the theoretical size without adding any allowance. The cutting tolerance is controlled within ±2mm. Adding welding shrinkage allowance can facilitate the subsequent welding process and make the weld surface smoother.

[0057] II. Assembly jig setup for the frame

[0058] Step 1: Site preparation and leveling. Lay steel plates on the assembly site and level the upper surface of the steel plates. The thickness of the steel plates shall not be less than 20mm. The jig in Step 3 mainly consists of H-beam steel beams 23 and H-beam supports 24. The H-beam supports 24 are located on both sides below the H-beam steel beams 23.

[0059] Step 2: Measure and lay out the ground, marking the positions of the jig supports on the steel plate with ink lines;

[0060] Step 3: Place the jig. To ensure the external dimensions during frame assembly, a jig needs to be placed on the steel plate according to the frame assembly drawings.

[0061] Step 4: Leveling the support frame. Use a precision level to measure the elevation of the top of the support. For supports with elevation deviations, leveling can be achieved by using a combination of pads and wedges. After leveling, spot weld the pads and wedges to fix them in place.

[0062] III. Welding of single frames on the left and right sides

[0063] Step 1: Before welding the rods and parts, the appearance and dimensions of the parts must be checked. When the main chord is joined, it must be pre-cambered. The weld must be a full penetration weld and a backing plate weld. The reinforcing angle steel 1 at the intersection node and the main chord must be welded with a full circle weld. The weld between the lifting lug plate 3 and the main chord must be a full penetration weld and a backing plate weld. Any parts with out-of-tolerance appearance and dimensions must be corrected.

[0064] Step 2: When assembling the single frame column 4 and straight web member 5, add welding shrinkage allowance in the height direction according to the center distance. After spot welding of the column and straight web member 5, perform root welding on one side and then remove the tooling measures. The weld is required to adopt the intersecting weld bevel form, and the welding shrinkage allowance is 2mm.

[0065] Step 3: After the single frame column 4 and straight web member 5 are welded, assemble and weld the diagonal web member 6 and tie rod 7;

[0066] Step 4: Welding of the single frame as a whole. First, weld the intersecting weld between the main pipe of the lower chord 8 and the column and the straight web member 5. Then, weld the intersecting weld between the main pipe of the upper chord 9 and the column and the straight web member 5. Finally, weld from the center of the single frame to both ends. While welding the single frame, re-measure the overall arch size and control it to 5-13mm. If the arch height is less than 5mm, flame straightening is required to raise the arch again.

[0067] IV. Welding of individual end frames

[0068] Step 1: Before welding the rods and parts, the appearance and dimensions of the parts must be checked. The weld between the insert plate 11 and the square steel tube slot must be a full penetration weld, using a backing plate weld. The weld between the support tube and the reinforcing plate 2 and the end column 15 is a partial penetration weld, using a bevel and fillet weld. The weld between the end column 15 and the column base plate 13 and the end sealing plate 14 must be a full penetration weld, using a backing plate weld. Any parts with out-of-tolerance appearance must be corrected. When cutting the square steel tube slot of the end column 15, the perimeter must be enlarged by 2mm.

[0069] Step 2: When assembling the single frame column 4 and the upper and lower horizontal support tubes 18 as a whole, add welding shrinkage allowance in the width direction of the center distance. After spot welding of the column and the upper and lower horizontal support tubes 18, remove the tooling measures after single-sided root welding. The weld is required to adopt the intersecting weld bevel form, and the welding shrinkage allowance is 2mm.

[0070] Step 3: After the single frame column 4 and the upper and lower horizontal support tubes 18 are welded, the diagonal web members 6 and the intermediate support members 17 are assembled and welded.

[0071] V. Overall Frame Welding

[0072] Step 1: Weld the left and right frame sections. After the welding of a single frame section is completed and passes the NDT inspection, the frame is assembled as a whole. The upper and lower horizontal straight support pipes 18, the left and right frame sections 19 and the upper and lower horizontal straight support pipes 18 are spot welded and then the root pass is welded on one side. After that, the tooling measures are removed. The welds are required to adopt the intersecting weld bevel form. When assembling the frame as a whole, the mid-span of the single frame section is used as the positioning reference line.

[0073] Step 2: Assemble and weld the upper and lower horizontal diagonal bracing pipes, and the weld seam is required to adopt the intersecting weld bevel form;

[0074] Step 3: Assemble and weld the intermediate horizontal support tube 20 and the round tube diagonal support tube 21. During installation, first use the steel wire auxiliary method to locate and determine the installation elevation of the intermediate horizontal support tube, and then install the intermediate horizontal support tube 20 and the round tube diagonal support tube 21 according to the positioning elevation. The weld is required to adopt the intersecting weld bevel form.

[0075] Step 4: Assemble and weld the frame as a whole. First, weld the intersecting welds between the lower horizontal straight support pipe and the left and right single frame 19. Then, weld the intersecting welds between the upper chord 8 main pipe and the left and right single frame 19. Finally, weld from the center of the whole frame alternately from the bottom to the two ends. After the whole frame welding is completed and the NDT inspection is qualified, the overall dimensional tolerance of the frame is checked. After meeting the specification requirements, the end adjustment allowance is cut off. While the whole frame is being welded, the overall camber dimension is re-measured and controlled to be 5~13mm. If the camber height is less than 5mm, flame straightening is required to raise the camber again.

[0076] Step 5: Assembly of end single frames. When assembling the end single frames, the welds between the main chord of the overall frame and the end single frames must be full penetration welds, using backing plate welding. During assembly, a laser theodolite is used to measure and strictly control the overall flatness of the four corner column base plates at the end of the overall frame and the overall positioning hole spacing. Only after the self-inspection is qualified and the tolerance requirements are met can it be accepted. The measurement is carried out by a laser theodolite to facilitate the later acceptance.

[0077] Step 6: Assemble the end-mounted diagonal bracing tube 22. The weld of the end-mounted diagonal bracing tube 22 is required to adopt the intersecting weld bevel form.

[0078] Step 7: Roller bracket assembly. First, assemble and weld the middle roller bracket angle steel 16 and the upper roller bracket 10 small assembly parts. After the overall frame elevation is determined, install and weld the roller brackets. During installation, special attention must be paid to controlling the top surface elevation to meet the specifications.

[0079] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention; the objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A construction process for an ultra-long span rhomboid-shaped rectangular frame, characterized in that, Includes the following steps: I. Setting of allowances for frame members Step 1: The Conveyor conveyor belt frame is a welded frame structure made of square steel tubes and diamond tubes. Welding shrinkage allowance and final end straight cut allowance are added to both ends of the main chord steel tube. Step 2: Cut the intermediate columns and web support tubes according to the theoretical dimensions without adding any allowance; II. Assembly jig setup for the frame Step 1: Site preparation and leveling. Lay steel plates on the assembly site and level the top surface of the steel plates. Step 2: Measure and lay out the lines, i.e., mark the positions of the jig supports on the steel plate with ink lines; Step 3: Place the jig. To ensure the external dimensions during frame assembly, a jig needs to be placed on the steel plate according to the frame assembly drawings. Step 4: Leveling the support frame. Use a precision level to measure the elevation of the top of the support. For supports with elevation deviations, leveling can be achieved by using a combination of pads and wedges. After leveling, spot weld the pads and wedges to fix them in place. III. Welding of single frames on the left and right sides Step 1: Before welding the rods and parts, the appearance and dimensions of the parts must be checked. When the main chord is joined together, it must be pre-cambered. The weld must be a full penetration weld and a backing plate weld is used. The reinforcing angle steel of the intersecting node is welded to the main chord with a full circle weld. The weld between the lifting lug plate and the main chord must be a full penetration weld and a backing plate weld is used. Step 2: When assembling the single frame columns and straight web members, add welding shrinkage allowance according to the center-to-height distance. After spot welding of the columns and straight web members, perform root welding on one side and then remove the tooling measures. The weld is required to adopt the intersecting weld bevel form. Step 3: After the welding of the single frame columns and straight web members is completed, the diagonal web members and tie rods are assembled and welded. Step 4: Welding of the single frame as a whole. First, weld the intersecting weld between the main lower chord and the column and the straight web member. Then, weld the intersecting weld between the main upper chord and the column and the straight web member. Finally, weld from the center of the single frame towards both ends. IV. Welding of individual end frames Step 1: Before welding the rods and parts, the appearance and dimensions of the parts must be checked. The weld between the insert plate and the square steel tube groove must be a full penetration weld, using a backing plate weld. The weld between the support tube, the reinforcing plate, and the end column must be a partial penetration weld, using a bevel and fillet weld. The weld between the end column and the column base plate and the end sealing plate must be a full penetration weld, using a backing plate weld. Step 2: When assembling a single frame column and upper and lower horizontal support pipes as a whole, add welding shrinkage allowance in the width direction according to the center distance. After spot welding the column and upper and lower horizontal support pipes, perform root welding on one side and then remove the tooling measures. The weld is required to adopt the intersecting weld bevel form. Step 3: After the welding of the single frame columns and upper and lower horizontal support tubes is completed, the diagonal web members and intermediate support members are assembled and welded. V. Overall Frame Welding Step 1: Weld the left and right frame sections. After the welding of each frame section is completed and the NDT inspection is qualified, the frame is assembled as a whole. The upper and lower horizontal straight support pipes are assembled and welded. After spot welding of the left and right frame sections and the upper and lower horizontal straight support pipes, the tooling measures are removed after single-sided root welding. The weld is required to adopt the intersecting weld bevel form. Step 2: Assemble and weld the upper and lower horizontal diagonal bracing pipes, and the weld seam is required to adopt the intersecting weld bevel form; Step 3: Assemble and weld the intermediate horizontal support pipe and the round pipe diagonal support pipe. During installation, first use the steel wire auxiliary method to locate and determine the installation elevation of the intermediate horizontal support pipe, and then install the intermediate horizontal support pipe and the round pipe diagonal support pipe according to the positioning elevation. The weld is required to adopt the intersecting weld bevel form. Step 4: Assemble and weld the frame as a whole. First, weld the intersecting welds between the lower horizontal straight support pipe and the single frame on the left and right sides. Then, weld the intersecting welds between the upper chord main pipe and the single frame on the left and right sides. Finally, weld from the center of the whole frame alternately from the bottom to the top towards both ends. After the overall frame welding is completed and passes the NDT inspection, check the overall dimensional tolerances of the frame. After meeting the specifications, cut off the end adjustment allowance. Step 5: Assemble the end single frame. Assemble the end single frame. The weld between the main chord of the overall frame and the end single frame must be a full penetration weld, using a backing plate weld. Step 6: Assemble the end-mounted diagonal bracing tubes. The weld seams of the end-mounted diagonal bracing tubes must adopt an intersecting weld bevel form. Step 7: Roller bracket assembly. First, assemble and weld the angle steel of the middle roller bracket and the small assembly parts of the upper roller bracket. After the overall frame elevation is determined, install and weld the roller bracket. During installation, special attention must be paid to controlling the top elevation to meet the specifications.

2. The construction process of an ultra-long span rhomboid-shaped rectangular frame according to claim 1, characterized in that: The welding shrinkage allowance at both ends and the final end straight cut allowance in step 1 of the frame member allowance setting are 16-26mm, and the blanking tolerance in step 2 is controlled within ±2mm.

3. The construction process for an ultra-long span rhomboid-shaped rectangular frame according to claim 1, characterized in that: In the assembly jig of the frame, the thickness of the steel plate in step 1 is not less than 20mm, and the jig in step 3 is mainly composed of H-shaped steel beams and H-shaped steel supports, with the H-shaped steel supports located on both sides below the H-shaped steel beams.

4. The construction process of an ultra-long span rhomboid-shaped rectangular frame according to claim 1, characterized in that: In the welding of the left and right single frames, any dimensions that exceed the tolerance in step 1 need to be corrected. The welding shrinkage allowance in step 2 is 2mm. In step 4, while welding the single frame, the overall arch dimension is re-measured and controlled to be between 5-13mm. If the arch height is less than 5mm, flame straightening is required to raise the arch again.

5. The construction process for an ultra-long span rhomboid-shaped rectangular frame according to claim 1, characterized in that: In the welding of the end single frame assembly, if the appearance dimensions in step 1 are out of tolerance, they need to be corrected. When cutting the square steel pipe slot of the end column, the perimeter needs to be enlarged by 2mm. In step 2, a welding shrinkage allowance of 2mm is added.

6. The construction process of an ultra-long span rhomboid-shaped rectangular frame according to claim 1, characterized in that: In the overall frame assembly welding process, during step 1, the mid-span of each frame is used as the positioning reference line. In step 4, while welding the overall frame, the overall camber dimension is re-measured and controlled to be between 5 and 13 mm. If the camber height is less than 5 mm, flame straightening is required to raise the camber again.

7. The construction process of an ultra-long span rhomboid-shaped rectangular frame according to claim 1, characterized in that: In step 5 of the overall frame welding process, a laser theodolite is used to measure and strictly control the overall flatness of the four corner column base plates at the ends of the overall frame and the overall positioning hole distance. Only after the self-inspection is qualified and meets the tolerance requirements can it be accepted.

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