A splicing and assembling method for large-sized asymmetric special-shaped steel arch seats

Abstract

A method for splicing and assembling a large-sized asymmetric special-shaped steel arch seat. The method decomposes the large-sized asymmetric special-shaped steel arch seat into several parts, namely, inner and outer web units of the support body, bearing plate units of the support body, bottom plate units of the support body, top plate units of the support body, T-shaped crossbeams, arch rib connection segments, and support segments. After separately preparing the inner and outer web units of the support body, bearing plate units of the support body, bottom plate units of the support body, top plate units of the support body, T-shaped crossbeams, arch rib connection segments, and support segments, the welding sequence is optimized through three-dimensional evolution to reduce the welding difficulty and overall assembly difficulty of the large-sized steel arch seat and ensure the accuracy of each link. This method has clear thinking, definite goals, and is simple and convenient to operate, effectively improving the manufacturing accuracy of the steel arch seat.

Description

Technical Field

[0001] The present invention relates to a splicing and assembling method for large-sized asymmetric special-shaped steel arch seats, belonging to the technical field of bridge engineering. Background Art

[0002] In bridge engineering, the steel arch seats used in arch bridges need to be assembled and spliced.

[0003] The commonly used splicing methods are arc welding and bolt connection. Arc welding is to weld with a manual operation electrode, and bolt connection is to anchor steel components together by reserving holes and using bolts. For large-sized asymmetric special-shaped steel arch seats, the internal structure is complex and the precision requirement is high. There is not enough operating space for arc welding, and the precision cannot be guaranteed. Using bolt connection will make the components of large-sized asymmetric special-shaped steel arch seats more complex, inconvenient to operate, and increase the workload.

[0004] Therefore, it is difficult to adopt the above two splicing methods for large-sized asymmetric special-shaped steel arch seats. Summary of the Invention

[0005] The purpose of the present invention is to propose a splicing and assembling method for large-sized asymmetric special-shaped steel arch seats in order to solve the splicing problem of large-sized asymmetric special-shaped steel arch seats.

[0006] The technical solution implemented by the present invention is as follows. A splicing and assembling method for large-sized asymmetric special-shaped steel arch seats divides the large-sized asymmetric special-shaped steel arch seats into several small parts for welding and finally makes an overall splicing. The several small parts include the inner and outer web units of the support body, the bearing plate unit of the support body, the bottom plate unit of the support body, the top plate unit of the support body, the T-shaped crossbeam, the arch rib connection section and the support section. After separately preparing the inner and outer web units of the support body, the bearing plate unit of the support body, the bottom plate unit of the support body, the top plate unit of the support body, the T-shaped crossbeam, the arch rib connection section and the support section, an overall splicing is carried out by using three-dimensional modeling to optimize the welding sequence. For full penetration welds, symmetric welding is adopted, and the total station is used throughout to accurately position the coordinates of each corner point of the steel arch seat.

[0007] The inner and outer web units of the support body include the inner and outer webs of the support body and the first stiffeners. The inner and outer webs of the support body are long trapezoidal steel plate structures, with the height of the trapezoid being the length direction and the two bases of the trapezoid being the width direction. The first stiffeners include long stiffeners and short stiffeners. 6 long stiffeners are evenly distributed in the length direction of the inner and outer webs of the support body, and 8 short stiffeners with different lengths are distributed in the width direction of the inner and outer webs of the support body. The intersection of the short stiffeners and the long stiffeners is in a cross shape. The longitudinal baseline of the inner and outer webs of the support body is the symmetry line of the inner and outer web units of the support body.

[0008] The support body bearing plate unit includes a support body bearing plate and stiffening ribs; the support body bearing plate is a rectangular steel plate structure, with 5 long stiffening ribs uniformly arranged in the length direction of the support body bearing plate, and short stiffening ribs uniformly arranged in the width direction. The intersection of the short stiffening ribs and the long first stiffening ribs is a perpendicular cross; taking the middle long stiffening rib as the longitudinal baseline of the support body bearing plate, and the middle long stiffening rib as the symmetry line of the support body bearing plate.

[0009] The support body bottom plate unit includes a support body bottom plate and stiffening ribs; the support body bottom plate is a rectangular steel plate structure, with a long stiffening rib perpendicular to the bottom plate length installed in the middle of the length direction of the support body bottom plate, and short stiffening ribs perpendicular to the bottom plate length installed at both ends of the length direction of the support body bottom plate; rectangular and strip-shaped openings are provided on the support body bottom plate. Taking the longitudinal baseline of the support body bottom plate as the reference, both sides in the width direction of the support body bottom plate are in a symmetrical state.

[0010] The support body top plate unit includes a support body top plate and first stiffening ribs; the support body top plate is a rectangular steel plate structure. In the length direction of the support body top plate, 5 stiffening ribs perpendicular to the length direction of the support body top plate are installed, with one piece at 10 cm from each end and 3 pieces evenly distributed in the middle; on one side in the width direction of the support body top plate, longitudinal stiffening ribs are provided between the 5 stiffening ribs.

[0011] The T-shaped cross beam includes a rectangular cross beam including a T-shaped cross beam web, T-shaped cross beam stiffening ribs, and T-shaped cross beam flange plates; the T-shaped cross beam web is a rectangular steel plate structure, with 9 T-shaped cross beam stiffening ribs uniformly installed in the length direction of the T-shaped cross beam web, and the T-shaped cross beam stiffening ribs are perpendicularly connected to the T-shaped cross beam web in the length direction; on one side in the width direction of the T-shaped cross beam web, a T-shaped cross beam flange plate is vertically installed; two rows of round holes are distributed on the T-shaped cross beam web between adjacent two T-shaped cross beam stiffening ribs, and the number of round holes in each row is 7, evenly distributed.

[0012] The arch rib connection section includes an arch rib connection section top plate, an arch rib connection section bin partition plate, an arch rib connection section bottom plate, an arch rib connection section partition plate, an arch rib connection section inner web, an arch rib connection section outer web, and a second stiffening rib; the arch rib connection section top plate and the arch rib connection section bottom plate are respectively vertically connected to both ends of the arch rib connection section outer web in the length direction, forming three faces of a cuboid; the length and width of the arch rib connection section top plate and the arch rib connection section bottom plate are equal, and the length of the arch rib connection section top plate is equal to the width of the arch rib connection section outer web; two mutually parallel arch rib connection section partition plates are installed between the arch rib connection section top plate and the arch rib connection section bottom plate, the length of the arch rib connection section partition plate is the distance between the arch rib connection section top plate and the arch rib connection section bottom plate, and the width of the arch rib connection section partition plate is the same as the width of the arch rib connection section top plate; two mutually parallel arch rib connection section inner webs and two mutually parallel arch rib connection section bin partition plates are installed in the space between the arch rib connection section top plate, the arch rib connection section bottom plate, the arch rib connection section outer web, and the arch rib connection section bin partition plate; the arch rib connection section inner web is parallel to the arch rib connection section outer web and is respectively vertically connected to the arch rib connection section top plate, the arch rib connection section bottom plate, and the arch rib connection section bin partition plate; the arch rib connection section bin partition plate is parallel to the arch rib connection section top plate or the arch rib connection section bottom plate, is perpendicular to the arch rib connection section bin partition plate, and perpendicularly intersects with the arch rib connection section inner web; the arch rib connection section bin partition plate divides the space between the arch rib connection section inner web and the arch rib connection section outer web into three spaces, and second stiffening ribs are respectively arranged on the arch rib connection section outer webs of the three spaces, and the second stiffening ribs are parallel to the arch rib connection section top plate.

[0013] The support section includes a support section top plate, a support section outer web, a support section inner web, a support section bottom plate, a support section partition plate, a support section transverse partition plate, and a third stiffening rib.

[0014] The support section top plate is a support section top plate unit, the support section outer web and the support section inner web are support body inner and outer web units, the support section bottom plate is a support section bottom plate unit, and the support section transverse partition plate is installed with third stiffening ribs arranged vertically and horizontally.

[0015] The length of the support section top plate is the same as the width of one side of the support section bottom plate; the upper bottom width of the support section outer web is the same as the support section top plate, and the lower bottom width is the same as the width of the other side of the support section bottom plate; a trapezoidal prism is formed by the support section top plate, the support section bottom plate, and two support section outer webs; inside the trapezoidal prism, two parallel support section inner webs are distributed between the two support section outer webs, and the support section inner web has the same shape and size as the support section outer web; a support section transverse partition plate is installed horizontally between the two support section inner webs, and the support section transverse partition plate is fixedly connected to the two support section inner webs; a support section partition plate is also installed vertically between the two support section inner webs, and the support section transverse partition plate is respectively fixedly connected to the support section top plate and the support section transverse partition plate.

[0016] The special-shaped steel arch seat includes an arch rib connection section, a support section unit, a bearing plate unit, and a lower cross beam. The support section unit is a trapezoidal frustum, and two arch rib connection sections are respectively installed on the inclined surfaces on both sides of the support section unit through the bearing plate unit; the bottom of the support section unit is installed on the lower cross beam; the support section unit includes an inner and outer web unit of the support body, a bearing plate unit of the support body, a bottom plate unit of the support body, and a top plate unit of the support body.

[0017] A splicing and assembly process method for a large-size asymmetric special-shaped steel arch seat is as follows:

[0018] (1) Prepare the inner and outer web units of the support body, the bearing plate unit of the support body, the top plate unit of the support body, and the bottom plate unit of the support body and the inner and outer web units of the support body respectively.

[0019] After the steel plate is pretreated, cut the material, draw the horizontal and vertical reference lines, and flame cut the butt slope groove; assemble the components according to the baseline, draw the position lines of the stiffeners according to the lines; weld the stiffeners according to the lines, correct the deformation, and focus on controlling the flatness and the perpendicularity of the stiffeners; after correcting the deformation, revise the horizontal and vertical baselines, and transfer to assembly after passing the inspection.

[0020] (2) Prepare the T-shaped cross beam; after the steel plate is pretreated, cut the material, flame cut the upper end groove of the web with the straight edge at the lower end of the web of the T-shaped cross beam as the reference, draw the horizontal reference line, and draw the assembly position lines of the stiffeners of the T-shaped cross beam; tightly assemble the T-shaped structure composed of the web of the T-shaped cross beam and the flange plate of the T-shaped cross beam, and perform submerged arc welding to trim the deformation; weld the stiffeners of the T-shaped cross beam according to the lines, correct the deformation, and focus on controlling the flatness and the perpendicularity of the stiffeners of the T-shaped cross beam, and transfer to assembly after passing the inspection.

[0021] (3) Prepare the arch rib connection section; sequentially weld the partition plates of the arch rib connection section, the bin partition plates of the arch rib connection section, the top plate of the arch rib connection section, the bottom plate of the arch rib connection section, and the inner web of the arch rib connection section with the outer web of the arch rib connection section as the reference surface; lift the outer web unit of the arch rib connection section into the mold and lay it flat, measure the elevation value of the web to ensure the web is horizontal; draw the assembly position lines of the partition plates and the bin partition plates of the arch rib connection section with the vertical baseline of the web as the reference; lift the top plate unit and the bottom plate unit of the arch rib connection section to the designated positions respectively with a crane, align them with the outer web of the arch rib connection section, firmly fix them with jacks, and make them close to the outer web and the partition plates of the arch rib connection section, and weld; after welding is completed, perform sandblasting and painting, and participate in the overall assembly of the segment.

[0022] (4)Preparation of the support section: Lay the bottom plate of the support section flat, measure the elevation value of the bottom plate of the support section to ensure its horizontality; draw the assembly lines of the inner web, outer web, transverse diaphragm, and bearing plate of the support section based on the longitudinal and transverse benchmarks on the bottom plate of the support section; assemble the bottom plate of the support section and the transverse diaphragm unit according to the lines; position the bottom plate unit of the support section, the inner and outer webs of the support section, the bearing plate unit of the support section, and the top plate unit of the support section respectively; draw the arch rib connection section based on the longitudinal and transverse baselines on the bearing plate of the support section, and install the matching parts.

[0023] (5)Assembly of the asymmetric special-shaped steel arch seat: Position the lower cross beam on the special steel arch seat assembly jig in the wharf; use a floating crane to hoist the support body onto the jig, ensuring that its longitudinal and transverse baselines are aligned with those of the jig, and at the same time leveling the horizontal baseline of the support body unit; use a floating crane to hoist the arch rib connection section and directly place the lower part on the support matching parts of the support body. Use a three-dimensional measuring instrument and a jack to finely adjust the connection section to ensure the position of the measuring point position line of the upper structure, with a deviation not exceeding 2 mm; after passing the inspection, weld the weld between the connection body and the support body. After flaw detection, grind the weld smoothly and touch up the painting.

[0024] The beneficial effects of the present invention are as follows. In the present invention, the stressed steel plates of the large-sized asymmetric special-shaped steel arch seat are all thick plates, with many components and dense welds, and high requirements for welds. However, the welding space is narrow and the operation difficulty is high. The steel arch seat component has large structural dimensions, irregular shapes, and a large overall weight, making it difficult to manufacture. Arch rib segments are arranged on both sides of the steel arch seat, and the accuracy control of the spatial angle directly affects the alignment of the arch rib, with great difficulty in accuracy control. The present invention can provide a steel arch seat splicing method with convenient operation, high quality, and high precision. Description of the Drawings

[0025] Figure 1 It is a process flow chart of a large-sized asymmetric special-shaped steel arch seat;

[0026] Figure 2 It is a simplified diagram of the inner and outer web units of the support body;

[0027] Figure 3 It is a simplified diagram of the bearing plate unit of the support body;

[0028] Figure 4 It is a simplified diagram of the bottom plate unit of the support body;

[0029] Figure 5 It is a simplified diagram of the top plate unit of the support body;

[0030] Figure 6 It is a simplified diagram of the T-shaped cross beam;

[0031] Figure 7 It is a simplified diagram of the arch rib connection section;

[0032] Figure 8It is a simplified diagram of the support section;

[0033] Figure 9 This is a schematic diagram of the steel arch seat;

[0034] In the figure, 1 is the first stiffening rib; 2 is the horizontal base line of the inner and outer webs of the supporting body; 3 is the main body of the inner and outer webs of the supporting body; 4 is the longitudinal base line of the inner and outer webs of the supporting body; 5 is the horizontal base line; 6 is the web of the T-beam; 7 is the stiffening rib of the T-beam; 8 is the flange plate of the T-beam; 9 is the top plate of the arch rib connecting section; 10 is the partition plate of the arch rib connecting section; 11 is the bottom plate of the arch rib connecting section; 12 is the partition plate of the arch rib connecting section; 13 is the inner web of the arch rib connecting section; 14 is the second stiffening rib; 15 is the outer web of the arch rib connecting section; 16 is the top plate of the supporting section; 17 is the outer web of the supporting section; 18 is the inner web of the supporting section; 19 is the bottom plate of the supporting section; 20 is the partition plate of the supporting section; 21 is the third stiffening rib; 22 is the transverse partition plate of the supporting section; 23 is the arch foot connecting section; 24 is the supporting body unit; 25 is the pressure plate; 26 is the lower beam. Implementation

[0035] like Figure 1 As shown, this embodiment is a method for splicing and assembling a large-size asymmetric special-shaped steel arch seat, and the construction steps are as follows:

[0036] The first step is to prepare the inner and outer web units of the support body, the pressure plate unit of the support body, the bottom plate unit of the support body and the top plate unit of the support body respectively.

[0037] like Figure 2 Shown are the inner and outer web elements of the support body.

[0038] After the steel plate is pre-treated, it is cut, the horizontal baseline 2 of the inner and outer web of the support body and the longitudinal baseline 4 of the inner and outer web of the support body are marked, and the butt bevel is flame cut. The components are assembled according to the baseline, and the stiffening rib position line is marked according to the line. The stiffening rib 1 is welded according to the line, and the deformation is corrected, focusing on controlling the flatness and verticality of the stiffening rib. After the deformation is corrected, the horizontal baseline 2 of the inner and outer web of the support body and the longitudinal baseline 4 of the inner and outer web of the support body are corrected, and they are handed over for assembly after passing the test.

[0039] like Figure 3 The support body pressure plate unit shown, such as Figure 4 The support base unit shown in FIG. Figure 5 The method and steps of the top plate unit of the support body are the same as those of the inner and outer web plate units of the support body, and will not be repeated here.

[0040] Step 2: Figure 6 As shown, prepare the T-beam.

[0041] After the steel plate is pretreated, it is blanked. Taking the straight edge at the lower end of the web 6 of the T-shaped crossbeam as the reference, the groove at the upper end of the web 6 of the T-shaped crossbeam is flame cut, the transverse baseline 5 is marked, and the assembly position line of the stiffener 7 of the T-shaped crossbeam is marked. The T-shaped structure composed of the web 6 of the T-shaped crossbeam and the flange plate 8 of the T-shaped crossbeam is tightly assembled and welded by submerged arc welding, and the deformation is trimmed. The stiffener 7 of the T-shaped crossbeam is welded according to the line, the deformation is corrected, and the flatness and the perpendicularity of the stiffener are mainly controlled. After passing the inspection, it is transferred for assembly.

[0042] Step 3: As Figure 7 shown, prepare the arch rib connection section.

[0043] Taking the outer web 15 of the arch rib connection section as the reference plane, sequentially weld the partition plate 12 of the arch rib connection section, the bin partition plate 10 of the arch rib connection section, the top plate 9 of the arch rib connection section, the bottom plate 11 of the arch rib connection section, and the inner web 13 of the arch rib connection section. Lift the unit of the outer web 15 of the arch rib connection section into the jig and lay it flat, measure the elevation value of the web to ensure the web is horizontal. Taking the vertical baseline of the web as the reference, mark the assembly position line of the partition plate and the assembly position line of the bin partition plate 10 of the arch rib connection section. Lift the units of the top plate 9 and the bottom plate 11 of the arch rib connection section to the designated positions by crane respectively, align them with the outer web 15 of the arch rib connection section, fix them firmly with jacks, and make them close to the outer web 15 and the partition plate 12 of the arch rib connection section, then weld. After welding, sandblast and paint, and participate in the overall assembly of the segment.

[0044] Step 4: As Figure 8 shown, prepare the support section.

[0045] Lay the bottom plate 19 of the support section flat, measure the elevation value of the bottom plate to ensure the bottom plate of the support section is horizontal. Taking the longitudinal and transverse references on the bottom plate of the support section, mark the assembly lines of the inner web 18 of the support section, the outer web 17 of the support section, the transverse diaphragm 22 of the support section, and the bearing plate 25 of the support section.

[0046] Assemble the bottom plate 19 of the support section and the transverse diaphragm 22 according to the line: mainly control the transverse position and inclination of the transverse diaphragm 22 of the support section, and carry out tack welding after passing the inspection.

[0047] Positioning of the unit of the bottom plate 19 of the support section: Taking the longitudinal and transverse baselines of the bottom plate of the support section as the reference, assemble the bottom plate 19 of the support section according to the line, and mainly control the transverse position, longitudinal position and elevation value of the bottom plate 19 of the support section. Temporary positioning supports for the bottom plate of the support section are set at both ends of the bottom plate during assembly.

[0048] Positioning of the inner web 18 and the outer web 17 of the support section: Lift the two web units to the designated positions by crane respectively, align their transverse baselines with the transverse baseline on the bottom plate to complete the longitudinal positioning; for the transverse positioning, take the web position line on the bottom plate as the reference, and at the same time fix them firmly with jacks and make them close to the bottom plate 19 and the transverse diaphragm 22 of the support section; position templates for the webs are set at both ends of the bottom plate to facilitate the control of the positioning accuracy of the two side webs.

[0049] Positioning of the bearing plate 25 of the support section: Hoist two bearing plates 25 of the support section into the mold respectively, align their vertical baselines with the longitudinal and transverse baselines on the support section bottom plate 19 to complete longitudinal and transverse positioning; at the same time, firmly jack them and make them close to the support section bottom plate 19 and the support section transverse diaphragm 22. After welding, grind the welds smoothly.

[0050] Positioning of the top plate 16 of the support section: Hoist the top plate 16 unit of the support section onto the support section partition 20, align its baseline with the vertical baseline of the bearing plate 25 unit of the support section to complete longitudinal positioning; for transverse positioning, take the transverse baseline as the reference and position according to the sketch shown; use a total station to measure the elevation of the top plate, and after passing the inspection, carry out tack welding. Pay attention to strengthening safety protection. After welding, grind the welds smoothly.

[0051] Installation of matching parts: Mark the installation of the matching parts of the arch rib connecting section 23 based on the longitudinal and transverse baselines on the bearing plate 25 of the support section.

[0052] Step 5, as Figure 9 shown, assemble the steel arch seat.

[0053] Position the lower crossbeam 26 on the special steel arch seat assembly jig at the wharf, and ensure that the transverse and longitudinal baselines of the lower crossbeam 26 are aligned with the transverse and longitudinal baselines on the jig. Add safety protection supports to ensure the stability of the crossbeam.

[0054] Positioning of the support body 24 unit: Use a floating crane to hoist the support body onto the jig, ensure that its longitudinal and transverse baselines are aligned with those of the jig, and at the same time level the horizontal baseline of the support body 24 to ensure that the levelness of the horizontal baseline is not greater than 2 mm. Weld the weld between the support body and the lower crossbeam, and after flaw detection, grind the welds smoothly.

[0055] Positioning of the arch rib connecting section 23: Use a floating crane to hoist the arch rib connecting section, directly place the lower part on the support matching parts of the support body, and use a three-dimensional measuring instrument and a jack to finely adjust the connecting section to ensure the position of the measuring point position line of the upper structure, with a deviation not exceeding 2 mm. After passing the inspection, weld the weld between the connecting body and the support body, and after flaw detection, grind the welds smoothly and touch up the painting.

Claims

1. A method for splicing and assembling a large-sized asymmetric special-shaped steel arch seat, characterized in that, The method divides the large-sized asymmetric special-shaped steel arch seat into several small parts for welding and finally assembles them as a whole; the several small parts include the inner and outer web units of the support body, the bearing plate unit of the support body, the bottom plate unit of the support body, the top plate unit of the support body, the T-shaped cross beam, the arch rib connection section and the support section; after separately preparing the inner and outer web units of the support body, the bearing plate unit of the support body, the bottom plate unit of the support body, the top plate unit of the support body, the T-shaped cross beam, the arch rib connection section and the support section, overall assembly is carried out by using 3D modeling to optimize the welding sequence. For full-penetration welds, symmetric welding is adopted, and the total station is used throughout to accurately position the coordinates of each corner point of the steel arch seat; The steps of the method are as follows: (1) Preparation of the inner and outer web units of the support body, the bearing plate unit of the support body, the top plate unit of the support body and the bottom plate unit of the support body; the preparation method of the inner and outer web units of the support body is as follows: After the steel plate is pretreated, it is cut to size, and the transverse and longitudinal reference lines are marked, and the butt slope notch is flame-cut; the components are assembled according to the baseline, and the position lines of the stiffeners are marked according to the line; the stiffeners are welded in groups according to the line, and the deformation is corrected, with the flatness and the perpendicularity of the stiffeners being key controlled; After the deformation is corrected, the transverse and longitudinal baselines are corrected, and after passing the inspection, it is transferred for assembly; (2) Preparation of the T-shaped cross beam; after the steel plate is pretreated, it is cut to size, and with the straight edge at the lower end of the web of the T-shaped cross beam as the reference, the notch at the upper end of the web is flame-cut, the transverse reference line is marked, and the assembly position lines of the stiffeners of the T-shaped cross beam are marked; the T-shaped structure composed of the web of the T-shaped cross beam and the flange plate of the T-shaped cross beam is tightly assembled and welded by submerged arc, and the deformation is trimmed; the stiffeners of the T-shaped cross beam are welded in groups according to the line, and the deformation is corrected, with the flatness and the perpendicularity of the stiffeners of the T-shaped cross beam being key controlled. After passing the inspection, it is transferred for assembly; (3) Preparation of the arch rib connection section; with the outer web of the arch rib connection section as the reference surface, the partition plate of the arch rib connection section, the bin partition plate of the arch rib connection section, the top plate of the arch rib connection section, the bottom plate of the arch rib connection section and the inner web of the arch rib connection section are welded in sequence; the outer web unit of the arch rib connection section is hoisted into the jig and laid flat, and the elevation value of the web is measured to ensure the web is horizontal; with the vertical baseline of the web as the reference, the assembly position lines of the partition plate and the bin partition plate of the arch rib connection section are marked; the top plate unit and the bottom plate unit of the arch rib connection section are respectively hoisted to the designated positions by a crane, aligned with the outer web of the arch rib connection section, and firmly fixed with a jack, and are closely attached to the outer web and the partition plate of the arch rib connection section, and then welded; after welding is completed, sandblasting and painting are carried out, and it participates in the overall assembly of the segment; (4) Preparation of the support section: the bottom plate of the support section is laid flat, and the elevation value of the bottom plate of the support section is measured to ensure the bottom plate of the support section is horizontal; with the transverse and longitudinal references on the bottom plate of the support section as the reference, the assembly lines of the inner web, the outer web, the transverse partition plate and the bearing plate of the support section are marked; the bottom plate of the support section and the transverse partition plate unit are assembled according to the line; the bottom plate unit of the support section, the inner and outer webs of the support section, the bearing plate unit of the support section and the top plate unit of the support section are respectively positioned; with the transverse and longitudinal baselines on the bearing plate of the support section as the reference, the arch rib connection section is marked, and the matching parts are installed; (5)Asymmetric special-shaped steel arch seat splicing and assembly; position the lower crossbeam on the dedicated steel arch seat assembly jig for the wharf; use a floating crane to hoist the support body onto the jig, ensuring that its longitudinal and transverse baselines are aligned with those of the jig, and at the same time leveling the horizontal baseline of the support body unit; use a floating crane to hoist the arch rib connection section, directly place the lower part on the support matching parts of the support body, and use a three-dimensional measuring instrument and a jack to finely adjust the connection section to ensure the position of the position line of the measuring points on the upper structure, with a deviation not exceeding 2 mm; after passing the inspection, weld the weld between the connection body and the support body, and after flaw detection, grind the weld smoothly and repair the painting.

2. A method for splicing and assembling a large-sized asymmetric special-shaped steel arch seat according to claim 1, characterized in that, The inner and outer web units of the support body include the inner and outer webs of the support body and stiffeners; the inner and outer webs of the support body are long trapezoidal steel plate structures, with the height of the trapezoid in the length direction and the two bases of the trapezoid in the width direction; the stiffeners include long stiffeners and short stiffeners. Six long stiffeners are evenly distributed in the length direction of the inner and outer webs of the support body, and eight short stiffeners of different lengths are distributed in the width direction of the inner and outer webs of the support body. The intersection of the short stiffeners and the long stiffeners is in a cross shape. The longitudinal baseline of the inner and outer webs of the support body is the symmetry line of the inner and outer web units of the support body.

3. A method for splicing and assembling a large-sized asymmetric special-shaped steel arch seat according to claim 1, characterized in that The T-shaped crossbeam includes a T-shaped crossbeam web, T-shaped crossbeam stiffeners, and T-shaped crossbeam flange plates; the T-shaped crossbeam web is a rectangular steel plate structure, and nine T-shaped crossbeam stiffeners are evenly installed in the length direction of the T-shaped crossbeam web. The T-shaped crossbeam stiffeners are perpendicularly connected to the T-shaped crossbeam web in the length direction; on one side in the width direction of the T-shaped crossbeam web, a T-shaped crossbeam flange plate is perpendicularly installed; two rows of round holes are distributed on the T-shaped crossbeam web between adjacent two T-shaped crossbeam stiffeners, and the number of round holes in each row is 7, evenly distributed.

4. A method for splicing and assembling a large-sized asymmetric special-shaped steel arch seat according to claim 1, characterized in that The arch rib connection section includes an arch rib connection section top plate, arch rib connection section bulkheads, arch rib connection section bottom plate, arch rib connection section partitions, arch rib connection section inner webs, arch rib connection section outer webs, and second stiffeners; the arch rib connection section top plate and the arch rib connection section bottom plate are respectively perpendicularly connected to both ends in the length direction of the arch rib connection section outer web, forming three faces of a cuboid; the length and width of the arch rib connection section top plate and the arch rib connection section bottom plate are equal, and the length of the arch rib connection section top plate is equal to the width of the arch rib connection section outer web; two mutually parallel arch rib connection section partitions are installed between the arch rib connection section top plate and the arch rib connection section bottom plate. The length of the arch rib connection section partition is the distance between the arch rib connection section top plate and the arch rib connection section bottom plate, and the width of the arch rib connection section partition is the same as the width of the arch rib connection section top plate; two mutually parallel arch rib connection section inner webs and two mutually parallel arch rib connection section bulkheads are installed in the space between the arch rib connection section top plate, the arch rib connection section bottom plate, the arch rib connection section outer web, and the arch rib connection section bulkheads; the arch rib connection section inner webs are parallel to the arch rib connection section outer web and are respectively perpendicularly connected to the arch rib connection section top plate, the arch rib connection section bottom plate, and the arch rib connection section bulkheads; the arch rib connection section bulkheads are parallel to the arch rib connection section top plate or the arch rib connection section bottom plate, perpendicular to the arch rib connection section bulkheads, and perpendicularly intersect with the arch rib connection section inner webs. The bulkhead of the arch rib connection section divides the space between the inner web and the outer web of the arch rib connection section into three spaces. Second stiffeners are respectively arranged on the outer webs of the arch rib connection section in the three spaces, and the second stiffeners are parallel to the top plate of the arch rib connection section.

5. A method for splicing and assembling a large-sized asymmetric special-shaped steel arch seat according to claim 1, characterized in that, The support section includes a support section top plate, a support section outer web, a support section inner web, a support section bottom plate, a support section bulkhead, a support section transverse bulkhead and a third stiffener; The support section top plate is a support section top plate unit, the support section outer web and the support section inner web are support body inner and outer web units, the support section bottom plate is a support section bottom plate unit, and the third stiffeners are arranged vertically and horizontally on the support section transverse bulkhead; The length of the support section top plate is the same as one side width of the support section bottom plate; the upper bottom width of the support section outer web is the same as that of the support section top plate, and the lower bottom width is the same as the other side width of the support section bottom plate; a trapezoidal prism is formed by the support section top plate, the support section bottom plate and two support section outer webs; in the trapezoidal prism, two parallel support section inner webs are distributed between the two support section outer webs, and the support section inner webs are the same in shape and size as the support section outer webs; a support section transverse bulkhead is horizontally installed between the two support section inner webs, and the support section transverse bulkhead is fixedly connected to the two support section inner webs; a support section bulkhead is also vertically installed between the two support section inner webs, and the support section transverse bulkhead is respectively fixedly connected to the support section top plate and the support section transverse bulkhead.

6. A method for splicing and assembling a large-size asymmetric special-shaped steel arch seat according to claim 1, characterized in that The special-shaped steel arch seat includes an arch rib connection section, a support section unit, a bearing plate unit and a lower cross beam; the support section unit is a trapezoidal prism, and the two arch rib connection sections are respectively installed on the inclined surfaces on both sides of the support section unit through the bearing plate unit; the bottom of the support section unit is installed on the lower cross beam; the support section unit includes a support body inner and outer web unit, a support body bearing plate unit, a support body bottom plate unit and a support body top plate unit.

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