Spiral step ascending box type steel beam construction technology

Abstract

The invention belongs to the technical field of welding of steel structures, and discloses a spiral step ascending box-shaped steel beam construction process which comprises the following steps: step 1, setting machining allowance for each component plate according to a structure and a welding seam form; a jig frame is erected; 2, assembling the middle web plate, the wing plate, the corresponding secondary beam vertical stiffening plate and the corresponding column vertical stiffening plate layer by layer from low to high, and welding after assembling; 3, assembling and welding corresponding main beam vertical stiffening plates and node stiffening plates in a step node area; fourthly, transverse stiffening plates of the corresponding stand columns are installed and welded; fifthly, outer webs corresponding to the vertical stiffening plates of the main beam are assembled; step 6, assembling and welding a vertical stiffening plate of the step node; 7, assembling a port partition plate and a secondary beam web at the position of a secondary beam; eighthly, the remaining outer web is assembled and welded; and ninthly, secondary beams are installed and welded, field welding grooves are formed, and lug plates are assembled and welded. Assembly is convenient, welding deformation of components is well controlled, and the welding difficulty is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure welding, and specifically relates to a construction process for a spiral step-rising box-type steel beam. Background Art

[0002] The Shanghai Grand Opera House project is located in the enclosed area east of Expo Avenue, south of Planning Road, west of Bocheng Road, and north of Guozhan Road. It is surrounded by the Expo Cultural Park. The steel structure mainly includes the basement and the second to sixth floors of rigid steel structure, the steel structure of the Grand Opera Hall in the South Area, the steel structure of the Medium Opera Hall in the South Area, the steel structure of the Small Opera Hall in the North Area, and the steel structure of the spiral ramp in Area C; the south and north large roof steel structures, with a total weight of about 19,000 tons.

[0003] The steel structure of the spiral ramp in Zone C is mainly composed of spiral step-up box-type steel beams, radial beams and columns. The total tonnage of the spiral step-up box-type steel beams is about 1,600 tons. The main material is Q390C, the thickness of the wing plate 1 is 40 mm, and the thickness of the web plate is 20 mm. The spiral step-up box-type steel beams spirally rise in a step-like shape around the central core tube. The height of a single step is 410 mm. The nodes are divided into three layers of upper, middle and lower boxes. The cross-sectional view is similar to a six-square grid. There are many stiffening plates inside the box. The bracket 13 on the outside of the box is connected to the radial beam. The structure is complex, the welding quality and size and shape are difficult to control, and the components are easy to deform. The box beam node area is dense, there are many full penetration welds, and there are a large number of T-shaped welded joints, which are prone to welding layered tearing defects and difficult to weld.

[0004] Related reference CN115045439A discloses a method for assembling and welding a giant steel column. Although an assembly frame is also produced, its frame includes three H-shaped steels arranged in parallel, which makes it quite difficult to assemble the components of the spiral step rising box-shaped steel beam.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a construction process for spiral step-rising box-type steel beams, which is convenient for component assembly, can better control the welding deformation of components and reduce the difficulty of welding.

[0007] In order to solve the above technical problems, the present invention provides a spiral step ascending box-shaped steel beam construction process, comprising the following steps: Step 1: Set the processing allowance for each component plate according to the structure and weld form; and set up the tire frame. Before setting up the tire frame, draw the ground sample line on the platform, mark the center line and contour line, and control the length, width and diagonal deviation of the ground sample line within ±2mm. After passing the inspection, set up the step-by-step rising tire frame. The tire frame is made of H-shaped steel and fixed on the platform by welding. The set-up tire frame is used after passing the inspection; Step 2: From low to high, assemble the middle web, flange and corresponding secondary beam vertical stiffeners layer by layer, and the corresponding column vertical stiffeners. The port position and soft stop position can be spot welded for temporary support for reinforcement, and welding is performed after assembly is completed; Step 3: Assemble the vertical stiffening plates and node stiffening plates corresponding to the main beam in the welding step node area; Step 4: Assemble and weld the corresponding column transverse stiffening plates, and remove and weld them from the inside to the outside in sequence; Step 5: Assemble the outer web corresponding to the vertical stiffening plate of the main beam; Step 6: Assemble and weld the vertical stiffening plates at the step nodes; Step 7, assemble the port partition and the secondary beam web at the secondary beam position; Step 8: Assemble the remaining outer webs and weld them; Step nine, assemble and weld the secondary beam, open the on-site welding groove and install the welding ear plate. The secondary beam position is positioned using coordinate positioning during assembly.

[0008] Preferably, in step 2, there is a full penetration weld between the middle web and the wing plate, and the groove is a K-type root clearing form; there is a partial penetration weld between the corresponding secondary beam vertical stiffening plate and the wing plate, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm; there is a full penetration weld between the corresponding column vertical stiffening plate and the wing plate, and the groove is a pad weld form.

[0009] Preferably, in step three, there is a full penetration weld between the node stiffening plate and the wing plate, and the groove is a K-shaped root clearing form; there is a partial penetration weld between the node stiffening plate and the middle web plate, and the groove is a K-shaped groove with a blunt edge of 2 mm; there is a full penetration weld between the corresponding main beam vertical stiffening plate and the middle web plate, and there is a partial penetration weld between the corresponding main beam vertical stiffening plate and the wing plate, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

[0010] Preferably, in step four, there is a full penetration weld between the corresponding column transverse stiffening plate and the wing plate, and the groove form is a pad weld with a blunt edge of 2mm; there is a partial penetration weld between the corresponding column transverse stiffening plate and other secondary beam vertical stiffening plates, the corresponding column vertical stiffening plates, the corresponding main beam vertical stiffening plates, and the node stiffening plates, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

[0011] Preferably, in step five, the weld between the outer web and the corresponding main beam vertical stiffening plate is required to be a full penetration weld, and the groove is welded with a pad.

[0012] Preferably, in step six, there is a full penetration weld between the vertical stiffening plate at the step node and the wing plate, and the groove is a pad weld form; there is a partial penetration weld between the vertical stiffening plate at the step node and the middle web and outer web, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

[0013] Preferably, in step seven, the weld between the secondary beam web and the corresponding secondary beam vertical stiffening plate is a partial penetration weld, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

[0014] Preferably, in step eight, the remaining outer web and the wing plate are full penetration welds in the node area, and the groove is a pad weld form. The welds between the wing plate in the non-node area and the remaining outer web, as well as the welds between the remaining outer web and the corresponding secondary beam vertical stiffening plate, the corresponding column vertical stiffening plate, the node stiffening plate, the corresponding column transverse stiffening plate, and the step node vertical stiffening plate are partial penetration welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The geometric development of the spiral ramp steel structure roof in area C of this application naturally forms a spiral staircase with a novel structure. The design of the tire frame rises step by step. The intermediate webs, wing plates and the corresponding secondary beam vertical stiffening plates and the corresponding column vertical stiffening plates are assembled layer by layer from low to high on the tire frame. The assembly is convenient and efficient. After the assembly, the stiffening plates and outer webs are welded step by step, which meets the requirements of the designed structural welds, better controls the deformation of the components, and enhances the strength of the steel structure roof. At the same time, the reasonable welding sequence reduces the welding difficulty and workload, and the factory construction is also convenient.

[0016] 2. The present application adopts H-shaped steel to make a step-by-step ascending assembly frame, so that the manufactured frame matches the components in both plane and height directions, which is convenient for factory assembly and inspection and can effectively control the assembly size.

[0017] 3. The box girder of this application rises in a spiral step around the central column of zone C as a whole. The node area of ​​the box girder is dense, and there are many full penetration welds. Considering the plate thickness and space conditions, two types of grooves, K-type or V-type, with a blunt edge of 2mm, are adopted to better control the quality of the welds and ensure high precision of the production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the spiral step ascending box-shaped steel beam structure of the present invention; Figure 2-4 This is a schematic diagram of step 1 of the present invention; Figure 5 This is a schematic diagram of step 2 of the present invention; Figure 6 This is a schematic diagram of step three of the present invention; Figure 7 This is a schematic diagram of step 4 of the present invention; Figure 8 This is a schematic diagram of step five of the present invention; Fig. 9 This is a schematic diagram of step six of the present invention; Fig.10 This is a schematic diagram of step seven of the present invention; Fig.11 This is a schematic diagram of step eight of the present invention; Fig.12 This is a schematic diagram of step nine of the present invention; Fig.13 This is a schematic diagram of step ten of the present invention.

[0019] Figure number: 1. Wing plate, 2. Middle web plate, 3. Corresponding secondary beam vertical stiffening plate, 4. Corresponding column vertical stiffening plate, 5. Corresponding main beam vertical stiffening plate, 6. Node stiffening plate, 7. Corresponding column transverse stiffening plate, 8. Outer web plate, 9. Step node vertical stiffening plate, 10. Port partition plate, 11. Secondary beam web plate, 12. Ear plate, 13. Corbel. DETAILED DESCRIPTION

[0020] The processing scheme of the spiral step rising box steel beam is as follows: like Figure 1 As shown, the spiral step rising box steel beam is mainly composed of wing plate 1, middle web plate 2, stiffening plate, and bracket 13 connecting the main and secondary beams. According to the structure and weld form, the processing allowance is set for each component plate. The wing plate 1 and the middle web plate 2 at the two end positions are cut with a 15mm allowance for each length, and are cut off after the assembly welding is completed; the middle section wing plate 1, the length direction is added with a 0.5mm welding shrinkage allowance per meter. The width net size is cut; the inner middle web plate 2, the length direction is added with a 0.5mm welding shrinkage allowance per meter, the height direction is added with a 3mm welding shrinkage allowance per piece, and the length direction is rounded up; the outer web plate 8 on the outside, the length direction is added with a 0.5mm welding shrinkage allowance per meter, and the length is less than 2m, and the height direction, no allowance is added; other partitions / rib plates are not added. When the groove is opened, for the T-joint and the corner joint, an anti-tear groove is opened, and the width size is T / 2+2mm, which can avoid the parent material from bearing large welding shrinkage stress in the thickness direction and prevent laminar tearing. The root cleaning and full penetration welding sets the groove direction to the direction that is convenient for operation, and the root cleaning side is placed on the side with large space. Large root cleaning space can facilitate operation and inspection, which is conducive to ensuring full penetration welds. For structural welds in confined spaces, full penetration welds are welded on one side with pads. Pad welding can be used for single-sided welding, which is convenient for factory construction and can meet the design weld requirements. The outer corbel 13 of the box girder should be welded in small units first and then assembled in large units after passing the inspection.

[0021] The geometric development of the steel structure roof of the spiral ramp in area C naturally forms a spiral staircase with a novel structure. The design of the step-by-step rising tire frame, from low to high, assemble the middle web 2, wing plate 1 and the corresponding secondary beam vertical stiffening plate 3, and the corresponding column vertical stiffening plate 4 layer by layer. The assembly is convenient and fast. After the assembly, the stiffening plate and the outer web 8 are welded step by step, which meets the requirements of the designed structural welds, better controls the deformation of the components, and enhances the strength of the steel structure roof. At the same time, the reasonable welding sequence reduces the welding workload, and the factory construction is also convenient. The specific operation steps of the construction process of the spiral step-rising box-type steel beam are as follows: Step 1: Figure 2 As shown, the tire frame is set up: before the tire frame is set up, the ground sample line is drawn on the platform, and the center line and contour line are marked. The length, width and diagonal deviation of the ground sample line are controlled within ±2mm. After passing the inspection, the tire frame that rises step by step is set up. The tire frame is made of H-shaped steel and fixed on a solid platform by welding. The H-shaped steel is used to make the assembly tire frame that rises step by step, so that the manufactured tire frame matches the components in both plane and height directions, which is convenient for factory assembly and inspection, and can effectively control the assembly size. The set-up tire frame can be used only after passing the inspection.

[0022] Step 2: Figure 3-5 As shown, from low to high, the middle web 2, wing plate 1 and the corresponding secondary beam vertical stiffening plate 3, and the corresponding column vertical stiffening plate 4 are assembled layer by layer. The port position and the soft position can be spot welded for temporary support for reinforcement. After assembly, welding is performed. There is a full penetration weld between the middle web 2 and the wing plate 1, and the groove is a K-type root clearing form. There is a partial penetration weld between the corresponding secondary beam vertical stiffening plate 3 and the wing plate 1, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm. There is a full penetration weld between the corresponding column vertical stiffening plate 4 and the wing plate 1, and the groove is a pad weld.

[0023] Step 3: Figure 6 As shown, the vertical stiffening plates 5 and 6 of the corresponding main beams in the assembled welding step node area are provided. The node stiffening plate 6 and the wing plate 1 are fully penetrated welds, and the groove is a K-shaped root-clearing form. The node stiffening plate 6 and the middle web plate 2 are partially penetrated welds, and the groove is a K-shaped groove with a blunt edge of 2mm. The vertical stiffening plates 5 and the middle web plate 2 are fully penetrated welds, and the vertical stiffening plates 5 and the wing plate 1 are partially penetrated welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

[0024] Step 4: Figure 7As shown, the corresponding column transverse stiffening plate 7 is welded, and the welding is performed from the inside to the outside in sequence. The corresponding column transverse stiffening plate 7 and the wing plate 1 are fully penetrated welds, and the groove form is a pad welding form with a blunt edge of 2mm. The corresponding column transverse stiffening plate 7 and other corresponding secondary beam vertical stiffening plates 3, corresponding column vertical stiffening plates 4, corresponding main beam vertical stiffening plates 5, and node stiffening plates 6 are partially penetrated welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

[0025] Step 5: Figure 8 As shown, the outer web 8 at the corresponding main beam vertical stiffening plate 5 is assembled, and the weld between the outer web 8 and the corresponding main beam vertical stiffening plate 5 is welded. The weld is required to be a full penetration weld, and the groove adopts the pad welding form.

[0026] Step 6: Fig. 9 As shown, the vertical stiffening plate 9 of the step node is assembled and welded, the vertical stiffening plate 9 of the step node and the wing plate 1 are fully penetrated welds, and the groove is in the form of pad welds, and the vertical stiffening plate 9 of the step node and the middle web 2 and the outer web 8 are partially penetrated welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

[0027] Step 7: Fig.10 As shown, continue to remove and weld the step node vertical stiffening plate 9, the step node vertical stiffening plate 9 and the wing plate 1 are full penetration welds, the groove is a pad weld type, the welds between the step node vertical stiffening plate 9 and the middle web 2 and the outer web 8 are partial penetration welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

[0028] Step 8: Fig.11 As shown, the port partition 10 and the secondary beam web 11 at the secondary beam position are assembled, and the weld between the secondary beam web 11 and the corresponding secondary beam vertical stiffening plate 3 is welded. The weld is a partial penetration weld, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

[0029] Step 9: Fig.12 As shown, the remaining outer web 8 is assembled and welded, the remaining outer web 8 and the wing plate 1 are full penetration welds in the node area, and the groove is a pad weld form. The welds between the wing plate 1 and the remaining outer web 8 in the non-node area, as well as the welds between the remaining outer web 8 and the corresponding secondary beam vertical stiffening plate 3, the corresponding column vertical stiffening plate 4, the node stiffening plate 6, the corresponding column transverse stiffening plate 7, and the step node vertical stiffening plate 9 are partial penetration welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

[0030] Step 10: Fig.13As shown, the secondary beam is welded, the on-site welding groove is opened and the welding ear plate 12 is assembled. The secondary beam position is positioned by coordinate positioning during assembly. Positioning can be performed by ground sample or total station marking, and the diagonal line is checked for positioning accuracy. The weld between the wing plate 1 and the radial beam is a full penetration weld, and the groove is a K-shaped root cleaning weld. The weld between the middle web 2 and the radial beam is determined according to the thickness of the middle web 2. When the plate thickness is less than 16mm, the weld leg size is 0.7 times the thickness of the middle web 2. When the plate thickness is greater than or equal to 16mm, it is a partial penetration weld, and the groove is a K-shaped groove with a blunt edge of 2mm.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spiral step-up box-shaped steel beam construction process, characterized in that: The steps include: Step 1: Set the processing allowance for each component plate according to the structure and weld form; and set up the tire frame. Before setting up the tire frame, draw the ground sample line on the platform, mark the center line and contour line, and control the length, width and diagonal deviation of the ground sample line within ±2mm. After passing the inspection, set up the step-by-step rising tire frame. The tire frame is made of H-shaped steel and fixed on the platform by welding. The set-up tire frame is used after passing the inspection; Step 2: From low to high, assemble the middle web, flange and corresponding secondary beam vertical stiffeners layer by layer, and the corresponding column vertical stiffeners. The port position and soft stop position can be spot welded for temporary support for reinforcement, and welding is performed after assembly is completed; Step 3: Assemble the vertical stiffening plates and node stiffening plates corresponding to the main beam in the welding step node area; Step 4: Assemble and weld the corresponding column transverse stiffening plates, and remove and weld them from the inside to the outside in sequence; Step 5: Assemble the outer web corresponding to the vertical stiffening plate of the main beam; Step 6: Assemble and weld the vertical stiffening plates at the step nodes; Step 7, assemble the port partition and the secondary beam web at the secondary beam position; Step 8: Assemble the remaining outer webs and weld them; Step nine, assemble and weld the secondary beam, open the on-site welding groove and install the welding ear plate. The secondary beam position is positioned using coordinate positioning during assembly.

2. A spiral step ascending box-shaped steel beam construction process according to claim 1, characterized in that: In the step 2, there is a full penetration weld between the middle web and the wing plate, and the groove is a K-type root clearing form. There is a partial penetration weld between the corresponding secondary beam vertical stiffening plate and the wing plate, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm. There is a full penetration weld between the corresponding column vertical stiffening plate and the wing plate, and the groove is a pad weld.

3. A spiral step ascending box-shaped steel beam construction process according to claim 1, characterized in that: In the step three, there is a full penetration weld between the node stiffening plate and the wing plate, and the groove is a K-shaped root clearing form. There is a partial penetration weld between the node stiffening plate and the middle web plate, and the groove is a K-shaped groove with a blunt edge of 2mm. There is a full penetration weld between the corresponding main beam vertical stiffening plate and the middle web plate, and there is a partial penetration weld between the corresponding main beam vertical stiffening plate and the wing plate, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

4. A spiral step ascending box-shaped steel beam construction process according to claim 1, characterized in that: In the step four, the corresponding column transverse stiffening plate and the wing plate are fully penetrated welds, the groove form is a pad weld with a blunt edge of 2mm, the corresponding column transverse stiffening plate and other secondary beam vertical stiffening plates, the corresponding column vertical stiffening plates, the corresponding main beam vertical stiffening plates, and the node stiffening plates are partially penetrated welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2mm.

5. The spiral step ascending box-shaped steel beam construction process according to claim 1 is characterized in that: In the step 5, the weld between the outer web and the corresponding main beam vertical stiffening plate is required to be a full penetration weld, and the groove is welded with a pad.

6. A spiral step ascending box-shaped steel beam construction process according to claim 1, characterized in that: In step six, a full penetration weld is formed between the vertical stiffening plate at the step node and the wing plate, and the groove is in the form of a pad weld. A partial penetration weld is formed between the vertical stiffening plate at the step node and the middle web and outer web, and the groove is in the form of a single-sided V-shaped groove with a blunt edge of 2 mm.

7. The spiral step ascending box-shaped steel beam construction process according to claim 1 is characterized in that: In the step seven, the weld between the secondary beam web and the corresponding secondary beam vertical stiffening plate is a partial penetration weld, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

8. The construction process of a spiral step-up box-shaped steel beam according to claim 1 is characterized in that: In the step eight, the remaining outer web and the wing plate are full penetration welds in the node area, and the groove is a pad weld form. The welds between the wing plate in the non-node area and the remaining outer web, as well as the welds between the remaining outer web and the corresponding secondary beam vertical stiffening plate, the corresponding column vertical stiffening plate, the node stiffening plate, the corresponding column transverse stiffening plate, and the step node vertical stiffening plate are partial penetration welds, and the groove is a single-sided V-shaped groove with a blunt edge of 2 mm.

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