CN114535850B - Control method for planeness of large-scale steel bridge support backing plate - Google Patents
Control method for planeness of large-scale steel bridge support backing plate Download PDFInfo
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- CN114535850B CN114535850B CN202210175748.XA CN202210175748A CN114535850B CN 114535850 B CN114535850 B CN 114535850B CN 202210175748 A CN202210175748 A CN 202210175748A CN 114535850 B CN114535850 B CN 114535850B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The flatness control method for the large-scale steel bridge support backing plate comprises the following steps: temporarily welding constraint beams, processing support base plates, assembling a first diaphragm plate, assembling middle stiffening plates, assembling a second diaphragm plate, assembling outer stiffening plates, assembling connecting webs, releasing constraint beams, assembling support base plates, processing support connecting holes, finally welding support base plates and a steel bridge base plate. The invention adopts the mounting sequence, the welding method and the temporary constraint method at the support stiffening position to ensure the planeness of the large-size support backing plate and improve the manufacturing quality of the components at the support position of the steel bridge; the problems of poor installation quality and large assembly gap of the traditional steel bridge support base plate are solved, and the installation quality and flatness of the large-size support base plate are ensured; the practicability is strong, the operation is simple, and the method is suitable for popularization.
Description
Technical Field
The invention belongs to the technical field of fixed building bridge part support base plates, and particularly relates to a flatness control method for a large-scale steel bridge support base plate.
Background
For large-scale steel bridge structures, the support base plate is a very important force transmission and leveling component, and the flatness control of the support base plate is particularly important in the steel bridge manufacturing process.
Because the steel bridge has small self weight or different stress systems, most of steel bridge support base plate areas are less than or equal to 3m 2 . With the appearance of steel bridges with large-span continuous beams or ultra-large-span sling systems, large-size supports are required to be used as a bearing structure, so that the sizes of the steel bridge support plates are larger and larger, and the area is larger than or equal to 8m 2 Is provided.
Because the area of the steel bridge support base plate is smaller in the past, the welding deformation of the steel bridge bottom plate stiffening plate has very little influence on the support base plate, and the flatness of the steel bridge support base plate can meet the manufacturing requirement almost without control, so that the technology in the aspect of controlling the flatness of the support base plate is also not available. But for areas that have appeared ≡8m 2 For the large-scale steel bridge support backing plate, the problem of welding deformation is remarkable, so that the flatness control technology of the steel bridge support backing plate needs to be developed. In this regard, the following technical solutions are now proposed.
Disclosure of Invention
The invention solves the technical problems that: the flatness control method for the large-size steel bridge support base plate solves the technical problem that flatness is not easy to control when the large-size steel bridge support base plate is manufactured by means of welding deformation control, specific installation sequence, temporary constraint and the like.
The invention adopts the technical scheme that: the control method for the planeness of the large-scale steel bridge support cushion plate comprises the following steps:
s1, temporarily welding a constraint beam: and arranging a plurality of constraint beams at the bottom of the steel bridge bottom plate at the assembly position of the steel bridge support base plate, enabling the constraint beams to be perpendicular to the extending direction of the diaphragm plates, and temporarily welding and connecting the constraint beam web plate with the steel bridge bottom plate through the constraint beam horse plates of the constraint beams.
S2, processing a support base plate: a plurality of uniformly distributed bolt connecting holes are processed on the periphery of the support base plate, and a plurality of uniformly distributed welding connecting holes are processed in the middle of the support base plate.
S3, assembling a first diaphragm plate: and assembling a first diaphragm plate on the steel bridge bottom plate according to a pre-drawn assembly position line, and arranging a diaphragm plate on the inner edges of the welding seams of the steel bridge bottom plate and the first diaphragm plate before welding the first diaphragm plate so as to prevent the welding deformation of the first diaphragm plate and the steel bridge bottom plate.
S4, assembling the middle stiffening plate: and step S3, after the welding seams of the steel bridge bottom plate and the first diaphragm plate are detected to be qualified, assembling and welding a plurality of middle stiffening plates.
S5, assembling a second diaphragm plate: and assembling a second diaphragm, wherein a single-sided groove facing to the outer side is arranged in the installation range of the middle stiffening plate and the outer stiffening plate of the second diaphragm, and a diaphragm horse plate is arranged along the welding seam of the steel bridge bottom plate and the second diaphragm in advance before the second diaphragm is welded with the steel bridge bottom plate so as to prevent the second diaphragm from being welded and deformed with the steel bridge bottom plate.
S6, assembling the outer stiffening plate: a plurality of outer stiffening plates are assembled between the steel bridge bottom plate and the transverse partition plate; welding the penetration welding angle weld between the outer stiffening plate and the diaphragm plate, and then welding the angle weld between the outer stiffening plate and the steel bridge bottom plate.
S7, assembling a connecting web plate: and S6, welding a welding seam for connecting the web plate and the outer stiffening plate after the assembly clearance between the outer stiffening plate and the steel bridge bottom plate is checked to be qualified.
S8, releasing the constraint beam: and releasing the constraint beam, and detecting the planeness of the mounting position of the support base plate to ensure that the planeness is qualified.
S9, assembling a support base plate: drawing an assembly position line at the bottom of the steel bridge bottom plate, and assembling a support base plate according to the assembly position line; when the support base plate is assembled, the welding connection holes of the support base plate are sequentially welded from the middle to the outside, and the welding seams of the welding connection holes cannot exceed the plane of the support base plate.
S10, machining a support connecting hole: and processing the support connecting hole coaxially opposite to the bolt connecting hole by taking the bolt connecting hole on the support base plate as a reference.
S11, final welding a support base plate and a steel bridge bottom plate: and (3) installing the steel bridge manufactured in the step (S10) in place, then welding a fillet weld between the support base plate and the steel bridge bottom plate, and welding the support base plate and the steel bridge bottom plate into a whole.
In the above technical solution, further: in the step S1 and the step S8, the section of the constraint beam is of a hollow box-shaped structure; the left and right outer shafts of the constraint beam box-shaped body in the length direction are symmetrically and uniformly distributed with a plurality of constraint beam horse plates; the inner side of the top end of the restraining cross beam horse plate is provided with a horse plate notch with a concave arc-shaped structure.
In the above technical solution, preferably: in the step S2, the bolt connecting hole is a round hole; the welding connection hole is a square hole, and the bolt connection hole and the welding connection hole are manufactured through numerical control cutting processing.
In the above technical solution, preferably: in the step S3 and the step S5, the diaphragm plate is welded with the steel bridge bottom plate by adopting double-sided slope corner welding seams.
In the above technical solution, preferably: in the step S4, welding the groove penetration fillet weld of the middle stiffening plate and the first diaphragm plate; welding the close-fitting fillet weld between the middle stiffening plate and the steel bridge bottom plate; wherein, the close-fitting fillet weld assembly gap between the middle stiffening plate and the steel bridge bottom plate is less than or equal to 0.2mm.
In the above technical solution, preferably: in step S6: firstly welding groove penetration fillet welds of the outer stiffening plate and the diaphragm plate; welding the close-fitting fillet weld of the outer stiffening plate and the steel bridge bottom plate; wherein, the close-fitting fillet weld assembly clearance between the outer stiffening plate and the steel bridge bottom plate is less than or equal to 0.2mm.
In the above technical solution, preferably: the stiffening plates are arranged at a distance of 0.2-0.3 m from the edges of the support base plate, and the stiffening plates are symmetrically arranged.
In the above technical solution, preferably: in step S8, detecting flatness by adopting a steel plate ruler; and the flatness is less than or equal to 2mm.
In the above technical solution, preferably: in step S10, the holder connection hole is formed by flame cutting.
In the technical scheme, the area of the backing plate of the large-sized steel bridge support is more than or equal to 8m 2 。
Compared with the prior art, the invention has the advantages that:
1. the invention adopts two diaphragm plates, and the stress at the support seat position is transmitted to the whole steel bridge through the two diaphragm plates, so that the stress is dispersed, and the support strength of the whole steel bridge structure is improved.
2. The stiffening plates are symmetrically arranged, so that the influence on the flatness of the steel bridge bottom plate after the middle stiffening plate and the outer stiffening plates are welded with the steel bridge bottom plate is reduced; the stiffening plate is arranged at a position 0.2 m-0.3 m away from the edge of the support base plate, so that the bearing requirement of the support base plate is met.
3. The thickness of the diaphragm plate is generally not less than 24mm, the diaphragm plate is welded by adopting double-sided symmetrical grooves in order to avoid welding angle deformation in the welding process, and the diaphragm plate horse plate is arranged before welding so as to control the welding deformation of the diaphragm plate again.
4. After the support base plate is assembled in place, the welding connecting holes are sequentially welded from the middle to the outside, so that the problem of middle bulge after the peripheral ring of the large-size support base plate is welded is prevented.
5. According to the invention, the flatness of the large-size support base plate is ensured by the methods of mounting sequence, welding method, temporary constraint and the like at the support stiffening position, so that the manufacturing quality of the member at the support position of the steel bridge is improved; the problem that the traditional steel bridge support base plate is poor in installation quality and large in assembly gap is solved, and the installation quality and flatness of the large-size support base plate can be guaranteed; the practicability is strong, the operation is simple, and the method is suitable for popularization.
Drawings
FIG. 1 shows that the area of the invention is 8m 2 A schematic diagram of a large-scale steel bridge support cushion plate structure;
FIG. 2 is a structural state diagram of step S1 in the method of the present invention;
FIG. 3 is a block diagram of a support pallet in step S2 of the method of the present invention;
FIG. 4 is a structural state diagram of step S3 in the method of the present invention;
FIG. 5 is a structural state diagram of step S4 in the method of the present invention;
FIG. 6 is a structural state diagram of step S5 in the method of the present invention;
FIG. 7 is a structural state diagram of step S6 in the method of the present invention;
FIG. 8 is a structural diagram of step S7 in the method of the present invention;
FIG. 9 is a structural diagram of step S8 in the method of the present invention;
FIG. 10 is a structural diagram of step S9 in the method of the present invention;
FIG. 11 is a structural diagram of step S10 in the method of the present invention;
FIG. 12 is a structural state diagram of step S11 in the method of the present invention;
FIG. 13 is a schematic view of the structure of the restraining beams used in step S1 of the method of the present invention;
in the figure: the bridge comprises a 1-steel bridge bottom plate, a 101-diaphragm plate horse plate, a 2-diaphragm plate, a 3-middle stiffening plate, a 4-outer stiffening plate, a 5-connecting web plate, a 6-support connecting hole, a 7-support backing plate, a 701-bolt connecting hole and a 702-welding connecting hole; 8-constraint beam, 801-constraint beam horse board, 802-horse board notch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 13 in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The control method for the planeness of the large-scale steel bridge support cushion plate comprises the following steps:
wherein (shown in figure 1), the area of the backing plate of the large-scale steel bridge support is more than or equal to 8m 2 . In order to avoid the problem of welding deformation, the method comprises the following operation steps:
step S1 (as shown in fig. 2 and 13), temporarily welding the restraint beam: the bottom of the steel bridge bottom plate 1 at the assembly position of the steel bridge support base plate 7 is provided with a plurality of constraint beams 8, the constraint beams 8 are perpendicular to the extending direction of the diaphragm plates 2, and the constraint beams 8 are connected with the steel bridge bottom plate 1 by temporary welding through constraint beam horse plates 801 of the constraint beams 8. It can be seen that the flatness of the steel bridge bottom plate 1 is ensured by arranging the constraint beam.
In the above embodiment, further: the cross section of the constraint beam 8 is of a hollow box-shaped structure; reducing dead weight. Furthermore, a plurality of constraint beam horse plates 801 are symmetrically and uniformly distributed on the left and right outer shafts of the constraint beam 8 in the box-shaped length direction; the flatness of the temporary welding of the restraint beams is ensured by the restraint beam horse 801. The inner side of the top end of the constraint beam horse plate 801 is provided with a horse plate notch 802 with a concave arc-shaped structure, and the horse plate notch 802 is arranged, so that the constraint beam 8 can be conveniently detached in the later period.
In the above embodiment, it is preferable that: the spacing between the multi-channel constraint beams 8 is 600 mm-850 mm; the spacing between adjacent constraint beam horse plates 801 is 400 mm-600 mm. Meet the requirement that the area of the backing plate of the large-scale steel bridge support is more than or equal to 8m 2 Is required to maintain the flatness of the sheet.
(as shown in fig. 3), step S2, processing the support pad: a plurality of uniformly distributed bolt connecting holes 701 are processed on the periphery of the support base plate 7, and are uniformly distributed, so that stress distribution is uniform; and a plurality of evenly distributed welding connection holes 702 are processed in the middle of the support base plate 7, the welding connection holes are used for welding and fixedly connecting the support base plate 7 and the steel bridge base plate 1, and the bolt connection holes 701 are used for fixedly installing the whole large-scale steel bridge support base plate.
In the above embodiment, in step S2, the bolt connection hole 701 is a circular hole; the welding connection hole 702 is a square hole, and the bolt connection hole 701 and the welding connection hole 702 are manufactured through numerical control cutting, so that the hole precision is fully ensured, and meanwhile, the structural stability is ensured.
In the above embodiment, it is preferable that: the number of the welding connection holes 702 is 6-12; and the width of the welding connection hole 702 is more than or equal to 20mm, the length is more than or equal to 100mm, and the sufficient welding connection strength is ensured.
(as shown in fig. 4), step S3, assembling the first diaphragm: the first diaphragm plate 2 is assembled on the steel bridge floor 1 according to a pre-drawn assembly position line. Before the first diaphragm plate 2 is welded, a diaphragm plate horse plate 101 is arranged at the inner edge of the welding seam of the steel bridge bottom plate 1 and the first diaphragm plate 2 so as to prevent the welding deformation of the first diaphragm plate 2 and the steel bridge bottom plate 1.
In the embodiment, in the step S3, the thickness of the plate body of the diaphragm plate 2 is more than or equal to 24mm; the interval between the diaphragm horse plates 101 is 400 mm-500 mm; the diaphragm plate 2 is welded and connected with the steel bridge bottom plate 1 by adopting double-sided slope corner welds, so that the welding deformation of the diaphragm plate and the steel bridge bottom plate 1 is avoided.
(as shown in fig. 5), step S4, assembling the intermediate stiffener: and step S3, assembling and welding a plurality of middle stiffening plates 3 after the welding lines of the steel bridge bottom plate 1 and the first diaphragm plate 2 are detected to be qualified, namely, deformation is avoided.
In the above embodiment, further: in the step S4, welding the groove penetration fillet weld of the middle stiffening plate 3 and the first diaphragm plate 2; then welding the close-fitting fillet weld between the middle stiffening plate 3 and the steel bridge bottom plate 1; wherein, the close-fitting fillet weld assembling clearance between the middle stiffening plate 3 and the steel bridge bottom plate 1 is less than or equal to 0.2mm.
Wherein, five middle stiffening plates 3 perpendicular to the diaphragm plate 2 are arranged, and the distance between the five middle stiffening plates 3 is 0.3 m-0.5 m.
Preferably: the middle stiffening plate 3 and the diaphragm plate 2 are welded by adopting a bevel angle welding seam, and the middle stiffening plate 3 and the steel bridge bottom plate 1 are connected by adopting a tight-fitting and fillet welding seam, so that the stress performance of the integral structure at the support position is effectively improved.
(as shown in fig. 6), step S5, assembling the second diaphragm: and assembling the second diaphragm plate 2, and arranging a single-sided groove facing to the outer side in the installation range of the middle stiffening plate 3 and the outer stiffening plate 4 of the second diaphragm plate 2. Before the second diaphragm plate 2 is welded with the steel bridge bottom plate 1, a diaphragm plate horse plate 101 is arranged along the welding seam of the steel bridge bottom plate 1 and the second diaphragm plate 2 in advance so as to prevent the second diaphragm plate 2 from welding deformation with the steel bridge bottom plate 1.
In the above embodiment, further: in the step S5, the thickness of the plate body of the diaphragm plate 2 is more than or equal to 24mm; the interval between the diaphragm horse plates 101 is 400 mm-500 mm; the diaphragm plate 2 is welded with the steel bridge bottom plate 1 by adopting double-sided slope corner welding seams. The distance between the two diaphragm plates 2 is 1 m-1.5 m.
Therefore, the invention adopts two diaphragm plates 2, and the stress at the support seat position of the invention is transmitted to the whole steel bridge body through the two diaphragm plates 2, so that the stress is dispersed, and the supporting strength of the whole steel bridge body structure is increased.
Moreover, as the thickness of the diaphragm plate 2 is generally not less than 24mm, in order to avoid welding angle deformation in the welding process, the diaphragm plate 2 is welded by adopting double-sided symmetrical grooves, and the diaphragm plate horse plate 101 is arranged before welding so as to control the welding deformation of the diaphragm plate again.
(as shown in FIG. 7) step S6, assembling the outboard stiffener: a plurality of outer stiffening plates 4 are assembled between the steel bridge bottom plate 1 and the diaphragm plates 2. The welding sequence during welding is as follows: the penetration welding fillet between the outer stiffening plate 4 and the diaphragm plate 2 is firstly welded, and then the fillet between the outer stiffening plate 4 and the steel bridge bottom plate 1 is welded, so that the welding deformation problem is avoided.
In the above embodiment, further: in step S6: firstly welding groove penetration fillet welds of the outer stiffening plate 4 and the diaphragm plate 2; then welding the close-fitting fillet weld of the outer stiffening plate 4 and the steel bridge bottom plate 1; wherein, the close-contact fillet weld assembling clearance between the outer stiffening plate 4 and the steel bridge bottom plate 1 is less than or equal to 0.2mm.
In the above embodiment, further: the outer stiffening plates 4 are arranged at a distance of 0.2-0.3 m from the edge of the support base plate 7, and the outer stiffening plates 4 and the middle stiffening plates 3 are symmetrically arranged.
The outer stiffening plates 4 and the middle stiffening plates 3 are symmetrically arranged, so that the influence on the flatness of the steel bridge bottom plate 1 after the middle stiffening plates 3 and the outer stiffening plates 4 are welded with the steel bridge bottom plate 1 is reduced; the outer stiffening plate 4 is arranged at a position 0.2 m-0.3 m away from the edge of the support base plate 7, so that the bearing requirement of the support base plate 7 is met.
(as shown in fig. 8), step S7, assembling the connecting web: and step S6, welding the welding seams of the connecting web 5 and the outer stiffening plate 4 after the assembly gap between the outer stiffening plate 4 and the steel bridge bottom plate 1 is checked to be qualified.
(as shown in fig. 9), step S8, releasing the restraint beam: and releasing the constraint beam 8, and detecting the flatness of the mounting position of the support base plate 7 to ensure that the flatness is qualified.
In the above embodiment, further: in step S8, detecting flatness by adopting a steel plate ruler; and the flatness is less than or equal to 2mm.
(as shown in fig. 10), step S9, assembling the support pad: drawing an assembly position line at the bottom of the steel bridge bottom plate 1, and assembling a support base plate 7 according to the assembly position line; when the support base plate 7 is assembled, the welding connection holes 702 of the support base plate 7 are sequentially welded from the middle to the outside, and the welding seams of the welding connection holes 702 cannot exceed the plane of the support base plate 7.
It can be seen that after the support base plate 7 is assembled in place, the welding connection holes 702 are sequentially welded from the middle to the outside, so that the problem of middle bulge generated after the welding of the circumference of the large-size support base plate 7 is prevented.
(as shown in fig. 11), step S10, machining the holder connection hole: the support connection hole 6 coaxially opposed to the bolt connection hole 701 is processed with reference to the bolt connection hole 701 on the support base plate 7.
In the above embodiment, further: in step S10, the holder connection hole 6 is formed by flame cutting.
(as shown in fig. 12) step S11, final welding the support pad and the steel bridge floor: and (3) installing the steel bridge manufactured in the step (S10) in place, then welding the fillet weld between the support base plate 7 and the steel bridge bottom plate 1, and welding the support base plate 7 and the steel bridge bottom plate 1 into a whole.
In summary, the method ensures the planeness of the large-size support base plate by the methods of mounting sequence, welding method, temporary constraint and the like at the support stiffening position, thereby improving the manufacturing quality of the member at the support position of the steel bridge; the problem that the traditional steel bridge support base plate is poor in installation quality and large in assembly gap is solved, and the installation quality and flatness of the large-size support base plate can be guaranteed; the practicability is strong, the operation is simple, and the method is suitable for popularization.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (10)
1. The method for controlling the flatness of the large-scale steel bridge support backing plate is characterized by comprising the following steps of:
s1, temporarily welding a constraint beam: arranging a plurality of constraint beams (8) at the bottom of a steel bridge bottom plate (1) at the assembly position of a steel bridge support base plate (7), enabling the constraint beams (8) to be perpendicular to the extending direction of a diaphragm plate (2), and temporarily welding and connecting a constraint beam web plate with the steel bridge bottom plate (1) through constraint beam horse plates (801) arranged on the constraint beams (8);
s2, processing a support base plate: a plurality of uniformly distributed bolt connecting holes (701) are processed on the periphery of the support base plate (7), and a plurality of uniformly distributed welding connecting holes (702) are processed in the middle of the support base plate (7);
s3, assembling a first diaphragm plate: a first diaphragm plate (2) is assembled on a steel bridge bottom plate (1) according to a pre-drawn assembly position line, and a diaphragm plate horse plate (101) is arranged at the inner edge of a welding seam of the steel bridge bottom plate (1) and the first diaphragm plate (2) before the first diaphragm plate (2) is welded so as to prevent welding deformation of the first diaphragm plate (2) and the steel bridge bottom plate (1);
s4, assembling the middle stiffening plate: step S3, after welding seams of the steel bridge bottom plate (1) and the first diaphragm plate (2) are detected to be qualified, assembling and welding a plurality of middle stiffening plates (3);
s5, assembling a second diaphragm plate: assembling a second diaphragm plate (2), arranging a single-sided groove facing to the outer side in the installation range of a middle stiffening plate (3) and an outer stiffening plate (4) of the second diaphragm plate (2), and arranging a diaphragm plate (101) along the welding seam of the steel bridge bottom plate (1) and the second diaphragm plate (2) in advance before welding the second diaphragm plate (2) and the steel bridge bottom plate (1) so as to prevent the welding deformation of the second diaphragm plate (2) and the steel bridge bottom plate (1);
s6, assembling the outer stiffening plate: a plurality of outer stiffening plates (4) are assembled between the steel bridge bottom plate (1) and the diaphragm plates (2); welding a penetration welding angle weld between the outer stiffening plate (4) and the diaphragm plate (2), and then welding an angle weld between the outer stiffening plate (4) and the steel bridge bottom plate (1);
s7, assembling a connecting web plate: s6, welding a welding seam connecting the web plate (5) and the outer stiffening plate (4) after the assembly clearance between the outer stiffening plate (4) and the steel bridge bottom plate (1) is checked to be qualified;
s8, releasing the constraint beam: releasing the constraint beam (8), and detecting the flatness of the mounting position of the support base plate (7) to ensure that the flatness is qualified;
s9, assembling a support base plate: drawing an assembly position line at the bottom of the steel bridge bottom plate (1), and assembling a support base plate (7) according to the assembly position line; when the support base plate (7) is assembled, welding connection holes (702) of the support base plate (7) are sequentially welded from the middle to the outside, and welding seams of the welding connection holes (702) cannot exceed the plane of the support base plate (7);
s10, machining a support connecting hole: a support connecting hole (6) coaxially opposite to the bolt connecting hole (701) is processed by taking the bolt connecting hole (701) on the support base plate (7) as a reference;
s11, final welding a support base plate and a steel bridge bottom plate: and (3) installing the steel bridge manufactured in the step (S10) in place, then welding a fillet weld between the support base plate (7) and the steel bridge bottom plate (1), and welding the support base plate (7) and the steel bridge bottom plate (1) into a whole.
2. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in the step S1 and the step S8, the section of the constraint beam (8) is of a hollow box-shaped structure; the left and right outer shafts of the constraint beam (8) in the length direction are symmetrically and uniformly distributed and provided with a plurality of constraint beam horse plates (801); the inner side of the top end of the restraining beam horse plate (801) is provided with a horse plate notch (802) with a concave arc-shaped structure.
3. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in the step S2, the bolt connecting hole (701) is a round hole; the welding connection hole (702) is a square hole, and the bolt connection hole (701) and the welding connection hole (702) are manufactured through numerical control cutting.
4. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in the step S3 and the step S5, the diaphragm plate (2) is welded with the steel bridge bottom plate (1) by adopting double-face slope corner welding seams.
5. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in the step S4, firstly welding the groove penetration fillet weld of the middle stiffening plate (3) and the first diaphragm plate (2); welding the close-fitting fillet weld of the middle stiffening plate (3) and the steel bridge bottom plate (1); wherein, the close-fitting fillet weld assembling clearance between the middle stiffening plate (3) and the steel bridge bottom plate (1) is less than or equal to 0.2mm.
6. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in step S6: firstly welding groove penetration fillet welds of the outer stiffening plate (4) and the diaphragm plate (2); welding the close-fitting fillet weld of the outer stiffening plate (4) and the steel bridge bottom plate (1); wherein, the close-fitting fillet weld assembling clearance between the outer stiffening plate (4) and the steel bridge bottom plate (1) is less than or equal to 0.2mm.
7. The method for controlling the flatness of the large-scale steel bridge support pad according to claim 5 or 6, wherein the method comprises the following steps: the stiffening plates are arranged at a distance of 0.2-0.3 m from the edge of the support base plate (7), and the stiffening plates are symmetrically arranged.
8. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in step S8, detecting flatness by adopting a steel plate ruler; and the flatness is less than or equal to 2mm.
9. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: in step S10, the support connection hole (6) is formed by flame cutting.
10. The method for controlling the flatness of the backing plate of the large-scale steel bridge support according to claim 1, which is characterized in that: the area of the backing plate of the large-sized steel bridge support is more than or equal to 8m 2 。
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|---|---|---|---|---|
| CN101372061A (en) * | 2008-09-28 | 2009-02-25 | 武汉船用机械有限责任公司 | Welding method of high mirror-finished sheet in bridge support sliding panel assembly |
| KR20180120927A (en) * | 2017-04-28 | 2018-11-07 | 한국철도기술연구원 | Steel plate girder through bridge for noise reduction and the construction method thereof |
| CN109530949A (en) * | 2018-12-26 | 2019-03-29 | 江苏中铁山桥重工有限公司 | A kind of large-scale bridge support backing plate welding method |
| CN111485489A (en) * | 2020-06-03 | 2020-08-04 | 中铁宝桥集团有限公司 | Large bridge support base plate and connecting method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372061A (en) * | 2008-09-28 | 2009-02-25 | 武汉船用机械有限责任公司 | Welding method of high mirror-finished sheet in bridge support sliding panel assembly |
| KR20180120927A (en) * | 2017-04-28 | 2018-11-07 | 한국철도기술연구원 | Steel plate girder through bridge for noise reduction and the construction method thereof |
| CN109530949A (en) * | 2018-12-26 | 2019-03-29 | 江苏中铁山桥重工有限公司 | A kind of large-scale bridge support backing plate welding method |
| CN111485489A (en) * | 2020-06-03 | 2020-08-04 | 中铁宝桥集团有限公司 | Large bridge support base plate and connecting method thereof |
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