CN111390419A - Manufacturing method of large-span steel pipe arch rib - Google Patents
Manufacturing method of large-span steel pipe arch rib Download PDFInfo
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- CN111390419A CN111390419A CN202010247528.4A CN202010247528A CN111390419A CN 111390419 A CN111390419 A CN 111390419A CN 202010247528 A CN202010247528 A CN 202010247528A CN 111390419 A CN111390419 A CN 111390419A
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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
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Abstract
The invention discloses a manufacturing method of a large-span steel pipe arch rib, which is characterized in that the manufacturing process of a large-span steel pipe arch is optimized, a single element is manufactured firstly, then an assembly is assembled, the assembly is prevented from being welded intensively, the welding deformation is reduced, and the manufacturing precision is improved. Through process control, the shell ring, the flange plate, the embedded plate, the main chord tube, the sheet-mounted unit element and the web member transverse-spaced unit element are all manufactured into standard elements, so that the process manufacturing inspection and the finished product management are facilitated; horizontal assembly is adopted, assembly welding is carried out step by step, and the processes influenced in the front and the back are carried out step by step, so that the cross influence of the processes is reduced, and high-precision manufacturing is realized; safe and comfortable assembly conditions are created, and the safety risk is reduced; meanwhile, dependence on large-tonnage hoisting equipment is avoided, and cost and resources are saved. The method realizes efficient and standard division, processing and manufacturing, ensures the construction quality of the arch rib of the concrete-filled steel tube arch bridge, and realizes safe and rapid hoisting and folding of the arch rib.
Description
Technical Field
The invention relates to the field of arch bridges, in particular to a method for manufacturing a large-span steel pipe arch rib.
Background
The steel tube concrete arch bridge creates favorable conditions for the construction of the large-span arch bridge due to the advantages that the steel tube concrete arch bridge can be used as a stiff framework for arch ring construction due to the light weight and the large rigidity of the steel tube, and the steel tube is a template, so that the steel tube concrete arch bridge is increased day by day. With the mature cable hoisting technology, the steel pipe concrete arch rib is pre-spliced into segments in a factory and then hoisted; the arch rib processing adopts the construction of first zero and then finishing, namely, parts are firstly blanked and then assembled into parts, and then the parts are assembled into segments on an assembly jig. The steel pipe concrete arch bridge is divided into sections during manufacturing, and the assembling and welding precision directly determines that the steel pipe arch rib is in a bridge line shape, the quality and the service life.
Dividing arch rib segments and parts of the concrete-filled steel tube arch bridge, namely determining the maximum hoisting capacity of cable hoisting, and further determining the specification of each part hoisted by the cable; and also determines the factory processing method and equipment configuration. How to realize high-efficient accurate interior processing, guarantee safe quick hoist and mount again and fold, ensure the line type of forming a bridge and quality, already stereotype in the division of section and spare part.
Therefore, an efficient method for processing and manufacturing the steel tube arch rib is needed, the construction quality of the steel tube concrete arch bridge arch rib is guaranteed, and the safe and rapid hoisting and folding of the arch rib are realized.
Disclosure of Invention
The invention aims to: aiming at the problems of how to realize high-efficiency and accurate inner field processing, ensure safe and quick hoisting and folding and ensure the shape and quality of a bridge formation line in the prior art, the method for manufacturing the large-span steel pipe arch rib is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a manufacturing method of a large-span steel pipe arch rib divides the arch rib into a plurality of sections, simultaneously carries out assembly rounds of the sections, reduces error transmission between an upper round and a lower round by reducing a matching section, the upper round and the lower round are connected by the matching section, the last round of the matching section is used as a last section and records data, the next round of the matching section is used as a first section, the sections are adjusted to be in a state before a tire is placed in the previous round, and seamless butt joint of a front linear type and a rear linear type is ensured;
the segment comprises a piece-mounted unit element, a web member diaphragm unit element, a single chord tube and a suspender, wherein the manufacture of the large-span arch rib adopts horizontal assembly, the assembly of the segment and the component is adjusted, the components are assembled into small unit elements in advance, the welding amount of the assembly is reduced, when the arch rib is assembled, a lower piece-mounted unit element is firstly positioned on a moulding bed and fixed by a template, then the web member diaphragm unit element is positioned according to a ground sample, an intersecting line joint is welded, a splayed strut connected with the main chord tube by the web member diaphragm is assembled and welded, after the welding of an intersecting line connected with the main chord tube is finished, the debugging and welding of a joint part flange is carried out, the suspender is arranged after the joint part is connected, the position of the suspender is lofted by a laser theodolite and a total station, the suspender is scribed and tapped, the suspender is installed, the position of the suspender is measured by the laser theodolite and the total station, when the total station is manufactured, a, the arch foot arch crown is respectively provided with a point, and the unit element welding seam are welded during manufacturing of the segment assembly;
the sheet assembly unit consists of two main chord pipes and connected parallel pipes, the jig frame is checked after the sheet assembly unit is subjected to tire setting each time, the elevation is measured again, the relative elevation and the axis of the main chord pipes and the parallel pipes are adjusted in place, the welding shrinkage is reserved during assembly, the axis, the elevation and the weld gap are adjusted during parallel assembly, intersecting line welding is carried out after the inspection is finished, and symmetrical welding is carried out during welding;
the web member transverse-separating unit piece consists of a web member connecting the upper main chord tube and the lower main chord tube and a stay bar between the web members, wherein the web member stay bar connected with the main chord tubes needs to be installed and welded when the segment assembly is manufactured;
the main chord tube is formed by sequentially connecting a plurality of tube sections, a linear template is arranged below the tube section, the tube sections are equally divided into 4-5 sections, welding seams between the sections are positioned and welded on a main chord tube unit jig frame, allowance is reserved at one section of the arch springing side, and allowance cutting is carried out after the later-stage welding seams are shrunk and deformed;
the lengths of the cylinder sections are consistent, and the shrimp bending angle theta is determined to enable theta to be less than 0.04D/1, wherein D is the diameter length of the cylinder section, and 1 is a quarter of the length of the cylinder section; the cylindrical sections are divided into two types, one type is the cylindrical section with two ends vertical to the axial center line of the cylindrical section and a rectangular expansion surface, the other type is the cylindrical section with two ends forming an included angle theta with the axial center line of the cylindrical section and two ports of the expansion surface being curves; and (3) alternately arranging the two types of the cylindrical sections, and butt-welding according to the shrimp bending angle theta to ensure that the pipe sections spliced by the cylindrical sections have curvature.
Preferably, the segments are connected through the flange plate, the flange plate is manufactured into a standard part, the flange plate is installed and adjusted after the welding of the other parts of the arch rib except the hanger rod is finished, the spatial projection position of the flange plate is measured, the control error is +/-1 mm, and the control error is +/-2 mm in the gap between the flange plate stiffening plate and the welding line of the main chord tube.
Preferably, the matching section is taken as the last section in the previous round, and the recorded data comprises axis deviation, elevation deviation, boom position deviation and overall size.
Preferably, the parameters of the jig frame are calculated, the strength, the rigidity and the stability of the jig frame are ensured, the control error of the elevation of the jig frame is +/-1 mm, the elevation of a hoisting monitoring point is ensured to be correct, and the hoisting is guided accurately.
Preferably, before the parallel connection assembly, the welding seam position is ground, and the grinding area is widened.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the manufacturing method of the large-span steel pipe arch rib, disclosed by the invention, the manufacturing process of the large-span steel pipe arch is optimized, the single element is manufactured firstly, and then the assembly is assembled, so that the intensive welding of the assembly is avoided, the welding deformation is reduced, and the manufacturing precision is improved. Through process control, the shell ring, the flange plate, the embedded plate, the main chord tube, the sheet-mounted unit element and the web member transverse-spaced unit element are all manufactured into standard elements, so that the process manufacturing inspection and the finished product management are facilitated; horizontal assembly is adopted, assembly welding is carried out step by step, and the processes influenced in the front and the back are carried out step by step, so that the cross influence of the processes is reduced, and high-precision manufacturing is realized; safe and comfortable assembly conditions are created, and the safety risk is reduced; meanwhile, dependence on large-tonnage hoisting equipment is avoided, and cost and resources are saved. The method realizes efficient and standard division, processing and manufacturing, ensures the construction quality of the arch rib of the concrete-filled steel tube arch bridge, and realizes safe and rapid hoisting and folding of the arch rib.
Drawings
FIG. 1 is a schematic structural view of the shell section of the present invention;
FIG. 2 is a schematic structural view of the main chord tube of the present invention;
FIG. 3 is a schematic view showing the structure of the sheet-packed unit according to the present invention;
FIG. 4 is a schematic structural diagram of the web member horizontal spacer unit piece according to the present invention;
FIG. 5 is a schematic representation of the construction of the segment of the present invention;
FIG. 6 is a schematic view of the structure of the inter-segment connecting portion according to the present invention;
fig. 7 is a schematic structural view of the segment assembly of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1 to 7, the method for manufacturing a large-span steel pipe arch rib according to the present invention divides the arch rib into a plurality of segments, and according to the size of the field, the segments are assembled in an internal field by 2+1 (two segments and one matching segment), 3+1 (three segments and one matching segment), or even full-bridge half-assembly or full-bridge complete-assembly. The selection of the assembly turns is selected according to the field arrangement of a processing plant and the requirement of the construction period, and a plurality of assembly assembling turns can be developed simultaneously, so that the matching sections are reduced as much as possible, and the error transmission between the upper and lower turns is reduced. The upper round and the lower round are connected through the matching section, the matching section is used as the last section in the previous round, all data (axis deviation, elevation deviation, suspender position deviation and overall size) are recorded, the next section is used as the first section, the section is adjusted to be in a state before the tire is placed in the previous round, and seamless butt joint of the front and the rear linear types is ensured. The segment parts are connected through flanges, the flanges are manufactured into standard parts, the flanges are installed and adjusted after all welding (except for the hanger rods) of the arch ribs are finished, the spatial projection position of the flanges is measured, the control error is +/-1 mm, and the control error is +/-2 mm in the gap between the stiffening plates of the flanges and the welding seams of the main chord tubes.
The segment consists of a piece-mounted unit element, a web member transverse-spaced unit element, a single chord tube and a suspender; the manufacturing of the large-span arch rib adopts horizontal assembly, the assembly sections and the component composition are adjusted, the parts are assembled into small unit pieces in advance, and the welding amount of the assembly is reduced. When assembling the arch rib, the lower single sheet assembling unit is firstly positioned on the moulding bed and is blocked by the template. Then the web member horizontal spacing unit pieces are positioned according to the ground sample, and the intersecting line joint is welded. And assembling and welding the splayed brace connected with the web member transverse partition and the main chord tube. After the welding of the intersecting line connected with the main chord tube is finished, debugging and welding of the flange plate of the joint part are carried out; the jib is installed and is gone on after joining in marriage the part connection, carries out accurate laying-out to the jib position through laser theodolite and total powerstation, and the trompil is drawn a line, then carries out the jib installation, and its position is measured to reuse laser theodolite and total powerstation. When the assembly is manufactured, the hoisting monitoring points are placed at the bottom of the main chord tube at the lower side of the jig frame, and a point is arranged at each arch foot arch crown; the jig frame needs to be calculated to ensure the strength, rigidity and stability of the jig frame; the elevation control error of the jig frame is +/-1 mm, so that the elevation of a hoisting monitoring point is ensured to be correct, and accurate hoisting is guided; the unit piece and the unit piece weld are welded at the time of segment assembly manufacturing.
The sheet-packed unit element consists of two main chord pipes and connected parallel pipes, a jig frame is manufactured in a place with a flat and firm terrain, sinking deformation is avoided, the jig frame is checked after the sheet-packed unit element is subjected to tire sinking every time, and the elevation is measured again. The relative elevation and the axis of the main chord pipe and the parallel pipe are adjusted in place, the welding shrinkage is reserved according to actual experience during assembly, and the adjustment is observed in real time. Before the parallel connection assembly, the position of a welding line is polished completely, the polishing area is widened to be beyond 30mm, and during the parallel connection assembly, the axis, the elevation and the gap of the welding line are adjusted. And after the inspection is finished, intersecting line welding is carried out, and during welding, welding is symmetrically carried out. During grinding, the welding seam is bent and ground into a radian with r being 8, so that the welding seam is smooth and can not damage the base metal when being cut and marked.
The web member diaphragm unit element is composed of web members connected between the upper main chord tube and the lower main chord tube and supporting rods connected between the web members, wherein the web member supporting tubes connected with the main chord tubes need to be installed and welded when the segment assembly is manufactured, and the installation, the fixation and the adjustment are convenient.
The main chord tube is formed by sequentially connecting a plurality of tube sections, the shrimp elbow with the whole length can be divided into one section or a plurality of sections according to the weight and the length, a linear template is arranged below the tube section, the tube sections are equally divided into 4-5 sections, and welding seams among the sections are welded on the jig frame of the main chord tube unit in a positioning mode. Certain allowance is reserved at one section of the arch springing side, allowance cutting is carried out after later-stage welding seam shrinkage deformation is finished, the size of the connecting section is guaranteed to be accurate, and the embedding section is quickly and accurately installed when the connecting section is convenient to hoist.
When the shell ring is divided, the length of the shell ring is as consistent as possible, the specification of the plate is minimized, the shell ring is convenient to machine and form, the circular seam is avoided from the node, and the welding stress of the node is reduced. Determining a bending angle theta of the shrimp, wherein the angle theta is smaller than 0.04D/1, D is the diameter length of the cylindrical shell, 1 is the length of a quarter of the cylindrical shell, the cylindrical shell is divided into two types, one type is the cylindrical shell with two ends vertical to the axial center line of the cylindrical shell and a rectangular expansion surface, and the cylindrical shell is used for making a transition groove when the wall thickness is thicker; the other type is a cylindrical section with two ends forming an included angle theta with the axial center line of the cylindrical section and two ports of the spread surface being curved, and the cylindrical section is used for forming a transition groove without manufacturing a transition groove when the wall thickness is thin; and (3) alternately arranging the two types of shell sections, and butt-welding according to the shrimp bending angle theta to ensure that the pipe sections formed by splicing the shell sections reach a certain curvature and achieve primary bending.
By optimizing the manufacturing process of the large-span steel pipe arch, the manufacturing method of the large-span steel pipe arch rib provided by the invention has the advantages that the single element is manufactured firstly, then the assembly is assembled, the intensive welding of the assembly is avoided, the welding deformation is reduced, and the manufacturing precision is improved. Through process control, the shell ring, the flange plate, the embedded plate, the main chord tube, the sheet-mounted unit element and the web member transverse-spaced unit element are all manufactured into standard elements, so that the process manufacturing inspection and the finished product management are facilitated; horizontal assembly is adopted, assembly welding is carried out step by step, and the processes influenced in the front and the back are carried out step by step, so that the cross influence of the processes is reduced, and high-precision manufacturing is realized; safe and comfortable assembly conditions are created, and the safety risk is reduced; meanwhile, dependence on large-tonnage hoisting equipment is avoided, and cost and resources are saved. The method realizes efficient and standard division, processing and manufacturing, ensures the construction quality of the arch rib of the concrete-filled steel tube arch bridge, and realizes safe and rapid hoisting and folding of the arch rib.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A manufacturing approach of the steel tube arch rib of the large-span, characterized by, divide the arch rib into several sections, develop several section assemblies to assemble the round at the same time, reduce the error transmission between the upper and lower round through reducing the matching section, connect through matching the section between the upper and lower round, the last round of matching section is regarded as the last section, record data, the matching section is regarded as the first section in the next section, adjust the section to the state before the tire of the previous round, guarantee the seamless butt joint of the front and back linear type;
the segment comprises a piece-mounted unit element, a web member diaphragm unit element, a single chord tube and a suspender, wherein the manufacture of the large-span arch rib adopts horizontal assembly, the assembly of the segment and the component is adjusted, the components are assembled into small unit elements in advance, the welding amount of the assembly is reduced, when the arch rib is assembled, a lower piece-mounted unit element is firstly positioned on a moulding bed and fixed by a template, then the web member diaphragm unit element is positioned according to a ground sample, an intersecting line joint is welded, a splayed strut connected with the main chord tube by the web member diaphragm is assembled and welded, after the welding of an intersecting line connected with the main chord tube is finished, the debugging and welding of a joint part flange is carried out, the suspender is arranged after the joint part is connected, the position of the suspender is lofted by a laser theodolite and a total station, the suspender is scribed and tapped, the suspender is installed, the position of the suspender is measured by the laser theodolite and the total station, when the total station is manufactured, a, the arch foot arch crown is respectively provided with a point;
the sheet assembly unit consists of two main chord pipes and connected parallel pipes, the jig frame is checked after the sheet assembly unit is subjected to tire setting each time, the elevation is measured again, the relative elevation and the axis of the main chord pipes and the parallel pipes are adjusted in place, the welding shrinkage is reserved during assembly, the axis, the elevation and the weld gap are adjusted during parallel assembly, intersecting line welding is carried out after the inspection is finished, and symmetrical welding is carried out during welding;
the web member transverse-separating unit piece consists of a web member connecting the upper main chord tube and the lower main chord tube and a stay bar between the web members, wherein the web member stay bar connected with the main chord tubes needs to be installed and welded when the segment assembly is manufactured;
the main chord tube is formed by sequentially connecting a plurality of tube sections, a linear template is arranged below the tube section, the tube sections are equally divided into 4-5 sections, welding seams between the sections are positioned and welded on a main chord tube unit jig frame, allowance is reserved at one section of the arch springing side, and allowance cutting is carried out after the later-stage welding seams are shrunk and deformed;
the lengths of the cylinder sections are consistent, and the shrimp bending angle theta is determined to enable theta to be less than 0.04D/l, wherein D is the diameter length of the cylinder section, and l is a quarter of the length of the cylinder section; the cylindrical sections are divided into two types, one type is the cylindrical section with two ends vertical to the axial center line of the cylindrical section and a rectangular expansion surface, the other type is the cylindrical section with two ends forming an included angle theta with the axial center line of the cylindrical section and two ports of the expansion surface being curves; and (3) alternately arranging the two types of the cylindrical sections, and butt-welding according to the shrimp bending angle theta to ensure that the pipe sections spliced by the cylindrical sections have curvature.
2. The manufacturing method according to claim 1, wherein the segments are connected by flanges, the flanges are made into standard pieces, the installation and adjustment of the flanges are performed after the welding of the other parts of the arch rib except the hanger rods is completed, the spatial projection position of the flanges is measured, the control error is +/-1 mm, and the gap between the stiffening plates of the flanges and the welding lines of the main chord pipes is +/-2 mm.
3. The method of manufacturing of claim 1, wherein the matching section is the last section in the previous run, and the recorded data includes axis misalignment, elevation misalignment, boom position misalignment, and overall dimensions.
4. The manufacturing method according to claim 1, wherein the parameters of the jig frame are calculated to ensure the stability of the strength and the rigidity of the jig frame, the control error of the elevation of the jig frame is +/-1 mm, the elevation of a hoisting monitoring point is ensured to be correct, and the accurate hoisting is guided.
5. The manufacturing method according to any one of claims 1 to 4, wherein before the parallel assembling, the weld positions are ground and the ground areas are widened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010247528.4A CN111390419A (en) | 2020-03-31 | 2020-03-31 | Manufacturing method of large-span steel pipe arch rib |
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| CN202010247528.4A CN111390419A (en) | 2020-03-31 | 2020-03-31 | Manufacturing method of large-span steel pipe arch rib |
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Cited By (1)
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| CN115365690A (en) * | 2021-05-19 | 2022-11-22 | 南通振华重型装备制造有限公司 | Construction method of large-scale steel bridge S690 high-strength steel large-section box type arch rib |
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