CN117206826A - Full-bolting arch rib double-splicing coupling manufacturing method - Google Patents
Full-bolting arch rib double-splicing coupling manufacturing method Download PDFInfo
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Abstract
The invention provides a manufacturing method of double-spliced coupling of full-bolted arch ribs, which belongs to the technical field of arch bridge steel structure processing and comprises the following steps: step 1, manufacturing a shell ring; step 2, manufacturing an I-shaped web member; step 3, manufacturing a box-type web member; step 4, manufacturing a string tube; step 5, manufacturing truss sheets; step 6, manufacturing arch rib sections; and 7, manufacturing the wind brace. The full-bolting arch rib double-splicing coupling manufacturing method simplifies the ultra-large span steel pipe arch rib splicing process, effectively solves the problems of difficult control of arch rib installation accuracy, large field installation workload, complex operation and the like, not only generates huge economic benefits and saves construction period, but also improves the processing and manufacturing accuracy of the full-bolting arch rib, ensures the high-altitude smooth butt installation of the arch rib, improves the bridge linear accuracy, realizes the progress of high-accuracy installation of the large span steel pipe arch bridge arch rib, and provides a new technical support for the development of a steel pipe concrete arch bridge to a larger span and full-bolting structure.
Description
Technical Field
The invention relates to the technical field of arch bridge steel structure processing, in particular to a double-splicing coupling manufacturing method of a full-bolting arch rib.
Background
The steel tube concrete arch bridge has the advantages of light dead weight, high structural rigidity, high bearing capacity, low construction cost and the like, and more bridges adopt a steel tube arch bridge scheme. When the traditional steel pipe arch bridge is designed, the design concept of full welding is mainly adopted, and the arch rib processing mainly adopts a horizontal splicing method. The arch rib is generally divided into left and right webs, and the webs are connected through a wind brace, so that the overall size is overlarge; when the horizontal splicing processing method is adopted, the wind brace cannot participate in matched manufacturing; the wind brace is required to be matched and cut and welded on the high-altitude site, the site workload is large, and the safety risk is high.
Along with the national development of bridge assembly, industrialization and standardization, more and more steel pipe arch bridges gradually adopt bolting schemes, and the positioning and mounting tolerance deviation of the steel structure is controlled within 3mm, which brings better requirements for the processing and manufacturing of the steel structure and the field mounting precision. The traditional welding system arch bridge has no arch rib processing method capable of meeting the precision requirement. The method is characterized in that the fully-assembled bolted arch rib is mainly assembled in a cantilever manner on site, high-altitude installation and adjustment measures are very limited, so that the arch rib installation accuracy is difficult to control, the on-site installation workload is large and complicated, and the installation accuracy of the arch rib is determined to a great extent by the accuracy of steel structure processing, so that a steel structure processing and manufacturing method based on the fully-bolted arch rib is needed, the manufacturing accuracy of the fully-bolted arch rib is improved, the high-altitude installation is ensured to be smoothly carried out, the rapid closure of the arch rib is realized, and the cantilever assembly safety risk is reduced.
Disclosure of Invention
The invention aims to provide a full-bolting arch rib double-splicing coupling manufacturing method, which solves the technical problems of difficult control of the existing arch rib installation precision, large field installation workload and complexity. The invention adopts horizontal splicing coupling manufacturing and vertical splicing coupling manufacturing to process the full-bolted arch rib, improves the processing and manufacturing precision of the full-bolted arch rib, ensures the smooth butt joint installation of the arch rib at high altitude and improves the linear precision of the bridge.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the manufacturing method of the full bolting arch rib double-splicing coupling comprises the following steps:
step 1, manufacturing a cylindrical shell section, namely determining the unfolding dimension line shape of the main string cylindrical shell section according to lofting, cutting and blanking, pre-pressing and bending, rolling, welding and rounding the pretreated steel plate to obtain the cylindrical shell section;
step 2, manufacturing an I-shaped web member, namely precisely blanking an upper flange plate, a lower flange plate and a web plate, then scribing web plate positioning lines on the upper flange plate and the lower flange plate, assembling the upper flange plate, the lower flange plate and the web plate according to the lines, positioning and welding, scribing hole group positioning lines on a special platform, and drilling, numbering and marking the holes to obtain the I-shaped web member;
step 3, manufacturing a box web member, namely precisely blanking a top plate, a bottom plate, a partition plate and a web plate, marking partition plate, web plate and top plate positioning lines on the bottom plate, assembling the partition plate, the web plate and the top plate according to the lines, positioning and welding, marking hole group positioning lines on a special platform, and drilling, numbering and direction marking to obtain the box web member;
step 4, manufacturing a string pipe, namely drawing a ground sample line according to a cylinder section line shape, erecting a string pipe jig frame, mounting the cylinder section on the string pipe jig frame, enabling a cylinder section datum line to be aligned with the ground sample line, carrying out positioning welding on the cylinder section, transferring the cylinder section to a rotary jig frame for welding lines, and returning to the string pipe jig frame for checking the line shape to obtain the string pipe;
step 5, manufacturing truss sheets, namely drawing truss sheet ground sample lines and erecting truss sheet horizontal splicing jig frames according to stress-free manufacturing lines, adjusting arch rib joints and the lines after string tubes are mounted with the tyres, positioning and welding the I-shaped web members and the box-shaped web members with the tyres after string tubes are mounted with the tyres in sequence and checked without errors, and welding upright column joints on the string tubes to obtain truss sheets;
step 6, manufacturing arch rib sections, namely after symmetrically positioning and welding transverse connecting rods on the lower truss sheets, installing the upper truss sheets in a hammer line mode, positioning and welding the upper truss sheets and the transverse connecting rods to obtain the arch rib sections, leaving the common sections on a jig frame, and completing the next round of manufacturing according to the steps;
and 7, manufacturing the air stay, namely, after string pipes and air stay tire lines are lofted in a vertically spliced field, installing a vertically spliced tire frame, turning over two sections of horizontally spliced arch rib sections by 90 degrees, then feeding the tire, positioning and welding the air stay between the two sections of the arch rib sections to obtain an arch rib, and leaving a common section on the tire frame, thereby completing the next round of manufacturing according to the steps.
Further, in the step 1, the pre-press bending is to pre-press the butt welding seam position of the steel plate by using a hydraulic press, the welding is to perform longitudinal seam welding on the steel plate by using an automatic submerged arc welding machine, and the obtained cylindrical shell sections are clearly marked according to the index lines of 0 degrees, 90 degrees, 180 degrees and 270 degrees, numbered and direction marked.
Further, in step 2, the precision of the web precision blanking is calculated according to negative tolerance, and the positioning welding is performed by using CO 2 And welding the fillet welds between the web plate and the upper and lower flange plates by gas shielded welding and correcting welding deformation.
Further, in step 3, the tack welding is performed using CO 2 Welding the fillet weld between the partition plate and the bottom plate, the fillet weld between the web plate and the bottom plate and the fillet weld between the web plate and the top plate by gas shielded welding, and correcting welding deformation.
Further, in step 4, the welding seam is to start the roller tire frame on the rotating tire frame, and the welding circumferential welding seam is applied to the cylinder section subjected to the positioning welding by using an automatic submerged arc welding machine.
Further, in step 5, after the i-web member and the box-web member are mounted on the truss horizontal splicing jig frame according to the ground pattern line and positioned, the box-web member is vertically welded between the chord tubes through the node plates, the i-web member is obliquely welded between the chord tubes through the node plates, the chord tubes and the front corner weld of the node plates are subjected to positioning welding and welding deformation correction, the chord tubes and the back corner weld of the node plates are subjected to positioning welding and welding deformation correction by turning over, and then the upright post joints and the chord tube corner weld are subjected to positioning welding and welding deformation correction.
Further, in step 6, the cross links are respectively welded between the chord tubes, the i-web members and the box-web members of the upper and lower truss sheets.
Further, in step 7, the vertical assembly jig frame adopts a square pier as a main bearing structure, the crescent adjusting tooth plate elevation deviation is smaller than 1mm, the square pier plane size is 800×800mm, three high buttresses of 800mm, 1200mm and 1400mm are arranged for adjusting the main arch rib shape, the pre-assembly site is provided with a measuring table at a proper position, and the single assembly jig frame consists of 12 square piers.
Further, in step 7, the wind brace includes an X brace, an upper horizontal brace, an upper diagonal brace, a lower horizontal brace, and a lower diagonal brace, where the X brace, the upper horizontal brace, and the lower horizontal brace are respectively welded at one ends between the two arch rib sections, and the upper horizontal brace and the lower horizontal brace are respectively welded at the upper and lower sides of the X brace, the upper diagonal brace and the lower diagonal brace are respectively welded at the other ends between the two arch rib sections, and one end of the upper diagonal brace is welded on the upper horizontal brace, and one end of the lower diagonal brace is welded on the lower horizontal brace.
Further, after the arch rib is obtained, the projection position of the flange plate of the arch rib is determined on the arch rib according to the stress-free manufacturing line shape, the plate surface is fixed, then the stiffening rib at one end of the flange plate is welded on the chord tube and the plate surface respectively, and the welding seam between the plate surface and the stiffening rib is reserved at the other end, wherein the reserved gap is 0.5-1.5cm.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the full-bolting arch rib double-splicing coupling manufacturing method simplifies the ultra-large span steel pipe arch rib splicing process, effectively solves the problems of difficult control of arch rib installation accuracy, large field installation workload, complex operation and the like, not only generates huge economic benefits and saves construction period, but also improves the processing and manufacturing accuracy of the full-bolting arch rib, ensures the high-altitude smooth butt installation of the arch rib, improves the bridge linear accuracy, realizes the progress of high-accuracy installation of the large span steel pipe arch bridge arch rib, and provides a new technical support for the development of a steel pipe concrete arch bridge to a larger span and full-bolting structure.
Drawings
FIG. 1 is a schematic illustration of the manufacture of a shell ring of the present invention;
FIG. 2 is a schematic illustration of the manufacture of an i-web member of the present invention;
FIG. 3 is a schematic illustration of the manufacture of the box web member of the present invention;
FIG. 4 is a schematic illustration of the manufacture of a chord tube according to the present invention;
FIG. 5 is a schematic illustration of the fabrication of truss sheets and rib segments of the present invention;
fig. 6 is a schematic illustration of the manufacture of a wind brace of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
The manufacturing method of the full bolting arch rib double-splicing coupling comprises the following steps:
step 1, manufacturing a tube section, namely determining the expansion size line shape of a main chord tube section according to lofting, carrying out precise cutting and blanking on a pretreated steel plate by using numerical control, carrying out longitudinal seam welding by using an automatic submerged arc welding machine after tube coiling, and carrying out secondary rounding treatment on a tube coiling machine to obtain the tube section after the roundness meets the requirement; clearly marking the obtained cylinder section according to index lines of 0 degrees, 90 degrees, 180 degrees and 270 degrees, numbering and identifying the direction, wherein a cylinder section manufacturing schematic diagram is shown in figure 1;
step 2, manufacturing an I-shaped web member, namely precisely blanking an upper flange plate, a lower flange plate and a web plate, calculating the precision of the precise blanking of the web plate according to negative tolerance, then scribing web plate positioning lines on the upper flange plate and the lower flange plate, assembling the upper flange plate, the lower flange plate and the web plate according to the lines, and using CO 2 Fillet weld of gas shielded welding web and upper and lower flange platesCorrecting welding deformation, drawing a hole group positioning line on a special platform, and drilling, numbering and marking the hole group positioning line to obtain an I-shaped web member, wherein a manufacturing schematic diagram of the I-shaped web member is shown in figure 2;
step 3, manufacturing box web members, namely precisely blanking a top plate, a bottom plate, a partition plate and a web plate, marking partition plate, web plate and top plate positioning lines on the bottom plate, assembling the partition plate, the web plate and the top plate according to the lines, and using CO 2 Welding the partition plate and the bottom plate fillet weld, the web plate and the bottom plate fillet weld and the web plate and the top plate fillet weld and correcting welding deformation, drawing a hole group positioning line on a special platform, and drilling, numbering and direction marking to obtain a box-type web member, wherein a manufacturing schematic diagram of the box-type web member is shown in fig. 3;
step 4, manufacturing a string pipe, namely drawing a ground sample line according to a cylindrical shell section line shape, erecting a string pipe jig, mounting the cylindrical shell section on the string pipe jig, aligning a cylindrical shell section datum line with the ground sample line, carrying out positioning welding on the cylindrical shell section, transferring the cylindrical shell section onto a rotary jig, starting a roller jig, using an automatic submerged arc welding machine to apply a welding circumferential weld to the cylindrical shell section subjected to positioning welding, and returning to the string pipe jig after welding is finished to verify the line shape to obtain the string pipe, wherein a string pipe manufacturing schematic diagram is shown in fig. 4;
step 5, manufacturing truss sheets, namely drawing truss sheet ground sample lines according to stress-free manufacturing lines, erecting a truss sheet horizontal splicing jig frame, adjusting arch rib joints and lines after a chord tube is mounted with the tires, mounting an I-shaped web member and a box-shaped web member on the truss sheet horizontal splicing jig frame according to the ground sample lines for positioning after the chord tube is mounted with the truss sheet horizontal splicing jig frame, vertically welding the box-shaped web member between the chord tubes through a node plate, obliquely welding the I-shaped web member between the chord tubes through the node plate, performing positioning welding and correcting welding deformation on the front angle weld joints of the chord tubes and the node plate, performing positioning welding and correcting welding deformation on the back angle weld joints of the chord tubes and the node plate, performing positioning welding and correcting welding deformation on the upright post joints on the chord tube, and obtaining the truss sheets, wherein a truss sheet manufacturing schematic diagram is shown in fig. 5;
step 6, manufacturing arch rib segments, namely after symmetrically positioning and welding transverse connecting rods on lower truss sheets, respectively positioning and welding the transverse connecting rods between chord tubes, I-shaped web members and box-shaped web members of the upper truss sheets and the lower truss sheets, mounting the upper truss sheets in a hammer line manner, positioning and welding the upper truss sheets and the transverse connecting rods to obtain the arch rib segments, leaving a common segment on a tire frame, and completing the next round of manufacturing according to the steps, wherein a arch rib segment manufacturing schematic diagram is shown in fig. 5;
step 7, wind bracing manufacturing, namely after string pipes and wind bracing tire lines are lofted in a vertical splicing site, installing a vertical splicing tire frame, wherein the vertical splicing tire frame adopts a square pier as a main bearing structure, the top surface of the square pier is provided with a crescent adjusting tooth plate with elevation deviation smaller than 1mm, the plane size of the square pier is 800 multiplied by 800mm, three-height buttresses of 800mm, 1200mm and 1400mm are arranged for adjusting the shape of a main arch rib, a measuring table is arranged at a proper position of the pre-splicing site, and a single group of tire frame consists of 12 square piers; the method comprises the steps that after two sections of horizontally assembled arch rib sections are turned over by 90 degrees, an upper tire is arranged, an air brace is welded between the two sections of arch rib sections in a positioning mode, the air brace comprises an X brace, an upper horizontal brace, an upper diagonal brace, a lower horizontal brace and a lower diagonal brace, the X brace, the upper horizontal brace and the lower horizontal brace are respectively welded at one end between the two sections of arch rib sections in a positioning mode, the upper horizontal brace and the lower horizontal brace are respectively welded at the upper side and the lower side of the X brace, the upper diagonal brace and the lower diagonal brace are respectively welded at the other end between the two sections of arch rib sections, one end of the upper diagonal brace is welded on the upper horizontal brace, and one end of the lower diagonal brace is welded on the lower horizontal brace; the common section is left on a bench, the next round of manufacturing is completed according to the steps, and a wind brace manufacturing schematic diagram is shown in fig. 6; after the arch rib is obtained, the projection position of the flange plate of the arch rib is determined on the arch rib according to the stress-free manufacturing line shape, the plate surface is fixed, then the stiffening rib at one end of the flange plate is welded on the chord tube and the plate surface respectively, and the welding seam between the plate surface and the stiffening rib is reserved at the other end, wherein the reserved gap is 0.5-1.5cm.
Examples
A full bolting arch rib double-splicing coupling manufacturing method comprises the steps of determining the unfolding dimension line type of a cylindrical section according to stocking, carrying out numerical control precision cutting and blanking on a pretreated steel plate, carrying out pre-press bending on butt welding seam positions by using a hydraulic press, then adopting a three-roll shaft pipe coiling machine to carry out coiling, carrying out longitudinal seam welding by adopting an automatic submerged arc welding machine after pipe coiling, carrying out secondary rounding treatment on the pipe coiling machine, obtaining the cylindrical section after the roundness meets the requirement, carrying out clear identification on the cylindrical section according to 0 degree, 90 degree, 180 degree and 270 degree graduation lines, numbering and direction identification on the cylindrical section, wherein the length of the cylindrical section is smaller than 3m, the length difference between the cylindrical sections is smaller than 4mm, the height difference between the cylindrical sections is smaller than 5mm, and the cylindrical section processing permission control standard is shown in table 1:
table 1 shell ring process control index unit: mm (mm)
The upper and lower flange plates and the web are precisely cut by numerical control, the web blanking precision is calculated according to negative tolerance, then web positioning lines are drawn on the upper and lower flange plates, the upper and lower flange plates and the web are assembled according to the lines, and CO is used 2 Welding the fillet welds between the web and the upper and lower flange plates by gas shielded welding, correcting welding deformation, drawing a hole group positioning line on a special platform, and drilling, numbering and marking the hole group positioning line to obtain an I-shaped web member; cutting the top plate, the bottom plate, the partition plate and the web plate by adopting numerical control precision blanking, marking the positioning lines of the partition plate and the web plate on the bottom plate, assembling the partition plate and the web plate according to the lines and using CO 2 Welding the fillet weld between the partition plate and the bottom plate, the fillet weld between the web plate and the bottom plate by gas shielded welding, correcting welding deformation, assembling the top plate by wire and using CO 2 Welding the fillet weld between the web plate and the top plate by gas shielded welding, correcting welding deformation, drawing a hole group positioning line on a special platform, and drilling, numbering and marking the hole group positioning line to obtain the box-shaped web member; drawing a ground sample line according to a cylinder section line shape, erecting a long chord tube jig, then installing a first cylinder section on the chord tube jig, aligning a datum line on the first cylinder section with the ground sample line, tightly jacking and fixing the first cylinder section by using a long chord tube jig template, installing a second cylinder section on the long chord tube jig, aligning a tetrad line on the second cylinder section with the first cylinder section, ensuring that longitudinal joints are staggered by 90 degrees, aligning a datum line on the second cylinder section with the ground sample line, and using the long chord tube jig templateAfter the second cylinder section is tightly propped and fixed by the plate, carrying out positioning welding on the nodes of the first cylinder section and the second cylinder section, repeating the steps, sequentially lengthening the cylinder sections to obtain a string pipe, transferring the string pipe to a rotary jig, starting a roller jig, using an automatic submerged arc welding machine to apply a circumferential welding seam, returning to the lengthening jig to check the string pipe shape after the welding is finished, and ensuring that the string pipe length allowance deviation of the cylinder sections is shown in the table 2:
table 2 section lengthening control index unit: mm (mm)
Firstly, manufacturing a line shape according to stress-free, drawing a ground sample line, erecting a truss piece horizontal splicing jig frame, then installing a first string pipe on the truss piece horizontal splicing jig frame, aligning a datum line on the first string pipe with the ground sample line, tightly jacking and fixing the first string pipe by utilizing a truss piece horizontal splicing jig frame template, adjusting an arch rib joint and the line shape, installing a second string pipe on the truss piece horizontal splicing jig frame, aligning a datum line on the second string pipe with the ground sample line, and tightly jacking and fixing the second string pipe by utilizing the truss piece horizontal splicing jig frame template; after the positioning of the chord tube upper tire is checked, an I-shaped web member and a box-shaped web member are vertically installed between a first chord tube and a second chord tube through a node plate, the I-shaped web member and the box-shaped web member are installed on a truss piece horizontal splicing tire frame according to a ground sample line for positioning, then the chord tube and a node plate front angle welding seam are subjected to positioning welding and welding deformation correction, the chord tube and a web member node plate back angle welding seam are subjected to positioning welding and welding deformation correction by turning over, then upright post joints are installed on the first chord tube and the second chord tube according to a line shape, and the upright post joints and the chord tube angle welding seam are subjected to positioning welding and welding deformation correction; after the truss sheet is manufactured, measuring the levelness of the truss sheet by using a high-precision level gauge, ensuring that the measured deviation is smaller than 2mm, symmetrically installing transverse connecting rods on chord tubes of the truss sheet at the lower layer after the accuracy of the truss sheet at the lower layer meets the requirement, respectively positioning and welding the transverse connecting rods between the chord tubes, the I-shaped web members and the box-shaped web members of the truss sheet at the upper layer, positioning and welding deformation of the transverse connecting rods, the I-shaped web members and the box-shaped web members, checking the levelness, installing the truss sheet at the upper layer, controlling the arc linearity of arch ribs by a hammer line mode, fixing and limiting by adopting a truss sheet horizontal splicing jig frame, and ensuring the verticality after the sections are turned by 90 degrees by measuring the levelness of the truss sheet at the upper layer, positioning and welding the chord tubes and the angle welding joints of the transverse connecting rods and correcting the welding deformation after all the linear accuracy meets the requirement. After the previous round of horizontal splicing matching is completed, the common section is left on the truss piece horizontal splicing jig frame, the posture is adjusted according to the arch rib processing drawing, then the next round of matching manufacturing is completed by referring to the steps, the three-dimensional laser scanner is adopted to scan the horizontal splicing three-dimensional posture before each round of horizontal splicing, the three-dimensional posture of the common section in the next round is determined through simulation pre-splicing, so that the accuracy continuation of the horizontal splicing line shape is ensured, and meanwhile, the actual scanning model is modeled according to the vertical splicing posture, so that the vertical splicing section line shape is determined. The horizontal splicing coupling matching manufacturing method comprises the steps of accurately lofting horizontal unstressed lines of arch ribs in advance by adopting a tire line method, placing chord tubes and web members on a horizontal splicing tire frame, aligning the ground patterns, controlling the positions of two ends of a section, temporarily fixing the sections, and then applying the sections as web member nodes; the segments are matched according to the integral line shape under the limit of the field, and the line shape continuity is realized through the common matching segment.
Setting out chord tubes and air bracing tire lines in a vertically spliced field, accurately setting out ground sample lines according to a tire frame drawing, determining a vertical spliced arch rib axis, inner side and outer side edge lines, air bracing position lines and arch rib beam section port position lines, establishing an arch rib vertical splicing measurement control network, installing a vertically spliced tire frame, installing an arch rib section upper tire by using 2 100-ton gantry cranes, adjusting the position of a longitudinal joint, the verticality of the arch rib, the side bending and the upper chord elevation linearity, controlling the deviation of each component line of the arch rib and the ground sample lines within the standard requirements, turning over 90-DEG upper tire of two sections of horizontally spliced arch rib sections, performing joint measurement and inspection on the whole tire, and controlling the verticality of the arch rib section, the vertical splicing elevation linearity and diagonal line production values; the vertical splicing jig frame adopts a square pier as a main bearing structure, the elevation deviation of a crescent adjusting dental lamina is less than 1mm, the plane size of the square pier is 800 multiplied by 800mm, three heights of the square pier of 800mm, 1200mm and 1400mm are arranged for adjusting the shape of a main arch rib, a measuring table is arranged at a proper position in a pre-splicing site, a single group of jig frames consists of 12 square piers, a total station is adopted for paying off and positioning during segment splicing, the piers are fixed by using foundation bolts, a leveling instrument is used for measuring and determining the height of the dental lamina after the piers are fixed, the vertical splicing jig frame is used for vertically splicing arch ribs, the top surface of the piers of the jig frame is leveled, and the jig frames are arranged on the same straight line and as close to a stress point of the structure (the center line of a web rod) as possible; and (3) hoisting the upper tire to finish preliminary positioning, and adjusting the main arch rib sections according to the position of the ground pattern line and the measured data so that the arch rib positioning meets the standard requirements. The inspection items are: the side line of the inner side of the arch rib is bent sideways (the lower chord is checked with the ground sample line of the inner side, the upper chord is measured by a total station), the length of the arch rib (the ground sample line of the port position of the arch rib is measured), the verticality of the arch rib (the lower chord pipe is measured by a plumb), the elevation of the arch rib (the difference from the design linearity) and the diagonal line of the central section of the inner arch pipe are measured by the total station. Temporarily connecting a wind brace with the lower node plate and the single-side web plate, arranging steel back ribs or supporting frames to reduce welding deformation of the node plate, and carrying out wind brace positioning welding on arch rib sections after the upper tire is finished; the wind brace comprises an X brace, an upper horizontal brace, an upper inclined brace, a lower horizontal brace and a lower inclined brace, wherein the X brace is temporarily connected with a node plate and a web plate in advance, the lower horizontal brace and the lower inclined brace are firstly installed to a wind brace temporary jig frame and the lower node plate is subjected to backing welding, then the node plate is installed and fixed by a horse plate, the upper and lower node plates and an arch rib are welded through a welding seam, then the web plate at the other side of the node position is positioned and welded, when the node plate is welded, the lower horizontal brace and the lower inclined brace are opened with the node plate, so that the node plate can be deformed freely in the welding process, the arch rib is prevented from deforming, the X brace is integrally positioned and installed after the positioning welding of the horizontal brace and the lower inclined brace is completed, the stiffening plate is firstly arranged under the parallel node plate, then the lower node plate and the upper node plate are welded in a positioning manner, then the welding of the X brace node plate is completed, and after the X brace is installed, a long rod and a short rod are connected in a matching manner, and the upper horizontal brace and the upper inclined brace welding seam are welded according to the positioning and lower inclined brace welding method. And (3) after the arch rib flanges are subjected to blanking, drilling and surface milling according to the design, fastening each pair of arch rib flanges through temporary bolts to ensure that the arch rib flange disc surfaces are 100% closely attached, determining projection positions of the arch rib flange discs on the arch ribs according to stress-free manufacturing lines, fixing the disc surfaces, respectively welding stiffening ribs at one end of each flange disc on a chord tube and the disc surfaces, and reserving welding seams of the disc surfaces and the stiffening ribs at the other end, wherein a reserved gap is 0.5-1.5cm. And after the vertical splicing coupling matching manufacturing, turning over the sections by 90 degrees, vertically installing according to the bridge forming posture, installing a matched air support according to the tire-like line after the horizontal deviation and the position determination of the sections, temporarily connecting the node plate and the air support through a punching pin and a common bolt, welding the air support node plate, comprehensively rechecking the vertical splicing line shape after the welding is finished, and welding the flange stiffening plate after the qualification, thereby finishing the vertical matching manufacturing of the arch rib.
Scanning the vertical splicing line shape of the arch rib by using a laser scanner, fitting an actual theoretical model with a BIM model in a stress-free state, judging the three-dimensional precision of the model, and simultaneously controlling the position string tube misplacement quantity and the round total splicing length between the sections in a key way, wherein correction treatment is needed when the error is large; after the positioning of the arch rib is finished, the installation of the members such as the air brace is carried out, the measurement and the inspection are carried out on the whole after the installation and the welding are finished, in order to reduce the deformation in the welding process of the air brace node plate, the position of the air brace node is provided with an independent support, the matched air brace is disconnected in advance, and the welding is prevented from influencing the arch rib shape. Reserving a vertical splicing public segment, adjusting the posture of the public segment according to the vertical splicing linear requirement, judging whether the posture meets the requirement by adopting a three-dimensional laser scanner in the adjustment process so as to ensure the three-dimensional posture of 'N+1', realizing the precision transmission among different rounds, accurately judging the elevation of each jig frame of the next round according to the three-dimensional posture of the public segment before the next round of rib section is assembled according to the digital simulation assembly technology and controlling according to the elevation of the next round, thereby improving the efficiency of the alignment adjustment of the tire on the rib section, and repeating the steps to finish the matching manufacture of the subsequent round after the alignment of the public segment is finished.
The horizontal splicing and vertical splicing double-splicing coupling manufacturing process is adopted, and the three-dimensional laser scanning digital simulation splicing technology is matched, so that the splicing efficiency and precision are improved, and the arch rib is smoothly installed in the high altitude; when the member processed by the technology is lifted at high altitude, the member is restored and installed according to the vertical splicing state, the number of wind stay installation is 2 per day, compared with the welding for 4-5 days/each, the key line occupied by the wind stay installation is effectively avoided, the time of the arch rib large cantilever is greatly reduced, and the structural risk is effectively reduced.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A manufacturing method of double splicing coupling of full bolting arch ribs is characterized in that: the method comprises the following steps:
step 1, manufacturing a cylindrical shell section, namely determining the unfolding dimension line shape of the main string cylindrical shell section according to lofting, cutting and blanking, pre-pressing and bending, rolling, welding and rounding the pretreated steel plate to obtain the cylindrical shell section;
step 2, manufacturing an I-shaped web member, namely precisely blanking an upper flange plate, a lower flange plate and a web plate, then scribing web plate positioning lines on the upper flange plate and the lower flange plate, assembling the upper flange plate, the lower flange plate and the web plate according to the lines, positioning and welding, scribing hole group positioning lines on a special platform, and drilling, numbering and marking the holes to obtain the I-shaped web member;
step 3, manufacturing a box web member, namely precisely blanking a top plate, a bottom plate, a partition plate and a web plate, marking partition plate, web plate and top plate positioning lines on the bottom plate, assembling the partition plate, the web plate and the top plate according to the lines, positioning and welding, marking hole group positioning lines on a special platform, and drilling, numbering and direction marking to obtain the box web member;
step 4, manufacturing a string pipe, namely drawing a ground sample line according to a cylinder section line shape, erecting a string pipe jig frame, mounting the cylinder section on the string pipe jig frame, enabling a cylinder section datum line to be aligned with the ground sample line, carrying out positioning welding on the cylinder section, transferring the cylinder section to a rotary jig frame for welding lines, and returning to the string pipe jig frame for checking the line shape to obtain the string pipe;
step 5, manufacturing truss sheets, namely drawing truss sheet ground sample lines and erecting truss sheet horizontal splicing jig frames according to stress-free manufacturing lines, adjusting arch rib joints and the lines after string tubes are mounted with the tyres, positioning and welding the I-shaped web members and the box-shaped web members with the tyres after string tubes are mounted with the tyres in sequence and checked without errors, and welding upright column joints on the string tubes to obtain truss sheets;
step 6, manufacturing arch rib sections, namely after symmetrically positioning and welding transverse connecting rods on the lower truss sheets, installing the upper truss sheets in a hammer line mode, positioning and welding the upper truss sheets and the transverse connecting rods to obtain the arch rib sections, leaving the common sections on a jig frame, and completing the next round of manufacturing according to the steps;
and 7, manufacturing the air stay, namely, after string pipes and air stay tire lines are lofted in a vertically spliced field, installing a vertically spliced tire frame, turning over two sections of horizontally spliced arch rib sections by 90 degrees, then feeding the tire, positioning and welding the air stay between the two sections of the arch rib sections to obtain an arch rib, and leaving a common section on the tire frame, thereby completing the next round of manufacturing according to the steps.
2. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in the step 1, the pre-press bending is to pre-press the butt welding seam position of the steel plate by using a hydraulic press, the welding is to perform longitudinal seam welding on the steel plate by using an automatic submerged arc welding machine, and the obtained cylinder sections are clearly marked according to the index lines of 0 degrees, 90 degrees, 180 degrees and 270 degrees and are numbered and direction marked.
3. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in step 2, the precision of the accurate blanking of the web is calculated according to negative tolerance, and the positioning welding is realized by using CO 2 And welding the fillet welds between the web plate and the upper and lower flange plates by gas shielded welding and correcting welding deformation.
4. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in step 3, the tack welding is performed using CO 2 Fillet weld of gas shielded welding partition plate and bottom plate, web plate and bottom plateFillet welds and web and roof fillet welds and correct welding deformation.
5. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in step 4, the welding seam is to start the roller jig on the rotary jig, and the welding circumferential welding seam is applied to the cylinder sections subjected to the positioning welding by using an automatic submerged arc welding machine.
6. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in step 5, after the I-shaped web member and the box-shaped web member are installed on the truss piece horizontal splicing jig frame according to a ground pattern line to be positioned, the box-shaped web member is vertically welded between chord tubes through a node plate, the I-shaped web member is obliquely welded between the chord tubes through the node plate, the chord tubes are subjected to positioning welding and welding deformation correction with the front-face angle welding seam of the node plate, the chord tubes are subjected to positioning welding and welding deformation correction with the back-face angle welding seam of the node plate by turning over, and then the upright post joint is subjected to positioning welding and welding deformation correction with the chord tube angle welding seam.
7. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in step 6, the transverse connecting rods are respectively positioned and welded among the chord tubes, the I-shaped web members and the box-shaped web members of the upper truss sheet and the lower truss sheet.
8. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in the step 7, the vertical splicing jig frame adopts a square pier as a main bearing structure, the elevation deviation of a crescent adjusting tooth plate arranged on the top surface of the square pier is less than 1mm, the plane size of the square pier is 800 multiplied by 800mm, three high buttresses of 800mm, 1200mm and 1400mm are arranged for adjusting the shape of a main arch rib, a measuring table is arranged at a proper position of a pre-splicing site, and a single group of jig frame consists of 12 square piers.
9. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: in step 7, the wind brace comprises an X brace, an upper horizontal brace, an upper diagonal brace, a lower horizontal brace and a lower diagonal brace, wherein the X brace, the upper horizontal brace and the lower horizontal brace are respectively welded at one end between two arch rib sections in a positioning way, the upper horizontal brace and the lower horizontal brace are respectively welded at the upper side and the lower side of the X brace, the upper diagonal brace and the lower diagonal brace are respectively welded at the other end between two arch rib sections, one end of the upper diagonal brace is welded on the upper horizontal brace, and one end of the lower diagonal brace is welded on the lower horizontal brace.
10. The method for manufacturing the full bolted arch rib double-spliced coupling according to claim 1, wherein the method comprises the following steps: after the arch rib is obtained, the projection position of the flange plate of the arch rib is determined on the arch rib according to the stress-free manufacturing line shape, the plate surface is fixed, then the stiffening rib at one end of the flange plate is welded on the chord tube and the plate surface respectively, and the welding seam between the plate surface and the stiffening rib is reserved at the other end, wherein the reserved gap is 0.5-1.5cm.
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| CN202310952407.3A CN117206826A (en) | 2023-07-31 | 2023-07-31 | Full-bolting arch rib double-splicing coupling manufacturing method |
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| CN202310952407.3A CN117206826A (en) | 2023-07-31 | 2023-07-31 | Full-bolting arch rib double-splicing coupling manufacturing method |
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