CN105040567A - Interchange steel bridge and manufacture method thereof - Google Patents
Interchange steel bridge and manufacture method thereof Download PDFInfo
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- CN105040567A CN105040567A CN201510225435.0A CN201510225435A CN105040567A CN 105040567 A CN105040567 A CN 105040567A CN 201510225435 A CN201510225435 A CN 201510225435A CN 105040567 A CN105040567 A CN 105040567A
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Abstract
The invention relates to an interchange steel bridge, and particularly to the interchange steel bridge and a manufacture method thereof. The interchange steel bridge belongs to the field of steel structures. The interchange steel bridge comprises a base plate unit, baffle plate units, longitudinal web units, a top plate unit and a cantilever unit. The longitudinal web plates are arranged above the base plate unit. Each longitudinal web plate is internally provided with a baffle plate unit. The top plate unit is arranged above the baffle plate units and the longitudinal web units. One side of the top plate unit is provided with the cantilever unit. The manufacture method comprises the following steps of laying a supporting moulding bed, testing the moulding bed, forming the interchange steel bridge, splicing the baffle plate unit at a middle position, performing one-time splicing on the longitudinal web plate at the middle position, splicing the baffle plate units at sides, performing secondary splicing on the longitudinal web units at the sides, splicing the top plate unit, splicing the cantilever unit, and performing quality detection on a steel bridge box girder. The interchange steel bridge and the manufacture method thereof have advantages of compact structure, high splicing precision, effective splicing strength improvement, and effective line type improvement of the manufactured bridge.
Description
Technical field
The present invention relates to a kind of grade separation steel bridge, particularly relate to a kind of interchange steel bridge and preparation method thereof, belong to field of steel structure.
Background technology
Steel bridge unit of the prior art cannot be produced by batch, and each highway steel bridge unit produced exists the difference of individual character, multiple highway steel bridge unit cannot be made to carry out good splicing, cause the reduction of functional performance and security performance.
Summary of the invention
The present invention mainly solves the deficiencies in the prior art, provides a kind of compact conformation, and the precision of being carried out steel bridge by support jig is shaping, a kind of interchange steel bridge meeting batch production requirements and preparation method thereof.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of interchange steel bridge, comprise bottom board unit, separator unit, vertical web unit, top plate unit and choose arm unit, the top of described bottom board unit is provided with vertical web unit, separator unit is provided with in described vertical web unit, the top of described separator unit and vertical web unit is provided with top plate unit, and a side of described top plate unit is provided with chooses arm unit.
As preferably, described bottom board unit comprises the base plate in dislocation splicing distribution, and described base plate is provided with base plate I type stiffening rib;
Described vertical web unit comprises equally distributed vertical web, and the bottom of described vertical web is connected between adjacent bottom plates I type stiffening rib;
Described separator unit comprises median septum and side partition, median septum and the side partition of uniform intervals distribution is provided with between described vertical web, described median septum and side partition are interspersed, the median septum of cross direction profiles is the distribution of same linearity, the side partition of cross direction profiles is the distribution of same linearity, described median septum and the bottom of side partition are respectively equipped with increment bottom the dividing plate of locating with the clamping of base plate I type stiffening rib phase, and described median septum and the top of side partition are respectively equipped with dividing plate top increment;
Described top plate unit comprises the top board in dislocation splicing distribution, and the bottom of described top board is provided with the top board fixed end fixed with dividing plate top increment, vertical web top;
Described arm unit of choosing comprises and chooses arm plate, and described chooses the outer wall that arm plate is located at top plate unit, and the top on the described top and top board of choosing arm plate is that same level line distributes.
A preparation method for interchange steel bridge, carries out according to the following steps:
(1), the laying of support jig:
1, figure is set according to grade separation steel bridge support jig, releases the projection line supporting loose tool and position line on the ground;
Support jig adjacent transverse centre of location line should control in the scope of ± 0.5mm along the spacing deviation of grade separation steel bridge longitudinal direction;
2, arrange moulding bed according to the ground line-transect of support jig, first arrange the base of support jig, for preventing the overall line style of the moving influence grade separation steel bridge of support jig, base and ground adopt studs to be connected and fixed;
3, the base of support jig is arranged also after the assay was approved, then the centre of location line of the horizontal stroke on base, longitudinal beam is migrated to the upper surface of base, then according to centre of location line and the projected boundary line supporting loose tool, longitudinally horizontal stroke, longitudinal beam is located successively along steel bridge, and adjust center line and be welded and fixed after overlapping, the center distance deviation of the adjacent transverse beam after fixing must not be greater than ± 1mm;
4, after the transverse beam of support jig and longitudinal beam have been laid on request, check whether firm, should guarantee can not be moved in assembling of steel bridge process; Then detect, adjust the flatness of moulding bed control panel supporting surface, flatness allowable variation is not more than 5mm;
5, support jig design drawing requirement, transverse beam is released moulding bed control panel position line, and with moulding bed control panel position line for benchmark, set gradually loose tool control panel, control panel takes CNC cutting, must through Precision Machining with bridge base plate contact surface;
Fetal membrane control panel is arranged should meet following requirement: horizontal line is consistent with the bridge lateral gradient, is 2% horizontal wall inscription; Longitudinal line is that steel bridge becomes bridge line style; Fixedly be welded on crossbeam after meeting the requirements;
(2), moulding bed detects:
After the support jig of grade separation steel bridge has been laid, total powerstation is utilized to carry out the detection of each measuring control point coordinate on moulding bed control panel, and record survey data, then surving coordinate Value Data is imported computer, showing that steel bridge moulding bed arranges line style, comparing, when there is deviation with the bridge line style that becomes of designing requirement, local control panel is adjusted, meets until completely the same and be designed to the requirement of bridge line style;
(3), grade separation steel bridge is shaping:
1, bottom board unit is assembled: after support jig is assembled, and the base plate be up to the standards is hung on support jig successively, fixed sample reference line over the ground, and utilizes interim Karma or spot welding to fix after being close to moulding bed control panel, to obtain good one-tenth bridge line style;
2, each base plate marks center line, and be that benchmark marks base plate I type stiffening rib and web cell location line with center line, lay base plate I type stiffening rib successively by reference line position and spot welding is fixed;
3, CO is adopted
2gas shielded arc welding, base plate I type stiffening rib is welded, symmetrical welding from the middle to both ends, be welded to and stop welding from 200mm place, base plate I type stiffening rib termination, after weld seam is cooled to room temperature completely, detect the spacing of base plate I type stiffening rib, with the verticality of base plate, the rate that falls into that separator unit place base plate I type stiffening rib detects model should reach 100%, if the spacing of base plate I type stiffening rib does not meet technical requirements, spot heating mode is adopted to correct, adding heat straightening temperature is 700 DEG C ~ 800 DEG C, and maximum heating temperature must not more than 900 DEG C;
4, the splicing of bottom board unit adopts CO
2gas shielded arc welding or CO
2gas shielded arc welding bottoming, Lincoln weld filling and capping;
Base plate splicing welding sequence is: the longitudinal weld longitudinal seam first welding base plate splicing, then welds horizontally-spliced weldering, the spacing of postwelding repetition measurement base plate I type stiffening rib, ensures that the rate that falls into detecting model reaches 100%;
(4), first assembled to the separator unit of interposition:
1, the separator unit of steel bridge case beam has steel flanged beam and open web type two kinds, and wherein median septum is open web type, and side partition is steel flanged beam;
Be positioned at middle separator unit to divide because beam section manufactures section, break it into two, before assembled, utilize interim code plate that separator unit is linked to be entirety as requested;
2, separator unit is hung on assembled moulding bed, determine to fix positioning welding after assembling position line, separator unit should be adjacent to assembling with bottom board unit;
For ensureing the stability of location rear bulkhead unit and the verticality with bottom board unit, behind location, temporary support need be added in separator unit both sides;
(5), first once assembled to the vertical web of interposition:
1, hang on assembled moulding bed successively by being positioned at middle vertical web, fixed to assembling position line, during longitudinal register, reference edge is concordant with bottom edge, and laterally hold out against with middle diaphragm, qualified rear positioning welding is fixed;
2, the separator unit weld seam of interposition is welded: first weld separator unit and base plate weld seam, then weld separator unit and vertical web weld seam, be welded to and stop welding from top 300mm;
3, vertical web weld seam welding: first weld and indulge weld seam between web and base plate, then splicing welding joint between the vertical web of weldering, weld seam between web and middle diaphragm is indulged in finally weldering;
(6), assembled to the separator unit being positioned at side again:
The separator unit being positioned at side is hung on assembled moulding bed successively carry out determining spelling, laterally have the drain slope of 2%, and vertical with bottom board unit, the dividing plate top increment spacing of separator unit is corresponding with the U rib spacing of top plate unit;
(7), assembled to the vertical web unit secondary being positioned at side again:
1, indulge the horizontal stroke of web unit, longitudinal register with the position line marked for benchmark, and be close to vertical web unit, qualified rear positioning welding is fixed;
2, the separator unit weld seam welding of opposite side: first weld separator unit and base plate weld seam, then weld separator unit and vertical web unit weld seam, be welded to and stop welding from top 300mm;
3, the vertical web unit weld seam welding of opposite side: first weld and indulge weld seam between web unit and base plate, then splicing welding joint between the vertical web unit of weldering, weld seam between web unit and dividing plate is indulged in finally weldering;
(8), top plate unit is assembled:
1, top plate unit assembling should meet design laterally 2% horizontal wall inscription and the requirement of longitudinal steel bridge line style, during top plate unit assembling, can make some ballast blocks and assist, contact to make top plate unit and hold out against with diaphragm, web unit;
2, top plate unit weld seam welding: first weld internal weld seams, rear weldering external splice weld seam.When carrying out internal weld seams welding, first welding weld seam between top plate unit and vertical web unit, then welding weld seam between top plate unit and separator unit; During the welding of external splice weld seam, first weld longitudinal spliced weld seam, the horizontally-spliced weld seam of rear weldering, postwelding carries out UT flaw detection on request;
(9) arm unit, is chosen assembled:
Finally carry out choosing arm unit assembled, adopt 2% gradient of transit monitoring half-breadth and transverse direction, qualified rear welding;
(10), steel bridge case beam quality examination
Often take turns after steel bridge box girder integral assembly welding completes and directly on assembled moulding bed, carry out assembled quality examination, the constraint of moulding bed to beam body should be removed before inspection, make case beam be in free state;
The scope of examination comprises: bridge is longitudinally linear; The longitudinal accumulation length of case beam; Distortion; Port match situation between sections;
1, steel bridge overall wire type checking:
Line style detects: the inspection of bridge line style for benchmark, detects the actual elevation value at diaphragm place, each case beam two ends with the theoretical absolute altitude at longitudinal centre line place, checks the side sway of pre-joggle beam section center line while inspection is linear;
The distortion of case beam checks: being the left and right absolute altitude value by checking diaphragm place, each beam section two ends, judging level and the distorting event of each beam section.
2, the matching precision inspection of port between case beam:
Between case beam, port connection should check vertical web unit place deck-molding; Adjacent vertical web unit contraposition deviation; Rib unfitness of butt joint indulged by base plate flat oblique butt joint corner deviation, edges of boards unfitness of butt joint, top board;
3, groove gap inspection:
The gap of steel box girder segment interface must strictly control, and excessive gap can increase welding contracted quantity, and the too small weld seam that easily causes in gap is molten not saturating.Therefore specify that reasonable groove gap is the key factor ensureing steel box-girder quality;
It is 6mm that this bridge gauge determines sections interface gaps minimum value, and its allowable variation scope is 0-4mm, and other key element that sections connects all must be launched with this;
For this reason, take gap positioning process plate when overall package, guarantee gap size, determine several gap anchor points, for clearance inspection at top, base plate place;
If gap is less than setting, then should revise; After correction, check whether the unfitness of butt joint of edges of boards is less than 1mm, finally all data is recorded in check table.
The invention provides a kind of interchange steel bridge and preparation method thereof, compact conformation, splicing accuracy is high, promotes when low strength formwork, improves into bridge line style.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of base plate paving in the present invention;
Fig. 3 is the assembly welding structural representation of base plate I type stiffening rib in the present invention;
Fig. 4 is the structural representation being positioned at interposition separator unit in the present invention;
Fig. 5 is positioned at the structural representation that interposition indulges web unit in the present invention;
Fig. 6 is the structural representation being positioned at side separator unit in the present invention;
Fig. 7 is positioned at the structural representation that side indulges web unit in the present invention;
Fig. 8 is the structural representation of top board assembly welding in the present invention.
Description of reference numerals: 16, horizontally-spliced weld seam; 17, longitudinal spliced weld seam.
Detailed description of the invention
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, a kind of interchange steel bridge, comprise bottom board unit 1, separator unit 2, vertical web unit 3, top plate unit 4 and choose arm unit 5, the top of described bottom board unit 1 is provided with vertical web unit 3, separator unit 2 is provided with in described vertical web unit 3, the top of described separator unit 2 and vertical web unit 3 is provided with top plate unit 4, and a side of described top plate unit 4 is provided with chooses arm unit 5.
Described bottom board unit comprises the base plate 6 in dislocation splicing distribution, and described base plate 6 is provided with base plate I type stiffening rib 7;
Described vertical web unit comprises equally distributed vertical web 8, and the bottom of described vertical web 8 is connected between adjacent bottom plates I type stiffening rib 7;
Described separator unit comprises median septum 9 and side partition 10, median septum 9 and the side partition 10 of uniform intervals distribution is provided with between described vertical web 8, described median septum 9 is interspersed with side partition 10, the median septum 9 of cross direction profiles is in same linearity distribution, the side partition 10 of cross direction profiles is in same linearity distribution, described median septum 9 and the bottom of side partition 10 are respectively equipped with increment 11 bottom the dividing plate of locating with the clamping of base plate I type stiffening rib 7 phase, and described median septum 9 is respectively equipped with dividing plate top increment 12 with the top of side partition 10;
Described top plate unit comprises the top board 13 in dislocation splicing distribution, and the bottom of described top board 13 is provided with the top board fixed end 14 fixed with dividing plate top increment 12, vertical web 8 top;
Described arm unit of choosing comprises and chooses arm plate 15, and described chooses the outer wall that arm plate 15 is located at top plate unit, and the described top of choosing arm plate 15 and the top of top board 13 are that same level line distributes.
A preparation method for interchange steel bridge, carries out according to the following steps:
(1), the laying of support jig:
1, figure is set according to grade separation steel bridge support jig, releases the projection line supporting loose tool and position line on the ground;
Support jig adjacent transverse centre of location line should control in the scope of ± 0.5mm along the spacing deviation of grade separation steel bridge longitudinal direction;
2, arrange moulding bed according to the ground line-transect of support jig, first arrange the base of support jig, for preventing the overall line style of the moving influence grade separation steel bridge of support jig, base and ground adopt studs to be connected and fixed;
3, the base of support jig is arranged also after the assay was approved, then the centre of location line of the horizontal stroke on base, longitudinal beam is migrated to the upper surface of base, then according to centre of location line and the projected boundary line supporting loose tool, longitudinally horizontal stroke, longitudinal beam is located successively along steel bridge, and adjust center line and be welded and fixed after overlapping, the center distance deviation of the adjacent transverse beam after fixing must not be greater than ± 1mm;
4, after the transverse beam of support jig and longitudinal beam have been laid on request, check whether firm, should guarantee can not be moved in assembling of steel bridge process; Then detect, adjust the flatness of moulding bed control panel supporting surface, flatness allowable variation is not more than 5mm;
5, support jig design drawing requirement, transverse beam is released moulding bed control panel position line, and with moulding bed control panel position line for benchmark, set gradually loose tool control panel, control panel takes CNC cutting, must through Precision Machining with bridge base plate contact surface;
Fetal membrane control panel is arranged should meet following requirement: horizontal line is consistent with the bridge lateral gradient, is 2% horizontal wall inscription; Longitudinal line is that steel bridge becomes bridge line style; Fixedly be welded on crossbeam after meeting the requirements;
(4), moulding bed detects:
After the support jig of grade separation steel bridge has been laid, total powerstation is utilized to carry out the detection of each measuring control point coordinate on moulding bed control panel, and record survey data, then surving coordinate Value Data is imported computer, showing that steel bridge moulding bed arranges line style, comparing, when there is deviation with the bridge line style that becomes of designing requirement, local control panel is adjusted, meets until completely the same and be designed to the requirement of bridge line style;
(5), grade separation steel bridge is shaping:
1, bottom board unit is assembled: after support jig is assembled, and the base plate be up to the standards is hung on support jig successively, fixed sample reference line over the ground, and utilizes interim Karma or spot welding to fix after being close to moulding bed control panel, to obtain good one-tenth bridge line style;
2, each base plate marks center line, and be that benchmark marks base plate I type stiffening rib and web cell location line with center line, lay base plate I type stiffening rib successively by reference line position and spot welding is fixed;
3, CO is adopted
2gas shielded arc welding, base plate I type stiffening rib is welded, symmetrical welding from the middle to both ends, be welded to and stop welding from 200mm place, base plate I type stiffening rib termination, after weld seam is cooled to room temperature completely, detect the spacing of base plate I type stiffening rib, with the verticality of base plate, the rate that falls into that separator unit place base plate I type stiffening rib detects model should reach 100%, if the spacing of base plate I type stiffening rib does not meet technical requirements, spot heating mode is adopted to correct, adding heat straightening temperature is 700 DEG C ~ 800 DEG C, and maximum heating temperature must not more than 900 DEG C;
4, the splicing of bottom board unit adopts CO
2gas shielded arc welding or CO
2gas shielded arc welding bottoming, Lincoln weld filling and capping;
Base plate splicing welding sequence is: the longitudinal weld longitudinal seam first welding base plate splicing, then welds horizontally-spliced weldering, the spacing of postwelding repetition measurement base plate I type stiffening rib, ensures that the rate that falls into detecting model reaches 100%;
(4), first assembled to the separator unit of interposition:
1, the separator unit of steel bridge case beam has steel flanged beam and open web type two kinds, and wherein median septum is open web type, and side partition is steel flanged beam;
Be positioned at middle separator unit to divide because beam section manufactures section, break it into two, before assembled, utilize interim code plate that separator unit is linked to be entirety as requested;
2, separator unit is hung on assembled moulding bed, determine to fix positioning welding after assembling position line, separator unit should be adjacent to assembling with bottom board unit;
For ensureing the stability of location rear bulkhead unit and the verticality with bottom board unit, behind location, temporary support need be added in separator unit both sides;
(5), first once assembled to the vertical web of interposition:
1, hang on assembled moulding bed successively by being positioned at middle vertical web, fixed to assembling position line, during longitudinal register, reference edge is concordant with bottom edge, and laterally hold out against with middle diaphragm, qualified rear positioning welding is fixed;
2, the separator unit weld seam of interposition is welded: first weld separator unit and base plate weld seam, then weld separator unit and vertical web weld seam, be welded to and stop welding from top 300mm;
3, vertical web weld seam welding: first weld and indulge weld seam between web and base plate, then splicing welding joint between the vertical web of weldering, weld seam between web and middle diaphragm is indulged in finally weldering;
(6), assembled to the separator unit being positioned at side again:
The separator unit being positioned at side is hung on assembled moulding bed successively carry out determining spelling, laterally have the drain slope of 2%, and vertical with bottom board unit, the dividing plate top increment spacing of separator unit is corresponding with the U rib spacing of top plate unit;
(7), assembled to the vertical web unit secondary being positioned at side again:
1, indulge the horizontal stroke of web unit, longitudinal register with the position line marked for benchmark, and be close to vertical web unit, qualified rear positioning welding is fixed;
2, the separator unit weld seam welding of opposite side: first weld separator unit and base plate weld seam, then weld separator unit and vertical web unit weld seam, be welded to and stop welding from top 300mm;
3, the vertical web unit weld seam welding of opposite side: first weld and indulge weld seam between web unit and base plate, then splicing welding joint between the vertical web unit of weldering, weld seam between web unit and dividing plate is indulged in finally weldering;
(8), top plate unit is assembled:
1, top plate unit assembling should meet design laterally 2% horizontal wall inscription and the requirement of longitudinal steel bridge line style, during top plate unit assembling, can make some ballast blocks and assist, contact to make top plate unit and hold out against with diaphragm, web unit;
2, top plate unit weld seam welding: first weld internal weld seams, rear weldering external splice weld seam.When carrying out internal weld seams welding, first welding weld seam between top plate unit and vertical web unit, then welding weld seam between top plate unit and separator unit; During the welding of external splice weld seam, first weld longitudinal spliced weld seam, the horizontally-spliced weld seam of rear weldering, postwelding carries out UT flaw detection on request;
(9) arm unit, is chosen assembled:
Finally carry out choosing arm unit assembled, adopt 2% gradient of transit monitoring half-breadth and transverse direction, qualified rear welding;
(10), steel bridge case beam quality examination:
Often take turns after steel bridge box girder integral assembly welding completes and directly on assembled moulding bed, carry out assembled quality examination, the constraint of moulding bed to beam body should be removed before inspection, make case beam be in free state;
The scope of examination comprises: bridge is longitudinally linear; The longitudinal accumulation length of case beam; Distortion; Port match situation between sections;
1, steel bridge overall wire type checking:
Line style detects: the inspection of bridge line style for benchmark, detects the actual elevation value at diaphragm place, each case beam two ends with the theoretical absolute altitude at longitudinal centre line place, checks the side sway of pre-joggle beam section center line while inspection is linear;
The distortion of case beam checks: being the left and right absolute altitude value by checking diaphragm place, each beam section two ends, judging level and the distorting event of each beam section.
2, the matching precision inspection of port between case beam:
Between case beam, port connection should check vertical web unit place deck-molding; Adjacent vertical web unit contraposition deviation; Rib unfitness of butt joint indulged by base plate flat oblique butt joint corner deviation, edges of boards unfitness of butt joint, top board;
3, groove gap inspection:
The gap of steel box girder segment interface must strictly control, and excessive gap can increase welding contracted quantity, and the too small weld seam that easily causes in gap is molten not saturating.Therefore specify that reasonable groove gap is the key factor ensureing steel box-girder quality;
It is 6mm that this bridge gauge determines sections interface gaps minimum value, and its allowable variation scope is 0-4mm, and other key element that sections connects all must be launched with this;
For this reason, take gap positioning process plate when overall package, guarantee gap size, determine several gap anchor points, for clearance inspection at top, base plate place;
If gap is less than setting, then should revise; After correction, check whether the unfitness of butt joint of edges of boards is less than 1mm, finally all data is recorded in check table.
Claims (3)
1. an interchange steel bridge, it is characterized in that: comprise bottom board unit (1), separator unit (2), vertical web unit (3), top plate unit (4) and choose arm unit (5), the top of described bottom board unit (1) is provided with vertical web unit (3), separator unit (2) is provided with in described vertical web unit (3), described separator unit (2) and the top of vertical web unit (3) are provided with top plate unit (4), and a side of described top plate unit (4) is provided with chooses arm unit (5).
2. a kind of interchange steel bridge according to claim 1, is characterized in that: described bottom board unit comprises the base plate (6) in dislocation splicing distribution, and described base plate (6) is provided with base plate I type stiffening rib (7);
Described vertical web unit comprises equally distributed vertical web (8), and the bottom of described vertical web (8) is connected between adjacent bottom plates I type stiffening rib (7);
Described separator unit comprises median septum (9) and side partition (10), median septum (9) and the side partition (10) of uniform intervals distribution is provided with between described vertical web (8), described median septum (9) and side partition (10) are interspersed, the median septum (9) of cross direction profiles distributes in same linearity, the side partition (10) of cross direction profiles distributes in same linearity, described median septum (9) and the bottom of side partition (10) are respectively equipped with increment (11) bottom the dividing plate of locating with stiffening rib (7) the phase clamping of base plate I type, described median septum (9) is respectively equipped with dividing plate top increment (12) with the top of side partition (10),
Described top plate unit comprises the top board (13) in dislocation splicing distribution, and the bottom of described top board (13) is provided with the top board fixed end (14) fixed with dividing plate top increment (12), vertical web (8) top;
Described arm unit of choosing comprises and chooses arm plate (15), and described chooses the outer wall that arm plate (15) is located at top plate unit, and the described top of choosing arm plate (15) and the top of top board (13) are that same level line distributes.
3. the preparation method of a kind of interchange steel bridge according to claim 1 and 2, is characterized in that carrying out according to the following steps:
(1), the laying of support jig:
1, figure is set according to grade separation steel bridge support jig, releases the projection line supporting loose tool and position line on the ground;
Support jig adjacent transverse centre of location line should control in the scope of ± 0.5mm along the spacing deviation of grade separation steel bridge longitudinal direction;
2, arrange moulding bed according to the ground line-transect of support jig, first arrange the base of support jig, for preventing the overall line style of the moving influence grade separation steel bridge of support jig, base and ground adopt studs to be connected and fixed;
3, the base of support jig is arranged also after the assay was approved, then the centre of location line of the horizontal stroke on base, longitudinal beam is migrated to the upper surface of base, then according to centre of location line and the projected boundary line supporting loose tool, longitudinally horizontal stroke, longitudinal beam is located successively along steel bridge, and adjust center line and be welded and fixed after overlapping, the center distance deviation of the adjacent transverse beam after fixing must not be greater than ± 1mm;
4, after the transverse beam of support jig and longitudinal beam have been laid on request, check whether firm, should guarantee can not be moved in assembling of steel bridge process; Then detect, adjust the flatness of moulding bed control panel supporting surface, flatness allowable variation is not more than 5mm;
5, support jig design drawing requirement, transverse beam is released moulding bed control panel position line, and with moulding bed control panel position line for benchmark, set gradually loose tool control panel, control panel takes CNC cutting, must through Precision Machining with bridge base plate contact surface;
Fetal membrane control panel is arranged should meet following requirement: horizontal line is consistent with the bridge lateral gradient, is 2% horizontal wall inscription; Longitudinal line is that steel bridge becomes bridge line style; Fixedly be welded on crossbeam after meeting the requirements;
(2), moulding bed detects:
After the support jig of grade separation steel bridge has been laid, total powerstation is utilized to carry out the detection of each measuring control point coordinate on moulding bed control panel, and record survey data, then surving coordinate Value Data is imported computer, showing that steel bridge moulding bed arranges line style, comparing, when there is deviation with the bridge line style that becomes of designing requirement, local control panel is adjusted, meets until completely the same and be designed to the requirement of bridge line style;
(3), grade separation steel bridge is shaping:
1, bottom board unit is assembled: after support jig is assembled, and the base plate be up to the standards is hung on support jig successively, fixed sample reference line over the ground, and utilizes interim Karma or spot welding to fix after being close to moulding bed control panel, to obtain good one-tenth bridge line style;
2, each base plate marks center line, and be that benchmark marks base plate I type stiffening rib and web cell location line with center line, lay base plate I type stiffening rib successively by reference line position and spot welding is fixed;
3, CO is adopted
2gas shielded arc welding, base plate I type stiffening rib is welded, symmetrical welding from the middle to both ends, be welded to and stop welding from 200mm place, base plate I type stiffening rib termination, after weld seam is cooled to room temperature completely, detect the spacing of base plate I type stiffening rib, with the verticality of base plate, the rate that falls into that separator unit place base plate I type stiffening rib detects model should reach 100%, if the spacing of base plate I type stiffening rib does not meet technical requirements, spot heating mode is adopted to correct, adding heat straightening temperature is 700 DEG C ~ 800 DEG C, and maximum heating temperature must not more than 900 DEG C;
4, the splicing of bottom board unit adopts CO
2gas shielded arc welding or CO
2gas shielded arc welding bottoming, Lincoln weld filling and capping;
Base plate splicing welding sequence is: the longitudinal weld longitudinal seam first welding base plate splicing, then welds horizontally-spliced weldering, the spacing of postwelding repetition measurement base plate I type stiffening rib, ensures that the rate that falls into detecting model reaches 100%;
(4), first assembled to the separator unit of interposition:
1, the separator unit of steel bridge case beam has steel flanged beam and open web type two kinds, and wherein median septum is open web type, and side partition is steel flanged beam;
Be positioned at middle separator unit to divide because beam section manufactures section, break it into two, before assembled, utilize interim code plate that separator unit is linked to be entirety as requested;
2, separator unit is hung on assembled moulding bed, determine to fix positioning welding after assembling position line, separator unit should be adjacent to assembling with bottom board unit;
For ensureing the stability of location rear bulkhead unit and the verticality with bottom board unit, behind location, temporary support need be added in separator unit both sides;
(5), first once assembled to the vertical web of interposition:
1, hang on assembled moulding bed successively by being positioned at middle vertical web, fixed to assembling position line, during longitudinal register, reference edge is concordant with bottom edge, and laterally hold out against with middle diaphragm, qualified rear positioning welding is fixed;
2, the separator unit weld seam of interposition is welded: first weld separator unit and base plate weld seam, then weld separator unit and vertical web weld seam, be welded to and stop welding from top 300mm;
3, vertical web weld seam welding: first weld and indulge weld seam between web and base plate, then splicing welding joint between the vertical web of weldering, weld seam between web and middle diaphragm is indulged in finally weldering;
(6), assembled to the separator unit being positioned at side again:
The separator unit being positioned at side is hung on assembled moulding bed successively carry out determining spelling, laterally have the drain slope of 2%, and vertical with bottom board unit, the dividing plate top increment spacing of separator unit is corresponding with the U rib spacing of top plate unit;
(7), assembled to the vertical web unit secondary being positioned at side again:
1, indulge the horizontal stroke of web unit, longitudinal register with the position line marked for benchmark, and be close to vertical web unit, qualified rear positioning welding is fixed;
2, the separator unit weld seam welding of opposite side: first weld separator unit and base plate weld seam, then weld separator unit and vertical web unit weld seam, be welded to and stop welding from top 300mm;
3, the vertical web unit weld seam welding of opposite side: first weld and indulge weld seam between web unit and base plate, then splicing welding joint between the vertical web unit of weldering, weld seam between web unit and dividing plate is indulged in finally weldering;
(8), top plate unit is assembled:
1, top plate unit assembling should meet design laterally 2% horizontal wall inscription and the requirement of longitudinal steel bridge line style, during top plate unit assembling, can make some ballast blocks and assist, contact to make top plate unit and hold out against with diaphragm, web unit;
2, top plate unit weld seam welding: first weld internal weld seams, rear weldering external splice weld seam.When carrying out internal weld seams welding, first welding weld seam between top plate unit and vertical web unit, then welding weld seam between top plate unit and separator unit; During the welding of external splice weld seam, first weld longitudinal spliced weld seam, the horizontally-spliced weld seam of rear weldering, postwelding carries out UT flaw detection on request;
(9) arm unit, is chosen assembled:
Finally carry out choosing arm unit assembled, adopt 2% gradient of transit monitoring half-breadth and transverse direction, qualified rear welding;
(10), steel bridge case beam quality examination:
Often take turns after steel bridge box girder integral assembly welding completes and directly on assembled moulding bed, carry out assembled quality examination, the constraint of moulding bed to beam body should be removed before inspection, make case beam be in free state;
The scope of examination comprises: bridge is longitudinally linear; The longitudinal accumulation length of case beam; Distortion; Port match situation between sections;
1, steel bridge overall wire type checking:
Line style detects: the inspection of bridge line style for benchmark, detects the actual elevation value at diaphragm place, each case beam two ends with the theoretical absolute altitude at longitudinal centre line place, checks the side sway of pre-joggle beam section center line while inspection is linear;
The distortion of case beam checks: being the left and right absolute altitude value by checking diaphragm place, each beam section two ends, judging level and the distorting event of each beam section.
2, the matching precision inspection of port between case beam:
Between case beam, port connection should check vertical web unit place deck-molding; Adjacent vertical web unit contraposition deviation; Rib unfitness of butt joint indulged by base plate flat oblique butt joint corner deviation, edges of boards unfitness of butt joint, top board;
3, groove gap inspection:
The gap of steel box girder segment interface must strictly control, and excessive gap can increase welding contracted quantity, and the too small weld seam that easily causes in gap is molten not saturating.Therefore specify that reasonable groove gap is the key factor ensureing steel box-girder quality;
It is 6mm that this bridge gauge determines sections interface gaps minimum value, and its allowable variation scope is 0-4mm, and other key element that sections connects all must be launched with this;
For this reason, take gap positioning process plate when overall package, guarantee gap size, determine several gap anchor points, for clearance inspection at top, base plate place;
If gap is less than setting, then should revise; After correction, check whether the unfitness of butt joint of edges of boards is less than 1mm, finally all data is recorded in check table.
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| CN107059626A (en) * | 2016-12-22 | 2017-08-18 | 浙江大学 | A kind of rapid constructing method of the horizontal piecemeal longitudinal divisionses of overhead road of city steel box girder bridge |
| CN108842625A (en) * | 2018-06-28 | 2018-11-20 | 武船重型工程股份有限公司 | A kind of girder steel ballast and its installation method |
| CN109208486A (en) * | 2018-10-19 | 2019-01-15 | 江苏京沪重工有限公司 | Joining section manufacturing process between a kind of Steel Bridge top plate |
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| CN107059626A (en) * | 2016-12-22 | 2017-08-18 | 浙江大学 | A kind of rapid constructing method of the horizontal piecemeal longitudinal divisionses of overhead road of city steel box girder bridge |
| CN107059626B (en) * | 2016-12-22 | 2019-12-31 | 浙江大学 | Rapid construction method for transverse block longitudinal segmentation of urban elevated steel box girder bridge |
| CN108842625A (en) * | 2018-06-28 | 2018-11-20 | 武船重型工程股份有限公司 | A kind of girder steel ballast and its installation method |
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| CN109208486A (en) * | 2018-10-19 | 2019-01-15 | 江苏京沪重工有限公司 | Joining section manufacturing process between a kind of Steel Bridge top plate |
| CN110541349A (en) * | 2019-09-06 | 2019-12-06 | 中国五冶集团有限公司 | Space curved surface special-shaped steel box girder bridge section and accurate welding processing forming method thereof |
| CN110842384A (en) * | 2019-11-13 | 2020-02-28 | 重庆交通建设(集团)有限责任公司 | On-site connection process of steel box girder |
| CN112252187A (en) * | 2020-09-02 | 2021-01-22 | 中铁五局集团第四工程有限责任公司 | In-situ scattered assembling and hoisting method for steel box girder |
| CN112609574A (en) * | 2020-11-16 | 2021-04-06 | 中冶(上海)钢结构科技有限公司 | Construction method for temporarily fixing complex steel box girder with through-length stiffening rib at high altitude |
| CN112496590A (en) * | 2020-12-31 | 2021-03-16 | 江苏京沪重工有限公司 | Cantilever type steel box girder manufacturing process |
| CN113565259A (en) * | 2021-08-18 | 2021-10-29 | 江苏京沪重工有限公司 | Machining process for cantilever section of steel box girder of arc cantilever landscape platform |
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| CN115162182B (en) * | 2022-07-20 | 2023-09-15 | 中国五冶集团有限公司 | Cantilever type steel box girder high-precision cable hoisting construction method |
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