CN110847062A - Construction method for whole-hole assembly double-width erection in 80-meter-span wide steel box girder factory - Google Patents
Construction method for whole-hole assembly double-width erection in 80-meter-span wide steel box girder factory Download PDFInfo
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- CN110847062A CN110847062A CN201911182361.1A CN201911182361A CN110847062A CN 110847062 A CN110847062 A CN 110847062A CN 201911182361 A CN201911182361 A CN 201911182361A CN 110847062 A CN110847062 A CN 110847062A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
A construction method for whole-hole splicing double-width erection in a 80-meter-span wide steel box girder factory comprises the following steps: firstly, processing a bottom plate unit (2), a partition plate unit (3), an inclined web T-beam unit (4) and a cantilever arm unit (5) by using a BIM technology; step two, arranging a steel box girder general assembly jig frame (1) in a girder factory general assembly area; step three, processing a bottom plate unit (2), a clapboard unit (3), an inclined web T-beam unit (4) and a cantilever arm unit (5); assembling the components; step four, checking and accepting after the 80m steel box girder (6) is totally spliced; fifthly, transporting the steel box girder (6) by a combined module girder transporting vehicle (7); step six, feeding beams; step seven, beam falling; and step eight, erecting the whole hole steel box girder left and right. The method can be suitable for inland areas and coastal areas, reduces the field workload, reduces the labor input under the current large environment with higher labor cost, and saves the cost.
Description
Technical Field
The invention relates to the application field of construction technology of a large-span steel box girder bridge, in particular to a construction method for whole-hole assembly double-width erection in a 80-meter-span wide-width steel box girder factory.
Background
The steel box girder structure has the characteristics of large span, light weight, long service life, large torsional rigidity of a box section, small section height and good integrity, so that the steel box girder structure is widely applied to the design and construction of roads and municipal bridges and becomes the first choice of a large-span main girder form. At present, the construction method of the large-span steel-concrete composite beam mainly comprises a segment prefabricating installation method and a pushing method. A plurality of large-span large-tonnage whole-hole prefabricated bridges are only suitable for bridges with shipping conditions, and the maximum whole-hole hoisting span in China is 60 meters at present. The jacking method requires that the dead weight of the steel girder is basically borne by the steel beam, and the jacking platform and jacking construction cost are high, and the economical efficiency is poor.
At present, the maximum span steel beam hoisted by a bridge crane in China reaches 60 meters, and for example, a Chinese patent '60-meter steel box beam integral erection construction method' (application number 201210261297.8) discloses that a 60-meter steel box beam is prefabricated into a plurality of manufacturing sections in a factory, and the whole beam is assembled at a bridge position. And (2) independently erecting a plurality of narrow box girders by using a rail type bridge girder erection machine, wherein the weight of each single girder is 230 tons, and temporary buttress construction is needed in a site construction span to meet the requirement of large-span erection. The mode has more beam sections, long construction period of on-site assembling and splicing of bridge positions, great difficulty in controlling safety quality and low work efficiency.
Most inland areas in China do not have navigation conditions and the possibility of hoisting heavy beam bodies by shipping, and the construction technology of the whole-hole prefabricated bridge of the 80-meter steel-concrete composite beam is not precedent before China. At present, domestic and foreign bridge erecting equipment mainly aims at concrete beams, particularly heavy bridge erecting equipment, needs to be combined with heavy hoisting equipment or side beam transporting and lifting equipment, is small in application range, limited in transportation conditions and high in bridge erecting requirement, and has more limitation conditions compared with the traditional beam transporting and bridge erecting technology.
Disclosure of Invention
In order to solve the problems existing in the traditional method for erecting the steel box girder by pushing and hoisting by a large crane in sections, the invention provides a whole-hole splicing double-width erection construction method in a 80-meter-span wide steel box girder factory. The invention can be suitable for inland areas and coastal areas, reduces the field workload, reduces the manpower input under the current large environment with higher labor cost, saves the cost, and simultaneously converts more bridge constructions into mechanical equipment operated by professional personnel with more reliable quality, lower cost, more advanced technology and higher precision.
In order to realize the purpose, the invention provides a construction method for whole-hole splicing double-width erection in a 80-meter-span wide steel box girder factory, which comprises the following steps:
processing a bottom plate unit, a partition plate unit, an inclined web plate T beam unit and a cantilever arm unit in a steel structure processing plant by using a BIM technology;
step two, arranging a steel box girder main assembly jig frame in a girder factory main assembly area;
step three, machining a base plate unit, a partition plate unit, an inclined web plate T-beam unit and a cantilever arm unit on the steel structure plate unit; sequentially transporting each component to a main assembly area of a beam factory through a transport vehicle for assembly;
step four, checking and accepting after the total assembly of the 80-meter steel box girder is completed;
fifthly, transporting the steel box girder by a combined module girder transporting vehicle;
sixthly, positioning and anchoring supporting legs after the large truss type bridge girder erection machine occupies space, and feeding the girder through the matching of the combined type module girder transporting vehicle and the crown block;
step seven, beam falling;
and step eight, the front crown block and the rear crown block are matched with each other to lift and finish the erection of the left and right frames of the whole-hole steel box girder.
Preferably, in the second step, the single set of total assembly jig frame is formed by assembling and welding 200 × 200 section steel, 80 × 80 square steel and 90 × 90 angle steel; the length of a single-set jig frame is 81 meters, the width of the single-set jig frame is 9.3 meters, 4 gantry cranes with 10t assembled steel box beams are put into the single-set jig frame, welding equipment, pipeline gas and protective measures are arranged in a matched mode, an equal-size concrete foundation is arranged below the total assembled jig frame, the concrete foundation has enough strength and cannot break, and the whole foundation is subjected to pressure bearing.
In any scheme, preferably, in the third step, the bottom plate unit, the partition plate unit, the inclined web plate T-shaped beam unit and the cantilever arm unit are sequentially assembled and welded on the total assembly jig frame, and transverse splicing welding seams of the bottom plate, the web plate and the top plate of the box beam are welded in a staggered mode by 200 mm; the partition plate, the bottom plate and the web plate are welded by carbon dioxide gas protection; the inner sides of the web plate and the bottom plate are welded under the protection of carbon dioxide gas, the outer sides of the web plate and the bottom plate are gouged back by a gouging machine, and the cover surface is filled by an automatic welding trolley.
In any of the above schemes, preferably, in the fourth step, after the steel box girder is assembled, anticorrosion construction is performed, and anticorrosion treatment is performed on the steel box girder by combining the design drawing requirements and the current specifications; and (4) performing various acceptance according to design and specification requirements, and installing a permanent support in the beam factory after acceptance is qualified.
Preferably, in any of the above schemes, in the fifth step, the combined type module transport vehicle is provided with the camel beam, a 450T girder lifting machine is adopted to install the steel box girder on the combined type module transport vehicle, the control room controls the girder to transport, and in order to ensure the correct track, the girder transport needs to draw a boundary line; and (4) transporting the beam to a beam feeding area by adopting a cross-double-width transportation mode, and arranging special persons on two sides of the beam transporting vehicle to monitor the operation of the beam transporting vehicle.
In any of the above schemes, preferably, in the sixth step, the total length of the truss type bridge girder erection machine is 170 meters, and the truss type bridge girder erection machine is in a walking self-cantilever via mode; the middle supporting leg and the front supporting leg of the truss type bridge girder erection machine are supported on the main bearing point of the main girder; and the middle supporting leg is anchored with the bridge floor through finish rolling deformed steel bars.
In any of the above schemes, preferably, in the sixth step, the concrete beam feeding step is:
(1) the front beam transporting vehicle reaches the rear position of the middle supporting leg, the front overhead traveling crane sends down a lifting appliance to be connected with the upper lifting point of the steel box girder, and the front overhead traveling crane and the rear beam transporting vehicle synchronously move forwards;
(2) the rear girder transporting vehicle reaches the tail part of the front girder transporting vehicle, the rear overhead traveling crane moves above the lifting point of the steel box girder, and the lower lifting appliance is connected with the upper lifting point of the steel box girder;
(3) the rear crown block is lifted to lift the rear end of the steel box girder away from the combined type module girder transporting vehicle, so that the steel box girder is in a suspended horizontal state.
In any of the above schemes, preferably, in the seventh step, the concrete beam falling step is:
(1) the front and rear crane lifting beams move longitudinally forward to the position above the beam falling position;
(2) the front and rear crown blocks simultaneously fall down to enable the lower bottom surface of the steel box girder to reach the position 500mm above the high side cushion stone and stop;
(3) the front and rear overhead traveling cranes drive the lifting system to transversely move to the beam falling position through the transverse moving motor;
(4) and the lifting system falls down to enable the steel box girder to fall onto the pad stone, and the steel girder erection is completed.
The invention is obtained according to years of practical application practice and experience, adopts the best technical means and measures to carry out combined optimization, obtains the optimal technical effect, is not simple superposition and splicing of technical characteristics, and has obvious significance.
The invention has the beneficial effects that:
1. the plate unit piece is subjected to finish machining in a processing plant and is subjected to factory operation, the standardization degree is high, the processing precision is high, the mechanical utilization rate of personnel is high, the environmental pollution is small, and the plate unit piece more meets the technical requirement of green construction.
And 2, the BIM technology is applied to the prefabrication construction of the 80-meter rigid-concrete composite beam, so that accurate data support is provided for the prefabrication of the steel beam, and the digitization level is higher.
The 3.80 m steel beam is prefabricated in a whole hole, the quality is easy to guarantee, the weight of the steel beam is small relative to that of a concrete beam, and the whole hole of the steel beam is transported to a bridge position in a beam transporting mode, so that the method is suitable for bridges without shipping conditions.
4. The steel box girders are spliced on the main splicing jig frame of a girder factory, the whole 80-meter hole steel box girders are erected, the steel box girders do not need to be segmented like the conventional process, temporary piers are arranged on site, and then the process of hoisting and splicing is adopted, so that the erection efficiency can be improved.
5. The original ground surface bearing capacity of most large-span bridge sites is poor or no transportation condition exists, large-tonnage vehicle transportation cannot be met, and the traditional supports are erected to carry out segment hoisting and have high requirements on the transportation condition. The mode of transporting the beam on the beam has no requirement on the bearing capacity of the bridge position, and the transportation problem is solved.
6. The conventional large-span steel box girder sectional hoisting process has overlarge welding or bolting workload, long field operation time and many potential safety hazards. The whole hole is assembled in the factory, so that the construction progress can be effectively accelerated, and the safety risk is reduced.
7. The truss type bridge girder erection machine adopts a walking type walking self-passing hole-passing mode, does not need to bundle a beam and additionally arrange a balance weight, and saves the time for passing holes and erecting the beam.
8. The steel beam of the long-span steel-concrete composite beam weighs 510 tons, and the truss type bridge girder erection machine can greatly reduce the weight of long-span bridge girder erection equipment and has strong wind load resistance.
The double-width steel box girder with the span of 9.80 meters can be erected in place at one time, so that the construction efficiency is effectively improved, and the construction safety is improved.
10. The bridge girder erection machine solves the problems that due to the fact that the radius of a curve is small, traditional pushing construction of a single girder is difficult to control, and precision is difficult to control.
11. The method solves the difficult problem of whole-hole prefabrication and erection construction of the long-span steel box girder, provides a construction method of a large-span steel girder project which is more suitable for crossing rivers, roads and bridge sites and is unsuitable for the passage of construction vehicles, and improves the bridge construction technology.
12. The erection process implemented by the invention has the advantages that the large-span steel box girder is spliced in a whole hole, and the steel girder can be transported to the bridge site in a whole hole mode by transporting the girder on a double-width girder. The problem of whole-hole erection with the span of 80 meters is solved, and a new mode is opened up for the rapid erection of bridges in inland areas.
Brief description of the drawings
FIG. 1 is a flow chart of the construction process of the whole-hole splicing erection of an 80m steel box girder;
FIG. 2-1 is a schematic view of the general jig assembly set up of the beam factory according to the present invention;
FIG. 2-2 is a schematic plan view of the whole hole steel beam assembly jig frame of the beam factory according to the present invention;
FIG. 3 is a schematic view of the assembly of the floor units of the present invention;
FIG. 4 is a schematic view of the assembly of the partition units in the present invention;
FIG. 5 is a schematic view of the installation of the diagonal web elements of the present invention;
FIG. 6 is a schematic view of the arm picking unit installation of the present invention;
FIG. 7 is a cross-sectional view of a steel beam of the present invention;
FIG. 8 is a schematic plan view of an 80-meter steel box girder according to the present invention;
FIG. 9 is a schematic view of a modular vehicle transport beam of the present invention;
FIG. 10 is a schematic view of a span double bar in the present invention;
FIG. 11 is a schematic view of a feed beam of the present invention;
FIG. 12 is a schematic illustration of a drop beam in the present invention;
FIG. 13 is a schematic cross-sectional view of a double-deck erection of a bridge girder erection machine according to the present invention;
wherein, 1, assembling the moulding bed; 2. a floor unit; 3. a separator unit; 4. a diagonal web T-beam unit; 5. a cantilever unit; 6. a steel box girder; 7. a combined module girder transporting vehicle; 8. a bow beam; 9. a truss type bridge girder erection machine; 9-1. middle support leg; 9-2. front supporting legs; 9-3, front crown block; 9-4. rear crown block.
Detailed Description
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings and the detailed embodiments of the present application, but the following embodiments are only intended to understand the present invention, and the embodiments and features of the embodiments in the present application can be combined with each other, and the present application can be implemented in many different ways as defined and covered by the claims.
The engineering of a certain national road is a bidirectional six-lane, wherein the full bridge of the main control engineering yellow river super bridge is divided into 11 links, the north approach bridge is a T beam with the length of 30 meters, the bridge across the protection embankment is a steel-concrete composite beam with the length of 50+80+50 meters, the north approach bridge in the embankment is a corrugated steel web beam with the length of 50 meters, the main bridge is a steel-concrete composite beam with the length of 80 meters, the south approach bridge is a corrugated steel web beam with the length of 50 meters, and the minimum curve radius is 1400 meters. The main bridge has 19 holes, the span of a single hole is 80 meters, the upper structure is a steel-concrete composite beam, and the left and right broad width steel box beams are respectively arranged.
According to the actual situation and the requirement of the construction period, the following problems are mainly solved in the construction:
the bridge pier positions are all located in the yellow river beach land, the original surface bearing capacity is poor, and large-tonnage vehicle transportation cannot meet the requirement. Traditional setting up the support, carrying out the segment and assembling, because of being in river course flood discharge scope, need the multiple spot to pile the pile foundation and in order to satisfy and bear the weight of the requirement, be difficult to the construction.
The curve radius is less, and R is 1400 meters for, and the traditional top of monolithic roof beam pushes away the construction degree of difficulty greatly, and the precision is difficult to control.
The single steel box girder is 80 meters long and 510T in weight, and the first domestic case is erected in the whole hole.
FIG. 1 is a process flow for the practice of the present invention:
firstly, processing a bottom plate unit 2, a partition plate unit 3, an inclined web plate T beam unit 4 and a cantilever arm unit 5 in a steel structure processing plant by using a BIM technology;
step two, arranging a steel box girder general assembly jig frame 1 in a girder factory general assembly area;
step three, machining a base bottom plate unit 2, a partition plate unit 3, an inclined web plate T beam unit 4 and a cantilever arm unit 5 on the steel structure plate unit; sequentially transporting each component to a main assembly area of a beam factory through a transport vehicle for assembly; and 2 gantry cranes are adopted to assemble the steel box girder 6 into a whole span hole hoisting girder section with the length of 80m, and the trimming amount is reserved on the large pier side of each hole of the steel box girder 6 during the assembly of the installation section of the steel box girder 6, so that the steel box girder 6 is ensured to be accurately butted with a second hole after being installed.
The assembly sequence is as follows:
the floor units 2 are spliced transversely and longitudinally as shown in fig. 3.
And the second butt welding of the bottom plate unit adopts a single-side welding and double-side forming process, the back side is pasted with a ceramic liner, and the front side is subjected to carbon dioxide arc welding bottoming and automatic submerged arc welding filling cover surface. The splicing mode of the bottom plate units is as follows: and the bottom plate unit is positioned on the general assembly jig frame according to a bridge line, and longitudinal joints are welded.
The separator 3 is assembled as shown in fig. 4.
And after the longitudinal welding seam of the bottom plate is welded, assembling the partition plate unit 3. The bottom of the clapboard unit and the bottom plate 2 adopt positioning welding. The bottom of the inclined support is connected with the permanent magnet jack and is adsorbed on the bottom plate, the top of the inclined support is supported on the upper wing plate of the partition plate, and each partition plate supports 4 inclined supports to vertically fix the partition plate. The baffle supports and adopts no sign indicating number fixed, avoids damaging the base metal.
The oblique web T-beam 4 is assembled as in fig. 5.
The oblique web plate T beam 4 is assembled and supported by using a general assembly jig frame, the T beam and the web plate are tightly sealed with the partition plate by using a jack, a permanent magnet jack and a chain block, and the web plate T beam is fixed with the bottom plate 2 and the partition plate 3 by adopting tack welding. And after the fixation is finished, detaching the clapboard diagonal brace, the jack and the chain block.
The cantilever 5 is mounted as shown in fig. 6.
Marking out lines according to the designed cross slope, positioning the cantilever arm unit, and welding.
The box girder 6 welding requirement is as follows:
(1) transverse splicing welding seams of the bottom plate, the web plate and the top plate of the box girder are welded in a staggered manner by 200 mm;
(2) the partition plate, the bottom plate and the web plate are welded by carbon dioxide gas protection.
(3) The inner sides of the web plate and the bottom plate are welded under the protection of carbon dioxide gas, the outer sides of the web plate and the bottom plate are gouged back by a gouging machine, and the cover surface is filled by an automatic welding trolley.
Step four, checking and accepting after finishing the total assembly of the 80-meter steel box girder 6;
fifthly, transporting the steel box girder 6 by a combined module girder transporting vehicle 7; as shown in fig. 9 and 10.
Sixthly, positioning and anchoring the occupied rear supporting legs of the large truss type bridge girder erection machine 9, and feeding the girder through the matching of the combined type module girder transport vehicle 7 and the crown block, as shown in fig. 11;
step seven, beam falling is carried out, as shown in figure 12;
and step eight, the front crown block and the rear crown block are matched with each other to lift and finish the erection of the left and right frames of the whole-hole steel box girder, which is shown in figure 13.
In the second step, the single-set total assembly jig frame 1 is formed by assembling and welding 200 × 200 section steel, 80 × 80 square steel and 90 × 90 angle steel; the length of a single-set jig frame is 81 meters, the width of the single-set jig frame is 9.3 meters, 4 gantry cranes with 10t assembled steel box beams are put into the single-set jig frame, welding equipment, pipeline gas and protective measures are arranged in a matched mode, equal-size concrete foundations are arranged below the total assembled jig frame 1, the concrete foundations have enough strength and cannot break, and the whole foundation is subjected to pressure bearing.
In the fourth step, after the steel box girder 6 is assembled, anticorrosion construction is carried out, and anticorrosion treatment is carried out on the steel box girder 6 by combining the design drawing requirements and the current protective coating for highway steel bridges (JT/T722-2008); and (4) performing various acceptance according to design and specification requirements, and installing a permanent support in the beam factory after acceptance is qualified.
In the fifth step, the camel beam 8 is installed on the combined type module transport vehicle 7, the steel box girder 6 is installed on the combined type module transport vehicle 7 by adopting a 450T girder lifting machine, the girder transport is controlled by a control room, and a boundary line needs to be drawn for transporting the girder to ensure the correct track; and (4) transporting the beam to a beam feeding area by adopting a cross-double-width transportation mode, and arranging special persons on two sides of the beam transporting vehicle to monitor the operation of the beam transporting vehicle.
In the sixth step, the total length of the truss type bridge girder erection machine 9 is 170 meters, and the walking type walking self-propelled cantilever hole passing mode is adopted; the middle supporting leg 9-1 and the front supporting leg 9-1 of the truss type bridge girder erection machine 9 are supported on the main bearing point of the main girder; the middle support leg 9-1 is anchored with the bridge deck through finish rolling deformed steel bars; the front and middle support legs are locked with the main beam, and the cross beams of the front and middle support legs are leveled.
In the sixth step, the concrete beam feeding step is as follows:
(1) the front beam transporting vehicle reaches the rear position of the middle supporting leg 9-1, a front crown block 9-3 issues a lifting appliance to be connected with a lifting point on the steel box girder 6, and the front crown block 9-3 and the rear beam transporting vehicle synchronously move forwards;
(2) the rear girder transporting vehicle reaches the tail part of the front girder transporting vehicle, the rear overhead crane 9-4 moves to the position above the lifting point of the steel box girder 6, and the lower lifting appliance is connected with the upper lifting point of the steel box girder 6;
(3) the rear crown block is lifted to lift the rear end of the steel box girder 6 away from the combined type module girder transporting vehicle 7, so that the steel box girder (6) is in a suspended horizontal state.
In any of the above schemes, preferably, in the seventh step, the concrete beam falling step is:
(1) the front and rear crane lifting beams move longitudinally forward to the position above the beam falling position;
(2) the front and rear crown blocks simultaneously fall down to enable the bottom surface of the steel box girder 6 to reach the position 500mm above the high side cushion stone and stop;
(3) the front and rear overhead traveling cranes drive the lifting system to transversely move to the beam falling position through the transverse moving motor;
(4) the lifting system falls down to enable the steel box girder 6 to fall onto the pad stone, and the steel girder erection is completed.
According to the embodiment, the plate unit disclosed by the invention is subjected to fine machining and industrial operation in a processing plant, the standardization degree is high, the processing precision is high, the mechanical utilization rate of personnel is high, the environmental pollution is small, and the plate unit better meets the technical requirement of green construction.
The application of the BIM technology in the prefabrication construction of the 80m rigid-concrete composite beam provides accurate data support for the prefabrication of the steel beam, and the digitization level is higher.
The 80m steel beam is prefabricated in the whole hole, the quality is easy to guarantee, the self weight of the steel beam is small relative to that of a concrete beam, and the whole hole of the steel beam is transported to a bridge position in a beam transporting mode, so that the method is suitable for bridges without shipping conditions.
The steel box girders are spliced on the main splicing jig frame of a girder factory, the whole 80-meter hole steel box girders are erected, the steel box girders do not need to be segmented like the conventional process, temporary piers are arranged on site, and then the process of hoisting and splicing is adopted, so that the erection efficiency can be improved.
The original ground surface bearing capacity of most large-span bridge sites is poor or no transportation condition exists, large-tonnage vehicle transportation cannot be met, and the traditional supports are erected to carry out segment hoisting and have high requirements on the transportation condition. The mode of transporting the beam on the beam has no requirement on the bearing capacity of the bridge position, and the transportation problem is solved.
The conventional large-span steel box girder sectional hoisting process has overlarge welding or bolting workload, long field operation time and many potential safety hazards. The whole hole is assembled in the factory, so that the construction progress can be effectively accelerated, and the safety risk is reduced.
The truss type bridge girder erection machine adopts a walking type walking self-passing hole-passing mode, does not need to bundle a beam and additionally arrange a balance weight, and saves the time for passing holes and erecting the beam.
The steel beam of the long-span steel-concrete composite beam weighs 510 tons, and the truss type bridge girder erection machine can greatly reduce the weight of long-span bridge girder erection equipment and has strong wind load resistance.
The 80-meter span double-width steel box girder can be erected in place at one time, so that the construction efficiency is effectively improved, and the construction safety is improved.
The bridge girder erection machine solves the problems that due to the fact that the radius of a curve is small, traditional pushing construction of a single girder is difficult to control, and precision is difficult to control.
The method solves the difficult problem of whole-hole prefabrication and erection construction of the long-span steel box girder, provides a construction method of a large-span steel girder project which is more suitable for crossing rivers, roads and bridge sites and is unsuitable for the passage of construction vehicles, and improves the bridge construction technology.
The erection process implemented by the invention has the advantages that the large-span steel box girder is spliced in a whole hole, and the steel girder can be transported to the bridge site in a whole hole mode by transporting the girder on a double-width girder. The problem of whole-hole erection with the span of 80 meters is solved, and a new mode is opened up for the rapid erection of bridges in inland areas. .
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. A construction method for whole-hole splicing double-width erection in a 80-meter-span wide steel box girder factory is characterized by comprising the following steps of:
firstly, processing a bottom plate unit (2), a partition plate unit (3), an inclined web plate T-beam unit (4) and a cantilever arm unit (5) in a steel structure processing plant by using a BIM technology;
step two, arranging a steel box girder general assembly jig frame (1) in a girder factory general assembly area;
step three, machining a base machining bottom plate unit (2), a partition plate unit (3), an inclined web T-beam unit (4) and a cantilever unit (5) on the steel structure plate unit; sequentially transporting each component to a main assembly area of a beam factory through a transport vehicle for assembly;
step four, checking and accepting after the 80m steel box girder (6) is totally spliced;
fifthly, transporting the steel box girder (6) by a combined module girder transporting vehicle (7);
sixthly, positioning and anchoring legs after occupation of the large truss type bridge girder erection machine (9), and feeding the girder through the matching of the combined type module girder transporting vehicle (7) and the crown block;
step seven, beam falling;
and step eight, the front crown block and the rear crown block are matched with each other to lift and finish the erection of the left and right frames of the whole-hole steel box girder.
2. The construction method for splicing the whole holes and the double-width erection in the 80-meter wide-width steel box girder factory according to the claim 1 is characterized in that in the second step, a single set of the total splicing jig frame (1) is formed by assembling and welding 200 x 200 section steel, 80 x 80 square steel and 90 x 90 angle steel; the length of a single-set jig frame is 81 meters, the width of the single-set jig frame is 9.3 meters, 4 gantry cranes with 10t of assembled steel box girders are put into, welding equipment, pipeline gas and protective measures are arranged in a matched mode, equal-size concrete foundations are arranged below the total assembled jig frame (1), the concrete foundations have enough strength and cannot break, and the whole foundation is subjected to pressure bearing.
3. The whole-hole splicing double-width erection construction method in the 80-meter span wide-width steel box girder factory according to the claims 1-2, characterized in that in the third step, a bottom plate unit (2), a partition plate unit (3), an inclined web plate T-shaped girder unit (4) and an arm picking unit (5) are assembled and welded on a total splicing jig frame (1) in sequence, and transverse splicing welding seams of a box girder bottom plate, a web plate and a top plate are welded in a staggered mode by 200 mm; the partition plate, the bottom plate and the web plate are welded by carbon dioxide gas protection; the inner sides of the web plate and the bottom plate are welded under the protection of carbon dioxide gas, the outer sides of the web plate and the bottom plate are gouged back by a gouging machine, and the cover surface is filled by an automatic welding trolley.
4. The construction method for whole-hole splicing double-width erection in a 80-meter wide-width steel box girder factory according to claims 1-3, characterized in that in the fourth step, the steel box girder (6) is subjected to anticorrosion construction after being assembled, and the steel box girder (6) is subjected to anticorrosion treatment by combining the design drawing requirements and the current specifications; and (4) performing various acceptance according to design and specification requirements, and installing a permanent support in the beam factory after acceptance is qualified.
5. The whole-hole splicing double-width erection construction method in the 80-meter span wide-width steel box girder factory according to the claims 1-4, characterized in that in the fifth step, the combined type module transport vehicle (7) is provided with the camel beam (8), a 450T girder lifting machine is adopted to install the steel box girder (6) on the combined type module transport vehicle (7), the control room is used for controlling the girder transportation, and in order to ensure the correct track, a boundary line needs to be drawn for the girder transportation; and (4) transporting the beam to a beam feeding area by adopting a cross-double-width transportation mode, and arranging special persons on two sides of the beam transporting vehicle to monitor the operation of the beam transporting vehicle.
6. The construction method for whole-hole splicing double-width erection in a 80m span wide steel box girder factory according to claim 5, wherein in the sixth step, the total length of the truss type bridge girder erection machine (9) is 170 m, and the construction method is a walking type self-walking cantilever via hole mode; the middle supporting leg (9-1) and the front supporting leg (9-1) of the truss type bridge girder erection machine (9) are supported on the main bearing point of the main girder; the middle support leg (9-1) is anchored with the bridge deck through finish rolling deformed steel bars.
7. The construction method for whole-hole splicing double-width erection in the 80-meter span wide steel box girder factory according to the claims 1-6, wherein in the sixth step, the concrete beam feeding step is as follows:
(1) the front girder transporting vehicle reaches the rear position of the middle supporting leg (9-1), the front overhead traveling crane (9-3) issues a lifting appliance to be connected with the upper lifting point of the steel box girder (6), and the front overhead traveling crane (9-3) and the rear girder transporting vehicle synchronously move forwards;
(2) the rear beam transporting vehicle reaches the tail part of the front beam transporting vehicle, the rear overhead vehicle (9-4) moves above the lifting point of the steel box beam (6), and the lower lifting tool is connected with the upper lifting point of the steel box beam (6);
(3) the rear crown block is lifted to lift the rear end of the steel box girder (6) away from the combined type module girder transporting vehicle (7), so that the steel box girder (6) is in a suspended horizontal state.
8. The construction method for whole-hole splicing double-width erection in the 80-meter wide-width steel box girder factory according to claim 7, wherein in the seventh step, the concrete beam falling step is as follows:
(1) the front and rear crane lifting beams move longitudinally forward to the position above the beam falling position;
(2) the front and rear crown blocks simultaneously fall down to enable the lower bottom surface of the steel box girder (6) to reach the position 500mm above the high side cushion stone and stop;
(3) the front and rear overhead traveling cranes drive the lifting system to transversely move to the beam falling position through the transverse moving motor;
(4) the lifting system falls down to enable the steel box girder (6) to fall onto the pad stone, and the steel girder erection is completed.
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