CN109797651B - Flat combined box girder with corrugated steel plate inner mold - Google Patents
Flat combined box girder with corrugated steel plate inner mold Download PDFInfo
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Abstract
The invention relates to a flat combined box girder with a corrugated steel plate internal mold, which adopts a corrugated steel plate with honeycomb holes on the belly as the internal mold of a flat combined box girder structure, wherein a plurality of full-belly steel structure transverse partition plates with manholes are arranged inside a corrugated steel plate groove, and horizontal truss support systems are arranged at the top and the bottom of the corrugated steel plate groove to form an internal framework of the flat combined box girder. Laying a profiled steel sheet on the upper part of the inner mould framework, pouring a high-strength concrete top plate, sticking a carbon fiber cloth reinforced strip on the lower part of the inner mould framework, and welding and connecting air nozzles on the two sides of the inner mould framework to form a segment of the flat combined box girder. And hoisting the flat combined box girder segment by using the cantilever, installing the stay cable, pouring a concrete post-pouring belt, and circularly constructing the cantilever until the bridge is closed.
Description
Technical Field
The invention belongs to the field of bridge engineering, relates to a flat box girder structure of a cable-stayed bridge, and particularly relates to a flat combined box girder with a corrugated steel plate inner mold.
Background
With the progress of structural theory analysis, the application of high-strength materials, the improvement of construction methods and anticorrosion technology, the cable-stayed bridge becomes the most popular bridge type in a medium-long span range due to the excellent structural performance and aesthetic characteristics of the cable-stayed bridge.
The main beam of the medium-and-large-span cable-stayed bridge usually adopts a streamline thin-wall flat box girder structure, the flat box girder has the advantages of large torsional rigidity, good wind resistance and the like, the height-width ratio of the flat box girder can reach about 1:10 generally, and the main beam mainly has two structural forms of a concrete thin-wall flat box girder and a flat steel box girder at present.
The concrete thin-wall flat box girder has the advantages of low manufacturing cost, convenience in bridge deck pavement, good wind resistance stability, good durability and the like, but has the defects of great weight, long construction period and the like. The flat steel box girder has the advantages of light dead weight, high bearing capacity, high factory degree, short construction period and the like, but has the defects of high manufacturing cost, poor corrosion resistance and the like. Along with the increase of the number of the cable-stayed bridges, the combined advantages of a concrete structure and a steel structure are utilized, and the development of the flat box girder of the combined structure is imperative according to the stress characteristics of the main girder of the cable-stayed bridge.
Aiming at the requirement of a flat combined box girder structure, the corrugated steel plate with honeycomb holes on the belly is adopted as an inner mold of the flat combined box girder structure, a plurality of full-belly steel structure diaphragm plates with manholes are arranged inside a corrugated steel plate groove, horizontal truss support systems are arranged at the top and the bottom of the corrugated steel plate groove, an inner framework of the flat combined box girder is formed, then, tuyere structures are arranged on two sides of the corrugated steel plate groove, high-strength carbon fiber cloth reinforced strips are pasted on the lower portion of the corrugated steel plate groove, profiled steel plates are arranged on the top of the corrugated steel plate, a reinforced concrete top plate is poured, and the flat combined box. In a construction site of the cable-stayed bridge, a cantilever hoists the flat combined box girder segments, the flat combined box girders are welded and assembled, a cable-stayed bridge inhaul cable is installed, a reinforced concrete roof post-cast strip is poured, the cantilever is circularly constructed until the bridge is closed, a bituminous pavement is paved, and the bridge is communicated with a vehicle. The flat combined box girder structure has the advantages of convenience in manufacturing and processing, low manufacturing cost, light dead weight, high bearing capacity, good internal permeability, good wind resistance stability of the structure, high industrialization degree, high hoisting construction speed, good corrosion resistance and durability, convenience in bridge deck pavement and the like.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a flat combined box girder with a corrugated steel plate inner die and a preparation method thereof.
The technical scheme is as follows: in order to solve the technical problem, the flat combined box girder with the corrugated steel plate inner mold comprises an inner mold framework, a profiled steel plate high-strength concrete top plate and a carbon fiber cloth reinforced strip, wherein the profiled steel plate high-strength concrete top plate and the carbon fiber cloth reinforced strip are respectively arranged at the upper part and the lower part of the inner mold framework; the centre form skeleton includes the wave form steel sheet, sets up the multichannel cross slab in the recess of wave form steel sheet, sets up horizontal truss braced system at the top surface of wave form steel sheet recess, and the horizontal bridge of centre form skeleton sets up the tuyere to the left and right sides, forms flat combination box girder segment section, still sets up the suspension cable on the flat combination box girder.
The horizontal truss support system comprises a transverse connecting beam, a longitudinal connecting beam and a cross steel pipe support.
The profiled steel plate high-strength concrete top plate comprises profiled steel plates, a high-strength concrete top plate and studs, angle steel connecting pieces are welded on two sides of a transverse connecting beam, the profiled steel plates are laid between the angle steel connecting pieces, the studs are arranged on the top surface of the inner formwork framework, and the high-strength concrete top plate is poured.
Wherein, the corrugated steel plate is formed by the positive and negative crisscross welding of a plurality of U template order, is provided with hexagon honeycomb holes on the lateral wall of each U template.
The invention also provides a preparation method of the flat combined box girder with the corrugated steel plate inner mold, which comprises the following steps:
the method comprises the following steps: in a bridge prefabrication factory, arranging a site, organizing construction materials, simulating an H-shaped steel honeycomb beam manufacturing process, cutting a plane steel plate by a fold line, bending the plane steel plate into a U shape, welding and connecting the plane steel plate into a corrugated steel plate with honeycomb holes on the belly after dislocation, arranging a plurality of transverse partition plates in a groove of the corrugated steel plate, welding and connecting a transverse connecting beam, a longitudinal connecting beam and a crossed steel pipe support on the top and bottom surfaces of the groove of the corrugated steel plate to form a horizontal truss support system, and prefabricating an inner framework of a flat combined box beam in the factory;
step two: transporting an inner mold framework of the flat combined box girder to a construction site, paving a profiled steel sheet on the upper part of the inner mold framework, fixedly connecting by using studs, arranging a reinforcing mesh, pouring a high-strength concrete top plate to form the profiled steel sheet high-strength concrete top plate, then sticking a carbon fiber cloth reinforced strip on the lower part of the inner mold framework, and welding and connecting air nozzles on the left side and the right side of the transverse bridge direction of the inner mold framework to form a segment of the flat combined box girder;
step three: in a construction site, a cantilever hoists the flat combined box girder segment, a stay cable is installed, a cable-stayed bridge is welded to connect the flat combined box girder main girder, a concrete post-cast strip is poured, and the concrete of the post-cast strip is cured;
step four: and (4) circularly constructing the cantilever until the bridge is closed, installing the handrail, paving the asphalt pavement and enabling the bridge to be communicated.
Has the advantages that: the wave form steel sheet that the application belly has honeycomb holes is as flat combination case girder construction's centre form, set up real abdomen formula steel construction cross slab and set up horizontal truss braced system in its wave form steel sheet recess is inside, install the tuyere structure in its both sides, paste high strength carbon cloth and add the muscle strip in its lower part, set up the profiled sheet and pour the reinforced concrete roof at its top, form flat combination case girder construction, it is convenient to have preparation processing, the cost is low, the dead weight is light, the bearing capacity is high, inside permeability is good, the structure anti-wind stability is good, the industrialization degree is high, hoist and mount construction speed is fast, anticorrosive durability is good and bridge deck pavement advantage such as convenient.
The existing concrete thin-wall flat box girder has the advantages that the self weight is large, the using amount of stay cable steel wires is increased, the section sizes of a main tower and a foundation are increased, and the construction period of on-site cantilever segment-by-segment pouring of the concrete thin-wall flat box girder is long, so that the concrete thin-wall flat box girder can only be suitable for a small-span cable-stayed bridge structure. The flat combined box girder structure has the advantages of greatly reduced dead weight, convenient factory prefabrication and processing, high construction speed of hoisting, welding and assembling the on-site cantilever segment by segment, and capability of being used for a medium-and-large-span cable-stayed bridge structure.
The existing flat steel box girder is a typical orthogonal special-shaped plate structure, a bridge deck steel plate is additionally provided with a U-shaped steel stiffening rib, the flat steel box girder is a closed box-shaped structure, the flat steel box girder needs to be welded and manufactured inside the closed box girder, and the manufacturing process is complex and difficult. The flat combined box girder adopts the corrugated steel plate as the inner mold of the box girder structure, the manufacturing process is an open welding manufacturing method, the box girder top plate is formed by laying the profiled steel plate and pouring the reinforced concrete, the box girder bottom plate is formed by sticking the high-strength carbon fiber cloth reinforced strip, the manufacturing process is simple, and the complicated box girder inner welding manufacturing process is avoided.
The flat steel box girder is used as a main girder of a medium-and-large-span cable-stayed bridge, the section of the flat steel box girder bears huge longitudinal pressure due to the longitudinal horizontal component force accumulation effect of the steel wire stay cables, a large number of U-shaped steel stiffening ribs need to be arranged for preventing a steel structure top plate of the flat steel box girder from being buckled under pressure, so that the steel consumption is greatly increased, and the obvious unreasonable material selection is realized by bearing huge compressive stress by using steel plate materials. The flat combination box girder structure roof is that profiled sheet pours high strength steel bar high strength concrete roof, has powerful compressive capacity, need not set up U shaped steel stiffening rib, can practice thrift the steel sheet quantity in a large number.
The steel bridge deck pavement of the flat steel box girder is a technical difficulty, under the severe use conditions of overload and extreme high temperature, fatigue bonding damage is easy to occur between the ordinary asphalt concrete pavement and a steel bridge deck, the bridge deck pavement damage influences traffic, the bridge deck water seepage corrosion steel plate influences the structural durability, expensive epoxy asphalt concrete pavement materials are needed to be adopted, and the construction cost is increased. The flat combined box girder structure top plate is a profiled steel sheet poured reinforced concrete top plate, the rigidity of the concrete top plate is greatly increased, the deformation of the bridge deck is not large under the severe use conditions of overload and extreme high temperature, and the common asphalt concrete bridge deck pavement is not easy to crack and damage, so the flat combined box girder structure top plate can improve the structural durability and reduce the difficulty of bridge deck pavement.
The traditional flat steel box girder adopts a combined truss type longitudinal partition plate, and has a complex structure and difficult manufacturing and construction; borrow for reference H shaped steel honeycomb roof beam, set up honeycomb holes at the belly of wave form steel sheet, form the wave form steel sheet that the belly has honeycomb holes, have that the dead weight is light, the type of passing through is good, bearing capacity is high and the big characteristics of rigidity, compare with the combination truss longitudinal baffle of flat steel box girder case roof beam, its building simple structure, corrosion resistance is good.
The corrugated steel plate with the honeycomb holes in the belly is used as an inner die, a diaphragm plate and a horizontal truss supporting system are arranged in the corrugated steel plate to form an inner framework of a flat combined box girder, the corrugated steel plate is a combined system of the steel box girder and a truss structure, and the corrugated steel plate has the advantages of good space integrity, torsional rigidity, good internal permeability and the like, and is convenient to process and manufacture.
The flat combination box girder structure roof is formed by laying profiled steel sheets on the upper part of the corrugated steel sheet internal mold and pouring ultrahigh-strength concrete, the U-shaped steel stiffening ribs of the flat steel box girder do not need to be arranged, and the manufacturing process is simple. The profiled steel plate poured reinforced concrete roof has high structural rigidity, can bear the longitudinal pressure caused by the great longitudinal component force of the steel wire stay cable, can bear the roof bending compressive stress caused by overloaded vehicles in the transverse bridge direction, and the profiled steel plate ultrahigh-strength concrete bridge deck of the flat combined box girder conforms to the stress characteristics of a main girder structure of a cable-stayed bridge.
The flat combined box girder structure bottom plate is formed by sticking the high-strength carbon fiber cloth reinforced strip on the lower part of the internal mold of the corrugated steel plate, the manufacturing process is simple, the good wind-resistant body is kept, the full-spread steel plate on the lower part of the flat steel box girder is avoided, a large number of steel plates are saved, the manufacturing cost is reduced, and the structure weight is reduced. Under the action of vehicle load, the transverse direction of the box-shaped main beam of the cable-stayed bridge is in a bending state, and according to the beam string structure principle, the lower part of the flat combined box beam adopts a construction method of pasting a light high-strength carbon fiber cloth reinforced strip, so that the transverse direction can bear the bending tensile stress of a bottom plate caused by an overloaded vehicle.
The flat combined box girder structure has unique conception, a steel box girder and truss structure combined system consisting of the corrugated steel plate, the diaphragm plate and the horizontal truss support system is used as an internal mold framework of the flat combined box girder, the profiled steel plate is poured with the high-strength reinforced steel bar and the super-strength concrete top plate is used as a bridge deck top plate of the flat combined box girder to bear huge compressive stress, and the lower part of the flat combined box girder is stuck with the light high-strength carbon fiber cloth reinforced strip to bear the bending tensile stress of a transverse bridge to a bottom plate caused by overloaded vehicles.
Drawings
FIG. 1 is a schematic cross-sectional view of a flat composite box girder according to the present invention;
FIG. 2 is a three-dimensional schematic view of the corrugated steel plate with honeycomb holes in the belly of FIG. 1;
FIG. 3 is a schematic longitudinal cross-sectional view of a flat box girder according to the present invention;
FIG. 4 is a schematic plan view of the flat combination box girder horizontal truss support system and profiled steel sheets;
figure 5 is a three-dimensional schematic view of an inner former frame;
FIG. 6 is a detail thumbnail view of a node;
fig. 7 is a three-dimensional schematic view of a flat composite box beam segment of the present invention.
In the figure: 1-an inner mold framework; 11-corrugated steel plate; 12-steel diaphragm plate; 13-a horizontal truss support system; 131-transverse tie beam; 132-longitudinal tie-down beams; 133-cross steel pipe support; 2-a profiled steel sheet high-strength concrete top plate; 21-profiled steel sheet; 22-high strength concrete top plate; 23-a stud; 24-angle steel connectors; 3-carbon fiber cloth reinforced strip; 4-a tuyere; 5-stay cable.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the flat combined box girder with the corrugated steel plate inner mold of the invention is composed of an inner mold framework 1, a profiled steel plate high-strength concrete top plate 2 and a carbon fiber cloth reinforced strip 3, wherein the inner mold framework 1 comprises a corrugated steel plate 11, a plurality of transverse partition plates 12 are arranged in a groove of the corrugated steel plate 11, a horizontal truss support system 13 is arranged on the top bottom surface of the groove of the corrugated steel plate 11, the profiled steel plate high-strength concrete top plate 2 is arranged on the upper part of the inner mold framework 1, the carbon fiber cloth reinforced strip 3 is adhered on the lower part of the inner mold framework 1, and tuyere 4 are welded on two sides of the inner mold framework 1 to form a flat combined box girder segment, a cantilever of the flat combined box girder segment is hoisted by a construction site, and a stay cable 5 is installed to form a.
As shown in fig. 4 and 6, the horizontal truss support system 13 includes transverse tie beams 131, longitudinal tie beams 132, and cross steel pipe supports 133.
As shown in fig. 3 and 6, the profiled steel sheet high strength concrete roof panel 2 includes a profiled steel sheet 21, a high strength concrete roof panel 22 and studs 23, angle steel connectors 24 are welded to both sides of the transverse tie beam 131, the profiled steel sheet 21 is laid between the angle steel connectors 24, the studs 23 are provided on the top surface of the inner mold framework 1, and the high strength concrete roof panel 22 is cast.
The invention also provides a preparation method of the flat combined box girder with the corrugated steel plate inner mold, which comprises the following steps:
step 1, in a bridge prefabrication factory, arranging a site, organizing construction materials, simulating an H-shaped steel honeycomb beam manufacturing process, cutting a plane steel plate by a fold line, bending the plane steel plate into a U shape, welding and connecting the plane steel plate into a corrugated steel plate 11 with honeycomb holes on the belly after dislocation, arranging a plurality of transverse partition plates 12 in grooves of the corrugated steel plate 11, welding and connecting a transverse connecting beam 131, a longitudinal connecting beam 132 and a crossed steel pipe support 133 on the top and bottom surfaces of the grooves of the corrugated steel plate 11 to form a horizontal truss support system 13, and prefabricating an inner mold framework 1 of a flat combined box beam in the factory;
and 4, circularly constructing the cantilever until the bridge is closed, mounting the handrail, paving the asphalt pavement and enabling the bridge to pass through.
The invention is further described below by way of an example.
In a 880-meter large-span cable-stayed bridge, a main beam of the cable-stayed bridge adopts a flat combined box beam, the bridge width is 30 meters, the distance between stay cables is 15 meters, the height of a central line beam of the flat combined box beam is 3 meters, and the height-span ratio of the main beam is 1: 10.
The steel diaphragm plates and the horizontal truss support systems are arranged in the corrugated steel plate grooves to form an internal framework of the flat combined box girder. The thickness of the corrugated steel plate is 12mm, the peak height is 3 m, the wave distance is 7.5 m, the width of the lower part of the trapezoidal groove is 2.5 m, the width of the upper opening of the trapezoidal groove is 5 m, and the expansion ratio of the web plate honeycomb hole beam is 1.6. The thickness of the steel transverse partition plate is 10mm, and the distance is 3.
The horizontal truss support system is supported by a transverse connecting beam, a longitudinal connecting beam and a cross steel pipe, the transverse connecting beam is a 500mm by 300mm steel pipe concrete beam, the longitudinal connecting beam is a 300mm by 2200mm square steel pipe beam, and the cross steel pipe horizontally supports a steel pipe with the diameter of 100 mm.
The profiled steel plates are fixedly connected with the longitudinal bridge direction through studs, angle steel connecting pieces are welded on two sides of the transverse connecting beams, the profiled steel plates sink and are embedded between the transverse connecting beams, the profiled steel plates are of a YX130-300-600 type, the thickness of the steel plates is 1.6mm, bidirectional reinforcing meshes are arranged on the profiled steel plates, C120 high-strength concrete is poured, the thickness of the concrete plates is 200mm, and the profiled steel plate high-strength concrete top plate is formed.
Three layers of carbon fiber cloth reinforced strips with the width of 500mm are adhered to the lower portion of the corrugated steel plate in the transverse bridge direction, the tensile strength of the carbon fiber cloth is 3500MPa, the thickness of each layer of carbon fiber cloth is 0.167mm (300g), and then air nozzles are welded and connected to the two sides of the corrugated steel plate to form sections of the flat combined box girder.
The cantilever hoists the flat combined box girder segment, installs the stay cable, welds the cable-stayed bridge and connects the flat combined box girder, pours the concrete post-cast strip, and the cantilever is constructed in a circulating way until the bridge is closed, and the asphalt pavement is paved, and the bridge is open.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. The utility model provides a flat combination case roof beam with wave form steel sheet centre form which characterized in that: comprises an internal mold framework (1), a profiled steel sheet high-strength concrete top plate (2) arranged on the upper part of the internal mold framework (1) and a carbon fiber cloth reinforced strip (3) arranged on the lower part of the internal mold framework; the inner mold framework (1) comprises a corrugated steel plate (11), a plurality of transverse partition plates (12) are arranged in a groove of the corrugated steel plate (11), a horizontal truss support system (13) is arranged on the top surface of the groove of the corrugated steel plate (11), air nozzles (4) are arranged on the left side and the right side of a transverse bridge of the inner mold framework (1) to form a flat combined box girder segment, and a stay cable (5) is further arranged on the flat combined box girder; the horizontal truss support system (13) comprises a transverse connecting beam (131), a longitudinal connecting beam (132) and a crossed steel pipe support (133); the profiled steel plate high-strength concrete top plate (2) comprises profiled steel plates (21), high-strength concrete top plates (22) and studs (23), angle steel connecting pieces (24) are welded on two sides of a transverse connecting beam (131), the profiled steel plates (21) are laid between the angle steel connecting pieces (24), the studs (23) are arranged on the top surface of the inner mold framework (1), and the high-strength concrete top plates (22) are poured.
2. The flat combined box girder with the corrugated steel plate inner die as claimed in claim 1, wherein: the corrugated steel plate (11) is formed by sequentially and reversely welding a plurality of U-shaped plates in a staggered manner, and hexagonal honeycomb holes are formed in the side wall of each U-shaped plate.
3. A method for manufacturing a flat composite box girder with an inner mold of a corrugated steel plate according to claim 1, comprising the steps of:
the method comprises the following steps: in a bridge prefabrication factory, arranging a site, organizing construction materials, imitating a manufacturing process of an H-shaped steel honeycomb beam, cutting a plane steel plate by a fold line, bending the plane steel plate into a U shape, welding and connecting the U-shaped steel plate into a corrugated steel plate (11) with honeycomb holes on the belly after dislocation, arranging a plurality of transverse partition plates (12) in grooves of the corrugated steel plate (11), welding and connecting a transverse connecting beam (131), a longitudinal connecting beam (132) and a crossed steel pipe support (133) on the top surfaces of the grooves of the corrugated steel plate (11) to form a horizontal truss support system (13), and prefabricating an inner framework (1) of a flat combined box beam in the factory;
step two: transporting an inner mold framework (1) of the flat combined box girder to a construction site, paving a profiled steel sheet (21) on the upper part of the inner mold framework (1), fixedly connecting by using studs (23), arranging a reinforcing mesh, pouring a high-strength concrete top plate (22) to form the profiled steel sheet high-strength concrete top plate (2), then pasting a carbon fiber cloth reinforced strip (3) on the lower part of the inner mold framework (1), and welding and connecting air nozzles (4) on the left side and the right side of a transverse bridge of the inner mold framework (1) to form a segment of the flat combined box girder;
step three: in a construction site, a cantilever hoists the flat combined box girder segment, a stay cable (5) is installed, a cable-stayed bridge is welded to connect the flat combined box girder main girder, a concrete post-cast strip is poured, and the concrete of the post-cast strip is cured;
step four: and (4) circularly constructing the cantilever until the bridge is closed, installing the handrail, paving the asphalt pavement and enabling the bridge to be communicated.
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| CN111305040A (en) * | 2020-02-28 | 2020-06-19 | 广东省交通规划设计研究院股份有限公司 | Cable-stayed bridge combined box girder adopting corrugated steel plate as diaphragm plate |
| CN114382002A (en) * | 2020-10-20 | 2022-04-22 | 华中科技大学 | Steel box-concrete composite beam inter-box beam connecting structure and construction method |
| CN112627038A (en) * | 2020-12-17 | 2021-04-09 | 江苏恒睿杰钢结构工程有限公司 | Installation and construction method of steel box girder of steel structure bridge |
| CN113897852A (en) * | 2021-10-27 | 2022-01-07 | 镇江港务集团有限公司 | Light-weight road and bridge structure based on basalt continuous fiber composite bars |
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| JP2001020227A (en) * | 1999-07-09 | 2001-01-23 | Mitsui Miike Mach Co Ltd | Carrying method of corrugated steel plate web member in bridge execution |
| CN1320210C (en) * | 2005-04-06 | 2007-06-06 | 湖南大学 | Steel-concrete combination backbone beam with big cantilever corrugated steel web overhanging beam |
| CN2839363Y (en) * | 2005-10-20 | 2006-11-22 | 中铁大桥勘测设计院有限公司 | Stayed-cable bridge steel-concrete box shape combined bridge girder |
| CN101429791A (en) * | 2008-12-20 | 2009-05-13 | 宫海西 | Girder-embedded continuous box-shaped reinforced concrete beam board and its production technique |
| CN101864729A (en) * | 2010-06-25 | 2010-10-20 | 清华大学 | Corrugated steel webplate combined box girder floor system for cable-stayed bridge and construction method thereof |
| CN203668810U (en) * | 2013-12-30 | 2014-06-25 | 郑州大学 | PC combined box girder of corrugated steel webs |
| CN109137718A (en) * | 2018-09-27 | 2019-01-04 | 中交公路规划设计院有限公司 | Lightweight steel-coarse aggregate Reactive Powder Concrete combined beam structure |
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