CN114016370A - 'hysteresis type' narrow steel box composite beam and construction method thereof - Google Patents
'hysteresis type' narrow steel box composite beam and construction method thereof Download PDFInfo
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- CN114016370A CN114016370A CN202111501391.1A CN202111501391A CN114016370A CN 114016370 A CN114016370 A CN 114016370A CN 202111501391 A CN202111501391 A CN 202111501391A CN 114016370 A CN114016370 A CN 114016370A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 130
- 239000010959 steel Substances 0.000 title claims abstract description 130
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 238000009434 installation Methods 0.000 claims abstract description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 33
- 239000004917 carbon fiber Substances 0.000 claims description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 238000003466 welding Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000001727 in vivo Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D19/00—Structural or constructional details of bridges
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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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
The invention discloses a 'hysteresis type' narrow steel box composite beam and a construction method thereof, belonging to the field of engineering construction. According to the invention, the narrow steel box girder based on high-strength steel is adopted, so that the steel consumption of the narrow steel box girder is saved, the structural transportation and installation difficulty is reduced, and the construction cost is saved on the premise of meeting the requirements of stress, construction and maintenance.
Description
Technical Field
The invention belongs to the field of engineering construction, particularly the field of bridges, and particularly relates to a 'hysteresis type' steel-concrete composite beam for efficiently applying prestress.
Background
The steel-concrete composite beam can fully play the using performances of two materials of steel structure tensile and concrete compression resistance, and particularly has light dead weight and strong adaptability compared with a concrete beam in the field of bridge engineering; compared with the narrow steel box girder, the steel box girder has the advantages of high rigidity, good durability of the bridge deck, low operation and maintenance cost and high economy. The concrete structure as the bridge deck can overcome the fatigue and the corrosion prevention problems of steel components. The steel member can effectively improve the service life of the bridge as the main stress member. Therefore, steel-concrete composite girder bridges are increasingly used in construction.
In order to enhance the torsional resistance, the overall stability and the span capacity of the composite beam, a steel box composite beam is generally adopted, and meanwhile, in order to enable the whole section of a concrete bridge deck of the composite beam to be pressed, particularly to solve the problem of cracking of the bridge deck in a negative moment region, a longitudinal prestressed steel beam is generally required to be tensioned in a concrete slab. The width of the traditional steel box combination beam bridge is generally more than 2m, and the concrete slab and the narrow steel box beam are combined into an integral prestressed steel bundle for post-tensioning the concrete slab through cast-in-place or wet joint.
However, the conventional steel box composite girder and the construction method thereof have the following problems:
(1) the box body has larger structural size, heavier sections and inconvenient transportation and installation;
(2) the applied prestress part is transferred to the narrow steel box girder through the shear nails, so that the effective prestress of the concrete slab is reduced;
(3) the prestress transferred to the narrow steel box girder through the shear nails increases the load of the narrow steel box girder, and the section and the steel consumption of the narrow steel box girder need to be increased;
(4) particularly in the hogging moment area, in order to prevent the bridge deck from cracking, a large amount of prestressed steel bars need to be arranged, so that great material waste is caused;
(5) due to the effect of concrete shrinkage and creep, after the bridge is operated for a period of time, the prestress in the concrete slab loses most of the effect, and the durability and the safety of the structure are affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a 'hysteresis type' prestress narrow-width steel box composite beam and a construction method thereof.
The purpose of the invention is realized by the following technical scheme:
a 'hysteresis type' narrow steel box composite beam comprises a narrow steel box beam, a prestressed prefabricated bridge deck, a wet joint, an internal longitudinal prestressed steel beam and a profile steel cross beam;
prefabricated decking sets up in narrow steel box girder top, be equipped with the shear force groove on the prefabricated decking, narrow steel box girder top is equipped with the shear force nail, the shear force nail inserts in the shear force groove to at the concrete of shear force inslot pouring, prefabricated decking and narrow steel box girder formation rigid connection, form longitudinal connection through wet seam and internal longitudinal prestress steel bundle between the prefabricated decking of prestressing force, stretch-draw is accomplished before concrete placement in wet seam and shear force groove to the internal longitudinal prestress steel bundle of prestressing force prefabricated decking, butt welding formation is connected before the stretch-draw in the wet seam internal longitudinal prestress steel bundle, narrow width steel box girder transversely connects through shaped steel crossbeam.
The further technology of the invention is as follows:
preferably, narrow steel box girder in be equipped with external carbon fiber prestressed cable, external carbon fiber prestressed cable stretch-draw department sets up the cross slab, sets up the vertical stiffening rib of baffle, manhole on the cross slab and puts more energy into, sets up anchor bedplate and anchor backing plate in anchor department.
Preferably, the external carbon fiber prestressed cable comprises an initial tensioning external carbon fiber prestressed cable and a spare external carbon fiber prestressed cable.
The concept of "hysteresis" includes two aspects: 1) the prestressed bridge deck is combined with the steel beam after the longitudinal prestress tension in the body; 2) and the post-lag external carbon fiber prestressed cable is subjected to post-lag tensioning, the initial tensioning external carbon fiber prestressed cable is tensioned after the second-stage load construction, and the spare external carbon fiber prestressed cable is used for reinforcing and reinforcing the bridge after operation.
Preferably, C55 is poured in the wet joints and the shear grooves to compensate for shrinkage concrete.
Preferably, the narrow steel box girder is formed by welding a top plate, a web plate and a bottom plate, a top plate stiffening rib and a bottom plate stiffening rib are welded in the narrow steel box girder, bottom plate concrete is arranged on the bottom plate, and the shear nails are welded on the top plate.
Preferably, the bottom plate concrete is C50 steel fiber concrete.
The invention also provides a construction method of the 'hysteresis type' prestress narrow-width steel box composite beam, which comprises the following steps:
step (1): the manufacturing of the narrow steel box girder section is completed in a factory according to the drawing size, the length of the girder section is adjusted according to factors such as transportation and hoisting capacity, the appearance of a component is accurately machined during manufacturing, the welding reliability is ensured, and the shear nails are welded on the top plate after the narrow steel box girder is manufactured;
step (2): a factory accurately prefabricates the bridge deck according to the structure size, and pays attention to the preservation of the prestressed steel beam pipeline and the shear groove;
and (3): transporting the narrow steel box girder to a construction site by adopting a flat car or other vehicles according to the specific situation of the position of the bridge;
and (4): after the beam sections are transported to the designed positions, a support is erected below the main beams, after the reliability of the support is ensured, the narrow steel box beam sections are hoisted by adopting an automobile crane or a crawler crane, and the section steel cross beams between the main beams are welded;
and (5): hoisting all prefabricated bridge decks, connecting longitudinal steel bars in the butt welding wet joint, and tensioning all in-vivo longitudinal prestressed steel bundles at one time;
and (6): c55 compensation shrinkage concrete is poured in the wet joint and the shear groove;
and (7): c50 steel fiber concrete is poured in the narrow steel box girder;
and (8): after the wet joint and the concrete in the shear groove reach the design strength, the auxiliary implementation installation such as bridge deck pavement is completed;
and (9): stretching an initial external carbon fiber prestressed cable;
step (10): and (4) traffic operation, and later stage tensioning the spare external carbon fiber prestressed cable according to the operation condition of the bridge for reinforcement.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. according to the 'hysteresis type' prestress narrow-width steel box composite beam and the construction method thereof, the narrow-width steel box main beam based on high-strength steel is adopted, so that the steel consumption of the narrow steel box beam is saved, the structural transportation and installation difficulty is reduced, and the construction cost is saved on the premise of meeting the requirements of stress, construction and maintenance;
2. the 'hysteresis type' prestress method effectively solves the problem that the applied prestress is transmitted to the narrow steel box girder through the shear nails, the generated prestress in the concrete is 1.2-1.5 times of that of the conventional prestress method, the steel consumption of the prestressed reinforcement and the girder is saved, the adopted external carbon fiber prestressed cable is light, high in strength and corrosion resistant, the later-stage structure reinforcement and reinforcement are facilitated, the service life of the structure is obviously prolonged, the construction cost is effectively reduced, and the economic benefit is obvious;
3. the 'hysteresis type' prestressing method adopted by the invention economically and efficiently solves the problem of the traditional combined beam of cracking in the hogging moment area;
4. the 'hysteresis type' prestress narrow-width steel box combination beam and the construction method thereof have the advantages of simple and reasonable structure, convenient construction and strong universality, can be widely applied to other engineering construction fields except bridge engineering, and have wide application prospects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a portion of the narrow steel box composite beam of FIG. 1;
fig. 3 is a schematic view of the deck plate of fig. 1.
In the drawing, 1-narrow steel box girder, 2-prefabricated bridge deck slab, 3-wet joint seam, 4-shear groove, 5-shear nail, 6-internal longitudinal prestressed steel strand, 7-C55 compensating shrinkage concrete, 8-top plate, 9-web plate, 10-bottom plate, 11-section steel beam, 12-initial tension external carbon fiber prestressed cable, 13-spare external carbon fiber prestressed cable, 14-bottom plate stiffening rib, 15-top plate stiffening rib, 16-bottom plate concrete, 17-horizontal diaphragm, 18-diaphragm vertical stiffening rib, 19-manhole, 20-manhole stiffening, 21-anchor seat plate and 22-anchor backing plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, the 'hysteresis type' narrow steel box composite beam comprises a narrow steel box beam 1, a prestressed prefabricated bridge deck 2, a wet joint 3, a shear groove 4, a profile steel cross beam 11 and a bottom plate concrete 16.
The width of the narrow steel box girder is 1.2m, the height of the narrow steel box girder is not more than 4m, and Q370qD or high-strength steel with higher bearing capacity is adopted.
The concrete 16 of the bottom plate in the narrow steel box girder 1 is arranged on the bottom plate 10, the shear nails of the narrow steel box girder are welded 5 on the top plate 8, the carbon fiber prestressed cable stretching part outside the body of the narrow steel box girder is provided with a diaphragm plate 17, the diaphragm plate 17 is provided with a vertical stiffening rib 18, a manhole 19 and a manhole stiffening rib 20, the anchoring part is provided with an anchor plate 21 and an anchor backing plate 22, and the narrow steel box girder 1 is transversely connected through the steel beam 10.
The prefabricated bridge deck is made of C50 prefabricated concrete, the longitudinal length is 2.5-3.5 m, the transverse width is 10-16 m, the plate thickness of a common section is not less than 25cm, and the plate thickness of a steel beam support part is 40 cm.
The prefabricated bridge deck 2 is rigidly connected with the steel beam 1 through a shear nail 5 welded on the steel beam and positioned in a shear groove 4; the prestressed prefabricated bridge panels 2 are longitudinally connected through wet joints 3 and longitudinal prestressed steel bundles 6; tensioning the longitudinal prestress 6 steel bundle in the prestress prefabricated bridge deck body before pouring the 4C55 compensation shrinkage concrete 7 in the wet joint 3 and the shear groove; longitudinal steel bars in the wet joint of the prestressed prefabricated bridge deck 2 are in butt welding to form connection before the prestressed steel bundles are tensioned; and (4) performing backstepping tensioning on the carbon fiber prestressed cable outside the backstepping body.
The concept of "hysteresis" includes two aspects: 1) the prestressed bridge deck is combined with the steel beam after the longitudinal prestress tension in the body; 2) and the post-lag external carbon fiber prestressed cable is subjected to post-lag tensioning, the initial tensioning external carbon fiber prestressed cable is tensioned after the second-stage load construction, and the spare external carbon fiber prestressed cable is used for reinforcing and reinforcing the bridge after operation.
C55 compensation shrinkage concrete is poured in the wet joint;
c55 compensation shrinkage concrete is poured in the shear groove;
the bottom plate concrete is C50 steel fiber concrete and has the thickness of 20-30 cm;
the external carbon fiber prestressed cable is made of a composite material consisting of carbon fibers and resin, has the density of 1/5-1/4 of that of conventional steel, has the strength of 7.6-15 times that of the conventional steel, and comprises two parts, namely an initial tensioned external carbon fiber prestressed cable and a spare external carbon fiber prestressed cable;
and the initial external carbon fiber prestressed cable 12 is tensioned after the second-stage load construction, and the spare external carbon fiber prestressed cable 13 is used for reinforcing the bridge after operation.
The construction method of the 'hysteresis type' prestress narrow steel box combination comprises the following steps:
manufacturing a narrow steel box girder 1 girder section according to the drawing size in a factory, manufacturing related partition plates and stiffening ribs according to design requirements, adjusting the length of the girder section according to factors such as transportation and hoisting capacity, accurately processing the appearance of a component during manufacturing to ensure reliable welding, and welding a shear nail 5 on a top plate after the girder is manufactured;
secondly, accurately prefabricating the bridge deck 2 according to the structural size in a factory, and reserving prestressed steel beam pipelines and shear grooves 4;
thirdly, according to the specific situation of the position of the bridge, a flat car or other vehicles are adopted to transport the narrow steel box girder 1 to a construction site;
fourthly, after the narrow steel box girder section 1 is transported to a design position, a support is erected below the main girder, after the reliability of the support is ensured, the narrow steel box girder section 1 is hoisted by adopting a truck crane or a crawler crane, and the section steel cross beam 11 between the main girders is welded;
fifthly, hoisting all the prefabricated bridge deck slabs 2, connecting longitudinal steel bars in the welding wet joint 3, and then tensioning all in-vivo longitudinal prestressed steel bundles 6 at one time;
sixthly, pouring the wet joint 3 and C55 compensation shrinkage concrete 5 in the shear groove 4;
seventhly, pouring C50 steel fiber concrete on the bottom plate 10 of the narrow steel box girder 1;
eighthly, after the concrete in the wet joint 3 and the shear groove 4 reach the design strength, the auxiliary implementation installation such as bridge deck pavement is completed.
Nine: tensioning an initial external carbon fiber prestressed cable 12;
ten: and (4) traffic operation, and tensioning the spare external carbon fiber prestressed cable 13 for reinforcement according to the operation condition of the bridge in the later stage.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present invention, features are not necessarily present in isolation, but are interleaved with each other unless explicitly stated or limited. The foregoing shows and describes the principles, essential features, and advantages of the invention. Those skilled in the art should appreciate that the present invention is not limited to the above-described embodiments, and the above-described embodiments and descriptions are only preferred examples of the present invention, and are not intended to limit the present invention to the only choice. The invention may be further modified and optimized within the spirit and scope of the appended claims, all changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (7)
1. The utility model provides a "hysteresis formula" narrow width steel case composite beam which characterized in that: the prefabricated bridge deck slab comprises a narrow steel box girder, a prestressed prefabricated bridge deck slab, a wet joint, an in-vivo longitudinal prestressed steel bundle and a profile steel crossbeam;
prefabricated decking sets up in narrow steel box girder top, be equipped with the shear force groove on the prefabricated decking, narrow steel box girder top is equipped with the shear force nail, the shear force nail inserts in the shear force groove to at the concrete of shear force inslot pouring, prefabricated decking and narrow steel box girder formation rigid connection, form longitudinal connection through wet seam and internal longitudinal prestress steel bundle between the prefabricated decking of prestressing force, stretch-draw is accomplished before concrete placement in wet seam and shear force groove to the internal longitudinal prestress steel bundle of prestressing force prefabricated decking, butt welding formation is connected before the stretch-draw in the wet seam internal longitudinal prestress steel bundle, narrow width steel box girder transversely connects through shaped steel crossbeam.
2. The 'hysteresis type' narrow steel box composite beam as claimed in claim 1, wherein: and C55 is poured in the wet joint and the shear groove to compensate the shrinkage concrete.
3. The 'hysteresis type' narrow steel box composite beam as claimed in claim 1, wherein: the narrow steel box girder is formed by welding a top plate, a web plate and a bottom plate, a top plate stiffening rib and a bottom plate stiffening rib are welded in the narrow steel box girder, bottom plate concrete is arranged on the bottom plate, and shear nails are welded on the top plate.
4. The 'hysteresis type' narrow steel box composite beam as claimed in claim 3, wherein: the bottom plate concrete is C50 steel fiber concrete.
5. The 'hysteresis type' narrow steel box composite beam as claimed in claim 1, wherein: narrow steel case roof beam in be equipped with external carbon fiber prestressed cable, external carbon fiber prestressed cable stretch-draw department sets up the cross slab, sets up the vertical stiffening rib of baffle, manhole on the cross slab and puts more energy into, sets up anchor bedplate and anchor backing plate in anchor department.
6. The 'hysteresis type' narrow steel box composite beam as claimed in claim 5, wherein: the external carbon fiber prestressed cable comprises an initial tensioning external carbon fiber prestressed cable and a standby external carbon fiber prestressed cable.
7. The 'hysteresis type' narrow steel box composite beam as claimed in claim 1, wherein: the construction method comprises the following steps:
step (1): the manufacturing of the narrow steel box girder section is completed in a factory according to the drawing size, the length of the girder section is adjusted according to factors such as transportation and hoisting capacity, the appearance of a component is accurately machined during manufacturing, the welding reliability is ensured, and the shear nails are welded on the top plate after the narrow steel box girder is manufactured;
step (2): a factory accurately prefabricates the bridge deck according to the structure size, and pays attention to the preservation of the prestressed steel beam pipeline and the shear groove;
and (3): transporting the narrow steel box girder to a construction site by adopting a flat car or other vehicles according to the specific situation of the position of the bridge;
and (4): after the beam sections are transported to the designed positions, a support is erected below the main beams, after the reliability of the support is ensured, the narrow steel box beam sections are hoisted by adopting an automobile crane or a crawler crane, and the section steel cross beams between the main beams are welded;
and (5): hoisting all prefabricated bridge decks, connecting longitudinal steel bars in the butt welding wet joint, and tensioning all in-vivo longitudinal prestressed steel bundles at one time;
and (6): c55 compensation shrinkage concrete is poured in the wet joint and the shear groove;
and (7): c50 steel fiber concrete is poured in the narrow steel box girder;
and (8): after the wet joint and the concrete in the shear groove reach the design strength, the auxiliary implementation installation such as bridge deck pavement is completed;
and (9): stretching an initial external carbon fiber prestressed cable;
step (10): and (4) traffic operation, and later stage tensioning the spare external carbon fiber prestressed cable according to the operation condition of the bridge for reinforcement.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114657887A (en) * | 2022-04-18 | 2022-06-24 | 杭州市交通规划设计研究院有限公司 | Construction method of precast slab anti-cracking structure in hogging moment area of combined beam bridge |
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| CN113565005A (en) * | 2021-07-16 | 2021-10-29 | 苏交科集团股份有限公司 | Prefabricated assembled bridge structure with assembled corrugated steel web cantilever and construction method |
| CN113481826A (en) * | 2021-07-21 | 2021-10-08 | 重庆大学 | Prefabricated assembled corrugated steel web combination box girder |
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| CN114657887A (en) * | 2022-04-18 | 2022-06-24 | 杭州市交通规划设计研究院有限公司 | Construction method of precast slab anti-cracking structure in hogging moment area of combined beam bridge |
| CN114657887B (en) * | 2022-04-18 | 2024-04-02 | 杭州市交通规划设计研究院有限公司 | Construction method of prefabricated slab crack-resistant structure in hogging moment area of composite beam bridge |
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