CN109778663A - A kind of lightweight steel-concrete composite beams bridge structure - Google Patents
A kind of lightweight steel-concrete composite beams bridge structure Download PDFInfo
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- CN109778663A CN109778663A CN201910216183.3A CN201910216183A CN109778663A CN 109778663 A CN109778663 A CN 109778663A CN 201910216183 A CN201910216183 A CN 201910216183A CN 109778663 A CN109778663 A CN 109778663A
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Abstract
The invention discloses lightweight steel-concrete composite beams bridge structures, including beam ontology, beam ontology includes top plate and steel member, steel member is connected to below top plate, top plate is UHPC structural member, and suitable bridge along beam ontology hogging moment region in top plate to being arranged several retarded adhesive prestressed steel beams, each retarded adhesive prestressed steel beam includes sheath and the steel strand wires that are located therein, and slow setting adhesive is filled between steel strand wires and sheath.With the lightweight beam bridge structure, UHPC can effectively improve the drag in beam ontology unit area section, retarded adhesive prestressed steel beam is cooperated to reach retarded adhesive prestressed steel beam under equivalent effect power small compared with existing structure diameter, top plate is done thin, to reduce beam ontology sectional dimension, reduce UHPC and amount of reinforcement, so that 15%-30% is effectively reduced in the self weight of beam ontology, the size and the larger reduction of material utilization amount of the substructures such as the beam ontology and support of lightweight, bridge pier, basis, so that entire science of bridge building has extremely strong economy, great popularization.
Description
Technical field
The present invention relates to bridge field, in particular to a kind of lightweight steel-concrete composite beams bridge structure.
Background technique
Steel-concrete composite beams bridge is a kind of new structure pattern to grow up on the basis of steel construction and concrete structure.
It mainly by the way that shear connector (peg, channel steel, curved muscle etc.) is arranged between girder steel and concrete flange plate, resists the two and exists
Starting at interface and Relative sliding make an entirety and work together.Common steel-concrete combination both at home and abroad at present
Beam bridge uses the combination of normal strength concrete slab and steel, for having the steel-concrete composite beams bridge there are hogging moment area, hogging moment area
Common prestress wire is configured, the wider steel-concrete composite beams bridge of direction across bridge laterally can also configure common prestress steel in top plate
Twisted wire.Due to the disadvantages of normal concrete compression and tensile strength is lower, ductility is poor, shrinkage and creep effect is obvious, beam body is caused
Section and thickness are larger, and amount of reinforcement is more；Biggish beam body size and weight lead to the support being adapted to it, bridge pier, base
The size and material utilization amount of the substructures such as plinth must also increase with it, and be both needed to from girder construction self weight and the consideration of engineering globality
Seek a kind of beam of lightweight, mitigates the problem of bridge self weight is designer's urgent need to resolve.
Summary of the invention
It is an object of the invention to overcome the existing steel-concrete composite beams in the presence of the prior art, due to normal concrete
The disadvantages of compression and tensile strength is lower, ductility is poor, shrinkage and creep effect is obvious, causes beam body section and thickness larger, reinforcing bar
Dosage is more, biggish beam size and weight cause the substructures such as the support being adapted to it, bridge pier, basis size and
Material utilization amount also must biggish above-mentioned deficiency therewith, a kind of lightweight steel-concrete composite beams bridge structure is provided.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of lightweight steel-concrete composite beams bridge structure, including beam ontology, the beam ontology include top plate and steel member, described
Steel member is connected to below the top plate, and the top plate is UHPC (Ultra-High Performance Concrete, superelevation
Performance concrete) structural member, to there are the beam ontology in hogging moment region along bridge in the top plate in hogging moment region
Several retarded adhesive prestressed steel beams are set, and each retarded adhesive prestressed steel beam includes that sheath and the steel being located therein twist
Line is filled with slow setting adhesive between the steel strand wires and the sheath.
Wherein, bridge along the retarded adhesive prestressed steel beam from bridge to hogging moment region particular number according to the beam sheet
The specific structure mechanics feature and material parameter of body are determined, or for the full-bridge direction across bridge of the wider beam ontology,
Several retarded adhesive prestressed steel beams are set in the top plate.
Using a kind of lightweight steel-concrete composite beams bridge structure of the present invention, the resistance to compression of UHPC superelevation, tensile strength are good
Good durability and the excellent properties such as toughness and lower Creep Coefficient can effectively improve the anti-of beam ontology unit area section
Power can effectively reduce the plate thickness of top plate, in bridge along bridge to the retarded adhesive prestressed steel beam of hogging moment area configuration of territory, construction and nothing
Binding prestress is identical, flexible arrangement, using single hole anchor device, does not need to wear bellows, does not need to be in the milk, therefore can reach same
Retarded adhesive prestressed steel beam is small compared with existing structure diameter under active force, top plate is done thin, cuts to reduce beam ontology
Face size reduces UHPC and amount of reinforcement, so that 15%-30% is effectively reduced in the self weight of beam ontology, even if UHPC cost is more common
Concrete is expensive, but the size of the substructures such as the beam ontology and support of lightweight, bridge pier, basis and material utilization amount is larger subtracts
It is few, so that entire science of bridge building has extremely strong economy, great popularization.
Preferably, the beam ontology is simply supported beam, and it is described retarded adhesive prestressed that the direction across bridge of the top plate is equipped with several
Steel beam.
Preferably, the beam ontology is continuous beam, the corresponding top plate longitudinal direction hogging moment region in pier top position or full-bridge
The top plate direction across bridge is equipped with several described retarded adhesive prestressed steel beams.
Preferably, the beam ontology is box beam or π type beam.
Preferably, the slow setting adhesive is mortar or adhesive.
Preferably, the different ratio control retarded adhesive prestressed steel beam of the slow setting adhesive solidifies tack time.
Preferably, the material of the sheath is PE (Polyethylene, polyethylene) material.
Preferably, the sheath is in corrugated tube shape.
Preferably, the top plate is thermal curing structural member or steam curing structural member.
Preferably, the diameter of steel strand wires described in each retarded adhesive prestressed steel beam is 10mm-30mm.
Preferably, which can be used in simply supported girder bridge, continuous rigid frame bridge, arch bridge, cable-stayed bridge
With the structures such as the stiff girder of suspension bridge.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
With a kind of lightweight steel-concrete composite beams bridge structure of the present invention, the resistance to compression of UHPC superelevation, tensile strength are good
Good durability and the excellent properties such as toughness and lower Creep Coefficient can effectively improve the anti-of beam ontology unit area section
Power can effectively reduce the plate thickness of top plate, in bridge along bridge to the retarded adhesive prestressed steel beam of hogging moment area configuration of territory, construction and nothing
Binding prestress is identical, flexible arrangement, using single hole anchor device, does not need to wear bellows, does not need to be in the milk, therefore can reach same
Retarded adhesive prestressed steel beam is small compared with existing structure diameter under active force, top plate is done thin, cuts to reduce beam ontology
Face size reduces UHPC and amount of reinforcement, so that 15%-30% is effectively reduced in the self weight of beam ontology, even if UHPC cost is more common
Concrete is expensive, but the size of the substructures such as the beam ontology and support of lightweight, bridge pier, basis and material utilization amount is larger subtracts
It is few, so that entire science of bridge building has extremely strong economy, great popularization.
Detailed description of the invention
Fig. 1 is the hogging moment region section structure diagram of steel-concrete composite beams continuous box girder；
Fig. 2 is the cross-sectional view of existing steel-concrete composite beams A-A in Fig. 1；
Fig. 3 is the cross-sectional view of existing steel-concrete composite beams B-B in Fig. 1；
Fig. 4 is the cross-sectional view of lightweight steel-concrete composite beams bridge structure A-A in Fig. 1 of the present invention a kind of；
Fig. 5 is the cross-sectional view of lightweight steel-concrete composite beams bridge structure B-B in Fig. 1 of the present invention a kind of.
Marked in the figure: 1- beam ontology, 2- top plate, 3- steel member, the retarded adhesive prestressed steel beam of 4-, 5- prestressed strand.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Embodiment
As shown in Figure 1-3, existing steel-concrete composite beams continuous box-beam structure, including beam ontology 1, the beam ontology 1 include top
Plate 2 and steel member 3, the steel member 3 are connected to 2 lower section of top plate, and the top plate 2 is normal concrete C50 structural member,
In be equipped with prestressed strand 5.
Wherein, when making the top plate 2, reserving hole channel is needed, steel beam is penetrated in duct, grout filling duct is opened
Steel beam is drawn to form the prestressed strand 5 in the top plate 2；Since prestressed concrete beam is mainly specification detailing requiments control
It makes, the protective layer thickness between 2 body structure surface of 5 channel surfaces of prestressed strand and the top plate, in 2 structure of top plate
Top surface and side are no less than one times of duct outer diameter, and are not less than 50mm；The top plate 2 is twisted using the steel of φ 13- φ 15.2mm
Line, Ying Caiyong 90mm internal diameter, the metal bellows duct of 97mm outer diameter, since duct outer diameter is greater than 55mm, by code requirement hole
Road clear distance is no less than 0.8 times of duct outer diameter, i.e., described 5 center of prestressed strand takes away from least 1.8 × 97=174.6mm
Spacing 180mm；1.5 × 97=145.5mm of distance structure surface is answered by 5 center line of prestressed strand described in code requirement, thus
Taking 2 minimum thickness of top plate is 300mm.
By bending resistance the moment of inertia calculation formulaIt is found that beam body rigidity mainly determines that plate thickness is to rigidity by deck-siding, deck-molding
Influence very little；If existing steel-concrete composite beams design directlys adopt UHPC, 1 intensity of beam ontology is substantially improved, theoretically can be big
Width reduces UHPC dosage and amount of reinforcement, but due to using traditional rear tension prestress technology, prestressed pore passage and anchorage element
2 construction size of top plate is required strictly, for the smooth lashing for guaranteeing the prestressed strand 5, channel diameter is larger,
To meet specification detailing requiments, 5 spacing of prestressed strand is larger, and causes with 2 structural edge of top plate apart from larger
The increase of 2 thickness of top plate and size, it is little with existing normal concrete structural member difference, optimize the UHPC of the beam ontology 1
And amount of reinforcement is extremely difficult, it is difficult to achieve the purpose that 1 loss of weight of beam ontology.
As shown in Fig. 1,4-5, a kind of lightweight steel-concrete composite beams bridge structure of the present invention, including beam ontology 1, it is described
Beam ontology 1 includes top plate 2 and steel member 3, and the steel member 3 is connected to 2 lower section of top plate, and the top plate 2 is UHPC structure
Part, to there are the beam ontology 1 in hogging moment region along bridge to it is slow that several are arranged in the top plate 2 in hogging moment region
Binding prestress steel beam 4, each retarded adhesive prestressed steel beam 4 include sheath and the steel strand wires being located therein, and the steel twists
Slow setting adhesive is filled between line and the sheath.
Since the retarded adhesive prestressed steel beam 4 is just directly embedded in it when the top plate 2 makes, the top plate 2
Reserving hole channel and grouting, lashing etc. are not needed, thus in the case where reaching equivalent effect power, the retarded adhesive prestressed steel
The diameter of beam 4 is much smaller than the outer diameter 97mm in metal bellows duct, so that 2 thickness of the top plate in the beam ontology 1 is far small
In 300mm.
The diameter of each of each retarded adhesive prestressed steel beam 4 steel strand wires is 28.6mm, outside the sheath
Diameter is 40mm, since the outer diameter sheath is less than 55mm, by the shield of the adjacent retarded adhesive prestressed steel beam 4 of code requirement
Set surface distance is no less than 40mm, i.e., adjacent retarded adhesive prestressed 4 center of steel beam takes away from least 40+40=80mm
Spacing 80mm；Distance structure sealer thickness is not less than 1 times of outer diameter, i.e. 1.5 × 40=60mm, thus takes the top plate 2
Minimum thickness is 120mm.
Continuous beam is combined compared to existing steel more as shown in Figure 2-concrete, it is retarded adhesive prestressed as described in the top plate 2
4 spacing of steel beam reduces, and can suitably increase the number of the retarded adhesive prestressed steel beam 4, as shown in figure 4, each in the present embodiment
Retarded adhesive prestressed steel beam 4 described in 31 beams is set in the top plate 2.
Since two kinds of beam body constructions use homalographic steel beam, stress calculating results are consistent, it was demonstrated that the present invention can replace
Continuous beam is combined for traditional steel-concrete；The lightweight steel-concrete composite beams bridge structure can be used in simply supported girder bridge, continuous rigid frame bridge, arch
The structures such as the stiff girder of bridge, cable-stayed bridge and suspension bridge.
With a kind of lightweight steel-concrete composite beams bridge structure of the present invention, the resistance to compression of UHPC superelevation, tensile strength are good
Good durability and the excellent properties such as toughness and lower Creep Coefficient, can effectively improve 1 unit area section of beam ontology
Drag can effectively reduce the plate thickness of top plate 2, construct along bridge to the retarded adhesive prestressed steel beam 4 of hogging moment area configuration of territory in bridge
Identical as prestressing without bondn, flexible arrangement is not needed to wear bellows, does not need to be in the milk, therefore can reach using single hole anchor device
Retarded adhesive prestressed steel beam 4 is small compared with existing structure diameter under equivalent effect power, top plate 2 is done thin, to reduce beam
1 sectional dimension of ontology reduces UHPC and amount of reinforcement, so that 15%-30% is effectively reduced in the self weight of beam ontology 1, even if UHPC makes
Valence is expensive compared with normal concrete, but the size of the substructures such as the beam ontology 1 and support of lightweight, bridge pier, basis and material are used
Larger reduction is measured, so that entire science of bridge building has extremely strong economy, great popularization.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of lightweight steel-concrete composite beams bridge structure, including beam ontology (1), which is characterized in that the beam ontology (1) includes top
Plate (2) and steel member (3), the steel member (3) are connected to below the top plate (2), and the top plate (2) is UHPC structural member,
To there are the beam ontology (1) in hogging moment region along bridge to several are slow for setting in the top plate (2) in hogging moment region
Binding prestress steel beam (4), each retarded adhesive prestressed steel beam (4) includes sheath and the steel strand wires that are located therein, described
Slow setting adhesive is filled between steel strand wires and the sheath.
2. lightweight steel-concrete composite beams bridge structure according to claim 1, which is characterized in that the beam ontology (1) is freely-supported
The direction across bridge of beam, the top plate (2) is equipped with several described retarded adhesive prestressed steel beams (4).
3. lightweight steel-concrete composite beams bridge structure according to claim 1, which is characterized in that the beam ontology (1) is continuous
Beam, top plate (2) direction across bridge described in the longitudinal hogging moment region of the corresponding top plate (2) in pier top position or full-bridge are equipped with several institutes
State retarded adhesive prestressed steel beam (4).
4. lightweight steel-concrete composite beams bridge structure according to claim 1, which is characterized in that the beam ontology (1) is box beam
Or π type beam.
5. lightweight steel-concrete composite beams bridge structure according to claim 1, which is characterized in that the slow setting adhesive is sand
Slurry or adhesive.
6. lightweight steel-concrete composite beams bridge structure according to claim 1, which is characterized in that the top plate (2) is thermal curing
Structural member or steam curing structural member.
7. lightweight steel-concrete composite beams bridge structure according to claim 1-6, which is characterized in that each described slow
The diameter of steel strand wires described in binding prestress steel beam (4) is 10mm-30mm.
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| CN201910216183.3A CN109778663A (en) | 2019-03-20 | 2019-03-20 | A kind of lightweight steel-concrete composite beams bridge structure |
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