CN109356034A - A kind of mixed composite continuous bridge superstructure system of vertically and horizontally Prestressed CFRP concrete steel - Google Patents
A kind of mixed composite continuous bridge superstructure system of vertically and horizontally Prestressed CFRP concrete steel Download PDFInfo
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- CN109356034A CN109356034A CN201811393513.8A CN201811393513A CN109356034A CN 109356034 A CN109356034 A CN 109356034A CN 201811393513 A CN201811393513 A CN 201811393513A CN 109356034 A CN109356034 A CN 109356034A
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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
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Abstract
The invention discloses a kind of vertically and horizontally Prestressed CFRP concrete steels to mix composite beam bridge superstructure system, longitudinal prestressing CFRP tendons are configured in the concrete slab in the hogging moment region of steel reinforced concrete composite continuous bridge, configure transverse prestress CFRP tendons in the cross-bridges direction of floorings.Due to the addition of CFRP tendons prestress system, so that the concrete slab stress of bridge longitudinal direction hogging moment area and the stress of lateral concrete slab cantilever root are significantly improved；It is more excellent in terms of the performance of bridge durability, the addition of CFRP tendons prestress system and the generation that restrained effectively concrete bridge deck plank split using fiber concrete, it prevents rainwater, atmosphere to the erosion of structural steel and the albefaction aging of concrete, extends the service life of bridge structure；This kind of steel reinforced concrete composite continuous bridge structure be applied widely, factorial construction, construction quality and durability is good, short time limit, has preferable economic benefit and social benefit, is worthy to be popularized.
Description
Technical field
The invention belongs to civil construction fields, and in particular to a kind of mixed composite beam bridge top of vertically and horizontally Prestressed CFRP concrete steel
Structural system.
Background technique
Prestressed concrete beam bridge is bridge structure form widely used in highway in China bridge construction, 50-100 meters across
The big Bridge of diameter mostly uses prestressed concrete beam.Relative to developed country, steel bridge technology development in China's is extremely uneven, a side
Face is grand bridge, bridge high level application；It on the other hand is the application of Material bridge low water-mark and total amount very little.
Because of technology disparate development, China's general concrete bridge there are quality problems more, post-tensioned prestressed beam process
There are the technical bottlenecks such as plug-hole, inaccurate, the mud jacking leakiness of stretch-draw prestressing force control.Prestressed concrete continuous beam concrete box
Web bears biggish principal tensile stress, and concrete material is easy to crack, and the rigidity of structure is caused to reduce, and influences the durability of structure；
And concrete box girder self weight is larger, and under the factors effect such as be self-possessed, creep, mid-span deflection can continue to increase, and seriously affect knot
The bearing capacity of structure reduces the degree of safety of structure, brings very big security risk for bridge.
Engineering circles knowledgeable people is appealing to promote using High strength and high performanc e concrete, using steel-concrete combined structure energetically
Steel construction is sent out with thoroughly changing status of China's engineering structure based on concrete with developed country engineering structure, bridge structure
Exhibition trend is consistent.
Steel concrete combined bridge is widely applied all over the world in medium span bridges.Its major advantage is group
The respective advantage of steel Yu two kinds of materials of concrete can sufficiently and reasonably be played by closing structural bridge, can farthest realize work
Factoryization manufacture reduces execute-in-place, and more guaranteed, steel parts recoverable is cleaned in place, is good for the environment, energy conservation, and
The reliability of economy and construction quality with whole stress.
The advantage of steel concrete combined bridge is: having compared with steel bridge: saving steel；Reduce building height；Impact is reduced,
Endurance；Reduce girder steel corrosion；Reduce noise；It is less etc. to maintain workload.Have compared with concrete bridge: lighter in weight；
Manufacture installation is relatively easy to；Fast, short time limit of speed of application etc..
But situations such as existing generally existing hogging moment area discontinuity of steel reinforced concrete composite beam bridge, concrete slab cracks.
This just illustrates, steel reinforced concrete combined bridge structure is optimized particularly significant.In recent years, CFRP(carbon fibre reinforced composite)
Material is applied to science of bridge building field as a kind of novel bridge material.The CFRP tendons material applied in engineering at present is connected by multiply
It is formed after continuous fiber and resinoid bond by extruding and drawing, its main feature is that it is light high-strength and corrosion-resistant, it can be effective
Substitute the deformed bar in science of bridge building.Steel reinforced concrete composite beam bridge is introduced using CFRP tendons system as prestressed structure, was both mitigated
Dead load, and can significantly improve the excessive tensile stress in hogging moment area.
Environmental protection, energy conservation and realization sustainable development are that the same energy of social economy, resource, environment is made to realize arranging for benign cycle
It applies, is social development and the coordination of natural relation and guarantee.Steel Structure Industry feature: steel building is a kind of novel energy conservation
The building system of environmental protection, is known as " green building " of 21 century.Steel construction is a kind of energy saving and environment friendly, building of being recycled
Building structure meets the requirement for developing energy saving building and economic sustainable and healthy development.
China is big steel country again, in due course development Bridges in Our Country steel construction, changes what China's concrete-bridge occupied the majority
Status is just able to achieve sustainable development.The steel and concrete structure more optimized is designed, is not only had to the development of civil engineering huge
Meaning, and tremendous influence is generated to the industrial structure, national economy.
Summary of the invention
To solve the above problems, the invention discloses a kind of vertically and horizontally Prestressed CFRP concrete steels to mix composite beam bridge superstructure
System, and the matching operation scheme of complete set is provided for the structural system.So-called composite structure, i.e., in armored concrete knot
The fifth-largest class formation form after structure, prestressed reinforced concrete construction, steel construction and masonry concrete structure.Composite structure is logical
Often refer on member cross-sections by different combinations of materials and the structure of the common stress of energy.Research data shows CFRP material not
Only mechanical property with higher, and there is preferable corrosion resistance.Using on carbon fibre composite substitution ordinary meaning
Prestressed strand, not only improve the overall mechanical properties of material, can also effectively extend bridge service life.The present invention
In bridge intermediate support negative moment area add bridge longitudinal direction CFRP tendons, be in conjunction with steel-concrete combined structure design theoretical principle with
The existing practical disease of steel-concrete combined structure holder top concrete cracking and the new structure proposed.
In order to achieve the above objectives, technical scheme is as follows:
A kind of mixed composite beam bridge superstructure system of vertically and horizontally Prestressed CFRP concrete steel, combines contour continuous bridge using steel reinforced concrete
Arrangement form, the every superstructure of beam bridge are the lateral prefabricated bridge of contour double steel I-beams and upper part, are adopted therebetween
It is worked together with WELDING STUDS with rear pouring concrete；Its middle girder uses Q345D work using duplexing word steel plate combination beam, steel girder
The straight web steel beam of font reinforces lateral ties using crossbeam between double girders, and span centre crossbeam is needle beam, close to fulcrum end floor beam
To reinforce needle beam, fulcrum end floor beam is cross bearer, and steel girder and beam welding are connected as integrin girder steel；The floorings are pre-
Making sheet block is spliced, longitudinal using the wet seam connection of BFRP fiber concrete, laterally uses overall with prefabricated, sets inside floorings
Set vertically and horizontally CFRP presstressed reinforcing steel, floorings and girder steel top flange plate contact position reserving hole, on the girder steel at hole post-cast strip
WELDING STUDS is set at the edge of a wing, and the wet seam BFRP fiber concrete of after-pouring connect concrete slab with girder steel.
Floorings transverse prestress uses the CFRP tendons of 4 φ 10, is reserved with direction across bridge CFRP tendons in monolithic prefabricated bridge
Duct is to arrange direction across bridge floorings prestressing tendon, alternating one-end tension, control stress under anchor 1395MPa.
Anchorage uses the flat anchor of special arc, and anchor hole is distributed in circular arc.
Floorings longitudinal direction CFRP presstressed reinforcing steel arrangement are as follows: in suitable bridge to about support, direction across bridge closes middle support presstressed reinforcing steel
In steel girder positional symmetry arrange, be symmetrically arranged around every every 3 middle supports length be 6 times of prefabricated boards it is wide, 4 times
The CFRP tendons that prefabricated board is wide, 2 times of prefabricated boards are wide, CFRP beam center spacing is not less than 180mm, wherein close to first beam of girder steel
Centre distance steel girder center 400-600mm, the setting of guardrails of both sides inside is through the Prestressed CFRP beam joined entirely.
Floorings pre-erection uses the low slump concrete of 6~10cm, and high-performance is shunk using C50 compensation in cast-in-place part
BFRP fiber concrete.
The beneficial effects of the invention are as follows
1, mechanical characteristic is good, the addition of CFRP tendons prestress system so that bridge longitudinal direction hogging moment area concrete slab stress
And the stress of lateral concrete slab cantilever root is significantly improved；
2, more excellent in terms of the performance of durability, the addition of CFRP tendons prestress system restrained effectively concrete bridge deck
The generation of plank split prevents rainwater, atmosphere to the erosion of structural steel and the albefaction aging of concrete, extends making for bridge
Use the service life；
3, using prefabricated assembled form of construction work, the mass ratio field fabrication quality of component production is secure, and speed of application is significantly
Accelerate, construction precision is higher.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is CFRP presstressed reinforcing steel layout drawing in bridge longitudinal direction of the present invention；
Fig. 3 is bridge lateral CFRP presstressed reinforcing steel layout drawing of the present invention；
Fig. 4 is bridge typical case cross-sectional view of the present invention；
Fig. 5 is bridge floor plate design drawing of the present invention；
Fig. 6 is that bridge shear of the present invention follows closely layout drawing.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the invention.
The longitudinal direction of novel longitudinal transverse prestress CFRP tendons steel reinforced concrete composite continuous bridge superstructure system of the present invention
Prestressed CFRP muscle arrangement is as shown in Fig. 2；Transverse prestress CFRP tendons arrangement is as shown in Fig. 3；Typical cross section such as attached drawing 4
It is shown；Floorings design is as shown in Fig. 5；WELDING STUDS arrangement is as shown in Fig. 6.
The present invention provides a kind of vertically and horizontally rib prestressed steel reinforced concrete composite continuous bridge superstructure system of Prestressed CFRP,
So-called composite structure, i.e., after reinforced concrete structure, prestressed reinforced concrete construction, steel construction and masonry concrete structure
The fifth-largest class formation form.Composite structure is often referred on member cross-sections by different combination of materials and can common stress
Structure, the present invention are exactly that steel reinforced concrete is used to combine contour continuous bridge arrangement form, and the every superstructure of bridge is contour duplexing word
The lateral prefabricated bridge of girder steel and upper part, floorings inside is equipped with vertical and horizontal CFRP presstressed reinforcing steel, so that bridge is longitudinal
The concrete slab stress of hogging moment area and the stress of lateral concrete slab cantilever root are significantly improved；
Durability is more preferable, extends the service life of bridge.
A kind of mixed composite continuous bridge superstructure system of vertically and horizontally Prestressed CFRP concrete steel, combines contour company using steel reinforced concrete
Continuous beam bridge arrangement form, the every superstructure of bridge are the lateral prefabricated bridge of contour double steel I-beams and upper part, the two
Between worked together using WELDING STUDS with rear pouring concrete.
Main beam design
For girder using duplexing word steel plate combination beam, steel girder uses the I-shaped straight web steel beam of Q345D, uses cross between double girders
Beam reinforces lateral ties, and span centre crossbeam is needle beam, is to reinforce needle beam close to fulcrum end floor beam, fulcrum end floor beam is cross bearer
(section of beam preferably uses I-shaped cross-section, and rigidity is successively reinforced).Using being welded to connect between steel girder and crossbeam, often across steel
Beam integral lifting after the completion of ground welding, the girder steel lifted with the connection are welded as integrin girder steel.
Floorings design
(1) prefabricated bridge uses polypropylene fiber concrete, longitudinal using the wet seam connection of BFRP fiber concrete, laterally adopts
It is prefabricated with overall with, and transverse CFRP presstressed reinforcing steel is set, improve floorings stress.Floorings and girder steel top flange plate contact position are pre-
It boxes out hole, WELDING STUDS is set at the girder steel top flange at hole post-cast strip, the wet seam BFRP fiber concrete of after-pouring makes bridge
Panel is connect with girder steel.
(2) floorings are prefabricated according to rectangle, and the floorings horizontal alignment in curve passes through the wet joint gap of medial and lateral
It is adjusted, to meet different route center curvature of a curve requirements.
(3) floorings pre-erection uses the low slump polypropylene fiber concrete of 6~10cm, and cast-in-place part uses C50
High-performance BFRP fiber concrete is shunk in compensation.
(4) floorings transverse prestress uses the CFRP tendons of 4 φ 10, in conjunction with prefabricated bridge width along suitable bridge to certain
Spacing arranges (post-cast strip aperture is avoided in attention), alternately one-end tension, control stress under anchor 1395MPa.Anchorage is using extraordinary
The flat anchor of arc, anchor hole are distributed in circular arc, improve the stress distribution of structure, reduce prestressed friction loss.
Prestress system
Using this example vertically and horizontally CFRP tendons construction pre-stress system, direction across bridge CFRP tendons duct is reserved in monolithic prefabricated bridge
To arrange direction across bridge floorings prestressing tendon, which can be effectively improved floorings itself stress, reduce
The bending normal stresses of floorings span centre and cantilever root position, and it is able to suppress the bridge floor deformation during bridge operation.
Longitudinal CFRP presstressed reinforcing steel arrangement are as follows: central bearing point presstressed reinforcing steel is in suitable bridge to about support, and direction across bridge is about steel master
Beam positional symmetry arrangement, be symmetrically arranged around every central bearing point length be 6 times of prefabricated boards are wide, 4 times of prefabricated boards are wide, 2
Times prefabricated board is wide, and CFRP beam center spacing is not preferably less than 180mm, wherein in first beam center distance steel girder of girder steel
The suitable value 400-600mm of the heart.Through the Prestressed CFRP beam joined entirely, branch points out top longitudinal prestressing for setting inside guardrails of both sides
Design starting point be solve the problems, such as concrete cracking at common steel reinforced concrete composite continuous bridge position, and cracking after rain
Endurance issues brought by water erosion reinforcing bar and girder steel, the longitudinal prestressing system are efficiently solved from structure stress mechanism
The problem.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.
Claims (5)
1. a kind of vertically and horizontally Prestressed CFRP concrete steel mixes composite continuous bridge superstructure system, it is characterised in that: use steel reinforced concrete
High across the four-span continuous beams beam bridge arrangement forms such as combination, the every superstructure of beam bridge are the cross of contour double steel I-beams and upper part
To prefabricated bridge, high-performance BFRP fiber concrete is poured with after using WELDING STUDS therebetween to work together；Its middle girder
Using duplexing word steel plate combination beam, steel girder uses the I-shaped straight web steel beam of Q345D, is reinforced between double girders using crossbeam horizontal
To connection, span centre crossbeam is needle beam, is to reinforce needle beam close to fulcrum end floor beam, fulcrum end floor beam is cross bearer, steel girder
It is connect with beam welding；The floorings are spliced for prefabricated chunk, longitudinal to be connected using the wet seam of BFRP fiber concrete,
It is laterally prefabricated using overall with, vertically and horizontally CFRP presstressed reinforcing steel, floorings and girder steel top flange plate contact position are set inside floorings
WELDING STUDS is arranged at the girder steel top flange at hole post-cast strip in reserving hole, and after-pouring BFRP fiber concrete makes concrete
Floorings are connect with girder steel.
2. a kind of vertically and horizontally Prestressed CFRP concrete steel according to claim 1 mixes composite continuous bridge superstructure system,
It is characterized by: the floorings transverse prestress uses the CFRP tendons of 4 φ 10, direction across bridge is reserved in monolithic prefabricated bridge
CFRP tendons duct is to arrange direction across bridge floorings prestressing tendon, alternating one-end tension, control stress under anchor 1395MPa.
3. a kind of vertically and horizontally Prestressed CFRP concrete steel according to claim 1 mixes composite continuous bridge superstructure system,
It is characterized by: the anchorage uses the special flat anchor of arc in view of the material property of CFRP tendons and the thickness of floorings,
Anchor hole is distributed in circular arc.
4. a kind of vertically and horizontally Prestressed CFRP concrete steel according to claim 1 mixes composite continuous bridge superstructure system,
It is characterized by: the floorings longitudinal direction CFRP presstressed reinforcing steel arrangement are as follows: central bearing point presstressed reinforcing steel is in suitable bridge to about support, cross
Bridge to about steel girder positional symmetry arrange, be symmetrically arranged around every central bearing point length be 6 times of prefabricated boards it is wide, 4
Times prefabricated board is wide, 2 times of prefabricated boards are wide, and CFRP beam center spacing is not less than 180mm, wherein close to girder steel first beam center away from
From steel girder center 400-600mm.
5. a kind of vertically and horizontally Prestressed CFRP concrete steel according to claim 1 mixes composite continuous bridge superstructure system,
It is characterized by: the floorings pre-erection uses the low slump polypropylene fiber concrete of 6~10cm, cast-in-place part is used
High-performance BFRP fiber concrete is shunk in C50 compensation.
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| CN201811393513.8A CN109356034A (en) | 2018-11-21 | 2018-11-21 | A kind of mixed composite continuous bridge superstructure system of vertically and horizontally Prestressed CFRP concrete steel |
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| CN201811393513.8A CN109356034A (en) | 2018-11-21 | 2018-11-21 | A kind of mixed composite continuous bridge superstructure system of vertically and horizontally Prestressed CFRP concrete steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110983968A (en) * | 2019-12-30 | 2020-04-10 | 扬州大学 | Prefabricated assembled FRP (fiber reinforced plastic) -section steel-concrete combined bridge deck and construction method thereof |
| CN111472258A (en) * | 2020-04-01 | 2020-07-31 | 武汉理工大学 | Large-span suspension bridge GFRP rib precast slab combined beam bridge deck system and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983968A (en) * | 2019-12-30 | 2020-04-10 | 扬州大学 | Prefabricated assembled FRP (fiber reinforced plastic) -section steel-concrete combined bridge deck and construction method thereof |
| CN111472258A (en) * | 2020-04-01 | 2020-07-31 | 武汉理工大学 | Large-span suspension bridge GFRP rib precast slab combined beam bridge deck system and construction method thereof |
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Application publication date: 20190219 |