CN108867319A - A kind of steel-UHPC combination beam and construction method for cable-stayed bridge - Google Patents
A kind of steel-UHPC combination beam and construction method for cable-stayed bridge Download PDFInfo
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- CN108867319A CN108867319A CN201810643256.2A CN201810643256A CN108867319A CN 108867319 A CN108867319 A CN 108867319A CN 201810643256 A CN201810643256 A CN 201810643256A CN 108867319 A CN108867319 A CN 108867319A
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
A kind of steel-UHPC combination beam for cable-stayed bridge, the main longitudinal grider being arranged in parallel including two, two or more the crossbeams being connected with main longitudinal grider, and two pieces or more UHPC prefabricated boards, each crossbeam is evenly arranged in along longitudinal direction between two main longitudinal griders, it is connected in the middle part of adjacent two crossbeams by intermediate longitudinal girder, main longitudinal grider, intermediate longitudinal girder and adjacent two beam engagements form girder steel lattice, prefabricated board is erected on girder steel lattice, main longitudinal grider and intermediate longitudinal girder are equipped with longitudinal UHPC cast-in-site stripe, crossbeam is equipped with lateral UHPC cast-in-site stripe, cast-in-site stripe reinforcing bar and shear key are equipped in each cast-in-site stripe, prefabricated board reinforcing bar is equipped in prefabricated board, it is outer and connected with corresponding cast-in-site stripe reinforcing bar that prefabricated board reinforcing bar both ends extend out to prefabricated board, shear key is connected with corresponding girder steel.A kind of construction method of said combination beam, including steel member and prefabricated board processing and etc..Inventive energy is good, low cost, execution conditions are adaptable, is conducive to cable-stayed bridge develops towards more Long span.
Description
Technical field
The present invention relates to technical field of bridge engineering more particularly to a kind of steel-UHPC combination beam for cable-stayed bridge and apply
Work method.
Background technique
Cable-stayed bridge is a kind of rope supporting system bridge, i.e., on Sarasota with several oblique drag-lines supported girder with across compared with
The obstacles such as big river valley.Drag-line plays the role of multiple spot elastic bearing to girder, greatly reduces moment of flexure and beam body size in beam, across
More ability significantly increases.The wind resisting stability of cable-stayed bridge is better than suspension bridge, and landscape effect is preferable, and construction technology is mature, cost warp
Ji, has good applicability for the across footpath of 300~1000m, is the main bridge type that Longspan Bridge uses.
Cable-stayed bridge main-beam not only needs to undertake the moment of flexure because of the generation of the bridge floors load such as self weight, automobile and affiliated facility and cuts
Power, while also to undertake axial compressive force caused by horizontal component force of stayed cable.Have at present using more cable-stayed bridge main-beam form mixed
Solidifying Tu Liang, girder steel, steel-mix combination beam and steel-mixes hybrid beam (mid-span steel girder, end bay beams of concrete).Concrete girder self weight
It is larger, it creeps in autogenous shrinkage and under the action of external loads, the diseases such as cracking is easy to produce during operation, under normal conditions only
Suitable for the lesser cable-stayed bridge (400m or less) of across footpath.Girder steel self weight it is lighter, suitable for compared with Long span cable-stayed bridge (600m with
On), but its cost is often costly, and common Orthotropic steel plate bridge floor easily occurs under wheel load effect
The disease of fatigue cracking and deck paving breakage, it is difficult to eradicate.Steel-mixes the spy that combination beam takes into account steel tension, concrete anti-compression
Point, both avoided beams of concrete be self-possessed it is excessive lead to suspension cable, Sarasota and its excessively high problem of foundation cost, also avoid simultaneously
The problem of pure steel structure girder cost is excessively high, bridge floor fatiguability destroys, superior technical and economic performance is highly suitable for across footpath
The cable-stayed bridge of 400~600m.But the floorings that traditional steel-mixes combination beam generally use C60 concrete, bridge floor plate thickness one
As larger (26~30cm) so that steel-mixes combination beam and is self-possessed compared with girder steel still larger thus cause suspension cable specification, Sarasota
Larger reduces its economy, limits its application in the more large span stayed-cable bridge a possibility that.
With the development of bridge technology, UHPC (Ultra-High Performance Concrete, very-high performance coagulation
Soil) selection that is possibly realized of material.UHPC tension, compression strength are high, and cracking resistance is good, not only can be effective as bridge floor plate material
Improve the stress performance and durability of floorings, but also the thickness of floorings can be greatly reduced to significantly mitigate combination beam certainly
Weight enables combination girder stayed-cable bridge to develop towards more Long span (600m or more).Flat box-shaped steel-UHPC combination beam must be whole
Body lifting construction is unfavorable for applying under the poor environment in mountain area and other execution conditions.In addition, the power of the wet seam of UHPC material
Learning performance is to influence the key factor of its application, and traditional rectangular slits mechanical property and cracking resistance are unable to satisfy requirement.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide that a kind of performance is good, low cost, construction
Condition is adaptable, be conducive to cable-stayed bridge towards more Long span develop steel-UHPC combination beam and construction method.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of steel-UHPC combination beam for cable-stayed bridge above is indulged including two main longitudinal griders being arranged in parallel, two with main
The connected crossbeam of beam and two pieces or more UHPC prefabricated board, each crossbeam are evenly arranged in two main longitudinal griders along longitudinal direction
Between, it is connected in the middle part of adjacent two crossbeams by intermediate longitudinal girder, the main longitudinal grider, intermediate longitudinal girder and adjacent two crossbeams
Girder steel lattice are cooperatively formed, each prefabricated board is erected on correspondingly on each girder steel lattice, and the main longitudinal grider is equipped with
The main longitudinal cast-in-site stripe of UHPC, the intermediate longitudinal girder are equipped with longitudinal cast-in-site stripe among UHPC, and it is lateral that the crossbeam is equipped with UHPC
Cast-in-site stripe is equipped with cast-in-site stripe reinforcing bar and shearing in main longitudinal cast-in-site stripe, intermediate longitudinal cast-in-site stripe and lateral cast-in-site stripe
Part, the prefabricated board is interior to be equipped with along longitudinal direction with the prefabricated board reinforcing bar of lateral arrangement, and each prefabricated board reinforcing bar both ends extend out to institute
It states outside prefabricated board and is connected with corresponding cast-in-site stripe reinforcing bar, shear key and the main longitudinal grider phase in main longitudinal cast-in-site stripe
Even, the shear key in the intermediate longitudinal cast-in-site stripe is connected with the intermediate longitudinal girder, shear key in the lateral cast-in-site stripe and
The crossbeam is connected.
As a further improvement of the above technical scheme：The edge on the prefabricated board top is recessed, and the main longitudinal direction is cast-in-place
Band, intermediate longitudinal cast-in-site stripe and the lateral cast-in-site stripe top all extend to above corresponding lower recess.UHPC material is wet
The mechanical property of seam is to influence the key factor of its application, and thus wet seam is further used ladder-like seam by the present invention,
There is higher mechanical property and cracking resistance than traditional rectangular slits, provide longitudinal tensile capacity, wet seam by horizontal shear
It can achieve performance more higher than base material, efficiently solve the problems, such as this.
As a further improvement of the above technical scheme：The prefabricated board and the faying face of main longitudinal cast-in-site stripe are saw
The flank of tooth, can make prefabricated board share suspension cable pass to main longitudinal grider pressure ability it is stronger；Prefabricated board and intermediate longitudinal cast-in-site stripe, cross
To the faying face of cast-in-site stripe using conventional plane.
As a further improvement of the above technical scheme：Rubber pad is equipped between the prefabricated board and the girder steel lattice.If
It sets the avoidable prefabricated board of rubber pad directly to contact with girder steel lattice, causes girder steel lattice damaged surfaces, while being also beneficial to improve prefabricated
Plate is laid on the stability on girder steel lattice, prevents concrete grout runaway when being poured each cast-in-site stripe.
As a further improvement of the above technical scheme：The position thickness that the prefabricated board lower part is contacted with the girder steel lattice
It increases, is conducive to the stress performance for improving prefabricated board itself.
As a further improvement of the above technical scheme：The main longitudinal grider uses I-shaped section, and main longitudinal grider includes main vertical
Back plate, main longitudinal grider web and main longitudinal grider bottom plate, the main longitudinal grider top plate are connected with the shear key, the main longitudinal grider web
Outside is welded with muti-piece longitudinal direction stiffened steel plates, and longitudinal direction stiffened steel plates described in muti-piece are vertically evenly arranged, the main longitudinal grider top plate
Between longitudinal stiffened steel plates of top side, between adjacent two longitudinal stiffened steel plates and described in lower side
Outer lateral stiffening steel plate, welding on the inside of the main longitudinal grider web are welded between longitudinal stiffened steel plates and the main longitudinal grider bottom plate
There is interior lateral stiffening steel plate.The main longitudinal grider structure of this kind of structure is simple, reliable, has biggish bending stiffness, local stability
By force, it is able to bear axial compressive force caused by biggish moment of flexure and horizontal component force of stayed cable.
As a further improvement of the above technical scheme：The crossbeam use I-shaped type end side, crossbeam include crossbeam top plate,
Cantilever diaphragm and crossbeam bottom plate, the crossbeam top plate are connected with the shear key, and horizontal add is welded on the cantilever diaphragm
Strength steel plate and the vertical stiffened steel plates of muti-piece, vertical stiffened steel plates described in muti-piece are transversely evenly arranged, the cantilever diaphragm with
It is provided with splicing steel plate between the interior lateral stiffening steel plate, between the splicing steel plate and the cantilever diaphragm and splices
It is connected respectively by high-strength bolt between steel plate and the interior lateral stiffening steel plate.Crossbeam is mainly used to provide branch for floorings
Support, and bridge floor load is transferred on main longitudinal grider, the beam structure of this kind of structure is simple, reliable, and the local stability of itself is strong.
As a further improvement of the above technical scheme：The intermediate longitudinal girder uses I-shaped section, and intermediate longitudinal girder includes
Intermediate longitudinal girder top plate, intermediate longitudinal girder web and intermediate longitudinal girder bottom plate, intermediate longitudinal girder top plate are connected with the shear key, it is described in
Between the vertical dimension of longitudinal-beam web plate be less than the vertical dimension of the main longitudinal grider web, in the middle part of the intermediate longitudinal girder web and crossbeam
It is connected between the vertical stiffened steel plates by high-strength bolt.Intermediate longitudinal girder is mainly used to laterally separated floorings, reduces bridge floor
The hoisting weight of plate, while the also template as intermediate longitudinal cast-in-site stripe.
A kind of construction method of the above-mentioned steel-UHPC combination beam for cable-stayed bridge, includes the following steps：
S1：Each steel member and prefabricated board processing：Segmental machining manufactures main longitudinal grider, crossbeam and intermediate longitudinal girder, and in main longitudinal grider
Upper installation anchor tie plate, installs shear key on main longitudinal grider, crossbeam and intermediate longitudinal girder, carries out anti-corrosion painting on each steel member surface
Dress；According to the design size installation template of UHPC prefabricated board, prefabricated board reinforcing bar is bound, and the prefabricated board reinforcing bar both ends configured need to stretch
It out to other than the template of prefabricated board, pours ultra-high performance concrete and is conserved, demould storage after reaching design strength；
S2：Walked loop wheel machine using bridge floor, the piecewise cantilever of bridge location respectively assembled main longitudinal grider, crossbeam and intermediate longitudinal girder to form steel
Liang Ge, installation suspension cable are anchored on anchor tie plate and carry out first time tensioning；
S3：Using bridge floor walking loop wheel machine, lifting installation prefabricated board, prefabricated board is arranged on girder steel lattice paragraph by paragraph；
S4：Pour each cast-in-site stripe：Bind the cast-in-site stripe of main longitudinal cast-in-site stripe, intermediate longitudinal cast-in-site stripe and lateral cast-in-site stripe
Reinforcing bar, and the prefabricated board reinforcing bar stretched out in corresponding cast-in-site stripe reinforcing bar and prefabricated board is interconnected, it is poured each cast-in-site stripe superelevation
It is integral that performance concrete connect each prefabricated board with girder steel lattice；
S5：Each cast-in-site stripe is conserved, second of tensioning is carried out to suspension cable after reaching design strength；
S6：Circulation carries out step S2 to S5, until full-bridge joins the two sections of a bridge, etc；
S7：Wearing course is overlayed on bridge floor and is conserved, and construction is completed.
As a further improvement of the above technical scheme：In step S1, to the ultra-high performance concrete prefabricated board poured into
Row steam curing, demoulding resting period are no less than two months；It is cast-in-place to each ultra-high performance concrete poured in step S5 to bring into
Row steam curing.Using high temperature steam curing, and after demoulding the resting period be no less than two months, can utmostly reduce UHPC
Adverse effect of the floorings shrinkage and creep to main beam structure.
Compared with the prior art, the advantages of the present invention are as follows：Steel-UHPC disclosed by the invention for cable-stayed bridge is combined
Beam, main longitudinal grider, two longitudinally adjacent crossbeams and intermediate longitudinal girder overlap to form girder steel lattice, using UHPC prefabricated board as bridge floor
Plate is simultaneously layed on girder steel lattice, is connect by the prefabricated board reinforcing bar in prefabricated board with the cast-in-site stripe reinforcing bar in cast-in-site stripe, is realized pre-
The connection of making sheet and each cast-in-site stripe realizes the connection between cast-in-site stripe and each girder steel by the shear key being arranged on each girder steel, from
And floorings and girder steel lattice are connected as entirety, it ensure that the switching performance and holistic resistant behavior of girder；And girder steel lattice can be with
Using girder steel lattice integral hoisting, bridge location assembly can also be used, compensating for flat box-shaped steel-UHPC combination beam must be whole
The deficiency of lifting construction is conducive to apply under the poor environment in mountain area and other execution conditions；Intermediate longitudinal girder is lateral by bridge floor
It is divided into two parts, reduces the hoisting weight of prefabricated board, reduce difficulty of construction, while intermediate longitudinal cast-in-site stripe can also be acted on
Template；UHPC bridge floor plate thickness can be reduced to 17cm, compared to the plate thickness that concrete slab can reduce by 40%, prefabricated board lifting
Weight mitigates significantly, reduces lifting construction difficulty, while entire girder self weight is also greatly reduced, and then can reduce oblique pull
Rope specification and Sarasota size, anti-seismic performance is good, saves project cost, moreover it is possible to make to combine girder stayed-cable bridge towards the development of more Long span；
UHPC floorings tension, cracking resistance are superior, and durability is very good, and floorings can be met by being not required to setting prestressed strand
Crack resistance requirement, so that girder is constructed and is constructed becomes more simple；UHPC floorings later period shrinkage and creep is smaller, can not only have
Effect ground reduces problem of Cracking caused by concrete slab shrinkage and creep, and can also greatly shorten the prefabricated board resting period, contracts
Casual labourer's phase；UHPC bridge floor panel stiffness is larger, and fatigue behaviour is good, and strong with the associativity of deck paving, it is possible to prevente effectively from orthogonal
Fatigue cracking that anisotropic slab bridge floor is easy to appear and breakage of mating formation, reduce bridge maintenance difficulty and life cycle management at
This.
Construction method disclosed by the invention, difficulty of construction is low, and the period is short, and girder steel lattice use bridge location assembly, compensates for
The deficiency of the necessary integral hoisting construction of flat box-shaped steel-UHPC combination beam, is conducive to poor in mountain area and other execution conditions
It is applied under environment.
Detailed description of the invention
Fig. 1 is overlooking structure diagram of the present invention for the steel-UHPC combination beam of cable-stayed bridge.
Fig. 2 is the A-A view in Fig. 1.
Fig. 3 is the B-B view in Fig. 1.
Fig. 4 is the structural schematic diagram of main longitudinal cast-in-site stripe in the present invention.
Fig. 5 is the structural schematic diagram of intermediate longitudinal cast-in-site stripe in the present invention.
Fig. 6 is the structural schematic diagram of the lateral cast-in-site stripe in the present invention.
Fig. 7 is the structural schematic diagram of the anchor tie plate in the present invention.
Each label indicates in figure：1, intermediate longitudinal girder；2, main longitudinal grider；3, prefabricated board；4, crossbeam；5, main longitudinal cast-in-site stripe；6,
Intermediate longitudinal direction cast-in-site stripe；7, lateral cast-in-site stripe；8, cast-in-site stripe reinforcing bar；9, shear key；10, prefabricated board reinforcing bar；11, rubber pad；12,
Main longitudinal grider top plate；13, main longitudinal grider web；14, main longitudinal grider bottom plate；15, longitudinal stiffened steel plates；16, outer lateral stiffening steel plate；17,
Interior lateral stiffening steel plate；18, crossbeam top plate；19, cantilever diaphragm；20, crossbeam bottom plate；21, sash steel plate；22, vertical to add
Strength steel plate；23, splice steel plate；24, high-strength bolt；25, intermediate longitudinal girder top plate；26, intermediate longitudinal girder web；27, intermediate longitudinal girder bottom
Plate；28, anchor tie plate；29, anchor tie plate stiffened steel plates；30, main longitudinal grider anchor draws stiffened steel plates.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, invention is further described in detail.
Fig. 1 to Fig. 7 shows a kind of embodiment of the invention, the steel-UHPC combination beam for cable-stayed bridge of the present embodiment,
Main longitudinal grider 2 has twice, is arranged in parallel in two sides, on main longitudinal grider 2 based on longitudinal cast-in-site stripe 5；Intermediate longitudinal girder 1 has together, is arranged in
Among twice main longitudinal grider 2, bridge floor direction across bridge is halved, is intermediate longitudinal cast-in-site stripe 6 on intermediate longitudinal girder 1；It is laterally on crossbeam 4
Cast-in-site stripe 7.10mm thickness rubber pad 11 is set in the rectangular grid top surface that main longitudinal grider 2, intermediate longitudinal girder 1, crossbeam 4 surround, UHPC is prefabricated
Plate 3 is shelved thereon, is connect by each cast-in-site stripe, shear key 9 with girder steel lattice integral.
The main longitudinal grider 2 of girder steel lattice is I-shape cross section, by main longitudinal grider top plate 12, main longitudinal grider web 13, main longitudinal grider bottom plate 14
It constitutes, main longitudinal grider 2 is 2960mm high (or size of vertical direction), wherein 12 width 900mm of main longitudinal grider top plate, thickness 40mm；It is main vertical
Web 13 is 2840mm high, thickness 32mm；14 width 1000mm of main longitudinal grider bottom plate, thickness 80mm.To enhance main longitudinal grider top plate 12, main longitudinal grider
13 outside of local stability main longitudinal grider web of web 13 and main longitudinal grider bottom plate 14 is vertically equidistantly welded with three pieces of longitudinal directions and puts more energy into
Steel plate 15, between adjacent two pieces of longitudinal stiffened steel plates 15, between main longitudinal grider top plate 12 and longitudinal stiffened steel plates 15 of the top, with
And outer lateral stiffening steel plate 16, main longitudinal grider web are welded between main longitudinal grider bottom plate 14 and longitudinal stiffened steel plates 15 of bottom
13 insides are welded with interior lateral stiffening steel plate 17.Intermediate longitudinal girder 1 is the lesser I-steel component of height, and the high 370mm in section is main
It is used for the effect of direction across bridge segmentation floorings, to reduce the lifting weight of prefabricated board 3, while as intermediate longitudinal cast-in-site stripe 6
Template.Prefabricated board 3 uses ultra-high performance concrete containing steel fibre, inside sets the prefabricated board reinforcing bar 10 of vertical and horizontal, prefabricated board
Reinforcing bar 10 uses regular reinforcement.It is boundary with intermediate longitudinal girder 1,3 direction across bridge of UHPC prefabricated board is divided into two pieces, and monolithic prefabricated board 3 is long
12980mm, width 3000mm, standard thickness 170mm, the position office that prefabricated board 3 is contacted with main longitudinal grider 2, intermediate longitudinal girder 1 and crossbeam 4
Portion is thickeied to 230mm, and 10mm thickness rubber pad 11 is arranged between prefabricated board 3 and girder steel lattice top surface.It is provided in 2 top surface of main longitudinal grider
The main longitudinal cast-in-site stripe 5 of UHPC is provided among UHPC longitudinal cast-in-site stripe 6 in 1 top surface of intermediate longitudinal girder, by be welded on main longitudinal grider 2,
The shear key 9 of 1 top surface of intermediate longitudinal girder is connect with main longitudinal grider 2, intermediate longitudinal girder 1.Wherein, shear key 9 preferably uses WELDING STUDS；It is main vertical
To cast-in-site stripe 5, intermediate longitudinal 6 bottom of cast-in-site stripe difference width 820mm and 400mm, thickness is 240mm, main longitudinal direction cast-in-site stripe 5,
Cast-in-site stripe reinforcing bar 8 is set in intermediate longitudinal direction cast-in-site stripe 6, cast-in-site stripe reinforcing bar 8 uses regular reinforcement.
4 height of crossbeam of girder steel lattice is slightly less than 2 height of main longitudinal grider, I-shape cross section is also used, by crossbeam top plate 18, crossbeam
Web 19, crossbeam bottom plate 20 are constituted, centerline deck-molding 2760mm, middle cross beam top plate 18, crossbeam bottom plate 20 width 600mm,
Thick 24mm；19 thickness 14mm of cantilever diaphragm.For the local stability for ensuring cantilever diaphragm 19, weld horizontal is put more energy into steel on cantilever diaphragm 19
Plate 21 and the vertical stiffened steel plates 22 of muti-piece, the vertical stiffened steel plates 22 of muti-piece are transversely evenly arranged.4 end of crossbeam passes through splicing steel
Plate 23 and high-strength bolt 24 are connected with the interior lateral stiffening steel plate 17 of main longitudinal grider 2, and the vertical stiffened steel plates 22 at 4 middle part of crossbeam are in
Between the intermediate longitudinal girder web 26 of stringer 1 spliced by high-strength bolt 24, ultimately form girder steel lattice.The setting of 4 top surface of crossbeam is laterally existing
Band 7 is poured, is equally connect by WELDING STUDS with crossbeam top plate 18.The lateral wide 500mm in 7 bottom of cast-in-site stripe, thick 240mm are inside set cast-in-place
Band reinforcing bar 8, cast-in-site stripe reinforcing bar 8 use regular reinforcement 32.Anchor tie plate 28 is welded on main longitudinal grider top plate 12,28 center line of anchor tie plate
It is aligned with main longitudinal grider web 13, suspension cable is anchored by anchor tie plate 28 with girder.Wherein, anchor tie plate 28 is configured with two pieces of anchors
Pulling plate stiffened steel plates 29, main longitudinal grider top plate 12 is corresponding to below the position while welding of anchor tie plate stiffened steel plates 29 to be welded with main longitudinal grider anchor
Draw stiffened steel plates 30.
The construction method of the present embodiment carries out piecewise free cantilever erection to girder steel lattice first and installs suspension cable, subsequent piecemeal
The UHPC prefabricated board 3 of corresponding beam section is lifted, last subregion construction UHPC transverse direction cast-in-site stripe 7, main longitudinal cast-in-site stripe 5 and centre are vertical
To cast-in-site stripe 6 and high temperature steam curing is carried out, the two times tensioning suspension cable after each cast-in-site stripe reaches design strength, then set up next
Beam section, so circulation are until closure.In order to utmostly reduce UHPC floorings shrinkage and creep to the adverse effect of main beam structure,
Prefabricated board 3 used high temperature steam curing, and at precasting yard storage no less than 2 months.
The construction method of steel master's-UHPC combination beam for cable-stayed bridge of the present embodiment is specific as follows：
1) divide beam section processing and manufacturing main longitudinal grider 2, crossbeam 4, intermediate longitudinal girder 1 and anchor tie plate 28,28 groups of anchor tie plate are welded in
On main longitudinal grider top plate 12, and socket cap WELDING STUDS is welded in main longitudinal grider 2, crossbeam 4 and 1 top surface of intermediate longitudinal girder, in steel structure surface
Do anticorrosive coating；According to the size installation template of monolithic UHPC prefabricated board 3, prefabricated board reinforcing bar 10 is bound, is prepared in prefabricated board
10 both ends of prefabricated board reinforcing bar need to be stretched out from 3 edge joint of prefabricated board, be poured ultra-high performance concrete and carry out high-temperature steam and support
Shield reaches after design strength demoulding storage no less than 2 months.
2) using bridge floor walking loop wheel machine, the piecewise free cantilever erection main longitudinal grider 2 of bridge location, crossbeam 4 and intermediate longitudinal girder 1 are to form girder steel
Lattice, installation suspension cable are anchored on anchor tie plate 28 and carry out first time tensioning.
3) bridge location hoisting prefabricated plate 3 paragraph by paragraph, is held on the rubber pad 11 of girder steel lattice top surface；
4) the cast-in-site stripe reinforcing bar 85 in main longitudinal cast-in-site stripe, in intermediate longitudinal cast-in-site stripe 6 and lateral cast-in-site stripe 7 is bound, is adopted
The prefabricated board reinforcing bar 10 that corresponding cast-in-site stripe reinforcing bar 8 and prefabricated board 3 stretch out is connected with the mode of welding or binding, is poured each cast-in-place
Band ultra-high performance concrete makes each prefabricated bridge and girder steel lattice be linked to be entirety.
5) high temperature steam curing is carried out to each cast-in-site stripe, second of tensioning is carried out to suspension cable after reaching design strength.
6) circulation carries out 2~step 5 of above-mentioned steps, until full-bridge joins the two sections of a bridge, etc.
7) wearing course is overlayed on floorings and is conserved, and construction is completed.
Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (10)
1. a kind of steel-UHPC combination beam for cable-stayed bridge, it is characterised in that：Including two main longitudinal griders (2) being arranged in parallel, two
The crossbeam (4) more than root being connected with main longitudinal grider (2) and two pieces or more UHPC prefabricated board (3), each crossbeam (4) is along longitudinal direction
It is evenly arranged between two main longitudinal griders (2), is connected in the middle part of adjacent two crossbeams (4) by intermediate longitudinal girder (1), institute
It states main longitudinal grider (2), intermediate longitudinal girder (1) and adjacent two crossbeams (4) and cooperatively forms girder steel lattice, each prefabricated board (3) is one by one
It is accordingly erected on each girder steel lattice, the main longitudinal grider (2) is equipped with the main longitudinal cast-in-site stripe (5) of UHPC, and the centre is vertical
Beam (1) is equipped with longitudinal cast-in-site stripe (6) among UHPC, and the crossbeam (4) is equipped with UHPC transverse direction cast-in-site stripe (7), and the master is vertical
Cast-in-site stripe reinforcing bar (8) and shear key are equipped with into cast-in-site stripe (5), intermediate longitudinal cast-in-site stripe (6) and lateral cast-in-site stripe (7)
(9), be equipped in the prefabricated board (3) along longitudinal direction with the prefabricated board reinforcing bar (10) of lateral arrangement, each prefabricated board reinforcing bar (10)
Both ends extend out to the prefabricated board (3) outside and are connected with corresponding cast-in-site stripe reinforcing bar (8), in main longitudinal cast-in-site stripe (5)
Shear key (9) is connected with the main longitudinal grider (2), the shear key (9) and the intermediate longitudinal girder in intermediate longitudinal cast-in-site stripe (6)
(1) it is connected, the shear key (9) in the transverse direction cast-in-site stripe (7) is connected with the crossbeam (4).
2. steel-UHPC the combination beam according to claim 1 for cable-stayed bridge, it is characterised in that：On the prefabricated board (3)
The edge in portion is recessed, main longitudinal cast-in-site stripe (5), intermediate longitudinal cast-in-site stripe (6) and described lateral cast-in-site stripe (7) top
It all extends to above corresponding lower recess.
3. steel-UHPC the combination beam according to claim 2 for cable-stayed bridge, it is characterised in that：The prefabricated board (3) with
The faying face of main longitudinal cast-in-site stripe (5) is serrated face.
4. steel-UHPC the combination beam according to claim 2 for cable-stayed bridge, it is characterised in that：The prefabricated board (3) with
Rubber pad (11) are equipped between the girder steel lattice.
5. steel-UHPC the combination beam according to claim 1 for cable-stayed bridge, it is characterised in that：Under the prefabricated board (3)
The position enlarged in thickness that portion is contacted with the girder steel lattice.
6. steel-UHPC the combination beam according to any one of claim 1 to 5 for cable-stayed bridge, it is characterised in that：It is described
Main longitudinal grider (2) uses I-shaped section, and main longitudinal grider (2) includes main longitudinal grider top plate (12), main longitudinal grider web (13) and main longitudinal grider
Bottom plate (14), the main longitudinal grider top plate (12) are connected with the shear key (9), are welded on the outside of the main longitudinal grider web (13) more
Block longitudinal direction stiffened steel plates (15), longitudinal direction stiffened steel plates (15) described in muti-piece are vertically evenly arranged, the main longitudinal grider top plate (12)
Between longitudinal stiffened steel plates (15) of top side, it is between adjacent two longitudinal stiffened steel plates (15) and most lower
Outer lateral stiffening steel plate (16), institute are welded between longitudinal stiffened steel plates (15) of side and the main longitudinal grider bottom plate (14)
It states and is welded with interior lateral stiffening steel plate (17) on the inside of main longitudinal grider web (13).
7. steel-UHPC the combination beam according to claim 6 for cable-stayed bridge, it is characterised in that：The crossbeam (4) uses
I-shaped type end side, crossbeam (4) include crossbeam top plate (18), cantilever diaphragm (19) and crossbeam bottom plate (20), the crossbeam top plate
(18) it is connected with the shear key (9), is welded with sash steel plate (21) on the cantilever diaphragm (19) and muti-piece is vertical
Stiffened steel plates (22), vertical stiffened steel plates (22) described in muti-piece are transversely evenly arranged, the cantilever diaphragm (19) with it is described interior
Be provided with splicing steel plate (23) between lateral stiffening steel plate (17), the splicing steel plate (23) and the cantilever diaphragm (19) it
Between and splicing steel plate (23) and the interior lateral stiffening steel plate (17) between pass through high-strength bolt (24) respectively and connect.
8. steel-UHPC the combination beam according to claim 7 for cable-stayed bridge, it is characterised in that：The intermediate longitudinal girder (1)
Using I-shaped section, intermediate longitudinal girder (1) includes intermediate longitudinal girder top plate (25), intermediate longitudinal girder web (26) and intermediate longitudinal girder bottom
Plate (27), the intermediate longitudinal girder top plate (25) are connected with the shear key (9), the vertical dimension of the intermediate longitudinal girder web (26)
It is described vertical in the middle part of the intermediate longitudinal girder web (26) and crossbeam (4) less than the vertical dimension of the main longitudinal grider web (13)
It is connected between stiffened steel plates (22) by high-strength bolt (24).
9. a kind of construction method of the steel-UHPC combination beam described in any item of the claim 1 to 8 for cable-stayed bridge, special
Sign is：Include the following steps：
S1：Each steel member and prefabricated board (7) processing：Segmental machining manufactures main longitudinal grider (2), crossbeam (4) and intermediate longitudinal girder (1), and
Anchor tie plate (28) are installed on main longitudinal grider (2), shear key is installed on main longitudinal grider (2), crossbeam (4) and intermediate longitudinal girder (1)
(9), anticorrosive coating is carried out on each steel member surface；According to the design size installation template of UHPC prefabricated board (3), prefabricated board is bound
Reinforcing bar (10), and prefabricated board reinforcing bar (10) both ends configured need to be extend out to other than the template of prefabricated board (3), and it is mixed to pour very-high performance
Solidifying soil is simultaneously conserved, and demoulds storage after reaching design strength；
S2：Walked loop wheel machine using bridge floor, the piecewise cantilever of bridge location respectively assembled main longitudinal grider (2), crossbeam (4) and intermediate longitudinal girder (1) with
Girder steel lattice are formed, installation suspension cable is anchored on anchor tie plate (28) and carries out first time tensioning；
S3：Using bridge floor walking loop wheel machine, lifting installation prefabricated board (3), prefabricated board (3) is arranged on girder steel lattice paragraph by paragraph；
S4：Pour each cast-in-site stripe：Bind main longitudinal cast-in-site stripe (5), intermediate longitudinal cast-in-site stripe (6) and lateral cast-in-site stripe (7)
Cast-in-site stripe reinforcing bar (8), and corresponding cast-in-site stripe reinforcing bar (8) is mutually connected with the prefabricated board reinforcing bar (10) stretched out in prefabricated board (3)
It connects, being poured each cast-in-site stripe ultra-high performance concrete, to connect each prefabricated board (3) with girder steel lattice integral；
S5：Each cast-in-site stripe is conserved, second of tensioning is carried out to suspension cable after reaching design strength；
S6：Circulation carries out step S2 to S5, until full-bridge joins the two sections of a bridge, etc；
S7：Wearing course is overlayed on bridge floor and is conserved, and construction is completed.
10. construction method according to claim 9, it is characterised in that：In step S1, to the ultra-high performance concrete poured
Prefabricated board (3) carries out steam curing, and the demoulding resting period is no less than two months；To each very-high performance coagulation poured in step S5
Native cast-in-site stripe carries out steam curing.
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| CN114250694A (en) * | 2021-12-01 | 2022-03-29 | 中铁大桥局集团有限公司 | UHPC permanent template and preparation method thereof |
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Application publication date: 20181123 |