A kind of few girder composite beam bridge of employing Prefabricated composite floorings and its construction method
The present invention relates to composite bridge technical field, and in particular to a kind of few girder of employing Prefabricated composite floorings
Composite beam bridge and its construction method.
At present, with the development and practice of science of bridge building, with regard to the increasing engineering skill of application of Short/Medium Span Bridge
Art personnel have reached following common recognition：Mid and minor spans concrete beam bridge (such as prestressed T beam, small box girder) construction technology is ripe, make
Valency is relatively low, but its construction period it is long, from great, poor durability；Truss bridge can greatly shorten the duration, reduce structure
Deadweight, but cost is higher, and the disease of orthogonal special-shaped steel bridge deck is projected；Steel plate and concrete composite beam fast-developing in recent years
Bridge, then given full play to the characteristic of material, not only easy construction, short time limit, conducts oneself with dignity low, and cost is relatively low, and has
Wide variety of technical conditions and economic base in Short/Medium Span Bridge.
It is American-European-Japanese to wait prosperity widely used steel reinforced concrete combination beam of bridge in the range of 25-60m across footpaths, its form mainly to include steel
Plate composite beam bridge, separated steel case composite beam bridge and Integral Steel case composite beam bridge.For the wider bridge of Medium Span, bridge width
Beam, steel plate combination beam is open section due to it, and antitorque and bending rigidity is relatively low, should not be adopted.Integral Steel case composite beam bridge
Overall performance is good, and bending resistance and torsional rigidity are higher, but steel using amount is higher, and economic performance is poor.Separate type composite beam of steel box point
For several little steel box-girders, section bending resistance and torsional rigidity have between steel plate combination beam and monoblock type composite beam of steel box
Preferable mechanical property, but if it is that the stress for ensureing concrete slab is had to when applying on the larger bridge of bridge width
Reduce girder direction across bridge spacing, increase steel using amount, so as to limit its range of application.Therefore, separate type composite beam of steel box is improved
Floorings stress is particularly important.
At present, the conventional floorings form of combination beam mainly has reinforced concrete bridge deck plate and prestressed concrete bridge face
Plate.Wherein reinforced concrete bridge deck plate from great, average thickness of slab about 28cm, maximum transversal span about 5m, and under load action
Easily cracking damage, affects structure durability.When floorings horizontal span is larger, prestressed concrete bridge face is typically adopted
Plate, but it needs live tensioning transverse prestress, and construction procedure is loaded down with trivial details.And the thickness of slab of prestressed concrete bridge panel is still thicker,
About 26cm, conducts oneself with dignity larger.By taking across footpath 4x40m, the composite beam bridge of bridge width 16.5m as an example, it is considered to the deck paving of 10cm it
Afterwards, the deadweight of prestressed concrete bridge panel accounts for the 68% of structure always deadweight, if can not reduce floorings bearing capacity and
Mitigate floorings deadweight on the basis of rigidity, by the horizontal span of greatly increase floorings, improve its scope of application.Therefore,
Develop a kind of bearing capacity height, reasonable stress, form it is simple, from the floorings form of heavy and light, it is prefabricated using modularization, apply
It is particularly important on few girder composite beam bridge.
The content of the invention
The technical problem to be solved is to overcome the shortcomings of to be mentioned and defect in background above technology, there is provided one
Plant the few master from the larger employing Prefabricated composite floorings of heavy and light, large carrying capacity, reasonable stress, good integrity, adaptation width
Beam composite beam bridge and its construction method.
To solve above-mentioned technical problem, technical scheme proposed by the present invention is：
A kind of few girder composite beam bridge of employing Prefabricated composite floorings, including many steel box-girder, companies along bridges to setting
The Prefabricated composite floorings that the gooseneck and polylith of the steel box-girder are set up on the steel box-girder are connect, it is adjacent described prefabricated group
Close interval between floorings and form laterally wet seam, the Prefabricated composite floorings include the shaped steel of many direction across bridge arrangements and
Pour the concrete layer on the shaped steel, the bottom welding of the shaped steel on the steel box-girder, the Prefabricated composite
Floorings form longitudinal wet joint in the top extent of the steel box-girder, on the shaped steel in the range of the longitudinal wet joint
Multiple through holes are offered, the perforation reinforcing bar of many shaped steel of connection is equipped with the through hole, in the concrete layer
Vertically and horizontally bar-mat reinforcement is provided with, the vertically and horizontally bar-mat reinforcement stretches out the prefabricated scope of the Prefabricated composite floorings and wears with described
Hole bar connecting, cast-in-place wet joint concrete in the laterally wet seam and longitudinal wet joint.Few girder composite beam bridge is adopted
With above-mentioned Prefabricated composite deck structrue bearing capacity height, reasonable stress, from heavy and light, be applicable to highway and city it is medium across
Footpath (40-60m), bridge width wider (10-18m), the bridge of girder radical less (2-3 roots), efficiently solve existing bridge floor
Plate from great, horizontal span it is little, it is easy to crack the problems such as；Prefabricated using modularization, version is simple, short construction period, synthesis
As the further improvement to above-mentioned technical proposal：
Preferably, the concrete layer includes the first concrete layer and the second concrete layer, described the
One concrete layer is the bridge overall with for removing the steel box-girder width range, and second concrete layer is by steel box-girder
Outside extend 15-25cm to inner side, the height of the second concrete layer is the Prefabricated composite floorings overall height.Will be prefabricated
Concrete layer is divided into two parts, wherein the first concrete layer is arranged on the top of shaped steel, it is highly less than concrete
Soil layer overall height, and the height of the second concrete layer is equal to Prefabricated composite floorings overall height, so arranging can effectively reduce pre-
Combined bridge deck deadweight processed.
It is furthermore preferred that the shaped steel is provided with weldering nail with the upper surface of the first concrete layer joining part being connected
Part, it is ensured that the first concrete layer and the compound action of shaped steel, participates in stress jointly.Second concrete layer is in institute
State and wrap up the shaped steel in the range of Prefabricated composite floorings overall height, make the second concrete layer participate in stress jointly with shaped steel.
It is furthermore preferred that the thickness of the Prefabricated composite floorings is 26-36cm, the height of the shaped steel is 10-16cm, institute
The thickness for stating the first concrete layer is 16-20cm, and the width of the laterally wet seam is 40-60cm, Prefabricated composite bridge floor
Plate stress, shaped steel tension, concrete layer are pressurized, and few girder composite beam bridge has good stressing conditions.It is described wet to connect
Seam concrete is steel fiber reinforced concrete, and the steel fibre formed using the short steel fibre that random distribution is mixed in normal concrete is mixed
Solidifying soil, the steel fibre of random distribution can effectively hinder extension and the macroscopic view of inside concrete microcrack in the steel fiber reinforced concrete
The formation in crack, significantly improves tension, bending resistance, shock resistance and the anti-fatigue performance of concrete, with good ductility.Using
Steel fiber reinforced concrete pours wet seam can further improve the stressing conditions of few girder composite beam bridge.
Preferably, the quantity of the shaped steel is 4-6 roots, and the suitable bridge between the adjacent shaped steel to spacing is 0.8-1.5m,
The concrete numerical value of the spacing calculates analysis and determines according to the specific requirement of bridge.The through hole is circular hole, and is opened in described
The center of the web of shaped steel, further improves stress.
Preferably, the steel box-girder includes steel box-girder web, the steel box-girder top board being welded on above the steel box-girder web
And the steel box-girder base plate being welded on below the steel box-girder web, the thickness of the steel box-girder base plate is more than the steel box-girder top
The thickness of plate, the height of the steel box-girder web is controlled in 1/3- with the ratio of the steel box-girder top board and the width of steel box-girder base plate
1/2.Using separated steel case combined beam structure, with reference to the Prefabricated composite floorings of the present invention, it is ensured that composite beam bridge have compared with
Section bending resistance well and torsional rigidity, with good mechanical property so that larger direction across bridge can be kept between steel box-girder
Spacing, reduces steel using amount, alleviates bridge deadweight, and then expands the range of application of the composite beam bridge.The steel box-girder top
Top board weldering nail connector is provided with plate, it is ensured that steel box-girder and the compound action of wet joint concrete, stress is participated in jointly.It is described
Top board weldering nail connector is in arranged in rows, and between the top board weldering nail connector and shaped steel at the shaped steel gap is left, and is made
Obtain wet joint concrete to be in close contact with shaped steel, fill closely knit.
It is furthermore preferred that in the steel box-girder top board, steel box-girder base plate and steel box-girder web inside the chamber of the steel box-girder
On be provided with ribbed stiffener, the ribbed stiffener is rib of slab, T-shaped rib, the flat rib of ball or U ribs, arrange inside the chamber of steel box-girder plus
Strength rib, improves the stability and torsional property of steel box-girder.
It is furthermore preferred that the chamber of the steel box-girder is internally provided with steel diaphragm in polylith, the interior steel diaphragm and the steel
Box beam Welding, is provided with hole on interior steel diaphragm, the ribbed stiffener is longitudinally through arranging in the hole, inside the chamber of steel box-girder
Steel diaphragm in arranging, further increases the stability of steel box-girder, improves the mechanical property of steel box-girder.
It is furthermore preferred that the gooseneck has I shape cross section, connected by bolt between gooseneck and the steel box-girder
Connect or weld, the vertical bridge of gooseneck is consistent with the lengthwise position of the interior steel diaphragm to position.Gooseneck adopts I-steel, stress
Well；The vertical bridge of gooseneck is set to position consistent with the lengthwise position of interior steel diaphragm, improves the combination of many steel box-girders
Stability afterwards.The gooseneck is arranged on the middle and lower part of the steel box-girder, gooseneck and the Prefabricated composite floorings not phase
Connection.The composite beam bridge is set side by side with 2-3 root steel box-girders along direction across bridge, and between adjacent steel box-girder 7-12m is spaced, due to this
The steel box-girder and Prefabricated composite deck structrue of invention has good stress and lighter deadweight, applies the bridge in middle span
Liang Shi, can use less steel box-girder (2-3 roots), and larger spacing can be kept between steel box-girder.
As a total technology design, present invention also offers a kind of few girder of above-mentioned employing Prefabricated composite floorings
The construction method of composite beam bridge, comprises the following steps：
The prefabricated steel box-girder of S1, on-site hoisting is in place, the prefabricated gooseneck of on-site hoisting, and by gooseneck and steel case
Beam is bolted or welds；
S2, on-site hoisting Prefabricated composite floorings, and the Prefabricated composite bridge floor board mounting stand is located on steel box-girder, then
Shaped steel in Prefabricated composite floorings is welded with steel box-girder top board；
S3, perforation reinforcing bar is worn in the through hole of shaped steel, cast in situs steel is fine in horizontal wet seam and longitudinal wet joint
Dimension concrete, maintenance forms floorings, and bridge deck pavement of then constructing on floorings completes few girder composite beam bridge
Compared with prior art, it is an advantage of the current invention that：
(1) using the present invention Prefabricated composite floorings, more existing concrete slab, can mitigate floorings from
40% is weighed, increases the horizontal span of floorings, mitigate bridge structure always deadweight 27%, mitigate the construction costs of bridge.
(2) using the composite beam of steel box structure of few girder so that the composite beam bridge has larger bending rigidity and antitorque
Rigidity, and steel using amount can be saved.When being applied to the wider bridge of Medium Span, bridge width, can well mitigate bridge deadweight, change
Kind bridge force-bearing situation, reduces construction costs.
(3) the Prefabricated composite deck structrue form in few girder composite beam bridge rationally, receive by one-way slabs stress, shaped steel
Drawing, concrete compression so that composite beam bridge has rational stressing conditions.
(4) few girder composite beam bridge factory prefabricating degree is high, and Prefabricated composite floorings are adapted to factory modularization production,
Effectively shorten construction period, reduce construction costs.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the schematic perspective view of the few girder composite beam bridge of the present invention.
Fig. 2 is the axonometric drawing of the few girder composite beam bridge of the present invention.
Fig. 3 is the cross-sectional view of the few girder composite beam bridge of the present invention.
Fig. 4 is the apical axis mapping of Prefabricated composite floorings in the few girder composite beam bridge of the present invention.
Fig. 5 is the lower shaft mapping of Prefabricated composite floorings in the few girder composite beam bridge of the present invention.
Fig. 6 is the structural representation of the few girder composite beam bridge Shaped Steel of the present invention.
Fig. 7 is the partial enlarged drawing of the few girder composite beam bridge of the present invention.
1st, steel box-girder；2nd, gooseneck；3rd, Prefabricated composite floorings；4th, horizontal wet seam；5th, longitudinal wet joint；101st, steel case
Web；102nd, steel box-girder top board；103rd, steel box-girder base plate；104th, top board weldering nail connector；105th, ribbed stiffener；106th, interior steel every
Plate；301st, shaped steel；302nd, concrete layer；303rd, perforation reinforcing bar；304th, vertically and horizontally bar-mat reinforcement；3011st, through hole；3021st,
One concrete layer；3022nd, the second concrete layer.
For the ease of understanding the present invention, more complete is made to the present invention below in conjunction with Figure of description and preferred embodiment
Face, meticulously describe, but protection scope of the present invention is not limited to embodiment in detail below.
It should be strongly noted that when a certain element, to be described as " be fixed on, be fixed in, be connected to or be communicated in " another
When on element, it can be directly fixed, affixed, connection or connect on another element, or by connecting in the middle of other
Fitting is indirectly fixed, affixed, connection or connection are on another element.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to limit the present invention
The present invention adopts a kind of embodiment of few girder composite beam bridge of Prefabricated composite floorings.Few girder composite beam bridge
It is primarily adapted for use in highway and city Medium Span (40-60m), bridge width wider (10-18m), girder radical less (2-3 roots)
Composite beam bridge.As shown in Figures 1 to 7, from Fig. 1 to Fig. 7, it mainly includes many to the structure of few girder composite beam bridge
Along bridge to the steel box-girder 1 for arranging, polylith Prefabricated composite floorings 3 are provided with the restocking of steel box-girder 1, it is horizontal by steel between steel box-girder 1
Beam 2 connects.Interval forms laterally wet seam 4 between adjacent Prefabricated composite floorings 3.The Prefabricated composite floorings 3 include many
Shaped steel 301 and pour the concrete layer 302 on the shaped steel 301 that root direction across bridge is arranged.The bottom welding of shaped steel 301
At the top of steel box-girder 1, Prefabricated composite floorings 3 form longitudinal wet joint 5 in the top extent of steel box-girder 1.On shaped steel 301
Offer side by side to be equipped with multiple through holes 3011, through hole 3011 in the range of longitudinal wet joint 5 and connect wearing for many root type steel 301
Hole reinforcing bar 303.Double-deck vertically and horizontally bar-mat reinforcement 304 are provided with concrete layer 302, vertically and horizontally bar-mat reinforcement 304 stretches out prefabricated
The prefabricated scope of combined bridge deck 3 and overlap with perforation reinforcing bar 303, the bar diameter and reinforcing bar of the vertically and horizontally bar-mat reinforcement 304
Spacing is analyzed according to Force Calculation and bridge structure requires concrete determination.It is live in horizontal wet seam 4 and longitudinal wet joint 5
Pour wet joint concrete.Few girder composite beam bridge adopts separated steel case combined beam structure, by special Prefabricated composite
The structure of floorings 3 improves the stress of bridge in combination with steel box-girder 1, alleviates bridge deadweight, improves the carrying energy of bridge
Power, expands the scope of application of bridge.Prefabricated using modularization, version is simple, short construction period, comprehensive cost low.
In the present embodiment, concrete layer 302 includes the first concrete layer 3021 and the second concrete layer
3022.Wherein, the first concrete layer 3021 is the bridge overall with for removing the width range of steel box-girder 1, and the second concrete
Soil layer 3022 is the part for being extended 15-25cm to inner side from the outside of steel box-girder 1, forms downward boss-shaped, is placed in steel box-girder 1
Top.The height of the second concrete layer 3022 is Prefabricated composite floorings overall height.The precast concrete of shaped steel 301 and first
The upper surface of 3021 joining part of layer is provided with weldering nail connector, and the first concrete layer 3021 is cast in the upper of shaped steel 301
Side, follows closely connector and ensures the concrete layer of shaped steel 301 and first by the weldering being embedded in the first concrete layer 3021
3021, stress is participated in jointly.Second concrete layer 3022 wraps up shaped steel 301 in the range of the overall height of Prefabricated composite floorings 3.
In the present embodiment, the thickness of Prefabricated composite floorings 3 is 26-36cm, and the height of shaped steel 301 is 10-16cm, first
The thickness of concrete layer 3021 is 16-20cm, and laterally the width of wet seam 4 is 40-60cm.First concrete layer
3021 thickness is less than the thickness of the second concrete layer 3022, is conducive to mitigating bridge deadweight.Wet joint concrete is
Steel fiber reinforced concrete, advantageously in the mechanical property for improving few girder composite beam bridge.The quantity of shaped steel 301 is preferably 4-6 roots,
Suitable bridge between adjacent shaped steel 301 is preferably 0.8-1.5m to spacing, and its concrete numerical value calculates true according to the specific requirement of bridge
It is fixed.Through hole 3011 is preferably opened in the center of the web of shaped steel 301, and stress can be made more reasonable.
In the present embodiment, steel box-girder 1 includes steel box-girder web 101, is welded on the steel box-girder top of the top of steel box-girder web 101
Plate 102 and the steel box-girder base plate 103 being welded on below steel box-girder web 101.Wherein, the thickness of steel box-girder base plate 103 is more than
The thickness of steel box-girder top board 102.The width of the height of steel box-girder web 101 and steel box-girder top board 102 and steel box-girder base plate 103 it
Than control in 1/3-1/2.Top board weldering nail connector 104 is provided with steel box-girder top board 102, the top board weldering nail connector 104 is in
Gap is left between arranged in rows, and the top board weldering nail connector 104 and shaped steel 301 at shaped steel 301.In steel box-girder top board
Top board weldering nail connector 104 is set on 102, steel box-girder 1 can be made to join jointly with wet joint concrete 6 and Prefabricated composite floorings 3
With stress, gap is left between top board weldering nail connector 104 and shaped steel 301, it is ensured that wet joint concrete 6 pours closely knit.
In the present embodiment, in steel box-girder top board 102, steel box-girder base plate 103 and steel box-girder web inside the chamber of steel box-girder 1
Ribbed stiffener 105 is provided with 101, the ribbed stiffener 105 is preferably rib of slab, T-shaped rib, the flat rib of ball or U ribs.In the case of steel box-girder 1
Chamber interior arranges ribbed stiffener 105, can effectively improve the stability and torsional property of steel box-girder 1.Set inside the chamber of steel box-girder 1
Steel diaphragm 106 in polylith are equipped with, the interior steel diaphragm 106 is welded with the inwall of steel box-girder 1, and on interior steel diaphragm 106 hole is provided with, and is put more energy into
Rib 105 is longitudinally through being arranged in the hole.Thus, further increasing the stability of steel box-girder 1, the power of steel box-girder 1 is improved
The gooseneck 2 of many steel box-girders 1 of connection has I shape cross section, and bolt is passed through between gooseneck 2 and steel box-girder 1
Connection is welded, and the vertical bridge of gooseneck 2 is consistent with the lengthwise position of interior steel diaphragm 106 to position.Thus, gooseneck 2 adopts work
Word girder steel stress is good, and interior steel diaphragm 106 is consistent with the lengthwise position of gooseneck 2, after improve many combinations of steel box-girders 1
Stability.Gooseneck 2 is arranged on the middle and lower part of steel box-girder 1, and gooseneck 2 is not connected with Prefabricated composite floorings 3, can be more preferable
Stably lack girder composite beam bridge in ground.The composite beam bridge is set up in parallel 2-3 roots steel box-girder 1 along direction across bridge, and between adjacent steel box-girder 1
Interval 7-12m.Because the steel box-girder 1 and the structure of Prefabricated composite floorings 3 of the present invention have good stress and lighter deadweight,
When applying in highway and city Medium Span composite beam bridge, can use less steel box-girder 1 (2-3 roots), and steel box-girder 1
Between can keep larger spacing.The Prefabricated composite floorings 3 that the few girder composite beam bridge is adopted from heavy and light, bearing capacity
Greatly, system reasonable stress, material use efficiency high and good integrity, adapt to the larger bridge of width, and suitable industrialization is built
Make, short construction period simple with version, stress performance is good, the advantage of comprehensive cost low.Efficiently solve existing bridge floor
Plate from great, horizontal span is little, it is easy to crack the problems such as.
The construction method of few girder composite beam bridge is as follows：
First, the prefabricated steel box-girder 1 of on-site hoisting is in place, the prefabricated gooseneck 2 of on-site hoisting, and by gooseneck 2
It is bolted or welds with steel box-girder 1；
Then, on-site hoisting Prefabricated composite floorings 3, and the installation of Prefabricated composite floorings 3 is erected at into steel box-girder 1
On, then the shaped steel 301 in Prefabricated composite floorings 3 and steel box-girder top board 102 are welded；
Finally, perforation reinforcing bar 303 is worn in the through hole 3011 of shaped steel 301, in horizontal wet seam 4 and longitudinal wet joint 5
Interior cast in situs steel fiber reinforced concrete, maintenance forms floorings, and bridge deck pavement of then constructing on floorings completes few
The construction of girder composite beam bridge.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.