A kind of combination beam Stayed Cable Bridge panel novel seam structure and its construction method
Technical field
The invention belongs to technical field of bridge engineering, and in particular to a kind of combination beam Stayed Cable Bridge panel novel seam structure
And its construction method.
Background technique
It is a kind of new structure pattern to grow up on the basis of steel construction and concrete structure that steel-, which mixes combination beam, it
It is being handed over by the way that shear connector is arranged between the concrete flange plate concrete slab on the girder steel of lower part and top with resisting the two
Interface start and Relative sliding, both make to become an entirety and work together.
Assembled steel-mixes composite beam bridge and is made of steel girder and concrete slab, has given full play to steel and concrete
The respective mechanical property of material.Steel girder and the concrete slab concentration pre-casting in factory, transport to construction site carry out
Assembly, then pouring structure seam is to form overall structure and continuous system.For the lifting weight for reducing steel reinforced concrete combination beam prefabricated component
It measures and is readily transported, generally longitudinal seam is arranged on the floorings of adjacent two girder middle in assembled steel reinforced concrete composite beam bridge,
Splicing prefabricated components complete after-pouring joint concrete and form entirety.
It is poured and prefabricated bridge floor currently, common floorings longitudinal joint connecting structure mostly uses prefabricated bridge protruding bar to add
Mode of the plate with the concrete of label.Prefabricated bridge protruding bar is generally annular in seam or form of straight lines, only binds
Or when non-treated, seam connection reliability is insufficient, is easy to produce disease;According to reinforcement welding, then site welding heavy workload,
And it is affected by site operation environment.
During steel-concrete composite beam prefabricated construction, wet seam is by the prefabricated bridge and girder steel of assembling
Grid connects integral key, and the WELDING STUDS at wet seam interface is even more to transmit interface shear stress to make the important of the whole stress of the two
Component, however the interface gaps of wet seam and concrete cracking and new and old faying face hold that the WELDING STUDS at interface very
Effect vulnerable to environmental corrosion.
Clear stipulaties are " when floorings use in advance in China " Composite Steel-Concrete Bridges design specification GB50917-2013 "
When reinforced concrete bridge deck plate processed, Ying Caiyong measure makes closely connected between prefabricated board and girder steel, meets waterproof requirement ", " highway steel simultaneously
Mixed combined bridge design and construction specification JTG/T D64-01-2015 " in about also being provided in steel reinforced concrete contact surface durability Design
" should prevent contact surface from coming to nothing from concrete configuration, detailing requiments and construction technology etc. ".Thus, it could be seen that solidifying for steel reinforced concrete
It is an indispensable design link that native combination beam combination interface, which carries out Anti-corrosion design with the durability for guaranteeing structure,.
The WELDING STUDS at wet seam interface is the key member for guaranteeing combination beam combined effect, is embedded in the construction process
In wet joint concrete, after construction, it cannot replace easily.In a corrosive environment, guaranteeing that WELDING STUDS is not rusted is to protect
Structure safety and durable key are demonstrate,proved, for some river-spanning bridges over strait, realizes 100 years service lifes of structure more
It is to require to carry out durability Design and protection for the critical component of structure, and seal steel only with general rubber strip at present
The method in mixed gap can not reach design effect, joint concrete cracking wet for combination beam and new-old concrete contact surface
Uncompacted situation does not have anti-corrosion meaning.
And traditional stem grafting seam connection method is the first welding cluster type weldering nail on the girder steel of seam crossing, then in seam crossing two
Concrete perfusion or epoxy resin mortar between concrete slab, so that girder steel and concrete slab are connected as entirety, girder steel and coagulation
Mutually sliding is resisted by weldering nail between native plate.
This joint form need to weld a large amount of weldering nails on girder steel, and the reinforcing bar of seam crossing concrete slab need to be welded, work
Sequence is complicated, and long construction period, there may be residual stress for weld, and power transmission is not direct enough;Poured in place concrete is not easily-controllable
Construction quality processed, and the influence of the contraction abutment joint of concrete is difficult to estimate.
Summary of the invention
In view of above-mentioned, the present invention provides a kind of combination beam Stayed Cable Bridge panel novel seam structure and its construction method,
With an improved the structure type at conventional seams, the precast assembly degree of component in science of bridge building is improved, the novel seam
In bolt connection piece play the role of connection and shearing resistance simultaneously.
A kind of combination beam Stayed Cable Bridge panel novel seam structure, including girder steel, two concrete slabs to be spliced, steel section
Contact plate and bolt connection piece are provided on concrete slab, steel gusset plate and girder steel top flange plate and to pass through for bolt connection piece
Location hole;The bolt connection piece includes sleeve, top bolt and bottom bolts, and sleeve is embedded in the location hole of concrete slab in advance
It is interior, the location hole on steel gusset plate and girder steel top flange plate is divided to or so it is two rows of and respectively with the location hole phase on two concrete slabs
Alignment, the gap between two concrete slabs using epoxy resin mortar perfusion filling, top bolt pass through steel gusset plate location hole with
Bush whorl connection in concrete slab, bottom bolts pass through the bush whorl in girder steel top flange plate location hole and concrete slab
Connection.
Further, the concrete slab is by prefabrication and the internal duct for being provided with transversely prestressed bars and passing through.
Further, the length sleeve is consistent with concrete plate thickness, and the width of steel gusset plate is more than or equal to girder steel
The width of top flange plate.
Further, two concrete slabs are linked together by the bolt connection piece with girder steel, while playing shear connections
The effect of part.
Further, the junction of the girder steel and concrete slab is laid with plastic film, and effect is to avoid epoxy resin mortar
It is bonded with girder steel, leads to influence of the girder steel by transverse prestress.
Without welding cluster type weldering nail on girder steel in the present invention, part and epoxy sand is bolted in concrete slab and girder steel
Slurry is connected.
The construction method of said combination girder stayed-cable bridge floorings novel seam structure, includes the following steps:
(1) precast slab, by the set of spacing pre-embedded bolt connector in concrete slab of design in manufacturing process
Cylinder;
(2) slot for being laid with plastic film in concrete slab and girder steel junction, while being reserved between two concrete slabs
Epoxy resin mortar is perfused in seam;
(3) transversely prestressed bars in jack tension concrete slab are utilized;
(4) bottom bolts girder steel top flange plate location hole is passed through to connect with the bush whorl being embedded in concrete slab,
Bolt is tightened, girder steel is made to be connected with concrete slab;
(5) steel gusset plate is made to complete positioning on concrete slab, then by top bolt across steel gusset plate location hole and in advance
The bush whorl connection being embedded in concrete slab, tightens bolt, forms shear connector.
Further, the epoxy resin mortar being perfused in the step (2) had been perfused to connect two pieces of precast slabs
Guarantee that epoxy resin mortar perfusion is uniformly closely knit in journey as far as possible, is linked together entire floorings seam.
Further, the steel gusset plate is in manufacturing process, its is symmetrically placed on girder steel top flange plate, according to spiral shell
The spacing for tethering fitting drills out location hole on steel gusset plate and girder steel top flange plate.
There are transverse prestresses for combination beam Stayed Cable Bridge panel in work progress of the present invention, to avoid tensioning transverse prestress
When cause concrete slab to crack due to the connection of girder steel and concrete slab, complete laterally to answer in advance with jack before bolt is installed
The tensioning of power.
Compared with prior art, the present invention has following advantageous effects:
1. bolt connection piece of the invention makes, prefabricated, sleeve pre-buried and steel gusset plate the production of concrete slab
Can be completed in factory, scene only carries out the connection of concrete slab and girder steel and the perfusion of epoxy resin mortar, accelerate construct into
Degree.
2. the present invention is suitable for combination girder stayed-cable bridge, in the construction of novel seam, it is laid with plastic film and avoids epoxy resin mortar
When being connect with girder steel, therefore applying transverse prestress floorings with girder steel is not formed is stably connected with, improve the transverse direction of concrete slab
Prestressed application efficiency.
3. the present invention is connected with part and follows closely instead of weldering, played while realizing the connection of concrete slab and girder steel anti-
The effect for cutting connector eliminates the process for welding cluster type weldering nail on girder steel, reduces welding workload, simplifies construction work
Sequence.
4. the present invention fills the line of rabbet joint of two blocks of precast concretes with epoxy resin mortar, poured in place concrete is avoided, is accelerated
Speed of application reduces environmental pollution, convenient for control construction quality.
5. the present invention is connected by screw bolts part and is attached to concrete slab and girder steel, easy to operate quickly, it can be achieved that mixed
Concrete board and girder steel are detachably connected;Bolt connection piece as shearing resistance effect is evenly distributed in two concrete slabs, and
It is not concentrated on epoxy resin mortar seam crossing, structure stress is more clear, reasonable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of combination beam Stayed Cable Bridge panel Novel connecting of the present invention seam.
Fig. 2 is the sequence of construction figure of combination beam Stayed Cable Bridge panel Novel connecting of the present invention seam.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
As shown in Figure 1, combination beam Stayed Cable Bridge panel novel seam structure of the present invention, including girder steel 1, to be spliced two pieces
Concrete slab 2, steel gusset plate 3 and bolt connection piece 4, concrete slab 2 use strength grade for the concrete of C40~C60 or
High performance concrete, thickness is between 240mm~280mm.Wide 1~the 2cm in 5 end of the line of rabbet joint between concrete slab, middle part is wide by 3~
4cm, 3 thickness of steel gusset plate depend on the ratio of reinforcement of concrete slab, guarantee being not less than for the 3 section gross area of junction steel gusset plate
The sum of the reinforcing steel area of the concrete slab direction, bolt pitch of holes take 5 times of diameters of bolt.
The location hole passed through for bolt connection piece is provided on 1 top flange plate of concrete slab 2, steel gusset plate 3 and girder steel;Spiral shell
Tethering fitting 4 includes top bolt 101, sleeve 102 and bottom bolts 103, and sleeve 102 is embedded in the location hole of concrete slab in advance
It is interior, the location hole on 1 top flange plate of steel gusset plate 3 and girder steel is divided to or so it is two rows of and respectively with the positioning on two concrete slabs 2
Hole aligns.
Concrete slab 2 is pressed at the internal duct for being provided with transversely prestressed bars and passing through, production as needed by prefabrication
The sleeve 102 of spacing pre-embedded bolt connector 4 is designed, 102 length of sleeve is consistent with 2 thickness of concrete slab.
Steel gusset plate 3 is factory's batch machining, and the width of steel gusset plate 3 is greater than or equal to the width of girder steel top flange, fixed
Position number of perforations and position are identical as bolt connection piece.The diameter of location hole should meet gusset plate intensity greater than spiral shell with to Edge Distance
Tether the shearing strength of fitting.When gusset plate 3 is processed, guarantee that each section thickness of gusset plate is equal.
Girder steel 1 and two concrete slabs 2 are linked together by bolt connection piece 4, while playing the role of shear connector, top
The location hole that portion's bolt 101 passes through steel gusset plate 3 is connect with bush whorl pre-buried in concrete slab 2, and bottom bolts 103 pass through
1 top flange plate location hole of girder steel is connect with bush whorl pre-buried in concrete slab 2;In the line of rabbet joint 5 between two concrete slabs
Perfusion epoxy resin mortar makes its co-operation, and selected epoxy resin mortar design strength is not less than bridge deck concrete design strength, steel
The not set cluster type weldering nail in 1 top flange of beam.
Girder stayed-cable bridge is combined there are transverse prestress, due to girder steel 1 and concrete slab 2 when need to avoid tensioning transverse prestress
Connection cause concrete slab to crack;The junction of girder steel 1 and concrete slab 2 is laid with plastic film, and the effect of plastic film is
It avoids epoxy resin mortar and girder steel from bonding, causes girder steel 1 by the influence of transverse prestress, tensioning transverse prestress need to be in installation spiral shell
It is completed before bolt.
As shown in Fig. 2, the construction method of combination beam Stayed Cable Bridge panel Novel connecting seam of the present invention, includes the following steps:
A. gusset plate is made.
When making steel gusset plate 3, steel gusset plate 3 is symmetrically placed on girder steel 1, and location hole is according between bolt connection piece
Away from determination.Positioning bore dia on girder steel 1 and steel gusset plate 3 should be 1~1.5mm bigger than bolt diameter.When drilling, should first by
Gusset plate is placed in 1 top flange corresponding position of girder steel, with the synchronous drilling of boring bar tool or using the location hole on gusset plate 3 as reference
Location hole on flange plate is drilled through, to guarantee that upper lower Positioning holes precisely align.
B. pre-embedded bolt connector sleeve.
Bolt connection piece 4 is made of top bolt 101, sleeve 102 and bottom bolts 103, by design before casting concrete
Sleeve 102 is arranged in good spacing, takes necessary seal approach that concrete slurry is avoided to enter sleeve 102, and fixed in template,
Casting process middle sleeve 102 is avoided to tilt.
Before concreting, concrete slump is tested, slump value need to meet within the scope of 180~200mm, and necessary
The cohesiveness and water-retaining property of concrete are observed, after confirmation concrete workability is good, mould can be entered and poured.
Concrete slab 2 need to guarantee the surface at surfacing, especially built-in connection sleeve 102, flatness when prefabricated
Error is not preferably greater than 2mm, to guarantee that concrete slab 2 and steel gusset plate 3 are closely affixed, increases service life.
C. it is laid with plastic film in concrete and girder steel junction, epoxy resin mortar is perfused.
It is laid with plastic film in girder steel 1 and 2 intersection of concrete slab, and is fixed at girder steel top flange, effect is to keep away
Exempt to bond in epoxy resin mortar and girder steel 1, causes girder steel 1 by the influence of transverse prestress.When being laid with plastic film, guarantee film
It is laid with smooth, film at the line of rabbet joint 5 is avoided to generate fold and influence epoxy resin mortar construction quality.
Epoxy resin mortar is perfused in the line of rabbet joint 5 reserved between concrete slab, connects two pieces of precast slabs 2, protects as far as possible
It is uniformly closely knit to demonstrate,prove epoxy resin mortar perfusion, is linked together entire floorings seam.After the completion of epoxy resin mortar perfusion, it is more to remove surface
Remaining epoxy resin mortar guarantees that joint surface is smooth, and with concrete slab flush, height error is not greater than 1mm.Surface treatment
Afterwards, epoxy resin mortar is suitably conserved, epoxy resin mortar hardening is waited to reach design strength.
D. tensioning concrete slab transverse prestress.
There are transverse prestresses for combination beam Stayed Cable Bridge panel, due to girder steel 1 and mixed when to avoid tensioning transverse prestress
The connection of concrete board 2 cause concrete slab 2 crack, before bolt is installed, epoxy resin mortar use jack after reaching design strength
Complete the tensioning of transverse prestress.It should be using stretching force and the amount of extending dual control, when prestressed strand tensioning reaches when applying prestressing force
When to design stretching force, the control errors of actually extend magnitude and theoretic explication value are within ± 6%.When anchor plate is installed,
It should be specifically noted that it anchors face and presstressed reinforcing steel is perpendicular, and closed protective or preservative treatment are carried out to anchored end in time.
E., bottom bolts are installed.
Bottom bolts 103 are passed through the bolt hole on girder steel to connect with the sleeve 102 being embedded in concrete, tighten spiral shell
Bolt makes girder steel 1 be connected with concrete slab 2.Bottom bolts 103 should be tightened when installation, guarantee nut and girder steel top flange plate
It is close to, and carries out anti-corrosion measure in time, spray painting is handled after surface clean decontamination, enhancing structure durability.
F. installation top bolt and steel gusset plate.
Steel gusset plate 3 is completed to positioning on concrete slab, then top bolt 101 is passed through steel gusset plate 3 and is embedded in
Sleeve 102 in concrete slab connects, and tightens top bolt 101, guarantees that nut is close to steel gusset plate 3, completes to be bolted
The installation of part after forming shear connector, removes surface irregularities, carries out spray painting processing with anticorrosion.
Combination beam Stayed Cable Bridge panel is by the prefabricated split-type concrete slab in top and lower part steel beam splicing group in the present invention
At, between two block concretes by be perfused epoxy resin mortar be connected as one, part is bolted between concrete slab and girder steel
Splicing is integrated, and is avoided and is welded nail in girder steel top flange setting cluster type, process is simple, and stress is clear, and speed of application is fast.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.