CN209873558U - Expansion joint structure of connecting plate-abutment back wall combination - Google Patents
Expansion joint structure of connecting plate-abutment back wall combination Download PDFInfo
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- CN209873558U CN209873558U CN201920399599.9U CN201920399599U CN209873558U CN 209873558 U CN209873558 U CN 209873558U CN 201920399599 U CN201920399599 U CN 201920399599U CN 209873558 U CN209873558 U CN 209873558U
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Abstract
The utility model relates to an expansion joint structure of connecting plate-abutment back wall combination, including abutment platform body, the top of abutment platform body is supported and is provided with the girder, the upper surface of girder is provided with the decking, the tip of girder is provided with the butt joint plate body that is located abutment platform body top, through reinforcing bar, ultra high performance concrete connection phase interconnect between the horizontal segment tip of butt joint plate body and the decking tip, through reinforcing bar, ultra high performance concrete connection phase interconnect between the vertical segment tip of butt joint plate body and abutment platform body. The expansion joint structure of the connecting plate-abutment back wall combination is simple in structure.
Description
Technical Field
The utility model relates to an expansion joint structure of connecting plate-abutment back wall combination.
Background
The jumping caused by the expansion joints of the bridge and the secondary adverse effects (such as additional internal force of the structure, corrosion of the structure caused by water leakage and the like) caused by the damage of the expansion joints are troublesome problems which are often encountered in the actual operation of the bridge at home and abroad at present. The jumping caused by the telescopic device not only causes great impact on the bridge, but also reduces the driving comfort of drivers and passengers. In addition, with the increasing of the traffic flow, the maintenance and replacement of the expansion joint device often cause serious traffic interruption, and further generate huge economic loss. Therefore, a series of problems brought by the bridge expansion joint are inevitable. At present, the expansion joint solving problem generally has the following two ideas: firstly, an improved telescopic device. At present, the types of the telescopic devices are many, the service life of the telescopic devices is generally less than 5 years, but the problems of maintenance and replacement of the telescopic devices are not completely solved by improving the telescopic devices, so the improvement of the telescopic devices is not a permanent cure. And secondly, the problem of the expansion device is solved fundamentally, and the expansion device of the bridge deck is reduced or the expansion device of the bridge is eliminated. The expansion joint-free bridge adopting the extended bridge deck abutment (hereinafter referred to as an extended bridge deck slab bridge) is produced at the same time. An expansion joint is arranged between a main beam of the extended bridge deck abutment and the abutment so as to adapt to the requirement of expansion deformation of the main beam, the earth pressure behind the abutment is borne by the abutment back wall, and the main beam is not borne; the bridge deck extends backwards to the abutment and is connected with the guide plate, spans and covers an expansion joint between the main beam and the abutment, and the expansion device is omitted; and the extending bridge deck covering the expansion joint is called a connecting plate. The bridge deck expansion device can be cancelled in the case of extending the bridge deck slab bridge without changing the vertical simply supported stress of the main girder, the vertical stress and deformation characteristics of the upper structure are close to those of the conventional bridge with the expansion joint, and the bridge deck slab bridge is easy to accept by engineers; the structure is simple, and the construction is convenient; and the expansion device is not arranged, so that the construction, maintenance and repair cost of the expansion device is saved, the driving stability is improved, and the impact load of a driving on a bridge is reduced. Because the expansion device between the abutment back wall and the main beam is cancelled, the expansion amount of the beam body generated by temperature deformation, concrete shrinkage and creep and the like is absorbed by the combined structure of the connecting plate and the abutment back wall. The temperature expansion and contraction deformation of the main beam is not transmitted to the lower structure, so that the adverse influence on the main beam caused by the complex structure-soil interaction and the internal force generated by the restrained deformation is avoided. Compared with other types of bridges without expansion joints, the extension bridge deck slab bridge has longer construction length; the requirements on the lower structure, the soil behind the platform and the soil around the pile are lower, and the application range is wider; the method is not only suitable for newly built bridges, but also suitable for seamless reconstruction of existing bridges, in particular to existing bridges with lower structure drawings lacking or unknown geological data.
The connecting plate and abutment back wall combined structure is a weak link for extending a bridge deck slab bridge structure. In terms of structure, the main beam is a simply supported beam, one end of the connecting plate at the bridge abutment of the extended bridge deck is connected with the main beam, the other end of the connecting plate is connected with the back wall of the bridge abutment and the filling soil is filled behind the bridge abutment, namely, the rigidity of the components connected at the two ends is asymmetric, and the stress condition is more complex. At present, the expansion joint and the expansion device are cancelled by a large number of continuous beams at the bridge pier, the expansion and contraction deformation of the main beam due to temperature is transmitted to the bridge abutment more, and the damage to the expansion device at the bridge abutment is easier to cause. The connecting plate is located the rigidity sudden change department of superstructure, not only will bear the girder temperature breathing deformation transmission and the longitudinal axle that comes to warp, still need bear the girder tip that vertical loads such as car produced and rotate the concentrated power and the impact of deformation and wheel, and the atress is complicated, and design, construction and maintenance are improper, all can cause the fracture. Because the tie plate is affected by the negative bending moment, the tie plate concrete must crack when there are not enough longitudinal rebars designed to bear the upper vehicle impact load. With the increase of the service time, diseases such as fragmentation and local pit and the like can be even developed, so that the smoothness of the bridge deck is damaged, and rainwater can infiltrate into the support, the cover beam and the like to cause the corrosion of reinforcing steel bars inside the bridge abutment and the freeze-thaw damage of concrete.
SUMMERY OF THE UTILITY MODEL
In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an expansion joint structure of a connection plate-abutment back wall combination.
In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides an expansion joint structure of connecting plate-abutment back wall combination, includes the abutment platform body, the top of abutment platform body is supported and is provided with the girder, the upper surface of girder is provided with the decking, the tip of girder is provided with the butt joint plate body that is located abutment platform body top, through reinforcing bar, ultra high performance concrete linkage section interconnect between the horizontal segment tip of butt joint plate body and the decking tip, through reinforcing bar, ultra high performance concrete linkage section interconnect between the vertical segment tip of butt joint plate body and the abutment platform body.
Preferably, a support for supporting is arranged between the main beam and the abutment body.
Preferably, the deck plate end and the girder end have a spacing therebetween, and an upper surface of the girder in the spacing forms a support plane for supporting the horizontal section of the docking plate body.
Preferably, the butt-joint plate body is of an L-shaped structure which is formed by a horizontal ultra-high performance concrete connecting plate and a vertical ultra-high performance concrete bridge abutment back wall.
Preferably, the horizontal segment tip of butt joint plate body, vertical section tip all have first reinforcing bar to outwards extend, and decking tip, abutment platform upper surface all outwards extend to have and are used for with first reinforcing bar welded second reinforcing bar mutually.
Preferably, an unbonded layer is arranged between the horizontal section of the butt joint plate body and the supporting plane and is also positioned below the ultra-high performance concrete connecting section of the horizontal section of the butt joint plate body.
Compared with the prior art, the utility model discloses following beneficial effect has: the expansion joint structure of the connecting plate-abutment back wall combination is simple in structure, and the tensile, bending and crack resistance of the ultra-high performance concrete connecting section are utilized to ensure that the connecting plate-abutment back wall combination structure at the main beam-abutment joint does not crack under the longitudinal bridge action of temperature change, concrete shrinkage and creep and the like, the rotation deformation of the end part of the main beam generated by vertical loads of automobiles and the like, and the concentrated force and impact action of wheels; the compactness and the low porosity of the ultra-high performance concrete are used for preventing moisture from permeating into the connecting plate-abutment back wall combined structure; the corrosion resistance is improved, and the service life of the structure is prolonged.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of a construction state according to an embodiment of the present invention.
Fig. 3 is a schematic view of a construction state according to an embodiment of the present invention.
Fig. 4 is a third schematic view of a construction state according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 ~ 4, an expansion joint structure of connecting plate-abutment back wall combination, includes abutment platform body 1, the top support of abutment platform body is provided with girder 2, the upper surface of girder is provided with decking 3, the tip of girder is provided with the butt joint plate body that is located abutment platform body top, through reinforcing bar, 4 interconnect of ultra high performance concrete linkage section between the horizontal segment tip of butt joint plate body and the decking tip, through reinforcing bar, ultra high performance concrete linkage section interconnect between the vertical segment tip of butt joint plate body and the abutment platform body.
In the embodiment of the present invention, a support 5 is provided between the main beam and the abutment body.
In an embodiment of the present invention, an interval is provided between the bridge deck end portion and the girder end portion, and a supporting plane for supporting the horizontal section of the docking plate body is formed on the girder upper surface in the interval.
In the embodiment of the present invention, the butt-joint plate body is an integrated "L" shaped structure composed of a horizontal ultra-high performance concrete connecting plate 6 and a vertical ultra-high performance concrete abutment back wall 7.
The embodiment of the utility model provides an in, the horizontal segment tip of butt joint plate body, vertical section tip all have first reinforcing bar 8 towards extending outward, and decking tip, abutment platform upper surface all have outwards extend be used for with first reinforcing bar welded second reinforcing bar 9 mutually.
The embodiment of the utility model provides an in, be provided with between the horizontal segment of the butt joint plate body and the supporting plane and not have adhesive layer 10, do not have adhesive layer and also be located the ultra high performance concrete linkage segment below of butt joint plate body horizontal segment, do not have adhesive layer and generally be rubber materials.
A construction method of an expansion joint structure of a connecting plate-abutment back wall combination is carried out according to the following steps: (1) the butt-joint plate body combined by the ultra-high performance concrete connecting plate and the abutment back wall is prefabricated and is subjected to high-temperature pressure steam curing, the curing time is ensured not to be less than 15 days so as to ensure the early shrinkage and creep completion of the ultra-high performance concrete, the end parts of the horizontal section and the vertical section of the butt-joint plate body are both embedded with extending reinforcing steel bars, and the extending lengths of the reinforcing steel bars meet the welding connection requirement; (2) the method comprises the following steps of prefabricating or casting a main beam, a bridge deck and a bridge abutment body in situ by adopting common concrete, extending reinforcing steel bars out of the end part of the bridge deck along the longitudinal bridge direction, and extending the reinforcing steel bars out of the upper surface of the bridge abutment body along the vertical direction; (3) arranging a support on the abutment body, and placing a main beam on the support; (4) arranging an unbonded layer on the upper surface of the main beam; (5) conveying the ultra-high performance concrete connecting plate-abutment back wall combination to a construction site by a traditional conveying mode, and placing a horizontal section above an unbonded layer to ensure that the extending reinforcing steel bars on the two end surfaces of the ultra-high performance concrete connecting plate-abutment back wall combination are respectively positioned at weldable and connected positions with the extending reinforcing steel bars on the end part of the bridge deck along the longitudinal bridge direction and the vertical extending reinforcing steel bars on the upper surface of the abutment body, and welding; (6) and (3) casting the ultra-high performance concrete connecting section in situ, and combining the ultra-high performance concrete connecting plate-abutment back wall combination with the bridge deck of the main beam and the abutment body to form an integral structure. The tensile, bending and crack resistance of the ultra-high performance concrete connecting section is utilized to ensure that the connecting plate-abutment back wall combined structure at the main beam-abutment node does not generate cracks under the longitudinal bridge action of temperature change, concrete shrinkage and creep and the like, the main beam end rotating deformation generated by vertical loads of automobiles and the like, and the concentrated force and impact action of wheels; the characteristics of compactness and low porosity of the ultra-high performance concrete are used for preventing moisture from permeating into the connecting plate-abutment back wall combined structure; the water in the filling soil behind the abutment is prevented from entering the concrete of the abutment back wall to cause the damage of the expanded rust of the reinforcing steel bar, the anti-corrosion performance of the reinforcing steel bar is improved, and the service life of the structure is prolonged.
In the embodiment of the present invention, in step (5), before the steel bar welding of the abutment back wall end and the abutment body, the temporary support 11 needs to be set between the abutment back wall end and the abutment body for temporary support.
The present invention is not limited to the above preferred embodiments, and any person can obtain the expansion joint structure of the connection plate-abutment back wall combination in other various forms according to the teaching of the present invention. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (6)
1. The utility model provides an expansion joint structure of connecting plate-abutment back wall combination, includes the abutment stage body, the top support of abutment stage body is provided with the girder, the upper surface of girder is provided with decking, its characterized in that: the tip of girder is provided with the butt joint plate body that is located abutment platform body top, through reinforcing bar, ultra high performance concrete linkage segment interconnect between the horizontal segment tip of butt joint plate body and the decking tip, through reinforcing bar, ultra high performance concrete linkage segment interconnect between the vertical segment tip of butt joint plate body and the abutment platform body.
2. The expansion joint structure of the connection plate-abutment back wall combination according to claim 1, wherein: and a support for supporting is arranged between the main beam and the abutment body.
3. The expansion joint structure of the connection plate-abutment back wall combination according to claim 1, wherein: a space is formed between the end part of the bridge deck and the end part of the main beam, and the upper surface of the main beam in the space forms a supporting plane for supporting the horizontal section of the butt-joint plate body.
4. The expansion joint structure of the connection plate-abutment back wall combination according to claim 1, wherein: the butt-joint plate body is of an L-shaped structure which is formed by a horizontal ultra-high performance concrete connecting plate and a vertical ultra-high performance concrete bridge abutment back wall.
5. The expansion joint structure of the connection plate-abutment back wall combination according to claim 1, wherein: the horizontal segment tip of butt joint plate body, vertical section tip all have first reinforcing bar towards extending outward, and decking tip, abutment platform body upper surface all have outwards extend be used for with first reinforcing bar welded second reinforcing bar mutually.
6. The expansion joint structure of the connection plate-abutment back wall combination as claimed in claim 3, wherein: an unbonded layer is arranged between the horizontal section of the butt-joint plate body and the supporting plane and is also positioned below the ultra-high performance concrete connecting section of the horizontal section of the butt-joint plate body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920399599.9U CN209873558U (en) | 2019-03-27 | 2019-03-27 | Expansion joint structure of connecting plate-abutment back wall combination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920399599.9U CN209873558U (en) | 2019-03-27 | 2019-03-27 | Expansion joint structure of connecting plate-abutment back wall combination |
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| CN209873558U true CN209873558U (en) | 2019-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109853376A (en) * | 2019-03-27 | 2019-06-07 | 福州大学 | A kind of expansion joint structure and its construction method of connecting plate-abutment parados combination |
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2019
- 2019-03-27 CN CN201920399599.9U patent/CN209873558U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109853376A (en) * | 2019-03-27 | 2019-06-07 | 福州大学 | A kind of expansion joint structure and its construction method of connecting plate-abutment parados combination |
| CN109853376B (en) * | 2019-03-27 | 2023-12-08 | 福州大学 | Expansion joint structure of connecting plate-abutment back wall combination and construction method thereof |
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