CN213571504U - Bridge head butt strap structure and bridge structure - Google Patents

Bridge head butt strap structure and bridge structure Download PDF

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Publication number
CN213571504U
CN213571504U CN202021688779.8U CN202021688779U CN213571504U CN 213571504 U CN213571504 U CN 213571504U CN 202021688779 U CN202021688779 U CN 202021688779U CN 213571504 U CN213571504 U CN 213571504U
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plate
bridge
strap
drainage
transition
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CN202021688779.8U
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Chinese (zh)
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孙全利
刘春峥
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Guangzhou Urban Planning Survey and Design Institute
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Guangzhou Urban Planning Survey and Design Institute
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Abstract

The utility model relates to a bridge engineering technical field discloses a bridgehead attachment strap structure. The first end of the butt strap extends to the end of the main beam and is poured together with the main beam through a reinforced concrete structure, the lower portion of the first end of the butt strap is connected with the top of the abutment through a sliding facility, and the drainage structure and the first filling structure are sequentially arranged from top to bottom below the butt strap. The utility model also provides a bridge structures. Has the advantages that: the utility model discloses an adopt reinforced concrete fixed connection between girder and the attachment strap, cancelled simultaneously between attachment strap and the girder and the gap between attachment strap and the platform back of the body to laid drainage structures under the attachment strap structure, can avoid the rainwater infiltration from this, thereby reduced attachment strap fracture and sunken probability. And the sliding facilities ensure the need of longitudinal deformation of the bridge.

Description

Bridge head butt strap structure and bridge structure
Technical Field
The utility model relates to a bridge engineering technical field especially relates to a bridgehead attachment strap structure and bridge structures.
Background
The bridge end butt strap is a structural measure taken to prevent the bridge end connection portion from settling. It rests between the abutment or cantilever slab end and the fill and is able to rotate as the fill settles. The vehicle can play a role in buffering when running, so that the land filling settlement is not easy to generate unevenness. At present, bridge head butt straps are basically of cast-in-place reinforced concrete structures, and the thickness of the butt strap is more than 25 cm-35 cm and the length of the butt strap is more than 5 m-10 m according to the difference of the filling thickness and the load condition of an abutment, backfill materials behind the abutment and the like.
The traditional bridge head butt strap often causes a series of hazards due to the fact that the platform back filler is not compact and the rigidity of the traditional bridge head butt strap is not uniform in transition, for example, the butt strap sinks to cause pavement cracking, vehicle jumping and the like, safety and comfort are affected, the service life of a road and a bridge is also shortened, and transportation cost and maintenance cost are increased. In addition, most of the near-platform end of the bridge end butt strap is arranged below the asphalt concrete surface layer or is level with the top surface of the pavement base, vehicle load is quickly transmitted to the roadbed, rainwater seeps from the expansion joint at the joint, so that the filling water and soil loss is caused to settle the embankment, the butt strap is hollowed, the butt strap is changed into a bending structure, and the hollowed part is easy to crack. In high-speed driving, the crack is increased, and simultaneously, drivers and passengers feel uncomfortable jolt, and even traffic accidents are easily caused in severe cases. In view of this, the solution to the cracking problem is of great social significance.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the existing bridge head butt strap structure is easy to cause the soil filled below the structure to lose water and soil, so that the butt strap sinks or cracks.
In order to solve the above problem, the utility model provides a technical scheme:
the utility model provides a bridge head attachment strap structure, its is used for with the girder overlap joint, including attachment strap layer, drainage structures and first fill out native structure, the first end of attachment strap extends to the tip of girder and pours together through reinforced concrete, the first end below of attachment strap links to each other with the top of abutment through sliding the facility, the below of attachment strap be equipped with drainage structures and first fill out native structure in proper order.
The bridge head butt strap structure comprises a top plate, a transition plate and a bottom plate which are sequentially connected, wherein the bottom plate is located below the top plate in an inclined mode, the transition plate is of an inclined structure, two ends of the transition plate are respectively connected with the top plate and the bottom plate, the top plate, the transition plate and the bottom plate integrally form a step structure, and a second filling structure is back filled above the transition plate and the bottom plate.
The bridge head butt strap structure is characterized in that the cross section of the butt strap is equal in thickness or variable in thickness along the longitudinal direction of the bridge.
The bridge head butt strap structure is characterized in that an expansion gap is formed between the top plate and the transition plate, and the top plate and the transition plate are connected through a dowel bar.
The bridge head butt strap structure is characterized in that an expansion gap is formed between the transition plate and the bottom plate, and the transition plate is connected with the bottom plate through a dowel bar.
In the bridge head butt strap structure, the dowel bar comprises a sleeve and a pull rod, one end of the pull rod is arranged in the sleeve in a pluggable manner, a gap is formed between the pull rod and the sleeve, and a buffer material is filled in the gap;
the sleeve is fixed on the top plate, and the pull rod is fixed on the transition plate;
or the sleeve is fixed on the transition plate, and the pull rod is fixed on the top plate;
or the sleeve is fixed on the transition plate, and the pull rod is fixed on the bottom plate;
or the sleeve is fixed on the bottom plate, and the pull rod is fixed on the transition plate.
The bridge head butt strap structure, drainage structure includes rubble bed course and the clay water barrier that top-down set up, the tail end of clay water barrier is equipped with the drainage french drain.
The bridge head butt strap structure is characterized in that the drainage blind ditch is arranged along the width direction of the butt strap.
The bridge head butt strap structure, the drainage structures including locate roof below first drainage structures, locate cross cab apron below second drainage structures and locate the third drainage structures of bottom plate below, first drainage structures, second drainage structures and the slope of third drainage structures all is more than 0.3%.
In order to solve the same technical problem, the utility model also provides a bridge structure, it includes girder, abutment and foretell bridgehead attachment strap structure.
The utility model discloses a bridgehead attachment strap structure and bridge structures, compared with the prior art, its beneficial effect lies in:
(1) the main beam and the butt strap are fixedly connected by adopting reinforced concrete, simultaneously, a gap between the butt strap and the main beam and a gap between the butt strap and the table back are eliminated, and a drainage structure is laid under the butt strap structure, so that rainwater can be prevented from permeating downwards, and the probability of cracking and sinking of the butt strap is reduced. And the sliding facilities ensure the need of longitudinal deformation of the bridge.
(2) The butt strap can be composed of a traditional butt strap, and also can be composed of a top plate, a transition plate, a bottom plate and some accessory components, so that the functions of the original butt strap are kept, the uniform transition of the rigidity of the butt strap is realized, and the road surface cracking caused by the rapid change of the rigidity of the tail end of the traditional butt strap is avoided. The bottom plate plays a role of a sleeper beam, and the phenomenon of vehicle jumping caused by partial subgrade settlement is avoided.
(3) And the top plate, the transition plate and the bottom plate can be connected by a dowel bar matched expansion joint, and the connection mode among the butt strap structures can ensure the longitudinal free deformation of the butt strap top plate, so that the pavement cracking caused by the stress concentration and upward reflection is avoided.
(4) The drainage structure can adopt top-down to set up rubble bed course and clay water barrier, sets up the french drain simultaneously at clay water barrier afterbody end. The gravel cushion layer can also have the function of drainage, and can drain external water seepage and leakage into the drainage blind ditch at the tail end of the bottom plate along the longitudinal direction. The clay water-resisting layer or other material water-resisting layers are arranged below the gravel cushion layer, so that external water is prevented from further permeating downwards, and water in the gravel cushion layer can be better collected into the drainage blind ditch.
(5) The structure can be cast in place and prefabricated in factories.
Drawings
FIG. 1 is a schematic view of an abutment structure;
fig. 2 is a schematic structural diagram of a dowel bar.
In the figure, 1, a main beam; 2. a reinforced concrete structure; 3. a sliding facility; 4. a butt strap; 41. a top plate; 42. a transition plate; 43. a base plate; 5. a dowel bar; 51. raw wood; 52. a sleeve; 53. a pull rod; 54. foam plastic fragments; 55. putty fillers; 6. expanding the seam; 7. a drainage structure; 71. a first drainage structure; 711. a first gravel cushion layer; 712. a first clay water barrier; 72 a second drainage structure; 721. a second gravel cushion layer; 722. a second clay water barrier; 73. a third drainage structure; 731. a third gravel cushion layer; 732. a third clay water barrier; 733. blind ditches; 8. a support; 9. an abutment; 10. a first fill structure; 11. a second fill structure;
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in fig. 1, the bridge head access plate structure of the embodiment is used for being overlapped with a main beam 1, and is characterized by comprising an access plate 4, a drainage structure 7 and a first filling structure 10, wherein a first end of the access plate 4 extends to the end part of the main beam 1 and is poured together through a reinforced concrete structure 2, a first end of the access plate 4 is connected with the top of a bridge abutment 9 through a sliding facility 3 below, and the drainage structure 7 and the first filling structure 10 are sequentially arranged below the access plate 4. The bridge head butt strap structure is directly fixedly connected with the main beam 1 through the reinforced concrete structure 2, meanwhile, a gap between the butt strap 4 and the main beam 1 and a gap between the butt strap 4 and a bridge abutment 9 back wall are eliminated, and the drainage structure 7 is arranged, so that the probability of corresponding pavement cracking is reduced. The sliding means 3 is arranged to meet the requirement of longitudinal deformation of the bridge (the longitudinal direction is indicated by the double-headed arrow in fig. 1). It should be noted that the sliding device 3 may be a sliding support, a spring structure, or a matching structure of lubricating oil and a sliding plate, and the sliding device 3 is an existing device and will not be described herein again.
Based on the technical scheme, the main beam 1 is fixedly connected with the access board 4 through the reinforced concrete structure 2, meanwhile, gaps between the access board 4 and the main beam 1 and gaps between the access board 4 and a back wall of the bridge abutment 9 are eliminated, the drainage structure 7 is laid below the access board 4, rainwater is prevented from permeating downwards, and therefore the probability of cracking and sinking of the access board 4 is reduced.
In order to reinforce the structural strength of the butt strap 4 and further avoid the butt strap 4 from sinking under pressure, the butt strap 4 of the present embodiment includes a top plate 41, a transition plate 42 and a bottom plate 43 connected in sequence, the bottom plate 43 is located obliquely below the top plate, the transition plate 42 is an inclined structure, two ends of the transition plate 42 are respectively connected to the top plate 41 and the bottom plate 43, so that the top plate 41, the transition plate 42 and the bottom plate 43 form a step structure as a whole, and the second soil filling structure 11 is back filled above the transition plate 42 and the bottom plate 43, so that a part of the pressure of the top plate 41 can be transmitted to the transition plate 42 and the bottom plate 43 under the condition of load pressure, and further the pressure borne by the top plate 41 is dispersed, so that the structural rigidity of the whole butt strap 4 is uniform, and the whole butt strap 4 is prevented from deforming under pressure and even sinking under pressure. Of course, the strap 4 of the present embodiment may also be a strap 4 structure that is generally planar.
Preferably, the cross section of the butt strap along the longitudinal direction of the bridge (i.e. the direction of the double-headed arrow in fig. 1) can be made into an equal thickness (i.e. a cross section with equal thickness) or a variable thickness (which varies with the thickness and thus the cross section area, for example, the cross section thickness becomes smaller or larger) so as to better realize uniform transition of rigidity.
In order to avoid the cracking of the butt strap 4 or the road surface caused by the stress concentration on the butt strap 4 structure, an expansion gap 6 is arranged between the top plate 41 and the transition plate 42, and the top plate 41 and the transition plate 42 are connected through a dowel bar 5. This ensures free longitudinal deformation of the top plate 41. Preferably, the transition plate 42 and the bottom plate 43 can also be provided with expansion joints 6, which are connected by a dowel bar 5.
Preferably, as shown in fig. 2, in order to improve the force transmission effect, the force transmission rod 5 of the present embodiment may include a sleeve 52 and a pull rod 53, wherein one end of the pull rod 53 is removably disposed in the sleeve 52 with a gap between the pull rod and the sleeve 52, and the gap is filled with a buffer material. The sleeve 52 may be fixed to the top plate 41 and the pull rod 53 fixed to the transition plate 42, or the sleeve 52 may be fixed to the transition plate 42 and the pull rod 53 fixed to the top plate 41. Likewise, for the connection of the transition plate 42 and the base plate 43 there may be: the sleeve 52 is fixed on the transition plate 42 and the pull rod 53 is fixed on the bottom plate 43, or the sleeve 52 is fixed on the bottom plate 43 and the pull rod 53 is fixed on the transition plate 42. The cushioning material includes at least one of logs 51, foam crumbs 54 and putty fillers 55. In this embodiment, the sleeve 52 is preferably a metal sleeve, the tie rod 53 is plain round steel, and the cushioning material comprises a log 51, foam pieces 54 and putty filler 55, wherein the putty filler 55 is filled in the gap between the side surfaces of the sleeve 52 and the tie rod 53, and the log 51 and the foam pieces 54 are filled in the gap between the inner ends of the sleeve 52 and the tie rod 53.
In order to make the drainage structure 7 have a better waterproof effect, so as to avoid the situation that the site water and soil loss causes the cracking of the butt strap 4, etc., the drainage structure 7 may be provided with a first gravel cushion layer 711, a second gravel cushion layer 721, a third gravel cushion layer 731, a first clay water-resisting layer 712, a second clay water-resisting layer 722 and a third clay water-resisting layer 732 from top to bottom, and the tail end of the third clay water-resisting layer 732 (i.e., the lowest end of the drainage structure 7) is provided with a drainage blind ditch 733. The gravel cushion layer can also have a drainage function, and can drain external seepage water into the drainage blind ditch 733 at the tail end of the third clay water-resisting layer 732 along the longitudinal direction. Of course, in this embodiment, a water-impermeable material may be used instead of the first clay water-barrier layer 712, the second clay water-barrier layer 722 and the third clay water-barrier layer 732, such as a plastic layer, a dense non-woven fabric layer, etc.
Preferably, the drainage blind 733 is formed along the width of the structure of the panel 4 for easy drainage.
Preferably, the drainage structure 7 includes a first drainage structure 71 disposed below the top plate 41, a second drainage structure 72 disposed below the transition plate 42, and a third drainage structure 73 disposed below the bottom plate 43, and the slopes of the first, second, and third drainage structures 71, 72, and 73 are all above 0.3%, so that external seepage water is better drained to the blind ditch 733.
Preferably, in practical applications, the length of the top plate 41, the length of the transition plate 42, the length of the bottom plate 43 and the inclination angle of the transition plate 42 may be adjusted according to the conditions of the bridge, the properties of the first filling structure 10 or the second filling structure 11, the foundation conditions thereof, and the like.
The utility model also provides a bridge structure, it includes girder 1, abutment 9 and foretell bridgehead attachment strap structure.
To sum up, the embodiment of the utility model provides a bridgehead attachment strap structure and bridge structures, its structure has beneficial effect than traditional structure: the probability of cracking and sinking of the butt strap is low, and the defects of subgrade settlement caused by water seepage and the like are prevented by measures such as water prevention, drainage and the like, so that the phenomenon of vehicle jumping is avoided. The structure can be used for cast-in-place construction, can also be prefabricated in factories, and is high in production efficiency.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (10)

1. The bridge head butt strap structure is used for being in lap joint with a main beam and is characterized by comprising a butt strap, a drainage structure and a first filling structure, wherein the first end of the butt strap extends to the end part of the main beam and is poured together with the main beam through a reinforced concrete structure, the lower part of the first end of the butt strap is connected with the top of a bridge abutment through a sliding facility, and the drainage structure and the first filling structure are sequentially arranged from top to bottom below the butt strap.
2. The bridge head lapping plate structure of claim 1, wherein the lapping plate comprises a top plate, a transition plate and a bottom plate which are connected in sequence, the bottom plate is positioned obliquely below the top plate, the transition plate is of an inclined structure, two ends of the transition plate are respectively connected with the top plate and the bottom plate, the top plate, the transition plate and the bottom plate are integrally formed into a step structure, and a second filling structure is backfilled above the transition plate and the bottom plate.
3. The bridge head strap structure according to claim 1 or 2, wherein the strap has a cross section of an equal thickness or a variable thickness along the longitudinal direction of the bridge.
4. The bridge head strap structure of claim 2 wherein the top plate and the transition plate have an expansion joint therebetween and are connected by a dowel.
5. The bridge head strap structure of claim 2 wherein the transition plate and the base plate have an expansion gap therebetween, and the transition plate and the base plate are connected by a dowel.
6. The bridge head strap structure according to claim 4 or 5, wherein the dowel bar comprises a sleeve and a pull rod, one end of the pull rod is arranged in the sleeve in a pluggable manner, a gap is formed between the pull rod and the sleeve, and the gap is filled with a buffer material;
the sleeve is fixed on the top plate, and the pull rod is fixed on the transition plate;
or the sleeve is fixed on the transition plate, and the pull rod is fixed on the top plate;
or the sleeve is fixed on the transition plate, and the pull rod is fixed on the bottom plate;
or the sleeve is fixed on the bottom plate, and the pull rod is fixed on the transition plate.
7. The bridge end strap structure of claim 1, wherein the drainage structure comprises a gravel cushion layer and a clay water-resisting layer arranged from top to bottom, and a drainage blind ditch is arranged at the tail end of the clay water-resisting layer.
8. The bridge end access structure of claim 7, wherein the drainage blind ditch is provided along the access width direction.
9. The bridge head strap structure of claim 2, wherein the drainage structure comprises a first drainage structure disposed below the top plate, a second drainage structure disposed below the transition plate, and a third drainage structure disposed below the bottom plate, and the slopes of the first, second, and third drainage structures are all above 0.3%.
10. A bridge construction comprising a main beam, an abutment and a bridge end strap arrangement as claimed in any one of claims 1 to 9.
CN202021688779.8U 2020-08-13 2020-08-13 Bridge head butt strap structure and bridge structure Active CN213571504U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021688779.8U CN213571504U (en) 2020-08-13 2020-08-13 Bridge head butt strap structure and bridge structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021688779.8U CN213571504U (en) 2020-08-13 2020-08-13 Bridge head butt strap structure and bridge structure

Publications (1)

Publication Number Publication Date
CN213571504U true CN213571504U (en) 2021-06-29

Family

ID=76554961

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021688779.8U Active CN213571504U (en) 2020-08-13 2020-08-13 Bridge head butt strap structure and bridge structure

Country Status (1)

Country Link
CN (1) CN213571504U (en)

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