阅读说明：本技术 一种无伸缩缝桥梁桥台 (Bridge abutment without expansion joint ) 是由 陈宜言 代亮 董桔灿 何晓晖 王梦雨 于芳 王小花 宋华 彭曼琳 贾鹏 于 2019-12-02 设计创作，主要内容包括：本发明公开一种无伸缩缝桥梁桥台,包括上部梁体、桥墩、挡土墙、第一搭板和第二搭板,桥墩连接设置于上部梁体的底部,桥墩与挡土墙之间预留有空隙,第一块搭板的前端锚固在上部梁体上,后端放置在挡土墙后的填土上,放置在挡土墙后的填土上的第二块搭板的前端与第一块搭板相接,两块搭板相连部位下方设置垫板,且两块搭板与填土之间铺设有隔离层。本发明的无伸缩缝桥梁桥台,解决了现有技术存在的问题,能够实现上部梁体以及桥墩的大变形需要,提高桥台整体性能。(The invention discloses a bridge abutment without an expansion joint, which comprises an upper beam body, a pier, a retaining wall, a first butt strap and a second butt strap, wherein the pier is connected and arranged at the bottom of the upper beam body, a gap is reserved between the pier and the retaining wall, the front end of the first butt strap is anchored on the upper beam body, the rear end of the first butt strap is placed on filling soil behind the retaining wall, the front end of the second butt strap placed on the filling soil behind the retaining wall is connected with the first butt strap, a base plate is arranged below the connecting part of the two butt straps, and an isolation layer is laid between the two butt straps and the filling soil. The bridge abutment without the expansion joint solves the problems in the prior art, can meet the requirement of large deformation of an upper beam body and a bridge pier, and improves the overall performance of the bridge abutment.)

1. The utility model provides a no expansion joint bridge abutment which characterized in that: including upper portion roof beam body, pier, retaining wall, first strap and second strap, the pier connect set up in the bottom of the upper portion roof beam body, it has the space to reserve between pier and the retaining wall, the front end anchor of first strap is in on the upper portion roof beam body, the rear end is placed on the soil filling behind the retaining wall, place on the soil filling behind the retaining wall the front end of second strap with first strap meets, and the position below that links to each other of two straps sets up the backing plate, and has laid the isolation layer between two straps and the soil filling.

2. The bridge abutment without expansion joint of claim 1, wherein: the bridge pier and the upper beam body are connected into a whole and form a steel structure, or the bridge pier is hinged with the upper beam body through a support and is fixedly connected with the upper beam body.

3. The bridge abutment without expansion joint of claim 1, wherein: and a gap between the pier and the retaining wall can be reserved according to the deformation requirements of the upper beam body and the pier.

4. The bridge abutment without expansion joint of claim 1, wherein: the first butt strap is in a variable thickness form, the front end is thickest, and the first butt strap is gradually thinned to the rear end; the second butt strap also adopts the thickness-variable form, and the position that the front end meets with first butt strap is thinnest, thickens gradually to the tail end.

5. The bridge abutment without expansion joint of claim 1, wherein: the thickness transition mode of the two lapping plates can adopt three sections of equal thickness, variable thickness and equal thickness, and can also adopt a section of variable thickness.

6. The bridge abutment without expansion joint of claim 1, wherein: the thinnest part of the two lapping plates is larger than 20cm, and the thickest part is determined by calculation according to the reserved gap between the pier and the retaining wall.

7. The bridge abutment without expansion joint of claim 1, wherein: a clamping piece is filled between the two butt straps, and the clamping piece is made of rubber, asphalt or a spring.

8. The bridge abutment without expansion joint of claim 1, wherein: the anchoring mode between the front end of the first butt strap and the upper beam body can be connected together by anchor bolts or reinforcing steel bars.

9. The bridge abutment without expansion joint of claim 1, wherein: the isolation layer is made of geotextile.

Technical Field

The invention relates to the technical field of bridge engineering, in particular to a bridge abutment of a bridge without an expansion joint.

Background

The bridge structure can generate expansion with heat and contraction with cold under the action of temperature, and in order to meet the requirement of bridge deck deformation, bridge expansion joints are usually arranged between two adjacent beam ends and between the beam ends and a bridge abutment. Investigation finds that a large number of expansion joints are seriously damaged due to the problems of not-in-place maintenance, infirm installation, structural design defects, overloaded vehicles and the like in the bridge maintenance process, and the driving comfort and the bridge safety are influenced.

At present, in some projects, expansion joints are cancelled, and a bridge structure without the expansion joints is adopted, so that the maintenance and the replacement of the expansion joints are reduced, the durability and the seismic performance of the bridge are improved, and the bridge has a better application prospect. The existing expansion joint-free bridge mainly comprises three types, namely a whole bridge, a semi-whole bridge and an extension bridge deck, and in the existing expansion joint-free bridge technology, the temperature deformation of a bridge structure is transferred to the abutment and then filled with soil through an abutment and a butt strap, so that the method has the following problems:

1. the bridge abutment not only supports the upper bridge but also blocks the abutment and is filled with soil, when the bridge expands under heat, the abutment extrudes the filled soil, and the abutment is subjected to larger passive soil pressure; when the bridge cooling shortened, abutment and the separation of filling out soil formed the clearance, but fill out soil under the automobile load effect and be compacted extrusion abutment, the abutment receives great initiative soil pressure, and such circulation is reciprocal, and is accumulated in the month day, can cause behind the abutment filling out soil to sink or the abutment destroys two kinds of serious disease problems of deformation.

2. In order to meet the repeated deformation of the abutment under the action of temperature and traffic load, the mechanical property requirement of the filling material behind the abutment is high, the construction difficulty is high, and meanwhile, the durability problem needs to be further researched. In addition, the deviation between the soil pressure calculation parameter between the filling soil and the abutment and the actual filling soil effect is large, and the expected effect cannot be achieved.

3. The deformation of the abutment and the beam end is transferred to the end part of the butt strap through the abutment butt strap, and the defects such as bulging, fracture and the like are easily caused in the pavement at the end part of the butt strap.

4. Because the bridge abutment of the prior bridge without the expansion joint is difficult to solve the problem of large deformation, the bridge abutment can only be used in small and medium bridges, and is difficult to popularize and use in areas with severe temperature change and longer bridges.

Disclosure of Invention

The invention aims to provide a bridge abutment without an expansion joint, which aims to solve the problems in the prior art, can meet the large deformation requirement of an upper beam body and a pier and improve the overall performance of the bridge abutment.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a bridge abutment without an expansion joint, which comprises an upper beam body, a pier, a retaining wall, a first butt strap and a second butt strap, wherein the pier is connected and arranged at the bottom of the upper beam body, a gap is reserved between the pier and the retaining wall, the front end of the first butt strap is anchored on the upper beam body, the rear end of the first butt strap is placed on filling soil behind the retaining wall, the front end of the second butt strap placed on the filling soil behind the retaining wall is connected with the first butt strap, a base plate is arranged below the connecting part of the two butt straps, and an isolation layer is laid between the two butt straps and the filling soil.

Preferably, the pier and the upper beam body are connected into a whole and form a steel structure, or the pier is fixedly connected with the upper beam body through a support hinge.

Preferably, a gap between the pier and the retaining wall may be reserved according to the deformation requirements of the upper beam body and the pier.

Preferably, the first butt strap is in a variable thickness form, the front end is thickest, and the first butt strap is gradually thinned to the rear end; the second butt strap also adopts the thickness-variable form, and the position that the front end meets with first butt strap is thinnest, thickens gradually to the tail end.

Preferably, the thickness transition mode of the two lapping plates can adopt three sections of equal thickness-variable thickness-equal thickness, and can also adopt a section of variable thickness.

Preferably, the thinnest part of the two lapping plates is larger than 20cm, and the thickest part is determined by calculation according to the reserved gap between the pier and the retaining wall.

Preferably, a clamping piece is filled between the two butt straps, and the clamping piece is made of rubber, asphalt or a spring.

Preferably, the front end of the first butt strap and the upper beam body are anchored together by anchor bolts or steel bars.

Preferably, the isolation layer is made of geotextile.

Compared with the prior art, the invention has the following technical effects:

(1) the pier and the retaining wall are separated through the gap, the earth filling pressure behind the retaining wall only acts on the retaining wall, the deformation of the pier is not influenced by earth filling, meanwhile, the earth filling does not need to meet the requirement that the pier deforms to and fro and recovers, and the respective stress of the pier and the retaining wall is clear.

(2) The bridge pier and the retaining wall are separated through the gap, the large deformation requirements of the upper beam body and the bridge pier are very easy to realize, and the difficult problems that the span of the existing seamless bridge is difficult to be large and the use is limited in the area with severe temperature change are solved.

(3) The earth filled behind the retaining wall has definite stress and single function, and can meet the requirements by adopting conventional materials and conventional construction processes, and the construction method is mature and has good durability.

(4) The butt strap is arranged in a variable thickness mode, so that on one hand, the axial rigidity can be reduced, the friction force between the butt strap and the filling soil can be uniform through the isolation layer, and meanwhile, the deformation of a beam body is slowly and uniformly released into the filling soil and a pavement layer through the length of the whole butt strap by combining the buffering deformation capacity of the clamping piece, so that the problem that the pavement layer bulges or is broken due to excessive deformation of the tail part of the existing butt strap is solved; on the other hand, the two variable-thickness butt straps are combined into a shape similar to an arch ring, when the butt straps are subjected to thermal expansion and cold contraction deformation of the beam body, the radial pressure between the two variable-thickness butt straps and the filling soil is increased, the frictional resistance between the butt straps and the filling soil is improved, and the overall effect is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;

in the figure: 1. an upper beam body; 2. a bridge pier; 3. a void; 4. a retaining wall; 5. filling soil; 6. a first strap; 61. a second strap; 7. paving asphalt concrete; 8. an anchor bolt; 9. a clip; 10. an isolation layer; 11. a support; 12. a backing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a bridge abutment without an expansion joint, which aims to solve the problems in the prior art, can meet the large deformation requirement of an upper beam body and a pier and improve the overall performance of the bridge abutment.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-2, the present invention provides a bridge abutment without expansion joint, which mainly comprises an upper beam body 1, a bridge pier 2, a retaining wall 4, filling 5, a first butt strap 6, a second butt strap 61, a clamping piece 9, an isolation layer 10, a backing plate 12 and a gap 3.

As shown in fig. 1, the bridge pier 2 and the upper beam body 1 are connected to form a rigid frame, similar to the existing integral bridge without expansion joints; or as shown in fig. 2, the bridge pier 2 is hinged with the upper beam body 1 through a support 11, similar to the existing semi-integral non-expansion joint bridge.

The gap 3 is reserved between the pier 2 and the retaining wall 4, the size of the gap 3 can be reserved according to the deformation requirements of the upper beam body 1 and the pier 2, the maximum value of the deformation of the upper beam body 1 can only reach 30mm due to the interaction between filling soil and the abutment in the existing bridge without the expansion joint, and the deformation of the upper beam body 1 can reach 100mm or even more.

First butt strap 6 front end anchor is on upper portion roof beam body 1, and on the back end was placed the filling 5 behind retaining wall 4, first butt strap 6 adopted the thickness of change form, and the front end is thickest, attenuate gradually to the rear end, and second butt strap 61 links to each other with first butt strap 6 through crab-bolt 8, packs clamping piece 9 between two butt straps. The second butt strap 61 also adopts a variable thickness form, the connecting part of the front end and the first butt strap 6 is thinnest, and the thickness is gradually increased to the tail end; a backing plate 12 is arranged below the connecting part of the two butt straps; an isolation layer 10 is laid between the first butt strap 6, the second butt strap 61 and the filling 5.

The butt strap adopts a variable thickness form, the front end is thickest, and the butt strap is gradually thinned to the rear end; the second butt strap 61 is connected with the first butt strap 6 through an anchor bolt, a clamping piece 9 is filled between the two butt straps, the second butt strap 61 also adopts a thickness-variable mode, the connecting part of the front end and the first butt strap 6 is thinnest, and the thickness is gradually increased to the tail end; a backing plate 12 is arranged below the connecting part of the two butt straps; an isolation layer 10 is laid between the butt strap and the filling 5. The thickness transition mode of the two lapping plates can adopt three sections of equal thickness → variable thickness → equal thickness, and can also adopt a section of variable thickness. The thinnest part of the butt strap is larger than 20cm, the thickest part is calculated and determined according to the reserved gap 3 between the pier 2 and the retaining wall 4 and is generally smaller than 50cm, and the thickness change adopts a linear transition mode.

The clamping piece 9 can be made of high-elasticity materials such as rubber, asphalt, springs and the like, and is easy to compress and deform. The front end of the first butt strap 6 and the beam body can be connected together in an anchoring mode through anchor bolts or reinforcing steel bars. The length of the anchor bolt is set according to the stress requirement, the length of the anchor bolt embedded into the butt strap is generally more than 10 times of the diameter of the anchor bolt, and the exposed part of the anchor bolt needs to be coated with anticorrosive materials such as epoxy or asphalt.

The isolation layer 10 can be made of materials such as geotextile, and the like, so that the aim of uniformly distributing the friction force between the butt strap and the filling 5 is fulfilled.

The invention relates to a bridge abutment without expansion joints, which mainly comprises the following steps:

the first step, pier 2 construction, according to the deformation needs of pier 2, reserve good space 3, but synchronous construction retaining wall 4.

And secondly, constructing the upper beam body 1, synchronously constructing the filling 5 at the rear part of the retaining wall 4, and compacting the filling 5 layer by layer.

And thirdly, paving an isolation layer 10 and a construction backing plate 12 on the filled soil 5.

And fourthly, constructing the butt straps 6 and 61, anchoring the first butt strap 6 on the beam body 1, connecting the first butt strap 6 with the second butt strap 61 through an anchor bolt 8, and filling the clamping piece 9 between the two butt straps.

And fifthly, constructing asphalt concrete pavement 7 to finish construction.

The above-described embodiment is only one specific example of the invention, which may take numerous alternatives within the scope of the appended claims. The pier 2 in the above embodiment may be a rectangular plate wall, or may be a plurality of cylindrical or square columnar piers; the first butt strap 6 of the above embodiment may be anchored to the pier 2; in the embodiment, a third butt strap can be added according to the deformation requirement; the beam body 1, the pier 2, the retaining wall 4, and the butt plates 6 and 61 of the above embodiments may be of a precast concrete structure or a cast-in-place concrete structure or a steel-concrete composite structure or a steel structure, and the retaining wall 4 may be of a masonry structure.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.