Patent Application
20250198097
The present invention relates to a field of bridge expansion and contraction devices, and in particular to a bridge expansion and contraction device and an installation method therefor.
The creep of bridges resulted from vehicle load, bridge material and temperature during their operation, wind force action and other factors cause bridge shrinkage and stretching deformation. Expansion and contraction devices, as one of important functional members of bridges, are usually mounted between different beams and between a beam and an abutment, in order to deal with bridge deformation. In order to ensure safe and smooth running of vehicles, the expansion and contraction devices mounted on the bridges have to meet the variability of the bridge beams. The conventional comb-plate-formed expansion and contraction joints are complicated and difficult in their site adjustment and mounting although they can meet the expansion and contraction, displacement and other requirements of the bridge beams. Moreover, the comb plates of the existing expansion and contraction devices are all connected by bolts, so that a plurality of bolt holes formed on the plate surfaces leads to high noise when vehicles run. Furthermore, it is difficult to adjust the flatness between the expansion and contraction devices and the bridge floor. In conclusion, it is necessary to improve the existing bridge expansion and contraction devices, and also the existing installation methods of bridge expansion and contraction devices.
It is a first object of the present invention to provide a bridge expansion and contraction device which is adjustable in its height when the device is mounted at a bridge construction site and can be mounted without any bolt.
It is a second object of the present invention to provide a convenient and quick installation method for the bridge expansion and contraction device when the device is mounted at a bridge construction site.
For achieving the first object, the bridge expansion and contraction device, which is disposed between an end of a first beam and an end of a second beam, comprise a gap crossing plate connected to the first beam and crossing over a gap between the first beam and the second beam; a fixed plate being engaged with the gap crossing plate and connected to the second beam; one or more height adjustment assemblies; one or more lower support base assemblies; a rotating shaft assembly; and one or more upper pressing assemblies; wherein, the first beam has a first mounting recess at the end of the first beam for receiving the gap crossing plate, the second beam has a second mounting recess at the end of the second beam for receiving the fixed plate; the one or more height adjustment assemblies, the one or more lower support base assemblies, the rotating shaft assembly and the one or more upper pressing assemblies are disposed in the first mounting recess; each height adjustment assembly is disposed inside the first mounting recess, each lower support base assembly is connected to one corresponding height adjustment assembly, the rotating shaft assembly extending along a width of the bridge is supported on the one or more lower support base assemblies, each upper pressing assembly is connected to the one corresponding height adjustment assembly and located above the aforementioned lower support base assembly and presses the rotating shaft assembly. Thus, the gap crossing plate and the fixed plate can be installed without any bolt.
Preferably, each lower support base assembly has a plurality of lower positioning holes each extending vertically, and each upper pressing assembly has a plurality of upper positioning through holes each extending vertically and corresponding to one of the plurality of lower positioning holes; a detachable adjustment fastener passes downward through each upper positioning through hole and each corresponding lower positioning hole, so as to adjust a mounting position of each lower support base assembly, each upper pressing assembly and the gap crossing plate.
The lower support base assembly and the upper support base assembly each can be designed in various structures. Preferably, each lower support base assembly comprises a rib plate and a lower support base disposed on and supported by the rib plate, each upper pressing assembly comprises a L-shaped buckling plate having a top transverse portion and a side vertical portion, the rotating shaft assembly comprises a rotating shaft connected to the bottom of the gap crossing plate and located on the lower support base; the top transverse portion of the buckling plate is buckled on the lower support base and presses the rotating shaft tightly together with the lower support base, and the side vertical portion of the buckling plate is connected to the corresponding height adjustment assembly; the plurality of lower positioning holes is located on the lower support base, and the plurality of upper positioning holes is located on the top transverse portion of the buckling plate.
Preferably, the buckling plate comprises a first snap plate, a second snap plate and a top press plate located between the first snap plate and the second snap plate for pressing the rotating shaft, the rotating shaft assembly further comprises an elastic press plate disposed between the top press plate and the rotating shaft. The elastic press plate is usually an elastic rubber plate. When the top press plate presses the rotating shaft, the rotating shaft is pressed by the deformation of the rubber plate, so that the gap crossing plate can rotate, through the rotating shaft, relative to the lower support base assembly and the upper pressing assembly.
Preferably, the buckling plate is a one-piece member, the rotating shaft assembly further comprises an elastic press plate disposed between the top transverse portion of the buckling plate and the rotating shaft. Similarly, with an arrangement of the elastic press plate, it is convenient for the gap crossing plate to rotate, through the rotating shaft, relative to the lower support base assembly and the upper pressing assembly.
The height adjustment assembly can be designed in various structures. Each height adjustment assembly is a height adjustment plate which is located at the side of the support rib, the lower support base and the buckling plate; each height adjustment plate has a step portion adjacent to the buckling plate to support the buckling plate; the support rib and the lower support base are connected to the height adjustment plate and the side vertical portion of the buckling plate by a connecting piece. In this way, the height of the buckling plate can be adjusted directly through the height adjustment plate, and the height of the lower support base assembly can be adjusted indirectly by connecting members, so that the gap crossing plate can be adjusted to reach a desired flatness.
To fix the height adjustment assembly on a bottom of the first mounting recess, a first embedded steel sheet is mounted on the bottom of the first mounting recess, and a bottom of each height adjustment assembly is connected to the first embedded steel sheet by welding.
The height adjustment assembly can be designed in other structures. Preferably, each height adjustment assembly is an L-shaped connecting plate, and the lower support base assembly and the upper pressing assembly are connected to the L-shaped connecting plate by welding.
To realize transverse rotation and vertical turning of the expansion and contraction device, a plurality of elastic fastening assemblies is connected to a bottom of the gap crossing plate, the one or more lower support base assemblies are located at a root of the gap crossing plate and the plurality of elastic fastening assemblies is located away from the root of the gap crossing plate; a bottom of each elastic fastening assembly is connected to a bottom of the first mounting recess or connected to the corresponding lower support base assembly.
Preferably, each elastic fastening assembly comprises a box having a bottom, a bolt having a top and an elastic sleeve; the bottom of the box is connected to the bottom of the first mounting recess, the bolt is disposed inside the box with the top of the bolt extending upward from the box to connect to the bottom of the gap crossing plate, and the elastic sleeve surrounding the bolt is disposed inside the box. Under such a design, the elastic fastening assembly is capable of turning transversely or vertically in some extents. The elastic sleeve may be made of various elastic materials such as spring, rubber, spring diaphragm and spring wire.
Preferably, each elastic fastening assembly comprises an clastic main body, an upper connecting reinforcing bar, a lower connecting reinforcing bar and a threaded end; the threaded end is disposed at a top of the elastic fastening assembly to connect to the bottom of the gap crossing plate, the first mounting recess is filled with concrete, the upper connecting reinforcing bar is positioned and embedded in the concrete, and the lower connecting reinforcing bar is connected to the lower support base assembly.
A bumper baffle is connected to an outer side of the height adjustment assembly so that a concrete-free structure can be ensured. The bumper baffle may be a steel plate, and may be adjusted in height according to the actual mounting size requirement.
Preferably, both the gap crossing plate and the fixed plate have matching comb teeth which engage with each other.
The fixed plate can be disposed in various ways. Preferably, the second mounting recess has a bottom, a second embedded steel sheet is disposed on the bottom of the second mounting recess, and the fixed plate is connected to the second embedded steel sheet through a plurality of support racks.
The support rack can be designed in various structures. Preferably, each support rack comprises two support plates in a saddle shape and an upper support plate atop the support plates, the support plates are disposed at regular intervals along a width of the bridge, a stainless steel sliding plate is disposed on the upper support plate, and the fixed plate rests on the stainless steel sliding plate.
Preferably, each support plate is arranged along the width of the bridge, correspondingly, each upper support plate is arranged along a length of the bridge.
To make the mounting structure of the support rack firmer, preferably, each upper support plate has a plurality of reinforcing bar via holes.
Preferably, the plurality of support plates is disposed in two lines arranged along the length of the bridge, each upper support plate is supported between two corresponding support plates of different lines.
To limit the fixed plate in the direction of the length of the bridge, preferably, a limit plate which limits the fixed plate in the direction of the length of the bridge is disposed adjacent to an outer side of an outer line of the support plates.
Preferably, each support plate is arranged along a length of the bridge, correspondingly, each upper support plate is arranged along the width of the bridge.
To make the mounting structure of the support rack firmer, preferably, each upper support plate has a plurality of reinforcing bar via holes.
As another solution for the fixation of the fixed plate, the second mounting recess has a bottom, a plurality of shear studs is disposed on the bottom of the second mounting recess, and the fixed plate is fastened on the shear studs through a plurality of anchor assemblies.
For achieving the second object, the installation method of the bridge expansion and contraction device comprises:
To realize a concrete-free structure, preferably, after the step S4 and before the step S5, a bumper baffle is connected to the outer side of the height adjustment assembly by welding, and a top surface of the bumper baffle is flush with a bridge floor.
Preferably, before the step S5, the slags and welds are completely cleaned to ensure that the mounting recesses are clean.
Preferably, in the step S4, adjustment bolts are used as the adjustment fasteners, and the upper positioning holes and the lower positioning holes are bolt holes; firstly, the lower support base assemblies, the upper pressing assemblies and the gap crossing plate are adjusted to a proper position and then fastened by the adjustment bolts; then, each lower support base assembly and the corresponding upper pressing assembly are fastened to the corresponding height adjustment assembly by welding; and finally, the adjustment bolts are removed, and the bolt holes are plug-welded or sealed by elastic glue.
Preferably, in the step S4, using a top surface of the gap crossing plate as a baseline, a top of the upper pressing assembly is leveled with the top surface of the gap crossing plate by tooling, and each lower support base assembly is connected to the corresponding upper pressing assembly by welding; and then, each upper pressing assembly is fastened to the corresponding height adjustment assembly by welding.
Compared with the prior art, the bridge expansion and contraction device of the present invention has following advantages: the bridge expansion and contraction device can be mounted without bolts at a bridge construction site, thus the loosening connection between bolts and nuts is eliminated, and a noise produced by running of vehicles is reduced since there is no bolt hole on the surface of the beams; the gap crossing plate is mounted through an elastic connection among the lower support base assembly, the rotating shaft assembly and the upper pressing assembly, accordingly, the gap crossing plate is prevented from falling-off and a function of a transverse turning and a vertical turning of the gap crossing plate can be achieved. In a process of mounting at a bridge construction site, the flatness between the expansion and contraction device and the bridge floor can be adjusted according to the depth of the recess through the adjustment of the height of the height adjustment assembly, the bridge expansion and contraction device is welded to the embedded steel sheet in the recess directly, reducing intermediate steps, so that the bridge expansion and contraction device can be mounted quickly.
The present invention will be further described below in detail by embodiments with reference to the accompanying drawings.
One or more height adjustment assemblies 5, one or more lower support base assemblies 6, the rotating shaft assembly 7 and one or more upper pressing assemblies 8 are disposed in the first mounting recess 31. Each height adjustment assembly 5 is connected to the end 3 of the first beam inside the first mounting recess 31. Specifically, the first mounting recess 31 has a bottom, a first embedded steel sheet 11 is mounted on the bottom of the first mounting recess 31, a bottom of each height adjustment assembly 5 is connected to the first embedded steel sheet 11 by welding. Each height adjustment assembly 5 in this embodiment is a height adjustment plate 51 having a step portion 511.
Considering a direction indicated by the arrow A in
The rotating shaft assembly 7 in this embodiment comprises a rotating shaft 71 and an clastic press plate 72. The rotating shaft 71 extends along a width of the bridge and is connected to the bottom of the gap crossing plate 1. The clastic press plate 72, an clastic rubber plate, is compressed between the top press plate 82 and the rotating shaft 71. The rotating shaft 71 is compressed by a deformation of the rubber plate 72, so that the gap crossing plate 1 is fastened and is capable of rotating, through the rotating shaft 71, relative to the lower support base assembly 6 and the upper pressing assembly 8. That is, the bridge expansion and contraction device is capable of turning vertically through the rotating shaft 71. When the mounting is completed, the top transverse portion of the buckling plate 81 is buckled on the lower support base 62 and presses the rotating shaft 71 tightly together with the lower support base 62; the support rib 61 and the lower support base 62 are connected to the height adjustment plate 51 and the side vertical portion of the buckling plate 81 through welding to a connecting piece 9. The buckling plate 81 can be connected to the height adjustment plate 51 by welding.
In addition, the buckling plate 81 can be a one-piece member. The elastic press plate 72 is compressed between the rotating shaft and the buckling plate 81.
As shown in
As shown in
In this embodiment, each support rack 14 comprises two support plates 141 in a saddle shape and an upper support plate 142 atop the support plates 141. A bottom of each support plate 141 is welded onto the second embedded steel sheet 12. The support plates 141 are disposed at regular intervals along the width of the bridge and disposed in two lines arranged along the length of the bridge, each upper support plate 142 is supported between two corresponding support plates 141 of different lines. In this embodiment, each support plate 141 is arranged along the width of the bridge, each upper support plate 142 is arranged along a length of the bridge. The support plate 141 has a chute 1411 in a middle of the support plate 141 for receiving the upper support plate 142. The flatness between the fixed plate 2 and the bridge floor is adjusted by the chute 1411. A stainless steel sliding plate 143 is disposed on the upper support plate 142 and the fixed plate 2 rests on the stainless steel sliding plate 143.
The bridge expansion and contraction device in this embodiment is a concrete-free structure, and a bumper baffle 13 is connected to an outer side of the height adjustment plate 51. The bumper baffle 13 may be a steel plate, and may be adjusted in height according to an actual mounting size requirement. As shown in
In addition, considering the height adjustment assembly 5, the corresponding lower support base assembly 6 and upper pressing assembly 8 as a group of support assemblies. As shown in
When the bridge has a horizontally transverse movement, the bridge expansion and contraction device is capable of rotating transversely due to an elastic deformation produced by the clastic fastening assemblies 10 in a front and the elastic press plate 72 and also due to a gap between the comb teeth of the gap crossing plate 1 and the fixed plate 2. When the bridge has a vertical movement, the bridge expansion and contraction device is capable of rotating vertically due to a rotation of the rotating shaft assembly 7 compressed by the upper pressing component 8.
The installation process of the bridge expansion and contraction device in this embodiment comprises: digging of recesses for receiving the expansion and contraction device, cleaning of the recesses, detection of embedded steel sheets in the recesses, mounting of the elastic support assemblies, mounting of a part of the bridge expansion and contraction device which is disposed inside the recesses, mounting of the rest components of the bridge expansion and contraction device, pouring of the elastic assemblies, and completing the mounting of the whole bridge expansion and contraction device.
Specifically, the installation method comprises:
In the step S2, a bottom of each support plate 141 is welded onto the second embedded steel sheet 12, and the top of the support plate 141 is connected to the fixed plate 2 by welding. The flatness between the fixed plate 2 and the bridge floor is adjusted by the chute 1411 on the top of the support plate 141.
In this embodiment, between the step S4 and the step S5, another two steps may be added in the step S4 and the step S5: (a) connecting a bumper baffle 13 to the outer side of the height adjustment assembly 5 by welding so that a top surface of the bumper baffle 13 is flush with a bridge floor; and (b) cleaning slags and welds completely to ensure that the mounting recesses are clean.
In addition, in the step S4, adjustment bolts are used as the adjustment fasteners, and the upper positioning holes and the lower positioning holes are bolt holes. Firstly, the lower support base assemblies 6, the upper pressing assemblies 8 and the gap crossing plate 1 are adjusted to a proper position and then fastened by the adjustment bolts; then, each lower support base assembly 6 and the corresponding upper pressing assembly 8 are fastened to the corresponding height adjustment assembly 5 by welding; and finally, the adjustment bolts are removed, and the bolt holes are plug-welded or sealed by elastic glue. Alternatively, using a top surface of the gap crossing plate 1 as a baseline, a top of the upper pressing assembly 8 is leveled with the top surface of the gap crossing plate 1 by tooling, and each lower support base assembly 6 is connected to the corresponding upper pressing assembly 8 by welding; and then, each upper pressing assembly 8 is fastened to the corresponding height adjustment assembly 5 by welding. In conclusion, in addition to transverse displacement, a function of a transverse turning and a vertical turning of the gap crossing plate can be achieved. By using the multidirectional-displacement bridge expansion and contraction device which can be fastened by buckling instead of bolts, the bridge expansion and contraction device can be mounted without bolts at a bridge construction site, thus the loosening connection between bolts and nuts is eliminated, and a noise produced by the running of vehicles is reduced since there is no bolt hole on the plate surface of the beams. Accordingly, the gap crossing plate is prevented from falling-off.
As shown in
As shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211108764.3 | Sep 2022 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2023/099132 | 6/8/2023 | WO |
