Bridge Expansion and Contraction Device and Installation Method Therefor

Abstract

A bridge expansion and contraction device comprises a gap crossing plate disposed in a first mounting recess and a fixed plate dispose in a second mounting recess. One or more height adjustment assemblies, lower support base assemblies, a rotating shaft assembly and upper pressing assemblies are disposed in the first mounting recess. Each lower support base assembly is connected to one corresponding height adjustment assembly, the rotating shaft assembly is supported on the 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. In a process of mounting, the flatness between the expansion and contraction device and the bridge floor is adjusted, and the device can be mounted quickly without bolts. The present invention further discloses an installation method of the bridge expansion and contraction device.

Claims

1. A bridge expansion and contraction device, which is disposed between an end (3) of a first beam and an end (4) of a second beam, comprising: a gap crossing plate (1) connected to the first beam and crossing over a gap between the first beam and the second beam; a fixed plate (2) being engaged with the gap crossing plate (1) and connected to the second beam; one or more height adjustment assemblies (5); one or more lower support base assemblies (6); a rotating shaft assembly (7); and one or more upper pressing assemblies (8); wherein, the first beam has a first mounting recess (31) at the end (3) of the first beam for receiving the gap crossing plate (1), the second beam has a second mounting recess (41) at the end (4) of the second beam for receiving the fixed plate (2); the one or more height adjustment assemblies (5), the one or more lower support base assemblies (6), the rotating shaft assembly (7) and the one or more upper pressing assemblies (8) are disposed in the first mounting recess (31); each height adjustment assembly (5) is disposed inside the first mounting recess (31), each lower support base assembly (6) is connected to one corresponding height adjustment assembly (5), the rotating shaft assembly (7) extending along a width of the bridge is supported on the one or more lower support base assemblies (6), each upper pressing assembly (8) is connected to the one corresponding height adjustment assembly (5) and located above the aforementioned lower support base assembly (6) and presses the rotating shaft assembly (7).

2. The bridge expansion and contraction device of claim 1, wherein each lower support base assembly (6) has a plurality of lower positioning holes (60) each extending vertically, and each upper pressing assembly (8) has a plurality of upper positioning through holes (80) each extending vertically and corresponding to one of the plurality of lower positioning holes (60); a detachable adjustment fastener passes downward through each upper positioning through hole (80) and each corresponding lower positioning hole (60), so as to adjust a mounting position of each lower support base assembly (6), each upper pressing assembly (8) and the gap crossing plate (1).

3. The bridge expansion and contraction device of claim 2, wherein each lower support base assembly (6) comprises a rib plate (61) and a lower support base (62) disposed on and supported by the rib plate (61), each upper pressing assembly (8) comprises a L-shaped buckling plate (81) having a top transverse portion and a side vertical portion, the rotating shaft assembly (7) comprises a rotating shaft (71) connected to the bottom of the gap crossing plate (1) and located on the lower support base (62); 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), and the side vertical portion of the buckling plate (81) is connected to the corresponding height adjustment assembly (5); the plurality of lower positioning holes (60) is located on the lower support base (62), and the plurality of upper positioning holes (80) is located on the top transverse portion of the buckling plate (81).

4. The bridge expansion and contraction device of claim 3, wherein the buckling plate (81) comprises a first snap plate (811), a second snap plate (812) and a top press plate (82) located between the first snap plate (811) and the second snap plate (812) for pressing the rotating shaft (71), the rotating shaft assembly (7) further comprises an elastic press plate (72) disposed between the top press plate (82) and the rotating shaft (71).

5. The bridge expansion and contraction device of claim 3, wherein the buckling plate (81) is a one-piece member, the rotating shaft assembly (7) further comprises an elastic press plate (72) disposed between the top transverse portion of the buckling plate (81) and the rotating shaft (71).

6. The bridge expansion and contraction device of claim 3, wherein each height adjustment assembly (5) is a height adjustment plate (51) which is located at the side of the support rib (61), the lower support base (62) and the buckling plate (81); each height adjustment plate (51) has a step portion (511) adjacent to the buckling plate (81) to support the buckling plate (81); 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) by a connecting piece (9).

7. The bridge expansion and contraction device of claim 2, wherein 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.

8. The bridge expansion and contraction device of claim 1, wherein each height adjustment assembly (5) is an L-shaped connecting plate (52), the lower support base assembly (6) and the upper pressing assembly (8) are connected to the L-shaped connecting plate (52) by welding.

9. The bridge expansion and contraction device of claim 1, wherein a plurality of elastic fastening assemblies (10) is connected to a bottom of the gap crossing plate (1), the one or more lower support base assemblies (6) are located at a root of the gap crossing plate (1) and the plurality of elastic fastening assemblies (10) is located away from the root of the gap crossing plate (1); a bottom of each elastic fastening assembly (10) is connected to a bottom of the first mounting recess (31) or connected to the corresponding lower support base assembly (6).

10. The bridge expansion and contraction device of claim 9, wherein each elastic fastening assembly (10) comprises a box (101) having a bottom, a bolt (102) having a top and an elastic sleeve (103); the bottom of the box (101) is connected to the bottom of the first mounting recess (31), the bolt (102) is disposed inside the box (101) with the top of the bolt (102) extending upward from the box (101) to connect to the bottom of the gap crossing plate (1), and the elastic sleeve (103) surrounding the bolt (102) is disposed inside the box (101).

11. The bridge expansion and contraction device of claim 9, wherein each elastic fastening assembly (10) comprises an elastic main body (104), an upper connecting reinforcing bar (105), a lower connecting reinforcing bar (106) and a threaded end (107); the threaded end (107) is disposed at a top of the elastic fastening assembly (10) to connect to the bottom of the gap crossing plate (1), the first mounting recess (31) is filled with concrete (17), the upper connecting reinforcing bar (105) is positioned and embedded in the concrete (17), and the lower connecting reinforcing bar (106) is connected to the lower support base assembly (6).

12. The bridge expansion and contraction device of claim 1, wherein a bumper baffle (13) is connected to an outer side of the height adjustment assembly (5).

13. The bridge expansion and contraction device of claim 1, wherein both the gap crossing plate (1) and the fixed plate (2) have matching comb teeth which engage with each other.

14. The bridge expansion and contraction device of claim 1, wherein the second mounting recess (41) has a bottom, a second embedded steel sheet (12) is disposed on the bottom of the second mounting recess (41), and the fixed plate (2) is connected to the second embedded steel sheet (12) through a plurality of support racks (14).

15. The bridge expansion and contraction device of claim 14, wherein each support rack (14) comprises two support plates (141) in a saddle shape and an upper support plate (142) atop the support plates (141), the support plates (141) are disposed at regular intervals along a width of the bridge, 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).

16. The bridge expansion and contraction device of claim 15, wherein each support plate (141) is arranged along the width of the bridge, correspondingly, each upper support plate (142) is arranged along a length of the bridge.

17. The bridge expansion and contraction device of claim 16, wherein each upper support plate (142) has a plurality of reinforcing bar via holes (1421).

18. The bridge expansion and contraction device of claim 16, wherein the plurality of support plates (141) is 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.

19. The bridge expansion and contraction device of claim 18, wherein a limit plate (144) which limits the fixed plate (2) in the direction of the length of the bridge is disposed adjacent to an outer side of an outer line of the support plates (141).

20. The bridge expansion and contraction device of claim 15, wherein each support plate (141) is arranged along a length of the bridge, correspondingly, each upper support plate (142) is arranged along the width of the bridge.

21. The bridge expansion and contraction device of claim 20, wherein each upper support plate (142) has a plurality of reinforcing bar via holes (1421).

22. The bridge expansion and contraction device of claim 1, wherein the second mounting recess (41) has a bottom, a plurality of shear studs (15) is disposed on the bottom of the second mounting recess (41), and the fixed plate (2) is fastened on the shear studs (15) through a plurality of anchor assemblies (16).

23. An installation method of the bridge expansion and contraction device of claim 7, comprising: S1) integrally digging and cleaning the mounting recesses for receiving the bridge expansion and contraction device, and measuring a depth of each mounting recess; S2) according to the depth of the mounting recesses measured in the step S1, correspondingly processing one or more height adjustment assemblies (5) of the bridge expansion and contraction device, welding the height adjustment assemblies (5) onto the first embedded steel sheet (11), and cleaning slags and welds; S3) mounting the fixed plate (2), and adjusting flatness between the fixed plate (2) and the bridge floor; S4) mounting the gap crossing plate (1), adjusting flatness between the gap crossing plate (1) and the fixed plate (2) to meet the requirement of a desired flatness, mounting the lower support base assemblies (6), the rotating shaft assembly (7) and the upper pressing assemblies (8), adjusting the position of each lower support base assembly (6) and the corresponding upper pressing assembly (8) to be connected to the corresponding height adjustment assembly (5); and S5) pouring concrete in the first mounting recess (31) and the second mounting recess (41) and curing to complete the mounting of the bridge expansion and contraction device.

24. The installation method of claim 23, wherein after the step S4 and before the step S5, a bumper baffle (13) is connected to the outer side of the height adjustment assembly (5) by welding, and a top surface of the bumper baffle (13) is flush with a bridge floor.

25. The installation method of claim 23, wherein before the step S5, the slags and welds are completely cleaned to ensure that the mounting recesses are clean.

26. The installation method of claim 23, wherein 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.

27. The installation method of claim 23, wherein in the step S4, 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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG. 1 is a plan view of a bridge expansion and contraction device according to Embodiment 1 of the present invention;

[0039] FIG. 2 is a plan view of a support plate in a saddle shape according to Embodiment 1 of the present invention;

[0040] FIG. 3 is a sectional view of the bridge expansion and contraction device according to Embodiment 1 of the present invention;

[0041] FIG. 4 is another plan view of the bridge expansion and contraction device with three groups of support assemblies on one gap crossing plate according to Embodiment 1 of the present invention during mounting;

[0042] FIG. 5 is another sectional view of the bridge expansion and contraction device according to Embodiment 1 of the present invention;

[0043] FIG. 6 is a sectional view of an elastic fastening assembly according to Embodiment 1 of the present invention;

[0044] FIG. 7 is a sectional view of a part of the bridge expansion and contraction device according to Embodiment 1 of the present invention;

[0045] FIG. 8 is a top plan view of the FIG. 7;

[0046] FIG. 9 is a plan view of a bridge expansion and contraction device according to Embodiment 2 of the present invention;

[0047] FIG. 10 is a sectional view of the bridge expansion and contraction device according to Embodiment 2 of the present invention;

[0048] FIG. 11 is a plan view of an elastic fastening assembly according to Embodiment 2 of the present invention;

[0049] FIG. 12 is a sectional view of a part of the bridge expansion and contraction device according to Embodiment 2 of the present invention;

[0050] FIG. 13 is a sectional view of a rotating shaft assembly according to Embodiment 2 of the present invention;

[0051] FIG. 14 is a perspective view of a bridge expansion and contraction device according to Embodiment 3 of the present invention;

[0052] FIG. 15 is a perspective view of a bridge expansion and contraction device according to Embodiment 4 of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0053] The present invention will be further described below in detail by embodiments with reference to the accompanying drawings.

Embodiment 1

[0054] FIGS. 1-8 show a preferred Embodiment 1 of a bridge expansion and contraction device of the present invention. The bridge expansion and contraction device comprises a gap crossing plate 1 and a fixed plate 2 being engaged with the gap crossing plate 1. Both the gap crossing plate 1 and the fixed plate 2 have matching comb teeth which engage with each other and respectively arranged at intervals at an opposite end of the gap crossing plate 1 and the fixed plate 2. The first beam has a first mounting recess 31 at the end 3 of the first beam for receiving the gap crossing plate 1, the second beam has a second mounting recess 41 at the end 4 of the second beam for receiving the fixed plate 2.

[0055] 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.

[0056] Considering a direction indicated by the arrow A in FIG. 3 as an inward direction (a direction of inner side), the lower support base assembly 6 is arranged on an inner side of the height adjustment plate 51. Each lower support base assembly 6 in this embodiment comprises a rib plate 61 and a lower support base 62 disposed on and supported by the rib plate 61. The rib plate 61 is a triangular rib plate, and each lower support base assembly 6 has a plurality of lower positioning holes 60 each extending vertically. Each upper pressing assembly 8 comprises a L-shaped buckling plate 81 having a top transverse portion and a side vertical portion. The step portion 511 support the buckling plate 81 so that a height of the buckling plate 81 can be adjusted by the height adjustment plate 51. As shown in FIG. 8, the buckling plate 81 in this embodiment is a split member. That is, the buckling plate 81 comprises a first snap plate 811, a second snap plate 812 and a top press plate 82 located between the first snap plate 811 and the second snap plate 812. Both the first snap plate 811 and the second snap plate 812 are steel sheets. The top press plate 82 made of clastic material compresses a rotating shaft 71 on the gap crossing plate 1. Meanwhile, due to its elasticity, the gap crossing plate 1 is capable of rotating under certain stress, to meet the vertical turning requirement of the bridge. The first snap plate 811, the second snap plate 812 and the top press plate 82 may be made into one piece. The first snap plate 811, the second snap plate 812 have a plurality of lower positioning holes 60 each extending vertically on a top of the first snap plate 811, the second snap plate 812. A detachable adjustment fastener passes downward through each upper positioning through hole 80 and each corresponding lower positioning hole 60, so as to adjust a mounting position of each lower support base assembly 6, each upper pressing assembly 8 and the gap crossing plate 1. In this embodiment, adjustment bolts (which are not shown in Figs) are used as the adjustment fasteners, and the upper positioning holes and the lower positioning holes are bolt holes. 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.

[0057] 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.

[0058] 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.

[0059] As shown in FIG. 3, FIG. 5 and FIG. 6, a plurality of elastic fastening assemblies 10 is connected to a bottom of the gap crossing plate 1, the one or more lower support base assemblies 6 are located at a root of the gap crossing plate 1 and the plurality of elastic fastening assemblies 10 is located away from the root of the gap crossing plate 1; a bottom of each elastic fastening assembly 10 is connected to a first embedded steel sheet 11 mounted on the bottom of the first mounting recess 31. Each elastic fastening assembly 10 comprises a box 101 having a bottom, a bolt 102 having a top and an elastic sleeve 103. The bottom of the box 101 is connected to the bottom of the first mounting recess 31, the bolt 102 is disposed inside the box 101 with the top of the bolt 102 extending upward from the box 101 to connect to the bottom of the gap crossing plate 1, and the elastic sleeve 103 surrounding the bolt 102 is disposed inside the box 101. The box 101, made of steel sheets, protects the elastic sleeve 103. Each elastic fastening assembly 10 is capable of turning transversely and vertically in some extents. The elastic sleeve may be made of various clastic materials such as spring, rubber, spring diaphragm and spring wire.

[0060] As shown in FIGS. 2-3, the second mounting recess 41 has a bottom, a second embedded steel sheet 12 is disposed on the bottom of the second mounting recess 41, and the fixed plate 2 is connected to the second embedded steel sheet 12 through a plurality of support racks 14.

[0061] 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.

[0062] 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 FIG. 3, a bridge floor pavement layer 18 is arranged on the outer side of the bumper baffle 13. Top surfaces of the gap crossing plate 1, the fixed plate 2 and the bumper baffle 13 are flush with a top surface of the bridge floor pavement layer 18. The bridge floor pavement layer 18 may be made of various pavement materials, for example, pitch, concrete, epoxy resin, etc.

[0063] 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 FIG. 1, four groups of support assemblies are arranged at an outer end, i.e., the root, of the gap crossing plate 1. As shown in FIG. 4, three groups of support assemblies are arranged at the outer end, i.e., the root, of the gap crossing plate 1. The number of groups of support assemblies can be determined according to different width of the gap crossing plate 1.

[0064] 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.

[0065] 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.

[0066] Specifically, the installation method comprises: [0067] S1) integrally digging and cleaning the mounting recesses for receiving the bridge expansion and contraction device, and measuring a depth of each mounting recess; [0068] S2) according to the depth of the mounting recesses measured in the step S1, correspondingly processing one or more height adjustment assemblies 5 of the bridge expansion and contraction device, welding the height adjustment assemblies 5 onto the first embedded steel sheet 11, and cleaning slags and welds; [0069] S3) mounting the fixed plate 2, and adjusting flatness between the fixed plate 2 and the bridge floor; [0070] S4) mounting the gap crossing plate 1, adjusting flatness between the gap crossing plate 1 and the fixed plate 2 to meet the requirement of a desired flatness, mounting the lower support base assemblies 6, the rotating shaft assembly 7 and the upper pressing assemblies 8, adjusting the position of each lower support base assembly 6 and the corresponding upper pressing assembly 8 to be connected to the corresponding height adjustment assembly 5 by welding; and [0071] S5) pouring concrete in the first mounting recess 31 and the second mounting recess 41 and curing to complete the mounting of the bridge expansion and contraction device.

[0072] 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.

[0073] 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.

[0074] 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.

Embodiment 2

[0075] FIGS. 9-13 show a preferred Embodiment 2 of the bridge expansion and contraction device of the present invention. The bridge expansion and contraction device in this embodiment is a concrete structure. Each height adjustment plate 5 in this embodiment is an L-shaped connecting plate 52, the lower support base assembly 6 and the upper pressing assembly 8 are connected to the L-shaped connecting plate 52 by welding. Each elastic fastening assembly 10 comprises an elastic main body 104, an upper connecting reinforcing bar 105, a lower connecting reinforcing bar 106 and a threaded end 107. The threaded end 107 is disposed at a top of the clastic fastening assembly 10 to connect to the bottom of the gap crossing plate 1, the first mounting recess 31 is filled with concrete 17, the upper connecting reinforcing bar 105 is positioned and embedded in the concrete 17, and the lower connecting reinforcing bar 106 is connected to the lower support base assembly 6. In this embodiment, the second mounting recess 41 has a bottom, a plurality of shear studs 15 is disposed on the bottom of the second mounting recess 41, and the fixed plate 2 is fastened on the shear studs 15 through a plurality of anchor assemblies 16. The remaining structure of this embodiment is the same as that of the Embodiment 1, and will not be further described here.

Embodiment 3

[0076] As shown in FIG. 14, in the bridge expansion and contraction device in this embodiment, each upper support plate 142 has a plurality of reinforcing bar via holes 1421. During mounting, the reinforcing bars pass through the reinforcing bar via holes 1421 so as to enhance a structural strength of the bridge expansion and contraction device. In this embodiment, a limit plate 144 which limits the fixed plate 2 in the direction of the length of the bridge is disposed adjacent to an outer side of an outer line of the support plates 141. The limit plate 144 has a plurality of reinforcing bar via holes. The remaining structure of this embodiment is the same as that of the Embodiment 1, and will not be further described here.

Embodiment 4

[0077] As shown in FIG. 15, in the bridge expansion and contraction device in this embodiment, each support plate 141 is arranged along a length of the bridge, correspondingly, each upper support plate 142 is arranged along the width of the bridge. The plurality of support plates 141 is disposed in two lines arranged along the length of the bridge, and the upper support plate 142 connects the support plates 141 arranged in a same column. To improve the structural strength of the bridge expansion and contraction device, each support plate 141 has a plurality of reinforcing bar via holes 1421. The elastic fastening assembly 10 in this embodiment may have the same structure as that in Embodiment 1, or the same structure as that in Embodiment 2, or other structures. The remaining structure of this embodiment is the same as that of Embodiment 1, and will not be further described here.