JP2009155936A - Expansion device for bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion device for a bridge, which dispenses with execution of a step of welding an anchor to a plate body, to thereby achieve simplified and inexpensive production thereof. <P>SOLUTION: According to the structure of the expansion device, a pair of plate main bodies 20, 20 are opposed to each other in a manner forming an expansion gap 11 therebetween. Each of the plate main bodies 20, 20 are divided into a plurality of plate members 21, and anchor members 22, 23 which each extend in a direction opposite to the expansion gap 11, are attached to both edges of each plate member 21. Herein the plate member 21 and the anchor members 22, 23 are formed in one piece of a common material (e.g. a steel plate) by bending the material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an expansion device for a bridge provided on a highway road bridge or the like and provided to absorb expansion and contraction of a bridge girder.

Conventionally, as a bridge expansion and contraction device, a seal member made of rubber is provided between a pair of plate-like main bodies extending meandering along the bridge joint between the bridge girder and the bridge girder or between the bridge girder and the abutment. There are known anchors (rebars) fixed to the back of the main body. The anchor is provided to fix the plate-shaped main body to the concrete, and is directly welded to the back surface of the plate-shaped main body (Patent Document 1) or screwed to a nut welded to the back surface (Patent Document 2).
JP 2004-332358 A JP-A-6-41907

  The process of welding the anchor or nut to the back surface of the plate-like main body is complicated, and the plate-like member may be distorted or holed by welding. The welding process increases the cost of the telescopic device.

  An object of the present invention is to simplify and reduce the cost of manufacturing a bridge extension device by eliminating the step of welding an anchor to a plate-like main body.

  The expansion device for a bridge according to the present invention includes a pair of plate-like main bodies that extend in a direction intersecting with the bridge axis of the bridge and are opposed to form a gap, and each plate member is divided into a plurality of plate members. An anchor member extending on the opposite side to the gap is provided at both ends of the plate, and the plate member and the anchor member are integrally formed of a common material.

  The plate member and the anchor member are preferably formed by bending a single steel plate. When the anchor member is formed by bending as described above, a separate member such as a reinforcing bar is not required, and a welding process is not required. Therefore, the expansion device can be easily manufactured and the manufacturing cost is reduced.

  Adjacent anchor members are preferably connected by, for example, bolts / nuts or welding. As a result, the expansion and contraction device is assembled as a single unit, and transport to the site is facilitated.

  A hole or a recess may be formed in the anchor member. For example, the hole or the recess may be provided to pass through a reinforcing bar extending in a direction intersecting the bridge axis of the bridge, and may have a size such that a plurality of reinforcing bars can be inserted. The reinforcing bar is fixed to the inner peripheral edge of the hole or recess by welding or the like.

  The anchor member extending from one of the pair of plate-like main bodies and the anchor member extending from the other may be provided at corresponding positions or may be provided at different positions.

  The upper end portion of the anchor member may be formed so as to be inclined so as to become lower as the distance from the plate member increases. According to this structure, it becomes a guide member with respect to the snow removal grader and snow plow of a snowplow in a cold region, and the possibility that the expansion / contraction device is damaged by the snow removal grader or the like is reduced.

  By bending the upper end of the anchor member inward, the rigidity of the anchor member can be increased, the plate thickness of the plate member and the anchor member can be reduced, and the entire telescopic device can be reduced in weight. As reinforcement in the vicinity of the anchor member, a reinforcing plate may be provided between adjacent anchor members, or a reinforcing plate may be provided on the inner surface of the anchor member.

  According to the present invention, it is possible to easily and cost-effectively manufacture the bridge expansion and contraction device by eliminating the need to perform the step of welding the anchor to the plate-like main body.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a bridge telescopic device of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment. 1 is a perspective view of the telescopic device, FIG. 2 is an exploded perspective view of a plate member that is a component of the telescopic device, and FIG. 3 is a perspective view of the plate member shown in FIG. 4 is a plan view of the telescopic device, and FIG. 5 is a front view showing a state in which the telescopic device is installed.

  The telescopic device 10 has a pair of plate-like main bodies 20, 20 provided in a joint portion of the bridge (between the bridge girder or between the bridge girder and the abutment) to absorb the expansion and contraction of the bridge girder and extending in the width direction of the bridge. . The pair of plate-like main bodies 20, 20 face each other so as to form an interval of a predetermined size, that is, a gap 11, and the gap 11 is formed to have a meandering shape. In the clearance 11, a seal member 12 formed of rubber is provided. The seal member 12 has the same meandering shape as that of the clearance 11 and is adhered to the inner wall surfaces of the plate-like main bodies 20 and 20 while maintaining watertightness. Further, the seal member 12 has a substantially V-shaped or U-shaped cross-sectional shape, can stop rain water, and can follow behavior such as expansion and contraction of the bridge girder.

  The plate-like main body 20 is divided into a plurality of plate members 21, and is divided into six in this embodiment. As shown in FIGS. 2 and 3, first and second anchor members 22 and 23 extending on the opposite side to the gap 11 (FIG. 1) are provided at both ends of each plate member 21. The plate member 21 and the first and second anchor members 22 and 23 are formed by bending a single steel plate.

  The plate member 21 includes a main body portion 21a extending at an inclination of about 45 degrees with respect to the width direction of the bridge, and connection portions 21b provided at both ends of the main body portion 21a and extending in parallel with the width direction of the bridge. The first and second anchor members 22 and 23 are perpendicular to the connecting portion 21b. The first anchor member 22 is relatively long and the second anchor member 23 is relatively short. When the plate member 21 is joined and the telescopic device 10 is assembled, the anchor member 22, The distal ends of 23 are aligned over the entire telescopic device 10.

  Adjacent anchor members, that is, first anchor members 22 extending from adjacent plate members 21 are connected by bolts and nuts 24. Similarly, the second anchor members 23 are also connected. As a result, the six plate members 21 are connected to form one plate-like main body 20. As shown in FIG. 4, a trapezoidal bottom plate 13 is provided below the two adjacent plate members 21, 21, and the bottom plate 13 is bonded to the lower end portion of the plate member 21 by welding or the like.

  Each anchor member 22, 23 is provided with two holes 25 for inserting the reinforcing bars 14 extending in the width direction of the bridge. The holes 25 are formed at the same position in all the anchor members 22 and 23, and as shown in FIG. 5, the upper rebar 14 contacts the upper end of the hole 25, and the lower rebar 14 contacts the lower end of the hole 5. Touching. The upper edges 26 of the anchor members 22 and 23 are formed horizontally as a whole, but the portion close to the plate member 21 is formed higher than the other portions and is at the same height as the plate member 21.

  A pair of plate-like main bodies 20 formed by connecting six plate members 21 at anchor members 22 and 23 are arranged so that a meandering gap 11 is formed between them, and these plate-like main bodies 20, The seal member 12 is bonded to the inner wall surface of the 20. A bottom plate 13 is attached to the lower end of the plate-like main body 20. When the telescopic device 10 assembled in this way is viewed from above, as shown in FIG. 4, the anchor member extending from the right plate-like body 20 and the anchor member extending from the left plate-like body 20 correspond to each other. Provided at the position. That is, in the bent portion A of the meandering plate-like main body 20, the anchor member extends in both the left and right directions.

  The telescopic device 10 is prepared in a number corresponding to the width of the bridge and connected to each other, and is installed on the floor slab 16 sandwiching the joint play 15. In construction, a U-shaped reinforcing bar is embedded in the floor slab in advance, and the upper end of the U-shaped reinforcing bar protrudes from the floor slab. There, the expansion device is installed so that the upper surface thereof is substantially flush with the road surface, and the reinforcing bar 14 is passed through the hole 25. Next, the inverted U-shaped reinforcing bar is welded to the upper end of the U-shaped reinforcing bar so as to be positioned outside the reinforcing bar 14, and the reinforcing reinforcing bar 17 having a rectangular frame shape is formed. The reinforcing bar 14 is welded to the reinforcing reinforcing bar 17 and the anchor members 22 and 23. Thereby, the expansion-contraction apparatus 10 is connected and fixed to the floor slab via the reinforcing bars (FIG. 5). In this state, the concrete is placed on the back side of the plate-like main body 20, that is, on the anchor members 22 and 23 side so as to be substantially flush with the road surface.

  As described above, in the present embodiment, the plate-like main body 20 of the telescopic device 10 is provided with the anchor members 22 and 23 on the back side of the plate member 21 by bending one steel plate, and connects adjacent anchor members. Configured. That is, the anchor members 22 and 23 are integrally formed by a steel plate bending process at a manufacturing factory of the expansion and contraction device 10, and it is not necessary to provide another member such as a reinforcing bar on the back surface of the plate-like main body 20. Thus, by integrally forming the plate member 21 and the anchor members 22 and 23 with a common material, the expansion device 10 can be easily manufactured and the manufacturing cost can be reduced. Moreover, since it is not necessary to weld a reinforcing bar to the plate-shaped main body 20, a hole and distortion do not occur by welding.

Furthermore, since the anchor members 22 and 23 have substantially the same width as the plate member 21 and are perpendicular to the surface of the plate member 21, the same effect as that obtained when a large number of ribs are formed on the plate member 21 occurs. Compared with the case where a reinforcing bar is welded to the plate member 21, the rigidity of the expansion and contraction device 10 is improved. Therefore,
In a state in which the expansion / contraction device 10 is supported only by the reinforcing reinforcing bars 17 during construction (see FIG. 5), the plate-like main body side does not bend downward, and the upper surface of the plate-like main body maintains the same plane state with respect to the road surface. To do. Further, even after the construction, the expansion / contraction device 10 is less likely to be deformed by a load acting in the vertical direction, and the load bearing capacity of the vehicle or the like traveling on the bridge is increased.

  Further, as described above, the number of expansion / contraction devices 10 corresponding to the width of the bridge is prepared, and the anchor members 22 and 23 of the expansion / contraction devices 10 adjacent in the width direction are connected by bolts / nuts or the like. Therefore, it is not necessary to separately provide a connecting member for connecting the expansion / contraction devices 10 to each other, and the anchor members 22 and 23 can also serve as the connecting member.

FIG. 6 is a front view showing a state in which the telescopic device according to the second embodiment is constructed.
In this embodiment, the upper edges 27 and 28 of the anchor members 22 and 23 are inclined so as to become lower as the distance from the plate member 21 increases. The height of the distal end of the relatively long first anchor member 22 is substantially the same as the height of the distal end of the relatively short second anchor member 23, and the first and second ends in the vicinity of the plate member 21. The inclination angles of the upper edges 27 and 28 of the anchor members 22 and 23 are the same. That is, the inclination angle of the upper edge 28 on the distal end side of the second anchor member 23 is larger than the inclination angle of the upper edge 27 on the distal end side of the first anchor member 22. Other configurations are the same as those of the first embodiment.

  For example, in a cold region, snow removal work may be performed by a snow removal grader or the like, but the blade of the snow removal grader is guided by the anchor members 22 and 23 and can pass through the joint portion without damaging the plate member 21. Therefore, it is not necessary to provide a special guide member for a snow removal grader or the like.

  7 and 8 show a third embodiment. In this embodiment, the upper ends 22a and 23a of the anchor members 22 and 23 are bent inward (the side where the pair of anchor members 22 and 23 face each other). That is, the upper end 22a of the first anchor member 22 is bent horizontally in the direction of the second anchor member 23, and the upper end 23a of the second anchor member 23 is bent horizontally in the direction of the first anchor member 22. The height positions of the upper ends 22a and 23a are the same. Thereby, the rigidity of the anchor members 22 and 23 is improved.

  By bending the upper ends 22a and 23a, the rigidity of the anchor members 22 and 23 is increased. Accordingly, the plate thickness of the plate member 21 and the anchor members 22 and 23 can be reduced, and the extension device 10 can be reduced in weight. Moreover, the rigidity of the anchor members 22 and 23 can be easily adjusted to a desired value by selecting the widths of the upper ends 22a and 23a to be bent.

  9 and 10 show a fourth embodiment. In this embodiment, a reinforcing plate 31 is provided between adjacent anchor members 22 and 22. The reinforcing plate 31 has the same shape as the anchor member 22 between which the reinforcing plate 31 is sandwiched, and is provided with a hole 32 through which the reinforcing bar 14 (FIG. 5) is inserted. With this configuration, the same effect as in the third embodiment can be obtained.

  FIG. 11 shows a fifth embodiment. In this embodiment, the reinforcing plate 33 is provided in close contact with the inner surface side of the anchor member 22 (the wall surface facing the paired anchor member 23), and the two reinforcing plates 33 and 33 are adjacent to each other. The anchor members 22 and 22 are sandwiched. The reinforcing plate 33 has the same shape as the anchor member 22 and is provided with a hole 34 for inserting the reinforcing bar 14 (FIG. 5). With this configuration, the same effect as in the third and fourth embodiments can be obtained.

  FIG. 12 shows a sixth embodiment. In the first embodiment, the meandering shape of the plate-like main body 20 and the gap 11 is square, but in the sixth embodiment, it is curved in a sinusoidal shape. Therefore, the joint portion of the bottom plate 35 with the plate-like main body 20 also exhibits a smooth curve according to the shape of the plate-like main body 20. Other configurations are the same as those of the first embodiment, and the operational effects are also the same.

  FIG. 13 shows a seventh embodiment. The difference from the first embodiment is that the first anchor member 41 extending from one of the pair of plate-like main bodies and the first anchor member 41 extending from the other are provided at different positions. The first plate member 42 includes a parallel portion 42a that extends in parallel along the joint portion of the bridge, an inclined portion 42b that is connected to both ends of the parallel portion 42a, and that extends obliquely with respect to the joint portion, and an inclined portion 42b. And a connecting portion 42c parallel to the joint portion. As in the first embodiment, the first anchor member 41 extends from the connection portion 42c to the back side. Therefore, the first plate member 42 and the pair of first anchor members 41 and 41 have an M shape.

  The telescopic device 10 is formed to a certain length. Therefore, in order to form the plate-like main body so that the play has a meandering shape, it is necessary to arrange the second plate member 43 having a half length of the first plate member 42 at both ends of the expansion / contraction device 10. It is. The second plate member 43 has a parallel portion 43a, an inclined portion 43b, and a connection portion 43c. The first anchor member 41 extends from the connection portion 43c, and the second portion is relatively short from the parallel portion 43a. An anchor member 44 extends. In this embodiment, when the telescopic device 10 is viewed from above, three first plate members 42 are arranged on the left side of FIG. 13 and two first plate members 42 are arranged on the right side. The 2nd board member 43 is provided in the both sides.

  FIG. 14 shows an eighth embodiment. In this embodiment, the point that the first anchor member 41 extending from one of the pair of plate-like main bodies and the first anchor member 41 extending from the other are provided at different positions is the same as in the seventh embodiment. The arrangement of the plate members 42 and 43 is different. That is, when the telescopic device 10 is viewed from above, three first plate members 42 are arranged on the left side of FIG. 14, and a second plate member 43 is provided at the upper end. On the other hand, three first plate members 42 are arranged on the right side, and a second plate member 43 is provided at the lower end.

  The seventh and eighth embodiments have the same configuration as that of the first embodiment except for the configuration described above, and exhibit the same operational effects as those of the first embodiment.

  In each of the above embodiments, the plate member is formed by bending or curving and the gap is formed in a meandering shape. However, the present invention is not limited to this, and the plate-like main body, that is, the gap is linear. The present invention can also be applied to the case where it extends to.

  Further, each of the above embodiments has been described on the assumption that the joint portion of the bridge extends in the width direction of the bridge, that is, the direction perpendicular to the bridge axis, but the present invention is not limited to this, and the joint portion of the bridge is It can also be applied to the case where it is inclined with respect to the direction perpendicular to the bridge axis.

  Furthermore, in each said embodiment, although the shape of the hole 25 formed in the anchor members 22 and 23 was circular, it may be oval as shown in FIG. Further, in place of the hole 25, a rectangular recess 51 (FIG. 16) formed by cutting out the lower edge portions of the anchor members 22 and 23 may be adopted, and the lower end portion of the oval hole 25 and the anchor member 22 may be adopted. , 23 may be provided with a notch 52 (FIG. 17) connecting the lower edge portions, or a slit 53 (FIG. 18) extending horizontally to reach the tips of the anchor members 22, 23.

It is a perspective view of the expansion-contraction apparatus which is the 1st Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the plate member which is a component of an expansion-contraction apparatus. It is a perspective view which joins and shows a plate member. It is a top view of an expansion-contraction apparatus. It is a front view which shows the state which installed the expansion-contraction apparatus in the floor slab. It is a front view which shows the state which constructed the expansion-contraction apparatus of 2nd Embodiment. It is a perspective view which decomposes | disassembles and shows the board member of 3rd Embodiment. It is a perspective view which shows the state which assembled the plate member of 3rd Embodiment. It is a perspective view which decomposes | disassembles and shows the board member of 4th Embodiment. It is a perspective view which shows the state which assembled the board member of 4th Embodiment. It is the perspective view which shows the state which decomposed | disassembled the plate member of 5th Embodiment, and the assembled state. It is a top view which shows the expansion-contraction apparatus of 6th Embodiment. It is a top view which shows the expansion-contraction apparatus of 7th Embodiment. It is a top view which shows the expansion-contraction apparatus of 8th Embodiment. It is a front view which shows the 1st modification of an anchor member. It is a front view which shows the 2nd modification of an anchor member. It is a front view which shows the 3rd modification of an anchor member. It is a front view which shows the 4th modification of an anchor member.

Explanation of symbols

11 idle 20 plate-shaped main body 21, 42, 43 plate member 22, 23, 42, 43 anchor member

Claims (11)

  A telescopic device for a bridge provided at a joint portion of a bridge, wherein a pair of plate-like main bodies extending in a direction intersecting a bridge axis of the bridge and facing each other so as to form a gap are each divided into a plurality of plate members. In addition, an anchor member extending on the opposite side of the gap is provided at both ends of each plate member, and the plate member and the anchor member are integrally formed of a common material. .   The expansion / contraction device for a bridge according to claim 1, wherein the plate member and the anchor member are formed by bending a single steel plate.   Adjacent anchor members are connected to each other, and the bridge telescopic device according to claim 1.   The bridge telescopic device according to claim 1, wherein a hole or a recess is formed in the anchor member.   The expansion and contraction device for a bridge according to claim 1, wherein the pair of plate-like main bodies are formed so that the gap has a meandering shape.   The expansion / contraction device for a bridge according to claim 1, wherein an anchor member extending from one of the pair of plate-like main bodies and an anchor member extending from the other of the pair of plate-like main bodies are provided at corresponding positions.   The expansion / contraction device for a bridge according to claim 1, wherein an anchor member extending from one of the pair of plate-like main bodies and an anchor member extending from the other of the pair of plate-like main bodies are provided at different positions.   The expansion / contraction device for a bridge according to claim 1, wherein the upper end portion of the anchor member is inclined so as to become lower as the distance from the plate member increases.   The bridge telescopic device according to claim 1, wherein an upper end of the anchor member is bent inward.   The expansion / contraction apparatus for bridges according to claim 1, wherein a reinforcing plate is provided between adjacent anchor members.   The expansion / contraction device for a bridge according to claim 1, wherein a reinforcing plate is provided on an inner surface of the anchor member.

Images