JP6068243B2 - Expansion joint for road - Google Patents

Description

  The present invention relates to a road expansion joint installed at a joint portion of a road bridge or the like. The term “joint part of a road bridge or the like” as used herein is a concept including a joint part between a road and a bridge, a joint part between bridges, and a joint part between elevated roads in a viaduct.

  Road bridges are provided with a gap (gap) to absorb the expansion and contraction of the road bridge floor slab due to the outside temperature and to allow deformation due to the weight of the vehicle. The expansion joint is installed.

  There are many forms of such expansion joints, but in Patent Document 1, a pair of corrugated plates are spaced apart in the bridge length direction so as to form a corrugated play extending in the longitudinal direction of the joint portion of the road bridge. There is described an expansion joint in which post-cast concrete is placed on the back of each corrugated sheet.

  Further, Patent Document 2 includes a vertical plate facing each other and a horizontal plate in one comb-like shape welded on each vertical plate, and the comb teeth are combined so that each other's comb teeth are in mesh with each other. An expansion joint is described in which post-cast concrete is cast on the back of a vertical plate.

  When installing these expansion joints, the reinforcing connecting bars raised from the floor slab with the expansion joints suspended to a predetermined height using a jig such as a hanging rod, and the above corrugated plate After connecting the horizontal anchor projected from the (vertical plate) to the back side by welding, post-cast concrete is placed.

  However, since the expansion joint has a structure integrated with post-cast concrete, when performing replacement work due to a decrease in strength or water stoppage, the post-cast concrete is crushed and removed to the vicinity of the floor slab. At the same time, after cutting the connecting portion between the horizontal anchor and the reinforcing connecting bar and removing the existing expansion joint, the reinforcing connecting bar is raised again from the floor slab. From the reinforcing connecting bar and the corrugated plate (vertical plate) After welding the protruding horizontal anchor, it is necessary to again place post-cast concrete, and there is a problem that much time, labor and cost are required. In addition, similar work is required when repairing floor slabs and water-stopping structures at joints such as road bridges. In this case, the expansion joint itself can be integrated with post-cast concrete even if there is no abnormality. Therefore, the expansion joint could not be reused.

JP 2001-123406 A JP 2004-100150 A

  The problem to be solved by the present invention is to provide a road expansion joint that has the strength and water-stopping properties required for an expansion joint, can be replaced more easily than before, and can be reused. There is to do.

  The expansion joint for road according to the present invention is a road expansion joint installed at a joint portion of a road bridge or the like, and extends in the longitudinal direction of the joint portion, and is opposed across a gap allowing expansion and contraction of the joint portion. A pair of boxes, and a pair of butting portions projecting in a state where a certain gap portion is held from the front wall facing the pair of boxes toward the front wall side of the opposing box. A plurality of first openings are provided on the back wall of the box so as to be aligned in the longitudinal direction of the seam, and a second opening is provided on the top wall of the box, and the first opening is provided in the box. A fixing means for fixing the inserted anchor member is disposed in the box, and the fixing means can be fixed to and released from the anchor member from the second opening. That.

  As described above, in the expansion joint of the present invention, the anchor member can be fixed and released from the second opening provided on the upper wall of the box by the fixing means. The expansion joint can be removed if the anchor member is fixed by the fixing means without cutting the connecting portion between the anchor member and the reinforcing connecting bar, and the remaining anchor member is also installed when the expansion joint is installed. The reinforcing connecting bars can be used as they are. Therefore, the replacement work of the expansion joint is easy and can be reused. Moreover, since the expansion joint of the present invention has a box structure, it is not necessary to place post-cast concrete, and asphalt can be paved to the back wall of the box. And it has sufficient intensity | strength with respect to the load and impact which generate | occur | produce repeatedly in an expansion joint by vehicle passage, and can also exhibit the water stop required as an expansion joint without a problem.

  In the present invention, it is possible to provide a notch portion connected to the lower wall of the box from the first opening portion, and to allow the anchor member inserted into the box from the first opening portion to pass through the notch portion. As a result, after the anchor member is fixed by the fixing means, the expansion joint can be pulled out as it is, and the load of the replacement work is further reduced.

  Moreover, in this invention, a notch step part can be provided in the upper back side of the said box, and the said 2nd opening part can be provided in the bottom face wall of this notch step part. Thereby, the pavement structure around the expansion joint can be made into a two-layer structure of concrete up to the position of the bottom wall of the notch step portion and asphalt above it. Then, the pavement around the expansion joint wears out in the same way as the surrounding pavement, so it is difficult for steps to occur in the pavement area around the expansion joint, and it is possible to prevent impact, vibration, and noise when passing through the vehicle. it can. In addition, if the pavement is removed to the position of the bottom wall of the notch step, the expansion joint can be removed, and the range for removing the pavement around the expansion joint can be narrowed, reducing the work load (time, labor, cost). . Furthermore, since the second opening is covered with asphalt and is not exposed to the road surface, damage to the second opening, earth and sand from the second opening, and intrusion of dust can be prevented.

  Further, in the present invention, the fixing means includes a nut attached to a male screw portion formed in an anchor member inserted into the box from the first opening, and attached to the anchor member, And a positioning member that fits into a recessed portion provided on the inner surface. Thereby, it is possible to reliably prevent the expansion joint from moving in the vertical direction against a load or an impact repeatedly generated in the expansion joint due to the passage of the vehicle.

  ADVANTAGE OF THE INVENTION According to this invention, the replacement | exchange operation | work of the expansion joint installed in the joint parts, such as a road bridge, can be performed more easily than before. In addition, the expansion joint once removed can be reused. Therefore, it is possible to improve the maintainability of the joint portion such as a road bridge, and it is possible to reduce the maintenance cost.

It is a schematic longitudinal cross-sectional view which shows the state which installed the expansion joint by one Example of this invention in the joint parts, such as a road bridge. FIG. 2 is a partially broken perspective view of the expansion joint of FIG. 1 viewed from above with an anchor member. It is the partial fracture | rupture perspective view which looked at the expansion joint of FIG. 1 from the downward direction with the anchor member. FIG. 2 is a partially cutaway perspective view showing the fixing means portion of the expansion joint of FIG. 1 in an exploded manner. It is a perspective view which shows the internal structure of the box which attaches the fixing means shown in FIG.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is a schematic longitudinal sectional view showing a state in which an expansion joint according to an embodiment is installed at a joint portion of a road bridge, etc., FIG. 2 is a partially broken perspective view of the expansion joint of FIG. FIG. 3 is a partially broken perspective view of this as seen from below. 4 is a partially broken perspective view showing the fixing means portion of the expansion joint of FIG. 1 in an exploded manner, and FIG. 5 is a perspective view showing the internal structure of the box to which the fixing means is attached. 2 and 3, the end portion of the expansion joint indicates a surface obtained by vertically cutting the middle of the expansion device in the longitudinal direction.

  An expansion joint 20 is installed at a joint portion of a road bridge or the like (hereinafter simply referred to as a “seam portion”) with a floor slab space 11 between the floor slabs 10 of the road bridge interposed therebetween.

  The expansion joint 20 has a pair of boxes 21 that extend in the longitudinal direction of the joint portion and are arranged to face each other with the floor slab space 11 interposed therebetween in order to allow expansion and contraction of the joint portion. The pair of boxes 21 are provided with a pair of butting portions 22 projecting from the upper portions of the opposing front walls toward the front wall side of the opposing boxes 21 while holding a certain gap portion. Specifically, each abutting portion 22 has convex portions 22a and concave portions 22b that are alternately formed along the longitudinal direction of a joint portion such as a road bridge, and the opposing convex portions 22a and concave portions 22b mesh with each other. A pair of butting portions 22 is configured.

  Each box 21 is made of ductile cast iron and has a notch step portion 23 on the upper back side thereof. Each box 21 is hollow, and a plurality of first openings 24 (see FIG. 5) are provided on the back wall so as to be aligned in the longitudinal direction of the joint. Further, the bottom wall 23 a of the notch step portion 23 is provided with a second opening portion 25 corresponding to the position of the first opening portion 24.

  As clearly shown in FIG. 4, one end of the anchor member 40 is inserted into the box 21 from the first opening 24, and a nut 26 as a fixing means is attached to the male screw portion formed at one end of the anchor member 40. It is mounted via a washer 26a. The anchor member 40 is fixed to the box 21 by the nut 26. In this embodiment, the positioning member 27 is used in addition to the nut 26 in order to securely fix the anchor member 40. The positioning member 27 has a ring shape and is fitted into one end of the anchor member 40. The positioning member 27 is fitted into a recessed portion 28 provided on the inner surface of the back wall of the box 21 when the anchor member 40 is fixed. The recessed portion 28 is provided with a tool insertion hole 28a. The anchor member 40 can be fixed by the fixing means (the nut 26 and the positioning member 27) by inserting a tool or the like through the second opening 25. Note that the nut 26 and the positioning member 27 as fixing means may be configured as separate members as in this embodiment, or may be configured as a single member in which these are integrated.

  Further, as shown in FIGS. 2 and 3, in this embodiment, the nut 29 is attached to the anchor member 40 via the washer 29a on the outer surface side of the back wall of the box 21, and the anchor member 40 is further tightened. It is fixed securely.

  Referring to FIGS. 3 and 5, the box 21 is provided with a notch 30 connected to the lower wall of the box 21 from the first opening 24 provided on the back wall thereof. This notch 30 is provided to allow the anchor member 40 to pass when the existing expansion joint 20 is pulled upward during replacement work of the expansion joint 20 described later.

  In addition, referring to FIG. 2, a columnar projecting portion 31 projecting to the back side is provided at the notch step portion 23 portion of the box 21 at a position aligned with each convex portion 22 a of the butting portion 22. The overhanging portion 31 has a function of a reinforcing rib that improves the strength of the box 21. Moreover, when installing the expansion joint 20 in a snowy area, an inclined surface can be provided on the upper surface of the overhang portion 31 to provide a function of avoiding the blade of the snowplow. Furthermore, a protrusion for preventing slipping can be formed on the upper surfaces of the protruding portion 31 and the convex portion 22a.

  Next, a procedure for newly installing the expansion joint 20 will be described.

  First, as shown in FIG. 1, a plate-like foam material 50 is bent and inserted in an inverted U shape into the floor slab space 11, and the foam material 50 is fixed by the repulsive force, and the sealing material 51 is caulked from above. And stop the water. When the floor slab space 11 is narrow, a plate-like foam material is inserted as it is, and a sealing material is caulked from above.

  Next, on the sealing material 51, a plate-like foamed urethane 52 serving as an inner mold for preventing the non-shrinking mortar to be poured later from entering the floor slab 11 is disposed along the longitudinal direction of the joint portion. The expansion joint 20 is installed on it. Specifically, the expansion joint 20 is installed so that the upper part of the urethane foam 52 fits between the pair of boxes 21 of the expansion joint 20. The shelf 21a is provided in the lower part of the front wall which each box 21 opposes, and the expansion joint 20 is installed so that the urethane foam 52 may be pressed by the shelf 21a. In addition, in the space above the shelf 21a, a urethane backup material 53 is mounted in advance for dust prevention, and an elastic sealing material 54 is poured from above. Further, when installing the expansion joint 20, it is convenient that the expansion joint 20 is suspended at a predetermined height using a jig such as a hanging rod as in the conventional case.

  When the expansion joint 20 is installed at a predetermined position, the anchor member 40 fixed in advance to each box 21 of the expansion joint 20 by the fixing means (the nut 26 and the positioning member 27), and the reinforcing connection raised from the floor slab 10 The muscle 41 is connected by welding. In addition, the auxiliary connecting bars 42 are connected to the anchor members 40 and the reinforcing connecting bars 41 for reinforcement. Note that a plurality of expansion joints 20 are installed side by side in the longitudinal direction of the joint portion. At this time, each expansion joint 20 is connected by an appropriate connection means.

  Thereafter, the non-shrink mortar 55 is poured to the height level of the bottom wall 23 a of the notch step portion 23 of the box 21. At this time, the first opening 24 and the notch 30 provided in the box 21 are closed with gum tape or the like, and the second opening 25 is closed with a cap or the like so that the non-shrink mortar 55 does not enter the box 21. . When the non-shrink mortar 55 is solidified, the asphalt 56 is applied thereon.

  Since the expansion joint 20 installed in this way has a box structure with a pair of boxes 21, the expansion joint 20 has sufficient strength against loads and impacts repeatedly generated in the expansion joint 20 during vehicle traffic, and is necessary as an expansion joint. Can also exhibit water-stopping without problems. In the present embodiment, the expansion joint 20 and the anchor member 40 are fixed using the positioning member 27 in addition to the nut 26 as described with reference to FIG. Since the positioning member 27 is fitted in the recessed portion 28 on the inner surface of the box 21, it is possible to reliably prevent the expansion joint 20 from moving up and down against a load and an impact repeatedly generated on the expansion joint 20 due to the passage of the vehicle. Further, the anchor member 40 can be prevented from falling off.

  Next, a procedure for replacing the expansion joint 20 will be described.

  First, in FIG. 1, the asphalt 56 around the expansion joint 20 is removed to a position where the bottom wall 23a of the notch step portion 23 of the box 21 is exposed. Then, a tool or the like is inserted from the second opening 25 provided in the bottom wall 23a of the notch step 23, and the nut 26 and the positioning member 27, which are fixing means for fixing the anchor member 40, are removed from the anchor member 40, and the anchor The fixing of the member 40 to the box 21 is released. The positioning member 27 can be removed from the recessed portion 28 by inserting a tool into the tool insertion hole 28a shown in FIG.

  When the nut 26 and the positioning member 27 are removed from all the anchor members 40, the expansion joint 20 is pulled out upward. At this time, since the pair of boxes 21 of the expansion joint 20 are provided with the notches 30 as shown in FIG. 3 and the like, the anchor member 40 passes through the notches 30 without interfering with the boxes 21. Thereby, the existing expansion joint 20 can be removed.

  After the expansion joint 20 is removed, when installing a new or reuse expansion joint 20, one end of the existing anchor member 40 is passed through the notch 30 of the box 21 and positioned in the box 21. Then, one end of the anchor member 40 is fixed to the box 21 by the fixing means (nut 26 and positioning member 27) described above. The anchor member 40 can be fixed by the fixing means by inserting a tool or the like through the second opening 25. Thereafter, the installation of the expansion joint 20 is completed according to the above-described procedure of the new installation.

  As described above, according to the expansion joint 20 of the present invention, the expansion device 20 and the anchor member 40 can be fixed and released from the second opening 25 provided in the box 21. The expansion joint 20 can be removed if the anchor member 40 is released by the fixing means (the nut 26 and the positioning member 27) without cutting the connecting portion between the anchor member protruding from the joint and the reinforcing connecting bar. become able to. Therefore, the replacement work of the expansion joint 20 is easy and can be reused. Further, if the notch 30 through which the anchor member 40 can pass is provided as in the present embodiment, the expansion joint 20 is left as it is after the anchor member 40 is fixed by the fixing means (the nut 26 and the positioning member 27). It becomes possible to pull out upward, and also when the expansion joint 20 is reinstalled, the notch 30 functions effectively as described above. Thereby, the load of replacement work is further reduced.

  However, the notch 30 is not essential in the present invention, and the first opening 24 may be provided. Even if the notch 30 is not provided, the anchor member 40 can be attached and detached through the first opening 24 if the box 21 of the telescopic device 20 is shifted obliquely.

  In the embodiment, the box 21 is provided with the notch step 23, but this is not essential. In the case where the notch step 23 is not provided, the second opening is provided on the upper surface wall of the box 21. However, by providing the notch step portion 23, the pavement structure around the expansion joint 20 is made up to the position of the bottom wall 23 a of the notch step portion 23, as in this embodiment (concrete mortar 55), and above it. Can be a two-layer structure of asphalt 56. Then, since the pavement around the expansion joint 20 is worn in the same manner as the pavement around the expansion joint 20, it becomes difficult for a step to occur in the pavement portion around the expansion joint 20 and to prevent impact, vibration, and noise when passing through the vehicle. Can do.

DESCRIPTION OF SYMBOLS 10 Floor slab 11 Floor slab free space 20 Expansion joint 21 Box 22 Butting part 22a Convex part 22b Concave part 23 Notch step part 23a Bottom wall of notch step part 24 1st opening part 25 2nd opening part 26 Nut (fixing means)
26a Washer 27 Positioning member (fixing means)
28 Depressed part 29 Nut 29a Washer 30 Notch part 31 Overhang part 40 Anchor member 41 Reinforcing connecting bar 42 Auxiliary connecting bar 50 Foam material 51 Sealing material 52 Foamed urethane 53 Backup material 54 Elastic sealing material

Claims (4)

Expansion joints for roads installed at joints such as road bridges,
A pair of boxes that extend in the longitudinal direction of the seam portion and are arranged opposite to each other with a gap between the seam portions to allow expansion and contraction;
A pair of butting portions projecting in a state of holding a certain gap from the opposing front wall of the pair of boxes toward the front wall side of the opposing box,
A plurality of first openings are provided on the back wall of the box so as to be aligned in the longitudinal direction of the seam, and a second opening is provided on the top wall of the box,
A fixing means for fixing the anchor member inserted into the box from the first opening is arranged in the box so that the fixing means can be fixed to the anchor member and released from the second opening. Expansion joint for road.   2. The road use according to claim 1, wherein a notch portion connected to the lower wall of the box from the first opening portion is provided, and an anchor member inserted into the box from the first opening portion can pass through the notch portion. Expansion joints.   The expansion joint for roads according to claim 1 or 2, wherein a notch step portion is provided on an upper back side of the box, and the second opening is provided on a bottom wall of the notch step portion.   The fixing means includes a nut attached to a male screw portion formed on an anchor member inserted into the box from the first opening, and a recess provided on the inner surface of the back wall of the box. The expansion joint for roads in any one of Claims 1 thru | or 3 which has a positioning member fitted in a part.

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