JPS6017882B2 - road joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint constructed at a road joint of a bridge or elevated road.

Conventionally, steel finger joints and rubber joints have been constructed at road joints, but the joint members are exposed to the road surface, and the materials used to fix the joint members are different from that of the concrete and asphalt pavement. Because there are boundaries between roads, the wear of the road surface due to rutting becomes uneven at the boundaries, and gaps and grooves are provided to absorb the expansion and contraction of the road, so tires slump when vehicles pass. In addition to impeding the running performance of the vehicle, there are problems in that not only vibrations and noise occur at road joints, but also road pollution due to low frequencies occurs, and durability is also adversely affected.

In addition, there are also so-called blind joints, where pavement is continuously applied over the floor slabs and gaps between the slabs, but the pavement tends to cave in between the gaps, and furthermore, the expansion and contraction of the road can cause cracks in the pavement in a short period of time. The problem was that it eventually broke.

The present invention aims to solve this problem, and forms a notch stepped portion with a bottom surface lower than the top surface of the deck slab at the end of the floor slab facing each other with a gap, and the bottom surface of both notched stepped portions is A load-receiving plate spanning the gap is erected, and the top surface of the deck slab and the joint pavement are continuously paved between the top surface of the deck slab and the side surfaces of both notched steps so that the top surfaces are flush with each other. The thickness of the pavement on the load-bearing slope in the pavement is at least twice the thickness of the pavement on the top surface of the deck slab, so that the tensile and compressive stresses that occur as the road expands and contracts are dispersed and absorbed by the thick joint pavement.
The joint pavement and the floor slab are connected by a connecting member to prevent the pavement from peeling off.

In particular, in the present invention, by lowering the bottom surface of the notch step, even if the upper end of the connecting member is kept low, a sufficient connection between the joint pavement and the deck slab can be obtained, and the upper end of the connecting member is lowered. By making it possible to increase the thickness of the pavement, cracks are prevented from forming at the joint member locations. below,
The configuration of the present invention will be explained based on the drawings based on examples.

Example 1 This example is shown in FIG. 1, where 1 is a road joint,
A cutout step 4 is provided at the end of the floor slabs 3, 3 facing each other with a play space 2 between them.
, 4 are formed, and the upper surface 5 of the floor slab, the cutout step 4 and the clearance 2
A slab top surface pavement 6, a notched step pavement 7, and an upper gap pavement 8 are continuously applied on each of the above, and the notched step pavement 7 and the upper gap pavement 8 constitute a joint pavement. ing.

The cutout step portion 4 consists of a substantially horizontal bottom surface 9 that is lower than the top surface 5 of the deck slab, and a side surface 11 that is retreated from the deck end surface 10 in the bridge length direction, and a U-shaped striation 12 provided as a shield on the deck slab 3 extends from the bottom surface 9. Moreover, the distribution reinforcement 113 is provided protruding from the side surface 11, and the U-shaped reinforcement 12 and the distribution reinforcement 113 are connected to the through reinforcement 14 extending in the direction of the road, thereby increasing the bonding force between the deck slab 3 and the notched step pavement 7. is enhanced.

In other words, the upper part of the U-shaped bar 12 is buried in the joint pavement, and the lower part is buried in the floor slab 2, thereby connecting the joint pavement and the floor slab. In addition, there is a clearance 2 on the bottom surfaces 9, 9 of the notch steps 4, 4.
A load-receiving plate 15 is layered or fixed in a bridge-like manner across the gap, and the load-receiving plate prevents the gap upper pavement 8 from sinking into the gap 2. In addition, the load receiving plate 15 in the joint pavement
The thickness of the pavement above is more than twice that of the upper surface pavement 6 of the deck slab. Note that the load receiving plate 15 can be prevented from falling into the play area 2 by providing a protrusion 16 on its lower surface or by providing an appropriate locking means between the floor slab 3 and the load receiving plate 15. . The slab upper surface pavement 6, the notch step pavement 7, and the gap upper pavement 8 are made by continuously pouring a paving material containing bituminous material such as asphalt or tar, and the upper surface of each pavement is formed flush. Cut grooves 17 are formed in the boundary between the slab upper surface pavement 6 and the notch step pavement 7 and in the gap upper pavement 8 in the direction toward the middle of the road.

In the figure, the boundaries of each pavement are indicated by chain lines. A suitable number of kerfs 17 are provided as necessary when cracks are likely to occur, and a filler such as tar or liquid seal rubber may be injected into the kerfs. In this example, pavement 6,
), 8 are continuous, so the wear of the road surface due to rutting is uniform, vehicle running performance is good, vibration, noise and low frequency are not generated, and the pavement 7 of the successive step section and the upper pavement 8 of the gap are Because of the layer thickness, the degree of reinforcement at road joints is high. Incidentally, the gap upper pavement 8 is subjected to tension and compression due to the expansion and contraction of the road, but this expansion and contraction is absorbed by the grooves 17.
Furthermore, the stress generated by the above-mentioned tension and compression is dispersed in the thick cut-out step pavement 7 and the gap upper pavement 8, and as the paving material, a transparent bituminous material with high elongation is used. Since the road is constantly compressed and leveled from above by the wheel load of passing vehicles, the bulges of the notched step pavement 7 and the gap upper pavement 8 are prevented from cracking. Furthermore, even if the inside of the kerf 17 becomes wide due to the contraction of the road in winter, maintenance is easy because it can be filled with liquid seal rubber, tar, etc. Also, U-shaped muscle 1
2, if its upper end protrudes significantly upwards than the upper surface 5 of the floor slab, cracks are likely to occur due to the upper end being fake.
In the case of this embodiment, since the upper end of the U-shaped striations 12 is kept lower than the upper surface 5 of the floor slab, the U-shaped striations 12 do not cause cracks. Note that instead of the load receiving plate 15, a substrate 18 made of a rubber plate or a steel plate is used as shown in FIG.
Using a load receiving plate 20 with a thin recycled rubber non-vulcanized adhesive plastic material 19 fixed to both the upper and lower surfaces or only to the lower surface, the adhesive plastic material 19 is used to form the pavements 7 and 8 and the notch steps 4.
In some cases, the adhesive force with the bottom surface 9 may be increased.

Embodiment 2 This embodiment is shown in FIG. 3 and relates to a joint 25 in which the side portion 11 of the cutout step portion 4 is inclined.

In other words, the notch step 4 is wide in the middle on the upper side, and since more paving material is poured into the notch step, the degree of reinforcement of the pavement joint is increased, and the side surface 11 is Because the road is slanted, expansion and contraction of the road will cause the upper part of the gap to be paved.
In addition, since the tensile force and compressive force applied to the notch step pavement 7 are alleviated, the durability of the road joint is improved. Although the above embodiment is applied to a road bridge having a structure in which deck slabs 3 are cast on steel girders, the present invention can also be applied to prestressed concrete girder bridges and reinforced concrete girder bridges.
It may also apply.

In this case, the successive step portion is formed at the end of the concrete reinforcement. Additionally, lattice plates may be buried horizontally in the pavement at the joints above the gaps, and the lattice plates can disperse the fertile load to both sides of the gaps and suppress the occurrence of cracks in the pavement. In some cases, reticulated expansion metal is used. As described above, according to the present invention, since the pavement is continuously applied at road joints, vehicle running performance is improved, vibration, noise, and low frequency generation are prevented, and the load receiving plate is This prevents the pavement from sinking into the gaps, and since the joint pavement is thick, it prevents cracks from occurring, and the top end of the joining member can be kept low, which prevents cracks from forming due to the installation of the joining member. The joint pavement and the deck slab can be joined together to prevent the pavement from peeling off.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a cross-sectional view in the bridge length direction showing a joint of Example 1, FIG. 2 is a cross-sectional view showing another example of the load receiving plate in the same example, and FIG. is a diagram similar to FIG. 1 in Example 2. 1, 25...Joint, 2...Playroom, 3...Floor slab, 4...
Notch step portion, 5... Upper surface of the deck slab, 6... Upper surface pavement of the deck slab,
7... Notched step Tokyo council bag, 8... Paving above the play area, 9...
・Bottom surface, 11...Side surface, 12...U-shaped stripe, 13...
- Distribution bar, 14... Suitable bar, 15, 20... Load receiving bar, 17... Cut groove, 18... Substrate, 19... Adhesive plastic body. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. At the ends of the floor slabs facing each other across the gap at the road joint, a notch step is formed with a substantially horizontal bottom surface that is lower than the top surface of the deck slab and a side surface that is set back from the end surface of the floor slab, and the above bottom surfaces on both sides of the gap are formed. A load-receiving plate is erected across the gap, and the top surface of the deck slab and the joint section are continuously paved on the top surface of the deck slab and between the side surfaces of both notched steps, respectively, and the top surface of the deck slab and the joint section are continuously paved. The top surface of each pavement should be flush with each other, the thickness of the pavement on the load receiving plate in the joint pavement should be at least twice the thickness of the pavement on the top surface of the deck slab, and the upper part should be buried in the joint pavement and the lower part in the floor slab. A road joint characterized in that the joint pavement and the floor slab are connected by a connecting member.