JPS621041B2 - - Google Patents

Description

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

Conventionally, joint members made of rubber, steel plates, etc. are installed at road joints, with an elastic absorbing part between a pair of fixed parts, but a part of the joint member is exposed to the road surface and There is a boundary between the concrete part that fixes the joint member and the asphalt pavement, which are made of different materials. For this reason, conventionally, due to the difference in the degree of wear on the road surface due to rutting, a difference in level occurs at the boundary between the joint member and the concrete section, or between the concrete section and the asphalt pavement section, which impedes vehicle drivability, and at the road joint. There were problems with road pollution such as vibrations, noise, and low frequencies.

Therefore, as previously disclosed in Japanese Patent Publication No. 55-32123, the present inventor fixed a pair of horizontal substrates with uneven end surfaces to the upper surfaces of opposing floor slabs by meshing them with each other, and fixed them at the road joint. We developed a joint in which the pavement was applied in a series to improve vehicle running performance, but the pavement at the joint was displaced by the force in the bridge length direction from the tires of passing vehicles, causing bulges and cracks in the paving material. There still remained the problem that the pavement at the joint was thin, at 50 to 80 mm, and could not sufficiently absorb the expansion and contraction of the deck slab.

In view of this point, the present invention has been made by researching the effects of the expansion and contraction of the floor slab on the pavement above the interlocking parts when the convex parts of the two horizontal boards are in a meshing state, and The direction in which the pavement is relatively displaced on the top surface of the convex portion matches the direction in which the pavement is pulled by the top surface of the convex portion on the other horizontal substrate. It was discovered that the upper surface of the convex part promotes this displacement, causing a large local displacement, which causes the pavement to peel off from the horizontal substrate when it cracks, and was developed to solve this problem.

That is, in the present invention, a pair of horizontal substrates having uneven end surfaces are installed at opposite ends of the floor slab so that the convex and concave end surfaces face each other, and the convex portions of each of the two end substrates are Protrusions are provided on the top surface, and by using these projections to fundamentally cut off the displacement of the pavement on the top surface of each convex part, the top surface of one convex part promotes the displacement of the pavement on the top surface of the other convex part. This prevents the paving material from peeling off and falling out even if the pavement cracks.

Embodiments of the present invention will be described below with reference to the drawings.

1 is the joint of the road, and the gap 2 at the road joint
A lower joint means 5 is provided by forming notch steps 4, 4 at the ends of the floor plates 3, 3 facing each other, and a joint paving 6 is formed between the two notch steps 4, 4 on the upper surface 7 of the deck slab. This was done in series with floor slab paving 8 and 8.

That is, in the cutout step portions 4, 4, 10
is a substantially horizontal bottom surface lower than the upper surface 7 of the deck slab, 11 is a side surface separated from the deck end surface 12 in the bridge length direction,
The depth of the bottom surface 10 above from the top surface 7 of the slab is 50 to 100
It is about mm.

Further, in the lower joint means 5, 13 is the floor slab 3
14 is a horizontal board fixed to the anchor bolt 13 together with a seal plate 15 extending between the bottom surfaces 10 of both notch steps. .

The horizontal substrates 14, 14 have protrusions 14b provided on one side of the base 14a at intervals in the road width direction, so that the end surfaces are uneven. It is arranged. On the upper surface of the base and the upper surface of the convex portion of the horizontal substrate 14,
Projections 16 and 17 are provided respectively. Both protrusions 16 and 17 are intended to prevent the joint pavement 6 from slipping, and in this example, they are constructed by reinforcing bars with a diameter of about 15 to 20 mm arranged in the road width direction and welded to the horizontal substrate 14.

The seal plate 15 is a flexible plate with a central elastic part
It is bent into a character shape and positioned in the play space 2, and both side fixing parts are arranged on the bottom surfaces 10, 10 of the two notched step parts 4, 4. A filling material 18 such as liquid rubber sealing material, tar, etc. is filled between the end surfaces of the two horizontal substrates 14, 14, that is, between the meshing gaps and on the central expansion/contraction portion of the seal plate 15.

The joint pavement 6 and the slab pavement 8 are each formed by pouring paving materials that have the same degree of abrasion due to the tires of passing vehicles, and both pavements 6 and 8 are continuous and their upper surfaces are flush with each other. ing. Reference numeral 19 indicates a cut groove formed in the joint pavement 6, and the cut groove 19 may be filled with a filler such as a liquid rubber sealant or tar.

In addition, a rigid plate such as a steel plate, a plastic plate, an FRP (fiber-reinforced plastic plate), or a concrete plate is applied to the horizontal substrate 14, and an asphalt paving material or a goose asphalt paving material is applied to the joint paving 6. It is preferable to do so.
Incidentally, in addition to the above-mentioned paving materials, other paving materials such as cement concrete, resin mortar, and resin concrete may be applied to the joint paving 6, and the joint paving 6 and the slab paving 8, It is more preferable to use the same paving material.

In the above structure, since the joint part pavement 6 and the floor slab part pavement 8 are continuous, the amount of road surface wear such as rutting caused by the tires of passing vehicles is equalized, and good vehicle running performance is maintained for a long period of time. . In addition, since the joint pavement 6 has a thick layer, the load-bearing strength of the road joint increases, and stress such as tension and compression caused by expansion and contraction of the deck slab is dispersed throughout the thick joint pavement 6. Therefore, the occurrence of cracks is suppressed, and even if cracks occur in the lower layer of the pavement at the joint, the cracks are less likely to reach the surface layer of the pavement at the joint.

In addition, the joint pavement 6 expands and contracts due to the expansion and contraction of the floor slab 3.
Alternatively, even if a force is applied in the bridge length direction due to the friction of the tires of a passing vehicle, the protrusions 16 and 1 on the horizontal board 14
7 prevents the paving material from shifting from the horizontal substrate, thereby suppressing the formation of bulges and cracks in the paving material. In particular, with the protrusions 16 and 17 in which reinforcing bars are arranged in the road width direction as in this example, a greater anti-slip effect can be obtained with less material than in the case of erecting short reinforcing bars. Furthermore, since the paving material wraps around below both sides of the protrusions 16 and 17, an even greater anti-slip effect can be obtained. Furthermore, since the upper part of the interlocking part of both lateral boards 14, 14 is the part most affected by the expansion and contraction of the floor slab, since the protrusion 17 is provided on the upper surface of the convex part of the lateral board 14, the upper surface of this convex part can be paved. The shifting movement of the material is reliably prevented, and even if cracks occur in the paving material, the situation where the cracked paving material peels off and spills onto the road can be avoided.

Therefore, the joint pavement 6 is subjected to tensile force due to the contraction of the deck slab 3, and due to the load of passing vehicles, etc., the ends of the girders of the road bridge rotate around the bearings, causing both side When the substrates 14 move up and down relative to each other, they receive shearing force, but this horizontal substrate 1
Even on the upper surface of the protrusions 4 and 14, the paving material has protrusions 1
7 prevents displacement and is fixed, the above-mentioned tensile force and shearing force are applied to both lateral substrates 14,
14, and if cracks occur, they will be wavy. Therefore, when a vehicle passes through a crack, if the crack is linear, the tire will fall into the crack and the vehicle and the joint pavement 6 will be subjected to vibrations or shocks, but in the case of the present invention, the crack is wave-shaped. Therefore, the tire moves from one convex part of the joint pavement 6 that has a crack to the other convex part without causing any substantial drop in the crack, and there is almost no vibration or impact as described above. Good vehicle running performance is maintained, and the cracked portion of the joint pavement 6 does not collapse due to impact, and the cracks are prevented from expanding.

In addition, as in this example, when the tip of the convex portion 14b of the horizontal substrate 14 fixed to one floor slab 3 is extended over the other opposing floor slab 3, the convex portion of this horizontal substrate 14 14b has the effect of preventing the paving material from sinking into the clearance space 2.

As shown in FIG. 3, reinforcing bars with both ends bent downward are fixed to the horizontal substrate 14 to form protrusions 2.
0 and 21, or as shown in FIG. 4, the protrusions 22 and 23 may be formed by fixing a steel member having a U-shaped cross section. Further, the protrusion may be formed by erecting a short straight bar-shaped reinforcing bar, an L-shaped reinforcing bar whose upper end is bent into an L-shape, or a head bolt on the horizontal substrate. When forming protrusions by erecting reinforcing bars, etc. in this way, it is better to arrange the protrusions in parallel in the road width direction so that the spacing in the road width direction is narrower than the distance in the bridge length direction to achieve a better anti-slip effect. It is preferable to make it even larger.

Further, in the above embodiment, the side surface 11 of the notch step portion 4
Although the notch step portion may have vertical side surfaces as shown by the chain line 4a in FIG. 1, the upper surface of the horizontal substrate 14 and the upper surface of the floor slab 7 may be at approximately the same height. Further, the lower joint means may be installed directly on the upper surface of the end of the floor slab without providing a notch step.

Incidentally, the joint 1 of the present invention can be applied not only to steel bridges in which deck slabs are provided on steel girders, but also to other road bridges such as prestressed concrete girder bridges, reinforced concrete girder bridges, and steel deck slab bridges. It is.

As described above, according to the present invention, since road surface wear due to rutting and the like occurs uniformly at road joints, good vehicle running performance can be maintained over a long period of time. By providing protrusions on the surface of the pavement to prevent the pavement from shifting on the top surface of these convexities, it is possible to reliably avoid large local shifts in the pavement at joints and cracked pavement material from peeling off and flying out. Furthermore, when the joint pavement is made thicker, the excellent effect of suppressing the occurrence of cracks can be obtained. Even if cracks occur in the joint pavement, the cracks are wave-shaped, so that good vehicular drivability can be maintained and cracks can be prevented from expanding.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a cross-sectional view in the bridge length direction showing the road joint, FIG. 2 is a plan view of the road joint showing the state before paving is poured, and FIGS. FIG. 4 is a perspective view illustrating a protrusion. 1...Joint, 2...Playroom, 3...Floor slab,
4... Notch step, 5... Lower joint means, 6... Joint paving, 7... Upper surface of deck slab, 8... Deck slab paving,
14...Horizontal substrate, 14c...Convex end surface, 14d...
Concave end surface, 16, 17, 20, 21, 22, 23...
...Protrusions.

Claims (1)

[Claims] 1. A pair of horizontal substrates each having an uneven end surface are installed at opposite end portions of the floor slab with a gap between the road joints, with the convex and concave end surfaces facing each other, and the convex portion of the horizontal substrates is A road joint characterized in that a projection is provided on the upper surface, and joint paving is applied on the pair of horizontal substrates and between the two horizontal substrates in a continuous manner with the pavement on the upper surface of the deck slab. .