JPS6049723B2 - road joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint constructed at a joint of a road bridge such as a concrete girder bridge or a steel bridge.

Conventionally, steel finger joints, rubber joints, etc. have been installed at road joints, but the joint members installed opposite each other with a gap between the joints are exposed to the road surface, and the joint members are There is a boundary between the fixed concrete part and the asphalt pavement, which are made of different materials, and a step is created at the boundary due to the difference in the degree of wear of the road surface due to rutting, which impedes vehicle driving performance and causes vibrations at the road joint. , there was a problem of road pollution caused by noise and low frequencies.

In addition, when replacing joint members, the repair process requires a lot of time and trouble, such as removing the concrete and anchor bars, and there are problems in that it requires traffic closures for a long time. Ta. Also,
There is also a method known as a blind area joint, in which bridge decks are constructed across the gap between opposite ends of the deck slabs at the road joint, and paving is applied continuously, but due to the difference in the amount of expansion and contraction between the deck slabs and the pavement, it is difficult to do so in a short period of time. It is a shame that cracks in the pavement occur between the two. In view of the above, the present invention forms a notched step at the opposite road end with a clearance between the road joints, and connects the joint concrete with a flat top surface to the center between both notched steps via a bridge plate. Also,
By placing elastic members on both sides of the joint and paving the joint on top of the joint concrete and the elastic member in series with the upper surface pavement of the vestibule, vehicle running performance is improved. By allowing vertical movement relative to the road edge without having a fixed relationship, the vertical movement of the road edge due to the deflection of the road bridge and the expansion and contraction in accordance with the span of the road bridge can be prevented on both sides of the joint concrete. It is an object of the present invention to provide a road joint in which the elastic member can accept or absorb the water.

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

<Example 1> This example is shown in FIGS. 1 and 2.

Reference numeral 1 is a road joint, in which a cutout step 4 is formed at the end of prestressed concrete girders 3, 3 facing each other with a clearance 2.
4, a lower expansion/contraction means 5 is provided between both notched steps, and a joint paving 7 and a floor slab upper surface paving arrangement are continuously applied on the lower expansion/contraction means 5 and the floor slabs 6, 6. .

The prestressed concrete girder 3 has an upper flange 11 and a lower flange 12 connected to the upper and lower sides of a web 10, respectively, and has a single-character shape in cross section.

Filler concrete 13 is placed between the upper flanges 11 and 11, and the filler concrete 13 is placed between the upper flanges 11 and the filler concrete 1.
Remaining concrete 14 is placed on top of 3, and the upper flange 11, filler concrete 13, and additional concrete 14 constitute the floor slab 6. The notched step portion 4 is formed by removing the upper flange portion of the end of the prestressed concrete girder, and has a substantially horizontal bottom surface 15 located near the upper edge of the web 10 and a side surface separated from each other in the bridge length direction from the gap 2. 16.

In addition, 17 is end filler concrete, which is poured at the end of the prestressed concrete girder 3 in series with the filler concrete 13 from the upper end to the lower end of the prestressed concrete girder 3. The lower expansion/contraction means 5 includes mats 19, 19 laid on the bottom surfaces 15, 15 of the notched steps 4, 4, a bridge board 20 built over both mats 19, 19, a joint concrete 21 on the bridge board 20, and a joint. It is composed of an elastic member 22 provided between the concrete 21 and the notch step side surface 16.

The rug 19 is made of a leveling mortar or an elastic material such as rubber or resin sponge, and has a thickness of 10W1m1.
Bridge length direction width 65T! It's about $l. The bridge board 20 is formed from a rigid plate 5 such as a steel plate, and has a thickness of about 3wt1 and a width of about 18mm in the bridge length direction. The joint concrete 2.1 is made of coarse-grained asphalt concrete and is movable up and down relative to the prestressed concrete girder 3, and has approximately the same width as the bridge deck 20, and has a flat Z top surface and a flat top surface of the deck slab. are made to the same height. Elastic member 22
is made of resin sponge material and has a width of 35T in the bridge length direction! Rm, the height is from the bottom surface 15 of the notch step to the top surface of the floor slab, and the outer surface is bonded to the side surface 16 of the notch step with an adhesive. The joint pavement 7 and the upper surface pavement of the slab are made of dense-grained asphalt concrete.
Pavement thickness is 50~807717! The joint pavement 7 is provided with kerfs 23. In construction, first, the threaded sleeve 24 is fixed to the bottom surface 15 of one of the opposing notch steps 4, that is, in this example, the web 10 of the prestressed concrete girder 3.

Subsequently, rugs 19, 19 are placed on both bottom surfaces 1) 5, 15. A bolt through hole is provided in the mat 19 on which the threaded sleeve 24 is provided. Thus, the bridge board 20 is bridged over both the mats 19, 19, and the threaded hole sorb 2
Bolts 25 are applied to 4 to fix the bridge plate 20. Next, after adhering the elastic member 22 to the side surface 16 of the notch step 4, coarse-grained asphalt concrete is poured to form the joint concrete 21 to constitute the lower elastic means 5, and the lower elastic member 5 is placed on top of the lower elastic member 5. Apply joint paving 7. In this example, the bridge board 20 is fixed with bolts 25, but if a wide bridge board is used and there is no risk of the bridge board falling off under the gap, fixing with bolts is not necessarily required.

In addition, by constructing the lower expansion/contraction means 5 before paving the upper surface of the deck slab, the upper surface paving of the deck slab and the joint part paving 7 may be successively performed at the same time. In the above structure, the prestressed concrete girder 3 bends under the load of passing vehicles, and the end facing the road joint moves up and down, but since the joint concrete 21 is not fixed, one prestressed concrete girder 3 bends and moves up and down. It is not directly transmitted from the concrete girder 3 to the other prestressed concrete girder 3, but is absorbed by either one of the elastic members 22, 22.

Further, both elastic members 22, 22 absorb expansion and contraction of the prestressed concrete girder 3. Then, the wheel load is distributed to both prestressed concrete girders 3, 3 via the joint concrete 21 and the bridge deck 20. Note that it goes without saying that the joint concrete 21 may be formed of cement concrete.

Further, in the above embodiment, extra concrete 14 was cast on top of the upper flange 11 of the prestressed concrete girder 3, but extra concrete was not placed and the upper flange 1
Paving may be applied directly on top of 1.

Furthermore, although the above embodiment applies the present invention to a prestressed concrete girder bridge, a structure similar to that of the above embodiment can be adopted also in a reinforced concrete girder bridge.

Example 2 This example is shown in FIG. 3, in which a joint 30 is constructed at a road joint of a steel bridge in which a concrete slab 32 is provided on a steel girder 31.

The notched step portion 33 is formed at the end of the floor slab 32, and the threaded sleeve 24 is fixed to the floor slab 32 below the notched step.

Other configurations such as the lower expansion/contraction means 5, the joint paving 7, and the upper surface paving device of the deck slab are the same as in the first embodiment. The present invention
With the above configuration, the joint pavement and the upper surface pavement of the deck slab are continuous, so road surface wear due to rutting occurs uniformly, and good vehicle running performance is obtained, and the joint concrete is placed relative to the road edge. Since elastic members are placed on both sides of the road so that it can move up and down, these elastic members allow or absorb not only the expansion and contraction of the road but also the vertical movement of the road edge caused by the flexure of the road. This prevents damage, and since the joint concrete is supported by both opposing notch steps, the wheel load is distributed to both opposing road edges via the joint concrete and bridge plates, reducing the load on each road edge. In addition, the upper surface of the joint concrete is flat and the thickness of the joint pavement is approximately constant, making the overall strength approximately uniform, improving the durability of the road joint. Even if the joint pavement cracks due to aging, etc., it has the excellent effect of being easily repairable by filling with paving material or raising the surface of the pavement.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a sectional view in the bridge length direction showing a road joint of Embodiment 1, and FIG.
FIG. 3 is a partially cutaway cross-sectional view taken along the line ■-■ in the figure, and FIG. 3 is a cross-sectional view in the bridge length direction showing the road joint of the second embodiment. 1,30...Road joint, 2...
- Play space, 3... Prestressed concrete girder, 4, 33... Notch step, 5... Lower expansion/contraction means, 6, 32... Floor slab, 7... ... Joint paving, 8... Top surface of floor slab, 15...
Bottom, 16... Side, 19... Rug,
20... Bridge plate, 21... Joint concrete, 22... Elastic member, 31... Steel girder.

Claims (1)

[Scope of Claims] 1. In road bridges such as concrete girder bridges and steel bridges in which concrete slabs are cast on steel girders, the upper surface of the slab is placed at the end of the road joint facing each other across the gap between the road joints. A notch step is formed having a substantially horizontal bottom surface lower than the gap, and side surfaces facing each other that are spaced apart from each other in the bridge length direction, and a bridge plate is bridged over the bottom surfaces of both the cutout steps, and a bridge plate is placed on the bridge plate. Joint concrete having a flat top surface is provided with a gap between the side surfaces of both the notch steps and is movable up and down relative to the end of the road joint, and an elastic member is interposed in the gap to form a joint. A road joint characterized in that a joint part pavement is applied on the concrete and the elastic member, and a floor slab top surface pavement is applied to the top surface of the deck slab, and the joint part pavement and the deck top surface pavement are made into a series. 2. The road joint according to claim 1, wherein the joint concrete is formed of asphalt concrete.