JPS5985002A - Road joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to road joints.

Conventionally, steel finger joint members, rubber joint members, and the like have been installed at road joints. In the former method, a pair of finger plates are installed opposite each other with a gap, but during construction, it takes time to adjust the distance between both finger plates and the height of the plate to obtain flatness. The problem is that the plates tend to break when subjected to large wheel loads. The latter consists of a rubber plate with a telescopic section in the center, with attached parts on both sides, fixed to the floor slab with anchor bolts along with a horizontal rigid plate, leaving a gap to bridge opposing road edges. The center stretchable part of the rubber plate tends to bend downward under wheel load, which poses a problem in vehicle running performance.

In addition, there are also so-called blind joints where pavement is applied continuously at road joints, and the pavement tends to cave in between the joints, and cracks that occur in the pavement between the joints due to expansion and contraction of the road. It spreads easily and requires frequent repairs.

In view of this, the present invention provides a road joint of the blind ground joint type in which paving is continuously applied to road joints, and which has high load-bearing strength and does not cause the pavement to cave in or fall off.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

In Figure 1, 1 is the road joint, and the lower joint 2
A series of paving 6 is applied on top of the paving.

In the lower joint 2, 4, 4 are notch steps formed at the ends of the opposing deck slabs 6, 6 with a joint gap 5, and a joint member 7 is formed in the center between both the notches 4, 4. Post-cast concrete 8.8 is placed on both backs of the joint member 7, that is, on the notch steps 4, 4.

The joint member 7 includes a box 9 composed of a bottom plate 10 and a pair of vertical plates 12 and 12 facing each other with a gap 11 wider than the joint gap 5 above the bottom plate 10. Inside, there is a filler 1 supported on the top surface of the bottom plate 10.
3, and an anchor member 14 is provided on the back side of the vertical plate 12.

The release plate 10 is formed wider than the vertical seam gap 5, and is installed on both sides thereof or on the bottom surface of the notch steps 4, 4, straddling the seam gap 5. The vertical board 12 has a substantially vertical board surface bent in a waveform in the road width direction as shown in FIG.
It is supported on the upper surface of the bottom plate 10 so as to be movable in the bridge length direction. The filler 16 is concrete, asphalt, or foamed concrete IJ-1-.

It is composed of seven civil engineering materials such as plastic, rubber, and crushed stone, or a combination of these. This filling material 16 can be constructed by filling a pre-assembled box 9 with a civil engineering material, or by forming a block body to serve as a filler with the civil engineering material in advance and placing the block body on the bottom plate 10. In some cases, a vertical plate 12° 12 is provided on the bottom plate 10.

In addition, in Fig. 1 and Fig. 2, 15 is the gibber muscle;
16 is a main reinforcement, and 17 is a cut groove provided in the pavement 3.

In the above structure, the bottom plate 10 slides relative to the bottom surface of the cutout step 4 due to expansion and contraction of the road.

Since the vertical plate 12 is fixed to the post-cast concrete 8 by the anchor member 14, it slides on the bottom plate 10 in the bridge length direction as the road expands and contracts. The filler 13 is affected by the expansion and contraction of the road because the width of the gap 11 between the vertical plates 12, 12 changes. When a concrete block is used as the filler 16, the amount of expansion and contraction absorbed by the block is extremely small, so if the expansion and contraction of the road exceeds the absorption amount, cracks will occur in the block. 12, and no cracks occur in the post-cast concrete 8. That is, cracks caused by expansion and contraction of the road can be suppressed only by the filler material 13.

When asphalt, foamed concrete, rubber, etc., which are softer than concrete, are used as the filler 13, the expansion and contraction of the road is absorbed by the filler 16, and cracks in the filler 16 are small or do not occur. Furthermore, if granules such as crushed stone are used as the filler 13, the granules can move as appropriate;
The movement of particles causes the road to expand or contract.

On the other hand, the wheel load when a vehicle passes through the pavement 6 acts on the lower joint 2, and the wheel load is transmitted from the bottom of the cutout steps 4, 4 to the floor slab 6, through the filler 13 and the bottom plate 10. distributed to That is, since the bottom plate 10 is bridged over the notch steps 4, 4, and the filler 16 is supported by the bottom plate 10, the filler 16 does not cave in due to wheel loads, and thus the pavement 6 does not cave in.

Furthermore, even if cracks occur in the filler 16, the filler 1
Since the pavement 6 is provided on the pavement 3, there is no problem with the running of the vehicle, and the pavement 3 only needs to be repaired as necessary if cracks occur in the pavement 3.

In some cases, only one side of the bottom plate 10 is fixed to the floor slab 6 on which it is placed, using an anchor or the like to eliminate the risk of the bottom plate 10 falling into the joint gap 5. Alternatively, one vertical plate 12 may be fixed to the bottom plate 10, and only the other vertical plate 12 may slide on the bottom plate 10. Further, the vertical plate 12 may be a flat plate extending linearly in the road width direction.

Furthermore, in the above embodiment, the filler 13 is made to be the same height as the vertical board 12, or the height of the filler 13 is made lower than the vertical board 12, and a part of the pavement 2 is placed between both the vertical boards 12 and 12. It may be placed on top of the filler material 13.

Furthermore, in the above embodiment, the upper end of the vertical board 12 is made to match the height of the upper surface of the floor slab 6, or the upper end of the vertical board 12 is made higher than the upper surface of the floor slab 6 and embedded in the joint pavement 3b. In some cases, it is lower than the upper surface of the floor slab 6.

Next, a method of constructing the road joint 1 will be explained.

Box 9 near the factory or construction site.
A joint member 7 filled with a filler 13 is formed.

This joint member 7 is connected to a pair of vertical plates 1 on the bottom plate 10.
2 and 12 are opposed to each other with a clearance 11 between them, and both vertical plates 12.
It may be formed by filling the space between 12 and 12 with civil engineering material, and
It may be formed by placing a block body formed of a civil engineering material on the bottom plate 1D and supporting the vertical plates 12, 12 on the bottom plate 10 so as to sandwich the block body.

The anchor member 14 may be fixed to the vertical plate 12 in advance, or may be fixed to the vertical plate 12 after the bottom plate 10, the vertical plate 12, and the filler 16 are assembled.

When this joint member 7 is formed at a place other than the construction site, such as a factory, it is transported to the construction site.

During transportation, it is preferable to temporarily fasten the bottom plate 10 and the vertical plate 12 to prevent damage to the joint member 7.

Subsequently, at the construction site, cutout steps 4, 4 are formed at the ends of the floor slabs 6, 6, which face each other with a joint clearance 5 between them. The notched stepped portion 4 may be formed after the floor slab 6 is cast.Also, by providing a formwork in advance at the position where the notched stepped portion 4 is to be formed and pouring the floor slab 6, the so-called It may also be formed by a box cutting method.

Subsequently, the notch step portion 4 facing the joint member 7,
A bridge is provided across the joint gap 5 on the bottom surface of 4.

Then, the anchor member 14 of the joint member 7 is connected to the dowel bar 15 together with the main bar 16, and the post-cast concrete 8,
8 to form the lower joint 2.

After that, a paving 6 is applied on the lower joint 2, and grooves 17 are formed in the paving 6 as necessary. In addition, the following two methods can be used when paving. One of them is
After forming the notch step portion 4 and before installing the joint member 7, temporary paving on the floor slab top surface paving 6a and the notch step portions 4, 4 is performed successively, and then the temporary paving is removed. This method involves installing the joint member 7 and then applying the joint paving 3b on the lower joint 2. The other method is to first install the joint member 7 after forming the cutout step portion 4, and then sequentially apply the deck upper surface pavement 3a and the joint portion pavement 6b.

In the construction method described above, since the joint member 7 is formed in advance and assembled to the road joint, the work at the construction site is simplified, especially the height adjustment of the joint member 7 and the spacing between the vertical plates 12, 12. Since no adjustment is required, construction can be carried out quickly.

The joint member 7 is not limited to the one described in the second embodiment, and other joint members shown in FIGS. 3 to 2 may be used.

That is, in the joint member 21 shown in FIG.
Furthermore, a protrusion 23a s 23a is provided at the upper end of the vertical plate 23.
25 is fixed, and a filler 27 is filled in the box 2 O which is composed of the bottom plate 22 and the vertical plates 23 and 23.

The partition portion 22a of the bottom plate 22 functions to prevent the vertical plate 26 from falling off the bottom plate 22 when it moves due to expansion and contraction of the road. The protrusion 23a at the upper end of the vertical plate 26 has a filling material 27
When a crack occurs in the pavement, it acts to prevent the cracked fragments from flying upward, and when the crack spreads from the filler 27 to the pavement, the range in which the crack spreads is limited to between the protrusions 23a and 23a. be done. The elastic body 24 inside the partition part 22a has the function of holding the vertical plate 23 in an upright state, preventing post-cast concrete from entering between the partition part 22a and the vertical plate 23, and preventing the sliding of the vertical plate 23. It has the effect of smoothing movement. Elastic body 25 outside the partition portion 22a
When sliding on the bottom plate 22 or the bottom surface of the notch step, the partition part 22
Prevent interference between a and post-cast concrete. In addition, the elastic bodies 24 and 25 are installed after the bottom plate 22 and the vertical plates 23, 23 are assembled and installed at the construction site, or after the filler material 2
7 may be filled, a liquid rubber sealing material or the like may be poured into both sides of the partition portion 22a of the bottom plate 22.

The joint member 61 shown in FIG. A bridge board 65 is placed across the gap 34. Vertical board 36
．． 36 is provided with connecting lines 37 and 37 on the opposing inner surfaces thereof, and is fixed to the vertical portions of the mold plates 33, 33. A filler 69 is filled in the box 38, which is made up of the bottom plate 62 and the vertical plates 36, 36. When installing the joint member 61, each of the templates 63 and 36 is placed on the notch step. Joint member 31 of this example
Since the bottom plate 32, the vertical plate 66, and the filler material 69 are all connected, there is no need to temporarily fix the joint member 31 during transportation, and there is less chance of damage.

In the joint member 41 shown in FIG. 5, the vertical plates 43, 43 provided on the bottom plate 42 are inclined in a V-shape with the distance between their upper ends narrower (11) than the distance between their lower ends. A box 44 constituted by the vertical plates 43 and 43 is filled with a filler material 45. Furthermore, connecting lines 46 and 46 are provided on opposing surfaces of the vertical plates 43, 43 to connect with the filler material 45. In the joint member 41 of this example, the filling material 45 is prevented from popping out upward, and the third
Similar to the joint member 21 shown in the figure, the range in which cracks spread to the pavement becomes narrower.

The joint member 51 shown in FIG. 2 has a bottom plate 52 and a vertical plate 5.
A filling material 55 filled in a box 54 consisting of 55.53 is constructed by stacking an elastic layer 55a made of rubber or the like and a filling layer 55b of low elasticity such as concrete in the bridge length direction. The joint member 51 of this example has an elastic layer 55a
This increases the expansion and contraction absorbability of the filler 55 and suppresses the occurrence of cracks. In the illustrated example, the elastic layer 55a is provided at three locations, but it may also be provided only at/locations between both vertical plates 53, 53.

In the joint member 61 shown in FIG. 7, (12) the bottom plate 62 is L-shaped, one vertical plate 66 is fixed to the vertical page part 62a of the bottom plate 62, and the other vertical plate 64 is fixed to the bottom plate 62.
The bottom plate 62 is movably supported on the horizontal portion 62b of the
A box 65 composed of a vertical plate 63 and 64 is filled with a filler 66.

Elastic bodies 67 are provided on the outside of the vertical plate 64 and at the end of the horizontal portion 62b of the bottom plate 62.

In the joint member 71 shown in FIG. 2, 72 is a bottom plate, 73.73 is a vertical plate, and the bottom plate 72 is constructed by slidingly overlapping a left plate 72a and a right plate 72b. The right plate 72b is made integral with vertical plates 73 and 73, respectively, and a box 74 made up of the bottom plate 72 and the vertical plates 73, 73 is filled with a filler 75. In the case of this example, the width W of the box 74 is equal to or slightly narrower than the interval between the seam gaps 5.

Of course, the width W may be wider than the seam clearance 5.

In the joint member 81 shown in FIG.
Leg portions 82b are provided at both ends of the horizontal portion 82a.

The leg portion 82b is provided with a leg portion 82b.

82b is grounded to the bottom surfaces of the notch steps 4,4.

Vertical plates 83, 83 are movably supported on the upper surface of the horizontal portion 82a, and a box 84 made up of the bottom plate 82 and the vertical plates 83, 83 is filled with a filler 85. In the joint member 81 of this example, since the contact area between the bottom plate 82 and the bottom surfaces of the cutout steps 4, 4 is small, the bottom plate 82 and the floor slab 6 tend to move relative to each other. In addition, the center of the span of a road bridge bends downward with the piers at both ends as the fulcrum 7 due to the load of passing vehicles, and as a result, one end of the road bridge that faces the road joint is more get higher,
In other words, there may be differences. In this case, the joint members 81 are leg portions 82a at both ends of the bottom plate 82.

Since the leg portions 82a are supported by the cutout step portions 4, 4, even if the above-mentioned difference in level occurs, both legs 82a, 82a are supported by the cutout step portions 4, 4.
The joint member 81 can be kept in a grounded state on the bottom surface, and even if one side of the joint member 81 is lifted, the other side will not be lifted, and vertical fluctuations will be reduced.

Note that the joint member may be constructed by appropriately combining those shown in Figs. , PC girder bridge, RC girder bridge, etc.

As described above, in the joint of the present invention, since the filler material of the lower joint and the post-cast concrete are separated by vertical plates, the post-cast concrete is not affected by cracks in the filler material, and the pavement is Since it is supported by the filler above the gap, the pavement will not collapse or fall off due to the wheel load caused by passing vehicles, and good vehicle running performance can be maintained for a long period of time.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a cross-sectional view of a road joint section cut in the bridge length direction, and FIG. 2 is a sectional view of the road joint section before pouring concrete and pavement. The plan view and FIGS. 3 to 2 are sectional views showing the joint member, respectively. 1...road joint, 2...lower joint, 3...paving, 4
......Notch step, 5... Seam play, 6.
...Floor slab, 7.21.31.41.51.61゜71.81...Joint member, 8...
・Post-cast concrete, 9. 26. 38.44,54
．． 65. 74.84... Box, 10, 22, 32° 42.52.62.72.82... Bottom plate, 11
・・・・・・Play, 12.23.36.43.53.6
3. 64.73.83・・・Vertical board, 13.27.39
. j5.55,6+6.75.85... Filler (
15) 2nd Figure 76 72 77 10 16474 4 3 4 515 (16) 3rd n Taku 4 Figure 5 Ship Figure 6

Claims (1)

[Claims] (11 A notch step is formed at the end of the road facing each other with a gap between the road joints, and a bottom plate is formed between both the notches and a pair of vertical plates facing each other with a gap on the bottom plate. The box is filled with a filler material, and post-cast concrete is poured into the notched steps on the backs of both vertical plates to form a lower joint. A road joint characterized by having pavement on top of it.