JPS6041162B2 - Construction method of road joint expansion and contraction device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of constructing a road joint expansion and contraction device.

Road bridges such as bridges and elevated roads are equipped with a pair of corrugated end plates a and a, as shown in Figure 3, in order to prevent tires from falling when the wheels pass through road joints. Expandable devices with post-cast concrete b placed on the back are widely used.

This type of expansion/contraction device has a wave-shaped clearance c, so that tire depression is small and the running performance of the vehicle is good, but it is difficult to construct. That is, when pouring concrete b onto the back of the corrugated end plate a, in order to prevent concrete leakage, a weir plate f standing up from the bottom of the notch step e is fixed at the lower end. The bottom surface of step e is generally uneven, so it is difficult to fix the weir plate, and gaps tend to form between the bottom surface of step e and shear plate f, which requires a lot of time and effort to install. There is. Moreover, since the post-cast concrete b is divided into the front part of the weir plate f, that is, the back part g on the convex side of the corrugated end plate a, and the back part h of the weir plate f, there is a problem that the strength of the concrete is reduced. . In view of this, an object of the present invention is to provide a method for constructing a road joint expansion/contraction device that can be constructed easily and quickly without using the above-mentioned weir plates. That is, in the present invention, a gap insertion material made of styrofoam material or the like is inserted between the paper grain gaps, and a vertical end plate with a cushioning material fixed to the bottom surface is placed on top of the gap insertion material so that the upper green edge is higher than the road surface. This vertical end plate is pressed down together with the gap insertion material, and the gap insertion material is press-fitted into the gap so that the insertion depth becomes deep, and the vertical edge is compressed by compressing the cushioning material. It is characterized in that the upper edge of the face plate is aligned with the road surface, and a concrete material is cast on the back surface of the vertical end face plate. In other words, the upper end edge of the vertical end plate is accurately positioned at a desired height by increasing the insertion depth of the play material and by compressing the cushion material. Embodiments of the present invention will be described below based on the drawings.

This example is shown in FIGS. 1 and 2, and 1 is a road joint expansion/contraction device formed by applying the construction method according to the present invention.

Reference numeral 2 denotes a foamed polystyrene gap insertion material inserted into the seam gap 3 in the form of a rectangular parallelepiped, on which a pair of corrugated end plates 5, 5 are layered with a cushioning material 4 interposed therebetween.
The convex portions 5a and concave portions 5b of the corrugated end plates 5, 5 are opposed to each other, and between them, an elastic plate 6 having a U-shaped cross section formed of a flexible material such as rubber extends both sides of the corrugated end plates. The end faces are baked and interposed, and concrete materials 7, 7 are pounded on the back. 8 is a concrete slab, and 9 is a pavement.

Next, a method of constructing the road joint expansion/contraction device 1 will be explained based on FIG. 2.

Concrete slabs 8, 8 facing each other with a joint clearance 3
Notch step portions 10, 10 are formed at the ends by box punching or notching.

Subsequently, the gap insertion material 2 is inserted into the seam gap 3 from above to seal the seam gap. The gap insertion material 2 has a slightly wider inside than the seam gap 3, and the upper surface of the gap insertion material when inserted into the seam gap 3 is positioned above the bottom surface of the notch step IQ. The height of the gap insertion material 2 is set so that the upper ends of the corrugated end plates 5, 5 placed thereon extend 10 to 2 scales above the surface of the pavement 9.

The corrugated machine face plates 5, 5 are provided with cushioning material 4 on the bottom surface in advance.
is fixed, and a telescopic plate 6 is attached between the slopes of both end faces, and a hanging angle is attached to the upper end.

These corrugated end plates 5, 5 are connected to the cushion material 4 and the elastic plate 6.
With the hanging angle and hanging angle attached, place it on top of the gap insertion material 2, so that the upper edge of the corrugated end plates 5, 5 is on the pavement 9.
Press down until it matches the surface height of, or slightly lower than, the surface height. At this time, the gap insertion material 2 is
The cushion material 4 is press-fitted below the free space 3, and the cushion material 4 is also compressed to be in close contact with the space insertion material 2. Incidentally, when setting the height of the corrugated end plates 5, 5, the above-mentioned hanging angle is used.

That is, the suspension angle is formed long in the bridge length direction, the lower edges of both ends are aligned with the upper edges of the corrugated end plates 5, 5, the corrugated end plates 5, 5 are pushed down, and both ends of the suspension angle are paved. 9, the upper edges of the corrugated end plates 5, 5 are made to match the surface height of the pavement 9.
After adjusting the height of the corrugated end plates 5, 5 as described above, the anchor bars 11 are made to protrude from the back surface of the corrugated end plates.
, 11 are welded together with the through reinforcements 12 to the U-shaped reinforcements 13 that protrude from the bottom of the groove 0, and a concrete layer 7 is placed on the back of the corrugated end plate to a height that matches the surface height of the pavement 9. Complete the construction of the road joint expansion device by pouring.

14 is a distribution muscle.

In the above construction, when the corrugated end plates 5, 5 are pushed down,
The end surfaces of the floor slabs 8, 8 have small irregularities and are high, exhibiting sliding resistance, and the gap insertion material 2 may not go down to a predetermined depth and stop midway, but in that case, the cushion material 4 is compressed. The green height of the upper end of the corrugated end plates 5 and 6 matches the height of the road surface.

In other words, if there is no cushion material 4, the space insert material 2 will be forced down, which requires excessive force and makes it difficult to finely adjust the height of the upper end of the corrugated end plate 5.
In addition, in the above construction, the joint gap 3 and the corrugated end plates 5 and 5 are formed by the gap insertion material 2 and the cushion material 4.
Since the gap between the lower end of and the bottom of the notch step 10 is closed,
There is no fear that the poured concrete material 7 will leak into the joint gap 3.

In this example, by applying the cushioning material 4, the entire center of the corrugated end plates 5, 5 is wider than the lateral center of the play insert material 2, and both sides of the corrugated end plate are offset from both sides of the play insert material 2. Even if the corrugated end plates 5, 5 come out, the bottom surfaces of the corrugated end plates 5, 5 are sealed by the cushioning material 4, so that the concrete material 7 does not flow into between the corrugated machine surfaces 5, 5 when concrete material 7 is poured.

In addition, this cushioning material significantly improves the adhesion between the corrugated end plate and the gap insertion material. The present invention is applicable not only to steel bridges formed by pouring concrete slabs 8 onto steel girders, but also to other monuments such as PC (prestressed concrete) bridges and RC (reinforced concrete) bridges. can do. In addition, as the vertical end plate, in addition to the corrugated end plate 5 shown in the above embodiment, a flat end plate without a bent portion may be used.
The cushion material 14 may be molded from a foamed plastic material or a rubber material other than foamed polystyrene, and the cushion material 14 may also be molded from a stretchable material other than rubber material such as urethane foam. As described above, according to the present invention, the height of the upper end of the vertical end plate can be accurately and easily positioned by simply pushing down the vertical end plate by inserting the play space insertion material into the play space and compressing the cushion material. , it is possible to significantly reduce the labor and time required for construction without separately providing a weir plate to prevent concrete leakage into the gap.

[Brief explanation of drawings]

FIGS. 1 and 2 illustrate embodiments of the invention;
The figure is a perspective view showing a cross section in the bridge length direction of the road joint expansion and contraction device, Figure 2 is a cross section in the bridge length direction showing the state before pouring concrete, and Figure 3 is a perspective view showing the road joint expansion and contraction device in the bridge length direction. It is a perspective view shown in a direction cross section. 1... Road joint expansion/contraction device, 2... Spatial insertion material,
3... Seam gap, 4... Cushion material, 5... Corrugated end plate, 7... Concrete material. Article 1 Diagram Tea 2 Diagram Tsutomu J

Claims (1)

[Claims] 1. A cutout step is formed at the opposite end of the road with a gap between the road joints, and a gap insertion material made of styrofoam material or the like is inserted into the gap to close the gap and insert the gap. A pair of vertical end plates are arranged so that the height of the upper surface of the material is located above the bottom surface of the notch step, and are placed above the spacer insertion material, facing each other at a predetermined distance, and having a cushion material fixed to the bottom surface. It is placed so that its upper edge is located above the road surface, and both vertical end plates are pushed down together with the gap insertion material, and the gap insertion material is press-fitted into the gap so that its insertion depth becomes deep. , by compressing the cushion material, the upper edges of both vertical end plates are aligned with or close to the road surface, and a concrete material is cast on the back of the vertical end plates. How to build the device.