JPH0257602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a road joint, and is constructed at a joint of a road bridge such as a bridge or an elevated road.

(Prior Art) As an example of a road joint, as described in Japanese Patent Application Laid-Open No. 58-58307, a movable gangplank is straddled in the bridge length direction between gaps at road joints,
Some pavements are constructed of an asphalt mixed base layer with reinforcing wire mesh embedded in the gangplank and an asphalt mixed surface layer. This conventional example attempts to absorb the expansion and contraction of the bridge by utilizing the asphalt mixed base layer sliding on the deck slab together with the gangplank.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned conventional example, although the asphalt mixed base layer improves its load-bearing strength with the wire mesh, the expansion and contraction function is lower than that of the asphalt mixed surface layer, which inhibits the expansion and contraction of the bridge. This could be a factor.

In other words, an object of the present invention is to improve the elasticity of the lower layer of pavement to prevent cracking of the pavement, to facilitate construction, and to prevent the pavement from popping out due to swelling or peeling. The goal is to

(Means for Solving the Problems) In order to solve these problems, the present invention provides a block layer in which a plurality of blocks are laid through a filling layer on a cover member that covers a gap in a road joint, and Paving is applied on top of the block layer so that the expansion and contraction of the road bridge can be absorbed by the filling layer and the block layer without causing cracks in the pavement.

Further, the present invention prevents the paving material from peeling off and popping out when the pavement shifts on the block layer and causes heaps or cracks.

Specifically, a step portion lower than the road surface height is formed at the opposite end of the road with a gap between the road joints, and a lid member covering the gap is installed between the two step portions. Then, a filling layer of sand or the like is provided on the lid member, a large number of blocks are laid on top of this filling layer to form a block layer, and paving is applied on top of this block layer.

Then, the total length of the blocks in the bridge length direction of the block layer is set smaller than the length of the packed layer in the bridge length direction at the time when the gap is the narrowest. An upwardly projecting connecting means is provided for connecting the pavement and the blocks.

(Function) At such road joints, the block layer allows the expansion and contraction of the road bridge because the individual blocks can move in accordance with the expansion and contraction of the road bridge, and the filling layer also allows the expansion and contraction of the road bridge because its filling material can move. Allow the bridge to expand and contract. In this case, the block layer is set so that the total length of the blocks in the bridge length direction is smaller than the length of the filling layer in the bridge length direction at the time when the gap is the narrowest. This allows the bridge to expand and contract.

Therefore, the pavement at the joint is affected by the expansion and contraction of the road bridge through the elastic filler layer and block layer, and the filler layer and block layer act as a buffer, so that Cracks are suppressed.

Furthermore, since the block layer is provided with upwardly protruding coupling means for coupling the pavement and the blocks, it is possible to prevent the pavement from shifting or peeling off.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

-Example 1- At joint 1 of the road shown in Fig. 1,
2, 2 is a road facing each other with a play area 3, and a floor slab 4
A slab upper surface pavement 5 is applied to the upper surface of the road, and step portions 6, 6 lower than the road surface height are formed at the ends of the roads 2, 2.

A lid member 7 covering the play space 3 is installed on the stepped portions 6, 6, and a filling layer 8 is placed over the entire area between the stepped portions 6, 6 to cover the lid member 7. A large number of blocks 9, 9, . . . are laid down to form a block layer 10, and this block layer 1
0, a joint paving 11 is applied.

In this example, the lid member 7 is formed into a plate shape from a rubber material, and the center portion of the lid member 7 is bent in a U-shape in the play space 3, and both ends of the lid member 7 are planted in the floor slab 4. The anchor bolt 12 is fixed to the stepped portion 6 by applying a nut. The filling layer 8 is formed of a filling material such as sand or bituminous material, and is thick enough to cover the upper end of the anchor bolt 12, that is, to prevent interference between the block 9 and the anchor bolt 12 (for example, about 30 mm).
is being done.

The block 9 is made of cement concrete, asphalt concrete, stone, resin material, resin mortar, resin concrete, rubber, or the like.
The block 9 of this example is formed into a rectangular shape as shown in FIG. 3, and the length of one side of the block 9 is about 70 mm. The length of this side can be changed as appropriate within the range of about 50 to 250 mm. The height of the block 9 is approximately the same as the pavement thickness of the upper surface of the deck (50 to 80 mm), and this height can also be determined as necessary within the range of approximately 10 to 200 mm.

In the block layer 10, every other block 9 in the road width direction and the longitudinal direction is provided with coupling means 14 projecting upward. The connecting means 14 in this example is constituted by a connecting bar whose upper part is bent into a hook shape, and connects the joint pavement 11 and the block 9. This coupling means 14
For example, a straight bar-shaped reinforcing bar, a reinforcing bar whose upper part is bent into an L-shape, a reinforcing bar whose upper part (head) has a large diameter, or a bolt with a head can be used. Also,
In this embodiment, the upper surface of each block 9 is lower than the upper surface of the floor slab, so that the upper end of the coupling means 14 does not protrude above the upper surface of the floor slab. In other words, the joint pavement 11 is formed thicker than the slab upper surface pavement 5.

Therefore, the area occupied by all the blocks 9 on the upper surface of the packed bed 8 is set smaller than the filling area of the packed bed 8, and as shown in FIG.
A slight gap S is created between them. Specifically, in the case of the above embodiment, the length L of the stepped portion 6 in the bridge length direction is set to 500 mm, the clearance 3 is set to 100 mm assuming a standard clearance time, and the length L of the filled layer 8 in the bridge length direction is set to 500 mm. The length L is 1100mm. Furthermore, 15 blocks 9 with a side length of 70 mm are laid between the length L (the direct connection length of all blocks is 1050 mm), and the gap S between each block 9 is 3.5 mm on average.
mm (total gap amount 50mm).

In this case, in order for the block layer 10 to allow expansion and contraction of the road bridge, the total length of the blocks in the bridge length direction must be equal to the length of the filling layer 8 in the bridge length direction at the minimum clearance when the clearance 3 is at its narrowest. It is only necessary to set it so that it is smaller than that.

The gap S is provided with the same width between each block 9 in the road width direction, and therefore,
The occupancy rate of block 9 expressed by the following equation is about 91%.

Occupancy rate = (occupied area / filling area) × 100 In other words, at an occupancy rate of about 91%, the length in the bridge length direction L =
In the case of 1100mm, the total clearance amount is 50mm, and the allowable expansion/contraction amount of the road bridge is ±50mm. In addition, L is maximum 2000
It is about mm.

The gap S between each block 9 is at standard idle time (temperature 20
℃) is set in the range of 2 to 5 mm, and this gap S is filled with a joint material such as sand, pitch, paving material, rubber, etc.
3 is filled.

At joint 1 of the above road, floor slabs 4 and 4
The expansion and contraction of the sand layer 8 and the block layer 10 are allowed in the dimensional change in the bridge length direction, and this block layer 1
As each block 9 moves at 0, tensile or compressive stress is generated in the joint pavement 11.
In this case, the joint pavement 11 is affected by the expansion and contraction of the deck slabs 4, 4 through the filling layer 8 and the block layer 10.
Since this provides a buffering effect, cracks in the joint pavement 11 are less likely to occur. Even if a crack occurs, it will remain a minute crack.

Then, the connecting means 14 connects the joint pavement 11
is connected to the block 9 to prevent the joint pavement 11 from bulging due to displacement movement or from peeling off from the block 9 or popping out onto the road in the event of cracking.
Ensure running stability and safety. In addition,
As shown by the chain line a in FIG. 1, the side surface of the stepped portion may be sloped to widen upward, and the paving material may be placed in the sloped and cut-out portion.

-Example 2- This example is shown in FIGS. 4 and 5.

That is, in the joint 15 of this example,
The lid member 16 covering the play area 3 is formed into a plate shape from a highly rigid material such as iron, resin, or concrete, and one end is fixed to the step part 6 with an anchor bolt 12, and the other end has a long plate in the bridge length direction. A long hole 17 is formed,
Anchor bolts 12 are inserted into the elongated holes 17, and are movable relative to the floor slab 4 through the elongated holes 12. In this example, a long hole is provided, but the lid member may simply have one end fixed to the step and the other end placed on the step.

Further, the block layer 18 on the filling layer 8 is a fifth layer.
As shown in the plan view, it is constructed by providing a large number of rectangular parallelepiped blocks 19 in a staggered manner (staggered) in the bridge length direction. And each block 19
The gap S is provided wider toward the play space 3. Further, the connecting means 20 for connecting the blocks 19 and the joint pavement 11 is a cylindrical body, which is embedded in each block 19 and has an upper portion protruding into the joint pavement 11.

In this example, the paving material of the joint pavement 11 enters the cylinder of the coupling means 20, increasing the bonding force between the joint pavement 11 and the blocks 19.

Next, other examples of blocks will be explained based on FIGS. 6 to 12. Note that the blocks in each of these examples use the same coupling means 14 as in the first embodiment.

The block 21 shown in FIG. 6 has a regular hexagonal planar shape, and the block 22 shown in FIG. 7 has a rectangular planar shape with engaging waves 23 provided on the circumferential surface. The block 24 shown in FIG. 8 has a protrusion 25 projecting at an angle of 120 degrees. The block 26 shown in FIG. 9 includes an engaging protrusion 27 and an engaging recess 28 that engages with the engaging protrusion 27, and this engagement brings the blocks 26 into a connected state.

FIG. 10 shows a block 29 with an inverted convex cross section.
and a block 30 whose upper and lower parts protrude in opposite directions are shown in combination,
In the case of such blocks 29, 30, since the wheel load is distributed from one block to the other,
Block collapse due to wheel load does not occur. Also,
In this example, the gap S between each block becomes wider as it moves away from the clearance.

In addition, the block 31 shown in FIGS. 11 and 12 has a groove 32 formed on the upper surface, and the grooves 32, 32, . . . of a plurality of blocks 31, 31, . . . Slip bars 33, 34 made of rigid flat plates, etc. are inserted into grooves 32, 32.
. . . and each block 31 is arranged in series. The slip bars 33 and 34 are embedded in a filler 35 filled in the groove 32. The connection method using such a slip bar is as described in block 9 in the previous embodiment.
It can also be applied to Nos. 19, 21, 22, 24, 26, 29, and 30.

In each of the above embodiments, the coupling means is provided only in a specific block of the block layer, but the coupling means may be provided in all blocks. Further, the size of the gap between each block can be set in consideration of the sliding resistance between the block and the filling layer.

(Effects of the Invention) According to the present invention, since the filling layer and the block layer exhibit a buffering effect that reduces the influence of expansion and contraction of the deck slab on the joint pavement, cracking of the joint pavement is prevented and it lasts for a long time. It is possible to maintain good vehicle running performance across the bridge, and since it is a continuous pavement, it prevents the generation of shocks, running noises, and low frequencies when the vehicle is running, and eliminates the effects of rutting. By increasing the length in the longitudinal direction, the above-mentioned buffering effect can be enhanced, and expansion and contraction can be tolerated even in long-span road bridges that have a large amount of expansion and contraction. It prevents movement and peeling, ensuring the running stability of the vehicle, and the expansion and contraction device is inexpensive and easy to install.
The excellent effect of easy maintenance can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view taken in the bridge length direction showing a road joint in Embodiment 1, and FIG. 2 is an enlarged sectional view of a part of FIG. 1. Fig. 3 is a plan view showing the same device before paving, Fig. 4 is a sectional view taken in the bridge length direction showing the road joint of Example 2, and Fig. 5 shows the joint of Example 2 paved. 6 to 9 are plan views showing other examples of the block, FIG. 10 is a sectional view taken in the bridge length direction showing another example of the block, and FIG. 11 is a slip bar. FIG. 12 is a plan view showing blocks of the serial arrangement type, and a sectional view thereof. 1, 15...Road joint, 2...Road,
3...Playroom, 4...Floor slab, 6...Dan section, 7,16
...Lid member, 8...Filled layer, 9, 19, 21, 2
2, 24, 26, 29, 30, 31...block, 10, 18...block layer, 11...joint pavement, 14, 20...coupling means.

Claims (1)

[Claims] 1. A step lower than the road surface height is formed at each of the opposing road edges with a gap in the road joint, and a lid member covering the gap is installed between both steps, and a lid member is installed on top of the lid member. A filling layer of sand, etc. is provided, and a large number of blocks are laid on top of this filling layer to form a block layer. Paving is applied on top of this block layer, and this block layer is a layer that separates the pavement and blocks. A coupling means protrudes upward for coupling, and the total length of the blocks in the bridge length direction of the block layer is set to be smaller than the length of the filled layer in the bridge length direction at the minimum gap when the gap is the narrowest. A road joint characterized by: