JPH0151605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a road joint, which 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, for example, as described in Japanese Patent Application Laid-open No. 58-58307, a movable gangplank is installed in the bridge length direction between gaps in the deck of a road bridge. A leveling layer made of an asphalt mixture is provided on the deck slabs on both sides, and a pavement consisting of an asphalt mixture base layer and an asphalt mixture surface layer in which reinforcing wire mesh is embedded from above the spanboard to the leveling layer is provided. be. This conventional example attempts to permit 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, and the expansion and contraction of the bridge is not allowed. It will be a disadvantage in that respect.

(Means for Solving the Problems) The present invention solves these problems by providing a block layer in which a plurality of blocks are laid through a leveling layer on a lid member that covers the gap at the road joint,
To provide an easy-to-construct road joint in which pavement is applied on top of this block layer so that expansion and contraction of a road bridge can be absorbed by the leveling layer and the block layer without causing large cracks in the pavement. It is.

In other words, the specific means for this purpose is to form a step lower than the road surface height at the opposite end of the road with a gap at the road joint, and a cover member covering the gap is provided on both steps. The lid member is constructed to allow expansion and contraction in the longitudinal direction, and a leveling layer filled with a leveling material such as sand or bituminous material is provided on the lid member, and a plurality of blocks are placed vertically and horizontally on this leveling layer. It is laid to form a block layer, and paving is applied on top of this block layer.
than the length of the leveling layer in the road longitudinal direction,
This road joint is characterized in that the sum of the lengths in the longitudinal direction of the road of each block of the block layer existing in the range of the leveling layer in the longitudinal direction of the road is set short.

(Function) In the case of the above road joint, the sum of the lengths in the road longitudinal direction of each block of the block layer existing in the range of this leveling layer in the road longitudinal direction is set to be shorter than the length of the leveling layer in the road longitudinal direction. Because of this, this block layer can both contract in the longitudinal direction of the road and extend in the same direction. In other words, this block layer allows the road to expand and contract by allowing each block to move in the same direction in response to the longitudinal expansion and contraction of the road. The pavement at the joint will be affected by the expansion and contraction of the road through the block layer, but
At this time, this block layer exhibits a buffering effect that reduces the influence of expansion and contraction of the road transmitted to the pavement due to the movement of each block.

(Effects of the Invention) Therefore, according to the present invention, the block layer exhibits a buffering effect that reduces the influence of expansion and contraction of the road on the pavement at the joint, so cracks in the pavement at the joint are suppressed and the pavement lasts for a long period of time. By increasing the length of the leveling layer and blocking layer in the longitudinal direction of the road, it is possible to maintain good vehicle running performance over a long period of time, and by increasing the length of the leveling layer and the blocking layer in the longitudinal direction of the road, the above-mentioned buffering effect can be enhanced and the expansion and contraction can be tolerated even in a long bridge that has a large amount of expansion and contraction. In addition, the joint itself does not require the use of expensive steel materials and is therefore inexpensive, as well as easier to construct and maintain than when steel materials are used.

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

Example 1 This example is illustrated in FIGS. 1-3.

At joint 1 of the road shown in Figure 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 so as to allow expansion and contraction in the longitudinal direction of the roads 2, 2, and a leveling layer 8 covers the lid member 7 and covers both the stepped portions 6. , 6, and on top of this leveling layer 8, a plurality of blocks 9, 9,
... are laid vertically and horizontally to form a block layer 10, and a joint paving 11 is applied on top of this block layer 10.

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. In other words, the lid member 7 is adapted to allow the road to expand and contract due to the U-shaped flexure.

The leveling layer 8 is made of a leveling material such as sand or bituminous material, and has a thickness that covers the upper end of the anchor bolt 12, that is, a thickness that does not interfere with 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, steel, 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 is 50~
It can be changed as appropriate within a range of about 250mm. Block 9
The height is approximately the same as the pavement thickness (50 to 80 mm), and this height can be changed as necessary within the range of approximately 50 to 200 mm.

Therefore, all of block 9 is leveling layer 8
The area occupied on the upper surface of the block is set to be smaller than the area of the leveling layer 8, and as shown in FIG. 2, a slight gap S is created between each block 9. Specifically, in the case of the above embodiment, the length L ₁ of the stepped portion 6 in the road longitudinal direction (bridge length direction) is 500
mm, and play time 3 is 100 assuming standard play time.
Therefore, the length L of the leveling layer 8 in the longitudinal direction of the road is 1100 mm. In the block layer 10, 15 blocks 9 each having a side length of 70 mm are laid between the length L, and each block of the block layer 10 existing in the range of the leveling layer 8 in the longitudinal direction of the road. The total length of blocks 9 in the longitudinal direction of the road is 1050 mm, which is 50 mm shorter than the length L of the leveling layer 8, and the distance S between each block 9 is about 3.5 mm on average.

The above-mentioned space S is provided with the same width between each block 9 in the road width direction, and therefore,
It is expressed by the following equation, and the occupancy rate of block 9 is approximately 91%.

Occupancy rate = Occupied area / Leveling layer area (×100) In other words, when the occupancy rate is about 91% and the length L in the longitudinal direction of the road is 1100 mm, the total distance is 50 mm, and the allowable expansion and contraction of the road bridge is ± It is 50mm. Note that L is approximately 2000 mm at maximum.

The interval S of each block 9 is the standard idle time (temperature 20
℃) is set in the range of 2 to 5 mm, and this 〓
Sand, pitch, paving material, rubber, etc. joint material 1 is used between S.
3 is filled.

At joint 1 of the above road, floor slabs 4 and 4
This expansion and contraction is allowed by the dimensional changes in the road longitudinal direction of the leveling layer 8 and the block layer 10, and as each block 9 in this block layer 10 shifts, tensile stress or compressive stress is generated in the joint pavement 11. . In this case, the joint pavement 11 is connected to the floor slab 4 through the leveling layer 8 and the block layer 10.
Since the leveling layer 8 and the block layer 10 exhibit a buffering effect, cracks are less likely to occur in the joint pavement 11. Even if a crack occurs, it will remain a minute crack.

Incidentally, when the leveling layer 8 is made of sand, each particle of sand flows,
The above-mentioned floor slabs 4, 4 are allowed to expand and contract, and when made of bituminous material, the expansion of the floor slabs 4, 4 is allowed by being compressed, and the contraction of the floor slabs 4, 4 is allowed. This can be tolerated by elongation or cracking.

Example 2 This example is shown in FIG. 4, and is different from Example 1 in the structure of the lid member 15. The rest is the same as in Example 1.

That is, the lid member 15 of this example is formed into a plate shape from a rigid material such as iron, resin, concrete, etc., and one end is fixed to the stepped portion 6 with an anchor bolt 12, and the other end is provided with a long hole in the longitudinal direction of the road. 16 is formed, and the anchor bolt 12 is inserted into this elongated hole 16. This allows the other end of the cover member 15 to move relative to the floor slab 4, and expands and contracts the road bridge. It is allowed.

Next, other embodiments of the block are shown in FIGS. 5 to 9.
This will be explained based on the diagram.

The block 21 shown in FIG. 5 has a regular hexagonal planar shape, and the block 22 shown in FIG. 6 has a rectangular planar shape with engaging waves 23 provided on the circumferential surface. The block 24 shown in FIG. 7 has protrusions 25 that protrude in three directions at an angle of 120 degrees. The block 26 shown in FIG.
and an engagement recess 28 that engages with this,
This engagement brings each block 26 into a connected state.

FIG. 9 shows a block 29 with an inverted convex cross section,
It is shown in combination with a block 30 whose upper and lower parts protrude in opposite directions, and in the case of such blocks 29 and 30, the wheel load is distributed from one block to the other, so that the wheel load Block depression does not occur.

In addition, block 3 shown in FIGS. 10 and 11
1 has a concave groove 32 formed on the upper surface, and the concave grooves 32, 32, . . . of the plurality of blocks 31, 31, .
... are arranged in series, and slip bars 33, 34 made of reinforcing bars, elongated rigid flat plates, etc. are connected to grooves 32, 3.
2, . . . 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. This connection method using slip bars can also be applied to blocks 9, 21, 22, 24, 26, 29, and 30 listed in the previous embodiments.

[Brief explanation of drawings]

The drawings show embodiments of the invention, FIG. 1 Embodiment 1
Figure 2 is a cross-sectional view showing an enlarged part of Figure 1, and Figure 3 is a plan view of the same joint before paving. , FIG. 4 is a sectional view taken in the longitudinal direction of the road showing the joint of the road in Example 2, FIGS. 5 to 8 are plan views showing other examples of the block, and FIG. FIG. 10 is a plan view showing a block of the slip bar continuous system, and FIG. 11 is a cross-sectional view of the same. 1...road joint, 2...road, 3...
Play space, 4... Floor slab, 6... Step section, 7, 15... Lid member, 8... Leveling layer, 9, 21, 22, 2
4, 26, 29, 30, 31...Block, 10
...Block layer, 11...Joint paving.

Claims (1)

[Claims] 1. A stepped portion lower than the road surface height is formed at the opposite end of the road with a gap between the road joints,
A lid member covering the play space is installed on both steps to allow expansion and contraction in the longitudinal direction of the road, and a leveling layer filled with a leveling material such as sand or bituminous material is provided on the lid member, On top of this leveling layer, multiple blocks are laid vertically and horizontally to form a block layer, and paving is applied on top of this block layer.
than the length of the leveling layer in the road longitudinal direction,
A road joint characterized in that the sum of lengths in the longitudinal direction of the road of each block of the block layer existing in the range of the leveling layer in the longitudinal direction of the road is set to be short.