JPH0726364B2 - Continuous concrete pavement - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jointless continuous concrete pavement used for roads and runways.

[0002]

2. Description of the Related Art Conventionally, continuous concrete pavement without joints has longitudinal and horizontal reinforcing bars arranged in the lengthwise and widthwise directions of the pavement, and the amount of reinforcing bars is about 0.7% of the area in the lengthwise direction. ,
The width is set to about 0.08% and the width is adjusted to about 1.5 m so that cracks in the width direction are induced, which enables jointless construction.

On the other hand, in the prestressed concrete pavement, a PC steel material is inserted in the length direction and the width direction of the concrete pavement plate, and the PC steel material is tensioned to apply prestress to enhance the toughness of the concrete pavement plate and generate cracks. Is preventing.

[0004]

In the above-mentioned conventional continuous pavement concrete pavement, cracks are induced in the width direction at intervals of about 1.5 m by setting the amount of reinforcing bars to a predetermined ratio with respect to the pavement cross-sectional area. However, the spacing between the cracks in the width direction is not always the expected spacing, and cracks in the length direction occur at right angles to the cracks in the width direction, causing the pavement plate to be partially destroyed. There is a problem of reaching.

On the other hand, in prestressed concrete pavement, it is possible to reduce the cracks that occur in the pavement plate as much as possible, but a jack space for PC steel material tension is required, and the pavement plate extension is usually about 100 m apart. Each time, a stretch joint was required in the width direction, and there was a problem in the continuity of the paving slab.

In view of such conventional problems, the present invention provides a continuous concrete pavement in which cracks in the width direction are accurately induced at predetermined intervals and cracks in the length direction are prevented, and long continuous pavement is possible. It is intended for.

[0007]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
In a continuous concrete pavement in which continuous reinforcing bars are arranged in the length direction of the concrete pavement plate to construct a continuous concrete pavement plate without joints, a PC steel material also used for inducing cracks in the width direction of the concrete pavement plate. In a continuous concrete pavement in which insertion sheaths are embedded at regular intervals and PC steel is inserted into the sheaths to apply prestress in the width direction of the concrete pavement plate, and in the continuous pavement, This is because a crack-inducing material made of a plate was provided along the length direction.

[0008]

In this continuous concrete pavement, prestress is not applied in the length direction of the concrete paving slab, but prestress is applied by inserting the PC steel material in the width direction.
Cracks occur in the direction (width direction) orthogonal to the length direction, but cracks are less likely to occur in the length direction.

Moreover, since the sheath for inserting the PC steel material is embedded in the width direction, a cross-section defect occurs, and a crack in the width direction is apt to occur in the sheath embedded portion. Therefore, by embedding the space between the sheaths at a space where cracks are desired to be induced, the cracks in the width direction can be concentrated at a desired position, and a continuous concrete pavement that is hard to break and has no joints can be obtained.

Further, by adding a plate-shaped crack inducing plate to the sheath, cracks in the width direction can be generated more accurately.

[0011]

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

In the figure, 1 is a pavement plate made of cast-in-place concrete. The paving slab 1 is constructed continuously in the length direction without providing joints in the width direction.

In the paving slab 1, continuous reinforcing bars 2, 2,
2 ... are buried, and lateral streaks 3, 3 ... are also buried in the width direction as needed. Further, sheaths 4, 4 ... for inserting PC steel materials are embedded in the width direction of the paving slab 1. The PC steel materials 5 are inserted into the sheaths 4, and the ends of each PC steel material 5 are paved. 1 is supported by both side surfaces of the pavement 1 and is tense, and the end portion is fixed by the fixing tool 6 to apply prestress in the width direction of the pavement plate 1.

On the other hand, as shown in FIG. 3, the sheath 4 is provided with a crack inducing plate 7 made of a strip plate standing on the upper surface thereof along a lengthwise direction with a tightening ring 8.

Further, as an example, as shown in FIG. 2, when the thickness H of the paving slab 1 is 300 m / m, the diameter D
The crack inducing plate 7 having a height of about 10 m / m is fixed to the center of the pavement plate thickness of the sheath 4 having a thickness of 35 to 40 m / m. The pitch a between the sheaths 4 and 4 is determined as needed. The crack inducing plate 7 is not always necessary when the ratio of the sheath diameter to the thickness of the pavement plate 1 is large, and is not necessarily required to be installed in all the sheaths 4.

[0016]

EFFECTS OF THE INVENTION In the continuous concrete pavement constructed as described above, since prestress is applied in the width direction of the pavement plate, the generation of cracks in the lengthwise direction of the pavement plate is suppressed,
In addition, since the sheath for prestressing is embedded in the width direction at regular intervals, the pavement cross-section defect occurs in that portion, and the structure causes cracks in the width direction, which causes cracks only in the width direction. A continuous concrete pavement in which cracks in the length direction are suppressed can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a bar arrangement state of pavement according to the present invention.

FIG. 2 is a partially enlarged sectional view of the above.

FIG. 3 is a perspective view of a sheath provided with a crack inducing plate used in the present invention.

[Explanation of symbols]

 1 Concrete Pavement Plate 2 Continuous Reinforcing Bar 3 Horizontal Bar 4 Sheath for Inserting PC Steel Material 5 PC Steel Material 6 Fixing Tool 7 Crack Inducing Plate 8 Tightening Ring

Claims (2)

[Claims] 1. A continuous concrete pavement in which continuous reinforcing bars are arranged in the lengthwise direction of the concrete pavement plate to construct a continuous concrete pavement plate without joints, and cracks are formed in the widthwise direction of the concrete pavement plate. A continuous concrete pavement in which PC steel material insertion sheaths that also serve as inducers are embedded at regular intervals, and PC steel material is inserted into the sheaths to apply prestress in the width direction of the concrete paving slab. 2. The continuous concrete pavement according to claim 1, wherein the sheath is provided with a strip-like crack inducing plate along the length direction thereof.