Heating repair technology of asphalt pavement cracks and development of joint filling machine
With the continuous development of high-grade highway construction and the increase of highway mileage, various diseases of highway are becoming more and more serious, among which pavement crack is one of the most common diseases of early damage of asphalt pavement. If these cracks and cracks are not treated in time, the cracks and cracks will be caused. The infiltration of water from the cracks will even soften the surface layer and subgrade, resulting in the decline of pavement bearing capacity and acceleration of pavement damage. How to effectively repair the pavement cracks has aroused the attention of highway management and maintenance departments.
Filling materials into cracks is the most common method to deal with cracks in asphalt pavement. At present, cracks are usually poured at normal temperature. Due to the high temperature of filling material "greater than or equal to! And the pavement temperature is lower
", the large temperature difference makes the pouring depth of this process shallow, resulting in shorter service life of cracks after grouting. If the heating process of pavement cracks is added in the construction process, and the joint filling process is carried out at the same time, the pouring material
(asphalt or other joint filling materials) can be combined with the poured object (pavement cracks) at a higher temperature, which will greatly improve the maintenance and service life of the cracks after repair. Specific construction process
Before the crack pouring, the on-the-spot investigation is carried out on the pavement crack, the converted area and depth of the crack are calculated, and the sufficient grouting materials (asphalt or other grouting materials) are prepared. Check the construction equipment (joint expander and joint grouting machine) to ensure their normal operation
Due to the irregular width of pavement cracks, it is necessary to widen the cracks by using a joint expander for the small irregular cracks with the width less than or equal to or less than. Generally, the joint will be extended to the construction joint with a depth of about)
. It is better to select the expansion equipment without cooling expansion saw blade, so as to prevent the spraying cooling water from entering the joint and affecting the construction progress and quality.
To clean and blow the debris in the newly expanded crack or the original wide crack, so that the crack filling material can be easily poured in.