Construction Preparation
- Technical Preparation: Before construction, a construction plan should be prepared according to the design drawings and other documents, and then reviewed and approved. Surveyors need to accurately determine the positions of the road markings using surveying instruments such as theodolites.
- Mechanical Equipment: Prepare mechanical equipment like electric welding machines, gas cutting sets, and cutting machines, and ensure their normal operation.
- Working Conditions: Relevant technical documents and construction plans should be completed. Construction workers should be in place and have received technical briefings. Raw materials should arrive at the site and pass inspection.
Construction Environment
- The temperature and humidity during construction must meet the requirements of the marking materials. Generally, for hot-melt coating construction, the air temperature should not be lower than 10 °C. Construction must be stopped in bad weather such as rainy days, dusty days, and windy days.
- The construction site should be kept clean to prevent debris, dust, etc. from affecting the quality of the road markings.
Material Requirements
- Road marking materials should comply with relevant standards such as "Pavement Marking Coatings" (JT/T 280 - 2004), having properties such as durability and adaptability.
- Auxiliary materials like primer and glass beads also need to meet corresponding technical conditions. For example, the specifications, quality, and spreading amount of glass beads are strictly regulated.
Construction Process
- Road Surface Treatment: First, use a high-pressure air road sweeper to clean away debris, dust, etc. from the road surface, ensuring that the road surface is dry, flat, and free of loose particles.
- Setting Out: Use an automatic setting-out machine to set out according to the design requirements, determine the positions and dimensions of the road markings, and pass the preliminary inspection and acceptance by the supervision engineer.
- Spraying Primer: Use a high-pressure airless primer spraying machine to spray the primer according to the specified type and dosage. Start the road marking construction only after it is fully dried.
- Marking Construction: Use professional equipment such as self-propelled hot-melt marking machines for coating application, ensuring that the width and thickness of the road markings are uniform, the lines are smooth, the color meets the standard, and there are no phenomena such as dripping, peeling, flaking, or cracking, and that they are coordinated with the road alignment.
- Spreading Glass Beads: Spread glass beads under pressure according to the required amount after the coating is applied, so that they are evenly distributed and firmly attached, ensuring the retroreflective performance of the road markings.
Quality Acceptance
- Position and Dimensions of Markings: They should meet the design specifications, and the deviation from the road centerline and other distances should be within the allowable range.
- Color and Brightness of Markings: The colors should be clear, bright, and in line with the standards, with sufficient brightness, enabling drivers to clearly recognize them under various weather and lighting conditions.
- Marking Quality: The surface of the road markings should be flat, without defects such as bubbles, cracks, or peeling, and the slope should be reasonable with smooth drainage.
- Reflective Performance: The retroreflective coefficient of reflective road markings should meet relevant requirements, and the glass beads should be evenly distributed for uniform reflection.
Construction Preparation
- Technical Preparation: Before construction, a construction plan should be prepared according to the design drawings and other documents, and then reviewed and approved. Surveyors need to accurately determine the positions of the road markings using surveying instruments such as theodolites.
- Mechanical Equipment: Prepare mechanical equipment like electric welding machines, gas cutting sets, and cutting machines, and ensure their normal operation.
- Working Conditions: Relevant technical documents and construction plans should be completed. Construction workers should be in place and have received technical briefings. Raw materials should arrive at the site and pass inspection.
Construction Environment
- The temperature and humidity during construction must meet the requirements of the marking materials. Generally, for hot-melt coating construction, the air temperature should not be lower than 10 °C. Construction must be stopped in bad weather such as rainy days, dusty days, and windy days.
- The construction site should be kept clean to prevent debris, dust, etc. from affecting the quality of the road markings.
Material Requirements
- Road marking materials should comply with relevant standards such as "Pavement Marking Coatings" (JT/T 280 - 2004), having properties such as durability and adaptability.
- Auxiliary materials like primer and glass beads also need to meet corresponding technical conditions. For example, the specifications, quality, and spreading amount of glass beads are strictly regulated.
Construction Process
- Road Surface Treatment: First, use a high-pressure air road sweeper to clean away debris, dust, etc. from the road surface, ensuring that the road surface is dry, flat, and free of loose particles.
- Setting Out: Use an automatic setting-out machine to set out according to the design requirements, determine the positions and dimensions of the road markings, and pass the preliminary inspection and acceptance by the supervision engineer.
- Spraying Primer: Use a high-pressure airless primer spraying machine to spray the primer according to the specified type and dosage. Start the road marking construction only after it is fully dried.
- Marking Construction: Use professional equipment such as self-propelled hot-melt marking machines for coating application, ensuring that the width and thickness of the road markings are uniform, the lines are smooth, the color meets the standard, and there are no phenomena such as dripping, peeling, flaking, or cracking, and that they are coordinated with the road alignment.
- Spreading Glass Beads: Spread glass beads under pressure according to the required amount after the coating is applied, so that they are evenly distributed and firmly attached, ensuring the retroreflective performance of the road markings.
Quality Acceptance
- Position and Dimensions of Markings: They should meet the design specifications, and the deviation from the road centerline and other distances should be within the allowable range.
- Color and Brightness of Markings: The colors should be clear, bright, and in line with the standards, with sufficient brightness, enabling drivers to clearly recognize them under various weather and lighting conditions.
- Marking Quality: The surface of the road markings should be flat, without defects such as bubbles, cracks, or peeling, and the slope should be reasonable with smooth drainage.
- Reflective Performance: The retroreflective coefficient of reflective road markings should meet relevant requirements, and the glass beads should be evenly distributed for uniform reflection.