Construction technology of highway guardrail
1. Preparation before installation of guardrail board. First, the project department must be established. The project department is the technical and management core of the entire project. The establishment of a sound construction system and personnel management system is a necessary condition for safe and civilized construction. Secondly, it is necessary to review the construction documents and determine the construction plan and schedule, especially the requirements and safety awareness training for construction personnel, clearly grasp the weather conditions and geological conditions in the construction area, make long-term arrangements, and assign responsibilities to individuals . Finally, test piles for the construction structure will be drilled, and construction can only be carried out after passing the inspection by the geological supervision engineering technicians.
2. Material inspection. The inspection of materials shall be carried out sampling inspection according to relevant regulations, and the main content shall include whether the size, specifications and craftsmanship of the materials are consistent with the markings on the construction drawings.
3. Pay off. First of all, find the precise reference point, and ensure that the position of each reference point is accurate, especially when the slope is large and the curve phase should be added to the reference point, and the phenomenon of no reference point in the dead corner is prohibited. In the process of setting the reference point, it is necessary to carefully check the exact position of the layout point, and make a record and mark to facilitate the completion acceptance. For sections that do not conform to the construction drawings during construction, the construction plan and construction measures should be adjusted according to the site conditions. For the modified construction plan, construction can only be carried out after review by the supervision unit.
4. Piling. Piling is the most critical step in the installation of highway guardrails. The spacing, verticality and accuracy of each pile must be ensured. This can not only compensate for the deviation of the position when laying out the line, but also increase the overall stability and stability of the guardrail after the completion of the construction. The degree of aesthetics. Existing piling technologies mainly include guide rod diesel piling and hydraulic piling. However, due to the high mobility of guide rod diesel piling, it is not easy to control, and road damage and slope looseness often occur during the construction process, so Hydraulic pile drivers have been replaced and widely used. Hydraulic piling is not only slow in piling speed, but also mobile and sensitive. It makes full use of impact force to buffer and minimize the impact on surrounding structures. Since the hammer head does not leave the pile during pile driving, the re-adjustment of the pile is avoided when the transfer is made, and the construction progress is greatly accelerated.
