1. The installation of the column should conform to the design drawing and coordinate with the alignment of the road.

 

2. The pillars should be firmly buried in the soil to reach the design depth and be perpendicular to the road surface.

 

3. Under normal circumstances, the column can be constructed by penetration method. When the penetration depth is too deep, it should be accurately positioned. When the penetration depth is too deep, the part of the column should not be pulled out for correction. After the foundation is compacted, all the pillars must be pulled out and re-penetrated.

 

4. When the penetration method cannot be used, drilling construction technology can be used; if the filling height of the bridge and culvert structure cannot meet the requirements of the column, the concrete foundation consolidation method can be used.
 
5. After the column is installed in place, its horizontal and vertical directions should be smoothly aligned.

 

6. The variable section of the guardrail and the column at the end should be installed according to the coordinates specified in the design.

 

7. Since the pavement is constructed in two stages, the height of the corrugated guardrail shall be set and increased in the order of the first and second stages of the pavement construction according to the reserved holes listed in the design drawings.