According to the situation of on-site investigation, this design adopts corrugated beam guardrail for safety protection in road sections such as roadside fill height is larger and waterfront, pond road section and curve half-diameter is smaller, continuous sharp bend, curve outside, existing warning pier or warning pile and roadside danger and other road sections are adopted, prevent vehicles from rushing out of the road surface, guarantee vehicle driving safety.
The corrugated guardrail adopts hot-dip galvanizing + plastic spraying treatment, the average galvanized layer adhesion of columns and beams is 275g m2, the average galvanized layer thickness is 39um, and the minimum thickness of spray coating is 76umThe average amount of galvanized layer adhesion of other fasteners and connectors is 120g m2, and the average thickness of galvanized layer is 17umThe minimum thickness of the spray coating is 76um.
The design of the corrugated beam guardrail is designed according to the protection level C, and the structure types are as follows:
1) GR-C-2E corrugated guardrail is suitable for small radius sections of roadside earthwork with a height of more than 3 meters of highway embankment, and the outer protection thickness of the column should not be less than 25 cm. The compaction of the dirt shoulder outside the carriageway should meet the requirements of the code (>90%), and when the shoulder is consistent with the height of the road surface, the column is directly driven by a pile driverIf the shoulder is lower than the road surface or the degree of compaction does not meet the requirements of the code (>90%), the shoulder should be reinforced with concrete with a reinforcement size of 05×0.5×0.5m, the design elevation of the top surface of the reinforced concrete is the same as the elevation of the edge of the original pavement. The reinforced concrete is buried in the soil shoulder not less than 10 cm, and the height difference h between the soil shoulder and the edge of the pavement is determined according to the field conditions to ensure the support strength of the outside of the columnWhen H 400mm, it is processed as indicated. If H 400mm, the shoulder wall should be set to meet the guardrail setting conditions.
2) GR-C-4E corrugated guardrail is suitable for normal roadside earthwork sections with a highway embankment height greater than 3 meters, and the outer protection thickness of the column should not be less than 25 cm. The compaction of the dirt shoulder outside the carriageway should meet the requirements of the code (>90%), and when the shoulder is consistent with the height of the road surface, the column is directly driven by a pile driverIf the shoulder is lower than the road surface or the degree of compaction does not meet the requirements of the code (>90%), the shoulder should be reinforced with concrete with a reinforcement size of 05×0.5×0.5m, the design elevation of the top surface of the reinforced concrete is the same as the elevation of the edge of the original pavement. The reinforced concrete is buried in the soil shoulder not less than 10 cm, and the height difference h between the soil shoulder and the edge of the pavement is determined according to the field conditions to ensure the support strength of the outside of the columnWhen H 400mm, it is processed as indicated. If H 400mm, the shoulder wall should be set to meet the guardrail setting conditions.
3) GR-C-2C type corrugated guardrail is suitable for slurry retaining wall type, adopt the roadside earthwork small radius road section that can not be constructed by the driving method, when the curb width is less than 50 centimeters, the longitudinal width of the foundation should be extended to the road surface, ensure the longitudinal width of 50 centimeters.
4) GR-C-4C corrugated guardrail is suitable for the normal road section of the roadside earthwork that can not be constructed by the mortar retaining wall type, and the width of the curb belt is less than 50 cm, and the longitudinal width of the foundation should be extended to the road surface to ensure the longitudinal width of 50 cm.
5) GR-C-2B1 corrugated guardrail is suitable for the road side is cement concrete shoulder wall or overall hard rock, can not use the driving method and is difficult to do the foundation, and the embankment height is greater than 3 meters or there is a concrete retaining wall of the road section, the use of bored construction, corresponding to the specification GR-C-2B1 type. If the geological conditions are inconsistent with the design during construction, they can be adjusted according to the actual situation.