The guardrail in the triangle zone of traffic diversion shall be consistent with the guardrail guardrail of the road side, and shall be arranged according to the alignment and landform of the triangle zone. reinforced ( s level ) shall be adopted in the range of 8 m on the main side of expressway and the ramp on the ramp side. in the reinforced guardrail, the indirect 6 span a guardrail, and the guardrail with round head shall be connected. the collision avoidance cushion shall be set in the range of dangerous triangle area.

The height of the beam center of the corrugated beam guardrail is 60 cm from the road surface to the center of the connecting bolt hole.

When there is a curb, the center height of the beam from the top of the curb to 60 cm from the center of the connecting bolt hole. when the wave beam guardrail has block block, its center height does not change.

The pillar of the corrugated beam guardrail is generally embedded in the earth base, and its burial depth shall be as follows:

One, when the fence post is embedded in the soil and without kerb, the embedded depth of the column should not be less than 110 cm

When the fence post is embedded in the soil and there is a curb, the embedded depth of the column should not be less than 125 cm

When the central partition belt adopts the composite type wave type guardrail, the embedded depth of the column shall not be less than 110 cm when the column is embedded in the soil

Second, when the guardrail post meets the following conditions, the concrete foundation embedment method may be adopted:

1. the upright posts shall be placed in places where bridges, corridors, culverts, etc.;

2. under the pillar, there are underground pipelines and stonework section;

3. other exceptional circumstances.

The depth of the column embedded in concrete shall not be less than 40 cm. for the convenience of maintenance and maintenance, the connection type of flange may be adopted. the size of concrete foundation, the connection strength of flange shall be determined by calculation according to different conditions. if conditions, the Draw guardrail shall be adopted.