highway guardrail length

highway guardrail length

highway guardrail length should be in accordance with the requirements. The steel plate or strip should be formed by cold bending and completed by one punch. In the lap part of the waved beam, the equal section can be used, and the cross section can be used.

highway guardrail length should be consistent with the shape steel. Note: when the occupancy rate of heavy vehicles is high, the dangerous road of serious traffic accidents will happen when the vehicle gets out of control, and a circular column with a diameter of 140 * 4.5 can be used. The structure of movable guardrail at the opening of the central divider. The height of the movable guardrail should be consistent with the setting height of the wave beam guardrail in the central divider.

All kinds of materials for wave beam guardrail on roadside and central dividers should meet the following requirements.

The steel of the guardrail, column, cross beam, end beam and connecting bolt are common carbon structural steel (Q235). The technical conditions should be in accordance with the specification of carbon structural steel (GB700 - 88).

High strength bolts should be adopted for the bolts of the splicing board, and the material can be used 20MnTiB. The technical conditions should be in accordance with the provisions of the joint (GB3632 ~ 3633 - 83) of the high strength bolt for steel structures.

The material of block material can be made of section steel, and its technical conditions should conform to the requirements of cold bending section steel technical conditions (GB6725 - 86).

When the column is buried in the concrete, the number of concrete should not be less than No. 15. The material used for concrete should conform to the regulations of the construction technology of highway bridge and culvert (JTJ041 - 89).

All the cold bending steel parts of all waved beam guardrails should be treated as anticorrosion treatment and can be hot-dip galvanized. Zinc used in hot dip galvanizing should be zinc or zinc No. 0 specified in "zinc ingot" (GB470 83). The amount of zinc crossing of a wave beam guard should be the zine crossing of wave beam, end beam, cross beam, column and steel resistance block. The amount is 600 (g/m2). Bolts, nuts, washers and anchorages shall be 3050 (g/m2).

a highway guardrail is designed

Bolt, nut and other fasteners must be cleaned or centrifuged after hot dip galvanizing. When conditions permit, the fasteners and other fasteners such as bolt and nut can also be made of powder galvanizing.

The corrosion protection principle of movable guardrail is the same as that of corrugated beam guardrail. When hot dip galvanizing is applied, the amount of zinc plating shall be 600g/m2.

highway guardrail length

The structure should be consistent with the road side wave beam guardrail, and should be arranged according to the line and terrain of the triangle zone. The shortest length of its setting is to adopt the strengthening type (S grade) in the range of two ends 8m of the main side of the main line of the freeway and the 8m range on the side of the ramp.

In the middle of the strong guardrail, 6 span a class barrier and the round head are used. Connect the guardrails on both sides of the triangle. We should set up the bumper pad in the dangerous triangle area. The center height of the beam in the wave beam guardrail is 60cm. from the road to the center of the bolt hole. When there is a road stone, the center height of the beam is calculated from the top of the road edge to the center of the bolt hole is 60cm.. When the wave beam guardrail has a resistance block, the center height of the beam is unchanged.

The depth of the column should not be less than 110cm when the column of the guardrail is buried and no road edge stone, the depth of the column should not be less than 125cm. The depth of the column should not be less than 125cm when the column of the guardrail is buried and there is a road stone. When the central separator adopts a combined type of highway guardrail and the column is buried in the soil, the depth should not be less than 110cm, when the column of the guardrail is encountered below. In case of circumstances, the concrete foundation embedment method can be adopted:

The columns are placed in bridges, passageways, culverts, etc.

In the bottom of the column, there are underground pipelines, the stone section.

In other special cases, the depth of the column buried in the concrete should not generally be less than 40cm. for the convenience of maintenance and maintenance. The connection mode of the flange assembly can be used. The size of the concrete base and the connection strength of the flange should be determined according to the different circumstances. When conditions are available, the column of the replaceable guardrail should be adopted. The fence, the column, and the protection should be used. The blocks, transverse beams, ends and other components should meet the relevant product standards issued by the Ministry of communications.

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