2016 Corrugated Beam Guardrail Specification

Release time:

2016-11-28


First, the setup of roadside waveform beam guardrail

1, set the roadside waveform beam guardrail, according to the collision avoidance grade can be divided into A and S. S-class guardrail belongs to the strengthened, suitable for the road side of the road side of the particularly dangerous road use. S-class guardrail column centre spacing for 2m.

2, roadside waveform beam guardrail cross section layout, should not make the guardrail surface intrusion within the highway construction limits, and shall not make the guardrail columns on the outside of the lateral earth pressure significantly reduced. The minimum distance from the outer edge of the column to the edge of the shoulder is as follows: when the width of the earth shoulder is 75cm, it should not be less than 25cm; when the width of the earth shoulder is 50cm, it should not be less than 14cm, and when the width of the earth shoulder is 50cm, it should not be less than 14cm.

3, roadside guardrail end of the set: roadside waveform beam guardrail start, finish point should be end processing. The end of roadside guardrail can be designed as ground anchor type or round head type. Against the direction of the upstream round head type end and guardrail standard section should be set between the gradient section, downstream end of the direction of the downstream traffic and standard section of the guardrail into a straight line layout.

4, roadside waveform beam guardrail block is a waveform beam and columns between the bearing parts, applicable to the traffic flow in the more complex vehicle types, worried about the collision vehicles may be in the guardrail columns mixed obstruction of the roadway; or in order to reduce the collision of kerbs on the trajectory of the vehicle movement of the roadway to produce an adverse effect. Guardrail block is divided into A-type, B-type two kinds of A-type is applicable to the round columns, and the guardrail block is divided into A-type and B-type two kinds of guardrail block is applicable to the round columns.

5, road side guardrail should be installed in the solid soil shoulder, when the guardrail column in the case of soft foundation, the guardrail column should be set in the concrete foundation, when possible, it is appropriate to use the pumping type guardrail column. The

Second, the central median waveform beam protection settings

1, set up in the central divider of the waveform beam guardrail, according to the collision avoidance level can be divided into Am level and Sm level. Sm level guardrail is strengthened, suitable for the central divider with important structures, and need to limit the lateral displacement of the guardrail of the road. There are two types of structure: split-type and combined-type. Split-type guardrail is suitable for the central divider is relatively wide, the central belt in the more things, and in the central divider buried under the pipeline of the road. Combination type guardrail is suitable for the narrower width of the central divider, the central belt within the structure is not much or buried pipeline less road.

2, the central median waveform beam guardrail cross-section layout should be based on the width of the central divider and cross-section form to determine. Layout according to the split-type, should not make the guardrail surface intrusion into the highway building limits.

3, when the split-type guardrail set in the central divider with kerbs, waveform beam guardrail should be blocked. And in the central divider when the deployment of more intense, waveform beam guardrail surface to the surface of the edge of the minimum C value can be reduced to 25cm.

4, the central divider using a combination of waveform beam guardrail, guardrail columns of the centre line and the highway centre line. When the highway centre line position within the structure, underground pipeline, the centre line of the guardrail column can be shifted to one side, or the combination of the type to change into a split type, in order to bypass the centre line position of the structure.

5, the combination of waveform beam guardrail by the column, the cross-separation beam, waveform beam, fasteners, columns can be made of round or channel steel. The spacer beam is made of two channels, which are installed on both sides of the column. The two ends of the spacer beam are connected to the waveform beam plate. The maximum combined width of both sides of the waveform beam is 100cm, and can be adjusted according to the width of the central divider.

6, set in the central divider at the beginning, the end and the opening of the guardrail should be end processing. Split-type waveform beam guardrail, its end should be consistent with the line of the central divider. In a certain length (for example, 16m) range, the waveform beam guardrail from two parallel lines gradually narrowed to a certain proportion of the divider, generally parabolic shape, column spacing of 2m, the radius of the round end should be consistent with the line of the opening of the divider, generally 25cm.

Third, the traffic diversion triangular zone of the guardrail, its structure should be consistent with the roadside waveform beam guardrail, and should be based on the triangular zone of the line and topography of the deployment. The shortest length of its set up: by the highway main line side of the two ends of 8m range and by the ramp side of the two ends of 8m range should be used to strengthen the type (S level), in the middle of the strengthened type of guardrail indirectly 6 A level of guardrail, and with a round head to the triangle on both sides of the guardrail connected. Anti-collision mats should be set up in the scope of the danger triangle.

The centre height of beam of corrugated beam guardrail is 60cm from the road surface to the centre of connecting bolt hole. When there is a kerb, the centre height of beam is 60cm from the top surface of kerb to the centre of connecting bolt hole. When there is a block of corrugated beam guardrail, the centre height is unchanged. Corrugated beam guardrail columns are generally buried in the soil base, the depth of its buried provisions are as follows: a. When the guardrail columns are buried in the soil base, the depth of its buried provisions are as follows.

First, when the guardrail column buried in the soil and no kerbstone, column depth should not be less than 110cm when the guardrail column buried in the soil and kerbstone, column depth should not be less than 125cm when the central divider using a combination of wave beam guardrail, columns buried in the soil, the depth of burial should not be less than 110cm.

Second, when the guardrail column in the following cases, the concrete foundation can be used to bury the method.

1. The column is placed on bridges, passages, culverts and other places that can not be driven into.

2. The column below the underground pipelines, stone sections; and

3. Other special circumstances.

The depth of the column buried in the concrete should not be less than 40cm. For the convenience of maintenance, flange assembly type connection can be used. The size of the concrete foundation, flange connection strength, should be based on different circumstances determined by the calculation. When conditions, it is appropriate to use the extraction type guardrail column.