Matters needing attention of isolation pier

1. The comprehensive factors such as strength, performance, economy and beauty must be considered in the selection of traffic isolation facilities.

2. Considering the convenience of storage and maintenance of maintenance materials, the types of traffic isolation facilities should be minimized.

3. The setting of traffic isolation facilities should consider its lateral clear width and end clear distance. The lateral clear distance is 0.25~0.5m at the outermost edge of the isolation facility, and the end clear distance is 2 ~ 4m at the outermost edge of the isolation facility. 1. Lane separation facilities are used to separate traffic flows traveling in the opposite direction or the same direction, and have the function of prohibiting vehicles from turning left in and out of the road and pedestrians from crossing the road at will. Generally set on the road center line or lane separation line. Lane isolation facilities are divided into lane center isolation facilities (opposite separation) and lane boundary isolation facilities (opposite separation).

2. Roadway isolation facilities mainly adopt three forms: green belt, isolation guardrail and concrete collision wall. Within the urban area, the preferred forms are green belt and isolation guardrail in turn; In the suburbs, the preferred forms are green belts, concrete crash walls and isolation guardrails.

3. The same road should be equipped with uniform roadway isolation facilities.

4. The newly-built or rebuilt roads that meet one of the following conditions can be equipped with isolation facilities in the center of the roadway:

(1) Where there are elevated roads and large piers in the road and there are no other isolation measures.

(2) Bridges, elevated roads, interchanges, tunnels, two-way traffic entrances and exits, and ground roads connected with road sections.

(3) Transition section of two-way traffic connection between high-grade roads and general roads.

(4) Urban roads with more than four lanes.

5. Lane boundary isolation facilities can be set at the position of the extension line of the approach roads of bridges, viaducts and overpasses.

6. The roadway isolation facilities should be obvious and obvious, and the end should be equipped with reflective facilities. In the road section with no lighting or poor lighting, reflective facilities should be set on the whole line, and reflective or anti-collision facilities should be set at the end. For the forms and settings of reflective facilities and anti-collision facilities, please refer to the relevant sections of this guide. 1. Machine non-isolation facilities are used to separate the traffic flow of motor vehicles and non-motor vehicles traveling in the same direction, and are set on the dividing line between motor vehicles and non-motor vehicles.

2. Machine non-isolation facilities mainly adopt green belts and isolation guardrails.

3. On the same road, unified mechanical and non-isolation facilities should be set up.

4. Non-motor vehicles and motor vehicles are located on the same plane, and the lane width of non-motor vehicles is greater than1.5m. Non-isolation facilities can be set up.

5. In the road section, when non-motor vehicles and pedestrians are on the same plane, non-isolation facilities for vehicles can be set with reference to sidewalk isolation facilities. 1. Sidewalk isolation facilities are set at the outer edge of the sidewalk to protect pedestrians from moving on the sidewalk in an orderly manner and prevent pedestrians from stepping into and crossing the roadway at will.

2. Sidewalk isolation facilities are mainly in the form of green isolation belts and sidewalk guardrails. In the urban area, when the sidewalk width is more than 2.5m, the preferred forms are green belt and sidewalk guardrail in turn; When the width of the sidewalk is less than 2.5m, the sidewalk isolation facilities shall be provided with sidewalk guardrails.

3. When the type of sidewalk isolation facilities adopts green isolation belt, the design and construction can be carried out with reference to the relevant provisions of municipal design.

4. Sidewalk isolation facilities with uniform style shall be set on the same road section.

5. If one of the following road traffic conditions is met, sidewalk isolation facilities can be set up for newly built or rebuilt roads:

(1) Where there are commercial sections and intersections on urban roads.

(2) Intersections where traffic lights are installed on urban roads.

(three) the entrances and exits of stations, docks, subways, overpasses and large public places and the roads connected around them.

(4) Parking lots (garages) and local sections of entrances and exits of large and medium-sized units connected with roads.

6. The establishment of sidewalk isolation facilities is a passage for vehicles and pedestrians in accordance with regulations, and should be set according to the needs of traffic management while ensuring safety.

7. When the sidewalk isolation guardrail encounters obstacles, such as fire hydrants, postboxes, telephone poles, etc., the principle of avoidance should be adopted, or the guardrail opening should be combined with obstacles to maintain the continuity and aesthetics of the guardrail without affecting the function of obstacles.