1.PVC shell should be firm, stable, neat and beautiful. Materials should be hard materials such as masonry and color steel plates, and colored striped cloth, bamboo basketry and clay solid bricks are not allowed. Municipal road engineering should also set up a red light warning.

2. Within the influence range of deep foundation pit, PVC enclosure should be selected for the enclosure in densely populated areas.

3. The PVC enclosure in the construction area and living area is generally not less than 2.5m in the urban area and not less than 1.8m in other places.

Height of 4.4. The PVC envelope should not exceed 2.5m, the column spacing should not be greater than 3.6m, and the wind resistance of the envelope should be calculated.

5. Number five. PVC shell and foundation shall be designed and calculated according to national standards and specifications. Hollow wall masonry method should not be adopted, the thickness should not be less than 200 mm, concrete pilaster should be set for PVC enclosure, the distance between pilaster should be set according to the design requirements and should not be greater than 5.0m, and two φ 6 @ 500 Rachel bars should be set between the wall and pilaster.

6.6 users. The PVC shell should be inspected regularly, and corresponding reinforcement measures should be taken immediately if there is cracking, settlement and inclination.

7. Advertising or publicity signs should not be erected in or near light-weight casings (such as PVC casings). If it is really to be erected, the stress system should be independent and designed and calculated.