PC hollow solar panel NINGBO CHAOMEI PLASTIC CO.,LTD , https://www.nbpcban88.com
The flexible screen and the rigid shield are structures that move down as the wellhead advances the face. It only serves as a cover and not as a support. The flexible cover net consists of a 6- section angle steel curved member, and a three-layer flexible net is laid outside the skeleton. The rigid shield cylinder is composed of an inner layer, an outer layer and a suspension device. The outer layer is high & $ is suspended under the base film of the active template. The inner layer is high )!"'$It is suspended by four stable cars. The distance between the inner and outer layers is retractable.
2 permanent support
(1) Shotcrete wall
Since the mid- 1960s , China has used sprayed concrete for permanent support in shafts, due to its high degree of mechanization, high speed, good quality, low cost and wide application. However, when the amount of water inrush is large, the quality is not easy to ensure, so it is generally applied under conditions of small water spray. The equipment for the shotcrete mechanized line is arranged in two ways, the jet is located near the wellhead and the jet is placed on the hung.
(2) Watering concrete shaft wall It has high strength, good integrity, good water sealing and easy mechanization. It is the most widely used form of well support.
1 Temporary support Several temporary support forms are shown in the table.