Long distance high pressure Sandblasting pipe The 2-inch steel pipe (L=6m) shall be installed together with the flange plate. The applied seamless steel pipe and flange plate must meet the quality requirements. The raw materials must be subject to strict engineering acceptance when entering the site, and the unqualified products are not applied; The flange piece and seamless steel pipe must be vertical during electric welding to ensure that the high-pressure shotcrete pipe is vertical during installation; During electric welding, the welding shall be round and smooth to avoid sand hole ventilation, which may cause damage to compressed air and raw materials of anchor spray; When transporting high pressure shotcrete pipes manually, make sure that the dynamic password is consistent and practical. When turning downhill, pay attention to echo each other and bypass to avoid slipping to death; High pressure shotcrete pipes must be firmly bound during loading to avoid safety accidents caused by the dropping of high pressure shotcrete pipes during the whole process of distribution, and extreme high, ultra-high and overload conditions are prohibited.

Polyurethane material and butyl rubber are selected as the key raw materials for the inner rubber of sand blasting pipe, and unique reinforcing agent is added. The color of the inner glue of the finished product is fully transparent, with the characteristics of super wear resistance, high wear resistance, high pressure resistance, etc. The wear resistance index value is average Sandblasting hose 2-3 times. It has a good reputation of "devil resistance" in the industry competition. The cloth clamping, anchoring and shotcreting rubber hose uses high-quality wiping tape as the lifting layer, which has good flexibility and strong ability to work under pressure; The steel braided sandblasting hose is manually woven with stainless steel wire specially used for electroplating copper rubber hose, which bears the pressure of 3-4 times that of the cloth clip hose. It has the characteristics of high compression resistance and anti bending performance.

Before the gushing, the rock surface must be cleaned with high pressure water, and the thick spray marker piles must be set. The distance between marker piles is 3~5m at the two sides and top of the coal roadway. The exposed sign pile is 60mm, and the thickness shall not be less than 50mm. The surge workers shall wear dust masks and dust glasses before construction. Sandblasting pipe Before anchoring and shotcreting, all management centers, measuring points and figure curves in the anchoring and shotcreting area must be maintained. The starting sequence of the wet sprayer is: turn on the compressed air → boiling water → turn on the wet sprayer → feed; The sequence of closing the wet spraying machine: stop feeding → power off → water cut off → stop pressurizing air.