When the rock mass is small in deformation and the stability is good, generally only the concrete is sprayed, and the spray thickness is 50-150 mm, and it is not necessary to hit the anchor rod. When the rock mass is deformed greatly, the concrete spray layer will not be effectively supported, and the spray anchor joint support should be selected. The experiment proves that when the thickness of the sprayed layer exceeds 150mm, not only the support capacity can not be improved, but also the support cost is obviously improved. At this time, the spray anchor joint support should be selected. The anchor rod forms a load-bearing reinforcement arch with the rock body passing through it. The function of the sprayed concrete layer is to close the surrounding rock, prevent weathering and spalling, and combine with the surrounding rock to support the surface rock between the anchor rods. Shotcrete can effectively control the falling of stones between anchors, but it is brittle. When the rock is deformed, it is easy to crack and peel off. One solution is to add steel fibers to the shotcrete to increase the flexural strength and toughness of the concrete. Further shotcrete is laid before the metal mesh, the reinforced concrete layer is formed after spraying, improve the integrity of the sprayed layer, to improve the tensile strength of the sprayed layer, which is spray anchor net joint support, can effectively protect branched broken loose Soft rock formation. The diameter of the steel mesh is generally 6~12mm, and the spacing of the steel bars is generally 200~400mm. Mini concrete mixer can be used to mix dry hard concrete, plastic concrete, flow concrete, light aggregate concrete and various mortars, so they were popular in precast concrete plants, industrial and civil construction works, bridges, water works, roads, airport and harbors. JS series mini Concrete Mixers are double horizontal axle forced mixers with two advantages of independent performance or forming simple concrete mixing plants with PLD series of batching machines. Mini Concrete Mixer Machine,Small Concrete Mixer Machine,Self Loading Concrete Mixer,Home Built Concrete Mixer Shandong Zeyu Heavy Industry Science and Technology Co.,Ltd. , https://www.sdcementsilo.com
Shotcrete support is a kind of support that uses a shotcrete to spray concrete mixture on the rock surface to solidify and harden.