The method of anchoring the anchor net before the mortar is sprayed on the shotcrete The shotcreting machine uses two diggers and one anchor before the shotcreting of the anchor net. It strictly adheres to the circular attack and asks the top system. Before hitting the anchor rod, it must hit the cap and pillar. The top control distance must not exceed the measure.
The arrangement of bolts shall comply with the requirements of the regulations, the distance between the rows should not exceed ±100mm, the angle of the bolts should not be less than 75° perpendicular to the rock face or the roadway contour, and the number of resin resins used for bolt installation and the parameters of the bolts must meet the requirements of the regulations; otherwise In addition to re-supply.
After the installation of the bolt, the tray is tightly attached to the rock surface, 40mm< exposed length of the anchor bolt>60mm (calculated by the surface of the cushion).
The lap length of the metal mesh and steel strip must not be less than 100mm.
When the gangway is prohibited from smashing the roof, the following methods should be used to deal with the gangs: The metal mesh must be in close contact with the rock surface. The metal mesh must not be filled with any material, and low-pitches should be sprayed with sprayed material.
The rock surface must be brushed before the shotcrete to find the net floating rock. The spray layer should be even and smooth, no gaps, no top off, no fried skin, no holes, no exposed steel strips or anchor nets, no skirts, and the depth of the wall base should be reached. Design requirements.
Every 30 to 50 meters a set of concrete test block, shot quality, material, ratio, stirring, etc. to meet the specification requirements, the initial spray thickness to cover the metal mesh is appropriate, in principle, 30 ~ 50mm. The design requirements for re-spraying shall be such that when the double-spraying is on top, the wire shall be hung, and the arched tunnel shall be no less than 5 lines.
After spraying by the spray gun, each class was sprinkled with water and the continuous curing time was not less than 7 days.
After the tunnel has been formed, the net height and net width must meet the design requirements and a single spot (with a length of no more than 1 meter) must be found.
The middle and waist lines are followed by the wing machine, and the temporary middle and waist lines are set before the wing machine. After the crash, there must be a red waist line for measurement.
The anchor cables are arranged according to the measures. The parameters of the anchor cables meet the requirements of the measures. The anchor cables are as far as possible perpendicular to the contour of the roadway.
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