Road and bridge engineering knowledge

(1) The mechanical equipment should be selected according to the principle of “advanced performance, reasonable supporting, and ergonomic efficiency” according to the technical requirements of mechanized construction of large section (long) tunnel.

Generally, large-section excavation of tunnels can be carried out with 18~26 sets of pneumatic rock drills for multi-layer drilling platforms; for advanced tunnels, advanced hydraulic drilling rigs should be used for construction, and special guns should be used to process the mud. Ensure the quality of the drug blockage.

(2) The selection and matching of the slag transportation equipment should ensure that the mechanical equipment fully exerts its functions, and the slagging capacity and transportation capacity should be adapted to the excavation capacity, so that the shipping capacity should be greater than the maximum excavation capacity.

The long tunnel will be transported with slag, and it should be equipped with high-power, large-capacity and advanced performance shipping equipment to speed up the construction progress.

(3) The slag should be selected to have high efficiency in the tunnel section, and the slag loading capacity should be compatible with the volume of the transport vehicle. The mode of transportation is based on the length of the tunnel, the equipment and the construction conditions, and the orbital or non-track transportation mode is adopted; the contractor must strictly implement the approved transportation plan during the construction process. Do not return to the second time.

(4) Excavation of more than 200m, tunnel construction must be implemented with ventilation, ventilation and fan power requirements.