The method chart of tunnel excavation is a schematic diagram used to guide the process of tunnel excavation and drilling. Drilling is an important link in tunnel excavation, which directly affects the efficiency and quality of tunnel excavation. The drilling method chart and its related contents will be introduced below.
I. Preparatory work
Before you start fighting, you need to make the following preparations:
Check whether drilling equipment and tools are complete and in good condition, and handle problems in time if found.
According to the construction requirements, determine the position, angle and depth of drilling.
Mark the drilling position, and remove the floating soil and stone slag.
Prepare water source and cleaning agent and lubricate the drilling rig.
Second, the operation steps
The method chart of drifting and drilling usually provides the following operation steps:
Place the drilling machine at the marked position and adjust the appropriate angle and depth.
Turn on the water source and introduce water into the drill to ensure that the inside of the machine is wet.
Start the drilling machine and start drilling. During drilling, the drilling speed should be adjusted according to factors such as rock hardness and joint development.
After drilling, turn off the water and take out the drilling machine.
Clean and blow dry the perforated eyes and make records.
Third, matters needing attention
In the process of drilling, attention should be paid to the following items:
Wear labor protection articles such as protective glasses and gloves when operating.
In the process of drilling, it is necessary to observe the changes of rocks at any time to avoid injury accidents caused by rock breakage.
During drilling, attention should be paid to keep the drilling rig clean and lubricated to avoid damaging the machine.
In the process of operation, safety awareness should be maintained to avoid accidents caused by negligence.
In a word, the drilling method chart is an important guiding document, which is of great significance to the drilling process in tunnel excavation. In practice, it should be applied flexibly according to specific conditions to ensure the safety and efficiency of tunneling.