Application and analysis of rock drilling rig in mountain tunnel construction
The Application Effect and Value of Rock Drilling Jumbo in Mountain Tunnel Construction
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1. The drilling rate is faster. Most of the rock drilling rigs use hydraulic rock drill models, which can form a single hole in a short time, which is far higher than the rate of wind-driven rock drilling. In specific operations, multiple holes can be operated at the same time. The number of holes formed for the first time More, reduce drilling time. In the face of tunnel hard rock construction operations, the three-arm rock drill rig has shown great advantages. Compared with the pneumatic rock drill, the drilling speed is 60% to 120% faster. In practical applications, the drill pipe can be quickly positioned without additional Build an auxiliary work platform to optimize the work process.
2. High safety and environmental protection performance. When using the three-arm rock drill rig to excavate, there are operators on the fixed operating platform who are responsible for the operation of the rig. The construction staff can be 10m away from the construction face, which reduces the safety risks of the construction workers from the three-arm rock drill Threatened. At the same time, the labor intensity of the crew of the three-arm rock drilling rig is low, and the noise of the construction surface is low, which basically does not cause negative effects. In addition, no large dust will be generated during the operation, and the air is pollution-free, and only the waste water after construction is required.
3. Have a high level of automation. In the actual application process of the rock drilling rig, various sensor signals can be analyzed by means of computer control and semi-control, and converted into a digital signal mode. The corresponding internal display in the cab can promptly display the boom and The specific position and inclination angle of the propelling beam. Utilizing the control advantages of the computer, the boom system always maintains a normal operating state, and the trolley computer can locate and adjust the positions of the boom and the propulsion beam in time. Drilling holes can be accurately selected in the hole layout map preset by the computer to reduce the occurrence of drilling errors.
4. Has a wealth of operating functions. The rock drilling rig is used in mountain tunnel engineering excavation operations. The manipulator of the three-arm rock drilling rig can be used to carry out a variety of construction operations in all directions, including predicting and forecasting deep hole geology, carrying out radial system bolting operations, and implementing Compared with traditional hand-held pneumatic rock drills, this type of rock drilling rig has a wide range of applications, such as advanced small pipe construction operations, and it has a good effect in the construction environment of broken weathered rock from II to V. It has the advantages of safety and efficiency.
Application of Rock Drilling Jumbo in Mountain Tunnel Construction
1. Construction preparation
(1) Water supply. A large amount of water resources are used during the excavation operation of the rock drilling rig. On the one hand, because of its large mechanical volume, due to the existence of dense pipelines, there are many heat generating units, and a large amount of water is needed as a cooling support; on the other hand, In specific drilling, a large amount of water needs to be used to continuously flush the ballast in the drilling body to reduce the occurrence of stuck drilling. During on-site construction operations, a special reservoir is required, which can reach 300m³ to meet the requirements of the three-arm rock drilling rig.
(2) Preparation for ventilation. Tunnel engineering excavation operations will involve larger sections, which require the use of drilling and blasting methods, the amount of ballast produced in the trackless transportation system is large, and there are many internal combustion engines in the operation of the equipment, and it is necessary to effectively promote the ballasting, The smooth implementation of construction links such as transportation and secondary lining needs to be controlled according to various conditions during the operation, such as excessively long ventilation pipelines, excessive air resistance, residual smoke and carbon monoxide without timely ventilation after blasting, etc. So as to create a healthier environment for construction workers. In this regard, it is necessary to select a suitable fan model, continuously improve the wind sock assembly work, and use two 160kW fan units as a set of models to strengthen the ventilation effect during the operation.
(3) Preparation for power-on. If the three-arm rock drilling rig wants to maintain normal operation, the voltage should be controlled, and a 400V booster should be installed within the working area, which can achieve good results. In the concrete excavation, a safe distance is always maintained, that is, the end of the booster and the excavation surface are controlled at about 100m. At the same time, with the excavation of the cave, the position of the booster must be continuously extended.
2. Construction process
(1) Drilling
Promote the construction of the mountain tunnel project under the action of the three-arm rock drilling rig.
①Use Leica 120+ total station to carry out lofting and sampling operations, focusing on lofting for the full-face excavation contour. Generally, controlling the point interval of about 50cm can have a good effect.
②Control the implementation effect of drilling work. After the preparation is completed, the drilling operation is carried out according to the pre-set blasting design plan. Arrange the blastholes in compliance with the various standards of the measuring line, and blast with the help of wedge cuts. In this excavation and drilling work, the rock itself is hard, and the first half of the drill pipe is mainly used. In addition, the strength level and use rate of the drill itself are not high enough, which affects the actual drilling effect. Finally, contact the merchant in time for special Customized drill bits and drill rods with higher strength have effectively increased the rate of operation.
(2) Hole cleaning and blasting
Actively carry out the cleaning and filling operations of the blastholes, use the charging trolley, and fill the intervals between the holes to ensure the effect of the charging work. After the charge is over, the blasting area must be within a diameter of 300m without the participation of any machinery or personnel, and the blasting work shall be carried out after ensuring that there is no excess material. The three-arm rock drilling rig has a hole diameter of 45mm. To carry out blasting work, it is necessary to use rock emulsion explosives. The radius is changed from φ32mm to φ19mm. In this way, the coupling between the charge and the blasthole can be enhanced to make the blasthole The total number has been reduced and the blasting efficiency has been improved. The loading platform directly loads explosives and has a small space. It is necessary to repeatedly transport explosives, detonators and other items, and the overall operation efficiency is not high. To improve this situation, a charging trolley can be installed in the operation area to increase the actual rate of explosive charging.
(3) Ballast
Give full play to the advantages of the three-arm rock drilling rig, control the implementation effect of blasting operations, carry out ventilation operations in a timely manner, and fully eliminate the dangerous factors of the tunnel face, promptly promote the implementation of ballast operations. First of all, during the actual ballasting process, the lumps of the broken ballast in the tunnel are carefully checked. If the lumps are large, the lower circulation blastholes should be appropriately increased; and if the lumps are small, the lower circulation blastholes should be appropriately reduced. At the same time, adjust the quantity of charge in time. Secondly, after the broken ballast is out of the ballast, real-time detection of the initial support section is carried out, and the phenomenon of over-under-excavation is found, and the adjustment of the cyclic blasting data with good support can greatly increase the efficiency of light blasting and reduce the number of specific blasting operations. The disturbance of the rock reduces the time of subsequent operations.
Summary：
The rock drilling rig has a good application effect in the current construction of mountain tunnel engineering. It has a fast drilling rate, high safety and environmental protection performance, and has a high level of automation and rich operating functions. In the process of implementing mountain tunnel engineering excavation operations, it is necessary to strictly control various construction steps in accordance with the specific project implementation conditions to improve the overall construction level of the project.
