Selection process of rock drilling rig

Selection process of rock drilling rig

The model and manufacturer of the rock drilling rig should be selected according to the matching method of the tunnel section size and the maximum positioning trajectory of the rock drilling rig. According to the number of drill booms, the rock drilling rig is divided into three arms and one basket of rock drilling rigs, two arms and one basket of rock drilling rigs, etc. The operating range of the three arms and one basket of rock drilling rigs can reach up to 13×15m (height×width). ), the operating range of the two-arm and one-basket rock drilling rig can be up to 9×14m (height×width), and the procurement and loss costs are about 60% of the three-arm and one-basket rock drilling rig. Therefore, considering the cost, As shown in Figure 1 tunnel a, two-arm and one-basket rock drilling rig should be selected for the tunnel section, and three-arm and one-basket rock drilling rig should be selected for Figure 2 tunnel b. However, due to the limitation of the construction scope of the two-arm and one-basket rock drilling rig, there are disadvantages that users cannot be used universally when undertaking other larger-section tunnels and the construction speed of the two-arm is slower than that of the three-arm. In addition, when choosing whether to use a fully computerized console car, if the application tunnel has high humidity or the surrounding rock is relatively broken, the full computer control is not applicable to the tunnel, because the computer trolley sensor is susceptible to moisture and malfunctions, causing abnormal construction costs Increased height, the automatic positioning of the drill boom and the adjustment of the drilling position cannot adapt to the complex surrounding rock conditions. It can only be used in manual mode. The construction efficiency has no obvious advantage compared with the full hydraulic trolley.

 before purchasing according to the equipment parameters provided by the equipment manufacturer, the user should provide the supplier with construction design drawings, geological survey reports, and request the supplier to conduct an on-site construction adaptability analysis and provide hydropower layout, maintenance site layout, common wear parts list and loss Estimate (yuan/m³). The user should meet the equipment entry conditions and recruit professional drillers and maintenance personnel according to the supplier’s analysis report. Before the equipment is delivered, the user should also assign the driller and maintenance personnel to the supplier’s workshop to accept the application of rock drilling rigs and Maintenance-related professional training, personnel who cannot obtain the training certificate shall not participate in the construction.

Application management of mountain tunnel excavation construction

Traditional mountain tunnel blast hole construction is carried out by a large number of manual and hand-held pneumatic rock drills. Workers stand on the work bench in layers, close to the face of the tunnel, and face huge safety risks at all times. Using trolley construction, the driller's distance from the face is greater than 5m, and the roof of the rock drilling rig has the ability to prevent smashing, which greatly improves the safety of drilling construction. However, due to improper operation and neglect of management in the construction process, there is still a risk of safety accidents. Therefore, tunnel mechanization construction should also strictly follow "pipe advancement, strict grouting, short excavation, strong support, early closure, frequent measurement "The Eighteen Characters Policy.

Drilling rig maintenance and shift management

After the construction of the rock drilling rig is completed, the fasteners, wire ropes, guide sleeves, limit blocks, seals, lubrication, nitrogen, impact hoses and other parts on the drill boom and thruster should be inspected, reinforced, Adjust or replace. The maintenance of rigs implements the principle of “equal attention to maintenance, and precautions first”, attaches importance to maintenance work, formulates "lists and records of shift inspections, weekly inspections, and monthly inspections of rock drilling rigs", and conducts “class inspections” in a planned manner. "Weekly inspection" and "monthly inspection" work, using a combination of daily maintenance, regular maintenance and mandatory maintenance. The maintenance of the trolley is carried out in addition to the "daily inspection", "weekly inspection" and "monthly inspection" maintenance in the working gap of the trolley, as well as mandatory centralized maintenance in accordance with the requirements of the maintenance procedures provided by the manufacturer. Maintenance work must be performed by a dedicated person immediately after the completion of each shift and accurately recorded. Important parts that need to be replaced during maintenance must meet the requirements of the original machine. Standard use must not be lowered, not to mention missed inspections and missed repairs to leave hidden troubles. The next construction team. The management personnel will check the maintenance results and formulate reward and punishment measures.

Summary：

The construction of rock drilling rigs is different from general engineering machinery such as excavators and loaders. Construction unit managers cannot follow the procurement, application, and maintenance methods of general engineering equipment, and equipment suppliers cannot follow the sales and service mode of general equipment. During the pre-sales, after-sales, construction, and maintenance of the trolley, the equipment supplier shall track the entire life of the trolley and provide professional use and maintenance training. User-side managers should also formulate standardized construction management, personnel management, maintenance management and loss management systems to achieve the mechanized safety, low cost and high efficiency of mountain tunnel drilling and blasting construction.