Brief Introduction of Hong Yuan Hydraulic Face Drilling Rig

In the past two years, the relationship between China and United States have fallen into a freezing point, and the trade war is becoming more and more intense. During this period, the Chinese government urgently needs to promote its domestic demand in order to counter the US trade, technology and market block. To stimulate domestic demand, we need to build the foundation of science and technology as a support, and to use the infrastructure construction as a powerful weapon.

At present, the construction of long and large tunnels in China's infrastructure construction has rapidly increased with the development of Chinese economy. Tunnel rock drilling rig refers to large-scale rock drilling equipment for tunneling and drilling operations. It is widely used in railway, highway, water dam and national defense projects. The shape of tunnel rock drilling rig is shown in the figure. Currently, the construction of long tunnels requires higher standards for rapid excavation, low energy consumption, construction safety, environmental protection and health of construction workers. Tunnel rock face drilling rigs are becoming more and more widely used to meet these requirements.

The coverage area of the tunnel drilling rig is 100-200 m2, and the drilling length is 4-5 m. Face drilling rig is generally equipped with 2 to 3 booms, and very few models are equipped with 4 booms. At the same time, the working service platform, also known as the observation deck, is generally installed on the rig. Each boom is equipped with a high-power rock drill, and the impact power is generally not less than 18kw.

In addition, tunnel face drilling rigs are generally with tires, and a few rigs are rail-wheeled. Tunnel face drilling rigs are generally equipped with dual-powered diesel engines and electric motors. Diesel engines are mainly used for tramming and the motors are mainly used for rock drilling.

The tunnel triple-boom rock drilling rig has the advantages of fast drilling speed, multiple holes in one operation, rapid and accurate positioning, good excavation quality and tight connection. It has an advantage in tunnel excavation, support and accurate geological prediction. The application of the triple-boom rock drilling rig is currently in a period of rapid development. There are still problems such as expensive machine costs, expensive maintenance costs, good after-sales service system and low level of operators. The promotion and application of triple-boom rock drilling rig is seriously affected. Obviously, how to make it more widely used for promotion and application is a problem that needs to be researched and practiced.

According to the online information, as of the end of 2017, there were a total of 16,229 highway tunnels in China, with a length of 15,285km, including 4013.2km long tunnel (length ≥3km); 14547 railway tunnels with a total length of 15,326km. The length of the special long tunnel (length ≥10km) is 368km.

At present, the current situation in our country is that the number of long tunnels is increasing rapidly, resulting in lower tunnel design elevations, increased buried depth, and ultra-deep tunnels (buried depth >500m). Its related construction difficulties and schedule requirements are improved.

Hebei Hong Yuan Hydraulic Machinery Co., Ltd. and Face-Drilling Rock drilling rig and the Model

China began to introduce and use foreign advanced tunnel drilling rigs in the late 1970s. Imported equipment is expensive and the after-sales service cannot keep up at that time. Until 2015, China's tunnel face-drilling rig products have developed rapidly. There are 13 companies producing tunnel drilling rigs in China. Up to now, there are 6 companies that are reported, including Xugong Machinery, Hebei Hongyuan Machinery, Tiejian Heavy Industry, China Railway Equipment, Xintong Machinery, and Zhejiang Zhigao Machinery. It is less than one-third of the total number of production companies. It can be seen that the promotion and application of rock drilling rig products in China still has a long way to go.

In 2000, Hebei Hong Yuan Hydraulic Machinery Co., Ltd. successfully developed the HYKD series of rock drills for metallurgical industry, and achieved great success after being introduced to the market. Subsequently, the company developed the HYG series of mining rock drills and gradually began to produce long-hole mining rigs and tunnel drilling rigs. At present, the face drilling rigs produced by Hebei Hong Yuan Hydraulic Machinery Co., Ltd. are divided into 8 series. And the underground mining rigs are divided into 3 series. 

The research and development of tunnel face drilling rigs developed by Hebei Hongyuan Hydraulic Machinery Co., Ltd. started in 2011. The company produces single-boom, twin-boom and triple-boom rock drilling rigs. The CYTJ86A3W triple-boom face drilling rig uses independent hydraulic system to control three different booms. The drilling booms are retractable and have a large working coverage. It is suitable for section (width × height) 17.4×13.3m. There is a work service platform between the drill arms to facilitate workers to work at heights. The tunnel drilling rig is shown below:

CYTJ76A single-boom face drilling rig

CYTJ76A2 twin-boom face drilling rig

CYTJ86A3 triple-boom face drilling rig with a service basket

Hong Yuan hydraulic face- drilling rig uses a unique hydraulic-controlled telescopic boom to keep the propulsion beam parallel in all directions. The system has the functions of automatic impact, automatic anti-jamming, and induction water slag. The center gravity of the entire rig is low. The diesel engine is used for tramming with max. 16km/h, and the gradability is ≤14°.

The drilling rig can accurately calculate the position of the blast holes and achieve a good smooth blasting effect. In particular, the anchor holes above the top of the tunnel can be drilled to the effect perpendicular to the tunnel wall, and therefore, solve the problem of insufficient manual drilling. With the equipment self-supporting basket assist, the quick and safe bolt installation, the simple construction process, the accurate angle, the fast drilling speed, and small number of labors can all be guaranteed. As an integrated professional tunnel excavation equipment, the integrated construction of drilling, injection and anchor can be all be realized.

The machine can be equipped with intelligent control system. It can realize the automatic positioning and the automatic adjustment of the boom attitude. The drilled layout plan designed in advance can be imported into the control system. And the attitude of the boom can automatic shift adjusted.

Implementation effect of Hebei Hong Yuan Hydraulic Drilling Rig

The drilling speed of Hong Yuan drilling equipment is very quick. Generally it only takes around 2 minutes to drill a 3 meters deep blast holes regardless of the hardness levels of rock condition. It is much faster than pneumatic drills, especially in medium hardness rock. At the same time, the drilling rig has obvious advantages in reducing the intensity of manual excavation, upgrading the working environment, and improving the efficiency of mechanical equipment. The data analyze capability is a new feature during the drilling process. Through the real-time data analysis during the drilling process, the front-and-surrounding rock conditions can be preliminarily analyzed, and measures can be taken in a timely and effective manner.

The rock drilling rig is very efficiency to excavate the tunnel. The one-time excavation operation is performed by smooth blasting to minimize the disturbance to the entire environment. The drilling process can be constructed by full-section or step method. The smooth blasting construction parameters and adjustment measures are applied according to the different geological conditions. The drilling rig is controlled to ensure the optimal overall effect of the excavation and maximum meters of the drilling.

Through the application research of rock drilling rig in tunnel construction, the advantages of large drilling rig are fully achieved- strong flexibility, low pollution, safe operation, efficient drilling, and high quality work, etc.