Height-limited rotary drilling: What is the working principle of a rotary drilling rig?

Rotary digging machine is a kind of engineering machinery suitable for hole-forming operation of building foundation engineering. It is mainly suitable for the construction of sand, cohesive soil, silt and other soil layers, and is widely used in the construction of cast-in-place piles, continuous walls, foundation reinforcement and other foundations. So, height limit rotary drilling: what is the working principle of rotary drilling rig?

Height-limited rotary drilling: What is the working principle of a rotary drilling rig?

Rotary drilling rig is the use of drill pipe and drill bit rotation and gravity to make soil cuttings into the drilling bucket. After the drilling bucket is filled with soil cuttings, lift the drill bit for excavation. In this way, through rotary digging, cutting soil, lifting, digging drill bucket, repeated into the hole. Suitable for hard clay, soft sub-clay, strong weathered sandstone and other different hard geological pile foundation hole-forming excavation.

Limit height rotary excavation:What is the composition of a rotary drilling rig?

Rotary drilling rig is composed of operating system, power system, action system and drilling system (guide rod, drill pipe, drill pipe, long and short screw). The operating system is controlled by a computer and driven by hydraulic pressure. The power system is powered by a diesel engine for drilling and walking, and a crawler walking system is adopted.

What is the difference between round rod rotary drilling rig and square rod rotary drilling machine?

1. The round rod rotary drilling rig, that is, the machine lock rod rotary drilling rig, has some actions during the operation, which is the same as the large rotary drilling rig. Every time the drill pipe is lifted from the borehole, it must be unlocked in reverse. There is a certain skill in unlocking. The operation of a square-rod rotary drilling rig is similar to that of an excavator. It has high drilling efficiency and can drill one meter in a minute. Compared with the machine lock rod rotary drilling rig, there is no need to unlock.

2. The drilling depth of the round rod rotary drilling rig, that is, the machine lock rod rotary drilling rig, can reach 30-60m, and the maximum drilling diameter of the dual power head can reach 2.6m. However, the drill hole limit of the square rod rotary excavator is 30m and the maximum hole diameter is 1.5m.

3. Round rod rotary drilling rig, I .e. machine lock rotary drilling rig, has a starting price of about 350000 within 15 meters, reaching several million units. The 135 type rotary drilling rig within 15m of the square rod rotary drilling rig is only about 230000.

4, round rod rotary drilling rig, that is, the machine lock rod rotary drilling rig, can drill soil, pebbles, strong weathered geology, even moderately weathered and hard geology. The square-rod rotary drilling rig can only drill soil, pebbles and strongly weathered geology.

To sum up, from the above four points, it is concluded that the round rod rotary drilling rig, that is, the machine lock rod rotary drilling rig is safer, the work efficiency is higher, and the scope of application is wider.

The rotary excavator was officially constructed in China in 1999, and the state has not yet stipulated a formal operation certificate, which belongs to special work. Because the rotary excavator is used for foundation construction, that is, pile foundation. The drill is working underground and is invisible to the naked eye. This is established by the on-board computer and the experience of the machine operator, so the requirements for the operator are relatively high.