What are the benefits of low headroom rotary digging rental? What should I pay attention?

At present, the round excavator has become one of the mainstream operating machines for bored piles due to its advanced technology, success, speed and stability. Due to the different engineering geological conditions in different places, different engineering designs are unlikely to be completely consistent with the actual formation, and sometimes they are very different. Therefore, when the geotechnical engineering unit undertakes the bored pile foundation engineering, the pile foundation drilling is faced with considerable uncertainty. In the process of pile foundation drilling, if some technical problems are not handled properly, it will not only increase economic losses, but also pose a threat to the safety of engineering equipment and personnel. Below, the low headroom round excavation lease manufacturer shares the precautions for round excavation between different strata. And what are the benefits of low headroom rotary drill rental? What are the benefits of low headroom rotary drill rental? Based on the practical experience of using round drill bits to drill into various formations in recent years, low clearance round drill bit rental manufacturers have summarized the technical problems and solutions that often occur when using round drill bits in special formations.

If the groundwater level between the soft soil layers is high (such as soft soil, newly accumulated backfill, newly accumulated loose sand), it is difficult to maintain the stability of the tunnel wall even if the drill bit is on the mud retaining wall, and it is easy to shrink the collapsed hole or neck. This formation is distributed in the shallow surface. As the collapse volume increases, the ground around the borehole collapses and the barrier tube sinks in large amounts. In severe cases, it can also pose a threat to drilling equipment and staff. If this happens, especially if the guard hole is found hanging or sinking during the operation, you can't get away with it. Fill the hole as soon as possible, fix the hole barrier again, and then drill again. What are the benefits of low headroom rotary excavation rental? In soft soil, backfill and other places, wrapping the wall with mud can not become an effective resin layer. The effective and safe method of round drilling is to take measures to barrier the cylinder wall. Each rounding rig consists of three or so steel barrier carriers, a vibrating hammer and a crane with sufficient tension depending on the difficulty of drilling. The length of the steel guard can be reduced to the soft floor, and the length of the steel guard end is longer than the length of the pile end.100mm (too large, resulting in waste of concrete). A bit that is too small can easily get stuck on the barrier tube. difficult to ensure smooth operation). When using long protective barrier wall and round excavation, the following matters should be paid attention:

（1) Basically, it is necessary to confirm that there are no large-end feldspar blocks greater than 100mm in the depth range below the barrier. According to the weighted length of Zhang Haotong's end length, select the vibration hammer with appropriate power. (2) When working with small end length, the outer diameter of drill pipe and pipe diameter should be comprehensively considered. The outer diameter of the drill pipe shall be more than 200mm smaller than the pipe diameter. When the length of the pipe is large, the difference should be large to facilitate the operation. (3) The verticality below the steel guard plate should be ensured, especially for bored piles with small end lengths. (4) After the concrete pouring is completed, the protective carrier shall be pulled out in time. (5) The sinking steel casing shall be used in close cooperation with the rotary excavation pile. After the steel shield is pulled out, the lessor believes that it can be immediately sunk into the next operation hole. Such a flow operation can greatly improve the efficiency of the operation.