Rock excavation in urban development and civil engineering is getting more and more complicated. The reason for this is the increased urbanization of cities. Cities expand but they also get denser. This means that construction increasingly takes place close to surrounding buildings. Regulations demand safe operation and that noise and dust levels are to be kept at a minimum.
At Epiroc. we always strive to be one step ahead when it comes to noise reduction, dust suppression and safety features. All this without compromising the core values; drilling performance, wide hole range, large coverage area and well balanced drill rigs.
Our Noise Reduction Kit is the perfect equipment for operation in urban areas. Noise Reduction Kit reduces noise levels by as much as 10 dB, making it perfect for job sites with noise regulations. The design is lightweight and sturdy with hydraulically operated hatches. Since noise levels can affect people in and around the job site, you need to be aware of possible regulations. With the Noise Reduction Kit, you are fully prepared to work in an urban environment – without disturbing your surroundings
Here are some of the additional benefits:
Longer working hours
The Noise Reduction Kit minimizes the exposure of sound while drilling and it's perfect for places with noise regulations. So, if working hours are limited due to noise, the Noise Reduction Kit may result in longer working hours as the disturbance decreases. Add to that – it can be remotely controlled. This means higher productivity and greater time efficiency.
Easy to monitor
The lightweight and sturdy design makes it a reliable partner for an enhanced working environment. Thanks to the hydraulic hatches the operator can have total control over the drilling process. It's designed by several modules, which makes it easy to replace parts if needed.
Since the Noise Reduction Kit can be controlled remotely from a distance, the ergonomic situation for the operator is enhanced. Add to that, the feed is encapsulated, which contributes to lower dust- and oil levels in the air. In summary, the kit improves the working environment for both personnel and citizens around the job site.
The types of drill rigs favored by construction drilling contractors, typically tophammer drill rigs, are inherently noisier than for example a DTH rig. One reason for this is that the rock drill is mounted on the feed instead of Down-The-Hole. Nonetheless, the need for noise reduction on urban construction sites can be addressed by equipping the rig with a noise reduction kit, which Epiroc has been offering since 2005. An updated version, is available for use on rigs such as the SmartROC T35 and SmartROC T40, cutting the noise output from these machines from 127 dB(A) unsilenced to 115 dB(A), and making it possible to hold a conversation next to the operating drill rig. A more sophisticated Rig Control System (RCS) also play its part in cutting noise, with the engines on the current generation of rigs responding to second-by-second requirements, rather than running at full speed all the time.
Air blast is a particular phenomenon that is invariably caused by the detonation of unconfined – or inadequately confined – explosives. The resulting pressure wave is manifested as noise and in damage to surrounding properties; even low overpressure levels can break windows, while high energy waves can cause structural damage. Risk minimization is achieved by using careful blasting procedures, and by ensuring that all explosives are confined with an adequate amount of stemming or cover material in place before detonation.
Ground vibrations result from blasting, with the aim of a good blast design being to minimize the peak particle acceleration associated with the propagation of shock waves through the ground. It is quite common for specialized blasting consultants to be involved to assist the contractor with vibration control and the design of drill patterns, as well as to carry out a thorough survey of adjacent structures before the drilling and blasting can begin. The key to minimizing ground vibrations is to optimize the blasting sequence in terms of the amount of explosives being detonated at one time, through the use of a properly designed detonator delay program. In addition, the drill hole diameter should be kept as small as possible, normally in the range 30–50 mm. To eliminate the risk of fly rock, blasts can be covered with inert material such as sand, or by using heavy mats made of timber, rubber or tires, cut into sections and bound together with steel wire. Weighing around 1 tonne each, these mats absorb energy and prevent loose rock from being dispersed, while their structure allows the gases produced by the blast to flow through.