Vibration Behavior during Underground Drilling Based on an Innovative Measurement Method and the Application

Pressure relief drilling is one of the most common techniques to reduce the impact of rock burst, but the useful dynamic phenomena in the drilling process are ignored due to the lack of corresponding technical methods. Based on the fact, an innovative measurement method for vibration signals during the drilling construction by pneumatic drill rig is presented in this study. The acquisition and analysis of vibration signals show that the vibration information can reflect the drilling depth, the amplitude of different depth can reflect the pressure, and the vibration events of different depths can reflect the pressure relief effect. The method proposed in the study is of great significance to the supervision of the relief work quantity, the disclosure of the pressure situation, and the evaluation of the pressure relief effect.

DEVELOPMENT OF SEEDING CONTROL SYSTEMS FOR GRAIN DRILLS AND SOWING MACHINES

The paper discusses technical aspects involved in developing seeding control systems for grain seeders and sowing machines. Construction and technological parameters of seeding control systems are based on the analysis of the available machinery. As a result an operation-performing unit was constructed and tested in field trials. The RatinalRose visual simulation environment was used to design the software of the seeding control system. The environment allowed for interpreting the volume concentration of particles. A procedure for collecting and presenting data was developed. COMPAS com106 puter program was used to create a 3D design of the sensor and measure its parameters, then the sensor case was made using a 3D printer. Field trials involved comparing 2 identical drills under identical conditions. The drill equipped with the seeding control system had better indices of time saving and efficiency (by 22 %). The study results allowed us to develop the software for the seeding control system and determine the optimal design and process parameters of the seeding control sensor for a pneumatic drill in order to reduce clogging in the seed pipes and improve the quality of seed distribution.

A stratigraphic sequence of six thousand years : Preliminary report on the rescue excavation at the site of the former Óbuda Distillery (BUSZESZ)

Árpád period pit houses with a stone oven, Roman period brick graves and public baths, debris from Middle Bronze Age buildings, an Early Bronze Age cemetery, and Late Copper Age clay pit complexes – the thousands of archaeological features that appeared one below the other in a several metres thick stratigraphic sequence, and the nearly thousand boxes of finds are only one side of the coin. The other is represented by the constant roar of the machines, the deafening noise and the dust clouds from the pneumatic drill, the rhythmical sound of the suburban railway, the hubbub of construction workers, and the tight archaeological deadlines. At the site of the former Óbuda Distillery, during the almost three years of test and rescue excavations, we have encountered nearly all known elements of urban archaeology. We also appreciate that, in spite of the difficulties, we were given a unique, extraordinary and perhaps unparalleled opportunity. The site, after all, lies at the edge of the historical cores of the Roman Military Town and medieval Óbuda. The excavation site is noteworthy not only in terms of its vertical but also its horizontal extent. Following the highly informative period of fieldwork, hopefully we can begin the analysis as soon as possible, through which we may understand, step by step, the significance of this special place, where, until now, there lay the stratigraphic sequence of six thousand years of human presence.

Modelling Construction Dust Safety Distance

Construction dust may lead to Silicosis, a disabling respiratory disease which severely threatens the life of construction workers. Therefore, it is important to predict and determine the safety area of dust generated by the construction process and the corresponding protective measures that must be adopted. In this paper, based on real site data, we modelled and simulated the pneumatic drill holes in rock drilling processes to analyze the dust distribution on construction sites. Our simulation results show that the dangerous distance from the pneumatic drill hole is 3.5m. Within the dangerous distance, the dust concentration ranged from 0.039 mg/m3to30mg/m3, and decreased as distance increases. Within the dangerous distance, dust alleviation technologies are strongly recommended and appropriate protective measures must be adopted by construction workers.