From the definition of needs and existing equipment, the choice was made to replace the carrier body with a drilling / coring system connected to the hydraulic pump. Specifications for this replacement will be issued and sent to three different suppliers. The core system was able to percuss soil samples up to 2 m deep with a 100 mm diameter gouge. Even the drilling system could operate in rotation with a helical auger of 100 mm diameter to drill boreholes up to 4 m deep. The company Sedidrill (Guainville, 27) was selected to meet these specifications. Sedidrill type 80 tool is called drill-core in the following document.
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The drill bit manufacturers mode of the core drill is used by archeology research teams to conduct soundings, but also in hydrology to set piezometers. A piezometer is a tube that allows access from the ground surface to the water of the water table, in order to measure the height and, in our case study, to collect the water to analyze its chemical composition. In our case, with the drill core drill, it is possible to install piezometers of 100 mm diameter and 10.5 m maximum depth and to access so-called superficial sheets. In general, when the material to be drilled is not consolidated, the piezometer is cased from the ground up to the base to prevent the drilling from closing with the erosion of the walls. The base of the pipe is spun and the space between the borehole and the casing is filled by a filter bed at the level of the strainer and then by swelling clay such as bentonite. The bentonite is impermeable and allows the strainer to be hydraulically insulated from the soil surface. The last meter before the surface of the ground is completed by cement. Cutting, the name given to the material discharged during drilling, can be used to fill the space between the borehole and the casing. In this case, the cutting will be placed between the bentonite and the cement. Once the piezometer is in place, it is possible to measure changes in the level of the water table (the piezometric level) during the year and to sample the groundwater for hydrochemical measurements.
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The core drilling machine is a machine whose use may involve significant risks for operators. To cope with these risks, it is equipped with several security features. Two punch-type emergency stop boxes are positioned on each side of the machine. Once activated, they immediately stop any movement by stopping the hydraulic pump. They can only be reset if all the control levers are in neutral position. In addition, a first aid kit and a fire extinguisher are permanently on the machine. PPE (Personal Protective Equipment) such as a helmet, gloves, hearing protection and safety shoes must be worn by operators. Isolated work is to be avoided and operators must have a mobile phone.
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In 2012, the regulation concerning the compliance of drilling machines has evolved. The Ministry of Labor, based on the brochure of INRS ED 6111, has imposed three in-service machine conformations: 1. gimbal machines must be equipped with a fixed guard, 2.protection of moving parts 3.Working on rotating components must be able to be carried out when the machine is stationary. Following this new regulation, various work of compliance has been carried out by Sedidrill. The notches on the levers controlling rotation, up-down and hammer have been removed in order to force the operator to a maintained action. The gimbal was equipped with a protective jacket and a removable cage preventing access to the moving parts during the drilling phases was installed (Figure 10). If the cage is opened, a switch stops the rotation function
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CHARACTERISTICS OF FORESTS HYDRACORE
The standard unit includes a bracket, hydraulic motor, trolley, 106.7 cm (42 “) square mast, bearings with a garden hose inlet and hydraulic whisks.
Reinforced roller bearings and hydraulic motor.
Hydraulic power supply by WIPIN hydraulic unit or compatible power source.
Variable speed control.
Non inverter motor to protect the thread of the spindle.
Wheels for easy mobility.