What is drilling and blasting in construction?
What is drilling and blasting in construction?
Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The result of rock blasting is often known as a rock cut.
What is specific charge in blasting?
Specific charge is defined as the amount of explosives required for blasting a unit mass of rock and can be described by the following equation: where q is the specific charge in kg/t, is the amount of explosive consumption in kg, and is the amount of rock blasted in t.
What is blasting in construction?
blasting, process of reducing a solid body, such as rock, to fragments by using an explosive. Conventional blasting operations include (1) drilling holes, (2) placing a charge and detonator in each hole, (3) detonating the charge, and (4) clearing away the broken material.
How is blasting powder factor calculated?
Calculating Powder Factors Or, alternatively, it can be the amount of explosives required to break a unit measure of rock. Since rock is usually measured in pounds, there are several possible combinations that can express the powder factor. Powder Factor = Tons of rock (or cubic yards) per pounds of explosive.
Is code for drilling and blasting?
IS 4081
IS 4081: Safety code for blasting and related drilling operations.
How many types of blasting are there?
There are various types of abrasive blasting including, silicon dioxide, soda, steel, bristle, glass bead and much more. All these different abrasive blasting methods usually use a specific type of grit to achieve the desired results, hence the need to determine the correct technique to use.
What does a drill and blast engineer do?
Role responsibilities will include drill and blast design and planning activities for mining operations, ensuring the safe and efficient delivery in accordance with mine plans. Create effective drill pattern, electronic initiation and charging designs. Explore new ways to increase drill and blast productivity.
What is the K factor in blasting?
K-factor – A scaling factor correlating the distance (D) and Net Explosive Weight (W) with a particular peak incident overpressure based on the Kingery-Bulmash relationship, as shown in Figure 1.
What Are blast parameters?
The parameters to be considered for blast casting are the overburden rock characteristics, blast geometry, spacing to burden ratio, delay interval, stemming and decking, Page 16 8 bench height to width ratio, explosive used etc.
Is Sand blasting allowed in India?
The Cons of Sandblasting Are as follows: Therefore, if use that on the regular for a particular surface preparation, them it would wear away the surface of the particulars. Use of silica: it has been banned in most of the countries including India, because of its different health hazards.
Is code for sand blasting?
HS Codes 84243000 : HS Classifcations of Steam or sand blasting machines and similar jet projecting machines.
What is B blasting?
Bead blasting is a flexible, multi-purpose surface finish that involves shooting high-pressure glass or steel beads at a CNC machined component. A bead blast finish can clean your part’s surface and improve the overall appearance, creating a uniform surface with a dull, satin, or rough texture.