Rock Blasting

1. Introduction and General Information

This method statement provides the details of the materials, the equipment, the procedure and relevant documents related to the Rock Blasting activity, including the quality control verifications, the measurement verifications, and also the safety precautions to be implemented for this work.
1.1. Location of Works

The location of the rock blasting works will be limited to selected areas bound within the Right of Way (ROW).

2. Materials
The major materials used for the rock blasting works include, but are not limited to the following.
  • Explosive
  • Dynamite
  • Electric Detonators
  • Ammonium Nitrate
Other
  • Barricade Tapes
  • Warning Boards
  • Sand bags
  • Metal plate
3. Equipment
The major equipment used for rock drilling and blasting works include, but are not limited to the following.
  • Jack Hammers
  • Air Compressor
  • Circuit tester
  • Tamping rod
  • Siren
  • Tractor
  • JCB
  • Other minor tools
4 Man Power
Man Power used for rock drilling and blasting works include, but are not limited to the following.
  • Mining Engineer
  • Supervisor
  • Blasting Forman
  • Skilled labor – 02
  • Unskilled – 04.
5. Safety Management and Control

5.1 Control of Fly Rock
  • In the areas where the fly rock needs to be controlled, the charged boulders will be covered using a metal plate, used tyres and Sand Bags.
  • Drilling direction will be selected in accordance to avoid Fly Rock flying on to houses.
5.2 Warning Procedure to the Resident, Workers and Any Other Parties
  • Siren will be used before the blasting start.
  • Closing of all entrance before blasting.

6.0 Method and Procedures

Method and procedures for rock blasting works are as follows.

Before the commencement of the work, the Engineer will be notified of the areas where rocks are to be blasted. Accordingly, the Engineer will inspect the area for approval before commencement of the works.

6.1 Rock Drilling
Rock drilling will be carried out by jack hammer.
Hole depth less than or equal 1m, 1 hole /one boulder if boulder <2m3
Hole diameter: 32mm to 39mm
6.2 Blasting Rocks

6.2.1 General
Blasting will be executed in accordance with existing laws and regulations in Sri Lanka. Relevant permissions will be obtained from the designated authorities before work start.
Approval from the authorities will be obtained for storage of explosives. From our past experience, magazine houses have been required to be located inside nearest police station.
All blasting operations will be carried out under close supervision of the Mining Engineer, Safety officer. Only competent persons who have experience and knowledge in handling explosives will be appointed to take charge of the blasting operations at each blasting location. Explosives will be transport with police supervision.
6.2.2 Inspection and Joint Survey
Before the commencement of work a request will be made to the Engineer to conduct a joint survey and measurements of the rock which are to be blasted.

6.2.3 Charging:
Dynamite and Ammonium Nitrate will be used to charge holes.1m-depth hole will be charged with 40g of Dynamite and 150g of Ammonium Nitrate. Electric detonators will be used to initiate the primer.
Hole charging and initiation

  • Dynamite piece with a long Ignite Cord or leg wire will be carefully inserted down to the bottom of the hole.
  • Measured amount of Ammonium Nitrate will be then added.
  • Subsequently, the rest of the hole will gradually be filled with soil (particles not larger than 5mm) and slightly tamped with a lightweight timber or PVC pipe.
  • Protections will be introduced to control fly rock.
  • The Ignite cord will be curtailed allowing a length of 1 to 2m from the top of the hole.
  • Electric detonators all leg wires are series connected and will be fired using an exploder.

image 

Rock Drilling Using Jack Hammer

6.2.4 Firing Time and Number of Holes Per Time
Time :
Boulder blasting will be done between 10:00 hrs to 16:00 hrs in the week days except poya and public holidays.
Number of Holes Per Time :
Using Dynamite
A maximum of 25 holes per time
Using Electric Detonators
We anticipate firing a maximum of 200 blasts holes per time. This will be done as maximum 10 holes per 25-millisecond delay.
7 Quality Control
Several inspections and verifications will be carried out as described in the above method and procedures to ensure that the steps adopted are fully complied with during rock blasting as well as the all steps will be taken to fully compliance with the Environmental Method statement.
All blasting work will be done with the approvals of relevant authorities.

Comments

  1. UnknownJune 2, 2016 at 1:57 PM

    Any interest in Electronic detonators?

    ReplyDelete
  2. W m wijethungaAugust 11, 2019 at 3:14 PM

    I used rebar belts & send begs


    ReplyDelete
  3. W m wijethungaAugust 11, 2019 at 3:15 PM

    I used rebar belts & send begs


    ReplyDelete
  4. W m wijethungaAugust 11, 2019 at 3:16 PM

    I used rebar belts & send begs


    ReplyDelete
  5. ayden jamesonSeptember 19, 2019 at 11:43 AM

    Hi! I read your blog. Its so nice.EXPANDO is an expansive mortar chemical that cracks rocks and concrete. It is a concrete cutting, granite breaking and general demolition solution. This non-explosive demolition agent is easy to use, cost effective and a safer option for silently breaking up hard materials like rock or concrete. Simply drill, mix and pour.Non Explosive Demolition Agent

    ReplyDelete
  6. UnknownAugust 31, 2020 at 9:17 PM

    Pls send me chemicle blasting method statement

    ReplyDelete
  7. sandeepaDecember 21, 2020 at 10:02 AM

    Important

    ReplyDelete

Post a Comment

Popular Posts

Field Density Test

Image
  The sand cone method is used for field density test in our highway construction. In the field, the dry density test is carried out for check the compaction of layers. Compaction is most useful for the preparation of sub base grade and other pavement layers and in construction of embankment in order to increase the stability and to decrease settlement. In field compaction, the compacting moisture content is first controlled at optimum moisture content and the adequacy of rolling or compaction is controlled by checking the dry density achieved and comparing with the maximum dry density. Base layer-98% Sub base layer-98% Type 1 layer-95% ABC layer-100% Road shoulder- 98% Field density test Testing procedure: The weight of empty sand cone is measured and then filled with dry sand and weighted. The soil excavated from the hole is collected and weighted. After weighting, a specimen of soil is taken to determine it water content. The sand cone is placed on...
Read more

METHOD OF INTERNAL & EXTERNAL PLASTERING ON BRICK WALLS & CONCRETE SURFACES

Method of Plastering. Internal plastering on surfaces of brick and concrete. External wall plastering. Soffit plastering / Soffit finishing with cement based easy plaster material and wall putty. Improving joint of brick walls & structural concrete joints. Internal Plastering on surfaces of Brick and Concrete. Surface where plastering is to be done will be cleaned. Level pegs on walls will be fixed with reference to the off lines to brick walls set out in floors. (Using centre plumb bob and nylon thread). All the brick walls will be watered before pasting mortar on walls. First coat mortar filling (1:4 Cement and Sand) upto 15 mm will be applied on surfaces where required mortar thickness exceed 25mm. Walls and columns will be plastered 1:4 Cement and Sand to achieve semi rough finished surface. Vertical joint of structural columns / walls & brick walls will be treated by fixing 200mm width chicken mesh with wire nails / concre...
Read more

Method of Plastering

Image
Method of Plastering Internal plastering on surfaces of brick and concrete. External wall plastering. Soffit plastering / Soffit finishing with cement based easy plaster material and wall putty. Improving joint of brick walls & structural concrete joints. Internal Plastering on surfaces of Brick and Concrete Surface where plastering is to be done will be cleaned. Level pegs on walls will be fixed with reference to the off lines to brick walls set out in floors. (Using centre plumb bob and nylon thread). All the brick walls will be watered before pasting mortar on walls. First coat mortar filling (1:4 Cement and Sand) up to 15 mm will be applied on surfaces where required mortar thickness exceed 25mm. Walls and columns will be plastered 1:4 Cement and Sand to achieve semi rough finished surface. Vertical joint of structural columns / walls & brick walls will be treated by fixing 200mm width chicken mesh with wire na...
Read more

CRACK TREATMENT OF THE ASPHALT BINDER COURSE

Image
  Main Break Water(MBW) access road occurs several cracks on the asphalt binder course. The road cracks are monitored and investigated with specialist from RDA Research & Development. This report describes the reason and remedial method of the cracks based on the investigation and consultation. MBW access road structure consists of fallowing cross section and the core samples have been taken on the cracks. According to core sample data, can be observed that the crack was started from CBM and reflected to the binder course surface. CRACK INVESTIGATION The crack survey carried out for the entire road and investigation detail summarized as an attached sheet. Core samples were taken from the jointly selected locations with the engineer. MBW access road cracks were categorized into two types based on crack surface appearance. Transverse cracks Longitudinal cracks ...
Read more

Survey & levelling

Image
    Preliminary work in road construction is surveying & leveling works. This consists of Traverse Survey, TBM Survey, and Centre Line Setting out, Centre Line marking, Cross Section Survey and Submittal of Drawings. Traverse Survey At the commencement of contract all the basic traverse points will be checked and if any are found to be missing or appear to have been disturbed, necessary arrangements should be made to re-establish the points and traverse survey is carried out after that. Establishing TBMS We did not use survey Department bench marks .The permanent concrete cube was selected to permanent bench mark. It height was assumed hundred meters. But this point is not sufficient for construction purposes. So reference to this point Temporary bench marks (TBM) should be established. TBMs are used to transfer reduce levels in road construction. Temporary bench marks should be established at the rate of four per km and also at or near all structures. When e...
Read more