Engineered demolition techniques for dilapidated structures

Engineered demolition techniques for dilapidated structures

1 Modern Demolition Techniques

·        Hydralic Rock Breakers

·        Diamond sawing and Drilling

 ·        Diamond wire sawing system

·        Silent expansive chemicals

·        Controlled Demolition

·        Hydralic Brusting / Spliting

·        Thermal lancing

·        Hydro demolition

·        Robolic demolition

·        Cor Drilling - uses diamond tipped bits with hydraulic/electric/pneumatic geode drill motors - maximum dia - 2000mm.

ü Wire Sawing : Ultimate Demolition Tool

In wire sawing a diamond beaded wire is reared around the RCC members, to be cut. The wire is rotated at a high speed (100Km/hr) by a special machine while constantly applying a pulling force. The diamond wire penetrates and cuts through the steel and concrete.

Water is used as a lubricating coolant. Wire sawing has limitations on the size of RCC member, to be cut. This technique is ideal for fast primary demolition.

ü Hand Sawing

Han sawing uses a light weight hand held machine, with diamond blade to cut RCC in any direction. By this technique, even over hand cutting is possible. Max. Depth of cut is 150mm.

Diamond Advantage

ü Time : Diamond tools cut concrete fast, reducing down time which Leeds to early project completion.

ü Limensional Tolerance: Diamond cutting is precise and controlled, little or no patching s required.

ü Structural Integrity : Diamond cutting allows removal of large amounts of concrete without damaging, remaining or surrounding structures.

ü Noise , Dust and Debris: Diamond cutting is relatively quiet and virtually dust free concrete pieces can be cut to specified size for easy removal.

ü Limited Access: Diamond cutting techniques can e used in confined areas and arrows existing equipment

Hydraulic Splitters/Busters:

Creates enormous sresses within concrete, producing tensile cracking of concrete.

Dismantling Tools

Hand Operated Machines

Crane Mounted machines

ü Special Machine

ü Robotic machine

Tools to be used for job on Haul

The following factors should determine the technique

ü Volume of  concrete to be dismantled

ü Space available for walling

ü Risks involved

ü Acceptable noise and Vibration levels

Hand Held Machines

ü Electrically Operated

ü Battery operated

ü Pneumatic

ü Hydraulic

ü Engine

Key Factors

General

ü Weight

ü Multifunction - Drill, Chip, Hammer Drill

ü Ergonomics

Technical

ü Energy Per Stroke

ü Material Removal Per minute

ü Tool Mount Type

ü Tool Life

ü Maintenance Cost

ü Safety Features

ü Durability

Advantages & Disadvantages of Hand Held Machines

Advantages

Easy to Handle

Unskilled labour can be used

Ideal for dismantling small volumes          

Ideal for short term jobs

Ideal for vibration less chipping.

Disadvantages    

Requires great inuscular power

Limited removal due to low hammer weight

Little impact from small diameter chisel

High labour cost

Harmful box due to vibrations.

Harmful to finger blood vessels

Danger from dust & falling debris