Common misconceptions about demolition

posted in: General 2

Common misconceptions about demolition

What is demolition?

Demolition derived from the verb demolish: to completely destroy a building, especially in order to use the land for something else.

When I think of demolition, I think of buildings collapsing, loud bangs, big machines, and building areas being closed off. Due to demolition becoming very messy.

I have to admit I didn’t know much about demolition, especially since most of the sites are usually covered up when you go by, but I have to say thanks to Google. As I have learnt that there is a lot that goes into demolition and behind the scenes. I even learnt what demolition is.

“Though demolition is an important part of the life of our cities and neighbourhoods” – Demolition 101

When it comes to demolishing a building it is not as easy as one, two, three. There are many factors that come into play, e.g.: Professional machine operators, proper equipment, and the most important of them all a plan.

 

1. Buildings don’t just fall, and implosions are just one percent of demolition work. Machinery such as excavators and backhoes do most of the work.

2. Demolition contractors help preserve and restore historical buildings.

3.  The personnel using the machinery need to undergo the proper training on how to use the equipment the right way. Especially since we all know that technology is constantly evolving, so the machine operators need constant training to keep up with the changes.

4. Contractors do not just knock buildings down for fun. It’s their job.

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I am a content researcher who just started with Leads 2 Business in February this year, I work in the Daily Tenders South Africa department. I am a young vibrant lady who enjoys meeting new people and doing new things. I welcome challenges and always find new ways of doing things. I am a mum and I love spending time with my not so little, very talkative son.

Demolition Techniques

Demolition Techniques
You may assume demolition is simply blowing things up. Some involve explosions but it is however way more technical than that. There are various demolition techniques that are considered as ‘demolition’.

 

It must be noted that before any demolition takes place the following practices need to be completed according to The Constructor

1. Surveying
2. Removal of hazardous materials
3. Preparation of plan
4. Safety measures

 

Taking the above into account the following (according to Civil Engineering News) are selected.

1. Non Engineering Demolition also known as Manual.

a) Refering to tools such as Sledge Hammers, Jack Hammers and Drillers which are used by workers.

Jackhammer - Demolition Techniques.jpg
Jackhammer Technique

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Engineering Demolition which is split into 3 categories.

a) Mechanical Method:

Wrecking Ball (think Miley Cyrus but without the theatrics)

Pusher Arm technique (a specialised hydraulic arm used for smaller buildings)

Thermic Lance Technique (using flaming temperatures of 2500 0C to melt reinforcement)

Non-Explosive (drilling and filling with expanding slurry)

Concrete Sawing

Deliberate Collapse (significant structural items are removed)

Pressure Jetting (thanks to H20)

 

b) Implosion: Inward disintegration using explosives

c) Deconstruction: Non-structural and structural

Wrecking Ball - Demolition Techniques.jpg
Wrecking Ball Technique

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Demolition encompasses many techniques and is often used in conjunction with new construction or renovation.

In conclusion, I’ll take inspiration from Rumi, ‘In this life many demolitions are actually renovations.’

 

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Industry Events: Key Principles of Tendering Workshop and Global Trade Show

Industry Events: Key Principles of Tendering Workshop and Global Trade Show

Construction Events

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Key Principles of Tendering: Workshop

Date:

25 to 26 July 2018

Event location:

Johannesburg

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South Africa’s premier masterclass on how to submit compliant and winning tenders. This workshop has now been presented to more than 2,000 delegates and with the on-going changes in the tendering legislation companies are advised to continue to align, not only their bids but also their sub-contracting processes with these regulations.

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Global Trade Show

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Gallagher Convention Centre, Midrand, Johannesburg

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Why do buildings get demolished?

posted in: General 0

Why do buildings get demolished?

Why do some aging, often sizable buildings in cities and suburbs face demolition while others are saved?

What determines the life span of a building? Whether a shopping center, a school or library, an apartment, an office building or a government administrative office?

What does the word ‘demolition’ mean?

I think we can safely say that it is the complete elimination of all parts of a building at a specific location and time – typically it is the end of life for the building.
It is interesting to note that partial demolition begins during the life cycle of buildings as maintenance and adaptation including the replacement of building parts result in a size-able waste factor.
Over a very long life-span the waste factor has been known to exceed demolition waste.


Here are the top reasons why buildings get demolished:

The structure and form of the building is outdated or old. Some buildings are unsafe due to lack of building control. While some problems are fixable, it is often too costly to repair an unstable foundation.

Political transformation processes are often accompanied by destruction and demolition such as the demolition of certain monuments in South Africa as they represented a certain era in South African history that are no longer popular today.

The function of a building for example a building becoming obsolete IE it can no longer perform its function because increased physical deterioration has rendered it useless.

The costs of renewing the infrastructure (streets, sewage, green space, etc.) resulting in developers favoring replacement after demolition instead of renovation

The application of building codes and regulations to existing buildings for example “green space”. This often entails expensive alterations which can make compliance through demolition and rebuilding a cheaper or more profitable option.

Plans to sell a vacant plot especially if the building on it is not in a good condition.

The Building contains dangerous materials. Older buildings may contain enough dangerous materials, such as asbestos, that require full or partial demolition


Sources:
www.simcatgroup,com.au
www.realtreeinc.com
www.grantmackaydemolition.com
www.washingtonpost.com

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Construction of a cement grinding plant in the Coega Industrial Zone

Kathu Solar Park

Description
Construction of a cement grinding plant in the Coega Industrial Zone, Nelson Mandela Bay Municipality, Eastern Cape. The cement grinding facility will be located along Neptune Road within Zone 5 of the Coega Industrial Zone which is 6km east of the town Motherwell, Port Elizabeth. Estimated value: R350 million

 

Status Region
Underway Eastern Cape
Category Value
Building R350 Million
Industry Timing
Industrial August 2017 to August 2018
Sector Class
Private Invited / Negotiated

 

cement grinding plant

 

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Featured Tender: Appointment of three(3) Qualified Electrical Contractors for Emergency Work

Appointment of three(3) Qualified Electrical Contractors for Emergency Work on the KSDLM Overhead and Underground Electrical Network at Various Locations within KSDLM

Qualified Electrical Contractors

Contract Number:

SCM:002/2018/19 – king Sabata Dalindyebo Local Municipality

Description:

Appointment of three(3) Qualified Electrical Contractors for Emergency Work on the KSDLM Overhead and Underground Electrical Network at Various Locations within KSDLM

 

Category Industry
Electrical & Instrumentation Institutional
Region Site Inspection
Eastern Cape 2018-07-20 10:30 AM
Closing Date Contract Period
15 August 2018 at 12:00 No Details

 

 

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Tips for Blasting

Tips for Blasting
Blasting

Firstly we need to know what blasting is. It is a technically controlled, effective and safe way to break rock for excavation. It is primarily used in Civil Engineering, Mining and Quarrying for roads and dam construction.

What explosives are used for blasting?

It is a common misconception that dynamite or gunpowder are used for most blasting activities but it is rather the engineered blasting agents that account for approximately 90% of explosive material used.
Ammonium Nitrate mixed with either sodium nitrate or calcium nitrate is the most common product and pound for pound the more effective explosive.

 

What is involved in Blasting?

• Holes are drilled into the rock and filled with explosives. The more solid the rock the more explosives will be needed.
• Proper ventilation is required to remove not only the dust but also the combustion gases from the explosion. This needs to be done before work can be resumed.
• The rock then collapses once detonation takes place.
• The debris is removed and if need be reinforcing is put in place before further work takes place.
• The entire blast lasts up to 1 second.

Blasting

Steps to be considered before blasting takes place:

• Fragmentation desired – take into consideration size of digging equipment and crushing equipment needed on the project.
• Rock quality/character – state of the area being blasted, is the rock hard or soft and is the area dry or wet.
• Site limitations – is the area to be blasted near other structures or properties.
• Safety limitations – are there any electrical hazards
• Equipment limitations – are all equipment needed for the project available

 

Random facts about blasting

• Blasting is now considered routine work in the mining industry.
• Geological or Geotechnical knowledge is needed to ensure effectiveness and safety.
• Blasting involves design and patterns, not just “blowing” stuff up…
• The result of rock blasting is often called rock cut.
• Mining and Construction are the 2 most common uses for explosives.

Blasting

 

Sources:
www.wikipedia.org/wiki
www.railsystem.net
www.miningandblasting.wordpress.com

 

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Industry Events: Affordable Housing Africa, Smart Procurement World Kwa-Zulu Natal Conference & Expo and Power Gen & DistribuTech Africa

Industry Events: Affordable Housing Africa, Smart Procurement World Kwa-Zulu Natal Conference & Expo and Power Gen & DistribuTech Africa

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Affordable Housing Africa

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16 to 18 July 2018

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This highly-interactive and information packed event will highlight case studies from some of the finest and at the same time provide an excellent networking platform for the public and private sectors, global professionals and industry leaders who are all directly involved with the growth and development of affordable housing, enabling Africa to take itself to the next stage of development.

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E-mail: MaheswariG@marcusevanskl.com

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Smart Procurement World Kwa-Zulu Natal Conference & Expo

Date:

17 to 19 July 2018

Event location:

Durban ICC, Durban

Event Description:

The conference will examine finer procurement and supply chain innovations compatible with organisational goals and policies.

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E-mail: debbiet@smartprocurement.net

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Event Details:

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About Sasha Anderson

Millennial Mom + wife living the hash-tag life. Remember: If You Fail - Fail Forward

Top Demolition Projects

Top Demolition Projects

When it comes to tearing things down, you need to make absolutely sure, that you never ever need or want to see that thing again… Let’s say, a building…

Demolishing a building may come with good reason, like a condemned building or just an unsafe environment all round.

I am 100% sure nobody ever wants anything in life to go wrong, but, just like anything in life, demolishing a building can be very unpredictable.

A lot can go wrong, even with the most meticulous planning. So much needs to be taken into account when planning to demolish a building.
Even more so if the least amount of damage to the surrounding area and the people involved is a concern.

Just like in rugby, because of the shape of the ball, it can go in the complete opposite direction than is planned. And might just cost you the game.

With this in mind, should it all blow up in the wrong direction, it would probably cost you much more than anticipated. And in some cases damage to someone else’s home and/or work.
This will then also lead to months of unnecessary construction work and relocation of people and/or companies.

Wasting time and money, does not bode well for the future of a company.

So, let us take a look at a disastrous outcome for a demolition project:

 

And since I would not like to leave you with that sour taste in your mouth, here are some adventurously, successful demolition projects:

 

Here we can see that some well-planned demolition projects can look absolutely stunning.
It comes with extreme precision, when planning such projects.

We have to keep in mind that where there is demolition in process, there will soon be something more modern and safe built in its place.
It goes to show that in life, we have to take the bad with the Good.

May this give you hope that not all things being demolished end disastrously.

 

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Featured Project: Hotel and Convention Centre, Swaziland

Hotel and Convention Centre, Swaziland

Hotel and Convention Centre, Swaziland

Description:

Construction of a five star International Hotel and Convention Centre at Ezulwini in Swaziland. No official name has been given to the new Ezulwini complex, but it is being referred to by planners as the King Mswati III Hotel and Convention Centre. Estimated project value : E1 billion.

Hotel and Convention Centre, Swaziland

Status:

Underway

Category:

Building

Industry:

Hospitality & Leisure

Sector:

Public

Region:

Swaziland

Value:

R100 Million+

Timing:

May 2015 – October 2018.

Class

Open Tender

 

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One girl who would rather wear boots than high heels...

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