Bamboo as Scaffolding?

Did you know in the Far East such as India, Hong Kong and China uses bamboo as scaffolding material rather than steel and aluminium? For over 5000 years bamboo has played a significant role in the economic and cultural role of China. Even in Hong Kong today it is common to see bamboo scaffolding wrapping their modern glass and steel structures like a spider web. Not only is bamboo scaffolding durable and robust, it is also economical due to its cheap price and fast construction time. It is much more environmentally friendly than steel since it is a natural material, therefore it doesn’t cause pollution to product and could be disposed effectively through decomposition.

When workers start building they would initially build the scaffold around the site no matter how big or tall the building would be. Bamboo is significantly lighter than metal so no machineries are required to put up. At the end of the project builders will start from the top to dismantle the bamboo skeleton as they prepare to move to another job and recycle the bamboo. Unlike the modern western scaffolding which utilises metal couplers to hold the fittings together, bamboo scaffolding is held together using nylon straps tied into knots as couplers.

There is also something called “Bamboo Metal Hybrid Scaffolding” combining the best features of both components, having the robustness of bamboo with the reinforced safety of metal installations. Metal scaffolding is used in the early stages to build a strong foundation so workers can move equipment and materials around. Than bamboo is used to extend the existing structure to be cost effectively and at the same time it adds little additional weight thus putting less pressure on the foundation. As bamboo is easy to put-up, it gives the material the flexibility to adapt to the dynamic environment of a building site.

Bamboo is also used as a building material. In Japanese architecture, bamboo are often added as a decorative aspect to buildings such as gates, gutters, fountains, window, doors, since in the Far East there has a scarce amount of construction quality timber. In China bamboo has been used to build suspension bridges, bamboos are twisted together to create cables to strengthen the structure. Bamboo can be used as reinforcements to concrete in areas of abundant amount of bamboo, its effectiveness is questionable but it does have the strength to uphold this function. However untreated bamboo can swell from absorbing water from the concert and eventually cracking.

Lastly the Chinese believe bamboo possesses good Feng Shui properties providing the owner with good luck and wealth along with positive energy. I cant make the connection but if it is your cup of tea, go for it!

Scaffold Types

There are mainly two types of scaffolding available, Conventional and System.

Conventional Scaffold Tube, Boards & Fittings are more versatile in their use, but require a fair degree of skill to erect.  System Scaffolding is much easier to use and erect.

System Scaffold

The two main types of scaffolding systems sold and used in the UK are Kwikstage and Scaf-lok (similar system to “Cuplok”, designed by S.G.B., one of the world’s leading suppliers of access and formwork products).

 

Cuplok, or Scaf-lok, is a galvanised system that uses a “cup” and “blade” type to lock the various ledgers and standards together.

 

Kwikstage is the most commonly used system. The main difference to a Scaf-lok is that it comes painted in yellow and uses a “wedge” and “V-pressing” to locate and lock all components together.

Conventional Scaffold

 

 

The main types are:

  1. Independent scaffold
  2. Single pole or putlog scaffold
  3. Suspended (swingstage) scaffold
  4. Special scaffold

 

 

 

1. Independent scaffold

Independent Scaffolding

Independent Scaffolding

Independent scaffolds are ‘free standing’ but follow the same principal as putlog scaffolds. Putlogs are replaced with 5ft tubes and a row of standards and ledgers are erected on the inside as well as the outside to provide support, in addition diagonal braces are fitted between standards to give stability. The inside standards should be placed close to the building if the scaffold is for access to a work level.

 

The scaffold should be tied into the building at approx every other lift and every 20ft if at all possible, double couplers should be used for connecting ties, if no suitable reveals etc are available then Hilti Rings can be used.

Types of Independent Scaffold are:

 

Birdcage scaffold

A birdcage scaffold is an independent scaffold that consists of more than two rows of standards in both directions and is connected by ledgers and transoms. It is mainly used for work that is to be carried out on a single level, such as ceilings.

 

Tower scaffold

A tower scaffold is an independent scaffold consisting of four vertical members connected longitudinally and transversely

 

Mobile Scaffold

A mobile scaffold is an independent scaffold that is freestanding and mounted on castors

 

Hung scaffold

A hung scaffold is an independent scaffold that hangs from another structure, but is not capable of being raised or lowered when in use.

 

 

 

2. Single pole scaffold (Putlog Scaffold)

Putlog Scaffolding

Putlog Scaffolding

A single pole scaffold consists of a single row of standards connected by ledgers. Putlogs are fixed to the ledgers and built into the wall of the building or structure making it completely dependant upon the structure against which it is placed for support.

 

As well as putlog couplers there are also putlog tubes. These have a flattened end or have been fitted with a blade. This feature allows the end of the tube to be within or rest upon the brickwork of the structure. They can be called a bricklayer’s scaffold and as such consist only of a single row of standards with a single ledger, the putlogs are transoms – attached to the ledger at one end but integrated into the bricks at the other. Spacing is as general purpose scaffold and ties are still required

A slot is left between two bricks and the putlogs are located in this. The bricklayer will have left putlog holes every 4 – 5 ft, there should also be double holes left to allow for board joints say every 13 ft. Once the scaffold is dismantled the holes should be made good with mortar.

The advantage of a Putlog Scaffold is that less materials are used as there are no inside standards or ledgers. The disadvantage is that if the ground dries out and shrinks slightly, or a heavy load is placed on the scaffold then as the standards and ledgers drop they lever the brickwork apart!

 

 

 

3. Suspended (swingstage) scaffold

A suspended scaffold incorporates a suspended platform that is capable of being raised or lowered when in use. An example of a suspended scaffold is a swingstage scaffold. These types of scaffolds are commonly associated with the types window washers

 

 

 

4. Special scaffolds

Cantilever scaffold

 

A cantilever scaffold is a scaffold that is supported by cantilevered load-bearing members.

 

Hanging bracket scaffold

 

Other hanging bracket scaffold systems may include horizontal members that are supported by floors of buildings or other structures. An engineer should design the hanging bracket scaffold and its means of support. A safe means of access and exit should be provided for persons installing a hanging bracket scaffold.

 

Spur scaffold

 

A spur scaffold is a scaffold that is supported by inclined load-bearing 

members.