Explainer: The Different Types Of Ties Used When Building Scaffolding

A scaffold is a temporary structure put up during construction or repair of buildings to offer support to the crew in a work site as well as to support the materials to be used by workers. If you need aluminium scaffold hire Sydney then please check out Waco Kwikform.

In most cases, you will rarely find standalone scaffolding. To ensure that scaffolding remains stable, framework ties are usually typically fixed to the steelwork, building or any fabric that is adjacent to where the structure is being put up.

When building traditional scaffolding, the general norm is usually to fix a tie every 4 metres on alternate lifts. However, for pre-fabricated scaffolds, structural connections must be attached to all the frames. This means that placing ties at least every 2-3 metres when putting up prefabricated scaffolding. The manufacturer of pre-fabricated scaffolding usually provides instructions on how the pattern that the ties should be fixed. The ties should generally be placed as close as possible to the junction of the standard and node joint. Due to recent changes in regulations governing the construction industry, the ties used when putting up scaffolding must support the shear loads and butt loads.

Given that there are different types of structures, there are also several different types of ties that can be used when putting up scaffolding.

Types Of Ties That Can Be Used When Putting Up Scaffolds

  1. Through Ties

These are usually inserted through openings in a structure such as windows. A vertical inside tubing is usually put through an opening in the structure and then attached to the scaffold using a transom while a crossing horizontal tubing known as a bridle tube is placed on the outside. The gaps between these tubes and the surface of the adjacent structure are then usually packed with sections of timber to ensure that the scaffold is solidly stable.

  1. Box Ties

These are usually used to attach the scaffold to suitable support pillars. Two extra transoms are then usually placed across from the adjacent lift on either side of the scaffolding and then joined on both sides using shorter tubes that are known as tie tubes. If it is impossible to build a complete box tie, an I-shaped tie can be used to hook the scaffolding to the adjacent structure. To prevent the scaffolding from moving unsteadily inwards, a butt transom is usually firmly placed against the exterior wall of the adjacent building.

  1. Anchor Ties/Bolt Ties

Anchor ties can also be used when putting up scaffolding. These ties are typically fitted into holes that have been drilled into the adjacent structure. A good example of an anchor tie is a ring bolt that contains an expanding wedge which is usually then tied to a node joint.

  1. Reveal Ties

This is the least invasive type of tie that can be used when putting up scaffolding. Reveal ties are typically fitted into an opening within the structure through a tube that is wedged horizontally into the available opening. To ensure that a reveal tie is firmly held in place, a reveal screw pin (a threaded bar that can be adjusted) and protective packing is typically placed on either end of the tie. A transom tie tube is then used to connect the reveal tie to the scaffolding. Most professionals in the construction industry rarely use these ties when putting up scaffolding. This is because they need regular inspection and depend solely on friction to hold the scaffolding in place. When putting up a scaffold, it is recommended that you ensure that less than half of the ties used in the process are reveal ties. However, if you have no option but to rely on reveal ties, you can also ensure that you use a safe number of tie rakers. Tie rakers are single tubes that are usually fixed to a ledge that extends from the scaffold at an angle that does not exceed 75 degrees. The rakers should also be fixed firmly to the ledge. A transom is then placed on the base of the structure to form a triangle that reaches the base of the main scaffold.