What are Holding Down Bolts?
In construction and structural engineering, the right choice of bolts can make a significant difference in the longevity and stability of a structure. Among the range of options, holding down bolts stand out for their specific use and distinctive appearance. In this blog, we will take a look into what Holding Down Bolt Assemblies are, why they are used and how they differ from regular bolts.
Understanding Holding Down Bolts
Holding down bolts, also known as foundation bolts, are integral to securing steel structures to concrete foundations. At Speedy Fixings, you’re able to choose Holding Down Bolt Assemblies which includes everything you need for a quality, functional fastener.
Unlike smaller bolts, such as concrete bolts and hook bolts that serve various general purposes in construction, holding down bolts are specifically designed for heavy-duty anchoring. Their application is critical in ensuring the structural integrity of buildings, bridges, and other infrastructure, where a strong bond between the foundation and the structure is essential.
As well as supplying the individual components, Speedy Fixings sell holding down bolt sets are supplied in grade 8.8 high tensile steel and conform to BS 7419, offering superior strength and durability. Available in both galvanized steel and stainless steel for up to sizes M72, these bolts cater to a wide range of requirements, ensuring versatility in use. Furthermore, we provide bespoke bolt cluster ‘cages’ tailored to our customers’ specifications.
Is the Installation Process Difficult?
The installation process is designed for precision and ease. The set includes a bolt in high tensile steel, accompanied by a nut and round washer, a square hole plate washer, and a tapered waxed cardboard cone. These parts are then cast into the concrete pad.
Typically, four foundation bolts are utilised to anchor each baseplate securely. Concrete is then carefully poured around waxed cardboard cones, facilitating lateral movement of the bolts and making the alignment of the above-ground structure much easier. After the steel frame is precisely positioned, the foundation bolts are securely grouted in place. However, if this isn’t quite right, vertical adjustments can be made by utilising packers and shims between the baseplate and the concrete foundation.
What Are the Main Components of Holding Down Bolt Sets?
At Speedy Fixings, we provide our customers with high quality Holding Down Bolt Sets. Each part of the assembly is important, but what are the main components that come with these sets, and what are they for?
- Square Hole Plate Washers: These washers play a crucial role in preventing the rotation and pulling out of the holding down bolt when tightening. Their design ensures the bolt stays anchored, maintaining the stability of the structure.
- Tapered Waxed Cones: These waxed cardboard cones are placed over the bolt, standing on the plate washer. The cone remains in place while the concrete sets, allowing for lateral, circular movement of the bolt. This flexibility is paramount in aligning the above-ground structure, simplifying the construction process.
- Square/Square Holding Down Bolts: Exclusively designed for anchoring structural steelwork to concrete flooring or foundations, these bolts are the backbone of any structure they secure. Their robust design ensures a steadfast connection between the foundation and the structure, a testament to their engineering.
In comparison to other standard bolts, holding down bolts are made for a crucial role in maintaining the structural integrity of your project. With Speedy Fixings, customers have access to top-quality holding down bolt assemblies as well as our expertise and bespoke solutions needed to tackle any construction challenge.