Introduction of anchor Bolt
- Base plates and anchor rods are often the last structural steel items to be designed but the first items required on the jobsite.
- Anchors to appear in concrete drawings with location of each anchor in x and y direction.
- Pedestal should be designed to suit the supporting column and anchors.
- An anchor bolt functions to joins an object to concrete.
- Vast majority of column base plate connections are designed for axial compression with little or no uplift.
- A bolt is a threaded fastener.
- Critical to provide well-defined, adequate load path when tension and shear loading will be transferred through anchor rods.
- They are manufactured with an external thread at its end, used for insertion through holes in already constructed parts and are tightened by a nut.
Base plate materials
- Base plates should be ASTM A36 material unless other grade is available.
- Most base plates are designed as to match the pedestal shape.
- A thicker base plate is more economical than a thinner base plate with additional stiffeners or other reinforcements.
Types of Anchor Bolts
- Cast in place anchor bolt
- Wedge bolts
- Strike bolts
- Lag shield bolts
- Sleeve bolts
Cast in place anchor bolt
- Cost-in-place anchor bolts are quickly becoming a more commonly used fastener.
- Cast-in-place anchors are a good solution for most projects.
- They are placed before the setting of concrete.
- The concrete foundation of a building is connected to its wall by using Anchor bolts.
- It’s not uncommon to miss wall locations which cause project delays. Engineers and general contractors have to design an alternative solution that meets the required load values.
- They are also called as expansion bolts or expansion anchors.
- These bolts are preferred for interior applications.
- These bolts are preferred for solid, concrete projects with medium or heavy load.
Lag shield bolts
- These bolts can be used to anchor across different materials i.e. brick, stones and blocks to hold both dead weight and vibrating loads.
- They are medium duty anchors used with a lag bolt.
- These bolts are heavy duty anchors, they do not require solid base material for installation.
- They are commonly used in brick, stone and concrete.
Applications of Anchor Bolts
- Nuclear plants
- Gym equipment