Anchor Bolt

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

  1. Cast in place anchor bolt
  2. Wedge bolts
  3. Strike bolts
  4. Lag shield bolts
  5. 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.

Wedge Bolts

  • They are also called as expansion bolts or expansion anchors.
  • These bolts are preferred for interior applications.

Strike Bolts

  • 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.

Sleeve bolts

  • 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

  • Construction
  • Ship-building
  • Dams
  • Reservoirs
  • Nuclear plants
  • Gym equipment

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