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Anchors

1-11. Anchors

Fastening wood or other materials to concrete or other materials has always been a task for carpenter's. Anchors (fasteners) for such work can be divided into three general categories. The first group includes anchors installed during the initial construction. The second group includes anchors installed in solid concrete or masonry after construction is completed. The third group includes anchors installed in masonry, plastic, or drywall that has a hollow space behind it.

a. Anchor Bolts. Anchor bolts (Figure 1-43) a used to fasten sills to masonry foundations. These bolts are used to fasten the sill to the footers. Anchor bolts are installed when placing the footer while the concrete is still wet.

Figure 1-43. Anchor bolt installation

b. Expansion Anchor Bolts. Lead screws, plastic anchors, and lag expansion shields all work with the same basic idea. Drill a proper size hole and insert the expansion shield into the hole. The insertion of the screw or lag bolt expands the fastener to provide a secure hold. Figure 1-44 shows how expansion anchors work.

Figure 1-44. Expansion anchor bolt

c. Molly Universal-Screw Anchors. Molly fasteners (Figure 1-45) provide a solid means of attaching fixtures to interior walls. A hole is drilled the same size as that of the outside diameter of the fastener. These fasteners are designed to expand behind the wall covering.

Figure 1-45. Molly universal screw anchors

Curriculum design: David L. Heiserman
Publisher: SweetHaven Publishing Services