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There are several different devices that can be used to attach objects to concrete, brick, and other masonry. One of the most common for small jobs, such as bathroom fixtures, is the rawl plug. Bawl Plug. The rawl plug can be used on any material that can be drilled. It is a simple arrangement consisting of a wood screw and a fiber jacket, specially treated for strength and durability. Drill a hole in the masonry, insert the jacket in the hole, and turn the screw in the jacket. The action of the threads of the screw causes the sides of the fiber jacket to expand against the sides of the hole. To fasten a fixture to a wall, using a rawl plug, it is first necessary to drill the holes. Mark the location of the holes on the wall and be very careful that the measurements are correct. Use a rawl twist drill. The size of the drill must correspond to the size of the rawl plug. If the drill is too large, the plug will not work effectively. Place the point of the drill on the mark and strike the drill lightly with a hammer. Rotate the drill by hand after each blow of the hammer; this will make the cutting action more effective. When the drill has penetrated the wall slightly, it can be held loosely, so that it jumps a little after each blow of the hammer. Remove the drill from time to time and blow any loose material from the hole. After the hole has been drilled to the required depth, the plug should be inserted. The plug must go deep enough so that the screw can be run in tightly after it has passed through the hole in the fixture to be attached. Put the screw through the hole in the fixture insert the tip in the plug, and turn the screw with a screwdriver until the fixture is tight against the wall. Expansion Shield. Expansion shields are used on masonry, and are made to take either a machine or wood screw. They can be used on heavy objects when a rawl plug would not provide enough strength. Though different brands of expansion shields vary in design, the basic principle of operation has two shields, internally threaded and hinged, which expand and take a firm grip on the sides of the hole as the screw is twisted down into them. The hole for these shields is made with a concrete, or star drill. This tool is not expensive and is well worth having in a tool kit. The drill is operated in the same manner as the rawl twist drill, striking it with a hammer and rotating it after each blow. Toggle Bolt. Attaching a fixture to a hollow tile wall or cement block wall can be a difficult matter unless the right type of bolt is used. For this task a rawl plug or expansion shield cannot be used, because the material is hollow and has relatively thin sides. Use a toggle bolt. The toggle bolt consists of a bolt, the nut of which contains a hinged wing. Drill a hole through the tile and pivot the wing so that it is parallel with the bolt. Insert the end of the bolt in the hole and allow the wing to swing down so that it is at a right angle to the bolt. Tighten the bolt and the wing will be pulled against the inside of the wall. Bolts in Concrete. A simple method of attaching bolts to a concrete floor is to drill holes in the concrete and insert bolts head down into the hole. After the bolt is in and centered, hot lead is poured in to anchor the bolt to the concrete. This method should only be used when there is no trace of moisture in the concrete and the operator takes the necessary precautions. Should there be the slightest trace of moisture in the concrete, the hot lead will turn the moisture into steam, and this will blow the hot lead out of the hole. When pouring the lead into the hole, stand well back so as not to be burned.
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Furniture
Home Construction
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