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1190 R. C. xENMIR JunnAWWA <br />is advisable to use a waterstop with a <br />center bulb having an inside diameter <br />of at least } in. Unless waterstops are <br />held firmly in position when the con- <br />crete is placed, they may become so <br />badly displaced as to render them com- <br />pletely ineffective. In the case of a <br />vertical wall joint, the concrete, as <br />placed, may cause the waterstop to <br />fold back against the form bulkhead. <br />:11-in.X64n Plates <br />•in. Neoprene Closed <br />all Sponge Cemented <br />to Plate (ryp.) <br />N� <br />•� In. lg in. _ih: High Tensile garsWith Opposite <br />Threaded Ends Bars Coated With <br />T'a-in. Neoprene (Ultimate Tensile <br />. strength of 145,000 psi) <br />terstops. It has been the author'; <br />practice to omit waterstops in hori. <br />zontal Mints only if the water depth <br />above the joint does not exceed about <br />12 ft. <br />Either flatstrip or multirib rubber <br />or plastic waterstops are used in reser- <br />voir floors as illustrated in Fig. 12, but <br />usually only the flatstrip type is used <br />in roofs. If differential movement is <br />Main Schad. 40 PVC Pipe Sleeves Filled With Grease <br />Gray Polyurethane Sealant <br />/Neoprene Closed Cell Sponge <br />y-in. Gap vl-in. Diam. Ached. 40 PVC Pipe, <br />Sleeves Filled With Grease <br />Drilled and Tapped <br />Holes far A -in. Bars <br />• Section A —A <br />Fig. 8. Expansion Joint for Concrete Roof in Which Tension Ties Are Provided Across <br />the Joint in Roof That Serves as Tension Member Between opposite Walls <br />This can be prevented by holding the <br />waterstops in position by attaching <br />light tie wires to the edge of the water - <br />stop spaced at about 18-in. centers and <br />tied to the two curtains of reinforcing <br />steel. It is considered good practice <br />to use similar waterstops in horizontal <br />wall joints, as illustrated in Fig. 11, <br />but if good construction methods can <br />be assured, satisfactory horizontal <br />joints can be constructed without wa- <br />expected at any of the floor joints, it <br />is advisable to use a bulb -type water - <br />stop or a multirib waterstop, which is <br />designed for differential movement. <br />All intersections of waterstops should <br />be bonded by vulcanizing in the case <br />of rubber or by heating with a' hot <br />knife or other device in the case of <br />plastic. Waterstops in the floor joints <br />should be bonded to the waterstops in <br />the wall footing, and those in the roof <br />RICHARD BRADY &ASSOCIATES, INC. F-59 <br />25B-137 <br />