American Plywood in Roof Construction: A Design Guide (BRE by Peter Bonfield

February 23, 2017 | Construction | By admin | 0 Comments

By Peter Bonfield

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8. Check all hose connections and make sure that a pressure gauge is installed and functioning. 9. The pump and jack should be started and checked in both extended and retracted positions. Are they any hydraulic leaks? Is the seating plunger functioning properly? Stressing the Tendons 1. Although stressing should not commence until the proper design strength of the concrete has been achieved, it is advisable to begin stressing as soon as design strength is verified. 2. A safe, clear area must be created for the stressing crew.

4. When stressing above grade, jacks and pumps need to be secured to a fixed object to prevent equipment from being thrown off the elevated platform should a tendon fail during stressing. 5. The pump should be operated by a pendant switch, which will allow the operator to stand away from the pump should a tendon or jack gripper fail. 48 Section 1 The Don’ts of Stressing 1. Don’t stress any tendons that contain concrete slurry inside the anchor cavity. The slurry will prevent proper seating of the wedges.

Don’t allow obstructions in the path of the jack extension. 5. Don’t use extension cords longer than 100 feet (30 meters). All extension cords must be three wire, 12 gauge, minimum. 6. Don’t continue stressing if it appears that something is not working properly. 7. Don’t detension with loose plates, spacing shims, or piggy backing. 8. Don’t stand close to the jack or between the jack and the pump while in operation. 9. Don’t permit workers to stand in the immediate area of the jack. 10. If unsure of any operation or procedure—STOP and get professional instructions.

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