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Taper Tie

Taper tie systems provide the most cost effective means of gang forming structures by being 100% reusable and only requiring a one time assembly of the large plate washer and wing nut before they can be installed into formworks. A contractor begins by threading the large wing nut and sliding plate washer on to taper tie. By knowing the wall thickness to be cast and the dimensions of the formwork, the large wing nut will be set to a specific distance on the threads to ensure the maximum amount of the large taper is cast in the wall. The large wing nut should never have to be turned or removed from the tie throughout the remainder of the project unless a wall thickness is changed. The next step is to install the taper ties into the formwork when both wall panels are set. Push the taper ties in so the plate and washer hit the back of the form and then install the small plate and wing nut. After the concrete has been poured and the wall can sufficiently support it own weight, stripping the forms are easy. Remove the small wing nut and plate washer, hit with an 8 lb mall, and remove the tie. The small wing nuts and plates can be fastened with wire to the back of the form by each tie hole for easy placement for the next pour.

She-bolt

She bolt systems are time consuming and cumbersome and can take up to 50% longer to assemble and increased time to install into the formwork. With many parts to assemble, and the use of sacrificial inner coil rods and water stop washers for each pour, material costs and man hours increase before a contractor makes the very first pour. After the time consuming assembly, she bolts can be installed in two manners, one by inserting fully assembled she bolt into formworks after wall panels are set or inserting a half assembled she bolt with coil rod threaded in from one side then threading the other she bolt tip to coil rod from opposite side. The second practice can be difficult and time consuming aligning threads to secure inner coil rod. Unlike taper tie systems, production is decreased when stripping forms. Stripping she-bolts from the forms requires multiple steps by unthreading the tapered she bolt tips off inner coil rod from each side to remove forms. Having multiple parts to keep track of and without the ability to wire parts off to forms for future use only decreases production efficiency. After an initial pour the formwork tie holes will need to be cleaned of concrete cream to allow the she bolt to be inserted through wall panels again, a step that is eliminated when using a taper tie system. Then the task of reassembling each she bolt for the next pour. She bolts rely solely on a single neoprene washer attached to the inner coil rod cast into structure for water stop purposes. Added steps are taken to ensure a watertight product, the inner coil rod that has been cast in the wall should be cleaned, painted with epoxy and dry packed to seal the void. Even the slightest leak or exposure to liquids and the inner coil rod can corrode and as data shows begin to expand up to 12 times its mass, creating voids for leaks to begin. Having the cast in place coil rod limits the options to repair failures to expensive epoxy injections and waterproof coatings. These steps can lead to a lower quality product and the overall cost of building a watertight structure.