Blindside Concrete Wall Forming

New concrete wall sometimes must be placed against existing concrete walls earth banks or shoring.

Blindside concrete wall forming. Manufacturers provide specialty form accessories. Steel dog offers the most comprehensive line of one sided and blind side forming hardware. A number of specialty accessories are available to make the job easier and prevent bulging walls. According to kidder parker architects and builders handbook the first blindside membranes were multiple layers of burlap or felt swabbed with hot pitch or asphalt applied over the drainage tile and covered with bricks.

Without ties one sided wall forming can lead to bulges and blow outs. Even with blind side wall applications the vibrator operator can look down the backside of the stay form and see when the concrete paste blossoms through the form to cover the face of the form. When forming against a preexisting foundation wall if space allows there is a possibility that two sided forms can be used. Fiberglass form ties effortless installation no rust heavy duty.

If you do not have the luxury or room to strip formwork stay form is the right product for the job. A frame steel channel waler. Tie almost any handset form system to almost any existing wall or structure. If the waler assembly and the forms are lifted separately a waler connection positive connection is not necessary.

Blind side and one sided forming by bruce a. The symons stay form hook ties were spaced 24 on center horizontally and 12 on center vertically for the 16 high 12 14 thick walls. At this point one can be reasonably assured that the concrete has been properly consolidated. Note the slits placed in the stay form to allow the installation of the hook tie.

When a contractor has to form a concrete wall within a few inches of an existing structure stay form is an excellent product. The assembled ganged formed blind side wall panel before it was lifted to a vertical position. Concrete was a rare material at that time but had already started to make its way into the foundation wall. These one sided wall forming components are designed to fit the 5 or 8 walers used with most forming systems.

The blind side or the back side between the old and new wall can be formed with instruments similar to those used for one sided forming. Here workers are removing concrete and adding braces to stop the form from moving. Voltex waterproofing was applied to the stay form. By utilizing stay form with rebar studs hook ties and a modular form system a one sided form or blindside wall can be constructed.

This is a view of the backwall of the wall panel prior to the concrete pour. Such situations require the use of one sided forms and special attention to bracing or tying. However some of the systems require the use of a sill 1 to position and connect walers to formwork as an assembly.