Presentation on theme: "Evaluate area for vertical shore placement and determine length for header and sole. Header and sole will utilize 12” O.H. for outside vertical posts and."— Presentation transcript:
Evaluate area for vertical shore placement and determine length for header and sole. Header and sole will utilize 12” O.H. for outside vertical posts and max spacing for vertical 4X4 = 4’, max spacing for vertical 6X6 = 5’. Take total height of void measurement for vertical posts by measuring in each projected location for the vertical posts. This will result in accurate measurements reflecting any height deviations due to inconsistencies in floor or ceiling. Use the shortest measurement as your total vertical height and subtract 8 ½” for each of the vertical posts to accommodate the header, sole, and 2X4 wedge packs. Cut the verticals, header and sole. Prefabricate the top half of the vertical shore if possible by measuring and marking the header for all the vertical post placements. Insure that the joints between header and vertical posts are square and have positive connections. Capture the joints between header and vertical posts by nailing half gussets with appropriate O.H. with 4 – 8d nails in header and 4 – 8d nails in vertical. Initially, capture one outside vertical and all intermediate verticals with gussets. Flip the tope half of the shore over and duplicate gusseting the opposite outside vertical. This should result in gussets on both sides of all of the intermediate verticals and single gussets on opposite sides of the outside verticals. Ex. A total void height of 8’ would receive vertical posts = 87 ½ “ (7’ 3 ½”). Utilizing 4X4 material and a three post vertical shore would result in 10’ header and sole. Application: Utilize this Class II shore as a vertical shore to support vertical loads. This shore is typically built in-place in the danger zone and should be preceded by spot shores. Maximum height for this shore is 12’ for 4X4 posts and 20’ for 6X6 posts and the Design Load is: 4X4 posts < 8’ = 8,000 lb. per post 4X4 posts 8’- 10’ = 5,000 lb. per post 4X4 posts 10’ – 12’ = 3,500 lb. per post 6X6 posts < 12’ = 10,000 lb. per post 6X6 posts 12’-16’ = 12,000 lb. per post 6X6 posts 16’-20’ = 7,500 lb. per post 12” 48” max. Vertical Shore If vertical measurements reveal height variables greater than 6” in 10’, sloped floor shores, spot shores, or crib boxes should be used. Changes less than 6” in 10’ may result in voids above the header which should be filled with shims.
A mid point brace is required for 4X4 vertical posts >8 and 6X6 vertical posts >12’. The midpoint brace may be 1X6 dimensional timber or ¾” X 6” plywood. The midpoint brace is only required on one side of the shore and should be nailed to each vertical post with 5 – 8d nails. Utilizing the plywood allows a more flush presentation of the diagonal bracing and eliminates the need to scab out for diagonal bracing. Ex. A vertical shore with three 9’ vertical posts spaced at 4’ would require a midpoint plywood brace that is ¾” X 6” X 8’. Vertical Shore
Once the top half of the shore is completed, set the sole plate in the desired placement for the shore. Measure and mark the sole plate with the locations for the vertical posts. Set 2X4 wedge packs on the vertical post positions on the sole plate. Stand the top half of the shore up, lift it into position, placing it on top of the wedge packs. Lightly pressurize and insure that the shore is plumb. Finish pressurizing. Capture the sole plate and vertical post joints with half gussets with 4 – 8d nails in the sole plate and 4 – 8d nails in the vertical posts. Insure that the outside vertical post and sole plate joint which is opposite the outside open header and vertical post joint is also left open or un- captured to accommodate diagonal bracing. This process should be completed on both sides of the shore. Vertical Shore
For diagonal bracing, utilize 2X6 dimensional timber on each side of the shore. Each timber should completely cover the outside joints. Each contact point on the diagonal bracing should receive 5 – 16d nails. 3 – 16d nails may be utilized on the ends of the diagonal bracing if nail space is too limited. Diagonal bracing should articulate in opposite directions on each side of the shore to form “X” bracing. Extremely long vertical shores utilizing multiple vertical posts may require multiple bays of diagonal “X” bracing. Vertical Shore