Structural · S-RYZWJ

Construction Joint at Tower Crane Slab

Materials

Concrete

Elements

Columns Floors / Slabs Foundations / Footings Expansion / Control Joints Anchors / Embeds Reinforcing

Connections

Rebar Splice / Development

About this detail

A construction joint between a first and second pour in a tower crane mat slab foundation incorporates a continuous shear key formed with two-by lumber blocks, tapered and oiled, with the joint surface sandblasted. Connection across the cold joint is achieved using number ten by thirty-six inch T-head dowels spaced at twelve inches on center centered on the joint, supplemented by mechanical couplers and transition couplers as required. Top and bottom reinforcement continues through the joint per plan with specified lap lengths, while skin bars match the main mat foundation reinforcement along the sloped step. Future concrete column dowels and additional bars at hooks are positioned according to structural plans above optional pile locations.

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