Safety, Speed, and Support The core used PERI VARIO formwork to cast the concrete pour around the tower crane, carried by PERI ACS Core 400 self-climbing formwork system. ACS Core 400 was selected for its hydraulic controls that allow for climbing all four cells together and climbing the core from pour to pour. VARIO is highly adaptable with freely selectable tie positioning and joint arrangement in accordance with planning specifications that delivers freedom in wall and tie design. It is continuously adjustable through the elongated holes in the walers and couplings with flush, aligned, and tight panel connections, making it the optimal formwork solution for Salesforce Tower. The ACS Core 400 was designed for the US high-rise market, featuring a high-capacity single stroke cylinder that climbs to the next level in 20 minutes with less brackets, anchors, and over parts required. ACS Core 400 can support large concrete placing booms that allow for pouring slabs and walls simultaneously. From ground level to level 40, crews utilized a four-core cell before transitioning to a two-core cell for levels 40 and up. The external panels of the ACS Core 400 system provided safe and comfortable work access while also supporting the load-bearing capacity of additional materials, supplies, and tools, including 100,000 pounds of rebar. This added support and platform space was particularly important since materials could only be delivered once a day. In addition to the core cells, MULTIPROP vertical shoring was utilized for framing large door box outs for walking into the elevator lobbies and holding up horizontal shoring. The aluminum MULTIPROP weighs less and carries significantly higher loads than tubular steel slab props. MULTIPROP features a practical wedge connection and an integrated measuring tape on the inner tube to quickly show the complete length of the prop, delivering both time and cost savings. Open for Business Proposals for the project began in February 2020, and the first product delivery was in August 2020. PERI provided continuous engineering support for construction management during the entire execution phase, with numerous revisions to the structure from top to bottom. Construction on Salesforce Tower is expected to be complete in December 2021.
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November 2021 csengineermag.com
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