This session will be of interest to design engineers, contractors, formwork engineers and manufacturers, and others interested in concrete formwork construction practices. Attendees will have the opportunity to learn from design and construction formwork successes as well as unsuccessful projects and learn about the various types of formwork, formwork economics, formwork troubleshooting, tolerances, and safety issues during formwork operations. Be sure to attend this session to learn about the various types of forming systems.
(1) Describe how to economize on formwork (considering that the cost of formwork is approximately 35% to 60% of the concrete cost);
(2) Examine construction tolerances relating to formwork installation;
(3) Identify possible ways that forming operations can go wrong;
(4) Summarize construction pitfalls and how to avoid them.
This session has been approved by AIA and ICC for 2 PDHs (0.2 CEUs). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.
What Contractors and Engineers Should Know About Shoring and Reshoring Sequencing
Presented By: Mary Bordner-Tanck
Affiliation: Bordner Engineering Services, LLC
Description: The removal sequencing of shoring and reshoring can have a significant impact on the construction schedule as well as the structure itself. This presentation will cover basic sequencing and focus on commonly encountered construction issues that can affect the removal of shoring and reshoring. This presentation will also cover some methods for addressing those common issues.
Tall Tree Column Formwork Challenge at St. Regis Highrise, Chicago
Presented By: Eamonn Connolly
Affiliation: James McHugh Construction Co.
Description: Tall, complex and leaning; the four 43-foot-tall sloping column showpieces at the VSt. Regis Highrise in Chicago challenged field teams, formwork suppliers and structural engineers with their construction. This presentation describes the design and planning efforts required for their construction. Formwork and shoring design, constructability, tolerance control, sequencing, concrete mix design, concrete placement, consolidation, safety, access was all critical to the successful construction of these prominent columns in Chicago’s newest super tall high-rise. This presentation discusses relevant aspects of ACI 117 Tolerance, 309 Consolidation and 347 Formwork documents utilized.
Shoring and Reshoring Per Pour Inspections - What to Look For
Presented By: Kris Hughes
Affiliation: Baker Concrete Construction, Inc.
Description: Pre pour shoring and reshoring inspections are critical to the success of a project and are required by OSHA. This presentation will cover basic inspection requirements and common issues found in the field. This presentation will also cover what to do when you find differences between the shoring drawings and the shoring installed in the field. The presentation will also cover who should do the inspections and when the inspections should take place.
Formwork Design and Construction Practices with Respect to Achieving Specified Tolerances
Presented By: Eric Peterson
Affiliation: Webcor Builders
Description: In the past tolerances were specified in various sections of the Codes and Specifications produced by ACI. Many of the tolerances for concrete structures were communicated by specifying tolerances on formwork, specifically in the Guide to Formwork for Concrete, published by ACI 347. The problem with doing this is that what matters more than the formwork accuracy are the concrete surfaces produced by the formwork once the concrete is placed. Now, tolerances on formwork have almost ceased being published and tolerances are solely specified and evaluated on structure surfaces its elements as published in ACI 117 Specification for Tolerances for Concrete Construction and Materials. This presentation addresses what considerations and techniques can be applied for realizing the expected tolerances on concrete structures and, how and when they are evaluated. It stresses the importance of measuring work in place as a means of iteratively improving processes.
Formwork Construction Oversight: Formwork Construction Deficiencies and Prevention
Presented By: Pericles Stivaros
Affiliation: GEI Consultants, Inc
Description: Formwork is a temporary structure which supports the freshly placed concrete. Though formwork is a temporary structure, it is subjected to various construction loads, including dead loads, live loads, but most importantly horizontal loads and construction induced vibration excitations. Due to the temporary nature of the formwork, its design and construction may not receive as much attention as the design and construction of the final concrete structure that the formwork is called to support during its early age. The result is formwork failures. Unfortunately, formwork design and construction oversights are not scarce. Some of these oversights result to dramatic failures with extensive media attention. Others never came out of the construction sites, and private litigation proceedings, and remained unknown to the general engineering community.
This presentation discusses the various formwork construction deficiencies as outlined in ACI 347 Guide to Formwork and other ACI 347 documents and suggests methods and procedures to avoid such oversights and deficiencies.
Ensuring Formwork Compliance in a Non-Conforming World - Formwork Specifications
Presented By: Daniel Toon
Affiliation: United Forming, Inc.
Description: When most engineers think about specifications, they consider the requirements and product data related to components incorporated in the final work product in a project, items from steel reinforcement, glazing, even the floor finishes. Most do not immediately think of formwork and shoring, the system of temporary works needed to confine concrete to its needed shape until the concrete cures and becomes self-supporting. However, most all concrete construction projects make reference to formwork in their specifications and generally these specifications describe the process used to build and execute the activities associated with formwork in addition to the products in use for the temporary work – even though these items are typically not permanently incorporated into the final work.
The presentation “Ensuring Formwork Compliance in a Non-conforming World” will cover common reference specifications, challenges with references, and best practices to manage expectations and provide successful construction outcomes. It will also highlight default requirements included in ACI 301 and potential project impacts of these defaults.