Reinforced-concrete structures constitute a major portion of today’s construction, and placement of reinforcing bars (rebar) is an integral phase of this type of construction. Placement of rebar is an assembly-type operation with fabricated rebar being placed and tied one by one. Process-oriented planning for the placement of rebar aims at the creation of a placement plan that can depict the assembly sequences of individual bars, or a set or sets of bars. While complex rebar configurations necessitate that the crew foreman creates in his or her mind or on paper such a detailed plan, this traditional planning effort does not impact the delivery and staging of rebar. This paper presents a concept of rebar delivery and staging based on a placement plan and discusses the implementation of the concept in a six-story governmental office building project in Chapel Hill, N.C. Field data on crew performance for the placement of rebar was collected utilizing three different measurement techniques: (1) Productivity ratings; (2) five-minute rating; and (3) continuous time study. The same crew was provided with the rebar delivered and staged two ways: (1) In a traditional manner; and (2) based on the placement sequences. Finally, a comparison of the productivity results was made. It will be demonstrated where process planning was able to significantly reduce nonproductive time. © ASCE.
|Number of pages||19|
|Journal||Journal of Construction Engineering and Management|
|Publication status||Published - 1 Jan 1994|