Slipforming of reinforced concrete shield building
Citation
Asian Architect & Contractor, v.14, no.2, 1984, pp. 84-85, 88-91
Abstract
The unique design and construction features of slipforming the heavily reinforced concrete cylindrical shield walls at the Satsop nuclear plant site are presented. It proved that, with proper planning, design, and co-ordination, the slipform construction technique can be successfully applied to large and heavily reinforced concrete structures. The shield walls were designed in compliance with seismic requirements which resulted in the need for reinforcing steel averaging 550 pounds per cubic yard (326 kg/cu m). A 25 ft (7.6m) high, three-deck moving platform was designed to permit easy installation of the reinforcing steel, embedments, and blockouts and to facilitate concrete placement and finishing. Two circular box trusses, one on each side of the shield wall, were used in combination with a spider truss to meet both the tolerance and strength requirements for the slipform assembly. Use of preassembled, lifted-in-place sleeve tower racks that combined diagonal and vertical bars for the openings with two vertically aligned pipe sleeves greatly eased th installation. Specific recommendations for future slipforming are also presented.
(1) Introduction
(2) Building design development
(a) Seismic consideration
(b) Static analysis and design
(3) Building design features
(a) Reinforcing steel arrangement
(b) Penetration and block-outs
(c) Embedded plates
(4) Slipform design development
(a) Tolerances
(b) Shifting
(c) Drift and rotation
(d) Analysis of slip form structure
(5) slipform operation
(a) Penetration sleeve placement
(b) Concrete placement
(6) Conclusions
(7) Recommendations
Description
Subject
Type
Article
Format
Date
1984
Language
en