334.3R-05: Construction of Concrete Shells Using Inflated Forms

334.3R-05: Construction of Concrete Shells Using Inflated Forms

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Description

This report provides information on the construction of structural concrete shells using an inflated form. Major facets of the construction process are covered, including foundations, inflation, monitoring, and backup systems. Other aspects, such as the geometric variations of inflated forms, thickness of polyurethane foam, and mixture proportions for shotcrete, are also considered.

Keywords: dome; fabric; inflation; polyurethane foam; reinforcement; shotcrete; thin shell.

 

Document Details

Author: ACI Committee 334

Publication Year: 2005

Pages: 13.00

ISBN: 9780870311956

Categories: Shells

Formats: PDF

Table of Contents

Chapter 1—General

1.1—Introduction

1.2—Scope

1.3—History

1.4—Methods

1.5—Definitions

1.6—Preconstruction

1.7—Work schedule

Chapter 2—Foundations

2.1—General

2.2—Concrete

2.3—Soil conditions

2.4—Reinforcement material

2.5—Placement of reinforcement

2.6—Placement of anchors

2.7—Concrete placement

2.8—Foundation dowels

2.9—Uplift prevention

Chapter 3—Inflated forms

3.1—General

3.2—Inflated form material and manufacturing

3.3—Field layout

3.4—Form protection

3.5—Initial stretching

3.6—Inflation

3.7—Construction tolerances

3.8—Air pressure maintenance

3.9—Collapse prevention

3.10—Miscellaneous connections

3.11—Fabric form repair

3.12—Polyurethane foam (when used)

3.13—Preparation

3.14—Foam application

3.15—Construction hazards

Chapter 4—Shotcrete dome

4.1—General

4.2—Reinforcement material and size

4.3—Clear spacing between bars

4.4—Splices

4.5—Cover

4.6—Preliminary reinforcement mat (premat)

4.7—Shell reinforcement

4.8—Preconstruction shotcrete tests

4.9—Shotcrete compression tests

4.10—Proportions and materials

4.11—Field practice

4.12—Nozzle operator qualifications

4.13—Shotcrete operation

4.14—Discharge time

4.15—Joints

4.16—Multi-pass technique

4.17—Curing

4.18—Shotcrete placement tolerance

4.19—Shotcrete damage

4.20—Completion

Chapter 5—References

5.1—Referenced standards and reports

5.2—Cited references

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