FORMWORK COST AND CONSIDERATIONS

We are reviewing Chapt. 1&2and we assigned Chapt. 3 & 4 for reading assignment!!!

Chapter One- Introduction to FormingChapter Two- General Objectives in Formwork BuildingChapter Three-Overall Planning for FormworkChapter Four-Materials, Accessories, Proprietary Products

Book Overview

What is forming and formwork?

What is its purpose?

What are the objectives of any form design?

The form design must provide,

THE BEST QUALITY

SAFETY

ECONOMICS

What kind of nomenclature or terminology is associated with forming?

Discussion of some Case Studies on Pages 2-4 to 2-8

FORMWORK COST AND CONSIDERATIONS

What considerations should be made when considering the economics and planning of formwork?

1. Must be treated as an integral part of the overall plan2. Must be used efficiently3. Must permit a nominal investment for single use and an optimum investment for multiple reuse4. Must consider availability of skilled labor5. Must consider availability of stock/ special materials6. Must be adapted to work with the structure requirements7. Must consider the practical construction sequence

FORMWORK COST AND CONSIDERATIONS

What will determine an efficient formworksystem?

1. Analysis of placing schedules (p.13, fig 3-11,3-12 ) 2. Stripping time requirements3. Accessibility 4. Existing site conditions5. Capacity of form handling equipment

FORMWORK COST AND CONSIDERATIONS

What components or factors make upthe development of a formwork system?

1. The capacity of mixing and placing equipment (p.3-2 , fig 3-1 & 3-2)2.Construction joints between adjacent sections - limits size of lifts/placements3. Form Detailing(p.2-13 fig 2-9)4. Re-use of forms- stripping time, movement capability,etc.(p.3-4, fig 3-3)5. Location of form construction i.e site, prefab, ready-made(proprietary) (p.3-5, fig. 3-4) {slipform- 15-3,15-4} {gang forms 9-20, flyforms-9-50}6. Type of surface providing support (i.e. concrete, sand, clay, etc.)7. Reshoring Requirements8. Weather - (i.e. protection vs. stripping time)

FORMWORK COST AND CONSIDERATIONS

What directly influence the cost?

1. Maximum re-use of materials (p3-7,fig3-6)2.Uniformity of sections (p.2-12 #8 & fig 2-9)3. Minimum # of forms used for the maxi- mum # of times.4. Maintenance of smooth job flow5. Efficient setup and stripping (p.3-11, fig 3-10)6. Labor cost - minimum skilled-unskilled labor ratio7. Labor cost to the type of hardware- i.e some ties require more labor to install8. Rental of forms vs. building in shop (p.3-5, fig 3-4)

FORMWORK COST AND CONSIDERATIONS

What are different method of pricing formwork?

1. It may be included in the lump sum price for the entire job.2.In may be included in the unit paid per cubic yard of concrete in place.3. A separate unit price per square foot of formed area is established.

FORMWORK COST AND CONSIDERATIONS