CBLM_Stripping Formwork Components

COMPETENCY-BASED LEARNING MATERIAL

Sector:

CONSTRUCTION

Qualification Title:

CARPENTRY NC II

Unit of Competency:

STRIP FORMWORKS COMPONENTS

Module Title:

STRIPPING FORMWORKS COMPONENTS

Technical Education and Skills Development Authority Jacobo Z. Gonzales Memorial School of Arts and Trades San Antonio, Biñan City

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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HOW TO USE THIS COMPETENCY BASED LEARNING MATERIAL Welcome to the module in Stripping formworks. This module contains training materials and activities for you to complete. You are required to go through a series of learning activities in order to complete each learning outcome of the module. In each learning outcome are Information Sheets, Self-Checks, Operation Sheets and Job Sheets. Follow these activities on your own. If you have questions, don't hesitate to ask your facilitator for assistance. The goal of this course is the development of practical skills. To gain these skills, you must learn basic concepts and terminology. For the most part, you'll get this information from the Information Sheets and multimedia materials. This module was prepared to help you achieve the required competency, in "Stripping Formwork Components". This will be the source of information for you to acquire knowledge and skills in this particular competency independently and at your own pace, with minimum supervision or help from your instructor. Remember to: Work through all the information and complete the activities in each section. Read information sheets and complete the self-check. Suggested references are included to supplement the materials provided in this module. Most probably your trainer will also be your supervisor or manager. He/she is there to support you and show you the correct way to do things. You will be given plenty of opportunity to ask questions and practice on the job. Make sure you practice your new skills during regular work shifts. This way you will improve both your speed and memory and also your confidence. Use the Self-checks, Operation Sheets or Job Sheets at the end of each section to test your own progress. When you feel confident that you have had sufficient practice, ask your Trainer to evaluate you. The results of your assessment will be recorded in your Progress Chart and Accomplishment Chart. You need to complete this module before stripping formworks assigned to you.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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MODULE CONTENT UNIT OF COMPETENCY

: Strip Formwork Components

MODULE TITLE

: Stripping Formwork Components

MODULE DESCRIPTOR :

This unit covers the knowledge, skills and attitudes in stripping formworks components and accessories for concrete work. It includes preparing tools, equipment and staging of materials and shoring and reshoring operations.

NOMINAL DURATION CERTIFICATE LEVEL PREREQUISITE

: : :

NC II

LEARNING OUTCOMES: Upon completion of this module, the trainee/student must be able to: 1) Prepare staging area, tools and equipment 2) Strip formworks of building components 3) Shore or/and re-shore and removal

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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ASSESSMENT CRITERIA: 1)

Work instruction is secured from immediate superior according to company rules and regulations.

2)

Appropriate PPE is selected and used according to job requirements and OSHC specifications.

3)

Formwork components and accessories staging area is identified and prepared based on job requirements.

4)

Formwork components power, hand tools and equipment are selected and prepared consistent with job requirements.

5)

Formwork components and accessories are removed carefully, safely and sequentially.

6)

Formwork components and accessories are sorted, arranged and properly staged according to company rules and regulations/manufacturer's recommendations.

7)

Formwork components and accessories are cleaned, oiled and stored according to company rules and regulations/manufacturer's recommendations.

8)

Formwork components and accessories, which are beyond repair, are discarded otherwise repaired in accordance with company rules and regulations.

9)

Formworks components are shored and re-shored in accordance with stripping procedures.

10) Shores are removed in accordance with standard dismantling procedures. 11) Shores, tools and equipment are cleaned, maintained and stored properly according to company rules and regulations. 12) Unexpected situations are responded to in line with company rules and regulations. 13) Daily report is accomplished according to company rules and regulations. 14) Housekeeping is performed according to safety regulations.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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LEARNING OUTCOME NO. 1

Prepare staging area, tools and equipment

CONTENTS: • Company Rules and Regulations ASSESSMENT CRITERIA • Work instruction is secured from immediate superior according to company rules and regulations. • Appropriate PPE is selected and used according to job requirements and OSHC specifications. • Formwork components and accessories staging area is identified and prepared based on job requirements. • Formwork components power, hand tools and equipment are selected and prepared consistent with job requirements. • Unexpected situations are responded to in line with company rules and regulations. • Housekeeping is performed according to safety regulations. CONDITIONS: You must be provided with the following: 1. WORKPLACE LOCATION 2. TOOLS AND EQUIPMENT Crow bar Claw Hammer Pliers Wrench Shovel Scaffolding 3. TRAINING MATERIALS Leaning Packages Bond paper Ball pens Manuals Related References

Hard hat Hard shoes Goggles Gloves Circular Saw

ASSESSMENT METHOD Portfolio

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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Learning Experience Prepare staging area, tools and equipment Learning Activities

Special Instructions

•

Read Information Sheet No. 4.11 on Company Rules and Regulations

•

Answer Self-Check No. 4.1-1

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Compare your answer key

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

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INFORMATION SHEET NO. 4.1-1 COMPANY RULES AND REGULATIONS Learning Objective: After reading this INFORMATION SHEET, YOU MUST be able to be familiar with the COMPANY RULES AND REGULATIONS IN STRIPPING OF FORMWORK COMPONENTS A. Introduction Stripping formwork can be one of the most hazardous phases of concrete construction. While falling objects are the primary hazard, there may also be fall hazards as a result of floor collapse and manual tasks hazards from a person working in awkward postures, repetitive handling of materials and limited task variety. As with formwork erection, the stripping operation must be carried out in an orderly, progressive manner. B. Exclusion zone Only persons involved in the stripping operation should be permitted in the area to be stripped. Stripping are as should be cordoned off and signs should be displayed. The signs should require persons to keep out of the area.

Danger FORMWORK STRIPPING IN PROGRESS AUTHORISED PERSONS ONLY

It is preferable to restrict access to the whole floor where soffit stripping is taking place and this should reduce the quantity of signage and barricades required. Where other trades are required to work on the same floor during stripping of walls, columns or small sections of soffit, the principal contractor or employer should ensure that stringent controls are applied that prevent other persons from entering the stripping area.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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C. Removal of the formwork The period for which forms should be left in place depends upon the temperature of air, the shape and position of structural member (i.e. horizontal vertical or inclined), the nature of the loads likely to come and the character of the cement and cement paste. Generally, the use of rapid hardening cement, higher temperatures, low water cement ratio and lighter loads, will permit early removal of formwork. Under normal conditions where temperature is above 20ºC and ordinary cement is use, forms may be removed after the expiry of the period given below:

Particulars of the structural member

Period of removing of formwork

a) Vertical sides of slabs, beams columns and wall

24 to 48 hours

b) Slabs (props or vertical supporting member left under)

3 days

c) Beams soffits (props left under)

7 days

d) Bottom of slabs up to a span of 4.5 m.

7 days

e) Bottom of slabs above 4.5 m span, bottom of the beams up to 6 m span, and bottom of arch ribs up to 6 m span

14 days

f) Bottom of beams over 6 m span and bottom of arch ribs over 6 m span

21 days

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 8 of 24 Revision # ____

SELF-CHECK NO. 4.1-1 Name of Trainee:_________________________________ Date: __________________ Check your mastery in company rules and regulations of removing formworks by completing the tasks below. MATCHING TYPE. Match the structural member to pediod of removing the formwork by writing your answer on the space provided.

COLUMN A Particulars of the structural member

COLUMN B Period of removing of formwork

_____1. Slabs (props or vertical supporting member left under)

A. 24 – 28 hours

_____2. Bottom of beams over 6 m span and bottom of arch ribs over 6 m span

B. 3 days

_____3. Bottom of slabs above 4.5 m span, bottom of the beams up to 6 m span, and bottom of arch ribs up to 6 m span

C. 5 days

_____4. Beams soffits (props left under)

D. 7 days

_____5. Vertical slides of slabs, beams columns and wall

E. 14 days

_____6. Bottom of slabs up to a span of 4.5 m.

F. 21 days

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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ANSWER KEY 4.1-1 Check your answer with the answer key below. If you fail to get it right, refer back to corresponding resources until you make it perfect. 1. 2. 3. 4. 5. 6.

B F E D A D

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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LEARNING OUTCOME NO. 2

Strip formworks of building components

CONTENTS: • Removing Formwork • Maintenance and Storage of Formwork

ASSESSMENT CRITERIA •

Formwork components and accessories are removed carefully, safely and sequentially.

•

Formwork components and accessories are sorted, arranged and properly staged according to company rules and regulations/manufacturer's recommendations.

•

Formwork components and accessories are cleaned, oiled and stored according to company rules and regulations/manufacturer's recommendations.

•

Formwork components and accessories, which are beyond repair, are discarded otherwise repaired in accordance with company rules and regulations.

•

Unexpected situations are responded to in line with company rules and regulations.

•

Housekeeping is performed according to safety regulations.

CONDITIONS: You must be provided with the following: 1. WORKPLACE LOCATION 2. TOOLS AND EQUIPMENT Crow bar Claw Hammer Pliers Wrench Shovel Scaffolding 3. TRAINING MATERIALS

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Hard hat Hard shoes Goggles Gloves Circular Saw Brooms

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 11 of 24 Revision # ____

Leaning Packages Bond paper Ball pens Manuals Related References ASSESSMENT METHOD Portfolio

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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Learning Experience Strip formworks of building components Learning Activities

Special Instructions

•

Read Information Sheet No. 4.2-1 on Removing Formwork

•

Answer Self-Check No. 4.2-1

•

Read Information Sheet No. 4.2-2 on Maintenance and storage of Formworks

•

Answer Self-Check No. 4.2-2

•

Perform Operation Sheet No. 4.2-1 on Stripping Formwork

•

Perform Operation Sheet No. 4.2-2 on Maintaining and storing of Forms

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Compare your answer key

answer

to

the

Compare your answer key

answer

to

the

Evaluate your own work using the Performance Criteria Present your work to your trainer for evaluation Keep a copy of your work for the next activities Evaluate your own work using the Performance Criteria Present your work to your trainer for evaluation Keep a copy of your work for the next activities

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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INFORMATION SHEET NO. 4.2-1 REMOVING FORMWORK Learning Objective: After reading this INFORMATION SHEET, YOU MUST be able to be KNOW the Order and Method of REMOVING FORMWORK. Stripping is the operation of removing the forms. Formwork can either be partially stripped by removing small areas to prevent the slab from deflecting or completely stripped to allow the slab to deflect. As a general rule, formwork supporting members should not be removed before the strength of concrete has reached at least 70 percent of its design value. A. Order and Method of Removing Formwork 1. Shuttering forming vertical faces of walls, beams & column sides should be removed first. Shuttering forming sofit to slab should be removed next. 2. Shuttering forming soffit to beams, girders or other heavily loaded member should be removed in the end. B. Striking The specification will normally give guidance on when forms can be struck and these times may be governed by the size and shape of the member, the concrete mix, and the weather. •

To strike the wallform, ties and clamps should be loosened gradually, a little at a time.

•

To remove the props, release the props evenly in small stages starting at the middle of the span and working out towards the supports. This can avoid overloading of the props at the centre of the span due to large deflection at the center.

•

Always withdraw or hammer down projecting nails as the formwork is struck from the concrete.

•

Make sure that other trades are kept away from areas below those where striking is being done.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 14 of 24 Revision # ____

OPERATION SHEET NO. 4.2-1 Title:

Strip Formwork

Performance Objective:

Given the necessary tools and equipment, you should be able to strip column/beam formwork

Supplies and Materials: Tools and Equipment:

• • • • •

Crow bar Claw Hammer Pliers Wrench Shovel

•

Scaffolding

• • • • •

Hard hat Hard shoes Goggles Gloves Circular Saw Brooms

Steps/Procedure: 1. Prepare tools and equipment needed. 2. Prepare staging area Note: a. Always observe safety measures because stripping form is a very dangerous work on the part of the worker. Be careful in removing the forms because the materials and fresh and concrete output when get damaged won’t be used again. b. Remember that the fresh concrete can already carry its weight after 24-48 hours or more from the pour of the concrete.

3. Remove braces 4. Remove the cleats 5. Remove/pull out nails used in the 4 sides forms with the use of claw hammer, claw bar or pincer. 6. Remove tie/wires or bolts with the use of pliers or wrench. 7. Make a soft hammer strike on the form to loosen it from the concrete. Assessment Method: Performance Criteria Checklist

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 15 of 24 Revision # ____

PERFORMANCE CRITERIA CHECKLIST OPERATION SHEET NO. 4.2-1 Name of Trainee:_________________________________ Date: __________________ CRITERIA

YES

NO

1. Were I able to stripped without damage to forms or concrete? 2. Did I use necessary tools and equipment in stripping formworks? 3. Is the storage area for the formworks organized?

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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INFORMATION SHEET NO. 4.2-2 MAINTENANCE AND STORAGE OF FORMWORK Learning Objective: After reading this INFORMATION SHEET, YOU MUST be able to MAINTAIN AND STORE FORMWORK COMPONENTS Provision must be made for the removal and storage large sections of formwork. A level storage area is required to store formwork after striking. They should be well cleaned before storing because the grout remaining on the forms will become hard and stubborn making it difficult to reuse. Metal panels need a light coating of oil before storage to prevent rust. All forms need to be carefully stacked and stored. Panels of forms should be kept horizontal and face to face. The forms and components should be clearly marked and kept together for easy identification on reuse. A tidy store reduces wastage, damage and losses.

Cleaning As soon as the formwork has been struck, it should be cleaned, not left until it is wanted again. •

• •

•

• •

Timber and plywood forms should be cleaned with a stiff brush to remove any grout; a timber scraper should be used for stubborn bits of grout. With glass reinforced plastics, a brush and wet cloth are all that should be needed. When steel forms are to be put in store or are not going to be used for some time, they should be lightly oiled to prevent rusting. Timber and untreated plywood should also have a coat of release agent applied for protection if they are not going to be re-used immediately. Any depressions, splits and nail holes should be repaired with plastic wood or similar material, followed by a light rubbing down. Before concreting, the insides of the forms should be cleaned. Where the forms are deep, temporary openings should be provided for inspection.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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OPERATION SHEET NO. 4.2-2 Title:

Maintain and Store Formwork

Performance Objective:

Given the necessary tools and equipment, you should be able to maintain and store formwork

Supplies and Materials: Tools and Equipment:

• • • • • •

Crow bar Claw Hammer Pliers Shovel Steel Brush Scraper

• • • • •

Hard hat Hard shoes Goggles Gloves Brooms

Steps/Procedure: 1. Clean timber and plywood forms with a steel brush to remove any grout; a timber scraper should be used for stubborn bits of grout. 2. Apply release agent to timber and untreated plywood for protection if they are not going to be re-used immediately. 3. Repair any depressions, splits and nail holes with plastic wood or similar material, followed by a light rubbing down. 4. Keep panels horizontal and face to face when storing. 5. Mark the forms and components for easy identification on re-use. Remember: A tidy store reduces wastage, damage and losses. Assessment Method: Performance Criteria Checklist

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 18 of 24 Revision # ____

PERFORMANCE CRITERIA CHECKLIST OPERATION SHEET NO. 4.2-2 Name of Trainee:_________________________________ Date: __________________ CRITERIA

YES

NO

1. Did I clean the timber and plywood forms from stubborn grout? 2. Did I applied release agent to timber and plywood for protection? 3. Are depressions, splits and nail holes repaired?

4. Are the panels stored horizontally and face to face?

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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LEARNING OUTCOME NO. 3 CONTENTS: • Shore and reshore removal

Shore or/and re-shore removal

ASSESSMENT CRITERIA • • • • • •

Appropriate PPE is selected and used according to job requirements and OHSA specifications. Formworks components are shored and re-shored in accordance with stripping procedures. Shores are removed in accordance with standard dismantling procedures. Shores, tools and equipment are cleaned, maintained and stored properly according to company rules and regulations. Unexpected situations are responded to in line with company rules and regulations. Daily report is accomplished according to company rules and regulations.

CONDITIONS: You must be provided with the following: 1. WORKPLACE LOCATION 2. TOOLS AND EQUIPMENT Crow bar Claw Hammer Pliers Wrench Shovel Scaffolding 3. TRAINING MATERIALS Leaning Packages Bond paper Ball pens Manuals Related References

Hard hat Hard shoes Goggles Gloves Circular Saw Brooms

ASSESSMENT METHOD Portfolio

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 20 of 24 Revision # ____

Learning Experience Shore or/and re-shore and removal Learning Activities •

Read Information Sheet No. 4.3-1 on Shore and reshore removal

•

Answer Self-Check No. 4.3-1

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Special Instructions

Compare your answer key

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

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to

the

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INFORMATION SHEET NO. 4.3-1 SHORE AND RESHORE REMOVAL Learning Objective: After reading this INFORMATION SHEET, YOU MUST be able to Differentiate Shore and reshore and Know when to remove Shore/reshore. Shores are vertical members made of wood that support recently built concrete that have not developed full design strength. On the other hand, reshores are shores placed snugly under a stripped concrete slab or structural member after the original forms and shores have been removed from a large area. In reshoring, the concrete slab is allowed to deflect and, thus, formwork can be removed from a large area. This can help reduce stripping costs, which is the main advantage of reshores. Formwork is typically supported by several levels of shores and reshores that carry the loads until the concrete gains enough strength to support its own weight and all other externally applied loads.

Typical frame shoring Remove Reshores or Backshores Reshores can be removed after the supported slab or member has attained sufficient strength to support all loads transferred to it. Removal of reshores must be carried out with care to avoid subjecting the structure to impact loads.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 22 of 24 Revision # ____

SELF-CHECK NO. 4.3-1 Name of Trainee:_________________________________ Date: __________________ Check your mastery in shore and reshore removal by completing the tasks below. Discuss the following: 1. Differentiate shore from reshore. 2. When does reshore be removed? 3. How will you carry out the removal of reshore?

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

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ANSWER KEY 4.3-1 Check your answer with the answer key below. If you fail to get it right, refer back to corresponding resources until you make it perfect. 1. Shores are vertical members made of wood that support recently built concrete that have not developed full design strength while reshores are shores placed snugly under a stripped concrete slab or structural member after the original forms and shores have been removed from a large area. 2. Reshores can be removed after the supported slab or member has attained sufficient strength to support all loads transferred to it. 3. Removal of reshores must be carried out with care to avoid subjecting the structure to impact loads.

JZGMSAT QA SYSTEM

Carpentry NC II STRIP FORMWORK COMPONENTS

Date Developed: May 21, 2011 Developed by: Glenn F. Salandanan

Document No. Issued by:

Page 24 of 24 Revision # ____