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Remove overhead form work after concrete pour

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Toolbox Talk: Safe Removal of Overhead Formwork After Concrete Pour

Date: [DATE] Duration: [DURATION] minutes Presenter: [PRESENTER NAME] Location: [LOCATION]

Objective

To ensure all workers understand the safe procedures and requirements for removing overhead formwork after a concrete pour, ensuring the concrete has gained sufficient strength to support its weight and any additional loads.

Introduction

Removing formwork too early can lead to structural failures and accidents. It is crucial to follow specific guidelines to ensure the concrete has adequately cured and can support itself and any superimposed loads.

Presenter Note: Engage the audience by asking if anyone has personal experience related to premature formwork removal.

Key Points

  • Formwork should not be removed until the concrete has gained sufficient strength.
  • The strength of the concrete should be verified through appropriate testing methods.
  • Reshoring should remain in place until the concrete can support all loads.
  • Follow the plans and specifications for formwork removal conditions.
  • Ensure all safety measures are in place before starting the removal process.

Hazard Identification

  • Premature Removal: Can lead to structural collapse and serious injuries.
  • Inadequate Reshoring: May result in the concrete not being able to support loads, leading to failure.
  • Improper Testing: Without proper testing, the concrete's strength may be overestimated.

Presenter Note: Encourage participants to share any additional hazards they've encountered.

Control Measures

  • Testing: Use ASTM standard test methods to verify concrete strength [1].
  • Compliance: Follow the conditions stipulated in the plans and specifications for formwork removal [1].
  • Reshoring: Ensure reshoring is not removed until the concrete has adequate strength [2].
  • Inspection: Have a competent person inspect the formwork and shoring before removal [2].

Safe Work Procedures

  1. Verify concrete strength through testing.
  2. Ensure compliance with removal conditions in the plans.
  3. Inspect formwork and shoring for stability.
  4. Remove formwork only when concrete strength is confirmed.
  5. Maintain reshoring until concrete can support all loads.

Presenter Note: If possible, demonstrate the safe work procedure or use visual aids.

Personal Protective Equipment (PPE) Requirements

  • Hard Hats: To protect against falling debris during formwork removal.
  • Safety Glasses: To protect eyes from dust and debris.
  • Safety Boots: To protect feet from heavy objects and sharp debris.

Real-World Example or Case Study

Discuss a case where premature formwork removal led to a structural collapse, emphasizing the importance of following proper procedures and testing.

Presenter Note: Ask participants if they can relate this example to their own experiences.

Group Discussion

Discuss the following questions:

  1. What are the risks of removing formwork too early?
  2. How can we ensure concrete has gained sufficient strength?
  3. What are the consequences of not following the removal conditions?

Presenter Note: Encourage active participation and facilitate the discussion.

Emergency Procedures

  1. Stop all work immediately if a collapse is imminent.
  2. Evacuate the area and ensure all personnel are accounted for.
  3. Report the incident to a supervisor immediately.
  4. Follow the site-specific emergency response plan.

Questions and Answers

Encourage participants to ask questions and provide answers to common questions related to the topic.

  • Q: How do we test concrete strength?

A: Use ASTM standard test methods designed for concrete compressive strength [1].

  • Q: When can reshoring be removed?

A: Only when the concrete has attained adequate strength to support all loads [2].

  • Q: What should be done if formwork removal conditions are not clear?

A: Consult the project engineer or a competent person for guidance.

Summary

  • Ensure concrete strength is verified before formwork removal.
  • Follow all specified conditions for safe removal.
  • Maintain reshoring until concrete can support all loads.
  • Use appropriate PPE during the removal process.

Action Items

  1. Review the formwork removal conditions in the project plans.
  2. Ensure all personnel are trained on safe removal procedures.
  3. Conduct regular inspections of formwork and shoring.

Remember: Safety first, last, and always.

Report all hazards, near-misses, and incidents to your supervisor immediately.

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2 source record(s)

Sources used for this answer

[1] General Regulation (N.B. Reg. 91-191)

Page 106

Open source document

Source excerpt

- 94.1 (7) An employer shall ensure, before concrete is poured, - (a) that the formwork and shoring are inspected by an engineer, or a competent person designated by the employer, and - (b) that the engineer, or the competent person desig -nated by the employer, as the case may be, authorizes the pour in writing. - 94.1 (8) An employer shall ensure that the written au -thorization referred to in paragraph (7)(b) - (a) is kept on the project site, and - (b) is made available to an officer on request. - 94.1 (9) An employer shall ensure that the formwork and shoring are not removed unless - (a) the concrete is strong enough to support itself and any loads that may be applied to it, or - (b) the concrete is adequately reshored. - 94.1 (10) Where concrete is reshored under para -graph (9)(b), subsections (2), (3), (4), (5) and (6) apply, with the necessary modifications, to the reshoring. - 94.1 (11) Subsections (2), (3), (4), (5), (6), (7), (8), (9) and (10) do not apply where formwork and shoring are used no more than 3 m above the ground level. - 94.1 (12) Where formwork and shoring are used no more than 3 m above the ground level, an employer shall ensure that the formwork and shoring are erected, sup -ported and braced so that they are capable of withstand -ing all loads and forces likely to be applied to them. - 94.1 (7) L'employeur doit s'assurer, avant que ne soit versé le béton, - a) que le coffrage et les étançons sont inspectés par un ingénieur, ou par la personne compétente désignée par l'employeur, et - b) que l'ingénieur, ou la personne compétente dési -gnée par l'employeur, selon le cas, en autorise le ver -sement par écrit. - 94.1 (8) L'employeur doit s'assurer que l'autorisation écrite visée à l'alinéa (7)b) - a) se trouve sur les lieux du chantier, et - b) est mise à la disposition d'un agent, sur demande. - 94.1 (9) L'employeur doit s'assurer que le coffrage et les étançons ne soient enlevés que si - a) le …

[2] Rules for the Administration of the Oregon Safe Employment Act (Construction, Division 3, OSHA Oregon)

Page 770

Open source document

Source excerpt

Stat. Auth.: ORS 654.025(2) and 656.726(3). Hist: APD Admin. Order 8-1989, f. 7/7/89, ef. 7/7/89. OR-OSHA Admin. Order 6-1991, f. 3/18/91, ef. 4/15/91. <!-- image --> Division 3 AO 1-2003 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (7) The predetermined safe rate of lift shall not be exceeded. - (d) Reinforcing steel. - (1) Reinforcing steel for walls, piers, columns, and similar vertical structures shall be adequately supported to prevent overturning and to prevent collapse. - (2) Employers shall take measures to prevent unrolled wire mesh from recoiling. Such measures may include, but are not limited to, securing each end of the roll or turning over the roll. - (e) Removal of formwork. - (1) Forms and shores (except those used for slabs on grade and slip forms) shall not be removed until the employer determines that the concrete has gained sufficient strength to support its weight and superimposed loads. Such determination shall be based on compliance with one of the following: - (i) The plans and specifications stipulate conditions for removal of forms and shores, and such conditions have been followed, or - (ii) The concrete has been properly tested with an appropriate ASTM standard test method designed to indicate the concrete compressive strength, and the test results indicate that the concrete has gained sufficient strength to support its weight and superimposed loads. - (2) Reshoring shall not be removed until the concrete being supported has attained adequate strength to support its weight and all loads in place upon it. [53 FR [redacted postal code], June 16, 1988, as amended at 61 FR 5510, Feb. 13, 1996] Stat. Auth.: ORS 654.025(2) and 656.726(3). Hist: APD Admin. Order 8-1989, f. 7/7/89, ef. 7/7/89. OR-OSHA Admin. Order 6-1991, f. 3/18/91, ef. 4/15/91.

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