Concrete Mixing & Placement

Purpose

Concrete mix and pour operations pose significant possible hazards to employees. This chapter sets forth safety requirements and hazard control for these operations.

Policy

It is the policy of [COMPANY] that all concrete pour operations be conducted under the direct supervision of a competent supervisor. This includes an on site pre-safety brief, inspection of forms, bracing and troughs.

Responsibilities

Management

• Ensure all equipment is routinely serviced and maintained in a safe condition
• Conduct periodic on-site inspection of operations
• Provide operation and safety training for affected employees
• Ensure access to operation areas are controlled

Supervisors

• Provide continuous operation safety observation and control
• Provide immediate corrective training for all unsafe acts
• Conduct pre-pour inspections

Employees

• Follow all safety and operational procedures
• Immediately notify supervisor of all unsafe condition

Hazards

• Engulfment
• Skin irritant
• Form Blowout
• Noise exposure
• Eye hazards
• Impact & pinch points

Hazard Control

Engineering Controls

• Structural forms
• Designed bracing and supports

Administrative Controls

• Employee training
• Operational procedures
• Continuous supervision
• Inspections and audits
• Concrete mix preparation to the design and specific strength required.
• Proper moisture content according to the design specifications.
• Sampling from each batch, or as required by the engineer’s specifications.
• Assignment and use of PPE

Operational Safety

Formwork shall be designed, fabricated, erected, supported, braced and maintained so that it will be capable of supporting without failure all vertical and lateral loads that may reasonably be anticipated to be applied to the formwork.
Drawings or plans, including all revisions, for the jack layout, formwork (including shoring equipment), working decks, and scaffolds, shall be available at the jobsite.

Shoring and reshoring.

All Shoring equipment (including equipment used in reshoring operations) shall be inspected prior to erection to determine that the equipment meets the requirements specified in the formwork drawings.
Shoring equipment found to be damaged such that its strength is reduced shall not be used for shoring.
Erected shoring equipment shall be inspected immediately prior to, during, and immediately after concrete placement.
Shoring equipment that is found to be damaged or weakened after erection, such that its strength is reduced to less than that required by 1926.703(a)(1), shall be immediately reinforced.
The sills for shoring shall be sound, rigid, and capable of carrying the maximum intended load.
All base plates, shore heads, extension devices, and adjustment screws shall be in firm contact, and secured when necessary, with the foundation and the form.
Eccentric loads on shore heads and similar members shall be prohibited unless these members have been designed for such loading.
Whenever single post shores are used one on top of another (tiered), the employer shall comply with the following specific requirements in addition to the general requirements for formwork:
The design of the shoring shall be prepared by a qualified designer and the erected shoring shall be inspected by an engineer qualified in structural design.
The single post shores shall be vertically aligned.
The single post shores shall be spliced to prevent misalignment.
The single post shores shall be a adequately braced in two mutually perpendicular directions at the splice level. Each tier shall also be diagonally braced in the same two directions.
Adjustment of single post shores to raise formwork shall not be made after the placement of concrete.
Reshoring shall be erected, as the original forms and shores are removed, whenever the concrete is required to support loads in excess of its capacity.

Vertical slip forms - steel rods or pipes on which jacks climb or by which the forms are lifted shall be:

Specifically designed for that purpose; and

Adequately braced where not encased in concrete.

Forms shall be designed to prevent excessive distortion of the structure during the jacking operation.

All vertical slip forms shall be provided with scaffolds or work platforms where employees are required to work or pass.

Jacks and vertical supports shall be positioned in such a manner that the loads do not exceed the rated

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