Working safely with precast tilt-up data center construction involves several critical steps to mitigate potential hazards. Here's a breakdown of key areas to focus on:

1. Structural Stability and Support:

• Ensure precast concrete wall units, structural framing, and tilt-up wall panels are adequately supported to prevent overturning and collapse until permanent connections are completed [1]. This includes proper bracing and shoring designed by a qualified engineer, especially for free-standing walls exceeding 2 meters in height [2].
• Pay close attention to the erection drawings and procedures, ensuring they are prepared and certified by a professional engineer to maintain structural stability during assembly [3].

2. Lifting and Rigging:

• Lifting inserts embedded in tilt-up precast concrete members must support at least two times the maximum intended load, while those in other precast members should support at least four times the load [1]. Lifting hardware should support at least five times the maximum intended load [1].
• Use tag lines to control loads during hoisting, unless a qualified rigger determines they create a hazard [4].
• Components of multiple lift rigging assemblies must be specifically designed and assembled with a maximum capacity for the total assembly and each individual attachment point, certified by the manufacturer or a qualified rigger with a 5:1 safety factor [5].

3. Fall Protection:

• Employees engaged in precast concrete erection who are 6 feet (1.8 m) or more above lower levels must be protected from falling by guardrail systems, safety net systems, or personal fall arrest systems [6]. If these systems are infeasible or create a greater hazard, a fall protection plan meeting the requirements of §1926.502(k) must be developed and implemented [6].
• When working on exposed roofs or floors, always use fall-protection equipment [7].
• Ensure that fall arrest system components are used in fall restraint systems and conform to the criteria in 29 C.F.R. §1926.502, with anchorages capable of supporting at least 3,000 lbs (4.5 kN) per employee attached [8].

4. Controlled Decking Zones (CDZ):

• If using a CDZ, ensure each employee working within it has completed CDZ training in accordance with C.F.R. §1926.761 [9].
• Maintain a current and accurate list of employees authorized to work in the CDZ and ensure they are easily identifiable [8].

5. Training and Competency:

• Provide special training to employees engaged in multiple lift rigging procedures and connector procedures [10].
• Ensure personnel are trained by a qualified person(s) [10].
• Retrain employees when changes in the workplace or fall protection systems render previous training obsolete, or when inadequacies in their knowledge or use of fall protection systems are observed [11].

6. Inspections and Maintenance:

• Conduct frequent and regular inspections of job sites, materials, and equipment by competent persons [12].
• Visually inspect cranes before each shift, checking control mechanisms, safety devices, and pressurized lines [4].
• Regularly service and inspect hoisting machines, cables, and equipment after each installation and every 30 days thereafter [7].

7. General Safety Practices:

• Never allow employees under precast concrete members being lifted or tilted into position, except those required for erection [1].
• Ensure that the predetermined safe rate of lift is not exceeded [13].
• Protect power cords or air hoses at sharp edges and ensure proper grounding of all electrical power sources [14].
• Implement measures to prevent unrolled wire mesh from recoiling, such as securing each end of the roll [13].

8. Emergency Preparedness:

• Develop and implement procedures for rescue or emergency response [15].

9. Fall Distance Calculation:

• Rig fall-arrest systems to prevent a free fall in excess of 6 ft [14].

By adhering to these guidelines, employers can significantly reduce the risk of accidents and injuries associated with precast tilt-up data center construction.