Safety Alert 1 - Fletcher & Higgins

 Modifications of Tractor Units into Tipper Trucks

Recently at the Victoria Park Alliance project, a truck loaded with AP65 tipped over while getting ready to start spreading the material. As the truck raised its hoist into position to start spreading, the chassis cracked in between the second and third axle on the right side causing the deck to fall to the right.

The investigation identified that the six wheeled truck was once a tractor unit and had been modified into a tip truck. The picture at right clearly shows that the chassis strengthening finishes prior to the third axle, which carries most weight when tipping or spreading material.

Safety Alert 2 - Firth Industries

 Motor Vehicle Accident - Whangarei

On Friday 4th February an on-call driver was requested to work and reported to the Hewlett St, Whangarei Certified Plant. The driver picked up a truck at 5.40am and proceeded to the Dargaville Certified Plant to assist with a large concrete pour (167.8m2). The driver had completed his seventh and final delivery to the customer site and on return to Dargaville refuelled his truck and commenced the drive back to Whangarei.

At approximately 4.20pm the truck left the road and struck a stone wall followed by a power pole which resulted in the truck rolling onto the driver's side and the driver being trapped in the cab.

Safety Alert 3 - Mineral Products Association

 Potential Mixer Drum Entanglement - UK

A serious incident occurred recently during the washing down of a mixer drum following discharged concrete. It is believed that the cause of this incident was the type of tap. The design of the tap, and dependant on where an individual washes the blades, could result in the tap becoming wedged in the mixer blade, pulling the hose and potentially the individuals hands/arm into the mixer.

Safety Alert 4 - NZRMCA Blowback

 NZRMCA Blowback

This NZRMCA Safety Alert addresses the issue of concrete blowback into the truck mixer or bowl, which can be an inherently dangerous procedure unless carefully controlled. Blowback uses high air pressure to move residual concrete from the line or boom pump back into the truck mixer or bowl. Air pressure will cause anything inside the pipe to act as a high velocity projectile. Blowback differs from ‘pumping’ residual concrete back into the truck mixer or bowl. However, excessive pumping pressure may also create similar problems.

Safety Alert 5 - NZRMCA Cement Silo Safety 

 NZRMCA Cement Silo Safety

This NZRMCA Safety Alert addresses the use of pneumatic pressure systems in the delivery and storage of cementitious product to sites. The main areas of concern are listed below. A preventative maintenance program and rudimentary fault report template are also included.

Covering a similar subject to this NZRMCA Safety Alert is a safety training video on the dangers of working with pressure vessels called Don't Tease the Tiger.  This video, available online in three parts, suggests that "even small pressures over large areas result in tremendous stored forces that, if released by hammering tanks, fooling with hatches or increasing pressures beyond design maximums, the explosive forces involved can easily kill."

Safety Alert 6 - Firth Industries

 Detached Concrete Truck Mixer Bowl

On the afternoon of 16th July 2013 a mixer bowl became detached from an 8 wheeler ACCO concrete truck on a public Road in Avondale.  The driver was making a right turn in the left hand outer lane turning out of Rosebank Road into Ash Street. During the turn the driver has felt juddering which got progressively worse. The result was the bowl left the truck and landed on the road. The six bolts connecting the gear box mount to the chassis had been completely sheared in this incident.

Safety Alert 7 - NZRMCA Concrete Mixer Bowl

 NZRMCA Connection Bolts & Secondary Retaining Mechanism Best Practice

The intention of this document is to assist with the development (or revision) of concrete truck maintenance plans to include concrete mixer bowl connection points. The document also covers a secondary retaining mechanism.

All concrete bowls and frames are assumed to have been manufactured using quality materials and recognised engineering design practices. All fabrication and manufacture is assumed to have been completed by personnel trained and competent to undertake the work.

Assumptions are also made of ‘normal’ vehicle use on New Zealand roads, and that the secondary retaining mechanism is for a low speed event, such as a vehicle roll-over while negotiating a round-about, rather than a high-speed event where crash forces can be beyond practical design limits.

Safety Alert 8 - NZRMCA Concrete Delivery to Site

 NZRMCA Concrete Delivery to Site

The Health & Safety At Work Act came into force on 4 April 2016. As a result of the changes there will be:

  • A greater accountability for businesses and individuals
  • A greater requirement for everyone (including contractors) on site to work together to stay safe

The NZRMCA remains committed to assisting Members continually improve their health and safety practices, particularly in terms of delivering ready mixed concrete (a hazardous product) to site.

NZRMCA Concrete Truck Driver Hand Signals (Poster)

Safety is an important issue for the New Zealand Ready Mixed Concrete Association (NZRMCA), and one particular area that the NZRMCA Council has been targeting is the need for a standardised set of hand signals that enables clear communication with concrete truck drivers while on the job. Following consultation across the concrete industry, a set of hand signals was developed, and arranged in poster format.

The NZRMCA urges you to print and distribute the poster to all concrete truck drivers, plant staff, contractors, concrete placers, concrete pumpers, construction site workers and ask them to use this one set of hand signals when working with concrete truck drivers.

With close to 50 member companies, and nearly 180 plants across the country, it is more than likely that the majority of construction jobs involving ready mixed concrete delivery will be serviced by an NZRMCA member. For this reason, the NZRMCA recommends that along with its members, all those who work in the wider building industry adopt the set of hand signals. [ Download Poster]

NZRMCA Driver Training video

CCANZ Flexural Tensile Strength Test video

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