1. Contractor Safety Forum Submission January 16, 2018
Incident Report: Articulated Rock Truck Partial Rollover November 21, 2017
Contractor Safety Forum Submission
January 16, 2018

2. Situation Creating stockpile of fill material
Rock Trucks dumping on top of pile
Bulldozer shaping material to minimize footprint and waste – Operator acting as spotter for trucks.
Just prior to raising load, rear tires on right side of box section of truck slipped off edge of path and box tipped onto side.

3. CNL Supplied Photos of Incident

4. Incident Witness Statement:
1:17pm “I drove by a rock truck backing up a sand hill. Looked in the rear view mirror and the truck was rolling over onto its side. I was the first responder and watched the driver leave the cab of the truck. I spoke with him and he was ok and calm. I called and reported to security. I called my section head to report the incident. The fire truck was there immediately and we secured the scene. It was determined that there were no fluids leaking from the truck. I took photos with a company camera. Security arrived and took statements from driver and witness. Deep River Police arrived (approximately 45 minutes later), took statements and pictures. There were no injuries and the vehicle had not rolled over. The contractor decided to use his equipment on-site to right the vehicle.”

5. Immediate Corrective Action:
A BEI Mechanic was consulted prior to moving the rock truck.
A bulldozer was chained to the front of the rock truck. A hoe was used to rotate the truck box upright. The hoe held the truck in place as the driver drove forward. The maneuver was completed smoothly with no equipment damaged or employees put at risk.
No danger to the environment was present.

6. Articulating Truck Function
Click picture to play video

7. Articulated Rock Truck
Comparison
Articulated Rock Truck
End Dump Truck
Tri-Axle Truck
Very large heavy-duty type of dump truck 
Excels in hauling material over rough terrain
A rugged vehicle usually has all-wheel drive with two basic units: the front section, called the tractor and the rear section that contains the dump body, called the hauler
Built to handle great inclines and slippery conditions
Steering is made by pivoting the front in relation to the back by hydraulic rams. This way, all wheels follow the same path
An excellent off-road vehicle
Larger capacity tractor-trailer combination
The trailer itself contains the hydraulic hoist
In the US a typical semi end dump has a 3-axle tractor pulling a 2-axle trailer with dual tires
Key advantage: a large payload
Key disadvantage: very unstable when raised in the dumping position limiting use where dumping location is uneven or off level
Most commonly used
Truck chassis with a dump body mounted to the frame
Bed is raised by a vertical hydraulic ram mounted under the front of the body
The back of the bed is hinged at the back of the truck
It has one front axle and one or more rear axles
Standard dump trucks include the six-wheeler and ten-wheeler
Offers great maneuverability
Can not be used over soft soils
Sourced from:

8. Articulated Rock Truck Rollover
South Charleston, WV
2004

9. Triaxle Dump Truck Rollover
Massachusetts Turnpike
May 28, 2015

10. CTV Kitchener Published Monday, June 19, 2017 2:26PM EDT
Live Bottom Rollover
CTV Kitchener  Published Monday, June 19, :26PM EDT

11. Dumping Guideline
Dumping Articulated rock trucks are designed so that the cab is independent of the box. They are designed this way to provide safety for the operator and the machine so that when dumping in soft ground conditions the box can topple over without taking the cab with it.
Sourced from:

12. Topple Over Guideline (WorksafeBC)
If the box topples over and there is no speed involved, there is not usually any damage done. Ensure the following before attempting to right the box:
The lift cylinders have not been damaged.
The rubber blocks or the bolts and brackets that hold the under-carriage to the frame are not damaged or broken.
All of the hydraulic and electrical lines are still intact between the tractor and trailer.
As much material is cleaned out of the box as possible.
The box lever is placed in the down position; make sure the box is pulled or pushed down tight to the frame. This will put the box guides around the frame and prevent the rear box hinges from being twisted as the box is pulled up.
Use an excavator as it is the best machine when righting the box as the excavator bucket can be placed inside the box in order to pull the box upright.
If a loader or similar piece of equipment is used, attach a pulling cable to the box lift point at the cab end of the box.
Sourced from: