Note: Your are not logged in. We can not keep your scores or track your progress unless you Register and Log In
Driver's Handbook on Cargo Securement - Chapter 13: Large Boulders (continued)
Tie-down Requirements
Requirements
Use only chain to secure large boulders.
Tie-downs in direct contact with the boulder:
Should be located in valleys or notches across the top of the boulder
Must be arranged to prevent sliding across the rock surface.
Special Circumstances: Securing a Cubic-Shaped Boulder
The securement of a cubic-shaped boulder must meet these requirements in addition to the other large boulder requirements in Section 13.
Secure each boulder individually with at least two chain tie-downs placed side-to-side across the vehicle.
Place tie-downs as closely as possible to the hardwood blocking used to support the boulder.
Note: The aggregate WLL of the tie-downs must be at least 50% the weight of the boulder.
Special Circumstances: Securing a Non-Cubic Shaped Boulder with a Stable Base
The securement of a non-cubic shaped boulder with a stable base must meet these requirements in addition to the other large boulder requirements in Section 13.
Secure each boulder individually with at least two chain tie-downs forming an "X” pattern over the boulder.
Pass the tie-downs over the center of the boulder and attach them to each other at the intersection by a shackle or other connecting device.
Note: The aggregate WLL of the tie-downs must be at least 50% the weight of the boulder.
Special Circumstances: Securing a Non-Cubic Shaped Boulder with an Unstable Base
The securement of a non-cubic shaped boulder with an unstable base must meet these requirements in addition to the other large boulder requirements in Section 13.
Surround the top of each boulder at a point between 1/2 and 2/3 of its height with one chain.
The WLL of the chain must be at least 50% of the weight of the boulder.
Attach four chains to the surrounding chain and the vehicle to form a blocking mechanism that prevents any horizontal movement.
Each chain must have a WLL of at least 25% the weight of the boulder, and the angle of the chain must be less than 45 degrees from the horizontal.
Multiple-Choice Questions:
To secure a cubic-shaped boulder, how many tiedowns are required, at minimum?
- 1
- 2
- 3
- 5
Special Circumstances: Securing a Cubic-Shaped Boulder
The securement of a cubic-shaped boulder must meet these requirements in addition to the other large boulder requirements in Section 13.
Secure each boulder individually with at least two chain tiedowns placed side-to-side across the vehicle.
Place tiedowns as closely as possible to the hardwood blocking used to support the boulder.
When using tiedowns to secure boulders, all of the following are requirements except:
- Tiedowns should be located in valleys or notches across the top of the boulder.
- Boulders must be loaded as far back towards the rear as possible.
- Use only chain to secure large boulders.
- Tiedowns must be arranged to prevent sliding across the rock surface.
Requirements
Use only chain to secure large boulders.
Tiedowns in direct contact with the boulder:
Should be located in valleys or notches across the top of the boulder
Must be arranged to prevent sliding across the rock surface.
Requirements for securing a non-cubic shaped boulder with a stable base include all of the following except:
- Secure each boulder individually with at least two chain tiedowns forming an X pattern over the boulder.
- Attach chains together at the intersection
- Wrap chains around the circumference of the boulder.
- Pass the tiedowns over the center of the boulder
Secure each boulder individually with at least two chain tiedowns forming an X pattern over the boulder.
Pass the tiedowns over the center of the boulder and attach them to each other at the intersection by a shackle or other connecting device.
When securing a non-cubic boulder with an unstable base, the four surrounding chains must have a WLL of at least:
- 50% the weight of the boulder
- 25% the weight of the boulder
- 11,000 lbs
- 5,000 lbs
Special Circumstances: Securing a Non-Cubic Shaped Boulder with an Unstable Base
The securement of a non-cubic shaped boulder with an unstable base must meet these requirements in addition to the other large boulder requirements in Section 13.
Surround the top of each boulder at a point between 1/2 and 2/3 of its height with one chain.
The WLL of the chain must be at least 50% of the weight of the boulder.
Attach four chains to the surrounding chain and the vehicle to form a blocking mechanism that prevents any horizontal movement.
Each chain must have a WLL of at least 25% the weight of the boulder, and the angle of the chain must be less than 45 from the horizontal.
Complete!
You can Return To The Table Of Contents
Why Join Trucking Truth?
- The High Road Training Program
- The High Road Article Series
- The Friendliest Trucker's Forum Ever!
- Email Updates When New Articles Are Posted
Apply For Paid CDL Training Through TruckingTruth
Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Seriously! The application only takes one minute. You will speak with recruiters today. There is no obligation whatsoever. Learn more and apply here:
TT On Facebook