Review Questions - Click On The Picture To Begin...
- 50% the weight of the boulder
- 5,000 lbs
- 25% the weight of the boulder
- 11,000 lbs
Quote From The CDL Manual:
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.
- 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
Quote From The CDL Manual:
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.
- 2
- 1
- 3
- 5
Quote From The CDL Manual:
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.
- Tiedowns should be located in valleys or notches across the top of the boulder.
- Tiedowns must be arranged to prevent sliding across the rock surface.
- Boulders must be loaded as far back towards the rear as possible.
- Use only chain to secure large boulders.
Quote From The CDL Manual:
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.