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Use only chain to secure large boulders.
Should be located in valleys or notches across the top of the boulder
Must be arranged to prevent sliding across the rock surface.
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.
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.
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.
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.
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.
To secure a cubic-shaped boulder, how many tiedowns are required, at minimum?
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 securing a non-cubic boulder with an unstable base, the four surrounding chains must have a WLL of at least:
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.
When using tiedowns to secure boulders, all of the following are requirements except:
Use only chain to secure large boulders.
Should be located in valleys or notches across the top of the boulder
Must be arranged to prevent sliding across the rock surface.
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