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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:

Question #777 (1 of 4)

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Wen 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
  • 11,000 lbs
  • 5,000 lbs
  • 25% 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 from the horizontal.

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Question #776 (2 of 4)

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Requirements for securing a non-cubic shaped boulder with a stable base include all of the following except:

  • Attach chains together at the intersection
  • Wrap chains around the circumference 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

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.

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Question #775 (3 of 4)

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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.
  • Use only chain to secure large boulders.
  • Tiedowns must be arranged to prevent sliding across the rock surface.
  • Boulders must be loaded as far back towards the rear as possible.
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.

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Question #778 (4 of 4)

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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.

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