CPO Ground Stability & Outrigger Setup 2

Question 1

How should an outrigger pad (crib mat) be sized relative to the outrigger float?

Accepted Answer

The pad should be significantly larger than the float to spread the load over more ground area

Answer

The pad should be the same size as the outrigger float

Answer

The pad should be smaller than the float to concentrate load directly under it

Answer

Pad size is irrelevant as long as it is made of solid timber

Question 2

When setting up on a sloped surface, in what sequence should outriggers generally be deployed?

Accepted Answer

Downhill outriggers first, then uphill outriggers

Answer

All outriggers simultaneously to maintain equal load distribution

Answer

Uphill outriggers first, then downhill outriggers

Answer

Front outriggers first, then rear outriggers regardless of slope direction

Question 3

Which outrigger configuration provides the MAXIMUM stability footprint for a concrete pump truck?

Accepted Answer

All four outriggers fully extended to their maximum spread

Answer

Rear outriggers fully extended, front outriggers at 50%

Answer

Front outriggers fully extended, rear outriggers retracted

Answer

All four outriggers at 75% extension

Question 4

What is a key advantage of timber crib mats over steel plates for outrigger support on soft ground?

Accepted Answer

Timber mats can flex and conform to uneven ground, distributing load more evenly

Answer

Timber mats are heavier and sink less under load

Answer

Timber mats provide better conductivity to ground any static electricity

Answer

Timber mats are cheaper and always preferred regardless of conditions

Question 5

What does the term 'ground bearing capacity' mean in the context of concrete pump setup?

Accepted Answer

The maximum load per unit area that the soil can support without shearing or excessive settlement

Answer

The total weight of concrete the ground can absorb during a pour

Answer

The depth of soil below frost line available to support the outrigger

Answer

The minimum compaction percentage required before pump setup

Question 6

When setting up a concrete pump over a basement or underground parking structure, what critical information must be obtained first?

Accepted Answer

The structural load rating of the deck or slab to confirm it can support outrigger loads

Answer

The color and marking of the parking structure access gates

Answer

The location of the nearest fire hydrant for emergency use

Answer

The depth of the water table beneath the structure

Question 7

How often should the operator visually inspect outrigger pads and ground conditions during an active concrete pump operation?

Accepted Answer

Continuously and at regular intervals throughout the entire pour operation

Answer

Only at the start of the pour and at its completion

Answer

Every 30 minutes on a scheduled basis regardless of conditions

Answer

Only when the boom position is changed to a new quadrant