What are the rules for blocking and Jack stand?
1. Students shall only elevate and block vehicles or mobile equipment under the direct supervision of an instructor. 2. Any re-adjustment of the load on any support mechanism shall be supervised by the instructor. 3.
How are flat jacks used for jacking structures?
A flat jack is consists of two steel plates joined at a rim. When inflated, the upper and lower plates are forced apart and can exert forces up to 15 N/mm2. Flat jacks are uniquely able to operate in locations where the gap available for jacking is 50mm or less.
What’s the maximum load you can put on a jack stand?
1. Loads placed on jack stands shall not exceed 50% of the manufacturer’s rated capacity of the jack stand (i.e. if jack stand rating is 6 tons, maximum permitted load is limited to 3 tons). 2. Jack stands shall always be used in pairs. 3. All jack stands shall be provided with labels indicating the proper procedure to be followed
How big can hydraulic jacks be used for?
Conventional hydraulic jacks are available in a range of capacities up to 1000 tonnes. Equipped with a swivel head, they are able to accommodate slight misalignment of the jacking surface and subsequent rotational movement of the structure.
What’s the nominal size of a concrete block?
The nominal dimension is the actual dimension of the concrete brick with the width of the mortar joint added. The average mortar joint for a CMU is 3/8 inch. The nominal dimension works within the standard construction materials that follow the 4-inch grid. To better understand how the nominal size works for CMU block sizes, consider the following:
What are the dimensions of a terminal block?
Dimensions are not intended to be used for manufacturing purposes. Note: Height dimension is measured from top of rail to top of terminal block.0.20″ (5 mm) 1.78″ (45.3 mm) 1.38″ (35 mm) 0.24″ (6 mm) 1.78″ (45.3 mm) 1.38″ (35 mm) 0.28″ (7 mm) 1.87″ (47.6 mm) 1.61″ (41 mm) SpecificationsSingle-circuit terminal block. Single-circuit terminal block.
Do you use one Jack Block per stabilizer?
If you want the most solid and absolute best results on a trailer that has more than 4 stabilizer jacks, use one block per stabilizer. LESS STRESS! Using the Trailer Jack block under your jack (s) means your jack doesn’t need to extend down as far, saving on wear and tear over time.
How big is a half block of concrete?
Half Blocks. Concrete wall. Half blocks are 7 5/8 by 7 5/8 by 7 5/8 inches, or 8 by 8 by 8 inches with a 3/8-inch masonry joint. Half blocks are used for beams, lintels and as end blocks in walls where the layers of standard blocks are offset by 50 percent.