bopsnetwork.blogg.se - What is a dipstick 2272 floor profiler

WHAT IS A DIPSTICK 2272 FLOOR PROFILER SERIES

Trying to grind to achieve random-traffic tolerances is nearly impossible since as you grind one spot to get it into tolerance you end up putting another out of tolerance. Slabs are not equally flat and level everywhere attempting to correct an out of tolerance random-traffic floor usually requires removal and replacement. F min measurement correlates to the specific dimensions of the lift trucks to be used in the facility. Unlike the more common random traffic F-number system of floor flatness, and floor levelness (FF/FL), which uses statistical analysis to determine the overall floor condition with a 90% confidence level, the F min system is a direct measurement methodology for determining what the VNA trucks will experience while operating in the VNA aisleway. F min quantifies the differential elevations the material handling vehicles will feel as they traverse the aisleways. The F min specification is limited to defined-traffic floors for which narrow or very narrow aisle (VNA) operations are to be conducted. Many times, owners and specifiers will request very high random-traffic specifications when what they really want is a superflat defined-traffic floor. This is common practice in Florida, but not for a superflat floor.Īll too often, specifications are misapplied for F min floors. To minimize problems this could create, we used the hot weather concreting recommendations in ACI 305 and started placements in the late evening, allowing for finishing operations to be done overnight during the coolest part of the day.

The construction schedule required that the slab be completed without a roof in the middle of the Florida summer-a challenge to say the least, due to sun, wind, and frequent afternoon thunderstorms.

Floor tolerances for the defined traffic portion of the project were specified to be F min 75 (see sidebar, Defining F min).

The team discussed the specified very narrow aisle (VNA) lift trucks and rack heights, which allowed a refinement in the floor tolerances as recommended in Table 1.1 in ACI 360R-10.

We worked with the ready-mix supplier to design a mix optimized to eliminate aggregate gap grading which improved workability and finishability.

To minimize this probability, the design was adjusted to allow the pile caps and slab to be placed independently. If the piles and slab had been placed monolithically, it would likely have created differential shrinkage and cracking. The pile caps fell directly under the defined traffic aisles.

The slab was designed to be 12 inches thick, supported by piles and pile caps, with #6 rebar at 10 inches on-center each way throughout the slab.

A few important agenda items discussed and resolved were:

WHAT IS A DIPSTICK 2272 FLOOR PROFILER SERIES

But a series of pre-slab construction conferences involving the owner, general contractor, concrete contractor, and floor consultant helped minimize potential problems. ChallengesĮvery project has its challenges, and this one had more than its share.

The facility’s main warehouse is a 56,000-square-foot building with both random-traffic areas and defined-path lift-truck traffic. The slab was constructed in Tampa, Fla., for the new NexLube Blending Facility, an advanced oil re-refining operation that will process up to 28 million gallons of used oil annually. Proper planning and installation techniques combined to make a recent high tolerance, pile-supported structural slab a success.