Corrective grindings in the VNA system

Spot grinded VNA (Very Narrow Aisle) in a warehouse

In the case of joint-less industrial floors, if a narrow aisle (VNA) system is used, some corrective grinding in the aisle sections is practically essential to achieve the required floor flatness. It is valid for both new and older concrete surfaces.

The most efficient and economical way of corrective grinding is the so-called “Spot-grinding” method.

What is Spot-Grinding?

By corrective grinding on the concrete surface of the narrow aisles – only in wheel tracks-adapting the Fmin system can form the flatness requirements for the ideal truck movement/speed.

Montage of corrective grinding in warehouses

Here are the steps of corrective Spot-grinding:

We are surveying the narrow aisle in the truck wheel tracks with a D-meter using a fixed pattern to create a complete set of vertically correlated wheel track profiles, collecting data in 30 cm increments in each track.

The recorded data evaluate using the Grinding Optimization software.

The obtained “map” will indicate in the wheel tracks along the aisles’ entire length and the depth of grinding required at each spot to bring the wheel tracks into full compliance with the specified Fmin. It guarantees the optimum speed of the lift truck in the given aisle, according to the type of truck used -via the control of the six variables on the Fmin measurements tab.

We grind to the appropriate level in the spots indicated by the “map,” where necessary (and only there).

We grind the individual spots together to achieve the desired surface evenness in the wheel tracks.

We re-evaluate the flatness in the wheel tracks and make any necessary corrections. Determine the aisle’s Fmin values by repeated measurements and prepare the corridor classification according to the Fmin system.

Why is Spot-grinding a uniquely suitable method?

Compared to any other corrective grinding method to achieve floor flatness in VNA, this method:

  1. significantly more economical, feasible at lower cost
  2. the cost can be determined in advance from the pre-grinding surveys (before we start corrective grinding, we know exactly how much to grind)
  3. Keeping in mind the principle: “to grind only as many as necessary,” there is no excessive grinding, which is time and energy consuming and does not improve the truck’s movement.
  4. Spot-grinding is a real GREEN TECHNOLOGY: the machines’ built-in power (grinding equipment, dust extractors, etc.) is about a quarter of the machine power used in other corrective grinding technologies.
  5. Further energy reduces factor is that do not have to grind in the entire aisle. Only in the particular wheel tracks part (therefore, it is essential to use a preliminary survey and the Grinding Optimization System): less to grind reduces costs.
  6. It provides the required Fmin value for optimal truck movement quickly and cost-effectively.

Areas of application

in new warehouses using the VNA system.

In “old” warehouses where function change is needed
( e.g., transforming Random Traffic area to a VNA system).

in case of extension of the narrow aisle

in the event of a warehouse reorganization
(e.g., moving the shelf system, changing the shelf arrangement)

Before planning your VNA system, contact us to save unexpected and unnecessary expenses and save time and energy!