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Working with CleverScan Data

With the ever increasing use of the CleverScan system in HADDMS projects, this page aims to touch briefly on just a few key points, where thought should be given towards creating high quality manhole cards from within the WinCan VX node data entry area. Attention will not be given to the majority of data fields inside the WinCan VX HADDMS project that are considered to not need any explanation or education.

The CleverScan user manual can be found at 14_WinCanVX_CleverScan_EN

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CleverScan system is an automated manhole inspection that is all about productivity and detail.

With the press of a button, CleverScan performs a rapid, high-res, fully automated manhole inspection. You get a flat scan that captures image detail from every inch of manhole wall, plus a dense point cloud that can be easily merged into any CAD or 3D application.

CleverScan’s compact, lightweight design travels anywhere and deploys in minutes.

Further information is available at www.cleverscan.com and sales enquiries should go through WinCan Europe on 01483 762222.

Manhole Parts Length and Width

When adding dimensions of point item parts to a node card, it is common to be unsure which measurement to enter into the Length field and which to enter into the Width field. As a rule of thumb and to ensure consistency throughout all node part detail data entry:

• If the part is circular, then only one dimension needs to be added and it should be added into the Length/Diameter field.

• If the part is not a uniform shape like a rectangle, then:

  • The longest measurement should always be the ‘Length’ value.

  • The shorter measurement should be the ‘Width’ value.

There is no defined method in the HADDMS documentation for which way around you should record the length and width of shapes. The advice offered here is merely a good practice guide where a consistent approach is the key.

Understanding the Shape Value

There is a lot of automation built into the CleverScan application to make life easier including the automated detection of the shape of the chamber at the current depth position. The shape offered here should be treated with an element of caution and carefully considered.

While in most cases it will be accurate and correct, there are some special cases where it can be misleading, and it maybe necessary to ‘overrule’ the shape presented by the system in order to get the best quality data into the node card:

• Reducing Slabs (and possibly Landing Slabs).

  • Imagine a scenario where you have a square manhole cover with a square shaft below it, then a reducing slab and then a circular chamber below that.

  • When the scan line is inside the shaft, it will tell you that the shaft is square and this is good and proper, because it is offering you the shape and dimensions of the inside of the shaft.

  • When the scan lines passes down into the reducing slab, it will continue to tell you that the shape is square, but is this really the case?

  • Most likely, no because the chamber that the reducing slab is sitting on top of is circular, so the real shape of the reducing slab is circular, and the shape that the CleverScan application is presenting to you is not the shape of the reducing slab but is instead the shape of the hole in the reducing slab, so this is a perfect example of where you should decide to manually override the shape that is detected and change it.

The image above shows a nice example of how the landing slab is circular but the hole in it where the manhole cover is located or the shaft is constructed above is square.

Benching Style

When adding benching details to a node part report, there is a field called ‘Benching Style’ which has a drop down list with some options that are not always obvious. These relate construction style of the benching, where there are several different types:

• Half Benching raises to the chamber wall from the top of the channel, about half way up the main pipe.

• Full Benching rises vertically from the channel to the same height as the main pipe and then rises gently to the chamber wall.

• Flat Benching may have a slight fall on it or may even be completely flat, but essentially it is no definable benching at all.

• Improved Benching is where the entire pipe is covered, most often found in Burns chambers where there is a cast iron plate on top of the main channel.

• Depressed Benching is similar to Flat Benching but in this case the pipe is suspended in the air above the manhole base and has no channel, so is a full piece of pipe. Most often found where plastic pipes are used and often there is an access cap on the pipe to allow maintenance access. This is often considered to be a ‘cheap and cheerful’ way of constructing manholes because there is little or no workmanship required to build and render the benching.

Concentric Vs Eccentric Parts

The following node parts will have a field called ‘Concentricity’ which has a list with 2 options:

• Concentric

• Eccentric

These refer to whether vertical line through the 2 shapes is in the same place or in different places. Think of a typical traffic cone standing on the side of the road. This cone shape is a ‘concentric’ cone because the small circle at the top of the cone is directly above and in the centre of the large circle at the bottom - the two circles are on the same axis.

In the example above we see two reducing slabs:

• The one on the left is concentric because the square hole is exactly in the centre of the round reducing slab.

• The one on the right is eccentric because the centre of the circle and the centre of the square are in different places and the square hole is near the edge of the unit.

The parts that have this option are reducing slab, landing slab and taper. In the case of an eccentric part, it is also necessary to define the clock location of the eccentricity, and we do this by recording the clock position where the ‘straight’ vertical part of the node structure is located, so:

• In the example on the left above, we say that the reducing slab is concentric, and no other data is required to be reported regarding it’s concentricity.

• In the example on the right above, we would say that the reducing slab is eccentric and the clock position of the eccentricity is at 10 o’clock.

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