The Best Way To Cut off Concrete Gutters – Using The TS 800 Stihl Cut off Saw
One of the most important issues surrounding concrete gutter removal is the actual method used to cut off the concrete. At a depth of 150mm for the profiled gutters and 190mm for the square gutters it’s important that the cutting tool is capable of making a clean cut without any damage to the concrete that is to remain in place.
In our constant quest to improve our methods, reduce on site time and increase efficiency, we recently purchased a Stihl TS 800 concrete cut off saw- the largest hand held available in the UK.
The Stihl TS 800 will take a diamond blade of 406mm diameter enabling a cut depth of 148 mm with a new blade. The saw is capable of cutting off the 150mm profiled concrete gutters in a single pass. The square profiled gutters are left with approximately 42mm of concrete that can be cut from underneath with an offset tungsten carbon blade in an Arbortech 170 Brick Saw.
Due to its engine size (98cc) and power output (5.0kW) the saw makes light work of cutting through the concrete gutters. It has a dual filtration system which reduces maintenance and improves machine life. Its robust design makes it ideal for the abuse it receives during the concrete gutter removal process.
The Marcrist MI850 400mm Diamond Blade is designed to cut cured reinforced concrete with soft to hard aggregates, making it an ideal disc for cutting the pre-cast Finlock concrete gutter blocks. The blade is designed for both wet and dry cutting with a subsequent reduced life when used for dry cutting as the diamonds wear more quickly. Each blade will cut the gutters of about 8 properties. They cost just under £200, at a cost of around £25 per property.
Summary of the TS800 Performance
The saw is quite heavy at 13kg but the reduction in cutting time more than makes up for the extra weight in terms of operator fatigue.
The saw has now completed 8 concrete removal schemes without a hiccup. Well, not quite: inadvertently it was filled with neat petrol without 2 stroke oil which has ruined the piston and barrel so at present the saw is in for some £250 worth of repairs.
Future Cut Off Techniques
At present we are investigating the viability of using diamond chain technology to utilising either a 110v Cardi 13” electric chain saw or the ICS 14” petrol saw. Both may offer a reduction in time and a subsequent reduction in labour cost. The down side is that both need to be operated wet as the chain needs cooling to eliminate expansion, and the diamond impregnated teeth need lubricating to prevent premature wear. With the chains costing around £216 and the bars £147, each chain being capable of cutting 2 properties, each bar 6 properties, the cost per property is around £150 in consumables. The offset in reduced labour time is less than £25, so an increased cost per job of approximately £100.
We are planning on trialing the diamond chain saw in the next few weeks and will report on it in our latest news blog.
These are the Features and Technical Specifications listed by Manufacturers Stihl for the TS800
Reduced-emission engine technology
2-stroke engine with stratified charge. A fuel-free layer of air is created between the burned charge in the combustion chamber and the fresh charge in the crankcase, reducing the amount of fuel lost during the charge cycle. This results in more power with a lower weight, up to 20% lower fuel consumption than regular 2-stroke engines and significantly reduced exhaust emissions.
Manual fuel pump (Purger)
A small fuel pump delivers fuel to the carburettor at the touch of a button. This reduces the number of starting strokes required following extended breaks in operations.
STIHL ElastoStart reduces the shock caused by the compression of the engine during starting. The compression shock is taken away from the user’s joints and muscles through a spring or rubber element in the starter handle
Water is supplied to the cutting wheel through the standard water connection with sprinkler system to suppress the dust produced during cutting. It is supplied to the device in such a way so as not to interfere with your work.
Pre-separation air filtration system
STIHL long-life air filtration systems with pre-separation achieve perceptibly longer filter life compared with conventional filter systems. Air drawn in is swirled. The larger, heavier particles are ejected. The pre-cleaned air is routed to the air filter via the pre-separator duct.
Intense vibration at the handles of power tools can lead to long-term effects on blood vessels in the hands and arms. STIHL has therefore developed an effective anti-vibration system whereby the oscillations from the machine’s engine are dampened which significantly reduces vibrations at the handles.
Ergonomic grip position
The modern, ergonomic design allows each user to work with an optimal grip position. The loop handle facilitates excellent cutting comfort in any working position.
Semi automatic drive belt tensioning
Light, consistent re-tensioning increases the service life of the belts and shaft bearings.
Displacement cm3 98.5
Power OutputkW/bhp 5.0/6.8
Weight kg 13.0
Sound Pressure LeveldB(A) 101.0
Sound Power Level dB(A) 113.0
Vibration levels left/right m/s 6.5/3.9
Cutting Wheel inches 16
Cutting Depth mm 145
Total Length cm 89