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Ground Worker
Jargon
Buster:
Back-Drop
Where underground drain runs have to change level to go lower, it is not
possible to increase the slope downwards beyond certain limits as anything other
than clear liquid would be left behind. The way to overcome this is to construct
a manhole where the drain comes in at the top and the sewage then free falls
down a vertical pipe inside the manhole to the new lower level. The advantage to
this method is that the manhole is easily accessible for rodding out blockages.
The manhole is called the backdrop.
Benching
The channel at the bottom of the manhole is finished with smoothed mortar render
to form a self-cleaning slope. This is called benching. Sometimes the benching
may break up causing drain to block.
Bit-Mac
Bitumen macadam coated aggregate, which is laid hot for road and drive surfaces.
It is generally laid as a two-layer make up with the base course using 20-38mm
stone and the wearing course 5-12mm of stone. Dense bitmac (dbm) refers to
graded stone where fine stone is mixed in to fill the gaps and add strength.
This is generally used for roads or heavily trafficked drives.
Blending
Sand topping approximately 30-50mm laid on the surface of the sub-base to
prevent the toppings from running into the sub-base. The blinding also allows
the toppings to move independently from the sub-base.
Brushed Concrete
Concrete surface that has been smoothed then finished with a lightly dragged
broom to provide grip. This is often seen on petrol garage forecourts.
Dpm
Damp proof membrane, used immediately below the concrete ground floor slab to
prevent rising damp. This is also sometimes used on top of the blinding on
concrete drives as a slip membrane to ensure no binding between the layers.
Formation
The deepest point in an excavation for a drive or patio, which is leveled and
smoothed prior to laying the sub-base.
Hepsleve
A trade name for very hard clay pipes jointed with plastic collars.
Plastic
Plastic pipes are often used in domestic underground drainage, as the pipe
lengths are light and long compared to clay. The disadvantage is that the pipes
are not as strong and may have to be encased in concrete in certain conditions,
negating any flexible qualities. In such circumstances, clay may be a better
choice.
Salt-Glazed
Before the super baked clay drainage pipe used today was developed, clay pipes
had to be coated in a kiln-fired clear glaze to ensure a watertight smooth
surface. These pipes were jointed rigidly with sand/cement and tarred hemp.
Spoil
Material dug out from an excavation, which may be referred to on site as muck
and muck-away for removing from site.
Sub-Base
The coarse filling such as hardcore or crushed rock that forms a frost resistant
strong base to spread and cushion the loads. This is usually at least 100mm
thick.
Tamped Concrete
Concrete surface compaction with long heavy board leaving shallow ridges. The
ridges should be shallow to allow water to drain.
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Plumbing Kent
BR6 BR8 CT1 CT10 CT11 CT12 CT13 CT14 CT15 CT16 CT17 CT18 CT19
CT2 CT20 CT21 CT3 CT4 CT5 CT6 CT7 CT8 CT9 DA1 DA10 DA11 DA12
DA13 DA2 DA3 DA4 DA9 ME1 ME10 ME11 ME12 ME13 ME14 ME15 ME16 ME17
ME18 ME19 ME2 ME20 ME3 ME4 ME5 ME6 ME7 ME8 ME9 TN1 TN10 TN11
TN12 TN13 TN14 TN15 TN16 TN17 TN18 TN2 TN23 TN24 TN25 TN26 TN27
TN28 TN29 TN3 TN30 TN4 TN8 TN9
Plumbing South East London
SE1 SE2 SE3 SE4 SE5 SE7 SE8 SE9 SE10 SE11 SE12 SE13 SE14 SE15
SE16 SE17 SE18 SE19 SE20 SE21 SE22 SE23 SE24 SE25 SE26 SE27 SE28
Plumbing East London
E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14 15 E16 E17 E18 |
