Underground Drainage

Common defects of underground drainage

1)      Blockage in the drains, this means you will have to dig down to the gutter to find your problem.

 

2)      Roots from trees and plants over growing and breaking the drains, which leads to leaks and water not being able to pass through.

 

3)      Damage to the pipes, thermal and ground movements can cause the pipes to come out of the sockets.

Limitations for pipes

Pipe joints can only take so much pressure before they can start to break.  So before using pipes you should research on how much pressure certain pipes can take.

Most pipes are made of plastic which means they can bend, this is a big limitation as the pipes need to then be cut and jointed.

Materials

Double socket

Rest bend

Underground pipe

Pipe couplers

Single socket

Bottle gully

Riser

Mini access chamber 3 inlet base (man whole)

Rubble bags

Radius 90

Tools

Shovel

Saw

Tape measure

Bung

Broom

Bin

Dustpan and brush

RISK ASSESMENT.

Place: 17 Walton way, Keymer

Date: 13/06/2012- 20/06/2012

Activity:   Installing underground drainage

Risk Assessment Done By: Crookes Crooked Construction & Co.

Hazard identified:

1.      Working in confined spaces

2.      Working with heavy materials such as piping

3.      Trench collapsing

Who might be harmed:

1.      The people working in the trench

2.      The people working in the trench

3.      Anyone down in the trench at the time of collapsing

Risk level:

1.     Low

2.     Medium

3.     High

Control measured required:

1.      Take your time working and not have anything down the trench that isn’t needed at the time

2.      Taking your time and more then one person lifting the heavy materials to make it easier

3.      Move the earth we dug out away from the trench and compact the side of the trench so there is no loose earth

 

Method statement

We will put on our PPE before we start the installation of the underground drainage. Then we will get rid of the earth in the area that we need to work in by using a shovel and hand digging out the earth. To install the drainage system. We will start by installing a bottle gully with the top just level with the ground, then we will attach the 90 degree radius to it and attach the other side to the man hole, this will need to be on a slight gradient so the water flows down and doesn’t backflow. We will then link it up to the underground pipe that leads to the sewage system and test it all to make sure there is no leaks or blockages in the set up. All the waste will go into the hippo bags.

 

Quote.

Mr and Mrs Wang

Keymer

17 Walton Way

BN10 4WA

After my trip to your property I have assessed what needs doing and have attached a quote, the tools are already supplied all we will need is the money for the materials up front and the labour charge can be paid once the job is completed to your satisfaction.

Materials:

87.5 Double socket rest bend, quote: 12719-73/   £11.48

Underground pipe 6m pack (2x3m) plain ended kite marked, quote: 14129-73/ U/ground pipe brown. £16.17

Pipe couplers single socket, quote: 13738-73/ £2.97

Back inlet bottle gully, quote: 10965-73/ 200mm riser, quote: 12051-73/ bottle gully. £7.23

Mini- access chamber 3 inlet base, Quote: 18837-73/ £22.97 quote: 11153-73/ £14.46

4trade builders rubble sacks, (10pack x2) quote: 2223807-73 £5.00#

1 Hippo waste bag (The company pick the bag up from the drive way) £100

 

Labour costs:

4 builders: £50 per person, £200 per day. 7 days, £1400

Travelling costs:

Company van/ petrol costs: £140 for 7days.

Two motor vehicles/ petrol costs: £70 for 7days.

Total pricing for keymer job:

Travelling: shipping: labour: P+P:                                £1,782.32