Mumbai University > Civil Engineering > Sem 8 > Construction Engineering

Marks: 10Marks

Liner plates are standard sized pressed steel plates, plain or corrugated are used to support soil and the work is carried on in short lengths corresponding to the length of these plates. The plates are made with flanges of angle shape on all four sides. All the flanges carry holes through which they are connected together by bolts and nuts longitudinally and transversely.

Liner plates are generallymade of 400 mm x 900mm with 50mm flange on all foursides. Another common size is 400 mm x 950 mm.

I beams or T beams are used asstiffenersforstrengthening the liner platesfor tunnels of diameter greater than 3 m.

Advantages:

• Easy to handle as they are light in weight.

• Saving in excavation and concreting work

• The number of joints are reduced as compared to timber plates due to the fact that the liner plates are large in size.

• Can be erected with the help of unskilled labour.

• They are fireproof and hence work can be carried out under compressed air.

• Excellent method of minimizing ground subsidence in urban areas.

• This method grants an absolute control of running ground and water.