Lattice girders are supporting elements in tunnels and they normally consist of steel bars laced together in triangular pattern. They are made to suit the shape of the tunnel. Owing to their small steel reinforcing area, they are not expected to contribute much to the overall support of tunnel. Instead, they are designed and provided for the following reasons:
(i) They have similar spacing with rock bolts and they are intended to provide temporary support to rock which is readily to loosen and fall.
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(ii) Their presence provide an indication if sufficient thickness of shotcrete is applied.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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give me the details of tunnel latic girder which things they put in latic girder