Abstract:

 In order to improve the durability and forcebearing state of the tunnel structure, advance invert and onceforall fullbreadth invert construction have become fundamental requirements for tunnel construction. To this end, sheettype invert trestle of low cost, simple structure, convenient mobility and light weight is becoming increasingly popular at tunnelling. By checking computation of the a 6mlong sheet type invert trestle made of I 20 shaped steel, the strength and rigidity of the trestle under the maximum dynamic load under trackless transportation condition is checked and the dynamic response and safety state of such invert trestle when muck loaded vehicle passes are learnt. Results of such checking can be used for reference in checking computation of structural strength of simple sheettype invert trestles.