GFRP reinforcement cage erection technology in diaphragm wall

【摘要】：正The use of glass fiber reinforced plastic(GFRP) reinforcement in underground diaphragm facilitates tunneling shield machine to construct underground diaphragm directly.But because elastic modulus of GFRP is only 1/4-1/5 of steel,larger deformation will occur during lifting,so high requirements of lifting are required when GFRP is used in underground diaphragm.In this paper,reinforcement measures are proposed and implemented in practice.Meanwhile,a new type frame is introduced to replace the old reinforcement.After GFRP reinforcement cage is placed into diaphragm trough,the new type frame can be taken out for recycle and save the cost of truss reinforcement in underground diaphragm.During actual lifting,deformation of reinforcement cage and inner forces of reinforcement and truss are monitored.The results make an agreement with the actual condition of the truss.