A support device and method for the waist of a tunnel for crushing strata
A technology for supporting devices and tunnels, which is applied in tunnels, tunnel linings, underground chambers, etc., and can solve problems such as inability to support boots to provide excavation reaction force, broken waist of tunnels, etc., and achieve the effect of strong practicability and simple operation
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Embodiment 1
[0030] During TBM construction, the broken confining pressure at the tunnel waist is exposed to the shield for 2 minutes to carry out vertical arch work. The steel arch frame used is HW100 H-shaped steel. The distance between the steel arch frames is 1.5m. Three steel arch frames are used; the service length is 3.2m , a wooden formwork with a width of 20cm and a thickness of 10cm, each wooden formwork and between the wooden formwork and the steel arch frame are bound by iron wires, and the order of binding is from the bottom of the tunnel to the top of the tunnel to form a wooden bridge, a wooden bridge The binding height is 2.5m; then insert 2 pieces of 2.8m long and 1.4m wide iron sheets from the upper end of the wooden formwork into the lower end, insert an iron sheet into the interval of a steel arch frame, and insert 10 pieces of iron sheets from the upper and lower ends. Centimeter iron sheets are braced and fixed on the wooden formwork to ensure the smooth surface of the...
Embodiment 2
[0032] During TBM construction, the broken confining pressure at the waist of the tunnel is exposed to the shield for 1 minute to carry out vertical arch work. The steel arch frame used is HW150 H-shaped steel with a spacing of 0.75m and 4 steel arch frames; the use length is 2.5m, Wood formwork with a width of 25cm and a thickness of 15cm, each piece of wood formwork and between the wood formwork and the steel arch frame are bound by iron wires, the order of binding is from the bottom of the tunnel to the top of the tunnel, and the binding height of the wood formwork is 3 m; then Insert 3 pieces of thin iron sheets 3.2m long and 0.75m wide from the upper end of the formwork into the lower end, respectively inserting 3 steel arch intervals, and fasten and fix the 10 cm long iron sheets at the upper and lower ends on the wooden formwork to ensure The surface of the poured concrete is smooth; the bottom of the wooden formwork is blocked with three square logs of 0.75m in length a...
Embodiment 3
[0034]During TBM construction, the broken confining pressure of the tunnel waist is exposed to the shield for 1 minute to carry out vertical arch work. The arch frame used is HW150 H-shaped steel with a distance of 0.75m and 5 steel arch frames; the length is 3.2m and the width 30cm, 20cm thick wooden formwork, bind each wooden formwork and between the wooden formwork and the steel arch frame with iron wires, the order of binding is from the bottom of the tunnel to the top of the tunnel to form a wooden bridge, the binding height of the wooden bridge Then insert 4 pieces of thin iron sheets 4.2m long and 0.74m wide from the upper end of the formwork into the lower end, respectively inserting 4 intervals, and fasten and fix the 10cm long iron sheets at the upper and lower ends on the wooden formwork. In order to ensure the smoothness of the surface of the poured concrete; the bottom of the wooden formwork is blocked with four square logs of 0.75m in length and 10cm in width and ...
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