Self-propelled inverted arch template construction method

Abstract

The invention discloses a self-propelled inverted arch template construction method for a tunnel, which comprises the following construction steps of: setting out a control line for an inverted arch digging section and a longitudinal construction joint according to the design requirement; performing smooth-wall blasting digging on an inverted arch of the tunnel; moving an inverted arch trestle in place; conveying inverted arch stone slag out of the tunnel by using an excavator and a conveying device and abandoning the stone slag in a slag field, and cleaning an inverted arch base; assembling an inverted arch end template; laying steel rails, and moving the inverted arch template to longitudinally move in place per se; starting a hydraulic device to lower the inverted arch template, and supporting the template firmly by using a screw jack; pouring inverted arch concrete; and curing the concrete with equal strength, folding the screw jack, withdrawing a hydraulic cylinder, and releasing a die. The construction method has low cost, is convenient to operate, and improves the construction efficiency; and the longitudinal construction joint is vibrated densely compared with common template construction, and has positive effect of improving the construction quality of tunnel engineering.

Description

【Technical field】 [0001] The invention relates to a construction method of inverted arch concrete formwork for tunnels and underground engineering, in particular to a self-propelled inverted arch formwork construction method for tunnel inverted arches. 【Background technique】 [0002] Tunnel invert refers to the support under the tunnel pavement. The invert construction is usually poured first in the tunnel lining. After pouring, the formwork trolley can be positioned and supported on the invert concrete, so as to pour the tunnel arch wall concrete. [0003] At present, there are few examples of integral formwork used in tunnel inverted arch construction in China. Most of them are assembled manually using small steel molds or channel steels, and then use a large number of steel bars to weld, position and reinforce the small steel molds or channel steels; and some If the overall formwork is used for construction, large-scale lifting machines such as excavators and loaders are ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few examples of integral formwork used in tunnel inverted arch construction in China. Most of them are assembled manually using small steel molds or channel steels, and then use a large number of steel bars to weld, position and reinforce the small steel molds or channel steels; and some If the overall formwork is used for construction, large-scale lifting machinery such as excavators and loaders are required to cooperate with the formwork to be hoisted in place, and the construction efficiency is not high

Since the reinforcement and fixation of the formwork is greatly affected by the uncertain factors of the manual assembly formwork or the hoisting of the overall formwork, the inverted arch formwork will run out during the pouring process, and the concrete at the longitudinal construction joints cannot be vibrated in time or the vibration is not dense; and the formwork is in place. Reinforcement requires a large number of personnel or machinery, and takes a long time. As a result, the progress of inverted arch construction, which is an important link in tunnel construction, often cannot keep up with the progress of excavation. As a result, the tunnel cannot be closed in time to form a ring, and the safe step of tunnel construction cannot be achieved. be effectively controlled

[0004] In the above construction examples, using a large number of steel bars to reinforce the formwork not only wastes a lot of resources, but also does not conform to the conservation-oriented society advocated by the state; at the same time, a large number of personnel and small machines such as electric welding machines are piled up at the inverted arch construction work in the cave , which is not conducive to civilized tunnel construction and construction safety

Images