Obayashi Corporation has developed a "labor-saving berm system" that saves labor in installing gable formwork for pouring and maintaining concrete lining in mountain tunnel construction. The integrated parts are attached to the center (steel formwork) and the formwork is fixed simply by operating the parts. It also eliminates the need for removal, greatly improving work efficiency. Gable formwork can be performed with simple operations and the working time is reduced by about 15% compared to conventional construction methods. It saves labor in tunnel lining formwork and ensures the quality and safety of concrete.
Comparison of conventional construction methods and labor-saving edge systems in formwork work (from press release)
This system secures the gable formwork with a large integrated timber and support material (single tube in conventional construction method). The formwork can be secured by operating the support materials while it is mounted on the central support.
Labor-saving burr system installation status (from press release material)
Structural design can be carried out based on formwork calculations taking into account the working pressure of the concrete lining (maximum pressure at the centre). This eliminates the risk of formwork failure during pouring regardless of the skill of the worker. The hassle of moving, fixing and dismantling timber and single pipes called Batakaku is eliminated, reducing tedious work. By removing scaffolding inside the centre, the risk of accidents such as tripping while walking is reduced.
Mountain tunnels are lined by pouring concrete between the center and the ground to be installed inside the tunnel. The installation of gable formwork to fix the center and pouring, curing the lining concrete is done for each concrete block, so fixing the center takes about 25% of the time.
Depending on the skill of the worker, if the formwork is not properly secured, there will be cases of formwork failure during the pouring process. After the parts are removed, they are temporarily placed on scaffolding, causing people to trip when walking through the center.
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