(4) The elevation belt template is installed according to the size requirements to ensure that the base width and elevation are accurate. The top surface of the template should be flush with the design elevation. The maximum error requirement should be controlled within 2mm. The template should be stable, straight, flat, without distortion, and phase. Adjacent formwork connection is tight and smooth, no bottom leakage, front and rear staggering, and high and low staggering are prohibited. It is strictly forbidden to dig grooves on the base layer and embed the installation formwork. The formwork is welded to ensure smoothness between adjacent forms The lateral supports are added to support the foot of the side wall of the tunnel, and the additional spacing is generally 1 to 2m; <br>(5) The gap between the formwork and the formwork should be filled with mortar to prevent slurry leakage.
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