For construction precautions, the tunnel inverting base surface must be chiseled, the area of ​​the chisel should not be less than 80%, and the debris should be removed. The processing of the steel bar must meet the size requirements, the binding should be firm, and the steel bar should be disconnected at the expansion joint. Meet the expansion joint setting requirements. After the steel bar is installed, the concrete construction can be carried out after the inspection meets the design requirements. The concrete grade must meet the design requirements. When the concrete is poured, the position of the outer sleeve of the vibration isolator should be strengthened and the height and flatness error cannot exceed limit.
The separator plastic is made of floor glue with a thickness of not less than 1mm. When laying, the rough side is facing upward and the smooth side is facing down. The joint is glued with latex to prevent leakage. The separator is bonded to the side wall of the tunnel with latex at regular intervals, and the separator is prevented from slipping or moving during construction. After the separator is laid and the outer sleeve of the isolator is laid according to the design position, the rail is laid by the bracket rail method. When the support bracket is installed, the leg needs to be between the leg and the outer surface of the outer sleeve (above the diaphragm) Pad a wooden backing plate and stand the leg at the center of the outer sleeve to prevent damage to the diaphragm or impact the side wall of the outer sleeve. The height of the rails and the level are controlled according to the design. The actual rail surface elevation is controlled by reducing the design rail top elevation by 40mm (ie, 40mm jacking is reserved).
The lifting lugs of the outer sleeve and the upper reinforcing bars are temporarily spot welded according to the specific conditions to prevent the sleeve from moving. Then tie the reinforcement and install the floating plate template. After the track is adjusted in place, the shear joints are symmetrically installed along the center of the line. Each floating plate is installed with 4 sets and 2 on each side. The four shear hinges are arranged on the same level with a height of 170 mm from the bottom of the floating plate. After the above work and other related ancillary facilities are installed, the concrete construction of the floating plate can be carried out. In order to prevent the concrete strength from being affected, each floating plate needs to be poured once, the pouring process must not be interrupted, and the concrete grade must meet the design strength requirements.
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