(1) When supporting the bottom formwork, it is required that the formwork joints should be tight, the joint width should not be greater than 1mm, the joints should be sealed with sea strips, and the flatness of the formwork should meet the design and specification requirements.
(2) 50× 100mm (spacing of 300mm) is set under the bottom die, steel pipes are set under the wood square according to the inclination of stairs, and the vertical support spacing of stairs is not more than1200 mm. 。
(3) The tread side formwork is made of 50mm thick planks, and the height of planks is the same as that of stair tread. The lower part of the plate is chamfered to ensure that the concrete can be plastered to the corners.
(4) The template on the step side is fixed with angle steel to the 50× 100mm wood square set on the upper part of the stairs (the lower part of the wood square is set with 50 thick triangular wood square according to the stair series and step shape, and connected with wood square to ensure the same step width at all levels). When pouring concrete, the lateral pressure of the stair side formwork shall be borne by the wood square set at the upper part of the stairs, and the spacing between the wood squares shall not exceed 1 m.
(5) the upper stairs (fixed:
The lower part is directly fixed on the concrete floor after pouring, and the end part is supported by wood blocks; The upper part is fixed on the poured concrete wall with two inclined wooden squares (in a figure of eight), and then the lower parts of the two inclined supporting wooden squares are connected with one wooden square to increase its stability; Connect the upper and lower parts of the wooden square on the upper part of the stairs to form a whole.
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