The formwork construction of the curved staircase is in progress #Staircase #Construction

During the formwork construction of the curved staircase, the following issues need attention:

Measurement and Positioning

- Accurate Measurement: Before construction, accurately measure parameters such as the center position, radius, radian, starting height and ending height of the staircase. Use high-precision measuring tools like total stations, theodolites and levels to ensure the accuracy of the data, as these data are the basis for the subsequent production and installation of the formwork.
- Positioning Recheck: Before and during the installation of the formwork, recheck the plane position and elevation of the staircase multiple times. Deviations in positioning will cause the position and size of the staircase to fail to meet the design requirements, affecting the spatial layout and usage function of the entire building.

Selection and Processing of Formwork Materials

- Material Compatibility: Select materials with good flexibility and high strength to make the formwork. The bottom formwork can adopt multi-layer boards, which can better fit the curve; the side formwork can choose high-quality wooden battens or prefabricated steel formwork, and the step formwork can be customized steel formwork or wooden formwork. Ensure that the quality of the materials is qualified.
- Processing Precision: For wooden formwork, pay attention to cutting and bending according to the designed radian and size during processing. In the case of customized steel formwork, ensure the manufacturing precision of the formwork, including the accuracy of the radian and the dimensional precision of each component. The dimensional error of the processed formwork should be controlled within the allowable range.

Formwork Installation

- Stability of Supports: The spacing between upright poles and the step spacing of horizontal bars in the support system such as full hall scaffolds should meet the requirements of design calculations. During the installation process, check the verticality and horizontality of the supports to ensure that the supports can bear the weight of the formwork and concrete, and also consider various loads during the construction process.
- Splicing of Bottom Formwork: The splicing of the curved bottom formwork should be tight, and there should not be excessive gaps at the splicing joints, otherwise it will lead to concrete leakage. When fixing the bottom formwork, firmly connect it with the supports to prevent the bottom formwork from shifting or deforming.
- Installation of Side Formwork: The installation of the side formwork should ensure that its verticality and radian are consistent with the design. Adopt appropriate fixing methods, such as through bolts, tightening devices, etc., and at the same time, pay attention to sealing the gaps between the side formwork and the bottom formwork and between the side formwork and the step formwork to avoid concrete leakage.
- Step Formwork: The height and width of the step formwork should meet the design requirements, and the height difference between adjacent steps should be controlled within the allowable range. During installation, ensure the horizontality of the step formwork and make it closely connected with the side formwork and the bottom formwork.

Maintenance of Formwork during Concrete Pouring

- Observation of Deformation: During the concrete pouring process, arrange special personnel to observe the deformation of the formwork. If there are signs of deformation of the formwork, such as shaking of supports, sinking of the bottom formwork, bulging of the side formwork, etc., immediately stop pouring and take corresponding reinforcement measures.
- Prevention of Leakage: Continuously check the splicing joints and gaps of the formwork. Once leakage is found, take measures to block it in time, such as using sealing strips, mortar, etc., to prevent the loss of concrete and affect the quality of the staircase.

[allanblount]

Cleverly engineered curved stairway, what's the actual fastener system?