What is wall top formwork reinforcement and ladder reinforcement?

The formwork reinforcement at the top of the wall is commonly known as: reinforcement restriction (the length is the same as the wall thickness), which means that the formwork reinforcement is too tight when the formwork is supported, resulting in the thickness of the slab wall being too small to meet the design requirements.

Step bar: it is mainly used to control the spacing of steel bars in shear wall. Like ladders, they are called ladder ribs.

The practice of ladder reinforcement depends on the construction organization design. The distance between the two main bars of the ladder bar is the wall thickness minus the thickness of two protective layers minus the thickness of two horizontal bars (external horizontal bars). When the horizontal bars are built in, it is not necessary to reduce the thickness of the horizontal bars. The lacing bar between the two main bars of the ladder bar can be made of small-diameter steel bars, and the spacing is generally 200 mm It is time-consuming and laborious to make the ladder bar, so it needs to be selected, transported to the processing site, and transported to the binding site after processing.

Extended data:

Code for Design of Wall Top Formwork Reinforcement and Ladder Reinforcement;

1. Main poles parallel to each other and a plurality of pedaling poles vertically and fixedly connected between the two main poles and sequentially distributed at intervals along the extension direction of the main poles;

2. The tread bars at both ends and in the middle of the main reinforcement are top formwork bars, and the tread bars at other parts of the main reinforcement are skeleton bars; The distance between each end of each top formwork reinforcement and the main reinforcement near the corresponding end is equal and greater than the distance between the corresponding end and the main reinforcement near the corresponding end of each skeleton reinforcement, and the length of each top formwork reinforcement = wall thickness-reserved wall expansion value.

3. When the main bars of the stepped ribs stand horizontally along the length extension direction of the cavity to be poured in the wall, the distance between two adjacent stepped ribs is equal to the distance between two vertical steel bars vertically placed in the cavity to be poured in the wall and adjacent to each other along the length extension direction of the cavity to be poured in the wall;

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