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Matters needing attention in the construction of positive and negative wire connection of column reinforcement

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Matters needing attention in the construction of positive and negative wire connection of column reinforcement
(1): The use of positive and negative wire
Under normal circumstances, when the column reinforcement is unloaded on the top layer, there will be a hook length. Since the hook length has a directional requirement when binding, and it is inconvenient to rotate, the column reinforcement should be connected by a positive and negative wire sleeve when the column reinforcement is on the top layer. .
(2): The use of reducing sleeves:
In some cases, the size of the upper and lower steel bars will be inconsistent, that is, 32 to 25, 32 to 20, 25 to 20, etc., which can be solved by using a variable diameter sleeve. The sleeve connection is different from electric welding. It is not limited by the size of the difference between the two steel bar specifications, such as 32 to 16. Electroslag pressure welding is not allowed to have a large diameter difference, but it can be connected with a sleeve.
(3): The use of sleeves with variable diameter positive and negative wires:
When the above two situations of <1> and <2> occur at the same time, use a variable-diameter positive and negative wire sleeve. In this case, special attention should be paid to the specification of the anti-wire joint of the steel bar and the anti-wire in the sleeve, otherwise it will not be possible. Normal construction, and the amount of rework is also very large.

2020-04-28

2020-04-28

2020-04-28

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