How to deal with the variable section of column reinforcement.

1. If the change from 600 to 500 means that one side is reduced by 100, and the beam height is greater than 600, then the redundant 4 and 22 steel bars are anchored straight, and the height is 1.2 times the anchoring length, and the rest steel bars are connected with the upper part, and the steel bars are adjusted to the upper part of the beam.

2. If changing from 600 to 500 means that both sides are reduced by 50, and the beam height is greater than 300, the treatment method is the same as the first one.

3. If the first two conditions cannot be met, it is necessary to hook the steel bar at the lower part of the beam gluten at the variable cross section, and then embed the steel bar at the upper part. The hook length of the lower reinforcement is 200, which is the reduced length of the column, and the anchorage of the upper reinforcement is 1.5 times.

Because the number of column rebar on each side is reduced to 1, the problem of staggered upper rebar should be considered one layer in advance, and the length of rebar should be paid attention to during pressure welding. The other four 22 steel bars are all reserved with higher rebar, and the rebar with shorter original corner rebar is connected with the rebar with the same height, and the rebar with higher original corner rebar is connected with the rebar with the same height minus the welding stagger length.

Extended data:

When reinforcing bars are inserted in the basement, it will be lengthened, so that the connection area will be moved to the connection area at the lower part of the basement roof, and then welded with 20 reinforcing bars. I'm afraid of trouble when cutting, just insert steel bars directly into my head.

Main content and construction technology of column reinforcement binding;

1, construction technology: erection of scaffold supported by column reinforcement → set of column stirrups → connection and binding of vertical reinforced bars → drawing stirrup spacing lines → binding stirrups.

2. Erection of scaffold supported by column rebar: the column rebar support frame is erected with scaffolding steel pipes, and springboard is laid around the working surface and safety net is hung.

3. Setting column stirrups: According to the spacing required by the drawings, calculate the number of stirrups for each column. First, set stirrups on the steel bars protruding from the lower layer, and then tie the positioning steel bars and column steel bars.

4. Mechanical connection: After the main reinforcement of vertical reinforced column is installed, the dimensions of mechanical connection joints and sleeves shall meet the requirements of design and relevant specifications.

5. Draw the stirrup spacing line: draw the stirrup spacing line with chalk on the vertical bar of the column that has been erected.

6. Column stirrup binding: The joints of stirrups (where hooks overlap) should be staggered on the longitudinal reinforcing bars at the four corners. Column corner reinforcing bars and stirrups should be staggered and fastened with double buckles, and the fastening buckles should be splayed with each other. Stirrups should be perpendicular to the main reinforcement.

7, the lower vertical exposed floor with column hoop fixed.

8. Cross-section change: The exposed part of the lower column rebar should shrink accurately before binding the upper beam.

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