Code for Acceptance of Construction Quality of Masonry Engineering (GB523-22)

When it is not possible to leave an oblique if at the temporary discontinuity in areas with seismic fortification intensity of 6 and 7 degrees, a straight if can be left except at the corner, but it must be made into a convex if.

Rachel reinforcement shall be added at the straight place, and the number of Rachel reinforcement shall be 1 φ 6 Rachel reinforcement per 12mm wall thickness (2 φ 6 Rachel reinforcement shall be placed on the 12mm wall thickness), and the spacing along the wall height shall not exceed 5mm；; The embedding length shall not be less than 5mm on each side from the leaving place, and it shall not be less than 1mm； in areas with seismic fortification intensity of 6 degrees and 7 degrees; There should be 9 hooks at the end.

Code for Design of Masonry Structures (GB 53-21)

The joint between brick masonry and constructional column should be built into a horse tooth, and two 6-Rachel steel bars should be set every 5mm along the wall, and each side should not be less than 6mm into the wall.

Extended information:

In earthquake-resistant areas, when ring beams are provided at the bottom of slabs, the precast slabs should be provided with 1 φ 8 tensile reinforcement at each slab joint at the slab end, and the reinforcement at the middle wall extends into the slab for 1mm on each side, and the end wall extends into the wall and bends. If the slab span is greater than 4.8m, the side of the first precast slab against the wall along the slab span direction shall also be provided.

It is connected with 1Φ8 steel bars at a distance of 1mm, one end of which is bent downward through the gap between the first and second plates, and the other end is bent into the wall. In areas with seismic grade of 7 degrees and below, the above-mentioned tie bars do not need to be tied with ring beams; 8, 9 degrees area, in addition to the above tie bars, should also be embedded in the ring beam under the plate reinforced with the above tie bars.

Rachel reinforcement is a kind of reinforcement in building engineering. It is built into the wall and placed in the brick layer to connect the masonry to prevent cracking.

Rachel bars are usually made of thin steel bars with a diameter of 6.5 mm, which are often used at L corners and T-corners of brick walls. One layer is placed every 5 mm, and one layer is placed every 125 mm in width. Length according to specifications. Rachel reinforcement must be placed in accordance with the regulations when leaving the masonry.

Reference: Baidu Encyclopedia-Code for Design of Masonry Structures

Reference: Baidu Encyclopedia-Rachel.