What is the depth of steel bar planting in the secondary structure?

The embedded depth of reinforcement in secondary structure can be divided into two situations:

1, filled with Rachel reinforcement, φ6, implanted length 90 mm?

2, press into the length of the masonry, 6, 7 degrees should not be less than 0.5 of the wall length and not less than 700mm, 8, 9 degrees should be along the wall length.

3. If steel bars are planted, the end of steel bars is 90 degrees, but it is usually 10d when implanted in the wall, and there are also 12d or 15d.

Extended data:

Planting steel bars, also known as planting steel bars, is a connection technology of post-anchorage of steel bars in seismic strengthening engineering of building structures. Using the clamping force of structural adhesive locks, it is the best choice for structural reinforcement and heavy-load fastening application.

When HRB335 steel bar is used for planting, the concrete strength grade of the original member should not be lower than C15; ; When HRB400 grade steel bars are used for planting, the concrete of the original members shall not be lower than C20.

Note: If reinforcement is needed, the diameter of reinforcement shall not be greater than 12mm, and the strength grade of original concrete shall not be lower than C20.

Precautions:

1, welding on the planted rebar is generally not allowed after rebar planting. If welding is really necessary, the distance between the welding spot and the concrete surface of the base material should be greater than 15d, and the exposed root of the steel bar should be wrapped with a towel soaked in ice water (to prevent the concrete from being burned by welding due to cooling).

2. The cofferdam of the bearing platform must be firm, so as to ensure that no water flows into the bearing platform when planting reinforcement, and keep the bearing platform dry. If the bottle cap can't be guaranteed to be dry, then this scheme is not feasible.

3, pay attention to the weather changes, check the weather forecast before planting steel bar construction, to ensure good weather conditions during planting steel bar construction, don't construction in rainy days.

4, steel must be derusted as required, steel surface can't have oil stains and other sundry.

References:

Baidu encyclopedia-planting reinforcement