Specification requirements for reinforcement implantation depth

The specification of reinforcement implantation depth requires that there is a positive correlation between reinforcement implantation depth and reinforcement hole depth. Generally, the hole depth is 10d ~ 15d (d is the rebar diameter). ?

How to ensure the anchoring effect;

1. Popularizing the reinforcement technology of planting bar glue in building engineering can effectively avoid the damage to the surface of the original concrete member and the secondary disturbance of the steel bars in the member.

Planting steel bars on concrete members means drilling holes in old concrete, then cleaning the holes, removing impurities in the holes, pouring steel bar glue into the holes, and inserting steel bars into the holes. After the reinforcement glue is cured, it will produce enough bonding force with the interface between reinforcement and concrete, so that the reinforcement and concrete members can be firmly and effectively connected.

2. In the rebar planting construction, rebar glue is the main function. After the reinforcement glue is poured into the hole, under the locking force of the reinforcement, it can produce high-strength bonding force, and finally the reinforcement and concrete can be effectively anchored together. This method has the advantages of fast construction speed, small engineering quantity and easy operation, and is suitable for the construction of steel bars, members and steel bars in concrete structures.

3. The anchorage depth of reinforcement generally refers to the depth that the stressed reinforcement of beams, plates, columns and other components extends into the component. The anchoring depth is specified to ensure the force transfer effect of reinforcement. If there is not enough anchorage depth, the stress of reinforcement can not be effectively transferred to the anchorage body. If the steel bar is not buried deep enough, the amount of steel bar glue will be reduced and the strength of steel bar will be discounted.

However, this conclusion is based on the same strength of base material, steel grade and steel glue type, which depends on the actual situation. ?

4. In addition to the hole diameter, the depth of bar planting should be considered from the following three aspects: the first aspect is the strength and performance of the bar planting adhesive itself, the second aspect is the strength of concrete members, and the third aspect is the seismic capacity of joints.

The depth of rebar planting determined during reinforcement is not determined at will. It should be based on these four aspects and finally determined according to the results obtained after detailed investigation and calculation. It is necessary not only to check the construction drawings, but also to judge the best depth of rebar planting according to the comprehensive measured data and the location of rebar planting.

5. In addition, when reinforcing steel bars, the holes must be cleaned. If there are stains and residues in the hole, it will be troublesome to inject tape in the later stage, thus affecting the overall construction quality. ?

What are the requirements for the diameter of steel bar planting?

The code adopts GB50367-2006 Code for Design of Reinforcement of Concrete Structures;

φ 10 drilling depth aperture 14mm depth150 mm; ;

φ 12 drilling depth 16mm depth180mm; ;

φ 14 drilling depth 18mm depth 210mm; ;

φ 16 drilling depth: 22mm depth: 240mm;

φ 18 drilling depth is 25mm and depth is 270mm; ：

Φ 20 hole depth, 28mm aperture and 300mm； depth;

φ22 hole depth, 30mm aperture and 350mm； depth;

Φ 25 hole depth, aperture 32mm, depth 375mm；;

Φ 28 hole depth, aperture 38 mm, depth 420 mm.

When the concrete structure is strengthened by planting reinforcement, the concrete strength grade of the original member should be determined according to the field test results.

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.