00 is closely related to the acceptance of steel bar planting, and the standard should be Technical Specification for Post-anchorage of Concrete Structures (JGJ 145-2004). At the same time, there are local standards in different regions, such as Chongqing local standard "Code for Construction and Acceptance of Concrete Inorganic Anchorage Materials" (DBJ/T50-032-2004).
Terminology in Article 2.10.5 of JJ145-2004: chemical planting of rebar-a kind of post-anchored rooting rebar that uses chemical adhesive (anchoring adhesive) to bond and fix ribbed rebar and long screw in the anchoring hole of concrete matrix;
Terminology in article 2. 1. 10 of GB50367-2006: rebar planting-use special structural adhesive to anchor ribbed rebar or fully threaded screw in foundation concrete.
These two terms about what is "rebar planting" define the type of rebar used for rebar planting: ribbed rebar or fully threaded screw. The transverse rib of ribbed steel bar can make the implanted steel bar colloid form a rib that engages with the transverse rib of the steel bar in the anchorage section. These ribs are mechanical splines to ensure the long-term anchoring performance of implanted steel bars. The spline is too shallow to form effective engagement with the transverse rib of steel bar, and the spline is too deep to resist the shear caused by engagement with the transverse rib of steel bar. Clause 12. 1.4 of GB50367-2006 stipulates that the relative rib area of ribbed steel bars shall meet the following requirements.
The shape of cold-rolled and twisted steel bars can not only form mechanical tooth keys, but also make the local colloid too thick, which will lead to great shrinkage and affect the anchoring effect. Moreover, the colloid thickness of the anchorage section varies greatly. The thicker the colloid, the greater the shear deformation and the smaller the shear stress, while the shear stress at the thinner position will increase accordingly, which will lead to the uneven bond shear stress between reinforcement and colloid and affect the effect of rebar planting. Therefore, the cold-rolled and twisted steel bars should not be used in the roof panel design of this project for planting steel bars!
00 steel bar planting can't use cold-rolled twisted steel bars, can you use round steel bars? In a project, the author once saw an example of vertical distribution of steel bars in a shear wall anchored by Grade I steel bars with a diameter of 8 mm.. Whether the first-grade steel can be used for "rebar planting" is controversial in the industry at present. JGJ 145-2004 and GB50367-2006 stipulate that round steel is not used, because round steel can't form mechanical tooth key, and the long-term anchorage performance of rebar planting can't be guaranteed.
00DBJ/T50-032-2004, Article 3.0. 1 stipulates that the concrete bar planting technology is not applicable to all kinds of lightweight concrete structures, masonry structures and load-bearing structures with round steel. Non-load-bearing structures can be pulled into the structure for rebar planting construction with reference to this regulation. According to this regulation, it is very important to distinguish structural members. In the design of Rachel reinforcement of infilled wall of frame structure, planting reinforcement should be allowed, but the vertical distribution reinforcement of grade I reinforced shear wall should not be used as planting reinforcement for anchorage.
It should be noted that the local standard Southwest 05G70 1 series of drawings recommended three methods of Rachel reinforcement for infilled walls. The first method is to reserve Rachel bars, the second method is to embed iron pieces, and the last method is to plant bars. However, in the national standard 06G614 promulgated later, there are two ways: reserved lacing and embedded iron parts, and it is not recommended to plant rebar to fill the wall lacing.