Is it okay to drive the chemical anchor bolt up at the bottom of the beam?

Yes, but it is recommended to use imported and domestic agents, which are very thin and cannot be coagulated at the bottom of the beam.

For the fixation of the rear embedded parts of the curtain wall, the current code requires that chemical anchors or planting bars must be used, and expansion bolts are not allowed.

For the use of chemical anchors, there are the following requirements:

1. The type, specification, quantity, arrangement and anchorage depth of anchor bolts must comply with the design and relevant standards.

2. The matrix concrete where the anchor bolt is buried should meet the design requirements. If the concrete strength does not meet the design requirements, the design unit should be reported to modify the anchorage parameters. Weathered concrete, severely cracked concrete, uncompacted concrete, structural plastering layer, decorative layer, etc., shall not be used as anchoring substrates.

3. The concrete surface should be solid and smooth, and there should be no defects that affect the anchorage bearing capacity, such as sanding, shelling, honeycomb, and hemp surface.

4. The anchor bolt shall not be arranged in the concrete protective layer, and the anchorage depth shall not include the finishing layer or plastering layer of the concrete.

5. The anchor bolt should not be set in the area with dense reinforcement (such as the bottom of the load-bearing beam), and the main reinforcement should be avoided, and the drilling hole should not hurt the reinforcement. For waste holes, chemical anchoring glue or high-strength resin cement mortar should be used to fill them.

6. For the anchor holes of the expansion anchor bolt and the reaming anchor bolt, the air compressor or manual air cylinder should be used to blow the powder in the hole, and the hole should be basically dry; For the anchor hole of chemical reinforcement, the air compressor or manual air cylinder should be used to blow the crushed ballast and dust in the hole first, and then use C.

Keto wipe the pores and keep the pores dry.

7. It is not suitable to carry out welding operations on the connecting parts in contact with the chemical anchor bolt.

8. Carbon steel anchor bolts should be treated with anti-corrosion.

9. Each connecting node should not have less than 2 anchors.

10. The diameter of the anchor bolt should be determined by the calculation of bearing capacity, and should not be less than 10mm.

11. The burial of the anchor bolt should be firm and reliable, and the casing should not be exposed.

12. After the chemical anchor bolt is implanted in the anchor hole, it should be cured and cured according to the maintenance conditions provided by the factory, and disturbance is prohibited during the curing period.

13. It should be tested for pulling.

If from the perspective of structural stress, the upper steel bar of the beam is anchored upwards in the column, and the segment return key can also meet the anchorage length. However, in the construction stage, the upper column has not yet been poured, or has just been poured and has not yet reached the design strength, the upper steel bar of the beam can not be stressed, and the self-weight of the structure and the construction load must be borne by the rent. At this point, the structure will be destroyed.

It is even more impossible for the upper reinforcement of the slab to be anchored upwards, there is already no concrete on it, and there is nowhere to anchor it.