Reinforcement of frame column

Project overview

According to the design change, the frame column should be reinforced. This project is aimed at strengthening the frame column. Strengthening the frame column by increasing the section area of the column,use HM-500 injection anchoring adhesive.

（increasing the section area of the column）

Construction requirements

1.Strengthening materials

1).Concrete: C50 micro expansive fine stone concrete, the fly ash should be grade I ash, and the burning loss should not be more than 5%.

2).Steel bar: HPB300 class bar, HRB335 grade steel bar, HRB400 grade steel bar.

3).Rebar adhesive:HM-500 injection anchoring adhesive

2.Before the components are strengthened, the original structural components should be discharged from their self weight first.

3.Combined with the new and old concrete, should be cut to combine surface weathering layer Susong, carbonation cracked rust layer and serious oil layer, until completely exposed solid base on the basis of this, the original concrete shall be chipped, clean, and in the new concrete interface before brushing glue.

4.The new increase section column longitudinal reinforcement should be connected with both ends of the original structure is reliable, the bottom should thoroughly and should meet requirements of the anchorage foundation, the upper floor and the upper column should be through the connection or anchor in the roof panel at the top. Due to the reinforcement design of longitudinal bars and beams and columns intersect intersection with the cap, down to the beam anchorage reinforcement technique, and meet the planting margins, spacing and depth, floor using hole wear on longitudinal reinforcement reinforcement to ensure reliable connection.

5.The anchorage depth of the newly added column longitudinal reinforcement is 10d.

6.The requirements for retendon planting:

6.1 the main tendons and stirrup of the original components should not be injured when the tendons are planted.

6.2, the fireproof performance of the chemical adhesive for planting steel bar should conform to the international standard. The planting bar adhesive meets the requirements of grade a glue standard, and the implantation length must meet the requirement of steel bar tension.

6.3 to detect the position of the original steel bar before planting, and not to destroy the main structure of the main reinforcement. If the original structure of the planting area is defective, it should be strengthened or strengthened and rebar can be planted in the rear.

6.4 when planting bars, the reinforcement should be welded and planted first. If there is any difficulty and must be welded afterwards, the solder joint should be more than 15d from the base concrete surface, and the wet towel with ice water immersion should be used to wrap the exposed part of the bar.

6.5: in the current temperature curing adhesive anchor 10~15 minutes gel, 24 hours later, the construction can be fully cured.

6.6 test: after three days after the glue is completely cured, the rebar can be pulled out and drawn on the spot (self inspection or by the quality inspection department). If sampling is taken, the design value of the anchor shall not be drawn to the yield value of the steel bar, because the anchor part is also needed. If the simulation test is carried out, the yield value of the reinforcement or the ultimate load of the anchor will be drawn. As long as the test results reach or exceed the design value, there is no obvious change in the hole of the anchor, and the displacement of the anchor is very small, and it is considered to be qualified.

6.7. The drying of the surrounding concrete should be ensured before the planting of the tendon.