Underwater reinforcement by drilling and planting bar
Technological process of underwater reinforcement of drill-planting bar Bullet line positioning → drilling → washing → glue → planting bar → curing maintenance → pull-out Test → reinforced concrete.
Technological process of underwater reinforcement of drill-planting bar
Bullet line positioning → drilling → washing → glue → planting bar → curing maintenance → pull-out Test → reinforced concrete.
1. Positioning of the elastic line
According to the design diagram of the location and number of reinforcement, staggered the original structure of kg position, marking the location of the rebar. Please check the relevant departments, after passing the drilling.
Drilling with impact drilling, drill diameter should be greater than the diameter of the steel bar about 5mm, steel bars selected φ25 steel production, the drill bit selection of φ30 alloy steel drill. Depth size 15d (375mm), the actual drill depth 400mm. The drill is always perpendicular to the cylinder.
3. Washing hole
The washing hole is the most important link in the planting bar, because after drilling the hole will have a lot of ash powder, ash slag, directly affect the quality of the implant bar, so be sure to clean up the debris in the hole. Method is: With the Heineken brush (this brush does not drop hair), put on a long stick, extend to the bottom of the hole, back and forth repeatedly twitch, dust, slag, and then compressed air, blowing out the hole in the dust. After blowing, use absorbent cotton or alcohol or scrub the wall. But can not use water to scrub, because alcohol and * * volatile, water is not easy to evaporate. After scrubbing with water, the hole will not dry quickly. After the drilling and cleaning, please design and other relevant units for acceptance, qualified after the plastic injection.
4, Plastic injection
Hui Fish brand Strong bar adhesive is a two-component dedicated finished product, take a group of strong rubber, loaded into the sleeve, placed to a dedicated manual * *, slowly pull the plate machine, the removal of platinum at the mouth of the thinner liquid waste, and then the spiral mixed mouth into the hole, such as the length is not enough to use plastic tube lengthened, and then pull the plate machine, plate machine hole move once * * Step back so that the air in the hole can be discharged. In order to make the rebar implanted in the hole with full gel, and can not make the plastic fluid outflow, hole injection to 80% can be. The hole should be planted immediately after filling the rubber.
5, planting tendons
In the plastic before the beam bottom template has been good, easy to implant bar positioning. Before planting the rebar, the steel wire brush is used to brush repeatedly, remove rust, and then use alcohol or clean. After filling in the hole, the rust-treated rebar is immediately put into the hole, and then slowly and one-way into the reverse, not midway reversed, until the reinforcement into the hole bottom.
6, Curing Maintenance
After the reinforcement is implanted, it can be positioned on the bottom plate of the beam, and the rebar cannot be vibrated until the strength of the tendon is cured completely.
The strength of the rubber at room temperature can be cured, 50h after the next process can be constructed.
7, testing test
Before planting the steel bar construction, must carry on the field drawing test to the reinforcing bar and the rebar glue, in order to determine whether the steel bar and the rebar glue meet the design requirement.
The method is: making the concrete specimen with the same strength grade as the concrete member with the reinforcement site, according to the step of planting bar, implanting 3 groups of rebar, and after the reinforcement is cured, the pull-out experiment is carried out. The experiment uses the special steel bar dynamometer, when the Afterburner achieves the Ⅱ grade steel bar Yield strength (450n/mm2), appears the necking phenomenon, then pulls off.
The force applied to the fixture in the test shall be in accordance with FC≥FYK (FC: Force exerted by dynamometer, N/mm2;fyk: yield strength of rebar, n/mm2)
The test results show that the strength of the rebar is greater than the yield strength of the steel bar, and the failure of the rebar is the yield failure of the steel bar, not the bond failure of the adhesive, which indicates that the rebar and the rubber are qualified.
Non-destructive pull-out test was carried out to detect the quality of rebar in working condition, and the number of tests was 10% of the total number of implants.
In the test, the force exerted by the dynamometer is less than the yield strength of the steel bar, and the Anchorage force value is designed by the design department. The formula is: Fm<>
After the test test is qualified, the next procedure can be carried out.
8. Reinforcement, formwork, pouring concrete
After the tensile test is qualified, the reinforcement, formwork and pouring concrete can be started by the construction drawing.
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