Years of experience in steel rust removal construction: the bonded steel bar has four practical methods of steel rust removal: chemical rust removal, sand blasting rust removal, water knife rust removal, special steel bar rust removal and manual rust removal.
The rust removal of the tied steel bar is also called in-situ rust removal of the steel bar. Because the tied steel bar can not be removed and the common rust removal things can not enter the steel cage, it is difficult to remove the rust of the steel bar. How to remove the rust of the tied steel bar depends on the degree of the corrosion of the steel bar and the requirement of the rust removal of the steel bar.
Generally speaking, the lightly corroded bonded steel bars can use chemical rust removal method, that is, direct spraying (special things) of steel bar rust removal agent can be, spraying along the steel bar when spraying. The severely corroded steel bars need to be pretreated and then sprayed with steel rust remover. The pretreatment methods include manual rust removal of special things for steel bar rust removal, sensational rust removal of mud pump, super high pressure water gun rust removal and other pretreatment methods.
Generally speaking, sandblasting is the best way to remove rust for heavily corroded bonded steel bars. Sandblasting rust removal is the use of high-pressure air generated by the air compressor as power, the use of sand striking, friction to remove the steel bar surface rust slag. There are many equipments needed for sand blasting and rust removal of reinforcing bars, such as screw air compressor, air storage tank, sand tank and connecting high-pressure pipe, wear-resistant high-pressure sand tank and sand blasting gun head. Moreover, sand blasting and rust removal have high requirements for operators, which require certain operating experience or they are prone to safety accidents, and there are more operators (generally more than three people) with higher labor costs. In addition to the high cost of sand blasting rust removal, there is also serious pollution. Now the strict environmental inspection generally can not be sand blasting rust removal, but sand blasting rust removal effect is good (sell very good), relatively speaking, the safest method of steel bar rust removal.
Generally speaking, the method of removing rust by water knife is suitable for the steel bar which has been bonded with severe rust. After cleaning by water knife (over 700 kilograms of ultra-high pressure water), the steel bars with severe corrosion are basically clean, and most of them are corroded, including oxide skin. This method of rust removal has high investment (equipment is more than 80,000 yuan), high power consumption (90 kW), and is dangerous (hit the disabled immediately), and can not participate in construction without professional training. But this method of removing steel bar rust is very safe. It does not damage the appearance of steel bar as sand blasting does. It basically does not damage the steel bar. The only disadvantage is that there will be dead angle just like sand blasting.
Generally speaking, the bonded steel bars, regardless of the degree of corrosion, can use the three super steel bars for rust removal. Rebar rust removal items are handled by each person (generally 6 workers are matched with 1 administrator, and rust removal items are corrected in time). The unit power is low, but the overall power is high, especially in the case of contract work.
In-situ rust removal of bonded reinforcing bars requires removal of formwork, especially sand blasting and water knife. If the formwork can not be removed and rust removal can only be carried out by using reinforcing bar rust removal agent, but the spraying materials used for reinforcing bar rust removal are special or customized. Special parts such as wall bars and column bars need to be sprayed with two or three meters elastic spraying rod for reinforcing bar rust removal agent, and preferably at night. Special parts such as steel bars need to be PRE-RUSTED and sprayed with reinforcing steel rust remover after rust removal, otherwise the effect of rust removal is not ambitious, because the reinforcing steel bars used are disc or disc snails, disc snails and disc steel bars occur high temperature during straightening, chemical rust removal of Corroded Reinforcing steel bars after high temperature is very difficult, and it is necessary to spray reinforcing steel rust remover after polishing. Rust.
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