The rebar detector can be used to detect the spacing of steel bars and the thickness of the concrete protective layer in concrete structures and components.

Before testing, the rebar detector should be preheated and zeroed. The probe should be kept away from metal objects during zeroing. During the inspection, the zero state of the rebar detector should be checked.

Before carrying out inspections, it is advisable to understand the status of rebar arrangement in conjunction with design data. When testing, the steel wire of the steel joint box should be avoided, and the spacing of the steel bars should meet the testing requirements of the rebar detector. The probe moves on the detection surface until the thickness of the protective layer of the rebar detector is relatively small. At this time, the center line of the probe and the axis of the steel bar should coincide, and the corresponding position should be marked.

Concrete Steel Bar Structure Of House

After the position of the reinforcement is determined, the thickness of the concrete protective layer should be tested according to the following methods:

1 First set the range of the rebar detector and the nominal diameter of the steel bar. Choose the position along the axis of the steel bar that is adjacent to the steel bar that has less influence, and avoid the steel bar joints and binding wires. Thickness detection value. Repeat the test once at the uniform position of the steel bar to be tested, and read the concrete protective layer thickness test value for the second test.

2 When the difference between the thickness detection values of the two concrete protective layers read at the same place is greater than 1mm, the test data of this group shall be invalid, and the cause shall be found out, and the test shall be performed again at that place. If the requirements are still not met, the rebar detector should be replaced or verified by drilling or picking.

When the actual concrete protective layer thickness is less than the relatively small indication of the rebar detector, the method of adding a pad under the probe should be used for detection.