To add protection. when construction, migrant persons should be banned walking through it in order to prevent the anchoring reinforcement steel bar that has not been solified being loose.
This project selects”xx brand” planting bar adhesive, inspecting the materials before the construction.
Checking the production date of the product carefully and calculating the due date.
Opening the box to see whether the color of adhesive changes and has the precipitation or hardening; checking the product certificate of construction materials and factory inspection report,etc.
When it is necessary, choosing a kind of specification of the steel bar to experiment implanting. after solidification, doing the damage experiments.
Testing equipment:hollow jack, high pressure oil pump, pressure sensor. test data: doing the drawing test according to the steel yield value or testing value that the design provides.
Doing it after 72 hours of implanting the steel bar ,extracting 1%from the same specification ,same model and the same parts of the planting bar. , and not less than three. the parts of the drawing test should be similar to the parts that need to implant bar. but don’t do drawing test on the parts that don’t need to implant bar. Drawing value achieves the yield strength value of the steel bar.
d(mm) 12; 16; 20;
d.(mm) 15; 20; 25;
L(mm) 180; 240; 300mm;
The specification of the commonly used steel bar, the length of the anchorage and the corresponding requirements of drilling hole diameter.
Diameter of the steel bar d.(mm) diameter of the drilling hole d.(mm) depth of the drilling hole L.(mm)
12mm; 15mm; 180mm;
16mm; 20mm; 240mm;
20mm; 25mm; 300mm;
Depth of hole in accordance with the requirements of the design drawings, not less than 15d and conform to the requirements of the drawing test.
Testing equipment:hollow jack, high pressure oil pump, pressure sensor. test data: doing the drawing test according to the steel yield value or testing value that the design provides.
Doing it after 72 hours of implanting the steel bar ,extracting 1%from the same specification ,same model and the same parts of the planting bar. , and not less than three. the parts of the drawing test should be similar to the parts that need to implant bar. but don’t do drawing test on the parts that don’t need to implant bar. Drawing value achieves the yield strength value of the steel bar.
Matters needing attention when implanting the steel bar
When drilling and implanting the steel bar, we need to strictly follow the technical specification of concrete structure strengthening to construct.
before implanting the steel bar, we should check the planting bar adhesive and other materials. the particular way is: implanting a group of steel bar according to the technological requirements and procedures, drawing after solidifying. when drawing, we should observe the conditions of structural adhesive at any time. when the drawing value arrives at the design value of steel bar, adhesive surface has no distortion, crack or displacement(or minimal displacement), when arriving at the yielding point, steel bar deforms, pressure gauge has no pressure falling(but also think it qualified even if the structural adhesive would be pulled out, because at this moment the sticky power is greater than the design strength value)
For the original planting bar, if it has conditions, it also can do sample drawing inspection. But drawing strength value can only reach the design value. because if it is over strength value, steel bar is easy to be damaged. at this moment the stress of steel bar in the component does not exist.
Combustible materials, when constructing, it is necessary to stay away from fire.
