Factors Affecting The Quality Of Anchor Tray Determinations

Factors affecting the quality of anchor tray determinations

(1) Environmental temperature change, due to thermal expansion, the balance of the unequal arm and other reasons, will make the balance of the zero point and the equilibrium point of change, the value of the occasional deviation can be up to a number of times the balance of the sensibility. Thus, the balance room should be a constant temperature, first-class, second-class standard balance and first and second-class laboratory balance should be 20 ℃ ± 2 ℃ under the conditions of work, the accuracy of a little lower to reach 20 ℃ ± 5 ℃. Temperature change is good not to exceed ± 0.5 ℃ / hour. After the thermostatic equipment is switched on, it is necessary to wait for the room temperature to reach equilibrium before measurement.

In order to eliminate the effect of humidity, should keep the indoor temperature and humidity is not the same, good relative humidity to keep between 50 ~ 60, generally should be between 45 ~ 75. Weighing, the measured anchor tray should be the same temperature as the room temperature, in order to defend the air disturbance and adsorption of moisture affect the results. When the anchor tray specimen temperature is higher than room temperature, the measured value is low, and vice versa is high, and can be eliminated after 20 minutes of the same temperature. For special precision balance (such as graduation value ≤ 0.002mg) should be added between the balance and the operator glass or metal partition to defend against heat exchange, but not less than the use of plexiglass or plastic panels, because they will accumulate static charge affect weighing.

(2) balance components, weights, specimens and containers, etc., the surface of the gas has always stopped the adsorption and detachment, the main one is the exchange of moisture, even if the relative humidity is low also exists, which will affect the measured value. The effect of humidity is related to the nature of the material of the weights, anchor tray specimens, balance pieces, the state of the surface, as well as the temperature and humidity of the room and other elements. Differences in right-handed equal strength threaded anchor tray has different adsorption capacity, certain anchor tray materials in different humidity adsorption of water in the case. It can be seen that when the relative humidity exceeds 80, the adsorption amount increases sharply. It is measured, a square centimeter weight surface can cause 0.1 micrograms of deviation.

1) Due to the sensitization of each accessory, the centering of the rod body is excellent, and the mortar can wrap the whole length of the anchor body, preventing the possibility of corrosion and arriving at the purpose of temporary support.

2) Connecting grouting machine: through the process of swift grouting joints to connect the end of the anchor with the selected grouting machine.

3) Combined with the supporting anchor special grouting pump and grouting process, it is the only anchoring system in China that completely dealt with many problems of traditional anchoring support.

4) Installation of grout stopper, pad and nut in the hollow anchor of rising shell.

5) Hollow planning, so that the anchor has the function of grouting pipe, preventing the mortar loss caused by the traditional construction process grouting pipe dialing out.