Views: 14 Author: pqwt Publish Time: 2022-11-04 Origin: PQWT
People often raise the groundwater detector how to measure the concrete ground. This time on the introduction of a simple and easy to use plastic bottle grounding electrode practice and use.
1, how to measure the cement ground with the Tiandian method groundwater detector, some drilling, some pile of soil, are very troublesome. The grounding electrode we made with waste plastic bottle works well, and the diagram measured with ordinary electrode on the land surface is exactly the same (see the above diagram).
2, cement plate is high resistance layer, with groundwater detector resistivity method measurement need to power supply to the ground, cement plate can play a shielding role, the current is difficult to flow into the ground, must drill holes to measure, and the sky electricity method does not need to power supply to the ground, electromagnetic waves only good conductive medium to it can absorb shielding, the more high resistance layer is conducive to electromagnetic wave propagation to the ground, as long as the maximum reduction of metal electrode and cement plate "contact resistance" on the line, you can not hit the hole. This is like "contact resistance" is the most important quality standard to measure the electrical switch, as long as the switch "contact resistance" qualified on the line, no need to consider the size of the resistance of other devices in the circuit. In fact, in the underground than the resistivity of the cement plate and the thickness of a lot of rock layers are countless, no impact on the sky electricity measurement.
3, groundwater detector electrode practice is very simple: with the bottom of the waste plastic bottle with the handle, filled with soil, and then the bottom of the bottle with a cloth tied tightly, from the mouth of the bottle filled with water, inserted electrodes or other metal rods, connected to the measurement wire can be.
4, in order to make the groundwater detector electrode contact resistance to maintain constant, measurement every time you move the electrode, remember to the ground after the position of a little water, if not watering the ground is easy to become dry so that the contact resistance becomes large.
5, In other hard ground, asphalt ground, weathered rock, bare rock and other ground where it is not easy to insert electrode, this electrode can be used for measurement. It should be noted that if some measurement points are on hard bare rock and some points are on a certain thickness of soil, it is necessary to prevent the possibility of low value downward transmission caused by the soil layer when reading the map (no matter what electrode has this possibility). Under such grounding conditions, it is best to replace the same position with a staggered remeasurement when remeasuring, in order to avoid the artifact caused by the uneven thickness of the soil layer as far as possible.
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