The Cld-3 Static cone penetration tester is a device used for geotechnical engineering surveys. It can measure parameters such as the specific penetration resistance of soil. Here is an introduction to its general usage:

Preparation

1.Site preparation:

• Clean the test site and ensure that the ground is flat, solid, and free of obstacles and debris so that the probe can be placed stably and operate normally.
• Measure the approximate size of the site and ensure that there is enough space around for equipment installation, operation and personnel activities.

2.Equipment inspection:

• Check whether the main unit, probe, reaction device, measurement system and other components of the probe are complete and intact, and whether the connection is firm.
• Check the sensitivity and accuracy of the probe, which can be calibrated and debugged according to the method in the instrument manual.
• Check whether the oil level of the hydraulic system is normal and whether there is any leakage, and ensure that the hydraulic pump, oil pipe and other components are working properly.
• Check measuring instruments, such as sensors and recorders, to ensure that they can display and record data normally.

Install equipment:

• Place the probe main unit at the pre-selected test position, adjust the level, and use a level to calibrate to ensure that the main unit is in a horizontal state.
• Install the reaction device. According to the site conditions and test requirements, select the appropriate reaction method, such as anchor reaction, heavy object reaction, etc., and ensure that the reaction device is firmly installed and can provide sufficient reaction force.
• Connect the probe to the main unit, and use a dedicated cable to connect the probe to the measurement system of the main unit to ensure reliable connection and normal signal transmission.
• Install measuring instruments, such as displacement sensors, pressure sensors, etc., and debug and calibrate them so that they can accurately measure and record relevant data.

On-site test

Set parameters:

• According to the test requirements and site conditions, set relevant test parameters on the main unit or recorder, such as penetration speed, measurement interval, etc.
• Generally, the penetration speed should be controlled at about 1.2m/min, and the measurement interval can be selected according to the soil layer conditions and test accuracy requirements, usually 10cm or 20cm.

Start penetration:

• Start the hydraulic system and slowly apply pressure to make the probe penetrate the soil at a uniform speed. During the penetration process, closely observe the data display on the host and recorder to ensure the normal collection of test data.
• Pay attention to the stability of the penetration speed to avoid too fast or too slow speed affecting the accuracy of the test results. At the same time, pay attention to the working status of the probe, such as whether there is abnormal vibration, jamming and other phenomena.

Data recording:

• According to the set measurement interval, automatically or manually record the various data measured by the probe, including cone tip resistance, side wall friction resistance, pore water pressure, etc.
• Record data accurately and clearly, and record relevant information such as test time and depth for subsequent analysis and processing.
• During the test, if you encounter abnormal conditions or data mutations, you should record the depth, phenomenon and other information at the time in time, and analyze the possible reasons.

Lifting the probe:

• When the probe penetrates to the predetermined depth, stop penetration and slowly lift the probe to separate it from the soil layer.
• During the lifting process, also pay attention to observe the changes in data and record the relevant data when the probe is pulled out.

End work

Cleaning equipment:

• After the test, turn off the power of the hydraulic system and measuring instruments, and remove the connecting cables and measuring instruments.
• Clean the dirt and debris on the probe and the main unit to keep the equipment clean.
  Remove the reaction device and other components and keep them properly.

Data processing and analysis:

• Transfer the recorded data to the computer and use special data processing software to organize and analyze it.
• Draw various curves based on the test data, such as the cone tip resistance-depth curve, the side wall friction resistance-depth curve, etc., to analyze the stratification and physical and mechanical properties of the soil layer.
• Write a test report based on the analysis results, and give the engineering characteristic parameters and related suggestions of the soil layer.

Equipment maintenance and storage:

• Carry out comprehensive inspection and maintenance of the equipment, such as replacing worn parts, adding lubricating oil, etc., to ensure that the equipment is in good working condition.
• Store the equipment in a dry and ventilated warehouse to prevent the equipment from moisture, rust and damage.