The dynamic probe test is used to determine the penetration resistance of soil. To carry out this test, a few apparatus are required. The primary equipment needed for the dynamic probe test is the dynamic probe itself. This probe consists of anvils that are firmly fixed to a guide rod. The lower anvil is also firmly fixed to extension rods. The mass of the lower anvil should be within the range of 1.5 kg to 1.8 kg. Additionally, the combined mass of the anvils and guide rod must not exceed 5.0 kg.
Another apparatus required for the dynamic probe test is extension rods. These rods should have a length of 1000 mm ±10 mm. The rods are attached to each other using external couplers, ensuring they bear against each other. These extension rods are crucial to penetrate the soil during the test.
Procedure for dynamic probe test:
In conducting a ground test, the probe must be placed on the ground at the test location, with the first extension and guide rods positioned vertically. The hammer used for the test must be allowed to fall freely from a stationary position in the upper anvil, without being connected to any object that may affect its acceleration and deceleration. The fall distance must be 300 mm ± 5 mm.
The probe must be driven into the ground using the hammer at a driving rate between 20 and 60 blows per minute. Additional extension rods may be added as necessary, and each time a rod is added, the screw joints must be rotated clockwise one full turn to ensure tightness.
During the test, the blow count for every 100 mm of penetration must be recorded, or at refusal, the distance of penetration for 50 hammer blows must be noted. Any interruption exceeding 5 minutes must also be recorded.
If the probe encounters any obstruction that cannot be penetrated over 100 mm by 100 blows of the hammer, the test must be terminated, and the probe must be considered to have reached refusal.
The following is reported after the test:
The given context is already in the form of paragraphs. Therefore, it cannot be rewritten in paragraphs. However, I can provide a summary of the given context:
The context describes three pieces of information related to a test. The first piece of information is about the blow count for every 100 mm penetration or at refusal the penetration distance for 50 blows of the hammer. The second piece of information is about interruptions exceeding 5 minutes during the test. The third piece of information is about recording the dynamic probe test in accordance with the code.