What is the difference between Class 1 piles Class 2 piles and Class 3 piles and Class 4 piles?

The first type of pile and the second type of pile refer to the pile foundation detection.

Quality. The classification of intermediate pile foundation is divided into 4 categories, as follows.

1. The pile body is complete.

2. There are slight defects in the pile-like pile, which will not affect the normal play of the bearing capacity of the pile structure.

3. The pile-like pile has obvious defects, which has an impact on the bearing capacity of the pile structure.

4. There are serious defects in the pile-like pile.

Generally, Class 1 and 2 piles mean that the pile is fine, Class 3 piles are problematic and must be treated before the next process can be constructed, and Class 4 piles must be reworked for treatment. ）

Generally, there are large and small strain and ultrasonic testing, and the most accurate and troublesome is core sampling.

Class I piles, Class II piles, Class III piles, and Class IV piles are commonly used pile foundation classifications in civil engineering, and their differences mainly lie in the design and use requirements of piles. The specific differences are as follows:

1.Class I piles: Class I piles refer to piles with high quality requirements in the design and construction process.

It is usually used for projects that bear large loads or have high lateral force resistance, such as the foundation of large buildings, bridges, port terminals, etc. The design and construction requirements are relatively strict, and detailed design calculations and safety performance testing are required.

2.Class II piles: Class II piles refer to piles with moderate quality requirements during the design and construction process.

It is usually used in the foundation, road, embankment and other works of small and medium-sized buildings. Compared with the first type of pile, the design and construction requirements are relatively simple, which can be calculated and selected by empirical formulas.

3.Class 3 piles: Class 3 piles refer to piles with low quality requirements during design and construction.

It is usually used for independent pile foundation construction, slope protection, earthwork cushion reinforcement and other projects. The design and construction requirements are relatively simple, and the pile length and diameter specified in the code are often used for selection.

4.Four types of piles: Four types of piles refer to non-load-bearing piles. They are not subjected to horizontal loads or other significant loads and are often used for auxiliary works, drainage works, anti-floating piles, etc. The design and construction requirements are relatively simple, mainly considering the corrosion resistance and durability of the pile.

It should be noted that the specific pile foundation type and classification may vary depending on the region, engineering requirements and other factors. Therefore, in the actual project, it is necessary to select and use the pile foundation according to the engineering design requirements and local specifications.

The four types of piles refer to:Pile foundation inspectionThe pile foundation that fails to pass the inspection in the process and has serious defects in the pile body.

The pile foundation detection results are divided into four categories, the first and second types of piles indicate that the pile is no problem, the third type of pile is problematic, and the next process construction can only be carried out after treatment, and the fourth type of pile must be reworked for processing.

Construction features:1. Compared with the hammering method sunk into the pile, the construction noise and vibration are much smaller.

2. It can build piles that are much larger than the diameter of prefabricated piles.

3. It can be used on all kinds of foundations.

4. The quality of construction has a great impact on the bearing capacity of the pile.

5. Because the concrete is poured in muddy water, the quality of the concrete is difficult to control.

6. It is labor-intensive and time-consuming, the hole forming speed is slow, and the mud slag pollutes the environment.

The first type of pile is the waveform law of the reflected wave, clear, no defective reflected wave, the reflection at the bottom of the pile is obvious, the wave speed is normal, the second type of pile is the basic rule of the reflected waveform, there is a weak reflected wave, but there are no multiple reflections, and the reflected wave at the bottom of the pile can be distinguished.

According to the on-site concrete pouring record, the oversealing height of bored pile concrete pouring is generally 60-80cm, and the construction technical guide of passenger and freight railway bridge and culvert engineering stipulates that the oversealing height is 50cm-100cm, although the oversealing height meets the requirements of the guide, but the highway is generally close to the lower limit, resulting in the strength of the top of the foundation pile is not pure and high, and it is also one of the reasons for the generation of the second type of highway pile.

The first type of pile belongs to the pile without defects, and the second type refers to the pile with slight defects, but can continue to be used after simple treatment, and is counted as a qualified pile. The three types of piles belong to waste piles and must be treated with certain measures.

There is no problem with a class of piles.

The second type of pile is a slight problem, but it does not affect the use, and it is also a qualified pile, if it is a third type of pile, it is a big problem, which may affect the use, and it is necessary to carry out a static load test or high strain to confirm whether it can be used.

Four types of piles, unqualified, directly fill the pile.

Class perfect pile, class good pile, class treatment pile, class scrap pile.