When the soil in shallow areas does not have sufficient strength to support the load of the structure, deep foundations can be used. Pipe piles are often used in deep foundations to transfer loads from buildings to stronger soil layers deep underground. The surface load is resisted by the surface friction and point bearing of the pile tube. Pipe piles can be driven with open or closed ends, point or plate type. If driven by slab pile, steel bars and concrete can be filled in the pipeline to improve the strength of the pile. The size range of pipe piles varies from a few millimeters to several meters in diameter, making it easy to assemble piles with a length exceeding 100 meters.

What type and grade of steel pipes are used in pile driving projects?

ASTM-A252 is the basic specification for managing seamless and welded steel pipes used for pile driving purposes. They can be used as load-bearing piles or concrete pile enclosure structures.

A-252 pipes have three grades:

Grade 1 (minimum yield strength of 30 ksi or 207 MPa);

Grade 2 (minimum yield strength of 35 ksi or 241 MPa);

Grade 3 (minimum yield strength of 45 ksi or 310 MPa).

The strongest level 3 is usually the level of pile driving engineering.

Detailed Explanation of ASTM A252 Steel Cylindrical Pipe Pile Standard

Summary

The ASTM A252 standard is a standard specification for welded and seamless carbon steel pipe piles developed by the American Society for Testing and Materials (ASTM International). This standard specifies in detail the design, manufacturing, and use of steel pipe piles, aiming to ensure the quality, reliability, and safety of steel pipe piles. It is mainly used in foundation engineering such as buildings and bridges, providing stable support for these structures.

scope of application

The ASTM A252 standard is applicable to cylindrical nominal (average) wall steel pipe piles, which can be used as load-bearing components or as shells to form cast-in-place concrete piles. It is mainly used in foundation engineering such as buildings and bridges, providing stable support for these structures.

Steel grade classification

The steel pipe piles in this standard are divided into three grades based on their strength level:

Grade 1： Has certain strength and toughness, suitable for most conventional foundation engineering applications.

Grade 2： The strength is slightly higher than Grade 1 and can also meet the needs of general foundation engineering. It is widely used in some ordinary engineering projects with high bearing capacity.

Grade 3： It is a high-strength grade steel pipe pile that can be used for foundation engineering of projects with extremely high strength or important structures such as large buildings and bridges.

chemical composition

The analysis of chemical composition is very important for ASTM A252 steel pipe piles, and chemical analysis should be carried out according to the test methods, operations, and terminology of ASTM A751. The phosphorus content in steel shall not exceed 0.050% to ensure the quality and performance of the steel. Buyers can take 2 samples from each batch of pipe piles for product analysis to ensure that the chemical composition meets the requirements.

summarize

The ASTM A252 standard provides clear regulations on various performance indicators, manufacturing processes, chemical composition, dimensional deviations, and other aspects of welded steel and seamless steel pipe piles, ensuring the safe and reliable application of steel pipe piles in foundation engineering. The ASTM A252 standard provides strong guidance and support for the design, manufacturing, and use of steel pipe piles, whether in terms of material selection, manufacturing processes, or quality standards