Steel pipe piles have the advantages of simple structure, convenient use, good sealing, high strength, and good elasticity. Therefore, they have become an important part of deep foundation projects. The service life of steel pilings is of vital importance to engineering design, cost budget, and long-term maintenance planning. The service life of pipe piles depends on many factors, and generally can reach about 30-50 years.
Steel pipe piles are foundation piles composed of steel pipes, tongues and grooves, and tenon pins. They are usually used to support and stabilize the foundation of buildings. Tubular piles overlap each other to form an arc or circle, which can be used to contain water, sand, etc., and are mainly used in offshore terminals.
①Support the weight of the building
Steel pipe piles can carry the weight of a building or other structure and transfer it to deeper levels underground, thereby ensuring the stability and safety of the building.
②Prevent soil sliding and collapse
By forming a support system embedded in the soil, steel pipe piles can prevent soil sliding and collapse, ensuring the stability of buildings or other structures.
③Cofferdam and slope protection
In coastal areas or along rivers, steel pipe piles are widely used in structures such as cofferdams and slope protection to prevent soil erosion and seawater erosion.
④Improve foundation bearing capacity
The use of steel pipe piles can improve the bearing capacity of the foundation and is suitable for situations where the soil around the foundation is loose or has poor bearing capacity.
⑤ Pull-out load bearing
Steel piling can also be used in foundation projects to resist pulling forces perpendicular to their long axis. They are especially suitable when the soil is loose or the area where the building is located is greatly affected by earthquakes or winds.
⑥Supporting structure
Steel pipe piles can also be used as supports or enclosure structures, making the foundation design more sophisticated.
In addition, steel pipe piles are also widely used in aviation, automobiles, shipbuilding, mining machinery, agricultural machinery, construction, textiles, boiler manufacturing and other fields.
(3) Characteristics of steel pipe piles
Steel pipe piles have the advantages of light weight, good rigidity, large bearing capacity, easy adjustment of pile length, small amount of soil discharge, little impact on adjacent buildings, simple joint connections, reliable project quality, and fast construction speed.
Steel pipe piles include both seamless pipes and welded pipes. The advantage of seamless pipes is that they have no welds and can be more durable. However, with the improvement of modern welding technology, economical and affordable welded pipes have become the main choice for steel pipe piles.
The service life of pipe piles is directly related to the quality of later construction. During pipe pile construction, if the pile body is tilted or cracked. This will inevitably affect the service life of the pipe pile.
The environment in which steel pipes are used is also an important factor affecting their lifespan. Humidity, temperature, corrosive media, etc. will all cause certain corrosion or damage to pipe piles. For example, steel pipe piles used in marine environments need to have good seawater corrosion resistance to prevent corrosion and damage to steel pipes.
Steel pipe piles have good rigidity, strong bending and shear resistance, and fast construction speed. Since the mid-1950s, they have been widely used at home and abroad. However, in the absence of corresponding measures, steel pipe piles are easily prone to corrosion, resulting in a decrease in the bearing capacity of steel pipe piles and thus reducing the service life of the entire structure.
Since steel pipe piles have been in a humid environment for a long time, they are particularly susceptible to corrosion. Therefore, in order to extend the life of the pipe piles, anti-corrosion measures should be taken. For example, the surface of the steel pipe piles should be coated with paint, epoxy resin, coal tar epoxy resin, etc. layer. Another method is cathodic protection, which effectively protects pipe piles from corrosive media in seawater, soil and other environments.
In order to effectively extend the life of steel pipe piles, it is necessary to conduct regular inspections on corrosion, promptly repair damaged coatings and detect the performance of cathodic protection systems.
1.What are steel pipe piles?
Steel pipe piles are foundation piles composed of steel pipes, tongues and grooves, and tenon pins. They are usually used to support and stabilize the foundation of buildings. Tubular piles overlap each other to form an arc or circle, which can be used to contain water, sand, etc., and are mainly used in offshore terminals.
(1) The role of steel pipe piles
The functions of steel pipe piles mainly include the following aspects:①Support the weight of the building
Steel pipe piles can carry the weight of a building or other structure and transfer it to deeper levels underground, thereby ensuring the stability and safety of the building.
②Prevent soil sliding and collapse
By forming a support system embedded in the soil, steel pipe piles can prevent soil sliding and collapse, ensuring the stability of buildings or other structures.
③Cofferdam and slope protection
In coastal areas or along rivers, steel pipe piles are widely used in structures such as cofferdams and slope protection to prevent soil erosion and seawater erosion.
④Improve foundation bearing capacity
The use of steel pipe piles can improve the bearing capacity of the foundation and is suitable for situations where the soil around the foundation is loose or has poor bearing capacity.
⑤ Pull-out load bearing
Steel piling can also be used in foundation projects to resist pulling forces perpendicular to their long axis. They are especially suitable when the soil is loose or the area where the building is located is greatly affected by earthquakes or winds.
⑥Supporting structure
Steel pipe piles can also be used as supports or enclosure structures, making the foundation design more sophisticated.
In addition, steel pipe piles are also widely used in aviation, automobiles, shipbuilding, mining machinery, agricultural machinery, construction, textiles, boiler manufacturing and other fields.
(2) Types of steel pipe piles
Steel pipe piles can be seamless pipes or welded pipes. In practical applications, this metal pipe is mainly made of welded pipes, including SSAW (spiral submerged arc welded steel pipe) and LSAW (Longitudinal double submerge arc welding).(3) Characteristics of steel pipe piles
Steel pipe piles have the advantages of light weight, good rigidity, large bearing capacity, easy adjustment of pile length, small amount of soil discharge, little impact on adjacent buildings, simple joint connections, reliable project quality, and fast construction speed.
