The pile pipe. Generally, seamless steel pipe is used, with the common specifications of pile pipe serving with 377mm, 325mm and 273mm.The surface of the pile tube should be marked with a marked scale, so as to observe the depth of penetration in the construction.(2) the pile tip. Precast reinforced concrete pile tips or flap pile tips are generally adopted (see figure 8-4-3).When precast pile tip with reinforced concrete, the bottom of pile pipe shall be thickened with steel plate to increase the contact area between the bottom of pipe and concrete pile tip step and reduce the damage degree of pile tip under the action of vibration excitation. The strength grade of concrete pile tip shall not be lower than C30, the outer diameter of pile tip shall be 20mm larger than the designed pile diameter, 500~700mm longer, and the Angle of cone tip shall be 45°~60 °.

Spiral pile Pipe

• 

  S355 Spiral Welded Steel Pile Pipe

  Standard: API, ASTM, BS, DIN, GB, JIS, API 5L, GB/T 9711.1-1997, SY/T 5037-2000. Standard2: API 5L, ASTM A53-2007, ASTM A252-1998, BS 1387, BS EN10025, BS 4568, DIN EN 10217-1-2005, GB/T 9711.1-1997, GB/T3901, GB/T9711, JIS G3454-2007, JIS G3444-2006, JIS G3441. Grade Group: 16Mn, A53-A369, Q195-Q345, ST35-ST52. Grade: 16Mn, A53(A,B), A106(B,C), Q235, Q345, Q195, St37, St52. Thickness: 5-30mm, 5~30mm. Section Shape: Round. Outer Diameter(Round): 219-3520mm. Place of Origin: Hebei, China. Application: Pile Pipe. Technique: SAW, SAW. Certification: API, ISO9001.

Longitudinal Pile Pipe

• 

  Longitudinal And LSAW Steel Pipe Piles

  Standard: API, ASTM, BS. Standard2: API 5CT, API 5L, ASTM A252-1998, BS EN10025, BS EN10217, BS EN10219. Grade Group: 15NiCuMoNb5, A53-A369, API J55-API P110, Q195-Q345, ST35-ST52, STB35-STB42. Thickness: 5.0-50mm. Section Shape: Round. Outer Diameter(Round): 219.1-1820mm. Place of Origin: China. Application: ow pressure liquid such as water, gas, and oil. delivery. Technique: SAWCertification: API.

Structure Pile Pipes

• 

  Spiral Welded Structure Steel Pile Pipes

  Standard: API, ASTM, BS, GB, JIS. Standard2: API 5CT, API 5L, ASTM A53-2007, ASTM A53M-2007, BS EN10296, GB/T 3091-2001, GB/T 9711.1-1997, JIS G3466. Grade Group: 10#-45#, 16Mn, A53-A369, Q195-Q345, ST35-ST52. Grade: 10#, 20#, 45#, 16Mn, A106(B,C), A53(A,B), Q195, Q235, Q345, St37, St37-2, St52. Thickness: 6-25mm. Section Shape: Round. Outer Diameter(Round): 219-2620mm. Place of Origin: Hebei, China. Application: fluid,oil and gas transportation, oil, gas, water pipe, pipe piling. Technique: SAW. Certification: API.

In most cases, pipe piles are filled with concrete. In some cases, pipe piles are not filled with concrete to reduce the cost. If pipe piles were not filled with concrete, then corrosion protection layer should be applied. If a concrete filled pipe pile is corroded, most of the load carrying capacity of the pile would remain intact due to concrete. On the other hand, an empty pipe pile would lose a significant amount of its load carrying capacity. Pipe piles are a good candidate for batter piles. Structural capacity of pipe piles is calculated based on concrete strength and steel strength. The thickness of the steel should be reduced to account for corrosion.

Pipe piles can be fabricated as extruded or rolled thin-walled pipe piles, spiral welded steel, extruded steel, and rolled steel (ASTM A252, Standard Specification for Welded and Seamless Steel Pipe Piles). The available size range of pipe piles and the stiffness that can be increased by increasing the pipe wall thickness has made them desirable for major bridge foundations. Pipe piles can also be driven with closed end and filled with reinforced concrete as a structural element. Depending on location, the corrosion of steel wall can be a concern and should be accounted in sizing the pipe. Typically, pipe piles greater than 1 m in diameter are open end. Driving very large 3-m-and-larger-diameter piles became available as a result of the offshore foundation construction.