Interlocking Pipe Piles

Interlocking (steel) pipe piles are pile foundation support structural components consisting of SSAW (or LSAW) steel pipes and C-shaped or T-shaped interlocking connectors. Through the interlocking of these connectors, adjacent piles are mechanically interlocked to form an integrated support structure. Their core features include rigid connections, anti-displacement, and leak-proofing, making them suitable for complex pile foundation engineering scenarios such as cofferdam support, deep-water foundation construction, and excavation shoring.

When carrying out pile driving construction on interlocking pipe piles, the first step is to connect the locking buckle, and then use equipment such as vibration hammers to gradually drive them underground. Sometimes, in order to increase lubrication, butter can be applied to the locking buckle to reduce resistance and greatly improve water tightness. This pile driving method has been used in Europe for 20 years, with the advantages of no welding required, single pass pile formation, reliable waterproofing, and fast construction. If there is a higher requirement for waterproofing, concrete or cement mortar can be filled inside the lock buckle for better waterproofing effect. If you need to know more construction details, please contact us immediately.

There are three main types of interlocking pipe piles: the C9 interlock, the CT interlock and the socket-and-ball interlock. The method of connecting steel pipe piles varies significantly depending on the type of interlock used. Please see the sample images of the various interlocks below.

There are two main connection methods for C9 lnterlocking steel pipe piles: the U-shaped sheet pile connection method and the Z-shaped sheet pile connection method. As shown in the figure:

CT-type interlocking joints typically consist of C-shaped small steel tubes and T-shaped steel plates. The C-shaped small steel tubes are welded to the outer surface of the steel pipe piles, while the T-shaped steel plates are cut from I-beams and form a male-female interlocking structure with the C-shaped small steel tubes . The C-shaped component serves as the male joint, while the T-shaped component serves as the female joint; the two connect by interlocking during driving. Compared to traditional locking joints, the CT-type locking joint offers lower driving resistance, and the length of the T-shaped flange is adjustable, facilitating subsequent realignment.

Compared with other concrete pipe piles or pipe piles made of other materials, spiral steel pipe piles have many advantages:

In order to facilitate your quick selection, we have divided the mainstream standards into two categories: "preferred standards" (core recommendations) and "special operating conditions/alternative standards".

The easiest question you can ask is: "Which standard should I choose for a material with a pressure of around 350MPa? ”

Domestic conventional foundation pits/cofferdams: preferred GB/T 1591 Q345 → optimal cost, fast supply

Interlocking Pipe Piles can be used in conjunction with different filling steel sheet piles to form a steel pipe pile composite wall, to meet your different engineering needs. The dimensions of these pile materials may vary, and the following are the size tables for the two most common combination wall schemes: connection with AZ series (Z-type) steel sheet piles, and connection with PU series (U-shaped) steel sheet piles.

Interlocking pipe piles are widely used in pile foundation project scenarios such as dry docks, cofferdams, docks, flood control embankments, groundwater flow barriers, open cut supports, bridge piers, port and dock walls, bulkheads, deepwater berths, breakwaters, dock structures, container terminals, bridge foundation piles, offshore wind turbine foundation piles, high bearing building foundation piles, mooring dolphin piles, etc.  if you have any question ,please contact us now.

1. Design and Construction of the Interlocking Steel Pipe Pile Cofferdam for the Main Pier of the Shuidu Second Bridge located in Danjiangkou City