Custom-Fabricated Interlocking Pipe Piles for Combi-Wall Design

Interlocking Pipe Piles Detail

AGICO supplies full-size interlock pipe piles for various pipe-pile combi-wall designs for worldwide piling projects.

Standards: ASTM A252, API 5L, EN 10219-1 GB/T 700；GB/T 1591

Pipe Type: SSAW Pipe, LSAW Pipe

Interlock Type: Larssen Interlock, ball and socket interlock

Diameter Range: 200 mm – 3000 mm

Wall Thickness: 2.5 mm – 40 mm

Length: according to customer requirements

Surface Treatment: hot-dip galvanizing, epoxy coating, etc

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What is an Interlocking Pipe Pile?

Interlocking pipe piles are a type of tubular pile produced for pile foundation projects of deep foundations and harbors. They are always used together with steel sheet piles as the combi wall system, while interlocking pipe piles offer load-bearing capacity as the foundation piles, and steel sheet piles function as the retaining wall. The interlocking pipe pile wall withstands pressure from soil, water, and sand on one side, allowing the project on the other side to proceed smoothly.

The production of interlock pipe piles includes 2 steel parts: interlock connectors/corner piles and steel pipe. AGICO supplies interlock pipe piles, mainly produced with welded pipes (SSAW & LSAW), in a wide diameter range. Seamless pipes are rarely used due to their higher cost and limited diameter range. The most common interlocks welded onto the base pipes are Larsen interlocks and ball-and-socket interlocks.

CT Type Interlock — C9 Corner Pile Interlock

Interlocking Pipe Pile from AGICO
Pipe piles with interlocks supplied from AGICO are available in a variety of Asia, European and American steel standards, They are made from a wide range of steel grades, from carbon steel to high-strength steel, and can be customized in various thicknesses to meet specific design requirements.
AGICO pipe piles have been thoroughly used in many wharf walls and floating structures in Asia, and our pipe piles are used in more fileds of foundation engineering and construction piping, industrial pipelines, communications infrastructure, and machinery.

Interlock Types for Pipe Pile

The welded interlock types for pipe pile are designed the same as steel sheet piles, which include the following types:

Larssen Type: This interlock type is compatible with Larssen sheet piles, and widely used in combi-wall piling system.
CT Type: A C-shaped lock is vertically connected to one side of the steel pipe, while a T-shaped lock is vertically connected to the other side.
Ball and Socket Interlock: This interlock is specially designed high-performance mechanical joints for connecting large steel pipe piles, which can have certain degrees of angle rotate.

Interlocking Pipe Pile Steel Grades

Considering the size and cost, pipe piles are produced with SSAW pipe, and the diameter can reach up to 3000 mm. Besides the Chinese pipe pile standards of GB/T 700, GB/T 1591, GB/T 12470, AGICO also supplies international standards of ASTM A252, API 5L, and EN10219-1, etc. Since API is the standard for the oil industry, it has strict production requirements with higher performance, which is adopted in the fabrication of pipe piles with interlocks.

API standard covers grades: B, X42, X46, X52, X56, X60, X65 up to X70 and X80.
The steel grades for pipes and piles specified in EN 10219-1 include S235JRH, S275JOH/J2H, S355JOH/JEH, S420MN, and S460MH.

Common Interlocking Pipe Pile Standards Table

Standard	Common Steel Grades	Typical Applications	Notes
ASTM A252	Grade 1, 2, 3	Building foundations, bridge piles, harbor structures, marine piling	Most widely used pipe pile standard
API 5L	Gr.B, X42–X80	Offshore piles, wind turbine monopile sections, port structures	High performance; commonly used in marine piles
EN 10219-1/2	S235JRH, S275J0H, S355J2H	Building piles, temporary piles, structural supports	Can be used as piles; more common is EN 10210
EN 10210-1/2	S235JRH, S275J0H, S355J2H	Building foundations, bridge piles, marine structures	Stronger and more reliable than EN 10219 for piles
API 5CT	J55, K55, L80, P110	Offshore wind foundations, temporary piles	Not a pile standard but occasionally used
ASTM A500	Grade B, C	Light-duty piles, small foundations	Used in light structural piling
ASTM A53	Grade A, B	Small-diameter piles, temporary works	Lower performance compared with A252
ISO 3183	L245–L555	Offshore piles, marine/port structures	International equivalent of API 5L

Mechanical Properties of Pipe Pile

Strength Level	ASTM	API / GB 9711	EN 10219 / 10210	GB/T 1591
~250 MPa	A252 Gr.1	—	S235	—
~300 MPa	A252 Gr.2	API X42	S275	—
~350 MPa	—	API X52 / L360	S355	Q345
~415 MPa	—	API X60 / L415	S420	Q390–Q420
~450–460 MPa	A252 Gr.3	API X65	S460	Q460

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Interlocking Pipe Pile with C9 Corner Pile — Interlocking Pipe Pile Welding Process

Our Capacity & Advantage

AGICO owns pipe pile production lines with large production capacity, which can fabricate pipe piles of various dimensions for the construction of deep foundations, wharf walls, cofferdams and trestle bridges. The maximum length of the interlocking pipe pile could be up to 100m, with a customized pipe diameter. Choose steel grades of Grade B to X80, S235 to S460 for pipe piling production. Our welding machine offers SSAW pipes with large thickness.

AGICO has more than 12 years of exporting experience in steel sheet and pipe piling products. We have cooperated with large construction companies and design institutes, and can fully understand and satisfy your requirements. AGICO delivers the pipe piles along with the c9, c14 corner piles, customers will be able to install them at the site.

Interlocking Pipe Piles Sizes According to Combi Wall Design

Interlocking pipe piles can be used together with the different infilled steel sheet piles to form pipe pile combi walls to satisfy different requirements, and their sizes may differ, here are the size charts for the most common combi wall designs: connection with AZ series (Z Type) sheet piles and PU serie (U Type)sheet piles. If you are interested in purchasing interlocking pipe pile or sheet piles, AGICO can also offer customized fabrication service according to your drawing.

Pipe Pile Size Chart of Combi-wall (AZ Serie / Z Type Sheet Pile)

Pipe Pipe Dimensions		Infill Sheet Piles Double AZ18-700
Diameter	Thickness	Width	M100%	I	W
mm	mm	mm	kg/m2	cm4/m	cm3/m
711	10	2171	150	86698	2439
	12	2171	166	98531	2772
	14	2171	181	110159	3099
813	10	2273	154	112751	2774
	12	2273	172	129852	3194
	14	2273	189	146695	3609
914	10	2374	158	144510	3162
	12	2374	177	167991	3676
	14	2374	195	191157	4183
1016	12	2476	182	214016	4213
	14	2476	202	244795	4819
	16	2476	221	275202	5417
1219	14	2679	212	378870	6216
	16	2679	234	428149	7025
	18	2679	256	476933	7825
1600	18	3060	279	932011	11650
	20	3060	305	1029827	12873
	22	3060	330	1126894	14086
1800	18	3260	290	1243339	13815
	20	3260	316	1375132	15279
	22	3260	343	1506029	16734
2000	20	3460	326	1777489	17775
	22	3460	354	1947882	19479
	24	3460	382	2117233	21172
2200	21	3660	350	2345823	21326
	23	3660	379	2560881	23281
	25	3660	408	2774744	25225
2500	21	3960	363	3186179	25489
	23	3960	393	3479998	27840
	25	3960	424	3772384	30179

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Pipe Pile Size Chart of Combi-wall (PU Sheet Pile)

Pipe Pile Dimensions		Infill Sheet Piles Triple PU18
Diameter	Thickness	Width	M100%	I	W
mm	mm	mm	kg/m2	cm4/m	cm3/m
711	10	2571	157	77612	2183
	12	2571	170	87604	2464
	14	2571	183	97423	2740
813	10	2673	160	100114	2463
	12	2673	175	114656	2821
	14	2673	190	128978	3173
914	10	2774	164	127753	2795
	12	2774	176	134848	3235
	14	2774	195	167673	3669
1016	12	2876	184	188187	3704
	14	2876	201	214684	4226
	16	2876	217	240862	4741
1219	14	3079	210	333326	5469
	16	3079	229	376204	6172
	18	3079	248	418650	6869
1600	18	3460	270	827536	10344
	20	3460	292	914044	11426
	22	3460	314	999889	12499
1800	18	3660	279	1110548	12339
	20	3660	303	1227937	13644
	22	3660	327	1344528	12499
2000	20	3860	313	1596226	15962
	22	3860	338	1748961	17490
	24	3860	363	1900763	19008
2200	21	4060	335	2117496	19250
	23	4060	361	2311366	21012
	25	4060	387	2504159	22765
2500	21	4360	347	2896465	23172
	23	4360	375	3163328	25307
	25	4360	403	3428890	27431

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Interlock Pipe Pile Application

Interlocking pipe piles are large-diameter steel pipe piles fitted with welded sheet pile interlocks, they are used to form continuous retaining wall systems, or act as king piles in combi-wall systems. The welded interlocks allow the pipe piles to connect with conventional sheet piles (U-type, Z-type, or hat-shaped) to create a high-strength, low-permeability retaining structure.

Concrete-Filled Steel Pipe Piles

Interlocking pipe piles are widely used in deep excavation, marine engineering, and port terminals, where both structural capacity and water cut-off performance are required.

Interlock pipe pile can be used directly or can be filled with (C30–C50) concrete after the piling, which is decided by the role of steel pipe piles. For most projects, if the piling structure is a permanent project and pipe piles are used as the foundation piles that bear heavy loads, then they shall be filled with concrete. If it is only a temporary project or functions only as a retaining member, concrete fill is not necessary. Concrete fill is used for extra bending strength for large retaining heights and reduced deformation under lateral earth and water pressure.

King Piles in Combi-Wall Systems

Interlocking pipe piles are used singlely or together with U/Z sheet piles:

Port quay walls
Bulkhead walls
Deep-water berths
Breakwaters
Jetty structures
Container terminals

Structural Foundation Steel Pipe Piles

Pipe-Pile-Application-Structural-Foundation-Piles

Structural foundation pipe piles with concrete fill shows better compressive & tensile capacity, overall stiffness (Ec + Es composite action), buckling resistance.

Bridge foundation piles
Offshore wind turbine foundation piles
High-capacity building foundation piles
Mooring dolphin piles

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