Steel Pipe Roofing

Interlocking Steel Pipes used in Pipe Roofs are common for excavation involving minimal disruption to major services and roads. We have seen multiple projects in Singapore implemented by Land Transport Authority (LTA) using such methods.

piperoof1

Pipe roof configuration to allow for excavation within the enclosed area.

piperoof2

Typical Interlock for connecting pipes together.

piperoof3

Interlocks welded on the pipes.

The pipes are interlocked together to form a continuous roof which prevents settlement and soil movement during excavation beneath. This process is usually installed using a Mini TBM, like that of a Herrenknecht  as one shown.

avn-tbm

AVN TBM – From Manufacturer’s Website

Sizes of these drilling holes range from approximately 600mm to as big as 1500mm.

The challenge in producing steel pipes for such projects is being able to deliver a continuous stretch of pipes (up to 100m) with the accuracy required to ensure ease in driving successive pipes when using TBM.

Mer Lion Metals have won contracts for Thomson Lines (T219, T220 and T225) in 2016 for the supply of such pipes with interlocks. We have done so by using pipes rolled by Three Rolled Bend (TRB) methods to ensure accuracy in pipe dimensions and correct welding techniques to ensure straightness of the interlock throughout the pipes. Spiral welded steel pipes are not ideal for such application as the welding method causes uneven deformation on the pipes during the interlock welding process that would cause tolerances to go beyond the acceptable conditions.

Attention to detail on the interlocks and the pipe dimensions are critical to ensuring the straightness. For pipes, we can control the tolerance of diameter up to 0.5% from the nominal value and wall thickness of up to +/-3% from nominal. In terms of straightness of either the pipes or the interlocks, we have been able to achieve up to 0.2% of length or 3mm over any 1m distance along the length of the pipes. Further to that, since tunneling always comes with space constraints, these pipes are required to be spliced on site. As such, compatibility between pipes in splicing sequence are very important as well. In order to ascertain high compatibility, all pipes are lined up on a levelled platform in the factory and checked prior to delivery to site. We do not only care about delivering high quality pipes to the site, we also consider ways of customizing our pipes to reduce works on site, by adjusting small details during the fabrication of these pipes.

img_6954

Ts and Plates Welded.

img_6961

Ts welded throughout the entire drive length.

img_6962

Plates and Slitting of the pipe.

img_6969

Welding of the plate onto the pipe.

img_6975

Laying the entire drive out for measurement testing and accuracy.

img_6981

Straightness of the slit on the entire drive of the pipes.

img_6983

Drive length being laid out up to 100m in entire length for measurement of straightness and accuracy.

img_6984

Aligning pipes for testing and measurement.

img_6985

Final inspection and checks before shipping out.

 

By collaborating with our customers, we provide customized solutions such as different length configurations, interlock adjustments, special dimension requirements for the interlocks, fabrication nozzles and other add-on features to the pipes, storage and tailored delivery schedule.

piperoof4

Installation of Nozzle into pipes.

piperoof5

Nozzle samples.

Storage in our stores for delivery.

Storage in our stores for delivery.

Contact us to find out more on how we can assist you on your pipe roofing or interlocking pipe projects.

 

Related Articles

MHZ Revetment for Karagawan River in Apayao, Philippines

MHZ Revetment for Karagawan River in Apayao, Philippines

Mlion provided MHZ sheet piles to construct a revetment in Apayao, Philippines. This project was done to control and prevent floods in the Karagawan River. It is part of an effort to rehabilitate flood mitigation facilities within major river basins and principal...

Mlion Corporation participated in PhilConstruct Luzon 2024

Mlion Corporation participated in PhilConstruct Luzon 2024

Mlion Corporation participated in PHILCONSTRUCT, Luzon in the Philippines. It was a three-day event from April 4th to 6th. During the event, Mlion shared our innovative solutions with attendees, such as our MHZ Sheet Piles, GoTagID RFID Tagging System and GoListid...

Exhibitions and Seminars at a Glance

Exhibitions and Seminars at a Glance

Mlion Corporation took part in many Exhibitions and Seminars throughout the year, conducting 16 seminars in 2023 and speaking to a total of 614 Engineers in the Philippines. We are always looking to share our expertise with industry professionals to help bring...