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Customized Milling Head Mounted On The World's Largest Pipe Jacking Machine

On May 19, 2021, the world's first largest cross-section rectangular hard rock pipe jacking machine "Tianfei 1" was delivered offline. This pipe jacking machine will be applied to the railway related embedded project of Putian railway station. It is also the first difficult project in China where multiple large cross-section rectangular pipe jacking pass through the operating railway at the same time. ——《Customized Milling Head Mounted On The World's Largest Pipe Jacking Machine》

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Product Description

Product Customizations

Customzations

The excavation section of "Tianfei 1" is 12.6m wide and 7.65m high. It adopts the combined layout of two layers, three front, four rear totally seven cutter heads. The cutting areas of adjacent cutter heads cross each other, the section excavation coverage rate is 95%, and it has stronger rock breaking capacity and tunneling efficiency. It can dig in high-strength hard rock strata and rock strata meeting 100MPa, with little disturbance to the stratum, To ensure that the safety of undercrossing the existing Hangzhou-Shenzhen railway is controllable.

It is understood that compared with shield construction, rectangular tunnel with pipe jacking construction can make more effective use of space than circular tunnel under the same cross-sectional area; In addition, when it is used for the construction of underpass such as pedestrian and vehicle, there is no need to carry out the ground paving process, which not only saves time, but also reduces the project cost. At the same time, the hard rock pipe jacking machine will also provide valuable experience for the construction of rectangular hard rock tunnels all over the world.

However, at the beginning of the project design, the pipe jacking machine with multi cutter head structure has the problem of milling blind area in the structural design. If the rock mass in these blind areas cannot be milled synchronously, it will not only affect the whole tunneling process of the pipe jacking machine, but also cause additional costs due to secondary milling and excavation.

Therefore, the leaders of China Railway contacted Yichen company in the hope that Yichen could provide a solution to the problem of milling blind area of pipe jacking machine. In this case, Yichen designed and manufactured two kinds of milling modules for customers by using its R & D strength and many years of practical experience, which effectively solved the problem of milling blind area of the world’s largest pipe jacking machine.

One module we call it a shell rotary milling head, which is developed based on Yichen’s vertical drum dutter. Its shell and the milling head are an integrated structure. They rotate at the same time when working. The spiral blade is conducive to transporting the excavated waste to the rear. They solved the milling blind area of the upper and lower edges of the "Tianfei 1" pipe jacking machine.

Custom Designed Milling Head
Item	Parameters
Item	Type 1	Type 2
Max Power Output	150 kW	200 kW
Max Flow	200 L/min	300 L/min
Recommended Flow	150-180 L/min	200-250 L/min
Pressure	320 bar	350 bar
Output Torque	32000 Nm@320bar	50000 Nm@320bar
Output Shaft Speed	40 rpm@40L/min	30 rpm@40L/min
Weight	850 kgs	1200 kgs

Customzations

The other one is the milling drum, which is installed on both sides of "Tianfei 1" pipe jacking machine. It is used for milling and excavating the rock mass in the blind area on both sides of the pipe jacking machine.

Custom Designed Milling Drum
Item	Parameters
Max Power Output	200*2 kW
Max Flow	200*2 L/min
Pressure	≤350 bar
Motor Displacement	2*125cc
Deceleration Ratio	1:50
Max Output Torque	69600 Nm@350bar
Rated Torque	62000 Nm@315bar
Max Output Shaft Speed	32 rpm@400L/min
Rated Output Shaft Speed	28 rpm@360L/min
Linear Velocity	1.3
Length	600-2500 mm

Customzations

"Tianfei 1" pipe jacking machine can complete the milling and excavation of the whole square surface at the same time after it is equipped with a shell rotary milling head and a milling drum designed and manufactured by Yichen. It has solved the problem of cross-section rectangular pipe jacking machine construction blind area, reduced the construction cost, and laid a solid foundation for the completion of Putian railway station project on schedule.

——《Customized Milling Head Mounted On The World's Largest Pipe Jacking Machine》

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