Stressing was carried out in phases for each of the beams, which were stressed to a jacking force
of 210kN per strand.
The main advantages of this PSC girder is an ease of factory-manufacture and fabrication resulting into rapid construction, flexible choice of girder depth by adjusting initial jacking force
aside from other advantages and disadvantages.
Mammoet will supply 15,000 tonnes of jacking force
for the installation of a 50-metre long tunnel.
Then, jacking force
is applied to the thrust pipe, advancing it forward and causing it to join with the first section.
At 8,000 psi, the jacking system offers 400 tons of jacking force
and 30 percent more pressure for the IJSs.
This means that you will use smaller cranes and lifting machines, and you will use less jacking force
The project management team selected a Bohrtec BM6000LKS auger boring machine with 265 tons of jacking force
and 22,500 foot-pounds of torque along with a Theodolite guidance system to tackle the complex and intricate project.
While the first launch was for a weight of 660t with a jacking force
of 107t, the final launch was 31,400t with a jacking force
The Akkerman 240A single-stroke jacking frame can be accommodated in shafts 8 to 12 feet wide, and is capable of producing 100 tons of jacking force
, 50 tons of pullback and 10,000 foot pounds of rotary torque.
Using the Herrenknecht AVN 600 with a new lubrication system, we went 750 feet with very minimal jacking force
Intermediate jacking stations were built for the three drives longer than 250 feet to provide an additional 630 tons of jacking force
, if needed.
An interjack station was installed 60 feet behind the MTBM, and was capable of providing a jacking force
of 500 tons.