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hdpe flange
1. Bottom slab: High-density polyethelene (HDPE) bentonite sheet
was recommended. This sheet is a laminate of three materials:
high-density polyethelene sheeting, chemically modified bentonite,
and a spun polypropylene overlay.
2. Top slab: Liquid-applied rubberized asphalt was recommended.
HDPE bentonite sheet was also recommended.
General Tunnel Construction
The portion of the Central Artery system that is the subject of
this report is a cut-and-cover tunnel structure that employs SPTC
(Soldier Pile Tremie Concrete) walls as the vertical sidewalls
of the tunnel. These walls have been commonly referred to as "slurry
walls" because their construction utilizes placement of a
viscous material known as "slurry", that has a specific
gravity greater than water, into the excavated space to prevent
the intrusion of water and soil prior to the introduction of concrete.
The height of the slurry walls extends from street level in Boston
down as much as 120' where they are embedded into rock. The strength
of the walls derives from heavy, 36" deep, steel I-beams
that are employed as soldier piles. These piles, which are embedded
in rock at their base and serve as the support point for the tunnel's
floor and roof framing, are the vertical members that carry the
weight of the tunnel components down to the foundation. They also
are the members that give the slurry wall its strength and stiffness
to withstand lateral earth and hydrostatic loads. The piles are
spaced between four and six feet apart depending on the location.
The space between the piles is filled with concrete. The slurry
wall thickness is nominally 42" and is intended to provide
3" of concrete cover over the surface of the pile flanges.
 Please Contact Us to discuss your hdpe flange
needs. You design it, we build it.
hdpe
flange
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