Diaphragm walls (soft eye)
There are many construction techniques when it comes to tunnels, among which the cut and cover (open pit) or the more traditional bored tunnel methods. Out of these techniques, the one that makes use of a tunnel boring machine (TBM) is widely spread and supposes the construction of reinforced concrete launch box and extraction shaft.
Although well adapted to boring through concrete, the TBMs are not well-suited to work their way through a steel reinforced concrete structure because of the resilience of the steel. The presence of this kind of reinforcement will seriously hinder the work of the rotary cutters because of its ductility, absorbing the cutter’s energy and deforming instead of allowing them to fracture the concrete as they’re supposed to.
With the product V•ROD of Pultrall...
To work around these obstacles the diaphragm walls (Soft Eye), where the V•ROD composite rebar will be used locally in the area where the TBM will be going through the reinforced concrete wall, have been developed. The elastic to rupture behaviour of V•ROD allows the TBM to bore through the so reinforced concrete structure without presenting any more resistance than what would be experienced when boring through rock or unreinforced concrete.
The ultimate result, a reinforcement pattern that exhibits minor differences when compared to the steel version and a greatly improved work schedule since the demolition step needed with steel reinforcement is no longer required. In brief, using V•ROD will translate in important savings.
The Solution for Corrosion!
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V•ROD rebar does not rust, even in the harshest environments. It does not react to salt, chemical products or the alkalinity present in concrete.
V•ROD rebar does not create a thermal bridge within structures.
She is almost 4 times lighter than steel rebar. It is much easier to handle and, in most cases, one truck load will be sufficient to carry the rebar required on an entire project.
V•ROD rebar offers a level of thermal expansion comparable to concrete due to its 80% silica content.
V•ROD rebar does not contain any metal; it will not cause any interference in contact with strong magnetic fields or when operating sensitive electronic instruments.
V•ROD rebar produced by pultrusion offers a tensile strength that can reach more than five times that of steel.
V•ROD rebar can be delivered at the right time and in the exact quantity needed at the site. Various specifications such as the length of straight bars as well as angles and led lengths of special bent sections are prepared in the plant.