hollow bar

Ischebeck TITAN Hollow Bars®

The Roots of a Tree – A Model For Us

It was the image of a mighty tree that guided us. The tree has a network of large and small roots that support it and anchor it in the soil, without the need for a concrete foundation. The roots resist the vertical and horizontal static and dynamic forces, acting on the tree and transfer them to the ground. The tree can withstand wind, snow and earthquakes. The roots interlock with the soil, bond with it to create a monolithic root ball composed of roots and soil, and thus a composite material. How the tree “calculates” the size of the root system it needs for its stability remains largely a mystery to us. The tree teaches us how to build with the soil, how to use it sparingly, how to improve it and reinforce it. This new way of thinking about foundations was recognized by Dr. F. Lizzi as long ago as 1952. He called his Micropiles “root piles” (pali radice)

TITAN Hollow Bars® as Micropiles – Our System

The TITAN Hollow Bars® system is a tubular grouted pile in which the tendon is installed directly with a sacrificial drill bit while using a cement suspension as drilling and flushing fluid. The tendon used in Micropiles is a steel tube in compliance with ASTM A-615. It functions as sacrificial drilling rod, injection pipe and reinforcing bar (3-in-1). In contrast to the earlier method known, where a casing is used to prevent the drilled hole from collapsing in, for instance, loose soil or boulders, the TITAN Hollow Bars® system uses a drilling fluid (cement suspension) to stabilize the drilled hole according to FHWA NHI-05-039. This renders an additional casing unnecessary and saves operations in the drilled hole. In many cases this leads to higher productivity during installation compared with systems employing a separate casing. Another advantage of direct drilling and simultaneous flushing/grouting with a cement suspension (dynamic grouting) compared with a casing is the mechanical interlock between the grout body and the soil. This enhanced shear bond results in higher load-carrying capacities and less settlement. Displacement at the head of the pile is generally in the order of magnitude of a few millimetres.

TITAN Hollow Bars® represent an equivalent but economic alternative to pre-stressed permanent anchors. It is a tubular grouted pile. However, depending on the application, they are also known as injection piles, composite piles, anchor piles or soil nails.

The hollow steel tendon is driven to the required depth by means of rotary percussive drilling. The drilling fluid injected via the drill bit automatically stabilizes the drilled hole. An additional casing is unnecessary, there is no need to insert a separate steel tendon or extract a casing.

The hollow steel tendon is used to fill the drilled hole starting at its deepest point, i.e. from the bottom up. This guarantees the drilled hole is completely filled, including all fissures and crevices. No additional injection hoses are needed. Multi-stage grouting is unnecessary.

The hollow steel tendons can be readily cut to any length to suit cramped site conditions or limited overhead clearance. The continuous thread guarantees that a thread is available at every point for coupling, prestressing, etc.

Ischebeck TITAN Hollow Bars® come in different sizes from 1.2 inch to 7.7 inch outer diameter. The load bearing capacity ranges from 42.7 kips to 1453.4 kips.

We have the following products range;

    • TITAN 30/16, TITAN 30/11 (German non-domestic)
    • TITAN 40/20, TITAN 40/16 (US domestic & German non-domestic)
    • TITAN 52/29 (non-domestic), TITAN 52/26 (US domestic)
    • TITAN 73/56 (non-domestic), TITAN 73/53, TITAN 73/45, TITAN 73/35 (US domestic)
    • TITAN 103/78 (US domestic), TITAN 103/51, TITAN 103/43 (German non-domestic)
    • TITAN 127/103 (German non-domestic)
    • TITAN 196/130 (German non-domestic) wall thickness of this hollow can be customized.

Ischebeck Titan produce a huge number of accessories like drill bits, headplates, spherical collar nuts, spacers, couplers and much more.


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