Comments on some constructive details

A) The formation of joints

Many attempts have already been made to form the working gaps between the slot wall lamellae by waterproofing a joint strip. These methods have generally not been effective since the joint tapes are torn out or damaged during the pulling of the mounting aids or during the excavation of the connecting element. Fig. 1.15 shows the formation of an expansion joint according to a patent of Philipp Holzmann AG. In this case, it is essential that the construction of the expansion joint has been placed in the center of a slot wall lamella and the construction parts are connected to the reinforcing cage.

Fig. 1.15 Formation of an expansion joint (source [1])

B) Prefabricated slit walls

From France there is a process, both of which are lowered into the raised slit wall wall parts (Fig 1.15). In this method, a slit is continuously lifted and supported with a bentonite cement suspension. Between the finished part and the wall of the earth, there is only a small space between 3 and 5 cm. The suspension, which is not displaced by the finished part, remains in the slot wall trench and hardens with time as a result of its cement content. Since the steel concrete parts are very long and heavy in deep walls, this method has only proved successful with shorter walls. A particular difficulty is a constructively perfect solution of the joint formation.

Fig. 1.17 Prefabricated partition wall