• Forms attached to flat surfaces are best supplied with chimneys. Chimneys allow concrete to be poured into the form and also permit the concrete to be forced into the hole by pressure applied to the chimney opening.
Place concrete underwater in accordance with the procedures described in Section 2.10. Remove form work the day after casting unless form removal would damage the newly placed concrete. The chimney projections should normally be removed after the third day, working up from the bottom; working down from the top tends to break concrete out of the repair.
Section replacement using cast-in-place concrete in open-top forms is a simpler operation. No special features are required in the form work, but they should be mortar tight when vibrated and, if possible, should give the concrete a finish similar to the adjacent areas.
Table 5-28 provides planning and estimating data for repairing concrete sheet pile structures using concrete reconstruction.
5.8.2 Tieback System Installation/ Replacement
Movement of concrete walls can be arrested by installing a new tieback system or replacing the defective elements of an existing system. This repair/maintenance technique is explained in Section 5.6.4.
Tieback system installation/replacement requires major specialized equipment and is usually carried out by shore-based construction forces.
5.8.3 Wall Load Modification
Concrete wall movement can be arrested by changing the in-place loading on the wall, which is discussed in Section 5.6.5.
Wall load modification is usually carried out by shore-based construction forces.
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