STRENGTHENING COMPOSITE SHEET

PROBLEM TO BE SOLVED: To provide a strengthening composite sheet suitable for strengthening a floor board， a wall surface or the like of a concrete structure such as a tunnel， a bridge pier or a building， lightweight， having a high-performance multi-layer cushioning structure and excellent in shock resistance. SOLUTION: A strengthening composite sheet 1 is formed by laminating， successively through an adhesive， a surface layer material 2， a fiber sheet 3 comprising one or a plurality of fabrics containing high strength fibers， and a buffer material 4. In this case， the surface layer material 2 is preferably a woody material， and more preferably， the fabric comprises a textile， a knitting， a nonwoven fabric， a felt or a unidirectional sheet (UD). SELECTED DRAWING: Figure 1