Object of the Invention: This invention relates to a catwalk which is installed along the side of upper swing structure of construction machine such as large hydraulic excavator. When the upper structure swings at construction work, the end of longer side of the catwalk is susceptible to damage by hitting with materials like piled mud near the machine. The object of this invention is to provide a catwalk which prevents the damage effectively, and has stable walkway, and also provides simple structure for lower manufacturing cost and easy use. Outline of the Invention: With reference to Fig. 1, catwalks (16, 17) are installed on both sides of construction machine (2). Catwalks (16, 17) are symmetrical. Features will be explained to the catwalk (16) by referring Fig. 2 also. The catwalk (16) which is installed along the side (6a) of upper swing structure (6) of construction machine (2) has a movable portion (18) at most outer end (H) from swing center (X). The movable portion (18) is installed around axis (Y) which locates near the side (6a) of swing structure (6), and is installed to rotate between horizontal and upper positions. When the movable portion (18) hits with materials like piled mud (S), it rotates upward (Z2) and prevents damage.La présente invention concerne une passerelle installée le long du côté de la structure oscillante supérieure d'un engin de chantier, tel qu'une grande excavatrice hydraulique. Lorsque la structure supérieure oscille lors de travaux de construction, l'extrémité du plus long côté de la passerelle peut être endommagée par des impacts avec des matériaux comme un tas de boue à proximité de l'engin. L'invention concerne une passerelle qui empêche efficacement les dégâts, comporte un passage stable et fournit également une structure simple à un faible coût de fabrication et qui soit facile d'utilisation. Par rapport à la figure 1, des passerelles (16, 17) sont installées de chaque côté de l'engin (2) de chantier. Les passerelles (16, 17
