Patent ID: 7857083

Claim:
An excavation machine comprising: an upper rotation body having a lower part, wherein the lower part comprises a front end and a rear end; a vehicle body frame extending from the front end to the rear end of the lower part of the upper rotation body, the vehicle body frame comprising: a floor part having an inner face; a rear part having an inner face; and a counterweight formed at the rear part; an engine mounted to have a space from the inner face of the floor art of the vehicle body frame and from the inner face of the rear part of the vehicle body frame; and an additional weight, which is formed in an L-shape in side view with a vertical part and a horizontal part, wherein the additional weight is placed at the horizontal part thereof in the space between the engine and the inner face of the floor art of the vehicle body frame, and is placed at the vertical part thereof in the space between the engine and the inner face of the rear part of the vehicle body frame.