Work plan verification device

A work plan verification device that includes a boom telescopically formed and horizontally turnably and derrickably provided on a vehicle body of a crane and that is used to move a suspension load suspended from a tip end of the boom through a rope,

• the work plan verification device, comprising:
• a boom-derricking cylinder provided between the vehicle body of the crane and the boom and that derricks the boom;
• a cylinder pressure sensor attached to the boom-derricking cylinder and that detects a pressure of the boom-derricking cylinder;
• a boom length-sensor attached to the boom and that detects a length of the boom;
• a derrick angle sensor attached to the boom and that detects a derrick angle of the boom;
• an image creator that creates an image when viewing a lower portion from the tip end of the boom;
• a monitor that displays the image;
• a movement position inputter in that an operator indicates a movement position of the suspension load on the image displayed on the monitor;
• and
• an arithmetic part that determines whether the movement position is indicated on the image and that acquires a three-dimensional coordinate position of the movement position, the three-dimensional coordinate position corresponding to the movement position indicated on the image, when it is determined that the movement position is indicated on the image,
• wherein the arithmetic part calculates a total rated load based on the acquired three-dimensional coordinate of the movement position and determines whether the suspension load is suspended from the boom based on a change amount in the pressure of the boom-derricking cylinder acquired from the cylinder pressure sensor or a change amount in the derrick angle of the boom acquired from the derrick angle sensor,
• when the suspension load is suspended from the boom, the arithmetic part calculates an actual load of the suspension load based on the pressure of the boom-derricking cylinder acquired from the cylinder pressure sensor, the length of the boom acquired from the boom-length sensor and the derrick angle of the boom acquired from the derrick angle sensor and calculates a load factor which is a ratio of the actual load to the total rated load, and displays the load factor on the image,
• when the suspension load is not suspended from the boom, the arithmetic part determines whether a virtual load is input into the movement position inputter and calculates a load factor which is a ratio of the virtual load to the total rated load when the virtual load is input, and displays the load factor on the image.