Sleeve position inspecting device and sleeve position inspecting method

A method for inspecting a position of at least one sleeve attached to reinforcing bars in a reinforcement structure before pouring concrete to the reinforcement structure to form a concrete structure, wherein the at least one sleeve form through-holes in the concrete structure, said method comprising:

• storing a BIM model of the reinforcement structure or the concrete structure, wherein the BIM model contains desired positions for the at least one sleeve in the reinforcement structure;
• setting a reference marker at a position known by the BIM model, wherein the position is near or inside the reinforcement structure;
• setting a sleeve marker on the at least one sleeve, wherein the sleeve marker represents the position of the at least one sleeve in the reinforcement structure;
• sensing the position of the reference marker using a sensing device;
• sensing the position of the sleeve marker using the sensing device;
• sensing the position of the reference marker again using the sensing device;
• determining the position of the sleeve marker in the reinforcement structure with respect to the position of the reference marker from data obtained by the sensing device;
• and
• determining whether the position of the sleeve marker is correct in comparison to the BIM model.