QUESTIONNAIRE SURVEYS ON THE ACTUAL CONDITIONS OF PLACING BOOMS WORK IN CONCRETE PUMPING METHOD

In this report, we conducted a questionnaire for pumping constructors to clarify the actual condition of work with placing booms. As a result, although JIS A 8612 limits the accessories that can be connected to placing booms tip depending on the shape of placing booms tip, it was suggested that the actual work depends on the construction conditions and the quality of pumped concrete than the shape of placing booms tip. In addition, equipment that exceeds JIS A 8612 limits has be often connected, which was particularly noticeable for concrete pump with long placing booms.