Abstract
Nagano wrestled with bid system reform of the public construction ahead of the whole country. One of the reforms is the switch from to general competitive bidding. As a result, it is considered that the collusion was almost removed because of decrease of the successful bid rate. But the constructer was driven into the severe management situation. So Nagano set disqualification marker price in H15 because of prevention of the decline of construction industry. In this study, I compared the construction cost in front and back of the disqualification marker revision using the construction cost investigation that Nagano carried out in H16 and that Nagano construction industry association carried out in H18.
In this study, the successful bid rate and the profit and loss rate were improved by a disqualification standard revision but the constructer still faces the severe management situation. So it is suggested to the introduction of the guaranty system to protect the person of order and of the bid bond system to protect the person of ordering.
