Loan in the first year =10000 * 60% * 30% =180,000 yuan.

The loan in the second year =10000 * 60% * 50% = 30 million yuan.

Loan in the third year =10000 * 60% * 20% =12 million yuan.

The first year loan interest =1/2 *1.800 * 8.24% = 741.6 million yuan.

The interest in the second year = (1800+74.16+1/2 * 3000) * 8.24% = 2,780,300 yuan.

Interest in the third year = (1800+74.16+3000+278.03+600) * 8.24% = 3,503,800 yuan.

Interest during the three-year construction period = 74.16+128.03+350.38 = 7,025,700 yuan.

Construction investment 107025700 yuan.