According to Article 12 of the Measures for Bidding and Tendering of Construction Projects, if a construction project that must be subject to construction bidding according to law is under any of the following circumstances, it may not be subject to construction bidding: it involves national security, state secrets, emergency rescue and disaster relief, or it is not suitable for bidding under special circumstances such as using poverty alleviation funds to implement work-for-work relief and requiring the use of migrant workers.
The main construction technology adopts irreplaceable patents or proprietary technologies; Investors in franchise projects selected through bidding can build their own projects according to law; Buyers can build their own houses according to law; The original winning bidder still has the contracting ability for the auxiliary secondary projects or the main storey-adding projects added in the construction process, and other commitments will affect the requirements of construction or functional support; Other circumstances stipulated by the state.
Extended data:
Relevant requirements of pile foundation engineering stipulate that:
1. Use wave theory or mechanical impedance theory to analyze the recorded results, so as to test the construction quality of pile foundation, judge the integrity of pile body and estimate the bearing capacity of pile foundation.
2. The smaller the diameter of the pile hole, the lower the side friction and bearing capacity of the pile end, and the lower the bearing capacity of the whole pile. Enlarging the diameter of the upper part of the pile hole will lead to the increase of the upper resistance of the pile, but the lower resistance can not be fully exerted, and the concrete pouring amount of a single pile will increase.
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