| CONSTRUCTION MANAGEMENT |
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Investment decision-making and cost recovery mechanisms of utility tunnels based on comprehensive benefit quantification |
| ZENG Guohua1, TANG Zhili1, XU Qianjun2 |
1. Beijing Jingtou Urban Utility Tunnel Investment Co., Ltd., Beijing 100027, China;
2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract ［Objective］ Urban utility tunnels can provide great benefits promoting urban modernization, technologies, intensification and resilience. However, the lack of investment decision-making constraints and fair and reasonable cost recovery mechanisms limits the sustainable development of utility tunnels. ［Methods］ This study analyzes the comprehensive costs and benefits over the entire utility tunnel life cycle with emphasis on the four categories that most affect investment decisions, namely, the government financial resources and government foresight, the comprehensive characteristics of the construction area, the specification and sequence of pipelines entering the utility tunnel, and the planning, construction and operation level. ［Results］ The utility tunnel investment decision-making model has a primary constraint condition for investment decision-making that the project must have a benefit to cost ratio greater than 1. Two kinds of cost recovery mechanisms are defined as the “proportional payment mechanism” (cost recovery mechanism for pipeline units and for the government to pay in proportion to internal and external benefits) and the “gap subsidy mechanism” (cost recovery mechanism for pipeline units to pay according to the internal benefits and for the government to subsidy the gap funds). The 19 utility tunnel projects have benefit to cost ratios concentrated between 1.50 and 3.58, reflecting significant benefits. The “proportional payment mechanism” gives an average government share of 52.3% when considering long-term internal benefits and 67.2% when considering short-term internal benefits. The “gap subsidy mechanism” that focuses on short-term internal benefits gives the average government share of 51.3%. The cost recovery mechanism based on the government gap subsidies considering short-term internal benefits shows that every 30% decrease in the entry rate during the current period increases the average government apportionment ratio by 8.8% on average. ［Conclusions］ A “two-step” implementation of the utility tunnel cost sharing policy is then developed based on the local, temporal conditions. At the initial stage of utility tunnel development, the cost is shared according to the government “gap subsidy mechanism” considering the short-term internal benefits, and at the mature stage of utility tunnel development, the “proportional payment mechanism” considering the long-term internal benefits is adopted. Finally, utility tunnel sustainable development suggestion is presented to improve the investment decision-making mechanism, to improve the entry fee and use system, and to strengthen the open source model to reduce expenditures during investment and construction by establishing regional platform companies, exploring market-oriented pilots, and other methods.
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| Keywords
utility tunnels
comprehensive benefits
quantification
investment decision-making model
entry rate
cost recovery mechanism
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Issue Date: 14 January 2023
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2023,
Vol. 63
