Reservoir risk removal and reinforcement project cost management?

In recent years, small and medium-sized reservoirs have played an increasingly important role in my country's water conservancy industry. While increasing investment, the quality and safety of the reservoirs have been guaranteed to a certain extent, which has a certain impact on agriculture. play a positive role in its development. However, in terms of cost control, there are still many problems. How to take cost control measures for reservoir risk removal and reinforcement projects is particularly important. Project Overview

Nanhe Reservoir is located in Chenwan Village, Liuhou Town, Yicheng City, Hubei Province. It intercepts Nanhe River, a tributary of Man River, and is 50km away from Yicheng City. Xiaonanhe Reservoir is a medium-sized reservoir mainly used for irrigation, but also has comprehensive benefits such as flood control and water supply. The original designed total storage capacity of the reservoir is 31.64 million m3, with an active storage capacity of 2,586 m3 and a dead storage capacity of 540,000 m3. The designed irrigation area of ??the reservoir is 38,000 acres, and the effective irrigation area is 30,000 acres.

The main contents of the reservoir risk relief and reinforcement project include: dam reinforcement project (dam upstream slope protection project, dam crest project, dam downstream slope leveling, new drainage system), spillway reconstruction, transportation Water tunnel reinforcement projects, new observation projects, etc.

Because this Xiaonanhe Reservoir risk removal and reinforcement project is controlled by national investment policies, the project investment is only 13.55 million yuan. Compared with medium-sized reservoir projects of the same scale, the construction investment funds are about 20 million yuan less. Around this time, the construction unit’s winning bid price was very low. During the construction process, the price of the main sand and gravel materials increased sharply, which made it extremely difficult to control the construction cost. As a result, the early progress of the project was seriously delayed, and the opinions of all parties involved in the construction were very different. Later, Through the joint efforts of all parties, various cost control measures were adopted to enable the project construction to be successfully implemented.

Reasonable use of investment funds

1. Change the location of the traffic bridge

Due to historical constraints, the Xiaonan River Reservoir construction was not fully implemented in accordance with the planning plan in the initial stage. Some supporting projects failed to be constructed. According to the initial planning plan of the reservoir, a cross-spillway traffic bridge with an investment of approximately 800,000 yuan should be built on the downstream side of the spillway. After consultation with all parties, it was considered that a local "village-to-village" road would be used to build an investment bridge downstream of the dam. The traffic bridge across Laohegou is about 200,000 yuan, which can fully meet the functions required by the planning plan and can greatly save project investment.

2. Provide diesel generators to construction units to reduce the cost of erecting transformers

Since the spillway is far away from the dam, the dam transformer cannot be used, and there are few spillway concrete construction projects. , and the cost of erecting an additional transformer was obviously not cost-effective. The owner solved the construction power problem by providing diesel generators to the construction unit, saving the cost of erecting a transformer to increase its capacity.

3. Gradually arrange construction funds according to "first the main body and then the secondary"

Due to large historical debts, limited investment funds, and many projects to be built, in order to strive to ensure the completion of quality and quantity According to the investment budget, the construction unit requires the construction team to rearrange the construction schedule and gradually arrange construction funds in accordance with the principles of ensuring the dam reinforcement effect, ensuring the appearance of the spillway, and appropriately allocating funds to improve the environment of the reservoir management office.

The supervision unit strengthens the on-site construction quantity visa and controls the additional items outside the contract

1. Strengthen the on-site construction quantity visa

(1) Conduct the construction quantity according to the construction location For visas, except for earthwork projects, the construction unit must declare the project quantities according to the construction parts, and the unfinished parts are not allowed to declare the project quantities, thus simplifying the completion settlement work and improving the accuracy of the settlement work.

(2) Clarify measurement standards and standardize measurement procedures. The upstream slope protection of the dam was renovated using mortar block stone. Since the dam was built with weathered stone in the early stages of construction, the cost of the renovation was high and the effect after the renovation was not obvious. In particular, it was difficult to control the measurement standards. For this reason, the supervision unit recommended that the design unit change the upstream mortar masonry slope protection to cast-in-place concrete slope protection. The use of cast-in-place concrete slope protection will have a beautiful appearance, facilitate measurement, and save project investment.

2. Control additional projects outside the contract

(1) Save money by rationally adjusting the design and compensate the construction unit for the cost of the dam construction platform and guide trough. According to A.8.2 of the water conservancy project bill of quantities pricing specification: the guide trough and construction platform for underground diaphragm wall construction shall be measured and priced separately. The anti-seepage wall construction platform and guide trough of this project are not included in the bill of quantities in the bidding document. Therefore, the construction unit proposed to the construction unit to compensate for the cost of the construction platform and guide trough.

Generally, the concrete anti-seepage wall of a dam creates holes at the location of the original clay core wall. After consulting the old drawings of the Reservoir Management Office, the supervision unit found that the reservoir dam was a clay dam, and suggested that the design unit make the dam concrete anti-seepage wall. The axis of the seepage wall is translated 2m upstream so that the axis of the concrete anti-seepage wall coincides with the axis of the upstream concrete wave-proof wall, which can reduce the amount of construction platform and grass planting work, and the guide wall of the anti-seepage wall can be used as the anchor of the concrete wave-proof wall. foundation, and at the same time, the infiltration line is lowered in advance. After calculation and adjustment of the axis of the concrete anti-seepage wall, the investment can be completely balanced.

(2) According to the construction contract and actual site conditions, reasonable compensation will be provided for digging drainage ditches for temporary roads and leveling the construction site. Although the temporary road of this project is included in the project list, due to the frequent rainy weather during the construction period, the construction unit has repeatedly urged the construction period. It is necessary for the construction unit to take measures to dig drainage ditches for the temporary road and level the construction site, and the effect is very good. It is obvious and ensures that the dam anti-seepage wall is completed on schedule.

(3) Strictly control unreasonable requests such as supplementary exploration. After the dam cutoff wall was moved 2m upstream, the construction unit carried out pilot work on the dam cutoff wall in order to ensure the construction quality of the cutoff wall. For the geological exploration work of the hole, the construction unit proposed to the construction unit a request for compensation for supplementary exploration expenses.

Construction units should take measures to reduce construction costs

1. Actively eliminate social conflicts. After the construction unit entered the site, local villagers requested the supply of sand and gravel and the transportation of earth and stone at prices higher than the market price. With the support of the construction unit, the villagers were reasonably compensated for their land occupation and insisted on using their own machinery for construction, gradually eliminating the unreasonable demands of some villagers.

2. Reduce investment in temporary construction projects. In 2010, southern China suffered a century-old drought, causing water shortages for people and livestock. According to the requirements of the Yicheng City Prevention Office, in order to ensure water supply and irrigation in Liuhou Town, the water level of the reservoir has not been reduced to the dead water level in accordance with the diversion plan during the tender. Although the project list includes the construction of a cofferdam upstream of the water pipeline, the actual water depth of the reservoir during construction reached 20-30m, and the cost of building a construction cofferdam was high. The Water Conservancy Bureau required that the working gate must be replaced. After convening a special meeting to study, it was determined: Use the upstream inlet inspection gate to block water, replace the inlet working gate and outlet working gate, and only need to replace the tie rod for the inlet inspection gate. The construction unit set up a full hall of scaffolding in the entrance shaft to hoist the steel plates, then used sandbags to weigh down the water and successfully replaced the entrance working gate.

3. Strengthen design changes

The original design of the downstream slope foot of the dam was dry stone slope filtering. Since all local quarries have been closed during the construction, the block stones must be Go to Xiangfan or Yuyang to buy, and the transportation distance is about 100km. According to the unit price of dry stone, it is a serious loss. After suggestions to the design unit, the dry stone slope filtering should be changed to six-square slope protection.

Strengthening the dynamic management of project cost

1. Due to technological progress, process improvements and the adoption of new construction methods, the originally measured physical consumption will change. Through dynamic management, regular Or conduct surveys from time to time to ensure that the measurement is consistent with reality. In addition, prices often change under market economy conditions, and it is necessary to continuously adjust the published prices in order to prepare an estimate of the project cost during the design stage. The pricing basis used in estimates, estimates, and budgets, as well as the calculation and control of project costs, are based on time changes and market changes, and can adapt to objective actual trends, thereby controlling the actual project cost within the allowable error range of the expected cost. , and ensure that the project price is fair and reasonable.

2. Actively promote and apply electronic computers for scientific management, vigorously develop and promote the application of various quota software and engineering quantity calculation software, and use computers to establish various databases, including price information of working materials machines, various Types of work material machine consumption, material price index and cost index provide a basis for dynamic management of project costs while improving work efficiency.

3. Implement dynamic management of project costs, break the boundaries of professional division of labor, eliminate obstacles in all links and departments during the construction process, enable all employees to participate in cost control of the construction process, and clarify cost management personnel and accounting personnel Collaborative relationships with statisticians and other professionals, timely communication, and information separation enable project cost management to run through the entire process of construction operations and management activities, thereby effectively controlling project costs.

Conclusion

To sum up, the cost control of water conservancy projects mainly lies in the decision-making stage, design stage and construction stage. During these stages, we strive to make reasonable use of manpower, material resources, and financial resources in water conservancy project construction projects, so that they can be optimally allocated to achieve better investment benefits and social benefits.

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