First, an overview of water conservancy project construction
First of all, water conservancy projects are similar to traditional building projects, especially in construction methods, construction objects and related construction equipment. Secondly, the construction of water conservancy projects is special, and water conservancy projects will be affected by temperature, pressure and water quantity for a long time. Therefore, this point must be fully considered in the actual construction and reasonable measures should be taken for effective construction treatment. Finally, the strong seasonality of water conservancy project construction leads to many influencing factors, including not only water temperature and water level, but also weather changes and dry season, which will directly affect the normal operation of construction work.
Second, the key points of water conservancy project quality control
1. Key points of pile foundation construction
For water conservancy project construction, the most basic construction is pile foundation construction. Pile foundation construction technology mainly includes measurement and positioning, opening, sliding hole, concrete pouring and reinforcement cage construction. Surveying and positioning is the most basic work in the key points of pile foundation construction. After pile foundation positioning, measuring and setting out, supervisors must confirm and evaluate the site in time. In the construction, it is necessary to comprehensively design the accuracy of the construction in combination with the relevant construction technical standards and hole location design and construction. In the process of drilling, check and control the verticality and center position of drilling in real time. According to the exploration report, the construction personnel recorded the hole depth of the bearing stratum, and combined with the drilling tool size and suspension tightness, conducted patrol inspection and recorded the rock stratum.
Observe the response of drilling rig during drilling in bearing stratum and interface, compare the scientificity and rationality of rock samples after the test, and judge the penetration depth of rock to ensure the depth of pile foundation construction in bearing stratum. The main purpose of pile foundation construction in hydraulic engineering construction is to maintain the safety and stability of the whole construction process and promote the overall construction. In the process of engineering drilling, the control accuracy is particularly important. It is necessary to comprehensively detect and adjust the verticality and flatness of the grinding disc and correct the deviation value in time. After drilling, the relevant construction personnel should lift the drill bit to the position of 80- 100m at the bottom of the hole for idling, so as to ensure that the dilution can be completed under the condition that the hole wall is safe. When the hole wall is safe, the initial dilution of mud is realized, and the new mud with the specific gravity of 1.05- 1.08 is recycled, and the recycling time is generally 40-60 minutes.
Reinforcement cage construction is generally segmented construction. During construction, it is necessary to ensure the staggered welding of steel bar joints, and pay attention to the vertical welding of reinforcing cage to ensure that the reinforcing cage is perpendicular to the hole and enters the hole. When lowering the reinforcing cage, it must be lowered slowly, and forced lowering is prohibited. Reinforcing cage is to weld the upper end and casing firmly, and then slow down the resistance of concrete rising at the top to prevent the reinforcing cage from rising. When pouring concrete, the slump of concrete must be strictly checked to ensure that the slump is between 180-220mm. In the process of lowering the reinforcing cage, the concrete pouring quantity should also be calculated according to the force balance method, so as to ensure that the conduit can buy more than 1m of concrete after the first concrete pouring, and then cut the iron wire and bury it in the waterproof plug. Lower the reinforcing cage, complete the concrete pouring, and ensure that the buried depth of concrete in the conduit is between 2 ~ 2 ~ 6m, and the specific value can be avoided by accurate measurement.
2. Do a good job in environmental protection during construction.
In the construction of water conservancy projects, environmental protection is a very important link. To strengthen environmental protection, we must first prevent water conservancy construction from affecting people's lives. We must take effective measures, formulate a perfect environmental protection plan in combination with the actual situation, protect the construction area and living area in a targeted manner, and avoid interfering with residents' lives. At the same time, it is necessary to arrange professionals to clean up garbage and pollutants. Secondly, it is necessary to effectively protect the water quality in the construction area and avoid causing great pollution and influence on the water quality. The production wastewater in construction production must be settled by grit chamber, and the settled mud must be cleaned regularly, and then sent to the slag factory for unified treatment to avoid environmental pollution.
3. Strengthen the construction quality management
In the construction of water conservancy and hydropower projects, the most important link is the construction link, and effective measures must be taken to improve the construction link and carry out comprehensive control. It is necessary to educate the construction workers on the legal system and enhance their legal awareness. Moreover, it is necessary to establish and improve the management system of water conservancy and hydropower construction, comprehensively and effectively control the links before and after, and ensure the effective implementation of the management system. In the process of construction, we must strengthen the effective management of people, things and equipment environment, reduce the influencing factors of construction and continuously improve the construction quality. In the construction, in order to carry out the construction in strict accordance with the drawings, it is necessary to improve the construction work of hidden links and ensure the construction quality of hidden links. In the process of construction, materials must be strictly managed and the quality must reach the standard, and there can be no Jerry-building.
Water conservancy and hydropower engineering is one of the important links in China's construction industry. Therefore, it is necessary to carry out reasonable construction design work in combination with the actual engineering conditions and address conditions to ensure the quality control of each link in the construction, thus ensuring the overall construction quality.
The above are collected and sorted by Zhong Da Consulting Company.
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