1 construction difficulties of water conservancy pumping station
1. 1 poor construction environment.
Because water conservancy projects need to control and utilize water resources, including water resources near rivers and mountain streams, the construction environment directly increases the construction difficulty of water conservancy pumping stations and requires higher construction technology. In particular, there is a lot of groundwater in the construction site of water conservancy projects, which makes the geological environment soft and has no high strength to bear the pressure brought by buildings. Therefore, the foundation construction of pumping station should be treated accordingly to avoid the hidden dangers of quality and safety brought by the construction environment.
1.2 construction is difficult.
The construction of water conservancy pumping station includes the installation of mechanical and electrical equipment such as pumps and the construction of buildings. Because of its strong functionality, it also has higher requirements on construction quality. The construction of pumping stations needs certain professionalism, so the required construction standards are strict and difficult. The construction standard of water conservancy pumping station is high, the construction environment is relatively poor, the existing construction technology still has some defects, and the cooperation of departments is not good, which increases the difficulty of pumping station construction.
2 Analysis of construction technology of water conservancy pumping station
2. 1 cofferdam construction
Hydraulic engineering is the control and utilization of natural water resources, but the distribution of natural water resources is scattered, which is not convenient for direct control and has a great impact on the construction of pumping stations. Therefore, at the beginning of pumping station construction, the first task is cofferdam construction. The main function of cofferdam is to improve the construction environment, provide certain convenience for the construction of pumping station, and greatly improve the construction safety. Cofferdam construction is the foundation of pumping station construction, so it is necessary to strengthen the construction process and weir filling construction. First of all, we should carry out construction design according to the requirements and standards of water conservancy projects, carefully investigate the construction site environment, consider the terrain and water level, and formulate a careful construction plan to lay a good foundation for cofferdam construction. Secondly, the selection of construction technology must be carried out in strict accordance with the engineering marks to ensure the strength and construction safety of the cofferdam. When filling the weir, the filler is compacted by mechanical layers to ensure the design strength.
2.2 Foundation pit supporting construction
Because of the poor geology of the pumping station construction site, it is necessary to do a good job in foundation pit support. In the strength of foundation pit support, it is necessary to ensure sufficient bearing capacity and avoid the quality problems of pumping station caused by excessive settlement. In actual construction, steel sheet piles can be used for reinforcement. In the selection of reinforcement materials, steel plates are required to have high strength, especially bearing capacity, which must meet or exceed the design standards to avoid the development of construction accidents due to insufficient bending capacity. At present, single pile piling is often used in foundation pit support, and the axis is measured with tools, and then piling construction is carried out after the position is determined. Pile pulling in foundation pit support is also a key project, which is usually carried out after culvert or exit retaining wall is completed. There are several technical control points in pile pulling construction: First, in the process of shaking the pile head of steel sheet pile with pile driver, the time should be controlled within 1-2 minutes, and the soil around the steel sheet pile will be loosened by shaking to reduce the friction generated by the pile. Second, the pile pulling process should be carried out slowly. If it is difficult to pull out, the pile pulling operation should be stopped immediately.
2.3 diversion and dewatering construction
In the construction of pumping stations, hydrogeology has a great influence on the construction quality. In general, the drainage gate of the pumping station should be set at the position where the buried depth of the groundwater level reaches114-115m, and the aquifer area where it is located should have enough water and thick sediment concentration. Secondly, it is the choice of diversion mode. The diversion mode should be selected by combining the strong discharge and diversion of the pumping station.
2.4 Earthwork Construction
In the construction of pumping station, foundation earthwork needs to be excavated. According to the actual demand of the pumping station, the earthwork quantity and construction scheme are planned in detail. During earthwork construction, attention should be paid to layered excavation, and at the same time, the distance at the bottom of earthwork should be marked in time to reduce unnecessary overbreak. At the same time, attention should be paid to the earthwork transportation after excavation, so as to ensure the smooth transportation route and avoid the construction delay caused by transportation problems. The other is the timely backfilling of earthwork, mainly to avoid soaking the building due to rainfall and other problems. When backfilling earthwork, the thickness of each layer should be strictly controlled to reduce the water content of backfill soil, so as to ensure the sufficient strength of the pumping station foundation.
2.5 concrete construction
As a common building material, concrete plays a vital role in ensuring engineering quality, especially in the construction of pumping stations. Concrete construction is the key to improve the strength of pumping station. The requirements for concrete in pumping station engineering are also strict. In the proportion of concrete materials, the proportion of concrete should be adjusted according to the actual needs of water conservancy projects to ensure the strength and reduce the cost. In actual construction, it is necessary to clean the construction site to avoid mixing some sundries in concrete. There are too many sundries, and the concrete can't reach its due strength. In addition, attention should be paid to the problem of water accumulation in the construction site, including rainfall and water flow in the formwork. At present, the main construction technology is layered continuous casting. During construction, the progress of each layer should be consistent, generally within the range of 1 m, and the construction time interval of each layer should be controlled within two hours. When pouring concrete, it is necessary to assist with vibrating rods to ensure the uniformity and strength of concrete. The most important work is to check the formwork and steel structure. When these structures are loose, it will seriously affect the quality of the project and bring security risks to the construction.
3 Measures to strengthen the quality control of water conservancy project pumping station construction
3. 1 Strengthen the construction and management of pumping stations
In the process of pumping station construction, it will be affected by weather, manual operation errors and other factors, and it is easy to meet the construction standards. Therefore, construction management must be strengthened, and when illegal operations or unqualified engineering standards occur, they should be promptly urged to solve them, so as to fundamentally reduce the existence of potential safety hazards. We should also improve the management system, promote the cooperation between departments based on the construction quality, and make the construction of pumping stations scientific and reasonable.
3.2 Strengthen the maintenance of mechanical equipment on the construction site.
Construction technology depends on the cooperation of mechanical equipment. Therefore, in the construction of water conservancy pumping stations, it is necessary to do a good job in the maintenance of mechanical equipment, and timely repair problems to avoid safety accidents caused by mechanical failures. Regular maintenance of equipment can keep the construction process of pumping station going smoothly, effectively shorten the construction period and save the construction cost. At the same time, the equipment needed for the pump station is well maintained to ensure the smooth operation of the water conservancy pump station after the construction is completed, and then the smooth completion of the pump station construction work is realized.
4 conclusion
The construction of pumping station is an indispensable project in water conservancy projects, and it is also the basis to realize the utilization of water resources. Therefore, the construction technology of pumping station is selected to ensure that the quality of pumping station fully meets the construction standards of water conservancy projects. The construction of water conservancy pumping stations is difficult, and the geological environment will also have a certain impact on the construction of pumping stations. Therefore, it is urgent to upgrade the existing pumping station construction technology, strengthen construction management, do a good job in the maintenance of construction equipment, avoid potential safety hazards in pumping station construction, fundamentally ensure the construction quality, realize the ultimate value of water conservancy project construction, and make certain contributions to China's economic construction and development.
I believe that after the above introduction, everyone has a certain understanding of the construction technology of pumping stations in water conservancy projects. Welcome to Zhong Da for more information.
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