The construction of water conservancy projects is more and more closely related to the national economic development and social security and stability, so the construction quality of water conservancy projects is very important. Concrete construction as an important link in the construction of water conservancy projects, the quality of concrete construction affects the overall construction quality of water conservancy projects. Therefore, it is especially important to improve and innovate the concrete construction technology. This paper is a study and analysis of the current concrete construction technology of water conservancy projects.

1 Water conservancy project concrete construction technology problems

1.1 easy to appear frost swelling, cracking problems

In the water conservancy project some frost swelling, cracks appear due to the constraints of the external environment caused by the pouring process of concrete materials due to the location of the concrete material is located on the harder material, which leads to the concrete in the process of hardening due to the impact of external pressure, their own elastic modulus is reduced, resulting in changes in the state of tension, thus creating cracks. Concrete is affected by external pressure and naturally by internal pressure. The internal influence is generated in the process of concrete material casting, because the volume of the material is relatively large, resulting in the internal heat in the process of emitting the surface temperature is lower than the internal material temperature, which leads to the concrete in the expansion process will be subject to internal pressure, resulting in stress changes caused by cracks. Therefore, in the construction process, the concrete will be caused by the temperature change and the change of the internal and external tensile force, which leads to cracks.

1.2 Concrete is susceptible to erosion and carbonation

In the construction of water conservancy projects concrete is also susceptible to erosion, carbonation, these problems arise due to the different natural environment, the natural water and air containing trace gases destroy the passivation film on the surface of the reinforcing steel, resulting in corrosion of the reinforcing steel, which leads to the erosion of concrete, resulting in the weakening of the compressive capacity of concrete and the emergence of safety risks.

1.3 Concrete is susceptible to wear and tear problems

In addition to frost swelling, cracking, erosion, and carbonation, concrete will also have problems with wear and tear. Concrete is subject to wear and tear regardless of the environment, only the degree of wear and tear varies. Concrete works in the vicinity of water, it will be subject to the impact of water for a long time, so that the sand and gravel in the water and water flow and other super-speed flow on the concrete to produce a huge impact, a long time of huge impact will destroy the smoothness of the concrete surface, making the steel exposed, so that the problem of abrasion, cavitation.

2 The improvement method of hydraulic engineering concrete construction technology

2.1 Quality assurance from construction materials

The quality of construction materials is an important basis for ensuring the quality of concrete construction. Concrete is a mixture of a variety of raw materials, traditional concrete is a mixture of water, sand, cement and stone. Nowadays, with the development of society and the continuous progress of technology, there are more and more types of concrete, and the material safety of concrete is also getting more and more attention, so it is very important to choose the right concrete raw materials and ingredients with the actual situation of the construction site and environmental and geographical conditions during construction. In the selection of raw materials, the type of construction building and the local geographical conditions must be considered, so as to select the appropriate concrete strength grade. In the process of construction, the ease of concrete, fluidity, cohesiveness and water retention should be carefully controlled. In addition, the local climate conditions and temperature changes during construction should be combined to make appropriate adjustments to the construction to prevent frost damage, cracks and other phenomena.

2.2 Improvement of concrete construction technology

In order to ensure the safety of water conservancy projects, the construction technology of concrete should also make corresponding adjustments and improvements. Before the concrete is poured, the elevation and size of the formwork to be used should be carefully checked, and detailed data records should be made for each item checked. When special weather conditions are encountered during the construction process, some cement mortar should be filled in the bottom before the concrete is poured. When pouring concrete, in order to avoid the phenomenon of segregation it is necessary to ensure uniform and continuous vibrating of concrete. During the process of concrete placement, it is necessary to avoid movement or deformation of the components so as to ensure the quality of concrete construction. In order to ensure the integrity of the placed concrete, it is necessary to shorten the interval as much as possible to ensure that the concrete is within the initial setting time. Therefore, it is necessary for the construction unit to have professional and high-level construction personnel and advanced construction equipment. When pouring construction joints, special attention should be paid to the old and new concrete combination, is the best combination of old and new concrete to ensure the integrity of the concrete, reduce the air bubbles in the concrete, enhance the density and uniformity of concrete.

2.3 Regular maintenance of water conservancy construction

After the concrete is poured, the maintenance of the concrete building is also an important part of ensuring the quality and safety of water conservancy projects. Therefore, the relevant departments should do a good job of maintenance management in a timely manner. Strictly in accordance with the relevant standards, the temperature and humidity of the slow-setting soil is effectively controlled, and to ensure sufficient maintenance time. If the relevant departments can not meet the requirements of the standard specification due to the conditions, the actual situation can be more economical maintenance management, in order to achieve the most ideal maintenance effect.

To ensure the safety of water conservancy projects is an important part of the construction of water conservancy projects, and concrete construction technology is closely related to it. In order to reduce or even avoid the construction of technical problems and some other problems affecting the quality of the project, it is necessary to constantly improve and innovate the concrete construction technology, only to improve the concrete construction technology to ensure the quality of construction and economic benefits of water conservancy projects.