Advantage analysis of water conservancy construction?

After the installation of synovial membrane device and the acceptance of side-impact bracket, concrete pouring construction should be carried out. Before construction, there should be strict requirements on the quality of concrete mixture, and at the same time, the amount of additives should be controlled during mixing, so as to better ensure the slump and construction quality of concrete during construction. Try to use a smaller slump during construction to avoid concrete flowing out during pouring. In the process of construction, the transportation platform and crane used in the construction should be kept horizontal during transportation to better ensure the quality of concrete. At the same time, it is necessary to avoid the situation of directly hitting the skateboard when dumping, and to prevent the problem of concrete distribution. Synovium construction technology In the construction, the method of pouring concrete is thin-layer pouring, so that the thickness of each layer should be well controlled during pouring, and at the same time, when vibrating concrete after pouring, the skateboard should be put down, which can better ensure the pouring effect. Pay attention to the filler when pouring, to avoid over-filling, and clean the top surface of the side formwork in time after pouring. Because the construction technology of synovium adopts thin layer paving, it is necessary to keep the ground moving very slowly during construction, and at the same time control the distance of skateboard when moving. In the process of advancing, time intervals should be carried out, which can better improve the quality of synovial membrane construction. In the process of synovial membrane construction, sliding may stop under special circumstances. In this case, the time should also be controlled, so as to better ensure the construction quality. In the process of construction, it is necessary to measure the penetration resistance and verify the field production situation, so as to better control the slump of the mixture in concrete under certain construction conditions and also control the sliding speed range of the synovium.

Application Analysis of Slipform Construction

As for the slipform construction of mass concrete, as early as 1970s, some gravity dams and arch dams with a height of 10m were constructed by slipform at home and abroad. However, for high concrete dams, slipform construction is difficult to meet the requirements of temperature control, so it has not been popularized. With the popularization and application of cantilever formwork, slipform construction is rarely used in mass concrete now. The concrete lining construction of long inclined shaft with large inclination and large diameter can be said to be the most difficult project in underground engineering of hydropower station. The traditional formwork support method can't meet the requirements of construction period, quality and safety. Engineers at home and abroad have been exploring efficient, safe and reliable construction technology. For more than 20 years, the sliding mode technology of inclined shaft has gone through four stages: winch traction sliding mode, CSM intermittent sliding mode, hydraulic climbing clamp traction sliding mode and LSD sliding mode system. However, due to its complex construction layout, small traction of hoist and limited rope capacity, it is not suitable for long inclined shaft construction and has not been widely used. 1990 or so, the concrete lining construction of diversion inclined shaft of pumped storage power station adopts the intermittent slip-form system developed by CSM company abroad, and it slides up 12.5m each time. Its disadvantage is that it can't slide up continuously and its efficiency is low. At the end of the 20th century, the concrete lining of the inclined shaft of Tianhuangping Pumped Storage Power Station was constructed by climbing formwork along the track with hydraulic formwork climbing pliers, and the formwork was continuously lifted. Sliding mode system won the second prize of national scientific and technological progress in 2000. Its main disadvantage is that the eccentric force produces a large eccentric moment, which makes the die body tend to turn backwards, bringing a series of adverse consequences such as die body deformation, bottom arch uplift and rail deformation caused by climbing pliers. The LSD inclined shaft slipform system developed in the construction of diversion inclined shaft adopts two continuous telescopic hydraulic jacks to pull out a bunch of steel strand traction formwork anchored in the surrounding rock of the top arch of the upper bending section, which is reasonable in force, safe and reliable, stable in operation, high in construction efficiency and good in concrete forming quality. LSD inclined shaft sliding mode system has been applied to the construction of two inclined shafts in Tongbai Power Station, and achieved very ideal results. Except that 1# inclined shaft stopped sliding due to typhoon and 2# inclined shaft stopped sliding as planned due to consolidation grouting at the lower part of inclined shaft, the sliding mode construction of each inclined shaft was completed at one time. 1# inclined shaft slipform construction time was in the summer of 2004, which reached a balanced high speed of 4.76 meters per day. LSD inclined shaft sliding mode system was approved as a national invention patent in 2006. The construction of inclined shaft successfully completed the slipform construction of inclined shaft with a length of about 300m under 1#, and the low temperature reached a high speed of 5. 1m per day. Heba Hydropower Station adopts 3.2m×3.2m square circular diversion horizontal tunnel side wall, and the self-developed horizontal tunnel slip-form system is used in the lining construction of the top arch, and concrete precast blocks are installed in the top arch to prevent concrete from collapsing due to insufficient strength. The project started construction in June 2006 +065438+ 10, and has achieved initial success. From the theoretical and practical experience, the difficulty of tunnel horizontal sliding mode lies in the control of concrete strength of top arch. In the construction of synovium, the technical requirements are very high. At the initial stage of concrete pouring into synovium, the plasticity of concrete is very poor, and in this case, the strength of concrete is also very low. In order to better ensure the strength of concrete after formwork removal and avoid collapse, the quality of concrete must be controlled when pouring. Concrete loses plasticity very quickly, which easily leads to formwork sliding and concrete cracking, which has a certain impact on quality.

Due to the late start of water conservancy project construction in China and the slow development of construction technology, the application of sliding membrane technology in water conservancy project construction has gone through a long time. Various conditions have led to the continuous improvement of slip-film construction technology, and great changes have taken place in its application field, which has become a common construction method in the concrete construction field of water conservancy projects. Water conservancy construction has a great impact on the country's social and economic development, and also plays a role in ensuring the country's energy supply. In addition, water conservancy projects play an outstanding role in flood control and drought relief, power generation and agricultural irrigation. To sum up, water conservancy projects have a great influence on people's quality of life. In the construction of water conservancy projects, the good construction method of slip film construction can better ensure the construction quality of the project.

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