A few days ago, the No. 6 and No. 8 tanks of the Tianjin LNG Receiving Station Phase II Project of the National Pipeline Network Natural Gas Branch, which was constructed by China Construction Power, will complete the dome concrete pouring at the end of July. The completion of the dome pouring also indicates that The civil construction of No. 6 and No. 8 storage tanks is basically completed.
Tianjin Liquefied Natural Gas (LNG) Phase II Project of the National Pipeline Network is a key project of “National Natural Gas Infrastructure Interconnection” promoted by the National Development and Reform Commission, an important livelihood project and an energy supply guarantee project for the construction of the national “production, supply, storage and sales” system. At the same time, as a key project in Tianjin, the overall plan of the project is to build 6 storage tanks of 220,000 cubic meters, 6 storage tanks and supporting facilities. After the completion of this project, it will become an important base for the winter supply of natural gas in the Beijing-Tianjin-Hebei-Shandong-Henan region, which will greatly enhance the natural gas supply and emergency peak-shaving capabilities in North China and surrounding areas, and will help optimize the regional energy structure, improve regional air quality, and prevent air pollution, etc. play an important role.
As a clean energy, natural gas produces less carbon dioxide when burned, which can improve environmental quality, help energy conservation and emission reduction, practice green development, and contribute to the national “double carbon” goal.
According to Zheng Chenglong, manager of China Construction Power Tianjin LNG Phase II Storage Tank Project, the No. 6 and No. 8 storage tanks constructed by China Construction Power are 62.4 meters high and 96.4 meters wide. a challenge. Due to the cumbersome installation process, poor installation accuracy and low installation efficiency of traditional construction methods, it has become a “stumbling block” in the face of tight construction schedule pressure.
In response to this problem, the project team spent 15 days on the traditional construction method to introduce the more mature direct burying technology of positioning plate anchor bolts at the bottom of large-scale equipment through investigation and research, repeated tests, and based on LNG storage tank isolation The characteristics and characteristics of rubber pads have innovated the installation technology of vibration isolation rubber pads. The project team designed and implemented the direct burying process of the lower components of the vibration isolation rubber pad. After the lower components were directly buried, the rubber pads were directly mechanically connected to the pre-buried lower components, reducing the need for custom positioning molds, installation molds and reserved pipes, etc. The reserved hole cleaning and other procedures can effectively ensure the installation accuracy and quality of the rubber pad, improve the construction efficiency, and at the same time realize the replacement function of the vibration isolation rubber pad in the later maintenance. The construction industry association assessment has reached the domestic leading level.
According to Zheng Chenglong, in order to ensure the construction quality, the project team also overcame a lot of construction problems during the construction process. For example, in order to prevent cracking of the concrete surface of the arc-shaped dome and reduce the cracks, the method of plastering the surface three times is used during the construction process, and it is sealed with plastic film. In the environment, the upper part is covered with a quilt and sprinkled with water for a long period of time. In addition to this, in order to control the curvature of the surface of the dome, the thickness of the steel protective layer and the curvature of the construction joint, the workers set up a set-shaped wood at the position of the construction joint to control the curvature of the construction joint. Controlling the longitudinal radian ensures the construction quality and appearance of the dome.
During the construction of the cap, the project team actively promoted the optimization and innovation of the use of the steel mesh bent frame support system, the large-diameter steel A-class mechanical connection technology, and the cap’s variable cross-section position steel interspersed construction and installation process, which effectively guaranteed construction safety and safety. Quality, reducing the difficulty of construction, saving about 15 days of construction period.
In the construction stage of the wall, we optimized and innovated the one-time hoisting technology of the reinforcement mesh of the wall, so that the prefabricated installation of the inner and outer reinforcement meshes can start from the first floor. On the premise of ensuring safety, we can reduce the construction links and save construction. cycle. Large-scale steel mesh fixed anti-overturning technology to improve the safety and reliability of steel mesh. On the premise of improving the construction accuracy and quality, the large annular belt built-in embedded plate fixing technology greatly improves the installation work efficiency and saves about 30 days of construction time.
It is reported that the second phase of Tianjin liquefied natural gas (LNG) project of the national pipeline network is planned to be completed and put into operation in 2023. After it is put into operation, it can guarantee the heating problem of 160.704 million people in winter. The LNG storage capacity of Tianjin LNG project will reach 1.54 million cubic meters, the daily export capacity will reach 70 million cubic meters, and the annual processing capacity will reach about 1,200 tons, nearly doubling the existing capacity and entering the tens of millions of tons. The ranks of LNG receiving stations provide a solid guarantee for the natural gas supply in North China.
