New construction technique of the house building
House building has been our company's advantageous field for occupying the market, which makes full efforts to create the 1st brand of transportation construction and housing construction of CCCC. With uninterrupted development of building technology, our company has developed and applied a large batch of advanced new technologies and new processes in the field of high-rise buildings in recent years. Qingdao Etsong International Hotel project completed in 2001 won the title of best contractor issued by the owner, The business building of Fourth Engineering Company Ltd. at Tianjin Port won the gold award of Tianjin 2007 Haihe River Cup, Yihang Building Project won silver award of 2009 national high-quality project, and Phase I and Phase II of Xiangyi Garden won the "Haihe River Cup" award of 2016 Tianjin Construction Project, Zhuhai Huitong Hengqin Square Project undertaken by our company at present is the highest building of transportation construction in China, and the maximum height is 319.5m.
 Qingdao Etsong International Hotel Project
 New Business Building Project of Tianjin Port No. 2 and No. 4 Project 
 Yihang Building Project
 Zhuhai Huitong Hengqin Square Project
The following is detailed introduction of our company's scientific and technological achievements in the field of high-rise buildings.
1 、Application of BIM technology in Huitong Hengqin Square Project of CCCC
Application of BIM technology in the project is mainly reflected in integrated layout of the pipeline, rapid calculation, progress simulation, virtual construction, automatic bricklaying, steel structure deepening, process demonstration (visual disclosure), safe and civilized construction CI system design and other aspects; According to construction management features and actual development demands, Glodon BIM5D rapidly developed in China supporting international general Autodesk BIM technology is adopted in the project, which completes general layout, visual disclosure, rapid statistics of engineering materials, deepening of complex nodes, collision check, reinforcement lofting software substituting manual lofting and management and other work during construction, so as to improve working efficiency, save management cost and provide assistance in delicacy management.
2、Key construction technique of super-high-rise building core tube
With Huitong Hengqin Square Project of CCCC as the carrier, research key construction technique of the core tube, and take climbing formwork construction technique of the core tube, super-high measuring technique, super-high pumping technique and sway arm tower crane climbing technique as the main research objects. As per engineering structure system, the internal climbing formwork system is adopted for the elevator shaft of the core tube. The internal climbing system has internal climbing power, having the function of automatic climbing. The working platform and the template system are attached on the climbing formwork system, and can be promoted with the climbing of the climbing formwork system, which can adapt to requirements for pouring construction of the continuously rising structure.
According to the project progress, the settlement observation and deformation control analysis of the core tube are conducted regularly, and the fitting line or closing line is adopted, realizing fixed machine, fixed people and fixed line; the observation and comprehensive analysis of compression deformation observation shall be conducted through GPS elevation, high precision total station zenith method and other techniques. The floor slab construction elevation span of the project building is large, and the concrete pumping height is super high. According to changes of concrete construction elevation, and considering the construction slump degree, temperature, weather and other factors, plenty of concrete shall be subject to trial mix, so as to guarantee that the construction concrete is free of bleeding and segregation, and plastic shrinkage crack of floor structure can be effectively avoided while the above-mentioned concrete construction procedure measures are taken.
3、Construction technique of steel structure of super-high-rise building
With Huitong Hengqin Square Project of CCCC as the carrier, research the construction technique of steel structure of super-high-rise building , mainly take construction of the steel pipe column, extension arm truss and steel plate shear wall as the main research object, mainly research processing technique of complicated major-diameter giant steel pipe column, control technique to prevent welding deformation, cold crack and residual stress through long-term welding of large-pipe-diameter thick-wall steel tube, key technique to monitor and prevent welding deformation through field welding of single-layer steel plate shear wall and high-altitude welding of complicated nodes of extension arm truss part, hoisting technique of heavy nodes of extension arm truss layer, technique of installation of steel structure of lower foundation pit of large hoisting machinery and so on, so as to obtain control construction method and operation process, and guarantee that the structure quality of steel structure satisfies design requirements.
4、Development and application of integral lifting scaffold of high-rise building
The main building of Qingdao Etsong International Hotel Project has 39 layers, and it is particularly important to select economic and rational external scaffold scheme. According to the structural features of the engineering construction, we develop and apply segmented integral lifting scaffold through comprehensive analysis and careful research.
The integral lifting scaffold mainly consists of the following components: scaffold bottom truss, loading-bearing base of the scaffold, slow elevator, lifting steel cantilever beam, diagonal draw bar, through-wall load bearing bolt, anti-external leaning and anti-falling device and so on.
The integral lifting scaffold adopted in the project has high safety performance and low cost price, and has obvious advantages compared with the traditional external cantilevered scaffold.
5、Development and application separated hydraulic lifting climbing frames of high-rise building
The separated hydraulic lifting climbing frame is successfully applied in the project of office building of CCCC First Harbor Engineering Company Ltd.The separated hydraulic lifting climbing frame is attached on the engineering structure through attached support, lifting and lowering are realized relying on the lifting force of the hydraulic lifting device, and the scaffold is lifted and lowered along the building with the project progress. The hydraulic lifting system converts electric energy into hydraulic energy through the motor driving hydraulic pump, and drives hydraulic cylinder piston rod to convert it as mechanical energy to drive load through control valve, so as to complete the action of jacking and lowering.
The separated hydraulic lifting climbing frame mainly consists of 4 basic parts of frame body, attached support, lifting system and safety device. Compared with integral lifting scaffold adopted in the main building of Qingdao Etsong International Hotel, it has advantages of higher safety performance, stronger applicability, and can be applicable for complex architectural appearance.
6、Large-span space shell mold technique
The large-span space shell mold technique is generally applied for large-span building engineering, such as shopping malls, warehouses and so on. The features include: lowering floor height, increasing the building span, reducing self-weight of the building, saving materials and lowering the project construction cost; the template construction process is simple, and the template installation exercise is changed as direct laying, so as to mitigate labor intensity and improve construction speed; the dense ribs of fair-faced concrete are regular, artistic and orderly arranged in square, which has the value of art appreciation; the template can be removed directly without removing the keel, so that the turnover efficiency of the shell mold can be improved.
The large-span space shell mold technique has been successfully applied in Qingdao Etsong International Hotel and skirt building structure engineering of business building of No. 2 and No. 4 Company of Tianjin Port Group.
7、Structural reinforcement technique of high-rise building
After capping of the main structure of Qingdao Etsong International Hotel Project, Party A requires large-scale structure changes in the original design, the original building designed according to the training center is modified to satisfy demands of four-star hotels, and the main structure is subject to large-scale changes, mainly including: chiseling 5 openings with size of 1380*2990 at prestressed platform board of each layer, adding 3 elevators from the basement to the 39th layer at the main building, cutting two reinforced concretes with sizes of 2500*4700 and 2500*1975 separately for reinforcement, and large-range cutting for the beam slab originally designed on the lobby of the skirt building and so on.
Such large-scale reconstruction and reinforcement of the project is rare in the whole country. We collaborate with the design unit to develop and apply multiple new technique for structure reinforcement, mainly including:
（1）Opening and reinforcement techniques of the prestressed floor slab
（2） Opening hole and structure reinforcement techniques of new elevator shaft floor slab of the main building
（3） Reinforcement process of frame structure of skirt building
（4） Reinforcement process of HILTI drill and embedded bar
8、Large-span unbonded prestress construction process
The large-span unbonded prestress construction process is adopted for two 1/4 circular arcs of the main building of Qingdao Etsong International Hotel Project. Floor slab thickness 230mm and span 9.6m. 7φs5 steel wire bundle is adopted, and the steel wire is Level 1670. The upset head anchor is adopted for the fixed end, and XM15-1 clip anchorage device is used for tensioning end.
The available space of the whole floor can be effectively increased through the process, which is favorable for the layout in the building.
9、Application of light steel keel ETERPAN partition wall in Yihang Building Project
Light steel keel ETERPAN is a kind of fiber enhanced silicate plate (fiber cement plate), the main raw materials are cement, concentrated minerals and environmental-friendly fiber imported from New Zealand. It is autoclaved at high temperature through flow-on process. It has features of convenient construction, simple installation, green, lightweight, high strength, damp proof, fireproof, thermal insulation, soundproof, sound absorbing, good seismic resistance performance and so on.
As a kind of novel material for partition wall of the building, compared with sand aerated concrete block wall, the expense per square meter can be saved by about 90 yuan, and it has very good promotion value.