The research proposes a theoretical model for EPC engineering general contracting project man-agement led by design institutes based on partnership,and tests the theoretical model through questionnaire data and structural equation modeling.The research conclusion reveals the mechanism of the partnership,integrated manage-ment,project management,and project performance between the design institute,construction units,and procure-ment units.Verified that partnership helps to strengthen project integration management,which helps to strengthen design management,procurement management,and construction management.Contribute to efficient project man-agement and continuous improvement of project performance.And propose the important role of building partner-ships and improving integrated management capabilities in project performance.
The design logic of underground commerce and aboveground commerce is basically consistent,with a focus on solving the tripartite matching of"content space dynamic line".Among them,the moving line is the skeleton,the content is flesh and blood,and space is the carrier.This study analyzes the four core components of un-derground commercial power lines:horizontal power lines,vertical power lines,sunken squares,and atriums.Com-bining multiple practical cases,it summarizes the data and methods of underground commercial power line design,in order to provide reference for similar projects.
Due to the complex structure of outdoor sports stadiums and the poor appearance quality of the stands,it is difficult to control the processing quality and installation accuracy of prefabricated stands.This study elaborates on how to ensure the quality and installation accuracy of plain concrete from the aspects of factory processing accuracy,on-site installation quality,and electrical integration design,and introduces the optimization of prefabricated plain concrete stands in the deepening stage.In order to solve the problems of poor construction quality and slow construction progress of conventional cast-in-place concrete,in addition to solving the technical difficulties of poor installation accuracy and electromechanical integration of traditional prefabricated concrete stands.
To study the stress and stability of container house under external load,a finite element model was established based on ABAQUS,and the effect of corrugated plate size parameters(wavelength and inclination angle)on the column stress and structural stability coefficient was studied in detail.The results show that when the column side length of container house is small,the column bearing capacity decreases rapidly with displacement.When the column side length is large,the column bearing capacity decreases slowly,and the overall trend is basically the same.When the column side length of container house is small and the inclination angle of corrugated plate is 45°～55°,the column bearing capacity decreases rapidly with displacement.When the side length of the column is large,the overall trend of the column axial force-displacement curve is basically the same.When the inclination angle of the corrugated plate is 50°,the column bearing capacity decreases rapidly with the displacement.The research results can provide valuable reference for the mechanical stability of container house in service.
According to the definition of seismic angle in earthquake resistant design code,the study calculates the seismic angle of retaining wall taking all factors into consideration,to perfect the theory of anti-seismic design,providing reference for seismic angle calculation of different structures,and points out that the seismic angles should be different according to different structures.
Taking 2～4 stations on Nanjing metro line 9 as a pilot project,the traditional construction method of secondary structure has been broken.A high-performance concrete technology with lightweight wall panels and composite columns has been adopted,which has the characteristics of ultra-high,ultra-light,fire-resistant,waterproof,bending resistant,and high toughness.The on-site construction process adopts a new type of mortise and tenon connection technology,with no wet operation throughout the entire process,saving 3～5 months of construction period.The mechatronics integration construction technology,through forward design integration,solves the long-term problem of large-scale equipment maintenance and replacement in the subway industry,improves the quality of equipment systems,and is a breakthrough in promoting industrial upgrading and upgrading.
The effect of setting interim partition piles in the foundation pit of a subway station of Chengdu metro by semi-cover and cut method is analyzed using tri-dimensional finite difference method,both the pile deformation and characteristics of soil pressure applied to partition piles due to the excavation of soil in the foundation pit after the interim partition piles are set in the foundation pit are obtained.In addition,the comparison between the calculation results of foundation pit with partition piles and the ones of foundation pit without partition piles is also conducted.The research shows that the setting of temporary partition piles in the foundation pit of subway station by semi-cover and cut method is conducive to reduce both the deformation of soil between partition piles and the deformation of cast-in-place subway station roof due to the excavation in foundation pit.The partition piles can then be used to support the foundation pit of subway station by semi-cover and cut method.
With a steel structure of the old factory structure renovation project as the research object,expounds the existing building safety,seismic appraisal,new external load involved in the overall model combination calculation,single order column calculation length coefficient value,bearing capacity or structure does not meet the component using increased section method for reinforcement and steel structure corrosion,fire prevention requirements.
Based on the slope in the Dongqing section of Guizhou-Dalian expressway K44+370～K44+820,the principle of slope instability under the action of surface water infiltration and groundwater seepage is analyzed.The slope site is covered with residual eluvial silty clay,and the underlying bedrock is sandy mudstone.After encountering water,the shear strength parameters are greatly weakened,and the sliding resistance is reduced,which leads to the safety risk of slope instability and decline.The following measures are taken on site:the cracks at the rear edge of the slope are tamped with clay and set up.
In this study,the construction process of C-ramp bridge in the interchange of Longmen Junction of Zhengzhou to Luoyang expressway is deeply studied.According to the characteristics of the project,the jacking construction method is selected for the construction of steel box girder.The construction can be carried out smoothly by designing reasonable pier structure,selecting correct pushing equipment and setting up comprehensive safety measures.In the design,the influence of the transverse slope of the steel beam,the radius of the route,the intersection Angle between the pier and the direction of the route is especially considered to meet the needs of construction.
The construction of deep foundation pit in soft soil layer is very difficult.The traditional engineering construction generally adopts the supporting pile method and other ways to carry out construction,but this construction method has high cost and long period.Based on the design of deep foundation pit support in deep soft soil of Eaton Manor,the study adopts"retaining wall"support,"slope release,lattice anchor and soil greening"support,"slope release,anchor and soil greening"support and other support forms.
According to the technical requirements of the skip bin method,we selected concrete materials,optimised the mix ratio,adjusted the construction deployment,optimised construction techniques,construction joint handling techniques,crack control techniques and temperature measurement and control techniques,and completed the construction of the underground garage concrete structure with extra-large volume,which accelerated the progress of the project,guaranteed the quality of the project,reduced the cost,reduced pollution and reduced the management of project safety,quality,progress and environmental protection.The construction of the underground garage has been carried out in the following way.
This study takes a certain large bungalow project as an example to analyze the specific application of aluminum-wood combined construction technology in non-standard floor construction.The final practice proves that the application of aluminum-wood combined construction technology in non-standard floor construction of a large bungalow project is not only conducive to shortening the construction period of the project,and the overall cost is also lower than the single wood formwork process or aluminum formwork process.
The extensive promotion of green energy-saving construction in China has gradually popularized prefabricated buildings to meet the development needs of creating green construction sites and reducing construction waste,making a significant contribution to the development of the construction industry.Based on the actual case of the project,this study analyzes the applicable conditions of aluminum alloy formwork in prefabricated construction and the deepening construction deployment in the early stage,summarizes the advantages of aluminum alloy formwork in prefabricated construction,and provides reference for similar projects.
There is a cantilever steel structure truss in the super high-rise of Building 1 of the Biopharmaceu-tical Industry Accelerator Park Project in Pingshan District,Shenzhen.The construction process,main construction techniques,temporary support and unloading techniques of the large cantilever steel structure were studied,in order to provide reference for similar projects.
In order to study the deformation stability of subgrade widening,based on the reconstruction and expansion project of south ring road in Shuozhou city,Shanxi province,the differential settlement characteristics of new and old subgrade widening projects in loess area are studied by means of finite difference numerical simulation and theoretical analysis.The results show that the settlement and horizontal displacement of the old and new subgrade maintain a positive correlation with the filling height of the widened subgrade.With the increase of the filling height,the horizontal displacement at the slope toe of the old and new subgrade also increases gradually,but the maximum horizontal displacement appears at a certain 2 m below the surface.
At present,our country's social economy is constantly accelerating development,the material living conditions of the people are also constantly improving,to a certain extent,the building design has also put forward higher requirements.In the process of architectural design,most design units have also begun to actively use green building design,hoping to reduce the pollution caused by buildings to the environment.
The DMG base pore pressure drainage and regulation system can effectively regulate and control the elevation of the building's anti floating water level,and together with the side wall interception and drainage system and emergency pressure reduction system,form an anti floating and pressure reduction system to achieve rapid drainage in extreme weather,effectively prevent fatigue and tensile failure of anti floating components,and extend the building's lifespan.At the same time,the system has simple construction and fast construction speed,and can be used for various bottom plate construction without the need for large-scale mechanical assistance.This project uses the DMG base pore pressure dredging and adjustment system to solve problems such as narrow site,deep foundation pit depth,inability of anchor bolt machines to enter and exit,cumbersome anchor bolt process,and long construction time.It is suitable for situations where it is inconvenient to use,increase the structural weight,and pile anchor resistance to floating.
Taking the terminal of Urumqi airport reconstruction and expansion project as the research object,the construction technology of glass curtain wall supported by hyperboloid frame was analyzed,and 14 indicators were monitored on site after installation.The results show that the construction difficulty of the double curved frame supporting glass curtain wall is mainly the irregular parabolic lines of the curtain wall,the keel spacing is different,the direction is different,and the supporting profiles are more difficult to locate,process and install.The hyperbolic curvature of the glass curtain wall makes the building facade convex and convex,requiring the keel and glass to be customized with special shapes.The keel needs to be bidirectional bending and torsion,and the processing error leads to the geometric increase of the installation error.Field inspection of 14 indicators are in line with the requirements,the double curved frame support installation precision control is good.
In order to reduce the amount of cement in concrete,this study studied the effect of partial replacement of cement with waste clay brick powder on the performance of concrete.In this study,the compressive strength,flexural strength,elastic modulus and chloride penetration resistance of waste clay brick powder concrete are tested by using three different substitution levels of 15％,25％and 35％.
