The construction industry is currently undergoing digital transformational changes. The traditional construction engineering management model is faced with such pain points as extensive management and control, low efficiency and insufficient collaboration, which is difficult to adapt to the demands of high-quality development. The intelligent construction technology is promoted to become the core driving force of engineering management innovation by issuing the Guidelines of Intelligent Construction Technology (Trial). In this paper, the core connotation of intelligent construction technology and transformation needs of construction engineering management are sorted out, internal logics of their integration are explored, innovative application paths of intelligent construction technology in engineering cost, schedule, quality and safety control are focused on, implementation guarantee system of technology applications is constructed as well as the demonstration is supplemented combining with relevant technical principles and industrial construction application scenarios by adopting the methods of literature research and theoretical analysis. The research showed that the digitization, refinement and intelligent upgrade of engineering management could be realized, bottlenecks of traditional management could be broken as well as efficiency and quality of engineering management could be improved with the intelligent construction technology.

The research object of this paper is the light carriage of electric wheel mining dump vehicle with load of 330 t. The three-dimension design of light carriage is carried out with Pro-E software, the simplified three-dimensional model is introduced into ANSYS for finite element analysis. The structural safety of carriage under the two typical working conditions of being fully loaded and stationary as well as driving on uneven road is analyzed based on the actual operations of electric wheel mining vehicle. The analysis results showed that the overall stress distribution of light carriage was more uniform, safety factor was larger, while deformation was relatively smaller as well as its strength and stiffness could meet the use requirements.

The disease characteristics are accurately studied and judged through refined detection on site aiming at such composite diseases as sedimentation, leakage and structural aging that have become prominent during the operations of closed conduit for diversion closed conduit of Baotou Steel for over 65 years. The systematic comprehensive treatment scheme is established by adopting the collaborative dredging technology of “horizontal directional drilling machine+ dredging vehicle with high-pressure water jet” and graded leaking stoppage technology of composite grouting as well as combining with the full-process closed-loop construction monitoring system. The water transfer function of closed conduit is fully recovered, conveyance capacity is increased from 30% before treatment to 5 m³/s, the designed flow rate of water transfer and service life of structure is extended by over 15 years after implementing this scheme, which provides the reproducible and propagable technological paradigm for treating aged water conservancy facilities in the Yellow River basin.

The high carbon medium manganese steel is with the La+Ce complex processing. The occurrence state and change rules of storage for La and Ce in high carbon medium manganese steel as well as the effects of La and Ce on sulfides, oxide inclusions, microstructure, static compression hardening efficiency and impact wear property are systematically studied through the composition analysis, microstructure observation, 30% static compression, impact wear test and theoretical analysis. The study results showed that the contents of solid solution La and Ce in steel could not be increased by adding into a large amount of La and Ce as well as they all remained below 0.003 5% for high carbon medium manganese steel. The 30% static compression hardening efficiency at room temperature can be improved with La and Ce, from 94.4% without La and Ce to 96.68%~108.2% with La and Ce; impact wear resistance of sample is improved with La and Ce as well as relative wear resistance is increased by 1.057 0~1.606 9 times when impact load is 2 J and 1.080 4~1.374 1 times when impact load is 5 J. Under the experimental conditions, the optimal amount of La+Ce added into high carbon medium manganese steel is 0.20%~0.25%.

This paper is aimed to discuss the strategies for coal machine enterprises to manufacture middle trough of scraper conveyor with intelligent welding equipment. The applications of intelligent welding technologies in production of middle trough for scraper conveyor are comprehensively studied, which include the design of welded structure and process optimization as well as real-time monitoring integrated with multiple sensors. The comprehensive applications of multiple technologies could significantly improve the welding operation efficiency and welding quality of middle trough. It is expected that the content of this research could provide intelligent solutions as references for manufacturing enterprises of coal machine and mining production units.

The influencing mechanisms of banded structure, nonmetallic inclusions and grain size on transverse impact toughness are systematically analyzed aiming at such problems as great fluctuation of transverse impact property and unstable low-temperature toughness of H beam SM490YB for ocean engineering. The Mn segregation and spheroidized inclusions are effectively inhibited, grains are refined as well as microstructure homogenization is realized through adopting such comprehensive measures as composition optimization, modified inclusions with Ca treatment, low superheat continuous casting as well as controlled rolling and cooling. The transverse impact energy at -20 ℃ is improved, fluctuation is reduced, banded structure is improved, spheroidization effect of inclusions are obvious and grains are refined for H beam with specification of H300×300 with treatment of optimum technology.

The robot has wide application scenarios in industrial field. In this article, the advantages and disadvantages and applicable scenes for inspection robots with different structures are discussed; structure and such key technologies as motion control of self-propelled orbit type inspection robot are mainly studied; frame structure, such modules of constituting inspection robot as main control system, control device of motion and walking, signal pickup assembly of vision and sensor, power management (charging device), wireless communication system and auxiliary functions and hardware design of corresponding modules are introduced; motion control method with proportion integration differentiation (PID) control technology of inspection robots and motion control optimization method of inspection robot with the technology of artificial neural network are studied; detection method of motion track for inspection robot based on radio frequency identification (RFID) technology is discussed; applications of inspection robot in industrial field are briefly introduced finally. The movement velocity and stability of inspection robot are improved so that its movement process is effectively optimized with the technologies and methods described in the paper, which could provide the technical support for applications of inspection robot in industrial field.

As a kind of revolutionary metal protection material, the Zn-Al-Mg coated steel has become the upgraded substitute of traditional zinc-plating material due to its excellent corrosion resistance, self-repairing capability and good processing performance. In this paper, it is systematically overviewed the research status, market analysis, technological progress and development trends of Zn-Al-Mg coated steel at home and abroad. Firstly, it is emphatically analyzed the progress of such key technologies as the composition design, performance optimization, mechanism of corrosion resistance, life model, technological breakthrough of welding and processing as well as environment friendly surface treatment technologies. Secondly, the application status of Zn-Al-Mg coated steel in such fields as photovoltaic industry, automobile and construction is discussed as well as future development trends towards high strength, light weight, environmental protection and intelligentization are proposed aiming at such challenges facing by the industry as non-uniform technical standards and cost pressure. Finally, the suggestions on healthy development of Zn-Al-Mg coated steel industry in our country are put forward.

In order to solve the problem that the dispersed degree of detection results for residual carbon in incoming inspections of diesel oil is high, the effects of constant weight operation on inspection data stabilization are explored by selecting such four key indexes as residual carbon, ash content, total pollutants and mechanical impurities with the control variate method in this study. The results showed that there were no obvious differences for the stabilization of two groups of data due to the mandatory constant weight in standard of detection of ash content; the relative standard deviations of detection results for residual carbon, total pollutants and mechanical impurities were increased to 5.3%, 8.7% and 7.9% respectively as well as dispersed degree of data was significantly increased without constant weight operation. In the detection of residual carbon for diesel oil, the uncertainty of weighing could be effectively reduced and system errors could be controlled by supplementing constant weight operation of empty sample tube so that the accuracy and repeatability of detection data in such situations as low residual carbon (≤0.1%) samples and proficiency testing could be improved. This study provides the references for quality control of detecting diesel oil in laboratory.

As the key node of urban gas transmission and distribution system, safe and stable operations of gas station are highly dependent on continuous and high-quality electric energy supply. In this paper, the systematic research is carried out combining with the reliability theory and energy storage technologies of electrical power system aiming at the vulnerability of power supply system for key equipment in gas station (take the city gas gate station and LNG peak-shaving station as examples). Firstly, identify such key sensitive loads as compressor, electric drive pressure regulating device, safety instrumented system (SIS) and process control system (PCS) based on the architecture of power supply and distribution system as well as load characteristics in typical gas station; secondly, the influence probability and severity of consequences of such accidents as external power grid failures, internal electrical failures and voltage sag on key loads are with quantitative analysis by establishing vulnerability evaluation model of power supply system combining with the probabilistic risk assessment (PRA) and sequential Monte Carlo simulation; finally, the enhancement strategies taking energy storage system (including but not limited to UPS, flywheel energy storage, super capacitor and hybrid energy storage) as the core are proposed, optimum collocation model of energy storage capacity with the targets of power supply reliability, power quality improvement and full life cycle economy is established as well as emulation proof is carried out with the platforms of ETAP and MATLAB/Simulink.