水利工程建设的目的是截留泄洪、调节水位、防旱排涝。从宏观角度来说,水利工程建设质量关乎区域经济发展与公众生命财产安全。然而,我国当前的小型水利工程建设质量监督管理工作仍存在诸多问题,且极大的制约了工程性能的发挥。在新形势背景下,为强化水利工程建设质量,应构建完善的工程建设质量监督体系,并采取行之有效的质量管理策略,确保水利工程发挥实际作用。
Abstract Traffic noise is the main environmental pollution of the elevated line. In order to prevent and control this noise, it is necessary to understand the spatial distribution of the noise. In this paper, the noise monitoring and data fitting of representative points near the Ningbo viaduct are carried out by means of the field test. By setting measuring points at different distances and heights perpendicular to and parallel to the elevated line, the spatial distribution law of noise near the elevated line is studied. The results show that: (1) The noise in the transverse direction of the bridge decreases in a logarithmic curve with the increase of the vertical distance between the measuring point and the viaduct; (2) The noise along the bridge decreases in a logarithmic curve with the increase of the vertical distance between the measuring point and the intersection; (3) The noise in the elevated direction first increases with the rise of the floor, reaching the maximum on floors 10-12, and the sound pressure on floors 12-20 is basically stable.
在水利工程中，生态护坡能够将河道以及周边植物覆盖率有效提升，实现水利工程河道水域生物全方面发展。河道生态护坡施工具有多种功能，主要是生态功能、防洪功能和景观功能，其主要技术形式包括原型护坡施工技术、土工材料固土施工技术、三维植被网护坡施工技术，这些技术形式有效应用能够将河道护坡防洪效果全面提升。基于此，文章就水利工程河道生态护坡施工要点展开分析和探讨。
幕墙开启扇锁点的理论分析包含锁点荷载和锁点承载力的取值分析,而锁点安全的实现需要同时保证锁点荷载和承载力的取值理论假设能够被实践.论文指出,通过对开启扇整体建模分析,充分考虑杆件的计算模型对锁点荷载的影响,可以求得最真实的锁点荷载;通过对锁点材质、厚度、截面的材料力学理论分析,以及与试验数据的对比,可以选取合适的锁点承载力取值;通过可操作、有效的方法检测锁点实际安装是否符合理论分析的假设,可以最终保证幕墙开启扇锁点的安全.
横琴口岸地处台风频发地区,内部两层下穿路属于市政道路,排水防涝要求高.论文根据实际工程特点,选用合适的暴雨重现期,通过芝加哥雨型生成器得到了设计暴雨曲线;根据分时雨水径流量,动态模拟雨水调蓄池进排水量,得到合理的设计参数,为下穿路雨水提升泵站的设计提供参考.
结合实际工程设计案例,对新型冠状病毒感染应急救治临时设施的给排水设计问题进行初步探讨.主要介绍了给排水设计的设计原则,从给水系统、空调冷凝水排水系统、通气管系统3方面分析给排水设计系统的设计难点.
Combined with the characteristics of airport engineering design,this paper introduces the calculation method of rainwater storage pool through a specific case.By determining the utilization method of rainwater,calculate rainwater parameters,such as the total amount of rainwater design runoff,infiltration area,inflow into the storage tank,infiltration into the storage tank,and storage capacity of the storage tank.And puts forward relevant suggestions based on case calculations.
In order to study the operation performance of the CO2 air source heat pump producing high-temperature hot water,the CO2 air source heat pump producing high-temperature hot water and conventional heat pump were compared and analyzed from four aspects:research status,operation mechanism,energy efficiency and economy,engineering application.In summary,the CO2 air source heat pump producing high-temperature hot water is a kind of high efficiency,energy saving,and environmental protection heat source.
In order to improve the effect of current construction project supervision,this paper studies and puts forward the application of wireless local area network and streaming media technology in construction project supervision,and puts forward an analysis model of construction project supervision.The empirical analysis of the analysis model of construction engineering supervision put forward by the research shows that the engineering safety score of the experimental group has increased from 6.9 to 9.0 after applying the analysis model.The project cost score rose from 6.7 to 8.6.The results show that the analysis model of construction engineering supervision proposed in this study can effectively improve the effect of construction engineering supervision.
The OLGA simulation software is selected to simulate the supercritical dense-phase CO2 pipeline transportation process,the impact of different operation and environmental parameters such as pipeline laying and insulation form,initial pressure,initial temperature,ambient temperature and pipeline diameter on pipeline transportation characteristics is analyzed,the optimal design conditions are determined according to the simulation results.The results show that the unit resistance loss of dense-phase CO2 medium is smaller than that of supercritical CO2 medium;On the premise of ensuring that the pipeline will not be gasified,the lower the initial pressure of the pipeline,the better;Higher initial temperature or ambient temperature makes it more difficult for the medium to transform into dense phase from supercritical phase;The pipe diameter under economic flow rate should be selected.
Based on a five-span prestressed concrete continuous rigid frame bridge in Gansu Province,this paper introduces the key technology of soft foundation pile construction,and analyzes the bearing characteristics of the test pile.The research results show that the test pile has a vertical settlement of about 5.3 mm at the design bearing load(6800 kN),the pile top settlement under the maximum load(13700 kN)reaches 27 mm,and the post-construction settlement is stable at 10 mm;The axial force of the test pile changes greatly at the top position,and is convex with the depth;The bearing capacity of the test pile meets the design bearing requirements.
This paper introduces the importance of construction project bidding management,analyzes the risks existing in bidding management,and puts forward scientific preventive measures based on relevant risks,such as strengthening the risk management of construction project bidding and establishing a scientific and perfect prevention mechanism,to effectively improve the economic benefits of engineering projects and ensure the stable development of the construction engineering industry.
In response to the quality defects such as displacement and floating that are prone to occur in the construction of GBF thin-walled square box hollow floor slabs,the characteristics of the construction method are analyzed based on engineering examples.On the basis of grasping the key and difficult points of construction,the quality control of the construction process such as formwork support,square box fixation,and concrete pouring is strengthened,and the key points for controlling the quality defects of engineering construction are summarized.By strengthening the control of the plane position of the box and adopting methods such as anti floating and vibration compaction,various quality defects can be prevented,and the engineering quality can pass the acceptance at once,achieving ideal economic and social benefits.
In combination with the infrastructure construction such as railway and highway tunnel extends to cold areas with harsh natural environment,so the tunnel is facing severe frost damage during operation.The domestic tunnel cold insulation lacks clear active insulation measures.For this reason,this paper takes Xinxiang Tunnel as the background,explores the construction scheme of cold proof and thermal insulation for tunnels in cold regions,and finally proposes the method of laying two layers of waterproof boards,setting 5 cm polyurethane insulation layer in the middle of waterproof boards,and taking the method of deep buried central ditch drainage to carry out waterproof and thermal insulation work,so as to solve the problem of tunnel frost damage.
Under the influence of freeze-thaw damage and salt ion corrosion,the mechanical properties of concrete structures are reduced.For the purpose of maintaining structural stability,this paper discusses the concrete performance and change characteristics during sulfate corrosion freeze-thaw cycle by using theoretical analysis and indoor cyclic accelerated test methods.The key analysis factors include water binder ratio,air entraining dosage and fly ash dosage.The results show that the first two factors have a significant impact on the performance of concrete,improving the overall performance of concrete.Air entraining agent,fly ash and other materials have a good role in promoting the performance of concrete.
Aiming at the problems of construction safety management and construction quality management of large-scale construction projects,it is proposed to use BIM technology to establish a three-dimensional information model of construction engineering for construction safety and quality management,including using BIM technology to reduce construction safety accidents,conducting construction safety coordination management,and using BIM technology to promote and educate front-line construction workers on safe construction.Improve the construction quality control process,and establish a large-scale construction project quality information management platform.
