Vibration replacement gravel pile is one of the key technical methods to solve the problem of deep overburden layer in hydropower development in southwest China. As a concealed project,the construction quality management of vibration replacement gravel pile is affected by many adverse conditions. In order to overcome the problems in traditional vibration replacement gravel pile quality management system,such as human factors,low timeliness of quality management,based on the foundation treatment of Yingliangbao Hydropower Project,this paper the quality management process of vibration replacement gravel pile was combed,and a set of construction quality management system of vibrating replacement gravel pile was developed,which can effectively improve the construction quality management level of vibrating replacement gravel pile.
Based on the example of the middle pier foundation protection of Jinlong Bridge on Dadu River in Jinkouhe District,Leshan City,this paper analyzes and summarizes the construction characteristics,construc-tion technology and quality inspection methods of high-pressure jet grouting piles and steel pipe piles.Practice has proved that the combined application of high-pressure jet grouting piles and steel pipe piles can combine strong points of each other to make up for their mutual deficiencies to achieve the expected effect,which can provide reference for the construction of similar projects in the future.
The rigid body limit equilibrium method is used to review and calculate the anti-sliding stability of arch dam abutment of a hydropower station,and a sensitivity analysis is carried out for the mechanical parameters of structural plane and the reduction coefficient of uplift pressure.The calculation results show that the anti-sliding stability and safety of arch dam abutment meet the specification requirements,and there is a large safety margin,which can provide reference for the safe operation and management of the hydropower station dam.
2023年10月28日9时13分,由水电十局机电安装分局承建的西藏那曲色尼区欧码亭嘎100兆瓦风电项目24号风机轮毂与发电机机舱顺利完成对接,标志着西藏那曲100兆瓦风电项目25台风机全部顺利完成吊装,为年内全容量并网发电目标奠定了坚实的基础.
The tailrace tunnel of Karuma Hydropower Station in Uganda is divided into three branch tunnel con-struction sections:N0.8 and No.9,and the tailrace.During the construction process,the electrical equipment used in the tunnel includes concrete pump trucks,multi-arm drilling machines,water pump drainage systems,ventilators,lighting and various types of small power tools used in construction.Due to the far distance be-tween the working face and the tunnel opening and the high power of electrical equipment,it is necessary to in-troduce 10 kV high voltage into the tunnel and reduce the voltage to 400 V to meet the use of electrical equip-ment.Therefore,how to choose suitable 10 kV distribution equipment,electrical materials,ensure qualified power supply and safe operation of safe operation of the distribution system.This article takes the construction area of the No.8 adit as an example to organize the selection principles and calculation methods,which can provide reference for similar projects.
;In order to improve the rescue ability to cope with the harsh environment on the sea,some agencies have moved the climate environment that may be encountered on the sea into the indoor controlled environ-ments for simulation training of professional rescue teams or athletes.The average depth of the ordinary swimming pools is about 2 meters,while the pool with special training requirements is usually designed to be more than 5 meters.Due to the factors such as the weight of swimming pool brick surface,temperature chan-ges and humidity fluctuation of water circulation system,as well as the need to create waves,ocean currents and place rolling racks during training,the pressure requirement of swimming pool brick surface is very high,so that quality problems such as falling off of the pool brick surface and water seepage can easily occur.There-fore,in the swimming pool waterproof decoration project,the waterproof,leak-proof and anti-falling system are the key points of the quality control of the pool project.Combined with the innovative construction technol-ogy"polymer waterproof ant-cracking mortar+dense fiber mesh"for the pool wall waterproof,this paper ex-plains the research and quality control of the swimming pool decoration construction technology.
2023年7月18日,在喀麦隆中部地区纳齐提加大坝蓄水仪式上,喀水资源与能源部长宣布,总装机420兆瓦的纳齐提加水电站(喀最大水电站)将于2024年9月全部投产,其中首台60兆瓦发电机组将于2023年12月投产,每年可向南部互联电网输送约2 970 GWh电力.水电站每度电发电成本为42中非法郎(约0.07美元),远低于火力发电的200中非法郎成本,可为喀节约大量资金.此外,预计2026年喀南北电网互联建设完成,纳齐提加水电站还将提高北部电气化水平,缓解喀北部地区供电紧张局面.
Taking the tunnel collapse treatment plan of Sansigou Hydropower Station as an example,the article explains how to use the collapsed slag body as a support and use pumped concrete to fill the collapsed cavity of the tunnel with a certain thickness to reduce the collapsed cavity,restrain the surrounding rock around the col-lapsed cavity,and form a closure in the upper part of the tunnel which ultimately plays the role of provide ad-vanced support,thereby,providing a safe operating space for ensuring the treatment of the collapsed body in the tunnel and subsequent tunnel support work.And it may provide reference for the selection of similar tunnel collapse treatment plans.
Taking the upper reservoir of Yuan an Pumped Storage Power Station as an example,this paper com-pares and selects the dam type and anti-seepage form for whole reservoir basin.Considering coordination from the three aspects of the dam,reservoir bank and reservoir bottom,the author focuses on a comparative study of the three combination schemes.Through the comprehensive comparison of topographic and geological condi-tions,construction conditions,engineering technical difficulties and program economics,the combined scheme of"concrete-faced rockfill dam+reinforced concrete panel around reservoir+geomembrane at the bottom"of the reservoir bottom is proposed.The research ideas and results can provide reference for other seepage pre-vention of whole reservoir basin and dam type design.
The Beleval mining area is located in the northeast of Khujand City,about 400 km away from Dushan-be.The ore bodies and rock mass fractures and fracture zones in the mining area are developed(class Ⅳ/Ⅴrock mass,RQD value 0％～50％).This paper uses Micromine 3D mapping software,replaces the ore body grade values with the drilling RQD values based on the principles of 3D modeling and ore body spatial distribu-tion grade evaluation,and conducts RQD 3D geological modeling of the Belevar mining area,simulates the spa-tial distribution form of the ore bodies and rock mass fracture zones in the mining area and provides a complete and intuitive model for the production and construction of the mining area,which is intuitive and easy to use:The spatial morphological relationship between the fracture zones and the ore bodies is clearly displayed,and according to the 3D model,it can be determined that the+950～+900 m elevation is suitable as the first mining area.
The reinforcement with vibroflotation piles is often used for the treatment of complex foundations in river valleys.However,the difference in the permeability of the foundation interlayer leads to problems in the implementation of the inverted layer of the vibroflotation piles.Based on the construction scheme of vibroflota-tion piles adopted in the design of deep overburden foundation of Yingliangbao Hydropower Station,this paper proposes a construction technology of high-efficiency inverted layer in view of the difficulties of fragile filter materials and difficult in guaranteeing forming quality.The specific steps are:woven PP geotextile to make a"sausage-type"inverted bag with good durability and corrosion resistance;adopt a segmented"sausage-type"chain-type inverted bag filling method,which can maintain its own ductility during the vibration squeezing process and still accurately lay in the vibroflotation piles to ensure the forming quality of the inverted layer.It provides a new method for the construction of the vibroflotation piles inverted filter for complex foundation treatment.The construction technology of high-efficiency inverted layer has obtained invention patent,with the authorized patent number ZL 202111649012.3.
During the construction of pumped storage power stations,scaffolding is used as the form work sup-porting structure system in many parts of the structural concrete construction.Especially for the concrete and concrete lining construction of underground powerhouse rock wall crane beams,tailgate tunnel rock abutment beams,upper and lower reservoir inlet and outlet,and hoist room structures,due to the total construction load and concentrated total load exceed certain limit,frame height and span being excessive,the formwork bearing structure system has become a more dangerous sub-project exceeding a certain scale.How to select a form-work system with safe and reliable structure,convenient for on-site construction and reasonable cost in the con-crete construction of pumped storage power stations with complex structure and overload is very important.The formwork system must adhere to the principle of safety first from structural design,expert evaluation to on-site implementation.Taking Zhejiang Ninghai Pumped Storage Power Station as a successful case of com-prehensively applying high-strength bowl-buckle scaffolding as the concrete formwork support system for an ultra-hazardous large-scale project,this paper expounds the characteristics and advantages of high-strength bowl-buckle scaffolding,and provides reference for the construction of pumped storage power stations.
After decades of mining in the Alden-Topkan Lead-zinc Mine area in Tajikistan,numerous large and small goafs have been formed within the scope of the mining rights,which has posed a great threat to safe pro-duction.Therefore,it is very important to ascertain the shape and location of the goafs and then choose scien-tific and reasonable treatment measures to reduce safety hazards and prevent goaf collapse.Based on the char-acteristics of the underground goafs in the Alden-Topkan Lead-zinc Mine area in Tajikistan,this article intro-duces a example of using the domestic geophysical exploration to detect the underground space,and analyzing geological radar to detect the goafs in the underground mine to provide reference for mine safety production and program selection.
With the continuous improvement of metal and non-metal underground mining technology and the in-novation and development of mining equipment,the mechanization level of modern large-scale underground mine construction is getting higher and higher.This article introduces the application of Sandvik DL2710 fully automatic mechanized electric-hydraulic medium-deep hole drilling jumbo in the Arden-Topkan lead-zinc under-ground mine in Tajikistan.Compared with traditional medium-deep hole construction machinery,the introduc-tion of equipment has evidently improved the construction efficiency of the medium-deep hole mining method in Tajikistan Mine Project.
In view of constantly improving of urbanization level in China,and the number of migrant workers is also increasing year by year.According to the"2022 Monitoring and Investigation Report on Migrant Work-ers"released by the National Bureau of Statistics,the total number of migrant workers in China in 2022 was 295.62 million,an increase of 3.11 million from 2021,1.1％compared to 2021,the proportion of migrant workers engaged in the construction industry is 17.1％.At present,migrant workers have become an impor-tant component of industrial workers,making significant contributions to the construction and economic devel-opment of various cities.However,compared with industrial workers,there is a significant gap in the cultural literacy,professional skills,and safety awareness of migrant workers,which can easily lead to production safety accidents due to their own unsafe behavior.This article analyzes the current situation and existing problems in safety education and training for migrant workers in construction enterprises,and then proposes countermeas-ures for safety education and training for migrant workers,aiming to continuously improve their safety aware-ness,encourage them to develop good safety behaviors,and ensure their own life and property safety.
Under the long-term erosion of high-speed water flow,the concrete of flood discharge buildings is prone to erosion,and downstream erosion pits are prone to occur.These problems are often hidden underwater and are not easily discovered,posing a threat to the safe and stable operation of hydropower stations.The tra-ditional underwater inspection technology for divers is limited by the diving time and depth,and the scope of operation is limited,making it difficult to conduct large-scale inspections of the underwater parts of hydraulic structures.At the same time,due to the complex underwater environment,divers may face life risks when working underwater.Therefore,a multi-beam sonar system and an underwater unmanned underwater vehicle were used to conduct underwater inspections of the spillway stilling pool of the Huangjinping Hydropower Sta-tion,and accurate data of the underwater flushing pit of the stilling pool was obtained through measurement.This technology breaks through the limitations of the scope of underwater inspection operations,improves work efficiency while ensuring personnel safety,and provides reliable data support for repairing underwater de-fects in the stilling basin,providing reference for similar underwater building inspections.
Combined with Jinfeng Reservoir Project of the Wudu Water Diversion Phase Ⅱ,this paper introduces the situation where the lifting mechanism of the 1 X 400 kN-35 m two-way gantry crane reverses the rotation direction of the winding rope groove,resulting in the interference between steel wire rope and the edge of hy-draulic lifting hole when the movable pulley was lowered due to the winding of the wire rope,for which the steel wire rope roller device under the drum was added to reduce the distance between upper and lower steel wire ropes.After the on-site treatment was carried out according to the remediation plan,the distance between the steel wire rope on the opening and closing motorized pulley was forcibly reduced,and the steel wire rope no longer interfered with the edge of the lifting hole after the moving pulley entered the lifting hole,the lifting load capacity of the lifting mechanism was not affected,and the lifting operated normally.It has been proved by op-eration that the steel wire rope roller with guide wheels can limit the space opening of steel wire rope.This de-sign principle can be used as reference in engineering construction where the position of steel wire rope needs to be adjusted or controlled.
The top of the gate chamber of water conservancy and hydropower projects will generally be designed with different span plate cast-in-place structure,for which the conventional construction method is full hall frame or cantilever beam pouring that has difficulties in later dismantling the formwork support system diffi-cult,safety hazards,long construction period,high cost of measures and other unfavorable factors.This paper takes the Lijiayan Reservoir as an example to illustrate the application of a new large-span cast-in-place con-crete plate structure construction method.The method can ensure that under the premise of meeting the design requirements and quality,it can reduce safety risks and construction costs,at the same time,speed up construc-tion progress.Its application has achieved good economic benefits.
2023年9月29日6时50分,随着最后一罐混凝土入仓浇筑,黄河羊曲水电站工程首台机组蜗壳混凝土全部浇筑完成,为电站实现2024年投产发电目标奠定了基础.自8月25日首仓蜗壳混凝土开仓以来,黄河公司工程建设分公司严格执行"三检"质量验收制度,强化混凝土材料性能、入仓温度、振捣时间等关键要素控制,安全高质量完成混凝土浇筑量5182立方米.
The determination of settling velocity is very important for the study of sediment transport and spati-otemporal distribution in water.In this paper,the non-uniform settling process of uniform sediment particles in the initial stage of settling is theoretically analyzed.On the basis of the existing settling test,the measure-ment of sediment particle size gradation has been done,and an improved experiment method is proposed to es-tablish a corresponding relation between settling velocity and particle size.This method considers the influence of interactions on settling velocity under the coexistence of different components of sediment and establish a good exponential function relation ω=0.0105e0.1031D between the settling velocity and particle size 0.01-0.06 mm of suspended sediment in water,which is more accurate than theoretical calculation values and traditional test method.The research results in this paper have important theoretical value and engineering significance for the research on river channel evolution and settling process after dam removal in natural rivers.
