The electrical engineer shall be highly responsible for the quality of the electrical engineering in charge, and make full use of his professional level to thoroughly and meticulously manage the technical, quality, schedule and safety of electrical engineering. Electrical engineers must also participate in project bidding, coordination of various relationships, etc., such as the installation of power systems in coordination with power companies, design changes between design units, construction units, and construction.
The electrical engineer should pay attention to the problems in the design review and drawing review stage to check whether the design drawings meet the relevant specifications or relevant technical quality standards, and whether the design is reasonable and optimized.
General simply supported bridge, T-beam or continuous beam structure audit grounding system: whether the longitudinal reinforcement of the bridge deck is connected, how the bridge pier and the bridge deck are connected, and the relative movement of the bridge deck and the pier after thermal expansion and contraction are reliable and connected. Whether the wire or steel bar meets the grounding requirements and how the expansion joint is connected; audit the street lamp system: whether the street lamp hand hole, the lamp holder and the lamp pole meet the anti-corrosion needs of the marine climate, whether the lamp holder and the grounding net are connected reliably, and whether the street lamp hand hole cover is sealed Etc.; review the bridge and culvert system under the bridge: whether it meets the requirements for the embedded parts of the "China Sea Area Water Navigation Sign" (GB4696-99) sign, whether the anti-corrosion requirements of the embedded parts are suitable for the marine environment, for the pre-use of signs It is convenient to embed the embedded parts of the buried wire pipe and the bridge and culvert control box.
In addition to reviewing the above projects, cable-stayed bridges and continuous suspension bridges also need to review the setting of aviation obstacle lights according to the Technical Standards for Civil Airport Flight Zones (MH5001-2000), Aviation Obstruction Light Standards (MH/T6012-1999) and National Civil Aviation. The regulations for setting up aviation obstacle lights are: the medium-light obstacle light is red flash, the effective light intensity is 2000cd±25%; the high-intensity obstacle light is white flash, and the effective light intensity is 200000cd±2%.
The main navigation bridge tower tower should be marked with the highest point and the most edge (ie, the height and the width of the line) for the obstacle light. The two main towers are equipped with an uninterruptible power supply for the aviation obstacle lights for 24 hours. Device. The aviation obstacle light stainless steel bracket (grade: 0Cr26Ni5Mo) and the luminaire should meet the requirements of strong typhoon, and the design of the aviation obstacle light should be submitted to the main design unit for review, so as not to affect the main structure, and it should be reviewed whether the future installation and maintenance is convenient.
Review the lightning protection design of the bridge tower and the "Code for Lightning Protection of Buildings" (GB50057-94, 2000 edition), "Technical Specifications for Lightning Protection of Building Electronic Information Systems" (GB50343-2004), and the Protection of Lightning Electromagnetic Pulses Part 2: Building Shielding, Internal Equipotential Bonding and Grounding (GB/T19271.2-2005/IECTS61312-2:1999) and the "Electrical Installation Engineering Construction and Acceptance Specifications" (GBJ232-92) and other countries related The design standards are consistent, and it complies with the “Meteorological Law of the People's Republic of Chinaâ€, the “Measures for the Protection of Lightning and Disaster Mitigation†of the China Meteorological Administration, and the “Regulations on the Prevention and Mitigation of Light and Disaster Mitigation in Zhejiang Provinceâ€.
The review of the bridge's nightscape lighting landscape is based on the idea of ​​adding color to the main body design, without affecting the structure of the main building (the Zhoushan Liandao project is on the vast east sea surface. If the wind surface is increased due to good looks, the reliability of the bridge will be greatly reduced. ), the setting of the landscape should be simple and elegant, suitable for the local historical and cultural environment, and easy to maintain and manage.
Whether the design review of monitoring, communication, charging, power supply and load limiting systems meets the "Zhejiang Expressway Operation Management Measures" (Provincial Government Order No. 193), "Zhejiang Expressway Network Operation Monitoring and Management Measures (Trial)" Jiao [2005] No. 111, "Zhejiang Expressway Networking Toll System Planning and Design" and other related technical requirements and construction requirements.
The design review and audit system of the monitoring system can accurately and timely collect various information such as traffic flow, traffic environment and operating status of major traffic facilities, can accurately detect and confirm traffic events, and quickly provide the location of accident information, illuminance detection and meteorological detection installation. Can provide more accurate information. Whether the management center can quickly start lighting and sealing procedures; whether the camera (PTZ) installation orientation and height meet the monitoring scope, and whether the key sections strengthen monitoring (such as bridge piers, pylons and navigation channels). Perform necessary monitoring and linkage control on the public safety precaution system, fire automatic alarm and fire linkage control system operating conditions to monitor the operation of elevators and escalators.
The air handling system in the steel box girder should be able to monitor the following parameters: fan status display, return air temperature measurement, indoor temperature and humidity measurement, filter status display and alarm, air duct wind pressure measurement, start and stop control, overload alarm.
The power supply equipment monitoring system should be able to monitor the following functions: power distribution equipment and high and low voltage main switch operating condition monitoring and fault alarm, power supply and main power supply loop current value display, power supply voltage value display, power factor measurement, energy metering, transformer Over-temperature alarm, emergency power supply current, voltage and frequency monitoring, power system computer-aided monitoring system should have a communication interface.
The lighting system should monitor the following functions: garden light control, floodlight control, road lights, foyer, stair and walkway lighting control, parking lot lighting control, aviation obstacle light status display, fault alarm, intelligent lighting control system in important places.
Communication interfaces with automatic fire alarm systems, public safety systems and garage management systems should be maintained.
The principle of LAN construction is: 1 The work sites with similar information processing functions are connected in the same network; 2 The work sites with similar geographical locations are connected in the same network; 3 The data traffic load is as balanced as possible to avoid overweight or Too light; 4 should have a certain margin to facilitate expansion and adjustment of network efficiency.
The design of the communication system verifies whether the optical cable meets the national standard, whether the steel pipe meets the anti-corrosion requirements, and whether the optical cable crosses the highway to protect the steel pipe. Communication emergency power supply should fully meet the needs of 72 hours.
The design review of the toll system is to set up an image surveillance camera system at the entrance of the expressway. It specifically captures the condition of entering the vehicle and reflects the vehicle load parameters. If there are several axles, models, etc., the fare is directly printed after computer operation. Avoid manual error or release of human vehicles. At the exit, an image surveillance camera system is also set up, which specifically captures the condition of the outbound charging of the vehicle, further checks the vehicle load parameters, and directly releases the data after the computer operation, and releases the charge after the charge is reduced.
In order to speed up the traffic speed of the car, a camera system for automatic identification of the license plate is set up at the entrance of the toll. The computer image processing technology is used to analyze the image of the license plate, the license plate information is automatically extracted, the car number is determined, and the information is compared with the information searched on the Internet. Yes, such as vehicle load, model and several axles. This will speed up the charging and increase the accuracy of the charges.
A special monitoring wall is set up, and the inbound and outbound vehicles of each lane can be displayed on the monitoring wall for monitoring by the monitoring personnel, and the behavior of the tolling personnel is also within the monitoring range of the monitoring personnel. At the toll booth, two separate systems should be set up, one for the fee and one for the monitoring. In order to avoid a situation of harmony, it is necessary to set up a surveillance wall for the stationmaster and the toll company. This has an invisible supervisory role for the toll collector and is of great significance for ensuring the accuracy of the charge.
On the basis of absorbing advanced technology at home and abroad, we maintain relative continuity, advancement and forward-looking. Especially for the design of monitoring, communication and charging systems, due to the comprehensive system, fast product replacement, and high investment risk, careful implementation should be considered. It is necessary to examine whether the design reflects the principles of engineering economy and construction convenience. Many mature technologies and materials are reflected and applied in this project. Designed and selected products should be open-ended, allowing for system expansion, interconnection, and information sharing when conditions permit. Whether the monitoring, communication, and charging systems are consistent with the main engineering design, and match each other.
The design of the power supply system reviews whether the important equipment has backup power, whether it can monitor the operation of the power transformer, and whether the transformer power supply radius is too large. Buried transformers are generally connected by hand. Once a transformer is struck by lightning, the lightning wave may continue to invade the next one, and the use of the arrester meets the requirements.
Whether there is an electrical interface on each beam section, each beam section may be repaired over time, and must be used for repair, maintenance, and other purposes, such as lighting, welding, and other uses. Interference from strong electrical equipment to weak electrical equipment may cause chaotic operation of the weak current system. Therefore, relevant measures must be considered. For example, strong and weak electrical equipment are arranged separately, the lines are laid separately, and the communication equipment room should not be installed near the substation.
Design of the load-limiting system The bridge's load-limiting system should be more stringent than the roadbed's load-limiting, because once the vehicle is overloaded, it may threaten the safety of the bridge and cause greater damage to the country.
Quality Control of Electrical Engineering The quality of electrical engineering directly affects the normal operation of the building function and affects the social and economic benefits of the building. The quality control electrical engineer in the construction preparation stage can not only stay at the level of construction according to the drawings, but should be fully familiar with the design drawings, work hard and be good at finding the deficiencies in the drawings, and promptly put forward treatment opinions.
Good project quality is completed by high-quality and high-level construction personnel. This requires the construction team and personnel to be assessed and evaluated before construction, and the proportion of skilled workers and general workers is adjusted according to the contract. The mechanic must be certified to work. The electrical engineer shall prepare the construction organization design (construction technical plan) according to the actual situation of the project and strictly review it, and require a perfect quality assurance system to ensure that the technical measures of the project quality are in accordance with the design drawings reviewed by the meeting, as well as the current national electrical related Construction and acceptance specifications for the project. The organization and design personnel shall carry out the overall technical disclosure of the engineering personnel of the construction unit, and the designers of the key parts shall be present to the scene. Due to the large mobility of the construction personnel, the construction personnel shall also be submitted in stages according to the progress of the project. Clarify current practical specifications and operating procedures and procedures. We are well aware of the data forms and related technical documents, requirements and standards required for the project. All materials and equipment in the project are examined and confirmed to create conditions for the next step. According to the overall progress of the owner and civil engineering, the electrical engineering schedule, personnel plan, machine tool plan and organization and implementation shall be prepared. The project process shall be revised and supplemented in time according to the actual situation.
The quality control construction during the construction phase must be based on the electrical design drawings and relevant technical documents after the review, in accordance with the current national electrical engineering construction and acceptance specifications, local regulations and documents related to project construction, approved construction organization design (construction technology) Plan) proceed. If the drawing problem is found in the construction, it should be promptly proposed and dealt with, and it is not allowed to change the design without consent. It is required to strictly implement and implement the "three inspections" system, key parts, and implement side station supervision. Strictly implement standardized operating procedures and prepare quality control procedures that conform to specifications, process standards, and operations. Usually pay attention to the timely collection and organization of information, especially the concealed project acceptance data and hidden visa. Without the signature of the relevant personnel on the concealed acceptance form, the next process shall not be carried out to prevent the supervision from flowing in the form. Record the construction log.
During the main construction phase, pay attention to the following issues: a. Strictly control the quality of electrical pipes and reject unqualified materials outside the project. Such as galvanized steel pipe wall thickness, thick pipe is not less than 2.5mm, thin pipe is not less than 1.5mm, galvanized layer should be intact, galvanized layer thickness is at least 80μm; PVC pipe should be medium or above, generally use heavy pipe, must be resistant Fuel type. Every time the construction unit enters the materials, it should be filled out for review and approval. After the supervision and examination, the owner can use it for the project. The owner can check the various equipments every time, and if it is not qualified or does not conform to the design requirements, it will be returned. b. In order not to affect the structure and ensure the thickness of the protective layer, the pre-embedded electric wire pipe shall not be laid on the outer side of the steel bar; the steel pipe embedded in the anchorage of the Xiqiaomen Bridge and the cable tower shall not be arranged in bundles, and should pass through the steel gap in a small area. Arrange to avoid cutting off the steel bars; no more than three crossings at the same place, the line pipes cannot be tied together side by side; the position of the pre-buried pipes should be avoided and the position of the transversely prestressed steel beam tensioning end and the anchoring end anchorage of the box girder roof should be in conflict. c. Ensure that rainwater does not enter the pipeline and flow into the concrete box girder. The nozzle should be inclined outward. d. A 400mm long (outer concrete extension 150mm), nominal diameter 16×3mm stainless steel pipe (1Cr18Ni9Ti) is used as a drain pipe in the vertical direction of the bottom of the hand hole of the approach bridge. This pipe must be compared with the concrete box girder in the hand hole. The lower edge of the transverse nozzle is low. This kind of stainless steel tube is used in Zhoushan of the marine climate, and its anti-corrosion performance is good, and the post-work is small. e. Aviation obstacle light installation brackets must be manufactured a few months in advance, and galvanized according to design requirements, and then pre-buried according to the progress of the main body. f. The grounding pole and grounding lead must be inspected with the supervisor or the owner's electrical engineer before the concrete is poured. The equalizing ring, the lightning protection belt and the lightning protection down conductor are very important to the safety of the building. Whether the welding length and quality meet the specifications And design requirements, whether it is leak welding. Every place must be carefully inspected, especially the bridge deck structure and the pier transition layer. Due to the adjustment of the pillar main ribs, the lightning protection down conductor is easy to be mis-welded or leak-welded. Therefore, the electrical engineer should remind the supervisor and the construction personnel to pay attention. This is also the supervision inspection content. The focus must be carefully checked to ensure the quality of the project. g. The connection between the tube and the tube, tube and box should be firm and tight. To prevent clogging, the ligature must be firm. Before pouring concrete, it is necessary to check the joint weld of the steel pipe one by one, whether there is a gap, if it is immediately filled, otherwise the whole pipeline will be scrapped once the concrete mortar leaks. h. The spacing of the strong and weak wire boxes should meet the requirements. The cable pipes in the subgrade or the central separation zone are generally PVC pipes, and a hand hole is made every 50m or a cable connection is placed at the junction of each bridge. box. Before pouring concrete, each cable connection box should be filled with sand and then poured into concrete. Each person is required to follow the shift every time, and the leaky cable and cable connection box should be dealt with in time. i. Check the cable tray wall thickness and galvanizing thickness. j. Selection of communication tubes, steel pipes for bridges or highways, and PVC pipes for other central dividers.
During the installation and commissioning phase, pay attention to the following problems. 4.2.2.1 Transformer and Distribution System Facilities First, make a sample of the pressure line inside the distribution box and cable connection box, require neat wiring, firm crimping, multi-strand wire, and then comprehensive Expand. The connection of the grounding wire and the reservation of the grounding terminal shall comply with the requirements of the code; the metal doors and windows of the external wall, the railings and the large metal parts of the roof shall be used as the key part of lightning protection, and the process connection shall be made to prevent omission; the grounding of the equipment casing shall be perfect. The work is required to be carried out according to the procedure. For example, all cables, plug-in busbars, wires and equipment must pass the insulation test and pass the power transmission. The operation and commissioning of the equipment shall be carried out according to the load after the first no-load and the first unit. Adjustable components such as thermal relays should be adjusted to the specified values, and the commissioning operation should continue for a specified period of time to verify the reliability of electrical and mechanical performance. Focus on the inspection of the wiring inside the ceiling, the wire laying pipe must meet the requirements.
In the commissioning of generator self-starting, switching from mains, and switching between dual power supplies, problems often arise due to lack of attention or poor coordination between work types. For example, some projects have experienced diesel generators with no load, only because the setting value of the switch is not set according to the design requirements; the dual power supply terminal switching box cannot be automatically switched when the generator is powered, only because the secondary circuit transfer switch is not hit. To the automatic position; the generator power supply loop does not check the phase sequence, and the motor reverses because the phase sequence is reversed.
The control of the fire pump is controlled by the step-down start, on-site manual, fire control room manual, automatic start, standby mutual investment, etc., and often involves several installation and commissioning (supply) units, which are easy to occur technically and cooperatively. Problems, plus small defects in individual designs, affect commissioning and acceptance. Electrical engineers must be familiar with the design drawings and the main wiring diagrams and control schematics provided by the manufacturer in advance, and discover and anticipate possible problems and deal with them. This part of the commissioning is critical, and sometimes a small problem will affect the acceptance of the entire fire engineering. Lighting system inspection items: the categories, specifications, applicable places, effective range, quantity, location, installation spacing, installation quality, etc. of the illuminators and brightness sensors in the lighting system meet the requirements; the power line and signal line connection quality of the control equipment meet the requirements; Street lighting, bridge landscape lighting, aviation obstacle lights and other facilities are complete and coordinated; high pole lights are supplied by units that have obtained the corresponding qualifications, and have reliable test records, and valid equipment inspection reports or certificates are complete.
Test items: the working grounding resistance of street lamp equipment is ≤ 4Ω, the grounding resistance of street lamp pole is ≤ 10Ω; the verticality of lamp pole is ≤ 5mm/m (measured by theodolite); the straight line, turning, bridge, overpass, toll plaza and toll in the section Illumination is uniform in the ceiling and other places (illuminance meter); brightness sensors, lamps, timers, etc. are linked to each other.
Monitoring facility inspection items: the number, model and specifications of the vehicle detector and its accessories meet the requirements; the specifications of the CCTV monitoring system equipment and accessories meet the requirements, the position is installed correctly, the equipment commissioning record and the valid equipment inspection report or certificate are complete; The position of the sign is installed correctly, the column is installed vertically and firmly, the lightning protection component is installed in place, the display is in a controlled state; the monitoring computer equipment is installed and debugged, the system is running normally, and the network cable, socket, connector, router, modem, server, etc. And the quantity meets the design requirements.
Test and inspection items: measured with a 500V megger, all the monitoring facilities' strong electrical terminals should have a casing resistance and a safe grounding resistance of more than 50MΩ and less than 4Ω respectively. Using the radar speedometer and the traffic data acquisition instrument to check the vehicle detector to measure the vehicle speed accuracy, the error is less than 5% (km/h); the closed channel television monitoring system transmission channel indicator is sent by the TV signal generator 2T signal, and the video tester is used to detect the echo The brightness and chromaticity meet the design requirements. The actual operation of the pan/tilt, zoom, wiper and other conditions meets the design requirements; the brightness of the variable sign display is measured by the brightness meter to meet the design requirements, and should be greater than 8000 cd/m 2 when not specified; The road impedance, far (near) end crosstalk and attenuation ratio are in accordance with the communication industry standard: "General Test Method for Electrical Characteristics of Integrated Wiring Systems" (YD/T1013-1999).
The progress control of electrical engineering is pre-buried in parallel with the main project, such as street lamps, aviation obstacle lights, cameras, signs and lightning arresters, cable tubes and monitoring equipment optical cable tubes to avoid repeated construction, saving money and ensuring appearance. Pretty. The main tower of Xiqiaomen Bridge is completed, and the main cable erection is completed. Aviation obstacle lights and tower top arresters must be installed to ensure the safety of bridge construction. During the manufacture of steel box beams, cable trays and box girder dehumidification systems are installed to avoid equipment after completion of the bridge. The installation is inconvenient and the construction difficulty is increased. During the roadbed excavation process, the pipeline construction scheme of the communication and streetlight system along the road is determined; the marine navigation light is installed synchronously during the installation process of the steel box bridge of the main project, so that the navigation standard of the navigation channel; After the beam is completed, the power system, lighting system, traffic sign, monitoring system and charging system are installed.
| About Glass Fiber Film Covered Flat Aluminium Wire |
Flat Fiber glass wrapped Aluminium Wire for winding machine
Copper or Aluminum rectangular Wire
Narrow side size a : 0.80mm-5.60mm
Broad side size b : 2.00mm-16.00mm
Copper or Aluminum Round Wire
Diameter:φ1.7-φ5.0
If specification is out of range, please
Glass Fiber Film Covered Flat Aluminium Wire
Flat Copper Wire,Glass Fiber Film Covered Flat Aluminium Wire,Flat Aluminium Wire,Glass Film Covered Flat Wire
HENAN HUAYANG COPPER GROUP CO.,LTD , https://www.huaonwire.com