Basic knowledge of double block ballastless trackHigh speed railway colleagues are useful!
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Basic knowledge of double block ballastless track - Figure 1
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Bidding is a competition mode in the market economy, which is usually applicable to large transactions. Its characteristics are that the only buyer (or seller) sets the target, invites several sellers (or buyers) to compete through secret quotations, selects the ones who are satisfied from many quotations, reaches a transaction agreement with them, and then realizes the target according to the agreement
Bidding is a competition mode in the market economy, which is usually applicable to large transactions. Its characteristics are that the only buyer (or seller) sets the target, invites several sellers (or buyers) to compete through secret quotations, selects the satisfactory ones from many quotations, reaches a transaction agreement with them, and then realizes the target according to the agreement.
This document is about installation quota, basic knowledge of list and list pricing, PDF document, 20 pages.This paper introduces the basic knowledge points and list pricing, and combines the practice to learn and analyze, strengthen the understanding. The content is detailed, which can be downloaded for reference by netizens.
Data Catalog Introduction to the basic knowledge and common sense of the application of floor drains and pipe fittings We are all familiar with pipe fittings, which are often encountered in daily life. The range of pipe fittings is very large, but it is less reflected in China. In Japan, there are many types of pipe fittings, no matter samples or data introduction.If you want to give a definition of pipe fittings, I think that all products of pipe fittings after deep processing should belong to the category of pipe fittings.
The contents of this paper include the following aspects: statistical standards for economic losses of casualty accidents, standards for working days of accident injury losses, classification of casualty accidents, Rules for Investigation and Analysis of Casualty Accidents of Enterprise Employees, Regulations on Report and Handling of Casualty Accidents of Enterprise Employees, Interim Provisions on Investigation Procedures of Extraordinarily Serious Accidents, Regulations on Investigation of Fire AccidentsRoad Traffic Safety Law of the People's Republic of China, steps of casualty accident investigation, composition and tasks of accident investigation team, and common technical methods of accident investigation.
The surface layer of subgrade bed in this section is 40cm thick and filled with graded crushed stone. The transition section of road and bridge is filled with graded crushed stone containing 3~5% cement. The bottom soil of subgrade bed is filled with improved soil containing 5~7% cement. The subgrade foundation is treated with cement soil compaction piles, column hammer expansion piles, CFG piles. The pile top is paved with a 0.8-1.0m thick 28 lime soil cushion with two layers of two-way geogrid with tensile strength not less than 80KN/m.
This information is about the construction of CRTS I double block ballastless track with the track frame method. CRTS I double block ballastless track is a ballastless track structure designed by our country, which uses WJ-7 fasteners developed by the Academy of Railway Sciences.The track frame construction method can improve the accuracy level of process control, and has the characteristics of programmed construction, convenient management accuracy control and accelerating the project progress.The complete set of tooling equipment mainly includes: double beam type combined track bent (or single beam type combined track bent), gantry crane, mobile assembly platform, rail bent hanger, etc.
In order to determine the reasonable stiffness of the double block ballastless track, a method combining quasi-static and dynamic response analysis is proposed to determine the reasonable stiffness of the double block ballastless track by comprehensively comparing and selecting multiple track stiffness schemes within a reasonable range according to the stress, deformation and vibration level control indicators.The finite element method and the vehicle track coupling dynamic theory are used to establish the quasi-static calculation model of double block ballastless track for stress and deformation analysis, and the impact of the fastener stiffness of ballastless track on the dynamic response of the wheel rail system is analyzed.The results show that for 250 km/h and 350 km/h double block ballastless tracks for passenger dedicated lines, the fastener stiffness should be in the range of 35-45 kN/mm and 20-25 kN/mm respectively.
This method is applicable to railway tunnels, urban subways and other projects using TYYGZ --- I double block ballastless track monolithic track bed (construction conditions can be met as long as there are horizontal constraints on both sides or horizontal constraints can be formed).
The construction of double block ballastless track in this test section starts from XX268+196.99 and ends at XX269+475.36, with a total length of 1278.37m, including two road bridge transition sections of xx grand bridge and xx grand bridge.The surface layer of subgrade bed in this section is 40cm thick and filled with graded crushed stone. The transition section of road and bridge is filled with graded crushed stone containing 3~5% cement. The bottom soil of subgrade bed is filled with improved soil containing 5~7% cement. The subgrade foundation is treated with cement soil compaction piles, column hammer expansion piles, CFG piles, and the pile top is paved with 0.8~1.0m thick piles
Understand the basic knowledge points of structure and equipment specialty, help us complete the building scheme and construction drawing design more accurately and effectively, so as to improve work efficiency.
Chapter I Basic Knowledge of Relay Protection 3 Section I Current Transformer 3 1, Polarity Experiment 3 2, Transformation Ratio Experiment 3 3, Voltage ampere Characteristics of Winding 3 Section II Voltage Transformer 4 Section III Gas Relay 4 Section IV Label of Secondary Circuit
This document is an introduction to steel structure drawings, including basic knowledge of construction drawings, node details, etc., which is comprehensive and detailed for your reference.
Cold storage cost, installation specification, maintenance and engineering prospect.Give you advice.I hope it is helpful to you.Mobile: 18930728669 Contact person: Miss Liu Tel: 021-67896862 Company Fax: 021-67896862 qq: 1586242651 Email:1586242651@qq.comBingyan Refrigeration Project:http://www.zlcold.com
1、 Introduction to Wallpaper① Wallpaper, in "roll", common specification: 0.53m wide × 10m long=5.3m2.② Wallpaper is divided into parquet and non parquet. The parquet wallpaper is required to be matched when paving, and the loss is relatively large, with a loss rate of 5% - 10%.③ Main material cost of ordinary wallpaper, 103 yuan/roll;19-20 yuan/square meter.④ Main material cost of mid-range wallpaper, 210 yuan/roll;39-40 yuan/square.⑤ The general estimate is 2.5 to 3.5 times the floor area of your room.
Steel structures are usually used in high-rise, long-span, complex structures, structures with large load or crane lifting capacity, large vibration, and structures requiring mobility or frequent assembly and disassembly
160;Construction production is characterized by fixed products, personnel flow, and mostly open air and high-altitude operations. The construction environment and operating conditions are poor. Unsafe factors change with the change of project image progress, with poor regularity and many hidden dangers.Therefore, the construction industry is one of the industries with frequent accidents. As the main force of urban construction, our construction enterprises, while promoting social progress and urban construction, pursue the maximization of benefits is the most fundamental goal of our construction enterprises.However, safety is benefit, safety is our lifeline, and safe production is the best explanation to our country and our people.
Building steel structure has the advantages of light deadweight, short construction period, strong adaptability, rich appearance, convenient maintenance and so on, and its application is more and more extensive.Since the 1980s, China's building steel structure has been developing unprecedentedly. In 2005, China has become the world's largest steel producer and steel consumer. The annual steel consumption has exceeded 300 million tons, of which the output of steel structure is up to 140 million tons. The steel structure industry, including energy, transportation and infrastructure construction, has become the pillar of national economic construction.
The road is crossing rivers and lakes!Mountains, rivers and other routes, roads and railways need to build bridges. "On the one hand, it can ensure the traffic operation on the bridge, # on the other hand, it can ensure that water can be discharged under the bridge! The navigation of ships or roads! The operation of railways
Generally, a connecting pipe is connected to a rain water bucket, so the diameter of the connecting pipe is generally the same as that of the rain water bucket.The more the number of connected rainwater buckets, the greater the aeration of rainwater buckets and the greater the flow resistance;The farther from the rainwater hopper to the riser, the greater the flow resistance and the smaller the discharge of the suspended pipe.When only one suspension pipe is connected to the riser, the diameter of the riser shall not be less than the diameter of the suspension pipe, which can be the same as the diameter of the suspension pipe.The diameter of the discharge pipe is generally the same as that of the riser, which does not need to be calculated separately. If the diameter of the No. 1 pipe is increased, the hydraulic condition of the pipeline drainage can be improved, and the drainage capacity of the riser can be increased.The buried pipeline is calculated according to gravity flow, and the hydraulic calculation method of building drainage horizontal pipe is adopted to control the maximum calculated fullness and minimum gradient.The minimum diameter of buried pipeline is 200 mm.
The construction drawing is the "language" of the engineer, the embodiment of the designer's design intent, and the important basis for construction, supervision and economic accounting.The structural construction drawing plays an important role in the whole design, and we must not be hasty.
In order to better carry out the corresponding work, we will provide some basic knowledge about the accurate pole of current transformer. While we continue to learn, we will continue to update and supplement it later.
Basic knowledge training of construction lifts of China Construction Second Engineering Bureau Basic knowledge training of construction lifts of China Construction Second Engineering Bureau Basic knowledge training of construction lifts of China Construction Second Engineering Bureau