The technical regulations for the construction of the lighting and chasing mirror system are officially released.

The "Technical Regulations for Construction Lighting Pursuit Mirror System" (JGJ/T295-2013) was released recently. As the first industry standard, this regulation provides a comprehensive technical basis for the production design and construction of the architectural lighting chasing mirror system (hereinafter referred to as the lighting chasing mirror), filling the domestic gap. Although the light chasing mirror has been popular abroad, it is still a new term in China. What is the secret of it? Why should we introduce such a standard? On this topic, the reporter interviewed Hua Jianmin, associate professor of Chongqing University and director of the construction teaching and research section of the Civil Engineering Institute.
Energy-saving weapon for chasing the sun China's building energy efficiency level lags far behind that of developed countries. The thermal function of the envelope structure in most heating areas in China is much worse than that in developed countries with similar climate. The energy consumed per unit area of ​​heating is equivalent to 23 times that of developed countries with similar latitudes. Developing energy-efficient building technologies and reducing energy consumption in building buildings are important for solving energy problems. Hua Jianmin believes that.
Among the many renewable clean energy sources, solar energy has great advantages. Compared with the limited nature of conventional energy sources, solar energy has unlimited reserves and is inexhaustible. And solar energy has a true universality, will not produce pollution, with the use and high economic efficiency. Therefore, the prospects for solar energy in energy conservation and energy replacement technologies are generally optimistic.
The invention of the light chasing mirror came into being, and it was timely.
Hua Jianmin introduced that the light chasing mirror has the function of detecting sunlight and adjusting the steering according to the angle of sunlight. It can reflect sunlight to a designated area and consists of four parts: chasing mirror, mirror, control box and astigmatism. The accurate positioning of the mirror and the mirror base realizes the installation of the chasing mirror and the mirror. At the same time, the control box and the follow-up mirror are connected together by a cable. Through the debugging control of the control box, the best chasing mirror is determined for the sun. The angle, so as to maximize the reflection of light to the mirror, through the reflection of the mirror and the scattering of the astigmatic lens, the sunlight inside the building is sufficient.
Talking about the advantages of the chasing mirror, Hua Jianmin cited the most important three: First, the chasing mirror can provide natural light for the building interior. The technology effectively utilizes sunlight illumination to increase the natural atmosphere in the building. The purpose of natural light source instead of artificial light source is to reduce the artificial lighting in the use area and reduce the amount of electrical installation of lamps, pipelines, switches, etc. Second, the green natural energy utilization system. The technology meets the requirements of environmental protection and energy conservation, can greatly reduce the energy consumption within the system, and is an ultra-low energy green energy lighting system. This natural energy utilization system will be one of the development trends of environmental protection and energy conservation projects in the future; third, it will save the maintenance, replacement, cleaning and energy consumption costs of the corresponding electrical lighting systems brought by the later use.
New technology calls for standardization However, as a new technology for green energy conservation and environmental protection, the application of the light chasing mirror is not yet mature. The main problem is reflected in the special working methods of the architectural lighting chasing mirror system (detecting sunlight, changing angles, etc.), so that the buildings using this system have many special requirements compared to ordinary buildings. These special requirements will be designed for the whole building. And construction has a great impact, even constraints. Hua Jianmin said.
When a lighting chase mirror is set up in a new, rebuilt and expanded building project, its design should be incorporated into the architectural design. In the architectural design, conditions should be set for setting the lighting chasing mirror, and when adding the lighting chasing mirror to the existing building, it is necessary to consider whether it will affect the structural safety of the house. The construction and installation plan of the lighting chase mirror project should ensure that the system can achieve the expected design effect.
Hua Jianmin further pointed out that in the process of popularization and use of the light chasing mirror, the lack of corresponding implementation standards in China has restricted the use and promotion of the technology to a certain extent.
In the absence of relevant construction techniques and acceptance regulations to guide the current situation of lighting chasing mirror construction, in 2012, the preparation of the "Technical Regulations for Construction Lighting Chasing Mirror System Construction" began, China Construction Third Bureau Second Company, Chongqing University, Wuhan University, Shenyang Construction The University, Central South Architectural Design Institute and related units participated in the preparation. In October this year, the Ministry of Housing and Urban-Rural Development issued the “Technical Regulations for Construction Lighting Chasing Mirror System Construction”, which will be implemented on April 1, 2014.
The road to comprehensive promotion is still long. At present, the application of the chasing mirror is mainly in developed countries in Europe. It is relatively backward in China and there are few manufacturers. We also use German products. Chen Xinan, deputy chief engineer of China Construction Third Bureau, told reporters that as the first company in China to use the light-seeking mirror technology in the project, the company has successfully completed the construction project of the light-seeking mirror and formed a provincial-level construction method. Due to its rich experience in building construction, China Construction Third Bureau Second Company became the first editor-in-chief of the “Technical Regulations for Construction Lighting Chasing Mirror System Construction”.
After the formal implementation of the procedures, it can play a good guiding role for the industry. However, people generally have a misunderstanding about the use of light-seeking mirrors. One is that they don't know about this technology, and the other is that people who know it are not willing to apply it. Chen Xin'an introduced that we made a comparative calculation that the hypothetical product is pure imported equipment. Although some investment is required in the early stage, the cost in the later period is not much, and it can be recovered in about ten years.
As a green energy-saving and environmental protection technology, the promotion and use of the light-seeking mirror may be restricted by factors such as imperfect national green environmental protection regulations, green buildings, green construction and low implementation. Hua Jianmin has deep feelings about this.

Dredging is an excavation activity usually carried out underwater, in shallow seas or freshwater areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable. It is also used as a way to replenish sand on some public beaches, where sand has been lost because of coastal erosion. Dredging is also used as a technique for fishing for certain species of edible clams and crabs (see fishing dredge).

Photo of our  Dredger :

Types of dredging vessels
Suction
The dredge Drag Head of a suction dredge Barge on the Vistula River, Warsaw, Poland
The Geopotes 14 lifting its boom on a canal in The Netherlands. (gēopotēs is Greek for "that which drinks earth")
For suction-type excavation out of water, see Suction excavator.
These operate by sucking through a long tube, like some vacuum cleaners but on a larger scale.
A Plain Suction Dredger has no tool at the end of the Suction Pipe to disturb the material. This is often the most commonly used form of dredging.[citation needed]

Trailing suction
A trailing Suction Hopper Dredger (TSHD) trails its suction pipe when working. The pipe, which is fitted with a dredge drag head, loads the dredge spoil into one or more hoppers in the vessel. When the hoppers are full, the TSHD sails to a disposal area and either dumps the material through doors in the hull or pumps the material out of the hoppers. Some dredges also self-offload using drag buckets and conveyors.

The largest trailing suction hopper dredgers in the world are currently Jan De Nul's Cristobal Colon (launched 4 July 2008) and its sister ship Leiv Eriksson (launched 4 September 2009. Main design specs for the Cristobal Colon and the Leiv Eriksson are: 46,000 cubic metre hopper and a design dredging depth of 155 m.[3] Next largest is HAM 318 (Van Oord) with its 37,293 cubic metre hopper and a maximum dredging depth of 101 m.

Cutter-suction
A cutter-suction dredger's (CSD) Suction Tube has a cutting mechanism at the suction inlet. The cutting mechanism loosens the bed material and transports it to the Suction Mouth. The dredged material is usually sucked up by a wear-resistant centrifugal pump and discharged either through a pipe line or to a barge. Cutter-suction dredgers are most often used in geological areas consisting of hard surface materials (for example gravel deposits or surface bedrock) where a standard suction dredger would be ineffective. In recent years, dredgers with more powerful cutters have been built in order to excavate harder rock without the need for blasting.

The two largest cutter suction dredgers in the world are currently (as at August 2009) DEME's D'Artagnan (28,200 kW total installed power)and Jan De Nul's J.F.J. DeNul (27,240 kW).both built by IHC Merwede.

Auger suction
This process functions like a Cutter Suction Dredger, but the cutting tool is a rotating Archimedean screw set at right angles to the suction pipe. The first widely used auger dredges were designed in the 1980s by Mud Cat Dredges, which was run by National Car Rental, but is now a Division of Ellicott Dredges. In 1996, IMS Dredges introduced a self-propelled version of the auger dredge that allows the system to propel itself without the use of anchors or cables. During the 1980s and 1990s auger dredges were primarily used for sludge removal applications from waste water treatment plants. Today, auger dredges are used for a wider variety of applications including river maintenance and sand mining.

The most common auger dredge on the global market today is the Versi-Dredge. The turbidity shroud on auger dredge systems creates a strong suction vacuum, causing much less turbidity than conical (basket) type cutterheads and so they are preferred for environmental applications. The vacuum created by the shroud and the ability to convey material to the pump faster makes auger dredge systems more productive than similar sized conical (basket) type cutterhead dredges.

Dredger

Cutter Suction Dredger,Bucket Dredger,Grab Dredger,Trailing Hopper Suction Dredger

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