The emergence of cloud computing technology has made the construction of data centers present a trend of large-scale and intensive. As a pioneer in the field of data centers, the ISP industry has stepped into it one after another. Generally speaking, a data center consists of the following systems.
1. Fire fighting system
The machine room should be equipped with a gas extinguishing system. The gas cylinder room should be set outside the machine room. It is a pipe network structure with nozzles on the ceiling. The fire alarm system is composed of a fire control box, smoke detectors, and temperature detectors. The fire-fighting system of the machine room should adopt a gas fire-fighting system, and the commonly used gases are heptafluoropropane and sde.
2, precision air conditioning system
The task of the precision air conditioning system in the computer room is to ensure the continuous, stable and reliable operation of the equipment in the computer room. It needs to discharge the heat emitted by the equipment and other heat sources in the computer room, maintain the constant temperature and humidity in the computer room, and control the dust content of the air in the computer room. For this reason, the precision air-conditioning system of the computer room is required to have the ability of air supply, return air, heating, humidification, cooling, dehumidification and air purification. The precision air-conditioning system of the computer room is an important equipment to ensure a good environment of the computer room, and a constant temperature and humidity precision air-conditioning system should be adopted.
3. Monitoring and access control system
There are a large number of servers, cabinets, and racks in the monitoring room. Because cabinets and racks are generally taller, there are many dead spots for monitoring. Therefore, each entrance and exit is mainly considered when TV monitoring is arranged, and cameras are installed between each row of cabinets.
If the space at the entrances and exits is relatively large, a camera with zoom can be considered. Between each row of cabinets, a fixed-focus camera can be equipped according to the monitoring distance. If there are multiple rooms in the computer room, consider installing cameras in the UPS room and the control room.
The computer room access control system mostly uses a non-contact smart IC card integrated management system. The system can flexibly and conveniently specify the personnel, time, and authority to enter the computer room, prevent damage caused by human factors, and ensure the safety of the computer room.
4, shielding system
Electromagnetic interference has a great impact on computer equipment, ranging from misoperation and data loss to the worst, making the computer unable to work.
Computer room shielding mainly prevents various electromagnetic interference from damaging the equipment and signals in the computer room. There are two common types: metal mesh shielding and metal plate shielding.
5. Grounding system
A good grounding system should be installed in the computer room to make the power supply have a stable zero potential. As the reference voltage of the power supply system voltage, there is a good grounding wire. When the power supply voltage and signal in computer transmission encounter or produce various interferences, they can be filtered out by high and low frequency filter capacitors. In addition, when encountering lightning, strong power sources near the cabinet, and electric spark interference, a good grounding system in the computer room should be able to protect the computer. Therefore, it is very important to design a good computer room grounding system.
(1) DC grounding: This grounding system grounds the power output through the grounding grid to make it a stable zero potential. This power ground wire is directly connected to the earth and has a small grounding resistance.
(2) AC grounding: This grounding system connects the ground wire of the AC power source with the grounding point of AC electric equipment such as motors and generators, and then connects to the ground.
(3) Safe ground: In order to shield external interference, leakage and electric sparks, all computer cabinets, cases, casings, panels and motor shells need to be grounded and shielded, and the system can be a safe ground.
General requirements: DC ground resistance is less than 1 ohm, AC ground resistance is less than 4 ohms, and safety ground resistance is less than 4 ohms. AC working grounding, safety protective grounding, DC working grounding, and lightning protection grounding should share a set of grounding devices, and the grounding resistance should be less than 1 ohm. The connection mode of the grounding system can be selected according to the geographical characteristics of different connection modes: radial, ring or grid matrix and other forms.
6. Laying of anti-static f
In building electromechanical engineering, seismic supports and hangers have begun to be used compulsorily, but many engineering friends are still relatively unfamiliar with this, because the design of buildings has basically not considered electromechanical seismic resistance, and seismic supports and hangers have never been used. But the situation is different now. The building electromechanical industry has a national standard in the field of seismic resistance, which clearly stipulates the setting and design of seismic support.
The following is a sort of anti-seismic support and hanger
· What is the basis for setting up seismic supports and hangers?
· What is seismic support and hanger?
· What are the common forms of seismic supports and hangers?
· Where are earthquake-resistant supports and hangers needed?
What is the basis for setting up seismic supports and hangers?
According to the national standard GB50981-2014 "Code for Seismic Design of Building Electrical and Mechanical Engineering" issued by the Ministry of Housing and Urban-Rural Development in 2015, it clearly stipulates the design and use of seismic supports and hangers. The standard has been implemented since August 1, 2015, which also means that since then, seismic supports and hangers must be considered for construction mechanical and electrical engineering.
What is seismic support and hanger?
Seismic support and hanger is a support and hanger product used to support water pipes, air pipes, bridges and other electromechanical pipeline equipment and provide seismic support. According to GB50981-2014 "Code for Seismic Design of Building Mechanical and Electrical Engineering", the definition of seismic support and hanger is: the seismic support facility that is firmly connected to the building structure and takes seismic force as the main load. It is composed of anchors, reinforced booms, seismic connection members and seismic braces.
What are the common forms of seismic supports and hangers?
According to GB50981-2014 "Code for Seismic Design of Building Electrical and Mechanical Engineering", seismic supports and hangers are composed of anchors, reinforced booms, seismic connection members and seismic braces. All components that make up the seismic support and hanger should be finished components, and the structure of the connecting fasteners should be easy to install.
Lateral seismic hanger
is used to resist the lateral horizontal seismic force.
Longitudinal seismic hanger
is used to resist the vertical horizontal seismic force.
Single pipe (rod) seismic support and hanger
is an earthquake-resistant support and hanger composed of a load-bearing hanger and an earthquake-resistant diagonal brace.
Door type seismic support and hanger
An earthquake-resistant support and hanger consisting of two or more load-bearing hangers, beams, and seismic braces.
Where do you need to use seismic supports and hangers?
According to GB50981-2014 "Code for Seismic Design of Building Mechanical and Electrical Engineering":
Article 1.0.4 (Strong Article) stipulates that the electrical and mechanical engineering of buildings in areas where the seismic design intensity is 6 degrees and above must be subjected to seismic design.
Article 3.1.6 stipulates the content of seismic fortification:
① Equipment with gravity greater than 1.8kN in the suspended pipeline;
② Domestic water supply and fire-fighting piping system above DN65;
③A duct system with a rectangular cross-sectional area greater than or equal to 0.38㎡ and a circular diameter greater than or equal to 0.7m;
④For electrical piping with an inner diameter greater than or equal to 60mm, and cable ladder frames, cable trough boxes, and busbars with a gravity greater than or equal to 150N/m.
Article 3.1.8 stipulates that the pipes of the building electrical and mechanical engineering process passing through the seismic isolation layer shall be connected by flexible connection or other methods, and seismic supports shall be set on both sides of the seismic isolation layer.
Article 22.214.171.124 stipulates that when the straight line length of the water supply and drainage risers of high-rise buildings in the 8 degree and 9 degree areas is greater than 50m, anti-vibration measures should be taken; when the straight line length is greater than 100m, anti-vibration measures should be taken.
The indoor water supply, hot water and fire-fighting pipes whose diameter is greater than or equal to DN65 that need to be fortified in Article 126.96.36.199 shall be provided with seismic supports as required when they are fixed by hangers, brackets or brackets.
Article 188.8.131.52 stipulates that the pipes in the boiler room, refrigerating machine room, and heat exchange station should have reliable lateral and longitudinal seismic supports. If multiple pipes share a support or hanger or a single pipe support and han
As we all know, the role of traditional supports and hangers in the electromechanical system is load-bearing. The principle is the common sense that gravity acts downward. How does the seismic support and hanger play an anti-seismic role?
Through GB 50981-2014 "Code for Electrical and Mechanical Seismic Design of Buildings", we can know that seismic supports and hangers mainly guarantee the safety of support and hanger systems through the function of resisting horizontal seismic forces.
How to understand "resistance to horizontal seismic force"?
1. How does the earthquake work and how does the vibration cause damage to the building?
First, we need to know what an earthquake is. According to the explanation of Baidu Encyclopedia, we can know that earthquakes are vibrations caused by the release of energy in the earth's crust, which affect or even destroy human life through seismic waves.
So what are seismic waves? According to the current level of earthquake research in the world, seismic waves can be divided into three forms: longitudinal waves (P waves), transverse waves (S waves), and surface waves (L waves). Longitudinal waves are propulsion waves, which cause the ground to vibrate up and down, and are relatively weakly destructive. Transverse waves are shear waves, which cause the ground to shake back and forth, which is more destructive. Surface waves are the most destructive mixed waves generated by the excitation of longitudinal waves and transverse waves when they meet on the surface.
In the field of electromechanical seismic resistance, it is widely understood as: the gravity support and hanger play the role of resisting and alleviating the vertical seismic force (ie longitudinal wave). The seismic support and hanger, through its unique diagonal brace structure, greatly resist and relieve the horizontal seismic force (ie, transverse wave).
2. The action mode of the seismic support and hanger, how does the seismic brace resist the horizontal seismic force
As we all know, seismic supports and hangers are reinforced by seismic diagonal braces to resist earthquakes.
It is precisely because of the existence of the seismic brace that the pipeline support and hanger system, which is originally unfettered in the horizontal direction, can be safe and reliable in the event of an earthquake, preventing the pipeline support and hanger system from collapsing and falling, causing serious secondary occurrence disaster.
From a simple mechanics point of view, we can do a simple disassembly analysis of anti-seismic brace.
From the figure above, we can clearly see that the seismic brace has an oblique upward pulling force on the overall support. According to the force decomposition principle, this diagonal pulling force can be decomposed into a horizontal force Fx and a vertical force Fy , The horizontal force is the load effect value of horizontal earthquake, and the vertical force is the load effect value of gravity.
When is applied in practice, the anti-seismic brace has the function of "anti-seismic", also according to the above principle. If there is no seismic brace, the pipeline support and hanger system is not bound in the horizontal direction. Once an earthquake occurs, it is conceivable that the overall support and hanger system will produce disorderly and irregular shaking, gradually taking root or connecting nodes of the structure Fracture and fall off occurred, causing irreparable losses.
3. Whether the anti-seismic effect of diagonal brace is related to the bearing gravity, and whether there is gravity on the diagonal brace
From the second point, we can know that the seismic brace has a certain gravity load effect in mechanics. Of course, the greater the gravity carried by the pipeline support system, the greater the value of the gravity effect on the seismic brace, so the seismic effect of the diagonal brace does have a certain relationship with the bearing gravity.
However, one thing we need to pay attention to is that the functionality of seismic supports and hangers is mainly "seismic resistance" rather than "load bearing". The prerequisite for the installation of seismic supports and hangers is that the gravity supports and hangers must meet the conditions and can meet the gravity action of all the pipelines and media in the vertical direction. That is, the gravity effect on the seismic supports and hangers can also meet the functional requirements. In layman's terms, it can be summarized as: there is gravity on the seismic brace, but we do not consider the gravity effect of the seismic support and hanger when we design and calculate it, that is, the gravity co-support is not considered. (Except for special cases, there may be gravitational co-existence in some narrow spaces.)
4. Functional analysis of seismic connectors
Seismic connectors generally have the following forms
From the above, we can know that the seismic connecti