A program of introduction of new communications base station

Paper Keywords: high-speed railway communication base station sharing six communication towers environment protection and energy security
Abstract: The Tower and the room included a new communications base stations, including programs to meet the vigorous development of China's current high-speed railway communications signal transmission requirements, while addressing the mobile operators to achieve the same base station to build, share technical problems to help the Ministry of Industry and Information Sharing of telecom infrastructure, the implementation of the policy. The base stations also has a beautiful appearance, security, small footprint, environmental protection and energy saving.

With the cause of the rapid development of high-speed railway, the railway construction along the inevitably large number of communications towers. Communications tower from the functions can be divided into two categories: Category 1 to satisfy the operation of the railway system for train control and scheduling requirements of the construction Railway communications tower; Category 2 as an ordinary mobile communication towers, such as Mobile, China Unicom and China Telecom and other mobile communications companies building their own mobile communications tower.

September 2008, the State Department and the Ministry of Industry and Information Technology issued a <"On the telecommunications infrastructure to promote sharing of emergency notification>>. Notice that the build, share, can effectively reduce the network construction works on the land, power resources consumption, while protecting the resources and the natural landscape, saving money, Base Station Location solve the difficult problem, to a certain extent, saving and emission reduction. If we can these two kinds of communications towers along the railway line shared a total of built, not only to facilitate unified management, but also in advance unified planning and design standards to minimize the communication tower design and construction of manufacturing quality standards due to differences in the risk of accidents down the tower to avoid the resulting high-speed railway safety the impact of running.

Although the build, share, have been proposed for some time, but implementation is still in its infancy, the current common share and build on the existing approach is only based on the increase in tower and antenna support platform. Since the traditional mobile communication tower at the design stage did not consider to build, share needs, safety, economy, fitness and aesthetic and other aspects are difficult to satisfy all parties. Therefore, to build specific, shared principles and requirements, development of new communications base station design is the subject of very practical significance, but also the Ministry of Industry to build and share the spirit of thoroughly implementing the technical support.

This paper presents a new type of hexagonal communication tower and equipment room layout program, not only for the three mobile operators to build between the base station, also applies to railway communication towers and mobile communication towers to build, share , especially for high-speed railway layout.

1 Design Principles
1. In accordance with the high-speed railway communication tower safety level requirements designed to meet the natural wind load, ice load requirements while wrapped in full consideration of high-speed trains passing by when the additional pressure on the tower produces effects.

2. Because of the need to bear to build and share all the antenna equipment weight and production of the horizontal wind load, the structure need to adopt the form of a stronger capacity to meet the strength requirements and the use of Technology requirements.

3. Antenna, easy installation, provided for the use of the full antenna installation location options.

4. Multi-device focused on the same base stations, base station requires high security, which can effectively prevent the theft and destruction.

5. Through rational design, to reduce the footprint, saving material consumption, environmental protection and energy saving effect.

2 program introduced
New communication base stations including the tower, mast, engine room, protective cover and base 5 shown in Figure 1. The rational part of the ingenious design and with each other, with the traditional base station is very different in design, with many traditional base stations do not have the advantage.

Wide from the edge of the tower the same number of hexagonal tower sections of tower steel pipe disposes column section, the combination of angles for the vice rod structure, the tower through the flange connection between paragraphs. The bottom of the tower section of staff in order to facilitate progress people inside the tower, using "K" type oblique rod arrangement; the middle of the tower segment is easy to manufacture and install, are used cross-diagonals; top of the tower due to the smaller segment, may be appropriate to reduce the number of layers diagonals. tower side width should be considered the force and antenna tower spacing is determined. tower can be installed according to demand a number of circular platform.

Derrick tower is located in center, if the same width in a side segment is composed of triangular shape. The whole segment with round steel welded structure, the segment through the flange connection between, and through the diaphragm components and tower connection. derrick at the top of lightning rod installation, and use its strength out of the tower to a certain height, thus increasing the effective height of the tower and the lightning protection range. derrick width and vice rod arrangement to climb the tower and the feeder according to the installation requirements and design, it doubles as a ladder and feeder channels.

Room is, the external form of the closed ring structure, similar to the middle to form a patio space. Tower and derrick is mounted vertically in the space. Room wall can be divided into several regions, for different enterprises. Room security door exterior design, interior design security door and feeder window. room roof with center high and low around the structure, conducive to the roof bulk water, while the bottom of the engine room also has a drain to prevent accumulation of water inside the courtyard.

To prevent non-staff members from the top into the room, set in the guard towers around here. Use of the tower's supporting role, can ensure adequate shield height and strength. So the Eiffel Tower, the outdoor feeder and air conditioning and other equipment are is protected in a closed space, so as to effectively prevent the theft, vandalism and non-staff privately climbing phenomenon.

Tower, derrick, and the entire board room share the same foundation, the foundation in the engine room, external beam under the ring to strengthen the tower and the exterior stigmas radial strengthening structural columns located between the beams, so that the basis of the entire board has sufficient rigidity . the one hand, to avoid the occurrence of differential settlement of the various parts of the other hand, the weight room can become a favorable basis for overturning load. In addition, the derrick floor to the stigma surrounding the hollow structure, while saving the amount of concrete and easier to derrick and the basis of the grounding connections.


3 Performance Analysis
3.1 Security
Capacity in terms of structure, using steel composite structure is hexagonal, with the traditional angle steel tower, four towers, three towers and compared with single-tube tower, bending moment of inertia, resistance to both a substantial increase in torsional stiffness, significantly enhance the overall carrying capacity, more resistant to wind loads and high speed trains to bring additional pressure. structure of the overall margin of safety enhancements, and increased the rigidity of the structure in the dynamic random wind load effects of lower structural elements the possibility of fatigue failure decreases. reposted elsewhere in the Research Papers Download http://www.hi138.com communications tower in the traditional design, the ladder, under the wire feeder support and ancillary facilities such as lightning are hung on the tower shelves, is the additional tower loading, and these asymmetric loads on the tower are adversely affected by the force. The new programs from loading by setting the center of the derrick, you can transfer these loads from the tower body to the mast up, and center Derrick can also be connected to the diaphragm and its components play a role in vertical support. These measures will further enhance the safety of the tower.

Tower in the engine room and the tower constitutes a barrier fence protection and therefore avoid the result of theft, vandalism and other factors have led to damaged or missing structural members resulting from insecurity. Also, because foreign workers can not enter the room and the enclosed patio room, communication base station equipment, including air-conditioning outdoor unit, feeder and ancillary equipment have been a number of effective protection to ensure smooth communication base stations, safety.

3.2 Applicability
Tower is hexagonal cross section and the plane distribution of the same communication antennas, tower full account of the distance between the antenna horizontal spacing requirements, and each root towers are perpendicular to the ground, so any height in the tower can be directly fixed to the tower on the antenna, the antenna is very easy to install.

When the relative concentration of the same height when the parties to the antenna can be an additional layer of circular platform, so to have the tower at the same altitude, platform and platform support of extended triple antenna antenna installation location, installation of more antennas to meet the demand.

Because Tower has a better capacity and stability, but also the installation of microwave antennas to meet the needs of the base station in the event of earthquakes and other destructive underground cable fault caused the disaster situation, emergency communications can be carried out by microwave.

Will inevitably cause the increase in the number of antenna feeder increase in the number, the traditional tower ladders along the cross arm on both sides of the feeder, the pick length and carrying capacity constraints, the limited number of feeder is installed. The design of self-supporting mast, carrying capacity and feeder feeder installation location is much larger than the traditional cross arm, internal staff can also climb the tower mast, the more traditional straight ladders more secure.

3.3 Economy
As a result of the whole side of the tower uniform width, without changing the shape of slope, the steel consumption in theory, broken line than the parabolic or slightly higher than the tower, but if considering the platform, the antenna support and other ancillary components of the steel volume, the total use but slightly lower than the amount of conventional steel tower.

All the same width top and bottom of the tower, tower segments the same length, angle and length of diagonals are the same, this design is very convenient preparation manufacturing enterprises, manufacturing, transportation and installation. But also to facilitate standardization and serialization of tower design.

Tower and the room share the same foundation, and based on weight room offers a favorable overturning help, can save a lot of content and covers an area of ​​concrete. For example, circular room inside diameter 4m, depth 4 m, the external diameter of 12 m, ie 12 mx 12 m in the area, the use of available space near 100m.

Circular room with separate rooms, compared with the improved thermal insulation. Room can be sealed protective cover on the shading material, and appropriate increase in height, with the external walls of the engine room vents opened, enabling the engine room heat up the chimney effect of natural air , which saves air conditioning energy consumption.

3.4 Appearance
Aesthetics are more subjective, can be described as benevolent see benevolence and the wise see wisdom, it is difficult to quantify the comparison, the following new program only to analyze the visual characteristics described.

1. Tower design aspect is relatively large, vertical towers, so sleek, tall and straight.

2. Tower shape is hexagonal, triangular and quadrilateral iron than the Tata side more, and all the angles and diagonals are the same length, so that tower structure is much more regulated, there is a strong sense of rhythm.

3. Antenna towers installed along as far as possible, feeder focus on the center mast, to minimize the installation of cable and antenna to the tower to bring the messy feeling.

4. Room and the tower as an organic whole, can take advantage of the engine room of the building form, to reach the traditional base stations can not achieve the aesthetic effect. Such as the engine room area and protection their representative network architecture design, the tower is also matching can adapt it. passengers through the base station of the shape and style to know where the region.

4 Conclusion
New base station through the analysis of conceptual design solutions to solve the build, share technical issues, and provides many of the traditional communications towers do not have advantages, such as security, conservation of land, environmental protection and energy saving. In addition, its architectural Aesthetics, there is still a great potential for mining. Links http://www.hi138.com Research Papers Download