Introduction to communication construction of Beijing-Shijiazhuang Expressway?

Due to the early construction of Beijing-Shijiazhuang Expressway. Supporting facilities have not kept up. The communication channel has not been built yet. This has seriously hindered the development of expressway management modernization. Communication system is the foundation of expressway management modernization. At the same time, it is also a very important resource for the modern communication system of the whole society. Therefore, the construction of communication pipeline of Beijing-Shijiazhuang Expressway is very necessary. Zhong Da Consulting obtained the following information about the communication construction of Beijing-Shijiazhuang Expressway through data integration.

Comparison of communication pipeline routing and site selection schemes of 1 Beijing-Shijiazhuang Expressway

Pipeline routing and location selection should follow the following principles: saving investment and facilitating construction and maintenance. There are three schemes for the routing and location selection of communication pipelines in Beijing-Shijiazhuang Expressway.

Scheme 1: communication pipeline is buried in the central separation zone. The communication pipeline is located in the central isolation zone. Not affected by road expansion and reconstruction and other departments' engineering construction. The cable is safe and easy to maintain. But the central isolation belt of Jingshi Road has been afforested for many years. If a communication pipe is set in the central divider. All the green belts with an investment of nearly 100 million yuan will be destroyed. The loss is huge. Exceeded the total investment of this project. In addition, due to the large traffic volume of Beijing-Shijiazhuang Expressway. The speed is very high, reaching 120km/h or even higher. Therefore, the construction in the central separation zone is also very dangerous. It is difficult to guarantee the life safety of a large number of construction workers. For the above reasons, this scheme is not desirable.

Scheme 2: The communication pipeline is buried along the highway slope or berm. The communication pipeline is located on the slope or berm of expressway, which will save the cost of cleaning and re-greening the green belt. At the same time, due to the smooth alignment of the expressway. Therefore, it is also beneficial to the wiring of communication pipes. However, this scheme has the following disadvantages:

1) Because the expressway subgrade has been compacted. It is difficult to dig;

2) The construction surface of slope or berm is too small. Its width is less than1m. So the construction is difficult. And there is no place to pile up building materials and equipment such as soil;

3) Excavation of pipe trench on slope or berm will adversely affect the stability of expressway subgrade. Poor treatment will cause large-scale landslide of subgrade. Causing serious damage to the expressway;

4) There is an spillway every 25m on the expressway slope, and the destruction and restoration of these spillways will increase a lot of workload;

5) When the pipeline crosses roads such as passages, it needs to pass through bridges or pipe jacking. This also requires a lot of money;

6) The traffic flow of Beijing-Shijiazhuang Expressway increased. It is now close to its capacity. The communication pipeline located on the slope protection road or slope will affect the reconstruction and expansion of expressway.

For the above reasons. The plan was also rejected.

Scheme 3: Bury the communication pipeline along the outside of the side ditch of the expressway. The communication pipeline located outside the side ditch has the following advantages:

1) Save the cost of green belt cleaning and greening;

2) The soil quality of the construction site is natural soil, so the construction difficulty is small;

3) The construction site is far away from the expressway subgrade, which will not adversely affect the stability of the expressway subgrade;

4) Save the damage and maintenance cost of the drainage trough;

5) Not affected by expressway reconstruction and expansion.

The disadvantages of this scheme are as follows:

1) There are many obstacles in the construction site, which need to be avoided and the route is not smooth;

2) Some trees need to be destroyed;

3) As in the second scheme, pipelines crossing passages and other roads need special treatment, which will also require a lot of money.

As far as saving investment is concerned, Scheme 3 is the best. And it will not bring adverse effects to the safety of the expressway, so it is the best scheme.

2 Selection of communication pipeline materials

At present, there are several kinds of communication pipes: cement pipe precast block, PVC flat-wall plastic pipe, high-density polyethylene (HDPE) double-wall corrugated pipe and silicon core pipe. Precast cement pipe blocks have been gradually eliminated due to poor performance. The price of PVC flat-wall plastic pipe is lower. However, due to its low strength and brittleness at low temperature, its service life is about 10 year, which is shorter than that of optical cable and gradually replaced by HDPE. HDPE double-wall corrugated pipe overcomes the shortcomings of PVC flat-wall plastic pipe. It has been widely used. Silicon core pipe is a pipe with silica gel coated on the inner wall of HDPE pipe as lubricant. You can use air blowing when you wear the optical cable, which will save a lot of manual drilling. Although the silicon core pipe is blown when laying optical cables, theoretically, it can continuously thread 2000-6000m at a time. Save the cost of inspection. However, the double-wall corrugated pipe has been applied in Beijing-Shijiazhuang Expressway for the following reasons:

1) silicon core tube is expensive. Bellows 9 yuan/meter, each tube can be placed with three root canals. The 6 yuan/meter of silicon core pipe is about, and its cross-sectional area is only equivalent to one pipe in corrugated pipe. The investment of three silicon core pipes is 18 yuan/m. Due to the large demand for pipes in the pipeline project of Beijing-Shijiazhuang Expressway. The investment of 9-hole 220km corrugated pipe is about180,000 yuan, and the initial investment is increased to 36 million yuan by using silicon core pipe. The increase of initial investment cost will definitely limit the possibility of potential renters renting pipe hole resources. Increase investment risk and waste of pipeline resources.

2) There are many structures such as bridges and culverts along the expressway. Such as passages, bridges, culverts, etc. There are 1 passages, bridges and culverts every 700 meters along the Beijing-Shijiazhuang Expressway. Each structure should have at least two transitional handholes on both sides; In addition, the branch pipelines of traffic monitoring facilities along the line and the branch pipelines of local telecom operators need to set a large number of bifurcated handholes on the main pipeline, which can not give full play to the economic advantages of silicon core pipe materials such as saving handholes along the line and fast construction.

3) The threading of silicon core pipe requires high quality of construction equipment, construction technology and construction personnel. It is very difficult to add branch pipes and repair damaged pipes, which is not convenient for pipeline maintenance.

Based on the above reasons, according to the characteristics of expressway and the needs of its communication system, HDPE double-wall corrugated pipe is used for the communication pipe of Beijing-Shijiazhuang Expressway.

Generally speaking, expressway communication pipelines should be planned and implemented synchronously with civil engineering according to the overall planning of expressway electromechanical system construction. However, for the expressway whose communication pipeline construction is later than the civil engineering, it is necessary to compare and select the construction schemes from various aspects in order to achieve better results.

The above is the introduction of Zhong Da Consulting on the communication construction of Beijing-Shijiazhuang Expressway. For more information about expressways, please pay attention to the architectural knowledge column of Zhong Da Consulting.

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