Weifang Odea Machinery Co., Ltd.
Address: Weifang Economic zone,Weifang city,Shandong Province ,china
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Vertical vibrating mold making power cable tunnel and the top tube of the type Highlights
As China's urbanization continued rapid development, urban underground infrastructure advanced, efficient and reasonable increasingly important. Improve the urban underground facilities to protect the environment, conserve resources and beautify an important part of their homes. CPC Central Committee and the State Council attach great importance to this work, since 2013 has issued a document to give local support from the policy level, major efforts to finance capital.
The construction of urban underground pipeline from the pilot to the gallery building work was the focus of the next few years working underground urban infrastructure construction projects. In fact, one of the city's comprehensive pipe gallery content accommodated - underground high voltage cable tunnel earlier years had been the first to implement in many cities, many experts also referred to as high-pressure underground corridor.
It is understood that China has built underground power cable tunnel, cross-sectional shape, size and cross-sectional area of each cable installation methods used by each city are different.
Cross-section of power tunnel of roughly circular, box-shaped, shaped (oval, semi-circular) cross-sectional shape, etc., within the space height were more than 1.8m, Shanghai, Wuhan, Guangdong, Henan and other places chosen circular tunnel diameter of 3.5m.
Looking at the power cable tunnel has been completed, the vast majority are optional circular cross section, the tube section substantially similar to the shape of its tunnels Steel Socket Flexible Interface jacking construction method with reinforced concrete pipe, tube design also refer to "Jacking method using reinforced concrete pipes "national standards. But the strength, structure and other technical indicators are more than the standard requirements of reinforced concrete drainage pipe. In order to improve the impermeability, leakage performance, power cable pipe also adds a number of safety measures such as: bearings, mounted socket interface section with double sealing apron, steel and concrete socket joint configuration sealing ring and Peng Zhang water tape. In addition, the pipeline to meet the needs cable installation, embedded, prefabricated devices and connectors special needs.
Power cable tunnel with reinforced concrete pipe material is the key to the tunnel project, with the construction of jacking pipe joints are prefabricated in the factory, and then transported to the site jacking installation.
These tubes are currently manufactured at the factory, the vast majority of the use of vertical vibration steel pouring concrete, high-frequency vibration compaction molding production process, pipe production is a crucial link in the exact configuration of the tube late-assembled cables with pre-special requirements buried, prefabricated with spare parts.
Installation of underground cables within the power cable tunnel, there are many different installation methods require embedded in the inner tube section embedded parts and accessories form the shape is different, with more, and more typical of the following three forms.
The first form: embedded steel pipe inner ring.
In the top section of the inner tube pipe embedded steel ring, two rings embedded within each pipe section, first in steel ring bearing bracket when welding cable tray cable installation, bearing brackets placed above the cable tray installation. This method is currently the most used method.
In the figure on the left there is embedded tube FIG sheet ring, the right is a cross-sectional view of a cable tube mounted on a bracket bearing bracket:
When the tube production, two ring steel ring positioning is the key when loading mode:
◆ First, to ensure the production of steel ring size is accurate, consistent ring inner diameter of the pipe inner diameter.
◆ When pretended to ensure accurate sheet ring is installed, there are two relatively easy method of operation:
First, the use of additional reinforcement assisted positioning, when the lower ring mounted in the outer ring on the number of pre-weld root longitudinal reinforcement, steel rims length prevail in the end tray plane, the collar into the inner mold, reinforcement end supported on the chassis and then set into the upper ring, the lower ring upper ring can rely on the basis of measurements in welding auxiliary positioning ribs can also be welded on the secondary ribs curved legs hanging up the inner mold, then the mold in place, installed steel cage, two steel ring reinforcement cage welding firm, then the normal process pipe can be.
Second, the positioning pin positioned in the mold of the drilling steel, mounted on the pin, relying on the positioning pin holder bearing sheet ring until after the steel ring and steel cage welded firmly positioning pin back into the inner mold smooth outer office, then the normal process pipe, so the operation is simple compared with the previous program, ensures the sheet ring and the inner wall has good flatness.
The second form: embedded annular end surface of the perforated plate.
This installation of the cable in the power cable tunnel method is by the Hubei Electric Power Survey and Design Institute in 2007, the project's first cable laying project to determine the snake, which is the key section of the pipe socket end face of the cable tunnel embedded circumferential band steel plates hole, when installing cables in the underground tunnel, with a special metal fixture mounted on steel ring, and then the cable clamping, this method is very easy to install cable, quicker and more effective use of the tunnel space.
The figure is a sectional view of the perforated steel plates embedded in the tunnel section diagram and cable installation.
End surface of the socket is too much trouble to ring embedded perforated steel ring tunnel tube production, because the inner diameter of the steel ring is smaller than the inner diameter of the tube, forming the only method to select only vertical vibration molding steel, even with vertical molding method but still presence pretended difficult problem, because the cement pipe vertical molding mold must have inner and outer mold, while smaller than the inner diameter of the inner diameter of the steel ring, steel ring hindered the internal model is installed, the key to solve this problem is:
◆ make sure that the proposed steel ring embedded with a higher accuracy, especially concentricity.
◆ transformation bottom tray, the upper chassis plane narrow garden, and machining a boss, the boss and the outer diameter of the inner diameter of the annular ring is consistent when the boss pipe on the chassis ensure placed on top of the steel ring concentric with the mold.
◆ More important is the need to solve the problem within the mold positioning, according to the conventional tubes are designed with an interface to the socket end of the inner ring has a figure above numbers, the front end of the first ring and the pipe socket welding firm prefabricated steel ring 3, end the use of positioning ring becomes inner mold ring installed in the mold, followed by a conventional tube-making step operation can be.
The third form: the inner tube embedded positioning rail nut.
This installation method is called cable pipes embedded rail nuts method of installing cables in the tunnel.