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  How to calculate the cable in the mountain air blowing lengt>>您当前位置:主页 > Industry-News >

How to calculate the cable in the mountain air blowing lengt

作者:admin 时间:2014-05-28 22:02

1 mountain air blowing peace gas blowing what is the difference?

(1) the name of blowing distance LN means: according to the cable and pipeline laying characteristic and standard,using ordinary / super air blower can reach the level of routing in the air blowing distance.

2 pre work plan (AJP):

AJP means:

2.1 the exact fiber optic disc location;

2.2 identify local air compressor can not enter, such as: (measured from the vehicle can pass road) is less than 100 meters distance, specifically by the high-pressure gas pipe length;

2.3 validation profile, pipeline route such as: up and down point of view, up and down between the distance of the.

The related data from 1 to more than 3 points can be obtained from the route survey.

If in the air before the start of the contractors do not know these data, should be sent along the cable route to build a plane graph, display:

Between the slope change point distance (Lxx)

The slope change point of view (Hx)

With wheel position the cable (S)

The air compressor can enter the area (- Axy -)

The air compressor can not enter the area (- Dxy -)

Figure 1: example pipeline section

The red solid line indicate: air compressor can enter the area

The blue dashed line: air compressor can not enter the area

3 how to calculate the maximum gas in the slope under the influence of blowing distance:

The assumption of line:

Figure 2: pipeline route diagram

Requirements in points (1) and (5) between the laying. Measure the distance between point and point:

L1-2: 500 m

L2-3: 255 M

L3-4: 502 M

L4-5: 200 m

L1-5 length: 1457 M

In point 2 and 3, with an upward slope, which makes the 2 road route between the horizontal tube is much harder topoint 1 and point in the process of this distance of cable. Look on the slope of the one meter distance than thehorizontal one meter distance is long, it is how long? In order to determine the distance to measure the height of H3,must use the height. After knowing L2-3 distance and the height of the H3, and it can be used to calculate the distance between point 2-3. According to figure 2 suggests, it is easy to get the slope factor.

Equal horizontal distance (EHD) effective distance is equal to the slope factor from point 2 to point 3 divided by the measured. In the figure above, ramp rate is:

50 255 0.196

From the slope coefficient in Table 1, can find out the ramp rate corresponds to the slope factor Sf is 0.400,therefore, the horizontal distance is equal to:

L2-3 / Sf = 255 / 0.4 = 637 M

Figure 1: the slope factor Sf (up)

In fact, when the cable from point 3 to point 4, down 1 meters because of many factors than the pipeline plane road1 meters short. Must ignore the downward slope, so the distance corresponding must treat as in the plane.

In this case, from point 1 to point 5 air blowing distance L1-5, with equal horizontal distance (EHD) expressed as follows:

L1-2: 500 m

L2-3: 255/0.400 = 637 M

L3-4: 502 M

L4-5: 200 m

L1-5 length: 1839 M

This distance has obviously not we measure time of 1457 meters.

So if we can be one or two days in advance to do a comprehensive survey on the pipeline route is very important,the construction side according to the route of the terrain to determine whether we need the middle to both ends of blowing or direct point-to-point blowing.

In any case, intermediate gas blowing or point of the gas blowing in the same horizontal distance under gas blowinglength may not exceed the nominal air blowing distance LN.

Figure 2: the slope factor Sf (down)

The compiler's ending:

A scientific method for fiber optic cable, micro cable or optical fiber bundle (FU) of the air blowing installation, can rise to twice the result with half the effort. For cable name blowing distance LN, we generally use the simulation or bycable blowing performance test to get. The laying of pipes when in addition to its own internal wave, bending without external factors caused by. This pipe is the ideal. In actual construction, the manual excavation trench, there are many factors if not controlled, laying quality can result in pipeline is very poor. So often mountain blowing effect thanplain blowing effect. This is because there is no water in mountain trench, ditch bottom is relatively hard and pipeand backfill quality easy to check, the construction units and construction units on the mountain of pipe caused by the higher quality requirements. If the pipe quality can meet the design requirements, the calculation method cangreatly improve the construction efficiency. In the process of air blowing cable, many effective time is consumed at the site transfer and barriers to treatment. If we can spend a little more time in the pipeline laying, spend a little timein the pipeline through inspection and line understanding, air blowing cable will no longer be a blind gas blowingprocess.




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