KR101059415B1 - How to collect underground cables - Google Patents

Abstract

Disclosed is a method for collecting underground cables for recycling reusable underground cables.

In the underground cable collection method according to the present invention, the plurality of cables are formed by using a waterproof cap having a plurality of first holes and at least one second hole corresponding to the number of cables embedded in the underground pipeline. Capping one end of the underground pipe line while being inserted into each one hole, and spraying the cleaning solution into the underground pipe line through the second hole of the waterproof cap to remove foreign substances on the plurality of cables; Disposing a ladder-type support for supporting the plurality of cables in a manhole connected with the underground pipeline; Putting a pulling grip on the plurality of cables, and using the pulling grip to pull out the manhole while supporting the plurality of cables with the ladder support; And removing the pulling grips and winding each of the plurality of cables drawn out of the manhole by using a cable pulling device spaced a predetermined distance from the manhole.

Description

How to collect underground cables {METHOD OF COLLECTING UNDERGROUND POWER CABLE}

The present invention relates to a method for collecting cables buried underground, more specifically, when relocating the pipeline, can be collected in a clean state, so that renewable cables buried in the ground can be recycled again, the cables are twisted together The present invention relates to a method for collecting underground cables that can prevent cable breakage caused by such conditions.

Recently, power facilities are gradually getting underground due to lack of aesthetics and the inability to install overhead lines.

Current underground distribution works can be divided into three types: direct sales, pipeline, and electricity.

Direct underground underground construction is a method of embedding power cables directly in the ground, and pipeline underground distribution construction is a method of constructing underground pipelines using pipe materials and then introducing cables. The upper part for the same place has a closed shape.

However, the direct direct underground construction is limited in the number of cable lines, is inconvenient for maintenance checks, and is currently rarely used due to difficulties in expansion and demolition.

The old-fashioned underground line construction method has the advantages of easy cable laying on multiple lines, convenient maintenance and inspection, and low risk of trauma accidents. However, in spite of the above advantages, this method is applied only in certain cases due to the high cost of construction and the long time required for construction.

Currently, the most common construction method among underground underground facilities is pipeline. Pipeline underground lines are most frequently used because they are easy to expand and dismantle, easy to check and repair through manholes, and less risk of traumatic accidents.

Such pipeline type underground railway works are constructed by embedding pipelines (underground pipelines) in the ground at a predetermined distance, and installing and connecting cables after installing manholes at both ends of the underground pipelines.

On the other hand, the cable buried in the ground through the construction of the pipeline underground line is exposed to the foreign material such as the soil and stone continuously. If it is necessary to relocate the pipe for a specific reason, the cable buried in the ground must be collected. If the cable is collected directly, the cable may be peeled off due to scratches on foreign materials. In this case, the electrical characteristics of the cable may be gradually deteriorated, and may affect other electrical devices connected through the cable, and thus may be difficult to reuse.

Therefore, when collecting the cable according to the relocation of the pipeline, there is a need for a method of collecting the underground buried cable that does not cause a clean surface and break so that the reusable cable can be recycled back to a clean state.

An object of the present invention is to collect underground buried cables that can be reused for reasons such as pipe relocation, can be collected in a clean state, underground cable collection to prevent the cable breakage caused by the twisted cables, etc. To provide a way.

The method of collecting underground cables according to a preferred embodiment of the present invention for solving the above problems includes a cable washing step, a ladder-shaped support arrangement step, cable withdrawal step, tension relief step and winding by cable.

In the cable washing step, the plurality of cables may be connected to the first portion of the waterproof cap by using a waterproof cap having a plurality of first holes and at least one second hole corresponding to the number of cables embedded in the underground pipeline. Capping one end of the underground pipeline while being inserted into each hole, and sprays the cleaning liquid into the underground pipeline through the second hole of the waterproof cap to remove foreign substances on each of the cables.

In the ladder support arrangement step, a ladder support for supporting the plurality of cables is disposed in the manhole connected to the underground pipeline. In this case, the ladder support includes an upper roller and a lower roller, the plurality of cables may be drawn while contacting the lower portion of the lower roller and the upper portion of the upper roller.

In the cable withdrawal step, a pulling grip is applied to the plurality of cables and the plurality of cables are pulled out to the outside of the manhole while supporting the plurality of cables with the ladder support.

In the tension releasing step, a plurality of tension distributing means in the form of a roller for distributing tension of each of the plurality of cables is further disposed between the manhole and the cable pulling device, thereby eliminating the tension applied to the plurality of cables. At this time, the plurality of tension dispersing means may be formed of a roller having a left and right asymmetrical shape.

In the winding step for each cable, the pulling grip is removed, and a plurality of cables drawn out of the manhole are wound on a plurality of reels, respectively, by using a cable pulling device spaced a certain distance from the manhole. In this case, the cable pulling device is preferably spaced 20 ~ 50m from the manhole.

Underground cable collection method according to the present invention has the advantage that can be collected in a clean state by washing the cable before the cable collection through the waterproof cap and the cleaning liquid.

In addition, the present invention can prevent the damage of the outer shell of the cable through the ladder support, it is possible to prevent the cable is broken by dispersing the tension applied to the cable when the cable is pulled through the tension distribution means.

In addition, the present invention is because the cable pooling device is located 20 ~ 50m apart from the manhole, when the cable is pulled through the cable pulling device can be prevented from winding or disconnection between the cables can be prevented, the efficient There is an advantage in that cable collection is possible.

Hereinafter, a method of collecting underground cables according to the present invention will be described in detail with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a flow chart schematically showing a method of collecting underground cables according to an embodiment of the present invention. In the method of collecting the underground cable shown in FIG. 1, reference numerals shown in FIGS. 2 to 6 will be referred to.

Referring to Figure 1, the method of collecting underground cable according to an embodiment of the present invention, cable washing step (S110), ladder-shaped support arrangement step (S120), cable withdrawal step (S130) using a pulling grip, tension relief Step S140 and cable-specific winding step (S150).

Cable wash

In the cable washing step (S110), a waterproof cap 30 having a plurality of first holes 31 and at least one second hole 32 corresponding to the number of cables embedded in the underground pipeline 12 is used. Thus, one end of the underground pipeline 12 is capped while inserting the plurality of cables 13 into each of the first holes 31 of the waterproof cap 30. There may be a variety of capping methods, but after forming an appropriate number of screw grooves in the underground pipeline 12, forming a number of holes corresponding to the waterproof cap 30, and then fastening the bolts may be used. Can be.

Thereafter, the cleaning liquid is sprayed into the underground pipeline 12 through the at least one second hole 32 of the waterproof cap 30 to remove foreign substances on each of the plurality of cables 13. The higher the injection pressure of the cleaning liquid, the higher the efficiency of removing foreign substances on the cable. Therefore, the injection pressure is preferably as high as possible.

Therefore, foreign matters such as soil or fallen leaves buried in the plurality of cables 13 embedded in the underground pipeline 12 are washed out through the cleaning solution and the collected cables are kept clean.

On the other hand, the washing liquid sprayed into the underground pipe line 12 through the waterproof cap 30 may include a friction reducing agent. In this case, each of the plurality of cables to be collected keeps the surface slippery by the friction reducing agent while maintaining a clean surface, thereby reducing friction, thereby facilitating the collection of underground cables.

After the cable washing is finished, it is possible to proceed with the cable collection with the waterproof cap 30 as it is, it is more preferable to separate the waterproof cap 30.

Ladder  Support Placement

Ladder support arrangement step (S120) is arranged in the manhole (11) connected to the underground pipeline 12 for placing the ladder support 40 for supporting the plurality of cables.

In this case, the ladder support 40 includes an upper roller 42a and a lower roller 42b, and the plurality of cables 13 are drawn out while contacting the lower portion of the lower roller 42b and the upper portion of the upper roller 42a. Can be.

The plurality of cables 13 may be in contact with both the upper and lower portions of the lower roller 42b. However, since the plurality of cables 13 are in contact with the upper portion of the upper roller 42a, the plurality of cables 13 may also contact the upper portion of the lower roller 42b. When the cable 13 is in contact with the plurality of cables 13 can be separated from the ladder support 40 due to external factors, etc., in order to smoothly adhere the plurality of cables 13 to the ladder support 40. More preferably, the plurality of cables 13 is in contact with the upper portion of the upper roller 42a and the lower portion of the lower roller 42b.

If there is another intermediate roller between the lower roller 42b and the upper roller 42a in the ladder support 40, the plurality of cables 13 abut the upper portion of the upper roller 42a, and It is preferable to make contact with the upper part of the lower and lower roller 42b.

Cable outgoing ( Pooling  Grip)

In the cable withdrawal step (S130), a basket-type pulling grip (pulling grip) 50 is attached to the plurality of cables 13 so as not to slip the cables. After the plurality of cables 13 are tightly wrapped in the pulling grip 50, the plurality of cables 13 are drawn out to the outside of the manhole 11 using the pulling grip 50.

At this time, the plurality of cables 13 are supported by the ladder-shaped support 40 disposed in the manhole 11 in the previous step (S120), so that friction of the side wall of the manhole 11 does not occur, so that the damage during cable extraction Can be prevented.

Release tension of cable

In the step of releasing tension (S140) by placing a plurality of tension dispersing means 60 in the form of a roller for dispersing the tension of each of the plurality of cables 13 between the manhole 11 and the cable pulling device 20 The tension applied to each of the plurality of cables 13 is eliminated.

At this time, the plurality of tension dispersing means 60 may be formed of a roller having a left and right asymmetrical shape.

Although this step (S140) is not essential, since the cable may be broken if the cable tension is not dispersed or resolved, the tension is dispersed in advance when the cable is wound on the reel 22 using the cable pulling device 20. It is preferable to disperse the tension by means 60 to prevent the cable from breaking.

By cable Winding

In the cable winding step (S150), first, the pulling grip 50 surrounding the cable is removed, and a plurality of cables are separated for each cable. Subsequently, a plurality of cables drawn out of the manhole 11 are wound around the plurality of reels 22 for each cable by using the cable pulling device 20 spaced apart from the manhole 11.

The cable pulling device 20 generally includes an electric or manual winch for pulling a plurality of cables and a plurality of reels 22 for winding each of the plurality of cables.

In addition, the cable pulling device 20 may include a speed sensor for detecting the moving speed of the cable. Even though the cable is pulled with a uniform tension in the winch, the speed at which the cable is pulled can be changed by various external factors. Therefore, the winch can be operated by the speed detected by the speed sensor that can detect the cable moving speed. Because there is a need to control. For example, the cable will not move, but if the winch continues to operate, it will exert excessive force on the cable, which may cause the cable to break.

At this time, the cable pulling device 20 is preferably spaced about 20 ~ 50m from the manhole (11). The reason why the cable pulling device 20 is spaced apart from the manhole 11 is to release the plurality of cables if they are twisted together. When the cable pulling device 20 is spaced 20 to 50m away from the manhole 11, a plurality of cables are naturally twisted while the cable pulling device 20 is being pulled toward the cable pulling device 20.

FIG. 2 schematically illustrates devices for implementing the method of collecting underground cables shown in FIG. 1.

Referring to FIG. 2, in order to embed a plurality of cables 13 in the underground by a pipeline underground construction, an underground pipeline 12 is formed, and the underground pipeline 12 is connected to the manhole 11. The number of cables 13 embedded in the underground pipeline is not limited, but three cables are mainly embedded in that three-phase cables are usually used.

When the plurality of cables 13 buried in the manhole 11 are collected, the plurality of cables 13 come into contact with the manhole sidewall and the like to prevent the cable from being damaged by friction, and the plurality of reels of the cable pulling device 20 naturally. (22) In order to be wound around each, a ladder-shaped support 40 for supporting a plurality of cables 13 is disposed.

A plurality of tension dispersing means 60 may be disposed between the cable pulling device 20 and the manhole 11 or the ladder support 40 to distribute the tension of each of the plurality of cables 13.

The cable pulling device 20 includes a winch (not shown) and a plurality of reels 22, and as described above, a speed sensor for detecting a feeding speed of the cable may be further disposed, and the cable pulling device 20 may be disposed. 2 may be disposed in the vehicle as shown in FIG. 2, and may be disposed on the ground.

The cable pulling device 20 is spaced about 20-50 m from the manhole 11. This is to solve this, for example in the case of a three-phase cable, because the cables may be twisted together during transport. Therefore, the plurality of cables 13 can be wound around each of the plurality of reels 22 while eliminating them even if they are twisted together.

Each of the above devices or means may be arranged in advance or in the corresponding step in the method of collecting underground cables.

Figure 3 schematically shows an example of a waterproof cap that can be applied to the present invention.

Referring to FIG. 3, the waterproof cap 30 may include at least one spraying cleaning solution into the underground pipeline through the cap and the plurality of first holes 31 corresponding to the number of cables for fitting the plurality of cables 13. The second hole 32 is included.

When the three-phase cable is embedded in the ground, the number of the plurality of cables 13 is three, so that the plurality of first holes 31 are also three. Only one second hole 32 is formed so that one watering hose for spraying the washing liquid may be fastened to the second hole, and two or more holes may be fastened to each second hole. At this time, the watering hose may be a fire hose, the second hole 32 may have a structure in which the watering hose is fastened.

In addition, the waterproof cap 30 may be bolted to one end of the underground pipeline. For this purpose, a screw groove is formed at one end of the underground pipeline, and the bolt is coupled by penetrating the hole 33 formed in the waterproof cap 30. This can be done.

Figure 4 schematically shows an example of a ladder support that can be applied to the present invention.

Referring to FIG. 4, the ladder support 40 has a form including an upper roller 42a and a lower roller 42b respectively mounted between both ladder skeletons 41 and the ladder skeletons 41. The upper roller 42a and the lower roller 42b are rotatable to reduce friction between the cable, the lower roller 42b, and the upper roller 42a when the plurality of cables 13 are pulled out. If the horizontal part is in the shape of an angled bar like a general ladder, or if the rotation is not possible, the roller may rotate when the cable is pulled out, which may cause damage to the outer skin of the cable. Mold is preferred.

The plurality of cables 13 are drawn out of the manhole while being in contact with the lower portion of the lower roller 42b of the ladder-shaped support 40 installed in the manhole and in contact with the upper portion of the upper roller 42a.

The height and width of the ladder support 40 may be appropriately determined by the number of manholes or cables.

5 shows an example in which a pulling grip is applied to a plurality of cables.

Referring to FIG. 5, it can be seen that the pulling grip 50 having a basket form wraps from one end of the cable 13 to a predetermined portion. By using the pulling grip 50, a plurality of cables can be drawn out of the manhole at once.

Pulling grip 50 is used that can be expanded and restored in the basic state. First, the pooling grip is expanded in the basic state, the extended pooling grip is applied to the plurality of cables, and then the pooling grip is restored again, so that the plurality of cables are completely embedded in the pulling grip.

Figure 6 schematically shows an example of the tension dispersing means that can be applied to the present invention.

Referring to Figure 6, the tension dispersing means 60 may be made in the shape of a roller, in particular may be made of asymmetrical roller shape. In the case of the asymmetric roller as shown in Fig. 6, the length of the cable wound upon one rotation of the roller is longer than the length of the cable to be released.

Therefore, the cable in which the plurality of cables are wound on the plurality of reels by the winch of the cable pulling device is wound at a constant speed, and the tension distributing means 60 firstly winds the cable about three turns to distribute the tension applied to the cable. This can prevent the problem of breaking the cable when collecting the cable.

As described above, the underground cable collection method according to the present invention can prevent the damage of the outer sheath of the cable through the ladder-like support as shown in Figure 4, and also when pulling the cable, shown in Figure 6 Through the plurality of tension distributing means as described above, the cable is prevented from being broken by dispersing the tension applied to each cable.

In addition, according to the present invention, since the cable pulling device is positioned 20 to 50 m apart from the manhole, the cables are twisted when the cable is pulled and separated for each cable to prevent the cable from being wound on the reel or the cable is broken.

In addition, the present invention is to clean the cable before the collection of the underground cable, it is possible to collect in a clean state.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a flow chart schematically showing a method for collecting underground cables according to an embodiment of the present invention.

FIG. 2 schematically illustrates devices for implementing the method of collecting underground cables shown in FIG. 1.

Figure 3 schematically shows an example of a waterproof cap that can be applied to the present invention.

Figure 4 schematically shows an example of a ladder support that can be applied to the present invention.

5 shows an example in which a pulling grip is applied to a plurality of cables.

Figure 6 schematically shows an example of the tension dispersing means that can be applied to the present invention.

Claims (10)

By inserting the plurality of cables into each of the first holes of the waterproof cap using a waterproof cap having a plurality of first holes and at least one second hole corresponding to the number of cables embedded in the underground pipeline. Capping one end of the underground pipeline, and spraying a cleaning solution into the underground pipeline through the second hole of the waterproof cap to remove foreign substances on the plurality of cables; Disposing a ladder-type support for supporting the plurality of cables in a manhole connected with the underground pipeline; Putting a pulling grip on the plurality of cables, and using the pulling grip to pull out the manhole while supporting the plurality of cables with the ladder support; And Removing the pulling grip and winding each of the plurality of cables drawn out of the manhole by using a cable pulling device spaced apart from the manhole by a predetermined distance. The method of claim 1, And a plurality of tension distributing means for distributing the tension of each of the plurality of cables between the manhole and the cable pulling device. The method of claim 2, The plurality of tension distributing means is in the form of a roller, and after each of the plurality of cables is wound around the plurality of tension distributing means, the plurality of reel of underground cable, characterized in that wound on each of the plurality of reels included in the cable pulling device Collection method. The method of claim 3, And said plurality of tension distributing means is a roller having a left and right asymmetrical shape. The method of claim 1, The ladder support includes an upper roller and a lower roller, And the plurality of cables are in contact with a lower portion of the lower roller and an upper portion of the upper roller. The method of claim 1, The cable pulling device is a method of collecting underground cables, characterized in that spaced 20 to 50m from the manhole. The method of claim 1, And said plurality of cables is a three-phase cable consisting of three cables. The method of claim 1, And the waterproof cap is bolted to one end of the underground pipeline. The method of claim 1, The washing solution is a method of collecting underground cables, characterized in that the friction reducing agent is included. The method of claim 1, The cable pulling device is a method of collecting underground cables comprising a winch, a speed sensor and a plurality of reels.

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