Description

UNINTERRUPTED REPLACEMENT METHOD OF CONCRETE

UTILITY POLE FOR DISTRIBUTION LINE USING POLE

CLAMP AND POLE CRUSHER

Technical Field

[1] The present invention relates to an uninterrupted utility pole replacement method for removing an existing utility pole and erecting a new utility pole in the process of maintenance and repair of an overhead distribution line, specifically to an uninterrupted replacement method of a concrete utility pole for a distribution line using a pole clamp and pole crusher, whereby work stability is excellent and utility pole replacement work can be carried out quickly and effectively, because a pole clamp mounted on an auger crane is used to fix the upper portion of the utility pole, and a separate pole crusher is used to cut the concrete ofthe utility pole to be replaced, and the lower side of the cut utility pole is removed and a new utility pole is installed in its place, so that an arm and wire of the utility pole to be removed can be relocated right away without extra work of temporary line relocation. Background Art

[2] In maintenance and repair of the current overhead distribution line, there are frequent occurrences of destruction of utility pole due to vehicle collision, etc. or replacement of deteriorated utility poles. In such a case, work is done in such a way that a new utility pole is erected near the utility pole to be removed, and the arm and wire installed in the removed utility pole are moved to the new utility pole by an uninterrupted method using a wire relocation apparatus.

[3] Namely, if an accident occurred when a car, for example, collided with a concrete utility pole, the collided portion would be damaged or the utility pole itself would be broken. And if the endurance limit of years of the concrete material is exceeded, it quickly deteriorates, so it should be replaced with a new utility pole in such a case.

[4] And in the case that a new utility pole cannot be erected near the utility pole to be removed, the new utility pole should be erected in the same place as the utility pole to be removed. In such a case because it is impossible to work by the uninterrupted construction method using the aforementioned wire relocation apparatus, work is done by applying an uninterrupted method using an auxiliary support device of a temporary transmission method using a bypass cable. Disclosure of Invention Technical Problem

[5] In the case of replacing utility poles without service interruption, if a new utility pole can be erected near the utility pole to be removed, there is not much problem with applying the uninterrupted method usingwire relocation apparatus. But if the new utility pole should be erected in the place where the utility pole to be removed was erected, the uninterrupted method using wire relocation apparatus cannot be applied. In such a case an uninterrupted method usingthe auxiliary support device can be applied, but it is uneconomical and inefficient because wire is temporarily moved uninterruptedly to an auxiliary support device made of an insulated auxiliary arm attached to an auger crane and the wire should be moved again to the new utility pole after the utility pole is replaced. Besides such a problem, there is another problem in applying this method that since it has a limitation of being applied only to a straight utility pole it is impossible for utility poles other than the straight utility pole to cope with the case that the allowable tensile load of the auxiliary support device is exceeded.

[6] Due to such a problem it is inevitable to work by applying the temporary transmission method using bypass cable. But it involves many problems such as requiring much construction cost, obstructing traffic due to equipment occupying the road, and risking safety of pedestrians and workers.

[7] In addition, in uninterrupted replacement work of utility polesas mentioned above, there is an inevitable case that a new utility pole has to be erected in the same place where the utility pole to be removed was erected due to the circumstances of the site where work is being done. To such a case was applied the uninterrupted method using an auxiliary support deviceor the temporary transmission method using bypass cable. But the method using the auxiliary support device has a problem in an inclined place that it can be restrictively applied only to a straight utilitypole since it exceeds an allowable tensile load of the auxiliary support device made of the insulated aux- iliaryarm, and the temporary transmission method using bypass cable also has many problems as mentioned above. Finally, both above-mentioned methods cannot be applied to the case where commonly installed communication equipments cannot be relocated on the same day.

[8] Namely, the uninterruptedreplacement work, which is the most general form of replacing utility poles, includes a series of work processes such as the process of relocating the arm and wire installedon the utility pole to be removed to the new utility pole by the uninterrupted method using wire relocation apparatus after the new utility pole is erected on one side of the utility pole to be replaced, and the process of completing the work by removing from the ground the utility pole to be removed after the relocation of the arm or wire is completed.

[9] But if a building or structure is erected around the place where the existing utility pole iserected, it is impossible to secure space for erecting a new utility pole; if it is

difficult to excavate the ground or surface, it is also impossible to secure space for erecting a new utility pole.

[10] So conventionally if it is impossible to sufficiently secure space for erecting a new utility pole, work is carried out by applying the method using an auxiliary support device or the method using bypass cable although they have problems as mentioned above. Moreover, because both methods cannot be applied in case where it is impossible to relocate commonly installed communication equipments on the same day, the deteriorated utility pole is not replaced and is left alone despite the fact that the replacement time has passed due to deterioration of the utility pole. Consequently, the utility pole is exposed to risks such as damage or destruction by natural disasters including typhoons, etc. Technical Solution

[11] The present invention is to solve the above-mentioned problems with an object to provide an uninterrupted replacement method of a concrete utility pole for a distribution line using a pole clamp and pole crusher, whereby utility pole replacement work can be carried out efficiently and safely under any conditions without the interference and influence of nearby buildings or structures and the ground around the utility pole to be replaced, because it is provided with a pole clamp mounted at an end portion of an auger crane boom and operated by hydraulic pressure, and a pole crusher fastened on the utilitypole by a hot-line bucket truck separately from the pole clamp, the utility pole to be removed is firmly clamped by the pole clamp mounted on the auger crane, and part of the utility pole is crushed and cut by the pole crusher that has hydraulic pressure supplied from the hot-line bucket truck, so that after the existing utility pole is removed with the arm or wire maintained without service interruption using the auger crane, a new utility pole can be erected in the same place and the arm or wire of the existing utility pole can be relocated to the new utility pole without service interruption.

Advantageous Effects

[12] According to the uninterrupted replacement method of a concrete utility pole for a distribution line using a pole clamp and pole crusher of the present invention, a new utility pole can be installed in the same place where the existing utility pole was erected when replacing a deteriorated or damaged existing utility pole without service interruption, so very effective work can be done even in a location constrained by place or space. And since relocation work goes on in such a way that the arm or wire is moved right away from the existing utility pole to the new utility pole, work is done very safely, and the uninterrupted utility pole replacement work isdone more quickly and conveniently by the use of a pole clamp mounted on the auger crane and the pole

crusher using a hot- line bucket truck. Therefore, the replacement work is not only efficient and safe but also is helpful to improving the quality of electric power supply since the scope of work for which uninterrupted power is possible is expanded. Brief Description of the Drawings

[13] Fig. 1 is a schematic view showing the installation process of a pole clamp according to an uninterrupted utility pole replacement method of the present invention;

[14] Fig. 2 is a schematic view showing the state in which the pole clamp is mounted on the utility pole according to the uninterrupted utility pole replacement method of the present invention;

[15] Fig. 3 is a schematic view showing the installation process of a pole crusher according to the uninterrupted utility pole replacement method of the present invention;

[16] Fig. 4 is a sectional view showing the utility pole crushing process using a pole crusher according to the uninterrupted utility pole replacement method of the present invention

[17] Fig. 5 is a sectional view showing the process of cutting rebarsaccording to the uninterrupted utility pole replacement method of the present invention;

[18] Fig. 6 is a schematic view showing the process of moving the cut utility pole according to the uninterrupted utility pole replacement method of the present invention;

[19] Fig. 7 is a schematic view showing the state in which a new utility pole is erected in the place of the removed utility pole according to the uninterrupted utility pole replacement method of the present invention; and

[20] Fig. 8 is a schematic view showing the process of relocating the arm and wire of a utility pole to a new utility pole according to the uninterrupted utility pole replacement method of the present invention.

Best Mode for Carrying Out the Invention

[21] Below will be described a preferred embodiment of the present invention with reference to the accompanying drawings.

[22] The present invention relates to an uninterrupted method of replacing a utility pole that is to be replaced due to damage or deterioration, and this is a new uninterrupted method of installing a new utility pole in the same place where the utility pole to be removed was erected.

[23] In the uninterrupted replacement method of the present invention, a separate pole clamp 10 is mounted on the end portion of the boom 101 of an auger crane 100, as shown in Fig. 1, and the pole clamp 10 is operated by hydraulic pressure supplied from the auger crane 100. And the binding chain 11 combined to the pole clamp 10 is

operated by hydraulic pressure, and plays a role of firmly binding the deteriorated utility pole 110 to be replaced.

[24] Namely, with the auger crane 100 moved close to one side of the deteriorated utility pole 110, the length of the boom 101 is adjusted to position the pole clamp 10 mounted on the end portion of the boom 101 at a predetermined part of the deteriorated utility pole 110.

[25] In this condition, the binding chain 11 of the pole clamp 10 is wound around and fixed to the deteriorated utility pole 110, and the binding chain 11 is pulled using hydraulic pressure supplied from the auger crane 100, so as to firmly fix the pole clamp 10 to the deteriorated utility pole 110, as shown in Fig. 2.

[26] And when it is confirmed that the deteriorated utility pole 110 is firmly fixed by the auger crane 100, a separate pole crusher 20 is mounted on the position lower than the pole clamp 10 as shown in Fig. 3. The pole clamp 10 is mounted on a predetermined outer circumference of the deteriorated utility pole 110 to be cut, with the pole crusher

20 moved toward the utility pole using a separate hot- line bucket truck 102.

[27] At this time the pole crusher 20 has a dividing-binding structure and is provided with an impacter 21 operated by hydraulic pressure suppliedfrom outside. Accordingly, the pole crusher 20 mounted on the deteriorated utility pole 110 to be cut supplies hydraulic pressure to the impacter 21 and when the crushing shaft 22 of the impacter

21 protrudes instantaneously toward the deteriorated utility pole 110 to impact, the concrete of the deteriorated utility pole 110 in contact with the crushing shaft 22 is crushed as shown in Fig. 4.

[28] Accordingly, when the impacter 21 is operated while the pole crusher 20 is rotated on the outer circumference of the deteriorated utility pole 110, the concrete of the impacted portion of the deteriorated utility pole 110 is completely crushed by the crushing shaft 22.

[29] In particular, when the portion to be cut of the deteriorated utility pole 110 is crushed by the pole crusher 20, concrete is removed from the deteriorated utility pole 110 made of reinforced concrete, and the remaining rebars 111 only are exposed. The remaining rebars 111 are cut using a welding torch or other cutting tool as shown in Fig. 5.

[30] Accordingly, with the concrete and rebars of the deteriorated utility pole 110 cut completely using a pole crusher 20 and welding torch, the auger crane 100 is operated to lift up the cut upper side utility pole gripped by the pole clamp 10 mounted on the end portion of the boom 101, and then move it to a nearby location where there is no obstruction to installation of the new utility pole and stand by.

[31] At this time, if low-tension lines or communication lines are installed on the lower side utility pole cut by thepole crusher 20 (that is, the utility pole portion that is still fixed on the ground), work is carried out to move these to the cut upper utility pole, so

that no arms, wires or communication lines remain on the lower utility pole to be removed.

[32] After dismantling and removing the pole crusher 20 in this condition, the lower utility pole 110 is removed from the ground surface.

[33] After this, a new utility pole 120 is erected and installed in the place where the deteriorated utility pole 110 was removed as shown in Fig. 7, and the relocation process of moving the arms 112, wires 113, etc. installed on the upper side of the deteriorated utility pole 110 to the new utility pole 120 is performed as shown in Fig. 8.

[34] Like this, after moving all of the arms 112, wires 113, transformer, low-tension lines and communication lines, the upper and lower sides of the deteriorated utility pole 110 are carried to a collection place for disposal.

[35] Thus, it is possible to erect a new utility pole in the same place as the existing utility pole by the uninterrupted utility pole replacement method according to the present invention in the cases of destruction as in the past regardless of problems such as buildings, structures or communication equipment nearby or even when faced with circumstances where it is normally impossible to replace deteriorated utility poles without service interruption. Therefore, very efficient and stable uninterrupted distribution line work and relocation work are possible in substitution for the uninterrupted method using an auxiliary support device or the temporary transmission method using bypass cable.

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Industrial Applicability

[37] According to the uninterrupted replacement method of a concrete utility pole for a distribution line using a pole clamp and pole crusher of the present invention, a new utility pole can be installed in the same place where the existing utility pole was erected when replacing a deteriorated or damaged existing utility pole without service interruption, so very effective work can be done even in a location constrained by place or space. And since relocation work goes on in such a way that the arm or wire is moved right away from the existing utility pole to the new utility pole, work is done very safely, and the uninterrupted utility pole replacement work isdone more quickly and conveniently by the use of a pole clamp mounted on the auger crane and the pole crusher using a hot- line bucket truck. Therefore, the replacement work is not only efficient and safe but also is helpful to improving the quality of electric power supply since the scope of work for which uninterrupted power is possible is expanded.

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