JP2008199732A - Temporary supporting device of steel tower, and construction method of steel tower employing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temporary supporting device of steel tower which can ensure the safety factor of a steel tower while ensuring the safety distance between an overhead transmission line and the steel tower, and to provide a technology of the construction method of steel tower employing the temporary supporting device of steel tower. <P>SOLUTION: The temporary supporting device of steel tower for shifting an overhead transmission line temporarily on a steel tower supporting the overhead transmission line comprises an extension metal connected with the steel tower and supporting an overhead transmission line being shifted temporarily to be arranged on the outside of an existing overhead transmission line, and a joint for connecting the extension metal and the steel tower wherein the joint can reduce a load generated in the extension metal by releasing the supporting state of the temporary transmission line by the extension metal when the temporary transmission line is stretched in the transmitting direction and a predetermined load is generated in the extension metal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a temporary support device for a steel tower and a steel tower construction method using the same.

  It is necessary to secure a safe distance between the overhead power transmission line and the steel tower in the rebuilding work and repair work of the steel tower. Therefore, as a conventional technique, a technique for constructing a temporary iron tower, a technique for lengthening an existing armrest, and a technique for forming a cable for an overhead power transmission line are known.

The technology for constructing a temporary tower is to construct a temporary tower at a position away from the transmission route, switch the transmission route to a temporary transmission route using the temporary tower, and use the new transmission tower after the construction of the new tower. Switch to the power transmission route. For example, as described in Patent Document 1, the technique for increasing the length of an existing armrest is to temporarily widen the distance between a steel tower and a jumper line connected to an overhead power transmission line connected to both sides of the tower. Extension brackets are provided on the steel tower. The technique for forming an overhead power transmission line as a cable is a technique for covering the overhead power transmission line, which is a bare wire, with a cable.
JP-A-2005-304241

  It is required to secure a safe distance between the overhead power transmission line and the steel tower when rebuilding the steel tower or repairing the steel tower. Various techniques are known as techniques for ensuring a safe distance between an overhead power transmission line and a steel tower. For example, according to a technique for constructing a temporary tower, a safe distance between the overhead power transmission line and the steel tower can be ensured. . However, such technology has led to difficulties in land negotiations and increased construction costs associated with the construction and dismantling of new towers. In addition, according to the technology for increasing the length of the existing armrest, a safe distance between the overhead power transmission line and the steel tower can be ensured. However, if any one of the overhead transmission lines before and after being supported by the lengthened armature is cut, the average tension generated in the tower may increase, and the safety factor of the tower may decrease. Therefore, large-scale reinforcement (modification) occurs. Furthermore, according to the technique of forming an overhead power transmission line as a cable, work closer to that of the overhead power transmission line that is a bare wire can be performed. However, there is a limit to the voltage and transmission capacity of the overhead power transmission line, and it is necessary to use multiple cables to satisfy the capacity, and the load on the overhead power transmission line increases. There is a possibility that the weight of the electric wire is exceeded and the safety factor of the steel tower is lowered.

  The present invention has been made in view of the above-described problems, and relates to a temporary support device for a steel tower that can secure a safety distance between an overhead power transmission line and a steel tower and a safety factor of the steel tower, and a construction method for a steel tower using the same. The issue is to provide technology.

  In the present invention, in order to solve the above-described problem, an extension fitting that supports a temporarily installed overhead transmission line is generated in the extension fitting when a predetermined load, in other words, an unaverage tension of a steel tower increases. It was decided to connect to the steel tower through a connection part that reduces the load.

More specifically, the present invention relates to a steel tower temporary support device for temporarily moving the overhead power transmission line as a temporary power transmission line in a steel tower that supports the overhead power transmission line. An extension fitting that supports the temporary overhead transmission line so that the transmission line is arranged outside the existing overhead transmission line, and a connecting portion that connects the extension fitting and the steel tower, the temporary overhead transmission line When a predetermined load is generated in the extension fitting by being pulled in the power transmission direction, the connection portion that releases the support state of the temporary overhead transmission line by the extension fitting and reduces the load generated in the extension fitting, and Is provided.

  According to the present invention, the provisional overhead power transmission line can be arranged outside the existing overhead power transmission line by providing the extension fitting as described above. That is, it is possible to secure a safe distance between the overhead power transmission line and the steel tower, which is necessary for the steel tower rebuilding work or the steel tower repair work. In addition, according to the present invention, since the extension fitting is connected to the steel tower by the connecting portion as described above, it is possible to reduce the load generated on the extension fitting when a predetermined load is generated on the extension fitting. .

  Here, the extension metal fitting is connected to the steel tower, and supports the temporary overhead power transmission line so that the temporary overhead power transmission line that is temporarily relocated from the existing overhead power transmission line is arranged outside. Temporary relocation means that it will be relocated temporarily along with the rebuilding work of the steel tower. Note that the steel tower to which the extension metal fitting is connected includes a tower body and a brace provided in advance on the steel tower. By connecting the base end of the extension bracket near the tip of the armrest and connecting the temporary overhead transmission line to the distal end of the extension bracket, the temporary overhead transmission line can be easily placed outside the existing overhead transmission line. Is possible. The length of the extension metal fitting can be designed based on the distance between the steel tower and the temporary overhead power transmission line required for the rebuilding work of the steel tower. Note that the extension fitting may be provided with a length adjustment mechanism capable of adjusting its length. Thereby, it becomes possible to adjust the length of an extension metal fitting suitably to the length according to the field.

  The connection part connects the extension bracket and the steel tower. Further, the connection part releases the support state of the temporary overhead transmission line by the extension fitting when a predetermined load is generated in the extension fitting. Thereby, the load which generate | occur | produces in an extension metal fitting is reduced. The predetermined load means a load generated when the temporary overhead transmission line is pulled in the power transmission direction.

  Moreover, in the temporary support apparatus for a steel tower according to the present invention, the extension fitting forms the support state by supporting the temporary overhead transmission lines connected to the front and rear of the extension fitting in the power transmission direction, respectively, and the extension When a predetermined load is generated on the metal fitting, the support state is released by the connecting portion, and the load generated on the extension metal fitting is reduced by the release, and the temporary overhead power transmission line connected before and after the extension metal fitting You may make it form the cancellation | release state which supports one temporary overhead power transmission line among them.

  That is, the extension metal fitting according to the present invention has two states as a state of supporting the temporary overhead transmission line. One is a support state for supporting the temporary overhead power transmission line in a normal state, and the other is a release state for supporting the temporary overhead power transmission line when a predetermined load is generated in the extension fitting. In the support state, the extension fitting has a function similar to that of a brace provided on a general steel tower. In other words, the extension fittings respectively support the overhead power transmission lines that are stretched in the front-rear direction in the power transmission direction of the steel tower. That is, in the support state, the balance of tension is maintained between adjacent steel towers. On the other hand, the release state is a state in which the balance of tension is disturbed between adjacent towers, for example, when either one of the front and rear overhead power transmission lines is cut for some reason, that is, when the average tension increases. Refers to the state. When the non-average tension is increased, the load on the extension fitting and the load on the tower body are increased, and the safety factor of the tower may not be ensured. In the present invention, the extension bracket reduces the load on the extension bracket due to a predetermined load and forms a release state that supports the temporary overhead power transmission line. Therefore, even if a predetermined load occurs, the safety factor of the steel tower is increased. Can be secured.

  More specifically, for example, when a predetermined load is generated by cutting one of the temporary overhead power transmission lines connected before and after the extension fitting, the connection portion is disconnected. It is possible to reduce the load on the extension fitting in the released state by releasing the extension fitting in the power transmission direction opposite to the temporary overhead transmission line side.

  When any one of the overhead power transmission lines connected before and after the tower is cut, the non-average tension of the extension fitting and the tower increases. That is, the force pulled to the opposite side to the temporary overhead power transmission line to be cut works strongly. And, the extension bracket that supports the temporary overhead transmission line arranged outside the existing overhead transmission line has a stronger moment than the existing bracket, so the strength of the extension bracket is increased and the tower It is also necessary to reinforce the tower itself. However, in the present invention, it is possible to reduce the load generated on the extension bracket and the tower by escaping the extension bracket on the side opposite to the temporary overhead transmission line to be cut where stronger tension is generated. Therefore, it is possible to secure the safety factor of the steel tower with less reinforcement.

  Further, in the temporary support apparatus for a steel tower according to the present invention, the connection portion fixes the support member by fixing the extension metal part and the steel tower to a hinge part that connects the extension metal part to the steel tower so as to be rotatable in a substantially horizontal direction. And a fixing portion that breaks when the predetermined load occurs to release the support state and set the release state, and the extension fitting is configured so that the fixing portion is moved by the predetermined load. When it breaks, the hinge part may be rotated about the hinge in the direction of power transmission opposite to the temporary overhead power transmission line to be cut.

  The fixing portion according to the present invention fixes the extension fitting and the steel tower in the supported state, and breaks to release the fixation between the extension fitting and the steel tower when a predetermined load is generated. Since the extension fitting and the steel tower are connected via a hinge portion, when the fixing portion breaks, the extension fitting rotates around the hinge portion and transmits power on the side opposite to the temporary overhead transmission line to be cut. Guided in the direction. That is, the non-average tension of the extension fitting that increases due to cutting can be buffered by rotating around the hinge portion.

  The extension fitting may be directly connected to the tower body as described above, or may be connected to an existing arm. However, for example, when an extension fitting is connected near the tip of an existing arm, it is assumed that the existing arm is subjected to a load that exceeds the original design. And when the length of an extension metal fitting is set comparatively long and the space | interval of a temporary overhead power transmission line and a steel tower is widened, a load will also become larger to the existing brace. Therefore, in such a case, a reinforcing portion that is connected to the extension fitting and the steel tower and reinforces the support of the temporary overhead transmission line by the extension fitting may be provided. As a result, it becomes possible to reinforce the support of the temporary overhead power transmission line by the extension bracket, making up for the lack of strength of the existing brace.

  Moreover, this invention is good also as a construction method of the steel tower using the temporary support apparatus of the steel tower mentioned above. Specifically, the present invention is a construction method of a steel tower using a temporary support device for temporarily moving the overhead power transmission line as a temporary overhead power transmission line in a steel tower that supports the overhead power transmission line. Extension bracket for supporting the temporary overhead transmission line so that the existing overhead transmission line is retracted to the steel tower side and the temporary overhead transmission line is arranged outside the position of the existing overhead transmission line before being retracted When the temporary power transmission line is pulled in the power transmission direction and a predetermined load is generated on the extension fitting, the support state of the temporary transmission line is released by the extension fitting and is generated on the extension fitting. It connects with the said steel tower via the connection part which reduces load, moves the retracted overhead power transmission line outside, and connects it to the front-end | tip part of the said extension metal fitting as a temporary overhead power transmission line.

  According to the above construction method, it is possible to secure a safe distance between the overhead power transmission line and the steel tower, and to rebuild the steel tower or repair the steel tower. In addition, the steel tower temporary support device used in this construction method is, as described above, for example, even when a predetermined load is generated such as when the temporary overhead power transmission line is cut for some reason, compared to the conventional case. Since the safety factor of the tower is secured, it is possible to perform the rebuilding work and repair work of the tower more safely. In addition, it is not necessary to construct a separate temporary tower like the conventional technology for constructing a temporary tower, and it is possible to reduce land acquisition and temporary tower construction costs, and to significantly reduce the costs associated with the rebuilding work of the tower. Is possible.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to ensure the safe distance of an overhead power transmission line and a steel tower, the technique regarding the temporary support apparatus of the steel tower which can ensure the safety factor of a steel tower, and the construction method of a steel tower using this can be provided.

  Next, an embodiment of a temporary support device for a steel tower according to the present invention will be described based on the drawings.

(Constitution)
FIG. 1 is a side view showing a temporary support device for a steel tower according to this embodiment, and FIG. 2 is a plan view showing the temporary support device for a steel tower according to this embodiment. In addition, the temporary support apparatus (henceforth temporary support apparatus) 100 of the steel tower which concerns on this embodiment can be used when constructing new steel tower 1A on the existing track, as shown in FIG. By providing the temporary support device 100 on the arm 4 of the steel tower 1, it is possible to temporarily move the temporary overhead power transmission line 7 outside the existing overhead power transmission line 6 indicated by a dotted line.

  The temporary support device 100 according to the present embodiment includes an extension fitting 10 (corresponding to the extension fitting of the present invention) to which the temporary overhead power transmission line 7 is connected via the lever device 5, the existing extension fitting 10 and the existing tower 1. And a connecting device 20 (corresponding to the connecting portion of the present invention) for connecting the arm metal 4 of the above. Hereinafter, each configuration will be described in more detail. In addition, the material of each structural member which comprises the temporary support apparatus 100 is not necessarily limited. For example, what is necessary is just what has sufficient intensity | strength, such as a metal.

  The connection device 20 includes a connection plate 21 connected to the arm 3 of the arm 4 composed of the arm 3 and the arm suspension member 2, a rotating bolt 22 that supports the extension fitting 10 so as to be rotatable in the horizontal direction, and a connection plate 21. A temporary fixing bolt 23 for temporarily fixing the extension fitting 10 and a breaking bolt 24 that breaks when a predetermined load is generated on the extension fitting 10 are provided.

  The connection plate 21 is formed in a substantially triangular shape in a plan view in order to stably connect to the arm 3 of the arm metal 4. 4A is a plan view of the connection plate 21, and FIG. 4B is a side view of the connection plate 21. FIG. In the present embodiment, such a shape is used for stable connection with the arm 3 (see FIG. 2) of the triangular arm metal 4 in plan view, but the present invention is not limited to this. For example, the connection plate 21 may have a substantially rectangular shape in plan view.

  Further, in the connection plate 21, a rotating bolt through hole 211 into which the rotating bolt 22 is inserted and a temporary fixing bolt 23 are inserted in order from the steel tower 1 side on the substantially center line in the width direction toward the temporary overhead power transmission line 7 side. A fixing bolt through hole 212 and a breaking bolt through hole 213 into which the breaking bolt 24 is inserted are formed. A plurality of connection bolt through holes 214 into which the connection bolts 25 for connection to the arms 3 are inserted are formed at positions corresponding to the arms 3 of the arm metal 4.

  The rotating bolt 22 connects the extension fitting 10 to the connection plate 21 in a rotatable manner. That is, the rotating bolt 22 functions as a hinge, and the extension fitting 10 rotates around the rotating bolt 22 when a predetermined load is generated. FIG. 5 is a side view of the rotating bolt 22. As shown in the figure, the rotating bolt 22 is formed by a shaft portion 221 and a head portion 222, and the connection plate 21 and the second member 12 of the extension fitting 10 are sandwiched between the head portion 222 and a nut 223. The extension fitting 10 is rotatably connected.

The temporary fixing bolt 23 temporarily fixes the connection plate 21 and the extension fitting 10. That is, the temporary fixing bolts 23 are used in the process of building the temporary support device 100 in the steel tower 1, and are removed after the completion of the construction. After the temporary fixing bolt 23 is removed, the connection plate 21 and the extension fitting 10 are fixed by the breaking bolt 24. The temporary fixing bolt 23 can be formed by a shaft portion and a head portion as in the above-described rotating bolt 22 (see FIG. 5).

  Unlike the rotating bolt 22 and the temporary fixing bolt 23 described above, the breaking bolt 24 is formed of a material that breaks the shaft portion when a predetermined load is generated. Therefore, for example, when a predetermined load is generated in the power transmission direction and the predetermined load exceeds the proof strength of the breaking bolt 24, the breaking bolt 24 is broken, and the extension fitting 10 rotates in one of the power transmission directions. It rotates around the bolt 22 as an axis. FIG. 6 is a plan view showing a rotation state of the extension fitting when one of the temporary overhead transmission lines 7a and 7b supported by the extension fitting 10 is cut. As shown in the figure, when the temporary overhead power transmission line 7a (lower side in the drawing) is cut, the extension metal fitting 10 is subjected to a force pulled upward in the drawing. That is, the non-average tension for the extension fitting 10 increases. Then, although the extension metal fitting 10 is restricted in movement in the direction of power transmission by the breaking bolt 24, when a load is generated on the breaking bolt 24 and the breaking bolt 24 breaks, the extension fitting 10 rotates about the rotation bolt 22 to the upper side of the drawing. .

  If the break bolt 24 and the rotating bolt 22 are not provided, it is necessary to support the load pulled upward on the paper surface generated by cutting the temporary overhead power transmission line 7a at the tip of the extension fitting 10, and the extension fitting 10 is larger than usual. Similarly, a larger load than usual is applied to the tower 1 to which the extension fitting 10 is connected. Therefore, in order to maintain the strength of the extension fitting 10, in addition to configuring the extension fitting 10 with a material having higher strength, construction of reinforcing the tower body of the tower 1 itself, that is, exchanging and reinforcing the abdomen is necessary. There is concern about an increase in costs. However, according to the temporary support device 100 according to the present embodiment, a tensile force acts in the axial direction of the extension fitting 10 after the breaking bolt 24 is broken, so that the load on the extension fitting is reduced. Therefore, the safety factor of the steel tower 1 can be ensured at a lower cost than before.

  In this embodiment, the extension fitting 10 is formed by a first extension fitting member 11 and a second extension fitting member 12. The first extension fitting member 11 and the second extension fitting member 12 are connected by an extension fitting connection bolt 13. 7A is a plan view of the second extension fitting member 12, and FIG. 7B is a side view of the second extension fitting member 12. As shown in FIG. 8A is a plan view of the first extension fitting member 111, and FIG. 8B is a side view of the first extension fitting member 11. FIG.

  As shown to FIG. 7A and FIG. 7B, in the 2nd extension metal fitting member 12, the through-hole for rotating bolts which inserts the rotating bolt 22 in order toward the temporary overhead power transmission line 7 side from the tower 1 side on the width direction substantially centerline. 121, a temporary fixing bolt through hole 122 for inserting the temporary fixing bolt 23, and a breaking bolt through hole 123 for inserting the breaking bolt 24 are formed. Further, a plurality of extension fitting connection bolt through holes 124 into which the extension fitting connection bolts 13 to be connected to the first extension fitting member 11 are inserted are formed on the temporary overhead power transmission line 7 side with respect to the break bolt through hole 123. .

  8A and 8B, the first extension fitting member 11 is formed to be thicker than the connection plate 21 and the second extension fitting member 12, and one end of the reinforcing member 40 can be connected to the side surface. It is formed by various shapes. A plurality of extension fitting connection bolt through holes 111 for inserting the extension fitting connection bolts 13 are formed at positions corresponding to the extension fitting connection bolt through holes 124 of the second extension fitting member 12. When the first extension fitting member 11 and the second extension fitting member 12 are connected, the length in the longitudinal direction of the extension fitting 10 is adjusted by appropriately adjusting the through hole into which the extension fitting connecting bolt is inserted. Is possible.

A temporary overhead power transmission line 7 is connected to the distal end portion of the first extension fitting member 11 via the lever device 5. And since this temporary overhead power transmission line 7 is arrange | positioned outside the existing overhead power transmission line 6, the safe distance of the temporary overhead power transmission line 7 and the steel tower 1 in the rebuilding work of a steel tower is securable.

  According to the temporary support device 1 according to the embodiment described above, since the temporary overhead power transmission line 7 is disposed outside the existing overhead power transmission line 6, the overhead power transmission line required for the rebuilding work of the tower 1 A safe distance from the steel tower can be secured. Further, when the extension fitting 10 is connected to the tower 1 via the connection plate 21 by the rotating bolt 22 and the breaking bolt 24, and when a predetermined load is generated in the extension fitting 10, the extension fitting 10 attaches the rotating bolt 22. Since it rotates as an axis | shaft, the load which generate | occur | produces in the extension metal fitting 10 and the steel tower 1 can be reduced.

  In addition, in this embodiment, although the case where it applied to the rebuilding construction of the steel tower 1 was demonstrated as an example, it is not necessarily limited to this. For example, it can be suitably used for an operation where it is desired to temporarily relocate the overhead power transmission line, for example, several meters outside the existing overhead power transmission line. That is, in the repair work of the steel tower, a safe distance between the overhead power transmission line and the steel tower can be secured by relocating the existing overhead power transmission line to the outside, which can be preferably used.

<Reconstruction method>
Next, a steel tower rebuilding method using the temporary support device 100 according to the above-described embodiment will be described.

  First, it is necessary to select a method for rebuilding a steel tower using the temporary support device 100. Therefore, in the following description, after selection of a construction method is described, a rebuilding method of a steel tower using the temporary support device 100 according to the present embodiment (hereinafter referred to as a rebuilding method of the present invention) will be described.

  FIG. 9 is a flowchart showing selection of a construction method. First, in step S01, it is determined whether the underline can be changed. When the change under the line can be made, the temporary tower is constructed at another position by the conventional technique for constructing the temporary tower (step S04). On the other hand, if the change under the line cannot be made, it is determined in step S02 whether or not the site can be secured in the vicinity of the existing line. If the land can be secured, it is determined whether or not both lines of the tower can be stopped as the next step (step S03). If both lines can be stopped, a temporary tower is constructed at another position by a conventional technique for constructing a temporary tower (step S04).

  In step S02, when it is determined that the site cannot be secured in the vicinity of the existing track, the rebuilding method of the present invention is performed (step S05). If it is determined in step S03 that both lines of the tower cannot be stopped, it is determined in step S06 whether one of the lines can be stopped or whether it is possible to stop alternately. If it is determined that one line cannot be stopped or cannot be alternately stopped, the rebuilding method of the present invention is performed (step S05). On the other hand, if it is determined that one of the lines can be stopped or alternately stopped, it is determined in step S07 whether a safe distance between the overhead power transmission line and the tower can be secured.

  If it is determined in step S07 that a safe distance between the overhead power transmission line and the steel tower can be secured, it is determined whether a crane can be installed on the stop line side. If a crane can be installed on the stop line side, a temporary tower is constructed at a different position with current flowing through one of the lines (step S09). On the other hand, if it is determined in step S08 that a crane cannot be installed on the stop line side, it is determined in step S10 whether a tower crane can be installed. If it is determined in step S10 that a tower crane can be installed, a temporary tower is constructed at another position in a state where current is passed through one of the lines (step S09). On the other hand, when it is determined in step S10 that the tower crane cannot be installed, the rebuilding method of the present invention is performed (step S05).

  If it is determined in step S07 that a safe distance between the overhead power transmission line and the steel tower cannot be secured, it is determined in step S11 whether or not a technique for forming the overhead power transmission cable (for example, the CJ method) can be adopted. If it is determined in step S11 that a technique for forming an overhead power transmission line into a cable can be adopted, a temporary tower is constructed at a different position by a conventional temporary tower construction technique (step S04).

  On the other hand, if it is determined in step S11 that the technology for cable transmission of the overhead power transmission line (for example, the CJ method) cannot be employed, it is determined in step S12 whether the technology for increasing the length of the existing arm bracket (for example, the FJ method) can be employed. . If it is determined in step S12 that the technology for lengthening the existing arm cannot be adopted, the rebuilding method of the present invention is performed (step S05). On the other hand, if it is determined in step S12 that the technique for lengthening the existing arm can be adopted, the determination in step S08 is performed.

  As a result of selecting the construction method based on the above, when it is determined that the rebuilding method of the present invention is to be executed, the rebuilding method of the present invention is carried out according to the following procedure. FIG. 10 is a flowchart showing the rebuilding method according to the present invention.

  In step S21, the insulator device 5 connected to the tip of the existing arm 3 is retracted to the tower 1 side. 11A is a side view of the steel tower 1 showing a state before the rebuilding method according to the present invention is implemented, and FIG. 11B is a plan view of the steel tower 1 showing a state before the rebuilding method according to the present invention. FIG. 12A is a side view of the steel tower 1 showing a state in which the lever device 5 is retracted, and FIG. 12B is a plan view of the steel tower 1 showing a state in which the lever device 5 is retracted. When the operation in step S21 is completed, the process proceeds to the next step.

  In step S <b> 22, the temporary support device 1 described above is installed on the arm 3. More specifically, the connection plate 21 is first connected to the arm 3 using the connection bolt 25. In addition, when the arm 3 is previously provided with a through hole into which the connection bolt 25 can be inserted, this may be used. On the other hand, when such a through hole is not provided, a separate through hole is provided to connect the connection plate 21 to the arm 3. Next, the connection plate 21 and the extension fitting 10 (the first extension fitting member 11 and the second extension fitting member 12) are connected by the rotating bolt 22. The connection between the first extension fitting member 11 and the second extension fitting member 12 may be made in advance, or after the second extension fitting member 12 is connected to the connection plate 21. When the connection between the connection plate 21 and the extension fitting 10 by the rotating bolt is completed, the temporary fixing bolt 23 and the breaking bolt 24 are fixed in this order. Then, the reinforcing member 40 is connected to the tip of the extension fitting 10 and the steel tower 1 according to the strength of the arm 3. 13A is a side view of the steel tower 1 showing a state where the temporary support device 100 is attached, and FIG. 13B is a plan view of the steel tower 1 showing a state where the temporary support device 100 is attached. When the operation in step S22 is completed, the process proceeds to the next step.

  In step S <b> 23, the lever device 5 retracted in step S <b> 21 is moved to the distal end portion of the extension fitting 10. FIG. 14A is a side view of the steel tower 1 showing a state in which the lever device 5 is moved to the tip of the extension fitting 10, and FIG. 14B is a plan view of the tower 1 showing a state in which the lever device 5 is moved to the tip of the extension fitting 10. It is a figure. By performing the above steps S21 to S23, the attachment of the temporary support device 100 to the steel tower 1 is completed. When the attachment is completed, the temporary fixing bolt 23 is removed and the operation is finished. By removing the temporary fixing bolt 23, the extension fitting 10 is fixed to the connection plate 21 by the breaking bolt 24 thereafter. Therefore, when a predetermined load is generated in the power transmission direction, the break bolt 24 is broken, so that the extension fitting 10 rotates around the rotation bolt 22 in the power transmission direction. As a result, the load on the extension fitting 10 and the steel tower 1 can be reduced.

According to the rebuilding method of the present invention described above, it is possible to reduce the cost required for land acquisition, construction of a temporary tower, and removal. In addition, the construction period can be shortened. As a result, the distance between the steel tower and the overhead power transmission line can be increased at a lower cost than the conventional method.

  As mentioned above, although preferred embodiment of this invention was described, the construction method of the steel tower using the temporary support apparatus of a steel tower and the steel tower temporary support apparatus which concerns on this invention is not restricted to these, These combinations are included as much as possible. be able to.

It is a side view which shows the temporary support apparatus of the steel tower which concerns on this embodiment. It is a top view which shows the temporary support apparatus of the steel tower which concerns on this embodiment. It is a top view which shows the relationship between the existing steel tower and a new steel tower. It is a top view of a connection plate. It is a side view of a connection plate. It is a side view of a rotation bolt. It is a top view which shows the rotation state of an extension metal fitting. It is a top view of the 2nd extension metal fitting member 12. FIG. It is a side view of the 2nd extension metal fitting member 12. 3 is a plan view of a first extension fitting member 111. FIG. 3 is a side view of a first extension fitting member 11. FIG. It is a flowchart which shows selection of a construction method. It is a flowchart which shows the rebuilding construction method of this invention. It is a side view of the steel tower which shows the state before implementation of the rebuilding construction method of this invention. It is a top view of the steel tower which shows the state before implementation of the rebuilding construction method of this invention. It is a side view of the steel tower which shows the state which retracts an insulator apparatus. It is a top view of the steel tower which shows the state which retracts an insulator apparatus. It is a side view of the steel tower which shows the state which attached the temporary support apparatus. It is a top view of the steel tower which shows the state which attached the temporary support apparatus. It is a side view of the steel tower which shows the state which moved the lever apparatus to the front-end | tip of an extension metal fitting. It is a top view of the steel tower which shows the state which moved the lever apparatus to the front-end | tip of an extension metal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steel tower 2 ... Arm suspension material 3 ... Arm 4 ... Arm metal 5 ... Insulator device 6 ... Overhead power transmission line 7 ... Temporary overhead power transmission line 10 ... Extension metal fitting DESCRIPTION OF SYMBOLS 20 ... Connection apparatus 21 ... Connection plate 22 ... Rotary bolt 23 ... Temporary fixing bolt 24 ... Breaking bolt 100 ... Temporary support apparatus

Claims (5)

A temporary support device for a steel tower for temporarily moving the overhead power transmission line as a temporary overhead power transmission line in a steel tower that supports the overhead power transmission line,
An extension fitting that is connected to the steel tower and supports the temporary overhead power transmission line so that the temporary overhead power transmission line is arranged outside the existing overhead power transmission line,
A connecting portion that connects the extension fitting and the steel tower, and when the predetermined load is generated on the extension fitting by pulling the temporary overhead transmission line in a power transmission direction, the temporary transmission line by the extension fitting. A connection portion that releases the support state of the extension bracket and reduces the load generated on the extension fitting,
A temporary support device for a steel tower.   The extension fitting forms the support state by supporting the temporary overhead power transmission lines connected before and after the extension fitting in the power transmission direction, and when the predetermined load is generated on the extension fitting, the connection portion The support state is released by the release, the load generated in the extension fitting is reduced by the release, and the release state in which one of the temporary overhead transmission lines connected before and after the extension fitting is supported The temporary support apparatus of the steel tower of Claim 1 which forms. The predetermined load is generated by cutting one temporary overhead transmission line among the temporary overhead transmission lines connected before and after the extension fitting,
When the predetermined load is generated in the extension fitting, the connecting portion is configured to release the extension fitting in a power transmission direction opposite to the temporary overhead transmission line side to be cut, thereby loading the extension fitting in the released state. The temporary support apparatus of the steel tower of Claim 2 which reduces this. The connecting portion is
A hinge portion for connecting the extension fitting to the steel tower to be rotatable in a substantially horizontal direction;
Fixing the extension fitting and the steel tower to be in the supporting state, and having a fixing portion that breaks when the predetermined load occurs and releases the supporting state to make the releasing state,
The extension fitting rotates around the hinge portion in the power transmission direction opposite to the temporary overhead power transmission line side to be cut when the fixed portion is broken by the predetermined load.
The temporary support apparatus of the steel tower of Claim 3. A steel tower construction method using a temporary support device for temporarily moving the overhead power transmission line as a temporary overhead power transmission line in a steel tower supporting the overhead power transmission line,
The existing overhead transmission line supported by the tower is retreated to the tower side,
By extending the temporary aerial transmission line in the direction of power transmission, an extension fitting that supports the temporary aerial transmission line so that the temporary aerial transmission line is arranged outside the position of the existing aerial transmission line before evacuation. When a predetermined load is generated in the extension fitting, the support state of the temporary overhead transmission line by the extension fitting is released and connected to the steel tower via a connection portion that reduces the load generated in the extension fitting,
A construction method of a steel tower using a steel tower temporary support device in which the retracted overhead power transmission line is moved to the outside and connected to the distal end portion of the extension fitting as a temporary power transmission line.

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