JP2007204925A - Steel tower rebuilding method and work bench therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel tower rebuilding technology capable of safely and accurately carrying out basic system transmission line steel tower rebuilding work at a low cost within a short power transmission stop period of time. <P>SOLUTION: In the case the existing steel tower 1 is rebuilt, the steel tower rebuilding method constructing a new steel tower A makes good use of a built-up type work bench K installed around the existing steel tower. A plurality of expansible towers 2 are erected at a regular interval around the existing steel tower 1, a supporting member 3 is erected between the expansion/contraction towers, the first process installing the work bench by having a crane device 4 capable of moving along the supporting member, the second process constructing a foundation 5 for the new steel tower by making use of the crane device after the work bench has been installed and the third process assembling a new steel tower lower area of a part near to a charging section 1b of the existing steel tower from the foundation for the new steel tower while expanding/contracting the expansion towers are carried out. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steel tower rebuilding technique for constructing a new steel tower using an assembly-type work platform installed around the existing steel tower when rebuilding the existing steel tower.

  As a rebuilding method for a transmission line tower, a two-leg ½-side wrapping method shown in Patent Document 1, a cable jumper method shown in Patent Document 2, a simplified temporary construction method using a long jumper, and the like have been conventionally employed. These construction methods are so-called steel tower rebuilding methods by alternately stopping one line, but have the following problems.

  In the two-leg half-plane wrapping method, although the existing steel tower is given strength, there is a problem that the margin of the existing steel tower strength is small. Therefore, the period when typhoons and strong winds are expected cannot be adopted. This problem also applies to the raising method.

The cable jumper method cannot be used in terms of equipment capacity for ultra high voltage transmission lines. The long jumper method requires a simple support column. In the ultra high voltage transmission line, the clearance from the jumper is large, the support column becomes excessive, and the rebuilding method for the main transmission line tower such as the ultra ultra high voltage transmission line tower. Are often difficult to adopt.
JP 2000-345740 A JP 2000-270454 A

  On the other hand, instead of the steel tower rebuilding method by one-line alternating stop, a method of rebuilding the new steel tower after removing all existing facilities by stopping the charging of the section including the tower to be rebuilt has been adopted.

  In this construction method, the number of days of section charge stoppage varies depending on the scale of the equipment, the surrounding environment, etc., but after removing all the existing equipment, construction of the new foundation, assembly of the tower body, and overhead construction will be carried out. At that time, the existing steel tower may be removed after the construction of the new foundation in order to minimize the number of days of charge suspension.

However, this method has the following problems.
(1) Firstly, due to the rebuilding of towers, the number of days of section charge stoppage will be extended for a long time, but most of the large transmission lines are backbone transmission lines. It is difficult to obtain.
(2) Secondly, there is a problem that construction costs are increased due to long-term use of large heavy machinery, auxiliary cranes and the like.
(3) Thirdly, there is a problem that the working range, the height of the heavy machinery crane, and the like are greatly limited for work safety during charging of the transmission line.
(4) Fourthly, it is necessary to stretch a wire or an isolation net to mark the upper limit position of the work range at a high position directly under the live part. Temporary work to stretch these Is required.

  Therefore, the subject of this invention is providing the steel tower rebuilding technique which can implement backbone system power transmission line steel tower rebuilding construction safely, exactly, and at low cost in a short power transmission stop period.

In order to solve the above-mentioned problems, the present invention employs the following means.
The present invention is a tower rebuilding method for constructing a new tower using an assembly-type work platform installed around the existing tower when rebuilding an existing tower,
A plurality of telescopic towers are installed around the existing steel tower at intervals, a support member is installed between the telescopic towers, and a work platform is installed with a crane device that can travel along the support member. The first step;
A second step of constructing a foundation for a new steel tower using a crane device after installation of the work platform;
A third step of assembling the lower part of the new tower from the foundation for the new tower to the vicinity of the charging part of the existing tower while extending the telescopic tower;
It is characterized by performing.

  According to the present invention, the work platform installed around the rebuilding target tower (existing tower) can move the support member of the crane device up and down by the telescopic tower, and the crane device can move along the support member in the horizontal direction. . Therefore, when the telescopic tower is contracted and this work platform is installed at the lower part of the existing tower, the existing tower is charged and the foundation work for the new tower and the lower part of the new tower are maintained using the crane device. The assembly work of the area can be performed. In addition, by sequentially extending the telescopic tower, it is possible to perform assembly work on the entire lower area of the new steel tower directly below the charging unit. At this time, the height of the work platform or more is not within the work range, and the separation distance from the charging unit can be surely ensured, and the work safety can be enhanced.

  In the present invention, the step of removing the work platform after the assembly of the new tower lower region, the charging section of the existing tower after the removal of the work platform, the section charging stop state, the new tower assembly process of the upper region following the new tower lower region, It is desirable to perform the dismantling process of the existing steel tower. By assembling the lower area of the new tower and then moving to the upper area, it is possible to significantly reduce the number of days of power transmission stoppage (number of days of section charge stoppage).

  The work platform includes four telescopic towers arranged at four corners of a planar rectangle and four support members arranged to extend along each side of the planar rectangle, and at least two of the support members It is desirable that each of the crane devices is equipped. When such a work platform is used, each of the four support members can be equipped with a clay device. As a result, it is possible to simultaneously perform various types of work related to foundation work and steel tower assembly work using two or more crane devices, thereby improving work efficiency and shortening the work period. .

  The second step of constructing the foundation for the new steel tower includes pile driving work, excavation work, and concrete placing work, and it is desirable that at least one of these works be performed using a plurality of the crane devices. For example, in the pile driving work, the first crane device is used to hang the pile driving equipment, and the second crane device is used to build the reinforcing bar. Work can be done simultaneously. In particular, by making it possible to eliminate the need for an auxiliary crane for pile driving work, which has been necessary in the past, it has been the construction of one pile at a time because of the arrangement of equipment in confined areas. Become.

  In the third step of assembling the lower area of the new steel tower, it is desirable to carry out member carrying-in work and ground work necessary for steel tower assembly using the crane device. In this type of work, the crane device can travel along the horizontally arranged support member, so that it is possible to easily carry in the steel tower member to a position far from the carry-in / out port, for example, in a narrow area.

  In the third step of assembling the new steel tower lower region, it is desirable to extend the telescopic tower and install an isolation net for the charging part of the existing steel tower in the telescopic tower. If it does in this way, assembly work near the charge part can be made possible. In addition, the telescopic tower can be raised only during work and can be shrunk during non-work, thereby ensuring safety and stability.

  The present invention is an assembly-type work platform that is used around an existing steel tower when rebuilding an existing steel tower, and includes a plurality of telescopic towers installed at intervals around the existing steel tower, and its extension and contraction It was set as the structure provided with the supporting member constructed between towers, and the crane apparatus with which the traveling movement is equipped along the supporting member.

  According to this work platform, the height of the entire work platform can be lowered by making the telescopic tower contracted, and since it is an assembly type, assembly on the installation site can also be performed using a small crane, or It can be assembled relatively easily by wiring. In addition, by extending (raising) the telescopic tower, it is easy to make it extendable to just under the live parts of the tens of meters height like a backbone power transmission line, and with a simple structure. Can be realized.

  The work platform includes four telescopic towers arranged at four corners of a planar rectangle and four support members arranged to extend along each side of the planar rectangle, and at least two of the support members It is desirable that the crane apparatus is equipped with each. If comprised in this way, carrying in / out of equipment, materials, a steel tower member, etc., and carrying out of earth and sand can be enabled in several surrounding directions.

  The telescopic tower includes at least a first support column that is hollow inside and a second support column that is accommodated in the first support column and is provided so as to be movable up and down. Each of the first support column and the second support column is stacked in multiple stages. It is desirable that a plurality of box-type unit members connected to each other be provided, and a drive device for moving the second column up and down is provided between the second column and the first column. In the case of the telescopic tower having such a configuration, it becomes a configuration equivalent to a so-called climbing crane mast, and the work platform itself can be easily carried in and assembled at the work platform installation location.

  Preferably, the support member is supported by the first support column of the telescopic tower, and the upper end of the second support column is configured to extend upward from the upper end of the support member and the first support column. If comprised in this way, the height of a support member, ie, the height of a crane apparatus, can be made constant, workability | operativity can be improved, and the load added to a 2nd support | pillar becomes a self-weight of a 2nd support | pillar fundamentally. Therefore, the power mechanism for moving the second support up and down can be simplified.

  According to the present invention, because the work platform having the telescopic tower and the crane device is used, the backbone transmission line tower rebuilding work can be safely and accurately performed at a low cost in a short power transmission stop period.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG.1 and FIG.2 is the top view and side view which show the rebuilding object steel tower and work stand based on the Example of this invention. FIG. 3 is a front view showing a state in which the telescopic tower of the work platform is extended. 4 and 5 are diagrams illustrating the expansion and contraction principle of the telescopic tower. 6 to 13 are process diagrams showing work procedures.

In this embodiment, it has one side existing arm 11 and the other side existing arm 12 extending to one side and the other side of the existing tower 1 which is a rebuilding target tower, and the one side existing arm 11 and the other side existing arm 12 The example applied to the rebuilding method of the steel tower in which the one side overhead wire 13 and the other side overhead wire 14 are respectively wired in multiple stages via the suspension insulator device is shown.

  Here, a description will be given of an example of a rebuilding method in which the new steel tower A (see FIG. 3) is built in a form surrounding the existing steel tower 1 when the existing steel tower 1 on which the backbone transmission line is installed is rebuilt. At that time, an overhead line (power transmission line) that is energized (charged) is indicated by a white circle, and an overhead line that is disconnected (stopped) is indicated by a black circle.

  The steel tower rebuilding method according to the embodiment is a method of constructing the new steel tower A using the assembly-type work platform K installed around the existing steel tower 1 when rebuilding the existing steel tower 1. To implement.

  First, a plurality of telescopic towers 2 are erected at intervals around the existing tower 1, a support member 3 is installed between the telescopic towers 2, and a crane apparatus 4 that can travel and move along the support member 3 is provided. Equip and install work platform K (first step).

  The work platform K installed in the first step includes four telescopic towers 2 arranged at the four corners of the plane rectangle, and four beam-type support members 3 arranged to extend along each side of the plane rectangle. It has. Two of the four support members 3 that are parallel to each other are formed longer than the other two support members that are parallel to each other, and the longer two support members 3 and 3 are connected to the crane. Devices 4 and 4 are equipped respectively.

  Of course, the shorter support members 3 and 3 may be equipped with the crane device 4 to have a total of four units. For example, H-shaped steel or the like is used for each support member 3. Therefore, the crane apparatus 4 is configured as a Telha crane in the embodiment. In addition, before installing the expansion tower 2, the foundation 2a for expansion tower installation is constructed as needed. The telescopic tower 2 is fixed to the foundation 2a by bolting or the like.

  Each telescopic tower 2 includes an inner hollow first support column 21 disposed on the outside, a second support column 22 accommodated in the first support column 21 so as to be movable up and down, and a second support column 22. And a third support column 23 which is accommodated and provided so as to be movable up and down. That is, each telescopic tower 2 has a three-stage structure (see FIG. 3). The first support column 21, the second support column 22, and the third support column 23 are respectively configured by a plurality of box-type unit members 21a, 22a, and 23a that are stacked and connected in a plurality of stages. For each unit member, the same type as the unit member of a so-called climbing crane mast is adopted. Each unit member is made of aluminum in consideration of weight reduction. Of course, it can also be comprised with another metal.

  A drive mechanism is provided between the first column 21 and the second column 22 and between the second column 22 and the third column 23 to move the second column 22 and the third column 23 up and down. Has been. As shown in FIGS. 4 and 5, the drive mechanism includes a plurality of takers (pulleys) 24, a wire 25 wound around the takel 24, and a take-up device 26 for the wire 25. The second column 22 and the third column 23 are extended upward or contracted downward by performing a winding operation or a feeding operation.

Each support member 3 is supported by the first support column 21 of each telescopic tower 2 as shown, and the upper ends of the second support column 22 and the third support column 23 extend higher than the upper ends of the support member 2 and the first support column 21. It is configured to be able to. This configuration improves the workability by keeping the height of the support member 3, that is, the height of the crane device 4, and basically applies the load applied to the second support 22 to the own weight of the second support 22. In order to simplify the power mechanism that moves the second support column 22 up and down. Therefore, although an electric motor, a hydraulic motor, or the like can be used as a power source of the winding device 26, an example of a manual handle operation type is shown here.

  The installation work of the telescopic tower 2 of the work platform K configured as described above can be performed using a small crane carried into the installation site. However, when it is difficult to carry in a small crane, as shown in FIG. 6, a pulley 27 is attached near the leg of the existing tower 1, the tip of the wire 28 is fixed to the upper end of the telescopic tower 2, and the wire 28 The telescopic tower 2 may be raised by the work of winding the base end side by a winder 29 such as a manual winch or an electric winch.

  When the installation of the work platform K is completed in this way, then, as shown in FIG. 7, the work platform K having the crane device 4 is fully utilized to construct the foundation 5 for the new tower A (second process). ). In this second step, pile driving work, excavation work, concrete placing work, and the like necessary for constructing the foundation 5 for the new tower A are sequentially performed. In that case, in each operation | work, work efficiency is improved by performing using the two crane apparatuses 4 and 4. FIG.

  For example, in the pile driving work, as shown in FIG. 14A, the first crane device 4 hangs the pile driving equipment 51, and the second crane device 4 lays the reinforcing bar 52. To perform different tasks concurrently or perform the same type of work simultaneously. By doing so, it was possible to eliminate the need for an auxiliary crane for pile driving work, which was necessary in the past, so far, in narrow spaces, one pile was constructed due to the arrangement of equipment. Is possible.

  In excavation work, the excavated soil 53 can be carried out to the transport vehicle 54 using the crane device 4 as shown in FIG. Furthermore, in the concrete placing work, as shown in FIG. 14 (c), it is necessary to suspend the pipe 56 by the crane devices 4 and 4 and distribute it without using the boom of the concrete pump truck 55. The site can be used effectively.

  When the foundation work is completed in this way, then, as shown in FIG. 8, the part of the new tower is extended from the foundation 5 for the new tower A to the vicinity of the charging part 1 b of the existing tower 1 while extending each telescopic tower 2. Assemble the lower region (third step). In addition, the climb-up operation (extension operation) of each telescopic tower 2 is performed by operating the winding device 26 manually.

  In the process of assembling the lower area of the new tower A, as shown in FIG. 15A, the crane apparatus 4 is used to carry in the steel tower 57 necessary for the tower assembly, and the ground structure shown in FIG. Do work. In this type of work, the crane device 4 can travel along the horizontal support member 3, so that the steel tower member 57 can be easily carried into a position far from the loading / unloading port 58, for example, in a narrow area.

  In the step of assembling the lower region of the new steel tower A, as shown in FIGS. 9 and 10, the telescopic tower 2 is extended, and the isolation net 6 for the charging part 1 b of the existing steel tower 1 is installed in the telescopic tower 2. Since this isolation net 6 only needs to exist in the vicinity of the charging unit 1b, the third support 23 is raised after being attached to the third support 23 of the telescopic tower.

  By doing in this way, the assembly work of the steel tower to the charging part 1b vicinity can be enabled. Further, as shown in FIGS. 16 (a) and 16 (c), the telescopic tower 2 can be safely raised by, for example, only during daytime work and contracted as shown in FIG. 16 (b) when not working at night. And stability can be achieved.

When assembling the tower member 57 above the support member 3 in the assembly work of the lower area of the new tower, as shown in FIGS. 9 to 11, the telescopic tower 2 is extended to three stages, An upper end support member 31 is installed between the columns 23 and 23 and the upper end support member 31 is equipped with an upper crane device 41. The work at that time is performed inside the isolation net 6 so that the safety of the work can be ensured. In addition, the winch 43 of the upper crane apparatus 41 can also be arrange | positioned on the ground.

  When the assembly of the lower area of the new tower is completed in this way, each telescopic tower 2 is then contracted and the work platform K is removed as shown in FIG. 12 (fourth step).

  Next, as shown in FIG. 13, the charging unit 1 b of the existing tower 1 is set to the section disconnection stop state (disconnection state), and then the new tower assembly work and the existing tower dismantling work in the upper area following the new tower lower area. I do. Thus, by assembling the lower region of the new tower A and then moving to the upper region, it is possible to significantly reduce the number of days of power transmission stoppage (number of days of section charge stoppage). In addition, as shown in the same figure, the new tower assembly work of the upper region and the dismantling work of the existing tower can be performed by using an existing construction method using a normal crane, a climbing crane 7 or the like.

  According to this embodiment, the height of the work platform K can be lowered by bringing the telescopic tower 2 into a contracted state, and since it is an assembly type, a small crane or the like is used for assembly at the installation site. Or can be assembled relatively easily by wiring. In addition, by extending (raising) the telescopic tower 2, it is easy to make it extendable to just below the charging part 1b having a height of about 30 meters like a main transmission line, and this has a simple structure. Can be realized.

  A work space above the height of the work platform K does not become a work space, and a separation distance from the charging unit 1b can be reliably ensured. Further, the excavated soil 53 generated by excavation at a position far from the carry-in / out entrance 58 can be efficiently carried out in a narrow area. In addition, the steel tower member 57 can be ground around the steel tower.

The top view which shows the steel tower rebuilding work platform which concerns on the Example of this invention. The side view which shows the work platform of the steel tower rebuilding method which concerns on the Example of this invention. The front view which shows the steel tower rebuilding work platform which concerns on the Example of this invention. The principle figure of the drive mechanism of the steel tower rebuilding work stand which concerns on the Example of this invention. The principle figure of the drive mechanism of the steel tower rebuilding work stand which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the steel tower rebuilding method which concerns on the Example of this invention. The process figure which shows the foundation construction of the steel tower rebuilding method which concerns on the Example of this invention. The process drawing which shows the steel tower assembly example of the steel tower rebuilding method concerning the Example of this invention. Explanatory drawing which shows the example of a steel tower rebuilding method concerning the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing steel tower 1b Charging part 13,14 Overhead wire 2 Telescopic tower 21 First support column 22 Second support column 23 Third support column 21a, 22a, 23a Unit member 3 Support member 4 Crane device 5 New foundation 6 Isolation net K Work platform A New installation Steel tower

Claims (10)

When rebuilding an existing steel tower, it is a steel tower rebuilding method in which a new steel tower is constructed using an assembly-type work platform installed around the existing steel tower.
A plurality of telescopic towers are installed around the existing steel tower at intervals, a support member is installed between the telescopic towers, and a work platform is installed with a crane device that can travel along the support member. The first step;
A second step of constructing a foundation for a new steel tower using the crane device after the installation of the work platform;
A third step of assembling the lower part of the new tower from the foundation for the new tower to the vicinity of the charging part of the existing tower while extending the telescopic tower;
The steel tower rebuilding method characterized by performing.   A step of removing the work platform after assembly of the lower area of the new tower, and after removing the work platform, the charging section of the existing tower is in a section charge stop state, and a new tower assembly process of the upper area following the new tower lower area; The steel tower rebuilding method according to claim 1, wherein a dismantling process of the existing steel tower is performed.   The work platform includes four telescopic towers arranged at four corners of a planar rectangle and four support members arranged to extend along each side of the planar rectangle, and at least two of the support members The steel tower rebuilding method according to claim 1 or 2, wherein each of the crane devices is equipped.   The second step of constructing the foundation for the new steel tower includes pile driving work, excavation work, concrete placing work, and at least one of these works is performed using a plurality of the crane devices. The steel tower rebuilding method according to any one of claims 1 to 3.   In the 3rd process of assembling the said new steel tower lower area | region, the member carrying-in operation | work required for steel tower assembly and ground work are performed using the said crane apparatus, In any one of Claims 1-4 characterized by the above-mentioned. Steel tower rebuilding method.   The third step of assembling the lower area of the new steel tower is performed by extending the telescopic tower and installing an isolation net for the charging part of the existing steel tower in the telescopic tower. The steel tower rebuilding method described. When rebuilding an existing steel tower, it is an assembly-type work platform that is used around the existing steel tower,
A plurality of telescopic towers standing around the existing steel tower at intervals,
A support member constructed between the telescopic towers;
A crane device that is movably mounted along the support member;
It is equipped with a steel tower rebuilding work platform.   The work platform includes four telescopic towers arranged at four corners of a planar rectangle and four support members arranged to extend along each side of the planar rectangle, and at least two of the support members The tower rebuilding work platform according to claim 7, wherein the crane device is equipped with each of the crane towers. The telescopic tower includes at least a first support column that is hollow inside and a second support column that is accommodated in the first support column and is provided so as to be movable up and down. Each of the first support column and the second support column is stacked in multiple stages. The drive mechanism which moves the 2nd support | pillar up and down is equipped between the 1st support | pillar and the 2nd support | pillar. Steel tower rebuilding work platform.   The steel tower rebuilding work according to claim 9, wherein the support member is supported by a first support column of the telescopic tower, and an upper end of the second support column can extend upward from an upper end of the support member and the first support column. Mount.

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