JP5419587B2 - Replacement method and load measuring device for transmission tower members - Google Patents

Description

  The present invention relates to a power transmission tower member replacement method for measuring a compression load and a tensile load applied to the power transmission tower generated by a replacement tool used for replacement of a power transmission tower member, a load measuring device used for this replacement method, and a power transmission The present invention relates to a limit meter having a limit function for preventing overload from allowable stress of a steel tower.

  The load exerted on the transmission line by the replacement tool was obtained by converting the value of the hydraulic gauge attached to the hydraulic pump into the axial force of the hydraulic pump.

  However, this method has a problem in that an accurate load on the structure cannot be measured due to the low accuracy of the converted axial force due to the low measurement resolution and the error of the hydraulic gauge attached to the hydraulic pump.

  Conventionally, load gauges (load cells) incorporating strain gauges and strain gauges have been used to measure compression and tension loads applied to structures such as columns and beams. The load is measured by pasting it on the surface or attaching a load cell to a hydraulic jack.

  However, with this method, it is necessary to attach a strain gauge accurately to the surface of the structure every time it is measured, or to accurately place a load cell between the jack and the structure. This method is applicable to frequently used replacement tools. There is a problem that it is difficult to do.

JP 2005-350954 A

  As a method of measuring the load applied to the transmission tower by the replacement tool when replacing the deteriorated member of the transmission tower using the replacement tool, a load sensor for measuring the load is incorporated into the existing parts of the replacement tool. By combining parts, it is easy to mount the power transmission tower to be measured, and there is a need for a load measuring method and load measuring device that can perform highly accurate measurement regardless of the mounting state of the replacement tool to the power transmission tower. It has been.

  In the power transmission tower replacement method according to the present invention, a load measuring device is attached in combination with a replacement tool attached in the vicinity of a member to be replaced of the power transmission tower, and a load applied to the power transmission tower from the replacement tool is measured.

The present invention applies a compression or tensile load between the main pillars of the power transmission tower using a hydraulic jack when the members of the power transmission tower are replaced using a replacement tool, and is fixed to the main pillar of the power transmission tower with bolts. In the replacement method of the transmission tower member that removes or attaches the installed member, the load measuring device with the load cell incorporated is mounted on the replacement tool, and compression and tension applied to the main column of the transmission tower This is a replacement method of a power transmission tower member that can measure the load and prevent the load applied to the power transmission tower from being overloaded .

  Moreover, the load measuring device of the power transmission tower member of the present invention includes a power transmission tower member replacement method for measuring a compressive load and a tensile load applied to the power transmission tower by a replacement tool used for replacement of the power transmission tower member, The present invention relates to a load measuring device used in this replacement method and a limit meter having a limit function for preventing overload from allowable stress of a transmission tower.

  The load exerted on the power transmission tower by the replacement tool was obtained by converting the value of the hydraulic gauge attached to the hydraulic pump into the axial force of the hydraulic pump.

  However, this method has a problem that due to the low measurement resolution of the hydraulic gauge attached to the hydraulic pump and the magnitude of the error, the accuracy of the converted axial force is low, so that an accurate load on the transmission tower cannot be measured.

  Conventionally, load gauges (load cells) incorporating strain gauges and strain gauges have been used to measure compression and tension loads applied to structures such as columns and beams. The load is measured by pasting it on the surface or attaching a load cell to a hydraulic jack.

  However, with this method, it is necessary to attach a strain gauge accurately to the surface of the structure every time it is measured, or to accurately place a load cell between the jack and the structure. This method is applicable to frequently used replacement tools. There is a problem that it is difficult to do.

The present invention provides a load measuring device of the transmission tower member for measuring the compressive and tensile load applied to the main post and mounted between the main pillars of transmission tower, a load cell in a cylindrical body which is slidable inside the cylinder and the outer cylinder The cylindrical body containing the load cell is attached to the end of the replacement tool, and an end member is interposed between the other end of the cylindrical body and the main column, so that the compressive load and tensile load between the both ends of the inner cylindrical body can be reduced. It is a load measuring device for a power transmission tower member that is made to correspond to a load cell and can transmit a corresponding compressive load and tensile load from the load cell.

  Furthermore, the load indicator of the present invention has a limit function, and the allowable stress of the transmission tower studied by the load examination program at the time of replacement of the transmission tower member using the replacement tool is registered in advance. When a load greater than the allowable stress is applied, the limit function is activated and an overload is displayed.

  When the limit function is activated, the load applied by the hydraulic jack of the replacement tool is stopped before it becomes overloaded.

  The present invention is the load measuring device for a power transmission tower member according to claim 2, wherein the load meter displays a load measured by a load cell and has a limit meter having a limit function for preventing an overload from an allowable stress of the power transmission tower. .

  The present invention relates to a method for replacing a power transmission tower member in which the load applied to the main column of the power transmission tower is measured by a load cell attached to the replacement tool when the replacement tool is used to replace the power transmission tower member. Therefore, when replacing the deterioration member of the power transmission tower using the replacement tool, the load applied to the power transmission tower by the replacement tool can be measured.

  Further, the present invention provides a load measuring device for a power transmission tower member that is mounted between main columns and measures a load applied to the main column. The load cell is accommodated in a cylindrical body in which an inner cylinder and an outer cylinder are slidable, The cylindrical body containing the cylinder is attached to the end of the replacement tool, an end member is interposed between the other end of the cylindrical body and the main column, and the load cell is made to correspond to the compressive load and tensile load between both ends of the cylindrical body. Because it is a load measuring device for power transmission tower members that can transmit more compatible compressive load and tensile load, it can be measured by combining the existing part of the replacement tool with a part that incorporates a load sensor for measuring the load. Attachment to the target transmission tower becomes easy, and high-precision measurement is possible regardless of the state of attachment of the replacement tool to the transmission tower.

  Furthermore, this invention displays the load measured with the load cell, and provided the limit meter which has a limit function for preventing an overload from the allowable stress of a power transmission tower, The load measuring device of the power transmission tower member of Claim 2 Therefore, if the allowable stress of the transmission tower studied by the load examination program at the time of replacement of the transmission tower member using the replacement tool is registered in advance and a load larger than the allowable stress is applied, the limit function It is possible to indicate that has become overloaded.

It is a front view of the state which mounted | wore between the main pillars of the power transmission iron with the replacement tool of this invention. It is a top view of FIG. It is a front view of the load cell part and display meter of the replacement tool of this invention. It is a front view of the load cell part of the present invention. FIG. 5 is a right side view of FIG. 4. FIG. 5 is a plan view of FIG. 4. It is the front view which attached the replacement tool to the power transmission tower of this invention. FIG. 8 is a right side view of FIG. 7. FIG. 8 is a rear view of FIG. 7. FIG. 10 is a right side view of FIG. 9. The new and the old state of the main pillar material holding metal fitting of the replacement tool of this invention are shown. The expansion-contraction type member used as an intermediate member of the replacement tool of this invention is shown. The tower abdominal material replacement flow is shown.

  FIG. 1 shows a front view of a state in which the replacement tool of the present invention is mounted between main columns of a power transmission tower, and FIG. 2 shows a plan view of a state in which the replacement tool is mounted between main columns of a power transmission tower.

  The replacement tool 1 includes an end member 5 and an attachment band 6 with a relay material 4 interposed between a hydraulic jack 2 and a load cell 3, and is attached to a main column 7 of a power transmission tower.

  The hydraulic jack 2 is provided with a hydraulic inlet / outlet 8.

  The load cell 3 is accommodated in a cylindrical body 11 in which an inner cylinder 9 and an outer cylinder 10 are slidable.

  The cylindrical body 11, the end member 5, and the attachment band 6 that accommodate the hydraulic jack 2, the relay material 4, and the load cell 3 are screwed with bolts 12 and nuts 13, respectively.

  FIG. 3 is a front view of the load cell 3 portion of the replacement tool 1 and the display meter 14, and the load cell 3 and the display meter 14 are connected by a connection cord 15.

  The display meter 14 of the load display shown in FIG. 3 has a limit function for limiting the load applied to the power transmission tower. Register the allowable stress level of the transmission tower studied by the load examination program at the time of exchanging the transmission tower member using the replacement tool 1, and if a load greater than the allowable stress is applied, the limit function is activated. Indicates that an overload has occurred.

  4 is a front view of the load cell 3 part, FIG. 5 is a right side view of FIG. 4, and FIG. 6 is a plan view of FIG.

  7 is a front view in which a replacement tool is mounted on the transmission tower, FIG. 8 is a right side view of FIG. 7, FIG. 9 is a rear view of FIG. 7, and FIG. 10 is a right side view of FIG.

  7-10, the eight replacement tools 1 are mounted | worn between the main pillars 7 of a power transmission tower, and the seven replacement members 16 are replaced | exchanged. The replacement member 16 includes two B-A surfaces, two A-D surfaces, two DC surfaces, and one CB surface.

  The replacement tool 1 is attached to the top and bottom of the replacement member 16.

  Mark the mounting position and mount it so that it is horizontal.

  Securely tighten the bolts at each connection point.

  The replacement members 16 are replaced one by one, and the other replacement members 16 are not removed until the bolt tightening of the new material is completed.

  Before applying pressure to the hydraulic jack 2, check the connection of the hydraulic hose and tighten the bolts again.

  The replacement member 16 is removed after confirming that the replacement tool 1 is stressed.

  When the replacement of the replacement member 16 on one surface is completed, the replacement tool 1 is moved to the next surface, and the replacement member 16 is sequentially replaced.

  FIG. 11 shows the new and old shapes of the main pillar material gripping fitting of the replacement tool.

  The steel tower main pillar material gripping part of the conventional replacement tool has a structure in which the main pillar material 7 is sandwiched from both sides by the attachment band 6, and the contact point of the attachment band 6 formed in a straight line with respect to the circular main pillar material 7. Makes four point contacts.

  The new gripping bracket 21 has a shape in which the main pillar material 7 is sandwiched from the front and back, and the contact surface with the circular main pillar material 7 has a circular structure so that a large contact area can be obtained.

  As a result, there is very little risk of damage to the steel tower because it contacts the tower main column 7 in a wide area for both loads caused by compression and loads caused by tension.

  FIG. 12 shows a telescopic member used as an intermediate member of a replacement tool.

  The opening of the steel tower structure is narrow at the top of the steel tower and wide at the bottom of the steel tower due to the rolling of the main pillar material 7. Therefore, the length of the replacement tool used in various places of the steel tower structure also varies.

  Therefore, since replacement tools of various lengths are required, a telescopic member was produced for an intermediate member of the replacement tool. This is a telescopic structure in which the steel pipe has a double structure and the outer steel pipe 22 and the inner steel pipe 23 mesh with the concave and convex portions so that the structure can slide accurately and smoothly, and the length can be easily adjusted. It is an intermediate joint member.

  The steel pipe member has a double structure, and the outer steel pipe 22 and the inner steel pipe 23 have a structure in which concave and convex shapes are engaged and slid. After the outer steel pipe 22 and the inner steel pipe 23 are slid and expanded, pin joining holes opened in the outer steel pipe 22 and the inner steel pipe 23 are overlapped, and the joining bolt 24 is inserted and fixed from two orthogonal directions.

  FIG. 13 shows a tower bellows replacement flow.

  Before replacing one member of the tower structure using the replacement tool, obtain the allowable stress level of the tower structure by three-dimensional analysis, and compare the allowable stress level of the member with the load from the replacement tool. If the load of the steel tower exceeds the allowable stress level of the steel tower member, a flow chart will stop the member replacement by generating an alarm with the limit function so that the steel tower structure will not be damaged by the excessive load of the replacement tool It has become.

  The height of the transmission tower targeted by the present invention is 62000 mm, the hydraulic jack has a lift of 200 kN, an attractive force of 100 kN, a stroke of 250 mm, and a cylinder inner diameter of 60 mm.

  Although this invention was used for the load measurement in a power transmission tower, it can be used also for the load measurement of another steel tower structure.

DESCRIPTION OF SYMBOLS 1 ... Replacement tool 3 ... Load cell 7 ... Main pillar 9 ... Inner cylinder 10 ... Outer cylinder 11 ... Cylindrical body 5 ... End member

Claims (3)

When exchanging members of a power transmission tower using a replacement tool, a member that is compressed or tensioned between the main pillars of the power transmission tower by a hydraulic jack and fixed to the main pillars of the power transmission tower with bolts In the replacement method of the transmission tower member to be removed or installed,
A load measuring device that incorporates a load cell is installed in the replacement tool to measure the compressive and tensile loads applied to the main pillar of the transmission tower and prevent the load on the transmission tower from becoming overloaded. replacement method of transmission tower member that can be. In the load measuring apparatus by mounting between the main pillars of transmission tower compressing and tensile measuring a load applied to the main pillar, it houses a load cell in a cylindrical body which is slidable inside the cylinder and an outer cylinder, housing the load cell and attaching the cylinder to the end of the replacement tool and the end member is interposed between the other end and the main pillars of the cylinder, the compressive load across the inner cylinder, made to correspond to the load cell to the tensile load , load measuring apparatus that compressive load corresponding from the load cell, a tensile load can place. And displays the load measured by the load cell, the load measuring device of the transmission tower member according to claim 2, wherein provided a limit gauge with limit function for preventing excessive load from the allowable stress of the transmission tower.

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