JP6467202B2 - Steel tower main column replacement method - Google Patents

Description

  The present invention relates to a main column material replacement method for a steel tower that enables replacement of each main column constituent member.

  The main pillar material replacement method for this type of steel tower is to construct an outer frame structure that surrounds the lower part of the steel tower, and to allow the outer frame structure to bear the load acting on the main pillar material of the steel tower. A method for exchanging the main pillar constituent members constituting the main pillar material is known (for example, cited document 1). Note that a plurality of main pillar materials (for example, four) are installed on the outer peripheral portion of the steel tower, thereby constituting a main skeleton part responsible for the main load acting on the steel tower. Each main pillar material is formed by vertically connecting a plurality of main pillar constituent members from the base to the top of the steel tower.

  The above-mentioned outer frame structure is provided with a jack support girder at the upper end of the part installed around the steel tower, and the jack is attached to the main column constituent member located above the main column constituent member to be replaced. By applying an upward driving force to the jack cradle, the compressive load already acting on the main pillar constituent member to be replaced is removed, thereby replacing the main pillar constituent member to be replaced. It is possible.

  That is, in the main column replacement method for a steel tower having the above-described configuration, the compressive load acting on the main column constituent member to be replaced is obtained by causing the driving force of the jack to act upward from the tower frame to the jack cradle. Thus, the main pillar constituent member to be exchanged can be replaced with a new main pillar constituent member.

  However, the above-described conventional method of replacing the main pillar material of a steel tower has a problem that a large tower external structure constructed so as to surround the steel tower is necessary. Moreover, when the driving force of the jack is applied to the jack cradle from the upper end of the tower frame located outside the steel tower, each main pillar material is inclined so as to enter the steel tower as it generally goes upward. Therefore, the distance from the part of the main pillar material in the jack cradle to the part receiving the driving force of the jack becomes long, and a large bending moment acts on the jack cradle, and the main pillar material also There is a problem that a large bending moment will act.

JP-A-10-153014

  The present invention has been made in view of the above circumstances, and provides a main column material replacement method for a tower that can reduce the bending moment acting on the main column material while reducing the size of the frame. Is an issue.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a main skeleton part is formed on the upper side of a foundation by a plurality of three or more main pillars arranged on the outer periphery, and each main pillar is It is formed by connecting a plurality of main pillar constituent members from the base on the base side to the top, and is formed so as to incline in the direction entering the inside of the main skeleton as it goes upward. A main column material replacement method for a steel tower, in which a frame is installed on the upper side of the foundation, and a load is transmitted to a main column component member located above the main column component member to be replaced among the main column component members After attaching the member, by applying a driving force of an actuator from the frame to the load transmission member, the load acting on the main column constituting member to be replaced is removed, and then the main target of the replacement target is removed. New column components Is adapted to replace the main column components, site driving force of said actuator in said Frames and said load transmitting member is applied is characterized in that located inside the main skeleton.

  According to a second aspect of the present invention, in the first aspect of the present invention, a tensile force or a compression force is applied to the replacement target main column component member based on a driving force acting in at least one of the expansion and contraction directions of the actuator. By applying a force, a load used as a compressive force or a tensile force is removed from the main pillar constituent member to be exchanged.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the load transmission member includes an upper edge portion of a protruding portion such as a gusset plate provided on an outer peripheral surface of each main pillar member, and It is characterized by being attached to a main pillar constituent member located above the main pillar constituent member to be replaced so as to be locked to at least one of the lower edge portions.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the frame has a portion where the driving force of the actuator acts on the uppermost portion, and is arranged on the uppermost portion. The driving force of the actuator acts on the frame and the load transmission member, and the actuator including the uppermost part is configured on the upper side of the foundation so as to be inside the main skeleton. It is characterized by having.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the frame is connected to a base part configured on an upper surface of the base. Is characterized in that it is configured to spread outward from the frame.

  The invention according to claim 6 is the invention according to any one of claims 1 to 3, wherein the frame has a part on which the driving force of the actuator acts on the uppermost part, and includes the uppermost part. Is moved up and down by the actuator arranged at the lowermost part, so that the driving force of the actuator acts on the frame and the load transmitting member, and the whole including the uppermost part and the lowermost part is the main part. It is characterized by being configured on the upper side of the foundation so as to enter the inside of the skeleton.

  The invention according to claim 7 is the invention according to claim 6, wherein the frame is connected to a base part configured on an upper surface of the base via the actuator. Is characterized in that it is configured to spread outward from the frame.

  According to the first aspect of the present invention, in the state in which each main column member is formed to incline so as to enter the inside of the main skeleton as it goes upward, the actuators in the frame and the load transmission member are driven. Since the part where the force acts is located inside the main skeleton part, even if the distance from the connecting part of the load transmission member to the main pillar component member to the part where the driving force of the actuator acts is shortened, the load The driving force of the actuator can be applied to the transmission member in the vertical direction. Therefore, the bending moment generated in the load transmission member based on the driving force of the actuator can be suppressed to a small level, and the main column member can be acted on by acting on the main column constituent member to which the load transmission member is attached. The bending moment can be kept small. Therefore, the reduction of the bending moment makes it possible to replace the main column constituent member more easily and safely.

  In addition, since the frame can be arranged inside the main skeleton, there is an advantage that it is possible to reduce the size, weight, equipment cost, and the like.

  According to the second aspect of the present invention, it is possible to apply the vertical force to the load transmitting member based on the driving force acting in at least one direction in the expansion / contraction direction of the actuator, and thereby the main object to be exchanged. A load acting as a compressive force or a tensile force on the column constituting member can be released. In other words, not only when a compressive load due to its own weight is applied to the main column material, but also when a tensile load is applied by receiving a force from an overhead wire, etc. The target main pillar constituent member can be replaced with a new one.

  According to the third aspect of the present invention, the load transmitting member is engaged with at least one of the upper edge portion and the lower edge portion of the projecting portion such as a gusset plate provided on the outer peripheral surface of each main column member. Therefore, the load transmission member moves along the axial direction of the main column member by the driving force acting from the actuator. Can be surely prevented.

  According to the invention described in claim 4, since the entire structure including the uppermost part of the frame is configured on the upper side of the foundation so as to enter the inside of the main skeleton, the size and weight of the frame can be reduced. It is possible to significantly reduce the facility cost.

  According to the fifth aspect of the present invention, the frame is configured to be connected to the base portion configured on the upper surface of the foundation, and the base portion is configured to spread outward from the frame. Therefore, it is possible to more reliably prevent the actuator from acting on the frame and moving in a direction in which the actuator tilts. In addition, by providing a weight (iron plate or other heavy object) on the base portion, it is possible to more reliably prevent the frame from changing. In particular, when a compressive force is applied to the main column constituting member to be exchanged, an upper force acts on a part of the frame as a reaction, and the upper force varies in a direction in which the frame is inclined. Can be surely prevented.

  According to the sixth aspect of the invention, the actuator is applied to the frame and the load transmitting member by moving the frame up and down using the actuator arranged at the lowermost part of the frame. A load only in the axial direction acts on the actuator, so that the bending moment is less likely to act. In addition, since the actuator can be operated on the ground, the safety of the main column material replacement work can be improved.

  According to the seventh aspect of the invention, there is an advantage that the actuator and the frame can be stably held by the base portion.

It is a front view which shows the steel tower which has four main pillar materials to which the main pillar material replacement construction method of the steel tower shown as one Embodiment of this invention is applied. The main pillar material located in the diagonal direction of the steel tower with four main pillar materials to which the main pillar material replacement method of the steel tower is applied, the frame installed on the upper side of the foundation block, and the load transmission member attached to the main pillar material It is a principal part front view which shows the actuator etc. which were provided in the frame. It is a figure which shows the principal parts, such as a steel tower which has four main pillar materials to which the main pillar material replacement method of the steel tower is applied, and a frame, (a) is a top view of FIG. 2, (b) It is a top view which shows the corner | angular part in the uppermost part of a frame, (c) is C arrow directional view of (b). It is a figure which shows the frame used in the main pillar material replacement construction method of the steel tower, (a) is a top view, (b) is a front view. One corner at the top of the frame used in the main column replacement method for the steel tower, the actuator provided on the corner to apply a tensile force to the main column, and the upper side of the main column component to be replaced It is a principal part front view which shows the load transmission member attached to the main pillar structural member located in FIG. One corner at the top of the frame used in the main column replacement method for the steel tower, the actuator provided on the corner to apply a tensile force to the main column, and the upper side of the main column component to be replaced It is a figure which shows the load transmission member attached to the main pillar structural member located in (1), (a) is sectional drawing which follows the VI-VI line of FIG. 5, (b) is BB of (a). (C) is an enlarged front view of an actuator. One corner at the top of the frame used in the main column replacement method of the steel tower, on the upper side of the actuator and the main column component to be replaced in order to apply a compressive force to the main column It is a principal part front view which shows the load transmission member attached to the main pillar structural member located. One corner at the top of the frame used in the main column replacement method of the steel tower, on the upper side of the actuator and the main column component to be replaced in order to apply a compressive force to the main column It is a figure which shows the load transmission member attached to the main pillar structural member located, Comprising: (a) is sectional drawing which follows the VIII-VIII line of FIG. 7, (b) is BB of (a). It is sectional drawing which follows, (c) is a top view of a support plate. It is the figure shown as the 1st other example regarding the main pillar material replacement method of the steel tower, Comprising: It is a principal part front view which shows the site | part where the driving force of the actuator acts on a frame and a load transmission member. It is the figure shown as the 2nd other example regarding the main pillar material replacement construction method of the steel tower, The state which has arranged the actuator in the lowest part of a frame, and the part where the driving force of the actuator acts on a frame and a load transmission member FIG.

  A main pillar replacement method for a steel tower as an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 8, the main pillar material replacement method of the steel tower shown in this embodiment is at least 3 in the circumferential direction on the upper side of the horizontal foundation surface (upper surface) 1 a of the concrete foundation block (foundation) 1. The present invention relates to a construction method that is carried out on the steel tower 2 in which the main skeleton part 20 is constituted by the main pillar members 21 arranged at a plurality of positions (four positions in this example). That is, by providing four main pillar members 21 on the outer peripheral portion of the steel tower 2, the main skeleton part 20 of the steel tower 2 is configured.

  Each main pillar 21 is formed by vertically connecting a plurality of main pillar constituent members 21a from the base on the base block 1 side to the top, and in a direction closer to each other (main skeleton 20 It is formed so as to incline in the direction of entering inward. Each main pillar constituting member 21a is formed of a cylindrical steel pipe, and is connected in the axial direction by bolts and nuts via flanges 21b provided at respective end portions in the axial direction.

  That is, in this main pillar material replacement method for a steel tower, as shown in FIG. 2, the frame 3 is installed on the upper side of the horizontal foundation surface 1a, and the main main component 21a to be replaced that requires replacement. After the load transmitting member 4 is attached to the main column constituting member 21a located on the upper side of the column constituting member 21A, the drive force of the actuator 5 is applied from the frame 3 to the load transmitting member 4 to thereby replace the main column constituting member to be replaced. After the load acting on 21A is removed, the replacement target main pillar constituting member 21A is replaced with a new main pillar constituting member 21a. In particular, a portion of the frame 3 and the load transmission member 4 on which the driving force of the actuator 5 acts is located inside the main skeleton 20, that is, inside the steel tower 2. When installing the frame 3, the frame 3 is constructed on the platform 30 after installing the platform 30 described later on the horizontal foundation surface 1 a. Further, the construction of the frame 3 is performed after removing a material that interferes with the construction from the stress members 23 described later.

  On the other hand, the steel tower 2 is in a state of rising upward from the horizontal foundation surface 1a by connecting the main pillar constituting member 21a at the base of the main pillar material 21 to, for example, the foundation top end portion 22 protruding from the horizontal foundation surface 1a. It is designed to be held stably. The base top end 22 is each position that divides the circumference of a predetermined diameter assumed on the horizontal base face 1a into four equal parts in the circumferential direction (that is, the position of each vertex of the square assumed on the base face 1a). It is formed by the cylindrical steel pipe which protrudes at a predetermined angle toward upper direction. Each main column member 21 is formed so as to be inclined in a direction approaching each other upward as described above, by connecting the main column constituting member 21a located at the base to the top of each base top end portion 22. Yes. The main pillar constituting member 21a and the base top end 22 are connected via a flange 22a provided at the top of the base top end 22 and a flange 21b provided at the base end of the main pillar constituting member 21a. They are connected by bolts and nuts.

  Further, as shown in FIG. 1, the steel tower 2 includes a plurality of stress members 23 such as a diagonal member, a horizontal member, and a belly member, which improve the overall strength by connecting the main pillar members 21 to each other. In this case, the main column member 21 and the stress member 23 are connected to each other by bolts and nuts via a gusset plate 24 as joint means provided on the outer peripheral surface of the main column member 21 by welding or the like. ing.

  As shown in FIGS. 2 and 3, the frame 3 is set to a size that enters the inside of the main skeleton 20 on the upper side of the horizontal basic surface 1 a. In this case, the upper surface of the uppermost part 3a of the frame 3 is formed in a square shape. And this square is a shape which substantially corresponds to the square of the shape which reduced the square obtained by connecting the base end part of each four main pillar materials 21 coaxially. That is, the frame 3 is constructed at a position where its vertical axis substantially coincides with the vertical axis of the steel tower 2 and each corner portion of the shape projecting at a right angle at the uppermost portion 3a is formed. It is constructed so as to be a position corresponding to each main pillar material 21 and a position close to each main pillar material 21.

  Further, as shown in FIG. 4, the frame 3 can be assembled at a predetermined height by vertically connecting pipes 31 arranged at portions corresponding to the four corners of the uppermost portion 3a. ing. In this case, the four pipes 31 on each floor are connected to each other adjacent to each other by a horizontal member 32 at each of the upper and lower portions, and are also connected by an oblique member 33 that obliquely intersects, thereby being integrated. It has become a high strength constructed. Each pipe 31 is formed of a cylindrical steel pipe, and is connected by bolts and nuts via flanges 31a provided at respective end portions in the axial direction.

  The uppermost pipe 31 is connected to a beam 34 made of H-section steel at the upper end. This beam 34 is composed of two flanges 34a extending in a strip shape and one web 34b connecting the flanges 34a, and each beam 34b is connected in a square frame shape with each flange 34a facing up and down. The uppermost part 3a is configured. In addition, the connection of the beam 34 for constituting the uppermost part 3a may be made by welding, or may be made disassembleable by using bolts and nuts.

  The uppermost portion 3a is configured such that the lower surface of each corner (the lower surface of the lower flange 34a) is connected to the flange 31a of the uppermost pipe 31 via bolts and nuts.

  Further, at each corner of the uppermost part 3a, the web 34b constituting each beam 34 is excluded, and ribs 34c and 34d are connected to the removed part so as to be orthogonal to the upper and lower flanges 34a. Yes. These ribs 34c and 34d are formed in a flat plate shape, and extend in the direction of 45 degrees with respect to one and the other sides forming each corner of the uppermost portion 3a in plan view, and It is formed in a length from one side to the other side.

  In addition, these ribs 34c and 34d are arranged on both sides of the axial center of the pipe 31 and spaced from each other so as to be the same distance from the axial center, thereby improving the strength of each corner. At the same time, the actuator 5 can be accommodated in the space between them. The ribs 34c and 34d are connected to the flanges 34a by welding. However, the ribs 34c and 34d may be detachably connected to the flanges 34a by bolts and nuts.

  Further, as shown in FIGS. 5 and 6, on the upper surface of each corner portion of the uppermost portion 3a (the upper surface of the upper flange 34a) is a seat plate 34e that holds the actuator 5 and reinforces the corner portion. Welded. A plurality of screw holes for fixing the actuator 5 with bolts are formed in the seating surface plate 34e. Furthermore, a pair of through holes 34f are formed in the seating surface plate 34e and the upper flange 34a at each corner. The distance between the pair of through holes 34f is set to a dimension that allows the actuator 5 to be accommodated therebetween.

  That is, as shown in FIGS. 7 and 8, each through-hole 34f is disposed below the upper flange 34a at the corner of the uppermost part 3a when compressive force is applied to the replacement target main pillar constituting member 21A. It is a hole for inserting a pair of stud bolts (bolts) 36a connected to a support plate 35 that supports the actuator 5 from below.

  Furthermore, as shown in FIG. 4, the uppermost portion 3a is covered with a steel plate 37 in which a portion surrounded by a square shape by the upper flanges 34a is flush with the upper surface of the flange 34a. Yes. The steel plate 37 is welded to each flange 34a. As a result, the uppermost part 3a of the frame 3 is formed in a planar shape on which the entire upper surface can be installed and the work using the device or the like can be performed. The steel plate 37 may be connected to each flange 34a so as to be disassembled by screws or the like.

  As shown in FIGS. 5 to 8, the load transmission member 4 includes a pair of upper and lower clamping members 41 for fixing to the main pillar constituting member 21 a, and a load receiving portion 42 coupled to these clamping members 41. It has a configuration. Each clamping member 41 is configured to include a first compression member 411 and a second compression member 412. Each of the first compression member 411 and the second compression member 412 has an arc-shaped inner peripheral surface that is in close contact with the outer peripheral surface of the main pillar constituting member 21a, and is provided at each end in the circumferential direction. By connecting and tightening with bolts and nuts via the flanges 411a and 412a, the main pillar constituting member 21a is firmly fixed.

  The load receiving portion 42 includes a bolt and a first compression member 411 that are positioned inside the main skeleton portion 20 (that is, inside the tower 2) when the holding member 41 is fixed to the main pillar constituting member 21 a. It is fixed by a nut. In this case, the load receiving portion 42 has a main plate portion 42a fixed to the upper and lower first compression members 411 by bolts and nuts, and a horizontal direction in a state where the main plate portion 42a is fixed to the upper and lower first compression members 411. The pressure receiving plate portion 42b welded to the main plate portion 42a so as to face, and the pressure receiving plate portion 42b and the main plate portion 42a are located at the center in the width direction and are welded to the pressure receiving plate portion 42b and the main plate portion 42a. And a reinforcing rib 42c.

  When the main plate portion 42a is connected to the upper and lower clamping members 41, the lower edge portion of the upper clamping member 41 engages with the upper edge portion of the gusset plate (projecting portion) 24, and the lower clamping member The connection position with each clamping member 41 is set so that the upper edge of 41 is locked to the lower edge of the gusset plate 24. If it is only necessary to apply a compressive force to the replacement target main column member 21 </ b> A by the actuator 5 described later, the lower edge portion of the upper clamping member 41 is locked to the upper edge portion of the gusset plate 24. If the actuator 5 only needs to apply a tensile force to the replacement target main column member 21 </ b> A, the upper edge of the lower clamping member 41 is locked to the lower edge of the gusset plate 24. You just have to do it.

  As shown in FIGS. 7 and 8, the pressure receiving plate portion 42b is provided with the actuator 5 below the upper flange 34a at the corner of the uppermost portion 3a, and the support plate 35 that supports the actuator 5 from the lower side. A pair of through-holes 42d are formed through which a pair of stud bolts 36a connected to each other are passed. In this case, the support plate 35 and the actuator 5 are arranged between the ribs 34c and 34d.

  As shown in FIGS. 8A and 8C, the support plate 35 is formed with a plurality of screw holes for fixing the actuator 5 with bolts at the center position of the upper surface, and from the center position in the longitudinal direction. A pair of through holes 35a into which stud bolts 36a are inserted are formed at positions equally distributed to each other. These through holes 35a are formed outside the range where the actuator 5 is placed, and are also formed in the pair of through holes 34f formed in the above-described seat surface plate 34e and the upper flange 34a, and the pressure receiving plate portion 42b. It is formed at the same pitch as the pair of through holes 42d.

  As shown in FIG. 6 (c), the actuator 5 is of a linear drive system by hydraulic pressure, and includes a main body portion 5a having a pair of cylinders and a pair of pistons 5b fitted in each cylinder. It has a configuration. The actuator 5 expands and contracts when the pistons 5b appear and disappear in parallel in the same direction, and exerts a driving force particularly in the extending direction. 2, 3, 6 (b) and 8 (b), 51 is a hydraulic control device for the actuator 5.

  As shown in FIGS. 7 and 8A, the stud bolt 36a is inserted into the through hole 35a of the support plate 35, the seat surface plate 34e, the through hole 34f of the upper flange 34a, and the through hole 42d of the pressure receiving plate portion 42b. In this state, the support plate 35 and the pressure receiving plate portion 42b are connected by screwing the nut 36b from both ends. In this case, the actuator 5 is placed on the support plate 35 and fixed with bolts, and the end of the piston 5a is in contact with the lower surface of the upper flange 34a in a state where the stroke in the extending direction of each piston 5a remains sufficiently. Therefore, the position of each nut 36b with respect to each stud bolt 36a is adjusted. Such a stud bolt 36 a is used when a compression force is applied to the main column member 21 by the actuator 5. That is, the actuator 5 uses the driving force acting in the extending direction as a downward force (ie, compressive force) toward the replacement target main column constituting member 21A via the support plate 35, the stud bolt 36a, the load transmission member 4, and the like. Accordingly, it is possible to remove the tensile load originally acting on the replacement target main column constituting member 21A.

  On the other hand, when a tensile force is applied to the main column 21 by the actuator 5, as shown in FIGS. 5 and 6, the actuator 5 is placed on the seat plate 34e and fixed with a bolt, and the extending direction of the piston 5a With the sufficient stroke remaining, the tip of the piston 5a comes into contact with the lower surface of the pressure receiving plate 42b. In this case, the actuator 5 can act as an upward force (ie, tensile force) on the replacement target main column constituting member 21A based on the driving force acting in the extending direction. It is possible to remove the compressive load originally acting on the main column constituting member 21A.

  In the frame 3, a portion corresponding to the seating surface plate 34 e is a portion on which the driving force of the actuator 5 acts. In the load transmission member 4, a portion corresponding to the pressure receiving plate portion 42 b is a portion on which the driving force of the actuator 5 acts.

  Moreover, the frame 3 mentioned above is connected with the base part 30 comprised on the horizontal foundation surface 1a, as shown in FIG.2, FIG3 and FIG.4 (b). The base portion 30 is connected to a frame 301 formed so as to spread outward from the uppermost portion 3a by an H-shaped steel similar to the H-shaped steel constituting the uppermost portion 3a of the frame 3, and to the lower surface of the frame 301. It has a configuration provided with an iron plate 302.

  The frame 301 uses a plurality of H-shaped steel flanges facing upward and downward, and arranges nine square frames 301a having the same size as the uppermost portion 3a of the frame 3 in three rows and three columns. Thus, it is configured to have a square outline as a whole. And the frame 3 is connected with the upper surface of the upper flange of the H-section steel which comprises the frame 301a located in the center. That is, the flange 31a of each pipe 31 located on the lowest floor of the frame 3 is fixed to the upper surface of each corner of the frame 301a located at the center via bolts, nuts and the like.

  The H-section steel that constitutes the frame 301 is of a length that can be transported by a truck or the like even if it is the longest, and can be assembled by connecting them with bolts and nuts. I have to. Moreover, even if the iron plate 302 has a maximum area, the iron plate 302 has a size that can be transported by a truck or the like, and is connected to the lower surface of the flange located on the lower side of the frame 301 with bolts and nuts. It has become. The iron plate 302 may be fixed to the upper surface of the flange located above the frame 301 with bolts and nuts.

  In the main column material replacement method of the steel tower configured as described above, in a state where each main column material 21 is formed to be inclined so as to enter the inside of the main skeleton 20 as it goes upward, Since the part where the driving force of the actuator 5 acts on the frame 3 and the load transmission member 4 is located inside the main skeleton 20, the driving force of the actuator 5 is determined from the position of the main column constituting member 21 a in the load transmission member 4. The distance to the acting position can be shortened as much as possible.

  For this reason, the bending moment generated in the load transmission member 4 based on the driving force of the actuator 5 can be minimized, and as a result, it acts on the main column constituting member 21a located on the upper side of the replacement target main column constituting member 21A. The bending moment can be made extremely small. Therefore, the replacement target main pillar constituting member 21A can be replaced with a new main pillar constituting member 21a more easily and safely.

  Further, by applying a driving force in the expansion / contraction direction (extension direction) to the load transmitting member 4 from the actuator 5 placed on the corner seating plate 34e in the uppermost part 3a of the frame 3, the replacement target main column constituting member 21A is applied. A tensile force can be applied to the. On the other hand, the actuator 5 mounted on the support plate 35 causes the driving force in the expansion / contraction direction (extension direction) to act on the upper flange 34a and the support plate 35 in the corner portion, and further the force acting on the support plate 35. By transmitting to the load transmission member 4 via the stud bolt 36a, a compressive force can be applied to the replacement target main pillar constituting member 21A.

  That is, since the upper or lower force can be applied to the load transmission member 4 based on the driving force that acts in the expansion / contraction direction of the actuator 5, the compression load that originally acts on the replacement target main column constituting member 21A. It is also possible to cancel the tensile load. That is, even when a compressive load due to its own weight or the like acts on the main column member 21 or when a tensile load acts upon receiving a force from an overhead wire or the like, a predetermined main column constituting member in the main column member 21 There is an advantage that 21a can be replaced with a new one.

  Further, the lower edge portion of the upper clamping member 41 of the load transmission member 4 is locked to the upper edge portion of the gusset plate 24, and the upper edge portion of the lower clamping member 41 is locked to the lower edge portion of the gusset plate 24. As a result, it is possible to reliably prevent the load transmission member 4 from moving downward or upward along the axial direction of the main column 21 by the driving force acting from the actuator 5.

  In addition, since the entire frame 3 including the uppermost part 3a is configured on the upper side of the foundation block 1 so as to enter the inside of the main skeleton part 20, the frame 3 can be reduced in size, weight, and equipment cost. Reduction and the like can be achieved.

  And the frame 3 is connected to the base part 30 comprised on the horizontal foundation surface 1a, and the base part 30 is comprised so that it may spread outside the uppermost part 3a of the frame 3. FIG. Therefore, even if the driving force of the actuator 5 acts on the uppermost part 3a of the frame 3, it is possible to reliably prevent the frame 3 from changing in the tilting direction. In addition, since the base portion 30 has a configuration in which the iron plate 302 is provided as a weight to the frame 301, the frame 3 can be more reliably prevented from changing. In particular, when compressive force is applied to the replacement target main column constituting member 21 </ b> A, it is possible to reliably prevent the frame 3 from being tilted by an upward force acting on a part of the frame 3 as a reaction.

  In the above embodiment, the upper and lower holding members 41 of the load transmission member 4 are configured to be locked to the gusset plate 24. However, for each of the holding members 41, for example, a flange 21b other than the gusset plate 24, You may comprise so that it may latch on the protrusion part provided in the other main pillar material 21. FIG.

  In addition, the base portion 30 is shown to include the frame 301 and the iron plate 302 as a weight. However, the base portion 30 may be configured by only the frame 301. Moreover, you may comprise so that the effect of prevention of the fall of the frame 3 may be heightened by mounting the heavy article which becomes further weight on the frame 301 or the iron plate 302, etc. In this case, it is preferable that the weight is placed on the frame 301 or a more peripheral portion of the iron plate 302.

  Further, the frame 3 is configured to be provided in the main skeleton portion 20, but may be configured to be provided in a plurality in the main skeleton portion 20. In addition, the frame 3 is configured to be built on the base portion 30, but may be configured to be directly built on the horizontal base surface 1 a without providing the base portion 30.

  Further, in the above embodiment, the main column constituting member to be exchanged via the load transmitting member 4 or the like by using the actuator 5 that generates a driving force in the extending direction of the expansion / contraction direction (single-acting actuator). Although it has been configured to apply an upward force or a downward force to 21A, the actuator 5 can generate a driving force in either the extending direction or the contracting direction (double acting) Type actuator). When a double-acting actuator is used as the actuator 5, for example, as shown in FIG. 9, the main body 5a is placed on the seat plate 34e on the upper flange 34a, and then the seat plate 34e, Further, if possible, the front end of the piston 5b is fixed to the upper flange 34a or the like with a bolt, and the bearing member 52 fixed to the lower surface of the pressure receiving plate 42b with a bolt is rotatably coupled via a pin 52a. It becomes possible to configure. In this case, there is an advantage that the support plate 35 and the stud bolt 36a described above are not necessary, and the structure is simplified. The portion corresponding to the seat plate 34e on which the actuator 5 is disposed in the uppermost portion 3a is a portion on which the driving force of the actuator acts, and the portion corresponding to the pressure receiving plate portion 42b in which the bearing member 52 is disposed in the load transmission member 4 is the actuator. This is the site where the driving force acts.

  Furthermore, as shown in FIG. 10, the actuator 5 may be used so as to exert a driving force that moves the entire frame 3 up and down by being arranged at the lowermost part of the frame 3. In this case, the actuator 5 is fixed to the flange with a bolt while the main body 5a is placed on the upper flange of the H-shaped steel constituting the frame 301, and the fixed joint 53 is connected to the tip of the piston 5b. After connecting or integrating, the fixed joint 53 is fixed to the lower surface of the flange 31a at the lowest position in the frame 3 with a bolt so that the frame 3 can be connected to the base part 30. Also good. The actuator 5 can stably support the entire frame 3 by disposing the actuator 5 below the lowermost flange 31a of each pipe 41 located at the four corners of the frame 3.

  In addition, with respect to the frame 3 in which the actuator 5 is arranged at the lowermost part, a part on which the driving force of the actuator acts is formed at the uppermost part 3a. That is, the bearing member 54 that is placed on the seat plate 34e of the uppermost part 3a and then fixed to the seat plate 34e, and if possible, the upper flange 34a by bolts, and the pressure receiving plate portion 42b of the load transmitting member 4 It is possible to connect each of the four corners of the frame 3 to each load transmission member 4 by a bearing member 52 that is fixed to the lower surface with bolts and a pin 52a that rotatably connects the bearing members 54 and 52 to each other. . In this case, a portion corresponding to the seating surface plate 34e on which the bearing member 54 is disposed in the frame 3 becomes a portion on which the driving force of the actuator 5 acts, and a portion corresponding to the pressure receiving plate portion 42b on which the bearing member 52 is disposed in the load transmission member 4. Becomes a portion where the driving force of the actuator acts. The actuator 5 is a double-acting actuator.

  When the actuator 5 is arranged at the lowermost part of the frame 3 as described above, there is an advantage that a load only in the axial direction acts on the actuator 5 and a bending moment can hardly be exerted. Moreover, since the operation of the actuator 5 can be performed on the ground, there is also an advantage that the safety of the main column material replacement work can be improved. Note that a single-acting actuator may be used as the actuator 5. Further, in place of the fixed joint 53 described above, a bearing member 52, a pin 52a, and the like may be used so that the actuator 5 and the flange 31a of the pipe 41 are rotatably connected. The bending moment acting on the actuator 5 can be further reduced.

1 basic block (basic)
1a Horizontal foundation surface (upper surface)
2 Steel tower 20 Main skeleton part 21 Main pillar material 21a Main pillar constituent member 21A Replacement target main pillar constituent member (main pillar constituent member to be replaced)
24 Gusset plate (protrusion)
3 Frame 3a Top 30 Base part 4 Load transmitting member 5 Actuator

Claims (5)

The main skeleton is formed on the upper side of the foundation by three or more main pillars arranged on the outer periphery, and each main pillar has a plurality of main pillar constituent members from the base on the side of the foundation to the top. It is formed by connecting, and is a main pillar material replacement method for a steel tower that is formed so as to incline in a direction entering the inside of the main skeleton as it goes upward,
A frame is installed on the upper side of the foundation, and a load transmission member is attached to a main column component member that is positioned above the main column component member to be replaced among the main column component members. By applying the driving force of the actuator to the transmission member, the load acting on the main pillar constituent member to be replaced is removed, and then the main pillar constituent member to be exchanged is replaced with a new main pillar constituent member. Is supposed to
The part where the driving force of the actuator acts on the frame and the load transmission member is located inside the main skeleton ,
The frame has a portion where the driving force of the actuator acts on the uppermost part, and the entire structure including the uppermost part moves up and down by the actuator arranged at the lowermost part, whereby the frame and the load transmission member The driving force of the actuator is applied to the upper part of the foundation so that the whole including the uppermost part and the lowermost part enters the inside of the main skeleton part,
The frame is configured to be connected to a base part configured on the upper surface of the foundation via the actuator, and the base part is configured to extend outward from the frame. ,
The actuator is configured such that a load point of the actuator is positioned on a vertical line of a portion where a driving force of the actuator acts on the frame and the load transmission member. Column material replacement method.   Based on a driving force acting in at least one direction in the expansion / contraction direction of the actuator, a tensile force or a compressive force is applied to the main pillar constituent member to be exchanged, thereby compressing the main pillar constituent member to be exchanged or The main pillar material replacement method for a steel tower according to claim 1, wherein a load used as a tensile force is removed.   The load transmission member is engaged with at least one of an upper edge portion and a lower edge portion of a projecting portion such as a gusset plate provided on an outer peripheral surface of each main pillar material, and the main pillar to be replaced The main pillar material replacement method for a steel tower according to claim 1 or 2, wherein the main pillar material replacement method is adapted to be attached to a main pillar constituent member located above the constituent member.   The frame has a portion where the driving force of the actuator acts on the uppermost part, and the driving force of the actuator arranged on the uppermost part acts on the frame and the load transmitting member, The main pillar material of a steel tower according to any one of claims 1 to 3, wherein the entire structure including the uppermost part is configured on the upper side of the foundation so as to enter the inside of the main skeleton part. Replacement method. The frame is adapted to be connected to a base part configured on the upper surface of the base,
The said pillar part is comprised so that it may spread outside the said frame, The main pillar material replacement | exchange method of the steel tower in any one of Claims 1-4 characterized by the above-mentioned.

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