JP4847790B2 - Steel pipe tower brace assembly reinforcement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bracket assembly reinforcing structure of a steel-pipe steel tower, which enables a bracket assembly of the existing steel-pipe steel tower to be simply/rapidly reinforced on a job site. <P>SOLUTION: The bracket assembly of the steel-pipe steel tower comprises right and left bracket portions which overhang in a rightward and leftward horizontal directions (X-directions) from a top portion of a steel-tower body. Each of the right and left bracket portions comprises a pair of horizontal overhanging materials and a pair of diagonal lifting materials. A free end of the horizontal overhanging material and that of the diagonal lifting material are joined to each other by means of a joint. The bracket assembly reinforcing structure of the steel-pipe steel tower comprises: front and back supporting materials which are laid in forward and backward horizontal directions (Y-directions) near a base end of the diagonal lifting material of each of the right and left bracket portions; a horizontal reinforcing material which is laid in the horizontal direction (X-direction) on each of the front and back supporting materials; a diagonal reinforcing material (stay) for connecting both end portions of each of the front and back supporting materials and an intermediate portion between both the ends of the horizontal reinforcing material in a horizontal plane (XY-surface); a tension adjusting joint which is provided in the intermediate portion of the horizontal reinforcing material; and a thrust-up material which is diagonally connected to both the ends of each of the front and back supporting materials and the steel-tower body in a vertical direction (Z-direction). <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a reinforcing structure for a steel tube tower arm bracket assembly, and more particularly, to a structure for reinforcing an oblique lifting member attachment portion of a steel pipe tower arm metal assembly using an arm metal balance method.

  Steel pipe towers are widely used for power transmission and transmission. For example, a steel pipe tower for power transmission has a brace assembly that protrudes horizontally from the top of the tower main body. A transmission line etc. is suspended in the armrest assembly, and the component for lowering the wire tension due to the weight of the power transmission line etc. and the height difference between adjacent steel towers acts on the slanted lifting material attachment part of the armrest assembly, and the The internal tensile stress acts continuously throughout. A severe impact load acts on the power transmission line or the like due to a strong wind such as a typhoon, and a large tensile stress is locally generated in the slanted lifting material mounting portion of the armor assembly.

  Investigation and analysis of the nodal strength of the steel pipe tower in the early days of establishment has not been sufficiently conducted. Therefore, the fact is that the light parts of the joint made of the gusset plate and the steel pipe are not reinforced. Further, at the time of ultimate strength of the joint, the cross section of the hollow steel pipe is locally flattened, and this cross-sectional deformation contributes to lowering the joint strength.

  For this reason, a reinforcing method in which cement is poured into the hollow steel pipe is conceivable. However, not only the weight of the steel pipe tower itself increases, but also cement injection work is extremely difficult in a site such as a mountainous area.

In particular, since the brace assembly is near the top of the steel tower body, the reinforcement work is more difficult.
Japanese Patent Application No. 10-083556

  It is an object of the present invention to obtain a steel pipe tower arm brace assembly reinforcing structure that can easily and quickly reinforce an existing steel pipe tower arm bracket assembly on site.

  The arm assembly of the steel pipe tower has a right arm part and a left arm part protruding from the top of the steel tower body in the horizontal direction (X direction). Each side arm part is composed of a pair of horizontal projecting members and a pair of diagonal lifting members. The free ends of the horizontal overhanging material and the oblique lifting material are connected to each other by a joint. The steel pipe tower arm brace assembly reinforcement structure consists of front and rear support members that are passed in the front and rear horizontal direction (Y direction) near the base end of the slanted lifting member of each side arm portion, and left and right horizontal directions to each front and rear support member Horizontal reinforcement members (in the X direction), diagonal reinforcement members (stays) that connect both end portions of each of the front and rear support members and intermediate end portions of the horizontal reinforcement members in a horizontal plane (XY plane), and horizontal reinforcement It consists of a tension adjusting joint provided in the middle of the material, and a push-up material that is obliquely connected to both ends of each front and rear support material and the tower main body in the vertical and vertical directions (Z direction).

  Here, the horizontal direction (X direction) refers to the horizontal direction parallel to the protruding direction of the armrest assembly of the steel pipe tower. The vertical direction (Z direction) refers to the vertical direction with respect to the foundation foundation. The front-rear horizontal direction (Y direction) refers to the front-rear depth direction perpendicular to the protruding direction of the armband assembly.

  The tension adjustment joint separates and separates the middle part of the horizontal reinforcement in the horizontal and horizontal directions (X direction), provides opposing flanges at each spaced end, inserts a spacer between the flanges, and bolts the flange and the spacer together. It has a tightened configuration. The bolt tightening force in the tension adjusting joint is about 50-100% of the tension acting on the horizontal member of the horizontal horizontal connecting member of the tower body connecting the base ends of the pair of diagonal lifting members of each side armor part. It is preferable to set to. If it is 50% or less, the reinforcing effect is small, and if it is 100% or more, an excessive stress level is generated in the attachment portion of the gusset plate where the hanging material connecting horizontal material is attached to the vertical support material.

  It is preferable to provide a diagonal reinforcing material (stay) that connects both end portions of each front and rear support member and both end intermediate portions of the horizontal reinforcing material within a horizontal plane (XY plane).

  The steel pipe tower arm brace assembly reinforcing structure of the present invention has a simple structure, and can easily and quickly reinforce the arm bracket assembly at the site of the existing steel pipe tower.

  With reference to FIGS. 1-8, the Example of the armrest assembly reinforcement structure of the steel pipe tower based on this invention is described. As a typical example of a steel pipe tower to which the present invention is applied, a steel pipe tower for power transmission is shown in FIG. The steel pipe tower 1 for power transmission is provided with a brace assembly 2 at the top of the tower body. The armband assembly 2 suspends a transmission line or the like (not shown). Here, the horizontal horizontal direction (X direction) refers to a horizontal horizontal direction parallel to the protruding direction of the bracelet assembly 2 as shown in FIG. The vertical direction (Z direction) refers to the vertical direction with respect to a foundation foundation (not shown). The front-rear horizontal direction (Y direction) refers to the front-rear depth direction orthogonal to the protruding direction of the armband assembly 2.

  The arm metal assembly 2 includes a right arm metal part 2R and a left arm metal part 2L that protrude in the horizontal direction (X direction) from the top of the steel tower body. The right arm part 2R is composed of a pair of horizontal projecting members 21R and a pair of oblique lifting members 22R, and the left arm part 2L is composed of a pair of horizontal projecting members 21L and a pair of oblique lifting members 22L. Become. The free ends of the pair of horizontal projecting members 21R and 21R and the pair of oblique lifting members 22R and 22R of the right arm portion 2R are coupled to each other by a joint 23R. Similarly, the free ends of the pair of horizontal projecting members 21L, 21L and the pair of oblique lifting members 22L, 22L of the left arm portion 2L are coupled to each other by a joint 23L.

  As shown best in FIGS. 4 and 5, the steel pipe tower arm brace assembly reinforcing structure according to the present invention is provided in the front-rear direction (Y The front and rear support members 24R passed in the direction), and the front and rear support members 24L passed in the front and rear direction (Y direction) near the base ends of the pair of oblique lifting members 22L and 22L of the left arm 2L, A horizontal reinforcing member 25 passed in the left and right horizontal direction (X direction) to each of the front and rear support members 24R and 24L, and both end portions of each front and rear support member and both end intermediate portions of the horizontal reinforcing member in a horizontal plane (XY plane). Up and down vertical direction (Z) to the diagonal reinforcement member (stay) 30 to be connected, the tension adjustment joint 26 provided in the middle of the horizontal reinforcement member 25, both ends of the front and rear support member 24R of the right armrest portion 2R, and the tower body. Direction) Push-up material 27R connected diagonally, and left armband part L consists of a vertical (Z direction) the push-up member 27L connected diagonally to the two ends and the steel tower body around support 24L of. 4 and 5, the steel tower main body to which the front and rear support members 24R and 24L are connected is the base end joints 28R and 28L of the horizontal projecting members 21R and 21L.

  6-8, the tension adjusting joint 26 separates and separates the intermediate portion of the horizontal reinforcing member 25 in the left and right horizontal direction (X direction), and is provided with opposing flanges 261 and 261 at each separated end. A spacer 262 is inserted between the flanges 261 and the flanges 261 and the spacers 262 are tightened together by bolts 263. The bolt tightening force in the tension adjusting joint 26 is obtained by connecting the horizontal ends 29 of the tower main body connecting the base ends of the pair of oblique lifting members 22R and 22L of the side arm portions 2R and 2L in the horizontal direction (see FIG. 5) is preferably set to about 50 to 100% of the tension acting on. If it is 50% or less, the reinforcing effect is small, and if it is 100% or more, an excessive stress level is generated in the attachment portion of the gusset plate where the hanging material connecting horizontal material is attached to the vertical support material.

  In order to stabilize the mounting position of the horizontal reinforcing member 25 and to use the truss axial force member as the front and rear support member instead of the bending member, both ends of the front and rear support members 24R and 24L as shown in FIGS. It is preferable to provide an oblique reinforcing member (stay) 30 that connects the portion and the intermediate portion at both ends of the horizontal reinforcing member 25 in a horizontal plane (XY plane).

  Next, with reference to FIGS. 9-11, the effect | action of the armrest assembly reinforcement structure of the steel pipe tower based on this invention is demonstrated.

  FIG. 9 is a side view of the armrest assembly 2 of the conventional steel pipe tower 1, wherein FIG. 9 (A) shows a schematic framework structure of the armrest assembly 2, and FIG. 9 (B) shows the framework of FIG. The load acting on is shown. As shown in FIG. 1A, the conventional steel pipe tower 1 is not provided with the horizontal reinforcing member and the push-up member that constitute the armrest assembly reinforcing structure. Therefore, as shown in FIG. (B), the weights W1 and W2 of the transmission line (not shown) on which the right and left arm portions 2R and 2L are suspended are the horizontal connecting material 29 and the vertical material connecting the suspension material of the tower body. It acts on the column material 31 as horizontal component forces H1 and H2 and vertical component forces V1 and V2, respectively.

  FIG. 10 is a drawing similar to FIG. 9, and in the case where only the horizontal reinforcing member 25 is provided in the arm metal assembly 2 of the conventional steel tube tower 1, FIG. 10A is a schematic skeleton of the arm metal assembly 2. A structure is shown, (B) figure shows the load which acts on the framework of (A) figure, (C) figure shows the bending moment which acts on diagonal lifting material 22R, 22L. (B) As shown in the figure, when the initial tension H is introduced by the horizontal reinforcing member 25, the horizontal component forces H1 and H2 are reduced by the initial tension H. The initial tension H to be introduced is preferably set to 50 to 100% of the horizontal axial force (H1 or H2) acting on the horizontal connecting member 29 in the horizontal direction. Below 50%, the horizontal component force reduction effect is small. If it is 100% or more, an excessive stress level is generated in the attachment portion of the gusset plate where the hanging material connecting horizontal material is attached to the vertical support material. The initial tension H is adjusted by the tension adjusting joint 26 described above.

  However, with the introduction of the initial tension H, a bending moment is newly generated in the oblique lifting members 22R and 22L as shown in FIG.

  FIG. 11 is a side view of the armrest assembly 2 of the steel pipe tower 1 to which the armrest assembly reinforcing structure according to the present invention is applied, and FIG. 11A shows a schematic framework structure of the armrest assembly 2. (B) The figure shows the load which acts on the framework of (A) figure. (A) As shown in the figure, the brace assembly reinforcement structure according to the present invention is provided with push-up members 27R and 27L in addition to the horizontal reinforcement member 25. By installing the push-up members 27R and 27L, oblique vertical forces V3 and V4 are generated, and the bending moment generated by the introduction of the horizontal reinforcing member 25 (see FIG. 10C) disappears. The total weight of the material used for reinforcement is supported by the push-up materials 27R and 27L. The increase in the load W of the reinforcing structure is balanced between the left and right arm parts according to the balance principle.

  A vertical load was loaded on the end of the armrest part of the frame model that modeled the panel near the armrest assembly. As the test body, a model without reinforcement (M0) and a model with reinforcement (M1) were prepared. Table 1 below shows the strength test results for a steel pipe having a diameter of 101.6 mm. The loading load was set to 200 kN as the upper limit depending on the test facility capacity.

  The reinforcement characteristic evaluation is shown in FIGS. 12A to 12D. (A) The figure shows the relationship between the test load and the amount of deformation (dent) in the steel pipe at the center position of the oblique lifting material gusset. Although the inclination of the steel pipe deformation amount is different at a load of about 60 kN, it changes linearly up to a load of 200 kN. It can be seen that the model with reinforcement (M1) has a higher effect of suppressing steel pipe deformation than the model without reinforcement (M0). (B) The figure shows the relationship between the test load and the oblique lifting material axial force. It can be seen that in the unreinforced model (M0), the axial force increases in proportion to the load. The model with reinforcement (M1) shows almost the same inclination as the model without reinforcement (M1) up to about 60 kN, but the inclination rises beyond this and the axial force transmitted to the slanting lifting material is small. Recognize. (C) The figure shows the relationship between the test load and the axial force transmitted to the reinforcement. The axial force transmitted from when the test load exceeds 60 kN is stable and increases linearly. The variation in transmission shaft force up to 60 kN is estimated to be due to the bolt hole gap of the reinforcing material. (D) The figure shows the relationship between the test load and the vertical load share of the reinforcing material. Prior to the start of the test, an initial tension is applied to the tension adjustment joint 26 so that a preliminary tension is applied to the reinforcing material. For this reason, the sharing rate starts from a high value of 80% or more. However, as the test load increases, the influence of the bolt hole gap decreases, and the sharing rate also decreases. Since the transmission to the reinforcing material is stable after the test load exceeds 60 kN, the change is linear.

  In summary, in the absence of reinforcement, the tube wall locally broke at the weld toe of the gusset plate for attachment of the hanger tie horizontal member 29. In the model with reinforcement (M1), the bypass effect of escaping the force transmitted to the main column steel pipe appears prominently, and when looking at the yield strength when the steel pipe is flattened by 25 mm, the yield increase rate with respect to the case without reinforcement is 280%. An excellent reinforcing effect was confirmed.

  The present invention is widely applicable not only to steel pipe towers but also to reinforcement of overhanging cantilever beams and the like of existing steel pipe structures.

It is a side view of the armrest assembly of a steel pipe tower, and shows the armature assembly reinforcement structure of the steel pipe tower based on the present invention. FIG. 2 is a plan view of a bracelet assembly as viewed from line II-II in FIG. FIG. 3 is a plan view of a bracelet assembly as viewed from line III-III in FIG. FIG. 4 is a partially enlarged plan view of FIG. 3 showing a brace assembly reinforcement structure of the present invention. It is a partially expanded side view of FIG. 1, Comprising: The armrest assembly reinforcement structure of this invention is shown. FIG. 6 is an enlarged side view of the VI-VI circle encircled portion of FIG. 5, showing a tension adjusting joint of a horizontal reinforcing material. It is a rear view of the flange part of the tension adjustment joint seen from the VII-VII line of FIG. It is a rear view of the spacer part of the tension adjustment joint seen from the VIII-VIII line of FIG. It is a side view of the armature assembly of the conventional steel pipe tower, (A) figure shows the outline frame structure of an armrest assembly, and (B) figure shows the load which acts on the frame of (A) figure. FIG. 9 is a drawing similar to FIG. 9, and in the case where only the horizontal reinforcing material is provided in the arm bracket assembly of the conventional steel tube tower, FIG. 9A shows a schematic framework structure of the arm bracket assembly, and FIG. (A) shows the load acting on the framework of FIG. (A), and (C) shows the bending moment acting on the diagonal lifting material of (A). BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the armrest assembly of the steel pipe tower to which the armrest assembly reinforcement structure based on this invention is applied, Comprising: (A) A figure shows the general | schematic framework structure of an armrest assembly, (B) FIG. A) A load acting on the framework of the figure is shown. It is a graph showing the proof stress characteristic of the armrest assembly of the steel pipe tower to which the armrest assembly reinforcement structure based on this invention is applied, Comprising: (A) The figure shows the load-steel pipe deformation amount characteristic, (B) The load-diagonal lifting material axial force characteristics are shown, (C) shows the load-horizontal reinforcement axial force characteristics, and (D) shows the vertical load sharing characteristics.

Explanation of symbols

1 (For power transmission) Steel pipe tower 2 Arm assembly
2R Right arm part 2L Left arm part 21R, 21L Horizontal projecting material 22R, 22L Diagonal lifting material 23R, 23L Joint 24R, 24L Front / rear support material
25 Horizontal reinforcement 26 Tension adjustment joint 27R, 27L Push-up material 28R, 28L Base end joint
29 Horizontal materials for suspension material 30 Diagonal reinforcement (stay)
31 Vertical support material 261 Opposing flange
262 Spacer 263 Bolt

Claims (3)

The steel pipe tower has a right arm and a left arm extending from the top of the steel tower main body in the horizontal direction (X direction), and each side arm has a pair of horizontal overhangs and a pair of diagonal lifting members. A bracelet assembly in which the free ends of the pair of horizontal projecting members and the free ends of the pair of slanted lifting members are connected to each other by a joint,
Front and rear support members passed in the front and rear horizontal direction (Y direction) in the vicinity of the base ends of the pair of slanting lifting members of each side armrest part;
A horizontal reinforcing material passed in the horizontal direction (X direction) to the front and rear support members;
Diagonal reinforcements (stays) for connecting both end portions of each front and rear support member and both end intermediate portions of the horizontal reinforcement member in a horizontal plane (XY plane);
A tension adjusting joint provided in the middle of the horizontal reinforcing material;
It consists of a push-up material that is obliquely connected to both ends of each of the front and rear support members and the steel tower body in the vertical and vertical directions (Z direction).
Steel pipe tower arm brace assembly reinforcement structure.   The tension adjustment joint separates and separates the horizontal portion of the horizontal reinforcing member in the horizontal and horizontal directions (X direction), provides opposing flanges at the respective separation ends, inserts a spacer between the flanges, and integrates the flange and the spacer. The armature assembly reinforcement structure of a steel pipe tower according to claim 1, wherein the structure is bolted to the armature.   The bolt tightening force in the tension adjusting joint is approximately the tension acting on the horizontal member of the horizontal horizontal direction of the tower body connecting the base ends of the pair of oblique lifting members of each side armrest part. The armature assembly reinforcing structure for a steel pipe tower according to claim 2, set to 50-100%.

Images