JP2012229579A - Steel tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel tower for which workability can be improved.SOLUTION: A horizontal plane of the steel tower is a triangular plane, and the steel tower includes columnar main materials 2 provided along the vertical direction respectively at respective vertexes of the triangular plane. At least one of the plurality of main materials 2 comprises an integrally molded chevron-shaped member whose corner part 7 is an acute angle, and the corner part 7 forms a corresponding vertex. Typically, the triangular plane is an equilateral triangular plane, and the plurality of main materials 2 comprise an integrally molded equilateral chevron-shaped steel material whose corner part 7 is 60° on a horizontal section in an installed state respectively. Thus, the workability can be improved for a steel tower 1.

Description

  The present invention relates to a steel tower.

  Conventionally, steel towers used for various purposes such as power transmission towers, power distribution towers, towers equipped with communication antennas, and the like are known. As such a steel tower, various types such as a square steel tower, a square steel tower, an Eboshi steel tower, a gate pillar steel tower, and the like are adopted. For example, Patent Document 1 discloses a power transmission line tower in which a horizontal plane is a rectangular plane, and columnar vertical main members extending in the vertical direction are provided at respective vertices of the rectangular plane.

Japanese Patent Laid-Open No. 2004-300872

  By the way, the steel tower for power transmission lines described in Patent Document 1 as described above has room for further improvement, for example, in terms of improvement in workability.

  This invention is made | formed in view of said situation, Comprising: It aims at providing the steel tower which can improve workability | operativity.

  In order to achieve the above object, a steel tower according to the present invention is a steel tower whose horizontal plane is a triangular plane, and is provided with a columnar main material provided along the vertical direction at each vertex of the triangular plane. At least one of the main members is formed by an integrally formed chevron member having a corner having an acute angle, and the corner forms the apex corresponding thereto.

  In the steel tower, each of the plurality of main materials may be formed by an integrally formed chevron member whose corners are acute angles, and each of the corners may form the corresponding vertex.

  In the steel tower, the triangular plane is an equilateral triangular plane, and the plurality of main materials are each formed of an integrally formed equilateral mountain steel having a corner portion of 60 ° in a horizontal section in the installed state. Can be.

  The steel tower according to the present invention has an effect that the workability can be improved.

FIG. 1 is a perspective view illustrating a schematic configuration of a steel tower according to the embodiment. FIG. 2 is a front view illustrating a schematic configuration of the steel tower according to the embodiment. FIG. 3 is a plan view illustrating a schematic configuration of the steel tower according to the embodiment. FIG. 4 is a horizontal sectional view of the main material of the steel tower according to the embodiment. FIG. 5 is a plan view illustrating a schematic configuration of a steel tower according to a modification. FIG. 6 is a plan view illustrating a schematic configuration of a steel tower according to a modification.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment]
1 is a perspective view illustrating a schematic configuration of a steel tower according to the embodiment, FIG. 2 is a front view illustrating a schematic configuration of the steel tower according to the embodiment, and FIG. 3 is a plan view illustrating a schematic structure of the steel tower according to the embodiment. FIG. 4 is a horizontal sectional view of the main material of the steel tower according to the embodiment, and FIGS. 5 and 6 are plan views showing a schematic configuration of the steel tower according to the modification.

  A steel tower 1 according to the present embodiment shown in FIGS. 1, 2, and 3 is an elongated building along a vertical direction constituted by a steel framework structure provided on an upper part of a foundation embedded in the ground. A communication antenna (not shown) and their accompanying equipment are installed.

  The steel tower 1 of this embodiment is comprised including the some main material 2, the some submaterial 3, etc., and these are joined by a volt | bolt etc. mutually. In this steel tower 1, the horizontal plane (planar shape along the horizontal direction) is a triangular plane (see FIG. 3). And the steel tower 1 is a self-supporting ground-type triangular section steel tower provided with the columnar main material 2 provided along each vertical direction at each vertex of this triangular plane. The steel tower 1 is a steel tower having a chevron steel truss structure in which a plurality of main members 2 and a plurality of sub-materials 3 are each composed of a chevron steel material (so-called angle) as a chevron member.

  Specifically, a total of three main materials 2 are provided, one at each vertex of the triangular plane of the steel tower 1. Each main material 2 is a columnar member along the vertical direction, and a foundation structure made of concrete or the like is provided at each lower end portion. Each main material 2 is erected substantially vertically upward with the lower end supported by the foundation structure.

  The plurality of sub-materials 3 include, for example, a plurality of connecting members 4, a plurality of diagonal members 5, a plurality of buckling stiffeners 6 and the like as members that form a truss structure. The connecting member 4 is a cross member that is passed along the horizontal direction with respect to the pair of main members 2. The diagonal member 5 is a member that is passed while being inclined in the horizontal direction with respect to the pair of main members 2. The buckling stiffener 6 is a reinforcing member that is passed to the main member 2 and the diagonal member 5.

  In the steel tower 1, three main members 2 are positioned one at each apex of a triangular plane, and a plurality of sub members 3 are fixed by bolts or the like so as to tie adjacent main members 2 together. Thus, the plurality of sub-materials 3 constitute surfaces forming a truss structure between the three main materials 2. That is, since the steel tower 1 forms a triangular plane, three surfaces are configured by a truss structure. The steel tower 1 is configured such that the triangular plane is similar and gradually decreases from the surface side toward the upper side.

  And the steel tower 1 of this embodiment is aiming at the improvement of workability because at least 1 of the several main materials 2 is comprised by the acute angle angle steel material of integral molding.

  Specifically, as shown in FIG. 3 and FIG. 4, at least one of the plurality of main members 2 is formed of an integrally formed angle steel material with corner portions 7 having acute angles, and the corners of the main members 2 are formed. The part 7 forms a vertex in the triangular plane of the steel tower 1. Here, each of the three main members 2 is formed of an integrally formed angle steel with corners 7 having acute angles, and each corner 7 forms a corner at a corresponding vertex in the triangular plane of the tower 1. More specifically, the plurality of main members 2 of the present embodiment are constituted by an integrally formed equilateral mountain-shaped steel material in which the corner portion 7 is 60 ° in the horizontal section in the installed state.

  Each main material 2 is formed by, for example, extrusion molding, whereby a pair of flanges are integrally formed. Each main material 2 has a substantially V-shaped mountain shape in cross section along the horizontal direction, and the V-shaped corner portion 7 is an acute angle in the horizontal cross section in the installed state, in this case, 60 °. Yes. Strictly speaking, each main material 2 is provided on the foundation structure with the longitudinal direction having a slight inclination angle with respect to the vertical direction. For this reason, in the steel tower 1 of a regular triangular plane, the angle of the corner 7 in the cross section in the direction orthogonal to the longitudinal direction of each main material 2 is slightly larger than 60 °. Accordingly, each main material 2 is designed and determined in advance in accordance with the inclination angle such that the size, shape, angle of the corner 7 and the like are such that the corner 7 is 60 ° in the horizontal section in the installed state. The Each main material 2 is formed by integrally extruding a pair of flanges so as to have dimensions, shapes, angles of the corner portions 7 and the like determined according to the inclination angle. Each main material 2 is formed by using an integrally formed equilateral mountain-shaped steel material having a corner 7 of 60 ° in the horizontal section in the installed state, and at a corresponding vertex in the triangular plane of the tower 1 at 60 °. It is arranged so that the angle of is directed inward.

  That is, in the steel tower 1 of the present embodiment, the triangular plane is an equilateral triangular plane, and the corner 7 is 60 ° in the horizontal section in a state where the triangular plane is installed at each vertex of the equilateral triangular plane. A main material 2 composed of an equilateral mountain-shaped steel material is provided. In the horizontal section in the state in which the steel tower 1 is installed, the angle (60 °) of the corner portion 7 of the main material 2 made of the equilateral mountain steel material forms the inner angle (60 °) of each vertex of the triangular plane. It becomes.

  In the steel tower 1, the sub-material 3 such as the connecting material 4 is joined to the flange of each main material 2 via bolts 8, plates and the like.

  The steel tower 1 configured as described above includes at least one of the plurality of main members 2, and here, all three are formed of an integrally formed equilateral mountain-shaped steel material in which each corner portion 7 has an acute angle, and has a triangular plane. In this case, for example, a steel pipe column is used as a main material and a gusset plate is welded to form a joint portion, or a flat steel is combined and welded to be a main material. You can easily assemble a steel tower in a triangular plane.

  That is, the steel tower 1 is provided with a main material 2 made of an integrally formed equilateral mountain-shaped steel material having corners 7 each having an acute angle at each apex of a triangular plane. For example, each main material 2 and each sub-material 3 are provided. Can be joined by bolt joining without using welding joining or the like that requires quality control, and the manufacturing process of the main material 2 using flat steel or the like can be eliminated.

  Further, for example, in the case of using a 90 ° equilateral mountain steel material generally used as the main material located at the apex of the equilateral triangle plane, for example, at the joining portion with the secondary material, the flange of the 90 ° equilateral mountain steel material is used, for example. A member for adjusting the angle of the mounting surface, such as sandwiching between a pair of 15 ° inclined washers or providing a gusset plate, is required, which may reduce workability. However, with the steel tower 1 of the present embodiment, there is no need to provide such an angle adjusting member, and the main material 2 and the sub-material 3 can be joined with a simpler configuration, as described above. It is possible to suppress a decrease in workability.

  In other words, the steel tower 1 is an easy triangle-shaped steel tower with an inner angle of 60 °, which is easily formed using an integrally formed equilateral mountain-shaped steel material having a corner 7 of 60 ° in the horizontal section in the installed state. be able to. As a result, the steel tower 1 can, for example, reduce assembly man-hours (construction man-hours) on site, improve assembly accuracy, and easily ensure good quality. Therefore, the steel tower 1 can improve workability and can suppress manufacturing (construction) cost.

  Furthermore, the steel tower 1 can improve the cross-sectional performance of each main material 2 by configuring the corner portion 7 of each main material 2 at an acute angle, for example, compared with a 90 ° equilateral mountain steel material, The bending performance can be improved, and thereby the amount of steel frame in the entire steel tower 1 can be reduced, so that the manufacturing cost can be further suppressed.

  And since the steel tower 1 makes a triangular plane, the main material 2 becomes a total of three one each at each vertex of a triangular plane, and the surface which makes a truss structure also becomes three surfaces. For this reason, the steel tower 1 reduces the number of structural members which comprise this steel tower 1 significantly, such as the main material 2, the submaterial 3, and a foundation structure, compared with the square-shaped steel tower etc., for example, and the amount of steel frames is reduced. This can greatly reduce the number of joints and thereby reduce the number of assembling steps. Therefore, also in this respect, the steel tower 1 can reduce the production amount and the construction amount, can further improve the workability, and can suppress the manufacturing cost.

  For example, in the case of a 40 m high steel tower equipped with a communication antenna and their ancillary equipment under a design standard wind speed of 34 m / s, it relates to a comparative example of a rectangular plane using a 90 ° angle (equilateral mountain-shaped steel). While the amount of steel frame used in the steel tower is about 9.33 t, the steel tower 1 according to the embodiment of the triangular plane using the integrally formed 60 ° angle (equilateral mountain-shaped steel material) under the same conditions is about This is about 7.20t, which is a reduction of the steel frame amount by about 23%. In addition, the steel tower 1 according to the present embodiment has a joint portion of the main material 2, the secondary material 3, and the like from four to three parts, so that the simple comparison is made in comparison with the steel tower according to the comparative example of the rectangular plane. For example, the number of bolts used for joining is reduced by one surface, that is, by about 25%, and the amount of joining work is also reduced by about 25%.

  Moreover, since the triangular plane is an equilateral triangular plane, the steel tower 1 can have a geometrically more stable shape, and the main material 2 and the three basic structures can be made identical. Since the surfaces of the truss structure formed by 3 can be made identical, the design and manufacture can be performed more efficiently. Therefore, also in this point, this steel tower 1 can further improve workability and can suppress manufacturing cost.

  According to the tower 1 according to the embodiment described above, the horizontal plane is the tower 1 having a triangular plane, and includes the columnar main material 2 provided along the vertical direction at each vertex of the triangle plane. At least one of the main materials 2 is formed of an integrally formed chevron member in which the corner portion 7 has an acute angle, and the corner portion 7 forms a corresponding vertex. Here, the triangular plane of the steel tower 1 is an equilateral triangular plane, and the plurality of main members 2 are formed of an integrally formed equilateral mountain-shaped steel material having a corner 7 of 60 ° in the horizontal section in the installed state. The Therefore, this steel tower 1 can improve workability, for example, it becomes possible to reduce significantly the cost concerning steel tower construction.

  In addition, the steel tower which concerns on embodiment of this invention mentioned above is not limited to embodiment mentioned above, A various change is possible in the range described in the claim.

  In the above description, the steel tower 1 has been described as a steel tower on which a communication antenna is installed. However, the present invention is not limited to this and may be a power transmission tower, a power distribution tower, or the like.

  In the above description, the main material 2 has been described as being formed by, for example, extrusion molding. However, the present invention is not limited thereto, and any material may be used as long as a pair of flanges are integrally formed.

  Although the steel tower 1 demonstrated above demonstrated that all the three main materials 2 were comprised with the integrally formed angle steel material in which the corner | angular part 7 is an acute angle, it is not restricted to this.

  For example, as illustrated in FIG. 5, in the steel tower 201 according to the modification, at least one of the plurality of main materials 2 may be formed of an integrally formed angle steel material in which the corner portion 7 has an acute angle. These two may be the main material 202 comprised with a steel pipe. Even in this case, the steel tower 201 can improve workability in the main material 2.

  Although the steel tower 1 demonstrated above was demonstrated as a horizontal plane being an equilateral triangle plane, it is not restricted to this, An isosceles triangle and a flat triangle may be sufficient.

  For example, as illustrated in FIG. 6, the tower 301 according to the modified example has a horizontal plane that is a right-angled isosceles triangular plane, and one main material 302 a provided at a vertex that forms a right angle, and each vertex that forms 45 °. And two main materials 302b provided respectively. Each main material 302a, 302b is formed by extrusion molding, for example, and thereby a pair of flanges are integrally formed. The main material 302a is constituted by a 90 ° equilateral mountain steel material whose cross-sectional shape along the horizontal direction forms an approximately L-shaped mountain shape. Each main material 302b has a substantially V-shaped mountain shape in cross section along the horizontal direction, and the V-shaped corner portion 307 is an acute angle in the horizontal section in the installed state, which is 45 ° here. Yes. That is, each main material 302b is configured by an integrally formed equilateral mountain-shaped steel material having a corner portion 307 of 45 ° in a horizontal section in the installed state. Each main material 302a, 302b is arranged such that an angle of 45 ° or an angle of 90 ° faces inward at the corresponding vertex in the triangular plane of the steel tower 1. Even in this case, the steel tower 301 can improve workability.

1, 201, 301 Steel tower 2, 202, 302a, 302b Main material 3 Sub material 4 Tie material 5 Diagonal material 6 Buckling stiffener 7, 307 Corner 8 Bolt

Claims (3)

A steel tower whose horizontal plane is a triangular plane,
A columnar main material provided along the vertical direction at each vertex of the triangular plane,
At least one of the plurality of main materials is constituted by an integrally formed chevron member whose corner is an acute angle, and the corner forms the corresponding vertex,
Steel tower. The plurality of main materials are each constituted by an integrally formed chevron member with corners having acute angles, and the corners each form the corresponding vertex.
The steel tower according to claim 1. The triangular plane is an equilateral triangular plane;
The plurality of main materials are constituted by an integrally formed equilateral mountain-shaped steel material in which the corners are 60 ° in a horizontal section in a state where each is installed.
The steel tower according to claim 1 or claim 2.

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