Steel tower leg and method for manufacturing steel tower leg

Abstract

Provided are a steel tower leg and a method for manufacturing a steel tower leg that can suppress the occurrence of distortion caused by heat during manufacturing. [Solution] The leg member 22 comprises a metal main body 38 extending in a predetermined direction, and a plate-shaped metal base 40. A through-hole 50 is formed in the base 40, penetrating in the predetermined direction, and an end 38B of the main body 38 is fitted into this through-hole 50 in the predetermined direction.

Description

[Technical Field]

[0001] The present invention relates to a steel tower leg and a method for manufacturing a steel tower leg. [Background technology]

[0002] Patent Document 1 below describes an invention related to a steel tower foundation structure. In this steel tower foundation structure, a part of the steel frame leg of the steel tower is configured to include a main body made of angle iron and a base made of flat steel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2025-060214 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above prior art, the main body and the base are joined by welding, and after joining them, it is necessary to remove distortion of the base caused by heat during welding.

[0005] In consideration of the above facts, the present invention aims to provide a steel tower leg and a method for manufacturing a steel tower leg that can suppress the occurrence of distortion caused by heat during manufacturing. [Means for solving the problem]

[0006] The tower leg of the first aspect can form part of the steel frame leg of the tower and has a metal main body extending in a predetermined direction, and a plate-shaped metal base that is penetrated in the predetermined direction and has a through-hole formed in which the end of the main body is fitted in the predetermined direction.

[0007] The tower leg of the first aspect comprises a metal main body extending in a predetermined direction and a plate-shaped metal base, and is capable of forming part of the steel frame leg of the tower.

[0008] The main body and base are made of metal, and can be joined by welding, but welding these together may cause welding distortion in the tower legs.

[0009] In this embodiment, a through-hole is formed in the base portion, penetrating the base portion in a predetermined direction, and the end of the main body portion is fitted into this through-hole in the predetermined direction. Therefore, in this embodiment, the main body portion and the base portion can be integrated without being joined by welding.

[0010] The tower leg of the second aspect is the tower leg of the first aspect, wherein the main body is made of angle steel extending in the specified direction, the base is made of flat steel, and the penetration portion is V-shaped to fit the main body when viewed from the specified direction.

[0011] According to the tower leg of the second aspect, the main body is made of angle irons extending in a predetermined direction, and space can be secured to attach various parts to the main body.

[0012] In addition, the base is made of flat steel, and the through-hole formed in the base is V-shaped so that the main body fits in when viewed from a specific direction, allowing the main body and base to be connected in a stable state.

[0013] The tower leg of the third aspect is the tower leg of the first or second aspect, wherein the end face of the end portion is parallel to the underside of the base portion.

[0014] According to the tower leg of the third aspect, the end face of the end of the main body that is fitted into the penetration part of the base is parallel to the underside of the base. Therefore, in this aspect, the main body and the base can be positioned based on the relative relationship between the end face of the main body and the underside of the base.

[0015] The tower leg of the fourth aspect is a tower leg of the second aspect or a third aspect that cites the second aspect, further comprising a support plate that can be attached to the main body, and the support plate is configured to include an attachment piece portion attached to the main body with a fastening material and an extension piece portion extending from the attachment piece portion to the opposite side of the main body.

[0016] According to the tower leg of the fourth aspect, a support plate is attached to the main body, and this support plate includes an attachment piece and an extension piece. The attachment piece is attached to the main body with a fastening material, and in this aspect, the support plate can be fixed to the main body without welding the support plate to the main body.

[0017] In addition, the extension piece extends from the mounting piece to the opposite side of the main body, and can transmit pull-out loads and the like acting on the tower to the main body.

[0018] The tower leg of the fifth aspect is a tower leg of any one of the first to fourth aspects, in which the main body is plated except for the portion that engages with the penetration portion.

[0019] According to the tower leg of the fifth aspect, as described above, the end of the main body is fitted in the penetration part of the base in a predetermined direction.

[0020] However, if plating is performed after the main body and base are integrated, it is possible that deformation will occur in the tower legs due to the heat generated during the plating process.

[0021] In this embodiment, the main body is plated except for the fitting portion with the penetration portion of the base. Therefore, in this embodiment, the main body and the base can be combined in a plated state, and as a result, deformation of the tower legs due to heat during the plating process can be suppressed.

[0022] The tower leg of the sixth aspect is a tower leg of any one of the first to fifth aspects, in which an insert member is attached to the base, and the insert member has a shaft portion that is partially fastened to the base and extends from the upper surface of the base.

[0023] According to the sixth aspect of the tower leg, an insert member is attached to the base, and this insert member has a shaft portion that is partially fastened to the base and extends from the upper surface of the base.

[0024] Therefore, in this aspect, the insert member can be attached to the base without welding the insert member to the base.

[0025] In addition, in this embodiment, in a configuration in which precast concrete is placed on the base side of the tower leg, the shaft portion of the insert member can be embedded in the precast concrete, thereby preventing the precast concrete from detaching from the tower leg.

[0026] The manufacturing method of a steel tower leg according to the seventh aspect involves forming a penetration portion that penetrates a plate-shaped metal base, which can form part of a steel frame leg of a steel tower, in a predetermined direction that is inclined relative to the plate thickness direction of the base, and fitting an end of a metal main body that can form part of the steel frame leg and extends in the predetermined direction into the penetration portion.

[0027] According to the seventh aspect of the manufacturing method for a steel tower leg, a penetration portion is formed in a metal base that can form part of the steel frame leg of a steel tower and is plate-shaped, and that penetrates the base in a predetermined direction that is inclined with respect to the plate thickness direction of the base.

[0028] The end of the metal main body, which can form part of the steel frame leg and extends in the predetermined direction, is fitted into the through-hole in the base, so that in this embodiment, the main body and the base can be integrated without being joined by welding. [Effects of the Invention]

[0029] As described above, the steel tower leg and the method for manufacturing the steel tower leg according to the present invention have the excellent effect of suppressing the occurrence of distortion caused by heat during manufacturing. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 2 is a side view schematically showing the configuration of the leg material of the steel tower foundation according to the present embodiment. [Figure 2] 2 is a bottom view (view taken in the direction of arrow 2 in FIG. 1) schematically showing the configuration of a leg member of a steel tower foundation according to the present embodiment. [Figure 3] 3 is a cross-sectional view (a cross-sectional view showing a state cut along line 3-3 in FIG. 2) schematically showing the configuration of the base of the leg member of the steel tower foundation according to the present embodiment. FIG. [Figure 4] FIG. 1 is a rear view schematically showing the configuration of the inner piece of the tower foundation according to this embodiment. [Figure 5] FIG. 1 is a plan view schematically showing the configuration of a steel tower foundation according to this embodiment. [Figure 6] FIG. 1 is a side view schematically showing the configuration of a steel tower according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, an example of an embodiment of a steel tower base and a method for manufacturing a steel tower base according to the present invention will be described with reference to Figs.

[0032] As shown in Figure 6, the "tower 10" according to this embodiment is configured to include a plurality of main pillar members 12, a plurality of horizontal members 14, a plurality of diagonal members 16, and a plurality of auxiliary members 18 for the main pillar members that are bridged between the main pillar members 12 and the diagonal members 16, and is equipped with four "steel frame legs 20." Note that, hereinafter, unless otherwise specified, the height direction of the tower 10 will be simply referred to as the height direction. Furthermore, the height direction of the tower 10 coincides with the vertical direction.

[0033] 5, a "leg member 22" as a steel tower leg that constitutes part of the steel frame leg 20 is supported on the installation ground 26 via a foundation 24. This foundation 24 is composed of an inner piece 28, a pair of piles 30, a rectangular parallelepiped floor plate 32 that constitutes the main part of the foundation 24, and a column-constituting piece 34.

[0034] Note that arrow X, as shown appropriately in each drawing, indicates one side in the length direction of the foundation 24, arrow Y indicates one side in the width direction of the foundation 24 that is perpendicular to the length direction of the foundation 24, and arrow Z indicates the upper side in the height direction. Furthermore, these directions are used for convenience of explanation and do not absolutely define the posture, etc., of the foundation 24 when installed. Furthermore, hereinafter, unless otherwise specified, the length direction of the foundation 24 will be simply referred to as the length direction, and the width direction of the foundation 24 will be simply referred to as the width direction.

[0035] As shown in Fig. 4, the inner piece 28 is provided integrally with the lower end 22A in the height direction of the leg member 22. The inner piece 28 is made of precast concrete and is configured in the shape of a rectangular pillar extending in the height direction.

[0036] More specifically, the inner piece 28 has an octagonal shape with the four corners of a square cut off into isosceles triangles when viewed from the height direction, and has a plurality of recesses 36 formed on its outer circumferential surface 28A. When viewed from the height direction, the recesses 36 are formed in an annular shape along the circumferential direction of the outer circumferential surface 28A, and a plurality of recesses 36 are arranged in the height direction. The inner piece 28 is placed on the bottom of an excavation hole (not shown) that is formed by excavating the installation ground 26 and that accommodates the main portion of the foundation 24. Concrete 56 is poured around the inner piece 28.

[0037] Next, we will explain the configuration of the leg member 22. As shown in Figure 1, the leg member 22 is configured to include a "main body portion 38" made of angle iron and a "base portion 40" made of flat steel.

[0038] More specifically, the main body 38 extends in a predetermined direction (hereinafter simply referred to as the predetermined direction) inclined at a predetermined angle θ with respect to the height direction, and a plurality of through holes 42 are formed in the upper part in the height direction to which the components of the steel frame leg 20 are connected. On the other hand, the lower part in the height direction of the main body 38 is embedded in the inner piece 28.

[0039] As also shown in Figure 4, a plurality of "support plates 44" made of angle iron are attached along a predetermined direction to each of the front surface 38A1 and back surface 38A2 of the pair of flange portions 38A that make up the main body portion 38.

[0040] This support plate 44 is composed of an "attachment piece portion 44A" which is a rectangular plate when viewed from the plate thickness direction of the flange portion 38A, and an "extension piece portion 44B" which extends from the lower peripheral portion of the attachment piece portion 44A in the height direction to the opposite side of the main body portion 38 and is a rectangular plate when viewed from a predetermined direction.

[0041] Then, with the flange portion 38A sandwiched between the mounting piece portion 44A of the support plate 44 on the front surface 38A1 side and the mounting piece portion 44A of the support plate 44 on the back surface 38A2 side, the flange portion 38A and the pair of mounting piece portions 44A are fastened together with "bolts 46" and "nuts 48" as fastening materials.

[0042] On the other hand, as shown in Figures 2 and 3, the base 40 is shaped like a regular octagonal plate when viewed from the height direction, and is formed with a "penetration portion 50" into which the "end portion 38B" on the lower height side of the main body portion 38 is fitted, and an attachment hole portion 54 into which the "insert member 52" is attached.

[0043] Specifically, the through-hole 50 is formed by fusing a portion of the base 40 by laser processing to penetrate the base 40 in a predetermined direction, and has a V-shape when viewed from the predetermined direction to accommodate the main body 38. When the end 38B is fitted into the through-hole 50, the "end surface 38B1" of the end 38B is parallel to the "bottom surface 40A" of the base 40.

[0044] On the other hand, the mounting hole 54 has an upper portion in the height direction that is a female thread portion 54A, and a lower portion in the height direction that is a countersunk portion 54B.

[0045] 3, the insert member 52 is a so-called flat head bolt having a truncated conical head 52A that fits into the countersunk portion 54B and a “shank 52B” that can be fastened to the female thread portion 54A. The shank 52B extends upward in the height direction from the “upper surface 40B” of the base 40, and its main portion is embedded in the inner piece 28.

[0046] The main body 38 is also hot-dip galvanized except for the portion where it fits into the through-hole 50 of the base 40 .

[0047] As shown in Figure 5, the piles 30 are made of cylindrical steel pipes extending in the vertical direction, and are arranged on the vertical lower side of one longitudinal side of the floor plate 32 and on the vertical lower side of the other longitudinal side of the floor plate 32.

[0048] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0049] In this embodiment, as shown in Figure 1, the leg member 22 comprises a metal main body 38 extending in a predetermined direction and a plate-shaped metal base 40, and is capable of forming part of the steel frame leg 20 of the steel tower 10.

[0050] Incidentally, the main body portion 38 and the base portion 40 are made of metal, and it is possible to join the main body portion 38 and the base portion 40 by welding, but if these are joined by welding, it is thought that welding distortion will occur in the leg material 22.

[0051] 2 and 3, in this embodiment, a through-hole 50 is formed in the base 40, penetrating the base 40 in a predetermined direction, and the end 38B of the main body 38 is fitted in a predetermined direction into this through-hole 50. Therefore, in this embodiment, the main body 38 and the base 40 can be integrated without being joined by welding.

[0052] In this embodiment, as shown in FIG. 1, the main body 38 is made of angle irons extending in a predetermined direction, and space for attaching various components to the main body 38 can be secured.

[0053] Specifically, a support plate 44 is attached to the main body 38, and this support plate 44 is configured to include an attachment piece portion 44A and an extension piece portion 44B. The attachment piece portion 44A is attached to the main body 38 with a bolt 46 and a nut 48, and in this embodiment, the support plate 44 can be fixed to the main body 38 without welding the support plate 44 to the main body 38.

[0054] In addition, the extension piece portion 44B extends from the mounting piece portion 44A to the opposite side of the main body portion 38, and can transmit the pulling load acting on the steel tower 10, etc. to the main body portion 38.

[0055] Also, as shown in Figure 3, in this embodiment, the base 40 is made of flat steel, and the through-hole 50 formed in the base 40 is V-shaped so that the main body 38 fits inside when viewed from a predetermined direction, allowing the main body 38 and the base 40 to be connected in a stable state.

[0056] Furthermore, in this embodiment, in the main body 38, the end surface 38B1 of the end portion 38B fitted into the through-hole 50 of the base 40 is parallel to the lower surface 40A of the base 40. Therefore, in this embodiment, the main body 38 and the base 40 can be positioned based on the relative relationship between the end surface 38B1 of the main body 38 and the lower surface 40A1 of the base 40.

[0057] In addition, in this embodiment, the main body 38 is plated except for the fitting portion with the through-hole 50 of the base 40. Therefore, in this embodiment, the main body 38 in a plated state can be combined with the base 40, and as a result, deformation of the leg member 22 due to heat during the plating process can be suppressed.

[0058] In addition, in this embodiment, as shown in Figure 1, an insert member 52 is attached to the base 40, and this insert member 52 has a portion fastened to the base 40 and an axial portion 52B extending from the upper surface 40B of the base 40.

[0059] Therefore, in this embodiment, the insert member 52 can be attached to the base 40 without welding the insert member 52 to the base 40.

[0060] In addition, in this embodiment, as shown in Figure 4, in a configuration in which an inner piece 28 made of precast concrete is placed on the base 40 side of the leg material 22, the shaft portion 52B of the insert member 52 can be embedded in the inner piece 28, thereby preventing the inner piece 28 from detaching from the leg material 22.

[0061] Next, a method for manufacturing a steel tower leg according to this embodiment will be described.

[0062] In the manufacturing method of the steel tower leg according to this embodiment, as shown in Figure 3, in the first step, flat steel is cut into a predetermined shape by laser processing to form the base 40, and a penetration portion 50 is formed in the base 40 in a predetermined direction inclined with respect to the thickness direction of the base 40.

[0063] Next, as shown in FIG. 1, in the second step, the angle iron is subjected to laser processing to form the main body portion 38.

[0064] Next, in the third step, the main body 38 is subjected to hot dip galvanization except for the fitting portion with the through portion 50 of the base 40 .

[0065] Next, in a fourth step, the end portion 38B of the main body portion 38 is fitted into the through portion 50 of the base portion 40.

[0066] Next, in a fifth step, the support plate 44 is attached to the main body 38, and the insert member 52 is attached to the base 40. Therefore, in this embodiment, the main body 38 and the base 40 can be integrated without being joined by welding.

[0067] As described above, in this embodiment, it is possible to prevent the occurrence of distortion in the leg member 22 due to heat during manufacturing.

[0068] <Supplementary explanation of the above embodiment> (1) In the above-described embodiment, the main body 38 is made of angle iron, but the main body 38 may be made of a circular steel pipe. Furthermore, when such a configuration is adopted, the shape of the penetration portion 50 formed in the base 40 may be elliptical.

[0069] (2) In addition, in the above-described embodiment, the insert member 52 is a flat head bolt. However, it is also possible to use a Y-insert in which the tip end of the shaft portion 52B is branched. [Explanation of symbols]

[0070] 10. Steel Tower 20 Steel frame base 22 Leg material (tower leg) 38 Main body 38B End 38B1 End face 40 base 40A bottom 40B top surface 44 Bearing Plate 44A Mounting piece 44B Extension piece 46 Bolts (fastening members) 48 Nut (fastening member) 50 Penetration 52 Insert member 52B Shaft

Claims

1. It can be used to form part of the steel legs of a steel tower. a metal body portion extending in a predetermined direction; a plate-shaped metal base portion having a through-portion that penetrates in the predetermined direction and into which an end of the main body portion is fitted in the predetermined direction; and The end portion is fitted into the through-hole, thereby positioning the main body portion and the base portion without welding. Tower legs.

2. The main body portion is composed of angle irons extending in the predetermined direction, The base is made of flat steel, and The through-hole portion is V-shaped when viewed from the predetermined direction so that the main body portion fits therein. The tower leg according to claim 1.

3. The end surface of the end portion is parallel to the lower surface of the base portion. The tower leg according to claim 1.

4. Further provided is a support plate that can be attached to the main body portion, The support plate is configured to include an attachment piece portion attached to the main body portion with a fastening material, and an extension piece portion extending from the attachment piece portion to the opposite side of the main body portion. The tower leg according to claim 2.

5. The main body is plated except for the portion that is fitted with the through-hole. The tower leg according to claim 1.

6. an insert member attached to the base; The insert member has a portion fastened to the base and includes a shaft portion extending from an upper surface of the base. The tower leg according to claim 1.

7. A through-hole is formed in a metal base plate that can constitute a part of a steel frame leg of a steel tower and that penetrates the base plate in a predetermined direction that is inclined with respect to the plate thickness direction of the base plate, an end of a metal main body portion that can constitute a part of the steel frame leg portion and extends in the predetermined direction is fitted into the through-hole, thereby positioning the main body portion and the base without welding; Manufacturing method for steel tower legs.

Images