Reinforcement structure for tower foundation

Abstract

To provide a reinforcement structure for a steel tower foundation allowing damage on a mat foundation to be prevented.SOLUTION: A reinforcement structure for a steel tower foundation 1 where respective anchoring members 4 are fixed on main leg members 2 of the steel tower and the main leg members 2 with the respective anchoring members 4 are buried in a mat foundation 7. In this invention, a pair of the anchoring members 4 are fixed on the main leg member 2 though attachment plates 3 so that a shape in a plan view from an upper direction to a lower direction of the steel power forms a generally L-shape. A pair of reinforcement members 5, 5 and opposite side members 6 adjacent to each other forms a truss structure through connecting the pair of reinforcement members 5, 5 and opposite side members 6 adjacent as adjacent anchoring members 4, 4 of the main leg members 2 of the four placed main leg members 2 adjacent to each other are connected with the reinforcement member 5 to be integrated.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] This invention relates to a reinforcing structure for a steel tower foundation in which the main leg members of the steel tower are fixed to a mat foundation with anchor members. [Background technology]

[0002] Traditionally, transmission line towers have been designed to have anchors fixed to their main legs, which are then embedded in a mat foundation together with the anchors to reliably transmit the load acting from the top of the tower (loads due to the tower's own weight, the electric wires' own weight, the tension of the electric wires, wind force, etc.) to the mat foundation, and the anchors are also used to prevent the main legs from coming out of the mat foundation due to tensile loads (see Patent Document 1).

[0003] In cases where the transit site (the location where the tower is to be erected) of such a transmission line tower is in an urban area or the like and the area of ​​land for tower construction is limited, making it impossible to secure a sufficient installation area for the mat foundation, it is possible to reduce the installation area of ​​the mat foundation by changing the piles 101, 102 arranged in a T-shape as shown in Figure 4(a) to piles 101, 101 arranged in an L-shape as shown in Figure 4(b). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3776408 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as shown in Figure 5(a), in a transmission line tower, the main leg material 103 is inclined (not vertical) relative to the installation surface (horizontal plane) 105 of the mat foundation 104, so when a compressive load from the tower acts on the main leg material 103, a force (the horizontal component of the compressive load from the tower) acts in a direction that spreads the lower end portion 103a of the main leg material 103 outward (in a direction that brings it closer to the edge 104a of the mat foundation 104), and if the dimension from the main leg material 103 to the edge 104a of the mat foundation 104 is not sufficiently secured, there is a risk of damage (e.g., cracks) occurring to the mat foundation 104.

[0006] Therefore, an object of the present invention is to provide a reinforcement structure for a tower foundation that can prevent damage to the mat foundation. [Means for solving the problem]

[0007] The present invention is 4 places Anchor members 4 are fixed to each of the main landing gear members 2, 4 places Main landing gear 2 Bottom end of together with the anchor material 4 Collectively The present invention relates to a reinforcing structure for a steel tower foundation 1 embedded in a mat foundation 7. In the present invention, the anchor members 4 are fixed in pairs to the main leg members 2 via mounting plates 3 so that the shape of the anchor members 4 when viewed in a plan view from the top to the bottom of the steel tower is a substantially L-shape. In addition, adjacent anchor members 4, 4 of adjacent main leg members 2 among the four main leg members 2 are connected and integrated with a reinforcing member 5, and adjacent pairs of reinforcing members 5, 5 are connected with an opposite side member 6, so that the adjacent pairs of reinforcing members 5, 5 and the opposite side member 6 form a truss structure. The anchor member 4, the mounting plate 3, the reinforcing member 5, and the opposing member 6 are entirely embedded in the mat base 7. It is characterized by the following. Effect of the Invention

[0008] The reinforcement structure for the tower foundation of the present invention can prevent the main leg material from displacing outward by using a truss structure formed by a pair of adjacent reinforcing materials and the opposing side material, so that damage to the mat foundation can be suppressed even if the dimension from the main leg material to the edge of the mat foundation cannot be sufficiently secured. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a front view showing a reinforcement structure for a steel tower foundation according to an embodiment of the present invention. [Diagram 2] FIG. 2(a) is a plan view showing a reinforcing structure for a steel tower foundation according to an embodiment of the present invention, and FIG. 2(b) is a plan view showing a reinforcing structure for a steel tower foundation according to a modified example of FIG. 2(a). [Diagram 3] FIG. 3(a) is a plan view of the mat foundation, and FIG. 3(b) is a front view of the mat foundation. [Figure 4] FIG. 4(a) is a plan view showing anchor members arranged in a T-shape, and FIG. 4(b) is a plan view showing anchor members arranged in a substantially L-shape. [Diagram 5] FIG. 5(a) is a diagram showing the load acting on the main landing gear, and FIG. 5(b) is a diagram showing a schematic diagram of a case in which damage occurs to the mat foundation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0011] Fig. 1 is a front view showing a reinforcement structure for a tower foundation 1 according to an embodiment of the present invention. Fig. 2(a) is a plan view showing a reinforcement structure for a tower foundation 1 according to an embodiment of the present invention. Fig. 2(a) is a plan view showing approximately half of the tower foundation 1, with the other half of the tower foundation 1, which has a similar structure, omitted.

[0012] As shown in these figures, the main landing gear 2, which is fixed to the lower end of each of the four main pillars of the tower, is an angle iron with an L-shaped cross section, and a mounting plate 3 is fixed to each side with multiple bolts. Anchor material 4 is fixed to the mounting plate 3 with multiple bolts. That is, when viewed in a plan view from the top to the bottom of the tower, a pair of anchor materials 4, 4 are fixed to the main landing gear 2 via the mounting plate 3 so as to form a substantially L-shape (see FIG. 2(a)). The mounting plate 3 is a flat plate (steel plate), and the anchor material 4 is an angle iron.

[0013] Adjacent anchor members 4,4 of adjacent main landing gear members 2 out of the four main landing gear members 2 are connected and integrated by a reinforcing member 5. The reinforcing member 5 is an angle iron extending linearly from one anchor member 4 to the other anchor member 4, with one end in the longitudinal direction fixed to one of the pair of anchor members 4,4 by a bolt and the other end in the longitudinal direction fixed to the other of the pair of anchor members 4,4 by a bolt.

[0014] A pair of adjacent reinforcing members 5, 5, which are perpendicular to each other, has the end of the opposite side member 6 fixed by a bolt at the longitudinal center, forming a right-angled isosceles triangle with the opposite side member 6. That is, a truss structure is formed at the four corners of the tower foundation 1 by the pair of adjacent reinforcing members 5, 5 and the opposite side member 6. A part of the main leg member 2, the mounting plate 3, the anchor member 4, the reinforcing member 5, and the opposite side member 6 are embedded in the mat foundation 7 as shown in Figure 1. In Figure 1, the mat foundation 7 is shown diagrammatically by phantom lines to clarify the internal structure.

[0015] FIG. 3 shows a mat foundation 7. This mat foundation 7 is a plate-like body with a square planar shape, with pile body main reinforcing bars 8 arranged at each of the four corners, and a main leg member rising portion 11 is formed between each pile body main reinforcing bar 8 and the corner end portion 10. The main leg member rising portion 11 of this mat foundation 7 is configured so that the other portion of the main leg member 2, part of which is buried inside the mat foundation 7, protrudes diagonally upward (along the extension direction of the main column material of the steel tower) (see FIG. 1). In this mat foundation 7, the opposite side material 6 is arranged at a position that does not interfere with the pile body main reinforcing bars 8 (see FIG. 2(a)). The pile body main reinforcing bars 8 have their upper ends fixed inside the mat foundation 7, and their other portions driven into the ground 12. A part of the mat foundation 7 is buried in the ground 12.

[0016] Fig. 2(b) is a plan view showing a reinforcing structure of a steel tower foundation 1 according to a modified example of the above embodiment. As shown in Fig. 2(b), when the opposing member 6 connecting the middle parts of the adjacent reinforcing members 5, 5 interferes with the pile main reinforcing bar 8, the opposing member 6 is arranged outside the pile main reinforcing bar 8 (between the pile main reinforcing bar 8 and the main leg member 2) and at a position where it does not interfere with the pile main reinforcing bar 8.

[0017] According to the reinforcement structure of the tower foundation 1 in this embodiment as described above, even if the load from the tower acts on the main leg material 2, the truss structure formed by a pair of adjacent reinforcing materials 5, 5 and the opposing member 6 connecting these reinforcing materials 5, 5 can suppress displacement of the main leg material 2 to the outside (towards each corner end 10 of the mat foundation 7), so that even if the dimension from the main leg material 2 to the edge 7a of the mat foundation 7 cannot be sufficiently secured, damage to the mat foundation 7 can be suppressed. [Explanation of symbols]

[0018] 1... Tower foundation, 2... Main landing gear, 3... Mounting plate, 4... Anchor, 5... Reinforcement, 6... Opposite side material, 7... Mat foundation

Claims

[Claim 1] In a reinforcement structure for a steel tower foundation, an anchor member is fixed to each of four main leg members of a steel tower, and the lower ends of the four main leg members are embedded together with the anchor members into a mat foundation, The anchor members are fixed to the main landing gear members via mounting plates in pairs so that the shape of the anchor members when viewed from above to below the tower is approximately L-shaped, The anchor members of adjacent main landing gear members among the four main landing gear members are connected to each other by a reinforcing material to be integrated together, A pair of adjacent reinforcing members are connected by a pair of opposite sides, so that the pair of adjacent reinforcing members and the pair of opposite sides form a truss structure, The anchor member, the mounting plate, the reinforcing member, and the opposing member are entirely embedded in the mat base. A reinforcement structure for a steel tower foundation.

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