Steel tower foundation structure

Abstract

To provide a steel tower foundation structure which shortens a construction time required for constructing a steel tower foundation, while securing a weight of the steel tower foundation, and can secure sheared areas of the steel tower foundation and the installation ground.SOLUTION: A steel tower foundation 10 includes a central floor plate part 46 which is mainly composed of precast concrete, wherein the central floor plate part 46 has a rectangle shape when being viewed from a height direction. An additional floor plate part 48 which has a rectangle shape when being viewed from the height direction and is mainly composed of precast concrete is arranged adjacently to the central floor plate part 46 in a direction perpendicular to the height direction, and is connected to the central floor plate part 46.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tower foundation structure. [Background technology]

[0002] Patent Document 1 below describes an invention related to a steel tower foundation structure. In this steel tower foundation structure, a precast concrete outer piece is arranged to surround a leg member that constitutes part of the steel frame leg of the steel tower, and the leg member is supported by this outer piece. Therefore, even if a pull-out load caused by electric wires suspended from the steel tower is applied to the leg member, the outer piece can support this pull-out load. In addition, construction time can be shortened compared to when the outer piece is constructed by pouring concrete on-site. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6650995 (Figure 1) Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned prior art, the cylindrical outer pieces are stacked in the height direction of the tower to apply a load to the legs in the height direction of the tower. However, when using precast concrete members of the same mass, it is easier to ensure the contact area between the member and the installation ground, i.e., the shear cross-sectional area, with a member with a square outer periphery than with a member with a circular outer periphery as viewed in the height direction of the tower. In addition, in order to dig a circular hole in the installation ground as viewed in the height direction of the tower, the hole wall needs to be shaped manually, which is considered to increase the construction time.

[0005] In consideration of the above-mentioned facts, the present invention aims to provide a tower foundation structure that can shorten the construction time required to construct a tower foundation while ensuring the weight of the tower foundation, and further ensure the shear cross-sectional area between the tower foundation and the installation ground. [Means for solving the problem]

[0006] The tower foundation structure of the first aspect comprises a leg member constituting part of the steel leg of the tower, an inner piece made of precast concrete integrally attached to the lower end of the leg member in the height direction of the tower, a central floor plate section having a square shape when viewed from the height direction, an inner penetration section surrounding the inner piece, and a main part made of precast concrete, an inner intervening section made of concrete interposed between the inner piece and the inner surface of the inner penetration section, and an additional floor plate section arranged adjacent to the central floor plate section in a direction perpendicular to the height direction, having a square shape when viewed from the height direction, a main part made of precast concrete, and connected to the central floor plate section.

[0007] According to the tower foundation structure of the structure of the first aspect, the inner piece is integrally formed with the lower end of the leg member that constitutes part of the steel frame leg of the tower in the height direction of the tower (hereinafter simply referred to as the height direction).

[0008] In this embodiment, the main part of the central floor panel is made of precast concrete, and the central floor panel has an inner penetration part surrounding the inner piece when viewed from the height direction. An inner intermediate part made of concrete is interposed between the inner piece and the inner peripheral surface of the inner penetration part.

[0009] Therefore, in this embodiment, even if a pull-out load caused by electric wires suspended from the steel tower acts on the legs, the weight of the central floor plate can support this pull-out load. Moreover, the time required for curing the concrete can be shortened compared to when the central floor plate is constructed by pouring concrete on-site.

[0010] Incidentally, when it is considered that a large pull-out load will act on the legs, it is possible to add a precast concrete member to the central floor plate to apply a load downward in the height direction to the legs. For example, by stacking precast concrete members in the height direction on the central floor plate, it is possible to apply a load downward in the height direction of the tower to the legs.

[0011] Specifically, one example of such a configuration is one in which the main part of the central floor panel is made of cylindrical precast concrete, and components made of cylindrical precast concrete are stacked vertically above the central floor panel.

[0012] However, when using precast concrete members of the same mass, it is easier to secure the contact area between the member and the installation ground, i.e., the shear cross-sectional area, with a member with a square perimeter than with a member with a circular perimeter when viewed from the height direction. Also, in order to dig a circular hole in the installation ground when viewed from the height direction of the steel tower, the hole wall needs to be shaped manually, which is thought to increase the construction time.

[0013] In this embodiment, the central floor panel is rectangular when viewed from the height direction. The additional floor panel, which is rectangular when viewed from the height direction and whose main portion is made of precast concrete, is disposed adjacent to the central floor panel in a direction perpendicular to the height direction and is connected to the central floor panel.

[0014] Therefore, in this embodiment, the central and additional floor plates can apply a load to the legs downward in the height direction. Also, compared to when the central and additional floor plates are made of precast concrete with a circular periphery when viewed in the height direction, it is easier to ensure the shear area between the central and additional floor plates and the installation ground, and the excavation time required to excavate holes in the installation ground to install the central and additional floor plates can be reduced.

[0015] The tower foundation structure of the second aspect is the tower foundation structure of the first aspect, wherein the central floor plate portion includes an upper central floor plate block constituting the upper part in the height direction and a lower central floor plate block constituting the lower part in the height direction, and further includes a plurality of main reinforcing bars that extend in the height direction and are arranged in a row along the circumferential direction of the inner penetration portion that penetrates the upper central floor plate block and the lower central floor plate block when viewed from the height direction, and are embedded in the inner interposed portion.

[0016] According to the tower foundation structure of the second aspect, the central floor plate section is configured to include an upper central floor plate block constituting the upper part in the height direction and a lower central floor plate block constituting the lower part in the height direction. Therefore, in this aspect, when the central floor plate section is transported to the construction site, the central floor plate section can be transported by dividing it into the upper central floor plate block and the lower central floor plate block.

[0017] However, if the central floor panel is constructed by simply stacking an upper central floor panel block and a lower central floor panel block, the load acting on the legs, such as a pull-out load, will act on the upper central floor panel block and the lower central floor panel block independently, making it difficult for the entire central floor panel block to support the bending moment caused by this load.

[0018] In this embodiment, the inner penetration portion penetrates the upper central floor plate block and the lower central floor plate block. A plurality of main reinforcing bars extending in the height direction are embedded in the inner interposed portion, and these main reinforcing bars are arranged in a row along the circumferential direction of the inner penetration portion when viewed in the height direction.

[0019] Therefore, in this embodiment, multiple main reinforcing bars connect the upper central floor panel block and the lower central floor panel block via the inner interposition part, and as a result, the bending moment caused by the load acting on the central floor panel portion can be supported by the entire central floor panel portion.

[0020] The tower foundation structure of the third aspect is the tower foundation structure of the second aspect, wherein the additional deck plate section is configured to include an upper additional deck plate block that constitutes the upper part in the height direction and a lower additional deck plate block that constitutes the lower part in the height direction, and further has a first limiting section that limits the relative displacement between the upper additional deck plate block and the lower additional deck plate block in the connection direction between the central deck plate section and the additional deck plate section, and a second limiting section that limits the relative displacement between the upper additional deck plate block and the lower additional deck plate block in the height direction.

[0021] According to the tower foundation structure of the third aspect, the additional deck section is configured to include an upper additional deck block constituting the upper part in the height direction and a lower additional deck block constituting the lower part in the height direction. Therefore, in this aspect, when the additional deck section is transported to the construction site, the additional deck section can be transported by dividing it into the upper additional deck block and the lower additional deck block.

[0022] Incidentally, it is considered that a bending moment due to an external force acting from the central floor plate portion will be generated in the additional floor plate portion. If the bending moment is generated in the additional floor plate portion while the relative displacement between the upper and lower additional floor plate blocks is not restricted, slippage will occur between the upper and lower additional floor plate blocks, making it difficult for the entire additional floor plate portion to support the bending moment.

[0023] Here, in this embodiment, a first limiting part is provided that limits the relative displacement between the upper and lower additional floor plate blocks in the connecting direction between the central floor plate part and the additional floor plate part, and a second limiting part is provided that limits the relative displacement between the upper and lower additional floor plate blocks in the height direction. Therefore, when the bending moment occurs in the additional floor plate part, slippage between the upper and lower additional floor plate blocks is suppressed, and the entire additional floor plate part can support the bending moment.

[0024] The tower foundation structure according to the fourth aspect is a tower foundation structure according to the third aspect, further comprising a first upper reinforcing bar, the main part of which is embedded in the upper central floor block and a part of which is extended from the upper part of the upper central floor block in the height direction to the upper additional floor block side, a first lower reinforcing bar, the main part of which is embedded in the lower central floor block and a part of which is extended from the lower part of the lower central floor block in the height direction to the lower additional floor block side, and a second lower reinforcing bar, the main part of which is embedded in the lower central floor block and a part of which is extended from the lower part of the lower central floor block in the height direction to the lower additional floor block side. the first upper reinforcement and the second upper reinforcement, the main part of which is embedded in the lower additional floor block and the part of which extends from the upper part of the upper additional floor block in the height direction toward the upper central floor block; a second lower reinforcement, the main part of which is embedded in the lower additional floor block and the part of which extends from the lower part of the lower additional floor block in the height direction toward the lower central floor block; a first joint portion connecting the first upper reinforcement and the second upper reinforcement; and a second joint portion connecting the first lower reinforcement and the second lower reinforcement.

[0025] According to the tower foundation structure of the fourth aspect, the main part of the first upper reinforcement bar is embedded in the upper central deck block, and a part of the first upper reinforcement bar extends from the upper part of the upper central deck block in the height direction toward the upper additional deck block.

[0026] On the other hand, the main part of the second upper reinforcement is embedded in the upper additional floor block, and a part of the second upper reinforcement extends from the upper part of the upper additional floor block in the height direction toward the upper central floor block. The first upper reinforcement and the second upper reinforcement are connected at the first joint.

[0027] In addition, the main part of the first lower reinforcement is embedded in the lower central floor block, and a part of the first lower reinforcement extends from the lower part of the lower central floor block in the height direction toward the lower additional floor block.

[0028] On the other hand, the main part of the second lower reinforcement is embedded in the lower additional slab block, and a part of the second lower reinforcement extends from the lower part of the lower additional slab block in the height direction toward the lower center slab block. The first lower reinforcement and the second lower reinforcement are connected by a second joint.

[0029] Therefore, in this embodiment, the bending moment caused by pull-out loads, etc. acting on the leg material can be supported by the upper height portions of the upper central floor block and upper additional floor block, where the effect of the bending moment tends to be greater, and the lower height portions of the lower central floor block and lower additional floor block.

[0030] The tower foundation structure of the fifth aspect is the tower foundation structure of the fourth aspect, further comprising a lower intermediate block that is arranged between the lower central deck block and the lower additional deck block and has a groove portion formed therein into which the second joint portion fits from below in the height direction.

[0031] According to the tower foundation structure of the fifth aspect, as described above, the first lower reinforcement extending from the lower height portion of the lower central deck block and the second lower reinforcement extending from the lower height portion of the lower additional deck block are connected at the second joint portion.

[0032] However, depending on the height dimensions of the lower central floor panel block and the lower additional floor panel block, it may be difficult to confirm the connection state of the first lower reinforcement bar and the second lower reinforcement bar at the second joint portion.

[0033] On the other hand, if the lower central floor block and the lower additional floor block are separated to check the above-mentioned connection state, it will be necessary to fill the gap between the lower central floor block and the lower additional floor block with mortar or the like.

[0034] Here, in this embodiment, a lower intermediate block is provided, and this lower intermediate block is disposed between the lower center floor plate block and the lower additional floor plate block. Also, the lower intermediate block is formed with a groove portion into which the second joint portion fits from below in the height direction.

[0035] Therefore, in this embodiment, a gap is secured between the lower central deck block and the lower additional deck block to accommodate the lower intermediate block, and the connection state of the first lower reinforcement and the second lower reinforcement at the second joint portion can be confirmed through this gap.

[0036] In addition, after confirming the above-mentioned connection state, a lower intermediate block can be placed between the lower central floor block and the lower additional floor block so that the second joint part fits into the groove, thereby filling the space between the lower central floor block and the lower additional floor block with a lower intermediate block.

[0037] The tower foundation structure of the sixth aspect is the tower foundation structure of the fifth aspect, wherein the first limiting portion is provided on the lower surface of the upper additional deck block in the height direction and includes a first protrusion portion extending in a direction perpendicular to the connecting direction, and a second protrusion portion provided on the upper surface of the lower additional deck block in the height direction and extending in a direction perpendicular to the connecting direction and engageable with the first protrusion portion.

[0038] According to the tower foundation structure of the sixth aspect, a first protrusion portion is provided on the lower height surface of the upper additional deck plate block, and this first protrusion portion extends in a direction perpendicular to the connection direction between the central deck plate portion and the additional deck plate portion.

[0039] In addition, a second protrusion is provided on the upper surface in the height direction of the lower additional floor board block, and this second protrusion extends in a direction perpendicular to the above-mentioned connecting direction.

[0040] In this aspect, the first protrusion and the second protrusion are engaged with each other, thereby restricting the relative displacement in the connecting direction between the upper additional floor board block and the lower additional floor board block.

[0041] The seventh aspect of the tower foundation structure is the tower foundation structure of the sixth aspect, wherein the additional deck plate sections are arranged in multiple relative to the central deck plate section, an outer penetration section penetrating the additional deck plate sections in the height direction is formed, and multiple recesses are formed in the inner surface portion of the outer penetration section along the circumferential direction of the outer penetration section, and the tower foundation structure further comprises piles embedded in the installation ground below the additional deck plate sections in the height direction, and the second limiting section includes anchorage bars extending upward in the height direction from the piles and arranged in multiple relative directions along the circumferential direction of the outer penetration section when viewed from the height direction, and an outer intervening section made of concrete filled in the outer penetration section and in which the anchorage bars are embedded.

[0042] According to the tower foundation structure of the seventh aspect, a plurality of additional deck plate sections are arranged relative to a central deck plate section. Also, an outer penetration section is formed penetrating the additional deck plate section in the height direction, and a plurality of recesses are formed on the inner peripheral surface of the outer penetration section along the circumferential direction of the outer penetration section.

[0043] On the other hand, piles are embedded in the installation ground below the additional slab in the height direction, and multiple anchor bars extend from the piles to the upper side in the height direction. These anchor bars are arranged along the circumferential direction of the outer penetration part of the additional slab when viewed from the height direction.

[0044] In this embodiment, the outer intermediate portion is formed by filling the outer penetration portion with concrete, and the outer intermediate portion is provided with a plurality of protrusions that engage with recesses provided on the inner peripheral surface of the outer penetration portion. The outer intermediate portion has anchoring bars embedded therein that extend from the pile.

[0045] Therefore, in this embodiment, the upper and lower additional deck blocks are connected by the anchor bars and the outer interposition parts, and the relative displacement between the upper and lower additional deck blocks is restricted. Therefore, in this embodiment, the entire additional deck section can support the pull-out load acting on the leg member.

[0046] In addition, in this embodiment, the pull-out load acting on the leg member can be supported by multiple piles, so the diameter of the piles can be smaller than when only one pile is used to support this pull-out load.

[0047] As a result, it is possible to drive the piles into the ground using a relatively small pile driver, making it easy to transport the pile driver to the construction site. Effect of the Invention

[0048] As described above, the tower foundation structure of the present invention has the excellent effects of shortening the construction time required to construct the tower foundation while ensuring the weight of the tower foundation, and further ensuring the shear cross-sectional area between the tower foundation and the installation ground. [Brief description of the drawings]

[0049] [Figure 1] FIG. 2 is a perspective view showing a schematic configuration of a tower foundation according to the first embodiment. [Diagram 2] FIG. 2 is a side view showing a schematic configuration of the tower foundation according to the first embodiment. [Diagram 3] FIG. 2 is a plan view showing a schematic configuration of a tower foundation according to the first embodiment. [Figure 4] FIG. 2 is an oblique view showing a schematic configuration of an inner piece of the tower foundation according to the first embodiment. [Diagram 5] FIG. 2 is an oblique view showing a schematic configuration of a leg member of a tower foundation according to the first embodiment. [Figure 6] FIG. 2 is an oblique view showing a schematic configuration of the piles and anchor reinforcement of the steel tower foundation according to the first embodiment. [Figure 7]FIG. 2 is an oblique view showing a schematic configuration of a column constituent piece of a tower foundation according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view (a cross-sectional view showing a state cut along line 8-8 in FIG. 7) that illustrates a schematic configuration of a column constituent piece of the steel tower foundation according to the first embodiment. [Figure 9] FIG. 2 is an oblique view showing a schematic configuration of an upper central floor plate block of a tower foundation according to the first embodiment. [Figure 10] FIG. 2 is a perspective view showing a schematic configuration of a reinforcing bar for reinforcing the upper central floor plate block of the tower foundation according to the first embodiment. [Figure 11] FIG. 11 is a cross-sectional view (a cross-sectional view showing a state cut along line 11-11 in FIG. 9) showing a schematic configuration of an upper central floor plate block of a tower foundation according to the first embodiment. [Figure 12] FIG. 2 is an oblique view showing a schematic configuration of a lower central floor plate block of a tower foundation according to the first embodiment. [Figure 13] FIG. 2 is a perspective view showing a schematic configuration of a reinforcing bar for reinforcing the lower central floor plate block of the tower foundation according to the first embodiment. [Figure 14] FIG. 14 is a cross-sectional view (a cross-sectional view showing a state cut along line 14-14 in FIG. 12) that shows a schematic configuration of an upper central floor plate block of a tower foundation according to the first embodiment. [Figure 15] FIG. 2 is a perspective view showing a schematic configuration of an upper additional deck block of the tower foundation according to the first embodiment. [Figure 16] FIG. 2 is a perspective view showing a schematic configuration of a reinforcing bar for reinforcing an upper additional deck block of a tower foundation according to the first embodiment. [Figure 17] FIG. 17 is a cross-sectional view (a cross-sectional view showing a state cut along line 17-17 in FIG. 15) that shows a schematic configuration of an upper additional deck plate block of the tower foundation according to the first embodiment. [Figure 18] FIG. 2 is a perspective view showing a schematic configuration of a lower additional deck block of the tower foundation according to the first embodiment. [Figure 19] FIG. 2 is a perspective view showing a schematic configuration of a reinforcing bar for reinforcing a lower additional deck block of a tower foundation according to the first embodiment. [Figure 20]FIG. 20 is a cross-sectional view (a cross-sectional view showing a state cut along line 20-20 in FIG. 18) that shows a schematic configuration of a lower additional deck plate block of the tower foundation according to the first embodiment. [Figure 21] FIG. 2 is a side view showing a schematic configuration of a lower intermediate block of a tower foundation according to the first embodiment. [Figure 22] FIG. 1 is a side view showing a schematic configuration of a steel tower to which a steel tower foundation structure according to a first embodiment is applied. [Diagram 23] FIG. 11 is a perspective view showing a schematic configuration of a tower foundation according to a modified example of the first embodiment. [Figure 24] FIG. 11 is a perspective view showing a schematic configuration of a tower foundation according to a second embodiment. [Diagram 25] FIG. 11 is a plan view showing a schematic configuration of a tower foundation according to a second embodiment. [Figure 26] 26 is a cross-sectional view (a cross-sectional view showing a state cut along line 26-26 in FIG. 25) showing a schematic configuration of a steel tower foundation according to a second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0050] First Embodiment Hereinafter, a first embodiment of a tower foundation structure according to the present invention will be described with reference to Figs. 1 to 23.

[0051] As shown in Figure 22, a "tower 12" equipped with a "tower foundation 10 (hereinafter simply referred to as foundation 10)" to which the tower foundation structure according to this embodiment is applied is configured to include a plurality of main pillar members 14, a plurality of horizontal members 16, a plurality of diagonal members 18, and a plurality of main pillar member auxiliary members 20 that are bridged between the main pillar members 14 and the diagonal members 18, and is equipped with four "steel frame legs 22." In the following, unless otherwise specified, the height direction of the tower 12 will be simply referred to as the height direction. Furthermore, the height direction of the tower 12 coincides with the vertical direction.

[0052] As shown in Figs. 1 and 2, the foundation 10 supports a "leg member 24" constituting a part of the steel frame leg 22 against a "base ground 25", and has a rectangular parallelepiped shape as a whole.

[0053] In addition, arrow X, as appropriately shown in each drawing, indicates one side in the length direction of the foundation 10, arrow Y indicates one side in the width direction of the foundation 10 perpendicular to the length direction of the foundation 10, 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 10 when installed. Furthermore, hereinafter, unless otherwise specified, the length direction of the foundation 10 will be simply referred to as the length direction, and the width direction of the foundation 10 will be simply referred to as the width direction.

[0054] The foundation 10 is composed of an “inner piece 26 ”, a pair of “piles 28 ”, a floor plate 30 that constitutes the main part of the foundation 10 , and a column-constituting piece 32 .

[0055] 4, the inner piece 26 is provided integrally with the "end portion 24A" on the lower side in the height direction of the leg member 24. This inner piece 26 is made of precast concrete, and is configured in the shape of a rectangular column extending in the height direction.

[0056] More specifically, the inner piece 26 is octagonal in shape with the four corners of a square cut into an isosceles triangle as viewed in the height direction, and has a plurality of recesses 34 on its outer circumferential surface 26A. The recesses 34 are formed in an annular shape along the circumferential direction of the outer circumferential surface 26A as viewed in the height direction, and a plurality of recesses 34 are arranged in the height direction. The inner piece 26 is placed on the bottom 35A of an excavation hole 35 in which the main part of the foundation 10 is accommodated, the hole 35 being formed by excavating the installation ground 25.

[0057] On the other hand, as shown in Fig. 5, the leg member 24 is mainly formed by joining a main body 36 made of angle iron and a base 38 made of flat steel at a joint (not shown) by welding or the like. More specifically, the lower part of the main body 36 in the height direction is embedded in the inner piece 26, and the upper part in the height direction is exposed from the inner piece 26 and extends upward in the height direction. In addition, a plurality of support plates 40 made of angle iron are attached to the main body 36 along its extension direction by mounting members (not shown).

[0058] 2 and 6, the pile 28 is made of a cylindrical steel pipe extending in the height direction, and is driven into a borehole 42 formed by drilling the bottom 35A of the drilling hole 35 by a pile driver (not shown). A grout material (not shown) is filled between the hole wall 42A of the borehole 42 and the surface of the pile 28. The pile 28 is disposed on the lower side in the height direction of one side of the floor plate 30 in the length direction and on the lower side in the height direction of the other side of the floor plate 30 in the length direction.

[0059] Additionally, a plurality of "anchoring bars 44" extending in the height direction are arranged along the circumferential direction of the pile 28 at the upper portion in the height direction of the pile 28. The lower ends of these anchoring bars 44 in the height direction are joined to the pile 28 at joints (not shown) by welding or the like, and the main portions extend from the pile 28 upward in the height direction.

[0060] On the other hand, as shown in Figure 2, the floor panel 30 is shaped as a rectangular parallelepiped as a whole to fit into the excavation hole 35, and is composed of a "central floor panel portion 46", a pair of "additional floor panel portions 48", and a pair of "lower intermediate blocks 50".

[0061] In detail, the central floor panel portion 46 forms the longitudinal center portion of the floor panel 30, and is composed of an "upper central floor panel block 52" which forms the upper portion in the height direction, and a "lower central floor panel block 54" which forms the lower portion in the height direction.

[0062] As shown in Figures 9 to 11, the upper central floor block 52 is composed of a precast concrete main body 56 which forms the main part of the block, upper hoops 58, lower hoops 60, spiral reinforcement 62 and a plurality of "main reinforcements 64" as first upper reinforcement bars embedded in the main body 56.

[0063] The main body 56 is rectangular in shape with its longitudinal direction as viewed from the height direction, and is a rectangular parallelepiped with a thickness set to a dimension smaller than the dimension of the shorter side of the rectangle, and a through hole 66 is formed in its center as viewed from the height direction.

[0064] Further, a plurality of recesses 68 are formed on the inner peripheral surface 66A of the through portion 66. These recesses 68 are each formed in an annular shape along the circumferential direction of the inner peripheral surface 66A when viewed from the height direction, and are arranged consecutively in the height direction.

[0065] Meanwhile, a plurality of recesses 70 are formed on the upper surface 56A of the main body 56, each of which is rectangular with its longitudinal direction as viewed from the height direction and recessed downward in the height direction. The recesses 70 are arranged in a row in the width direction on each of one and the other lengthwise sides of the upper surface 56A (five on each side, for example), and the side opposite the through-hole 66 is open.

[0066] The upper hoop reinforcement 58 is formed by bending a deformed steel bar having a larger cross-sectional area (thicker than the spiral reinforcement 62) into a circular shape as viewed in the height direction, and by joining the ends of the bar together at a joint (not shown) by welding or the like. The upper hoop reinforcement 58 is disposed in the upper part of the body 56 in the height direction so as to surround the through-hole 66 as viewed in the height direction. The upper hoop reinforcement 58 may be formed of round steel.

[0067] The lower hoop 60 is basically configured similarly to the upper hoop 58, but is fitted inside the upper hoop 58 when viewed in the height direction and is annular in shape surrounding the penetration portion 66. The lower hoop 60 is also disposed below the upper hoop 58 in the height direction.

[0068] The spiral reinforcement 62 is made of a deformed steel bar, and is annularly shaped so as to fit inside the lower hoop reinforcement 60 when viewed from the height direction and surround the through-hole 66, and is spiral-shaped with the axial direction being the height direction. This spiral reinforcement 62 is disposed below the lower hoop reinforcement 60 in the height direction. The spiral reinforcement 62 may be made of round steel. Also, instead of the spiral reinforcement 62, a configuration may be adopted in which a plurality of hoop reinforcements with both ends closed are arranged in a row in the height direction.

[0069] The main reinforcing bars 64 are made of deformed steel bars, and a plurality of the main reinforcing bars 64 (for example, five bars each) are arranged on each of one and the other sides in the length direction of the main body 56.

[0070] Specifically, the main reinforcing bar 64 includes an anchoring portion 64A and a connecting portion 64B. The anchoring portion 64A extends in the height direction and is located on the inner periphery side of the spiral reinforcement 62 when viewed from the height direction, and is fixed to the spiral reinforcement 62 with a tie wire or the like (not shown).

[0071] On the other hand, the connection part 64B extends from the upper part of the fixing part 64A in the height direction, passes between the upper hoop reinforcement 58 and the lower hoop reinforcement 60, and extends in the length direction inside the recess 70. That is, in this embodiment, a part of the connection part 64B is exposed inside each recess 70.

[0072] As shown in Figures 12 to 14, the lower central floor block 54 is composed of a precast concrete main body 72 which forms the main part of the block, lower hoops 74 embedded in the main body 72, upper hoops 76, spiral reinforcement 78, and a plurality of "main reinforcements 80" as first lower reinforcement bars.

[0073] When viewed from the height direction, the main body 72 is rectangular in shape with a widthwise length similar to that of the main body 56 and a lengthwise length shorter than that of the main body 56, and is a rectangular parallelepiped with a thickness similar to that of the main body 56. Furthermore, the main body 72 is formed with a through portion 82 in its center when viewed from the height direction, the through portion 82 being the same size as the through portion 66.

[0074] Further, a plurality of recesses 84 are formed on the inner peripheral surface 82A of the through portion 82. These recesses 84 are each formed in an annular shape along the circumferential direction of the inner peripheral surface 82A when viewed from the height direction, and are arranged consecutively in the height direction.

[0075] The lower hoop reinforcement 74 is configured by bending a deformed steel bar having a larger cross-sectional area (thicker than the spiral reinforcement 78) into a circular shape as viewed in the height direction, and by joining the ends of the bar together at a joint (not shown) by welding or the like. The lower hoop reinforcement 74 is disposed on the lower part of the body 72 in the height direction so as to surround the through-hole 82 as viewed in the height direction. The lower hoop reinforcement 74 may be configured of round steel.

[0076] The upper hoop 76 is basically configured similarly to the lower hoop 74, but is fitted inside the lower hoop 74 when viewed in the height direction and has a ring shape surrounding the penetration part 82. The upper hoop 76 is also disposed above the lower hoop 74 in the height direction.

[0077] The spiral reinforcement 78 is made of a deformed steel bar, and is annularly shaped so as to be contained inside the upper hoop reinforcement 76 when viewed from the height direction and surround the through-hole 82, and is spirally shaped with its axial direction being the height direction. The spiral reinforcement 78 is disposed above the upper hoop reinforcement 76 in the height direction. Note that instead of the spiral reinforcement 78, a configuration in which a plurality of hoop reinforcements with both ends closed are disposed in a row in the height direction may be adopted.

[0078] The main reinforcing bars 80 are made of deformed steel bars, and a plurality of them (for example, five bars each) are arranged on each of one and the other longitudinal sides of the main body 72. The main reinforcing bars 80 may be made of round steel bars.

[0079] Specifically, the main reinforcing bar 80 includes an anchoring portion 80A and a connecting portion 80B. The anchoring portion 80A extends in the height direction and is located on the inner periphery side of the spiral muscle 78 when viewed from the height direction, and is fixed to the spiral muscle 78 with a tie wire or the like (not shown).

[0080] On the other hand, the connection part 80B extends from the lower part in the height direction of the fixing part 80A, passes between the lower hoop reinforcement 74 and the upper hoop reinforcement 76, and extends from the main body part 72 to the opposite side of the through part 82, thereby extending in the length direction. In this embodiment, a plurality of connection parts 80B are arranged at predetermined intervals in the width direction on each of the side surface 72A on one side in the length direction of the main body part 72 and the side surface 72B on the other side in the length direction of the main body part 72.

[0081] Returning to Fig. 2, the upper central floor plate block 52 and the lower central floor plate block 54 are positioned so that the through-hole 66 of the upper central floor plate block 52 and the through-hole 82 of the lower central floor plate block 54 overlap when viewed in the height direction. In the following, the through-hole formed by combining the through-hole 66 and the through-hole 82 will be referred to as the "inner through-hole 86."

[0082] Also, when viewed from the height direction, side surface 72A on one side in the length direction of main body portion 72 is located on the other side in the length direction with respect to side surface 56B on one side in the length direction of main body portion 56. Furthermore, side surface 72B on the other side in the length direction of main body portion 72 is located on one side in the length direction with respect to side surface 56C on the other side in the length direction of main body portion 56.

[0083] The above-mentioned inner piece 26 is disposed inside the inner through-hole 86 in the central floor panel portion 46 configured as described above. In other words, the inner piece 26 is surrounded by the inner through-hole 86 when viewed from the height direction.

[0084] 3, a plurality of "column main reinforcing bars 88" are disposed between the inner piece 26 and the inner peripheral surface 86A of the inner penetration portion 86 as main reinforcing bars. These column main reinforcing bars 88 are made of deformed steel bars, extend in the height direction, and are disposed in a row along the circumferential direction of the inner penetration portion 86 as viewed in the height direction. These column main reinforcing bars 88 are fixed to hoop bars (not shown) or the like with binding wires (not shown). A column constituent piece 32 is disposed on the upper side in the height direction of the central floor plate portion 46.

[0085] 7 and 8, the column constituent piece 32 is composed of a main body 90 made of precast concrete, which constitutes the main portion of the column, and spiral reinforcement 92 embedded in the main body 90. The column constituent piece 32 constitutes a part of the lower side in the height direction of the column that extends from the floor plate 30 upward in the height direction.

[0086] The main body 90 is formed in a ring shape such that its inner peripheral surface 90A is circular and conforms to the inner through-hole 86 of the central floor plate 46 when viewed from the height direction. A plurality of recesses 94 are formed in the inner peripheral surface 90A. These recesses 94 are each formed in an annular shape that conforms to the circumferential direction of the inner peripheral surface 90A when viewed from the height direction, and are arranged in a row in the height direction.

[0087] On the other hand, the spiral muscle 92 is made of a deformed steel bar, and is formed into a circular ring shape surrounding the inner peripheral surface 90A when viewed from the height direction, and is formed into a spiral shape with the axial direction being the height direction. The spiral muscle 92 may be made of round steel. Also, instead of the spiral muscle 92, a configuration in which multiple hoop muscles with both ends closed are arranged in a row in the height direction may be adopted.

[0088] 1 and 3, in this embodiment, a portion of the column main reinforcing bars 88 is located on the inner periphery side of the main body portion 90. An "inner intermediate portion 96" is formed by filling concrete between the inner periphery 86A of the inner penetrating portion 86, the inner periphery 90A of the main body portion 90, and the outer periphery 26A of the inner piece 26. Note that, in order to make it easier to understand the configuration of the column main reinforcing bars 88, etc., the inner intermediate portion 96 is not shown in FIG. 1.

[0089] That is, the inner intermediate portion 96 is interposed between the inner peripheral surface 86A and the inner peripheral surface 90A and the outer peripheral surface 26A, and the column main reinforcing bars 88 are embedded in the inner intermediate portion 96. In this embodiment, the inner piece 26, the column constituent piece 32, the upper central floor panel block 52, and the lower central floor panel block 54 are connected via the column main reinforcing bars 88 and the inner intermediate portion 96.

[0090] Next, the configuration of the additional floor plate portion 48 will be described. As shown in Fig. 1, the additional floor plate portion 48 is disposed on one side in the longitudinal direction of the central floor plate portion 46 and on the other side in the longitudinal direction of the central floor plate portion 46. Below, the configuration of the additional floor plate portion 48 and its surroundings will be described using the additional floor plate portion 48 disposed on the other side in the longitudinal direction of the central floor plate portion 46 as an example.

[0091] The additional deck section 48 is arranged vertically above the pile 28 described above, and is composed of an "upper additional deck block 98" that constitutes the upper part in the vertical direction, and a "lower additional deck block 100" that constitutes the lower part in the vertical direction.

[0092] As shown in Figures 15 to 17, the upper additional deck block 98 is composed of a main body 102 made of precast concrete which forms the main part of the block, hoop reinforcement 104 embedded in the main body 102, spiral reinforcement 106, and a plurality of "main steel bars 108" as second upper reinforcement bars.

[0093] The main body 102 has a rectangular parallelepiped shape with a width length, as viewed from the height direction, similar to the width length of the main body 56 of the upper central floor board block 52, and a thickness similar to the thickness of the main body 56. Furthermore, the main body 102 has a through-hole 110 formed near the center thereof as viewed from the height direction.

[0094] Further, a plurality of "recesses 112" are formed on the inner peripheral surface 110A of the through portion 110. These recesses 112 are formed in annular shapes along the circumferential direction of the inner peripheral surface 110A when viewed from the height direction, and are arranged consecutively in the height direction.

[0095] Furthermore, a plurality of recesses 114 are formed on the upper surface 102A of the main body 102, each of which is rectangular with its longitudinal direction as viewed from the height direction and recessed downward in the height direction. A plurality of recesses 114 (five in one example) are arranged in a row in the width direction on one side of the length direction of the upper surface 102A, and the side opposite the through-hole 110 is open.

[0096] On the other hand, a "protrusion 102C" that extends in the width direction and protrudes downward in the height direction is formed on the lower surface of the body 102 in the height direction, i.e., on one side of the length direction of the through-hole 110 on the lower surface 102B. In addition, on the lower surface 102B, recesses 102D that extend in the width direction and are recessed upward in the height direction are formed on both sides of the protrusion 102C in the length direction.

[0097] The hoop reinforcement 104 is formed by bending a deformed steel bar having a larger cross-sectional area (thicker than the spiral reinforcement 106) into a circular shape when viewed from the height direction, and by joining the ends of the bar at a joint (not shown) by welding or the like. The hoop reinforcement 104 is disposed in the upper part of the body 102 in the height direction so as to surround the penetration portion 110 when viewed from the height direction. The hoop reinforcement 104 may be formed from round steel.

[0098] The spiral reinforcement 106 is made of a deformed steel bar, and is annularly shaped so as to fit inside the hoop reinforcement 104 when viewed from the height direction and surround the penetration portion 110, and is spirally shaped with its axial direction being the height direction. This spiral reinforcement 106 is disposed below the hoop reinforcement 104 in the height direction. The spiral reinforcement 106 may be made of round steel. Also, instead of the spiral reinforcement 106, a configuration may be adopted in which multiple hoop reinforcements with both ends closed are arranged in a row in the height direction.

[0099] The main reinforcing bars 108 are made of deformed steel bars, and a plurality of the main reinforcing bars 108 (five bars, for example) are arranged on one side of the main body 102 in the longitudinal direction.

[0100] Specifically, the main reinforcing bar 108 includes an anchoring portion 108A and a connecting portion 108B. The anchoring portion 108A extends in the height direction and is located on the inner periphery side of the spiral muscle 106 when viewed from the height direction, and is fixed to the spiral muscle 106 with a tie wire or the like (not shown).

[0101] On the other hand, the connection portion 108B extends from the upper part of the fixing portion 108A in the height direction, passes above the hoop 104 in the height direction, and extends in the length direction inside the recess 114. That is, in this embodiment, a part of the connection portion 108B is exposed inside each recess 114.

[0102] Moreover, the upper additional floor plate block 98 constructed as described above is disposed adjacent to the upper central floor plate block 52 .

[0103] As shown in Figures 18 to 20, the lower additional deck block 100 is composed of a main body 116 made of precast concrete which constitutes the main part of the block, hoop reinforcement 118 embedded in the main body 116, spiral reinforcement 120, and a plurality of "main steel bars 122" as second lower reinforcement bars.

[0104] When viewed from the height direction, main body 116 is rectangular in shape with a widthwise length similar to that of main body 102 and a lengthwise length shorter than that of main body 102, and is a rectangular parallelepiped with a thickness similar to that of main body 102. Furthermore, main body 116 is formed with a through portion 124 having a size similar to that of through portion 110 near the center thereof when viewed from the height direction.

[0105] Further, a plurality of "recesses 126" are formed on the inner peripheral surface 124A of the through portion 124. These recesses 126 are formed in annular shapes along the circumferential direction of the inner peripheral surface 124A when viewed from the height direction, and are arranged consecutively in the height direction.

[0106] Furthermore, on the upper surface in the height direction of main body 116, i.e., on one side of penetrating portion 124 in the length direction on top surface 116A, a pair of "protrusions 116B" are formed as second protrusions that extend in the width direction and protrude upward in the height direction and can fit into recess 102D of main body 102. Also, on top surface 116A, recess 116C is formed that extends in the width direction between the pair of protrusions 116B, is recessed downward in the height direction, and can fit protrusion 102C of main body 102.

[0107] Meanwhile, a plurality of recesses 128, each of which is rectangular with its longitudinal direction as viewed from the height direction and recessed upward in the height direction, are formed on the lower surface 116D of the main body 116. Five of the recesses 128 are arranged in a row in the width direction on one side of the length direction of the lower surface 116D, and the side opposite the through-hole 124 is open.

[0108] The hoop reinforcement 118 is configured by bending a deformed steel bar having a larger cross-sectional area (thicker than the spiral reinforcement 120) into a circular shape as viewed in the height direction, and by joining the ends of the bar together at a joint (not shown) by welding or the like. The hoop reinforcement 118 is disposed in the lower part of the body 116 in the height direction so as to surround the through-hole 124 as viewed in the height direction. The hoop reinforcement 118 may be configured of round steel.

[0109] The spiral muscle 120 is made of a deformed steel bar, and is annularly shaped so as to fit inside the hoop muscle 118 when viewed from the height direction and surround the through-hole 124, and is spiral-shaped with its axial direction being the height direction. This spiral muscle 120 is disposed above the hoop muscle 118 in the height direction. The spiral muscle 120 may be made of round steel. Also, instead of the spiral muscle 120, a configuration may be adopted in which multiple hoop muscles with both ends closed are arranged in a row in the height direction.

[0110] The main reinforcing bars 122 are made of deformed steel bars, and a plurality of the main reinforcing bars 122 (five bars, for example) are arranged on one side of the main body 116 in the longitudinal direction.

[0111] Specifically, the main reinforcing bar 122 includes an anchoring portion 122A and a connecting portion 122B. The anchoring portion 122A extends in the height direction and is located on the inner periphery side of the spiral muscle 120 as viewed in the height direction, and is fixed to the spiral muscle 120 with a tie wire or the like (not shown).

[0112] On the other hand, the connection portion 122B extends from a lower portion in the height direction of the fixing portion 108A, passes through the lower side in the height direction of the hoop reinforcement 118 and the inside of the recess 128, and a part of the connection portion 122B extends to one side in the length direction from the recess 128. That is, in this embodiment, a part of the connection portion 122B is exposed inside each recess 128.

[0113] Moreover, the lower additional floor plate block 100 constructed as described above is disposed at a predetermined interval in the length direction from the lower central floor plate block 54.

[0114] Returning to Figure 2, the upper additional floor board block 98 and the lower additional floor board block 100 are positioned so that the penetration part 110 of the upper additional floor board block 98 overlaps with the penetration part 124 of the lower additional floor board block 100 when viewed from the height direction. Note that hereinafter, the penetration part consisting of the penetration part 110 and the penetration part 124 will be referred to as the "outer penetration part 130".

[0115] Also, when viewed from the height direction, side surface 116E of main body portion 116 facing central floor plate portion 46 is located on the opposite side to central floor plate portion 46 compared to side surface 102E of main body portion 102 facing central floor plate portion 46. Furthermore, side surface 102F of main body portion 102 opposite central floor plate portion 46 and side surface 116F of main body portion 116 opposite central floor plate portion 46 are located at similar positions in the length direction.

[0116] Furthermore, protrusion 102C of main body 102 is fitted into recess 116C of main body 116, and protrusion 116B of main body 116 is fitted into recess 102D of main body 102.

[0117] That is, protrusion 102C is engaged between a pair of protrusions 116B, and protrusions 102C and 116B limit the relative displacement in the longitudinal direction between the upper additional deck block 98 and the lower additional deck block 100. In the following, the assembly of protrusions 102C and 116B will be referred to as the "first limiting portion 132."

[0118] Furthermore, as shown in Figures 1 and 3, a pile 28 is located inside the outer penetration portion 130 of the additional deck panel portion 48 configured as described above, when viewed from the height direction, and the anchor reinforcement 44 is surrounded by the outer penetration portion 130.

[0119] The "outer intermediate portion 134" is formed by filling the inside of the outer penetration portion 130 with concrete, and the anchoring bars 44 are embedded in this outer intermediate portion 134. Note that, in order to make it easier to understand the configuration of the anchoring bars 44, etc., the outer intermediate portion 134 is not shown in FIG. 1.

[0120] The anchor bars 44 and the outer intermediate portion 134 limit the relative displacement in the height direction between the upper additional deck block 98 and the lower additional deck block 100. In the following, the assembly of the anchor bars 44 and the outer intermediate portion 134 will be referred to as the "second limiting portion 136."

[0121] In this embodiment, the upper center floor plate block 52 and the upper additional floor plate block 98 are connected in the length direction by a "joint member 138" as a first joint, as shown in Fig. 15. The lower center floor plate block 54 and the lower additional floor plate block 100 are connected in the length direction by a "joint member 140" as a second joint, as shown in Fig. 18.

[0122] More specifically, as shown in Fig. 16, the joint member 138 is made of a cylindrical steel material with its axial direction being the length direction, and is disposed for all of the connection parts 108B of the upper additional floor panel block 98. As shown in Fig. 3, the joint member 138 is in a state where the connection part 108B is inserted into the other side part in the length direction.

[0123] 17, the connection part 64B of the upper central floor panel block 52, which faces the connection part 108B in the longitudinal direction, is inserted into one longitudinal side portion of the joint member 138. Then, by filling the inside of the joint member 138 with mortar or the like, the connection parts 108B and 64B are connected, and thus the upper additional floor panel block 98 and the upper central floor panel block 52 are connected.

[0124] During construction, etc., the main portion of the connection portion 108B of the upper additional deck block 98 is inserted into the joint member 138, and the main portion of the joint member 138 is contained in the recess 114.

[0125] As shown in Figure 19, the joint member 140 is made of cylindrical steel material with the longitudinal direction as the axial direction, and is positioned at all of the connection portions 122B of the lower additional deck block 100, with the connection portions 122B inserted into the other longitudinal side portion.

[0126] 20, the connection part 80B of the lower center floor panel block 54, which faces the connection part 122B in the longitudinal direction, is inserted into one longitudinal side of the joint member 140. Then, by filling the inside of the joint member 138 with mortar or the like, the connection parts 122B and 80B are connected, and the lower additional floor panel block 100 and the lower center floor panel block 54 are connected.

[0127] During construction, etc., the main portion of the connection portion 122B of the lower additional deck block 100 is inserted into the joint member 140, and approximately half of the joint member 140 on the other side of its length is fitted into the recess 128.

[0128] On the other hand, the lower intermediate block 50 is made of precast concrete, and as shown in Figures 2 and 21, the lower intermediate block 50 is a rectangular prism whose width length is the same as the width length of the lower central floor block 54 and the lower additional floor block 100, and whose thickness (height) is the same as that of the lower central floor block 54 and the lower additional floor block 100.

[0129] In addition, in the lower part of the lower intermediate block 50 in the height direction, the coupling members 140 are fitted from the lower side in the height direction, and "groove portions 142" extending in the length direction are formed in the same number as the number of the coupling members 140.

[0130] The lower intermediate block 50 configured as described above is disposed between the lower center floor plate block 54 and the lower additional floor plate block 100. In addition, above the lower intermediate block 50 in the height direction, the upper center floor plate block 52 and a part of the upper additional floor plate block 98 are located.

[0131] In addition, the upper side in the height direction of the foundation 10 configured as described above is piled up with excavated soil (not shown) that is generated when the excavation hole 35 is excavated.

[0132] (Actions and Effects of the Present Embodiment) Next, the operation and effects of this embodiment will be described.

[0133] In this embodiment, as shown in FIG. 1, the inner piece 26 is provided integrally with a lower end in the height direction of a leg member 24 that constitutes a part of the steel frame leg 22 of the steel tower 12.

[0134] In this embodiment, the main portion of the central floor panel 46 is made of precast concrete, and an inner through-hole 86 that surrounds the inner piece 26 when viewed from the height direction is formed in the central floor panel 46, as shown in Fig. 2. An inner intermediate portion 96 made of concrete is interposed between the inner piece 26 and the inner peripheral surface 86A of the inner through-hole 86, as shown in Fig. 3.

[0135] For this reason, in this embodiment, even if a pull-out load caused by electric wires suspended from the steel tower 12 acts on the leg member 24, this pull-out load can be supported by the weight of the central floor plate portion 46. Moreover, the time required for curing the concrete can be shortened compared to when the central floor plate portion 46 is constructed by pouring concrete on-site.

[0136] Incidentally, when it is anticipated that a large pull-out load will act on the leg member 24, it is possible to add a precast concrete member to the central floor plate portion 46, thereby applying a load downward in the height direction to the leg member 24. For example, by piling up precast concrete members in the height direction on the central floor plate portion 46, it is possible to apply a load downward in the height direction to the leg member 24.

[0137] Specifically, the main part of the central floor panel portion 46 is made of cylindrical precast concrete, and components made of cylindrical precast concrete are stacked vertically above the central floor panel portion 46.

[0138] However, when using precast concrete members of the same mass, it is easier to secure the contact area, i.e., the shear cross-sectional area, between the member and the installation ground 25 with a member having a square periphery as viewed from the height direction than with a member having a circular periphery as viewed from the height direction. Also, in order to dig a circular hole in the installation ground 25 as viewed from the height direction, the hole walls must be shaped manually, which is thought to increase the construction time.

[0139] In this embodiment, the central floor panel portion 46 is rectangular when viewed from the height direction. The additional floor panel portion 48, which is rectangular when viewed from the height direction and whose main portion is made of precast concrete, is disposed adjacent to the central floor panel portion 46 in a direction perpendicular to the height direction, specifically in the length direction, and is connected to the central floor panel portion 46.

[0140] For this reason, in this embodiment, a load can be applied downward in the height direction to the leg member 24 by the central floor plate portion 46 and the additional floor plate portion 48. Also, compared to a case in which the central floor plate portion 46 and the additional floor plate portion 48 are made of precast concrete having a circular outer periphery when viewed in the height direction, it is easier to ensure the shear cross-sectional area between the central floor plate portion 46 and the additional floor plate portion 48 and the installation ground 25, and the excavation time required to excavate the excavation hole 35 in which the central floor plate portion 46 and the additional floor plate portion 48 are installed in the installation ground 25 can be reduced.

[0141] Returning to Fig. 1, in this embodiment, the central floor plate portion 46 is configured to include an upper central floor plate block 52 that constitutes the upper part in the height direction, and a lower central floor plate block 54 that constitutes the lower part in the height direction. Therefore, in this embodiment, when the central floor plate portion 46 is transported to the construction site, the central floor plate portion 46 can be transported by dividing it into the upper central floor plate block 52 and the lower central floor plate block 54.

[0142] However, if the central floor plate section 46 is constructed by simply stacking the upper central floor plate block 52 and the lower central floor plate block 54, a load such as a pull-out load acting on the leg member 24 will act independently on the upper central floor plate block 52 and the lower central floor plate block 54. As a result, it will be difficult for the entire central floor plate section 46 to support the bending moment caused by this load.

[0143] 2 and 3, in this embodiment, the inner penetration portion 86 penetrates the upper central floor plate block 52 and the lower central floor plate block 54. A plurality of column main reinforcing bars 88 extending in the height direction are embedded in the inner interposed portion 96, and these column main reinforcing bars 88 are arranged in a row along the circumferential direction of the inner penetration portion 86 when viewed in the height direction.

[0144] For this reason, in this embodiment, multiple column main reinforcements 88 are connected to the upper central floor plate block 52 and the lower central floor plate block 54 via the inner interposition portion 96, and as a result, the bending moment caused by the load acting on the central floor plate portion 46 can be supported by the entire central floor plate portion 46.

[0145] Returning to Fig. 1, in this embodiment, the additional floor board section 48 is configured to include an upper additional floor board block 98 that constitutes the upper part in the height direction, and a lower additional floor board block 100 that constitutes the lower part in the height direction. Therefore, in this embodiment, when the additional floor board section 48 is transported to the construction site, the additional floor board section 48 can be transported by dividing it into the upper additional floor board block 98 and the lower additional floor board block 100.

[0146] Incidentally, it is considered that a bending moment due to an external force acting from the central floor plate portion 46 will be generated in the additional floor plate portion 48. If the above-mentioned bending moment is generated in the additional floor plate portion 48 in a state where the relative displacement between the upper additional floor plate block 98 and the lower additional floor plate block 100 is not restricted, slippage will occur between the upper additional floor plate block 98 and the lower additional floor plate block 100, making it difficult for the additional floor plate portion 48 as a whole to support the bending moment.

[0147] 2 and 3, the present embodiment includes a first limiting portion 132 that limits the relative displacement between the upper additional floor board block 98 and the lower additional floor board block 100 in the connecting direction between the central floor board portion 46 and the additional floor board portion 48, i.e., in the length direction. Also, a second limiting portion 136 that limits the relative displacement between the upper additional floor board block 98 and the lower additional floor board block 100 in the height direction is provided.

[0148] Therefore, when the above-mentioned bending moment occurs in the additional floor plate portion 48, slippage between the upper additional floor plate block 98 and the lower additional floor plate block 100 is prevented, and the bending moment can be supported by the entire additional floor plate portion 48.

[0149] In addition, in this embodiment, as shown in Figure 11, the main part of the main reinforcing bars 64 is embedded in the main body portion 56 of the upper central floor plate block 52, and a part of the main reinforcing bars 64 extends from the upper vertical part of the upper central floor plate block 52 toward the upper additional floor plate block 98.

[0150] 17, the main portion of the main reinforcing bars 108 is embedded in the body 102 of the upper additional deck block 98, and a portion of the main reinforcing bars 108 extends from the upper portion of the upper additional deck block 98 in the height direction toward the upper central deck block 52. The main reinforcing bars 64 and the main reinforcing bars 108 are connected by joint members 138.

[0151] Also, as shown in Figure 14, the main part of the main reinforcing bars 80 is embedded in the main body portion 72 of the lower central floor panel block 54, and a part of the main reinforcing bars 80 extends from the lower vertical part of the lower central floor panel block 54 toward the lower additional floor panel block 100.

[0152] 20, the main reinforcing bars 122 are embedded in the main body 116 of the lower additional floor plate block 100, and part of the main reinforcing bars 122 extends from the lower part of the lower additional floor plate block 100 in the height direction toward the lower central floor plate block 54. The main reinforcing bars 80 and the main reinforcing bars 12 are connected by joint members 140.

[0153] For this reason, in this embodiment, the bending moment caused by a pull-out load, etc. acting on the leg member 24 can be supported by the upper height portions of the upper central floor block 52 and the upper additional floor block 98, where the effect of the bending moment tends to be greater, and the lower height portions of the lower central floor block 54 and the lower additional floor block 100.

[0154] However, depending on the height dimension (thickness) of the lower central floor plate block 54 and the lower additional floor plate block 100, it may be difficult to check the connection state between the main reinforcing bars 80 and the main reinforcing bars 108 by the joint members 140.

[0155] On the other hand, if the lower central floor block 54 and the lower additional floor block 100 are separated to check the above-mentioned connection state, it will be necessary to fill the gap between the lower central floor block 54 and the lower additional floor block 100 with mortar or the like.

[0156] Here, in this embodiment, as shown in Fig. 1, a lower intermediate block 50 is provided, and this lower intermediate block 50 is disposed between the lower center floor panel block 54 and the lower additional floor panel block 100. Also, as shown in Fig. 21, a groove portion 142 is formed in the lower intermediate block 50, into which the joint member 140 fits from below in the height direction.

[0157] For this reason, in this embodiment, a gap is secured between the lower central deck block 54 and the lower additional deck block 100 in which the lower intermediate block 50 can be accommodated, and the connection state between the main reinforcing bars 80 and the main reinforcing bars 122 by the joint members 140 can be confirmed through this gap.

[0158] In addition, after confirming the above-mentioned connection state, the lower intermediate block 50 can be placed between the lower central floor plate block 54 and the lower additional floor plate block 100 so that the joint member 140 fits into the groove portion 142, thereby filling the space between the lower central floor plate block 54 and the lower additional floor plate block 100 with the lower intermediate block 50.

[0159] Returning to Figure 2, in this embodiment, a protrusion 102C is provided on the lower height surface of the upper additional floor board block 98, and this protrusion 102C extends in a direction perpendicular to the connection direction between the central floor board portion 46 and the additional floor board portion 48.

[0160] In addition, a protrusion 116B is provided on the upper surface in the height direction of the lower additional floor board block 100, and this protrusion 116B extends in a direction perpendicular to the above-mentioned connection direction.

[0161] In this embodiment, the projection 102C and the projection 116B are engaged with each other, thereby restricting the relative displacement between the upper additional floor board block 98 and the lower additional floor board block 100 in the above-mentioned connecting direction.

[0162] Returning to Fig. 3, in this embodiment, a plurality of additional floor plate portions 48 are disposed relative to the central floor plate portion 46. Also, an outer through-hole portion 130 is formed penetrating the additional floor plate portion 48 in the height direction, and a plurality of recesses 112 and recesses 126 are formed on the inner peripheral surface portion of this outer through-hole portion 130 along the circumferential direction of the outer through-hole portion 130, as shown in Figs.

[0163] On the other hand, as shown in Figures 2 and 3, piles 28 are embedded in the installation ground 25 below the additional floor plate portion 48 in the height direction, and a plurality of anchoring bars 44 extend from the piles 28 to the upper side in the height direction. These anchoring bars 44 are arranged along the circumferential direction of the outer penetration portion 130 of the additional floor plate portion 48 when viewed in the height direction.

[0164] In this embodiment, the outer interposed portion 134 is formed by filling the outer through-hole 130 with concrete, and as shown in Fig. 17 and Fig. 20, the outer interposed portion 134 is provided with a plurality of protrusions 134A that engage with the recesses 112 and the recesses 126 provided in the inner circumferential surface portion 130A of the outer through-hole 130. The anchoring bars 44 extending from the piles 28 are embedded in the outer interposed portion 134.

[0165] For this reason, in this embodiment, the upper additional deck block 98 and the lower additional deck block 100 are connected by the anchor bars 44 and the outer intermediate portion 134, and the relative displacement between the upper additional deck block 98 and the lower additional deck block 100 is restricted. For this reason, in this embodiment, the pull-out load acting on the leg member 24 can be supported by the entire additional deck portion 48.

[0166] Furthermore, in this embodiment, the pull-out load acting on the leg member 24 can be supported by multiple piles 28, so the diameter of the piles can be made smaller than when only one pile is used to support this pull-out load.

[0167] As a result, it becomes possible to drive the piles 28 into the construction ground 25 using a relatively small pile driver, making it easy to transport the pile driver to the construction site.

[0168] As described above, in this embodiment, the weight of the foundation 10 is ensured, the construction time required to build the foundation 10 is shortened, and the shear area between the foundation 10 and the installation ground 25 can be ensured.

[0169] <Modification of the first embodiment> Hereinafter, a tower foundation structure according to a modified example of the above-mentioned first embodiment will be described with reference to Fig. 23. Note that the same components as those in the above-mentioned first embodiment will be given the same reference numbers and the description thereof will be omitted.

[0170] In the foundation 10 of this modified example, additional floor plate portions 48 are also arranged on one widthwise side and the other widthwise side of the "central floor plate portion 150" corresponding to the central floor plate portion 46, and piles 28 are arranged vertically below these additional floor plate portions 48.

[0171] More specifically, in this modification, the precast concrete body 154 in the "upper central floor block 152" of the central floor panel section 150 includes a main portion 154A which constitutes the main portion thereof, and a pair of connecting portions 154B. The main portion 154A has the same configuration as the body 56 of the upper central floor panel block 52, and is provided with connecting portions 154B on one widthwise side and the other widthwise side.

[0172] The connecting portion 154B is shaped like a rectangular parallelepiped whose length is in the longitudinal direction and whose thickness is the same as that of the main portion 154A and whose length in the longitudinal direction is slightly shorter than that of the main portion 154A. In other words, the upper center floor plate block 152 is shaped like a polygon formed by combining squares when viewed from the height direction.

[0173] Furthermore, five recesses 70 are arranged in a row in the length direction on the upper surface of each connecting portion 154B, with the longitudinal direction being the width direction.

[0174] In this modified example, multiple main reinforcing bars 64 (for example, five on each side) are arranged on one widthwise side and the other widthwise side of the main body 154, and a portion of the connection portion 64B is exposed inside the recess 70 provided in the connection portion 154B.

[0175] In this modified example, a plurality of main reinforcing bars 80 (for example, five each) are arranged on each of one widthwise side and the other widthwise side of the main body 72 of the lower central floor board block 54.

[0176] The central floor panel portion 150 is connected to the additional floor panel portion 48 located on one widthwise side of the central floor panel portion 150 and the additional floor panel portion 48 located on the other widthwise side of the central floor panel portion 150 via joint members 138 and 140.

[0177] According to such a configuration, the supporting force of the piles 28 can be more secure, while the weight of the foundation 10 can be more secure.

[0178] In this modified example, two additional floor plate sections 48 and two piles 28 are added to the foundation 10 of the first embodiment, but it is also possible to adopt a configuration in which one additional floor plate section 48 and one pile 28 are added depending on the specifications of the tower 12 and the location where the tower 12 is to be erected, etc.

[0179] <Second embodiment> Hereinafter, a tower foundation structure according to the second embodiment of the present invention will be described with reference to Figures 24 to 26. Note that the same components as those in the above-mentioned first embodiment are given the same reference numbers and the description thereof will be omitted.

[0180] The "tower foundation 160 (hereinafter simply referred to as the foundation 160)" according to this embodiment is basically configured similarly to the foundation 10 according to the first embodiment, but is characterized in that it does not include piles 28 and that the "additional deck section 162" is connected to an "upper additional deck block 164" and a "lower additional deck block 166" by fastening members. In other words, the foundation 160 is configured as a spread foundation.

[0181] Specifically, the upper additional deck block 164 is composed of a main body 168 made of precast concrete which forms the main part of the block, a plurality of second upper reinforcements, i.e., "reinforcement bars 170" embedded in the main body 168, and a plurality of reinforcing bars 172.

[0182] The main body portion 168 has a rectangular parallelepiped shape similar to that of the main body portion 102 of the upper additional floor board block 98. The main body portion 168 has a plurality of guide holes 174 formed therein.

[0183] The guide hole portions 174 are arranged on the upper surface of the main body portion 168 in four rows in the width direction and two rows in the length direction, and are composed of a countersunk portion 174A that forms the upper part in the height direction, and a through portion 174B that forms the part below the countersunk portion 174A in the height direction.

[0184] The countersunk portion 174A is circular when viewed in the height direction and is recessed downward in the height direction, and the through portion 174B is provided by the main body 168 penetrating from the bottom of the countersunk portion 174A downward in the height direction.

[0185] In addition, on the underside of the main body 168, a plurality of (for example, five) "protrusions 168A" are formed at intervals in the length direction as first protrusions that extend in the width direction and protrude downward in the height direction.

[0186] The reinforcing bars 170 are made of deformed steel bars, and a plurality of reinforcing bars (five bars, for example) are arranged at predetermined intervals in the width direction. The reinforcing bars 170 include a lengthwise reinforcing portion 170A extending in the length direction in the upper portion of the height direction of the main body portion 168, and a heightwise reinforcing portion 170B extending downward in the height direction from a portion of the lengthwise reinforcing portion 170A opposite to the central floor panel portion 46.

[0187] The portion of the longitudinal reinforcement portion 170A facing the central floor panel portion 46 is exposed from the main body portion 168, and this portion is connected to the central floor panel portion 46 via a joint member 138, similar to the upper additional floor panel block 98 in the first embodiment.

[0188] On the other hand, the reinforcing bar 172 is made of a deformed steel bar, and five of them are arranged at a predetermined interval in the longitudinal direction. When viewed from the longitudinal direction, the reinforcing bar 172 is bent into a U-shape with an open lower side in the height direction, and is fixed to the reinforcing bar 170 by a tie wire or the like (not shown).

[0189] The lower additional deck block 166 is composed of a precast concrete main body 178 which forms the main part of the block, "reinforcement bars 180" serving as a plurality of second lower reinforcement bars embedded in the main body 178, a plurality of reinforcing bars 182, and a plurality of connecting portions 184.

[0190] The main body 178 is a rectangular parallelepiped shaped similar to the main body 116 of the lower additional floorboard block 100. A plurality of (for example, five) "protrusions 178A" are formed on the upper surface of the main body 178 at intervals in the length direction as second protrusions that extend in the width direction and protrude upward in the height direction. The protrusions 178A are engaged with the protrusions 168A. In other words, in this embodiment, the protrusions 168A and the protrusions 178A function as first limiting parts.

[0191] The reinforcing bars 180 are made of deformed steel bars, and a plurality of reinforcing bars (five bars, for example) are arranged at predetermined intervals in the width direction. The reinforcing bars 180 include a lengthwise reinforcing portion 180A extending in the length direction in a lower portion of the height direction of the main body portion 178, and a heightwise reinforcing portion 180B extending upward in the height direction from a portion of the lengthwise reinforcing portion 180A opposite to the central floor panel portion 46.

[0192] The portion of the longitudinal reinforcement portion 180A facing the central floor panel portion 46 is exposed from the main body portion 178, and this portion is connected to the central floor panel portion 46 via a joint member 140, similar to the lower additional floor panel block 100 of the first embodiment.

[0193] On the other hand, reinforcing bar 182 is made of a deformed steel bar, and a plurality of reinforcing bars (five bars, for example) are arranged at a predetermined interval in the longitudinal direction. Reinforcing bar 182 is bent into a U-shape with an open upper side in the height direction when viewed from the longitudinal direction, and is fixed to reinforcing bar 180 with a tie wire (not shown).

[0194] Next, a description will be given of the configuration of the connecting portion 184. This connecting portion 184 is configured to include a head member 186 arranged on the lower side in the height direction, and a shaft member 188 that configures the main portion thereof.

[0195] The head member 186 is made of a rectangular steel plate, with the plate thickness direction being the height direction, and is fixed to the reinforcing bar 180 from below in the height direction with a tie wire (not shown). In addition, a female screw portion (not shown) is provided in the center of the head member 186.

[0196] The head member 186 may be made of other polygonal plate-like or disc-like steel material, or may be made of a member such as a nut.

[0197] The shaft member 188 is made of a threaded bar steel and extends in the height direction, with its lower end screwed into the head member 186. The lower portion of the shaft member 188 in the height direction is embedded in the main body 178, and the upper portion in the height direction extends upward in the height direction from the main body 178. In addition, when the upper additional floor plate block 164 is stacked on the lower additional floor plate block 166, the shaft member 188 is inserted into the guide hole portion 174 of the upper additional floor plate block 164.

[0198] A nut 190 is fastened to the upper portion of the shaft member 188 in the height direction, and the nut 190 is pressed against the countersunk portion 174A of the guide hole portion 174, so that a predetermined tension is generated in the shaft member 188. That is, in this embodiment, the connecting portion 184 and the nut 190 function as a second limiting portion. Note that a grout material such as mortar or concrete is poured into the gap between the guide hole portion 174 and the connecting portion 184.

[0199] According to this configuration, the additional floor panel section 162, which is rectangular when viewed from the height direction and whose main portion is made of precast concrete, is positioned adjacent to the central floor panel section 46 in the longitudinal direction and is connected to the central floor panel section 46.

[0200] In this embodiment, the protrusions 168A and 178A limit the relative displacement in the length direction between the upper additional floor plate block 164 and the lower additional floor plate block 166. The connecting portion 184 and the nut 190 limit the relative displacement in the height direction between the upper additional floor plate block 164 and the lower additional floor plate block 166.

[0201] Therefore, this embodiment also provides the same effects and advantages as the first embodiment described above, except for the effects and advantages provided by the piles 28. Furthermore, in this embodiment, the upper additional floor plate block 164 and the lower additional floor plate block 166 can be connected in the height direction without using reinforcing bars provided in the piles, so that the foundation 160 can be installed directly on the installation ground 25 when the installation ground 25 has a hard ground that can be used as a support layer.

[0202] <Supplementary explanation of the above embodiment> (1) In the first embodiment described above, the piles 28 were made of steel pipes. However, depending on the condition of the installation ground 25, etc., the piles 28 may be made of concrete and the anchor bars 44 may be used as the main pile bars.

[0203] (2) In addition, in the second embodiment described above, two additional floor panel portions 162 were arranged on the central floor panel portion 46. However, by applying the modified example of the first embodiment described above, it is also possible to adopt a configuration in which an additional floor panel portion 162 is added to the central floor panel portion 46.

[0204] (3) In the above-described embodiment, the central deck section and the additional deck section are divided in the height direction, but it is also possible to adopt a configuration in which at least one of the central deck section and the additional deck section is not divided in the height direction, depending on the specifications of the tower 12. It is also possible to appropriately adopt a configuration in which the number of divisions in the height direction of the central deck section and the additional deck section is greater than two.

[0205] (4) In addition, in the above-described embodiment, a configuration was adopted in which the additional deck plate portion was connected to the central deck plate portion 46, but it is also possible to adopt a configuration in which the additional deck plate portions are connected to each other depending on the specifications of the tower 12, etc.

[0206] (5) In addition, in the above-described embodiment, the reinforcing bars on the central deck section side and the reinforcing bars on the additional deck section side were connected by joint members 138 and 140. However, depending on the specifications of the tower 12, it is also possible to adopt a configuration in which these reinforcing bars are connected by joints formed by welding or the like. [Explanation of symbols]

[0207] 10. Tower Foundation 12 Steel Tower 22 Steel frame leg 24 Leg material 24A end 25 Installation ground 26 Inner Piece 28 stake 44 Fixation muscle 46 Central floor panel 48 Additional floor plate section 50 Lower intermediate block 52 Upper center floor block 54 Lower center floor block 64 Main reinforcement (first upper reinforcement) 80 Main reinforcement (first lower reinforcement) 86 Inner penetration 88 Column main rebar (main rebar) 96 Medial interposition 98 Upper additional floor block 100 Lower additional floor block 102C Projection (1st projection) 108 Main reinforcement (second upper reinforcement) 112 Recess 116B Projection (second projection) 122 Main reinforcement (second lower reinforcement) 126 Recess 130 Outer penetration 132 First Restriction 134 Lateral intervening part 136 Second Restriction Section 138 Joint member (first joint part) 140 Joint member (second joint part) 142 Groove 150 Central floor panel 152 Upper center floor block 160 Tower Foundation 162 Additional floor plate section 164 Upper additional floor block 166 Lower additional floor block 168A Protrusion (1st protrusion) 170 Reinforcement (Second upper reinforcement) 178A Projection (second projection) 180 Reinforcement (Second Lower Reinforcement)

Claims

1. A leg member that constitutes part of the steel leg of the steel tower; An inner piece made of precast concrete integrally provided with the end portion of the leg member on the lower side in the height direction of the steel tower; a central floor panel portion having an inner penetration portion formed in a rectangular shape when viewed from the height direction and surrounding the inner piece, and a main portion of the central floor panel portion being made of precast concrete; an inner intermediate portion made of concrete interposed between the inner piece and an inner circumferential surface of the inner penetration portion; an additional floor panel section arranged adjacent to the central floor panel section in a direction perpendicular to the height direction, having a rectangular shape when viewed from the height direction, a main portion of which is made of precast concrete, and connected to the central floor panel section; A steel tower foundation structure having the above structure.

2. The central floor plate portion is an upper center floor board block constituting the upper portion in the height direction; A lower center floor block constituting the lower portion in the height direction; The present invention relates to a method for manufacturing a computer-implemented ... The upper central floor block and the lower central floor block are formed in a vertical direction, and the upper central floor block and the lower central floor block are formed in a vertical direction. The upper central floor block and the lower central floor block are formed in a vertical direction. The tower foundation structure according to claim 1.

3. The additional floor plate portion is An upper additional floor plate block constituting the upper portion in the height direction; A lower additional floor plate block constituting the lower portion in the height direction; The present invention relates to a method for manufacturing a computer-implemented ... A first limiting portion that limits relative displacement between the upper additional floor board block and the lower additional floor board block in a connecting direction between the central floor board portion and the additional floor board portion; A second limiting portion that limits the relative displacement between the upper additional floor board block and the lower additional floor board block in the height direction; Further comprising The tower foundation structure according to claim 2.

4. A first upper reinforcing bar, the main portion of which is embedded in the upper central floor block and a portion of which extends from the upper portion of the upper central floor block in the height direction toward the upper additional floor block; A first lower reinforcing bar, the main portion of which is embedded in the lower central floor block and a portion of which extends from a lower portion of the lower central floor block in the height direction toward the lower additional floor block; A second upper reinforcement having a main portion embedded in the upper additional floor plate block and a portion extending from the upper portion of the upper additional floor plate block in the height direction toward the upper central floor plate block; A second lower reinforcement having a main portion embedded in the lower additional floor plate block and a portion extending from a lower portion of the lower additional floor plate block in the height direction toward the lower central floor plate block; A first joint portion connecting the first upper reinforcement bar and the second upper reinforcement bar; A second joint portion connecting the first lower reinforcement and the second lower reinforcement; Further comprising The tower foundation structure according to claim 3.

5. The lower intermediate block is disposed between the lower central floor plate block and the lower additional floor plate block, and has a groove formed therein into which the second joint portion fits from below in the height direction. The tower foundation structure according to claim 4.

6. The first limiting portion is A first protrusion portion is provided on a lower surface of the upper additional floor board block in the height direction and extends in a direction perpendicular to the connecting direction; A second protrusion is provided on the upper surface of the lower additional floor board block in the height direction, extends in a direction perpendicular to the connecting direction, and is engageable with the first protrusion; The invention is configured to include The tower foundation structure according to claim 5.

7. The additional floor plate portion is disposed in plurality with respect to the central floor plate portion, An outer through-hole is formed in the additional floor plate portion in the height direction, and a plurality of recesses are formed on an inner peripheral surface of the outer through-hole along a circumferential direction of the outer through-hole, Further, a pile is embedded in the installation ground below the additional floor plate portion in the height direction, The second limiting portion is A plurality of anchoring bars extending upward from the pile in the height direction and arranged along the circumferential direction of the outer penetration portion when viewed from the height direction; An outer intermediate portion made of concrete filled in the outer penetration portion and having the anchoring reinforcement embedded therein. The tower foundation structure according to claim 6.

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