Structures

Abstract

To provide a structure and the like which has good workability, and which can perform highly accurate quality control.SOLUTION: In a structure 1, an outer surface is inclined in a curved manner protruding to the outside toward a top end and a bottom end, and a space is provided inside. An upper skeleton 3 and a lower skeleton 2 of the structure 1 are constructed by precast members 21, respectively. The lower skeleton 2 has a rigid-framed structure by a beam part 6 and a column part 7 formed by the precast members 21. A precast member 31 of the upper skeleton 3 is arranged on the beam part 6 on the uppermost stage of the lower skeleton 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure and a method for constructing the same. [Background technology]

[0002] There are many known structures that have spherical bodies, such as hemispheres and full spheres, such as tanks and planetariums. A conventional method for constructing bodies with three-dimensional curved surfaces, such as spheres, or bodies with irregular surfaces of complex shapes, using reinforced concrete is to pour concrete between curved formwork installed inside and outside the structure. However, this method has problems such as delays in construction and increased costs for formwork.

[0003] To solve these problems with conventional construction methods, Patent Document 1 describes a method in which formed rebar truss units, the reinforcement of which is determined based on the results of structural analysis, are transported to the site, assembled, and concrete is poured between the wire mesh attached inside and outside the truss units. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6117527 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the method described in Patent Document 1 has poor workability because concrete slag can drip from the wire mesh inside the truss unit. In addition, when the exterior and interior surfaces of a structure are visible and design is required, plastering work is required on the interior and exterior surfaces, making it difficult to ensure precision and quality. Furthermore, when a structure has a complex shape, its design becomes difficult and structural calculations and confirmation applications take time and effort.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a structure etc. that allows for highly accurate quality control and is easy to design and construct. [Means for solving the problem]

[0007] The first invention for achieving the above-mentioned object is a structure having an outer surface that slopes in a curved shape that is convex outward toward the top and bottom ends and has an internal space, wherein each of the upper and lower frameworks of the structure is constructed from precast members, the lower framework has a rigid frame structure with beams and columns formed in the precast members, and the precast members of the upper framework are disposed on the beams of the lower framework. The beam portion and the column portion are formed so as to protrude into the space. The structure is characterized by the above.

[0008] In the structure of the present invention, the upper and lower frameworks are constructed from precast members, which allows for highly accurate quality control, shortens the construction period, provides excellent aesthetics, and is easy to construct. In addition, by making the lower framework a rigid frame structure consisting of beams and columns, and the upper framework a member supported by the rigid frame structure, it is possible to use existing structural calculations and the design is also simplified.

[0009] The second invention is a structure having an outer surface that slopes in a curved manner that is convex outward toward the top and bottom ends and has a space inside, wherein each of the upper and lower structures of the structure is constructed from precast members, the lower structure has a rigid frame structure with beams and columns formed from the precast members, the precast members of the upper structure are placed on the beams of the lower structure, The beam portion is formed by providing, inside a precast member, main reinforcement in the circumferential direction of the structure and a plurality of stirrup reinforcements arranged at intervals in the circumferential direction, and the column portion is formed by providing, inside a precast member, main reinforcement in the meridian direction of the structure and a plurality of hoop reinforcements arranged at intervals in the meridian direction. It is a structure characterized by . This allows the interior space of the structure to be utilized to the maximum extent possible.

[0011] A third invention is a structure having an outer surface that slopes in a curved manner that is convex outward toward the top and bottom ends and has a space inside, wherein each of the upper and lower structures of the structure is constructed from precast members, the lower structure has a rigid frame structure with beams and columns formed from the precast members, the precast members of the upper structure are placed on the beams of the lower structure,The planar surface of the structure is circular, the upper body and the lower body are constructed by arranging a plurality of precast members in the circumferential direction of the structure, reinforcing bars are provided inside the precast members in the circumferential direction, the reinforcing bars are arranged along a curvature in the plane of the precast members in the circumferential intermediate portion of the precast members, the ends of the reinforcing bars protrude linearly from the ends of the precast members in the circumferential direction, and the ends of the reinforcing bars of adjacent precast members in the circumferential direction are connected between the adjacent precast members in the circumferential direction. It is a structure characterized by . This makes it possible to easily connect the reinforcing bars of adjacent precast members in the circumferential direction of the structure, and to easily perform the joining.

[0012] It is desirable that the structure have a precast top structure placed on the upper structure, and that concrete be poured between the top structure and the upper structure to integrate them. This allows the top frame to close the top end of the structure and connect the top frame to the upper frame. It is possible to integrate the two while maintaining water-stopping properties. Effect of the Invention

[0013] According to the present invention, highly accurate quality control is possible, and structures and the like that are easy to design and construct can be provided. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing an overview of structure 1. [Diagram 2] Top view of structure 1. [Diagram 3] A diagram showing the joint between the foundation beam 10 and the precast member 21-1, and the column portion 7 of the precast member 21-1. [Figure 4] A diagram explaining the joint between the foundation beam 10 and the precast member 21-1. [Diagram 5] A diagram showing the joint between precast members 21-1 and 21-2. [Figure 6] A diagram showing the joint between precast members 21-2 and 31. [Figure 7] A diagram showing the joint between the precast member 31 and the top body 4. [Figure 8]A diagram showing the joint between precast members 21, 31 adjacent to each other in the circumferential direction of the structure 1. [Figure 9] FIG. 2 is a diagram showing a method for constructing structure 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0016] (1. Structure 1) Fig. 1 is a diagram showing an overview of a structure 1 according to an embodiment of the present invention. Fig. 1(a) is an elevation view of the structure 1, and Fig. 1(b) is a vertical cross-sectional view of the structure 1. Fig. 2 is a view of the structure 1 as seen from above.

[0017] The structure 1 is a spherical structure with an internal space, and has a circular plane. The outer surface of the structure 1 is spherical, and slopes in a curved shape that is convex outward toward the top and bottom ends. The structure 1 is, for example, a facility such as a planetarium, and slabs, columns, and the like (not shown) are also provided in the internal space. However, the use of the structure 1 is not particularly limited, and it can also be used as a tank or other storage facility.

[0018] The structure 1 is divided from the bottom to the top into a lower body 2, an upper body 3, and a top body 4, and these bodies are made of precast concrete members fabricated in advance in a factory, etc. If there is enough space on the site, the precast members may be manufactured on site.

[0019] The lower structure 2 is constructed by arranging a number of precast members 21 in the circumferential direction of the structure 1. The precast members 21 are provided in two layers, an upper and lower layer, with the precast member 21-1 in the lower layer 2-1 being placed on the foundation beams 10, and the precast member 21-2 in the upper layer 2-2 being placed on the precast member 21-1 in the lower layer 2-1. The precast members 21-1 and 21-2 have shapes that divide the lower layer 2-1 and the upper layer 2-2 of the lower structure 2 equally in the circumferential direction, respectively.

[0020] The upper structure 3 is placed on the lower structure 2, and is provided above the equator of the structure 1. Like the lower structure 2, the upper structure 3 is constructed by arranging a plurality of precast members 31 in the circumferential direction of the structure 1. The precast members 31 are placed on top of the precast members 21-2 on the upper layer 2-2 of the lower structure 2.

[0021] The precast members 31 are shaped by equally dividing the upper structure 3 in the circumferential direction. The number of divisions (the number of precast members 31) is the same as that of the lower structure 2, but may be different from that of the lower structure 2. For example, it may be less than that of the lower structure 2. In any case, the number of divisions is determined taking into consideration the manufacturing, transportation, and construction aspects of the precast members 21, 31. This also applies to the number of layers of the lower structure 2 and the upper structure 3. If there are no problems with the manufacturing, transportation, and construction aspects, it is possible to construct the lower structure 2 with a single layer of precast members 21 rather than multiple layers of precast members 21 on the top and bottom, and it is also possible to construct the upper structure 3 with multiple layers of precast members 31 on the top and bottom, taking into consideration the manufacturing, transportation, and construction aspects.

[0022] The top structure 4 is placed on top of the upper structure 3. The top structure 4 is a disk-shaped precast member that is convex upward, and has a circular plane as shown in Fig. 2. It has excellent water-tightness because it is not divided in the circumferential direction of the structure 1 like the lower structure 2 and upper structure 3. The top structure 4 is provided with an annular gap between it and the upper structure 3, and the top structure 4 is integrated with the upper structure 3 by pouring concrete 5 into the gap.

[0023] (2. Beam 6 and column 7) In this embodiment, the lower structure 2 is constructed as a rigid frame structure with RC earthquake-resistant walls. Therefore, the precast members 21 of the lower structure 2 are formed with beams 6 and columns 7, and the portion surrounded by the beams 6 and columns 7 becomes a wall 8 (earthquake-resistant wall).

[0024] The beam portion 6 is provided in a ring shape along the circumferential direction of the structure 1. The beam portion 6 is provided at a height corresponding to the upper and lower ends of the precast members 21-1, 21-2 of each of the layers 2-1, 2-2, and portions constituting the beam portion 6 are formed in each of the multiple precast members 21-1, 21-2 lined up in the circumferential direction of the structure 1.

[0025] In addition, the beam portion 6 is also provided at a height corresponding to the lower end portion of the precast member 31 of the upper body 3, and portions constituting the beam portion 6 are also formed in each of the multiple precast members 31 arranged circumferentially around the structure 1.

[0026] The column portions 7 are provided in the meridian direction of the structure 1 across the upper and lower layers 2-1, 2-2 of the lower structure 2. The column portions 7 are arranged at intervals in the circumferential direction of the structure 1, and portions constituting the column portions 7 are formed in some of the precast members 21-1, 21-2 among the multiple precast members 21-1, 21-2 lined up in the circumferential direction of the structure 1.

[0027] As described above, the lower structure 2 has a rigid frame structure with beams 6 and columns 7, while the upper structure 3 and top structure 4 are constructed as slabs supported by a rigid frame structure. Therefore, the columns 7 are not provided on the upper structure 3 or top structure 4. The beams 6 are exceptionally provided only on the lower ends of the precast members 31, as described above.

[0028] Fig. 3(a) shows the joint between the foundation beam 10 and the precast member 21-1, and Fig. 3(b) shows a cross section of the precast member 21-1 in the wall thickness direction shown by the line aa in Fig. 3(a). Fig. 3(a) shows an enlarged view of the range B1 in Fig. 1(b).

[0029] As shown in Fig. 3(a), the beam section 6 is a portion formed by providing beam main reinforcement bars 61 and stirrup reinforcement bars 62 inside the precast member 21-1. The lower end of the precast member 21-1 is formed so as to protrude inward, and the beam section 6 is provided on this protruding portion. Note that "inside" refers to the center side of the structure 1, and the opposite side is referred to as "outside."

[0030] The beam main reinforcements 61 are reinforcing bars that continue in the circumferential direction of the structure 1 (corresponding to the normal direction to the paper surface of FIG. 3(a)), and multiple reinforcing bars are arranged in the cross section of the beam section 6 shown in FIG. 3(a). The stirrup reinforcements 62 are reinforcing bars that are provided so as to surround the multiple beam main reinforcements 61. Multiple stirrup reinforcements 62 are arranged at intervals in the circumferential direction of the structure 1.

[0031] As shown in Fig. 3(b), the column section 7 is a section formed by providing column main reinforcements 71 and hoop reinforcements 72 inside the precast member 21-1. The column main reinforcements 71 are reinforcing bars that run continuously in the meridian direction of the structure 1 (corresponding to the normal direction to the paper surface of Fig. 3(b)), and multiple reinforcing bars are arranged in the cross section of the column section 7 shown in Fig. 3(b). The hoop reinforcements 72 are reinforcing bars that are arranged to surround the multiple column main reinforcements 71. Multiple hoop reinforcements 72 are arranged at intervals in the meridian direction of the structure 1.

[0032] The wall thickness of the precast member 21-1 itself is the same between the column portion 7 and the other portions (wall portion 8), and the column portion 7 of the precast member 21-1 is determined by the arrangement of the rebar.

[0033] Reference numerals 81 and 82 in Fig. 3(b) denote vertical wall reinforcements and horizontal wall reinforcements of the wall portion 8. The vertical wall reinforcements 81 are reinforcing bars in the meridian direction of the structure 1, and multiple pieces are arranged at intervals in the circumferential direction of the structure 1. The horizontal wall reinforcements 82 are reinforcing bars in the circumferential direction of the structure 1, and multiple pieces are arranged at intervals in the meridian direction of the structure 1. The vertical wall reinforcements 81 and horizontal wall reinforcements 82 are provided in two rows, one inside and one outside, within the precast member 21-1.

[0034] As shown in Fig. 3(a), the lower end 711 of the column main reinforcement 71 is embedded between the stirrup reinforcements 62 arranged in the circumferential direction of the structure 1 in the beam section 6. The lower end 711 is bent inward and fixed to the concrete of the beam section 6. The same applies to the lower end of the wall vertical reinforcement 81.

[0035] (3. Joining of foundation beam 10 and precast member 21-1) As shown in Fig. 3(a) above, joint bars 11a and joint members 12 are also embedded between the stirrup bars 62 of the beams 6 arranged in the circumferential direction of the structure 1. The joint bars 11a and joint members 12 are members for joining the precast member 21-1 to the foundation beam 10, and the lower end of the joint bar 11a is inserted into the upper end of the tubular joint member 12. The lower surface of the joint member 12 is exposed on the lower surface of the precast member 21-1, and the upper end of the joint bar 11b protruding from the upper surface of the foundation beam 10 is inserted into the lower end of the joint member 12.

[0036] The joint bars 11a are provided in two rows, one inside and one outside. The upper end of the inner joint bar 11a-1 is bent outward into an L-shape and fixed to the concrete of the beam section 6. The upper end of the outer joint bar 11a-2 is bent inward into an L-shape and similarly fixed to the concrete of the beam section 6. The inner and outer joint bars 11a-1, 11a-2 are arranged with their positions shifted in the circumferential direction of the structure 1. The above is also true for the joint bars 11b of the foundation beam 10, but the joint bars 11b are fixed by bending the lower end of the inner joint bar 11b-1 outward into an L-shape and bending the lower end of the outer joint bar 11b-2 inward.

[0037] The upper surface of the foundation beam 10 and the lower surface of the precast member 21-1 are finished to be approximately horizontal, and a joint 14 is provided between them. The joint 14 is formed by filling a filler between the inner and outer sealing materials S1 provided with mortar or the like. Mortar or the like is used as the filler.

[0038] In this embodiment, the precast member 21-1 is hung vertically downward as shown by the arrow b in Fig. 4(a) and, as shown in Fig. 4(b), placed on the sealing material S1 on the upper surface of the foundation beam 10 so that the upper ends of the joint reinforcement 11b are inserted into the joint member 12. After that, a filler such as mortar is injected into the joint member 12 from the injection port 13a of the precast member 21-1.

[0039] The filler is filled inside the joint member 12, and at the same time, flows out from the joint member 12 into the gap between the upper surface of the foundation beam 10 and the lower surface of the precast member 21-1, filling said gap. The worker confirms that the filler is being discharged from the discharge port 13b of the precast member 21-1 and completes the filling work. The injection port 13a and the discharge port 13b are formed in advance in the precast member 21-1 so as to reach the joint member 12 from the inner surface of the precast member 21-1.

[0040] By the above-mentioned filling work, the joint reinforcements 11a, 11b are connected by the coupling member 12, and a joint portion 14 made of filling material is formed in the gap between the upper surface of the foundation beam 10 and the lower surface of the precast member 21-1, thereby joining the foundation beam 10 and the precast member 21-1.

[0041] In this embodiment, the precast member 21-1 is hung vertically downward and set in place, making construction easy. In addition, since the installation surface of the precast member 21-1 is approximately horizontal, the precast member 21-1 is highly stable when installed, and only a small amount of support material (not shown) is required to support the precast member 21-1.

[0042] (4. Joining of precast members 21-1 and 21-2) FIG. 5 is a diagram showing the joints between the precast members 21-1, 21-2 of the upper and lower layers 2-1, 2-2 of the lower structure 2, and is an enlarged view of the range B2 in FIG. 1(b).

[0043] As shown in FIG. 5, the upper end of the precast member 21-1 is thicker than the portion below it, and the beam portion 6 at the upper end of the precast member 21-1 is provided in this thickened portion.

[0044] The lower end of the precast member 21-2 is formed so as to protrude into the structure 1, and the beam portion 6 at the lower end of the precast member 21-2 is provided in this protruding portion. The inner surface of the protruding portion is flush with the inner surface of the thickened portion described above.

[0045] These beams 6 basically have the same configuration as the beams 6 at the lower ends of the precast members 21-1 described above. However, the shapes of the stirrups 62 differ depending on the shapes of the precast members 21.

[0046] The precast member 21-2 is also provided with the column 7, and the wall vertical reinforcement 81 and wall horizontal reinforcement 82. The lower ends of the column main reinforcement 71 and wall vertical reinforcement 81, as well as the joint reinforcement 11a and the joint member 12 are embedded in the beam 6 at the lower end of the precast member 21-2 in the same manner as described above, and the precast members 21-1 and 21-2 of the upper and lower layers 2-1 and 2-2 are joined in the same manner as described above. At this time, the joint reinforcement 11b inserted into the joint member 12 is embedded at the upper end of the precast member 21-1 between the stirrup reinforcement 62 of the beam 6 arranged in the circumferential direction of the structure 1. The upper ends of the column main reinforcement 71 and wall vertical reinforcement 81 are also embedded between the stirrup reinforcement 62.

[0047] (5. Joining of precast members 21-2 and 31) FIG. 6(a) is a diagram showing the joint between the precast member 21-2 of the lower structure 2 and the precast member 31 of the upper structure 3, and is an enlarged view of the range B3 of FIG. 1(b).

[0048] Reference numerals 91 and 92 in Fig. 6(a) denote slab vertical bars and slab horizontal bars, which are reinforcing bars for the precast member 31. The slab vertical bars 91 are reinforcing bars in the meridian direction of the structure 1, and multiple bars are arranged at intervals in the circumferential direction of the structure 1. The slab horizontal bars 92 are reinforcing bars in the circumferential direction of the structure 1, and multiple bars are arranged at intervals in the meridian direction of the structure 1. The slab vertical bars 91 and slab horizontal bars 92 are arranged in two rows, one inside and one outside, within the precast member 31.

[0049] As shown in FIG. 6(a), the upper end of the precast member 21-2 is slightly thicker than the portion below it, and the beam portion 6 at the upper end of the precast member 21-2 is provided in this thickened portion.

[0050] The lower end of the precast member 31 is formed to slightly protrude into the structure 1, and the beam portion 6 at the lower end of the precast member 31 is provided in this protruding portion. The inner surface of the protruding portion is flush with the inner surface of the thickened portion described above.

[0051] These beams 6 are basically configured in the same manner as the beams 6 described above. However, the shape of the stirrup reinforcement bars 62 differs depending on the shapes of the precast members 21, 31.

[0052] At the lower end of the precast member 31, the joint reinforcements 11a and the coupling members 12 are embedded between the stirrup reinforcements 62 of the beams 6 aligned in the circumferential direction of the structure 1, together with the lower ends of the slab vertical reinforcements 91, in the same manner as described above. At the upper end of the precast member 21-2, the joint reinforcements 11b are embedded between the stirrup reinforcements 62 of the beams 6 aligned in the circumferential direction of the structure 1, together with the upper ends of the column main reinforcements 71 and the wall vertical reinforcements 81.

[0053] The procedure for joining precast members 21-2 and 31 is basically the same as above, but in the example of Figure 6(a), the underside of precast member 31 and the top side of precast member 21-2 are finished at an angle, and precast member 31 is not hung vertically downward as described in Figure 4(a), but is positioned by moving it diagonally downward as shown by arrow c.

[0054] It is also possible to place precast member 31 by suspending it vertically downward with the bottom surface of precast member 31 and the top surface of precast member 21-2 approximately horizontal, but in this case, it is necessary to make the thickening width at the top end of precast member 21-2 and the overhang length at the bottom end of precast member 31 extra large, as shown in a simplified manner in Figure 6(b). In this embodiment, precast member 31 does not have columns 7 and reinforcement is simplified, so that even if the installation surface of precast member 31 is inclined, it can be sufficiently stabilized with a small amount of support material (not shown).

[0055] In the precast member 31, the injection port 13a and the discharge port 13b are formed so as to reach the joint member 12 from the outer surface of the precast member 31. This allows the filling work to be performed from the outside of the structure 1, improving workability.

[0056] (6. Joining of precast member 31 and top structure 4) FIG. 7(a) is a diagram showing the joint between the precast member 31 of the upper structure 3 and the top structure 4, and is an enlarged view of the range B4 in FIG. 1(b).

[0057] As described above, the precast members 31 of the upper structure 3 and the top structure 4 are integrated by pouring concrete 5 into the gap between them. In the concrete 5, the ends of the slab vertical reinforcements 91 protruding from the precast members 31 are embedded, and the anchor reinforcements 94 protruding from the top structure 4 are also embedded.

[0058] The anchoring bars 94 are connected to the outer ends of the joint members 93 embedded in the top structure 4. The inner ends of the joint members 93 are connected to the ends of the slab vertical bars 91 embedded in the top structure 4.

[0059] When joining the precast members 31 of the upper structure 3 and the top structure 4, the top structure 4 is set with a gap from the precast members 31 as shown in Fig. 7(b), and then the anchor bars 94 are connected to the joint members 93 as shown in Fig. 7(c), and a gap lap joint is formed between the ends of the slab vertical reinforcement 91 protruding from the precast members 31 and the anchor bars 94. There is no particular limit to the joint method, but in a curved state such as the joint between the precast members 31 of the upper structure 3 and the top structure 4, a gap lap joint is the most efficient method of construction.

[0060] The top and bottom surfaces of the gap are then sealed with formwork (not shown), and concrete 5 is poured into the gap. For the top surface formwork, a steel formwork corresponding to the cross-sectional shape of the precast member 31 and the top body 4 is used, and by sealing the top surface of the gap with this formwork, plastering is not required and high-precision finishing quality can be ensured.

[0061] (7. Joining of circumferentially adjacent precast members 21 (31)) FIG. 8(a) is a diagram showing a joint between precast members 21 (precast members 21-1 or 21-2) adjacent to each other in the circumferential direction of the structure 1. FIG.

[0062] As shown in FIG. 8(a), at this joint, a notch 212 is formed on the inside of the end B in the circumferential direction of the structure 1 for both precast members 21 adjacent to each other in the circumferential direction of the structure 1.

[0063] At the joint between the precast members 21, ends of the wall cross bars 82 of both precast members 21 protrude into the space formed by the notches 212 of both precast members 21, and these ends are connected to each other by joint members 83. Concrete C, which is a filler, is poured and filled into the space. Reference symbol S2 denotes a sealing material, which is disposed between the thin-walled portions 213 located outside the notches 212 of both precast members 21.

[0064] The wall cross bars 82 are arranged in an arc shape following the curvature of the plane of the precast member 21 at the circumferential middle part A of the structure 1, and are arranged in a straight line at the circumferential end part B of the structure 1, protruding into the notch 212. In the range adjacent to the notch 212 of both precast members 21, thickened parts 211 (thickening) are provided so that the inner surface of the precast member 21 is parallel to the straight part of the wall cross bars 82, thereby ensuring the required wall thickness.

[0065] When joining precast members 21 adjacent to each other in the circumferential direction of the structure 1, as shown in Fig. 8(b), the ends of the wall cross bars 82 of both precast members 21 are connected by joint members 83 in the space formed by the notches 212. In addition, the sealing material S is placed on the outside of the precast members 21, and a formwork F that closes the space is installed inside the precast members 21. Due to the thickened portions 211, the plane of the formwork F can be linear, and there is no need to use a formwork that matches the curvature of the interior surface of the structure.

[0066] After the formwork F and the like have been installed, concrete C is poured and filled into the space from the top end side of the precast members 21, thereby joining adjacent precast members 21 in the circumferential direction of the structure 1.

[0067] The above has been an explanation of the joints between the precast members 21 of the lower structure 2, but the joints between the precast members 31 of the upper structure 3 adjacent in the circumferential direction of the structure 1 have the same configuration as in Fig. 8(a) except that the slab cross bars 92 are connected to each other by joint members 95, as shown in Fig. 8(c). However, since it is difficult to pour the concrete C from the top end side, as shown in Fig. 8(c), a core hole (through hole) 32 is made in the outer surface of the precast member 31, and the core hole 32 is used to pour the concrete C from the outside of the precast member 31. This makes it easier to construct the joints.

[0068] (8. How to build structure 1) Figure 9 is a diagram showing a method for constructing the structure 1. To construct the structure 1, first, as shown in Figure 9(a), a plurality of precast members 21-1 are arranged in a line in the circumferential direction of the structure 1 on the foundation beam 10. The joining of the foundation beam 10 and the precast members 21-1, and the joining of adjacent precast members 21-1 in the circumferential direction of the structure 1 are performed as described above, thereby constructing the lower layer 2-1 of the lower structure 2.

[0069] 9(b), a plurality of precast members 21-2 are arranged in the circumferential direction of the structure 1 on top of the beams 6 at the upper ends of the precast members 21-1 of the lower layer 2-1. The precast members 21-1 and 21-2 are joined together, and adjacent precast members 21-2 in the circumferential direction of the structure 1 are joined together as described above, thereby constructing the upper layer 2-2 of the lower structure 2.

[0070] Next, as shown in Fig. 9(c), a plurality of precast members 31 are arranged in the circumferential direction of the structure 1 on the beams 6 at the upper ends of the precast members 21-2 of the lower structure 2. The precast members 21-2, 31 are joined, and adjacent precast members 31 in the circumferential direction of the structure 1 are joined as described above, thereby constructing the upper structure 3.

[0071] Then, the top structure 4 is installed as shown in Figure 9(d), and concrete 5 is poured between the upper structure 3 and the top structure 4 as described above to integrate the top structure 4 with the upper structure 3, thereby constructing the structure 1.

[0072] As described above, according to this embodiment, the upper structure 3 and the lower structure 2 are constructed from precast members 21, 31, respectively, which enables highly accurate quality control, shortens the construction period, provides excellent aesthetics, and is easy to construct. In addition, by making the lower structure 2 a rigid frame structure consisting of beams 6 and columns 7 and making the upper structure 3 a member supported by the rigid frame structure, it becomes possible to use existing structural calculations and the design becomes easier.

[0073] In the structure 1, the beam section 6 and the column section 7 are formed by providing the main beam reinforcement 61, the stirrup reinforcement 62, the main column reinforcement 71 and the hoop reinforcement 72 inside the precast member 21, so that the internal space of the structure 1 can be utilized to the maximum extent.

[0074] Furthermore, the top structure 4 is made of a precast material and the upper structure 3 and the top structure 4 are integrated with cast-in-place concrete 5, ensuring watertightness when the top end of the structure 1 is closed with the top structure 4, making it easy to construct a high-quality structure 1.

[0075] In addition, in the precast members 21, 31, by having the ends of the wall cross bars 82 protrude linearly from the ends of the precast members 21, 31, the wall cross bars 82 of adjacent precast members 21, 31 in the circumferential direction can be easily connected to each other by joint members 83, eliminating the need for bending processing, etc. on site.

[0076] However, the present invention is not limited to the above embodiment. For example, the shape of the outer surface of the structure 1 is not limited to a spherical shape, but may be any shape that is curved and convex toward the top and bottom ends. For example, the shape of the outer surface of the structure 1 may be an egg shape, and precast members may be manufactured according to the shape. It is also possible to provide openings or the like in the portions of the structure 1 other than the beams 6 and columns 7.

[0077] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the technical ideas disclosed in this application, and it is understood that such examples also naturally belong to the technical scope of the present invention. [Explanation of symbols]

[0078] 1: Structure 2: Lower structure 3: Upper frame 4:Top body 5: Concrete 6:Beam part 7: Pillar part 8:Wall part 10: Foundation beam 11a, 11a-1, 11a-2, 11b, 11b-1, 11b-2: joint muscles 12: Joint material 21, 21-1, 21-2, 31: Precast members 61: Beam main reinforcement 62: Stirrup muscle 71:Column main reinforcement 72: Hoop muscle 81: Wall vertical line 82: Wall cross bar 83, 93, 95: Joint parts 91: Slab vertical reinforcement 92: Slab horizontal reinforcement 94: Fixation muscle

Claims

1. A structure having an outer surface that slopes in a curved shape that is convex outward toward the top and bottom ends and has a space inside, Each of the upper and lower bodies of the structure is constructed from precast members; The lower structure has a rigid frame structure with beams and columns formed of precast members, The precast members of the upper structure are disposed on the beams of the lower structure, A structure characterized in that the beam portion and the column portion are formed so as to protrude into the space.

2. A structure having an outer surface that slopes in a curved shape that is convex outward toward the top and bottom ends and has a space inside, Each of the upper and lower bodies of the structure is constructed from precast members; The lower structure has a rigid frame structure with beams and columns formed of precast members, The precast members of the upper structure are disposed on the beams of the lower structure, The beam portion is A main reinforcement in the circumferential direction of the structure; A plurality of stirrup strips spaced apart in the circumferential direction; is provided inside the precast member, The column portion is A main reinforcement in the longitudinal direction of the structure; A plurality of hoops spaced apart in the meridian direction; A structure formed by providing a precast member inside the structure.

3. A structure having an outer surface that slopes in a curved shape that is convex outward toward the top and bottom ends and has a space inside, Each of the upper and lower bodies of the structure is constructed from precast members; The lower structure has a rigid frame structure with beams and columns formed of precast members, The precast members of the upper structure are disposed on the beams of the lower structure, The structure has a circular planar surface, The upper structure and the lower structure are constructed by arranging a plurality of precast members in the circumferential direction of the structure, The circumferential reinforcing bar is provided inside the precast member, In the circumferential intermediate portion of the precast member, the reinforcing bar is arranged along a curvature in a plane of the precast member; The end of the reinforcing bar protrudes linearly from the circumferential end of the precast member; A structure characterized in that the ends of the reinforcing bars of circumferentially adjacent precast members are connected between the circumferentially adjacent precast members.

4. The structure has a precast top structure disposed on the upper structure; 4. A structure according to claim 1, wherein concrete is poured between the top body and the upper body to form an integrated structure.

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