JP3160686B2 - Tower structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-rise tower-like structure mainly composed of reinforced concrete and cables applied to a communication tower, an observatory, a symbol tower and the like.

[0002]

2. Description of the Related Art In general, as a tower-like structure such as a communication tower, an observatory, a symbol tower and the like, a structure mainly composed of a steel frame and reinforced concrete has already been known, and many structures have been constructed in various places.

[0003]

Incidentally, in the above-mentioned tower-like structure, the cross-sectional area of the column portion becomes large when the steel frame and the reinforced concrete are mainly used, so that a large amount of the steel frame and the reinforced concrete are required. ,
In addition, there has been a problem that the construction cost is high.

The present invention has been made in view of the above circumstances, and has as its object to realize a stable and inexpensive high-rise tower structure with a novel structure mainly composed of concrete and cables. And

[0005]

In order to achieve the above object, according to a first aspect of the present invention, a reinforced concrete shaft extending in a vertical direction, and a reinforced concrete shaft provided at regular intervals on the reinforced concrete shaft are provided with respect to a horizontal direction. A reinforced concrete structure having a plurality of protrusions projecting therefrom, and a number of cables provided so as to connect between peripheral edges of each protrusion of the reinforced concrete structure,
The projecting portion of the reinforced concrete structure has a projecting range in a horizontal direction from a reinforced concrete shaft,
It is set such that the upper side is reduced, each cable
Is provided so as to be twisted around the shaft as a whole.
And when viewed in plan, the periphery of the protrusion
At the point of contact with the edge, radially inward from the circumferential direction
It is characterized by being arranged in an inclined state.

In the second invention, the saddle portion of the cable connected to the projecting portion of the reinforced concrete structure is
It was arranged so as to be further expanded in a certain range with respect to the outside in the radial direction.

[0007]

According to a first aspect of the present invention, there is provided a reinforced concrete structure having a reinforced concrete shaft extending in a vertical direction and a plurality of protrusions provided at regular intervals on the reinforced concrete shaft and projecting in the horizontal direction. And a plurality of cables provided so as to connect between the peripheral edges of the protrusions of the reinforced concrete structure. Further, the protrusion of the reinforced concrete structure is connected to a reinforced concrete structure. The tower structure was configured so that the range of protrusion in the horizontal direction from the shaft was smaller on the upper layer side.In other words, in the present invention, a reinforced concrete shaft and protrusions constituting a reinforced concrete structure, The cable and the cable are connected stably in the space to form a tower structure. Compared to the tower structure composed mainly of over preparative, as a result, requires less steel and concrete use, construction cost is inexpensive. Further
In the present invention, the cable as a whole is
It is provided so that it can be twisted by the surrounding area,
To bend and twist in the overturning direction of the shaft
be able to. Furthermore, when the cable is viewed in plan
At the point of contact with the peripheral edge of the protrusion from the circumferential direction
Are also arranged to incline in the radial direction,
Acts radially inward on the protrusion from this contact
Compression force.

According to the second invention, the saddle portion of the cable connected to the protrusion of the reinforced concrete structure is
Since the cable is arranged so as to be further expanded to a certain extent with respect to the radially outward direction, thereby providing post tension to the cable, a prestress force is applied to the cable by this post tension, and further, By this prestressing force, a compressive force is introduced to the reinforced concrete shaft. When the compressive force is introduced to the reinforced concrete shaft in this manner, the bending strength of the reinforced concrete shaft in the overturning direction increases, thereby causing the reinforced concrete shaft to undergo an earthquake or wind load. The resistance to bending in the falling direction increases.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, the overall structure of the tower structure will be described with reference to FIG. 1. In this figure, reference numeral 1 denotes a reinforced concrete structure, reference numeral 2 denotes a cable stretched around the concrete structure, Code 3
Is a steel structure located at the tip of the reinforced concrete structure 1 and provided with, for example, an antenna, a pole and the like of a communication tower at the tip thereof.

The reinforced concrete structure 1 is provided along a vertical direction and has a concrete shaft 10 mainly composed of an RC wall, and is provided on the ground 11 to support a base end of the concrete shaft 10. Part 12
A first overhang 13 provided above the foundation 12 and in the middle of the concrete shaft 10, and over the first overhang 13 and the concrete shaft 1
0, and a third overhang 15 provided above the second overhang 14 and in the middle of the concrete shaft 10. Thus, the extent to which the base portion 12 and the overhang portions 13 to 15 extend outward from the concrete shaft 10 becomes smaller toward the upper layer.

As shown in FIG. 3, the concrete shaft 10 is arranged so as to form a square in a plane, and has four multipurpose shafts 16 to 19 each having a circular cross section. ~
19 and a connecting shaft 20 provided to connect the connecting shafts 19 to each other. The multi-purpose shaft 1
At the time of completion, facilities 21 such as air conditioning, power cables, water supply, drainage pipes, service elevators 22 for business use, and the like are provided in 6 to 19.
0 is provided with a view elevator 23 for carrying passengers at the time of completion.

Further, the base portion 12 and the overhang portions 13 to 15
The buttress 16 is arranged so that the concrete shaft 10 is disposed at the center, and the foundation 12 protrudes outward from the concrete shaft 10 in the horizontal direction.
A to 19A are provided, and the buttress base is further provided with a floor 24 which forms a horizontal plane as a whole. On the floor 24, for example, an elevating lobby, an observation room, a restaurant, and the like are provided.

Next, the cable 2 will be described. As shown in FIG. 1, the cable 2 connects a first portion 13 and a base portion 12 located on the ground 11.
Zone 26, a second zone 27 connecting the first overhang 13 and the second overhang 14, and a third zone 27 connecting the second overhang 14 and the third overhang 15 It is comprised of a zone 28. cable 2 in each zone 26 to 28, total
To twist around the concrete shaft 10 as a body
In the event of an earthquake or wind load.
Bending and twisting of the concrete shaft 10 in the falling direction
Can be resisted. Further, as shown in FIG.
As described above, the cable 2 has the first, second,
Connect to third overhangs 13, 14, 15 (see FIG. 1)
At the contact point N, it is inclined inward in the radial direction from the circumferential direction.
It is arranged in the state where it was. Therefore, the tension of the cable 2
By the force, the first, second, and third overhang portions 13, 14, 15
Compressive force acting radially inward from the contact point N
P can be given. Further, as described above, since the overhanging portions 13 to 15 have a smaller outwardly extending range toward the upper layer, each of the zones 26 to 2 connecting between them extends.
The cable 2 of No. 8 is arranged so as to spread downward. The connection position of the cable 2 with respect to the base portion 12 and the overhang portions 13 to 15 is a peripheral edge of the base portion 12 and the overhang portions 13 to 15. At the ground surface level, only the thin cables 2 are scattered around the outer periphery of the structure, so that the cables 2 do not become an obstacle in the architectural plan, and the structural restrictions in the design plan plan are reduced. I have.

When the cable 2 is constructed, as shown in FIGS.
At each of the positions 15, the saddle portion (indicated by reference numeral 13 a in FIG. 4A), which is a connection point with each of the overhang portions 13 to 15 as shown by an arrow a, is positioned radially outward. The cable 2 is post-tensioned so as to increase the bending and shear strength of the concrete shaft 10 in the overturning direction. That is, when a force is applied to the cable 2 in such a direction (indicated by an arrow a) (indicated by M in FIG. 4B), the prestressing force (an arrow in FIG. b), and a compressive force is applied to the concrete shaft 10 by the prestressing force. When the compressive force is introduced to the concrete shaft 10 in this manner, the bending strength of the concrete shaft 10 in the overturning direction increases,
Thereby, for example, the resistance to the bending of the concrete shaft 10 in the overturning direction at the time of an earthquake or wind load is increased, and as a result, the overall rigidity of the tower structure is also improved. Unless a prestress is introduced into the cable 2, no force acts on the compression side, and a force acts only in the tensile direction. However, when the prestress is introduced as described above, as long as the cable 2 has a tensile force, a compressive force acts, which contributes to securing the bending, shearing, and torsional rigidity of the reinforced concrete structure 1. Will be.

The method of applying a prestressing force to the cable 2 in this manner requires less force than the obtained prestressing force.
Are arranged symmetrically with respect to the concrete shaft 10 when viewed in a plan view as shown in FIG. 2, the concrete shaft 10 does not become unstable when the prestressing force is introduced. Thus, a stable compressive force can be applied to the concrete shaft 10. The reinforced concrete structure 1
Since the ratio of the cable occupied cross-sectional area of the cable 2 to the entire tower structure is very small, the cable 2 is hardly affected by wind. It can contribute to the conversion. Further, the overhang portion 13 of the reinforced concrete structure 1 is provided.
The saddle part of the cable 2 which is a connection point with
(Indicated by reference numeral 13a in (a)) is extended in a certain range in the radially outward direction, for example, by using a jack or the like. After the cable 2 is expanded, a hook member (not shown) is used. Be supported.

As described above, in the high-rise building shown in the above embodiment, the concrete shaft 1 extending in the vertical direction is used.
0, a base portion 12 provided at regular intervals on the concrete shaft 10 and projecting in the horizontal direction, an overhang portion 1
3 to 15, a reinforced concrete structure 1, a base portion 12, and an overhang portion 13 to 1 of the reinforced concrete structure 1.
And a plurality of cables 2 provided so as to connect between peripheral edges of the reinforced concrete structure 1. Further, the projecting portions 13 to 15 of the reinforced concrete structure 1 However, the tower structure was configured such that the upper layer side was reduced, that is, in the high-rise building, the concrete shaft 10, the foundation 12, the overhangs 13 to 15 constituting the reinforced concrete structure 1 were formed.
And a large number of cables 2 are connected stably in a space to form a tower structure. Compared with a conventional steel structure and a tower structure mainly made of concrete, as a result, In addition, the amount of reinforced concrete can be reduced, and the effect of reducing the construction cost can be obtained. Ma
In addition, the cable 2 as a whole is
Because it is arranged to be twisted in the surroundings,
Concrete shaft 10 during earthquake and wind load
Resistance to bending and twisting in the falling direction is possible.
-The structure can be stabilized. More cave
The first, second, and third overhangs when the
At the contact point N connected to 13, 14, 15 in the circumferential direction
It is arranged so that it is inclined more radially inward than
First, second, and third by the tension of the cable 2
Acts radially inward on overhangs 13, 14, 15
Compression force P can be given. For this reason,
The first, second and third overhangs 13, 14, 15 are
It can be made of reinforced concrete. Although not shown, the tower structure is provided with a vibration damping device on the steel structure 3.

[0017]

As is apparent from the above description, in the first invention, a concrete shaft and a projecting portion constituting a concrete structure and a large number of cables are stably connected in a space to form a tower structure. Because I composed things,
As a result, compared with the conventional tower structure mainly composed of steel frames and concrete, the steel structure and the reinforced concrete to be used can be reduced, and the construction cost can be reduced. In addition, the entire cable
Because it is arranged to twist around the ft, earthquake, wind load
Resistance to bending or twisting of the shaft
Can stabilize the tower structure.
Wear. Moreover, when the cable is viewed in plan,
At the contact point to the inner side in the radial direction than the circumferential direction
The cable tension.
Therefore, the compressive force acting radially inward on the protrusion
Can be given, and the protrusions can be reduced
It can be made in REIT.

According to the second aspect of the present invention, the saddle portion of the cable connected to the projecting portion of the concrete structure is disposed so as to be further extended to a certain extent outward in the radial direction. Since the post post tension is applied, the prestressing force is applied to the cable by the applied force, and the compressive force is introduced to the concrete shaft by the prestressed force. When the compressive force is introduced to the concrete shaft in this manner, the bending strength of the concrete shaft in the overturning direction is increased. Bending resistance is increased, and as a result, the effect of improving the overall rigidity of the tower structure is obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing the overall configuration of a tower structure.

2 (a)-(a), (b)-(b) of FIG.
(C) The top view along (c).

FIG. 3 is a plan view showing a base portion 12 and a first overhang portion 13 of FIG. 1;

FIG. 4 is an explanatory diagram when tension is applied to the cable 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforced concrete structure 2 Cable 3 Steel structure 10 Concrete shaft 11 Ground 12 Base part (projection part) 13 First overhang part (projection part) 13a Saddle part 14 Second overhang part (projection part) 15 Third overhang Part (projection) M Cable position after applying force

Continued on the front page (72) Inventor Akira Machii 2-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kazumi Yoshimura 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation In-company (56) References JP-A-2-213573 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 12/00 E04H 12/12-12/14

Claims (2)

(57) [Claims] 1. A reinforced concrete structure having a reinforced concrete shaft extending in a vertical direction, and a plurality of protrusions provided at regular intervals on the reinforced concrete shaft and projecting in the horizontal direction. A plurality of cables provided so as to connect between peripheral edges of each protrusion of the reinforced concrete structure, wherein the protrusions of the reinforced concrete structure extend in a horizontal direction from a reinforced concrete shaft. The protrusion range of
The upper layer is set to be smaller , and each cable is twisted around the shaft as a whole.
And when viewed in plan,
At the point of contact with the peripheral edge of the protrusion,
It is noted that the
Tower structure 2. A cable according to claim 1, wherein the saddle portion of the cable connected to the projecting portion of the reinforced concrete structure is further extended to a certain extent outward in the radial direction. 2. The tower structure according to 1.