JP7186915B1 - Hollow vertical bodies used to construct dome-shaped member networks - Google Patents

Abstract

The present invention relates to the construction of a dome-shaped member network according to Patent Documents 3 and 4, and is intended to simplify the construction of the dome to improve workability and economic efficiency, and to effectively use the height space of the dome. The task is to use The present invention solves two problems by providing a hollow vertical body (8) at the center of the dome. One is that the hollow vertical body 8 makes it possible to construct a dome-shaped member network with excellent workability and economic efficiency. It became easy and made it possible to effectively use the height space of the dome. [Selection drawing] Fig. 6

Description

The present invention proposes a new construction method for constructing a dome-shaped member network by forcibly deforming a straight member to construct a dome-shaped member network. , a method of constructing an intermediate floor in the shape of a plurality of perforated circles with a dome-shaped member network as the outer periphery.

When constructing a dome or dome-shaped structure, a method of constructing temporary scaffolding, shoring, and formwork on-site and pouring concrete, shortening the construction period, and reducing work in high places, etc. etc. to the construction site, set up temporary scaffolding and shoring at the construction site, lift various members with cranes, etc., and connect and combine them to construct (for example, See Patent Documents 1 and 2).

In such a conventional method, it is essential to manufacture and process a formwork for concrete placement and assembly members that match the shape of the dome to be constructed, but the methods of Patent Documents 3 and 4 are different from them. Completely different, by forcibly deforming linear members into an arch shape on site to construct a dome-shaped member network, it greatly reduces the use of heavy machinery such as temporary scaffolding, shoring, and cranes, and work in high places. However, since the construction of the dome-shaped member network is complicated, there is a fear that the construction cost will increase, and it is necessary to reduce the construction cost.

A feature of the dome-shaped structure is that the distance between the lower side and the upper side, that is, the upper space, becomes larger toward the center, and a baseball field is an example of effectively utilizing the feature of the large upper space. . On the other hand, in some cases high headroom is unnecessary or undesirable. There is a demand for a method of effectively utilizing the upper space in such a case.

Japanese Patent Laid-Open No. 11-06200 Japanese Patent Laid-Open No. 10-06101 Japanese Patent No. 6063086 Japanese Patent No. 6623331

The present invention relates to the construction of the dome-shaped member network according to Patent Documents 3 and 4, and aims to simplify the construction of the dome to improve workability and economic efficiency, and to effectively utilize the space above the dome-shaped structure. The task is to present a method to

When constructing a dome-shaped member network, the use of the permanent hollow vertical body of the present invention solves the problems of economic efficiency and effective utilization of upper space.

In Patent Document 3, the dome-shaped member net is formed by first radially arranging the straight members 2 on the foundation work 1 and locking the outer ends of the straight members 2 with the surrounding wire 4 to form a planar member net. (See the dashed line in Figure 1-Circle 1), and the intermediate part of this planar member network is raised by a temporary vertical support stand 6 installed in the substructure 7 to construct a convex member network (Figure 1-Circle 2 ), then reduce the diameter of this projecting member network, fix the ends of the straight members to the annular bearing 5, and construct a dome-shaped member network with a span L and a rise f (Fig. 1 - See the solid line in circle 3).

Here, the straight members 2 used to construct the dome network are half the length S0/2 of the arc length S0 of the dome network to be constructed. By horizontally fixing the inner end of the linear member 2 to the circular fixing plate 3, it is structurally regarded as one member having a length S0.

The linear member 2 used has a cross section with a height h and a width b shown in FIG. A high-strength steel material is used for the strong shaft 2a of the cross section used, but the weak shaft 2b is for increasing the rigidity, and usually the strength is lower than that of the strong shaft 2a. be done.

Unlike the process of Patent Document 3, the construction of the dome-shaped member network of the present application does not go through the process of forming the planar member network indicated by the dashed line in FIG. It starts with building a material network.

It starts with installing the permanent hollow vertical body 8, which is a component of the dome-shaped member network, on the substructure 9 (see FIG. 3). The height of the hollow vertical body 8 corresponds to the rise f of the dome-shaped member network (see FIG. 5(a)), its cross section is circular or rectangular (see FIG. 5(b)), and its size is circularly fixed. It corresponds to the diameter Δ of the plate 3 (see FIG. 4).

A circular fixed plate 3 (see FIG. 4) is arranged on the top of the hollow vertical body 8, and the inner ends of the plurality of linear members 2 constituting the dome-shaped member network are fixed to the circular fixed plate 3, The middle part of the linear member 2 is supported by a holding member 6e of one or more temporary vertical support bases 6, and the outer ends of the plurality of non-landing linear members 2 projecting to the outside are slidable in the surrounding direction. is free and locked by a surrounding wire 4 which cannot move radially. In this way, a convex member network is constructed (see the dashed line in FIG. 3-circle 2).

As shown in FIG. 7, the temporary vertical support base 6 is composed of two parallel plates 6a, a lower bottom plate 6b, an upper width stopper 6c, and a diagonal member 6d for holding the parallel plates 6 upright. ing. The linear member 2 passes through the U-shape of the parallel plate 6a and is supported by the holding member 6e. Lateral buckling of the straight member 2 in the diameter is prevented.

The straight member 2, whose inner ends and intermediate portion are restrained from lateral movement, is reduced in diameter. The diameter is reduced by applying a horizontal force ΣH to the end of the straight member 2 to pull the end of the straight member 2 toward the annular bearing 5 (see the dashed line in circle 2 in FIG. 3). The linear member 2 is separated from the holding member 6e of the vertical support base 6, becomes arch-shaped, and is fixed to the annular support 5, and a dome-shaped member network is constructed by a plurality of linear members 2 (see the solid line of circle 3 in FIG. 3).

At first glance, the construction method of the dome-shaped member network of the present application is similar to that of "Patent Document 4", but there is a big difference. It is proposed in "Patent Document 4" to provide a central support at the center of the dome, but the central support in "Patent Document 4" is temporary. On the other hand, the hollow vertical body 8 of the present application is not a temporary structure but a permanent structure of a dome-shaped member network.

Methods of diameter reduction include a method of tightening the encircling wire 4 and a method of drawing the outer end of the linear member 2 against the annular bearing 5 .

The non-landing end of the linear member 2 is attracted to the annular bearing 5 by the diameter reduction of the horizontal force .SIGMA.H=Hr. Hr is a forced horizontal force for deforming the linear member 2 into an arch shape. Due to the diameter reduction, the intermediate portion of the linear member 2 is separated from the holding member 6e of the vertical support base 6, and the end portion is fixed to the annular support 5 (see the solid line of circle 3 in FIG. 3).

When the end of the linear member 2 lands on the annular bearing 5, a horizontal force Hg is generated by the weight of the arch itself, and the diameter-reducing force ΣH rapidly increases to ΣH=Hr+Hg. The increased horizontal force ΣH is supported by the annular bearing 5 .

The annular support 5 must be able to bear not only the horizontal force ΣH=Hr+Hg due to the dome-shaped member network, but also the horizontal force generated by the dome-shaped structure constructed later, and prestressed concrete (PC) structure is mainly adopted. be done.

Generally, domes are mainly used for stadiums, baseball fields, etc. that require upper space. If an upper space is not required, a flat dome with a small rise is considered, but in reality, there are very few examples of dome use that do not require an upper space.

Demand for domes is expected to increase if the upper space can be used effectively.
The intermediate floor 11 (see FIG. 6(a)) of the present application is an example of effective utilization of the upper space, and is one of the major solutions. It is believed that the provision of the hollow vertical body 8 of the present application simplifies the construction of the intermediate floor 11 and promotes widespread use of the dome.

Without the hollow vertical body 8, the intermediate floor 11 has a circular structure with a diameter equal to the inner diameter of the dome, and the intermediate floor 11 is required to have a large bearing strength. In the present application, since the hollow vertical body 8 is provided at the center of the dome, the intermediate floor 11 has a perforated circular structure, and the bearing force required for the intermediate floor 11 is extremely small compared to when the hollow vertical body 8 is not provided. Since the hollow vertical body 8 reduces the structural strength required for the intermediate floor 11, the hollow vertical body works extremely effectively with respect to the workability and economic efficiency of the intermediate floor 11.

Although FIG. 6(a) shows a case where the intermediate floor is one layer, it is also possible to construct a dome with multiple layers as in FIG. 6(b).

As described above, the two problems of improving workability and economic efficiency in constructing a dome-shaped member network and effectively utilizing the space above the dome can be solved by providing the hollow vertical body 8 at the center position of the dome. .

The intermediate floor 11 is constructed as follows (see FIG. 8).
Intermediate portions of the linear members 2 of the dome-shaped member network are connected and fixed to each other by width stopping steels 21 . The width stopping steel 21 on the inner periphery of the dome and the projecting portion 81 on the outer periphery of the hollow vertical body 8 are connected by a plurality of support beams 111 (see the AA section of FIG. 8), and a plurality of fan-shaped slabs are mounted on the support beams 111. By laying and joining 112 (see cross section BB in FIG. 8), the perforated circular intermediate floor 11 is constructed. The supporting beams 111 and the fan-shaped slabs 112 are selected to have strength suitable for the intended use of the intermediate floor 11 .

In the structure of the intermediate floor 11, the width stopping steel 21 and the projecting portion 81 of the hollow vertical body 8 are directly integrated by the fan-shaped slab 112 without using the support beams 111 as described above.

FIG. 2 is an explanatory diagram of a construction process of a conventional landing-type dome-shaped member network; It is a cross section of a linear member. FIG. 4 is an explanatory diagram of a dome-shaped member network provided with hollow vertical bodies; It is explanatory drawing of a circular fixed plate. It is a side view and sectional drawing of a hollow vertical body. FIG. 4 is an explanatory diagram of a network of dome-shaped members provided with an intermediate floor; It is explanatory drawing of a vertical support base. It is explanatory drawing of an intermediate floor. FIG. 4A is a plan view and cross-sectional view of a network of domed members with hollow verticals; FIG. 11 is an illustration of an embodiment with a hollow vertical body and an intermediate floor; FIG. 11 is a perspective view of an embodiment with a hollow vertical body and an intermediate floor;

(Embodiment 1) Construction of a dome-shaped member network provided with hollow vertical bodies 8 will be described with reference to FIGS. 9 and 10. FIG. The dome-shaped member network to be constructed is assumed to be a medium-sized dome-shaped member network.

In the dome-shaped member network provided with the hollow vertical bodies 8, as shown in FIG. 9(a), all 16 straight members 2 required for construction are arranged at equal intervals to form a convex-shaped member network.
In the conventional method (Patent Document 4) as shown in FIG. Configured. The dome-shaped member network provided with the hollow vertical members 8 has the advantage that 16 linear members 2 need only be arranged once.

Concrete is placed on the foundation work 1 for the substructure 9 of the hollow vertical body 8, the substructure 7 of the vertical support base 6, and the annular support 5 of the dome-shaped member network. After curing the concrete, a hollow vertical body 8 and a vertical support base 6 are fixed to the substructure.
The hollow vertical body 8 may be made of concrete, but in order to shorten the construction period, it is constructed by connecting steel pipes with a diameter Δ to the required height f. A disk fixing plate 3 is installed on the top of the constructed hollow vertical body 8 .

The intermediate portions of 16 linear members 2 having a length S0/2 in the cross-shaped cross section shown in FIG. The inner end of the linear member 2 projecting inward from the vertical support base 6 is lifted by a crane or the like and fixed to the circular fixing plate 3 using the fixing plate 3a, the bolt 3b and the nut 3c (see FIG. 4).

The ends of the straight members 2 which are overhanging from the vertical support base 6 and are floating from the foundation work 1 are connected with the surrounding wires 4 to construct a projecting member network (see the solid line in FIG. 9(b)).

By contracting the diameter of the linear member 2 by applying a horizontal force ΣH to the end of the linear member 2 of the convex member network, the linear member 2 separates from the holding member 6e of the vertical support base 6, becomes arched, and the end of the linear member 2 is formed into an annular shape. When the diameter is reduced to the bearing 5, the rise reaches f, and the end of the linear member 2 is fixed to the annular bearing 5 to construct a dome-shaped member network (see the broken line in FIG. 9(b)). The vertical support base 6 of is removed.

Using the constructed dome-shaped member network as a basic structure, various dome structures such as thin-layer domes, steel structures or concrete structures are constructed. The structure of the annular bearing 5 is determined so as to withstand the horizontal force generated by the rear structure constructed using the network of dome-shaped members. Concrete construction with PC structure or RC structure is usually selected.

FIG. 10 is an illustration of a network of dome-shaped members provided with an intermediate floor 11. FIG. The plan view of FIG. 10( a ) shows a plurality of fan-shaped slabs 112 on the first floor 10 and the intermediate floor 11 . The intermediate floor 11 increases the total floor area of the dome and the effectiveness of the intermediate floor 11 is recognized. At the same time, the intermediate floor 11 is a very efficient use of the dome height space.

Elevating facilities 12 such as stairs to an intermediate floor 11 and an automatic elevating device are provided inside or around the hollow vertical body 8 (see FIG. 10(b)).

FIG. 11 is a perspective view of an example of a network of domed members having hollow vertical bodies 8 and intermediate floors 11. FIG. The intermediate floor 11 makes it possible to realize an impressive network of domed members.

1: Foundation work 2: Linear member 2a: Strong axis 2b of cross section: Weak axis 21 of cross section 21: Width stop steel of straight member 3: Circular fixed plate 3a: Fixed plate 3b: Bolt 3c: Nut 4: Surrounding wire 5: Circular Bearing 6: Temporary vertical support base 6a: Parallel plate 6b: Bottom plate 6c: Width stopper 6d: Diagonal member 6e: Holding material 7: Substructure of vertical support base 8: Permanent hollow vertical body 81: Hollow vertical body Peripheral overhang 9: Substructure of hollow vertical body 10: Floor floor 11: Intermediate floor 111: Support beam 112: Fan-shaped slab 12: Lifting facility L: Span of dome-shaped member network S0: Arc length f of dome-shaped member network : Rise of dome-shaped member net h: Height of straight member b: Width of straight member Δ: Diameter of circular fixed plate Circle 1: Plane member net circle 2: Convex member net circle 3: Dome-shaped member net

Claims (3)

A construction method for constructing a dome-shaped member network of a framework structure using straight members, comprising:
A permanent hollow vertical body having a height approximately equal to the height of the center of the dome-shaped member network to be constructed is installed in the substructure provided at the center position of the dome to be constructed, and a circular shape is formed on the top of the hollow vertical body. A fixed plate is arranged, the inner ends of a plurality of linear members constituting a dome-shaped member network are fixed to the circular fixed plate, and the intermediate portions of the linear members are held by one or more vertical support bases. and the outer ends of a plurality of non-landing straight members that project outward are locked by an enclosing wire that is free to slide in the enclosing direction and cannot move radially, thereby forming a network of convex members. contraction exerting an inwardly directed horizontal force on the outer ends of the linear members constructed and forming the network of convex members, and the outer ends of the linear members are brought into annular bearings of the network of dome members; By attracting and fixing, a dome-shaped member network is constructed,
A perforated circular intermediate floor is constructed by supporting the width stopping steel on the inner periphery of the intermediate part of the constructed dome-shaped member net and the projecting part on the outer periphery of the intermediate part of the hollow vertical body. A method for constructing a dome-shaped member network. 2. The method of constructing a dome-shaped member network according to claim 1, wherein a lifting facility is provided inside or on the outer circumference of said hollow vertical body for lifting between the base floor and said intermediate floor above it. .
3. The method of constructing a dome-shaped member network according to claim 1, wherein the cross section of said hollow vertical body is circular or rectangular.

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