JPH1061014A - Construction method of reinforced concrete dome - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method capable of constructing a high quality reinforced concrete dome safely even in a steep slant dome. SOLUTION: A curved surface segmentary precast concrete board is manufactured which is divided equally in a manner making a dome apex comprising a part of a sphere as a point symmetry. So, a double mold frame roof is formed of an inside precast concrete board 1 and an outside precast concrete board 2, followed by placing concrete into a space defined in the double mold frame roof for construction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a reinforced concrete dome.

[0002]

2. Description of the Related Art A reinforced concrete dome cannot be constructed as easily as a flat ceiling. Since the entire dome has a curved surface, first, a mold formed of plywood is assembled in a dome shape at a position corresponding to the lower surface of the dome. Reinforcing bars are placed on top of them, and then concrete is poured from a high position to construct a reinforced concrete dome.

[0003]

The conventional method of constructing a reinforced concrete dome as described above has the following problems. <A> Collecting a large number of plywoods in a planar state to form a three-dimensional and curved surface is a difficult task requiring a long skill to ensure accuracy. <B> It is necessary to finely arrange the form support, which is troublesome. <C> If the dome has a steep slope, a formwork must also be placed on the upper side, but this places many restrictions on concrete casting. <D> It takes a lot of work to cast concrete in a narrow space between the upper and lower molds and to ensure good quality. Furthermore, since the state of concrete filling cannot be grasped from the outside, careful work is required to cast solid concrete. <E> There is a problem from the viewpoint of safety in performing a complex concrete placement operation and a placement management at a high position.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a method for constructing a reinforced concrete dome that is safe and of high quality even if the dome has a steep slope. The purpose is to provide.

[0005]

In order to achieve the above object, a method of constructing a reinforced concrete dome according to the present invention is directed to a curved fan type in which the vertices of a dome composed of a part of a sphere are equally divided with point symmetry. Manufactures precast concrete slabs, constructs a double formwork roof with an inner precast concrete board and an outer precast concrete slab, and injects concrete into the space of this double formwork roof to build reinforced concrete. It features a dome construction method.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for constructing a reinforced concrete dome according to the present invention will be described below with reference to the drawings.

<A> Fan-shaped precast concrete plate A. A vertex of a dome composed of a part of a hollow sphere, such as a hollow hemisphere, is evenly divided with point symmetry to produce a curved fan-shaped precast concrete plate A. Since it is a "part of a sphere", it is not limited to a "hemisphere" that is accurately cut by a plane passing through the center of the sphere, but also includes a shape cut by a plane or curved surface that does not pass through the center of the sphere. Since it is a part of a hollow sphere, it has a certain thickness. For this purpose, an inner precast concrete plate 1 forming the inside of a part of the sphere and an outer precast concrete plate 2 forming the outside are manufactured. Precast concrete board 1 inside
And, if the unevenness 3 is formed on the surface facing the outer precast concrete plate 2 when the double form roof is assembled, the adhesion to the concrete poured into the interior is ensured.

<B> Production of precast concrete plate A (FIG. 5) In order to manufacture a curved fan-shaped precast concrete plate A, an internal form 4 corresponding to the shape of the hollow portion of the inner and outer precast concrete plates 1 and 2 is prepared. After arranging reinforcing bars on both sides of the inner formwork 4 with a fixed interval, the outer formwork 5a, 5b is installed. The space between the inner form 4 and the outer forms 5a, 5b is the finished thickness of the concrete dome frame. The irregularities 3 may be formed on both surfaces of the inner mold 4 in some cases. Thereafter, concrete is poured into the space, and after the concrete has developed strength, the outer formwork 5 is dismantled to produce the precast concrete plate A. On the curved side of the precast concrete plate A,
The bolt holes 6 are opened and used for connection.

<C> Double roof construction. (FIGS. 3 and 4) The gantry 7 is installed at the position where the dome is to be constructed, and the inner precast concrete plate 1 is first installed on the gantry 7. When the curved fan-shaped precast concrete plates 1 are assembled adjacent to each other, an inner surface of a part of a sphere is formed. The reinforcing bar 8 is set thereon. This reinforcing bar 8
During the production of the inner precast concrete board 1,
They may be attached together at the factory, or they may be assembled in a basket and placed on site. Further rebar 8
And at regular intervals. The outer precast concrete plate 2 is installed. Bolt holes 6 are opened in the precast concrete plates 1 and 2 in order to secure a constant interval and accurately set the positions of the inner and outer precast concrete plates 1 and 2. A separator / bolt is inserted into the bolt hole 6 and fixed with a nut. In this way, a double form roof having a space layer formed therebetween is formed.

<D> Inject concrete. Concrete is poured into the space of the double formwork roof composed of the inner and outer concrete plates 1 and 2. For this purpose, an injection hole for injection is opened in a small number of inner concrete plates 1, and pressurized concrete is press-fitted. At this time, it is also possible to perform press-fitting by dividing into a plurality of stages in the height direction so that a high press-fit pressure is not required.

[0011]

According to the method of constructing a reinforced concrete dome of the present invention, the following effects can be obtained. <B> In the conventional method of assembling a formwork on site and constructing a dome, abundant experience and a great deal of labor were required to form a smooth curved surface. However, the present invention produces a large number of curved fan-shaped concrete plates A of the same shape at a factory,
This is a method of sequentially assembling them on site. As a result, it has become possible to easily construct a dome having high accuracy, high quality, and a smooth curved surface. <B> This is a structure in which a precast concrete plate A is used on the inner and outer surfaces of the dome as a mold and structure. Therefore, not only can a highly accurate body shape be constructed, but also the waterproofness, the resistance to freezing and thawing, the airtightness, and the like can be improved. <C> A method is adopted in which concrete is pressed from below rather than cast from above. Therefore, the concrete is hardly separated, becomes dense, and can secure a predetermined strength. Therefore, it has become possible to maintain high and stable quality as a structure. <D> If the unevenness 3 is formed on the inner surface of the precast concrete plate A, it is possible to improve the integration with the concrete that is pressed into the inside. And concrete board A
Since the irregularities 3 can be easily formed at the time of manufacturing, it is easy to give a complicated shape.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a precast concrete plate for constructing a reinforced concrete dome of the present invention.

FIG. 2 is a plan view of a curved fan-shaped precast concrete plate in which the apex of the dome is point-symmetrically divided equally.

FIG. 3 is an explanatory view of a state where inner and outer concrete plates are assembled.

FIG. 4 is an explanatory diagram of a construction state.

FIG. 5 is an illustration of a concrete plate manufacturing process.

Claims (3)

[Claims] 1. A curved fan-shaped precast concrete plate in which a vertex of a dome composed of a part of a sphere is point-symmetrically evenly divided is manufactured, and a double mold is formed by an inner precast concrete plate and an outer precast concrete plate. A method of constructing a reinforced concrete dome by constructing a frame roof and press-fitting concrete into the space of this double form roof 2. The construction of a reinforced concrete dome according to claim 1, wherein the inner precast concrete plate and the outer precast concrete plate are connected by bolts to form a double form roof with a predetermined interval. Method. 3. The method for constructing a reinforced concrete dome according to claim 1, wherein the inner precast concrete plate and the outer precast concrete plate have irregularities formed on surfaces opposed to each other when the formwork roof is assembled.