JPH05280222A - Mortar form and dome roof formed with its form - Google Patents

Abstract

PURPOSE:To provide a roof with a specified curvature easily by arranging reinforcement on a film body swollen in a dome roof shape, providing a thick wall part at a specified area of the circumferential part of roof, thereby forming a mortar form, and placing concrete thereon, thereby forming a dome roof. CONSTITUTION:A film body 4 is layed on the roof part of a structure 1 for a storage tank and the like, and thereon reinforcement is arranged, then placing mortar to form a form. In forming the mortar layer 7, a thick wall part 8 is provided at an area of the roof circumferential part with a specified angle (a), to which part 8 load, compression force, bending moment and the like are greatly effected. A reinforcing member 11 is arranged on the mortar layer 7 to form a comrete layer 10. A roof can also formed only by the mortar layer 7. It is thus possible to construct a concrete-made dome roof efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete dome having a structure such as a storage tank for storing liquid, low-temperature liquefied gas, powder, granules, etc. (hereinafter, the dome in the present invention means a spherical surface, a curved surface, a polyhedron, etc. The present invention relates to a mortar formwork using an air film for building a roof and a dome roof formed by using the formwork.

[0002]

2. Description of the Related Art When constructing a concrete dome roof for structures such as storage tanks, mortar or concrete is placed on a membrane supported by internal pressure such as compressed air without using conventional supports and forms. The invention of the construction method to be provided is disclosed in JP-A-1-29.
It is disclosed in Japanese Patent No. 5974 or Japanese Patent Laid-Open No. 3-55365. In these inventions, the upper open surface of the structure main body is airtightly covered with a flexible film body, and the flexible film body is expanded into a dome roof shape by pressurizing air blown into the structure main body to expand the structure. After that, mortar or concrete is cast on the flexible film body to construct a dome roof.

[0003]

[Patent Document 1] Japanese Patent Application Laid-Open No. 1-29597
The inventions of No. 4 and Japanese Patent Application Laid-Open No. 3-55365 eliminate the need for conventional temporary work for assembling support and molds, etc.
When placing mortar or concrete, it is necessary to support the entire load of the mortar or concrete with a flexible membrane that receives air pressure, so the tension acting on the flexible membrane increases.
Therefore, there is a problem that special consideration must be given to the material and strength. In order to solve these problems, the applicant of the present invention invented a formwork formed of a mortar layer containing a reinforcing material on a flexible film body under air pressure, and applied for a patent application No. 2-228314. .. Although the present invention is suitable for a small-diameter dome roof, the large amount of the reinforcing material to be put in the mortar layer causes a concern about the economical efficiency in the large-diameter dome roof.
Further, as shown in FIG. 3, the upper open surface of the structure main body 1 such as the storage tank composed of the bottom plate 2 and the side wall 3 is covered with the film body 4 made of a flexible material, and the film body 4 is exposed to the air pressure of the blower 5. When receiving a dome-shaped roof, it is difficult to obtain a dome shape with the desired uniform curvature as shown by the broken line in the figure, and as shown by the solid line, the zenith with a bulged outer peripheral portion of the membrane is a flat dish shape. Since the mortar and concrete to be applied on the film body naturally have a flat shape as shown by the alternate long and short dash line in the figure, it is difficult to obtain a dome roof having a desired curvature.

The present invention has been made in view of the above points, and is used for constructing a concrete roof having a dome shape with a desired curvature on an air film without requiring a conventional formwork or supporting structure. The mortar formwork is a mortar formwork with a thickness that has the strength to withstand the loads that act on the roof, and is not limited to a mere formwork. And a mortar formwork that is configured to reduce the concrete thickness, etc.
It is intended to provide a dome roof formed by the formwork.

[0005]

A mortar formwork according to the present invention comprises a film body for covering the upper part of a main body of a structure such as a storage tank with air pressure to form a dome roof shape, and a mortar layer cast on the film body. A mortar formwork formed by (1) and (2), wherein the mortar layer has a thick portion provided in a predetermined range around the dome roof. Further, the dome roof is formed by the flexible film body, the mortar mold and the concrete layer applied on the mortar mold.

[0006]

[Function] Concrete is provided on the upper part of the structure body such as a storage tank by the air-pressured film body and the mortar layer cast on the film body so that a thick portion is provided in a predetermined range around the dome roof. A mortar mold having sufficient strength to withstand as a formwork for placing and a supporting work is formed. In other words, by providing a thicker part than the thickness of the mortar layer on the other film body in a predetermined range of the mortar layer around the dome roof that is connected to the side wall bearing part of the main body of the structure such as the storage tank, especially after hardening of the mortar. Has increased durability against the load applied to the dome roof edge. Further, by providing a thick portion in a predetermined range around the dome roof and changing the mortar thickness, the film body bulging into a flat shape is corrected and a desired dome shape can be obtained. In other words, the peripheral part of the film body is pressed and corrected by the weight of the thick part of the mortar so that the film that bulges outward is directed inward, and the zenith part of the film body thins the mortar and the film bulges outward. To increase. Also, when placing mortar,
When the peripheral part is constructed in advance by providing a ring-shaped thick part, the peripheral part of the film body that receives air pressure swells and corrects by applying tension to it, and then continues toward the zenith part. The mortar can be cast while inflating the film body so that it does not become flat, and it becomes easy to obtain a dome shape having a desired curvature. In addition, the mortar formwork, which is reinforced by providing a thick part in a predetermined area around the dome roof, becomes a component of the dome roof as it is after pouring concrete on the upper part. It can be made thinner than before. In addition, the mortar formwork can be its own dome roof structure.

[0007]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 is a side cross-sectional explanatory view showing a construction state of a mortar formwork for constructing a concrete dome roof for a structure such as a storage tank showing one embodiment of the present invention, and FIG. It is an expanded explanatory view of a roof edge support part. Structure body 1
Is a main body of a concrete storage tank composed of a bottom slab 2 and a side wall 3, and an upper open surface thereof is covered with a film body 4 made of a dome-shaped flexible material to form a sealed body. The film body 4 receives the air pressure from the blower 5 and swells into a dome shape, and the reinforcing material 6 is arranged on the upper part of the film body 4 and the mortar layer 7 is cast. The mortar layer 7 is provided with a thick portion 8 of mortar in a predetermined range around the dome roof which is connected to the support portion 9 at the upper end of the side wall 3 to increase the thickness, and the dome zenith portion reduces the thickness of the mortar to increase the mortar thickness. Form the formwork. This mortar formwork is used as a formwork and support work, a reinforcing material 11 is arranged on the upper part thereof, and a concrete layer 10 is cast to construct a concrete dome roof. The mortar formwork may be used as a mortar dome roof by itself without placing concrete on the top.

As shown in FIG. 2, the periphery of the mortar layer 7 is
Starting from the edge support portion 9 of the dome roof, a range of at least a predetermined angle a from a base line connecting the starting point and the center A of the dome curvature, for example, a range where a load, a compressive force, a bending moment, a shear force, or the like is large, or a film. The thick portion 8 is formed with a range in which the body is about to expand beyond a predetermined curvature. The thickness of the mortar layer 7 is such that the strength after hardening is such that it can withstand the placement of the concrete layer 10, and in particular, the thick wall portion 8 around the dome roof has a reinforcing material 11 such as a reinforcing bar embedded in concrete. And the load of the concrete layer 10, the operator and the placing load, and the load applied from the dome roof and the side wall,
It is formed to a thickness having sufficient strength. This thick part 8
Reinforces the peripheral portion of the concrete dome roof by gradually increasing the thickness toward the peripheral portion of the roof. It can be made thinner. Furthermore, if the upper surface of the thick portion 8 is constructed so that the slope is flat or gentle, it is possible to prevent the mortar from flowing to the outer peripheral side and collapsing at the time of mortar casting. In addition to making it easier to do, the concrete to be placed on top of it also does not easily flow and fall down on the outer peripheral side, making it easier to perform finishing work to adjust the dome roof shape. In the present embodiment, the case where the thickness of the thick portion 8 is continuously changed has been described, but the present invention is not necessarily limited to this, and the thickness of the thick portion 8 may be changed to a discontinuous step, or the entire thick portion 8 may be changed. You may make it the same thickness.

Since the thick portion 8 is provided at the periphery of the mortar layer 7 and the thickness of the mortar layer 7 is changed, the bulging of the peripheral portion of the film body 4 as shown in FIG. The zenith of the film body 4 to be pressed and corrected, and to dent, pushes up the thin mortar to increase the bulge, so that the film body 4 and the mortar layer 7 and the concrete layer 10 to be constructed thereon are Prevents the dome shape from becoming flat,
A dome roof with a desired curvature can be formed. In addition, when the mortar layer 7 is applied by providing the ring-shaped thick portion 8 in advance of the peripheral portion, the bulge of the peripheral portion is pressed and corrected by the mortar of the thick portion 8, Next, it is possible to consider the construction procedure such that the construction is performed so that it does not become flat toward the zenith, and it becomes easy to obtain a dome shape with a desired curvature. Further, in the present embodiment, the thick portion 8 is provided in a predetermined range of the peripheral portion of the mortar layer 7, but it may be provided so that the thickness gradually decreases toward the zenith portion over the entire dome roof.

[0010]

Since the present invention is constructed as described above, it has the following effects. Mortar layer around the edge of the dome roof By increasing the thickness of the mortar layer, the mortar formwork for placing concrete increases durability against the load applied to the dome roof and is stronger and safer. A mortar formwork having a high property can be obtained. In addition,
When only the membrane body and the mortar formwork are used as the dome roof structure, the material can be reduced and workability can be improved by omitting the placing of concrete.

By changing the thickness of the mortar layer by providing a thick portion in a predetermined range around the dome roof, the peripheral portion of the film body is corrected by pressing the bulge with the thick portion mortar. The zenith part pushes up the thin mortar layer to increase the bulge and prevent the film body from trying to have a flat shape, so that a dome roof having a desired curvature can be obtained. Also, when applying the mortar layer, if the peripheral part is preceded by providing a thick part in the shape of a ring, the bulge on the peripheral part of the film body is pressed and corrected, and then the zenith part of the film body. Can be inflated so that it does not become flat, and it is easy to obtain a dome shape with a desired curvature.

Further, the mortar formwork, which is reinforced by providing a thick portion in a predetermined area around the dome roof, can be used as it is as a constituent member of the dome roof after the concrete is placed on the upper part thereof. The concrete pouring thickness can be made thinner than before. Furthermore, since the upper surface of the thick-walled mortar formwork at the peripheral edge is gently sloping, mortar and concrete do not flow and collapse during casting of mortar and concrete at the top, and workability is improved. The dome roof shape can be easily adjusted to a desired shape.

[Brief description of drawings]

FIG. 1 is a side cross-sectional explanatory view showing a construction state of a mortar formwork for constructing a concrete dome roof according to the present invention, with a part thereof being cut away.

FIG. 2 is an enlarged explanatory view of a dome roof peripheral support portion in FIG.

FIG. 3 is a side cross-sectional explanatory view showing a state in which a dome-shaped film body covering an upper portion of a structure such as a storage tank receives air pressure.

[Explanation of symbols]

 1 Structure Main Body 2 Bottom Plate 3 Side Wall 4 Membrane Body 5 Blower 6 Reinforcement 7 Mortar Layer 8 Thick Section 9 Bearing Section 10 Concrete Layer 11 Reinforcement

Claims (2)

[Claims] 1. A mortar formwork comprising a film body for covering the upper part of a main body of a structure such as a storage tank with air pressure to form a dome roof shape, and a mortar layer cast on the film body. The layer is a mortar formwork characterized in that a thick portion is provided in a predetermined range around the dome roof. 2. A film body for covering an upper part of a main body of a structure such as a storage tank into a dome roof shape by receiving air pressure, and a mortar cast on the film body so that a thick portion is provided in a predetermined range of a peripheral edge of the dome roof. A dome roof formed of a layer and a concrete layer constructed on the mortar layer.