JPH0658012B2 - Curved surface concrete molding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a reinforced concrete structure whose outer surface is formed of a special curved surface. More specifically, such a curved surface is formed on the outer surface of concrete. The present invention relates to a method of casting concrete by directly placing it in a mold, instead of performing a finishing step for molding.

[Prior Art] In general, when constructing a structure as a reinforced concrete structure (hereinafter referred to as RC structure), a formwork is built in a predetermined place, concrete is poured to form a structure, and the finish of the outer surface is designed. It will be installed separately according to. If the structure is a building, the formwork on both sides is in principle parallel, and there is no problem with the method of assembling the formwork, which mainly uses standard-shaped panels, but a separate finishing process is required. In order to rationalize both the workability and the construction period, in the structure where the surface concrete is exposed to the finish, the formwork becomes more important in concrete construction, and the construction cost is affected both by the material and the work due to the formation of the special surface. You must consider that. For example, it is relatively easy to form a groove on a concrete surface by mounting a crosspiece on a flat barrier plate of a formwork. However, when constructing a structure of any shape by utilizing the free formability of concrete, not only is it difficult to use a standard formwork, but the molding surface is often not flat, In many cases, it depended on the carpenter's skill in making the formwork, and sometimes the technique of engraving.

On the other hand, in the manufacture and assembly of the form itself, a form called "comb form" has been conventionally used for a special molding surface. This is one in which a flexible plate material is used for the concrete dam plate, and an uneven surface is formed from the skeleton on the back surface to the crosspiece member to assemble the concrete form supporting material. It is well known how to divide into four equal parts and to assemble them like a prism by using four comb formwork. Therefore, an ordinary separator should be used as the binding member for such a mold.

[Problems to be Solved by the Invention] In the conventional method for molding curved concrete, the separator is sized from the distance between the molds on both sides to form a bolt, and a cone member attached to the inner surface of the mold is attached to the bolt. After inserting the mold, it was tightened with nuts and wedges.
However, if the curved surface is complicated and has two-dimensional unevenness, it is difficult to order the dimensioned bolts, and the management during use becomes complicated, which is hardly practical. It is also possible to use standard products for both ends of the bolt and connect the middle part with bolts dimensioned locally, but it is difficult to reach for connections such as welding between formwork. , I cannot do perfect welding. Moreover, the comb formwork for the special curved surface requires the skill of a skilled carpenter,
Not only is it necessary to produce one item, but the labor situation these days is that both carpenters and welders are out of stock, making it even more difficult for engineers who handle curved surfaces to obtain it.

[Means for Solving Problems] The present invention addresses the above problems, eliminates the drawbacks, and adapts it to the construction of a special structure by RC construction. It was developed for the purpose of providing a method for molding curved concrete so that it will also match, and especially when manufacturing a large Buddha statue with concrete, a configuration that allows the binding device for curved formwork to cope with dimensional changes The main point is that the method was to construct concrete by directly placing it. And, the above-mentioned molding method is to arrange a sleeve between the molds on both sides for molding concrete, the bolts for binding are threaded over the entire length, and after inserting it into the sleeve, comb-shaped mold and inner surface mold It is characterized in that it is tightly bound with a frame, which enables to form a basic curved formwork and achieve a curved concrete molding method that can cope with the irregular dimensions of an arbitrary curved surface. It succeeded in using a separator bolt that only considers the lateral pressure during installation.

[Examples] A method for molding curved surface concrete according to the present invention will be described in detail with reference to the drawings showing preferred examples. Figure 3 shows RC
It is a front view of a statue of Kannon, which was built as a religious structure independent of itself, and has a monumental character in itself. 1 is the whole body, 2 is the head, 3 is the image part, and 4 is the baby held in Kannon's chest. The whole body 1 is made of RC with a height of 57 m above the ground, the inside is hollow, and it is reinforced by complicated shaped reinforcing bars. Head 2 is about 10m high and 4 babies
Has a height of about 11 m, and the features of the entire outer surface are the rounded curved surface of each part of the human body, the subtle unevenness of eyes, nose, mouth, etc., and the ridges of the "folds" of the costume. The entire statue is 1 /
It was made by enlarging from 25 original models to the actual size.

FIG. 1 is a cross-sectional view of the concrete portion, where 5 is an inner hollow portion and 6 is an outer portion. The outer surface 61 of the structure is represented by a schematic curve. Reference numeral 10 as a whole is a mold for molding concrete 20, 11 is an inner mold, 12 is an outer curved mold for molding an outer surface 61,
Reference numeral 13 denotes a comb shape on the outer side of the curved formwork 12, and 14 denotes inner and outer formwork support. 30 is a binding device for the form 10,
It consists of a tightening bolt 31 and a sleeve 32. The tightening bolt 31 uses a steel rod having a thickness of 12 mm, which is threaded over the entire length, and the sleeve 32 uses the bolt 3
The inner formwork 11 and the curved formwork 12 have a thickness that allows 1 to be inserted therethrough.
Diameter 20 cut into a length that can penetrate both according to the interval of
mm synthetic resin pipe material. Tightening bolts 31 are provided at both ends of the fastening bolts 31, and the inner mold 11 and the comb 13
The supporting work (square steel pipe) 14 is tightened on each outer surface of the. As shown in FIG. 1, the comb 13 may be assembled in units by the connecting bar 16.

[Operation] The operation of the present invention will be described based on the construction process of concrete construction. Since the inner formwork 11 shown in FIG. 1 is for an inner hollow part, what is formed as an ordinary flat formwork may be used in units of a fixed length and assembled so as to form a folded curved surface. As shown in FIG. 2, the external curved form 12 is manufactured based on a drawing in which the original model is enlarged to the actual size of construction using a computer. The barrier plate 15 is a small width plate having a thickness of 10 mm, and has a combable bone plate 13 having a workable width.
Assembled on the surface, a 2.7 mm thick plywood is attached to the surface, the plate surfaces are gently connected, and there is no misalignment to make a curved form panel
Form 2. The comb 13 is generally arranged in one direction,
The distance a is 20 to 30 cm, and 25 cm is standard. With respect to the complicated curved surface of the barrier plate 15, it is preferable that combs are assembled vertically and horizontally or an auxiliary bar is used to facilitate the attachment of the barrier plate 15. The surface that supports the barrier plate 15 forms a curved surface that strictly follows the design. The curved form 12 is manufactured in a height section of approximately 2.5 m according to the concrete design plan, and the outer edge of each comb 13 is aligned on the same plane. Here, returning to FIG. 1, the inner formwork 11 is built in a conventional manner, and the sleeve 32 is penetrated between the inner formwork 11 and the curved formwork 12, and the outer end thereof is formed between the comb shape 13. Cut through through. The tightening bolts 31 need only support the lateral pressure of the poured concrete, but at the upper and lower edges of the curved formwork 12 every 2.5 m in height, nuts are screwed onto the tightening bolts 31 using all screws. Fix it to act as a separator.

Then, the tightening bolts 31 are inserted into the sleeve 32, and the supporting members 14 are tightened by using the fasteners 33 at both ends to complete the entire formwork 10 for the concrete 20. The support 14 can assemble the inner and outer surfaces in a straight line, and the length of the tightening bolt 31 can be set to be constant regardless of the unevenness of the outer surface 61.

Placing the concrete 20 and demolding the mold 10 are carried out in the same manner as in the conventional method.
Since there is no adhesion between the concrete 20 and the concrete 20, the fastening bolts 31 are all recovered by simply releasing the fastening hardware 33. Further, the sleeve 32 is extracted and processed by using a dedicated driving rod.

EFFECTS OF THE INVENTION The present invention relates to a mold for molding a curved surface outside a structure,
The curved formwork with strict unevenness is supported by the support along with the inner formwork, the tightening bolts are inserted into the sleeve that penetrates the concrete part, and the concrete is placed by tightening it. The outer surface of concrete, which changes a lot, can be molded by a faithful curved surface form, and at that time, various technical or labor problems of forming a complicated comb shape can be reliably solved. Also,
The tightening bolts used are only threaded over the entire length, and there is no need to prepare various lengths according to the irregularities of the concrete. Furthermore, since it is used by inserting it through a sleeve that penetrates through concrete, it can be collected after placing concrete, and it has a groundbreaking practical effect in terms of labor and materials. The present invention provides a very useful curved concrete molding method.

[Brief description of drawings]

The drawings are for explaining the method for molding curved concrete of the present invention based on an embodiment, FIG. 1 is a standard cross-sectional view of a concrete formwork, and FIG. 2 is an explanation for assembling a curved formwork and a comb shape. FIG. 3 and FIG. 3 are front views of a reinforced concrete structure shown in a preferred embodiment. 1 ... Whole body, 2 ... Head, 3 ... Image part, 4 ... Baby,
5 ... Hollow part, inside, 6 ... External, 10 ... Formwork, 11
…… Inner form, 12 …… Curved form, 13 …… Comb bone plate, 14 …… Supporting work, 15 …… Weir plate, 20 …… Concrete, 30 …… Binding device, 31 …… All Screw tightening bolt, 32 ... Sleeve, 33 ... Tightening hardware, 61 ... Outer surface.

Claims (3)

[Claims] Claim: What is claimed is: 1. A method of molding a reinforced concrete structure, the outer surface of which is formed by a special curved surface, by directly placing concrete in a formwork, and using a small unit of plate material to form a comb-shaped bone plate. A step of forming a weir plate that is pasted to form a curved surface and forming a curved form, a step of assembling a support on the back surface of the curved form, between the weir plate of the curved form and the inner form In the step of inserting a sleeve having a predetermined inner diameter into the inner mold and the curved mold, insert all the screw tightening bolts through the sleeve to support the entire mold. A method of forming curved surface concrete, which comprises a step of tightly connecting via a step of placing concrete between the curved surface mold and the inner mold. 2. A dam plate for molding a curved surface is formed by connecting a small flat plate and adhering it to a comb-shaped bone plate, and forming a smooth curved surface by laminating plywood on the surface of this base material. The method for forming curved surface concrete according to claim 1, which is characterized in that. 3. The method for forming curved surface concrete according to claim 1, wherein the sleeve is a pipe material made of synthetic resin.