JPH0533883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a mortar tube having a rectangular cross section, such as a triangular, square, or hexagonal cross section both inside and outside, and to a formwork thereof.

[Conventional technology]

In general, to manufacture mortar pipes with cogonal inner and outer sides, a rectangular tubular molding space is created between an outer frame forming the outer shape and an inner frame forming the inner shape, and concrete or concrete is poured into this forming space from the end face. It is manufactured by pouring mortar and compacting it by vibration using a rod vibrator. However, this product produces bubbles and the like on the product surface, making it difficult to obtain a product of stable quality. There are also square tubes that are formed using centrifugal force, but the inner shape is cylindrical, and square tubes whose inner shape is similar to the outer shape are not manufactured.

[Problem that the invention seeks to solve]

The present invention aims to obtain a method for manufacturing a mortar tube having a rectangular shape both inside and outside with excellent quality, and a formwork for use in this manufacturing.

[Means for solving problems]

The means of the present invention to achieve this object are as follows: (1) A plurality of one or both inner formwork elements having a triangular and fan-shaped cross section are molded to have the same inner shape as the rectangular pipe whose inner and outer cross sections are square. Along with forming a prismatic shape,
The flat plate forming surfaces of adjacent inner formwork elements are arranged so as to form a groove along the longitudinal direction thereof, and end plates having approximately the same external shape as the cross-sectional shape of the square tube are provided at both ends thereof. An inner formwork removably attached so as to be concentric with the prismatic shape is attached to one inner surface of the outer frame, which has an inner surface having the same cross-sectional shape as the outer shape of the rectangular tube and is divided into two on a diagonal line, Insert the inner formwork described above, stack the other outer formwork on top of it, assemble the outer formworks into a cylindrical shape, wrap the inner formwork, and pour mortar into the inner formwork through the hole provided in the center of the end plate. (2) A method for manufacturing a square mortar tube with square inner and outer cross sections, in which a plurality of one or both of inner formwork elements having a triangular and fan-shaped cross section are formed by centrifugal molding by inserting a square mortar tube. It has the same prismatic shape as the inner shape of
The flat plate forming surfaces of adjacent inner formwork elements are arranged so as to form a groove along the longitudinal direction thereof, and end plates having approximately the same external shape as the cross-sectional shape of the square tube are provided at both ends thereof. A mortar angle consisting of an inner formwork removably attached so as to be concentric with a prismatic shape, and an outer formwork divided into two on a diagonal line and having an inner surface with the same cross-sectional shape as the outer shape of the above-mentioned square pipe. Formwork for manufacturing mold tubes; (3) one or both of a columnar inner formwork element having a triangular and fan-shaped cross section; and a columnar intermediate inner form element having a cross section surrounded by one straight line and one chevron-shaped curve; A plurality of inner formwork elements and intermediate inner formwork elements are arranged alternately so that the inner and outer cross sections to be molded form the same prismatic shape as the inner shape of the square tube, and these inner formwork elements and A groove is formed along the longitudinal direction between the flat plate forming surfaces of the intermediate inner formwork element, and end plates having approximately the same external shape as the cross section of the square tube are placed at both ends of the flat plate forming surface. A mortar square type consisting of an inner formwork removably attached so as to be concentric with the columnar shape, and an outer formwork divided into two diagonally and having an inner surface having the same cross-sectional shape as the outer shape of the above-mentioned square pipe. This is a formwork for pipe manufacturing.

In the present invention, the word mortar is used as a synonym for concrete.

〔Example〕

The present invention will first be described with reference to an embodiment shown in FIGS. 1 to 5.

The inner formwork 1 shown in FIGS. 1 and 2 consists of four inner formwork elements 3 and two end plates 4. As shown in FIG. 3, the inner formwork element 3 is made of a steel plate by welding a right triangular cylindrical portion and a portion closing both ends of the portion. The right-angled edges are chamfered to form corner forming surfaces 7. The sides on both sides are
It is used as a flat plate part forming surface 6 for forming the flat part of the inner surface of the mortar tube to be manufactured. Since this embodiment shows the production of a square tube with a square cross section, the width of the flat plate molding surface 6 is formed to be slightly smaller than half of the width between opposite sides of the inside of the square tube to be molded. has been done. The end plate 4 is made of a steel plate, and is made to have approximately the same external shape as the cross-sectional shape of the rectangular tube to be formed. The four inner formwork elements 3 are arranged so that the inner and outer sides of the molded mortar tube form the inner surface of the mortar tube, which has a square cross section.
The corner molding surfaces 7 are located at the four corners to form a square columnar shape, and the end plates 4 are formed at both ends so as to form a groove 5 along the centerline direction between the flat molding surfaces 6 of adjacent inner formwork elements 3. It is assembled using bolts 10.

The outer formwork 2 is formed of a steel plate in the shape of a V-shaped gutter that divides the outer shape of the mortar pipe to be formed into two on a diagonal line,
It has flanges 11 along both edges, and an anti-circular tire 12 is attached to its outer surface. 1st
The inner formwork 1 assembled as shown in FIGS.
As shown in FIGS. 4 and 5, the outer form 2 is combined into one outer form 2, and the other outer form 2 is combined with the previous outer form 2 to wrap the inner form 1, and then When the flanges 11 of the outer formwork 2 are connected with bolts and the two outer formworks 2 are assembled into a cylindrical shape, the outer shape of the end plate 4 and the inner formwork element are formed between the outer formwork 2 and the inner formwork 1. 3 forms a square cylindrical molding space 8 as shown in FIGS. 6 and 7. And the groove 5 is the inner formwork 1
It opens into the flat plate part 9 of the molding space 8 from the inner surface of the molding space 8 . Note that a hole 14 is provided in the center of the end plate 4 of the inner formwork 1 so that mortar can be inserted thereinto.

Mortar is uniformly inserted into the inner formwork 1 assembled in this way from the hole 14 along the extending direction of the groove 5, and the tire 12 is placed on the rolling wheels of a centrifugal machine as in conventional centrifugal molding. The molding is performed by rotating the mortar and filling the molding space 8 through the mortar grooves 5 in the inner mold frame 1 with centrifugal force.

A rubber packing is interposed between the outer periphery of the end plate 4 and the inner surface of the outer formwork 2 to prevent mortar from leaking. As the inner frame element 3, a columnar element having a fan-shaped cross section as shown in FIG. 7 may be used. In addition, when making a cross section with a large side length, as shown in Figures 6 and 7, the cross section should have one straight line and one curve (fold), such as a triangular mountain shape or an arcuate mountain shape. The inner formwork 1 may be constructed by arranging an intermediate inner formwork element 13 having a columnar cross section consisting of a wire between the inner formwork elements 3 forming the inner surface of the corner of the rectangular tube to be molded. The number of intermediate formwork elements 13 disposed between the formwork elements 3 is not limited to one as shown in the figure, but a plurality can also be used. In this way, it is possible to improve the flow of mortar into the molding space 8 when molding a large-sized product. Before placing the inner formwork 1 in the outer formwork 2, a stainless steel net is wrapped around the inner formwork element 3 assembled into a prismatic shape, a linear reinforcing material such as carbon fiber is further wound thereon, and the mesh is centrifuged. When molded, the reinforcing material wound around it by centrifugal force was embedded in the mortar column while being separated from the surface of the inner formwork element 3. In addition, reinforcing materials such as wire mesh or reinforcing bar cages can also be applied to the mortar in the same manner as in the past.

The formed and hardened mortar tube is removed from the mortar tube by removing the outer formwork 2 from the mortar tube by removing the bolts that interconnected the flanges 11, and then separating the end plate 4 from the inner formwork element 3 and removing the outer formwork 2 from the mortar tube. The inner formwork elements 3 are taken out one by one from the inside and separated from the formwork. The amount of mortar to be injected is used so that the inner surface of the molded mortar tube does not bulge at the groove 5 portion and is molded flush with the flat plate molding surface 6.

[Effect]

In the present invention, the inner formwork is shorter than the length of the outer formwork.
By arranging them in one row inside the outer mold, a plurality of rectangular tubes can be efficiently formed at the same time. At least one for guiding mortar into the forming space of each plane part of the square tube to be formed.
Since two grooves will be provided, mortar can be completely supplied to the corners of the molding space from both sides.
Even with a rectangular tube with a thin wall thickness such as 10 mm, a perfect rectangular tube without any insufficient areas around the mortar can be obtained. Since the inner formwork is wrapped in the outer formwork, it is easy to assemble the outer formwork and the inner formwork and to remove the outer formwork.The inner formwork can also be assembled by removing the end plates from the inner formwork elements. Can be easily separated from the product. Incidentally, since the other surfaces of the inner formwork element and the intermediate inner formwork element are inclined with respect to the plane on which the flat plate part is formed, the flow of mortar into the groove can be made smooth.

〔Effect of the invention〕

According to the present invention, it is possible to efficiently manufacture a mortar tube having a rectangular shape both inside and outside, and having a high packing density and uniform quality.

Therefore, it is possible to manufacture a rectangular mortar tube having a thickness of 10 mm and having a reinforcing material such as glass or long carbon fiber embedded therein.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the inner formwork according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of one of the inner form elements of FIG. 1, and FIG. 5 is a side view of FIG. 4, and FIG. 6 is an embodiment of the inner formwork using intermediate inner formwork elements. FIG. 7 is an explanatory diagram of another embodiment of the inner formwork using intermediate inner formwork elements. 1... Inner formwork, 2... Outer formwork, 3... Inner formwork element, 4... End plate, 5... Groove, 6... Flat plate molding surface, 7... Corner molding surface, 8 ...Molding space, 9...
Flat plate part, 10... Bolt, 11... Flange, 1
2... Tire, 13... Intermediate inner formwork element, 14...
...hole.

Claims (1)

[Scope of Claims] 1. A plurality of one or both inner formwork elements each having a triangular and fan-shaped cross section and having the same prismatic shape as the inner shape of a rectangular tube having a rectangular inner and outer cross section; The flat plate forming surfaces of adjacent inner formwork elements are arranged so as to form a groove along the longitudinal direction thereof, and end plates having approximately the same external shape as the cross-sectional shape of the square tube are provided at both ends thereof. An inner formwork removably attached to be concentric with the prismatic shape is attached to one inner surface of the outer formwork, which has an inner surface having the same cross-sectional shape as the outer shape of the rectangular tube and is divided into two diagonally. , insert the above-mentioned inner formwork, stack the other outer formwork on top of it, assemble the outer formworks into a cylindrical shape, wrap the inner formwork, and insert it into the inner formwork through the hole provided in the center of the end plate. A method for manufacturing square mortar tubes by inserting mortar and centrifugally forming it. 2. A plurality of one or both of columnar inner formwork elements having a triangular and fan-shaped cross section are formed into the same prismatic shape as the inner shape of the rectangular tube whose inner and outer cross sections are square, and the inner formwork elements that are adjacent to each other are shaped like a prism. A groove is arranged between the flat plate forming surfaces of the element to form a groove along the longitudinal direction of the element, and end plates having approximately the same external shape as the cross-sectional shape of the square tube are provided at both ends thereof, and are concentric with the square columnar shape. A formwork for manufacturing a mortar square pipe, which is composed of an inner formwork removably attached as shown in the figure, and an outer formwork divided into two on a diagonal line and having an inner surface having the same cross-sectional shape as the outer shape of the above-mentioned square pipe. . 3 One or both of the columnar inner formwork elements having a triangular or fan-shaped cross section, and a plurality of columnar intermediate inner formwork elements having a cross section surrounded by one straight line and one chevron curve are referred to as inner formwork elements. and intermediate inner formwork elements are alternately positioned so that the inner and outer cross sections to be formed have the same prismatic shape as the inner shape of the rectangular square tube, and the flat plate of these inner formwork elements and the intermediate inner formwork element is formed. A groove is arranged between the forming surfaces of the section so as to form a groove along the longitudinal direction of the section, and end plates having an outline approximately the same as the cross section of the square tube are removed from both ends of the end plate so as to be concentric with the square column. A formwork for manufacturing a mortar rectangular pipe, comprising an inner formwork that can be attached, and an outer formwork that has an inner surface having the same cross-sectional shape as the outer shape of the rectangular pipe and is divided into two on a diagonal line.