JP2549286Y2 - Concrete formwork made of paper tube - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete casting formwork using a continuous paper cylinder.

[0002]

2. Description of the Related Art Casting concrete pillars of a building,
In order to open holes for laying pipes and wiring in concrete walls and floors, holes for installing protective fences on roads, and many holes for reducing the weight of buildings For example, a mold using wood, iron, or a synthetic resin, or a mold made of paper tube is used.

For example, in the case of a paper tube mold, a cardboard is formed by winding a plurality of layers of cardboard into a spiral shape and forming a waterproof wet film layer such as a synthetic resin film or a synthetic resin coating on the inner and outer surfaces thereof. I have. This paper tube mold is itself lighter than iron or synthetic resin, it is easy to transport and handle, and it is also excellent in various workability such as cutting and connection. In addition to the labor saving in assembling work, the cost can be reduced.

[0004] Further, the surface of a building cast by the paper tube mold is smooth and excellent in finish. For example, when a paper tube is used as a form for a pillar of a building, a connecting bar connecting the form is used, as in the case of using a metal frame that can be divided into two to four parts on the surface of the pillar. Since the smoothness of the inner surface of the paper tube is transferred as it is without any irregularities or steps, the surface smoothness is good. Further, when the form is removed from the building after the concrete is hardened, the work of removing the form is easy because the form can be broken.

[0005]

For example, a paper tube commercially available as a mold has a large diameter of generally about 500 to 1200 mm and a standard length of 4 m, which is quite large. Things. In many cases, the surface is printed with the name and trademark of the manufacturing maker, various symbols, commercials, and the like, and plain materials are used for a small number.

[0006] However, even a paper tube mold having the above various excellent characteristics has the following problems. (1) When installing a formwork on a construction site, the formality of the formwork (verticality of columns) or horizontality (horizontality of beams)
However, since the above-mentioned symbols, characters, and figures are entirely printed on the surface of the formwork, even if lines or marks are drawn on the surface, it is almost inconspicuous. However, there is a problem that the operation is complicated. (2) A ballpoint pen or the like is used to draw a line on the surface of a paper tube mold. However, the line formed by this method is as thin as 1 mm or less. Further, when a thick line is drawn with a magic pen or the like having a size of about 3 to 5 mm in order to improve this drawback, there is a problem that the base point becomes unclear and errors in drawn figures and the like increase.

[0007] The reference point means a reference point when drawing a figure on the surface of the mold and a reference point for measurement. It is obvious that the reference point is unclear. The lines indicating the figures and dimensions to be drawn are also unclear. The present invention
It is to eliminate the disadvantages of the concrete form,
It is an object of the present invention to provide a mold that facilitates measurement of dimensions, angles, positioning, and the like, and that has improved dimensional accuracy during processing and installation.

[0008] Still another object is to inscribe positioning for connecting a separate formwork such as a beam to the surface of the formwork based on the design drawing of the building, and to draw a thin black line on a cut-off portion serving as a connection portion. Another object of the present invention is to provide a concrete formwork capable of improving the accuracy of construction work such as marking with a black ink mark for positioning a reinforcing member or the like.

[0009]

According to the present invention, there is provided a cylindrical concrete form made of a paper tube, wherein the form is erected vertically before placing concrete. In the vicinity of both ends of the surface, a pair of symbols having a base portion formed by reducing the tip so as to be located on the same line parallel to the axis of the formwork are provided so as to face each other, and are separated in the circumferential direction. At least a pair of symbols having a base portion formed by reducing the tip portion so as to be located on the same line parallel to the axis of the mold near both ends of the surface of the mold are provided so as to face each other, and the upper end of the mold is further provided. This is a concrete form made of a paper tube provided with at least one cut-out portion in the diameter direction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below. That is, the formwork 1 for constructing a concrete pillar has an appearance as shown in the perspective view of FIG. The mold 1 is made of a paper tube, and includes an outer layer 2, an intermediate layer 3, and an inner layer 4, as shown in FIG.

The outer surface layer 2 is made of a film made of polyethylene, polypropylene, polyester, or the like, or a waterproof and moisture-resistant layer 2a made of a coating layer of paraffin wax, waterproof resin paint, or the like, and a paper layer 2b (a label layer on which characters and figures are printed). The intermediate layer 3 is a layer mainly having strength and is formed by spirally winding a plurality of strip-shaped cardboards, and the inner surface layer 4 is formed of the same material as the water-resistant wet layer 2a. It is composed of a wet layer 4a and a paper layer 4b, and a water-resistant wet layer 5 is adhered to an end face thereof.

The water and moisture resistant layer 5 is formed by coating a resin or by laminating a waterproof moisture film. Reference numeral 4c denotes a connection portion of the spiral inner surface layer 4, and 2c denotes a connection portion of the outer surface layer 2, and these connection portions are formed in abutting shape of the edge portions of the respective members, and in the edge portions of the members. Each member is stuck so as to be in a polymerized state.

By the way, the connecting portion on the side (outer layer or inner layer) which is in contact with concrete is heat-sealed or pasted with a film tape of polyethylene, polyester, or the like, and cut or polymerized in abutting manner. It covers the exposed cut surface on one side to prevent water and moisture from entering. The cross-sectional shape of the mold 1 is generally most suitable in a cylindrical shape, and is used in large quantities. However, square, triangular and other cross-sectional shapes are also employed.

A pair of symbols 6 and 7 are provided near both ends of the mold 1 in parallel with the axis of the mold 1.
These symbols 6 and 7 have a shape with at least the tip part reduced so that it can be used as a base point P at the time of drawing for restricting the posture when the formwork 1 is installed in a predetermined place. Is preferred. The specific shape of the symbols 6 and 7 is “drop shape or wedge shape” in this embodiment.
The reduced end forms a base point P. The specific dimensions of the symbols 6 and 7 include a wide portion b
Is 2 cm, the length l is 15 cm, and the base point P at the tip is
In order to accurately display even if the end face is deformed, it is preferable to form the mold 1 at a distance D of about 20 cm from the end of the formwork 1 inward from the end.

Since the symbols 6 and 7 serve as reference points for determining the dimensions, it is necessary to provide the base points P and P so as to be parallel to the axis of the mold 1 and to be opposed to each other so as to form a pair. Above is convenient. Usually, two pairs of symbols 6 and 7 are provided in the circumferential direction of the mold 1 as shown in FIG. 1, but at an angle of 30 °, 45 °, 60 °, 90 °, 120 ° or the like in plan view. The distribution is rich in versatility.

A line perpendicular to the axis can be drawn by arranging two or more symbols 6 or 7 in the circumferential direction and connecting the base point P or a predetermined designated point. Therefore, by cutting along this line, it is possible to cut in a cross section orthogonal to the axis. When many symbols 6 and 7 are provided on the peripheral surface of the mold 1, it is preferable to use figures and the like having different shapes in order to avoid confusion of a large number of symbols. Also, if the distance between the adjacent symbols is small, it is easy to mistake the paired symbols 6 and 7 provided at both ends of the mold 1, so a number indicating the order is provided in the symbols 6 and 7. Is good.

FIG. 3 shows a state in which symbols 6 and 7 are effectively used when the formwork 1 is installed as a pillar of a building. That is, a pin 10 is planted at the base point P of the upper symbol 6, one end of the thread 11 is connected to the pin 10, and the tip of the weight 12 attached to the other end is set at the base point P of the lower symbol 7. The shape of the mold 1 is adjusted by adjusting the attitude of the mold 1 so that the weight 12 lowered from the base point P of the upper symbol 6 which is simultaneously separated in the circumferential direction also matches the base point P of the lower symbol 7. The verticality of the frame 1 is secured, and thereafter, the mold 1 is fixed via a separate member so as not to move.

Even if the verticality of the formwork 1 is lost after the arrangement, the hanging of the weight 12 makes it possible to identify the form 1 at a glance, and the installation work can be carried out smoothly. Fig. 4 shows examples of various symbols 6 and 7, (a) Fig. 4 is a diamond shape, (b) is a star shape, (c) is a one-letter shape, (d) The figure is triangular, the figure (e) is magatama, the figure (f) is a pigeon, the figure (g) is a human figure,
(h) shows an arrow shape, (i) shows a double arrow shape, and (j) shows a V shape. The symbols (or graphics) shown in FIG. 4 are merely examples, and various other types may be employed depending on the use, the size of the mold, and the like. It is necessary that the various symbols have at least one sharp tip which becomes a base point P by being reduced from an appropriate portion.

As a method of attaching the symbols 6 and 7 on the mold 1, printing is usually adopted on the outer layer 2 and the inner layer 4. It is also possible to adopt a method of sticking a label printed with "".
The positions where the symbols 6 and 7 are provided on the mold 1 are hidden even if the tape for the water-resistant and wet-resistant layer 5 is adhered, provided that the base point P is at least 2 cm closer to the center than the opening end of the mold 1. It is not.

However, the end of the mold 1 may be damaged during handling or transportation of the mold 1, so that depending on the size of the mold 1, the base point P is about 5 cm away from the open end. Good position. As described above, a pair of symbols 6 and 7 having at least a pair of base points P are provided at both end portions of the form 1 in parallel with the axis of the form 1, so that the base points of the symbols 6 and 7 are provided. By using P, the posture of the formwork 1 is adjusted, fixed to an optimum state, and concrete can be driven. [Embodiment 2] FIG. 5 shows a second embodiment which is an application of the first embodiment, in which a cutout 15 is formed in the upper end portion of a column form frame 1 in the diameter direction. The beam form 1 using this cutout 15
6 is connected.

In providing the cutout 15 in the diametrical direction (on the diagonal line), measurement is performed using the base point P of an arbitrary symbol 6 as a base point based on an architectural blueprint, and after drawing and marking with a thin line, The cutting portion 15 for fitting and fixing the beam formwork 16 is cut off using the line and the symbol 6 as marks.
The base points P of the pair of symbols 6 and 7 provided at both ends of the mold 1 are on a vertical line in advance, and the bases P of the symbols 6 and 7 located on the opposite side are the center of the diameter of the form 1. Are provided on the diagonal line passing through 30 cm closer to the center of the opening end than the opening end, so that dimensions and angles with high accuracy can be accurately measured.

When the formwork 1 is to be installed at a predetermined place in a building, the direction of the cutout 15, that is, the beam formwork 16, is determined by the cutout 15 and symbols 6 and 7, so that the formwork 1 is erected. can do. When the base point P is connected in the horizontal direction (a direction perpendicular to the axis), the base point P is perpendicular to a vertical line connecting a pair of base points P facing each other in the lengthwise direction, and construction can be easily performed. . [Embodiment 3] Fig. 6 shows an example of a building in which beams are provided in a cross shape, and a cutout portion is formed at an upper end portion of a column formwork 1 with reference to a symbol 6 and its base point P. 15 is measured and drawn, and the portion is cut off. In addition, the position where the base point P (upper) of the upper symbol 6 is attached is set at 80 cm closer to the upper end before the cutting of the formwork 1.
The distance between the base point P below the lower symbol 7 and the lower end of the frame 1 is 20 cm. The distance from the adjacent base point P is divided into four equal parts of the caliber.

According to the above configuration, the symbols 6 and 7 remain even after the end portion is cut off, which is convenient for the construction such as measuring the verticality of the subsequent standing or determining the installation direction. is there.
As another embodiment, although not shown, the form 1
The symbols 6 and 7 can also be given to the inner surface of. That is, when the diameter of the mold 1 is a large diameter of 1000 mm or more,
Cutting part 15 based on the architectural blueprint in the above embodiment
It is considered that measurement and marking, drawing, and cutting processing necessary for cutting off the parts are facilitated.

[0024]

According to the present invention, a concrete form made of a paper tube according to the present invention has a circular shape in which two base points which are vertically opposed to each other are formed on the same line parallel to the axis of the form near both ends of the form surface. Since at least two pairs are provided in the circumferential direction, the weight is hung from the base point of at least two symbols near the upper end in a state where the formwork is arranged in the vertical direction, and the lower end is positioned on a perpendicular formed by the weight. So that at least two bases of
The posture of the formwork can be quickly and accurately adjusted without misunderstanding, and the axis of the formwork can be vertically arranged.

Accordingly, if concrete is poured into the inside or outside of the fixed formwork by adjusting the posture and the concrete form is removed after hardening of the concrete, vertical concrete pillars or vertical holes in the concrete can be easily formed. Can be formed. Further, since at least one cut portion is provided in the upper end portion of the formwork in the diameter direction, a beam formwork can be connected to the cutout portion. When the concrete is cast, the concrete beam becomes seamless. Connected concrete columns can be easily formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a mold.

FIG. 2 is an enlarged sectional view of a portion II in FIG.

FIG. 3 is an explanatory diagram of how to use a pair of symbols.

FIGS. 4A to 4J are diagrams showing examples of various symbols.

FIG. 5 is a perspective view showing a second embodiment of the mold.

FIG. 6 is a perspective view showing a third embodiment of a mold.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Formwork 2 Outer surface layer 2a Waterproof and moisture-resistant layer
2b Paper layer 3 Intermediate layer 4 Inner surface layer 4a Water and moisture resistant layer 4b Paper layer 5 Water and moisture resistant layer 6,7 Symbol 12 Weight
15 Cutout part 16 Beam form P Base point

Claims (1)

(57) [Scope of request for utility model registration] In a concrete form made of a cylindrical paper tube, the form is erected vertically before casting concrete, so that the form is located near both ends of the surface of the form and on the same line parallel to the axis of the form. A pair of symbols, each having a base portion formed by reducing the distal end portion so as to be located at a distance from each other, are provided so as to be opposed to each other, and are parallel to the axis of the mold near both ends of the surface of the mold separated in the circumferential direction. At least one pair of symbols, each having a base portion formed by reducing the distal end portion so as to be located on the same line, are provided so as to face each other, and further, at least one cutout portion is provided at the upper end portion of the formwork in the diameter direction. Concrete formwork made of paper tubes.