JPH11210136A - Tubular driving form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate execution by providing multiple parallel irregular straps on a substrate made of a thin steel sheet, providing many small through holes on the irregular strap faces to form a driving form, providing flat sections parallel with the irregular straps at the prescribed positions, and bending the substrate. SOLUTION: A driving form 1 formed with a substrate 10 of a band-like zinc-plated steel sheet is molded, many V-shaped irregular straps 2 continued from an edge 11 to the other edge 11 in the short width direction are arranged in parallel on this driving form 1, and through holes 3 are bored on the slant faces 21 of the irregular straps 2. When the driving form 1 is formed, flat sections 4 having no irregular straps 2 are formed at two positions in the direction crossing the irregular straps 2 from one edge 11 to the other edge 11, and the driving form 1 is perpendicularly bent at two flat sections 4 to form the whole into a semicylindrical shape, and a semicylindrical driving form 1A is molded, thereby it is easy to bend, and its length can be finely adjusted when the width of the irregular straps 2 is expanded or shrunk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical driving form used for a solidifying material having fluidity such as concrete and mortar.

[0002]

2. Description of the Related Art Conventionally, paper cylinders have been used as concrete forms such as pillars. When a paper cylinder is used, it is necessary to cut the cylinder at the time of demolding, and reuse is impossible. Further, since the casting surface becomes smooth, there is also a problem that the smooth surface must be roughened when a finishing material is applied.

[0003] As a special case of a column-shaped formwork, when constructing a concrete formwork on a slope, a semi-cylindrical body made of a cement product is placed with an opening below, and the opening is made of a water-permeable sheet. A method of closing the object into a cylindrical body and pouring concrete therein has been used. Was. Cement products are extremely inefficient because the mortar spraying method requires manual work on the slope, and the concrete formed is
Since a large amount of air is involved, there are many voids, and it is difficult to mix coarse aggregate. There were difficulties such as.

[0004]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an inexpensive, easy-to-use, and wood-free formwork, and more particularly, to a method of forming a formwork on columns, beams, and slopes. It is intended to provide a driving formwork used at the time of setting.

[0005]

According to the present invention, a substrate made of a thin steel sheet is
Provide a plurality of uneven stripes parallel to each other that are connected from end to end, provide a number of small through holes in the uneven stripe surface to form a driving form, and provide a plane portion parallel to the uneven stripe at predetermined locations , The substrate is bent or bent at this flat part,
Alternatively, it is formed in a semi-cylindrical shape or an angle shape. When forming a small through-hole, it is an effective method not to completely punch out the hole but to leave a slag on the edge of the hole, which is called burring. In the case of the conventional plywood form, it is necessary to remove the form after the concrete has hardened, but in the case of the legal form of the present invention, the form is left in the concrete as it is. In that sense, it is one of the collectively referred to as a driving formwork.

[0006] When used to form a concrete beam on a horizontal beam or a slope of a building, when forming a single plate-like frame, two flat surfaces parallel to the uneven strip are required. A semi-cylindrical mold that is bent at a substantially right angle in the plane portion is used. When used for a legal frame, a flexible sheet-like material with a sufficient width is stretched between two open edges, and the fabric surface is installed facing the mountain, so that it is possible to cope with irregularities. Use it as In any case, usually after arranging rebar inside, concrete is poured and the used formwork is not removed,
Leave with concrete as it is.

[0007]

In the cylindrical driving form formed as described above, the unevenness acts as a rib, so that even if a thin steel plate having a thickness of about 1 mm is used, the rigidity of the surface is increased.
Further, when a large number of uneven stripes are formed in parallel, the rigidity in the direction crossing the uneven stripes is large, and the rigidity in the direction parallel to the uneven stripes is small. For this reason, it is easy to bend, and fine adjustment of the length becomes possible by expanding or reducing the width of the uneven strip. By reducing the width of the uneven strip at one end of the edge and expanding the width of the uneven strip at the opposite edge, the band-shaped plate can be bent to some extent in the plane, so it can adapt to the unevenness to some extent, It is convenient to use it in places where there is.

[0008] A large number of small through-holes are formed in the uneven surface. When concrete is poured, mortar and cement milk leak from the through holes and adhere to the surface of the steel plate,
It is possible to prevent iron from rusting, and it is possible to fill uneven ridges and finish the flatness. If the through-hole is too large, coarse aggregate of concrete will also flow out. Therefore, the through-hole is generally limited to a diameter of 1 cm or less.

If the through holes are provided, it is convenient to connect the molds through the holes or to keep the space between the molds. When a rigid rod-shaped body such as a reinforcing bar is attached in the direction crossing the through hole and crossing the uneven strip, the rigidity in the cross direction with the uneven strip can be reinforced, and the strength of the entire surface is large. Can be obtained.

[0010] Cement milk prevents rust on the steel sheet. However, in the case of poor use conditions or high demand, a recently developed ultra-thick galvanized steel sheet having a zinc plating of 900 g / m 2 or more on both sides is used. It is desirable to use.

[0011]

Embodiment 1 FIG. 1 shows an example of a driving formwork 1 formed from a strip-shaped galvanized steel plate substrate 10 having a thickness of 1 mm. The overall width is 1 meter and the length is 2 meters. In this driving form, a large number of concavo-convex strips 2 each having a V-shaped cross section and continuous from a short edge 11 to a short edge 11 are arranged in parallel at a narrow interval. The size of the cross section of the uneven strip is 10 mm in depth, the width of the upper end of the uneven strip is 15 mm, and a substantially circular through hole 3 having a diameter of 5 mm is provided on the slope 21 of the uneven strip at intervals of 5 cm. It is attached.

When forming such a driving form, a flat portion 4 having a width of 10 cm without an uneven strip from edge to edge is formed at two places in a direction crossing the uneven strip. As shown in FIG. 2, the driving form is bent at a right angle by the two flat portions 4, and the whole is formed into a half-cylinder shape to obtain a half-tubular driving form 1 </ b> A. It is convenient to use it when making beams when building a building. When casting a concrete method frame on a slope, such a semi-cylindrical driving form 1A is used with the opening portion down and the opening portion covered with a flexible sheet-like material. This is convenient because there is no leakage and the surface can be adapted to the unevenness of the slope.

As shown in FIG. 3, a cylindrical driving form 1B refracted at an angle of a right angle or more and having a triangular cross section.
It is also possible to use Although it is troublesome to make a triangular concrete column in the conventional method, it can be formed very easily by such a method.

It is also possible to form a flat part 4 at three places on the substrate and to bend at right angles at each of the flat parts to form a cylindrical driving form having a quadrangular cross section as shown in FIG. It is. This is convenient when placing columnar concrete. The cylindrical driving form of the present invention is formed of a thin steel plate as a whole and has a shape like an accordion, so that it has a certain degree of flexibility. Moreover, since it is formed of a thin steel plate, it is lightweight, and can be transported by human power. Once formed into a cylindrical shape, it can be expanded at the joints and installed around the assembled rebar, so that a columnar form can be easily constructed.

In the longitudinal direction, the ridges serve as ribs, so that the rigidity increases, which is convenient for assembling a so-called fluttering material. As shown in FIG. 5, in some places, cross the through hole 3 of the slope 21 of the uneven strip 2,
It is also possible to reinforce through the reinforcing bar 5 or the like. Reinforcement is convenient for maintaining the flatness of the formwork during construction, and if left in place and driven into concrete, strength will also be positive.

It is not necessary to remove the mold of the present invention after casting the concrete. The surface of the cast pillar is not mirror-finished like a pillar cast using a paper tube, but the surface of the cast pillar has irregularities 2 so that mortar easily adheres and finish material installation is easy. Also, the adhesive strength is high, and there is no fear of peeling. Through-hole 3 formed on uneven surface
If a projection is provided by a so-called burring process that projects outward, it is convenient because the attachment of the finishing material is easier and more reliable.

[0017]

Embodiment 2 FIG. 6 shows another example of the driving formwork. On a 1-mm-thick strip-shaped galvanized steel plate substrate 10, a large number of concavo-convex strips 2 each having a V-shaped cross-section that is continuous from a short edge 11 to a short edge 11 are arranged in parallel at narrow intervals. The size of the cross section of the uneven strip is 10 mm deep, the width of the upper end of the uneven strip is 15 mm,
A substantially circular through-hole 3 having a diameter of 5 mm is provided at intervals of 5 cm on the slope 21 of the uneven strip.

The same shape using the same material as the previous embodiment is different from the previous embodiment in that the entire width of the driving form 1 is as narrow as 30 cm and the width is slightly in the center. A single flat portion 4 having a wide width of 15 cm is formed. The flat portion 4 is bent at a slightly larger curved surface to form a bent portion 41. On both sides of the bend,
Each of the joints 42 is formed of three concavo-convex strips 2. The angle at which the joints intersect is a right angle.

The driving form 1 of this embodiment is convenient to be used when the flat driving form 1 is connected to a column shape or the like. In this case, it is not denied that the uneven portion is also provided in the R portion of the corner.

The main purpose of the driving formwork 1 of the present invention is to form a beam or a column by forming a half-tubular or cylindrical shape and driving concrete / mortar or the like inside.
It does not limit the use. For example, it can also be used for applications such as using a cylindrical driving form to punch concrete on the outside and forming a cylindrical hollow portion on the inside.

As shown in FIG. 7, a flexible sheet-like material 5 is bonded to the inner surface of the driving form 1 and a rigid thin plate 6 is bonded to the outer surface thereof.
Σ is also possible. The sheet-like material can prevent the concrete or mortar to be poured from flowing out of the through-hole excessively, or use a finely permeable sheet-like material to escape the excess water of concrete. It is possible. It is also possible to attach a thin flat plate 6 serving also as a finishing material to the outer surface, or attach a styrofoam plate and simultaneously apply a heat insulating material.

[0022]

Since the present invention is configured as described above, the following effects can be obtained. Since it is made of one thin steel plate, it is high strength in spite of its light weight. 2 Although it is formed of a thin steel plate,
A large second moment of area can be obtained. A design that can withstand the pressure of concrete casting is possible. Since it is formed of three thin steel plates, it is easy to perform cutting and the like without using a large-sized machine on site. When a large number of four parallel uneven portions are formed, the uneven portions can be bent to some extent in a manner that one of the uneven portions is widened and the other is narrowed, and it is possible to adapt to unevenness. 5. Since many through holes are provided, the air contained therein is extruded together with the concrete mortar, so that dense and high-strength concrete without bubbles can be poured. Because it is a 6-punch formwork, after concrete is cast,
No disassembly / disposal is required, which helps to save labor. 7 pillars
A beam formwork can be easily formed. Since the surface is roughened, it is easy to attach a finishing material. 8 It is also useful for maintaining the environment of the earth because it does not need to use wood resources.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a driving formwork.

FIG. 2 is a perspective view showing an example of a semi-tubular driving formwork.

FIG. 3 is a plan sectional view showing an example of a tubular driving formwork.

FIG. 4 is a plan sectional view showing another example of the tubular driving formwork.

FIG. 5 is a partial perspective view showing an example of a method for reinforcing a driving formwork.

FIG. 6 is a plan view showing another example of the driving formwork.

FIG. 7 is a plan sectional view showing an example of a composite driving formwork.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Driving form 1A Half-tubular driving form 1B Cylindrical driving form 1Σ Composite driving form 2 Concavo-convex strip 21 Slope 3 Through hole 4 Flat part 41 Bent part 42 Joint part 5 Sheet 6 Thin plate

Claims (6)

[Claims] 1. A substrate made of a thin steel plate,
Providing a plurality of concavo-convex strips from end to end of the substrate, on the concavo-convex strip surface, in a driving form provided with a large number of small through holes, at one or more predetermined locations, substantially parallel to the concavo-convex strips A flat portion having a predetermined width is formed, and the substrate is bent or bent at the flat portion, and is formed into a tubular shape having a completed cross-sectional shape, or a semi-tubular shape, or an angle shape. , Cylindrical driving formwork. 2. The cylindrical driving form according to claim 1, wherein one or more rigid rods penetrating the plurality of small through holes are provided in a direction intersecting the concave and convex strips. 3. The cylinder according to claim 1, wherein all or a part of the slag of the substrate projects from the substrate at the edge of the small through hole. Forming formwork. 4. A semi-cylindrical driving form, wherein a flexible sheet-like material is stretched between two edges of an opening surface to form a complete cylindrical shape. Item 3,
Cylindrical formwork. 5. A flexible sheet-like material is attached to an inner surface and / or an outer surface of a semi-tubular or cylindrical driving form. The cylindrical driving formwork described. 6. The cylindrical shape according to claim 1, wherein a plate-like body is bonded to an inner surface and / or an outer surface of the semi-cylindrical or cylindrical driving form. Driving formwork.