JPS5810633B2 - Manufacturing method of synthetic resin tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a tube using a synthetic resin sheet material, and more particularly, to a method of manufacturing a tube that allows assembly and manufacturing at a piping site.

For example, culvert drainage pipes are used in large areas such as golf courses, reclaimed land, and reclaimed land, but most conventional culvert drainage pipes are preformed into a predetermined pipe shape.

Moreover, this culvert drainage pipe is made of highly rigid material to prevent it from being crushed when buried underground, so it is practically impossible to wrap it around a drum etc. during transportation, and even if it is forced to If the tube is wound too tightly, the shape of the tube will be crushed and it will become unusable.

Therefore, we usually use straight tube-shaped products cut to the required dimensions,
A large number of these are used by joining them together at the construction site.

However, in this case, it is necessary to transport the culvert drainage pipes in a stacked state, resulting in a very large volume.In other words, only a small amount can be transported at a time, which increases transportation costs, and it is difficult to transport in a large area. When burying, it is necessary to join many pipes together, which is extremely time-consuming and inefficient.Moreover, with the straight drain pipes, it is not possible to save labor in the burying work by using mechanical force. It is.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a method for manufacturing a tube that can be easily assembled and manufactured using synthetic resin sheet materials.

Therefore, in the present invention, seven-shaped grooves extending in the longitudinal direction having a V-shaped cross-sectional shape are formed at multiple locations in the width direction, and concave or convex strips extending in the width direction are formed in the longitudinal direction so as to connect the V-shaped grooves. By using a synthetic resin sheet material formed at appropriate intervals, bending this sheet material in the width direction so that the groove surfaces of each of the 7-shaped grooves are in contact with each other, and fixing it in a tubular shape with an appropriate fixing means, a pipe is formed. The present invention provides a method for assembling and manufacturing a body.

By doing this, the sheet material can be rolled and stored in a long length on a drum or the like before assembling the pipe body, making it possible to transport a large amount at one time and assembling the sheet material in the long state at the piping site. This makes it possible to eliminate or reduce the labor required for conventional joints, thereby saving labor in piping construction work, and the assembly work is also simple. By reinforcing the body wall surface with concave or convex stripes, the load applied to the tube body is received by the abutting surface, resulting in a tube body having high crush resistance.

When the upper or convex stripes are formed by concave grooves that intersect with the 7-shaped grooves, the flexibility of the sheet-like material is improved and the reinforcing effect is also large.

Next, one embodiment of the present invention will be described with reference to the drawings.

First, in Figures 1 to 3, 1 is made of synthetic resin.
It is a long sheet-like material, and has a large number of grooves 2 extending in the width direction at predetermined intervals in the longitudinal direction of the sheet-like material 1.
In addition, in the width direction of the sheet material 1, a plurality of seven-shaped grooves 3 having a V-shaped cross section and extending in the longitudinal direction are formed at equal intervals depending on the shape of the tube to be assembled.

This 7-shaped groove 3 is formed so that when the sheet material 1 is bent into an annular shape in the width direction to form a tube, each of the groove surfaces 3a, 3a thereof are in contact with each other, as shown in detail in FIG. 3, for example. In the case of an octagonal tube as shown in Figure 2, the groove should be approximately 45 degrees, and in the case of a hexagonal tube, the groove should be approximately 6 degrees.
Form a 0 degree groove.

The angle of this 7-shaped groove 3 is actually formed slightly smaller,
When forming a tube, the groove surfaces 3a, 3a are pressed against each other.

In addition to increasing the bending rigidity of the tube wall surface, the grooves 2 in the width direction also have the effect of increasing the flexibility of the sheet material 1 despite the formation of the 7-shaped grooves 3. To make it easy to wind and store a long length on a drum or the like.

If the sheet material 1 is made of a material that is easy to bend, protrusions may be formed on the back or front side instead of the grooves 2 to increase only the bending rigidity of the tube wall surface.

The same applies when the sheet material 1 is wound with a large radius of curvature.

U-shaped locking members 4, 4 are integrally provided at both ends in the width direction of the sheet-like material 1, and the sheet-like material 1
When assembled to form a tube, the respective locking members 4, 4 are brought into contact with each other to form a rectangular tube shape, and the engaging member 5 having a C-shaped cross section is fitted onto each of the members 4, 4, The sheet material 1 is fixed in a predetermined tubular shape.

As the means for fixing the tubular body, other appropriate means may be adopted, for example, a cord or the like may be used to tighten the circumference of the tubular body. In particular, in this case, the groove surface of each of the seven-shaped grooves 3 3a
, 3a are pressed against each other, and by tightening the string, the shape-retaining force of the tube body becomes even stronger.

Further, when the pipe body is used as an underdrain drainage pipe, as shown in each figure, a large number of through holes 7 are bored in each convex part 6 surrounded by the concave groove 2 and the figure 7 groove 3 of the sheet material 1. Through hole 7
It can be made to absorb water from.

The through hole 7 is not limited to the convex portion 6, but may be provided at other locations.

The through holes 7 can also be formed by forming a large number of small protrusions 8 projecting from the top surface of each convex portion 6, as shown in FIG. 4, and scraping off the small protrusions 8 with a cutter.

Incidentally, in order to form the through hole 7, a part of the convex portion 6 may be cut with a cutter, and the cut portion may be made into a through hole.

Furthermore, when the pipe body is used as a blind culvert drainage pipe or other use, the through hole 7 is not formed.

The sheet-like material 1 is made of a single synthetic resin thin plate,
It can be easily manufactured by suction molding the thin plate along a mold.

By the way, the shape of the tube to be manufactured is such that the top surface side of the convex portion 6 in the sheet material 1 is formed into an arc shape, and when assembled, the outer surface side is polygonal and the inner surface side is circular, as shown in FIG. It may be made to have a shape.

Alternatively, the bottom side of the convex portion 6 in the sheet-like material 1 may be formed into an arcuate shape so that when assembled, the inner side is polygonal and the outer side is circular, as shown in FIG.

Furthermore, the top and bottom surfaces of the convex portion 6 may be arcuate to form a tubular body having circular surfaces on both the inner and outer surfaces.

When laying the above-mentioned pipe as an underdrain drainage pipe, the sheet-like material 1 is wound and stored in a long state on a drum, etc., and the entire drum is mounted on a trencher, and a trench is dug with the trencher. At the same time, as the sheet material 1 advances, the sheet material 1 is sequentially fed out, and at the time of this feeding, the sheet material 1 is assembled into a tube shape using a sizing body and fixed in a predetermined shape, thereby manufacturing the tube body and laying it in the groove. The tube body is buried in the groove.

According to the method for manufacturing a synthetic resin tube body of the present invention, as is clear from the above description, seven-shaped grooves extending in the longitudinal direction having a V-shaped cross section are formed at multiple locations in the width direction, and the V-shaped grooves are formed at multiple locations in the width direction. By using a sheet-like material in which concave or convex stripes extending in the width direction are formed at appropriate intervals in the longitudinal direction so as to connect the grooves,
A tubular body can be easily manufactured by bending this sheet-like material in the width direction so that the groove surfaces of the seven-shaped grooves are in contact with each other, and assembling and fixing it into a tubular shape.

Therefore, since the pipe can be manufactured by assembling the sheet materials at the place where the pipe is to be laid, it is possible to transport large quantities of material at low cost by transporting the sheet material to the place where the pipe is to be laid. Since the body length can be selected, the work required to connect the pipe bodies can be minimized, and the cost of piping construction can be dramatically reduced.

Furthermore, the manufactured tube has great crush resistance because the groove surfaces of the 7-shaped grooves are in contact with each other and the tube wall surface between the groove surfaces is reinforced with concave or convex stripes.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a sheet-like material according to an embodiment of the present invention, FIG. 2 is a perspective view of a tube manufactured by assembling the sheet-like material, and FIG. 3 is an enlarged cross-sectional view of the main parts. FIG. 4 is a cross-sectional view illustrating the means for forming the through hole, and FIGS. 5 and 6 are drawings showing other examples of the tube body. 1 is the material, 2 is the groove (concave or convex), 3 is the 7-shaped groove, 3a
6 is a groove surface, 6 is a convex portion, and 7 is a through hole.

Claims (1)

[Claims] 1. 7-shaped grooves extending in the longitudinal direction with a 7-shaped cross-sectional shape are formed at multiple locations in the width direction, and concave or convex strips extending in the width direction are formed in the longitudinal direction so as to connect the V-shaped grooves. A synthetic resin tube body characterized in that a sheet material made of synthetic resin formed at appropriate intervals in the direction is bent in the width direction so that the groove surfaces of each of the seven-shaped grooves are in contact with each other, and then assembled and fixed in a tube shape. Production method. 2. The method of manufacturing a synthetic resin tubular body according to claim 1, wherein the sheet-like material is fixed in a tubular shape by engaging retaining members on both widthwise edges of the sheet material.