JPH08100461A - Culvert pipe and manufacture thereof - Google Patents

Abstract

PURPOSE: To manufacture a culvert pipe with good productivity by spirally winding a beltlike body having a continuous projection recessed on the inner face and heaved on the surface in the longitudinal direction to form a wound pipe main body, and cutting the tops of the projection to form suction holes. CONSTITUTION: A beltlike body forms a bill 1 on one side continued in the longitudinal direction, and the bill 1 is provided with an opening section 2 on the edge side and a space 3 continued to it. A hook head section 4 is formed on the other side of the beltlike body, an inner piece 5 is continued to it, and a projection 6 is integrally molded between the inner piece 5 and the bill 1. The projection 6 is formed with a recess 6a on the inner face and heaved on the surface, and the hook head section 4 is inserted into the space 3 of the beak 1 so that the hook head section 4 is not removed from the opening section 2. The beltlike body is spirally wound to form a wound pipe main body (m) while the hook head section 4 is coupled with the bill 1. A hook-shaped cutter is moved in the longitudinal direction of the wound pipe main body (m), and tops of the projection 6 are cut to form suction ports.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underdrain pipe which is buried underground and absorbs and discharges underground water, and a method for manufacturing the underdrain pipe.

[0002]

2. Description of the Related Art The underdrain pipe shown in FIGS. 9 and 10 is a pipe made of a synthetic resin and has an absorption hole 1 for partially absorbing water.
Many 0s are formed. Surrounding water is absorbed from the absorption holes 10, and the absorbed water is guided to the intended drainage point through the pipe.

[0003]

The absorption holes 10 of such an underdrain pipe can be drilled in a required number and in a required number. However, it is necessary to open a large number of holes 10 one by one in this manner. There was a problem that it took a very long time and productivity was low. Further, in the case of a synthetic resin pipe, when bending it, it is necessary to use a dedicated joint, and even a straight pipe cannot be manufactured for a long length because of storage and transportation reasons. Moreover, in order to manufacture pipes with different diameters, each device was required. Then, the objective of this invention is to obtain the underdrain pipe | tube which opened many holes in the desired location of a pipe wall with high productivity. Further, another object is to facilitate the production of an underdrain pipe having an arbitrary pipe diameter and an arbitrary length according to the requirements of the site of use.

[0004]

According to a first aspect of the present invention, a strip-shaped body formed by forming a convex portion having a concave inner surface and a raised surface in the longitudinal direction is spirally wound to form a wound tube body. on the other hand,
The feature is that the top of the convex portion is cut to form an absorption hole. According to a second aspect of the present invention, on one side of the band-shaped body, there is formed a mouthpiece that is composed of an opening that opens to the edge side and a flat space following the opening, and the other side of the band-shaped body does not come out of the opening. It is characterized in that an inner piece is formed between the mouthpiece and the hook head, and a convex portion is formed on the inner piece while forming a hook head having a shape. A third aspect of the invention is characterized in that a convex portion having a concave inner surface and a raised surface is formed on the tube body, and the top of the convex portion is cut by a cutter to form an absorption hole. As a means for cutting the convex portion, an end mill or the like may be used as well as a hook-shaped cutter.

[0005]

In the first aspect of the present invention, the convex portion is continuously formed in a spiral shape on the wound tube body. Therefore, if the top of the convex portion is cut with a cutter or the like, the absorption hole is automatically formed. . In particular,
When the cutter is moved along the longitudinal direction of the wound tube body, the absorption holes are continuously formed in the moving direction. In the second aspect of the invention, the wound tube body can be freely bent within a range in which the hook head can move within the beak. Moreover, even if the strips of the same size are used, the pipe diameter can be freely adjusted by the winding method. In the third invention, the absorption hole can be formed only by cutting the convex portion.

[0006]

1 shows a first embodiment shown in FIGS. 1 to 6, in which the winding tube main body m shown in FIG. 1 is obtained by spirally winding a strip-shaped body a. As shown in FIG. 2, an arbor beak 1 is formed on one side that is continuous in the longitudinal direction.
This jaw beak 1 has an opening 2 formed on the edge side thereof and a space 3 following it. A hook head 4 is formed on the other side of the strip a, and an inner piece 5 is connected to the hook head 4. A convex portion 6 is integrally formed between the inner piece 5 and the jaw beak 1. The convex portion 6 thus configured has a concave portion 6a formed on the inner surface thereof so that the surface is raised. Further, the jaw beak 1 allows the hook head 4 to enter the space 3 thereof, and maintains the dimension such that the head 4 does not come off from the opening 2.

In order to form the band-shaped body a as described above into the winding tube main body m shown in FIG. 1, the hooking head 4 is spirally wound while fitting the hooking head 4 into the mouthpiece 1 (FIGS. 1 and 3).
reference). Next, as shown in FIG. 4A, the wound tube body a
The hook-shaped cutter 8 is moved in the direction of the arrow 7, which is the longitudinal direction of, to cut the top of the convex portion 6 to form the absorption hole 9. When the top of the convex portion 6 is cut by the cutter 8 in this way,
The absorption hole 9 is formed as shown in (b).
Are arranged on the locus of the cutter 8 as shown in FIG. Further, the convex portion 6 appears in a spiral shape on the surface of the wound tube body a. And
If the cutter 11 is continuously moved in the longitudinal direction of the winding tube body a as described above, a large number of absorption holes 9 can be continuously formed in the convex portion 6. The cutter is not limited to the hook-shaped cutter shown in FIG. 4, but may be, for example, an end mill.

When the hook head 1 is fitted in the mouthpiece 2 and wound spirally to form a wound tube body a having a convex portion 6 on the outer wall, the wound tube body a becomes expandable and contractible. It can be bent without using a joint. And it is easy to change the pipe diameter and length. In other words, when manufacturing large diameter pipes and long pipes,
No large-scale device is required. In addition, when the convex portion 6 has an inclination as shown in FIG. 6, depending on the blade width of the cutter that cuts off the head of the convex portion 6 and the cutting depth,
The size of the absorption holes 9 can be changed. For example,
When the cutting position is H1, the absorption hole 9 smaller than H2 is opened. Further, as the material of the underdrain pipe of the present invention, it is convenient to use synthetic resin instead of porcelain or cement in order to easily cut off the convex portion 6. The synthetic resin is lighter and cheaper, and has higher durability. However, as long as the convex portion 6 can be cut, the material thereof does not matter.

In the second embodiment shown in FIG. 7, a cylindrical main body m which is not a wound tube is provided with a convex portion 6 continuous in the axial direction thereof. And in the case of this second embodiment,
If the cutter 8 is moved in a direction orthogonal to the convex portion 6, the first
The absorption holes 9 similar to those in the embodiment can be formed. In the third embodiment shown in FIG. 8, a large number of convex portions 6 are formed on the cylindrical main body m which is not a wound tube.
Is formed. Also in this third embodiment, the absorption holes 9 are formed by using the cutters 8 as the tops of the protrusions 6.

[0010]

According to the first aspect of the present invention, since the convex portion is continuously formed in a spiral shape on the wound tube body, the peak of the convex portion is
If you cut with a cutter, the absorption holes will be formed automatically. In particular, when the cutter is moved along the longitudinal direction of the wound tube body, the absorption holes are continuously formed in the moving direction. Therefore, the productivity is remarkably improved as compared with the conventional case where each absorption hole is formed by a drill or the like. According to the second aspect of the invention, the wound tube body can be freely bent within the range in which the hook head can move within the beak. Moreover, even if the strips of the same size are used, the pipe diameter can be freely adjusted by the winding method. Therefore, it is possible to freely deal with all the conditions such as the burial place. According to the third aspect, the absorbing hole can be formed in the pipe body only by moving the cutter in a desired direction, and the manufacturing efficiency thereof can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a wound tube body formed by winding a band-shaped body.

FIG. 2 is a perspective view of a band-shaped body.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged cross-sectional view of a convex portion, (a) before cutting and (b) after cutting.

FIG. 5 is a perspective view of a wound tube body having absorption holes formed therein.

FIG. 6 is an enlarged cross-sectional view of a convex portion.

FIG. 7 is a side view of the tube body of the second embodiment.

FIG. 8 is a perspective view of a tube body according to a third embodiment.

FIG. 9 is a perspective view of a conventional underdrain pipe.

10 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 m Winding pipe main body 1 mouthpiece a strip 2 opening 3 space 4 hooking head 5 inner piece 9 hole 6 convex portion 6a concave portion

Claims (3)

[Claims] 1. A strip-shaped body, which is obtained by denting an inner surface and bulging the surface to continue in a longitudinal direction, is spirally wound to form a wound tube main body, while the top of the ridge is cut. An underdrain tube with an absorption hole formed. 2. A strip-shaped beak formed on one side of the band-shaped body and having an opening opening to the edge side thereof and a flat space following the opening, and the other side of the band-shaped body is shaped so as not to slip out from the opening. 2. An inner piece is formed between an arbor and a hook head, and a convex portion is integrally formed between the inner piece and the arbor while forming the hooked head. Underdrain. 3. A method for producing a underdrain pipe, comprising forming a convex portion having a concave inner surface and a raised surface on a tube body, and cutting the top of the convex portion with a cutter to form an absorption hole.