JPH029234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for closing a hole in a synthetic resin tubular body (hereinafter referred to as a hole tube) having a hole in the tube wall in the tube axis direction.

[Conventional technology]

This kind of Hall tube is as illustrated in FIG. 1, and the Hall tube 1 has an inner wall 1a and an outer wall 1b which are connected by a rib body 1c, and there is a passage between them in the tube axis direction. Since the hole 1d is provided, if these holes are left open at both ends, if this hole pipe is connected and buried underground to flow water, groundwater etc. outside the pipe will pass through the hole in the pipe wall. Since there is a risk that water flowing into the pipe or water passing through the pipe leaking out of the pipe, it is necessary to prevent this, and various measures have been taken in the past for this purpose.

For example, a method has been disclosed in which a connecting partition (rib body) connecting the inner and outer walls is cut at the end surface of a hole tube, and then both or one of the inner and outer walls is pressed against the other to close the through hole. .

[Problem to be solved by the invention]

In this method, the outer wall and the inner wall are fused together after the joint partition is cut with a cutting tool as described above, so it is necessary to cut a sufficient length at the end of the partition so as not to interfere with the fusion. Furthermore, when the inner and outer walls of the end portion are pressed from the outside to fuse together, if the pressing force is not uniform, there will be areas where the welding fails, which is inconvenient. Further, when an impact is applied to the end of the hole tube, the fused portion may peel off or be damaged.

[Means to solve the problem]

The present invention has been made in order to solve the above-mentioned problems. An annular heating element is pressed and heated between the inner and outer walls of the end face of the hole tube, and the end of the rib body connecting the inner and outer walls is heated by the annular heating element. It is characterized in that it is melted to form a circumferentially continuous annular groove on the tube end surface, the ends of each through hole are closed by the melt, and a tube end forming tool is fitted into the annular groove. .

[Effect]

With the above structure, the through hole opened in the end face of the hole tube is closed by the melt and the tube end former, and the tube end former protects the end of the hole tube.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The end of the Hall tube 1 shown in FIG. 1 is processed using a closing heater 2 as shown in FIG. This closing heater 2 consists of a container body 2a, an annular groove 2b into which the end 1e of the hole tube 1 is inserted from the front side, and a support member fitted so as to reach the annular groove 2b from the back side. 2c, and an annular heating body 2d that protrudes from the front surface of the support body 2c and is located concentrically within the annular groove Zb, and its heating means include heating by embedding a heater or the like, or by heating separately. It is possible to heat at least the heating body 2d to a required temperature.

When the closing heater 2 is heated and the end 1e of the hole tube 1 is inserted into the annular groove 2b as shown in FIG. 3, the heating body 2d enters from the end surface of the hole tube while melting the rib body 1c. Therefore, a groove 1f having the same shape as the heating body 2d is formed in the end of the hole tube in an annular shape, and the melted material of the rib body 1c becomes a burr and seals each through hole 1d. The purpose of the blockage is thus achieved.

After closing the through hole 1d in this way, the hole tube 1 and the closing heater 2 are separated, and a tube end forming tool 3 made of synthetic resin, metal, etc. is attached to the tip of the hole tube 1 as shown in FIG. Install. The tube end forming tool 3 has an annular shape and has a protrusion 3a at the base end that fits into the annular groove 1f at the end of the hole tube, and slopes 3b and 3c on the inner and outer peripheries of the tip. When it is applied and fitted into the annular groove 1f, it is closely fixed to the end surface of the hole tube. The through hole 1d is completely closed by the tube end forming tool 3. Further, the slope 3c on the outer periphery of the tube end serves as a guide, making it easy to insert and connect this hole tube to the other socket.

〔Effect of the invention〕

As described above, the present invention forms a continuous annular groove in the circumferential direction on the end surface of a hole tube using an annular heating body, uniformly closes each through hole end with a melt, and has a tube end forming tool in the annular groove. Therefore, the large number of through holes opened in the annular groove can be easily and reliably completely closed regardless of the cross-sectional shape of the through holes and the spacing between the through holes. In addition, the tube end forming tool that fits into the annular groove allows underground water to flow through the hole without opening the blocked hole or damaging the tube end even if an impact is applied to the tube end. There is no risk of infiltration of fluid into the pipe or leakage of fluid into the pipe.

[Brief explanation of drawings]

Fig. 1 is a cutaway perspective view of a Hall pipe, and Figs. 2 to 4 show an embodiment of the method for closing a hole in a Hall pipe according to the present invention. A vertical cross-sectional view showing an example of a corresponding occlusion heater,
FIG. 3 is a longitudinal sectional view of the hole tube end processed by the heater, and FIG. 4 is a longitudinal sectional view showing a tube end forming tool attached to the tip of the hole tube whose through hole has been closed by the above processing. DESCRIPTION OF SYMBOLS 1... Hall pipe, 1a... Inner wall, 1b... Outer wall, 1c... Rib body, 1d... Through hole, 1e... Tube end, 1f... Annular groove, 2... Closure heater, 2
a... Container body, 2b... Annular groove, 2... Annular heating body, 3... Tube end forming tool.

Claims (1)

[Claims] 1 An annular heating body is pressed and heated between the inner and outer walls of the end face of the hole tube, and the end of the rib body connecting the inner and outer walls of the tube is melted by the annular heating body to form a continuous annular groove in the circumferential direction on the end face of the tube. A method for closing a through hole in a hole tube, comprising the steps of: closing each through hole end with the melt, and further fitting a tube end forming tool into the annular groove.