JPH0365250B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a synthetic resin hole tube (hereinafter simply referred to as a "hole tube") having a large number of through holes in the tube wall in the tube axis direction.
This relates to the hole closure method.

(Prior art and its problems) This type of hole pipe has excellent rigidity, so it is buried underground and used as a sewer pipe. By the way, the connection between these hole tubes is similar to the connection of conventional tubes that do not have through holes in the tube wall.
A method has been adopted in which one end of the hole tube is enlarged in diameter to provide a socket, and the spigot of the other hole tube is inserted into the socket to sequentially connect the holes.

However, in the case of a hole pipe, the fluid inside the pipe may leak through the through hole that communicates in the pipe axis direction.
Conversely, a problem arises in which rainwater, groundwater, etc. flow into the pipe.

Therefore, in order to solve this problem, conventional closing methods have been proposed, such as (a) filling the hole with a sealant, and (b) closing the hole by crushing the pipe wall. In both cases, there were problems in terms of reliability and durability.

In other words, in the former case (a), when each hole is filled with sealant, the amount of sealant is not constant, and the sealant flows to the back of the hole, making it difficult to fill the holes. There were times when it was not possible to securely close the valve. Also, the latter
In the case of (b), simply crushing the pipe wall does not completely close the through hole, and when vibrations, shocks, etc. act on the pipe, a gap may be created at the crushed contact surface. Ta.

The present invention solves the problems of the conventional closing method, and provides a hole closing method that can reliably close the hole and has excellent durability.

(Means for Solving the Problems) The present invention provides a method for closing holes in a synthetic resin hole tube, which has a large number of holes communicating in the tube axis direction in a tube wall in which an outer wall and an inner wall are joined by a partition wall. First, the end of the Hall tube is heated and softened over a predetermined length. Therefore, the tube end is press-fitted between the inner mold and the outer mold to expand its diameter, and then the tube tip is self-contracted and the diameter-reduced tube tip is attached to the inner surface of the outer mold. Insert it into the reinforced ring. Next, the tube tip is expanded in diameter with the core member, and the reinforcing ring is buried in the outer wall of the tube tip to crush the through hole, and a sealing material previously applied to the inner wall surface of the through hole is applied. This feature is characterized in that the contact surfaces between the outer wall and the inner wall are sealed.

(Function) When the diameter of the tip of the hole tube is expanded and the reinforcing ring is buried in its outer wall, the through hole is crushed and the sealing material applied to the inner wall of the through hole is inserted into the outer wall. The contact surface with the inner wall is sealed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Fig. 1 is a partial front view showing the end surface of the hole pipe, and Figs. Inner mold, 4 is outer mold, 4', 41' are metal,
This is a reinforcing ring made of plastic or the like.

The hole tube 1 is made of synthetic resin such as vinyl chloride resin or polyethylene resin, and has a large number of through holes 13 that communicate in the tube axis direction in the tube wall in which the inner wall 11 and the outer wall 12 are joined by a partition wall 14. It is being
Note that the hole tube 1 may have a perfect circular or oval cross-sectional shape, and the through hole 13 is not limited to the shape illustrated in FIG. 1, but may have any other appropriate shape such as a perfect circle or an ellipse. be able to.

In the present invention, first, the sealing material 2 is injected into a through hole opened in the end face of the Hall tube 1 using an appropriate device, and the sealing material 2 is coated on the inner wall surface of the through hole 13 at the tip of the tube. Incidentally, as the sealing material, for example, silicone resin, modified silicone, or hot melt type adhesive can be used.

Therefore, the tube end of the hole tube 1 is heated and softened over a predetermined length, and the tube end is press-fitted between the inner mold 3 and the outer mold 4 to expand its diameter. During this molding process,
The core member 31 has a reduced diameter and is inserted into the main body of the inner mold 3, and a reinforcing ring 4 is provided on the inner surface of the outer mold 4.
1' is installed. For this reason, as shown in FIG. 2A, when the tip of the hole tube 1 with its expanded diameter passes over the main body of the inner mold 3 and passes around the outer circumference of the core member 31, it self-contracts, and its outer diameter Dimensions are reduced. Therefore, when the Hall tube 1 is pushed further to the back, the diameter-reduced tip portion of the tube is inserted through the reinforcing ring 41'.

Next, the core member 31 is expanded in diameter by moving the taper member 32 in the axial direction. Then, as shown in FIG. 2B, the diameter of the tip of the Hall tube 1 expands.
A reinforcing ring 4' is buried in the outer wall 12, and the through hole 1
3 is crushed. Then, the contact surfaces between the inner wall 11 and the outer wall 12 are sealed via the sealing material 2 that has been applied to the inner wall surface of the through hole 13 in advance.

Finally, after reducing the diameter of the core member 31, the inner mold 3
is pulled out from the tube end of the Hall tube 1, and the outer mold 4 is pulled out.
When the mold is opened, the reinforcing ring 4' is buried in the outer wall 12 of the tube tip having the enlarged diameter socket, and a hole tube with the through hole 13 completely closed is obtained.

(Effects of the Invention) As described in detail above, the closing method of the present invention is to bury the reinforcing ring in the outer wall of the hole tube to close the hole, and to apply a sealing material previously applied to the inner wall surface of the hole tube. Since the contact surfaces of the outer wall and the inner wall are sealed through the seal, the through hole is reliably closed. In addition, since the tip of the tube is reinforced with a reinforcing ring, even if vibrations, shocks, etc. are applied to the tube, the contact surfaces between the outer wall and the inner wall will not separate and a gap will not occur.

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
Figure 1 is a partial front view showing the end face of the Hall tube;
Figures A and B are sectional views of main parts showing the process of closing the through hole. DESCRIPTION OF SYMBOLS 1... Hall pipe, 11... Inner wall, 12... Outer wall, 13... Through hole, 14... Partition wall, 2... Seal material, 3... Inner mold, 31... Core member, 4... Outer mold , 4', 41'... Reinforcement ring.

Claims (1)

[Claims] 1. When closing the holes of a synthetic resin hole tube that has a large number of holes communicating in the tube axis direction in the tube wall where the outer wall and the inner wall are joined by a partition, first, the end of the tube is closed over a predetermined length. The tube end is heated and softened, and the tube end is press-fitted between the inner mold and the outer mold to expand its diameter, and then the tube tip is self-shrinked and the diameter-reduced tube tip is attached to the inner surface of the outer mold. Insert the reinforcing ring into the
Next, the tube tip is expanded in diameter with the core member, the reinforcing ring is buried in the outer wall of the tube tip, the through hole is crushed, and a sealing material previously applied to the inner wall surface of the through hole is applied. A method for closing holes in hole pipes, which is characterized by sealing the contact surfaces between the outer and inner walls.