JPS59127719A - Holed pipe with through-hole closed at end and method for closing through-hole of holed pipe - Google Patents

Abstract

PURPOSE:To close through-holes of a synthetic resin holed pipe positively so as to prevent water leakage trouble, by collapsing the through-holes at the end of the holed pipe, and closing the open ends of the through-holes at the collapsed section by a sealing material. CONSTITUTION:An end of the synthetic resin holed pipe 1 having a plurality of the through-holes 14 extending longitudinally between an outer wall layer and an inner wall layer 12 of the pipe wall with a partition wall 13 between the through-holes 14 is heated to be softened. Then with core members 51 of an inner mold 5 diametrically reduced, an enlarged section of the inner mold 5 is inserted into a prescribed position of the end of the pipe 1, then a tapered member 53 is moved in a direction as shown by the arrow to diametrically enlarge the core members 51, and at the same time the outer diameter 4 is reduced, so that projections 41, 511 extrude cooperatively the outer wall layer 11 and the inner wall layer 12 to collapse the through-holes 14. Thereafter the outer mold 4 and the inner mold 5 are removed. Then a cap 2 that is filled with a sealing material 3 and has an outer flange 21 and an inner flange 22 is fitted to the open end part of the pipe so that the sealing material 3 is allowed to enter the open ends of the through-holes 14 to close them.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube (hereinafter referred to as a "hole tube") having a large number of through holes communicating in the tube axis direction between an outer wall layer and an inner wall layer of the tube wall.

This type of hole tube has a through hole in the tube wall, so it has the advantage of being lighter in weight than conventional tubes, saving material, and increasing rigidity. In recent years, this method has come to be widely adopted as underground sewage pipes.

By the way, the connection between these Hall tubes is similar to the conventional connection between tubes, by providing a socket in one Hall tube and inserting the socket of the other Hall tube into the socket, and connecting them one after another. However, in this case, the inside and outside of the tube communicate with each other through the through hole in the tube wall, causing problems such as the fluid inside the tube flowing out through the through hole.

In order to solve this problem, a method has been used to close the through hole by crushing the end of the hole tube.However, in the conventional closing method, the end of the hole tube is heated and softened, then the outer and inner molds are inserted into the tube end. Because the pipe was simply crushed by pressing the pipe, the hole was not completely blocked, and when the pipe was subjected to vibration or shock, or was deformed into a flat shape under load, it would be crushed. There was a drawback that the closed part opened.

The present invention solves these conventional drawbacks and provides a hole pipe and a method for using the hole in which the hole can be reliably blocked.

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

Fig. 1 is a partial front view showing the end surface of a Hall pipe; FIG. 2 is a cross-sectional view of a main part showing a hole closing process, in which the symbol / is a hole tube, 2 is a cap, 3 is a sealing hole, G is an outer mold, and Y is an inner mold.

The hole tube / has an outer wall layer // and an inner wall layer /-2 as a partition wall /3
It is a synthetic resin tube which has a structure in which the pipes are joined together, and has a large number of through holes in the tube wall that communicate in the tube axis direction.

This hole tube is usually obtained by extrusion molding, and its cross-sectional shape may be a perfect circle, an ellipse, or any other appropriate shape. However, there is no particular limitation on the cross-sectional shape of the through hole/4'.

The present invention crushes each through hole/g by pressing the outer wall layer//or inner wall layer 7) of the hole tube/end, and also fits the cap hole to the tube end to close the gap 2. A sealing material 3 is interposed between the tube end and the opening end of the crushed through hole/≠ is completely sealed and closed by this sealing material 3.

This specific example will be explained in detail with reference to FIG.

Figure 1 (a) shows an embodiment applied to one end of a straight pipe, in which the outer wall layer // is suppressed and the inner wall layer //! Place the material in close contact with the material 3 and cap it! After filling the inside of the tube, the outer surface of the tube end and the outer periphery of the tube end can be easily sloped. Therefore, it is suitable for use as a socket to be inserted and connected to the sockets shown in FIGS. 2(B) and 2(C).

(B) The figure shows an embodiment applied to a sleeve socket, including the outer wall layer // and the inner wall layer //! of the tube end. The cap is fitted by pressing. In this case, the outer and inner surfaces of the cap can be made flush with the outer and inner surfaces of the tube, resulting in a good appearance.

(Figure 9 shows an example of application to a so-called rubber ring socket, in which the outer wall layer // of the pipe end is pressed to crush the through hole /4', and the rear thereof is pressed. Squeeze this concave part/
Camp λ was closed in the evening. In addition, the recess/
j may be obtained by partially crushing the outer wall layer // or by crushing the entire circumference of the outer surface of the tube. In this example, the cap! Since it engages with the recess /j and reliably prevents separation from the tube end, it is not necessary to have a structure that fits into the inner surface of the tube end.

As explained in the above specific example, the present invention has a through hole/4I-
After crushing, the open end of the crushed through hole /Il- is closed with a sealing material 3, and the sealing material 3 of the trench is fitted to the end of the tube! Since the sealing material 3 is protected by the sealing material 3, even if the internal pressure of the pipe acts on the sealing material 3 through the through hole, the sealing material 3 will not come off, thereby reliably preventing water leakage from occurring.

Incidentally, examples of the sealing material used in the present invention include silicone, modified silicone, and hot melt type adhesives, but any material can be used as long as it can achieve the above-mentioned effects. good. In addition, the cap that fits onto the end of the hole tube to protect the sealing material is
It is preferable to use synthetic resin, which is the same material as the hole tube, but if necessary, it may be made of fiber-reinforced plastic.

Next, the closure method of the present invention will be explained based on FIG. 3 and FIG. It should be noted that although the description below will be given as an example in which the present invention is applied to a rubber ring receptacle, the closing method of the present invention is not limited to this example.

In the process diagram shown in FIG. 3, first, the end of the hole tube that will become the socket is heated and softened over a certain length.

Next, an inner mold is press-fitted into this tube end, and the diameter of the tube end is expanded to form a socket. At this time, the inner mold j press-fits the enlarged part j at a predetermined position 1 while keeping the core member j divided into a plurality of pieces reduced in diameter, and then moves the tapered member 3 in the direction of the arrow in the figure. It is preferable to increase the diameter of the core portion by increasing the diameter of the core portion.

Then, simultaneously with the diameter expansion operation of the core member j/, the diameter of the outer mold is reduced and pressed against the outer surface of the end of the hole pipe. When the diameter of the core member O/ is expanded and the diameter of the outer mold is reduced, a socket is formed, and at the same time, the through hole at the end of the socket is formed. is crushed.

That is, the protrusion t/ provided on the inner surface of the outer mold g presses the outer wall layer //, and the protrusion j// provided on the outer surface of the core member j/ does not press the inner wall layer 1/2. 4' is crushed by both wall layers.

After the socket is formed at the end of the hole pipe through the above steps, the outer mold t1 and the inner mold j are removed, and a cap is fitted to the socket end. The second figure shows the fitting process with the cap, which has an outer flange, 2/ and an inner flange 22 that fit into the outer and inner surfaces of the socket end! Using this cap-
〇After filling the inner part with sealing material 3, fit it into the socket end. At this time, if adhesive is applied to the outer and inner surfaces of the socket end, the fitting with the cap 2 will be further strengthened, which is preferable. In addition, in the fitting process shown in Figure 1, if the pressed socket end is longer than necessary, it is advisable to cut off the unnecessary portion C before fitting the camp. When the socket end is inserted all the way into the cap 2, the cap is ready! The sealing material 3 that had been filled in the deep part of the hole penetrated into the open end of the pressed through hole/≠. As shown in FIG. 2(b), the through hole is completely closed.

As detailed above, the present invention involves crushing the through hole at the end of the tube, then closing the open end of the crushed through hole with a sealing material, and fitting the sealing material to the end of the tube. Since it is protected by a cap, the hole is definitely blocked and there is no risk of water leakage.

[Brief explanation of drawings]

Fig. 1 is a partial front view showing the end surface of a hole pipe, Fig. 2 is a sectional view of the main parts of various hole pipes in which the through hole at the pipe end is closed,
FIGS. 3 and 3 are sectional views of essential parts showing the process of closing the through hole. /-...Hall pipe, //...Outer wall layer/u
,・Inner wall layer, /4'-...Through hole,!
--Cap, 3... Seal material...
External type, Evening... Internal type horse 1 Figure no, Figure 3 Figure 4

Claims (1)

[Scope of Claims] /) A hole tube made of gold and resin and having a large number of through holes communicating in the tube axis direction between an outer wall layer and an inner wall layer of the tube wall, the outer wall of the end of the hole tube Each through hole is crushed by pressing the layer or inner wall layer, and the through hole is crushed by a sealing material that is still fitted with a camp at the end of the pipe and interposed between the camp and the end of the pipe. A hole tube in which the opening end of the tube is closed, and the tube has a large number of holes communicating in the axial direction between the outer wall layer and the inner wall layer of the tube wall. A hole tube made of synthetic resin, the end of the hole tube is heated and softened, and an outer mold and an inner mold are pressed against the outer surface and inner surface of the tube end to press the outer wall layer or the inner wall layer to form each through hole. is crushed, and then a cap is fitted to the end of the tube, and the open end of each crushed through hole is closed with a sealing material interposed between the cap and the end of the tube. Hole duct closure method.