JPH0572241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a hume tube having an enlarged-diameter socket at one end, and lining the inner circumferential surface of the tube with a covering member. The present invention relates to a method of manufacturing a hume tube in which a lining is formed by integrally bonding the sheathing member used as an inner mold when manufacturing the tube to the inner peripheral surface of the tube.

(Prior Art and its Problems) Hitherto, hume pipes have been used as underground sewage pipes. In general, hume pipes have the advantage of being excellent in rigidity and pressure resistance, but have the disadvantages of poor watertightness and being easily corroded by chemicals and the like.

For this reason, especially when watertightness, corrosion resistance, etc. are required, the inner circumferential surface of the hume tube has been covered with a synthetic resin pipe such as vinyl chloride resin, which has excellent watertightness, corrosion resistance, etc.

However, in the past, the fume tube and the synthetic resin tube were manufactured separately, and then the synthetic resin tube was inserted into the fume tube and lined. This resulted in poor adhesion between the hume tube and the synthetic resin tube, especially when handling high-temperature fluids. Synthetic resin pipes sometimes peeled off from the lining of the pipes used to transport the products.

In addition, when lining the inner peripheral surface of a Huum tube with an enlarged-diameter socket at one end with a synthetic resin tube, the synthetic resin tube inserted into the Huum tube was thermally expanded and brought into close contact with the inner peripheral surface of the socket. Because there is a step between the back of the socket and the straight pipe, simply thermally expanding the synthetic resin pipe will not allow the synthetic resin pipe to come into close contact with the corner where the inner peripheral surface of the socket intersects with the step. It was difficult.

Therefore, after thermally expanding the synthetic resin pipe, an inner mold was press-fitted into the socket and crimped onto the stepped part.However, this press-fitting of the inner mold was not only time-consuming, but also the inner diameter of the socket If there were variations in the internal mold, the hume tube could be damaged by press-fitting the inner mold.

(Means for Solving the Problems) The present invention uses a covering member as an inner mold when manufacturing a hume tube having an enlarged diameter socket at one end,
A feature of the present invention is that the covering member is fixed to the inner circumferential surface of the hume tube to integrally connect the hume tube and the covering member.

The covering members include a covering member 1 that covers the inner circumferential surface of the socket of the humid pipe, a covering member 2 that covers the stepped part at the back of the socket, and a covering member 3 that covers the inner circumferential surface of the straight pipe part. Prepare. Next, these covering members 1, 2, and 3 are connected, and the outer peripheral sides of these covering members 1, 2, and 3 are covered with an outer mold 5 to form a cavity a, and cement milk or the like is filled in the cavity a. After solidifying, remove the outer mold 5,
The covering members 1, 2, and 3 are fixed to the inner peripheral surface of the tube, and the hume tube is removed. In this way, a lining hume tube in which the hume tube and the covering member are integrally connected is obtained.

Hereinafter, the specific configuration of the present invention will be explained based on examples.
This will be explained in detail with reference to the drawings.

(Example) Fig. 1 is a longitudinal cross-sectional view of a manufacturing process showing an example of the present invention, Fig. 2 is a longitudinal cross-sectional view of a lining fume pipe obtained according to the present invention, and Fig. 3 is a longitudinal cross-sectional view of a lining fume pipe obtained by the present invention. FIG. 4 is a sectional view taken along the line ``--'' in the figure, and FIG.

Reference numerals 1, 2, and 3 in the figure are all covering members that cover the inner circumferential surface of the hume tube, and 1 is a covering member that covers the inner circumferential surface of the socket, and 2 is a covering member that covers the step at the back of the socket. The covering member 3 is a covering member that covers the straight pipe portion. 4 is a covering member that covers the spout end and the outer peripheral surface of the straight pipe section, and these covering members 1, 2, 3, and 4 are made of thermoplastic resin such as vinyl chloride resin, polyethylene resin, polypropylene resin, Alternatively, it is made of a thermosetting resin such as a polyester resin or an epoxy resin, or a fiber-reinforced plastic made by impregnating glass fiber or the like with the thermosetting resin.

5 is an outer mold, 6 is a fixed mold that supports the covering member 1 from the inside, and 7 is a fixed mold that supports the end of the covering member 3 from the inside.

The covering member 1 has a locking protrusion 11 protruding from the outer peripheral surface of a short tube, and one end of the covering member 1 widens in a tapered shape. 1 and 2 show an example in which an annular groove is provided on the inner circumferential surface of the covering member 1, but this annular groove can be used to connect tubes with each other in a flexible manner by attaching a rubber packing. This annular groove is not necessary when the tubes are bonded together. Further, the covering member 1 may be formed into a tubular shape by combining a plurality of circular arc members.

Further, the covering member 2 has a donut disk shape, and a locking projection 21 is provided on the back surface thereof. The covering member 1 is provided on the outer circumferential side of the covering member 2.
A fitting recess 22 for inserting the end of the covering member 3 is provided, and a fitting recess 23 for inserting one end of the covering member 3 is provided on the inner peripheral side.

Generally, the covering member 2 is integrally molded by injection molding or the like, but it may also be formed by combining divided members into a donut shape as shown in FIG. In this case, as shown in FIG. 4, a fitting recess 424 is provided at the end of each divided member.
It is preferable to provide a convex portion 25 and a convex portion 25 for fitting connection.

On the other hand, the covering member 3 has a large number of locking protrusions 31 provided at appropriate intervals on the outer circumferential surface of a long tube, but even if it is formed into a tubular shape by joining a plurality of arcuate members. good.

In the present invention, after the aforementioned covering members 1, 2, and 3 are connected, a covering member 4 having a U-shaped cross section is connected to the outer periphery of the end portion of the covering member 3. Next, as shown in FIG. 1, fixed molds 6 and 7 are inserted and supported in the covering members 1 and 3, and a divisible outer mold 5 is set on the outer periphery of these covering members to form a cavity a. ,
Fill the cavity a with cement milk or the like. Then, after the cement milk etc. have solidified, the outer mold a and the fixed molds 6 and 7 are removed.

Thus, the covering member 1 used as the inner mold,
A Hume tube A is obtained in which the tubes 2 and 3 are fixed to the inner circumferential surface of the tube. This lining fume pipe has locking protrusions 11, 21, 31 protruding from the outer circumferential surface or back surface of the covering members 1, 2, 3, which are embedded in the wall of the fume pipe and are integrally connected to each other. There's nothing to do.

(Operations and Effects of the Invention) As described in detail above, the present invention prepares a covering member for covering the inner circumferential surface of a hume pipe, connects these covering members to form an inner mold, and forms the outer circumferential side of the covering member. After a cavity is formed by covering it with an outer mold, the cavity is filled with cement milk or the like, and then the outer mold is removed.

Therefore, the lined fume pipe obtained by this manufacturing method can be used as a high-temperature fluid transport pipe because the covering member used as the inner mold is integrally bonded to the inner peripheral surface of the fume pipe. It will not peel off even when used.

In addition, according to the manufacturing method of the present invention, complicated work steps such as heating and expanding the synthetic resin tube and press-fitting the inner mold, which were adopted in the conventional manufacturing method, are no longer necessary, so the manufacturing equipment becomes simple and inexpensive. A lined hume tube can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a manufacturing process showing an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a lining pipe obtained by the present invention, and FIG. 3 is a line taken along the line shown in FIG. 2. FIG. 4 is a sectional view of a main part showing an example of a connection structure of a covering member. 1, 2, 3, 4... Covering member, 5... Outer mold, 6, 7
...fixed type, a...cavity, A...huum's tube.

Claims (1)

[Claims] 1. When manufacturing a fume tube that has an enlarged diameter socket at one end and whose inner circumferential surface is lined with a covering member, a covering member 1 that covers the inner circumferential surface of the enlarged diameter socket and the back of the socket are manufactured. Covering member 2 that covers the step part of the section
and a covering member 3 for covering the inner circumferential surface of the straight pipe part, and connecting these covering members 1, 2, and 3, and covering the outer circumferential side of these covering members with an outer mold 5 to form a cavity a. Then, after filling the cavity a with cement milk or the like and solidifying it, the outer mold 5 is removed to form a fume tube in which the covering members 1, 2, and 3 are integrally fixed to the inner peripheral surface of the tube. A method for manufacturing a lined humid pipe, characterized in that it is removed.