JPH0341716B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a composite joint pipe in which the outer peripheral surface of an inner pipe made of synthetic resin, metal, etc. is coated with a fire-resistant inorganic material.

As is well known, in high-rise buildings, composite pipes are used for water supply and drainage pipes, air conditioning pipes, electrical pipes, and various other pipes in order to improve disaster prevention effects. This composite pipe consists of an inner pipe made of hard vinyl chloride, other synthetic resin, or metal whose outer periphery is coated with a fire-resistant inorganic material.The fire-resistant inorganic material is generally a hydraulic material such as Portland cement, and various reinforcements are used. Mixed materials, aggregates, etc. are often used.

When piping this composite pipe, it is necessary to use a joint pipe in an L-shape, T-shape, Y-shape, or other shape, and if this joint pipe is also made into a composite pipe in the same way as above, the disaster prevention effect will be significantly reduced. Decrease.

When manufacturing a joint pipe made of a composite pipe, an upper split mold and a lower split mold each having a half-recess located on the outer peripheral surface of the supported joint pipe are used, and when the two split molds are assembled, the recess is removed. Attach the inner tube of the joint tube with its open end surface in close contact with the inner surface of the split mold, and support the open end of the inner tube from the outside of the split mold.After combining and crimping both split molds, open the inlet from the injection port of one of the split molds. Generally, a refractory inorganic material mixed with water is press-fitted and filled, and when the inorganic material has reacted to a certain stage, the mold is removed.

Although this manufacturing method has high product precision and good productivity, it has the following drawbacks.

In other words, the press-fitted inorganic material may reach and adhere to the open end surface of the inner tube, or in extreme cases, it may reach and adhere to the open end surface of the inner tube, which not only spoils the appearance but also prevents straight pipes from being inserted and connected. This poses a significant hindrance during piping construction. Cutting and polishing the edge of the outer coating layer until it is flush with the opening end surface of the inner tube and removing deposits from the inner surface of the inner tube is extremely troublesome work, which reduces the effectiveness of the above manufacturing method by half. I will do it. In addition, as mentioned above, the above-mentioned drawbacks can be solved by closely contacting the opening end surface of the inner pipe of the joint pipe with the inner surface of the recess of the formwork, but the manufacturing method of the joint pipe itself, which is the inner pipe, must allow for a certain range of variation. Unavoidably, when heat curing is performed to promote the hydration reaction of inorganic materials, there is a difference in thermal expansion coefficient due to the difference in the materials of the formwork and the joint pipe. It is extremely difficult to manage the devices by keeping them in close contact with each other at all times.

The present invention has been proposed in view of the above, and allows for dimensional differences between the joint pipe and the formwork, eliminates the need to manage the close contact of the opening end face of the inner pipe to the formwork, and allows the opening end face of the inner pipe to be covered with a coating layer on the outer periphery. The present invention relates to an apparatus for manufacturing a joint pipe for a composite pipe, which makes the pipe coplanar with the end face of the inner pipe and reliably prevents inorganic material from penetrating and adhering to the open end face and inner surface of the inner pipe.

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a composite joint pipe 1 manufactured by the apparatus of the present invention, which is shown as a 90° elbow joint pipe. This joint pipe 1 has enlarged diameter parts 3, 3 at both ends of an inner pipe 2 made of synthetic resin, metal, etc.
The outer circumferential surface of the inner tube 2 is provided with the coating layer 4 made of the above-mentioned fire-resistant inorganic material, and the enlarged diameter coating layer 5 is also provided on the outer circumferential surface of the enlarged diameter portion 3, so that each of the enlarged diameter portions 3 is This is the female part for connecting to pipes, etc.

FIG. 2 shows an apparatus of the present invention for manufacturing the above-mentioned composite joint pipe 1, in which metal, synthetic resin,
Although it has a lower mold 11 and an upper mold 12 made of ceramics or the like, any structure of the mold may be used as long as it can be divided into a plurality of pieces.

The lower mold 11 and the upper mold 12 described above are formed with recesses 13 and 14 that are L-shaped and have a semicircular cross section.
1 and the upper mold 12, the hollow parts 13 and 14 form an L-shaped cavity with a circular cross section.
The diameter of this cavity is larger than that of the inner tube 2 by the thickness of the coating layer 4. The both ends of the inner tube are provided with enlarged diameter depressions 15 for the enlarged diameter coating layer 5, corresponding to the both ends.
form 16. The length of each recess is made slightly longer than the inner tube 2, and that portion is
The recessed portions 17 and 18 are formed to have a smaller diameter.

Then, the outer wall surfaces 19 of the lower mold 11 and the upper mold 12,
Holding parts 21 and 22 are formed in the holding parts 20 so as to face the open ends of the diameter-reduced recesses 17 and 18.

Each holding portion 21, 22 includes a holding piece 21a, 22b extending from the outer wall surface 19 or 20, and a holding piece 21a, 22b extending from the outer wall surface 19 or 20.
Bent pieces 21a, 2 whose diameters are reduced from the tips of a, 22b
2b, with an L-shaped cross section, and a diameter-reduced recess 17,1
A plurality of them are provided outside the opening end of the opening.

The lower mold 11 is formed with an injection hole 23 that communicates from the outside of the lower surface to the inside of the recess 13, and the upper mold 12 is provided with a through hole 24 for exhaust and overflow that communicates from the inside of the recess 14 to the outside of the upper surface. do. The injection port 23 and the through hole 24 described above may be formed at any suitable position other than the above.

The manufacturing apparatus of the present invention includes the above-described lower mold 11 and upper mold 1.
In addition to 2, an inner tube support 25 is used.

This support 25 has a flange 27 at one end of the operator 26.
A fixed part 28 is provided extending from the flange part 27, and a ring-shaped support part 29 is fitted to the operating element 26, and a groove-shaped operating part 3 is provided on the end surface of the operating element 26.
form 0. According to the practical example of the drawing, the support part 29
is screwed onto the operating element 26, and when the supporting part 29 is fixed and the operating element 26 is rotated by the operating part 30, it moves in the axial direction.

In the support 25 described above, the flange portion 27 is similar to the enlarged diameter recessed portions 15 and 16 of the lower mold or upper mold described above.
The fixed part 28 has a circular or polygonal shape that is inscribed in the hollow part with the same diameter, and the fixed part 28 is inscribed in the inner surface of the enlarged diameter part 3 of the inner tube 2, and the supporting part 29 is inscribed in the holding part 21 of the lower mold 11 and the upper mold 12. , 22 and is preferably fitted. In addition, the operator 26, the fixed part 28, and the collar part 2
7 is a connection system that moves only back and forth with the rotation of the operator, rather than being completely integrated, but it is preferable because it does not cause displacement of the inner tube. The lower mold 11 and upper mold 12 mentioned above
In order to manufacture a composite joint pipe using the support tool 25, the support tool 25 is made to face each open end of the inner tube 2 prepared in advance, and the fixing part 28 of each support tool 25 is
is fitted into the enlarged diameter portion 3 of the inner tube 2. In this state, the lower half of the inner tube 2 is stored in the recess 13 of the lower mold 11,
The lower half of the flange 27 is attached to the enlarged diameter recess 15, and the lower half of the support section 29 is fitted into the holding section 21.

Next, after fitting the lower mold 11 and the upper mold 12 or before joining, the operation part 30 of each support 25 is used to
Rotate 6. When the operator 26 is rotated, the support part 2
9 is fitted into the holding part 21 and does not rotate, the operator 26 moves forward and the flange part 27 is attached to the enlarged diameter part 3 of the inner tube 2.
Press it onto the opening end surface.

When each support 25 is operated as described above, the inner tube 2
is held by the fixing part 28 and the collar part 27, and the lower mold 11
The opening end face of the enlarged diameter portion 3 is sealed with the flange portion 27 in a contactless state. In this state, the upper mold 12 is joined to the lower mold 11, or the lower mold 1
1 by joining the upper mold 12 to the upper mold 12 and then operating each support 25, the inner tube 2 is connected to the recess 13 of the lower mold 11 and the upper mold 12.
The inner tube 2 is held concentrically within a cavity formed by the recess 14 of the inner tube 2, and an even space is formed between the inner surface of the cavity and the outer surface of the inner tube 2. Therefore, the injection port 23
A fluid refractory inorganic material may be injected into the space, and when it overflows from the through hole 24, the injection of the inorganic material may be stopped. After the inorganic material has hardened to some extent through curing, it is removed from the mold. As a result, a coating layer 4 made of a fire-resistant inorganic material is formed on the outer circumferential surface of the inner tube 2, and the edge of this coating layer 4 is completely received by the flange 27, so that the inorganic material covers the open end surface of the inner tube and the outer peripheral surface of the inner tube 2. It does not penetrate or adhere to the inner surface.

In the above embodiment, the joint pipe was a 90° elbow, but in the case of a T-shaped pipe or a Y-shaped pipe, depressions corresponding to the pipe were formed in the lower and upper molds, and three similar to the above were formed. You can use supports. If a joint pipe of another shape is to be manufactured, a mold corresponding to the shape and the required number of supports may be used in the same manner. Furthermore, it is preferable to attach a flexible material to the flange 27 so that it closes tightly when the open end surface of the inner tube comes into contact with it.

Furthermore, although the holding portions of each part are shown as having an L-shaped cross section in the embodiment of the drawings, they may have other structures, or the supporting portions may be directly fixed to the outer wall of the mold with screws or the like. Good too.

In short, according to the present invention, since it consists of a mold and a support that faces the open end of the inner tube stored in the mold, the inner tube is always kept in the mold even if there is a slight difference in the length of the inner tube. It can be firmly supported at an appropriate position inside the frame. Since the open end surface of the inner tube is tightly closed by the flange of the support, the refractory inorganic material does not adhere to the open end surface of the inner tube or the inner tube.

Further, since the holding parts are formed on the outer wall surfaces of the upper and lower formworks, the supporting parts of the support tool can be easily attached.

Therefore, not only does the manufactured composite joint pipe have a good appearance, but it also eliminates the need to polish the end of the joint pipe or remove deposits when connecting it to a straight pipe, making piping work highly efficient. Moreover, it can be used with any type of joint pipe.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a composite joint pipe manufactured by the apparatus according to the present invention, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIG. It is a cutaway plan view. 1...Composite joint pipe, 2...Inner pipe, 11...Lower mold, 12...Upper mold, 13, 14...Recessed part, 19,
20... Outer wall surface, 21, 22... Holding part, 25...
... Support, 26 ... Operator, 27 ... Flange, 28
...Fixing part, 29...Supporting part.

Claims (1)

[Claims] 1. A device for manufacturing a composite joint pipe in which the outer circumferential surface of an inner pipe is coated with a fire-resistant inorganic material, which has a recess for housing the inner pipe and a holding part provided on the outer wall surface facing the open end of the recess. It consists of a split mold and a support that is attached to the holding part and holds the open end of the inner tube, and the support includes an operator and a collar that is attached to the operator and comes into close contact with the open end of the inner tube. a fixed part in which the operator further extends from the flange and is fitted into the open end of the inner tube; and a support part that is attached to the holding part of the split mold and can move the operator in the axial direction. The inner tube housed in the recess of the split mold is held by a support, and the flange of the support is brought into close contact with the open end surface of the inner tube, and there is a fireproof structure between the inner surface of the recess and the outer surface of the inner tube. A manufacturing device for a composite joint pipe, characterized in that it is filled with an organic inorganic material for curing.