JP3672898B2 - Equipment for manufacturing refractory clad pipe joints - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an apparatus for coating the outer surface of a synthetic resin pipe joint with a refractory material.
[0002]
[Prior art]
If the drainage pipe is made of synthetic resin pipes in apartment buildings, etc., the pipe will burn in the event of a fire, noise will be generated when drainage flows through the pipe, and the temperature difference between the waste water flowing through the pipe and the temperature In order to cause a problem such as dew condensation on the surface of the pipe line, the drain pipe line is made of a synthetic resin pipe coated with a refractory material. In the piping work in that case, a linear synthetic resin pipe having a refractory material coating is joined by a synthetic resin pipe joint having a refractory material coating.
[0003]
As a device for applying a refractory material coating to a synthetic resin pipe joint, the synthetic resin pipe joint has a cavity whose size is larger than the outer dimension of the refractory material coating layer formed on its outer surface. Cement mortar, which is a raw material for refractory material, is injected into the gap between the cavity inner wall surface and the outer surface of the synthetic resin pipe joint, supported in the mold, and the outer surface of the synthetic resin pipe joint is obtained by solidifying the mortar. There is a device that coats with a cementitious refractory material.
[0004]
[Problems to be solved by the invention]
In the above-described coating apparatus, in order to improve the releasability when the outer surface of the synthetic resin pipe joint is finished with the refractory material in the mold and is removed from the mold, A release agent is applied to the wall surface in advance. However, mortar refractory material to be injected into the cavity, because it contains the same fine mineral particles and polishing sand used for washing dishes in a large amount, the release agent is transported by the flow of mortar, Yellow Extruded from the mold closing surface to the outside together with air in the cavity, etc., so that the release effect cannot be fully exerted, which often breaks the refractory coating layer when removing the product from the mold There was a thing.
[0005]
[Means for Solving the Problems]
Therefore, the present invention aims to improve the releasability when the formed refractory material coating layer is taken out of the mold, and for that purpose, the inner wall surface of the mold cavity is roughened. Features. As a method for roughening the inner wall surface of the cavity, an appropriate method such as polishing with a relatively coarse grindstone or sand blasting is employed.
[0006]
After applying a release agent to the roughened inner wall of the cavity as usual, and then forming a refractory coating layer by injecting refractory mortar, the surface of the roughened glass tableware like ground glass As most of the mold release agent remains in the recesses of the rough surface, even if some of them are lost by the flow of mortar, they remain in the recesses. a manner that the release agent effect can thus be removed from the mold without damaging the refractory coating layer.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be applied to various synthetic resin pipe joints such as straight pipe joints, elbows, cheeses, and merging joints regardless of their forms. The cement material constituting the refractory coating layer is composed of aggregates such as silica sand, calcium carbonate, pearlite, and mineral sand, and fibers such as glass wool, rock wool, mineral wool, and heat-resistant organic wool in a mortar form. It is a mixture with cement, and the types and contents of aggregates and fibers are determined in consideration of fire resistance, sound insulation, heat insulation, and impact resistance, which require a coating layer.
[0008]
From the viewpoint of impact resistance, the refractory material coating layer is preferably in close contact with the surface of the internal pipe joint. However, the refractory coating layer formed of mortar shrinks when curing the solidified mortar, or the resin pipe joint expands when hot or hot water flows through the sewage pipe after the sewage pipe is constructed. These shrinkage and expansion may cause cracks in the refractory coating layer. Therefore, it is desirable to provide a compressible elastic body layer such as sponge or a slight gap between the synthetic resin pipe joint and the refractory coating layer.
[0009]
[Example 1]
In FIG. 6, reference numeral 1 denotes an elbow made of vinyl chloride, which comprises a bent pipe portion 2 bent by 90 ° and slightly large-diameter connecting cylinders 3 and 4 provided at both ends thereof. A thin layer 5 of a compressible elastic body such as sponge rubber, urethane foam, and polystyrene is provided on the outer surface of the elbow 1, and a refractory coating layer 6 is provided on the outer surface of the elbow 1 as shown in FIG. . In use, the vinyl chloride pipes 7 and 8 are inserted into the connecting cylinders 3 and 4, respectively. However, since the vinyl chloride pipes 7 and 8 are covered with the refractory coating layers 9 and 10, respectively, Thus, a fire-resistant drainage pipe can be configured.
[0010]
Next, a manufacturing apparatus for covering the elbow 1 made of vinyl chloride with a cementitious refractory coating layer will be described. As shown in FIG. 6, cored bars 11 and 12 are inserted into the connecting cylinders 3 and 4 of the elbow 1 provided with the compressible elastic body layer 5 as shown in FIG. The metal cores 11 and 12 have the same outer diameter as the vinyl chloride tubes 7 and 8 shown in FIG. 7, and are inserted into the center holes 15 and 16 of the short cylindrical supports 13 and 14, respectively. The supports 13 and 14 have ridges 17 and 18 each having a trapezoidal cross section on the outer peripheral surface.
[0011]
3 and 4 show a pair of molds for forming a refractory coating layer on the outside of the elbow 1 covered with the elastic thin layer 5 shown in FIG. 6, and 21 is a refractory coating. Reference numeral 22 denotes a fixed mold connected to a material mortar injection device (not shown), and reference numeral 22 denotes a movable mold that is closed to the fixed mold 21. The molds 21 and 22 are configured such that the respective closing surfaces 23 and 24 are in close contact with each other. The molds 21 and 22 have cavities 25 and 26 having shapes corresponding to the outer surfaces of the finished elbow refractory coating layer 6 shown in FIG. The shapes are symmetrical to each other.
[0012]
Semi-cylindrical recesses 27 and 28 corresponding to the respective halves of the supports 13 and 14 are provided on the closing surface 23 of the fixed mold 21 so as to be connected to both ends of the cavity 25, and these recesses are respectively supported. It has concave grooves 29 and 30 that are complementary to the ridges 17 and 18 of the tools 13 and 14. In addition, the closing surface 23 of the fixed mold 21 has an injection port 31 connected to the injection device, and a concave groove 32 for guiding the mortar of the refractory coating material to the cavity 25 is provided between the injection port 31 and the cavity 25. It has been.
[0013]
The closing surface 24 of the movable mold 22 is also provided with semi-cylindrical recesses 33 and 34 connected to both ends of the cavity 26, and these recesses are complementary to the ridges 17 and 18 of the supports 13 and 14, respectively. The grooves 35 and 36 have various shapes. Further, a concave groove 37 is formed in the closing surface 24 at a position overlapping the inlet 31 and the concave groove 32 of the mold 21 when the mold 22 is closed with the mold 21.
[0014]
Prior to the work, a release agent is applied to the inner surfaces of the cavities 25 and 26 of the molds 21 and 22. As shown in FIG. 2, the elbow 1 whose surface is covered with the elastic thin layer 5 and the support tools 13 and 14 are attached to both ends is accommodated in the cavity 25 of the fixed mold 21 as shown in FIG. And the movable mold 22 is put on this. At this time, the support tools 13 and 14 are positioned in the recesses 27 and 28 by engaging the ridges 17 and 18 with the concave grooves 29 and 30, and the elbow 1 fitted in the core bars 11 and 12 is moved. Support in the correct position within the cavities 25,26.
[0015]
Next, when a mortar of a refractory material is injected into the cavities 25 and 26 from the injection port 31, the mortar spreads throughout the cavities 25 and 26. At this time, air in the cavity is discharged to the outside as shown from the closure surface 23 and 24 of the mold by the arrows 38, 38 ..., a part of the release agent applied to the cavity inner face along with this is transported to the mortar is discharged to the outside world. However, since the cavity inner face is roughened, the majority of the release agent is residual in the recess of the rough surface.
[0016]
When the injection of the mortar is finished and the molds 21 and 22 are opened after the mortar is solidified, the mold release agent remains uniformly on the inner surfaces of the cavities 25 and 26, and therefore the elbow 1 covered with the refractory material coating layer 6 Can be easily released. The mortar of the refractory material injected into the cavities 25 and 26 contracts during curing, but this contraction is absorbed by the volume reduction of the compressible elastic layer 5, and stress is generated at that time. It is possible to prevent the refractory material coating layer 6 from being cracked. Further, when hot water flows through the elbow 1, the elbow 1 expands, but this expansion is also absorbed by the volume reduction of the compressible elastic body layer 5. It is possible to prevent the layer from cracking.
[0017]
[Example 2]
The elbow 1 made of vinyl chloride not provided with the elastic body layer 5 is heated to, for example, 60 ° C. maintaining a certain degree of mechanical strength, and the core bars 11 and 12 are inserted into the connecting cylinders 3 and 4 respectively. As shown in FIG. 5, the molds 21 and 22 (22 not shown) are loaded. The molds 21 and 22 contain heating wires 40, 40... And are heated to an appropriate temperature, for example, 60 ° C.
[0018]
As in Example 1, mortar of refractory material is injected into the cavities 25 and 26 (26 is not shown) from the injection port 31, and after solidification, the molds 21 and 22 are opened and covered with a refractory material coating layer. The elbow 1 made of vinyl chloride is taken out and cured, but the heated elbow 1 made of vinyl chloride is cooled by natural cooling and contracts due to this, so even if the refractory coating layer contracts due to curing, cracks will occur. It does not occur. Further, even if the elbow 1 is slightly expanded due to hot water flowing in the drain pipe during use, there is no crack in the elbow 1 because there is a slight gap between the elbow 1 and the refractory coating layer.
[0019]
The above is an explanation of an example in which the present invention is applied to an elbow made of vinyl chloride, but the present invention can be similarly applied to cheese and other resin pipe joints.
[0020]
In the above explanation, the material of the coating layer is a cementitious refractory material. However, the cementitious coating layer is not only fireproof but also has a sound insulation property that blocks noise caused by the water flowing through the pipeline, and the temperature inside and outside the pipeline. It is clear that it also has a heat insulating property to prevent condensation due to the difference. And in order to improve especially sound insulation or heat insulation, it is also possible to select the kind and compounding quantity of the aggregate and fiber mixed in raw material mortar.
[0021]
【The invention's effect】
As apparent from the above examples, according to the present invention, a cementitious refractory material coating layer is used on the outer surface of pipe joints made of synthetic resin for the purpose of fire resistance, sound insulation, heat insulation, etc. Can reduce the loss of the mold release material applied to the inner wall of the mold cavity during the injection of cement mortar, and improve the mold release of the plastic fireproof material coating layer .
[Brief description of the drawings]
FIG. 1 is a plan view showing a relationship between a fixed mold and a synthetic resin elbow in an embodiment of a fireproof material-coated synthetic resin elbow manufacturing apparatus embodying the present invention.
2 is a plan view showing a synthetic resin elbow and a support for supporting the elbow in the mold in the embodiment shown in FIG. 1; FIG.
3 is a plan view of a closing surface of a fixed mold in the embodiment shown in FIG. 1. FIG.
4 is a plan view of a closing surface of a movable mold in the embodiment shown in FIG.
FIG. 5 is a plan view showing the relationship between a stationary mold and a synthetic resin elbow in another embodiment of the apparatus for producing a fireproof material-coated synthetic resin elbow embodying the present invention.
6 is a cross-sectional view of a synthetic resin elbow processed in the embodiment shown in FIGS. 1 to 4. FIG.
7 is a cross-sectional view showing a fireproof material-coated synthetic resin elbow manufactured by the embodiment shown in FIGS. 1 to 4 and a pipe line connected to the elbow. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Synthetic resin elbow 2 Curved pipe part 3, 4 Connection pipe | tube 5 Compressible elastic thin layer 6 Refractory material coating layer 7, 8 Vinyl chloride pipe 9, 10 Refractory material coating layer 11, 12 Core metal 13, 14 Support tool 15 , 16 Center hole 17, 18 of trapezoidal trapezoidal ridge 21 Fixed mold 22 Movable mold 23, 24 Mold closing surface 25, 26 Cavity 27, 28 Semi-cylindrical recess 29, 30 Groove 31 Inlet 32 Recess Grooves 33, 34 Semi-cylindrical recesses 35, 36 Concave groove 37 Concave groove 40 Heating wire

Claims (3)

A mold having a cavity larger than the outer dimension of the synthetic resin pipe joint by a predetermined thickness and a supply passage for fluid cementitious uncured refractory material to the cavity, and an inner wall surface in the cavity. And a support for supporting the pipe joint with a gap corresponding to the thickness between them, and the inner wall surface of the cavity is roughened. . The apparatus for manufacturing a refractory material-coated pipe joint according to claim 1, wherein an outer surface of the synthetic resin pipe joint facing the inner wall surface of the cavity is covered with a compressible elastic material. 2. The apparatus for manufacturing a refractory material-coated pipe joint according to claim 1, wherein the mold has a heat source for heating the mold to a temperature lower than a softening point of the synthetic resin constituting the pipe joint.

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