KR19990075589A - Heat-shrinkable connecting member for connecting synthetic resin pipe - Google Patents

Abstract

The present invention relates to a heat shrinkable connecting member for connecting a synthetic resin pipe to connect the synthetic resin pipe and the synthetic resin pipe, completely covering the connection portion between the pipe and the pipe so that sewage or sewage does not leak from the gap. A polymeric matrix layer, a first fabric reinforcement layer attached to said first polymeric matrix layer, a second polymeric matrix layer attached to said first fabric reinforcement layer, and a second adhered to said second polymeric matrix layer The polymeric mattress layers are composed of a reinforcing fabric layer, a third polymeric matrix layer attached to the second fabric reinforcing layer, and a heat-melt adhesive layer attached to the first polymeric matrix layer, and the polymeric mattress layers. And one of the fabric reinforcing layers is configured to generate heat shrinkage force.

Description

Heat-shrinkable connecting member for connecting synthetic resin pipes.

The present invention relates to a heat-shrinkable connecting member used to connect a synthetic resin pipe and a synthetic resin pipe, and more particularly, connecting the synthetic resin pipe and the synthetic resin pipe, while completely enclosing the connection portion between the sewer pipe and the pipe from the gap. The present invention relates to a heat shrinkable connecting member for connecting synthetic resin pipes to prevent leakage of sewage or sewage.

Recently, synthetic resin pipes have been used for the use of sewage pipes. These synthetic pipes have been widely used because of their light weight and semi-permanent properties compared to concrete pipes that have been used so far.

There are many kinds of such synthetic resin tubes, depending on their diameter, ranging from 150 mm to 1,000 mm and larger to 2,400 mm. One method of producing such a synthetic resin tube is as follows.

First, the synthetic resin is first extruded into a hollow shape, that is, a pipe shape, and then it is continuously wound in a spiral shape on a pipe having a constant diameter, and a flyson made of the same raw material is poured between the spirals and the spirals so as to be attached to each other. .

Therefore, the synthetic sewage pipe produced by this method is hollow in its outer wall, and this hollow shape sufficiently withstands the pressure applied from the outside when the synthetic resin pipe is buried underground. The outer wall hollow form of the synthetic resin tube may have a circular or rectangular or trapezoidal cross-section, and the surfaces thereof are smoothly attached to each other by the parison.

Such a synthetic resin pipe is used for a power line pipe with a small diameter, a bypass channel in a river, a drain pipe for a large diameter, or a bypass channel in a river or the like.

One problem that arises when using synthetic resin pipes as sewage pipes is the connection of plastic pipes and pipes.

Usually, synthetic resin pipes are manufactured to a standard length of 6 m. Therefore, when a synthetic pipe is used as a sewage pipe that is buried over a considerable distance, a plurality of synthetic pipes are connected long, and unlike concrete sewer pipes, gaps are formed in the connection part, and sewage or sewage is leaked therefrom. This often happens.

The gap between the plastic pipe and the pipe is inevitable. One reason for this is that synthetic resin pipes do not have a right angle with respect to the central axis of the pipe even if both end surfaces thereof are not uniform, curved or uncurved. Therefore, a gap is generated in connecting the pipe and the sewage or sewage is leaked therefrom.

Another occurs in laying pipes and pipes, even if the cross section of the plastic pipe is uniform and perpendicular. This means that the sewer pipes buried underground will be placed to be slightly inclined and curved in some places. In such slopes or curved areas, the pipes and the pipe-butting parts will not be completely matched. Make a gap on the right side.

This provides a source of sewage or sewage leaks during the process of connecting the synthetic resin pipes.

Therefore, there is a demand for a connecting member that can completely close such a gap.

The preferred form of such a connecting member should be one that is capable of completely preventing water from leaking out of the connection between the pipe and the pipe so that the synthetic resin pipe properly maintains its function as a sewer pipe.

The other must maintain its function, preferably semipermanently, for a considerable period of time without breakage.

Generally, the resin tube is usually buried underground, and vibration is generated with a high load due to the passage of a vehicle on the ground where the resin tube is buried. Therefore, it can withstand the pressure from the outside and must not be destroyed by vibration.

Another is ease of operation. The other should be easy to construct. It is lighter than a concrete pipe, but it is still hundreds of kilograms, and because of its large diameter, it is not easy to connect the two cross sections exactly. Moreover, the installation of plastic pipes is usually done in a good environment, for example, soil scattered around, a narrow working space, and moreover, there is water attached to the ends of the plastic pipes or dirts such as soil. There are many cases. Therefore, the connecting member used to connect the synthetic resin pipe should be able to be installed in any environment despite moisture or dirt attached to the ends of the synthetic resin pipe.

Patent application 97-22982 by the present inventor for this purpose, in this patent application, the heat shrinkable connecting member for connection of the synthetic resin tube, the heat-shrinkable laminate as a whole, the heat-shrinkable laminate and The heat shrinkable laminate includes a fabric reinforcing layer, a first polymeric matrix layer attached to one side of the fabric reinforcing layer, and the fabric reinforcing layer therebetween. A second polymeric matrix layer attached to the fabric reinforcement layer opposite the first polymeric matrix layer, and an adhesive layer attached to the surface of the second polymer layer; The rail is positioned inside the heat shrinkable laminate by a first end of the heat shrinkable laminate being placed in an extension direction of the synthetic resin tube surrounding the first rod placed near the first end. A first end of the rail and a second end placed in the extending direction of the synthetic resin pipe on the opposite side of the first end of the heat-shrinkable laminate, a second end placed near the second end. Defined as a second portion of the rail that is folded in a wrap-around manner and extends outwardly; The heat shrinkable laminate is defined in width by a distance between a first edge formed by the first portion of the rail and a second edge extending from the second portion of the rail; When the heat shrinkable laminate wraps around the joint of the synthetic resin tube, the connection of the synthetic resin tube is completely surrounded by the adhesive layer attached to the surface of the second polymeric matrix layer of the heat shrinkable laminate.

Therefore, if such a heat shrinkable connecting member is placed in the connecting portion between the synthetic resin tube and the tube, and the channel is inserted between the first and second portions of the rail, the heat shrinkable connecting member becomes a wrap-round type and the connection of the synthetic resin tube It surrounds the site. When heat is applied to the torch or burner, the heat shrinkable laminate shrinks and adheres to the surface of the synthetic resin pipe. At this time, the heat applied to the heat-shrinkable laminate melts the heat-melt adhesive attached to the heat-shrinkable laminate, and the melted heat-melt adhesive completely attaches the heat-shrinkable polymer to the outer surface of the synthetic resin tube, and in particular, the channel Underneath the fittings, the extension from the second part of the channel to the second corner is located to fill the gap between the first part and the second part of the rail, thus completely preventing any sewage or sewage from leaking from it. Can be.

However, when using the connection member of such a structure, when the externally connected synthetic resin sewer pipe is pushed into the excavated ground, the phenomenon that the synthetic resin sewer pipe is not endured and the connection member is broken often occurs. .

This problem does not occur much when the diameter of the synthetic resin sewage pipe is small, but occurs as the diameter of the sewage pipe becomes very large.

Accordingly, there is a need for a heat shrinkable connecting member that can withstand external shocks or pressures sufficiently.

1 is a perspective view of a heat shrinkable connecting member of the present invention.

2 is a sectional view of the sleeve of the heat shrinkable connecting member of FIG.

3A is an enlarged view of the cross section of the first portion and the second portion of the rail in the heat shrinkable connecting member of FIG.

FIG. 3B is a cross sectional view taken along the cut plane in FIG. 3A.

3C is an exploded view of the heat shrinkable laminate in the connecting member of the present invention.

4 is a view showing a shape surrounding the connecting portion of the synthetic resin sewer pipe with the heat-shrinkable connecting member of the present invention.

5 is a cross-sectional view showing a shape cut in a cross section parallel to the axis of the sewer pipe after wrapping the connecting portion of the synthetic resin sewer pipe with the heat shrinkable connecting member of the present invention.

6 is a view showing a shape that appears when cutting to the plane perpendicular to the axial direction of the sewage pipe after wrapping the connecting portion of the synthetic resin sewer pipe with the heat shrinkable connecting member of the present invention.

7a and 7b are yet another embodiment of the present invention.

An object of the present invention is to connect the synthetic resin pipe and the pipe, to provide a connection member that can completely prevent the leakage of water from the connection between the pipe, the connection of the synthetic resin pipe can reduce the breakage rate in the working process To provide a member.

Another object of the present invention is to connect the pipe with the synthetic resin, it is possible to completely prevent the leakage of water from the connection between the pipe, it can maintain the function without long breakage, reduce the breakage rate in the process To provide a connection member of a synthetic resin pipe.

The present invention has many other purposes, which are mentioned together in the description of the present invention.

The present invention for achieving these objects, a first polymeric matrix layer, a first fabric reinforcement layer attached to the first polymeric matrix layer, a second polymeric matrix layer attached to the first fabric reinforcement layer, A second fabric reinforcement layer attached to the second polymeric matrix layer, a third polymeric matrix layer attached to the second reinforcement layer, the third polymeric matrix layer, and attached to the first polymeric matrix layer It is composed of a heat-melt adhesive layer to form a laminate, one of the polymeric matrix layer and the fabric reinforcement layer is to generate heat shrinkage force.

In this case, the heat shrinkage force may be generated when the polymeric matrix layers are crosslinked and then stretched to apply heat. Another method may be to weave at least one of the fabric reinforcing layers into a crosslinked and stretched heat shrinkable fiber such that the heat shrinkable fiber generates heat shrink force when heat is applied.

If it is to be caused by the first, second and third polymeric mattress layers, the polymeric matrix layers are preferably cross-linked and stretched matrix layers.

Such crosslinked and stretched polymeric matrix layers may be made by polymeric materials having elastic predetermined memory properties, as disclosed in US Pat. Nos. 2,027,962, 3,086,242 and 3,597,372, in particular US Pat. No. 2,027,962 As described in the heading, a dimensionally heat stable product is formed in a temporary form in a continuous process, flattened in a dimensionally unstable state, and then cooled and fixed.

Such heat shrinkable polymeric material may be any of the materials disclosed in US Pat. No. 3,086,242, in particular upon thermal shrinkage, for example a crosslinked crystalline plastic material; Other materials, including elastomers, are also suitable. For example, cross-linked polyolefins such as polyethylene, ethylene / vinyl acetate, ethylene / ethyl acrylate copolymers, ethylene-based polymers such as polybutene, for example fluoropolymers such as polyvinylidene fluoride, for example Elastomers mentioned in US Pat. No. 3,597,372. Such materials may be crosslinked by irradiation or by chemical methods.

The fabric reinforcement layer may comprise a heat stable fiber. The thermostable fibers may be glass fiber strips, for example polyester or epoxy bond fibers, glass fiber strips, or plastic materials that do not melt at the shrinkage temperature of the product, for example polytetrafluoroethylene or polyamide (nylon). May be).

Particularly suitable polyamides include, for example, aromatic materials, for example condensation products of m or p-phenylenediamine with telephthalic acid and self-condensation products of p-aminobenzoic acid.

Other non-melt or high-melt synthetic or natural materials such as cellulose materials (eg) and jute can be used. They can optionally be made of glass fiber or other fiber similar to reinforcement. Optionally, the product may be composite, wherein the reinforcement takes the form of a cross section thicker than the remainder of the shrink product.

Another method may be to crosslink and stretch the polymeric matrix layers and to weave the fabric reinforcement layers into the crosslinked and stretched heat-shrinkable fiber such that both the polymeric matrix layer and the fabric reinforcement layer generate heat shrinkage force. .

Polymeric fibers that generate heat shrinkage force may also be made of a polymeric material having elastic predetermined memory properties, as described above. The fiber is drawn in a dimensionally unstable state, and then cooled and fixed. to be.

If the heat shrinking force is to be generated by the fabric reinforcing layer, the fabric reinforcing layer is preferably made of a fabric by weaving the heat shrinkable fiber and the heat stable fiber, and then laminating a polymeric matrix layer thereon. These previously described thermally stable fibers may also be fiberglass strips, for example polyester or epoxy bonded fibers, fiberglass strips, or plastic materials that do not melt at the shrinkage temperature of the product, for example polytetrafluoroethylene or polyamide. (Nylon) can be used.

The adhesive may be a heat melt adhesive, which includes an adhesive based on polyamide polyethylenevinyl acetate copolymer. Such adhesives are shown, for example, in US Pat. Nos. 4,018,733 and 4,181,775.

The heat shrinkable member for connection of the synthetic resin sewage pipe has a rail portion near the pair of corners parallel to the running direction of the sewage pipe among the edges of the heat shrinkable laminate so as to be wrapped around the sewage pipe. It is desirable to be able to fit the rail portion.

The product of the present invention has many uses. It will be appreciated that the examples are better suited for a particular application. For example, products in the form of wraps with aluminum wires or strip structures embedded in or on hot melt adhesives or on mastic are suitable for protecting the connections of plastic pipes and for preventing sewage leakage. The product may shrink and tightly surround the connection, thus tightly joining the larger diameter synthetic resin tube and the smaller diameter synthetic tube to completely prevent sewage leakage.

The fabric reinforcement layer provides mechanical strength and resistance to bending, torsion or stress. In particular, the fabric's toughness and dimensional stability serve to reinforce the polymer sheet, and the polymer sheet protects the fabric from each other and shears external forces onto the fabric. It also plays a role of transferring loads between fabrics and complements to protect fabrics from deterioration or defect growth according to environmental conditions. The dimensions of the fibers in the fabric reinforcement layer depend in particular on the dimensions of the heat shrinkable product, the degree of flexibility required, the dimensions of the objects used and the mechanical properties of all materials involved. Determining the appropriate value for a given application is a matter of routine experimentation and it is also about the selection of proper spacing and location. This double fabric reinforcement layer has a very high resistance compared to a single layer product of the same thickness, and also shows that it is stronger than that of a product having a layer of reinforcement layer.

The heat shrinkable connecting member made according to the invention has been described by way of example only with reference to the accompanying drawings.

Referring first to FIGS. 1 and 2, the heat shrinkable connecting member 10 comprises a polymeric laminate 12, wherein the polymeric laminate 12 is formed of a rail near one end from its central portion. One portion 141 is formed, and a second portion 144 of the rail is formed near the opposite end thereof, and an extension 18 extending therefrom is formed.

The first portion 141 of the rail is such that the polymeric laminate 12 is completely enclosed in the longitudinally extending first rod 161 near the end thereof, the end of which is attached to the central portion 12 which is inside the laminate. It is formed by positioning. At this time, the adhesive attached to the lower surface of the polymeric laminate firmly attaches the first rod 161, and again allows the end to be firmly fused inside.

The second portion 143 of the rail is formed in such a way as to enclose the second rod 163 placed longitudinally near the opposite end of the polymeric laminate 12, the polymeric laminate being the second portion of the rail. It extends further from 143 to form an extension 18. At this time, the heat-melt adhesive is attached to the lower surface of the polymeric laminate to hold the rod 16 firmly.

At this time, the distance from the second portion 143 of the rail to the second end of the heat-shrinkable laminate, the extension 18, the heat-shrinkable laminate 12 when the connecting member wraps the connection of the synthetic resin pipe It is longer than the length so that the 1st edge located in an inside may be covered completely.

Further, the first portion 141 of the rail made of the first rod 161 and the heat shrinkable laminate 12, and the second rod 163 and the heat shrinkable laminate 12 made of the rail In order to easily fit the channel between the two portions 143, the heat shrinkable laminate 12 is folded at a predetermined angle near the first portion 141 of the rail and the second portion 143 of the rail so that the rail extension portion ( 165,167).

When the first portion and the second portion of the rail of the heat-shrinkable connecting member 10 configured as described above are enlarged, the configuration is as shown in FIG. FIG. 3B is an enlarged cross-sectional view of a part of the laminate 12 in FIG. 3A. Referring to FIG. 3A, the fabric reinforcement layer 122 is attached to the lower portion of the first polymeric matrix layer 121, and the second matrix layer 123, and the second fabric reinforcement layer 124, The three polymeric matrix layer 125 and the heat melt adhesive layer 126 are attached. Meanwhile, the first rod 161 and the second rod 163 are surrounded by a hot melt adhesive layer 125 attached under the first polymeric matrix layer 121.

Again, the laminate of the heat shrinkable connecting member will be described with reference to FIGS. 3B and 3C.

Between the first polymeric matrix layer 121 and the second polymeric matrix layer 123, the first fabric reinforcement layer 122 is between the second polymeric matrix layer 123 and the third polymeric matrix layer 125. The second fabric reinforcement layer 124 is located, the fabric reinforcement layers (122, 124) are all woven form. At this time, the first, second and third polymeric mattress layers 121, 123 and 125 are crosslinked and elongated to generate shrinkage force by heat.

The fabric reinforcing layers 122 and 124 form a woven fabric in which heat-stable fibers, such as glass fibers, are placed in the axial direction of the sewer pipe so that thermoplastic fibers are placed in a direction orthogonal to the axial direction of the sewer pipe. Under the third polymeric matrix layer 125, a hot melt adhesive layer 126 mainly composed of polyamide is attached.

In another example, in FIG. 3C, either or both of the first fabric reinforcing layer 122 and the second fabric reinforcing layer 124 are configured to generate heat shrinkage force. At this time, each of the fabric reinforcing layer is a woven fabric of heat-shrinkable fibers and heat-stable fibers, the polymeric matrix layer is laminated on each fabric reinforcement layer.

At this time, the heat stable fiber made of glass fiber or polyester is laid in the axial direction of the synthetic resin tube, and the heat shrinkable fiber is laid in the direction orthogonal to the axis. In particular, heat-shrinkable fibers are stretched and crosslinked to have a wide temperature range for heat.

The adhesive may be a heat melt adhesive, which adhesive may be selected from adhesives based on polyamide polyethylenevinyl acetate copolymers.

This reinforcement provides mechanical strength and resistance to bending, torsion or stress. In particular, the toughness and dimensional stability of the fabric serve to reinforce the polymer sheet, which protects the fabric from each other and shears external forces onto the fabric. It also plays a role of transferring loads between fabrics, and complements to protect fabrics from deterioration or defect growth according to environmental conditions. The dimensions of the reinforcing member depend in particular on the dimensions of the heat shrinkable product, the degree of flexibility required, the dimensions of the objects used and the mechanical properties of all the materials involved. Determining the appropriate value for a given application is a matter of routine experimentation and it is also about the selection of proper spacing and location.

Next, a method of wrapping the connection part of the synthetic resin sewer pipe using the heat shrinkable connecting member of the present invention will be described.

Referring first to Figure 4, a synthetic resin tube is placed on a heat shrinkable connecting member 10 in the form of a wrap. At this time, it is preferable that the connecting portion between the pipe and the pipe be in the middle of the connecting member. Then, the extension 18 of the connecting member 10 enters below the first portion 141 of the rail, and the channel 19 allows the first portion 141 of the rail and the second portion 143 of the rail. To be closed by tightening it. Then, heat is applied to a device such as a torch to shrink the heat shrinkable connecting member 10 so as to be in close contact with the outer surface of the synthetic resin pipe 20. At this time, the hot melt adhesive attached to the inside of the heat shrinkable connecting member is melted and allows the heat shrinkable connecting member 10 to be attached to the surface of the synthetic resin tube 20. When the heat applied in this state is removed, the hot melt adhesive is cooled and the gap between the pipe and the pipe and the gap between the plastic pipe and the connecting member is completely sealed.

5 is a cross-sectional view showing a shape cut in a cross section parallel to the axis of the sewer pipe after wrapping the connecting portion of the synthetic resin sewer pipe with the heat shrinkable connecting member of the present invention.

FIG. 6 is a view showing a shape in which the connecting portion of the synthetic resin pipe is wrapped with the heat shrinkable connecting member of the present invention, and then contracted and then cut into a cross section perpendicular to the axis of the sewer pipe.

The synthetic resin tube 20 is surrounded by an adhesive attached to the inner surface of the heat shrinkable connecting member 10 and tightly coupled to the heat shrinkable connecting member 10 by the adhesive 126.

The channel 19 is fitted between the rail extensions 165 and 167 perpendicular to the connecting member 10 with the first rod 161 and the second rod 163 therein. The extension portion 18 tightly engages with an adhesive, the end of which is attached to the inner surface of the heat shrinkable connecting member, filling the gap between the first rod 161 and the second rod 163. If necessary, it may be desirable to attach the hot melt adhesive to the outer surface of the extension 18 as well.

Therefore, the present invention is a synthetic resin tube and the tube by fully coupling the synthetic resin tube and the connecting member while the melt-bonded adhesive is attached to the inner surface of the connecting member while the synthetic resin tube and the tube is connected by the heat shrinkable connecting member, It is possible to completely prevent the water from leaking from the connection between the.

7a and 7b show another form of the rail portion of the present invention, with reference to FIGS. 7a and 7b, the first portion 241 and the second portion 243 of the rail are each polymeric. The laminate 22 is formed by completely enclosing the first rod 261 and the second rod 263 placed in the longitudinal direction near the end thereof, and placing the end of the laminate 22 at the central portion 22 inside the laminate. do. At this time, the flap 227 made of a hot melt adhesive is attached so as to extend outwardly beyond the inner end of the stack near the second portion 243 of the rail and beyond the second end of the rail. The flap 227 is positioned in the gap between the first and second portions of the rail when the channel is fitted into the first and second portions of the rail so that the hot-lead member forms a wrap-around shape. When melted, it acts to close the gap so that no sewage leaks from it.

The present invention, the heat-shrinkable connecting member is composed of a laminate of a fabric reinforcing layer therein, so the toughness of the fabric serves to reinforce the sheet, the polymer sheet is to keep the fabric to protect each other and to transmit the external force to the fabric or the fabric It is able to withstand the pressure from the outside by transferring the load between them, especially the fabric reinforcement layer is double because the fabric reinforcement layer and the fabric reinforcement layer to act to complement the external force sufficiently. .

In particular, the fibers constituting the fabric reinforcement layer has a low elastic modulus and a small expansion coefficient, thereby preventing the synthetic sewage pipe from being deformed by external forces and sufficiently adapting to seasonal temperature changes.

In addition, the present invention can achieve a very easy connection by simply wrapping the connecting portion of the synthetic resin pipe in the form of a wrap, inserting the channel and shrinking it with heat, thereby completely protecting the connection between the synthetic sewage pipe and the pipe without using a liner. Can be.

Claims (8)

A first polymeric matrix layer, a first fabric reinforcement layer attached to the first polymeric matrix layer, a second polymeric matrix layer attached to the first fabric reinforcement layer, and a second polymeric matrix layer adhered to the second polymeric matrix layer The polymeric mattress comprising a second reinforcing fabric layer, a third polymeric matrix layer attached to the second fabric reinforcing layer, and a heat-melt adhesive layer attached to the first polymeric matrix layer to form a laminate. One of the layers and the fabric reinforcing layer is a heat shrinkable connecting member for the connection of the sewage pipe made of synthetic resin that generates heat shrinkage force. The heat shrinkable connecting member of claim 1, wherein the polymeric matrix layers are crosslinked and stretched to generate the heat shrinkage force. The heat shrinkable connecting member of a synthetic resin sewage pipe according to claim 1, wherein at least one of the fabric reinforcing layers comprises crosslinked and stretched heat shrinkable fibers. The heat shrinkable connecting member of claim 1, wherein at least one of the polymeric matrix layers and the fabric reinforcement layer comprises crosslinked and stretched heat shrinkable fibers to generate the heat shrinkage force. The heat shrinkable connecting member of claim 4, wherein all of the heat shrinkable fibers include crosslinked and stretched heat shrinkable fibers. The heat shrinkable connecting member according to any one of claims 1 to 5, wherein a rail portion is formed near a parallel pair of edges of the heat shrinkable laminate, and when the channel is fitted to the rail portion, the heat shrinkable connecting member is wrapped. Heat-shrinkable connecting member for connecting sewage pipe made of synthetic resin in a round shape. The heat shrinkable connecting member of claim 6, wherein the rail part comprises a first part and a second part of the rail, and the second part of the rail is located inside the laminate. The heat shrinkable connecting member of claim 6, wherein the rail part comprises a first part and a second part of the rail, and the first part and the second part of the rail are positioned near the end of the laminate. .