JP4346385B2 - Terminal fixing part of metal reinforced plastic pipe - Google Patents

Description

  The present invention relates to a terminal fixing portion of a plastic tube reinforced with a metal strip, and more specifically to an improvement of a terminal fixing portion of a metal strip in a connection terminal of a metal reinforced plastic tube.

  Conventionally, for example, a cloth tape is wound on a plastic tube having an outer diameter of about 200 mm, and a metal strip made of steel or the like is spirally wound on the plastic pipe, and then, for example, a cloth tape is wound on the reinforcing layer. After that, a metal reinforced plastic pipe such as a water supply pipe covered with a plastic protective sheath is known.

  When connecting this kind of metal reinforced plastic pipes, as shown in FIG. 7, the protective sheath described above is used to expose the plastic pipe 1 by the length necessary for the connection at the end of the metal reinforced plastic pipe to be connected. Strip the metal strip and metal tape to the required length. Then, a pipe joint is attached so as to straddle the exposed plastic pipes 1.

In FIG. 7, reference numeral 3 denotes a stiffener that is inserted inside the plastic pipe 1 so that the shape of the plastic pipe 1 does not collapse when the pipe joint is mounted, and reference numeral 4 denotes the first insertion into the gap between the pipe joint body 2 and the plastic pipe 1. A protective ring for preventing cold flow of rubber packing, which will be described later, 5 indicates a rubber packing, and 6 indicates a press ring. The push ring 6 and the pipe joint main body 2 are connected to each other by a bolt 9 and a nut 19 with a retainer 7 that presses the packing 5 interposed therebetween.
Reference numeral 8 denotes a lock ring inserted between the press ring 6 and the plastic tube 1, and this lock ring 8 has an opening in its circumferential direction, and teeth are engraved on its inner surface. When the bolt 9 and the nut 19 are tightened, the taper surface of the inner surface of the presser wheel 6 is pressed, and as a result, the teeth bite into the outer surface of the plastic tube 1 and the plastic tube 1 comes out of the pipe joint in the axial direction. Is preventing.
Here, in the case of a pipe joint, in addition to the pipe joint body 2, a protection ring 4, a rubber packing 5, a push ring 6, a retainer 7, a lock ring 8, a bolt 9 and a nut 19 constituting the pipe joint are included. .

  Further, in FIG. 7, the left side of the pipe joint is omitted for easy understanding of the drawing. The reason is that the plastic tube 1 on the left side is connected in the same manner as that on the right side. Moreover, the upper part of the center line of the plastic pipe 1 in FIG. 7 shows a longitudinal sectional view, and the lower part shows a plan view.

  At the other end of the push ring 6, a metal band fixing ring 20 that fixes the metal band 10 spirally wound on the surface of the plastic pipe 1 onto the plastic pipe 1 is attached. This metal band fixing ring 20 is divided into two so that the end of the spirally wound metal band 10 can be sandwiched and fixed between the plastic tube 1 and the flange portions at both ends are tightened with bolts 21. Is mounted on the plastic tube 1 by Thereafter, the metal band fixing ring 20 is connected to the end of the pusher wheel 6 with a bolt or the like.

  If necessary, a cylindrical metal band retaining ring having an opening in the circumferential direction may be mounted inside the metal band fixing ring 20. That is, the metal band retaining ring is first mounted on the metal band 10 outside the plastic tube 1, and the metal band fixing ring 20 is mounted thereon. At that time, since the metal band retaining ring has an opening in the circumferential direction, the diameter of the metal band fixing ring 20 is reduced when the metal band fixing ring 20 is tightened with the bolt 21, and the inner metal band 10 is formed on the surface of the plastic tube 1. Press and fix.

  On the other hand, as another method, a method is also known in which the end of the metal strip 10 is directly welded and fixed to the end of the push ring 6 of the pipe joint.

  By the way, in the case of the method shown in FIG. 7, when this metal-reinforced plastic pipe is a water supply pipe, the pipe joint of this metal-reinforced plastic pipe in the sea or underwater is shaken by waves or the like. As a result, the metal band fixing ring 20 is loosened and the inner metal band 10 is slipped and loosened due to its rigidity, and the protective effect of the plastic tube 1 by the metal band 10 cannot be expected. There was a problem.

  On the other hand, in the case of the method of welding the end of the metal strip 10 to the push ring 6 of the pipe joint, for the convenience of work, this welding work must be performed after the plastic pipes 1 are connected to each other by the pipe joint. Therefore, the surface of the plastic pipe 1 exists immediately next to the metal strip 10 during welding. As a result, when the end of the metal strip 10 is welded to the end of the press ring 6, the tip of the welding rod touches the surface of the plastic tube 1 or the surface of the plastic tube 1 is melted by the heat generated during welding. There was a problem of attaching.

  In view of the above problems, the object of the present invention is to prevent the metal band fixed with the metal band fixing ring from being loosened over time even if a metal reinforced plastic pipe having a pipe joint is used over a long period of time. It is an object of the present invention to provide a terminal fixing portion of a metal reinforced plastic pipe that does not damage the surface of the inner plastic pipe when the metal band is fixed.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a pipe joint at a portion of the end of the metal reinforced plastic tube in which the metal band is spirally wound around the outside of the plastic pipe, from which the metal band is removed. An end fixing portion of a metal reinforced plastic pipe that is mounted and fixed to the end of the pipe joint, and the metal band fixing ring is connected to the end of the pipe joint. In the metal band fixing ring, a metal band retaining ring having an opening in the circumferential direction is mounted on the inner side of the metal band fixing ring, and spirally wound inside the metal band retaining ring from a metal band extraction slit provided in the metal band retaining ring. The end of the metal strip is pulled out, and the end of the pulled out metal strip is folded back in the direction opposite to the spiral winding direction of the metal strip, and the end of the folded metal strip is used as the metal strip. Fixed And it is characterized in that it is sandwiched by and pressed by grayed and said metal strip retaining ring.

  According to the end fixing portion of the metal reinforced plastic pipe of the present invention thus configured, a metal band retaining ring having an opening in the circumferential direction is mounted inside the metal band fixing ring, and the metal band The end of the metal band spirally wound inside the metal band retaining ring is drawn out from the metal band extraction slit provided in the retaining ring, and the end of the drawn metal band is made of the metal band. It is folded back in the direction opposite to the spiral winding direction. And since the end portion of the folded metal band is sandwiched between the metal band fixing ring and the metal band retaining ring in a pressed state, the metal reinforced plastic pipe having this pipe joint is in the sea or water, Even if it continues to receive vibrations caused by waves, the metal band will not easily slip out of the metal band fixing ring. Therefore, the metal strip can be securely fixed to the end of the pipe joint over a long period of time, and thus the plastic pipe can be reliably protected with this metal strip for a long period of time.

  Further, according to the present invention, since the welding work is not required for fixing the metal strip, there is no concern that the surface of the plastic pipe is melted and damaged by the welding work.

  The terminal fixing portion of the metal reinforced plastic pipe according to the present invention as defined in claim 2 is a tube at a portion of the metal reinforced plastic pipe end where the metal band is spirally wound around the outside of the plastic pipe. A metal reinforced plastic pipe end having a joint attached thereto, the metal band fixed by a metal band fixing ring attached to an end of the pipe joint, and the metal band fixing ring connected to the end of the pipe joint In the fixing portion, a metal band retaining ring having an opening in the circumferential direction is attached to the inside of the metal band fixing ring, and an end of the metal band is connected to the inside or the outside of the metal band retaining ring. It is a feature.

  According to the second aspect of the present invention, the metal band retaining ring having an opening in the circumferential direction is used. For example, the end of the metal band is previously provided inside or outside the metal band retaining ring. It can be connected by welding or the like, and then the metal band retaining ring can be mounted on the plastic pipe with its opening wide open and placed next to the push ring of the pipe joint. That is, the end of the metal strip can be welded to the inside or the outside of the metal strap retaining ring at a location away from the surface of the plastic tube, so that the surface of the plastic tube is melted and damaged by the heat of welding during the welding operation. No fear.

Moreover, because the end of the metal band is fixed to the inside or outside of the metal band retaining ring by welding, for example, by welding, the metal reinforced plastic pipe having this pipe joint is in the sea or underwater, and vibration due to waves, etc. Even if it continues receiving, simply, the metal band will not slip out of the metal band retaining ring and consequently from the metal band fixing ring.
Therefore, the metal band can be securely fixed to the end of the pipe joint for a long period of time, and the protection of the plastic pipe by the metal band can be ensured for a long period of time.

  The terminal fixing portion of the metal reinforced plastic pipe according to the present invention as defined in claim 3 is a pipe at a portion where the metal band of the metal reinforced plastic pipe having the metal band spirally wound around the outside of the plastic pipe is removed. A metal reinforced plastic pipe end having a joint attached thereto, the metal band fixed by a metal band fixing ring attached to an end of the pipe joint, and the metal band fixing ring connected to the end of the pipe joint In the fixing portion, the metal band fixing ring has an opening in the circumferential direction or is divided into two, and an end portion of the metal band is connected to the inner side or the outer side. It is.

  According to the invention described in claim 3, the connection work such as welding can be performed at a place away from the plastic pipe when the end of the metal band is connected to the inside or the outside of the metal band fixing ring, etc. In addition to the similar effect obtained by the invention described in claim 2, the metal band retaining ring required in the invention described in claim 2 is unnecessary, so that the workability is easy and the cost is reduced. be able to.

  As described above, according to the terminal fixing portion of the metal reinforced plastic pipe of the present invention, even if the metal reinforced plastic pipe having a pipe joint is used for a long time, the metal is fixed with the metal band fixing ring over time. It is possible to provide a terminal fixing portion of a metal reinforced plastic pipe that does not damage the surface of the inner plastic pipe when the band loosens and comes off from the metal band fixing ring, or when the metal band is fixed.

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

1 to 3 show an embodiment (first embodiment) of a terminal fixing portion of a metal-reinforced plastic pipe according to claim 1 of the present invention. Incidentally, FIG. 1 shows a longitudinal sectional view of the upper part of the center line of the terminal fixing part of the metal-reinforced plastic pipe, and the lower part is omitted.
In FIG. 1, the same parts as those shown in FIG. 7 described above are denoted by the same reference numerals, the detailed description will be simplified, and the features of the present invention will be mainly described in detail.

In FIG. 1, the stapler 3, the protective ring 4, the rubber packing 5, the pusher wheel 6, the retainer 7, the lock ring 8, and the bolt 9 and the nut 19 that connect the pusher wheel 6 to the pipe joint body 2 are basically shown in FIG. 7. It is the same as the conventional one shown.
The feature of the terminal fixing part of the metal reinforced plastic pipe of the present invention shown in FIG. 1 is the metal band retaining ring 30 mounted inside the metal band fixing ring 20.

As shown in FIG. 2, the metal band retaining ring 30 has an opening 31 in the circumferential direction thereof, and an end of the metal band 10 located inside the metal band retaining ring 30 as will be described later. This is in that a metal band extraction slit 32 is provided to draw the portion to the outside of the metal band retaining ring 30.
Here, the metal strip drawing slit 32 is not limited to a slit having one end opened as shown in FIG. 2, and may be a hole having a length equal to or greater than the width of the metal strip 10. That is, the slit here is a notch that allows the metal strip 10 to be pulled out to the outside of the metal strap retaining ring 30 and may have a shape as shown in FIG. 2 or a hole. And
As shown in an imaginary line in FIG. 2 and FIG. 3 to be described later, the drawing end 11 of the metal band 10 drawn out from the metal band drawing slit 32 to the outside of the metal band retaining ring 30 is formed of the plastic band 1. It is folded back in the direction opposite to the spiral direction.

FIG. 3 is a cross-sectional view of the cross section taken along the line AA in FIG. As shown in FIG. 3, a metal strip 10 is spirally wound on a connecting end portion of a plastic tube 1 having a stiffener 3 inserted in order to protect the shape of the plastic tube 1, and a metal strip is wound thereon. A retaining ring 30 is mounted, and a metal band fixing ring 20 is mounted thereon.
The metal band retaining ring 30 can be mounted on the plastic pipe 1 by opening the opening 31 or is passed through the plastic pipe 1 in advance, and a pipe joint is attached to the plastic pipe 1, and then the press ring 6 is attached. It can be moved to the side and mounted at a predetermined position.

Then, as shown by the imaginary line in FIG. 2, the end of the metal band 10 is drawn out of the metal band retaining slit 30 to the outside of the metal band retaining ring 30 and spirally wound on the plastic tube 1. The drawer end 11 is formed by folding back in the direction opposite to the direction in which it was placed.
Then, in FIG. 3, a bolt (not shown) is passed through a bolt hole provided in the flange 22 of the metal band fixing ring 20 divided into two, and the metal band is fixed by tightening the bolt. If the ring 20 is fixed to the surface of the plastic tube 1 in a pressed state, the metal band retaining ring 30 has an opening 31, so the metal band retaining ring 30 is reduced in diameter and fixed to the surface of the plastic tube 1 in a pressed state. Is done. As a result, the leading end 11 of the metal band 10 is sandwiched in a pressed state between the metal band fixing ring 20 and the metal band retaining ring 30 and is securely fixed.

  As shown in FIG. 1, the metal band fixing ring 20 is connected to the end of the push ring 6 by a bolt 40 so as not to rotate on the plastic tube 1. Therefore, there is no fear that the metal band fixing ring 20 rotates and as a result, the metal band 10 is loosened.

In this way, the end of the metal band 10 is folded back in the direction opposite to the direction in which the metal band 10 is spirally wound to form the lead-out end 11, which is pressed and held between the metal band fixing ring 20 and the metal band retaining ring 30. Therefore, even if the end fixing portion of the metal reinforced plastic tube is in water or in the sea and repeatedly receives vibration, the end portion of the metal strip 10 does not easily come off from the metal strap fixing ring 20. Therefore, since the metal strip 10 can be reliably fixed to the end of the pipe joint over a long period of time, the plastic pipe 1 can be reliably protected by the metal strip 10 for a long period of time.
Also, since this method does not require welding work, the surface of the plastic tube 1 is not damaged by welding heat or the like.

In FIG. 3, the metal band fixing ring 20 is of a split type, in which bolts are tightened through bolt holes provided in the flanges 22 at both ends, but the opening is not as in the metal band retaining ring 30 of FIG. It may be one place. That is, the flange 22 may be one place. In addition to this, a male screw is provided on the outer periphery of the end of the pusher wheel 6 as in the metal band fixing ring 20 described in the embodiment of the invention described in claim 2 to be described later, and a female screw to be screwed into this is provided. The metal band fixing ring 20 is provided on the inner side of the metal band fixing ring 20, and is screwed into the push ring 6 side to be attached to the metal band retaining ring 30 and the metal band drawing slit 32 of the metal band retaining ring 30. It may be of a type in which the drawer end 11 of the metal strip 10 drawn out and folded back is pressed and fixed.
In this way, there is an advantage that the metal band retaining ring 30 can be fixed and the metal band fixing ring 20 can be connected to the push ring 6 at the same time.

4 to 5 show an embodiment (second embodiment) of a terminal fixing portion of a metal-reinforced plastic pipe according to claim 2 of the present invention.
FIG. 4 shows a cross-sectional view of a state in which the metal band retaining ring 30 is mounted on the plastic tube 1 in which the above-described stiffener 3 is inserted and the metal band 10 is spirally wound on the outer periphery. The end of the metal band 10 is connected to the inner surface (inside) of the metal band retaining ring 30 by welding in advance, and the opening 31 is opened after the welding is completed and is covered with the plastic pipe 1.

  When the metal retaining ring 30 is positioned on the plastic pipe 1 as shown in FIG. 4, a female screw to be screwed into a male screw provided on the surface of the push ring 6 side of the pipe joint in advance as shown in FIG. The metal band fixing ring 20 is tightened and the metal band retaining ring 30 is fixed by the metal band fixing ring 20.

The metal band fixing ring 20 may be connected to the push ring 6 side via an intervening part having one end connected to the metal band fixing ring 20 and the other end connected to the push ring 6 side. . 4 and 5, the end of the metal band 10 is attached to the inner surface of the metal band retaining ring 30 having a shape in which the flange portion of the metal band retaining ring 30 is eliminated, that is, a simple cylindrical metal band retaining ring 30 with an opening. They may be welded and tightened with the metal band fixing ring 20 having the shape shown in the first embodiment. The point is that the metal band retaining ring 30 in which the end of the metal band 10 is welded to the inner surface can be securely fixed in the vicinity of the push ring 6 and can be connected to the push ring 6 in various shapes. Can be adopted.
In any case, since the metal band fixing ring 20 is connected to the push ring 6 on the pipe joint side, the metal band fixing ring 20 rotates on the plastic pipe 1 and there is no possibility that the metal band 10 is loosened.

4 to 5, the end of the metal band 10 is welded to the inner surface of the metal band retaining ring 30, but the metal band 10 is bonded to the outer surface (outer side) of the metal band retaining ring 30. What welded the edge part of may be sufficient.
In this case, as shown in FIG. 2 described above, a metal band drawing slit 32 is provided in advance in the metal band retaining ring 30, and the metal band drawing slit 32 is spirally wound inside the metal band retaining ring 30. The end of the metal band 10 may be pulled out to the outside of the metal band retaining ring 30 and this end may be welded to the outer surface of the metal band retaining ring 30.
In each of the above embodiments, the end of the metal band 10 is connected to the inner surface or the outer surface of the metal band retaining ring 30 by welding. However, the connection method is not limited to this, and connection with screws or an adhesive may be used. .

As described above, according to the second aspect of the present invention, although the end of the metal band is welded to the inner surface or the outer surface of the metal band retaining ring 30, for example, the welding operation is separated from the surface of the plastic pipe 1. Therefore, there is no fear that the surface of the plastic tube 1 is melted or damaged by heat during welding or a welding rod. Moreover, since the end of the metal band 10 is connected to the inner surface or the outer surface of the metal band retaining ring 30 by welding or the like, it is not easily peeled off from the inner surface or the outer surface of the metal band retaining ring 30.
Therefore, even if the terminal fixing portion of the metal reinforced plastic pipe is subjected to vibration due to the influence of the waves, the metal band 10 does not come off from the metal band retaining ring 30 and loosen, and the terminal of the plastic pipe 1 by the metal band 10 over a long period of time. The part can be protected.

Next, an embodiment (third embodiment) of the terminal fixing portion of the metal-reinforced plastic pipe according to claim 3 of the present invention will be described with reference to FIG. 6 is a cross-sectional view seen from the same direction as FIG.
FIG. 6 shows a structure in which the end 11 of the metal band 10 is directly connected to the inner surface (inside) of the metal band fixing ring 20 by welding or the like. In this example, the metal band fixing ring 20 is of a split type, and bolts are passed through bolt holes provided in the flange portions 22 on both sides, which are tightened with nuts and fixed on the plastic pipe 1.
The metal band fixing ring 20 is not limited to the split type shown in the figure, and may have an opening in the circumferential direction. In that case, flanges are formed in the openings, bolts are passed through holes provided in the flanges, and are fastened together with nuts to be fixed on the plastic pipe 1.

  In the case of the end fixing portion of the metal reinforced plastic pipe according to claim 3 of the present invention shown in FIG. 6, the connecting operation of the end of the metal band 10 to the inner surface of the metal band fixing ring 20, for example, the welding operation, In addition to the effects of the second embodiment described above that the surface of the plastic tube 1 is not damaged, the metal band retaining ring 30 is unnecessary compared to the second embodiment. The number of parts required for work is reduced. As a result, connection work is facilitated, and cost can be reduced.

  Further, in the embodiment shown in FIG. 6, the end 11 of the metal band 10 is connected to the inner surface of the metal band fixing ring 20, but a metal band drawing slit as shown in FIG. The end of the metal band 10 may be drawn out from the slit and connected to the outer surface (outside) of the metal band fixing ring 20 by welding or the like.

It is a half sectional view showing one example of the present invention. FIG. 2 is an enlarged perspective view of a metal band retaining ring used in the first embodiment of the present invention shown in FIG. 1. FIG. 2 is a transverse cross-sectional view showing a first embodiment of the present invention when a cross section taken along line AA of FIG. It is a cross-sectional view showing a second embodiment of the present invention and showing a state in which a metal band retaining ring is mounted on a plastic pipe. The 2nd Example of this invention is shown and it is a longitudinal cross-sectional view of a pipe joint end part. The 3rd Example of this invention is shown and it is a cross-sectional view of a pipe joint edge part. It is a partial cutaway top view which shows the terminal fixing | fixed part of the conventional metal reinforcement plastic tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic pipe 2 Fitting body 6 Press ring 10 Metal strip 11 Draw end
20 Metal Band Fixing Ring 30 Metal Band Retaining Ring 31 Opening 32 Metal Band Drawer Slit

Claims (3)

  A metal band fixing ring in which a pipe joint is attached to a portion of the end of a metal reinforced plastic pipe formed by spirally winding a metal band on the outside of the plastic pipe, and the end of the pipe joint is attached. The metal band fixing ring is connected to the end of the pipe joint, and the metal band fixing ring has an opening in the circumferential direction inside the metal band fixing ring. A metal band retaining ring is mounted, and an end of the metal band spirally wound inside the metal band retaining ring is pulled out from the metal band drawing slit provided in the metal band retaining ring, and the metal band is pulled out. The end of the metal band is folded back in the direction opposite to the spiral winding direction of the metal band, and the end of the folded metal band is sandwiched and pressed between the metal band fixing ring and the metal band retaining ring. This Terminal fixing portions of the metal reinforcing plastic tube according to claim.   A metal band fixing ring in which a pipe joint is attached to a portion of the end of a metal reinforced plastic pipe formed by spirally winding a metal band on the outside of the plastic pipe, and the end of the pipe joint is attached. The metal band fixing ring is connected to the end of the pipe joint, and the metal band fixing ring has an opening in the circumferential direction inside the metal band fixing ring. An end fixing portion of a metal reinforced plastic pipe, wherein a metal band retaining ring is attached, and an end of the metal band is connected to the inside or the outside of the metal band retaining ring.   A metal band fixing ring in which a pipe joint is attached to a portion of the end of a metal reinforced plastic pipe formed by spirally winding a metal band on the outside of the plastic pipe, and the end of the pipe joint is attached. In the terminal fixing part of the metal reinforced plastic pipe, in which the metal band is fixed and the metal band fixing ring is connected to the end of the pipe joint, the metal band fixing ring has an opening in its circumferential direction or An end fixing portion of a metal-reinforced plastic pipe, which is divided into two and has an end portion of the metal strip connected to the inside or the outside.

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