JP3628568B2 - Fixing structure of pipe end anticorrosion core - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used for a turbulent pipe (cut pipe) necessary for constructing a pipeline, and particularly relates to the structure of a corrosion prevention core on the end face of a metal pipe cut pipe used for water supply or the like.
[0002]
[Prior art]
Conventionally, when a ductile cast iron pipe is buried in the ground and a pipe line is laid, the entire pipe is protected against corrosion by painting or lining, and as shown in FIG. In general, the insertion port 2a of the tube 2 is inserted and joined. At this time, as shown in the figure, in the NS type joint provided with earthquake resistance, the lock ring 3 is provided on the inner surface of the receiving port 1a, and the projection 4 gets over the lock ring 3 as shown by the chain line in the figure. Insert the insertion slot 2a. In the figure, 5 is a packing and 6 is a lining.
[0003]
In the laying of this pipe line, there is a case where the pipe 2 is not always connected only by a fixed-size pipe, but the pipe 2 must be cut and joined so as to have a predetermined length at the construction site. When the tube 2 is cut in this way, the coating is peeled off and the background is exposed on the tube end surface that becomes the cut surface, so that the anticorrosion function is impaired and red water or the like is generated. Therefore, in general, the anticorrosion coating is applied again to the end face after the cut tube to perform the anticorrosion. However, when anticorrosion paint is applied to the end face after the cut tube and the anticorrosion is applied again, it takes time to dry in cold weather, and it is difficult to apply in places where running water does not stop completely, such as switching work. There is a problem that it is difficult to work.
[0004]
For this reason, as a method other than applying the anticorrosion paint to the end face after the cut tube, there is a method of sealing the exposed portion using the anticorrosion core 7, as shown in FIG. Since this anticorrosion core 7 is made of an elastic body such as rubber, it is held by its elasticity. However, as shown in Japanese Patent Laid-Open No. 7-139686, etc. There is a type in which the anticorrosion cap 7 is fixed from the inner surface by means of a diameter expansion force using a fixing ring 8 that is open.
[0005]
[Problems to be solved by the invention]
However, since the fixing ring 8 fixes the anti-corrosion cap 7 with a large opening force, the expansion force is attenuated due to deterioration of the material of the fixing ring 8 over time, and the anti-corrosion function is maintained. There is a problem that there is a limit to continuing to do so and the reliability is low.
[0006]
An object of the present invention is to suppress the aging deterioration of the diameter expansion force as much as possible.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a diameter reduction preventing function between both ends of the split of the fixing ring. With this function, regardless of whether the fixing ring is open or not, the degree of attenuation of the diameter expansion force over time is moderate as compared with the conventional one.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, a fixing ring is provided over the entire inner surface of the cylindrical portion inserted into the inner surface of the tube end portion of the tube end anticorrosion core, and the anticorrosion core is connected to the cylindrical portion by the fixing ring. pressed against the at fixed constructed tube end, the fixing ring in the circumferential direction one split, the ends are overlapped, locking piece at the other end into the hole of one end threaded insert, the locking piece may extend in a circumferential direction one end side of the fixing ring rises from the other end, after being passed inserted into the hole of the end, may be employed in fold back configuration. In this configuration, when the locking piece is folded back, the bent portion and the edge of the through hole are locked, and the function of preventing the diameter reduction of the fixing ring is achieved.
[0009]
In this configuration, one end of each of the fixing rings is formed with a narrow neck portion, and one end of the fixing ring is slidably inserted into a long hole in the circumferential direction of the fixing ring at the other end via the neck portion. If the width of one end is larger than the width of the elongated hole and is prevented from coming off, the expansion and contraction diameter of the fixing ring is smoothly adjusted by the movement of the one end in the elongated hole. The That is, the movement becomes a guide.
[0010]
【Example】
FIG. 1 is a front view showing a fixing ring having a function of preventing diameter reduction according to the present invention. This fixing ring 10 is a 10% form that has been conventionally used, and a tip 11 having a notch on the A side. The other end 13 on the B side is formed with a long hole 14 that crosses the neck portion 11a of the tip 11 and a locking piece 15 that is inserted into the hole 12. The locking piece 15 is formed from the B side. It rises and extends to the circumferential direction A side of the fixing ring 10. Reference numeral 16 denotes a jig hole provided for expanding the fixing ring 10 by using a snap ring pliers 20 or the like to be fitted into the pipe end anticorrosion core 7, and there is no problem even if it is not provided. The material of the fixing ring 10 is preferably a springy stainless material, but is not particularly limited to a material having no springiness.
[0011]
2 and 3 are perspective views showing the mounting procedure of the fixing ring 10, and the anticorrosion core 7 is generally used. An annular groove 9 for fitting the fixing ring 10 is provided on the inner surface. (See FIG. 8). First, as shown in FIG. 2 (a), the fixing ring 10 is formed into a circular shape, and then, as shown in FIG. 2 (b), after the tip 11 is put on the elongated hole 14, the locking piece 15 is inserted into the hole 12, The outer diameter of the ring 10 is made smaller than the inner diameter of the core 7, and the fixing ring 10 is placed in the annular groove 9 on the inner surface of the core 7 as shown by the solid line from the chain line in FIG. The fixing ring 10 is expanded on the inner surface of the core 7 using a tool (see FIG. 2 (b)), and the locking piece 15 being removed from the hole 12 is bent as shown in FIG. 2 (c). Fix so as not to shrink in the circumferential direction.
[0012]
In addition to preventing the core 7 from falling off due to water flow by mounting the fixing ring 10 on the inner surface of the core 7 in this way, the tip 11 is put on the elongated hole 14, thereby the length of the elongated hole 14. The ring 10 can absorb the tolerance of the circumference of the inner diameter of the tube, and the ring 10 can be smoothly fixed to the core 7, and the locking piece 15 prevents the diameter reduction over a long period of time and firmly fixes the core 7 to the end of the tube to prevent red water. To do.
[0013]
FIG. 4 shows another embodiment. In this embodiment, the slot 14 and the locking piece 15 are continuously cut out, and the mobility of the tip 11 is increased, so that the fixing ring 10 and the anticorrosion are protected. The circumferential length difference (circumferential dimensional tolerance) of the core 7 can be absorbed more greatly. Further, if the hole 12 is lengthened, the locking piece 15 can be easily inserted, the locking piece 15 can be easily bent, and the hole 12 can be smoothly bent along the other end 13.
[0014]
As shown in FIG. 5, when the rising hole 16a is formed around the jig hole 16, the wall 16a is reinforced when the ring 10 is expanded or contracted by the jig such as the snap ring pliers 20 or the like. The jig 20 is difficult to be removed from the hole 16, and the operation is smooth. The wall 16a may be formed by cutting and raising when the hole 16 is formed. If the wall 16a is an inclined wall as shown in FIG.
[0015]
Moreover, it can replace with the jig | tool hole 16 and can also be used as a latching protrusion. For example, as shown in FIGS. 6A to 6C, a projection 17 bulged in an arc shape can be adopted, and this projection 17 is engaged with the jig 20 as shown in FIG. To do. At this time, the locking hole 17a of the jig 20 may be formed in the protrusion 17 as shown in FIG.
[0016]
【The invention's effect】
As described above, since the present invention provides the fixing ring with the function of preventing the diameter reduction, the aging degradation of the diameter expansion force of the fixing ring is also suppressed, and therefore, the sufficient adhesion to the tube end of the waterproof core has also been maintained for many years. It is maintained over a long period of time, and red water can be prevented over a long period of time.
[Brief description of the drawings]
FIG. 1 is a plan view of a fixing ring according to an embodiment. FIG. 2 is a mounting action diagram of the fixing ring. FIG. 3 is a mounting action view of the fixing ring. Fig. 5B is a plan view of the fixing ring. Fig. 5 is a sectional view of the main part of each of the other embodiments. Fig. 6 is a perspective view or sectional view of the main part of the other embodiment. 7] Cross-sectional view of the main part of the pipe joint [Fig. 8] Enlarged cross-sectional view of the main part of the pipe insertion opening
1, 2 Tube 1a Receptor 2a Insert 7 Corrosion-proof core 8, 10 Corrosion-proof core fixing ring 11 One end (tip) of the fixing ring
11a One end neck portion 12 Locking piece insertion hole 13 The other end 14 of the fixing ring 10 Long hole (long hole)
15 Locking piece 16 Jig hole 17 Locking protrusion 20 Snap ring pliers (expansion jig)

Claims (3)

A fixing ring 10 is provided over the entire inner surface of the cylindrical portion inserted into the inner surface of the tube end portion of the tube end anticorrosion core 7, and the anticorrosion core 7 is pressed against the inner surface of the tube end portion by the fixing ring 10. A structure fixed to the pipe end,
The fixing ring 10 is divided by one in the circumferential direction, and both ends 11 and 13 are overlapped. A locking piece 15 at the other end 13 is inserted into the hole 12 at the one end 11 , and the locking piece 15 is circumferentially extending one end 11 side of the fixing ring 10 rises from the other end 13 side, after being passed inserted into the hole 12 of the end 11, is returned Ri folded, by the folding of that, contraction of the fixing ring 10 A structure for fixing a pipe end anticorrosion core, which is provided with a diameter prevention function. A narrowed neck portion 11a is formed at one end 11 of the fixing ring 10, and the one end 11 is slid through the neck portion 11a into a long hole 14 which is long in the circumferential direction of the fixing ring 10 at the other end 13a. The tube end anticorrosive core fixing structure according to claim 1, wherein the tube end anticorrosive core is fixedly inserted, and the end 11 has a width wider than that of the long hole 14 and is prevented from coming off. Fixing is provided over the entire inner surface of the cylindrical portion inserted into the inner surface of the tube end portion of the tube end anticorrosion core 7, and the anticorrosion core 7 is fixed to the tube end by pressing the cylindrical portion against the inner surface of the tube end portion. Ring 10,
In the circumferential direction, one end 11 is formed with a narrow neck portion 11a, and a hole 12 is formed on the other end 13 side of the neck portion 11a, and the other end 13 is formed through the neck portion 11a. One end 11 of the long hole 14 is slidably inserted in the long hole 14 in the circumferential direction, the width of the one end 11 is wider than the width of the long hole 14, and the other end is inserted into the hole 12 of the one end 11. 13 the locking piece 15 is passed inserted, the engaging piece 15 extends in the circumferential direction one end 11 side of the fixing ring 10 rises from the other end 13 side, through inserting into the hole 12 of the end 11 The tube end anticorrosion core fixing ring is provided with a function of preventing the diameter reduction of the fixing ring 10 by being folded back .

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