JP2000304176A - Earthquake-resistant pipe joint for deformed pipe, and method and jig for connecting the pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection of an earthquake-resistant joint pipe even when a gap between an insertion port outer surface and a socket inner surface is small and insertion of an expansion jig is difficult to make, in a pipe joint designed to prevent the occurrence of pull-off through engagement of an insertion port protrusion part with a lock ring. SOLUTION: This earthquake-resistant pipe joint is formed that a lock ring containing groove 3 is formed in the inner surface of a socket 2, a one-split lock ring 5 is contained in the containing groove 3 of the lock ring through a rubber 4 for centering, by spreading the split 5a, an insertion port 6 provided at its tip with a protrusion part 7 is inserted in the socket 2, and after insertion, the lock ring 5 is constructed to its original size to effect engagement with the insertion port protrusion part 7. In this case, a guide groove 11 is formed in a manner to extend from the opening end of a pipe socket 2 to the containing groove 3 of the lock ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic pipe joint for a deformed pipe, a method of connecting the same, and a jig for connection.

[0002]

2. Description of the Related Art As a seismic pipe joint, a pipe joint as shown in FIG. 8 is known, and this pipe joint is provided at the inner surface of a receiving port 2 formed at one end of a pipe 1 like a normal pipe joint. While the centering rubber 4 and the lock ring 5 are stored in the storage groove 3, a protrusion 7 is formed at the end of the insertion port 6 at the other end of the tube 1, and the insertion port 6 is formed in the receiving port 2.
After insertion and joining, when a release force acts on the pipe, the projection 7 is engaged with the lock ring 5 to prevent the pipe from coming off.

In the drawings, reference numeral 8 denotes a rubber ring for sealing, 8a denotes a backup ring, 9 denotes a push ring, and 10 denotes a bolt and nut for fastening the push ring. By the way, when trying to perform simple joining without using a large-sized joining jig such as a hydraulic device for the connection work of the seismic pipe joint, the insertion projection 7 comes into contact with the lock ring 5 to prevent the insertion failure. Conventionally, as shown in FIG. 9, before the insertion port 6 is inserted into the receiving port 2, the expansion jig 16 is inserted into the gap S between the outer surface of the receiving port 6 and the inner surface of the receiving port 2 from the receiving port opening end.
Is inserted and the split part is widened by rotating the large-diameter bolt 17 as shown in FIG. 10, and the lock ring 5 as shown in FIG.
Is inserted into the storage groove 3 so as not to cause resistance, and the insertion convex portion 7 is passed through as shown by an arrow. Thereafter, the expansion jig 16 is removed, the lock ring 5 is restored and reduced, and the insertion projection is removed. It was made to be able to engage with the part 7.

As shown in FIG. 10, the diameter-enlarging bolt 17 is provided with a nut 17c at the center and a right-hand screw 17a and a left-hand screw 17b on both sides of the nut 17c. With the rotation in the same direction, the expanding jigs 16 on both sides approach or separate from each other.

[0005]

However, when the above-mentioned expanding jig 16 is inserted, a gap S for inserting the expanding jig 16 between the outer surface of the insertion port 6 and the inner surface of the receiving port 2 is locked. A gap S between the distal end portion 3b of the bank wall 3a forming the outer surface of the receiving opening of the ring storage groove 3 and the outer surface of the insertion opening 1 is necessarily required, and if there is no gap S, joining is extremely difficult or impossible. There was a problem.

However, in the case of a seismic pipe joint of a deformed pipe in which a receiving port is formed at one end of a curved pipe, even if the pipe is formed within the dimensional tolerance, the receiving port having the minimum diameter within the tolerance and the maximum port within the tolerance. When combined with an insertion opening having a diameter, the gap S may be almost eliminated, and there is a problem that the insertion of the expanding jig 16 becomes impossible and a simple joining operation becomes difficult. The present invention solves the above-described problems and easily applies a seismic pipe using a jig even in the case of a deformed pipe seismic pipe joint in which a gap between the inner surface of the receiving port and the outer surface of the insertion port is almost eliminated due to dimensional tolerances. The object of the present invention is to enable connection of a joint.

[0007]

According to a first aspect of the present invention, there is provided an earthquake-resistant pipe joint according to the first aspect, wherein a lock ring storage groove is formed on an inner surface of the pipe socket, and a centering rubber is provided in the storage groove. The lock ring is housed, the split portion of the lock ring is widened, an insertion port having a projection at the tip is inserted into the receptacle, and after the insertion, the lock ring is reduced in diameter to the original state, and the insertion is performed. In a seismic pipe joint of a deformed pipe adapted to be engageable with a mouth projection, a guide groove extending from an open end to a storage groove of the lock ring is formed in an inner surface of the pipe socket.

According to the present invention, since the guide groove extending from the open end to the storage groove of the lock ring is formed on the inner surface of the receiving port, even if the gap is small, the expanding jig can reliably use the guide groove. The jig can be easily pulled out after connecting the pipe. According to a second aspect of the present invention, the centering rubber is stored in the storage groove of the lock ring of the deformed pipe according to the first aspect, and then the split lock ring is stored. Then, a magnifier is inserted into the split portion of the lock ring, the split portion is expanded, the diameter of the lock ring is enlarged, the entire lock ring is stored in the storage groove, and then the expanded split portion is inserted. After inserting the plate-shaped body and removing the magnifier, arranging the handle of the plate-shaped body along the guide groove, inserting an insertion port having a projection at the tip into the receptacle, If the projection is inserted beyond the lock ring position to the inner part of the receptacle, the plate-like body is pulled out through the guide groove, the lock ring is reduced in diameter to the original, and the projection can be engaged with the insertion projection. It is like that.

According to this method, the diameter of the lock ring can be reliably increased by arranging a thin plate in the guide groove, and the pipe can be easily pulled out after connecting the pipe. Even if there is no gap between them, connection can be easily made. A connecting jig for a deformed pipe seismic pipe joint according to claim 3 is a wide plate-shaped body inserted into a split portion of a lock ring housed in a pipe receptacle in the deformed pipe seismic pipe joint according to claim 1; The guide arm includes a guide arm extending from the plate-like body and arranged along a guide groove on the inner surface of the pipe receiving port, and a grip formed on the guide arm outside the guide groove.

According to the jig for connecting a seismic pipe joint of the present invention, it is possible to easily maintain the large-diameter body of the lock ring simply by inserting the wide plate-like body at the tip into the widened split portion. Can,
In addition, if the grip portion is supported and pulled in the axial direction, it can be easily pulled out.

[0011]

Next, an embodiment of the present invention will be described. FIG. 1 is a sectional view of an earthquake-resistant pipe joint of a deformed pipe according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line aa of FIG.
FIG. 3 is a perspective view of a connection jig. In FIGS. 1 to 3, members denoted by the same reference numerals as those in FIG. 8 indicate the same or corresponding members.

In FIG. 1, a bent pipe (not shown) is integrally formed at the rear end of the receiving port 2 to form an earthquake-resistant pipe joint 1 of a deformed pipe. A guide groove 1 extending from an opening end 2a to a storage groove 3 is provided in a receiving port 2 of the earthquake-resistant pipe joint 1 of the deformed pipe.
1 is formed. The depth of the guide groove 11 is formed by slightly shaving the inner surface of the innermost peripheral portion of the socket 2, and the depth and width of the guide groove 11 are the plate-like body 13 of the connection jig 12 shown in FIG.
And the depth and width that can pass through.

As shown in FIG. 3, a connection jig 12 used for connecting the above-mentioned earthquake-resistant pipe joint is formed of a wide plate-like body 13 having a curved surface along the inner surface of the receptacle 2 and a plate-like body 13. The guide arm 14 includes a guide arm portion 14 disposed along the guide groove 11 and a grip portion 15 formed outside the guide groove of the guide arm portion 14. The whole is bent and formed from a metal plate such as a steel plate. .

In the figure, reference numeral 14a denotes a hollow portion, which is formed in the guide arm portion 14 for the purpose of weight reduction or the like. Also,
As shown, the plate-like body 13 and the guide arm 14 inserted into the split portion 5a of the lock ring 5 are bent and formed in a bent state, so that the insertion into the split portion 5a is performed reliably. In addition, the grip portion 15 extending to the outside of the receiving port 2 is bent into a hook shape, so that the grip portion 15 can be easily handled at the time of pulling out.

The connecting jig 12 has such a strength that it does not cause buckling or bending deformation due to the reduced elasticity of the lock ring 5 when inserted into the split portion 5a. It is a plate-like body that is as thin as it can exhibit
For example, it is formed of a steel plate or a stainless steel plate having a thickness of about 1 mm. Next, a method of connecting the seismic pipe joint of the deformed pipe will be described.

As shown in FIG. 4, the lock ring centering rubber 4 is stored in the storage groove 3 of the socket 2 and then the lock ring 5
Is stored such that the split portion 5a corresponds to the position of the guide groove 11. Next, as shown in FIG. 5, the split portion 5a is expanded by inserting the magnifier 18 into the split portion 5a of the lock ring 5, and the diameter of the lock ring 5 is increased to be stored in the storage groove 3. As shown in FIG. 1, the plate 13 of the connecting jig 12 of the seismic pipe joint is inserted into the split portion 5 a thus expanded, and the guide arm portion 14 is set along the guide groove 11.

Even if the expander 18 is removed, the split portion 5a is in a locked state while being expanded by the interposition of the plate-like body 13, and the lock ring 5 remains in the storage groove 3.
Further, since the guide arm 14 is housed in the guide groove 11, the guide arm 14 can be reliably extended even if there is no gap between the inner surface of the pipe receiving port 2 and the outer surface of the insertion port 6.

When the insertion protrusion 7 is inserted beyond the lock ring 5 to the inside of the pipe receiving port, the gripper 15 is supported, and the connection jig 12 is pulled out through the guide groove 11. By this pull-out, the split portion 5a becomes the original opening width, the diameter of the lock ring 5 is reduced, and the split ring 5a protrudes from the storage groove 3 in the inner diameter direction and can be engaged with the insertion projection 7. Therefore, the insertion of the insertion port 6 is prevented by the engagement between the insertion port projection 7 and the lock ring 5.

Thereafter, as shown in FIG. 8, a backup ring 8a and a sealing rubber ring 8 are inserted between the inner surface of the receiving port 2 and the outer surface of the insertion port 6, and the pressing ring 9 is set and fastened with the bolt and nut 10. To complete the pipe connection operation. At this time, the guide groove 11 formed on the inner surface of the receiving port is wider than the depth, for example, about 3 mm in depth with respect to the width of 100 mm, and the opening of the receiving port is sealed by the sealing rubber ring 8. Therefore, the leakage due to the provision of the guide groove 11 does not occur.

In the above embodiment, the centering rubber 4 of the lock ring 5 is provided with a plurality of radially thin ribs 4b... 4 on the inner surface of a band-like ring body 4a at circumferential intervals as shown in FIG.
A configuration in which b is erected may be adopted. In this case, the centering rubber 4
In this case, the resistance in the case where the diameter of the lock ring 5 is expanded by the expander 18 or the diameter expansion jig 16 can be reduced.

In the above embodiment, the width of the guide arm 14 of the connecting jig 12 is the same as the width of the wide plate-like body 13. However, as shown in FIG. The shape may be narrowed. In addition, the pipe joints to be targeted in the above-described embodiment can be applied to pipe joints having a structure other than the illustrated one as long as they have a structure that prevents locking by engaging a lock ring and an insertion projection. It is.

[0022]

According to the seismic pipe joint for deformed pipes of the present invention, the jig for expanding the lock ring can be accommodated in the guide groove formed in the inner surface of the socket of the pipe joint. As is often the case, even when there is almost no gap between the inner surface of the receiving port and the outer surface of the insertion port, the diameter of the lock ring can be easily expanded, and the connection work of the seismic pipe joint of the deformed pipe can be performed. It will be easier.

[Brief description of the drawings]

FIG. 1 is a sectional view of an earthquake-resistant pipe joint of a deformed pipe according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a perspective view of a jig for connecting a seismic pipe joint of a deformed pipe.

FIG. 4 is a side sectional view showing a connection state of a seismic pipe joint of a deformed pipe.

FIG. 5 is a front sectional view showing a connection state of a seismic pipe joint of a deformed pipe.

FIG. 6 is a front view of another configuration example of the lock ring centering rubber.

FIG. 7 is a perspective view of another configuration example of a connection jig for a seismic pipe joint of a deformed pipe.

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a sectional view showing a connection state of a conventional earthquake-resistant pipe joint.

FIG. 10 is a front view of a main part showing a connection state of a conventional earthquake-resistant pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Reception port 3 Storage groove 4 Lock ring centering rubber 5 Lock ring 5a Splitting part 6 Insertion opening 11 Guide groove 12 Jig for connecting seismic pipe joint 13 Plate 14 Guide arm part 15 Grip part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuo Kikuchi 2-26, Ohama-cho, Amagasaki-shi, Hyogo F-term in Kubota Mukogawa Works (reference) 3H015 FA03 FA04 FA05

Claims (3)

[Claims] A lock ring receiving groove is formed in an inner surface of a pipe receiving port, a split lock ring is stored in the receiving groove via a centering rubber, and a split portion of the lock ring is widened and a tip is formed. In a seismic pipe joint of a deformed pipe in which an insertion port having a projection is inserted into the reception port, and after the insertion, the lock ring is reduced in diameter to be able to engage with the insertion port projection.
A seismic pipe joint for a deformed pipe, wherein a guide groove extending from an open end to a storage groove of the lock ring is formed on an inner surface of the pipe socket. 2. A centering rubber is stored in a storage groove of a lock ring of a seismic pipe joint for a deformed pipe according to claim 1,
Storing the split lock ring, expanding the split portion by inserting a magnifier into the split portion of the lock ring, expanding the diameter of the lock ring, and storing the entire lock ring in the storage groove, Next, a plate-like body is inserted into the enlarged split portion, the magnifier is removed, and a handle portion of the plate-like body is arranged along a guide groove. When the insertion portion is inserted into the mouth, and the projection of the insertion hole is inserted beyond the lock ring position to the inside of the receiving port, the plate-like body is pulled out through the guide groove, the lock ring is reduced in diameter to the original diameter, and the insertion is performed. A method of connecting a seismic pipe joint of a deformed pipe so that it can be engaged with a mouth projection. 3. A wide plate-like body inserted into a split portion of a lock ring housed in a pipe socket in the deformed pipe seismic pipe joint of claim 1, and the pipe socket extending from the plate-like body. A jig for connecting a seismic pipe joint, comprising: a guide arm portion arranged along a guide groove on an inner surface; and a grip portion formed outside the guide groove of the guide arm portion.