JP2932260B2 - Pipe detachment prevention device for fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a pipe from being detached at a joint where a pipe for underground burial is connected to the pipe with flexibility and elasticity.

[0002]

2. Description of the Related Art As a conventional joint in which a pipe for underground burial is connected to be flexible and extendable, for example, the present applicant has previously described in Japanese Utility Model Application No. 59-151520. The technology shown in FIGS. 8 and 9 and the Japanese Patent Publication No. 53-5144
There is a technique shown in FIG.

[0003] The technology previously filed by the present applicant is a water pipe 1
Attach the annular rubber packing 2 on the outer peripheral surface on the insertion side of
The end of the pipe is fitted into the mouth of the water pipe 3 to maintain water tightness between the water pipes 1 and 3. In this case, water pipe 1
Of the water pipe 3 is set smaller than the inside diameter of the water pipe 3 so that the outer diameter of the water pipe 3 is between the outer peripheral surface of the water pipe 1 and the inner peripheral surface of the water pipe 3. Has a predetermined gap 4 formed therein. The gap 4 is used to allow the joints of the water pipes 1 and 3 to be displaced in the radial direction and to bend within a predetermined range when the soil moves due to running of an automobile, an earthquake, or the like. This is for absorbing and preventing damage to each pipe end of the joint portion.

In such a pipe joint, in addition to having the above-mentioned flexibility, the water pipe 1 must not be detached from the water pipe 3, and a preventive device therefor is required. is necessary. The pipe detachment prevention device filed earlier by the present applicant is:
It is composed of a fastening member 5 and a locking member 6 which are each divided into two parts. A non-slip 7 whose surface is roughened by using a casting surface as shown in FIG. 9 or by machining or the like is formed on the contact surface of the fastener 5 with the water pipe 1. In addition, since the movement of the locking fitting 6 in the leftward direction in FIG. 9 is regulated by the large-diameter portion 8 of the water pipe 3, it is not slip-proof.

[0005] Flanges 9 are formed at both ends of the divided pieces 5a and 5b of the fastening fitting 5 and the divided pieces 6a and 6b of the locking fitting 6, respectively.
Has been concluded. A space 13 for inserting the connecting rod 12 is formed between the opposed flanges 9. Connecting rod 12 inserted into the space 13
Are T-shaped retaining portions 14 for contacting the side end surfaces 9a of the flanges 9 at both ends thereof to prevent the water pipe 1 from falling off.
Are formed.

In such a pipe joint, water pipes 1 and 3
Is flexible as described above. Furthermore,
In this pipe joint, the retaining portion 14 of the connecting rod 12 and the flange 9
The water pipe 1 is extendable and retractable with respect to the water pipe 3 within a dimensional range of play between the water pipe 1 and the side end face 9a. The connecting rod 1
After the retaining portions 14 at both ends of the abutment 2 abut against the flanges 9 of the fastening fittings 5 and the locking fittings 6, the movement of the water pipe 1 thereafter is restrained and the removal is prevented. The flexible angle is usually set to ± 4 degrees in the case of a vinyl chloride tube, and the amount of expansion and contraction is set to 10 mm.

On the other hand, in the prior art disclosed in Japanese Utility Model Publication No. 53-51448, a basic technique is used in which a split fastening member 5 and a locking member 6 are used, and these are connected with a connecting rod 15 so as to be flexible and extendable. In this respect, the present invention is the same as the prior art shown in FIGS. 8 and 9 previously filed by the present applicant. The difference is
The method is a method of connecting the split fastening metal 5 and the locking metal 6 to the connecting rod 15. In the prior art shown in FIG. 10, the divided pieces 5 a and 5 b of
The split pieces 6a and 6b of the latch 6 are connected to each other by a window 16 provided in the connecting rod 15.
And 6b are clamped.
The other end of the connecting rod 15 is connected to the bolt 1 through an elongated hole 17.
Connected to 0. In addition, at the edge of the flanges 9, 9 of the split metal fitting 6, folded pieces 18, 18 for preventing the connecting rod 15 from falling out of the window hole 16 are formed.

[0008]

However, in the prior art shown in FIGS. 8 and 9, the connecting rod 12 is separated from the outer peripheral surface of the water pipe 1 by a dimension L, and the water pipe 1 and the water pipe 3 are not connected.
When a separating force in the pipe axis direction due to a high water pressure is applied to the clamping fitting 5, a bending moment is generated due to the dimension L. That is, when a detaching force acts between the water pipe 1 and the water pipe 3, since the fastening fitting 5 is fixed to the outer peripheral surface of the water pipe 1, it operates integrally with the water pipe 1 to the left in FIG. (In the direction of the arrow A). On the other hand, in the disengagement prevention device, since the connecting rod 12 comes into contact with the fastening fitting 5 and the locking fitting 6 to prevent subsequent detachment, the fastening fitting 5 and the connecting rod 12 come into contact with each other. At the portion, a reaction force in the rightward direction (arrow B direction) in FIG. As described above, a force in the opposite direction acts on the fastener 5 at a position separated by the dimension L, and as a result, a bending moment for deforming the fastener 5 is generated.

For this reason, the connecting rod 12 tends to deviate outward from the split fastener 5 or the flange 9
Since the width dimension of the portion in contact with the connecting rod 12 is small by the U-shaped groove, this causes deformation of the connecting rod 12, and when deformed, the connecting rod 12 may come off from the fastening fitting 5,
Tightening failure due to deformation, water pipe 1 becomes water pipe 3
There was a problem that deviated from. The problem caused by the bending moment is the same in the case of the conventional technique shown in FIG.

The dimension L is determined by the water pipe 1 and the water pipe 3
Since it is necessary to maintain the watertightness by interposing the packing 2, the outer diameter of the portion of the packing 2 of the water pipe 3 swells and becomes large, and the connecting rods 12 and 15 must avoid this. However, the dimension L was inevitably increased. Therefore, the conventional force for preventing the separating force between the water pipes 1 and 3 could only withstand a water pressure as low as ²⁰ kgf / cm ² .

In the prior art shown in FIG. 10, when the water pipe 1 and the water pipe 3 are separated from each other in the axial direction by water pressure, each of the divided pieces 6a and 6b
Since there is a gap between the flanges 9, 9, the divided pieces 6 a and 6 b around the flanges 9, 9 are formed in a V-shape when viewed from the side shown in FIG. There is a disadvantage that the water pipe 3 is bent, and a part of the annular edge portion (edge) locally penetrates into a tapered surface portion where the diameter of the water pipe 3 becomes large, and the stress is concentrated on the portion, thereby damaging the water pipe 3. there were. In particular, when the water pipe 3 is a pipe made of vinyl chloride, there has been a problem that a low-temperature damage is caused.

Further, in any of the above-mentioned conventional devices, when the locking fitting 6 is temporarily attached to the water pipe 3, the divided piece 6a
And 6b must be gripped by hand, and the connecting rods 12, 15 must be mounted in that state, which makes the operation difficult and complicated.

[0013]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems and has been improved and eliminated. The present invention does not generate a bending moment, has a detachment preventing force even at a high water pressure, and has assembling capability. The purpose of the present invention is to provide an easy pipe detachment prevention device.

[0014] In order to solve the above-mentioned problem, the present invention employs one of the joints in which the pipes are connected to each other in a flexible and stretchable manner. A two-part clamp that is tightened with bolts and nuts on the outer peripheral surface of the pipe, and a split piece on the outer peripheral surface of the other pipe
And bisected anchor fitting is arranged engages consists of a connecting rod for connecting the fastening bracket and the locking bracket, the clamping
Brackets are attached to both ends of the two parts by bolts for fastening bolts.
The flanges are formed horizontally facing each other, and the connecting rod has a large-diameter portion disposed in parallel and close to the outer peripheral surface on the receiving side of the joint portion, and from the portion to the inner diameter side. It has a bent portion and a small-diameter portion disposed in parallel and closely adjacent to the outer peripheral surface on the insertion-side side, and the small-diameter portion is fastened by the tightening.
Position between the flanges at both ends of the bracket.
A pipe separation preventing device for a pipe joint, which is disposed closer to the inner diameter than the bolt .

According to this, the connecting rods are arranged in a state of being close to the outer peripheral surfaces of the pipe and the pipe, respectively, and when a separating force in the pipe axis direction due to water pressure acts between the pipes. However, a large bending moment does not occur at the connecting portion between the connecting rod and the fastener, and for example, 40 kgf /
Even if the water pressure is as high as cm ^2, it works to prevent the tubes from coming off.

According to the above-mentioned fastener, the connecting rod is
Since the pipe is disposed closer to the inner diameter than the pipe, the detachment force acting on the pipes can be received by the entire width of the clamp, and the pipe is not easily deformed.

Further, according to the above-mentioned locking metal fitting, a flange portion opposing the two divided end portions is formed in a vertical shape, and one side of the flange portion has a convex portion which comes into contact with the end face of the other flange portion. In addition to the support portion being formed, a groove for connecting rod insertion is formed in an intermediate portion between the flange portions, and a locking projection projecting obliquely rearward is formed outside each flange portion. since it is, by engaging the respective convex bearing portions each other of the split pieces of the locking bracket,
Temporary mounting is possible without holding by hand.

Further, according to the third aspect of the present invention,
The connecting rod has a T-shaped stopper at both ends thereof for engaging with the flanges of the fastener and the fastener. Also, a projection is formed at a position closer to the fastening fitting side of a predetermined dimension to prevent the locking fitting from coming out of the groove. for that reason,
By making the distance between the retaining part and the projection smaller than the dimension of the locking projection of the locking fitting, mounting from an oblique rear is possible, but the connecting rod is parallel to the pipe by following the pipe. In this state, it will not come off from the latch.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to an embodiment shown in the drawings. The same reference numerals as those in the conventional case denote the same members. 1 to 6 relate to a first embodiment of the present invention.
(A) is a partial cross-sectional plan view showing a state after the fastening fitting 19, the locking fitting 20, and the connecting rod 21 are mounted, FIG. 2 (B) is a side view thereof, and FIG. It is a front view showing the state after wearing, and Drawing (B) is the same rear view. FIG. 3 (A)
(F) are a front view, a plan view, a bottom view, a left side view, and a right side view, respectively, showing one of the divided pieces of the locking fitting 20. FIG. 4 is a perspective view showing a pair of divided pieces of the locking fitting 20. FIGS. 5A to 5D are a front view, a plan view, a left side view, and a right side view of the locking fitting 20. FIG. 6A is a plan view for explaining how to assemble the divided pieces 20a and 20b of the locking fitting 20, and FIG.
FIG. 9 is a plan view for explaining how to assemble the connecting rod 21 with the connecting rod 21.

As shown in FIG. 1, the fastening member 19 according to this embodiment has two half-divided pieces 19a and 19a.
b. The divided pieces 19a and 19b are exactly the same components. Horizontal flanges 9, 9 are formed at these ends, and are fastened via T-bolts 22 and nuts 23. Thus, in the fastener 19, the small diameter portion 21 c of the connecting rod 21 is inserted through the space 24 between the T-bolt 22 and the water pipe 1. That is, the connecting rod 21 is the T bolt 2
It is designed to be mounted closer to the inner diameter than 2.

The latch 20 is also composed of two half-pieces 20a and 20b.
And 20b are identical components. Each split piece 20a
And 20b are as shown in detail in the parts diagram of FIG. 3 and the perspective view of FIG. 4. At both ends thereof, vertical flanges 25a and 25b are formed. In addition, the flange 25a has a thickness corresponding to half of the rear side of the front and rear widths of the divided pieces 20a and 20b, and the flange 25b has a thickness equivalent to half of the front side similarly. . Further, the split pieces 20 are provided on the upper and lower end faces of the flange 25a.
counterpart flange 25b when a and 20b are assembled
The protruding support portions 26a and 26b that can abut the upper and lower end surfaces of the are formed to protrude. Further, a groove 27 for mounting the connecting rod 21 is formed in an intermediate portion between these flanges 25a and 25b. Further, a locking projection 28 projecting obliquely rearward is formed protruding outward on the rear side of the flange 25a.

On the other hand, the connecting rod 21 has T-shaped retaining portions 29, 29 formed at both ends thereof, and the portion disposed along the outer peripheral surface of the receiving portion of the water pipe 3 has a large diameter. A bent portion 21b is formed at a portion corresponding to the outer peripheral surface of the water pipe 1 beyond the pipe end of the water pipe 3 and is formed along the outer peripheral surface of the water pipe 1. A small diameter portion 21c is formed in the provided portion. Also, the large diameter portion 21
A protrusion 30 for retaining is formed at a position deviated by a predetermined dimension X from the retaining portion 29 of FIG. This dimension X
In order to prevent the connecting rod 21 from being detached after being attached to the locking fitting 20, each of the divided pieces 20a and 20
b is smaller than the maximum width dimension Y of the portion of the locking projection 28,
In addition, the width dimension Z of the portion excluding the locking projection 28 is set to be larger. That is, there is a relationship of Y>X> Z.
Further, X is the dimension of Z (the convex support portion 2 of the flange 25a).
6a) and the thickness of the flange 25b.

Next, a description will be given of the assembling procedure and the manner of use of the pipe detachment prevention device for a pipe joint thus configured. Assembling of the pipe detachment prevention device is performed after inserting the insertion port of the water pipe 1 into the receiving port of the water pipe 3 via the packing 2. First, as shown in FIG.
Each of the divided pieces 20a and 20b is disposed from above and below the water pipe 3, and each of the flanges 25 of the two divided pieces 20a and 20b.
a and 25a are set obliquely so as to face rearward (rightward in the figure). Then, the two divided pieces 20a and 2
0b in the direction perpendicular to the water pipe 3 and the flange 25
The upper and lower convex support portions 26a and 26b of the a and 25a are brought into contact with and engaged with the upper and lower end surfaces of the opposed flanges 25b and 25b, and are brought closer to the tapered surface portion where the diameter of the water pipe 3 increases. In this engaged state, as shown in FIG.
Since the a and 25a hold the other flanges 25b and 25b in a so-called manner, and are in contact with the tapered surface of the water pipe 3, the two split pieces 20a and 20b do not fall off. That is, it is possible to temporarily attach the locking fitting 20 to the outer peripheral surface of the water pipe 3.

After that, the connecting rod 21 is prepared and attached to the locking fitting 20 in an oblique state as shown in FIG. 6B. Attachment is performed by inserting the large-diameter portion 21a of the connecting rod 21 into the groove 27 of each of the divided pieces 20a and 20b of the locking fitting 20, and at the same time, engaging the locking projection 20 between the retaining part 29 and the projection 30. The section 28 is guided for insertion. Then, as shown by the arrow in the figure, the entire connecting rod 21 is rotated so as to be parallel to the pipe axis. After being parallel to the tube axis, the dimension X between the retaining portion 29 and the projection 30 is determined by the locking projection 28 of the locking fitting 20.
Is set smaller than the maximum width Y of the portion, the connecting rod 21 does not easily fall off.

As described above, the divided piece 20a of the locking member 20
And 20b are not dropped off without being gripped by hand. In addition, the locking bracket 20
After the connecting rod 21 is set on the connecting rod 21, the connecting rod 21 does not fall off from the locking fitting 20. Therefore, these mounting operations are extremely simple, and the connecting rods 21,
It is also possible to set 21 simultaneously with the left and right hands.

After that, the fastening fitting 19 is assembled. First, the divided piece 1 of the fastener 19 is located below the water pipe 1.
9b, and the small diameter portions 21c, 21 of the connecting rods 21, 21 are arranged.
c is placed on the flanges 9 at both ends of the divided piece 19b. Then, the split piece 19a of the fastener 19 is placed on the upper side of the water pipe 1, and the flanges 9, 9 of the upper and lower split pieces 19a and 19b may be fastened with the T bolt 22 and the nut 23. At this time, the T bolt 22 and the nut 23
Can be easily mounted from the lateral direction via a U-shaped groove between the flanges 9, 9 in a state where they are assembled in advance. Thus, the small diameter portion 21c of the connecting rod 21 is located between the T bolt 22 and the outer peripheral surface of the water pipe 1.

As a result, the connecting rod 21 is disposed along and adjacent to the outer peripheral surfaces of the water pipe 3 and the water pipe 1. In particular, the small diameter portion 21c is far from the water pipe 1. Therefore, even when a force in the detaching direction due to water pressure acts between the water pipe 1 and the water pipe 3, the water pipe 1 and the connecting rod 21 act in opposite directions acting on the fastener 19. Since the force is generated within a very close dimension, no large bending moment is generated in the clamp 19 to deform it. That is, the connecting rod 2
There is no force acting on the first fitting 1 to detach from the fastening fitting 19. In addition, since the small diameter portion 21c of the connecting rod 21 is disposed close to the water pipe 1, the above-described detachment force can be covered by the entire width dimension of the fastener 19, and the fastener 19 is easily deformed. Nothing to do.

Further, in the locking fitting 20, the detaching force is applied to the retaining portion 29 of the connecting rod 21 and each of the divided pieces 20a and 20a.
0b is transmitted by contact with the vertical flanges 25a, 25a, and the two pieces 20a and 20b are pulled in the same direction.
Also, a and 20b are not deformed into a V shape. That is, the flanges 25a and 25b of the divided pieces 20a and 20b
Are vertically divided and located at the front and rear, and receive a separating force between the pipes in a state where the entire surface of the flange 25a is in contact with the connecting rod 21, so that the split pieces 20a and 20b are deformed into a U-shape. It will not be done. For reference, in the conventional one, the flanges 9, 9 of the divided pieces 6a and 6b are divided into upper and lower parts, and a separating force by the connecting rods 12, 15 acts on both upper and lower flanges 9, 9. Because of this, the divided pieces were deformed into a shape of a letter.

FIG. 7 shows a second embodiment of the present invention. FIG. 7A shows a fastening fitting 19 and a locking fitting 20.
And a partial cross-sectional plan view showing a state after mounting of the connecting rod 21;
FIG. (B) is a side view of the same. As shown in the figure, in this embodiment, the divided pieces 19a and 19b
Box portions 31a,
31b. The other configuration and operation and effect are the same as those of the above-described first embodiment.

[0030]

As described above, the technique of the present invention is divided into a two-part clamp which is clamped on the outer peripheral surface of one tube and a two-part clamp which is clamped on the outer peripheral surface of the other tube. A locking fitting, and a connecting rod for connecting the fastening fitting and the locking fitting, wherein the connecting rod is arranged in parallel along the outer peripheral surface on the receiving side of the joint portion. It has a large-diameter portion provided, a portion bent from the portion toward the inner diameter side, and a small-diameter portion provided in parallel along the outer peripheral surface on the insertion side. For this reason, the connecting rods are disposed close to the outer peripheral surfaces of the pipes and the pipes, respectively, so that even if a separating force in the pipe axis direction due to water pressure acts between the pipes, the connecting rods are connected.
The connecting portion between the binding rod and the clamping bracket does not occur large deal of bending moment. Therefore, for example, 40 kgf / c
Even with a water pressure as high as m ^2, it is possible to prevent detachment of the tubes without damaging the tubes.

Also, the detaching force acting on the locking member via the connecting rod is transmitted to the vertical flange of one of the divided portions of the locking member by coming into contact therewith. Are pulled in the same direction, so that the divided pieces do not deform into a V shape between the divided pieces.

Further, after assembling the split pieces of the locking metal, the lower split piece does not fall off even after the hands are released, and the connecting rod is attached to the locking metal. After this, the connecting rod itself does not fall off. Therefore, the assembling work becomes extremely simple, and the left and right connecting rods can be simultaneously attached with both hands.

Further, since the connecting rod is disposed between the tightening bolt and the pipe, a separating force acting between the connecting rod and the tightening fitting can be received in the entire width of the tightening fitting. It is possible to form the mounting portion of the tightening bolt located on the outside thereof into a U-shaped groove. Therefore, even if the fastening bolt and the nut are not separated, they can be mounted on the fastening fitting, and the pipe joint work can be performed quickly.

[Brief description of the drawings]

FIG. 1 relates to a first embodiment of the present invention,
FIG. 1A is a partial cross-sectional plan view showing a state after mounting, and FIG. 1B is a side view of the same.

FIG. 2 relates to the first embodiment of the present invention,
(A) is a front view showing a state after mounting, and (B) is a rear view of the same.

FIG. 3 relates to the first embodiment of the present invention,
(A) is a front view, (B) is a plan view, (C) is a bottom view, (D) is a left side view, and (E) is a right side view.

FIG. 4 is a perspective view of a lock according to the first embodiment of the present invention.

FIGS. 5A and 5B show a lock fitting according to the first embodiment of the present invention, wherein FIG. 5A is a front view, FIG.
FIG. (C) is a left side view, and FIG. (D) is a right side view.

FIG. 6 relates to the first embodiment of the present invention,
FIG. (A) is a plan view for explaining an assembling procedure of the locking fitting and the split piece, and FIG. (B) is a plan view for explaining an assembling procedure of the locking fitting and the connecting rod.

FIG. 7 relates to a second embodiment of the present invention,
FIG. 1A is a partial cross-sectional plan view showing a state after mounting, and FIG. 1B is a side view of the same.

FIG. 8 is a perspective view showing a conventional pipe separation prevention device.

FIG. 9 is a semi-longitudinal sectional view showing a conventional pipe detachment prevention device.

10 (A) is a longitudinal sectional view, FIG. 10 (B) is a side view, and FIG. 10 (C)
Is a longitudinal sectional front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Water pipe 2 ... Rubber packing 3 ... Water pipe 4 ... Space 19 ... Clamping fitting 19a, 19b ... Split piece of fastening fitting 20 ... Locking piece 20a, 20b ... Locking piece split piece 21 ... Connecting rod 21a ... Large-diameter portion of the connecting rod 21b ... Bend portion of the connecting rod 21c ... Small-diameter portion of the connecting rod 22 ... T-bolt 23 ... Nut 25a, 25b ... Flange 26a, 26b of locking fitting 26a, 26b ... ... locking projection 29 ... retaining part 30 ... projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-280152 (JP, A) JP-A-7-12276 (JP, A) JP-A 8-326969 (JP, A) JP-A 9-92 280441 (JP, A) Fully open sho 61-66290 (JP, U) Fully open sho 60-71787 (JP, U) Fully open sho 50-110818 (JP, U) Fully open sho 52-100223 (JP, U) Actual opening Hei 7-16091 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16L 21/08 F16L 1/024

Claims (3)

(57) [Claims] 1. A tube and in and telescopically connected joint portion and is with a flexible tube, ball on the outer peripheral surface of one pipe
Two-part tightening bracket that is tightened with a bolt and nut ,
The divided pieces are arranged on the outer peripheral surface of the other pipe so as to engage with each other.
That the bisected anchor fitting comprises a connecting rod for connecting the fastening bracket and the locking bracket, bracket the tightening is bisected
Bolt fastening flanges face opposite ends
The connecting rod is formed in a horizontal shape, and the connecting rod has a large-diameter portion disposed close to and parallel to the outer peripheral surface on the receiving side of the joint portion, and a portion bent from the portion to the inner diameter side. And a small-diameter portion disposed closely and in parallel along the outer peripheral surface on the insertion side, and the small-diameter portion is divided into two parts of the fastening fitting.
Between the flanges at both ends
A pipe separation preventing device for a pipe joint, wherein the pipe is also disposed near the inner diameter . 2. An engaging metal fitting according to claim 1, wherein a flange portion opposing the two divided end portions is formed vertically, and one side of said flange portion has a convex support portion abutting on an end face of the other flange portion. Are formed, a groove for connecting rod insertion is formed in the middle part between the flange parts, and a locking convex part projecting obliquely rearward is formed on the outer side of each flange part. The pipe detachment prevention device for a pipe joint according to claim 1, characterized in that: 3. The connecting rod has a T-shaped stopper formed on both ends thereof for engaging with the flanges of the fastening member and the locking member. 2. The pipe for a pipe joint according to claim 1, wherein a projection is formed at a position closer to the fastener with a predetermined dimension than the portion to prevent the locking metal from coming out of the groove. Detachment prevention device.