JP7112545B2 - Flexible joint structure and seismic repair valve - Google Patents

Description

The present invention relates to an expansion and contraction flexible joint structure and a seismic repair valve having this structure.

In general, repair valves are installed directly under fire hydrants and air valves, and are used to shut off water pressure applied to fire hydrants and air valves from inside the water pipe when performing inspection and repair of fire hydrants and air valves. .

As this type of underground fire hydrant, for example, the one shown in FIG. 23(a) is known. At the location where an underground fire hydrant is installed, a valve chamber 2 that reaches a water pipe 1 buried horizontally in the ground is formed from the ground surface, and inside this valve chamber 2, the water pipe 1 is directed upward. It is constituted by a T-tube 4 with a branch 3 extending into. A repair valve 7 composed of a short pipe 5 and a valve 6 is connected to the upper portion of the T-shaped pipe 4, and a fire hydrant 8 is connected to the upper portion of the repair valve 7. An initial gap 9 is provided between the fire hydrant 8 and the chamber wall 2 a of the valve chamber 2 . The air valve is also constructed in the same manner as the fire hydrant described above, and releases the air in the water pipe to the outside.

When inspecting, servicing or replacing the fire hydrant 8, the water pressure from the water pipe 1 to the fire hydrant 8 can be cut off by closing the valve 6 of the repair valve 7, so the work can be carried out safely without water leakage. can do.

In the Great Hanshin-Awaji Earthquake that occurred in 1995 and the Great East Japan Earthquake that occurred in 2011, there was a lot of damage to water distribution pipes in the disaster areas, as well as fire hydrants, air valves, etc. There has occurred.

As a result of investigating the damage causes and damage mechanisms of fire hydrants and air valves in the event of an earthquake, the direct cause of damage to the flanges and T-shaped pipes, which account for the majority of the damage in air valves and fire hydrants, is the valve body and valve chamber. It is thought that this is due to the reaction force generated by the collision of the chamber walls, etc. Reference titles "Study on improvement of seismic resistance of water pipe accessories (Journal of Water Works Association Vol. 67 No. 3 (No. 762))", "Pipe body and pipe attachment in 2011 (Heisei 23) Great East Japan Earthquake Equipment Damage Investigation Report (Japan Water Works Association)”.

That is, during an earthquake, the amount of displacement of the ground 10 in which the valve chamber 2 is provided and the water pipe 1 are not the same, but are relatively displaced. As a result, as shown in FIG. 23(b), when the initial gap disappears and the chamber wall 2a of the valve chamber 2 and the fire hydrant 8 contact (collide), the displacement of both is restrained. If the relative displacement between the ground 10 and the water pipe 1 continues after that, the fire hydrant 8 receives the reaction force Fr from the chamber wall 2a and tilts as shown in the figure. If the deformation accompanying this tilting exceeds the limit deformation amount, the fire hydrant 8, the flange portion 12 of the repair valve 7, and the T-shaped pipe 4 will be damaged.

Therefore, in order to prevent such underground fire hydrants and air valves from being damaged in the event of an earthquake, it is necessary to attach a flexible joint or the like between the valve plug main body and the T-shaped pipe.

Conventionally, as a joint structure that provides expansion and contraction flexibility to a piping structure, for example, the pipe joint structure of Patent Document 1 is known. This pipe joint structure has a structure that allows the joint part to bend smoothly when a large force acts on the joint part in a direction that bends the joint part. If the ground and water pipe are displaced relative to each other during an earthquake and the valve plug main body and the wall surface of the valve chamber collide, the joint structure will bend. There is a high possibility of avoiding the occurrence of deformation exceeding the limit deformation amount in the valve plug main body and the T-tube.

On the other hand, Japanese Unexamined Patent Application Publication No. 2002-100001 proposes a rotation-preventing structure for connecting flanges. According to the document, it is a pipe connection structure in which the other insertion pipe portion is inserted into the socket pipe portion of one flow path constituent member and connected via a ring-shaped sealing member, and is formed in the socket pipe portion The flange and the flange formed on the spigot pipe portion are composed of a plurality of split members having concave grooves capable of sandwiching these flanges together, and an endless ring surrounding the outer peripheral surface of the plurality of split members. The strength of the flange portion is ensured by adopting a structure in which it is connected by a member, and both flanges have recesses and protrusions that can be engaged with each other, and these recesses and protrusions are engaged. By aligning both flanges, relative rotation of both flanges can be prevented while both flow path forming members can be arranged at a predetermined angle.

JP-A-2003-214573 JP 2015-183731 A

However, in the pipe joint structure of Patent Document 1, since the portion constituting the telescopic flexible mechanism is arranged long in the pipe axial direction, a joint having this joint structure is used to connect the repair valve and the T-shaped pipe. If the connection is made flexible, the distance between the valve plug main body and the water pipe is increased.

In particular, for underground fire hydrants, the standard (JWWA B 103) stipulates that a cap depth of 150 mm or more should be secured. is deeper than in the past, increasing the cost of laying.
In addition, when trying to make an existing fire hydrant that is shallowly buried (burial depth 600 mm) earthquake resistant by using a joint having the above joint structure, the water pipe must be buried deep enough to ensure a cap depth of 150 mm or more. Since it is necessary to repair, there is a problem that the installation cost is very large and it is extremely difficult to implement.

On the other hand, the pipe connection structure of Patent Document 2 is basically a rigid structure with reinforced strength, and does not have sufficient expansion and contraction flexibility. Since sufficient followability is not exhibited against a large external force, it is impossible to ensure reliable safety against damage or failure of the connection structure. In addition, the anti-rotation structure is excessively strong, and along with this, the operation of locking or releasing the locking of rotation is complicated, resulting in poor workability. Since it is complicated, the productivity and manageability of the product are poor, and it is difficult to adopt it easily. That is, in order to connect both flanges to prevent rotation, at least the work of preparing the ring member, aligning and engaging the concave and convex portions of both flanges, attaching both split members, and rotating the ring member is required. Therefore, it is necessary to perform complicated disconnection/connection work at once. This is even more so when changing the direction in which the spigot tube part-side member is connected to the socket tube part-side member.

Accordingly, the present invention has been developed to solve the above problems, and its object is to provide an expansion and contraction joint structure capable of imparting earthquake resistance to fire hydrants and air valves installed in water pipes. It is therefore an object of the present invention to provide an expansion/contraction joint structure and an earthquake-resistant repair valve that can reliably prevent rotation even in the case of such an expansion/contraction structure.

In order to achieve the above object, the invention according to claim 1 has a receptacle side provided in a piping material and a receptacle member side to which a pressing ring is fixed, and a state in which the receptacle side is fitted to the receptacle member side. An expansion and contraction joint structure in which an expansion and contraction structure is built in an expansion and contraction space formed on the insertion port side and the socket member side, wherein the engaging portion provided on the outside of the insertion port side is the outside of the socket member side The insertion port side is configured to prevent rotation by locking with the locking portion provided in the above, and the engagement margin T in the locked state between the engaging portion and the locking portion and the movement when the removal force acts on the insertion port side are possible. The relationship between the distance t is set as T>t, and the insertion port side is expanded and contracted by the action of the withdrawal force, and even if it is flexible, the engaging part and the locking part cannot be rotated and separated. It is a flexible joint structure.

In the invention according to claim 2, the engaging part is a projecting part, the locking part is an engaging groove formed by a pair of projecting parts, and the projecting part is sandwiched between the engaging grooves. It is a flexible joint structure.

The invention according to claim 3 is an earthquake-resistant repair valve having an expansion and contraction flexible joint structure in which the piping material is a repair valve body provided with a spigot side.

According to the invention of claim 1 or claim 2 , in a state where it is fitted in the receptacle member on the side of the insertion port provided in the piping material, the flexible flexible structure is built in the flexible space therebetween. It is possible to provide earthquake resistance to the piping equipment by using the By providing a stop structure, it is possible to prevent mutual rotation with an extremely simple structure, and even if a strong horizontal rotating force due to tightening force is applied when connecting piping equipment, it will not rotate with respect to the socket member side. The plumbing equipment can be installed while preventing and preventing leakage, and there is no risk of impairing the operability of the plumbing equipment or making the plumbing equipment unusable.
Moreover, since the relationship between the engagement length T in the locked state between the engaging portion and the locking portion and the movable distance t when the removal force acts on the insertion port side is set to T>t, the action of the removal force is set. Also, due to the action of the bending force, the engagement between the engaging portion (protruding portion) and the locking portion (engaging groove) is not disengaged even if the insertion port side moves the maximum distance, and the insertion port side can be rotated. There is an effect such as being prevented.

According to the third aspect of the invention, by using the repair valve body as the piping equipment, a fire hydrant or an air valve can be connected through the repair valve body. By providing a telescopic flexible structure in the telescopic flexible space formed by the side, it is possible to prevent damage to the fire hydrants and air valves by imparting earthquake resistance to these flexible structures.

1 is a longitudinal sectional view of an embodiment of an earthquake-resistant repair valve of the present invention; FIG. FIG. 2 is a drawing for explaining an engagement state between a retainer ring and a cylindrical spacer of the seismic repair valve of FIG. 1; FIG. 4 is a vertical cross-sectional view of the seismic repair valve in a state where an excessive pull-out force acts on the valve body; FIG. 10 is a drawing for explaining the state of engagement between the retainer ring and the spacer when an excessive pull-out force acts on the valve body; FIG. 4 is a vertical cross-sectional view of the seismic repair valve in a state where excessive bending force acts on the valve body; FIG. 5 is a drawing for explaining an engagement state between a retainer ring and a spacer on the side on which an excessive bending force is applied when an excessive bending force is applied to the valve body; FIG. 10 is a drawing for explaining the engagement state of the retainer ring and the spacer on the side opposite to the side on which the excessive bending force acts when an excessive bending force acts on the valve body. It is drawing explaining the assembly method of the main body and the short pipe which attached the set of parts. FIG. 4 is a longitudinal sectional view of another embodiment of the seismic repair valve of the present invention; 1 is a drawing showing a state in which an embodiment of a joint having an expansion and contraction flexible joint structure of the present invention is arranged between a repair valve and a T-shaped pipe; (a) is a drawing for explaining a normal engagement state when another spacer is used in FIG. and (c) is a drawing for explaining the engagement state when a further excessive pull-out force acts in (b). 1 is a longitudinal sectional view of an embodiment of a detent structure for an earthquake-resistant repair valve of the present invention; FIG. FIG. 13 is a partial cross-sectional view taken along line AA in FIG. 12; It is explanatory drawing explaining the procedure of attachment or detachment of a latching|locking part. FIG. 4 is a longitudinal sectional view of another embodiment of the anti-rotation structure of the earthquake-resistant repair valve of the present invention; FIG. 16 is a partial cross-sectional view taken along line BB in FIG. 15; FIG. 4 is a longitudinal sectional view of another example of the anti-rotation structure of the earthquake-resistant repair valve of the present invention; FIG. 18 is a partial cross-sectional view taken along line CC in FIG. 17; FIG. 4 is a longitudinal sectional view of another example of the anti-rotation structure of the earthquake-resistant repair valve of the present invention; FIG. 20 is a partial cross-sectional view taken along line DD in FIG. 19; FIG. 4 is a longitudinal sectional view of another example of the anti-rotation structure of the earthquake-resistant repair valve of the present invention; FIG. 22 is a partial cross-sectional view taken along line EE in FIG. 21; (a) is drawing explaining the structure of the conventional underground fire hydrant. (b) is drawing explaining the situation where the conventional underground fire hydrant collides with the chamber wall of a valve chamber at the time of an earthquake. It is plane explanatory drawing which shows the state which the mouthpiece of the fire hydrant and the room wall interfered.

The expansion and contraction joint structure of the present invention can be applied to various types of piping equipment, but in the following description, an example of an embodiment in which the expansion and contraction joint of the present invention is applied to an earthquake-resistant repair valve will be described in detail with reference to the drawings. to explain.

1-8 show an example of a seismic repair valve. FIG. 1 is a vertical cross-sectional view of the seismic repair valve of this embodiment, FIG. 2 is an enlarged view showing an example of the state of engagement between the retainer ring and the spacer at this time, and FIG. 11 is another example of the spacer. is an enlarged cross-sectional view showing an engaged state using the .

In FIG. 1, the seismic repair valve 21 comprises at least a valve body 22, a press ring 23, and a socket member 24. As shown in FIG.

First, the configuration of the valve body 22 will be described. The valve body 22 is composed of a ball valve 25 , an insertion port 27 provided on the primary side of a body 26 of this valve, a retainer ring 28 , a spacer 29 , a backup ring 30 , a rubber ring 31 and a rubber cover 32 .

The ball valve 25 accommodates a ball 35 in a body 26, and is used when the ball 35 is accommodated in the body 26. A valve seat receiver 37 is screwed into an opening 36 provided in the upper portion of the body 26. there is A ball 35 housed within the body 26 is rotatable via a stem 39 by an external handle 38 to open or close the channel 40 . A projection 41 for mounting the rubber cover 32 is provided on the outer periphery of the side surface of the body 26 .

The insertion port 27 is provided by extending the primary side of the body 26 of the ball valve 25, and the outer peripheral surface 43 thereof is formed with a circumferential outer peripheral groove 44 centered on the channel axis. . The outer peripheral groove 44 is provided with a width W1 in which the spacer 29 can be mounted.

The retainer ring 28 is made of metal and, as shown in FIG. It is formed to have an inverted L-shaped cross-section with a protrusion 48 protruding on the inner diameter side of the upper end. A circular arc portion 49 is formed at the tip of the ridge portion 48, the width W2 of the ridge portion 48 is smaller than the width W1 of the outer peripheral groove 44, and the inner diameter D2 of the ridge portion 48 is larger than the outer diameter of the insertion port 27. , and larger than the diameter of the inner bottom portion 53 of the outer peripheral groove 44 .

Since the retainer ring 28 is formed as described above, when the retainer ring 28 is inserted into the outer peripheral groove 44, as shown in FIG. A stretchable and flexible space 56 of the ridge portion 48 is formed between the . In addition, since the inner diameter D1 of the retainer ring 28 is larger than the outer diameter of the insertion port 27 and the height H1 is larger than the width W1 of the outer peripheral groove 44, the surface 58 (lower surface) that presses the rubber ring 31 does not interfere with the outer peripheral groove 44 provided on the outer peripheral surface 43 of the insertion port 27. - 特許庁
The retaining ring 28 is formed as a split ring (not shown) so that it can be inserted into the outer peripheral groove 44, and is combined with a stepped portion 73 formed on the pressing ring 23, which will be described later, to retain the ring shape. be able to.

The spacer 29 is made of metal or synthetic resin. In this embodiment, as shown in FIG. The outer diameter D3 of the large diameter portion 60 of the spacer 29 is larger than the inner diameter D2 of the protrusion 48 of the retainer ring 28, and the outer diameter D4 of the small diameter portion 61 is the inner diameter of the protrusion 48 of the retainer ring 28. The height H2 is smaller than D2, and the width W1 of the outer peripheral groove 44 is substantially the same as the height H2. In addition, the spacer 29 is formed by dividing it into two or by bias-cutting so that it can be attached to the inner bottom portion 53 of the outer peripheral groove 44 .

As shown in FIG. 2, the arcuate surface 62 of the spacer 29 attached to the inner bottom portion 53 of the outer peripheral groove 44 is locked by the arcuate portion 49 formed at the tip of the protrusion 48 of the retainer ring 28. However, as described above, since the height H2 of the spacer 29 is substantially the same as the width W1 of the outer peripheral groove 44, the spacer 29 does not move within the outer peripheral groove 44, and this engagement state is maintained. .

When an excessive pull-out force acts on the insertion port 27 , the force is transmitted from the wall 66 of the outer peripheral groove 44 to the spacer 29 , and the circular arc surface 62 of the spacer 29 is formed in the arc formed at the tip of the protrusion 48 of the retaining ring 28 . Although the portion 49 is pressed, since the retainer ring 28 is locked by the pressing ring 23, the detachment force is applied exclusively to the large diameter portion 60 of the spacer 29, which has the weakest strength among these parts. The reaction force from the tip of the protrusion 48 acts to deform (reduce the diameter). As a result, the large-diameter portion 60 of the spacer 29 is deformed and reduced in diameter, and the engagement between the spacer 29 and the retainer ring 28 is released. It will move until it comes into contact with the ridge portion 48 of the ring 28 .

The role of the spacer 29 is to prevent the insertion opening 27 from slipping out by maintaining the state of being locked by the protrusion 48 of the retaining ring 28 when normal force is applied to the insertion opening 27, and to prevent the insertion opening from being pulled out. When an excessive pull-out force is applied to the port 27, the retaining ring 28 is deformed by the reaction force from the protrusion 48, and the engagement state of the retaining ring 28 with the protrusion 48 is released. The purpose is to make the opening 27 movable in the withdrawal direction. Therefore, the shape of the spacer 29 is not limited to the shape of this embodiment as long as it can fulfill this role. In addition to the shape of this embodiment, for example, as shown in FIG. The flange (rectangular cross-section convex portion 84) that can be engaged with is provided continuously or intermittently, and this engagement state is maintained in a state where normal force is acting, but excessive disengagement When a force is applied, the force received from the protrusion 48 of the retainer ring 28 may break or crush the flange (the projection 84 having a rectangular cross section) to release the engaged state.

FIG. 11(a) is an enlarged cross-sectional view of another example of the spacer 83 used in the engaged state shown in FIG. As shown in FIG. 11A, the spacer 83 of this other example has a cross-sectional rectangular shape with a height that can be engaged with the ridge portion 48 via stepped portions 84a and 84b on a part of the inner peripheral surface side. The convex portion 84 is formed, and the width of the cylindrical surface portion 85a that comes into contact with the ridge portion 48 is substantially the same as the width W2 of the ridge portion 48 described above. 2, the stepped portion 84a of the spacer 83 is engaged with the tip portion (arc portion 49) of the projection portion 48, and the height of the spacer 83 is equal to the width W1 of the outer peripheral groove 44. Since they are substantially the same, the spacer 83 does not move within the outer peripheral groove 44, so the engaged state shown in FIG. 11(a) is maintained. In the spacer 83 of this other example, the stepped portion 84a of the convex portion 84 having a rectangular cross section locks and holds the tip of the projection 48, so that the effect of locking and holding the movement of the body 26 in a normal state is extremely high. Good.

The backup ring 30 is made of metal or synthetic resin, and is formed in a disc shape having a circular hole in the center for inserting the insertion port 27 . As shown in FIG. 2, the backup ring 30 is interposed between the retaining ring 28 and the rubber ring 31, and when the pressing ring 23 presses the rubber ring 31 through the retaining ring 28, the compressed rubber ring 31 is This prevents the deformed portion from entering the split portion of the retainer ring 28, which is configured as a split ring.
In addition, since the height H1 of the retainer ring 28 is larger than the width W1 of the outer peripheral groove 44, the backup ring 30 can be Since it is located below the outer peripheral groove 44 , when the push ring 23 presses the rubber ring 31 via the retainer ring 28 , the deformed portion of the compressed rubber ring 31 is pushed toward the outer peripheral groove 44 . Since the movement is blocked and the deformed portion of the compressed rubber ring 31 is prevented from entering the outer peripheral groove 44, it does not affect the elastic space 56 of the retainer ring 28 in the outer peripheral groove 44. do not have.

The rubber ring 31 is formed of a highly elastic rubber material, and is mounted between the outer peripheral surface 43 of the insertion port 27 and the inner peripheral surface 68 of the socket member 24 to provide a gap between the insertion port 27 and the socket member 24. Although the sealing property is maintained, an excessive bending force is applied to the valve body 22 and the insertion port 27 is inclined, and even if the gap at the rubber ring 31 mounting part increases, the outer peripheral surface 43 of the insertion port 27 and the socket member Since it is necessary to reliably maintain the sealing performance with the inner peripheral surface 68 of the rubber ring 31, the rubber ring 31 is molded into a shape that can secure a sufficient crushing amount of rubber.

The rubber cover 32 is made of a highly elastic rubber material and is formed into an elastic structure, for example, a bellows structure. It is molded in a structure that can reliably follow the valve body 22 and deform even when the valve body 22 is tilted by an excessive bending force.

Next, the push ring 23 will be described. The press ring 23 is made of metal, and as shown in FIG. 1, is formed in a disc shape having an insertion hole 70 in the center for loose fitting with the outer peripheral surface 43 of the insertion port 27 . Further, as shown in FIG. 2, a large-diameter stepped portion 71 is formed around the insertion hole 70 on the upper surface side, and an excessive bending force acts on the valve body 22 at this stepped portion, causing the valve body 22 to tilt. A flexible space 72 is used to prevent the lower portion of the valve body 22 from interfering with the push ring 23 when the valve body 22 is tilted.

In addition to this, a stepped portion 73 capable of accommodating the retaining ring 28 is formed on the lower surface of the push ring 23, and the retaining ring 28 is accommodated in the stepped portion 73 to lock the retaining ring 28. , the rubber ring 31 is pressed through the retainer ring 28 . With such a structure, it is not necessary to use separate parts to lock the retaining ring 28 and to press the rubber ring 31, and the single pressing ring 23 can be used for both. It can be made compact.

The receptacle member 24 is made of metal, and as shown in FIG. 1, it is formed into a short flat shape having an outer diameter equal to the outer diameter of the flange of the T-shaped pipe and a thickness of about 2 to 3 times the thickness of the flange. It is As shown in FIG. 2, a stepped portion 77 capable of accommodating the retainer ring 28 is formed on the inner circumference of the socket 76 of the socket member 24, and a small diameter portion 78 for accommodating the rubber ring 31 is formed below the stepped portion 77. is provided. In addition, an overhanging portion 24a is provided on the inner peripheral side of the lower end of the receptacle member 24 to ensure a contact surface for the gasket when joining with the T-shaped pipe, and an excessive bending force acts on the valve body 22 to prevent the insertion port. Even when 27 is tilted, it is designed to function as a guide for smoothly guiding water flowing from the T-shaped pipe to the inner diameter of the insertion port 27. - 特許庁

When the pressing ring 23 and the receiving member 24 are coupled (fixed) with the bolt 79, the stepped portion 73 formed on the lower surface side of the pressing ring 23 and the stepped portion 77 formed on the inner circumference of the receiving port 76 of the receiving member 24 prevent the member from coming off. A mounting groove 80 containing the ring 28 may be configured.

By incorporating the retainer ring 28 in the mounting groove 80, the retainer ring 28 is locked by the pressing ring 23 securely attached to the receptacle member 24 using the bolt 79 to prevent the insertion port 27 from being detached. In addition, the rubber ring 31 can be firmly pressed via the retainer ring 28, and the outer peripheral surface 43 of the insertion port 27 and the inner peripheral surface 68 of the receptacle member 24 can be sealed watertight.

In addition, since the retainer ring 28 is incorporated in the mounting groove 80 formed by the stepped portion 73 of the pressing ring 23 and the stepped portion 77 of the receptacle member 24, the thickness (height) of the retainer ring 28 is equal to that of the retaining ring 23. It can be built into the dimension of the socket member 24 and contribute to shortening the face-to-face dimension of the seismic repair valve 21 .

Furthermore, since the retaining ring 28 is built in the mounting groove 80 formed by the metal pressing ring 23 and the socket member 24, and the pressing ring 27 presses the rubber ring 31 via the retaining ring 28, the pressing ring 23 and the socket member 24 are configured to press the rubber ring 31 through the retaining ring 28. If the bolt 79 is tightened until the socket member 24 abuts, the rubber ring 31 cannot be pressed by further tightening the bolt 79, so that the rubber ring 31 is not excessively compressed.

Next, the action of the seismic repair valve of the present invention will be described. When the seismic repair valve 21 is normally used, as shown in FIG. 2, the arc surface 62 of the spacer 29 and the arc portion 49 formed at the tip of the protrusion 48 of the retainer ring 28 are in contact with each other. The locked state is maintained and the valve body 22 is stably held against the receptacle member 24 . In this state, as shown in FIG. 1, even if the ball 35 is rotated to the closed position during maintenance and inspection of the fire hydrant and the air valve, the valve body 22 does not allow the fire hydrant and the air valve to move when the ball 35 is in the open position. Since the normal water pressure F1, which is the same as the water pressure acting, is applied, the circular arc surface 62 of the spacer 29 and the circular arc portion 49 formed at the tip of the protrusion 48 of the retainer ring 28 contact and lock. The closed state is maintained, and the valve body 22 is stably held against the receptacle member 24 .

On the other hand, as shown in FIG. 3, when an excessive withdrawal force F2 exceeding a predetermined force acts on the valve body 22, the force acts on the wall 66 of the outer peripheral groove 44 provided on the outer peripheral surface 43 of the insertion port 27. and presses the arc portion 49 formed at the tip of the protrusion 48 of the retainer ring 28 . However, since the retainer ring 28 is locked by the push ring 23, the detachment force is applied exclusively to the large diameter portion 60 of the spacer 29, which has the weakest strength among these parts, and the tip of the protrusion 48 of the retainer ring 28. As shown in FIG. The large diameter portion 60 of is deformed and reduced in diameter. When the diameter of the large-diameter portion 60 of the spacer 29 is reduced, the engagement state between the spacer 29 and the circular arc portion 49 formed at the tip of the protrusion 48 of the retainer ring 28 is released, and the spacer 29 is removed from the retainer ring 28. It becomes possible to pass inside the ridge portion 48 and moves until the wall 66 of the outer peripheral groove 44 comes into contact with the ridge portion 48 of the retainer ring 28 .

At this time, the excessive pull-out force F2 acting on the valve body 22 is transmitted from the wall 66 of the outer peripheral groove 44 provided in the outer peripheral surface 43 of the insertion port 27 to the retaining ring 28 engaged with this wall 66. The retaining ring 28 is pressed by the protrusion 48 , but since the retaining ring 28 is locked by the pressing ring 23 , the force from the receptacle member 24 of the insertion opening 27 engaged with the retaining ring 28 is released. escape is prevented. Further, as shown in FIG. 3, the rubber cover 32 attached between the valve body 26 and the push ring 23 is deformed following the movement of the valve body 22, and the gap between the valve body 26 and the push ring 23 is deformed. to prevent the intrusion of earth and sand, etc.

FIGS. 11(b) and 11(c) show a state in which an excessive pull-out force acts similarly to the above in the engaged state shown in FIG. 11(a). In FIG. 11(b), the projection 84 having a rectangular cross section of the spacer 83 is pressed against the wall 66 of the outer peripheral groove 44 by the reaction force from the tip of the protrusion 48. An example of a state in which the cylindrical surface portion 85b side is crushed by the wall 66 and bent while the shape is maintained without being crushed is shown. Furthermore, FIG. 11(c) shows a state in which an even greater pull-out force than in FIG. 11(b) acts, and as shown in FIG. It was crushed and lost its shape. Note that Table 1, which will be described later, shows an experimental example in which the relationship between the pull-out force and the shape of the spacer 83 of this other example was measured.

Also, when an earthquake occurs, relative displacement occurs between the ground and the water pipe, and the fire hydrant or the air valve collides with the wall of the valve chamber, as shown in FIG. works. In this case, an excessive pull-out force acts on the colliding side, while a compressive force acts on the opposite side. FIG. 6 shows the situation of the retainer ring 28 and the spacer 29 on the side where the excessive pull-out force was applied. 60 is deformed and reduced in diameter, the engagement state between the spacer 29 and the protrusion 48 of the retainer ring 28 is released, and the spacer 29 passes inside the protrusion 48 of the retainer ring 28. is possible, the wall 66 of the outer peripheral groove 44 moves until it comes into contact with the protrusion 48 of the retainer ring 28 . On the other hand, since the pull-out force does not act on the side opposite to the colliding side, the engagement state between the spacer 29 and the protrusion 48 of the retaining ring 28 does not change as shown in FIG. As a result, the valve body 22 is tilted with respect to the receptacle member 24, as shown in FIG.

When an excessive bending force F3 acts on the valve body 22 and the insertion port 27 is tilted, as shown in FIG. 28 while passing through the inner peripheral side of this ridge portion 48 while being reduced in diameter. The resistance when contacting the surface of the spacer 29 is small, and the insertion opening 27 can be smoothly inclined.

Even if the valve body 22 tilts in this way, the large-diameter stepped portion 71 formed around the insertion hole 70 on the upper surface side of the push ring 23 exhibits an effect as a flexible space, so that the lower portion of the valve body 22 and the push ring 23 are No interference. In addition, even if the valve main body 22 is tilted with respect to the socket member 24, the rubber ring 31 is molded into a shape that can secure a sufficient crushing amount of rubber even if the gap at the rubber ring 31 mounting portion increases. Therefore, the sealing performance between the outer peripheral surface 43 of the insertion port 27 and the inner peripheral surface 68 of the receptacle member 24 is not impaired, and watertightness is reliably maintained. In addition, as shown in FIG. 5, the rubber cover 32 attached between the valve body 26 and the push ring 23 deforms following the movement of the valve body 22, and the valve body 26 and the push ring 23 are deformed. To prevent the intrusion of earth and sand, etc.

As described above, in the expansion and contraction joint structure and the seismic repair valve according to the present invention, a simple expansion and contraction joint structure in which the retainer ring 28 is locked and the rubber ring 31 is pressed by a single push ring 23 is provided. In addition, since this expansion and contraction joint structure is built in the pressing ring 23 and the short flat socket member 24 (short pipe), the length in the tube axial direction is reduced compared to the conventional expansion and contraction mechanism. could be significantly shortened. The face-to-face dimension of the seismic repair valve using this expansion flexible joint structure was the same as that of the conventional repair valve. 600 mm), a cap depth of 150 mm or more can be ensured while providing earthquake resistance.

An example of the assembly procedure is shown in FIG. 8, and the assembly procedure of the telescopic flexible portion of the seismic repair valve 21 will be described below.
A rubber cover 32 is attached to the body 26 of the valve, a push ring 23 is fitted to the outer peripheral surface 43 of the insertion port 27, a spacer 29 and a retaining ring 28 are inserted in this order into the outer peripheral groove 44 of the insertion port 27, and the insertion port below it is inserted. A backup ring 30 and a rubber ring 31 are fitted in this order to the outer peripheral surface 43 of 27 and attached.

After the above attachment is completed, insert the insertion port 27 into the receptacle 76 of the receptacle member 24 from the tip side, and push it from the top of the body 26 with a large force Fp such as a press. At this time, the reason why it is necessary to push in with a large force Fp such as a press is that the outer peripheral surface 43 of the insertion port 27 and the inner periphery of the receptacle member 24 are in contact with each other even when the insertion port 27 is tilted due to the bending force acting on the valve body 22 . Since the rubber ring 31 is formed so as to secure a sufficient amount of crushed rubber so as not to impair the sealing performance with the surface 68, the rubber ring 31 is inserted into the small diameter portion 78 of the socket member 24. This is because it requires a great deal of force.

The pressing force when inserting the body 26 with parts such as the retainer ring 28 into the receptacle member 24 is such that when the body 26 is pushed by a press or the like, the outer circumferential groove 44 provided in the insertion port 27 of the body 26 is pushed by the retainer ring. 28 is pushed, and the retaining ring 28 is transmitted to push the backup ring 30 and the rubber ring 31 . At this time, the rubber ring 31 is compressed and deformed. The deformed portion does not enter the divided portion of the retainer ring 28 or the outer peripheral groove 44 provided in the insertion port 27. - 特許庁

After the body 26 with the parts mounted thereon is pushed into the receiving member 24 to a predetermined position, a predetermined torque is applied to fix the push ring 23 and the receiving member 24 with the bolt 79 while applying the pushing force. Assembly is completed. After that, even if the pushing force such as the press is removed, the pressing ring 23 continues to press the rubber ring 31 through the retainer ring 28 due to the tightening force of the bolt 79. The sealing performance with the peripheral surface 68 is not impaired.

Another embodiment of the seismic repair valve according to the present invention is shown in FIG. The parts common to the seismic repair valve 81 of FIG. 9 and the seismic repair valve 21 of FIG. In the seismic repair valve 81 shown in the figure, a socket 76 is provided in a short pipe 82 (a socket member), and the push ring 23 and the short pipe 82 are fixed with bolts 79 .

Next, an embodiment of an expansion and contraction joint using the expansion and contraction joint structure of the present invention will be described. The difference from the earthquake-resistant repair valve mentioned above is that the insertion port is formed on the primary side of the valve body in the earthquake-resistant repair valve. It is a point to configure to Since other structures and functions are the same as those of the seismic repair valve described above, the description is omitted.

FIG. 10 shows an example in which this expansion and contraction flexible joint 85 is installed between the fire hydrant 8 with the repair valve 7 and the T-shaped pipe 4 . In this case, the position of the fire hydrant 8 is higher than when using the seismic repair valve described above. It is possible to make it earthquake resistant after securing it.

As described above, the expansion and contraction joint structure and the seismic repair valve of the present invention are extremely short and compact in length in the direction of the pipe axis and can be expanded and contracted with a simple structure, compared to conventional expansion and contraction flexible joints. Flexible structures can be realized. In particular, in the earthquake-resistant repair valve of the present invention, the face-to-face dimension of the earthquake-resistant repair valve can be matched to the face-to-face dimension of the conventional repair valve (150 mm), so even in the case of shallow burial (covering 600 mm), earthquake resistance can be achieved. It is possible to secure a cap depth of 150 mm or more while keeping the Furthermore, by replacing the existing fire hydrant and air valve repair valves with the seismic repair valve of the present invention, the fire hydrants and air valves can be made earthquake resistant without replacing the T-pipe. In addition, since the expansion and contraction flexible joint structure of the seismic repair valve is assembled in the factory, connection with fire hydrants, air valves, and T-shaped pipes at the site can be done by simply tightening bolts and nuts and connecting flanges as before. No special tools required.
As described above, the expansion and contraction joint structure and the seismic repair valve of the present invention are extremely useful and economical for strengthening the water supply infrastructure.

12 to 22 show examples of anti-rotation structures in the earthquake-resistant repair valve of the present invention, showing states in which the body 26 is anti-rotation locked. The anti-rotation structure of the present invention engages a protruding portion provided on a piping material or a repair valve body and a bolt itself, a locking portion attached to the bolt, or an engaging portion formed on a press ring to lock the piping. It is an expansion and contraction joint structure in which the equipment or the repair valve body is prevented from rotating, and the seismic repair valve. Further, the locking portion is an expansion/contraction flexible joint structure and an earthquake-resistant repair valve which are provided so as to be detachable or detachable along with expansion/contraction by an external force.

As described above, in the present invention, the primary side of the body 26 is connected to the receptacle member 24 (short pipe) via the telescopic flexible structure. When a tool such as a wrench is used to tighten a pipe bolt, etc., a strong horizontal turning force acts on the body 26. In addition, due to the rotation of the body 26, the tightening force of the flange may become insufficient, which may cause leakage or the like. If the body 26 rotates when installing a fire hydrant or an air valve, the position of the handle 38 may be displaced from the predetermined position, which may lead to an unexpected malfunction of use. Alternatively, even when using a fire hydrant connected to the upper part of the body 26 in an emergency, depending on the state of the cap of the fire hydrant, the cap may rotate together with the body 26, making it impossible to open and close the valve.

Therefore, in the present invention, a detent structure is provided so that the body 26 is reliably fixed to the socket member 24 (short pipe) so as not to be rotatable, thereby compensating for the above drawback. As shown in FIGS. 12 to 22, this anti-rotation structure is a structure in which the projecting portion provided on the body 26 is engaged with the bolt 79 or the engaging portion. Therefore, the fire hydrant connected to the upper part of the body 26 can be reliably opened and closed.

FIG. 12 is a cross-sectional view of one embodiment (this example) of the anti-rotation structure of the present invention, and FIG. 13 is an explanatory view taken along line AA in FIG. 12 to 22, the same parts are denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 12, in this example, a tongue-like protruding portion 86 is integrally formed from the body 26 on the bottom portion 26a of the body 26 opposite to the handle 38 as a portion for locking the rotation of the body 26. has been extended. On the other hand, a bolt 88 with a hexagonal hole 88a is used as a bolt for fixing the pressing ring 23 and the socket member 24, and a pin 87 made of resin or metal as a locking portion is attached to the hexagonal hole 88a. It is fitted and attached in a detachable manner. For this reason, as shown in FIG. 13, a recessed arc portion 86a is formed in the projecting portion 86, and the shape of this recessed arc portion 86a matches the shape of the outer peripheral surface of the cylindrical pin 87. They engage with each other, and this engagement locks the horizontal rotation of the body 26 .

14A and 14B are explanatory diagrams illustrating a procedure for locking the repair valve in the anti-rotation structure of the present embodiment in a state where the body 26 is connected to the socket member 24. FIG. When the pin 87 is attached to the bolt 88 for anti-rotation locking, the body 26 is rotatable via the telescopic flexible structure as described above, so by forcibly rotating the body 26, The position of the arcuate concave portion 86a of the projecting portion 86 is aligned with the position of the hexagonal hole 88a, and as shown in FIGS. After that, the cylindrical pin 87 is fitted into the hexagonal hole 88a. In this state, the locking piece 87a provided on the pin 87 is on the opposite side of the projecting portion 86. As shown in FIG. Next, as shown in FIGS. 14(c) and 14(d), the pin 87 is rotated 180 degrees so that the locking piece 87a is positioned between the lower surface of the projecting portion 86 and the upper end surface of the head of the bolt 88. Bite and engage. The pin 87 is fitted into the hexagonal hole 88a, and this engagement reinforces the pin 87 to prevent it from coming off unexpectedly during transportation or installation. Moreover, when releasing this locking, it can be easily released by performing the reverse of the above-mentioned procedure.

15 is a cross-sectional view of another embodiment (another example) of the anti-rotation structure of the present invention, and FIG. 16 is a cross-sectional view taken along line BB in FIG.

In FIG. 15, in this example, as a portion for locking the rotation of the body 26, a projecting portion 89 extends downward from the bonnet 26b, which is a shaft sealing portion for the stem 39 of the body 26. It is integrally extended. On the other hand, the press ring 23 of this another example projects four corners of a portion for fastening the bolt 91 to the receptacle member 24, and the portion 23a between these four corners is as thin as necessary with respect to the flow path 40. 16, the cross section presents a substantially quatrefoil shape as shown in FIG. The socket member 24 is similarly formed, and the push ring 23 and the socket member 24 in the examples shown in FIGS. 12 to 22 are all similarly formed.

In FIG. 16, in this another example, an engagement groove 90 made up of protrusions 90a and 90b is provided in the portion 23a of the pressing ring 23 as a locking portion. The engagement groove 90 is positioned so that the protrusion 89 can be fitted between the two protrusions 90a and 90b when the body 26 is fastened to the push ring 23 with the bolt 91. is formed in Therefore, both sides of the projecting portion 89 are held between the projecting portions 90a and 90b, so that the body 26 is engaged with the engaging groove 90 and prevented from rotating in the horizontal direction. As shown in the figure, only one locking mechanism is provided in this another example.

Further, as shown in FIG. 15, the engagement allowance T between the projecting portion 89 and the engaging groove 90 is determined by the height difference between the upper surface 23b of the pressing ring 23 and the tip (lower end) of the projecting portion 89 in the same figure. On the other hand, the movable distance t when the removal force acts on the body 26 is substantially equal to the distance obtained by subtracting the width W2 of the protrusion 48 from the width W1 of the outer circumferential groove 44 in FIGS . If these are set so that T>t, even if the body 26 moves the maximum distance due to the action of the pull-out force, the engagement between the projecting portion 89 and the engagement groove 90 will not be disengaged. does not rotate. In this alternative structure, the projecting portion 89 is integrally extended from the bonnet 26b, and the engagement groove 90 is integrally formed with the push ring 23. Therefore, a separate member is required as a member constituting the anti-rotation structure. Since it is completely unnecessary, the number of parts does not increase.

Next, FIG. 17 shows another embodiment (another example) of the anti-rotation structure of the present invention. In this other example as well, as a portion for locking the rotation of the body 26, a projecting portion 92 is integrally extended from the body 26 in a tongue-like shape to the bottom portion 26a of the body 26, which is the portion on the opposite side of the handle 38. On the other hand, a bolt 93 with a hexagonal hole is used as a bolt for fixing the pressing ring 23 and the socket member 24 together. FIG. 18 is a cross-sectional view taken along line CC in FIG. 17. As shown in FIG. The shape of the cylindrical outer peripheral surface of the head 93a of 93 is matched and engaged with each other, and this engagement prevents the horizontal rotation of the body 26. In the detent locked state shown in the figure, a cylindrical holding member 94 is interposed between the head 93a and the upper surface 23b of the pressing ring 23 under the neck of the head 93a so that the concave arc portion 92a and the head 93a are engaged. The position is adjusted so that

Next, FIG. 19 also shows another embodiment (another example) of the anti-rotation structure of the present invention. In this other example, as a portion for locking the rotation of the body 26, a projecting portion 95 is integrally extended from the body 26 in a tongue-like shape to the bottom portion 26a of the body 26 on the opposite side of the handle 38. On the other hand, a bolt 97 with a hexagonal hole is used as a bolt for fixing the pressing ring 23 and the receiving member 24, and in the tightened state of the bolt 97, a pipe 96 as a locking portion is attached to and detached from the outer circumference of the head 97a. It is attached by fitting freely. FIG. 20 is an explanatory view taken along the line DD in FIG. The shape of the outer peripheral surface of 96 fits and engages with each other, and this engagement prevents the body 26 from rotating in the horizontal direction.

Finally, FIG. 21 also shows another embodiment (another example) of the anti-rotation structure of the present invention. In this other example as well, a projecting portion 98 is integrally extended from the body 26 in a tongue-like shape to the bottom portion 26a of the body 26 on the opposite side of the handle 38 as a portion for locking the rotation of the body 26. are set up. On the other hand, a bolt 99 with a hexagonal hole 99a is used as a bolt for fixing the pressing ring 23 and the receptacle member 24, and a hexagonal hole bolt 99b as a locking portion is detachably screwed into the hexagonal hole 99a. installed with FIG. 22 is a cross-sectional view taken along line EE in FIG. The shape of the outer peripheral surface of the male thread matches and they fit together, and this fitting prevents the horizontal rotation of the body 26 .

Further, the locking portion of the present invention can be detached as it expands and contracts due to an external force. Specifically, as described above, in the event of an earthquake or the like, the body 26 with a fire hydrant or the like connected to the secondary side is subjected to a bending force (acting such that the body 26 is inclined with respect to the socket member 24). 12 to 14, the fixed state of the pin 87 (FIGS. 12, 13, 14(c)(d)), the projecting portion 86 is displaced relative to the pin 87, and this displacement allows the pin 87 to be pushed out of the hexagonal hole 88a and removed from the bolt 88. 19 to 22, the pipe 96 and the bolt 99b are pushed away from the bolts 97 and 99 by the projecting portion 95 and the projecting portion 98, respectively. Detachment is possible. Therefore, when a large external force such as an earthquake acts, the locking portion is immediately disengaged and the fixation of the body 26 is released.

Further, in another example shown in FIGS. 15 and 16, when the above-mentioned external force acts, the body 26 is moved relative to the receptacle member 24 by setting the engagement margin T smaller than the movable distance t. When it expands and flexes abnormally, the locking of the anti-rotation (engagement between the projecting portion 89 and the engaging groove 90) is easily disengaged, and the repair valve is rotated to move the position of the fire hydrant cap or the repair valve. It is also possible to adjust the position of the cap and the handle of the device away from the chamber wall so that it is easy to use. Further, in such a case, a notch may be formed in the protruding portion 89 so that it can be easily broken and separated from the engaging groove 90 by the action of an excessive external force.

It should be noted that the anti-rotation structure of the present invention can easily change the connection direction of the repair valve. For example, after a large earthquake occurs, a large relative displacement occurs between the ground and the water pipe, and the room wall hits the fire hydrant connected to the repair valve, creating an interference state, and the fire hydrant tilts as shown in FIG. In such an interference state, the mouthpiece of the fire hydrant in particular interferes with the room wall, and there is a risk that the fire hose cannot be attached properly and quickly. Alternatively, the chamber wall may interfere with the cap or handle of the repair valve, making it impossible to open and close the repair valve. However, as shown in FIG. 24, such an interference state can be changed by rotating the connecting direction of each repair valve to which a fire hydrant or the like is attached to the short pipe (water pipe T-shaped pipe) to a position where interference does not occur. And sometimes it can be resolved. Therefore, by reversely utilizing the rotation structure (extendable and flexible structure) of the earthquake-resistant repair valve of the present invention described above, the body 26 is forcibly rotated with respect to the socket member 24, thereby quickly and easily performing the above-described operation. Interference conditions can also be resolved. In such a case, the pin 87 can be very easily fixed to and removed from the bolt 88 by the locking and unlocking procedures of the anti-rotation structure described above with reference to FIG. At the same time, it is possible to easily change the connection direction of the body 26 (in this example, change to any four directions that correspond to the positions of the four corner bolts) simply by attaching and detaching the pin 87 and applying a forced turning force.

Table 1 below shows experimental results for the spacer 83 of another example shown in FIG.

First, the magnitude of the pull-out force of 7.8 kN corresponds to the maximum water pressure of 1.75 MPa (valve pressure resistance test pressure) during normal use of the seismic repair valve 21 . The state of the spacer 83 in this case is shown in FIG. 11(a), and the performance required for the spacer 83 in this case is that it should not be deformed. I was able to confirm that.

On the other hand, the magnitude of the escape force is greater than 23.2 kN (equivalent to water pressure 5.25 MPa, which is a safety factor of 3 against the maximum water pressure during normal use), and in the range of 225 (3D) kN or less The performance required for the spacer 83 is that it deforms, and that the position of the body 26 moves in the withdrawal direction along with this deformation. 225 (3D) kN is the pull-out force specified by JWWA B120, 3D is the value of 3×D (nominal diameter), and 3D=3×75=225.

On the other hand, FIG. 11(b) shows an experimental example of the state of the spacer 83 at an escape force of 42 kN (a safety factor of 5.3 with respect to the maximum water pressure during normal use), which is within the range where deformation is required. As shown in the figure, while the shape of the convex portion 84 having a rectangular cross section is maintained, the cylindrical surface portion 85b on the lower side is bent and partially crushed by the wall 66. Since the position of the body 26 (insertion opening 27) also slightly moves in the withdrawal direction along with the deformation, it was confirmed that the required level was satisfied.

Similarly, FIG. 11(c) shows an experimental example of the state of the spacer 83 at a withdrawal force of 225 kN, which is the maximum range required for deformation. Along with the movement, the projection 84 having a rectangular cross section is pushed to the limit toward the wall 66 while the tip of the projection 48 is engaged with the stepped portion 84a. The shape of 84 disappeared completely as if it were crushed by the ridge portion 48, and the ridge portion 48 and the wall 66 were closely engaged through the remnants of the deformed spacer 83. As shown in FIG. Therefore, it was confirmed that the required level was satisfied in this case as well.

21 81 Earthquake-resistant repair valve 22 Valve main body 23 Push ring 24 Receptacle member 27 Insertion port 28 Retaining ring 29 83 Spacer 30 Backup ring 31 Rubber ring 32 Rubber cover 44 Wide groove 48 Projection 56 Telescopic flexible space 71 Large diameter stepped portion 72 Flexible space 79 88 91 93 97 99 Bolt 86 89 92 95 98 Protruding portion 87 96 99b Locking portion 90 Engaging groove

Claims (3)

It has a receptacle side provided in the piping material and a receptacle member side to which a press ring is fixed, and is formed by the receptacle side and the receptacle member side in a state where the receptacle side is fitted in the receptacle member side. An expansion /contraction joint structure in which an expansion/contraction structure is built in an expansion/contraction space, wherein an engaging portion provided on the outside of the insertion opening is engaged with a locking portion provided on the outside of the receptacle member. and the insertion port side has a detent structure, and the relationship between the engagement allowance T in the locked state between the engaging portion and the locking portion and the movable distance t when the removal force acts on the insertion port side. is set to T>t, and even if the insertion port side expands and contracts due to the action of the withdrawal force and is flexible, the engaging portion and the locking portion cannot be rotated and separated. expansion flexible joint structure. 2. The apparatus according to claim 1, wherein the engaging portion is a projecting portion, the locking portion is an engaging groove formed by a pair of projecting portions, and the projecting portion is sandwiched between the engaging grooves. Expansion flexible joint structure. The earthquake-resistant repair valve having an expansion and contraction flexible joint structure according to claim 1 or 2 , wherein the piping material is a repair valve body provided with the insertion port side.

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