JP2016023500A - Stand pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate accidents involving a stand pipe connected to a water hydrant and others, such as fracture of a main pipe at a connection between the main pipe and a receptacle and jumping out of a dislocated engaging pawl caused by various types of force exerted, including vibration from an explosion of remnant air in a water pipe, water hammering that takes place when a valve is closed, reactive force from water at a time of spraying, etc.SOLUTION: A stand pipe for a water hydrant comprises a main pipe having a receptacle and an elbow having a hose connection port. An annular cylinder part that holds an outer peripheral surface of the main pipe is formed at a cylinder part of a connection member on the receptacle, the annular cylinder part extending from the cylinder part of the connection member provided with an inner screw, or being held so as to connect with the cylinder part of the connection member. The configuration of the stand pipe mitigates concentration of bending stress exerted on an outer screw part of the main pipe, and ensures safety.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure for connecting a standpipe to be connected to an insertion port of an underground fire hydrant provided under a road surface, a fire hydrant or the like provided for a fire engine or the like, or an air valve. .

  Underground fire hydrants can be used for fire-fighting activities by connecting a fire hose, or used for water discharge to remove air accumulated in pipes, or as an emergency water supply in emergency situations. used. In this case, a stand pipe is used. This fire hydrant insertion port and a frame body that surrounds and surrounds the insertion parts around the periphery of the standpipe locking claw locking part are provided to prevent the standpipe from being removed and to ensure safety. (Patent Document 1). In addition, there is an invention (Patent Document 2) in which the latching pawl of the stand pipe is removed from the latching portion (locking groove) and removed from the insertion port with a single touch, that is, by operating the pulling lever with one hand.

JP 2012-255309 A JP 2000-328612 A

  Considering portability of the standpipe, aluminum parts are used for the material of the main pipe (pipe) and the receiving part, and bronze castings are used for the locking claws to reduce the weight. The main pipe is fixed with screws or adhesive after it is screwed in (so that it is screwed in), so if bending force, water hammer phenomenon, etc. are applied during use, the screw will rise, the main pipe and the receiving part An accident that breaks or a major accident that the main pipe scatters occurred at the connecting part.

  For example, there is a structure for connecting a stand pipe and an underground fire hydrant as shown in FIG. 6 and FIGS. 6-1 to 6-3. It is a coupling type joint usually called the Machino type. The outline is the locking force due to the protrusion of the locking claw (latching locking claw provided on the connecting member of the stand pipe described later) that is inserted and elastically protruded into the circumferential locking groove of the fire hydrant insertion port, The stand pipe is fixed to the fire hydrant. However, with this structure, there is a probability that the state shown in FIG. The cause is, for example, when the stand pipe attached to the digestive plug is swung back and forth, left and right in plan view, or when it is swung, other water hammer phenomenon, etc. In some cases, the threaded part of the main pipe was cracked, and it was broken from the fire hydrant so that the stand pipe was scattered. Further, FIG. 6-3 is a dangerous state in which a crack is generated in the receiving portion, and there is a probability that it is generated due to an increase in the swing width as described above, which is a problem.

  Further, Document 1 shown in FIG. 7 has an improvement on the structure. The point of the structure is the addition of a frame (frame 2 in the publication), but in the fire hydrant insertion part of this frame, a gap of 1 to 2 mm has to be provided in order to ensure smooth operation. Due to these gaps, the swing width has decreased compared to the conventional case. However, in the results of the bending strength experiment (see the excerpt page of the separate document “Bending Strength Experiment Report”), the strength improvement is , Not necessarily enough. In addition, since the frame body can move up and down, there may be a case where the effect of hardly restricting the swing width cannot be exhibited when the frame body is raised to the uppermost end.

  In addition, for example, it has been pointed out that the locking claw is manufactured from a bronze casting, so that it is easily deformed when a bending force is applied, and is inferior in strength. Also, if the stand pipe is repeatedly attached and detached many times, it is pointed out that the claw portion of the locking claw will wear out and come off from the circumferential locking groove, and in the worst case, the stand pipe will come off and jump out on the road There was also.

  In view of the above, the present invention discloses claims 1-5 and proposes the following improvements 1-4.

As improvement 1, “the main pipe and the receiving part are provided with an annular cylinder (support body, support ring, etc.) having a length of 10% or more and less than 50% of the outer diameter of the main pipe. The stress concentration of the bending stress acting on the entire outer screw portion (screw-in portion) or the weak portion of the screw valley portion such as the tip portion is alleviated.
As improvement 2, “rolling is regulated by inserting an O-ring between the locking claw and the end face of the receiving port and engaging this with the insertion part.” Since it is fixed with a cushioning material such as a rubber ring, rolling is reduced.

  As improvement 3, “claws, deformation, and wear are prevented by using a locking claw or a cover made of stainless steel.”

The invention of claim 1 is a stand pipe for a fire hydrant constituted by a main pipe provided with a receiving port portion and an elbow provided with a hose connection port connected to the main pipe.
The connecting member provided in the receiving port portion is formed with an annular cylindrical portion that holds the outer peripheral surface of the main pipe, and the annular cylindrical portion extends from the cylindrical portion of the connecting member provided with the internal screw, or the connecting member It is a stand pipe for a fire hydrant that is configured to be held so as to be connected to the cylinder part of the main part, and the entire outer threaded part (screwed part) of the main pipe, or the weak part (thin part) of the screw valley part such as the tip part. The stress concentration of the bending stress acting on can be relaxed. Further, it is effective for preventing the stand pipe from coming off and preventing the stand pipe from jumping out on the road. That is, safety is ensured.

  According to a second aspect of the present invention, the annular cylindrical portion is a support portion extending from a receiving end portion provided with an internal screw, and the support portion is provided in a cylindrical portion having a smaller diameter than the main body portion of the connecting member. 2. The stand pipe for a fire hydrant having the same inner diameter as that of the valley portion of the screw portion, and the upper cylindrical portion of the support portion being fitted to a partial outer peripheral surface (lower outer peripheral surface) of the main pipe, We propose the structure of the most effective support part to achieve the objectives.

  According to a third aspect of the present invention, the annular tube portion is a support ring connected to the receiving end portion, and has the same inner diameter as that of the small-diameter tube portion from the main body portion of the connecting member, and the lower tube portion of the support ring is a tube A standpipe for a fire hydrant configured to be fitted so as to be fitted to the outer peripheral surface of the part, and to achieve the object of claim 1, a simple structure that can effectively use a conventional standpipe is proposed. .

  The invention of claim 4 is a fire hydrant stand pipe in which the inner screw portion of the annular tube portion is screwed into an outer screw portion formed on the outer peripheral surface of the lower end of the main pipe. In order to achieve the objective, the most effective structure of the annular tube portion is proposed.

  The invention of claim 5 is a stand pipe for a fire hydrant having a configuration in which an O-ring and a rubber ring (buffer material) are interposed between contact surfaces of the opening peripheral surface of the receiving port portion and the outer peripheral surface of the fire hydrant insertion port. In order to achieve the objects of claims 1 to 4, the most effective structure of the connecting member is proposed.

It is the stand pipe of this invention, and the whole front view shown with a part missing The expanded sectional view of the principal part which showed 1st Example (support part) of the annular cylinder part The expanded sectional view of the principal part which showed 2nd Example (support ring) of the annular cylinder part The expanded sectional view of the important section showing other examples of the 1st example The expanded sectional view of the principal part which showed another example of the 1st example Overall front view of a conventional stand pipe, with a part omitted 6-1 is an enlarged cross-sectional view of the main part of a conventional stand pipe FIG. 6B is an enlarged cross-sectional view showing an example of a state in which a conventional stand pipe is cracked and the main pipe is broken from a receiving portion or the like. FIG. 6-3 is an enlarged cross-sectional view of an example of a conventional stand pipe in which the cover of the receiving portion is in a cracked state, for example. It is a partial drawing of literature 1, and is an expanded sectional view of the principal part of the conventional stand pipe

  Hereinafter, preferred embodiments of the present invention will be described. The basic structure common to each embodiment will be described. 1 is a main pipe (stand pipe main body) and 2 is an elbow (stand pipe sub pipe) connected to the main pipe 1. The outer screw portion 100 provided on the outer peripheral surface 1a of the lower end 1-1 of the main pipe 1 (in the vertical direction, as a general rule, a stand pipe is installed in a fire hydrant is an example) is connected to the connecting member 3 The inner screw portion 300 provided in the cylindrical portion 3a above the (core member, sleeve, or bush member) is screwed so that the main pipe 1 and the connecting member 3 are integrated. The cylindrical portion 3a is fitted on the outer peripheral surface 1a of the lower end 1-1 of the main pipe 1. Further, the upper portion of the main body portion 3b (stepped base portion) forming an annular shape below the connecting member 3 and the lower portion of the cylindrical portion 3a surround the flange 101 of the lower end 1-1 of the main pipe 1, and the main body portion 3b. The lower part (bottom part 3b1 mentioned later) is the structure extended below the lower end 1-1. On the outer peripheral surface of the main body portion 3b of the connecting member 3, a receiving port portion 5 having an opening 500 into which a locking groove of a fire hydrant described later is inserted is provided. In the recess 501 of the receiving portion 5, a plurality of latching claws 6 provided with springs (not shown), a claw seat 7 in which the latching claws 6 are stored, and the movement of the latching claws 6 (in the release direction). A plurality of cams 8 that manage the retreat) are accommodated. In addition, the skirt part 3b1 of the main-body part 3b of the connection member 3 is inserted and supported between the outer peripheral surface of the top plate of the nail seat 7 and the inner peripheral surface of the receiving part 5.

  In the figure, reference numeral 10 denotes a ring-shaped presser ring (chrysanthemum), which is mounted on the upper portion of the stepped portion 3c of the connecting member 3 and is provided on the outer peripheral surface 1a of the main pipe 1 so as to be movable up and down. The presser ring 10 and the cam 8 are connected through a plurality of connecting shafts 11. Further, one end of several operation rods 12 is supported on the presser ring 10, and the other end of the operation rod 12 is supported by an operation ring 13 loosely fitted on the outer peripheral surface 1 a of the upper portion of the main pipe 1. ing. The operation ring 13 is provided with a handle 1300 in the radial direction.

  In the figure, reference numeral 15 denotes a fire hydrant, which is provided with a locking groove (not shown). In addition, although not shown in figure, the stand pipe used for the test or research fire hydrant of the same structure as the digestive stopper 15 or connected to an air valve has the same structure.

  Next, one of the points of the present invention (first embodiment) will be described. As shown in FIG. 2, an annular cylindrical portion is formed by extending the cylindrical portion 3a of the connecting member 3, that is, an annular support portion 20 is formed. To do. As an example, it extends from the free end of the cylindrical portion 3a (extends from the inner screw portion as a base point), and the length of this extension is approximately 10% or more and less than 50% based on the diameter (outer diameter) of the stand pipe. The shape has a length (rise). The support portion 20 is fitted on a partial outer peripheral surface (lower outer peripheral surface) 1 a 1 of the outer peripheral surface 1 a of the main pipe 1. There is a feature that the stress concentration force of the bending stress acting on the threaded portion of the main pipe 1 can be relaxed via the support portion 20. In addition, when a clearance gap arises between the outer peripheral surface 1a and the inner peripheral surface of the support part 20, the resin which has elasticity is filled as needed. The main pipe 1 is attached to the connecting member 3, but the method is the same as in the prior art and is omitted. In the present invention, there is an effect that the swing width of the stand pipe is reduced and the swing width can be regulated. Moreover, although various forces act, such as the vibration by the explosion of the air which remains in a water pipe, the water hammer which generate | occur | produces at the time of valve closing, and the reaction force of the water by water discharge, the trouble which generate | occur | produces from these can be reduced.

  Further, another one of the points of the present invention (second embodiment) will be described. As shown in FIG. 3, an annular tube portion surrounding the tube portion 3a of the connecting member 3 and extending from the tube portion 3a to the upper portion. Yes, that is, an annular support ring 21 is formed. As an example, a lower end cylinder part 21a (overlapping part) surrounding the upper part of the cylinder part 3a and a main body cylinder part 21b connected to the lower end cylinder part 21a (connected from the inner screw part) are formed. The length of the main body cylinder portion 21b is a shape having a length (rise) of approximately 10% or more and less than 50% based on the diameter (outer diameter) of the stand pipe. The main body cylinder portion 21 b of the support ring 21 is fitted on a partial outer circumferential surface (lower outer circumferential surface) 1 a 1 of the outer circumferential surface 1 a of the main pipe 1, and the lower end cylindrical portion 21 a is fitted on the cylindrical portion 3 a of the connecting member 3. Is done. There is a feature that the stress concentration force of the bending stress acting on the threaded portion of the main pipe 1 can be relaxed through the support ring 21. Further, the support ring 21 can be used in a conventional stand pipe and is useful. Others are in accordance with the first embodiment described above. The support ring 21 is attached to the cylindrical portion 3 a of the connecting member 3. After that, the main pipe 1 is attached to the connecting member 3, but the method is the same as the conventional method and is omitted.

  The relation and movement (engagement / disengagement of the fire hydrant and the stand pipe) of the locking claw 6, the cam 8, etc., the operation ring 13, and the handle 1300 will be described. The handle 1300 is supported, the handle 1300, the operation ring 13, and the presser ring. Pull 10 up. By this pulling up, the cam 8 is pulled up via the connecting shaft 11. By pulling up the cam 8, the restriction of the cam 8 with respect to the locking pawl 6 is released. When the restriction is released, the latching claw 6 is returned by a reaction force of a spring (not shown) (returns to the radial direction of the claw seat 7), and the latching claw 6 is detached from the locking groove 1501 of the fire hydrant 15. With this separation, the locking (fitting) relationship between the stand pipe and the fire hydrant 15 is released, and the stand pipe becomes free.

  In addition, when the stand pipe is locked (fitted) to the fire hydrant 15, the stand pipe is supported and the receiving port portion 5 is fitted into the fire hydrant 15, so that the opening 500 of the receiving port portion 5 is fitted into the insertion opening 1500. At the same time, the insertion opening 1500 pushes the locking claw 6 projecting into the receiving opening 5, and the insertion opening 1500 contacts the opening of the receiving opening 5 and the claw seat 7. The hooking claw 6 is restored by the reaction force of the spring and is locked to the locking groove 1501 at the hook where the insertion opening 1500 has passed over the opening of the receiving portion 5 and the claw seat 7, and the standpipe The main pipe 1 is set (attached) to the fire hydrant 15. At the time of this attachment, the movement of the locking claw 6, the cam 8, etc., the operation ring 13, and the handle 1300 is not in principle. In the figure, reference numeral 1502 denotes a locking rod at the opening tip of the fire hydrant 15.

  The other one of the other points of the present invention (the other of the first embodiment) will be described. As shown in FIG. 4, the outer peripheral surface 500 a of the opening 500 of the receiving port 5 and the outer peripheral surface of the insertion opening 1500 of the fire hydrant 15. A cushioning material 18 having sealing properties and elasticity, such as an O-ring and a rubber ring, is interposed on the contact surface with 1500a. For example, the stand pipe, the main pipe 1, and / or the receiving port 5 or the like is prevented from rolling. It is useful for improving rigidity.

  Further, another one of the points of the present invention (another example of the first embodiment) will be described. The outer peripheral surface 5b of the receiving port portion 5 is formed by the strong stainless steel annular cover 16 shown in FIG. Covering structure. By making the receiving port 5 and / or the cover 16 stainless steel, cracking, deformation, and wear are prevented. Similarly, cracking, deformation, and wear are prevented by making the latching pawl 6 stainless steel.

  In the figure, 17 is a handle.

  Each embodiment described above shows a preferable example, and other structures and means having similar effects and features are within the scope of the present invention.

1 Main pipe 1a Outer peripheral surface 1a1 Partial outer peripheral surface (lower outer peripheral surface)
1-1 Lower end 100 External screw part 101 Flange 2 Elbow 3 Connecting member 3a Tube part 3b Main body part 3b1 Bottom part 3c Stepped part 300 Inner screw part 5 Receiving part 5b Outer peripheral surface 500 Opening 500a Peripheral surface 501 Concave part 6 Locking claw 7 Claw seat 8 Cam 10 Presser ring 11 Connection shaft 12 Operation rod 13 Operation ring 1300 Handle 15 Fire hydrant 1500 Insertion opening 1500a Outer surface 1501 Locking groove 1502 Locking rod 16 Cover 17 Handle 18 Buffering material 20 Support part 21 Support ring 21a Bottom cylinder Part 21b Body cylinder part

For example, there is a structure for connecting a stand pipe and an underground fire hydrant as shown in FIG. 6 and FIGS. 6-1 to 6-3. It is a coupling type joint usually called the Machino type. The outline is the locking force due to the protrusion of the locking claw (latching locking claw provided on the connecting member of the stand pipe described later) that is inserted and elastically protruded into the circumferential locking groove of the fire hydrant insertion port, The stand pipe is fixed to the fire hydrant. However, with this structure, there is a probability that the state shown in FIG. The cause is, for example, when the standpipe attached to the fire hydrant is swung back and forth, left and right in a plan view, or when it is swung, other water hammer phenomenon, etc. There was a case where a crack occurred in the threaded part of the main pipe, and the stand pipe was scattered by breaking from the fire hydrant. Further, FIG. 6-3 is a dangerous state in which a crack is generated in the receiving portion, and there is a probability that it is generated due to an increase in the swing width as described above, which is a problem.

Invention of Claim 1 comprised with the receiving port part detachably provided in the insertion opening of a fire hydrant, the connection member which connects a receiving port part and the lower end of a main pipe, and the elbow provided with the hose connection port connected to the main pipe In a stand pipe for a fire hydrant,
The connecting member is formed with a cylindrical portion having an inner screw portion to be screwed on an outer screw portion formed on a lower outer peripheral surface of the main pipe, and a support portion extended from an upper portion of the inner screw portion of the cylindrical portion. The formed support portion is a stand pipe for a fire hydrant fitted on the upper outer peripheral surface of the outer thread portion of the main pipe, and the entire outer thread portion (threaded portion) of the main pipe, or a thread valley portion such as a tip portion. The stress concentration of bending stress acting on the fragile part (thin place) can be relaxed. Further, it is effective for preventing the stand pipe from coming off and preventing the stand pipe from jumping out on the road. That is, safety is ensured. In order to achieve the object of claim 1, the most effective structure of the support portion is proposed.

Invention of Claim 2 comprised with the receptacle part detachably provided in the insertion opening of a fire hydrant, the connection member which connects a receptacle part and the lower end of a main pipe, and the elbow provided with the hose connection port connected to the main pipe In a stand pipe for a fire hydrant,
The connecting member is formed with a cylindrical portion having an inner screw portion to be screwed on an outer screw portion formed on a lower outer peripheral surface of the main pipe, and a lower end cylindrical portion and a lower end are formed on the cylindrical portion and the main pipe. A support ring that extends from the cylinder part and is formed with the main body cylinder part is provided. The lower end cylinder part is fitted on the outer side of the cylinder part , and the main body cylinder part is fitted on the upper outer peripheral surface of the outer screw part of the main pipe. In order to achieve the object of claim 1, a simple structure that can effectively use a conventional stand pipe is proposed.

According to the invention of claim 3 , the receiving part is fitted into the insertion opening of the fire hydrant, and the opening of the receiving part is provided with a retractable locking claw, and the locking claw is engaged with the locking groove of the insertion opening. A stand pipe for a fire hydrant that is detachable and can be operated with an operating rod attached to the outer peripheral surface of the main pipe and a handle provided on the outer peripheral surface. In addition, the structure of the main pipe () and the receiving portion, and the operation rod and handle are proposed.

The invention of claim 4 is a stand pipe for a fire hydrant having a configuration in which a buffer material made of an O-ring or a rubber ring is interposed between contact surfaces of the opening peripheral surface of the receiving port portion and the outer peripheral surface of the insertion port of the fire hydrant. In order to achieve the objects of claims 1 and 2, the most effective structure of the connecting member is proposed.

In the figure, reference numeral 15 denotes a fire hydrant, which is provided with a locking groove (not shown). Although not shown, a test or research fire hydrant having the same structure as the fire hydrant 15 or a stand pipe connected to an air valve has the same structure.

Claims (5)

In a stand pipe for a fire hydrant composed of a main pipe provided with a receiving portion and an elbow provided with a hose connection port connected to the main pipe,
The connecting member provided in the receiving port portion is formed with an annular cylindrical portion that holds the outer peripheral surface of the main pipe, and the annular cylindrical portion extends from the cylindrical portion of the connecting member having an internal screw, Alternatively, a standpipe for a fire hydrant, characterized in that it is configured to be held so as to be connected to the cylindrical portion of the connecting member.   The annular tube portion is a support portion extending from a receiving end provided with the inner screw, and the support portion is provided in a tube portion having a smaller diameter than the main body portion of the connecting member. The standpipe for a fire hydrant according to claim 1, wherein the stand pipe has the same inner diameter as that of the valley portion, and the upper cylindrical portion of the support portion is configured to be fitted to a partial outer peripheral surface (lower outer peripheral surface) of the main pipe.   The annular cylindrical portion is a support ring connected to the receiving end portion, and has an inner diameter that is the same as that of the small-diameter cylindrical portion than the main body portion of the connecting member, and the lower cylindrical portion of the support ring is connected to the cylindrical portion. The standpipe for a fire hydrant according to claim 1, wherein the standpipe is configured to be fitted on an outer peripheral surface.   The stand pipe for a fire hydrant according to any one of claims 1 to 3, wherein the inner screw portion of the annular tube portion is configured to be screwed into an outer screw portion formed on a lower end outer peripheral surface of the main pipe. .   5. The structure according to claim 1, wherein an O-ring and a rubber ring (buffer material) are interposed between contact surfaces of the opening peripheral surface of the receiving port portion and the outer peripheral surface of the fire hydrant insertion port. Standpipe for fire hydrant.

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