A connecting fitting, a standpipe using the same, a large-volume drain valve, an air valve with a ball-bearing device, and a pipe cleaning and drainage work device comprising the standpipe and the large-volume drain valve or the air valve with a ball-bearing device installed together.

Abstract

To provide a coupling device that prevents accidental detachment and is safe, quick, and easy to use. [Solution] The coupling fitting 1 consists of a connecting fitting 20 and a receiving fitting 2 that are connected coaxially. The outer surface of the connecting fitting 20 has a plurality of locking projections 21 protruding along the circumferential direction. Locking pins 24 are individually arranged on the locking projections 21, passing through the locking projections 21 along the axial direction and extending toward the receiving fitting 2 by an elastic material. The end face of the receiving fitting 2 facing the connecting fitting 20 is provided with a plurality of recesses 10 that allow the passage of the locking projections 21. Between each of the recesses 10, one of a plurality of wide side portions 8 is individually located. The wide side portion 8 is individually provided with an insertion hole 9 that receives the tip portion 24h of the locking pin 24 and enters toward the tip portion 20h side of the position of the locking projection 21 when the connecting fitting 20 is rotated in the circumferential direction. Directly below each wide side portion 8, a groove 12 for receiving the locking projection 21 is individually located.

Description

Technical Field

[0001] The present invention relates to a coupling fitting, a standpipe using the same, a large-capacity drain valve, an air valve with a ball pusher, and equipment for pipeline cleaning and drainage work in which the standpipe and the large-capacity drain valve or the air valve with a ball pusher are provided together.

Background Art

[0002] For example, coupling fittings for equipment used in pipeline cleaning and drainage work carried out after laying large-diameter water supply pipes require a coupling strength that can withstand large flow rates and high internal pressures, and a coupling structure that enables quick and easy attachment and detachment operations.

[0003] Regarding such a coupling structure, the insertion-type fitting defined in JIS B 9911 (see Non-Patent Document 1) is widely used for coupling between equipment. This insertion-type fitting is widely used for equipment connected to water supply systems including fire-fighting equipment, and is excellent in terms of availability and ease of attachment and detachment operations.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, on the other hand, accidents have been reported in which the above-mentioned insertion-type fitting separates and detaches during water flow. That is, since the locking force is maintained by the protruding force of the claw body that elastically protrudes into the circumferential groove of the insertion port, there is a problem that the locking force decreases due to vibration by the internal fluid, force by pressure, deformation of the locking claw or the insertion fitting due to repeated use, or wear, resulting in separation.

[0006] The present invention aims to solve the problems of the aforementioned plug-in fittings and prevent accidents caused by a decrease in locking force and detachment due to the force of the internal fluid, or deformation or wear of the locking claws or plug fittings due to repeated use, thereby providing a coupling fitting that can be used more safely, quickly, and easily. It also aims to provide a standpipe, a large-volume drain valve, an air valve with a ball pusher, and equipment for pipeline cleaning and drainage work that combines the standpipe and the large-volume drain valve or the air valve with a ball pusher. [Means for solving the problem]

[0007] To solve the aforementioned problems, the coupling fitting of the present invention is It is a connecting fitting consisting of a fitting and a receiving fitting that are connected to each other coaxially. Multiple locking protrusions are provided on the outer circumferential surface of the aforementioned fitting, and each of the locking protrusions has a locking pin that penetrates the locking protrusion in the axial direction and extends toward the opposing receiving fitting side by an elastic material. In the receiving fitting, the end face facing the insert fitting is provided with a plurality of recesses along the circumferential direction of the end face, each allowing the passage of the locking projection individually. Between each of the recesses, one of the plurality of wide sides is individually positioned, and each wide side has an insertion hole that receives the tip of the locking pin and enters the tip side of the position of the locking projection when the insert fitting or the receiving fitting is rotated in the circumferential direction. Furthermore, directly below each wide side, there is an individually positioned groove for receiving the locking projection.

[0008] The plurality of locking protrusions are provided at equal intervals along the circumferential direction on the outer surface of the fitting, and the plurality of recesses and the plurality of wide edges may each be provided at equal intervals on the end face of the receiving fitting.

[0009] An annular packing may be sandwiched between the inner circumferential surface of the receiving fitting and the outer circumferential surface of the tip side of the inserting fitting.

[0010] The present invention also includes a standpipe equipped with the aforementioned coupling fitting at its inlet.

[0011] The outlet of the standpipe is a separable elbow, and the elbow may be connected by a coupling method that allows for flexible mounting direction using various couplings.

[0012] The present invention also includes a large-volume drain valve equipped with the aforementioned coupling fitting at the outlet.

[0013] The present invention also includes an air valve with a ball pusher, which has the aforementioned coupling fitting at the outlet.

[0014] A large-volume drain valve may also be provided in which the lift amount of the valve body in the large-volume drain valve is equal to or greater than the inner diameter of the discharge pipe constituting the large-volume drain valve.

[0015] The present invention also includes equipment for pipe cleaning and drainage work that includes the standpipe and either the large-volume drain valve or the air valve with a ball pusher.

[0016] It may also be used as equipment for pipe cleaning and drainage work, equipped with the aforementioned standpipe and the aforementioned large-volume drain valve. [Effects of the Invention]

[0017] According to the coupling fitting of the present invention, when inserting (pushing in) the insert fitting coaxially into the receiving fitting, each locking projection of the insert fitting is passed individually through each recess of the receiving fitting, and then one fitting is slightly rotated circumferentially relative to the other fitting. As a result, each lock pin on the insert fitting side slides along the upper surface of each wide side of the receiving fitting side while under the pressure of the elastic material, and then enters each insertion hole individually from the upper surface of each wide side, reaching a position deeper than the bottom surface of the groove. As a result, each wide side of the receiving fitting becomes a strong bayonet-type connection, fixed in the axial, radial, and circumferential directions by the lock pins and locking projections on the insert fitting side. Therefore, even when high-pressure fluid is passed through the interior at any time or sequentially, a strong connection can be achieved quickly and easily. [Brief explanation of the drawing]

[0018] [Figure 1] Perspective view showing the plug fitting and the receiving fitting that constitute the coupling fitting of the present invention. [Figure 2] Side view showing the plug fitting and vertical cross-sectional view showing the receiving fitting. [Figure 3] (A) is a plan view showing the positional relationship for inserting the plug fitting into the receiving fitting, and (B) is a side view of the plug fitting and a vertical cross-sectional view of the receiving fitting along the arrow view of line B-B in (A). [Figure 4] (A) and (B) are plan views showing the state of sequentially rotating the plug fitting inserted inside the receiving fitting along its circumferential direction, and (C) is a vertical cross-sectional view of the coupling fitting showing the state along the arrow view of line C-C in (B) after the rotation operation. [Figure 5] Side view showing a standpipe with the coupling fitting attached to the inlet at the lower end and two types of elbows that can be connected to its outlet. [Figure 6] Vertical cross-sectional view showing a large-capacity drain valve with the coupling fitting attached to the outlet of the discharge pipe. [Figure 7] (A) and (B) are schematic views showing the installation of a large-capacity drain valve or an air valve with a ball pusher. [Figure 8] Partial vertical cross-sectional view showing the air valve with a ball pusher used in the present invention and its vicinity. [Figure 9] Schematic view showing the configuration of equipment for pipeline cleaning and drainage work including a coupling fitting, a standpipe, and a large-capacity drain valve.

Mode for Carrying Out the Invention

[0019] Hereinafter, the mode for carrying out the present invention will be described. Figure 1 is a perspective view showing the insert fitting 20 and the receiving fitting 2 that constitute the coupling fitting 1 of the present invention, and Figure 2 shows a side view of the insert fitting 20 and a vertical cross-sectional view of the receiving fitting 2. As will be described later, the insert fitting 20 also includes multiple sets of locking pins 24 and coil springs (elastic material) 28 arranged on the outer circumferential surface of the pipe body 31 on the standpipe 30 side. The receiving fitting 2 and the insert fitting 20 are made of, for example, cast iron or cast steel including stainless steel.

[0020] As shown in Figures 1 and 2, the mounting bracket 2 has a cylindrical hollow section (inner part) 4 inside a cylindrical body 3. An annular flange 5 extends concentrically toward the axis from the lower end of the hollow section 4, and above it, a recessed groove 6 with a rectangular vertical cross-section and an annular shape is positioned horizontally. A packing 14 with a circular vertical cross-section and an annular shape is fitted into the recessed groove 6. Above the recessed groove 6, a horizontal ring-shaped flat step 7 is arranged along the entire circumference of the inner surface of the hollow section 4.

[0021] The upper end surface of the receiving bracket 2 has three (or more) wide sides 8 projecting toward the axis at equal intervals along its circumference. Between each wide side 8 and the stepped portion 7, there is a groove 12 that opens toward the hollow portion 4. At the center of each wide side 8 and each groove 12 in the circumferential direction, there is an insertion hole 9 that opens upward. The insertion hole 9 penetrates the center of each wide side 8 and stops at a hemispherical bottom surface just below the bottom surface of the center of each groove 12. Between each of the three wide side 8, there are three (or more) recesses 10, each consisting only of a narrow upper end surface, at equal intervals. These recesses 10 are used for inserting the locking projection 21 on the inserting bracket 20, as will be described later. Note that the wide side 8, insertion hole 9, groove 12, and locking projection 21 may be four or more in number.

[0022] As shown in Figures 1 and 2, the fitting 20 has three (or more) locking projections 21, each with an overall arc shape, projecting from its cylindrical outer surface at equal intervals. A circular passage portion 22 is positioned in the center of each locking projection 21 in the circumferential direction. Three long locking pins 24, which are aligned with the axial direction of the pipe body 31 of the standpipe 30 (described later) and are coaxially welded to the fitting 20 and its upper side, are individually able to pass through the passage portion 22. The passage portion 22 is not limited to the illustrated form in which a pair of symmetrically formed arcuate surfaces are formed along the circumferential (longitudinal) direction of the locking projection 21; it may also be formed in which a pair of substantially symmetrical flat surfaces are formed on the locking projection 21 along the radial direction.

[0023] The lock pin 24 moves back and forth along the axial direction of the fitting 20 and the axial direction of the pipe body 31 of the standpipe 30, passing through brackets 23 and 27 protruding from the outer surface of the pipe body 31, and is fixed by a retaining clip 25 located between them. The upper end of the lock pin 24 passes through a coil spring 28 and is connected to the pin operating part 26. When not in use, the coil spring 28 is compressed along the axial direction, and can be extended along the axial direction by releasing, for example, a restraining means (not shown) that fixes the position of the retaining clip 25, thereby freeing it downwards. That is, when not in use, the coil spring 28 is biased to extend downwards. The coil spring 28 may be replaced with a band-shaped or string-shaped elastic material made of synthetic rubber or the like that can perform a similar function. The coil spring 28 may also be designed to contract towards the tip side (towards the receiving fitting 2) when not in use.

[0024] Furthermore, since most of the lock pin 24 excluding the hemispherical tip portion 24h, the brackets 23 and 27, the fastener 25, the coil spring 28, and the pin operating portion 26 are components necessary for connecting the receiving fitting 2 and the insert fitting 20, in this invention they are considered to belong to the insert fitting 20 side.

[0025] Next, the process of connecting the receiving bracket 2 and the inserting bracket 20 will be explained with reference to Figures 3 and 4. In the plan views of Figures 3(A), 4(A), and (B), the position of the receiving bracket 2, shown by the solid line, is considered fixed, while the inserting bracket 20, shown by the dashed line, is considered movable. First, as shown in Figure 3(A), the receiving bracket 2 and the inserting bracket 20 are positioned coaxially opposite each other so that each locking projection 21 of the inserting bracket 20 is positioned directly in front of each recess 10 of the receiving bracket 2.

[0026] Next, as shown by the thick arrow in Figure 3(B), the inserting fitting 20 is pushed (inserted) into the hollow portion 4 of the receiving fitting 2. At this time, it is pushed in until the tip portion 20h of the inserting fitting 20 contacts the upper surface of the flange 5 of the receiving fitting 2. As a result, in a side view, each locking projection 21 of the inserting fitting 20 reaches a position (level) where it can individually enter each groove 12 of the receiving fitting 2.

[0027] Furthermore, as shown by the thick dashed curved arrow in Figure 4(A), the insert fitting 20, which is coaxially inserted into the hollow portion 4 of the receiving fitting 2, is rotated slightly clockwise. As a result, one end of each locking projection 21 of the insert fitting 20 enters the respective groove 12 of the receiving fitting 2. At the latest by this stage, the restraining means (not shown) that fixed the position of the stopper 25 on the insert fitting 20 side is released, and each lock pin 24 is left free (extendable) in the downward direction.

[0028] Next, as shown by the thick dashed curved arrow in Figure 4(B), the insert fitting 20, which is inserted coaxially into the hollow portion 4 of the receiving fitting 2, is rotated slightly further clockwise. Then, as shown in the figure, the tips 24h of each lock pin 24 on the insert fitting 20 side move onto the upper surface of each wide side portion 8 on the receiving fitting 2 side, and after sliding along the upper surface of each wide side portion 8, they are individually and simultaneously inserted into each insertion hole 9 on the receiving fitting 2 side. In the rotation operation between Figures 3(A) and 4(A) and 4(B) described above, the total rotation angle of the insert fitting 20 is 60 degrees. Note that if there are four wide side portions 8, insertion holes 9, recesses 10, grooves 12 on the receiving fitting 2 side, and four locking projections 21 and lock pins 24 on the insert fitting 20 side, the total rotation angle is 45 degrees.

[0029] As a result, as shown in Figure 4(C), the lock pins 24 on the insert fitting 20 side are individually inserted into each insertion hole 9 of the receiving fitting 2, and the locking projections 21 on the insert fitting 20 side are individually clamped into each groove 12 of the receiving fitting 2. This allows the receiving fitting 2 and the insert fitting 20 to be coaxially and firmly connected in the axial, circumferential, and radial directions, and enables the formation of a bayonet-type coupling fitting 1 quickly and easily. Moreover, since the space between the body 3 of the receiving fitting 2 and the outer surface of the insert fitting 20 is sealed by the packing 14, it is also possible to maintain a good coupling state.

[0030] Furthermore, the aforementioned pushing and rotating operation may be performed with the insert fitting 20 fixed, pushing in the receiving fitting 2, and then rotating it. Also, when releasing the coupling fitting 1, the pin operating part 26 is operated to release the restraining means of the stopper 25, and then the aforementioned rotating and pulling operation is performed in the reverse direction. In addition, the multiple insertion holes 9 may be formed at equal intervals at arbitrary intermediate positions in the circumferential direction for each wide side portion 8, and the multiple locking pins 24 may also be arranged so that they pass through at equal intervals at arbitrary intermediate positions in the circumferential direction for each locking projection 21. Moreover, the outer circumference of the locking pins 24 and coil springs 28 on the insert fitting 20 side may be covered with a protective cover within the range of the length dimension of the pipe body 31.

[0031] Figure 5 is a side view showing a standpipe 30 with the aforementioned bayonet-type coupling fitting 1 attached to its lower end, and two types of large-diameter elbows 35 and small-diameter elbows 36 that can be connected to its upper end. A fitting 20 is fixed to the inlet at the lower end of the pipe body 31 of the standpipe 30, and multiple locking pins 24 are arranged along the outer circumference of the pipe body 31. On the other hand, a receiving fitting 2 is fixed to the discharge port (upper end) of an underground fire hydrant (not shown). Multiple elbow connecting fittings 32 are arranged symmetrically in a plan view on the discharge port 33 side of the upper end of the pipe body 31.

[0032] Either a large-diameter elbow 35 or a small-diameter elbow 36 is selectively connected to the outlet 33 at the upper end of the pipe body 31. The large-diameter elbow 35 has an enlarged diameter section 35T and a large-diameter curved section 37 between a connecting section 34 with the same inner diameter as the outlet 33 of the pipe body 31 and a water discharge section 39D having a larger inner diameter than the connecting section. On the other hand, the small-diameter elbow 36 has a connecting section 34 and a curved section 38 and a water discharge section 39d with the same inner diameter as the connecting section 34. The large-diameter elbow 35 and the small-diameter elbow 36 are connected in a coupling manner that allows for free attachment (extension) direction to the outlet 33 of the pipe body 31 in a plan view.

[0033] During water discharge operations such as fire, the elbow connecting fitting 32 is operated in advance to connect either the large-diameter elbow 35 or the small-diameter elbow 36 to the discharge port 33 of the pipe body 31, and the standpipe 30, with the insert fitting 20 fixed to the lower end of the pipe body 31, is positioned directly above an underground fire hydrant (not shown) with a separate receiving fitting 2 attached to its discharge port. Furthermore, as described above, after pushing the insert fitting 20 into the hollow part 4 of the receiving fitting 2, the pipe body 31 of the standpipe 30, with the spring pressure of each lock pin 24 released, is rotated to form a bayonet-type coupling fitting 1. As a result, even in an emergency, a strong coupling can be quickly and easily achieved across the underground fire hydrant, standpipe 30, and the large-diameter elbow 35 or small-diameter elbow 36, contributing to effective water discharge and firefighting operations.

[0034] Figure 6 is a vertical cross-sectional view showing a large-volume drain valve 40 with the coupling fitting 1 attached to the outlet (upper end) of the discharge pipe 46. As shown in the figure, the large-volume drain valve 40 includes a cylindrical valve body 42 connected to the upper end of a branch pipe 70a that branches upward from the water supply pipe 70 (described later), a ring-shaped valve seat 45 mounted along the lower end of the inner circumferential surface of the valve body 42, a valve element 44 with a three-layer structure that moves freely up and down inside the valve body 42, a lifting shaft 43 attached to the lower end of the valve element 44 and moving up and down inside the valve body 42, a discharge pipe 46 that communicates laterally with the inner circumferential surface of the valve body 42 and has a substantially L-shape in side view, and a disc-shaped cover plate 47 that covers the upper end of the valve body 42. The receiving fitting 2 of the coupling fitting 1 is fixed coaxially to the outlet on the upper end of the discharge pipe 46.

[0035] A lifting shaft 43 passes through the center of the cover plate 47 via a sealing material 48, allowing it to move up and down vertically. A male threaded rod 49, with male threads (not shown) engraved on its outer surface, is connected to the upper side of the lifting shaft 43. This male threaded rod 49 is surrounded by a cylindrical cover 50 and passes upward while being screw-connected to a female threaded hole (not shown) of a nut body 53 attached to the upper side of the inner surface of the cover 50. A valve opening / closing shaft 52 is fixed to the upper end of the male threaded rod 49, and a cover portion 51 is formed on the bottom side of the valve opening / closing shaft 52, which connects to the upper end of the cover 50. A large-diameter handle (not shown) is attached when rotating the valve opening / closing shaft 52.

[0036] The lift (raising and lowering) amount L of the valve body 44 is set to be equal to or greater than the inner diameter D (length) of the drain pipe 46. When draining a large amount of tap water from the branch pipe 70a side, the valve opening / closing shaft 52, to which a handle (not shown) is attached is rotated, and the valve body 44 is raised together with the male threaded rod 49 and the lifting shaft 43, as shown by the dashed arrow in Figure 6, by separating it from the valve seat 45. As a result, the large amount of tap water that has flowed into the valve body 42 from the branch pipe 70a side passes through the inside of the bayonet-type coupling fitting 1, which includes the discharge pipe 46 and the receiving fitting 2, with force and smoothness and is drained to the outside. Therefore, in emergency situations, large-scale drainage work can be performed quickly and safely by raising and lowering the valve body 44.

[0037] Figure 7(A) is a schematic diagram showing a repair valve 71 and an air valve 55 positioned above a branch pipe 70a that rises from the water supply pipe 70. Under normal conditions when no large-volume drainage is being performed, the air valve 55, with a cover 55f attached, is connected to the upper side of the repair valve 71. Figure 7(B) is a schematic diagram showing the installation of a large-volume drain valve 40 or an air valve 55 with a ball pusher 40a. When using the large-volume drain valve 40, the air valve 55 is removed, and the large-volume drain valve 40 is connected to the upper side of the repair valve 71 to perform drainage. Note that in Figure 7(B), the large-volume drain valve 40 is connected without removing the repair valve 71.

[0038] The dashed arrows in Figure 7(B) indicate a configuration in which the large-volume drain valve 40 is connected to the upper side of the repair valve 71. However, the process of installing an air valve 55 with a ball-retainer 40a in a different embodiment is shown by the solid arrows in Figure 7(B). As shown in the figure, first, the cover 55f covering the upper part of the air valve 55 connected to the upper side of the repair valve 71 is removed. Furthermore, a ball-retainer 40a, whose internal valve structure and valve function differ from that of the large-volume drain valve 40, is connected to the upper side of the air valve 55. In the following, the differences from the large-volume drain valve 40 will be mainly explained for a different embodiment of the present invention using an air valve 55 with a ball-retainer 40a.

[0039] Figure 8 is a partial vertical cross-sectional view showing the air valve 55 with the aforementioned ball retainer 40a and its vicinity, and is also a schematic diagram illustrating their operation. The air valve 55 is designed to prevent a sudden increase in pressure by preferentially discharging air that rises along with the tap water supplied through the main water pipe 70, branch pipes 70a, and repair valve 71. In the ball retainer 40a, instead of a valve body 44, the lower end of a lifting shaft 43, to which a cylindrical body (ball retainer) 56 made of, for example, polyvinyl chloride (PVC) and opening downwards is bolted, passes through the exhaust hole 55a. The exhaust hole 55a is formed in the center of the joint 54 between the ball retainer 40a and the air valve 55. The lifting shaft 43 is fixed integrally with a nut body 53 via an upper male threaded rod 49. That is, the exhaust hole 55a is always open. Aside from these differences, the ball pusher 40a is identical or equivalent to the large-volume drain valve 40. A repair valve 71 is connected between the air valve 55 and the branch pipe 70a of the water supply pipe 70.

[0040] Below the cylindrical body 56, a disc-shaped hollow umbrella float 57 and a spherical hollow float 59 are arranged vertically. The umbrella float 57 has an inclined portion 57a ​​on its upper surface that slopes downward in a ring shape on its outer circumference, and a curved recess 57b on its bottom surface that slopes upward. The umbrella float 57 and the spherical float 59 are surrounded by a guide 58 that allows them to move only in the vertical direction. The guide 58 has an outer shape that is hemispherical on its bottom surface and cylindrical in its middle and upper parts, with a bottom hole 58a opening on the center side of the bottom surface and multiple side holes 58b opening on the upper end of the side surface. The air valve 55 with a ball pusher 40a consists of at least an exhaust hole 55a, an outer casing 55b, two floats 57 and 59, and a guide 58. Generally, a ventilation hole (not shown) is formed in the center of the umbrella-shaped float 57, penetrating vertically, and ventilation holes are also formed in appropriate locations on the cylindrical body 56. Furthermore, the cylindrical body 56, the umbrella-shaped float 57, and the spherical float 59 may be connected to each other by screws, chains, or the like (not shown).

[0041] Next, the operation of the air valve 55 with the ball pusher 40a will be explained with reference to Figure 8. When tap water is supplied to the branch pipe 70a connected to the lower water supply pipe 70, the water is supplied to the umbrella-shaped float 57 side and the spherical float 59 side within the guide 58 through the multiple side holes 58b of the guide 58, as shown by the dashed arrows in Figure 8. In this case, air supplied with the tap water is generally discharged to the outside preferentially through the exhaust hole 55a. At this time, air that enters between the two floats 57 and 59 is also discharged through the exhaust hole 55a through the through hole in the center of the umbrella-shaped float 57.

[0042] On the other hand, since the lifting shaft 43, the male threaded rod 49, and the nut body 53 shown in Figure 6 are fixed to each other, the downward force acting on them is greater than the buoyancy acting on the two floats 57 and 59. As a result, as shown in the figure, tap water is supplied to the valve body 42 and discharge pipe 46 side through the multiple side holes 58b in the guide 58 and the exhaust hole 55a. Therefore, with the air valve 55 with a ball pusher 40a, it is possible to reliably prevent a sudden rise in air pressure and perform water supply work stably, along with saving labor. Note that the valve-integrated float 57 and the spherical float 59 may be combined into a single float with their external shapes combined.

[0043] Figure 9 is a schematic diagram showing the configuration of pipe cleaning and drainage equipment 60, including a coupling fitting 1, a standpipe 30, and a large-volume drain valve 40. For example, if foreign matter such as soil and sand accumulates inside a water supply pipe 70 due to aging or during disasters such as heavy rain, it is necessary to quickly and easily discharge such foreign matter to the outside. As shown in the figure, an excavation trench 62 is formed above the water supply pipe 70 in which foreign matter such as soil and sand has accumulated, and a large-volume drain valve 40, which has a bayonet-type coupling fitting 1 attached to the outlet of a discharge pipe 46, is connected to the upper side of a branch pipe 70a that rises upright from the water supply pipe 70 via a repair valve 71. A standpipe 30 having a fitting 20 at the lower end is connected to the upper end of the discharge pipe 46 so as to be able to communicate. The large-volume drain valve 40 may be replaced with an air valve 55 with a ball pusher 40a, or conversely, the air valve 55 may be removed and the large-volume drain valve 40 may be installed. Furthermore, it is recommended to install a repair valve 71 between the large-volume drain valve 40 or air valve 55 and the water supply pipe 70. By installing such a repair valve 71, it becomes unnecessary to remove valves, etc., between the branch pipe 70a and the air valve 55. For example, it can be easily constructed by removing the top cover from a normal air valve and attaching the ball pusher 40a.

[0044] Specifically, the casing housing the air valve 55 is opened, the repair valve 71 located between the air valve 55 and the branch pipe 70a is operated to stop the water flow, and then the cover 55f of the air valve 55 is removed. Next, the ball pusher 40a is attached to the top of the air valve 55. By operating the lifting shaft 43 and bringing the cylindrical body 56 against the floats 57 and 59, the floats 57 and 59 are prevented from rising, and the flow path of tap water is secured. Furthermore, the standpipe 30 is attached to the discharge pipe 46, and the subsequent equipment is assembled. Finally, when the preparations for the drainage work are complete, the repair valve 71 is opened to drain the water. When drainage is finished, the repair valve 71 is closed, and the standpipe 30 and other components are removed in the reverse order, restoring the system to its original state.

[0045] At the outlet 33 at the upper end of the standpipe 30, a large-diameter elbow 35 and a recoil-reducing pipe 72, which has a roughly crank shape in side view, are connected in a roughly inverted U-shape so as to be able to communicate with each other. As shown in Figure 8, the lower end of the recoil-reducing pipe 72 is connected to the hose 74 on the ground 64, communicating with it. A drain nozzle 76, which has a roughly inverted L-shape in side view, is connected to the discharge side of the hose 74, and the drain port 78 of the drain nozzle 76 opens upward to a sewer or similar structure, such as a drain basin 66. The drain nozzle 76 is supported on the ground 64 via a leg base 77. The leg base 77 is fitted with a multi-purpose transport handle (not shown) that extends symmetrically along the front-rear direction in Figure 8. In Figure 9, a pump (not shown) and a drive source such as a generator or engine-driven motor that drives it are located at one of the positions in the drainage path indicated by multiple thick arrows.

[0046] With the pipe cleaning and drainage equipment 60 described above, the standpipe 30 and the large-volume drain valve 40 are connected via a bayonet-type coupling fitting 1, thus significantly reducing accidents such as those that occur with conventional equipment. Moreover, because the direction of the drainage path from the large-volume drain valve 40, standpipe 30, large-diameter elbow 35, recoil reduction pipe 72, flexible hose 74, and drain nozzle 76 can be freely adjusted, large-volume drainage work can be performed quickly and safely.

[0047] Furthermore, since the crank-shaped recoil-reducing pipe 72 is installed between the standpipe 30 and the hose 74, the pressure that causes the hose 74 to try to return to its original shape due to internal pressure can be distributed and reduced, and the bending stress applied to the joint between the standpipe 30 and the large-volume drain valve 40 can be reduced, thereby preventing the standpipe 30 from detaching. Depending on the site conditions, the large-diameter elbow 35 may be replaced with a small-diameter elbow 36. The pipe cleaning and drainage equipment 60 can also be applied to cleaning work in areas such as water pipes, sewer pipes, and manholes.

[0048] Furthermore, the various inventions described above may be modified or altered as appropriate without departing from their respective spirits. [Industrial applicability]

[0049] According to the coupling fitting of the present invention, after inserting the insert fitting coaxially into the inside of the receiving fitting, a strong bayonet-type coupling state is quickly, easily, and safely obtained by rotating either fitting along the circumferential direction, which creates individual insertion (fitting) states with multiple locking pins and the same number of insertion holes, and individual clamping states with multiple locking protrusions and the same number of grooves. [Explanation of symbols]

[0050] 1. Connecting fittings 2. Mounting bracket 3 Main unit 4 Hollow part (inside) 5 Tsuba (sword guard) 6. Recessed groove 7 Steps 8. Wide side 9 Insertion hole 10 recesses 12 grooves 14 Gasket 20 Insertion fittings 20h, 24h tip 21 Locking protrusion 22 Passage section 23, 27 brackets 24 locking pins 25 clasp 26 Pin Operation Section 28. Coil spring (elastic material) 30 Standpipes 31 Pipe body 32 Elbow connector fittings 33 Outlet 34 Connection part 35 Large diameter elbow 35T expanded diameter part 36 Small diameter elbow 37, 38 Curved section 39D, 39d water discharge section 40. Large-volume drain valve 40a Ball pusher 42 Valve body 43 Lifting axis 44 Valve body 45 valve seats 46 Discharge pipe 47 Lid plate 48. Sealant 49 Male threaded rod 50 Covers 51 Lid 52 Valve opening / closing shaft 53 Nut body 54 Fittings 55 Air valve 55a Exhaust port 55b Outer shell 55f Lid (Cover) 56 Cylindrical body 57 Umbrella-shaped float 57a Slope 57b recess 58 Guide 58a Bottom hole 58b Side hole 59 Floats 60. Equipment for pipe cleaning and drainage work 62 Excavated trenches 64 Ground 66 Drainage tank 70 Water supply pipes 70a branch pipe 71 Repair valve 72 Recoil reduction tube 74 Hose 76 Drain nozzle 77 Leg ground contact part 78 Drain D Inner diameter L Lift amount

Claims

1. It is a connecting fitting consisting of a fitting and a receiving fitting that are connected to each other coaxially. Multiple locking protrusions are provided on the outer circumferential surface of the aforementioned fitting, and each of the locking protrusions has a locking pin that penetrates the locking protrusion in the axial direction and extends toward the opposing receiving fitting side by an elastic material. A coupling fitting wherein the end face of the receiving fitting facing the inserting fitting is provided with a plurality of recesses along the circumferential direction of the end face that individually allow the passage of the locking projection, and between each of the recesses, one of the plurality of wide sides is individually positioned, and an insertion hole is individually positioned in the wide side for receiving the tip of the locking pin and which enters towards the tip side of the position of the locking projection when the inserting fitting or the receiving fitting is rotated in the circumferential direction, and a groove for receiving the locking projection is individually positioned directly below the wide side.

2. The coupling fitting according to claim 1, wherein the plurality of locking protrusions are provided at equal intervals along the circumferential direction on the outer surface of the insertion fitting, and the plurality of recesses and the plurality of wide edges are provided at equal intervals on the end face of the receiving fitting.

3. The coupling fitting according to claim 1, wherein an annular packing can be sandwiched between the inner circumferential surface of the receiving fitting and the outer circumferential surface of the tip side of the inserting fitting.

4. A standpipe having the coupling fitting described in claim 1 at its inlet.

5. The standpipe according to claim 4, wherein the outlet of the standpipe is a separable elbow, and the elbow is connected by a coupling method that allows for flexible mounting direction using various couplings.

6. A large-volume drain valve having the coupling fitting described in claim 1 at its outlet.

7. An air valve with a ball pusher, wherein the coupling fitting described in claim 1 is provided at the outlet.

8. The large-volume drain valve according to claim 6, wherein the lift amount of the valve body in the large-volume drain valve is equal to or greater than the inner diameter of the discharge pipe constituting the large-volume drain valve.

9. A pipe cleaning and drainage device comprising the standpipe described in claim 4 and either the large-volume drain valve described in claim 6 or the air valve with a ball pusher described in claim 7.

10. The pipe cleaning and drainage equipment according to claim 9, further comprising the standpipe according to claim 5 and the large-volume drain valve according to claim 8.

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