Connecting fittings, standpipes using the same, large-volume drain valves, air valves with cones, and equipment for pipe cleaning and drainage work equipped with the standpipe and the large-volume drain valve or the air valve with cones

Abstract

To provide a metal coupling which can prevent accidental separation from each other and can be used safely, quickly and easily. [Solution] A connecting fitting 1 consists of a slot 20 and a receiving fitting 2 that are connected coaxially, with multiple locking projections 21 protruding from the outer surface of the slot 20 in the circumferential direction, and each locking pin 24 is individually positioned on each locking projection 21, penetrating the locking projection 21 along the axial direction and extending toward the receiving fitting 2 via an elastic material, with multiple recesses 10 formed on the end face of the receiving fitting 2 facing the slot 20, and one of the multiple wide side portions 8 is individually positioned between each pair of recesses 10, and each wide side portion 8 has an insertion hole 9 that can receive the tip end 24h of the locking pin 24 and enters toward the tip end 20h beyond the position of the locking projection 21 when the slot 20 is rotated in the circumferential direction, and directly below each wide side portion 8, a recessed groove 12 that can receive the locking projection 21 is individually positioned.

Description

[Technical Field]

[0001] The present invention relates to a connecting fitting, a standpipe using the same, a large-volume drain valve, an air valve with a cone, and a pipeline cleaning and drainage work device that is equipped with the standpipe and the large-volume drain valve or the air valve with a cone. [Background technology]

[0002] For example, the connecting fittings of equipment used in the pipe cleaning and drainage work carried out after the installation of large-diameter water supply pipes require a connecting strength that can withstand large flow rates and large internal pressures, as well as a connecting structure that allows for quick and easy attachment and detachment.

[0003] Regarding such connection structures, plug-in metal fittings specified in JIS B 9911 (see Non-Patent Document 1) are widely used to connect devices together. These plug-in metal fittings are widely used for devices connected to waterworks, including firefighting equipment, and are easy to obtain and attach / detach. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] JIS B 9911-1968 Dimensions of plug-in type couplings for fire hoses Summary of the Invention [Problem to be solved by the invention]

[0005] However, there have been reports of the aforementioned plug-in fittings separating and becoming detached when water is passed through them. Because the retaining force is maintained by the protruding force of the resilient claws that protrude into the circumferential groove of the plug, there is a problem in that the retaining force can be weakened by vibrations and pressure from the internal fluid, or deformation and wear of the retaining claws and plugs due to repeated use, leading to separation.

[0006] The present invention aims to solve the problems of the plug-in fittings mentioned above, and to provide connecting fittings that are safer, quicker and easier to use, which prevent accidents where the locking force is reduced due to the force of the internal fluid or deformation or wear of the locking claws or plug fittings due to repeated use, and to provide standpipes, large-volume drainage valves and air valves with ball pushers that use these, as well as equipment for pipe cleaning and drainage work that includes the standpipe and the large-volume drainage valve or the air valve with ball pusher. [Means for solving the problem]

[0007] In order to solve the above problems, the fitting of the present invention comprises: A coupling fitting consisting of a insert fitting and a receiving fitting that are coaxially connected to each other, A plurality of locking projections are provided on the outer peripheral surface of the insert metal member along the circumferential direction, and lock pins are individually disposed on the locking projections, which pass through the locking projections along the axial direction and extend toward the opposing receiving metal member via an elastic member. The end surface of the receiving fitting facing the insert fitting is provided with a plurality of recesses along the circumferential direction of the end surface, which individually allow the locking protrusions to pass through, and one of the plurality of wide side portions is individually located between each of the recesses, and the wide side portion receives the tip end of the lock pin and, when the insert fitting or the receiving fitting is rotated in the circumferential direction, , the tip of the lock pin is Insertion holes are individually arranged so as to extend further toward the tip end than the positions of the locking projections, and recessed grooves for receiving the locking projections are individually positioned directly below the wide side portions.

[0008] The plurality of locking projections are provided at equal intervals along the circumferential direction on the outer circumferential surface of the insert, and the plurality of recesses and and complex number of The aforementioned The wide side portions may be provided at equal intervals on the end surfaces of the receiving fixtures.

[0009] An annular packing may be sandwiched between the inner peripheral surface of the receiving metal fitting and the outer peripheral surface of the tip end of the insert metal fitting.

[0010] The present invention also includes a standpipe having the above-described coupling fitting at its inlet.

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

[0012] The present invention also includes a large-volume drain valve having the above-mentioned coupling fitting at its outlet.

[0013] The present invention also includes an air valve with a cone, which has the above-mentioned connecting fitting at its outlet.

[0014] The large-volume discharge valve may have a valve element lift amount equal to or greater than the inner diameter of a discharge pipe that constitutes the large-volume discharge valve.

[0015] The present invention also includes a pipeline cleaning and drainage work device equipped with the standpipe and either the large-volume drain valve or the air valve with a cone.

[0016] The standpipe and the large-volume drain valve may be provided as equipment for pipe cleaning and drainage work. [Effects of the Invention]

[0017] According to the coupling fitting of the present invention, when the insert is coaxially inserted (pushed) into the receiving fitting, the locking protrusions of the insert are individually passed through the recesses of the receiving fitting, and one of the fittings is then slightly rotated circumferentially relative to the other fitting. As a result, the locking pins on the insert slide along the upper surfaces of the wide sides of the receiving fitting under the pressure of the elastic material, then individually enter the insertion holes from the upper surfaces of the wide sides and reach a position deeper than the bottom of the recessed grooves. As a result, the wide sides of the receiving fitting are secured axially, radially, and circumferentially by the locking pins and locking protrusions on the insert, forming a strong bayonet-type connection. Therefore, a strong connection can be quickly and easily achieved, even when high-pressure fluid is passed through the interior at any time or sequentially. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view showing the insert and receiving fittings that constitute the connecting fitting of the present invention. [Figure 2] A side view showing the insert and a vertical cross-sectional view showing the receiving bracket. [Figure 3] (A) is a plan view showing the positional relationship for inserting the insert fitting into the receiving fitting, and (B) is a side view of the insert fitting along the arrow BB in (A) and a vertical cross-sectional view of the receiving fitting. [Figure 4] (A) and (B) are plan views showing the state in which the insert fitting inserted inside the receiving fitting is rotated sequentially along its circumferential direction, and (C) is a vertical cross-sectional view of the connecting fitting showing the state along the arrow CC in (B) after the rotation operation. [Figure 5] A side view showing a standpipe with a fitting attached to the inlet at its lower end and two types of elbows that can be connected to its outlet. [Figure 6] A vertical cross-sectional view showing a large-volume drain valve with a coupling attached to the outlet of a drain pipe. [Figure 7] (A) and (B) are schematic diagrams showing the installation of a large-volume drain valve or an air valve with a cone. [Figure 8] 1 is a partial vertical cross-sectional view showing an air valve with a cone used in the present invention and its vicinity. [Figure 9] 1 is a schematic diagram showing the configuration of a pipe cleaning and drainage work equipment including a coupling fitting, a standpipe, and a large-volume drainage valve. DETAILED DESCRIPTION OF THE INVENTION

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

[0020] As shown in Figures 1 and 2, the receiving fitting 2 has a cylindrical hollow portion (inside) 4 inside a cylindrical main body 3. An annular flange 5 extends centripetally toward the axis from the lower end of the hollow portion 4, and above this is located a horizontally recessed groove 6 that is entirely annular and has a rectangular vertical cross section. A gasket 14 that is entirely annular and has a circular vertical cross section is fitted in the recessed groove 6. Above the recessed groove 6, a horizontal, ring-shaped, flat step 7 is located along the entire circumference of the inner surface of the hollow portion 4.

[0021] Three (plural) wide side portions 8 are equally spaced from one another along the circumferential direction of the upper end surface of the receiving bracket 2, protruding toward the shaft core. A groove 12, opening toward the hollow portion 4, is located between each wide side portion 8 and the step portion 7. An upward-opening insertion hole 9 is located in the circumferential center of each wide side portion 8 and each groove 12. The insertion hole 9 penetrates the center of each wide side portion 8 and terminates at a hemispherical bottom just below the bottom of the center of each groove 12. Three (plural) recesses 10, each consisting of a narrow upper end surface, are equally spaced from one another between every three wide side portions 8. These recesses 10 are used to insert locking protrusions 21 on the insert bracket 20, as described below. The number of wide side portions 8, insertion holes 9, grooves 12, and locking protrusions 21 may be equal to or greater than four.

[0022] As shown in Figures 1 and 2, the insert 20 has three (a plurality of) generally arc-shaped locking projections 21 protruding at equal intervals from the cylindrical outer surface. A circular passing section 22, as viewed from above, is disposed at the circumferential center of each locking projection 21. Three long lock pins 24, each extending along the axial direction of the insert 20 and the pipe body 31 of the standpipe 30 (described later) coaxially welded to the upper side of the insert 20, can pass through the passing section 22 individually. Note that the passing sections 22 are not limited to the illustrated form in which a pair of arc surfaces are formed symmetrically along the circumferential (longitudinal) direction of the locking projection 21, but may instead be formed as a pair of flat surfaces that are approximately symmetrical along the radial direction on the locking projection 21.

[0023] The lock pin 24 penetrates brackets 23, 27 protruding from the outer periphery of the pipe body 31 so as to move forward and backward along the axial direction of the insert 20 and the axial direction of the pipe body 31 of the standpipe 30. It is secured by a stopper 25 located between them. The upper end of the lock pin 24 penetrates a coil spring 28 and is connected to a pin operating portion 26. When not in use, the coil spring 28 is compressed along the axial direction. For example, by releasing a restraining means (not shown) that fixes the position of the stopper 25 and freeing it downward, the coil spring 28 can expand along the axial direction. That is, when not in use, the coil spring 28 is biased to expand downward. The coil spring 28 may be replaced with a band- or string-shaped elastic material made of synthetic rubber or the like that can achieve a similar function. The coil spring 28 may also be configured to retract toward its tip (toward the receiving bracket 2) when not in use.

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

[0025] Next, the joining process between the bracket 2 and the insert 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 bracket 2 shown by the solid line is fixed, and the insert 20 shown by the dashed line is movable. First, as shown in Figure 3(A), the bracket 2 and the insert 20 are positioned coaxially so that the locking protrusions 21 of the insert 20 are positioned directly opposite each other in the recesses 10 of the bracket 2.

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

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

[0028] Next, as shown by the thick, dashed, curved arrow in Figure 4(B), the insert 20, which is coaxially inserted into the hollow portion 4 of the receiving bracket 2, is further rotated slightly clockwise. As a result, as shown in the figure, the tips 24h of the locking pins 24 on the insert 20 move onto the upper surfaces of the respective wide sides 8 on the receiving bracket 2, and then slide along the upper surfaces of the respective wide sides 8 before being individually and simultaneously inserted into the respective insertion holes 9 on the receiving bracket 2. The total rotation angle of the insert 20 in the rotation operation between Figures 3(A) to 4(A) and (B) is 60 degrees. If there are four wide sides 8, insertion holes 9, recesses 10, grooves 12 on the receiving bracket 2, and four locking projections 21 and locking pins 24 on the insert 20, the total rotation angle is 45 degrees.

[0029] 4(C), the lock pins 24 on the side of the insert 20 are individually inserted into the insertion holes 9 of the receiving fitting 2, and the locking projections 21 on the side of the insert 20 are individually clipped into the grooves 12 of the receiving fitting 2, thereby firmly coupling the receiving fitting 2 and the insert 20 coaxially in all directions, axially, circumferentially, and radially, and quickly and easily forming the bayonet-type coupling fitting 1. Moreover, the gap between the main body 3 of the receiving fitting 2 and the outer peripheral surface of the insert 20 is sealed by the packing 14, making it possible to maintain a good coupled state.

[0030] The aforementioned pushing and rotating operations may be performed in the following order: with the insert 20 in a fixed state, the receiving bracket 2 is pushed in and then rotated. To release the connecting bracket 1, the pin operating portion 26 is operated to release the restraining means of the stopper 25, and then the aforementioned rotating and pulling operations are performed in the opposite direction. Furthermore, multiple insertion holes 9 may be formed at equal intervals at any intermediate position in the circumferential direction on each wide side portion 8, and multiple lock pins 24 may also pass through any intermediate position in the circumferential direction on each engaging projection 21 at equal intervals. Additionally, the outer periphery of the lock pin 24 and coil spring 28 on the insert 20 side may be covered with a protective cover within the range of the height of the pipe body 31.

[0031] 5 is a side view showing a standpipe 30 with the above-mentioned 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 stud 20 is fixed to the inlet at the lower end of the pipe body 31 of the standpipe 30, and multiple lock pins 24 and the like are arranged along the outer periphery of the pipe body 31. Meanwhile, a receiving fitting 2 is fixed to the outlet (upper end) of an underground fire hydrant (not shown). Multiple elbow connecting fittings 32 are arranged symmetrically in a plan view on the outlet 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 discharge port 33 at the upper end of the pipe body 31. The large-diameter elbow 35 has an expanded-diameter section 35T and a large-diameter curved section 37 between a connecting section 34 having the same inner diameter as the discharge port 33 of the pipe body 31 and a water-discharge section 39D having a larger inner diameter than the connecting section 34. On the other hand, the small-diameter elbow 36 has a connecting section 34, a curved section 38 having the same inner diameter as the connecting section 34, and a water-discharge section 39d. The large-diameter elbow 35 and the small-diameter elbow 36 are connected to the discharge port 33 of the pipe body 31 using a coupling method that allows them to be attached (extend) in any direction when viewed from above.

[0033] When performing water discharge operations in the event of a fire, the elbow connector 32 is first operated to connect either the large-diameter elbow 35 or the small-diameter elbow 36 to the outlet 33 of the pipe body 31, and the standpipe 30, with the insert 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 bracket 2 attached to its outlet. As described above, the insert 20 is then pushed into the hollow portion 4 of the receiving bracket 2, and the pipe body 31 of the standpipe 30, with the spring pressure of each lock pin 24 released, is then rotated to form the bayonet-type connecting bracket 1. As a result, even in an emergency, a strong connection can be quickly and easily achieved between the underground fire hydrant, standpipe 30, and the large-diameter elbow 35 or small-diameter elbow 36, contributing to effective water discharge firefighting activities.

[0034] 6 is a vertical cross-sectional view showing a large-volume drain valve 40 with a coupling fitting 1 attached to the outlet (upper end) of a drain pipe 46. As shown, 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 a waterworks pipe 70 (described later), a ring-shaped valve seat 45 attached along the lower end of the inner circumferential surface of the valve body 42, a valve element 44 with a three-layer structure that freely rises and falls inside the valve body 42, an elevator shaft 43 attached to the lower end of the valve element 44 and that rises and falls inside the valve body 42, a drain pipe 46 that is generally L-shaped in side view and communicates laterally with the inner circumferential surface of the valve body 42, and a disk-shaped cover plate 47 that covers the upper end of the valve body 42. A receiving fitting 2 of the coupling fitting 1 is coaxially fixed to the outlet on the upper end of the drain pipe 46.

[0035] The lifting shaft 43 passes through the center of the cover plate 47 via a sealant 48 so as to be able to move up and down vertically. A male threaded rod 49, not shown, having a male thread engraved on its outer periphery, is connected to the upper side of the lifting shaft 43. The male threaded rod 49 is surrounded by a cylindrical cover 50 and passes upward while threadedly engaging with a female threaded hole (not shown) in a nut body 53 attached to the upper side of the inner periphery of the cover 50. A valve opening / closing shaft 52 is fixed to the upper end of the male threaded rod 49, and a lid portion 51 is formed on the bottom side of the valve opening / closing shaft 52, connecting to the upper end of the cover 50. A large-diameter handle (not shown) is attached to rotate the valve opening / closing shaft 52.

[0036] The lift (up-and-down) amount L of the valve element 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 to lift the valve element 44, along with the male threaded rod 49 and the lifting shaft 43, away from the valve seat 45, as shown by the dashed arrow in FIG. 6. As a result, the large amount of tap water that has flowed into the valve body 42 from the branch pipe 70a side passes forcefully and smoothly through the inside of the bayonet-type coupling fitting 1, including the drain pipe 46 and the receiving fitting 2, and is drained to the outside. Therefore, the lifting and lowering operation of the valve element 44 makes it possible to quickly and safely drain a large amount of water in an emergency.

[0037] FIG. 7(A) is a schematic diagram showing the placement of a repair valve 71 and an air valve 55 above a branch pipe 70a erected from a waterworks pipe 70. During normal times when large-volume drainage is not being performed, an air valve 55 with a lid (cover) 55f is connected to the upper side of the repair valve 71. FIG. 7(B) is a schematic diagram showing the installation of a large-volume drainage valve 40 or an air valve 55 with a cone pusher 40a. When using the large-volume drainage valve 40, the air valve 55 is removed and the large-volume drainage valve 40 is connected to the upper side of the repair valve 71, and drainage is performed. Note that in FIG. 7(B), the large-volume drainage valve 40 is connected without removing the repair valve 71.

[0038] The dashed arrow in Figure 7(B) shows a form in which the large-volume drain valve 40 is connected to the upper side of the repair valve 71. However, this is not limiting, and the process of installing an air valve 55 with a cone 40a in a different embodiment is shown by the solid arrow in Figure 7(B). As shown in the figure, first, the lid (cover) 55f covering the top of the air valve 55 connected to the upper side of the repair valve 71 is removed. Next, a cone 40a, whose internal valve structure and valve function differ from those of the large-volume drain valve 40, is connected to the upper side of the air valve 55. Below, a different embodiment of the present invention using an air valve 55 with a cone 40a will be described, focusing mainly on the differences from the large-volume drain valve 40.

[0039] FIG. 8 is a partial vertical cross-sectional view of the air valve 55 with the cone pusher 40a and its vicinity, and a schematic diagram illustrating their operation. The air valve 55 is designed to prevent a sudden increase in pressure by preferentially exhausting air that rises with the water supplied through the waterworks pipe 70, branch pipe 70a, and auxiliary valve 71. In place of the valve body 44, the cone pusher 40a uses a lifting shaft 43 with a downward-opening cylindrical body (cone) 56, made of, for example, polyvinyl chloride (PVC), bolted to its lower end. The lower end of the lifting shaft 43 has an exhaust hole 55a penetrating it. The exhaust hole 55a is located in the center of the joint 54 between the cone pusher 40a and the air valve 55. The lifting shaft 43 is integrally fixed to the nut body 53 via the upper male threaded rod 49. In other words, the exhaust hole 55a is always open. Other than these differences, the cone pusher 40a is the same as 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, an umbrella-shaped float 57, which is a hollow disk, and a spherical float 59 are arranged vertically. The umbrella-shaped float 57 has a ring-shaped inclined portion 57a ​​on its upper surface, which slopes downward at an angle, and a curved recess 57b on its bottom surface, which faces upward. The umbrella-shaped float 57 and the spherical float 59 are surrounded by a guide 58, which allows them to move only vertically. The guide 58 has a hemispherical bottom and a cylindrical middle and upper portions. It has a bottom hole 58a opening at the center of the bottom and multiple side holes 58b opening at the upper end of the side. The air valve 55 with the cone pusher 40a is composed of at least an exhaust hole 55a, an outer shell 55b, two floats 57 and 59, and the guide 58. Generally, a vent hole (not shown) is formed in the center of the umbrella-shaped float 57, passing through in the vertical direction, and vent holes are also formed in appropriate locations in the cylindrical body 56. The cylindrical body 56, umbrella-shaped float 57, and spherical float 59 may be connected to one another by screws, chains, or the like, not shown.

[0041] Next, the operation of the air valve 55 with cone pusher 40a will be explained with reference to Figure 8. When tap water is supplied to the branch pipe 70a that communicates with 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 two-dot chain arrows in Figure 8. At this time, air that is supplied with the tap water is generally preferentially discharged to the outside through the exhaust hole 55a. At this time, air that has entered between the two floats 57, 59 is also discharged from the exhaust hole 55a through the through-hole in the center of the umbrella-shaped float 57.

[0042] 6, the lift shaft 43, male threaded rod 49, and nut body 53 are fixed to one another, so the downward force acting on the two floats 57, 59 is greater than the buoyancy acting on them. As a result, as shown in the figure, tap water is delivered from the multiple side holes 58b in the guide 58 through the exhaust hole 55a to the valve body 42 and discharge pipe 46. Therefore, the air valve 55 with cone 40a reliably prevents a sudden rise in air pressure, enabling stable water delivery while saving labor. The valve float 57 and the spherical float 59 may be combined into a single float with the external shapes of both.

[0043] FIG. 9 is a schematic diagram showing the configuration of a pipe cleaning and draining device 60, including a coupling 1, a standpipe 30, and a large-volume drain valve 40. For example, if sediment or other foreign matter accumulates inside a waterworks pipe 70 due to aging or during a disaster such as heavy rain, it is necessary to quickly and easily remove the foreign matter. As shown in the figure, an excavation trench 62 is formed above the waterworks pipe 70 with sediment or other foreign matter accumulated inside. A large-volume drain valve 40 equipped with a bayonet-type coupling 1 is connected to the outlet of a discharge pipe 46 via a repair valve 71 above a branch pipe 70a extending upright from the waterworks pipe 70. A standpipe 30 with a lower insert 20 is connected to the upper end of the discharge pipe 46 for communication. The large-volume drain valve 40 may be replaced with an air valve 55 equipped with a cone pusher 40a. Alternatively, the air valve 55 may be removed and the large-volume drain valve 40 installed. It is also 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 between the branch pipe 70a and the air valve 55, and it can be easily configured, for example, by removing the top lid (cover) from a normal air valve and attaching a cone pusher 40a.

[0044] Specifically, the housing containing the air valve 55 is opened, and the repair valve 71 located between the air valve 55 and the branch pipe 70a is operated to stop the water flow, after which the cover 55f of the air valve 55 is removed. Next, the cone pusher 40a is attached to the air valve 55. The lifting shaft 43 is operated to bring the cylinder 56 into contact with the floats 57 and 59, which prevents the floats 57 and 59 from rising and ensures a clear flow path for tap water. Next, the standpipe 30 is attached to the discharge pipe 46, and the subsequent equipment is assembled. Finally, when preparations for draining are complete, the repair valve 71 is opened and the water is drained. When draining is complete, the repair valve 71 is closed, and the standpipe 30 and other components are removed in the reverse order, restoring the water to its original state.

[0045] A large-diameter elbow 35 and a recoil reduction pipe 72, which is generally crank-shaped in side view, are connected to the discharge port 33 at the upper end of the standpipe 30 in a generally inverted U-shape and can communicate with each other. As shown in FIG. 8 , the lower end of the recoil reduction pipe 72 is connected to and communicates with a hose 74 on the ground 64. A drain nozzle 76, which is generally inverted L-shaped in side view, is connected to the discharge end of the hose 74, and a drain outlet 78 of the drain nozzle 76 opens above a sewer or other drainage basin 66. The drain nozzle 76 is supported on the ground 64 via a leg-mounted portion 77. A dual-purpose transport handle (not shown) is attached to the leg-mounted portion 77 and extends symmetrically along the front-to-rear direction in FIG. 8 . A pump and a driving source, such as a generator or an engine-powered motor, are located somewhere along the drainage path indicated by multiple thick arrows in FIG. 9 .

[0046] According to the above-described pipeline cleaning and drainage work equipment 60, the standpipe 30 and the large-volume drain valve 40 are connected via a bayonet-type coupling 1, which significantly reduces the occurrence of separation accidents that have occurred in the past. Moreover, the direction of the drainage path extending from the large-volume drain valve 40, standpipe 30, large-diameter elbow 35, recoil reduction pipe 72, flexible hose 74, and drainage nozzle 76 can be freely adjusted, allowing for rapid and safe drainage of large volumes of water.

[0047] Furthermore, since the crank-shaped recoil reduction pipe 72 is installed between the standpipe 30 and the hose 74, the pressure that causes the hose 74 to return to its original shape due to internal pressure can be dispersed 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 coming off accidentally. The large-diameter elbow 35 may be replaced with a small-diameter elbow 36 depending on the situation at the site. The pipe cleaning and drainage work equipment 60 can also be used for cleaning, for example, recycled water pipes, sewer pipes, and the inside of manholes.

[0048] The present inventions described above can be appropriately changed or modified without departing from the spirit of each invention. [Industrial Applicability]

[0049] With the connecting fittings of the present invention, after inserting the insert fitting coaxially inside the receiving fitting, one of the fittings can be rotated circumferentially to quickly, easily, and safely obtain a strong bayonet-type connection state in which multiple lock pins are individually inserted (engaged) with the same number of insertion holes, and multiple locking protrusions are individually held in the same number of recessed grooves. [Explanation of symbols]

[0050] 1. Joint fittings 2 Bracket 3 Main unit 4 Hollow part (inside) 5 Tsuba 6 recessed groove 7 Steps 8 Wide side 9 Insertion hole 10 recess 12 Groove 14 Gasket 20 Insert 20h, 24h tip 21 Locking protrusion 22 Passage section 23, 27 Bracket 24 Lock pin 25 Clasp 26-pin operation unit 28 Coil spring (elastic material) 30 Standpipe 31 Pipe body 32 Elbow connecting fitting 33 Outlet 34 Connection 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 press 42 Valve body 43 Elevating axis 44 Valve body 45 Valve seat 46 Discharge pipe 47 Lid plate 48 Sealing material 49 Male threaded rod 50 Cover 51 Lid 52 Valve opening and closing shaft 53 Nut body 54 Joint 55 Air valve 55a Exhaust hole 55b Outer body 55f Lid (cover) 56 Cylinder 57 Umbrella float 57a Slope 57b Recess 58 Guide 58a Bottom hole 58b Side hole 59 Float 60 Pipeline cleaning and drainage equipment 62 Excavation trench 64 Ground 66 Drainage tank 70 Waterworks Pipe 70a branch pipe 71 Repair valve 72 Recoil reducer 74 Hose 76 Drain nozzle 77 Leg ground contact part 78 Drain D Inner diameter L lift amount

Claims

1. A coupling fitting consisting of a insert fitting and a receiving fitting that are coaxially connected to each other, A plurality of locking projections are provided on the outer peripheral surface of the insert metal member along the circumferential direction, and lock pins are individually disposed on the locking projections, which pass through the locking projections along the axial direction and extend toward the opposing receiving metal member via an elastic member. A connecting fitting in which the end face of the receiving fitting facing the insert fitting is provided with a plurality of recesses along the circumferential direction of the end face, each of which individually allows the locking protrusion to pass through, and one of the plurality of wide side portions is individually located between each of the recesses, and the wide side portions are individually provided with insertion holes that receive the tip end of the locking pin and through which the tip end of the locking pin enters further toward the tip side than the position of the locking protrusion when the insert fitting or the receiving fitting is rotated circumferentially, and directly below the wide side portions are individually located recessed grooves that receive the locking protrusions.

2. The connecting fitting described in claim 1, wherein the multiple locking protrusions are protruded at equal intervals along the circumferential direction on the outer peripheral surface of the insert fitting, and the multiple recesses and multiple wide side portions are each provided at equal intervals on the end surface of the receiving fitting.

3. 2. The coupling fitting according to claim 1, wherein an annular packing can be sandwiched between the inner peripheral surface of the receiving fitting and the outer peripheral surface of the tip end of the insert fitting.

4. A standpipe having the coupling fitting according to claim 1 at its inlet.

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

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

7. An air valve with a cone, comprising the coupling fitting according to claim 1 at its outlet.

8. 7. The large-volume discharge valve according to claim 6, wherein the lift amount of the valve element in the large-volume discharge valve is equal to or greater than the inner diameter of a discharge pipe that constitutes the large-volume discharge valve.

9. 8. A pipe cleaning and drainage work device comprising the standpipe according to claim 4 and either the large-volume drain valve according to claim 6 or the air valve with cone according to claim 7.

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

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