JP2016030981A - Water supply structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply structure capable of early restoring a service water main pipe by restraining labor required for restoration work of the service water main pipe, by surely cutting off water supply of service water, regardless of the existence of damage of the service water main pipe.SOLUTION: A water supply structure is connected to a water distribution facility having a service water main pipe connected to a water distribution basin, a gate valve arranged in the middle of the service water main pipe and a corporation cock connected to the middle of the service water main pipe. The water supply structure comprises a water supply pipe branched off from the service water main pipe via the corporation cock and extended toward the building side, and a meter box provided in the middle of the water supply pipe and storing a service water meter and a shutoff valve connected to the middle of the water supply pipe and closing a flow passage of the water supply pipe when exceeding predetermined seismic intensity, in which the shutoff valve is connected between the corporation cock and the meter box among the water supply pipe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water supply structure connected to a water main connected to a distribution reservoir via a water faucet.

  Patent document 1 is proposed as this kind of water supply structure. Patent Document 1 describes a technique in which a stop cock is connected to a middle portion of a water supply pipe connected to a water main through a water faucet.

  Patent Document 2 describes a technique in which a shut-off valve (emergency shut-off valve) is connected in the middle of a water pipe. This shut-off valve is configured so that the valve body moves in the direction to close the valve seat by utilizing the phenomenon that the flow rate of tap water passing through the shut-off valve increases when a water leakage accident occurs due to destruction of the water pipe. Yes.

  By the way, the water supply structure is connected to the water main connected to the distribution reservoir via a water faucet, branched from the water main via the water faucet and extended toward the building side. And a meter box containing a stop cock and a water meter connected in the middle of the water supply pipe.

  The water supply pipe is branched from the water main at least as much as the building, and in recent years, in particular, in a certain water supply area, a large number of water supply pipes are laid around.

  If the water main is damaged due to a disaster after the earthquake, recovery work will be carried out. Alternatively, recovery work is performed assuming damage to the water main. In such water mains restoration work, the downstream gate valve is closed and the upstream gate valve is opened, and water pressure is applied to the water main section between the upstream gate valve and the downstream gate valve. Inspect the water main for damage using means such as a water pressure gauge.

  If the water main is damaged, repair work (repair). If there is no breakage in the water main part, close the gate valve located further downstream, open the upstream gate valve, and open another valve between the downstream gate valve and the upstream gate valve. Investigate whether the water main is damaged.

  In the restoration work of the water main, the above work is sequentially repeated from the upstream side to the downstream side. Thus, in order to supply tap water again to each building after the occurrence of an earthquake, restoration of the water main is given the highest priority.

JP 2007-182940 A JP-A-6-129558

  By the way, the water supply pipe is branched from the water main through a water faucet. For this reason, in the water main part where a water faucet is connected between the upstream gate valve and the downstream gate valve, the water main part was examined for damage using a water pressure gauge, etc. However, it is unclear whether the damage is caused by water mains or water supply pipes.

  In such a case, in order to identify the damaged part, in the water supply structure of Patent Document 1, an operator must close the stop cock connected to the middle of the water supply pipe. However, as described above, in recent years, there is a present situation in which a large number of water supply pipes are laid around in a certain water supply area. Therefore, the number of stop cocks (the number of buildings) is increasing enormously, and a great deal of labor is required only by closing all the stop cocks. As a result, the restoration work of the water main will be delayed by that amount, and if the restoration work of the water main is delayed, it will take a lot of time before the water can be supplied to each detached house.

  The shut-off valve of Patent Document 2 utilizes a phenomenon in which the flow rate of tap water passing through the shut-off valve increases in the case of a water leakage accident due to destruction of the water pipe. For this reason, the shut-off valve does not work unless a large flow of tap water flows due to breakage of the water pipe. In addition, depending on the flow rate of tap water, the valve body may not move and the valve seat may not be closed. Moreover, since the restoration work of the water main is performed by the occurrence of an earthquake with a certain seismic intensity regardless of whether the pipe or the water pipe is damaged, the shut-off valve of Patent Document 2 is not used for the restoration work of the water main. It may not contribute.

  Therefore, in view of the above problems, the present invention can automatically and reliably shut off the supply of tap water regardless of whether or not the water main is damaged. The purpose is to provide a water supply structure that can restore pipes.

  A water supply structure of the present invention is a water supply structure connected to a water distribution facility comprising a water main connected to a water reservoir and a gate valve arranged in the middle of the water main, A water supply pipe branched from the water main through a water faucet connected to the building and extended toward the building side, a meter box provided in the middle of the water supply pipe and containing a water meter, and in the middle of the water supply pipe And a shutoff valve that closes the flow path of the water supply pipe when a predetermined seismic intensity is exceeded, and the shutoff valve is connected between the water faucet and the meter box in the water supply pipe. Yes.

  According to the above configuration, the tap water on the water supply pipe side is shut off by the operation of the shutoff valve regardless of whether the water main is damaged due to the occurrence of an earthquake exceeding a predetermined seismic intensity. There is no need to shut off water, and the shutoff valve is connected to a limited area between the water faucet and the meter box. To make it easier to investigate.

  In the water supply structure of the present invention, the shut-off valve can employ a configuration connected in the vicinity of the water faucet. According to the configuration in which the shutoff valve is connected in the vicinity of the water faucet, tap water can be shut off at the most upstream portion of the water supply pipe in the vicinity of the water faucet when an earthquake occurs. Therefore, it is possible to conduct a survey specialized in water mains only, and as a recovery operation when the water main is damaged, use a gate valve and investigate the water main in order from the upstream side. Early recovery of the tube is possible.

  In the water supply structure of the present invention, the shut-off valve can adopt a configuration connected in the vicinity of the primary side with respect to the meter box. Since the water supply pipe near the primary side of the meter box is easily damaged by an earthquake, a shutoff valve is connected near the primary side of the meter box to automatically shut off the water supply to each door. Can suppress water leakage.

  In the water supply structure of the present invention, the shutoff valve can be configured to be connected in the vicinity of the water faucet and in the vicinity of the primary side with respect to the meter box. By connecting the shut-off valve in the vicinity of the water faucet and in the vicinity of the primary side with respect to the meter box, it is easy to detect water leakage in the water supply pipe portion between the water main and the meter box.

  In the water supply structure of the present invention, the shutoff valve is connected to bend in the middle of the water supply pipe so as to have a height difference so that the secondary side water supply pipe is positioned higher than the primary side water supply pipe in a predetermined region. The structure connected to the primary side of the pipe joint can be adopted. A portion of the water supply pipe that has a difference in height due to the pipe joint is susceptible to vibration caused by the occurrence of an earthquake from multiple directions and is therefore easily damaged. For this reason, by arranging a shut-off valve on the primary side of the pipe joint and shutting off the tap water by the operation of the shut-off valve, the water main can be quickly restored.

  A shutoff valve used in the water supply structure of the present invention includes a valve box that houses a valve body, a drive mechanism unit that drives the valve body, and a power supply unit that drives the drive mechanism unit, and the power supply unit has a predetermined seismic intensity. An earthquake detector that detects only earthquakes that exceed, a battery that supplies power to the drive mechanism, and a drive power that is supplied from the battery to the drive mechanism only when a seismic intensity signal that exceeds a predetermined seismic intensity is output from the earthquake detector It is possible to employ a configuration including a control unit that performs control.

  In the above configuration, the seismic detector detects only earthquakes exceeding a predetermined seismic intensity, which does not require monitoring of the operating state at all times, and the seismic intensity signal exceeding the predetermined seismic intensity is output from the seismic detector. Drive power is supplied to the drive mechanism only when the battery is used, so that battery consumption is remarkably suppressed and long-term use is possible, and there is no need to use an external power supply. No wiring is required to electrically connect the shut-off valve.

  In the water supply structure of the present invention, the tap water on the water supply pipe side can be shut off by the operation of the shut-off valve regardless of whether the water main is damaged due to the occurrence of an earthquake exceeding a predetermined seismic intensity. There is no need to shut off tap water on the water supply pipe side, and the shutoff valve is connected to a limited area between the water faucet and the meter box in the water supply pipe. Because it becomes easy to investigate by specializing in the water main, the water main can be restored early.

1 is an overall view of a water distribution facility representing a first embodiment of the present invention. It is a general view showing the embedded state. It is principal part detail drawing of the state which installed the shut-off valve in the water faucet by the joint. It is principal part detail drawing of the state which installed the same shut-off valve coupling in a water faucet, and removed the water supply pipe. It is a partially broken horizontal sectional view in the state where the valve element of the shut-off valve was opened. It is a partially broken horizontal sectional view in the state where the valve body was closed. It is the longitudinal cross-sectional view showing the drive mechanism part. It is a top view showing the drive mechanism part. FIG. 8 is a longitudinal sectional view showing a drive mechanism portion in a direction orthogonal to FIG. 7. FIG. 10 is a cross-sectional view taken along line YY in FIG. 9. It is a longitudinal cross-sectional view of a state in which a drive mechanism is mounted on the valve box and an electronic component group is mounted on the drive mechanism. It is the whole view which looked at the same shut-off valve from the downstream. It is a partially broken longitudinal cross-sectional view showing the attachment state of the watertight cover. It is a longitudinal cross-sectional view of the state which assembled | attached the electronic component group to the 2nd case. It is a general view of the water distribution facility showing 2nd embodiment of this invention. It is a general view showing the embedded state. It is principal part detail drawing of the state which connected the shut-off valve to the water supply pipe by the joint. It is a general view of the water distribution facility showing 3rd embodiment of this invention. It is principal part detail drawing of the state which installed the shut-off valve in the water faucet by the joint. It is explanatory drawing showing the cutoff valve which concerns on other embodiment, and is explanatory drawing of the state which attached the manual operation handle. It is explanatory drawing of the state which removed the manual operation handle.

  Hereinafter, the water supply structure which concerns on one Embodiment of this invention is demonstrated with reference to FIG. 1 thru | or FIG. First, a first embodiment will be described with reference to FIGS. As shown in FIG. 1, the water supply structure K1 according to the present embodiment is laid so as to be connected to the secondary side (downstream side) of the water distribution facility K2.

  The water distribution facility K2 includes a water distribution reservoir W, a water main H that is connected to the water distribution reservoir W, and a gate valve B disposed in the middle of the water main H. Although not shown, a drainage prevention shutoff valve for preventing the water in the reservoir W from being depleted when an earthquake occurs is connected to the outlet of the reservoir W. The gate valve B is arranged away from the water reservoir W by a certain distance. In addition, the gate valve B is connected to a plurality of locations of one water main H, and the gate valves B are arranged at a predetermined interval.

  The water supply structure K1 is connected to the water main H through a water faucet D (for example, a water faucet with a saddle). The water supply structure K1 includes a water supply pipe 8 connected to the secondary side of the water main H by a water tap D, a first stop cock 5A, a second stop cock 5B connected in the middle of the water supply pipe 8, And a shut-off valve 1.

  As shown in FIGS. 2 and 3, the water faucet D is connected to the upper part of the water main H, and the water supply pipe 8 is branched from the upper part of the water main H. The water supply pipe 8 is buried at a predetermined depth on the public road R1, reaches the residential land R2, and rises upward by, for example, a curved pipe joint (hereinafter referred to as “elbow joint”) 10 when entering the residential land R2. Thus, the residential land R2 is buried at a position shallower than the predetermined depth, and further extended toward the building 9. In this way, the water supply pipe 8 is extended from the water faucet D to the faucet or the like of the building 9.

  The first stop cock 5A is arranged in the vicinity of the public road R1 in the residential land R2. The first stop cock 5A is a general stop cock. For example, a key-type ball stop cock is used, and the operation shaft 5a is rotated using a tool, so that the ball inside the valve box is rotated. Is done. The upper side of the first stop cock 5A is covered with a stop cock housing 5C. The first stop cock 5A has a case where a second stop cock 5B in the meter box 3 to be described later is arranged at a position far from the boundary between the public road R1 and the residential land R2, or a plurality of water supply pipes 8 are provided. And is used when introduced into a plurality of meter boxes 3. The first stop cock 5A is used so as to be closed when maintenance of the water supply structure K1 is performed.

  In the water supply pipe 8, a shut-off valve 1 is connected via a joint 2 in the vicinity of each water faucet D (secondary side position closest to the water faucet D). That is, the shut-off valve 1 is embedded in the public road R1, and specifically, the shut-off valve 1 is directly connected to the threaded portion 65 of each water faucet D. In this case, on the primary side of the joint 2, a flange 66 a formed integrally with the primary side of the valve box 11 of the shut-off valve 1, which will be described in detail later, and a cap nut 67 that can be locked to the flange 66 a. Used. On the secondary side, a male screw 66 formed integrally with the secondary side portion of the valve box 11 of the shut-off valve 1 and a female screw joint 68 screwed into the male screw 66 are used. The configuration of the shut-off valve 1 will be described in detail later, but is covered by a shut-off valve housing 5D. An operator can operate the shutoff valve 1 (operating a manual operation handle 44 described later) in the work space of the shutoff valve housing 5D. Further, the shutoff valve 1 can be replaced and maintained.

  The meter box 3 is laid on the building 9 side in the residential land R2 with respect to the first stop cock 5A. An intermediate portion of the water supply pipe 8 is inserted into the meter box 3. The water supply pipe 8 is adjusted so as to be buried in a position raised to the height corresponding to the installation height of the meter box 3 before reaching the meter box 3.

  In the meter box 3, the second stop cock 5 </ b> B and the water meter 6 are arranged in order from the upstream side to the downstream side, and the second stop cock 5 </ b> B and the water meter 6 are connected to the water supply pipe 8. Yes. The water supply pipe 8 led out from the meter box 3 to the secondary side is further extended toward the building 9, and the faucet in the building 9 is connected to the secondary side end of the water supply pipe 8. The second stop cock 5B is a general stop cock, for example, a ball stop cock with a check valve.

  As shown in FIGS. 7 to 14, the shut-off valve 1 is an electric valve configured such that the valve body 13 closes the water supply pipe 8 when the drive mechanism unit 20 is driven by a predetermined signal, and has a predetermined seismic intensity. It is an emergency shut-off valve that shuts off water supply to each building 9 when an earthquake occurs.

  The shut-off valve 1 includes a valve box 11 that is a part of a water supply pipe, a valve body 13 that is housed in the valve box 11, and a valve shaft 19 that is external to the valve box 11 and connected to the valve body 13. And a drive mechanism section 20 for opening and closing the valve body 13 in the valve box 11 and a power supply section 21 having a plurality of electronic components for driving the drive mechanism section 20. A water supply passage 14 that is opened and closed by a valve body 13 is formed inside the valve box 11.

  The drive mechanism unit 20 is accommodated (assembled) inside the first case 22 that is a drive unit housing, and the drive mechanism unit 20 and the first case 22 constitute a drive unit 22A. ing. The power supply unit 21 is housed (assembled) inside the second case 23, which is a power supply unit housing, separately from the first case 22, so that the power supply unit 21 and the second case 23 are assembled. Are the power supply unit 23B. The first case 22 is disposed on the valve box 11 side, and the second case 23 is detachably attached to the upper surface of the first case 22.

  As shown in FIGS. 7 and 8, the first case body 24 in the first case 22 includes a bottom wall 25 that is rectangular in plan view, and a side wall 26 that is erected from four sides of the bottom wall 25. Thus, it is formed in a rectangular parallelepiped shape with the upper portion as an open portion 27. The opening 27 is covered with a plate-like lid 28. The first case body 24 and the lid body 28 are assembled through a seal member m1. The bottom wall 25 is placed on the upper surface 11a of the valve box 11, and the first case 22 is placed on the upper surface 11a by a bolt 67 inserted from the inside of the first case 22 into the bottom wall 25 and the upper surface 11a of the valve box 11. It is detachably attached. The bottom wall 25 and the upper surface 11a are attached via a seal member m2. An insertion hole 29 through which the valve shaft 19 is inserted is formed in the bottom wall 25.

  The lid 28 is formed in a rectangular shape, and includes a rectangular receiving plate 30 and a support frame 34 erected from four sides. As shown in FIG. 14, the receiving plate 30 is formed with a fitted portion 32 into which a fitting portion 31 of a second case 23 described later is fitted. The fitted portion 32 is disposed on one side of the lid body 28 (on the right side in FIG. 7). The fitted portion 32 is formed in a cylindrical shape, and is formed so as to protrude downward and upward with respect to the plate surface of the lid body 28. A driven bevel gear 33 that is a driven transmission portion is disposed directly below the fitted portion 32. A seal member m <b> 3 is fitted to the outer peripheral surface portion of the support frame 34.

  The configuration of the drive mechanism unit 20 will be described with reference to FIGS. The drive mechanism unit 20 includes a gear mechanism 35 having a driven bevel gear 33, a worm 36 coupled to the gear mechanism 35, a helical gear 37 meshing with the worm 36, and a clutch mechanism 38 coupled to the worm 36.

  The gear mechanism 35 includes a driven bevel gear 33 and a plurality of spur gears 39 for changing the gear ratio of the driven bevel gear 33. The driven bevel gear 33 rotates around the central axis in the direction along the short direction S, which is a direction orthogonal to the virtual flow path direction center 4, and the shaft portion 40 is a spur gear. One spur gear 39 is configured to mesh with the shaft portion 40. The worm 36 is externally fitted and fixed to a main shaft 41 whose longitudinal direction is the short direction S. The worm 36 is disposed in the middle of the main shaft 41 in the axial direction.

  A plurality of support columns 42 are erected from the upper surface of the bottom wall 25 of the first case 22, and a bottom wall 43 </ b> A of a bracket 43 having a U-shaped cross section with the upper side open is supported by the support column 42. Both ends of the main shaft 41 in the axial direction are rotatably supported by the vertical wall 43B of the bracket 43. The helical gear 37 rotates around the valve shaft 19 and is formed in a fan shape in plan view.

  The clutch mechanism 38 is connected to the front end side of the main shaft 41 (the end side opposite to the gear mechanism 35). In the main shaft 41, a handle shaft 45 to which a manual operation handle 44 (see FIGS. 12 and 13) is connected is further connected to the distal end side of the clutch mechanism 38. The handle shaft 45 is fitted in the side wall 26 of the first case 22 in a mounting portion 46 formed so as to protrude in the short direction S, and a seal member m4 is provided in the middle of the handle shaft 45 in the axial direction. It is fitted. Further, the manual operation handle 44 capable of rotating the handle shaft 45 outside the first case 22 is fixed to the handle shaft 45. And even if it is manual, it is comprised so that the valve body 13 can be opened and closed via the clutch mechanism 38 by rotating the manual operation handle 44 to a predetermined rotation direction.

  As shown in FIG. 9, the upper part of the valve shaft 19 is inserted into the insertion hole 29, and a seal member m <b> 5 is externally fitted to an intermediate portion in the axial direction of the valve shaft 19 that is inserted into the insertion hole 29. In the valve shaft 19, the portion inserted through the insertion hole 29 and inserted into the first case 22 is formed such that the upper portion has a smaller diameter than the lower portion via the stepped surface 19 a. The center portion of the helical gear 37 is inserted up to the stepped surface 19a, and the helical gear 37 is secured from the valve shaft 19 by retaining means. The retaining means includes an arm-shaped pressing member 47 extending over the upper surface of the valve shaft 19 and the upper surface of the helical gear 37, and a mounting bolt 48 for fixing the pressing member 47 to the upper end surface of the valve shaft 19. A mounting bolt 48 is inserted through the presser member 47 and screwed into the upper end surface of the valve shaft 19.

  As shown in FIGS. 8 and 9, the pressing member 47 is formed in a hook shape extending in a horizontal plane (above the main shaft 41) without contacting the main shaft 41 and the worm 36. The pressing member 47 is configured to be rotatable together with the helical gear 37 around the center of the helical gear 37 (which is also the center of the valve shaft 19) within a range where the tooth portion 37A is formed. More specifically, as will be described later, it is configured to be rotatable within a range in which the tooth portion 37A is formed within the time for driving the DC motor 49. A permanent magnet M is attached to the top surface of the tip of the pressing member 47.

  As shown in FIGS. 11 to 14, the second case 23 is detachably attached to the lid 28 of the first case 22. The second case 23 includes a bottom wall 23A that is rectangular in plan view and a covering 50 that covers the bottom wall 23A from above. The bottom wall 23A and the covering body 50 are assembled via a seal member m6. On the bottom wall 23A, the fitting portion 31 that fits in the fitted portion 32 is formed. The fitting portion 31 is formed in a cylindrical shape and protrudes downward with respect to the wall surface of the bottom wall 23A. A seal member m <b> 7 is fitted on the outer peripheral surface of the fitting portion 31. In the center of the bottom wall 23A surrounded by the fitting portion 31, an insertion hole 52 through which a drive shaft 51A of a drive bevel gear 51, which is a drive transmission portion described later, is inserted is formed. The drive shaft 51A is an axis along the vertical direction.

  The power supply unit 21 is housed in the second case 23. The power supply unit 21 includes, as electronic components, a DC motor 49, two primary batteries 55 and 55 for supplying power to the DC motor 49, an earthquake detector 53 that detects only earthquakes having a predetermined seismic intensity, and an earthquake And a set of control boards (not shown) having a function of controlling power supply from the primary batteries 55 and 55 to the DC motor 49 by inputting seismic intensity signals from the detector 53. As the earthquake detector 53, a seismometer (also referred to as a seismometer) is used instead of an acceleration sensor because only an earthquake having a predetermined seismic intensity or higher is detected.

  In this case, the predetermined seismic intensity detected by the earthquake detector 53 is set to the same seismic intensity as the depletion prevention cutoff valve provided in the reservoir W. Although not shown, the control board is disposed between the primary batteries 55 and 55 and the back side wall of the second case 23 so as to stand upright along the primary batteries 55 and 55. The drive transmission unit includes a drive bevel gear 51 and a DC motor 49.

  Furthermore, the second case 23 includes a magnetic sensor that reacts with the magnetic force of the permanent magnet M and an LED. This magnetic sensor detects that the presser member 47 has rotated when it corresponds to the permanent magnet M in the vertical direction. By this detection, a lighting or flashing signal is output to the LED via the control circuit of the control board so as to notify the open / closed state of the valve body 13.

  Among these electronic components, the DC motor 49 is not restricted in terms of the arrangement of other electronic components, although it is regulated to be arranged above the driven bevel gear 33. In the present embodiment, the DC motor 49, the primary batteries 55 and 55 (control board), and the earthquake detector 53 are arranged in the short direction S in this order. However, the order of arrangement of the electronic components and the arrangement position in the vertical direction are not particularly limited.

  As shown in FIGS. 12 to 14, the second case 23 is covered with a watertight cover 56 from above in order to ensure watertightness with respect to the power supply unit 21. The watertight cover 56 is formed in a box shape with the lower side opened. The four side walls 56B of the watertight cover 56 are configured to be fitted to the seal member m3 fitted to the support frame 34 of the lid 28 from the outside.

  The watertight cover 56 includes a top wall 56 </ b> A, and the watertight cover 56 is configured such that the back surface of the top wall 56 </ b> A comes into contact with the upper surface of the second case 23 when fitted to the support frame 34 of the lid 28. ing. Further, the watertight cover 56 is provided with an attachment rod 57 for fixing it so as not to be easily removed (not removed) from the support frame 34 unexpectedly. The mounting rod 57 passes through the outside of the second case 23 inside the watertight cover 56 and is screwed into the first case 22 (for example, the receiving plate 30). Thus, the second case 23 is mounted so as to be pressed against the first case 22 by the watertight cover 56. Therefore, since it is not necessary to form a fixing hole or the like in the second case 23, the sealing performance of the second case 23 can be ensured.

  The head of the attachment rod 57 is a rotationally operated portion 57A, and is rotated using the manual operation handle 44 indicated by the phantom line in FIG. 13 as a tool. In the rotationally operated portion 57A, a seal member m8 is externally fitted to a part inserted through the top wall 56A. Therefore, the electronic component is double-sealed by the watertight cover 56, the seal member m3, the seal member m6, and the seal member m8.

  On the top wall 56A of the watertight cover 56, a cover wall 60 is formed so as to protrude upward. Normally, the cover 61 is covered with a cap 61 to conceal the rotationally operated portion 57A. Conversely, when removing the attachment rod 57, the cap 61 is removed, the manual operation handle 44 is removed from the handle shaft 45 and used as a tool, the attachment rod 57 is rotated, and the attachment rod 57 is removed.

  In the water supply area where the water distribution facility K2 and the water supply structure K1 are laid, when an earthquake exceeding a predetermined seismic intensity occurs, the depletion prevention shut-off valve is activated to prevent the water in the distribution reservoir W from being depleted, The flow path of the water main H is blocked. In addition, in the shutoff valve 1 (emergency shutoff valve) connected in the vicinity of each water faucet D due to the occurrence of an earthquake, when the earthquake detector 53 detects an earthquake with a predetermined seismic intensity or higher, A seismic intensity signal is output to the control board, and electric power is supplied from the primary battery 55 to the DC motor 49 to drive the drive mechanism unit 20 so that the valve body 13 is driven to block the flow path in the valve box 11. Thereby, the water supply in the water supply pipe 8 is automatically shut off. That is, the water supply to the water main H and the water supply pipe 8 is shut off regardless of whether the water main H or the water supply pipe 8 is damaged by an earthquake.

  With the shut-off valve 1 shutting off the water supply to the water supply pipe 8, the operator can use the gate valve closest to the distribution reservoir W to restore the water main H regardless of whether the water main H is damaged or not. The first gate valve B1 which is B is closed, and the presence or absence of breakage of the first water main portion H1 which is the water main portion from the distributing reservoir W to the first gate valve B1 is investigated. That is, the water pressure is applied to the first water main part H1, and the water pressure of the first water main part H1 is examined by a water pressure gauge. If the water pressure does not reach the loaded value, it can be seen that the first water main portion H1 is damaged and water is leaking, so the first water main portion H1 is restored (repaired). When the water pressure reaches the value loaded, it is determined that there is no damage, and then the process proceeds to the investigation of the second water main part H2.

  In this embodiment, the 2nd water main part H2 is the water main H between the 1st gate valve B1 and the 2nd gate valve B2 of the one downstream side. A water supply structure K1 is connected to the second water main portion H2 through one or a plurality of water faucets D.

  In the investigation of whether or not the second water main portion H2 is damaged, the first water main portion H1 that was not damaged is filled with tap water, the first gate valve B1 is opened, the second gate valve B2 is closed, Water pressure is applied from the distribution reservoir W to the second water main portion H2 through the one water main portion H1, and the water pressure of the second water main portion H2 is investigated by a water pressure gauge. In this case, in the 2nd water main part H2, since the water supply pipe 8 of the water supply structure K1 is branched via the water tap D, in the 2nd water main part H2, it does not reach the value to which the water pressure was loaded. Even in this case, the damage is not necessarily in the second water main part H2, and it is assumed that at least one of the second water main part H2 and the water supply pipe 8 is damaged.

  In such a case, conventionally, an operator had to close the first stop cock 5A or the second stop cock 5B in the residential land R2. The first stop cock 5A and the second stop cock 5B are provided for each building 9, and when there are many buildings 9, much labor is required, and the restoration is delayed.

  However, in the water supply structure K1 in the present embodiment, the seismic intensity signal from the seismic detector 53 when the seismic detector 53 detects an earthquake having a predetermined seismic intensity or higher in the shutoff valve 1 regardless of whether the water supply pipe 8 is damaged. Is output to the control board, and power is supplied from the primary battery 55 to the DC motor 49 to drive the drive mechanism unit 20, and the valve body 13 blocks the flow path in the valve box 11. For this reason, even if an operator enters residential land R2 and does not close the 1st stopcock 5A and the 2nd stopcock 5B in residential land R2, the flow path of the water supply pipe 8 is interrupted | blocked. .

  Therefore, it does not take much time to specify the damaged portion as much as the operator does not have to close the first stop cock 5A and the second stop cock 5B. For this reason, the efficiency of restoration work of the water main H can be improved, and early restoration is realized.

  Thus, in the water supply structure K1 of this embodiment, the cutoff valve 1 is arrange | positioned in the vicinity of each water faucet D. If an earthquake exceeding a predetermined seismic intensity occurs, the shutoff valve 1 automatically closes the flow path of the water supply pipe 8. In that case, it is possible to investigate the breakage of the water main H by investigating only the water main H without investing in the water stop work on the side of the water supply pipe 8 and without investigating the water supply pipe 8. Early recovery is possible.

  In other words, assuming that an earthquake exceeding the specified seismic intensity has occurred and the water main H is damaged, when investigating the water main H by closing the gate B, the water main H is actually damaged Even if it is unclear whether the breakage of the shut-off valve 8 is unknown, the shut-off valve 1 is connected between the water faucet D and the meter box 3 in the water supply pipe 8 (particularly, in this embodiment, the shut-off valve 1 D) is connected to the vicinity of D), so that the restoration work can be performed by specifying the damage only to the water main H, so that the water main H can be restored at an early stage.

  As a survey for the restoration of the water main H, the same method as before is used. That is, using the gate valve B (B1, B2,...), The water main H is inspected for each predetermined section in order from the upstream side. And water pressure investigation for every 1st water main part H1 and 2nd water main part H2 which are a predetermined division (henceforth, 3rd water main part, 4th water main part toward the downstream) Since the water supply to the downstream side is shut off by the shut-off valve 1, the presence or absence of breakage can be easily and quickly determined for each water main portion, so that the water main H can be restored early. Can do.

  The shut-off valve 1 is embedded in the public road R1. For this reason, even if the building 9 (house) of the residential land R2 collapses due to an earthquake, there is little possibility that the shutoff valve housing 5D covering the shutoff valve 1 is blocked. If the shut-off valve housing 5D is blocked by an obstacle, the owner's permission must be obtained to remove the obstacle, and therefore it is difficult to close the second stop cock 5B. However, by burying the shut-off valve 1 in the public road R1, the operator can operate the shut-off valve 1 without permission in the work space of the shut-off valve housing 5D, and the shut-off valve 1 itself can be easily restored.

  The operation of the shutoff valve 1 in the above configuration is as described below. In a normal time before an earthquake occurs, the valve body 13 is open to open the water supply channel 14 as shown in FIG. This is the state shown in FIG. That is, in the drive mechanism unit 20, the helical gear 37 is rotated clockwise about the valve shaft 19, and the pressing member 47 is rotated clockwise about the valve shaft 19 together with the helical gear 37. is there. In other words, the state in which the helical gear 37 is rotated clockwise around the valve shaft 19 is an open state in which the valve body 13 is opened to open the water supply passage 14. Thereby, water supply is made to each detached house.

  The seismic detector 53 detects an earthquake having a seismic intensity equal to or greater than a predetermined seismic intensity, and when the seismic intensity signal is output to the control circuit of the control board, the control circuit inputs the seismic intensity signal from the seismic detector 53. Thus, control is performed so that power is supplied from the primary batteries 55, 55 to the DC motor 49. As a result, the DC motor 49 is driven, the drive bevel gear 51 rotates about its axis, and the driven bevel gear 33 meshed with the drive bevel gear 51 rotates about the shaft portion 40, The meshing spur gear 39 rotates about its axis, and the main shaft 41 connected to the spur gear 39 and the worm 36 fitted on the main shaft 41 rotate about its axis. Then, the helical gear 37 meshed with the worm 36 rotates, the valve shaft 19 connected to the helical gear 37 rotates about its axis, and the valve body 13 blocks the water supply path 14 inside the valve box 11. Close (see FIG. 6). The driving of the DC motor 49 is controlled by a timer, for example, and is set so that the valve body 13 closes the water supply passage 14 when the driving is continued for a predetermined time.

  When the valve shaft 19 rotates about its axis, the presser member 47 fixed to the valve shaft 19 rotates counterclockwise around the axis of the valve shaft 19, and the LED lights or flashes. Thus, a state in which water flow through the water supply channel 14 is blocked is notified. In this case, the LED notification is detected by a magnetic sensor.

  The power supply unit 21 (primary batteries 55, 55) of the shutoff valve 1 is not connected to an external power supply. In other words, since no electrical wiring is connected to the power source unit 21, the handling thereof is also unnecessary. For this reason, compared with the installation work which connected the electric wiring to the power supply part 21, the installation work of the shut-off valve 1 of this embodiment does not take an effort remarkably. In addition, since there is no need for electrical wiring, there is no concern about disconnection, and there is no concern about power outages associated with earthquakes and fires. Further, from the viewpoint that wiring is not necessary, the water supply pipe 8 can be connected at any place.

  In the shut-off valve 1 in the present embodiment, the seismic detector 53 is not an acceleration sensor that always detects seismic intensity, but a seismic sensor, so that the power of the primary batteries 55 and 55 is always consumed by the seismic detector 53. There is nothing. For this reason, even if the battery used for the shutoff valve 1 is installed (used) in a state where it is not charged by the primary batteries 55, 55, it has a very long life. When battery replacement is required on a regular basis (for example, in an environment where battery replacement is required every eight years), it is possible to maintain sufficient power without charging or repeated charging. is there. Or it can suppress that the replacement frequency of a battery increases.

  In the shutoff valve 1 of the present embodiment, the first case body 24 and the lid body 28, the bottom wall 25 and the upper surface 11 a, the outer peripheral surface portion of the support frame 34, the middle portion in the axial direction of the handle shaft 45, and the insertion hole 29 are inserted. The sealing member m1 is provided in the middle part of the valve shaft 19 in the axial direction, between the bottom wall 23A and the cover 50, on the outer peripheral surface of the fitting portion 31, and on the part to be inserted through the top wall 56A in the rotation operated portion 57A. ~ M8 are provided. Thus, since different members are attached via the seal member, even if rainwater or the like has entered the meter box 3, entry of water into the drive mechanism unit 20 and the electronic component group 21 can be suppressed. .

  In particular, the four side walls 56B of the watertight cover 56 are configured to be fitted from the outside to the seal member m3 fitted to the outer peripheral surface portion of the support frame 34 of the lid 28, and the electronic component group 21 is configured to be watertight. The cover 56 and the second case 23 are double covered. For this reason, the electronic component group 21 which is easily affected by water can be reliably protected from water.

  In this type of shut-off valve 1, there is a request to periodically replace electronic components. In the shutoff valve 1 of the present embodiment, in particular, the power supply unit 21 can be replaced as a cartridge. That is, the cap 61 is removed from the cover wall 60 of the watertight cover 56, the manual operation handle 44 (tool) is mounted on the rotation operated portion 57A, and the mounting rod 57 is rotated to remove the mounting rod 57. After doing so, the watertight cover 56 is removed from the first case 22. Then, since the second case 23 is exposed, the fitting portion 31 is removed from the fitted portion 32 so as to grasp and pull up the second case 23. Then, the driven bevel gear 33 that is the driven transmission portion and the drive bevel gear 51 that is the drive transmission portion are disengaged, and the power source portion 21 can be detached from the drive mechanism portion 20 together with the second case 23.

  As described above, according to the shutoff valve 1 of the present embodiment, a plurality of electronic components are combined into a unit in the form of the power supply unit 21, and the power supply unit 21 and the drive mechanism unit 20 include a drive transmission unit. Therefore, the power supply unit 21 can be handled collectively with respect to the drive mechanism unit 20, and the power supply unit 21 can be removed from the drive mechanism unit 20 very easily. In order to mount the new power supply unit 21 to the drive mechanism unit 20, the power supply unit 21 is moved together with the second case 23 so that the drive bevel gear 51 of the power supply unit 21 meshes with the driven bevel gear 33. What is necessary is just to mount | wear to the one case 22 (drive mechanism part 20).

  Furthermore, in this embodiment, it is easy to remove the drive mechanism unit 20 from the valve box 11. After the power supply unit 21 is removed from the drive mechanism unit 20 as described above, the mounting bolt 48 is exposed when the lid 28 of the first case 22 is removed and the first case 22 is opened. 48. Also, the bolt 67 is removed and the first case 22 is pulled upward. Then, the valve shaft 19 is pulled out from the helical gear 37 and the bottom wall 25 (insertion hole 29), and the drive mechanism 20 can be removed from the valve box 11 together with the first case 22.

  By doing in this way, maintenance of drive mechanism part 20 can be performed, for example. Alternatively, when the drive mechanism unit 20 is replaced, the valve shaft 19 is inserted into the insertion hole 29 of the bottom wall 25 of the first case 22, and the bottom wall 25 and the upper surface of the valve box 11 from the inside of the first case 22. 11a is inserted and tightened, the upper end side of the valve shaft 19 is inserted into the central portion of the helical gear 37, the holding member 47 is placed on the upper end surface of the valve shaft 19, and the mounting shaft 48 is used to mount the valve shaft 19 and the helical gear 37. , And the pressing member 47 are integrated, the drive mechanism 20 can be attached to the upper surface of the valve box 11 together with the first case 22.

  According to the shutoff valve 1 of the present embodiment, the drive mechanism unit 20 is a unit, and the drive mechanism unit 20 and the valve shaft 19 are only connected by the mounting bolts 48. The mechanism unit 20 can be attached and detached very easily, and replacement of each unit can be easily performed. Furthermore, the shut-off valve 1 is a unit so that it has a compact structure without any special piping. For example, it is screwed into an existing water supply pipe 8 by a joint 2 generally used for the water supply pipe 8. For example, the shutoff valves 1 can be easily added.

  The water supply structure of this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention. In the water supply structure K <b> 1 in the above-described embodiment, the example in which the shutoff valve 1 is connected via the joint 2 in the vicinity of each water faucet D in the water supply pipe 8 has been described. However, as shown in the second embodiment of FIGS. 15 to 17, it is also preferable to connect the shutoff valve 1 to the water supply pipe 8 closest to the primary side of the meter box 3. As a specific position for connecting the shut-off valve 1, it is a position away from the meter box 3 on the primary side with respect to the flexible pipe (flexible pipe joint) inclined upward on the secondary side.

  As the joint 2, the male screw 66 in the first embodiment and the female screw joint 68 screwed to the male screw 66 are used. The shutoff valve 1 is covered with a shutoff valve housing 5E. The operator can operate the shutoff valve 1 (manual operation handle 44) in the work space of the shutoff valve housing 5E. Further, the shutoff valve 1 can be replaced and maintained. In this case, the shutoff valve 1 has the same configuration as the shutoff valve 1 connected in the vicinity of the water faucet D.

  In general, the water supply pipe 8 closest to the primary side of the meter box 3 is a fragile part that is easily damaged by the occurrence of an earthquake. By connecting the shutoff valve 1 to such a portion, the supply of tap water to the secondary side can be shut off.

  As shown in the third embodiment of FIGS. 18 and 19, it is conceivable to connect the shutoff valve 1 in the vicinity of the primary side of the elbow joint 10 in the water supply pipe 8. As shown in FIG. 19, since the joint 2 is the same as that of 2nd embodiment, the same code | symbol is attached | subjected and the description is not repeated.

  The shutoff valve 1 is covered with a shutoff valve housing 5F. The operator can operate the shutoff valve 1 (manual operation of the manual operation handle 44) in the work space of the shutoff valve housing 5F. Further, the shutoff valve 1 can be replaced and maintained. The elbow joint 10 has a large difference in the embedding depth of the water supply pipe 8 on the primary side and the water supply pipe 8 on the secondary side. When the elbow joint 10 is used for this purpose, an earthquake occurs. The elbow joint 10 is subject to force from multiple directions and is easily damaged. Therefore, by connecting the shutoff valve 1 in the vicinity of the primary side of the elbow joint 10, the shutoff valve 1 is closed in the event of an earthquake, water supply to the secondary side is shut off, and the first stop cock 5A needs to be shut off. There is no water supply structure K1 with high convenience.

  Furthermore, although not shown, it is also preferable that the shutoff valve 1 is connected to the water supply pipe 8 in the vicinity of each water faucet D in the water supply pipe 8 and the water supply pipe 8 closest to the primary side of the meter box 3. By doing in this way, the water leak detection between the cutoff valves 1 is easy. Moreover, it is also preferable to connect the shut-off valve 1 in the vicinity of the primary side of the portion further branched in the water supply pipe 8, or in the vicinity of the primary side of the part that is bent without branching. This is because the part further branched in the water supply pipe 8 is also a fragile part that is easily damaged by the occurrence of an earthquake.

  For the purpose of early restoration of the water main H, the shutoff valve 1 is located as close as possible to the water main H, the branch between the water main H and the water supply pipe 8, or the water supply pipe 8 itself. It is particularly preferable to connect to a portion where the direction of laying in the water supply pipe 8 (vertical direction or horizontal direction) changes.

  In the said embodiment, the water supply structure K1 connected to the water distribution facility K2 provided with 1st gate valve B1 and 2nd gate valve B2 was demonstrated to the example. However, the water supply structure K1 of the present invention can also be connected to a water distribution facility K2 that does not have the first gate valve B1. In other words, a configuration in which one or a plurality of water faucets D are connected in the middle of the water main H between the shutoff valve for depletion prevention and the most upstream gate valve with respect to the reservoir W is also considered. It is done.

  In each of the above embodiments, the predetermined seismic intensity detected by the earthquake detector 53 is set to the same seismic intensity as the depletion prevention cutoff valve provided in the reservoir W. However, it is also preferable to set the seismic sensitivity of the seismic detector 53 higher than the seismic sensitivity of the shut-off valve for preventing depletion, for example. By doing in this way, before the depletion prevention cutoff valve operates, the water supply path of the water supply pipe 8 is shut off, and leakage at each door side can be prevented. Alternatively, the seismic sensitivity of the earthquake detector 53 can be set lower than the seismic sensitivity of the depletion prevention cutoff valve. By doing in this way, it is possible to prevent depletion that is prioritized in the event of an earthquake, and also to prevent leakage of tap water between the distribution reservoir W and the water main H, and the shutoff valve 1 can be used as a shutoff prevention valve. Can be guaranteed in case of failure due to earthquake.

  The shut-off valve of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. In the shut-off valve of the present invention, the power supply unit includes a drive transmission unit for transmitting the driving force to the driven transmission unit of the drive mechanism unit, and is configured so that the electronic components are collected and handled integrally. The driven transmission part and the drive transmission part are detachable. In the above embodiment, the drive bevel gear 51 is used as the drive transmission unit, and the driven bevel gear 33 is used as the driven transmission unit.

  That is, a bevel gear is used as means for transmitting power from the power supply unit 21 to the drive mechanism unit 20. However, the present invention is not limited to this example. As another configuration of the drive mechanism unit, a connection that directly connects the rotation around the vertical axis of the drive shaft of the DC motor in the power supply unit to the valve shaft. A mechanism may be provided, and by making the drive shaft and the coupling mechanism of the DC motor detachable, the power supply unit can be detachable from the drive mechanism unit.

  In the above embodiment, in the power supply unit 21, all electronic components are configured as a unit in the second case 23. However, among the plurality of electronic components, for example, all the electronic components are not necessarily unitized, for example, only the primary batteries 55 and 55 and the control board are used as a unit, or only the primary batteries 55 and 55 and the earthquake detector 53 are used as a unit. However, it is also possible to employ a configuration in which at least two electronic components are used as a unit, a case for each unit is prepared, and the unit is stored for each case.

  The primary batteries 55 and 55 are primary batteries that are not supplied with power from the outside. However, the battery may be of a type that can receive power supply, for example, a storage battery using the principle of an electric double layer capacitor, but the battery used in the present embodiment is in a state where the shut-off valve 1 is installed. Power is not supplied, but it is used independently. Further, the electronic component is not limited to the above embodiment.

  In the above-described embodiment, the power source unit 21 has been described as being housed in the second case 23 in order to suppress water intrusion and to handle a plurality of electronic components as the power source unit 21. However, in this invention, it is not necessarily limited only to the form in which the power supply part 21 is accommodated in a case. For example, it is also conceivable that the electronic component and the bottom wall 23A are made into a unit by assembling the electronic component on the bottom wall 23A and resin molding the electronic component.

  When the shutoff valve 1 is covered with the shutoff valve housings 5E and 5F as in the second embodiment and the third embodiment, it is considered that the operation of the manual operation handle 44 is difficult from the ground. . Therefore, the shutoff valve 1 of FIGS. 20 and 21 is configured so that the manual operation handle 44 can be easily operated even when the shutoff valve 1 is covered with the shutoff valve housings 5E and 5F. Specifically, an extension portion 70 is formed that is extended so that the mounting portion 46 of the shut-off valve 1 bends upward. The extension part 70 includes a horizontal part 71 that extends from the attachment part 46 in the horizontal direction, and a vertical part 72 that extends upward from the tip of the horizontal part 71. The handle shaft 45 is extended into the horizontal portion 71.

  The manual operation handle 44 is provided with a hook-shaped handle 73 that is inserted into the vertical portion 72 from above. That is, the manual operation handle 44 is attached to one end of the handle 73. The length of the handle 73 is changed according to the embedding depth of the shutoff valve 1. The shut-off valve 1 includes a conversion mechanism that changes the rotation of the handle 73 around the vertical axis to the rotation of the handle shaft 45 around the horizontal axis. The conversion mechanism includes a shaft side bevel gear 74 on the handle shaft 45 side and a handle side bevel gear 75 on the handle 73 side. The handle 73 and the handle-side bevel gear 75 may be separate or integrated, but in this case, the handle 73 and the handle-side bevel gear 75 are separate and the handle-side bevel gear 75 meshes with the shaft-side bevel gear 74. In order to achieve this state, the vertical portion 72 is provided so as to be rotatable about the vertical axis. A recess 76 is provided at the other end of the handle 73 so as to be integrated with the upper end of the handle-side bevel gear 75. The trunk portion 77 and the vertical portion 72 of the handle-side bevel gear 75 are fitted via a seal member 78. The concave portion 76 is also a portion that is fitted to the rotationally operated portion 57A with the cap 61 removed. That is, as in the above embodiments, the manual operation handle 44 is also used to rotate the attachment rod 57 and the handle shaft 45.

  According to the above configuration, the operator holds, for example, the manual operation handle 44 and inserts the other end of the manual operation handle 44 into the vertical portion 72 so that the recess 76 is fitted to the upper end of the handle-side bevel gear 75. . Subsequently, when the manual operation handle 44 is rotated in a predetermined direction, the rotation of the manual operation handle 44 is transmitted to the handle shaft 45 via the conversion mechanism, and the valve body 13 can be opened and closed via the clutch mechanism 38. .

  As described above, when the shut-off valve 1 is buried at a deep position, the shut-off valve 1 is configured as shown in FIGS. 20 and 21 to open and close the valve body 13 with easy (easy) work. Can do. In addition, by removing the cap 61 and fitting the concave portion 76 to the rotationally operated portion 57A, the attachment rod 57 is rotated to remove it, and the second case 23 is gripped and pulled up so that the fitted portion The fitting part 31 can be removed from 32, and the power supply part 21 can be removed from the drive mechanism part 20 together with the second case 23. When the manual operation handle 44 is not used, a cap 61 </ b> A is attached to the extension portion 70 so that water does not enter from the extension portion 70.

  Note that the joint 2 is not limited to the above embodiment, and is preferably changed according to the place where the shutoff valve 1 is attached. For example, examples of the joint include a taper female thread and a joint for polyethylene pipe.

  In the second embodiment, the shutoff valve 1 is disposed at a position away from the meter box 3. However, the meter box 3 can be connected to the primary side of the stop cock 5B. In this case, in order to avoid the side wall of the meter box 3, a long joint is used, or a short pipe is connected to the primary side of the stop cock 5B, and the shutoff valve 1 is connected to the primary side of the short pipe. It is possible.

  DESCRIPTION OF SYMBOLS 1 ... Shut-off valve, 3 ... Meter box, 5A ... 1st stop cock, 5B ... 2nd stop cock, 6 ... Water meter, 8 ... Water supply pipe, 9 ... Building, 11 ... Valve box, 13 ... Valve body, DESCRIPTION OF SYMBOLS 14 ... Water supply path, 20 ... Drive mechanism part, 21 ... Power supply part, 53 ... Earthquake detector, 55 ... Primary battery, B ... Gate valve, B1 ... First gate valve, B2 ... Second gate valve, D ... Water diversion Plug, H ... Water main, H1 ... First water main part, H2 ... Second water main part, K1 ... Water supply structure, K2 ... Water distribution facility, R1 ... Public road, R2 ... Residential land, W ... Water reservoir

Claims (6)

A water supply structure connected to a water distribution facility comprising a water main connected to a water reservoir and a gate valve disposed in the middle of the water main,
A water supply pipe branched from the water main through a water faucet connected in the middle of the water main and extended toward the building side; a meter box provided in the middle of the water supply pipe and containing a water meter; A shut-off valve that is connected in the middle of the water supply pipe and closes the flow path of the water supply pipe when a predetermined seismic intensity is exceeded,
A water supply structure characterized in that the shutoff valve is connected between the water faucet and the meter box in the water supply pipe.   The water supply structure according to claim 1, wherein the shutoff valve is connected in the vicinity of the water faucet.   The water supply structure according to claim 1, wherein the shut-off valve is connected in the vicinity of the primary side with respect to the meter box.   The water supply structure according to claim 1, wherein the shut-off valve is connected in the vicinity of the water faucet and in the vicinity of the primary side with respect to the meter box.   The shut-off valve is the primary side of a pipe joint that is connected to bend in the middle of the water supply pipe so as to have a height difference so that the secondary side water supply pipe is positioned higher than the primary side water supply pipe within a predetermined region. The water supply structure of Claim 1 connected to.   The shut-off valve includes a valve box that houses the valve body, a drive mechanism unit that drives the valve body, and a power supply unit that drives the drive mechanism unit. The power supply unit detects only earthquakes exceeding a predetermined seismic intensity. And a battery that supplies power to the drive mechanism, and a controller that controls to supply drive power from the battery to the drive mechanism only when a seismic intensity signal exceeding a predetermined seismic intensity is output from the earthquake detector. The water supply structure according to any one of claims 1 to 5.

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