JP2018096100A - Meter bypass unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a meter bypass unit that can use an existing pit for water meter and an existing upstream side or downstream side water supply pipe as it is, can securely connect to the upstream or downstream side water supply pipe, and can discharge red water, turbid water, and residence water as necessary.SOLUTION: The meter bypass unit comprises: an upstream side switching valve 9 that is provided in a base 8 and is connected to an upstream side end portion of a water meter; a downstream side switching valve 10 that is provided on the base 8 so as to face the upstream side switching valve 9 and is connected to a downstream side end portion of the water meter; a bypass pipe 11 that bypasses the water meter to connect the upstream side switching valve 9 and the downstream side switching valve 10; an upstream side joint member 13 that is connected to the upstream switching valve 9 so as to freely swing against an axis φ of the water meter and is connected to a joint member 5a provided at an end portion of an upstream side water supply pipe 5 so as to freely reciprocate in a direction of the axis φ; and a downstream side joint member 15 that is connected to the downstream switching valve 10 so as to freely swing against the axis φ of the water meter and is connected to a joint member 6a provided at the end portion of a downstream side water supply pipe 6 so as to freely reciprocate in the direction of the axis φ.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a meter bypass unit corresponding to an existing water meter pit which is formed by excavation in the ground and accommodates a meter pipe composed of a water meter (parent meter), a gate valve, an expansion and contraction supplementary pipe, and the like. The present invention relates to a meter bypass unit that is used when a meter pipe in a water meter pit is replaced and bypassed.

  In recent years, local water utilities have switched from receiving tank systems, which have problems with residual chlorine and sanitary management, to directly connected water systems that can supply safer and more delicious water.

  The water tank system has problems in terms of residual chlorine and hygiene management, but supplies water in the water tank even if the water meter in the water meter pit is temporarily replaced due to work or civil engineering work. There is an advantage that you can.

  On the other hand, the direct water supply system directs tap water from the water mains to apartment buildings such as condominiums and buildings such as hospitals, so it can supply safe and delicious water, but the water meter in the pit for water meters During replacement work, etc., water will be cut off, and water cannot be supplied into the building. As a result, in buildings where water cannot be cut off, such as hospitals and restaurants and other commercial facilities, the Waterworks Bureau and its contractors are forced to work at night and change work schedules.

  The problem in the direct water supply system described above can be solved by bypassing the meter pipe in the water meter pit.

  In order to bypass the meter pipe in the water meter pit, a bypass pipe 82 including a gate valve, a joint, a bypass pipe, and the like is provided instead of the meter pipe 81 in the existing water meter pit 80 as shown in FIG. In addition, although not shown, a meter bypass unit (Patent Document 1 and Patent Document 2) consisting of a switching valve, a bypass pipe and the like is installed in the existing water meter pit instead of the meter pipe, Alternatively, a meter bypass unit 83 with a box in which a meter bypass unit is integrated with a box in place of the meter pipe 81 in an existing water meter pit 80 as shown in FIG. 6 (Patent Document 3 and Non-Patent Document 1). Can be incorporated.

  5 and 6, 84 is a lid for opening and closing a water meter pit, 85 is an upstream water supply pipe, 86 is a downstream water supply pipe, 87 is a gate valve, 88 is an expansion / contraction supplementary pipe, 89 is a water meter, 90 Is a housing type joint, and 91 is a flange joint.

  FIG. 7 is a schematic explanatory view of the above-mentioned meter bypass unit with box 83. The meter bypass unit with box 83 is connected to an upstream water supply pipe 85 in a water meter pit 80 in a box 92 that can be opened and closed. A flow path switching valve 93 (three-way valve), a gate valve 94 disposed opposite to the flow path switching valve 93 and connected to the downstream water supply pipe 86 in the water meter pit 80, and a flow path switching valve 93 and the downstream side of the gate valve 94 are accommodated, and a water meter 89 can be detachably attached between the flow path switching valve 93 and the gate valve 94 using a connecting means. It is what.

  Thus, according to the box-equipped meter bypass unit 83, the water from the normal upstream side water supply pipe 85 flows to the downstream side water supply pipe 86 through the flow path switching valve 93, the water meter 89, and the gate valve 94. Yes.

  When the flow path switching valve 93 is switched from this state and then the gate valve 94 is closed, the water from the upstream side water supply pipe 85 does not flow to the water meter 89 side, and passes through the bypass pipe 95 to the downstream side water supply pipe 86. Will flow to. As a result, it is possible to prevent water from being cut off when the water meter 89 is replaced.

  Thus, if the existing meter pipe 81 in the water meter pit 80 is replaced with the meter bypass unit 83 with a box, the water will not be cut off even during the replacement work of the water meter 89, and the user will continue to use water. Can do.

  By the way, when the meter pipe 81 in the water meter pit 80 is bypassed as described above, if it is a new property, it can be constructed in accordance with the new construction, but the meter pipe 81 in the existing water meter pit 80 is used. In the case of incorporating the bypass pipe 82 instead, the bypass pipe 82 may not fit in the existing water meter pit 80, and therefore, surrounding civil engineering work may be required.

  That is, the existing water meter pit 80 must be expanded, and a new water meter pit must be formed by connecting the bypass pipe 82 to the upstream water supply pipe 85 and the downstream water supply pipe 86. At this time, it is necessary to remove peripheral equipment (for example, an outdoor unit of an air conditioner) or dig up the paved ground, which is a large-scale construction.

  Even when the meter bypass unit 83 with a box is incorporated in place of the meter pipe 81 in the existing water meter pit 80, in most cases, it is longer than the existing water meter pit 80. In the same way as the above, civil engineering work is required in the surrounding area, and work for disassembling and removing the unnecessary water meter pit 80 is required, and the product itself is increased in weight by the box, resulting in poor handling.

  Moreover, since the embedding depth of the meter bypass unit 83 with box changes, the connection positions of the upstream water supply pipe 85 and the downstream water supply pipe 86 and the meter bypass unit 83 with box must be matched. As indicated by the lines, it is also necessary to remove the flange and lift the upstream water supply pipe 85 and the downstream water supply pipe 86.

  Thus, when the bypass pipe 82 or the meter bypass unit 83 with a box is incorporated in the existing water meter pit 80, the water meter pit 80 must be excavated in any case, and the construction range However, there is a problem that the construction time is significantly increased and the cost is increased. In addition, it may interfere with the work and life of residents in the building.

  In particular, there is no problem when there is nothing in the construction range, but if there is any equipment such as an outdoor unit of an air conditioner or a bicycle parking lot in the construction range, the influence becomes large.

  Furthermore, the upstream side water supply pipe 85 and the downstream side water supply pipe 86 are often not sized according to the specifications due to residual stress during construction and changes in the ground for many years. The shaft center of 86 may be displaced, or the distance between the surfaces of the flanges of both water supply pipes 85, 86 may be changed. The connection between both water supply pipes 85, 86 and the bypass pipe 82, both water supply pipes 85, 86 and the meter bypass unit 83 with a box may be disturbed.

JP-A-8-226831 JP 2013-151789 A JP 2005-60963 A

MBU meter bypass unit on the website of Nihon Bulb Co., Ltd. [Search on November 22, 2016], Internet <URL: https://www.nippov.co.jp/product/2016/07/MBU.php >

  The present invention has been made in view of such problems, and its purpose is to use an existing water meter pit, an upstream water supply pipe, and a downstream water supply pipe as they are. It eliminates the need for pit expansion work, dismantling / removal work, and eliminates the need for a box, making it lighter, significantly reducing construction time and cost, and providing an upstream water supply pipe. Regardless of the misalignment of the axis of the downstream water supply pipe or the variation in the distance between the surfaces of the flanges of both water supply pipes, it can be reliably and satisfactorily connected to the upstream water supply pipe and the downstream water supply pipe. Another object is to provide a meter bypass unit that can drain muddy water and accumulated water.

  In order to achieve the above object, a meter bypass unit according to the present invention includes a base installed in a pit for a water meter, and an upstream side where the upstream end of the water meter is detachably connected to the base. A switching valve, a downstream switching valve or a gate valve provided on the base so as to face the upstream switching valve and detachably connected to the downstream end of the water meter, and an upstream switching bypassing the water meter A bypass pipe connecting the valve and the downstream switching valve or the upstream switching valve and the downstream side of the gate valve, and the upstream switching valve are swingable with respect to the axis of the water meter and reciprocally movable in the axial direction. An upstream joint member that is detachably connected to a joint member provided at the end of the upstream water supply pipe in the water meter pit, and can swing freely with respect to the axis of the water meter to the downstream switching valve or gate valve And a downstream joint member that is provided so as to be reciprocally movable in the axial direction, and is detachably connected to a joint member provided at an end of a downstream water supply pipe in the water meter pit. The feature is that the width and height are set to fit within the existing water meter pit.

  Water flow having elasticity and swingability between the upstream switching valve and the upstream joint member, between the downstream switching valve and the downstream joint member, or between the gate valve and the downstream joint member. It is preferable to interpose a possible upstream-side stretchable / flexible mechanism and downstream-side stretchable / flexible mechanism, respectively.

  It is preferable that the upstream side expansion / contraction flexible mechanism and the downstream side expansion / contraction flexible mechanism be a water expansion / contraction flexible joint having elasticity and swingability.

  It is preferable that the upstream joint member and the downstream joint member of the meter bypass unit, and the joint member of the upstream water supply pipe and the downstream water supply pipe are respectively flanges.

  The bypass pipe is preferably provided with a drain valve for draining water in the bypass pipe to the outside.

  The base is preferably provided with a height adjusting means capable of adjusting the height of the base from the bottom surface of the water meter pit.

  Preferably, the height adjusting means includes a plurality of height adjusting bolts provided at a plurality of locations on the base so as to be movable in the vertical direction.

The meter bypass unit of the present invention incorporates an expansion / contraction flexible mechanism (expansion / flexion flexible joint) into the joint member (flange) portion at both ends, and the entire length, width and height are accommodated in an existing water meter pit. Since the size is set, when the meter pipe in the existing water meter pit is replaced with the meter bypass unit, the meter bypass unit can be installed in the existing water meter pit without any problem.
As a result, if the meter bypass unit of the present invention is used, expansion work and dismantling / removal work for water meter pits are not required, and there is no need to modify the water supply pipe. The weight can be reduced, and the construction time can be greatly shortened and the cost can be greatly reduced. In addition, it is possible to eliminate water interruption during water meter replacement work, and night work and arrangement with the residents of the building are not required.

Further, the meter bypass unit of the present invention can be expanded and contracted between the upstream switching valve and the upstream coupling member (flange) and between the downstream switching valve or gate valve and the downstream coupling member (flange). A flexible mechanism (expandable flexible joint) and a downstream expandable flexible mechanism (expandable flexible joint) are provided, respectively, and the upstream joint member and the downstream joint member can swing with respect to the axis of the water meter, and the axis Because it is configured to be reciprocally movable in the direction, the upstream water supply pipe and the downstream water supply pipe are not dimensioned as specified due to residual stress during construction of the water supply pipe and changes in the ground for many years. Moreover, it can connect with an upstream water supply pipe and a downstream water supply pipe by changing the space | interval and direction of an upstream joint member and a downstream joint member.
As a result, when the meter bypass unit of the present invention is used, the upstream side water supply pipe and the downstream side water supply pipe and the downstream side water supply pipe and the downstream side water supply pipe are connected regardless of the axial misalignment and the variation in the distance between the surfaces of the flanges of both water supply pipes. It can be reliably and well connected to the side water supply pipe.

  Furthermore, since the meter bypass unit of the present invention is provided with a height adjusting means capable of adjusting the height position of the base in the base, it can be reliably and satisfactorily connected to the upstream side water supply pipe and the downstream side water supply pipe.

In addition, since the meter bypass unit of the present invention has a configuration in which a drain valve for draining water in the unit to the outside is provided in the bypass pipe, red water, muddy water, and stagnant water can be drained as necessary.
That is, if the meter bypass unit of the present invention is used, even if red rust and deposits adhering to the water supply pipe are washed away when water is passed again after the meter bypass unit is installed, it is bypassed even if red water or turbid water is generated. Can be drained from the drain valve provided on the pipe, and can be used to drain stagnant water in the bypass pipe (which may contain red rust and sediment) when replacing the water meter .

It is a partially notched top view of the meter bypass unit which concerns on embodiment of this invention. It is a partially cutaway front view of the meter bypass unit. It is a vertical side view of the meter bypass unit. The case where the meter pipe of the existing water meter pit is replaced with the meter bypass unit is shown, (A) is a plan view of the existing water meter pit containing the meter pipe, and (B) is the water supply replaced with the meter bypass unit. It is a top view of the pit for meters. It is a vertical front view which shows the relationship between the existing water meter pit which accommodated meter piping, and bypass piping. It is a vertical front view which shows the relationship between the existing water meter pit which accommodated meter piping, and the meter bypass unit with a box. It is the schematic of a meter bypass unit with a box.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show a meter bypass unit according to an embodiment of the present invention. The meter bypass unit is excavated and formed in the ground, and includes a water meter 1 (parent meter), a gate valve 2, a telescoping supplementary pipe 3, and the like. It corresponds to the existing water meter pit 4 that accommodates the meter pipe, and is used when the meter pipe in the existing water meter pit 4 is replaced and bypassed as shown in FIG. is there.

  In FIG. 4, 1a is a joint member (flange) of the water meter 1, 2a is a joint member (flange) of the gate valve 2, 3a is a joint member (flange) of the expansion / contraction supplementary pipe 3, and 5 is an upstream water supply pipe, 5a is a joint member (flange) of the upstream side water supply pipe 5, 6 is a downstream side water supply pipe, 6a is a joint member (flange) of the downstream side water supply pipe 6, and 7 is a housing type joint.

  The meter bypass unit includes a base 8 installed in the water meter pit 4, an upstream switching valve 9 provided on the base 8, to which an upstream end of the water meter 1 is detachably connected, and a base 8. The upstream side switching valve 9 is provided opposite to the upstream side switching valve 9 and the downstream end of the water meter 1 is detachably connected to the upstream side switching valve 9. A bypass pipe 11 connected to the side switching valve 10 and the upstream switching valve 9 can swing with respect to the axis φ of the water meter 1 via the upstream expansion / contraction flexible mechanism 12 and can reciprocate in the direction of the axis φ. An upstream joint member 13 detachably connected to a joint member 5a provided at the end of the upstream water supply pipe 5 in the pit 4 for water meter, and a downstream expansion / contraction flexibility to the downstream switching valve 10 Water supply via mechanism 14 It is provided so as to be swingable with respect to the axis φ of the turbine 1 and reciprocally movable in the direction of the axis φ, and is detachably connected to a joint member 6 a provided at the end of the downstream water supply pipe 6 in the pit 4 for water meter. A downstream joint member 15, a drain valve 16 provided in the bypass pipe 11, and a height adjusting means 17 provided in the base 8.

  In addition, the total length, width and height of the meter bypass unit are accommodated in the existing water meter pit 4 and a space where the water meter pit 4 can be easily operated after being stored in the water meter pit 4 is secured. It is set to a size.

  In this embodiment, the meter bypass unit is accommodated in, for example, a water meter pit 4 (length 1000 mm, width 600 mm, depth about 700 mm) used in Ashiya City, Hyogo Prefecture. The overall length (the distance between the upstream joint member 13 and the downstream joint member 15) is 733 mm to 767 mm, the overall width (vertical width in FIG. 1) is 306 mm, and the overall height (in FIG. The height in the direction is set to 240 mm. Moreover, as for the connection type of this meter bypass unit, both the upstream side and the downstream side are flange connections. Furthermore, the weight of this meter bypass unit is 43 kg. Incidentally, the weight of the conventional meter bypass unit with a box of the other company's product is about 70 kg.

  The base 8 is formed of a metal material in a lattice structure in order to reduce the weight, and includes a horizontal portion 8a and a vertical portion 8b connected to the horizontal portion 8a. The upstream side switching valve 9 and the downstream side switching valve 10 are fixed to the horizontal portion 8 a and the vertical portion 8 b of the base 8 by fixing bolts 18.

  The upstream side switching valve 9 is configured as a three-way valve having a ball valve structure having an inlet 19, an outlet 20, and a bypass side outlet 21, and includes an upstream body barrel 22, a plurality of ball seats 23, and a water passage hole. And an upstream side ball 24, a base side presser 25, a branch side presser 26, an upstream stem 27, and the like. The upstream side switching valve 9 is fixed to one end portion of the base 8 by a fixing bolt 18 with an outlet 20 facing the downstream side switching valve 10 side.

  The upstream switching valve 9 is inserted into the inner peripheral surface of the outlet 20 of the upstream switching valve 9 so as to be airtight and slidable toward the downstream switching valve 10, and has a housing shape at the upstream end of the water meter 1. A cylindrical slide supplement pipe 29 connected via a pipe joint 28, a strainer 30 disposed in the slide supplement pipe 29, and an outlet 20 outer peripheral surface of the upstream switch valve 9 move toward the downstream switch valve 10 side. A slide handle 32 that is screwed freely and is connected to the slide supplement tube 29 by a set screw 31. By rotating the slide handle 32 forward and backward, the slide supplement tube 29 and the slide handle 32 are moved downstream. It slides to the switching valve 10 side or the upstream switching valve 9 side. Thereby, it can respond to the water meter 1 of different length.

  Thus, when the upstream side switching valve 9 is rotated 90 degrees forward and backward by the upstream side stem 27, the upstream side switching valve 9 becomes in communication with the inlet 19 and the outlet 20 or the inlet 20 and the bypass side outlet 21, respectively. Water flows to the water meter 1 side or the bypass pipe 11 side.

  The downstream switching valve 10 is configured as a three-way valve having a ball valve structure having an inlet 33, an outlet 34, and a bypass side inlet 35, and includes a downstream main body body 36, a plurality of ball seats 37, and a water passage hole. And a downstream stem 39 and the like. The downstream switching valve 10 is fixed to the other end of the base 8 by a fixing bolt 18 in such a posture that the inlet 33 faces the outlet 20 side of the upstream switching valve 9.

  The downstream switching valve 10 is a meter that is screwed onto the outer peripheral surface of the inlet 33 of the downstream switching valve 10 and contacts a joint member 1 a (flange) provided at the downstream end of the water meter 1 via the gasket 40. And a positioning pin 42 that is provided on the meter flange 41 so as to protrude toward the water meter 1 and is removably inserted into a positioning hole formed in a joint member 1a (flange) of the water meter 1. The positioning pin 42 is inserted into the positioning hole of the joint member 1a (flange), and in this state, the slide handle 32 of the upstream side switching valve 9 is rotated to slide the slide supplement pipe 29 toward the downstream side switching valve 10 side. Then, the joint member 1a (flange) of the water meter 1 and the meter flange 41 of the downstream side switching valve 10 are airtight via the gasket 40. Is crimped between the flanges 1a, 41 is to be sealed.

  Thus, in the downstream side switching valve 10, when the downstream side ball 38 is rotated 90 degrees forward and backward by the downstream side stem 39, the inlet 33 and the outlet 34 or the bypass side inlet 35 and the outlet 34 are in communication with each other. Water flows from the water meter 1 to the downstream switching valve 10 side or from the bypass pipe 11 to the downstream switching valve 10 side.

  In FIG. 2, 44 is an upstream stem presser, 45 is a hermetic plug, 46 is an operation prevention cap, 47 is a protective cap, 48 is a plug, and 49 is a downstream stem presser.

  The bypass pipe 11 includes an upstream elbow 50 that is airtightly connected to the bypass outlet 21 of the upstream switching valve 9 and a downstream elbow 51 that is airtightly connected to the bypass inlet 35 of the downstream switching valve 10. And a straight pipe 52 whose both ends are airtightly connected to the upstream elbow 50 and the downstream elbow 51, respectively, and when the upstream switching valve 9 and the downstream switching valve 10 are switched, the upstream switching Water from the valve 9 flows through the water meter 1 to the downstream switching valve 10 side, or water from the upstream switching valve 9 flows through the bypass pipe 11 to the downstream switching valve 10 side. become.

  The upstream joint member 13 is detachably connected to a joint member 5a (in this example, a flange) provided at the end of the upstream water supply pipe 5 in the water meter pit 4 via a bolt 53 and a nut 54. And is provided at the inlet 19 of the upstream switching valve 9 through the upstream expansion / contraction flexible mechanism 12 so as to be swingable with respect to the axis φ of the water meter 1 and reciprocating in the direction of the axis φ. .

  The upstream expansion / contraction flexible mechanism 12 is composed of a stretchable flexible joint having water stretchability and swingability, and is fitted on the inlet 19 of the upstream switching valve 9 in an airtight manner and has a concave spherical surface. A flexible cylinder 55 (the upstream flexible cylinder 55 has a function of pressing the upstream ball 24 through the ball sheet 23) and a concave spherical surface of the upstream flexible cylinder 55 are slidably supported, and the outer peripheral surface Are formed in a convex spherical surface, and an upstream ball sleeve presser 57 having a concave spherical surface that is screwed to the upstream flexible cylinder 55 and is slidable on the convex spherical surface of the upstream ball sleeve 56. An upstream telescopic tube 58 that is slidably inserted into the upstream ball sleeve 56 toward the upstream water supply pipe 5 and has a stopper portion that comes into contact with the upstream ball sleeve 56 at the base end, and an upstream flexible body 55. And upstream ball sleeve On the outer peripheral surfaces of the sealing O-ring 59 interposed between the upstream ball sleeve 56 and the upstream telescopic tube 58, the upstream flexible cylinder 55, and the upstream ball sleeve presser 57. An upstream dust cover 60 made of rubber is provided, and an upstream joint member 13 (flange) is attached and fixed to the outer peripheral surface of the tip end portion of the upstream ball sleeve 56.

  Therefore, according to the upstream expansion / contraction flexible mechanism 12, when the upstream expansion tube 58 is slid with respect to the upstream ball sleeve 56, the upstream coupling member 13 can reciprocate in the direction of the axis φ of the water meter 1. In addition, when the upstream ball sleeve 56 is swung with respect to the upstream flexible body 55, the upstream joint member 13 can swing with respect to the axis φ of the water meter 1.

  The downstream joint member 15 is detachably connected to a joint member 6a (in this example, a flange) provided at the end of the downstream water supply pipe 6 in the water meter pit 4 via a bolt 53 and a nut 54. And is provided at the outlet 34 of the downstream switching valve 10 so as to be swingable with respect to the axis φ of the water meter 1 via the downstream expansion / contraction flexible mechanism 14 and reciprocating in the direction of the axis φ. .

  The downstream expansion / contraction flexible mechanism 14 is composed of a water expansion / contraction flexible joint having stretchability and swingability, and is fitted on the outlet 34 of the downstream switching valve 10 in an airtight manner and has a concave spherical surface. A flexible cylinder 61 (this downstream flexible cylinder 61 has a function of pressing the downstream ball 38 through the ball sheet 37) and a concave spherical surface of the downstream flexible cylinder 61 are slidably supported, and an outer peripheral surface Is formed in a convex spherical surface, and a downstream ball sleeve presser 63 having a concave spherical surface that is screwed to the downstream flexible cylinder 60 and is slidable on the convex spherical surface of the downstream ball sleeve 62. A downstream telescopic tube 64 that is slidably inserted into the downstream ball sleeve 62 toward the downstream water supply pipe 6 and has a stopper portion that contacts the downstream ball sleeve 62 at the base end, and a downstream flexible barrel 61. And downstream balls O-rings 65 for sealing interposed between the sleeves 62 and between the downstream ball sleeve 62 and the downstream expansion tube 64, and the outer peripheral surfaces of the downstream flexible cylinder 61 and the downstream ball sleeve presser 63. And a downstream dust cover 66 made of rubber, and a downstream joint member 15 (flange) is attached and fixed to the outer peripheral surface of the distal end portion of the downstream ball sleeve 62.

  Therefore, according to the downstream expansion / contraction flexible mechanism 14, when the downstream expansion / contraction pipe 64 is slid with respect to the downstream ball sleeve 62, the downstream coupling member 15 can reciprocate in the axis φ direction of the water meter 1. Further, when the downstream ball sleeve 62 is swung with respect to the downstream flexible body 61, the downstream joint member 15 can swing with respect to the axis φ of the water meter 1.

  In this embodiment, the upstream telescopic flexible mechanism 12 and the downstream telescopic flexible mechanism 14 can both be extended by a maximum of tens of millimeters, and the upstream joint member 13 and the downstream joint member 15 are connected to the water meter 1. It is set so that it can be inclined by 12 ° in an arbitrary direction with respect to the axis φ.

  The drain valve 16 is provided at the upstream end portion of the bypass pipe 11. In this embodiment, the drain valve 16 is connected to the upstream elbow 50 of the bypass pipe 11 via a joint 67. In addition, a manual stop cock with a ball valve structure is used for the drain valve 16.

  The height adjusting means 17 is provided on the base 8 and can adjust the height of the base 8 from the bottom surface of the water meter pit 4.

  In this embodiment, the height adjusting means 17 includes a fixing nut 68 provided at the four corners of the horizontal portion of the base 8 and four height adjusting bolts screwed into the fixing nuts 68 so as to be movable in the vertical direction. 69 and a lock nut 70 that locks the height adjustment bolt 69. By changing the height of the height adjustment bolt 69 relative to the base 8, the height of the base 8 from the bottom surface of the water meter pit 4 is increased. It can be adjusted.

  Next, the case where the meter pipe in the existing water meter pit 4 is replaced with the meter bypass unit described above will be described.

  First, the water flow in the upstream water supply pipe and the downstream water supply pipe is stopped by a water stop cock (not shown), and the open / close lid of the water meter pit 4 is opened. At this time, it is confirmed whether the distance between the surfaces of the joint members 5a, 6a (between the flanges) of the two water supply pipes 5, 6 is within the corresponding range of the meter bypass unit.

  The distance between the surfaces of the joint members 5a, 6a (between the flanges) of the two water supply pipes 5, 6 is confirmed, and if within the corresponding range of the meter bypass unit, the upstream water supply pipe 5, the downstream water supply pipe 6 and the meter Remove flange joints (joint member 2a of gate valve 2, joint member 5a of upstream water supply pipe 5, joint member 1a of water meter 1, joint member 6a of downstream water supply pipe 6) connecting pipes, and meter pipes ( The gate valve 2 and the expansion / contraction supplementary pipe 3 are taken out from the pit 4 for water meter.

  After the meter pipe is taken out from the water meter pit 4, it is confirmed whether there is any abnormality in the water meter pit 4, the joint members 5 a and 6 a (flange) of both water supply pipes 5 and 6, and the like.

  If there is no abnormality in the water meter pit 4 and the joint members 5a, 6a (flange) of the two water supply pipes 5, 6, the meter bypass unit is suspended by a hand crane or the like and stored in the water meter pit 4.

  Thereafter, the height adjusting means 17 is arranged so that the upstream joint member 13 completely matches the joint member 5a of the upstream water supply pipe 5, and the downstream joint member 15 completely matches the joint member 6a of the downstream water supply pipe 6. Then, the upstream expansion / contraction flexible mechanism 12 and the downstream expansion / contraction flexible mechanism 14 are respectively operated to adjust the length of the meter bypass unit and adjust the positions of the upstream coupling member 13 and the downstream coupling member 15, and then the upstream side. The joint member 13 and the downstream joint member 15 are connected to the joint members 5a and 6a of the two water supply pipes 5 and 6, respectively.

  Then, the upstream side switching valve 9 and the downstream side switching valve 10 of the meter bypass unit are operated to pass water to the bypass pipe 11 side, and it is confirmed whether there is any abnormality such as air bleeding or leakage.

  After confirming that there is no abnormality such as leakage, attach the water meter 1 to the meter bypass unit and check whether there is any abnormality such as air venting and leakage.

  Finally, the water supply from the upstream water supply pipe 5 to the downstream water supply pipe 6 is confirmed, and the construction is completed.

  Thus, the meter bypass unit described above can be installed in the existing water meter pit 4 without any problem, so that expansion work and dismantling / removal work of the water meter pit 4 are not required, and both water supplies are provided. There is no need to modify the pipes 5 and 6 and a box is not required, so that the weight can be significantly reduced. Further, the construction time can be greatly shortened and the cost can be greatly reduced. In addition, it is possible to eliminate the water interruption during the replacement work of the water meter 1, and it is not necessary to work at night or with the residents of the building. In this embodiment, the existing meter pipe can be replaced with the meter bypass unit in about 30 minutes.

  Moreover, since the meter bypass unit includes the upstream side extension / contraction flexible mechanism 12, the downstream side extension / contraction flexible mechanism 14, and the height adjusting means 17, the shafts of the upstream side water supply pipe 5 and the downstream side water supply pipe 6 are provided. Connect reliably and satisfactorily to the upstream water supply pipe 5 and the downstream water supply pipe 6 regardless of the misalignment of the core and the variation in the inter-surface distance between the joint members 5 and 6 of the water supply pipes 5 and 6 (flanges). Can do.

  Further, since the meter bypass unit is provided with a drain valve 16 in the bypass pipe 11, when water is passed again after installation of the meter bypass unit, red rust and deposits adhering to the water supply pipe are washed away, and red water and muddy water. Can be drained from the drain valve 16 provided in the bypass pipe 11, and when the water meter 1 is replaced, stagnant water in the bypass pipe 11 (water quality decreases, red rust and deposits). Can be drained).

  By the way, the drainage work by the drainage valve 16 switches the upstream side switching valve 9 and the downstream side switching valve 10 to switch between the inlet 19 and the outlet 20 of the upstream side switching valve 9 and the inlet of the downstream side switching valve 10. 33 and the bypass-side inlet 35 are connected to each other, and in this state, the drain valve 16 is opened and water is passed to the meter bypass unit. At this time, since the drain valve 16 is provided on the upstream side (upstream elbow) of the bypass pipe 11, all the red water and accumulated water in the meter bypass unit can be drained.

  In the above embodiment, a three-way valve having a ball valve structure is used for the upstream side switching valve 9 and the downstream side switching valve 10. However, in other embodiments, the upstream side switching valve 9 is a ball valve. A three-way valve having a structure may be used, and a gate valve (not shown) may be used instead of the downstream side switching valve 10. In this case, the downstream end of the bypass pipe 11 is connected to the downstream side of the gate valve via a branch joint (not shown).

  In the above embodiment, the upstream joint member 13 and the downstream joint member 15 are flanges. However, in other embodiments, the upstream joint member 13 and the downstream joint member 15 are threaded joints ( (Not shown).

  Furthermore, in the above embodiment, the bypass pipe 11 is formed of the upstream elbow 50, the downstream elbow 51, and the straight pipe 52. However, in other embodiments, the bypass pipe 11 is formed of the upstream elbow 50 and the downstream elbow. 51 and the straight pipe 52 may be integrated into the bypass pipe 11.

  In addition, the base 8, the upstream switching valve 9, the downstream switching valve 10, the upstream expansion / contraction flexible mechanism 12, the downstream expansion / contraction flexible mechanism 14, the drainage valve 16, and the height adjusting means 17 also relate to the above embodiment. The present invention is not limited to those, and any shape and structure may be used as long as each function can be exhibited.

  1 is a water meter, 4 is a water meter pit, 5 is an upstream water supply pipe, 5a is a joint member of an upstream water supply pipe, 6 is a downstream water supply pipe, 6a is a joint member of a downstream water supply pipe, 8 is a base, 9 is an upstream switching valve, 10 is a downstream switching valve, 11 is a bypass pipe, 12 is an upstream expansion / contraction flexible mechanism, 13 is an upstream coupling member, 14 is a downstream expansion / contraction flexible mechanism, and 15 is a downstream coupling member. , 16 is a drain valve, 17 is a height adjusting means, 69 is a height adjusting bolt, and φ is an axis.

Claims (7)

  A base (8) installed in the water meter pit (4), and an upstream switching valve (9) provided on the base (8) and detachably connected to the upstream end of the water meter (1) A downstream switching valve (10) or a gate valve provided on the base (8) so as to face the upstream switching valve (9) and to which the downstream end of the water meter (1) is detachably connected. A bypass pipe (11) bypassing the water meter (1) and connecting the upstream side switching valve (9) and the downstream side switching valve (10) or the upstream side switching valve (9) and the downstream side of the gate valve; An upstream water supply pipe (5) in a water meter pit (4) is provided on the side switching valve (9) so as to be swingable with respect to the axis φ of the water meter (1) and reciprocally movable in the direction of the axis φ. An upstream joint member (13) detachably connected to a joint member (5a) provided at the end of the The downstream switching valve (10) or the gate valve is provided so as to be swingable with respect to the axis φ of the water meter (1) and reciprocally movable in the direction of the axis φ, and downstream in the water meter pit (4). And a downstream joint member (15) that is detachably connected to a joint member (6a) provided at the end of the side water supply pipe (6), and has an overall length, width, and height. Meter bypass unit characterized in that it is set to fit in the meter pit (4).   Between the upstream switching valve (9) and the upstream coupling member (13), between the downstream switching valve (10) and the downstream coupling member (15), or between the gate valve and the downstream coupling member (15 2), an upstream expansion / contraction flexible mechanism (12) and a downstream expansion / contraction flexible mechanism (14) having a stretchability and a swing property are provided, respectively. The meter bypass unit described.   The said upstream side expansion-contraction flexible mechanism (12) and downstream side expansion-contraction flexible mechanism (14) were made into the expansion-contraction flexible joint which has a stretching property and a water-swinging property, and was able to pass water. Meter bypass unit.   The upstream joint member (13) and the downstream joint member (15) of the meter bypass unit, and the joint member (6a) of the upstream water supply pipe (5) and the downstream water supply pipe (6) were used as flanges, respectively. The meter bypass unit according to claim 1 or 2, wherein the meter bypass unit is provided.   The meter bypass unit according to claim 1, wherein a drain valve (16) for draining water in the bypass pipe (11) to the outside is provided in the bypass pipe (11).   The meter bypass according to claim 1, characterized in that the base (8) is provided with a height adjusting means (17) capable of adjusting the height of the base (8) from the bottom surface of the water meter pit (4). unit.   The said height adjustment means (17) is provided with the several height adjustment volt | bolt (69) provided in the several places of the base (8) so that the vertical movement was possible. Meter bypass unit.

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