JP2021004641A - Fluid apparatus connection structure of fluid pipe, joint ring for use in the same and fluid pressure test jig - Google Patents

Abstract

To provide a fluid apparatus connection structure of a fluid pipe which can reduce sizes of a joint ring, a fluid apparatus and installation equipment, the joint ring and a fluid pressure test jig.SOLUTION: A joint ring having a split structure is attached over an end part 1A of a fluid pipe 1 and a connection part 20 of a fluid apparatus 2. A fastening part 5 for fastening one end part side of the joint ring and the fluid apparatus in a sealed state, and a removal prevention part 6 for retaining and fixing the other end part side of the joint ring to an end part of the fluid pipe are arranged, and an annular seal face 24 relatively opposing one end part of the joint ring in a pipe axial core direction is formed at the connection part of the fluid apparatus. A packing having a pipe peripheral packing part 41A for sealing a clearance between the external peripheral face of the end part of the fluid pipe along a pipe peripheral direction, a split surface packing part for sealing a clearance between split surfaces of both-split joint ring bodies while continuing to both end parts of the pipe peripheral packing part, and an end face packing part 41C continuing to a tip part of the both-split surface packing part, and abutting on the annular seal face of the fluid apparatus 2 from the pipe axial core direction is attached to each of a plurality of the split joint ring bodies 30 of the joint ring.SELECTED DRAWING: Figure 2

Description

In the present invention, a metal joint ring having a divided structure is mounted in a sealed state over the end of the fluid pipe and the connection portion of the fluid device facing the end of the fluid pipe in the direction of the axis of the pipe, and the one end side of the joint ring and the said Fluid equipment connection structure of a fluid pipe provided with a fastening portion for fastening the fluid equipment in a sealed state, and a detachment prevention portion for retaining and fixing the other end side of the joint ring to the end of the fluid pipe. And the joint ring and the fluid pressure test jig used for it.

As the fluid equipment connection structure of the above-mentioned fluid pipe, the fluid control valve installation structure shown in Patent Document 1 has been proposed. In this fluid control valve installation structure, a connecting pipe portion having a diameter larger than that of both cut ends of an existing pipe, which is a fluid pipe, is provided on both sides of the valve housing of the fluid control valve, which is an example of a fluid device, in the direction of the tube axis. Is integrally formed. Each of the two-split structure double-joint wheels includes a small-diameter connecting cylinder portion that is externally fitted to the cut end portion of the existing pipe, and a large-diameter connecting portion that is externally fitted to the connecting pipe portion of the fluid control valve. A first dovetail groove for mounting packing along the outer peripheral surface of the cut end portion of the existing pipe is formed on the inner surface of the two-divided joint ring body constituting each joint ring on the small diameter connection cylinder portion side. A second dovetail groove for mounting packing is formed on the inner surface of each split joint ring body on the large-diameter connecting cylinder portion side along the outer peripheral surface of the connecting pipe portion of the fluid control valve. On the divided surface of each divided joint ring body, a third dovetail groove is formed along the pipe axis direction so as to communicate with both ends in the circumferential direction of the first dovetail groove and both ends in the circumferential direction of the second dovetail groove. There is.
The packing to be mounted on each split joint ring has a first pipe peripheral packing portion having a trapezoidal cross-sectional shape to be fitted and mounted in the first dovetail groove and a cross-sectional shape to be fitted and mounted in the second dovetail groove. The trapezoidal second pipe peripheral packing portion and the trapezoidal split surface packing portion having a trapezoidal cross-sectional shape to be fitted and mounted in the third dovetail groove are integrally formed in a closed loop shape.

Japanese Patent No. 3964385

In the conventional fluid control valve installation structure, the first dovetail groove, the second dovetail groove, and both third dovetail grooves formed in each split joint ring body have a packing portion of the first pipe circumference and a second pipe circumference of the packing. Since it is necessary to push the packing portion and the double-split surface packing portion while elastically deforming them for mounting, it takes a lot of time and effort to mount the packing. In particular, when a second dovetail groove is formed on the inner surface of each split joint ring body on the large-diameter connecting cylinder side, it is necessary to secure a peripheral wall portion for forming the dovetail groove on the outer end side of the second dovetail groove. Therefore, the length of the large-diameter connecting portion of the joint ring in the pipe axis direction becomes long. Along with this, the length of the connecting pipe portion of the fluid control valve in the pipe axis direction becomes longer, and as a result, the joint ring and the fluid control valve become larger. Further, the fluid equipment connection point of the fluid pipe is cut in the housing provided with the work on-off valve, and the fluid equipment carried into the upper space in the housing is passed through the work on-off valve operated to open the valve. When arranging between both cut ends of the fluid pipe, it is necessary to use a large work on-off valve through which a large-sized fluid equipment can pass, which has an inconvenience that the installation equipment of the fluid equipment becomes large.

In view of this situation, the main subject of the present invention is the fluid equipment connection structure of the fluid pipe capable of miniaturizing the joint ring and the fluid equipment and the installation equipment, and the useful joint ring and the fluid pressure test jig used for the connection structure. Is in the point of providing.

In the first characteristic configuration of the present invention, a metal joint ring having a divided structure is mounted in a sealed state over the end of the fluid pipe and the connection portion of the fluid device facing the end of the fluid pipe in the direction of the axis of the pipe. A fluid pipe provided with a fastening portion for fastening one end side and the fluid device in a sealed state, and a detachment prevention portion for retaining and fixing the other end side of the joint ring to the end portion of the fluid pipe. Fluid equipment connection structure
An annular seal surface is formed at the connection portion of the fluid device so as to face one end of the joint ring in the direction of the tube axis, and each of the plurality of divided joint ring bodies constituting the joint ring has the said. A pipe peripheral packing portion that seals between the outer peripheral surface of the end portion of the fluid pipe along the pipe circumferential direction, and the bipartite joint ring body that is continuous and adjacent to both ends of the pipe peripheral packing portion in the pipe circumferential direction. A split surface packing portion that seals between the divided surfaces and an end surface packing portion that is continuous with the tip of the split surface packing portion and abuts on the annular sealing surface of the fluid device from the direction of the tube axis. The point is that the provided packing is attached.

According to the above configuration, when a joint ring having a split structure is mounted over the end portion of the fluid pipe and the connection portion of the fluid equipment, a joint ring is formed between the outer peripheral surface of the end portion of the fluid pipe and the joint ring. It is sealed by the pipe peripheral packing portion of the packing attached to each of the plurality of split joint rings. The space between the split surfaces of the adjacent split joint rings is sealed by the double split surface packing portion of the packing. One end of the joint ring and the annular sealing surface of the fluid system are sealed by the end surface packing portion of the packing that abuts on the annular sealing surface from the direction of the tube axis.
As a result, the end surface packing portion of the packing is exposed in a state of facing the annular sealing surface of the fluid device on one end side of the joint ring, so that the outer end portion of the second dovetail groove for mounting the packing is exposed as in the conventional structure. It is not necessary to secure a peripheral wall portion for forming a dovetail groove on the side. The length of the joint ring in the tube axis direction is shortened by the absence of the peripheral wall portion for forming the dovetail groove. Along with this, the length of the connecting portion of the fluid device in the pipe axis direction is also shortened. As a result, the size of the joint wheel and the fluid equipment can be reduced.
For example, the fluid equipment connection point of the fluid pipe is cut in the housing provided with the work on-off valve, and the fluid equipment carried into the upper space in the housing passes through the work on-off valve that has been opened. When arranging between both cut ends of the fluid pipe, a small work on-off valve that allows the miniaturized fluid equipment to pass through can be used, so that the installation equipment of the fluid equipment can be miniaturized. .. Further, when the both joint rings arranged on the both cut end sides are slid to the connection position with respect to both the connection parts of the fluid equipment arranged between the two cut ends of the fluid pipe, the end face of the packing is operated. The packing portion passes through the cut end faces of both cut ends. At this time, since the end face packing portion is not pressed against the outer peripheral surfaces of both cut end portions in a sealed state, it is possible to prevent the end face packing portion from being damaged by the sharp cut end face.

The second characteristic configuration of the present invention is that a fitting portion that fits from the pipe axis direction along the inner peripheral surface of the joint ring is provided at the radial inner portion of the annular sealing surface of the fluid device. There is a point.

According to the above configuration, when a shearing force due to an earthquake or an unequaling force due to fluid pressure acts on the joint between the joint ring and the fluid device, this shearing force is applied to the diameter of the annular sealing surface of the fluid device. It can be received by the contact between the fitting portion provided at the inner portion in the direction and the inner peripheral surface of the joint ring. As a result, the joint portion between the joint ring and the fluid equipment can be firmly constructed.

The third characteristic configuration of the present invention is that the split surface packing portion compressed at the time of fixed connection of the adjacent split joint rings extends toward the end face packing portion on the split surface of each split joint ring body. The point is that there is an extension regulation section that regulates this.

According to the above configuration, when a joint ring having a split structure is mounted over the end portion of the fluid pipe and the connection portion of the fluid equipment, the joint ring body of both split joints is fixedly connected to the adjacent joint wheels of both split joints. The split surface packing portions of the mounted packing are compressed. At this time, the extension restricting portion provided on the split surface of the split joint ring body can regulate the extension of the double split surface packing portion toward the end face packing portion side. As a result, the end face packing portion does not protrude due to the extension of the double split surface packing portion, so that the end face packing portion of the packing and the annular sealing surface of the fluid device can be reliably sealed.

The fourth characteristic configuration of the present invention is that the end surface packing portion of the packing is formed with a ridge projecting toward the annular sealing surface of the fluid device.

According to the above configuration, when the one end side of the joint ring and the fluid device are fastened in a sealed state at the fastening portion, the ridge formed on the end face packing portion is strongly pressed against the annular sealing surface of the fluid device. The high surface pressure between the ridge of the end surface packing portion and the annular sealing surface of the fluid device can improve the sealing property.

The fifth characteristic configuration of the present invention is that a metal touch surface that is in direct contact with the divided surfaces of the divided joint wheels is formed on the divided surfaces of the adjacent divided joint wheels when the two divided joint rings are fixedly connected.

According to the above configuration, when the adjacent two split joint rings are fixedly connected, the metal touch surfaces formed on the split surfaces of the split joint rings come into contact with each other, and the pipe peripheral packing portion and the end face packing of the packing Since the compression of the part can be maintained constant, the assembly management can be simplified.

In the sixth characteristic configuration of the present invention, each of the divided joint rings is formed in the same shape, and one of the divided surfaces is formed on the other divided surface of the other divided joint ring. A positioning convex portion that engages with the positioning concave portion is formed, and the other divided surface engages with the positioning convex portion formed on one of the divided surfaces of the other divided joint ring body. The point is that the positioning recess is formed.

According to the above configuration, when a joint ring having a split structure is mounted over the end of the fluid pipe and the connection portion of the fluid device, the positioning of the split joint rings is determined by the concave portion and the convex portion formed in each split joint ring body. It can be done by engaging with. As a result, it is possible to prevent a step or misalignment of the end face of the double-split joint ring body that the end face packing portion of the packing comes into contact with, so that the compression of the end face packing portion of the packing becomes uniform and stable sealing performance can be ensured. .. Further, it is possible to facilitate the production as compared with the case where the split joint rings are positioned with each other by the pin engaging structure. Moreover, since the plurality of split joint rings are configured to have the same shape, only one production type of the split joint rings is required, and the manufacturing cost can be reduced.

The seventh feature configuration of the present invention is the joint ring used for the fluid equipment connection structure of the fluid pipe according to any one of the first to sixth feature configurations, and is formed on the inner surface of each of the divided joint rings. A pipe circumferential groove on which the pipe peripheral packing portion is mounted is formed, and a split surface square groove on which the split surface packing portion is mounted is formed on both of the divided surfaces of the divided joint ring body. It is formed in a state of communicating with both ends of the square groove in the circumferential direction of the pipe and opening to one end surface of the split joint ring body in the pipe axis direction, and one end surface of each of the split joint ring bodies is the end face packing portion. It is at a point formed on the contact surface.

According to the above configuration, only a pipe peripheral groove for mounting the pipe peripheral packing portion and a split surface square groove for mounting the double split surface packing portion are formed on the inner surface of each split joint ring body, and the end surface is formed. Since the mounting groove is not required for the packing part and the mounting groove is a square groove, the total length of each split joint ring body in the pipe axis direction can be shortened, the split joint ring body can be easily manufactured, and the split joint ring body can be easily manufactured. It is possible to reduce the manufacturing cost of the wheel body and facilitate the packing mounting work.

The eighth characteristic configuration of the present invention is that an engaging convex portion that engages with an engaging concave portion formed in the split surface packing portion is formed on the end surface packing portion side of each of the split surface square grooves. It is in.

According to the above configuration, when the double-split surface packing portion of the packing is compressed due to the fixed connection of the adjacent double-split joint ring bodies, the double-split surface packing portion extends toward the end face packing portion. It can be regulated by the engaging portion between the engaging convex portion on the surface angle groove side and the engaging concave portion on the split surface packing portion. As a result, the end face packing portion does not protrude due to the extension of the double split surface packing portion, so that the end face packing portion of the packing and the annular sealing surface of the fluid device can be reliably sealed.

The ninth feature configuration of the present invention is a fluid pressure test jig for the joint ring used in the fluid equipment connection structure of the fluid pipe according to any one of the first to sixth feature configurations, and is the fluid pipe. A tubular test jig body having a split structure that can be exteriorized is provided on both sides of the test jig body in the direction of the tube axis, and the end face packing portions of the pair of joint rings exteriord by the fluid tube. A second annular sealing surface that comes into contact with the fluid from the fluid core direction is formed, and the test jig body has a connecting portion for pulling the both joint rings from the fluid core direction with a fastener and connecting them in a sealed state. A fluid filling portion for filling the pressure fluid in the jig-side internal space formed between the inner surface of the test jig main body and the outer peripheral surface of the fluid pipe is provided, and the inside of the jig-side. The space is configured to be communicable with the joint ring side internal space formed between the inner surface of the two joint wheels and the outer peripheral surface of the fluid pipe.

According to the above configuration, a tubular test jig main body having a divided structure is externally arranged between the pair of joint rings externally attached to the fluid pipe. The connecting portion of the test jig main body and the double joint ring are pulled from the pipe axis direction by a fastener and connected. As a result, the end face packing portions of the two joint rings come into contact with the second annular sealing surfaces formed on both side portions of the test jig body from the direction of the tube axis axis, and the two are sealed. In this sealed connection state, the joint ring side internal spaces formed between the inner surface of both joint rings and the outer peripheral surface of the fluid pipe are formed between the inner surface of the test jig body and the outer peripheral surface of the fluid pipe. It communicates through the internal space on the jig side. As a result, when the pressure fluid is supplied from the fluid filling portion of the test jig body into the internal space on the jig side, the pressure fluid is filled in the internal space of both joint wheels, and the fluid pressure test of both joint wheels is efficiently performed at the same time. be able to. Further, since it is not necessary to provide a fluid filling portion on the side of both joint wheels, the structure of both joint wheels can be simplified and the manufacturing cost can be reduced as compared with the conventional structure.

Overall side view showing the fluid equipment connection structure of the fluid pipe of the first embodiment Partial sectional view of the fluid equipment connection structure Side view and partially enlarged view of the joint ring FIG. 3 IV-IV sectional view and partially enlarged view FIG. 3 is a sectional view taken along line VV. Split joint ring internal side view of joint ring body FIG. 4 is a cross-sectional view and a partially enlarged view of the split joint ring body taken along the line VII-VII. Section III-VIII sectional view of FIG. Left side view (a), front view (b), right side view (c) of packing Horizontal cross-sectional view when a sluice valve is placed between both cut ends of an existing water pipe Horizontal cross-sectional view during assembly of the fluid pressure test jig Vertical cross-sectional view when the assembly of the fluid pressure test jig is completed Enlarged view of the main part of the fluid equipment connection structure of the second embodiment

Embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 and 2 show a fluid equipment connection structure of an existing water pipe 1 which is an example of a fluid pipe. In this fluid equipment connection structure, although not shown, the valve installation location (equipment installation location) of the existing water pipe 1 is cut by a cylindrical cutter in a housing provided with a work on-off valve in a continuous water state. Both connecting portions 20 of the sluice valve 2, which is an example of the fluid equipment carried into the upper space in the housing, pass through the work on-off valve operated to open the valve, and between the cutting ends 1A of the existing water pipe 1. Are arranged concentrically with each other (see FIG. 10). Both cut ends of the existing water pipe 1 and the connecting portion 20 of the sluice valve 2 facing the cut end in the pipe axis direction are connected to each other in a watertight state (sealed state) by a metal joint ring 3 having a split structure.
In the joint ring mounting step before the pipe cutting step, the double joint ring 3 is slidably mounted in advance in the pipe axis direction on the both cut end portions 1A side of the existing water pipe 1. The double joint ring 3 attached to both cutting ends 1A of the existing water pipe 1 is slid from the outside of the housing to the connecting position on both connecting portions 20 side of the sluice valve 2 during the valve connecting step.

The fluid equipment connection structure of FIGS. 1 and 2 shows the connection complete state of the sluice valve 2, and the fastening portion 5 for watertightly fastening one end side of both joint wheels 3 and both connection portions 20 side of the sluice valve 2. Is provided. A detachment prevention portion 6 is provided to retain and fix the other end side of the double joint ring 3 to both cut end portions 1A of the existing water pipe 1.

Next, the fastening portion 5 will be described.
As shown in FIGS. 1 and 2, substantially a semicircle protruding outward in the radial direction at a position near the center in the pipe axis direction on the outer peripheral surface of the split joint ring body 30 having a two-split structure constituting each joint ring 3. The arc-shaped intermediate connecting flange 31 is integrally formed. As shown in FIG. 7, four first bolt insertion holes 31a are formed in the intermediate connecting flange 31 of each split joint ring body 30 at predetermined intervals in the pipe circumferential direction.
Valve flanges 22 forming a connecting portion 20 are integrally formed on both sides of the valve box 21 of the sluice valve 2 in the pipe axis direction. As shown in FIG. 2, the valve flange 22 has two first bolts located on the lower side of the center of the first bolt insertion holes 31a of the split joint ring body 30 arranged on the lower side of each joint ring 3. A second bolt insertion hole 22a facing the insertion hole 31a in the direction of the pipe axis is formed.
Further, as shown in FIGS. 1 and 2, the first bolt of the split joint ring body 30 arranged on the upper side shown in FIG. 7 is inserted into the upper portion of the valve flange 22 on both sides of the valve box 21 in the pipe axis direction. Of the holes 31a, a fastening boss 23 having a screw hole 23a facing the pipe axis direction is formed so as to protrude from two first bolt insertion holes 31a located on the higher side in the center.

Then, the first bolt 50 inserted into the first bolt insertion hole 31a on the central high side of each of the split joint rings 30 arranged on the upper side is screwed and fixed to the screw holes 23a of the fastening bosses 23 on both sides of the valve box 21. To do. A long bolt 51 is inserted through the remaining first bolt insertion hole 31a of the two joint rings 3 facing each other in the pipe axis direction, and both are provided by a nut 52 and a lock nut 53 screwed into the long bolt 51. The intermediate connecting flanges 31 of the joint ring 3 are fastened and fixed to each other.
The intermediate portion of the two long bolts 51 arranged on the lower side is inserted into the second bolt insertion hole 22a of both valve flanges 22 of the valve box 21.

Next, the detachment prevention unit 6 will be described.
As shown in FIGS. 1 and 2, the detachment prevention portion 6 is composed of a detachment prevention metal fitting 60 having a split structure. The detachment prevention metal fitting 60 is divided into two in the pipe circumferential direction, and a pair of metal split holding members 61 that are detachably held and fixed to the cut end 1A of the existing water pipe 1 from the pipe radial direction. Is provided. The pair of split holding members 61 are connected to each other by tightening the 20% face flanges 61A provided at both ends in the pipe circumferential direction with bolts 62, nuts 63, etc., so that the cut ends of the existing water pipe 1 are connected. It is firmly sandwiched and fixed to 1A.
At one end of the two-split holding member 61 in the pipe axis direction, a semi-circular second end flange 32 is formed so as to project from the other end of the outer peripheral surface of the two-split joint ring body 30 of each joint ring 3. On the other hand, a semicircular arc-shaped engaging projection 64 that can be engaged and disengaged from the outer side in the radial direction of the pipe is integrally formed.
A claw accommodating portion 65 that opens inward in the pipe radial direction is formed on the inner peripheral surface of each of the divided holding members 61. In the claw storage portion 65, a claw member 66 having a plurality of rows of sharp tapered blades along the circumferential direction of the pipe that can bite into the outer peripheral surface of the cut end portion 1A of the existing water pipe 1 is housed. There is.
On the ceiling surface of the claw storage portion 65, the claw member 66 housed in the claw storage portion 65 in a state of biting into the outer peripheral surface of the cut end portion 1A with respect to the split holding member 61 is relatively separated from the pipe axis direction. When it is moved, the claw member 66 is formed on an inclined surface that bites inward in the pipe radial direction and moves.
Then, a detaching force due to an earthquake, uneven sinking, or the like is applied to the fitting connection portion between the cut end portion 1A of the existing water pipe 1 and the detachment prevention metal fitting 60 engaged and fixed to the second end flange 32 of the joint ring 3. When the claw member 66 acts, the claw member 66 bites inward in the pipe radial direction and moves, so that the detachment prevention force is increased.

Next, the valve box 21 of the sluice valve 2 and the joint ring 3 will be described.
As shown in FIGS. 1, 3, and 7, each joint ring 3 includes a split joint ring body 30 having a two-split structure that can be attached to the cut end portion 1A of the existing water pipe 1 from the pipe radial direction. At both ends of each of the divided joint ring bodies 30 in the pipe circumferential direction, a first secant flange 33 projecting outward in the pipe circumferential direction is integrally formed. As shown in FIGS. 1 and 4, the 10% face flanges 33 of the split joints 30 are attached to the 10% face flanges 33 of the split joints 30 with T-head bolts 34 and nuts. Two third bolt insertion holes 36 for fastening at 35 are formed. A semicircular first end flange 37 projecting outward in the radial direction is integrally formed at one end of the outer peripheral surface of each divided joint ring body 30.
As shown in FIGS. 1 and 2, each of both side portions of the valve box 21 in the pipe axis direction is a pipe with respect to the semicircular end surface 37a of the first end flange 37 of the double-split joint ring body 30. The first annular seal surface 24 facing each other in the axial direction is formed so as to project. The end surface 37a of the first end flange 37 is configured as a packing contact surface that comes into contact with the end surface packing body 41Ca of the end surface packing portion 41C of the packing 41, which will be described later, from the direction of the pipe axis. The first annular seal surface 24 is configured as a packing contact surface that comes into contact with the second protrusion 41Cb of the end surface packing portion 41C from the direction of the pipe axis.

Further, a collar that fits in the radial inner portion of the first annular seal surface 24 on both sides of the valve box 21 in the pipe axis direction along the inner peripheral surface of the joint ring 3 from the pipe axis direction. The shaped fitting portion 25 is integrally formed. As shown in FIGS. 2 and 10, the annular end surface 25a of the fitting portion 25 is formed on the cut end surface 1a of the cut end portion 1A of the existing water pipe 1 cut by the cylindrical cutter in the side view and the plan view. It is formed in an arc shape that can be placed close to each other along the line.

Then, the fitting portions 25 provided on both side portions of the valve box 21 are fitted from the pipe axis direction in a close state along the inner peripheral surface of both joint rings 3, so that the joint ring 3 and the sluice valve 2 are fitted. When a shearing force due to an earthquake, an unequaling force due to fluid pressure, or the like acts on the joint with the valve box 21, this shearing force is applied to the fitting portion 25 of the valve box 21 and the inner peripheral surface of the joint ring 3. It can be accepted by contact. As a result, the joint portion between the joint ring 3 and the valve box 21 can be firmly formed.

As shown in FIG. 4, packing 41 is attached to each divided joint ring body 30 of the joint ring 3. As shown in FIG. 9, the packing 41 includes a semi-arc-shaped pipe peripheral packing portion 41A and a pipe peripheral packing portion that seal between the cut end portion 1A of the existing water pipe 1 and the outer peripheral surface along the pipe circumferential direction. The split surface packing portion 41B that seals between the split surfaces 33a of the 10th split surface flange 33 of the adjacent split surface flange 33 and the tips of the split surface packing portions 41B that are continuous with both ends in the pipe circumferential direction of 41A. A semi-arc-shaped end face packing portion 41C that is continuous with the portion and abuts on the first annular seal surface 24 of the valve box 21 from the pipe axis direction along the pipe circumferential direction is provided.

As shown in FIGS. 4, 9 (a) and 9 (b), the pipe circumference packing portion 41A of the packing 41 is formed on a prismatic pipe circumference packing main body 41Aa along the pipe circumference direction with a cut end portion of the existing water pipe 1. A first ridge 41Ab is formed that projects semi-cylindrically toward the outer peripheral surface of 1A. Therefore, when the two split joint rings 30 are fastened with the T-head bolt 34 and the nut 35, the first protrusion 41Ab of the pipe peripheral packing portion 41A is strongly pressed against the outer peripheral surface of the cut end portion 1A of the existing water pipe 1. The sealability can be improved by the high surface pressure between the first ridge 41Ab of the pipe peripheral packing portion 41A and the outer peripheral surface of the cut end portion 1A.

As shown in FIGS. 4, 5, 9 (b) and 9 (c), each of the split surface packing portions 41B of the packing 41 is formed in the shape of an elongated substantially rectangular sheet along the pipe axis direction. There is. At the connection portion of each split surface packing portion 41B with the end surface packing portion 41C, an engaging recess 42A that opens toward both outer sides in the width direction of the split surface packing portion 41B is formed. The engaging recess 42A of the split surface packing portion 41B serves as one component of the stretching regulating portion 42 described later.

As shown in FIGS. 4, 9 (b) and 9 (c), the end surface packing portion 41C of the packing 41 has a semicircular sheet shape in contact with the end surface 37a of the first end flange 37 of the two split joint rings 30. On the outer surface of the end face packing main body 41Ca, and the second ridge 41Cb projecting in a semi-cylindrical shape toward the first annular sealing surface 24 of the valve box 21 are integrally formed. Therefore, when the intermediate connecting flange 31 of the split joint ring 30 and the valve flanges 22 of the valve box 21 are fastened in a sealed state at the fastening portion 5, the second ridge 41Cb on the outer surface of the end surface packing body 41Ca is a valve. It is strongly pressed against the first annular sealing surface 24 of the box 21. The sealability can be improved by the high surface pressure between the second ridge 41Cb of the end surface packing portion 41C and the first annular sealing surface 24 of the valve box 21.

As shown in FIGS. 4 and 6, a pipe peripheral groove 43 on which the pipe peripheral packing portion 41A of the packing 41 is mounted is formed on the inner surface of each divided joint ring body 30. The pipe peripheral groove 43 opens inward in the pipe radial direction, and the opening width of the pipe peripheral groove 43 is slightly larger than the width of the bottom surface of the groove.
Further, a split surface square groove 44 on which the split surface packing portion 41B is mounted is formed on the divided surface 33a of both first split surface flanges 33 of each divided joint ring body 30. The base end of the double-split surface square groove 44 communicates with both ends of the pipe peripheral angle groove 43 in the pipe circumferential direction, and the tip of the double-split surface square groove 44 opens to the end surface 37a of the first end flange 37. The opening width of the split surface square groove 44 on the split surface 33a side is the same as the width of the bottom surface of the groove. As a result, the pipe peripheral packing portion 41A and the split surface packing portion 41B of the packing 41 can be easily attached to the pipe peripheral groove 43 and the split surface square groove 44 formed on the inner surface of each divided joint ring body 30. it can.

A pair of engaging convex portions 42B that engage with each engaging concave portion 42A formed in the split surface packing portion 41B of the packing 41 are projected and formed at the tip portion of each split surface square groove 44 on the end surface packing portion 41C side. ing. The engaging convex portion 42B at the tip of each of the split surface square grooves 44 and the engaging concave portion 42A of the split surface packing portion 41B of the packing 41 that engages with the engaging convex portion 42B are provided on the split surface 33a of each split joint ring body 30. The extension restricting portion 42 that regulates the extension of the split surface packing portion 41B, which is compressed when the two split joint ring bodies 30 are fixedly connected, toward the end surface packing portion 41C is configured.
As a result, when the double split surface packing portion 41B of the packing 41 is compressed due to the fixed connection of the double split joint ring body 30, the end face packing portion 41C does not protrude due to the extension of the double split surface packing portion 41B, so that the packing The end face packing portion 41C of 41 and the first annular sealing surface 24 of the valve box 21 can be reliably sealed.

As shown in FIGS. 3 to 6, each of the divided joint rings 30 is configured to have the same shape, and one divided surface 33a of each divided joint ring 30 has the other of the other divided joint rings 30. A rectangular positioning convex portion 46 is formed that engages with the rectangular positioning concave portion 45 formed on the dividing surface 33a. On the other divided surface 33a of each divided joint ring body 30, for rectangular positioning that engages with the rectangular positioning convex portion 46 formed on one divided surface 33a of the other divided joint ring body 30. A recess 45 is formed.
The positioning convex portion 46 and the positioning concave portion 45 are formed at the central portion between the pair of third bolt insertion holes 36 formed in both the 10th cut surface flanges 33 of the split joint ring body 30.
Then, when the joint ring 3 having a split structure is mounted over the cut end portion 1A of the existing water pipe 1 and the connection portion 20 of the sluice valve 2, the split joint ring bodies 30 are positioned with each other. This can be done by engaging the rectangular concave portion 45 with the rectangular concave portion 46. As a result, it is possible to prevent a step or misalignment of the end surface 37a (packing contact surface) of the double-split joint ring 30 with which the end surface packing portion 41C of the packing 41 abuts, so that the end surface packing portion 41C of the packing 41 can be compressed. Is uniform, and stable sealing performance can be ensured. Further, the production can be facilitated as compared with the case where the split joint ring bodies 30 are positioned with each other by the pin engaging structure. Moreover, since the plurality of divided joint ring bodies 30 are configured to have the same shape, only one manufacturing type of the divided joint ring body 30 is required, and the manufacturing cost can be reduced.

Further, as shown in FIGS. 3 to 6, of the divided surfaces 33a of each divided joint ring body 30, the entire remaining surface except for the positioning concave portion 45, the positioning convex portion 46, and the third bolt insertion hole 36 is both. It is formed on the metal touch surface 47 that comes into direct contact with the split joint ring body 30 when it is fixedly connected. As a result, when the two split joint rings 30 are fixedly connected, the metal touch surfaces 47 formed on the split surfaces 33a of each split joint ring 30 come into contact with each other, and the pipe peripheral packing portion 41A and the end surface of the packing 41 come into contact with each other. Since the compression of the packing portion 41C can be maintained constant, the assembly management can be simplified.

Next, the water pressure (fluid pressure) test jig 7 of the joint ring 3 used in the fluid equipment connection structure will be described.
As shown in FIGS. 11 and 12, a pair of joint rings 3 are slidably arranged on both sides of the test jig mounting position in the sluice valve connection work area of the existing water pipe 1 in a watertight state. A tubular test jig body 70 having a divided structure is externally arranged between the pair of joint rings 3. The test jig main body 70 has a second annular sealing surface 71 that abuts the end surface packing portion 41C mounted on the double joint ring 3 from the direction of the pipe shaft core, and the double joint ring 3 with a fastener 72. A connecting portion 73 for pulling from the direction and connecting in a sealed state, and a fluid filling portion 74 for filling pressure water are provided. A jig-side internal space 75 is formed between the inner surface of the test jig main body 70 and the outer peripheral surface of the existing water pipe 1. The jig-side internal space 75 is configured to be communicable with the joint ring-side internal space 76 formed between the inner surface of both joint wheels 3 and the outer peripheral surface of the existing water pipe 1.

The test jig main body 70 includes a pair of metal dividing jig members 70A that are divided into two in the circumferential direction of the pipe and are detachably and detachably fixed to the existing water pipe 1 in the radial direction of the pipe. The two split jig members 70A are externally fixed to the existing water pipe 1 by tightening and connecting the 30% face flanges 70B provided at both ends in the pipe circumferential direction with bolts and nuts (not shown). To. A semicircular connecting plate 73A constituting the connecting portion 73 is fixed to each of both ends of each dividing jig member 70A in the tube axis direction. A seal seat 77 forming a second annular seal surface 71 is fixed to the outer surface of each connecting plate 73A. The space between the 30th split surface flanges 70B of the split jig members 70A is maintained in a watertight state by packing (not shown).

The fastener 72 connects the connecting plate 73A of the split jig member 70A and the intermediate connecting flange 31 of the split joint ring 30 with bolts 72A and nuts 72B. By the tightening operation of the bolt 72A and the nut 72B, the double joint ring 3 is pulled and fixed to the test jig main body 70. As a result, the end surface packing portion 41C mounted on the double joint ring 3 is pressed against the second annular seal surface 71 of the test jig main body 70 from the pipe axis direction to maintain a watertight state.
In this state, a gap 78 through which pressure water can flow is formed between each inner peripheral surface of the connecting plate 73A and the seal seat 77 of the test jig main body 70 and the outer peripheral surface of the existing water pipe 1. The internal space 75 on the jig side of the test jig main body 70 and the internal space 76 on the joint ring side of the double joint ring 3 are communicated with each other via the gap 78.

The fluid filling portion 74 includes a first plug 74A provided at the center of the lower split jig member 70A in the tube axis direction and a second plug provided at the center of the upper split jig member 70A in the tube axis direction. 74B and. A water pressure supply pipe 83 equipped with a water pressure pump 80, a water pressure gauge 81, a valve 82, etc. is connected to the first plug 74A, and the water in the water tank 84 is boosted to the test water pressure, and the jig of the test jig main body 70 It is supplied from the side internal space 75 to the joint ring side internal space 76 of both joint wheels 3. A discharge pipe 86 provided with a valve 85 or the like is connected to the second plug 74B to discharge air or the like in the jig side internal space 75 of the test jig main body 70 and the joint ring side internal space 76 of both joint wheels 3. To do.

Then, the pressure water supplied from the first plug 74A into the jig-side internal space 75 of the test jig main body 70 is filled into the joint-wheel-side internal space 76 of both joint wheels 3 via the gap 78. Therefore, the fluid pressure test of both joint wheels 3 can be efficiently performed at the same time. Further, since it is not necessary to provide a plug or the like for supplying pressure water on the double joint wheel 3 side, the structure of the double joint wheel 3 should be simplified and the manufacturing cost should be reduced as compared with the conventional structure. Can be done.

[Second Embodiment]
FIG. 13 shows an embodiment in which a detachment prevention portion 6 for retaining and fixing the other end side of the double joint ring 3 to both cut end portions 1A of the existing water pipe 1 is integrally formed with the joint ring 3. In this embodiment, a claw storage recess 90 that opens inward in the radial direction is formed at each of the other ends of the two-split joint ring body 30 of each joint ring 3. In each claw storage recess 90, a claw member 91 that can bite into the outer peripheral surface of the existing water pipe 1 is stored in a state of being prevented from falling off. The outer surface of each claw member 91 is formed on an inclined surface 91a whose diameter becomes smaller toward the outer end side in the pipe axis direction, and slides with the tip of a pressing bolt 92 screwed into each of the other ends of both split joint rings 30. It is in contact in a movable state. Then, the claw member 91, which is in a state of biting into the outer peripheral surface of the cut end portion 1A of the existing water pipe 1, is already installed with respect to the pressing bolt 92 screwed into each of the other end portions of the two split joint ring bodies 30. When the claw member 91 is detached and moved integrally with the cut end portion 1A of the water pipe 1, the claw member 91 is configured to be moved and guided inward in the radial direction to increase the detachment prevention force.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Other Embodiments]
(1) In each of the above-described embodiments, the connection structure between both cutting ends of the existing water pipe 1 and both connecting portions 20 of the sluice valve 2 has been described, but the present invention is not limited thereto. The technique of the present invention can be applied to all the connection structures of the end of the fluid pipe and the connection of the fluid equipment.

(2) In the above-described first embodiment, the stretch restricting portions 42 that regulate the stretching of the split surface packing portion 41B of the packing 41 toward the end surface packing portion 41C are formed on both sides of the split surface square groove 44 in the groove width direction. It is composed of a pair of engaging convex portions 42B and a pair of engaging concave portions 42A formed on both sides in the width direction of the split surface packing portion 41B, but the present invention is not limited to this configuration. For example, extension is restricted from one engaging convex portion 42B formed on one side of the split surface square groove 44 in the groove width direction and one engaging concave portion 42A formed on one side of the split surface packing portion 41B in the width direction. Part 42 may be configured.

1 Fluid pipe (existing water pipe)
1A end (cut end)
2 Fluid equipment (gate valve)
3 Joint ring 5 Fastening part 6 Detachment prevention part 7 Fluid pressure test jig 20 Connection part 24 Circular seal surface (1st annular seal surface)
25 Fitting part 25a Circular end face 33a Divided surface 37a End face (packing contact surface)
41 Packing 41A Pipe circumference packing part 41B Split surface packing part 41C End face packing part 41Cb ridge (second ridge)
42 Stretching restriction part 42A Engagement concave part 42B Engagement convex part 43 Pipe peripheral angle groove 44 Secant angle groove 45 Positioning concave part 46 Positioning convex part 47 Metal touch surface 70 Test jig body 71 Second annular seal surface 73 Connecting part 74 Fluid filling part 75 Internal space on the jig side 76 Internal space on the joint ring side

Claims (9)

A metal joint ring having a divided structure is mounted in a sealed state over the end of the fluid pipe and the connection part of the fluid equipment facing the end of the fluid pipe in the direction of the tube axis, and one end side of the joint ring and the fluid equipment are connected to each other. It is a fluid equipment connection structure of a fluid pipe provided with a fastening portion for fastening in a sealed state and a detachment prevention portion for retaining and fixing the other end side of the joint ring to the end portion of the fluid pipe.
An annular seal surface is formed at the connection portion of the fluid device so as to face one end of the joint ring in the direction of the tube axis, and each of the plurality of divided joint ring bodies constituting the joint ring has the said. A pipe peripheral packing portion that seals between the outer peripheral surface of the end portion of the fluid pipe along the pipe circumferential direction, and the bipartite joint ring body that is continuous and adjacent to both ends of the pipe peripheral packing portion in the pipe circumferential direction. A split surface packing portion that seals between the divided surfaces of the above, and an end surface packing portion that is continuous with the tip of the split surface packing portion and abuts on the annular sealing surface of the fluid device from the pipe axis direction. Fluid equipment connection structure of the fluid pipe equipped with the provided packing. The fluid pipe according to claim 1, wherein a fitting portion for fitting from the pipe axis direction along the inner peripheral surface of the joint ring is provided at a radial inner portion of the annular sealing surface of the fluid device. Fluid equipment connection structure. On the divided surface of each divided joint ring body, an extension regulating portion that regulates the extension of the double split surface packing portion compressed at the time of fixed connection of the adjacent both split joint ring bodies to the end surface packing portion side is provided. The fluid equipment connection structure of the fluid pipe according to claim 1 or 2 provided. The fluid equipment connection structure for a fluid pipe according to any one of claims 1 to 3, wherein a ridge protruding toward the annular sealing surface of the fluid equipment is formed on the end surface packing portion of the packing. .. The fluid according to any one of claims 1 to 4, wherein a metal touch surface is formed on the divided surface of each of the divided joint wheels, which is in direct contact with the divided surfaces of the adjacent divided joint wheels when they are fixedly connected. Fluid equipment connection structure of pipe. Each of the divided joint rings is configured to have the same shape, and one of the divided surfaces is for positioning that engages with a positioning recess formed on the other divided surface of the other divided joint ring body. A convex portion is formed, and the other divided surface is formed with the positioning concave portion that engages with the positioning convex portion formed on one of the divided surfaces of the other divided joint ring body. The fluid equipment connection structure for a fluid pipe according to any one of claims 1 to 5. The joint ring used in the fluid equipment connection structure of the fluid pipe according to any one of claims 1 to 6, and the pipe peripheral packing portion is mounted on the inner surface of each of the divided joint ring bodies. A pipe peripheral groove is formed, and a split surface angle groove on which the split surface packing portion is mounted communicates with both ends of the pipe peripheral angle groove in the pipe circumferential direction on both of the divided surfaces of the divided joint ring body. The joint ring is formed so as to open to one end surface of the split joint ring body in the pipe axis direction, and one end surface of each of the divided joint ring bodies is formed as an abutting surface of the end surface packing portion. .. The joint ring according to claim 7, wherein an engaging convex portion that engages with an engaging concave portion formed in the split surface packing portion is formed on the end surface packing portion side of each of the split surface square grooves. The fluid pressure test jig for the joint ring used in the fluid equipment connection structure of the fluid pipe according to any one of claims 1 to 6, and has a tubular shape having a divided structure that can be attached to the fluid pipe. A second test jig body is provided, and both side portions of the test jig body in the tube axis direction are in contact with the end face packing portions of the pair of joint rings exteriord by the fluid tube from the tube axis direction. An annular sealing surface is formed, and the test jig main body has a connecting portion for pulling the double joint ring from the direction of the tube axis with a fastener and connecting the test jig main body in a sealed state, and the inner surface of the test jig main body and the said. A fluid filling portion for filling the pressure fluid in the jig-side internal space formed between the fluid pipe and the outer peripheral surface is provided, and the jig-side internal space is the inner surface of the double joint ring. A fluid pressure test jig configured to be communicable with the joint ring side internal space formed between the fluid tube and the outer peripheral surface.

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