JPH09144959A - Structure of connection joint for fluid transporting pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of the pressure resistant performance and the water-cut performance, and facilitate the manufacture so as to reduce the manufacturing cost by applying the sufficient compressing force to an elastic packing, which is held by an annular recessed part of a first-half connector body even in the case where diameter of a through hole formed in the peripheral wall of a pipe is formed as nearly same as the inner diameter of a fluid transporting pipe. SOLUTION: A first-half connector body 5, which is provided with an opening 5e communicated with a through hole formed in the peripheral wall 1 of a pipe, and a second-half connector body 4 corresponding to the first-half connector body 5 are fastened for fixation by a fastening tool D from the direction crossing the axis direction of the pipe in the condition that both the half bodies are fitted on the peripheral wall 1 of the pipe. The inner peripheral surface of the first-half connector body 5 is formed with an annular recessed part 5c for holding a ring-shaped annular elastic packing 12, which is made to pressure-contact with the periphery of the through hole 2 of the outer peripheral surface of the peripheral wall 1 of the pipe, in the condition that the annular recessed part 5c is opened toward the second-half connector body 4. Furthermore, the second-half connector body 4 is formed with presser projections 4d for compressing a packing part 12a, which is positioned closest to the second-half connector body 4 side among the elastic packing 12 held by the annular recessed part 5c, with the fastening operation of the fastening tool D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid transport pipe, which is provided with a sluice valve which is extended and retracted through a through hole formed in a peripheral wall of the pipe, or a branch pipe which communicates with the through hole formed in the peripheral wall of the pipe. The present invention relates to a connection joint structure used when connecting to.

[0002]

2. Description of the Related Art In the conventional connection joint structure for fluid transportation pipes,
As shown in FIG. 10, a semicircular arc-shaped first half joint body 51 having an opening 50 communicating with a through hole 2 formed in a peripheral wall 1 of a fluid transport pipe A, and a first half joint body 51 relative thereto in the pipe radial direction. The second half split joint body 52 in the shape of a semi-circular arc facing the outer peripheral wall 1 of the fluid transport pipe A is fitted over the pipe peripheral wall 1 from a direction orthogonal or substantially orthogonal to the pipe axis X direction. A ring-shaped elastic packing (O-ring) is detachably tightened and fixed at 54 and is pressed against the inner peripheral surface of the first half joint body 51 around the through hole 2 on the outer peripheral surface of the pipe peripheral wall 1. 55
Was formed in a state of opening toward the second half joint body 52 side (see, for example, Japanese Utility Model Publication No. 41-2694).

[0003]

In the case of this conventional connection joint structure, if the diameter of the through hole 2 formed in the pipe peripheral wall 1 is made substantially the same as the inner diameter of the fluid transport pipe A, The part 56a of the annular recess 56 formed on the inner peripheral surface of the first half joint body 51 passes through the through hole 2 while passing through the tube axis X.
Since it approaches an imaginary plane Z orthogonal to the center line Y of
A part of the elastic packing 55 (the packing part located closest to the second half joint body 52 side) 55a held in the recessed part 56a approaching the virtual plane Z is the bolt 53.
The nut 54 abuts the outer peripheral surface of the pipe peripheral wall 1 from a direction substantially orthogonal to the tightening direction (bolt axis direction), and as a result, sufficient compression force cannot be applied to the elastic packing 55. However, the diameter of the through hole 2 formed in the peripheral wall 1 cannot be increased.
Further, the pressure fluid in the fluid transport pipe A flows into the gap between the inner surface of the first half joint body 51 and the outer peripheral surface of the pipe peripheral wall 1 through the through hole 2 and is retained in the annular recess 56. When pressure acts on the packing portion 55a of the elastic packing 55 that is closest to the second half joint body 52 side,
The packing portion 55a is arranged along the outer peripheral surface of the pipe peripheral wall 1
There is a possibility that the half joint body 52 is elastically deformed and the sealing performance is deteriorated at that portion, causing fluid leakage.
Therefore, a retaining projection for suppressing elastic deformation of the packing portion 55a located closest to the second half joint body 52 side to the second half joint body 52 side is provided with the first half joint body 51. It is conceivable that it is formed on the inner peripheral surface of the above. However, in this case, since the retaining protrusion projects substantially toward the tube axis X side in a state orthogonal to the center line Y of the through hole, A core or the like is required at the time of casting the first half joint body 51, so that the manufacturing cost is increased, and the cross-sectional diameter of the elastic packing 55 is easily dimensionally restricted, and the elastic packing 55 is mounted. Easy to take.

The present invention has been made in view of the above situation, and an object thereof is to make the diameter of the through hole formed in the peripheral wall of the pipe substantially equal to the inner diameter of the fluid transport pipe. However, sufficient compression force can be applied to the elastic packing held in the annular recess of the first half joint body to improve the reliability of the pressure resistance and the water stop performance, and yet, the manufacturing is easy and the production is easy. Another object of the present invention is to provide a useful fluid transport pipe connection joint structure capable of achieving cost reduction.

[0005]

In order to achieve the above object, in the connection joint structure for a fluid transport pipe according to claim 1 of the present invention, an opening communicating with a through hole formed in a peripheral wall of the fluid transport pipe. A first half joint body having the above and a second half joint body corresponding to the first half joint body in a direction orthogonal or substantially orthogonal to the pipe axis direction in a state where the pipe half wall of the fluid transport pipe is sheathed. An annular recess for holding a ring-shaped elastic packing pressed around the through hole of the outer peripheral surface of the pipe peripheral wall, on the inner peripheral surface of the first half joint body. Formed in a state of opening toward the second half joint body side, and further, of the elastic packing held in the annular recess, a packing portion closest to the second half joint body side is tightened by the fastener. The pressing protrusion that compresses with the operation Characterized in that is formed in the second half joint bodies. According to this characteristic configuration, the through hole formed in the peripheral wall of the pipe is held in the annular recess of the first half joint body as the diameter of the through hole is set to be substantially the same as the inner diameter of the fluid transport pipe. Of the elastic packing, even if the packing portion located closest to the second half joint body side comes into pressure contact with the outer peripheral surface of the pipe peripheral wall from a direction substantially orthogonal to the pipe axis direction, the packing portion Can be sufficiently compressed by the pressing projection provided on the second half joint body. Moreover,
Of the elastic packing held in the annular recess, the pressure fluid in the fluid transport pipe flows into the gap between the inner surface of the first half joint body and the outer peripheral surface of the pipe peripheral wall through the through hole, and Even if a pressure is applied to the packing portion located closest to the half joint body side, the packing portion is elastically deformed to the second half joint body side along the outer peripheral surface of the pipe peripheral wall. It can be suppressed by contact with the pressing protrusion provided on the body. Therefore, even if the diameter of the through-hole formed in the peripheral wall of the pipe is set to be substantially the same as the inner diameter of the fluid transport pipe, the compression protrusion and the deformation preventing action by the pressing protrusion on the second half joint body side can prevent Sufficient compressive force can be applied to the elastic packing held in the annular recess of the one-half split joint body, and the reliability of pressure resistance and water stop performance can be enhanced as compared with the conventional connection joint structure. Moreover, since the annular recess formed on the inner peripheral surface of the first half joint body opens toward the second half joint body side, a core or the like is not required during casting of the first half joint body, and moreover, Since the dimensional restriction on the cross-sectional diameter of the elastic packing is not easily received, and the elastic packing is easily attached, the manufacturing can be facilitated and the manufacturing cost can be reduced.

According to a second aspect of the present invention, there is provided a characteristic configuration of a connection joint structure for a fluid transportation pipe, wherein the pressing surface of the pressing projection is an inclined surface located closer to the first half joint body side toward the pipe radial direction outer side. It is in the point of being formed. According to this characteristic configuration, due to the inclined pressing surface of the pressing protrusion, the packing portion closest to the second half joint body side is efficiently moved to the outer peripheral surface side of the pipe peripheral wall as the fastening operation is performed by the fastener. Since it can be bulged and deformed well, the reliability of the pressure resistance and the water stop performance can be further improved as compared with the conventional connection joint structure.

According to a third aspect of the present invention, there is provided a characteristic structure of a connection joint structure for a fluid transportation pipe, wherein a pressing surface of the pressing protrusion is located on the second half joint body side of the elastic packing held in the annular recess. The point is that a curved surface is formed so as to be distant from the first half joint body toward the central portion side in the pipe axis direction so as to be substantially along the bending direction of the packing portion located in the vicinity. According to this characteristic configuration, the curved pressing surface of the pressing protrusion causes the packing portion, which has a length corresponding to the pressing surface and is located in the vicinity of the second half joint body side, in association with the tightening operation by the fastener. Since the compression can be performed almost uniformly, the reliability of the pressure resistance performance and the water stop performance can be further improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIGS. 1 to 6 show a partition valve from a through hole 2 formed in a peripheral wall 1 of a fluid transport pipe A such as a water pipe in an uninterrupted state in which the flow of a fluid such as tap water is not stopped. A partitioning valve device is shown in which the body B is inserted into the fluid transport pipe A in the state of uninterrupted flow to shut off and close the flow passage in the pipe, and the pipe outer peripheral surface of the portion where the through hole 2 is formed is closed. The sealing case C provided with the surrounding connection joint structure of the present invention and the partitioning valve body B are arranged in the direction of the center line of the through hole 2 (the vertical direction in the first embodiment, hereinafter referred to as the valve rod axis P direction). (Described) and a valve rod 3 that moves in and out within a certain range along the above.

The hermetically sealed case C holds the upper half of the pipe peripheral wall 1 from the upper surface side, and the first half joint 5 made of casting, and holds the lower half of the pipe peripheral wall 1 from the lower surface side. Of the second half joint body 4 made of casting, which is mounted as described above, and the first half joint body 5, which is screwed to the female screw of the cylindrical threaded portion 5A having the opening 5e communicating with the through hole 2. A cylindrical shaft-shaped valve lid 6 that is held together and a cylindrical pressing case 7 that fastens and fixes the valve lid 6 to the first half joint body 5 are provided as main components.

The second half joint body 4 and the first half joint body 5 are respectively provided on one side of the second half joint body 4 and the first half joint body 5 along the tube axis X direction. Cylindrical connecting portions 4a and 5a for swingably opening and closing are connected to and with via bolts 8 and nuts 9 around the axis along the tube axis X direction. Split joint body 4 and first half split joint body 5
The second half joint body 4 and the first half joint body 5 in the closed posture are respectively attached to the bolts 10 on each of the other sides along the tube axis X direction.
-Connecting flange portions 4b and 5b for tightening and fixing with the nut 11 are provided in series. The first half-split joint body 5 and the second half-split joint body 4, which are fitted on the peripheral wall 1 of the fluid transport pipe A by the bolt 10 and the nut 11, are orthogonal or substantially orthogonal to the pipe axis X direction. A fastener D that is fastened and fixed from the direction in which it is formed is configured. Further, as shown in FIG. 6, on the inner surface of the first half joint body 5 corresponding to the pipe peripheral wall 1, there is provided a ring-shaped elastic packing 12 press-contacted around the through hole 2 on the outer peripheral face of the pipe peripheral wall 1. The holding annular recess 5c is formed in a state of opening toward the second half joint body 4 side, and is predetermined in the circumferential direction and the pipe axis X direction with respect to the outer peripheral surface of the pipe peripheral wall 1. Pipe receiving projections 5d, which come into contact with four portions spaced apart from each other, are integrally formed on the inner surface of the first half joint body 5 corresponding to the pipe peripheral wall 1. Further, the inner surface of the second half-split joint body 4 corresponding to the pipe peripheral wall 1 is contacted with the outer peripheral surface of the pipe peripheral wall 1 at four positions spaced at predetermined intervals in the circumferential direction and the pipe axis X direction. Pipe receiving projection 4
c is formed integrally with the second half-split joint body 4, and a part of the annular recess 5c of the first half-split joint body 5, that is, the second half when the outer circumferential wall 1 is sheathed. Split joint body 4
At a portion corresponding to the groove portion closest to the side, a virtual vertical line of the elastic packing 12 mounted in the annular recess 5c that is orthogonal to the pipe axis X direction while passing through the valve rod axis P. The lowermost packing part 12a that intersects the surface, in other words, the packing part 12a closest to the second half split joint body 4 side, is the bolt 10 and the nut 1 of the fastener D.
A pressing protrusion 4d, which is compressed in accordance with the tightening operation of 1, is integrally formed as a protrusion. The pressing surface b of the pressing protrusion 4d is formed as a horizontal flat surface along the tube axis X direction.

The annular recess 5c opens downward in the direction of the valve rod axis P (opens toward the second half joint body 4 side).
Therefore, when fluid pressure such as water pressure is applied to the upper surface side of the elastic packing 12 mounted in the annular recess 5c, the lowermost packing portion 12a of the elastic packing 12 is elastically deformed downward, and There is a possibility that the sealing performance will be deteriorated and the fluid will be leaked. However, if a retaining protrusion is formed on the inner surface of the first half joint body 5 corresponding to the pipe peripheral wall 1 to prevent the elastic deformation of the lowermost packing portion 12a of the elastic packing 12 below, the first retaining member is formed. Since a core or the like is required when casting the split joint body 5, the manufacturing cost is likely to increase. Therefore, as described above, the annular recess 5c on the first half joint body 5 side is opened downward in the direction of the valve stem axis P to facilitate the mounting of the elastic packing 12 and to prevent the first half joint body 5 from being mounted. Although the mold structure is simplified, the downward elastic deformation of the lowermost packing portion 12a of the elastic packing 12 due to the fluid pressure is caused by the pressing projection 4d formed on the second half joint body 4 side. While surely preventing contact with, the lowermost packing part 12 of the elastic packing 12 is pressed by the pressing projection 4d.
Since a can be compressed and the lowermost packing portion 12a side of the elastic packing 12 can be strongly pressed against the outer peripheral surface of the tube peripheral wall 1, good sealing performance is always maintained.

The pressing case 7 includes a first half joint body 5
A female screw 7a screwed onto a male screw 5g formed on the outer peripheral surface of the cylindrical threaded portion 5A, and an annular pressing portion 7b that abuts against an annular stepped portion 6a formed on the outer peripheral surface of the valve lid 6 from above. Are formed. The valve lid 6 is sealed (liquid-tight or air-tight) between a female screw 6b to which a male screw 3c formed on the upper portion of the valve rod 3 is screwed and an outer peripheral surface of the central portion of the valve rod 3. )
An annular groove 6c that holds each of the two O-rings 13 that seal in the state is formed. The first half joint body 5
A step portion 5f is formed on the inner surface of the cylindrical threaded portion 5A of FIG. 2A and on the portion opposite to the lower end surface of the valve lid 6 in the valve stem axis P direction. A sheet packing 1 for sealing in a hermetically (liquid-tight or air-tight) state between the lower end surface
4 are provided in a sandwiched state.

Next, the partition valve body B will be described. As shown in FIGS. 3 to 5, a rubber elastic seal member 15 inserted into the fluid transport pipe A from the through hole 2 is attached to the seal holding portion 3A on the tip end side of the valve rod 3, and The seal holding portion 3 of the valve rod 3 surrounded by the elastic sealing material 15.
A tapered annular pressing surface 3a is formed at the lower end of A toward the valve shaft axis P toward the lower end, and the elastic seal material 15 is provided at a portion corresponding to the upper portion of the seal holding portion 3A. An annular collar portion 3B that abuts on the upper end surface is formed to project. In addition, a shaft portion 16A of a movable pressing member 16 that presses a part of the elastic seal material 15 against the inner surface of the pipe in the insertion direction is provided in the mounting hole 3b formed at the axial center position of the seal holding portion 3A of the valve rod 3. The hemispherical head 16B formed on the lower end of the movable pressing member 16 is fitted and held so as to be slidable relative to each other in the direction of the valve stem axis P, and the elastic sealing material 15 is provided on the upper surface of the head 16B. Due to the contraction operation of the valve rod 3 and the movable pressing member 16 due to the elastic deformation, a part of the elastic sealing material 15 is directed between the annular pressing surface 3a of the valve rod 3 toward the inner surface of the pipe orthogonal to the insertion direction. An annular pressing surface 16a is formed which is bulged and elastically deformed. The annular pressing surface 16a of the movable pressing member 16 is formed as a taper surface further away from the valve stem axis P toward the lower end side, and in the state where the elastic seal material 15 is pressed against the inner surface of the pipe, the valve stick 3 is formed.
Of the annular pressing surface 3 a of the movable pressing member 16
A central position a in the direction of the valve stem axis P between the position a and a is located on a virtual center line Y passing through the tube axis X in a direction orthogonal to the insertion direction. The movable pressing member 1
In the annular groove 16b formed at the upper end of the shaft portion 16A of No. 6,
Elasticity such as rubber that slidably contacts the inner peripheral surface of the upper large-diameter hole portion of the mounting hole 3b of the seal holding portion 3A and frictionally holds the shaft portion 16A of the movable pressing member 16 at an arbitrary position of the upper large-diameter hole portion. The ring 17 is fitted and held. The cross-sectional shape of the outer peripheral surface of the seal holding portion 3A of the valve rod 3, the cross-sectional shape of the outer peripheral surface of the movable pressing member 16, and the valve rod 3
The cross-sectional shape of the outer peripheral surface of the elastic seal material 15 surrounding the seal holding portion 3A and the movable pressing member 16 is formed in a concentric circle centered on the valve rod axis P. That is, the entire valve rod 3 including the seal holding portion 3A and each of the shaft portions 16A of the movable pressing members 16 are formed in a round shaft shape, and the elastic seal material 15 is formed in a bottomed cylindrical shape. is there. The elastic seal material 15 is used for the seal holding portion 3 of the valve rod 3.
A and the projecting portion of the movable pressing member 16 are cloaked,
It is fixed to the lower surface of the collar portion 3B of the valve rod 3 or a part of the outer peripheral surface of the lower surface and the seal holding portion 3A continuous with the lower surface with an adhesive or the like.

When the handle 18 attached to the upper end of the valve rod 3 is rotated to screw the valve rod 3 downward with respect to the valve lid 6, the valve retainer 3 is attached to the seal holding portion 3A. The elastic sealing material 15 thus obtained is inserted into the fluid transport pipe A through the through hole 2 of the pipe peripheral wall 1 (see FIGS. 3 and 4). Furthermore,
As shown in FIG. 5, by screwing the valve rod 3 downward,
When the elastic sealing material 15 is elastically deformed while being pressed against the inner surface of the pipe in the insertion direction, the movable pressing member 16 fitted and held by the valve rod 3 contracts along the direction of the valve stem axis P along with the elastic deformation. Then, a part of the elastic sealing material 15 located between the annular pressing surface 16a of the movable pressing member 16 and the annular pressing surface 3a of the valve rod 3 is bulged and elastically deformed in a direction intersecting the insertion direction. , The elastic sealing material 15 which is elastically deformed by the bulge
Is pressed against the inner surface of the pipe in a direction intersecting the insertion direction. Therefore, since the movable pressing member 16 moves due to the elastic deformation of the elastic sealing member 15, the valve rod 3 and the movable pressing member 1 are moved.
It is not necessary to provide a linking mechanism for forcibly contracting 6 and 6, and the elastic sealing material 15 is pressed against the inner surface of the pipe in a direction intersecting the insertion direction with a sufficient pressure contact force to prevent leakage of the flow path in the pipe. It is possible to simplify the valve structure and reduce the manufacturing cost while securely partitioning without a valve.
Further, at the time of partitioning, the through hole 2 formed in the peripheral wall 1 is also closed by the elastic sealing material 15. A rust-proof lining layer 19 is formed on the inner peripheral surface of the fluid transport pipe A.

[Second Embodiment] FIG. 7 shows the connection joint structure of the fluid transport pipe A of the first embodiment in which the pressing surface b of the pressing protrusion 4d integrally formed on the second half joint body 4 is The inclined surface is located closer to the first half joint body 5 on the radially outer side. Due to the inclined pressing surface b of the pressing protrusion 4d, the valve rod shaft core P of the elastic packing 12 mounted in the annular recess 5c is moved along with the tightening operation of the fastener D by the bolt 10 and the nut 11. The lowermost packing portion 12a that intersects with an imaginary vertical plane that is orthogonal to the tube axis X direction when passing, in other words, the second
Packing portion 12a closest to the half joint body 4 side
Since the swelling can be efficiently bulged and deformed toward the outer peripheral surface side of the pipe peripheral wall 1, the reliability of the pressure resistance performance and the water stop performance can be further enhanced. The other configurations are the same as those of the first embodiment, and the same numbers are given to the same components and the description thereof is omitted.

[Third Embodiment] FIG. 8 shows the pressing surface b of a pressing projection 4d integrally formed on the second half joint body 4 in the connection joint structure of the fluid transport pipe A of the first embodiment. Of the elastic packing 12 held in the annular recess 5c, the packing portion 12 located close to the second half joint body 4 side.
The curved surface is formed so as to be substantially along the curve direction of a and is arcuately recessed toward the side away from the first half joint body 5 toward the central portion side in the pipe axis X direction. Then, by the curved pressing surface b of the pressing protrusion 4d, the bolt 10 of the fastener D.
With the tightening operation by the nut 11, the pressing surface b
Since it is possible to compress the packing portion 12a, which is located near the second half joint body 4 and has a length corresponding to, substantially evenly, it is possible to further improve the reliability of the pressure resistance performance and the water stop performance. The other configurations are the same as those of the first embodiment, and the same numbers are given to the same components and the description thereof is omitted. In addition, the pressing surface b of the pressing protrusion 4d is a packing portion 12 of the elastic packing 12 held in the annular recess 5c, which is located close to the second half joint body 4 side.
Along the center of the pipe axis X direction, the first half-split joint is curved in an arc shape toward the side away from the first half-split joint body 5 so as to be substantially along the bending direction of a. You may implement | achieve by forming in the inclined surface located near the body 5 side.

[Fourth Embodiment] FIG. 9 shows a branch pipe E provided in a through hole 2 formed in a peripheral wall 1 of a fluid transport pipe A such as a water pipe in an uninterrupted state in which the flow of a fluid such as tap water is not stopped. The connection joint structure for communicating connection is shown, and the connecting flange 5b of the casting 1st half-split joint body 5 and the lower half of the pipe peripheral wall 1 which are mounted so as to hold the upper half of the pipe peripheral wall 1 from the upper surface side. Those facing each other with the connecting flange 4b of the second half split joint body 4 made of casting, which is mounted so as to hold the part from the lower surface side,
The bolts 10 and the nuts 11 are respectively tightened and fixed from the direction along the axial center direction of the through hole 2. And
The first half-split joint body 5 and the second half-split joint body 4, which are fitted on the peripheral wall 1 of the fluid transport pipe A by the bolt 10 and the nut 11, are orthogonal or substantially orthogonal to the pipe axis X direction. A fastener D that is fastened and fixed from the direction in which it is formed is configured. Further, on the inner surface of the first half joint body 5 corresponding to the pipe peripheral wall 1, an annular recess 5c for holding a ring-shaped elastic packing 12 which is press-contacted around the through hole 2 on the outer peripheral surface of the pipe peripheral wall 1.
Is formed in a state of opening toward the second half-split joint body 4 side, and in the second half-split joint body 4, a part of the annular recess 5c of the first half-split joint body 5, That is,
Of the elastic packing 12 held in the annular recess 5c, the second half joint body is provided at a portion corresponding to the groove portion closest to the second half joint body 4 side when the outer circumferential wall 1 is enveloped. A pressing projection 4d is integrally formed so as to compress the packing portion 12a closest to the No. 4 side from the direction orthogonal to the tube axis X direction in accordance with the tightening operation of the fastener D with the bolt 10 and the nut 11. Has been done. The first
At the tip of the tubular portion 5B of the half joint 5 having the opening (branch flow path) 5e communicating with the through hole 2, the annular connecting flange 21 of the branch pipe E is provided with bolts and nuts. An annular connecting flange 5C that is fastened and fixed is continuously provided.

[Other Embodiments] In each of the above-described embodiments, the first half joint body 5 and the second half joint body 4 are detachable via bolts and nuts, which are an example of the fastener D. Although fixedly connected, the female flange may be formed on one of the connecting flanges to omit the nut. Also,
A cam type fastener may be used as the fastener D. The second split joint body 4 may be further divided into a plurality of pieces in the circumferential direction, and the split joint bodies may be detachably connected to each other with bolts, nuts or the like. The connection joint structure of the fluid transport pipe according to the present invention is not limited to being mounted on a liquid transport pipe such as a water pipe, but may be mounted on a gas transport pipe such as a gas pipe. The connection joint structure of the fluid transport pipe according to the present invention may be mounted in a state where the fluid in the pipe is stopped. In the above-described first embodiment, the fluid transport pipe A having the inner surface of the pipe has been described as an example, but the connection joint structure of the fluid transport pipe of the present invention has a fluid transport in which the inner surface of the pipe is not lined. It can also be applied to the pipe A. still,
Reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the above description.

[Brief description of the drawings]

FIG. 1 is an overall half-section front view showing a first embodiment.

FIG. 2 is a side view of the entire half section.

FIG. 3 is an enlarged sectional side view of a main part before insertion of an elastic sealing material.

FIG. 4 is an enlarged sectional side view of a main part when an elastic seal material is inserted into a pipe.

FIG. 5 is an enlarged cross-sectional side view of the main part when the elastic seal material is pressed against the inner surface of the pipe.

FIG. 6 is a plan view when the second half joint body and the first half joint body are opened.

FIG. 7 is an enlarged cross-sectional side view of the main part showing the second embodiment.

FIG. 8 is an enlarged front view of the main part showing the third embodiment.

FIG. 9 is a side view of an entire half section showing a fourth embodiment.

FIG. 10 is an overall half-section side view showing a conventional connection joint structure for a fluid transport pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe peripheral wall 2 Through hole 4 2nd half-joint body 4d Pressing protrusion 5 1st half-joint body 5c Annular recess 5e Opening 12 Elastic packing 12a Packing part A Fluid transport pipe X Pipe axis core D Fastener b Pressing surface

Claims (3)

[Claims] 1. A first half joint body (5) having an opening (5e) communicating with a through hole (2) formed in a peripheral wall (1) of a fluid transport pipe (A), and corresponding thereto. The second half joint body (4) is fastened from the direction orthogonal or almost orthogonal to the pipe axis (X) direction while being fitted over the pipe peripheral wall (1) of the fluid transport pipe (A). A ring-shaped member that is fastened and fixed with the tool (D) and is pressed against the inner peripheral surface of the first half joint body (5) around the through hole (2) on the outer peripheral surface of the pipe peripheral wall (1). Annular recess (5) holding the elastic packing (12)
c) is formed in a state of opening toward the second half joint body (4) side, and further, the second half half of the elastic packing (12) held in the annular recess (5c). A pressing protrusion (4d) that compresses the packing portion (12a) closest to the joint body (4) side by the tightening operation by the fastener (D) is formed in the second half joint body (4). Connection joint structure for fluid transportation pipes. 2. The pressing surface (b) of the pressing protrusion (4d)
The connecting joint structure for a fluid transport pipe according to claim 1, wherein the connecting joint structure is formed on an inclined surface located closer to the first half joint body (5) side toward the outer side in the pipe radial direction. 3. The pressing surface (b) of the pressing protrusion (4d)
Of the elastic packing (12) held in the annular recess (5c), so that it is substantially along the bending direction of the packing part (12a) located near the second half joint body (4) side. The connection joint structure for a fluid transport pipe according to claim 1 or 2, wherein the connection joint structure for the fluid transport pipe is formed on a curved surface away from the first half joint body (5) toward a central portion side in the axial core (X) direction.