JP2014088904A - Branch pipe connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch pipe connector that prevents relative movement such as opening of the division part of a housing even in a case where external force such as bending due to an earthquake acts on a branch pipe.SOLUTION: In a branch pipe connector that connects a branch pipe 10 along the division surface of a housing 2 divided into a plurality of division bodies so as to be mountable from a radial direction with respect to the outer peripheral surface of a fluid pipe 1, an annular branch pipe connection part 5 connected to the branch pipe 10 is formed integrally with a first division body 2a of the housing 2.

Description

  The present invention relates to a branch pipe connecting device, and more specifically, a branch disposed along a split surface of a housing divided into a plurality of split bodies so that the outer peripheral surface of a fluid pipe can be mounted in a radial direction. The present invention relates to a branch pipe connecting device for connecting pipes.

  In the conventional branch pipe connecting device, when an external force is applied in the direction in which the branch pipe is pulled out, the projection of the housing and the recess of the branch pipe are engaged, and the tapered surface formed in the recess and the outer surface of the projection Even if an external force acts on the branch pipe by pressing in the direction of tightening the mating surface of the housing formed in two cracks by bringing the wedge surface into contact with the tapered surface formed in In addition, an invention that prevents the two split surfaces of the housing from opening is known (see, for example, Patent Document 1).

  Further, in the conventional branch pipe connecting device, a connecting portion for connecting the branch pipe from the radial direction is provided between the divided casings, and the branch pipe is connected to the casing with an elastic sealing material interposed therebetween, An invention is known in which the branch pipe and the casing are configured to be relatively swingable by elastic deformation of the sealing material, thereby improving the earthquake resistance (see, for example, Patent Document 2).

Japanese Patent No. 4777074 (pages 2 to 3, FIGS. 2, 5, and 6) Japanese Patent No. 3447349 (2nd page, FIG. 4)

  However, the invention described in Patent Document 1 corresponds to the case where an external force is applied in the direction in which the branch pipe is pulled out, and cannot cope with the case where a bending moment is applied to the branch pipe. It was.

  Moreover, in patent document 2, it is limited to the relative rocking | fluctuation possible range by the elastic deformation of a sealing material, and when the bending which exceeds this acts on a branch pipe, the division | segmentation surface of a housing | casing will open. There was a problem.

  The present invention has been made paying attention to such problems, and can prevent relative movement such as opening of the divided portion of the housing even when an external force such as bending due to an earthquake or the like acts on the branch pipe. An object is to provide a branch pipe connecting device.

In order to solve the above-mentioned problem, the branch pipe connection device of the present invention includes:
In a branch pipe connecting device for connecting a branch pipe along a split surface of a casing that is split into a plurality of split bodies so that the outer periphery of the fluid pipe can be mounted from the radial direction, the first split of the casing The body is integrally formed with an annular branch pipe connecting portion connected to the branch pipe.
According to this feature, the strength of the branch pipe connection can be increased, and even when an external force such as bending due to an earthquake or the like acts on the branch pipe, the problem of relative movement such as opening of the dividing surface of the housing occurs. Therefore, a highly reliable branch pipe connection device can be provided.

The branch pipe connecting device of the present invention is
Both side surfaces of the annular branch pipe connecting part are sandwiched between a flange part formed on the outer peripheral surface of the branch pipe and a retaining member attached to an annular groove part formed on the tip side of the flange part. It is characterized by that.
According to this feature, the annular branch pipe connecting portion and the branch pipe can be securely fixed.

The branch pipe connecting device of the present invention is
The second divided body of the housing includes a support portion for supporting the annular branch pipe connecting portion, and the support portion of the second divided body and the annular branch pipe connecting portion are pipes of the branch pipe. It is characterized by being engaged through a concavo-convex structure formed in a direction substantially orthogonal to the axial direction.
According to this feature, since the annular branch pipe connecting portion is supported by the second divided body so that the movement of the branch pipe in the tube axis direction is restricted, the strength opposite to the bending force of the branch pipe increases. Even when a bending due to an earthquake or the like acts on the branch pipe, the bending force of the branch pipe can be reliably maintained.

The branch pipe connecting device of the present invention is
A flange portion for attaching a taper bolt for assisting sealing is provided on the outer peripheral surface of the annular branch pipe connecting portion, and the distal end side of the support portion of the second divided body is annular when the taper bolt attached to the flange portion is tightened. It is characterized by being in close contact with the outer peripheral surface of the branch pipe connecting portion.
According to this feature, the support portion of the second divided body and the annular branch pipe connection portion can be fluid-tightly connected.

The branch pipe connecting device of the present invention is
An annular flange portion that contacts an annular flange portion formed on the outer peripheral surface of the branch pipe is provided at a tip portion of the annular branch pipe connection portion, and the annular flange portion of the branch pipe connection portion and the annular flange of the branch pipe are provided. It is characterized by comprising a coupling member having a substantially U-shaped cross-section divided in the circumferential direction and fitted over the part.
According to this feature, the annular branch pipe connecting portion and the branch pipe can be firmly coupled.

The branch pipe connecting device of the present invention is
An arcuate valve body that moves along the circumferential direction of the fluid pipe is provided inside the housing, and a valve seat of the valve body is formed on an inner surface of the annular branch pipe connecting portion on the fluid pipe side. It is characterized by that.
According to this feature, since the surface of the valve seat is integrated without being divided, a branch pipe connecting device having excellent sealing performance can be obtained.

The branch pipe connecting device of the present invention is
The housing includes a continuous flow branching switching valve that selectively closes three openings of the fluid pipe and the annular branch pipe connecting part inside the casing, and the annular branch pipe connecting part is formed on the inner peripheral surface. An accommodating recess for accommodating an elastic sealing material to be mounted between the outer peripheral surface of the branch pipe and an annular flange part that contacts an annular flange part formed on the branch pipe at the distal end and the annular flange part An annular groove is provided on the outer peripheral surface on the base side, and one end is fitted in the annular groove, and the outer circumferential surface is fitted over the annular flange portion of the branch pipe connecting portion and the annular flange portion of the branch pipe. It is characterized in that it includes a divided coupling member having a substantially U-shaped cross section.
According to this feature, the annular branch pipe connecting portion and the branch pipe can be firmly coupled.

(A) is a front view which shows the 1st division body which comprises the housing | casing of the branch pipe connecting apparatus in Example 1, (b) is AA sectional drawing of (a), (c) Is a plan view of the same. (A) is a side view which shows the state which connects a branch pipe in the branch pipe connection apparatus in Example 1, (b) is a B arrow view of (a). It is a figure which shows the state to which the branch pipe was connected in the branch pipe connection apparatus in Example 1, Comprising: (a) is CC sectional drawing of (b), (b) is a side view, (c ) Is a plan view. It is a side view which shows the branch pipe connection apparatus in Example 2. FIG. It is a side view which shows the branch pipe connection apparatus in Example 3. It is a side view which shows the branch pipe connection apparatus in Example 4. FIG. 10 is a plan cross-sectional view showing a branch pipe connecting device in Embodiment 5.

  EMBODIMENT OF THE INVENTION The form for implementing the branch pipe connection apparatus which concerns on this invention is demonstrated below based on an Example.

  The branch pipe connection device according to the first embodiment will be described with reference to FIGS. 1 to 3. In the following, a fluid pipe is arranged in the direction from the left side to the right side in FIG. 1C, and a branch pipe is arranged on the lower side in FIG. 1C. The lower side of the drawing will be described as the front side (front side) of the branch pipe connecting device.

  As shown in FIG. 3, the branch pipe connection device of the present invention is provided along the split surface of the housing 2 that is split into a plurality of split bodies so that the outer peripheral surface of the fluid pipe 1 can be mounted from the radial direction. As shown in FIG. 1, an annular branch pipe connecting portion 5 for connecting to the branch pipe 10 is provided on one first divided body 2 a constituting the housing 2. The point that it forms integrally is the feature.

  In this embodiment, the housing 2 is composed of two bodies, a lower first divided body 2a and an upper second divided body 2b, but may be composed of three or more divided bodies. Further, as shown in FIG. 3, the other second divided body 2 b constituting the housing 2 is in contact with the upper half of the outer peripheral surface of the annular branch pipe connection portion 5, and the annular branch pipe connection portion 5 is provided. A support portion 6 for supporting is formed, and the branch pipe connecting portion 5 can be reinforced by the support portion 6.

  The fluid pipe 1 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and has an inner peripheral surface covered with a mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In this embodiment, the fluid in the fluid pipe is clean water, but is not limited to clean water in this embodiment. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas-liquid mixture of gas and liquid It does not matter.

  As shown in FIG. 3, the housing 2 fixedly attached to the outer peripheral surface of the fluid pipe 1 covers the outer circumference of the fluid pipe 1 in a sealing manner, and includes a first divided body 2a and a second divided body 2b. Are integrally fixed by a plurality of bolts 7 via flanges 3a and 3b, and are connected in a sealed manner.

  In addition, the code | symbol 50 shown in FIG. 1 is a sealing member for fluid-tightly connecting the 1st division body 2a and the 2nd division body 2b, Comprising: In the recessed part formed in the joining surface of the 1st division body 2a It is installed.

  As shown in FIG. 1, a branch pipe connecting portion 5 is integrally formed on the first divided body 2 a on the side connected to the branch pipe 10 and along the split surface. The branch pipe connecting portion 5 is different from the conventional half-split branch pipe connecting portion, and has an annular shape with the split surface as a center. For this reason, the upper half of the annular branch pipe connecting portion 5 protrudes upward from the flange 3a. The inner diameter of the annular branch pipe connecting portion 5 is set to be slightly larger than the outer diameter of the branch pipe 10 when the branch pipe 10 is connected to the inside. Furthermore, the annular branch pipe connecting portion 5 has a predetermined length in the pipe axis direction, that is, a length that can ensure a reliable connection relationship with the branch pipe 10, and the tip of the branch pipe 10 to be connected is The positional relationship is set so as to be substantially in contact with the outer peripheral surface of the fluid pipe 1.

  Here, a connection structure between the annular branch pipe connecting portion 5 and the branch pipe 10 will be described. In the present invention, the branch pipe means a pipe body or a pipe part of a connection body such as a valve connected to the branch pipe connection part so as to branch from the fluid pipe, for example, for branch connection provided with a gate valve The branch pipe portion is referred to as a branch pipe.

  As shown in FIG. 2, an annular seal mounting groove 9 for fluid-tightly connecting the branch pipe 10 is formed on the inner peripheral surface of the annular branch pipe connecting portion 5. An elastic sealing material 8 for sealing that is compressed between the two is mounted.

  In addition, an annular groove 12 for mounting the retaining member 11 is formed on the outer peripheral surface of the tip of the branch pipe 10, and further, the distance from the annular groove 12 in the pipe axis direction is the length of the branch pipe connecting portion 5. At the only position, a collar portion 13 is formed in contact with the tip of the annular branch pipe connecting portion 5. As shown in FIG. 2 (b), the retaining member 11 is composed of a plurality of arc-shaped members 11a, 11b, 11c,. 11a, 11b, 11c,... Are each provided with two screw holes 14, and adjacent arc-shaped members are joined together by an arc-shaped connecting member 15 having holes 16 formed at both ends. .

  In order to connect the annular branch pipe connecting portion 5 and the branch pipe 10, in the state before the second divided body 2b is joined to the first divided body 2a, as shown in FIG. The elastic seal material 8 is attached to the inner peripheral surface of the branch pipe connection portion 5 and inserted until the flange portion 13 of the branch pipe 10 contacts the tip of the branch pipe connection portion 5. In this state, the connecting members 15 are inserted into the circular grooves 12 at the distal end of the branch pipe 10 protruding from the branch pipe connecting portion 5 while the arc-shaped members 11a, 11b, 11c,. Then, the retaining member 11 is attached to the tip of the branch pipe 10. Both sides of the annular branch pipe connecting portion 5 are tightly attached to the retaining member 11 and the flange 13, and the annular branch pipe connecting portion 5 and the branch pipe 10 are securely connected.

  In this embodiment, a branch valve 22 is mounted on the branch pipe 10, and the fluid pipe 1 is perforated by inserting a cutter (not shown) into the branch pipe 10 in an uninterrupted state using the gate valve 22. Detailed description is omitted.

  As shown in FIG. 3, when the branch pipe 10 is connected to the annular branch pipe connecting portion 5 formed integrally with the first divided body 2a, the second divided body 2b is coupled to the first divided body 2a. Is done. When the second divided body 2b is joined to the first divided body 2a, the flanges 3a, 3b of both divided bodies are closely joined, and at the same time, the second divided body 2b is connected to the outer peripheral surface of the substantially upper half of the annular branch pipe connecting portion 5. The inner peripheral surface of the support portion 6 of the divided body 2b abuts to back up the annular branch pipe connection portion 5.

  A flange 17 is formed on the outer peripheral surface of the substantially upper half of the annular branch pipe connecting portion 5 that abuts the support portion 6, and a flange 17 is fitted on the inner peripheral surface of the support portion 6 correspondingly. A groove 18 is formed. When the first divided body 2a and the second divided body 2b are joined, the support portion 6 of the second divided body 2b and the annular branch pipe connecting portion 5 of the first divided body 2a are orthogonal to the tube axis direction. Since the hooks 17 and the grooves 18 formed in the first and second grooves 18 are engaged through the concavo-convex structure, the annular branch pipe connecting portion 5 is restrained from moving in the pipe axis direction of the branch pipe 10 by the second divided body 2b. Therefore, even when an external force such as bending or twisting due to an earthquake or the like acts on the branch pipe 10, the bending force of the branch pipe 10 can be reliably maintained. it can.

  In addition, a seal mounting groove 20 is formed on the inner peripheral surface of the support portion 6, and an elastic seal material 19 is attached thereto. For this reason, the inner peripheral surface of the support part 6 and the outer peripheral surface of the branch pipe connection part 5 are joined fluid-tightly.

  As shown in FIG. 3, in the state where the branch pipe 10 is connected to the annular branch pipe connecting portion 5, for example, when a bending moment is applied to the branch pipe 10 due to an external force such as an earthquake, the annular branch pipe connecting portion 5 has a large stress. However, in the present invention, since the branch pipe connection portion 5 is not a split structure such as a split structure but an integral structure that forms a ring, the problem that the branch pipe connection portion 5 is opened can be solved.

  In addition, since the inner peripheral surface of the support portion 6 of the second divided body 2b comes into contact with the outer peripheral surface of the substantially upper half of the annular branch pipe connecting portion 5, the substantially upper half of the annular branch pipe connecting portion 5 is supported by the support portion 6. The entire annular branch pipe connecting portion 5 is also reinforced.

  In particular, the support portion 6 of the second divided body 2b and the annular branch pipe connection portion 5 are engaged with each other through a flange 17 and a groove 18 formed in a direction orthogonal to the pipe axis direction of the branch pipe 10. The annular branch pipe connecting portion 5 is supported by the second divided body 2b so that the movement in the pipe axis direction is restricted, and the strength opposite to the bending force of the branch pipe 10 is increased. Even when an external force such as bending or twisting is applied, it can be reliably held against the external force acting on the branch pipe 10, and the problem of relative movement such as opening of the split surface of the housing 2 does not occur. A highly reliable branch pipe connection device can be provided.

  FIG. 4 is a side view showing the branch pipe connecting device according to the second embodiment. The same components as those of the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 4, the branch pipe connecting device includes a flange portion 27 for attaching a taper bolt 26 for assisting sealing to the outer peripheral surface of the annular branch pipe connecting portion 25 of the first divided body 2a. The front end side of the support portion 6 of the second divided body 2b is configured to be in close contact with the outer peripheral surface of the annular branch pipe connecting portion 5 by tightening the taper bolt 26 to be attached. The tip 26a of the taper bolt 26 is formed in a tapered shape, and the tip corner 6a of the support portion 6 is also formed in a taper shape. In addition, only one taper bolt for sealing as described above may be attached, or a predetermined plurality of taper bolts may be attached.

  The taper bolt 26 is screwed into a threaded portion 28 formed on the flange portion 27 so as to be movable in the tube axis direction. When the taper bolt 26 is moved toward the support portion 6, the tapered tip 26 a is moved. Abutting against the tapered tip end corner portion 6a of the support portion 6, the tip end side of the support portion 6 is pressed toward the outer peripheral surface of the annular branch pipe connecting portion 5 in the inner diameter direction. For this reason, while the inner peripheral surface at the front end side of the support portion 6 of the second divided body 2b is in close contact with the outer peripheral surface of the annular branch pipe connection portion 5, the annular branch pipe connection portion 5 is firmly fixed by the support portion 6. Will be held. Further, the support portion 6 is prevented from being detached from the outer peripheral surface of the annular branch pipe connecting portion 5.

  FIG. 5 is a side view showing the branch pipe connecting device according to the third embodiment. The same components as those of the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 5, the branch pipe connection device includes an annular flange portion 32 that abuts an annular flange portion 31 formed on the outer peripheral surface of the branch pipe 10 ′ at the tip of the annular branch pipe connection portion 30. A coupling member 33 having a substantially U-shaped cross section divided in the circumferential direction is provided to be fitted over the annular flange portion 32 of the connecting portion 30 and the annular flange portion 31 of the branch pipe 10 '. The connecting member 33 divided in the circumferential direction is mounted from the outside in the radial direction after the branch pipe 10 ′ is connected to the branch pipe connecting portion 30, and the fixing structure of the connecting member 33 in the circumferential direction is provided. For example, a well-known fixing means is conceivable in which a set screw is screwed into a screw hole provided in the dividing surface.

  In FIG. 5, the support portion 6 ′ of the second divided body 2 b is in contact with the outer peripheral surface of the annular branch pipe connection portion 30, and the annular flange portion 32 of the branch pipe connection portion 30 and the annular shape of the branch pipe 10 ′. Since the annular branch pipe connecting portion 30 and the branch pipe 10 'are firmly coupled by the coupling member 33 having a substantially U-shaped cross section that is fitted over the flange portion 31, the earthquake occurs in the branch pipe 10'. Even when bending due to, for example, acts, the bending force of the branch pipe 10 'can be reliably maintained.

  FIG. 6 is a side view showing the branch pipe connecting device according to the fourth embodiment. The same components as those of the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 6, the branch pipe connecting device includes an arcuate valve body 36 that moves along the circumferential direction of the fluid pipe 1 inside the housing 2, and the inner face of the annular branch pipe connecting portion 35 on the fluid pipe 1 side. Further, a valve seat 37 of the valve body 36 is formed. The fluid pipe 1 has a branching opening 1a.

  The second divided body 2 b includes a valve body 36 that can open and close a flow path with the branch pipe 40, and an operation shaft 38 that meshes with and moves the valve body 36. The valve body 36 is formed in an arc shape in a cross-sectional view. The valve body 36a is located on the annular branch pipe connecting part 35 side and opens and closes the flow path with the branch pipe 40. The valve body part 36a And a moving portion 36b located on the opposite side of the branching opening 1a. On the outer peripheral surface of the moving portion 36b, a plurality of concave and convex engaging portions 36c that engage with the rotating gear 39 are formed.

  In addition, a plurality of guide support portions 41 are provided on the inner walls of the first divided body 2a and the second divided body 2b so as to be disposed inside the valve body 36, with a predetermined distance therebetween. When the portion 41 abuts on the inner peripheral surface of the valve body 36, the valve body 36 is guided along the circumferential direction of the fluid pipe 1. The valve body 36 a is rotated through the rotation gear 39 by the operation of the operation shaft 38.

  On the inner surface of the annular branch pipe connecting portion 35 formed integrally with the first divided body 2b on the fluid pipe 1 side, a valve seat 37 having an arc shape in a side view contacting the outer peripheral surface of the valve body 36 is formed. Thus, in the present embodiment, the valve seat 37 can be provided in the annular branch pipe connecting portion 35 formed integrally with the first divided body 2b, compared with the case where the valve seat is provided on the branch pipe side. Since the surface of the valve seat 37 is integral with the valve body side, a branch pipe connecting device having excellent sealing performance can be obtained.

  FIG. 7 is a plan sectional view showing the branch pipe connecting device in the fifth embodiment. The same components as those in the previous embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 7, the branch pipe connection device includes a continuous flow branch switching valve V that selectively closes the three openings 46 a, 46 b, 46 c of the fluid pipe 1 and the annular branch pipe connection portion 45 inside the housing 2. The annular branch pipe connecting portion 45 is provided with an accommodating recess 43 for accommodating an elastic seal material 42 mounted between the outer peripheral surface of the branch pipe 40 'and formed at the tip of the branch pipe 40'. An annular flange portion 32 that comes into contact with the annular flange portion 31, and an annular groove 44 is provided on the outer peripheral surface on the base side of the annular flange portion 32. One end of the annular groove 44 is fitted into the annular groove 44, and 32 and the annular flange portion 31 of the branch pipe 40 'are provided with a coupling member 33 having a substantially U-shaped cross-section divided in the circumferential direction and fitted over the outer flange 31.

  A cylindrical cup-shaped valve housing 47 is formed in the housing 2, and a valve box 46 is mounted in the valve housing 47 via a sealing member 48. Each room is partitioned into three rooms through three openings 46a, 46b, and 46c that communicate with the pipe connecting parts 51 and 52 and the branch pipe connecting part 45. In FIG. 7, the switching valve main body 53 of the continuous flow branching switching valve V is in a state in which the openings 46 a and 46 b communicating with the fluid pipe connecting portions 51 and 52 are communicated and the opening 46 c communicating with the branch pipe connecting portion 45 is closed. .

  Between the left and right end portions of the housing 2 and the outer peripheral surfaces of the fluid pipe connecting portions 51 and 52, annular elastic seal members 54 are respectively fitted by push wheels 55 in order to connect the fluid tightly. Yes.

  As described above, the feature of the present invention in which the annular branch pipe connection portion 45 connected to the branch pipe 40 ′ is integrally formed on one first divided body 2 a constituting the casing 2 is the case 2. The present invention can also be applied to a branch pipe connecting device having a continuous flow branching switching valve V for selectively closing the three openings 46a, 46b, 46c of the fluid pipe 1 and the annular branch pipe connecting portion 45 inside. Since the branch pipe connection portion 45 is annular, the strength of the connection portion with the branch pipe 40 'can be increased.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Case 2a 1st division body 2b 2nd division body 3a, 3b Flange 5 Annular branch pipe connection part 6, 6 'Support part 8 Elastic seal material 9 Sealing groove 10, 10' Branch pipe 11 Member 12 annular groove 13 flange portion 15 connecting member 17 rod 19 elastic seal material 20 seal mounting groove 25 annular branch pipe connecting portion 26 taper bolt 27 flange portion 30 annular branch pipe connecting portions 31, 32 annular flange portion 33 coupling member 35 Annular branch pipe connection part 36 Valve body 37 Valve seat 40, 40 'Branch pipe 41 Guide support part 42 Elastic seal material 43 Housing recess 44 Annular groove 45 Annular branch pipe connection part 46 Valve box 47 Valve housings 48, 50 Sealing member 51, 52 Fluid pipe connection part 53 Switching valve main body 54 Elastic seal member

Claims (7)

  In a branch pipe connecting device for connecting a branch pipe along a split surface of a casing that is split into a plurality of split bodies so that the outer periphery of the fluid pipe can be mounted from the radial direction, the first split of the casing A branch pipe connection device characterized in that an annular branch pipe connection portion connected to the branch pipe is integrally formed on the body.   Both side surfaces of the annular branch pipe connecting part are sandwiched between a flange part formed on the outer peripheral surface of the branch pipe and a retaining member attached to an annular groove part formed on the tip side of the flange part. The branch pipe connection device according to claim 1.   The second divided body of the housing includes a support portion for supporting the annular branch pipe connecting portion, and the support portion of the second divided body and the annular branch pipe connecting portion are pipes of the branch pipe. The branch pipe connecting device according to claim 1 or 2, wherein the branch pipe connecting device is engaged through an uneven structure formed in a direction substantially orthogonal to the axial direction.   A flange portion for attaching a taper bolt for assisting sealing is provided on the outer peripheral surface of the annular branch pipe connecting portion, and the distal end side of the support portion of the second divided body is annular when the taper bolt attached to the flange portion is tightened. The branch pipe connection device according to claim 3, wherein the branch pipe connection device is closely attached to an outer peripheral surface of the branch pipe connection portion.   An annular flange portion that contacts an annular flange portion formed on the outer peripheral surface of the branch pipe is provided at a tip portion of the annular branch pipe connection portion, and the annular flange portion of the branch pipe connection portion and the annular flange of the branch pipe are provided. The branch pipe connecting device according to claim 1, further comprising a coupling member having a substantially U-shaped cross-section divided in a circumferential direction and fitted over the portion.   An arcuate valve body that moves along the circumferential direction of the fluid pipe is provided inside the housing, and a valve seat of the valve body is formed on an inner surface of the annular branch pipe connecting portion on the fluid pipe side. The branch pipe connecting device according to claim 5.   The housing includes a continuous flow branching switching valve that selectively closes three openings of the fluid pipe and the annular branch pipe connecting part inside the casing, and the annular branch pipe connecting part is formed on the inner peripheral surface. An accommodating recess for accommodating an elastic sealing material to be mounted between the outer peripheral surface of the branch pipe and an annular flange part that contacts an annular flange part formed on the branch pipe at the distal end and the annular flange part An annular groove is provided on the outer peripheral surface on the base side, and one end is fitted in the annular groove, and the outer circumferential surface is fitted over the annular flange portion of the branch pipe connecting portion and the annular flange portion of the branch pipe. The branch pipe connecting device according to claim 1, further comprising a coupling member having a substantially U-shaped cross section.

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