JP2018119559A - Flow channel forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow channel forming device capable of ensuring airtightness of a sealing material disposed between divided cases, and airtightness of an annular sealing material for sealing an outer periphery of a branch pipe when attaching and detaching the branch pipe to and from a branch opening of a case of branched structure.SOLUTION: In a flow channel forming device, a flow channel is formed by attaching and detaching a branch pipe 9 communicating with a fluid pipe 1 to and from a case that airtightly surrounds the fluid pipe 1 and includes a valve body inside in a state of an uninterrupted flow. In the flow channel forming device, the case comprises a plurality of divided cases 32 including flanges mutually connected via a sealing material 13, includes a branch opening 3a that is formed annularly by the mutually connected divided cases 32 while the branch pipe 9 is attached or detached via an annular sealing material 11, includes an outer peripheral part 10a closely in contact with the sealing material 13 and an inner peripheral part 10b closely in contact with the annular sealing material 11 in the branch opening 3a of the case, and includes a cylindrical body 10 into which the branch pipe 9 can be inserted.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a flow path forming apparatus that forms a flow path by surrounding a fluid pipe in a sealed manner and attaching and detaching a branch pipe communicating with the fluid pipe in a continuous flow state to a housing having a valve body therein.

  In a conventional flow path forming device, a casing having a branch opening that is connected to an outer peripheral surface of a fluid pipe through an elastic sealing member that is divided between the connection surfaces and is sealed. A fluid pipe is cut off in an uninterrupted state in this casing, and a valve body is installed, and a branch pipe that is closed by this valve body is connected to the branch pipe via an elastic annular sealing material. There is a device that forms a flow path that circulates between the fluid pipe and the branch pipe by connecting the seal material and the annular seal material in close contact with each other so that the branch opening is in a sealed state (for example, , See Patent Document 1).

JP-A-2016-44793 (5th page, 6th page, FIGS. 3 and 10)

  However, in Patent Document 1, when a branch pipe is attached to and detached from a branch opening formed by connecting a casing having a divided structure, a sealing material interposed between the split casings and the branch pipe As a result of the annular seal material for sealing the outer periphery of the pipe being in sliding contact with each other as the branch pipe is moved in the attaching / detaching direction, the seal material or the annular seal material may be displaced or twisted. There is a problem that the sealing performance of the forming apparatus may be affected.

  The present invention has been made paying attention to such a problem, and when the branch pipe is attached to and detached from the branch opening of the split structure casing, the sealing performance of the sealing material provided between the split casings is improved. Another object of the present invention is to provide a flow path forming device capable of ensuring the sealing performance of an annular sealing material that seals the outer periphery of the branch pipe.

In order to solve the above problems, the flow path forming device of the present invention is:
A flow path forming device that encloses a fluid pipe in a sealed manner and forms a flow path by attaching and detaching a branch pipe communicating with the fluid pipe in an uninterrupted flow state to a housing provided with a valve body inside,
The housing includes a plurality of divided housings having flanges connected to each other via a sealing material, and is formed in an annular shape by the divided housings connected to each other, and the branch pipe is attached and detached via the annular sealing material. Having a branch opening,
The branch opening of the housing includes an outer peripheral portion that is in close contact with the sealing material and an inner peripheral portion that is in close contact with the annular sealing material, and is provided with a cylindrical body into which the branch pipe can be inserted. It is said.
According to this feature, the cylindrical body is provided at a position interposed between the sealing material for sealing the divided casings constituting the casing and the annular sealing material for sealing the branch pipe, and the sealing material and the cylindrical shape are provided. Since the outer peripheral part of the body and the inner peripheral part of the annular sealing material and the cylindrical body are sealed separately and independently, the sealing material and the annular sealing material are in sliding contact with each other when the branch pipe is attached to or detached from the branch opening. Without causing misalignment or twisting, the flow path is formed while preventing leakage from the flange where the divided housings are connected to each other and the connection portion between the branch pipe and the branch opening and maintaining a sealed state. be able to.

The sealing material and the annular sealing material are provided at different positions in the axial direction of the cylindrical body.
According to this feature, since the sealing material and the annular sealing material sandwiched in the radial direction of the cylindrical body are provided at different positions in the axial direction of the cylindrical body, the cylindrical body may be unexpected in the radial direction. The possibility of giving a reaction force can be avoided.

The cylindrical body has a step portion that expands from the outer peripheral portion of the cylindrical body to the inner peripheral portion.
According to this feature, since the cylindrical body has a stepped portion in the radial direction, not only the structural strength can be increased, but also the sealing material is arranged on the outer peripheral portion of the cylindrical body, and the diameter is larger than that of the outer peripheral portion. Since the annular sealing material is disposed on the inner peripheral portion, the radial thicknesses of the sealing material, the cylindrical body, and the annular sealing material can be made uniform throughout.

The housing includes a movement restricting portion that restricts movement of the cylindrical body in the axial direction.
According to this feature, since the cylindrical body is restricted in movement in the axial direction by the movement restricting portion, the cylindrical body is not displaced in the axial direction when the branch pipe is fitted into the cylindrical body. The sliding contact in the axial direction between the material or the annular sealing material and the cylindrical body can be suppressed.

The housing includes a rotation restricting portion that restricts rotation of the cylindrical body in the circumferential direction.
According to this feature, since the cylindrical body is rotationally restricted in the circumferential direction by the rotation restricting portion, the cylindrical body is not displaced in the circumferential direction when the branch pipe is inserted into the cylindrical body. Further, the sliding contact in the circumferential direction between the sealing material or the annular sealing material and the cylindrical body can be suppressed.

It is a piping diagram using the flow-path formation apparatus in an Example. (A) is a top sectional view showing a channel formation device after a channel formation process, and (b) is a front view similarly. It is a figure which shows the condition which attaches a flow-path formation apparatus to a fluid pipe | tube. It is a plane sectional view showing the situation where a branch pipe is connected to a flow path forming device. (A) is a top view of the sealing material provided in a 2nd division | segmentation housing | casing, (b) is a side view similarly. (A) is a bottom view of the sealing material provided in a 1st division | segmentation housing | casing, (b) is a side view similarly. (A) is front sectional drawing of the flow-path formation apparatus which attached the fluid pipe cutting device, (b) is a partial cross section side view similarly. It is front sectional drawing of the flow-path formation apparatus which installed the valve member. It is front sectional drawing which shows the condition which fixes a valve member to a housing | casing. (A) is a top view which shows a flow-path formation apparatus, (b) is a front view similarly. (A) is a partial cross section side view which shows the flow-path formation apparatus in a modification, (b) is a plane sectional view which shows the flow-path formation apparatus in another modification.

  EMBODIMENT OF THE INVENTION The form for implementing the flow-path formation apparatus which concerns on this invention is demonstrated below based on an Example. For convenience of explanation, the left side of FIG. 1 is the upstream side of the existing fluid pipe, and the right side is the downstream side.

  A flow path forming apparatus according to an embodiment will be described with reference to FIGS. First, a method for forming a flow path using a flow path forming apparatus will be described with reference to FIGS. 1 and 2, and subsequently, a structure and each process of each part of the flow path forming apparatus with reference to FIGS. 1 to 11. Details will be described.

  As shown in FIG. 1, an existing fluid pipe 1 (hereinafter simply referred to as “fluid pipe 1”) used as a water supply is buried in the ground, and a plurality of branch pipes (not shown) are provided in the fluid pipe 1 respectively. These branch pipes are laid in each home / facility.

  The fluid pipe 1 is made of ductile cast iron, is formed in a substantially circular shape in cross section, and has an inner peripheral surface covered with an epoxy resin layer. The fluid pipe according to the present invention may be made of metal such as cast iron or steel, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the epoxy resin layer, and may be coated with, for example, mortar or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. Moreover, the materials of the casing 3, the valve member 5, the branch pipe 9, and the like, which will be described later, may be adapted to the above.

  The flow path forming device of the present invention is in a continuous flow state in consideration of the convenience of the supply area, for example, when a predetermined section of an existing fluid pipe is temporarily or permanently removed due to problems such as aging deterioration. It is applied along the following steps. In this embodiment, the fluid in the fluid pipe is clean water. However, the fluid is not limited to clean water in this embodiment. For example, industrial water, agricultural water, sewage, or a gas-liquid mixture of gas, gas, and liquid. It does not matter.

  First, the process of forming a flow path using the flow path forming device will be described. As shown in FIG. 1, the fluid pipe 1 constituting the existing flow path by the flow path F1, the flow path F2, and the flow path F3... Is located at a predetermined position across the section of the flow path F2 to be removed. The casings 3A and 3B having the branch openings 3a and the openings 3b and 3b are externally fitted to the fluid pipe 1 in a sealing manner, and communicate with the branch openings 3a and 3a. Is connected. Next, a part of the fluid pipe 1 inside the housings 3A and 3B is cut, and a valve member 5 comprising a valve body 7 and a valve box 6 capable of switching the flow path flows to the pipe cutting portion without interruption. Each is arranged in a state. The details of the work in the uninterrupted flow state will be described later.

  At this time, the valve body 7 in the valve box 6 is disposed at a position where the branch opening 3 a in the housing 3 is shielded. Therefore, in this state, the fluid still flows down in the order of the existing flow paths F1, F2, and F3.

  Next, a new flow path is provided by connecting the bypass pipe 8 between the branch pipes 9A and 9B in parallel with the existing flow path F2. That is, the branch pipe 9A, the bypass pipe 8, and the branch pipe 9B constitute a temporary flow path F2 '.

  Next, as shown in FIG. 1, the valve members 5 of the housings 3A and 3B are respectively rotated so that the valve bodies 7 and 7 shield the flow path F2 and open the temporary flow path F2 ′. . By this operation, the fluid flowing down from the upstream flow path F1 flows down to the flow path F3 via the branch pipe 9A, the bypass pipe 8 and the branch pipe 9B, that is, the temporary flow path F2 '.

  Thereafter, in the present embodiment, the fluid pipe 1 in the section of the flow path F2 is cut at a predetermined position, and a new fluid pipe (not shown) is connected to the pipe cutting portion to form a new flow path F2. In addition, you may remove the fluid pipe | tube 1 which comprised the existing flow path F2 by attaching a pipe cap, a pipe stopper, etc. which are not shown in figure as a closure member to a pipe cutting part. That is, the flow path F2 'may be a new flow path, and the flow path may be switched from the flow path F1 to the flow path F2' and the flow path F3.

  Next, the valve members 5 of the casings 3A and 3B are respectively rotated so that the valve bodies 7 and 7 open the newly installed flow path F2 and shield the installed flow path F2 '. Further, as shown in FIG. 2, the branch pipes 9A and 9B and the bypass pipe 8 are removed, and a pipe plug 18 is attached in a sealed manner to the branch openings 3a of the housings 3A and 3B from which the branch pipes 9A and 9B have been removed. .

  By performing the above steps, an erected flow path F2 ′ composed of the branch pipes 9A and 9B and the bypass pipe 8 is formed as a temporary alternative flow path for the existing flow path F2 while maintaining the uninterrupted flow state. However, by replacing the existing flow path F2 with the new flow path F2, the pipe laying replacement work is possible in this embodiment.

  Next, the flow path forming apparatus according to the present invention will be described. The flow path forming device includes a housing 3 having a divided structure and connected via seal members 13, 14, a valve member 5 disposed in the housing 3, and a branch opening 3 a of the housing 3. It is mainly comprised from the cylindrical body 10 mentioned later arrange | positioned, and the cyclic | annular sealing material 11 provided in this cylindrical body 10. FIG.

  As shown in FIG. 2, the housing 3 is a so-called split T-shaped tube, and in this embodiment, the housing 3 is divided into two parts including a first divided housing 31 and a second divided housing 32 in the radial direction of the fluid pipe 1. By connecting these divided casings 31 and 32 to each other, the openings 3b and 3b along the outer periphery of the fluid pipe 1 and the branch opening 3a along the outer periphery of the branch pipe 9 are formed. It is configured.

  A fluid pipe cutting device 50, a valve member insertion device 70, and the like, which will be described later, can be attached to the flange portion 34 positioned at the upper portion of the housing 3. On the other hand, as shown in FIG. 7, the lower portion of the housing 3 has a mortar-shaped housing bottom, and a discharge hole 35 is formed at the center of the housing bottom. The discharge hole 35 can be connected to a plug 37, a valve 36, or the like, and can discharge the fluid filled in the housing 3 and impurities contained in the fluid through a series of operations.

  In the present embodiment, the first divided casing 31 that constitutes the upper part of the casing 3 and the second divided casing 32 that constitutes the lower part will be described. However, the dividing direction of the casing is not limited to top and bottom, It may be a horizontal direction or a predetermined angle of inclination. Further, the number of divisions may be three or more. Similarly, the piping direction of the fluid pipe 1 is not limited to the horizontal direction, and may be, for example, the vertical direction. Furthermore, the cutting direction of the cutter, which will be described later, is not limited to the vertical direction, and may be, for example, a horizontal direction.

  The valve member 5 will be described with reference to FIGS. 2 and 10. The valve member 5 is fastened and fixed to the flange portion 34 of the housing 3 by bolts and nuts 5q via the upper lid 5r. The valve member 5 includes a valve operating shaft 5s on the upper portion of the upper lid 5r. By rotating the valve operating shaft 5s while visually checking the operation memory 5t, the internal valve body 7 is rotated. The internal flow path can be switched. In addition, when the torque when rotating the valve body 7 of the valve member 5 is large, the valve body 7 of the valve member 5 is operated with a small torque by attaching a speed reducer (not shown) via the upper lid 5r. You can also.

  Next, the valve body 7 provided in the valve member 5 will be described. The valve body 7 has a structure including a rotating shaft 7s in the center and a valve portion 7t having a sector shape of approximately 90 °. As the rotary shaft 7s rotates, the valve portion 7t also rotates, and the opening and closing of the openings 3b, 3b, and 3a provided on the upstream side, the downstream side, and the branch side of the valve box 6 can be switched. Further, a sealing member is interposed between each opening and between the valve box 6 and the housing 3, and fluid flows down except for the opening opened by the valve body 7. Sealed to prevent.

  Next, the installation process of the flow path forming apparatus in the present embodiment will be described in detail. First, as shown in FIGS. 2 and 3, a first divided housing 31 and a second divided housing 32 are externally fitted from above and below to the fluid pipe 1 and a cylindrical body 10 to be described later. , 32 are tightened with a plurality of bolts and nuts 19. Sealing members 14 and 13 are provided at the connecting portions of the first divided casing 31 and the second divided casing 32, respectively, and the casing 3 constituted by these divided casings 31 and 32 is a fluid. Attached in a sealed manner to the tube 1 and the tubular body 10 (see FIGS. 5 and 6).

  More specifically, as shown in FIG. 5, the sealing material 13 provided in the second divided housing 32 is made of an elastic material, is formed in a substantially semicircular shape, and has a branch opening 32 a of the second divided housing 32. An arc portion 13a arranged along the inner peripheral surface, and an arc portion 13b arranged along the inner peripheral surface of the openings 32b, 32b of the second divided casing 32, continuously from both ends of the arc portion 13a. 13b and the extending portion 13c disposed along the facing surface of the flange 32c of the second divided housing 32 are formed integrally and endlessly.

  As shown in FIG. 6, the sealing material 14 provided in the first divided housing 31 is an end-like arc member made of an elastic material and formed in a substantially semicircular shape, It arrange | positions along the internal peripheral surface of the branch opening part 31a of the housing | casing 31, and the internal peripheral surface of the opening parts 31a and 31a of the 1st division | segmentation housing | casing 31, respectively.

  These sealing materials 13 and 14 are formed by joining the flanges 31c and 32c of the first divided housing 31 and the second divided housing 32 to each end of the arc portion 13a of the sealing material 13 and the sealing material 14. Each end is closely ring-shaped along the branch opening 3a, and similarly, each end of the arc portion 13b of the sealing material 13 and each end of the sealing material 14 is closely ring-shaped along the opening 3b. Formed.

  Next, as shown in FIG. 4, in the branch opening 3 a of the housing 3, from the circular arc portion 13 a of the sealing material 13, the sealing material 14, and a cylindrical metal material in close contact with the annular sealing material 11 described later. A cylindrical body 10 is provided. More specifically, the cylindrical body 10 includes a circular arc portion 13a of the sealing material 13 formed in an annular shape in the branch opening 3a, an outer peripheral portion 10a in close contact with the sealing material 14, and a branch opening portion that is more than the outer peripheral portion 10a. The inner peripheral part 10b provided with the recessed part 10c which is arrange | positioned in the axial direction of 3a at the opening end side, and fits the cyclic | annular sealing material 11 mentioned later is comprised.

  Further, the cylindrical body 10 is formed with a stepped portion 10d that extends from the outer peripheral portion 10a to the inner peripheral portion 10b, and the inner peripheral portion 10b of the cylindrical body 10 has an outer diameter larger than that of the outer peripheral portion 10a. The cylindrical body 10 has a diameter and is fitted in an annular recess 3e formed in the circumferential direction on the inner peripheral surface of the branch opening 3a. It is arranged in a state where the movement of is restricted. Here, the annular recess 3e of the housing 3 constitutes a movement restricting portion of the present invention.

  The cylindrical body 10 is not limited to a metal material but may be a resin material or the like, but has a higher rigidity than the sealing materials 13 and 14 and the annular sealing material 11 and a coefficient of friction than these sealing materials. Is preferably a low material.

  Further, the annular sealing material 11 provided on the inner peripheral portion 10b of the cylindrical body 10 is formed in a bulb shape in the outer diameter direction continuously with the valve portion 11a bulging in a spherical shape in a sectional view. And a fitting portion 11b that fits into the concave portion 10c of the inner peripheral portion 10b.

  Hereinafter, as shown in FIG. 3, the process of attaching the housing 3 to the fluid pipe 1 in a sealed manner will be described in detail. First, the openings 31b and 31b of the first divided casing 31 are covered with the upper part of the fluid pipe 1, and the openings 32b and 32b of the second divided casing 32 are covered with the lower part of the fluid pipe 1, and further these first divided casings are covered. The cylindrical body 10 provided with the annular sealing material 11 is interposed in the annular recess 3e of the branch opening 3a formed in an annular shape by the body 31 and the second divided housing 32.

  Next, the flange 31c of the 1st division | segmentation housing | casing 31 and the flange 32c of the 2nd division | segmentation housing | casing 32 are made to approach, and the some volt | bolt nut 19 inserted through the bolt hole formed in this flange 31c, 32c is fastened. Thus, the housing 3 is constructed. Further, as a result of the bolts and nuts 19 being fastened, the sealing materials 13 and 14 are clamped, so that the branch opening 3 a is sealed at the outer periphery of the cylindrical body 10, and the openings 3 b and 3 b are sealed at the outer periphery of the fluid pipe 1. Is done.

  Next, as shown in FIG. 4, the branch pipe 9 is inserted into the branch opening 3 a of the housing 3. More specifically, the branch tube 9 includes an insertion port 9a formed on one end side in the axial direction, a flange 9b projecting in the outer diameter direction on the rear side in the insertion direction from the insertion port 9a, and an axial direction And a connecting portion 9c formed on the other end side. Further, the insertion portion 9a has an outer diameter smaller than that of the connection portion 9c, and further has a taper shape toward the insertion tip.

  As a result of inserting the insertion port 9a of the branch pipe 9 into the cylindrical body 10 provided in the branch opening 3a, the annular sealing material 11 provided in the cylindrical body 10 is pinched, The branch opening 3 a is sealed at the outer periphery of the branch pipe 9. The branch tube 9 is inserted to a predetermined position where the flange portion 9b abuts on the distal end surface of the branch opening 3a, and over-insertion of the branch tube 9 is restricted by the distal end surface.

  Thus, the cylindrical body 10 is located at a position interposed between the sealing materials 13 and 14 that seal the divided housings 31 and 32 constituting the housing 3 and the annular sealing material 11 that seals the branch pipe 9. Since the sealing members 13 and 14 and the outer peripheral portion 10a of the cylindrical body 10 and the annular sealing material 11 and the inner peripheral portion 10b of the cylindrical body 10 are separately and independently sealed, the branch pipe 9 is branched. The flanges 31c and 32c to which the divided casings 31 and 32 are connected to each other without causing positional displacement and twisting without causing the seal materials 13 and 14 and the annular seal material 11 to be in sliding contact with each other when being attached to and detached from the opening 3a. And the flow path can be formed while preventing leakage from the connecting portion between the branch pipe 9 and the branch opening 3a and maintaining a sealed state.

  Further, since the sealing materials 13 and 14 and the annular sealing material 11 that are sandwiched in the radial direction of the cylindrical body 10 are provided at different positions in the axial direction of the cylindrical body 10, the radial direction with respect to the cylindrical body 10 It is possible to avoid the possibility of giving unexpected reaction force.

  Further, since the cylindrical body 10 has the radial step portion 10d, not only the structural strength can be increased, but also the sealing materials 13 and 14 are arranged on the outer peripheral portion 10a of the cylindrical body 10 and are further expanded than the outer peripheral portion 10a. Since the annular sealing material 11 is arranged on the inner peripheral portion 10b having a diameter, the radial thicknesses of the sealing materials 13, 14, the cylindrical body 10, and the annular sealing material 11 can be uniformized as a whole.

  Furthermore, since the cylindrical body 10 is restricted in movement in the axial direction by the annular recess 3e as a movement restricting portion, the cylindrical body 10 is displaced in the axial direction when the branch pipe 9 is inserted into the cylindrical body 10. The sliding contact in the axial direction between the sealing members 13 and 14 or the annular sealing member 11 and the cylindrical body 10 can be suppressed without occurring.

  After the branch pipe 9 is inserted into the branch opening 3 a as described above, the split ring fixing ring 15 is fitted to the outer peripheral surface of the branch pipe 9. The fixing ring 15 is provided with a locking recess 15a on the inner peripheral surface thereof, and the locking recess 15a is housed so as to be bridged between the flange 9b of the branch pipe 9 and the end 3d of the branch opening 3a. By fastening the arc-shaped split members constituting the fixed ring 15 of the split structure with a fastening member (not shown), the retaining recess 15a restricts the branch pipe 9 from coming out of the housing 3.

  The tube plug 18 described with reference to FIG. 2 includes an insertion portion 18a and a flange portion 18b that are formed in substantially the same manner as the branch tube 9, and a closing portion 18c that closes the branch opening portion 3a. 15 is fixed to the branch opening 3a.

  As shown in FIG. 7B, the connection portion 9c, which is the other end of the branch pipe 9, has a tube cap 16 that closes the opening of the connection portion 9c, and a bolt and nut 17a attached to the tube cap 16. A fastening ring 17 to be fastened is provided. Although not shown in particular, the fixing ring 17 is provided with a locking claw on its inner peripheral surface, and the tip of the locking claw pressed by the push bolt 17 b bites into the outer peripheral surface of the branch pipe 9. The detachment of the tube cap 16 from the branch tube 9 is restricted.

  Further, as shown in FIG. 7A, the fixed member 33 having a divided structure is also fitted over the ends of the openings 3 b and 3 b to which the fluid pipe 1 is connected in the circumferential direction. The fixing member 33 is provided with a locking claw 33 a on its inner peripheral surface, and the tip of the locking claw 33 a bites into the outer peripheral surface of the fluid pipe 1, so that the fluid pipe 1 comes out of the housing 3. Is regulated.

  Next, the fixed flange main body 20, the work valve main body 40, and the fluid pipe cutting device 50 are attached to the upper portion of the flange portion 34 of the first divided housing 31. Here, a sealing member is inserted into a joint surface between the fixed flange portion 21 and the flange portion 34 of the fixed flange main body 20, and is fastened by a bolt and a nut (not shown), whereby the fixed flange portion 21 and the flange portion 34. And is sealed. In the radial direction of the fixed flange portion 21, a plurality of presser screws 22 are hermetically attached at a predetermined interval in the circumferential direction, and when the valve member 5 is inserted into the divided housing 3 as will be described later. In addition, the valve member 5 can be temporarily fixed.

  The joint surface of the work valve body 41 and the fixed flange main body 20 of the work valve main body 40 is inserted with a seal member and tightened with a bolt, so that the work valve main body 40 and the fixed flange main body 20 are sealed. A work valve 42 that can be opened and closed between the housing 3 and the fluid pipe cutting device 50 by being slid horizontally is attached to the work valve housing 41 of the work valve main body 40 in a sealed manner.

  Further, the joint surface between the fluid pipe cutting device 50 and the work valve main body 40 is inserted with a seal member and tightened by bolts and nuts (not shown). Sealed. Further, a cutter 52 attached to the cutter shaft 54 is attached to the cutting device casing 51 in a sealing manner so as to be movable up and down and rotatable. The cutter 52 and the cutter shaft 54 can be rotationally driven from the outside of the fluid pipe cutting device 50 by a driving device (not shown).

  When the mounting of the fixed flange main body 20, the work valve main body 40, and the fluid pipe cutting device 50 to the flange portion 34 of the first divided housing 31 is completed, the fluid pipe 1 is continuously flowed by the cutter 52 with the work valve 42 opened. Disconnect in state. Since the cutter 52 has a cylindrical shape, as shown in FIG. 1, the tube cutting portion of the fluid pipe 1 is formed in an arc shape along the cylindrical cutter when viewed from the cylindrical axis direction of the cutter 52. . As shown in FIG. 7, the chips generated when cutting the existing fluid pipe 1 are operated together with the fluid by operating the valve 36 attached to the discharge hole 35 provided in the center of the divided housing lower part 32. Discharged.

  Next, after cutting the fluid pipe 1, the cutter 52 is raised and the work valve housing 41 is closed by the work valve 42, so that the fluid pipe 1 is sealed in the housing 3 in a cut state. Thereafter, the fluid pipe cutting device 50 is removed from the work valve main body 40, and the cutting work of the fluid pipe 1 is finished.

  Although not shown in particular, after the cutting operation of the fluid pipe 1, a rust preventive member inserting device is hermetically attached to the upper portion of the work valve body 40, and the rust preventive member inserting device is bent along the pipe cutting portion of the fluid pipe 1. You may make it attach a shape antirust member.

  Next, as shown in FIG. 8, the valve member insertion device 70 is attached to the upper portion of the work valve main body 40 in a sealed manner. The valve member insertion device 70 includes an insertion device housing 74, an insertion shaft 75, a holding portion 71 that holds the valve member 5 at one end of the insertion shaft 75, and a screw portion that is screwed into the other end of the insertion shaft 75. (Not shown), provided with a handle (not shown) for rotating the screw portion, rotating the handle to raise and lower the insertion shaft 75, and inserting and removing the valve member 5 from the housing 3 Can do.

  And if the valve member 5 is installed in the housing | casing 3 by the valve member insertion apparatus 70, the presser screw 22 provided in the fixed flange main body 20 will be screwed inward, and the valve member 5 will be temporarily fixed. In this state, the housing 3 and the valve member 5 are sealed by the sealing member 38.

  Thereafter, the fluid in the valve member insertion device 70 is discharged, the insertion device lid 72 is removed, the fixing of the holding portion 71 and the insertion shaft 75 is released from the work hole 73, and the valve member insertion device 70 is moved to the work valve main body 40. Remove from.

  Then, as shown in FIG. 9, a predetermined jig 44 inserted from above the work valve main body 40 is used to slide a fixing member 39 slidably provided on the upper surface of the valve lid to the outer side, so that the first divided housing is provided. The valve member 5 is fixed to the first divided housing 31 by the fixing member 39 by being fitted into a recess provided on the inner surface of the body 31. Next, the presser screw 22 is released, the fixed flange main body 20 and the work valve main body 40 are removed, and the holding portion 71 of the valve member insertion device 70 is removed from the valve member 5. When the presser screw 22 is released, for example, a flange 45 that covers the work valve housing 41 is used to prevent the members from being galvanized by the pressure of the internal fluid. It is preferable to perform the release while pressing downward.

  Further, as shown in FIG. 10, the upper lid 5r is attached to the flange portion 34 of the divided casing upper portion 31, and is fastened with bolts and nuts 5q. The flow path forming apparatus according to the present invention is configured by the above steps.

  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.

  For example, as a modification of the present invention, as shown in FIG. 11 (a), a convex portion 10g that bulges in the outer diameter direction is provided on the outer peripheral surface of the cylindrical body 10 in one or a plurality of predetermined locations in the circumferential direction. And a concave portion 3g that expands in the outer diameter direction is formed on the convex portion 10g in the circumferential direction on the inner peripheral surface of the branch opening 3a of the casing 3 that faces the convex portion 10g of the cylindrical body 10. A corresponding predetermined number is formed, and the convex portion 10 g of the cylindrical body 10 may be configured to fit into the concave portion 3 g of the housing 3. According to such a configuration, the convex portion 10g of the cylindrical body 10 is engaged with the concave portion 3g of the casing 3 in the circumferential direction, whereby the circumferential rotation of the cylindrical body 10 with respect to the casing 3 is restricted. The Here, the recess 3g of the housing 3 constitutes a rotation restricting portion according to the present invention.

  Thus, since the cylindrical body 10 is rotationally restricted in the circumferential direction by the concave portion 3g of the casing as the rotational restricting portion, when the branch pipe 9 is inserted into the cylindrical body 10, the cylindrical body 10 is A sliding contact in the axial direction between the sealing material or the annular sealing material and the cylindrical body can be suppressed without causing a positional shift in the axial direction.

  Further, for example, as another modification of the present invention, as shown in FIG. 11 (b), a protrusion protruding in the insertion direction of the tube plug 18 on the flange portion 18 b bulging in the outer diameter direction of the tube plug 18. 18h projects in one or a plurality of predetermined locations in the circumferential direction, and a recess 3h projects in the circumferential direction on the opening end surface of the branch opening 3a of the housing 3 that faces the projection 18h of the tube plug 18. A predetermined number corresponding to the portion 18 h may be formed, and the convex portion 18 h of the tube plug 18 may be configured to fit into the concave portion 3 h of the housing 3. According to such a configuration, the convex portion 18 h of the tube plug 18 is engaged with the concave portion 3 h of the housing 3 in the circumferential direction, whereby the circumferential rotation of the tube plug 18 with respect to the housing 3 is restricted.

DESCRIPTION OF SYMBOLS 1 Existing fluid pipe 3 Case 3a Branch opening 3e Annular recessed part (movement control part)
3g Concave part (rotation restricting part)
5 Valve member 7 Valve body 8 Bypass pipe 9 Branch pipe 10 Cylindrical body 10a Outer peripheral part 10b Inner peripheral part 10c Concave part 10d Step part 10g Convex part 11 Annular sealing material 13 Sealing material 14 Sealing material 16 Pipe cap 18 Tub plug 20 Fixing flange Main body 31 First divided housing 32 Second divided housing 31a, 32a Branch opening 31b, 32b Opening 31c, 32c Flange 40 Work valve body 50 Fluid pipe cutting device 70 Valve member insertion device

Claims (5)

A flow path forming device that encloses a fluid pipe in a sealed manner and forms a flow path by attaching and detaching a branch pipe communicating with the fluid pipe in an uninterrupted flow state to a housing provided with a valve body inside,
The housing includes a plurality of divided housings having flanges connected to each other via a sealing material, and is formed in an annular shape by the divided housings connected to each other, and the branch pipe is attached and detached via the annular sealing material. Having a branch opening,
The branch opening of the housing includes an outer peripheral portion that is in close contact with the sealing material and an inner peripheral portion that is in close contact with the annular sealing material, and is provided with a cylindrical body into which the branch pipe can be inserted. A flow path forming apparatus.   The flow path forming device according to claim 1, wherein the sealing material and the annular sealing material are provided at different positions in the axial direction of the cylindrical body.   The flow path forming device according to claim 2, wherein the cylindrical body has a stepped portion that expands from the outer peripheral portion of the cylindrical body to the inner peripheral portion.   The flow path forming device according to any one of claims 1 to 3, wherein the casing includes a movement restricting portion that restricts movement of the cylindrical body in the axial direction.   The flow path forming device according to claim 1, wherein the casing includes a rotation restricting portion that restricts rotation of the cylindrical body in a circumferential direction.

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