JP2013113426A - Method for introducing operation tool and attaching tool used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for introducing a miniaturized operation tool, in which an opening portion of an enclosure after the operation tool is introduced to the inside of the enclosure is not projected outwardly; and an attaching tool used therefor.SOLUTION: The method for introducing an operation tool 9 for shutting off a fluid in a fluid pipe 1 in an enclosure 2 into the enclosure 2 through a case 3 and an attaching tool 4 using the enclosure 2 hermetically attached to the fluid pipe 1, a case 3 equipped with a flange in communication with the opening of the enclosure 2 and the attaching tool 4 protruded outward from the opening portion 2a of the enclosure 2 and provided with at least a flange portion 4a connected to a flange 3a of the case 3, in which the attaching tool 4 is detachably disposed between the opening portion 2a of the enclosure 2 and the case 3, the operation tool 9 is introduced into the enclosure 2 through the case 3 and the attaching tool 4, and the case 3 and the attaching tool 4 are taken out from the opening portion 2a of the enclosure 2.

Description

  The present invention uses a case that is hermetically attached to a fluid pipe and a case body that includes a flange that communicates with an opening of the case, and a working tool for performing a predetermined operation in the case. The present invention relates to a working tool introduction method that is introduced into a housing through a body, and an attachment used at that time.

  In a conventional work tool introduction method, a case body including a valve box for a work valve is attached to an opening of a T-shaped pipe (housing) that is attached to a water distribution pipe (fluid pipe) in a sealed manner. A drilling device, which is an arranged work tool, is introduced into a T-shaped tube, and a water distribution tube in the T-shaped tube is drilled (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 60-39591 (page 4, FIG. 7)

  However, in Patent Document 1, since the T-shaped tube attached to the water distribution pipe has a flange projecting outward in order to connect to the case body, the case body was removed by drilling. There is a problem that the flange of the T-shaped pipe left behind interferes with the excavation work of the ground around the water distribution pipe or corrodes due to deterioration over time.

  The present invention has been made paying attention to such a problem, and the work tool introduction method in which the opening of the housing after the work tool is introduced into the inside is reduced without projecting outward, and at that time It aims at providing the fixture used for.

In order to solve the above-mentioned problem, the work tool introduction method of the present invention includes:
A housing that is hermetically attached to the fluid pipe, a case body that includes a flange that communicates with an opening of the housing, and that projects outward from the opening of the housing and is connected to the flange of the case body. And a work tool introduction method for introducing a work tool for performing a predetermined work in the housing into the housing through the case body and the attachment tool. And
The mounting tool is detachably interposed between the opening of the housing and the case body,
Introducing the working tool into the housing through the case body and the fixture;
The case body and the fixture are removed from the opening of the housing.
According to this feature, after the introduction of the work tool for performing a predetermined work in the housing is completed, the mounting tool including the flange portion with the case body protruding from the opening of the housing is attached to the opening of the housing. By removing from the housing, it is possible to provide a housing having a reduced-size opening that suppresses outward protrusion without providing a flange with the case body in the opening itself.

The work implement introducing method of the present invention is:
The fixture further includes a locking portion that is detachably locked to the outer surface of the opening of the housing.
According to this feature, by locking the locking portion of the fixture to the outer surface of the opening of the housing, this area can be secured for the work tool without using the inner area of the opening, It is easy to attach and detach the fixture to the outer surface of the housing.

The work implement introducing method of the present invention is:
Introducing the working tool into the housing through the case body and the fixture;
The work tool is installed in the housing, and a holding tool for holding the work tool in the housing is provided in an opening of the housing.
According to this feature, by providing the holding tool installed in the housing in the opening of the housing, the working tool in the housing can be held without using the outer region of the housing.

The work implement introducing method of the present invention is:
The holder is an inner lid that rotates in the opening to engage the inner surface of the opening.
According to this feature, it is possible to engage with the inner surface of the opening simply by rotating the inner lid, which is a holder, so that the engaging operation is easy.

The fixture used in the working tool introduction method of the present invention,
A work tool for carrying out a predetermined work in the housing using a housing attached in a sealed manner to the fluid pipe and a case body provided with a flange communicating with the opening of the housing. It is a fixture used in the case of the working tool introduction method to be introduced into the housing via,
A flange portion projecting outward from the opening portion of the housing and connected to the flange of the case body; and a locking portion detachably engaging with an outer surface of the opening portion of the housing. It is characterized in that it is detachably interposed between the opening and the case body.
According to this feature, after the introduction of the work tool for performing a predetermined work in the housing is completed, the locking portion of the fixture having the flange portion with the case body protruding from the opening of the housing is provided. By removing from the opening of the body, it is possible not only to provide a casing with a small-sized opening that suppresses outward protrusion without providing a flange with the case body in the opening itself. The removed fixture can be reused in another work tool introduction method.

(A) is sectional drawing which shows the fluid pipe | tube, a housing | casing, and a fixture in Example 1, (b) is AA sectional drawing of (a). It is sectional drawing which shows the state which installed the case body via the fixture in the housing | casing. It is sectional drawing which shows the state which introduced the plug with the introduction apparatus and temporarily installed the plug. (A) is sectional drawing which shows the state which introduce | transduces an inner lid in the state which installed the plug temporarily, (b) is a top view similarly. (A) is sectional drawing which shows the method of installing an inner lid in a housing | casing, (b) is a top view similarly. It is sectional drawing which shows the state which seals the penetration screw hole of an opening part. It is sectional drawing which shows the state which obstruct | occludes an opening part. (A) is sectional drawing which shows the fluid pipe | tube, a housing | casing, and a fixture in Example 2, (b) is CC end elevation of (a), (c) is (a). It is DD end elevational view.

  EMBODIMENT OF THE INVENTION The form for implementing the working tool introduction method which concerns on this invention, and the fixture used in that case is demonstrated below based on an Example.

  The working tool introduction method according to the first embodiment and the fixture 4 used at that time will be described with reference to FIGS. As shown in FIG. 1, the fluid pipe 1 is, for example, a fluid pipe 1 made of cast steel for gas buried in the ground, and the fluid pipe 1 is formed by a housing 2 having a two-part structure. The predetermined place is surrounded. The fluid pipe according to the present invention may be made of ductile cast iron, other cast iron, steel, vinyl chloride, polyethylene, polyolefin, or the like, and the fluid pipe is surrounded by a casing having a multi-part structure of three or more parts. It doesn't matter. Furthermore, in the present embodiment, the fluid in the fluid pipe is a gas, but the fluid flowing in the fluid pipe is not necessarily a gas. For example, in addition to water, industrial water, sewage, etc., gas-liquid of gas and liquid It may be a mixture.

  As shown in FIG. 1A, the housing 2 includes a main body 2c surrounding the fluid pipe 1, and an extending portion 2b having an opening 2a extending upward from the main body 2c and opening at the upper end. , And is attached to the outer surface of the fluid pipe 1 in a sealed manner by welding. A convex portion 25 projecting toward the fluid pipe 1 is formed on the inner surface of the main body portion 2c. In addition, the outer peripheral surface of the extending portion 2b has an annular concave shape with a diameter smaller than that of the opening 2a, and the opening 2a side of the outer peripheral surface of the extending portion 2b is inclined toward the opening 2a. A tapered surface 2d is formed. Furthermore, the notch part 21 notched over the perimeter is formed in the outer periphery of the opening part 2a. The opening 2a has through-screw holes 22 communicating between the outer side and the inner side, which are provided at four positions spaced apart at intervals of about 90 degrees in the circumferential direction. A screw plug 23 that temporarily seals each through screw hole 22 is screwed into 22. The casing may be attached to the fluid pipe in a sealed manner. For example, the casing may be attached to the fluid pipe with a separate push ring. Further, the through screw holes are not limited to being drilled at four locations, and a predetermined number may be drilled.

  First, the annular fixture 4 is attached to the opening 2a of the housing 2 in a sealed manner. The fixture 4 has a mounting portion 4a that projects in the outer diameter direction from the outer peripheral surface of the opening 2a, and a locking portion 4b that is fixed to the mounting portion 4a, which will be described later. A plurality of connection holes 42 penetrating in the axial direction of the fixture 4 are formed in the attachment portion 4a at predetermined intervals along the circumferential direction. The mounting portion 4a includes an annular protrusion 4e that protrudes from the lower surface on the inner diameter side so as to fit into the cutout portion 21. Further, a groove 16 opening downward is formed in the lower portion of the annular protrusion 4e in the circumferential direction, and an annular seal member 6 having elasticity is accommodated in the groove 16. Accordingly, by mounting and assembling the mounting portion 4a on the notch portion 21, the annular protrusion 4e abuts on the inner surface of the notch portion 21 to restrict the movement of the mounting portion 4a, and the seal The member 6 seals the housing 2 and the fixture 4 in a sealing manner. A groove 17 that opens upward is formed in the upper surface of the attachment portion 4 a in the circumferential direction, and the annular seal member 7 is accommodated in the groove 17.

  As shown in FIGS. 1A and 1B, the locking portion 4 b of the fixture 4 is detachably locked to the outer peripheral surface of the extending portion 2 b having a concave shape. A locking portion 4b is further provided. The locking portions 4b are provided at four locations in the circumferential direction so as not to close the connection holes 42 at the lower portion of the mounting portion 4a, and are adjacent through screw holes in the circumferential direction of the opening 2a. It is arranged at a place where 22 is avoided. Further, the locking portion 4b extends below the tapered surface 2d of the extending portion 2b, and a bolt hole 4c is drilled from the outside toward the tapered surface 2d and in the radial direction of the annular fixture 4. Has been. A fixing bolt 4d having substantially the same inclination as the tapered surface 2d is screwed into the bolt hole 4c. Therefore, after the mounting portion 4a is placed on the notch portion 21, the fixing bolt 4d is screwed into the bolt hole 4c, whereby the tapered surface 2d and the tip of the fixing bolt 4d are firmly locked. It should be noted that the fixing bolt is not limited to be engaged with the taper surface of the extending portion, and for example, a claw as a locking portion may be locked to the outer surface of the opening, and can be locked and unlocked. If it is okay.

  In this way, by fixing the fixing bolt 4d of the fixture 4 to the tapered surface 2d, which is the outer surface of the extending portion 2b, this region can be cut later without using the inner region of the opening 2a. 9 can be secured, and the attachment 4 can be easily attached to and detached from the outer surface of the housing 2. Further, by removing the fixture 4 from the opening 2a of the housing 2, the opening 2a is reduced in size by suppressing outward protrusion without providing a flange with the case body 3 in the opening 2a itself. In addition, the removed attachment 4 can be reused when another work tool is introduced.

  Next, as shown in FIG. 2, the case body 3 communicating with the opening 2 a of the housing 2 is attached to the attachment portion 4 a of the attachment 4 in a sealed manner. The case body 3 includes a flange 3 a at the lower end and a flange 3 b at the upper end, and further includes a work valve 14 that can close the inside of the housing 2. A flange screw hole 32 is formed in the flange 3 a at a position corresponding to the connection hole 42. After the case body 3 is placed on the mounting portion 4a of the mounting tool 4, the connection bolt 15 is inserted from the connection hole 42 toward the flange screw hole 32 and tightened. Are connected in a sealed manner by a seal member 7 interposed between the mounting portion 4a and the flange 3a.

  A shaft member to which a work tool for performing a predetermined work such as a work of cutting / piercing the fluid pipe 1 or a work of installing a fluid control in the housing 2 can be attached to the flange 3b at the upper end of the case body 3 at the tip. 8, a support member 11 that supports the shaft member 8, and a drive means for the shaft member 8 (not shown) are installed in a sealed manner (see the upper part of FIG. 3). Although not shown here, a cutter as a working tool is attached to the tip of the shaft member 8, and the shaft member 8 is moved forward by the driving means toward the fluid pipe 1. As a result, the shaft member 8 and the cutter are moved forward through the case body 3 and the fixture 4, and the fluid pipe 1 is eventually cut. After that, the shaft member 8 and the cutter are pulled back together with the section of the fluid pipe 1 by the driving means, and the inside of the housing 2 is temporarily closed by the work valve 14, thereby cutting the fluid pipe 1 in an uninterrupted flow state. Is completed.

  Next, as shown in FIG. 3, the cutter connected to the tip of the shaft member 8 is replaced with a plug 9 as a working tool of the present invention that blocks the fluid in the fluid pipe 1. After the inside of the housing 2 is opened by the work valve 14, the shaft member 8 and the plug 9 connected to the tip of the shaft member 8 are directed toward the cut portion of the fluid pipe 1 in the housing 2 through the case body 3 and the fixture 4. Introduce. Note that, as in the present embodiment, not only the cutter connected to the tip of the shaft member 8 is replaced with the plug 9 or the like, but, for example, the cutter or the like connected to the shaft member 8 is different for each shaft member. You may make it replace with a work tool.

  The plug 9 has an annular sealing member 9a that abuts in the circumferential direction between the inner peripheral surface of the extending portion 2b and the plug 9 when the plug 9 is introduced and installed in the housing 2, and is continuous with the sealing member 9a. In addition, a sealing member 9 b that abuts between the upper surface of the convex portion 25 and the inner surface of the housing 2 and the plug 9 is provided. The sealing member 9a can prevent the fluid in the casing 2 from leaking out of the casing 2, and the sealing member 9b blocks the flow path between the left and right fluid pipes 1 in FIG. can do. Further, the plug 9 has a tapered shape in which a peripheral edge portion 9c on the upper surface of the plug 9 is inclined downward.

  With the plugs 9 introduced and installed in this manner, the screw plugs 23 are removed from the through screw holes 22 and temporarily fixed to the through screw holes 22 with the same tapered shape as that of the peripheral edge portion 9c. Bolt 10 is attached. As a result, the tip of the temporary fixing bolt 10 can be engaged with the peripheral edge portion 9c of the plug 9, and can counter the pressure of the fluid in the fluid pipe 1 loaded on the plug 9 installed in the housing 2. The state where the plug 9 is introduced into the housing 2 is maintained.

  Although not particularly illustrated, the shaft member 8 is removed from the plug 9, the introduction device 5 is removed from the case body 3, and the case body 3 is removed from the fixture 4. At this time, the fluid in the housing 2 is prevented from leaking out of the housing 2 by the sealing member 9 a, and the tip of the temporary fixing bolt 10 is engaged with the peripheral edge portion 9 c of the plug 9. The state where the housing 2 is sealed is maintained.

  FIG. 4A shows a state after the introduction device 5 and the case body 3 are removed. After the plug 9 is temporarily installed in the housing 2 by the temporary fixing bolt 10, the inner lid 12 which is a holder in the present invention for holding the plug 9 in the housing 2 is installed in the opening 2 a of the housing 2. . Thus, by providing the inner lid 12 installed in the housing 2 in the opening 2 a of the housing 2, the plug 9 in the housing 2 can be held without using the outer region of the housing 2. .

  More specifically, as shown in FIGS. 1A and 2, the inner lid 12 is fitted to the inner surface of the opening 2 a of the housing 2 at a position avoiding the through screw hole 22 in the circumferential direction. A fitting groove portion 24 is formed. The fitting groove portion 24 includes an annular groove 24a provided over the entire circumference at a height position corresponding to the through screw hole 22, and an opening from the annular groove 24a. 4a and 24b, each extending vertically to the upper end of 2a. In addition, the introduction groove may be, for example, 3 or less, or 5 or more.

  As shown in FIG. 4B, the inner lid 12 has a base 12a having an outer diameter enclosed in the opening 2a and provided with four screw hole portions 12c penetrating in the axial direction, and the base 12a. And four fitting portions 12b projecting from the first to the respective introduction grooves 24b. Each screw hole portion 12c of the base 12a is screwed with a pressing screw 12e that presses the plug 9 downward, and protrudes upward at a substantially central portion in plan view of the base 12a. A protrusion 12d is provided. The fitting portion 12b has a tapered shape which is not particularly shown but is inclined toward the axial direction of the opening 2a. The fitting portion 12b is formed in the annular groove 24a via the introduction groove 24b of the opening 2a. It comes to fit in.

  The fitting of the fitting groove 24 and the inner lid 12 thus configured will be described. First, as shown in FIGS. 4A and 4B, each of the fitting grooves 24 from the upper end of the opening 2a. Each fitting portion 12b of the inner lid 12 is inserted along the introduction groove 24b. When each fitting portion 12b is inserted into each introduction groove 24b and the inner lid 12 is pushed toward the plug 9, the inner lid 12 moves to the annular groove 24a.

  Next, as shown in FIG. 5B, the inner lid 12 is rotated in the horizontal direction by a predetermined angle in the annular groove 24a. Thereby, each fitting part 12b comes to be arrange | positioned in the predetermined position different from the introduction groove 24b in the circumferential direction, and each fitting part 12b comes to latch in this annular groove 24a (FIG. 5 (a)). reference). Furthermore, since each fitting part 12b is tapered as described above, the upper surface of each fitting part 12b is formed by the annular groove 24a and each introduction groove 24b as the inner lid 12 rotates. It comes to slide in the corner. Thereby, the inner lid 12 is gradually pressed downward by the corner portion. Thus, since the inner lid 12 can be engaged with the annular groove 24a on the inner surface of the opening 2a only by rotating, not only is the engagement operation easy, but the inner lid 12 is gradually pressed downward. By utilizing this, the plug 9 can be positively pressed and held against the housing 2.

  Then, with each fitting portion 12b locked in the annular groove 24a, each pressing screw 12e is screwed into the screw hole portion 12c of the base 12a toward the plug 9. As a result, the plug 9 is pressed by each pressing screw 12e using the support force by the annular groove 24a that locks the fitting portion 12b, and the sealing performance in the housing 2 is increased, and the reaction force of the plug 9 is increased. As a result, the inner lid 12 is pushed up above the opening 2a, and each fitting portion 12b is more firmly locked in the annular groove 24a. Furthermore, the inclination, displacement, etc. of the plug 9 can be adjusted by screwing the pressing screws 12e into the screw holes 12c provided in the circumferential direction of the base 12a.

  Next, as shown in FIG. 6, the fixture 4 is removed from the opening 2 a of the housing 2. Thereafter, each temporary fixing bolt 10 is removed from the through screw hole 22. At this time, since the plug 9 is firmly installed by the inner lid 12 as described above, the plug 9 is not detached from the housing 2 even if the temporary fixing bolt 10 is removed, and the sealed state is maintained. Then, each screw plug 23 is screwed again into each through screw hole 22. This prevents foreign matter from entering the housing 2 from the outside via the through screw hole 22.

  Thereafter, as shown in FIG. 7, an upper lid 13 that closes the opening 2 a is installed at the upper end of the opening 2 a of the housing 2. The upper lid 13 is formed with a protrusion 13b having a recess 13a that fits with the protrusion 12d of the inner lid 12 at a substantially central portion in plan view. When the upper lid 13 is installed at the upper end of the opening 2a, positioning is performed by fitting the concave portion 13a of the projection 13b with the projection 12d of the inner lid 12, and then the upper end of the opening 2a and the upper lid 13 are positioned. Welding the part where and contact, the installation of the plug 9 is completed.

  As described above, the working tool introduction method according to the present invention includes the housing 2 that is hermetically attached to the fluid pipe 1, the case body 3 that includes the flange that communicates with the opening of the housing 2, and the housing. And a fitting 4 having at least a fitting portion 4a connected to the flange 3a of the case body 3 and projecting outward from the opening 2a of the two. A working tool introduction method for introducing the plug 9 into the housing 2 via the case body 3 and the mounting tool 4, and the mounting tool 4 can be removed between the opening 2 a of the housing 2 and the case body 3. The plug 9 is introduced into the housing 2 via the case body 3 and the attachment 4, and the case body 3 and the attachment 4 are removed from the opening 2 a of the housing 2. Thus, after the introduction of the plug 9 that shuts off the fluid in the fluid pipe 1 in the housing 2, the mounting provided with the mounting portion 4 a with the case body 3 protruding from the opening 2 a of the housing 2. By removing the tool 4 from the opening 2a of the housing 2, the opening 2a itself is provided with a small-sized opening 2a that suppresses outward protrusion without providing an attachment 4a with the case body 3. The housing 2 can be provided.

  Further, when the fixture 4 used in the working tool introduction method of the present invention is connected to the flange 3a of the case body 3 so as to extend outward from the opening 2a of the casing 2, the mounting portion 4a and the casing 2 is a fixture 4 that includes a locking portion 4b that is detachably locked to the outer surface of the opening 2a, and is detachably interposed between the opening 2a of the housing 2 and the case body 3. After the introduction of the plug 9 that shuts off the fluid in the fluid pipe 1 in the housing 2, the attachment 4 having the attachment portion 4 a with the case body 3 protruding from the opening 2 a of the housing 2 is engaged. By removing the stop 4b from the opening 2a of the housing 2, the opening 2a can be reduced in size by suppressing outward protrusion without providing the opening 2a itself with the mounting portion 4a with the case body 3. Not only can the housing 2 provided be provided, but the removed fixture 4 can be reused for another work tool introduction method. It can be.

  Next, the working tool introduction method according to the second embodiment and the fixture 40 used at that time will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

  The case 20 in the present embodiment will be described with reference to FIG. 8. An annular groove 26 is formed on the entire outer surface of the opening 20 a that opens at the upper end of the extending portion 2 b. The upper end of the opening 20a, which is above the concave groove 26, is a portion 27 to be installed on which a fixture 40 of this embodiment described later is installed. Similarly to the above-described embodiment, a fitting groove 24 is formed on the inner surface of the opening 20a.

  The attachment 40 will be described. The attachment 40 is substantially the same as the outer diameter of the attachment portion 40a and the annular attachment portion 40a that is the flange portion of the present invention projecting in the outer diameter direction from the outer peripheral surface of the opening 20a. It is comprised from the latching | locking part 40b of the 2 division structure which has an outer diameter. As shown in FIG. 8B, a connecting screw hole 44 that communicates in the axial direction is formed in the mounting portion 40a along the circumferential direction at predetermined intervals, and a connection hole 42a that also communicates in the axial direction. Are drilled between adjacent connecting screw holes 44. Further, an installation portion 28 is formed on the lower surface on the inner diameter side of the mounting portion 40a and is cut out to be slightly larger than the outer diameter of the upper end of the opening 2a. The installation portion 28 includes an upper end of the opening 2a. An annular groove 18 that opens vertically toward the surface is provided, and the seal member 6 is accommodated in the groove 18. Furthermore, an annular groove 19 that opens upward is provided on the upper surface on the inner diameter side of the mounting portion 40 a, and the seal member 7 is accommodated in the groove 19.

  Further, as shown in FIG. 8 (c), the locking portion 40b has an annular shape by connecting semicircular split members 40c, 40c, and both ends of the split members 40c, 40c are respectively A connecting portion 40d is provided. On the lower surface on the inner diameter side of the split members 40c, 40c, there are projecting pieces 29, 29 projecting toward the concave groove 26 of the opening 20a. Further, the engaging portion 40b has a connection hole 45 formed at a position corresponding to the connection screw hole 44 of the attachment portion 40a, and a connection hole 42b formed at a position corresponding to the connection hole 42a of the attachment portion 40a. Yes. These connection holes 42 a and 42 b correspond to the flange screw holes 32 in the flange 3 a of the case body 3.

  First, the protruding pieces 29 and 29 of the split members 40c and 40c are fitted into the concave groove 26 of the opening 20a, the respective connecting portions 40d of the split members 40c and 40c are aligned, and the bolts and nuts 30 are inserted. The annular locking portion 40b is formed by tightening. Thus, after installing the latching | locking part 40b with respect to the concave groove 26, the installation part 28 of the attachment part 40a is mounted with respect to the to-be-installed part 27 of the opening part 20a. Thereby, the seal member 6 is elastically deformed by the gap between the installation portion 28 and the installation portion 27 and seals in a sealed manner.

  Then, the connecting screw hole 44 of the mounting portion 40a and the connecting hole 45 of the locking portion 40b are aligned, and the connecting bolt 46 inserted across the mounting portion 4a and the locking portion 40b is connected to each connecting screw hole 44. Then, the coupling hole 45 is inserted and tightened. Accordingly, the installation portion 27 is tightly pressed between the installation portion 28 and the projecting pieces 29, 29, whereby the fixture 40 is firmly installed on the housing 20.

  Next, although not particularly shown, the case body 3 and the introducing device 5 are installed on the attachment portion 4a of the attachment 40, and the fluid pipe 1 is cut and directed to the cut portion of the fluid pipe 1 as in the above embodiment. Plug 9 is introduced. Thereafter, the inner lid 12 is installed in the fitting groove 24, the upper end of the opening 2a and the upper lid 13 are welded, and the installation of the plug 9 is completed.

  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, in the above-described embodiment, the cutter and the plug 9 are applied as the work tools, but a strainer or the like that discharges impurities in the fluid pipe may be applied, and a butterfly valve, a switching valve, an emergency shut-off valve, etc. Various valves may be used and can be applied to a wide variety of modes.

  In the above embodiment, the holder of the present invention is used as the inner lid. However, the present invention is not limited to this. For example, after temporarily installing the working tool in the housing, a spacer or an elastic member is provided in the gap between the upper lid and the working tool. You may make it install an upper cover by interposing.

  Moreover, although the said Example demonstrated the procedure which installs a holder after removing an introducing device and a case body from a housing | casing, not only this but the introducing device and the case body were installed in the housing | casing. The holder may be installed as it is, or the holder may be installed after the introduction device, the case body, and the fixture are removed from the housing.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Housing | casing 2a Opening part 2b Extension part 2c Main-body part 2d Tapered surface 3 Case body 3a Flange 4 Attachment 4a Attachment part (flange part)
4b Locking part 5 Introduction device 8 Shaft member 9 Plug (work tool)
12 Inner lid (holder)
12a Base 12b Fitting part 24 Fitting groove part 27 Installation part 28 Installation part 29 Projection piece 40 Mounting tool 40a Attachment part (flange part)
40b Locking part 40c Split member

Claims (5)

A housing that is hermetically attached to the fluid pipe, a case body that includes a flange that communicates with an opening of the housing, and that projects outward from the opening of the housing and is connected to the flange of the case body. And a work tool introduction method for introducing a work tool for performing a predetermined work in the housing into the housing through the case body and the attachment tool. And
The mounting tool is detachably interposed between the opening of the housing and the case body,
Introducing the working tool into the housing through the case body and the fixture;
A work tool introduction method, wherein the case body and the mounting tool are removed from an opening of the housing.   The work tool introduction method according to claim 1, wherein the fixture further includes a locking portion that is detachably locked to an outer surface of the opening of the housing. Introducing the working tool into the housing through the case body and the fixture;
The work tool introduction method according to claim 1, wherein the work tool is installed in the housing, and a holding tool for holding the work tool in the housing is provided in an opening of the housing. .   The work implement introducing method according to claim 1, wherein the holding tool is an inner lid that engages with an inner surface of the opening by rotating in the opening. A work tool for carrying out a predetermined work in the housing using a housing attached in a sealed manner to the fluid pipe and a case body provided with a flange communicating with the opening of the housing. It is a fixture used in the case of the working tool introduction method to be introduced into the housing via,
A flange portion projecting outward from the opening portion of the housing and connected to the flange of the case body; and a locking portion detachably engaging with an outer surface of the opening portion of the housing. A fixture that is detachably interposed between the opening of the case and the case body.

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