JP2016223528A - Installation body fitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation body fitting method capable of easily releasing a temporarily fixed state of an installation body.SOLUTION: An installation body fitting method for fitting an installation body 5 in an uninterrupted flow state into a housing 4 externally fitted into a fluid pipe in a hermetically sealed manner, includes: an installation step of installing the installation body 5 into the housing 4; a temporarily fixing step of temporarily fixing the installation body 5 to the housing 4 by temporarily fixing means 52, 56; a pressing step of pressing the installation body 5 against fluid pressure by pressing means 20; a temporarily fixing release step of releasing the temporarily fixed state from the temporarily fixing means 52, 56 while keeping the pressed state from the pressing means 20; and a pressing release step of releasing the pressed state, and thereby making final fixing means of finally fixing the installation body 5 to the housing 4 function.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an installation body mounting method for mounting an installation body in a non-continuous flow state in a casing that is externally fitted and attached to a fluid pipe.

  In general, when various installation bodies such as a shutoff valve and a switching valve device are attached to an existing fluid pipe such as a water supply or a gas pipe in an uninterrupted state, the fluid pipe is enclosed in a casing and sealed in the casing. After cutting, the construction method to install various new installation bodies is adopted. There is also a construction method in which various installed bodies such as a shut-off valve and a switching valve device are removed from a casing that is already installed in the fluid pipe, and then the newly installed various installed bodies are attached in an uninterrupted state.

  When an existing fluid pipe is enclosed in a casing in a sealed manner and the fluid pipe is cut in the casing, for example, as a conventional method, for example, an existing fluid pipe is externally fitted in a sealed manner by the casing and is attached to the casing. In the case, the fluid pipe is cut in an uninterrupted flow state, and the installation body is attached by the installation body attachment device while maintaining the sealed state using the work valve of the work case. Thereafter, a process of temporarily fixing the installation body after temporarily fixing the installation body with a temporary fixing means provided in the housing and removing the installation body mounting device is employed (see Patent Document 1).

In this way, when installing the installation body while maintaining an uninterrupted flow state, the installation body is always subjected to fluid pressure, so it is necessary to fix the position in the installed state, while installing in the work case In a state where the body attachment device is mounted on the installation body, it is difficult to secure a location for fixing the installation body, and a direction (for example, horizontal direction) different from the installation direction (for example, vertical direction) of the installation body in the work case. The installation body is temporarily fixed once by the temporary fixing means inserted from above, and the main fixing is performed after removing the mounting device located above the installation body.
In such a construction method of Patent Document 1, since the casing itself surrounding the fluid pipe in a hermetically sealed manner is integrally provided with the temporary fixing means, the temporary fixing means is in the use state after the installation body is installed. It is in a state of being left as a part of the body, and there is a risk of leakage due to aging.

  Moreover, as a construction method made in view of the above problem, after the installation body is attached in an uninterrupted state as in Patent Document 1, provisional fixing provided in an interposed member attached between the housing and the work valve device After the installation body is temporarily fixed to the housing by the advancing and retreating member that can be moved back and forth in the horizontal direction, which is a part of the means, and the installation body mounting device is removed, it is formed at the opening of the housing as the main fixing by the main fixing means. A construction method has been adopted in which a construction member constructed between the groove portion and the installation body is inserted, and then the temporarily fixed state is released and removed. (See Patent Document 2).

Japanese Patent Publication No. 60-35594 (4th page, FIG. 1) JP 2001-164607 A (6th page, FIG. 1)

  However, in the method of Patent Document 2, the temporary fixing means is still receiving the force from the installation body that has received the fluid pressure even after the main fixing means has been permanently fixed. When the advancement / retraction member, which is a part of the temporary fixing means, tries to retreat, the frictional force generated on the advancement / retraction member and the installation body prevents the advancement / retraction member from retreating, so that the installation body can be easily released from the temporarily fixed state. There was a problem that could not be.

  This invention is made paying attention to such a problem, and it aims at providing the installation body attachment method which can cancel | release the temporarily fixed state of an installation body easily.

In order to solve the above problems, the installation body mounting method of the present invention is:
An installation body mounting method for mounting an installation body in an uninterrupted flow state in a casing that is externally fitted and attached to a fluid pipe,
An installation step of installing the installation body in the housing;
A temporary fixing step of temporarily fixing the installation body to the housing by temporary fixing means;
A pressing step of pressing the installation body against a fluid pressure by a pressing means;
A temporary fixing releasing step of releasing the temporarily fixed state by the temporary fixing means while being pressed by the pressing means;
And a pressing release step for causing the main fixing means for permanently fixing the installation body to the casing to function by releasing the pressing state.
According to this feature, the pressing means resists the fluid pressure when releasing the temporarily fixed state of the installation body that is attached to the fluid pipe in a sealed manner and is attached in a continuous flow state. Therefore, the force that the temporary fixing means receives from the installation body can be reduced, and the temporarily fixed state can be easily released.

The installation body attaching method according to the present invention is such that the installation step is performed in a state in which a working case is attached to the housing via an interposed member, and the pressing step is performed by removing the working case from the interposed member. After the detachment, the pressing means is attached to the interposed member.
According to this feature, by attaching the pressing means to the interposed member in the pressing process, the pressing process can be quickly performed using the interposed member already attached to the housing.

The installation body attachment method of this invention is characterized by the said press means being attached to the outer peripheral part of opening of the said interposed member.
According to this feature, the pressing means is attached to the outer peripheral portion of the opening of the interposed member, so that a wide pressing area can be secured inside the opening.

The installation body mounting method of the present invention is
The pressing means presses the installation body at a plurality of locations.
According to this feature, since the installation means can be pressed in a balanced manner by the pressing means pressing the installation body at a plurality of locations, the posture of the installation body can be stabilized and the sealing performance can be maintained.

The installation body mounting method of the present invention is
The main fixing means is arranged via an insertion portion provided in the pressing means.
According to this feature, the arrangement work of the fixing means can be performed with the pressing means attached.

It is a partial front sectional view showing a state where a fluid pipe cutting device is installed in a casing attached to an existing fluid pipe according to the first embodiment. It is a partial side sectional view of the arrow A in FIG. It is a partial front sectional view which shows the state which installed the valve main body in the housing | casing by the valve main body insertion apparatus. It is a partial side sectional view showing a state where a valve lid is temporarily fixed with a presser screw. It is a top view in the state where the press means was attached to the work valve body. It is a partial front sectional view at the time of insertion of the fixing member into the housing recess. It is a partial front sectional view in the position confirmation operation after insertion of the fixing member into the housing recess. It is a figure which shows the state which has cancel | released the temporary fixing means in BB sectional drawing of FIG. (A) is a top view of the state which removed the fixed flange main body and the work valve main body from the housing | casing, (b) is also a partial front sectional view. (A) is a top view of the state which installed the upper cover in the housing | casing, (b) is a partial front sectional view similarly. (A) is a plane enlarged view which shows the state before inserting a fixing member in a housing | casing recessed part, (b) is a plane enlarged view of the state after inserting similarly. It is a partial cross section figure of the insertion jig used when inserting a fixing member in a case crevice. (A) is a top view in the press process of the installation body attachment method which concerns on Example 2, (b) is CC sectional drawing of (a). (A) is a top view after the press release process of the installation body attachment method which concerns on Example 3, (b) is also a partial front sectional view.

  The installation body attaching method according to the first embodiment will be described with reference to FIGS. 1 to 12.

  As shown in FIGS. 1 and 2, in order to perform the installation body mounting method according to the present embodiment, the existing fluid pipe 2 as a fluid pipe, and the existing fluid pipe 2 are sealed on the outer circumferential surface of the existing fluid pipe 2. A housing 4 to be attached, a valve main body 5 as an installation body installed in the housing 4, and detachment prevention fittings 6 and 6 for preventing detachment of the existing fluid pipe 2 are used.

  Here, the existing fluid pipe 2 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 an epoxy resin layer. The fluid pipe according to the present invention may be made of metal such as cast iron or steel, or asbestos, 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. 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. Further, the material of the housing 4 and the valve body 5 may be adapted to the above.

  As shown in FIG. 3 and FIG. 4, the valve body 5 includes a valve lid 5a, a valve seat body 5b, a valve body 5v movable within the valve seat body 5b, and a valve operation connected to the upper portion of the valve body 5v. A valve box 5h is provided that houses a packing for sealing the shaft 5j and the valve operating shaft 5j. The valve seat body 5b and the housing 4 are sealed by a sealing member 5e. Then, by rotating the valve operating shaft 5j, the valve body 5v can be moved, and the flow of the existing fluid pipe 2 can be controlled by opening and closing the hole 5f provided in the valve seat body 5b.

  As shown in FIG. 1, the housing 4 is a so-called split T-shaped tube, and is divided into a housing upper portion 41 and a housing lower portion 42 in the radial direction (vertical direction in this embodiment) of the existing fluid tube 2. It has a structure.

  The housing upper portion 41 is formed with a neck portion 41a, a flange portion 41b that is continuous with the neck portion 41a, a housing opening portion 41d that is continuous with the flange portion 41b and communicates with the inside of the housing, and is further formed at the end of the housing opening portion 41d. A housing recess 41c for inserting and fixing a fixing member 7 described later is formed. A fluid pipe cutting device 70, a valve body insertion device 80 (see FIG. 3), and the like can be attached to the flange portion 41b via a fixed flange body 50 and a work valve body 60 described later.

  On the other hand, the housing lower part 42 has a bowl-shaped housing bottom 42d, and a discharge hole 42b is formed in the center of the housing bottom 42d. The discharge hole 42b can be connected to a valve 49. As will be described later, chips generated when the existing fluid pipe 2 is cut can be discharged together with the fluid from the discharge hole 42b by operating the valve 49. ing.

  In this embodiment, the case upper part 41 and the case lower part 42 will be described. However, the division direction of the case is not limited to the top and bottom, and may be, for example, a horizontal direction or a predetermined angle of inclination. The number of divisions may be 3 or more. Similarly, the piping direction of the existing fluid pipe 2 is not limited to the horizontal direction, and may be, for example, the vertical direction. Furthermore, the cutting direction of the cutter 72 described later is not limited to the vertical direction, and may be, for example, a horizontal direction.

  Further, as shown in FIG. 1, in a state where the housing 4 is sealed and attached to the existing fluid pipe 2, the flange portion 41b of the housing upper portion 41 is provided with a fixed flange body 50 which is an interposed member in the present invention. The working valve main body 60 and the fluid pipe cutting device 70 as the working case in the present invention are attached.

  As shown in FIG. 1 and FIG. 2, a seal member 53 is inserted on the joint surface between the fixed flange portion 51 and the flange portion 41b of the fixed flange main body 50, which is an interposed member in the present invention, and a bolt / nut. By being tightened by 54, the fixed flange portion 51 and the flange portion 41b are sealed. In the radial direction of the fixed flange portion 51, a plurality of press screws 52 are attached in a sealed manner with a predetermined interval in the circumferential direction. When the valve body 5 is inserted into the housing 4 as will be described later. The valve body 5 can be temporarily fixed. That is, the temporary fixing means of the present invention is constituted by the presser screw 52 and the female screw portion 56 of the fixing flange main body 50 to which the presser screw 52 is screwed.

  As shown in FIG. 1, a seal member 63 is inserted into a joint surface between the work valve body 61 of the work valve main body 60 that is an interposed member in the present invention and the fixed flange main body 50, and is fastened by a bolt 55. The work valve main body 60 and the fixed flange main body 50 are sealed. A work valve 62 that can be opened and closed between the housing 4 and the fluid pipe cutting device 70 by being slid horizontally is attached to the work valve housing 61 of the work valve main body 60 in a sealed manner.

  In addition, a sealing member 73 is inserted in a joint surface between the fluid pipe cutting device 70 and the work valve main body 60 and tightened by a bolt 74, and the fluid pipe cutting device 70 and the work valve main body 60 are sealed. The Further, a cutter 72 attached to the cutter shaft 75 is attached to the punching device casing 71 in a sealing manner so as to be movable up and down and rotatable. The cutter 72 and the cutter shaft 75 can be driven to rotate from the outside of the fluid pipe cutting device 70 by a driving device (not shown).

  Hereinafter, the cutting process of the existing fluid pipe 2 and the installation process of the installation body will be described.

  First, the cutting process will be described. As shown in FIG. 1, the existing fluid pipe 2 is cut in an uninterrupted flow state by the cutter 72 with the work valve 62 opened. Since the cutter 72 has a cylindrical shape, the pipe cutting portion of the existing fluid pipe 2 is formed in an arc shape along the cylindrical cutter 72 when viewed from the cutter shaft 75 direction. The chips generated when cutting the existing fluid pipe 2 are operated by operating a valve 49 attached to a discharge hole 42b provided in the center of the lower part 42 of the casing, and discharge the chips together with the fluid.

  After cutting the existing fluid pipe 2, the cutter 72 is raised, the work valve 62 of the work valve housing 61 is closed, and the space between the housing 4 and the fluid pipe cutting device 70 is sealed. Thereafter, the fluid in the fluid pipe cutting device 70 is discharged, the fluid pipe cutting device 70 is removed from the work valve main body 60, and the cutting process of the existing fluid pipe 2 is finished.

  Next, as shown in FIG. 3, a valve body insertion device 80, which is a working case in the present invention, is attached to the upper portion of the work valve body 60 in a sealed manner. The valve body insertion device 80 includes an insertion device housing 86, an insertion shaft 87, and a holding portion 83 that holds the valve body 5 attached to one end of the insertion shaft 87 by a mounting bolt 88. At the end, a screw portion 89 screwed into the insertion shaft 87 and a handle 90 for rotating the screw portion 89 are provided, and the insertion shaft 87 is moved up and down by rotating the handle 90 so that the valve body 5 Can be inserted into and removed from the housing 4.

The installation process is completed by rotating the handle 90 to lower the insertion shaft 87 and inserting and installing the valve body 5 in which the fixing members 7 and 7 are installed in the housing 4.
Next, the temporary fixing step will be described. As shown in FIG. 4, a presser screw 52 provided on the fixing flange main body 50 is screwed in, and the valve cover inclined surface 5 c formed on the outer peripheral portion of the valve cover 5 a of the valve main body 5 is temporarily fixed by the presser screw 52. Thereafter, the fluid in the valve body insertion device 80 is discharged, the insertion device lid 84 is removed, the mounting bolt 88 that connects the holding portion 83 and the insertion shaft 87 is removed from the working hole 85, and the valve body insertion device 80 is operated. After removing from the valve body 60, the holding portion 83 of the valve body insertion device 80 is removed from the valve body 5.

  Next, the pressing step will be described. After the valve main body insertion device 80 is removed from the work valve main body 60, as shown in FIGS. 5 and 6, the push-in flange 20 is attached to the work valve housing 61 so as to surround the valve main body 5. At this time, fixing members 7 are disposed in advance on the valve lid 5a. As will be described later, the fixing members 7 and 7 are inserted into the housing concave portion 41c, and are installed on the housing concave portion 41c of the housing 4 and the valve lid 5a of the valve main body 5, thereby The housing 4 has a function of being fixed to the housing 4, and the housing recess 41 c and the fixing member 7 constitute the fixing means in the present invention.

Here, as shown in FIG. 5, the push-in flange 20 is formed in an annular shape having a circular central port 20 d surrounding the upper projecting portion of the valve body 5 at the center thereof, and is arranged in a circular shape near the outer periphery. The plurality of fixing bolts 20b are fixed to the work valve housing 61.
Further, substantially rectangular work holes 20a, 20a provided for mounting the fixing member 7 by an insertion jig 30 described later are provided so as to sandwich the valve body 5 in the tube axis direction of the existing fluid pipe 2. The working holes 20a, 20a constitute an insertion portion in the present invention.
Furthermore, ribs 20c and 20c for reinforcing the push-in flange 20 are provided so as to sandwich the valve body 5 in a direction orthogonal to the tube axis.

  Next, as shown in FIG. 6, the push-in flange 20 has a portion where the thickness varies along the radial direction, and the inner periphery located at the opening of the work valve body 60 that does not contact the work valve housing 61. The portion has a thickness D1, and the outer peripheral portion in contact with the flange portion 41b has a thickness D2, and D1> D2. The portion where the thickness is increased is referred to as a step portion 20e. Due to this difference in thickness, the pushing flange 20 is fixed to the work valve housing 61 and the stepped portion 20e faces the existing fluid pipe 2 while being in surface contact with the overhanging portion 5p projecting to the upper side of the valve body 5. Thus, the valve body 5 can be pressed against the fluid pressure (see FIG. 8). That is, the pushing flange 20 constitutes the pressing means in the present invention, and the stepped portion 20e extending toward the installation body constitutes the pressing portion in the present invention.

  The thickness of the push-in flange 20 is not limited to the above aspect, and may be D1 ≦ D2 as long as the valve body 5 can be pressed with the push-in flange 20 attached to the work valve housing 61.

  Here, since the direction in which the pushing flange 20 is attached to the work valve housing 61 of the work valve body 60 and the direction in which the push body 20 is pressed are the same direction, the valve body 5 is not slid in contact with the valve body 5. Can be pressed. Further, the push flange 20 is mounted (vertically downward in this embodiment) opposite to the direction of the fluid pressure received by the valve body 5 (vertically upward in this embodiment). The valve body 5 can be pressed in the mounting direction. Moreover, the valve body 5 can be pressed from the opening of the work valve main body 60 by attaching the push flange 20 as a pressing means to the work valve main body 60 as an interposed member, and is already attached to the housing 4. The pressing operation can be performed quickly using the interposed member.

  Next, as a main fixing preparation step, as shown in FIG. 6, fixing members 7 and 7 having a substantially rectangular shape in plan view are inserted into a case recess 41 c formed in a case upper part 41 described later. Thus, the fixing member 7 can hold the fluid pressure applied to the valve lid 5a by inserting the fixing member 7 so as to straddle the valve lid 5a and the housing recess 41c. At this time, the working valve housing 61 has a small working space inside the working valve housing due to the presence of the valve box 5h and the like, and the push-in flange 20 is attached to the working valve housing 61. The insertion work is difficult. Therefore, the insertion jig 30 can be inserted between the valve lid 5a and the fixing member 7 through the working hole 20a of the pushing flange 20 so that the fixing member 7 can be inserted into the housing recess 41c. . As shown in FIG. 11, the fixing member 7 is provided with a tapered portion 7d. Furthermore, the fixing member 7 is provided with a plurality of holes 7e, 7e. By inserting the insertion jig 30 into the holes 7e and 7e, not only can the fixing member 7 be inserted into the housing recess 41c even when the working space is narrow, but the fixing member 7 can be easily removed from the housing recess 41c. Can do.

  Next, as shown in FIG. 7, in order to confirm that the fixing members 7 and 7 are sufficiently inserted into the housing recess 41 c, the above-described insertion jig 30 is removed once and in a state in which the fixing member 7 is inverted. It is confirmed that the fixing members 7 and 7 are inserted by inserting a confirmation gauge 31 provided in the thickness. By stepping on this confirmation work, it can be confirmed that the fixing members 7, 7 have been inserted, so that it is possible to avoid mounting defects of the fixing members and to attach them securely.

  Hereinafter, the present fixing means including the fixing members 7 will be described in detail. Since the fixing member 7 needs to maintain a large fluid pressure acting on the valve lid 5a for a long period of time, the fixing member 7 is formed to be wide and substantially rectangular in a plan view to reduce the pressure received by the fixing member 7. desirable. However, if the fixing member 7 is not properly inserted into a predetermined position of the housing recess 41c, only one fixing member 7 out of a plurality of fixing members or a contact between the local portions of the fixing member 7 and the valve lid 5a. Large pressure acts, leading to long-term reliability degradation. Therefore, the present invention provides guiding means for guiding the fixing member in the advancing and retreating direction so that the fixing member 7 is fixed to the predetermined portion of the housing recess 41c even if the work space for inserting the fixing member 7 into the housing recess 41c is narrow. It was made possible to insert it appropriately and easily in position.

  As shown in FIG. 11, the valve lid 5a is formed with a valve lid groove 5k as guiding means. The valve lid groove portion 5k has valve lid groove side wall portions 5m and 5m and a valve lid groove inner wall portion 5n, and the radially outer side of the valve lid 5a is opened. As shown in FIG. 11A, when the fixing member 7 is brought close to the valve lid groove inner wall portion 5n of the valve lid groove portion 5k, the arcuate wall surface 7b of the fixing member 7 protrudes from the outer peripheral portion of the valve lid 5a. Therefore, the valve body 5 can be easily inserted into the housing 4. Further, the fixing member 7 can be freely moved along the valve lid groove side wall portion 5m while being inserted into the valve lid groove portion 5k. The fixing member 7 and the valve lid groove 5k are adjusted so as to contact each other.

  On the other hand, in a state where the valve body 5 is attached to the housing 4, a housing concave portion 41 c is provided in the inner peripheral portion of the housing upper portion 41 facing the valve lid groove portion 5 k. The housing recess 41c is open on the inside in the radial direction, and the opened surface faces the valve lid groove 5k. The width and height of the housing recess 41 c are formed to be substantially the same as or slightly larger than the width and height of the fixing member 7 so that the fixing member 7 can be accommodated. Further, the fixing member 7 and the housing recess 41c are also adjusted so as to contact each other.

  With this configuration, even if there is a work space for inserting the fixing member 7 into the housing recess 41c, the fixing member 7 inserted into the valve lid groove portion 5k extends along the valve lid groove side wall portion 5m. Be guided. Accordingly, as shown in FIG. 11B, if the fixing member 7 is moved in the valve lid groove 5k, the fixing member 7 is guided to the housing recess 41c, and the fixing member 7 is guided to the valve lid 5a and the housing recess. It can be easily attached so as to straddle 41c. Further, by attaching the fixing member 7 so as to straddle the valve lid 5a and the housing recess 41c, the side wall of the fixing member 7 that has moved in the valve lid groove 5k is engaged with the inner wall 41e of the housing recess 41c. Therefore, the movement of the valve body 5 in the circumferential direction can also be restricted. The valve lid groove 5k may be omitted by guiding the fixing member 7 through the long hole 7c of the fixing member 7 and the housing recess 41c.

  Here, a method for inserting the insertion jig 30 and the fixing member 7 using the same will be described.

As shown in FIG. 12, the insertion jig 30 is a long jig having a check gauge 31 and a flange 34 at both ends of the handle 33, and the left and right operation pins 32 are provided on the flange 34. Is fixed to the hole 34a. In addition to the portion where the operation pin 32 is fixed in FIG. 12, the hole 34 a is also provided on the left and right sides of the hole 34 a, and the position of the operation pin 32 is set according to the size of the fixing member used. It has a structure that can be changed.
Next, the insertion jig 30 is a jig to be used by changing the upper and lower sides depending on the work stage. When the fixing member 7 is inserted into the housing recess 41c, the flange 34 is fixed to the fixing member 7 side (main part). In the embodiment, it is arranged so as to be on the lower side, and thereafter, when the insertion state is confirmed, the confirmation gauge 31 is arranged so as to be positioned on the fixed member 7 side.
Specifically, as shown in FIGS. 6 and 11A, when the fixing member 7 is inserted into the housing recess 41c, the operation pins 32 are inserted into the holes 7e of the two fixing members 7, respectively. And the fixing member 7 is inserted in the housing | casing recessed part 41c by moving the handle | pattern part 33 of the insertion jig 30 to the radial direction outer side of the valve main body 5. FIG.
Next, as shown in FIGS. 7 and 11 (b), in order to confirm that the fixing member 7 has been sufficiently inserted into the housing recess 41c, the insertion jig 30 is once extracted from the inside of the housing, The insertion jig 30 is again arranged inside the housing so that the confirmation gauge 31 comes to the fixed member 7 side with the top and bottom reversed. Here, since the confirmation gauge 31 has a thickness corresponding to a gap formed between the inner wall portion 5n of the valve lid groove when the fixing member 7 is sufficiently inserted into the housing recess 41c, By inserting the confirmation gauge 31 between the valve lid groove inner wall 5n and the fixing member 7, it can be confirmed that the fixing member 7 has been sufficiently inserted into the housing recess 41c. At this time, the confirmation gauge 31 is inserted from the tapered portion 7d of the fixing member 7, so that even if the fixing member 7 is slightly inward in the radial direction of the valve body 5 and the insertion is insufficient, the confirmation gauge 31 is assisted. The fixing member 7 can be further easily inserted by using as a typical insertion means.

Subsequently, as shown in FIG. 7, the fixing members 7, 7 are locked by a plurality of bolts 7a, 7a. In addition, this fixed preparation process is performed after removing the valve main body insertion apparatus 80 which is a working case after a temporary fixing process, and is good also as a pressing process after that.
After the pressing step, as the temporary fixing releasing step, the temporary fixing state by the temporary fixing means is released by loosening the presser screw 52. (See FIG. 8).
Thereafter, as the pressing release step, the push-in flange 20, the fixed flange main body 50 and the work valve main body 60, which are interposed members, are removed (see FIG. 9). As described above, the fixing flange main body 50 can be removed, so that the fixing flange main body 50 and the plurality of presser screws 52 provided on the fixing flange main body 50 are left in the housing 4 so that the structure of the installation body does not deteriorate over time. Not only can it be simplified, but the fixed flange main body 50 and the plurality of presser screws 52 that have been removed can be attached to another housing and reused. As a result, the pressing state by the push-in flange 20 is released, so that the fluid pressure applied to the valve body 5 is received by the fixing member 7 and the housing recess 41c as the main fixing means, and the main fixing means functions.

  Here, when the presser screw 52 is removed, the presser flange 20 is pressed against the fluid pressure in advance, so that the fluid pressure applied to the presser screw 52 is reduced or no fluid pressure is applied. ing. In particular, since the step portion 20e and the overhang portion 5p are pressed against each other in surface contact, the valve body is pressed evenly without being biased. For this reason, when operating the presser screw 52, it is possible to prevent a problem that a large load is generated in the forward / backward movement of the screw due to the fluid pressure, and the removal work can be easily performed.

  Finally, as shown in FIG. 10, the upper lid 43 is attached to the flange portion 41b with bolts and nuts 43b, and the installation process of the installation body is completed. Further, an upper lid convex portion 43 a that holds the fixing member 7 is provided at a position where the upper lid 43 faces the fixing member 7. Since the fixing member 7 is also held by the upper lid convex portion 43a in a state where the upper lid 43 is fastened to the flange portion 41b by the bolt / nut 43b, the force received by the fixing member 7 can be reduced. The upper lid 43 is formed with an upper lid convex portion 43c so as to hold not only the fixing member 7 but also the valve lid 5a, but may be omitted.

  Next, an installation body mounting method according to Embodiment 2 of the present invention will be described with reference to FIG. Note that a description of the same components as those in the first embodiment is omitted.

  As shown in FIG. 13, the pressing flange 20 ′ used in the pressing step according to the second embodiment is an annular plate formed with substantially the same thickness, A pressing bolt 20′f is provided in the pressing portion that makes surface contact. When the valve body 5 is pressed using the push flange 20 ′, the push body 20′f is attached to the work valve body 60, and the push bolt 20′f is screwed so that the valve body 5 is fluidized. It can give the power to resist. By setting it as such a structure, it is not necessary to provide a level | step-difference part in a pushing flange, and manufacture of a pushing flange can be made easy.

  Next, an installation body mounting method according to Embodiment 3 of the present invention will be described with reference to FIG. Note that the description of the same components as those in the first and second embodiments is omitted.

  As FIG. 14 shows, the installation body installed in the installation body attachment method concerning Example 3 is the switching valve 15. FIG. The switching valve 15 includes a switching valve main body casing 15a, a valve body (not shown) that can rotate within the switching valve main body casing 15a, and a valve operating shaft 15s connected to the upper portion of the valve body. By rotating with a driving means (not shown), the valve body can be rotated within the switching valve main body casing 15a, and the flow direction of the existing fluid pipe 2 can be switched. Even in such a switching valve 15, since the pressing means presses the installation body against the fluid pressure by mounting by the installation body mounting method of the present invention, the temporary fixing means does not receive the force from the installation body, The temporarily fixed state can be easily released.

  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 description has been made including the cutting step of cutting the existing fluid pipe. However, the installation body mounting method of the present invention is not limited to this, and a case provided in advance in the existing fluid pipe is used. On the other hand, an installation body such as a valve device may be attached.

  Moreover, in the said Example, although the housing | casing recessed part 41c which inserts the fixing member 7 was made into the shape which can control the movement of the circumferential direction of the housing 4 and the valve main body 5 by having the inner wall 41e, it is not restricted to this. Alternatively, it may be configured as a circumferential groove. By using a circumferential groove that does not have the inner wall 41e, the insertion of the fixing member 7 becomes easier, and the working time can be shortened. Note that the housing recess of the present invention does not need to be a circumferential groove having a U-shaped cross section, and may be a groove having an inverted L-shaped cross section as long as the fixing member 7 can be held without being detached from the housing 4. Good.

  The installation body may be an installation body for installing a rust prevention ring, valves such as a sluice valve, a plug, a butterfly valve, or a pipe connection member. Furthermore, although the cylindrical cutter was used for the cutting, a wire saw or a bite may be used.

  Further, the pushing flange is not limited to an annular shape, and may be divided in the circumferential direction as long as it is attached to the work valve main body 60 and can press the installation body.

  Further, the working hole only needs to have an insertion portion for inserting the insertion jig 30 and may have a shape such as a partially opened notch.

  In the above embodiment, the female screw portion 56 and the presser screw 52 constituting the temporary fixing means are provided in the fixing flange main body 50 as an interposed member, and the pressing means 20 is attached to the fixing flange main body 50. The fixing means may be provided on the casing, and the pressing means may be attached to the top of the casing. In this case, the pressing release step can be omitted and the construction can be facilitated.

2 Existing fluid pipe (fluid pipe)
4 Housing 5 Valve body (installed body)
7 Fixing member (main fixing means)
20, 20 'pushing flange (pressing means)
20a Work hole (insertion part)
20e Step part (pressing part)
41c Housing recess (main fixing means)
52 Presser screw (Temporary fixing means)
56 Female thread (Temporary fixing means)
50 Fixed flange body (intermediate member)
60 Work valve body (intermediate member)
70 Fluid pipe cutting device (working case)
80 Valve body insertion device (working case)

Claims (5)

An installation body mounting method for mounting an installation body in an uninterrupted flow state in a casing that is externally fitted and attached to a fluid pipe,
An installation step of installing the installation body in the housing;
A temporary fixing step of temporarily fixing the installation body to the housing by temporary fixing means;
A pressing step of pressing the installation body against a fluid pressure by a pressing means;
A temporary fixing releasing step of releasing the temporarily fixed state by the temporary fixing means while being pressed by the pressing means;
An installation body mounting method comprising: a pressing release step for causing a main fixing means for permanently fixing the installation body to the housing by releasing the pressed state.   The installation step is performed in a state where a work case is attached to the housing via an interposed member, and the pressing step is performed after the work case is removed from the interposed member, The installation body mounting method according to claim 1, wherein the mounting body is mounted on the interposed member.   The installation body attachment method according to claim 2, wherein the pressing means is attached to an outer peripheral portion of the opening of the intervention member.   The said pressing means presses the said installation body in multiple places, The installation body attachment method of Claim 3 characterized by the above-mentioned.   5. The installation body mounting method according to claim 3, wherein the main fixing unit is disposed through an insertion portion provided in the pressing unit.

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