JP2023086891A - Pipe connection member removal device - Google Patents

Abstract

To provide a pipe connection member removal device capable of surely and easily sealing between a base member and a neck portion of a branch pipe portion.SOLUTION: In a pipe connection member removal device, a pipe connection member U1 mounted on a branch pipe portion 2 is surrounded in a sealed state by a work case 30 including a base member 9 of a divided structure fixed to a neck portion 2A of the branch pipe portion 2 integrally branched from a main pipe portion 1A of an existing flow channel constitution member 1 and a case member 21 assembled to the base member 9 in a sealed state, and the pipe connection member U1 is removed in the work case 30 under a non-cut flow state. A seal portion 11 for sealing the neck portion 2A of the branch pipe portion 2 is provided on the base member 9, and an annular seal ring 24 for sealing between the base member 9 and the case member 21 is disposed on an outer diameter side of the branch pipe portion 2 with respect to the seal portion 11.SELECTED DRAWING: Figure 9

Description

TECHNICAL FIELD The present invention relates to a removal device and a pipe connection member removing method for removing a pipe connection member connected to a flow path forming member in a non-interrupted state.

Conventionally, when removing a pipe connection member (e.g., valve body, manhole cover, etc.) connected via a flange to a branch pipe branching from a flow path component such as an existing water pipe, pipe connection Generally, a working case is hermetically attached so as to enclose the members, and the pipe connecting member is removed in the working case in a non-interrupted state.

The removal device used for the removal work of such pipe connection members consists of a work case consisting of a base member divided in two and having a larger diameter than the flange of the branch pipe portion of the existing pipe, and a cylindrical case assembled on the base member. After attaching the base member to the neck of the branch pipe, the case member is assembled on the base member to assemble the work case without interference with the flange of the branch pipe. (See Patent Document 1, for example).

Japanese Patent Application Laid-Open No. 6-249386 (page 3, FIG. 1)

However, in Patent Document 1, the packing is attached to the inner peripheral surface of the base member. Since it is a structure in which the base member is attached to the neck of the branch pipe in a sealed manner by crushing between the member and the neck of the branch pipe, high manufacturing accuracy and mounting accuracy are required for the base member and packing. It was difficult to visually recognize the situation, and the operation of reliably sealing the gap between the base member and the neck of the branch pipe was troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems. The purpose is to provide a method.

In order to solve the above problems, the pipe connection member removing device of the present invention includes:
Attached to the branch pipe by a working case comprising a divided structure base member fixed to the neck of the branch pipe branched from the main pipe of the flow path component, and a case member assembled to the base member. A pipe connection member removing device for hermetically enclosing a pipe connection member that has been removed and removing the pipe connection member in a work case in an uninterrupted state,
The base member is characterized in that a notch recess for a sealing member that is open to one axial direction side and an inner diameter side of the branch pipe portion is formed so as to surround the neck portion of the branch pipe portion. .
According to this feature, in a state in which the base member is installed on the outer peripheral surface of the neck portion of the branch pipe portion, the predetermined sealing member is inserted in the notch concave portion while visually recognizing the notch concave portion from one axial direction side of the branch pipe portion. Since the space between the base member and the neck portion of the branch pipe portion can be sealed using the sealant, the space between the base member and the neck portion of the branch pipe portion can be reliably and easily sealed.

The notch concave portion is characterized in that it is formed on the work case side of the base member.
According to this feature, it is easy to access the recess from the side of the working case, so that the sealing process can be performed easily.

The notch recess is characterized by being formed over half or more of the plate thickness of the base member.
According to this feature, a large sealing area can be secured between the base member and the neck of the branch pipe.

It is characterized in that a press ring for pressing a seal ring as a sealing member against the notch recess can be attached to the base member.
According to this feature, the sealing process between the base member and the neck can be performed with a simple configuration using the seal ring and the pressing ring.

The cutout recess is characterized by having an inclined surface extending from the end surface on one side in the axial direction so as to become deeper toward the inner diameter side.
According to this feature, when the seal ring is compressed between the notch recess and the pressing ring, the seal ring is guided by the inclined surface so as to be elastically deformed toward the neck portion of the branch pipe portion, thereby enhancing the sealing performance. be able to.

The neck portion has a straight portion that extends along the axial direction of the neck portion and abuts against the seal ring.
According to this feature, the seal ring stably abuts against the straight portion of the branch pipe portion, so that the sealing performance can be improved.

A drop prevention means for preventing the guide bolt from dropping is arranged between the base member and the guide bolt that guides attachment and detachment of the branch pipe portion and the pipe connection member.
According to this feature, it is possible to prevent the guide bolt from falling during work.

The pipe connection member removing method of the present invention comprises:
Attached to the branch pipe by a working case comprising a divided structure base member fixed to the neck of the branch pipe branched from the main pipe of the flow path component, and a case member assembled to the base member. A pipe connection member removal method for sealingly enclosing a pipe connection member that has been installed and removing the pipe connection member in a work case in an uninterrupted state, comprising:
In a state in which the divided base member is installed so as to surround the neck of the branch pipe, the inner peripheral surface of the base member and the outer peripheral surface of the neck of the branch pipe are sealed from the working case side. It is characterized by performing a sealing process to
According to this feature, in a state where the base member is installed on the outer peripheral surface of the neck of the branch pipe, the gap between the base member and the neck of the branch pipe is visually observed from the work case side and a predetermined sealing member is used. Since the space between the base member and the neck of the branch pipe can be sealed, the space between the base member and the neck of the branch pipe can be reliably and simply sealed.

FIG. 2 is a diagram showing an existing fluid pipe to which a pipe connection member is connected in Example 1 of the present invention; 2 is a diagram showing a state in which the directions of bolts and nuts are changed from the state shown in FIG. 1; FIG. (a) is a diagram showing a state in which the base member is attached to the existing fluid pipe, and (b) is a cross-sectional view taken along the line AA of (a). FIG. 10 is a diagram showing a state in which a gap between the neck of the branch pipe and the base member is sealed; (a) is a diagram showing Modification 1 of the notch recess and the pressing ring, and (b) is a diagram showing Modification 2 of the notch recess and the pressing ring. (a) is a diagram showing a state in which the bolt/nut is replaced with a guide bolt from the state of FIG. 3, and (b) is a diagram showing the structure of the anti-rotation washer and the lock nut. It is a figure which shows the state which the exchange to a guide bolt completed. (a) is a diagram showing a state in which a pressing cylinder is attached to a base member, and (b) is a top view of an existing fluid pipe to which the pressing cylinder is attached. FIG. 5 is a diagram showing a state in which the guide bolt is supported by the fall prevention means in the first embodiment; FIG. 10 is a diagram showing a state in which the pipe connection member is removed within the work case; (a) is a top view of a presser tube provided with a drop prevention means according to a second embodiment of the present invention, and (b) is a cross-sectional view taken along the line BB of (a), with the presser tube attached to a base member. It is a figure which shows. FIG. 10 is a view showing a state in the middle of replacing the bolt/nut with a guide bolt in Embodiment 3 of the present invention; (a) to (c) are diagrams showing a procedure for attaching a special nut in Example 3 of the present invention. FIG. 12 is a diagram showing a state in which the guide bolt is supported by the fall prevention means in the third embodiment; (a) is a diagram showing a fall prevention means in Embodiment 4 of the present invention, and (b) is a diagram showing a state in which the guide bolt is supported by the fall prevention means.

EMBODIMENT OF THE INVENTION The form for implementing the pipe connection member removal apparatus and the pipe connection member removal method which concern on this invention is demonstrated below based on an Example.

A pipe connection member removing device and a pipe connection member removing method according to a first embodiment will be described with reference to FIGS. 1 to 10. FIG.

As shown in FIG. 1, an existing fluid pipe 1 (hereinafter simply referred to as fluid pipe 1) as a flow passage component includes a main pipe portion 1A extending in the horizontal direction and a vertical pipe portion 1A communicating with the main pipe portion 1A. It is a so-called T-tube having a branch pipe portion 2 branching upward. The branch pipe portion 2 includes a neck portion 2A extending vertically upward from the main pipe portion 1A, and a branch pipe flange portion 3 (flange portion) provided at the upper end portion of the neck portion 2A. Here, the main pipe portion 1A or the neck portion 2A may be inclined.

In addition, in this embodiment, it is often designed with a high-pressure pipeline, and the branch pipe section 2 is formed vertically shorter than its pipe diameter, for example, so that it can be used in a space with little soil cover. It has become. Further, the neck portion 2A includes a straight portion 2a that extends linearly vertically upward from the main pipe portion 1A, and a tapered portion 2b that is inclined so as to increase in diameter from the straight portion 2a toward the branch pipe flange portion 3. A space for bolt replacement work, which will be described later, is secured below the branch pipe flange portion 3 on the tapered portion 2b side. In the first embodiment, the linear portion 2a and the tapered portion 2b (so-called neck flange) are connected with the weld bead portion 2c as an example, but they may be formed by casting or the like.

An existing pipe connection unit U1 (pipe connection member) is sealingly connected to the branch pipe flange portion 3 by interposing an annular packing 7 therebetween. This pipe connection unit U1 comprises a manhole cover 4 having a flange portion 4a fastened to a branch pipe flange portion 3 with existing bolts and nuts 10, and a repair valve 6 attached to the upper portion of the manhole cover 4. and consists of Normally, pipe connection members such as an existing air valve are connected above the repair valve 6, but in FIG. 1, by closing the repair valve 6, these pipe connection members have already been removed. is. In this case, for example, a short flange pipe or the like may be used as the pipe connecting member. Furthermore, in the first embodiment, the fluid in the fluid pipe is clean water, but it is not limited to clean water in the first embodiment. It may be a mixture.

The fluid tube 1 is made of steel in this embodiment. The fluid pipe according to the present invention may be made of ductile cast iron, formed in a substantially circular cross section, and coated with an epoxy resin layer on the inner peripheral surface. Alternatively, it may be made of concrete, vinyl chloride, polyethylene, polyolefin, or the like. 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 the inner peripheral surface of the fluid pipe may be coated with a suitable material by powder coating.

Hereinafter, a mode of removing the pipe connection unit U1 from the branch pipe flange portion 3 in an uninterrupted state by using the pipe connection member removal device (hereinafter sometimes simply referred to as "removal device") in the first embodiment. explain.

As shown in FIG. 2, first, bolts and nuts 10 having bolt heads arranged below the branch pipe flange portion 3 and the flange portion 4a (on the branch pipe flange portion 3 side) are attached to the branch pipe flange portion 3. Then, the bolts/nuts 10' are replaced with new bolts/nuts 10' one by one or a predetermined number so that the bolt heads are arranged above the flange 4a (on the side of the flange 4a). At this time, the branch pipe flange portion 3 and the flange portion 4a may be clamped by a jig (not shown) such as a vise. As a result, even if an annular base member 9, which will be described later, is attached to the fluid pipe 1, the bolt/nut 10' can be removed from above, and the space between the branch pipe flange portion 3 and the main pipe portion 1A is reduced. Even if the fluid pipe 1 is narrow, the possibility that the bolt/nut 10 cannot be removed can be avoided. In the first embodiment, the existing bolt/nut 10 is replaced with the new bolt/nut 10', but the orientation of the existing bolt/nut 10 may be changed.

Next, as shown in FIG. 3(a), the annular base member 9 (base member) is attached to the fluid pipe 1. As shown in FIG. As shown in FIGS. 3(a) and 3(b), the annular base member 9 has a split structure consisting of split members 9A and 9B, and when the split members 9A and 9B are assembled, the branch pipe portion 2 is divided into two parts. An annular plate portion 91 (annular in top view) formed to surround the straight portion 2a of the neck portion 2A, and an annular plate portion 91 extending below the annular plate portion 91 so as to be placed on the main pipe portion 1A of the fluid pipe 1. a base portion 94 formed in the .

Joint portions 93a and 93b are formed at both ends of the divided members 9A and 9B in the circumferential direction facing each other, respectively. The annular base member 9 is installed on the fluid pipe 1 by fastening the bolts and nuts N1 between the 93b. After fastening the joints 93a and 93b with bolts and nuts N1, the joints 93a and 93b are welded together to seal the separation between the split members 9A and 9B. Note that the annular base member 9 may be fixed by welding to the fluid pipe 1 and the branch portion 2 .

The base portion 94 extends in the axial direction in plan view, and has leg portions 94a, 94a (see FIG. 10) curved along the outer peripheral surface of the main pipe portion 1A in the axial view, and leg portions 94a, 94a and an annular shape. and a plurality of rib portions 94 b that connect the plate portion 91 . The annular base member 9 only needs to have at least the annular plate portion 91. Instead of the base portion 94, for example, a concrete foundation for supporting the annular plate portion 91 may be provided. 91 may be configured, and depending on the condition of the ground around the existing fluid pipe and the size of the work case to be installed on the existing fluid pipe, iron plates and lumber may be laid on the excavated ground, Ground excavated to a suitable depth position may be used, or the tubular body of the fluid tube 1 may be used. Furthermore, the annular base member 9 is not limited to being divided into two, and may be composed of three or more divided members.

On the inner diameter side of the annular plate portion 91, an annular cutout recess 92 formed so as to surround the circumference of the straight portion 2a of the neck portion 2A is formed on the inner diameter side and the upper side (one side of the branch portion 2 in the axial direction in this embodiment). side). The cutout recess 92 includes a vertical surface 92a extending substantially vertically downward from the upper surface of the annular plate portion 91, a flat surface 92c extending substantially horizontally from the lower end of the vertical surface 92a to the inner diameter side, and an inner diameter side end of the flat surface 92c. and an inclined surface 92d inclined so as to become deeper from the portion toward the inner diameter side. In addition, a plurality of screw holes 92e for attaching a pressing ring 20, which will be described later, are formed in the flat surface 92c along the circumferential direction. Further, a screw hole 92f is formed on the outer diameter side of the annular plate portion 91 for attaching a pressing cylinder 21, which will be described later.

The depth of the notch recess 92 is approximately equal to the plate thickness of the annular plate portion 91 . The depth of the cutout recess 92 can be changed as appropriate. In addition, as long as the cutout recess 92 is open to the inner diameter side and one axial direction side of the branch pipe portion 2, there is no limitation on the processing method thereof. Alternatively, an annular wall portion rising from the upper surface of the annular plate portion 91 is provided, and the wall portion and the upper surface of the annular plate portion 91 on the inner diameter side of the wall portion may be formed.

Next, as shown in FIG. 4, between the inclined surface 92d of the notch recess 92 and the outer peripheral surface of the straight portion 2a of the neck portion 2A, a seal ring 11 made of an elastic member and having a substantially circular cross-sectional shape in a natural state is placed. (sealing member) is arranged, and the ring-shaped push ring 20 is attached to the flat surface 92c of the notch recess 92 with a bolt N2. The push ring 20 has a divided structure made up of a plurality of arc-shaped plate members, and by fastening bolts N2 to the screw holes 92e, the seal ring 11 is vertically crushed between the push ring 20 and the inclined surface 92d. , thereby sealing between the annular base member 9 and the neck portion 2A. More specifically, since the seal ring 11 is in contact with the straight portion 2a of the neck portion 2A, it is more stable than when it is in contact with the tapered portion 2b, and the sealing performance is improved. Here, the head of the bolt N2 may not protrude upward as in Modification 1, which will be described later.

Further, when the seal ring 11 is compressed vertically between the pressing ring 20 and the inclined surface 92d, the inclined surface 92d guides the seal ring 11 to be elastically deformed toward the neck portion 2A, thereby improving the sealing performance. can be done. In addition, since the seal ring 11 has a substantially circular cross-sectional shape in its natural state, the seal ring 11 can be elastically deformed evenly when it is vertically crushed between the pressing ring 20 and the inclined surface 92d.

Further, since the thickness of the pressing ring 20 is substantially the same as that of the vertical surface 92a, when the pressing ring 20 is attached to the annular plate portion 91, the pressing ring 20 protrudes upward from the upper surface of the annular plate portion 91. , and fits within the notch recess 92 . Although the seal ring 11 has a substantially circular cross-sectional shape, the cross-sectional shape is not limited to this, and the cross-sectional shape can be changed as appropriate. Moreover, the seal ring 11 is not limited to being endless in the circumferential direction. It may be processed so as to be continuous in the circumferential direction when attached to the plate portion 91 .

Here, modified examples of the cutout recess and the pressing ring will be described. As a modified example 1 of the notch recess and the pressing ring, as shown in FIG. A horizontal surface 920e extending in a substantially horizontal direction toward the inner diameter side from the lower end of is formed.

The pressing ring 200 of Modification 1 includes a flat plate portion 200a and a protruding portion 200b protruding downward from the inner diameter side end portion of the flat plate portion 200a, and has a substantially L-shaped cross section. When the press ring 200 is attached to the annular plate portion 91 with the bolts N2, the seal ring 11 is pressed by the vertical surface 920d, the horizontal surface 920e and the projecting portion 200b, and the space between the annular base member 9 and the straight portion 2a of the neck portion 2A is sealed. be. In this way, the notch recess does not necessarily have to be formed with an inclined surface. Further, since the flat plate portion 200a of the pressing ring 200 is formed with the accommodation recess 200c for accommodating the head portion of the bolt N2, the head portion of the bolt N2 does not protrude above the upper surfaces of the pressing ring 200 and the annular plate portion 91. can be done. Alternatively, the bolt N2 may be a countersunk screw so that it does not protrude above the upper surfaces of the pressing ring 200 and the annular plate portion 91 .

Further, as a modified example 2 of the cutout recess and the pressing ring, as shown in FIG. , has the same shape as the notch recess 92 . An annular rising piece 95 rising upward is formed on the upper surface of the annular plate portion 91 on the outer diameter side of the cutout recess 92 ′. A plurality of holes 95a are formed along the circumferential direction (only one is shown here). A bolt N3 is screwed into the screw hole 95a, and the inner diameter side end of the bolt N3 is tapered. Further, the push ring 201 of Modification 2 includes an annular flat plate portion 201a and a rising piece 201b rising upward from the flat plate portion 201a. A contactable tapered surface 201c is formed.

With the bolt N3 retracted to the outer diameter side, the push ring 201 is placed on the flat surface 92c of the notch recess 92', and the bolt N3 is advanced to the inner diameter side, so that the inner diameter side end portion of the bolt N3 rises. Contacting the tapered surface 201c of the piece 201b, the pressing ring 201 moves in the direction of crushing the seal ring 11 toward the inclined surface 92d. In this way, by operating the bolt N3 from the outer diameter side, the seal ring 11 can be clamped between the push ring 201 and the inclined surface 92d. Even so, it is easy to operate the push ring 201 without interfering with the taper portion 2b or the branch pipe flange portion 3.

Returning to the first embodiment, the bolt/nut 10' is replaced with a guide bolt 12 as shown in FIG. 6(a). Specifically, the bolts/nuts 10' are removed one by one or by a predetermined number, and the guide bolts 12 are inserted. At this time, the branch pipe flange portion 3 and the flange portion 4a may be clamped by a jig (not shown) such as a vise. After that, while supporting the guide bolt 12, the anti-rotation washer 13 is inserted from below and the lock nut 14 is screwed.

As shown in FIG. 6(b), the anti-rotation washer 13 includes a plate portion 13a having a rectangular shape as viewed from the bottom and capable of coming into contact with the lower surface of the branch pipe flange portion 3, and a first plate portion 13a rising upward from one side of the plate portion 13a. It has a piece 13b and second pieces 13c, 13c extending downward from both sides adjacent to one side of the plate portion 13a. When the lock nut 14 is tightened from below the guide bolt 12 and the plate portion 13a of the anti-rotation washer 13 contacts the lower surface of the branch pipe flange portion 3, the lower end of the guide bolt 12 and the upper surface of the annular plate portion 91 Adjust so that there is a specified distance between them.

Then, as shown in FIG. 7, the nut 15 is tightened from above the guide bolt 12, and the nut 15 and the lock nut 14 move the branch pipe flange portion 3, the flange portion 4a, and the anti-rotation washer 13 vertically. hold on to. At this time, the first piece 13b of the anti-rotation washer 13 abuts against the outer peripheral surface of the branch pipe flange portion 3, and the lock nut 14 is arranged between the second pieces 13c, 13c with its rotation restricted. be. This prevents the anti-rotation washer 13 and the lock nut 14 from unintentionally rotating and loosening.

Next, as shown in FIG. 8A, the presser cylinder 21 is fixed to the upper surface of the annular plate portion 91 using bolts N4. This presser cylinder 21 is a tubular body surrounding the periphery of the branch pipe portion 2, and a presser piece 22 (fall prevention means) that can be advanced and retracted in the radial direction by being operated from the outside is attached to the lower end portion of the above-described guide. A plurality of the bolts 12 are provided spaced apart in the circumferential direction so as to correspond to the bolts 12 . In addition, a plurality of fixing pins 23 are provided at the upper end portion of the presser cylinder 21 so as to be spaced apart in the circumferential direction so that they can be advanced and retracted in the radial direction by being operated from the outside. An annular O-ring 24 is disposed on the lower end surface of the pressing cylinder 21 , and the O-ring 24 is squeezed between the annular plate portion 91 and the pressing cylinder 21 so that the annular plate portion 91 and the pressing cylinder 21 are pressed together. It is hermetically connected to the presser cylinder 21 . For convenience of explanation, the branch pipe flange portion 3 and the pipe connection unit U1 are omitted in FIG. 8(b).

Thereafter, as shown in FIG. 9, the plurality of pressing pieces 22 are sequentially moved radially inward, and the tip members 22a of the pressing pieces 22 are press-fitted between the lower end of the guide bolt 12 and the upper surface of the annular plate portion 91. Since the upper surface of the tip member 22a is formed with an inclined surface 22b that slopes downward toward the inner diameter side, the tip member 22a is press-fitted between the lower end of the guide bolt 12 and the upper surface of the annular plate portion 91. Cheap.

Further, the fixing pin 23 is moved to the inner diameter side, and the tip portion of the fixing pin 23 is engaged with the upper edge of the outer peripheral side of the flange portion 4a. The fixing pin 23 is a bolt having a tapered shape with a tapered tip on the inner diameter side. It can be advanced and retreated in the direction.

Next, as shown in FIG. 10, a lower working case 25, a working valve device 26, an upper working case 27, and an inserter mounting lid 28 are assembled in this order in an airtight manner on the upper portion of the presser cylinder 21 to form a working case 30. , and the inserter 29 is hermetically attached to the inserter attachment lid 28 . That is, the work case 30 is composed of an annular base member 9, a presser cylinder 21 assembled on the annular base member 9, a lower work case 25, a work valve device 26, an upper work case 27, and an inserter mounting lid 28. The pressing cylinder 21, the lower work case 25, the work valve device 26, and the upper work case 27 function as case members. Note that the work case 30 is not limited to the form of the first embodiment, and the aspect of the divided structure and the like can be appropriately set as long as it is configured to be able to enclose at least the tube connection member in a sealed manner.

Next, the sling fitting 16 connected to the repair valve 6 is connected to the inserter 29 using a window provided in the case member so as to be openable and closable. Then, the nut 15 is removed from the guide bolt 12 and sealed, and water is poured into the working case 30 to make the pressure in the fluid pipe 1 approximately the same. As described above, since the tip member 22a of the pressing piece 22 is press-fitted between the lower end of the guide bolt 12 and the upper surface of the annular plate portion 91, even if the nut 15 is removed from the guide bolt 12 from the state shown in FIG. It is possible to prevent the guide bolt 12 from falling.

After that, the fixing pin 23 is retracted in the outer diameter direction to release the locking fixation of the manhole cover 4 by the fixing pin 23, and the insertion machine 29 is operated to operate the repair valve 6 and the manhole cover 4 (pipe connection unit U1). ) to close the valve body (not shown) of the working valve device 26 . As a result, the operation of removing the pipe connection unit U1 from the branch pipe portion 2 in a non-interrupted state is completed. Although not shown here, when connecting the new pipe connection unit to the branch pipe section 2 following the removal work described above, the new pipe connection unit is connected to the branch pipe section 2 in the reverse order of the above work. do. Since the guide bolt 12 guides the lifting direction of the pipe connection unit U1 and the connection direction of the new pipe connection unit, the removal and replacement of the pipe connection member from the branch pipe portion 2 can be performed accurately.

Further, after removing the pipe connection unit U1 from the branch pipe portion 2 in a non-interrupted state and connecting a new pipe connection unit to the branch pipe portion 2 in a non-interrupted state, the working case 30 is moved to the fluid pipe 1. Remove from It should be noted that the annular base member 9 may remain in the fluid pipe 1 by removing the presser cylinder 21, the lower working case 25, the working valve device 26, the upper working case 27, and the insertion machine mounting lid 28.

As described above, the pipe connection member removing device of the first embodiment has seals that open to the upper side (one side in the axial direction) and the inner diameter side of the branch pipe portion 2 on the annular plate portion 91 of the annular base member 9. A notch recess 92 for the ring 11 is formed so as to surround the neck portion 2A of the branch pipe portion 2 . According to this, in a state in which the annular plate portion 91 is annularly installed on the outer peripheral surface of the neck portion 2A of the branch pipe portion 2, the notch recess portion 92 is viewed from the upper side of the branch pipe portion 2, and in the notch recess portion 92. Since the seal ring 11 can be used to seal between the annular plate portion 91 and the neck portion 2A of the branch pipe portion 2, the annular plate portion 91 and the branch pipe portion 2 can be sealed regardless of the manufacturing accuracy and mounting accuracy of the annular plate portion 91. can be reliably and easily sealed with the neck portion 2A.

In addition, the cutout recess 92 is formed on the work case 30 side of the annular plate portion 91, and compared to performing sealing processing on the cutout recess 92 from the main pipe portion 1A side of the fluid pipe 1, the working case 30 is more likely to be sealed. Since the notch recess 92 is easily accessible from the case 30 side, the sealing process can be easily performed. In particular, it is useful when removing the pipe connection unit U1 connected to the branch pipe portion 2, which is shorter than the general branch pipe portion as in the first embodiment, in an uninterrupted state. Furthermore, during the work of removing the tube connection unit U1, the pressure of the fluid in the work case 30 acts in the direction of crushing the seal ring 11, thereby improving the sealing performance.

Moreover, the notch recess 92 is formed over half or more of the plate thickness of the annular plate portion 91 . Specifically, since the depth of the notch recess 92 is substantially equal to the plate thickness of the annular plate portion 91, the seal ring 11 is vertically crushed between the annular plate portion 91 and the push ring 20. When the seal ring 11 contacts the neck portion 2A of the branch pipe portion 2, a large area (sealing area) can be secured.

In addition, a pressing ring 20 serving as a sealing member for pressing the seal ring 11 against the notch recess 92 can be attached to the annular plate portion 91 . , the sealing process between the annular plate portion 91 and the neck portion 2A can be performed.

In addition, since the notch recess 92 has an inclined surface 92 d that extends from the upper surface of the annular plate portion 91 toward the inner diameter side so as to become deeper, the seal ring 11 is positioned between the notch recess 92 and the press ring 20 . When the pressure is narrowed, the seal ring 11 is guided by the inclined surface 92d so as to be elastically deformed toward the neck portion 2A of the branch pipe portion 2, so that the sealing performance can be enhanced. Incidentally, the inclined surface 92d may be formed in at least a part of the notch recess 92. As shown in FIG.

In addition, since the seal ring 11 abuts on the straight portion 2a extending along the axial direction of the neck portion 2A, the seal ring 11 does not touch the tapered portion 2b and the weld bead portion 2c between the straight portion 2a and the tapered portion 2b. Since it stably abuts on the straight portion 2a of the branch pipe portion 2, it is possible to improve the sealing performance.

Between the guide bolt 12 that guides the attachment and detachment of the branch pipe portion 2 and the pipe connection, and the annular plate portion 91, a pressing piece 22 that prevents the guide bolt 12 from falling is arranged. Even if the nut 15 is removed from the guide bolt 12, the guide bolt 12 can be prevented from falling.

Further, in the pipe connecting member removing method of the first embodiment, in a state in which the divided annular plate portion 91 is annularly installed so as to surround the neck portion 2A of the branch pipe portion 2, the annular plate portion 91 is removed from the work case 30 side. and the outer peripheral surface of the neck portion 2A of the branch pipe portion 2 are sealed. According to this, in a state where the annular plate portion 91 is installed on the outer peripheral surface of the neck portion 2A of the branch pipe portion 2, the space between the annular plate portion 91 and the neck portion 2A of the branch pipe portion 2 can be visually recognized from the work case 30 side. However, since the seal ring 11 can be used to seal between the annular plate portion 91 and the neck portion 2A of the branch pipe portion 2, the seal between the annular plate portion 91 and the neck portion 2A of the branch pipe portion 2 can be reliably and simply sealed. can do.

In addition, in the first embodiment, the cutout recess 92 is formed so as to open to the upper side (the work case 30 side) of the annular plate portion 91, but is not limited to this, and the lower side of the annular plate portion 91 is formed. It may be formed so as to open to (the side opposite to the work case 30).

In addition, in the first embodiment, the configuration in which the annular base member 9 is installed so as to surround the circumference of the neck portion 2A of the branch pipe portion 2 by fastening the split members 9A and 9B with the bolts and nuts N1 was illustrated. Alternatively, the annular base member 9 may be provided with a set bolt, and the set bolt may be bitten into the fluid pipe 1 for installation. Further, when the annular base member 9 is installed in the fluid pipe 1 in a sealed manner, the annular base member 9 does not have to be fixed to the fluid pipe 1 . Further, the joints 93a and 93b of the divided members 9A and 9B are not limited to being welded and sealed after fastening the joints 93a and 93b of the divided members 9A and 9B with the bolts and nuts N1. etc., can be sealed.

Further, in the first embodiment, the seal ring 11 is used as the sealing member, but the gap between the notch recess 92 and the neck portion 2A of the branch pipe portion 2 may be sealed by welding, hardening resin, or the like. . Furthermore, the notch recess 92 is not necessarily formed, but the annular base member is formed in a flat plate shape, and the gap between the annular base member and the neck portion 2A of the branch pipe portion 2 is one axial direction of the neck portion 2A. It may be sealed from one side or from both sides by welding, hardening resin, or the like.

Further, in the first embodiment, the pipe connection unit U1 as a pipe connection member is configured by the manhole lid 4 and the repair valve 6, but the pipe connection member may be a valve lid, a repair valve, or the like. It can be changed as appropriate.

Next, a pipe connection member removing device and a pipe connection member removing method according to the second embodiment will be described with reference to FIG. It should be noted that the description of the configuration that is the same as that of the first embodiment and overlaps will be omitted.

As shown in FIG. 11, the presser cylinder 210 of the second embodiment has a two-split structure composed of arcuate members 210a and 210b split in the circumferential direction. The presser cylinder 210 is assembled by tightening bolts and nuts N5 with packings 17, 17 interposed between joints 210c, 210d formed at both circumferential ends of circular arc members 210a, 210b. .

Further, an annular projecting portion 210e projecting radially inward is formed on the lower side of the presser cylinder 210, and the projecting portion 210e supports the lower ends of the plurality of guide bolts 12 collectively. According to this, even if the nut 15 is removed from the guide bolt 12, the guide bolt 12 can be prevented from falling. In other words, the protruding portion 210e functions as the fall prevention means in the second embodiment. Moreover, since the protruding portion 210e is formed in an annular shape, it is not necessary to align it with the plurality of guide bolts 12 in the circumferential direction, and can be easily supported. It should be noted that the pressing cylinder 210 may be divided into three or more sections. Also, arcuate members may be sealed together by welding or by a hardening resin.

Next, a pipe connection member removing device and a pipe connection member removing method according to the third embodiment will be described with reference to FIGS. 12 to 14. FIG. It should be noted that the description of the configuration that is the same as that of the first embodiment and overlaps will be omitted.

As shown in FIG. 12, the bolt/nut 10' connecting the branch pipe flange portion 3 and the flange portion 4a is replaced with a guide bolt 12, and a lock nut 14 is inserted through a rotation prevention washer 13 from below the guide bolt 12. screw together.

Next, as shown in FIG. 13( a ), the special nut 18 is arranged between the lower end of the guide bolt 12 and the upper surface of the annular plate portion 91 . At this time, the guide bolt 12 is not screwed into the female screw portion 18a formed on the inner peripheral surface of the special nut 18. As shown in FIG. Next, as shown in FIG. 13(b), the lower end of the guide bolt 12 is screwed into the female screw portion 18a of the special nut 18, and the anti-rotation washer 13 is locked until it engages with the branch pipe flange portion 3. A nut 14 is screwed upward onto the guide bolt 12 . By doing so, the special nut 18 is pressed against the upper surface of the annular plate portion 91 and thereby supports the guide bolt 12 . Then, as shown in FIG. 13(c), the nut 15 is tightened from above the guide bolt 12, and the nut 15 and the lock nut 14 connect the branch pipe flange portion 3, the flange portion 4a, and the anti-rotation washer 13. is held vertically.

By doing so, as shown in FIG. 14, the operation of replacing the bolt/nut 10' with the guide bolt 12 is completed. Since the special nut 18 is placed on the upper surface of the annular plate portion 91 and supports the guide bolt 12 , it is possible to prevent the guide bolt 12 from falling even if the nut 15 is removed from the guide bolt 12 . That is, the special nut 18 functions as a fall prevention means in the third embodiment. Further, a bolt other than the guide bolt 12 may be screwed into the female threaded portion 18a of the special nut 18 to prevent the nut from dropping.

Next, a pipe connection member removing device and a pipe connection member removing method according to the fourth embodiment will be described with reference to FIG. It should be noted that the description of the configuration that is the same as that of the first embodiment and overlaps will be omitted.

FIG. 15(a) shows a ring member 19 as a fall prevention means in the fourth embodiment. In this embodiment, the ring member 19 has a two-split structure composed of metal arcuate members 19a and 19b that are split in the circumferential direction. Concave portions 19d having narrowed portions 19c are formed at both ends of the arc-shaped member 19a in the circumferential direction, and engaging portions 19e that can be engaged with the concave portions 19d are formed at both ends of the arc-shaped member 19b in the circumferential direction. formed. The engaging portion 19e protrudes in the circumferential direction from both circumferential ends of the arc-shaped member 19b, and bulges radially from the first portion 19f that is loosely fitted in the narrowed portion 19c and the tip of the first portion 19f. and a second portion 19g that is engaged with the end surface of the wall portion that constitutes the narrowed portion 19c on the recessed portion 19d side. The ring member may have a structure divided into three or more.

As shown in FIG. 15(b), the arcuate members 19a and 19b are arranged so as to surround the neck portion 2A of the branch pipe portion 2, and the arcuate member 19b is engaged with the concave portion 19d of the arcuate member 19a. The ring member 19 is constructed by engaging the joining portion 19e. The arc-shaped members 19a and 19b are not limited to the engagement connection by the concave portion 19d and the engagement portion 19e, and may be connected by adhesion, welding, screws, or the like, or may not be connected.

This ring member 19 is placed and supported on the bolt N2. The ring member 19 may be placed on the upper surface of the annular plate portion 91, or may be fixed around the neck portion 2A by welding or the like.

This ring member 19 supports the lower end of the guide bolt 12 . According to this, even if the nut 15 is removed from the guide bolt 12, the guide bolt 12 can be prevented from falling. Note that the ring member 19 may be divided into three or more sections. Moreover, the ring member 19 is not limited to being made of metal, and may be made of ductile cast iron, other cast iron, or resin such as concrete, vinyl chloride, polyethylene, or polyolefin.

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

For example, in Examples 1 to 4, the branch pipe portion 2 is shorter in the branch pipe axial direction than its pipe diameter, but the extension of the branch pipe portion may be freely changed. Further, in Examples 1 to 4, the neck portion 2A of the branch pipe portion 2 includes the straight portion 2a and the tapered portion 2b, but the neck portion 2A may include only the straight portion, for example. Further, although the annular base member 9 is formed in an annular shape in top view in the present embodiment, it is not limited to this, and may be square, elliptical, or the like.

1 Existing fluid pipe (flow path constituent member)
1A Main pipe portion 2 Branch pipe portion 2A Neck portion 2a Straight portion 2b Taper portion 3 Branch pipe flange portion 4 Manhole cover (pipe connection member)
4a flange portion 6 repair valve (pipe connecting member)
9 Annular base member (base member)
11 seal ring (sealing member)
12 guide bolt 18 special nut (drop prevention means)
19 ring member (fall prevention means)
20 pressing ring 21 pressing tube (case member)
22 presser foot (fall prevention means)
23 Fixing pin 25 Lower work case (case member)
27 Upper work case (case member)
30 work case 91 annular plate (base member)
92 Notch concave portion 92d Slanted surface 94 Base portions 200, 201 Press ring 210 Press tube (case member)
920 notch recess

Claims (6)

A work case comprising: a base member with a split structure fixed to the neck of a branch pipe section integrally branched from a main pipe section of an existing flow path constituting member; and a case member hermetically assembled to the base member. A pipe connection member removing device for sealingly enclosing a pipe connection member attached to the branch pipe portion by a pipe connection member and removing the pipe connection member in the work case in an uninterrupted state,
The base member is provided with a sealing portion that seals the neck portion of the branch pipe portion, and an annular sealing portion that seals between the base member and the case member is provided on the outer diameter side of the branch pipe portion relative to the sealing portion. A pipe connecting member removing device, characterized in that a sealing ring of . 2. The pipe connecting member removing device according to claim 1, wherein the sealing portion is formed on the work case side of the base member. 3. The pipe connecting member removing device according to claim 1, wherein a push ring for pressing a seal ring as said sealing portion can be attached to said base member. 4. The pipe connection member removing device according to claim 3, wherein the neck portion has a straight portion extending along the axial direction of the neck portion and abutting against the seal ring. A guide bolt for guiding attachment and detachment of the branch pipe portion and the pipe connection member, and a rotation prevention washer for preventing rotation of a nut screwed onto the guide bolt are provided. 5. The pipe connection member removing device according to any one of 4. A drop preventing means for preventing the guide bolt from dropping is arranged between the guide bolt for guiding attachment and detachment of the branch pipe portion and the pipe connection member and the base member. Item 6. A pipe connection member removing device according to any one of items 1 to 5.

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