JP7123378B2 - Fluid pipe full-cut cutting method and full-cut cutting device - Google Patents

Description

The present invention relates to a method and apparatus for performing so-called full-cut cutting, in which a fluid tube is cut axially using a piercing machine.

Conventionally, an existing water pipe (an example of a fluid pipe) is hermetically surrounded by a housing, and after the water pipe is fully cut inside the housing without water interruption, a valve device or the like is installed at the cut portion of the water pipe. The construction of inserting inserts is known. Such construction is described in Patent Documents 1 to 3, for example.

Generally, for full-cut cutting, a boring machine 9 having a cylindrical hole saw 91 as shown in FIG. 10 and a center drill 92 positioned at the center of its axis is used. Since the diameter of the hole saw 91 is larger than the pipe diameter of the water pipe 1, the hole saw 91 can cut the water pipe 1 in the direction of the pipe axis (the direction perpendicular to the paper in FIG. 10). The peripheral wall of the water pipe 1 accommodated inside the hole saw 91 becomes a short tubular segment 10 . The center drill 92 penetrates the segment 10 produced by the full-cut cutting, and drop-off prevention pieces 93 and 94 provided on the center drill 92 are arranged inside the segment 10 .

After completing the full cut cutting, the drilling machine 9 is pulled up and the hole saw 91 and the center drill 92 are arranged outside the housing 8 . At that time, the section 10 can be recovered by hooking the falling prevention piece 93 on the inner surface of the section 10 . The center drill 92 is provided with a plurality of (two in the example of FIG. 10) drop-off prevention pieces 93 and 94 at different heights. As a result, when the uppermost drop-off prevention piece 93 is not caught, the piece 10 can be recovered by hooking the drop-off prevention piece 94 below it, and the accuracy of the piece 10 recovery is enhanced.

FIG. 10 shows the position of the hole saw 91 when the water pipe 1 is completely disconnected. Immediately after this full-cut cutting, the section 10 falls over the distance D1 and is caught by the fall prevention piece 93.例文帳に追加The distance D1 corresponds to the vertical distance from the inner surface of the piece 10 to the fall prevention piece 93 . If the piece 10 does not catch on the drop-off preventing piece 93 but catches on the drop-off preventing piece 94 below it, the piece 10 will fall a distance (D1+D2). The distance D2 corresponds to the vertical distance from the drop-off preventing piece 93 to the drop-off preventing piece 94. As shown in FIG. In FIG. 10, the piece 10 caught on the fall prevention piece 94 is drawn with a broken line.

Since the dropped piece rotates together with the hole saw 91, when it comes into contact with the bottom inner surface 8f of the housing 8, damage such as peeling of the inner surface coating of the housing 8 is caused, and rust is generated from there, affecting water quality. There is a risk of Therefore, it is necessary to secure a large vertical distance D3 from the piece 10 to the bottom inner surface 8f so that the piece 10 caught on the drop-off prevention piece 94 does not come into contact with the bottom inner surface 8f, thereby providing a spatial margin. As a result, it is difficult to miniaturize the housing 8 (the lower member 82 thereof). Under such circumstances, it is conceivable to reduce the distance D1 and the distance D2 in order to construct the housing 8 compactly, but it has been found that neither of them is suitable for practical use as described below.

That is, in order to hook the drop-off prevention piece 93, the drop-off prevention piece 93 has to be separated from the inner surface of the section 10 appropriately, and the distance D1 must be kept at a predetermined value or more. Especially when the water pipe 1 is a steel pipe, burrs are generated on the inner surface of the section 10 when the center drill 92 penetrates. there were. On the other hand, preparing a drill exclusively for steel pipes is not desirable from the economic point of view. In light of the significance of providing a plurality of drop-off prevention pieces 93 and 94 at different heights, it was also necessary to secure a distance D2 greater than a predetermined value.

JP 2016-61391 A JP 2016-70464 A JP 2016-223528 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a full-cut cutting method and a full-cut cutting apparatus for a fluid pipe, which prevents the inner surface of the bottom of the housing from being damaged by a piece and allows the housing to be compactly configured.

A method for full-cut cutting a fluid pipe according to the present invention comprises a cutting step of full-cut cutting the fluid pipe in a non-flow state with a boring machine inside a housing that hermetically surrounds the fluid pipe, and after the cutting step. and a recovery step of pulling up the perforator and hooking and recovering the section produced by the full-cut cutting with the perforator, and in the cutting step, the section is arranged between the section and the bottom inner surface of the housing. The falling of the section is regulated by the regulated fall regulating member. In this method, the dropping of the piece is restricted by the drop regulating member arranged between the piece and the bottom inner surface of the housing, so that the piece is prevented from coming into contact with the bottom inner surface of the housing. Therefore, the inner surface of the bottom of the housing can be prevented from being damaged by the pieces, and the housing can be made compact.

The fall regulating member is arranged inside the housing through a hole provided in the bottom of the housing, and is arranged so as to protrude from the inner surface of the bottom of the housing toward the fluid pipe. Support is preferred. In this case, by supporting the piece from below with the drop-regulating member projecting toward the fluid pipe from the inner surface of the bottom portion of the housing, the piece can be appropriately prevented from falling.

The hole is a discharge hole provided in the center portion of the bottom of the housing, and the tip portion of the fall regulating member is positioned inside the projected area in the axial direction of the discharge hole in response to an operation from the outside. The tip portion of the drop regulating member can be changed in posture between a first posture in which it is arranged and a second posture in which the tip portion is arranged outside the projection area, and is in the second posture. is preferably brought into contact with the section to support the section from below. In this method, the fall control member is arranged inside the housing through the discharge hole, so there is no need to drill holes in the housing for the fall control member. The first posture is useful when the drop regulating member is taken in and out of the housing. In the second posture, the tip of the drop regulating member is arranged outside the projection area of the discharge hole. can be supported from

The drop regulating member is capable of adjusting the amount of protrusion from the inner surface of the bottom of the housing in accordance with an operation from the outside. It may be supported by In this case, by appropriately increasing the amount of protrusion of the drop-regulating member, it is possible to appropriately regulate the dropping of the piece. Also, by appropriately reducing the amount of protrusion of the drop regulating member, it is possible to prevent the distal end portion from interfering with the insert inserted into the cut portion of the fluid pipe.

After the recovering step, an inserting step of inserting the insert into the cut portion of the fluid pipe is provided, and a sealing material seals between the bottom outer surface of the insert inserted in the inserting step and the bottom inner surface of the housing. Alternatively, the drop restricting member may be removed from the housing after preventing the fluid flowing in the fluid pipe from reaching the hole. Thereby, the fall control member can be safely removed from the housing.

The fall regulating member is formed of a cushioning material attached to the fluid pipe so as to be disposed between the piece and the inner surface of the bottom of the housing. The member may be recovered. According to such a method, the fall of the section can be appropriately regulated by the fall regulating member formed of the cushion material. Since the cushioning material is attached to the fluid tube so that it is positioned between the segment and the bottom inner surface of the housing, no manipulation or work is required below the housing.

Further, a full-cut cutting device for a fluid pipe according to the present invention includes a housing that seals and surrounds a fluid pipe, a perforator for full-cut cutting the fluid pipe inside the housing, and a fall restricting member disposed between the resulting piece and the bottom inner surface of the housing and configured to restrict the dropping of the piece. According to this device, the dropping of the piece can be regulated by the drop regulating member arranged between the piece and the bottom inner surface of the housing, so that the piece is prevented from contacting the bottom inner surface of the housing. Therefore, the inner surface of the bottom of the housing can be prevented from being damaged by the pieces, and the housing can be made compact.

The fall regulating member is arranged inside the housing through a hole provided in the bottom of the housing, and is arranged to project from the inner surface of the bottom of the housing toward the fluid pipe. It is preferably configured to support. In this case, by supporting the piece from below with the drop-regulating member projecting toward the fluid pipe from the inner surface of the bottom portion of the housing, the piece can be appropriately prevented from falling.

The hole is a discharge hole provided in the center portion of the bottom of the housing, and the tip portion of the fall regulating member is positioned inside the projected area in the axial direction of the discharge hole in response to an operation from the outside. The tip portion of the drop regulating member can be changed in posture between a first posture in which it is arranged and a second posture in which the tip portion is arranged outside the projection area, and is in the second posture. is preferably configured to support the section from below by bringing the section into contact with the section. In this device, the fall control member is arranged inside the housing via the discharge hole, so there is no need to drill holes in the housing for the fall control member. The first posture is useful when the drop regulating member is taken in and out of the housing. In the second posture, the tip of the drop regulating member is arranged outside the projection area of the discharge hole. can be supported from

The drop regulating member is capable of adjusting the amount of protrusion from the inner surface of the bottom of the housing in accordance with an operation from the outside. It may be configured to be supported from. In this case, by appropriately increasing the amount of protrusion of the drop-regulating member, it is possible to appropriately regulate the dropping of the piece. Also, by appropriately reducing the amount of protrusion of the drop regulating member, it is possible to prevent the distal end portion from interfering with the insert inserted into the cut portion of the fluid pipe.

The fall control member may be formed of a cushioning material that can be attached to the fluid pipe so as to be arranged between the piece and the bottom inner surface of the housing. According to such a configuration, the falling of the section can be properly regulated by the fall regulating member formed of the cushioning material. Since the cushioning material is attached to the fluid tube so that it is positioned between the segment and the bottom inner surface of the housing, no manipulation or work is required below the housing. In order to easily attach the fall control member, it is preferable that the fall control member can be mounted by winding it around the fluid pipe via a mounting member extending along the circumferential direction of the fluid pipe. .

Longitudinal cross-sectional view of the water pipe before full cut cutting as seen from the side Longitudinal cross-sectional view of the water pipe in Fig. 1 viewed from the pipe axis direction FIG. 4 is a diagram showing a state in which dropping of a piece is restricted in the first embodiment of the present invention; Top view and front view of the fall control device The figure which shows the state which inserted the valve apparatus in the cut part of the water pipe of FIG. The figure which shows the state which restricts the fall of a piece in 2nd Embodiment of this invention. The figure which shows the state which inserted the valve apparatus in the cut part of the water pipe of FIG. The figure which shows the state which attached the fall control member in 3rd Embodiment of this invention to the water pipe. The figure which shows the state which restricts the fall of a piece in 3rd Embodiment of this invention. Longitudinal cross-sectional view showing a state in which a water pipe is fully cut

An embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 and 2 each show an existing water pipe 1 (an example of a fluid pipe) that constitutes part of a pipeline. The water pipe 1 is a ductile cast iron pipe, but is not limited to this, and may be, for example, a steel pipe. In this embodiment, an example is shown in which a valve device (an example of an insert) is inserted into the cut portion of the water pipe 1 after the water pipe 1 is fully cut in a non-stop water condition (non-interruption condition). Such construction is performed, for example, in order to provide a bypass pipeline by branching the existing pipeline before and after the section where the water pipe is to be renewed.

The housing 2 hermetically surrounds a portion of the water pipe 1 in a state of water flow. The housing 2 has a split structure that can be fitted onto the existing water pipe 1, and more specifically, has an upper and lower split structure in which an upper member 21 and a lower member 22 are joined together. This joining is performed by a fastener (not shown) consisting of a bolt and a nut, but it may be joined by welding or the like instead. A bottom portion 2B of the housing 2 is formed in a mortar shape. A discharge hole 23 for discharging chips generated during cutting is provided in the central portion of the bottom portion 2B. The discharge hole 23 is open in its axial direction (vertical direction in FIG. 1) and in a direction perpendicular to its axial direction, and is fitted with plugs 23a and 23b, respectively.

The housing 2 has a T-tube shape, and a branch portion 24 extending in a direction intersecting the axial direction of the water pipe 1 (horizontal direction in FIG. 1) faces upward. A work gate valve 26 (hereinafter simply referred to as “work valve 26”) is connected to the branch portion 24 via a cylindrical adapter 25 . A drilling machine 3 for cutting the water pipe 1 in a full cut is installed above the housing 2 . The drilling machine 3 includes a cylindrical hole saw 31 and a center drill 32 located at the center of its axis, which are arranged inside a sealed case 27 connected to a working valve 26 . In FIG. 1, the working valve 26 is in a closed state, and the internal space of the housing 2 and the internal space of the sealing case 27 are separated by the valve body 26v.

Since the diameter of the hole saw 31 is larger than the pipe diameter of the water pipe 1, the water pipe 1 can be separated in the pipe axial direction. The center drill 32 is provided with a plurality of (two in the example of FIG. 1) drop-off prevention pieces 33 and 34 at different heights. The drop-off preventing piece 33 is pivotally supported in a recess formed on the outer surface of the center drill 32 so as to be vertically rotatable. When penetrating the peripheral wall of the water pipe 1, the drop-off prevention piece 33 rotates upward so as not to protrude from the outer surface of the center drill 32. It is configured to rotate downward, protrude from the outer surface of the center drill 32, and hook to the inner surface of the segment 10 (see FIG. 3). The fall prevention piece 34 is also similar to this.

When the water pipe 1 is to be cut by a full cut, the work valve 26 is opened to allow the internal space of the housing 2 and the internal space of the closed case 27 to communicate with each other, and then the drilling machine 3 is lowered. Then, the water pipe 1 is fully cut by a drilling machine 3 in a case 2 surrounding the water pipe 1 in a sealed state (cutting step). At this time, the hole saw 31 and the center drill 32 enter the inside of the housing 2 through the branch portion 24, and the hole saw 31 cuts off the water pipe 1 in the pipe axial direction. Also, the center drill 32 penetrates the short tubular piece 10 housed inside the hole saw 31 , and the drop-off prevention pieces 33 and 34 enter the inside of the piece 10 . After the cutting process, the perforator 3 is pulled up, and the section 10 produced by the full-cut cutting is hooked by the perforator 3 and collected (recovery process).

Immediately after the water pipe 1 is cut off by full cut cutting, the piece 10 falls and is caught on the drop-off preventing piece 33 or the drop-off preventing piece 34.例文帳に追加As described above, if the piece 10 comes into contact with the bottom inner surface 2f of the housing 2, the inner coating of the housing 2 may be damaged. Especially when the water pipe 1 is a steel pipe, it is necessary to lower the center drill 32 to such an extent that the burrs generated on the inner surface of the segment 10 do not interfere with the drop-off prevention piece 33. there were. As a solution to this problem, it is conceivable to prepare a drill exclusively for steel pipes with an adjusted position of a drop-off prevention piece, but this is not desirable from an economic point of view.

Therefore, in the present embodiment, as shown in FIG. 3, in the cutting process, the dropping of the piece 10 is regulated by the drop regulating member 4 arranged between the piece 10 and the bottom inner surface 2f of the housing 2. FIG. As a result, the piece 10 does not come into contact with the bottom inner surface 2f of the housing 2, and damage to the bottom inner surface 2f by the piece 10 can be prevented. As a result, there is no need to secure a large distance (see distance D3 in FIG. 10) from the cut piece 10 to the bottom inner surface 2f when hooked by the drop-off prevention piece 34, and the housing 2 (lower member 22) can be made compact. can be configured. In addition, since the center drill 32 can be lowered to such an extent that the drop-off prevention piece 33 does not interfere with the burr, there is no need to prepare a drill dedicated to steel pipes, and it is possible to use a drill for cast iron pipes as well. .

In this first embodiment, the fall regulating member 4 is arranged inside the housing 2 via a hole (discharging hole 23) provided in the bottom 2B of the housing 2, and is disposed from the bottom inner surface 2f of the housing 2. The segment 10 is supported from below in a posture protruding toward the water pipe 1. - 特許庁In FIG. 3, the tip of the drop-regulating member 4 is in contact with the piece 10, and even if either the drop-off prevention piece 33 or the drop-off prevention piece 34 is caught by the piece 10, the piece 10 still falls from this state. never. The fall control member 4 is made of a highly rigid material such as metal. The fall control member 4 is composed of a pair of bars. The tip portion of the drop restricting member 4 is arranged above the lower end portion of the center drill 32 .

The fall control member 4 is provided in a fall control device 40 shown in FIG. The fall control device 40 includes a fall control member 4 , an operation member 41 for operating the fall control member 4 , and a sealing member 42 for sealing the discharge hole 23 . A pair of operation members 41 are provided in correspondence with the rod member constituting the fall control member 4 , and each of the operation members 41 is configured to be rotatable about a shaft 43 . The relative positions of the drop regulating member 4 and the operating member 41 are fixed, and by rotating the operating member 41 around the shaft 43, the drop regulating member 4 moves between the first posture and the second posture. Attitude change is performed. The fall control device 40 is attached to the bottom portion 2B of the housing 2 in advance before the water pipe 1 is cut. As shown in FIGS. 3 and 5, the operating member 41 is arranged outside the housing 2, and the sealing member 42 is fitted into the discharge hole 23 instead of the plug 23a.

The drop restricting member 4 has a first end portion arranged inside the projection area 23s in the axial direction of the discharge hole 23 according to an operation from the outside (specifically, according to an operation of the operation member 41). and a second posture in which the tip portion is arranged outside the projection area 23s, and the tip portion of the drop-regulating member 4 in the second posture hits the piece 10. It is configured to support the section 10 from below by contacting it. The projection area 23 s is an area having the cross-sectional area of the discharge hole 23 and extending in the axial direction of the discharge hole 23 . The first posture is useful when the drop regulating member 4 is taken in and out of the housing 2 .

In this embodiment, the drop restricting member 4 is arranged inside the housing 2 using the discharge hole 23 for discharging chips. Therefore, it is not necessary to drill holes in the housing 2 for the fall control member 4 . However, since the tip of the drop-regulating member 4 arranged inside the housing 2 via the discharge hole 23 is arranged at the central portion of the housing 2 , there is a risk of interference with the center drill 32 . Therefore, after being arranged inside the housing 2, the position of the fall-regulating member 4 is changed to the second position, and its tip portion is arranged outside the projection area 23s. As a result, the cut piece 10 can be supported from below without causing the tip of the fall control member 4 to interfere with (the center drill 32 of) the drill 3 during cutting. In the cutting process, if necessary, the plug 23b is removed to temporarily open the discharge hole 23, and chips generated by cutting are discharged to the outside.

In the collecting process, the drilling machine 3 is raised until the hole saw 31 and the center drill 32 are positioned outside the housing 2, and the work valve 26 is closed. The section 10 is pulled up and collected while being hooked on the drop-off preventing piece 33 or the drop-off preventing piece 34 . The fall control member 4 does not interfere with the drilling machine 3 not only in the cutting process but also in the recovering process. After the drilling machine 3 is removed, the closed case 27 in which the valve device 5 is arranged is connected to the working valve 26 . The valve device 5 is pushed down by an operation rod (not shown) and inserted into the cut portion of the water pipe 1 through the branch portion 24 as shown in FIG. Thus, in this embodiment, the valve device 5 as an insert is inserted into the cut portion of the water pipe 1 after the recovery step (insertion step).

The valve device 5 is configured as a sluice valve incorporating a valve body (not shown). In FIG. 5, the valve device 5 is shown in outline, and detailed description of its appearance and cross section is omitted. The valve device 5 includes an inner hollow portion 51 provided at a stop portion of the outer surface of the bottom portion and opening downward, and a sealing material 52 (packing) attached to the outer surface of the bottom portion. As shown in FIG. 5, in the present embodiment, the tip portion of the fall regulating member 4 in the first posture is accommodated in the hollow portion 51 of the valve device 5 inserted into the cut portion. Therefore, in the insertion step, the valve device 5 can be smoothly inserted without causing the drop-regulating member 4 to interfere with the valve device 5 by keeping the drop-regulating member 4 in the first posture.

In addition, in this embodiment, the space between the bottom outer surface of the valve device 5 inserted in the insertion step and the bottom inner surface 2f of the housing 2 is sealed with the sealing material 52, so that the fluid (that is, water) flowing through the water pipe 1 is After making the hole (discharge hole 23) out of reach, the fall control member 4 is removed from the housing 2. - 特許庁As a result, the fall control member 4 can be safely removed from the housing 2, and the fall control device 40 can be easily removed. After removing the fall control member 4, a plug 23a (see FIGS. 1 and 2) is attached to close the discharge hole 23. As shown in FIG.

[Second embodiment]
The second embodiment is a modification of the fall control member (or the fall control device) of the first embodiment. The second embodiment can be configured in the same manner as the first embodiment except for the configuration described below, so common points will be omitted and differences will be mainly described. The same reference numerals are assigned to the same members as those described in the first embodiment, and redundant description is omitted.

In the second embodiment, as shown in FIG. 6, in the cutting process, the fall control member 6 arranged between the piece 10 and the bottom inner surface 2f of the housing 2 regulates the piece 10 from falling. The fall regulating member 6 is arranged inside the housing 2 via a hole 28 provided in the bottom 2B of the housing 2, and protrudes toward the water pipe 1 from the inner surface 2f of the bottom of the housing 2. 10 is supported from below. The fall control member 6 is made of a highly rigid material such as metal. The fall control member 6 is composed of a pair of bars. The tip of the drop restricting member 6 is arranged above the lower end of the center drill 32 . In the present embodiment, the piece 10 is supported at a position where the distance D4 is dropped after cutting, but the piece 10 may be supported so that the distance D4 becomes zero, that is, without dropping the piece 10 (this point is The same applies to the first embodiment).

The fall control member 6 is provided in the fall control device 60 . The fall control device 60 includes a fall control member 6, an operation member 61 for operating the fall control member 6, and a socket member 62 for holding them. The drop restricting member 6 is connected to the tip of the operating member 61 . The operating member 61 is formed of a bolt and screwed into the socket member 62 . The socket member 62 is attached to the bottom portion 2B of the housing 2 by screwing, for example, so that the drop regulating member 6 is inserted through the hole 28 . An O-ring is attached to the bottom portion 2B or the socket member 62 so as to maintain watertightness. A pair of fall control devices 60 are provided corresponding to the holes 28 .

The fall control member 6 can adjust the amount of protrusion from the bottom inner surface 2f according to the operation from the outside (specifically, according to the operation of the operation member 61). It is configured to support the section 10 from below by contacting it. In this embodiment, the drop regulating member 6 is between a non-protruding state (see FIG. 7) in which it does not protrude from the bottom inner surface of the housing 2 and a protruding state (see FIG. 6) in which it protrudes from the bottom inner surface 2f of the housing 2. , and the tip portion of the drop regulating member 6 in the projecting state is brought into contact with the piece 10 . The drop regulating members 6 are inclined with respect to the axial direction of the center drill 32, and support the piece 10 as a pair from both left and right sides in FIG. The length and angle of the drop restricting member 6 and the position of the hole 28 are set so that the tip of the drop restricting member 6 does not interfere with the center drill 32 .

In the insertion step, the valve device 5 is prevented from falling by appropriately reducing the protrusion amount of the drop-regulating member 6, more preferably by keeping the drop-regulating member 6 in a non-projecting state as shown in FIG. The valve device 5 can be smoothly inserted without causing the member 6 to interfere. After sealing the space between the bottom outer surface of the valve device 5 inserted in the insertion step and the bottom inner surface 2f of the housing 2 with a sealing material 52 to prevent the fluid flowing through the water pipe 1 from reaching the hole 28, Remove the fall control member 6 from the housing 2 . As a result, the fall control member 6 can be safely removed from the housing 2, and the fall control device 60 can be easily removed. After removing the drop regulating member 6, a cap (not shown) is attached to close the hole 28. As shown in FIG.

[Third Embodiment]
The third embodiment is a modification of the fall control member in the first embodiment. The third embodiment can be configured in the same manner as the first embodiment except for the configuration described below, so common points will be omitted and differences will be mainly described. The same reference numerals are assigned to the same members as those described in the first embodiment, and redundant description is omitted.

In the third embodiment, as shown in FIG. 8, the fall control member 7 is formed of a cushion material 70 attached to the water pipe 1 so as to be arranged between the piece 10 and the bottom inner surface 2f of the housing 2. It is The cushion material 70 is made of an elastic material such as rubber so as not to damage the bottom inner surface 2f. The fall control member 7 is attached to the water pipe 1 in advance before the housing 2 hermetically surrounds the water pipe 1 . The fall regulating member 7 is configured to be mounted by winding it around the water pipe 1 via a mounting member 71 extending along the circumferential direction of the water pipe 1 . In the drawing, the drop regulating member 7 and the mounting member 71 are drawn in color.

In the cutting step, as shown in FIG. 9 , the piece 10 is regulated from falling by the drop regulating member 7 arranged between the piece 10 and the bottom inner surface 2f of the housing 2 . By thus preventing contact of the piece 10 with the bottom inner surface 2f, damage to the bottom inner surface 2f can be prevented. Unlike the first and second embodiments, this embodiment does not require any operation below the housing 2 . In the recovery step after the cutting step, the punch 3 is pulled up, and the segment 10 produced by the full-cut cutting is hooked by the punch 3 and recovered. At that time, the drop regulating member 7 is recovered together with the piece 10 . The inserting step can be performed conventionally.

The present invention is by no means limited to the first to third embodiments described above, and various modifications and improvements are possible without departing from the scope of the present invention.

In the above-described embodiment, an example was shown in which the piece 10 is collected by hooking it on the drop-off prevention pieces 33, 34 provided on the center drill 32 of the drilling machine 3, but the present invention is not limited to this. Even when the section is collected by a method other than the fall-off prevention piece, the above-described advantageous effect can be obtained by preventing the section from falling and damaging the bottom inner surface of the housing.

In the above-described embodiment, an example in which the valve device 5 is configured as a sluice valve has been shown, but it is not limited to this, and may be configured as a switching valve capable of switching flow paths, for example. Further, the insert is not limited to the valve device, and may be, for example, a shielding device that shields the flow path.

INDUSTRIAL APPLICABILITY The present invention can be applied to water pipes, but is not limited to this, and can be widely applied to fluid pipes used for fluids such as various liquids and gases other than water.

1 Water pipe (an example of a fluid pipe)
2 Housing 2B Bottom 2f Bottom inner surface 3 Boring machine 4 Fall control member 5 Valve device (an example of an insert)
6 Fall regulating member 7 Fall regulating member 10 Cut piece 23 Discharge hole 23s Projection area 28 Hole 31 Hole saw 32 Center drill 33 Drop prevention piece 34 Drop prevention piece 52 Seal material 70 Cushion material

Claims (10)

Inside a housing that hermetically surrounds the fluid pipe, the hole saw of a drilling machine comprising a cylindrical hole saw and a center drill positioned at the center of its axis fully cuts the fluid pipe in an uninterrupted state and cuts the fluid pipe. a cutting step of penetrating the center drill through a section produced by full-cut cutting;
After the cutting step, the piercing machine is pulled up, and a recovery step of hooking the inner surface of the section generated by full-cut cutting with a drop-off prevention piece provided on the center drill to recover the section,
In the cutting step, a fall control member disposed between the piece and the bottom inner surface of the housing regulates the piece from falling ,
The fall regulating member is arranged inside the housing through a hole provided in the bottom of the housing, and is arranged so as to protrude from the inner surface of the bottom of the housing toward the fluid pipe. A method for full-cut cutting of a fluid tube that supports . the hole is a discharge hole provided in a central portion of the bottom of the housing,
The drop regulating member has a first posture in which the tip portion is arranged inside a projected area in the axial direction of the discharge hole, and a tip portion is arranged outside the projected area in accordance with an operation from the outside. A posture change is possible between the second posture and
2. The full-cut cutting method for a fluid pipe according to claim 1 , wherein said piece is supported from below by bringing the tip of said fall regulating member in said second posture into contact with said piece. the fall regulating member is capable of adjusting the amount of protrusion from the inner surface of the bottom portion of the housing according to an operation from the outside;
2. The full-cut cutting method for a fluid pipe according to claim 1 , wherein said piece is supported from below by bringing the tip of said fall control member into contact with said piece. After the recovering step, an inserting step of inserting an insert into the cut portion of the fluid tube,
After sealing the space between the outer bottom surface of the insert inserted in the inserting step and the inner bottom surface of the housing with a sealing material to prevent the fluid flowing through the fluid pipe from reaching the hole, A full-cut cutting method for a fluid pipe according to any one of claims 1 to 3 , wherein the drop regulating member is removed from the body. Inside a housing that hermetically surrounds the fluid pipe, the hole saw of a drilling machine comprising a cylindrical hole saw and a center drill positioned at the center of its axis fully cuts the fluid pipe in an uninterrupted state and cuts the fluid pipe. a cutting step of penetrating the center drill through a section produced by full-cut cutting;
After the cutting step, the piercing machine is pulled up, and a recovery step of hooking the inner surface of the section generated by full-cut cutting with a drop-off prevention piece provided on the center drill to recover the section,
In the cutting step, a fall control member disposed between the piece and the bottom inner surface of the housing regulates the piece from falling,
the fall control member is formed of a cushioning material attached to the fluid pipe so as to be disposed between the piece and the bottom inner surface of the housing;
The fall control member is mounted by winding it around the fluid pipe via a mounting member extending along the circumferential direction of the fluid pipe,
The fall control member is attached to the fluid pipe in advance before sealingly surrounding the fluid pipe with the housing,
In the recovering step, the fluid pipe full-cut cutting method recovers the drop regulating member together with the piece. a housing sealingly surrounding the fluid conduit;
Equipped with a cylindrical hole saw and a center drill positioned at the center of its axis, the hole saw fully cuts the fluid pipe inside the housing, and the center drill penetrates a segment generated by the full cut, a drilling machine configured to be able to recover the section by hooking a drop-off prevention piece provided on the center drill on the inner surface of the section;
a drop regulating member disposed between a piece produced by full-cut cutting and the bottom inner surface of the housing and configured to regulate the fall of the piece ,
The fall regulating member is arranged inside the housing through a hole provided in the bottom of the housing, and is arranged to project from the inner surface of the bottom of the housing toward the fluid pipe. A fluid line full cut disconnect device configured to support . the hole is a discharge hole provided in a central portion of the bottom of the housing,
The drop regulating member has a first posture in which the tip portion is arranged inside a projected area in the axial direction of the discharge hole, and a tip portion is arranged outside the projected area in accordance with an operation from the outside. A posture change is possible between the second posture and
7. The full-cut cutting device for a fluid pipe according to claim 6 , wherein said piece is supported from below by bringing the tip of said drop regulating member in said second posture into contact with said piece. . the fall regulating member is capable of adjusting the amount of protrusion from the inner surface of the bottom portion of the housing according to an operation from the outside;
7. The full-cut cutting device for a fluid pipe according to claim 6 , wherein said piece is supported from below by bringing the tip of said drop regulating member into contact with said piece. a housing sealingly surrounding the fluid conduit;
Equipped with a cylindrical hole saw and a center drill positioned at the center of its axis, the hole saw fully cuts the fluid pipe inside the housing, and the center drill penetrates a segment generated by the full cut, a drilling machine configured to be able to recover the section by hooking a drop-off prevention piece provided on the center drill on the inner surface of the section;
a drop regulating member disposed between a piece produced by full-cut cutting and the bottom inner surface of the housing and configured to regulate the fall of the piece,
the fall control member is formed of a cushioning material that can be attached to the fluid pipe so as to be arranged between the cut piece and the bottom inner surface of the housing;
The fall regulating member can be pre-wound and attached to the fluid pipe via an attachment member extending along the circumferential direction of the fluid pipe, before the housing hermetically encloses the fluid pipe. , a full-cut cutting device for fluid pipes. 10. The full-cut cutting of the fluid pipe according to claim 9 , wherein the drop regulating member is configured to be mounted by winding it around the fluid pipe via a mounting member extending along the circumferential direction of the fluid pipe. Device.

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