JP2009045688A - Wall surface processing device for buried pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wall surface processing device for a buried pipe easily fixable to the inner surface of a pipe even if the pipe is buried in a ground. <P>SOLUTION: This device for processing a buried P from the inner side comprises a processing means 30 for cutting the inner surface of the pipe P and a fixing means 10 for fixing the processing means 30 inside the pipe. The fixing means 10 comprises a radially enlargeable/contractable member 11 formed in a generally cylindrical shape, and a plurality of leg parts 18 erected on the side surfaces of a fixing part for fixing the radially enlargeable/contractable member 11 in an enlarged state and the radially enlargeable/contractable member 11. When the radially enlargeable/contractable member 11 is enlarged, the leg parts 18 are pressed against the inner surface of the pipe P. When the radially enlargeable/contractable member 11 is fixed by the fixing means 10 in an enlarged state, the device is fixed to the inner surface of the pipe P. When the device is fixed to the inner surface of the pipe P by the fixing means 10, the inner surface of the pipe P can be stably processed by the processing means 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an embedded pipe wall surface processing apparatus. More specifically, the present invention relates to an embedded pipe wall surface processing apparatus capable of processing such as forming a groove on an inner surface of a pipe or cutting a wall of the pipe.

  Pipes buried in the ground are used for sewers, tunnel drains, etc., and are connected to a manhole installed vertically. Such pipes such as sewers are cracked or broken when an impact is applied due to, for example, an earthquake or the like, and therefore, work for replacing damaged pipes may be performed. Since this exchanging work requires excavation of the ground and excavation of piping, the work period is prolonged, and during that time, there is a problem that the surroundings of the excavation site must be regulated to ensure safety.

Therefore, various methods have been developed for repairing a pipe from the inside when the pipe buried in the ground is damaged, and one of them is a snap lock method (Non-patent Document 1).
As shown in FIG. 7, the snap lock method is a method in which a rubber sleeve G and a metal sleeve S are attached to the inner surface of a damaged part such as a crack in a pipe, and the metal sleeve is sandwiched between the rubber sleeves G. By attaching the outer peripheral surface of S to the inner surface of the pipe P, water leakage from cracks and the like can be prevented.

In addition, a method (magma lock method) that uses the snap lock method for earthquake resistance of the pipe P has been developed (Non-patent Document 1). For the pipe P buried in the ground, a high-strength fume pipe is usually adopted, but in the magma lock method, a part having a weak strength obtained by cutting a reinforcing bar is provided in a part near the manhole in the fume pipe, A metallic sleeve S and a rubber sleeve G are attached to this weak portion in the same manner as in the snap lock method.
With such a structure, even if a force such as an earthquake is applied to the pipe P, a force such as an earthquake is concentrated on the portion where the metallic sleeve S having a lower strength than the reinforcing bar is provided. Then, since the part provided with the metallic sleeve S is damaged and absorbs a force such as an earthquake, the other part can be prevented from being damaged. And even if a crack etc. generate | occur | produce in the part which has provided the metallic sleeve S etc., water leakage can be prevented by the metallic sleeve S etc.

As an example of an apparatus for accurately forming a groove along the inner surface of a pipe, there is an apparatus disclosed in Patent Document 1.
The apparatus described in Patent Document 1 includes a shaft disposed so as to be coaxial with the central axis of the pipe, and an air grinder attached to the shaft so as to rotate around the central axis of the shaft. The groove can be formed along the inner surface of the pipe by rotating the air grinder.

However, the snap lock method and the magma lock method are used not only for pipes to be buried in the ground, but also for repairing pipes already buried in the ground and improving earthquake resistance. Since existing buried pipes usually do not have grooves formed on the inner surface, the grooves must be formed while the pipes are buried.
However, the apparatus of Patent Document 1 employs a configuration in which a frame that supports the air grinder is fixed to a flange formed on the end surface of the pipe. However, in a pipe that is buried in the ground, the frame is attached to the flange. It is difficult. Then, although the apparatus of patent document 1 can be used for the operation | work which forms a groove | channel with respect to the piping before being embed | buried under the ground, it is used for the operation | work which forms a groove | channel later on the piping already embed | buried under the ground. It is difficult to do.

JP-A-60-161013 Japan Snaplock Association homepage, [April 9, 2007 search] <URL: http://www.snap-lock.jp/menu_frame.html>

  In view of the above circumstances, an object of the present invention is to provide an embedded pipe wall surface processing apparatus that can easily fix an apparatus to the inner surface of a pipe even if the pipe is buried in the ground.

The buried pipe wall surface processing apparatus according to the first aspect of the invention is an apparatus for processing an embedded pipe from the inside, a processing means for processing the inner surface of the pipe, and a fixing means for fixing the processing means in the pipe. The fixing means is formed in a substantially cylindrical shape, a radially expanding / contracting member that can be expanded / contracted along the radial direction, and a fixing portion that fixes the radially expanding / contracting member in an expanded state. And a plurality of legs standing on the side surface of the radially expanding / contracting member.
According to a second aspect of the present invention, there is provided the buried pipe wall surface processing apparatus according to the first aspect, wherein the radially expanding / contracting member has a plurality of moving blocks arranged side by side around a central axis thereof, and is surrounded by the plurality of moving blocks. An expansion / contraction member in which a substantially conical insertion space that is coaxial with the central axis of the radial expansion / contraction member is formed in the portion, and a plurality of moving blocks in the expansion / contraction member are arranged in the circumferential direction of the radial expansion / contraction member. And a holding member that holds the radial expansion / contraction member in a state in which the radial expansion / contraction member can be moved in the radial direction. The insertion space of the expansion / contraction member has a small cross section from the other end toward one end. The fixing portion has a substantially conical shape, and when inserted into the insertion space from the other end of the expansion / contraction member, the plurality of members extend along the radial direction of the radial expansion / contraction member. Move the same length An insertion member formed in a shape that is characterized by comprising a mobile fixing member for fixing the movement of the insert member which is inserted into the insertion space of the scaling member.
The wall surface processing apparatus for an embedded pipe according to a third aspect of the present invention is the first aspect, wherein the holding member fixes a plurality of moving blocks of the expansion / contraction member, and fixes relative movements between ends in the axial direction, and The moving block is configured to hold the movable block so as to be able to swing in the radial direction with one end in the axial direction as a fulcrum.
A buried pipe wall surface processing apparatus according to a fourth aspect of the present invention is the first, second or third aspect of the invention, further comprising a moving means for moving the processing means relative to the fixing means, wherein the moving means is the processing means. Is moved in the circumferential direction around the central axis of the radially expanding / contracting member.
According to a fifth aspect of the present invention, there is provided the buried pipe wall surface processing apparatus according to the fourth aspect, wherein the processing means includes a disk-shaped cutting blade, and the moving means uses the rotation axis of the cutting blade as the radial expansion / contraction member. The processing means is moved in the circumferential direction while being kept parallel to the central axis of the head.
According to a sixth aspect of the present invention, in the fourth or fifth aspect of the invention, the moving means can be attached to and detached from the rotating shaft provided in the processing means and the rotating shaft provided in the fixing means. The bearing portion is configured to hold the shaft so that the central axis thereof is coaxial with the central axis of the radial expansion / contraction member.

According to the first aspect of the present invention, the plurality of legs can be pressed against the inner surface of the pipe by increasing the diameter of the radial expansion / contraction member. Therefore, the apparatus can be fixed to the inner surface of the pipe if the radial expansion / contraction member is fixed in an expanded state by the fixing means. If the device is fixed to the inner surface of the pipe by the fixing means, the inner surface of the pipe can be processed in a stable state by the processing means.
According to the second invention, the plurality of moving blocks are held by the holding member so as to be movable only in the radial direction of the radial expansion / contraction member, and the insertion space has a substantially conical shape whose cross section decreases from the other end toward the one end. It is formed in a shape. Therefore, if the insertion member is inserted into the insertion space from the other end of the expansion / contraction member and the movement of the insertion member is fixed by the movable fixing member, the expansion / contraction member can be fixed in an enlarged state. Fixing can be performed easily.
According to the third aspect of the present invention, if the plurality of moving blocks of the expansion / contraction member swing in the radial direction with one axial end as a fulcrum, the plurality of legs can be pressed against the inner surface of the pipe. In addition, since the holding member only holds the plurality of moving blocks so as to swing around one end thereof, the configuration of the holding member can be simplified.
According to the fourth invention, since the processing means can be rotated around the central axis of the radial expansion / contraction member, the inner surface of the pipe can be processed along the inner surface by the processing means.
According to the fifth aspect of the invention, if the central axis of the radially expanding / contracting member and the central axis of the pipe are arranged in parallel, the disc-shaped cutting blade is arranged perpendicular to the inner surface of the pipe. Grooves can be formed. Further, by changing the radius of the cutting blade, the depth of the groove to be formed can be adjusted, and even a deep groove can be formed.
According to the sixth invention, the processing means can be attached to and detached from the fixing means by attaching and detaching the rotating shaft to and from the bearing portion. Then, since the processing means can be attached to the fixing means after the fixing means is installed in the pipe, the installation work of the apparatus in the pipe is simplified.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic front view of a state in which the wall surface processing apparatus 1 of the present embodiment is disposed in the pipe P. FIG. 2 is a schematic side view showing a state in which the wall surface processing apparatus 1 of the present embodiment is disposed in the pipe P. FIG. 3 is a schematic rear view showing a state in which the wall surface processing apparatus 1 of the present embodiment is disposed in the pipe P.

As shown in FIGS. 1-3, the wall surface processing apparatus 1 of this embodiment is arrange | positioned inside the piping P, and processes the wall surface from the inner surface of the piping P. As shown in FIG. In particular, it is an apparatus suitable for processing a pipe P having a small inner diameter (an inner diameter of about 250 to 600 mm).
In addition, the process in this specification is the process which processes the inner surface of the piping P, for example, the process which grind | polishes the inner surface of the pipe P, the process which cuts the inner surface of the piping P of an inner surface, forms a groove | channel, and complete | finishes a wall surface It is a concept that includes a process of cutting into two.
Below, the process which cuts the inner surface of the piping P and forms a groove | channel is demonstrated as a representative.

  As shown in FIGS. 1 to 3, the wall surface processing apparatus 1 of the present embodiment includes a processing means 30 for cutting the pipe P from the inner surface, a fixing means 10 for fixing the processing means 30 in the pipe P, and a processing And moving means 20 for moving the means 30 relative to the fixing means 10.

First, the fixing means 10 will be described.
4A and 4B are schematic cross-sectional views of the fixing means 10, and FIG. 4B is a view taken along the line BB in FIG. FIG. 5 is a schematic explanatory view showing a state in which the bearing unit 21 of the moving unit 20 is attached to the fixing unit 10. As shown in FIGS. 4 and 5, the fixing means 10 includes a radial expansion / contraction member 11, a fixing portion 15, and three leg portions 18.

  As shown in FIG. 4, the radial expansion / contraction member 11 of the fixing means 10 includes an expansion / contraction member 12 and a holding member 13 that holds the expansion / contraction member 12.

  The holding member 13 includes a base portion 13a to which a bearing portion 21 of the moving means 20 described later is fixed, a shaft-like portion 13b protruding from the back surface of the base portion 13a, and a flange-like connection formed at the tip of the shaft-like portion 13b. Part 13c. The connecting portion 13c is a portion to which the expansion / contraction member 12 is attached, and is formed to a thickness that can slightly swing along the axial direction with the connecting portion with the shaft-like portion 13b as a fulcrum.

As shown in FIG. 4, the expansion / contraction member 12 includes three moving blocks 12a. The three moving blocks 12a are arranged so as to be rotationally symmetrical with each other around the central axis CL of the holding member 13 (the central axis of the radial expansion / contraction member 11). The three moving blocks 12a have their axial ends (the left end in FIG. 4) connected to the connecting portion 13c of the holding member 13 so that they cannot move in the circumferential direction with respect to the central axis CL of the holding member 13. It is fixed.
The three moving blocks 12a are formed with an insertion space forming portion 12b having a circular arc cross section so as to surround the central axis CL of the holding member 13. The insertion space forming portion 12b is formed such that the distance between the inner surface of the moving block 12a and the central axis CL of the holding member 13 increases from the distal end to the proximal end of each moving block 12a. Moreover, the insertion space forming portions 12b of the three moving blocks 12a are formed so as to be rotationally symmetric with respect to the central axis CL of the holding member 13.
Therefore, in a state where the three moving blocks 12 are fixed to the holding member 13, a substantially conical insertion space 12 h coaxial with the central axis CL of the holding member 13 is formed in a portion surrounded by the three moving blocks 12. It is.

  In the above example, the case where the expansion / contraction member 12 of the radial expansion / contraction member 11 includes three moving blocks 12a is illustrated, but the number of the moving blocks 12a provided is not particularly limited.

As shown in FIG. 5, the holding member 13 is formed with a through hole 13h that passes through the axial direction thereof and communicates with the insertion space 12h. A fixing bolt 16 for the fixing portion 15 is disposed in the through hole 13 h of the holding member 13. The fixing bolt 16 is inserted from the base portion 13a side of the holding member 13 so that the tip end portion thereof is positioned in the insertion space 12h of the expansion / contraction member 12.
A frustoconical insertion member 17 is screwed into the distal end portion of the fixing bolt 16. The insertion member 17 is formed so that the central axis thereof is coaxial with the expansion / contraction member 12 in a state where the insertion member 17 is screwed to the tip of the fixing bolt 16. The insertion member 17 is formed such that the inclination of the side surface with respect to the central axis is substantially the same as the inclination of the inner surface of the insertion space forming portion 12b of the moving block 12a with respect to the central axis CL of the holding member 13. In addition, the radius R1 of the base end (left end in FIG. 5) of the insertion member 17 is formed to be larger than the radius R2 of the base end of the insertion space 12h.

  Therefore, if the insertion member 17 is screwed toward the base end (left end in FIG. 5) of the fixing bolt 16, the insertion member 17 can be inserted into the insertion space 12h like a wedge. Then, since the three moving blocks 12a are pushed in the radial direction by the insertion member 17, the connecting portion 13c bends toward the base portion 13a in response to the force applied to the three moving blocks 12a. That is, since the three moving blocks 12a move so that their base end portions are separated from each other in the radial direction, the outer diameter of the expanding / contracting member 12 can be increased. And if the movement of the insertion member 17 is stopped and the movement is fixed, the expansion / contraction member 12 can be fixed in an expanded state.

  Moreover, the insertion space 12h is a substantially conical space coaxial with the central axis CL of the holding member 13, and the insertion member 17 is a member formed in a truncated conical shape coaxial with the central axis CL of the holding member 13. Therefore, when the insertion member 17 is inserted, all the movement amounts of the three movement blocks 12a can be made the same movement amount.

The fixing bolt 16 is a movable fixing member as defined in the claims.
Furthermore, since the insertion member 17 is screwed into the fixing bolt 16, it is possible to fix the movement of the insertion member 17 only by stopping the rotation of the insertion member 17. However, if the nut or the like is screwed into the fixing bolt 16 and disposed at a position in contact with the proximal end of the insertion member 17, the movement of the insertion member 17 can be fixed more reliably.

As shown in FIGS. 4 and 5, rod-like legs 18 are provided upright on the outer surfaces of the three moving blocks 12 a of the expansion / contraction member 12. The three leg portions 18 are formed so that they can be expanded and contracted along the axial direction and can be fixed at a desired length. A contact plate 19 formed in a plate shape or a cylindrical shape is provided at the distal end portion of each leg portion 18.
Further, the three leg portions 18 are provided so that the central axis of each leg portion 18 is located on the same plane perpendicular to the central axis of the expansion / contraction member 12 in a state where the expansion / contraction member 12 has a reduced diameter. In addition, the three leg portions 18 are arranged at equal angular intervals around the central axis of the expansion / contraction member 12.

Since the configuration is as described above, the fixing means 10 is disposed in the pipe P, and the lengths of the three leg portions 18 are adjusted so that the contact plates 19 of the three leg portions 18 are in contact with the inner surface of the pipe P. In this state, the insertion member 17 enters the insertion space 12h like a wedge. Then, the expansion / contraction member 12 expands and the contact plates 19 of the three leg portions 18 are pressed toward the inner surface of the pipe P, so that the fixing means 10 can be fixed in the pipe P.
Further, since the movement amounts of the three movement blocks 12a are all the same, the reaction forces applied from the inner surface of the pipe P to the respective leg portions 18 are all the same. In addition, the legs 18 are arranged at equiangular intervals around the central axis of the expansion / contraction member 12. Therefore, the reaction force applied from the inner surface of the pipe P to each leg portion 18 is substantially balanced by the expansion / contraction member 12, so that the fixing means 10 can be installed in the pipe P in a stable state.

  The configuration of the leg portion 18 is not particularly limited as long as it can be adjusted and fixed to a desired length. As an example, a base end member 18a having a base end attached to the moving block 12a, and the base end member 18a. The leg portion 18 can be constituted by the distal end member 18b to which the base end is attached. In such a configuration, a female screw is formed at the distal end of the base end member 18a, and a male screw is formed at the proximal end of the distal end member 18b. Then, the length of the leg portion 18 can be expanded and contracted by screwing and screwing the distal end member 18b with respect to the proximal end member 18a. Further, if a nut or the like is screwed onto the male screw of the distal end member 18b, the movement of the distal end member 18b relative to the proximal end member 18a can be fixed by the nut or the like, so the leg portion 18 is securely fixed at a predetermined length. be able to.

Next, the moving means 20 will be described.
As shown in FIG. 5, a bearing portion 21 of the moving means 20 is fixed to the base portion 13 a of the holding member 13. The bearing portion 21 is fixed to the base portion 13 a of the holding member 13 so that the central axis thereof is coaxial with the central axis of the expansion / contraction member 12 of the fixing means 10. A motor 24 is provided on the outer surface of the bearing portion 21 so that the main shaft is parallel to the central axis of the bearing portion 21. A gear 24 a is attached to the main shaft of the motor 24.

As shown in FIG. 2, a through hole 21 h is formed in the bearing portion 21 along the central axis, and one end portion of the rotating shaft 22 is inserted.
The rotating shaft 22 has a processing means 30 to be described later attached to the other end. The rotating shaft 22 is provided with a gear 23 between the processing means 30 and one end thereof. The gear 23 is provided such that its center is located on the central axis of the rotating shaft 22. In addition, the gear 23 is disposed at a position that meshes with the gear 24 a in a state where the rotary shaft 22 is inserted into the through hole 21 h of the bearing portion 21.

  For this reason, if the rotary shaft 22 is inserted into the through hole 21h of the bearing portion 21 and attached, the gear 24a and the gear 23 mesh with each other. Therefore, when the motor 24 is operated, the motor 24 is connected via the gear 24a and the gear 23. The rotational force can be transmitted to the rotary shaft 22. Then, since the rotating shaft 22 rotates around its central axis, the processing means 30 attached to the other end of the rotating shaft 22 can be rotated around the central axis of the rotating shaft 22. In other words, the processing means 30 can be rotated around the central axis of the pipe P.

Moreover, the rotating shaft 22 has a reduced diameter portion 22s that is recessed from the side surface and reduced in diameter at one end thereof. The reduced diameter portion 22 s is formed in a groove shape along the side surface of the rotating shaft 22.
On the other hand, a recess 21s is formed on the inner surface of the through hole 21h of the bearing portion 21 so as to be recessed from the inner surface. The recessed portion 21s is formed at a position facing the reduced diameter portion 22s of the rotating shaft 22 when the rotating shaft 22 is inserted into the through hole 21h. In the recess 21s, a fixed piece 26 provided so as to be able to protrude from the inner surface of the through hole 21h of the bearing portion 21 is disposed. The fixed piece 26 is formed so that its thickness is shorter than the depth of the recess 21s but longer than the depth of the reduced diameter portion 22s.
For this reason, when the fixed piece 26 is protruded from the inner surface of the through hole 21h with the rotary shaft 22 inserted into the through hole 21h of the bearing portion 21, the tip of the fixed piece 26 enters the reduced diameter portion 22s of the rotary shaft 22. Can be arranged. Then, since the fixed piece 26 functions like a key, the relative movement of the rotary shaft 22 with respect to the bearing portion 21 can be fixed in the axial direction of the bearing portion 21. In addition, since the reduced diameter portion 22s of the rotating shaft 22 is formed in a groove shape along the side surface of the rotating shaft 22, the fixed piece 26 does not interfere with the rotation of the rotating shaft 22.
On the contrary, if the fixed piece 26 is accommodated in the reduced diameter portion 22s, the rotary shaft 22 can be moved along the axial direction with respect to the bearing portion 21. It can be detached from the bearing portion 21.

As a specific configuration for causing the fixed piece 26 to appear and disappear, for example, the following configuration can be adopted.
A female screw hole is formed in the outer surface of the fixed piece 26, and a screw member 27 inserted into the concave portion 21s from the side surface of the bearing portion 21 is screwed into the female screw hole. Then, if the screw member 27 is rotated, the fixed piece 26 can be moved back and forth along the axial direction of the screw member 27, so that the fixed piece 26 can be moved in and out.
In particular, if a spring is provided between the outer surface of the fixed piece 26 and the inner surface of the recess 21 s, the fixed piece 26 can be constantly biased toward the rotating shaft 22. Then, since the possibility that the fixed piece 26 is detached from the reduced diameter portion 22s can be reduced, the relative movement between the bearing portion 21 and the rotary shaft 22 can be fixed in a more stable state.

Next, the processing means 30 will be described.
As shown in FIG. 2, a slide base 33 is fixed to the other end of the rotary shaft 22. The slide base 33 is a member formed in a cylindrical shape, and is disposed so that the axial direction thereof is orthogonal to the rotation shaft 22. An opening is formed in the side surface (left surface in FIG. 2) of the slide base 33 along the axial direction.

FIG. 6 is a schematic explanatory diagram of the processing means 30 alone. As shown in FIG. 6, a screw shaft 33 a extending along the axial direction of the slide base 33 and a moving part 36 a of the case 36 movable along the axial direction of the slide base 33 are arranged inside the slide base 33. It is installed. The moving part 36a is fixed with a nut 35a screwed to the screw shaft 33a.
Therefore, if the screw shaft 33a is rotated, the nut 35a can be moved in the axial direction of the screw shaft 33a, and the moving portion 36a can be moved along the axial direction of the slide base 33 together with the nut 35a.
The method for rotating the screw shaft 33a is not particularly limited. For example, if a nut is attached to one end of the screw shaft 33a, the screw shaft 33a can be rotated by rotating the nut with a known ratchet handle or the like. .

As shown in FIGS. 2 and 6, the chain case portion 36b is fixed to the side surface (the left side surface in FIG. 2 and the upper surface in FIG. 6) of the moving portion 36a of the case 36 through the opening of the slide base 33. Yes. The chain case portion 36b is provided so as to be movable along the axial direction with respect to the slide base 33 together with the moving portion 36a.
Driving means 37 such as a hydraulic motor is provided on the side surface of the chain case portion 36b (the left surface in FIG. 2 and the upper surface in FIG. 6). The driving means 37 is arranged so that its main axis is parallel to the central axis of the rotating shaft 22. Moreover, the tip of the main shaft of the driving means 37 protrudes into the chain case portion 36b, and a sprocket 37a is attached to this tip.

Further, as shown in FIG. 6, a driven shaft 38 is disposed on the distal end side (right side in FIG. 6) from the driving means 37 so as to be parallel to the main axis of the driving means 37. In other words, the driven shaft 38 is disposed so as to be parallel to the rotation shaft 22.
The driven shaft 38 is arranged so that one end is located outside the chain case portion 36b and the other end is located in the chain case portion 36b. A disc-shaped cutting blade 39 is attached to one end of the driven shaft 38 so that the rotation surface is orthogonal to the driven shaft 38. On the other hand, a sprocket 38a is fixed to the other end of the driven shaft 38, and a chain 37b is wound between the sprocket 38a and the sprocket 37a.

For this reason, when the driving means 37 is driven, the driven shaft 38 is rotated via the sprocket 37a, the chain 37b, and the sprocket 38a, so that the cutting blade 39 can be rotated together with the driven shaft 38. In addition, since the main shaft and the driven shaft 38 of the driving means 37 are arranged so as to be parallel to the rotary shaft 22, the cutting blade 39 can be rotated while being kept parallel to the reference plane.
Further, the axial direction of the slide base 33 is orthogonal to the rotating shaft 22, and the rotating shaft 22 and the driven shaft 38 are parallel. For this reason, if the motor 24 of the moving means 20 is driven while the driving means 37 is driven, the cutting blade 39 is revolved around the rotating shaft 22 with its rotating surface orthogonal to the rotating shaft 22. be able to.

Therefore, if the fixing means 10 is fixed to the inner surface of the pipe P so that the central axis of the expansion / contraction member 12 is coaxial with the central axis of the pipe P, the cutting blade 39 is disposed perpendicular to the inner surface of the pipe P. . Then, if the inner surface of the pipe P is cut by the cutting blade 39, a groove perpendicular to the inner surface of the pipe P can be formed.
Moreover, since the cutting blade 39 can revolve around the rotary shaft 22 while keeping the cutting blade 39 perpendicular to the inner surface of the pipe P, the cutting blade 39 is continuous along the inner surface of the pipe P and perpendicular to the inner surface of the pipe P. A groove can be formed, or the pipe P can be cut in a cross section perpendicular to the inner surface thereof.

  Although the cutting amount of the cutting blade 39 is limited according to the radius, the depth of the groove to be formed can be adjusted by changing the radius. For example, if the radius of the cutting blade 39 is increased, even a deep groove can be formed. If the groove depth is to be kept below a certain amount, the maximum cutting depth is the same as the allowable groove depth. If the cutting blade 39 is used, it is possible to prevent the cutting from becoming too deep.

  Furthermore, when the pipe P to be cut is a fume pipe having a reinforcing bar therein, it is necessary to cut the reinforcing bar not only when the cutting blade 39 cuts the pipe P but also when the cutting depth is deep. . In such a case, if a hydraulic drive motor or an electric drive motor is used as the drive means 37 and a diamond blade or the like is used for the cutting blade 39, the reinforcing bars can also be cut.

  Next, the processing operation of the inner surface of the pipe P by the wall surface processing apparatus 1 of the present embodiment will be described.

First, as shown in FIG. 5, the fixing means 10 in a state where the bearing portion 21 of the moving means 20 is attached is installed on the inner surface of the pipe P to be processed. Specifically, the three leg portions 18 are arranged so that the lengths thereof are all the same and the contact plate 19 is in contact with the inner surface of the pipe P. In other words, it arrange | positions so that the center axis | shaft of the radial direction expansion / contraction member 11 of the fixing means 10 and the center axis | shaft of the piping P may become coaxial.
In this state, the insertion member 17 is screwed with respect to the fixing bolt 16 to cause the insertion member 17 to enter the insertion space 12h of the expansion / contraction member 12. Then, since the outer diameter of the expansion / contraction member 12 increases, the contact plates 19 of the three legs 18 are pressed against the inner surface of the pipe P, and the fixing means 10 is fixed in the pipe P. At this time, the diameter of the expansion / contraction member 12 is increased so that the force pressing the contact plate 19 against the inner surface of the pipe P is such that the three leg portions 18 do not move from the inner surface of the pipe P due to the cutting resistance of the cutting blade 39.

  The wall surface processing apparatus 1 may be arranged so that the central axis of the radial expansion / contraction member 11 and the central axis of the pipe P are displaced from the pipe P in the radial direction. In such an arrangement, the three legs 18 may have different lengths.

When the fixing means 10 is fixed to the inner surface of the pipe P, the rotating shaft 22 to which the processing means 30 is attached is inserted into the through hole 21h of the bearing portion 21. At this time, the fixed piece 26 is accommodated in the recess 21s so as not to protrude from the inner surface of the through hole 21h.
Then, when the rotating shaft 22 is inserted into the through hole 21h, the fixed piece 26 is protruded from the recess 21s and disposed in the reduced diameter portion 22s of the rotating shaft 22. Then, the relative movement of the bearing portion 21 and the rotary shaft 22 in the axial direction of the bearing portion 21 is fixed by the fixed piece 26, and the arrangement of the wall surface processing apparatus 1 on the pipe P is completed.

When the wall surface processing apparatus 1 is fixed to the pipe P, the driving means 37 is operated and the cutting blade 39 is rotated. If the screw shaft 33a is rotated in this state, the case 36 moves along the screw shaft 33a, and the cutting blade 39 moves along with the case 36 toward the inner surface of the pipe P. Then, since the cutting blade 39 comes into contact with the inner surface of the pipe P, the inner surface of the pipe P is cut by the cutting blade 39.
After the cutting blade 39 comes into contact with the inner surface of the pipe P, if the case 36 is further moved toward the inner surface of the pipe P, the cutting blade 39 cuts into the inner surface of the pipe P, and the inner surface of the pipe P A vertical groove is formed. When the cutting amount of the cutting blade 39 reaches a predetermined amount, the rotation of the screw shaft 33a is stopped and the movement of the case 36 is stopped.

  When the rotation of the screw shaft 33a is stopped and the motor 24 is operated, the rotating shaft 22 rotates and the machining means 30 rotates around the rotating shaft 22. Then, since the cutting blade 39 moves in the circumferential direction along with the rotation of the processing means 30, the inner surface of the pipe P continues to have the same depth along the circumferential direction as the cutting blade 39 moves. Groove is formed.

  The wall surface processing apparatus 1 can also change the cutting amount of the cutting blade 39 depending on the position of the pipe P in the circumferential direction. That is, grooves having different depths can be formed depending on the position in the circumferential direction. When changing the depth of cut, the rotation of the rotary shaft 22 is stopped once and then the screw shaft 33a is rotated to adjust the depth of cut.

When the cutting blade 39 makes one rotation around the rotation axis 22, the cutting blade 39 returns to the position where the cutting is started. Here, in the wall surface processing apparatus 1, the central axis of the rotating shaft 22 and the central axis of the pipe P coincide with each other, and the rotation surfaces of the screw shaft 33 a and the cutting blade 39 are orthogonal to the central axis of the rotating shaft 22. Yes.
Therefore, when the cutting blade 39 makes one rotation around the rotation shaft 22, the cutting start position and the cutting end position can be matched. That is, according to the wall surface processing apparatus 1, it is possible to form a single connected annular groove along the intersection line between the surface orthogonal to the rotation shaft 22 and the inner surface of the pipe P.

As described above, the wall surface processing apparatus 1 of the present embodiment is stably fixed to the inner surface of the pipe P by the fixing means 10, so that the processing means 30 can process the inner surface of the pipe P in a stable state.
Further, since the fixing means 10 can be fixed to the pipe P with the processing means 30 removed, the fixing work of the fixing means 10 becomes easy. In addition, since the processing means 30 can be attached to and detached from the fixing means 10 in the axial direction, the processing means 30 can be easily attached and detached even in the narrow pipe P. Therefore, the operation of installing the wall surface processing apparatus 1 in the pipe P becomes very easy, and the workability of the operation of processing the inside of the pipe P is improved.

Note that the pipe P cut by the wall surface processing apparatus 1 of the present embodiment is not limited to a pipe whose inner space is a perfect circle, and can be cut even if it is an elliptical or square pipe P. If the cutting depth, that is, the depth of cut is changed according to the position in the circumferential direction, a groove having the same depth can be formed even in the case of a pipe having a cross-sectional shape other than a circle. It is also possible to form grooves having different depths depending on the position.
Furthermore, when a grindstone or the like is provided in the processing means 30 instead of the cutting blade 39, the inner surface of the pipe P can be processed along the inner surface.

  In the above-described example, as the holding member 13 in the fixing unit 10, the configuration in which the moving block 12a is moved in the radial direction by swinging the connecting portion 13c is illustrated. However, the moving block 12a is moved in the radial direction. However, other configurations may be adopted as long as they can be used. For example, a groove extending in the radial direction may be formed in the connecting portion 13c of the holding member 13, and the tip of the moving block 12a may be attached to the groove. In this case, if the tip of the moving block 12a can be moved along the groove, the moving block 12a can be moved along the radial direction when the insertion member 17 enters the insertion space 12h. When this configuration is adopted, there is also an advantage that the outer surface of the moving block 12a can be moved while being kept parallel to the central axis of the radial expansion / contraction member 11.

  The buried pipe wall surface processing apparatus of the present invention is suitable for an apparatus for forming a groove on the inner surface of a buried pipe or cutting a wall of a buried pipe, and is disposed horizontally. The present invention is applicable not only to piping that is provided, but also to cutting of piping that is provided vertically.

It is a schematic front view of a state in which the wall surface processing apparatus 1 of the present embodiment is disposed in a pipe P. It is a schematic side view of a state in which the wall surface processing apparatus 1 of the present embodiment is disposed in a pipe P. It is a schematic rear view of a state in which the wall surface processing apparatus 1 of the present embodiment is disposed in a pipe P. (A) It is a schematic sectional drawing of the fixing means 10, (B) is a BB arrow directional view of (A). FIG. 3 is a schematic explanatory diagram of a state in which a bearing unit 21 of a moving unit 20 is attached to a fixing unit 10. FIG. 6 is a schematic explanatory diagram of the processing means 30 alone. It is a schematic explanatory drawing of a snap lock construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wall surface processing apparatus 10 Fixing means 11 Radial expansion / contraction member 11h Insertion space 12 Expansion / contraction member 12a Moving block 13 Holding member 15 Fixing part 16 Fixing bolt 17 Inserting member 18 Leg part 20 Moving means 30 Processing means 39 Cutting blade P Piping

Claims (6)

A device for processing buried pipes from the inside,
Processing means for processing the inner surface of the pipe;
Fixing means for fixing the processing means in the pipe,
The fixing means is
A radially expanding / contracting member formed in a substantially cylindrical shape and capable of expanding and contracting along the radial direction;
An embedded pipe wall surface processing apparatus comprising: a fixing portion that fixes the radially expanding / contracting member in an expanded state; and a plurality of legs that are erected on a side surface of the radially expanding / contracting member. The radial expansion / contraction member is
It has a plurality of moving blocks arranged side by side around the central axis, and a substantially conical insertion space coaxial with the central axis of the radial expansion / contraction member is formed in a portion surrounded by the plurality of moving blocks. Expansion / contraction member,
A holding member that holds the plurality of moving blocks of the expansion / contraction member in a state in which the movement of the radial expansion / contraction member in the circumferential direction is fixed and the radial expansion / contraction member is movable in the radial direction; And
The insertion space of the expansion / contraction member is formed so that the cross section becomes smaller from the other end toward one end,
The fixing part is
The conical shape is formed into a shape that allows the plurality of members to move by the same length along the radial direction of the radial expansion / contraction member when inserted into the insertion space from the other end of the expansion / contraction member. An insertion member;
2. The wall surface processing apparatus for an embedded pipe according to claim 1, further comprising a movable fixing member that fixes the movement of the insertion member inserted into the insertion space of the expansion / contraction member. The holding member is
Fixing a plurality of moving blocks of the expansion / contraction member, relative movement between the ends in the axial direction;
3. The embedded pipe wall surface processing apparatus according to claim 2, wherein each moving block is held so as to be capable of swinging in a radial direction with one axial end thereof as a fulcrum. A moving means for moving the processing means relative to the fixing means;
The moving means is
4. The buried pipe wall surface processing apparatus according to claim 1, wherein the processing means is moved in a circumferential direction around a central axis of the radial expansion / contraction member. The processing means includes a disk-shaped cutting blade,
The moving means is
The wall surface processing apparatus for an embedded pipe according to claim 4, wherein the processing means is moved in a circumferential direction while maintaining a rotation axis of the cutting blade parallel to a central axis of the radial expansion / contraction member. The moving means is
A rotating shaft provided in the processing means;
It comprises a bearing portion that is provided in the fixing means and holds the rotating shaft so as to be detachable and rotatable.
The bearing portion is
6. The embedded pipe wall surface processing apparatus according to claim 4, wherein the rotating shaft is held such that a central axis thereof is coaxial with a central axis of the radially expanding / contracting member.

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