JP6090397B1 - Drilling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small drilling device capable of drilling a pipe lining material closing an opening end of a branch pipe. A punching device includes a flexible shaft 20 that transmits a driving force of a motor to a rotating shaft, a hole saw cutter 23 that is attached to the rotating shaft and drills a pipe lining material 13 with a diameter smaller than a branch pipe radius, and an air bag 40. Prepare. When the airbag is inflated in the radial direction in the branch pipe, the hole saw cutter is positioned at a position where the drilling axis is shifted from the central axis of the branch pipe, and the pipe lining material is drilled. [Selection] Figure 1

Description

  The present invention relates to a perforating apparatus for perforating a pipe lining material closing an end of a branch pipe from the side of the branch pipe.

  2. Description of the Related Art Conventionally, aging sewer mains are lined using a pipe lining material in which an uncured liquid curable resin is impregnated in a resin absorbent material made of a tubular flexible nonwoven fabric.

  When the main pipe is lined, the pipe lining material closes the open end of the branch pipe, so the part of the pipe lining material blocking the open end of the branch pipe is drilled from the main pipe side and removed. ing. In this work, before drilling, it is necessary to position the cutter of the drilling machine in each of the main pipe length direction, circumferential direction and vertical direction, so drilling is not performed from the main pipe side, but from the branch pipe side. The method of performing is proposed in Patent Documents 1 and 2 below.

  In the configuration of Patent Document 1, a rubber sleeve that can be expanded and contracted is held so that the rod coincides with the central axis of the branch pipe, a cutter is attached to the front portion of the rod, and the center of the cutter coincides with the branch pipe axis. Drilling.

  Moreover, in the structure of patent document 2, an air bag is attached to the outer peripheral piece side of the bearing member which bears the rotating shaft of a horuseau cutter, a support plate is attached to the opposite side, and the air bag is inflated with high-pressure air, so The perforation axis is aligned with the branch pipe axis.

JP-A-8-81995 JP 2006-289597 A

  In the configuration of Patent Document 1, since the cutter is only elastically held by the rubber sleeve, there is a problem that the cutter cannot be held firmly and the cutter cannot vibrate due to vibration during drilling. .

  Moreover, in the structure of patent document 2, a small-diameter pilot drill is attached to the center of the hole saw cutter, a small hole is first drilled by this drill, and the hole saw cutter that rotates at high speed by drilling with this drill as a fulcrum Is preventing. However, the main pipe and the branch pipe are often attached not only vertically but also obliquely, and since the drilling surface is curved, there is a problem that the pilot drill breaks or escapes and cannot be drilled.

  In addition, the branch pipe has a bent portion, and in order to carry the punching device into the branch pipe, it is necessary to pass the bent portion. Therefore, it is necessary to reduce the size of the punching device including the drilling blade, and the diameter is large. There is a problem that a hole cannot be drilled.

  An object of the present invention is to solve these problems and to provide a small-sized drilling device capable of drilling a pipe lining material closing the branch pipe opening end.

The present invention relates to a perforating apparatus for perforating a pipe lining material closing an open end of a branch pipe from the side of the branch pipe, a flexible shaft that transmits a driving force of a motor to a rotary shaft, A cutter having a diameter for drilling a pipe lining material smaller than a branch pipe radius, and positioning means for positioning the cutter so that a drilling axis of the cutter is deviated from a central axis of the branch pipe , A reaction force plate, which is a curved plate having a curved surface whose radial position is immovable with respect to the cutter, and when the airbag is inflated radially in the branch pipe, the reaction force plate It is pressed against the inner wall surface of the branch pipe and held on the inner wall surface, and the radial position of the cutter is positioned .

  Further, the reaction force plate can be replaced with a reaction force plate having a different thickness.

  A moving mechanism is provided for moving the flexible shaft in the circumferential direction along the inner wall surface of the branch pipe.

  Furthermore, the cutter is a horuseau cutter.

  In the present invention, since the diameter of the cutter is smaller than the branch pipe radius, the cutter can be miniaturized, and the punching shaft of the cutter is positioned so as to deviate from the central axis of the branch pipe. Can be smoothly inserted from the ground into the branch pipe, and reliable drilling can be performed. In addition, since the radial position of the reaction force plate that is pressed against the inner peripheral surface of the branch pipe and is held on the inner peripheral surface is immovable with respect to the cutter, the radial position in the branch pipe of the cutter is fixed and is drilled. The vibration of the cutter can be suppressed, and good drilling can be performed.

It is explanatory drawing which showed the state which inserts a piercing | piercing apparatus in a branch pipe from the ground. (A) is a side view of the punching apparatus in a state where the air bag is removed, (b) is a longitudinal sectional view thereof, and (c) is a front view of the punching apparatus viewed by removing the hole saw cutter. It is a side view of a perforation apparatus when an air bag is attached and inflated. It is explanatory drawing which showed the process which attaches an airbag. (A) is explanatory drawing when the moving mechanism which moves a perforation apparatus to the circumferential direction of a branch pipe is mounted | worn, and the perforation apparatus is inserted in a branch pipe, (b) is a front view of a movement mechanism, (c) is the side surface FIG. (A) is explanatory drawing which shows the piercing | piercing state when one hole is pierced with a piercing | piercing apparatus, (b) is explanatory drawing which shows the piercing | piercing state when moving a piercing | piercing apparatus to the circumferential direction and performing several piercing | piercing. is there.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the punching device 10 of this embodiment is inserted from the ground toward the open end 11 a of the branch pipe 11 that joins the main pipe 12 via the branch pipe 11. The main pipe 12 is lined with a pipe lining material 13 in which an inner wall surface is impregnated with an uncured liquid curable resin in a resin absorbent made of a tubular flexible nonwoven fabric, and the branch pipe opening end portion 11a has a pipe lining. It is blocked by the material 13. The punching apparatus 10 cuts and drills the pipe lining material 13 closing the open end 11a of the branch pipe 11 from the branch pipe 11 side.

  FIG. 2 shows a state in which an air bag 40 to be described later is removed from the punching device 10, FIG. 2 (a) is a side view of the punching device 10, and FIG. 2 (b) is a longitudinal sectional view thereof. 2 (c) is a front view when the horusaw cutter 23 is removed and viewed from the cutter side.

  The drilling device 10 has a flexible shaft 20 having a rotation shaft 21, and the other end of the flexible shaft 20 is coupled to a motor 15 installed on the ground as shown in FIG. 1. The rotating shaft 21 is rotatably supported via a bearing portion 22 attached in the sliding shaft 24, and a horusaw cutter 23 is fixed to the other end of the rotating shaft 21. The Horso cutter 23 is a cutter whose diameter d (for example, 50 mm) is smaller than the radius r (for example, 150/2 mm) of the branch pipe 11 and is sized to be easily inserted into the branch pipe 11.

  The sliding shaft 24 is attached to the flexible shaft 20 via the connection fitting 31 so that the sliding shaft 24 can slide in the support shaft 25 supported between the disk-shaped front support plate 26 and the rear support plate 27. The sliding shaft 24 is urged toward the flexible shaft 20 by a spring 28 attached on the sliding shaft 24 between the support shaft 25 and the connection fitting 31, and is normally in a position as illustrated. When the flexible shaft 20 is pressed in the right direction in the figure, the sliding shaft 24 slides within the support shaft 25 against the biasing force of the spring 28, and the rotary shaft 21 and the horusaw cutter 23 fixed to the rotary shaft 21. Move right, that is, forward.

  A reaction force plate 30 curved inward according to the curvature of the front support plate 26 is detachably attached to the lower portion of the support shaft 25 between the front support plate 26 and the rear support plate 27. The outer curved surface 30 a of the reaction force plate 30 is curved substantially the same as the circumferential surface of the front support plate 26, and the inner side thereof is a curved surface 30 b that contacts the support shaft 25.

  The distance between the outermost peripheral part of the reaction force plate 30 and the axis of the rotating shaft 21 is h, and the reaction force plate 30 is pressed against the inner wall surface of the branch pipe 11 by the airbag 40 as will be described later. Since it is held by the inner wall surface of the branch pipe, the hole saw cutter 23 attached to the rotating shaft 21 is positioned on the inner wall surface of the branch pipe with its perforation shaft 23a being shifted from the central axis 11b of the branch pipe 11.

  Since the reaction force plate 30 can be removed, when the reaction force plate 30 having a large thickness t is attached, the reaction force plate 30 protrudes beyond the front support plate 26 and the rear support plate 27 in the radial direction. By changing (increasing) the thickness of the plate 30, the distance h between the drilling shaft 23 a of the hole saw cutter 23 and the inner wall surface of the branch pipe 11 can be changed (increased).

  Further, an attachment pipe 29 for attaching a television camera (not shown) provided as necessary is fixed to an upper portion between the front support plate 26 and the rear support plate 27. The attachment pipe 29 is attached at a position such that its central axis substantially coincides with the central axis 11b of the branch pipe.

  As shown in FIG. 3, an air bag 40 is attached to the punching device 10. The air bag 40 and the reaction force plate 30 constitute positioning means for positioning the hole saw cutter 23 so that the perforation shaft 23a is displaced from the branch tube central shaft 11b.

  As shown in FIG. 4A, the airbag 40 has a so-called donut shape in which the center is opened, and after the reaction force plate 30 is removed from the front support plate 26 and the rear support plate 27. The mounting pipe 29 and the support shaft 25 are disposed between the front support plate 26 and the rear support plate 27 so that the mounting pipe 29 and the support shaft 25 are located in an open space in the center of the airbag 40.

  Subsequently, as illustrated in FIG. 4B, the reaction force plate 30 is moved to the front support plate 26 and the rear support plate so that a part of the airbag 40 is sandwiched between the reaction force plate 30 and the support shaft 25. 27 is attached.

  As shown in FIG. 1, when compressed air is supplied from the air compressor 16 via the air hose 41, the air bag 40 expands in the radial direction of the branch pipe as shown in FIGS. To do. When the air bag 40 is sufficiently inflated, the reaction force plate 30 is pressed against the inner wall surface of the branch pipe 11 and held there, and the horusaw cutter 23 is also held at a position where the perforated shaft 23a is deviated from the branch pipe central axis 11b. The

In such a configuration, after the airbag 40 is attached between the support plates 26 and 27 by the method shown in FIG. 4, the punching device 10 is inserted into the branch pipe 11 from the ground while the airbag 40 is contracted. . Since the air bag 40 is contracted, the punching device main body is not bulky, and the hole saw cutter 23 is small in size, so that the punching device main body can be smoothly inserted even if the branch pipe 11 is bent.

  The perforating apparatus 10 reaches the pipe lining material 13 that closes the branch pipe opening end portion 11a by its own weight. The television camera or touch is used to confirm that the horsor cutter 23 has approached or contacted the pipe lining material 13, and then the air compressor 16 is operated to supply compressed air into the air bag 40 through the air hose 41.

  When the air bag 40 is sufficiently inflated, the reaction force plate 30 is pressed against and held by the inner wall surface of the branch pipe 11, and the hole saw cutter 23 also has its perforation shaft 23a displaced in the radial direction from the branch pipe central axis 11b. In addition, the drilling shaft 23a is positioned at a position h from the inner wall surface of the branch pipe.

  In this state, the motor 15 is rotated to rotate the hole saw cutter 23, and the flexible shaft 20 is pushed in. The sliding shaft 24 slides within the support shaft 25 against the biasing force of the spring 28. By this sliding, the horusaw cutter 23 moves in the radial direction along the central axis 11b of the branch pipe 11 while maintaining the above-mentioned positioned state, and the pipe lining material 13 that closes the branch pipe opening end portion 11a. To cut.

  When the drilling is finished, as shown in FIG. 6 (a), a circular hole 18 having a diameter d centering on a position h away from the inner wall surface of the branch pipe 11 in the radial direction is the center of the branch pipe. Drilled off the axis.

  The hole 18 drilled in this way has a small diameter and does not completely open the branch pipe opening end, but the hole 18 can function as a temporary hole. Accordingly, from the main pipe side, the pipe lining material closing the branch pipe opening end with the provisional hole as a mark can be completely cut to open the branch pipe end.

  In the first embodiment, only one hole is drilled. Therefore, a moving mechanism 50 for moving the flexible shaft 20 in the circumferential direction along the inner wall surface of the branch pipe as shown in FIG. 5 is provided.

  The moving mechanism 50 has wheels 51 to 54, and the wheels 51 and 52 are rotatably attached to a bending lever 55 bent at a right angle, and the wheels 53 and 54 are similarly attached to a bending lever 56 bent at a right angle. The flexible shaft 20 is sandwiched between the sandwiching levers 58 and 59, and the bending levers 55 and 56 are coupled to the sandwiching levers 58 and 59 via the coupling member 57. The diameter of the flexible shaft 20 is slightly smaller than the diameter of the ring portion sandwiching the flexible shaft 20 of the sandwiching levers 58 and 59. The flexible shaft 20 is held in the ring of the sandwiching levers 58 and 59 while the flexible shaft 20 It is possible to rotate in 20 circumferential directions.

  The wheels 51 to 54 are arranged at intervals of 90 degrees, and these wheels 51 to 54 are arranged so as to be insertable into the branch pipe 11. When the wheels 51 to 54 are inserted into the branch pipe 11, the wheels 51 to 54 are branched. It arrange | positions so that it may contact | abut to the internal peripheral surface of the pipe | tube 11, or may approach. The flexible shaft 20 is supported by the moving mechanism 50 and is held so as to substantially coincide with the central axis 11 b of the branch pipe 11. By rotating these wheels 51 to 54, the flexible shaft 20 can smoothly move in the direction of the central axis 11b of the branch pipe 11 when inserted into the branch pipe 11.

An example in which two such moving mechanisms 50 are attached and drilled is shown in FIG. The flexible shaft 20 is held by the moving mechanism 50 and inserted into the branch pipe 11. Since the wheel 53 contacts the inner wall surface of the branch pipe and rotates by frictional contact, the insertion of the drilling device 10 becomes smooth. The first hole is drilled in the manner described in Example 1.

When the first hole is drilled, the airbag 40 is contracted and the punching device 10 is moved so that the hole saw cutter 23 is positioned away from the branch pipe opening end 11a . In this state, the operation lever 60 coupled to the flexible shaft 20 is manually rotated by about 60 degrees (θ), the drilling device 10 is rotated by about 60 degrees in the circumferential direction, and the hole saw cutter 23 is moved to the branch pipe opening end. Move them closer together. At this time, the flexible shaft 20 rotates in the circumferential direction of the flexible shaft 20 in the ring formed by the two sandwiching levers 58 and 59 while being held on the central axis 11 b of the branch pipe 11 by the moving mechanism 50.

When the air bag 40 is inflated at a position where the horsaw cutter 23 is close to the branch pipe opening end portion 11a , the piercing shaft 23a is separated from the inner wall surface of the branch pipe at a position rotated about 60 degrees in the circumferential direction. Positioned at a separate position. In this state, the hole saw cutter 23 is moved in the tube axis direction to drill a second hole.

Thereafter, the same operation can be repeated to drill the six holes 18a to 18f that are displaced at intervals of 60 degrees as shown in FIG. 6B. When the sixth hole 18f is drilled, the central portion 13a of the pipe lining material 13 can be cut off, so that a large hole can be made in the branch pipe opening end portion 11a although there are irregularities. This uneven hole can be removed from the main pipe side later to completely remove the pipe lining material 13 and open the end of the branch pipe as it was.

DESCRIPTION OF SYMBOLS 10 Punching device 11 Branch pipe 12 Main pipe 13 Pipe lining material 15 Motor 16 Air compressor 20 Flexible shaft 21 Rotating shaft 22 Bearing part 23 Horso cutter 24 Sliding shaft 25 Support shaft 26 Front support plate 27 Back support plate 28 Spring 29 Mounting pipe 30 Pressing plate 31 Connection fitting 40 Air bag 41 Air hose 50 Moving mechanism 60 Operation lever

Claims (4)

A drilling device for drilling a pipe lining material closing the branch pipe opening end from the branch pipe side, a flexible shaft for transmitting a driving force of a motor to a rotating shaft;
A cutter attached to the rotating shaft and having a diameter smaller than a branch pipe radius for drilling the pipe lining material;
Positioning means for positioning the cutter so that the perforation axis of the cutter is displaced from the central axis of the branch pipe ,
The positioning means includes an air bag and a reaction force plate that is a curved plate having a curved surface whose radial position does not move with respect to the cutter, and when the air bag is expanded in the radial direction in the branch pipe, The punching device, wherein the reaction force plate is pressed against an inner wall surface of the branch pipe and held on the inner wall surface, and a radial position of the cutter is positioned . 2. The perforating apparatus according to claim 1, wherein the reaction force plate is replaceable with a reaction force plate having a different thickness . The perforating apparatus according to claim 1, further comprising a moving mechanism that moves the flexible shaft in a circumferential direction along an inner wall surface of the branch pipe . The punching device according to any one of claims 1 to 3, wherein the cutter is a horuseau cutter .

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