JP4787530B2 - Drilling device - Google Patents

Description

  The present invention relates to a perforating apparatus for perforating a pipe lining material that is inserted into a pipe and closes a pipe end.

  Conventionally, when existing pipes such as sewer pipes buried in the ground have deteriorated, a lining method is known in which existing pipes are lined with pipe lining material in order to rehabilitate existing pipes without digging them out ( Patent Document 1). The tube lining material is obtained by impregnating an uncured liquid curable resin (generally a thermosetting resin) into a resin absorbent material made of a tubular flexible nonwoven fabric corresponding to the shape of an existing tube. A highly airtight plastic film is attached to the outer peripheral surface of the resin absorbent material. In lining work, pipe lining material is inserted into the existing pipe with the fluid pressure reversed, and the liquid curable resin impregnated in the pipe lining material is heated while pressed against the inner peripheral surface of the existing pipe. Lining is carried out by curing with.

  By the way, branch pipes join main pipes such as sewer pipes. For this reason, when the main pipe is lined with the pipe lining material, the pipe lining material closes the opening at the end of the joining portion of the branch pipe. Therefore, a pipe lining that puts an in-pipe work robot equipped with a drilling machine and a TV camera into the main pipe and is remotely operated from the ground, and rotates the cutter (rotating blade) of the drilling machine to block the end of the branch pipe. The work of removing the portion of the material by drilling from the main pipe side is performed (see FIGS. 5 to 8 of Patent Document 2).

  However, in this operation, it is necessary to position the cutter of the drilling machine in each of the pipe length direction, the circumferential direction, and the vertical direction before drilling. This is performed while monitoring the inside of the main pipe with a TV camera. However, since the inside of the main pipe is dark and difficult to see, the positioning may be wrong, that is, the drilling position may be wrong.

On the other hand, before the above drilling, a forcible connected to a flexible shaft that transmits the rotational power of the motor is inserted into the branch pipe, and the pipe lining material that closes the opening at the end of the branch pipe is inserted. A method of forming a small diameter temporary hole from the branch pipe side is adopted. After forming the temporary hole, a TV camera is inserted into the branch pipe, and the above-mentioned main pipe side is drilled while monitoring the inside of the branch pipe (see FIGS. 10 and 11 of Patent Document 2).
JP-A-6-114939 JP 2000-15509 A

  However, in the method of forming a temporary hole from the branch pipe side, the horusoe is movably supported by a flexible shaft in a direction orthogonal to the pipe length direction of the branch pipe. For this reason, it is difficult to position the horusoe in a desired position in the branch pipe in that direction (for example, the center position of the opening of the branch pipe end), and the drill position may deviate from the desired position. .

  Also, especially when the surface of the pipe lining material closing the end of the branch pipe is hard, the horusoe slides and moves in a direction perpendicular to the pipe length direction of the branch pipe by the rebound of rotation and collides with the inner peripheral surface of the branch pipe. May end up. In this case, there is a problem that the horusoe is broken or the branch lining material is damaged when the branch pipe is lined.

  Accordingly, an object of the present invention is to provide a drilling device capable of easily and accurately positioning a drilling blade when drilling a pipe lining material closing a pipe end, and further preventing the drilling blade from colliding with a pipe inner peripheral surface. Is to provide.

In order to solve the above problems, the perforation apparatus of the present invention,
A piercing device comprising a piercing blade for piercing a pipe lining material inserted into a branch pipe and closing the end of the branch pipe,
A bearing member that rotatably supports a rotating shaft to which the drilling blade is coupled to the tip;
An air bag attached to one side of the outer periphery of the bearing member, and two supports projecting from the outer periphery along the radial direction of the rotating shaft so as to form a predetermined obtuse angle on the opposite side of the outer periphery of the bearing member Positioning means comprising a plate ,
By inflating the air bag with the supply of high-pressure air, the air bag and the support plate are pressed against the inner peripheral surface of the branch pipe, and the drilling blade is positioned in a direction perpendicular to the pipe length direction,
The dimension from the center of the rotating shaft to the outer end of the support plate projecting in the radial direction is defined as the projecting dimension, and the support plate can be replaced with a support plate having a different projecting dimension.

According to the drilling device of the present invention, the support plate of the positioning means can be replaced with a support plate having a different overhang dimension. Therefore, when drilling the pipe lining material, the drilling blade is orthogonal to the tube length direction of the drilling blade. A desired position in the direction can be positioned, and drilling can be accurately performed at the desired position without misalignment. Further, it is possible to prevent the perforation blade from colliding with the inner peripheral surface of the pipe by preventing the perforation blade from moving in the direction orthogonal to the pipe length direction by positioning at the time of perforation. Further, the collision can be reliably prevented by providing a protective cover.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, when the main pipe 12 of the sewer shown in FIGS. 2 and 4 is lined with the pipe lining material 14, the pipe lining material 14 that closes the opening at the end of the joining portion of the branch pipe 13 that joins the main pipe 12 is used. An embodiment of a drilling device used for drilling a portion from the side of the branch pipe 13 is shown. The drilling operation by the punching apparatus of the embodiment will be described in the case where the branch pipe 13 is not lined at the time of drilling. However, the same drilling operation is performed even when the branch pipe 13 is already lined at the time of drilling. be able to.

  1 and 2 are a perspective view showing a structure of a main body of a perforating apparatus according to an embodiment of the present invention and a cross-sectional view of a state where the main body is inserted into a branch pipe 13. In FIG. 1, only the outline of the protective cover 3 and the airbag 8 shown in FIG. 2 is indicated by a broken line and the spring 4 is omitted for easy understanding.

  1 is a hole saw that is a drilling blade for drilling the pipe lining material 14 and is a rotary blade. The hole saw is cylindrical and has a saw-tooth formed on the entire circumference of the tip, and a drill 1a is provided protruding from the center. The horsor 1 is detachably connected to the tip of the rotating shaft 2 that rotatably supports the holsaw 1 by a screw structure (not shown) or the like, that is, exchangeable.

  Reference numeral 3 denotes a protective cover that accommodates and protects the horusoe 1 and is formed in a cylindrical shape whose inner diameter is larger than the outer diameter of the horusaw 1 by a predetermined dimension, and is rotatable and rotatable relative to the distal end portion of the rotary shaft 2. The shaft 2 is provided to be slidable in the length direction. The protective cover 3 is made of a material such as plastic or hard rubber that does not damage the hardened tube lining material when it collides with it. The protective cover 3 is urged toward the distal end side of the rotary shaft 2 by the pressure of a spring (coil spring) 4, and is further restricted by the spring 4 from rotating with the rotary shaft 2. Note that the position of the movement limit of the protective cover 3 in the direction of the distal end of the rotary shaft 2 is restricted so that the protective cover 3 does not contact the hole saw 1 by means such as a stopper (not shown). Further, the protective cover 3 and the tip of the drill 1a are on the same plane in a state where the protective cover 3 is at the movement limit position, or the tip of the drill 1a is slightly retracted from the protective cover 3, The entire horusor 1 including the drill 1a is housed in the protective cover 3 and protected.

  Reference numeral 5 denotes a bearing member, which is formed in a cylindrical shape, is fitted in an intermediate portion of the rotating shaft 2, and supports the rotating shaft 2 so as to be rotatable and slidable in the length direction of the rotating shaft 2. A disc-shaped stopper 6 having a hole formed in the center is fixed to the tip of the bearing member 5. A spring 4 is wound around the rotary shaft 2 between the stopper 6 and the protective cover 3.

  On one side of the outer periphery of the bearing member 5 (upper side in FIG. 1, left side in FIG. 3 (sectional view taken along line AA in FIG. 2)), two rectangular bag mounting plates 7 are erected. Has been. The bag mounting plate 7 projects from the outer periphery of the bearing member 5 so as to form an obtuse angle of a predetermined angle (for example, about 150 °).

  An air bag 8 is detachably mounted on the bag mounting plate 7 through mounting means such as screws (not shown), that is, can be replaced. The air bag 8 has a bag shape made of a flexible and elastic material such as rubber, and one end of an air hose 9 is connected to the bag. As shown in FIG. 4, the other end of the air hose 9 is connected to the air pump 15. By supplying high-pressure air from the air pump 15 to the air bag 8 through the air hose 9, the air bag 8 can be inflated to a size larger than that shown in FIGS.

  Further, on the opposite side of the outer periphery of the bearing member 5 from the airbag 8 (the lower side in FIG. 1 and the right side in FIG. 3), two support plates 10 made of substantially rectangular plastic or the like are erected. . The support plates 10 protrude from the outer periphery of the bearing member 5 along the radial direction of the rotary shaft 2 so as to form an obtuse angle of a predetermined angle (for example, about 120 °). Using the support plate 10 and the airbag 8 as positioning means, the horusoe 1 is positioned in a direction orthogonal to the tube length direction of the branch pipe 13 (hereinafter referred to as “tube orthogonal direction”).

  If the detachable forcible 1 is removed from the tip of the rotating shaft 2, the protective cover 3 and the spring 4 can be removed from the rotating shaft 2, and a stopper 6, a bag mounting plate 7 and a support plate 10 are provided. It is assumed that the bearing member 5 can be pulled out from the rotating shaft 2 and removed. That is, the support plate 10 can be attached to and detached from the rotating shaft 2 together with the bearing member 5, that is, can be replaced. The support plate 10 may be detachably attached to the bearing member 5 via attachment means such as screws, that is, may be attached so as to be replaceable alone.

  In addition, one end of a flexible flexible shaft 11 is detachably connected to the rear end of the rotating shaft 2 via respective joints 2a and 11a. The other end of the flexible shaft 11 is connected to a motor 16 shown in FIG. The rotational power of the motor 16 is transmitted to the rotary shaft 2 via the flexible shaft 11 so that the rotary shaft 2 rotates and the horusoe 1 rotates. When the branch pipe 13 has a large refraction angle, the joints 2a and 11a are universal joints.

  With the drilling device having the above-described configuration, the portion where the lining material 14 lining the main pipe 12 shown in FIGS. 2 and 4 blocks the opening at the end of the joining portion of the branch pipe 13 is drilled from the branch pipe 13 side. To do. At that time, first, the punching device main body connecting the air hose 9 and the flexible shaft 11 is inserted into the branch pipe 13. Then, the air hose 9 and the flexible shaft 11 are fed out to push the main body of the drilling device, and the pipe lining material 14 in which the position shown in FIG. 2, that is, the tip of the protective cover 3 or the drill 1 a blocks the end opening of the branch pipe 13. Insert to the position where it touches. At this time, even if the protective cover 3 collides with the pipe lining material 14, the spring 4 is compressed and retracted, and the impact of the collision is buffered.

  During this insertion, high pressure air is not supplied to the airbag 8, and the airbag 8 is contracted to an original size that is significantly smaller than the size shown in FIGS. Thereby, the positional relationship of the perforating apparatus main body with respect to the branch pipe inner peripheral surface 13a shown in FIG. 3 can be set to the positional relationship with respect to the branch pipe inner peripheral surface 13a indicated by a one-dot chain line. That is, the support plate 10 can be prevented from hitting the inner peripheral surface 13a of the branch pipe and cannot be used, and the punching device main body can be smoothly inserted. Moreover, since the flexible shaft 11 is bent, even the portion where the branch pipe 13 is refracted can be passed without changing the orientation of the main body of the punching device.

  When the main body of the punching device is inserted to the position shown in FIG. 2, the air pump 15 on the ground is driven, high-pressure air is supplied to the air bag 8 through the air hose 9, and the air bag 8 is shown in FIGS. Inflate to the indicated size. That is, as shown in FIG. 3, the airbag 8 presses each of the support plates 10 against the inner peripheral surface 13 a of the branch pipe and inflates itself to such a size that it can be pressed against the inner peripheral face 13 a of the branch pipe. The bearing member 5 is fixed at the position shown in FIG. 3 by pressing the airbag 8 and the support plate 10 by the air pressure. And in the pipe orthogonal direction of the branch pipe 13, the rotating shaft 2 is positioned at the position shown in the figure, and the horusoe 1 is positioned at that position. Here, a dimension from the center of the rotating shaft 2 to each outer end of the support plate 10 projecting in the radial direction (hereinafter referred to as a projecting dimension of the support plate 10) is, for example, the radius of the inner diameter of the branch pipe 13 Same dimensions as Thereby, the rotating shaft 2 is positioned at the center position of the branch pipe 13, and the horusoe 1 is positioned at the center position of the end opening of the branch pipe 13.

  Next, the flexible shaft 11 is pressed toward the drilling device main body, the rotary shaft 2 is slid toward the main pipe 12, and the drill 1 a of the horusoe 1 is pressed against the pipe lining material 14. Then, the ground motor 16 is driven to rotate the horusoe 1. Thereby, a small hole is first drilled by the drill 1a. Then, by further pressing the main body of the horusoe 1 against the pipe lining material 14, the pipe lining material 14 is perforated by the main body of the horuseau 1 as shown in FIG. 4. During this time, the rotating shaft 2 is slid to the inside of the main pipe 12 with respect to the bearing cover 5 fixed by the air bag 8 and the support plate 10 and the protective cover 3 which is stopped in contact with the pipe lining material 14. . In this way, the pipe lining material 14 is perforated at the center position of the end opening of the junction part of the branch pipe 13 with the main pipe 12.

  In addition, it drills in the center position of the edge part opening of the branch pipe 13 when drilling a temporary hole. In this case, after drilling the temporary hole, the main body of the punching device is pulled out from the branch pipe 13 to the ground, a TV camera (not shown) is inserted into the branch pipe 13, and the inside of the branch pipe 13 is monitored, The main hole corresponding to the end opening of the branch pipe 13 is drilled by an in-pipe work robot equipped with a drilling machine (not shown).

  Further, the hole can be punched from the side of the branch pipe 13 by the punching device of the present embodiment. In that case, a plurality of small holes are continuously drilled at a plurality of locations on the circumference of a predetermined radius R2 which is concentric with the circumference of the end opening of the branch tube 13 and smaller than the radius R1 of the inner diameter of the branch tube 13. One large main hole is formed continuously in the circumferential direction. In this case, the support plate 10 is replaced with one having an overhang dimension smaller than the radius R1 of the inner diameter of the branch pipe 13 by the predetermined radius R2 (R1-R2). Moreover, when the size which can expand | swell the air bag 8 is insufficient for positioning, it replaces | exchanges for what can be expanded more.

  According to the punching apparatus of the embodiment as described above, when the pipe lining material 14 closing the end of the branch pipe 13 is punched, the horusoe 1 is perpendicular to the pipe of the branch pipe 13 by the airbag 8 and the support plate 10. Easy and accurate positioning in the direction. Furthermore, by exchanging the support plate 10 with a different projecting dimension, or by exchanging it with a different size that allows the airbag 8 to be inflated if necessary, in response to the difference in the inner diameter of the branch pipe 13, The horusoe 1 can be positioned at a desired position in the direction perpendicular to the pipe of the branch pipe 13. That is, the drilling can be accurately performed with respect to the desired position without positional deviation.

  Further, since the hole saw 1 is held at a fixed position by the air pressure of the air bag 8 so that the hole saw 1 does not move in the direction perpendicular to the pipe of the branch pipe 13 during drilling, the hole saw 1 slides on the pipe lining material 14 and rotates. It can prevent moving in the direction orthogonal to the pipe and colliding with the inner peripheral surface 13a of the branch pipe 13. Furthermore, even if the horusoe 1 overcomes the holding force due to the air pressure and moves in the direction perpendicular to the pipe, the horusoe 1 is accommodated in the protective cover 3 and therefore does not directly collide with the inner peripheral surface 13a of the branch pipe. Further, the horusoe 1 does not directly collide with the inner peripheral surface 13a of the branch pipe when the punching device body is inserted into the branch pipe 13 or pulled out. Therefore, it is possible to reliably prevent problems such as breakage of the horusoe 1 due to the collision or damage of the pipe lining material when the branch pipe 13 is already lined with the pipe lining material.

  In the configuration of the embodiment, instead of the air bag 8, a bag that is inflated by the pressure of a liquid such as water or oil may be used. Moreover, it is good also as what drills with a drilling blade (rotary blade) other than the hole saw 1. FIG. Needless to say, the positioning technique of the present invention can also be applied to a drilling device for drilling a pipe lining material other than a sewer.

It is a perspective view which shows the structure of the punching apparatus main body of the Example of this invention. It is sectional drawing which shows the state which positioned the punching device main body of the Example in the branch pipe. It is sectional drawing along the AA line in FIG. It is sectional drawing which shows a mode that the pipe lining material which has blocked the branch pipe end part with the punching apparatus of an Example is drilled.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horso 2 Rotating shaft 3 Protective cover 4 Spring 5 Bearing member 6 Stopper 7 Bag mounting plate 8 Air bag 9 Air hose 10 Support plate 11 Flexible shaft 12 Main pipe 13 Branch pipe 14 Pipe lining material 15 Air pump 16 Motor

Claims (3)

A piercing device comprising a piercing blade for piercing a pipe lining material inserted into a branch pipe and closing the end of the branch pipe,
A bearing member that rotatably supports a rotating shaft to which the drilling blade is coupled to the tip;
An air bag attached to one side of the outer periphery of the bearing member, and two supports projecting from the outer periphery along the radial direction of the rotating shaft so as to form a predetermined obtuse angle on the opposite side of the outer periphery of the bearing member Positioning means comprising a plate ,
By inflating the air bag with the supply of high-pressure air, the air bag and the support plate are pressed against the inner peripheral surface of the branch pipe, and the drilling blade is positioned in a direction perpendicular to the pipe length direction,
A perforation apparatus characterized in that the dimension from the center of the rotating shaft to the outer end of the support plate projecting in the radial direction is the projecting dimension, and the support plate can be replaced with a support plate having a different projecting dimension. .   The perforating apparatus according to claim 1, further comprising a protective cover that accommodates and protects the perforating blade. The cutting head is perforation apparatus according to claim 1 or 2, characterized in that it is driven to rotate through the flexible shaft for transmitting the rotation power of the motor.

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