JP3894642B2 - Pipe drilling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a punching tool in which a cylindrical blade body capable of cutting by cutting into an iron pipe is provided, and a cutting piece holding mechanism for holding a cutting piece cut by the blade body is provided in the blade body. relates drilling methods tubes perforated steel tube was, for example, in the case that installing a bypass pipe for pipeline repair, drilling method is that the tube used when drilling the mounting position of the bypass pipe About.
[0002]
[Prior art]
Conventionally, in the drilling tool described above, a center drill that rotates integrally with the blade body and drills in the tube is provided in the blade body concentrically with the blade body to constitute the work piece holding mechanism. Is placed in a state where the blade edge part protrudes from the blade edge part of the blade body, and a locking mechanism for locking the work piece is provided at a position away from the edge part of the center drill at the end of the center drill. As the locking mechanism, there is a built-in locking piece for the cutting piece that can be moved back and forth in the radial direction of the end portion, or a male screw portion is formed on the outer peripheral portion of the end portion. There was something that was done.
In the former case, the locking piece is inserted into the lateral hole formed in the end portion so as to be freely retractable from the lateral hole toward the outer side in the radial direction of the end portion, and is locked to the end portion. A spring for projecting and urging the locking piece radially outward is provided between the two pieces. With this configuration, as the cutting with the center drill proceeds and the locking piece enters the cutting hole, the locking piece is pressed against the inner wall portion of the cutting hole and enters the drill blade. With retraction, the locking piece passes through the cutting hole, and at the same time, the locking piece protrudes outward in the radial direction by the urging force of the spring and is locked to the back surface of the cutting target piece.
In the latter case, the male screw part is hardened to increase the hardness, and as the center drill cuts, the male screw part bites into the pipe and holds the work piece in the bited state. It was composed.
[0003]
In addition, in the case of assuming the work of installing the bypass pipe described above, after performing the work such as repairing the pipe line after installing the bypass pipe, the gas is used to shut off the gas to the work location. Although it is necessary to insert a shut-off jig from the perforated part, in recent years, relatively large gas shut-off jigs tend to be used for the purpose of ensuring the shut-off of the gas. There is a demand that the cutting hole must be formed large.
[0004]
[Problems to be solved by the invention]
However, according to the above configuration, in any case, in order to cut the cut piece with the center drill, the chip is separated from the cutting with the blade, and the total amount of the chip is increased. There is a drawback that it takes time and effort, and that it requires extra power to rotate the center drill.
Further, in the case where the locking piece for locking the workpiece to be cut is built in the center drill as the locking mechanism, a hole is formed at the end of the center drill, and the protrusion, spring, etc. Therefore, there is a disadvantage that the structure of the locking mechanism is complicated and it takes time to manufacture, and the center drill cuts the tube prior to cutting with the blade body, Even if it is attempted to stop drilling in the middle, if the workpiece is already supported from below by the protrusion, there is a drawback that the entire drilling tool cannot be pulled up.
[0005]
Furthermore, according to the above-described configuration, if there is no tube at the opposite location to be cut by the center drill, the cut piece cannot be lifted. For example, the entire hole is formed by sequentially drilling using a drilling tool having a predetermined diameter. If it is necessary to cut the Δ portion (C in the figure) remaining at the edge of the hole, the center drill is not useful at all, and the cut piece to be cut falls into the pipe. . Then, the passage of the tube is disturbed, and various inconveniences are likely to be caused. Therefore, it is necessary to remove the fallen work piece. Since this work is very time-consuming, workability such as installing the above-mentioned bypass pipe is reduced.For example, in the case of work related to underground pipes under the road, with the extension of the construction period, In some cases, the surrounding area was greatly affected.
[0006]
Therefore, in view of the above drawbacks, the object of the present invention is not to produce chips separate from the cutting by the blade body, does not require new power, and the structure of the locking mechanism can be easily and easily manufactured. When drilling is stopped midway, it can be easily pulled away from the pipe, and it is made of iron using a punching tool that makes it possible to collect even relatively small workpieces that could not be collected . It is an object of the present invention to provide a method for punching a tube for punching a tube .
[0007]
[Means for Solving the Problems]
In order to achieve this object, the characteristic configuration of the tube drilling method according to the present invention is as follows:
A drilling step of drilling so that two circular holes are connected in series;
A cylindrical blade that can be cut by cutting into an iron pipe is provided, and a workpiece holding mechanism that holds the workpiece to be cut by the blade is provided in the blade, and can be contacted with the workpiece. A contact member having a contact surface is disposed in the blade body, is provided so as to be movable in and out with respect to the blade body, and relatively rotatable around an axis of the blade body, and a peripheral portion of the contact surface In addition, at least a pair of magnets disposed at positions facing each other in the radial direction of the blade body is provided to form the cut piece holding mechanism, the contact member is formed in a disk shape, and the contact surface is Using the drilling tool formed in a shape along the concave spherical surface, the two contact portions of the contact member and the blade edge portion of the blade body are formed between the two holes. A cutting process of cutting the Δ part with the blade body,
And a take-out step of taking out the Δ part held by the cut piece holding mechanism together with the punching tool from the pipe .
[0008]
[Function and effect]
That is, when a cylindrical blade is rotated around its axis and pressed against an iron tube, the blade can pierce the tube and cut into the tube. At this time, the cut piece of the tube drilled in the blade body tends to fall into the tube from the drilled hole. At this time, if the cut piece holding mechanism is provided, the cut piece holding mechanism is arranged to face the position where the cut piece is generated when the blade is brought into contact with the pipe. , It can be magnetically attached to the tube. In addition, since the magnetically attached work piece holding mechanism is provided so as to be relatively rotatable with respect to the blade body, even if the blade body is rotated to perform a cutting operation, the magnet is made of the iron tube. In order to maintain the state of being magnetically attached to the outer surface, at the end of the cutting operation, the cut piece remains held by the cut piece holding mechanism and does not fall into the pipe. Since this work piece is removed from the pipe along with the removal of the punching tool, the workability of the work as a whole is improved as compared with the conventional work that had to spend effort on the work of removing the work piece. did.
Further, since the magnets are disposed on the periphery of the contact surface at positions facing each other in the radial direction of the blade body, for example, as shown in FIG. Thereafter, when cutting the Δ portion remaining between the hole portions, as shown in FIG. 3, the Δ portion is arranged at a position facing each other in the radial direction of the rotating blade body of the blade body. Therefore, if the magnets are arranged on the peripheral portion in pairs necessary for magnetizing a pair of Δ portions, they can be efficiently magnetized with a small number of magnets.
Since the contact member is provided so as to be rotatable relative to the blade body, for example, the blade body and the blade are connected to the same machine body so that the rotational force of the blade body is not transmitted to the contact member. Even if it is only provided, the contact member often rotates while the blade body vibrates slightly with the rotation of the blade body. It is often used in a form that can be magnetized. Therefore, it is possible to sufficiently hold the workpiece to be cut even when only one pair of the magnets is provided with respect to the contact member. Therefore, the contact member can be formed with a light magnet or with a small amount of processing, and the cutting tool can be provided at low cost.
[0009]
In addition, since the contact surface has a shape along the concave spherical surface, when the contact member is in contact with the above-described Δ part and the workpiece is to be magnetized, the magnet is in any phase around the axis. Even so, the contact surface comes to face along the Δ portion, and as the contact member rotates around the axis, the magnet can be more securely attached to the Δ portion. I can .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 and 2, one end of a T-shaped branch pipe 1 is fixed to the upper surface of an iron gas pipe 2, and a punching tool 3 is inserted into an upright pipe portion 4 of the branch pipe 1 for rotating operation. The state where the drilling tool 3 is lowered while being rotated electrically by the rod 5 and is drilled in the upper surface portion of the gas pipe 2 is shown.
[0011]
The punching tool 3 is configured by providing, in a bottomed cylindrical blade body 6, a work piece holding mechanism 9 for holding a work piece 8 cut by the blade body 6.
[0012]
The blade body 6 is provided with a blade edge portion 7 at an opening end portion thereof and a first male screw portion 12 for connecting a rotation operation rod at a head portion thereof, and the cutting piece holding mechanism along an axis. A support shaft attaching portion 11 constituting a part of 9 is formed. The said blade edge | tip part 7 forms a sawtooth-shaped blade over the perimeter of an opening edge part.
[0013]
A support shaft 16 is pin-connected to the support shaft mounting portion 11, and a pair of upper and lower ring members 18, 19 are externally held, and the lower ring member 18 is retained by a retaining member 23. Thus, the ring member 18 on the lower side is configured to hold the ring member 19 on the upper side via a spring 24. The upper ring member 19 includes a ball bearing 19a, and even if the support shaft 16 receives a rotational force from the rotary operation rod, the ring member 19 can be stationary without receiving the rotational force. It is.
[0014]
The contact member A includes six magnets 15 (three pairs facing each other in the radial direction) shifted in phase by 60 degrees in the circumferential direction on the contact surface 18a side of the lower ring member 18 formed in a disk shape. ) The work piece 8 is embedded so as to be magnetically attachable.
[0015]
Next, the operation of each part of the punching tool when the gas pipe 2 is punched by the punching tool 3 having the cut piece holding mechanism 9 formed by the above configuration will be described.
[0016]
First, two holes B1 are arranged side by side (see FIGS. 4A and 4B). Thereafter, when the Δ portion C generated between the hole portions B1 is cut by using the cutting tool of the present invention, the contact member A is shown in FIGS. In addition, even a minute cut piece that contacts the gas pipe 2 and forms the Δ portion C can be magnetically held.
More specifically, the blade edge portion 7 of the blade body 6 is brought into contact with the outer surface portion of the gas pipe 2, the outer surface portion of the gas pipe 2 is attracted to the magnet 15, and the blade body 6 is rotated in that state. . Since the magnet 15 is provided so as to be relatively rotatable around the axis of the blade body 6 with respect to the blade body 6, the magnet 15 does not rotate with the blade body 6 even when the blade body 6 is rotated. Keep the outer surface part adsorbed. At the time of drilling, the blade body 6 is positioned substantially concentrically with respect to the upright tube portion 4, and the drilling of the blade body 6 is prevented while smoothly drilling. As the perforation of the gas pipe 2 by the blade body 6 proceeds, the magnet 15 is pushed relatively to the gas pipe 2 against the urging force of the spring 24 while adsorbing the outer surface portion of the gas pipe 2. Retire into the blade body 6. Even when the drilling is completed and the part C is separated from the gas pipe 2 to become the cut piece 8, the cut piece 8 and the chips are held in the magnet 15 without being dropped into the pipe. .
[0017]
When the drilling operation is completed, a long hole B is formed (see FIG. 4 (c)), and a pipe-cutting jig D is inserted from the long hole B to perform drilling. The gas pipe 2 is closed to allow the gas in the gas pipe 2 to flow through the branch pipe 1 (see FIG. 5). When this operation is performed between the pair of branch pipes 1, the gas flow path bypasses the bypass path 30, and the renewal laying work and the like of the intermediate gas pipe 2 </ b> A can be performed safely. In addition, the shape of the contact surface of the contact member A used here is a shape along a spherical surface having a diameter matching the diameter of the gas pipe, and the phase around the axis of the contact member A is any It is set as the structure which touches (triangle | delta) part C reliably.
[0018]
[Another embodiment]
Another embodiment will be described below.
In the previous embodiment, a configuration in which three pairs of magnets are provided has been described. However, one pair may be used from the viewpoint of the manufacturing process and cost, or a plurality of pairs may be formed from the viewpoint of the certainty of magnetic attachment.
[Brief description of the drawings]
[Fig. 1] Longitudinal side view of the drilling tool [Fig.2] Vertical side view showing the gas pipe drilling operation process [Fig.3] Contact surface side plan view of the abutting member [Fig.4] [Figure 5] Overall side view showing the installation status of bypass pipes [Explanation of symbols]
2 Tube 6 Blade 8 Cut piece 9 Cut piece holding mechanism A Contact member 15 Magnet 7 Cutting edge B1 Hole C Δ part

Claims (1)

A cut-off piece holding mechanism (9) for holding a cut-off piece (8) cut by the blade (6) is provided with a cylindrical blade (6) that can be cut into the steel pipe (2). A pipe drilling method for drilling an iron pipe (2) using a punch provided in the blade (6),
A drilling step of drilling so as to connect two circular holes (B1) in series;
A contact member having a contact surface that can freely contact the workpiece (8) is disposed in the blade body (6) so that it can be moved back and forth with respect to the blade body (6), and The cutting target piece is provided so as to be relatively rotatable around the axis of the blade body (6), and at least a pair of magnets disposed at positions facing each other in the radial direction of the blade body on the periphery of the contact surface. A holding mechanism (9) is formed, the contact member is formed in a disk shape, and a punching tool whose contact surface is formed in a shape along the concave spherical surface is used to form the contact member (A). The contact surface and the blade edge portion (7) of the blade body (6) are brought into contact with the two Δ portions (C) generated between the two hole portions (B1), and the blade body (6 ) Cutting the Δ part (C) by
A tube drilling method including a step of taking out the Δ part (C) held by the workpiece holding mechanism (9) from the tube (2) together with a punch.

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