JP4189935B2 - Drilling method of fluid pipe and recess forming apparatus for drilling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for drilling a fluid pipe in which a through hole is provided in a fluid pipe such as a water pipe or a gas pipe in the direction from the outer surface to the inner surface, and a drilling recess forming apparatus used during drilling.
[0002]
[Prior art]
As a method of providing the through hole P1 in the fluid pipe P, for example, the one shown in FIG. 4 is known. The case body A is attached to the fluid pipe P, and the work pipe provided above the work pipe portion B of the case body A A perforator D is attached to the gate valve C.
[0003]
The drilling machine D is provided with a cylindrical hole saw E having a cutting edge E1 formed at the tip thereof so as to be rotatable and movable back and forth. At the center of the hole saw E, a center drill F cuts the tip of the hole saw E. It protrudes from the blade E1 and is attached.
[0004]
The working gate valve C includes a valve body C1 that blocks the flow path, an operating rod C2 that moves the valve body C1 back and forth, and a flange portion C3 for connection.
[0005]
In order to provide the through hole P1 in the fluid pipe P, the hole saw E of the punching machine D is rotated while being sent to the outer periphery of the fluid pipe P and brought into contact with the fluid pipe P.
[0006]
[Problems to be solved by the invention]
In such a drilling method of the fluid pipe P, the center drill F first comes into contact with the outer surface of the fluid pipe P and bites into the pipe wall, and after the position is determined, the hole is drilled by the hole saw E. Is formed in a cylindrical shape, and a minute flat portion is provided at the tip of the center drill F, so that the center drill F is perpendicular to the tube axis before the first point-like hole is formed. It may slip and deviate from the predetermined position.
[0007]
Since the hole saw E forms the through-hole P1 based on the center drill F, the position of the through-hole P1 is also shifted when the center drill F is removed from a predetermined position.
[0008]
If the center of the work tube portion B and the through hole P1 is shifted, in the case of branching, there is a problem that the loss head increases and the flow rate decreases, and the rust-proof core cannot be inserted into the through hole P1. In the case of the shut-off valve device that stops the flow of the fluid pipe by inserting the valve body, there are problems that the valve body cannot be inserted or that the inserted valve body cannot be pulled out. In some cases, the hole saw E may be damaged.
[0009]
The problem to be solved by the present invention has been made in order to solve the above-described problem, and a method for drilling a fluid pipe capable of reliably providing a through-hole at a predetermined position of the fluid pipe, and for drilling used at the time of drilling. It is in providing a recess forming device.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the method for perforating a fluid pipe according to the present invention is the continuous water in which a work pipe portion, a work gate valve and a hole saw are attached to an existing fluid pipe, and a through hole is formed in the fluid pipe with the hole saw. a drilling process, the hole saw installed previously, the laminated body extending above the working tube section, fitted with a recess forming means concentrically with the working pipe section, guide socket so as not to leak the fluid by the recess-forming means Is formed in the fluid pipe, and a hole drill is drilled by engaging a center drill with the guide recess.
This feature makes it possible to determine the proper approach direction of the hole saw in the dry state before drilling the fluid pipe with the hole saw, so that the fluid pipe can be drilled according to various requirements, and the hole saw can be damaged. Accidents can be prevented.
[0011]
Further , since the guide recess is formed on the outer surface of the fluid pipe by the recess forming means attached concentrically with the work tube portion, the center drill engages with the guide recess formed at the same position as the center of the work tube portion. Therefore, since it is guided to the center of the working tube portion, it does not slip out of the surface of the fluid tube in the direction perpendicular to the tube axis. Therefore, the through hole is formed at a predetermined position by the hole saw with the center drill guided to the center of the working tube portion as the center.
[0012]
According to the fluid pipe drilling method of the present invention, the recess forming means includes a support member attached to the laminate at least concentrically with the working pipe part, and a sharp tip drill attached to the support member so as to be rotatable and movable back and forth. It is preferable that it is comprised from these.
By doing so, the guide recess is formed by a sharp drill provided at the support member installed concentrically with the work tube, so the guide recess is surely formed at the same position as the center of the work tube, Since the center drill engaged with the guide recess is guided concentrically with the work tube portion, a through hole can be provided at a predetermined position concentric with the work tube portion by a hole saw around the center drill.
[0013]
A perforation recess forming apparatus according to the present invention is an apparatus that is attached to a laminated body that extends above a work tube portion mounted on a fluid pipe and that forms a guide recess on the outer surface of the fluid pipe. It is preferable that the support member is concentrically mounted, and a drill having a sharp tip attached to the support member so as to be able to rotate and advance and retract.
By doing in this way, the recess forming device is composed of a support member that is concentrically attached to the work tube portion, and a sharp drill that is attached to the support member so as to be able to rotate and advance and retract. Since the guide recess can be formed at the same position as the center of the work tube by a sharp drill installed concentrically with the work tube, the center drill is reliably guided to a predetermined position by the guide recess, A through hole can be provided at an accurate position.
[0014]
It is preferable that the drill is fixed to a support member and provided inside a stable cylindrical member extending in a fluid pipe direction.
By doing so, since the stable cylindrical member extends in the direction of the surface of the fluid pipe, the distance between the portion supporting the drill and the surface of the fluid pipe provided with the guide recess is reduced, and the drill is stable. As a result, the accuracy of the position where the guide recess is formed is increased, and the position of the through hole is more accurate.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
In the embodiment of FIG. 1, a case body 2 is attached to a fluid pipe 3, and a work gate valve 4 (laminated body) is attached to an upper part of a work pipe portion 2 a connected to the case body 2. The recess forming device 1 is loaded.
[0017]
The recess forming apparatus 1 includes a support member 5 attached to the work gate valve 4, a stable cylinder member 6 fixed to the support member 5 and extending in the direction of the fluid pipe 3, and rotating inside the stable cylinder member 6. It is comprised by the drill 7 supported so that advancement / retraction was possible.
[0018]
The support member 5 is formed in a circular shape in plan view, and a through hole 5a through which the drill 7 penetrates is provided at the center, and a bolt 6e for fixing the stable cylinder member 6 on a concentric circle centering on the through hole 5a. A fixing hole 5b is formed in which is inserted. A convex portion 5c that engages with the alignment concave portion 4b of the work gate valve 4 is formed on the lower surface of the support member 5, and a grip member 5d is attached to the upper surface.
[0019]
The stable cylinder member 6 is provided with a hole through which a drill 7 penetrates at the center, a fixed plate 6b formed with a female screw portion 6c opposed to the fixed hole 5b, and a fixed plate 6b. It is comprised with the cylindrical part 6a in which the support hole 6d which can be supported so that rotation and advancement / retraction is possible was carried out, and it is being fixed to the support member with the volt | bolt 6e.
[0020]
The drill 7 includes a drill body 7a having a guide recess on the surface of the fluid pipe, a shaft 7b that supports the drill body 7a, and a nut 7c that fixes the drill body 7a to the shaft 7b. As shown in FIG. 2, an attachment hole 7f into which the drill body 7a is inserted is formed at one end of the shaft 7b, a slit 7g is provided at the end, and a male screw portion 7d into which a nut 7c is screwed at the outer peripheral portion. Is provided.
[0021]
When the drill body 7a is inserted into the mounting hole 7f and the nut 7c is screwed into the male screw portion 7d and tightened, the slit 7g is provided, so that the tip end portion of the shaft 7b is bent and the drill body 7a is chucked. An attachment portion 7e for attaching a handle for rotating the drill 7 is formed at the other end portion. In order to give rotation to the drill 7, a handle may be attached and the drill 7 may be rotated by hand, or an electric rotating machine may be attached and mechanically turned.
[0022]
The case body 2 is divided into two parts for attachment to the fluid pipe 3, and is attached by bolts and nuts (not shown), and one case body 2 is provided with a work pipe portion 2a. At the end of the work tube portion 2a, an alignment convex portion 2b is formed by processing the same inner diameter and center of the work tube portion 2a.
[0023]
The working gate valve 4 can shut off the flow from the fluid pipe 3 by inserting and removing a valve element (not shown), and mounting flanges 4a are provided at both ends. An alignment recess 4b that engages with the alignment protrusion 2b is formed inside the mounting flange 4a.
[0024]
The work pipe portion 2a and the work gate valve 4 are attached by engaging the alignment convex portion 2b and the alignment concave portion 4b, and the work gate valve 4 and the concave portion forming apparatus 1 are provided with the alignment concave portion 4b and the convex portion. The recess forming apparatus 1 is attached with the same center as that of the work tube portion 2a.
[0025]
In the above embodiment, the laminated body attached to the work pipe portion 2a is the work gate valve 4, but an adjustment flange for attaching the gate valve device and the recess forming device to the work pipe portion 2a is also stacked as a laminated body. In some cases.
[0026]
A drilling method according to this embodiment will be described with reference to FIG.
[0027]
First, as shown in (a), the case body 2 is attached to the fluid pipe 3 in a watertight manner, the work gate valve 4 is loaded on the upper part of the work pipe portion 2a of the case body 2, and the upper side of the work valve gate valve 4 is placed. The recess forming device 1 is installed on the mounting flange 4a.
[0028]
The work gate valve 4 and the recess forming device 1 are attached so as to be concentric with the center of the inner diameter of the work pipe portion 2a, and the valve body 4c of the work gate valve 4 is operated in an open state to form a recess. The cylindrical portion 6a of the stable cylindrical member 6 of the apparatus 1 is extended to the vicinity of the outer surface of the fluid pipe 3 so that the drill 7 does not run out.
[0029]
Next, a guide recess is formed at a position coinciding with the center of the inner diameter of the working tube portion 2a by rotating the drill 7 whose tip is in contact with the outer surface of the fluid tube 2.
[0030]
The guide recess is formed in a shallow hole shape on the surface of the fluid pipe 3 by the drill body 7a.
[0031]
When the formation of the guide recess is finished, the recess forming device 1 is removed from the mounting flange 4a of the work gate valve 4 as shown in FIG. Install.
[0032]
A center drill 10 is provided at the center of the hole saw 9 so that the tip protrudes from the hole saw 9.
[0033]
Next, as shown in (c), the hole saw 9 is sent out from the drilling machine 8 in the direction of the fluid pipe, and the center drill 10 is brought into contact with the guide recess formed by the recess forming apparatus 1. The center drill 10 is further fed out while rotating and penetrates the pipe wall of the fluid pipe 3.
[0034]
Since the center drill 10 is in contact with the guide recess, the center drill 10 does not escape in the direction perpendicular to the tube axis or the like, and penetrates at the same position as the center of the inner diameter of the working tube portion 2a.
[0035]
Subsequent to the penetration of the center drill 10, the fluid pipe 3 is perforated by the hole saw 9, as shown in (d).
[0036]
Since the center drill 10 penetrates at the same position as the center of the inner diameter of the work tube portion 2a and becomes the center of rotation, the through hole 11 drilled by the hole saw 9 is formed concentrically with the inner diameter of the work tube portion 2a. The
[0037]
When the drilling by the hole saw 9 is completed, as shown in FIG. 5 (e), the hole saw 9 in which the section 12 is housed is pulled back to the punching machine 8, the valve body 4c of the work gate valve 4 is closed and the hole saw 4 flows out from the through hole 11. Shut off the water to be used.
[0038]
Finally, as shown in (f), the punching machine 8 is removed from the mounting flange 4a of the work gate valve 4, and the drilling operation is completed.
[0039]
According to the drilling method of the present invention, a guide recess is formed on the outer surface of the fluid pipe by a recess forming device attached concentrically with the work pipe, and a center drill is brought into contact with the guide recess and penetrated into the fluid pipe with a hole saw. Since the hole is provided, the center drill engages with the guide recess and is guided to the center of the work tube portion, so that the position of the hole saw is also shifted without slipping on the surface of the fluid tube and moving in the direction perpendicular to the tube axis. Since there is no such thing, the through hole is formed at a predetermined position.
[0040]
While the embodiments of the present invention have been described with reference to the drawings, the specific configuration of the present invention is not limited to this.
[0041]
【The invention's effect】
According to the first aspect of the present invention, since the proper approach direction of the hole saw can be determined in a dry state before the fluid pipe is drilled with the hole saw, the fluid pipe can be drilled according to various demands. Unexpected accidents such as damage can be prevented.
[0042]
Further , since the guide recess is formed on the outer surface of the fluid pipe by the recess forming means attached concentrically with the work tube portion, the center drill engages with the guide recess formed at the same position as the center of the work tube portion. Therefore, since it is guided to the center of the working tube portion, it does not slip out of the surface of the fluid tube in the direction perpendicular to the tube axis. Therefore, the through hole is formed at a predetermined position by the hole saw with the center drill guided to the center of the working tube portion as the center.
[0043]
According to the second aspect of the present invention, the guide recess is formed by the sharp tip drill provided in the support member installed concentrically with the work tube portion, so the guide recess is surely formed at the same position as the center of the work tube portion. Since the center drill engaged with the guide recess is guided concentrically with the work tube portion, the through hole can be provided at a predetermined position concentric with the work tube portion by a hole saw with the center drill as the center.
[0044]
According to invention of Claim 3 , the recessed part formation apparatus is comprised from the supporting member attached concentrically with a work pipe part, and the sharp drill which was attached with respect to the said supporting member so that rotation and advancing and retreating were possible. Therefore, since a guide recess can be formed at the same position as the center of the work tube portion by a sharp drill installed concentrically with the work tube portion, the center drill is reliably guided to a predetermined position by the guide recess, A through hole can be provided at an accurate position by a hole saw.
[0045]
According to the invention of claim 4 , since the stable cylindrical member extends in the surface direction of the fluid pipe, the distance between the portion supporting the drill and the surface of the fluid pipe provided with the guide recess is reduced. Therefore, the accuracy of the position of the guide recess formation is increased, and the position of the through hole becomes more accurate.
[0046]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the present invention.
FIG. 2 is a partially enlarged view of the shaft.
FIG. 3 is also an explanatory view of a drilling method. FIG. 4 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concave formation apparatus 2 Case body 2a Work pipe part 2b Positioning convex part 3 Fluid pipe 4 Work gate valve (laminated body)
4a Mounting flange 4b Alignment recess 4c Valve body 5 Support member 5a Through hole 5b Fixing hole 5c Protruding part 5d Holding member 6 Stable cylinder member 6a Cylindrical part 6b Fixing plate 6c Female thread part 6d Support hole 6e Bolt 7 Drill 7a Drill body 7b Shaft 7c Nut 7d Male threaded portion 7e Mounting portion 7f Mounting hole 7g Slit 8 Drilling machine 9 Hole saw 10 Center drill 11 Through hole 12 Section

Claims (4)

A continuous water drilling method in which a working pipe, a working gate valve, and a hole saw are attached to an existing fluid pipe, and a through hole is formed in the fluid pipe with the hole saw, before the hole saw is installed , the laminated body extending, fitted with a recess forming means in concentric working tube portion, a guide socket so as not to leak the fluid formed in the fluid pipe by said recess forming means, engaging the center drill of the hole saw to the guide socket A method for perforating a fluid pipe in which perforations are performed together. Said recess forming means, according to claim 1 which is composed of a support member attached to the laminate concentric with at least a working tube portion, and the rotation and retractably mounted tip sharp drill with respect to the support member For drilling fluid pipes.   An apparatus for forming a guide recess on an outer surface of a fluid pipe, which is attached to a laminate extending above a working pipe portion mounted on the fluid pipe, and at least a support member attached concentrically with the working pipe portion, the support A drilling recess forming apparatus comprising a drill with a sharp tip attached to a member so as to be rotatable and reciprocating. The drilling recess forming apparatus according to claim 3 , wherein the drill is provided inside a stable cylindrical member that is fixed to a support member and extends in a fluid pipe direction.

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