JP2001009622A - Forming method for branch port without suspending water and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a branch port having an optional diameter in an existing pipe by inserting a cutting blade in the existing pipe, and forming the branch port by moving a cutting means with an inserting position as a starting point. SOLUTION: A cutting means 4 is positioned in a branch position (a position for forming a branch port) by rotating an enclosing body 3 by an arm. Afterwards, a rotary main spindle 12 of the cutting means 4 is moved in the diametrical inside direction of an existing pipe 2 simultaneously with rotation, and a part of the existing pipe 2 is cut and penetrated by a cutting blade 13. Next, the arm properly moves the enclosing body 3 in the peripheral direction and the shaft direction of the existing pipe 2 according to a program preset in a control device. An almost annular ring-shaped cutting hole is formed in the existing pipe 2 by leaving a part by moving the cutting means 4 with an inserting position for inserting the cutting blade 13 as a starting point. At this time, a circular cut piece is formed by the cutting blade 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a non-water-discharge branch port which can connect a branch pipe without interrupting water to an existing pipe.

[0002]

2. Description of the Related Art Conventionally, when forming a branch pipe of this type, the branch pipe is formed in a part of the existing pipe by cutting means, and then the branch pipe is connected to the existing pipe so as to communicate with the branch port. Connected.

[0003]

However, the conventional means for forming a continuous water branch pipe has a branch port formed in the existing pipe by inserting a rotating cutting blade of the cutting means into the existing pipe. A cutting tool having a cutting blade having a diameter corresponding to the diameter of the cutting tool is required. For this reason, a large-diameter cutting blade must be used, and there is a problem that the cost increases. In addition, there is a limit on the diameter of the formed branch port.

[0004] In view of the above problems, an object of the present invention is to make it possible to form a branch port having an arbitrary diameter in an existing pipe by an inexpensive cutting means.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made as a method and a device for forming a continuous water branching port. 2 is a method for forming a water-free branching port, wherein a cutting blade 13 is inserted into the existing pipe 2 and the cutting means 4 is moved starting from the insertion position to form the branching port D. It is in.

According to a second aspect of the present invention, there is provided a method for forming a continuous water branch port for forming a branch port D in an existing pipe 2, wherein a cutting blade 13 is inserted into the existing pipe 2. By moving the cutting means 4 starting from the insertion position,
The object of the present invention is to form the cutting hole A in an annular shape while leaving a part C, and remove the section B surrounded by the cutting hole A to form the branch port.

According to a third aspect of the present invention, there is provided a method of forming a continuous water branch port for forming a branch port D in an existing pipe 2, wherein a cutting blade 13 is inserted into the existing pipe 2. The branch port is formed by moving the cutting means 4 in an annular shape with the insertion position as a starting point.

According to a fourth aspect of the present invention, there is provided a method for forming a water-free branching port for forming a branching port D in an existing pipe 2, wherein the cutting blade 13 is provided in an axial direction and a circumferential direction of the existing pipe 2. To form the branch port D by moving in the direction.

According to a fifth aspect of the present invention, there is provided an apparatus for forming a continuous water branch port for forming a branch port D in an existing pipe 2, wherein the cutting means 4 includes a rotating cutting blade 13.
Moving means for inserting the cutting blade 13 into the existing pipe 2 and moving the cutting means 4 with the insertion position as a starting point, thereby forming the cutting hole A in an annular shape leaving a part C; A removing means for removing the section B surrounded by A.

According to a sixth aspect of the present invention, there is provided an apparatus for forming a continuous water branch port for forming a branch port D in an existing pipe 2, wherein the cutting means 4 includes a rotating cutting blade 13.
The cutting blade 13 is inserted into the existing pipe 2 and the cutting means 4 is moved from the insertion position as a starting point, so that the branch port D
And moving means for forming

An apparatus for forming a continuous water branch port according to a seventh aspect of the present invention is an apparatus for forming a continuous water branch port for forming a branch port D in an existing pipe 2, wherein the cutting means 4 has a rotating cutting blade 13.
And a moving means for forming the branch port by inserting the cutting blade 13 into the existing pipe 2 and moving the cutting means 4 in a ring starting from the insertion position.

Therefore, since the branch port D to be formed on the peripheral surface of the existing pipe 2 is formed so as to follow the trajectory of the cutting means 4, a large-diameter cutting blade is not required unlike the conventional art, and a small-diameter cutting blade is required. A cutting blade may be used, it is inexpensive, and a branch port D having an arbitrary shape and diameter can be formed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> Figs. 1 to 5 show a first embodiment of the present invention, in which 1 is an apparatus for forming a non-water supply branch, for example, in a part of an existing pipe 2 buried underground. An exterior body 3 to be externally fitted is provided. A cutting means 4, a piece removing means 5, and a butterfly valve device 6 as a valve device are attached to the outer body 3 on the same circumference (in the circumferential direction of the existing pipe 2).

As shown in FIG. 1, the exterior body 3 includes a first divided body 3a and a second divided body 3b.
A packing (not shown) pressed against the peripheral surface of the existing pipe 2 is interposed on the inner peripheral surface of the flange portions a and 3b. Therefore, the inside of the exterior body 3 becomes watertight by the packing. The exterior body 3 is provided rotatably in the circumferential direction of the existing pipe 2 and is provided movably in the axial direction of the existing pipe 2.

The cutting means 4 is provided with a working gate valve 9 on a flange portion 8 of a mounting portion 7 protruding from the first divided body 3a.
Is mounted via. In addition, a drain hole 10 for discharging cutting chips and water at the time of cutting by the cutting means 4 is formed in the mounting portion 7.

The cutting means 4 has a structure similar to a well-known hole saw type non-water piercing machine, and has a cylindrical cutting means main body 11 attached to a work separating valve 9 and a shaft of the cutting means main body 11. And a rotating spindle (cutting tool) 12 provided so as to be reciprocally movable in the directions. A small-diameter cutting blade 13 is provided at the tip of the rotary spindle 12, and the rotary spindle 12 can be reciprocated and rotated by driving means (not shown).

A blocking member 14 is mounted on the rear end side of the cutting blade 13 at the tip of the rotary spindle 12. This blocking member 14
A brush (not shown) is radially provided on the peripheral surface of the blocking member 14 so as to prevent cutting chips from flowing out to the insertion hole 7 a side of the existing pipe 2 and the mounting portion 7. The diameter is larger than the inner diameter of the inner peripheral surface of the insertion hole 7a.

As shown in FIGS. 1 and 2, the section removing means 5 includes a cylindrical portion 16 having a section storing recess 15 formed near the mounting portion 7 of the cutting means 4; A moving shaft 18 is inserted through a cylindrical seal member 17 and is reciprocally movable, a cap nut 19 rotatably attached to an end of the seal member 17, and penetrates the seal member 17 and the cap nut 19. A nut 21 is screwed into a screw 20 at the end of the moving shaft 18 and a cut-out portion 23 provided at the other end of the moving shaft 18.

The section outside 23 has a moving shaft 1 at the center.
8, a bent piece 23b formed on both sides of the board 23a, and a locking piece 25 rotatably provided via a pin 24 at the tip of the bent piece 23b. Consists of The locking piece 25 is urged in the opening direction by a spring (not shown).

The cap nut 19 is rotatable with respect to the moving shaft 18 and is relatively movable in the axial direction. Also,
The seal body 17 cannot rotate with respect to the cylindrical portion 16 via the key 17a and is movable in the axial direction of the cylindrical portion 16.
Reference numeral 22 denotes an O-ring, and the O-ring 22 ensures watertightness of the section removing means 5.

The butterfly valve device 6 is mounted on a flange portion 30 of a mounting portion 29 provided on the second divided body 3b.

Next, a method of forming a branch pipe will be described. First, as shown in FIG.
The first divided body 3a and the second divided body 3b of the exterior body 3 are attached with the assembly bolts B and the nuts N while the air flows. At this time, the waterproofness of the exterior body 3 is ensured by the packing mounted on the two divided bodies 3a and 3b.

After the exterior body 3 is mounted on the existing pipe 2, the cutting means 4 is mounted on the mounting portion 7 of the first divided body 3a, and the butterfly valve device 6 is mounted on the mounting portion 29.

Next, as shown in FIG. 7, the control device P controls the movement of the exterior body 3 in the existing pipe circumferential direction and in the axial direction. That is, annular extending portions 3a are provided at both ends of the exterior body 3, and the pair of gripping portions 38 provided at the distal end of the arm 37 of a robot or the like grip the two extending portions 3a. The moving means is constituted by the arm 37 including the grip portion 38 and the control device P.

Then, the arm 37 rotates the exterior body 3 to position the cutting means 4 at the branch position (position at which a branch port is formed) S. Thereafter, the rotating main shaft 12 of the cutting means 4 is rotated and simultaneously moved in the radial direction of the existing pipe 2, and a part of the existing pipe 2 is cut and penetrated by the cutting blade 13 (FIGS. 1 and 4 ( B)).

Next, according to a program preset in the control device P, the arm 37 appropriately moves the exterior body 3 in the circumferential direction and the axial direction of the existing pipe 2. By moving the cutting means 4 with the insertion position where the cutting blade 13 is inserted as a starting point, a substantially annular cutting hole A is formed in the existing pipe 2 while leaving a part C. At this time, a substantially circular section B is formed by the cutting hole A (see FIG. 4B).

When cutting the existing pipe 2 by the cutting blade 13, most of the cutting chips are prevented from entering the existing pipe 2 by the water pressure due to the water pressure overflowing from the cutting hole A.
Most of the cuttings are discharged from the drain hole 10 to the outside.

After the cutting hole A is formed, the drain hole 10 is closed by a plug (not shown), the rotating main shaft 12 is retracted to a predetermined position, and inserted through the valve body 9a of the working partition valve 9. The hole 7a is closed.

Next, as shown in FIG.
Rotate 5 degrees in the direction of the arrow to position the axis of the section removing means 5 at the branch position. Then, the cap nut 19 of the section removing means 5 is screwed into the cylindrical portion 16, and the moving shaft 18 is also moved in the axial direction of the existing pipe so that the locking piece 25 is inserted into the cutting hole A. When the locking piece 25 is inserted into the cutting hole A, the locking piece 25 comes into contact with the peripheral surface of the cutting hole A and is pressed into the bent piece 23b against the spring to be in a closed state. And
When the locking piece 25 passes through the cutting hole A, the locking piece 25 is opened by a spring, and the locking piece 25 is locked on the back surface of the section B (see FIG. 4B).

From this state, the nut 21 is rotated to move the moving shaft 18 in the radial direction of the existing pipe 2, the section B surrounded by the cutting hole (A) is removed from the existing pipe 2, and the branch port D is opened. (See FIG. 4C). The section B is stored in the section storing recess 15.

Thereafter, the exterior body 3 is rotated, the butterfly valve device 6 is positioned at the branch position, and the branch pipe 36 is attached with the bolt B and the nut N as shown in FIG. Then, by opening the butterfly valve device 6, the water flowing in the existing pipe 2 can be branched and flown to the branch pipe 36. The cutting means 4 may be removed from the exterior body 3 before rotating the exterior body 3 to position the butterfly valve device 6 at the branch position, or may be removed after rotating the exterior body 3.

As described above, the annular cutting hole A is formed in the peripheral surface of the existing pipe 2, and the section B surrounded by the cutting hole A is taken out by the section removing means.
Despite being 3, a large diameter branch port D can be easily formed. Moreover, the butterfly valve 6 is provided at the branch port D.
The branch pipe can be easily formed simply by rotating and positioning the pipe.

Further, since the outer casing 3 is moved in the circumferential direction and the axial direction of the existing pipe 2 by the control device P,
Work steps up to positioning of the cutting means, formation of the branch port D, and positioning of the butterfly valve device can be automated.

In the first embodiment, the shape of the cutting hole A is annular, but may be annular as shown in FIG. Further, a part C of the existing pipe 2 when forming the cutting hole A is not limited to a single part and may be plural. Further, the number of the cutting holes A and the part C of the existing pipe 2 is not limited to one, but may be plural.

<Second Embodiment> Next, a second embodiment will be described with reference to FIG. A different point from the first embodiment is that the section removing means 5 does not previously form an annular cutting hole A to leave the section B, and the cutting blade 13 turns all of the chips into cutting chips.

For example, as shown in FIG. 1A, first, one cutting hole A1 is formed, and then the outer body 3 is moved in the circumferential direction of the existing pipe 2 and by the means shown in the first embodiment. By moving in the axial direction, an annular annular cutting hole D is formed as shown in FIG.

Further, as shown in FIG. 3C, when the diameter of the cutting blade is equal to or more than の of the diameter (width length) of the branch port D to be formed, it is necessary to pierce the center of the branch port D. The outer body 3 is moved in the circumferential direction and the axial direction of the existing pipe 2 to sequentially drill four corners of the branch port D. This embodiment has the advantage that the section removing means 5 is not required, and the apparatus can be reduced in size and the cost can be reduced.

Further, as shown in FIG. 9, the rotating cutting blade 13 of the cutting means 4 is inserted into the existing pipe 2, and the cutting means 4 is moved in an annular shape with the insertion position as a starting point, thereby obtaining the branch port D. May be formed.

The cutting means 4 is first moved by moving the cutting blade 13 in the axial direction of the existing pipe 2 to penetrate the existing pipe 2 and then retreating the cutting blade 13 and removing the cutting blade 13 from the existing pipe 2. And separate them. Next, the cutting means 4 is moved to an arbitrary position, and the cutting blade 13 is moved again in the axial direction of the existing pipe 2 to penetrate the existing pipe 2. This operation may be repeated several times to form the branch port D in the existing pipe 2.

The present invention is not limited to the above embodiment. For example, the moving means for moving the cutting blade (13) in the axial direction and the circumferential direction of the existing pipe (2) may be a manual means such as a winch. Alternatively, it may be an electric tool, and is not particularly limited.

The existing pipe can be applied not only to a water pipe but also to a gas pipe and the like. That is, the fluid flowing through the existing pipe 2 is not limited to water but may be any other fluid such as gas or oil, which is included in the scope of the present invention.

[0042]

As described above, according to the method for forming a water-free branch port of the present invention, the branch port to be formed on the peripheral surface of the existing pipe can be formed following the trajectory of the cutting means. . Therefore, unlike the related art, there is no need to form the branch port by using a large-diameter cutting blade, so that the size of the cutting blade is reduced and the cost is reduced.

Furthermore, a branch port of any shape and diameter can be formed irrespective of the diameter of the cutting blade, which is optimal for forming a large-diameter branch port.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of an embodiment of the present invention.

FIG. 2 is a sectional front view of a section removing means.

FIG. 3 is a cross-sectional front view illustrating a state where a section of an existing pipe is removed.

FIGS. 4A and 4B show each step of cutting hole processing, wherein FIG. 4A is a partial cross-sectional side view showing a state where a cutting blade is inserted into an existing pipe, and FIG. 4B is a partial cross section showing a state where a section is removed by a section removing means. Side view,
(C) is a side view of a state where a cutting hole is formed in an existing pipe.

FIG. 5 is a cross-sectional front view showing a state where a branch pipe is connected to a butterfly valve device by rotating an exterior body.

FIG. 6 is a view showing a modified example of a cutting hole.

FIG. 7A is a schematic side view in which the arm is moved in the circumferential direction and the axial direction of the existing pipe by controlling the arm to form a branch port in the existing pipe, and FIG. .

FIG. 8 shows a second embodiment of the present invention, wherein (a) is a side view showing a step of forming a branch port using a small-diameter cutting blade,
(B) is a side view of the same, (C) is a side view showing a cutting hole formed in the existing pipe.

9A is a partial cross-sectional side view showing a step of forming a branch port using a small-diameter cutting blade, and FIG. 9B is a side view showing a cutting hole formed in an existing pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Uncontinuous water branch piping apparatus 2 ... Existing pipe 3 ... Exterior body 4
... cutting means, 5 ... section removing means, 6 ... valve device, 13
... cutting blade, 36 ... branch pipe, A ... cutting hole, B ... section, D ...
Fork.

Claims (7)

[Claims] 1. A method of forming a water-free branch port for forming a branch port (D) in an existing pipe (2), wherein a cutting blade (13) is inserted into the existing pipe (2), and the insertion position is defined as a starting point. And forming a branch (D) by moving the cutting means (4). 2. A method for forming a water-free water branch port for forming a branch port (D) in an existing pipe (2), wherein a cutting blade (13) is inserted into the existing pipe (2), and the insertion position is defined as a starting point. By moving the cutting means (4), the cutting hole (A) is formed in an annular shape except for a part (C), and the section (B) surrounded by the cutting hole (A) is removed. A method for forming a branch port, comprising forming a branch port. 3. A method of forming a water-free branch port for forming a branch port (D) in an existing pipe (2), wherein a cutting blade (13) is inserted into the existing pipe (2), and the insertion position is defined as a starting point. And forming the branch port by moving the cutting means (4) in an annular shape. 4. A method for forming a water-free branch port for forming a branch port (D) in an existing pipe (2), wherein a cutting blade (13) is moved in an axial direction and a circumferential direction of the existing pipe (2). Thereby forming a branch port (D). 5. An apparatus for forming a water-free branch port for forming a branch port (D) in an existing pipe (2), comprising a rotating cutting blade (1).
A cutting means (4) having 3) and a cutting blade (13) are inserted into the existing pipe (2), and the cutting means (4) is moved starting from the insertion position to partially (C). A branch port provided with moving means for forming a cutting hole (A) in an annular shape while leaving, and section removing means (5) for removing a section (B) surrounded by the cutting hole (A). Forming equipment. 6. An apparatus for forming a water-free branching port for forming a branching port (D) in an existing pipe (2), comprising: a rotating cutting blade (1).
An apparatus for forming a branch port, comprising: cutting means (4) having 3); and moving means for moving the cutting blade (13) in the axial direction and the circumferential direction of the existing pipe (2). 7. An apparatus for forming a waterless branch port for forming a branch port (D) in an existing pipe (2), comprising a rotating cutting blade (1).
A cutting means (4) having a cutting edge (3) is inserted into the existing pipe (2), and the cutting means (4) is moved in an annular shape with the insertion position as a starting point, whereby the branch opening (D) is formed. And a moving means for forming the branch opening.