JPH11141780A - Branch joint mounting device for existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch joint mounting device which enables formation of a hole in a pipeline without causing bursting of a lining and which is so constructed to be able to enhance operability. SOLUTION: This device has a downwardly-pointed, cup-shaped rotatable blade 12 opposed to a part where a branch opening is to be formed, and has a lining pressing means 13 mounted in the position of the center of rotation of the blade 12 and having an end projected from the lower end of the blade 12. The lining pressing means 13 can press the surface of a lining while keeping its end immobile regardless of the rotation of the blade 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for attaching a branch joint to an existing pipeline, and more particularly, to a drilling operation for attaching a branch joint to an existing pipeline having a lining material such as a tube interposed on an inner surface thereof. It relates to the equipment used.

[0002]

2. Description of the Related Art Pipes for flowing a fluid such as a gas include:
There is a structure in which a lining material such as a fiber-reinforced polyethylene tube is interposed on the inner surface of a cast iron pipe or a steel pipe to take repair and maintenance measures. On the other hand, the above-mentioned pipeline may be provided with a branch part as needed, and a new pipeline may be connected to the branch part to form a branch pipe. As shown in FIG. 5, the existing pipeline 1
In the case where a branch portion is formed, there is the following operation as an example. First, only the peripheral wall is cut out at the corresponding location of the branch portion 1A in the existing pipeline 1 to expose the lining material 2. Next, a branch saddle 3 corresponding to a branch joint made of polyethylene resin is fused to the exposed lining material 2, and an opening 2 </ b> A is formed in the lining material 2 at a position facing the branch saddle 3. By connecting the branch pipe 4, the existing pipeline 1 and the branch pipe 4 are communicated. In the operation for forming the branch portion, there is a perforation for exposing the lining material 2. Conventionally, as one of the operations for forming the perforation, a plurality of blades such as end mills are revolved and rotated. However, there is a case where the cut is made at a stretch by inserting the pipe a little deeper than the thickness of the peripheral wall of the existing pipeline 1. In this case, it is necessary to keep the lining material 2 away from the inner surface of the existing pipeline 1 in order to prevent the lining material from being broken by the inserted blade. Therefore, conventionally, prior to the formation of a hole, a hole smaller than the hole is formed in advance,
As shown in FIG. 6, by separately inserting the pressing rod 5 into the inside from the small hole and abutting against the surface of the lining material 2, the lining material 2 is moved away from the inner surface of the existing pipeline 1 in accordance with the feed of the blade. That is being done.

[0003]

However, the above-mentioned perforation forming operation has the following problems. That is,
In order to prevent the lining material 2 from being damaged, it is necessary to separately insert a pressing rod 5 into the inside from a small hole and abut on the surface of the lining material 2 to move the lining material 2 away from the blade. It becomes complicated. Further, if the pressing rod 5 is interlocked with a blade such as an end mill, the tip of the pressing rod 5 rotates while being in contact with the surface of the lining material 2. Will be rubbed. Therefore, the surface of the lining material 2 becomes thinner than the other parts due to frictional heat,
This may break the excavated portion. In particular, since the lining material 2 tends to become thinner in accordance with the amount of expansion as it moves away from the inner surface of the existing pipeline 1 by being pressed by the pressing rod 5, the portion slid at the tip of the pressing rod 5 becomes even thinner. The problem that it becomes damaged is derived.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional branch joint mounting apparatus, the object of the present invention is to provide a structure capable of forming a hole in a pipeline without causing a rupture of a lining material and improving workability. To provide a branch joint mounting device.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a branch opening is formed in a part of an existing pipeline in which a lining material is attached, and a branch pipe is connected. A branch-coupling mounting device used in such a case, comprising a downwardly-rotating cup-shaped rotatable blade facing a portion forming the branch opening, and a tip provided at a rotation center position of the blade and protruding from a lower end of the blade. And a lining material pressing means having the following features. The lining material pressing means is capable of pressing the surface of the lining material while the tip thereof remains immovable regardless of the rotation of the blade.

According to a second aspect of the present invention, in the apparatus for attaching a branch joint of an existing pipeline according to the first aspect, the blade is provided with:
The drive shaft, which is penetrated to the upper surface, can be rotated integrally with the drive shaft, and the lining material pressing means is partially inserted into the drive shaft, and the insertion position is determined by a bearing member with respect to the drive shaft. It is characterized in that it is supported and maintained in a state where rotation of the drive shaft is not transmitted.

According to a third aspect of the present invention, in the apparatus for attaching a branch joint of an existing pipeline according to the first aspect, the lining material pressing means uses an extended portion of the drive shaft, and a tip of the extending portion of the surface of the lining material. A pressing portion is formed which is independent of a portion other than the tip of the drive shaft, and is kept immobile by a pressing force generated between the pressing portion and the lining material. And

[0008]

According to the first to third aspects of the present invention, since the blade facing the branch opening forming position of the conduit is a downward cup-shaped blade, it is not necessary to align the tips. In addition, the lining material pressing means located at the center of rotation of the blade can contact the surface of the lining material in an immobile state regardless of the rotation of the blade, so that the surface of the lining material does not interlock with the rotation of the blade. Does not generate frictional heat.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is an external view of a branch joint mounting apparatus according to an embodiment of the present invention. In the figure, a branch joint mounting apparatus 10 is an apparatus for forming an opening for mounting a branch joint in an existing pipeline, and has a motor inside. A cutting tool 12 connected to an output shaft 11A (see FIG. 2) of a motor block 11 and rotatable, and a lining material presser provided at a rotation center position of the cutting tool 12 and having a tip projecting from a lower end of the cutting tool 12 Means 13 and a blade moving means 16 for cutting and moving the motor block 11 by moving the motor block 11 back and forth in the axial direction are provided as main parts.

The motor block 11 has an electric motor inside, and its rotation is controlled by operating a switch (not shown) so that the output shaft 11A shown in FIG. 2 is rotated.

As shown in FIG. 2, the blade 12 has a downwardly cup-like cylindrical shape, and the lower edge forms a blade. In the present embodiment, the blade surface at the lower end edge has the same structure as the tooth surface of the groove milling machine. A boss 12A having a larger diameter than the output shaft 11A is formed on the upper surface of the blade 12, that is, the surface facing the motor block 11, and the output shaft 11A of the motor block 11 is formed on the inner surface of the boss 12A. It is fastened and integrated. Such a connection structure between the motor block 11 side and the blade 12 is to correspond to an assembling type of the lining material pressing means 13 to be described later, and in this embodiment, it will be described in detail later. Since the blade 12 is connected to the motor block 11 after the lining material pressing means 13 is assembled, the above-described fastening structure is used. Therefore, the blade 12 and the lining material pressing means 13
Depending on the type of assembly, the output shaft 11A and the blade 12 may be connected first.

The lining material pressing means 13 is formed by integrating an inner ring side and a base end of a needle bearing 14 which is inserted into an end of the boss portion 12A in an axial direction opposite to a fastening position with the output shaft 11A. The distal end corresponding to an end extending from the base end is configured by a rod member protruding from the lower end of the blade 12. The needle bearing 14 in the present embodiment is mounted on the lining material pressing means 13 by integrating the inner ring with the upper end of the lining pressing means 13, and is loaded into the boss 12 A of the blade 12. The outer ring is stopped by the lower end of the boss portion 12A so as not to fall off. The tip of the lining material pressing means 13 has a protrusion amount (amount indicated by reference numeral L in the drawing) slightly larger than the thickness of the peripheral wall of an existing pipeline (a member indicated by reference numeral 1 in FIG. 5) pierced by the blade 12. 12 is positioned at a position protruding downward from the lower end face, and has a cross-sectional shape in which the pressing area of the lining material (member indicated by reference numeral 2 in FIG. 5) is larger than the base end. In addition, it is preferable that the tip shape is a curved surface so that a bent portion at a sharp angle is not formed in the lining material 2 when the lining material 2 is pressed. The base end of the lining material pressing means 13 is a boss 12A.
A non-interference member 15 for preventing the influence of the rotation of the boss 12A from being transmitted to the base end is disposed in the gap with a slight gap.
In this embodiment, as the non-interference member 15, a low friction layer made of a fluororesin or the like or a rolling layer on which a plurality of balls are arranged is used.

Further, as another configuration of the lining material pressing means 13, as shown in FIG. 3, the lining material pressing means 13 is integrated with the blade 12, and a ball bearing 13A is attached to the tip of the lining material pressing means 13. Provided, regardless of the rotation of the lining material pressing means 13,
You may comprise so that only 3A may be immobile.

The blade moving means 16 is, as shown in FIG.
Feed drum 17 movable forward and backward in the axial direction of output shaft 11A
And a driving means 18 for controlling the movement of the feed drum 17. The feed drum 17 has a motor block 11 inserted therein, and a key groove on the inner peripheral surface of the feed drum 17 into which a key 11B formed on the outer peripheral surface of the motor block 11 can be fitted. A cam groove 17A having a shape through which the blade 12 can penetrate the peripheral wall of the existing pipeline 1 and a drum-side key 1
7B are formed. Further, on the upper surface of the feed drum 17, there is provided a lid formed with a hole through which the bolt 11 </ b> C implanted on the upper surface of the motor block 11 is inserted. It is arranged facing the lower surface.

The driving means 18 is a device for feeding the blade 12, and includes a driving gear 18A and an idle gear 18B.
And a feed drive worm gear 18C and a feed amount setting handle 18D. The drive gear 18A has a shape that allows the feed drum 17 to be inserted therein, and has a key groove 18A1 formed on an inner peripheral surface thereof, into which a drum-side key 17B of the feed drum 17 is fitted. The idle gear 18B includes a worm wheel 18B1 integrated with a driven gear that meshes with a drive gear formed of a spur gear.
The worm wheel 18B1 has a feed amount setting handle 18
Worm gear 1 for feed drive that rotates according to the rotation amount of D
8C is engaged.

As shown in FIG. 1, a cam groove 17A of the feed drum 17 is provided with a cam roller 19A provided in an upper body 19 which is an upper structure of the joint mounting device.
Are engaged as shown by reference symbol S. A hole is formed in the upper body portion 19 for inserting a bolt 11C of the motor block 11, and a nut 20 is rotatably attached to the bolt 11C. In FIG. 1, the nut 11C is shown above the feed drum 17 to clarify the positional relationship with the bolt 11C.

Since the present embodiment has the above configuration,
The motor block 11 is the feed drum 1 of the blade moving means 16
Key 11 which is inserted into the inside 7 and has on the motor block 11
The motor block 11 is linked to the rotation of the feed drum 17 by fitting B into the cam groove 17A in the feed drum 17. The feed drum 17 is inserted into the drive gear 18A of the drive means 18, and the drum-side key 17B is fitted into the key groove 18A1 of the drive gear 18A so that the feed drum 17 can rotate in conjunction with the drive gear 18. .

On the other hand, the needle bearing 14 mounted on the lining material pressing means 13 has a boss 12A in FIG.
When the outer ring is impacted by the lower end of the boss 12A, the lining material pressing means 13 is mounted in the boss 12A. A non-interference member 15 is disposed at the upper ends of the lining material pressing means 13 and the needle bearing 14, and further, the output shaft 11 of the motor block 11 is provided.
A is fastened to the boss 12A. When the output shaft 11A has been fastened to the boss 12A, the lining material pressing means 1
3 is positioned in a state where it projects from the lower end surface of the blade 12 by a predetermined amount (L). This predetermined amount (L) is set to such a length that the blade 12 does not damage the lining material 2.

The driving gear 18 of the motor block 11, the blade moving means 16 and the driving means 18 is
9 and the idle gear 1 of the driving means 18
When the drive gear 8B and the drive worm gear 18C are disposed in the upper body 19, the drive gear 18A and the idle gear 18B mesh with each other. When the cam roller 19A is attached to the upper body 19, the cam roller 19A fits into the cam groove 17A of the feed drum 17, and
The feed drum 17 is moved up and down according to the state of opposition to the cam groove 17A.

On the other hand, when the existing pipeline 1 is pierced by the cutting tool 12, as shown in FIG. 4, it is fixed by a tying member such as a chain 21 wrapped around the lower half of the existing pipeline 1. Upper body part 1 for lower body part 22
9 is installed. At the time of installation, the lining material pressing means 1 is installed by a drill (not shown) before the installation.
A small hole for inserting the third hole 3 is formed. When the above members are installed on the upper body 19, the bolts 11C of the motor block 11 protrude upward from the upper surface of the upper body 19, and the protrusions of the bolts 11C are adjusted by turning the nuts 20, thereby making the blade 12 Is brought into contact with the outer peripheral surface of the existing pipeline 1. Thereby, the blade 1
The amount of movement of the feed drum 2 and the feed drum 17 in the punching direction can be set in accordance with the shape of the cam groove 17A of the feed drum 17 while eliminating errors such as play.

When the feed amount setting handle 18D of the driving means 18 is rotated at the same time that the electric motor M of the motor block 11 is started, the driving worm gear 18
C rotates and its rotation is transmitted to the drive gear 18A via the idle gear 18B.
A rotates, and the feed drum 17 rotates in conjunction with this rotation. When the feed drum 17 rotates, the cam roller 19A of the upper body 19 is in an immobile state.
When the feed drum 17 advances along the shape of the cam groove 17A and advances in the cutting direction, the peripheral wall of the existing pipeline 1 is perforated. The advance amount of the feed drum 17 is
The state in which the lower end edge of the blade 12 is in contact with the outer peripheral surface of the existing pipeline 1 by setting the nut 17C on the bolt 11C is set as the drilling operation start position. The blade 12 that has begun drilling according to the shape of the cam groove 17A
Is such that no errors occur in the drilling stroke.

On the other hand, when the blade 12 advances into the peripheral wall of the existing pipeline 1 in accordance with the advance of the feed drum 17, the lining material pressing means 13 is moved to the peripheral wall of the existing pipeline 1 as shown in FIG. It penetrates the inside through the small hole, and pushes down the lining material 2 to keep it away from the blade 12. At this time, the tip of the lining material pressing means 13 does not interlock with the rotation of the blade 12 even though the tip thereof contacts the surface of the lining material 2, and therefore does not rub the surface of the lining material 2. This prevents the surface of the lining material 2 from being in frictional contact with the lining material pressing means 13, thereby preventing excavation by the lining material pressing means 13 and preventing the lining material from breaking.

[0023]

As described above, according to the first to third aspects of the present invention, since the blade facing the branch opening forming position of the pipeline is a downward cup-shaped blade, the positions of the tips are aligned. It can be unnecessary. In addition, since the lining material pressing means for moving the lining material away from the inner surface of the pipeline is provided at the center of rotation of the blade, the amount of lining material pressed by the lowering of the blade increases, and It is possible to reliably prevent the lining material from being perforated due to the increased distance. In addition, since the lining material pressing means can contact the surface of the lining material in an immobile state regardless of the rotation of the blade, it does not interlock with the rotation of the blade and generates frictional heat on the surface of the lining material. There is no. As a result, the surface of the lining material does not make frictional contact with the lining material pressing means, so excavation by the lining material pressing means is prevented and the thickness does not decrease, and damage to the lining material is prevented. It is possible to reliably prevent the reduction of the contact area of the branch joint. Furthermore, since the cutting tool used for drilling the lining material is constituted by a downward cup-shaped cutting tool, it is possible to save time and effort for positioning and mounting the cutting edge.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a schematic configuration of a branch joint mounting device according to the first to third aspects of the present invention.

FIG. 2 is a partial cross-sectional view for explaining a mounting relationship between a blade, a motor and a lining material pressing unit in the apparatus shown in FIG. 1;

FIG. 3 is another partial cross-sectional view for explaining a mounting relationship with a lining material pressing means.

FIG. 4 is a perspective view for explaining a case where the device shown in FIG. 1 is applied to an existing pipeline.

FIG. 5 is a perspective view for explaining an example of a branch joint mounting method.

FIG. 6 is a cross-sectional view for explaining one embodiment of a work procedure in the mounting method shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Existing pipe line 2 Lining material 10 Branch joint attaching device 11 Motor block 11A Output shaft 12 Cutting tool 13 Lining material pressing means 14 Needle bearing equivalent to a bearing member 15 Non-interference member for eliminating influence of motor block on lining material pressing means Reference Signs List 16 blade moving means 17 feed drum 17A cam groove 18 drive means 18A drive gear 18D feed amount setting handle 19 upper body section 19A cam roller

Claims (3)

[Claims] 1. A branch joint mounting device for use in connecting a branch pipe by forming a branch opening in a part of an existing pipeline having an inner lining material attached thereto, wherein the branch opening is formed. A downwardly facing cup-shaped rotatable blade facing the location, and a lining material pressing means provided at a rotation center position of the blade and having a tip protruding from a lower end of the blade, wherein the lining material pressing means is A branch joint mounting device for an existing pipeline, wherein the tip can press the surface of the lining material while maintaining a stationary state regardless of the rotation of the blade. 2. The apparatus according to claim 1, wherein the blade is integrally rotatable with a drive shaft penetrating an upper surface thereof, and the lining member pressing means is configured to rotate the blade. A branch of an existing pipeline, wherein a part of the pipe is inserted into the shaft, and the inserted position is supported by a bearing member with respect to the drive shaft so that rotation of the drive shaft is not transmitted. Joint mounting device. 3. The branch joint mounting device for an existing pipeline according to claim 1, wherein the lining member pressing means uses an extension of the drive shaft, and has a pressing part at its tip which comes into contact with the surface of the lining member. The existing pipeline is characterized in that it is formed and its pressing portion has a configuration independent of a portion other than the tip of the drive shaft, and is maintained in an immovable state by a pressing force generated between the lining material. Branch joint mounting device.