JPH0424164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable, for example, in construction work to connect a branch pipe to a water main pipe, when an opening is bored in the peripheral wall of the water main pipe to allow the main pipe and the branch pipe to communicate with each other. More specifically, it is a device that is attached to a fluid transport pipe in such a manner that a sealed space is formed between the outer surface of the peripheral wall of the transport pipe, and that connects the end of another fluid transport pipe to the sealed space. When the work case is connected to the connection case, it can be inserted and moved into the connection case through the communication ports of both cases. By inserting and moving the fluid transport pipe while rotating around the axis along the insertion movement direction, the peripheral wall portion of the fluid transport pipe located on the path of the insertion movement is cut, and the fluid is applied to the peripheral wall of the fluid transport pipe. The present invention relates to a drilling device for a fluid transport pipe, which is equipped with a cylindrical rotary cutter for drilling an opening for communicating the inside of the transport pipe with the sealed space.

In this type of drilling device for fluid transport pipes, the rotary cutter is housed inside the work case, so that it is possible to prevent the fluid in the fluid transport pipes from leaking during drilling. An advantage is that the port can be formed in the peripheral wall of the fluid transport pipe while transporting fluid in the pipe.

As shown in FIG. 7, the conventional punching device having the above-mentioned advantages includes insertion movement into the axis of the rotary cutter 8 while the rotary cutter 8 rotates;
In other words, by continuously providing the drill-like member 10' that screws into the peripheral wall portion 1a to be cut during the cutting operation, the cut peripheral wall portion 1a is exposed to the outside when the rotary cutter 8 is removed after cutting. It was configured to be taken out.

However, when using the above-mentioned conventional device, the cut peripheral wall portion can be taken out at the same time when the rotary cutter is removed, and the work of removing the cut peripheral wall portion after the rotary cutter is removed is unnecessary, which improves cutting work efficiency. Although it has some advantages, it also has the following disadvantages.

In other words, when cutting with a rotary cutter, a drill-like member must be screwed into the peripheral wall, which increases the size and weight of drive devices such as motors, making it difficult to carry the machine into the site, carry it out, install it, and remove it. Post-workability is poor and costs are high.

As a means to eliminate such inconveniences, for example, as shown in Japanese Patent Application Laid-Open No. 57-89509,
There is also a device configured to displace the rotational axis of the rotary cutter laterally from the central axis of the fluid transport pipe and to perform drilling with the rotational axis positioned outside the circumferential surface of the fluid transport pipe. However, in this case, the rotary cutter does not have a drill in the center, and the drill cannot hold the cut piece after cutting, so the cutter is cut only by friction with the inner surface of the rotary cutter. It was difficult to securely hold the pieces, and a great deal of effort was required to remove the pieces that had fallen off.

An object of the present invention is to provide a drilling device that eliminates the waste of driving the drills simultaneously when drilling using a rotary cutter, and also allows easy and reliable removal of cut pieces.

The technical means of the present invention for achieving the above object is that the fluid transport pipe is attached to the outer surface of the peripheral wall of the transport pipe in such a manner that a sealed space is formed between the pipe and the end of another fluid transport pipe. a connection case formed with a connection port for connection in a state of communicating with a closed space; a work case that can be connected in communication with the communication port of the connection case in a direction perpendicular to the axis of the fluid transport pipe; When the fluid transport pipe is installed inside the work case and inserted into the connection case through the communication port, an opening is formed in the peripheral wall of the fluid transport pipe for communicating the inside of the fluid transport pipe and the sealed space. A perforating device for a fluid transport pipe, which is equipped with a rotary cutting device, is provided with the configurations described in [A] to [D] below.

[B] The rotary cutting device is rotatably driven around a rotation axis perpendicular to the axis of the fluid transport pipe, and the rotation axis is located offset to the outside of the outer peripheral surface of the fluid transport pipe, A cylindrical rotary cutter is attached to the work case in such a manner that the rotation locus of the tip blade intersects with the peripheral wall of the fluid transport tube as the cutting edge moves through the insertion, and a rod-shaped rotary cutter is located at the center of rotation of the rotary cutter. It is composed of members.

[B] A holding member having a fitting portion into which the rod-like member can be inserted is provided on the connection case on an extension of the rod-like member, and is detachably attached to the connection case.

[C] The rod-shaped member and the holding member are provided with an engaging means that automatically engages in a locking state when the rod-shaped member is inserted into the insertion portion of the holding member.

[d] The holding member has a circumferential surface on the side opposite to the outer circumferential surface of the fluid transport pipe, and which rotates more than a position where the circumferential surface of the fluid transport pipe is closest to the rotational axis. A step portion is formed at a position on the distal end side in the cutter insertion direction to protrude outward in a radial direction farther from the rotation axis than the circumferential surface of the fluid transport tube at a position opposite to the closest position on the circumferential surface of the fluid transport tube. .

The effects and effects of taking the above technical measures are as follows.

That is, after cutting, the holding member automatically connected to the axis of the rotary cutter is disconnected from the connection case and pulled out together with the rotary cutter, so that the cut peripheral wall portion is held between the rotary cutter and the holding member. However, since the cutting peripheral wall portion can be taken out, the cutting power device requires only a minimum amount of power to operate only the rotating cutter. A rational and efficient work style can be adopted.

Therefore, according to the present invention, the driving device of the rotary cutter can be configured to be small and lightweight, and the preliminary work such as mounting, carrying in, and installation, and the subsequent work such as removal and carrying out can be performed efficiently, and the cutting peripheral wall can be Combined with the ability to efficiently perform cutting operations, including reliable removal of parts, work efficiency has been significantly improved.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, the connection case 3 is attached and fixed in a state that forms a sealed space 2 between the outer surface of the peripheral wall of the fluid transport pipe 1, and the connecting case 3 is attached to the peripheral wall of the fluid transport pipe 1.
An opening 4 for communicating the inside of the fluid transport pipe 1 with the sealed space 2 is formed, and the connection case 3 includes:
A connection port 5 is provided to connect the end of another fluid transport pipe 1' to the sealed space 2, and the communication port 4 in a structure in which two fluid transport pipes 1, 1' are connected in communication is provided. This device is configured as follows.

That is, as shown in FIGS. 2 and 3, the perforation device is attached to the fluid transport pipe 1 in such a manner as to form a sealed space 2 between it and the outer surface of the peripheral wall of the transport pipe 1,
and a connection port 5 for connecting the end of another fluid transport pipe 1' to the sealed space 2 in a state where it communicates with the end.
The connection case 3 in which the connection case 3 is formed;
a work case 6 that can be connected to the communication port 7 in a direction perpendicular to the axis of the fluid transport pipe 1; A rotary cutting device C is provided for boring an opening 4 in the circumferential wall of the fluid transport pipe 1 for communicating the inside of the fluid transport pipe 1 and the sealed space 2 as the fluid transport pipe 1 is moved. This rotary cutting device C is rotationally driven around a rotation axis X that is orthogonal to the axis of the fluid transport pipe 1, and the rotation axis X is located offset to the outside of the outer peripheral surface of the fluid transport pipe 1. At the same time, the rotation locus of the tip blade 8a changes along the insertion movement, causing the tube peripheral wall portion 1a of the fluid transport tube 1 to change.
It consists of a cylindrical rotary cutter 8 attached to the work case 6 in a state that intersects with the rotary cutter 8, and a rod-shaped member 9 located at the center of rotation of the rotary cutter 8. The communication port 4 is formed in the peripheral wall of the fluid transport pipe 1 by cutting the peripheral wall portion 1a by inserting and moving the rotary cutter 8 while rotating while being prevented by the case 6. Further, the perforating device can be attached and fixed to the connection case 3 in a state where it can be freely unfixed from the outside, and in the attached and fixed state,
As the rotary cutter 8 is inserted and moved, a continuous rod-shaped member 9 is inserted into the axis of the rotary cutter 8 to guide the insertion and movement of the rotary cutter 8, and the rotary cutter 8 finishes cutting. As the rod-shaped member 9 is inserted and moved to the end, it can be automatically engaged and connected to the rod-shaped member 9 so as to prevent it from coming off in the axial direction,
and a member 1 capable of holding the cut peripheral wall portion 1a with the rotary cutter 8 in the engaged and connected state.
0, and after cutting, the rotary cutter 8 is pulled out while the holding member 10 is released from the connection case 3, so that the cut peripheral wall portion 1a can be taken out along with it. Reference numerals 11 and 12 are a rotation drive motor and an insertion/extraction drive motor for the rotary cutter 8. Further, the rotary cutter 8 is configured to be removable from the rotary shaft 13 driven by both the motors 11 and 12.

The work case 6 can be connected to the connection case 3 in communication with a cylindrical case 6A provided with an opening/closing shutter 6a, and can be flange-connected to the cylindrical case 6A in communication with the rotation shaft 1 at the bottom.
3 and a bottomed cylindrical case 6B that rotatably and slidably supports 3.

The guide-holding member 10 is connected to the connection case 3.
A bolt 14 that passes through the wall portion through which the rotational axis X of the
It is attached and fixed to the connection case 3 with
The pin 15 attached thereto is stopped and positioned by engaging with a hole formed in the case wall,
Then, by inserting the peripheral wall portion 1a to be cut in the direction perpendicular to the rotation axis X,
The cutting peripheral wall portion 1a is prevented from moving in the axial direction and moving away from the rotary cutter 8.
A recessed portion 10a is formed to hold the holding member 10, and the recessed portion 10a is located on the peripheral surface of the holding member 10 on the side facing the outer peripheral surface of the fluid transport pipe 1 and with respect to the rotational axis X. The circumferential surface of the fluid transport pipe 1 is located at a position closer to the distal end in the insertion direction of the rotary cutter 8 than the position where the circumferential surface of the fluid transport pipe 1 is closest to the circumferential surface of the fluid transport pipe 1; Rotation axis X
It forms a step portion that projects radially outwardly away from the step.

The means 18 for automatically engaging and connecting the holding member 10 to the rod-shaped member 9 includes forming a circumferential groove 16 near the tip of the rod-shaped member 9, and
The elastic C-shaped member 17, which is elastically biased to an enlarged diameter state and protrudes from the circumferential surface of the rod-shaped member 9, is inserted into the axially position-regulated state, while the holding member 1
When the rotary cutter 8 reaches the deep part of the insertion part 10A of 0, near the cutting end, the elastic C-shaped member 1
7, and is provided with an enlarged diameter portion that forms a stopper surface 18a that contacts the elastic C-shaped member 17 that has undergone diameter enlargement deformation in the extraction direction.

As shown in FIGS. 4 to 6, the connection case 3 is attached to the fluid transport pipe 1 with cylindrical parts 3A and 3A that fit onto the fluid transport pipe parts located on both sides of the communication port forming part, respectively. and both cylinder parts 3
The means for attaching A and 3A to the fluid transport pipe 1 is an annular member 1 that is disposed opposite flanges 3a and 3a fixed to the cylindrical portions 3A and 3A in the axial direction of the pipe.
An annular rubber 20, which is interposed between the end face of the cylindrical portions 3A, 3A and the annular members 19, 19, with the bolts/nuts 20, 20...
20 is deformed so as to be press-fixed in close contact with the outer surface of the peripheral wall of the fluid transport pipe 1, thereby sealing between the cylindrical portions 3A, 3A and the fluid transport pipe 1 with the annular rubbers 20, 20. Annular rubber 20,
20 as an anchor. and the connection case 3 and the annular members 19, 19.
The two halves are fitted onto the fluid transport pipe 1 by abutting and welding the two halves so as to hold the fluid transport pipe 1 from the pipe diameter direction, and , annular rubber 20,20
is configured to be fitted onto the fluid transport pipe 1 by fixing the ends of the rubber wrapped around the fluid transport pipe 1. 21... is connection case 3
and the fluid transport pipe 1, and 22 is a lid for closing the opening 3B of the connection case 3 for forming the insertion opening 7. It is configured so that it can be attached to the rotating shaft 13 with the cutter 8 removed. 23
24 is a bolt for temporarily fixing the lid 22 to the connection case 3 by an external operation when the work case 6 is connected; It is a fixing ring that is fixed to the connection case 3, and 25, 26
are caps for preventing fluid leakage from the insertion portions of the bolts 14 and 23, respectively.

Next, the procedure for connecting the two fluid transport pipes 1 and 1', including the formation of the communication port 4, will be explained.

○B As shown in FIG. 3A, the connection case 3 with the holding member 10 attached is attached to the fluid transport pipe 1, and the work case 6 inside the rotary cutter 8 and the separate fluid transport pipe are connected to the connection case 1. tube 1'
Connect with.

○B As shown in FIG. 3B and FIG. 2, the rotary cutter 8 is inserted and moved while being rotated to cut the peripheral wall portion 1a and drill the communication port 4.

○C As shown in FIG. 3C, after loosening the bolt 14 and releasing the fixation of the holding member 10 to the connection case 3, move the rotary cutter 8 to the bottom side of the shutter 6a with each holding member 10. Remove it and move it until
After that, the shutter 6a is closed.

○D With the shutter 6a closed, remove the bottomed cylindrical case 6B from the cylindrical case 6A, attach the lid 22 to the rotating shaft 13 in place of the rotary shutter 8, and then reinstall the bottomed cylindrical case 6B into the cylinder. After connecting to the case 6A, as shown in FIG.

○E As shown in FIG. 5, remove the work case 6 from the connection case 3 and fix the lid 22 to the connection case 3 via the fixing ring 24.

In the drawings used to explain the above embodiment, a mode is shown in which the communication port 4 is formed without dividing the fluid transport pipe 1, but the drilling device according to the present invention has the following features:
It can also be applied to the case where the communication port 4 is formed in a state where the fluid transport pipe 1 is divided.

Examples of the fluid transport pipe 1 to be perforated in the present invention include water pipes, gas pipes, and the like.

[Brief explanation of drawings]

The drawings show an embodiment of the perforating device for a fluid transport pipe according to the present invention, in which Fig. 1 is a schematic sectional view of a fluid transport pipe connection part, Fig. 2 is a vertical sectional side view of the main part, and Fig. 3 A,
B, C, and D are schematic sectional views showing usage instructions, FIG. 4 is a cross-sectional plan view of the pipe connection, and FIGS. 5 and 6 are sectional views taken along lines - and - in FIG. 4, respectively. , FIG. 7 is a schematic sectional view showing a conventional example. 1, 1'...Fluid transport pipe, 2...Closed space, 5
...Connection port, 3...Connection case, 6...Work case, 7...Communication port, 1a...Peripheral wall portion, 4...
...Communication port, 8... Rotating cutter, 8a... Tip blade, 9... Rod-shaped body, 10A... Fitting part, 10a...
...Stepped portion, 18...Engagement means, C...Rotary cutting device, X...Rotation axis, 10...Holding member.

Claims (1)

[Scope of Claims] 1. A fluid transport pipe 1 that is attached to a fluid transport pipe 1 in such a manner that a sealed space 2 is formed between the outer surface of the peripheral wall of the transport pipe 1, and that an end of another fluid transport pipe 1' is connected to the closed space. 2
A connection case 3 in which a connection port 5 is formed for connection in a state of communicating with the fluid transport pipe 1, and a work that allows communication and connection to the communication port 7 of the connection case 3 in a direction perpendicular to the axis of the fluid transport pipe 1. A case 6 is installed in the working case 6, and as it is inserted and moved into the connection case 3 through the communication port 7, the peripheral wall of the fluid transport pipe 1 is connected to the inside of the fluid transport pipe 1 and the sealed space. A perforating device for a fluid transport pipe, comprising: a rotary cutting device C for perforating an opening 4 for communicating with a fluid transport pipe; [B] The rotary cutting device C is configured to cut the fluid transport pipe 1.
is rotated around a rotation axis X perpendicular to the axis of the fluid transport tube 1, and the rotation axis X is located offset to the outside of the outer peripheral surface of the fluid transport tube 1, and the rotation locus of the tip blade 8a corresponds to the insertion movement. A cylindrical rotary cutter 8 attached to the work case 6 in a state intersecting with the pipe peripheral wall portion 1a of the fluid transport pipe 1, and a rod-shaped member 9 located at the center of rotation of the rotary cutter 8. It is configured. [B] A holding member 10 having a fitting portion 10A into which the rod-like member 9 can be inserted is provided on the connection case 3 on an extension line of the rod-like member 9, and is detachably attached to the connection case 3. There is. [C] The rod-shaped member 9 and the holding member 10 are
The holding member 10 is provided with an engaging means 17 that automatically engages in a locking state when the rod-shaped member 9 is inserted into the insertion portion 10A. [d] The holding member 10 includes the fluid transport pipe 1
The fluid is placed on the circumferential surface of the side opposite to the outer circumferential surface of the rotary cutter 8, and at a position closer to the distal end in the insertion direction of the rotary cutter 8 than the position where the tube circumferential surface of the fluid transport tube 1 is closest to the rotation axis X. A step portion 10a is formed that projects outward in the radial direction away from the rotation axis X than the circumferential surface of the transport pipe 1 at a position opposite to the closest position. 2. The perforation device for a fluid transport pipe according to claim 1, wherein the holding member 10 also serves as a guide member for guiding the insertion movement of the rod-shaped member 9 of the rotary cutting device C.