JPH08261386A - Cutting method for existing pipe - Google Patents

Abstract

PURPOSE: To provide an existing pipe cutting method which is so constituted as to simplify a mechanism and structure and besides reduce an amount of chips generated during cutting, and decrease the generation of noise. CONSTITUTION: A water line pipe 2 is cut in such a way that superhigh pressure water is injected against a water line pipe 2 surrounded in a watertight manner through a superhigh pressure water injection nozzle 71 from the outside along a given cut line X. Chips generated during cutting is sucked with the aid of a suction pump and this constitution simplifies a mechanism and structure and besides, prevents outflow of chips into a pipe, and also reduces the generation of noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing pipe cutting method for cutting a water pipe in an uncut water state in an intermediate portion of an existing pipe regardless of whether fluid in the pipe is in circulation.

[0002]

2. Description of the Related Art Conventionally, large diameter water pipes such as mains of water
To install branch piping without shutting off the water supply,
A partitioning chamber is provided around the branching part of the water mains that requires branching with a sealed casing having a partition wall (valve) that can be opened and closed, and a hole is made in the wall of the water pipe in this partitioning chamber. Uninterrupted water works that perform processing and pipe excision work are known.

As a cutting device for cutting this water pipe into slices, for example, as disclosed in Japanese Utility Model Laid-Open No. 63-201013, there is known a pipe slicer using a chain saw or a band saw. This is a mechanism for relatively moving the frame itself, which is equipped with pulleys and rollers for hanging an endless saw such as a chain or band, between the pipes that are the objects to be cut as the cutting progresses. .

[0004]

However, as in the above-mentioned prior art, the frame itself equipped with pulleys and rollers for winding an endless saw such as a chain or band is
As the cutting progresses, the mechanism that relatively moves between the pipes to be cut not only has a complicated mechanism and structure, but also has a heavy weight and requires a large amount of work.

Further, when this apparatus is used, a large amount of cutting chips are generated during cutting due to mechanical cutting, the cutting chips flow out into the pipe, and noise during construction is large.

The present invention has been made by paying attention to the problems as described above, has a simple mechanism and structure, and minimizes the amount of chips generated during cutting, and can be used from outside the water pipe. It is an object to provide a construction method that can directly cut an existing pipe.

[0007]

In the existing pipe cutting method of the present invention, a water supply work is carried out in which a predetermined portion of an existing water pipe is surrounded by a sealed casing and a part of the water pipe located in the sealed casing is cut out. In order to control the water injection pressure from the moving means and the water injection nozzle from the outside of the hermetically sealed housing, an ultrahigh pressure water jet nozzle having a moving means is installed on the outer peripheral surface of the water pipe in the hermetically sealed housing. It is characterized by having done.

In the existing pipe cutting method of the present invention, the ultra-high pressure water jet nozzle extends into the adsorption flare pressed against the existing pipe, and the water in the space between the water pipe and the adsorption flare is suctioned by the suction hose. It is preferable that suction is possible.

According to the existing pipe cutting method of the present invention, before the water pipe is surrounded by the hermetically sealed casing, a guide rail is installed in the vicinity of the cut point so as to surround the water pipe, and the guide rail is used to install the super high pressure water jet nozzle. It is preferable to induce it.

In the existing pipe cutting method of the present invention, guide rails are installed at two locations on the existing water pipe, and at least one super high pressure water jet nozzle is installed on each guide rail. It is preferable to cut out two portions of the tube at the same time.

In the existing pipe cutting method of the present invention, two or more ultra high pressure water injection nozzles are installed on one guide rail, and four or more ultra high pressure water injection nozzles cut out a water pipe by simultaneous control. Preferably.

In the existing pipe cutting method of the present invention, it is preferable to install the guide rail in the cutting and removing portion of the water pipe cut out by the ultra-high pressure water jet nozzle.

In the existing pipe cutting method of the present invention, the end portion of the fiberscope is extended substantially parallel to and in the vicinity of the ultra-high pressure water jet nozzle so that the cut portion can be monitored from the outside of the sealed casing. Is preferred.

[0014]

[Function] Since the water pipe is cut by the ultra-high pressure water jet nozzle that moves on the outer peripheral surface of the water pipe, the nozzle is not only easy to install, but also the noise is small, and the cutting powder is extremely small compared to mechanical cutting. The inflow of cutting powder into the water pipe is extremely small. Furthermore, since the material used for cutting is water, there is no adverse effect on tap water.

By suctioning the water in the space between the suction flare of the water pipe and the suction hose, the cutting powder by the sprayed water is discharged to the outside, and the spraying pressure used for cutting is effective. Can be improved.

If the guide nozzle is used to guide the jet nozzle, the cutting line of the water pipe can be arbitrarily determined and the jet nozzle follows the same locus, so that stable cutting work can be performed.

If the guide rails are installed at two places, cutting and removal of the water pipe can be completed in a short time.

If a large number of injection nozzles are used for cutting water pipes while being guided by their respective guide rails, cutting and removal of the water pipes can be completed in a shorter time.

If the guide rail is installed in advance in the cutting and removing section, this guide rail can be taken out to the outside together with the cutting and removing section.

If the cutting status can be monitored by the fiberscope, the progress of cutting work can be confirmed and the construction mistake can be eliminated.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall view of an existing pipe cutting device according to an embodiment of the present invention, FIG. 2 is an enlarged view of its essential parts, and FIG. 3 is an enlarged view of its essential parts.
FIG. 4 is a sectional view showing the main part of another embodiment.

The sealed casing 1 shown in FIG. 1 includes a first compartment 3 for cutting a water pipe (existing pipe) 2, a sluice valve chamber 4 and a second compartment 5 below. Made of

The first compartment 3 is formed in a bottomed cylindrical shape having a diameter larger than the outer diameter of the water pipe 2, and is divided into two parts which sandwich the water pipe 2 vertically. The penetrating portion 3a of the first compartment 3 through which the water pipe 2 penetrates is watertightly fixed so that the strength can be sufficiently maintained even if the water pipe 2 is cut midway.
6 is a lid detachably attached to the second compartment 5.

Two ultra-high pressure water jet nozzle devices 7 are installed in the sealed casing 1. As shown in FIGS. 1, 2 and 3, the ultra-high pressure water jet nozzle devices 7 are remote devices. 8, an injection nozzle 71 to which ultra high pressure water is supplied by an ultra high pressure water pump 10, a suction port 74 connected to the suction pump 9, and the injection nozzle 71 and the suction port 74 are extended inside. Adsorbed flare 72 and drive wheels 73 that move along the guide rails 14 provided on the outer circumference of the water pipe 2.
It has and. The drive wheels 73 are driven by electricity supplied from the power supply device 11 in the remote device 8. A motor 75 is provided in the ultra-high pressure water injection nozzle device 7, and the guide rail 14 is fixed in advance to the cutting and removing section 2a of the water pipe to be cut.
In, the water pipe 2 is installed so that the upper portion is widened and inclined. The reason for this is that the required cutting lines X at the two outer peripheries of the water pipe 2 become widened and inclined with respect to the direction in which the tubular portion 2a of the cut water pipe 2 is moved, and the cutting removal after the completion of cutting. This is so that the portion 2a can be easily pulled out upward.

The remote device 8 may further include a monitor screen 12 for monitoring the movement of the ultra high pressure water jet nozzle device 7 and a remote control panel 13. Reference numeral 91 is a suction hose, 101 is an injection hose, 111 is a power supply and control cable, and each hose 9 of the super high pressure water injection nozzle 7
1a, 91b, 101a, 101b, 111a, 111
b and each hose 91, 101, 111 of the remote device 8 is a lid 6
Are connected via a relay device 15 provided in the.

Reference numeral 16 denotes an elevating shaft which is vertically movable by a driving means (not shown) in a direction orthogonal to the axis of the water pipe 2 which needs to be cut. A mounting member 18 mounted on the surface of the tube 2 is provided.

Next, a method of cutting and removing a predetermined portion of the water pipe 2 into a tubular shape in the uninterrupted water state by using the embodiment of the present invention configured as described above will be described.

(A) First, the guide rail 14 is installed on the water pipe 2 along the required cutting line X which requires cutting at two outer circumferences in the axial direction of the water pipe 2 such that the upper portion of the guide rail 14 is widened and inclined.

(B) After the drive wheel 73 and the locking portion of the ultra high pressure water jet nozzle device 7 are installed on the guide rail 14, the water pipe 2 is placed in the first compartment 3 with the gate valve 41 retracted. , The partition valve chamber 4 and the second compartment 5 are watertightly enclosed, the mounting member 18 is attached to the water pipe 2, and the lid 6 is fixed to the second compartment 5.

(C) Next, the suction pump 9 is operated by the remote control panel 13 to adsorb the adsorption flare 72 of the ultra-high pressure water jet nozzle device 7 on the outer circumference of the water pipe 2.

(D) Further, the remote control panel 13 is operated to operate the ultra-high pressure water pump 10, and the injection hoses 101, 10
Ultra high pressure water is jetted from the jet nozzle 71 to the required cutting line X of the water pipe 2 via 1a (101b), while the motor 75 is driven via the power supply / control cables 111, 111a (111b) to drive wheels. 73 is gradually moved along the guide rail 14.

When the ultra high pressure water jet nozzle device 7 makes one or more revolutions around the water pipe 2, the water pipe 2
The cutting will be completed over the entire circumference of. The two ultra-high pressure water jet nozzle devices 7 can also be operated individually by the remote control panel 13.

(E) The chips a generated during the cutting of the water pipe 2 in (d) are sucked by the suction pump 9 for adsorbing the ultra high pressure water injection nozzle device 7 to the water pipe 2,
It is inhaled through the suction hose 91a (91b) (see FIG. 3).

(F) When the water pipe 2 is completely cut along the required cutting line X, the elevating shaft 16 is driven by the driving means (not shown).
Can be lifted up to store the cutting removal portion 2a in the second compartment 5, close the sluice valve 41, and remove the lid 6 together with the lid 6 from above (see the broken line diagram in FIG. 1).

(G) After that, instead of the cutting and removing section 2a,
By attaching a valve body (not shown) or the like to the elevating shaft 16 and lowering the elevating shaft 16, the valve body or the like can be fixed after the cutting and removing section 2a.

As described above, in the cutting method according to the embodiment of the present invention, since the water pipe 2 is cut by using the ultra-high pressure water jet nozzle device 7, the mechanism and the structure are simple, and the water pipe is simple. Since ultra-high pressure water is used for cutting 2, the amount of chips generated during cutting is drastically reduced.

Further, in this embodiment, most of the chips a generated during cutting remain in the space between the adsorption flare 72 and the surface of the water pipe 2, and the force of the suction pump 9 causes the suction port 74 and the suction hose 91a. Since it is inhaled from (91b), the outflow of cutting chips into the water pipe 2 can be prevented as much as possible.

Further, in this embodiment, the outer circumference 2 of the water pipe 2 is
Since the required cutting line X that requires cutting of the portion is widened and inclined with respect to the direction in which the cutting and removing section 2a is extracted, the cutting and removing section 2a can be easily removed, and the cross section of the cutting and removing section Since the flatness is high, the mounting accuracy of the valve body, the branch pipe, etc. is improved.

A second embodiment of the present invention is shown in FIG. 4, in which the objective lens portion of the fiberscope 76 extends substantially parallel to and in the vicinity of the jet nozzle 71.
An appropriate light can be provided at this tip, and the depth of the groove of the water pipe cut by the injection nozzle 71 can be monitored.

The present invention can adopt various embodiments,
Since the guide rail 14 guides the ultra-high pressure water jet nozzle device 7, it is possible to predetermine the position and shape to be cut, and a plurality of ultra-high pressure water jet nozzle devices 7, 7, ... Are attached to the guide rail 14. If so, the cutting time can be shortened.

If the guide rail 14 is provided inside the required cutting line X, that is, in the cut removing portion 2a as in the present embodiment, the guide rail 14 can be taken out together with the cut removing portion 2a. The rail 14 does not interfere with the subsequent pipe work.

Particularly in the present invention, if a groove is gradually formed around the water pipe 2 without making a hole in the water pipe 2 at once by an injection nozzle, and a finally thinned portion is cut out, The amount of cutting powder entering the water pipe 2 can be minimized.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

[0045]

As described above, according to the present invention, the following effects can be obtained.

(A) Since the water pipe is cut by the ultra-high pressure water jet nozzle that moves on the outer peripheral surface of the water pipe, the nozzle is not only easy to install, but also the noise is small, and the amount of cutting powder is extremely small compared to mechanical cutting. Therefore, the inflow of cutting powder into the water pipe is extremely small. Furthermore, since the material used for cutting is water, there is no adverse effect on tap water.

(B) By suctioning the water in the space between the suction flare of the water pipe and the suction hose, the cutting powder produced by the sprayed water is discharged to the outside and the spray pressure used for cutting is also provided. Can be effectively improved.

(C) If the jet nozzle is guided by using the guide rail, the cutting line of the water pipe can be arbitrarily determined, and the jet nozzle follows the same locus, so that stable cutting work is possible. Become.

(D) If two guide rails are installed, cutting and removal of the water pipe can be completed in a short time.

(E) If a large number of injection nozzles are used for cutting water pipes while being guided by respective guide rails, cutting and removal of water pipes can be completed in a shorter time.

(F) If the guide rail is installed in advance in the cutting and removing section, this guide rail can be taken out to the outside together with the cutting and removing section.

(G) If the cutting state can be monitored with a fiberscope, the progress of cutting work can be confirmed, and construction errors can be eliminated.

[0053]

[Brief description of drawings]

FIG. 1 is an overall view of an existing pipe cutting device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment of the present invention.

FIG. 3 is an enlarged sectional view of an essential part of the embodiment of the present invention.

FIG. 4 is a cross-sectional view of essential parts of a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealed casing 2 Water pipe 3 1st division chamber 3a Penetration part 3b Flange part 4 Gate valve chamber 5 2nd division chamber 6 Lid 7 Super high pressure water injection nozzle device 71 Injection nozzle 72 Adsorption flare 73 Drive wheel 74 Suction port 75 Motor 76 Fiberscope 8 Remote device 9 Suction pump 91 Suction hose 91a Suction hose 91b Suction hose 10 Ultra high pressure water pump 101 Injection hose 101a Injection hose 101b Injection hose 11 Power supply device 111 Power supply and control cable 111a Power supply and control cable 111b Power supply and control cable 12 Monitor screen 13 Remote control panel 14 Guide rail 15 Relay device 16 Lifting shaft 17 Rope 18 Mounting member

Claims (7)

[Claims] 1. In a waterworks construction in which a predetermined portion of an existing water pipe is surrounded by a sealed casing and a part of the water pipe located in the sealed casing is cut out, the water pipe is moved to the outer peripheral surface of the sealed casing. An existing pipe cutting method in which an ultra-high pressure water jet nozzle having means is installed and the water jet pressure from the moving means and the water jet nozzle can be controlled from the outside of the sealed casing. 2. The ultra-high pressure water injection nozzle extends into an adsorption flare that is pressed against an existing pipe, and can suck water in a space between the water pipe and the adsorption flare with a suction hose. The existing pipe cutting method according to claim 1. 3. A guide rail is installed in the vicinity of the cut point so as to surround the water pipe before the water pipe is surrounded by the hermetically sealed casing, and the super high pressure water jet nozzle is guided by this guide rail. The existing pipe cutting method described in 1 or 2. 4. A guide rail is installed at two locations on the existing water pipe, and at least one ultra-high pressure water injection nozzle is installed on each guide rail, and two locations of the water pipe are cut out at the same time. The existing pipe cutting method according to claim 3, wherein. 5. A single guide rail is provided with two or more ultra high pressure water injection nozzles, and four or more ultra high pressure water injection nozzles cut out a water pipe by simultaneous control.
Existing pipe cutting method described in. 6. The existing pipe cutting method according to claim 3, wherein the guide rail is installed in a cutting and removing section of a water pipe cut by an ultra-high pressure water jet nozzle. 7. The fiber scope according to claim 1, wherein an end of the fiberscope is extended substantially parallel to and in the vicinity of the ultra-high pressure water jet nozzle so that the cut portion can be monitored from the outside of the hermetically sealed casing. Existing pipe cutting method described in.