JP2003148680A - Rotary sleeve supporting device of continuously supplied water pipe cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary sleeve supporting device for a continuously supplied water pipe cutting device capable of enhancing the water stop performance while a constant rate of compression is kept at all times without giving an excessive load to an elastic seal ring. SOLUTION: The rotary sleeve supporting device of the continuously supplied water pipe cutting device includes a rotary sleeve 24 mounted rotatably and water-tightly on casings 15 and 16 installed at the peripheral surface of any existing fluid pipe 10 and cuts the pipe 10 using a cutting tool rotating in a single piece with the rotary sleeve 24. The rotary sleeve 24 is supported on the casings 15 and 16 by a supporting means furnished with the elastic seal ring 25 for establishing water-tightness and a retainer ring 26 of resin for bearing the load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, rotation of a rotary sleeve that is watertightly and rotatably attached to a casing provided on an outer peripheral surface of an existing fluid pipe such as a water pipe or a gas pipe. The present invention relates to a rotary sleeve supporting device in an uninterrupted water cutting device that cuts the existing fluid pipe with a cutting tool that rotates integrally with the rotary sleeve.

[0002]

2. Description of the Related Art FIG. 5 is a side view of a conventional existing pipe, in which a part of an uninterrupted water cutting device for cutting the flow of an internal fluid is not cut off, and FIG. FIG. 3 is a detailed view of a main part of the rotary sleeve support device in FIG.

In FIG. 5, reference numeral 01 denotes an existing pipe to be cut, for example, a water pipe, which is cut by a cutting tool 02 such as an end mill set in a raised position. Conventionally, when cutting a water pipe 01 of this type, first, a guide pipe 04, 05 on the left and right, a pair of left and right casings 06, 06, and a rotating sleeve 07 are attached to the water pipe 01 that is exposed by excavating the ground 03. After installing in order, guide sleeve 0
The water pipes 01 on both sides of 4, 05 are supported by a pair of left and right supports 09 provided upright on the base plate 08.

Then, after the sluice valve device 010 and the cutting device 011 are attached to the upper opening of the rotary sleeve 07, the drive means such as the drive sprocket 012 and the motor 013 are mounted on the base plate 08 below the rotary sleeve 07. Is installed, a driven sprocket (not shown) is attached to the outer peripheral surface of the rotary sleeve 07, and a chain 014 is wound around both sprockets.

In this state, the hydraulic motor of the cutting device 011 is operated to rotate the end mill 02, and the end mill 02 is lowered toward the upper end surface of the water pipe 01. After the upper end of the water pipe 01 is punched by the tip of the end mill 02, the motor 013 is operated to rotate both chains 014 and the rotary sleeve 07 is rotated once in a fixed direction to cut the water pipe 01.

At the time of cutting the water pipe, the rotary sleeve 07 is supported by the rotary sleeve supporting means 015 and rotates around the housing 06. As can be seen from FIG. 6 showing the details of the essential parts of the rotary sleeve supporting means 015, the rotary sleeve supporting means 015 is constituted by a push wheel 016 screw-engaged with the rotary sleeve 07 and an axial thrust force of the push wheel 016. The elastic seal ring 017 is configured to be compressed, and the elastic seal ring 017 has a function of preventing the fluid from leaking from the room R surrounded by the housing 06 and a function of supporting the weight of the rotating sleeve 07. is doing.

The above-mentioned conventional rotary sleeve supporting means 01
5, the elastic seal link 017 is attached to the rotary sleeve.
Due to the eccentric force due to the drive of the motor 07 and the eccentric rotation due to the machining and assembling error, an excessive load is given and there is a problem in its durability.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide an elastic seal ring without applying an excessive load to the elastic seal ring.
It is an object of the present invention to provide a rotary sleeve supporting device in an uninterrupted water cutting device, which constantly maintains a constant compression rate to improve water blocking performance.

[0009]

In order to achieve the above object, the rotary sleeve supporting device in the water cutting device of the present invention is watertight and rotatable with respect to the casing provided on the outer peripheral surface of the existing fluid pipe. A rotary sleeve supporting device in a non-interruptible water cutting device that cuts the existing fluid pipe with a cutting tool that rotates integrally with the rotary sleeve by rotation of the rotary sleeve attached to the rotary sleeve, and an elastic seal ring for watertightness and a load. It is characterized in that the rotating sleeve is supported on the housing by a supporting means provided with a resin retainer ring for supporting. According to this feature, the rotating sleeve
Since the eccentric force acting on the hub is received by the housing side through a resin retainer ring with low frictional resistance, stable rotation support can be achieved, and since the elastic seal ring is not subject to unprecedented variable load, it is always constant. Water can be stopped with a compressibility.

In the rotary sleeve supporting device in the uninterruptible water cutting device of the present invention, it is preferable that the supporting means adjusts the compression ratio of the elastic seal ring by adjusting the axial thrust by the push ring provided on the rotary sleeve. By doing so, the optimum compression rate of the elastic seal ring can be obtained by adjusting the axial thrust of the push wheel.

In the rotary sleeve supporting device in the water cutting device according to the present invention, it is preferable that the supporting means has the elastic seal ring sandwiched by the retainer ring. With this configuration, the retainer rings on both sides of the elastic seal ring receive the load from the rotary sleeve, and thus more stable rotary support can be achieved.

In the rotary sleeve supporting device of the uninterrupted water cutting device of the present invention, it is preferable that the retainer ring has a small projection formed on at least one side of the inner and outer peripheral surfaces thereof. With this configuration, the small protrusions serve as the contact portion of the rotating sleeve or the case, so that not only the contact resistance is reduced, but also when an unnecessarily large load is applied or when welding distortion or the like occurs. This can be dealt with by deforming and abrading the small protrusions. Also, when the retainer ring is inserted into the support space, it can be smoothly inserted due to the deformation of the small protrusions.

In the rotary sleeve supporting device of the uninterrupted water cutting device of the present invention, the elastic seal ring is crushed by the retainer ring so that the contact area between the elastic seal ring and the casing is different. preferable. With this configuration, the side where the relative rotation is caused corresponds to the side having the smaller contact area, whereby the sealing property can be secured while suppressing the sliding resistance.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a rotary sleeve support device according to a first embodiment of the present invention, and FIG. 2 is a partial cross-sectional view near a support portion of a rotary sleeve support device according to a second embodiment of the present invention. FIG. 3 is a partial cross-sectional view of the vicinity of the support portion of the rotary sleeve support device according to the third embodiment of the present invention, and FIG. 4 is the vicinity of the support portion of the rotary sleeve support device according to the modification of the third embodiment. FIG.

In FIG. 1, reference numeral 10 denotes a water pipe to be cut, and a pair of left and right steel guide sleeves 1 of a cylindrical shape having an upper and lower two-divided structure are provided on the outer peripheral surface at appropriate places.
1, 12 are fitted to each other with a predetermined distance from each other, and both end openings are welded to the outer peripheral surface of the water pipe 10, and the upper and lower abutting surfaces are welded to each other so as to be fixed in a sealed manner. .

The outer peripheral surface of the left guide sleeve 11 is formed into a spherical surface 11a centered on the tube axis, and annular stoppers 11b are continuously provided at both left and right ends thereof. The guide sleeve 12 on the right side is formed on the cylindrical surface 12a, and the annular stoppers 12b are also connected to the outer peripheral surfaces at the left and right ends thereof.

Around the water pipe 10 between the left and right guide sleeves 11 and 12, a pair of left and right casings 15 and 16 made of steel and having a cylindrical structure of two upper and lower parts are required between the facing surfaces. The outer ring is fitted so as to form an annular gap, and the upper and lower butt surfaces are welded to be integrated.

The guide sleeves 11 and 12 are provided because after cutting the water pipe 1 and returning it to the ground again, a tensile force or a compressive force is applied to the water pipe 1 due to an earthquake or ground subsidence. This is because even if a bending moment acts in a direction orthogonal to the pipe, the flexible structure is used to absorb the stress acting on the water pipe 1.

The inner peripheral surface of the left end portion of the left casing 15 is in sliding contact with a substantially intermediate portion of the spherical surface 11a of the left guide sleeve 11 and is inserted into an annular groove formed in the left end of the casing 15. Ring 17 is divided into two by bolt 18
By pressing 9, the watertightness of the sliding contact surface between the guide sleeve 11 and the left housing 15 is maintained.

Similarly, the inner peripheral surface of the right end portion of the right casing 16 is also in sliding contact with the cylindrical surface 12a of the right guide sleeve 12, and is inserted into the annular groove formed at the right end of the casing 16. 20 is divided into two by bolts 21 Ring ring 2
By pressing 2, the watertightness of the sliding contact surface between the guide sleeve 12 and the housing 16 on the right side is maintained.

On the outer peripheral surfaces of the opposite ends of the left and right casings 15 and 16, a rotary sleeve 24 having an upper and lower two-divided structure is provided with a pair of annular grooves 24a on the inner peripheral surfaces thereof, and the flanges 15 of both the casings.
By being loosely fitted in a and 16a, movement in the tube axis direction is restricted and the outer fitting is rotatably provided.

An elastic seal ring 25 and a retainer ring 26 are inserted into annular recessed grooves 24c formed in the inner peripheral surfaces of both ends of the rotary sleeve 24 having a guide passage 24b for the cutting tool formed in the central portion. Both of these are the rotating sleeve 2
Water pressure is maintained between the outer peripheral surfaces of both the housings 15 and 16 and the inner peripheral surface of the rotary sleeve 24 by pressing the both sides of the housing 4 with the push wheels 28 secured to the bolts 27.

The retainer ring 26 is made of resin having a small sliding resistance, and is dimensioned by the weight of the rotary sleeve 24 when the rotary sleeve 24 rotates around the housings 15 and 16 and the eccentric load during rotation. This retainer ring 26 supports the fluctuation of C. Therefore, the elastic seal ring 25 always performs a sealing operation while maintaining a constant compression rate. The compression rate of the elastic seal ring 25 can be changed by adjusting the screwing amount of the push ring 28.

FIG. 2 is a cross-sectional view of a main part showing a second embodiment of the rotary sleeve support device of the present invention, in which the elastic seal ring 30 is sandwiched between two retainer rings 32, 32. The pressing ring 28 is pushed in by the screwing amount of the bolt 27, and the compression rate of the elastic seal ring 30 is changed in the same manner. Retainer ring 3 that supports eccentric load
Since 2 is arranged at two places with a distance, more stable rotation support can be achieved.

The retainer ring 32 used in the second embodiment differs from the retainer ring 26 described in the previous embodiment in that it has the small protrusion 32a. As shown in FIG. 2, small protrusions 32 a are formed on the inner peripheral surface and the outer peripheral surface of the retainer ring 32. Since these small protrusions 32a have a small area in contact with the rotary sleeve 24 or the housing 15, the sliding resistance can be reduced accordingly.

When an excessive load is applied,
When welding distortion or the like occurs, the small protrusion 32a is deformed,
Not only can it be dealt with by abrasion, but also when the retainer ring 32 is inserted into the support space which is the annular groove 24c of the rotary sleeve 24, it can be smoothly inserted by the deformation of the small protrusion 32a. Although the small projections 32a are formed on both the inner and outer peripheral surfaces in this embodiment, they may be formed on either one of the peripheral surfaces. The shape of the small protrusions 32a includes not only granular protrusions but also ring-shaped protrusions.

FIG. 3 is a cross-sectional view showing a third embodiment of the rotary sleeve support device of the present invention. The outer peripheral surface 34a of the elastic seal ring 34 is formed to have a larger area than the inner peripheral surface 34b. The retainer rings 36, 36 to be sandwiched are also structured such that their side surfaces can be brought into close contact with the elastic seal ring 34.

The retainer ring 3 is driven by the axial thrust of the push wheel 28.
When the elastic seal ring 34 is pressed through 6, 36,
The outer peripheral surface 34a having the larger contact area has the rotary sleeve 24.
When the rotating sleeve 24 is rotated, the rotating sleeve 24 wraps around with the elastic seal ring 34, and the inner peripheral surface 34b having a small contact area makes sliding contact with the housing 15, so that the sliding resistance can be kept small. You can

FIG. 4 shows another elastic seal ring 38 whose contact area can be made different between the inner peripheral surface and the outer peripheral surface.
It is shown. Since the inner peripheral side of the elastic seal ring 38 is partially tapered (38a), the outer peripheral side has a larger contact area than the inner peripheral side. In this case, the retainer ring 40 may be an ordinary ring having a rectangular cross section.

[0030]

The present invention has the following effects.

(A) According to the first aspect of the invention, since the eccentric force acting on the rotary sleeve is received by the housing side through the retainer ring made of resin having a small frictional resistance, stable rotation support is achieved. In addition, since the elastic seal ring is not subjected to an unprecedented fluctuating load, it is possible to stop water with a constant compression rate.

(B) According to the second aspect of the invention, the optimum compression ratio of the elastic seal ring can be obtained by adjusting the axial thrust of the push wheel.

(C) According to the third aspect of the invention, since the load from the rotary sleeve is received by the retainer rings on both sides of the elastic seal ring, more stable rotary support can be achieved.

(D) According to the invention of claim 4, since the small protrusion serves as a contact portion of the rotary sleeve or the case, not only the contact resistance is reduced but also when a load more than necessary is applied. , If the welding distortion etc. has occurred, the small protrusion will be deformed,
It can be dealt with by wearing. Also, when the retainer ring is inserted into the support space, it can be smoothly inserted due to the deformation of the small protrusions.

(E) According to the fifth aspect of the invention, by making the side where the relative rotation occurs corresponds to the side having a smaller contact area, it is possible to secure the sealing property while suppressing the sliding resistance.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a rotary sleeve support device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view in the vicinity of a support portion of a rotary sleeve support device according to a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view near a support portion of a rotary sleeve support device according to a third embodiment of the present invention.

FIG. 4 is a partial cross-sectional view near a support portion of a rotary sleeve support device according to a modification of the third embodiment.

FIG. 5 is a side view showing a partial cross section of a non-interruptible water cutting device for cutting a conventional existing pipe without interrupting the flow of an internal fluid.

FIG. 6 is a detailed view of a main part of the rotary sleeve support device in FIG.

[Explanation of symbols]

10 Water Pipe (Existing Pipe) 11 Guide Sleeve 11a Spherical Surface 11b Annular Stopper 12 Guide Sleeve 12a Cylindrical Surface 12b Annular Stopper 15 Housing 15a Flange 16 Housing 16a Flange 17,20 Packing 18,21 Bolt 19,22 Annular Ring 24 Rotating Sleeve 24a annular groove 24b guide passage 24c annular groove 25 elastic seal ring 26 retainer ring 27 bolt 28 push ring 30 elastic seal ring 32 retainer ring 32a small protrusion 34 elastic seal ring 34a outer peripheral surface 34b inner peripheral surface 36 retainer ring 38 elastic seal ring 38a (Where it is tapered) 40 Retainer ring

Claims (5)

[Claims] 1. The existing fluid pipe is cut by a cutting tool that rotates integrally with the rotary sleeve by rotating a rotary sleeve that is watertightly and rotatably attached to a casing provided on the outer peripheral surface of the existing fluid pipe. A rotating sleeve supporting device in an uninterruptible water cutting device, wherein the rotating sleeve is supported on the casing by a supporting means provided with an elastic seal ring for watertightness and a resin retainer ring for supporting loads. A rotary sleeve supporting device in an uninterrupted water cutting device. 2. The rotary sleeve supporting device in a non-interruptible water cutting device according to claim 1, wherein the support means adjusts the compression rate of the elastic seal ring by adjusting the axial thrust by a push ring provided on the rotary sleeve. 3. The supporting means, wherein the elastic seal ring is sandwiched by the retainer ring.
A support device for a rotating sleeve in the water cutting device according to claim 1. 4. The rotary sleeve support device in a non-interruptible water cutting device according to claim 1, wherein the retainer ring has a small projection formed on at least one side of the inner and outer peripheral surfaces thereof. 5. The uninterrupted water cutting according to claim 1, wherein the elastic seal ring is crushed by the retainer ring so that the contact areas of the rotary sleeve and the casing are different from each other. Rotating sleeve support device in a device.