JP4643163B2 - Rotating sleeve support device in continuous flow cutting device - Google Patents

Description

  The present invention relates to a rotating sleeve support device in a continuous flow cutting device for existing pipes.

In recent years, as a continuous flow cutting device of this type, a rotating sleeve mounted in a watertight and rotatable manner on a casing fixed to the outer periphery of an existing pipe is rotated along the outer periphery of the existing pipe so as to be integrated with the rotating sleeve. What cut | disconnected the said existing pipe | tube with the cutting tool rotated rapidly was implement | achieved (for example, refer patent document 1).
JP 2003-148680 A

  In such a cutting device, since the rotational resistance accompanying the rotation of the rotating sleeve is large, when cutting an existing pipe having a large diameter, there is a possibility that the existing pipe cannot be smoothly cut by the cutting tool.

  Since the existing pipe with a large diameter often has a flat shape due to its own weight, it may be impossible or difficult to rotate the rotating sleeve and the cutting tool along the outer periphery of the existing pipe. .

  Accordingly, an object of the present invention is to provide a rotating sleeve support device in an uninterrupted flow cutting device that enables or facilitates cutting of an existing pipe having a large diameter.

  In order to achieve the above-mentioned object, the present invention integrates with a rotating torus by rotation of a rotating torus that is mounted in a watertight and rotatable manner on a fixed torus fixed to the outer periphery of an existing pipe. A rotating sleeve support device in an uninterrupted flow cutting device that cuts the existing pipe with a rotating cutting tool, wherein the inner peripheral portion of the fixed torus has a flat shape along the flat outer periphery of the existing pipe. And a plurality of freely rotatable rollers are provided on the two side surfaces of either the rotating or stationary annular body, and the other of the rotating or stationary annular body, A substantially circular guide part is provided for contacting the outer peripheral surface of the roller and guiding the movement of the roller along the outer periphery of the existing pipe, and the roller is in contact with the guide part, thereby A rotating torus is inserted into the existing pipe through the fixed torus. Characterized in that it is supported.

According to the present invention, since the roller rolls along the guide portion, the rotational resistance is reduced, and the rotating torus rotates smoothly. Therefore, even when an existing pipe having a large diameter is cut, the cutting of the existing pipe with the cutting tool becomes smooth.
The fixed annular body has a flat inner peripheral part, so that it can be easily sealed with a flat pipe, and a substantially circular guide part is provided around the flat existing pipe. Since the rotating torus rotates, the flat existing pipe can be cut.

In the present invention, the first fixed portion having an inner periphery along the outer periphery of the flattened existing pipe, and a substantially perfect second fixed portion welded to the first fixed portion, the second fixed portion is provided. The plate | board thickness of a fixing | fixed part is larger than the said 1st fixing | fixed part, and the said guide part is formed in the 2nd fixing | fixed part .
Since the first fixing part is thin, the fusing process can be easily performed at the construction site, so that the workability is excellent.

In the present invention, when the existing pipe is made of a steel pipe, the fixed torus is welded to the existing pipe through the first fixing portion, and the rotating torus is arranged in the tube axis direction of the fixed torus. Are preferably engaged.
If it does in this way, it can prevent that a pipe moves immediately after cutting by stress which acts on a pipe because a rotating torus engages with a welded fixed ring. Therefore, it is difficult for the cutting tool to bite between the pipes during cutting.

Embodiment 1 of the present invention will be described below with reference to the drawings.
The cutting device according to this embodiment is mainly used for cutting a large-diameter existing pipe made of a steel pipe. As shown in FIG. 1, the existing pipe 10 is deformed by its own weight into a flat shape in which the vertical diameter φS of the existing pipe 10 is small and the horizontal diameter φL is large.

  As shown in FIGS. 3 (a) and 3 (b), a pair of fixed annular members 20 spaced apart from each other by a predetermined dimension in the tube axis direction S of the existing tube 10 are fixed to the outer periphery of the flat existing tube 10 (for example, Have been welded). As shown in FIG. 3A, the fixed torus 20 has a first fixing portion 21 and a second fixing portion 22. The plate thickness of the second fixing portion 22 is set larger than the plate thickness of the first fixing portion 21.

  As shown in FIG. 1, the first fixing portion 21 has an inner periphery along the outer periphery of the flat existing pipe 10, and has a substantially perfect outer periphery. The first fixing portion 21 is fixed to the outer peripheral surface of the existing pipe 10 by welding. On the other hand, the second fixing portion 22 has a substantially circular inner periphery and outer periphery, and is welded to the first fixing portion 21 as shown in FIG. Therefore, the fixed torus 20 is welded to the existing pipe 10 via the first fixing portion 21.

As shown in FIG. 3B, at the position P _L of the longest diameter of the existing pipe 10 (see FIG. 1), the first fixing part 21 is welded when the first fixing part 21 is welded to the existing pipe 10. As a result, the second fixing portion 22 is welded to the existing pipe 10 as a result.

  On the outer periphery of the fixed ring 20, a rotating ring 30 having a cylindrical shape is attached so as to be rotatable with respect to the fixed ring 20. As shown in FIGS. 3A and 3B, the rotating torus 30 includes first and second engaging portions 35 and 36 that extend toward the existing tube 10 at both ends in the tube axis direction S. have. The first and second engaging portions 35 and 36 are provided to be separated from each other in the tube axis direction S, and the fixed torus is provided between the first engaging portion 35 and the second engaging portion 36. The upper end portion of 20 is fitted. Therefore, since the rotating torus 30 is engaged with the fixed torus 20 in the tube axis direction S, the existing tube 10 is cut by the stress acting on the existing tube 10 when the existing tube 10 is cut. Can be prevented from bending or moving in the tube axis direction S.

  A space between the fixed torus 20 and the rotating torus 30 is sealed by a rubber ring 24 held by the first engagement portion 35 to maintain watertightness. A large number of rollers 32 that are rotatably supported are provided on two side surfaces of the rotating annular body 30 that are separated from each other in the tube axis direction S, that is, on the inner side surface 31 of the second engaging portion 36. . As shown in FIG. 1, the multiple rollers 32 are provided in the circumferential direction R of the rotating torus 30.

  The second fixing portion 22 of the fixed torus 20 is in contact with the outer peripheral surface of the roller 32 and along a substantially perfect circle that guides the roller 32 moving along the outer periphery of the existing pipe 10. A formed guide groove (guide portion) 23 is formed. Since the roller 32 is in contact with the guide groove 23, the rotating annular body 30 is supported by the existing pipe 10 via the fixed annular body 20.

  As shown in FIG. 2, the rotary ring body 30 is provided with a cutting machine mounting portion 3 </ b> A and a gate valve mounting portion 3 </ b> B at positions separated from each other in the circumferential direction R. As shown in FIGS. 3A and 3B, the cutting machine mounting portion 3 </ b> A is provided with a support portion 5 that supports the cutting machine 4.

The cutting unit 4 is supported on the support portion 5 via a guide bush 52. The cutting machine 4 includes a main shaft 42 that is rotatable with respect to the cutting machine main body 41 and can be moved back and forth in the pipe radial direction C, and an end mill 40 that is integrally formed at the tip of the main shaft 42. The end mill 40 has cutting edges on the front end surface and the outer peripheral surface of a cylinder, and is rotated and moved back and forth integrally with the main shaft 42 by a driving means (not shown), so that the front end surface of the end mill 40 moves the existing pipe 10. Can be cut and cut. The existing pipe 10 can be cut by rotating the rotating torus 30 around the existing pipe 10 while rotating the end mill 40 in the cut state of FIG.
As a method of rotating the rotating torus 30 around the existing pipe 10, a known method can be used. For example, Japanese Patent Laid-Open No. 2003-127021, (0029) to (0033), Patent Document 1 Can be employed.

After the existing pipe 10 is cut by the end mill 40, the work upper tank 74 that houses the gate valve body 8 is attached to the gate valve mounting portion 3B of FIG. 2 as shown in FIG. As shown in FIG. 4, the gate valve mounting portion 3 </ b> B is provided with an insertion passage 6 communicating with an opening 30 b formed in a slit shape in the circumferential direction R of the rotating torus 30. A flange 61 is provided in the upper opening 6 a of the insertion passage 6, and the opening 6 a is closed by joining a flange lid 62 to the flange 61.
An auxiliary plate 65 is inserted between the flange 61 and the flange lid 62, and a knife gate 67 is sandwiched between the auxiliary plate 65 and the flange 61. The rubber ring 24 seals between the flange 61 and the knife gate 67 and between the auxiliary plate 65 and the flange lid 62.

  As shown in FIG. 1, the fixed annular body 20 is provided with a number of push screws 7 in the circumferential direction R. As shown in FIGS. 3 and 4, these push screws 7 are screwed into the second fixing portion 22 of the fixed annular body 20, and are rotated in one of the tube axis directions S by rotating the push screw. By screwing, as shown in FIG. 8, the seal packing 8 a of the gate valve body 8 can be pressed against the cut surface 10 a of the existing pipe 10 and sealed.

Cutting process Next, the cutting procedure will be described. First, the fixed annular body 20 is welded to the existing pipe 10 in a state where the fluid flows in the existing pipe 10 of FIG. At this time, in order to correct a deviation between the shape of the inner periphery of the first fixing portion 21 formed in advance and the shape of the actual outer periphery of the existing pipe 10, the first fixing portion 21 is processed at the construction site. Although it may be necessary, as described above, since the plate thickness of the first fixing portion 21 is thin, the processing of the first fixing portion 21 can be easily performed. The second fixing portion 22 is welded to the first fixing portion 21 in advance.

Next, after the rotating torus 30 is attached to the fixed torus 20, as shown in FIG. 1, the cutting machine attaching portion 3A and the gate valve attaching portion 3B are positioned at the shortest diameter position P _{S of} the existing pipe 10, that is, Then, the rotating torus 30 is moved in the circumferential direction R so as to reach the upper and lower positions of the existing pipe 10. In this state, after attaching the cutting machine 4 to the cutting machine attachment part 3A, while rotating the end mill 40, as shown by the solid line in FIG. Cutting is completed by sending the end mill 40 in the radial direction C of the existing pipe 10 up to the penetrating position.

After this cutting, the rotating torus 30 is rotated around the existing pipe 10 with the roller 32 of the rotating torus 30 guided by the guide groove 23. Since the guide groove 23 in FIG. 1 is formed in a substantially perfect circle, the end mill 40 moves along a substantially circular locus O together with the rotating torus 30 while rotating around the main shaft 42 as shown in FIG. Along the existing pipe 10. Thus, the end mill 40 is flat and has as it moves to the maximum diameter position P _L from the position P _S of the shortest diameter of the existing pipe 10, existing in the outer circumferential surface of the base end portion near the outer peripheral surface near the tip of the end mill 40 By cutting the tube wall of the tube 10 and making one rotation, the existing tube 10 is cut into a substantially annular shape.

Cutting machine removing step After the cutting, the cutting machine 4 is removed by the method described below. That is, in the cutting machine attachment part 3A of FIGS. 3A and 3B, the flange part to which the support part 5 is joined is provided with a temporary fixing part 55, and the cutting machine 4 is moved from the support part 5 to the flange part. By inserting a closing plate (not shown) into the temporary fixing portion 55 while being extracted, the cutting machine attachment portion 3A is closed. After this blockage, the support part 5 is removed from the cutting machine attachment part 3A, and the valve 9 of FIG. 6 is attached to the cutting machine attachment part 3A.

Gate valve insertion process Next, the upper tank 74 for work which accommodated the gate valve body 8 is joined to the gate valve mounting part 3B. A hoisting elevator 75 is attached to an upper portion of the working upper tank 74, and the gate valve body 8 is suspended by a wire wound around the hoisting elevator 75. Therefore, the gate valve body 8 is lowered in the insertion passage 6 of the gate valve mounting portion 3B by the hoisting elevator 75 and inserted into the cutting removal portion 12 of the existing pipe 10. In this way, the gate valve body 8 is inserted into the existing pipe 10 as shown in FIG.

  The gate valve 8 in FIG. 7A is provided with an annular seal packing 8a, and the existing pipe 10 is sealed by the seal packing 8a. That is, by screwing a large number of push screws 7 in FIG. 7B, as shown in FIG. 8, the gate valve 8 that has entered the cutting removal portion 12 is pressed in the pipe radial direction S, so that the existing pipe The seal packing 8a is pressed against the 10 cut surface 10a and sealed. The insertion position of the seal packing 8 a (gate valve body 8) is determined by a stopper 82 (FIG. 1) provided on the rotating annular body 30.

FIG. 9 is a cross-sectional view of a main part showing Embodiment 2 of the rotating sleeve support device of the present invention, and shows a state in which the fixed torus 20 is fixed to an existing pipe 10 made of a cast iron pipe such as FC or FCD. Show. In this case, since the 1st fixing | fixed part 21 cannot be welded to the existing pipe 10, the 1st fixing | fixed part 21 is being fixed to the outer periphery of the existing pipe 10 with many set screws which are not shown in figure. An annular groove 21a is formed at the outer end of the first fixed portion 21 in the tube axis direction S. By pressing the rubber packing 24B inserted into the annular groove 21a with the pressure ring 19, an existing groove is formed. The space between the tube 10 and the first fixing portion 21 is sealed.
Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same portions or corresponding portions, and detailed description and illustration thereof are omitted.

  In each of the above embodiments, the roller 32 is provided on the rotating torus 30 and the guide groove 23 is provided on the fixed torus 20 (second fixing portion 22). The guide groove 23 may be provided, and the roller 32 may be provided on the fixed annular body 20 (second fixed portion 22).

It is a cross-sectional view which shows Example 1 of the rotating sleeve support apparatus of this invention. It is a partial cross section side view which shows the whole apparatus. (A) And (b) is a longitudinal cross-sectional view which mainly shows the fixed torus and rotation torus in the shortest diameter position and longest diameter position of the existing pipe 10, respectively. It is a longitudinal cross-sectional view which shows a gate valve attaching part. It is a schematic diagram which shows the cutting process of the existing pipe | tube with a cutting tool. It is a partial cross section side view which shows the state which accommodated the gate valve body in the upper tank. (A) is a front view which shows a gate valve body, (b) is a cross-sectional view which shows the state which inserted the gate valve body in the pipe line of the existing pipe | tube. It is a fragmentary sectional view which shows the state of the seal by a gate valve body. 6 is a partial cross-sectional view showing Example 2. FIG.

Explanation of symbols

10: Existing pipe 20: Fixed torus 21: First fixing part 22: Second fixing part 23: Guide groove (guide part)
30: Rotating torus 31: Side surface 32: Roller 40: End mill (cutting tool)
S: Pipe axis direction

Claims (2)

The existing pipe is cut by a cutting tool that rotates integrally with the rotating annular body by rotating the rotating annular body that is mounted in a watertight and rotatable manner with respect to the fixed annular body fixed to the outer periphery of the existing pipe. A rotating sleeve support device in a continuous flow cutting device,
The inner periphery of the fixed torus has a flat shape along the outer periphery of the flat existing pipe,
A plurality of freely rotatable rollers are provided on the two side surfaces of either the rotating torus or the stationary torus, and
On the other side of the rotating torus or fixed torus, a substantially circular guide portion is provided that contacts the outer peripheral surface of the roller and guides the roller to move along the outer periphery of the existing pipe,
The rotating annular body is supported by the existing pipe through the fixed annular body because the roller is in contact with the guide portion ,
Here, the fixed torus has a first fixed part having an inner periphery along the outer periphery of the flat existing pipe, and a substantially perfect second fixed part welded to the first fixed part. The rotating sleeve support device in which the plate thickness of the second fixing portion is larger than that of the first fixing portion, and the guide portion is formed in the second fixing portion. In Claim 1 , the said existing pipe consists of steel pipes, the said fixed torus is welded to the said existing pipe through the said 1st fixing | fixed part, and the said rotating torus is the pipe-axis direction of the said fixed torus. Rotating sleeve support device engaged.

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