JP3308436B2 - Existing pipe cutting device, existing pipe replacement device using this device, and existing pipe replacement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing pipe replacement device used in an existing pipe replacement apparatus for cutting and removing a part of an existing pipe in a sealed housing and then replacing and replacing a replacement pipe section corresponding to the cut and removed pipe section. A pipe cutting device, wherein the existing pipe cutting device drives a rotary blade unit having a rotary blade via a transmission means and a guide support unit that rotatably supports a rotary blade unit around the existing pipe axis. And a driving unit for driving the above. Further, the present invention relates to an existing pipe exchange apparatus using the above existing pipe cutting apparatus and an existing pipe exchange method using such an existing pipe exchange apparatus.

[0002]

2. Description of the Related Art A conventional cutting device used in an existing pipe exchange device is provided in a holding / elevating device of the existing pipe exchange device, and extends an arm according to an axial length of a pipe portion to be cut and removed. A cutting operation is performed by adding a cutting feed while rotating the rotary blade at a desired cutting position. Since the pipe to be cut and removed is provided with a valve and the like, the length of the cut and removed pipe in the axial direction tends to be long, so that the span from the center of the holding and lifting device to the rotary blade is small. Get bigger,
The deflection of the arm cannot be neglected, and the rotary blade chatters, so that sufficient cutting accuracy cannot be obtained. Furthermore, since the weight and bulk of the cutting device are increased, the load on the holding elevating device is increased. As a result, the technical and manufacturing costs for the holding elevating device are increased. In order to solve the above problem, the rotary blade portion and the drive portion of the cutting device are divided, only the drive portion is fixed to the holding elevating device, and the rotary blade portion is directly attached to the cutting removal pipe portion. Japanese Patent Laid-Open Publication No. 4-21 discloses a rotary blade connected by a chain transmission mechanism.
0191. However, also in this cutting device, since the rotary blade portion is attached to the pipe portion that is cut and removed from the existing pipe, even if the cutting and removing pipe portion is held by the holding portion of the holding elevating device, the cutting is almost completed. However, there is a problem in that the cutting / removing tube vibrates considerably, and as a result, cutting cannot be performed with sufficient accuracy. If the cutting accuracy is poor, that is, if the cut surface does not have sufficient quality,
This causes inconvenience in joining with the tube to be replaced. If an attempt is made to increase the rigidity of the holding portion of the holding / elevating device in order to solve this problem, the weight and bulk of the entire holding / elevating device also increase, and the technical and manufacturing costs for the holding / elevating device increase. .

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to keep the supporting structure of the cutting blade portion rigid so that the cutting blade portion does not vibrate as much as possible in the existing pipe cutting step, and to provide a holding elevating device. An object of the present invention is to provide an existing pipe cutting device that does not impose a great burden. Further objects of the present invention are:
To provide an existing pipe exchange device that employs the above existing pipe cutting device, particularly satisfying uninterrupted water conditions, and to provide an existing pipe replacement method under uninterrupted water conditions using such an existing pipe exchange device. It is.

[0004]

SUMMARY OF THE INVENTION An existing pipe cutting apparatus used in an existing pipe replacement apparatus for cutting and removing a part of an existing pipe in a sealed housing and replacing and attaching a replacement pipe section corresponding to the cut and removed pipe section. In order to solve the above-mentioned problems in the apparatus, in the present invention, the existing pipe cutting device includes a guide support unit that rotatably supports a rotary blade unit having a rotary blade around the existing pipe axis, and a transmission unit that transmits the rotary blade unit. And a driving unit for driving through the
The guide support portion is configured to be fixed to a lower region portion of the housing in which a cutting remaining pipe portion other than the cutting removal pipe portion of the existing pipe is externally sealed, or to a cutting remaining pipe portion inside the housing. Have been. According to the above configuration, the guide support portion that rotatably supports the rotary blade unit of the existing pipe cutting device is attached to the existing pipe that is arranged with high rigidity by embedding even after the cutting operation,
Alternatively, it can be sealed to the existing pipe and attached to the lower housing which can be rigidly held by the ground via a reinforcing material. In any case, since it is not attached to the pipe to be cut as in the prior art described above, the guide support section throughout the entire cutting process allows the rotary blade unit to maintain a stable posture. , Good cutting quality can be obtained. Furthermore, in order to configure an existing pipe replacement device of a water-stop type using this existing pipe cutting device according to the present invention, the cutting / removing pipe portion is held and lifted, and the replacement pipe portion is held and lowered. A housing elevating device capable of moving up and down between an ascending position and a descending position, and a shielding shutter for separating the interior of the housing into an upper space and a lower space in a sealed state between the ascending position and the descending position. It is good to provide in. Also,
According to the present invention, as a method for replacing existing pipes using the existing pipe replacement device of the unsuspended water type as described above, a method comprising the following steps is proposed: 1) Located on both sides of the cutting and removing pipe section. The lower housing is installed so that the existing pipe is fitted and sealed outside. 2) The guide support section of the cutting apparatus is oriented in the axial direction of the cutting removal pipe section so that the rotary blade of the cutting apparatus is located at a predetermined cutting position. 3) the drive unit and the rotary blade unit are connected to each other so as to be able to transmit power via transmission means, 4) the holding unit of the holding elevating device provided in the upper housing. 5) The upper housing is hermetically mounted on the lower housing to hermetically seal the inside of the housing. 6) The rotary blade is driven forward to cut and remove the rotary blade. 7) While rotating around the pipe portion and stepping radially inward to cut the cutting and removing tube portion, 7) rotating the rotary blade unit around the cutting and removing tube portion by reversely driving the rotary blade unit; Stepping radially outward to move the rotary blade away from the outer peripheral surface of the existing pipe; 8) Lifting the cut / removed pipe section to the raised position by the holding / elevating device; 9) Positioning below the raised position Actuate the shielding shutter to seal the lower space of the housing, 10) open the upper space of the housing, and attach to the holding section a replacement pipe section having seal flange members attached to both ends instead of the cutting and removing pipe section, 11) ) Closing the upper space of the housing and opening the lower space of the housing by a shielding shutter. 12) The interchange held by the holding portion of the holding elevating device. 13) The seal flange member is slid to the joint between the existing pipe and the replacement pipe section by a feeder mechanism operated from outside the housing. 14) The upper and lower parts. Remove the housing, the lifting device and the cutting device. According to this method, a part of the existing pipe can be cut and removed with a high quality cut surface, and the exchange pipe portion having an end surface corresponding to the cut surface can be mounted with a good connection state. In particular, this method offers great advantages for non-water cutting work in which the cut surface cannot be finished.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the present invention, as shown in FIG. 1, a driving unit 40 of the cutting device 4 is fixed to a lower housing 12 forming a lower region of the housing 10. Can be. In this case, the holding elevating device 5 only needs to have a function of holding the cutting and removing tube portion and the exchange tube portion, so that the structure of the holding elevating device 5 is very simple and contributes to weight reduction. Further, at this time, the drive unit 40 is connected to an electric motor 41 provided on the outer surface of the lower housing 12 and a through hole provided in the lower housing 12 so as to extend from the electric motor 41. And the extension shaft 42 that is rotatably sealed and inserted into the housing 10, the space occupied by the cutting device inside the housing is reduced, and as a result, the housing 10 is made compact. The downsizing of the housing 10 is considered when a large load corresponding to the amount of water is applied to the housing 10 because the inside of the housing is filled with the fluid, for example, water, which is being conveyed by the existing pipe during the replacement work. The benefits are great. As is clear from FIGS. 2 and 3, the guide support 30 of the existing pipe cutting device 4 guides the rotary blade unit 20 rotatably about the existing pipe axis X.
1 and a pedestal 32, and the pedestal 32 is firmly attached to the lower housing 12 or the cutting remaining pipe portion 2 b of the existing pipe 2. For this reason, at least the guide disk 31 and the circular member of the rotary blade unit 20 that rotates while being guided by the guide disk 31 need to surround the existing pipe from the outside, and thus are each divided into a plurality of fan-shaped members. It is a divided structure, which is integrated by bolt flange connection after surrounding the existing pipe. As shown in FIG. 3, the rotary blade unit 20 extends along the circumferential surface of the guide disk 31.
Rotates around the rotating blade unit.
There is provided a feed mechanism 60 for moving the rotary blade 22 orbiting along the circumferential surface in the direction of the existing pipe axis X. The feed mechanism 60 is provided on the lower housing 12 on the gear so that the screw 64 with the gear 64 provided on the rotary blade unit 20 and the gear 64 come into contact with the gear 64 by the rotation of the rotary blade unit 20. When the cutting device 20 is fixed to the lower housing 12, both the gear 64 and the contact piece 65 use the lower housing 12 having high rigidity as a basis for assembling. Sufficient positional relationship is maintained during use over a wide range. As the transmission means 50 for transmitting power from the electric motor 41 of the cutting device 4 to the rotary blade unit 20, for example, a chain transmission mechanism is proposed. Can be selected with a large degree of freedom, and the motor 41 can be set at an optimum position.
As one of preferred embodiments according to the present invention, as is apparent from FIG. 3, the shape of the rotary blade 22 is a main blade portion 22a for radially cutting the existing pipe and the burr for removing the burr of the cutting portion. It is proposed to form from a chamfered blade portion 22b inclined with respect to the main blade portion. As a result, the main blade 2
The burrs remaining after cutting the existing pipe in 2a are chamfered blade portions 22.
The chamfer, which can be removed in b and is neatly cut, facilitates the work of fitting with a new replacement tube.
As shown in FIG. 13, as another embodiment of the present invention, the driving unit 40 of the cutting device 4 is installed outside the housing 10, and the transmission means 150 is provided on the holding elevating device 5. is there. In this case, since the electric motor 41 of the drive unit 40 does not protrude to the side of the housing, the length of the entire existing pipe replacement device in the existing pipe axis direction is reduced. The transmission means 150 is provided in the holding elevating device 5,
Since the transmission means 150 itself is lightweight, the load is not so much imposed on the holding and lifting device 5. When the structure in which the transmission means 150 is provided in the holding / elevating device 5 is adopted, it is necessary to allow the distance between the rotary blade unit 20 and the transmission means 150 to be longer when the holding / elevating device 5 is raised. As a transmission mechanism at the last stage of the transmission means 150 for transmitting power to the unit 20, for example, a gear transmission mechanism 190 as shown in FIG. 16 is proposed. In the gear transmission mechanism, the gears 1
The meshing state of the gears 91 and 192 can be released simply by pulling them apart from each other, but it is preferable to round the tip of the tooth for smooth re-meshing. A chain transmission mechanism may be used as the last transmission mechanism of the transmission means 150 for transmitting power to the rotary blade unit 20, but in this case, as shown in FIG. 14, a sprocket wheel 154 on the drive unit side is wound. It is preferable to provide a chain guide mechanism 160 that allows the chain 155 to mesh only with the upper arc portion of the sprocket wheel 21 on the rotary blade unit 20 side. By creating such a traveling path of the chain, the holding elevating device 5
Comes to the descending position, the chain 155 wound around the sprocket wheel 154 on the drive unit side meshes with the sprocket wheel 21 on the rotary blade unit side, and power transmission becomes possible. In this state, the chain transmission mechanism does not interfere with the return of the holding elevating device to the ascending position. Of course, instead of providing such a chain guide mechanism 160, for example, as schematically shown in FIG. 15, a running chain such as a chain transmission is pressed laterally to move the chain from the sprocket wheel. A chain detaching mechanism 165 for detachment may be provided.

[0006]

FIG. 1 shows the overall construction of an existing pipe replacement apparatus according to the present invention in the form of a vertical sectional view. However, in order to make the drawing easier to see, some unnecessary lines have been omitted. It is not a drawing that meets strict drawing requirements. The existing pipe exchange device 1 cuts and removes an existing pipe portion 2a including an aged gate valve 3a of a water pipe 2 buried underground as an example of an existing pipe, and replaces the pipe section 2a with a new gate valve 3b. This is an apparatus for maintaining the flow of tap water, that is, in an uninterrupted state. As can be understood from the drawing, the existing pipe replacement device 1 is a cutting and removing pipe portion 2a to be replaced.
And a portion of the existing pipe 2b of a predetermined length located on both sides thereof is disposed in a pit excavated in the ground.
The existing pipe portion 2b for the predetermined length is hereinafter referred to as a remaining cutting pipe part. The existing pipe replacement device 1 is substantially entirely covered by a sealable housing 10, and the housing 10 is composed of an upper housing 11 and a lower housing 12 which are detachably connected via a sealing flange. The lower housing 12 includes a first member 12 located above the existing pipe 2 for sandwiching the existing pipe 2.
a and a second member 12 b located below the existing pipe 2, and an opening formed by facing a semicircular cutout 13 provided in each member to an existing pipe 2. 2 can be connected to each other by a sealing flange while penetrating. In order to securely seal the notch 13 and the notch 13 and to connect the lower flange 12 and the existing pipe 2, the notch 13 is divided by a radial cutting gland.
Although a two-part configuration is employed here, a ring flange 14 with a ring packing 14a is provided. The ring flange 14 is connected to the lower flange 12 with bolts on the one hand, and is connected to the existing pipe 2 by chucking with bolts on the other hand. Reference numeral 15 denotes a centering ring body which forms a conical outer peripheral surface used for centering the ring flange 14 with respect to the existing pipe 2, and is also a divided structure. The existing pipe exchange device 1 includes a pair of left and right existing pipe cutting devices 4 for cutting the existing pipe 2 as a core device thereof, a cutting / removing tube portion 2a for holding the cutting / removing tube portion 2a during the cutting process, and A holding elevating device 5 for exchanging with a new pipe portion is provided. The existing pipe cutting device 4 includes a rotary blade unit 20 that cuts the existing pipe while rotating around the axis of the existing pipe, a guide support unit 30 that rotatably supports the rotary blade unit 20, and a transmission to the rotary blade unit 20. And a drive unit 40 for supplying power via the means 50. As shown in FIGS. 2, 3, and 4, the rotary blade unit 20 includes a ring-shaped sprocket wheel 21 having a concave portion 21 a that receives the guide disk 31 of the guide support portion 30, and the sprocket wheel 21.
And a rotary blade 22 attached to a top member 61 of the feed mechanism 60. The feed mechanism 60 includes an angle-shaped bracket 6 directly fixed to the side surface of the sprocket wheel 21.
2, a screw rod 63 inserted through a through hole provided in a side portion of the bracket 62 extending in the axial direction, and a gear 64 mounted on one end of the screw rod 63.
The other end of the screw rod 63 is screwed into a through screw hole provided in the top member 61, and a large-diameter portion 63a that is enlarged from another portion is formed at an intermediate portion. The movement of the screw rod 63 in the screw axis direction with respect to the bracket 62 is restricted by the diameter portion 63a and the sprocket wheel 21. With this structure, when the gear 64 rotates in the forward direction, the top member 61 moves so that the rotary blade 22 eventually approaches the existing pipe axis X, and the gear 64 rotates.
Is rotated, the rotary blade 22 moves so as to separate from the existing pipe axis X. When the rotary blade unit 30 is rotated in a manner to be described later, the gear 64 is driven by a contact piece 65 projecting horizontally from the side wall of the lower housing 12 toward the inside in a specific rotation position area. This is achieved by the contact of the teeth. The protrusion amount of the contact piece 65 can be adjusted. Sprocket wheel 21
A ring plate 23 is attached to the side surface on the side of the concave portion 21a, thereby restricting the rotation blade unit 20 from separating from the outer peripheral portion of the guide disk 31 of the guide support portion 30 that has entered the concave portion 21a. In order to reduce the friction of the rotating contact surface between the guide disk 31 and the concave portion 21a of the sprocket wheel 21, this contact surface has a low friction material 2 such as resin.
4 is lined. The guide support section 30 includes a pedestal 32 of a guide disk 31. The pedestal 32 includes a cylindrical body and a ring body. The cylindrical body is connected to the guide disk 31, and the ring body is formed as a flange for bolt connection with the lower housing 12. The guide support portion 30 can be fixed to the cutting residual tube portion 2b as shown in FIG.
In this case, a pedestal 3 that can be bolted to the remaining cutting pipe 2b
3 is used. The sprocket wheel 21, the ring plate 23, the guide disk 31, and the pedestals 32, 33 are divided by a radial cutting gland so that the rotary blade unit 20 and the guide support unit 30 are installed so as to surround the outer peripheral surface of the existing pipe 2. Divided structure. Although the embodiment described here has a two-part configuration, it is needless to say that other plural-part configurations may be employed within the scope of the present invention as needed. In particular, it can be clearly understood from FIG. 2 that the sprocket wheel 21 is a two-piece structure and is integrated by flange bolt connection, but the other members described above are also of the same split structure and integrated by flange bolt connection. However, detailed illustration is omitted. In this embodiment, the drive unit 40 of the cutting device 4 is connected to an electric motor 41 attached to the outside of the side wall of the lower housing 12 and an output shaft of the motor, and is connected to the lower housing 1.
And an extension shaft 42 extending through the through hole provided in the side wall of the second and extending into the housing, and blocks water leaking from a gap between the through hole and the extension shaft 42, which is not shown in detail in the drawing. For this purpose, the electric motor mounting bracket is provided with sealing means such as packing. The transmission means 50 for transmitting the power of the drive unit 40 to the rotary blade unit 20 is configured as a chain transmission mechanism here, and includes a drive sprocket 51 provided on the extension shaft 42 and a tooth portion 21b of the sprocket wheel 21. And a chain 52 wound therearound. The holding elevating device 5 includes a lifting rod 71 vertically extending to the inside of the housing through a through hole provided in a top plate of the upper housing 11, and a holding attachment 72 attached to a lower end of the lifting rod 71. And the lifting rod 7
1 and a hanging bracket 73 fixed to the upper end. The hanging bracket 73 is provided with a locking portion for locking a hook of a crane (not shown), and the lifting rod 71 is moved up and down by the crane. The holding attachment 72 holds an existing pipe section or a new pipe section to be replaced, and various holding means 72 are provided so that an optimum one is selected depending on whether the holding target is a pipe section or a pipe section including various valves. Although the form is facilitated, it will not be described in detail here, and is only schematically shown. However, as shown in FIG. 7, the female mold 7 of the cradle 74 installed on the bottom surface of the lower housing 12 is provided at the bottom of the holding attachment 72.
4a is provided with a male mold 72a which engages with the male mold 72a and the female mold 74a.
2 horizontal positioning is guaranteed. The height of the receiving surface of the receiving table 72 can also be adjusted by a screw mechanism (not shown). The gap between the through hole provided in the top plate of the upper housing 11 and the lifting rod 71 is closed by a sliding guide member 75, which slides back and forth while maintaining a sealed state with the lifting rod 71. Allows movement. In order to obtain the stability during the reciprocating movement of the lifting rod 71, a guide rail mechanism 76, which is schematically shown only by a line in FIG. 1, is provided. As shown in detail in FIG. 5, the sealing connection between the replaced exchange tube part 3 and the cutting remaining tube part 2b is performed in advance by the exchange tube part 3.
The seal flange member 6 attached to the
It is realized by moving to the joint part.
The feeder mechanism 80 includes a blade member 81 erected on the seal flange member 6, a feed screw 82 that is screwed into a screw hole provided in the blade member 81, and an exchangeable contact with one end of the feed screw 82. Stopper plate 8 erected on pipe 3
3, and a rotary operation body 85 for engaging with the other end of the feed screw 82 and rotating the same. The rotating operation body 85 penetrates through the side wall of the lower housing 12 so that it can be operated from outside the housing. Reference numeral 84 denotes a guide seal member that allows a seal between the lower housing 12 and the rotation operation body 85 and reciprocation and rotation of the rotation operation body 85. At the stage when the exchange pipe section 3 is arranged at a predetermined position, the feed screw 82 is engaged with the turning operation body 66 and the feed screw is turned, whereby the seal flange member 6 moves to the joint. For this purpose, the blade member 81, the feed screw 82, the stopper plate 83, and the seal flange member 6 are mounted on the exchange pipe section 3 in advance. More specifically, since the exchange pipe portion 3 includes the gate valve 3a, an extension pipe 3b is attached to a connection port of the gate valve 3a, and the seal flange member 6 and the like are attached to the extension pipe 3b. I have. In FIG. 1, reference numeral 90 denotes a shielding shutter provided in the lower housing 12 to divide the inner space of the housing into upper and lower portions, which is known per se, and is shown here only by a dashed line. Hereinafter, the working process of the existing pipe replacement apparatus 1 will be described with reference to FIGS. 8 to 12; FIG. 1 shows a state in which a pit is excavated on the ground and the existing pipe 2 including the gate valve 3a to be replaced is exposed. Is shown. First, in the pit, the existing pipe exchange device 1 is assembled using a support frame material (not shown) placed on the ground, and a part of the existing pipe cut by the cutting device in the sealed housing. Is exchanged with a corresponding exchange pipe part by the holding elevating device. The following description will be given in order. 1) The first member 12a of the lower housing 12 and the second member 12a of the lower housing 12 are sealed so that the existing pipes 2 located on both sides of the cutting and removing pipe portion are externally sealed.
The member 12b is assembled so as to sandwich the existing pipe 2. 2) The divided rotary blade unit 20 and the divided guide support unit 30 are assembled so that the rotary blade 22 of the cutting device 4 is located at a predetermined cutting position, and the whole is fixed to the lower housing 12 using the pedestal 32. At this time, the pedestal 32
Alternatively, the guide support portion 30 can be fixed to the existing pipes 2 located on both sides of the cutting and removing pipe portion by using the existing pipe base 33. What is important here is that the guide support portion 30 is fixed to a fixing member located outside of the cutting and removing tube portion in the axial direction. 3) Sprocket and rotary blade unit 20 on motor 41 side
The chain 52 is hung on the sprocket wheel 21 of the vehicle and connected so that power can be transmitted. 4) The elevating rod 71 of the holding elevating device 5 provided in the upper housing 11 is lowered, and the cutting and removing tube portion 2a is held by the holding attachment 72. 5) The upper housing 11 is hermetically mounted on the lower housing 12 to hermetically seal the inside of the housing. FIG. 9 shows this state. 6) By rotating the rotary blade unit 20 forward by the motor 41, the rotary blade 22 is circulated around the cutting and removing tube portion, and is advanced radially inward by the action of the feed mechanism 60 to thereby cut and remove the cutting and removing tube portion. Cut 2a. At this time, if the water flowing out of the existing pipe fills the inside of the housing, no further flow out occurs, and the flow of water through the existing pipe is maintained. 7) By rotating the rotary blade unit 20 in the reverse direction, the rotary blade 22 is circulated around the cutting and removing pipe portion and is stepped radially outward to keep the rotary blade 22 away from the existing pipe outer peripheral surface. 8) The cut-off pipe section 2a cut by moving the lifting rod 71 up to the raised position is moved to the internal region of the upper housing 11. 9) Activate the shielding shutter 90 to seal the space under the housing. FIG. 9 shows this state. In this state where the lower space of the housing including the existing pipe portion is sealed, even if the upper housing 11 is separated from the lower housing 12, the flow of the tap water in the existing pipe is maintained. 10) Open the upper housing 11, and cut and remove the pipe 2a.
In place of the above, a new partition valve 3a and the exchange pipe section 3 having the seal flange members 6 attached to both ends thereof are attached to the holding attachment 72 of the holding elevating device 5. 11) The upper housing 11 is moved closer to the lower housing 12 together with the holding / raising / lowering device 5, and the upper housing 11 and the lower housing 12 are hermetically connected to each other.
To open the lower housing space and the upper housing space. 12) The elevating rod 71 of the holding elevating device 5 is lowered to the lowering position, and the replacement pipe part 3 held by the holding attachment 72 is positioned at the cutting position of the existing pipe. FIG. 11 shows this state. 13) Feeder mechanism 8 operated from outside the housing
0, the seal flange member 6 is slid to the joint between the existing pipe 2b and the replacement pipe section 3. FIG. 12 shows this state. 14) The upper and lower housings 11 and 12, the holding / lifting device 5 and the cutting device 4 are removed, and the existing pipe replacement device 1 is disassembled. By the above-described operation steps, the replacement of a part of the existing pipe is completed without obstructing the flow of the fluid in the existing pipe, here, tap water.

Another embodiment FIG. 13 shows an existing pipe exchange device 10 as another embodiment of the present invention.
0 is shown. The existing pipe replacement device 100 is different from the one described above in that the driving unit 140 of the cutting device 4 is installed at an appropriate location near the top plate of the upper housing 11, so that the cutting device 4 The transmission means 150 for transmitting power to the sprocket wheel 21 is provided along the holding and lifting device 5. The transmission means 150 includes a first transmission shaft 151 which is connected to the drive means 140 by a gear mechanism or a chain mechanism.
A second transmission shaft 153 connected to the transmission shaft 151 via a bevel gear mechanism 152, driving sprockets 154 provided at both ends of the second transmission shaft 153, the driving sprocket 154 and the sprocket wheel 21 of the rotary blade unit 20; And a chain 155 that can be hung on. The first transmission shaft 151 is rotatably disposed in the elevating pipe 171 of the holding elevating device 5 formed as a cylindrical body, and its lower end extends into the shaft case 156 attached to the lower end of the elevating pipe 171. Extending. Shaft case 15
A second transmission shaft 153 that extends in the horizontal direction is rotatably disposed in 6. Both ends of the second transmission shaft 153 protrude from the shaft case 156, and the protruding portions are provided with drive sprockets 154, respectively. Axle case 156 and consequently drive sprocket 154
Is moved up and down together with the elevating pipe 171. Therefore, when the elevating pipe 171 is raised, the driving sprocket 154 and the sprocket wheel 2 of the rotary blade unit 20 are moved.
The connection with 1 must be broken. For this purpose, as shown in detail in FIG. 14, a chain guide mechanism 160 that makes the chain 155 wound around the drive sprocket 154 mesh only with the upper arc portion of the sprocket wheel 21 of the rotary blade unit 20 is provided. Provided. The chain guide mechanism 160 includes a boomerang-shaped arm member 161 and the arm member 161.
And a roller 162 rotatably supported at both ends of the arm member 161.
Attached to the end face. As is apparent from FIG. 14, the length of the chain 155 hangs between the two rollers 162 when the chain is not meshed with the sprocket wheel 21, but is arcuate between the two rollers 162 when the chain is meshed with the sprocket wheel 21. Are determined. The roller 162 has a simple disk shape to guide the chain 155 between the link plates of the chain in order to avoid interference with the teeth of the sprocket wheel 21, and its outer peripheral surface is substantially flat. is there. Instead of such a chain guide mechanism 160, a chain release mechanism 1 as shown in FIG.
65 can be provided. This chain removal mechanism 16
5 can be formed as a catch rod that pulls the chain 155 laterally from outside the housing. This is similar to a transmission such as a bicycle. When the chain 155 is driven while pulling the chain 155 to the side, the chain 155 can be easily removed from the drive sprocket 154. Further, the second transmission shaft 153 and the rotary blade unit 20
The power transmission between the sprocket wheel 21 of FIG.
It is also possible to use a gear transmission mechanism 190 as shown in FIG. In this case, it is convenient to round each tooth tip of the small-diameter gear 191 and the large-diameter gear 192 to prevent the tips of the tooth tips from colliding with each other when the gears mesh with each other due to the approach of the gears, and to be stretched. In all the above embodiments, the water pipe has been described as an example of the existing pipe.
Of course, the present invention can be applied to pipelines for transporting fluids such as gas, oil, powder, and similar fluids.

[0008]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an existing pipe replacement device according to the present invention.

FIG. 2 is a schematic side view showing an existing pipe cutting device.

FIG. 3 is a sectional view showing a main part of the cutting apparatus before a cutting step.

FIG. 4 is a sectional view showing a main part of the cutting device during a cutting step.

FIG. 5 is a sectional view showing a feeder mechanism of the seal flange member.

FIG. 6 is a sectional view showing a guide support portion fixed to an existing pipe.

FIG. 7 is a schematic diagram showing the positioning of the holding attachment and the cradle.

FIG. 8 is a schematic diagram showing a work process of replacing an existing pipe by an existing pipe replacing apparatus.

FIG. 9 is a schematic view showing a work process of replacing an existing pipe by the existing pipe replacing apparatus.

FIG. 10 is a schematic view showing a work process of replacing an existing pipe by the existing pipe replacing apparatus.

FIG. 11 is a schematic diagram showing a work process of replacing an existing pipe by the existing pipe replacing apparatus.

FIG. 12 is a schematic view showing a work process of replacing an existing pipe by the existing pipe replacing apparatus.

FIG. 13 is a longitudinal sectional view showing another embodiment of the existing pipe replacement device according to the present invention.

FIG. 14 is a schematic view showing a chain guide mechanism of the existing pipe replacement device according to FIG. 13;

FIG. 15 is a schematic view showing a chain removing mechanism.

FIG. 16 is a schematic diagram showing a gear transmission mechanism for transmitting power between the second transmission shaft and the rotary blade unit.

[Explanation of symbols]

 2 Existing Pipe 2a Cutting Removal Pipe 2b Cutting Remaining Pipe 4 Existing Pipe Cutting Device 5 Holding Elevating Device 6 Seal Flange Member 10 Housing 12 Lower Region 20 Rotating Blade Unit 21 Sprocket Wheel 22 Rotating Blade 22a Main Blade 22b Chamfering Blade Unit 30 guide support unit 31 guide disk 40 drive unit 41 electric motor 42 extension shaft 50 transmission means 60 feed mechanism 63 screw rod 64 gear 65 contact piece 80 feeder mechanism 82 feed screw 85 rotary operating body 90 shielding shutter 154 sprocket wheel 155 chain 160 Chain guide mechanism 165 Chain removal mechanism 190 Gear transmission mechanism X Existing pipe shaft center

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 1/024 F16L 55/00 F16L 55/18

Claims (9)

(57) [Claims] An existing pipe (2) in a sealed housing (10).
An existing pipe cutting device (4) used for an existing pipe replacement device for replacing and attaching a replacement pipe portion corresponding to the cut / removed tube portion after cutting and removing a part of the existing pipe cutting device (4).
The guide support unit (3) rotatably supports the rotary blade unit (20) having the rotary blade (22) around the existing pipe axis (X).
0) and the rotary blade unit (20) via a transmission means (50).
In those and a driving portion for driving (40), the guide support section (30), sealing off the cut off tube section of the existing pipe (2a) than the cut leaving pipe portion (2b) To fit into the lower area (12) of the housing, or to the housing (10)
If it is configured so that it can be fixed to the internal cutting residual pipe part (2b)
In both cases , the rotary blade (22) is a main blade that radially cuts the existing pipe.
Part (22a) and the main blade part for removing the burr of the cutting part
(22a) and the beveled blade (22b) inclined with respect to (22a).
An existing pipe cutting device, characterized in that it has been installed. 2. Existing pipe (2) in a sealed housing (10).
After cutting and removing a part of the
Used for existing pipe replacement equipment that replaces and replaces pipe replacement parts.
An existing pipe cutting device (4), wherein the existing pipe cutting device (4)
Is a rotary blade unit (20) having a rotary blade (22).
A guide support (3) that is rotatably supported around the axis (X)
0) and the rotary blade unit (20) via a transmission means (50).
A device provided with a drive unit (40) for driving
The guide support section (30) is a pipe for cutting and removing the existing pipe.
The above-mentioned housing for sealingly fitting the remaining cutting tube portion (2b) other than the portion (2a).
In the lower area of the jing (12) or in the housing (10)
An existing structure that can be fixed to the internal cutting residual pipe (2b)
In an existing pipe replacement device using a pipe cutting device, the cutting and removing pipe portion (2a) is held and lifted and exchanged.
Ascending and descending positions
Holding elevating device (5) which can be raised and lowered between
Between the lowered position and the interior of the housing (10)
Shutter (90) that separates into a sealed state with the lower space
Are provided in the housing (10), and the drive
A moving part (40) is installed outside the housing (10) and the transmission
Means (50) is provided in the holding lifting device (5), further, the transmission means (50), a gear transmission mechanism as the final transmission mechanism for transmitting power to the rotary blade unit (20) side (19
An existing pipe exchange device characterized by using (0). 3. An existing pipe (2) in a sealed housing (10).
After cutting and removing a part of the
Used for existing pipe replacement equipment that replaces and replaces pipe replacement parts.
An existing pipe cutting device (4), wherein the existing pipe cutting device (4)
Is a rotary blade unit (20) having a rotary blade (22).
A guide support (3) that is rotatably supported around the axis (X)
0) and the rotary blade unit (20) via a transmission means (50).
A device provided with a drive unit (40) for driving
The guide support section (30) is a pipe for cutting and removing the existing pipe.
The above-mentioned housing for sealingly fitting the remaining cutting tube portion (2b) other than the portion (2a).
In the lower area of the jing (12) or in the housing (10)
An existing structure that can be fixed to the internal cutting residual pipe (2b)
In an existing pipe replacement device using a pipe cutting device, the cutting and removing pipe portion (2a) is held and lifted and exchanged.
Ascending and descending positions
Holding elevating device (5) which can be raised and lowered between
Between the lowered position and the interior of the housing (10)
Shutter (90) that separates into a sealed state with the lower space
Are provided in the housing (10), and the drive
A moving part (40) is installed outside the housing (10) and the transmission
Means (50) is provided in the holding lifting device (5), further, the transmission means (50), and using a chain transmission mechanism as the final transmission mechanism for transmitting power to the rotary blade unit (20) side , The sprocket wheel on the drive side
A chain guide mechanism (160) that allows the chain (155) wound around the (154) to mesh only with the upper arc portion of the sprocket wheel (21) on the rotary blade unit (20) side.
An existing pipe exchange device characterized by being provided with: 4. An existing pipe (2) in a sealed housing (10).
After cutting and removing a part of the
Used for existing pipe replacement equipment that replaces and replaces pipe replacement parts.
An existing pipe cutting device (4), wherein the existing pipe cutting device (4)
Is a rotary blade unit (20) having a rotary blade (22).
A guide support (3) that is rotatably supported around the axis (X)
0) and the rotary blade unit (20) via a transmission means (50).
A device provided with a drive unit (40) for driving
The guide support section (30) is a pipe for cutting and removing the existing pipe.
The above-mentioned housing for sealingly fitting the remaining cutting tube portion (2b) other than the portion (2a).
In the lower area of the jing (12) or in the housing (10)
An existing structure that can be fixed to the internal cutting residual pipe (2b)
In an existing pipe replacement device using a pipe cutting device, the cutting and removing pipe portion (2a) is held and lifted and exchanged.
Ascending and descending positions
Holding elevating device (5) which can be raised and lowered between
Between the lowered position and the interior of the housing (10)
Shutter (90) that separates into a sealed state with the lower space
Are provided in the housing (10), and the drive
A moving part (40) is installed outside the housing (10) and the transmission
Means (50) is provided in the holding lifting device (5), further, the transmission means (50) is used a chain transmission mechanism as the final transmission mechanism for transmitting power to the rotary blade unit (20) side , where existing pipe replacement device, wherein the holding lifting device (5) Remove the chain Remove the chain when moving to the raised position from the lowered position of the mechanism (165) that is provided for this chain transmission mechanism . 5. Existing pipe (2) in a sealed housing (10).
After cutting and removing a part of the
Used for existing pipe replacement equipment that replaces and replaces pipe replacement parts.
An existing pipe cutting device (4), wherein the existing pipe cutting device (4)
Is a rotary blade unit (20) having a rotary blade (22).
A guide support (3) that is rotatably supported around the axis (X)
0) and the rotary blade unit (20) via a transmission means (50).
A device provided with a drive unit (40) for driving
The guide support section (30) is a pipe for cutting and removing the existing pipe.
The above-mentioned housing for sealingly fitting the remaining cutting tube portion (2b) other than the portion (2a).
In the lower area of the jing (12) or in the housing (10)
An existing structure that can be fixed to the internal cutting residual pipe (2b)
In an existing pipe replacement device using a pipe cutting device, the cutting and removing pipe portion (2a) is held and lifted and exchanged.
Ascending and descending positions
Holding elevating device (5) which can be raised and lowered between
Between the lowered position and the interior of the housing (10)
Shutter (90) that separates into a sealed state with the lower space
Doo is provided in the housing (10), further, said exchange tubes
Seal members slidably fitted to both ends of the part
(6) Feeder mechanism to slide to the connection position with the existing pipe
(80) is provided, and the feeder mechanism (80) includes the seal flange member.
A feed screw provided in (6) (82), and characterized in that the feed screw (82) and engageable with the rotational operation member to seal through said lower housing (85) and are provided existing pipe replacement device that. 6. An existing pipe (2) in a sealed housing (10).
After cutting and removing a part of the
Used for existing pipe replacement equipment that replaces and replaces pipe replacement parts.
An existing pipe cutting device (4), wherein the existing pipe cutting device (4)
Is a rotary blade unit (20) having a rotary blade (22).
A guide support (3) that is rotatably supported around the axis (X)
0) and the rotary blade unit (20) via a transmission means (50).
A device provided with a drive unit (40) for driving
The guide support section (30) is a pipe for cutting and removing the existing pipe.
The above-mentioned housing for sealingly fitting the remaining cutting tube portion (2b) other than the portion (2a).
In the lower area of the jing (12) or in the housing (10)
An existing structure that can be fixed to the internal cutting residual pipe (2b)
In an existing pipe replacement device using a pipe cutting device, the cutting and removing pipe portion (2a) is held and lifted and exchanged.
Ascending and descending positions
Holding elevating device (5) which can be raised and lowered between
Between the lowered position and the interior of the housing (10)
Shutter (90) that separates into a sealed state with the lower space
Are provided in the housing (10), and the drive
A moving part (40) is installed outside the housing (10) and the transmission
Means (50) are provided on the holding elevating device (5), and seal flaps are slidably fitted to both ends of the exchange pipe section.
The sliding member (6) slides to the connection position with the existing pipe.
A feeder mechanism (80) , wherein the feeder mechanism (80) includes the seal flange member.
A feed screw provided in (6) (82), and characterized in that the feed screw (82) and engageable with the rotational operation member to seal through said lower housing (85) and are provided existing pipe replacement device that. 7. A cutting device in a sealed housing (10).
Holding part of the existing pipe (2) cut by (4)
(5) An existing pipe replacement method for replacing with a corresponding replacement pipe section according to (5), characterized by comprising the following steps: 1) Existing pipes located on both sides of the cutting and removing pipe section (2a). (2)
2) A guide housing (3) of the cutting device (4) is installed so that the rotary blade (22) of the cutting device (4) is positioned at a predetermined cutting position.
0) is fixed to a fixing member located outside of the cutting and removing pipe portion (2a) in the axial center direction. 3) A transmission means connects the driving portion (40) and the rotary blade unit (20).
(5) The power is connected so as to be able to transmit power via the (50). 4) The cutting and removing tube (2a) is held by a holding portion of a holding / elevating device (5) provided in the upper housing. 6) By rotating the rotary blade unit (20) in the forward direction, the rotary blade (22) is rotated around the cutting and removing pipe portion (2a) and radially inside the housing. Step 7) to cut the cutting and removing tube portion (2a). 7) By rotating the rotary blade unit (20) in the reverse direction, the rotary blade (22) is rotated around the cutting and removing tube portion (2a). And stepping radially outward to move the rotary blade (22) away from the outer peripheral surface of the existing pipe (2). 8) The cut and removed pipe section (2a) is held by the holding and lifting device (5). 9) Create a shielding shutter (90) located below the raised position. And, to seal the housing lower space, 10) to open the housing upper space, the cutting removal pipe section
In place of (2a), an exchange pipe part having seal flange members (6) attached to both ends is attached to the holding part. 11) The upper space of the housing is closed and the lower space of the housing is opened by the shielding shutter (90). 12) Lowering the exchange pipe section held by the holding section of the holding elevating device (5) to a cutting position of the existing pipe; 13) Feeder mechanism (8) operated from outside the housing
0), the seal flange member (6) is connected to the existing pipe (2).
14) Remove the upper and lower housings, holding and lifting device (5) and cutting device (4). 8. A guide support section (30) of said cutting device (4).
In the step of fixing the guide support portion (3
0) is fixed to the lower housing.
An existing pipe replacement method according to claim 7 . 9. A guide support section (30) of said cutting device (4).
In the step of fixing the guide support portion (3
The method for replacing an existing pipe according to claim 7 , wherein 0) is fixed to a remaining cutting pipe located on both sides of the cutting removing pipe (2a).