JP7061004B2 - A branch path forming device used for a method for forming a hole in a fluid pipe and a method for forming a hole. - Google Patents

Description

The present invention relates to a hole forming method for forming a hole used when flowing a fluid from a fluid pipe to a branch flow path in a continuous flow state, and a branch path forming device used for the hole forming method.

In a fluid pipeline composed of a plurality of fluid pipes connected to each other, the existing fluid pipe may be repaired or re-laid in a continuous flow state. In such a case, holes are formed in the fluid pipe on both sides of the predetermined section to be constructed, a bypass flow path that is a branch flow path communicating with the holes is temporarily provided, and two holes are provided between the holes. A method is widely known in which a valve body is installed and each of the valve bodies is shut off to form a work area in which fluid does not enter between the valve bodies so that construction can be performed in this work area.

For example, in Patent Document 1, the outer peripheral surface of the fluid pipe is surrounded by a housing in a sealed manner, a hole of a substantially perfect circle is formed in the fluid pipe using a hole saw in the housing, and a valve body is inserted into the hole. Deploy. This valve body has a width dimension smaller than the inner diameter of the hole so as not to completely block the hole, and when inserted, it abuts on one edge of the hole in the axial direction of the fluid pipe to allow fluid to enter the working area. The bypass flow path and the inside of the fluid pipe are communicated with each other through a gap between the valve body and the other edge of the hole in the axial direction of the fluid pipe.

Japanese Unexamined Patent Publication No. 2010-281637 (page 13, FIG. 12)

As described above, in Patent Document 1, the bypass flow path and the inside of the fluid pipe can be communicated with each other while preventing the fluid from entering the work area with one hole, which is excellent in work efficiency. On the other hand, in order to prevent fluid from entering the work area, it is necessary to use a valve body of a predetermined size and shape, so that the flow in the gap between the hole of the perfect circle formed by the hole saw and the valve body. The cross-sectional area of the road is limited, and depending on the flow environment of the fluid pipe, the fluid flowing to the bypass flow path may be excessive or too small, and an appropriate flow rate may not be able to flow to the bypass flow path. In addition, when inserting the valve body, the valve body is brought into contact with the one-sided edge of one hole to prevent fluid from entering the working area of the pipeline, but this water stoppage is ensured. In order to do so, high accuracy was required for the insertion position of the valve body.

The present invention has been made by paying attention to such a problem, and the flow direction of the fluid flowing through the fluid pipe is directed to the branch flow path side without being affected by the valve body that prevents the fluid from entering the work area. It is an object of the present invention to provide a hole forming method for forming a switchable hole in a continuous flow state and a branch path forming device used for the hole forming method.

In order to solve the above-mentioned problems, the method for forming a hole in a fluid tube of the present invention is used.
It is a hole forming method for forming a hole used when flowing a fluid from a fluid pipe to a branch flow path in a continuous flow state.
The process of enclosing the outer peripheral surface of the fluid tube in a sealed manner with a housing,
A step of cutting and forming a branch hole portion communicating with the branch flow path in the fluid pipe in the housing using an end mill.
It is characterized by comprising a step of cutting and forming a valve hole portion in which a valve body can be inserted and arranged in the fluid pipe in the housing by using an end mill.
According to this feature, a branch hole portion communicating with the branch flow path and a valve hole portion into which the valve body can be inserted and arranged are formed, respectively, and the cutting surface of the fluid pipe is formed by the valve body inserted through the valve hole portion. And by contacting the inner peripheral surface, the flow path on the downstream side of the valve hole is closed, and the fluid flowing down from the upstream side passes through the inside of the housing only through the branch hole and enters the branch flow path. It will flow. That is, since the branch hole portion can be designed to have a cross-sectional area of the flow path without being affected by the valve body, not only can an appropriate flow rate flow to the branch flow path, but also the valve body allows the valve hole portion to flow. Since the cutting surface is water-stopped, excellent water-stopping property can be exhibited.

The housing is moved together with an end mill in the direction of the tube axis of the fluid pipe, and the branch hole portion and the valve hole portion are cut and formed using the same end mill.
According to this feature, by moving the housing and the end mill in the pipe axis direction of the fluid pipe, the branch hole portion and the valve hole portion can be cut and formed by one end mill, and the housing can be miniaturized. be able to.

It is characterized in that the valve hole portion and the branch hole portion are cut and formed at positions separated from each other in the pipe axis direction of the fluid pipe.
According to this feature, by forming the valve hole portion and the branch hole portion separately, the valve body does not affect the fluid flow from the branch hole portion to the branch flow path, and is suitable for the branch flow path. It is possible to flow a large flow rate.

The branch path forming apparatus used in the method for forming a hole in a fluid pipe of the present invention is
It is a branch path forming device that forms a hole used when flowing a fluid from a fluid pipe to a branch flow path in a continuous flow state.
A housing having a branch portion that surrounds the outer peripheral surface of the fluid pipe in a sealed manner and communicates with the branch flow path is provided.
The branch portion is characterized by having a space in which a valve hole portion into which a valve body formed in the fluid pipe can be inserted and arranged and a branch hole portion communicating with the branch flow path face together.
According to this feature, since it is not necessary to provide a branch hole portion and a branch portion communicating with the valve hole portion in the housing, the sealing property can be ensured and the structure of the housing is simplified to reduce the manufacturing cost. can do.

The branch portion is characterized by having a tapered surface portion that guides the fluid toward the branch flow path side.
According to this feature, the fluid flowing from the branch hole portion toward the branch flow path can be smoothly guided to the branch portion.

It is a partial front sectional view which shows the housing which comprises the branch path forming apparatus in an Example of this invention. It is a partial front sectional view showing a state in which a cutting device is attached to a housing and a branch hole portion is formed in a fluid pipe. It is a partial front sectional view showing a state in which the housing and the cutting device are moved in the pipe axis direction of the fluid pipe. It is a partial front sectional view which shows the state which attached the 2nd moving device. It is explanatory drawing which shows the mode that the housing and the cutting apparatus are moved in the circumferential direction of a fluid tube, and the valve hole portion is formed. It is a partial front sectional view showing a state in which a valve device is attached to a housing. It is a partial front sectional view which shows the state which the valve body is inserted and arranged in the valve hole part. It is a side sectional view which shows the state which the valve body is inserted and arranged in the valve hole part. (A) is a plan view showing a state in which a lid is attached to a housing, and (b) is also a partial front sectional view. (A) is a partial front sectional view showing a state in which an anticorrosion core is attached to a branch hole portion, and (b) is a partial front sectional view showing a state in which an anticorrosion core is attached to a valve hole portion. (A) is a partial front sectional view showing a state in which a cap is attached to a branch hole portion, and (b) is a partial front sectional view showing a state in which a cap is attached to a valve hole portion.

A mode for carrying out a hole forming method in a fluid pipe and a branch path forming device used in the hole forming method according to the present invention will be described below based on examples.

The branch path forming apparatus used in the hole forming method and the hole forming method in the fluid pipe according to the embodiment will be described with reference to FIGS. 1 to 11. For convenience of explanation, the left side of the paper in FIG. 1 is the upstream side of the fluid pipe, and the right side is the downstream side.

The pipeline constituent member according to this embodiment is used as a water supply, and is configured by connecting a plurality of connecting members such as a plurality of fluid pipes and valves (only the fluid pipe 1 is shown in the figure) and is buried in the ground. ing. A plurality of branch pipes (not shown) are connected to the fluid pipeline, and these branch pipes are laid in each home / facility.

The fluid pipe 1 shown in FIG. 1 is made of ductile cast iron, is formed in a substantially circular shape in cross section, and its inner peripheral surface is covered with an epoxy resin layer 1a. The fluid pipe according to the present invention may be made of other metal such as cast iron or steel, or may be made of concrete, vinyl chloride, polyethylene, polyolefin or the like. Furthermore, the inner peripheral surface of the fluid tube is not limited to the epoxy resin layer, and may be coated with, for example, mortar, or an appropriate material may be coated on the inner peripheral surface of the fluid tube by powder coating.

Reference numeral 2 in FIG. 2 is a branch path forming device, and the convenience of the supply area is taken into consideration when repairing or replacing a specific pipeline component member due to a defect such as deterioration over time. It is a device used in a continuous flow state. Specifically, it is installed on both sides of the pipeline constituent member in the axial direction so as to sandwich the part to be constructed, and a hole is formed in the fluid pipe 1 and then a branch flow path communicating with the hole. For example, a bypass flow path is temporarily installed, and two valve bodies are installed between the holes to switch the fluid flowing down the fluid pipe to the bypass flow path side, and a work area where the fluid does not enter between these valve bodies. It is a device that enables work such as removal or repair of a pipe portion of a specific fluid pipe in this work area. In this embodiment, only the branch path forming device on one side sandwiching the work area will be described, and the description will be omitted because the branch path forming device on the other side has the same configuration. In this embodiment, the fluid in the fluid pipe is clean water, but it is not limited to the clean water of this embodiment, for example, industrial water, agricultural water, sewage, gas or a gas-liquid mixture of gas and liquid. It doesn't matter.

First, the structure of the branch path forming apparatus 2 will be described. As shown in FIG. 2, the branch path forming device 2 is attached to a housing 3 that is hermetically fitted to a predetermined position of a fluid pipe 1 as a pipeline component member and a housing 3 shown in FIG. It is configured together with a cutting device 4 to be used and a valve device 5 attached to the housing 3 in place of the cutting device 4 shown in FIG.

As shown in FIGS. 1 and 2, the housing 3 of the present embodiment has a vertically divided structure including a first divided housing 31 and a second divided housing 32, and these are divided so as to face each other. A flange is formed in the portion, and the portions are connected to each other by a fastening member inserted through the flange. The housing 3 has a substantially cylindrical shape having an inner diameter larger than the outer diameter of the fluid pipe 1, and is annular to the inner peripheral surfaces of both front and rear ends of the housing 3 (only one side is shown in FIG. 2). The seal member 9 is arranged, and when the housing 3 is fitted onto the fluid pipe 1, the seal member 9 is pressed in a sealed manner between the inner surface of the housing 3 and the outer surface of the fluid pipe 1. It has become so. Further, a sealing member (not shown) is also arranged and sealed in the divided portion between the divided housings. The housing 3 is not limited to the two divisions, and may be divided into three or more portions.

The first divided housing 31 is formed with a branch portion 31a extending upward, and the branch portion 31a is formed with a working opening 31b communicating with the inside of the housing 3. Further, the branch portion 31a has a tapered surface portion 31d that extends in the pipe axis direction toward the bypass flow path side.

In this embodiment, the branch portion 31a is integrally provided with a work valve 6 so that the work opening portion 31b can be opened and closed. The work valve 6 is provided in a valve body 7 capable of closing the working opening 31b by fitting the valve seat portion 6a, the valve accommodating portion 6b, and the valve accommodating portion 6b into the valve seat portion 6a, and the valve body 7. It is equipped with an operation rod 8 that is connected and can be moved forward and backward. Further, the working opening 31b is formed to have a size through which the end mill 21 (see FIG. 2) of the cutting device 4 and the valve body 27 (see FIG. 6) of the valve device 5 to be described later can be inserted.

As shown in FIG. 2, the cutting device 4 has an end mill 21 (cutting means) capable of cutting on both the tip surface and the outer peripheral surface, a rod 22 connected above the end mill 21, and the rod 22 in the vertical direction. The guide body 23 for guiding to, the drive unit 25 for rotationally driving the end mill 21, the operation end portion 22a for moving the rod 22 up and down in the vertical direction, and the flange portion 31c of the branch portion 31a of the housing 3 are hermetically connected. , A tubular connecting body 24 through which the rod 22 is hermetically penetrated is provided inside. The end mill 21 can be accommodated in the connecting body 24, the rod 22 penetrates the connecting body 24, and the guide body 23, the driving unit 25, and the operating end portion 22a are arranged outside the connecting body 24. There is. As a means for moving the rod 22 up and down, the operation end 22a of this embodiment is manually operated, but for example, it may be able to move up and down by a driving force of a motor or the like.

Next, the cutting process for forming the branch hole portion will be described. First, the work valve 6 is opened, the end mill 21 is rotated, and as shown in FIG. 2, the rod 22 is lowered through the work opening 31b to advance the end mill 21 in the axial direction. The tip surface of the 21 is cut so as to penetrate the side wall of the pipe top of the fluid pipe 1 in the radial direction. Along with this cutting, the fluid in the fluid pipe 1 flows into the housing 3 and the working opening 31b to the connecting body 24 side, but as described above, the housing 3 and the connecting body 24 are sealed. Therefore, it is prevented that the fluid flows out of the branch path forming device 2. When cutting, the drain valve (not shown) is opened to discharge chips. By this cutting step, a branch hole portion 10 is cut and formed on the side wall of the fluid pipe. In this embodiment, the branch hole portion 10 is cut at the top of the fluid pipe 1, but the branch hole portion is not limited to this, and the branch hole portion is not limited to this, for example, at an arbitrary position in the circumferential direction of the fluid pipe 1, such as the bottom of the pipe or the side of the pipe. 10 may be cut.

After the cutting formation of the branch hole portion 10 is completed, the operation end portion 22a is operated to retract the end mill 21 in the axial direction and separate it from the outer peripheral surface of the fluid pipe 1. Before or after the completion of the cutting process of the branch hole portion 10, the first moving device 50 shown in FIG. 2 is erected on the housing 3 and the fluid pipe 1.

The first moving device 50 is a fixing jig 51 fixed to the outer peripheral surface of the fluid pipe 1 separated to the upstream side of the housing 3, and is connected to the fixing jig 51 and arranged in parallel with the fluid pipe 1. The hydraulic jack 52 and the side cross-sectional view U-shape that is provided at the tip (downstream side) of the hydraulic jack 52 and is externally fitted to a part of the convex portion 3a that protrudes toward the outer diameter side in the circumferential direction of the housing 3. The fitting member 53 (see FIG. 2) is provided. Specifically, in this embodiment, the fixing jig 51 is composed of two members divided into upper and lower parts, and a plurality of screws 54, 54, ... It is formed, and each screw 54, 54, ... Can be fixedly attached to the fluid pipe 1 by advancing in the inner diameter direction and biting into the outer peripheral surface of the fluid pipe 1. Then, by expanding and contracting the hydraulic jack 52, the branch path forming device 2 can be moved with respect to the fluid pipe 1 in the pipe axis direction. That is, the first moving device 50 functions as a means for moving the cutting means in the pipe axis direction of the fluid pipe 1.

The fixing jig 51 is not limited to the two divisions, and may be divided into three or more members. Further, the number of screws 54 is not limited to the number shown in the figure, and is set to an appropriate number. Further, in the present embodiment, the hydraulic jack 52 is exemplified as a means for applying a moving force in the pipe axis direction to the housing 3 in the first moving device 50, but the present invention is not limited to this, and the housing is not limited to this. Anything that can give a moving force in the pipe axis direction to 3 may be used, and for example, a member that expands and contracts in the pipe axis direction by a screw may be used.

Next, as shown in FIG. 3, the hydraulic jack 52 of the first moving device 50 described above is used to operate the fixing jig 51 and the fitting member 53 so as to be separated from each other. As a result, the housing 3 and the cutting device 4 fixed to the housing 3 are moved in the pipe axis direction with respect to the fluid pipe 1. At this time, the housing 3 is stopped at a position where the valve hole portion 11, which will be described later, is to be cut and formed while the branch hole portion 10 is arranged in the housing 3. Therefore, when the housing 3 moves, the fluid in the housing 3 does not leak, and the sealed state is maintained.

Next, as shown in FIG. 4, the second moving device 80 is attached to the fluid pipe 1 in place of the first moving device 50. The second moving device 80 is a driven sprocket fixedly connected to a drive transmission unit 81 fixed to the fluid pipe 1 and one side end portion of the housing 3 (upstream side end portion of the housing 3 in this embodiment). It is mainly composed of 82 and.

Specifically, the drive transmission unit 81 has a rotation shaft 83 that is rotatable by a drive motor, a speed reducer, or the like (not shown) and is arranged in parallel with the pipe axis direction of the fluid pipe 1, and a rotation shaft 83. The drive sprocket 84 provided and the endless chain 85 wound around the driven sprocket 82 and the drive sprocket 84 are provided, and the drive sprocket 84 rotates about the rotation shaft 83. A rotational driving force is applied to the driven sprocket 82 via the endless chain 85, and the driven sprocket 82 rotates in the circumferential direction of the fluid pipe 1. That is, the second moving device 80 functions as a means for moving the cutting means in the circumferential direction of the fluid pipe 1.

Next, the cutting process for forming the valve hole portion will be described. The end mill 21 is arranged at a position separated from the branch hole portion 10 in the pipe axis direction, and is cut so as to penetrate the side wall of the pipe top portion of the fluid pipe 1 in the radial direction at the tip surface of the end mill 21. Further, as shown in FIG. 5, in a state where the end mill 21 is rotationally driven around its axis, the second moving device 80 is driven to rotate the housing 3 in one of the circumferential directions of the fluid pipe 1. After that, the housing 3 is rotated to the other side in the circumferential direction. Along with the rotation of the housing 3, the end mill 21 of the cutting device 4 is rotated by a predetermined angle in the circumferential direction of the fluid pipe 1, so that the valve hole portion 11 extending in the circumferential direction is cut on the side wall of the fluid pipe 1. It is formed. In this embodiment, the valve hole 11 is cut at the top of the fluid pipe 1, but the valve is not limited to this, and the valve is used at an arbitrary position in the circumferential direction of the fluid pipe 1, for example, the bottom of the pipe or the side of the pipe. The hole 11 may be cut.

After the cutting formation of the branch hole portion 10 and the valve hole portion 11 is completed, the working valve 6 is closed, the cutting device 4 is removed, and the valve device 5 is replaced with the housing, as shown in FIG. Attach to 3. After closing the work valve 6, it is preferable that the fixing member 33 is detachably attached to the tip of the operating rod 8 outside the housing 3 so that the valve body 7 is temporarily immovable from the closed state. ..

The valve device 5 has a pipeline portion 26 in which the inside is communicated with the housing 3 in a sealed manner, a valve body 27 arranged in the pipeline portion 26, and a valve body 27 from the outside. It is mainly composed of a rod-shaped valve rod portion 28 for advancing and retreating in the portion 26. The valve rod portion 28 is arranged in a state where only rotation is permitted and movement in the axial direction is restricted, and an operation end portion 28a is provided at the upper end of the valve rod portion 28. Further, the pipeline portion 26 is provided with a bypass portion 29 that opens to the outside, and a pipe member (the sluice valve is exemplified by reference numeral 40) constituting the bypass flow path can be attached to the flange of the bypass portion 29. ..

The valve body 27 has a thin width dimension in the pipe axis direction so as to have substantially the same outer peripheral shape as the inner peripheral shape of the valve hole portion 11 formed in the circumferential direction of the fluid pipe 1. As shown in FIG. 6, when the valve hole 11 is closed by the valve body 27, the working valve 6 is first opened. By opening the work valve 6 at this time, the fluid flowing down from the upstream side of the fluid pipe 1 is bypassed through the branch hole portion 10 and the valve hole portion 11 and further through the pipeline portion 26 of the valve device 5. It flows in the pipe member 40 constituting the flow path.

Next, the valve rod portion 28 is rotated to advance the valve body 27 in the axial direction of the valve rod portion 28, and the valve body 27 hits the cutting surface of the valve hole portion 11 and the inner peripheral surface of the fluid pipe 1. By bringing them into contact with each other, the flow path on the downstream side of the valve hole 11 is closed. As a result, as shown by the white arrows in FIGS. 7 and 8, the fluid flowing down from the upstream side passes from the branch hole portion 10 into the housing 3 (see FIG. 7), and the valve rod portion in the branch portion 31a. It passes around 28, further passes through the conduit portion 26 of the valve device 5, passes through the inner side 29a of the bypass portion 29, and flows into the pipe member 40 constituting the bypass flow path (see FIG. 8). The branch portion 31a, which is a flow path for the fluid flowing out of the branch hole portion 10, and the valve device 5 form a bypass flow path together with the pipe member 40. Here, the tapered surface portion 31d formed in the branch portion 31a has an inclined shape that is separated from the outer peripheral surface of the fluid pipe 1 in a front view toward the downstream side of the bypass flow path (see FIG. 9B), and is bypassed. It has a divergent shape in a plan view toward the downstream side of the flow path (see FIG. 9A), and when the downstream end of the divergent shape is formed to be substantially the same as or wider than the width of the valve body 27, a bypass flow occurs. This is preferable because it increases the circulation of the road. However, the tapered surface portion 31d does not necessarily have the above-mentioned divergent shape, and may be formed, for example, in a substantially rectangular shape in a plan view.

By using the above-mentioned branch path forming device 2 on both sides of a predetermined space of the pipeline constituent member, a working area where fluid does not enter is formed between the valve bodies 27 and 27, and the flow is uninterrupted in this working area. Construction can be done at.

In this way, a branch hole portion 10 communicating with the bypass flow path and a valve hole portion 11 into which the valve body 27 can be inserted and arranged are formed, and the valve hole portion 11 extends in the circumferential direction of the fluid pipe 1. Therefore, the movement of the valve body 27 in the pipe axis direction can be easily regulated, and the relative positions of the valve hole portion 11 and the valve body 27 can be easily aligned. The valve body 27 abuts on the cut surface of the valve hole 11 and the inner peripheral surface of the fluid pipe 1, and the flow path on the downstream side of the valve hole 11 is closed, so that the fluid flowing down from the upstream side is closed. Will flow into the bypass flow path through the inside of the housing 3 only through the branch hole portion 10, and the flow direction of the fluid flowing through the fluid pipe 1 can be switched to the bypass flow path side without leakage. Further, since the branch hole portion 10 can design the cross-sectional area of the flow path without being affected by the valve body 27, an appropriate flow rate can flow to the bypass flow path.

Further, by separately cutting and forming the valve hole portion 11, the branch hole portion 10 and the fluid pipe 1 at positions separated from each other in the axial direction, the valve body 27 allows the fluid to flow from the branch hole portion 10 to the bypass flow path. An appropriate flow rate can be flowed to the bypass flow path without affecting the flow path, and the valve hole portion 11 can be reliably closed by the valve body 27 inserted and arranged.

Further, by moving the housing 3 and the end mill 21 in the axial direction of the fluid pipe 1 using the first moving device 50, the branch hole portion 10 and the valve hole portion 11 are cut and formed by one end mill 21. This makes it possible to reduce the size of the housing 3 and reduce the number of connection openings for connecting the end mill 21 and the like formed in the housing 3, effectively preventing fluid leakage.

Further, since the valve hole portion 11 is formed by cutting longer in the circumferential direction using an end mill 21 having a smaller diameter than that of a hole saw or the like, the width dimension in the pipe axis direction can be reduced, and the branch hole portion 10 and the valve hole portion 11 can be formed. The distance in the pipe axis direction can be shortened. According to this, the dimension of the branch portion 31a of the housing 3 in which the branch hole portion 10 and the valve hole portion 11 face each other in the pipe axis direction can be reduced, and eventually the housing 3 itself can be miniaturized. Excellent workability for the existing fluid pipe 1.

Further, the branch hole portion 10 and the valve hole portion 11 are both configured to be located within the dimensions of the branch portion 31a of the housing 3 in the pipe axis direction, and face the branch hole portion 10 and the valve hole portion 11. Since it is not necessary to provide each branch portion, therefore, it is not necessary to provide a plurality of work valves 6, the cost of forming the branch path forming device 2 can be reduced, and a series of operations can be simplified.

Further, since the branch portion 31a of the housing 3 has a tapered surface portion 31d that extends in the pipe axis direction toward the valve device 5 side (bypass flow path side), the fluid flows from the branch hole portion 10 toward the bypass flow path. The fluid can be smoothly guided to the branch portion.

After the construction is completed, the valve rod portion 28 is operated to regress the valve body 27, and then the working valve 6 is closed. After that, the valve device 5 is removed from the housing 3, and as shown in FIGS. 9A and 9B, the lid 30 is fixed to the flange portion 31c of the branch portion 31a of the housing 3 instead of the valve device 5. Then, the tip side of the work opening 31b is closed.

Further, after the construction is completed, the anticorrosion core for preventing the generation of rust on the cutting surface can be attached to the branch hole portion 10 and the valve hole portion 11.

More specifically, as shown in FIG. 10A, the anticorrosion core 45A attached to the branch hole portion 10 has a rigid core material 46 having a substantially L-shaped cross section extended, and the core material 46. It is composed of an elastic member 47 that covers the outer peripheral surface, and the elastic member 47 comes into contact with the cut surface of the branch hole portion 10 over substantially the entire surface to prevent rust. Further, the locking portion 46b projecting to a diameter larger than that of the branch hole portion 10 formed at the rear end portion of the core material 46 abuts on the outer peripheral surface of the fluid pipe 1 to prevent over-insertion, and the core material 46 The structure is such that the engaging portion 46c projecting to a diameter larger than that of the branch hole portion 10 formed at the front end portion abuts on the inner peripheral surface of the fluid pipe 1 to prevent disconnection.

Further, the anticorrosion device 41A for attaching the anticorrosion core 45A to the branch hole portion 10 is inserted into the insertion base material 42 fixed to the flange portion 31c and the insertion base material 42 in a sealed state, and is operated to move forward and backward from the outside. A possible handle shaft 43 and a holding portion 43a capable of detachably holding the anticorrosion core 45A at the tip of the handle shaft 43 are provided.

As shown in FIG. 10B, the anticorrosion core 45B attached to the valve hole portion 11 has a rigid core material 56 having a substantially L-shaped cross section extended and an outer peripheral surface of the core material 56. It is composed of an elastic member 57 having a substantially L-shaped cross section extended by covering with the elastic member 57, and the elastic member 57 comes into contact with the cutting surface of the valve hole portion 11 to prevent rust. Further, the locking portion 57a, which is formed in the elastic member 57 and has a diameter larger than that of the valve hole portion 11, abuts on the outer peripheral surface of the fluid pipe 1 to prevent over-insertion.

Further, the lower surface of the locking portion 56a projecting to a diameter larger than that of the elastic member 57 formed at the rear end of the core material 56 is provided with a tapered surface 56b extending downward toward the inner diameter side, and the tapered surface 56b is corrosion-proof. It is possible to abut on the tapered surface 46a formed at the rear end of the core material 46 of the core 45A.

As shown in FIG. 10B, the anticorrosion device 41B for attaching the anticorrosion core 45B to the valve hole portion 11 is sealed to the insertion base material 55 fixed to the flange portion 31c and the insertion base material 55. It is inserted in the state and can be moved forward and backward from the outside, and has a handle shaft 58 fixed to the core material 56 of the anticorrosion core 45B at the tip.

When the anticorrosion core 45A and the anticorrosion core 45B are attached to the branch hole portion 10 and the valve hole portion 11, as shown in FIG. 10A, first, anticorrosion is provided to the flange portion 31c of the branch portion 31a of the housing 3. By fixing the device 41A and operating the handle shaft 43, the anticorrosion core 45A is inserted and arranged in the branch hole portion 10. Next, as shown in FIG. 10B, the anticorrosion device 41B is fixed to the flange portion 31c of the branch portion 31a of the housing 3 instead of the anticorrosion device 41A, and a first moving device 50 (not shown here) is used. After moving the housing 3 in the axial direction of the fluid pipe 1, the anticorrosion core 45B is inserted and arranged in the valve hole portion 11 by operating the handle shaft 58.

At this time, due to the movement of the housing 3, the anticorrosion core 45A comes into contact with the tapered surface portion 31d of the branch portion 31a of the housing 3 and the tapered surface 46a formed on the core material 46 of the anticorrosion core 45A to prevent it from coming off in the radial direction. Will be done. Further, the tapered surface 56b of the locking portion 56a of the core material 56 of the anticorrosion core 45B abuts on the tapered surface 46a formed on the core material 46 of the anticorrosion core 45A, and the anticorrosion core 45B comes off in the radial direction of the anticorrosion core 45A. Functions as a stop. Further, by fixing the handle shaft 58 of the anticorrosion device 41B to the insertion base material 55 immovably by a fixing means (not shown), the radial prevention of the anticorrosion core 45A and the anticorrosion core 45B is completed.

Further, after the construction is completed, the valve body 7 of the work valve 6 can be removed. Specifically, as shown in FIG. 11A, first, the closing device 61A is hermetically fixed to the flange portion 31c of the branch portion 31a of the housing 3, and the handle shaft 62 is operated to operate the tip of the handle shaft 62. The cap 63A detachably held in the branch hole portion 10 is inserted and arranged in the branch hole portion 10 to seal the branch hole portion 10. Next, as shown in FIG. 11B, the closing device 61B is hermetically fixed to the flange portion 31c of the branch portion 31a of the housing 3 in place of the closing device 61A, and the first moving device 50 (not shown here) is attached. After moving the housing 3 in the axial direction of the fluid pipe 1, the cap 63B fixed to the tip of the handle shaft 64 is inserted into the valve hole 11 by operating the handle shaft 64 of the closing device 61B. Arrange and seal the valve hole 11.

As the housing 3 moves, the cap 63A abuts on the tapered surface portion 31d of the branch portion 31a of the housing 3 with the tapered surface 63a formed at the rear end of the cap 63A and is prevented from coming off in the radial direction. Further, by fixing the handle shaft 64 of the closing device 61B to the insertion base material 65 so as not to be movable by a fixing means (not shown), these caps 63B are prevented from coming off in the radial direction. The tapered surface 64a formed at the tip of the handle shaft 64 abuts on the tapered surface 63a formed at the rear end of the cap 63A, and more strongly in the radial direction of the cap 63A on which the fluid pressure greatly acts on the upstream side. Can be prevented from coming off.

After the branch hole portion 10 and the valve hole portion 11 are completely closed by the caps 63A and 63B, the valve body 7 and the operation rod 8 of the work valve 6 are removed from the housing 3 and further opened in the valve accommodating portion 6b. The closing member 66 is hermetically fixed and closed.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions that do not deviate from the gist of the present invention are included in the present invention. Will be.

For example, in the above embodiment, in the cutting step, a form in which the branch hole portion 10 is cut and formed and then the valve hole portion 11 is formed is exemplified, but the present invention is not limited to this, and for example, the valve. After forming the hole portion 11, the branch hole portion 10 may be formed.

Further, also in the step of cutting and forming the branch hole portion 10, the housing 3 and the end mill 21 are rotated in the circumferential direction of the fluid pipe 1 by using the second moving device 80 as in the valve hole portion 11. It may be formed by cutting into the fluid pipe 1 in a shape extending in the circumferential direction. According to this, the cross-sectional area of the flow path of the branch hole portion 10 can be easily adjusted.

Further, the structure is not limited to the structure in which the branch hole portion 10 and the valve hole portion 11 are separately cut and formed, and the branch hole portion 10 and the valve hole portion 11 may be cut and formed so as to be continuous. For example, if the valve hole portion 11 is formed by cutting long in the circumferential direction and the valve body 27 can be sandwiched on both sides in the pipe axis direction, for example, although not particularly shown, the branch hole portion 10 is non-circular. It may be formed into a shape, or the branch hole portion 10 and the valve hole portion 11 may be communicated with each other.

Further, in the above embodiment, the branch hole portion 10 and the valve hole portion 11 have been described by the example formed by the same end mill 21, but the present invention is not limited to this, and for example, the branch portion is provided with 2 branches in the pipe axis direction of the housing. A cutting device may be attached to each branch portion, and the branch hole portion 10 and the valve hole portion 11 may be formed by using different end mills. In this case, there is no need for a moving means and a moving step for moving the housing and the end mill along the fluid pipe, such as the first moving device 50.

Further, the work valve 6 may be formed separately from the housing 3 and may be detachably configured with respect to the housing 3, and a drive mechanism such as a screw or hydraulic pressure may be used for the advancing / retreating operation of the valve body. You may do it.

Further, the branch hole portion 10 and the valve hole portion 11 may be formed at different positions in the circumferential direction, for example, the branch hole portion 10 may be formed at a position symmetrical with respect to the branch portion 31a in the circumferential direction. In No. 3, a concave groove or the like is formed on the inner peripheral surface thereof to form a space facing the branch hole portion 10 and communicating with the branch portion 31a in the circumferential direction, or a branch portion facing the branch hole portion 10 is separately provided. A pipe member constituting the bypass flow path may be connected to the branch portion.

1 Fluid pipe 2 Branch path forming device 3 Housing 4 Cutting device 5 Valve device 6 Work valve 10 Branch hole 11 Valve hole 21 End mill 26 Pipe 27 Valve 28 Valve rod 29 Bypass 30 Lid 31a Branch Part 31b Work opening 31d Tapered surface part 40 Pipe member (bypass flow path)
41A, 41B Anticorrosion device 45A, 45B Anticorrosion core 46 Core material 46a Tapered surface 47 Elastic member 50 First moving device 56 Core material 56b Tapered surface 61A, 61B Closing device 63A, 63B Cap 63a Tapered surface 64a Tapered surface 80 Second moving device

Claims (4)

It is a hole forming method for forming a hole used when flowing a fluid from a fluid pipe to a branch flow path in a continuous flow state.
A step of enclosing the outer peripheral surface of the fluid pipe in a hermetically sealed manner by a housing having a branch portion communicating with the branch flow path .
A step of cutting and forming a branch hole portion communicating with the branch flow path in the fluid pipe in the housing using an end mill.
The valve hole portion in which the valve body can be inserted and arranged in the fluid pipe using an end mill is located at a position separated from the branch hole portion in the pipe axis direction of the fluid pipe, and the branch of the housing. A method for forming a hole portion , comprising: a step of cutting and forming the portion in a position communicating with the branch hole portion . The hole according to claim 1, wherein the housing is moved together with an end mill in the direction of the tube axis of the fluid pipe, and the branch hole portion and the valve hole portion are formed by cutting using the same end mill. Part formation method. It is a branch path forming device that forms a hole used when flowing a fluid from a fluid pipe to a branch flow path in a continuous flow state.
A housing having a branch portion that surrounds the outer peripheral surface of the fluid pipe in a sealed manner and communicates with the branch flow path is provided.
The branch portion of the housing communicates with a valve hole portion into which a valve body formed in the fluid pipe can be inserted and arranged, and communicates with the branch flow path and from the valve hole portion in the pipe axial direction of the fluid pipe. A branch path forming device characterized by having a space in which a branch hole portion formed at a separated position communicates with the branch hole portion. The branch path forming apparatus according to claim 3 , wherein the branch portion has a tapered surface portion that guides a fluid toward the branch flow path side.

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