JP2019184030A - Pore formation method for fluid pipe and branch passage formation device used in pore formation method - Google Patents

Abstract

To provide a pore formation method in which a pore part enabling a flowing-down direction of fluid flowing at a fluid pipe to be changed over to a branch passage side without being influenced by a valve body for preventing immersion of fluid into a work area is formed under a non-interrupted flow state and provide a branch passage formation device used in the pore formation method.SOLUTION: This invention comprises a step for enclosing an outer peripheral surface of a fluid pipe 1 by a housing 3 under a sealed state, a step for cutting and forming a branch hole 10 part communicated with the branch flow passage at the fluid pipe 1 in a housing 3 by using an end mill, and a step for cutting and forming a valve hole part 11 into which a valve body 27 can be inserted and arranged at the fluid pipe 1 within the housing 3 by using the end mill.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a hole forming method for forming a hole used in flowing a fluid from a fluid pipe to a branch channel in an uninterrupted state, and a branch path forming apparatus used for the hole forming method.

  In the case of a fluid pipe line configured by connecting a plurality of fluid pipes, there are cases in which repair or laying is performed on an existing fluid pipe in an uninterrupted state. In such a case, a hole is formed in the fluid pipe on both sides of the predetermined section where the work is performed, and a bypass flow channel that is a branch flow channel communicating with the hole is temporarily provided, and two holes are provided between the holes. A method is widely known in which a valve body is installed and cut off to make a work area where 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 a fluid pipe is enclosed in a sealed manner by a housing, a hole having a substantially circular shape 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 smaller than the inner diameter of the hole so as not to completely close the hole. When the valve body is inserted, the valve body abuts on one edge of the hole in the direction of the fluid pipe axis, and fluid enters the working area. The bypass channel and the inside of the fluid pipe are communicated with each other through a gap between the other edge of the hole in the fluid pipe axial direction and the valve body.

Japanese Patent Laying-Open No. 2010-281367 (page 13, FIG. 12)

  As described above, in Patent Document 1, the bypass channel and the inside of the fluid pipe can be communicated with each other while preventing the fluid from entering the working area with one hole, and the working efficiency is excellent. On the other hand, in order to prevent the intrusion of fluid into 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 round hole formed by the hole saw and the valve body is necessary. The road cross-sectional area is limited, and depending on the flow environment of the fluid pipe, there are cases where the fluid flowing into the bypass channel becomes excessive or insufficient, and an appropriate flow rate cannot be supplied to the bypass channel. Also, when inserting the valve body, the valve body is brought into contact with the edge of one side of one hole to prevent fluid from entering the work area of the pipe line. In order to do so, high accuracy was required at the insertion position of the valve body.

  The present invention has been made paying attention to such problems, and the flow direction of the fluid flowing through the fluid pipe is shifted 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 an uninterrupted flow state and a branch path forming device used in the hole forming method.

In order to solve the above problems, a method for forming a hole in a fluid pipe according to the present invention includes:
A hole forming method for forming a hole used in flowing a fluid from a fluid pipe to a branch channel in an uninterrupted state,
Enclosing the outer peripheral surface of the fluid pipe in a sealed manner by a housing;
Cutting and forming a branch hole portion communicating with the branch flow channel in the fluid pipe in the casing using an end mill;
And a step of cutting and forming a valve hole portion in which the valve element can be inserted and arranged in the fluid pipe in the casing using an end mill.
According to this feature, the cutting surface of the fluid pipe is formed by the valve body that is formed through the valve hole portion that is formed with the branch hole portion that communicates with the branch flow path and the valve hole portion into which the valve body can be inserted and arranged. And the flow path on the downstream side of the valve hole portion is closed by contacting the inner peripheral surface, and the fluid flowing down from the upstream side passes through the inside of the housing only through the branch hole portion to the branch flow channel. Will flow. In other words, the flow passage cross-sectional area can be designed without being affected by the valve body in the branch hole, so that not only can an appropriate flow rate be passed to the branch flow path, Since the cutting surface is water-stopped, excellent water-stopping performance can be exhibited.

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

The valve hole portion and the branch hole portion are cut and formed at positions separated in the tube axis direction of the fluid pipe.
According to this feature, the valve hole and the branch hole are formed separately, so that the valve body does not affect the flow of the fluid from the branch hole to the branch channel, and is suitable for the branch channel. A large flow rate.

The branch path forming device used in the hole forming method for the fluid pipe of the present invention is:
A branch path forming device for forming a hole used in flowing a fluid from a fluid pipe to a branch channel in an uninterrupted state,
Surrounding the outer peripheral surface of the fluid pipe in a sealed manner, and having a casing having a branch portion communicating with the branch flow path,
The branch portion has a space in which a valve hole portion into which a valve element formed in the fluid pipe can be inserted and disposed and a branch hole portion communicating with the branch flow path face each other.
According to this feature, it is not necessary to provide a branching portion that communicates with the branching hole portion and the valve hole portion in the case, so that the sealing performance can be secured and the structure of the case is simplified to reduce the manufacturing cost. can do.

The branch portion has 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 channel can be smoothly guided to the branch portion.

It is a partial front sectional view which shows the housing | casing which comprises the branch path formation apparatus in the Example of this invention. It is a partial front sectional view showing a state in which a cutting device is attached to the housing and a branch hole is formed in the fluid pipe. It is a partial front sectional view which shows the state which moved the housing | casing and the cutting device to the pipe-axis direction of the fluid pipe | tube. It is a partial front sectional view which shows the state which attached the 2nd moving apparatus. It is explanatory drawing which shows a mode that a housing | casing and a cutting device are moved to the circumferential direction of a fluid pipe | tube, and the hole part for valves is formed. It is a partial front sectional view which shows the state which attached the valve apparatus to the housing | casing. It is a partial front sectional view which shows the state which inserted and arrange | positioned the valve body in the hole part for valves. It is a sectional side view which shows the state which inserted and arrange | positioned the valve body in the hole part for valves. (A) is a top view which shows the state which attached the cover body to the housing | casing, (b) is a partial front sectional view similarly. (A) is a partial front sectional view showing a state in which the anticorrosion core is attached to the branch hole portion, and (b) is a partial front sectional view showing a state in which the anticorrosion core is attached to the valve hole portion. (A) is a partial front sectional view showing a state in which a cap is attached to a branch hole, and (b) is a partial front sectional view showing a state in which a cap is attached to a valve hole.

  EMBODIMENT OF THE INVENTION The form for implementing the branch path formation apparatus used for the hole part formation method to the fluid pipe | tube based on this invention and the hole part formation method is demonstrated below based on an Example.

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

  The pipe constituent member according to the present embodiment is used as a water supply, and is constituted 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 pipe line, and these branch pipes are laid in each home / facility.

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

  Reference numeral 2 in FIG. 2 is a branching path forming device, which takes into account the convenience of the supply area when repairing or replacing a specific pipe constituent member due to problems such as deterioration over time. It is a device used in a continuous flow state. More specifically, each of the pipe components is installed on both sides in the axial direction so as to sandwich a place to be constructed, and each of the fluid pipes 1 is formed with a hole, and then is connected to the hole. For example, a work area in which a bypass channel is temporarily installed, two valves are further installed between the holes, and the fluid flowing down the fluid pipe is switched to the bypass channel side so that fluid does not enter between the valves. In this work area, the device enables the work of removing or repairing the pipe portion of a specific fluid pipe. In this embodiment, only the branch path forming apparatus on one side across the work area will be described, and the description of the other branch path forming apparatus will be omitted because it has the same configuration. In this embodiment, the fluid in the fluid pipe is clean water. However, the fluid is not limited to clean water in this embodiment. For example, industrial water, agricultural water, sewage, or a gas-liquid mixture of gas, gas, and liquid. It does not 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 the casing 3 that is externally fitted in a sealed manner at a predetermined portion of the fluid pipe 1 as a pipe constituent member, and the casing 3 shown in FIG. 2. And a valve device 5 that is 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 divided portions are opposed to each other. The part is formed with a flange, and is connected to each other by a fastening member inserted through the flange. The casing 3 has a substantially cylindrical shape having an inner diameter larger than the outer diameter of the fluid pipe 1, and an inner peripheral surface (only one side is shown in FIG. 2) of the front and rear ends of the casing 3 is annular. The seal member 9 is pressed in a sealed manner between the inner surface of the casing 3 and the outer surface of the fluid pipe 1 when the casing 3 is externally fitted to the fluid pipe 1. It has become so. In addition, a sealing member (not shown) is disposed and sealed in a divided portion between the divided housings. In addition, the housing | casing 3 may be divided | segmented into 3 or more parts not only in 2 divisions.

  The first divided housing 31 is formed with a branch portion 31 a extending upward, and the branch portion 31 a is formed with a working opening 31 b communicating with the inside of the housing 3. Moreover, the branch part 31a has the taper surface part 31d which spreads in a pipe-axis direction toward a bypass flow path side.

  In the present embodiment, the work valve 6 is integrally provided at the branch portion 31a so that the work opening 31b can be opened and closed. The working valve 6 includes a valve seat portion 6a, a valve housing portion 6b, a valve body 7 capable of closing the working opening 31b by fitting from the valve housing portion 6b to the valve seat portion 6a, and the valve body 7 An operation rod 8 that is connected and can be moved forward and backward is provided. The work opening 31b is formed to have a size that allows an end mill 21 (see FIG. 2) of the cutting device 4 (described later) and a valve body 27 (see FIG. 6) of the valve device 5 to be inserted.

  As shown in FIG. 2, the cutting device 4 includes an end mill 21 (cutting means) capable of cutting on both the front end 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 that guides the end mill 21, the drive portion 25 for rotationally driving the end mill 21, the operation end portion 22 a that moves the rod 22 back and forth, and the flange portion 31 c of the branch portion 31 a of the housing 3 are hermetically connected. And a cylindrical connection body 24 that allows the rod 22 to pass through in a sealed manner. The end mill 21 can be accommodated in the connection body 24, the rod 22 penetrates the connection body 24, and the guide body 23, the drive unit 25, and the operation end 22 a are disposed outside the connection body 24. Yes. Note that, as a means for moving the rod 22 back and forth in the vertical direction, the operation end portion 22a of the present embodiment is manually operated. However, for example, it may be movable up and down by a driving force such as a motor.

  Next, the cutting process for forming the branch hole 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. 21 is cut so as to penetrate the side wall of the top of the fluid pipe 1 in the radial direction. With this cutting, the fluid in the fluid pipe 1 flows into the connection body 24 through the housing 3 and the work opening 31b. However, as described above, the housing 3 and the connection body 24 are sealed. Therefore, the fluid is prevented from flowing out of the branch path forming device 2. When cutting, the drain valve (not shown) is opened and the chips are discharged. By this cutting process, the branch hole 10 is cut and formed in the side wall of the fluid pipe. In the present embodiment, the branch hole 10 is cut at the top of the fluid pipe 1. However, the present invention is not limited to this, and for example, the branch hole at any position in the circumferential direction of the fluid pipe 1, such as a tube bottom or a pipe side. 10 may be cut.

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

  The first moving device 50 is fixed to the outer peripheral surface of the fluid pipe 1 that is spaced upstream from 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 distal end (downstream side) of the hydraulic jack 52, and a U-shaped side cross-sectional view that fits over a part of the convex portion 3a that protrudes to the outer diameter side in the circumferential direction of the housing 3. Fitting member 53 (see FIG. 2). Specifically, the fixing jig 51 is composed of two members that are divided into upper and lower parts in this embodiment, and there are a plurality of screws 54, 54,... That can advance and retract in the radial direction of the fixing jig 51 in the circumferential direction. .. Are fixedly attached to the fluid pipe 1 by advancing the screws 54, 54,... In the inner diameter direction and biting into the outer peripheral surface of the fluid pipe 1. The branch path forming device 2 can be moved in the pipe axis direction with respect to the fluid pipe 1 by extending and contracting the hydraulic jack 52. That is, the first moving device 50 functions as a means for moving the cutting means in the tube axis direction of the fluid pipe 1.

  Note that the fixing jig 51 is not limited to 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 may be set as appropriate. Further, in the present embodiment, the hydraulic jack 52 is exemplified as means for applying the moving force in the tube axis direction to the casing 3 in the first moving device 50, but the present invention is not limited to this, and the casing Any member can be used as long as it can apply a moving force in the tube axis direction to the tube 3.

  Next, as shown in FIG. 3, the fixing jig 51 and the fitting member 53 are operated to be separated by the hydraulic jack 52 of the first moving device 50 described above. Thereby, the cutting device 4 fixed to the housing 3 and the housing 3 is moved in the tube axis direction with respect to the fluid tube 1. At this time, the housing | casing 3 is stopped in the position which cuts and forms the hole 11 for valves mentioned later, with the branch hole part 10 arrange | positioned in this housing | casing 3. FIG. Therefore, the sealed state is maintained without the fluid in the casing 3 leaking due to the movement of the casing 3.

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

  Specifically, the drive transmission unit 81 can be rotated by a drive motor, a speed reducer, or the like (not shown), and the rotation shaft 83 disposed in parallel to the tube axis direction of the fluid pipe 1 and the rotation shaft 83. A drive sprocket 84 provided, an endless chain 85 wound around the driven sprocket 82 and the drive sprocket 84, and as 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 so that 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 will be described. The end mill 21 is disposed 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 top of the fluid pipe 1 in the radial direction at the distal end surface of the end mill 21. Further, as shown in FIG. 5, the housing 3 is rotated in one of the circumferential directions of the fluid pipe 1 by driving the second moving device 80 in a state where the end mill 21 is driven to rotate around its axis. Then, the housing | casing 3 is rotated to the other of the circumferential direction. As the housing 3 rotates, 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 11 extending in the circumferential direction on the side wall of the fluid pipe 1 is cut. It is formed. In the present embodiment, the valve hole 11 is cut at the top of the fluid pipe 1. However, the present invention is not limited to this, and for example, the valve hole 11 is provided at any position in the circumferential direction of the fluid pipe 1 such as a pipe bottom or a pipe side. The hole 11 may be cut.

  After the cutting formation of the branch hole portion 10 and the valve hole portion 11 is completed, as shown in FIG. 6, the working valve 6 is closed, the cutting device 4 is removed, and the valve device 5 is installed instead. Attach to 3. In addition, after making the working valve 6 into a closed state, it is preferable to make the valve body 7 temporarily unable to move from the closed state by detachably attaching the fixing member 33 to the tip of the operation rod 8 outside the housing 3. .

  The valve device 5 includes a pipe line portion 26 that is sealed and connected to the housing 3 in a state of communication, a valve body 27 disposed in the pipe line portion 26, and the valve body 27 from the outside to the pipe line It is mainly composed of a rod-shaped valve stem portion 28 for advancing and retracting the inside of the portion 26. The valve stem portion 28 is disposed in a state in which only rotation is permitted and movement in the axial direction is restricted, and an operation end portion 28 a is provided at the upper end of the valve stem portion 28. Further, the pipe section 26 includes a bypass section 29 that opens to the outside, and a pipe member (a partition valve is illustrated by reference numeral 40) that constitutes a bypass flow path can be attached to the flange of the bypass section 29. .

  The valve body 27 is formed with a thin width dimension in the tube 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 work valve 6 is first opened. Since the working valve 6 is opened 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 pipe line portion 26 of the valve device 5. It flows in the tube member 40 constituting the flow path.

  Next, the valve stem portion 28 is rotated to move the valve body 27 in the axial direction of the valve stem portion 28, so that the valve body 27 contacts the cutting surface of the valve hole portion 11 and the inner peripheral surface of the fluid pipe 1. By contacting, 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 through the branch hole portion 10 into the housing 3 (see FIG. 7), and the valve stem portion in the branch portion 31a. 28, further passes through the pipe section 26 of the valve device 5, and flows into the pipe member 40 constituting the bypass flow path via the inner side 29a of the bypass section 29 (see FIG. 8). In addition, the branch part 31a and the valve device 5 serving as a flow path for the fluid flowing out from the branch hole part 10 and the pipe member 40 constitute a bypass flow path. 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. When the downstream end of the divergent shape is formed to be substantially the same as or wider than the width of the valve element 27 in a plan view toward the downstream side of the flow path (see FIG. 9A), the bypass flow This is preferable because the flowability of the road is increased. However, the tapered surface portion 31d does not necessarily have the above-described divergent shape, and may be formed in, for example, a substantially rectangular shape in a plan view.

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

  In this way, the branch hole portion 10 communicating with the bypass flow path and the valve hole portion 11 into which the valve element 27 can be inserted and formed are formed, and the valve hole portion 11 extends in the circumferential direction of the fluid pipe 1. Thus, the movement of the valve body 27 in the tube axis direction can be easily controlled, and the relative position between the valve hole 11 and the valve body 27 can be easily adjusted. The valve body 27 abuts over the cutting surface of the valve hole 11 and the inner peripheral surface of the fluid pipe 1, and the flow path downstream from the valve hole 11 is closed, so that the fluid flows down from the upstream side. Flows through the housing 3 to the bypass flow path 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. Moreover, since the flow path cross-sectional area of the branch hole portion 10 can be designed without being influenced by the valve body 27, an appropriate flow rate to the bypass flow path can be flowed.

  Further, the valve body 27 is made to flow separately from the branch hole portion 10 to the bypass flow path by separately forming the valve hole portion 11, the branch hole portion 10, and the fluid pipe 1 at positions separated in the axial direction. An appropriate flow rate can be allowed to flow to the bypass flow path without affecting the valve hole portion 11 with the valve element 27 inserted and arranged with certainty.

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

  Further, since the valve hole 11 is cut and formed longer in the circumferential direction by using a small-diameter end mill 21 than a hole saw or the like, the width dimension in the tube axis direction can be reduced, and the branch hole 10 and the valve hole 11 can be reduced. The distance in the tube axis direction can be shortened. According to this, the dimension in the tube axis direction of the branch portion 31a of the housing 3 where the branch hole portion 10 and the valve hole portion 11 are opposed to each other can be reduced, and the housing 3 itself can be downsized. The workability for the existing fluid pipe 1 is excellent.

  The branch hole portion 10 and the valve hole portion 11 are both positioned within the dimensions of the branch portion 31 a of the housing 3 in the tube axis direction, and face the branch hole portion 10 and the valve hole portion 11. There is no need to provide each of the branch portions, and therefore there is no need to provide a plurality of work valves 6, the cost for forming the branch path forming device 2 can be reduced, and the series of operations is simplified.

  Moreover, since the branch part 31a of the housing | casing 3 has the taper surface part 31d which spreads in a pipe-axis direction toward the valve apparatus 5 side (bypass flow path side), it flows toward the bypass flow path from the branch hole part 10. FIG. The fluid can be smoothly guided to the branch portion.

  After the construction is completed, the valve rod portion 28 is operated to retract the valve element 27, and then the work valve 6 is closed. Thereafter, the valve device 5 is removed from the housing 3, and the lid 30 is fixed to the flange portion 31 c of the branch portion 31 a of the housing 3 instead of the valve device 5 as shown in FIGS. 9 (a) and 9 (b). Then, the distal end side of the working opening 31b is closed.

  Moreover, after construction is completed, the anticorrosion core which prevents generation | occurrence | production of the rust to a cutting surface can also be attached to the branch hole part 10 and the hole part 11 for valves.

  More specifically, as shown in FIG. 10A, the anticorrosion core 45 </ b> A attached to the branch hole portion 10 has a rigid core material 46 with a substantially L-shaped cross section extending, and the core material 46. It consists of the elastic member 47 which coat | covered the outer peripheral surface, and rust prevention is carried out by the elastic member 47 contacting over substantially the whole cutting surface of the branch hole part 10. FIG. In addition, the locking portion 46b that protrudes to a larger diameter than 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 engaging portion 46c that has a larger diameter than the branch hole portion 10 formed at the front end portion is in contact with the inner peripheral surface of the fluid pipe 1 to prevent the fluid pipe 1 from coming off.

  Further, the anticorrosion device 41A for attaching the anticorrosion core 45A to the branch hole portion 10 is inserted into the insertion base 42 in a sealed state through the insertion base 42 fixed to the flange portion 31c, and is advanced and retracted from the outside. A handle shaft 43 that can be used, and a holding portion 43 a that can removably hold the anticorrosion core 45 </ b> A at the tip of the handle shaft 43.

  As shown in FIG. 10 (b), the anticorrosion core 45 </ b> B attached to the valve hole 11 includes a rigid core material 56 having a substantially L-shaped cross section and an outer peripheral surface of the core material 56. And an elastic member 57 having a substantially L-shaped cross section extending thereto, and the elastic member 57 is in contact with the cutting surface of the valve hole 11 to prevent rust. In addition, a locking portion 57 a that protrudes to a larger diameter than the valve hole portion 11 formed in the elastic member 57 is in contact with the outer peripheral surface of the fluid pipe 1 to prevent over-insertion.

  In addition, the lower surface of the locking portion 56a that has a larger diameter than the elastic member 57 formed at the rear end of the core member 56 includes a tapered surface 56b that extends downward toward the inner diameter side, and this tapered surface 56b is anticorrosive. It can come into contact with a tapered surface 46a formed at the rear end of the core member 46 of the core 45A.

  As shown in FIG. 10 (b), the anticorrosion device 41B for attaching the anticorrosion core 45B to the valve hole portion 11 is hermetically sealed with the insertion base material 55 fixed to the flange portion 31c and the insertion base material 55. The handle shaft 58 is inserted in a state and can be moved forward and backward from the outside, and 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, first, as shown in FIG. 10A, the anticorrosion is applied to the flange portion 31c of the branch portion 31a of the housing 3. By fixing the apparatus 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 branching portion 31a of the housing 3 instead of the anticorrosion device 41A, and the first moving device 50 (not shown) is used here. After the housing 3 is moved in the axial direction of the fluid pipe 1, the anticorrosion core 45 </ b> B is inserted into the valve hole 11 by operating the handle shaft 58.

  At this time, the anticorrosion core 45A is prevented from coming off in the radial direction by the taper surface 46a formed on the core member 46 of the anticorrosion core 45A coming into contact with the taper surface portion 31d of the branch portion 31a of the case 3 due to the movement of the case 3. Is done. Further, the taper surface 56b of the locking portion 56a of the core material 56 of the anticorrosion core 45B abuts on the taper surface 46a formed on the core material 46 of the anticorrosion core 45A, and the anticorrosion core 45B is removed in the radial direction of the anticorrosion core 45A. Acts as a stop. Further, the handle shaft 58 of the anticorrosion device 41B is fixed to the insertion base material 55 so as to be immovable by a fixing means (not shown), whereby the radial prevention between the anticorrosion core 45A and the anticorrosion core 45B is completed.

  In addition, 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, whereby the tip of the handle shaft 62 is The cap 63 </ b> A that is detachably held is inserted and arranged in the branch hole portion 10, and the branch hole portion 10 is sealed. Next, as shown in FIG. 11 (b), a 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) is attached here. After the housing 3 is moved 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 cap 63A moves, the taper surface 63a formed at the rear end of the cap 63A comes into contact with the taper surface portion 31d of the branch portion 31a of the housing 3 and is prevented from coming off in the radial direction. Further, the cap shaft 63B is prevented from coming off in the radial direction by fixing the handle shaft 64 of the closing device 61B to the insertion base member 65 so as not to move by a fixing means (not shown). The tapered surface 64a formed at the front end of the handle shaft 64 is in contact with the tapered surface 63a formed at the rear end of the cap 63A, thereby further strengthening the cap 63A in which the fluid pressure acts greatly on the upstream side in the radial direction. Can be secured.

  After the closure of the branch hole 10 and the valve hole 11 by the cap 63A and the cap 63B is completed, the valve body 7 and the operating rod 8 of the work valve 6 are removed from the housing 3 and further opened in the valve housing 6b. The closing member 66 is fixed and sealed.

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

  For example, in the above-described embodiment, the form in which the valve hole 11 is formed after the branch hole 10 is cut and formed in the cutting process is illustrated, but the present invention is not limited to this. The branch hole 10 may be formed after the use hole 11 is formed.

  Also, in the step of cutting the branch hole 10, similarly to the valve hole 11, the casing 3 and the end mill 21 are rotated in the circumferential direction of the fluid pipe 1 using the second moving device 80, The fluid pipe 1 may be cut and formed in a shape extending in the circumferential direction. According to this, the flow path cross-sectional area of the branch hole 10 can be easily adjusted.

  Moreover, it is not restricted to the structure which cuts and forms the branch hole part 10 and the valve hole part 11 separately, You may cut and form so that these may continue. For example, if the valve hole 11 is cut and formed long in the circumferential direction and the valve element 27 can be sandwiched between both sides in the tube axis direction, for example, although not particularly illustrated, the branch hole 10 is non-circular. It may be formed in a shape, or may be formed by communicating the branch hole 10 and the valve hole 11.

  Moreover, in the said Example, although the branch hole part 10 and the valve hole part 11 demonstrated by the example formed by the same end mill 21, it is not restricted to this, For example, a branch part is 2 in the pipe-axis direction of a housing | casing. Two branch holes 10 and valve holes 11 may be formed by using different end mills. In this case, a moving means and a moving process for moving the casing and the end mill along the fluid pipe as in the first moving device 50 are not necessary.

  Further, the work valve 6 may be formed separately from the housing 3 and may be configured to be detachable from the housing 3, and a drive mechanism such as a screw or hydraulic pressure is used to advance and retract the valve body. It may be.

  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 symmetrical position in the circumferential direction with respect to the branch portion 31a. 3 is formed with a groove or the like on the inner peripheral surface thereof that faces the branch hole portion 10 and forms a space communicating with the branch portion 31a in the circumferential direction, or a branch portion that faces the branch hole portion 10 is separately provided. It is good also as a structure which connects the pipe member which comprises a bypass flow path to a branch part.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Branching path formation apparatus 3 Housing | casing 4 Cutting apparatus 5 Valve apparatus 6 Work valve 10 Branching hole part 11 Valve hole part 21 End mill 26 Pipe line part 27 Valve body 28 Valve stem part 29 Bypass part 30 Lid 31a Branch Portion 31b Work opening 31d Tapered surface portion 40 Pipe member (bypass flow path)
41A, 41B Corrosion-proof device 45A, 45B Corrosion-proof core 46 Core material 46a Tapered surface 47 Elastic member 50 First moving device 56 Core material 56b Tapered surfaces 61A, 61B Closure devices 63A, 63B Cap 63a Tapered surface 64a Tapered surface 80 Second moving device

Claims (5)

A hole forming method for forming a hole used in flowing a fluid from a fluid pipe to a branch channel in an uninterrupted state,
Enclosing the outer peripheral surface of the fluid pipe in a sealed manner by a housing;
Cutting and forming a branch hole portion communicating with the branch flow channel in the fluid pipe in the casing using an end mill;
And a step of cutting and forming a valve hole in which the valve element can be inserted and arranged in the fluid pipe in the casing using an end mill.   2. The hole according to claim 1, wherein the casing is moved together with an end mill in a direction of a pipe 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.   3. The hole forming method according to claim 1, wherein the valve hole and the branch hole are cut and formed at positions separated in a pipe axis direction of the fluid pipe. A branch path forming device for forming a hole used in flowing a fluid from a fluid pipe to a branch channel in an uninterrupted state,
Surrounding the outer peripheral surface of the fluid pipe in a sealed manner, and having a casing having a branch portion communicating with the branch flow path,
The branch portion has a space in which a valve hole portion into which a valve body formed in the fluid pipe can be inserted and disposed and a branch hole portion communicating with the branch flow channel face each other. apparatus.   5. The branch path forming apparatus according to claim 4, wherein the branch section has a tapered surface section that guides fluid toward the branch flow path side.

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