JP7430771B2 - How to remove fluid tubes - Google Patents

Description

The present invention relates to a flow control device in which a flow control device is installed in an uninterrupted state in a housing that seals a fluid pipe, and a method for installing the flow control device.

Conventionally, when a failure such as a leak occurs in a part of a pipe component that makes up a flow path, a plug device (fluid control) is installed as necessary in the piping around the failed component to prevent flow. At the same time, shut off the water downstream of the plug device, repair the water distribution branch pipe or the downstream branch pipe, or install a switching valve (fluid control) in a non-flow state, and stop the flow through the switching valve. Construction work is being carried out such as temporarily constructing a bypass path to detour around the failed component, and repairing or replacing the component while minimizing the water cutoff area in the vicinity of the failed component (for example, Patent Documents 1 and 2). reference).

In addition, the switching valve controls the flow of fluid toward the main pipeline and the bypass channel by a valve body provided inside, and enables construction in an uninterrupted state without blocking the entire flow channel.

JP2013-7232A (Page 4, Figure 3) Japanese Patent Application Publication No. 2005-240892 (Page 3, Figure 3)

However, in Patent Documents 1 and 2, failures such as leaks occur in the pipes themselves, valves, joints, irregularly shaped pipes, and other members that make up the branch pipes branching from the main pipe (pipe line section). In this case, if the failed component is located near a branch point in the main pipeline, it is not possible to secure installation space for a fluid control device near the failed component in the branch pipeline. In order to shut off the flow of fluid, install fluid control devices on both the upstream and downstream sides of the branch point in the main pipeline, and install a fluid control device downstream of the failed member in the branch pipeline. Therefore, it was necessary to cut off the flow near the failed member and to temporarily construct separate bypass paths to the main pipe side and the branch pipe side. As a result, there are problems in that the number of bypass paths temporarily installed in the flow path increases, the water cutoff area becomes wide, and the construction becomes complicated. At this time, it is possible to install a bypass path through these switching valves by using the fluid control as a switching valve, but this also increases the number of bypass paths that are temporarily installed in the flow path, making the construction complicated. There was the problem of becoming a thing.

The present invention has been made with attention to such problems, and provides a flow restriction device and a flow restriction device installation method that can reduce the number of bypass paths temporarily installed in a flow path and narrow the range of water cutoff. The purpose is to provide

In order to solve the above problems, the flow restriction device of the present invention includes:
a casing for sealingly fitting a conduit section of a fluid pipe and a branch section branching from the conduit section; and a housing installed at a section cut out between the conduit section and the branch section within the casing; and a fluid control for controlling the flow path in the fluid pipe,
The casing is characterized in that it has an opening into which a cutter that can be cut is inserted between the conduit section and the branch section.
According to this feature, the pipe line part and the branch part of the fluid pipe are cut together in a sealed housing with a cutter inserted through the opening, and the cutter is cut inside the housing. By installing a fluid control at a location with no flow interruption, it is possible to simultaneously control the fluid flowing in the pipe direction and the branch direction, reducing the number of temporary bypass passages installed in the flow path and narrowing the area of water cutoff. can.

The casing is characterized in that it has the opening that allows the pipe section to be cut out into a substantially C-shape with the cutter.
According to this feature, the cutting range of the fluid pipe can be reduced by cutting the pipe line part together with the branch part of the fluid pipe into a substantially C-shape with the cutter inserted from the opening. Various devices for attaching the flow restriction device can be downsized.

The fluid pipe is provided with a branch pipe connected to the branch part, and the casing is characterized in that a connecting part between the branch part and the branch pipe is fitted onto the outside in a sealed manner.
According to this feature, in a case in which the pipe line part of the fluid pipe and the connection part between the branch part and the branch pipe are sealed, the pipe line part and the connection part between the branch part and the branch pipe are inserted through the opening. They can be cut together using a cutter.

The housing is made up of a plurality of divided bodies joined to each other, and each of the divided bodies extends in the pipe direction of the conduit section and in the branching direction of the branch part. It is said that
According to this feature, each divided body extending in the pipe direction of the pipe section of the fluid pipe and the branching direction of the branch part is joined by welding, bolt/nut joint, etc. to construct the casing. Even if the conduit portion and the branch portion are removed within the housing, the rigidity of the fluid pipe can be maintained by the housing that is fitted onto the outside in a sealed manner.

The housing is characterized in that it includes a seat portion in which the fluid control is installed in a sealed manner.
According to this feature, by installing the fluid control on the seat inside the housing, it is possible to prevent fluid from leaking between the fluid control and the housing, and the fluid control installed inside the housing prevents the fluid from leaking. can be controlled.

An attachment method for attaching the flow restriction device to the fluid pipe in a non-flow state, the method comprising:
sealingly surrounding the conduit section and the branch section of the fluid pipe with the casing;
inserting the cutter through the opening and cutting the fluid pipe between the pipe line section and the branch section;
inserting the fluid control through the opening and sealingly closing the interior of the housing;
It is characterized by having the following.
According to this feature, the pipe line part and the branch part of the fluid pipe are cut together in a sealed housing with a cutter inserted through the opening, and the cutter is cut inside the housing. By installing a fluid control device in a non-flow condition at a certain point, it is possible to simultaneously control the fluid flowing toward the pipe and the branch direction, reducing the number of temporary bypasses installed in the flow path, simplifying construction, and reducing the water cut-off range. can be narrowed.

It is a front sectional view showing the housing of the flow control device attached to the fluid pipe in an example. FIG. 3 is a top view showing the casing attached to the fluid pipe. FIG. 3 is a side view showing a cutting machine installed in an opening of a housing via a work valve. FIG. 3 is a partially enlarged side sectional view showing a cutter for cutting a fluid pipe. FIG. 3 is a top view showing the inside of the casing cut by a cutter. It is a side view which shows the installation machine installed in the opening of a housing|casing via the work valve. It is a side view which shows the fluid control installed in the housing|casing by the installation machine. It is a partial front sectional view showing the fluid control installed in the housing. FIG. 3 is a top view showing an example of construction in which a flow control device is installed to repair or replace a failed valve provided in a branch straight pipe. FIG. 7 is a partially enlarged side sectional view showing a diameter adjusting member and a fitting member in Modification 1. FIG. FIG. 7 is a top view showing a casing attached to a fluid pipe in Modification 2. FIG. FIG. 7 is a top view showing a housing attached to a fluid pipe in Modification 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments for carrying out the flow restriction device and the method for installing the flow restriction device according to the present invention will be described below based on examples.

In the embodiment, as a flow control device and a method for installing the same, a predetermined portion of an existing fluid pipe 1 constituting a conduit component is cut out within the casing 5, and a fluid control device 10 is placed in the cut portion in an uninterrupted state. The series of steps up to installation will be explained with reference to FIGS. 1 to 8. Although the fluid in the fluid pipe 1 is clean water in this embodiment, it may be, for example, industrial water, sewage, gas, or a gas-liquid mixture of gas and liquid.

The fluid pipe 1 of this embodiment is a ductile cast iron pipe, and as shown in FIGS. 1 and 2, it is an irregularly shaped pipe having a pipe section 2a and a small-diameter branch section 2b branching from the pipe section 2a. A certain T-shaped pipe 2, a pair of straight pipes 3, 3 connected to both ends of the pipe section 2a of the T-shaped pipe 2 and extending in the pipe direction, and a pair of straight pipes 3, 3 connected to the branch section 2b of the T-shaped pipe 2 and extending in the branching direction. It is composed of an extending branch straight pipe 4 (branch pipe, see FIG. 3), and is formed into a substantially circular shape in cross section. In this embodiment, the pipe direction and the branching direction of the fluid pipe 1 extend substantially horizontally, and therefore the T-shaped pipe 2 is arranged so as to form a T-shape in a plan view. The fluid pipe according to the present invention may be made of other metals such as cast iron or steel, concrete, vinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner circumferential surface of the fluid tube may be coated with an epoxy resin layer, mortar, plating, etc., or the inner circumferential surface of the fluid tube may be coated with a suitable material by powder coating.

Here, the fluid pipe of the present invention may be composed of a plurality of pipes connected to each other including at least irregularly shaped pipes as in this embodiment, or may be composed of a single pipe such as a welded product made of steel. It may also be a deformed tube. Here, an irregularly shaped pipe includes at least one of various irregularly shaped parts such as a bent pipe part, a branch part (branch pipe), a cross part (cruciform pipe), a different diameter part, a connecting ring part, a short pipe part, and a drainage part. This is a general term for the pipes in the section.

First, as shown in FIG. 1, the casing 5 constituting the flow control device is fitted onto the fluid pipe 1 in a sealed manner. The casing 5 has a multi-segmented structure, and in this embodiment, it is composed of a first segment 51 (segmented body) that constitutes the upper side and a second segmented body 52 (segmented body) that constitutes the lower side. The main body 50 mainly includes a housing body 50, and a pair of joint covers 53, 53 which are divided into two in the vertical direction. Note that the divided structure of the housing 5 is not limited to this embodiment, and may be divided horizontally, or may be divided into a predetermined number of three or more divisions, for example. Further, in this embodiment, the divided casings are joined by welding, but they are not limited to this, and may be joined by fastening members such as bolts and nuts through packing, for example.

As shown in FIG. 2, the housing main body 50 includes a pipe housing part 50a extending in the pipe direction along the pipe part 2a of the T-tube 2, and a branch part 2b of the T-tube 2. A branch housing section 50b extends in the branching direction along the branch straight pipe 4 connected to the pipe, and an opening that extends in the vertical direction and opens upward between the conduit housing section 50a and the branch housing section 50b. It is formed into a substantially T-shape in top view from a bottomed substantially cylindrical flow control housing portion 50d (see FIG. 3) having a portion 50c.

A pair of joint covers 53, 53 surrounding the connecting portions 30, 30 between both ends of the conduit section 2a of the T-shaped pipe 2 and the pair of straight pipes 3, 3 are mounted on the conduit housing section 50a, and are provided with mounting flanges 50e, 50e. are integrally joined to each other. Furthermore, a pair of first press rings 54, 54, which are divided into upper and lower halves and prevent separation, are attached in a sealed manner to the openings of the joint covers 53, 53 extending to the connecting ends of the straight pipes 3, 3. Here, the sealing position may be on the T-tube 2. Furthermore, before installing the casing 5, the connecting parts 30, 30 may be reinforced with detachment prevention metal fittings, which will be described later in Modification 2.

The branch housing part 50b extends to the connecting end of the branch straight pipe 4 connected to the branch part 2b of the T-tube 2, and the opening of the branch housing part 50b is divided into upper and lower halves to prevent separation. A press ring 55 is attached in a sealed manner. Note that the direction and number of divisions of the first press ring 54 and the second press ring 55 are not limited to those in this embodiment.

The radial center of the opening 50c of the flow control housing 50d is located on the branch 2b of the T-tube 2, and the opening 50c is located at the branch point between the pipe section 2a and the branch 2b of the T-tube 2. formed upwards. Further, the opening 50c of this embodiment is formed to include the connecting portion 40 between the branch portion 2b of the T-shaped tube 2 and the branch straight pipe 4. Further, before installing the casing 5, the connecting portion 40 may be reinforced with a detachment prevention metal fitting, which will be described later in Modification 2.

Next, as shown in FIG. 3, a working valve 6 capable of closing the opening 50c is attached to the mounting flange 50f of the flow restriction housing part 50d of the housing 5, and a cutting machine 7 is installed above the working valve 6. Install.

The cutting machine 7 includes an attachment flange tube 71, a cutter 72 for cutting the fluid pipe 1, and a drive mechanism for rotating the cutter 72 within the attachment flange tube 71 and moving the cutter 72 forward and backward in the vertical direction. It is mainly composed of 73 and. The cutter 72 includes a hole saw 72a having a circumferential cutting blade at its tip, and a center drill 72b that is disposed coaxially with the rotation axis of the hole saw 72a and protrudes further than the cutting blade. Note that the hole saw 72a of the cutter 72 is configured concentrically with the opening 50c of the flow restriction housing portion 50d of the housing 5, as shown by the chain line A in FIG. It is inserted into the flow casing 50d and can advance to a position near the bottom of the flow restriction casing 50d.

As for the specific cutting process of the fluid pipe 1 by the cutting machine 7, first, the valve body (not shown) inside the working valve 6 is evacuated to open the opening 50c of the housing 5, and then as shown in FIG. , the cutter 72 of the cutter 7 is rotated and moved downward to cut the fluid pipe 1 in a non-flow state. In this embodiment, the hole saw 72a constituting the cutter 72 cuts a part of the branch part 2b side of the pipe section 2a of the T-shaped pipe 2 constituting the fluid pipe 1 (see FIG. 2), and the entire branch part 2b. , and a part of the branch straight pipe 4 connected to the branch part 2b of the T-tube 2 on the branch part 2b side are cut at once by the advance of the hole saw 72a. At this time, it is preferable that the center drill 72b be located at a position away from the part of the connecting part 40 of the branch part 2b containing the sealant, or on the branch straight pipe 4.

Further, as shown in FIG. 5, on the inside of the opening 50c of the housing 5 in plan view, there is a substantially C-shaped cut hole in plan view on the conduit section 2a side of T-shaped tube 2 in top view, and The cut end of the branch straight pipe 4 can be seen.

In addition, a drain 56 (see FIGS. 2 and 3) that can discharge fluid to the outside is attached to the bottom of the flow control casing 50d together with a valve that can be opened and closed. The chips generated during the process can be discharged to the outside together with the fluid. This drain 56 can also be used as a bypass for filling with water during fluid control operations.

Although not shown, when the fluid pipe 1 is cut by the cutter 72, the cut piece from the fluid pipe 1 is held in the hole saw 72a. Then, the cutter 72 is pulled up together with the cut piece into the mounting flange tube 71, and the opening 50c of the housing 5 is closed by a valve body (not shown) inside the work valve 6, thereby completing the cutting operation of the fluid pipe 1. In addition, although the pipe section 2a of the T-shaped tube 2 and the branch straight pipe 4 remaining in the housing 5 after cutting off the fluid pipe 1 by the cutter 72 are separated from each other, the pipe line housing section of the housing 5 50a and the branch housing portion 50b, and are held integrally in a state surrounded by the branch housing portion 50b. Although not particularly shown in the drawings, the cutting machine 7 is removed while the opening 50c of the housing 5 is closed by a valve body (not shown) inside the work valve 6.

Next, as shown in FIG. 6, since a work valve 6 capable of closing the opening 50c is attached to the mounting flange 50f of the flow restriction housing part 50d of the housing 5, the work valve 6 is installed above the work valve 6. Machine 8 can be installed.

The installation machine 8 includes a mounting flange cylinder 81, a valve hanging fitting 82 for suspending and supporting the fluid control 10, and a drive mechanism 83 for moving and retracting the valve hanging fitting 82 in the vertical direction within the mounting flange cylinder 81. It is mainly composed of. The fluid control 10 of this embodiment is a so-called plug mainly composed of a partition wall 11 and an upper lid part 12, and the partition wall 11 has a first seal member S1 extending from the lower end to both sides. An annular second seal member S2 is attached to the upper lid portion 12 over the outer periphery. The first seal member S1 and the second seal member S2 are made of an elastic member such as rubber, elastomer, or resin including NBR, SBR, and CR.

As a specific installation process of the fluid control 10 by the installation machine 8, first, the valve body (not shown) inside the working valve 6 is evacuated and the opening 50c of the housing 5 is opened, and then as shown in FIG. , the fluid control 10 suspended by the valve hanging fitting 82 of the installation machine 8 is advanced downward, and the fluid control 10 is inserted into a predetermined position within the flow control housing portion 50d of the housing 5.

As shown in FIG. 8, a side wall stepped portion 50g, which is approximately U-shaped in top view and protrudes more inwardly than other portions of the housing 5, is provided on the side inner wall surface of the flow restriction housing portion 50d of the housing 5. 50g (seat portions) are formed to face each other. Therefore, when the fluid control 10 is inserted into the flow control housing portion 50d of the housing 5, both sides of the partition wall 11 of the fluid control 10 are guided by the side wall step portions 50g, 50g, so that the fluid control is controlled. This prevents the insertion position of the fluid 10 from shifting.

Furthermore, a bottom wall step portion 50h (seat portion) that is continuous with the side wall step portions 50g, 50g is formed on the bottom inner wall surface of the flow restriction case portion 50d of the case 5 (see FIG. 5). Therefore, when the fluid control member 10 is inserted to a predetermined depth into the flow control case portion 50d of the housing 5, the first seal member S1 is attached from the lower end of the partition wall 11 of the fluid control member 10 to both sides. is press-fitted into the bottom wall stepped portion 50h and the side wall stepped portions 50g, 50g formed in the flow control housing portion 50d, and an annular groove is attached to the outer circumference of the upper lid portion 12 of the flow control 10. 2 sealing member S2 is pressed against the side inner wall surface of the flow-restricting housing portion 50d of the housing 5 on the opening 50c side.

In this way, the fluid control 10 is installed in the flow control housing 50d of the housing 5 so as to partition between the pipe section 2a and the branch section 2b of the T-shaped pipe 2. Fluid leakage between the housing 5 and the housing 5 is prevented.

Next, a plurality of holding screws N, which are provided in the circumferential direction of the opening 50c of the housing 5 and are movable in the radial direction, are advanced in the inner diameter direction of the opening 50c (see FIGS. 2 and 8). As a result, the retaining screw N locks the upper lid portion 12 of the fluid control 10 so as to press it from above, and prevents the fluid control 10 from slipping out from the opening 50c of the housing 5.

In this way, the holding screw N presses down the upper lid part 12 of the fluid control 10 from above, so that the installation machine 8 and the work valve 6 can be removed from the housing 5.

Next, the lid member 57, which is annular in top view, is fixed to the mounting flange 50f of the flow-control housing portion 50d of the housing 5. At this time, the lid member 57 presses the upper surface of the upper lid part 12 of the fluid control 10 from above, and thus prevents the fluid control 10 from slipping out from the opening 50c of the housing 5 together with the retaining screw N. This completes the installation of the fluid control 10 into the housing 5. It goes without saying that all windows, penetrations, working holes, etc. should be sealed with lids when cutting or installing valves in a state where no flow is interrupted.

As described above, the flow control device of this embodiment is fitted onto the pipe section 2a of the T-shaped pipe 2 constituting the fluid pipe 1 and the branch section 2b branching from the pipe section 2a in a sealed manner. In the casing 5, the conduit section 2a and the branch section 2b are cut together by the hole saw 72a of the cutter 72 of the cutting machine 7 inserted from the opening 50c. By installing the fluid control 10, it is possible to simultaneously control the fluid flowing in the pipe direction of the pipe section 2a of the T-shaped pipe 2 and in the branching direction of the branch section 2b, thereby reducing the number of bypass paths temporarily installed in the flow path. This can narrow the area of water outage.

Specifically, as shown in FIG. 9, for example, a failed valve V1 is placed near a branch point of the fluid pipe 1, and an inserting valve V2 is placed upstream of the failed valve V1 in the branch straight pipe 4. Even if installation space cannot be secured, the casing 5 can be sealed and fitted around the pipe section 2a and the branch section 2b (see FIG. 2) of the T-shaped tube 2 that constitute the branch region of the fluid pipe 1. , in the casing 5, the conduit section 2a and the branch section 2b are cut together with a hole saw 72a of the cutter 72 of the cutting machine 7, and the fluid control 10 is installed at the cut location in the casing 5. This makes it possible to block the flow of fluid from the pipe section 2a of the T-shaped tube 2 to the branch section 2b while maintaining an uninterrupted state of fluid flow in the pipe direction. Therefore, in order to maintain an uninterrupted flow of fluid in the pipe direction in the pipe section 2a of the T-shaped pipe 2, as in the past, valves ( By installing one fluid control 10, there is no need to temporarily construct a bypass path that detours from the branch point to the pipe direction, and by installing one fluid control 10, the pipe direction of the pipe section 2a of the T-shaped pipe 2 and the branch section 2b can be controlled. It is possible to simultaneously control the fluid flowing in the direction of branching, simplifying construction. In addition, by newly installing the inserting valve V2 downstream of the failed valve V1 in the branch straight pipe 4, a bypass path (not shown) can be temporarily installed to maintain an uninterrupted flow state of the fluid in the branch direction, and the fluid pipe 1 The water cut-off area can be configured to be as narrow as possible. Note that the inserting valve V2 is not limited to a newly installed one, and an existing one may be used.

In addition, the cutter 72 inserted from the opening 50c of the casing 5 cuts the pipe section 2a together with the branch section 2b of the T-shaped tube 2 into a substantially C-shape, thereby reducing the cutting range of the fluid tube 1. Since it can be made smaller, various devices such as the work valve 6, cutting machine 7, and installation machine 8 for attaching the flow restriction device can be made smaller.

Further, inside the opening 50c of the housing 5, a C-shaped cut opening on the conduit section 2a side of the T-shaped tube 2 and a branch straight pipe 4 on the branched section 2b side of the T-shaped tube 2 are provided. The cutter 72 inserted through the opening 50c can be entered into the housing 5 to easily approach the pipe section 2a of the T-tube 2 and the branch straight pipe 4.

In addition, since the cutter 72 includes a hole saw 72a, by rotating the hole saw 72a, the pipe section 2a and the branch section 2b of the T-shaped tube 2 can be cut together, making cutting easy. be.

Further, the casing 5 includes a casing main body 50 that is divided into upper and lower halves that are joined to each other, and each casing main body 50 extends in the pipe direction along the pipe section 2a of the T-tube 2. The T-shaped pipe is mainly composed of a pipe casing part 50a that is connected to the branch part 2b of the T-shaped pipe 2, and a branch casing part 50b that extends in the branching direction along the branch straight pipe 4 that is connected to the branch part 2b of the T-shaped pipe 2. By constructing the casing 5 by joining the casing bodies 50 extending in the pipe direction of the pipe section 2a of the pipe 2 and the branching direction of the branch section 2b of the T-shaped tube 2 by welding or the like, this can be achieved. Even if the pipe section 2a and the branch section 2b of the T-shaped tube 2 are cut out within the housing 5, the rigidity of the fluid pipe 1 can be maintained by the housing 5 which is fitted onto the outside in a sealed manner.

In addition, the flow control housing portion 50d of the housing 5 is configured such that the flow control 10 is installed in a sealed manner with respect to the side wall step portions 50g, 50g and the bottom wall step portion 50h within the flow control case portion 50d. The fluid control 10 installed in the flow control case 50d of the case 5 prevents leakage of fluid between the flow control case 10 and the housing 5 (flow control case 50d), and performs initial flow path control. It can be performed.

Further, in the above embodiment, the cutter 72 of the cutter 7 is moved downward while rotating to directly cut out the fluid pipe 1. However, as a first modification of the present invention, as shown in FIG. Inside the body 5, above the branch straight pipe 4, there is a diameter adjusting member 100 (adjustment section) may be provided. In this case, by moving the cutter 72 of the cutting machine 7 downward while rotating, the outer peripheral surface of the pipe section 2a of the T-shaped pipe 2 with a large diameter and the upper end of the outer peripheral surface of the branch straight pipe 4 with a small diameter are cut. In other words, the hole saw 72a of the cutter 72 comes into contact with the upper surface of the diameter adjusting member 100 (adjusting section) provided at the top surface of the diameter adjusting member 100 (adjusting section) at the same time. There is no uneven contact, and the resistance to the hole saw 72a during cutting acts almost uniformly, suppressing the inclination of the cutter 72. can be easily cut together by the cutter 72. In addition, the material of the diameter adjustment member 100 (adjustment part) should be selected from a material having the same rigidity as the pipe section 2a of the T-shaped pipe 2 and the branch straight pipe 4 to be cut, such as cast iron or steel. is preferable, and by doing so, the cutting resistance applied to the conduit section 2a, the branched straight pipe 4, and the diameter adjustment member 100 (adjustment section) by the cutting machine 7 can be equalized, making cutting even easier.

Further, a cylindrical insertion member 101 (insertion part) into which the center drill 72b of the cutter 72 is inserted is provided on the outer circumferential surface of the branch part 2b of the T-shaped tube 2, so that the inside of the insertion member 101 can be inserted into the insertion member 101. By inserting the center drill 72b, the rotation axis of the hole saw 72a, which is disposed coaxially with the center drill 72b, can be positioned, so that They can be resected together without misalignment. Note that the diameter adjustment member 100 and the insertion member 101 may be fixed to the fluid pipe 1 (T-shaped pipe 2 and branch straight pipe 4) by welding, a band, or the like. Furthermore, the installation positions, dimensions, shapes, etc. of the diameter adjusting member 100 and the insertion member 101 may be freely configured depending on the fluid pipe 1 in which the fluid control member 10 is installed. Alternatively, only either the diameter adjustment member 100 or the insertion member 101 may be installed.

Further, in the embodiment described above, the radial center of the flow control housing portion 50d of the housing 5 is located on the branch portion 2b of the T-tube 2, and the opening portion 50c is located on the conduit portion 2a of the T-tube 2. The cutter 72 connects a part of the pipe section 2a and the entire branch section 2b of the T-shaped tube 2 constituting the fluid pipe 1 to the branch section 2b of the T-shaped tube 2. 11, as a second modification of the present invention, the flow control housing portion 150d of the housing 105 has a radial center that is The cutter 72 is located above the pipe section 2a of the T-tube 2, and the opening 150c is formed so as to straddle the pipe section 2a and the branch section 2b of the T-tube 2. It may be configured such that part of the pipe section 2a and branch section 2b of the T-shaped tube 2 are removed together. Particularly in this case, by installing the above-mentioned detachment prevention fittings on the connecting parts 30, 30 and 40 before installing the casing 5, movement of the conduit part 2a at the time of cutting is prevented, and It is preferable to fix the remaining members of the T-tube 2 after cutting. To explain in detail, the connecting parts 30, 30 and the connecting part 40 are provided with seals using push rings to seal these connecting parts. Here, the dotted line in FIG. 11 has a main body divided in the circumferential direction, and has a locking member (not shown) built into the main body that bites into and locks the straight pipe 3, the branched straight pipe 4, or the outer circumferential surface of the conduit section 2a. The detachment prevention metal fitting is installed by replacing the bolts and nuts that connect the push ring and the socket one by one, connecting the detachment prevention push ring shown by the push ring through the detachment prevention push ring, and inserting the locking member into the detachment prevention push ring. . Moreover, the detachment prevention metal fitting may have a locking member in a main body divided in the circumferential direction, and may be a metal fitting that straddles the press ring and fits into the socket.

Further, in the above embodiment, a part of the T-shaped pipe 2 that forms a branch area by the pipe section 2a and the branch section 2b is mainly cut out, but as a third modification of the present invention, FIG. As shown, the flow control housing part 250d of the housing 205 is located on the straight pipe 3 connected to the joint ring 202, and the opening 250c straddles the connecting part 230 between the joint ring 202 and the straight pipe 3. As shown by the chain line C, the cutter 72 connects the connecting portion 230 together with a branching area formed by a drain or bypass (not shown) provided on the bottom side of the connecting ring 202 or the straight pipe 3. It may be configured to be resected. Note that the fluid pipe cut by the cutter 72 may not have a drain, bypass, or the like.

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

For example, in the embodiment, a plug is used as the fluid control 10, but the present invention is not limited to this as long as the fluid in the fluid pipe 1 is controlled. For example, the fluid control may be a gate valve, It may be a butterfly valve, a switching valve, or the like.

In addition, in the above embodiment, the branch portion 2b of the T-shaped tube 2 constituting the fluid tube 1 is configured to have a smaller diameter than the tube portion 2a, but the tube portion and the branch portion of the T-shaped tube are They may have approximately the same diameter.

Further, the fluid pipe 1 to be cut by the cutter 72 is not limited to a T-shaped pipe, but may be another irregularly shaped pipe such as a bent pipe, a reducer, or a cross pipe.

1 Fluid pipe 2 T-shaped pipe 2a Pipe line section 2b Branch section 3 Straight pipe 4 Branch straight pipe (branch pipe)
5 Housing 6 Work valve 7 Cutting machine 8 Installation machine 10 Fluid control 11 Partition wall 12 Upper cover 50 Housing body 50a Pipe housing 50b Branch housing 50c Opening 50d Flow control housing 50f Mounting flange 50g Side wall Stepped section (seat section)
50h Bottom wall step (seat)
51 First divided body (divided body)
52 Second divided body (divided body)
57 Lid member 71 Mounting flange tube 72 Cutter 72a Hole saw 72b Center drill 73 Drive mechanism 81 Mounting flange tube 82 Valve hanging fitting 83 Drive mechanism 100 Diameter adjustment member 101 Fitting member 105 Housing 150c Opening 150d Flow control housing portion 202 Joint Ring 205 Housing 230 Connection section 250c Opening section 250d Flow control housing section

Claims (2)

A method for cutting a fluid pipe in which a part of the fluid pipe is cut in a non-flow state, the method comprising:
A casing formed in a substantially T-shape at least in plan view, and detachment preventive devices attached to the openings of the casing , allow the pipe line portion of the fluid pipe and the branch portion branching from the pipe line portion to be connected to the a step of sealingly enclosing in a state that prevents separation from the conduit portion and prevents separation from the branch portion;
a step of cutting the fluid pipe by a cutter attached to the case inside the casing , and the detachment prevention tool cuts at least the duct part or the branch part of the fluid pipe. A locking member that bites into and locks the outer peripheral surface of a straight pipe connected to the conduit section, a main body that incorporates the locking member, and a body that bites into and locks the outer peripheral surface of the branched straight pipe connected to the branch section. 1. A method for cutting a fluid pipe , comprising: a locking member for locking; and a main body housing the locking member . The fluid pipe according to claim 1 , wherein the detachment prevention device further includes a seal for sealing the pipe section or the straight pipe , and a seal for sealing the branch straight pipe. Excision method.

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