JP2022101263A - Connection method for branch pipe using work valve, and work valve used therefor - Google Patents

Abstract

To provide a connection method for a branch pipe using a work valve capable of easily performing a valve opening operation on a valve body, and the work valve used therefor.SOLUTION: The present invention relates to a connection method for a branch pipe 10 using a work valve 3 comprising a housing 5 to which a fluid pipe 1 is externally fitted in a sealed state, and a valve body 31 capable of blocking or opening a branch part 5d in the housing 5 in the sealed state. The connection method includes: a hole forming step of boring or cutting the fluid pipe 1 in the housing 5 in an open state of the valve body 31; a connection step of connecting the branch pipe 10 to the branch part 5d of the housing 5 in a block state of the valve body 31; a pressure regulating step of reducing a differential pressure between the side of the fluid pipe 1 and the side of the branch pipe 10, holding the valve body 31 in the block state therebetween, in the housing 5; and a valve opening step of opening the valve body 31.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for connecting a branch pipe using a work valve at a branch portion of the fluid pipe and a work valve used thereof.

For the fluid pipe that constitutes the existing pipeline through which water, gas, etc. flow, for example, in the construction of forming a new branch path in the existing fluid pipe, a work valve is used without stopping the flow of the fluid in the fluid pipe. A continuous flow method for connecting branch pipes is generally used.

For example, the work valve used for connecting the branch pipe of Patent Document 1 includes a housing that is hermetically attached to the outer peripheral surface of the fluid pipe, a case that is hermetically connected to the branch portion of the housing, and the inside of the case. It is equipped with a valve body that is pre-contained in the housing and can move forward and backward toward the branch portion of the housing. Further, a part of the fluid pipe can be drilled or cut by operating a cutting tool inserted in the pipe axis direction from the opening of the branch portion of the housing from the outside. In this work valve, after forming a hole in the fluid pipe, the valve body is advanced toward the branch portion of the housing by screw operation, so that the seal portion of the valve body becomes the inner peripheral surface of the branch portion of the housing. It is pressed and can block the fluid flowing from the fluid pipe into the branch of the housing.

International Publication No. 2019/188778 (pages 11-12, Fig. 9)

In the branch pipe connection of Patent Document 1, the existing fluid pipe is connected by drilling the fluid pipe in the housing and then connecting the branch pipe in a state where the fluid in the branch portion of the housing is blocked by the work valve. The work of connecting the branch pipe to the can be easily performed. However, in the housing, there is a fluid in the pipe with a predetermined pressure on the side of the existing fluid pipe that sandwiches the valve body of the work valve, while on the side of the branch pipe, the opening of the branch pipe is closed by the butterfly valve to form a seal. Air at a lower pressure than the fluid in the pipe exists in the space. Therefore, when the valve body of the work valve is opened, the fluid in the fluid tube side in the housing that sandwiches the valve body flows into the sealed space on the branch pipe side, but the valve body at the time of closing and immediately after the valve opening is Since it is in a state of being pressed toward the branch pipe side by the fluid pressure in the fluid pipe, the inner peripheral surface of the branch portion of the housing and the seal portion of the valve body in contact with the inner peripheral surface of the branch portion are excessively separated. There was a risk that the valve body would be difficult to open due to the pressure contact and the frictional force. In particular, in the case of a large diameter or a high pressure of 0.75 MPa or more, there is a possibility that the valve opening operation of the valve body of the working valve becomes remarkably difficult.

The present invention has been made by paying attention to such a problem, and provides a method of connecting a branch pipe using a working valve capable of easily opening a valve body, and a working valve used thereof. With the goal.

In order to solve the above-mentioned problems, the method of connecting a branch pipe using the working valve of the present invention can be used.
A method for connecting a branch pipe using a working valve including a housing in which the fluid pipe is fitted in a sealed state and a valve body in which the branch portion in the housing can be closed or opened in a sealed manner.
A hole forming step for drilling or cutting the fluid pipe in the housing in the open state of the valve body, and a connection step for connecting the branch pipe to the branch portion of the housing in the closed state of the valve body. It is characterized by having a pressure adjusting step for reducing the differential pressure between the fluid pipe side and the branch pipe side in the housing sandwiching the valve body in the shut-off state, and a valve opening step for opening the valve body. There is.
According to this feature, in order to open the valve body in a state where the differential pressure between the fluid pipe side and the branch pipe side in the housing sandwiching the valve body is small, the valve body opens the valve body by the pressure of the fluid flowing through the fluid pipe. Excessive pressure contact with the inner peripheral surface is avoided, and the valve body can be easily opened.

The pressure adjusting step is characterized in that the branch pipe is filled with the same fluid as the fluid on the fluid pipe side while discharging the air in the sealed space formed on the branch pipe side sandwiching the valve body.
According to this feature, since the air in the branch pipe, which is a sealed space, is replaced with the fluid, the fluid in the pipe can be branched without leaving air in the branch pipe.

The pressure adjusting step is characterized in that the branch pipe is filled with the fluid on the fluid pipe side that sandwiches the valve body.
According to this feature, since the same fluid in the fluid pipe is filled in the branch portion of the housing sandwiching the valve body and the branch pipe, it is easy to adjust the pressure in the branch portion and the branch pipe of the housing sandwiching the valve body to the same pressure. ..

In the connection step, the branch pipe is fitted into the branch portion of the housing in the closed state of the valve body, and after the valve opening step, the branch pipe in the branch portion is fitted to the valve body. It is characterized by having a second step of pulling the fluid pipe side from the valve seat portion of the above.
According to this feature, by making the final connection of the branch pipe to the branch portion of the housing in the second step, the insertion portion of the valve body can be closed from the inside by the branch pipe, so that the structure of the working valve can be closed. Can be simplified, and the work valve can be attached and detached.

The connection step is characterized in that the branch pipe movably supported in the pipe axial direction is internally fitted in a state where the axial center of the branch portion of the housing is fixedly supported so as to extend in a substantially horizontal direction. ..
According to this feature, the branch pipe can be stably connected to the branch portion of the housing.

The pressure adjusting step is characterized in that, before the second step, the fluid in the fluid pipe is filled in the surrounding member that surrounds the branch pipe in a sealed manner.
According to this feature, by reducing the differential pressure inside and outside the branch of the housing, the resistance of the fluid generated when the branch pipe is drawn into the branch of the housing can be reduced, so that it is small. It can be pulled in by force.

The working valve of the present invention is
It is a work valve used for connecting branch pipes, including a housing that is externally fitted to the fluid pipe in a sealed state and a valve body that can shut off or open the fluid at the branch portion in the housing in a sealed manner. ,
The valve body is provided with a communication hole penetrating the valve body.
The valve body is characterized by having a switching means for switching the communication hole into a communication state or a non-communication state.
According to this feature, when the valve body is closed, the communication hole can be closed by the switching means to shut off the fluid in the fluid pipe, and the communication hole can be set to the communication state by the switching means. Since the differential pressure on both sides of the branch portion of the housing that sandwiches the valve body in the pipe axis direction can be reduced, the valve body can be easily opened.

The valve body has a sealing member at the end on the branch pipe side, and is characterized by being movable along a groove as a valve seat portion formed in the circumferential direction inside the branch portion of the housing. It is supposed to be.
According to this feature, when the valve body is closed, the seal member is pressed against the inner peripheral surface of the groove by using the differential pressure on both sides in the pipe axial direction of the branch portion of the housing sandwiching the valve body to maintain the closed state. Can be done. Further, when the valve body is opened, the communication hole is set in a communication state in advance by the switching means, and the differential pressure on both sides in the pipe axial direction of the branch portion of the housing sandwiching the valve body is reduced, so that the seal accompanying the movement of the valve body is sealed. It is possible to prevent wear and damage of members.

(A) is a partial cross-sectional side view showing a housing in which a fluid pipe constituting an existing pipeline in Example 1 of the present invention is fitted, and (b) is a partial cross-sectional plan view also seen from below. .. It is a partial cross-sectional side view which shows the situation which the fluid pipe is pierced by the piercing machine in Example 1. FIG. FIG. 2 is a partial cross-sectional front view showing a situation in which chips are discharged by a discharger in the cross section AA of FIG. 2. It is a partial cross-sectional side view which shows the working valve in a closed state. (A) is a partial cross-sectional side view showing a situation in which the first step of the connection step and the pressure adjusting step are performed from the situation of FIG. 4, and (b) is a partial cross-sectional front view showing the BB cross section of (a). Is. It is a partial cross-sectional side view which shows the situation which performed the valve opening step from the situation of FIG. It is a schematic diagram which shows an example of the 2nd step of the connection step using a hydraulic piston. It is a partial cross-sectional side view which shows the situation which performed the 2nd step of the connection step from the situation of FIG. It is a partial cross-sectional side view which shows the modification 1 of this invention. It is a partial cross-sectional side view which shows the modification 2 of this invention. (A) is a partial cross-sectional side view showing a situation in which the fluid in the fluid pipe is filled in the work case as a pressure adjustment step before the second step of the connection step in the second embodiment of the present invention, and (b) is (a). It is a partial cross-sectional front view which shows the CC cross section of). It is a partial cross-sectional side view which shows the situation which the fluid pipe is pierced by the piercing machine in Example 3 of this invention. It is a partial cross-sectional side view showing a situation where the fluid in the fluid pipe is filled in the branch pipe and the work case as a pressure adjustment step before the second step of the connection step in the third embodiment. It is a partial cross-sectional side view which shows the situation which performed the 2nd step of the connection step from the situation of FIG.

A method of connecting a branch pipe using the working valve according to the present invention and a mode for carrying out the working valve used therefor will be described below based on examples.

The method of connecting the branch pipe using the working valve according to the first embodiment and the working valve used therefor will be described with reference to FIGS. 1 to 8.

The work valve 3 of the present embodiment is used, for example, for a work of connecting a branch pipe 10 branching from the fluid pipe 1 in an uninterrupted state to any position of the fluid pipe 1 constituting the existing pipe. It is a thing.

The fluid in the fluid pipe 1 is clean water in this embodiment, but may be, for example, industrial water, agricultural water, sewage, or a liquid other than water, or a gas or a gas-gas-liquid gas-liquid. It may be a mixture. Further, the working valve 3 of this embodiment is not limited to being used when connecting the branch pipe 10 in a direction different from that of the fluid pipe 1, and may be used in a valve device for controlling the flow of fluid in the fluid pipe 1. good.

The fluid pipe 1 of this embodiment is a ductile cast iron pipe having a relatively large diameter (for example, a diameter of 200 mm or more), and is formed as a straight pipe having a substantially circular cross-sectional view as shown in FIG. In this embodiment, the pipeline direction of the fluid pipe 1 is arranged in a substantially horizontal direction. 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 may be coated with an epoxy resin layer, mortar, plating, or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid tube by powder coating. Further, the pipeline direction may be arranged substantially vertically or diagonally.

Here, the fluid pipe of the present invention is not limited to a straight pipe as in the present embodiment, and may be formed of, for example, a deformed pipe. Here, the deformed pipe is a general term for a pipe having various deformed parts such as a curved pipe part, a branch part, a cross part, a different diameter part, a joint ring part, a short pipe part, and a drainage part. Is.

Next, the structure of the work valve 3 and its installation will be described.

First, as shown in FIGS. 1 (a) and 1 (b), after cleaning the outer surface of the fluid pipe 1 which is the mounting location of the work valve 3 according to the present invention, the perforated portion of the fluid pipe 1 to be described later is sealed. The housing 5 constituting the work valve 3 is externally fitted in a hermetically sealed manner via a sealing member for sealing. The housing 5 has a divided structure composed of a plurality of divided bodies. In this embodiment, the first divided body 51 which constitutes one side portion and is provided with the neck portion 5d as a branched portion, and the other side portion are configured. It is mainly composed of the second divided body 52. The divided structure of the housing 5 is not limited to this embodiment, and may be divided in the vertical direction, for example, and the number of divisions may be divided into a predetermined number of 3 or more. Further, in this embodiment, the divided bodies are joined in a sealed state by a fastening member 6 made of bolts and nuts, but the present invention is not limited to this, and for example, welding may be used. Further, the housing 5 describes an embodiment in which the work valve body 31 that slides in the vertical direction is applied as the valve body of the work valve 3, but the present invention is not limited to this, and the valve body is applied in the left-right direction or the diagonal direction. You may do it.

The first divided body 51 of the housing 5 has a pipeline housing portion 5a extending in the pipeline direction along the fluid pipe 1 and a horizontal direction at substantially the center of the pipeline housing portion 5a, that is, an actual site. It is composed of an open end portion 5c that branches in the horizontal direction instead of the vertical direction and opens in the branch direction, and a tubular neck portion 5d that has an opening portion 5b that opens upward. It is formed in a shape. The housing 5 is fixedly supported by a jack J or the like so that the axis of the neck portion 5d extends in the horizontal direction. Further, the branching direction is not limited to the horizontal direction, and may be, for example, a vertical direction or an oblique direction.

Further, the end portion of the neck portion 5d on the open end portion 5c side has an annular flange portion 5e protruding in the outer diameter direction of the neck portion 5d.

Although not shown for convenience of explanation, the opening 5b that opens above the neck portion 5d is opened in a substantially rectangular shape that is horizontally long in a plan view, and the work valve body 31 of the work valve 3 is inserted as described later. It is formed as possible.

Further, a communication opening 17 that penetrates the neck 5d in and out is formed at the lower portion of the neck 5d, and an opening / closing plug 18 is screwed into the communication opening 17.

Further, as shown in FIG. 1, the inner peripheral portion of the neck portion 5d has an inner peripheral surface 5f formed on a substantially circular curved surface in the front view and linearly in the horizontal direction, and an opening portion 5b in the axial direction of the neck portion 5d. At the same position, the recessed portion 5g, which is a groove as a valve seat portion recessed in the outer diameter direction from the inner peripheral surface 5f along the circumferential direction, and the base end of the neck portion 5d rather than the recessed portion 5g. The inner peripheral surface 5h formed on the side and slightly smaller in diameter than the inner peripheral surface 5f on the distal end side of the neck portion 5d, and the inner peripheral surface 5h connected to the distal end side and the proximal end side of the inner peripheral surface 5f in the radial direction. It is provided with a step portion 5i formed in a straight line.

Next, as shown in FIG. 2, the working valve 3 is hermetically connected to the opening 5b of the neck portion 5d. The work valve 3 includes a housing 5, a work valve body 31 that slides inside the housing 5 so as to be openable and closable, an accommodation internal 32a that accommodates the work valve body 31 so as to be slidable in the vertical direction, and one end below the housing valve body 31. It is mainly composed of a housing member 32 having an open opening portion 32b.

The accommodating member 32 is pivotally supported so as to be rotatable and immovably unable to move forward and backward, and includes a shaft member 34 extending in the vertical direction, and a working valve body 31 is screwed into the shaft member 34. The working valve body 31 is configured to be slidable with respect to the accommodating member 32 by rotating the operating member 35 attached to the end of the shaft member 34 protruding outward.

Further, the working valve body 31 is equipped with a ring-shaped seal member 31a on the side surface of the branch pipe 10 side, that is, the side surface of the neck portion 5d facing the open end portion 5c side, and the working valve body 31 is provided with the pressure of the fluid in the pipe of the fluid pipe 1. 31 is pressed toward the branch pipe 10, and the sealing member 31a comes into surface contact with the side wall 5j of the recessed portion 5g, so that the inside of the housing 5 can be closed in a sealed manner (see FIG. 4).

Next, as shown in FIG. 2, the drilling machine 7 is hermetically connected to the open end portion 5c of the neck portion 5d. The drilling machine 7 horizontally advances and retracts the mounting flange cylinder 71, the cutter 72 for drilling the fluid pipe 1, the drive motor 74 for rotating the cutter 72 in the mounting flange cylinder 71, and the cutter 72. It is mainly composed of an advancing / retreating mechanism 73 for making the engine move. The drilling machine 7 is supported by a jack J or the like so that the axial centers of the mounting flange cylinder 71 and the advancing / retreating mechanism 73 extend in the horizontal direction. The cutter 72 is formed into a bottomed cylinder having a diameter smaller than that of the fluid tube 1, and has a hole saw 72a having a cutting blade at its tip along the circumferential direction and a cutting blade arranged coaxially with the rotation axis of the hole saw 72a. It is composed of a center drill 72b that protrudes toward the front. The cutter 72 is arranged concentrically with the open end portion 5c of the neck portion 5d of the housing 5, is inserted into the neck portion 5d of the housing 5 from the open end portion 5c side, and at least the pipe wall of the fluid pipe 1 is formed. It is possible to proceed to the position where it penetrates.

Further, the hole saw 72a is composed of a large number of hair-like members 91, 91, ... A sweep-out portion 90 is provided over the entire circumference. The sweeping portion 90 is configured to enter the inside of the recessed portion 5g or advance from the inside of the recessed portion 5g as the hole saw 72a moves forward and backward. Further, the sweeping portion 90 may be on the entire outer peripheral surface of the hole saw 72a, or may be partially provided.

Further, the hair-like member 91 constituting the sweep-out portion 90 is made of a material such as metal, resin, or fiber, and contaminants such as chips in the recessed portion 5 g can be removed like a broom or a brush. It has a function to sweep out to the outside.

Further, as shown in FIG. 2, the sweeping portion 90 is at a position where the cutting blade at the axial tip of the hole saw 72a inserted into the neck portion 5d by the advancing / retreating mechanism 73 is in contact with the outer surface of the fluid pipe 1 and is drilled. It is in a state of being inserted into the recessed portion 5 g. By doing so, it is possible to prevent foreign matter such as chips from entering the recessed portion 5 g.

Further, when the hole saw 72a rotates when the cutter 72 is drilled, the sweep-out portion 90 inserted in the recessed portion 5g rotates in the circumferential direction to increase the fluidity in the recessed portion 5g and cut. Foreign matter such as powder can prevent entry.

Next, the mounting procedure of the drilling machine 7 will be described. The flange portion 75 formed at the tip of the mounting flange cylinder 71 is attached to the flange portion 5e of the open end portion 5c of the neck portion 5d by a plurality of fastening members 77 in the circumferential direction. To conclude.

Further, a sealing member is provided between the side end surface of the flange portion 5e of the neck portion 5d and the side end surface of the flange portion 75 of the mounting flange cylinder 71, and this sealing member is in close contact with the flange portion 75 of the mounting flange cylinder 71. By doing so, the mounting flange cylinder 71 of the drilling machine 7 and the neck portion 5d of the housing 5 are sealed in this fastened state.

The connection work of the work valve 3 to the opening 5b of the neck 5d and the connection work of the punch 7 to the open end 5c of the neck 5d are not necessarily limited to the above-mentioned order, and the connection work of the punch 7 is performed. After that, the connection work of the work valve 3 may be performed, or these connection operations may be performed in parallel.

Next, the step of forming the hole portion of the fluid pipe 1 by the drilling machine 7 will be described. First, in a state where the working valve body 31 of the working valve 3 is arranged in the accommodating inner portion 32a of the accommodating member 32 and the inside of the housing 5 is opened, the inside of the housing 5 is opened. The cutter 72 is rotated by the drive motor 74 of the drilling machine 7, and the cutter 72 is advanced in the horizontal direction by the advancing / retreating mechanism 73, and the pipe wall on the pipe side of the fluid pipe 1 is formed into a hole by drilling in a continuous flow state. The hole formation may be performed by drilling a pipe wall with a cutter 72 having a diameter smaller than that of the fluid pipe 1 as in the present embodiment, or a pipe shaft having a cutter having a diameter larger than that of the fluid pipe 1. It may cut or divide a part of the direction.

At this time, particularly in the horizontal branch as in the present embodiment, a part of the chips of the fluid pipe 1 generated at the time of drilling tries to enter the neck portion 5d, but communicates with the inside of the housing 5, for example. By opening the ball valve attached to the communication opening 17 formed at the lower part of the neck portion 5d as the opening, the chips generated at the time of drilling are discharged to the outside together with the fluid. As will be described later, the communication opening 17 is used as a bypass for filling water during the pressure adjustment step. Further, the above-mentioned ball valve is later removed in a continuous flow state and sealed with an open / close plug 18.

Further, as shown in FIG. 4, when the fluid tube 1 is cut by the cutter 72, the section 1d separated from the fluid tube 1 is held in the hole saw 72a. Then, when the cutter 72 is pulled into the inside of the mounting flange cylinder 71 together with the section 1d, the sweeping portion 90 operates so as to sweep outward from the inside of the recessed portion 5g. By doing so, even if foreign matter such as chips enters the recessed portion 5g, the foreign matter can be discharged to the outside of the recessed portion 5g.

Further, as shown in FIG. 3, a pair of small-diameter communication openings 5k and 5k that penetrate the neck 5d in and out are formed on both sides of the neck 5d, and the communication openings 5k and 5k are perforated. Dischargeers 8 and 8'for discharging the chips generated at the time are connected, respectively. Since the ejectors 8 and 8'have the same structure, the description of the ejector 8'will be omitted.

In the discharger 8, a suction pipe 80 made of a rod-shaped body having a small diameter for discharging chips is inserted into the communication opening 5k in a sealed state, and the tip opening 81a arranged inside the neck portion 5d is a recessed portion 5g. It is designed to be placed in the deepest part of the inside. In the suction tube 80, the tip opening 81a may be appropriately swung and moved back and forth along the recessed portion 5g by forming the portion arranged inside the neck portion 5d with a rubber flexible tube or the like. ..

The suction pipe 80 has an inner space structure in which the tip opening 81a arranged inside the neck 5d and the rear end opening 81b arranged outside communicate with each other, and is arranged outside the housing 5. The valve 82 screwed into the communication opening 5k allows the suction pipes 80 to open and close both openings 81a and 81b, that is, the communication passage that communicates inside and outside the neck 5d.

Further, during the cutting of the fluid pipe 1 by the cutter 72, or after the fluid pipe 1 is cut and the cutter 72 is pulled into the inside of the mounting flange cylinder 71 together with the section 1d, the valve 82 is opened to open the neck portion 5d. Chips in the recessed portion 5g are sucked from the tip opening 81a of the suction pipe 80 together with the fluid inside, and discharged to the outside of the housing 5 from the rear end opening 81b. Then, by closing the inside of the housing 5 with the work valve body 31 of the work valve 3, the drilling work of the fluid pipe 1 is completed (see FIG. 4).

By doing so, the suction pipe 80 that communicates with the inside and outside of the housing 5 allows all foreign substances such as chips in the housing 5 to be discharged to the outside. The number of suction tubes 80 is not limited to two, and a predetermined number may be provided. Further, the suction pipe 80 may be removed, for example, during cutting of the fluid pipe 1, and attached to the valve 82 after the cutting is completed so that foreign matter such as chips is discharged to the outside. It is preferable to remove the suction pipe 80 in succession after this, but the present invention is not limited to this, and the valve 82 and the rear end opening are not limited to this, and when the work valve body 31 is closed in a sealed manner during the removal work of the drilling machine 7. Foreign matter such as chips may be pushed out by the working valve body 31 while opening the valve of 81b. The suction pipe 80 can be removed before the inside of the housing 5 is closed by the work valve body 31 of the work valve 3.

As shown in FIG. 4, the seal member provided in the working valve body 31 by using the pressure of the fluid in the pipe of the fluid pipe 1 by closing the inside of the housing 5 by the working valve body 31 of the working valve 3. Since the 31a can be brought into surface contact with the side wall 5j of the recessed portion 5g formed in the inner peripheral portion of the neck portion 5d of the housing 5, the sealing performance can be improved. Further, by bringing the peripheral edge portion of the working valve body 31 into surface contact along the recessed portion 5g, the working valve body 31 can be formed into a thin plate shape, so that the extension of the housing 5 in the branching direction, that is, the stroke of the drilling machine 7 is performed. Can be shortened, and the drilling accuracy can be improved without eccentricity of the punching machine 7. Further, by making the working valve body 31 into a thin plate, it is possible to achieve cost reduction by downsizing the working valve body 31 and the housing 5. Note that FIG. 4 shows a state in which the fluid in the pipe flowing into the drilling machine 7 side is drained after the working valve body 31 is closed.

Next, with the inside of the housing 5 closed by the work valve body 31 of the work valve 3, the punching machine 7 is removed, and as shown in FIG. 5A, the neck portion is replaced with the punching machine 7. The branch pipe 10 is connected to the open end portion 5c of 5d. The branch pipe 10 is mainly composed of a short pipe 11 fitted inside the open end portion 5c of the neck portion 5d and a butterfly valve 12 fitted outside at the end portion of the short pipe 11 in the branching direction. The branch pipe 10 is supported by a jack J or the like so that the axis extends in the horizontal direction and is movable in the pipe axis direction. Further, the branch pipe 10 of the present embodiment is easily moved in the pipe axial direction by supporting the butterfly valve 12 on a plurality of rollers R provided on the jack J.

Here, in the branch pipe according to the present invention, a sealed space is formed inside. In the branch pipe 10 of this embodiment, the short pipe 11 and the butterfly valve 12 are hermetically connected to the housing 5, and the closing lid 13 is hermetically attached to one open end portion 12g of the butterfly valve 12. A sealed space is formed in the branch pipe 10. Air is present in the sealed space inside the branch pipe 10.

More specifically, the short pipe 11 of the present embodiment is a ductile cast iron pipe having a relatively large diameter (for example, a diameter of 200 mm or more) like the fluid pipe 1, and as shown in FIG. 5A, the cross-sectional view is omitted. It is formed in a straight pipe with a circular flange. In this embodiment, the pipeline direction of the short pipe 11 is arranged in a substantially horizontal direction. The short 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 short tube may be coated with an epoxy resin layer, mortar, plating or the like, or an appropriate material may be coated on the inner peripheral surface of the short tube by powder coating.

The butterfly valve 12 has a housing 12a in which a cylindrical portion 12d with a flange is projected upward, an operation shaft 12b that is inserted and held in the housing 12a in the vertical direction, and an operation shaft 12b that is integrally fixed to the operation shaft 12b and is inside the housing 12a. Mainly from a butterfly valve body 12c that can be opened and closed, and an operating device 12e that is connected to the flanged tubular portion 12d of the housing 12a and can rotate the operation shaft 12b and the butterfly valve body 12c from the outside of the housing 12a. It is configured in. As long as the inside of the branch pipe 10 can be opened and closed, the valve is not necessarily limited to the butterfly valve 12, and may be an on-off valve such as a ball valve or a sluice valve.

Next, the first step of the connection step of the branch pipe 10 will be described. First, as shown in FIG. 5A, it is formed at the open end 5c of the housing 5 and at one end of the short pipe 11. The insertion portion 11a is internally fitted, and the flange portion 11b of the short pipe 11 is fastened to the flange portion 5e of the open end portion 5c of the neck portion 5d by a plurality of fastening members 16 in the circumferential direction.

Further, a ring-shaped sealing member 14 is provided between the inner peripheral surface 5f in the inner peripheral portion of the neck portion 5d and the outer peripheral surface of the insertion portion 11a of the short tube 11, and the sealing member 14 is inside the neck portion 5d. By being in close contact with the peripheral surface 5f, the short tube 11 and the neck portion 5d of the housing 5 are sealed in this fastened state.

Next, the other open end portion 12f of the butterfly valve 12 is externally fitted to the insertion portion 11c formed at the other tip portion of the short tube 11, and the push ring 21 extrapolated to the insertion portion 11c of the short tube 11 is inserted. , The butterfly valve 12 is fastened to the flange portion 12h of the housing 12a by a plurality of fastening members 22 in the circumferential direction.

Further, a ring-shaped sealing member is provided between the inner peripheral surface of the other open end portion 12f of the butterfly valve 12 and the outer peripheral surface of the insertion portion 11c of the short tube 11, and the sealing member is the short tube 11 The short tube 11 and the butterfly valve 12 are sealed in this fastened state by being in close contact with the outer peripheral surface of the insertion portion 11c. The joining of the short pipe 11 and the butterfly valve 12 is not limited to the NS joining as described above, and may be, for example, a flange joining, a mechanical joining, a K-shaped joining, or the like. Further, the work of connecting the short pipe 11 to the open end portion 5c of the housing 5 and the work of joining the butterfly valve 12 to the short pipe 11 are not necessarily limited to the above-mentioned order, and the work of joining the butterfly valve 12 to the short pipe 11 is not necessarily limited. After that, the short pipe 11 may be connected to the open end portion 5c of the housing 5.

Further, as shown in FIGS. 5A and 5B, a pair of rotation stoppers 11d protruding in the outer diameter direction from the insertion portion 11c side of the flange portion 11b are provided on the outer peripheral surface of the short tube 11. By arranging the bolt 19 screwed to the rotation stopper 11d so as to be in contact with a part of the push ring 21 in the circumferential direction, the relative rotation of the short tube 11 with respect to the housing 5 and the butterfly valve 12 is prevented. To.

Next, the pressure adjusting step will be described. First, as shown in FIG. 5A, the working valve body is in a state where the branch pipe 10 is hermetically connected to the open end portion 5c of the housing 5 as described above. Prior to opening 31, the communication opening 17 provided in the neck portion 5d of the housing 5 and the fluid injection port 13a provided in the closing lid 13 of the butterfly valve 12 constituting the branch pipe 10 so as to be openable and closable. Is communicated with the connecting hose 20. By doing so, the fluid in the fluid pipe 1 is gradually introduced into the branch pipe 10 through the communication opening 17, the connecting hose 20 and the fluid injection port 13a by the fluid pressure. It is preferable that the fluid injection port 13a is provided with a pressure gauge capable of measuring the pressure in the branch pipe 10.

By introducing the fluid in the fluid pipe 1 into the branch pipe 10 and filling the branch pipe 10 in this way, the inside of the branch pipe 10 and the inside of the fluid pipe 1 are connected before the working valve body 31 is opened. It can be adjusted to approximately the same pressure. Here, the pressure adjustment means not only adjusting the inside of the branch pipe 10 and the inside of the fluid pipe 1 to substantially the same pressure, but also adjusting so as to reduce the differential pressure. In the pressure adjustment step, a differential pressure may be generated between the branch pipe 10 and the fluid pipe 1, but it is preferably 1.5 MPa or less.

At this time, by opening the air vent 13b provided in the closing lid 13 of the butterfly valve 12 so as to be openable and closable, the air remaining in the branch pipe 10 is discharged to the outside. By doing so, the air in the branch pipe 10 which is a sealed space can be replaced by the in-pipe fluid introduced from the fluid injection port 13a, so that the inside of the branch pipe 10 can be filled with the in-pipe fluid.

Further, as shown in FIG. 5A, in the closing lid 13 of this embodiment, the air vent 13b is provided above the fluid injection port 13a and communicates with the closed space near the upper end in the branch pipe 10. It is preferable that the cells are formed in such a manner, and by doing so, substantially the entire amount of the air in the branch pipe 10 can be discharged to the outside. The fluid inlet 13a and the air vent 13b may be provided at the same height, or the fluid inlet 13a has a flange projecting above the air vent 13b, for example, above the housing 12a of the butterfly valve 12. It may be provided in the vicinity of the tubular portion 12d.

It should be noted that the embodiment in which the fluid flowing in the fluid pipe 1 is injected from the fluid pipe 1 into the branch pipe 10 via the communication opening 17, the connecting hose 20 and the fluid injection port 13a has been exemplified, but the present invention is not limited to this. If it is the same fluid as the fluid flowing in 1, the fluid may be injected into the branch pipe 10 from the outside through the fluid injection port 13a. Further, a fluid different from the fluid flowing in the fluid pipe 1 may be injected into the branch pipe 10.

Next, the valve opening step will be described. As described above, the inside of the branch pipe 10 is filled with the fluid in the pipe, and the fluid pipe 1 side and the branch pipe 10 side in the housing 5 sandwiching the working valve body 31 have substantially the same pressure. After closing the fluid inlet 13a and the air vent 13b, the working valve body 31 is opened (see FIG. 6).

At this time, as described above, the pressure inside the branch pipe 10 is adjusted to substantially the same pressure as the inside of the fluid pipe 1 by the pressure adjusting step, and since the pressure difference does not exist or is slight, the working valve body 31 is inside the fluid pipe 1. The seal member 31a attached to the working valve body 31 is excessively pressed against the side wall 5j of the recessed portion 5g formed in the neck portion 5d of the housing 5, and the working valve is excessively pressed by their frictional force. It is possible to avoid the possibility that the valve opening operation of the body 31 becomes difficult or damaged. That is, the working valve body 31 can be smoothly opened. Further, it is possible to suppress the displacement or damage of the seal member 31a due to the frictional force caused by the opening of the working valve body 31.

Further, in the pressure adjusting step, the fluid in the pipe flowing on the fluid pipe 1 side in the housing 5 sandwiching the work valve body 31 is filled in the branch pipe 10 side, so that the fluid pipe 1 in the housing 5 sandwiching the work valve body 31 is filled. It is easy to adjust so that the pressure on the side and the branch pipe 10 side are close to the same pressure.

Next, the second step of the connection step of the branch pipe 10 will be described. First, as shown in FIG. 6, after the valve opening step of the working valve body 31, as shown in FIG. 7, the fluid pipe 1 is outside. The branch pipe 10 is pulled toward the fluid pipe 1 side by pressing the open end portion 12 g of the butterfly valve 12 with the hydraulic jack 4 fixed by using the fitted band 9. Further, while pulling the branch pipe 10 toward the fluid pipe 1, the plurality of fastening members 16 for fastening the flange portion 11b of the short pipe 11 and the flange portion 5e of the open end portion 5c of the neck portion 5d are tightened. Although the butterfly valve 12 is closed in FIG. 6, the butterfly valve 12 may be closed at any timing before or after the valve opening step of the working valve body 31 described above, and the connection step may be closed. The butterfly valve 12 may be opened in the two steps. Further, the connecting hose 20 may be removed. Further, the branch pipe 10 may be pulled in by using the fastening member 16 without using the hydraulic jack 4, or may be pulled in by using the hydraulic jack 4 or other hydraulic jack and the fastening member 16 in combination.

Then, as shown in FIG. 8, the plurality of fastening members 16 are tightened to a position where the side end surface of the flange portion 11b of the short pipe 11 and the side end surface of the flange portion 5e of the open end portion 5c of the neck portion 5d are in contact with each other or close to each other. By being inserted, the second step of the connection step of the branch pipe 10 is completed.

Further, a sealing member is provided between the side end surface of the flange portion 11b of the short pipe 11 and the side end surface of the flange portion 5e of the open end portion 5c of the neck portion 5d, and this sealing member is the flange portion of the short pipe 11. By being in close contact with 11b, the short pipe 11 constituting the branch pipe 10 and the neck portion 5d of the housing 5 are sealed in this fastened state.

Further, at this time, the tip surface of the insertion portion 11a of the short tube 11 fitted in the open end portion 5c of the housing 5 abuts on the step portion 5i formed on the inner peripheral portion of the neck portion 5d. By doing so, the recessed portion 5g, which is the insertion portion of the working valve body 31 formed in the inner peripheral portion of the neck portion 5d, can be closed from the inside by the insertion portion 11a of the short pipe 11.

Further, the seal member 14 provided on the outer peripheral surface of the insertion portion 11a of the short pipe 11 is on the step portion 5i side that sandwiches the recessed portion 5g in the axial direction of the neck portion 5d, and the seal member 15 is also the open end that sandwiches the recessed portion 5g. By closely contacting the inner peripheral surface 5f of the neck portion 5d on the portion 5c side, the inside of the branch pipe 10 and the recessed portion 5g are closed in a sealed manner, and the work valve 3 can be removed, which saves space and allows the work valve 3 to be removed. It can be applied to others and can prevent aging. The opening 5b that opens above the neck 5d is closed from the outside by the plug member 5m.

Further, with the butterfly valve 12 closed, the closing lid 13 is removed from one open end portion 12g of the butterfly valve 12, and a new branch pipe 10A is connected to the branch pipe 10 in a sealed manner (see FIG. 8). .. The new branch pipe 10A is preferably provided with an air vent such as an air valve, and it is preferable that a pressure gauge can be installed at the air vent, which can be used for a water pressure test. can.

According to this, the method of connecting the branch pipe 10 using the work valve 3 of the present invention includes a hole forming step of drilling or cutting the fluid pipe 1 in the housing 5 in the open state of the work valve body 31. A connection step in which the branch pipe 10 is hermetically connected to the neck portion 5d of the housing 5 in the shutoff state of the work valve body 31, and the fluid pipe 1 side and the branch pipe in the housing 5 sandwiching the work valve body 31 in the shutoff state. By having a pressure adjusting step for reducing the differential pressure from the 10 side and a valve opening step for opening the working valve body 31, the fluid pipe 1 side and the branch pipe 10 side in the housing 5 sandwiching the working valve body 31 are provided. In order to open the working valve body 31 in a state where the pressure difference between the working valve body 31 and the working valve body 31 is reduced, the working valve body 31 excessively reaches the inner peripheral surface of the neck portion 5d, that is, the side wall 5j of the recessed portion 5g due to the pressure of the fluid flowing through the fluid pipe 1. Pressure contact is avoided, and the valve body can be easily opened.

Further, in the pressure adjusting step, the same fluid as the in-pipe fluid on the fluid pipe 1 side is discharged into the branch pipe 10 while discharging the air in the sealed space formed on the branch pipe 10 side in the housing 5 sandwiching the work valve body 31. By filling in, the air and the fluid in the branch pipe 10 which is a sealed space are replaced, so that the fluid in the pipe can be branched without leaving air in the branch pipe 10. Further, it is possible to prevent the air from being compressed in the branch pipe 10 and the generation of water hammer.

Further, in the pressure adjusting step, the in-pipe fluid on the fluid pipe 1 side sandwiching the working valve body 31 is filled in the branch pipe 10, so that the inside of the neck portion 5d of the housing 5 sandwiching the working valve body 31 and the inside of the branch pipe 10 are filled. Since the same fluid in the fluid pipe 1 is filled, it is easy to adjust the pressure inside the neck portion 5d of the housing 5 sandwiching the work valve body 31 and the inside of the branch pipe 10 to be close to the same pressure.

Further, the connection step is a first step in which the branch pipe 10 is internally fitted into the neck portion 5d of the housing 5 in the shutoff state of the work valve body 31, and a branch in the neck portion 5d after the valve opening step of the work valve body 31. By having a second step of pulling the pipe 10 from the recessed portion 5g of the working valve body 31 to the fluid pipe 1 side, the final connection of the branch pipe 10 to the neck portion 5d of the housing 5 in the second step is made. By doing so, the recessed portion 5 g, which is the insertion portion of the work valve body 31, can be closed from the inside by the branch pipe 10, so that the structure of the work valve 3 can be simplified and the work valve 3 can be removed. ..

Further, in the connection step, the housing is fixedly supported so that the axis of the neck portion 5d of the housing 5 extends in the substantially horizontal direction, and the branch pipe 10 movably supported in the pipe axis direction is internally fitted to the housing. The branch pipe 10 can be stably connected to the neck portion 5d of the body 5.

Next, the working valve in the first modification will be described with reference to FIG. As shown in FIG. 9, the working valve 103 of the modified example 1 is provided with a communication hole 131b that penetrates the working valve body 131 as a valve body in the thickness direction at a side portion thereof.

A water stop plug 93 as a switching means is screwed into the communication hole 131b. The shaft portion 93a of the water stop plug 93 has a cylindrical shape, and openings 93b are formed so as to communicate with each other at the substantially center and sideways in the axial direction thereof. Further, a lid portion 93c projecting in the outer diameter direction is formed at the end portion of the shaft portion 93a on the branch pipe 10 side, and a sealing member provided on the back surface of the lid portion 93c is provided on the side surface of the work valve body 131. By contacting the bottom surface of the formed recess 131c, the communication hole 131b is closed in a sealed manner. Here, the shaft portion 93a and the communication hole 131b are screw-fitted.

In the first step of the connection step of the branch pipe 10 before the pressure adjustment step, the communication hole 131b is closed by the water stop plug 93. As a result, the fluid on the fluid pipe 1 side in the housing 5 sandwiching the work valve body 131 is prevented from flowing into the branch pipe 10 side in the housing 5 sandwiching the work valve body 131 through the communication hole 131b. Ru.

Further, in the pressure adjusting step, a predetermined tool (not shown) inserted from one open end portion 12g of the butterfly valve 12 by opening the butterfly valve 12 in a state where the inside of the housing 5 is closed by the working valve body 131 is used. Use to loosen the water stop plug 93. As a result, the opening 93b of the water stop plug 93 is opened to the branch pipe 10 side, and the fluid in the fluid pipe 1 flows into the branch pipe 10. After that, the butterfly valve 12 is closed and the branch pipe 10 is filled with the fluid, so that the fluid pipe 1 side and the branch pipe 10 side of the housing 5 sandwiching the working valve body 131 are adjusted or substantially the same pressure. can do.

At this time, by opening the opening / closing plug 111f screwed into the air vent 111e that opens above the short pipe 111 constituting the branch pipe 10, the air remaining in the branch pipe 10 is discharged to the outside. By doing so, the air in the branch pipe 10 which is a sealed space can be replaced by the in-pipe fluid introduced from the communication hole 131b, so that the inside of the branch pipe 10 can be filled with the in-pipe fluid. It is preferable that a pressure gauge can be installed at the air vent 111e of the short pipe 111, which can be used for a water pressure test.

According to this, when the working valve body 131 is closed, the fluid in the fluid pipe 1 can be shut off by making the communication hole 131b non-communication state by the water stop plug 93, and communication is possible by the water stop plug 93. By setting the hole 131b in a communicating state, the fluid pipe 1 side and the branch pipe 10 side of the housing 5 of the housing 5 sandwiching the working valve body 131 can have substantially the same pressure, so that the working valve body 131 can be simplified. The valve can be opened.

Further, when the working valve body 131 is closed, the sealing member 31a is placed in the recessed portion 5g by utilizing the differential pressure between the fluid pipe 1 side and the branch pipe 10 side of the housing 5 of the housing 5 sandwiching the working valve body 131. It can be pressed against the side wall 5j to maintain the closed state. Further, when the working valve body 131 is opened, the communication hole 131b is set to communicate with the water stop plug 93 in advance, and the fluid pipe 1 side and the branch pipe 10 side of the housing 5 of the housing 5 sandwiching the working valve body 131 are connected. By setting the pressure to be substantially the same, it is possible to prevent the seal member 31a from being worn or damaged due to the movement of the working valve body 131.

The switching means is not limited to the water stop plug 93 as long as the communication hole 131b can be opened and closed, and may be freely changed.

Next, the pressure adjustment step in the second modification will be described with reference to FIG. As shown in FIG. 10, in the pressure adjusting step of the present modification 2, the working valve body 31 is opened in a state where the branch pipe 10 is hermetically connected to the open end portion 5c of the housing 5 as described above. Prior to this, a communication opening 17 provided in the neck portion 5d of the housing 5 and a fluid injection port 211g provided so as to be openable and closable below the short pipe 211 constituting the branch pipe 10 are communicated with each other by a connecting hose 220. Let me. By doing so, the fluid in the fluid pipe 1 is gradually introduced into the branch pipe 10 by the fluid pressure via the communication opening 17, the connecting hose 220, and the fluid injection port 211g. It is preferable that a pressure gauge capable of measuring the pressure in the branch pipe 10 is installed in the fluid injection port 211g.

Further, in the pressure adjusting step of the present modification 2, the butterfly valve body 12c is closed by using the butterfly valve 12 without attaching the closing lid 13 (see FIG. 5) to one open end portion 12g of the butterfly valve 12. Do it in a valved state.

By introducing the fluid in the fluid pipe 1 into the branch pipe 10 and filling the branch pipe 10 in this way, the inside of the branch pipe 10 and the inside of the fluid pipe 1 are connected before the working valve body 31 is opened. It can be adjusted to reduce substantially the same pressure or differential pressure.

At this time, by opening the air vent 211e provided above the short pipe 211 so as to be openable and closable, the air remaining in the branch pipe 10 is discharged to the outside. By doing so, the air in the branch pipe 10 which is a sealed space can be replaced by the in-pipe fluid introduced from the fluid injection port 211g, so that the inside of the branch pipe 10 can be filled with the in-pipe fluid. Further, according to the present modification 2, it is sufficient to fill the sealed space smaller on the fluid pipe 1 side than the butterfly valve body 12c with the fluid in the pipe, so that the step of the pressure adjusting step can be shortened.

Next, a method of connecting the branch pipe using the working valve according to the second embodiment will be described with reference to FIG. It should be noted that the description of the same configuration as that of the first embodiment and the overlapping configuration will be omitted. In the second embodiment, the same work as in the first embodiment is performed up to the hole forming step, the first step of the connection step, the pressure adjusting step, and the valve opening step.

In the second embodiment, after the valve opening step, as shown in FIG. 11, the mounting flange cylinder 301 constituting the working case 300 as a surrounding member is fitted on the flange portion 5e of the neck portion 5d in a sealed manner. As shown in FIG. 11B, the mounting flange cylinder 301 is composed of four divided bodies in the circumferential direction, and each divided body is joined in a sealed state by a fastening member 305 made of bolts and nuts. There is. Further, a plurality of operation cylinders 301b are joined to the mounting flange cylinder 301 in a sealed state, and a push bolt 306 screwed into a female screw portion in the operation cylinder 301b is attached from the outside of the mounting flange cylinder 301. By tightening, the mounting flange cylinder 301 is hermetically connected to the flange portion 5e of the neck portion 5d.

The annular flange portion 302b protruding in the outer diameter direction from the open end portion 302a of the box-shaped accommodating member 302 constituting the work case 300 with respect to the flange portion 301a of the mounting flange cylinder 301 is composed of bolts and nuts (not shown). The branch pipe 10 is enclosed in a sealed shape by the work case 300 by joining in a sealed state with a fastening member.

The side wall portion 302c of the accommodating member 302 is provided with a fluid inlet 303 at the bottom and an air vent 304 at the top. Further, the side wall portion 302c is provided with a plurality of through holes 302d through which a plurality of push bolts 307 can be inserted. An operation cylinder 302e is joined to the side wall portion 302c in a sealed state so as to communicate with a plurality of through holes 302d, and a push bolt 307 screwed into a female screw portion in the operation cylinder 302e is housed in the accommodating member 302. It can be tightened from the outside of. The tip of the push bolt 307 is in contact with the closing lid 13 attached to one open end portion 12g of the butterfly valve 12 constituting the branch pipe 10 surrounded by the work case 300.

Inside the accommodating member 302, an adjuster A for vertically moving a jack J with a roller R that supports the branch pipe 10 so as to be movable in the pipe axis direction is provided. The adjuster A supports the branch pipe 10 by a jack J with a roller R by adjusting the tightening amount of the bolt 308 accommodated in the operation cylinder 302f provided below the accommodating member 302 from the outside of the accommodating member 302. You can change the height as you can.

The mounting flange cylinder 301 and the accommodating member 302 constituting the work case 300 are fixedly supported by a jack J or the like so that the axis of the branch pipe 10 extends in the horizontal direction.

As described above, with the branch pipe 10 surrounded by the work case 300 in a sealed manner, the communication opening 17 provided in the neck portion 5d of the housing 5 as a pressure adjusting step before the second step of the connection step. And the fluid injection port 303, which is openably and closably provided on the side wall portion 302c of the accommodating member 302 constituting the work case 300, are communicated with each other by the connecting hose 20. By doing so, the fluid in the fluid pipe 1 is gradually introduced into the working case 300 by the fluid pressure through the communication opening 17, the connecting hose 20, and the fluid inlet 303. It is preferable that the fluid inlet 303 is provided with a pressure gauge capable of measuring the pressure inside the work case 300.

By introducing the fluid in the fluid pipe 1 into the work case 300 and filling the work case 300 in this way, the fluid pipe 1 and the work case 300 are branched into the work case 300 before the second step of the connection step is performed. The pressure inside the tube 10 can be adjusted to substantially the same. In the pressure adjustment step of the second embodiment, a differential pressure may be generated between the inside of the work case 300 and the inside of the fluid pipe 1 and the branch pipe 10, but it is preferably 1.5 MPa or less.

At this time, by opening the air vent 304 that can be opened and closed in the accommodating member 302, the air remaining in the work case 300 is discharged to the outside. By doing so, the air in the work case 300, which is a sealed space, can be replaced by the in-pipe fluid introduced from the fluid inlet 303, so that the inside of the work case 300 can be filled with the in-pipe fluid.

It should be noted that the embodiment in which the fluid flowing in the fluid pipe 1 is injected from the fluid pipe 1 into the work case 300 via the communication opening 17, the connecting hose 20, and the fluid injection port 303 has been exemplified, but the present invention is not limited to this. If it is the same fluid as the fluid flowing in 1, the fluid may be injected into the work case 300 from the outside through the fluid injection port 303. Further, a fluid different from the fluid flowing in the fluid pipe 1 may be injected into the work case 300.

Next, the second step of the connection step of the branch pipe 10 in the second embodiment will be described. After the pressure adjustment step of the second embodiment described above, the push bolt screwed into the female screw portion in the plurality of operation cylinders 302e. The branch pipe 10 is pulled toward the fluid pipe 1 side by tightening the 307 from the outside of the accommodating member 302. Although the butterfly valve 12 is closed in FIG. 11, the butterfly valve 12 may be opened in the second step of the pressure adjusting step or the connecting step in the accommodating member 302 in the second embodiment.

Then, a plurality of push bolts 307 are tightened to a position where the side end surface of the flange portion 11b of the short pipe 11 and the side end surface of the flange portion 5e of the open end portion 5c of the neck portion 5d come into contact with each other, and the push bolts on the branch pipe 10 side are tightened. At 306, the flange portion 11b of the short pipe 11 is fixed, the accommodating member 302 is removed, then the fastening member 16 is tightened, and the mounting flange cylinder 301 is removed. Complete. The fastening member 16 is preferably replaced with a bolt having a short overall length.

According to this, at the time of the second step of the connection step of pulling the branch pipe 10 into the neck portion 5d by reducing the differential pressure inside and outside the neck portion 5d of the housing 5 attached to the fluid pipe 1 and inside and outside the branch pipe 10. Since the resistance of the generated fluid can be reduced, it can be pulled in with a small force. Since the inside of the work case 300 does not constitute a pipeline, in the pressure adjustment step of the second embodiment, if the resistance of the fluid generated in the second step of the connection step can be reduced, the work case 300 can be used. It is not necessary to completely fill the inside with the fluid in the pipe.

Next, a method of connecting the branch pipe using the working valve according to the third embodiment will be described with reference to FIGS. 12 to 14. It should be noted that the description of the configuration overlapping with the same configuration as the first and second embodiments will be omitted.

As shown in FIG. 12, the punching machine 407 of the third embodiment is not provided with the sweep-out portion 90 (see FIG. 2) composed of the hair-like members 91, 91, ... It has the same configuration as the drilling machine 7 of the first embodiment except that the shape body 478 and the operation unit 479 are provided.

More specifically, inside the mounting flange cylinder 471, a cylindrical tubular body 478 that movably accommodates the cutter 472 is provided so as to be movable in the horizontal direction with respect to the mounting flange cylinder 471. The tubular body 478 covers the opening of the recessed portion 5 g by pushing and pulling the operation portion 479 which is fixed to the base end side thereof and which is extended to the outside of the mounting flange cylinder 471 in a sealed state. It is designed to be inserted into the neck portion 5d up to the position where it is to be used. Further, the tubular body 478 is positioned at a predetermined position covering the opening of the recessed portion 5g by fixing the operating portion 479 with the fixing screw 479a screwed into the mounting flange cylinder 471. The positioning is not limited to the one using the fixing screw 479a, and may be, for example, a mechanism for pressing the head of the operation unit 479. Further, the tubular body 478 is not limited to the one formed in a cylindrical shape, and may be formed in a semi-cylindrical shape or a substantially C-shape.

Further, since the tubular body 478 is slidably arranged along the inner peripheral surface 5f of the neck portion 5d, the accuracy of movement of the tubular body 478 is improved, and the recessed portion 5g is reliably closed or closed. Can be opened.

Further, the outer peripheral surface of the tubular body 478 is arranged close to the inner peripheral surface 5f of the neck portion 5d, and by doing so, foreign matter can be prevented from entering the recessed portion 5g.

Next, the step of forming the hole portion of the fluid pipe 1 by the drilling machine 407 will be described. First, in a state where the working valve body 31 of the working valve 3 is arranged in the accommodating inner portion 32a of the accommodating member 32 and the inside of the housing 5 is opened, the inside of the housing 5 is opened. The cutter 472 is rotated by the drive motor 474 of the drilling machine 407, and the cutter 472 is moved in the horizontal direction by the advancing / retreating mechanism 473 to drill the pipe wall on the side of the fluid pipe 1 in a continuous flow state.

The tip surface 478a of the tubular body 478 of this embodiment is formed in a flat shape, and the tip surface 478a is in contact with the stepped portion 5i formed in the neck portion 5d, so that the tubular body 478 can be inserted. It is supposed to be completed.

At this time, especially in the horizontal branch as in the present embodiment, a part of the chips of the fluid pipe 1 generated at the time of drilling tries to enter the neck portion 5d, but the opening of the recessed portion 5 g is formed into a cylinder. Since the shape 478 is closed, it is possible to prevent chips from entering the recessed portion 5 g. The chips that have entered the neck portion 5d will be deposited or adhered to the inner surface of the tubular body 478 that covers the recessed portion 5g. At this time, for example, an elastic body is adhered or vulcanized to the outer peripheral portion of the tubular body 478, and a gap between the inner peripheral surface 5f of the neck portion 5d and the recessed portion 5g, or a gap between each arbitrary portion only. May be eliminated.

In the third embodiment, after performing the work up to the first step of the hole forming step and the same connection step as in the first embodiment, the pressure adjusting step in the third embodiment is performed.

Next, the pressure adjusting step in the third embodiment will be described. First, as shown in FIG. 13, the working valve body 31 is opened in a state where the branch pipe 10 is hermetically connected to the open end portion 5c of the housing 5. The work case 400 as a surrounding member is hermetically connected to the flange portion 5e of the neck portion 5d. The work case 400 of the third embodiment is the same as the work case 300 of the second embodiment except that an operation unit 402g capable of opening and closing the operation device 12e of the butterfly valve 12 from the outside is provided above the accommodating member 402. It is composed of. Further, in the third embodiment, it is not necessary to provide the closing lid 13 on one open end portion 12g of the butterfly valve 12, and the tip of the push bolt 408 is the one open end portion 12g of the butterfly valve 12 in the work case 400. It is in direct contact with the side end face of.

Next, the branch pipe 10 is provided in the neck portion 5d of the housing 5 with the butterfly valve 12 opened before the second step of the valve opening step and the connection step, with the branch pipe 10 surrounded by the work case 400 in a sealed shape. The communication opening 17 is communicated with the fluid injection port 403 provided so as to be openable and closable in the accommodating member 402 constituting the work case 400 by the connecting hose 20. By doing so, the fluid in the fluid pipe 1 is gradually introduced into the work case 400 by the fluid pressure through the communication opening 17, the connecting hose 20, and the fluid inlet 403. It is preferable that the fluid inlet 403 is provided with a pressure gauge capable of measuring the pressure inside the work case 400.

In this way, by introducing the fluid in the fluid pipe 1 into the work case 400 and filling the work case 400, the fluid in the fluid pipe 1 is also introduced into the branch pipe 10 in which the butterfly valve 12 is opened. Can be filled. That is, before performing the second step of the valve opening step and the connecting step, the outside and the inside of the branch pipe 10 can be adjusted to substantially the same pressure in the work case 400. In the pressure adjusting step of the third embodiment, a differential pressure may be generated between the work case 400 and the branch pipe 10 and the fluid pipe 1, but it is preferably 1.5 MPa or less.

At this time, by opening the air vent 404 provided in the accommodating member 402 so as to be openable and closable, the air remaining in the work case 400 is discharged to the outside. By doing so, the air in the work case 400, which is a sealed space, can be replaced by the in-pipe fluid introduced from the fluid inlet 403, so that the inside of the work case 400 can be filled with the in-pipe fluid.

It should be noted that the embodiment in which the fluid flowing in the fluid pipe 1 is injected from the fluid pipe 1 into the branch pipe 10 via the communication opening 17, the connecting hose 20, and the fluid injection port 403 has been exemplified, but the present invention is not limited to this. If it is the same fluid as the fluid flowing in 1, the fluid may be injected from the outside into the work case 400 and the branch pipe 10 through the fluid injection port 403. Further, a fluid different from the fluid flowing in the fluid pipe 1 may be injected into the work case 400 and the branch pipe 10.

Next, the valve opening step will be described. As described above, the inside of the work case 400 and the branch pipe 10 is filled with the fluid in the pipe, and the fluid pipe 1 side in the housing 5 sandwiching the work valve body 31 and the work case 400 and the branch The pressure on the pipe 10 side is adjusted to substantially the same pressure, the fluid inlet 403 and the air vent 404 are closed, and then the working valve body 31 is opened (see FIG. 14).

At this time, as described above, the pressure in the branch pipe 10 is adjusted to substantially the same pressure as in the fluid pipe 1 by the pressure adjusting step, and since there is no pressure difference, the working valve body 31 is the pressure of the fluid in the fluid pipe 1. The seal member 31a mounted on the working valve body 31 is pressed more and is excessively pressed against the side wall 5j of the recessed portion 5g formed in the neck portion 5d of the housing 5, and the working valve body 31 is opened by the frictional force thereof. It avoids the possibility that the valve operation becomes difficult or damaged. That is, the working valve body 31 can be smoothly opened. Further, it is possible to suppress the displacement and damage of the seal member 31a due to the opening of the working valve body 31.

Next, the second step of the connection step of the branch pipe 10 will be described. As shown in FIG. 14, after the valve opening step of the third embodiment described above, the screw is screwed into the female screw portion in the plurality of operation cylinders 402e. The branch pipe 10 is pulled toward the fluid pipe 1 side by tightening the push bolt 408 to be tightened from the outside of the accommodating member 402.

Then, a plurality of push bolts 408 are tightened to a position where the side end surface of the flange portion 11b of the short pipe 11 and the side end surface of the flange portion 5e of the open end portion 5c of the neck portion 5d come into contact with each other, and the push bolts on the branch pipe 10 side are tightened. The flange portion 11b of the short pipe 11 is fixed by 306.

According to this, at the time of the second step of the connection step of pulling the branch pipe 10 into the neck portion 5d by reducing the differential pressure inside and outside the neck portion 5d of the housing 5 attached to the fluid pipe 1 and inside and outside the branch pipe 10. Since the resistance of the generated fluid can be reduced, it can be pulled in with a small force. Since the inside of the work case 400 does not constitute a pipeline, in the pressure adjustment step of the third embodiment, if the resistance of the fluid generated in the second step of the connection step can be reduced, the work case 400 can be used. It is not necessary to completely fill the inside with the fluid in the pipe.

Further, in the state where the second step of the connection step is completed, the operation device 12e of the butterfly valve 12 can be operated by the operation unit 402g of the accommodating member 402, and the butterfly valve 12 can be closed. After that, the accommodating member 402 is removed, the fastening member 16 is replaced with a bolt having a short overall length and tightened, the flange portion 11b of the short pipe 11 is fixed to the flange portion 5e of the neck portion 5d, and the mounting flange cylinder 301 is removed. Therefore, a new branch pipe (not shown) can be connected to the branch pipe 10.

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. Further, each embodiment and each modification may be used in combination with available configurations, or may be applied to each other. For example, the punching machine 407 of the third embodiment may be applied instead of the punching machine 7 in the first embodiment.

For example, in the above embodiment, the form of drilling with a hole saw has been exemplified, but the drilling is not limited to this, and drilling may be performed with a drilling machine such as an end mill, a bite device, or a wire saw device.

Further, in the above embodiment, in the pressure adjusting step, a mode in which the fluid pipe side and the branch pipe side in the housing sandwiching the working valve body have the same pressure is exemplified, but the pressure is not limited to this, and the working valve body is sandwiched. The pressure may not be the same as long as the differential pressure between the fluid pipe side and the branch pipe side in the housing is reduced, and the pressure may be substantially the same. The differential pressure is preferably 1.5 MPa or less, but is not limited to this.

Further, in the above embodiment, the embodiment in which the branch pipe is composed of a short pipe and a butterfly valve is exemplified, but the present invention is not limited to this, and the branch pipe is connected to the branch portion of the housing with the working valve closed. It suffices as long as the space in the branch portion constitutes a closed space. For example, a butterfly valve may be connected to a branch portion, a gate valve, a ball valve, a switching valve, or the like may be connected instead of the butterfly valve, or a branch pipe may be directly connected to the branch portion. ..

Further, in the above embodiment, the side wall of the recessed portion formed on the inner peripheral portion of the neck portion of the housing is exemplified by a form formed by a wall surface extending substantially vertically from the inner bottom surface toward the opening. The side wall of the recessed portion may be formed by a tapered surface gradually opened from the inner bottom surface toward the opening. By doing so, the fluidity of the fluid in the recess can be increased, so that the chips that have entered or are about to enter the recess together with the fluid do not stay in the hole forming step. , It is possible to facilitate the outflow to the outside of the recessed portion along the tapered surface. Further, the direction of the taper may be gradually opened from the opening toward the inner bottom surface to prevent the ingress of chips.

Further, the inner peripheral portion of the neck portion of the housing may not be provided with a recessed portion which is a groove as a valve seat portion.

Further, in the above embodiment, the embodiment in which the working valve body is provided with a ring-shaped sealing member is exemplified, but the present invention is not limited to this, and the entire working valve body may be covered with rubber or the like.

1 Fluid pipe 3 Work valve 4 Hydraulic jack 5 Housing 5d Neck (branch)
5g recessed part (valve seat part, groove)
7 Drilling machine 8,8'Exhaust machine 10,10A Branch pipe 11 Short pipe 12 Butterfly valve 13 Closure lid 13a Fluid inlet 13b Air vent 17 Communication opening 20 Connection hose 21 Push ring 31 Work valve body (valve body)
31a Seal member 32 Accommodating member 90 Sweeping part 91 Hair-like member 93 Water stop plug (switching means)
103 Work valve 111 Short pipe 111e Air vent 131 Work valve body (valve body)
131b Communication hole 211 Short pipe 211e Air vent 211g Fluid injection port 220 Connection hose 300 Work case (surrounding member)
301 Mounting flange cylinder 302 Accommodating member 303 Fluid inlet 304 Air vent 400 Work case (surrounding member)
407 Drilling machine 478 Cylindrical body

Claims (8)

A method for connecting a branch pipe using a working valve including a housing in which the fluid pipe is fitted in a sealed state and a valve body in which the branch portion in the housing can be closed or opened in a sealed manner.
A hole forming step for drilling or cutting the fluid pipe in the housing in the open state of the valve body, and a connection step for connecting the branch pipe to the branch portion of the housing in the closed state of the valve body. It is characterized by having a pressure adjusting step for reducing the differential pressure between the fluid pipe side and the branch pipe side in the housing that sandwiches the valve body in the shut-off state, and a valve opening step for opening the valve body. How to connect a branch pipe using a working valve. The pressure adjusting step is characterized in that the branch pipe is filled with the same fluid as the fluid on the fluid pipe side while discharging the air in the sealed space formed on the branch pipe side sandwiching the valve body. Item 2. A method for connecting a branch pipe using the working valve according to Item 1. The method for connecting a branch pipe using a working valve according to claim 1 or 2, wherein the pressure adjusting step fills the branch pipe with a fluid on the fluid pipe side that sandwiches the valve body. In the connection step, the branch pipe is fitted into the branch portion of the housing in the closed state of the valve body, and after the valve opening step, the branch pipe in the branch portion is fitted to the valve body. The method for connecting a branch pipe using the work valve according to any one of claims 1 to 3, further comprising a second step of pulling the fluid pipe from the valve seat portion of the above. The connection step is characterized in that the branch pipe movably supported in the pipe axial direction is internally fitted in a state of being fixedly supported so that the axial center of the branch portion of the housing extends in a substantially horizontal direction. A method for connecting a branch pipe using the work valve according to any one of claims 1 to 4. The work valve according to claim 4 or 5, wherein the pressure adjusting step is filled with the fluid in the fluid pipe into the surrounding member that surrounds the branch pipe in a sealed manner before the second step. How to connect a branch pipe using. It is a work valve used for connecting branch pipes, including a housing that is externally fitted to the fluid pipe in a sealed state and a valve body that can shut off or open the fluid at the branch portion in the housing in a sealed manner. ,
The valve body is provided with a communication hole penetrating the valve body.
The valve body is a working valve having a switching means for switching the communication hole into a communication state or a non-communication state. The valve body has a sealing member at the end on the branch pipe side, and is characterized by being movable along a groove as a valve seat portion formed in the circumferential direction inside the branch portion of the housing. The work valve according to claim 7.

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