JP2006250295A - Continuous water gate valve installing method for existing fluid pipe and gate valve installing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous water gate valve installing method for an existing fluid pipe and a gate valve installing device capable of shortening the installing process without requiring works to install again a power transmitting means after a gate valve is installed. <P>SOLUTION: The power transmitting means 28 and a cover 2 able to cover it watertightly are installed on the oversurface of a top lid 5 placed on the gate valve 4, and the cover 2 is removed after the valve element 7 side of a casing 10 is sealed watertightly with the top lid 5, and thereby the installing process can be shortened without requiring the operation of installing again the power transmitting means after the gate valve is installed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, an existing fluid pipe is sealed with a sealing case, a predetermined portion of the existing fluid pipe is excised in an indefinite water state, a gate valve is inserted into the sealing case, and a flow path is shut off or a flow path The present invention relates to a continuous water gate valve installation method and gate valve installation device for an existing fluid pipe.

  The conventional method for installing a continuous water gate valve and a gate valve installation device for an existing fluid pipe is to place the gate valve in a state where the power transmission means capable of operating the valve body is removed at a predetermined location in the sealed case in the continuous water state. Installation work is performed (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 6-17986 (page 2, FIG. 1)

  However, in Patent Document 1, when the target gate valve is increased in size, the power transmission means is partitioned after the gate valve with the power transmission means removed is installed in a sealed case in an uninterrupted water state. Since the operation of re-attaching to the valve is performed, there is a problem that the labor and process increase.

  The present invention has been made paying attention to such problems, and it is not necessary to install an existing fluid pipe that can shorten the installation process without requiring the work of installing the power transmission means again after the gate valve is installed. It aims at providing a water gate valve installation method and a gate valve installation device.

In order to solve the above-mentioned problem, the continuous fluid gate valve installation method for an existing fluid pipe according to claim 1 of the present invention is characterized in that a part of the existing fluid pipe is sealed in a watertight manner with a sealing case, and the existing fluid pipe The predetermined excision location is excised in an indefinite water state, and the predetermined excision location is formed by an insertion means capable of pushing the inside of the sealing case with a gate valve composed of at least an upper lid and a valve element operable by power transmission means. Substantially at the same time as installing the valve body side in the sealing case with the upper lid in a watertight manner, blocking the flow path or forming a flow path, a continuous water partition valve installation method for an existing fluid pipe, ,
On the upper surface of the upper lid, the power transmission means and a cover capable of watertightly covering the power transmission means are attached in advance, and after the valve body side is watertightly sealed by the upper lid, It is characterized by removing.
According to this feature, a cover capable of watertightly covering the power transmission means is previously attached to the upper surface of the upper lid of the gate valve, and the power transmission means is previously provided on the upper surface of the upper lid in a watertight sealed case. Since the gate valve can be installed in a state where the gate is attached, the installation process can be shortened without requiring the work of installing the power transmission means again after the gate valve is installed.

The continuous fluid gate valve installation method for an existing fluid pipe according to claim 2 of the present invention is the continuous water partition valve installation method for an existing fluid pipe according to claim 1, wherein the sealing case is connected to each other's connection port. A work case having an opening / closing valve that is detachably connected to the inside of the sealing case and a housing, and the predetermined excision point is provided in the housing, In the vicinity of the connection port, the cover and the work case are removed after the inside of the casing is watertightly sealed with the upper lid.
According to this feature, the sealing case includes a work case that is separably connected and has an on-off valve, and a housing. After sealing the inside of the housing with the upper lid in the vicinity of the housing, the cover and the work case By removing the, the casing that is left behind by sealing the existing fluid pipe after the gate valve is installed can be miniaturized, so that the casing can be easily sealed to the existing fluid pipe.

The continuous fluid gate valve installation device for an existing fluid pipe according to claim 3 of the present invention seals a part of the existing fluid pipe in a sealing case in a water-tight manner, and the predetermined excision site of the existing fluid pipe is in a continuous water state. The gate valve comprising at least the upper lid and a valve element operable by the power transmission means is installed at the predetermined excision location by the insertion means capable of pushing the inside of the sealing case, An uninterrupted water gate valve installation device for an existing fluid pipe that forms a cutoff or flow path,
When the gate valve is installed, the upper lid seals the valve body side inside the sealing case in a watertight manner, and the upper surface of the upper lid can be covered with the power transmission means and the power transmission means in a watertight manner in advance. And a cover detachably attached to the upper lid.
According to this feature, a cover capable of watertightly covering the power transmission means is previously attached to the upper surface of the upper lid of the gate valve, and the power transmission means is previously provided on the upper surface of the upper lid in a watertight sealed case. Since the gate valve can be installed in the attached state, the inflow of the fluid flowing from the existing flow path is prevented by the cover, and the power transmission means can be protected at the time of installation.

The continuous fluid gate valve installation device for an existing fluid pipe according to claim 4 of the present invention is the continuous water partition valve installation device for an existing fluid pipe according to claim 3, wherein the sealing case is connected to each other's connection port. A work case having an opening / closing valve that is detachably connected to the inside of the sealing case and a housing, and the predetermined excision point is provided inside the housing. .
According to this feature, the sealed case includes a work case that is detachably connected and has an on-off valve, and a housing, and a predetermined excision point is provided inside the housing, whereby the inside of the housing is Since the work case can be removed together with the cover after sealing in a watertight manner, the structure after the gate valve is installed is simplified, and the cover and the work case can be reused.

According to a fifth aspect of the present invention, there is provided the continuous water partition valve installation device for an existing fluid pipe according to claim 3 or 4, wherein the power transmission means is a gear. It is a decelerating means.
According to this feature, since the gear speed reducing means is previously attached to the upper lid and covered with a watertight cover, fluid can be prevented from entering when the gate valve is installed. In addition to ensuring lubricity, it is possible to protect the lubricant adhering to the gear portion from entering the existing flow path.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a plan view showing an overall image of a pipe in which a casing provided with a gate valve is attached to an existing water pipe in an embodiment of the present invention. (A) is the top view which showed the state with which the existing water pipe was mounted | worn, and the flow direction of the fluid in a pipe | tube, (b) is the top view which similarly showed the state which cut | disconnected the existing water pipe, (c) FIG. 5 is a plan view showing an open state of a butterfly valve that is also installed inside the housing, and FIG. 6D is a plan view showing a closed state of the butterfly valve. FIG. 2A is a perspective view showing a butterfly valve according to the present invention, and FIG. 2B is a perspective view showing an entire image of a housing. Fig.3 (a) is the longitudinal cross-sectional view which showed the whole cover, (b) is AA sectional drawing of (a). FIG. 4A is a longitudinal sectional view showing a situation where the butterfly valve is installed, and FIG. 4B is a longitudinal sectional view showing a situation where the butterfly valve is similarly installed. FIG. 5 is a longitudinal sectional view showing the situation of the casing in which the butterfly valve is installed. Fig.6 (a) is the figure which showed the cutting condition of the existing water pipe, (b) is the figure which showed the condition of pipe piece removal similarly.

  Explaining the piping situation after installation of the continuous water gate valve installation device in the embodiment of the present invention, as shown in FIG. 1 (a), with respect to the flow direction of the fluid in the pipe of the existing water pipe 1, which is a water pipe, For example, the continuous water partition valve installation device comprising the casing 10 in the embodiment of the present invention is installed in the pipe portion on the upstream side of the specific area E that needs to be removed or repaired to a part of the existing water pipe 1. It is attached to the outer peripheral surface in a water-tight manner, and an existing water pipe 1 portion (predetermined excision location) inside the housing 10 is cut by a method described later (FIG. 1 (b)), and a butterfly valve 4 (partition) is provided at the cut location. 1 (c) and (d), the existing flow path of the existing water pipe 1 can be opened and closed as shown in FIGS.

  By arranging such a gate valve installation device, it is possible to operate so that the fluid in the pipe does not flow down to the specific area E of the existing water pipe 1, so that work such as removal or repair of the pipe portion located in the specific area E can be performed. It becomes possible.

  As shown in FIGS. 2 (a) and 2 (b), the gate valve installation device of the present embodiment is composed of a butterfly valve 4 and a housing 10 that change the flow path of an existing water pipe. A partition wall 6 having an opening H at the center, a valve body 7 that can be rotated around an opening / closing shaft 40 to open and close the opening H, and a horizontal direction integrally connected to the upper end of the partition wall 6. It comprises a circular upper lid 5 provided, and a reduction gear 28 (power transmission means) provided on the upper surface of the upper lid 5.

  An opening / closing shaft 40 extending in the vertical direction is provided at the left and right center position of the valve body 7, and as shown in FIG. 2A, the opening / closing shaft 40 extending downward from the lower peripheral edge of the valve body 7. The lower end of the shaft is fitted into a lower bearing portion 41b provided at the lower portion of the opening H and is pivotally supported. Similarly, the upper end portion of the opening / closing shaft 40 is fitted into an upper bearing portion 41 a provided on the upper surface of the upper lid 5 and is pivotally supported.

  Further, since the opening / closing shaft 40 is engaged with the operation shaft 29 via the gear portion 28a of the reduction gear 28 that is substantially coaxial with the opening / closing shaft 40, the opening / closing shaft 40 is rotated by rotating the operation shaft 29. The turning operation is transmitted so that the valve body 7 can be opened and closed.

  Therefore, the valve body 7 can rotate around the opening / closing shaft 40 and can open and close the opening H. The valve body 7 has substantially the same shape as the opening H, and in the closed state of the valve body 7. Since the entire periphery of the valve body 7 is in close contact with the valve seat portion 42 made of a seal member, it is sealed that the fluid in the pipe flows through the opening H.

  Further, when the butterfly valve 4 is installed, the upper portion of the upper lid 5 is hermetically sealed with the hollow interior S by the cover 2 described later, so that the butterfly valve 4 is mounted with the reduction gear 28 attached to the butterfly valve 4. Can be installed.

  As shown in FIG. 2B, the housing 10 can be divided into two upper and lower portions including an upper housing 11 and a lower housing 12. The casing 10 has a cylindrical shape having an inner diameter larger than the outer diameter of the existing water pipe 1. A circular connection port 10 a that opens upward is formed on the upper surface, and a circular shape that opens horizontally also on the side surface. Two side openings A and A 'are formed.

  In addition, the inner diameters of the side opening A and the side opening A ′ that have the same central axis C in the horizontal direction and that face each other on the side surface of the housing 10 are larger than the outer diameter of the existing water pipe 1. Are formed substantially the same or slightly larger, and a watertight rubber ring 14 is provided on the inner surface in the vicinity of both end portions of these side openings A and A ′.

  In addition, an upstream side opening 13a that can be opened and closed is provided on the lower side of the side surface of the casing 10 on the upstream side of the butterfly valve 4 installed inside the casing 10, and can be opened and closed on the downstream side of the butterfly valve 4 as well. A downstream port 13b is provided. At the time of cutting the existing water pipe 1 described later, the upstream side port 13 a and the downstream side port 13 b can communicate with the outside of the housing 10.

  Further, the fixed plug screw 23 screwed into the inner surface from the outer surface to the inner surface of the housing 10 is in a plan view of the housing 10 at a height position where it comes into contact with the upper surface of the upper lid 5 at the installation position of the butterfly valve 4 described later. Six places are arranged at substantially equal intervals in the circumferential direction.

  The mounting of the housing 10 to the existing water pipe 1 will be described. The upper housing 11 and the lower housing 12 are respectively connected to the central axis C and the central axis of the existing water pipe 1 from above and below the existing water pipe 1. At the matching position, it is attached to the outer periphery of the existing water pipe 1. The abutting portions 18 of the upper housing 11 and the lower housing 12 attached to the outer peripheral portion of the existing water pipe 1 are joined by welding. Further, in the opening A and the opening A ′, the rubber ring 14 is sandwiched between the flange 17 on the side of the casing 10 and the push ring 21 having a split structure, so that the outer peripheral surface of the casing 10 and the existing water pipe 1 is obtained. And joining.

  Therefore, the joining of the upper housing 11 and the lower housing 12 by welding, joining of both ends of the openings A and A ′ and the outer peripheral surface of the existing water pipe 1, and the upper lid 5 and the housing of the butterfly valve 4 described later. The inside of the housing 10 is watertight due to the joining of the inner surface of the body 10 in the vicinity of the connection port 10a.

  Next, as shown in FIGS. 3 (a) and 3 (b), the cover 2 of the present embodiment is a hollow interior having a substantially circular shape in plan view, with the upper surface and the side peripheral surface covered with a steel material and the lower portion opened. It consists of a cover body 24 having S. An annular member 25 having an outer diameter smaller than the outer diameter of the upper cover 5 of the butterfly valve 4 is fixed to the lower part of the side peripheral surface of the cover body 24. By connecting with bolts 27 via the bolt holes 25a of the annular member 25 and the tap holes 5a on the upper surface of the upper lid 5, a sealing material 8c provided annularly on the upper surface of the upper lid 5 shown in FIG. The lower surface of the annular member 25 is joined, and the hollow interior S of the cover body 24 is sealed in a watertight manner.

  Accordingly, the reduction gear 28 provided on the upper surface of the upper lid 5 is accommodated in the hollow interior S of the cover body 24 and is not submerged by the fluid from the existing water pipe 1. In the state attached to the butterfly, it is possible to perform an installation process of the butterfly valve 4 described later.

  In addition, four guide rollers 3 that are rotatable about a substantially horizontal roller shaft 36 are fixedly disposed at approximately equal intervals on the upper part of the side peripheral surface of the cover body 24. Further, a connection portion 26 that can be connected to an insertion rod 35 of an insertion machine 34 (insertion means) for inserting a butterfly valve 4 described later is provided on the cover 2.

  Next, the cutting process of the existing water pipe 1 will be described with reference to FIGS. 6 (a) and 6 (b). The connection port 10 a can be opened and closed above the connection port 10 a of the housing 10. An on-off valve 30 that can maintain water tightness inside the housing 10 is provided. Subsequently, a perforation blade 32a having an inner diameter and a height larger than the outer diameter of the existing water pipe 1 and disposed downward on the peripheral edge of the lower end, and having the same central axis as the perforation blade 32a, from the perforation blade 32a An inner hollow cylindrical drilling cutter 32 having a center drill 32b disposed downward at a lower position and a hook 32c provided at the front of the center drill 32b is used in the cutting process. 31 (work case) is provided in the interior space, and is arranged at a position where the central axis of the cylindrical piercing cutter 32 faces in a substantially vertical direction and intersects with the central axis of the existing water pipe 1 in the casing 10 in a substantially orthogonal direction. As shown, the body 31 is connected in a watertight manner above the on-off valve 30.

  Next, the punching cutter 32 is moved by the stroke 33 that the punching blade 32a moves forward and backward so as to pass through the entire cross section of the existing water pipe 1 while the on-off valve 30 is opened and the drilling cutter 32 is rotated. Move down. By rotating and lowering the drilling cutter 32, the existing water pipe 1 is cut at two places between the diameters of the lower peripheral edge of the drilling cutter 32, and downward from the outer peripheral surface of the upper surface of the existing water pipe 1. The existing water pipe 1 is cut at the two cut surfaces at the point where the perforated blade 32a is lowered so as to pass through the entire cross section of the existing water pipe 1, and is cut between the two cut surfaces. Thus, the pipe piece 1 ′ is separated from the existing water pipe 1.

  In the above-described cutting operation of the existing water pipe 1, the existing water pipe 1 is in an undisrupted water state, and therefore, the existing water pipe 1 is filled with water pressure, and in the cutting operation by the drilling cutter 32, the center drill 32 b When the fluid reaches the inside of the existing water pipe 1 from the outer peripheral surface of the upper surface of the existing water pipe 1, the fluid inside the existing water pipe 1 leaks out of the pipe, and the fuselage is connected to the inner space and the upper side of the housing 10. 31 will be filled. However, since the inside of the body 31 is watertight, as shown in FIG. 1A, the fluid leaked from the inside of the existing water pipe 1 does not leak to the outside of the housing 10 and the body 31. Therefore, the cutting operation can be performed while the fluid in the existing water pipe 1 remains in an undisrupted water state.

  Further, the upstream side port 13a and the downstream side port 13b and the outside of the housing 10 are communicated with each other by a discharge path (not shown), and the cutting operation is performed by cutting chips generated when the existing water pipe 1 is cut. It is performed while discharging to the outside.

  Next, after the cutting operation of the existing water pipe 1, the perforating cutter 32 and the cut pipe piece 1 ′ hooked on the hook piece 32 c of the center drill 32 b are pulled up into the body 31, and the on-off valve 30 is opened. After being in the closed state, it is carried outside (FIG. 6B).

  Subsequently, in the inside of the housing 10, chips generated from the cut surface of the existing water pipe 1 when cutting the existing water pipe 1 and remaining in the housing 10 without being discharged from the upstream side port 13a and the downstream side port 13b. Is discharged from the connection port 10a by a discharge device (not shown) to keep the on-off valve 30 closed.

  Next, the installation process of the butterfly valve 4 will be described. As shown in FIG. 4A, the pipe piece 1 ′ and the casing 10 after the chips are discharged are used in the installation process. The work cylinder 9 (work case) is connected in a state where the connection port 9a and the connection port 10a of the housing 10 are in watertight communication. Inside the work cylinder 9, a cover 2 and a butterfly valve 4 integrally connected by bolts 27 are disposed, and the cover 2 and the butterfly valve 4 are further connected via an insertion rod 35. Is connected to an insertion machine 34 provided at the top of the.

  In the present embodiment, the work case is used in the step of cutting the existing water pipe 1 and the work tube 9 that is used in the step of installing the butterfly valve 4 and has the on-off valve 30 and connected to the housing 10. Similarly, a body 31 connected to the housing 10 is shown.

  Next, after opening the on-off valve 30, the cover 2 and the butterfly valve 4 are pressed from the upper side to the lower side of the work cylinder 9 by the insertion machine 34, as shown in FIG. 4B. It is installed at a predetermined location inside the housing 10.

  When the on-off valve 30 is opened, the fluid in the housing 10 fills the inside of the work cylinder 9. However, since the inside of the work cylinder 9 is watertight, the fluid leaked from the inside of the existing water pipe 1 does not leak to the outside of the work cylinder 9 as shown in FIG. Therefore, the butterfly valve 4 can be installed while the fluid in the existing water pipe 1 remains in an undisturbed state.

  By doing so, the cover 2 capable of water-tightly covering the reduction gear 28 is attached to the upper surface of the upper lid 5 of the butterfly valve 4 in advance, and the reduction gear 28 is previously applied to the upper surface of the upper lid 5 in the work cylinder 9. Since the butterfly valve 4 can be installed with the cover installed, the cover 2 prevents the fluid flowing in from the existing flow path from entering, and the speed reduction gear 28 can be protected during installation.

  Moreover, since the reduction gear 28 is previously attached to the upper lid 5 and covered with the watertight cover 2, fluid intrusion can be prevented when the butterfly valve 4 is installed. In addition to ensuring the lubricity of the 28 gear portions 28a, it is possible to protect the lubricant adhering to the gear portion 28a from being mixed into the existing flow path.

  Further, when the butterfly valve 4 is pressed by the insertion machine 34, the guide roller 3 comes into contact with the inner surface of the work cylinder 9 so as to guide the butterfly valve 4 to a predetermined location inside the housing 10 while rotating. It has become.

  Further, the inside of the vicinity of the connection port 10a of the casing 10 which is a predetermined installation location of the butterfly valve 4 is able to come into contact with a sealing material 8a provided along the peripheral surface of the upper lid 5 of the butterfly valve 4. A step portion 19 is provided. Similarly, a side surface step portion 15 and a bottom surface step portion 16 are provided so as to be able to come into contact with the sealing material 8b provided along the peripheral surface of the partition wall 6 of the butterfly valve 4. On both sides, guide pieces 20 and 20 are provided in the vertical direction so that the partition wall 6 descending downward can be guided to a predetermined installation location.

  Then, substantially simultaneously with the butterfly valve 4 being installed at a predetermined location inside the housing 10, the sealing material 8 a provided on the peripheral surface of the upper lid 5 is provided with a step portion 19 provided on the inner surface of the housing 10. By contacting, the upper lid 5 closes the vicinity of the connection port 10a of the housing 10, and the inside of the housing 10 is sealed. Similarly, the seal material 8b provided along the peripheral surface of the partition wall 6 abuts on the side surface step portion 15 and the bottom surface step portion 16, thereby blocking the flow of fluid inside the housing 10 on the peripheral surface of the partition wall 6. Is done.

  At the installation position of the butterfly valve 4, the fixed plug screw 23 is screwed from the outer surface of the housing 10, so that the distal end portion of the fixed plug screw 23 faces the center of the housing 10 while sliding on the upper surface of the upper lid 5. Therefore, the butterfly valve 4 can be fixed in a state where it is pressed downward.

  Therefore, since the sealing material 8b provided on the side surface and the bottom surface of the partition wall 6 is evenly loaded downward, water tightness can be ensured.

  In this way, after the butterfly valve 4 is installed, even when the partition wall 6 facing the flowing fluid receives a fluid force inside the housing 10, the butterfly valve 4 is disposed at a position sandwiching the partition wall 6 from both the front and back sides. The provided guide pieces 20, 20 receive the fluid force and securely fix and hold the butterfly valve 4.

  Therefore, the valve body 7 is opened and closed by operating an operation shaft 29 described later, and the fluid shut-off state or flow-down state can be operated as shown in FIGS. 1 (c) and 1 (d).

  Then, as shown in FIG. 5, after draining the fluid remaining in the work cylinder 9, the work cylinder 9 and the insertion machine 34 are removed, the bolts 27 are removed, and the cover 2 is removed from the upper lid 5. For removal work or the like, it is possible to enter and exit the inside of the work cylinder 9 from an openable / closable work port 9b provided on the side of the work cylinder 9.

  In this way, the cover 2 capable of watertightly covering the reduction gear 28 is attached to the upper surface of the upper lid 5 of the butterfly valve 4 in advance, and the work cylinder 9 and the housing 10 that are watertightly sealed are attached. Since the butterfly valve 4 can be installed with the reduction gear 28 previously attached to the upper surface of the upper lid 5, the installation process is shortened without requiring the operation of installing the reduction gear 28 again after the butterfly valve 4 is installed. Can be

  Moreover, by doing in this way, the sealing case sealed when installing the butterfly valve 4 is composed of the work cylinder and the housing 10 which are connected in a detachable manner, and a predetermined excision point is inside the housing 10. By being provided, the work cylinder 9 can be removed together with the cover 2 after the inside of the housing 10 is sealed in a watertight manner, so that the structure of the apparatus after the butterfly valve 4 is installed is simplified. 2 and the work cylinder 9 can be reused.

  Then, after the butterfly valve 4 is installed as described above and the work cylinder 9 and the cover 2 are removed, the operation shaft 29 that protrudes to the outside of the casing 10 whose inside is sealed watertight is rotated. Thus, the valve body 7 inside the housing 10 can be opened and closed from the outside of the housing 10.

  By doing in this way, the sealed case is composed of the work cylinder 9 and the housing 10 that are connected in a severable manner, and after the inside of the housing 10 is sealed by the upper lid 5 in the vicinity of the housing 10, By removing the working cylinder 9, the casing 10 that is left behind by sealing the existing water pipe 1 can be miniaturized, so that the casing 10 can be easily sealed to the existing water pipe 1.

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

  For example, in the above embodiment, the butterfly valve 4 is formed as a gate valve. However, if the gate valve has a valve body capable of opening and closing an existing flow path, the butterfly valve 4 is not necessarily required. 10 may be a sluice valve having a sluice valve body that can be opened and closed by sliding movement with respect to a partition wall installed in the interior. There may be.

  Moreover, in the said Example, although the work case is divided and used for the objective by the work cylinder 9 used at the installation process of the butterfly valve 4 and the trunk | drum 31 used at the cutting process of the existing water pipe 1, The case may be the same work case from the cutting process of the existing water pipe 1 to the installation process of the butterfly valve 4.

  Moreover, in the said Example, although the sealing case consisted of the work case (work cylinder 9 and the trunk | drum 31) connected so that division | segmentation was possible, and the housing | casing 10, a sealing case is not limited to such a structure. In particular, a sealed case having no divided structure may be used.

  In the above embodiment, the pipe fluid of the existing water pipe 1 is clean water, but the pipe fluid may be sewage or gas.

  Moreover, in the said Example, although the cutting | disconnection means of the existing water pipe 1 in the inside of the housing | casing 10 was the inner hollow cylindrical drilling cutter 32, the existing water pipe 1 was removed in an undisturbed water state in the sealed case. If cutting is possible, the cutting means is not limited to the punching cutter 32.

It is a top view which shows the whole image of piping which attached the housing | casing provided with the gate valve in the existing water pipe in the Example of this invention. (A) is the top view which showed the state with which the existing water pipe was mounted | worn, and the flow direction of the fluid in a pipe | tube, (b) is the top view which similarly showed the state which cut | disconnected the existing water pipe, (c) FIG. 5 is a plan view showing an open state of a butterfly valve that is also installed inside the housing, and FIG. 6D is a plan view showing a closed state of the butterfly valve. (A) is a perspective view which shows the butterfly valve in this invention, (b) is a perspective view which shows the whole image of a housing | casing. (A) is the longitudinal cross-sectional view which showed the whole cover, (b) is AA sectional drawing of (a). (A) is the longitudinal cross-sectional view which showed the condition where a butterfly valve is installed, (b) is the longitudinal cross-sectional view which showed the condition where it was similarly installed. It is the longitudinal cross-sectional view which showed the condition of the housing | casing in which the butterfly valve was installed. (A) is the figure which showed the cutting condition of the existing water pipe, (b) is the figure which showed the condition of pipe piece removal similarly.

Explanation of symbols

1 Existing water pipe (existing fluid pipe)
2 Cover 3 Guide roller 4 Butterfly valve (gate valve)
5 Upper lid 6 Partition wall 7 Valve body 8a, 8b, 8c Sealing material 9 Work cylinder (work case)
9a connection port 9b work port 10 housing 10a connection port 11 upper housing 12 lower housing 17 flange 19 step portion 23 fixed plug screw 24 cover body 25 annular member 26 connection portion 27 bolt 28 reduction gear (power transmission means)
28a Gear part 29 Operation shaft 30 On-off valve 31 Body (work case)
32 Punching cutter 33 Stroke 34 Inserting machine (insertion means)
35 Insertion rod 36 Roller shaft 40 Open / close shaft E Specific area S Hollow interior

Claims (5)

A partition composed of at least a top lid and a valve body operable by power transmission means by sealing a part of an existing fluid pipe in a sealing case in a watertight manner, excising a predetermined excision portion of the existing fluid pipe in an indefinite water state At the same time as installing the valve at the predetermined excision location by the insertion means that can push the inside of the sealing case, the valve body side inside the sealing case is sealed watertight by the upper lid, A method for installing an uninterrupted water gate valve of an existing fluid pipe that forms a block or a flow path,
On the upper surface of the upper lid, the power transmission means and a cover capable of watertightly covering the power transmission means are attached in advance, and after the valve body side is watertightly sealed by the upper lid, A continuous water gate valve installation method for an existing fluid pipe, characterized in that it is removed.   The sealing case includes a work case having an on-off valve that can be divided and connected to each other via a connection port and can open and close the inside of the sealing case, and the predetermined excision point in the case. 2. The existing fluid pipe according to claim 1, wherein the cover and the work case are removed after the inside of the housing is watertightly sealed with the upper lid in the vicinity of the connection port of the housing. How to install a continuous water gate valve. A partition composed of at least a top lid and a valve body operable by power transmission means by sealing a part of an existing fluid pipe in a sealing case in a watertight manner, excising a predetermined excision portion of the existing fluid pipe in an indefinite water state A valve is installed at the predetermined excision location by an insertion means that can push the inside of the sealing case, and the continuous fluid gate valve installation device for an existing fluid pipe that forms a flow path blocking or flow path,
When the gate valve is installed, the upper lid seals the valve body side inside the sealing case in a watertight manner, and the upper surface of the upper lid can be covered with the power transmission means and the power transmission means in a watertight manner in advance. A non-continuous water gate valve installation device for an existing fluid pipe, wherein a cover that is detachable from the upper lid is attached.   The sealing case includes a work case having an on-off valve that can be divided and connected to each other via a connection port and can open and close the inside of the sealing case, and the predetermined excision point in the case. The existing water gate valve installation device for an existing fluid pipe according to claim 3 provided. The apparatus for installing a continuous water gate valve for an existing fluid pipe according to claim 3 or 4, wherein the power transmission means is a gear reduction means.

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