JP4494178B2 - Channel opening / closing device for existing fluid pipes - Google Patents

Description

  The present invention relates to a flow path opening / closing device for an existing fluid pipe that can open and close an existing fluid pipe such as a water and sewage pipe or a gas pipe without temporarily blocking the flow of an internal fluid.

  A conventional flow path opening / closing device for an existing fluid pipe is configured such that the casing is watertightly attached to the outer peripheral surface of the existing fluid pipe, the existing fluid pipe inside the casing is cut, and then the valve body between the cut surfaces of the existing fluid pipe Etc. are installed (for example, refer to Patent Document 1).

Japanese Utility Model Publication No. 5-4635 (first page, Fig. 2)

  However, in Patent Document 1, when the valve body is installed between the cut surfaces of the existing fluid pipe after the existing fluid pipe is cut, when the valve body is lowered from the upper side toward the installation position, Since the sealing material provided on both side surfaces of the valve body is deformed by sliding contact with the inner side surface of the housing, there is a problem that the sealing effect of the valve body cannot be maintained at the installation position.

  The present invention has been made paying attention to such problems, and when the valve main body is installed between the cut surfaces of the existing fluid pipe after the existing fluid pipe is cut, the valve main body is set to the installation position from above. An object of the present invention is to maintain a sealing effect and prevent fluid leakage at the installation position of the valve body without causing deformation of the seal material disposed on both side surfaces of the valve body when the valve body is moved downward. And

In order to solve the above-described problem, a flow path opening / closing device for an existing fluid pipe according to claim 1 of the present invention provides:
The outer peripheral surface of the existing fluid pipe is sealed with a casing capable of securing at least the existing flow path, and the existing fluid pipe is cut in an indefinite water state, and the existing flow path is provided inside the casing having at least a bottom surface and a side surface. Is a flow path opening and closing device for an existing fluid pipe that installs a valve body that can be opened and closed at a predetermined installation position,
The valve main body includes a partition wall having an opening and a valve seat provided at a periphery of the opening, and a valve body capable of opening and closing the opening. The peripheral surface of the partition wall includes at least both side surfaces and a bottom surface. The partition wall has a narrow taper shape from the upper part to the lower part, and the seal material provided on both side surfaces of the partition wall on the inner side surface of the housing abuts. The contact surface is formed so as to become narrower from the upper part to the lower part inside the casing so as to correspond to the change in the width dimension of the partition wall, and on the inner side surface of the casing. It is formed as a thick side step,
On the bottom surface of the housing, which is the position where the valve body is installed, a contact surface on which the sealing material on the bottom surface of the partition wall contacts in a watertight manner is formed as a thick bottom step on the bottom surface of the housing. , Has a structure continuous with the side step,
The valve main body is a butterfly valve in which the valve body is rotatable about an opening / closing shaft, and a seal material is formed in an annular shape on a lower surface of a bearing portion of the opening / closing shaft provided at a lower portion of the partition wall. And a part of the bottom stepped portion has a wide portion so as to receive the annularly formed sealing material .
According to this feature, when the valve body is installed, the sealing material provided on both side surfaces of the partition wall is hardly compressed by sliding contact with the inner side surface of the housing during the lowering operation of the valve body. In the installation position, the seal material provided on both side surfaces of the partition wall contacts the inner surface of the housing almost simultaneously, so that fluid leakage due to deformation of the seal material can be prevented.
In addition, the contact surface that contacts both side surfaces of the partition wall can be secured only by processing and forming the side surface step part and surface treatment of the side surface step part, so that the inner surface of the housing is compared with the contact surface of the sealing material. Process formation is simple and inexpensive.
In addition, since thick step portions are formed on the inner side surface and the inner bottom surface of the housing, the dimensions and shape of the valve body necessary for blocking the flow path in the pipe are compared with those of the housing having no step portion. Since the valve body can be kept small, the valve body can be reduced in size and weight, and the installation work of the valve body is simplified.
Furthermore, not only the stability is improved at the installation position of the butterfly valve, but the sealing performance is improved because the wide portion is sealed with a plurality of strips.

The flow path opening / closing apparatus for an existing fluid pipe according to claim 2 of the present invention is the flow path opening / closing apparatus for an existing fluid pipe according to claim 1 , wherein the casing is divided into at least two parts in the vertical direction. It is a structure which can form the said side step part which continues in an up-down direction by joining the division | segmentation surface of the said housing | casing by the welding process from the outer peripheral surface side.
According to this feature, when the post-weld deformation that occurs in the butt portion at the side surface step portion is polished, the position of the polishing portion can be easily identified by the step portion of the side surface step portion, and the thickness step is increased. Since it is formed as a part, it is possible to secure a polishing margin.

The flow path opening / closing device for an existing fluid pipe according to claim 3 of the present invention is the flow path opening / closing apparatus for an existing fluid pipe according to claim 1 or 2 , wherein the bottom surface of the partition wall is provided with the bottom surface. The fitting piece which clamps a step part protrudes in the downward direction, It is characterized by the above-mentioned.
According to this feature, at the installation position of the valve body, the fitting pieces provided on both the front and back sides of the partition wall are fitted to the bottom stepped portion, so that the valve body is subjected to pressure fluctuations or the like generated when the valve body is opened and closed. The load can be received and the movement of the valve body can be prevented.

A flow path opening / closing apparatus for an existing fluid pipe according to claim 4 of the present invention is the flow path opening / closing apparatus for an existing fluid pipe according to any one of claims 1 to 3 , wherein at least a peripheral surface of the partition wall is provided. A sealing material integrally provided with a convex R surface is provided on the bottom surface and both side surfaces, and the bottom surface of the housing and the side surface step portion are integrally continuous with the concave R surface.
According to this feature, at the position where the valve body is installed inside the housing, the sealing surface integrally connected to the bottom surface and both side surfaces of the partition wall by the convex R surface, and the bottom surface and the side step portion of the housing are integrated. The load that is applied to the sealing material on the bottom surface of the partition wall that has received a downward pressing force is then gradually applied to the sealing material on both side surfaces via the R surface. Therefore, it is possible to prevent the sealing material on the bottom surface from being deformed in the lateral direction and maintain the sealing effect on the contact surface.

The flow path opening / closing apparatus for an existing fluid pipe according to claim 5 of the present invention is the flow path opening / closing apparatus for an existing fluid pipe according to any one of claims 1 to 4 , wherein the installation is performed on the casing. An upstream communication port formed on the upstream side of the valve body at the position; a downstream communication port formed on the downstream side of the valve body at the installation position; the upstream communication port and the downstream communication port; And a communication passage opening / closing valve capable of opening and closing the communication passage.
According to this feature, by opening the communication passage opening / closing valve, the upstream side and the downstream side of the valve body in the housing are communicated with each other, and the pressure difference is reduced, so that the valve body is smoothly opened and closed. be able to.

  Examples of the present invention will be described below.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 channel opening / closing device 2 is mounted on an existing water pipe 1 in a first embodiment of the present invention. (A) is the top view which showed the state which attached the flow-path opening / closing apparatus 2 to the existing water pipe 1, and the flow direction of the fluid in a pipe, (b) showed the state which cut | disconnected the existing water pipe 1 similarly. It is a top view, (c) is the top view which showed the open state of the butterfly valve 4 similarly installed in the flow-path opening-and-closing apparatus 2, (d) showed the closed state of the butterfly valve 4 similarly. It is a top view. 2A is a perspective view showing the open state of the butterfly valve 4 in the present invention, FIG. 2B is a perspective view showing the closed state, and FIG. 2C is an overall view of the housing 10. It is a perspective view. FIG. 3 is a perspective view of the butterfly valve 4 as viewed obliquely from below. FIG. 4 is a plan view showing the housing 10. 5 is a cross-sectional view taken along line ff of FIG. 4, showing the side step 15 and the bottom step 16 provided integrally and continuously on the inner side and the inner bottom of the housing 10. FIG. 6A is a longitudinal sectional view of the casing 10 at a midpoint where the butterfly valve 4 is lowered from above the casing 10 toward the installation position, and FIG. It is a longitudinal cross-sectional view of the housing | casing 10 in the point installed in the installation position.
7 is an enlarged cross-sectional view taken along the lines aa and bb in FIG. 4, showing a butt portion for joining the upper housing 11 and the lower housing 12 which are divided into upper and lower parts by welding. It is the expanded sectional view which showed the butt | matching part before a process, (b) is the expanded sectional view which similarly showed after welding processing, (c) is the expanded sectional view which also showed after grinding processing. FIG. 8A is a sectional view taken along the line dd in the housing 10, and FIG. 8B is a sectional view taken along the line dd showing the state in which the butterfly valve 4 is also installed. FIG. 9 is a schematic view showing a piercing cutter 32 for cutting the existing water pipe 1 inside the flow path opening / closing device 2. FIG. 10 is a schematic view showing an insertion machine 34 for installing the butterfly valve 4 inside the flow path opening / closing device 2. FIG. 11A is a cross-sectional view taken along the line ee of FIG. 6B in a state where the butterfly valve 4 is installed inside the flow path opening / closing device 2, and FIG. 11B is a modification of FIG. FIG. 12 is a longitudinal sectional view showing the flow path opening / closing device 2a in which the bottom surface of the casing 10a is formed in a plane in the first modification of the present invention. FIG. 13 is a longitudinal sectional view showing a housing 10b in which a concave portion 15b is formed in a side step portion 15 ′ in a second modification of the present invention. FIG. 14 is a cross-sectional view taken along the line gg of FIG. 13, where (a) is a view showing a state in which the sealing material 81b is deformed and is in contact with the contact surface 15a, and (b) is a seal after (a). It is a figure of the state which the material 81b contact | abutted normally.

  As shown in FIG. 1 (a), the piping state after mounting the flow path opening / closing device 2 in the first embodiment of the present invention is, for example, with respect to the flow direction of the fluid in the existing water pipe 1 which is a water pipe, The flow path opening / closing device 2 comprising the housing 10 in the first embodiment of the present invention is connected to 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. Attached to the outer peripheral surface in a water-tight manner, the existing water pipe 1 part inside the housing 10 is cut (FIG. 1 (b)), and a butterfly valve 4 (gate valve) is attached to the cut portion, FIG. 1 (c), As shown to (d), it has the structure which can open and close the existing flow path of the existing water pipe 1. As shown in FIG.

  By arranging the flow path opening / closing device 2 as described above, 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 the pipe portion located in the specific area E is removed or repaired. Is possible.

  As shown in FIGS. 2 and 8 (b), the outer shape of the flow path opening / closing device 2 according to the first embodiment of the present invention is composed of a butterfly valve 4 and a housing 10 that change the flow path of an existing water pipe, The housing 10 can be divided into two upper and lower parts including an upper housing 11 and a lower housing 12. The casing 10 is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the existing water pipe 1. A circular upper opening U that opens upward is formed on the upper surface, and a horizontal opening is also formed on the side surface. Two circular side openings A and A ′ are formed.

  As shown in FIGS. 2 and 4, the inner diameters of the side opening A and the side opening A ′ having the same central axis C in the horizontal direction and facing each other on the side surface of the housing 10 are as follows: The outer diameter of the existing water pipe 1 is substantially the same or slightly larger, and a watertight seal material 8c is provided on the inner surface in the vicinity of both end portions of the side openings A and A ′.

  Reinforcing ribs 14 are provided on the outer surface of the upper housing 11 and the lower housing 12 and on the outer bottom surface of the housing 12. An upstream port 13 a that can be opened and closed is provided on the upstream side of the butterfly valve 4. Similarly, a downstream port 13 b that can be opened and closed is provided on the downstream side of the butterfly valve 4. 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.

  The attachment of the flow path opening / closing device 2 to the existing water pipe 1 will be described with reference to FIG. 2C. The upper housing 11 and the lower housing 12 are respectively connected to the central axis C from above and below the existing water pipe. Attach to the outer periphery of the existing water pipe at a position that matches the central axis of the existing water pipe. A butt portion of the upper housing 11 and the upper housing 12 attached to the outer peripheral portion of the existing water pipe is formed with a groove portion 18 for welding, and as will be described later with reference to FIG. The upper housing 11 and the lower housing 12 are joined by welding from the outer surface of the lower housing 12. Moreover, the outer periphery of the housing | casing 10 and the existing water pipe 1 is inserted in the opening part A and opening part A 'between the flange 17 by the side of the housing | casing 10, and the pushing ring | wheel 17' of a division structure in the opening part A '. Join the surface.

  The inside of the housing 10 becomes watertight by joining the upper housing 11 and the lower housing 12 by welding, and joining the both ends of the opening A and the opening A ′ and the outer peripheral surface of the existing water pipe. Yes.

  Next, the work process will be described with reference to FIGS. 2C, 9, and 10. In the flow path opening / closing device 2, the upper opening U can be opened and closed freely in the upper opening U, and the flow is opened in the closed state. An on-off valve 30 that can maintain the water tightness inside the road opening / closing device 2 is disposed, and the on-off valve 30 after the disposition is kept closed. 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 provided in the inner space of the body 31. The body 31 is opened and closed so that the central axis of the cylindrical piercing cutter 32 is substantially vertically oriented and intersects the central axis of the existing water pipe 1 in the housing 10 in a direction substantially perpendicular to the central axis. A watertight communication connection is made above 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 gradually cut downward from the outer peripheral surface of the upper surface of the existing water pipe 1 at two cut surfaces between the diameters of the bottom edge of the drilling cutter 32. The existing water pipe 1 is cut at two cut surfaces at a point where the perforated blade 32a is lowered so as to pass through the entire cross section of the existing water pipe 1, and the existing water pipe is cut between the two cut surfaces. The piece 1 ′ is cut off 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, as shown in FIG. 1A, the fluid leaking from the existing water pipe 1 does not leak to the outside of the flow path opening / closing device 2. Therefore, the cutting operation can be performed while the fluid in the existing water pipe 1 remains in an undisrupted 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, in the flow path opening / closing device 2, after the cutting operation of the existing water pipe 1, the existing cutter pipe 32 after cutting that is hooked on the hooking piece 32c of the center drill 32b and the punch 32b provided inside the trunk 31 is provided. The piece 1 'is carried out to the outside.

  Subsequently, inside the flow path opening / closing device 2, the existing water pipe 1 is generated from the cut surface of the existing water pipe 1 when it is cut, and remains in the housing 10 without being discharged from the upstream side port 13a and the downstream side port 13b. The chips are discharged from the upper opening U by a discharge device (not shown).

  Next, in the flow path opening / closing device 2 after discharging the existing water pipe piece 1 ′ and the chips, as shown in FIG. 10, the body 31 ′ having the butterfly valve 4 and the insertion machine 34 disposed therein is opened / closed. Then, the on-off valve 30 is opened and the butterfly valve 4 is pressed downward from above by the insertion machine 34.

  Here, as shown in FIGS. 2 (a) and 2 (b), the butterfly valve 4 can be opened / closed by rotating around a partition wall 6 having an opening H in the substantially central portion and an opening / closing shaft 40. And a circular upper cover portion 5 provided in the horizontal direction integrally connected to the upper end portion of the partition wall 6.

  An opening / closing shaft 40 extending in the vertical direction is provided at the center of the left and right sides of the valve body 7, and as shown in FIG. 3, the lower end portion of the opening / closing shaft 40 extending downward from the lower peripheral edge of the valve body 7. Is inserted 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 and inserted into the upper bearing portion 41a and pivotally supported.

  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 the valve body 7 is closed (see FIG. 2 (b), the entire periphery of the valve body 7 is in close contact with the valve seat portion 42 made of a seal member, so that the fluid in the pipe flows through the opening H.

  The flow path opening / closing device 2 after the butterfly valve 4 is installed in the housing 10 is provided with an opening / closing shaft rotating means (not shown) so that the valve body 7 can be opened and closed.

  A sealing material 8 a provided on the peripheral surface of the upper lid portion 5 is formed so as to be in watertight pressure contact with a step portion 19 provided on the inner side surface of the housing 10. Similarly, a sealing material 8b including a sealing material 81b provided on both side surfaces of the partition wall 6 and a sealing material 82b provided on the bottom surface is provided on the inner side surface of the housing 10 at the installation position of the butterfly valve 4. The side surface step portion 15 and the bottom surface step portion 16 in which a part of the bottom surface of the housing 10 bulges are formed in a watertight manner.

  The diameter of the opening H is formed substantially the same as the diameter of the existing water pipe 1, and the center of the opening H is located at a position where the butterfly valve 4 is installed on the bottom step 16 formed in the housing 10 in advance. Almost overlaps the central axis of the existing water pipe 1.

  Therefore, when the opening H of the butterfly valve 4 is open (FIG. 2A), the existing flow path passes from the upstream side through the opening H having substantially the same diameter from the cut surface of the existing water pipe 1 to the downstream side. Therefore, the fluid in the existing water pipe 1 flows through the opening H of the butterfly valve 4 with almost no turbulence.

  When the butterfly valve 4 is provided in the flow path opening / closing device 2, the pipe path of the water pipe is as shown in FIG. 1C, and the fluid in the existing water pipe 1 is passed through the butterfly valve in the flow path opening / closing apparatus 2. When the valve body 7 is closed, the specific area E is not flowed down. When the valve body 7 is open, the specific area E is flowed down. Therefore, by closing the valve body 7 of the butterfly valve 4, it is possible to remove or repair the pipe portion located in the specific area E.

  Next, each part of the flow path opening / closing device 2 will be described in detail.

  In the flow path opening / closing device 2 at the installation position of the butterfly valve 4, as shown in FIG. 5, the contact surface with the bottom surface of the partition wall 6 is formed in the thick bottom surface step portion 16, so that When cutting the existing water pipe 1 with the cutter 32, the chips generated and dropped from the cut surface of the existing water pipe 1 and adhering to the contact surface of the bottom step 16 flow down inside the existing water pipe 1. Because the water flow or the turbulent water flow generated by the rotating operation of the cylindrical perforating cutter 32 oscillates irregularly near the inner bottom surface of the housing 10 and falls from the contact surface of the bottom step 16. When the butterfly valve 4 is installed, the sealing material 82b provided on the bottom surface of the partition wall 6 is pressed by the bottom surface step portion 16 without interposing the cutting powder, so that the sealing performance can be improved. As shown in FIG. 4, since the width dimension of the upper surface of the bottom surface step portion 16 is suppressed to a narrow size necessary to correspond to the width size of the sealing material 82b, the upper surface of the bottom surface step portion 16 is It becomes difficult for the chips to adhere to the surface.

  Further, as shown in FIG. 6A, a sealing material 8b including sealing materials 81b and 82b integrally connected to both side surfaces and a bottom surface of the partition wall 6 by a convex R surface is provided. Also on the inner surface, the side surface step portion 15 and the bottom surface step portion 16 are integrally formed to be continuous with a concave R surface.

  Accordingly, as shown in FIG. 6B, at the position where the butterfly valve 4 is installed inside the casing 10, the lower end corners of the partition wall 6 and the both ends of the bottom step 16 of the casing 10 are in contact with each other. Since the contact surfaces coincide with each other on the corresponding R surfaces, when the butterfly valve 4 is installed inside the housing 10, the load applied to the bottom sealing material 82b can be gradually applied to the sealing materials 81b on both sides. It becomes possible, the horizontal deformation of the sealing material 82b on the bottom surface can be prevented, and the sealing effect on the contact surface can be maintained.

  Further, as shown in FIG. 3, an annular sealing material 82 b ′ is formed on the peripheral surface of the partition wall 6 on the lower surface of the lower bearing portion 41 b bulging in a cylindrical shape at the lower part of the partition wall 6. It is provided integrally with the sealing materials 81b and 82b. Moreover, the planar view center part of the bottom face step part 16 is formed in the wide part 16a so that the sealing material 82b formed in cyclic | annular form may be received (FIG. 5).

  Therefore, a part of the bottom surface step portion 16 is formed in the wide portion 16a corresponding to the partition wall 6 having the lower bearing portion 41 bulging in a cylindrical shape. In particular, the stability around the opening / closing shaft 40 of the partition wall 6 having a large pressure fluctuation is increased.

  In addition, since a plurality of strips (annular) sealing material 82b 'is in contact with the wide portion 16a and sealed on the lower surface of the lower bearing portion 41b, the chips generated when the existing water pipe 1 is cut as described above are wide portion 16a. Even if it remains in the case, it is possible to prevent a decrease in the sealing performance due to the sandwiching of the chips.

  Furthermore, in the present embodiment, the lower end portion of the opening / closing shaft 40 is exposed on the bottom surface of the partition wall 6, and the annular sealing material 82 b ′ is formed so as to surround the exposed lower end portion of the opening / closing shaft 40. As shown in FIG. 6B, the periphery of the lower end of the opening / closing shaft 40 is sealed, so that the valve body 7 can be smoothly rotated.

  Further, as shown in FIG. 6A, the partition wall 6 has a narrow taper shape from the upper part to the lower part, and the inner side surface of the housing 10 corresponds to a change in the width dimension of the partition wall 6. As described above, the side surface step portion 15 inside the housing 10 is formed so as to become narrower from the upper part to the lower part.

  Therefore, when the butterfly valve 4 is installed, the sealing material 81 b provided on both side surfaces of the partition wall 6 is almost compressed by sliding contact with the inner side surface of the housing 10 during the lowering operation of the butterfly valve 4. In the installation position, the sealing material 8b provided on both side surfaces and the bottom surface of the partition wall 6 contacts the inner surface of the housing 10 almost simultaneously, so that fluid leakage due to deformation of the sealing material 8b can be prevented.

  Further, as shown in FIG. 6B, when the butterfly valve 4 is installed inside the housing 10, the sealing material 8b provided on both side surfaces and the bottom surface of the partition wall 6 and the inner surface of the housing 10 are in contact with each other. After the contact, the load applied to the sealing material 82b on the bottom surface of the partition wall 6 that receives the downward pressing force can be gradually applied to the sealing material 81b on both side surfaces via the R surfaces at both ends of the bottom surface. Therefore, it is possible to prevent lateral deformation of the bottom sealing material 82b and maintain the sealing effect on the contact surface.

  Further, since both side surfaces of the partition wall 6 are tapered in front view, the weight of the butterfly valve 4 is the sealing material on the bottom surface of the partition wall 6 at the installation position in the housing 10 of the butterfly valve 4. Since the pressing force is evenly applied not only to 82b but also to the sealing material 81b provided on both side surfaces and deformation of the bottom sealing material 82b can be suppressed, the sealing effect can be further increased.

  Further, as shown in FIG. 5, the contact surface of the partition wall 6 on the inner surface of the housing 10 is formed as a thick side step 15 on the slightly inward side of the other inner surfaces. As a result, as compared with the case in which the inner surface of the housing 10 is used as the contact surface of the sealing material 8b described above, the contact surface that contacts the both side surfaces of the partition wall 6 can be secured only by processing the side step portion 15. Process formation is simple and inexpensive.

  Moreover, since the contact surface with the partition wall 6 on the inner side surface and inner bottom surface of the housing 10 forms the side surface step portion 15 and the bottom surface step portion 16 on the inner side of the housing 10, the outer periphery of the existing water pipe Inside the casing 10 larger than the surface, the size and shape of the butterfly valve 4 can be kept small, and the labor for installing the butterfly valve 4 can be reduced.

  Further, as shown in FIG. 2 (c), the flow path opening / closing device 2 of the present invention has a structure that is divided into upper and lower parts at a substantially central height. Explained. The housing 10 has a structure in which the upper housing 11 and the lower housing 12 are joined by welding from the outer surface side. As shown in FIG. 7A, the upper housing 11 and the lower housing 12 are joined. The butt portion with the body 12 has a groove portion 18 on the outer surface.

  As shown in FIG. 7B, a part of the melted and solidified welding material is formed as a build-up portion on the inner side surface of the casing 10 by welding from the outer side surface of the casing 10. Therefore, in order to maintain the above-described sealing effect, in order to smooth the contact surface with the partition wall 6 on the inner side surface of the housing 10, the contact portion with the partition wall (polishing portion) of the build-up portion. K) is subjected to a surface treatment by polishing.

  In the case of joining by conventional welding, since there is no side step portion inside the housing, the location of contact between the partition wall and the inside surface of the housing cannot be specified, and the polishing location cannot be limited. Therefore, there is a problem that a wide surface must be polished in advance, and the casing body must be thick in order to secure a polishing margin.

  In the case of the present embodiment, only the contact surface with the partition wall 6 on the inner side surface of the housing 10 is formed on the thick side surface step portion 15, so that as shown in FIG. It is easy to specify the position of the contact point (polishing point K) with the wall, and since it is formed as a thick side step 15 on the inner surface, a polishing margin can be secured. Therefore, it is not necessary to polish a wide surface, and it is not necessary to make the casing 10 main body thick.

  Further, as shown in FIGS. 6 and 8, the guide piece 20 is provided at two positions on the inner surface of the housing 10, with the butterfly valve 4 being installed, on the upper and lower sides sandwiching the partition wall 6 from the front and the back. 21, 20 ′, 21 ′ are fixed. As shown in FIG. 6A, the guide pieces 21 and 21 ′ and the guide pieces 20 and 20 ′ (not shown) guide the butterfly valve 4 while being in sliding contact with the wall surface of the partition wall 6. Displacement of the abutment position between the side surface of the partition wall 6 and the abutment surface of the side surface step portion 15 that occurs when moving downward from the position toward the installation position in the housing 10 can be prevented, and under the influence of water pressure or the like in the pipe However, the installation work of the butterfly valve 4 is facilitated.

  Further, the pair of front and back guide pieces 20 and 21 of the partition wall 6 fixed to the upper part in the casing 10 face each other substantially in parallel. Similarly, the guide pieces 20 'and 21' fixed to the lower part in the casing 10 are also mutually connected. It is formed to face almost parallel. Further, the upper end portions 24 and 24 ′ of the pair of guide pieces 20 and 21 and the guide pieces 20 ′ and 21 ′ are formed with notches that are expanded upward, so that FIG. As shown, when the butterfly valve 4 continues to descend along the guide pieces 20, 20 ′, 21, 21 ′ toward the predetermined installation position, the bottom end of the partition wall 6 is positioned at the upper end of the guide piece. Guided between the pair of front and back guide pieces 20, 21 and 20 ', 21' without projecting against the parts 24, 24 ', and the butterfly valve 4 does not tilt, as shown in FIG. 6 (b). Installed accurately at the installation position.

  Therefore, when the fluid in the existing pipe flows down through the communication pipe 7, the butterfly valve 4 is less likely to be subjected to a load such as vibration due to the influence of turbulence or the like. Can be maintained for a long time.

  A state in which the butterfly valve 4 is installed at a predetermined position inside the housing 10 is shown in FIG. 6B, and the sealing material 8 a provided on the side peripheral surface of the upper lid portion 5 of the partition wall 6 and the inside of the housing 10 The step portion 19 provided on the side surface is in close water-tight contact, and similarly, the sealing material 8b provided on the side peripheral surface of the partition wall 6 and the side step portion 15 provided on the inner side surface and the inner bottom surface of the housing 10. Since the bottom surface step portion 16 is in close water-tight manner, the flow of the in-pipe fluid from the upstream is blocked by the partition wall 6 when the valve body 7 is closed.

  Further, as shown in FIG. 6 and FIG. 11A, fitting pieces 45 project downward from the left and right both ends of the front and back surfaces of the lower end of the partition wall 6 so as to sandwich the partition wall 6 therebetween. The lower end portion 45a of the fitting piece 45 opposed to each other is expanded in a downward opening taper shape. Therefore, when the butterfly valve 4 is installed in the housing 10, the butterfly valve 4 is fitted to the bottom surface step portion 16 without the lower end portion 45 a of the fitting piece 45 projecting from the upper surface of the bottom surface step portion 16. Is done.

  Since the fitting piece 45 is fitted to the bottom step 16 at the installation position of the butterfly valve 4 in the casing 10, the partition wall 6 facing the fluid flow direction receives the load of the fluid flow. Even in this case, the fitting piece 45 can contact the side surface of the bottom surface step portion 16 to receive the load.

  In particular, since the fitting pieces 45 are provided on both the front and back surfaces of the partition wall 6, the sealing performance can be maintained without the butterfly valve 4 fluctuating even when the fluid flow is disturbed or backflowed. .

  Further, as shown in FIGS. 5 and 8B, the fixed plug screw 23 screwed from the outer surface of the housing 10 toward the inner surface is provided on the upper surface of the upper lid 5 at the installation position of the butterfly valve 4. Six locations are arranged at substantially equal intervals in the circumferential direction in the plan view of the housing 10 at the height position where they abut.

  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 is slidably contacted with the upper surface of the upper lid portion 5 and is centered inside the housing 10. Therefore, the butterfly valve 4 can be fixed in a state where the butterfly valve 4 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.

  As described above, after the butterfly valve 4 is installed, even when the partition wall 6 facing the flowing fluid receives a fluid force, the guide pieces 20, 21 disposed at positions sandwiching the partition wall 6 of the butterfly valve 4, 20 'and 21' receive the fluid force and securely hold the butterfly valve 4.

  Further, a pair of front and back guide pieces 20 ′ and 21 ′ are provided below the inner side surface of the housing 10 shown in FIG. 8 so as to sandwich the partition wall 6 shown in FIG. Since these guide pieces 20 ′ and 21 ′ receive a load such as water pressure applied to the partition wall 6, the displacement of the butterfly valve 4 is effectively suppressed.

  Further, in this embodiment, after the butterfly valve 4 is installed, the upstream side port 13a and the downstream side port 13b are communicated with each other by a communication tube 43 (communication channel), and the communication tube that can open and close the communication channel. An on-off valve 44 (communication path on-off valve) is provided. By opening the communication pipe opening / closing valve 44, the upstream side and the downstream side of the butterfly valve 4 are communicated even when the valve body of the butterfly valve 4 installed in the housing 10 is closed.

  Therefore, since the pressure difference between the upstream side and the downstream side of the butterfly valve 4 is reduced by opening the communication pipe opening / closing valve 44, the opening / closing operation is performed even when the valve body 7 is opened / closed in the opened state. It becomes possible to suppress the water hammer phenomenon due to momentary fluctuations in the water pressure, which can prevent the butterfly valve 4 from being loaded or damaged.

  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 not departing from the gist 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 valve body. However, if the valve body 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, or a ball valve having a ball valve body that can be opened and closed by rotation with respect to the partition wall installed in the same manner. There may be.

  Further, in the above embodiment, the side step 15 in the housing 10 is formed so as to become narrower from the top to the bottom, but the side step 15 is not formed, and The inner side surface may be formed so as to become narrower from the upper part to the lower part.

  In the above embodiment, the number of fixed plug screws is six. However, the number is not necessarily limited to these numbers, and any number may be used as long as the purpose of fixing and holding the butterfly valve 4 can be achieved.

  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.

  In the above embodiment, the cutting means for the existing water pipe 1 inside the flow path opening / closing device 2 is the hollow cylindrical drill 32 for cutting, but if the existing water pipe 1 can be cut, the cutting means is for drilling. The cutter 32 is not limited.

  In the above embodiment, as shown in the figure, the pair of front and back guide pieces 20 and 21 of the partition wall 6 are arranged in parallel to each other, and the guide pieces 20 ′ and 21 ′ are also arranged in the same manner. For example, the guide pieces 20 and 21 at the upper part of the housing 10 may be formed in an upwardly open tapered shape. This facilitates the installation work of the butterfly valve 4 in the housing 10.

  Moreover, in the said Example, although the upper surface of the bottom face step part 16 is horizontal as FIG. 11 (a) shows, if a sealing performance can be maintained, for example, as shown in FIG. The upper surface of the part 16 ′ may be arranged in a downward gradient toward the upstream side of the existing water pipe 1. Due to the water flow in the pipe of the existing water pipe 1 and the gradient of the upper surface of the bottom surface step portion 16 ′, the chips are more difficult to adhere to the upper surface of the bottom surface step portion 16 ′.

  Furthermore, in the said Example, as FIG. 11 (a) shows, although the upper surface of the bottom face step part 16 is a plane, if a sealing performance can be maintained, it will not be limited to a plane.

  Furthermore, in the said Example, as FIG. 5 showed, although joining with the upper housing | casing 11 and the lower housing | casing 12 was performed by welding, if a watertightness can be maintained, a joining method will not be restricted to welding. . For example, a flange may be provided at a joint portion of each housing, a sealing material such as rubber packing may be sandwiched between the joint surfaces, and the joints may be joined with bolts, nuts, or the like.

  Moreover, in the said Example, as FIG. 3 shows, although the lower bearing part 41b is exposed to the bottom face of the partition wall 6, the lower bearing part 41b is not exposed to the bottom face of the partition wall 6, It may be sealed below the wall 6.

  In the above embodiment, the sealing material 82b ′ is formed in a circular ring shape, but may be formed in a ring shape such as double or triple as long as it has at least one ring. As long as it is not limited to a circular shape, it may be formed in any ring shape such as a square shape.

  Further, in the above embodiment, as shown in FIG. 4, the wide portion 16 a swells in a circular shape in plan view, but the shape of the wide portion 16 a receives the sealing material 82 b ′ and the sealing material 82 b ′. Any shape that can be contacted may be used.

  In the above embodiment, when the existing water pipe 1 is cut, the upstream side port 13a and the downstream side port 13b are communicated with the outside of the housing 10 by a discharge path (not shown), and after the butterfly valve 4 is installed. The discharge path is removed, and as shown in FIG. 4, a communication pipe 43 and a communication pipe opening / closing valve 44 are disposed between the upstream side port 13a and the downstream side port 13b, and the upstream side port 13a and the downstream side The side port 13b can communicate with each other. However, the discharge path, the communication pipe 43, and the communication pipe on / off valve 44 may be provided in advance to open and close each pipe line.

  Moreover, in the said Example, although the upstream side port 13a and the downstream side port 13b were provided in the housing | casing 10 side surface lower part, if the formation location of the upstream side port 13a and the downstream side port 13b can discharge | emit chips, it is not necessarily these For example, it may be provided on the bottom surface of the housing 10.

  Moreover, in the said Example, as FIG.6 and FIG.11 (a) shows, the fitting piece 45 is arrange | positioned by four right and left both ends of the front and back both surfaces of the partition wall 6, and sandwiches the partition wall 6 between them. The fitting pieces 45 opposed to each other are expanded in a downward opening taper shape, but the formation position, the number or the shape of the fitting pieces 45 are not necessarily limited to these, and the fitting pieces 45 are not limited to those in the casing 10 of the butterfly valve 4. In this installation position, the fitting piece 45 may be fitted to the bottom surface step portion 16 to receive the load applied to the butterfly valve 4.

  In the first embodiment of the present invention, as shown in FIG. 5, the bottom surface of the housing 10 that contacts the sealing material 82 b formed on the bottom surface of the partition wall 6 is formed on the bottom surface step 16. The bottom surface does not necessarily have to be formed on the bottom surface step portion 16, and as shown in FIG. 12 as a first modification of the present invention, the bottom surface of the housing 10a is formed in a flat surface without having the bottom surface step portion. It may be.

  Moreover, in 1st Embodiment of this invention, as shown to Fig.6 (a), although the contact surface with the sealing material 81b of the side surface step part 15 is a plane, the applicable contact surface does not necessarily need to be a plane. There is no. As shown in FIG. 13 as a second modification of the present invention, the contact surface 15a of the side surface step portion 15 ′ has a groove-like recess 15b into which the sealing material 81b can be fitted. You may form in the up-down direction.

  As shown in FIG. 14A, when the partition wall 6 is lowered and installed in the housing 10b, the sealing material 81b may be deformed due to the influence of the fluid flow velocity or pressure.

  Here, when the side stepped portion is a flat surface, the sealing material 81b is in contact with the flat side stepped portion while being deformed by the fluid pressure, and the sealing performance may be lowered to complete the sealing in this state. As shown in FIG. 14B of this modified example, when the concave portion 15b is formed in the side surface step portion 15 ′, the sealing material 81b deformed by the fluid pressure is formed into the concave portion 15b along with the lowering of the partition wall 6. Thus, the sealing material 81b is fitted into the concave portion 15b of the side step portion 15 ′ without deformation at the position where the partition wall 6 is installed.

  In addition, in this modified example, since the shape of the concave portion 15b is arcuate in plan view, the center portion of the sealing material 81b is smoothly introduced into the inner bottom portion of the concave portion 15b as the partition wall 6 is lowered, and a reliable sealing position is obtained. It can be secured.

It is a top view which shows the whole image of piping which attached the flow-path opening / closing apparatus 2 to the existing water pipe 1 in 1st Embodiment of this invention. (A) is the top view which showed the state which attached the flow-path opening / closing apparatus 2 to the existing water pipe 1, and the flow direction of the fluid in a pipe, (b) showed the state which cut | disconnected the existing water pipe 1 similarly. It is a top view, (c) is the top view which showed the open state of the butterfly valve 4 similarly installed in the flow-path opening-and-closing apparatus 2, (d) showed the closed state of the butterfly valve 4 similarly. It is a top view. (A) is a perspective view which shows the open state of the butterfly valve 4 in this invention, (b) is a perspective view which similarly shows a closed state, (c) is a perspective view which shows the whole image of the housing | casing 10. FIG. It is. It is the perspective view which looked at the butterfly valve 4 from diagonally downward. FIG. 3 is a plan view showing the housing 10. FIG. 5 is a cross-sectional view taken along the line ff of FIG. 4, showing a side step 15 and a bottom step 16 provided integrally and continuously on the inner side and the inner bottom of the housing 10. (A) is a longitudinal cross-sectional view of the housing | casing 10 in the middle point in which the butterfly valve 4 descend | falls toward the installation position from the upper direction of the housing | casing 10, (b) is the installation position of the butterfly valve 4 similarly. It is a longitudinal cross-sectional view of the housing | casing 10 in the point installed in. FIG. 5 is an enlarged cross-sectional view taken along the lines aa and bb in FIG. 4 showing a butt portion for joining the upper housing 11 and the lower housing 12 which are divided into upper and lower parts by welding, and (a) is a butt before welding. It is the expanded sectional view which showed the part, (b) is the expanded sectional view which showed the welding process similarly, (c) is the expanded sectional view which showed the polishing process similarly. (A) is dd sectional drawing in the housing | casing 10, (b) is dd sectional drawing which shows the state in which the butterfly valve 4 was similarly installed. It is the schematic which showed the cutter 32 for piercing | punching which cuts the existing water pipe 1 inside the flow-path opening / closing apparatus 2. FIG. It is the schematic which showed the insertion machine 34 which installs the butterfly valve 4 in the flow-path opening / closing apparatus 2. FIG. (A) is ee sectional drawing of FIG.6 (b) in the state in which the butterfly valve 4 was installed in the flow-path opening / closing apparatus 2, (b) is a modification of (a). It is the longitudinal cross-sectional view which showed the flow-path opening / closing apparatus 2a in which the bottom face of the housing | casing 10a in the 1st modification of this invention is formed in a plane. It is the longitudinal cross-sectional view which showed the housing | casing 10b by which the recessed part 15b is formed in the side surface step part 15 'in the 2nd modification of this invention. FIG. 14 is a cross-sectional view taken along the line gg of FIG. 13, in which (a) shows a state in which the sealing material 81 b is deformed and abuts against the abutting surface 15 a, and (b) shows that the sealing material 81 b is normal after (a). It is a figure of the state contact | abutted to.

Explanation of symbols

1 Existing water pipe 2 Channel switch 4 Butterfly valve (valve body)
5 Upper lid part 6 Partition wall 7 Valve element 7a Communication port (existing water pipe side)
7b Communication port (new water pipe side)
8b Seal material (partition wall peripheral surface)
81b Sealing material (partition wall side)
82b Sealing material (bottom of partition wall)
82b 'annular seal material (bearing bottom surface)
10 Housing 11 Upper Housing 12 Lower Housing 13a Upstream port (upstream communication port)
13b Downstream port (downstream communication port)
15 Side step 16 Bottom step 16a Wide portion (bottom step)
19 Steps (for upper lid)
20 Upper guide piece (upstream side)
21 Upper guide piece (downstream)
23 Fixed plug screw 32 Drilling cutter 40 Opening and closing shaft 41a Upper bearing portion 41b Lower bearing portion 42 Valve seat portion 43 Communication pipe (communication passage)
44 Communication pipe open / close valve (communication passage open / close valve)
45 Fitting piece A Side opening (upstream side of existing water pipe)
E Specific area H Opening

Claims (5)

The outer peripheral surface of the existing fluid pipe is sealed with a casing capable of securing at least the existing flow path, and the existing fluid pipe is cut in an indefinite water state, and the existing flow path is provided inside the casing having at least a bottom surface and a side surface. Is a flow path opening and closing device for an existing fluid pipe that installs a valve body that can be opened and closed at a predetermined installation position,
The valve main body includes a partition wall having an opening and a valve seat provided at a periphery of the opening, and a valve body capable of opening and closing the opening. The peripheral surface of the partition wall includes at least both side surfaces and a bottom surface. The partition wall has a narrow taper shape from the upper part to the lower part, and the seal material provided on both side surfaces of the partition wall on the inner side surface of the housing abuts. The contact surface is formed so as to become narrower from the upper part to the lower part inside the casing so as to correspond to the change in the width dimension of the partition wall, and on the inner side surface of the casing. It is formed as a thick side step,
On the bottom surface of the housing, which is the position where the valve body is installed, a contact surface on which the sealing material on the bottom surface of the partition wall contacts in a watertight manner is formed as a thick bottom step on the bottom surface of the housing. , Has a structure continuous with the side step,
The valve main body is a butterfly valve in which the valve body is rotatable about an opening / closing shaft, and a seal material is formed in an annular shape on a lower surface of a bearing portion of the opening / closing shaft provided at a lower portion of the partition wall. A flow path opening / closing device for an existing fluid pipe , wherein a part of the bottom stepped portion has a wide portion so as to receive the annularly formed sealing material . The case has a structure in which the case has at least the upper and lower side stepped portions, and the side stepped portion that is continuous in the up-down direction is formed by joining the divided surfaces of the case by welding from the outer peripheral surface side. The flow path opening and closing device for an existing fluid pipe according to claim 1 , which has a structure that can be formed. 3. The flow path opening / closing device for an existing fluid pipe according to claim 1, wherein a fitting piece for sandwiching the bottom stepped portion projects downward from a lower end portion of the partition wall. A sealing material integrally provided with a convex R surface is provided on at least the bottom surface and both side surfaces of the peripheral surface of the partition wall, and the bottom surface of the housing and the side stepped portion are integrally continuous with the concave R surface. The flow path opening / closing device for an existing fluid pipe according to any one of claims 1 to 3 . The casing has an upstream communication port formed on the upstream side of the valve body at the installation position, a downstream communication port formed on the downstream side of the valve body at the installation position, and the upstream communication The flow path of the existing fluid pipe | tube in any one of the Claims 1 thru | or 4 provided with the communicating path which connects an opening | mouth and the said downstream communication port, and the communicating path on-off valve which can open and close the said communicating path Switchgear.

Images