JP4708947B2 - Flange joint leakage prevention method and apparatus - Google Patents

Description

  The present invention relates to a flange joint water leakage prevention method for preventing water leakage in the flange joint by sealing the flange joint of an existing pipe connected via an existing packing in a watertight manner in the circumferential direction, and to prevent the water leakage. The present invention relates to a flange joint leakage prevention device used.

  A conventional flange joint water leakage prevention method and apparatus thereof include a method for preventing leakage of existing pipes in an indefinite water state when the flange joint, which was initially waterproofed by the existing packing, has deteriorated due to long-term use, etc. An apparatus used for preventing water leakage, the apparatus being formed on a flange surface, a water leakage preventing material formed on the ring body, an inner surface holding the outer surface of the water leakage preventing material along the circumferential direction, and a flange surface Engaging members that are respectively engaged with the plurality of insertion holes that are watertightly sealed, and the water leakage preventing material and the holding material are mounted on the outer surface of the flange joint along the circumferential direction, The insertion hole on the flange surface is sealed in a watertight manner with an engagement material to prevent leakage of the flange joint (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 11-351468 (2nd page, FIG. 4)

  However, in Patent Document 1, in a situation where the flange joint leaks, the leakage preventing material and the holding material are mounted on the outer surface of the flange joint along the circumferential direction, and the insertion hole of the flange surface is formed by the engaging material. In order to engage, it is necessary to attach or engage with the existing pipe while resisting the fluid pressure and the hydraulic head pressure, which requires labor and time.

  The present invention has been made paying attention to such problems, and a flange joint leakage prevention method and apparatus capable of sealing the flange joint without resisting the fluid pressure and water head pressure in the existing pipe leaking from the flange joint. The purpose is to provide.

In order to solve the above-described problem, the flange joint leakage prevention method according to claim 1 of the present invention seals the flange joint of an existing pipe connected via an existing packing in a watertight manner in the circumferential direction. A flange joint water leakage prevention method for preventing water leakage in the flange joint,
A water leakage preventing material formed in a ring body having a belt shape and having substantially the same diameter as the outer diameter of the flange joint by abutting the contact surfaces formed at both ends, and holding the water leakage preventing material The material is watertightly attached to the outer surface of the flange joint along the circumferential direction, and after watertightly sealing with an engaging material that respectively engages a plurality of insertion holes formed on the flange surface, A water draining means having at least a communication path having a smaller diameter than the insertion hole and capable of opening and closing communication between the inside and the outside of the joint portion outside the existing packing of the flange joint is closed. It is said.
According to this feature, the water leakage prevention material and the holding material are attached, and after the insertion hole is sealed with the engagement material, the draining means is closed, so that the fluid pressure and the water head pressure in the existing pipe are reduced. The flange joint can be sealed without resisting, and after the sealing, the communication path having a smaller diameter than the insertion hole can be closed with a small force.

The flange joint water leakage prevention method according to claim 2 of the present invention is the flange joint water leakage prevention method according to claim 1, wherein the communication path is at least one identification member identified among the engagement members. It is characterized by being formed into a composite material.
According to this feature, since the water draining means is formed in the specific engagement material in advance, the flange joint does not require processing of the communication path for water draining.

According to a third aspect of the present invention, there is provided the flange joint leakage preventing device according to the present invention, wherein the flange joint is watertightly attached to the flange joint of the existing pipe connected through the existing packing in the circumferential direction, and prevents water leakage in the flange joint. A joint leakage prevention device,
A ring-shaped ring body having substantially the same diameter as the outer diameter of the flange joint is formed by abutting the abutting surfaces formed at both ends, and is watertight over the outer surface of the flange joint in the circumferential direction. A water leakage preventive material that contacts the outer surface of the water leak preventive material, and a retaining material that holds the outer surface of the water leak preventive material along the circumferential direction. Material, and
The at least one specific engaging material specified among the engaging materials has a smaller diameter than the insertion hole and communicates the inside and the outside of the joint portion outside the existing packing of the flange joint. A water draining means is formed, comprising a passage and a communication passage stopper capable of opening and closing the communication passage from the outside of the joining portion.
According to this feature, the communication passage is opened, and the specific engagement material is engaged while discharging the fluid in the existing pipe to the outside of the flange joint, so that the fluid pressure and the hydraulic head pressure in the existing pipe are not resisted. After the engagement, the communication path having a smaller diameter than the insertion hole can be closed by the communication path plug with a small force. In addition, by engaging the specific engagement material last, when other engagement material is engaged, the fluid pressure in the existing pipe is not loaded, and the communication passage and the communication passage plug are unnecessary, and general-purpose products are used. it can.

The flange joint leakage prevention device according to claim 4 of the present invention is the flange joint leakage prevention device according to claim 3, wherein the specific engagement material is inserted into the insertion hole of the flange joint. It consists of bolts and nuts.
According to this feature, the specific engagement member is formed of the special bolt and nut that is inserted into the insertion hole of the flange joint, and therefore can be easily engaged by screwing.

A flange joint water leakage prevention device according to claim 5 of the present invention is the flange joint water leakage prevention device according to claim 3 or 4, wherein the specific engagement is formed with the communication passage and the communication passage stopper. A material is characterized by being engaged with the insertion hole formed in the upper part of the flange joint.
According to this feature, by engaging the specific engagement material inserted through the insertion hole formed in the upper part of the flange joint, the hydraulic head pressure in the existing pipe is hardly loaded at the time of the engagement, and a smaller force is obtained. It can be made into a closed state by a communication passage stopper.

The flange joint water leakage prevention device according to claim 6 of the present invention is the flange joint water leakage prevention device according to any one of claims 3 to 5, wherein the holding material holds the water leakage prevention material. , Having a divided structure that is divided into a plurality of portions in the circumferential direction in which the end portions are close to or in contact with each other, and holds the end portions between the inner surface of the holding material and the outer surface of the water leakage preventing material It is characterized by plates being installed.
According to this feature, the end portions of the holding material having a divided structure are close to or in contact with each other, and even if there is a place where the holding material does not stably hold the water leakage preventing material in the vicinity of the end portion, The water leakage prevention material in the part which is not hold | maintained by the holding plate is stably hold | maintained, and waterproofness is maintained over the circumferential direction.

A flange joint water leakage prevention device according to claim 7 of the present invention is the flange joint water leakage prevention device according to any one of claims 3 to 6, wherein an inner surface of the holding member includes the pipe shaft. It forms in the visual recessed part along the circumferential direction, The said water leak prevention material is fitted along the circumferential direction by the said recessed part, It is characterized by the above-mentioned.
According to this feature, since the water leakage preventing material is fitted in the recess formed in the inner surface of the holding material along the circumferential direction, even if the holding material presses the water leakage preventing material toward the center of the tube axis. The flange joint is waterproofed in the circumferential direction without the water leakage prevention material coming off from the flange joint in the pipe axis direction.

The flange joint water leakage prevention device according to claim 8 of the present invention is the flange joint water leakage prevention device according to any one of claims 3 to 7, wherein the water leakage prevention material is connected to a joint portion of the flange joint. A first water leakage preventing material that is in watertight contact with the circumferential direction; and a second water leakage preventing material that covers the first water leakage preventing material and is in watertight contact with the outer peripheral surface of the flange joint over the circumferential direction. It is characterized by comprising.
According to this feature, the water leakage preventing material is composed of the first water leakage preventing material and the second water leakage preventing material, and the flange joint is double waterproofed, so that the water tightness of the flange joint is further increased.

  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 (a) is a front view showing an overall image of a flange joint leakage preventing device in an embodiment of the present invention, and (b) is a side view of the same. It is. 2A is a cross-sectional view taken along the line AA in FIG. 1A, and FIG. 2B is an enlarged cross-sectional view of the dotted line enclosing portion E in FIG. Fig.3 (a) is a pipe-axis view which shows the whole 2nd water leak preventing material wound around the flange joint, (b) is BB sectional drawing of (a). FIG. 4A is an enlarged cross-sectional view of the dotted line enclosing portion D of FIG. 1B, and FIG. 4B is an enlarged cross-sectional view of the dotted line enclosing portion D showing a situation where the special bolt nut is similarly screwed. is there. FIG. 5 is an enlarged cross-sectional view showing a situation in which a special bolt nut is screwed in a modified example of the present invention.

  First, as shown in FIGS. 1 (a) and 1 (b) in the present embodiment, the flange joint water leakage prevention device of the present invention is a fluid valve 1 that constitutes a pipe member of an existing water pipe, for example. In the flange joint 3 that connects the straight pipe 2 and the straight pipe 2, it is used as a member that prevents water leakage due to deterioration of the piping.

  Further, the flange joint leakage preventing device of the present embodiment is mounted as described later in an existing water pipe without changing the existing flange joint 3 itself which is a water leak point and without changing the existing pipe line. Regardless of the piping situation in the extending direction around the flange joint 3, the flange joint 3 can be mounted from the outside.

  Next, the flange joint 3 according to the present embodiment will be described. As shown in FIGS. 2A and 2B, the fluid valve 1 and the straight pipe 2 which are formed to have substantially the same inner diameter face each other. The flange joint 3 is joined by an existing bolt and nut (not shown) inserted and screwed into the insertion hole 3b on the flange surface via the existing packing 4 of the ring body.

  When the existing flange joint 3 is used over a long period of time, the existing packing 4 may deteriorate or corrode, and the fluid in the pipe may leak. In such a case, the deterioration of the existing packing 4 and the identification of the corrosion location may be difficult, and local water leakage prevention work may be difficult, and it is necessary to seal the flange joint 3 in a watertight manner. is there. Moreover, the fluid in the pipe | tube in a present Example is a water supply, and it is necessary to implement this water leakage prevention operation | work in a non-continuous water state so that it may mention later.

  Next, the outline of the flange joint water leakage prevention device will be described. As shown in FIGS. 3A and 3B, the flange joint water leakage prevention device of the present embodiment has a band shape and is formed at both ends. As shown in FIGS. 1 and 2, the water leakage preventing materials 8 and 9 formed in the ring body by contacting the contact surfaces as described later, and the water leakage preventing materials 8 and 9 along the circumferential direction, as shown in FIGS. The holding material 10 to hold | maintain and the watertight bolt nut 5 and the special bolt nut 6 which are screwed together by the insertion hole 3b formed in the flange surface as mentioned later are comprised.

  Next, the procedure of the flange joint water leakage prevention method will be described.

  First, as shown in FIGS. 3 (a) and 3 (b), the water leakage preventing materials 8 and 9, which are band-shaped rubber bodies, are wound while making water tight contact with the outer peripheral surface of the flange joint 3, The contact surfaces formed at both ends of the water leakage preventing materials 8 and 9 are brought into contact with each other.

  Further, the water leakage prevention material of this embodiment is a flange joint that covers the first water leakage prevention material 8 and the first water leakage prevention material 8 that are in watertight contact with the joint portion 3a of the flange joint 3 in the circumferential direction. 3 and the 2nd water leak prevention material 9 which contact | abuts watertightly over the outer peripheral surface and the circumferential direction. By doing in this way, in order to doubly waterproof the outer peripheral surface of the flange joint 3, the water tightness of the flange joint 3 increases more.

  Further, as shown in FIG. 3B, the cross section of the first water leakage preventing material 8 is substantially circular in an uncompressed state, and the inner surface of the second water leakage preventing material 9 has a concave portion 9b and a concave portion 9b. Protrusions 9c and 9c are formed on both sides, and the first water leakage preventing material 8 is fitted in the recess 9b.

  Furthermore, the contact surface 9a of the second water leakage preventing material 9 in the wound state has an inclined surface inclined with respect to the tube axis c so as to increase the area. Since the area of the contact surface 9a can be secured sufficiently large, the second water leakage preventing material 9 can be formed in a thin strip shape while maintaining the water tightness of the contact surface 9a.

  Next, the attachment of the holding material 10 will be described. As shown in FIGS. 1A and 1B, the holding materials 10 and 10 have a plurality of divided structures (two divisions in this embodiment) in the circumferential direction. The inner surface is formed in a sectional view recessed portion 10a including the tube axis c along the circumferential direction, and the second water leakage preventing material 9 is fitted in the recessed portion 10a along the circumferential direction. The holding members 10 and 10 are pressed from the outside of the flange joint 3 toward the tube axis c. After the pressing, the holding members 10 and 10 are tightened so as to be close to each other by the stoppers 11 and 11 provided on the outer surfaces of the end portions of the holding members 10 and 10 of the divided structure.

  By doing in this way, since the 2nd water leakage preventive material 9 is fitted in the recessed part 10a formed in the inner surface of the holding material 10 along the circumferential direction, the holding material 10 makes the 2nd water leak preventing material 9 The flange joint 3 is waterproofed in the circumferential direction without the second water leakage preventing material 9 being detached from the flange joint 3 in the direction of the pipe axis c even when pressed toward the center of the pipe axis c.

  In addition, due to the pressing of the holding material 10, the first water leakage preventing material 8 whose cross section is substantially circular in the non-compressed state as described above is the joint portion between the concave portion 9 b of the second water leakage preventing material 9 and the flange joint 3. It is pressed at a gap with 3a and seals the seam 3a in a watertight manner in the circumferential direction.

  Furthermore, the in-pipe fluid leaked from the existing packing 4 to the joint portion 3 a of the flange joint 3 is stopped by the convex portions 9 c and 9 c of the second water leakage preventing material 9, and watertight inside the second water leakage preventing material 9. Sealed.

  Further, as shown in FIGS. 1A and 1B, holding plates 13 and 13 made of thin metal are respectively attached in advance to inner surfaces of both end portions of one holding member 10 having a divided structure. It has been. By pressing each holding material 10 toward the pipe axis c, the end portions of the holding materials 10 and 10 facing each other between the inner surfaces of the holding materials 10 and 10 and the outer surface of the second water leakage preventing material 9 are pressed. It will be in the state where the holding plates 13 and 13 which straddle are constructed.

  By doing in this way, in the state where the second water leakage preventing material 9 is held by the holding materials 10, 10, the ends of the holding materials 10, 10 are close to or in contact with each other, and are held near the ends. Even if there is a place where the materials 10 and 10 do not stably hold the second water leakage prevention material 9, the second water leakage prevention material 9 at the place where the material is not held by the holding plates 13 and 13 is stably held. The waterproofness is maintained over the circumferential direction.

  Moreover, the holding plates 13 and 13 are previously attached to the inner surface at one end of the holding member 10 or 10 having the divided structure, and in this way, the holding member 10 or 10 having the divided structure is attached. By combining the ends of each other, the holding plates 13 and 13 can be smoothly installed across the ends.

  Further, the holding members 10 and 10 are provided with a pinching bolt 12 which is a pinching portion of the present invention and clamps the flange joint 3 from both upstream and downstream sides in the pipe axis c direction. After the second water leakage preventing material 9 is fitted from the outside along the circumferential direction with the materials 10 and 10, the holding materials 10 and 10 are connected to the tube shaft by screwing the pinching bolts 12 toward the flange surface. Positioned in the c direction, the outer peripheral surface of the flange joint 3 is stably waterproofed.

  Next, on the outside of the existing packing 4 of the flange joint 3, the existing bolts and nuts (not shown) inserted and screwed into the plurality of insertion holes 3b formed in the circumferential direction are removed, and the present invention is newly developed. A plurality of watertight bolt nuts 5 which are engaging materials are sequentially screwed into the insertion holes 3b, and the flange joint 3 is joined.

  As shown in FIG. 2 (b), the watertight bolt nut 5 has a washer 5c in which an O-ring 5d is disposed on the head side of the bolt 5a. A cap nut 5b provided with an O-ring 5e is screwed. By doing so, the insertion holes 3b are sealed on both the upstream and downstream sides of the flange surface, and the fluid in the pipe is prevented from flowing out of the sealed insertion holes 3b.

  Next, after a plurality of watertight bolt nuts 5 are screwed into the insertion holes 3b, finally, as shown in FIG. 1 and FIG. 4 (a), one special bolt nut which is a specific engagement material of the present invention. 6 is engaged with an insertion hole 3 b formed in the upper part of the flange joint 3.

  The special bolt nut 6 is a draining means of the present invention, comprising a small hole 6g formed on the end face of the head of the bolt 6a, and small holes 6h, 6h formed on the side peripheral surface substantially at the center of the lower part of the neck. However, a communication path 6f having a smaller diameter than the insertion hole 3b communicating with the inside of the bolt 6a is formed in advance, and the communication path 6f can be screwed into the small hole 6g by the communication path plug 7 and can be opened and closed. . In addition, the specifications of the cap nut 6b and the O-rings 6d and 6e constituting the special bolt nut 6 are the same as those of the watertight bolt nut 5.

  As shown in FIG. 4B, the above-described special bolt nut 6 is screwed in with the communication path 6f open, so that the fluid in the existing pipe is transferred to the existing packing 4 of the flange joint 3 at the time of screwing. The flange surface is sealed in a watertight manner while flowing into the communication passage 6f from the small holes 6h and 6h located inside the joining portion 3a on the outside and being discharged to the outside of the flange joint 3 (see the white arrow in the figure). Engage. By doing in this way, it can engage, without resisting the fluid pressure and water head pressure in an existing pipe.

  Further, the above-described communication passage 6f, which is the draining means of the present invention, is formed in the special bolt nut 6 which is a special engagement material. No processing of the communication path is required.

  Furthermore, since the specific engagement material of the present invention includes the special bolt nut 6 inserted into the insertion hole 3b of the flange joint 3, it is easy to engage by screwing.

  After the engagement of the special bolt nut 6 described above, the communication path 6f through which the fluid in the existing pipe flows out is closed by the communication path plug 7 in the small hole 6h. By doing in this way, the communicating path 6f with a diameter smaller than the insertion hole 3b can be closed by the communicating path plug 7 with a small force. Further, by engaging the special bolt nut 6 last, the fluid pressure in the existing pipe is hardly loaded when the other watertight bolt nut 5 is engaged, and the communication passage 6f and the communication passage plug 7 are unnecessary. General-purpose products can be used.

  Further, the special bolt nut 6 of this embodiment is engaged with the insertion hole 3b formed in the upper portion of the flange joint 3, and in this way, the hydraulic head pressure in the existing pipe is loaded during the engagement. Instead, the communication path 6f can be closed by the communication path plug 7 in the small hole 6h with a smaller force.

  In this embodiment, first, the water leakage preventing materials 8 and 9 and the holding material 10 are attached to the outer surface of the flange joint 3 along the circumferential direction, and then the watertight bolt nut 5 is watertightly inserted into the insertion hole 3b. Finally, the special bolt nut 6 is engaged, and the communication passage 6f is closed by the communication passage plug 7. The flange joint leakage prevention method according to the present invention is finally a communication passage which is a draining means. As long as 6f is in the closed state, the engagement order of the other members is not necessarily limited to the present embodiment. For example, first, the watertight bolt nut 5 is engaged with the insertion hole 3b. Similarly, the communication passage 6f is opened and the special bolt nut 6 is engaged with the insertion hole 3b. The holding material 10 may be attached to the outer surface of the flange joint 3 along the circumferential direction, and finally the communication path 6f of the special bolt nut 6 may be closed by the communication path plug 7.

  In this way, the water leakage prevention materials 8 and 9 and the holding material 10 are attached to the flange joint 3 and the insertion hole 3b is sealed with the watertight bolt nut 5 and the special bolt nut 6, and then the water of the present invention is used. By closing the extraction means, the flange joint 3 can be sealed without resisting the fluid pressure and head pressure in the existing pipe, and after the sealing, the communication path 6f having a smaller diameter than the insertion hole 3b is closed with a small force. State.

  Further, as shown in FIG. 5 as a modification of the present invention, the small diameter 6g ′ of the special bolt nut 6 ′ may be formed on the outer peripheral surface of the neck lower part in the vicinity of the head of the bolt 6a ′. Thus, in the process of screwing the bolt 6a ′ and the nut 6b, the fluid in the existing pipe can be drained. Further, by doing so, the communication path 6f 'can be closed by tightening the bolt 6a', and the communication path plug as described above is not necessary.

  Further, although not particularly shown as a modified example of the present invention, a concave groove may be formed as a communication path of the modified example on the outer peripheral surface of the bolt neck lower part of the special bolt nut toward the bolt axis direction. By doing so, in the same manner as described above, in the process of screwing the bolt and the nut, the fluid in the existing pipe can be discharged to the outside of the flange joint through the concave groove and drained. By tightening, the groove (communication path) can be closed, and a communication path plug is not required.

  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 special bolt nut 6 having the communication path 6f is provided only one of the plurality of watertight bolt nuts 5, but the special bolt nut 6 that is the specific engagement material of the present invention is As long as there is at least one, the number is not limited to one, and a plurality may be provided.

  In the above embodiment, the special bolt nut 6 as the specific engagement material is provided with the communication passage 6f as the water draining means. However, the water draining means of the present invention has a smaller diameter than the insertion hole 3b and has a flange. There may be a passage that allows the inside and the outside of the joint portion 3 a outside the existing packing 4 of the joint 3 to be openable and closable. For example, a through passage that penetrates the flange surface of the flange joint 3 may be formed.

  Moreover, in the said Example, although the special volt | bolt nut 6 which has the communication path 6f is engaged with the insertion hole 3b formed in the upper part among the plurality of insertion holes 3b formed in a flange surface, The special bolt nut 6 which is a specific engagement material may be engaged with any insertion hole 3b on the flange surface.

  Moreover, in the said Example, a water leak prevention material is comprised from the 1st water leak prevention material 8 contact | abutted with the joining part 3a of the flange joint 3, and the 2nd water leak prevention material 9 which coat | covers the 1st water leak prevention material 8. However, as long as the water leakage preventing material of the present invention seals the flange joint 3 in a watertight manner in the circumferential direction, the constituent member may be a single member.

  Furthermore, in the said Example, although the inner surface of the holding | maintenance material 10 is formed along the circumferential direction in the cross-sectional recessed part 10a, and the water leak prevention material is fitted along the circumferential direction to the recessed part 10a, Even if the material 10 presses the water leakage prevention material toward the center of the pipe axis c, the water leakage prevention material is not detached from the flange joint in the direction of the pipe axis c, and is retained if the flange joint is waterproof along the circumferential direction. The shape of the inner surface of the material 10 may not be particularly formed in the recess 10a.

  Further, in the above embodiment, the holding plate 13 is installed between the inner surfaces of the holding materials 10 and 10 and the outer surface of the second water leakage preventing material 9 so as to straddle the ends of the holding materials 10 and 10 having a divided structure. However, for example, if the end portions of the holding members 10 and 10 are in contact with each other and the flange joint is sealed in a watertight manner in the circumferential direction, the holding plate 13 is not particularly required.

  Furthermore, in the said Example, although the holding materials 10 and 10 are provided with the clamping bolt 12 which is the clamping part of this invention which clamps the flange joint 3 to the pipe-axis c direction, As long as it is positioned toward the tube axis c and the flange joint 3 is stably waterproofed, it is not necessary to provide the clamping portion.

  Moreover, in the said Example, although the pipe | tube fluid of the existing pipe | tube of this invention is a clean water, the pipe | tube fluid of an existing pipe | tube may be a sewage or gas, for example.

(A) is a front view which shows the whole image of the flange joint water leakage prevention apparatus in the Example of this invention, (b) is a side view similarly. (A) is AA sectional drawing of Fig.1 (a), (b) is an expanded sectional view of the dotted line enclosure part E of FIG.1 (b). (A) is a pipe-axis view which shows the whole 2nd water leak prevention material wound around the flange joint, (b) is BB sectional drawing of (a). (A) is an expanded sectional view of dotted line enclosing part D of Drawing 1 (b), and (b) is an enlarged sectional view of dotted line enclosing part D which showed the situation where a special bolt nut is similarly screwed together. It is an expanded sectional view showing the situation where the special bolt nut in the modification of the present invention is screwed together.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid valve 2 Straight pipe 3 Flange joint 3a Joint part 3b Insertion hole 4 Existing packing 5 Watertight bolt nut (engagement material)
5a Bolt 5b Cap nut 5c Washer 5d, 5e O-ring 6, 6 'Special bolt nut (specific engagement material)
6a, 6a ′ bolt 6b cap nut 6d, 6e O-ring 6f, 6f ′ communication path 6g, 6g ′ small hole 6h small hole 7 communication path plug 8 first water leakage preventing material 9 second water leakage preventing material 9a contact surface 9b concave portion 9c Convex part 10 Holding material 10a Concave part 11 Stopper 12 Clamping bolt 13 Holding plate c Pipe shaft

Claims (8)

A flange joint water leakage prevention method for sealing a flange joint of an existing pipe connected through an existing packing in a watertight manner in the circumferential direction to prevent water leakage in the flange joint,
A water leakage preventing material formed in a ring body having a belt shape and having substantially the same diameter as the outer diameter of the flange joint by abutting the contact surfaces formed at both ends, and holding the water leakage preventing material The material is watertightly attached to the outer surface of the flange joint along the circumferential direction, and after watertightly sealing with an engaging material that respectively engages a plurality of insertion holes formed on the flange surface, A water draining means having at least a communication path having a smaller diameter than the insertion hole and capable of opening and closing communication between the inside and the outside of the joint portion outside the existing packing of the flange joint is closed. And flange joint water leakage prevention method.   The flange joint water leakage preventing method according to claim 1, wherein the communication path is formed in at least one specific engagement material specified among the engagement materials. A flange joint leakage preventing device that is watertightly attached to a flange joint of an existing pipe connected via an existing packing over the circumferential direction and prevents water leakage in the flange joint,
A ring-shaped ring body having substantially the same diameter as the outer diameter of the flange joint is formed by abutting the abutting surfaces formed at both ends, and is watertight over the outer surface of the flange joint in the circumferential direction. A water leakage preventive material that contacts the outer surface of the water leak preventive material, and a retaining material that holds the outer surface of the water leak preventive material along the circumferential direction. Material, and
The at least one specific engaging material specified among the engaging materials has a smaller diameter than the insertion hole and communicates the inside and the outside of the joint portion outside the existing packing of the flange joint. A flange joint water leakage preventing device, comprising: a drainage means including a passage and a communication passage stopper capable of opening and closing the communication passage from the outside of the joining portion.   The flange joint water leakage preventing device according to claim 3, wherein the specific engagement material is a special bolt and nut inserted into the insertion hole of the flange joint.   The flange joint water leakage prevention according to claim 3 or 4, wherein the specific engagement member in which the communication passage and the communication passage stopper are formed is engaged with the insertion hole formed in an upper portion of the flange joint. apparatus.   In the state where the holding material holds the water leakage preventing material, the holding material has a divided structure that is divided into a plurality of portions in the circumferential direction in which the end portions approach or contact each other, and the inner surface of the holding material and the water leakage preventing material The flange joint water leakage preventing device according to any one of claims 3 to 5, wherein a holding plate straddling the end portions of each other is provided between the outer surface and the outer surface.   The inner surface of the holding material is formed along a circumferential direction in a cross-sectional recess including the tube axis, and the water leakage preventing material is fitted in the recess along the circumferential direction. 6. The flange joint leakage preventing device according to any one of claims 6 to 10.   The water leakage preventing material is in contact with the joint portion of the flange joint in a watertight manner over the circumferential direction, and the water leakage preventing material covers the first water leakage preventing material to cover the outer circumferential surface of the flange joint and the circumferential direction. The flange joint water leakage prevention device according to any one of claims 3 to 7, further comprising a second water leakage prevention material that is in watertight contact with each other.

Images