JP2013096459A - Pipe inner surface repairing band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe inner surface repairing band for preventing diametrically contracting by external force in the inner diameter direction, while maintaining expansive flexibility of an expansion part of a cylinder body member, without requiring complicated work by simplifying a structure member.SOLUTION: This pipe inner surface repairing band includes: the cylinder body member 5 having at least sealing parts 8 and 8' for respectively abutting in a sealing manner on inner surfaces of a spigot pipe 1 and a socket pipe 2, and bellows-shaped expansion parts 9 interposed in the pipe axis direction between the sealing parts 8 and 8', having an expansion margin for following up relative positions or the relative movement of both spigot and socket pipes 1 and 2 and alternately continuously arranging recessed parts formed inside projection parts projected in the outer diameter direction and the projection parts projected in the inner diameter direction for forming the recessed parts outside along the pipe axis direction; and support members 7 selectively fitted in some of the recessed parts out of the plurality of recessed parts formed inside the projection parts projected in the outer diameter direction of the expansion parts and supporting the expansion parts against the external force in the inner diameter direction to a fluid pipe.

Description

  The present invention relates to a pipe inner surface repair band in which a pipe joint in which one fluid pipe and the other fluid pipe are connected is installed in a sealed manner over the inner surfaces of both the fluid pipes in the circumferential direction.

  A conventional pipe inner surface repair band has an annular body (cylinder body member) having a flexible structure having an uneven vertical cross section, and a fixing plate (support member) that pressurizes the annular body and fixes it to the inner wall of the pipe body. A reinforcing plate having convex and concave portions that engage with the concave and convex shape of the annular body is interposed therebetween, and the reinforcing plate is fixed to the inner wall of the pipe body together with the annular body by pressurization of the fixing plate. (For example, refer to Patent Document 1).

JP 2011-179555 A (5th page, FIG. 2)

  However, in Patent Document 1, a reinforcing plate is interposed between the annular body and the fixed plate, and the number of structural members is not only diverse but complicated, and the reinforcing plate has an uneven shape of the annular body. In order to engage the convex and concave portions, the engaging portion between the annular body and the reinforcing plate has a problem that the expansion / contraction flexibility is lost.

  The present invention has been made paying attention to such problems, and by simplifying the structural member, not only complicated work is required, but also the expansion / contraction flexibility of the expansion / contraction part of the cylinder body member is maintained. An object of the present invention is to provide a pipe inner surface repair band that prevents the diameter from being reduced by an external force in the inner diameter direction.

In order to solve the above problems, the pipe inner surface repair band of the present invention is:
In a pipe joint in which one fluid pipe and the other fluid pipe are connected, a pipe inner surface repair band that is erected in a sealed manner over the inner surface of both fluid pipes in the circumferential direction,
Each of the sealing portions that contact the inner surfaces of both the fluid pipes in a sealing manner, and an expansion / contraction allowance interposed between the respective sealing portions in the pipe axis direction to follow the relative position or relative movement of the both fluid pipes. Convex portions formed on the inner side of the convex portion projecting in the outer diameter direction and convex portions projecting in the inner diameter direction formed with the concave portion on the outer side are alternately arranged along the tube axis direction. A cylindrical body member provided with at least a bellows-like stretchable part;
By selectively fitting into any one of the plurality of recesses formed inward of the projections projecting in the outer diameter direction of the telescopic portion, the external force in the inner diameter direction with respect to the fluid pipe And a support member that supports the expansion and contraction portion.
According to this feature, any of the plurality of recesses formed on the inner side of the projecting portion protruding in the outer diameter direction of the expansion / contraction portion of the cylinder body member that follows the relative position or relative movement of the fluid pipes connected to each other. By selectively inserting the support member into the concave portion, even if the expansion and contraction portion in the tube axis direction is used and the expansion / contraction portion having relatively low strength is used, the place where the support member is inserted is Since the diameter can be maintained without being reduced by the external force in the inner diameter direction, not only the flow path in the fluid pipe can be secured, but also the sealed portion has no influence of the external force in the inner diameter direction, and the fluid pipe by the sealed portion Can be kept sealed. In addition, since the support member is fitted in the concave portion formed inward of the convex portion protruding in the outer diameter direction, it does not come off from the expansion / contraction portion that expands and contracts following the fluid pipe. Furthermore, the insertion position of the support member and the number to be used depend on the material of the expansion / contraction part, the number of the plurality of recesses formed inside the protrusion protruding in the outer diameter direction, the outer diameter of the fluid pipe, and the strength of the support member. Since it can set based on this, the pipe inner surface repair band which can respond to various fluid pipes can be provided, leaving expansion allowance.

The pipe inner surface repair band of the present invention is
The cylindrical body member is characterized in that it includes a support portion that is interposed between the sealing portions alongside the expansion / contraction portion and does not have the expansion / contraction allowance.
According to this feature, a support portion having no expansion allowance and having a higher strength than the expansion / contraction portion is interposed between the expansion / contraction portions between the sealing portions. Increases the degree of freedom in designing the strength.

The pipe inner surface repair band of the present invention is
The support member is formed of a ring body capable of expanding in the outer diameter direction.
According to this feature, the ring body is positioned in the selected recessed portion in a reduced diameter state, and then expanded in diameter, thereby making it easy to dispose and replace the support member, and to the inner surface of the fluid pipe of the expansion / contraction section. The acting contact force can be set.

The pipe inner surface repair band of the present invention is
A fixing member is provided on the inner surface of each of the sealing portions so as to seal the sealing portions against the inner surface of the fluid pipe.
According to this feature, since the fixing member is provided on the inner surface of each sealing portion, the sealed state of the fluid pipe by the sealing portion can be stabilized.

It is a sectional side view which shows the pipe inner surface repair band in the Example of this invention. It is a principal part enlarged view which shows the expansion-contraction part and support member in FIG. It is a sectional side view which shows the pipe inner surface repair band in the modification 1 of this invention. (A) is an enlarged view in the area | region of A of FIG. 3, (b) is a partially expanded view of the expansion-contraction part in the modification 2. FIG.

  EMBODIMENT OF THE INVENTION The form for implementing the pipe | tube inner surface repair band which concerns on this invention is demonstrated below based on an Example.

  The pipe inner surface repair band 4 according to the embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the insertion tube 1 that is one fluid tube and the reception tube 2 that is the other fluid tube in this embodiment are, for example, concrete for waterworks buried in the ground. , A reinforced concrete, asbestos, ductile cast iron, other cast iron, steel, vinyl chloride, polyethylene, polyolefin, etc., and a fluid pipe embedded in the ground. The receiving portion 2a having a diameter larger than that of the other portion of the receiving tube 2 is formed, and the end portion on the tube axis direction side of the inserting tube 1 is an insertion portion that can be inserted into the receiving portion 2a. 1a is formed. When the insertion tube 1 and the reception tube 2 are metal fluid tubes, the insertion tube 1 and the reception tube are provided on the inner peripheral surface 1 b of the insertion tube 1 and the inner peripheral surface 2 b of the reception tube 2. As a rust preventive treatment for preventing rust from the fluid flowing in 2, a coating layer (not shown) is formed of mortar or a rust preventive paint. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, sewage, etc., gas or liquid of gas or gas and liquid It may be a mixture.

  In the present embodiment, the insertion tube 1 and the receiving tube 2 are connected without using a separate member, and a seal member 3 that seals the facing surfaces of both the opening portions 1a and 2a in a watertight manner is provided in the receiving portion 2a. The gap between the circumferential surface and the outer circumferential surface of the insertion portion 1a is pressed and held in the circumferential direction, and the gap is closed in a sealed manner. When the insertion tube 1 and the receiving tube 2 are fluid pipes made of ductile cast iron or the like, a push ring (not shown) is provided on the outer peripheral surface of the insertion tube, and the push nut and the receiving portion are not shown by a bolt nut. As a result of the connection, the seal member 3 may be pressed and held in the circumferential direction in the gap between the two mouth portions, and the gap may be sealed in a sealed manner.

  The insertion tube 1 and the receiving tube 2 are connected to each other by a pipe joint having expansion / contraction flexibility that allows a predetermined length of movement in the tube axis direction (not shown) to be connected. 2a is connected by absorbing movements such as expansion, contraction, and rotation while maintaining sealing performance by the seal member 3. In addition, the insertion tube 1 and the receiving tube 2 that are connected in the above-described manner are both affected by the unequal subsidence of the surrounding ground where these tubes 1 and 2 are embedded. In some cases, the tubes 1 and 2 are connected in a distorted or bent manner.

  Between the insertion tube 1 and the receiving tube 2 connected in this way, the pipe inner surface repair band 4 of the present invention constructed over the insertion portion 1a and the receiving portion 2a is attached. . The pipe inner surface repair band 4 is formed between the sealing portions 8 and 8 ′ and the sealing portions 8 and 8 ′ that are in contact with the inner peripheral surface 1b of the insertion tube 1 and the inner peripheral surface 2b of the receiving tube 2 in a sealing manner. A cylindrical body member having at least an expansion / contraction portion 9 that is provided in the tube axis direction and has an expansion / contraction allowance to follow the existing relative position of the both-end pipes 1 and 2 or the relative movement after the installation of the pipe inner surface repair band 4 5 and is fitted into a part of a plurality of recesses provided on the inner surface of the expansion / contraction part 9 formed in the tube axis direction, and supports the expansion / contraction part 9 against the external force in the inner diameter direction with respect to the both-end pipes 1 and 2. It is mainly comprised from the supporting member 7 which consists of a ring body.

  The pipe inner surface repair band 4 is a fixing band that is a fixing member that abuts the sealing parts 8 and 8 ′ on the inner surfaces 1 b and 2 b of the two-end pipes 1 and 2 in a sealing manner on the inner surfaces of the sealing parts 8 and 8 ′. 6 and 6 'are provided, and are attached in a state of being fixed to both the mouth tubes 1 and 2 by the fixing bands 6 and 6'. Thus, by providing the fixed bands 6 and 6 ′ on the inner surfaces of the sealing portions 8 and 8 ′, the sealed state of the both-end pipes 1 and 2 by the sealing portions 8 and 8 ′ can be stabilized. Details will be described later.

  Each of the fixing band 6 and the support member 7 is formed of a substantially arc-shaped divided member divided into a plurality of circumferential directions (not shown), and is configured in a substantially cylindrical shape by tightening the divided members with bolts or the like. Further, the fixing band 6 and the support member 7 exposed to the fluid in the pipe are made of stainless steel in this embodiment, are not easily rusted, and have higher rigidity than the cylindrical body member 5. Further, the fixing band and the support member may be, for example, a substantially C shape continuous in the circumferential direction and having a diameter expanding means in the radial direction, and not only made of stainless steel but also subjected to rust prevention processing, for example. It may be made of steel or a resin having higher rigidity than the cylindrical body member.

  Next, the cylindrical body member 5 will be described. The cylindrical body member 5 is made of an elastic material such as a rubber material or a synthetic resin material, and is provided with seals provided at both ends of the cylindrical body member 5 in the tube axis direction. The outer peripheral surfaces of the portions 8 and 8 ′ are disposed so as to be in sealing contact with the inner peripheral surfaces 1 b and 2 b of the insertion tube 1 and the receiving tube 2, respectively. More specifically, each sealing portion 8, 8 ′ has lip portions 8 a, 8 a ′ projecting toward the inner peripheral surfaces 1 b, 2 b of both-end pipes 1, 2 at the tip in the tube axis direction, Protrusions 8c and 8c ′ are provided at substantially the center in the direction.

  In this embodiment, the sealing portion 8 is located on the inner peripheral surface 1b on the insertion tube 1 side, and the sealing portion 8 'is located on the inner peripheral surface on the receiving tube 2 side. In addition, although the sealing part of this invention is provided in two places of the both ends of the tube axis direction of the cylinder body member 5, for example, in addition to the above-mentioned sealing parts 8 and 8 ', the tube axis of the cylinder body member 5 is provided. You may provide three or more sealing parts, such as providing the separate sealing part which does not have a lip | rip part also in the center side of a direction. Further, each of the sealing portions 8a and 8a ′ of the present embodiment has two protrusions 8c and 8c ′ in the tube axis direction, but this protrusion may be only one or There may be three or more articles.

  Further, on the inner peripheral surface of the cylindrical body member 5 where the sealing portions 8 and 8 ′ are positioned in the tube axis direction, groove portions 8b and 8b ′ that open toward the inner diameter direction of the two-end tubes 1 and 2 are provided along the circumferential direction. Is formed. The fixing bands 6 and 6 'described above are accommodated in the grooves 8b and 8b', respectively. Furthermore, the fixed bands 6 and 6 'are assembled so as to have an outer diameter slightly larger than the natural inner diameter of the sealing portions 8 and 8' made of an elastic member. As a result, the sealing portions 8 and 8 ′ are expanded in diameter by the fixing bands 6 and 6 ′ and pressed against the inner peripheral surfaces 1 b and 2 b of the both-end pipes 1 and 2. 2b and the outer peripheral surface of the fixed band 6, 6 ', the protrusions 8c, 8c' are elastically deformed, and the connection portion between the inner peripheral surface 1b of the insertion tube 1 and the fixed band 6 is received. The mouth tube 2 is hermetically closed over the connection portion between the inner peripheral surface 2b of the mouth tube 2 and the fixed band 6 '.

  Further, since the lip portions 8a and 8a ′ protrude in the outer diameter direction from the inner peripheral surfaces 1b and 2b of the both-end tubes 1 and 2 in a natural state, the both-end tubes 1 and 2 are arranged depending on the arrangement of the cylindrical body member 5. Since the lip portions 8a and 8a 'are pressed toward the inner peripheral surfaces 1b and 2b by the fluid pressure in the tube, the tube body member 5 is deformed along the inner peripheral surfaces 1b and 2b. Both ends are sealed without gaps.

  As shown in FIG. 2, the cylindrical body member 5 is formed with an expansion / contraction portion 9 having an expansion allowance and a contraction allowance that can expand and contract by a predetermined length in the tube axis direction. A plurality of 8 'are provided at predetermined intervals in the tube axis direction. Moreover, the cylinder body member 5 is provided between the sealing parts 8 and 8 ′ in a line with the expansion / contraction part 9 in the tube axis direction, and includes a support part 10 having no expansion / contraction allowance. Between the sealing portions 8 and 8 ', the stretchable portions 9 and the support portions 10 are alternately arranged in the tube axis direction.

  Between the sealing portions 8 and 8 ′, a support portion 10 having no expansion allowance and having a higher strength than the expansion / contraction portion 9 is interposed along with the expansion / contraction portion 9. Increased design flexibility of support strength.

  Next, the expansion / contraction part 9 will be described. The expansion / contraction portion 9 is formed in a bellows shape having alternately uneven portions in the radial direction along the tube axis direction in order to easily configure the expansion / contraction allowance.

  More specifically, each of the concave portion 9b formed inward of the convex portion 9a projecting in the outer diameter direction of the expansion / contraction portion 9 and the convex portion 9c projecting in the inner diameter direction in which the concave portion 9d is formed outward are provided. The stretchable portions 9 are formed alternately in the tube axis direction, thereby forming the bellows in a side cross-sectional view, and the size in the tube axis direction can be extended or shortened so that it can expand and contract.

  Further, the inner peripheral side of the expansion / contraction part 9 will be described with reference to an enlarged view of a main part in FIG. 2. A convex surface 9e which is a projecting surface of the convex part 9c is a straight surface extending linearly in the tube axis direction in a side sectional view. Thus, the groove width of the concave portion 9b formed inside the convex portion 9a is substantially constant toward the inner side in the radial direction. Therefore, in a state where the support member 7 formed of a ring body is fitted in the recess 9b, the position of the support member 7 is secured without dropping from the recess 9b even if the expansion / contraction part 9 expands and the groove width of the recess 9b increases. The When the expansion / contraction part 9 expands / contracts, the expansion / contraction allowance of the expansion / contraction part 9 is ensured without loss of expansion / contraction flexibility due to expansion / contraction of the recess 9b and the recess 9d except the recess 9b in which the support member 7 is fitted.

  When the pipe inner surface repair band 4 is attached to an existing fluid pipe buried in the ground as in this embodiment, as described above, the two-end pipes 1 and 2 themselves or the pipe joint portion are caused by uneven settlement or the like. In some cases, distortion or bending may occur. However, since the pipe inner surface repair band 4 has expansion / contraction flexibility due to the expansion / contraction part 9, the relative displacement of the two-end pipes 1, 2 displaced due to this distortion or bending. It can be easily installed by deforming following the position.

  Next, the support member 7 will be described. The concave portion 9b formed inside the convex portion 9a formed on the inner peripheral side of each expansion / contraction portion 9 is formed as an annular groove portion. Of the recesses 9b (three in this embodiment), the support member 7 is fitted into the center recess 9b to support the expansion / contraction part 9 in the outer diameter direction. Since the support member 7 is formed to have an outer diameter that is substantially the same as the inner diameter of the concave portion 9b in the natural state of the expansion / contraction part 9, from any direction against the external force applied in the inner diameter direction by the two-end pipes 1 and 2 Can even withstand equally.

  For example, the support member 7 is configured as a substantially C-shaped ring body with a part of the cutout, and the diameter of the substantially C-shaped ring body reduced in diameter at the position of the recessed portion 9b to be fitted is expanded to form an annular groove portion. The support member can be easily disposed by fitting into the formed recess 9b. The contact force acting on the inner surface of the fluid pipe of the expansion / contraction part can be set by adjusting the diameter expansion force according to the notch width or the material of the ring body. In addition, if the diameter of the inserted substantially C-shaped ring body is reduced, it can be removed from the recess 9b, so that the support member can be easily replaced and the insertion position can be easily changed. When reducing the diameter of the substantially C-shaped ring body, it is convenient to provide a known operation jig that can be mechanically operated by screws, bands, etc. on the inner surface side of the ring body.

  Thereby, against the external force loaded in the inner diameter direction with respect to both the mouth pipes 1 and 2 due to the earth pressure of the surrounding ground or the water pressure of the groundwater, it is possible to prevent the expansion and contraction portion 9 from bending and deforming in the inner diameter direction, The flow cross-section of the fluid flowing inside the pipe is secured and the flow is not hindered. The external force applied to the both-end pipes 1 and 2 in the inner diameter direction is not limited to the above-described external force due to earth pressure or water pressure. For example, the upper part of the both-end pipes 1 and 2 is lowered downward, that is, in the inner diameter direction. The support member 7 supports the expansion / contraction part 9 against the gravity that deflects the upper portions of the two-end pipes 1 and 2 in the inner diameter direction, and the expansion / contraction part 9 bends in the inner diameter direction. Prevents deformation.

  As described above, the pipe inner surface repair band 4 is attached over the inner peripheral surfaces 1b and 2b of the insertion tube 1 and the receiving tube 2 in a sealed manner. Next, the pipe inner surface repair band 4 when an external force that tries to move relative to the insertion tube 1 and the receiving tube 2 in the tube axis direction is applied will be described.

  When an external force is applied to move the insertion tube 1 and the receiving tube 2 relative to each other in the tube axis direction, the fixed bands 6 and 6 ′ located at both ends of the tube body member 5 in the tube axis direction are The intubation tube 1 and the receiving tube 2 move in conjunction with each other. As described above, the cylindrical body member 5 is pressed against the inner peripheral surfaces 1b and 2b of the two-end pipes 1 and 2 by the fixing bands 6 and 6 'at the sealing portions 8 and 8', respectively. The force which expands / contracts the cylinder body member 5 acts by relative movement of each '. More specifically, the expansion and contraction portion 9 of the cylinder body member 5 is stretched or contracted to allow relative movement of the both-end pipes 1 and 2 by the size of the expansion and contraction allowance of the expansion and contraction portion 9 and expansion and contraction. The support member 7 provided on the inner peripheral side of the portion 9 can secure the degree of freedom of expansion and contraction without interfering with the expansion and contraction of the expansion and contraction portion 9 in the tube axis direction. In this way, the expansion and contraction portion 9 follows the relative movement of the both-end pipes 1 and 2 so as to slide with respect to the outer peripheral surface of the support member 7, so that the inner peripheral surface 1b of the both-end pipes 1 and 2, Since the load applied to the fixed bands 6 and 6 ′ and the sealing portions 8 and 8 ′ in contact with 2b is reduced, the sealing performance is maintained.

  As a result, the fluid inside the both-end pipes 1 and 2 does not leak to the outside, and the fluid does not enter inside the both-end pipes 1 and 2. Further, when an external force in the inner diameter direction is applied to the both-end pipes 1 and 2, the support portion 10 is adapted to counter the external pressure, and the outer peripheral surface of the support member 7 is the inner peripheral surface of the thin stretchable portion 9. , The expansion / contraction part 9 is prevented from being deformed in the inner diameter direction of the cylindrical body member 5 by external pressure.

  As described above, the pipe inner surface repair band 4 of the present invention includes the sealing portions 8 and 8 ′ that are in contact with the inner surfaces of the insertion tube 1 and the receiving tube 2 in a sealing manner, and the sealing portions 8 and 8 ′. A concave portion 9b formed inward of the convex portion 9a projecting in the outer diameter direction, having an expansion / contraction allowance that follows the relative position or relative movement of the two-end pipes 1 and 2, interposed in the tube axis direction therebetween A cylindrical body member 5 having at least a bellows-like stretchable portion in which convex portions 9c projecting in the inner diameter direction, each having a concave portion 9d formed on the outside, are alternately provided along the tube axis direction; By selectively fitting into any one of the plurality of recesses 9b formed inward of the projections 9a projecting in the outer diameter direction, It is mainly comprised from the supporting member 7 which supports the expansion-contraction part 9 against external force. A telescopic portion 9 of the cylindrical body member 5 that follows the relative position or relative movement of the two-end pipes 1 and 2 connected to each other is supported by the support member 7 against an external force in the inner diameter direction. For example, even if the expansion / contraction part 9 having a relatively low strength is used, the diameter can be maintained without being reduced by an external force in the inner diameter direction, so that a flow path in the both-end pipes 1 and 2 is secured. In addition, the sealed portions 8 and 8 'are not affected by the external force in the inner diameter direction, and the sealed state of the two-end pipes 1 and 2 by the sealed portions 8 and 8' can be maintained.

  Next, a modified example of the pipe inner surface repair band 4 according to the embodiment will be described with reference to FIGS. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 3, the pipe inner surface repair band 14 is sealed in a state of being fixed by the fixing bands 6 and 6 ′ across the insertion pipe 1 and the receiving pipe 2 connected in the same manner as in the above embodiment. It is erected in a shape.

  Further, the cylindrical body member 15 of the pipe inner surface repair band 14 has two expansion / contraction parts 9 and 9 between the sealing parts 8 and 8 ′ in the pipe axis direction and a support part disposed between the expansion / contraction parts 9 and 9. 4, and as shown in FIG. 4A, the stretchable part 9 is formed in a bellows shape in which radial concavo-convex parts are alternately arranged along the tube axis direction. However, unlike the configuration of the stretchable part of the above embodiment, a large number of uneven parts are formed.

  More specifically, the concavo-convex portion of the stretchable portion 9 is composed of seven concave portions 9b and seven convex portions 9a, and the concave portions 9b and adjacent convex portions 9c are alternately arranged. And every other support member 7 is inserted and arranged inside the annular groove of the seven recesses 9b. Thus, even if the number of concavo-convex portions is increased in order to further secure stretchability, the support force can be obtained by selecting the number and arrangement of the support members with respect to the external force in the inner diameter direction.

  FIG. 4B is a partially enlarged view of the stretchable part showing a modified example 2 that is different from the modified example (modified example 1) shown in FIG. 4A, and has three support members 7 at the center. It is inserted into three continuous recesses 9b formed. By continuously arranging the support member 7 in this manner, it is possible to intensively reinforce the flexible portions of the stretchable portion formed long, thereby increasing the support force.

  In the first and second modifications, the number of support members 7 and the position of the support members 7 are selected according to the number of concavo-convex portions, and the stretchability and support strength are set so that the stretchable flexibility of the stretchable portion 9 functions sufficiently. In addition to the above examples, the length and number of the support portions, the material of the stretchable portion 9, the outer diameter of the fluid pipe, the strength of the support member 7 and the like are taken into consideration. Since the number to be used can be freely selected and determined, it is possible to provide a pipe inner surface repair band that can be used for various types of fluid pipes while leaving an expansion / contraction allowance.

  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-described embodiment, the plurality of stretchable portions 9 and the support portions are alternately and regularly arranged in the tube axis direction. However, the present invention is not limited to this, and the stretchable portions 9 and the stretchable portions may be arranged irregularly. Even if 9 is disposed on substantially the entire surface other than the sealing portions 8 and 8 ', the cylindrical body member may be configured in various manners.

  Further, for example, the number of concavo-convex portions formed in the bellows shape on the stretchable portion 9 is not limited to the above-described embodiment, and can be appropriately set according to a desired stretch width of the stretchable portion. Furthermore, in the said Example, although the uneven | corrugated | grooved part formed in the expansion-contraction part 9 in the shape of a bellows was provided in the orthogonal | vertical direction with respect to the tube axis, you may form an uneven | corrugated surface in a diagonal direction with respect to a tube axis, for example.

  Further, for example, in the above-described embodiment, the support member is formed of a substantially C-shaped ring body in order to have a diameter-expanding action. However, for example, the support member can be divided to increase the diameter when the recess is inserted. May be.

  Further, for example, the cross-sectional shape of the fluid pipe used in the present invention is not limited to a circular shape, and may be, for example, a rectangular shape or an elliptical shape, and a cylindrical body member or a support member may be used in accordance with the cross-sectional shape. Needless to say.

1 Inlet tube (fluid tube)
2 receiving pipe (fluid pipe)
4 Pipe inner surface repair band 5 Cylinder body member 6, 6 'Fixed band (fixed member)
7 Support member 8, 8 'Sealing part 9 Extendable part 9a Convex part 9b Concave part 9c Convex part 9d Concave part 9e Convex surface 10 Support part 14 Pipe inner surface repair band 15 Cylindrical member 16 Support part

Claims (4)

In a pipe joint in which one fluid pipe and the other fluid pipe are connected, a pipe inner surface repair band that is erected in a sealed manner over the inner surface of both fluid pipes in the circumferential direction,
Each of the sealing portions that contact the inner surfaces of both the fluid pipes in a sealing manner, and an expansion / contraction allowance interposed between the respective sealing portions in the pipe axis direction to follow the relative position or relative movement of the both fluid pipes. Convex portions formed on the inner side of the convex portion projecting in the outer diameter direction and convex portions projecting in the inner diameter direction formed with the concave portion on the outer side are alternately arranged along the tube axis direction. A cylindrical body member provided with at least a bellows-like stretchable part;
By selectively fitting into any one of the plurality of recesses formed inward of the projections projecting in the outer diameter direction of the telescopic portion, the external force in the inner diameter direction with respect to the fluid pipe A pipe inner surface repair band, comprising: a support member that supports the expansion and contraction portion.   2. The pipe inner surface repair band according to claim 1, wherein the cylindrical body member includes a support portion that is provided in parallel with the expansion / contraction portion between the sealing portions and does not have the expansion / contraction allowance. .   The pipe inner surface repair band according to claim 1, wherein the support member is formed of a ring body that can be expanded in an outer diameter direction.   4. The inside of a pipe according to claim 1, wherein a fixing member is provided on an inner surface of each of the sealing parts to make each of the sealing parts abut against the inner surface of the fluid pipe in a sealing manner. 5. Surface repair band.

Images