JP2013096460A - Pipe inner surface repair band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe inner surface repair band capable of preventing diameter reduction caused by an external force applied in an inner diameter direction while retaining the expansion and contraction flexibility of the expansion and contraction part of a tubular body member.SOLUTION: The pipe inner surface repair band comprises: a tubular body member 5 having sealing parts 8, 8' that come in contact with inner surfaces of a spigot pipe 1 and a socket pipe 2 in a sealing manner, respectively, and an expansion and contraction part 9 having a margin for expansion and contraction that follow relative positions or relative shifts of both the spigot and socket pipes 1, 2; a holding member 12 disposed in the axial direction across at least a part thereof while being internally in contact with the inner surface of the expansion and contraction part 9; and a support member 7 that supports the holding member 12 that comes in contact with the expansion and contraction part 9 while withstanding an external force in the direction of the inner diameter with respect to both the spigot and socket pipes 1, 2 while the expansion and contraction part 9 is formed in a shape of a bellows having vertical convex and concave surfaces alternately along the pipe axial direction, whereby the convex surface 9e that comes in contact with the holding member 12 in the direction of the inner diameter of the expansion and contraction part 9 is formed at a linear surface extending straight along the pipe axial direction while the holding member 12 is kept in contact with the outer surface of the support member 7 for the retention of the support member 7.

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, the reinforcing plate is interposed between the annular body and the fixed plate, and the convex and concave portions of the reinforcing plate are engaged with the irregular shape of the annular body. The engaging portion has a problem that the flexibility of expansion and contraction is lost.

  The present invention has been made paying attention to such a problem, and provides a pipe inner surface repair band that prevents a diameter reduction by an external force in an inner diameter direction while maintaining expansion / contraction flexibility of an expansion / contraction portion of a cylindrical body member. The purpose is to do.

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. A cylinder body member having at least an elastic part having
A holding member that is in contact with the inner surface of the expansion and contraction portion and disposed over at least a part of the tube axis direction;
A support member that supports the expansion / contraction part via the holding member against an external force in an inner diameter direction with respect to the fluid pipe,
The expansion / contraction part is formed in a bellows shape alternately having a concavo-convex surface in the radial direction along the tube axis direction, and the convex surface in the inner diameter direction of the expansion / contraction part contacting the holding member is along the tube axis direction. It is formed on a straight surface that extends in a straight line,
The holding member is in contact with an outer surface of the support member and holds the support member.
According to this feature, at least a part of the expansion / contraction part of the cylinder body member that follows the relative position or relative movement of the fluid pipes connected to each other is supported by the support member against the external force in the inner diameter direction via the holding member. The expansion / contraction part with the expansion / contraction allowance in the tube axis direction and the relatively low strength can maintain the diameter without being reduced by the external force in the inner diameter direction. However, the sealed state of the fluid pipe by the sealing portion can be maintained without being affected by the external force in the inner diameter direction. In addition, since the expansion / contraction part is formed in a bellows shape having an uneven surface, not only can the expansion / contraction allowance be easily configured, but also the expansion / contraction part formed on the linear surface extending linearly along the tube axis direction. By abutting with the convex surface, the contact area between the holding member and the stretchable part can be expanded, and the stretchable part can be stably supported by the support member via the holding member. Furthermore, since the outer surface of the support member is held in contact with the inner surface of the holding member, axial movement is suppressed and the support by the support member is stabilized.

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 inner surface of the holding member is provided with a restricting portion that restricts movement of the support member in the tube axis direction with respect to the extendable portion.
According to this feature, since the support member is restricted from moving relative to the expansion / contraction part by the restriction part provided on the inner surface of the holding member, the support member moves relative to the expansion / contraction part that moves following the relative movement of the fluid pipe. The support state in the radial direction of the stretchable part can be maintained without any problems.

The pipe inner surface repair band of the present invention is
The expansion / contraction part is formed in a bellows shape having alternately uneven surfaces in the radial direction along the tube axis direction, and the holding member is provided with a fitting part that fits into the uneven surface of the expansion / contraction part. It is characterized by being.
According to this feature, since the fitting portion of the holding member is fitted to the uneven surface of the expansion / contraction portion, the holding member does not come off from the expansion / contraction portion that expands and contracts following the fluid pipe.

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 sectional side view which shows the pipe inner surface repair band in the modification 1 of this invention. It is a sectional side view which shows the pipe inner surface repair band in the modification 2 of this invention.

  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 FIG.

  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, the holding member 12 disposed in contact with the inner surface of the expansion / contraction part 9 and arranged in the tube axis direction, and the expansion / contraction part 9 through the holding member 12 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 support member 7 which supports.

  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, the support member 7, and the holding member 12 is composed of a substantially arc-shaped divided member divided into a plurality of circumferential directions (not shown), and is formed into 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 in-pipe fluid are made of stainless steel in the present embodiment, are not easily rusted, and have higher rigidity than the cylindrical body member 5 and the holding member 12. ing. Further, the fixing band 6 and the support member 7 may be, for example, substantially C-shaped in the circumferential direction and having a diameter expanding means in the radial direction. It may be made of steel or a resin having higher rigidity than the cylindrical body member.

  The holding member 12 will be described. The holding member 12 is made of an elastic material such as a rubber material or a synthetic resin material, and is disposed over at least a part of the tube axis direction in contact with the inner surface of the stretchable portion 9. ing. Further, on the inner surface of the holding member, restricting portions 13 and 13 'project from the both ends in the tube axis direction in the inner diameter direction, and the support member 7 is accommodated in the gap between the restricting portions 13 and 13'. Since the annular groove portion 11 is formed, the movement of the support member 7 relative to the holding member is restricted in the annular groove portion 11.

  More specifically, the width of the support member 7 in the tube axis direction is formed to be smaller than the width of the annular groove portion 11, that is, the side peripheral edges 7a and 7a 'of the support member 7 and the side peripheral edges 13a of the restricting portions 13 and 13'. , 13a ′, the support member 7 is allowed to move in the gap corresponding to the position of the holding member 12 in the tube axis direction. The movement with respect to the holding member 12 in the tube axis direction is restricted by 7a 'coming into contact with the side peripheral edges 13a, 13a' of the restricting portions 13, 13 '. In the present embodiment, the annular grooves 11 are formed in the gaps by the restricting portions 13 and 13 'projecting in the inner diameter direction. For example, the restricting portion of the present invention is a partial portion in the circumferential direction. Alternatively, it may be scattered at predetermined intervals in the circumferential direction.

  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. 1, the cylindrical body member 5 is formed with an expansion / contraction part 9 having an expansion allowance and a contraction allowance that can extend 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.

  As described above, the movement of the support member 7 relative to the holding member 12 is restricted by the restriction portions 13 and 13 ′ provided on the holding member 12, and the fitting portion of the holding member 12 will be described in detail later. 14 is fitted in the recess 9b of the expansion / contraction part 9, so that the movement with respect to the expansion / contraction part 9 is restricted. Without moving, the support state in the radial direction of the stretchable part 9 can be maintained.

  Next, the expansion / contraction part 9 will be described (see a partially enlarged view). The stretchable portions 9 are formed in a bellows shape having alternately uneven surfaces in the radial direction along the tube axis direction. According to this, the expansion / contraction part 9 can be easily comprised by forming in the substantially bellows shape which has an uneven surface.

  More specifically, on the outer peripheral side of the expansion / contraction part 9, a plurality of protrusions 9a projecting in the outer diameter direction (three in this embodiment) and a plurality of recesses 9d opening in the outer diameter direction (in this embodiment) Similarly, a plurality of convex portions 9c (two in this embodiment) projecting in the inner diameter direction are provided on the inner peripheral side of the stretchable portion 9 and in the inner diameter direction. A plurality of recesses 9b (three strips in the present embodiment) that open toward each other are alternately arranged. Thereby, the expansion / contraction part 9 has an uneven surface, is formed in a bellows shape in a side sectional view, and can be expanded and contracted by extending or shortening the dimension in the tube axis direction.

  Further, the inner peripheral side of the expansion / contraction part 9 will be described. The 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, and the convex surface 9e is It continues along the circumferential direction of the stretchable part 9. Therefore, when the holding member 12 is in contact with the convex surface 9e of the convex part 9c, the contact area between the holding member 12 and the elastic part 9 can be expanded, and the elastic part 9 can be stably supported.

  When the expansion / contraction part 9 expands / contracts, the convex surface 9e of the convex part 9c slides smoothly in the tube axis direction with respect to the outer peripheral surface of the holding member 12, so the holding provided on the inner peripheral side of the expansion / contraction part 9 The member 12 does not interfere with the expansion / contraction part 9 and the expansion / contraction flexibility of the expansion / contraction part 9 is not lost. In particular, when the holding member does not provide the fitting portion, since there is no interfering member in the concave portion 9b, the gap of the concave portion 9b is secured and the shrinkage allowance is not lost. Further, when the expansion / contraction part 9 expands / contracts, the inner peripheral side of the expansion / contraction part 9 is reduced in diameter, so that the convex surface 9e of the expansion / contraction part 9 is pressed against the outer surface of the holding member 12 to stably support the expansion / contraction part 9. Will contribute.

  In addition, the expansion / contraction part 9 is formed in a bellows shape having alternating radial concavo-convex surfaces along the tube axis direction in the same manner as the configuration of the above embodiment, and is formed in the holding member 12 and in the concave part 9b of the expansion / contraction part 9. A fitting portion 14 to be fitted is provided.

  Since the fitting part 14 of the holding member 12 is fitted to the recess 9b of the expansion / contraction part 9, the holding member 12 does not come off from the expansion / contraction part 9 that expands and contracts following the both-end pipes 1 and 2. .

  More specifically, the fitting portion 14 that fits into the concave portion 9b that constitutes the concave and convex surface of the expansion / contraction portion 9 includes two concave portions 9b, excluding the central concave portion 9b in the tube axis direction, among the three concave portions 9b. Is fitted in only the concave portion 9b on the center side while being extendable. That is, one strip is provided on the outer peripheral surface of the holding member 12, and when the fitting portion 14 is fitted into the concave portion 9 b, the movement of the holding member 12 in the tube axis direction is restricted and comes off from the telescopic portion 9. There is nothing. Moreover, when the expansion / contraction part 9 expands / contracts, only the single fitting part 14 is fitted to the three concave parts 9b, and the concave / convex part 9b except the concave part 9b can be freely expanded and contracted. The expansion / contraction flexibility is not lost by fitting the expansion / contraction part 9 and the holding member 12 together. In other words, since the gap between the recesses 9b is ensured except for the center of the three recesses 9b, the shrinkage allowance is not lost. Moreover, since the fitting part 14 protrudes a little smaller than the depth direction dimension of the recessed part 9b, the space | gap is left in the recessed part 9b which the fitting part 14 fitted. Therefore, not only can the fitting portion 14 be easily fitted into the recess 9 b, but also the outer surface of the holding member 12 can be reliably brought into contact with the convex surface 9 e of the extendable portion 9. Furthermore, the space formed in the concave portion 9b into which the fitting portion 14 is fitted can secure a movement allowance in the radial direction that accompanies the expansion and contraction in the axial direction of the stretchable portion 9, so that the stretchable portion 9 easily stretches.

  Further, the inner surface 16 a of the support portion 16 and the convex surface 9 e of the convex portion 9 c are flush with each other as a straight surface in the tube axis direction in a side sectional view, and the straight surface is along the circumferential direction of the cylinder body member 15. Since the holding member 12 is continuous, the holding member 12 is brought into contact with the convex portion 9c of the expansion / contraction portion 9 formed on the linear surface along the tube axis direction and a part of the holding portion 13, so that The contact area with the expansion / contraction part 9 can be expanded, and the expansion / contraction part 9 can be supported stably.

  In the present embodiment, the fitting portion 14 is fitted in the concave portion 9b located in the center of the tube axis direction among the three concave portions 9b, but is fitted in any position of the concave portion 9b. Also good. Further, not limited to this embodiment, for example, a plurality of fitting portions may be provided on the outer surface of the holding member 12 and fitted into the recesses 9b to be in a stronger fitting state with the expansion and contraction portion. For example, by setting the width of the fitting portion 14 in the tube axis direction to be smaller than the width of the recess 9b in the tube axis direction, the stretchability and the support strength are appropriately set so that the stretchable flexibility of the stretchable portion 9 functions sufficiently. Can be set.

  Further, in the present embodiment, the fitting portion 14 is provided over the entire outer peripheral surface of the holding member 12, but for example, partially on the outer peripheral surface of the holding member 12 in the circumferential direction or at predetermined intervals in the circumferential direction. The fitting portions may be dotted.

  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 support member 7 is housed and disposed in the annular groove 11 of the holding member 12 formed on the inner peripheral side of each expansion / contraction part 9, and supports the expansion / contraction part 9 toward the outer diameter direction. It is a member to do. The support member 7 is formed to have an outer diameter that is substantially the same as the inner diameter in the natural state of the holding member 12, and after the support members 7 that are divided into a plurality of portions in the circumferential direction are stored and arranged in the annular grooves 11, By assembling the support member 7 into a circular shape, the outer peripheral surface of the support member 7 comes into contact with the inner peripheral surface of the holding member 12.

  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 holding member 12 and 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. It prevents bending and deformation in the inner diameter direction.

  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 holding member 12 provided on the inner peripheral side of the portion 9 can ensure 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 part 9 follows the relative movement of the both-end pipes 1 and 2 so as to slide relative to the outer peripheral surface of the holding member 12, so that the inner peripheral surface 1 b 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 counters the external pressure, and the outer peripheral surface of the holding member 12 is the inner peripheral surface of the thin stretchable portion 9. Since the outer peripheral surface of the support member 7 is in contact with the inner peripheral surface of the holding member 12, the expansion / contraction part 9 is prevented from being deformed in the inner diameter direction of the cylinder 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 cylindrical body member 5 having at least an expansion / contraction part 9 having an expansion / contraction allowance that follows the relative position or relative movement of the two-end pipes 1 and 2 is interposed between the tube body member 5 and the inner surface of the expansion / contraction part 9. A holding member 12 disposed over at least a part in the tube axis direction, and a support member 7 that supports the expansion / contraction part 9 via the holding member 12 against an external force in the inner diameter direction with respect to the both-end pipes 1 and 2. The expansion / contraction part 9 is formed in a bellows shape having radial concavo-convex surfaces alternately along the tube axis direction, and the convex surface 9e in the inner diameter direction of the expansion / contraction part 9 contacting the holding member 12 The holding member 12 is formed on a linear surface extending linearly along the axial direction. It abuts to retain the support member 7 in. The expansion / contraction part 9 of the cylindrical body member 5 that follows the relative position or relative movement of the both-end pipes 1, 2 that are in contact with and supported by the inner peripheral surface of the holding member 12 supports the supporting member via the holding member 12. 7 is supported by an external force in the inner diameter direction, and the expansion / contraction part 9 having an expansion allowance in the tube axis direction and having a relatively low strength can maintain the diameter without being reduced in diameter by the external force in the inner diameter direction. Not only can the flow path in the mouth pipes 1 and 2 be secured, but the sealing parts 8 and 8 'are not affected by the external force in the inner diameter direction, and the both mouth pipes 1 and 2 are sealed by the sealing parts 8 and 8'. The state can be maintained. Further, since the expansion / contraction part 9 is formed in a bellows shape having an uneven surface, the expansion / contraction allowance can be easily configured, and the holding member 12 is formed in a linear surface extending linearly along the tube axis direction. By contacting the convex surface 9e of the expansion / contraction part 9, the contact area between the holding member 12 and the expansion / contraction part 9 can be expanded, and the expansion / contraction part 9 can be stably supported by the support member 7 via the holding member 12. Further, since the outer surface of the support member 7 is held in contact with the inner surface of the holding member 12, the axial movement is suppressed and the support by the support member 7 is stabilized.

  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, a plurality of the stretchable portions 9 and the support portions are alternately arranged in the tube axis direction, but the present invention is not limited to this, for example, as Modification 1 of the present invention, as shown in FIG. The expansion / contraction part may be disposed on substantially the entire surface other than the sealing parts 8 and 8 ', or as a second modification of the present invention, as shown in FIG. The member 12 and the support member 7 are disposed, and an expansion / contraction part may be disposed in addition to the holding member 12, the support member 7 and the sealing portions 8 and 8 ′, and the cylindrical body member may be configured in various modes. .

  In addition, for example, in the above-described embodiment, all the extending and retracting members 13 that support the expansion / contraction part 9 against the external force in the inner diameter direction with respect to the both-end pipes 1 and 2 are arranged via the support part in the tube axis direction Although it arrange | positions over the pipe-axis direction of the part 9, for example, a holding member and a supporting member may be arrange | positioned so that only some expansion-contraction parts may be supported among the expansion-contraction parts arrange | positioned in multiple numbers. Further, in this embodiment, the holding member 12 and the support member 7 are arranged over the entire tube axis direction of each expansion / contraction part 9, but for example, the holding member 12 and the support member are tubes of each expansion / contraction part. It may be arranged over only a part in the axial direction, or when the expansion / contraction part is arranged on substantially the whole surface other than the sealing parts 8 and 8 ′ as described above, You may arrange | position over only a part.

  Further, the number of concave and convex surfaces (concave portions, 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 surface formed in the bellows shape in the expansion-contraction part 9 was provided in the orthogonal direction with respect to the pipe axis, you may form an uneven surface in the diagonal direction with respect to a tube axis, for example.

  Moreover, although the fitting part 14 of the said Example was fitted by the recessed part 9b of the expansion-contraction part 9, not only this but the recessed part as a fitting part is fitted by the convex part 9c of the expansion-contraction part 9, for example. Also good.

  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 Convex part 10e Convex surface 10 Support part 11 Annular groove part 12 Holding member 13, 13' Restriction part 14 Fitting part

Claims (5)

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. A cylinder body member having at least an elastic part having
A holding member that is in contact with the inner surface of the expansion and contraction portion and disposed over at least a part of the tube axis direction;
A support member that supports the expansion / contraction part via the holding member against an external force in an inner diameter direction with respect to the fluid pipe,
The expansion / contraction part is formed in a bellows shape alternately having a concavo-convex surface in the radial direction along the tube axis direction, and the convex surface in the inner diameter direction of the expansion / contraction part contacting the holding member is along the tube axis direction. It is formed on a straight surface that extends in a straight line,
The pipe inner surface repair band, wherein the holding member holds the support member in contact with the outer surface of the support member.   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. .   3. The pipe inner surface repair band according to claim 1, wherein a regulation part that regulates movement of the support member in the pipe axis direction with respect to the expandable part is provided on an inner surface of the holding member.   The expansion / contraction part is formed in a bellows shape having alternately uneven surfaces in the radial direction along the tube axis direction, and the holding member is provided with a fitting part that fits into the uneven surface of the expansion / contraction part. The pipe inner surface repair band according to any one of claims 1 to 3, wherein the pipe inner surface repair band is provided.   5. The inside of a pipe according to claim 1, wherein a fixing member is provided on an inner surface of each of the sealing portions so as to abut each of the sealing portions against the inner surface of the fluid pipe in a sealing manner. Surface repair band.

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