JP2008144940A - Expansion pipe water leakage preventing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compactify and lighten an expansion pipe water leakage preventing device. <P>SOLUTION: An outer circumference of the expansion tube 1 between pipe bodies p, p is covered by an expansion cover 2 having flexibility to water-tightly fix both pipe bodies p, p, connection of both pipe bodies p, p is maintained via the expansion cover 2 when the expansion pipe 1 is separated from the pipe body p, and an outer circumference of the expansion cover 2 is covered by a cylindrical protection cover 40. The protection cover 40 has a flat sheet part 41 made of fiber, and circumferential fiber reinforcement belts 42 and axial fiber reinforcement belts 44 fixed like a grid to the sheet part 41. Both ends 44a, 44a of the axial reinforcement belt 44 is fixed to both pipe bodies p, p. Swelling of the expansion cover 2 in an outer diameter direction due to a hydraulic pressure is constrained and reinforced by the protection cover 2, and most of force acting on the protection cover 40 is borne by the reinforcement belts 12, 14 extending in all directions. By this, thickness increase and weight increase of the protection cover 40 can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  This invention is a pipe bridge provided when a water pipe, various water supply pipes, oil supply pipes, etc. intersect with rivers, roads, railways, etc. in the form of bridges. The present invention relates to an expansion tube water leakage prevention device attached to an expansion tube joint that allows displacement in the axial direction and the tube diameter direction).

A pipe bridge (a so-called water pipe bridge, an attached pipe, etc., hereinafter collectively referred to as a “water pipe bridge”) B provided when a water pipe crosses a river, road, railway, etc. is, for example, an abutment A shown in FIG. However, they are provided opposite to each other in the same manner as a normal bridge, and a water pipe bridge B is configured by connecting the opposite abutments A and A with a pipe body p.
In this structure, the expansion and contraction tube is inserted in the middle of the tube p so that the expansion and contraction of the tube p accompanying the temperature change, the tensile force, the pushing force and the bending acting on the tube p due to the substructure displacement due to an earthquake or the like can be absorbed. Many have 1

  Furthermore, in recent years, the ability to follow larger deformations of water pipe bridges is being demanded in order to cope with significant earthquake motions. That is, it is required to prevent the tubular body p from being damaged or piped out even with a larger expansion or contraction in the tube axis direction or a larger displacement in the tube diameter direction (a direction perpendicular to the tube axis). Yes.

  However, providing such a function in the water pipe bridge leads to an increase in the size of the bridge abutment and an increase in cost as the telescopic pipe increases in size. In addition, there is a problem that renovation of the existing water pipe bridge requires considerable cost and time.

  Therefore, while using a conventional inexpensive non-bulk telescopic tube, it is possible to prevent water leakage and maintain the water flow function in the unlikely event that the telescopic tube is removed or damaged due to significant earthquake motion. The technology of the expansion / contraction tube water leakage prevention apparatus made into this is disclosed.

  For example, in the technique described in Patent Document 1, an expansion tube leakage prevention device is attached to the outer peripheral portion of an expansion tube provided at both ends of a water tube bridge.

As shown in FIG. 15, the outer periphery of the expansion / contraction tube (expansion tube joint) 1 is covered with a rubber expansion / contraction cover 2 over the entire periphery and the entire length thereof. The extensible cover 2 has both axial ends thereof fixed in a watertight manner by fastening members 6 to the fixtures 3, 3 of the pipes p, p on both sides of the extensible pipe 1, respectively.
The fastening member 6 is a water-stop band made of a band of high-strength fiber or the like impregnated with resin. By winding the fastening member 6 around the outer periphery of the stretchable cover 2, the stretchable cover 2 is It is fixed so as to be fastened to the outer periphery of the fixture 3.

  Further, the outer periphery of the stretchable cover 2 is covered with a cylindrical protective cover 10 made of high-strength fibers. Both ends of the protective cover 10 in the axial direction are fixed to the pipes p and p with stop rings 5 that fit around the outer circumferences of the pipes p and p.

  When the telescopic tube 1 is detached from the tubular body p due to the earthquake motion, for example, as shown in FIGS. 16 (a) to 16 (b), the telescopic cover 2 is deformed and the both tubular bodies are interposed via the telescopic cover 2. The connection between p and p is maintained. For this reason, leakage of the water pipe bridge is prevented, and the water flow function is not hindered.

Further, since the protective cover 10 covering the outer periphery of the expansion / contraction cover 2 is fixed to both pipes p and p, the protection cover 10 supports the pipes p and p that have been removed from the expansion / contraction pipe 1.
Further, the protective cover 10 reinforces the expansion / contraction cover 2 by restraining the expansion / contraction cover 2 made of rubber from expanding to the outer diameter side due to water pressure, and an excessive force acts on the expansion / contraction cover 2 to be damaged. It is preventing.
In addition, the protective cover 10 can also be expected to have an effect of preventing a fallen bridge by restraining the separation of both pipes p and p at a predetermined position (see, for example, Patent Document 1).

JP 2003-96833 A

  According to the expansion / contraction tube leakage prevention device shown in FIGS. 15 and 16, the expansion / contraction cover 2 is made of a flexible material such as rubber, and therefore has a relatively low strength. For this reason, the protective cover 10 that reinforces the stretchable cover 2 is required to have a relatively high strength.

However, when the protective cover 10 is required to have a strong strength, the protective cover 10 has a considerable thickness and weight.
An increase in the bulk or weight of the protective cover 10 is not preferable because it leads to an increase in size and cost of the telescopic tube water leakage prevention device.

  Then, this invention makes it a subject to make it a compact and lightweight expansion-pipe water leakage prevention apparatus, exhibiting predetermined intensity | strength.

  In order to solve the above-described problems, the present invention employs a fiber cover as a protective cover disposed outside the stretchable cover, and the structure is applied to the surface of the flat sheet portion made of fiber covering the stretchable cover. A lattice-like fiber belt extending in the circumferential direction and the axial direction is fixed.

Since the material that reinforces the expansion / contraction cover does not require strict watertightness (waterproofness), it is possible to use fibers as the material for the protective cover. Since the fiber is light, it can contribute to weight reduction.
Moreover, as the strength required for the protective cover, as described above, in addition to the flat sheet portion made of fiber, the reinforcing belt made of fiber is arranged in a lattice shape, so the expansion cover swells to the outer diameter side due to water pressure In this case, each reinforcing belt can counter the force in its length direction. That is, since the tension generated in the entire cover is transmitted to the reinforcing belt, the member of the seat portion does not need to be thick.
For this reason, a predetermined strength can be exhibited while suppressing an increase in the thickness and weight of the entire protective cover. For example, if a material called high-strength fiber such as aramid fiber is used to exhibit a predetermined strength, it is more effective in suppressing the increase in bulk.

As a specific configuration, it is possible to adopt a mode in which the protective cover is fixed to the tubular body at the outer periphery of both end portions in the axial direction of the extendable cover.
That is, the configuration is such that the outer periphery of the expansion tube connecting the tubular bodies is covered with a flexible cylindrical expansion cover over the entire length in the axial direction, and the entire circumferences of both ends in the axial direction of the expansion cover are respectively For a telescopic tube, which is fixed to a tubular body in a watertight manner so that when the telescopic tube is detached from the tubular body, the telescopic cover is deformed so that the connection between the two tubular bodies is maintained via the telescopic cover. In the water leakage prevention device, the outer periphery of the expansion / contraction cover is covered with a cylindrical protective cover, and the protective cover is a cylindrical fiber-shaped flat sheet portion, and a circumferential direction fixed to the sheet portion in a lattice shape An annular fiber-reinforced belt continuous over the entire circumference and a fiber-reinforced belt extending in the entire axial direction, and both ends of the axial reinforcement belt are respectively the outer circumferences of the axial ends of the stretchable cover. Fixed to both pipes , The protective cover has adopted a configuration in which the telescopic tube is connected to the two pipe members even when detached from the tube is maintained.

  According to this configuration, the protective cover is fixed to the tubular body integrally with the expansion cover at the overlapping portion with the expansion cover. The protective cover can be provided with “sag”.

In this configuration, when the expansion cover is fixed to the outer periphery of an annular fixture provided on the outer periphery of the two tubular bodies, both end portions of the axial reinforcing belt are respectively in the axial direction of the expansion cover. The both ends of the axial reinforcing belt are fixed to the two tubular bodies by being locked to a fixing member surrounding the outer periphery of both ends and tightening the fixing member toward the inner diameter side with respect to the outer periphery of the fixture. A configuration may be employed.
If a fixing method by tightening is adopted, the protective cover can be easily attached and detached.

  In addition, if the separation preventing means for preventing the two tubular bodies from moving away from each other is provided, it is possible to prevent the protective cover from being detached from the tubular body due to the deformation of the expansion / contraction cover.

Further, the protective cover can be directly fixed to the outer periphery of the pipe body.
That is, the configuration is such that the outer periphery of the expansion tube connecting the tubular bodies is covered with a flexible cylindrical expansion cover over the entire length in the axial direction, and the entire circumference of both ends in the axial direction of the expansion cover is respectively For a telescopic tube, which is fixed to a tubular body in a watertight manner so that when the telescopic tube is detached from the tubular body, the telescopic cover is deformed so that the connection between the two tubular bodies is maintained via the telescopic cover. In the water leakage prevention device, the outer periphery of the expansion / contraction cover is covered with a cylindrical protective cover, and the protective cover is a cylindrical fiber-shaped flat sheet portion, and a circumferential direction fixed to the sheet portion in a lattice shape It has an annular fiber reinforcing belt continuous with the entire circumference and a fiber reinforcing belt extending in the entire axial direction, and both ends of the axial reinforcing belt are respectively fixed to the outer periphery of each tubular body, The protective cover There was adopted a configuration in which the connection to the two pipe members are maintained even when detached from the tubular body.

  According to this configuration, since the protective cover is directly fixed to the pipe body, it is expected that the protective cover restrains the separation of the two pipe bodies at a predetermined position and prevents the two pipe bodies from further separating.

  In the configuration in which the protective cover is directly fixed to the tubular body, both end portions of the axial reinforcing belt are fixed to the outer periphery of the tubular body via fixing members attached to the outer periphery of the tubular body. It can be set as a structure.

In the configuration in which each of the fixing members is provided, as the fixing member, a plurality of arc-shaped saddle members along the outer peripheral surface of the tubular body are connected along the circumferential direction to form an annular shape, and the axial reinforcement The belt end portion is folded back in the axial direction to form a ring-shaped engaging portion, and the saddle member is inserted into the engaging portion so that the end portion is engaged with the fixing member. obtain.
If it does in this way, it will become easy to fix the both ends of the axial reinforcement belt to a pipe.

Further, the sheet portion of the protective cover is formed by winding a flat sheet into a cylindrical shape, and a plurality of circumferential reinforcing belts are fixed in parallel to the sheet, and the circumferential direction fixed to the sheet It is possible to employ a configuration in which the engaging portions are provided at both ends of the reinforcing belt and the engaging portions are engaged with each other so that the circumferential reinforcing belts are connected in an annular shape.
In this way, since the protective cover can be wound around and attached to the outer periphery of the pipe, for example, the protective cover can be easily added to the pipe line in service without removing and inserting the pipe body.

  In addition, the expansion / contraction tube leak prevention device having the above-described configuration can be used for expansion / contraction tubes in various uses of pipes installed in various places. For example, the present invention can be adopted for an expansion tube provided on the abutment of a tube bridge provided by connecting pipes between opposing abutments.

  In this invention, the protective cover of the expansion tube leakage prevention device is composed of a cylindrical resin sheet portion and circumferential and axial reinforcement belts fixed in a lattice shape to the sheet portion. The tension acting on the cover is reliably transmitted to the reinforcing belt. For this reason, the protective cover can exhibit a predetermined strength while suppressing an increase in thickness and weight of the entire protective cover.

(First embodiment)
A first embodiment will be described with reference to FIGS. In the water leakage prevention device of this embodiment, an expansion tube (expansion tube joint) 1 is provided on the abutment A of the water tube bridge B at the junction between the pipes p and p of the water pipe. The telescopic tube 1 allows a predetermined amount of axial expansion and contraction between the connected tubular bodies p and p.

As the telescopic tube 1, various known structures can be adopted, but in this embodiment, as shown in FIGS. 1 and 2, the outer periphery of the joint portion of the tubular bodies p and p is slightly more than the tubular body p. A large-diameter tube 1a is provided, and the sealing material 1b is fixed by a ring-shaped fixing member 1c (an expansion tube having another structure may be used).
As shown in FIG. 1, the telescopic tube 1 is normally fixed in a state where the butted tubes p, p are separated from each other by a distance t. When a large external force is applied when the pipe expands or contracts due to a temperature change, a slip occurs between the sealing material 1b and the fixing member 1c and the outer peripheral surface of the pipe body p, and the water pipe has its pipe axis. It can be expanded and contracted along the direction.

A cylindrical expansion cover 2 is attached so as to cover the outer periphery of the expansion tube 1. In the first embodiment, the extendable cover 2 is configured with a rubber sheet as a cylindrical shape.
In this embodiment, the fixture 3 for fixing both ends of the expansion / contraction cover 2 to the tube body p employs an annular member having an H-shaped cross section, and is fixed to the outer periphery of the tube body p by welding. Has been. The fixture 3 may be fixed to the outer peripheral surface of the tube body p by fastening or the like. The rubber sheet may be a tube formed in a cylindrical shape in advance, or one flat sheet may be wound once (see FIG. 4 (c)), or wound twice or more times. (See FIG. 4D) to form a cylinder. Further, two or more rubber sheets may be used in combination, and may be fixed by winding once or twice or more if necessary (see FIG. 4 (e)).

  The stretchable cover 2 is made of a flexible watertight rubber having flexibility and stretchability, and both axial end portions thereof are fixed to the fixture 3 via fastening members 6. As the tightening member 6, this embodiment employs a metal fixing band 30 as shown in FIGS. 3 and 4.

  As shown in FIG. 3, the fixing band 30 is composed of a flat metal sheet having a length L2 that is slightly shorter than the circumferential circumferential length L1 of the outer peripheral surface of the fixture 3 around which the stretchable cover 2 is wound. The sheet part 31 having a rectangular shape in plan view and the engaging parts 32a, 32b, 33a, 33b fixed to the sheet part 31 are provided.

  The engaging portions 32a, 32b, 33a, 33b are formed by folding the metal sheet made of the same material as the sheet portion 31 in half and joining the overlapped metal sheets by welding or the like. An annular portion is formed.

Of the locking portions 32a, 32b, 33a, and 33b, the locking portions 32a and 33a are fixed to the sheet portion 31 so as to protrude outward in the length L2 direction, and are orthogonal to the length L2 direction. Are provided in a comb shape that is cut at three and four locations at equal intervals. Further, the locking portions 32b and 33b are fixed to the inside in the length L2 direction with respect to the locking portions 32a and 33a, respectively, and are equally spaced at three positions and four positions in a direction orthogonal to the length L2 direction. It is provided as a comb shape cut into the.
In a state where the rectangular sheet portion 31 is wound into a cylindrical shape, the locking portions 32a and 32b and the locking portions 33a and 33b are opposed to each other with a predetermined interval L3 in the circumferential direction (see FIG. 4 (b)).

  It is possible to freely set how many of the opposing locking portions 32a, 32b; 33a, 33b are provided in the direction perpendicular to the length L2 direction of the sheet portion 31, for example, 2 sets, 3 sets, respectively. You can also

  The engaging portions 32a and 32b and the engaging portions 33a and 33b are connected in the circumferential direction by joint metal fittings 34 and 35 each including connecting pins 34a and 34b; 35a and 35b and bolt shafts 34c and 35c. In the figure, symbol a indicates a bolt insertion hole having a female screw groove, symbol b indicates a bolt insertion hole having no screw groove, and symbol c indicates a counterbore that fits the heads of the bolt shafts 34c and 35c. The connecting pins 34b and 35b may be semicircular with only the bolt insertion hole b and no counterbore c.

The distances L3 and L3 between the connecting pins 34a and 34b and the connecting pins 35a and 35b of the joint fittings 34 and 35 are set to arbitrary lengths within a predetermined range by adjusting the screwing degree of the bolt shafts 34c and 35c, respectively. can do. For this reason, the degree of tightening of the telescopic cover 2 with respect to the outer peripheral surface of the fixture 3 can be adjusted by rotating the bolt shafts 34c and 35c around the axis. Further, the water tightness of the entire circumference of the rubber sheet can be ensured by overlapping a part of the sheet portion 31.
The fixing band 30 is divided into a plurality in the circumferential direction, and the locking portions 32a and 32b; 33a and 33b are provided in the divided fixing bands 30 and 30, respectively, and the locking portions 32a and 32b facing each other. And 33a and 33b may be connected in the circumferential direction by the joint fittings 34 and 35, respectively.

  A cylindrical protective cover 40 is provided so as to cover the outer periphery of the extendable cover 2 (see FIG. 5). As shown in FIG. 5, the protective cover 40 is a flat sheet-like sheet (sheet part 41) having a rectangular shape in plan view, and reinforcing belts 42, 44 fixed to the sheet part 41 in a lattice shape. And have. The seat portion 41 and the reinforcing belts 42 and 44 are each made of aramid fiber or the like.

  The seat 41, the reinforcing belts 42 and 44, and the reinforcing belts 42 and 44 are fixed to each other by sewing at the overlapping portions. The fixing method by sewing may be resin impregnation adhesion, welding, or the like.

  As shown in FIG. 6A, the sheet portion 41 made of a flat sheet is provided on both end portions 42a and 42a of the reinforcing belt 42 after being wound in a cylindrical shape on the outer diameter side of the extendable cover 2, respectively. The formed locking portions (locking holes) 42b and 42b are connected in an annular manner in the circumferential direction by a joint fitting 43 including connecting pins 43a and 43b and a connecting plate 43c, respectively (see FIG. 6B). The locking portions 42b and 42b are formed by forming the annular portion by folding the tip of each end portion 42a and 42a of the reinforcing belt 42 and folding it into two, and joining the overlapped portions by sewing, welding or the like. is there.

  Note that the joining metal fitting 43 may be provided with a function of extending the distance between the connecting pins 43a and 43b, such as the joining metal fittings 34 and 35. If the distance between the connecting pins 43a and 43b can be extended, the reinforcing belt 42 can be tightened toward the inner diameter side.

  Further, the reinforcing belt 44 extends in the tube axis direction in a state where the sheet portion 41 is wound around the outer diameter side of the extendable cover 2, and both end portions 44a and 44a of the reinforcing belt 44 extending in the tube axis direction. The locking portions (locking holes) 44b and 44b are respectively locked to fixing rings 45 attached to the outer periphery of the fixture 3 with the elastic cover 2 sandwiched therebetween (see FIG. 7A).

  Each of the locking holes 44b and 44b is formed by folding the tip of each of the end portions 44a and 44a into two, and joining the overlapped portions by sewing or the like to form an annular portion.

As shown in FIGS. 7B and 7C, the fixing ring 45 is formed by connecting three arcuate saddle members 45a along the outer peripheral surface of the tubular body p along the circumferential direction to form an annular shape. . The saddle members 45 a and 45 a adjacent to each other in the circumferential direction are fixed by bolts 45 c and nuts inserted through the opposing flange portions 45 b and 45 b, and the fixing ring 45 is fastened to the outer periphery of the fixture 3. By this tightening, the protective cover 40 is fixed to the pipe body p. The number of saddle members 45a can be set freely.
Since the fixing ring 45 is divided into a plurality of saddle members 45a, the operation of locking the locking hole 44b to the fixing ring 45 is easy. In this embodiment, the fixing ring 45 is divided into a plurality of saddle members 45a. However, the fixing ring 45 may be fixed with a string-like member such as a wire or a chain.

Further, as shown in FIGS. 1 and 2, both the fixtures 3 and 3 are connected by a separation preventing means 20.
The structure of the separation preventing means 20 is such that a joint fitting 21 made of a pair of metal plates protruding inward in the axial direction is fixed to the both fixtures 3 and 3 with bolts 21a. Another bolt 21b is screwed inward. Both ends of the rope 22 made of an aramid fiber are locked to the bolts 21b and 21b in a somewhat slack state so as to connect the bolts 21b and 21b.

  Explaining the action of this water leakage prevention device, when the pipes p and p are pulled in opposite directions due to an earthquake or the like, and the telescopic pipe 1 and the pipes p and p are removed, the telescopic cover 2 expands or contracts. While being deformed so as to be bent in the radial direction, the connected state of both pipes p and p is maintained.

In particular, when the pipes p and p are pulled in directions opposite to each other, the separation preventing means 20 faces the tensile force and prevents the pipes p and p from being further separated from each other. The cover can be prevented from being detached from the tube.
In addition, when the internal pressure in the pipes p and p becomes high, the telescopic cover 2 rises radially outward and tries to push the fixing band 30 outward in the pipe axial direction. For this reason, in order to prevent the fixing band 30 from being detached from the fixing tool 3, as shown in FIGS. 4A and 7A, a drop prevention tool 37 for preventing the fixing band 30 from dropping is provided. You may provide in the fixing tool 3 or the pipe body p.

  At this time, the protective cover 40 restrains the rubber expansion / contraction cover 2 from expanding to the outer diameter side due to water pressure when water leaks from the expansion / contraction tube 1 or when the expansion / contraction tube 1 is detached from the tubular body p. This protects the telescopic cover 2. For this reason, breakage of the elastic cover 2 can be prevented.

Further, since the seat portion 41 and the reinforcing belts 42 and 44 constituting the protective cover 40 and the reinforcing belts 42 and 44 are fixed to each other at the overlapping portions, the protective cover 40 is attached to the protective cover 40. Most of the large force acting is borne by the reinforcing belts 42 and 44 extending vertically and horizontally.
That is, the tension generated in the entire protective cover 40 is caused by the binding portion of the reinforcing belts 42 and 44 (the locking portion to the fixing ring 45, the fixing portions of the reinforcing belts 42 and 44 at the mutual lattice points, the reinforcing belts 42 and 44, Therefore, if the reinforcing belts 42 and 44 have a predetermined strength, the seat portion 41 is not required to have a great strength. For this reason, the protective cover 40 as a whole can exhibit a predetermined strength while suppressing an increase in thickness and weight of the seat portion 41.

  In this embodiment, each of the locking portions 42b, 42b of the reinforcing belt 42 is formed in a ring shape by bending the tip of each reinforcing belt. However, the present invention is not limited to this embodiment, and the engagement is composed of other configurations. A stop may be employed. For example, the engaging portions 42b and 42b may be hook-like ones that engage with each other, or may be configured to be connected in an annular shape by tying the engaging portions 42b and 42b with a string. .

Further, as the locking portion 44b of the reinforcing belt 44, a hook-shaped member that can lock the end portion 44a of the reinforcing belt 44 to the fixing ring 45 may be adopted instead of the locking hole 44b. Similarly to the above, the end 44a of the reinforcing belt 44 and the fixing ring 45 may be tied and locked with a string.
In addition, the separation preventing means 20 (the rope 22 or the like) can be appropriately omitted as necessary.

(Second embodiment)
A second embodiment will be described with reference to FIGS. In the water leakage preventing device of this embodiment, the protective cover 10 is directly fixed to the outer circumferences of both pipes p and p via a fixing ring 15. Other configurations are the same as those of the above-described embodiment, and thus description thereof is omitted.

  As shown in FIGS. 8 and 9, the telescopic cover 2 maintains watertightness at the outer ends of the fixtures 3 and 3 attached to the outer peripheries of the tubular bodies p and p at both ends in the axial direction of the telescopic cover 2. Is fixed.

  The stretchable cover 2 is made of flexible, stretchable soft watertight rubber, and both axial end portions thereof are fixed to the fixture 3 via fastening members 6 and 6, respectively. Yes. As the respective fastening members 6 and 6, in this embodiment, metal fixing bands 30 and 30 are employed as in the above-described embodiment.

  Further, as shown in FIG. 11, the configuration of the protective cover 10 is substantially the same as the protective cover 40 of the above-described embodiment. As shown in FIG. 12A, the sheet portion 11 made of a flat sheet is provided on both ends 12 a and 12 a of the reinforcing belt 12 after being wound in a cylindrical shape on the outer diameter side of the extendable cover 2. The latching portions (locking holes) 12b and 12b are connected in a ring shape in the circumferential direction by the joint fitting 13 including the connecting pins 13a and 13b and the connecting plate 13c, respectively (see FIG. 12B). The configuration of the joint fitting 13 is the same as that of the joint fitting 43.

  The reinforcing belt 14 extends in the tube axis direction in a state where the sheet portion 11 is wound around the outer diameter side of the extendable cover 2, and both end portions 14a, 14a of the reinforcing belt 14 extending in the tube axis direction. This is also the same in that the locking portions (locking holes) 14b and 14b are locked to the fixing rings 15 attached to the outer peripheries of the pipes p and p, respectively (see FIG. 10).

  As shown in FIGS. 13 and 14, the fixing ring 15 is formed by connecting three arcuate saddle members 15 a along the outer peripheral surface of the tubular body p along the circumferential direction to form an annular shape. The saddle members 15a and 15a adjacent in the circumferential direction are fastened by bolts 15c and nuts inserted through the opposing flange portions 15b and 15b, and are fixed with a gap between the outer periphery of the tubular body p. The number of saddle members 15a can be set freely. Moreover, you may fix with a string-like thing as mentioned above.

  The fixture 3 for fixing the telescopic cover 2 is provided to protrude from the outer peripheral surface of the tubular body p by a certain height in the outer diameter direction over the entire circumference, and the inner diameter of the fixing ring 15 is It is set to have a smaller diameter than the outer diameter of the telescopic cover fixture 3. The fixing ring 15 can also be fixed in a state where it is pressed against the outer peripheral surface of the tube body p.

  Explaining the action of this water leakage prevention device, when the pipes p and p are pulled in opposite directions due to an earthquake or the like, and the telescopic pipe 1 and the pipes p and p are removed, the telescopic cover 2 expands or contracts. While being deformed so as to be bent in the radial direction, the connected state of both tubular bodies p and p is maintained (see FIG. 16B of the conventional example).

  In particular, when the pipes p and p are pulled in directions opposite to each other, the fixing ring 15 contacts the axially outer end surface of the fixture 3 so that the pipes p and p are further axially moved. It is blocked from leaving. Further, the separation preventing means 20 (the rope 22) also plays the same role.

  At this time, the protective cover 10 restrains the rubber expansion / contraction cover 2 from expanding to the outer diameter side due to water pressure when water leaks from the expansion / contraction tube 1 or when the expansion / contraction tube 1 is detached from the tube body p. This protects the telescopic cover 2. For this reason, breakage of the elastic cover 2 can be prevented.

  Further, since the protective cover 10 holds the pipes p and p so as not to be separated from each other, a large force does not act on the inner / outer telescopic cover 2. For this reason, breakage of the elastic cover 2 can be prevented.

Further, since the seat portion 11 and the reinforcing belts 12 and 14 constituting the protective cover 10 and the reinforcing belts 12 and 14 are fixed to each other at the overlapping portions, the expansion tube 1 is connected to the tube. Most of the large force acting on the protective cover 10 when the bodies p and p are removed is borne by the reinforcing belts 12 and 14 extending vertically and horizontally.
That is, the tension generated in the entire protective cover 10 is caused by the binding portion of the reinforcing belts 12 and 14 (the locking portion to the fixing ring 15, the fixing portions of the reinforcing belts 12 and 14 at the lattice points of each other, and the reinforcing belts 12. , 14 and the fixing portion of the seat portion 11), if the reinforcing belts 12 and 14 have a predetermined strength, the seat portion 11 is not required to have a great strength. Therefore, the protective cover 10 as a whole can exhibit a predetermined strength while suppressing an increase in thickness and weight of the seat portion 11.

  In this embodiment, each of the locking portions 12b and 12b of the reinforcing belt 12 is formed in a ring shape by bending the tip of each reinforcing belt, but for example, as in the case of the first embodiment, for example, the locking portion The hooks 12b and 12b may be engaged with each other, or may be configured such that both the locking portions 12b and 12b are connected in a ring shape by tying them with a string.

  Similarly, as in the case of the first embodiment, as the locking portion 14b of the reinforcing belt 14, the end portion 14a of the reinforcing belt 14 can be locked to the fixing ring 15 instead of the locking hole 14b. A hook-shaped thing may be employ | adopted and it is good also as a structure which ties the edge part 14a of the reinforcement belt 14, and the fixing ring 15 by a string, and is locked like the above. Further, a configuration in which the locking portion 14a is directly locked to the tube body p without using the fixing ring 15 (for example, an aspect in which a fixing hook is welded to the outer periphery of the tube body p) is also conceivable. Note that the rope 22 may be omitted as appropriate.

Cross-sectional view of the first embodiment 1 is an enlarged view of the main part (A) is a plan view of the fastening member of the telescopic cover, (b) is a front view of the same, and (c) is a detailed view of the connection fitting for the fastening member. (A) The perspective view which shows the state which attached the expansion-contraction cover and the fastening member to the outer periphery of an expansion-contraction pipe, (b) is sectional drawing of (a), (c) (d) (e) is the structure of an expansion-contraction cover, respectively. Schematic shown A protective cover is shown, (a) is a plan view, (b) is a front view, and (c) is a side view. (A) is sectional drawing which shows the state at the time of attaching a protection cover to the outer periphery of an expansion-contraction cover, (b) is a side view which shows the state after attachment, (c) is when connecting the circumferential reinforcement belt. Detailed view of the fittings used The perspective view which shows the form which attached the protective cover Side view showing form with protective cover attached Enlarged view of main part of fixing ring Cross-sectional view of the second embodiment Fig. 8 is an enlarged view of the main part. Perspective view of the second embodiment A protective cover is shown, (a) is a plan view, (b) is a front view, and (c) is a side view. (A) is sectional drawing which shows the state at the time of attaching a protection cover to the outer periphery of an expansion-contraction cover, (b) is a side view which shows the state after attachment, (c) is when connecting the circumferential reinforcement belt. Detailed view of the fittings used Side view showing the state with the fixing ring attached The perspective view which shows the state which attached the fixing ring Cross section of conventional example (A) (b) is sectional drawing which shows the laying state of the water pipe bridge of a prior art example

Explanation of symbols

1 Expansion tube (Expansion tube joint)
2 Extendable cover 3 Fixing tool 6 Tightening member 10, 40 Protective cover 11, 41 Sheet part 12, 14, 42, 44 Reinforcing belt 12 a, 14 a, 42 a, 44 a End part 12 b, 42 b Locking part (locking hole)
13, 34, 35, 43 Joint fittings 14b, 44b Locking portion (locking hole)
15, 45 Fixed ring 15a, 45a Saddle member 20 Separation prevention means 30, 30a, 30b Fixed band A Abutment B Water pipe bridge (tube bridge)
p tube

Claims (8)

The outer periphery of the expansion / contraction tube 1 that connects the pipes p, p is covered with a tubular expansion / contraction cover 2 having flexibility over the entire length in the axial direction, and the entire circumferences of both ends in the axial direction of the expansion / contraction cover 2 are respectively described above. The pipes p and p are fixed in a watertight manner, and when the telescopic tube 1 is detached from the pipe body p, the telescopic cover 2 is deformed, so that both the pipes p and p are interposed via the telescopic cover 2. In the water leakage prevention device for telescopic pipes designed to maintain the connection,
The outer periphery of the stretchable cover 2 is covered with a cylindrical protective cover 40, and the protective cover 40 is a cylindrical flat sheet portion 41 made of a fiber and a circumferential direction fixed to the sheet portion 41 in a lattice shape It has an annular fiber reinforcing belt 42 that continues around the entire circumference and a fiber reinforcing belt 44 that extends in the entire axial direction, and both end portions 44a, 44a of the axial reinforcing belt 44 are respectively connected to the telescopic cover 2. Are fixed to the pipes p and p at the outer periphery of both ends in the axial direction, and the protective cover 40 maintains connection to the pipes p and p even when the telescopic pipe 1 is detached from the pipe p. Stretchable tube leak prevention device characterized by being made.   The extendable cover 2 is fixed to the outer periphery of an annular fixture 3 provided on the outer periphery of the pipes p, p, and both end portions 44a, 44a of the axial reinforcing belt 44 are respectively connected to the extendable cover. 2 is engaged with a fixing member 45 that surrounds the outer periphery of both end portions in the axial direction, and the fixing member 45 is tightened toward the inner diameter side with respect to the outer periphery of the fixing device 3 so that both end portions 44a, 44a, 44. The telescopic tube water leakage prevention device according to claim 1, wherein 44a is fixed to both the pipes p and p.   The expansion / contraction tube water leakage prevention device according to claim 1 or 2, further comprising a separation prevention means (20) for preventing the pipes (p, p) from moving in a direction away from each other. The outer periphery of the expansion / contraction tube 1 that connects the pipes p, p is covered with a tubular expansion / contraction cover 2 having flexibility over the entire length in the axial direction, and the entire circumferences of both ends in the axial direction of the expansion / contraction cover 2 are respectively described above. The pipes p and p are fixed in a watertight manner, and when the telescopic tube 1 is detached from the pipe body p, the telescopic cover 2 is deformed, so that both the pipes p and p are interposed via the telescopic cover 2. In the water leakage prevention device for telescopic pipes designed to maintain the connection,
The outer periphery of the extendable cover 2 is covered with a cylindrical protective cover 10, and the protective cover 10 is a cylindrical flat sheet portion 11 made of a fiber and a circumferential direction fixed to the sheet portion 11 in a lattice shape. It has an annular fiber reinforcing belt 12 continuous over the entire circumference and a fiber reinforcing belt 14 extending in the entire axial direction, and both end portions 14a, 14a of the axial reinforcing belt 14 are respectively connected to the pipes. The expansion and contraction tube is fixed to the outer periphery of p and p, and the protective cover 10 maintains the connection to both the tubes p and p even when the expansion and contraction tube 1 is detached from the tube p. Water leakage prevention device.   Both end portions 14a and 14a of the reinforcing belt 14 in the axial direction are fixed to the outer circumferences of the pipe bodies p and p via fixing members 15 attached to the outer circumferences of the pipe bodies p and p, respectively. The expansion / contraction tube water leakage prevention device according to claim 4, characterized in that:   The fixing members 45, 15 are formed by connecting a plurality of arcuate saddle members 45a, 15a along the circumferential direction into an annular shape, and the end portions 44a, 14a of the axial reinforcing belts 44, 14 are shafts. Folded in the direction to form ring-shaped locking portions 44b and 14b, and when the saddle members 45a and 15a are inserted into the locking portions 44b and 14b, the end portions 44a and 14a are fixed to the fixing member. The expansion / contraction tube water leakage prevention device according to claim 2, wherein the expansion tube water leakage prevention device is latched by 45 and 15.   The sheet portions 41 and 11 are formed by winding a flat sheet into a cylindrical shape, and a plurality of the circumferential reinforcing belts 42 and 12 are fixed in parallel to the sheet, and the periphery fixed to the sheet Locking portions 42b, 42b; 12b, 12b are respectively provided at both ends 42a, 42a; 12a, 12a of the reinforcing belts 42, 12 in the direction, and the locking portions 42b, 42b; 12b, 12b are locked with each other. The expansion / contraction tube water leakage prevention device according to any one of claims 1 to 6, wherein the circumferential reinforcing belts (42, 12) are connected in an annular shape.   The said expansion-contraction pipe | tube 1 is provided on the said abutment A of the bridge B provided by connecting between the abutment A and A with the pipe body p, The any one of Claim 1 thru | or 7 characterized by the above-mentioned. The expansion tube leak prevention device according to crab.

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