JP4343005B2 - Flexible tube device - Google Patents

Description

  The present invention relates to a flexible pipe device connected between a rigid pipe such as a steel pipe or cast iron pipe when a pipe such as water and sewage is laid.

  For example, many underground facilities such as water pipes, sewers or gas pipes, electric cables and the like are buried in roads, and manholes are installed at appropriate intervals for cleaning and maintenance, for example. . Therefore, in plumbing work such as water pipes, work for laying conduits is often performed bypassing existing buried obstacles. In factories and the like, exposed pipes such as fuel supply pipes, cooling pipes, air conditioning and heating pipes, and raw material transport pipes are laid in the site and buildings. Therefore, even in factories and the like, when these pipes are newly piped, work is often performed to bypass existing facilities and pipes.

  For example, in the case of piping a water pipe, when an obstacle such as a sewage manhole is present in the water pipe laying path, a flexible pipe device as shown in Patent Document 1 below is used. The flexible tube device described in Patent Document 1 is formed by winding a blade around a bellows tube, and is flexible enough to be bent by an operator. Therefore, according to this flexible pipe device, the plumbing of the water pipe can be performed very quickly and easily. In conventional piping work, obstructions are bypassed by combining a regular curved pipe having a specified bending angle such as 90 °, 45 °, 22.5 °, 11.25 ° and a straight pipe. When the flexible tube apparatus is used, the conventional regular curved pipe is not required, and the bending work of the flexible tube apparatus is easy, so that the piping work can be performed quickly and easily.

  Moreover, when water pipes having rigidity such as steel pipes and cast iron pipes are buried in the ground, it is necessary to absorb the deviation when subsidence or the like occurs. Since the flexible tube device shown in Patent Document 1 described above uses a bellows tube, it can also be used for displacement absorption when ground subsidence or the like occurs due to the stretchability of the bellows tube.

  Specifically, as shown in FIG. 10, the flexible tube device 100 disclosed in Patent Document 1 is wound around a bellows tube 101, a connection tube 102 connected to both ends of the bellows tube 101, and an outer peripheral portion of the bellows tube 101. And a blade 103 to be rotated. The blade 103 is for preventing expansion and local deformation of the bellows tube 101, and both ends of the bellows tube 101 are pressed by blade pressing rings 104. A rust preventive tape 105 is wound around the outer periphery of the blade 103, and further a protective tape 106 is wound. The rust preventive tape 105 and the protective tape 106 are attached to both ends of the bellows tube 101 by stopper rings 107. Both ends are fixed.

  The bellows tube 101 is integrally provided with fitting end portions 101b fitted to the connecting tube 102 at both ends of a bellows main body 101a provided with uneven bellows continuously. When the connecting pipe 102 is fitted to the outer peripheral part of the fitting end part 101b, the inner peripheral surface of the connecting pipe 102 and the tip end part of the fitting end part 101b are welded (the welding location is indicated by 110a in FIG. 10). .) A neck ring 108 is welded to the outer periphery of the connecting pipe 102 to which the fitting end 101b is connected. The neck ring 108 is brought into contact with the outer surface of the outermost convex portion 101c of the bellows tube 101, and the inner peripheral portion thereof is welded to the end portion of the connecting tube 102 (the welding location is indicated by 110b in FIG. 10). . Further, the outer peripheral portion of the neck ring 108 is welded to the end portion of the blade 103 and the blade pressing ring 104 (a welding portion is indicated by 110c in FIG. 10).

  Thus, the fitting end portion 101b of the bellows tube 101 and the connecting tube 102 are integrally connected at the welding location 110a. Further, the blade 103 wound around the outer periphery of the bellows tube 101 is pressed against the bellows tube 101 by a blade pressing ring 104, and further, the neck ring 108 whose inner periphery is welded to the connection tube 102 at the welding location 110b. Are welded to the end portion of the blade 103 and the blade pressing ring 104 by a welding portion 110c, and the connecting tube 102 is welded to the fitting end portion 101b, thereby being fixed to the bellows tube 101.

  The blade 103 is formed by weaving a strip-shaped thin metal plate in a mesh pattern or by woven a metal wire in a mesh pattern. Therefore, the blade 103 has a certain degree of elasticity, and the elasticity allows the bellows tube 101 to be bent. However, the length is basically the same as that of the bellows main body 101a of the bellows tube 101, and is fixed to both ends of the bellows tube 101 as described above.

  The flexible tube device 100 as described above is relatively easy to bend when the bellows tube 101 is thin and long, but when it is thick and short, it requires a large force to bend compared to a thin and long one and is difficult to bend. Further, the flexible tube device 100 has a greater resistance force as the bending radius is smaller, and requires a larger force to bend.

This will be described more specifically. In a long member such as the bellows tube 101, a tube axis (center axis) passing through the center of the cross section is a neutral axis. Therefore, the length of the neutral shaft of the bellows body 101a is the same before and after bending. As shown in FIG. 11A, when the bellows tube 101 is not straight and bent in the bellows tube 101 alone in which the blade 103 is not wound, the length of the tube axis TA which is a neutral shaft in the bellows body 101a. LB _TA is the same as the original length LB of the bellows body 101a. As shown in FIG. 11B, when the bellows tube 101 is bent by a predetermined angle θ, the outer peripheral length LB _OUT of the bent bellows main body 101a becomes the tube axis TA that has become a neutral axis by extension. longer than the length _{LB TA} of the length _{LB iN} of the inner circumference, the shrinkage becomes shorter than the length _{LB TA} in the tube axis TA that is the neutral axis.

That is, the length LB _TA of the tube axis TA when the bellows body 101a is bent so that the bending angle is θ is expressed by the following formula 1.

Further, the length LB _OUT of the outer periphery of the bellows body 101a when the bellows body 101a is bent so that the bending angle is θ is expressed by the following formula 2.

That is, the length _{LB OUT} of the outer periphery of the bellows body 101a is different from the length _{LB TA} of the tube axis TA of the bellows body 101a, is longer by (D / 2) πθ / 180 .

Furthermore, the length LB _IN of the inner periphery of the bellows body 101a when the bellows body 101a is bent so that the bending angle is θ is expressed by the following equation (3).

That is, the length _{LB IN} inner periphery of the bellows body 101a is different from the length _{LB TA} of the tube axis TA of the bellows body 101a, shortened by (D / 2) πθ / 180 .

The blade 103 alone has the following bending characteristics with respect to the bellows tube 101 having the above bending characteristics. Hereinafter, a case where the blade 103 is a wire blade formed by weaving metal wires in a mesh shape will be described as an example. Since the blade 103 is a woven fabric, since each structure composed of wires is integrated, resistance to elongation is large. Therefore, the blade 103 does not behave like the bellows tube 101 when bent. As shown in FIG. 12A, when the blade 103 is straight and not bent, the length LW _CL of the central axis _CL and the original length LW of the blade 103 are the same. However, as shown in FIG. 12B, when the blade 103 is bent by a predetermined angle θ, the outer peripheral length LW _OUT of the blade 103 becomes the same as the original length LW of the blade 103. The length LW _CL of the center axis CL of the inner blade 103 is shorter than the outer length LW _OUT of the blade 103, and the inner length LW _IN of the inner blade 103 is equal to the length of the center axis CL. It becomes shorter than LW _CL . That is, in the bellows body 101a, the length LB _TA of the tube axis TA, which is a neutral axis, is the same as the original length LB of the bellows body 101a before and after the bending, whereas the blade 103 Thus, the length LW _CL of the central axis CL is different, and the original length LW of the blade 103 is the same as the outer peripheral length LW _OUT . This is because, since the blade 103 is a woven fabric and the respective tissues are integrated, the length does not change on the outer periphery to which a force in the extending direction is applied, and wrinkles are generated inside.

That is, the length LW _OUT of the outer periphery when the bending angle of the blade 103 itself is bent so that θ becomes the following Expression 4.

  The diameter D of the blade 103 is not considered here because the wire diameter (0.2 mm to 1.0 mm) of the wire constituting the blade 103 is extremely small as compared with the outer shape of the blade 103. Same as diameter.

Further, the length LW _CL of the central axis CL when the blade 103 is bent so that the bending angle becomes θ is a bending radius shorter than the outer circumference of the bent blade 103, and is expressed by the following equation (5).

That is, the length LW _CL of the central axis CL when the blade 103 is bent by θ is shorter than the outer peripheral length LW _OUT (= LW) by (D / 2) πθ / 180.

Further, the length LW _IN inner circumference of the blade 103 at the time when the bending angle of the blade 103 itself is bent such that θ is half diameter becomes shorter bend radius than the length LW _CL of the center axis CL of the blade 103, the following Equation 6 is obtained.

That is, the inner peripheral length LW _IN of the blade 103 is shorter than the outer peripheral length LW _OUT (= LW) by Dπθ / 180.

  The flexible tube device 100 shown in FIG. 10 in which the blade 103 having the above bending characteristics is wound around the bellows body 101 a of the bellows tube 101 and both ends of the blade 103 are fixed to the bellows tube 101 is the bending property of the bellows tube 101. Instead, it is governed by the bending characteristics of the blade 103. That is, the original length LB of the bellows main body 101a and the original length LW of the blade 103 are the same as shown in FIG. 13A when the flexible tube device 100 shown in FIG. 10 is not bent. . However, when the flexible tube device 100 shown in FIG. 10 is bent so that the bending angle becomes θ as shown in FIG. 13B, the blade 103 is wound around the bellows body 101a and fixed to both ends. Therefore, the length of the tube axis TA and the length of the outer periphery are based on the equations 4 to 6 expressing the bending properties of the blade 103, regardless of the equations 1 to 3 expressing the bending properties of the bellows tube 101. The length of the inner circumference and the inner circumference will change.

Therefore, when the flexible tube device 100 shown in FIG. 10 is bent so that the bending angle becomes θ, the length LB _TA of the tube axis TA of the bellows body 101a around which the blade 103 is wound and fixed is the bellows body 101a. Is shorter than the original length LB by (D / 2) πθ / 180 shown in Equation 5 above, and the inner peripheral length LB _IN is shown in Equation 6 above from the original length LB of the bellows body 101a. Shortened by Dπθ / 180. In other words, the bellows main body 101a is compressed and compressed by (D / 2) πθ / 180 on the tube axis TA when the blade 103 is wound and fixed. Further, the inner peripheral length LB _{IN of} the bellows main body 101a is also compressed and compressed. The force when the bellows main body 101a is compressed becomes the largest resistance force applied to the operator when the flexible tube device 100 shown in FIG. 10 is bent, leading to difficulty in bending the operator. Therefore, it is better that this resistance is small from the viewpoint of workability.

As described above, the flexible tube device 100 shown in FIG. This will be described with reference to Equation 5 above. The second term on the right side increases proportionally as the outer diameter D of the blade 103 increases. Accordingly, the length _{LB TA} of the tube axis TA of the bellows body 101a is, as the outer diameter D is large, shortened, the amount of compression is increased. Accordingly, the flexible tube device 100 shown in FIG. 10 becomes more difficult to bend as the outer diameter D increases.

  Further, the flexible tube device 100 shown in FIG. This will be described with reference to the above equations 1 and 5. As shown in Equation 1, when it is attempted to obtain the same bending angle by shortening the original length LB (= LW) of the bellows main body 101a, it is necessary to reduce the bending radius R. When the bending radius R is reduced, the first term on the right side of Equation 5 becomes smaller as the bending radius R becomes smaller. On the other hand, the second term on the right side of Formula 5 indicating the compression amount does not change. Therefore, the ratio of the compression amount of the bellows main body 101a to the length LB of the bellows main body 101a increases as the length LB of the bellows main body 101a decreases. In other words, as the compression ratio with respect to the original length LB of the bellows main body 101a is increased, the resistance force when the operator tries to bend is increased. For example, if the original length LB of the bellows body 101a is 10 and the compression amount is 1, the compression ratio is 10%, but the original length LB of the bellows body 101a is 5 and the compression amount is 1 without changing. If so, the compression ratio is 20%. Accordingly, even when the compression amount is the same, the higher the compression ratio, that is, the more the compression is required, the greater the resistance force when the operator tries to bend.

Furthermore, when the flexible tube device 100 shown in FIG. 10 is bent by the same angle, the bending radius R becomes smaller and the bending becomes difficult. That is, as shown in Equation 1, the original length LB of the bellows body 101a, in a state where no bend bellows body 101a, is the same as the length LB _TA of the tube axis TA that the neutral axis. Consider a case where the bending angle θ is the same and the bending radius R is reduced. Focusing on the first term on the right side of Equation 5, when the bending angle θ is the same and the bending radius R is small, the value becomes small and the value of the second term on the right side does not change. However, as described above, even when the compression amount is the same, as the compression ratio increases, the resistance force when the operator tries to bend the flexible tube device 100 shown in FIG. 10 increases.

  As described above, in the flexible tube device 100 shown in FIG. 10, the blade 103 is wound around the bellows main body 101a of the bellows pipe 101, and both ends are fixed. This is governed by the bending characteristics of the blade 103, not the characteristics, and when bent, the tube axis TA of the bellows body 101a is compressed, which becomes a resistance force against the operator during the bending work.

JP-A-11-71806

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a flexible tube that can be bent with a smaller force by further reducing the resistance to an operator who bends by hand during a bending operation. To provide an apparatus.

  Moreover, the objective of this invention is providing the flexible tube apparatus which enables it to perform piping work more easily and rapidly by enabling it to bend easily.

  The flexible tube device according to the present invention has the bending property of the bellows tube as a whole by allowing the blade to move relative to the bellows tube with at least one end of the blade wound around the outer periphery of the bellows tube as a free end. Can be bent. That is, a flexible tube device according to the present invention includes a bellows tube having a bellows body provided with a bellows, a blade wound around an outer peripheral portion of the bellows body so as to be movable in the tube axis direction of the bellows tube, and one end And a connecting pipe that is integrally connected to both ends of the bellows pipe and has the other end connected to the conduit.

  Neck members that are integrally attached to the outer periphery of the connecting pipe are disposed at both ends of the bellows body. The blade is formed longer than the bellows body, and a stopper member is integrally attached to a portion protruding from the outermost convex portion of the bellows body so as to face the neck member with a predetermined interval. Therefore, the blade is movable with respect to the bellows tube, and the movement is possible within a predetermined distance provided between the stopper member and the neck member.

  Here, the neck member protects the outermost convex portion of the bellows body, and may be abutted against the outermost convex portion of the bellows body or may be separated. When separated, the impact when the stopper member hits the neck member can be absorbed.

  One end of the blade may be fixed to the bellows tube and the other end may be a free end, or both ends may be free ends. If the flexible tube device according to the present invention is capable of moving the blade within a range of a value obtained by subtracting the length of the neutral axis of the bellows body from the length of the outer periphery of the bellows body at the assumed maximum bending, It can be bent according to the bending characteristics of the bellows tube without depending on the bending characteristics. Here, the assumed maximum bending amount is the maximum bending amount assumed by the manufacturer at the time of design or the like. Therefore, when one end of the blade is a fixed end and the other end is a free end, the predetermined interval is at least a value obtained by subtracting the length of the neutral axis of the bellows body from the length of the outer circumference at the assumed maximum bending of the bellows body. I need it. In addition, when both ends of the blade are free ends, the sum of the predetermined intervals provided at both ends of the bellows body subtracts the length of the neutral axis of the bellows body from the length of the outer circumference of the bellows body at the time of the assumed maximum bending. Any value is acceptable.

  The mounting relationship between the bellows pipe and the connecting pipe is as follows. That is, both ends of the bellows main body are provided with fitting end portions connected to the connection pipe, the fitting end portions are inserted into the connection pipe, and the fitting end portions and the inner peripheral surface of the connection pipe are welded. In addition, the connecting pipe and the neck member are integrated by welding. As a result, welding is not performed on the bellows body, and the strength is prevented from being reduced by distortion due to heat or the like during welding.

  Further, the mounting relationship between the bellows tube and the blade can be configured as follows. That is, one end of the connection pipe is welded to the opening formed at both ends of the bellows body. As a result, the bellows can be formed so that the inner diameter of the bellows main body, that is, the inner diameter at the bottom of the bellows coincides with the connecting pipe, and the flow of fluid flowing through the bellows can be prevented.

  According to the present invention, since the blade is movable with respect to the bellows body, it can be bent according to the bending characteristics of the bellows body, not the bending characteristics of the blade. Therefore, the resistance force against the operator can be further reduced and bending can be performed with a smaller force.

  Hereinafter, a water pipe piping system using a flexible pipe device to which the present invention is applied will be described with reference to the drawings. As shown in FIG. 1, the water pipe 1 is embed | buried in a public land and a private land. In addition to the water pipe 1, obstacles such as a gas pipe 2, a communication cable 3, a sewer pipe 4, and a sewage manhole 5 connected to the sewer pipe 4 are embedded in the road. The sewer pipe 4 is located deeper than the water pipe 1 in order to avoid the risk of mixing in the event of water leakage and to secure a flow gradient to the treatment plant. For example, a sewage manhole 5 is installed every 30 meters to be buried and cleaned in the pipe.

  The flexible pipe device 10 to which the present invention is applied, for example, when piping a water distribution pipe (water pipe main pipe) 1a embedded along a road, when bypassing a sewage manhole 5 serving as an obstacle in a horizontal direction. Can be used. In addition, the flexible pipe device 10 includes a gas pipe 2 that becomes an obstacle when a water supply pipe 1b when drawing into a private area from the water distribution pipe 1a or a water distribution pipe when crossing a pipe of another company, etc. It can be used when the communication cable 3 or the like is detoured in the depth direction. The flexible tube device 10 is laid in the excavated laying groove 6 along the outer periphery of the obstacle when detouring obstacles such as the sewage manhole 5, the gas pipe 2, and the communication cable 3, It is connected to the end portion of the water pipe 1 composed of a straight pipe or the like that is positioned close to the obstacle. Further, although not shown, the flexible tube device 10 is connected to the water distribution pipe 1a or the like at predetermined intervals, for example, every several tens to several hundreds of meters, and is also used for absorbing displacement when ground subsidence occurs. It is done. In addition, as the existing water pipe 1, a steel pipe, a cast iron pipe, a synthetic resin pipe made of vinyl chloride, or the like is used, but the flexible pipe device 10 can be connected to any kind of water pipe.

  The plumbing of the water pipe 1 is often performed on public land such as roads, and it is necessary to perform it within a predetermined time such as at night when traffic is low. Moreover, the laying groove | channel 6 for burying the water pipe 1 must be excavated within the range of the predetermined width and the predetermined depth prescribed | regulated by the rule. For example, as shown in FIG. 2, the laying groove 6 around the sewage manhole 5 includes a first peripheral region 6 a around the water pipe 1 laid in a straight line and a digging around the sewage manhole 5. 2 is excavated in the range of the peripheral region 6b. The water pipe 1 configured as a straight pipe is laid in the first peripheral area 6 a, and the flexible pipe device 10 is laid in the second peripheral area 6 b around the sewage manhole 5. The flexible tube device 10 is curved and connected to the end of the water pipe 1 that faces the vicinity of the sewage manhole 5 and along the outer periphery of the sewage manhole 5.

  The flexible tube device 10 to which the present invention is used as described above is wound around a bellows tube 11 having flexibility and stretchability and an outer peripheral portion of the bellows tube 11 as shown in FIG. A blade 12 and a pair of connecting pipes 13 integrally joined to both end portions of the bellows pipe 11 are provided.

  The bellows tube 11 is made of a stainless steel material having excellent mechanical properties and rust prevention, and a fitting end portion 11b serving as a connection portion for connecting to the connection tube 13 is connected to both ends of the bellows body 11a having a substantially corrugated cross section. It is provided integrally. The bellows tube 11 is flexible and stretchable so that an operator can bend it by hand depending on its shape and material characteristics, and has a sealing property. Since the flexible tube device 10 is an embedded tube, the bellows body 11a has a strength sufficient to withstand the force caused by the internal pressure of tap water flowing inside and the wheel load applied from the outside. Each convex part 11c which comprises the bellows of the bellows main body 11a is formed in the cross-sectional inverted U shape where the front-end | tip raises substantially circular arc, for example. By forming each convex part 11c into an inverted U-shaped cross section, it is less likely to be crushed than when it is formed into a substantially Ω-shaped cross section, and the strength is increased. In addition, as long as necessary strength is obtained by the plate thickness or the like, each convex portion 11c may have a substantially Ω cross section or other shapes.

  Further, the bottom of the concave groove formed by the convex portions 11c constituting the bellows of the bellows body 11 is not smaller than the inner diameter of the cylindrical fitting end portion 11b, that is, an extension line L1 of the fitting end portion 11a. It is formed so as not to be located further inside. By preventing the flow path of the bellows pipe 11 from becoming thinner than the fitting end portion 11a, the flow of tap water in the bellows main body 11a can be minimized, and pressure loss is kept to a minimum. be able to.

  The bellows pipe 11 is a bellows formed by compressing an element pipe formed of a stainless steel plate having a length approximately three times the length in the pipe axis direction, and then preventing stress cracking due to residual stress after the bellows is formed. For this purpose, a solution heat treatment is performed, and then the surface is subjected to acid cleaning to remove residues after the heat treatment. Since the bellows tube 11 is changed from an elastic body to a plastic body by this heat treatment, a restoring force unlike the elastic body is not generated, and when bent, the bent shape is maintained. The size of the sewage manhole 5 is defined by the standard. Therefore, for example, the bellows pipe 11 used for detouring the sewage manhole 5 is formed in a length that can detour the sewage manhole 5 according to the type of the sewage manhole 5. In addition, the manufacturing method of the bellows pipe | tube 11 is not limited to the above example, For example, you may abbreviate | omit heat processing and an acid treatment.

  In addition, about the bellows pipe | tube 11, it is not limited to a stainless steel material, For example, you may use what was formed with other appropriate metals, such as copper, titanium, an aluminum alloy, or a synthetic resin. Moreover, the bellows pipe | tube 11 may comprise the bellows main body 11a with the spiral pipe comprised from the continuous mountain other than what comprised the bellows with the single mountain. Further, the bellows tube 11 may be configured by conducting a flexible conduit inside to prevent solid matter from staying inside due to the uneven structure of the bellows and causing a clogging phenomenon.

  The blade 12 is mainly wound around the outer periphery of the bellows main body 11a along the tube axis direction, thereby preventing the bellows main body 11a from being elongated or locally deformed. The blade 12 is constituted by, for example, a ribbon blade formed by weaving a strip-shaped metal thin plate in a mesh shape, a wire blade formed by weaving metal wires in a mesh shape, or the like. The blade 12 is not particularly limited in material, configuration, or the like as long as it can prevent the bellows body 11a from being elongated or locally deformed. The blade 12 is formed to be longer than the bellows main body 11a, and has a length that reaches the fitting end portion 11b. In order not to impair the flexibility of the bellows tube 11, the blade 12 is wound around the bellows tube 11 here. The number of turns of the blade 12 may be multilayered by changing the thickness of the thin metal plate or the wire diameter of the metal wire depending on the construction conditions. The blade 12 is wound on the bellows main body 11a so as to be movable in the tube axis direction. Since the blade 12 is movable in the tube axis direction on the bellows main body 11a, it is possible to prevent the twist from occurring when the flexible tube device 10 is bent.

  The connecting pipe 13 is connected to each of the fitting end portions 11b at both ends of the bellows pipe 11 formed of a stainless steel material, and has an inner diameter substantially equal to the outer diameter of each fitting end portion 11b. Is the body. The other end 13 b of the connection pipe 13 is joined to the water pipe 1. The connecting pipe 13 has one end portion 13a fitted to the outer peripheral portion of the fitting end portion 11b of the bellows tube 11, and the tip end portion of the fitting end portion 11b and the inner peripheral surface thereof are welded, whereby the bellows tube 11 is connected. (The welded portion is indicated by 20a in FIG. 3).

  The other end 13b of the connecting pipe 13 attached to both ends of the bellows pipe 11 is an end connected to the water pipe 1, and the other end 13b is connected to the end of the water pipe 1. A loose flange mechanism 14 is provided. The loose flange mechanism 14 is rotatably attached to the connection pipe 13 in a state in which the loose flange mechanism 14 is prevented from coming off by a flange part 14 a that is formed on the other end 13 b of the connection pipe 13. A plurality of connection holes 14c are formed in the loose flange 14b. On the other hand, a similar loose flange mechanism 14 is also provided at the end of the water pipe 1 to which the connection pipe 13 is connected. When connecting the loose flange mechanism 14 of the flexible tube device 10 and the loose flange mechanism 14 of the water pipe 1, the flange portion 14 a of the connection pipe 13 and the flange portion 14 a of the water pipe 1 are brought into contact with each other via packing or the like. Next, the loose flange 14b of the connection pipe 13 and the loose flange 14b of the water pipe 1 are rotated so that the axes of the connection holes 14c and 14c coincide. Thereafter, the loose flange 14b of the connection pipe 13 and the loose flange 14b of the water pipe 1 are tightened by using a connecting member constituted by a bolt or a nut, whereby the connection pipe 13 and the water pipe 1 are connected. .

In addition, the mechanism for connecting the connecting pipe 13 and the water pipe 1 is not limited to the loose flange mechanism 14, for example, a detachment preventing mechanism as shown in Patent Document 1 is provided. it may be a variety of connection methods used for and generally wide.

As shown in FIGS. 3 and 4, the connection of the bellows tube 11, the blade 12, and the connection tube 13 at one end of the bellows tube 11 is first performed on the outer periphery of the fitting end portion 11 b of the bellows tube 11. 13 is fitted. Then, the inner peripheral surface of the connecting pipe 13 and the tip end portion of the fitting end portion 11b are welded (the welding location is indicated by 20a in FIGS. 3 and 4). Here, a neck ring 15 made of a metal material such as stainless steel is fitted to one end portion 13a of the connecting pipe 13 on the outer peripheral portion, and integrated with the inner peripheral portion of the neck ring 15 by welding ( The welding location is indicated by 20b in FIG. 3 and FIG. The neck ring 15 is a neck member that protects the end portion of the bellows body 11a by being abutted from the outside against the outermost convex portion 11d of the bellows body 11a when the fitting end portion 11b is fitted to the connecting pipe 13. , and the formed so as to be substantially flush with the respective convex portions 11c.

  In addition, as a neck member, you may comprise the tongue piece provided in the one end part 13a of the connection pipe 13 other than the neck ring 15 in one or more in the circumference direction of the connection pipe 13. As the neck member, when each convex portion 11c constituting the bellows is low, a metal tape such as a stainless steel ribbon is wound around the connecting tube 13 one or more times depending on the thickness of the tape, You may comprise so that it may become substantially the same height.

  The blade 12 wound around the bellows main body 11a is pressed by a ring-shaped blade pressing member 16 that protects the end of the blade 12 at one end of the bellows main body 11a. Specifically, the blade pressing member 16 aligns and presses the end portion so that the end portion of the blade 12 that is a fabric is not unwound and spreads. The outer peripheral portion of the neck ring 15 is welded to the end portion of the blade 12 and the blade pressing member 16 (the welding location is indicated by 20c in FIGS. 3 and 4). At one end of the bellows tube 11, the bellows tube 11 and the connection tube 13 do not directly weld the bellows body 11 a and the connection tube 13. That is, the bellows pipe 11 and the connecting pipe 13 are welded at a welded portion 20a where the fitting end portion 11b and the connecting pipe 13 overlap each other, and the strength of the bellows main body 11a is reduced due to distortion caused by heat or the like during welding. I try not to.

  The blade 12 is pressed against the end of the bellows main body 11a by the blade pressing member 16 at one end of the bellows main body 11a, and the inner ring is welded to the connecting pipe 13 at the welding location 20b. Is welded to the end portion of the blade 12 and the blade pressing member 16 by the welded portion 20c, and the connecting pipe 13 is welded to the fitting end portion 11b to be fixed to the bellows body 11a. Therefore, one end of the blade 12 is a fixed end fixed to one end of the bellows body 11a.

As shown in FIGS. 3 and 5, the connection tube 13 is connected to the outer periphery of the fitting end portion 11b of the bellows tube 11, as shown in FIGS. Mated. And the inner peripheral surface of the connection pipe 13 and the front-end | tip part of the fitting end part 11b are welded (a welding location is shown by 20a in FIG.3 and FIG.5). Here, the neck ring 15 is fitted to the outer peripheral portion of the one end portion 13a of the connecting pipe 13, and is integrated with the inner peripheral portion of the neck ring 15 by welding (the welding locations are shown in FIGS. 3 and 5). Middle 20b). The neck ring 15 is a neck member that protects the end portion of the bellows main body 11a by being abutted against the outermost convex portion 11d of the bellows main body 11a when the fitting end portion 11b is fitted to the connecting pipe 13. These are formed so as to have substantially the same height as each convex portion 11c. Also at the other end of the bellows tube 11, the bellows tube 11 and the connection tube 13 avoid welding directly between the bellows body 11a and the connection tube 13, and the fitting end portion 11b and the connection tube 13 are overlapped. It is made to weld at the location 20a so that the strength of the bellows body 11a does not decrease due to distortion caused by heat or the like during welding.

  As the neck member, as in the case of the structure of the one end portion of the bellows tube 11, a tongue piece provided on the one end portion 13 a of the connection tube 13 in addition to the neck ring 15 is provided in the circumferential direction of the connection tube 13. One or a plurality may be provided. As the neck member, when each convex portion 11c constituting the bellows is low, a metal tape such as a stainless steel ribbon is wound around the connecting tube 13 one or more times depending on the thickness of the tape, You may comprise so that it may become substantially the same height.

  As described above, the blade 12 is formed longer than the bellows main body 11a. Therefore, the other end of the blade 12 fixed to one end of the bellows main body 11a is the bellows at the other end of the bellows main body 11a. It protrudes from the main body 11a to the fitting end 11b side. A blade pressing member 16 that protects the other end portion of the blade 12 is attached to the other end portion of the blade 12 at the outer peripheral portion. The blade pressing member 16 also presses and aligns the end portion so that the end portion of the blade 12 that is a fabric does not unravel and spread. A ring-shaped stopper member 21 made of a metal material such as stainless steel is attached to the other end portion of the blade 12 and the blade pressing member 16 by welding (the welding location is indicated by 20d in FIGS. 3 and 5). Show.) The stopper member 21 faces the neck ring 15 abutted against the outermost convex portion 11d of the bellows main body 11a so as to face the neck ring 15 and the blade 12 moves relative to the bellows main body 11a by bending the flexible tube device 10. The amount of movement of the blade 12 is regulated by hitting the neck ring 15 at the time.

  The stopper member 21 does not necessarily have a ring shape, and may be configured with one or a plurality of tongue pieces as long as the necessary strength when hitting the neck ring 15 can be obtained. Further, since the stopper member 21 regulates the movement amount of the blade 12 by abutting against the neck ring 15, the stopper member 21 may be fixed to at least the blade 12 by welding, an adhesive, or the like.

  As described above, the other end of the blade 12 is not fixed to the bellows main body 11a but is a free end, and the blade 12 is movable with respect to the bellows main body 11a. The stopper member 21 attached to the end portion of the blade 12 and the neck ring 15 abutted against the outermost convex portion 11d of the bellows main body 11a are spaced apart and face each other with a predetermined interval 22 therebetween. The stopper member 21 regulates the amount of movement of the blade 12 relative to the bellows body 11a by abutting against the opposing neck ring 15 when the flexible tube device 10 is bent. When the flexible tube device 10 is bent, the blade 12 can move with respect to the bellows main body 11a within the predetermined interval 22.

The connection of the bellows tube 11, the blade 12 and the connecting tube 13 at the other end of the bellows tube 11 may be as shown in FIG. 6 instead of the configuration shown in FIG. That is, the configuration shown in FIG. 6 is characterized in that the end of the blade 12 is folded back by the blade ring 23 and pressed against the outer peripheral surface of the stopper member 21 by the blade pressing member 16. The blade ring 23 is formed of a metal wire material such as stainless steel, steel, an aluminum alloy, or copper, or a synthetic resin wire material such as vinyl chloride resin or polyethylene resin. A concave portion 21 a is formed on the outer peripheral surface of the stopper member 21, and a concave portion 16 a is also provided on the inner peripheral surface of the blade pressing member 16. End of the blade 12, in the portion protruding from the bellows body 11a, is folded by the blade ring 23, the folded portion is folded back by the blade ring 23 is sandwiched between the blade presser member 16 and the stopper member 21. The folded-back portion that is folded back and expanded by the blade ring 23 engages with the recess 16a of the blade pressing member 16 and the recess 21a of the stopper member 21, so that even if a force in the disconnecting direction is applied to the blade 12, the disconnection is reliably prevented. . The blade pressing member 16 shown in FIG. 6 is composed of, for example, a pair of ring halves, and the ends folded by the blade ring 23 are pressed against the stopper member 21 by tightening the ends of the ring halves with screws or the like. It has come to be attached. Further, the blade 12 is fixed to the stopper member 21 by welding or the like before and after the stopper member 21 (welded portions are indicated by 20e and 20f in FIG. 6). Of course, the welding location may be either 20d or 20e as long as the required strength is obtained.

  Further, by providing a concave portion on the outer peripheral surface of the neck ring 15 instead of the stopper member 21, the portion folded back by the blade ring 23 is sandwiched between the concave portion 16a of the blade pressing member 16, so that FIG. It can also be employed on the fixed end side shown.

  Further, a rust preventive tape 17 is further wound around the outer peripheral portion of the blade 12 wound around the bellows tube 11, and a protective tape 18 is further wound. The rust preventive tape 17 and the protective tape 18 are fixed by a retaining ring 19 at one end of the bellows main body 11a. The rust preventive tape 17 prevents the bellows pipe 11 from reaching the bellows pipe 11 even when water penetrates from the protective tape 18 whose adhesive strength is reduced by burying the flexible pipe device 10 in the ground for a long period of time. Prevent corrosion. Note that the blade 12, the antirust tape 17 and the protective tape 18 wound around the bellows body 11a do not impair the properties of the bellows tube 11 such as flexibility and stretchability. Further, the rust preventive tape 17, the protective tape 18, and the retaining ring 19 are not particularly required depending on use conditions.

As shown in FIGS. 1 and 2, the flexible tube device 10 configured as described above has an outer peripheral portion of an obstacle when detouring an obstacle such as a sewage manhole 5, a gas pipe 2, and a communication cable 3. The loose flange mechanism 14 at both ends is connected to the loose flange mechanism 14 of the water pipe 1. The flexible tube device 10 is bent by a worker's hand in a narrow laying groove 6 formed around an obstacle. In addition, when it is necessary to ensure rust prevention and mechanical protection especially for the water pipe 1 and the flexible pipe device 10 depending on the installation conditions, a rust prevention tape or a protection tape is provided on the outer peripheral portion of the connection portion described above. You may make it wind. In the piping system of the water pipe 1 using the flexible pipe device 10, even when there is an obstacle in the laying path during the piping work of the water pipe 1, the conventional flexible pipe device 10 is used. It is no longer necessary to use a plurality of regular curved pipes or the like as in the case of piping work. Further, the flexible tube device 10 can be easily bent into a predetermined shape by an operator's hand without using a tool. Therefore, in this piping system, piping work can be performed easily and quickly.

  In addition, the pipe construction of the water pipe 1 is performed by detouring the sewage manhole 5 and then filling the excavated laying groove 6 with backfilling and then filling the ground with a roller or the like. The paving work is performed and completed as necessary.

  As shown in FIG. 4, the flexible tube device 10 used in the piping work as described above has a blade 12 fixed to the bellows main body 11a at one end of the bellows main body 11a and a blade 12 at the other end. It is comprised so that it may protrude to the fitting end part 11b side of the main body 11a, and becomes a free end. Further, the blade 12 is movable with respect to the bellows body 11a. Therefore, the flexible tube device 10 can be bent according to the bending characteristics of the bellows body 11a, rather than depending on the bending characteristics of the blade 12, when performing bending work in the plumbing work of the water pipe 1. The flexible tube device 100 can be bent with a smaller force than when it is bent by hand. When the flexible tube device 10 is bent, as shown in FIG. 5, the blade 12 moves relative to the bellows main body 11 a by the extension on the outer peripheral side of the bellows main body 11 a, so that the stopper member 21 becomes the neck ring 15. Proximity to.

As shown in Equation 1 above, when the flexible tube device 10 is bent so that the bending angle becomes θ, the outer peripheral length LB _OUT is compared with the length LB _TA of the tube axis TA of the bellows body 11a. Thus, it becomes longer by (D / 2) πθ / 180. This (D / 2) πθ / 180 is absorbed by a predetermined distance 22 between the stopper member 21 attached to the end of the blade 12 and the neck ring 15 abutted against the outermost convex portion 11d of the bellows body 11a. Is done. Therefore, the flexible tube device 10 can bend the bellows main body 11a without depending on the bending characteristics of the blade 12, and the conventional flexible tube device 100 in which the blade 12 is fixed to both ends of the bellows main body 11a. the bending properties of the blade 12 length LB _TA of the tube axis TA of the bellows main body 11a is eliminated to be compressed as the bending operator can easily perform the bending operations when working.

  Accordingly, the size of the predetermined interval 22 provided between the neck ring 15 and the stopper member 21 is not particularly limited. For example, the bellows tube 11 alone at the time of the assumed maximum bending of the flexible tube device 10 is used. If the length of the neutral axis of the bellows body 11a is subtracted from the length of the outer periphery of the bellows body 11a, the bending work is always performed with the original characteristics of the bellows tube 11 without being affected by the bending characteristics of the blade 12. It can be carried out. Here, the assumed maximum bending amount is the maximum bending amount assumed by the manufacturer at the time of design or the like.

Moreover, when ground subsidence etc. generate | occur | produce, the bellows main body 11a will extend | expand the flexible tube apparatus 10 with which both ends are fixed to the water pipe 1 within the range of the predetermined space | interval 22. When an even greater force is applied, the stopper member 21 is deformed or broken, or the blade 12 is broken, and the bellows tube 11 is further reduced by the length LB _TA of the length LB _TA of the axis TA from the manufacturing characteristics of the bellows tube 11. Can stretch more than twice. Therefore, even when a large force is applied due to ground subsidence or further earthquake, the generated displacement can be absorbed by the extension of the bellows pipe 11 and the water pipe 1 is connected. It can prevent that excessive force is added to a part etc. and the connection part of the water pipe 1 is damaged .

  Next, another example of the flexible tube device to which the present invention is applied will be described with reference to FIG. In the flexible tube device 10 described above, the blade can be moved with respect to the bellows body 11a with one end of the blade 12 as a fixed end and the other end as a free end. Both ends of the blade 12 are free ends. That is, as shown in FIG. 5 and FIG. 7, the connection pipe 13 is fitted to each of the fitting end portions 11 b provided at both ends of the bellows pipe 11, and the neck is welded to the connection pipe 13 at the welding location 20 b. The ring 15 is abutted against the outermost convex portion 11d of the bellows body 11a from the outside. A blade pressing member 16 that protects the end of the blade 12 is attached to both ends of the blade 12, and a ring-shaped stopper member 21 is attached to the end of the blade 12 and the blade pressing member 16 by welding. (The weld location is indicated by 20d in FIGS. 5 and 7). Thereby, the stopper member 21 attached to the end portion of the blade 12 and the neck ring 15 abutted against the outermost convex portion 11d of the bellows main body 11a are opposed to each other through the predetermined intervals 31 and 32.

  In addition, you may make it the connection of the bellows pipe | tube 11, the braid | blade 12, and the connection pipe 13 in the both ends of the bellows pipe | tube 11 as shown in the said FIG.

  As shown in FIG. 7, in the flexible tube device 30 configured as described above, the blades 12 are free ends at both ends of the bellows main body 11a, and protrude from the fitting end 11b side of the bellows main body 11a. It is configured. Further, the blade 12 is movable with respect to the bellows body 11a. Therefore, the flexible tube device 30 can be bent according to the bending characteristics of the bellows body 11a, not depending on the bending characteristics of the blade 12, when performing the bending operation. When the flexible tube device 30 is bent, the stopper member 21 comes close to the neck ring 15 as the blade 12 moves with respect to the bellows body 11a as shown in FIG.

As shown in the above equation 1, when the flexible tube device 30 is bent so that the bending angle becomes θ, the outer peripheral length LB _OUT is compared with the length LB _TA of the tube axis TA of the bellows body 11a. Thus, it becomes longer by (D / 2) πθ / 180. This (D / 2) πθ / 180 is absorbed by the predetermined distances 31, 32 between the stopper member 21 and the neck ring 15 provided at both ends of the bellows body 11a. Therefore, the flexible tube device 30 can bend the bellows main body 11a without depending on the bending characteristics of the blade 12, and the conventional flexible tube device 100 in which the blade 12 is fixed to both ends of the bellows main body 11a. the bending properties of the blade 12 length LB _TA of the tube axis TA of the bellows main body 11a is eliminated to be compressed as the bending operator can easily perform the bending operations when working.

  Therefore, the dimensions of the predetermined intervals 31 and 32 provided between the neck ring 15 and the stopper member 21 are not particularly limited. For example, the bellows tube 11 at the time of the assumed maximum bending of the flexible tube device 10 is used. If the value obtained by subtracting the length of the neutral axis of the bellows main body 11a from the length of the outer periphery of the single bellows main body 11a can be absorbed by both of the predetermined intervals 31 and 32 provided at both ends of the bellows main body 11a. The bending work can always be performed with the original characteristics of the bellows tube 11 without being affected by the bending characteristics of the blade 12. Compared with the predetermined interval 22 of the flexible tube device 10 described above for each of the predetermined intervals 31 and 32, the flexible tube device 30 has two predetermined intervals 31 and 32 at the time of assumed maximum bending of the flexible tube device 10. It is only necessary to absorb a value obtained by subtracting the length of the neutral axis of the bellows main body 11a from the length of the outer periphery of the bellows main body 11a of the bellows pipe 11 alone. Become.

  In the flexible tube device 30 described above, both end portions of the blade 12 are free ends. However, the blade 12 may be fixed to the bellows main body 11a with an adhesive or the like in the middle of the bellows main body 11a, for example, in the center. good. In this case, in the blade 12, the relationship between the fixed portion and the free ends at both ends is the same as that of the flexible tube device 10 shown in FIG. 3 in which one end of the blade 12 is fixed and the other end is free. The same effects as those of the flexible tube devices 10 and 30 can be obtained.

Furthermore, another example of the flexible tube device to which the present invention is applied will be described with reference to FIG. The flexible tube device 40 shown in FIG. 8 is characterized in that the connection tube 13 is directly welded to the bellows body 11a of the bellows tube 11. That is, the bellows tube 41 used for the flexible tube device 40 has only the bellows main body 41a, and is provided with a fitting end portion 11b fitted to the connecting tube 13 like the bellows tube 11 described above. Absent. The connecting pipes 13 connected to both ends of the bellows pipe 41 are attached so as to coincide with the openings 41d at both ends of the bellows main body 41a. As described above, the connecting pipe 13 is fitted with the neck ring 15 on the outer peripheral portion of the one end portion 13a, and is integrated with the inner peripheral portion of the neck ring 15 by welding (the welding location is shown in FIG. 8). 20b). The neck ring 15 is a neck member that protects the end portion of the bellows main body 41a by being abutted against the outermost convex portion 41b of the bellows main body 41a, and is formed to have substantially the same height as each convex portion 41c. Yes.

  In this example as well, the neck member may be configured such that one or a plurality of tongue pieces provided at the one end portion 13 a of the connection pipe 13 are provided in the circumferential direction of the connection pipe 13 in addition to the neck ring 15. good. Further, as the neck member, when each convex portion 41c constituting the bellows is low, a metal tape such as a stainless steel ribbon is wound around the connecting tube 13 one or more times depending on the thickness of the tape, You may comprise so that it may become substantially the same height.

  Unlike the case of the flexible tube devices 10 and 30, the outer peripheral portion of the neck ring 15 is welded to the outermost convex portion 41b of the bellows main body 41a (the welding location is indicated by 20g in FIG. 8). The connecting pipe 13 is integrally attached to both end portions of the bellows pipe 41 where the fitting end portion is not provided by the welded portion 20g.

  As described above, the blade 12 is formed longer than the bellows body 41a, and thus protrudes from the bellows body 41a. A blade pressing member 16 that protects the end portion of the blade 12 is attached to the end portion of the blade 12 on the outer peripheral portion. Then, a ring-shaped stopper member 21 made of a metal material such as stainless steel is attached to the other end portion of the blade 12 and the blade pressing member 16 by welding (a welding location is indicated by 20d in FIG. 8). . The stopper member 21 faces the neck ring 15 abutted against the outermost convex portion 41b of the bellows main body 41a with a predetermined interval 42 therebetween, and bends the flexible tube device 40 to bend the bellows main body 41a. On the other hand, the amount of movement of the blade 12 is regulated by abutting against the neck ring 15 when the blade 12 moves.

  In the flexible tube device 40 shown in FIG. 8, the connecting tube 13 is directly connected to the bellows body 41a. Here, the bottom portion of the concave groove formed by each convex portion 41 c constituting the bellows of the bellows main body 41 a is formed so as not to be located inside the extension line L <b> 2 of the inner peripheral surface of the connection pipe 13. Here, the inner diameter of the connecting tube 13 and the inner diameter of the bottom portion of the bellows are matched, and the bottom portion of the bellows is formed on the extension line L2 of the inner peripheral surface of the connecting tube 13. Thereby, the connection pipe 13 and the bellows main body 41a do not make the flow path narrower, the hindrance to the flow of tap water can be minimized, and the pressure loss can be minimized. That is, in the flexible tube devices 10 and 30 described above, the fitting end portions 11 b provided at both ends of the bellows tube 11 are inserted into the connection tube 13. Therefore, the bellows tube 11 has an inner diameter smaller than that of the other portion by the thickness of the fitting end portion 11b. On the other hand, in this flexible tube device 40, the inner diameters of the connecting tube 13 and the bellows tube 11 can be made to coincide with each other, and the hindrance to the flow of tap water is further minimized as compared with the flexible tube devices 10 and 30. Pressure loss can be kept to a minimum.

  In addition, the bellows pipe 41 is not provided with a straight pipe portion such as a fitting end portion, and is provided with a bellows over the entire length thereof. Therefore, it is necessary to manufacture a cylindrical body provided with the bellows by the manufacturing method described above. It can be manufactured simply by cutting with a long length, can be produced efficiently, and the manufacturing cost can be reduced.

  As described above, the end portion of the blade 12 is not fixed to the bellows main body 41a but is a free end, and the blade 12 is movable with respect to the bellows main body 41a. The stopper member 21 attached to the end of the blade 12 and the neck ring 15 abutted against the outermost convex portion 41b of the bellows main body 41a are spaced apart and face each other with a predetermined interval 42 therebetween. The stopper member 21 regulates the amount of movement of the blade 12 relative to the bellows body 41a by abutting against the opposing neck ring 15 when the flexible tube device 40 is bent. When the flexible tube device 40 is bent, the blade 12 can move with respect to the bellows body 11a within the predetermined interval 42.

  The structure shown in FIG. 8 as described above is applied to a flexible tube device having both ends of the blade 12 as free ends and a flexible tube device having one end as a fixed end and the other end as a free end. be able to. Even with such a configuration, the same effects as those of the flexible tube devices 10 and 30 described above can be obtained.

  Moreover, as a structure which welds the connection pipe 13 directly to the bellows main body 41a, you may make it show in FIG. In the example of FIG. 8, the outer peripheral portion of the neck ring 15 is welded to the outermost convex portion 41 b of the bellows body 41 a of the bellows tube 41, but in the example of FIG. 9, one end portion 13 a of the connection tube 13 is opened to the bellows tube 41 a. It abuts on the portion 41d and is welded to the opening end of the opening 41d (the welding location is indicated by 20h in FIG. 9). Further, the neck ring 15 is welded slightly inward from the one end portion 13a of the connecting pipe 13 (the welding location is indicated by 20i in FIG. 9), and between the neck ring 15 and the outermost convex portion 41b of the bellows body 41a. In addition, a gap 43 is provided. The gap 43 prevents the impact when the flexible tube device 40 is bent and the stopper member 21 hits the neck ring 15 from being transmitted to the welded portion 20h of the connecting tube 13 and the bellows tube 41, and protects the welded portion 20h. ing. The gap 43 needs to be set such that the foreign matter does not hit the outermost convex portion 41b of the bellows main body 41a.

  In the example of FIG. 9, first, the one end 13a of the connecting pipe 13 is abutted against the opening 41d of the bellows pipe 41 and welded (welded spot 20h). Next, the neck ring 15 is fitted and welded to the connecting pipe 13 so as to form a gap 43 (welded spot 20i).

  The gap 43 provided between the neck ring 15 and the outermost convex portion 41b of the bellows main body 41a may be provided also in the flexible tube devices 10 and 30 described above. That is, when the connecting tube 13 having the neck ring 15 attached to the fitting end portion 11a of the bellows tube 11 is inserted, the tip end portion of the fitting end portion 11b at a position before the neck ring 15 abuts against the outermost convex portion 11d. And the inner peripheral surface of the connecting pipe 13 may be welded.

  According to the flexible tube apparatuses 10, 30, and 40 described above, the blade 12 can be moved with respect to the bellows main bodies 11a and 41a, and the resistance to the worker during bending is lowered and bending is facilitated. Thus, a flexible tube device having such flexibility that the operator can be bent by hand can be realized even if the diameter is about 50 mm to about 300 mm, and further about 500 mm.

  Further, the neck members such as the connection pipe 13 and the neck ring 15 may be integrally formed of a cast product or a resin molded product in order to reduce the number of connection points.

  Furthermore, although the case where the flexible tube apparatus 10 which applied this invention to the piping system of the water pipe 1 was used was demonstrated above, this invention is applicable also to the piping construction of a middle water conduit or a sewer pipe, Furthermore, the present invention can be applied to detour piping work of a conduit through which a fluid made of a gas such as city gas or cooling gas or a solid such as a powder, granule, or gel. Furthermore, the flexible tube device according to the present invention can be applied to an exposed tube in addition to a buried tube.

It is a perspective view which shows the use condition of the flexible tube apparatus to which this invention is applied. It is a perspective view which shows the state by which the said flexible tube apparatus was laid in the laying groove | channel. It is a partially cutaway side view of the said flexible tube apparatus. It is sectional drawing which shows the attachment state of the bellows pipe, a braid | blade, and a connection pipe in one edge part of a bellows pipe. It is sectional drawing which shows the attachment state of the bellows pipe in the other edge part of a bellows pipe, a braid | blade, and a connection pipe. It is sectional drawing which shows the other example of the attachment state of a bellows pipe | tube, a braid | blade, and a connection pipe. It is a partially notched side view which shows the other example of the flexible tube apparatus to which this invention is applied. It is sectional drawing which shows the further another example of the flexible tube apparatus to which this invention is applied. It is sectional drawing which shows the further another example of the flexible tube apparatus to which this invention is applied. It is sectional drawing which shows the attachment state of the bellows pipe | tube of the conventional flexible tube apparatus, a braid | blade, and a connection pipe. It is a side view of a bellows pipe, (A) shows a straight state, and (B) shows a bent state. It is a side view of a blade, (A) shows a straight state, (B) shows a bent state. It is a side view which shows the state by which the braid | blade was wound by the bellows pipe | tube, (A) shows a straight state, (B) shows the bent state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water pipe, 5 Sewage manhole, 10, 30, 40 Flexible pipe apparatus, 11, 41 Bellows pipe, 11a, 41a Bellows main body, 11b Fitting end part, 11c Convex part, 11d Outermost convex part, 12 Blade, 13 Connection pipe, 14 Loose flange mechanism, 15 Neck ring, 16 Blade pressing member, 17 Rust prevention tape, 18 Protection tape, 19 Stop ring, 20a-20d Welding location, 21 Stopper member, 22, 31, 32, 42 Predetermined spacing

Claims (5)

A bellows tube having a bellows body provided with a bellows, a blade wound around the outer periphery of the bellows body so as to be movable in the tube axis direction of the bellows tube, and one end portion integrated with both end portions of the bellows tube And a connecting pipe connected to the conduit at the other end,
Neck members that are integrally attached to the outer periphery of the connection pipe are disposed at both ends of the bellows body,
The blade is longer than the bellows body, the portion protruding from the outermost convex portion of the bellows body, the stopper member so as to face through the neck member by a predetermined distance are integrally attached, the bellows A flexible tube device that moves in a tube axis direction with respect to the bellows tube within a predetermined interval until the stopper member hits the neck member when the tube is bent . At both ends of the bellows body, a fitting end connected to the connecting pipe is provided,
The mating end is inserted into the connection tube, the claims together with the inner peripheral surface of the mating end and the connection tube and is welded, the connection tube and the said neck member Ru is integrated by welding The flexible tube device according to 1. One end of the connecting tube is a flexible tube according to claim 1, wherein that will be welded to an opening formed at both ends of the bellows body. At one end of the bellows tube, the blade is fixed to the bellows tube,
At the other end of the bellows tube, the neck member and the stopper member are opposed to each other with the predetermined distance between them.
At least the predetermined interval provided at the other end of the bellows pipe has a value obtained by subtracting the length of the neutral axis of the bellows body from the length of the outer periphery of the bellows body at the assumed maximum bending. Tei Ru claim 1 to of claim 3, the flexible tube device according to any one. At both ends of the bellows pipe, the neck member and the stopper member are opposed to each other with the predetermined distance between them.
At least, claim a sum of a predetermined interval of both ends of the bellows tube, that has a value obtained by subtracting the length of the neutral axis of the bellows body from the length of the outer periphery during bending highest expected use of the bellows body The flexible tube device according to any one of claims 1 to 3.

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