Retention structure and retention tool for use with the retention structure

Abstract

To properly maintain a connection state of an inside cover and an outside cover by not only preventing a relative detachment of the inside cover and the outside cover but also maintaining the inside cover in a proper state.SOLUTION: A retention structure is for preventing a relative detachment of an inside cover 2 for piping and an outside cover 3 for piping externally fitted and connected to an end part of the inside cover 2. The retention structure comprises a retention tool 5 that is attachable to the end part of the inside cover 2, is locked to an inner surface part of the outside cover 3 with the retention tool attached to the inside cover 2, and exerts a retention action of preventing a relative detachment of the inside cover 2 and the outside cover 3. The inside cover 2 is formed by combination of a plurality of split bodies. The retention tool 5 comprises an assembling state maintenance action part, which exerts an assembling state maintenance action of maintaining the plurality of split bodies in an assembled state with respect to the inside cover 2 with the assembling state maintenance action part assembled to the inside cover 2.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a retaining structure for preventing relative detachment between an inner cover for a pipe and an outer cover for a pipe, and a retaining tool used for the retaining structure.

Background Art

[0002] When installing a cover for a pipe along a pipe path, for example, at a bent path portion where the pipe path is bent, a branch point, a confluence point, etc., an inner cover and an outer cover having a larger diameter than the inner cover are provided, and the inner cover and the outer cover are continuously arranged along the pipe path (see, for example, Patent Document 1). At the connection portion between the inner cover and the outer cover, by externally fitting and connecting the outer cover to the end of the inner cover, a certain amount of insertion allowance for inserting the inner cover into the outer cover is ensured, and the inner cover and the outer cover are arranged in a double layer.

[0003] At the connection portion between the inner cover and the outer cover where the inner cover and the outer cover are arranged in a double layer, if the inner cover or the outer cover moves in its longitudinal direction, the insertion allowance will disappear, and the inner cover and the outer cover may relatively come off. Therefore, in Patent Document 1, a retaining structure for preventing relative detachment between the inner cover for a pipe and the outer cover for a pipe is adopted.

[0004] In the retaining structure described in this Patent Document 1, a retaining tool that can be attached to the end of the inner cover and has a locking action on the inner surface of the outer cover when attached to the inner cover is used.

[0005] The inner surface of the outer cover is provided with a stopper portion protruding inward, and the retaining tool is provided with a contact portion that can contact the stopper portion. In a state where the retaining tool is attached to the inner cover, even if the inner cover or the outer cover moves in its longitudinal direction, the contact portion of the retaining tool contacts the stopper portion, thereby exerting a locking action on the inner surface of the outer cover and preventing relative detachment between the inner cover and the outer cover.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] In the anti-disengagement structure described in Patent Document 1, an anti-disengagement tool is used, but this anti-disengagement tool only has an anti-disengagement function for preventing relative disengagement between the inner cover and the outer cover.

[0008] However, in order to appropriately maintain the connection state between the inner cover and the outer cover, it is required not only to prevent relative disengagement between the inner cover and the outer cover, but also to maintain the inner cover and the outer cover in an appropriate state. For example, since the inner cover has a split structure in which a plurality of split bodies are combined and connected, if a deviation occurs between the split bodies or the connection between the split bodies comes off, the state in which the inner cover is externally fitted and connected by the outer cover will collapse, and there is a possibility that the connection state between the inner cover and the outer cover cannot be appropriately maintained.

[0009] In view of this actual situation, the main problem of the present invention is to provide an anti-disengagement structure that can not only prevent relative disengagement between the inner cover and the outer cover, but also maintain the inner cover in an appropriate state and appropriately maintain the connection state between the inner cover and the outer cover, and an anti-disengagement tool used for the anti-disengagement structure.

Means for Solving the Problems

[0010] The first characteristic configuration of the present invention is in an anti-disengagement structure for preventing relative disengagement between an inner cover for a pipe and an outer cover for a pipe that is externally fitted and connected to an end portion of the inner cover. It is possible to attach it to the end of the inner cover, and in a state where it is attached to the inner cover, it locks to the inner surface of the outer cover and has a retaining function that prevents relative detachment between the inner cover and the outer cover, and a retaining device that exerts the retaining function is provided. The inner cover is formed by combining a plurality of divided bodies. The retaining device is provided with an assembly state maintaining action part that, in a state where it is attached to the inner cover, exerts an assembly state maintaining action of maintaining the assembled state in which a plurality of divided bodies are combined with respect to the inner cover.

[0011] According to this configuration, in a state where the retaining device is attached to the inner cover, the retaining device locks to the inner surface of the outer cover and exerts a retaining action, so relative detachment between the inner cover and the outer cover can be prevented. Moreover, since the retaining device is provided with an assembly state maintaining action part, the assembly state maintaining action part exerts an assembly state maintaining action and can maintain the assembled state in which a plurality of divided bodies are combined in the inner cover, and the inner cover can be maintained in an appropriate state. Therefore, by simply attaching the retaining device to the inner cover, while simplifying the configuration, not only can relative detachment between the inner cover and the outer cover be prevented, but the inner cover can be maintained in an appropriate state and the connection state between the inner cover and the outer cover can be appropriately maintained.

[0012] A second characteristic configuration of the present invention is that the assembly state maintaining action part has a plurality of claw parts that can be engaged with a plurality of divided bodies, and is provided as a misalignment preventing action part that exerts a misalignment preventing action of preventing misalignment of the divided bodies by engaging the plurality of claw parts with the plurality of divided bodies.

[0013] According to this configuration, the misalignment preventing action part exerts a misalignment preventing action of preventing misalignment of the divided bodies by engaging the plurality of claw parts with the plurality of divided bodies, so misalignment of the divided bodies between the plurality of divided bodies can be prevented, and the inner cover can be maintained in an appropriate state.

[0014] The third characteristic configuration of the present invention is that the misalignment prevention action part is provided with a clamping body that sandwiches the inner surface side and the outer surface side of the divided body, and the claw part is disposed on the clamping body.

[0015] According to this configuration, since the misalignment prevention action part can bite the claw part into the divided body in a state where the inner surface side and the outer surface side of the divided body are sandwiched by the clamping body, the movement of the divided body can be appropriately prevented, and the misalignment prevention action can be appropriately exerted.

[0016] The fourth characteristic configuration of the present invention is that each of the plurality of divided bodies is provided with a fitting part that can be freely fitted with the fitting part of another divided body. The inner cover has the fitting parts in the plurality of divided bodies fitted together to form an assembled state. The assembled state maintaining action part is provided as a fitting disengagement prevention action part that has an enclosing part that surrounds the periphery of the fitted fitting parts and exerts a fitting disengagement prevention action of preventing the fitted fitting parts from being disengaged.

[0017] According to this configuration, the fitting disengagement prevention action part exerts a fitting disengagement prevention action of preventing the fitted fitting parts from being disengaged by surrounding the periphery of the fitted fitting parts with the enclosing part, so that it is possible to prevent the fitted fitting parts from being disengaged and the divided bodies from being in a divided state, and the inner cover can be maintained in an appropriate state.

[0018] The fifth characteristic configuration of the present invention is that the fitting disengagement prevention action part is provided with a regulating wall part that regulates the movement of the fitted fitting parts in the fitting disengagement direction.

[0019] If some external force or the like acts on the fitted fitting parts and the fitting parts move in the fitting disengagement direction, the fitting of the fitting parts will be disengaged. Therefore, according to this configuration, the fitting disengagement prevention action part only has a simple regulating wall part, and even if some external force or the like acts, the regulating wall part can regulate the movement of the fitting parts in the fitting disengagement direction, thereby simplifying the configuration while appropriately preventing the fitting parts from being disengaged.

[0020] The sixth characteristic configuration of the present invention is a retaining tool used in a retaining structure for preventing relative detachment between an inner cover for a pipe and an outer cover for a pipe externally fitted and connected to an end of the inner cover, wherein a mounting portion that can be mounted on an end of the inner cover, and a retaining action portion that, when mounted on the inner cover, engages with the inner surface portion of the outer cover to prevent relative detachment between the inner cover and the outer cover and exhibits a retaining action; and a mounting state maintaining action portion that, when mounted on the inner cover, exhibits a mounting state maintaining action for maintaining a plurality of divided bodies in an assembled state with respect to the inner cover.

[0021] According to this configuration, the retaining tool can be attached to the end of the inner cover at the attachment portion, and when attached to the inner cover, not only does the retaining action portion exhibit a retaining action for preventing relative detachment between the inner cover and the outer cover, but the mounting state maintaining action portion can also exhibit a mounting state maintaining action for maintaining a plurality of divided bodies in an assembled state. Therefore, by simply attaching the retaining tool to the inner cover, while simplifying the configuration, not only can relative detachment between the inner cover and the outer cover be prevented, but the inner cover can also be maintained in an appropriate state.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiment for Carrying out the Invention

[0023] Embodiments of the retaining structure according to the present invention and the retaining device used in the retaining structure will be described with reference to the drawings. In FIGS. 1 and 2, a branch or confluence point of the pipe 1 (shown by a dashed line in FIG. 2) is shown. In FIG. 1, an external view with pipe covers 2 and 3 covering the pipe 1 attached is shown, and in FIG. 2, a cross-sectional view in FIG. 1 is shown.

[0024] As shown in FIGS. 1 and 2, as a pipe cover covering the periphery of the pipe 1, an inner cover 2 and an outer cover 3 having a larger diameter than the inner cover 2 are provided, and the inner cover 2 and the outer cover 3 are continuously arranged along the pipe path. At the connection portion between the inner cover 2 and the outer cover 3, the end portion of the outer cover 3 is externally fitted and connected to the end portion of the inner cover 2, and the retaining structure according to the present invention is applied at the connection portion between the inner cover 2 and the outer cover 3.

[0025] As the pipe 1, a first pipe 11 and a second pipe 12 extending in the left - right direction in FIG. 2 are arranged in a parallel state with a space therebetween in the up - down direction in FIG. 2, and the second pipe 12 is in contact with the central part of the first pipe 11. The space between the first pipe 11 and the second pipe 12 in the up - down direction in FIG. 2 is a narrow space, and the first pipe 11 and the second pipe 12 are arranged in a state where they are as close as possible. The end part of the second pipe 12 is connected to the central part of the first pipe 11 in a bent state. Incidentally, although not shown in the figure, as shown in FIG. 2, when arranging the first pipe 11 and the second pipe 12, for example, instead of directly connecting the first pipe 11 and the second pipe 12, a connecting pipe or the like having a right - angled shape is connected between the first pipe 11 and the second pipe 12, and they can be connected in a state where a connecting pipe or the like is interposed between the first pipe 11 and the second pipe 12.

[0026] As shown in FIGS. 1, 2, and 4, the inner cover 2 is constituted by, for example, a linear cylindrical cover. In this embodiment, as the inner cover 2, four inner covers 2, namely, first to fourth inner covers 21 to 24 are provided. Incidentally, in FIG. 4, the fourth inner cover 24 as the inner cover 2 is shown.

[0027] As shown in FIGS. 1 and 2, the first inner cover 21 and the second inner cover 22 cover the periphery of the first pipe 11, and the third inner cover 23 and the fourth inner cover 24 cover the periphery of the second pipe 12. In FIG. 2, the first inner cover 21 is disposed on the upper - right side in a posture extending in the left - right direction so as to cover the right - hand side part of the first pipe 11, and the second inner cover 22 is disposed on the upper - left side in a posture extending in the left - right direction so as to cover the left - hand side part of the first pipe 11. The third inner cover 23 is disposed on the lower - right side in a posture extending in the left - right direction so as to cover the straight - line part of the second pipe 12, and the fourth inner cover 24 is disposed in a posture extending in the up - down direction so as to cover the bent part of the second pipe 12.

[0028] As shown in FIGS. 1 and 2, the outer cover 3 is used to connect the inner covers 2 to each other and is configured as a cylindrical cover capable of connecting the inner covers 2 in a plurality of directions. In this embodiment, as the outer cover 3, there are provided a first outer cover 31 that connects between the first inner cover 21, the second inner cover 22, and the fourth inner cover 24, and a second outer cover 32 that connects between the third inner cover 23 and the fourth inner cover 24.

[0029] The first outer cover 31 is formed in a shape (for example, a T shape) capable of connecting the inner covers 2 in three directions, i.e., both sides and the lower side in the left-right direction in FIGS. 1 and 2, in order to connect between the first inner cover 21, the second inner cover 22, and the fourth inner cover 24. The second outer cover 32 is formed in a shape (for example, an L shape) capable of connecting the inner covers 2 in two directions, i.e., the upper side and the right side in FIGS. 1 and 2, in order to connect the third inner cover 23 and the fourth inner cover 24 that are orthogonal to each other.

[0030] As shown in FIGS. 1 and 2, the first pipe 11 is continuously surrounded by the first inner cover 21, the first outer cover 31, and the second inner cover 22. At the connection portion between the first inner cover 21 and the first outer cover 31, as shown in FIG. 2, one end side of the first outer cover 31 is externally fitted and connected to the connection-side end portion of the first inner cover 21, and a certain amount of insertion allowance for inserting the first inner cover 21 into the first outer cover 31 is ensured, and the first inner cover 21 and the first outer cover 31 are arranged in a double layer, inside and outside. Similarly, at the connection portion between the second inner cover 22 and the first outer cover 31, the other end side of the second outer cover 32 is externally fitted and connected to the connection-side end portion of the second inner cover 22.

[0031] As shown in FIGS. 1 and 2, the second pipe 12 is continuously surrounded by the third inner cover 23, the second outer cover 32, the fourth inner cover 24, and the first outer cover 31. At the connection portion between the third inner cover 23 and the second outer cover 32, as shown in FIG. 2, one end side of the second outer cover 32 is externally fitted and connected to the connection-side end portion of the third inner cover 23.

[0032] The first outer cover 31 and the second outer cover 32 are connected in a state of butting against each other in the vertical direction in FIGS. 1 and 2. As shown in FIG. 2, a fourth inner cover 24 is disposed inside the butting connection portion. Thereby, even if a slight gap is generated between the first outer cover 31 and the second outer cover 32 at the butting connection portion between the first outer cover 31 and the second outer cover 32, it is possible to prevent the pipe 1 from being exposed by the fourth inner cover 24. Since the fourth inner cover 24 is disposed at the butting connection portion between the outer covers 3, its length is limited to a length that can be accommodated within the butting connection portion between the outer covers 3, and the length of the fourth inner cover 24 is set shorter than that of the first to third inner covers 21 to 23.

[0033] Regarding the connection portion between the fourth inner cover 24 and the first outer cover 31 and the connection portion between the fourth inner cover 24 and the second outer cover 32, as shown in FIG. 2, similar to the connection portion between the other inner cover 2 and the outer cover 3, the end portion of the outer cover 3 is externally fitted and connected to the end portion of the inner cover 2.

[0034] The retaining structure according to the present invention is a structure for preventing relative detachment between the inner cover 2 and the outer cover 3 at the connection portion between the inner cover 2 and the outer cover 3, as shown in FIGS. 1 and 2. For this purpose, the retaining structure according to the present invention is applied to the connection portion between the inner cover 2 and the outer cover 3. However, in this embodiment, as shown in FIGS. 1 and 2, there are a total of five connection portions between the inner cover 2 and the outer cover 3.

[0035] As shown in FIGS. 1 and 2, the first is the connection location on the upper right side where the first outer cover 31 is externally fitted and connected to the first inner cover 21. The second is the connection location on the upper left side where the first outer cover 31 is externally fitted and connected to the second inner cover 22. The third is the connection location on the lower right side where the second outer cover 32 is externally fitted and connected to the third inner cover 23. The fourth and fifth correspond to the butting connection locations between the first outer cover 31 and the second outer cover 32. As shown in FIG. 2, inside thereof, there are a connection location on the upper central side where the first outer cover 31 is externally fitted and connected to the fourth inner cover 24, and a connection location on the lower central side where the second outer cover 32 is externally fitted and connected to the fourth inner cover 24.

[0036] Hereinafter, the anti-loosening structure according to the present invention will be described. Among the connection locations between the inner cover 2 and the outer cover 3, since the same structure is applied to any connection location, the one applied to the butting connection location between the first outer cover 31 and the second outer cover 32 will be described.

[0037] At the butting connection location between the first outer cover 31 and the second outer cover 32, as shown in FIGS. 1 and 2, the first outer cover 31 and the second outer cover 32 are butted and connected. As shown in FIG. 2, with respect to the fourth inner cover 24 disposed inside thereof, the first outer cover 31 is externally fitted and connected to one end (the upper end in FIG. 2) of the fourth inner cover 24, and the second outer cover 32 is externally fitted and connected to the other end (the lower end in FIG. 2) of the fourth inner cover 24.

[0038] Both the first outer cover 31 and the second outer cover 32 are each composed of a plurality (for example, two) of divided outer covers 31a and 32a combined together to form one outer cover 3, as shown in FIG. 4. In this embodiment, for the first outer cover 31, the semi-divided semi-circular divided first outer covers 31a are fitted and connected to each other, and a fixture such as a screw is attached to and fixed to the fixture attachment portion 34 (see FIGS. 1 and 2), thereby forming the cylindrical first outer cover 31. Similarly, for the second outer cover 32, the semi-divided semi-circular divided second outer covers 32a are fitted and connected to each other, and a fixture such as a screw is attached to and fixed to the fixture attachment portion 34 (see FIGS. 1, 2, and 4), thereby forming the cylindrical second outer cover 32.

[0039] On the inner surfaces of the first outer cover 31 and the second outer cover 32, as shown in FIG. 4, there are provided cover rattling prevention portions 33 that protrude inward. These cover rattling prevention portions 33 abut against the outer surface portion of the inner cover 2 that is fitted inside the first outer cover 31 or the second outer cover 32, suppressing the rattling of the inner cover 2. Also, on the inner side of the first outer cover 31 and the second outer cover 32, as shown in FIGS. 2 and 3, there are provided fixture attachment portions 34 that protrude in a state where fixtures such as screws are attached. By abutting against the end portion of the inner cover 2 into which the fixture attachment portion 34 is fitted, the insertion length of the inner cover 2 can be regulated.

[0040] The fourth inner cover 24 is also composed of a plurality (for example, two) of divided fourth inner covers 24a combined together to form one fourth inner cover 24, as shown in FIG. 4, similar to the first outer cover 31 and the second outer cover 32. In this embodiment, each of the two semi-divided fourth inner covers 24a is formed in the same semi-circular shape. Each of the two divided fourth inner covers 24a is provided with fitting portions 4 at both ends in the circumferential direction. By fitting and connecting the fitting portions 4 to each other, the two divided fourth inner covers 24a are fitted and connected to each other, forming the cylindrical fourth inner cover 24.

[0041] Regarding the fitting part 4, as shown in FIGS. 4 and 5(A), it is arranged in a state spanning the entire length in the longitudinal direction of the fourth inner cover 24. For example, as shown in FIG. 8(A), the fitting part 4 with different shapes is provided by the divided fourth inner cover 24a. Among the two divided fourth inner covers 24a, one divided fourth inner cover 24a (the right divided fourth inner cover 24a in FIG. 8(A)) is provided with a hook-shaped first fitting part 41 whose tip is curved, and the other divided fourth inner cover 24a (the left divided fourth inner cover 24a in FIG. 8(A)) is provided with an L-shaped second fitting part 42 that fits into the first fitting part 41. The shape of the fitting part 4 can be appropriately changed, and various shapes can be applied as long as they can be fitted and connected.

[0042] In this anti-disengagement structure, as shown in FIGS. 2 and 5(B), by attaching the anti-disengagement tool 5 to both end portions of one end and the other end of the fourth inner cover 24, the relative disengagement between the fourth inner cover 24 and the first outer cover 31 is prevented, and the relative disengagement between the fourth inner cover 24 and the second outer cover 32 is also prevented. Here, as shown in FIGS. 1, 2, etc., the longitudinal direction of the fourth inner cover 24 which is the inner cover 2 is described as the "cover longitudinal direction X", and the radial direction of the fourth inner cover 24 which is the inner cover 2 is described as the "cover radial direction Y".

[0043] As shown in FIGS. 2 and 5(B), the anti-disengagement tool 5, in a state of being attached to the end portion of the fourth inner cover 24, includes an outer part 51 located outside the fourth inner cover 24 in the cover radial direction Y, an inner part 52 located inside the fourth inner cover 24 in the cover radial direction Y, and a connecting part 53 connecting the outer part 51 and the inner part 52.

[0044] As shown in Fig. 3(A), the outer part 51 is formed in a plate shape extending from the proximal end side to the distal end side along the cover length direction X, and the distal end side part thereof is an inclined part 54 inclined outward in the cover diameter direction Y. As shown in Fig. 3(B), an opening 55 is provided at the center of the distal end of the outer part 51, and a first claw part 56 extending from the distal end side to the proximal end side of the outer part 51 is provided in the opening 55. As shown in Fig. 3(A), this first claw part 56 is provided in a posture of obliquely extending from the outer side to the inner side in the cover diameter direction Y by using the inclined part 54, and the tip part of the first claw part 56 protrudes inward (lower side in Fig. 3(A)) than the outer part 51 in the cover diameter direction Y.

[0045] As shown in Fig. 3(A), the inner part 52 is provided with a plate-shaped inner central part 57 extending from the proximal end side to the distal end side along the cover length direction X, similar to the outer part 51. At both ends in the left-right direction of the inner central part 57, a pair of left and right inner standing wall parts 58 extending from the inner side to the outer side in the cover diameter direction Y are provided. A second claw part 59 extending from the inner side to the outer side in the cover diameter direction Y is provided on each of the pair of left and right inner standing wall parts 58 on the side away from the connecting part 53. The tip part of this second claw part 59 is a part that protrudes most outward (upper side in Fig. 3(A)) in the cover diameter direction Y in the inner standing wall part 58.

[0046] As shown in Fig. 3(A), the connecting part 53 is formed in a plate shape extending along the cover diameter direction Y. The outer part 51, the connecting part 53, and the inner central part 57 in the inner part 52 are formed in a continuous U-shape in side view. The inner part 52 is formed in a continuous U-shape in front view by the inner central part 57 and the pair of left and right inner standing wall parts 58. The retaining member 5 is formed in a shape combining two U-shapes by sharing the inner central part 57 in the inner part 52.

[0047] As shown in Fig. 3(B), the width H1 of the connecting portion 53 in the left-right direction is the same as the width of the outer portion 51 in the left-right direction. On the other hand, the width H2 of the inner central portion 57 of the inner portion 52 in the left-right direction is wider than the width H1 of the connecting portion 53 by a predetermined amount. Thus, in the left-right direction, the outer portion 51 and the pair of left and right inner standing wall portions 58 are arranged in a state where they are independent of each other with a gap therebetween without overlapping.

[0048] As shown in Fig. 3(A), a gap is formed between the outer portion 51 and the pair of left and right inner standing wall portions 58 in the cover radial direction Y of the retaining member 5. As shown in Fig. 5(A), the fourth inner cover 24 is configured to be attachable to the end of the retaining member 5 by inserting the fourth inner cover 24 into the gap. As shown in Fig. 6(B), in a state where the retaining member 5 is attached to the end of the fourth inner cover 24, the fourth inner cover 24 is sandwiched between the outer portion 51 and the pair of left and right inner standing wall portions 58 of the inner portion 52. Thus, the retaining member 5 is provided with an attachment portion 70 that can be attached to the end of the fourth inner cover 24 in a state of sandwiching the inner surface side and the outer surface side of the split fourth inner cover 24a. As shown in Figs. 2 and 6, this attachment portion 70 is constituted by the outer portion 51, the inner portion 52, and the connecting portion 53.

[0049] As shown in Figs. 3 and 6, a first claw portion 56 is disposed on the outer portion 51, and a second claw portion 59 is disposed on each of the pair of left and right inner standing wall portions 58. Therefore, the attachment portion 70 is provided with the first claw portion 56 and the second claw portion 59 that can bite into the split fourth inner cover 24a. As shown in Fig. 6(A), the first claw portion 56 can bite into the outer surface portion of the split fourth inner cover 24a. As shown in Fig. 6(B), the second claw portion 59 can bite into the inner surface portion of the split fourth inner cover 24a. The split fourth inner cover 24a is bitten in a state of being sandwiched from both the inside and the outside by the first claw portion 56 and the second claw portion 59.

[0050] As shown in Fig. 3, a retaining member 5 has a gap formed between an outer portion 51 and an inner upright wall portion 58. As shown in Fig. 5, by inserting the inner cover 2 into the gap between the outer portion 51 and the inner upright wall portion 58, the retaining member 5 is attached to the end of the inner cover 2. At this time, for example, since the thickness of the inner cover 2 is larger than the gap between the outer portion 51 and the inner upright wall portion 58, while elastically deforming the outer portion 51 and the inner upright wall portion 58 to be separated from each other, the inner cover 2 is inserted into the gap between the outer portion 51 and the inner upright wall portion 58. Therefore, due to the action of the elastic restoring force caused by the elastic deformation, as shown in Fig. 6, the inner cover 2 is sandwiched between the outer portion 51 and the inner upright wall portion 58, and the first claw portion 56 and the second claw portion 59 bite into the inner cover 2, so that the retaining member 5 can be easily and surely attached to the inner cover 2.

[0051] As shown in Figs. 3(A) and 6, both the first claw portion 56 and the second claw portion 59 are formed in an inclined shape such that the gap between the outer portion 51 and the claw portions 56, 59 becomes smaller toward the back side (the left side in Fig. 6) in the insertion direction of the fourth inner cover 24. Therefore, when attaching the retaining member 5 to the fourth inner cover 24, when inserting the fourth inner cover 24 into the gap between the outer portion 51 and the inner upright wall portion 58, the first claw portion 56 and the second claw portion 59 are not caught on the outer surface portion or the inner surface portion of the fourth inner cover 24, and the fourth inner cover 24 can be smoothly inserted, and the attachment work of the retaining member 5 can be easily performed. When the retaining member 5 is attached to the end of the inner cover 2, as shown in Figs. 5(B) and 6, due to the action of the elastic force, the inner cover 2 is sandwiched between the outer portion 51 and the inner upright wall portion 58, so that the inner cover 2 can be bitten in a state of being sandwiched from both the inside and the outside by the first claw portion 56 and the second claw portion 59.

[0052] On each of the pair of left and right inner standing wall portions 58, as shown in FIGS. 3 and 6(B), in addition to the second claw portion 59, a retaining tool rattling prevention portion 60 is provided. The retaining tool rattling prevention portion 60 is disposed on the side closer to the connecting portion 53, contrary to the second claw portion 59. The retaining tool rattling prevention portion 60 is configured to be able to abut against the inner surface portion of the inner cover 2 when the first claw portion 56 and the second claw portion 59 are biting into the inner cover 2. As shown in FIG. 3(A), the retaining tool rattling prevention portion 60 is formed in an inclined shape such that the side closer to the connecting portion 53 is the side (upper side) closer to the outer portion 51, and the portion closest to the connecting portion 53 is the abutting portion 60a. The abutting portion 60a of the retaining tool rattling prevention portion 60 is disposed on the side (lower side) farther from the outer portion 51 by a predetermined amount than the tip portion of the second claw portion 59, as shown in FIG. 6(B), and can first abut against the inner surface portion of the fourth inner cover 24 when the second claw portion 59 is biting into the inner surface portion of the inner cover 2. By the abutting portion 60a of the retaining tool rattling prevention portion 60 abutting against the inner cover 2, the rattling of the retaining tool 5 is suppressed.

[0053] (Retaining action portion) As shown in FIG. 7, the retaining tool 5 is provided with a retaining action portion 71 that exhibits a retaining action of preventing relative detachment between the fourth inner cover 24 and the outer cover 3 by locking against the inner surface portion of the outer cover 3 (the first outer cover 31 or the second outer cover 32) when attached to the fourth inner cover 24. Incidentally, FIG. 7 shows an enlarged cross-sectional view of the right side portion of the connection location between the fourth inner cover 24 and the first outer cover 31 in FIG. 1.

[0054] As shown in FIGS. 3(A) and 7, the retaining action portion 71 is constituted by the inclined portion 54 of the outer portion 51, and as shown in FIG. 7(B), by abutting the inclined portion 54 against the retaining locking portion 35 of the outer cover 3, it locks against the inner surface portion of the outer cover 3 and exhibits a retaining action.

[0055] When the retaining member 5 is attached to the end of the fourth inner cover 24, as shown in Fig. 7(A), the inclined portion 54 of the outer portion 51 is in an inclined posture such that it approaches the inner surface of the first outer cover 31 more towards the tip side (lower side) of the outer portion 51. The inner surface of the first outer cover 31 is provided with a retaining locking portion 35 that protrudes inward. This retaining locking portion 35 is arranged over the entire circumferential length of the first outer cover 31 by protruding a part of the fixture attachment portion 34 inward (see Fig. 4). Returning to Fig. 7(A), when the first outer cover 31 is externally fitted and connected to the end of the fourth inner cover 24, since the fourth inner cover 24 and the first outer cover 31 ensure a double insertion allowance, the inclined portion 54 of the retaining member 5 and the retaining locking portion 35 of the first outer cover 31 are in a separated state.

[0056] At this time, if for some reason the fourth inner cover 24 and the first outer cover 31 move relative to each other, the double insertion allowance between the fourth inner cover 24 and the first outer cover 31 will disappear, and there is a possibility of relative detachment between the fourth inner cover 24 and the first outer cover 31. Therefore, even if relative movement occurs between the fourth inner cover 24 and the first outer cover 31, as shown in Fig. 7(B), by bringing the inclined portion 54 of the retaining member 5 into contact with the retaining locking portion 35 of the first outer cover 31, further relative movement is blocked, preventing relative detachment between the fourth inner cover 24 and the first outer cover 31.

[0057] As shown in FIG. 7(B), when the inclined portion 54 of the retaining member 5 abuts against the retaining locking portion 35 of the first outer cover 31, a force acting in the direction of coming off from the fourth inner cover 24 (refer to the arrow in FIG. 7(B)) acts on the retaining member 5. However, as shown in FIG. 6, when this force (refer to the arrow in FIG. 6) acts, a force acting in the biting-in direction acts on the first claw portion 56 and the second claw portion 59. Therefore, the biting-in force of the first claw portion 56 and the second claw portion 59 becomes strong, and the retaining member 5 can be held in a state where it is attached to the end portion of the fourth inner cover 24 without coming off from the fourth inner cover 24, and relative detachment between the fourth inner cover 24 and the first outer cover 31 can be appropriately prevented.

[0058] The retaining member 5 is provided with not only a retaining action portion 71 but also a displacement preventing action portion 72 that exhibits a displacement preventing action for preventing displacement of the split fourth inner cover 24a as shown in FIG. 6, and a fitting displacement preventing action portion 73 that exhibits a fitting displacement preventing action for preventing fitting displacement between the fitting portions 4 in the split fourth inner cover 24a as shown in FIG. 8(B).

[0059] (Displacement preventing action portion) As shown in FIGS. 3(A) and 6, the displacement preventing action portion 72 is configured to include an outer portion 51, a pair of left and right inner standing wall portions 58, a first claw portion 56, and a second claw portion 59 in the retaining member 5. As shown in FIG. 6, the displacement preventing action portion 72 forms a sandwiching body 74 by the outer portion 51 and the pair of left and right inner standing wall portions 58, and sandwiches the inner surface side and the outer surface side of the split fourth inner cover 24a with this sandwiching body 74. The first claw portion 56 and the second claw portion 59 (corresponding to claw portions) disposed on the outer portion 51 and the pair of left and right inner standing wall portions 58 that form the sandwiching body 74 bite into both the inner surface side and the outer surface side of the split fourth inner cover 24a.

[0060] In this way, as shown in Fig. 6, the misalignment prevention action part 72 engages in a state of sandwiching the inner surface side and the outer surface side of the divided fourth inner cover 24a by the outer part 51, the pair of left and right inner standing wall parts 58, the first claw part 56, and the second claw part 59, thereby preventing the divided fourth inner cover 24a from moving and exerting a misalignment prevention action for preventing misalignment of the divided fourth inner cover 24a (corresponding to the divided body).

[0061] In a state where the retaining member 5 is attached to the end of the fourth inner cover 24, as shown in Fig. 6, the end of the divided fourth inner cover 24a is brought into contact with the connecting part 53 of the retaining member 5. Thereby, the connecting part 53 can also prevent the movement of the divided fourth inner cover 24a, so the connecting part 53 can also be provided as the misalignment prevention action part 72.

[0062] (Fitting disengagement prevention action part) As shown in Figs. 3(A) and 8(B), the fitting disengagement prevention action part 73 is configured to include an inner central part 57 and a pair of left and right inner standing wall parts 58 in the retaining member 5. As shown in Figs. 5(B) and 7(B), the fitting disengagement prevention action part 73 surrounds the fitted fitting parts 4 by the inner central part 57 and the pair of left and right inner standing wall parts 58, thereby preventing the fitting disengagement of the fitting parts 4.

[0063] As shown in Fig. 5(A), each of the two divided fourth inner covers 24a is provided with fitting parts 4 at both ends in the circumferential direction, and the cylindrical fourth inner cover 24 is formed by fitting and connecting the fitting parts 4 to each other. When attaching the retaining member 5 to the end of the fourth inner cover 24, the retaining member 5 is attached to the fitted fitting parts 4. As shown in Fig. 3(A), the retaining member 5 is provided with an inner central part 57 and a pair of left and right inner standing wall parts 58 as an inner part 52, so a space 61 surrounded in three directions by the inner central part 57 and the pair of left and right inner standing wall parts 58 is formed. Therefore, as shown in Fig. 5(A), the retaining member 5 can be attached to the fitted fitting parts 4 by inserting the fitted fitting parts 4 into this space 61.

[0064] In this way, when the retaining member 5 is attached to the engaged fitting portions 4, as shown in FIGS. 5(B) and 8(B), the inner central portion 57 and the pair of left and right inner standing wall portions 58 can surround the inner side and both circumferential sides of the fourth inner cover 24 with respect to the engaged fitting portions 4.

[0065] Thus, for example, as shown by the arrow in FIG. 8(A), even if an external force acts obliquely from the outer side to the inner side of the fourth inner cover 24, as shown in FIG. 8(B), the inner central portion 57 and the pair of left and right inner standing wall portions 58 can restrict the movement of the engaged fitting portions 4 in three directions, namely, the inner side and both circumferential sides of the fourth inner cover 24, and can appropriately prevent the fitting portions 4 from coming off.

[0066] As shown in FIG. 8(B), the inner central portion 57 and the pair of left and right inner standing wall portions 58 surround the engaged fitting portions 4, and by coming into contact with the fitting portions 4, they restrict the movement of the fitting portions 4 in the fitting-off direction. Therefore, the inner central portion 57 and the pair of left and right inner standing wall portions 58 are provided as the surrounding portion 75 and the restricting wall portion 76.

[0067] Incidentally, when the retaining member 5 is attached to the engaged fitting portions 4, in the longitudinal direction of the fourth inner cover 24 with respect to the engaged fitting portions 4, the connecting portion 53 of the retaining member 5 will exist. By this connecting portion 53, the movement of the engaged fitting portions 4 in the longitudinal direction of the fourth inner cover 24 is also restricted.

[0068] As described above, since the fourth inner cover 24 is shorter in length than the other first to third inner covers 21 to 23, the length at which the fitting portions 4 fit together is shorter. Therefore, the fourth inner cover 24 may cause the fitting portions 4 to become disengaged by receiving a smaller external force than the other first to third inner covers 21 to 23. For this reason, in the fourth inner cover 24 having a short length, by exerting a fitting-disengagement preventing action by the fitting-disengagement preventing action portion 73 to prevent the fitting portions 4 in the divided fourth inner cover 24a from becoming disengaged, it becomes particularly useful.

[0069] Regarding the inner cover 2, by aligning the positions of the two divided fourth inner covers 24a (corresponding to the divided bodies) and fitting the fitting portions 4 together, the fitting portions 4 can be fitted together without causing misalignment of the divided fourth inner covers 24a, and the fourth inner cover 24 can be brought into an assembled state. In maintaining this assembled state, the fourth inner cover 24 can be maintained in the assembled state by preventing misalignment of the divided fourth inner covers 24a by the misalignment preventing action portion 72, and the fourth inner cover 24 can also be maintained in the assembled state by preventing the fitting portions 4 from becoming disengaged by the fitting-disengagement preventing action portion 73. Therefore, the assembled state maintaining action portion that exerts an assembled state maintaining action for maintaining the fourth inner cover 24 in the assembled state can be configured by at least one of the misalignment preventing action portion 72 and the fitting-disengagement preventing action portion 73.

[0070] As described above, the retaining tool 5 is provided with a retaining action portion 71, a misalignment preventing action portion 72, and a fitting-disengagement preventing action portion 73, and in a state of being attached to the inner cover 2, it exhibits three functions of a retaining action, a misalignment preventing action, and a fitting-disengagement preventing action. Thereby, at the connection portion between the inner cover 2 and the outer cover 3, by using the retaining tool 5, a retaining structure having these three functions can be formed, not only preventing relative detachment between the inner cover 2 and the outer cover 3, but also maintaining the inner cover 2 in an appropriate state and appropriately maintaining the connection state between the inner cover 2 and the outer cover 3.

[0071] Regarding the retaining member 5, for example, it can be manufactured by punching and bending a metal plate. In this way, by making the retaining member 5 made of metal, the first claw portion 56 and the second claw portion 59 that can be properly engaged can be formed. Moreover, by making the retaining member 5 into a thin plate shape made of metal, even in a narrow space such as between the outer surface portion of the inner cover 2 and the inner surface portion of the outer cover 3 at the connection portion between the inner cover 2 and the outer cover 3, it can enter that space and can be properly installed at the end portion of the inner cover 2.

[0072] As shown in FIG. 2, since there are five connection portions between the inner cover 2 and the outer cover 3, at each of these five connection portions, the retaining member 5 is attached to the end portion of the inner cover 2, and not only is it possible to prevent relative detachment between the inner cover 2 and the outer cover 3 at all five locations, but also the inner cover 2 can be maintained in an appropriate state, and the connection state between the inner cover 2 and the outer cover 3 can be appropriately maintained as a retaining structure.

[0073] Here, as shown in FIG. 7(B), when the retaining action portion 71 exerts a retaining action, an explanation will be added regarding the retaining locking portion 35 which is the contact object with which the inclined portion 54 of the retaining member 5 comes into contact.

[0074] As shown in FIG. 4, in the first outer cover 31, the retaining locking portions 35 are arranged at both left and right end portions and the lower end portion which are the connection portions of the inner cover 2 in a state extending over the entire circumferential length. In the second outer cover 32, the retaining locking portions 35 are arranged at the upper end portion and the right end portion which are the connection portions of the inner cover 2 in a state extending over the entire circumferential length. In this way, since the retaining locking portions 35 are arranged at the end portions which are the connection portions of the inner cover 2 on the outer cover 3, at any connection portion between the inner cover 2 and the outer cover 3, by the inclined portion 54 of the retaining member 5 coming into contact with the retaining locking portion 35, the retaining action for preventing relative detachment between the inner cover 2 and the outer cover 3 can be appropriately exerted.

[0075] This anti-loosening locking portion 35 was originally provided for use in another application. For example, when fixing the inner cover 2, the outer cover 3, etc. to a wall surface or the like using a fixture, the fixture can be inserted into the outer cover 3 through the gap between the inner cover 2 and the outer cover 3, and the fixture can be hooked on the anti-loosening locking portion 35 and locked.

[0076] In this way, the anti-loosening locking portion 35 is used for the purpose of fixing the inner cover 2 and the outer cover 3, and the anti-loosening locking portion 35 is directly used as the contact target of the inclined portion 54 of the anti-loosening tool 5 to exert the anti-loosening effect. Thereby, in order to exert the anti-loosening effect, it is not necessary to newly provide the anti-loosening locking portion 35, and the anti-loosening effect can be exerted by making use of a member used for another application, and the configuration can be simplified accordingly.

[0077] When installing the inner cover 2, the outer cover 3, the anti-loosening tool 5, etc., as the construction procedure, the pipe installation process, the inner cover installation process, the anti-loosening tool installation process, and the outer cover installation process can be sequentially performed. Incidentally, the order of each process can be appropriately changed according to the construction situation and the like.

[0078] The pipe installation process is a process of installing the pipe 1 to the installation target portion such as a wall surface using a pipe fixing tool such as a pipe band. The inner cover installation process is a process of installing the inner cover 2 so as to cover the periphery of the installed pipe 1. For example, as shown in FIG. 4, the fourth inner cover 24 (inner cover 2) can be installed in an assembled state by covering the pipe 1 with the half-divided split fourth inner cover 24a (split body).

[0079] The retaining member attachment step is a step of attaching a retaining member 5 to the end of the inner cover 2 in the assembled state. For example, as shown in FIG. 5(A), the retaining member 5 can be attached to the fitting portion 4 fitted in the fourth inner cover 24. The outer cover attachment step is a step of attaching the outer cover 3 in a state of being externally fitted and connected to the end of the inner cover 2. For example, as shown in FIG. 4, the half-split first outer cover 31a is fitted and connected so as to cover one end of the fourth inner cover 24 (inner cover 2) from the outside to assemble the first outer cover 31, and the first outer cover 31 is attached in a state of being externally fitted and connected to one end of the fourth inner cover 24. For the other end of the fourth inner cover 24, the half-split second outer cover 32a is fitted and connected so as to cover it from the outside to assemble the second outer cover 32, and the first outer cover 31 can be attached in a state of being externally fitted and connected to the other end of the fourth inner cover 24.

[0080] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of the embodiments described below are not limited to being applied individually, and can also be applied in combination with the configurations of other embodiments.

[0081] (1) In the above embodiment, the outer cover 3 is used to connect the linear inner covers 2. Conversely, the inner cover 2 can also be used to connect the linear outer covers 3, and the use of the inner cover 2 and the outer cover 3 can be appropriately changed according to the application.

[0082] (2) In the above embodiment, the inner cover 2 and the outer cover 3 are formed in a cylindrical shape, but the shapes of the inner cover 2 and the outer cover 3 can be appropriately changed.

[0083] (3) In the above-described embodiment, as shown in FIGS. 1 and 2, the anti-disengagement structure according to the present invention was exemplified at the branch or confluence point of the pipe 1. However, for example, the anti-disengagement structure according to the present invention can also be applied to the bent path portion where the pipe 1 is bent and arranged, and the location where the anti-disengagement structure according to the present invention is applied in the pipe path can be changed as appropriate.

[0084] (4) In the above-described embodiment, the anti-disengagement structure using the anti-disengagement tool 5 was exemplified. However, the shape and configuration of the anti-disengagement tool 5 can be changed as appropriate, as long as it exhibits an anti-disengagement effect to prevent the relative disengagement between the inner cover 2 and the outer cover 3, and exhibits an assembly state maintaining effect to maintain the assembled state in which a plurality of divided bodies are combined with respect to the inner cover 2.

[0085] (5) In the above-described embodiment, in order to exhibit the anti-disengagement effect, the anti-disengagement locking portion 35 that contacts the inclined portion 54 of the anti-disengagement tool 5 is provided on the inner surface portion of the outer cover 3. However, this anti-disengagement locking portion 35 can also be omitted. In this case, for example, the anti-disengagement effect can be exhibited by abutting and locking the tip of the inclined portion 54 of the anti-disengagement tool 5 against the inner surface portion of the outer cover 3, or by providing a claw portion or the like on the inclined portion 54 that bites into the inner surface portion of the outer cover 3.

Explanation of Reference Numerals

[0086] 1 Pipe 2 Inner Cover 3 Outer Cover 4 Fitting Portion 5 Anti-disengagement Tool 24a Divided Fourth Inner Cover (Divided Body) 56 First Claw Portion (Claw Portion) 59 Second Claw Portion (Claw Portion) 70 Mounting Portion (Outer Portion 51, Inner Portion 52, Connecting Portion 53) 71 Anti-disengagement Action Portion (Inclined Portion 54) 72 Misalignment Prevention Action Portion (Outer Portion 51, Inner Upright Wall Portion 58, First Claw Portion 56, Second Claw Portion 59) 73 Chimeric detachment prevention action part (inner central part 57, inner standing wall part 58) 74 Clamping body (outer part 51, inner standing wall part 58) 75 Surrounding part (inner central part 57, inner standing wall part 58) 76 Regulation wall part (inner central part 57, inner standing wall part 58)

Claims

1. A retaining structure for preventing relative removal of an inner cover for piping and an outer cover for piping that is fitted and connected to an end of the inner cover, comprising: A retainer is provided which is freely attachable to an end of the inner cover and which, when attached to the inner cover, engages with the inner surface of the outer cover to prevent the inner cover and the outer cover from coming off relative to each other. The stopper includes an assembly state maintaining portion that maintains the inner cover in an assembled state when the stopper is attached to the inner cover, The inner cover is provided with a plurality of fitting portions, The inner cover is in an assembled state by fitting the fitting portions together, The fitting portion is disposed on the inside of the inner cover, the assembled state maintaining action portion has a surrounding portion surrounding the periphery of the mated mating portions, and is provided with a mating disengagement prevention action portion that exerts a mating disengagement prevention action to prevent disengagement of the mating portions surrounded by the surrounding portion, When the anti-slip device is attached to the inner cover, the surrounding portion of the anti-disengagement portion is disposed on the inside of the inner cover, and a locking portion that engages with the inner surface of the outer cover is disposed on the outside of the inner cover.

2. The stopper includes a clamping body that clamps the inner surface and the outer surface of the inner cover when the stopper is attached to the inner cover, The retaining structure according to claim 1 , wherein the surrounding portion is disposed on the inner surface side of the inner cover of the clamping body.

3. The surrounding portion is provided with a restricting wall portion that restricts the movement of the engaged fitting portions in a direction in which the engaged fitting portions are disengaged from each other, 3. The retaining structure according to claim 1, wherein the restricting wall portion is provided with a second claw portion extending in a direction in which the restricting wall portion stands and engaging with an inner surface of the inner cover.

4. The stopper includes a clamping body that clamps the inner surface and the outer surface of the inner cover when the stopper is attached to the inner cover, The second claw portion is disposed on an inner surface side of the inner cover of the clamping body, The retaining structure according to claim 3 , wherein the outer surface side of the inner cover of the clamping body is provided with a first claw portion that bites into the outer surface side of the inner cover.

5. A retainer for use in a retaining structure for preventing relative removal of an inner cover for piping and an outer cover for piping that is fitted and connected to an end of the inner cover, An attachment portion that can be attached to an end portion of the inner cover; a retaining portion that, when attached to the inner cover, engages with an inner surface of the outer cover to prevent the inner cover and the outer cover from being relatively separated from each other; an assembled state maintaining action part that exerts an assembled state maintaining action for maintaining the inner cover in an assembled state in which the fitting parts are fitted together when the inner cover is attached to the inner cover, the assembled state maintaining portion has a surrounding portion that surrounds the periphery of the mated fitting portions on the inside of the inner cover, and is provided with a fitting disengagement preventing portion that exerts a fitting disengagement preventing action to prevent disengagement of the fitting portions surrounded by the surrounding portion, When attached to the inner cover, the anti-slip device has the surrounding portion of the anti-detachment portion disposed on the inside of the inner cover, and a locking portion that locks onto the inner surface of the outer cover is disposed on the outside of the inner cover.

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