JP4745114B2 - Piping material protection duct - Google Patents

Description

  The present invention relates to a long piping material protection duct composed of a base that accommodates and holds a pipe material that is piped while being restricted in the longitudinal direction due to thermal expansion, and a lid that is covered by the base. .

  Both ends of the long piping material protection duct (hereinafter sometimes simply referred to as “protection duct”) consisting of a base and a lid and containing and protecting the pipe material inside are the corners at the entrance and the corners at the exit The flat bent portion is connected to another long protective duct via a bent joint (see Patent Document 1). Further, the protective duct is accommodated in the accommodating portion of the base in a state where the protective duct is in contact with the bottom wall portion of the base or the support portion erected from the bottom wall. On the other hand, both ends of the long tubular material accommodated and protected by the long protective duct are separated from each other through a joint pipe called an “elbow” having an L shape, a T shape, or the like. Connected to. Therefore, since the both ends of the connected pipe material are in a restrained state, extension due to thermal expansion is restricted.

  For this reason, when high-temperature hot water is passed through the pipe material, the bent joint covering both ends of the pipe material is removed, or the pipe material is removed from the bottom wall portion of the base. In some cases, the lid body may be removed due to meandering deformation (waving deflection deformation) in a substantially vertical plane. In addition, when the pipe material meanders and deforms due to thermal expansion, both side portions of the pipe material are held by the pipe material holding walls of the base in the direction (a direction substantially parallel to the bottom wall of the base). Therefore, the pipe material is meanderingly deformed in a plane substantially perpendicular to the bottom wall portion, and as a result, the tube material is meanderingly deformed toward the lid.

And when the pipe material returns to room temperature after passing high-temperature hot water, the pipe material returns to an elongated linear shape that is substantially the original shape due to thermal contraction, but the bent joint or lid removed by the thermal expansion of the pipe material The body was left in the “disengaged” state, and it was necessary to reconstruct it.
Japanese Utility Model Publication No. 6-16799

  It is an object of the present invention to prevent the bent joints at both ends of the protective duct or the lids covered by the base from being removed even when the pipe material is meandering due to thermal expansion.

  The invention of claim 1 for solving the above problem comprises a base that accommodates and holds a pipe material that is piped while being restricted in its longitudinal extension due to thermal expansion, and a lid that is covered by the base. The base has a configuration in which an opening for inserting a tube material is formed between the distal ends of a pair of left and right tube material holding walls, and an opposing space of each tube material holding wall serves as a tube material holding portion that accommodates and holds the tube material. A long pipe material protection duct, wherein the pipe material holding portion of the base has a bottom wall portion side space formed between the bottom wall portion of the base and the pipe material to be held. It can be held in the air, and the openings of the pair of pipe holding walls are expanded so that the pipe is meanderingly deformed in a plane substantially perpendicular to the bottom wall of the base due to thermal expansion. The opening side escape preventing force that prevents the pipe material from partially escaping from the opening is provided with the pair of pipes. By expanding the bottom wall portion side of the holding wall and setting the pipe material to be larger than the bottom wall portion side escape preventing force that escapes to the bottom wall portion side in the bottom wall portion side space portion, at the time of the meandering deformation of the pipe material, It is characterized in that the tube material is configured to easily escape to the bottom wall side.

  According to the first aspect of the present invention, at the time of thermal expansion of the pipe material, the opening side escape prevention force that prevents the pipe material from partially escaping from the opening by expanding the opening side of the pair of pipe material holding walls. The bottom wall portion side of the pair of tube material holding walls is set to be larger than the bottom wall portion side escape prevention force for preventing the pipe material from escaping to the bottom wall portion side in the bottom wall portion side space portion. Therefore, the pipe material to be extended by thermal expansion first deforms so as to escape in the direction of the bottom wall portion side space portion by expanding the bottom wall portion side of the pair of tube material holding walls having a small deformation resistance. Between the parts deformed by escaping to the bottom wall part side of the base along the longitudinal direction of the tube material, the normal accommodation holding posture by the pair of tube material holding walls is maintained as it is, or a pair of The opening part side of the pipe material holding wall is slightly expanded, and a part of the opening part side is generated.

  Thus, the base which comprises the protection duct which concerns on invention of Claim 1 hold | maintains a pipe material in the air arrangement | positioning state by a pipe material holding | maintenance part, and at the time of the said meandering deformation of a pipe material, a pipe material tends to escape to the bottom wall part side. Since the pipe material to be thermally expanded is configured to be meanderingly deformed in a plane substantially perpendicular to the bottom wall portion of the base, one end portion of the protective duct is formed even during the thermal expansion of the pipe material. Alternatively, the bent joints connected to both ends or the lid attached to the base are not removed, and the protection state of the pipe material by the protective duct can be maintained as it is. In addition, when the passage of high-temperature hot water disappears and the tube material returns to room temperature, the portion of the meandering tube material that escaped to the bottom wall side of the base, or partly escaped to the opening side. The portion returns to the linear shape which is substantially the original shape due to heat shrinkage, thereby entering the tube material holding portion between the pair of tube material holding walls and returning to the original aerial arrangement posture.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a free end portion is formed on the bottom wall portion side of the pair of tube material holding walls forming the tube material holding portion.

  According to the invention of claim 2, since the free end portion is formed on the bottom wall portion side of the pair of tube material holding walls, the portion of the free end portion is compared with the other portion during the thermal expansion of the tube material. Therefore, since the tube material is easily deformed, the tube material easily deforms meanderingly toward the bottom wall portion side of the base, and the operational effect of the invention of claim 1 is easily achieved.

  Further, in the invention of claim 3, in the invention of claim 2, each pipe material holding wall forming the base is connected to the outer wall portion standing from the bottom wall portion and the opening side of the outer wall portion, The bottom wall portion side is constituted by an inner wall portion having a free end portion, and a pipe material holding portion is formed by a pair of opposed inner wall portions.

  According to the invention of claim 3, since the structure in which the opening side escape prevention force of the pipe material held by the pair of pipe material holding walls is larger than the bottom wall side escape prevention force can be reliably realized, the meandering deformation of the pipe material In some cases, the pipe material can be surely escaped to the bottom wall side.

  In the present invention, the pipe material is held in the air by the pair of pipe material holding walls constituting the base of the piping material protection duct, and thus is held by the pair of pipe material holding walls at the time of meandering deformation of the pipe material due to thermal expansion. The pipe material is configured to be able to escape to the bottom wall side of the base, and the pipe material holding wall that holds the pipe material in the aerial state is when the pipe material tries to escape against its escape prevention force. In order to make it easier for the pipe material to escape from the opening side toward the bottom wall side, the size of each escape prevention force is positively varied, so when meandering deformation of the pipe material due to thermal expansion, The tube material can easily escape to the bottom wall portion side of the base through the space formed between the tube material and the bottom wall portion. Thus, at the time of meandering deformation of the pipe material due to thermal expansion, the pipe material held by each pipe material holding wall can be easily deformed meandering by escaping to the side opposite to the lid, and the pipe material can be obtained by the meandering deformation. Therefore, the bent joints connected to both ends of the protective duct in the longitudinal direction are not removed, or the lid is not removed.

  Hereinafter, the present invention will be described in more detail with reference to a plurality of examples.

First, with reference to FIGS. 1 and 2, it will be described piping material protective duct D ₁ of the first embodiment. Figure 1 is an exploded perspective view of a protective duct D _1, FIG. 2 is a cross-sectional view of the base V _1. The protective duct D ₁ is long and includes a base V ₁ on which a pipe material holding portion for accommodating and holding the pipe material is formed, and a lid L ₁ that is covered with the base V ₁ and assembled together. Composed.

As shown in FIGS. 1 and 2, the base V ₁ includes a base body 1 that is fixed in close contact with a wall surface and the like, and a portion that is slightly inward of both ends in the width direction of the base body 1. and a pair of the tube holding wall W ₁ which is erected. Base body 1, with both ends in the width direction is an adhesion portion 1a in close contact with the wall surface or the like, the portion occupying a central majority of the width direction, held by the pair of the tube holding wall W ₁ has a bottom wall 1b which forms a bottom wall portion side space S ₁ between the tube P, by being formed in a stepped shape are connected by inclined connecting portion 1c with respect to the fitting part 1a, It is a part that does not adhere to the wall surface. A inner surface of the bottom wall portion 1b (the side of the bottom wall side space S _1), a central portion in the width direction, a base V ₁ via screws (not shown) on the wall surface or the like A positioning groove 2 having a V-shaped cross section for positioning the screw at the time of fixing is formed over the entire length. In addition, the wide groove formed on the back surface of the base body 1 and the narrow groove formed on both sides of the wide groove are spacers interposed between the base body 1 and the wall surface as necessary. The fitting grooves 1d and 1e (not shown) are shown.

Next, with reference to FIG. 2, the pair of tube material holding walls W ₁ forming the tube material holding portion 3 capable of holding the tube material P in the air-arranged state will be described in detail. Each tube holding wall W ₁ is arranged with an inner wall portion 4 and an outer wall portion 5, which are arranged at a predetermined interval and the main body has an arcuate cross section, and each of the inner wall portion 4 and the outer wall portion 5. The distal end portion (referring to the portion farthest from the base main body 1 with respect to the base main body 1) is connected by the connecting plate portion 6, thereby being connected to the outer wall portion 5 in the inner wall portion 4. The end opposite to the side is a free end 4c. The inner wall portion 4 includes an inner wall main body portion 4 a having an arc shape in cross section, and an upright plate portion 4 b disposed between the inner wall main body portion 4 a and the connecting plate portion 6. On the other hand, the outer wall portion 5, and a cross-sectional arcuate outer wall body portion 5a having an inner wall body 4a same arc center C ₀ and in which the arcuate cross section, both ends in the width direction of the bottom wall 1b of the base body 1 And an inclined plate portion 5c that connects the outer wall main body portion 5a and the upright plate portion 5b. The inner wall main body 4a and the outer wall main body 5a having an arcuate cross section are arranged in parallel to each other, and the space between the both 4a and 5a is a deformation-permissible space that allows the inner wall 4 to bend and deform with respect to the outer wall 5. 7 Also, between the tip portions of the pair of the tube holding wall W ₁ of the base V ₁ it was, has an opening 8 for tubing insertion to be inserted into the tubing holder 3 and push the tubing P. A concave portion formed by the upright plate portion 5b and the inclined plate portion 5c constituting the outer wall portion 5 and the close contact portion 1a and the inclined connecting portion 1c constituting the base body 1 is a lid L ₁ described later. The engaging groove 9 is engageable with the engaging body 23.

Since the tube material holding wall W ₁ of the base V ₁ is composed of the inner wall portion 4 and the outer wall portion 5 that are connected at the tip end side via the connecting plate portion 6, the tube material between the pair of tube material holding walls W _1. The inner wall part 4 and the outer wall part 5 can be flexed and deformed independently both during the insertion and insertion of the pipe material P into the holding part 3 and during storage after insertion. That is, as shown in FIG. 5C, the inner wall portion 4 bends and deforms with the connecting portion having the smallest thickness connecting the upright plate portion 4 b and the connecting plate portion 6 as the deformation base point portion 11. In addition, the outer wall portion 5 is a portion of the easily deformable groove 12 formed along the longitudinal direction at the center portion in the width direction of the outer wall main body portion 5a at the first deformation base point portion 13 or the base end portion of the outer wall main body portion 5a. The second deformation base point portion 14 is bent and deformed. The deformation directions of the inner wall portion 4 and the outer wall portion 5 forming the tube material holding wall W ₁ centering on the respective deformation base points 11, 13 (14) are opposite to each other, and the pair of tube material holding walls W _1. It is possible to hold a plurality of types of pipe materials having different outer diameters. Further, in the state of holding the pipe material P by a pair of the tube holding wall W _1, between the bottom wall 1b of the base body 1 of the pipe material P, since the bottom wall side space S ₁ is formed The pipe P is held in the air-arranged state by the pair of pipe holding walls W ₁ . In FIG. 2, the pipe P held by the pipe holder 3 between the pair of pipe holding walls W ₁ has the smallest outer diameter that can be held, and the pair of pipe holding walls W in the holding state. ₁ is hardly deformed. The width E of the opening 8 between the inner walls 4 is smaller than the outer diameter K of the smallest tube material P that can be held.

In addition, as described in the section “Background Art”, when hot water is poured into the pipe P, the long pipe P with both ends regulated through the bottom wall side space S ₁ . The base body 1 is bent and deformed toward the bottom wall portion 1b, or is bent toward the outside of the base V ₁ through the opening 8, and as a result, the long pipe P is different in each part. In order to bend and deform, the entire body undergoes meandering deformation in a plane substantially perpendicular to the bottom wall portion 1b of the base body 1. Here, the configuration of the base V ₁ is as described above, and the ends on the side of the bottom wall portion 1b of the base body 1 of the pair of inner wall portions 4 that directly form the pipe material holding portion 3 are free. In addition to the end portion 4 c, the opposite end portions of the pair of inner wall portions 4 are integrally connected to the distal end portion of the outer wall portion 5 via the connecting plate portion 6. Therefore, when the pipe P held by the pair of pipe holding walls W ₁ undergoes meandering deformation due to thermal expansion, the opening that prevents the pipe P from escaping from the opening 8 toward the outside of the base V _1. The part-side escape prevention force is larger than the bottom wall part-side escape prevention force that prevents the base body 1 from escaping toward the bottom wall part 1b. Therefore, when the pipe material P held in the air-arranged state by the pair of pipe material holding walls W ₁ is subjected to thermal expansion and undergoes meandering deformation, it bends and deforms toward the bottom wall portion 1 b side of the base body 1. It becomes easy (it becomes easy to escape).

The lid body L ₁ includes a top wall portion 21 having a flat mountain shape and a pair of side wall portions 22 integrally formed at both lower end portions of the top wall portion 21. A hollow engagement body 23 that is engaged with each engagement groove 9 of the base V ₁ is formed at the lower end of the side surface over the entire length.

Next, with reference to FIG. 3 thru | or FIG. 5, the case where hot water passes through the piped pipe P and is thermally expanded is demonstrated. FIG. 3 shows that the long protective duct D ₁ is connected to each of the bent corner joints A ₁ and A ₂ for the outgoing corner and the incoming corner at the outgoing corner 62 and the incoming corner 63 of the wall 61 of the building. FIG. 4 is a plan sectional view of the state connected to the protective duct D ₁ , and FIG. 4 is a schematic plan view showing only the center line CL ₀ when the pipe P is meanderingly deformed due to thermal expansion. , (B) and (c) are cross-sectional views taken along lines X ₁ -X ₁ , X ₂ -X ₂ and X ₃ -X _{3 in} FIG. 4, respectively. In the protruding corner portion 62 and the entering corner portion 63 of the wall 61 of the building, the long tubular material P is connected to another long tubular material P via an elbow 64. Further, the protective ducts D ₁ fixed to the respective wall bodies 61 orthogonal to each other are connected by the bent joints A ₁ and A ₂ for the protruding corners and the entering corners, and the elbows 64 are connected to the bent joints A ₁ and A ₂ , respectively. ₁ and A ₂ are accommodated and held. Each bend joint A _1, A ₂ is covering a base V ₁₁ (V ₁₂₎ which is fixed to the outer corner portion 62 and the inner corner portion 63 of the wall 61, to the base V ₁₁ (V ₁₂₎ And a lid L ₁₁ (L ₁₂ ).

Flowing temperature water in the contained tube P to protect the duct D ₁ of the first embodiment, the pipe material P by the thermal expansion tries to longitudinally extending, constitutes a base V ₁ of the protective duct D ₁ since towards the opening side escape preventing force of the pair of the tube holding wall W ₁ there are greater than the bottom wall portion side escape blocking force, as shown in FIGS. 4 and 5 (b), the pipe material P is the thermal expansion Is deformed so as to escape to the bottom wall portion 1b side, and the maximum deflection portion Pa with the largest deflection toward the bottom wall portion 1b side greatly deforms the free end portion 4c side of the pair of inner wall portions 4 It almost escapes from the tube material holding part 3 and comes into contact with the bottom wall part 1b. In FIG. 4, “one-dot chain line” and “two-dot chain line” indicate the center CL ₀ of the pipe material P before and after thermal expansion (linear expansion), respectively.

As shown in FIG. 4, when the maximum deflection portions Pa toward the bottom wall portion 1 b are present on both end sides of the pipe material P, the maximum length toward the opening 8 side is at the center in the longitudinal direction of the pipe material P. One bending portion Pb exists, and one portion Pc that does not bend on either side of the opening 8 and the bottom wall portion 1b exists on both sides of the portion Pb. As shown in FIG. 5, the maximum amount of deflection (δb) of the pipe member P toward the opening 8 is the maximum amount of deflection of the maximum deflection part Pa at which the pipe P is bent toward the bottom wall 1 b side. (.delta.a) much smaller than (.delta.a> [delta] b) is, specific values will depend on the opening side escape preventing force of the pair of the tube holding wall W _1. That is, at the time of thermal expansion, the pipe material P has a structure that easily escapes to the bottom wall portion 1b side, and the pipe material P is greatly meandered and deformed along the longitudinal direction in a state of being largely bent toward the bottom wall portion 1b side. Is possible. In this way, during the thermal expansion of the pipe material P, the pipe material P can be positively released to the side of the bottom wall portion 1b of the base V ₁ and meanderingly deformed, so that the longitudinal extension of the pipe material P can be absorbed. even tubing P is extended by thermal expansion, or remove the bend joint a _1, a ₂ of the two ends, or by the rear surface of the lid L ₁ is pressed by the meandering deformed tubing P, the lid L ₁ It can be prevented from coming off. In FIG. 4, CL ₁ and CL ₂ indicate the center lines of the elbow 64 at the protruding corner portion 62 and the entering corner portion 63, respectively.

Further, as shown in FIG. 5 (a), at the maximum deflection portion Pb of the pipe material P toward the opening 8 side, the pipe material P is in contact with the bottom wall portion 1b of the base body 1 and expands outward. each free end 4c of the deformed pair of inner wall 4 is in contact with a portion of the center line CL ₀ substantially the same height at the outer peripheral surface of contact with the pipe material P to the bottom wall portion 1b. Therefore, when the passage of high-temperature hot water or the like is lost and the pipe material P returns to room temperature and attempts to return to a straight tube shape by heat shrinkage, the pair of inner wall portions 4 that are expanded outwardly deformed are When the pipe P tries to return to the pipe holding part 3 side due to thermal contraction, the pair of inner wall parts 4 gradually follow the original shape due to the elastic restoring force. The pipe P is restored and finally returns to the original holding position. In other words, the shape of the pair of inner wall portions 4 that directly form the tube material holding portion 3 is a pair that is expanded to the maximum with the tube material P having escaped from the tube material holding portion 3 to the bottom wall portion 1b side. It is necessary that the inner wall portion 4 does not hinder the maximum escaped tube material P from being restored to the original tube material holding portion 3.

Next, with reference to FIGS. 6 and 7, the protection duct D ₂ of the second embodiment, a description will be given only the protective duct D ₁ and different parts. 6 (a) and 6 (b) are cross-sectional views of the bases V ₂ and V ₃ constituting the protective ducts D ₂ and D ₃ of Examples 2 and 3, respectively. , (c) are each a cross-sectional view of FIG. 4 of X ₁ -X ₁ line, X ₂ -X _2-wire and X ₃ -X _3-wire in the case of using a protective duct D _2, respectively. Protection duct D ₂ is composed of a base V _2, the lid L ₂ Metropolitan which is covering on the base V _2. Base V ₂ is a configuration in which bottom wall a pair of tube holding wall W ₂ from both ends in the width direction of the 31b of the base body 31 is respectively erected, tubing retaining wall W ₂ is the base body The upright plate portion 32 erected from the bottom wall portion 31 b of the 31, the inclined plate portion 33 inclined outward from the front end portion of the upright plate portion 32, and the front end portion of the inclined plate portion 33 in an upright state. And wall main body 34. The wall main body 34 is composed of an upright plate portion 35 on the proximal end side and an arc plate portion 36 having an arcuate cross section formed at the distal end portion of the upright plate portion 35, and the arc plate portion 36 is divided into two in the width direction. In this case, the thickness (T ₁ ) of the distal end side portion 36a is about twice the thickness (T ₂ ) of the proximal end side portion 36b. That is, both ends of the pair of arc plate portions 36 are free end portions 36c and 36d in a cross-sectional view, and between the upright plate portion 35 and the base end side portion 36b of the arc plate portion 36, A deformation allowing space 37 that allows deformation of the base end side portion 36b of the arc plate portion 36 is formed, and the base end side portions 36b of the pair of arc plate portions 36 are, as shown in FIG. It can be expanded outward. The inner peripheral holding surfaces of the pair of arc plate portions 36 are formed in an arc surface shape having a common arc center C _0, and the center line CL ₀ of the pipe material P held by the pair of arc plate portions 36 is: It coincides with the circle center C _0.

Further, a bottom wall portion side space portion S ₂ is formed between the tube material P held by each arc plate portion 36 of the pair of tube material holding walls W ₂ and the bottom wall portion 31 b of the base body 31. together we are, between the tips of the arc plate 36 of the pair of tube holding wall W _2, openings 39 for the pipe material holding portion 38 which is formed between the arcuate plate 36 to insert the tubing P Is formed. The thickness (T ₁ ) of the distal end side portion 36a of each arc plate portion 36 constituting the pair of tube material holding walls W ₂ is about twice the thickness (T ₂ ) of the proximal end side portion 36b. The distal end side portion 36a of the arc plate portion 36 has a structure that is less likely to be deformed than the proximal end side portion 36b. This, by tubing holder 38 the tube material P held in the thermal expansion between the respective arcuate plates 36 of the pair of tube holding wall W _2, from the pipe material holding portion 38 of the opening 39 or the base main body 31 From the standpoint of preventing escape to either side of the bottom wall portion 31 b, the opening side escape prevention force that prevents escape to the opening 39 side is the bottom wall of the base body 31. It means that it is larger than the bottom wall side escape prevention force which prevents escape to the part 31b side. In other words, when the pipe material P held in the protective duct D ₂ tends to extend in the longitudinal direction due to thermal expansion, it passes through the bottom wall portion side space portion S ₂ toward the bottom wall portion 31 b of the base body 31. The structure is easily deformed (easy to escape). Further, since the lid body L ₂ covered by the base V ₂ has the same shape as the lid body L ₁ , the corresponding portions are denoted by the same reference numerals with “′” and only illustrated. In addition, in FIG. 6, 31a shows the contact | adherence part of the base main body 31. FIG.

Therefore, in the same manner as in the first embodiment, when the pipe material P piped between the protruding corner portion 62 and the entering corner portion 63 of the wall 61 of the building is accommodated and protected in the protective duct D ₂ and hot water is poured. As shown in FIGS. 4 and 7, the pipe material P held on the base V ₂ of the protective duct D ₂ meanders and deforms due to thermal expansion in a plane substantially perpendicular to the bottom wall portion 31 b. Then, in the maximum deflection portion Pa of the bottom wall 31b side of the tube P, as shown in FIG. 7 (b), the base end side part 36b of the arcuate plate portion 36 forming a pair of tube holding wall W ₂ Is expanded outward so that the tube material P abuts against the bottom wall portion 31b of the base body 31, and the maximum deflection portion Pb of the tube material P toward the opening 39 is shown in FIG. as, with distal end portion 36a of the arcuate plate portion 36 forming a pair of tube holding wall W ₂ is flared slightly outwardly, the pipe material P is slightly escape to the side of the opening 39. Here, the deflection amount (δb ′) of the maximum deflection portion Pb toward the opening 39 side of the pipe material P is far more than the deflection amount (δa ′) of the maximum deflection portion Pa toward the bottom wall portion 31b side of the pipe material P. small. Moreover, the deformation resistance on the opening 39 side of the pair of tube holding walls W ₂ (the force required to deform the predetermined amount) is the deformation resistance on the opening 8 side of the pair of tube holding walls W ₁ of the first embodiment. Since it is estimated that the shape is larger than the force, it is estimated that the relationship (Δb ′ / Δa ′) <(Δb / Δa) holds. Therefore, it becomes easier to absorb the elongation in the longitudinal direction of the pipe material P due to the meandering deformation of the pipe material P at the time of thermal expansion.

In the second embodiment, as shown in FIG. 7 (a), the pipe material P is in contact with the bottom wall portion 31b of the base body 31 and escapes from the pipe material holding portion 38 to the maximum. proximal end side 36b of the arcuate plate 36 which constitutes the wall W _2, together with the stretched substantially straight, free end portion 36c of the base end side 36b is the pipe material P contact with the bottom wall 31b approaching the side of the bottom wall portion 31b from the position of the center line CL ₀ of. Therefore, the base end side portions 36b of the pair of arc plate portions 36 that are expanded to the maximum do not prevent the pipe material P from contracting due to thermal contraction and returning to the original pipe material holding portion 38. Is smoothly restored to the original tube material holding portion 38 by heat shrinkage, and in response to the return of the tube material P, the base end side portions 36b of the pair of arc plate portions 36 are also restored to the original arc shape, Half of the bottom wall portion 31b of the pipe material P is held.

Further, the base V ₃ of the protective duct D ₃ of the third embodiment shown in FIGS. 6B and 8 is slightly deformed from the shape of the base V ₂ of the protective duct D ₂ of the second embodiment. The ratio of the opening side escape prevention force and the bottom wall side escape prevention force is increased. That is, as shown in FIG. 6B, a pair of pipe members is formed by forming a bulge portion 41 bulging outward at the base end portion of the upright plate portion 35 constituting the pipe material holding wall W _3. The deformation resistance on the opening 39 side of the holding wall W ₃ is increased. Therefore, when the deflection amounts at the maximum deflection portions Pa and Pb toward the bottom wall portion side and the opening portion side of the pipe material P accommodated in the protective duct D _{3 of the} third embodiment are (δa ′) and (δb ″), respectively. , (Δb ′ / δa ′)> (δb ″ / δa ′). As a result, the expansion ratio of the pipe member P due to thermal expansion increases due to escape to the bottom wall portion side space portion S ₂ formed on the side where the escape prevention force is small. Regarding the illustration of the protective duct D _3, the same parts as those of the protective duct D _{2 of the} second embodiment are denoted by the same reference numerals.

  In addition, with regard to deflection deformation (meandering deformation) in a plane substantially perpendicular to the bottom wall portion of the tube base, there is a maximum deflection portion toward the opening side at the center in the longitudinal direction as described above, and both sides thereof The bending shape with the maximum bending part to the bottom wall side is shown, but the bending shape of the whole pipe material is the restriction force at both ends of the pipe material in the longitudinal direction and the heat in the longitudinal direction due to the thermal expansion of the pipe material. It is determined relatively depending on the relationship of stress, and various forms such as a shape in which each maximum deflection portion to the bottom wall portion side and the opening portion side exists in one place can be considered.

  Also, regarding the piping form of the pipe material, in addition to the case where the pipe is bent at the exit corner and the entrance corner, the same is applied to the case where one end or both ends of the pipe is bent on the same wall surface. By bending and deforming the pipe material in a plane substantially perpendicular to the bottom wall portion of the table, it is possible to absorb the elongation in the longitudinal direction during the thermal expansion of the pipe material.

It is an exploded perspective view of a protective duct D _1. It is a cross-sectional view of the base V _1. The long protective duct D ₁ is connected to each of the other protective ducts D ₁ through the bent joints A ₁ and A ₂ for the corners of the corners and the corners of the corners 61 of the building wall 61. It is a plane sectional view in the state where it was connected to. FIG. 6 is a schematic plan view showing a state in which a pipe P is meanderingly deformed by thermal expansion only by a center line CL ₀ . (A), (b), and (c) are cross-sectional views taken along lines X ₁ -X ₁ , X ₂ -X _2, and X ₃ -X _{3 in} FIG. 4, respectively. (A) and (B) are cross-sectional views of the bases V ₂ and V ₃ constituting the protective ducts D ₂ and D ₃ of Examples 2 and 3, respectively. (A), (b), and (c) are cross-sectional views taken along lines X ₁ -X ₁ , X ₂ -X _2, and X ₃ -X ₃ in FIG. 4 when the protective duct D ₂ is used. It is. (A), (B), and (C) are cross-sectional views taken along lines X ₁ -X ₁ , X ₂ -X _2, and X ₃ -X ₃ in FIG. 4 when the protective duct D ₃ is used. It is.

Explanation of symbols

L ₁ and L ₂ : Lid D _{1 to} D ₃ : Piping material protection duct
P: Tube material
Pa: Maximum deflection of tube material toward bottom wall
Pb: Maximum deflection to the opening side of the pipe
Pc: Non-flexible part of pipe material
S _1, S _2: the bottom wall side space V ₁ ~V _3: base W ₁ to _W-3: tube retaining wall 1b, 31b: bottom wall of the base body
3,38: Tube holding part
4: Inner wall
4c: free end of the inner wall
5: Exterior wall
8, 39: Opening
36c: Free end portion on the bottom wall side of the arc plate portion

Claims (3)

It consists of a base that accommodates and holds the pipe material that is piped with its longitudinal extension restricted by thermal expansion, and a lid that is covered by the base, and the base is the tip of a pair of left and right pipe material holding walls A long pipe material protection duct having a structure in which an opening for inserting a pipe material is formed between the pipe material holding walls and a pipe material holding portion for accommodating and holding the pipe material,
The base material tube holding part has a bottom wall part side space formed between the bottom wall part of the base and the pipe material to be held, and is capable of holding the pipe material in an aerial arrangement state.
In order to cause the tube material to meander and deform in a plane substantially perpendicular to the bottom wall portion of the base due to thermal expansion, the opening portion side of the pair of tube material holding walls is expanded and the tube material partially escapes from the opening portion. The bottom wall portion side that expands the bottom wall portion side of the pair of tube material holding walls to prevent the tube material from escaping to the bottom wall portion side in the bottom wall portion side space portion. Set larger than the escape prevention power,
A piping material protection duct configured so that the pipe material can easily escape to the bottom wall side when the pipe material is meanderingly deformed.   The piping material protection duct according to claim 1, wherein a free end portion is formed on a bottom wall portion side of the pair of tube material holding walls forming the tube material holding portion.   Each tubular material holding wall forming the base is composed of an outer wall portion standing from the bottom wall portion, and an inner wall portion which is connected on the opening side of the outer wall portion and the bottom wall portion side becomes a free end portion. The pipe material protection duct according to claim 2, wherein a pipe material holding portion is formed by a pair of opposed inner wall portions.

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