Wavelet tube

Abstract

To allow a corrugated tube to be vertically inverted in a state of directing a cut portion upward and housing a wiring / piping material in the inside.SOLUTION: A corrugated tube is such that: there is provided a cut portion 5 continuous in an axial direction in one planar pipe wall part among four planar pipe wall parts; one end part in an axial direction of a corrugated tube D' is integrally provided with a connection part C' overlapped by being internally fitted with the other end part of the other corrugated tube D'; the connection part C' is formed with a connection part-cut portion 45 linearly continuous to the cut portion 5; the other end of the other corrugated tube D' can be inserted into the connection part C' of the one corrugated tube D' by making the connection part-cut portion 45 and the cut portion 5 of the other corrugated tube D' coincide with each other; and opposite end edge parts 45a, 45b provided in the connection part-cut portion 45 of the connection part C' are configured to be deformable so as to be shifted along an axial direction of the corrugated tube when twisting and rotating the two or more continuous corrugated tubes D' among the plurality of corrugated tubes D' connected via the connection part C' so as to direct downward the cut portion 5 directed upward.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to a corrugated pipe configured to be laid after accommodating wiring and pipe materials inside with the cutting part facing upward and then inverted so that the cutting part faces downward.

Background Art

[0002] In paragraph "0022" of the specification of Patent Document 1 and FIGS. 6 to 8 of the drawings, there is disclosed a protective pipe 5 for wiring and pipe materials, which is composed of a corrugated pipe with a substantially circular cross-section and has a cutting part 8 provided continuously in its axial direction. First, the wiring and pipe materials 1 are laid on the laying surface, and then, with the cutting part 8 of the protective pipe 5 facing downward, it is pressed against the wiring and pipe materials 1 on the laying surface, so that the cutting part 8 is expanded and the wiring and pipe materials 1 are accommodated inside.

[0003] Also, in paragraph "0025" of the specification of Patent Document 1, it is disclosed that a joint 4 is integrally provided at one longitudinal end of the protective pipe body 2 of the protective pipe 5, and by fitting the joint 4 onto the protective pipe body 3 of another protective pipe 5, a plurality of protective pipes 5 can be connected.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, with the protective pipe 5 disclosed in Patent Document 1, it is necessary to lay the wiring and piping materials on the laying surface first, and it is not possible to lay the protective pipe 5 in advance and then lay the wiring and piping materials beforehand, which imposes constraints on the laying of the wiring and piping materials. Furthermore, unless the cut portion 8 of the protective pipe 5 is aligned along the entire length of the previously laid wiring and piping materials, the cut portion 8 will not expand properly, and moreover, the cut portion 8 is located on the back side (bottom) of the protective pipe 5 and is difficult to see, resulting in poor workability.

[0006] Furthermore, because the cross-section of the protective tube 5 is roughly circular, it has low deformation resistance to external forces and can be easily crushed by falling objects or being stepped on by people, thus failing to adequately perform its function as a protective tube for wiring and piping materials.

[0007] Furthermore, after wiring and piping materials have been housed and laid in multiple protective pipes 5 connected to each other by the joint 4, it is possible to add additional wiring and piping materials by reversing the existing protective pipe 5 with the cut portion 8 facing downwards, so that the cut portion 8 now faces upwards and housing the additional wiring and piping materials into the protective pipe 5. However, this is difficult in practice. That is, since the multiple protective pipes 5 connected by the joint 4 are rotatable relative to each other, it is necessary to reverse each protective pipe 5 individually. When reversing a protective pipe 5, other connected protective pipes 5 tend to move along with it, resulting in poor workability. It is not practical to reverse each protective pipe 5 individually and align its cut portion 8 so that it forms a straight line across its entire length.

[0008] The present invention aims to provide a corrugated pipe that can house wiring and piping materials inside with multiple corrugated pipes connected by a connector, with the cut portions of the corrugated pipes facing upward, and that can be inverted in this connected state. [Means for solving the problem]

[0009] The invention of claim 1, which solves the above problem, A corrugated pipe having alternating axially oriented protrusions and indentations on its outer surface, with the cross-sectional shape of the protrusions being rectangular, and having a continuous axially oriented slit in one of the four planar pipe wall sections, which can be opened to accommodate and lay wiring and piping materials inside; One of the corrugated tubes A connecting portion is integrally provided at one end in the axial direction, which is superimposed by fitting the other end of another corrugated pipe into it. One of the corrugated tubes The aforementioned connection part includes, The main body, excluding the connection part. A cut section is provided and a connecting cut section is formed that is linearly continuous with the connecting cut section and another corrugated pipe. Installed along the entire length The cut portion is aligned with the other end of one corrugated pipe, allowing the other end of one corrugated pipe to be inserted into the connection portion of one corrugated pipe. While twisting and rotating at least two consecutive corrugated pipes, which are connected in a series to each other via the aforementioned connection portion, such that the upward-facing cut portion faces downward, The cut portion of the main body of the one corrugated pipe, and its The cutting portion of the connection part , and the cut portion of the other corrugated pipe established each The opposing end edges are characterized by their ability to deform so as to shift along the axial direction of the corrugated pipe.

[0010] According to the invention of claim 1, It is composed of the aforementioned one corrugated tube and the aforementioned other corrugated tube. While twisting and rotating multiple corrugated pipes so that the upward-facing cut portion faces downward, The cut portion of the main body of the one corrugated pipe, and its The cutting portion of the connection part , and the cut portion of the other corrugated pipe established each Since the opposing end edges can be deformed to shift along the axial direction of the corrugated pipe, the corrugated pipe with the above configuration can be reversed.

[0011]

[0012] [Effects of the Invention]

[0013] According to the invention of claim 1, It consists of one corrugated tube and another corrugated tube. While twisting and rotating multiple corrugated pipes so that the upward-facing cut portion faces downward, The cut portion of the main body of the one corrugated pipe, and its Connection part, cut section , and the cut portion of the other corrugated pipeProvided each Since the opposing edge portions are deformable so as to shift along the axial direction of the corrugated tube, the corrugated tube of the above configuration can be reversely arranged.

Brief Description of the Drawings

[0014] [Figure 1] It is a perspective view showing a part of the state where two corrugated tubes D1 and D2 are connected by a connector C, with a break. [Figure 2] (a) and (b) are perspective views of the corrugated tube D seen from different directions respectively. [Figure 3] (a) to (c) are a side view, a front view, and a central longitudinal sectional view of the corrugated tube D respectively. [Figure 4] (a) and (b) are sectional views taken along the X1 - X1 line and the X2 - X2 line of FIG. 3(b) respectively. [Figure 5] (a) and (b) are perspective views of the states before and after expanding the cut portion 5 of the corrugated tube D to accommodate the wiring and piping material P inside. [Figure 6] (a) and (b) are perspective views of the connector C seen from different directions respectively. [Figure 7] (a) and (b) are a front view and a side view of the connector C respectively, and (c) and (d) are sectional views taken along the Y1 - Y1 line and the Y2 - Y2 line of (a). [Figure 8] (a) and (b) are sectional views taken along the Y3 - Y3 line and the Y4 - Y4 line of FIG. 7(c). [Figure 9] (a) is a perspective view of the state where the entire body is torsionally deformed by twisting the flat base portion 22 of the connector C, and (b) is a schematic perspective view mainly showing the torsional deformation. [Figure 10] It is a perspective view of the separated state of two corrugated tubes D1 and D2 and a connector C connecting the corrugated tubes D1 and D2. [Figure 11] (a) and (b) are a central longitudinal sectional view and a plane sectional view of the connection portion of two corrugated tubes D1 and D2. [Figure 12]This is a cross-sectional view showing the state in which the cut portion 5 of the corrugated pipe D is widened to accommodate the wiring and piping material P inside. [Figure 13] (a) and (b) are cross-sectional views along the lines Z1-Z1 and Z2-Z2 in Figure 11(a). [Figure 14] (a) and (b) are perspective views showing different states when a corrugated pipe D, which is connected in a series via a connector C and has a cut portion 5 facing upward, is sequentially twisted and rotated from one end to the other so that the cut portion 5 faces downward. [Figure 15] This is a cross-sectional perspective view of the connecting body C, showing the state in which the cut portion 5 of the corrugated pipe D shifts axially when the corrugated pipe D is torsionally rotated. [Figure 16] (a) is a partial perspective view of a corrugated tube D' in which a connecting part C' is integrally provided at one end of the main body A in the axial direction, and (b) is a perspective view of the connected state of two corrugated tubes D', D''. [Modes for carrying out the invention]

[0015] The present invention will be described in more detail below with reference to the best embodiment. Reference Example 1

[0016] First, with reference to Figures 1 to 15, the corrugated pipe connection device of Reference Example 1 of the present invention will be described. The corrugated pipe connection device of the present invention consists of a plurality of corrugated pipes D having alternatingly arranged protrusions and recesses on their inner and outer surfaces and a connecting body C that connects the plurality of corrugated pipes D. As shown in Figures 1 and 9, the connecting body C is irremovably inserted in the longitudinal direction into the opposing ends of each corrugated pipe D that are connected in a series, thereby connecting each corrugated pipe D in a series. Both the corrugated pipes D and the connecting body C are formed by resin injection molding, and since the corrugated pipes have continuous protrusions and recesses on their inner and outer surfaces, they are included in the category of corrugated pipes. Regarding the designation of corrugated pipes, the general designation "D" is used when referring to a corrugated pipe in general, and when specifying individual corrugated pipes in a state where a plurality of corrugated pipes are connected in a series via the connecting body C, the designations "D1, D2, D3, ..." are used, which are the general designation "D" with subscripts.

[0017] First, the corrugated pipe D will be described with reference to Figures 2 to 5. The corrugated pipe D has a rectangular (square) cross-section with four sides of equal width, and its inner and outer surfaces are alternately formed with protrusions and recesses. On the outer side, there are alternate outer protrusions 1 and outer recesses 2, and on the inner side, the parts corresponding to the outer protrusions 1 and outer recesses 2 are alternately formed as inner recesses 3 and inner protrusions 4, respectively, so that the whole thing has a flexible rectangular tube shape. The cross-sectional shape of the outer protrusions 1 is as shown in Figure 4, a square with straight sides, and each corner is formed in an arc shape. The corrugated pipe D as a whole is composed of a total of four equal-width planar pipe wall sections 10, and has a hollow interior.

[0018] At both ends of the corrugated pipe D in the longitudinal direction, approximately half the width of the bottom plate portion 2a of the outer recess 2 protrudes as a projection 2a'. On one of the opposing surfaces of the corrugated pipe D, which has a rectangular cross-section, a linear cut portion 5 is formed in the width direction, continuous in the longitudinal direction, and on the other opposing surface, in the width direction, an elastically deformable hinge portion 6 has an expanding U-shaped cross-section, protruding outward from the projection plate portion 4a of the inner convex portion 4 (the bottom plate portion 2a of the outer recess 2), and is formed linearly in the longitudinal direction, continuous with the cut portion 5. A recess 6a is formed in the hinge portion 6, opening inward. The portion of the corrugated pipe D where the cut portion 5 is formed on the outer protrusion 1 is provided with a pair of gently sloping portions 7 that incline gently inward, and the intersection of the pair of gently sloping portions 7 is slightly recessed into the inside of the corrugated pipe D relative to the other portions, and the cut portion 5 is formed at this intersection. The hollow portion inside the corrugated pipe D, which has a rectangular cross-section, is a pipe housing space 13 for housing wiring and piping materials P. The above-described rectangular tubular corrugated pipe D has a two-part connecting structure in which the cut portion 5 is formed longitudinally on the surface opposite to the surface on which the hinge portion 6 is formed, so that in a cross-sectional view the cut portion 5 expands with the hinge portion 6 as a fulcrum, and the corrugated pipe D with the cut portion 5 expanded is structured so that the cut portion 5 closes and naturally adheres to the surface by the elastic restoring force of the hinge portion 6.

[0019] On the other hand, in the corrugated pipe D, in the central part of the width direction of the surface on which the hinge portion 6 is provided, which is opposite the surface on which the cut portion 5 is provided, a hinge placement recess 11 with an isosceles trapezoidal cross-section and wider outer width is continuously formed in the longitudinal direction, and the hinge portion 6, which has an expanding U-shaped cross-section, is positioned in a manner that it fits into the hinge placement recess 11. Therefore, in the outer protrusion 1 (inner recess 3), both ends of the hinge portion 6, which has an expanding U-shaped cross-section, are connected to the protruding plate portion 1a of the outer protrusion 1 (bottom plate portion 3a of the inner recess 3) by a pair of connecting plate portions 12. Note that the connecting plate portions 12 are not present in the outer recess 2.

[0020] In Reference Example 1, when housing wiring and piping materials P inside the corrugated pipe D, as shown in Figure 5(a), the surface with the cut portion 5 is facing upwards, and the portion of the cut portion 5 is expanded on both sides using the hinge portion 6 as a pivot point to form a pipe insertion opening 14 through which the wiring and piping materials P are housed inside the corrugated pipe D. After housing the materials, the pipe insertion opening 14 is closed as shown in Figure 5(b). After the wiring and piping materials P are housed inside the multiple corrugated pipes D connected in a series via the connector C, the multiple corrugated pipes D are sequentially twisted and rotated from one end to the other, using the cut portion 5 formed in the corrugated pipe D, while the multiple corrugated pipes D remain connected in a series. This reverses the multiple corrugated pipes D, bringing the surface with the cut portion 5 into contact with the laying surface G, and the multiple corrugated pipes D connected in a series are then installed on the laying surface G. Therefore, with the wiring and piping materials P housed inside, a pair of planar pipe wall sections 10, separate from the pair of planar pipe wall sections 10 on which the cut sections 5 and hinge sections 6 of the corrugated pipe D are provided, are positioned perpendicular to the laying surface G. In addition to the rectangular cross-section of the corrugated pipe D itself, the alternating arrangement of protrusions and indentations along its entire length in the longitudinal direction results in a structure with high deformation resistance (deformation rigidity) to external forces acting on each surface, especially in the installed state. Thus, even if a large impact load is applied by falling objects during installation, or if it is stepped on by a person, the corrugated pipe D has the advantage of not easily deforming.

[0021] Next, with reference to Figures 6 to 8, the connecting body C that connects the corrugated pipes D will be described. The connecting body C connects the two corrugated pipes D by utilizing the inner recesses 3 closest to the opposing ends of the two corrugated pipes D to be connected. It corresponds to the inner circumferential shape of the corrugated pipes D, and an opening 21 is formed in a specific part along the circumferential direction to allow the passage of wiring / piping material P. The cross section, which has a predetermined length along the arrangement direction Q of the wiring / piping material P, is roughly U-shaped because a part of the circumferential direction of a rectangular cylindrical shape is missing. The width W of the opening 21 is larger than the outer shape or outer diameter of the cross section of the largest wiring / piping material P that can be accommodated in the corrugated pipe D. That is, the connecting body C comprises a plate-shaped base 22 positioned opposite the opening 21 along the circumferential direction, and a pair of similarly plate-shaped arms 23 erected opposite each other at both ends of the base 22 along the circumferential direction. The connection between the base 22 and the pair of arm portions 23 is curved in an arc shape, and the tips of the pair of arm portions 23 are slightly curved inward.

[0022] On the outer surfaces of the pair of arm portions 23, two engaging portions 24 are integrally formed along the circumferential direction, protruding outward at predetermined intervals along the axial direction. These engaging portions 24 engage with the inner recesses 3 closest to the opposing ends of the two corrugated pipes D to be connected. As shown in Figure 12(a), the engaging portions 24 are formed continuously from the tip of the arm portion 23 to both ends along the circumferential direction of the base portion 22 to avoid interference with the hinge portion 6 of the corrugated pipe D. The pair of engaging portions 24 formed on the outer surfaces of each arm portion 23 at predetermined intervals along the axial direction have an L-shaped cross-section, with the outer portion missing while the opposing portion remains, but there is no functional significance in removing the portion. On the inner surface of the base portion 22, a pipe support portion 25 is formed along the circumferential direction to partially support the wiring and piping materials P when they are housed in the pipe housing space 13 of the multiple corrugated pipes D connected via the connector C, by contacting the wiring and piping materials P. The upper surface of the pipe support section 25 is flat to facilitate the support of wiring and piping materials P.

[0023] In this invention, wiring and piping materials P are housed in the pipe housing space 13 of a plurality of corrugated pipes D connected by a connector C, and with the cut portion 5 facing upward, the plurality of corrugated pipes D are connected in a series, and the plurality of corrugated pipes D are sequentially twisted and rotated from one end to the other, thereby repositioning the entire plurality of corrugated pipes D so that the cut portion 5 faces downward. That is, the corrugated pipe D is made capable of twisting and rotating by the presence of the cut portion 5 formed along its entire axial length, and during this twisting and rotating, the opposing end edges 5a, 5b of the cut portion 5 (see Figures 12 and 15) shift in the axial direction, and the entire corrugated pipe D is twisted, making the twisting and rotating possible. The torsional rotation of the corrugated pipe D described above also occurs at the connection point between the two corrugated pipes D connected via the connector C. Therefore, the connector C connecting the two corrugated pipes D is torsionally deformed as a whole in response to the torsional rotation of the corrugated pipes D.

[0024] When the corrugated pipe D is twisted and rotated, the amount of torsional deformation increases as it moves away from the cut portion 5 along the circumferential direction, so the amount of torsional deformation is maximum at the portion of the corrugated pipe D facing the cut portion 5. On the other hand, with respect to the connecting body C that connects the two corrugated pipes D, the pair of arms 23, which are almost integrated with the corrugated pipe D via the engaging portion 24, are almost integrated with the corrugated pipe D when the corrugated pipe D is twisted and rotated, as shown in Figure 9. When axial forces F1 and F2 of the same size and in opposite directions along the axial direction act on the pair of arms 23, they shift in opposite directions along the axial direction, and the portions at both ends of the base 22 of the connecting body C are forcibly shifted in opposite directions along the circumferential direction, causing the base 22 to twist and deform, and thus the entire connecting body C torsionally deforms. Note that Figure 9(b) is illustrated larger than the actual deformation for ease of understanding.

[0025] As shown in Figures 10 to 13, multiple corrugated pipes D1, D2, etc. are connected in a series via a connector C. With the opposing ends of two corrugated pipes D1, D2 to be connected brought close together and the pipe insertion openings 14 formed by widening the cut portions 5, the two engaging portions 24 provided on the connector C are fitted into the inner recesses 3, which are the inner surfaces of the outer protrusions 1 closest to the opposing ends of each corrugated pipe D1, D2, so that the pipe insertion openings 14 of each corrugated pipe D1, D2 match the opening 21 of the connector C. When the pipe insertion openings 14 of the two corrugated pipes D1, D2 are closed, the engaging portions 24 of the connector C enter into the inner recesses 3 of the two corrugated pipes D1, D2, and engage with each other, so that the two corrugated pipes D1, D2 are connected axially inseparably via the connector C. Through a similar operation, multiple corrugated pipes D1, D2, D3, etc., are connected in a series via a connector C. With each of the two corrugated pipes D1 and D2 inseparably connected axially via the connector C, a predetermined gap 31 (see Figure 11(b)) is formed between the opposing end faces of each corrugated pipe D1 and D2.

[0026] Furthermore, a gap is formed between the engaging portion 24 of the connector C and the inner surface recess 3 of the corrugated pipe D into which the engaging portion 24 is inserted, allowing the corrugated pipe D to be twisted and deformed. Moreover, this gap is such that the engaging portion 24, once inserted into the inner surface recess 3, can abut against each other along the axial direction before it detaches from the inner surface recess 3, thereby preventing detachment.

[0027] Furthermore, as shown in Figure 13, when multiple corrugated pipes D connected in a series via the connector C are twisted and rotated, the outer protrusions 1 on each corrugated pipe D1, D2 that engage with the inner recess 3 of the inner surface of the connector C, each engaging portion 24 of the connector C, form one of the four planar pipe wall portions 10. These protrusions function as a contact wall portion 15 that the engaging portion 24 of the connector C abuts against during the twisting and rotating of the corrugated pipes D1, D2, while the outer surface of the engaging portion 24 of the connector C functions as a contact portion 26 that the contact wall portion 15 of the corrugated pipes D1, D2 abuts against. The connector C rotates together with the corrugated pipes D on both sides to which it is connected, thereby transmitting the torsional force of one corrugated pipe D connected via the connector C to the other corrugated pipe D. At the same time, the connector C itself is deformed as a whole, with the base portion 22 being twisted and deformed as described above. Furthermore, when the corrugated pipe D is torsionally rotated, the contact portion that restricts the relative rotation between the corrugated pipe D and the connecting body C may be the outer surface of the arm portion 23, rather than the outer surface of the engaging portion 24 as described above, and it is also possible to have both portions function as contact portions.

[0028] Then, as shown in Figure 12, when the cut portions 5 of each of the multiple corrugated pipes D connected in a series via the connector C are widened to form pipe insertion openings 14, the pipe insertion openings 14 and the opening 21 of the connector C are positioned at the same location along the circumferential direction, so that wiring and piping materials P can be accommodated in the pipe housing space 13 of the corrugated pipes D through the pipe insertion openings 14 and 21. After accommodating the wiring and piping materials P in the pipe housing space 13 of the corrugated pipes D, when the pipe insertion openings 14 of each corrugated pipe D are closed, as shown in Figure 13, each corrugated pipe D is positioned with the wiring and piping materials P inserted into the internal pipe housing space 13 and each cut portion 5 facing upward.

[0029] Next, in order to prevent foreign objects, rainwater, etc. from entering the interior through the cut section 5 of the upward-facing corrugated pipe D, each corrugated pipe D is sequentially reversed by torsional rotation while remaining connected in a series, so that the cut section 5 which was facing upward also faces downward. The length of the corrugated pipe D varies depending on the cross-sectional size, the type of wiring / piping material P to be housed, etc. However, when the corrugated pipe D is torsionally rotated, torsional stress acts on the corrugated pipe D, which may cause the corrugated pipe D to rotate in the opposite direction during the torsional rotation, or cause partial damage to the corrugated pipe. Such partial damage is something that must be avoided at all costs. For this reason, the maximum torsional angle relative to the total length of the corrugated pipe increases as its length increases, but there is a certain limit from the standpoint of preventing the aforementioned damage. It has been demonstrated that a corrugated pipe D with a length of 4m will not break if the maximum torsional angle, i.e., the maximum difference in the torsional angle between the two ends in the axial direction during torsional rotation, is approximately 90°. Figure 14 illustrates the pipe at this maximum torsional angle. Note that in Figure 14, the relationship between the cross-sectional size and length is ignored.

[0030] Then, in order to reverse the entire system by sequentially twisting and rotating multiple corrugated pipes D connected in a series via a connector C from one end to the other, as shown in Figure 14, when the corrugated pipes D are sequentially twisted so that the maximum twist angle of one pipe D is 90°, when the twist angles of the corrugated pipes D2, D3, D4... reach near their maximum, two or three corrugated pipes D2, D3, D4... are twisted simultaneously, and the connector C connecting two corrugated pipes D2, D3 (D3, D4) in the process of twisting and rotating comes into contact with the pair of contact walls 15 of the two consecutive corrugated pipes D2, D3 (D3, D4) and the pair of contact parts 26 of the connector C, with the rear ones coming into contact with each other along the direction of twisting and rotation, causing the connector C itself to twist and deform. This allows the torsional rotation of one of the two connected corrugated pipes D2, D3 (D3, D4) to be transmitted to the other, enabling both connected corrugated pipes D2, D3 (D3, D4) to deform torsion simultaneously. In the illustrated example, each corrugated pipe D3, D4 is twisted counterclockwise when viewed from the right end.

[0031] As described above, as shown in Figure 15, during torsional rotation, the corrugated pipe D is enabled to torsion by the relative axial displacement of the opposing end edges 5a and 5b of the cut portion 5. The "amount of displacement" is maximum when the torsional angle is 45°, and thereafter it shifts in the opposite direction until the cut portion 5 faces downward, at which point the "amount of displacement" becomes zero and the opposing end edges 5a and 5b return to their original positions. Furthermore, the corrugated pipe D is torsionally rotated while the relative positions of its cut portion 5 and the opening 21 of the connector C remain aligned, and the connector C rotates in accordance with the torsional rotation of the corrugated pipe D.

[0032] In Reference Example 1, each corrugated pipe D connected via the connector C is engaged with only one engaging portion 24 provided at each connection point of the connector C. However, by providing four or six engaging portions 24 on the connector C, it is possible to increase the connection force between the two corrugated pipes D by having two or three engaging portions 24 engage with each connected corrugated pipe D.

[0033] Furthermore, when the corrugated pipe D is torsion-rotated, the pipe support portion 25 provided on the connector C prevents its own opening 21 from being narrowed by torsional deformation, thereby preventing the connector C from being significantly torsion-deformed and unable to follow the torsional rotation of the corrugated pipe D. By forming the connector C from a highly rigid material, the torsional deformation of the connector C during the torsional rotation of the corrugated pipe D can be restricted or minimized as much as possible. If the connector C can follow the torsional rotation of the corrugated pipe D, the pipe support portion 25 is not necessary, and if it is absent, torsional deformation of the connector C becomes easier.

[0034] Furthermore, by providing an insertion ridge on the circumferential central portion of the back surface of the base 22 of the connector C, which fits into the recess 6a of the hinge portion 6 of the corrugated pipe D, in the axial direction of the corrugated pipe D (by providing an insertion ridge on the back surface of the base 22 of the connector C so as to be perpendicular to the pipe support portion 25 on the surface), when connecting two corrugated pipes D via the connector C, the insertion ridge is inserted into the recesses 6a arranged continuously at each end of the two corrugated pipes D, thereby increasing the unity between the two corrugated pipes D and the connector C during the twisting rotation of multiple corrugated pipes D connected in a series via the connector C, making it easier to operate the twisting rotation of the corrugated pipes D. [Examples]

[0035] Next, with reference to Figure 16, the corrugated pipe connecting device of Embodiment 1 of the present invention will be described. In Reference Example 1, a connecting body C, which is separate from the corrugated pipe D, is used to connect the corrugated pipes D to each other. However, in Embodiment 1, a corrugated pipe D' is used in which a connecting part C' is integrally provided at one end in the axial direction. On the other hand A connecting portion C' integrally provided at one axial end of corrugated pipe D' is connected to another corrugated pipe D” Main body without connection part C' A’ By inserting the end of the corrugated tube D', D” It is a structure that connects two parts together. Therefore, the outer shape of the connecting part C' is a similar rectangular shape that is slightly larger than the rectangular outer shape of the main body A. Another corrugated tube D” main body A’ Outer surface protrusion 1’ Multiple external parts that can be fitted and engaged surface The protrusion 41 is located outside the main body A. surface Formed at the same pitch as the protrusion 1, adjacent outer surface Between the protrusions 41, surface A recess 42 is formed, and a connecting cut portion 45 is formed in the portion of the connecting portion C' that corresponds to the cut portion 5 of the main body A, and is continuous with the cut portion 5. Also, in Figure 16, 43 is the outer part of the connecting portion C' of the corrugated pipe D'. surface This shows the inner surface recess of the convex portion 41, which is connected to one another. another Corrugated pipe D” main body A’ Outer surface protrusion 1’ teeth, The aforementioned The corrugated pipe D' is fitted into the inner recess 43 of the connecting part C' with an engaging structure, so that the two corrugated pipes D' D” They are connected inseparably along the axial direction.

[0036] Furthermore, when housing wiring and piping materials P inside the corrugated pipe D', the continuous cut portions 5 and 45 of the main body A and connecting portion C' of the corrugated pipe D' are widened to form a pipe insertion opening continuous with the main body A and connecting portion C', and the wiring and piping materials P are housed inside through this pipe insertion opening, and in the same manner as in Reference Example 1, a series of corrugated pipes D' are connected in a line with wiring and piping materials P housed inside. D” From one end to the other, the cutting portion 5, 45 is sequentially reversed by twisting and rotating at predetermined lengths. 5’ The corrugated tube D' is rearranged so that it faces downwards. D” During torsional rotation, On the other hand, the corrugated tube D' The opposing edge portions 5a, 5b of the cut portion 5 of the main body A and the opposing edge portions 45a, 45b of the cut portion 45 of the connecting portion C', and Each opposing end edge of the cut portion 5' of another corrugated pipe D'' However, as mentioned above, in all cases, the axial displacement enables torsional rotation.

[0037] Each of the corrugated pipes D and D' in Reference Example 1 and Example 1 has a rectangular cross-sectional shape and a total of four planar pipe wall sections. They are corrugated with alternating protrusions and recesses, and have high deformation resistance to external forces acting perpendicular to the direction of formation of the protrusions and recesses. Therefore, even if the cut sections 5 and 45 are positioned facing upward or downward, the corrugated pipe will not be deformed even if it is stepped on by a worker or the like, due to the large deformation rigidity of the pair of planar pipe wall sections that are positioned perpendicular to the laying surface G and facing each other.

[0038] In Reference Example 1 and Example 1, each corrugated pipe D and D' has a square cross-section and a structure having a total of four planar pipe wall sections 10 of equal width. However, since the corrugated pipe of the present invention needs to be able to be stably positioned on the laying surface when wiring and piping materials are housed and in the final laying state, it is sufficient that two surfaces, the surface with the cut section and the other surface opposite that surface, are planar pipe wall sections. The remaining pair of surfaces do not necessarily need to be planar pipe wall sections, and may, for example, be formed as outwardly bulging arc-shaped pipe wall sections. Furthermore, the cross-section of the outer recess may be circular. [Explanation of symbols]

[0039] A ,A’ :Main body of corrugated pipe C: Connector C': Connection point of corrugated pipe D,D' ,D” :Corrugated tube P: Wiring and piping materials 1, 1’, 41: Outer convex part 2,42: Outer surface recess 3,43: Inner surface recess 5, 5’ :Cut part 5a, 5b: Opposite edges of the cut section 10: Planar tube wall part 15: Contact wall portion of corrugated pipe 21: Opening of the connector 22: Base of the connector 23: Arm part of the connecting body 24: Engaging part of the connector 26: Contact portion of the connector 45: Connection cut section 45a, 45b: Opposite edges of the cut section

Claims

[Claim 1] A corrugated pipe having alternating axially oriented protrusions and indentations on its outer surface, with the cross-sectional shape of the protrusions being rectangular, and having a continuous axially oriented slit in one of the four planar pipe wall sections, which can be expanded to accommodate and lay wiring and piping materials inside. One end of the corrugated pipe is integrally provided with a connecting portion that overlaps with the other end of another corrugated pipe by fitting it inside. The connecting portion of one corrugated pipe has a connecting portion cut section that is linearly continuous with a cut section provided on the main body portion excluding the connecting portion, and by aligning this connecting portion cut section with a cut section provided along the entire length of the other corrugated pipe, the other end of the other corrugated pipe can be inserted into the connecting portion of one corrugated pipe. A corrugated pipe characterized in that, while twisting and rotating at least two consecutive corrugated pipes, which are connected in a series to each other via the aforementioned connecting portion, so that the upward-facing cut portion faces downward, the cut portion of the main body of one of the corrugated pipes, the connecting portion cut portion of the connecting portion thereof, and the opposing end edges provided on the cut portion of the other corrugated pipe are deformable so as to shift along the axial direction of the corrugated pipe.

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