Pipe connectors and connection methods

Abstract

To provide a pipe material connector and the like capable of allowing a worker to confirm a fastening state of a lock body 11 and having a constitution as a sign of completion of fastening to the worker.SOLUTION: A pipe material connector 10 includes a lock body 11 and a mouth body 21. The lock body 11 includes: an outer cylindrical portion 12 engaged with an outer peripheral face side of a corrugated pipe material 5; an outer flange portion 13 formed at a tip side of the outer cylindrical portion 12; a first engagement portion 14 engaged with spiral unevenness at the outer peripheral face side of the corrugated pipe material 5; a first packing portion 15 attached to the outer flange portion 13; and a crush packing portion 16 connected to the first packing portion 16. The crush packing portion 16 is crushed by a fastening pressure in fastening the lock body 11 engaged with the outer peripheral face of the corrugated pipe material 5 in a direction of a structure 1. A worker can confirm a fastening state of the lock body 11 on the basis of that a thickness of the crush packing portion 16 is thinned or the crush packing portion 16 cannot be visually confirmed.SELECTED DRAWING: Figure 5

Description

【Technical Field】 【0001】 The present invention relates to a pipe connector for connecting and fixing a corrugated pipe material to a through hole formed in a structure such as a handhole or an underground beam. 【Background Art】 【0002】 As a pipe material that can be buried underground by inserting various cables such as communication cables and power supply cables, a corrugated rigid synthetic resin pipe (hereinafter also referred to as a corrugated pipe material or an FEP pipe (Flexible Electric Pipe)) is used. 【0003】 As shown in FIG. 10, for example, a plurality of through holes 2 are provided in a portion of the handhole 1 buried underground in order to insert a corrugated pipe material. Conventionally, a pipe connector for connecting and fixing a corrugated pipe material to the wall around the through hole 2 of the handhole 1 is known (see, for example, Patent Document 1). 【0004】 In the pipe connector of Patent Document 1, a tightening member 101 as shown in FIG. 11(b) is screwed onto the outer peripheral surface of a spiral corrugated pipe material, and the tightening member 101 is pressed against the wall surface around the through hole 2. On the other hand, a bellmouth 102 as shown in FIG. 11(a) is screwed onto the inner peripheral surface of the spiral corrugated pipe material, and the flange portion of the bellmouth 102 is pressed against the wall surface around the through hole 2. Thus, the pipe connector of Patent Document 1 connects and fixes the corrugated pipe material to the through hole 2 by sandwiching the wall around the through hole 2 with the tightening member 101 and the bellmouth 102. 【Prior Art Documents】 【Patent Documents】 【0005】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2001-90884 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0006】 The conventional pipe connectors described above were patented by the present applicant and are in practical use at various work sites. 【0007】 However, the applicant's investigation revealed that in the workplace, there is a problem with conventional pipe connectors in that it is difficult to determine how far the tightening should be completed when the tightening member 101 is rotated to tighten it. 【0008】 If the tightening member 101 is overtightened, there is a risk that the fin portion of the locking body may be damaged. On the other hand, if it is not tightened sufficiently, it may not be able to perform its intended function as a pipe connector, which could result in incomplete watertightness. 【0009】 The present invention has been made in view of the above circumstances, and aims to realize a pipe connector and the like that allows a worker to check the tightening status of the tightening member when connecting and fixing corrugated pipes using the pipe connector, and that has a configuration that signals to the worker that tightening is complete. [Means for solving the problem] 【0010】 The pipe connector of the present invention This pipe connector connects and fixes a corrugated pipe, which has spirally formed irregularities on its inner and outer surfaces, to a through-hole in a structure by using a locking body and a mouth body to clamp the wall surrounding the through-hole. 【0011】 In the present invention, the locking body comprises an outer cylinder portion that screws onto the outer circumferential surface of the corrugated pipe material, an outer flange portion formed on the tip side of the outer cylinder portion, a first engaging portion formed on the inside of the outer cylinder portion that screws onto the helical grooves on the outer circumferential surface of the corrugated pipe material, a first packing portion attached to the outer flange portion, and a crushing packing portion joined to the first packing portion. The mouse body comprises an inner cylinder portion that screws onto the inner circumferential surface of the corrugated pipe material, an inner flange portion formed on the tip side of the inner cylinder portion, a second engaging portion formed on the outside of the inner cylinder portion that screws onto the helical grooves on the inner circumferential surface of the corrugated pipe material, and a second packing portion attached to the inner flange portion. 【0012】 In this invention, the crushed packing portion is crushed by the tightening pressure when the locking body screwed onto the outer surface of the corrugated pipe material is tightened toward the structure, and the thickness of the crushed packing portion becomes thinner, or the crushed packing portion becomes invisible, allowing the worker to confirm the tightening status of the locking body. 【0013】 In the present invention, the crushed packing portion may be configured to have a colored area at a position visible to the worker when it is screwed onto the outer surface of the corrugated pipe material. 【0014】 In this invention, the compressed packing portion is made of open-cell flexible polyurethane foam, and the density of the flexible polyurethane foam is 31±5 kg / m³. 3 A configuration such as the above may be adopted. 【0015】 In the present invention, the crushed packing portion may be configured such that, when the locking body is tightened, the peripheral edge of the crushed packing portion is covered by the peripheral edge of the first packing portion, whose outer diameter has been expanded by the tightening pressure, thereby making the crushed packing portion invisible. 【0016】 The pipe connection method of the present invention is a method of connecting and fixing corrugated pipe material to a through hole using the pipe connector of the present invention, The process involves screwing a mouse body onto the inner circumferential surface of a corrugated pipe, and pressing the second packing portion attached to the inner flange portion of the mouse body against the structure surrounding the through hole, The process involves screwing a locking body onto the outer surface of a corrugated pipe, and pressing the first packing portion and the compressed packing portion attached to the outer flange portion of the locking body against the structure surrounding the through hole, The process involves the compression of the packing portion by the tightening pressure when the locking body is tightened in the direction of the structure, The process involves checking the tightening status of the locking body due to a decrease in the thickness of the compressed packing portion, or because the compressed packing portion is no longer visible. It includes. [Effects of the Invention] 【0017】 In the present invention, the locking body comprises an outer cylinder portion that screws onto the outer circumferential surface of the corrugated pipe, an outer flange portion formed on the tip side of the outer cylinder portion, a first engaging portion formed on the inside of the outer cylinder portion that screws onto the helical grooves on the outer circumferential surface of the corrugated pipe, a first packing portion attached to the outer flange portion, and a crushing packing portion joined to the surface of the first packing portion that clamps the wall around the through hole. On the other hand, the mouse body comprises an inner cylinder portion that screws onto the inner circumferential surface of the corrugated pipe, an inner flange portion formed on the tip side of the inner cylinder portion, a second engaging portion formed on the outside of the inner cylinder portion that screws onto the helical grooves on the inner circumferential surface of the corrugated pipe, and a second packing portion attached to the surface of the inner flange portion that clamps the wall around the through hole. 【0018】 In this invention, the crushed packing portion is crushed by the tightening pressure when the locking body, which is screwed onto the outer surface of the corrugated pipe material, is tightened in the direction of the structure. The shape and material of the crushed packing portion are determined so that the operator can confirm the tightening status of the locking body when the thickness of the crushed packing portion is reduced or the crushed packing portion becomes invisible. 【0019】 In the conventional pipe connection fitting, it was unclear to what extent tightening should be performed to determine that the tightening was completed, and thus it had no choice but to rely on the experience and skills of the operator. Since the present invention includes the crushed packing portion having the above-described configuration, when connecting and fixing the corrugated pipe using the pipe connection fitting, the operator can confirm the tightened state of the lock body. In the present invention, when tightening the lock body, the fact that the thickness of the crushed packing portion has become thinner or the fact that the crushed packing portion has become invisible can serve as a clue for determining that the tightening is completed. 【Brief Description of the Drawings】 【0020】 [Figure 1] Regarding the pipe connection fitting of the embodiment, Fig. 1(a) is a view of the mouse body seen from the front direction, Fig. 1(b) is a view of the mouse body seen from the side, and Fig. 1(c) is a view of the lock body seen from the side. [Figure 2] Regarding the outer cylinder portion and the outer flange portion of the lock body of the embodiment, Fig. 2(a) is a view seen from the side, Fig. 2(b) is a view seen from the front direction, Fig. 2(c) is a perspective view seen from obliquely above the tip side, and Fig. 2(d) is a longitudinal sectional view. [Figure 3] Regarding the inner cylinder portion and the inner flange portion of the mouse body of the embodiment, Fig. 3(a) is a view seen from the side, Fig. 3(b) is a view seen from the front direction, Fig. 3(c) is a perspective view seen from obliquely above the tip side, and Fig. 3(d) is a longitudinal sectional view. [Figure 4] Fig. 4 is a view seen from the side of a state where the lock body is screwed and attached to the outer peripheral surface of the corrugated pipe, the tip portion of the corrugated pipe is inserted into the through hole of the structure, and the mouse body is screwed and attached to the inner peripheral surface of the corrugated pipe. [Figure 5] Fig. 5(a) is a view seen from the side of a state before starting the tightening of the lock body where the crushed packing portion is not crushed, and Fig. 5(b) is a view seen from the side of a state where the tightening of the lock body is completed and the crushed packing portion has been crushed and become invisible. [Figure 6] Fig. 6 is a longitudinal sectional view of the state where the tightening of the outer cylinder portion of the lock body is completed from the state of Fig. 4. [Figure 7]Figures 7(a) to 7(c) illustrate how, when the locking body is tightened, the peripheral edge of the compressed packing portion is covered by the peripheral edge of the first packing portion, whose outer diameter has expanded due to the tightening pressure. [Figure 8] Figures 8(a) to 8(d) illustrate the procedure for a pipe connection structure according to a first modified embodiment, in which a winding locking material is wrapped around a corrugated pipe and installed inside a through-hole. [Figure 9] Regarding the pipe connection structure according to the first modified embodiment, Figure 9(a) shows the injection of caulking material from the mouse body side, and Figure 9(b) is a side view of the state in which the caulking material has been filled between the wrapping locking material and the mouse body. [Figure 10] Figure 10 is a perspective view of a structure such as a handhole with multiple through-holes, seen from an oblique angle above. [Figure 11] Figures 11(a) and 11(b) illustrate the configuration of a conventional pipe connector. [Modes for carrying out the invention] 【0021】 Embodiments of the present invention will be described in detail below with reference to the drawings. Note that the following embodiments are examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses. 【0022】 [overview] The pipe connector 10 of this embodiment connects and fixes a corrugated pipe 5, which has spirally arranged irregularities on its inner and outer surfaces, to a through hole 2 formed in a structure 1, including a portion buried underground such as a handhole, using a locking body 11 and a mouth body 21. In this embodiment, FEP pipe is used for the corrugated pipe 5. The locking body 11 has a cylindrical outer cylinder portion 12, which is screwed onto the outer circumference of the corrugated pipe 5. When a worker rotates the locking body 11 at the work site, the locking body 11 moves in the axial direction of the corrugated pipe 5. The mouth body 21 has a cylindrical inner cylinder portion 22, which is inserted into the corrugated pipe 5 from the tip side. As a result, the mouth body 21 is screwed onto the inner circumference of the corrugated pipe 5, preventing the corrugated pipe 5 from coming out of the pipe. After attaching the mouse body 21 to the tip of the corrugated pipe 5, tightening the locking body 11 toward the mouse body 21 causes the outer flange portion 13 of the locking body 11 and the inner flange portion 23 of the mouse body 21 to clamp the wall around the through hole 2, thereby connecting and fixing the corrugated pipe 5 to the through hole 2. The structure 1 and the corrugated pipe 5 will be described below with reference to Figures 1 to 7, and then the configuration of the locking body 11 and mouse body 21 that constitute the pipe connector 10 will be described. 【0023】 [Regarding the structure] Structure 1 is a concrete handhole, installed, for example, at a branch point of underground piping. In Figure 4, the left side of the paper shows the interior of the handhole, and the right side shows the exterior. The corrugated pipe material 5 on the outside of Structure 1 is buried underground with soil piled on top. Structure 1 is provided with a straight through-hole 2. The through-hole 2 is formed, for example, by a core drill. 【0024】 [Regarding corrugated tubing] In this embodiment, a flexible FEP pipe is used as the corrugated pipe material 5. The outer diameter of the corrugated pipe material 5 is smaller than the inner diameter of the through hole 2. Regular spiral irregularities are formed on both the outer and inner surfaces of the corrugated pipe material 5. Specifically, as shown in Figures 4 and 6, the outer surface of the corrugated pipe material 5 has outer spiral irregularities 6a, and the inner surface of the corrugated pipe material 5 has inner spiral irregularities 6b, both formed in a spiral pattern. 【0025】 The corrugated pipe material 5 is made of a soft or hard resin with appropriate flexibility, and various materials such as polyethylene, polycarbonate, ABS, and polypropylene can be used. Various types of cables are inserted inside the corrugated pipe material 5. For example, communication cables that carry optical or electrical signals, and power supply cables that transmit electricity. 【0026】 [Composition of the lock body] As shown in Figure 1(c), the locking body 11 comprises an outer cylinder portion 12, an outer flange portion 13, a first packing portion 15, a crushed packing portion 16, and a fin portion 17. The outer cylinder portion 12, the outer flange portion 13, and the fin portion 17 are formed from a hard material such as resin, specifically from a hard material that hardly bends, such as hard polyethylene, polycarbonate, ABS, or polypropylene. As shown in Figure 2(b), the outer cylinder portion 12 has an opening 12a in the center. The outer cylinder portion 12 is a cylindrical member whose inner diameter is slightly larger than the outer diameter of the corrugated pipe material 5. 【0027】 The outer flange portion 13 is a disc-shaped member that extends outward from the entire circumference of the tip of the outer cylinder portion 12 (the left end in Figure 2(d)). An annular first packing portion 15 is attached to the tip surface of the outer flange portion 13 by adhesive or the like. 【0028】 In this embodiment, in Figure 1(c), the ratio of the thickness of the first packing portion 15 indicated by the symbol e to the thickness of the crushed packing portion 16 indicated by the symbol f is 5:1. 【0029】 The first packing portion 15 is a cushioning and flexible material, made of, for example, urethane, with closed-cell internal air bubbles. In this embodiment, urethane foam with the following physical properties is used. The first packing portion 15 has the function of preventing water penetration. Specifically, the first packing portion 15, together with the outer flange portion 13 and the crushed packing portion 16, seals the surface of the structure 1 around the through hole 2, preventing water from penetrating between it and the structure 1. <Physical properties of the first packing part 15> Density 85±15 kg / m 3 Compression hardness (25%) 19.6±10 N Compression hardness (50%) 39.2±10 N Tensile strength 196 kPa or less Growth 250% or less Tear strength 7.8 or less N / cm Compression residual strain (50% compression) 5 or higher Deflection rate: 80% Breathability: 2.0 cc / cm 2 / sec 【0030】 The crushed packing portion 16 is a component that allows the worker to confirm the tightening status of the locking body 11 by being crushed by the tightening pressure when the locking body 11, which is screwed onto the outer surface of the corrugated pipe material 5, is tightened toward the structure 1, thereby reducing the thickness of the crushed packing portion 16 or making it invisible. Before tightening the locking body 11, the crushed packing portion 16 has a thickness of about 1 / 5 of the first packing portion 15, but when the locking body 11 is tightened and the crushed packing portion 16 is sandwiched between the outer flange portion 13 and the wall surrounding the through hole 2 of the structure 1, its thickness is reduced to, for example, 1 to 2 mm or less. 【0031】 The compressed packing portion 16 is joined to one side of the first packing portion 15 (the side opposite to the side bonded to the outer flange portion 12) by adhesive. In this embodiment, a soft urethane foam with the following physical properties is used. The compressed packing portion 16 has different physical properties from the first packing portion 15 described above, and deforms more easily than the first packing portion 15 when pressure is applied. The air bubbles in the soft urethane foam of the compressed packing portion 16 are continuous cells that are connected to each other. <Physical properties of the compressed packing portion 16> Density 31±5 kg / m 3 Number of cells: 35±10 cells / 25mm Tensile strength 98 kPa or higher (1.0 kg / cm² or higher) 2 ) Growth of 100% or more Tear strength 4.90 or more N / cm (0.5 or more kg / cm) 【0032】 As described above, the compressed packing portion 16 of this embodiment is made of open-cell flexible polyurethane foam, and the flexible polyurethane foam has a density of 26 kg / m³. 3 The above is 36 kg / m 3 It falls within the following range. 【0033】 The crushed packing portion 16 has a colored area at a position visible to the worker when it is screwed onto the outer surface of the corrugated pipe material 5. The position visible to the worker is, for example, the side surface of the crushed packing portion 16. The colored area may be the entire crushed packing portion 16 (including the top surface, bottom surface, and side surface), the entire circumference of the side surface, or a part of the side surface. Furthermore, it is preferable that the colored area of ​​the crushed packing portion 16 be a color that is easily visible at the work site. An easily visible color is, for example, yellow, but any color such as red, blue, or green is also acceptable. Note that the color of the colored area of ​​the crushed packing portion 16 is different from the color of the adjacent first packing portion 15. 【0034】 To screw the outer cylinder portion 12 onto the outer circumference of the corrugated pipe material 5, a first engaging portion 14 is provided on the inner surface of the outer cylinder portion 12 (see Figure 6). As shown in Figure 2(b), in this embodiment, a pair of first engaging portions 14 protrude toward the center at positions facing each other on the inner circumferential surface of the outer cylinder portion 12. Therefore, the locking body 11 is stably screwed onto the corrugated pipe material 5. 【0035】 Multiple fin portions 17 extending in the longitudinal direction are formed around the locking body 11 at regular intervals. The tip of each fin portion 17 is connected to the outer flange portion 12. In this way, the fin portions 17 increase the strength of the locking body 11. The fin portions 17 also function as an anti-slip surface when the operator rotates the locking body 11. 【0036】 [Structure of the mouse body] As shown in Figure 1(b), the mouse body 21 comprises an inner cylinder portion 22, an inner flange portion 23, and a second packing portion 24. The inner cylinder portion 22 and the inner flange portion 23 are formed from a hard or slightly flexible material such as resin, specifically from a hard or slightly flexible material such as polyethylene, polycarbonate, ABS, or polypropylene. As shown in Figure 3(b), the inner cylinder portion 22 has an opening 22a in the center. The inner cylinder portion 22 is a cylindrical member whose outer diameter is slightly smaller than the inner diameter of the corrugated pipe material 5. As shown in Figure 4, the inner cylinder portion 22 is inserted into the corrugated pipe material 5 from the tip side and screwed onto the inner circumferential surface of the tip of the corrugated pipe material 5. 【0037】 The inner flange portion 23 is a disc-shaped member that extends outward from the entire circumference of the tip of the inner cylinder portion 22 (the left end in Figure 3(d)). An annular second packing portion 25 is joined to the surface of the inner flange portion 23 opposite to the tip surface by adhesive or the like. 【0038】 The second packing portion 25 is a cushioning and flexible material, made of, for example, urethane, with closed-cell internal air bubbles. In this embodiment, urethane foam with the same physical properties as the first packing portion 15 described above is used. The second packing portion 25 has the function of preventing water penetration. Specifically, the second packing portion 25, together with the inner flange portion 23, seals the surface of the structure 1 around the through hole 2, preventing water from penetrating between the second packing portion 25 and the structure 1. 【0039】 A second engaging portion 24 is provided on the outer surface of the inner cylinder portion 22 in order to screw the inner cylinder portion 22 onto the inner circumferential surface of the corrugated pipe material 5 (see Figure 6). As shown in Figure 3(a), in this embodiment, a continuous spiral second engaging portion 24 is provided protruding from the inner circumferential surface of the inner cylinder portion 22. The mouse body 21 is inserted from the tip side of the corrugated pipe material 5 (opposite the tightening direction of the lock body 11) and screwed into the inside of the corrugated pipe material 5. 【0040】 A flexible water-sealing material 29 is filled between the second packing portion 25 and the inner flange portion 23. The shape of the second packing portion 25 is annular, more specifically, circular. The second packing portion 25 is flexible and prevents water from penetrating between the inner flange portion 23 and the structure 1. The water-sealing material 29 is filled inside the second packing portion 25. The water-sealing material 29 is adhesive and fills along the contours, so no gaps are created. Therefore, the waterproofing and water-sealing properties do not deteriorate over a long period of time, protecting the cables inside the corrugated pipe 5 from water and preventing malfunctions. 【0041】 [Effects of this embodiment, etc.] The effects of the pipe connector 10 of this embodiment will be explained with reference to Figures 4 to 7. The mouth body 21 can rotate while the second engaging portion 24 formed on the outer circumferential surface of the inner cylinder body 22 screws onto the inner circumferential spiral grooves 6b of the corrugated pipe material 5. As shown in Figure 4, the mouth body 21 is inserted into the inside of the tip of the corrugated pipe material 5 from the left. When the mouth body 21 is screwed onto the inner circumferential surface of the corrugated pipe material 5, the second packing portion 25 provided on the inside of the inner flange portion 23 of the mouth body 21 is pressed against the structure 1 surrounding the through hole 2, resulting in a contact state. 【0042】 The locking body 11 can rotate while the first engaging portion 14 formed on the inner circumferential surface of the outer cylinder portion 12 screws onto the outer spiral grooves 6a of the corrugated pipe material 5. When the locking body 11 is screwed onto the outer circumferential surface of the corrugated pipe material 5, the locking body 11 is pressed against the wall surface around the through hole 5. When the locking body 11 is further tightened with the mouth body 21 attached, the distance between the mouth body 21 and the locking body 11 is further reduced, and the structure 1 around the through hole 2 is sandwiched between the first packing portion 15 and the crushed packing portion 16 joined to the outer flange portion 12 of the locking body 11 and the second packing portion 25 joined to the inner flange portion 23 of the mouth body 21. 【0043】 Herein lies a problem in the work site: it is difficult to determine how much tightening from the locking body 11 side is necessary to determine that tightening is complete. To address this problem, in the pipe connector 10 of this embodiment, as shown in Figure 5(a), a 5mm thick crushed packing part 16, which is painted yellow, is bonded and attached between the first packing part 15 and the structure 1. In this embodiment, the entire crushed packing part 16 is yellow. 【0044】 As the operator tightens the first packing portion 15 and the crushed packing portion 16 to the locking body 11 by the optimal amount, their respective shapes gradually change, as shown in Figures 7(a) to 7(c). 【0045】 In this embodiment, first, when tightening the locking body 11 is initiated, the diameter of the compressed packing portion 16 is made slightly shorter than the diameter of the first packing portion 15, as shown in Figure 7(a). Therefore, the peripheral edge 16a of the compressed packing portion is located closer to the center of the compressed packing portion 16 than the peripheral edge 15b of the first packing portion 15. 【0046】 Next, as the locking body 11 is tightened to a certain extent, as shown in Figure 7(b), the thickness of the first packing portion 15 is compressed to about half, and the thickness of the crushed packing portion 16 is compressed to about 1 to 2 mm. The end of the first packing portion 15 begins to curve outward. Also, the position of the peripheral edge 16a of the crushed packing portion becomes approximately the same as the position of the peripheral edge 15b of the first packing portion 15. 【0047】 Next, when the tightening amount of the locking body 11 reaches the most appropriate stage, as shown in Figure 7(c), the thickness of the first packing portion 15 is compressed to about 1 / 5 of its original thickness, and the thickness of the crushed packing portion 16 is compressed to an extremely thin 1 mm or less. The end of the first packing portion 15 continues to curve outward. Then, the peripheral edge 16a of the crushed packing portion 16 is covered by the peripheral edge 15a of the first packing portion 15, whose outer diameter has been slightly expanded by the tightening pressure. 【0048】 In this embodiment, the shape and material of the first packing portion 15 and the crushed packing portion 16 are determined such that the changes described above generally appear in the first packing portion 15 and the crushed packing portion 16 while the locking body 11 is being tightened. As a result, to the operator, the yellow line on the side of the crushed packing portion 16, which was present before the tightening was completed, gradually becomes thinner and eventually disappears. 【0049】 In other words, in this embodiment, when the locking body 11 is tightened, the peripheral edge 16a of the crushed packing portion 16 is covered by the peripheral edge 15a of the first packing portion 15, whose outer diameter is expanded by the tightening pressure, so that the crushed packing portion 16 becomes invisible. The shape and material of the crushed packing portion 16 and the first packing portion 15 are determined in this way. According to this embodiment, not only is the thickness of the crushed packing portion 16 reduced, but by configuring it so that it becomes completely invisible, it is possible to more clearly indicate to the worker that tightening is complete. 【0050】 This allows the worker to properly tighten the lock body 11 by using the disappearance of the yellow line on the compressed packing portion 16 as an indicator. Figures 5(b) and 6 show the state where the yellow line on the compressed packing portion 16 is no longer visible, indicating that the lock body 11 has been tightened to a satisfactory degree. The thickness of the first packing portion 15 of the lock body 11 and the second packing portion 25 of the mouse body 21 is compressed to about 1 / 5 of its original thickness when tightening is complete. In this state, the first packing portion 15 and the compressed packing portion 16 are tightly adhered to the structure 1 surrounding the through hole 2, further strengthening the watertightness and waterproofing. 【0051】 On the other hand, on the mouse body 21 side, the second packing portion 25 seals the surface of the structure 1 surrounding the through hole 2, preventing water from penetrating between it and the structure 1. Furthermore, since the water-sealing material 29 is filled in the central part of the annular second packing portion 25, the water-sealing and waterproofing properties are made stronger. 【0052】 The embodiment described above includes a pipe connection method in which a corrugated pipe 5 is connected and fixed to a through hole 2 using a pipe connector 10. 【0053】 The pipe connection method of this embodiment is The first step involves screwing the mouth body 12 onto the inner circumferential surface of the corrugated pipe material 5, and pressing the second packing portion 25 attached to the inner flange portion 23 of the mouth body 12 against the structure 1 surrounding the through hole 2, The second step involves screwing the locking body 11 onto the outer surface of the corrugated pipe material 5, and pressing the first packing portion 15 and the compressed packing portion 16 attached to the outer flange portion 13 of the locking body 11 against the structure 1 surrounding the through hole 2, In the third step, the crushed packing portion 16 is crushed by the tightening pressure when the locking body 1 is further tightened in the direction of the structure 1, The fourth step involves checking the tightening state of the locking body 11 because the thickness of the compressed packing portion 16 has decreased, or the compressed packing portion 16 is no longer visible. It includes. 【0054】 The third step described above may be a step in which the compressed packing portion 16 is crushed by the tightening pressure when the locking body 1 is tightened in the direction of the structure 1, and the peripheral edge 16a of the compressed packing portion 16 is covered by the peripheral edge 15a of the first packing portion 15, whose outer diameter has been expanded by the tightening pressure, so that the compressed packing portion 16 is no longer visible. In that case, the fourth step described above may be a step in which the tightening of the locking body 11 is completed, using the fact that the thickness of the compressed packing portion 16 is no longer visible as a sign. 【0055】 [Other effects] The pipe connector 10 basically works by tightening the locking body 11 attached to the outer surface of the corrugated pipe 5, which shortens the distance between the locking body 11 and the mouth body 21, and the structure 1 surrounding the through hole 2 is clamped, thereby completing the connection and fixing of the corrugated pipe 5. However, if the scope of application of the pipe connector 10 of this embodiment is extended to underground beams, there may be requests at the construction site of the structure 1 to further tighten from the mouth body 21 side even after the locking body 11 has been tightened. 【0056】 Therefore, in the pipe connector 10 of this embodiment, in order to enable tightening from the mouth body 21 side, as shown in Figures 1(a) and 3(b), the inner flange portion 23 of the mouth body 21 is provided with an engaging portion 26 on the side opposite to the side to which the second packing portion 25 is attached, which can be engaged with a tightening jig. 【0057】 The engaging portion 26 can be constructed by providing notches at both ends of the diameter of the inner flange portion 23, as shown in Figure 3(c). By engaging the tip of a screwdriver into the two notches of the engaging portion 26 and rotating each screwdriver clockwise, tightening can be performed from the mouse body 21 side. The screwdriver is equivalent to a tightening jig. 【0058】 Furthermore, the area surrounding the engaging portion 26 formed by the notch is a raised portion 27 with increased thickness. Because the area around the engaging portion 26 is thicker than the rest of the inner flange portion 23 due to the raised portion 27, it becomes easier for the operator to engage the tip of the screwdriver, and the risk of the engaging portion 26 being damaged is also reduced. 【0059】 [Modified Example of Embodiment 1] Next, with reference to Figures 8 to 9, a pipe connection structure according to the first modified example of this embodiment will be described. For example, if the structure 1 is an underground beam, the beam is thick and the length of the through-hole 2 is long, so it is not economical to completely fill the internal space of the through-hole 2 with caulking material, and the work time is also long. Therefore, a pipe connection structure is required that can efficiently fill with caulking material in a short time. 【0060】 The pipe connection structure of this modified example uses the pipe connector 10 described above, a wrap-around locking material 41 having a required length that can be wrapped around and locked to the outer surface of the corrugated pipe 5, and a caulking material 43 to connect and fix the corrugated pipe 5 to the through hole 2 formed in the structure 1. In this modified example, a soft urethane foam material is used as the wrap-around locking material. 【0061】 In this modified example, as shown in Figure 8(a), the locking body 11 is screwed onto the outer surface near the tip of the corrugated pipe 5, and as shown in Figure 8(b), the mouth body 21 is screwed onto the tip of the corrugated pipe 5. The steps up to this point are the same as in the embodiment described above, but in this modified example, in the next step, as shown in Figure 8(c), the wrapping locking material 41 is wrapped around the outer surface of the corrugated pipe 5 near the mouth body 21 and locked in place. Here, the method for locking and fixing the wrapping locking material 41 to the required position on the corrugated pipe 5 is simply to wrap it around, or it may be tied if necessary. 【0062】 In this modified example, when the tightening process from the locking body 11 side is completed, as shown in Figure 8(d), the wrapping locking material 41 is fixed in a state where it is wrapped around the outer surface of the corrugated pipe material 5 at the required position inside the through hole 2. Therefore, the wrapping locking material 41 can act as a wall (bank) inside the through hole 2. Then, in the next step, as shown in Figure 9(a), the worker injects the caulking material 43 from the side of the mouse body 21 using the injection tool 42. 【0063】 Furthermore, as shown in Figure 3(b), two small circular injection port areas 28 are marked on the inner flange portion 23 of the mouse body 21 around the outside of the opening 22a. The worker pre-opens the injection port using a drill, using the pre-opened injection port areas 28 as a guide. Figure 9(a) shows the state in which the injection port has already been opened. 【0064】 By performing the above steps, the caulking material 43 can be filled so as to fill only the space between the wrapping locking material 41 and the mouse body 21. As a result, in the pipe connection structure of this modified example, the caulking material 43 can be efficiently filled in a short amount of time. 【0065】 [Other variations] In the above-described embodiment, the outer flange portion 13 and the inner flange portion 23 do not need to be integrally formed with respect to the outer cylinder portion 12 and the inner cylinder portion 22, and may be detachably configured. For example, the outer flange portion 13 and the inner flange portion 23 may be screwed into the outer cylinder portion 12 and the inner cylinder portion 22. 【0066】 In the above-described embodiment, a spirally continuous first engagement portion 14 may be formed on the inner circumferential surface of the outer cylinder portion 12 of the locking body 11. Alternatively, three or more first engagement portions 14 may be formed on the inner circumferential surface of the outer cylinder portion 12. 【0067】 In the above-described embodiment, the outer flange portion 13 and the inner flange portion 23 may have a partially cut-out shape, or any shape such as an ellipse or polygon. Furthermore, they may extend diagonally rather than perpendicularly to the outer cylinder portion 11 and the inner cylinder portion 22. [Industrial applicability] 【0068】 The pipe connector of the present invention is applicable not only to through-holes in handholes but also to through-holes in underground beams. [Explanation of symbols] 【0069】 1 structure 2 through holes 5 Corrugated pipe material (FEP pipe) 6a Outer circumference spiral unevenness 6b Inner Circumferential Helical Concave and Convex 10 Pipe fittings 11 Lock Body 12 Outer cylinder 13 Outer flange section 14 First engagement part 15. First packing section 16 Compression packing section 17 Fin section 21 Mouse body 22 Inner cylinder 23 Inner flange section 24 Second engagement part 25. Second packing section 26 Notch (engaging portion) 27 Ridge 28. Area to be injected 29 Waterproofing material 41 Wrap-around locking material 42 Injection tool 43. Caulking material

Claims

[Claim 1] A pipe connector for connecting and fixing a corrugated pipe material, in which irregularities are formed in a spiral pattern on the inner and outer surfaces, to a through-hole in a structure by using a locking body and a mouth body to clamp the wall surrounding the through-hole, The locking body comprises an outer cylinder portion that screws onto the outer circumferential surface of the corrugated pipe material, an outer flange portion formed on the tip side of the outer cylinder portion, a first engaging portion formed on the inside of the outer cylinder portion that screws onto the helical grooves on the outer circumferential surface of the corrugated pipe material, a first packing portion attached to the outer flange portion, and a crushed packing portion joined to the first packing portion. The mouse body comprises an inner cylinder portion that screws into the inner circumferential surface of the corrugated pipe material, an inner flange portion formed on the tip side of the inner cylinder portion, a second engaging portion formed on the outside of the inner cylinder portion that screws into the helical grooves on the inner circumferential surface of the corrugated pipe material, and a second packing portion attached to the inner flange portion. The crushed packing portion is crushed by the tightening pressure when the locking body, which is screwed onto the outer surface of the corrugated pipe material, is tightened in the direction of the structure, and the peripheral edge of the crushed packing portion is covered by the peripheral edge of the first packing portion, whose outer diameter has been expanded by the tightening pressure, so that the crushed packing portion is not visible. [Claim 2] The pipe connector according to claim 1, wherein the crushed packing portion has a colored area at least in a position visible to the worker when screwed onto the outer surface of the corrugated pipe. [Claim 3] The compressed packing portion is made of open-cell flexible polyurethane foam, and the flexible polyurethane foam has a density of 26 kg / m³. 3 The above is 36 kg / m 3 A pipe connector according to claim 1 or 2, wherein the following range is observed. [Claim 4] A method for connecting and fixing corrugated pipe material to the through hole using the pipe connector described in Claim 1 or 2, The steps include: screwing the mouse body onto the inner circumferential surface of the corrugated pipe material, and pressing the second packing portion attached to the inner flange portion of the mouse body against the structure surrounding the through hole, The steps include: screwing the locking body onto the outer surface of the corrugated pipe material, and pressing the first packing portion and the compressed packing portion attached to the outer flange portion of the locking body against the structure surrounding the through hole; The process involves the compression packing portion being crushed by the tightening pressure when the locking body is tightened in the direction of the structure, The process involves confirming the tightening state of the locking body, as the periphery of the compressed packing portion becomes covered by the periphery of the first packing portion, whose outer diameter has been expanded by the tightening pressure, and the compressed packing portion is no longer visible. A method for connecting pipe materials, including the connection method.

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