Pipe connection structure for underground beam sleeves

Abstract

To provide a pipe material connector and the like capable of properly connecting a corrugated pipe material to a through hole of an underground beam without using a coupling joint for connection of different pipes.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; and a first packing portion 15 attached to the outer flange portion 13. The mouth body 21 includes: an inner cylindrical portion 22 engaged with an inner peripheral face side of the corrugated pipe material 5; an inner flange portion 23 formed at a tip side of the inner cylindrical portion 22; a second engagement portion 24 engaged with the spiral unevenness at the inner peripheral face side of the corrugated pipe material; and a second packing portion 25 attached to the inner flange portion 23. In the pipe material connector 10, both of a thickness of the first packing portion 15 and a thickness of the second packing portion 25 are 25 mm or more.SELECTED DRAWING: Figure 1

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 ground beam, and a pipe connection structure using this connector. 【Background Art】 【0002】 A ground beam is a reinforced concrete beam made underground by connecting between independent footings to support a building. At a construction site, ground beam construction is carried out by inserting steel bars between the footings of a building and solidifying them with concrete. 【0003】 In ground beam construction, a thin layer of concrete is laid between the footings of columns, and after marking the position of the ground beam, the space between columns is connected with steel bars, and a formwork for pouring concrete is fixed and installed with bolts. Here, in ground beam construction, a through hole (hereinafter also referred to as a sleeve) for inserting various cables such as communication cables and power supply cables is secured by inserting pipe materials such as hard polyvinyl chloride pipes (hereinafter referred to as PVC pipes) and gas pipes in a direction intersecting the longitudinal direction of the ground beam before pouring concrete. Then, when the installation of the formwork and the pipe material is completed, concrete is poured between the formworks, and after the concrete hardens, the formwork is removed, and a ground beam 1 with a through hole 2 formed at a required position as shown in FIG. 12 is completed. Note that 3 indicates the steel bars used in the ground beam construction. 【0004】 Conventionally, when connecting and fixing a pipe material to a portion where a through hole 2 is provided in a ground beam 1, a waterproof cast iron pipe 100 as shown in FIG. 13 has been used (for example, see Non-Patent Document 1). Between the inner peripheral surface of the through hole 2 and the outer peripheral surface of the waterproof cast iron pipe 100, yarn (hemp string) is used in combination with a sealing material 101 for attachment. Further, as a pipe material capable of inserting various cables inside and burying them underground, a corrugated hard synthetic resin pipe (hereinafter also referred to as a corrugated pipe material or an FEP pipe (Flexible Electric Pipe)) may be used. For connecting the waterproof cast iron pipe 100 and the corrugated pipe material 5, a dissimilar joint 102 is used. 【0005】 On the other hand, conventionally, for example, in handholes buried underground, there are known pipe connectors that connect and fix corrugated pipe material to the wall surrounding the through-hole of the handhole (see, for example, Patent Document 1). The corrugated pipe material in Patent Document 1 is an independent ring-type FEP pipe, in which a plurality of independent ring-shaped protrusions are regularly formed on the inner and outer surfaces. In Patent Document 1, the wall surrounding the through-hole is clamped by a flange formed at one end of the pipe connector. Then, the FEP pipe is pushed into the receiving port of the connector attached to the other end of the pipe connector. At this time, a locking claw provided on the connector engages with the irregularities on the outer surface of the FEP pipe, and the FEP pipe is attached to the connector. [Prior art documents] [Non-patent literature] 【0006】 [Non-Patent Document 1] "Waterproof cast iron pipe (adjustable type): A waterproof cast iron pipe used for pipe penetrations in buildings, which can be embedded within formwork," [online], Doi Manufacturing Co., Ltd., [Retrieved August 1, 2022], Internet<https: / / www.doi-web.com / product / p496 / > [Patent Documents] 【0007】 [Patent Document 1] Japanese Patent Publication No. 2016-5335 [Overview of the Initiative] [Problems that the invention aims to solve] 【0008】 Conventionally, the waterproof cast iron pipes 100 used in underground beams 1 are connected to corrugated pipe material 5 using dissimilar joints 102, which poses a risk of water leakage from the connection point made by the dissimilar joints 102. In addition, waterproofing the gap between the through-hole 2 and the corrugated pipe material 5 requires skilled techniques, and a very manual, analog construction method has been used. 【0009】 In this regard, conventional pipe connectors used in handholes have the advantage of reducing the risk of water leakage because they allow FEP pipes to be inserted directly into the through-holes of the handholes and do not require the use of dissimilar joints 102. However, when attempting to apply conventional pipe connectors used in handholes to underground beams, the following problems arise. 【0010】 In the case of handholes, the surface of the wall material is processed in the factory, resulting in a smooth surface without irregularities. In contrast, as mentioned above, underground beams are formed on the construction site by workers pouring concrete between wooden frames, so the surface of the beam may not be flat and may have irregularities. Furthermore, even when lath formwork is used, the surface of the lath mesh is uneven, resulting in a rough concrete joint surface. Therefore, in the case of underground beams, it is difficult to ensure proper adhesion and waterproofing between the beam surface and the pipe connectors. 【0011】 Furthermore, in the case of handholes, a core drill is used to create through-holes in the wall material. In this case, the size of the core bit attached to the core drill can be appropriately selected, so the inner diameter of the through-hole can be made as close as possible to the outer diameter of the FEP pipe. In contrast, in the case of underground beams, as mentioned above, sleeves are created by installing pipe materials such as PVC pipes between the wooden forms at the construction site before workers pour concrete. In the case of underground beams, there are few types of pipe materials used at the construction site, so the diameter of the sleeve tends to be unbalanced with the diameter of the FEP pipe, resulting in a diameter that is larger than necessary. Therefore, in the case of underground beams, a standard is needed to optimize the size of the flange portion of the pipe connector. 【0012】 Furthermore, in the case of underground beams, it is rare but possible to backfill the outside first due to the construction process. Therefore, in the case of underground beams, the pipe connectors are required to have a configuration that allows for tightening not only from the side of the member that screws onto the outer surface of the FEP pipe, but also from the side of the member that screws onto the inner surface of the FEP pipe. 【0013】 Furthermore, in the case of handholes, the wall material is thin and the length of the penetration hole is short, so if water leakage occurs after the pipe connector is installed, it is possible to completely fill the entire internal space of the penetration hole with sealant. In contrast, in the case of underground beams, watertightness is often required to a greater extent than in handholes, and sealant is injected as needed, but because the beam is thick and the sleeve is long, it is not economical to completely fill the internal space of the sleeve with sealant, and the work takes a long time. For this reason, in the case of underground beams, a pipe connection structure is required that allows for the efficient and quick embedding of sealant. 【0014】 This invention has been made in view of the above circumstances, and aims to realize a pipe connector and pipe connector structure that can solve the above-mentioned problems by not using dissimilar joints in underground beams, not requiring skilled techniques for waterproofing treatment, and allowing construction to be carried out in a short time. [Means for solving the problem] 【0015】 The pipe connector of the present invention This method involves connecting and fixing a corrugated pipe material, which has spirally arranged irregularities on its inner and outer surfaces, to a through-hole formed in an underground beam by sandwiching the underground beam around the through-hole using a locking body and a mouth body. 【0016】 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, and a first packing portion attached to the outer flange portion. 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 inner flange portion. The thickness of both the first packing portion and the second packing portion is 25 mm or more. 【0017】 In the present invention, the outer flange portion of the lock body and the inner flange portion of the mouse body are When the outer diameter of the corrugated pipe material is X (mm) and the outer diameter of the pipe material used when forming the through hole in the underground beam construction is Y (mm), the radius Z1 (mm) of the outer flange portion and the radius Z2 (mm) of the inner flange portion may both adopt a configuration that satisfies the following formula (1). Z1≧ 1.25×(X / 2+(Y-X))···(1) Z2≧ 1.25×(X / 2+(Y-X))···(1) 【0018】 In the present invention, the inner flange portion of the mouse body may adopt a configuration provided with an engaging portion that can be engaged with a tightening jig on the surface opposite to the surface where the second packing portion is attached. 【0019】 The pipe connection structure of the present invention May adopt a configuration in which a pipe connector having any of the above-described configurations, a winding locking material that can be wound around and locked to the outer peripheral surface of the corrugated pipe material, and a caulking material are used to connect and fix the corrugated pipe material to the through hole formed in the underground beam. 【0020】 In the present invention, the winding locking material is attached in a state of being wound around the outer peripheral surface of the corrugated pipe material at a required position inside the through hole, and the caulking material is filled so as to fill the space between the winding locking material and the mouse body. 【Effect of the Invention】 【0021】 In the present invention, the locking body includes an outer cylinder portion that engages with the outer peripheral surface side of the corrugated pipe, an outer flange portion formed at the distal end side of the outer cylinder portion, a first engaging portion formed inside the outer cylinder portion and engaging with the spiral concavo-convexities on the outer peripheral surface side of the corrugated pipe, and a first packing portion attached to the surface of the outer flange portion on the side that sandwiches the wall around the through-hole. On the other hand, the mouse body includes an inner cylinder portion that engages with the inner peripheral surface side of the corrugated pipe, an inner flange portion formed at the distal end side of the inner cylinder portion, a second engaging portion formed outside the inner cylinder portion and engaging with the spiral concavo-convexities on the inner peripheral surface side of the corrugated pipe, and a second packing portion attached to the surface of the inner flange portion on the side that sandwiches the wall around the through-hole. And the thickness of the first packing portion and the thickness of the second packing portion are both set to 25 mm or more. 【0022】 Conventionally, the pipe connector used in the handhole had a packing thickness of 15 mm or less. In the present invention, since the thickness of the first packing portion and the thickness of the second packing portion are both set to 25 mm or more, the cushioning property and flexibility of the first packing portion and the second packing portion are enhanced. Therefore, even when irregularities are observed on the surface of the ground beam, the first packing portion and the second packing portion deform along the irregularities so that no gap occurs, ensuring sufficient adhesion, waterproofness, and watertightness between the surface of the beam and the pipe connector. 【Brief Description of the Drawings】 【0023】 [Figure 1] Regarding the pipe connector 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 locking body seen from the side. [Figure 2] Regarding the outer cylinder portion and the outer flange portion of the locking 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 diagonally above the distal end 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 diagonally above the distal end side, and FIG. 3(d) is a longitudinal sectional view. [Figure 4] Figure 4 is a side view showing the state after the locking body has been screwed onto the outer surface of the corrugated pipe, the tip of the corrugated pipe has been inserted into the through-hole of the underground beam, and the mouse body has been screwed onto the inner surface of the corrugated pipe. [Figure 5] Figure 5 illustrates the effect of the water-stopping area on the mouse body. [Figure 6] Figure 6 is a longitudinal cross-sectional view showing the state after the outer cylinder portion of the lock body has been tightened, compared to the state shown in Figure 4. [Figure 7] Figure 7 illustrates the method for determining the sizes of the outer flange and inner flange portions used in the pipe connector of this embodiment. [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] Regarding the pipe connection structure of the embodiment, Figure 10(a) is a side view of the state before tightening of the locking body begins, where the compressed packing portion is not yet crushed, and Figure 10(b) is a side view of the state after tightening of the locking body is complete, where the compressed packing portion is crushed and no longer visible. [Figure 11] Figure 11 is a perspective view of a pipe connection structure relating to another modified example, seen from diagonally above. [Figure 12] Figure 12 is a perspective view of a ground beam with a sleeve formed on it, seen from diagonally above. [Figure 13] Figure 13 illustrates a conventional pipe connection structure using waterproof cast iron pipes and dissimilar joints. [Modes for carrying out the invention] 【0024】 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. 【0025】 [overview] The pipe connector 10 of this embodiment connects and fixes a corrugated pipe 5, which has spirally formed irregularities on its inner and outer surfaces, to a through hole 2 formed in an underground beam 1 using a locking body 11 and a mouth body 21. In this embodiment, FEP pipe is used for the corrugated pipe 5. The through hole 2 is generally called a sleeve. The locking body 11 has a cylindrical outer cylinder portion 12, and the outer cylinder portion 12 is screwed onto the outer circumference of the corrugated pipe 5. When a worker rotates the locking body 11 at the underground beam construction 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, and the inner cylinder portion 22 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, and the corrugated pipe 5 is prevented 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 underground beam 1 and the corrugated pipe 5 will be described below with reference to Figures 1 to 6 and Figure 10, and the configuration of the locking body 11 and mouse body 21 that constitute the pipe connector 10 will also be described. 【0026】 [Regarding underground beams] The underground beam 1 is a reinforced concrete beam formed by underground beam construction. In Figure 4, the left side of the page is inside the building, and the right side is outside. The corrugated pipe material 5 on the outside of the underground beam 1 is buried underground by being piled up with soil. The width of the underground beam 1 is, for example, 50 cm to 2 m, but in some buildings it may exceed 2 m. The underground beam 1 is provided with straight through holes 2. The through holes 2 are formed by installing pipe material such as PVC pipes before pouring concrete between the wooden frames during underground beam construction. 【0027】 [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. 【0028】 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. 【0029】 [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. 【0030】 The applicant has manufactured three types of lock bodies: large, medium, and small. Specifically, these are three types for FEP100, FEP80, and FEP50. In Figure 1(c), the outer diameter of the outer flange portion 13 indicated by symbol a is, for example, 170 mm, 190 mm, and 230 mm; the inner diameter of the outer cylinder portion 12 indicated by symbol b is, for example, 69 mm, 106 mm, and 133.5 mm; the thickness of the outer flange portion 13 indicated by symbol c is, for example, 4 mm, 5 mm, and 5 mm; and the length of the outer cylinder portion 12 indicated by symbol d is, for example, 100 mm, 100 mm, and 110 mm. The thickness of the first packing portion 15 indicated by symbol e is, for example, 25 mm, 25 mm, and 30 mm. 【0031】 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 joined to the tip surface of the outer flange portion 13 by adhesive or the like. 【0032】 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 underground beam 1 around the through hole 2, preventing water from penetrating between it and the underground beam 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 【0033】 The crushable packing portion 16 is a component that easily collapses when pressure is applied. The thickness of the crushable packing portion 16 is 5 mm, but when the locking body 11 is tightened and it is crushed between the outer flange portion 13 and the wall surrounding the through-hole 2 of the underground beam 1, its thickness becomes, for example, 1 to 2 mm or less. In this embodiment, a soft urethane foam with the following physical properties is used. The physical properties of the first packing portion 15 and the crushable packing portion 16 are different. The air bubbles in the crushable packing portion 16 are continuous bubbles that are connected to each other. In addition, the crushable packing portion 16 of this embodiment has 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. <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) 【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 applicant has manufactured three types of mouse bodies: large, medium, and small. In Figures 1(a) and 1(b), the outer diameter of the inner flange portion 23 indicated by reference numeral A is, for example, 170 mm, 190 mm, and 230 mm; the inner diameter of the inner cylinder portion 22 indicated by reference numeral B is, for example, 41 mm, 70 mm, and 89 mm; the thickness of the inner flange portion 23 indicated by reference numeral C is, for example, 4 mm, 4 mm, and 4.5 mm; and the length of the inner cylinder portion 22 indicated by reference numeral D is, for example, 70 mm, 95 mm, and 114 mm. The thickness of the second packing portion 24 indicated by reference numeral E is, for example, 25 mm, 25 mm, and 30 mm. 【0038】 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. 【0039】 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, a 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 underground beam 1 around the through hole 2, preventing water from penetrating between it and the underground beam 1. 【0040】 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. 【0041】 A flexible waterproofing 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 seeping between the inner flange portion 23 and the underground beam 1. The waterproofing material 29 is filled inside the second packing portion 25. The waterproofing material 29 is plastic and easily deformable, so it is easily filled inside the second packing portion 25. 【0042】 The waterproofing material 29 is adhesive and fills in along the contours, preventing gaps from forming. As shown in Figure 5, even if water such as rainwater seeps into the ground and attempts to penetrate from the outside of the corrugated pipe material 5 and lock body 11, the waterproofing material 29 does not harden or soften upon contact with water w, and its viscosity and fluidity do not change. Therefore, the waterproofing and water-stopping properties do not deteriorate over a long period of time, protecting the cables inside the corrugated pipe material 5 from water and preventing malfunctions. 【0043】 [Pipe connection structure of this embodiment] The pipe connection structure using the pipe connector 10 of this embodiment will be described with reference to Figures 4 to 6 and Figure 10. The mouse body 21 can rotate while the second engaging portion 24 formed on the outer surface of the inner cylinder 22 screws onto the inner spiral grooves 6b of the corrugated pipe 5. As shown in Figure 4, the mouse body 21 is inserted into the inside of the tip of the corrugated pipe 5 from the left. When the mouse body 21 is screwed onto the inner surface of the corrugated pipe 5, the second packing portion 25 provided on the inside of the inner flange portion 23 of the mouse body 21 is pressed against the underground beam 1 around the through hole 2, resulting in a contact state. 【0044】 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 mouse body 21 attached, the distance between the mouse body 21 and the locking body 11 is further reduced, and the underground beam 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 mouse body 21. 【0045】 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 10(a), a 5mm thick crushed packing part 16, which is colored yellow, is attached by bonding it between the first packing part 15 and the underground beam 1. 【0046】 The material and thickness of the crushed packing portion 16 are determined such that when the locking body 11 is screwed in and properly tightened, the thickness of the crushed packing portion 16 is compressed to 1-2 mm or less. In addition to the thickness of the crushed packing portion 16 being compressed to 1-2 mm or less, the periphery of the crushed packing portion 16 is covered by the periphery of the first packing portion 15, whose outer diameter has slightly expanded due to the tightening pressure. As a result, to the operator, the yellow line on the side of the crushed packing portion 16, which was present before tightening was completed, gradually narrows in width and eventually appears to disappear. 【0047】 This allows the worker to use the disappearance of the yellow line on the crushed packing portion 16 as an indicator that the locking body 11 has been tightened properly, thus enabling proper tightening of the locking body 11. Figure 10(b) shows the state where the yellow line on the crushed packing portion 16 is no longer visible, indicating that the locking body 11 has been tightened to a good degree. The thickness of the first packing portion 15 of the locking body 11 and the second packing portion 25 of the mouse body 21 are compressed to about 5 mm when tightening is complete. In this state, the first packing portion 15 and the crushed packing portion 16 are tightly adhered to the underground beam 1 surrounding the through hole 2, further strengthening the watertightness and waterproofing. 【0048】 On the other hand, on the mouse body 21 side, the second packing portion 25 seals the surface of the underground beam 1 around the through hole 2, preventing water from seeping between it and the underground beam 1. Furthermore, since the water-stopping material 29 is filled in the central part of the annular second packing portion 25, the water-stopping and waterproofing properties are made stronger. 【0049】 [Characteristic configuration and effects of this embodiment] Conventionally, pipe connectors used in handholes had packing thicknesses of 15 mm or less. In contrast, in the pipe connector 10 of this embodiment, as described above, the thickness of both the first packing portion 15 and the second packing portion 25 is 25 mm or more. As a result, in this embodiment, the cushioning and flexibility of the first packing portion 15 and the second packing portion 25 are sufficiently high. Therefore, even if there are irregularities on the surface of the underground beam, the first packing portion 15 and the second packing portion 25 deform to conform to the irregularities, preventing gaps from forming, and ensuring tightness, waterproofing, and watertightness between the surface of the underground beam 1 and the pipe connector 10. 【0050】 In underground beams 1, the diameter of the through-holes 2 formed in the underground beams 1 is determined by the diameter of the pipe material, such as PVC pipes, installed by workers when performing underground beam construction at the construction site. According to the applicant's research, there were three types of pipe materials (small, medium, and large) that were frequently used in underground beam construction at construction sites, as shown in Figure 7. Specifically, two types of PVC pipes with outer diameters of 100 mm and 125 mm were used, and a 156 mm gas pipe was used. As a result, the inner diameters of the through-holes 2 in underground beams 1 were generally 100 mm, 125 mm, and 156 mm. In addition, the outer diameters of corrugated pipe material 5 were generally 66 mm, 103 mm, and 130 mm. 【0051】 After careful consideration, the applicant determined that it is preferable for the diameters of the outer flange portion 13 and the inner flange portion 23 to be such that they have a 25% margin over the minimum diameter required to completely block the through-hole 2, even when the corrugated pipe material 5 is at its maximum deflection within the through-hole 2. In other words, the case where the corrugated pipe material 5 is at its maximum deflection within the through-hole 2 is when the deviation of the center of the corrugated pipe material 5 from the center of the through-hole 2 is at its maximum (see upper panel (a) of Figure 7). 【0052】 In other words, when the outer flange portion 13 of the lock body 11 and the inner flange portion 23 of the mouse body 21 are X (mm) and the outer diameter of the corrugated pipe material 5 is Y (mm), it is preferable that the radius Z1 (mm) of the outer flange portion 13 and the radius Z2 (mm) of the inner flange portion 23 satisfy the following formula (1). Z1≧ 1.25×(X / 2+(YX))···(1) Z2≧ 1.25×(X / 2+(YX))···(1) 【0053】 In the example in Figure 7, the values ​​of X / 2 are 33mm, 51.5mm, and 65mm, and the values ​​of YX are 34mm, 22mm, and 26mm. Therefore, the values ​​of X / 2+(YX) are 67mm, 73.5mm, and 91mm. Multiplying these values ​​by 1.25 gives 83.75mm, 91.875mm, and 113.75mm. For example, the radius Z1 of the outer flange portion 13 and the radius Z2 of the inner flange portion 23 should be 85mm, 95mm, and 115mm. Converting these to diameters, they become 170mm, 190mm, and 230mm, and the diameters of the small, medium, and large types of outer flange portions 13 and inner flange portions 23 were determined. 【0054】 If the diameters of the outer flange portion 13 and the inner flange portion 23 are too small, the possibility of not being able to seal the entire through-hole 2 and thus failing to ensure watertightness increases. On the other hand, if the diameters of the outer flange portion 13 and the inner flange portion 23 are too large, the possibility of gaps forming between the underground beam 1 and the outer flange portion 13 and the inner flange portion 23 increases. In the pipe connector 10 of this embodiment, the optimal size is determined by the above formula (1), so watertightness is properly ensured and there is no risk of gaps forming. 【0055】 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, causing the underground beam 1 surrounding the through hole 2 to be clamped, thus completing the connection and fixing of the corrugated pipe 5. However, at the construction site of the underground beam 1, there is a demand to further tighten the mouth body 21 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. In the underground beam 1, since the beam is thick and the length of the through-hole 2 is long, 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, in the case of the underground beam 1, a pipe connection structure is required that can efficiently fill the 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 of 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 underground beam 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】 [Second modified example of the embodiment] Referring to Figure 11, a pipe connection structure according to a second modified example of this embodiment will be described. This modified example is a pipe connection structure used when underground beams 1a and 1b are adjacent to each other and the distance between the two underground beams 1a and 1b is relatively short, as shown in Figure 11. In this modified example, the locking bodies 11 are used to sandwich the wall around the through-hole 2 of the underground beam 1. In this case, a problem at the work site may be that the time required to screw the locking body 11 onto the outer circumference of the corrugated pipe 5 increases. Therefore, in this modified example, the locking body 11 has a split structure that allows it to be split into two. This makes it possible to attach the locking body 11 to an appropriate position in the middle of the corrugated pipe 5 and start screwing from the attachment position, without having to start screwing from the tip of the corrugated pipe 5, thereby shortening the work time. 【0066】 [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. 【0067】 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. 【0068】 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] 【0069】 This invention can be used in pipe connectors and the like for connecting and fixing corrugated pipe materials to through holes formed in underground beams. [Explanation of symbols] 【0070】 1 underground beam 2. Through hole (sleeve) 3 Reinforcement bars 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 connection structure is provided in which a corrugated pipe material, with spirally formed irregularities on its inner and outer surfaces, is connected and fixed to a through-hole formed in an underground beam by sandwiching the underground beam surrounding the through-hole using a locking body and a mouth body. 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, and a first packing portion attached to the outer flange 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 thickness of the first packing portion and the thickness of the second packing portion are both 25 mm or more. The pipe material contact structure is A wrap-around locking material that can be wrapped around and locked to the outer surface of the corrugated pipe material, It also includes caulking material, The aforementioned winding locking material is attached to the outer surface of the corrugated pipe material at a required position inside the through hole, The caulking material is filled to fill the space between the wrapping locking material and the mouse body in a pipe connection structure. [Claim 2] The outer flange portion of the lock body and the inner flange portion of the mouse body are The pipe connection structure according to claim 1, wherein, when the outer diameter of the corrugated pipe is X (mm) and the outer diameter of the pipe used to form the through hole in the underground beam construction is Y (mm), the radius Z1 (mm) of the outer flange portion and the radius Z2 (mm) of the inner flange portion both satisfy the following formula (1). Z1 ≧ 1.25×(X / 2+(Y-X))...(1) Z2 ≧ 1.25×(X / 2+(Y-X))...(1) [Claim 3] The pipe connection structure according to claim 1 or 2, wherein the inner flange portion of the mouse body is provided with an engaging portion on the side opposite to the side to which the second packing portion is attached, which can be engaged with a tightening jig.

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