Support fittings and coupling-type pipe joint structures with support fittings

Abstract

To provide a support fitting and a coupling-type pipe joint structure with a support fitting that can prevent detachment and enhance restraint force, and can be manufactured at low cost and with a short lead time. [Solution] A support fitting 1 for a coupling-type pipe joint 10 that connects a pair of butted metal pipes M1, M2 or resin pipes, comprises a first support part 13 that supports the coupling-type pipe joint 10, a pair of U-bolts 12 that fix the ends of the pair of metal pipes M1, M2 respectively, and a pair of second support parts 14 installed on the outside of the first support part 13, having a plurality of bolt holes 14a, extending in a direction perpendicular to the axial direction X of the metal pipes M1, M2 to hook the U-bolts 12, the first support part 13 and the pair of second support parts 14 are stepped, and between the first support part 13 and the second support parts 14 there is a pair of rising parts 15 having plate surfaces perpendicular to the axes of the metal pipes M1, M2, and an opening is formed in the first support part 13 to accommodate the coupling-type pipe joint 10.

Description

Technical Field

[0001] The present invention relates to a support fitting for a coupling type pipe joint that connects abutting metal pipes or resin pipes. More specifically, it relates to a support fitting that prevents the metal pipe or resin pipe abutted due to construction errors from coming out of the coupling type pipe joint and fluid leakage, and a support fitting that fixes the pipe end of the metal pipe with a support fitting to enhance the restraint force, and a coupling type pipe joint structure with a support fitting.

Background Art

[0002] Conventionally, mechanical pipe joints that connect metal pipes or resin pipes by mechanical methods are known. Also, as mechanical pipe joints, various types such as press type, expanding pipe type, nut type, forged screw type, insertion type, coupling type (strap - grip type), etc. are known.

[0003] Among these, the coupling type pipe joint has a structure in which a rubber sleeve and a grip ring are housed in the coupling body, and the coupling body is tightened with bolts and nuts to bite the grip ring into the pipe end of the metal pipe or resin pipe to seal the pipe end. This coupling type pipe joint has an excellent feature that it can easily connect metal pipes to each other without the need for secondary processing such as threading or grooving at the pipe end to prevent the pipes from coming out.

[0004] However, since the coupling type pipe joint has no secondary processing for preventing the pipe from coming out at the pipe end, when a high pressure is applied inside the pipe, a high pull - out prevention force (grip force: tensile strength in the pipe axis direction) is required to prevent the metal pipe or resin pipe from coming out. Also, in some cases, the coupling type pipe joint is required to take measures for preventing the pipe from coming out and enhancing the restraint force due to concerns about the pipe coming out. In that case, the support fitting for preventing the pipe from coming out is a custom - made product for each order, which takes time until delivery and increases costs.

[0005] For example, Patent Document 1 discloses a pipe joint 10 in which the outer circumferential surfaces of the pipe ends of two pipes 30 abutting against each other are surrounded by a housing 11 with a substantially C-shaped cross-section that houses a seat lock mechanism 20 having a seat ring 21 and a lock ring 22, and the circumferential ends 12, 12 of the housing 11 are tightened with fastening members 18 such as bolts to join the pipes 30, 30 together, wherein contact portions 13 are provided on either one or both of the ends 12, 12 of the housing 11, so that when the housing 11 is tightened, the contact portion 13 abuts against the other contact portion 13 or the other end 12 of the housing 11 (see Claim 1 of the claims, paragraphs

[0015] to

[0030] of the specification, and Figures 1 and 2 of the drawings of Patent Document 1).

[0006] The pipe joint 10 described in Patent Document 1 is said to be able to easily regulate the tightening torque and tighten with the appropriate amount to reliably seal the piping, and to be able to perform stable tightening and seal the joint even when joining pipes of different diameters.

[0007] Furthermore, Patent Document 2 discloses a diameter-reducing joint in which a pipe P is joined by a lock ring mechanism 160 installed inside a cylindrical housing 151 with a C-shaped cross-section that surrounds a sealing sleeve 161, with both ends of the housing 151 fastened with bolt fastening members 168, wherein a slit 154 of an appropriate length is provided along the circumferential direction from one or both ends of the housing 151 (see Claim 1 of the claims, paragraphs

[0027] to

[0055] of the specification, and Figures 2, 3, 11, etc. of the drawings of Patent Document 2).

[0008] The diameter-reducing joint described in Patent Document 2 is said to be able to firmly join pipes while maintaining a locking ring function and exhibiting high sealing performance, even when there is an error in the actual pipe diameter when joining pipes of the same nominal diameter, or when joining pipes of different diameters or pipes of different materials such as metal and resin.

[0009] However, coupling-type pipe joints such as the pipe joint 10 described in Patent Document 1 and the diameter-reducing joint described in Patent Document 2 could not eliminate concerns that the pipe might come loose, and measures to prevent loosening and vibration were required.

[0010] Furthermore, fixing brackets that secure metal pipes, resin pipes, and other piping with U-bolts and U-shaped fittings are widely used. However, these commercially available fixing brackets are only for fixing pipes to concrete structures, and when applied to coupling-type pipe joint structures, each requires a separate fixing point to the concrete structure, diminishing the advantage of not requiring secondary processing at the ends of metal pipes. This results in increased manufacturing costs. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2003-172485 [Patent Document 2] Japanese Patent Publication No. 2008-75884 [Overview of the project] [Problems that the invention aims to solve]

[0012] Therefore, the present invention was devised in view of the above-mentioned problems, and its objective is to provide a support fitting and a coupling-type pipe fitting structure with a support fitting that can be manufactured at low cost and with a short lead time, while appropriately implementing measures to prevent detachment and enhance the restraining force in a coupling-type pipe fitting. [Means for solving the problem]

[0013] The support fitting according to the first invention is a support fitting for increasing the restraining force of a coupling-type pipe fitting that connects a pair of butted metal pipes or resin pipes, and comprises: a first support part that supports the coupling-type pipe fitting; a pair of U-shaped bolts that fix the ends of the pair of metal pipes or resin pipes, respectively; and a pair of second support parts installed on the outside of the first support part, having a plurality of bolt holes through which the U-shaped bolts are inserted, and extending in a direction perpendicular to the axial direction of the metal pipes or resin pipes to hook the U-shaped bolts, wherein there is a step between the first support part and the pair of second support parts, and between the first support part and the second support parts there is a pair of rising parts having a plate surface perpendicular to the axis of the metal pipes or resin pipes, and the first support part has an opening formed therein for accommodating the coupling-type pipe fitting.

[0014] The support fitting according to the second invention is characterized in that, in the first invention, at least one of the pair of rising portions has an arc-shaped or polygonal groove formed thereon, corresponding to the outer shape of the metal pipe or the resin pipe.

[0015] The support fitting according to the third invention is characterized in that, in the second invention, it further comprises one or more pairs of rising portions parallel to the pair of rising portions, and at least one of these rising portions has an arc-shaped or polygonal groove formed thereon.

[0016] The support fitting according to the fourth invention is characterized in that, in the second or third invention, the groove portion has a notch formed therein that contacts the outer surface of the metal pipe or the resin pipe to increase the coefficient of friction.

[0017] The coupling-type pipe joint structure with a support fitting according to the fifth invention is a coupling-type pipe joint structure in which butted metal pipes or resin pipes are connected by a coupling-type pipe joint, characterized in that the ends of the pair of butted metal pipes or resin pipes are fixed by a support fitting described in any of the first to third inventions.

[0018] The coupling-type pipe joint structure with a support fitting according to the sixth invention is a coupling-type pipe joint structure in which butted metal pipes or resin pipes are connected by a coupling-type pipe joint, wherein the ends of the pair of butted metal pipes or resin pipes are fixed by the support fitting described in either claim 2 or 3, the groove portion of the support fitting has a notch formed therein that contacts the outer surface of the metal pipe or resin pipe to increase the coefficient of friction, and the outer surfaces of the pair of butted metal pipes are hooked in place by contacting the notch. [Effects of the Invention]

[0019] According to the first to sixth inventions, high gripping force can be obtained without performing secondary processing such as threading or grooving on the pipe ends, and measures to prevent detachment and vibration can be easily applied in a short time to coupling-type pipe joints. Moreover, according to the first to sixth inventions, since no special molds are required and the fittings are made only from general-purpose parts and general-purpose processing, not only are manufacturing costs reduced, but the delivery date required by the client can be met, and the construction period and cost of the pipe work itself can be reduced.

[0020] In particular, according to the second and third inventions, since an arc-shaped groove corresponding to the outer shape of the metal pipe or resin pipe is formed in the rising portion having a plate surface perpendicular to the axis of the metal pipe or resin pipe, the end of the metal pipe or resin pipe can be firmly supported, and a high level of anti-loosening and anti-vibration function can be achieved.

[0021] In particular, according to the fourth and sixth inventions, notches are formed that contact the outer surface of the metal pipe or resin pipe to increase the coefficient of friction, thereby complementing the gripping force of the coupling-type pipe joint and providing even higher anti-detachment and anti-vibration functions. [Brief explanation of the drawing]

[0022] [Figure 1] Figure 1 is a perspective view showing a coupling-type pipe joint structure with a support fitting according to an embodiment of the present invention. [Figure 2] Figure 2 is an exploded perspective view showing the configuration of the coupling type pipe joint structure with support fittings according to the above embodiment. [Figure 3] Figure 3 is a side view seen in the pipe axis direction showing the state where the support fittings according to the embodiment of the present invention are assembled. [Figure 4] Figure 4 is a view showing the main body plate of the support fitting alone, (a) is a front view seen in the orthogonal direction Y orthogonal to the pipe axis direction X, (b) is a front view seen in the pipe axis direction X, and (c) is a plan view. [Figure 5] Figure 5 is a perspective view showing the coupling type pipe joint according to the embodiment of the present invention. [Figure 6] Figure 6 is a front view seen in the pipe axis direction of the above coupling type pipe joint. [Figure 7] Figure 7 is a right side view showing the above coupling type pipe joint. [Figure 8] Figure 8 is an end view taken along line A-A of Figure 6 showing the above coupling type pipe joint. [Figure 9] Figure 9 is a perspective view showing the grip ring of the above coupling type pipe joint. [Figure 10] Figure 10 is a partial cross-sectional perspective view showing a state where a part of the rubber sleeve of the above coupling type pipe joint is cut along the pipe axis direction. [Figure 11] Figure 11 is a perspective view showing the triangular ring of the above coupling type pipe joint.

Embodiments for Carrying out the Invention

[0023] Hereinafter, the coupling type pipe joint structure with support fittings and the support fittings according to the embodiment of the present invention will be described with reference to the drawings.

[0024] [Coupling Type Pipe Joint Structure with Support Fittings] A coupling-type pipe joint structure 100 with a support fitting (hereinafter also simply referred to as the coupling-type pipe joint structure 100) according to an embodiment of the present invention will be described using Figures 1 and 2. Figure 1 is a perspective view showing the coupling-type pipe joint structure 100, and Figure 2 is an exploded perspective view showing the configuration of the coupling-type pipe joint structure 100.

[0025] As shown in Figures 1 and 2, this coupling-type pipe joint structure 100 is a coupling-type pipe joint structure in which a pair of butted metal pipes M1, M2 or resin pipes are connected by a coupling-type pipe joint 10, and includes a coupling-type pipe joint 10 for connecting a pair of butted metal pipes M1, M2 or resin pipes, and a support fitting 1 for increasing the restraining force of the coupling-type pipe joint 10. The pipes connected by the coupling-type pipe joint structure 100 are not limited to metal pipes, and it is possible to connect stainless steel pipes or resin pipes, but the case of connecting a pair of metal pipes M1 and M2 will be explained as an example.

[0026] (Support bracket) First, the support fitting 1 according to an embodiment of the present invention will be described using Figures 2, 3, and 4. Figure 3 is a side view of the support fitting 1 according to an embodiment of the present invention as seen in the direction of the pipe axis, and Figure 4 is a diagram showing the main body plate 11 of the support fitting 1 alone, where (a) is a front view seen in the orthogonal direction Y perpendicular to the pipe axis X, (b) is a front view seen in the pipe axis X, and (c) is a top view. Note that the symbol X indicates the pipe axis X, the symbol Y indicates the orthogonal direction Y which is the horizontal direction perpendicular to the pipe axis X, and the symbol Z indicates the vertical direction.

[0027] As shown in Figures 2 and 3, this support fitting 1 mainly consists of a main plate 11 formed from a single steel plate using only general-purpose processing methods that can be processed in most factories, such as bending and laser processing (cutting), and a pair of U-bolts 12, 12 that fix the ends of a pair of metal pipes M1 and M2, respectively.

[0028] (Main plate) The main plate 11 includes a first support portion 13 that abuts against and supports the coupling-type pipe joint 10, and a pair of second support portions 14 for hooking the U-bolts 12. Furthermore, the plate surfaces of the first support portion 13 and the second support portions 14 are at different distances from the metal pipes M1 and M2. In other words, there is a step between the first support portion 13 and the second support portions 14, and a pair of inner rising portions 15 are provided, each having a plate surface perpendicular to the pipe axis direction X of the metal pipes M1 and M2, while a pair of outer rising portions 16 are provided on the outside of the pair of second support portions 14, each having a plate surface perpendicular to the pipe axis direction X.

[0029] Therefore, even if repeated stress is applied to the support fitting 1 due to pressure fluctuations of the fluid flowing inside the metal pipes M1 and M2, such as the water hammer phenomenon, the second moment of area with respect to that stress can be significantly increased, and the necessary strength can be secured even if the thickness of the main plate 11 is reduced.

[0030] Furthermore, the first support portion 13 of the main plate 11 has a rectangular opening 13a that serves as a space for accommodating the coupling-type pipe joint 10, which is formed by joining a pair of metal pipes M1 and M2.

[0031] Furthermore, a pair of bolt holes 14a, 14a are drilled in the second support portion 14 of the main plate 11 through which the U-shaped bolt 12 is inserted. All of these bolt holes 14a are elongated to allow adjustment of the connection position of the U-shaped bolt 12 with the main plate 11.

[0032] In addition, the inner rising portion 15 has an arc-shaped groove 15a formed therein that corresponds to the outer shape (diameter of the outer surface) of the metal pipes M1 and M2, and a notch 15b formed therein that contacts the outer surface of the metal pipes M1 and M2 to increase the coefficient of friction.

[0033] Furthermore, the outer rising portion 16 also has an arc-shaped groove 16a formed thereon corresponding to the outer shape (pipe diameter of the outer surface) of the metal pipes M1 and M2, and a notch 16b formed thereon that contacts the outer surface of the metal pipes M1 and M2 to increase the coefficient of friction.

[0034] In this embodiment, the main plate 11 is exemplified as having two pairs of inner rising portions 15 and outer rising portions 16 having plate surfaces perpendicular to the pipe axis direction X. However, it is also possible to have three or more pairs of rising portions having plate surfaces perpendicular to the pipe axis direction X. Furthermore, the arc-shaped grooves 15a and 16b formed in the inner rising portions 15 and outer rising portions 16 are not limited to arc shapes, but may be polygonal or other shapes as long as they improve the restraining force of the coupling-type pipe joint.

[0035] (U-bolt) Furthermore, as shown in Figures 2 and 3, the U-bolt 12 is a commercially available, general-purpose steel or stainless steel U-bolt, with threaded portions 12a formed at both ends that form the lower end of the U-shape. This U-bolt 12 is inserted through the bolt hole 14a of the second support portion 14 of the main plate 11, and a washer 12b is placed between it and a nut 12c is screwed onto the threaded portion 12a, thereby fixing the ends of the metal pipes M1 and M2 together with the support fitting 1 (see also Figure 1).

[0036] As described above, the support fitting 1 according to this embodiment allows for quick and easy prevention of detachment and vibration at the joint where butt-jointed metal pipes M1 and M2 are connected by a coupling-type pipe fitting 10, without the need for secondary processing. Furthermore, since the support fitting 1 according to this embodiment consists of a main body plate 11 formed from a single steel plate using only bending or laser processing (cutting) and a general-purpose U-bolt 12, it not only reduces manufacturing costs but also allows for quick manufacturing and delivery according to the customer's requirements.

[0037] Furthermore, the inner and outer rising portions 15 and 16 of the support fitting 1 are formed with arc-shaped grooves 15a and 16a corresponding to the diameter of the outer surfaces of the metal pipes M1 and M2, and notches 15b and 16b that contact the outer surfaces of the metal pipes M1 and M2 to increase the coefficient of friction. This complements the gripping force of the coupling-type pipe joint, enabling even higher levels of anti-detachment and anti-vibration functionality.

[0038] Next, the coupling-type pipe joint 10 will be described using Figures 5 to 11. As an example of the coupling-type pipe joint 10, a general strub-grip type applicable to steel pipes, stainless steel pipes, and VP pipes will be described. As shown in Figures 5 to 8, the coupling-type pipe joint 10 according to the embodiment of the present invention includes a casing 2 which is the coupling body. This coupling-type pipe joint 10 is a coupling-type pipe joint in which the casing 2 is fitted over the butted ends of two metal pipes and tightened by a tightening means 20 described later to connect these pipe ends.

[0039] Figure 5 is a perspective view showing a coupling-type pipe joint 10 according to an embodiment of the present invention. Figure 6 is a front view of the coupling-type pipe joint 10 as seen in the direction of the pipe axis, and Figure 7 is a right side view thereof. Figure 8 is an end view of line AA of Figure 6 showing the coupling-type pipe joint 10.

[0040] As shown in Figure 8, the casing 2 houses a pair of grip rings 3, 3, and cylindrical rubber sleeves 4 interposed within these grip rings 3.

[0041] Furthermore, as shown in Figure 8, a triangular ring 5 with a triangular cross-section is provided on the inside of the base end (the part facing the casing 2) of the grip rings 3, 3.

[0042] (Casing) Casing 2 is formed by bending a steel plate with a thickness of 1.2 mm to 4.5 mm, such as SUS304, into a C-shaped cross-section, and then rolling this C-shaped steel material into a cylindrical shape with a slit-shaped opening 2a (see Figure 5, etc.). Casing 2 functions as the housing for the entire coupling-type pipe joint 10.

[0043] Furthermore, as shown in Figures 5 and 6, the casing 2 has a portion of the steel material at the end that is in contact with the slit-shaped opening 2a that is folded back into a bag shape and secured, forming a pair of fastening means housings 2b. The casing 2 is configured to reduce in diameter by tightening the slit-shaped opening 2a with the fastening means 20, thereby tightening the mounted steel pipe and connecting the pipe ends.

[0044] (Fastening means) In this embodiment, the fastening means 20 comprises two M12 socket head cap screws 21 made of steel. The fastening means 20 also comprises one hole bar 22, which is a rod washer made of steel, and one sole bar 23, which is a rod nut.

[0045] As shown in Figures 5 and 7, the fastening means housing section 2b has three elongated holes 2c through which socket head cap screws 21 are inserted, and the socket head cap screws 21 are inserted through these elongated holes 2c. These socket head cap screws 21 are then screwed to the thread bar 23 via a hole bar 22, which has three through holes.

[0046] (Grip ring) Next, the grip ring 3 of the coupling-type pipe fitting 10 according to this embodiment will be described using Figure 9. Figure 9 is a perspective view showing the grip ring 3 of the coupling-type pipe fitting 10.

[0047] The grip ring 3 is made of a steel plate about 1 mm thick, which has a relatively higher hardness than the metal pipes M1 and M2 to which it is connected. As shown in Figure 9, the grip ring 3 is a C-shaped ring when viewed in the direction of the pipe axis, with a notch 3a formed in which a part of the ring shape is cut out so that it can be reduced in diameter.

[0048] Furthermore, the grip ring 3 has numerous notches formed to create a comb-like cutting edge 3b that bites into the hard stainless steel pipe, and as shown in Figure 8, it is installed at a 45-degree inclination inward relative to the outer surface of the casing 2. Therefore, when the grip ring 3 bites into the steel pipe, it can exert the desired gripping force against the force that pulls the pipe outward.

[0049] In addition, the reference numeral 6 shown in Figure 8 is a round ring 6 made of steel wire such as SUS304, which prevents the grip ring 3 from tipping outwards.

[0050] (rubber sleeve) Next, the rubber sleeve 4 of the coupling-type pipe joint 10 according to this embodiment will be described using Figure 10. Figure 10 is a partial cross-sectional perspective view showing a part of the rubber sleeve 4 of the coupling-type pipe joint 10 cut along the pipe axis. In the illustrated form, a part of the rubber sleeve 4 is shown cut to show its special cross-sectional shape, but the rubber sleeve 4 is a cylindrical member without notches such as slits.

[0051] In this embodiment, the rubber sleeve 4 is a cylindrical sleeve made of synthetic rubber such as ethylene propylene rubber or nitrile rubber (NBR), and has the function of sealing to prevent the fluid flowing inside the pipe of the connected pipe from leaking out of the joint. Of course, the rubber sleeve according to the present invention must be made of a material that exhibits rubber elasticity, undergoing large elastic deformation with a small force and returning to its original shape the instant that force is removed.

[0052] As shown in Figure 10, the rubber sleeve 4 has folded-over sections 4a at both ends of a cross-section cut along the pipe axis, with a groove 4b formed on the inside of these folded-over sections. A spring 41, which is an annular (ring-shaped) coil spring, is fitted into this groove 4b. As a result, the adhesion (sealing force) of the folded-over sections 4a at both ends of the rubber sleeve 4 to the pipe is increased, improving the sealing force.

[0053] Furthermore, three V-shaped ribs 4c are formed on the inner side of the folded portion 4a, improving the rigidity of the central part of the thin cross-section where the folded portion 4a is absent, thereby preventing the rubber sleeve 4 from twisting and breaking. In addition, the formation of the V-shaped ribs 4c increases the shape stability when the rubber sleeve 4 is tightly fitted to the pipe, and allows the sealing force to be maintained even when high pressure is applied inside the pipe.

[0054] (Triangular ring) Next, the triangular ring 5 of the coupling-type pipe fitting 10 according to this embodiment will be described using Figure 11. Figure 11 is a perspective view showing the triangular ring 5 of the coupling-type pipe fitting 10.

[0055] The triangular ring 5 is made of steel with a triangular cross-section (right-angled isosceles triangle), and as shown in Figure 11, a notch 5a is formed in which a part is cut out so that the diameter can be reduced, and it is a C-shaped ring when viewed in the direction of the pipe axis.

[0056] As shown in Figure 8, a pair of these triangular rings 5 ​​are installed on the inside of the base ends of the aforementioned grip rings 3, 3. The triangular rings 5 ​​support these grip rings 3 with their 45-degree inclined surfaces, which are right-angled isosceles triangles, and have the function of maintaining their inclination angle. Here, the base end refers to the end on the outer side of the casing 2, as shown in Figure 8.

[0057] (Slide plate) Next, the slide plate 7 of the coupling-type pipe joint 10 according to this embodiment will be described with reference to Figures 5, 6, and 8.

[0058] The slide plate 7 is made of a thin steel plate, and as shown in Figure 8, edges 7a are formed by bending both ends in the direction of the pipe axis so as to cover the outer surface of the rubber sleeve 4.

[0059] The slide plate 7 is bent into an arc shape (not shown) from a steel plate with an edge 7a formed thereon, according to the curvature of the inner circumferential surface of the casing 2. As shown in Figures 5 and 6, the slide plate 7 is installed between the casing 2 and the rubber sleeve 4 so as to straddle the opening 2a of the casing 2. The slide plate 7 is configured to slide along the inner circumferential surface of the casing 2 when tightened by the tightening means 20, which causes the opening 2a to shrink. The slide plate 7 covers and supports the outer circumferential surface of the rubber sleeve 4 at the opening 2a of the casing 2, and has the function of preventing the rubber sleeve 4 from bulging due to the pressure inside the pipe.

[0060] (Installation procedure) The procedure for attaching the coupling-type pipe joint structure 100 according to this embodiment to a pair of butted metal pipes M1, M2 or resin pipes will now be described. First, the coupling-type pipe joint structure 100 is fixed to the pair of butted metal pipes M1, M2 or resin pipes by the following steps: the main body plate 11 is brought into contact with and supported by the coupling-type pipe joint structure 10, and the U-bolts 12 are fixed to the main body plate 10.

[0061] As described above, the coupling-type pipe joint structure 100 according to this embodiment provides a high gripping force with the coupling-type pipe joint 10 without requiring secondary processing such as threading or grooving on the pipe ends of the pair of metal pipes M1 and M2 to be connected. Furthermore, the support fitting 1 allows for quick and easy implementation of measures to prevent detachment and vibration in the coupling-type pipe joint structure 100.

[0062] Although the coupling-type pipe joint structure 100 and support fitting 1 according to embodiments of the present invention have been described in detail above, the embodiments described above or illustrated are merely examples of embodiments that have been materialized in carrying out the present invention, and the technical scope of the present invention should not be interpreted as being limited by these embodiments.

[0063] In particular, as an example of the coupling-type pipe fitting 10, a double-grip type with high grip strength that can be applied to stainless steel pipes was described, but it goes without saying that the coupling-type pipe fitting according to the present invention can also be applied to general single-type fittings. [Explanation of symbols]

[0064] 100: Coupling-type pipe fitting structure (with support fittings) 1: Support bracket 11: Main plate 12: U-bolt 12a: Threaded part 12b: Washer 12c: Nut 13: First support 13a: Opening 14: Second support 14a: Bolt hole 15: Inner rising section (rising section) 15a: Groove 15b: Notch 16: Outer rising section (rising section) 16a: Groove 16b: Notch M1,M2: Metal tube 10: Coupling type pipe fittings 2: Casing (coupling body) 2a: opening 2b: Fastening means housing 2c: long hole 20: Fastening means 21: Hex socket head cap screws (bolts) 22: Hole bar (rod washer) 23: Sored bar (rod nut) 3: Grip ring 3a: Notch 3b: Cutting edge 4: Rubber sleeve 4a: Folded section 4b: Groove 4c: Mountain Rib 41: Annular spring (spring) 5: Triangular ring 5a: Notch 6: Round ring 7: Slide plate 7a:Edge

Claims

1. A support fitting for increasing the restraining force of a coupling-type pipe joint that connects a pair of butted metal or resin pipes, The coupling-type pipe joint comprises a first support portion for supporting the coupling-type pipe joint, a pair of U-shaped bolts for fixing the ends of the pair of metal pipes or resin pipes, and a pair of second support portions installed on the outside of the first support portion, having a plurality of bolt holes through which the U-shaped bolts are inserted, and extending in a direction perpendicular to the axial direction of the metal pipes or resin pipes to hook and secure the U-shaped bolts. The first support portion and the pair of second support portions are separated by a step, and between the first support portion and the second support portions are a pair of rising portions having a plate surface perpendicular to the axis of the metal pipe or the resin pipe. The first support portion has an opening for accommodating the coupling-type pipe joint. A support bracket characterized by the following features.

2. At least one of the pair of raised sections has an arc-shaped or polygonal groove formed therein, corresponding to the outer shape of the metal pipe or the resin pipe. The support fitting according to claim 1, characterized by the following:

3. The system further comprises one or more pairs of rising portions parallel to the aforementioned pair of rising portions, and at least one of these rising portions has an arc-shaped or polygonal groove formed therein. The support fitting according to claim 2, characterized by the following:

4. The groove portion is formed with notches that contact the outer surface of the metal pipe or the resin pipe to increase the coefficient of friction. The support fitting according to claim 2 or 3, characterized by the above.

5. A coupling-type pipe joint structure in which butt-to-butt metal pipes or resin pipes are connected by a coupling-type pipe joint, The end of the pair of butted metal or resin pipes is fixed with the support fitting described in any one of claims 1 to 3. A coupling-type pipe joint structure with support fittings, characterized by the following:

6. A coupling-type pipe joint structure in which butt-to-butt metal pipes or resin pipes are connected by a coupling-type pipe joint, The end of the pair of butted metal or resin pipes is fixed with the support fitting described in either claim 2 or 3 above. The groove portion of the support fitting has notches formed in it that contact the outer surface of the metal pipe or the resin pipe to increase the coefficient of friction. The outer surfaces of the pair of metal or resin pipes that are butted together are secured by the notches abutting against each other. A coupling-type pipe joint structure with support fittings, characterized by the following:

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