JP2015531046A - One-touch three-stage fastening device for joint pipe for pressure pipe connection and pressure pipe construction method using the same - Google Patents

Abstract

The present invention relates to a one-touch three-stage fastening device for a joint pipe for pressure pipe connection and a method of constructing a pressure pipe using the same, and in particular, a 'fixing structure formed in a pressure pipe insertion / contact part A and a bushing insertion / contact part D By forming an organic fastening structure composed of “a double frictional resistance structure” by the fastener 20 and a “watertight structure” by watertight rubber packing inside the joint pipe for pressure pipe connection, This is characterized by having a one-touch type fastening structure in which the joint and the fixing are completed by only one operation of pushing into the joint pipe for pressure pipe connection. Not only is the one-touch system easy to connect and connect, the connection work is efficient, but it is natural that the construction period can be shortened. Therefore, since the operator does not need to perform joint work directly, a separate work excavation space is not required, and the excavation work is efficient and economical.

Description

  The present invention relates to a one-touch three-stage fastening device for a joint pipe for connecting a pressure pipe and a method of constructing a pressure pipe using the same, and in particular, a 'fixation formed on a pressure pipe insertion / contact portion A and a bushing insertion / contact portion D. By forming an organic fastening structure consisting of a “structure”, a “double frictional resistance structure” by the fastener 20 and a “watertight structure” by watertight rubber packing in the joint pipe for pressure pipe connection, It is characterized by having a one-touch type fastening structure in which the fitting and fixing are completed by only one operation of pushing the pipe into the pressure pipe coupling joint pipe.

  Because it is a one-touch type, not only is the joint / connection work easy and the connection work efficient, but it is natural that the construction period can be shortened. Since it is a structure that can be fixed, it is not necessary for the operator to perform joint work directly, so a separate work excavation space is not required, and the excavation work is efficient and economical.

  A pipe such as a water supply pipe, an oil feed pipe, or a gas pipe that is filled with fluid and flows due to a pressure difference is called a pressure pipe. The fluid flow in the pressure pipe flows due to the pressure difference between the pressure pipe ends. A fluid such as water, oil or gas is transferred to several tens of hundreds of kilometers through a water supply pipe or an oil feeding pipe. The length of the pressure tube is manufactured in a certain unit length for convenience of manufacture and transportation. A pressure tube per unit length is provided. At this time, the connecting pipe that joins the unit lengths is usually referred to as a “joint pipe” (see FIG. 1a). “Joint pipes” have various forms. That is, there are various shapes such as a single shape, an L shape, a T shape, and a cross shape.

The diameter and size of the pressure tube are also diverse. Usually, its diameter ranges from 15 mm to 3 m. The pressure pipe is largely divided into a synthetic resin pipe, a ferrous pipe and a non-ferrous metal pipe depending on the material to be manufactured. The pressure intensity of the pressure tube is also diverse. In the case of waterworks, the water pressure usually reaches 10 to 30 kg / cm ² . In particular, the connection site where the “joint pipe” and the pressure pipe are connected must be structured to withstand strong fluid pressure. Since the high pressure acts on the pressure tube, the degree of water leakage (or air leakage) becomes serious even if there is a gap as large as the needle hole. In the case of flammable substances that are harmful to the human body, the damage cannot be estimated. A conventional reinforcing technique for reducing such damage, that is, a conventional reinforcing structure that reinforces a connection portion where a “joint pipe” and a pressure pipe are connected is as follows.

  First, the reinforcing structure of Korean registered utility model No. 20-0283812 (hereinafter referred to as “prior art 1”) will be described.

  1a and 1b, the joint tube 100 of the 'prior art 1' has each end portion to which the pipe 300 is coupled protrudes outward, and the inner diameter surface is formed with a bent end so that the pipe 300 can be inserted. . The bent end is formed with an inner bent end 105 and an outer bent end 106 at a right angle outward from the inner diameter of the joint pipe 100. One end of the pipe 300 is inserted into the inner bent end 105, and a pressure projection 110 is continuously formed in the outer bent end 106 while forming a circle. The joint pipe connecting device 200 is mainly composed of a sealing material 210, a clip 220, and a cap 230. The sealing material 210 is a member intended for watertightness as a rubber material. A sealing groove 215 is formed on one side surface of the sealing material 210 corresponding to the pressure protrusion 110. The outer diameter surface of the pipe is inserted into the inner diameter surface of the ring-shaped sealing material 210. The inner surface of the sealing material 210 and the outer surface of the pipe 300 are in close contact with each other, thereby increasing water tightness. The clip 220 is installed in close contact with the sealing material 210 while the inner surface of the sealing material 210 and the outer surface of the pipe 300 are in close contact with each other. At this time, the saw-shaped slip preventing means 225 formed on the inner diameter surface of the clip 220 and the pipe 300 are in contact with each other.

  The cap 230 is a means for finally binding the joint pipe 100 and the pipe 300 while enclosing the sealing material 210 and the clip 220. As shown in FIG. 1 c, the cap 230 separated into a semicircular shape is fastened by a bolt 226 and a fastening hole 227. As described above, in the “prior art 1”, the joint pipe 100 and the pipe 300 having water tightness are connected by the interaction of the sealing material 210, the clip 220, and the cap 230. However, the connecting operation is a structure in which everything is performed outside the joint pipe 100. That is, the installation work of the sealing material 210 and the clip 220 is performed outside, and the work of fixing the joint pipe 100 and the pipe 300 in a state where the sealing material 210 and the clip 220 are surrounded by the semicircular cap 230 is also performed outside. In addition, the semicircular cap 230 is also fastened outside the joint pipe 100 by the fastening hole 227 and the bolt 226.

  In other words, the structure in which the connection work is performed outside the joint pipe 100 is a semicircular cap as a subsequent work after the pipe 300 is inserted into the joint pipe 100 through the sealing material 210 and the center of the clip 220. 230 fastening work remains. Such a subsequent operation is not simple in structure and thus delays the construction period of the connection work, which causes the problem that the connection work is inefficient and uneconomical, and the fastening work is performed outside the joint pipe 100. Therefore, there is a problem that a separate external work space is required in addition to the excavation space.

  In addition, since the pipe 300 is not directly fixed to the joint pipe 100 even if the pipe 300 is inserted into the joint pipe 100, the two-touch fixing system cannot be fixed without other subsequent operations. Therefore, there is a problem that the connection work is not easy, because the connection work is not completed once.

  Next, a reinforcing structure of Korean Patent No. 10-1166228 (hereinafter referred to as “prior art 2”) will be described.

  The rubber packing 30 and the fixing cap 40 are installed at the joint 20 of the joint pipe in the “prior art 2”. In this state, the drain pipe 10 is drawn into the joint 20 of the joint pipe. When the drain pipe 10 is retracted, the drain pipe 10 has already passed through the central portions of the rubber packing 30 and the fixed cap 40 (see FIGS. 2a, 2b, and 2c). Even if the drain pipe 10 is drawn into the connecting portion 20, the drain pipe 10 is not directly fixed to the connecting portion 20. Subsequent work is absolutely necessary for fixing. This is because the fixing work is an external structure performed outside the joint pipe. The problem of the external structure of the “prior art 2” in which the fixing work is performed outside the joint pipe is the two-touch fixing method that is a fundamental problem of the external structure. It is the same as the problem revealed in '.

  On the other hand, when the pressure of the pressure pipe is very strong, reinforcement is required between the joint pipe and the drain pipe 10. In the case of the external structure method as in “Prior Art 1” and “Prior Art 2”, further reinforcement is required between the joint pipe and the drain pipe 10. As an example, Korean Registered Patent No. 10-0775411 (hereinafter referred to as “Prior Art 3”) has been proposed.

  As shown in FIG. 3 a, the transfer pipe 10 and the transfer pipe 10 formed with the coupling blade support member 26 face each other so that both the transfer pipes 10 are connected to the coupling structure 30 and the coupling blade support member 26. In this configuration, the fastening member 40 inserted and fixed in the fastening hole 261 is firmly fixed. In other words, it is normal that the coupling structure 30 alone supports and supports the pressure of both transfer pipes 10, but when the pressure of the transfer pipe 10 increases to a high pressure, only the coupling structure 30 supports it. There is a shortage. In order to reinforce this, the coupling blade supporting member 26 is integrally formed on both the transfer pipes 10 and is again supported by the fastening member 40 to reinforce the insufficient supporting force. .

  When high pressure is applied to the transfer pipe 10, the reinforcement to the fixing of the transfer pipe 10 is due to the external structure, even though it is desirable to reinforce it as in “Prior Art 3”. If the reinforcement is based on the external structure, it is not a one-touch fixing method as described above, and thus has the same problem as the fundamental problem of the external structure. When the “joint pipe” has a curved shape such as an L shape or a T shape, a higher pressure is applied to the “joint pipe” than in the single letter shape. If a strong high pressure is applied to the “joint pipe”, the high pressure is applied to the assembly part where the “joint pipe” and the drain pipe are assembled. At this time, when the drain pipe is fixed to the “joint pipe” by an external structure, the drain pipe is more easily detached from the “joint pipe”. This is because the external structure is simply a fastening / fixing structure using bolts for fixing the drain pipe to the “joint pipe”.

  In particular, when water (fluid) is first passed through the pressure pipe, the impact of water (fluid) at the moment when water suddenly passes in addition to the pressure from the normal water (fluid) flow is applied to the “joint pipe”. Will join. The pressure applied to the “joint pipe” is maximized while the impact energy of water (fluid) is applied. The impact energy of the added water (fluid) may not only cause the drain pipe to be detached from the “joint pipe” but also cause a problem of water leakage.

  In addition, the fastening structure of the prior art is performed by an external structure, so that the fastening structure is complicated, and the number of parts (bolts, nuts, flange clamps, welding, etc.) is large, and the construction period of the pipe joint work becomes long. is there.

  Since the fastening and fixing according to the prior art is based on the external structure, the operator must perform joint and fixing work one by one. Therefore, a separate work space is required and the excavation space must be excavated wider than the diameter of the water supply pipe. Not only that, but workers have to enter the work space to perform joints and fixing work, so industrial disasters frequently occur due to landslides.

  (A) In the present invention, the “fixed structure” formed in the pressure tube insertion / contact portion A and the bushing insertion / contact portion D, the “double frictional resistance structure” by the fastener 20, and the watertight rubber packing By forming an organic fastening structure consisting of a 'watertight structure' inside the joint pipe for pressure pipe connection, the fitting and fixing can be completed by only one operation of pushing the pressure pipe into the joint pipe for pressure pipe connection. The purpose is to be a fastening structure of

  (B) The one-touch type fastening structure is a structure provided inside the joint pipe for pressure pipe connection, which is different from the conventional technology installed outside, and the structure is simple and the inside / outside. The elastic projecting part of the tube firmly tightens and secures the pressure tube and does not cause water leakage. At the same time, the pressure tube insertion equipment enables one-touch coupling and fixing, eliminating the need for the operator to perform direct coupling work. Therefore, another purpose is that the drilling work is efficient and economical without requiring a separate work drilling space,

  (C) It is still another object to reduce the work period since the joint / fixing of the fastening structure is easily performed by the one-touch method, so that the joint / connection of the pressure pipe is efficient.

  The structure of the one-touch three-stage fastening device for the pressure pipe coupling joint pipe of the present invention will be described.

  The insertion part S of the joint pipe J for connecting the pressure pipe into which the pressure pipe 50 is inserted in the pressure pipe joint pipe of the one-letter type, L type, T type or the like having an insertion part into which the pressure pipe is inserted / connected is a pressure pipe. The insertion / contact portion A is the starting point, and the fastener insertion / contact portion B, watertight rubber packing insertion / contact portion C, bushing insertion / contact portion D, and the diameter of the insertion portion S starts from the pressure tube insertion / contact portion A. A fastener 20 inserted into the fastener insertion / contact portion B, a watertight rubber packing 30 inserted into the watertight rubber packing insertion / contact portion C, The fastening device 10 is formed by the bushing 40 inserted into the bushing insertion / contact portion D, and the inner elastic protruding portion 22a and the outer elastic protruding portion 22b are arranged on the fastener 20 at regular intervals. The pressure tube 50 corresponding to the position of the inner elastic protrusion 22a is formed with several locking grooves 52 having an inclination angle in the same direction as the inner elastic protrusion 22a, and the outer elastic protrusion 22b. The fastener insertion / contact portion B corresponding to the position is formed with a locking groove B2 having an inclination angle in the same direction as the outer elastic protrusion 22b, and the locking groove 52 of the pressure tube 50 is the pressure tube 50. It has a shape that does not obstruct the insertion of the pressure tube, and resists the detachment of the pressure tube 50 under the action of fluid pressure. The locking groove B2 of the fastener insertion / contact portion B is a fastener to the fastener insertion / contact portion B. 20 has a shape that does not interfere with the insertion of the pressure pipe 20, and has a shape that resists detachment of the joint pipe J for connecting the pressure pipe when fluid pressure is applied, and the engagement between the locking groove 52 of the pressure pipe 50 and the fastener insertion / contact portion B Inner elastic protrusion 2 in stop groove B2 a one-touch three-fastening of a joint pipe for pressure pipe connection, which is configured to resist detachment of the pressure pipe 50 by a double frictional resistance structure formed by inserting a and an outer elastic protrusion 22b. Device.

  Further, the inclination angle θ of the inner elastic protrusion 22a and the outer elastic protrusion 22b is the same as the inclination angle θ of the locking groove 52 of the pressure tube 50 and the locking groove B2 of the fastener insertion / contact portion B. It is the structure formed in this way.

  The shape of the locking groove 52 of the pressure tube 50 and the locking groove B2 of the fastener insertion / contact portion B is a right triangle having an inclination angle θ. As shown in FIG. 7, the locking groove 52 and the locking groove B <b> 2 are formed in directions opposite to each other with the inclination angle θ as a reference with a vertical line having a right triangle.

  The fastener 20 is stainless steel having an elastic material, and the inner elastic protrusion 22a and the outer elastic protrusion 22b are integrally formed by punching the fastener 20, and the inner elastic protrusion 22a and the outer elastic protrusion 22 are integrally formed. The inclination angle θ of 22b is 15 to 30 °.

  The inner elastic protrusion 22a and the outer elastic protrusion 22b have a quadrangular shape or a ladder shape, and a locking groove 52 of the pressure tube 50 formed at a position corresponding to the inner elastic protrusion 22a and the outer elastic protrusion 22b. The inclination angle θ of the locking groove B2 of the fastener insertion / contact portion B is preferably 15 to 30 °.

  The inner elastic protruding portion 22a and the outer elastic protruding portion 22b share the punching portion 226 while protruding from both ends with the punching portion 226 interposed therebetween, and have a structure that is not hindered against elastic reduction at all.

  The both sides 222 of the inner elastic protrusion 22a and the outer elastic protrusion 22b are formed with a turn-up preventing reinforcement 222a inclined in the opposite direction of the inserted pressure tube 50 in the length direction.

  A V-shaped overturn prevention reinforcing portion 224 having a V-shaped apex located on the pressure tube 50 side is formed at the center of the inner elastic protrusion 22a and the outer elastic protrusion 22b.

  The joint pipe J for connecting a pressure pipe of the present invention is a joint pipe that joints and connects the pressure pipes 50. Here, the pressure pipe 50 includes both steel pipes such as ferrous and non-ferrous metals, and synthetic resin pipes. Since the pressure pipe connecting joint pipe J is a member that receives a strong pressure, a solid material such as ferrous and non-ferrous metal is desirable.

  However, the size of the pressure pipe 50 inserted into the 'pressure pipe coupling joint pipe J' varies. Usually, the diameter of the pressure tube 50 is in a wide range from 15 to 3000 mm. Since the strength of the water pressure varies depending on the size of the diameter, the synthetic resin (PE, PP, PVC, etc.) material is also useful as the material of the “coupling joint J”.

  The pressure pipe 50 is inserted and fixed through the insertion portion S of the “pressure pipe coupling joint J”. The order in which the pressure tube 50 is inserted into the insertion portion S is in the order of bushing insertion / contact portion D → watertight rubber packing insertion / contact portion C → fastener insertion / contact portion B → pressure tube insertion / contact portion A.

  Further, the bushing 40 is attached and fixed to the bushing insertion / contact portion D, the watertight rubber packing 30 is attached to the watertight rubber packing insertion / contact portion C, and the fastener 20 is fixed to the fastener insertion / contact portion B.

  The pressure pipe 50 has a structure that penetrates the bushing 40 → the watertight rubber packing 30 → the fastener 20.

  Next, the functions and roles of the pressure tube insertion / contact portion A, the fastener 20, the watertight rubber packing 30, and the bushing 40 in relation to the pressure tube 50 will be described as follows.

  First, the function of the pressure tube insertion / contact portion A will be described.

  The pressure tube insertion / contact portion A serves to firmly contact and fix one side end portion of the pressure tube 50. This is because the pressure pipe 50 prevents horizontal slip and vertical flow due to external factors such as earthquakes and internal factors such as water pressure. The pressure tube insertion / contact portion A is fixed in a balanced "fixed structure" which is balanced with the bushing insertion / contact portion D fixed by the symmetric bushing 40. The 'fixed structure' is a structure that suppresses horizontal slip and vertical flow of the pressure pipe 50.

  The pressure tube insertion / contact portion A is fixed by making the outer diameter of the pressure tube 50 closely contact the inner diameter of the pressure tube insertion / contact portion A.

  The inner diameter of the pressure tube insertion / contact portion A is the same as the outer diameter of the pressure tube 50, and the step of the pressure tube insertion / contact portion A is the same as the thickness t of the pressure tube 50.

  However, if the inner diameter of the pressure tube insertion / contact portion A and the outer diameter of the pressure tube 50 are the same, the pressure tube 50 cannot be inserted. Here, that the size is the same means that a minimum margin that allows the pressure tube 50 to be inserted is included.

  Second, the structure of the fastener 20 inserted into the fastener insertion / contact portion B and the role and function thereof will be described.

  The fastener 20 is inserted into the fastener insertion / contact portion B, and the pressure pipe 50 penetrates the fastener 20.

  More specifically, the outer diameter of the fastener 20 is in close contact with the inner diameter of the fastener insertion / contact portion B, and the outer diameter of the pressure tube 50 is inserted into the inner diameter of the fastener 20. State.

  The material of the fastener 20 is a metal material such as stainless steel having elasticity. The shape of the fastener 20 is a circular ring shape having a certain width. A plurality of inner elastic protrusions 22a and outer elastic protrusions 22b are formed on the circular ring of the fastener 20 in rows at regular intervals. The inner elastic protrusion 22a and the outer elastic protrusion 22b are integrally formed while being punched by the fastener 20 and having a protrusion inclination angle.

  The inner elastic protrusion 22a and the outer elastic protrusion 22b are inclined in opposite directions. The inclination angle θ is the same. The inclination angle θ is preferably 15 to 30 ° with respect to the horizontal plane. The inner elastic protrusion 22a is inclined in the inner direction toward the pressure tube 50 and in the direction in which the pressure tube 50 is inserted, and the outer elastic protrusion 22b is inclined toward the fastener insertion / contact portion B. It is inclined in the direction opposite to the direction in which the pressure tube 50 is inserted.

  The inner elastic protrusion 22a and the outer elastic protrusion 22b can be arranged on the ring of the fastener 20 in various forms. For example, the inner elastic protrusions 22a and the outer elastic protrusions 22b can be alternately arranged in a row on the ring of the fastener 20 as shown in FIG. 4A, as shown in FIG. The inner elastic protrusions 22a and the outer elastic protrusions 22b can be arranged in a plurality of rows as a pair. The elastic protrusion 22 is not only elastically / contracted and elastic / reconstructed (enlarged) quickly at an inclination angle θ15 to 30 °, but also the frictional resistance of the elastic protrusion 22 to the pressure tube 50 at an inclination angle θ15 to 30 °. This is because the strength works most greatly. At this time, if the inclination angle θ is smaller than 15 °, the frictional resistance strength is reduced, and if it is larger than 30 °, the frictional resistance strength is easily reduced by turning over.

  Here, in order to further increase the frictional resistance strength against the pressure tube 50, both side surface portions 222 of the elastic protrusion 22 are provided with an anti-reverse reinforcing portion 222 a inclined in the opposite direction of the inserted pressure tube 50, and the elastic protrusion 22. A V-shaped inside-out prevention reinforcing portion 224 having a V-shaped apex located on the pressure tube 50 side is formed in the length direction of the central portion.

  The inside-out prevention reinforcing portion 222a and the V-shaped inside-out prevention reinforcing portion 224 have a function of not only turning over against frictional resistance but also greatly increasing the frictional resistance support strength.

  The shape of the elastic protrusion 22 is desirably a quadrangular shape or a trapezoidal shape in which the tip contact surface portion of the elastic protrusion 22 is large. This is because the main function of the elastic protruding portion 22 is to increase the frictional resistance due to the tip contact surface portion of the elastic protruding portion 22. However, the shape of the elastic protrusion 22 is not limited to a square shape or a ladder shape. It goes without saying that any shape is included in the quadrangular or trapezoidal shape as long as the tip contact surface portion of the elastic protrusion 22 is large.

  Next, a description will be given of the friction resistance structure by the protruding inclination directions of the inner elastic protrusion 22a and the outer elastic protrusion 22b and the locking grooves 52 and B2 of the pressure tube 50 and the fastener insertion / contact portion B. It is.

  First, the frictional resistance structure by the inner elastic protrusion 22a and the locking groove 52 of the pressure tube 50 will be described.

  The inner elastic protrusion 22a is inclined in the inner direction toward the pressure tube 50 and in the direction in which the pressure tube 50 is inserted. Since the inner elastic protrusion 22a is inclined in the direction in which the pressure tube 50 is inserted, the insertion of the pressure tube 50 is not hindered at all. In other words, when the pressure tube 50 is inserted into the inner diameter of the fastener 20, the inner elastic protrusion 22 a that is in contact with the outer peripheral surface of the pressure tube 50 is pushed toward the punching portion 226 while being pressed by the outer peripheral surface of the pressure tube 50. It will be elastic and contracted. The insertion and insertion of the pressure tube 50 are not hindered by the elasticity and contraction of the inner elastic protrusion 22a, so that the insertion is smooth.

  A locking groove 52 is formed on the outer peripheral surface of the pressure tube 50 at a position corresponding to the inner elastic protrusion 22a. The state where the inner elastic protrusion 22a is inserted into the locking groove 52 of the pressure tube 50 is a state where the insertion of the pressure tube 50 is completed. If a force for separating the pressure tube 50 in the direction opposite to that at the time of insertion is applied in this state, the inner elastic protrusion 22a has a frictional resistance structure with respect to the locking groove 52 of the pressure tube 50. The frictional resistance structure is a structure opposite to that when the pressure pipe 50 is inserted.

  Even if the inner elastic protrusion 22a is elastically / shrinked by the outer peripheral surface of the pressure tube 50, if a force in the opposite direction to separate the pressure tube 50 is applied, the elastic / contracted inner elastic protrusion 22a is applied. The restoring force to be restored / expanded in the original protruding inclination direction will be demonstrated. A strong frictional resistance structure is formed by the interaction between the restoring force of the inner elastic protrusion 22 a and the locking groove 52 of the pressure tube 50.

  The inner elastic protrusion 22a has a structure that is elastic and contracted in the insertion direction of the pressure tube 50, and a frictional resistance that is elastic and enlarged by exerting an elastic restoring force in the separation and separation direction of the pressure tube 50. Structure.

  In the friction resistance structure, the friction resistance increases as the number of the elastic protrusions 22 increases.

  The number of elastic protrusions 22 formed on the circular fastener 20 is a design matter determined by the diameter of the pressure tube 50.

  A plurality of rows are formed at regular intervals while forming a plurality of rows.

  Next, the frictional resistance structure by the outer elastic protrusion 22b and the engaging groove B2 of the fastener insertion / contact portion B will be described.

  The fastener insertion / contact portion B corresponding to the position of the outer elastic protrusion 22b is formed with a locking groove B2 having an inclination angle in the same direction as the outer elastic protrusion 22b.

  The outer elastic protruding portion 22b is smoothly inserted into the engaging groove B2 of the fastener insertion / contact portion B with an inclination angle in the same direction.

  The frictional resistance structure by the outer elastic protrusion 22b and the engaging groove B2 of the fastener insertion / contact portion B will be described with reference to FIG.

  Water flows from (a) to (b). In FIG. 8B, the outer elastic protrusion 22b is inclined and inserted in the fastener insertion / contact portion B in the water flow direction.

  In the case of (b), the pressure pipe coupling joint pipe J is in a fixed state, and the pressure pipe 50b is relatively detached in the water flow direction. This is because such a phenomenon actually occurs in the 'pressure pipe coupling joint pipe J' and the pressure pipe 50b.

  In the case of (b), a frictional resistance structure is formed by the inner elastic protrusion 22a and the pressure tube 50b. That is, when the pressure tube 50b is about to be separated by water pressure, the inner elastic protrusion 22a is frictionally resisting the locking groove 52 of the pressure tube 50.

  If the water pressure acting on the pressure pipe 50b is increased, the frictional resistance caused by the locking groove 52 and the inner elastic protrusion 22a of the pressure pipe 50b will eventually be integrated into the inner elastic protrusion 22a and the outer elastic protrusion 22b. It acts on the formed fastener 20 and comes to release the fastener 20 in the direction of water flow. In order to reinforce this, a friction resistance structure is formed by the outer elastic protrusion 22b and the locking groove B2, so that it can resist a strong water pressure together with a friction resistance structure by the inner elastic protrusion 22a and the pressure tube 50b. .

  On the other hand, the case (a) is a state in which the pressure pipe 50a is fixed, and the 'pressure pipe coupling joint pipe J' is relatively disengaged in the water flow direction. In the case of (a), a friction resistance structure is formed by the locking groove 52 of the pressure tube 50 and the inner elastic protrusion 22a. That is, the inner elastic protrusion 22a is in frictional resistance with respect to the locking groove 52 of the pressure pipe 50 when the ‘pressure pipe coupling joint pipe J’ is about to be detached by water pressure.

  If the water pressure acting on the “pressure pipe coupling joint J” becomes large, the frictional resistance due to the locking groove 52 and the inner elastic protrusion 22a of the pressure pipe 50a eventually becomes the inner elastic protrusion 22a and the outer elastic protrusion. The portion 22b acts on the integrally formed fastener 20, and the fastener 20 is detached in the water flow direction. In order to reinforce this, a friction resistance structure is formed by the outer elastic protrusion 22b and the locking groove B2, so that it can resist a strong water pressure together with a friction resistance structure by the inner elastic protrusion 22a and the pressure tube 50b. .

  Third, the role and function of the watertight rubber packing 30 inserted into the watertight rubber packing insertion / contact portion C will be described.

  The watertight rubber packing 30 is in close contact with the watertight rubber packing insertion / contact portion C.

  The outer diameter of the watertight rubber packing 30 is in close contact with the inner diameter of the watertight rubber packing insertion / contact portion C, and the inner diameter of the watertight rubber packing 30 is in close contact with the outer diameter of the pressure tube 50. The watertight rubber packing 30 serves to prevent water leakage. The watertight rubber packing 30 uses the structure and shape used conventionally.

  However, a one-touch type joint is formed by forming a structure in which a fastener insertion / contact part B is formed inside the watertight rubber packing insertion / contact part C and a bushing insertion / contact part D is formed on the outside thereof.・ It is very different from the structure of the prior art because it can be fixed.

  The upper protrusion 32 of the watertight rubber packing 30 is inserted and fixed to the semicircular protrusion C1 of the watertight rubber packing insertion / contact portion C.

  The lower horizontal protrusion 34 of the watertight rubber packing 30 is extended and provided to the lower part of the fastener 20.

  Fourth, the role and function of the bushing 40 inserted into the bushing insertion / contact portion D will be described.

  The bushing 40 is closely attached and fixed to the bushing insertion / contact part D.

  The bushing 40 has a vertical insertion preventing jaw 42, a horizontal outer diameter 44 and an inner diameter 46.

  The inner diameter 46 of the bushing 40 is in close contact with the outer diameter of the pressure tube 50 while the outer diameter 44 of the bushing 40 is in close contact with the inner diameter of the bushing insertion / contact portion D.

  The bushing 40 is a member that is inserted between the inner diameter of the bushing insertion / contact portion D and the outer diameter of the pressure tube 50 to firmly fix the pressure tube 50 to the bushing insertion / contact portion D.

  The material of the bushing 40 is preferably the same material as that of the 'pressure pipe coupling joint J'. This is for further strengthening the fixing force in the section of the bushing insertion / contact portion D by insertion of the bushing 40.

  There are two places where the pressure pipe 50 inserted into the 'pressure pipe coupling joint pipe J' is fixed. The two places are symmetrical with each other. The pressure tube 50 forms a stable 'fixed structure' by two symmetrically fixed positions.

  The fixing at one point is the fixing of the bushing insertion / contact part D by the bushing 40, and the fixing at the other part is the insertion of the pressure tube / fixing part A.

  If the “fixed structure” of the pressure tube 50 is first stabilized, the frictional resistance structure by the fastener 20 is stabilized, and at the same time, the watertight structure by the watertight rubber packing 30 is stabilized.

  A strong water pressure acts on the 'pressure pipe coupling joint pipe J' in which the pressure pipe 50 is assembled.

  The strong water pressure causes (1) the pressure pipe 50 or the “pressure pipe coupling joint pipe J” to be detached in the direction of the water pressure, and (2) generates vibration to cause the pressure pipe 50 or the “pressure pipe coupling”. The detachment of the joint pipe J ′ for use will be weighted.

  The 'pressure pipe coupling joint pipe J' and the pressure pipe 50 are in a relative relationship. That is, from the viewpoint that the 'pressure pipe coupling joint pipe J' is fixed, the pressure pipe 50 is relatively detached by water pressure. On the contrary, from the viewpoint that the pressure pipe 50 is fixed, the 'pressure pipe coupling joint pipe J' is relatively disengaged. This is a phenomenon that actually occurs.

  'Pressure tube coupling joint J' has a stable 'fixed structure' by pressure tube insertion / contact portion A and bushing insertion / contact portion D, and double friction resistance by inner elastic protrusion 22a and outer elastic protrusion 22b. It is an organic resistance structure consisting of a structure and a watertight structure with watertight rubber packing. The organic resistance structure suppresses and resists the separation and vibration of the pressure tube 50. In particular, the “fixed structure” of the pressure tube 50 is a basic structure that is a premise of a double friction resistance structure and a watertight structure.

  This is because if the “fixed structure” of the pressure tube 50 is not stable, the separation preventing function by the frictional resistance structure and the watertight function by the watertight structure cannot be performed well.

  Earthquakes are the largest vibration factor. Also, sudden changes in fluid flow are factors that increase vibration and water pressure. The sudden change in the fluid flow is, for example, a case where the curve section suddenly becomes an urgent curve section. This includes a case where it fits an urgent curved joint pipe such as an L shape or a T shape, or a case where impact energy of water is generated due to sudden water flow.

  Next, the basic concept of the one-touch three-stage fastening according to the present invention will be described based on the above description.

  The 'pressure pipe coupling joint pipe J' of the present invention is an organic resistance structure formed by a fixed structure, a double friction resistance structure, and a watertight structure.

  The basic concept of the one-touch three-stage fastening is a one-touch system in which the joint fixing of the pressure pipe 50 is completed as long as the pressure pipe 50 is pushed into the “pressure pipe coupling joint pipe J” formed with the organic resistance structure. .

  The first stage is the bushing insertion / contact part D and the watertight rubber packing insertion / contact part C, the second stage is the fastener insertion / contact part B, and the third stage is the pressure tube insertion / contact part A. .

  The one-touch system is easy for on-site coupling and fixing. This is because the joint fixing of the pressure pipe 50 is completed as long as the pressure pipe 50 is pushed into the “pressure pipe coupling joint pipe J” formed with the organic resistance structure by the pressure pipe insertion equipment.

  (A) Since the present invention has a structure in which an organic resistance structure by a fixed structure, a double friction resistance structure, and a watertight structure is formed inside the pressure pipe connection joint pipe, One-touch type fitting and fixing is completed with just one operation to push the pressure pipe, so that not only the fitting and connecting work is easy, but also the work period is shortened and the work is efficient and economical. .

  (B) Unlike the conventional technology installed outside, the one-touch double organic friction resistance structure is a structure provided inside the joint pipe for pressure pipe connection, and the structure is simple. In addition, the pressure tube is firmly fixed and fixed so that no water leakage occurs. At the same time, the pressure tube insertion equipment enables one-touch coupling and fixing, so there is no need for the operator to perform direct coupling work. There is no need for a work excavation space, the excavation work is efficient and economical, and it is possible to perform joint work with equipment even if an operator does not enter the work space, thereby preventing industrial disasters caused by sediment collapse.

  (C) Since it is a simple fastening structure based on the one-touch method, it is a useful invention having the effect of facilitating the joint and connection work of the pressure pipe, making the joint and work efficient, and shortening the working machine.

It is a schematic sectional drawing of the joint pipe of prior art 1. It is sectional drawing which shows the state by which the coupling tool of the external structure was fastened by the joint pipe | tube of the prior art 1. FIG. It is a separation perspective view of the clip of prior art 1. It is the perspective view which showed the joint pipe for T-shaped drainage pipe connection of the prior art 2. FIG. It is the isolation | separation figure which showed the cross-sectional state of the joint pipe for T-shaped drainage pipe connection of the prior art 2. FIG. It is the state figure by which the drainage pipe was connected with the joint pipe for T character type drainage pipe connection of conventional technology 2. It is the exploded sectional view showing the state where the coupling structure was combined with the transfer piping joint structure of prior art 3. It is the coupling | bonding state figure which showed the state which couple | bonded the coupling structure with the transfer piping coupling | bonding structure of the prior art 3. FIG. It is a disassembled perspective view of the one-touch 3 step | paragraph fastening apparatus of the joint pipe for pressure pipe connection of this invention. It is AA sectional drawing of FIG. It is a perspective view of the fastener of the joint pipe for pressure pipe connection of the present invention. FIG. 5 is a cross-sectional view of FIG. It is sectional drawing for description of the basic concept of the one-touch three-step fastening of this invention.

  The construction method of the pressure pipe using the one-touch three-stage fastening device of the joint pipe for pressure pipe connection of the present invention will be specifically described with reference to the accompanying drawings.

  (A) Although the underground is excavated by the open cut method in order to install the pressure pipe 50, unlike the conventional case, only a minimum space in which the pressure pipe 50 can be installed is provided without excavating a separate work space. Excavating underground in the length direction of the pressure pipe 50;

  (B) Fastener insertion / contact portion B, watertight rubber packing insertion in which a large number of locking grooves B2 having an inclination angle in the same direction as the outer elastic protrusion 22b are sequentially formed starting from the pressure tube insertion / contact portion A The inner elastic protrusion 22a and the outer elastic protrusion 22b each having an inclination angle θ of 15 to 30 ° are constant in the insertion portion S of the pressure pipe coupling joint pipe J composed of the close contact portion C and the bushing insertion and close contact portion D. A plurality of fasteners 20, a watertight rubber packing 30, and a bushing 40 formed in a row at intervals of a plurality of pressure pipe connecting joint pipes J1, J2,. The frictional resistance structure is formed by the outer elastic protrusion 22b of the fastener 20 and the right-angled triangular locking groove B2 of the fastener insertion / contact portion B corresponding thereto. Multiple pressures Connecting joint pipe J1, J2, stage of making a ··· Jn,

  (C) The insertion portion SR of the pressure pipe coupling joint pipe J1 manufactured in the step (b) and a plurality of right-angled triangular locking grooves 52 having the same inclination angle as the inner elastic protrusion 22a. The formed end L of the pressure pipe K1 is positioned so as to match each other, and in this state, the end L of the pressure pipe K1 is pushed into the insertion part SR of the joint pipe J1 for connecting the pressure pipe by the pressure pipe insertion equipment. , Elastically inserting and fixing the inner elastic protrusion 22a in a plurality of locking grooves 52 formed on the end L side of the pressure tube K1,

  (D) Inserting and connecting the insertion portion SL of the new joint pipe J2 for pressure pipe already manufactured in the step (b) to the end R of the pressure pipe K1 in the step (c), Elastically inserting and fixing the inner elastic protrusion 22a provided in the insertion portion SL of the coupling joint pipe J2 in a number of right-angled triangular locking grooves 52 formed on the end R side of the pressure pipe K1;

  (E) The insertion portion SR of the pressure pipe coupling joint pipe J2 in the step (d) and the end portion L of the new pressure pipe K2 in which a number of locking grooves 52 are formed are positioned in a state where they are aligned with each other. In this state, the end portion L of the pressure tube K2 is pushed into the insertion portion SR of the pressure tube coupling joint tube J2 by the pressure tube insertion equipment, and a plurality of latches formed on the end portion L side of the pressure tube K2. Elastically inserting and fixing the inner elastic protrusion 22a in the groove 52;

  (F) The insertion portion SL of the new pressure pipe coupling joint J3 already assembled in the step (b) is inserted and connected to the end R of the pressure pipe K2 in the step (e), and the step Inserting and fixing in the same manner as in (d),

  (G) A step of sequentially coupling and connecting pressure pipe coupling joints J4, J5,... Jn and pressure pipes K3, K4,... Kn while repeating steps (c) to (f). Is a pressure pipe construction method using a one-touch three-stage fastening device for a pressure pipe coupling joint pipe.

  Here, the pressure pipe coupling joint pipes J1, J2,... Jn indicate the joint order of the pressure pipe coupling joint pipes J for convenience of explanation, and the corresponding pressure pipes K1, K2, ... Kn indicates the insertion / joint order of the one-shaped pressure pipe 50 to the joint pipes J1, J2, ... Jn for connecting the pressure pipes.

  For convenience of explanation, L of the pressure pipe K refers to the end of the left pressure pipe connected to the joint pipe J for pressure pipe connection, and R of the pressure pipe K is the right side connected to the joint pipe J for pressure pipe connection. The end of the pressure tube. SR means that the insertion part S of the pressure pipe coupling joint pipe J is located on the right side, and SL means that the insertion part S of the pressure pipe coupling joint pipe J is located on the left side.

  Further, the fastener 20 in the step (b) is stainless steel having an elastic material, and the inner elastic protrusion 22a and the outer elastic protrusion 22b are integrally formed by punching the fastener 20, and the inner elastic protrusion 22a. The outer elastic protrusion 22b has a quadrangular shape or a trapezoidal shape, while the locking groove 52 of the pressure tube 50 has a right triangle formed at a position corresponding to the inner elastic protrusion 22a and the outer elastic protrusion 22b. And the inclination angle θ of the locking groove B2 of the fastener insertion / contact portion B is 15 to 30 °, and the inclination angle θ is formed in opposite directions with respect to a vertical line of a right triangle. It is a construction method of a pressure pipe using a one-touch three-stage fastening device for a pressure pipe coupling joint.

  Further, both side surface portions 222 of the elastic protrusion 22 are provided with a reverse-preventing reinforcing portion 222a inclined toward the pressure tube 50, and a V-shaped apex is positioned at the pressure tube 50 side at the center of the elastic protrusion 22. A pressure pipe construction method using a one-touch three-stage fastening device for a joint pipe for pressure pipe connection, characterized in that a letter-shaped reversal prevention reinforcing portion 224 is formed in the length direction.

  Further, the both sides 222 of the elastic protrusion 22 are provided with an anti-reverse reinforcing portion 222a inclined in the opposite direction of the inserted pressure tube 50, and a V-shaped apex is provided at the center of the elastic protrusion 22 with a pressure tube. A pressure pipe construction method using a one-touch three-stage fastening device for a joint pipe for pressure pipe, wherein a V-shaped inside-out prevention reinforcing portion 224 located on the 50 side is formed in the length direction. .

  Further, the inner elastic protruding portion 22a and the outer elastic protruding portion 22b share the punching portion 226 while protruding from both ends with the punching portion 226 interposed therebetween, and have a structure that does not interfere with the elastic shrinkage at all. It is a construction method of a pressure pipe using a one-touch three-stage fastening device for a joint pipe for pipe connection.

  In this way, after constructing 'pressure pipe coupling joint J' of organic resistance structure with fixed structure, double friction resistance structure and watertight structure, it was excavated to connect and joint this Then, the pressure pipe 50 is aligned with the insertion portion S of the pressure pipe coupling joint pipe J, and in this state, the pressure pipe 50 is pushed into the pressure pipe coupling joint pipe J using the pressure pipe insertion equipment. As a result, the joint fixing of the pressure pipe 50 is completed by the one-touch method.

  The conventional technology in which the fastening and fixing are provided outside has not only a complicated fastening structure but also a large number of parts (bolts, nuts, flange clamps, welding, etc.) and a long working time. Since it is installed inside, the structure can be simplified and one-touch joint fixing becomes possible.

Unlike the prior art, the present invention does not require excavation of a separate work space, and since the joint fixing is a one-touch method with equipment, it is not necessary for the worker to enter the work space. This is a useful invention that does not occur.

Claims (10)

For pressure pipe joint pipes of one-letter type, L type, T type, etc., having an insertion part into which the pressure pipe is inserted / connected,
The insertion portion S of the pressure tube coupling joint pipe J into which the pressure tube 50 is inserted is composed of a fastener insertion, a watertight rubber packing insertion, a bushing insertion, and a close contact portion D in sequence starting from the pressure tube insertion and close contact portion A. ,
The diameter of the insertion portion S is formed into a shape that gradually increases toward the outside starting from the pressure tube insertion / contact portion A, while the fastener 20 inserted into the fastener insertion / contact portion B; The fastening device 10 is constituted by the watertight rubber packing 30 inserted into the watertight rubber packing insertion / contact portion C and the bushing 40 inserted into the bushing insertion / contact portion D,
A plurality of inner elastic protrusions 22a and outer elastic protrusions 22b are formed on the fastener 20 in rows at regular intervals,
The pressure tube 50 corresponding to the position of the inner elastic protrusion 22a has a locking groove 52 having an inclination angle in the same direction as the inner elastic protrusion 22a, and the position corresponding to the position of the outer elastic protrusion 22b. The fastener insertion / contact portion B is formed with a locking groove B2 having an inclination angle in the same direction as the outer elastic protrusion 22b,
The locking groove 52 of the pressure pipe 50 has a shape that is not obstructed when the pressure pipe 50 is inserted, and has a right triangle shape that resists detachment of the pressure pipe 50 when fluid pressure is applied.
The locking groove B2 of the fastener insertion / contact portion B has a shape that is not obstructed when the fastener 20 is inserted into the fastener insertion / contact portion B, and the pressure pipe connection joint pipe J is applied when fluid pressure is applied. It is a right triangle that resists the detachment of
The inner elastic protrusion 22a and the outer elastic protrusion 22b are respectively inserted into the locking groove 52 of the pressure tube 50 and the locking groove B2 of the fastener insertion / contact portion B to form a double friction resistance structure. While resisting detachment of the pressure tube 50,
A one-touch three-stage fastening device for a joint pipe for connecting a pressure pipe.   The inclination angle θ of the inner elastic protrusion 22a and the outer elastic protrusion 22b and the inclination angle θ of the engagement groove 52 of the pressure tube 50 and the engagement groove B2 of the fastener insertion / contact portion B are the same. The one-touch three-stage fastening device for a pressure pipe coupling joint pipe according to claim 1, wherein the one-touch three-stage fastening apparatus is formed as described above.   The fastener 20 is stainless steel having an elastic material, and the inner elastic protrusion 22a and the outer elastic protrusion 22b are integrally formed by punching the fastener 20, and the inner elastic protrusion 22a and the outer elastic protrusion 22a are integrally formed. 3. The one-touch three-stage fastening device for a pressure pipe coupling joint pipe according to claim 1, wherein an inclination angle θ of the elastic protrusion 22 b is 15 to 30 °. The inner elastic protrusion 22a and the outer elastic protrusion 22b have a quadrangular shape or a trapezoidal shape,
The inclination angle θ of the locking groove 52 of the pressure tube 50 and the locking groove B2 of the fastener insertion / contact portion B formed at positions corresponding to the inner elastic protrusion 22a and the outer elastic protrusion 22b is 15; To be ~ 30 °,
In addition, the inclination angle θ of the locking groove 52 of the pressure tube 50 having a right triangle shape and the locking groove B2 of the fastener insertion / contact portion B is formed in opposite directions with respect to the vertical line of the right triangle. The one-touch three-stage fastening device for a pressure pipe coupling joint pipe according to claim 1 or 2. The inner elastic protruding portion 22a and the outer elastic protruding portion 22b protrude from both ends with the punching portion 226 interposed therebetween, and have a structure that does not interfere with the elastic reduction at all while sharing the punching portion 226 with each other.
The one-touch three-stage fastening device for a joint pipe for connecting a pressure pipe according to claim 4.   An inside-out prevention reinforcing portion 222a inclined in the opposite direction to the inserted pressure tube 50 is formed in the length direction on both side surface portions 222 of the inner elastic protrusion portion 22a and the outer elastic protrusion portion 22b. The one-touch three-stage fastening device for a pressure pipe coupling joint pipe according to claim 2.   The center of the inner elastic protrusion 22a and the outer elastic protrusion 22b is formed with a V-shaped overturn prevention reinforcing part 224 having a V-shaped apex located on the pressure tube 50 side. Item 7. A one-touch three-stage fastening device for a joint tube for connecting a pressure tube according to Item 6. (A) In order to install the pressure pipe 50, the underground is excavated by an open cut method, and unlike the conventional case, only the minimum space in which the pressure pipe 50 can be installed is provided without excavating a separate work space. Excavating underground in the length direction of the pressure pipe 50;
(B) Fastener insertion / contact portion B, watertight rubber packing insertion in which a large number of locking grooves B2 having an inclination angle in the same direction as the outer elastic protrusion 22b are sequentially formed starting from the pressure tube insertion / contact portion A A fastener 20, a watertight rubber packing 30, and a bushing 40 are sequentially inserted and fixed in an insertion portion S of a pressure pipe coupling joint pipe J composed of a close contact portion C, a bushing insertion and a close contact portion D. Insertion and fixing of the fastener 20 in which a plurality of inner elastic protrusions 22a and outer elastic protrusions 22b having an inclination angle θ of 30 ° are formed in rows at regular intervals is performed by the outer elastic protrusions. A resistance structure that resists detachment of the pressure pipe 50 during fluid pressure action by elastically inserting and fixing the portion 22b in the right-angled triangular locking groove B2 of the fastener insertion / contact portion B corresponding thereto. The pressure Steps for assembling and installing pipe joints J1, J2, J3, ... Jn,
(C) A number of right-angled triangular locking grooves 52 having an inclination angle in the same direction as the insertion portion SR of the pressure pipe coupling joint tube J1 manufactured in the step (b) and the inner elastic protrusion 22a. The end portion L of the pressure pipe K1 formed with is positioned in a state where they are aligned with each other, and in this state, the end portion L of the pressure pipe K1 is inserted into the insertion portion SR of the joint pipe J1 for connecting the pressure pipe. Pushing, and allowing the inner elastic protrusions 22a to be elastically inserted and fixed in the plurality of locking grooves 52 formed on the end L side of the pressure tube K1,
(D) Insert and connect the insertion portion SL of the new pressure pipe coupling joint pipe J2 already assembled in the step (b) to the end R of the pressure pipe K1 in the step (c), The inner elastic protrusion 22a provided in the insertion portion SL of the pressure pipe coupling joint pipe J2 is elastically inserted into the plurality of right-angled triangular locking grooves 52 formed on the end R side of the pressure pipe K1.・ Stage to fix,
(E) The insertion portion SR of the pressure pipe coupling joint pipe J2 in the step (d) and the end portion L of the new pressure pipe K2 in which a large number of the locking grooves 52 are formed are positioned in a state of being aligned with each other. In this state, the end portion L of the pressure tube K2 is pushed into the insertion portion SR of the joint tube J2 for connecting the pressure tube by the pressure tube insertion equipment, and a plurality of portions formed on the end portion L side of the pressure tube K2 are pushed. The inner elastic protrusion 22a is elastically inserted and fixed in the locking groove 52;
(F) Insert and connect the insertion portion SL of the new pressure pipe coupling joint pipe J3 already assembled in the step (b) to the end R of the pressure pipe K2 in the step (e), A step of inserting and fixing in the same manner as in step (d); and (g) pressure pipe coupling joints J4, J5,... Jn while repeating steps (c) to (f). And pressure pipes K3, K4,... Kn are sequentially joined and connected, and a pressure pipe construction method using a one-touch three-stage fastening device for a joint pipe for pressure pipe connection.   The fastener 20 in the step (b) is stainless steel having an elastic material, and the inner elastic protrusion 22a and the outer elastic protrusion 22b are integrally formed by punching the fastener 20, and the inner elastic protrusion The pressure tube having a right triangular shape formed at a position corresponding to the inner elastic protrusion 22a and the outer elastic protrusion 22b, while the shape of the portion 22a and the outer elastic protrusion 22b is a square shape or a ladder shape. The inclination angle θ of the 50 engaging grooves 52 and the engaging groove B2 of the fastener insertion / contact portion B is 15 to 30 °, and the inclination angles θ are formed in opposite directions with respect to a vertical line of a right triangle. A pressure pipe construction method using the one-touch three-stage fastening device for a pressure pipe coupling joint pipe according to claim 8. The inner elastic protrusion 22a and the outer elastic protrusion 22b protrude from both ends with a punching portion 226 interposed therebetween, and have a structure in which the punching portion 226 is shared and is not obstructed at all with respect to elastic reduction. The construction method of the pressure pipe using the one-touch three-stage fastening apparatus of the joint pipe for pressure pipe connection of Claim 8 or 9.

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