KR101856507B1 - Connecting structure for pipe - Google Patents

Abstract

The present invention provides a pipe connecting structure, comprising: a first pipe having an insertion pipe; a second pipe having a socket inserted with the insertion pipe; a sealing member inserted between the socket and the insertion pipe; a grip ring fitted to the outer circumference of the insertion pipe, gripping the insertion pipe when being contracted, and having a taper surface on the outer circumference thereof; a pressure ring fitted to the outer circumference of the insertion pipe, and having a pressing surface for pressing the sealing member in an insertion direction and a taper surface corresponding to the taper surface of the grip ring; a first pressing tool for accessing the socket with the pressure ring such that the sealing member can be pressed by a pressing surface; and a second pressing tool for bringing the taper surface of the pressure ring in contact with the taper surface of the grip ring such that the grip ring can be contracted.

Description

CONNECTING STRUCTURE FOR PIPE < RTI ID = 0.0 >

Embodiments of the invention relate to structures used to connect tubes together.

Pipes for the purpose of transporting fluids (or powders, etc.) such as water, sewage, gas and crude oil, steel pipes, cast iron pipes iron pipe, synthetic resin pipe and so on.

In such a tube, an insertion tube (a mouthpiece) of the other tube is inserted into a socket of a tube of either of the two tubes to be mutually connected, and a ring-shaped sealing member a sealing member, a rubber ring) is inserted, and then the inserted sealing member is pressed by the pressure wheel, and the pressure wheel and the socket are tightened with bolts to maintain the pressurized state of the pressure against the sealing member .

In the case of the pipe connection structure using the existing mechanical joint, since the bolts are broken and the pipe is separated due to the action of strong external force, the pipes are separated from each other only by the fastening force of the bolts tightening the coils and the socket. There is a problem that the connection of the pipe becomes unstable or is released.

In addition, although a type in which a means for preventing the tube from departing is proposed, the problem of complicating the structure of the tube departure prevention means is that it is difficult to apply the manufactured tube release prevention means by manufacturing the tube departure prevention means have.

In addition, a female thread is provided on the pressure roll for the purpose of fixing the position of the pressure roll, or applying a tube deviation preventing means or the like to the pressure roll, and a separate process for preparing a female thread when casting the pressure roll is added .

Korean Registered Patent No. 10-0987014 (October 11, 2010) Korean Registered Patent No. 10-1037586 (May 28, 2011)

It is an object of the present invention to provide a pipe connection structure which can be expected to have a further improved effect of preventing pipe departure.

An embodiment of the present invention has another purpose to provide a tube connection structure that is simple in structure and easy to manufacture.

The problems to be solved are not limited thereto, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a first tube having an insertion tube at least at one end thereof; A second tube provided with a socket into which the insertion tube is inserted at least one end thereof and a joint end having an enlarged inner circumference at the tip of the socket; A sealing member inserted between the insertion tube inserted into the socket and the joint end; A grip ring (grip), which is fitted on the outer periphery of the insertion tube and is configured to grip the insertion tube in a shrinkable and contractible state and has a taper face formed on its outer periphery to enlarge the outer periphery toward the insertion direction of the insertion tube ring; A pressure wheel fitted to an outer periphery of the insertion tube and having a taper surface corresponding to a taper surface of the grip ring and a pressing surface for pressing the sealing member in the insertion direction; A first pressing mechanism that approaches the socket and the roller so that the sealing member is pressed by the pressing surface; And a second pressing mechanism for bringing the tapered surface of the grip ring into close contact with the tapered surface of the pressure ring so that the grip ring is contracted.

Wherein the first pressing mechanism includes a plurality of first bolts provided with hooks on the head and a plurality of first nuts respectively coupled with the first bolts, And a first through hole through which the first bolts having the latching jaws are respectively passed are formed in the socket jaws, and the first nuts are engaged with the socket jaws, The through holes are coupled with the first bolts passing through the first through holes so that the socket and the pressure ring can be accessed by tightening the first nuts.

Wherein the pressure roll is constituted by a first pressure wheel positioned forward and a second pressure wheel positioned rearward with respect to an insertion direction of the insertion tube, the first pressure wheel having the pressure surface and the first through holes, May have a tapered surface of the roller.

Wherein the second pressing mechanism includes a plurality of second bolts and a plurality of second nuts respectively coupled to the second bolts, and the pressure roller has a configuration divided into the first pressure roller and the second pressure wheel, Wherein the first and second press rolls are formed with communication holes and second through holes that respectively correspond to the second bolts so that the second bolts can pass therethrough respectively, Wherein the second nuts are engaged with the second bolts which have passed through the communication holes and the second through holes which coincide with each other so that the tapered surface of the grip ring and the tapered surface of the second pressure roller 2 The nuts can be tightened by tightening them.

Alternatively, the second pressurizing mechanism may include a plurality of second bolts provided with hooks on the head, and a plurality of second nuts respectively coupled to the second bolts, Wherein the first and second rotatable rollers have a configuration in which the first and second rotatable rollers are divided into two communicating holes which are mutually coincident with each other so that the second bolts, Wherein the first and second rollers have a stop surface in contact with the grip ring and the second nuts are in contact with the communication holes and the second through holes, And the tapered surface of the grip ring and the tapered surface of the second roller can be brought into close contact with each other when the second nuts are tightened.

Alternatively, the second pressurizing mechanism may include a plurality of second bolts provided with hooks on the head, and a plurality of second nuts respectively coupled to the second bolts, Wherein the second ring is formed with a ring-shaped ring in which the engagement rings of the second bolts are engaged with the grip ring, and a second through-hole through which the second bolts, And the second nuts are engaged with the second bolts passing through the second through holes in a state in which the engagement jaw is engaged with the ring tile so that the tapered surface of the grip ring and the tapered surface Can be tightened by tightening the second nuts.

The second pipe is a steel pipe, and the joint end portion has a tapered pipe having an enlarged inner periphery formed in a shape widened outwardly at an end of the socket by expansion; And a socker ring fitted to an outer periphery of the taper pipe and having a tapered surface corresponding to the taper pipe on an inner periphery thereof and the socket jaw formed on an outer periphery thereof.

The grip ring may be formed with an opening portion so as to have a structure that is opened at one side. Alternatively, the grip ring may be composed of a plurality of unit rings arranged along the circumferential direction. Alternatively, the grip ring may have at least one slit that induces shrinkage on at least one of the inner periphery and the outer periphery. Alternatively, the grip ring may be formed with an opening formed to have a structure that has an open structure on one side, and at least one slit that induces shrinkage on at least one of the inner periphery and the outer periphery.

The grip ring having a structure that has one of the projections on one side has at least one spike in the inner circumferential direction on the inner periphery of the grip ring body and has a portion where both ends of the grip ring body meet with the inner circumference, And the portions where they meet can be formed as rounds or slopes, respectively.

Wherein at least one or more spikes are formed in the inner periphery of the unit rings in the inner circumferential direction, and a portion where both ends of the unit rings meet the inner circumference and a portion where both ends of the spikes meet the inner circumference Or may be formed as a round or slant surface.

The tube connection structure according to an embodiment of the present invention may further include grip ring restraining means for restricting movement of the grip ring in the inserting direction of the insertion tube.

The grip ring restraining means may include a clamping band for clamping the grip ring to the insertion tube. Alternatively, the grip ring restraining means may include: a convex portion provided on one of an outer periphery of the insertion tube and an inner periphery of the grip ring; And a recess provided to restrict the movement of the grip ring in the inserting direction of the insertion tube by engaging action of the convex portion with the other one of the outer circumference of the insertion tube and the inner circumference of the grip ring. Alternatively, the grip ring restraining means may include both the clamping band and the convex portion and the concave portion.

The portion of the insertion tube that is gripped by at least the grip ring of the outer surface may be formed of synthetic resin.

At least one of the insertion tube, the socket, and the grip ring may include a carbon composite material.

The pipe connection structure according to the embodiment of the present invention in which the pressure roller is divided into the first pressure roller and the second pressure roller is characterized in that the pipe connection structure of the present invention protrudes from the first pressure roller toward the second pressure roller, And a holder for restricting the movement of the second roller by temporarily coupling the first roller with the second roller.

Means for solving the problems will be more specifically and clarified through the embodiments, drawings, and the like described below. In addition, various solution means other than the above-mentioned solution means may be further proposed.

According to the embodiment of the present invention, it is possible to surely prevent the tube from being separated by a simple and simple structure, and to easily manufacture and handle the tube.

1 is a longitudinal sectional view illustrating a pipe connection structure according to a first embodiment of the present invention.
2 is an exploded perspective view showing a part of the pipe connection structure according to the first embodiment of the present invention.
Figure 3 is an enlarged view of a portion of Figure 1;
4 is a longitudinal sectional view illustrating a pipe connection structure according to a second embodiment of the present invention.
Figure 5 is an enlarged view of a portion of Figure 4;
Figure 6 is a perspective view of the grip ring of Figure 4;
7 is a longitudinal sectional view showing a main part of a pipe connection structure according to a third embodiment of the present invention.
8 is a perspective view showing the grip ring of Fig.
9 is a longitudinal sectional view showing a part of the pipe connection structure according to the fourth embodiment of the present invention.
10 is a longitudinal sectional view showing a part of the pipe connection structure according to the fifth embodiment of the present invention.
11 is a longitudinal sectional view showing a part of the pipe connection structure according to the sixth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. For a better understanding of the invention, it is to be understood that the size of elements and the thickness of lines may be exaggerated for clarity of understanding. Further, the terms used to describe the embodiments of the present invention are mainly defined in consideration of the functions of the present invention, and thus may be changed depending on the intentions and customs of the user and the operator. Therefore, the terminology should be interpreted based on the contents of the present specification throughout.

1 to 3 show a pipe connection structure according to a first embodiment of the present invention.

In FIG. 1, reference numerals 1 and 2 denote first and second tubes connected to each other. In order to mutually connect the first tube 1 and the second tube 2, the first tube 1 is inserted into the insertion tube 10 and the second tube 2 has a socket 20 into which the insertion tube 10 of the first tube 1 is inserted. Of course, the tube connection structure according to the first embodiment of the present invention includes such a first tube 1 and a second tube 2.

The first tube 1 may be of the type that the insertion tube 10 is provided at both ends in the longitudinal direction, and the insertion tube 10 is provided at one of both ends in the longitudinal direction and the other is provided with a socket Reference numeral 20) may be provided. The second tube 2 may be of a type in which the socket 20 is provided at both ends in the longitudinal direction, and a socket 20 is provided at one of both ends in the longitudinal direction, and an insertion tube ) May be provided.

Depending on the material, the first pipe 1 may be a steel pipe, a cast iron pipe, a synthetic resin pipe, or the like. Alternatively, in the first tube 1, at least one or both of the ends constituted by the insertion tube 10 or the socket may comprise a carbon composite material, and the whole tube may comprise a carbon composite material. For example, the first tube 1 can be constructed by connecting the insertion tube 10 or the socket made of a carbon composite material to the end of a steel pipe, a cast iron pipe, or a synthetic resin pipe. As another example, the first pipe 1 may be composed of a carbon composite material alone or a mixed raw material in which a carbon composite material is mixed with a raw material (steel, cast iron, synthetic resin, etc.) The first tube 1 may be formed by laminating a carbon composite material to a predetermined thickness. As the carbon composite material, carbon fiber reinforced plastic (CFRP) having excellent strength and excellent in various characteristics such as light weight, corrosion resistance and dimensional stability can be used.

Depending on the form, the first tube 1 may be a mold. That is, it may be a tube whose cross section is not constant, such as a curved tube (see FIG. 1), a cross tube, a T tube (see reference numeral 2 in FIG. Of course, depending on the operating conditions, the first pipe 1 may be straight or straight.

A steel pipe is used as the second pipe (2). Depending on the operating conditions and the like, the second pipe 2 may be a pipe made of other material such as a cast iron pipe or a synthetic resin pipe. Alternatively, in the second pipe 2, at least one of both ends composed of the socket 20 or the insertion pipe may include a carbon composite material, or the entire pipe may include a carbon composite material, like the first pipe 1 have.

The second pipe 2 may be an intuitive pipe depending on the form, but it may be a diagonal pipe as mentioned above, but is not limited thereto.

The socket 20 has a structure enlarged by expanding processing such that the inner circumference of the tube insertion space into which the insertion tube 10 is inserted is larger than the inner circumference of the second tube 2. In the socket 20, the inner circumferential size (transverse sectional area) of the tube insertion space is determined according to the outer circumferential size of the insertion tube 10. Therefore, the inner circumference of the tube insertion space is formed to have the same size as the inner circumference of the second tube 2 by omitting expansion processing for forming the tube insertion space of the socket 20, (In the case of using a steel pipe as the first pipe, an insertion pipe is formed by machining the steel pipe to reduce the diameter of the pipe).

The socket (20) is provided with a coupling end (21) having an enlarged inner periphery at its tip end. Therefore, when the insertion tube 10 is inserted into the socket 20, a space is formed between the insertion tube 10 and the joint end 21.

2 and 3, the pipe connection structure according to the first embodiment of the present invention is characterized in that the pipe connection structure of the airtightness material inserted into the space between the insertion tube 10 inserted into the socket 20 and the joint end portion 21 A sealing ring 3 and a grip ring 4 respectively fitted to the outer periphery of the insertion tube 10 and first and second rolls 5 and 6. The first roller 5 is disposed between the sealing member 3 and the grip ring 4 and the grip ring 4 is disposed between the first roller 5 and the second roller 6.

The grip ring 4 is configured to shrink and grip the insertion tube 10 when retracted. A tapered surface 41 is formed on the outer circumference of the grip ring 4 to enlarge the outer periphery toward the insertion direction of the insertion tube 10. The grip ring 4 is contracted at the inner periphery of the grip ring 4 so that a spike 42 which protrudes into the insertion tube 10 when gripping the insertion tube 10 is protruded in a single or a plurality. The spikes 42 are formed in the inner circumferential direction of the grip ring 4 and spaced apart from each other along the width direction of the grip ring 4 when the plurality of the spikes 42 are provided.

The grip ring 4 has an opening 43 formed on one side thereof so as to have a structure (C-shaped structure) in which one side is opened. According to the opening portion 43, the grip ring 4 can be contracted while being deformed so that both ends thereof come close to each other.

The grip ring 4 has both ends as it has an opening 43. The spikes 42 also extend to both ends of the grip ring 4 and have ends located at both ends of the grip ring 4, respectively. The grip ring 4 and the spike 42 thereof are configured such that the grip ring 4 is not contracted or abnormally contracted as both end portions of the grip ring 4 are stuck in the insertion tube 10 In order to prevent this, as shown in Fig. 2, the portions where both end portions meet with the inner circumference are formed as rounds R1 and R2 or slopes by chamfering treatment.

On the other hand, the grip ring 4 may be made of metal. Alternatively, the grip ring 4 may include the above-described carbon composite material, for example, a carbon composite material alone, or a mixed material obtained by mixing a carbon composite material with a raw material.

A pressing surface 51 for pressing the sealing member 3 in the inserting direction is formed in a portion of the first roller 5 opposed to the sealing member 3 and a pressing surface 51 for pressing the sealing ring 3, A stop surface 52 contacting the grip ring 4 is formed at a portion opposed to the stopper surface 4. The second roller 6 has a tapered surface 61 corresponding to the tapered surface 41 of the grip ring 4. The first and second rollers 5 and 6 may be formed with contact surfaces that are in contact with each other.

As shown in Fig. 3, the pipe connection structure according to the first embodiment of the present invention further includes a first pressurizing mechanism 7 and a second pressurizing mechanism 8. As shown in Fig. 3 (A) is a cross-sectional view illustrating a pipe connection structure according to a first embodiment of the present invention, with (A) showing a first pressurizing mechanism 7 as a center, The pipe connection structure according to the first embodiment of the present invention is represented.

The sealing member 3 between the insertion tube 10 and the joint end portion 21 is pressed by the pressing surface 51 of the first roller 5 to be connected to the insertion tube 10, And serves to approach the socket 20 and the first roller 5 so as to be positioned in the press-fit state in the space between the end portions 21. The second pressurizing mechanism 8 presses the tapered surface 41 of the grip ring 4 and the tapered surface 61 of the second roller 6 in close contact with each other so that the grip ring 4 is contracted to grip the insertion tube 10 .

The first pressing mechanism 7 includes first bolts 71 having hooks formed on the head and first nuts 72 engaged with the first bolts 71, respectively. The first bolts 71 are formed on the outer periphery of the body with a male screw for screw connection with the first nuts 72. The first bolts 71 may be configured such that the head is a hook bolt having a hook and a hook bolt or a head of a general bolt so as to form a step between the head and the body.

The joint end (21) is provided with a socket jaw (25) on the outer periphery of which an engagement protrusion of the first bolts (71) is caught. In the socket 20 provided in the second pipe 2 using the steel pipe, the joint end portion 21 is formed at the tip end of the socket 20 in a shape widened outwardly by expansion processing, (22) and a socket ring (23) fitted to the outer periphery of the taper pipe (22). A tapered surface 25 corresponding to the tapered pipe 22 is formed on the inner periphery of the socket ring 23. The socket jaw 25 is formed at the outer periphery of the socket ring 23 forming the outer periphery of the joint end 21.

The space between the insertion tube 10 and the joint end 21 is formed so as to have a cross section of a triangular structure so that the sealing member 3 is formed to have a cross- Is also formed to correspond to the space between the insertion tube 10 and the joint end 21. For example, the sealing member 3 may be a rubber ring.

The first through holes 54 through which the first bolts 71 with the stopping jaws are respectively passed are formed at intervals in the first roller 5 such that the first through holes 54 are spaced from each other along the circumferential direction. The first bolts 71 pass through the first through holes 54 while the latching jaws are caught by the socket jaws 25 and the first nuts 72 are fastened to the socket jaws 25 Respectively, of the first bolts 71 that have passed through the first through holes 54. As shown in FIG.

Therefore, when the first nuts 72 are tightened, the socket 20 and the first roller 5 are moved toward each other (in a direction in which at least one of the socket and the first roller is approached) 3 are pressed by the pressing surface 51 of the first roller 5 so that they are pressed into the space between the insertion tube 10 and the joint end 21 tightly. Of course, when the socket 20 is moved during this pressing process, the second tube 2 is also moved in the same direction.

The second pressurizing mechanism 8 includes second bolts 81 having male threads formed on the body and second nuts 82 respectively coupled to the bodies of the second bolts 81. The second bolts 81 have a common bolt head.

Second through holes 65 through which the second bolts 81 pass are formed in the second roller 6. The second through holes 65 are arranged to be spaced apart from one another along the circumferential direction in a direction parallel to the center of the second roller 6 and to the second roller 6. The communication holes 55 corresponding to the second through holes 65 are formed in the first roller 5 so that the second bolts 81 passing through the second through holes 65 can pass therethrough. And the communication holes 55 communicating with the second through holes 65 are disposed between the first through holes 54. [

The second bolts 81 pass through the communicating holes 55 and the second through holes 65 and the second nuts 82 pass through the communicating holes 55 and the second through holes 65, And the second bolts 81 passing through the second bolts 81 are joined.

Therefore, when the second nuts 82 are tightened while the socket 20 and the first roller 5 are fixed by the first pressing mechanism 7, the grip ring 4 and the second roller 6 are rotated The tapered surfaces 41 and 61 come into close contact with each other. That is, the second roller 6 is moved toward the first roller 5, the grip ring 4 is pushed by the moved first roller 5, and the tapered surface 41 of the grip ring 4, The tapered surface 61 of the two rollers 6 is supported by the grip ring 4 by the first roll 5 which is continuously moved as the grip ring 4 comes into contact with the stop surface 52 of the first roll 5 The grip ring 4 is contracted and grips the insertion tube 10 with the grip ring 4 contracted. The retracted grip ring 4 is engaged with the insertion tube 10 and moves together with the insertion tube 10 because the spike 42 is stuck in the insertion tube 10. Of course, as the grip rings 4 are tightened with the second nuts 82, the spikes 42 are embedded further into the insertion tube 10.

In this way, in the gripping of the insertion tube 10 with the grip ring 4 for the integral action of the insertion tube 10 and the grip ring 4, the grip ring 4 has an angle (Refer to reference numeral R1 in Fig. 2) and angular portions (refer to R2 in Fig. 2) where the both ends of the spike 42 meet with the inner circumference are formed as round or slant surfaces by chamfering, It is possible to prevent both ends of the both ends or the spike 42 from becoming stuck and shrinking or being abnormally contracted.

The first tube (1) or the second tube (2) can be moved in a direction separated by various external forces. However, in the first embodiment of the present invention, since the tapered surface 41 of the grip ring 4 is formed in such a shape that the outer periphery of the grip ring 4 is gradually enlarged toward the insertion direction of the insertion tube 10 The grip ring 4 grips the insertion tube 10 with a stronger pressure as the first tube 1 or the second tube 2 is separated from the first tube 1 or the second tube 2, It is possible to more reliably prevent the separation of the two pipe 2.

The first embodiment of the present invention is characterized in that the grip ring 4 is disposed between the first and second rollers 5 and 6 and the second ring gear 5 is rotated by using the second bolts 81 and the second nuts 82 Since the grip ring 4, the first and second rollers 5 and 6 are assembled by combining the first and second rollers 5 and 6, the grip ring 4, It is possible to conveniently carry out storage or transportation of the first and second rolls 5 and 6 in an assembled state and also to insert the grip ring 4 and the first and second rolls 5 and 6 It can be easily fitted into the outer periphery of the tube 10 at once in an assembled state.

The portion of the insertion tube 10 to be gripped by the grip ring 4 may be formed of synthetic resin on the entire outer surface or on the outer surface so that the spike 42 can easily be embedded in the insertion tube 10. [ The structure in which the portion of the outer surface of the insertion tube 10 gripped by the grip ring 4 is formed of synthetic resin is made of polyethylene (PE), epoxy, polyvinyl chloride (PVC), nylon a synthetic resin pipe such as nylon may be used, or a synthetic steel pipe may be used. Alternatively, a synthetic resin layer may be formed by separately performing a step of coating the above-mentioned kind of synthetic resin with a predetermined thickness.

On the other hand, the communication holes 55 may be formed with receiving grooves for receiving the heads of the second bolts 81 that have passed through the communication holes 55 to protect the heads of the second bolts 81. The receiving grooves for receiving the heads of the second bolts 81 may be formed in the second through holes 65 other than the communication holes 55 and may be formed in the second through holes 65 May also be formed.

On the other hand, hook bolts may be applied to the second bolts 81.

4 to 6 show a pipe connection structure according to a second embodiment of the present invention.

4 to 6, the tube connection structure according to the second embodiment of the present invention is the same as the first embodiment except that the second tube 2A, The construction using the cast iron tube, the application structure of the second pressurizing mechanism 8A, and the structure of the grip ring 4A are different. This is explained as follows. 5, (A) is a sectional view showing the second embodiment of the present invention with the first pressurizing mechanism 7 as a center, (B) is a sectional view of the second pressurizing mechanism 8A Sectional view showing a second embodiment of the present invention.

The second pipe 2A using the cast iron pipe is provided with the joint end 21A at the tip of the socket 20A. The joint end portion 21A is molded together with the socket 20A by casting so that the socket jaw 25 is formed on the outer periphery while having an enlarged inner periphery so that the sealing member 3 can be inserted.

The second pressing mechanism 8A includes a plurality of second bolts 81A and a second nut 82. [ The head of the second bolts 81A is provided with a latching jaw, and the second nuts 82 are screwed to the bodies of the second bolts 81A. The second bolts 81A may be a hook bolt having a hook formed with a hook and a head. Alternatively, the second bolts 81A may have a head of a normal bolt, so that the step formed between the head and the body may be formed as a holding jaw.

The second bolts 81A are hooked on the socket jaw 25 by the engagement jaws. The communication holes 55A corresponding to the second through holes 65 of the second roller 6 are formed in the first roller 5A. The second bolts 81A, which are caught by the socket jaws 25, respectively, are passed through the communication holes 55A and the second through holes 65, which coincide with each other. The second nuts 82 are thus engaged with the second bolts 81A passing through the communication holes 55A and the second through holes 65. [

Since the first bolts 71 and the second bolts 81A are respectively engaged with the nuts 81 and 82 while being caught by the socket jaws 25, The sealing member 3 can be pressed by the combined action of the first bolts 71 and the first nuts 72 and the second bolts 81A and the second nuts 82, The second bolts 81A and the second nuts 82 can hold the press-in state of the sealing member 3 and the grip state of the grip ring 4A even if the first and second bolts 71 and 71 are damaged. In addition, according to this, the first bolts 71 are somewhat fragile in structure but relatively inexpensive types are applied, thereby reducing the unit cost.

The grip rings 4A are unit rings 410 arranged at regular intervals so as to be spaced apart from each other along the circumferential direction and means for elastically connecting neighboring unit rings 410 between the unit rings 410 And includes an elastic member 420.

When the tapered surface 41 of the grip ring 4A and the tapered surface 61 of the second pressure ring 6 are brought into tight contact with each other by tightening the second nuts 82, the grip ring 4A having the above- 420 are compressed, whereby the interval of the unit rings 410 is reduced. Thus, the grip ring 4A is contracted.

Meanwhile, the unit rings 410 may be made of metal. Alternatively, the unit rings 410 may include the above-described carbon composite material. For example, the unit ring 410 may be made of a carbon composite material alone or a mixed raw material in which a carbon composite material is mixed with a raw material. The elastic member 420 may be made of an elastic material such as rubber.

The tube connection structure according to the third embodiment of the present invention is shown in Figs. 7 and 8. Fig.

As shown in Figs. 7 and 8, the tube connection structure according to the third embodiment of the present invention is the same as the first and second embodiments, The configuration in which the first and second rollers 5 and 6A are integrally formed, the application structure of the second pressurizing mechanism 8B, and the configuration of the grip ring 4B are different. This is explained as follows.

The portions of the first and second rolls 5 and 6A facing each other are integrally connected. That is, in the first embodiment and the second embodiment, the first and second rollers 5 and 6A have a configuration in which the rollers are divided into the first and second rollers, . For example, the first and second rolls 5 and 6A can be formed by casting.

3 and 5) and the communication hole (reference numerals 55 and 55 in Fig. 3), the first and second rollers 5 and 5, 5, reference numeral 55A) may be removed.

The second pressurizing mechanism 8B includes a plurality of second bolts 81B having a latching jaw formed on the head and second nuts 82B screwed to the bodies of the second bolts 81B. The second bolts 81B may be a hook bolt whose head is constituted by a hook and which has a latching jaw, or may have a head of a normal bolt, so that the step between the head and the body may be a latching jaw.

The grip ring 4B is provided with a ring-shaped tapered portion for hooking the second bolts 81B. The second through holes 65A through which the second bolts 81B with the engaging jaws are respectively passed are formed in the second roller 6A and the second nuts 82B are engaged with the ring gear of the grip ring 4B. And are respectively coupled to the second bolts 81B which have passed through the second through holes 65A in a state where the engagement jaws are engaged with the ring tails of the grip ring 4B.

As shown in Fig. 8, the grip ring 4B differs from the grip ring of the first embodiment (see reference numeral 4 in Fig. 2) only in that it further includes an incision structure for guiding contraction. That is, the grip ring 4B has at least one slit 44 formed in at least one of an inner circumference and an outer circumference at a predetermined depth and has a cut-out structure.

It is preferable that the slit 44 is formed on both the inner periphery and the outer periphery of the grip ring 4B from the viewpoint of improving the shrinkage inducing effect. Then, the grip ring 4B is contracted to conform to the shape of the insertion tube 10 as the inner circumferential slit 44 is wrinkled and the outer circumferential slit 44 is opened.

The essential part of the pipe connection structure according to the fourth embodiment of the present invention is shown in Fig.

As shown in Fig. 9, the pipe connection structure according to the fourth embodiment of the present invention is different from the first embodiment (or the second embodiment or the third embodiment) Except that the clamping band 90 and the band groove 45 on which the clamping band 90 is placed are different.

The clamping band 90 serves to clamp the grip ring 4 fitted to the outer periphery of the insertion tube 10 and the insertion tube 10 to fix the grip position of the grip ring 4 more reliably. According to the clamping band 90, the tapered surface 41 of the grip ring 4 and the tapered surface (refer to reference numeral 61 in FIG. 3) of the second roller (see reference numeral 6 in FIG. 3) The grip ring 4 can be further reliably contracted by restricting the phenomenon that the grip ring 4 is pushed and moved by the second rolling (refer to reference numeral 6 in Fig. 3) in the process of contracting the grip ring 4 .

A band groove 45 is formed on the outer periphery of the grip ring 4 in which the clamping band 90 is placed to prevent the displacement of the clamping band 90 for clamping the grip ring 4 to the insertion tube 10.

The clamping band 90 may be formed such that the band has a strip shape as shown in Fig. 9A, or the band may have a band shape as shown in Fig. 9B.

The band groove 45 may be formed to have only an open top shape as shown in FIG. 9A, or may have an open top shape and only one side as shown in FIG. 9B It is possible.

On the other hand, the fourth embodiment of the present invention may have a configuration in which the stopper surface (see reference numeral 52 in FIG. 3) is excluded as the clamping band 90 is provided.

The essential part of the pipe connection structure according to the fifth embodiment of the present invention is shown in Fig.

10, the pipe connection structure according to the fifth embodiment of the present invention is the same as the first embodiment (or the second embodiment or the third embodiment) And further includes a concavo-convex structure for fixing the grip position of the grip ring 4 more reliably. To this end, the fourth embodiment of the present invention includes a position fixing convex portion 95 and a position fixing concave portion 96 constituting the concavo-convex structure.

The convex portion 95 is provided to protrude from either the outer periphery of the insertion tube 10 or the inner periphery of the grip ring 4 and the concave portion 96 is provided on the outer periphery of the insertion tube 10 and the outer periphery of the grip ring 4 The grip ring 4 is provided in a concave shape so as to be engaged with the convex portion 95 when the grip ring 4 is moved in the insertion direction of the insertion tube 10.

3) of the tapered surface 41 of the grip ring 4 and the second roller (refer to reference numeral 6 in Fig. 3) by the convex portion 95 and the concave portion 96 constituted in this way, By limiting the phenomenon that the grip ring 4 is pushed and moved by the second rolling (refer to reference numeral 6 in Fig. 3) in the process of tightening the grip ring 4 ) Can be more reliably contracted.

10A shows a configuration in which the convex portion 95 is provided on the inner periphery of the grip ring 4 and the concave portion 96 is provided on the outer periphery of the insertion tube 10. 10B shows a configuration in which the convex portion 95 is provided on the outer periphery of the insertion tube 10 and the recess 96 is provided on the inner periphery of the grip ring 4. [

Although not shown, the fifth embodiment of the present invention may further include a clamping band (refer to reference numeral 90 in Fig. 9) and a band groove (refer to reference numeral 45 in Fig. 9) in the fourth embodiment.

The main part of the pipe connection structure according to the sixth embodiment of the present invention is shown in Fig.

11, the tube connection structure according to the sixth embodiment of the present invention is the same as the first embodiment (or the second embodiment) The second embodiment differs from the first embodiment in that it further includes a structure for temporarily assembling (coupling) the first and second rolls 5 and 6B. This is explained as follows.

The first rollers 5 are provided with a single or a plurality of holders 59 protruding toward the second rollers 6B. 11 (A), the holder 59 protruding from the first roller 5 toward the second roller 6B is moved by the frictional force caused by the contact with the second roller 6B, 6B to temporarily limit the movement of the second roller 6B by temporarily coupling the first roller 5 and the second roller 6B.

According to such a holder 59, the movement of the second roller 6B can be restricted by temporarily coupling the first roller 5 and the second roller 6B fitted in the outer periphery of the insertion tube 10 The tapered surface 41 of the grip ring 4 and the tapered surface 41 of the second roller 6B (see FIG. 3) by the second bolt (see reference numeral 81 in FIG. 3) 61 are brought into close contact with each other and the grip ring 4 is contracted so that the second roller 6B is touched and the tapered surface 41 of the grip ring 4 and the tapered surface 61 of the second roller 6B are brought into close contact with each other So that it can be prevented from being made unstable.

Fig. 11A illustrates that the holder 59 is in contact with the outer periphery of the second roller 6B. 11B shows a state in which the insertion hole 69 in which the holder 59 is inserted in the second roller 6B and the insertion groove are formed and the holder 59 is inserted into the insertion hole 69 or the insertion groove, 2 contact with the pressure roller 6B. Since the contact area between the holder 59 and the second pressure roller 6B is increased by applying the insertion hole 69 or the insertion groove 69, the provisional engagement of the first pressure roller 5 and the second pressure roller 6B .

11 (B), reference numeral P1 denotes a round protruding portion, P2 denotes a groove portion in which the protruding portion P1 is fitted, protruding portion P1 is formed in the insertion hole 69 or the insertion groove, (P2) is formed in the holder (59). The positions of the protruding portion P1 and the groove P2 may be reversed. According to the projecting portion P1 and the groove P2, the temporary engagement of the first and second rollers 5 and 6B can be more stably achieved.

Although not shown, the sixth embodiment of the present invention is different from the clamping band (refer to reference numeral 90 in Fig. 9), the band groove (refer to reference numeral 45 in Fig. 9) 10) and a concave portion (refer to reference numeral 96 in Fig. 10).

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Further, the technical ideas described in the embodiments of the present invention may be performed independently of each other, or two or more may be implemented in combination with each other.

1: first tube 2, 2A: second tube
3: sealing member 4, 4A, 4B: grip ring
5, 5A: first roll 6, 6A, 6B: second roll
7: first pressing mechanism 8, 8A, 8B: second pressing mechanism
10: insertion tube 20, 20A: socket
21, 21A: joint end 25: socket jaw
41: tapered surface of the grip ring 42: spike
51: pressure face 54: first through hole
55, 55A: communicating hole 59: holder
61: tapered surface 65 of the second roller, 65A: second through hole
69: insertion portion (insertion hole or insertion groove) 71: first bolt
72: first nut 81, 81A, 81B: second bolt
82, 82B: second nut 90: clamping band
95: convex portion 96: concave portion

Claims (15)

A first tube having an insertion tube at least at one or more ends thereof;
A second tube provided with a socket into which the insertion tube is inserted at least one end thereof and a joint end having an enlarged inner circumference at the tip of the socket;
A sealing member inserted between the insertion tube inserted into the socket and the joint end;
A grip ring fitted to an outer periphery of the insertion tube and configured to grip the insertion tube in a contractible and contractible state and having a tapered surface formed on an outer periphery thereof to enlarge an outer periphery toward the insertion direction of the insertion tube;
A first pressure wheel which is fitted to the outer periphery of the insertion tube and has a pressing surface for pressing the sealing member in the insertion direction and a second pressure wheel which is divided by the first pressure wheel and has a tapered surface corresponding to a tapered surface of the grip ring, ;
A first pressing mechanism that approaches the socket and the first roller so that the sealing member is pressed by the pressing surface;
And a second pressing mechanism for bringing the tapered surface of the grip ring into close contact with the tapered surface of the second roller so that the grip ring is contracted,
Wherein the first pressing mechanism includes a plurality of first bolts provided with hooks on the head and a plurality of first nuts respectively coupled with the first bolts,
And a socket jaw is provided on an outer periphery of the joint end to receive a jaw of the first bolts,
Wherein the first through-holes are formed with first through-holes through which the first bolts with the engaging jaws are respectively passed through the socket jaws,
The first nuts are engaged with the first bolts passing through the first through holes in a state where the engaging jaw is engaged with the socket jaws so that the socket and the first roller are tightened when the first nuts are tightened,
Wherein the second pressing mechanism includes a plurality of second bolts and a plurality of second nuts respectively coupled with the second bolts,
And communication holes and second through holes are formed in the divided first and second rotors so as to allow the second bolts to pass therethrough respectively,
Said first roller having a stop surface in contact with said grip ring,
Wherein the second nuts are engaged with the second bolts passing through the communication holes and the second through holes which coincide with each other so that when the second nuts are tightened, The grip ring is contracted in a state of being in close contact with the tapered surface,
The second pipe is a steel pipe,
The coupling end
A tapered tube having an enlarged inner periphery formed at a distal end of the socket and opened outwardly by expansion;
And a socket ring fitted to an outer periphery of the taper pipe and having the socket jaw formed on an outer periphery thereof,
Wherein the grip ring is composed of a plurality of unit rings arranged along the circumferential direction,
Wherein the first pressure roller is protruded toward the second pressure roller and contacts the outer circumference of the second pressure roller to hold the second pressure roller and temporarily combine the divided first pressure roller and the second pressure roller, Which is provided with a holder for limiting the diameter
Pipe connection structure. delete delete delete delete The method according to claim 1,
And a tapered surface corresponding to the tapered pipe is formed on the inner periphery of the socket ring.
Pipe connection structure. delete delete delete The method according to claim 1,
At least one or more slits for inducing shrinkage of the grip ring are formed on at least one of an inner periphery and an outer periphery of the grip ring,
Pipe connection structure. The method according to claim 1,
Further comprising a clamping band for clamping said grip ring to said insertion tube,
Pipe connection structure. The method according to claim 1,
Wherein the protrusion is provided on one of the outer periphery of the insertion tube and the inner periphery of the grip ring and the other is provided with a recess for restricting movement of the grip ring in the inserting direction of the insertion tube by engagement action with the protrusion, Provided,
Pipe connection structure. The method according to claim 1,
Wherein the insertion tube has at least a portion of the outer surface gripped by the grip ring formed of a synthetic resin,
Pipe connection structure. delete delete

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