KR20180101152A - Method of connecting and reinforcing steel pipes and fastener used therein - Google Patents

Abstract

The present invention relates to a tube joining method and a fastener used therefor, characterized by comprising: a fixing bolt having a head unit having a small cross section as compared with a joint hole and a body unit having a male thread portion extending in the small cross section compared to the head unit; a folding washer which interferes with the joint hole in a deployed state, but passes through the joint hole when a posture is changed in a folded state, and force to unfold itself is applied; and a fixing nut which is fastened to a part of the body unit located outside the joint hole in a state where the head unit and the folding washer are inserted into the joint hole. Therefore, even if the inner diameter of a first tube is narrow, a coupling tube and the first tube can be jointed to each other by a rigid and simple process, and the joinable fastener and the tube joining method using the same can be provided.

Description

METHOD OF CONNECTING AND REINFORCING STEEL PIPES AND FASTENER USED THEREIN BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a tube joining method and a joining tool used therein, and more particularly, to a joining operation in which welding is excluded in a state in which the ends of adjacent tubes in the longitudinal direction are accurately aligned and not deformed, To a jointing method of a tube capable of improving the connection strength of the joint of the tube.

Generally, in construction and civil engineering sites, tubes with high flexural rigidity are widely used as structural members, and are mainly used with two or more tubes connected in the longitudinal direction.

The method of connecting the tubes is disclosed in Korean Patent Laid-Open No. 10-2012-71002, a bolt fastening method using a connecting plate or a connecting tube, and a method of concurrent filling and welding of concrete disclosed in Korean Patent Publication No. 10-945049 And a method of joining and connecting other tubes with welding has been proposed.

However, in the case of connecting tubes at the same place as a high mountain region, since the power supply is unstable and the welding quality is low, it is necessary to firmly connect the tubes while excluding welding.

The construction method of connecting the tube by bolt tightening without welding is shown in Figs. 1 to 2B. 2A, the connection tube 30 is first inserted into the first tube 10, and the first through hole 10a, which is disposed around the first tube 10 with an interval therebetween, The fastening bolt 88 is fastened to the first through hole 10a and the connection through hole 30a in a state in which the tube rotation position is adjusted so that the connection through hole 30a, The first tube 10 is connected to the connection tube 30 by being fastened to the end of the fastening bolt 88 with a fixing nut 89. [

Then, as shown in FIG. 2B, the second tube 20 is inserted so that the connection tube 30 is positioned inside, and the second through hole (the second tube 20) The fastening bolt 88 is inserted into the second through hole 20a in a state in which the rotational position of the tube 20 is adjusted so that the connecting through holes 30a arranged at intervals around the connecting tube 20a are communicated with each other, After passing through the connecting through hole 30a, the fixing bolt 88 is fastened with a fixing nut 89 at the end of the fastening bolt 88. [ Thus, the first tube 10 and the second tube 20 can be connected to each other in the longitudinal direction via the connecting tube 30. [ At this time, the outer diameter Y3 of the connecting tube 30 is formed to be smaller than the inner diameter Y1 of the first tube 10 and the inner diameter Y2 of the second tube 20.

However, since the inner diameter of the connecting tube 30 and the inner diameter of the tubes 10 and 20 are not sufficiently large, the operator does not enter the inner space of the tubes 10 and 20 It is impossible to fasten the fastening bolt 88 and the fixing nut 89. Therefore, there is a limit in application. Further, even when a joint process is required in a state in which the hollow columns are formed with the tubes 10 and 20, there is a problem that it is difficult for the operator to enter and exit the inner space of the tubes 10 and 20, and thus it is not applicable.

It is possible to consider such a problem by applying a fastening screw for forming a screw thread by screwing instead of applying the fastening bolt 88. However, compared to the combination of the fastening bolt 88 and the fastening nut 89, And there is a limit that the supporting ability by the screw thread formed on the steel material by the fastening screw is further lowered.

Therefore, there is an increasing need to connect the tubes with the bolts 88 and the nuts 89, regardless of the size of the tubes or the shape of the tubes, while eliminating welding.

In this connection, U.S. Patent Application Publication No. 2008/0010805 discloses a method of inserting a bolt portion fixed to a rod in a fastening manner into a tube first, inserting a folding washer together with the bolt portion, and then folding the washer into the tube, A method has been proposed in which a bolt is fastened to the bolt portion from the outside while being fastened to the inside of the tube by the head and the folding washer.

However, the technique disclosed in the above publication causes a problem that the folding washer does not spread well inside the tube, thereby delaying the operation, and in some cases, the folding washer is not unfolded, thereby causing a failure. Accordingly, there is a great demand for a method of approaching the tube from the outside of the tube and connecting the tube within an accurate and short time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of joining a tube that firmly joins a tube in situ while eliminating welding, and a connector used therefor, in order to solve the above problems.

That is, an object of the present invention is to provide a tube that is robust and easy to be worn even when it is installed in a place where the power supply can not be stably supplied as in a high altitude zone.

Particularly, the present invention is characterized in that, in order to fix the connection through-hole of the first tube and the connection tube of the first tube by the bolt fastening method, the head portion of the fixing bolt and the folding washer are inserted into the first through- So that the operation of unfolding the washer can be reliably deployed independently of the skill of the operator, thereby shortening the construction time and enabling accurate construction installation.

In the present invention, in connecting and fixing the first tube and the connection tube, the two tubes to be connected are connected to each other by surface contact instead of being connected to each other by point contact, And the cross section of the connecting tube of the first tube and the connecting tube resist each other to obtain more rigid joint characteristics.

In order to achieve the above object, the present invention provides a fastener for use in a joint of a tube, comprising: a head portion having a smaller cross section than a joint hole; and a body portion extending in a small cross- A fixed bolt made of a metal; A folding washer which interferes with the joint hole in an unfolded state but is passed through the joint hole when the folded state is changed to a posture; A fixing nut fastened to a part of the body part located outside the joint hole in a state where the head part and the folding washer are inserted into the joint hole; The present invention provides a joint fastener comprising:

With this configuration, in the state where the folding washer and the fixing bolt are inserted into the inner space of the tube from the outside of the tube, the folding washer is spread out of the tube so that the folding washer interferes with the joint hole of the tube, By fastening the fixing nut to the fixing bolt, it is possible to connect the tube to the connection tube (or another tube).

In particular, since the folding washer of the above-mentioned joint fastener is configured to exert a force to unfold itself, it is difficult to unfold the folding washer in a state where the folding washer is inserted into the inside of the tube to solve the conventional problem that the workability is very low, The folding washer is inserted into the inside of the tube irrespective of the skill of the user, so that it is possible to reduce the time and manpower required for the tube joining process and improve the accuracy of the operation.

 Here, the folding washer can be constituted so that a force for unfolding itself acts by allowing the magnetic force in the unfolding direction to act.

For example, in the folding washer, the segment washers divided into two are connected to each other by a connection pad through magnetic pads which act on the magnetic force. By the magnetic force, repulsive force acts on the segment washers in mutually spreading directions, Can be configured to act on the force. However, when a force exerted by the magnet pads is applied, a force for pushing out the two segment washers becomes smaller as the magnet pad is unfolded, even if a force for expanding the two segment washers is applied by the magnetic force. There is a limit in that the segmented washers can not be completely unfolded in a single plane.

The folding washer is divided into a first segmented washer and a second segmented washer, and contact surfaces of the first segmented washer and the second segmented washer, which are in contact with each other in a state in which the folded washer is unfolded, Magnets can be installed. Thus, when a magnet acting on the opposing faces of the first segment washer and the second segment washer is installed, the force of expansion of the two segment washers in one plane is greatly exerted by the attractive force of the magnet, . However, when the first segment washer and the second segment washer are completely folded so as to overlap with each other, since the attracting force of the magnet of the first segment washer and the magnet of the second segment washer is small, The worker may be required to pull the folded washer from the folded position to the extended position in a state in which the folded washer is pushed in the state of being put on the inner surface of the joint hole of the tube.

On the other hand, in the case of connecting the tube made of metal, there is a problem that the force that causes the folding washer to spread by the magnetic force acts on the tube or the magnet sticks to the tube due to the magnetic force,

Therefore, the folding washer is divided into a first segment washer and a second segment washer, and a projection is formed in a ring shape on the surface of the folding washer facing the joint hole, and the outer peripheral surface of the projection is formed into a closed loop It is most effective that the elastic ring is constituted in a state of being stretched in a state of being stretched. For example, the elastic ring may be a rubber band.

Thus, by providing an elastic ring on the projecting portion, and by arranging the elastic ring in a tensioned state in which the elastic ring is stretched in an appropriate amount, the two segmented washers act as a self-expanding force owing to the elastic restoring force of the elastic ring, The self-expanding force acts on the resilient ring due to the resilient restoring force of the resilient ring, and as long as there is a tensile displacement in the resilient ring, the self-spreading force acts until the two segmental washers are completely unfolded. Furthermore, the folding washer can be reliably unfolded without being affected by the material of the tube to be joined, the material of the surrounding installation, and the like.

Here, the projecting portion may protrude in a direction to be inserted into the joint hole. The elastic ring is seated on the protruding portion along the circumferential direction to guide the elastic ring. The elastic ring is seated in the folded washer in the folded state and in the unfolded state. The elastic restoring force of the elastic ring, The force of unfolding can work.

The first segment washer and the second segment washer may be connected by a connection pad or a hinge and may be allowed to fold or unfold one another.

When the folding washer is unfolded, projections and grooves engage with each other are formed on the side surfaces of the first segment washer and the second segment washer that are in contact with each other. When the folding washer is unfolded, It is preferable that the folding washer is kept unfolded by the interference of the groove.

The space may be formed as an empty space between the folding washer and the fixing nut, but a sleeve for covering the fixing bolt may be interposed. A fixing washer formed between the first tube and the fixing nut, the protrusion being inserted into the coupling hole; So that the joint fastener is seated and fixed at a predetermined position in the joint hole.

Here, the surface where at least one of the folding washer and the fixing washer is in contact with the tube may be formed as a curved surface. This allows the folded washer and fixed washer to be firmly connected while contacting the tube over a larger area, with the contact surface of the folded washer and the fixed washer being formed into a curved surface that approximates the curved surface of the tube.

A sealing washer having a capsule containing a sealing material is interposed between the folding washer and the fixing nut. The capsule is blown by the pressing force of the fixing nut, so that the sealing material can seal around the fixing bolt have. Thus, the sealing material is filled in the joint hole of the tube, thereby preventing the entrance of foreign matter or foreign matter into the tube, so that the life of the tube can be guaranteed for a longer time.

The joint fastener may include an end fixing part for fixing the fixing bolt in a state where the end of the fixing bolt is fastened and a fixing member having a thin section so that the folding washer can be put in a folded state And can be installed using a washer mounting portion. In this way, the fixing bolt is mounted on the end of the fixing bar, and the fixing bar is inserted into the fitting hole of the tube while the folding washer is put on, so that the installation and installation can be made simpler.

The washer rest portion is provided with a retaining member for contacting the folded surfaces of the folding washer and holding the folded washer in a folded state, so that the folding washer can be held in a folded state by the retaining member. Accordingly, even if the operator does not hold the folding washer to prevent the folding washer from spreading by itself, the folding type washer is held by the holding member during the process of inserting the folding washer which is hooked on the fixing bar into the fitting hole, It is not disturbed to be inserted into the joint hole while spreading, so that the jointing process can be performed more easily.

Particularly, when the worker needs to look at the upper side of the joint fastener, the worker may not be able to catch the fold washer. In this case, since the folding washer can be kept folded by the holding member, It is possible to obtain an effect that workability is much improved when a fastener is installed.

Meanwhile, the washer mounting portion includes at least a region where a protruding member formed to have a larger width is disposed above the mounting member. As a result, the folding washer is folded and partly placed on the bottom surface of the projecting member in a different posture, so that the folding washer can stably hold the posture that is laid on the mounting member of the washer mounting portion.

The fixing bar further includes a pusher for pushing the folding washer away from the washer mounting portion when the folding washer is inserted into the fitting hole with the folding washer being positioned in the washer mounting portion, The folding washer inserted into the joint hole is pushed out of the washer mounting portion by the pusher so that the process of guiding the folding washer to interfere with the joint hole in the inner space of the tube can be performed more easily by the self- .

According to another aspect of the present invention, there is provided a plasma processing apparatus comprising: a first tube having a first through hole at a plurality of positions in a circumferential direction; A connection tube positioned at a plurality of positions in the circumferential direction, the connection tube being aligned with the first through-hole and located inside the first tube; The coupling bolt of the above-mentioned configuration is characterized in that the coupling bolt has a head portion penetrating through the first through hole and the connection hole and located inside the coupling tube and an inner diameter which is not separated by the head portion, And a fixing nut fixed to the fixing bolt while being supported by an outer wall of the first tube; Thereby providing a seamless structure of the tube that contains it.

At least one of a first bonding region formed to have a thinner thickness than the other regions and a connection bonding region formed to have a thinner thickness than the other regions in the region surrounding the connection hole may be formed in the region surrounding the first through- Is preferably formed.

As a result, a minute gap (c) is generated between the first tube and the connection tube in the process of arranging the first tube and the connection tube so as to overlap with each other. However, since the first joint And the connection joint region surrounding the connection hole, the first tube and the connection tube are not connected only by the shear force of the fixing bolt, and the first connection region and the second junction region in the process of tightening the fixing nut and the folding washer, The connecting joint regions are plastic-deformed, and the tubes are brought into surface contact with each other, thereby realizing a more rigid joint structure.

According to another aspect of the present invention, there is provided a tube joining method for joining a first tube having a first through-hole formed therein and a connecting tube having a connecting through-hole formed thereon in a longitudinal direction using a joining fastener having the above- A connection tube disposing step of disposing the connection tube so that the connection hole is aligned with the first through hole; A fixing bolt inserting step of inserting the fixing bolt having the head portion having a small cross section in comparison with the first through hole and the connecting through hole through the first through hole and the connection hole from outside; The folded washer inserted into the first through hole and the connection hole is inserted into the first through hole and the connection hole, and the folded washer is inserted into the first through hole and the connection hole when the folded washer interferes with the first through hole and the connection hole, The folding washer is disposed on the body portion of the fixing bolt so that the folding washer is interfered with the connecting through hole to prevent the folding washer and the fixing bolt from being separated from the first through hole. An inserting step; And fixing a nut to the body of the fixing bolt by fastening a fixing nut to the outside of the first tube to connect the connection tube and the first tube; And a plurality of pipe joints.

As a result, when the first tube and the connection tube are bolted to each other, the head of the fixing bolt is inserted into the inner space of the first tube by using a folding washer, the folding washer is folded and passed through the first through hole and the connection hole The folding washer is unfolded so as to extend over the fixing bolt so as to interfere with the joint hole (any one of the coupling hole and the first through hole) located on the inner side, and then, by tightening the fixing nut outside the first tube, The first tube and the connection tube can be fixed with high tightening force.

Wherein the inserting step of the fixing bolt is performed by inserting the end of the fixing bolt into the connecting hole at the end fixing part of the fixing bar; Wherein the folding washer is inserted into the connecting hole with the folding washer being positioned in a washer mounting portion having a thin section formed in the fixing bar so that the folding washer can be put in a folded state, It can be made simpler and easier by pushing the washer away from the washer mount.

Thus, the head of the fastening bolt and the folding washer can be inserted using the fastening bar without the operator manually putting the fastening bolt into the internal space of the first tube. An advantage that the process of inserting can be performed more accurately and error-free can be obtained.

Meanwhile, the connection tube is a tube used as a medium for connecting the first tube and the second tube, so that the other connection hole of the connection tube can be connected to the second through hole of the second tube. Here, the connection tube may be disposed inside the first tube and the second tube, or may be arranged to surround the outside of the first tube and the second tube.

Alternatively, the connecting tube may be a tube that is itself connected to the first tube in the longitudinal direction. In this case, since the end of the connecting tube must have a collapsed region with the first tube, the end of the connecting tube in the collapsed region is formed larger or smaller than the diameter of the first tube.

On the other hand, although the first tube and the second tube may be longitudinally connected through the connecting tube, the first tube and the second tube may be longitudinally connected to each other in a form other than the tube (e.g., a plate form).

The 'tube' described in the present specification and claims is defined as a member generally referred to as a member provided with a passage therein. Therefore, the cross section is circular or includes various shapes such as a square, and the material includes steel, plastic, concrete, and the like.

The 'joint hole' described in the present specification and claims includes all the holes into which a fixing bolt is inserted for a jointing process in a tube to be connected (including a connecting tube used as a medium for connecting tubes) define. That is, 'joint hole' includes 'first through hole', 'connection hole' and the like.

As described above, according to the present invention, the folding washer having the folded and bent head and the posture of the fixing bolt is inserted into the inner space through the joint hole and the through hole of the tube, and then the folding washer is spread, So that the clamping force is supported by the folding washer in the inner space of the tube. By tightening the fixing nut to the male thread of the fixing bolt protruding out of the tube, it is possible to securely fix the bolt with high tightening force It is possible to obtain an advantageous effect that the tube can be wound.

Accordingly, it is possible to obtain a favorable effect of constructing a civil engineering structure or a building structure by a tube by bolt fastening even in a region where stable supply of power is not possible, such as a high altitude zone.

That is, according to the present invention, since the joint hole and the through-hole of the tube can be fastened to the fixing bolt and the fixing nut outside the tube, the inner space of the tube is small enough that the operator can not enter, It is possible to obtain an effect that the tube joining operation can be successfully performed in the field with a simple process even if the joining process is performed.

According to the present invention, by inserting the fixing bolt into the through hole of the tube while attaching the fixing bolt to the end of the fixing bar and the other folding washer and the fixing nut on the fixing bar, It is possible to place the short fixing bolt, so that it is possible to reduce the error of missing the fixing bolt in the joining operation, and the operation becomes easier and the advantage can be obtained in a short time.

Particularly, the present invention uses a folding washer in which a self-expanding force is applied, thereby solving the conventional problem that it is difficult to unfold the folding washer while the folding washer is inserted into the tube, Regardless of proficiency, when the folding washer is inserted into the inside of the tube, it is possible to obtain a favorable effect of reducing the time and manpower required for the tube joining process and improving the accuracy of the work.

According to the present invention, since the protruding portion is provided from the plate surface of the folding washer, and the elastic ring of the closed ring is engaged with the closed loop-shaped elastic ring with the tensile displacement placed along the side face of the protruding portion, The self-expanding force acts on the elastic ring due to the resilient restoring force of the elastic ring even when the elastic ring is completely folded. As long as the elastic ring has tensile displacement, the self-expanding force . Furthermore, the folding washer can be reliably unfolded without being affected by the material of the tube to be joined, the material of the surrounding installation, and the like.

Further, in the present invention, since the holding bar for holding the folding washer in a folded state is provided on the fixing bar, in the process of inserting the folding washer into the fitting hole with the operator placing the folding washer in the washer holding portion of the fixing bar, It is possible to obtain an effect of solving the problem that the insertion into the joint hole is not smooth while being slightly opened.

According to the present invention, when the folding washer is inserted into the joint hole in a state where the folding washer is positioned on the washer mounting portion, the pusher pushes the folding washer away from the washer mounting portion, The folding washer is guided to unfold itself in the space inside the tube by pushing the folding washer so as to escape from the washer mounting portion, so that an easier and more convenient jointing process becomes possible.

1 is an exploded perspective view showing a tube arrangement for a joint structure of a general tube,
Figs. 2A and 2B are longitudinal sectional views showing a conventional structure for installing the joint structure of the tube of Fig.
FIG. 3 is an exploded perspective view of a joint fastener according to an embodiment of the present invention, FIG.
FIG. 4A is a side view showing a folded washer partially folded to be applicable to the present invention, FIG.
FIG. 4B is a side view showing the folded washer of FIG. 4A in an unfolded state,
4C is a side view showing the folded washer of FIG. 4A in its fully folded state,
FIG. 4D is a view showing the configuration of the folding washer of FIG. 4A except for the elastic ring and the connection pad;
FIG. 5A is a side view showing a fully folded state of another type of foldable washer applicable to the present invention, FIG.
5B is a side view showing a partially folded state of the folding washer 220 of FIG. 5A,
Fig. 5C is a side view showing the folded washer of Fig. 5A in an unfolded state, Fig.
5D is a view showing a configuration in which an expanding force acts in a partially folded state of another foldable washer 220 'that can be applied to the present invention,
6 is a view showing a state in which a joint is fastened to a fastening bar,
FIG. 7A is an enlarged view showing a configuration of the washer mounting portion 195 of FIG. 6,
FIG. 7B is an enlarged view showing the configuration of a washer mounting portion of another type of fixing bar applicable to the present invention; FIG.
Fig. 7C is an enlarged view showing the configuration of a washer mounting portion of another type of fixing bar applicable to the present invention, Fig.
FIG. 8 is a flow chart sequentially showing a tube joining method according to an embodiment of the present invention; FIG.
9A is a partial perspective view showing a configuration in which the first tube 10 and the connecting tube 30 are aligned,
FIG. 9B is a partial cross-sectional view along the section line VI-VI in FIG. 9A,
FIGS. 10A to 10F are views sequentially illustrating a tube fitting method according to an embodiment of the present invention using a joint fitting according to the present invention; FIGS.
11A is a longitudinal sectional view showing a state in which the first tube and the second tube are connected to each other via the connecting tube 30,
FIG. 11B is a vertical sectional view showing a state in which the connection tube 30 'is longitudinally attached to the first tube,
Figs. 11C to 11E are longitudinal sectional views showing a state in which the first tube is longitudinally passed through the connection tubes 30 "and 30"
Fig. 12 is a perspective view showing the configuration of the sealing washer of Fig. 3,
Fig. 13 is a view showing still another embodiment of the present invention, in which the structure of a fixing bolt, a fixing nut, etc. is excluded and a folding washer and a fixing washer are installed in a tube.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

3, the joint fastener 100 according to an embodiment of the present invention includes joint holes 10a, 10a, 10a, 10a, 10a, 10a, 10a, 10a, The fixing bolt 110 is provided with a head part 111 inserted into the connecting hole 30a and a fixing bolt 110 which is foldable or unfolded. The head part 111 of the fixing bolt 110 and the connecting part 10, 20 A fixed washer 130 which is in close contact with an outer wall of the jointing objects 10 and 20 and a threaded portion of the fixed bolt 110 which is in contact with the inner wall of the fixing bolt 110, A fixing nut 140 which engages the coupling objects 10, 30; 20, 30; a sleeve 160 which is fitted between the folding washer 120 and the fixing washer 130; And a sealing washer 170 interposed between the folding washer 120 and the fixing nut 140 at any position.

The fixing bolt 110 includes a head 111 formed to have a cross section through which the joint holes 10a and 20a and the coupling hole 30a can pass, And the body portion 112 is formed.

Here, the head part 111 is located in the inner space 30c through the joint holes 30a of the connecting body 30 and the joint holes 10a and 20a of the tubes 10 and 20 in the fastened state Is smaller than the diameters x1 and x2 of the connecting holes 10a and 20a and is formed to have a smaller diameter d1 than the diameter x3 of the connecting through hole 30a.

The body portion 112 extends from the head portion 111 and is formed with a predetermined length from the end portion of the male thread to be fastened to the fixing nut 140 on the outer circumferential surface. The fixing bolts 110 may be fixed at the ends of the fixing bars 190 to assist in maintaining the head 111 of the fixing bolts 110 in the state of being positioned in the jointing objects 10, have.

According to the present invention, the means for fixedly holding the fastening bolt 110 by the fastening bar 190 can be variously determined. 6, a non-circular engagement groove 191 may be formed at the end of the fixing bar 190 to fix the fixing bolt 110 (see FIG. 6) 110 may be temporarily inserted by inserting the non-circular protrusions 110a. Although not shown in the drawing, a receiving groove for receiving a protrusion formed at an end of the fixing bar 190 may be recessed and formed at an end of the fixing bolt 110. In addition, a female screw thread may be formed in the receiving groove of one end of the fixing bar 190 and an end of the fixing bolt 110, and a male thread may be formed in the other non-circular engaging groove to be temporarily engaged in a fastened state . In this case, the end of the fixing bar 190 is formed as a pivotable member rotatable with respect to the fixed bar body, and can be fixed or released in a locked state with the fixing bolt by rotating the pivoting member.

The folding washer 120 is connected to the two segment washers 121 and 122 by a connecting pad 123 or a hinge (not shown) so that the two segment washers 121 and 122 are completely And the two segment washers 121 and 122 may be overlapped and folded as shown in FIG. 4C. 4A shows a state where the two segment washers 121 and 122 are partially folded.

It is preferable that the segment washers 121 and 122 are formed by bisecting the folding washer 120. In the folding washer 120 of the present invention, however, the segmented washers 121 and 122 are necessarily divided into two halves .

The diameter d8 of the inner circumferential surface 120a of the folding washer 120 is formed to be larger than the diameter d9 of the trunk portion 112 of the fixing bolt 110 so that the folding washer 120 is fixed to the fixing bolt 110 But is smaller than the diameter d1 of the head 111 of the fixing bolt 110 so that the folding washer 120 interferes with the head 111 of the fixing bolt 110. [ The outer diameter d2 of the folding washer 120 is formed to be larger than that of the joint holes 10a and 20a and larger than that of the coupling hole 30a. It is interfered with the holes 10a and 20a and the connection through hole 30a.

Therefore, when the folding washer 120 is inserted into the inner space 30c of the joining objects 10 and 20 and is in the unfolded state, the inner peripheral portion of the folding washer 120 is inserted into the head portion 111 of the fixing bolt 110 The head portion 111 of the fixing bolt 110 and the folding washer 120 cooperate with each other so that the outer circumferential portion of the folding washer 120 interferes with the connecting object 10 or 20 or the connecting body 30. Therefore, And interferes with the inner wall of the objects 10 and 20 or the inner wall of the connector 30.

The protrusions 125 inserted into the fitting holes 10a, 20a and 30a are protruded from the plate surface facing the fitting holes 10a, 20a and 30a in a state in which the folding washer 120 is unfolded. The folding washer 120 can not be positioned in the joint holes 30a ... due to the interference between the protrusion 125 and the joint hole 30a at the position where the folding washer 120 is installed So that it can be positioned in a stable position. Here, the outer diameter of the projection 125 is formed to be slightly smaller than the joint hole inserted by the allowable positional displacement of the folding washer 120 (for example, 0.2 mm to 3 mm).

4D, the projecting portion 123 of the folding washer 120 protrudes in the form of a ring with respect to the washer body 124, and a seating portion 125a is recessed and formed on the outer peripheral surface of the projection 123, As shown in Figs. 4A to 4C, the elastic ring 128 is fitted in the seating portion 125a so as to have a tensile displacement. The elastic ring 128 is fitted in the protruding portion 123 in a state in which the contracting force for restoring the original length of the elastic ring 128 is always applied so that even when the elastic ring 128 is partially folded The segment washers 121 and 122 are completely retracted even when the elastic ring 128 is completely folded (Fig. 4C) until the self-expanding force Fr acts on the self- The force Fr that is to be unfolded by itself till the unfolded state (Fig. 4B) is reached.

Further, since the force Fr to which the folding washer 120 is to be deployed by itself acts on the elastic restoring force of the elastic ring 128, even if the material of the tubes 10, 20, 30 to be installed is metal, The folding washer 120 is always in a state in which the force Fr that is constantly deployed is applied, since it is not influenced by the material of the surrounding fixture.

As shown in the drawing, the connection pad 123 is attached in a ring shape to the entire surface of the ring-shaped segment washers 121 and 122 so that the segment washers 121 and 122, as shown in FIGS. 4A to 4C, 122 and the separating washers 121, 122 during the implementation of the folded, intermediate, and unfolded states of the split washers 121, 121, (I.e., a direction that is parallel but not located in the same plane), so that the folded and unfolded shape can be constantly realized. The present invention is not limited thereto and may be formed in a shape connecting only a part of the segment washers 121 and 122 or may be hinged to realize the folding and unfolding of the segmented washers 121 and 122.

4A, when the protrusions 120p and the groove 120c are engaged with each other on the contact surfaces of the split washers 121 and 122, the connection pads 121 contact the front surfaces of the segment washers 121 and 122 The protrusions 120p of the split washers 121 and 122 are prevented from being caught in the recesses 120c of the other divided washers 122 and 121 even if they are attached to only the connection portions of the segment washers 121 and 122 It is possible to suppress the twist deformation in the front end direction, so that the division washers 121 and 122 rotate only in a predetermined direction, and therefore, the operation is facilitated.

On the other hand, the connection pad 123 may be formed of a magnetic pad having a magnetic force. At this time, the magnetic force Fr acting on the magnet pad is formed so as to act as a force Fr that is pushed and spread in the direction in which the two segment washers 121 and 122 are separated from each other, as shown in Figs. 5B and 5E . That is, it is preferable that the outer surface of the magnet pad occupies the entirety of the N pole and the S pole. When the folding washer 120 is inserted into the inner space 30c of the joining object 10,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20, So that the operation can be simplified and the construction efficiency can be improved.

Separately or simultaneously, as shown in Figs. 5A to 5C, the magnet 120m may be installed on the surfaces of the segment washers 121 and 122 facing each other with the folding washer 220 fully extended . Here, the magnets 120m are installed in a direction in which the attracting force Fa works, but they may be provided on the opposite surfaces as a magnet, and a magnet is provided on one surface and a magnet A metal material to which attraction is applied may be provided. Thus, the folding washer 120 is provided with the magnet washers 121 and 122, which act on the surfaces of the segment washers 121 and 122 facing each other with the folding washer 120 fully extended, When the folding washer 120 is inserted into the inside of the joint hole 120, the folding washer 120 is completely unfolded in a state in which the folding washer 120 is inserted into the inside of the joint hole, The effect can be obtained.

The present invention can be applied to various types of folding washers 120, 220,... Shown in FIGS. 4A to 5E. Hereinafter, for convenience, the folding washers 120 of FIGS. 4A to 4C will be described as an example do.

10B, the fixing washer 130 is installed to improve the fastening force by uniformly distributing the tightening force of the fixing nut 140 from the outside of the joining objects 10, 20, .... In some cases, the fixing washer 130 may be omitted.

A protruding portion 135 inserted into the fitting holes 10a, 20a, ... is protruded from the surface of the fixing washer 130 facing the fitting holes 10a, 20a. Accordingly, the stationary washer 130 can be stably fixed in place in a state where the stationary washer 130 is in contact with the joint holes 10a, 20a, ....

The fixing nut 140 is fastened and fixed to the male thread 112x of the fixing bolt 110 by an operator outside the joining object 10, 20, .... In some cases, two or more of the fixing nuts 140 may be provided at the same time to minimize the loosening of the fixing nuts 140. [

The sleeve 160 is formed in a hollow cylindrical shape and is inserted into the joint hole to play a role of positioning the fixed washer 130 and the folding washer 120. It may be omitted if the tube to be joined is thin. The outer circumferential surface d6 of the sleeve 160 is sized to be inserted into the joint holes 10a, 20a and 30a and the inner circumferential surface of the sleeve 160 is fixed to the outer periphery of the trunk portion 112 of the fixing bolt 110 It is set slightly larger than the diameter.

12, the sealing washer 170 has a structure in which a capsule 175 containing a sealing material is disposed in the circumferential direction of the washer body 171, and a guide groove 171a Is extended. As the sleeve 160 is pressed against the sealing washer 170 and the pressing force is applied to the sealing washer 170 in the process of tightening the fixing nut 140 against the folding washer 120, A sealing material such as epoxy or silicone is discharged outside the radius on the guide groove 171a to fill the space between the joint holes 10a, 20a and 30a and the fixing bolt 110. [ Thus, rusting of the fixing bolt 110, the folding washer 120, the fixing washer 130, and the like can be prevented while preventing outside air or foreign matter from entering the inside of the tube.

Since the head portion 111 is formed in a small cross section through the joint holes 10a, 20a and 30a, the gap between the body portion 112 and the inner circumferential surfaces of the joint holes 10a, 20a and 30a is large, The fixing bolts 110 are held in parallel alignment with respect to the fitting holes 10a, 20a and 30a by inserting the sleeve 160 into the fitting holes 10a, 20a and 30a, So that the work required for the jointing process can be performed more conveniently and in a shorter time.

13, the folding washer 120 and the stationary washer 130 are fixed to the inner surface of the folded washer 120 and the stationary washer 130 in order to more firmly adhere to the surfaces of the tubes 10, The surfaces of the split washers 1211 and 1221 contacting the tubes 10 and 30 to be connected are formed as curved surfaces 1201s and 1301s having a curvature R similar to that of the tubes 10 and 30 . The folding washer 120 and the fixing washer 130 are more easily brought into close contact with the surfaces of the tubes 10 and 20 so that the tubes 10 and 30 The surface contact area of the tubes 10 and 30 can be secured to a greater extent, so that a firm connection can be achieved.

Meanwhile, the fixing bar 190 assists the fixing bolt 110 to keep the fixing bolts 110 over the joint holes 10a, 20a, And can form part of the joint fastener in a reusable form.

6, the fixing bar 190 extends forwardly and rearwardly of the handle gripped by the operator, and is fixed to the fixing nut 140 of the coupling joint 100, the fixing washer 130, the sleeve (not shown) The coupling protrusion 110a of the fixing bolt 110 is inserted into the non-circular coupling groove 191 at the tip in a state where the sealing washer 160, the sealing washer 170, and the folding washer 120 are hooked on the bar 195i near the handle. ). At this time, if at least one of the noncircular coupling groove 191 and the coupling protrusion 110a is formed of a magnet, the fixing bolt 110 made of a metal to which attraction is applied by the magnetic force can be more reliably held.

The stationary bar 190 is provided with a washer-receiving portion 195 as a stationary member 195b with a posture of the folding washer 120. 6, the washer mounting portion 195 is provided so that the folding type washer 120 can be placed in a folded state, and the position of the washer fixing portion 195 can be set to a predetermined value, Sectional width w1 as compared with the width w2 so that the folding washer 120 can be positioned in a folded state as shown in FIG.

The mounting member 195b of the washer mounting portion 195 is extended to a length allowing rotation 120r in which the folding washer 120 is disposed as shown in Fig. 10C. Therefore, when the folding washer 120 is folded, the height of the folding washer 120 becomes smaller than the diameters x1 and x2 of the joint holes 10a, 20a, It is possible to insert the folding washer 120 into the internal space 30c of the joining objects 10, 20, ...

At this time, it is very important to stably keep the folded washer 120 in the state where it is folded in the washer mounting portion 195 from the viewpoint of improving workability. 7A, the washer mounting portion 195 has a protruding member 195a formed with a larger width w2 than the width w1 of the mounting member 195b is fixed to the mounting member 195b. So that a part of the folding washer 120 is interfered with the bottom surface of the protruding member 195a to maintain the posture in a state where the folding washer 120 is nipped.

For example, in Fig. 7A, the stationary member 195b is inclined downward from the bottom surface at a position spaced rearward by a predetermined distance (x) from the tip of the axially extending projection member 195a, As shown in FIG. As a result, the rear end section where the mounting member 195b starts is provided with a projecting member 195a having a larger cross section on the upper side. The embodiment shown in Fig. 7A may be provided with an empty space 195v which is formed by being recessed axially rearward between the tip of the projecting member 195a and the mounting member 195b, while the upper side is interfered by the projecting member 195a However, as shown in Figs. 7B and 7C, the fixing member 195b may be extended from the tip of the projecting member 195a, so that no empty space may be provided. In the case of FIG. 7A in which the empty space 195v is provided, since the posture of the folding washer 120 can be fixed with the deep space inserted into the empty space 195v, the posture of the folding washer 120 can be more stably maintained The effect can be obtained.

7C, a holding member 195z may be provided at the end of the washer holder 195 to prevent the folding washer 120 from being opened again. The holding members 195z are used as a pair to accommodate the folded washer 120 so that the folding washer 120 is inserted into the fitting holes 10a, ..., 120 can be prevented from unintentionally unfolding.

6, when the fixing bolt 110 and the fixing nut 130 are fastened to the fixing bar 190, the folding washer 120 is pressed against the projecting member 190 of the washer mounting portion 195, And is fixed to the fixing bar 190 so as to stably maintain the posture. When the operator pushes the folding washer 120 to the washer mount portion 194 with the pusher 196 shown in Figs. 7A and 7B while pushing the fixing bar 190 into the fitting holes 10a, ..., 195).

To this end, the pusher 196 may be connected by a connecting member 194 to the trigger 192 of the fixed bar 190. Although the trigger 192 and the pusher 196 are illustrated as being connected directly to each other via a connecting member 194 in the figures, the pulling of the trigger 192 by the various link structures known in the art and the movement of the pusher 196 May be configured to be interlocked with each other. For example, the trigger 192 is provided so as to be reciprocally movable in a state of being elastically supported by a compression spring 190k, so that the trigger 192 is rotated before the folding washer 120 is positioned in the washer- When the trigger 192 is released after the folding washer 120 is inserted into the inside of the joint holes 10a ... 30a by the elastic restoring force of the compression spring 190k, The pusher 196 protrudes forward and pushes the folding washer 120 located in the washer mounting portion 195 forward. This allows the folding washer 120 to reliably move away from the washer mounting portion 195 by the pusher 196 even in the inside of the joint holes 10a, ..., 30a, Or folding the folding washer 120 by changing the posture, and it is possible to solve the problem that the work is not performed smoothly according to the skill of the operator.

At this time, the front upper surface of the stationary member 195b is formed as an upward sloped surface 195s. The folded washer 120 is moved upward by the pusher 196 while the folded washer 120 is moved forward by the pusher 196 while the folded washer 120 is maintained in the posture interfered with the bottom face of the protrusion member 195a. ), And the posture changes in the form in which the divided posture is set up by oneself.

As a result, when the force 196F applied by the pusher 196 acts, the folding washer 120 maintains the state where the posture is restrained by the protrusion member 195a in the washer mounting portion 195, 120 are moved forward, and the state restrained by the protruding member 195a is released, and the upper inclined surface 195s is set in a standing posture in a different posture. At this time, since the force Fr to be unfolded by the elastic ring 128, the magnet 120m or the like acts on the folding washers 120, 220, 220 ', and 220 ", the folding washers 120, And is deployed in a self-standing posture inside the holes 10a, ..., 30a.

Therefore, the process of connecting the two tubes 10, ..., and 30 by the fixing bar 190 configured as described above can be performed constantly and reliably irrespective of the skill of the operator.

Hereinafter, with reference to FIGS. 8 to 10F, a tube joining method (S100) according to the present invention will be described with reference to a configuration in which the first tube 10 and the second tube 20 are connected to each other using the connecting tube 30, ).

Step 1 : As shown in FIG. 9A, the connection tube 30 is inserted into the first tube 10 to be joined, and the first through holes 10a of the first tube 10 are inserted into the connection tube 30, The rotation position of the connection tube 30 is adjusted so that the connection tube 30 is aligned with the connection hole 30a of the connection tube 30 (S110).

Here, the diameter (x1) of the first through hole 10a and the diameter (x3) of the connecting through hole 30a may be determined to be the same, but may be slightly different. A diaphragm 15 is formed along the inner wall of the first tube 10 to assist in adjusting the end position of the connection tube 30 while reinforcing the flexural rigidity of the tube 10. [

9B, the connection through-hole 30a of the connection tube 30 is aligned with the first through-hole 10a of the first tube 10, as shown in FIG. 9B.

However, according to the embodiment of the present invention, the first bonding region 10z is formed around the periphery of the first through hole 10a to have a thickness thinner than the other regions, and the connection through- A connection junction region 30z formed to have a thickness thinner than other regions is formed around the periphery of the connection region 30z. Although the first junction region 10z and the connection junction region 30z are formed simultaneously in the figure, the junction regions 10z and 30z are formed only in the first tube 10 and the connection tube 30 . The joining regions 10z and 30z forming the thicknesses of the circumferential peripheries of the coupling holes 10a and 30a to be thinner are formed in such a manner that the joining regions 10z and 30z of the tubes 10 and 30, And may be formed in a shape formed by being recessed in at least one of the opposite surfaces of the tubes 10 and 30 facing each other, as shown in Fig.

Here, the bonding regions 10z and 30z are set in a range of 1.5 to 3 times the diameter of the joint holes 10a and 30a, which are formed by the first through holes and the connection holes. The thickness of the junction regions 10z and 30z is set to 0.3 to 0.7 times the thickness of the other regions.

Step 2 : The operator then grips the handle of the fixing bar 190 and fixes the fixing nut 140, the fixing washer 130, the sleeve 160, the folding washer 120 The folding washer 120 is interrupted by the retaining member 195z and the protruding member 195a in a folded state in the washer mounting portion 195 so that the posture is stably positioned As shown in FIG. In this way, by placing the folding washer 120 in the erected posture without positioning the folding washer 120 in the erected posture, an environment in which the folding washer can be inserted into the joint hole by inserting the fixing bar 190 .

Since the folding washer 120 is completely folded as shown in FIG. 4C or FIG. 5A, the force Fr to which the folding washer 120 is to spread by itself is relatively small, And the holding member 195z hold the posture and the folded state as they are.

At this time, since the folding washer 120 can stably maintain the posture in its folded state by the projecting member 195a and the holding member 195z in the washer mounting portion 195, 190), it is possible to work with one hand, so that it is possible to install the joint 100 in a direction toward the upper side, the work convenience is improved, and the worker's body It can be used for other work such as keeping it, so it can work safely and stable.

6, when the folding washer 120 is placed on the washer mounting portion 195, the trigger 192 of the fixing bar 190 is gripped And the pusher 196 is provided with an environment capable of introducing the pushing force 196F toward the washer mounting portion 195. [

Then, the protrusion 110a of the fixing bolt 110 is inserted into the groove 191 at the end of the fixing bar 190 and fixed (S120). The fixing bar 190 and the fixing bolt 110 are held in such a state that the front end of the fixing bar 190 is rotatable so that the fixing bolt 110 can be engaged by screwing. It is advantageous to temporarily fix the fixing bolt 110 by a magnetic force in view of improving workability.

Step 3 : Then, as shown in FIG. 10A, the fixing bar 190 is pushed into the connection through hole 30a with the first through hole 10a to insert the fixing bolt 190 into the head portion of the fixing bolt 110 111 to be inserted into the inner space 30c of the first tube 10 and the connecting tube 30 which are the objects to be joined (S130). The diameter d1 of the head part 111 is smaller than that of the joint holes 10a, 20a and 30a so that the fixing bolt 110 is positioned at the end of the fixing bar 190, . ≪ / RTI >

Step 4 : Then, as shown in FIG. 10B, the fixing bar 190 is further inserted into the joint holes 10a, 30a so that the folded washer 120 in the posture of being positioned in the washer mount portion 195, To the inner space 30c of the tubes 10 and 20 (S140).

Step 5 : Then, as shown in Fig. 10C, when the operator releases the trigger 192, the pusher 196 protrudes forward due to the elastic restoring force of the compression spring 190k, And pushes the folding washer 120, which has been placed on the washer 195, toward the front 120d of the washer mounting portion 195.

In this process, the folding washer 120 is raised while passing through the inclined upper surface 195s of the stationary member 195b of the washer mounting portion 195 while being rotated (rotated) in a standing position in the reclined position. In this process, the folding washer 120 is slightly folded as shown in Fig. 4B in the folded configuration shown in Fig. 4C. 4A, when the elastic force of the resilient ring 128 applied with a tensile force is applied, the segment washers 121 and 122 are in a fully collapsed state (Fig. 4C and Fig. 5a, the folded washer 120 is in its fully extended state in the form shown in Figures 4b and 5c.

At this time, if the folding washer is the shape 220, 220 ', or 220 "having the magnet pad 123 or the magnet 140m shown in FIGS. 5A to 5E, the repulsive force by the magnet pad 123, 120m), it is completely unfolded by itself.

Step 5 : The operator then retracts the fixing bar 190 to retreat 190d2 so that the projection 125 of the folding washer 120 is fitted into the connecting through hole 30a so that the folding washer 120 So that it can be stably positioned in the connection through-hole 30a.

10d, the operator pushes the sealing washer 170 and the sleeve 160 so that the sleeve 160 and the sealing washer 170 are inserted into the fitting holes 10a, 30a 160d, and 170d.

The gap between the body portion 112 of the fixing bolt 110 and the joint holes 10a and 30a is filled by the sleeve 160 when the gap between the inner wall of the joint holes 10a and 30a is large , The fixing bolt 110 can be held in a stable posture with respect to the axial direction within the joint holes 10a and 30a.

Then, as shown in FIGS. 10E and 10F, the fixing washer 130 is pushed (130d) into close contact with the outer wall of the first tube 10, so that the protrusion 135 of the fixing washer 130 is inserted into the fitting hole 10a, the position of the fixing washer 130 is fixed. Then, the fixing nut 140 is pushed (140d) into contact with the body 112 of the fixing bolt 110, and then the fixing nut 140 is rotated (140r) so that the female screw thread is screwed So that the fixing nut 140 is securely fastened.

In this process, the sealing washer 170 is sandwiched between the sleeve 160 and the protrusion 125 of the folding washer 120, and is subjected to the pressing force 140F upon fastening the fixing nut 140, The capsule 175 of the capsule 170 is blown and the sealing material such as epoxy or silicone in the capsule 175 flows along the guide groove 171a and flows in the direction perpendicular to the axis of the fixing bolt 110, And 30a and the body portion 112 of the fixing bolt 110, as shown in Fig. As a result, the external holes 10a and 30a are at least partly shielded from the external space of the tube 10 and the internal space 30c by the sealing material. Therefore, foreign substances or air are minimally introduced into the tube, It is possible to obtain an advantageous effect that the coupling force of the joint structure using the fastener 100 is ensured for a long time.

Meanwhile, the joint structure of the tube according to the present invention can be performed in a state in which the peripheral regions of the joint holes 10a and 30a of the tubes 10 and 30 are surface-processed to form junction regions 10z and 30z of a thinner thickness .

Since the first tube 10 and the connection tube 30 are connected to each other, the connection tube 30 must be inserted into the first tube 10, There is a minute gap (c) between them. When the first tube 10 and the connecting tube 30 are connected to each other by the bolt fastening method in the related art, there is a limit that the joint strength can be determined only by the shear resistance ability of the fixing bolt 110. [

However, according to the present invention, since the joining regions 10z and 30z forming the periphery of the joining holes 10a and 30a to be thinner are formed, the fixing bolts 110 are inserted into the joining holes 10a and 30a Plastic deformation of the joint regions 10z and 30z located between the folding washer 120 and the fixed washer 130 occurs while the fixing nut 140 is tightened with respect to the fixing bolt 110, 10 and the connection tube 30 are filled with the deformation of the joining regions 10z and 30z so that the joining regions 10z and 30z around the joining holes 10a and 30a are joined to each other The contact surface is brought into contact.

Therefore, the joint strength between the first tube 10 and the connection tube 30 is secured in addition to the shear resistance capability of the fixing bolt 110 by the frictional resistance of the contact surface due to the plastic deformation of the joint regions 10z and 30z , An advantageous effect of realizing a more rigid joint structure can be obtained.

Steps 2 to 5 are repeated for the first through hole 10a and the connecting through hole 30a in the overlapping region of the first tube 10 and the connecting tube 30, respectively. Thereby, the first tube 10 and the connection tube 30 are firmly connected.

Step 6 : Then, the second tube 20 is arranged so as to surround the connection tube 30 so that the second tube 20 and a part of the connection tube 30 are in a collapsed state. Next, the bolt fastening of the second through hole 20a of the second tube 20 to the connecting through hole 30a of the connecting tube 30 is performed by repeating the steps 1 to 5.

Thus, as shown in FIG. 11A, the first tube 10 and the second tube 20 can be connected firmly in the longitudinal direction without welding to the connecting tube 30 as an intermediate connector.

Reference numeral 25 denotes a diaphragm 25 formed along the inner wall of the second tube 20.

As described above, according to the present invention, the folding washer 120 folded at the head of the fixing bolt 110 is inserted into the inner space 30c through the joint holes 10a, 20a and 30a The folding washer 120 is unfolded and the clamping force is supported by the folding washer 120 in the inner space 30c of the tube so that the fixing nut 110x is fixed to the male thread 112x of the fixing bolt 110 protruding out of the tube. 20, 30 'with high tightening force by means of bolting while eliminating welds, thereby preventing the supply of stable power, such as a high alpine zone, , It is possible to obtain a favorable effect of being able to construct a civil engineering structure or a building structure by a tube by bolting.

In addition, the present invention stably maintains the fixing bolt 110 in a fixed position using the fixing bar 190, so that it is possible to reduce the error of missing the fixing bolt 110, The folding washers 120, 220, ... in which the forces Fr act on the washers 121 and 122 are applied to the inner spaces 30c of the tubes 10, The process of unfolding the washer 120 is facilitated, so that the joining operation is facilitated irrespective of the skill of the operator and the process advantage that can be performed in a short time can be obtained.

As described above, according to the present invention, the joint hole 30a and the through-holes 10a and 20a of the tube are fixedly coupled with the fixing bolt 110 and the fixing nut 140 from the outside of the tubes 10, 20 and 30 ' It is possible to obtain an enlargement effect of the application in which the inner space of the tube can be made small enough that the operator can not enter the tube or the jointing process can be carried out with an easy process even if the jointing process is performed with the tube standing up .

In the embodiment of the present invention illustrated in the drawing, a connection tube 30 is disposed inside the first tube 10 and the second tube 20, According to another embodiment of the present invention, the connection tube 30 is connected to the outside of the first tube 10 and the second tube 20 in the longitudinal direction, To connect the first tube 10 and the second tube 20 in the longitudinal direction via the connecting tube 30. [

According to another embodiment of the present invention, a plate-shaped connecting body (not shown), which is not a tubular body, is superimposed on the first tube 10 and the second tube 20, The first tube 10 and the second tube 20 are connected to the through holes 10a and 20a of the tubes 10 and 20 by using a joint 100 similar to steps 1 to 5. [ In the longitudinal direction.

11B, according to another embodiment of the present invention, the cross section of the end of the other connecting tube 30 'with respect to the first tube 10 is formed to be larger or smaller, The first tube 10 and the connecting tube 30a are connected to each other through the first through hole 10a and the connecting through hole 30a in the region of the tube 10 and the connecting tube 30 ' Lt; RTI ID = 0.0 > 30 '. ≪ / RTI > In this case, the connecting tube 30 'serves as the second tube 20.

The connection tubes 30 ', 30 ", 30"' for connecting the first tube 10 and the second tube 20 may also be applied in various forms as shown in FIGS. 11c-11e have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. That is, in the above-described embodiment, the fixing bolts 110 are fixed to the fixing bar 190 and the tubes 10, 20 and 30 'are longitudinally connected to the coupling joint 100. However, Even if the inconvenience is incurred, it is also within the scope of the present invention to connect the tubes 10, 20 and 30 'in the longitudinal direction by using the coupling fitting 100 without using the fixing bar 190.

10: first tube 20: second tube
10a: first through hole 20a: second through hole
30: connecting tube 30a: connecting through hole
100: fastener 110: fastening bolt
111: head part 112: body part
110a: receiving groove 120: folding washer
123: magnetic pad 130: washer
140: Fixing nut 170: Sealing washer
190: fixed bar 192: trigger
195: Washer mounting portion 195a:
195b: mounting member 195z: holding member
196: Pusher

Claims (17)

A fastener for use in joining a tube,
A fixing bolt having a head portion having a small cross section as compared with the joint hole and a body portion extending in a small cross section with respect to the head portion and having a male screw thread;
A folding washer which interferes with the joint hole in an unfolded state but is passed through the joint hole when the folded state is changed to a posture;
A fixing nut fastened to a part of the body part located outside the joint hole in a state where the head part and the folding washer are inserted into the joint hole;
A washer holding portion having an end fixing portion for fixing the fixing bolt in a state where the end of the fixing bolt is fastened and a fixing member having a thin section so as to be able to hang the folding washer in a folded state; And a pusher having a pusher for pushing the folding washer away from the washer mount when the folding washer is inserted into the joint hole with the folding washer being positioned on the pushing member;
Wherein the first and second fastening members are formed by joining together.
The method according to claim 1,
Wherein the folding washer has a self-expanding force.
The method according to claim 1,
The folded washer is divided into two, and the segment washers are connected to each other by using a magnetic pad having a magnetic force acting as a connection pad. By the magnetic force, a force for self-spreading by the repulsive force in the mutual expansion direction acts And a coupling member
The method according to claim 1,
The folding washer is divided into a first segment washer and a second segment washer, and a contact surface of the first segment washer and the second segment washer, which are in contact with each other with the folding washer unfolded, And a force for unfolding itself is applied.
3. The method of claim 2,
The folded washer is formed such that the divided first segment washer and the second segment washer are connected to each other to be capable of being folded and unfolded, and in a completely unfolded state, the first segment washer and the second segment washer Wherein a protruding portion is formed in a ring shape on the surface of the folding washer facing the joint hole so as to surround the outer peripheral surface of the protruding portion in a state in which the elastic ring in the form of a closed loop is stretched, Wherein the first segment washer and the second segment washer are resilient restoring forces, and the first segment washer and the second segment washer are joined by the resilient restoring force of the resilient ring surrounding the protrusion spaced from the center of rotation in which the first segment washer and the second segment washer rotate, Wherein the fastening member is fully opened in the hole.
6. The method of claim 5,
Wherein the projecting portion is inserted into the joint hole, and the elastic ring is a rubber band.
6. The method of claim 5,
And a groove for receiving the elastic ring is formed along the circumferential direction on the outer circumferential surface of the protruding portion.
6. The method of claim 5,
Wherein the first segment washer and the second segment washer are connected to each other by a connection pad or a hinge at the center of rotation and folded or unfolded.
6. The method of claim 5,
The folded washer is formed with a protrusion and a groove that engage with each other on the side where the first segment washer and the second segment washer are in contact with each other. When the folding washer is unfolded, the resilient restoring force of the elastic ring Wherein the folding washer is held in an unfolded state by interference.
The method according to claim 1,
And a sleeve for surrounding the fixing bolt is interposed between the folding washer and the fixing nut.
The method according to claim 1,
A fixing washer formed between the tube and the fixing nut, the protrusion being inserted into the coupling hole;
Further comprising:
The method according to claim 1,
Wherein a surface of at least one of the folding washer and the fixing washer is in contact with the tube is curved.
The method according to claim 1,
A sealing washer having a capsule containing a sealing material is interposed between the folding washer and the fixing nut and the capsule is blown by a pressing force for tightening the fixing nut so that the sealing material seals the periphery of the fixing bolt To -
The method according to claim 1,
Wherein the washer mounting portion is formed with a holding member for contacting the folded surfaces of the folding washer and holding the folded washer in a folded state.
The method according to claim 1,
Wherein the washer mounting portion includes a section in which a protruding member formed to have a larger width is disposed on the upper side of the stationary member.
16. The method of claim 15,
Wherein the mounting member is provided with an area extending obliquely downwardly from a position spaced rearwardly from a front end of the protruding member so that an empty space is formed between the protruding member and the mounting member.
16. The method of claim 15,
Wherein the mounting member has an upwardly inclined surface formed on a front upper surface thereof.

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