JP2009138408A - Mechanical joint of reinforcing bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heighten the connecting force between a reinforcing bar and a sleeve. <P>SOLUTION: A spiral spring member 3 is interposed between the outer periphery of a deformed reinforcing bar 1 and the inner periphery of the sleeve 2. The outer periphery of the spring member 3 is screwed to a spiral recessed groove 11 provided on the inner periphery of the sleeve 2 to mechanically connect both members to each other. Since the inner periphery of the spring member 3 is opposite to a bamboo joint 11 projected on the deformed reinforcing bar 1, both of them are firmly connected to each other through a grout to exhibit strong resisting force against drawing of the deformed reinforcing bar. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mechanical joint for reinforcing bars that connects ends of reinforcing bars.

Conventionally, as a means for connecting reinforcing bars arranged in concrete to each other in the longitudinal direction, the ends of the reinforcing bars are inserted into a cylindrical sleeve, and the inner peripheral side of the cylindrical sleeve is filled with grout. Many means for connecting the ends of deformed reinforcing bars have been proposed (for example, see Patent Documents 1 to 4).
Japanese Patent No. 3954991 (Fig. 3 etc.) Japanese Patent No. 23278308 (FIG. 1 etc.) Japanese Utility Model Publication No. 06-082232 (Fig. 1 etc.) Japanese Unexamined Patent Publication No. 63-007453 (FIG. 2 etc.)

  None of the above-mentioned reinforcing bar connecting means mechanically connect the reinforcing bar and the sleeve directly, and the sleeve takes charge of the tensile load applied to the reinforcing bar via the filled grout. For this reason, if the fixing force between the outer periphery of the reinforcing bar and the grout and the fixing force between the inner periphery of the sleeve and the grout are not sufficient, even if the tensile strength of the sleeve is designed to be sufficiently high, the reinforcing bar may be pulled out of the grout, or The grout is peeled off from the inner periphery of the sleeve and separated from the butt surface of the reinforcing bar. Therefore, in order to increase the fixing force between the outer periphery of the reinforcing bar and the inner periphery of the sleeve and the grout, it is necessary to lengthen the sleeve or to reduce the gap between the outer periphery of the reinforcing bar and the inner periphery of the sleeve.

  However, if the sleeve is lengthened, not only will the manufacturing cost of the sleeve increase, but it will also take time to fill the grout. If the gap between the outer diameter of the reinforcing bar and the inner diameter of the sleeve is reduced, it becomes difficult to fill the gap with no grout.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mechanical joint for a reinforcing bar that can increase the connecting force between the reinforcing bar and the sleeve.

  In order to solve the above problems, the mechanical joint of the reinforcing bar according to the present invention is characterized in that a spiral spring member is interposed between the outer periphery of the deformed reinforcing bar and the inner periphery of the sleeve, and the outer periphery of the deformed reinforcing bar and the spring member are grouted. The spring member is screwed into a spiral groove provided on the inner periphery of the sleeve, and the spring member and the sleeve are mechanically directly connected.

  That is, the mechanical joint of a reinforcing bar according to the present invention is a mechanical joint that connects the ends of two deformed reinforcing bars, and includes a cylindrical sleeve and a spiral spring member. A spiral concave groove in which the spring member can be screwed is formed on the inner periphery of the sleeve. Then, when connecting the ends of the two deformed reinforcing bars, the spring member is first screwed into the groove of the sleeve, and then the ends of the deformed reinforcing bars are attached to the inner periphery of the spring member. Finally, grout is filled into the inner peripheral side of the sleeve.

  With this configuration, first of all, the spring member can be screwed into a concave groove provided on the inner periphery of the sleeve to mechanically connect both the sleeve and the spring. The connecting force with the member can be dramatically increased. Furthermore, since the spring member mechanically fixed to the sleeve surrounds the outer periphery of the deformed reinforcing bar, the gap between the inner periphery of the sleeve and the outer periphery of the deformed reinforcing bar becomes narrow, and the deformed reinforcing bar The outer periphery and the spring member can be firmly fixed through the grout.

  In addition, each bamboo node protruding from the outer periphery of the deformed reinforcing bar and the spiral spring member are arranged to face each other. For this reason, the deformed reinforcing bar bamboo joint and the spiral spring member have a great resistance to pulling out of the grout, and the deformed reinforcing bar and the spring member are as strong as if they were mechanically integrated together. Fixed to.

  Here, the “cylindrical sleeve” means a member having a predetermined length having a through hole in the shaft core, and corresponds to, for example, a metal pipe such as iron, or a cast or forged product. “Mechanical joint” means a joint in which the ends of two reinforcing bars are brought together and both ends are connected by a sleeve. As means for connecting both ends with a sleeve, there are screws, crimping, grout filling, etc., but in the present invention, means means by grout filling. The “spiral spring member” means a metal linear member such as iron wound spirally with the same radius and the same pitch around a linear axis. The cross-sectional shape of the linear member is not limited to a circle but also includes a polygon such as a hexagon.

  The “spiral-shaped concave groove into which the spiral-shaped spring member can be screwed” includes not only a case where the groove diameter of the concave groove is equal to the outer diameter of the spring member but also a small groove. This is because, since the spring member is literally an elastic body, the outer circumference can be reduced in diameter at the time of screwing. Moreover, as a cross-sectional shape of a ditch | groove, V shape, U shape, a rectangle, or a trapezoid corresponds, for example. The groove width of the concave groove is preferably larger than the wire diameter of the spring member. This is because it is easier to screw the spring member into the spiral groove, and it is possible to cope with a change in the pitch interval of the spring member when the diameter of the spring member is reduced. Even if an axial gap is generated between the groove and the spring member, if the filled grout is solidified, a fixing force equivalent to the case where the groove and the spring member are mechanically connected can be obtained. The spiral groove is formed by pressing and rolling the outer periphery of the sleeve if the sleeve is a pipe, and is formed by casting using a core if the sleeve is a cast product. If it is a forged product, it can be formed by cutting or the like.

  By the way, the present inventor makes two spiral spring members, superimposes the two spring members so that their axial centers intersect with each other, and screws them into the spiral concave groove of the sleeve. It has been found that the connection force between the reinforcing bar and the sleeve can be further increased when configured.

  In other words, the mechanical joint of the reinforcing bar according to the present invention is characterized in that the spring member is two spring members having the same shape, and the ends of the two deformed reinforcing bars are connected to each other. The sleeve is inserted in advance, and the two spring members are overlapped so that the shaft cores cross each other, and the outer periphery of the two spring members is respectively aligned so that both shaft cores are coincident with each other. By pressing, the end portions of the deformed reinforcing bars are inserted into the through passage formed by overlapping the inner peripheries of the two spring members so that the outer peripheries of the two spring members The two spring members are screwed into the concave grooves of the sleeve while pressing so that the shaft cores coincide with each other, and grout is filled on the inner peripheral side of the sleeve.

  The operation of the present invention will be described in detail with reference to the drawings in “Best Mode for Carrying Out the Invention” to be described later. That is, when the two spring members are overlapped with each other, the respective spring members come into contact interference with each other, and the outer circumferences of the respective spring members need to be pressed in order to make both axial centers coincide. On the other hand, when the two spring members are overlapped, the inner circumferences of the two overlap, and a so-called through path is formed by crushing the circular shape from the left and right, as if the two arcs are overlapped. The penetration path approaches a circular shape as it approaches the state in which the axial centers of the two spring members coincide.

  Therefore, if the outer periphery of the spring member 2 is pressed to make the through path close to a circular shape, both ends of the reinforcing bar can be inserted into the through path. And after inserting a reinforcing bar into a penetration way, two spring members which mutually interfere try to separate from each other by elastic restoring force. In this case, the through path has a cross-sectional shape that is crushed from a circular shape, and the inner periphery of the spring member sandwiches the outer periphery of the reinforcing bar. On the other hand, the outer periphery of each of the two spring members also tends to move outward due to the elastic restoring force, and is thus pressed against the inner periphery of the sleeve.

  Therefore, since the inner periphery of the two spring members that interfere with each other is sandwiched between the bamboo bars of the deformed reinforcing bars, it is as if the deformed reinforcing bars and the spring members are mechanically connected directly, More strengthened. Note that the outer periphery of the spring member is also screwed together while being pressed by the concave groove provided in the inner periphery of the sleeve, so that both are more firmly connected.

  Even if the inner circumference of the sleeve and the diameter of the spring member are formed larger than the outer diameter of the reinforcing bar, as described above, the spring member can be separated from the outer circumference of the reinforcing bar and the inner circumference of the sleeve by the elastic restoring force. Respectively. Therefore, even if the outer diameters of the reinforcing bars are somewhat different, the spring member and the sleeve having the same shape can be used.

  Furthermore, the present inventor, when there are two spring members, by reducing the diameter of the opening at both ends of the sleeve without providing a spiral groove on the inner periphery of the sleeve, It was found that the connection power of can be increased.

  In other words, the mechanical joint of the reinforcing bar according to the present invention is characterized in that the inner periphery of the sleeve has a circular cross-sectional shape in which the spiral groove is not formed, and the openings at both ends of the sleeve are respectively formed in the sleeve. The diameter is smaller than the inner circumference. Then, when connecting the ends of the two deformed reinforcing bars, the sleeve is inserted in advance into one of the two deformed reinforcing bars, and the two spring members are arranged so that their axes intersect each other. By superposing and pressing the outer periphery of the two spring members so that both axial centers coincide with each other, the inner periphery of each of the two spring members overlaps the through passage formed by overlapping the deformed reinforcing bars. Insert the two spring members into the inner circumference of the sleeve while pressing the outer circumferences of the two spring members so that the axial centers of the two springs coincide with each other. It is to fill grout on the inner peripheral side of the sleeve.

  That is, as described above, the outer circumferences of the two spring members are pressed against the inner circumference of the sleeve by its own elastic restoring force even when the spiral concave groove is not formed on the inner circumference of the sleeve. Can do. Further, after filling with the grout, the spring member is surrounded by the solidified grout, so that the spring member does not shrink in diameter or shrink in the axial direction. On the other hand, the openings at both end portions of the sleeve are formed to have a diameter smaller than the inner circumference of the sleeve, so that the spring member that does not shrink and does not shrink cannot escape from the openings at both end portions of the sleeve. Therefore, the connecting force between the reinforcing bar and the sleeve can be increased by reducing the diameter of the opening at both ends of the sleeve without providing a spiral concave groove on the inner periphery of the sleeve.

  Here, the “openings at both ends of the sleeve” are not limited to the case where the inner diameters of both ends of the sleeve are reduced, but a member having an opening hole smaller than the inner peripheral diameter of the sleeve is welded, screwed, etc. This includes the case where both ends are connected.

  The rebar mechanical joint according to the present invention can achieve the following effects. That is, firstly, by screwing the spring member into the concave groove provided in the inner periphery of the sleeve, both of them can be mechanically directly connected, and thereby the connection force between the sleeve and the spring member is It can be increased dramatically. Furthermore, since the spring member mechanically fixed to the sleeve surrounds the outer periphery of the deformed reinforcing bar, the gap between the inner periphery of the sleeve and the outer periphery of the deformed reinforcing bar becomes narrow, and the deformed reinforcing bar The outer periphery and the spring member can be firmly fixed through the grout. In addition, each bamboo node protruding from the outer periphery of the deformed reinforcing bar and the spiral spring member are arranged to face each other. For this reason, the deformed reinforcing bar bamboo joint and the spiral spring member have a great resistance to pulling out of the grout, and the deformed reinforcing bar and the spring member are as strong as if they were mechanically integrated together. Fixed to.

  When two spiral spring members are used, the inner periphery of the two spring members that interfere with each other is sandwiched between the bamboo bars of the deformed reinforcing bars, so that the deformed reinforcing bars and the spring members are mechanically connected. It will be in the state connected directly, and both connection powers are strengthened more. In addition, since the outer periphery of the spring member is also screwed while being pressed by the concave groove provided in the inner periphery of the sleeve, both coupling forces are further strengthened. Even if the inner circumference of the sleeve and the diameter of the spring member are made larger than the outer diameter of the reinforcing bar, the spring member is restrained by the elastic restoring force on the outer circumference of the reinforcing bar and the inner circumference of the sleeve, respectively. The Therefore, even if the outer diameters of the reinforcing bars are somewhat different, the spring member and the sleeve having the same shape can be used.

  In addition, when two spiral spring members are used, the diameter of the opening at both ends of the sleeve is reduced to reduce the distance between the reinforcing bar and the sleeve without providing a spiral groove on the inner periphery of the sleeve. The coupling force can be increased.

  With reference to FIGS. 1-6, the structure of the mechanical joint of the reinforcing bar by this invention is demonstrated. As shown in FIG. 1, the mechanical joint of a reinforcing bar according to the present invention is a mechanical joint that connects the ends of two deformed reinforcing bars 1, 1, and includes a cylindrical sleeve 2 and a spiral spring member 3. And. Bamboo nodes 11 protrude from the outer periphery of the deformed reinforcing bar 1 at predetermined pitch intervals. The sleeve 2 is made of an iron cylindrical pipe, and a spiral concave groove 21 into which the spring member 3 can be screwed is formed on the inner periphery thereof.

  The spiral concave groove 21 has a substantially trapezoidal cross-sectional shape, and a jig is pressed against the outer periphery of the sleeve 2 made of a cylindrical pipe to form a U-shaped cross-sectional groove 22 in a spiral shape. It is formed by forming a circular arc-shaped protrusion 23 around the periphery in a spiral shape. The spiral concave grooves 21 are formed at both ends of the sleeve 2 leaving a predetermined length. The spring member 3 is obtained by winding a steel wire rod by drawing in a spiral shape with the same radius and the same pitch interval with a straight line as the central axis, and the cross-sectional shape of the wire member is circular. The outer diameter of the spring member 3 is substantially the same as or slightly larger than the groove diameter of the concave groove 21 of the sleeve 2, and the inner diameter of the spring member is deformed reinforcing bar in a state of being screwed into the concave groove of the sleeve. One bamboo knot 11 is formed in a size that can be inserted.

  Holes 4 and 4 for grout injection and air bleed are provided on the outer periphery in the vicinity of both ends of the sleeve 2, respectively. Further, seal members 5 and 5 are attached to both ends of the sleeve 2 to prevent the injected grout from leaking outside. The seal member 5 includes a flange portion 51 made of an iron sheet metal member and a rubber plate member 52 whose outer periphery is fitted to the inner periphery of the flange portion. An opening hole substantially the same as the inner periphery of the sleeve 2 is provided at the center of the flange portion 51, and the outer diameter of the deformed reinforcing bar 1 with the bamboo joint 11 is approximately the same as the inner diameter of the rubber plate member 52. An opening hole is provided. A female screw is screwed on the inner periphery of the flange portion 51, and the female member is screwed to a male screw formed on the outer periphery of the sleeve 2, whereby the seal member 5 is fixed to both ends of the sleeve. The rubber plate member 52 is sandwiched between the end surface of the sleeve 2 and the inner side surface of the flange portion 51.

  Next, the use of the mechanical joint for reinforcing bars according to the present invention will be described with reference to FIG. Now, when connecting the ends of the two deformed reinforcing bars 1, 1, the spring member 3 is first inserted into the sleeve 2 while being screwed into the groove 21. As described above, the outer diameter of the spring member 3 is substantially the same as or slightly larger than the groove diameter of the concave groove 21 of the sleeve 2. However, since this spring member is an elastic member, the outer diameter of the spring member 3 is not limited. Can be easily screwed into this concave groove. Next, as described above, the inner diameter of the spring member 3 is formed such that the bamboo knot 11 of the deformed reinforcing bar 1 can be inserted in a state where the inner diameter of the spring member 3 is screwed into the concave groove 21 of the sleeve 2. The deformed reinforcing bar is inserted into the inner periphery of the spring member so that the ends of the deformed reinforcing bar face each other at a substantially central position in the longitudinal direction.

  Next, grout such as mortar is injected from one of the holes 4 provided on the outer periphery of the sleeve 2 until the grout flows out from the other hole or the like. Since the seal member 5 is provided at both ends of the sleeve 2, it is possible to prevent the grout from leaking out from both ends of the sleeve.

  FIG. 2 shows a mechanical joint of a reinforcing bar using two spiral spring members 103A and 103B. The other components 102, hole 104, and seal member 105 are the same as those described above with reference to FIG.

  Next, the use and operation of the mechanical joint of the reinforcing bar shown in FIG. 2 will be described in detail with reference to FIGS. Now, when connecting the ends of the two deformed reinforcing bars 101, 101, first, the sleeve 102 is inserted in advance into one of the two deformed reinforcing bars. Next, as shown in FIG. 4, the two spring members 103A and 103B are overlapped so that the shafts 131A and 131B intersect each other. In this way, the axes 131A and 131B are overlapped so that the axes 131A and 131B cross each other. If the two spring members 103A and 103B are to be overlapped with each other in a state where the axes are parallel to each other, both spring members strongly interfere with each other. This is because it becomes difficult to bring the spring members close to each other when the axial centers of the spring members coincide.

  On the other hand, as shown in FIG. 4, when the two spring members 103A and 103B are overlapped so that the shaft cores 131A and 131B cross each other, the interference between both spring members becomes weak, and the two shaft cores of the spring members are It becomes easy to approach when they match. About the difference of this effect | action, when the two spring members are actually tried to overlap, the following will be found. That is, when the two spring members 103A and 103B are placed in parallel on a plane such as a desk and both the shaft cores 131A and 131B are kept close to each other while being kept parallel, one pitch of one spring member 103A is seen from above. A substantially V-shaped portion as viewed from above, which is composed of minutes, enters a V-shaped portion of the other spring member 103B. In this state, when both shaft cores 131A and 131B are brought closer, the V-shaped part of one spring member 103A and the V-shaped part of the other spring member 103B come into contact with each other. Even if the outer peripheries of both spring members are pressed, it becomes impossible to bring both axial cores 131A and 131B closer to each other.

  On the other hand, as shown in FIG. 4, the two spring members 103A and 103B are overlapped so that the shaft cores 131A and 131B cross each other, and then both springs are aligned so that both the shaft cores coincide. When the outer periphery of the member is pressed with the pressing force F, one spring member 103A can ride on the other spring member 103B (front side when viewed from above), and the two cores can be brought close to each other. That is, when the two spring members 103A and 103B are overlapped so that the shaft cores 131A and 131B cross each other, one spring member 103A gradually rides on the other spring member 103B, Approaches the axis. Such an action can always be reproduced regardless of the intersecting position even if the two spring members 103A and 103B intersect at the end portion or the central portion of the spring member.

  In FIG. 5, the two spring members 103A and 103B are overlapped so that the shaft cores 131A and 131B cross each other, and then the outer circumferences of both spring members are pressed by the pressing force F, so Shows a state in which One spring member 103A rides on the other spring member 103B. FIG. 6 shows a case where the two spring members 103A and 103B in the state shown in FIG. 5 are viewed from the direction of the axis 131A and 131B. As apparent from FIG. 6, the one spring member 103A rides on the other spring member 103B, whereby the shaft core 131A of one spring member moves upward from the other shaft core 131B. is doing.

  Now, as shown in FIG. 6, when the inner peripheries of the two spring members 103A and 103B overlap, a tube passage 103C is formed. The tube passage 103C has a shape in which two circular arcs are overlapped, that is, a shape in which a circular shape is crushed from the lateral direction, and the shaft cores 131A and 131B of the two spring members coincide with each other in the through passage. The closer to the state, the closer to the circular shape, and the end of the deformed reinforcing bar 101 having a circular cross-sectional shape can be inserted into this through-passage.

  By the way, as described above, in order to bring the shaft cores 131A and 131B of the two spring members 103A and 103B closer to the coincident state, the outer periphery of the two spring members is pressed and the two spring members are elastically deformed. It is necessary to let Therefore, in the state shown in FIG. 6, when the end of the deformed reinforcing bar 101 is inserted into the pipe passage 103C and the pressing of the axial cores 131A and 131B of the two spring members 103A and 103B is released, the two spring members are By the restoring force R, it tries to leave in the left-right direction in FIG. Here, more accurately speaking, the action of leaving the left and right direction means that the shaft cores 131A and 131B of the two spring members 103A and 103B are restored from the parallel state to the intersecting state. That is, the restoring force R acts so that both ends of the two spring members 103A and 103B are separated from each other around the axial center portion of the spring member.

  Now, if the two spring members 103A and 103B are about to be separated in the left-right direction, the width of the tube passage 103C becomes narrower in FIG. 6, which means that the outer periphery of the deformed reinforcing bar 101 inserted into this tube passage is This means that the inner circumference of the two spring members is pressed with the restoring force R in the left-right direction. Therefore, the spring members 103A and 103B can bite between the bamboo bars 111 of the deformed reinforcing bar 101, and can strongly counter the pulling force in the longitudinal direction of the deformed reinforcing bar 101. On the other hand, the two spring members 103A and 103B have the shafts 131A and 131B restored from the parallel state to the crossed state as described above, so that both end portions of the two spring members are left and right in FIG. Move to. Therefore, the outer circumferences of both end portions of the two spring members 103A and 103B are pressed against the inner circumference of the sleeve 102 by the restoring force R, and can be screwed into the concave groove 121 more firmly.

  As described above, since the two spring members 103A and 103B are pressed against the outer periphery of the deformed reinforcing bar 101 and the inner periphery of the sleeve 102 by the restoring force R, the connecting force between the deformed reinforcing bar and the sleeve is greatly increased. It becomes possible. Further, even if the outer peripheral diameter of the deformed reinforcing bar 101 is somewhat reduced, the pressing effect by the restoring force R is maintained. Therefore, even if the outer peripheral diameter of the deformed reinforcing bar is different, the same spring members 103A and 103B and the sleeve 102 are used. Can be used.

  Next, FIG. 3 shows a configuration in which a sleeve 202 that does not form a groove on the inner periphery is used. In addition, the deformed reinforcing bars 201, 201, and the spring members 203A, 203B, etc., which are other components, are equivalent to the components described above with reference to FIG. In the sleeve 202, both ends 224 and 224 of the steel pipe having a circular cross section are reduced in diameter by a die or the like, and openings 226 and 226 having a diameter smaller than the inner periphery 225 of the sleeve are formed.

  The use of the mechanical joint of the rebar shown in FIG. 3 is substantially the same as the mechanical joint described above in FIG. That is, when connecting the ends of the two deformed reinforcing bars 201, 201, the sleeve 202 is inserted in advance into one of the two deformed reinforcing bars, and the two spring members 203, 203 are crossed with their axes. In such a manner, the outer circumferences of the two spring members are respectively pressed so that the axial centers of the two spring members coincide with each other, so that the inner circumferences of the two spring members overlap with each other. It inserts so that the ends of this deformed reinforcing bar may touch each other. Then, the two spring members 203 are inserted into the openings 226 and 226 of the both end portions 224 and 224 of the sleeve 202 while pressing the outer circumferences of the two spring members 203 and 203 so that the axial centers of the two springs coincide with each other. . Finally, grout such as mortar is filled from the hole 204 to the inner periphery 225 side of the sleeve 202.

  As in the case described above, the inner periphery of the second spring members 203, 203 presses the outer periphery of the deformed reinforcing bar 201 with a restoring force, and firmly connects the two. On the other hand, the outer circumferences at both ends of the two spring members 203 are in close contact with each other by pressing the inner circumference 225 of the sleeve 202 with a restoring force. When the grout filled in this state is solidified, it becomes difficult for the two spring members 203 to be reduced in diameter and in the longitudinal direction. Therefore, both ends of the spring member 203 are constrained by the openings 226 of the both end portions 224 to prevent the spring member from moving relative to the sleeve 202 in the axial direction.

  As described above, since the two spring members 203A and 203B are pressed against the outer periphery of the deformed reinforcing bar 201 and the inner periphery of the sleeve 202 by the restoring force R, the connecting force between the deformed reinforcing bar and the sleeve is greatly increased. It becomes possible. If the diameters of the openings 226 and 226 provided at both ends 224 and 224 of the sleeve 202 are formed larger than the outer diameter of the deformed reinforcing bar 201, the outer diameter of the deformed reinforcing bar may be slightly different. The same sleeve and spring members 203A, 203B can be used. In such a case, the seal member 5 shown in FIG. 1 is configured to be attached to both end portions 224 and 224 of the sleeve 202 to prevent leakage from the both end portions of the sleeve when the grout is filled. can do.

  In the mechanical joint of reinforcing steel bars according to the present invention, since the sleeve and the reinforcing steel bars can be firmly connected, it can be widely applied to industries related to reinforced concrete buildings and their components.

It is sectional drawing of the mechanical joint of a reinforcing bar. It is sectional drawing of the mechanical coupling of another rebar. It is sectional drawing of the mechanical coupling of another rebar. It is explanatory drawing which shows the state which mutually overlaps and overlaps two spring members. It is explanatory drawing which shows the restoring force at the time of approaching the axial center of 2 spring members. It is another explanatory drawing which shows the restoring force at the time of approaching the axial center of 2 spring members.

Explanation of symbols

1, 101, 201 Deformed bar 11, 111, 211 Bamboo knot 2, 102, 202 Sleeve 21, 121 Recessed groove 224, 224 (Sleeve) both ends 225 (Sleeve) inner circumference 226 (Sleeve both ends) opening 3, 103, 203 Spring member 131A, 131B (Spring member) shaft 103C Through passage 4, 104, 204 Hole 5, 105, 205 Seal member

Claims (3)

A mechanical joint for connecting the ends of two deformed reinforcing bars,
A cylindrical sleeve and a spiral spring member are provided,
On the inner periphery of the sleeve is formed a spiral groove that can be screwed with the spring member,
In connecting the ends of the two deformed reinforcing bars,
Screwing the spring member into the groove in the sleeve;
Insert so that the ends of the deformed reinforcing bars are attached to the inner periphery of the spring member,
A reinforcing bar mechanical joint, characterized in that grout is filled on the inner peripheral side of the sleeve. In Claim 1, the said spring member is two spring members which consist of the same shape,
In connecting the ends of the two deformed reinforcing bars,
Insert the sleeve in advance into one of the two deformed reinforcing bars,
The above two spring members are overlapped so that the axes intersect each other,
By pressing the outer circumferences of the two spring members so that the axial centers of the two springs coincide with each other, the ends of the deformed reinforcing bars are connected to each other in the through passage formed by overlapping the inner circumferences of the two spring members. And insert it so that
While pressing the outer periphery of the two spring members so that both axial cores coincide with each other, the two spring members are screwed into the groove of the sleeve,
A reinforcing bar mechanical joint, characterized in that grout is filled on the inner peripheral side of the sleeve. In Claim 2, the inner periphery of the sleeve is a circular cross-sectional shape in which the spiral groove is not formed,
The openings at both ends of the sleeve are each formed with a diameter smaller than the inner circumference of the sleeve,
In connecting the ends of the two deformed reinforcing bars,
Insert the sleeve in advance into one of the two deformed reinforcing bars,
The above two spring members are overlapped so that the axes intersect each other,
By pressing the outer circumferences of the two spring members so that the axial centers of the two springs coincide with each other, the ends of the deformed reinforcing bars are connected to each other in the through passage formed by overlapping the inner circumferences of the two spring members. And insert it so that
Inserting the two spring members into the inner circumference of the sleeve while pressing the outer circumferences of the two spring members so that both axes coincide with each other,
A reinforcing bar mechanical joint, characterized in that grout is filled on the inner peripheral side of the sleeve.

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