JP6013050B2 - Joints used in concrete member reinforcement - Google Patents

Description

  The present invention relates to a joint used in a reinforcing device that enhances earthquake resistance such as a viaduct or a concrete column of a bridge.

  In order to enhance the earthquake resistance of reinforced concrete columns (concrete members) such as existing viaducts and bridges, a reinforcing device disclosed in Patent Document 1 has been developed. Specifically, four screw rebars (tightening members) are arranged along the four sides of the outer periphery of a concrete column having a square cross section, and the ends of these screw rebars are arranged for each corner of the concrete column. Connect to the angle joint using a nut. As a result, a quadrangular annular reinforcing device having four screw rebars and four angle joints is assembled and arranged so as to surround the concrete column over one circumference.

By tightening the nut, a tensile force is applied to the four screw rebars, and the four angle joints hit the side surface near the corner of the concrete column.
A large number of the reinforcing devices are arranged at intervals in the longitudinal direction of the concrete column, thereby reinforcing the concrete column.

In the reinforcing device disclosed in Patent Document 1, each angle joint is formed of a single hardware having a right angle, and two reinforcing bar connecting portions for connecting two adjacent screw reinforcing bars are integrated. . Therefore, it can be applied only to concrete columns whose cross section is square or rectangular and whose corners are perpendicular.
If the reinforcement device of Patent Document 1 is applied to seismic reinforcement of a concrete column whose section is not square or rectangular, an angle joint must be manufactured according to the angle of the corner of the concrete column, and the manufacturing cost is low. It will increase.

  Patent document 2 has proposed the reinforcement apparatus using the coupling which has two metal objects which can be rotated mutually instead of the said angle coupling. This joint can change the angle of the two hardware according to the angle of the corner of the concrete member, so it can be applied to any cross-section concrete member, and the manufacturing cost can be reduced by using a common joint can do.

JP 2000-352111 A Japanese Patent Laid-Open No. 2001-262843

In the joint of the first embodiment shown in FIGS. 1 to 9 of Patent Document 2, the rotation axes of two hardware are positioned at the intersection of the axes of the two screw rebars. Therefore, when the reinforcing device is attached to a concrete column, when the end of the screw rebar is inserted into the two hardware of each joint and tightened with a nut, the rotational moment caused by the pulling force of the two screw rebars The balance was poor, each hardware became unstable, and the workability at the time of mounting was bad. Note that the discussion of this rotational moment will be described in detail in the embodiment of the present invention.
In the joint of 2nd Example of FIGS. 10-12 of patent document 2, each hardware has a contact plate part which contacts the side surface of a concrete pillar, and an upright plate part orthogonal to this contact plate part. It has a letter shape. The ends (the other end on the opposite side of the upright wall) of the two hardware contact plates are pivotably connected to each other, and screw rebars are inserted into the upright plate portions of the respective hardware and connected by nuts. However, since the abutting plate portion has a uniform thickness and a structure for connecting the end portions thereof, the strength of the rotating connecting portion cannot be sufficiently secured, which is not practical.

The present invention has been made to solve the above-described problems, and in order to assemble an annular reinforcing device surrounding a concrete member, a plurality of elongated fastening members along the side surface of the concrete member are provided with corners having chamfers of the concrete member. A joint to be connected at the part,
A first and second hardware are provided, and each of the first and second hardware is provided with a main body having an abutting surface that contacts the side surface of the concrete member, and a circuit provided integrally with one end of the main body. A dynamic connecting part,
The main body has a tightening member connecting portion separated from the rotating connecting portion in the axial direction of the tightening member, and an end of the tightening member is connected to the tightening member connecting portion,
In the joint in which the rotation connecting portions of the first and second hardware are connected to each other so as to be rotatable around a rotation axis extending in a direction orthogonal to the axial direction of the tightening member to be connected,
In each of the first and second hardware, a part of the rotation connecting portion protrudes from the contact surface to the side opposite to the fastening member connecting portion, and the rotation axis is connected. It is shifted from the axis of the tightening member to the contact surface.

According to the above configuration, the angle of the first and second hardware can be changed corresponding to the angle of the corner portion of the concrete member, so that a joint having a common structure can be used for a concrete member having any cross-sectional shape. And the manufacturing cost of the joint can be suppressed.
In addition, since the rotation axis is shifted closer to the contact surface, a large rotation moment is not applied to each hardware when the reinforcing device is mounted on the concrete member, and the mounting work is improved.
In addition, since the rotation connecting portion protrudes from the contact surface, the strength of the rotation connection portion can be sufficiently ensured even if the rotation axis is shifted toward the contact surface. Even if the rotation connecting portion protrudes from the contact surface, the corner portion of the concrete member is chamfered, and therefore does not interfere with the concrete member.

Preferably, the main body portion of each hardware further includes a support portion facing the tightening member connecting portion and the axial direction of the tightening member, and the rotation connecting portion is connected to the support portion and is attached to the contact surface. By projecting in a direction that is inclined with respect to each other, each hardware object is bent.
According to the said structure, the intensity | strength of a rotation connection part can be raised, without increasing the weight of a hardware.

Preferably, at least a part of a shaft portion that rotatably connects the rotation connecting portions of the first and second hardwares protrudes from the contact surface.
According to the above configuration, the rotational moment applied to the hardware can be further reduced while sufficiently securing the diameter of the shaft portion.

When the tightening member is a screw rebar having male threads at least at both ends, preferably, the tightening member connecting portion of each hardware has an insertion hole, and a nut is provided at the end of the screw rebar inserted through the insertion hole. Are screwed together and tightened so that the hardware and the screw rebar are connected, and the main body portion of each hardware further has a pair of side wall portions facing each other in the rotation axis direction, and the pair of side wall portions and An accommodation recess is defined by the connection of the tightening member connecting portion and the support portion, and the nut is accommodated in the accommodation recess. The accommodation recess is closed by the bottom wall portion on the concrete member side and opened on the opposite side. The outer surface of the bottom wall is provided as a part of the contact surface.
According to the said structure, since the accommodation recessed part is open | released on the opposite side of the contact surface, it is easy to operate the tool for tightening a nut.
Further, since the housing recess is surrounded by the pair of side wall portions, the support portion, and the fastening member connecting portion and is closed by the bottom wall portion, the strength of the main body portion is not reduced.
Furthermore, since the outer surface of the bottom wall portion is provided as a part of the abutting surface, the area of the abutting surface can be increased, and the side surfaces near the corners of the concrete member can be stably pressed.

Preferably, the inner surface of the bottom wall portion of the housing recess has a concave curved surface that increases toward the pair of side wall portions.
According to the said structure, the boundary part of the side wall part of a main-body part and a bottom wall part can be thickened, and the intensity | strength of a metal fitting can further be raised.

  According to the present invention, it is possible to perform seismic reinforcement of concrete members having various cross-sectional shapes without increasing the manufacturing cost of the joint, and the work of attaching the reinforcing device to the concrete member without reducing the joint strength. Can be improved.

It is a schematic side view which shows the concrete pillar seismically reinforced by the reinforcement apparatus, This reinforcement apparatus is equipped with the joint concerning 1st Embodiment of this invention. It is AA arrow sectional drawing in FIG. It is an expanded sectional view of the said joint in the B section in FIG. It is a top view which shows the said joint in the state opened 180 degrees. It is a side view which decomposes | disassembles and shows the 1st, 2nd metal fitting of the said coupling. FIG. 4 is a view corresponding to FIG. 3 for explaining a moment acting on the first hardware, and is shown without hatching. FIG. 4 is a view corresponding to FIG. 3 for explaining a moment acting on the second hardware, and is shown without hatching. It is an expanded sectional view which shows the nut fastening process in the said coupling. FIG. 3 is a view corresponding to FIG. 2 when the reinforcing device is mounted on a concrete pillar whose cross-sectional shape is not square. FIG. 10 is an enlarged sectional view of a portion C in FIG. 9. FIG. 10 is an enlarged cross-sectional view of a portion D in FIG. 9. FIG. 3 is a view corresponding to FIG. 2 showing a modification of the reinforcing device. FIG. 5 is a view corresponding to FIG. 4 illustrating a joint according to a second embodiment of the present invention. It is a principal part enlarged plan view which shows the metal fitting of the joint concerning 3rd Embodiment of this invention. FIG. 9 is a view corresponding to FIG. 3 and illustrating a joint according to a fourth embodiment of the present invention, omitting hatching of nuts and connecting pins. It is the figure which looked at the convex part of the 1st metal fitting of the joint of the 4th embodiment from the direction of an axis of a screw rebar.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, an existing reinforced concrete column 1 (concrete member) such as a viaduct or a bridge is mounted with a number of reinforcing devices 2 spaced in the longitudinal direction (vertical direction).

  As shown in FIG. 2, the concrete pillar 1 has a quadrangular cross section, and has four flat side surfaces 1a and four corners 1b located at the intersections of the side surfaces 1a. A chamfer 1c that is inclined with respect to two adjacent side surfaces 1a is formed in the corner portion 1b. Each reinforcing device 2 has a quadrangular ring shape corresponding to the cross-sectional shape of the concrete column 1 and surrounds the concrete column 1 over one circumference.

  The reinforcing device 2 includes four linear screw rebars 3 (tightening members) and four joints 4. The screw rebar 3 is arranged substantially horizontally (in a direction perpendicular to the longitudinal direction of the concrete column 1) along the four flat side surfaces 1a of the concrete column 1. The joint 4 is arrange | positioned for every corner | angular part 1b of the concrete pillar 1, and connects the edge part of two adjacent screw reinforcing bars 3. FIG.

  As best shown in FIGS. 3 to 5, each joint 4 is constituted by connecting a first hardware 10 and a second hardware 20 each made of a casting or the like so as to be rotatable. This rotation axis is indicated by the symbol L.

  The first hardware 10 includes a flat main body portion 11 having a flat rectangular shape and a rotation connecting portion 12 that is continuous with one end side of the main body portion 11. Similarly, the second hardware 20 also has a flat main body portion 21 having a flat rectangular shape and a rotation connecting portion 22 that is integrally connected to one end side of the main body portion 21.

  Only one pivotal connecting portion 12 of the first hardware 10 protrudes from the end of the main body 11 at the center in the width direction, and the pivotal connecting portion 22 of the second hardware 20 is the end of the main body 21. In FIG. 1, a pair is formed in the width direction. Then, the rotation connecting portion 12 is inserted between the pair of rotation connecting portions 22, and the connecting pins 30 (shaft portions) are inserted into the shaft holes 12a and 22a (bearing portions) formed in the rotation connecting portions 12 and 22, respectively. By making it penetrate, the metal objects 10 and 20 are connected so that rotation is possible. In this embodiment, the connecting pin 30 is formed by a bolt, and a nut 31 is screwed to the tip of the bolt.

  The main body portion 11 of the first hardware 10 has a flat contact surface 11a, and integrally includes a support portion 11b, a reinforcing bar connecting portion 11c (tightening member connecting portion), and a pair of side wall portions 11d. Yes. The abutting surface 11 a comes into contact with the side surface 1 a of the concrete column 1.

  As will be described later, the support portion 11b and the reinforcing bar connecting portion 11c are opposed to each other in the axial line 3x direction (direction orthogonal to the rotational axis L) of the screw reinforcing bar 3 to be connected. The reinforcing bar connecting portion 11c has a hole 11y whose central axis is orthogonal to the rotation axis L, and the screw reinforcing bar 3 is inserted into the hole 11y. Note that the surface of the reinforcing bar connecting portion 11c that faces the support portion 11b is a flat surface that is orthogonal to the central axis of the hole 11y.

The pair of side wall portions 11d face each other in the direction of the rotation axis L and connect the support portion 11b and the reinforcing bar connecting portion 11c.
An accommodation recess 11z is formed so as to be surrounded by the support portion 11b, the reinforcing bar connecting portion 11c, and the pair of side wall portions 11d. The housing recess 11z has a flat rectangular shape, and one side (concrete column 1 side) is closed by the bottom wall 11e, and the other side is open. The outer surface of the bottom wall 11e is provided as a part of the contact surface 11a.

  As shown in FIG. 8, the inner surface of the bottom wall 11e, that is, the bottom surface of the housing recess 11z has an arcuate surface (concave curved surface that becomes higher toward the pair of side wall portions 11d) whose central axis is orthogonal to the rotation axis L. There is no.

  The main body portion 21 of the second hardware 20 has the same shape as the main body portion 11 of the first hardware 10, and includes a contact surface 21a, a support portion 21b, a reinforcing bar connecting portion 21c having a hole 21y, and a pair of side wall portions 21d. And a bottom wall 21e and a housing recess 21z.

In the first hardware 10, the rotation connecting portion 12 is connected to the support portion 11 b. The rotation connecting portion 12 forms an obtuse angle with the main body 11 and protrudes in an inclined direction with respect to the abutting surface 11a, whereby the first hardware 10 has a bent shape. A part of the rotation connecting part 12 protrudes from the abutting surface 11a in the direction opposite to the support part 11b and the reinforcing bar connecting part 11c. This protrusion amount is indicated by a symbol T in FIG. Along with this, the axis of the shaft hole 12a through which the connecting pin 30 in the rotating connecting portion 12 passes is deviated from the axis of the hole 11y of the reinforcing bar connecting portion 11c, and is shifted closer to the contact surface 11a.
Similarly to the first hardware 10, the second hardware 20 has a bent shape, a part of the rotation connecting portion 22 protrudes from the contact surface 21a, and the shaft hole 22a of the rotation connecting portion 22 extends from the axis of the hole 21y. It is shifted toward the disengagement contact surface 21a.
As a result, when the hardware 10 and 20 are connected by the connecting pin 30 and the two screw rebars 3 are connected to the hardware 10 and 20, respectively, the rotation axis L is the intersection of the axis 3x of the two screw rebars 3. It will shift more inward.

  In the present embodiment, in the first hardware 10, the extension surface of the contact surface 11 a crosses the shaft hole 12 a of the rotation connecting portion 12. The same applies to the second hardware 20. As a result, a part of the connecting pin 30 supported by the shaft holes 12a and 22a protrudes from the contact surface 11a.

The operation of the reinforcing device 2 configured as described above will be described. First, a case where the concrete pillar 1 having a square cross section as shown in FIG. 2 is used for seismic reinforcement will be described.
At the lower end of the concrete column 1, the reinforcing device 2 is assembled. That is, four screw rebars 3 are arranged along the side surface of the concrete column 1, and four joints 4 are arranged at the corners of the concrete column 1.

  Each joint 4 is bent so that the first and second hardware 10 and 20 form a right angle, and the ends of the adjacent threaded reinforcing bars 3 are connected to the first and second hardware 10 and 20, respectively. Specifically, the end of the screw rebar 3 is inserted into the holes 11y and 21y of the reinforcing bar connecting portions 11c and 21c of the hardware 10 and 20, and is protruded into the housing recesses 11z and 21z. Further, a tightening nut 41 and a lock nut 42 are screwed into the end portions of the screw reinforcing bars 3 in the housing recesses 11z and 21z.

  As described above, the reinforcing device 2 is assembled in a substantially square ring so as to surround the concrete column 1 over one circumference, but the circumference is larger than the outer circumference of the concrete column 1 and surrounds the concrete column 1 loosely. Yes.

  Next, the reinforcing device 2 is moved upward along the concrete pillar 1 to the mounting position, and at this mounting position, the tightening nuts 41 in the four joints 4 are tightened to give a tensile force to the screw rebar 3, The contact surfaces 11a and 21a of the first hardware 10 and the second hardware 20 are brought into close contact with the side surface of the concrete column 1 with a strong force. Further, the lock nut 42 is tightened to prevent the tightening nut 41 from loosening. Note that the tightening nut 41 may be fixed to the screw rebar 3 with an adhesive instead of using the lock nut 42.

As shown in FIG. 8, the receiving recesses 11z and 21z are open on the opposite side of the contact surfaces 11a and 21a , so that the spanner 50 (tool) can be easily operated when the nuts 41 and 42 are tightened. . Further, since the bottom surfaces of the housing recesses 11z and 21z are arcuate surfaces, the spanner 50 can be rotated even though the boundary between the contact surfaces 11a and 21a and the pair of side walls 11d and 21d can be thickened. Does not interfere with operation.

  During the mounting operation of the reinforcing device 2, when the nut 41 is tightened, the metal parts 10 and 20 of each joint 4 are subjected to a turning moment due to the pulling force from the two threaded reinforcing bars 3. Hereinafter, the turning moment applied to the first hardware 10 will be described with reference to FIG.

With the intersection A between the side surface 1a of the concrete column 1 and the chamfer 1c as a fulcrum, the first hardware 10 has a clockwise rotational moment M2 due to the pulling force F2 from the screw rebar 3 connected to the second hardware 20. Is granted. Since this rotation moment M2 acts on the first hardware 10 with the connecting pin 30 as an action point, it can be expressed by the following equation.
M2 = H2 × F2 (1)
However, H2 is the distance between the fulcrum A and the rotation axis L in the direction orthogonal to the force F2.

On the other hand, the first hardware 10 is given a counterclockwise turning moment M1 due to the pulling force F1 from the screw rebar 3 connected to the first hardware 10. This rotational moment M1 can be expressed by the following equation.
M1 = H1 × F1 (2)
However, H1 is the distance between the fulcrum A and the axis 3x of the screw rebar 3 in the direction orthogonal to the force F1.

  The first hardware 10 becomes unstable as the rotational moment M2 is larger than the rotational moment M1 and the difference is large. In the present embodiment, since the rotation axis L is shifted from the axis 3x of the screw rebar 3 connected to the second hardware 20 toward the contact surface 21a, the distance H2 can be reduced. The difference between the rotation moments M1 and M2, that is, the rotation moment in the clockwise direction applied to the first hardware 10 can be reduced and can be stably held.

For comparison, a case where the rotation axis L is positioned on the axis 3x of the screw rebar 3 will be described. In this case, the clockwise turning moment M2 becomes large as represented by the following formula, and the first hardware 10 becomes unstable.
M2 = Ha × F2 (3)
However, Ha is the distance between the fulcrum A and the axis 3x of the screw rebar 3 in the direction orthogonal to the force F2.

Next, the rotational moment applied to the second hardware 10 will be described with reference to FIG.
With the intersection B between the side surface 1a of the concrete column 1 and the chamfer 1c as a fulcrum, the second hardware 20 has a counterclockwise turning moment caused by the pulling force F1 from the screw rebar 3 connected to the first hardware 10. M1 ′ is given. Since this rotation moment M1 ′ acts on the second hardware 10 with the connecting pin 30 as an action point, it can be expressed by the following equation.
M1 ′ = H1 ′ × F1 (4)
However, H1 'is the distance between the fulcrum B and the rotation axis L in the direction orthogonal to the force F1.

On the other hand, the second metal fitting 10 is also given a clockwise turning moment M2 ′ caused by the pulling force F2 from the screw rebar 3 connected to the second metal fitting 10. This rotational moment M2 ′ can be expressed by the following equation.
M2 ′ = H2 ′ × F2 (5)
However, H2 ′ is the distance between the fulcrum B and the axis 3x of the screw rebar 3 in the direction orthogonal to the force F2.

  The second hardware 10 becomes more unstable as the rotational moment M1 'is larger than the rotational moment M2' and the difference is larger. In the present embodiment, since the rotation axis L is shifted closer to the contact surface 11x than the axis 3x of the screw rebar 3, the distance H1 ′ can be reduced, so that the rotation moments M1 ′ and M2 ′. Difference, that is, the counterclockwise turning moment can be reduced. Therefore, the second hardware 20 can be maintained stably.

For comparison, a case where the rotation axis L is positioned on the axis 3x of the screw rebar 3 will be described. In this case, the counterclockwise turning moment M1 ′ becomes large as represented by the following formula, and the second hardware 10 becomes unstable.
M1 ′ = Hb × F1 (6)
However, Hb is the distance between the fulcrum B and the axis 3x of the screw rebar 3 in the direction orthogonal to the force F1.

As described above, the rotational moment applied to the hardware 10 and 20 can be reduced and the holding thereof is easy, so that the mounting operation of the reinforcing device 2 can be performed smoothly.
Since the rotation connecting portions 12 and 22 protrude from the contact surfaces 11a and 21a, the shaft holes 12a and 22a surrounding the connection pin 30 even if the rotation axis L is shifted toward the contact surfaces 11a and 21a. The wall thickness of the peripheral wall can be sufficiently secured, and the necessary strength can be secured.
Even if the rotation connecting portions 12 and 22 protrude from the contact surfaces 11a and 21a, the corner 1b of the concrete column 1 is formed with the chamfer 1c. There will be no interference.

  Further, since the hardware 10 and 20 has a bent shape and the rotation connecting portions 12 and 22 are inclined to protrude from the contact surfaces 11a and 21a, extra material can be omitted, and the hardware 10 and 20 is lightweight. Can be

  Furthermore, in this embodiment, since a part of the connecting pin 30 also protrudes from the contact surfaces 11a and 21a of the hardware 10 and 20, the rotation axis L is set to the screw rebar 3 while ensuring a sufficient diameter of the connecting pin 30. Further deviation from the axis 3a can be achieved.

As described above, the reinforcing devices 2 are attached in order from the top, and the seismic reinforcement structure as shown in FIG. 1 is completed.
In this embodiment, the metal objects 10 and 20 are in surface contact with the side surface 1a in the vicinity of the corner 1b of the concrete column 1 by the large contact surfaces 11a and 21a including the bottom wall portions 11e and 21e of the main body portions 11 and 21. Since it presses in a state, the swelling of the cross-sectional area of the concrete pillar 1 at the time of an earthquake can be suppressed reliably, and the destruction can be prevented.

The reinforcing device 2 of the present invention can be used not only for reinforcing a square concrete column 1 in which four corners form a right angle but also for reinforcing a non-square concrete column. Hereinafter, an example will be described.
In the concrete column 1 ′ shown in FIG. 9, the upper left corner 1b and the lower left corner 1b form a right angle, but the upper right corner 1b forms an acute angle, and the lower right corner 1b forms an obtuse angle. Yes.

  In the corner portion 1b forming the acute angle of the concrete column 1 ′, as shown in FIG. 10, the angle between the first hardware 10 and the second hardware 20 of the joint 4 can be made acute corresponding to the corner 1b. The contact surfaces 11a and 21a can be brought into surface contact with the side surface 1a of the concrete pillar 1, and the screw rebar 3 can be arranged along the side surface 1a of the concrete 1 '.

  In the corner portion 1b forming the obtuse angle of the concrete column 1 ′, as shown in FIG. 11, the angles of the first hardware 10 and the second hardware 20 of the joint 4 can be made obtuse corresponding to the corner portion 1b. The contact surfaces 11a and 21a can be brought into surface contact with the side surface 1a of the concrete pillar 1, and the screw rebar 3 can be arranged along the side surface 1a of the concrete 1 '.

  Even when the reinforcing device is attached to the concrete pillar 1 ′ in FIG. 9, it is a matter of course that the hardware 10 and 20 of each joint 4 can be stably held as described above.

  The concrete column 1 ′ in FIG. 9 has two angles at right angles, but it can be easily understood that the joint 4 can also be applied to seismic reinforcement of concrete columns at which all angles are not right angles.

  In the case of the concrete column 1 ′ having a cross-sectional shape in FIG. 9, the threaded reinforcing bars 3 may be connected to each other at a right-angled corner by using a right-angle angle joint having two main bodies integrally as in Patent Document 1. .

  As described above, the joint 4 having the same structure can be used regardless of the angle of the corner portion of the concrete column 1, so that the manufacturing cost of the joint 4 can be suppressed, and the cost of the reinforcing device 2 can be suppressed. be able to.

FIG. 12 shows another reinforcing device 2 ″ used for reinforcing a concrete column 1 ″ having a square cross section. In this reinforcing device 2 ″, two screw rebars 3A and 3B bent in a substantially L shape are used.
The ends of the screw rebars 3A and 3B are connected at the two corners of the concrete column 1 ″ by the same joint 4 as in the first embodiment. The other two corners have the same angle as these corners. The bent portions of the formed screw rebars 3A and 3B are supported by angle metal pieces 6A and 6B having the same angle as the corner portions, and the angle metal pieces 6A and 6B have grooves for accommodating the bent portions of the screw rebars 3A and 3B. And has a U-shaped cross section.

  FIG. 13 shows the joint 104 of the second embodiment. In the joint 104, the first hardware 110 and the second hardware 120 have the same shape. Since the main body portions 111 and 121 of the hardware 110 and 120 have the same structure as the main body portions 11 and 21 of the hardware 10 and 20 described above, description thereof will be omitted.

The first hardware 110 has a pair of rotational connection portions 112 that are shifted in the direction of the rotational axis L, and the second hardware 120 also has a similar pair of rotational connection portions 122. The metal fittings 110 and 120 are rotatably connected by allowing the connecting pin 30 to pass through in a state where the rotation connecting portions 112 and 122 are engaged with each other.
Since the first and second hardware 110 and 120 have the same shape, the joint 104 can further reduce the manufacturing cost.
The relationship between the rotation connecting portions 112 and 122 and the contact surfaces of the main body portions 111 and 121 is the same as in the first embodiment.

  Further, as in the third embodiment shown in FIG. 14, the hole 150 may be formed in the hardware 110 (and / or 120). Concrete nails and screws are driven into the concrete columns from these holes 150 to fix the reinforcing device to the concrete columns.

  15 and 16 show a joint 4A of the fourth embodiment. This joint 4A is the same as the joint 4 of the first embodiment except that convex portions 15 and 25 are formed on the reinforcing bar connecting portions 11c and 21c of the hardware 10 and 20, respectively. The protrusions 15 and 25 protrude toward the housing recesses 11z and 21z as shown in FIG. 15, have an inverted U shape, for example, as shown in FIG. 16, and have a flat receiving surface orthogonal to the axis of the reinforcing bar 3. doing. The upper surface of the nut 41 (the portion far from the side surface of the concrete pillar 1) is in contact with this receiving surface. The lower portion of the nut 41 (the portion closer to the side surface of the concrete column 1) does not hit the contact surface of the convex portions 15 and 25.

According to the said structure, the metal fittings 10 and 20 of the coupling 4 can be hold | maintained more stably at the time of the clamp | tightening with the nut 41 in the coupling 4. FIG. The reason will be described taking the first hardware 10 as an example.
The turning moment M2 in the clockwise direction due to the pulling force F2 from the screw rebar 3 connected to the second hardware 20 is expressed by the above formula (1) as in the first embodiment.

On the other hand, the counterclockwise turning moment M1 caused by the pulling force F1 from the screw rebar 3 connected to the first hardware 10 can be expressed by the following equation.
M1 = Hx × F1 (7)
However, Hx is the distance between the fulcrum A in the direction orthogonal to the force F1 and the point of action of the tensile force F1. This point of action is shifted in the direction away from the side surface of the concrete 1 from the axis 3x of the reinforcing bar 3 because the upper portion of the nut 41 hits the receiving surface of the convex portion 15. Therefore, the distance Hx is the above-described equation (2). Distance H1 (distance between the fulcrum A and the axis 3a of the screw rebar 3). As a result, the counterclockwise rotation moment M1 obtained by the above equation (7) is larger than the rotation moment M1 obtained by the equation (1), and therefore the difference between the rotation moments M1 and M2 is further reduced. The first hardware 10 can be held more stably.

The discussion about the first hardware 10 also applies to the rotational moment at the fulcrum B that acts on the second hardware 20.
Instead of the convex portions 15 and 25 in FIG. 15, the receiving surface that the nut 41 hits in the reinforcing bar connecting portion 11 c may be a gently inclined surface. This inclined surface inclines so that it may approach the support part 11 as it leaves | separates from the contact surface 11a.

The present invention is not limited to the above embodiment, and various forms can be adopted. For example, a screw rebar may be used as a connecting pin for hinge-connecting the first and second hardware. In this case, the nuts are screwed into the protruding portions at both ends of the threaded reinforcing bars that pass through the rotating connection portions of the first and second hardware.
Further, the connecting pin may have a round bar shape. In this case, a small-diameter lock pin orthogonal to the connecting pin is passed through the protruding portions at both ends of the connecting pin that passes through the rotating connecting portion to prevent the connecting pin from falling off. When a round bar-shaped connecting pin having a head portion at one end is used, the lock pin is penetrated only at the other end portion.
In addition, when using a round bar-shaped connecting pin having a head at one end, the connecting pin is removed by using a C-ring that fits into the annular groove on the outer periphery of the other end of the connecting pin and the annular groove on the inner periphery of the metal shaft hole. It may be prevented.

  A common long bar disposed along a corner of the concrete member may be used as a connecting pin of a number of reinforcing devices disposed at intervals in the longitudinal direction of the concrete member. For example, a round bar or a screw rebar can be used as the long member. When using round bars, the first and second hardwares are moved along the long bars by passing lock pins through the round bars on the upper and lower sides or the lower side of the first and second hardwares of each set. Stop moving. In addition, when using a threaded rod, the first and second hardware are aligned with the long bar by screwing a nut onto the threaded rod on the upper and lower sides or the lower side of each pair of the first and second hardware. To stop moving. In addition, the lock pin and nut provided in a long member can also be omitted. In this case, by tightening the screw rebar with a nut, the first and second hardware hit the concrete member and the vertical movement thereof is prevented.

  Alternatively, the first and second hardware may be hinged by omitting the connecting pins that pivotably connect, and instead fitting the concaves and convexes formed on the pivotal connecting portions of these hardware. That is, the shaft (projection) is formed integrally with the rotation connecting portion of one hardware, and the bearing (concave) is formed on the other.

As is well known, screw rebars include not only those in which screw nodes are formed on the outer periphery by rolling, but also those in which machine screws are formed at both ends.
Reinforcing bars other than threaded reinforcing bars may be used as the tightening member. In this case, fixing means such as welding is used instead of the nut.
In the reinforcing device, the joint of the present invention may be arranged at at least one corner of a concrete column having a square cross section.
The concrete pillar may be a polygon other than a rectangular cross section.
The concrete member to be reinforced is not limited to a vertically extending member such as a pillar, but may be a horizontally extending member.

  The present invention can be used for seismic reinforcement of reinforced concrete columns of viaducts and bridges.

1, 1 ', 1 "concrete pillar (concrete member)
2,2 "reinforcement device 3, 3A, 3B Screw rebar (tightening member)
3x Axis 4, 4A, 104 Joint 10, 110 First hardware 20, 120 Second hardware 11, 21, 111, 121 Main body 12, 22, 112, 122 Rotating coupling 11a, 21a Contact surface 11b, 21b Support Part 11c, 21c Rebar connecting part (tightening member connecting part)
11d, 21d Side wall part 11e, 21e Bottom wall part 11z, 21z Housing recessed part 30 Connection pin (shaft part)
41, 42 Nut L Rotation axis

Claims (5)

A joint for connecting a plurality of elongated fastening members along side surfaces of a concrete member at corners having chamfers of the concrete member to assemble an annular reinforcing device surrounding the concrete member,
A first and second hardware are provided, and each of the first and second hardware is provided with a main body having an abutting surface that contacts the side surface of the concrete member, and a circuit provided integrally with one end of the main body. A dynamic connecting part,
The main body has a tightening member connecting portion separated from the rotating connecting portion in the axial direction of the tightening member, and an end of the tightening member is connected to the tightening member connecting portion,
In the joint in which the rotation connecting portions of the first and second hardware are connected to each other so as to be rotatable around a rotation axis extending in a direction orthogonal to the axial direction of the tightening member to be connected,
In each of the first and second hardware, a part of the rotation connecting portion protrudes from the contact surface to the side opposite to the fastening member connecting portion, and the rotation axis is connected. A joint that is shifted from the axis of the tightening member toward the contact surface.   The main body portion of each hardware further has a support portion facing the tightening member connecting portion and the axial direction of the tightening member, and the rotation connecting portion is connected to the support portion and inclined with respect to the contact surface. The joint according to claim 1, wherein each metal piece is bent in a protruding shape.   3. The joint according to claim 1, wherein at least a part of a shaft portion that rotatably connects the rotation connecting portions of the first and second hardwares protrudes from the contact surface. 4. . The joint according to any one of claims 1 to 3, which is used when the tightening member is a screw rebar having male threads at least at both ends, wherein the tightening member connecting portion of each hardware has an insertion hole, A nut is screwed onto the end of the screw rebar inserted through the insertion hole and tightened, thereby connecting the hardware and the screw rebar,
The main body portion of each hardware further has a pair of side wall portions facing each other in the rotation axis direction, and an accommodation recess is defined by the pair of side wall portions, the tightening member connecting portion, and the support portion being connected. The nut is accommodated in the accommodation recess, the concrete recess side is closed by the bottom wall portion, and the opposite side is opened, and the outer surface of the bottom wall is provided as a part of the contact surface. A joint characterized by that.   The joint according to claim 4, wherein the inner surface of the bottom wall portion of the housing recess has a concave curved surface that increases toward the pair of side wall portions.

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