JP4029342B2 - Mechanical rebar joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical reinforcing bar joint that connects adjacent reinforcing bars with end portions facing each other.
[0002]
[Prior art]
Conventionally, members such as cables, high-tensile tie rods, or PC steel rods have been used as tension materials, but these are both high-strength and expensive, so they are structurally high-strength. When it is used for a foundation structure that does not need to be used, it is conceivable to use an inexpensive reinforcing bar to introduce tension and use it as a tension material.
[0003]
Various methods have been devised for introducing tension to the foundation structure using reinforcing bars. For example, after connecting a plurality of reinforcing bars to a desired length through a joint made of a coupler as shown in Patent Document 1 to form a bonded reinforcing bar, one end of the bonded reinforcing bar is fixed to the footing, and the other end Is also used to tighten the nuts embedded in the footing concrete. In such a method, it is necessary to take a reaction force in some way on the nut side, and when a footing equipped with a sleeve is preliminarily applied to take a reaction force, joining in the sleeve after introducing tension into the joining rebar It requires labor and cost, such as the need to inject grout into the gap between the reinforcing bars. In addition, it is difficult to control the amount of heat shrinkage, although it is inexpensive, by fixing the both ends of the joint rebar described above in concrete such as a footing and then heat shrinking by pressure welding or welding, etc. Therefore, it is difficult to obtain a desired amount of tension introduction.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-309105
Under such circumstances, as a means for ensuring a reaction force function accompanying the introduction of tension without using a complicated mechanism, a plurality of reinforcing bars are connected to a desired length via a turnbuckle instead of a coupler to form a joining reinforcing bar. Then, after fixing both ends of this joining rebar to a footing, the method of introduce | transducing tension using the said turnbuckle is devised.
[0006]
[Problems to be solved by the invention]
However, since the configuration using the turnbuckle for connecting the reinforcing bars as described above is not a component on the premise that the turnbuckle is used as a joint for reinforcing bars, it is generally applied to mechanical rebar joints. It is necessary to use after confirming and evaluating performance whether or not the performance standard is satisfied.
[0007]
In view of the above circumstances, an object of the present invention is to provide a mechanical rebar joint capable of connecting adjacent reinforcing bars with end portions facing each other while having a turnbuckle mechanism.
[0008]
[Means for Solving the Problems]
The mechanical rebar joint according to claim 1 is a mechanical rebar joint for connecting adjacent reinforcing bars facing each other with their end portions facing each other, and a head portion is connected to each of the facing end portions of the adjacent reinforcing bars via fixing means. A pair of screws to be fixed, a coupler that fits the pair of screws to each of both ends, and a nut that is provided in each of the pair of screws and that abuts against the end of the coupler and tightens the coupler. One of the paired screws is a forward screw, and the other is a reverse screw. The inner peripheral surface of the coupler has a forward screw at one end and a reverse screw at the other end. And the nut is disposed at a predetermined distance from the end of the coupler fitted with a part of the screw that makes a pair at both ends. Apply a pressing force in the direction that pulls them together A tension introducing device is provided, and the tension introducing device is a pair of tightening bolts arranged on each of the opposing surfaces of the nuts that make a pair in a state where the screw is passed through the hole provided in the center portion. A jig and a jack provided on a surface opposite to the opposing surface of either of the pair of tightening jigs, and acting to exert a pressing force in a direction to pull the pair of nuts, and the pair of tightening It is provided on both sides of the hole of the jig, and is constituted by a high-tensile tie rod that couples the fastening jig and the jack that form a pair.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The mechanical rebar joint of the present invention is shown in FIGS. According to the present invention, a forward screw and a reverse screw are fixed to opposite ends of adjacent reinforcing bars facing each other, and the forward screw and the reverse screw are fitted to both end portions of a coupler, thereby rebar machine. By rotating the coupler with the same mechanism as the turnbuckle, with both ends fixed, with respect to the jointed reinforcing bar formed by connecting adjacent reinforcing bars with the mechanical reinforcing bar joint. Adjacent reinforcing bars are attracted to the mechanical reinforcing bar joint side, and tension is introduced into the bonded reinforcing bars.
[0012]
As shown in FIG. 1, the mechanical rebar joint 1 includes a forward screw 2, a reverse screw 3, a coupler 4, and a nut 5 that makes a pair.
The forward screw 2 and the reverse screw 3 are screws made of a highly rigid material that is generally used as a building material, and the forward screw 2 and the reverse screw 3 have opposite rotation directions. The coupler 4 is made of the same material as the forward screw 2 and the reverse screw 3, and the inner peripheral surface thereof corresponds to the forward screw 2 on one end side and the reverse screw 3 on the other end side. A threaded surface is formed, and a forward screw 2 is fitted to one end and a reverse screw 3 is fitted to the other end.
[0013]
The pair of nuts 5 are provided on each of the forward screw 2 and the reverse screw 3, and the coupler 4 is fitted in a predetermined length position of the forward screw 2 and the reverse screw 3. The coupler 4 is tightened so that the side surfaces are in contact with both end portions. Thereby, the coupler 4 is securely fixed to the forward screw 2 and the reverse screw 3 at a predetermined position, and even when the length of the forward screw 2 and the reverse screw 3 fitted to the coupler 4 is short, Sufficient rigidity can be ensured in the fitting portion between the forward screw 2 and reverse screw 3 and the coupler 4.
Such a structure in which the forward screw 2 and the reverse screw 3 are fitted to both ends of the coupler 4 is obtained by rotating the coupler 4 in one direction using means such as a torque wrench. Both the screw 2 and the reverse screw 3 can be pulled into the coupler 4.
[0014]
Such a mechanical rebar joint 1 is arranged so that the end portions thereof face each other and are sandwiched between adjacent rebars 6a and 6b in a state where a part of the forward screw 2 and the reverse screw 3 is fitted to the coupler 4. The head of the forward screw 2 is fixed to the end of one reinforcing bar 6a through fixing means such as friction bonding, and the head of the reverse screw 3 is also fixed to the end of the other reinforcing bar 6b. By being fixed through the fixing means, it functions as a joint for connecting one of the reinforcing bars 6a and the other reinforcing bar 6b, and thereby, one bonded reinforcing bar 7 is constituted by the one reinforcing bar 6a and the other reinforcing bar 6b. The
[0015]
A method for introducing the tension of a reinforcing bar using the mechanical reinforcing bar joint 1 will be described below.
First, as a first step, a reversing screw 2 having a nut 5 on one head and a reverse screw having a nut 3 on the other end of the adjacent reinforcing bars 6a and 6b facing each other. After fixing through the fixing means, the forward screw 2 and the reverse screw 3 are fitted to both end portions of the coupler 4 to form the joining rebar 7. Regardless of the method described above, the adjacent reinforcing bars 6a and 6b may be fixed to the forward screw 2 and the reverse screw 3 that are partially fitted to both ends of the coupler 4 with the ends facing each other. .
[0016]
As a second step, after arranging the joining rebar 7 at a predetermined position, as shown in FIG. 2, both ends are embedded and fixed in a concrete foundation 8 such as a footing, and then the forward screw 2 and The coupler 4 is rotated in the direction in which the reverse screw 3 is pulled.
By such a construction procedure, the forward screw 2 and the reverse screw 3 are drawn into the coupler 4, and at the same time, the one reinforcing bar 6a and the other reinforcing bar 6b are respectively directed to the mechanical reinforcing bar joint 1. As a result, the tension is introduced into the entire joining rebar 7 by such an operation.
[0017]
As a third step, after the desired lengths of the forward screw 2 and the reverse screw 3 are drawn into the coupler 4, that is, when a desired amount of tension is introduced into the joining rebar 7, the coupler 4 comes into contact with both ends of the coupler 4. Then, the nuts 5 that make a pair are tightened.
Thereby, the tension | tensile_strength to the said joining reinforcement 7 can be hold | maintained. Further, tightening of the coupler 4 using the nuts 5 that make a pair can also prevent the behavior of the coupler 4 from rotating due to an external force or the like.
[0018]
By the way, the introduction amount in the case of introducing tension to the joint rebar 7 using the mechanical rebar joint 1 takes a sufficiently long member length of the forward screw 2 and the reverse screw 3, and as shown in FIG. It is possible to increase the length of the member of the coupler 4 by increasing the pulling allowance 4c in addition to the necessary fitting length 4a and the construction error absorption allowance 4b on the threaded surface formed on the inner peripheral surface. It is. However, in consideration of the performance related to the threaded surfaces of the forward screw 2 and the reverse screw 3 and the coupler 4, the upper limit is about 3.0 tf. Therefore, when it is desired to introduce a higher tension to the joining rebar 7, a tension introducing device 9 as shown in FIG. 3 may be used.
[0019]
The tension introducing device 9 includes a pair of tightening jigs 10, a pair of high tension tie rods 11, and a jack 12. A pair of tightening jigs 10 has a hole 10a through which the forward screw 2 and the reverse screw 3 penetrate at the center, and one hole is provided for the jointed reinforcing bar 7 provided with the mechanical rebar joint 1. With the forward screw 2 in 10a and the reverse screw 3 in the other hole 10a, the forward screw 2 and the reverse screw 3 partly fitted with the coupler 4 and the paired nut 5 interposed therebetween It is arranged to face each other. The pair of tightening jigs 10 are formed so that the hole 10a has a smaller cross-sectional diameter than the nut 5 and is in contact with the surface facing the opposite surface of the pair of nuts 5. The nut 5 forming the above serves as a stopper, and cannot be moved in the opposite direction.
[0020]
The jack 12 is provided on one side of the pair of tightening jigs 10 and functions together with the pair of high tension tie rods 11 and applies a pressing force in a direction in which the pair of nuts 5 are drawn together. It works. In these, the jack 12 is fixed to a surface opposite to the facing surface of the fastening jig 10, and a pair of high-strength tie rods 11 are arranged on both sides of the joining rebar 7 to form a pair of fastening treatments. It is installed so as to connect the three of the tool 10 and the jack 12.
[0021]
In the tension introducing device 9 having such a configuration, when the jack 12 exerts a pressing force on the opposing surfaces of the tightening jig 10, the pair of tightening jigs 10 are formed via the pair of high tension tie rods 11. Each of them is drawn together with the pair of nuts 5 without moving the relative positions of the forward screw 2 and the reverse screw 3 by the paired nuts 5, and accordingly, one reinforcing bar 6 a and the other reinforcing bar 6 b are also drawn together. As a result, the tension is introduced to the entire joining rebar 7. Therefore, when the tension introducing device 9 is attached to the joining rebar 7, a predetermined amount of clearance L is provided without contacting the paired nut 5 and the coupler 4.
After that, when a desired amount of tension is introduced into the joining rebar 7, the high-strength tie rod 11 is fixed to the jack 12 and the pair of fastening jigs 10, thereby reducing the pressing force of the jack 12. Even if it is opened, a desired amount of tension is maintained in the joint rebar 7.
[0022]
According to the configuration described above, the mechanical rebar joint 1 includes the forward screw 2 and the reverse screw 3, the coupler 4 that fits these at both ends, and the forward screw 2 and the reverse screw 3. 4, each of the heads of the forward screw 2 and the reverse screw 3 is provided with end portions of one rebar 6 a and the other rebar 6 b. By adhering, it is possible to connect one rebar 6a and the other rebar 6b adjacent to each other so that these end portions face each other with a simple configuration.
[0023]
In addition, by fixing both ends of the joining rebar 7 formed via the mechanical rebar joint 1 to the concrete foundation 8, the coupler 4 is rotated in a direction in which the forward screw 2 and the reverse screw 3 are drawn. As the adjacent one of the reinforcing bars 6a and the other reinforcing bar 6b are attracted to each other, it is possible to introduce a tension to the bonded reinforcing bar 7, and it is possible to improve workability without the need for complicated equipment.
[0024]
The mechanical rebar joint 1 includes a forward screw 2 and a reverse screw 3 which are fixed to the heads of the adjacent reinforcing bars 6a and 6b with the end portions facing each other through fixing means. 2 and the reverse screw 3 are connected via a coupler 4, so that the outer peripheral shape of the adjacent reinforcing bars 6a and 6b with the end portions facing each other may be any, high versatility, and workability In addition, it is possible to greatly contribute to the reduction of construction costs.
[0025]
Further, regarding the joint rebar 7 that connects the adjacent rebars 6a and 6b via the mechanical rebar joint 1, when the slack occurs after both ends are fixed or the length of the material needs to be adjusted, the machine Fine adjustment can be performed using the coupler 4 of the type reinforcing bar joint 1, and the workability can be further improved.
[0026]
【The invention's effect】
According to the mechanical rebar joint according to claim 1, the mechanical rebar joint connects adjacent rebars with the end portions facing each other, and the head has a fixing means at each of the facing end portions of the adjacent rebars. A pair of screws fixed to each other, a coupler that fits the pair of screws to each of both ends, and a nut that is provided on each of the pair of screws and that abuts against the end of the coupler and tightens the coupler One of the paired screws is a forward screw, the other is a reverse screw, and the inner peripheral surface of the coupler has a forward screw at one end and an end at the other end. Since the threaded surface corresponding to the reverse screw is formed, it is possible to join the adjacent one reinforcing bar and the other reinforcing bar so that these end portions face each other with a simple configuration.
[0027]
Further, the mechanical rebar joint has a configuration in which the forward screw and the reverse screw are fixed to the head of an adjacent reinforcing bar with an end portion facing each other through fixing means, and the forward screw and the reverse screw are connected via a coupler. For this reason, the outer peripheral shape of the reinforcing bars adjacent to each other with the end portions facing each other may be any, and is highly versatile, which can greatly contribute to the workability and the cost reduction.
[0028]
In addition, for rebars connected via mechanical rebar joints, if slack occurs after both ends are fixed, or if adjustment of the material length is required, fine adjustment using the mechanical rebar joint coupler It is possible to improve the workability.
[0029]
Further, the nut is arranged at a predetermined distance from the end of the coupler fitted with a part of the screw that makes a pair at both ends, and the nut that makes a pair is pushed in a direction that draws them together. There is provided a tension introducing device that acts on the pressure, and the tension introducing device is disposed on each of the opposing surfaces of the opposing nuts in a state where the screw is passed through the hole provided in the central portion. A pair of tightening jigs, and a jack that is provided on a surface opposite to the facing surface of any one of the pair of tightening jigs and that exerts a pressing force in a direction in which the nuts that form the pair are drawn together; It is provided on both sides of the pair of clamping jig holes, and is composed of high tension tie rods that connect the pair of clamping jig and jack, so that a desired amount of tension can be achieved with a simple configuration. Mechanical rebar joint Can be introduced into rebar linked via become.
[Brief description of the drawings]
FIG. 1 is a view showing details of a mechanical reinforcing bar joint according to the present invention.
FIG. 2 is a diagram showing a state of tension introduction to a reinforcing bar using a mechanical reinforcing bar joint according to the present invention.
FIG. 3 is a view showing a tension introducing device provided in a mechanical joint according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mechanical rebar joint 2 Forward screw 3 Reverse screw 4 Coupler 4a Required fitting length 4b Construction error absorption allowance 4c Retraction allowance 5 Nut 6a One rebar 6b The other rebar 7 Joint rebar 8 Concrete foundation 9 Tension introduction device 10 Tightening treatment Tool 11 High tension tie rod 12 Jack

Claims (1)

A mechanical rebar joint that connects adjacent rebars with the ends facing each other,
A pair of screws whose heads are fixed via fixing means to each of the opposite ends of adjacent reinforcing bars;
A coupler for fitting the pair of screws to both ends,
Each of the screws forming a pair is configured by a nut that abuts on the end of the coupler and tightens the coupler.
One of the paired screws is a forward screw and the other is a reverse screw. The inner peripheral surface of the coupler has a forward screw at one end and a screw corresponding to the reverse screw at the other end. A cut surface is formed ,
The nut is arranged with a predetermined separation distance from the end of the coupler fitted with a part of the screw that makes a pair at both ends, and the nut that makes a pair is pressed in a direction that draws them together. Equipped with a working tension introducing device,
The tension introducing device includes a pair of tightening jigs arranged on each of the opposing surfaces of the nuts that make a pair in a state where the screw is passed through the hole provided in the center portion,
A jack that is provided on a surface opposite to a facing surface of any one of the pair of tightening jigs, and that exerts a pressing force in a direction that pulls the pair of nuts;
A mechanical rebar joint comprising a high-strength tie rod that is provided on both sides of the pair of clamping jig holes and connects the pair of clamping jig and jack.

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