JP2016003439A - Method for fixing metal fixture on reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable confirmation of an insertion length of a screw reinforcement into a metal fixture, when the metal fixture is fixed on the screw reinforcement.SOLUTION: A metal fixture 10 includes a tube part 11 into which an end of a screw reinforcement 20 is screwed, a base 12 that closes an end of the tube part 11 and has a hole 13a that leads to an inner space of the tube part 11, and a flange part 14 protruding outward in a radial direction from an outer periphery of the tube part, and is screwed onto the screw reinforcement 20 for fixing. The tube part 11 is screwed onto the screw reinforcement 20 while inserting a pin 15 into the hole 13a in a way that allows movement in an axial direction of the hole 13a, the pin 15 having a length greater than the thickness of the base 12. An end of the screwed screw reinforcement 20 pushes the pin 15 inside the tube part 11, causing the pin 15 to protrude from the base 12 and allowing visual confirmation of the insertion length of the screw reinforcement 20.

Description

  The present invention relates to a method for fixing a fixing hardware to a reinforcing bar, in which the insertion length of the reinforcing bar into the fixing hardware can be confirmed.

  For example, in the beam of a reinforced concrete building, the end of the main bar extending in the horizontal direction is located at the intersection with the column. In order to fix the ends of the main bars to the concrete at the intersections, various devices have been conventionally made. One example is disclosed in Patent Document 1.

  In Patent Document 1, as shown in FIG. 7, a screw reinforcing bar 20 is used as a main reinforcing bar, and a fixing hardware 100 is attached to an end portion of the screw reinforcing bar 20. As shown in FIG. 7, the fixing hardware 100 has a cylindrical portion 101 to which an end portion of the screw rebar 20 is screwed, and a hole 102 a that closes one end of the cylindrical portion 101 and continues to the internal space of the cylindrical portion 101. A base 102 and a flange 103 projecting radially and outwardly from the outer periphery of the cylindrical portion 101 are provided. The fixing hardware 100 is screwed and fixed to the screw rebar 20. A female screw portion 101 a is formed on the inner periphery of the tube portion 101, and is screwed into the end portion of the screw rebar 20. The fixing metal 100 is screwed into the screw reinforcing bar 20 until the end of the screw reinforcing bar 20 reaches the end of the fixing metal 100. After that, grout is injected from the hole 102 a and the grout is filled in the gap between the fixing hardware 100 and the screw rebar 20. In this manner, concrete is placed with the fixing hardware 10 attached to the screw rebar 20. The flange portion 103 of the fixing hardware 100 embedded in the concrete serves as a resistance against the axial force of the screw rebar 20 and helps fix the screw rebar 20.

  In order to increase the fixing strength of the screw rebar 20 to the concrete, the fixing metal 100 is sufficiently screwed into the screw rebar 20 so that the fixing metal 100 is not pulled out of the screw rebar 20 to ensure the necessary screwing strength. Need to be.

  When the screw rebar 20 is inserted into the fixing hardware 100 having the above-described configuration with one end closed, the inside of the cylinder portion 101 cannot be seen, and the insertion length of the screw rebar 20 cannot be confirmed from the appearance. Therefore, when confirming the insertion length of the screw rebar 20, the inside of the cylindrical portion 11 was looked into from the hole 102 a of the base 102. Alternatively, considerations such as displaying a necessary screwing length on the screw rebar 20 in advance are required. For example, a marking extending in the longitudinal direction is applied to the outer periphery at a position away from the end of the screw rebar 20 by painting or the like.

Japanese Patent No. 2662150

  As described above, conventionally, in order to confirm the insertion length of the screw rebar 20, the inside of the cylindrical portion 11 is looked into from the hole 102 a of the base 102, or the screw rebar 20 is marked in advance. However, the inside of the cylinder portion 11 is dark, and it takes time to confirm the insertion length of the threaded reinforcing bar 20, and the work of pre-marking must be applied or sprayed accurately on a predetermined place using a jig or the like. It needed a lot of manpower and was very cumbersome.

  The present invention solves the above-described problem, and includes a cylindrical portion in which an end portion of a reinforcing bar is screwed, a base that closes one end of the cylindrical portion and that is continuous with an internal space of the cylindrical portion, and the cylindrical portion A fixing metal fitting having a flange projecting radially and outwardly from the outer periphery of the screw is fixed to the reinforcing bar by screwing, and a pin having a length longer than the thickness of the base is prepared. With the pin inserted into the hole so as to be movable in the axial direction of the hole, the cylindrical part is screwed into the reinforcing bar, and the end of the screwed reinforcing bar pushes the pin within the cylindrical part. The pin is protruded from the base, and the insertion length of the reinforcing bar can be visually confirmed.

  According to the above method, when the fixing hardware is screwed and fixed to the reinforcing bar, the insertion length of the reinforcing bar can be confirmed with the pin protruding from the hole of the base, so that the screwing strength between the fixing hardware and the reinforcing bar can be determined. It can be obtained at a level that does not pull out.

  Preferably, the pin has a cylindrical shape with both ends opened, and after the screwing is completed, the pin is inserted into the hole of the base, and grout is injected from one end of the pin, Fill the gap between the reinforcing bars with grout.

  According to the above method, the pin used for confirming the insertion length of the reinforcing bar can be used as a grout inlet. Grout injection is possible while checking the insertion length of the reinforcing bars.

Preferably, after the screwing is completed, the pin protruding from the base is pulled out, grout is injected from the hole, and the gap between the fixing metal and the reinforcing bar is filled with grout.
According to the above method, the hole of the base can be used as a grout inlet.

Another aspect of the present invention is a reinforcing bar insertion length confirmation pin, in the pin used in the above method, a notch through which a grout is passed is formed in the peripheral wall at the other end.
According to the pin, the notch becomes a grout flow path, and the grout is surely filled in the gap between the fixing metal and the reinforcing bar.

Another aspect of the present invention is a reinforcing bar insertion length confirmation pin, wherein the pin used in the above method has a retaining protrusion projecting radially outward from the outer periphery, and the projecting section. Is larger than the diameter of the hole.
According to the pin, the protrusion can prevent the pin from falling out of the hole.

  According to the present invention, since the insertion length of the screw rebar to the fixing metal can be confirmed in fixing the fixing metal to the screw rebar, it is possible to obtain a screwing strength at a level at which the fixing metal does not pull out from the screw rebar. it can. As a result, the fixing strength of the screw reinforcement in the concrete can be increased.

It is sectional drawing which shows 1st Embodiment of this invention, and shows the state which the insertion length of the screw reinforcement was insufficient. It is the same sectional drawing and shows the state where the insertion length of the screw reinforcement was satisfied. It is a longitudinal cross-sectional view of the pin used for 2nd Embodiment, and shows the state inserted in the hole of the fixing metal object. It is sectional drawing which shows the same embodiment, and shows the state which the insertion length of the screw reinforcement was satisfied. It is a longitudinal cross-sectional view of the pin used for 3rd Embodiment, and shows the state inserted in the hole of the fixing metal, (A) is a pin with a protrusion formed on one end, and (B) is A pin having a protrusion formed at one end and a press portion formed at the other end is shown. It is a longitudinal cross-sectional view of the pin used for the modification of 3rd Embodiment, and shows the state inserted in the hole of the fixing metal object. It is sectional drawing shown in the state with which the conventional fixing metal fitting was mounted | worn with the edge part of the screw reinforcement.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 and 2 show an example of a method for fixing a fixing hardware according to the present invention to a reinforcing bar. As shown in FIG. 1, in this method, a screw rebar 20, a fixing hardware 10 and a pin 15 are prepared.

  A male screw portion 21 is formed on the outer periphery of the screw rebar 20. Further, on the outer periphery of the screw rebar 20, male screw portions 21 may be formed at two locations facing each other in the radial direction, and a pair of flat surface portions may be formed so as to be sandwiched between the male screw portions 21.

  The fixing metal 10 is made of a casting, and includes a cylindrical portion 11 and a base 12 provided at one end of the cylindrical portion 11 as in the conventional fixing metal 100 shown in FIG.

  The outer periphery of the cylindrical portion 11 has a hexagonal shape so that a jig such as a spanner can be hung. A female screw portion 11 a is formed on the inner periphery of the cylindrical portion 11. The base 12 has a disk shape and is provided concentrically with the cylindrical portion 11. In the base 12, a portion extending in the radial direction and the inward direction from the cylindrical portion 11 is provided as the closing portion 13, and a portion extending from the cylindrical portion 11 in the radial direction and the outward direction is provided as the flange portion 14. A hole 13 a is formed at the center of the blocking portion 13.

A recessed portion 31 is formed in the closed portion 13 on the inner space side of the cylindrical portion 11. The diameter of the recess 31 is smaller than the valley diameter of the male thread portion 21 of the screw rebar 20. Even when the end surface of the screw rebar 20 abuts against the closed portion 13, a gap 30 is formed between the end surface of the screw rebar 20 and the closed portion 13. Since the gap 30 serves as a grout flow path as will be described later, it is preferable that the clearance 30 be equal to or greater than the clearance between the male threaded portion 21 of the screw rebar 20 and the female threaded portion 11a of the cylindrical portion 11.
The fixing hardware 10 having the above configuration is attached to the end of the screw rebar 20.

The pin 15 has a cylindrical shape, and the shape and size of the outer periphery of the pin 15 corresponds to the shape and size of the inner periphery of the hole 13a, and the pin 15 is movable in the axial direction within the hole 13a. . The axial length D ₀ of the pin 15 is longer than the thickness D ₁ of the closing portion 13. In the inner space of the cylindrical portion 11, from the end surface of the closure portion 13, the distance to the position where the withdrawn screwed strength necessary to prevent the fixing hardware 10 is obtained when the D _2, the length D ₀ of the pin 15, occlusion 13 is more than the sum of the thickness _{D 1} and the distance _{D 2} of. That is, D ₀ , D ₁ and D ₂ have the following relationship.
D ₁ <D ₀ ≦ D ₁ + D ₂ (1)

  As shown in FIG. 1, when fixing the fixing hardware 10 to the threaded reinforcing bar 20, the pin 15 has one end aligned with the surface of the base 12 and the other end protruding into the internal space of the cylindrical portion 11. It is inserted into the hole 13a.

  In order to fix the fixing metal 10 with the pin 15 inserted through the hole 13 a to the screw rebar 20, the opening 11 b of the fixing metal 10 is attached to the end of the screw rebar 20. The cylindrical portion 11 of the fixing metal 10 is screwed into the end of the screw rebar 20 and the fixing metal 10 is tightened using a jig. FIG. 1 shows a state in which the screw rebar is not inserted to a depth at which the screwing strength necessary for preventing the fixing metal 10 from being pulled out is obtained.

  When the screw rebar 20 is inserted into the cylindrical portion 11 to a depth at which a necessary screwing strength between the fixing metal 10 and the screw rebar 20 is obtained, the screw 15 is inserted into the end portion of the pin 15 protruding into the internal space of the cylindrical portion 11. The end face of the reinforcing bar 20 hits. When the fixing hardware 10 is further tightened, as shown in FIG. 2, the end of the screwed rebar 20 pushes the pin 15 within the cylindrical portion 11, so that one end of the pin 15 is removed from the hole 13 a of the closing portion 13. It protrudes outside the fixing hardware 10. FIG. 2 shows a state in which the screw rebar is inserted to a depth at which the screwing strength necessary for preventing the fixing hardware 10 from being pulled out is obtained.

  If one end of the pin 15 protrudes from the surface of the base 12, the screw rebar 20 is inserted into the fixing hardware 10 to a depth where a necessary screwing strength can be obtained. The insertion length of the screw rebar 20 can be confirmed visually by the protruding pin 15.

  Furthermore, if one end of the projecting pin 15 is pushed into the fixing metal 10 with a finger and the other end of the pin 15 does not abut against the end surface of the threaded reinforcing bar 20, the threaded reinforcing bar 20 can obtain a necessary screwing strength. It is confirmed that it has been inserted into the fixing hardware 10 to the depth. That is, the insertion length of the screw rebar 20 can be verified by touching one end of the pin 15.

  In the present embodiment, since the pin 15 protrudes from the fixing hardware 10, the insertion length of the screw rebar 20 can be easily confirmed. The insertion length can be verified by pushing back the protruding pin 15. That is, visual confirmation and tactile verification are possible, and the insertion length of the screw rebar 20 can be known with high reliability.

  In the screwed state, the pin 15 protruding from the base 12 is removed from the hole 13a, and grout (specifically cement milk, epoxy resin, etc.) is injected from the hole 13a of the base 12 of the fixing hardware 10. The injected grout passes through a gap 30 between the end face of the screw rebar 20 and the closing portion 13 of the fixing hardware 10. Since a path from the gap 30 to the clearance between the outer periphery of the screw rebar 20 and the inner periphery of the cylindrical portion 11 of the fixing hardware 10 is secured, the grout is reliably filled in this clearance. Therefore, the screwing strength between the fixing hardware 10 and the screw rebar 20 is further improved.

  Concrete is placed in a state where the fixing hardware 10 is attached to the screw rebar 20. Since the flange 14 of the fixing hardware 10 becomes a resistance against the tensile force in the axial direction of the screw rebar 20, the screw rebar 20 can be well fixed to the concrete. Since the fixing metal 10 and the screw rebar 20 are fixed at a screwing strength necessary for preventing pull-out, the fixing metal 10 is not pulled out even if the screw rebar 20 is pulled. Further, as described above, since the connection between the fixing hardware 10 and the screw rebar 20 is strengthened by the grout, the fixing strength of the screw rebar 20 to the concrete can be further improved.

  Next, another embodiment of the present invention will be described. In these embodiments, components corresponding to those in the first embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted. In the second embodiment shown in FIGS. 3 and 4, the pin is used for confirming the insertion length of the reinforcing bar and is used as a grout inlet. As shown in FIG. 3, the pin 15 is cylindrical and has openings 50 and 51 at both ends. A notch 52 is formed in the peripheral wall at the end of the pin 15.

  In this embodiment, when fixing the fixing metal 10 to the reinforcing bar 20, when the pin 15 is inserted into the hole 13 a of the base 12, one end of the pin 15 is aligned with the surface of the base 12, and the other end where the notch 52 is formed is used. It protrudes into the internal space of the cylinder part 11.

  As described above, when the screw rebar 20 is inserted into the fixing hardware 10 beyond the depth at which the necessary screwing strength is obtained, one end of the pin 15 protrudes from the surface of the base 12 as shown in FIG. . In the state where the fixing metal 10 and the screw rebar 20 are screwed together, grout is injected from the opening 50 of the protruding pin 15. The injected grout passes through the pin 15, passes through the notch 52 and the opening 51, passes through the gap 30 between the closed portion 13 and the screw rebar 20, and the outer periphery of the screw rebar 20 and the cylindrical portion 11 of the fixing hardware 10. The clearance between the inner circumference is filled.

  In this embodiment, the pin 15 used for confirming the insertion length of the screw rebar 20 is not pulled out, and the pin 15 is used as an injection port. Therefore, the screw rebar 20 is fixed to a depth at which a necessary screwing strength can be obtained. The grout can be injected while visually confirming that it is inserted into the hardware 10.

  Not only the opening 51 of the pin 15 but also the notch 52 serves as a grout flow path, so that the grout can be reliably filled into the clearance between the outer periphery of the screw rebar 20 and the inner periphery of the cylindrical portion 11 of the fixing hardware 10. it can.

Next, a third embodiment will be described. In the third embodiment shown in FIG. 5, the pin is provided with a protrusion for preventing falling off. As shown in FIG. 5A, the pin 15 has a cylindrical shape and has openings 50 and 51 at both ends. A notch 52 is formed in the peripheral wall at one end of the pin 15. Further, a protrusion 53 is formed at one end of the pin 15 so as to project radially and outwardly from the outer periphery thereof. Diameter _{D 4} of the projection 53 is larger than the diameter _{D 3} of the hole 13a.

  In this embodiment, when fixing the fixing metal 10 to the screw rebar 20, when the pin 15 is inserted into the hole 13 a, one end of the pin 15 on which the protrusion 53 is not formed is connected to the hole 13 a from the internal space of the cylinder portion 11. Insert it into the base 12 and adjust it to the surface of the base 12.

  Even if the pin 15 moves in the outward direction of the fixing hardware 10, the protrusion 53 hits the concave portion 31 of the closing portion 13, and the pin 15 falls off to the outside of the fixing hardware 10 (opposite the internal space of the cylinder portion 11). Can be prevented.

Further, as shown in FIG. 5B, the pin 15 is formed from a material such as a plastic metal or resin, and the coil spring 16 is provided between the protrusion 53 of the pin 15 and the recess 31 of the fixing hardware 10. It may be provided. When the pin 15 is inserted into the hole 13a, one end of the pin 15 on which the protrusion 53 is not formed is inserted into the coil spring 16 and from the internal space of the cylindrical portion 11 into the hole 13a. Project slightly from The press portion 54 may be formed by lightly crushing one end of the protruding pin 15. Width _{D 5} of the press portion 54 is larger than the diameter _{D 3} of the hole 13a. Even if the pin 15 moves to the inner space side of the cylindrical portion 11, the press portion 54 hits the closing portion 13 and the movement of the pin 15 is prevented. Therefore, the pin 15 does not fall out not only on the outside of the fixing hardware 10 but also on the inner space side of the cylindrical portion 11.

One end of the coil spring 16 abuts against the recess 31, while the other end abuts against the projection 53, and urges the pin 15 toward the internal space of the cylinder portion 11. As the screw rebar 20 is screwed, the pin 15 is pushed out of the fixing hardware 10. However, even if the pin 15 further moves in the same direction, it is pushed back to the original position by the biasing force of the coil spring 16. Therefore, the insertion length can be confirmed only by visual observation of the protruding pin 15 without verifying the insertion length of the screw rebar 20 by pushing the protruding pin 15 with a finger.
As described above, grout is injected from the opening 50 after the fixing metal 10 and the screw rebar 20 are screwed together.

  In the present embodiment, the grout can be reliably injected while ensuring the flow path while visually confirming the insertion length of the screw rebar 20, and the pin 15 does not fall out of the fixing hardware 10.

The present invention is not limited to the above embodiment, and various aspects can be adopted.
In the second embodiment, the hollow pin 15 is used as the grout injection port. However, after confirming the insertion length of the screw rebar 20, the pin 15 may be removed from the hole 13 a and the grout may be injected from the hole 13 a of the base 12. .
In the third embodiment, the protrusion 53 is formed at the end of the pin 15, but as shown in FIG. 6, the outer periphery at a distance from the end, for example, from the vicinity of the apex of the notch 52 in the radial direction and outward direction. The protrusion 53 may be formed by overhanging.
A plurality of notches 53 may be formed. If a plurality of cutouts are arranged radially on the peripheral wall of the pin 15, the grout can be filled evenly.
Although the threaded reinforcing bar 20 is used as the reinforcing bar, the threaded reinforcing bar 20 may not be used.

  The present invention can be used to fix screw rebars to concrete.

DESCRIPTION OF SYMBOLS 10 Fixing metal object 11 Cylinder part 12 Base 13 Closure part 13a Hole 14 Gutter part 15 Pin 16 Coil spring 16
20 Screw Reinforcing Bar 30 Clearance 31 Between Screw Reinforcing Bar and Closed Portion Recess 50, 51 Opening 52 Notch 53 Projection 54 Press Part

Claims (5)

A cylindrical portion to which the end of the reinforcing bar is screwed, a base that closes one end of the cylindrical portion and has a hole connected to the internal space of the cylindrical portion, and a flange that protrudes radially and outwardly from the outer periphery of the cylindrical portion A fixing hardware provided with a portion, and screwed to a reinforcing bar,
Prepare a pin longer than the thickness of the base,
In a state where this pin is inserted into the hole so as to be movable in the axial direction of the hole, the cylindrical portion is screwed to a reinforcing bar,
When the end of the screwed rebar pushes the pin inside the cylindrical portion, the pin protrudes from the base, and the insertion length of the rebar can be visually confirmed. How to fix. The pin has a cylindrical shape with both ends open,
The grout is injected from one end of the pin in a state where the pin is inserted into the hole of the base after the screwing is completed, and the grout is filled in a gap between the fixing hardware and the reinforcing bar. A method of fixing the fixing hardware according to 1 to a reinforcing bar.   2. The fixing according to claim 1, wherein after the screwing is completed, the pin protruding from the base is pulled out, grout is injected from the hole, and the gap between the fixing metal and the reinforcing bar is filled with grout. A method of fixing hardware to reinforcing bars. In the pin used in the method of claim 2,
A reinforcing bar insertion length confirmation pin, characterized in that a grout is formed in the peripheral wall of the other end. In the pin used in the method of claim 2,
A reinforcing bar insertion length confirmation pin, comprising: a protrusion for preventing a protrusion projecting radially and outwardly from an outer periphery, wherein the diameter of the protrusion is larger than the diameter of the hole.

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