JP2003213841A - Anchor hardware for threaded reinforcement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount an anchor hardware for anchoring a threaded reinforcement to concrete, to the threaded reinforcement while reducing the waste of grout. <P>SOLUTION: This anchor hardware 10 is provided with a cylindrical part 11 for the threaded reinforcement to pass through, and an annular collar part 12 projected radially outward from the cylindrical part 11. A filler hole 13 is formed in the center of the cylindrical part 11. An internal thread 15 screwed with the threaded reinforcement is formed on the inner periphery of the cylindrical part 11, and an annular groove 16 is formed on the inner periphery of the center of the cylindrical part 11. The annular groove 11 is continuous with the filler hole 13 and cuts off the thread ridge of the internal thread 15. When grout is filled from the filler hole 13 in the state of the anchor hardware being mounted to the threaded reinforcement, the grout comes around to the annular groove 16 and reaches both end openings 14 of the cylindrical part while filling a clearance between the cylindrical part and the threaded reinforcement form the annular groove 16. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal product used for fixing screw rebar to concrete.

[0002]

2. Description of the Related Art For example, in a beam of a reinforced concrete structure, an end portion of a main reinforcement extending in the horizontal direction is located at an intersection (portion) with a column. Various attempts have been made in the past to fix the end portion of the main bar to the concrete, but an example thereof is disclosed in JP-A-6-57952.

In the embodiment shown in FIG. 5 of the above publication, a screw reinforcing bar is used as a main bar, and an end portion of this screw reinforcing bar penetrates a fixing metal member. The fixing hardware has a tubular portion having an internal thread on the inner periphery thereof, and an annular flange portion projecting radially outward from the outer periphery of one end of the tubular portion. An injection port is formed in the center of the cylindrical portion. In a state in which the tubular portion is screwed to the end portion of the screw rebar, the grout injected from this inlet is filled in the clearance between the inner circumference of the tubular portion and the outer circumference of the screw rebar and hardened. Thus, the fixing hardware is fixed to the screw rebar.

Concrete is poured in the state where the fixing hardware is fixed to the end of the screw rebar as described above. The brim of the anchoring metal embedded in the concrete serves as a resistance against the axial force of the screw rebar and helps the anchoring of the screw rebar.

[0005]

In the case of the fixing hardware having the above structure, since the screw rebar and the fixing hardware are screwed together, the connection strength between them is high, but there are the following drawbacks. Depending on the clearance state between the screw reinforcement and the fixing metal near the inlet, the time required for the grout to reach both openings while satisfying the clearance between the fixing metal and the screw reinforcement may differ. In this case, after the grout reaches the one end opening, the grout injection must be continued until the grout reaches the other end opening. As a result, the grout continues to leak from the one-end opening, waste of the grout occurs, and it takes time to process the leaked grout.

[0006]

In order to solve the above-mentioned problems, the present invention has a tubular portion having open both ends and having an internal thread on the inner periphery thereof, through which a threaded reinforcing bar is threadedly inserted.
An annular collar portion that projects radially and outwardly from the tubular portion, is fixed to the screw rebar by a grout that fills the clearance between the tubular portion and the screw rebar, and the screw rebar is fixed to concrete. In the fixing hardware to be made, an injection port for injecting the grout is formed in the center of the cylindrical part, and an annular groove continuous with the injection port is formed in the inner periphery of the center of the cylindrical part. In this state, the annular groove is connected to the opening at both ends through the clearance between the tubular portion and the screw rebar.

[0007] According to the fixing hardware, the grout injected from the injection port wraps around the annular groove connected to the injection port, and goes from there to the openings at both ends through the clearance between the tubular portion and the screw rebar. Since the grout once wraps around the annular groove in this manner, the grout can be supplied without being biased by the clearance condition near the injection port, and the grout can reach the openings at both ends almost at the same time. Therefore, it is possible to reduce the waste of grout and reduce or eliminate the trouble of leak grout treatment.

In the fixing hardware, an auxiliary annular groove may be formed between the central annular groove and the openings at both ends so as to be equidistant from the central annular groove. With this configuration, even if the supply pressure of the grout becomes weaker at a position away from the inlet, the grout can be supplied uniformly to the clearance between the tubular portion of the fixing metal piece and the screw rebar.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the fixing metal member 10 made of a casting has a cylindrical tubular portion 11
And a ring-shaped collar portion 12 which is provided on the outer periphery of one end of the tubular portion 11 and projects radially and outwardly. A grout injection port 13 is formed in the central peripheral wall of the cylindrical portion 11. Both ends of the tubular portion 11 have openings 14.

As shown in FIGS. 1 and 3 (A), the cylindrical portion 11
A female screw 15 is formed on the inner circumference of the. An annular groove 16 is formed on the inner circumference of the center of the tubular portion 11. The groove 16 is continuous with the injection port 13 and blocks the thread of the female screw 15. The diameter of the groove 16 is equal to the root diameter of the female screw 15, and the strength of the tubular portion 11 does not decrease due to the formation of the groove 16. If the wall thickness of the tubular portion 11 can be increased, the diameter of the groove 16 may be larger than the root diameter of the female screw 15.

Before describing the operation of the fixing hardware 10 having the above-described structure, an outline of the reinforced concrete building shown in FIG. 4 will be described. This structure is provided with a pillar rebar cage A and a beam rebar cage B as a framework. The column rebar cage A has main bars 20 extending vertically and annular bars 30 connected to the main bars 20 so as to surround the main bars 20. Similarly, the beam rebar cage B also has a main bar 40 extending horizontally and an annular bar 50 connected to the main bar 40.

In the joint portion C of the building, the main reinforcement 40 of the beam reinforcement cage B is inserted into the pillar reinforcement cage A. The main bar 40 is a screw rebar, and as shown in FIGS. 2 and 3 (B), has a threaded joint 42 at a site facing the outer periphery of the base 41 by 180 degrees. A flat surface portion 43 (a portion where no threaded joint is formed) is formed between the threaded joints 42.

As shown in FIGS. 2, 3 (C) and 4, the fixing metal fittings 10 are attached to the ends of the main bars, that is, the screw reinforcing bars 40 in the joint C. In this mounted state, the threaded reinforcing bar 40 penetrates the tubular portion 11 with the threaded joint 42 screwed into the female screw 15 of the tubular portion 11 of the fixing hardware 10.

As described above, the fixing hardware 10 is attached to the screw rebar 4
The injection port 13 of the fixing hardware 10 in the state of being attached to the end portion of 0.
From grout (specifically epoxy resin, not shown)
Inject. The injected grout is the above-mentioned screw rebar 40
Between the outer circumference of the cylinder and the inner circumference of the cylinder part 11
And cure. As a result, the fixing hardware 10 is fixed to the end of the screw reinforcing bar 40. In the present embodiment, when an axial load is applied between the fixing hardware 10 and the screw rebar 40, the female screw 15 of the fixing metal 10 and the threaded joint 42 of the screw rebar 40 bear the entire load via the grout. Therefore, the connection strength is high.

With the fixing hardware 10 attached to the screw rebar 40, concrete 60 is poured as shown in FIG. The flange portion 12 of the fixing hardware 10 resists the axial pulling force of the main bar 40, so that the screw rebar 40 can be satisfactorily fixed to the concrete 60. Therefore, it is not necessary to bend the end portion of the screw reinforcing bar 40 at the joint portion B to form the anchor portion.

Next, the operation of the features of the present invention will be described.
Since the annular groove 16 is formed in the inner circumference of the center of the tubular portion 11, the grout injected from the injection port 13 is
It goes around to the annular groove 16 continuous with and goes toward the openings 14 at both ends through the clearance between the tubular portion 11 and the screw rebar 40. Since the grout once goes around the annular groove 13 in this manner, the grout can be supplied without being biased by the clearance condition in the vicinity of the inlet 13, and the grout can reach the openings 14 at both ends almost at the same time. for that reason,
It is possible to reduce the waste of grout and reduce or eliminate the trouble of processing the leaked grout.

The grout preferentially fills the space between the flat surface portion 43 of the screw rebar 40 and the inner circumference of the cylindrical portion 11,
Since the grout has a high viscosity, the grout also spreads in the circumferential direction and fills the clearance between the threaded joint 42 of the threaded reinforcing bar 40 and the tubular portion 11.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the components corresponding to those in the first embodiment are designated by the same reference numerals in the figure and their detailed description is omitted. In this embodiment, in the inner circumference of the fixing hardware 10, the central annular groove 16 and the both end openings 1 are provided.
A pair of auxiliary annular grooves 17 located in the middle of 4 are formed. These auxiliary annular grooves 17 are equidistant from the central annular groove 16. In this embodiment, even if the supply pressure of the grout weakens at a place away from the inlet 13, the auxiliary annular groove 17 allows the grout to be spread in the circumferential direction, and the cylindrical portion 11 of the fixing hardware 10 and the screw rebar 40 are connected to each other. The clearance between can be supplied evenly.

The present invention is not limited to the above embodiment, and various modes are possible. For example, the flange portion of the fixing hardware may be provided not at the end of the cylindrical portion but at an intermediate portion in the axial direction. The tubular portion and the collar portion of the fixing hardware may be polygonal.

[0020]

As described above, according to the present invention, it is possible to eliminate grout waste with a simple structure in which the annular groove is formed in the fixing hardware.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a fixing hardware according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which the identified deposit is attached to a screw rebar.

3A is a cross-sectional view of the fixing metal object along the line Xa-Xa in FIG. 1, FIG. 3B is a cross-sectional view of the screw reinforcing bar along the line Xb-Xb in FIG. 2, and FIG. At Xc-
It is a cross-sectional view of the fixing metal fitting and the screw rebar in a screwed state along the Xc line.

FIG. 4 is a vertical cross-sectional view of a joint portion of a concrete structure using the identified deposit.

FIG. 5 is a vertical sectional view showing a fixing hardware according to a second embodiment of the present invention.

[Explanation of symbols]

10 Fixing hardware 11 tube 12 collar part 13 inlet 14 openings 15 female screw 16 annular groove 17 Auxiliary annular groove 40 main bar (screw rebar) 42 screw joint

Claims (2)

[Claims] 1. A cylindrical portion having open both ends and having an internal thread on the inner periphery thereof, through which a threaded reinforcing bar is threadedly inserted, and an annular collar portion projecting radially and outwardly from the cylindrical portion. In the fixing hardware fixed to the screw rebar by the grout filled in the clearance between the cylindrical part and the screw rebar, and fixing the screw rebar to concrete, the grout is injected into the center of the cylindrical part. An injection port for forming is formed, and an annular groove continuous with this injection port is formed on the inner periphery of the center of the cylindrical portion.In the state before grout injection, this annular groove is formed through the clearance between the cylindrical portion and the screw rebar. A fixing hardware for a screw rebar characterized by being connected to the openings at both ends. 2. An auxiliary annular groove that is equidistant from the central annular groove is formed in the inner circumference of the cylindrical portion, between the central annular groove and the openings at both ends.
Fixing hardware for screw rebar described in.