JP2001295472A - Method for introducing axial force into reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of dispensing with large-scale equipment and shortening the term of works for introducing axial force into a reinforcing bar. SOLUTION: This method for introducing axial force into the reinforcing bar is characterized in that the principal part is constituted by a first member 1 formed by making one end of a steel-made sleeve 1A press contact with one end of the reinforcing bar 1C and providing the inner surface of the other end of the sleeve 1A with a female screw part 1B, a second member 2 formed by making one end of a steel-made sleeve 2A press contact with one end of a reinforcing bar 2C separately from the first member 1 and providing the inner surface of the other end of the sleeve 2A with a female screw part 2B which is threaded inverse to the above female screw part 1B, and a connecting bolt 3 having male screw parts 3A, 3B respectively screw-engaged with the female screw parts 1B, 2B formed on both sides of a fixing nut 3C, and the first member 1 and the second member 2 are screw-engaged with each other by the connecting bolt 3 to thereby introduce pulling axial force into both of the reinforcing bars 1C, 2C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for introducing an axial force to a reinforcing bar, and more particularly, to a method for introducing a tensile axial force when a screw type reinforcing bar is used as a tie rod.

[0002]

2. Description of the Related Art There is a VSL method as one of conventional methods for improving seismic resistance by introducing a tensile axial force to a reinforcing bar of a large span beam or column. The VSL method is a prestressed fixing method, and a post-tension method and an anchor method using a PC steel strand are well known. For example, when a post-tension method is used as a method of introducing an axial force to a floor of a large span L (for example, 66.3 m) of a coal storage yard as shown in FIG. Concrete is cast in a state where the PC steel is not attached to the concrete, and after confirming the predetermined strength of the concrete, a tensile force is applied to the PC steel by a jack, and both ends of the PC steel are fixed with a fixing tool in that state, A method of applying compressive force to concrete has been used.

[0003]

However, the conventional VSL method uses one to 55 PC strands, so that the introduction force per cable is, for example, one.
Since the capacity is as large as 2.5t to 118.7t, it is necessary to use a hydraulic device or a hydraulic device to introduce the axial force. For this reason, there has been a problem that the apparatus becomes large-scale, and the construction period becomes longer due to the delivery time of the apparatus, assembling / adjustment, and the like, resulting in an increase in cost. The present invention has been made in order to solve the above-mentioned problem, and an object of the present invention is to provide a method that does not require a large-scale device and can shorten the period of work for introducing an axial force into a reinforcing bar.

[0004]

SUMMARY OF THE INVENTION The gist of the method for introducing an axial force into a reinforcing bar according to the present invention, which has been made to solve the above-mentioned problems, is to provide one end of a steel sleeve at one end of the reinforcing bar. Crimping, a first member provided with a female screw portion on the inner surface of the other end of the sleeve, separately from the first member, crimped one end of a steel sleeve to one end of a reinforcing bar, A second member provided with a female screw portion of a reverse screw to the female screw portion on the inner surface of the other end of the sleeve, and a male screw portion respectively screwed with the female screw portion are formed on both sides of the fixed nut, respectively. A main part is formed from the connecting bolts, and the first member and the second member are screwed together with the connecting bolts to introduce a tensile axial force to both rebars. .

[0005] As described above, the first member in which one end of the steel sleeve is crimped to one end of the rebar and the female screw portion is provided on the inner surface of the other end of the sleeve, and Separately,
A second member in which one end of a steel sleeve is pressure-bonded to one end of a reinforcing bar, and a female screw part of a reverse screw to the female screw part is provided on an inner surface of the other end of the sleeve; The first member and the second member are connected by the connection bolt by forming a main portion from a male screw portion that can be screwed with the connection nut formed on each side of the fixed nut. It can be easily screwed together with a tool and human power, and a tensile axial force can be introduced into both rebars. As a result, a large-scale hydraulic or hydraulic device is not required, and the construction period can be shortened.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for introducing an axial force to a reinforcing bar according to the present invention will be described with reference to the drawings. FIG. 1 is a simplified diagram showing one embodiment of a method for introducing an axial force into a reinforcing bar according to the present invention. The constituent member of the present invention includes a first member 1
And a second member 2, and a connection bolt 3 connecting the first member 1 and the second member 2 to form a main part.
The first member 1 is a reinforcing bar (for example, D5
1) One end of a steel sleeve 1A is crimped to one end of 1C, and a female screw portion 1B is provided on the inner surface of the other end of the sleeve 1A. The second member 2 includes a steel sleeve 2 at one end of a reinforcing bar (for example, D51) 2C that is a screw-type reinforcing bar.
A of one end of the sleeve 2A, and a female screw part 2 of a reverse thread to the female screw part 1B of the first member 1 is formed on the inner surface of the other end of the sleeve 2A.
B is provided. The connecting bolt 3 has male screw portions 3A and 3B that can be screwed with the two female screw portions 1B and 2B, respectively, provided on both sides of the fixing nut 3C. A fixing nut 3 </ b> C is provided at the center of the connection bolt 3. Also, the two male screw portions 3A, 3B
A lock nut 4A for fixing the connecting bolt 3 at the other end of the two sleeves 1A and 2A so that the connecting bolt 3 is rotated and the tensile axial force is not changed after a tensile axial force is applied to the reinforcing bar. , 4B are provided respectively.

[0007] Of these components, the fixing nut 3C of the connecting bolt 3 is rotated by human power using a tool to screw the first member 1 and the second member 2 into the connecting bolt 3. By pulling the two members 1 and 2 toward the center of the connecting bolt 3, a tensile axial force can be introduced to both rebars 1C and 2C. As the tensile axial force, for example, after an axial force meter is attached and the axial force is measured, a torque can be introduced manually with a safety factor of 1.1. Both rebars 1C, 2C
After applying a pulling axial force to the two sleeves 1A and 2A
At the other end of the connection bolts 3A and 4B, connecting bolts 3
Is fixed. In this way, even when the connecting bolt 3 is left for a long time, it is possible to prevent the connecting bolt 3 from being loosened and the tensile axial force of the rebars 1C, 2C from being reduced.

[0008] The method of introducing an axial force into a reinforcing bar according to the present invention can be implemented with various appropriate changes as necessary without departing from the technical scope of the present invention. For example, an axial force may be introduced by a turnbuckle method. In FIG. 1, the female screw portion is a parallel screw, but may be a taper screw. Also,
Although the male screw portion of the connection bolt is a parallel screw, a tapered screw such as a nipple joint may be used. Also, trapezoidal screws may be used.

[0009]

According to the present invention described above, the following effects can be obtained. (1) A first member in which one end of a steel sleeve is crimped to one end of a reinforcing bar, and a female screw portion is provided on an inner surface of the other end of the sleeve, and a reinforcing bar separately from the first member. A second member in which one end of a steel sleeve is crimped to one end of the sleeve, and a female screw part of a reverse screw is provided on the inner surface of the other end of the sleeve, and the female screw part The first part and the second member are tooled with the connection bolts by forming the main part from male screw parts that can be screwed together, and connection bolts provided respectively on both sides of the fixed nut. Can be easily screwed together with human power, and a tensile axial force can be introduced into both rebars. As a result, a large-scale hydraulic device or the like becomes unnecessary, and the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a method for introducing an axial force into a reinforcing bar according to the present invention.

FIG. 2 is a diagram for explaining a conventional method of introducing an axial force into a reinforcing bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 1A, 2A Sleeve 1B, 2B Female screw part 3 Connecting bolt 3A, 3B Male screw part 3C Fixed nut 4A, 4B Lock nut

Claims (1)

[Claims] 1. A first member in which one end of a steel sleeve is press-bonded to one end of a reinforcing bar, and a female screw portion is provided on an inner surface of the other end of the sleeve. A second member in which one end of a steel sleeve is press-fitted to one end of a reinforcing bar, and a female screw part of a reverse screw to the female screw part is provided on an inner surface of the other end of the sleeve; The main part is composed of connecting bolts formed on both sides of the fixing nut, respectively, and a male screw part to be screwed with each other is formed by screwing the first member and the second member together with the connecting bolt. A method for introducing axial force to a reinforcing bar, wherein a tensile axial force is applied to both reinforcing bars.