JP6731392B2 - Method of correcting misalignment of pillar steel frame - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for correcting misalignment of a steel frame for a pillar in a method of constructing a steel frame pillar.

In constructing a steel column, there is a difference between the lower steel frame for the column installed earlier and the upper steel frame for the column that is placed on the lower steel frame and is added to the lower steel frame. When this occurs, i.e. when a horizontal offset of the upper steel frame with respect to the lower steel frame occurs, this is corrected.

Conventionally, the correction of misalignment is to apply a horizontal force to the upper steel frame by using the lower steel frame as a reaction force support, which causes the upper steel frame to slide on the lower steel frame and to cause horizontal displacement of the upper steel frame. It is done by causing. However, the work of sliding the upper steel frame, which is a heavy object, on the lower steel frame requires a great deal of labor.

JP, 2002-194897, A

The present invention provides a misalignment correction method that contributes to reduction of the labor required to correct misalignment of a pillar steel frame in the method of building a pillar.

The present invention corrects a misalignment that occurs between a lower steel frame for a pillar previously installed for building a column and an upper steel frame for a column placed on the lower steel frame. According to the method. How to correct the eye difference is exerting a horizontal force on the upper steel, at the same time as the horizontal direction force of application to the upper steel, prior to application of the horizontal force, or, the horizontal force Is applied to the lower steel frame or the upper steel frame after the start of the application.

The present invention is based on the scientific and technical knowledge that the friction coefficient of two similar objects in contact with each other during relative motion is smaller than the friction coefficient before relative motion when the contact surfaces of both objects are oscillated. .. In the present invention, when the horizontal force is applied to the upper steel frame, the lower steel frame or the upper steel frame is vibrated. As a result, vibration is generated on the contact surfaces of the upper and lower steel frames, and the upper steel frame that receives the horizontal force slides on the lower steel frame with a relatively small resistance. From this, it is possible to reduce the magnitude of the horizontal force to be applied to the upper steel frame in order to correct the misalignment of the pillar steel frame, thereby reducing the labor required for correcting the misalignment. be able to.

The vibration can be applied by, for example, applying an intermittent torque to the bolt attached to the upper steel frame through an impact wrench. Alternatively, for example, it can be performed by operating a high frequency vibration device attached to the upper steel frame.

Further, the horizontal force is applied to the upper steel frame by, for example, contacting both upper and lower steel frames rotatably supported by the lower steel frame or the upper steel frame through a shaft member about a horizontal axis. It can be performed through a jig having one end and the other end that are possible, and the one end is expandable.

An example of a jig for correcting the misalignment between the upper and lower steel frames for the column, the upper steel frame for the column placed on the lower steel frame, and the upper and lower steel frames installed on the lower steel frame It is a side view which shows and. FIG. 2 is a side view similar to FIG. 1 after correction of misregistration. It is a figure which shows the experimental equipment used for implementation of the miscorrection method.

As shown in FIG. 1, in erection of a steel frame column that constitutes a building to be constructed, a steel frame for a column (a lower steel frame) 10 that is installed first and extends vertically is placed on another steel frame (for an upper column). Steel frame 12) is placed and then added to the lower steel frame 10. At this time, there is a misalignment between the lower steel frame 10 and the upper steel frame 12 placed on the lower steel frame, that is, a shift a (FIG. 1) in the horizontal direction of the upper steel frame 12 with respect to the lower steel frame 10. May occur. The misalignment correction method according to the present invention is applied to the work performed to eliminate the deviation a.

Each of the two steel frames 10 and 12 shown in the figure is made of a square steel pipe having a square cross-sectional shape, and each steel frame 10 and 12 has four side surfaces. The upper steel frame 12 is hung on the lower steel frame 10 for placement on the lower steel frame 10 by using a toothpicking machine (not shown) such as a crane.

For convenience of suspending the steel frames 10 and 12 by the toothpicking machine, plate-shaped erection pieces 14 and 16 are attached to the upper and lower ends of the steel frames 10 and 12, respectively. Each erection piece 14 and 16 is located at the center of each side of the square, which is the cross-sectional shape of each steel frame 10 and 12, that is, the center in the width direction of the side surface, with respect to the side surface of each steel frame 10 and 12. They are orthogonal and extend vertically. The illustrated erection pieces 14 and 16 each have a rectangular shape and are fixed to the steel frames 10 and 12 by welding. Further, each erection piece 14, 16 is provided with a hole 18 penetrating it.

The correction of the misalignment includes applying a horizontal force to the upper steel frame 12, applying the horizontal force to the upper steel frame 12, simultaneously with, or before or after applying the horizontal force. This is performed by applying vibration to the steel frame 10 or the upper steel frame 12.

By exerting the horizontal force on the upper steel frame 12, the upper steel frame 12 can be slid on the lower steel frame 10, thereby eliminating the displacement a. In the present invention, when the horizontal force is applied to the upper steel frame 12, the lower steel frame 10 or the upper steel frame 12 is vibrated. As a result, vibration is generated in the contact surfaces 20 of the upper and lower steel frames 10 and 12, and the sliding resistance of the upper steel frame 12 with respect to the lower steel frame 10 is reduced. As a result, it is possible to reduce the magnitude of the horizontal force to be applied to the upper steel frame 12 and the labor required to correct the misalignment.

To apply the vibration to the lower steel frame 10 or the upper steel frame 12, for example, a bolt 21 (see FIG. 3) described below is attached to the lower steel frame 10 or the upper steel frame 12, and the bolt 21 is interrupted by an impact wrench (not shown). It can be performed by applying a specific rotational force. Alternatively, for example, a high-frequency vibration device 22 (see FIG. 3) described below is attached to the side surface of the lower steel frame 10 or the upper steel frame 12, and the high-frequency vibration device 22 can be operated.

The horizontal force can be applied to the upper steel frame 12 by using any method and means, for example, the jig 24 described later, the hydraulic jack 50, or the like. In the example shown in FIGS. 1 and 2, the lower steel frame 10 is caused to carry a reaction force, that is, the lower steel frame 10 is used as a reaction force support body to operate the jig 24 attached to the lower steel frame 10. As a result, a horizontal force is applied to the upper steel frame 12. The jig 24 can be attached to the upper steel frame 12 instead of the illustrated example.

The jig 24 includes a lever member 26, a shaft member 28, and a screw member 30. The lever member 26 has a plate-shaped main body 26a, a block-shaped one end portion (lower end portion in the drawing) 26b connected to the main body, and a block-shaped other end portion (the same upper end portion) 26c. The shaft member 28 includes a bolt penetrating the main body 26a of the lever member 26 and a nut screwed to the bolt. In the illustrated example, the screw member 30 is a hexagon socket head cap screw, and is screwed into one end portion (lower end portion) 26b of the lever member 26 and penetrates the one end portion. The jig 24 is connected to the erection piece 14 (therefore, the lower steel frame 10 to which the erection piece is fixed) via the shaft member 28 that is passed through the hole 18 of the erection piece 14 of the lower steel frame 10. It is rotatably mounted and supported around. Here, the screw member 30 and the other end portion 26c of the lever member 26 form an extendable end portion of the jig 24 and the other end portion of the jig 24, respectively, and contact the lower steel frame 10 and the upper steel frame 12 respectively. It is possible.

According to this jig 24, the tip portion 30a of the screw member 30 can be pressed against the lower steel frame 10 by rotating the screw member 30 and advancing the tip portion 30a thereof toward the side surface of the lower steel frame 10. it can. As a result, the lever member 26 rotates clockwise around the shaft member 28 as viewed in FIG. 1, and the other end portion (upper end portion) 26c of the lever member 26 abuts the side surface of the upper steel frame 12.

When the rotating operation of the screw member 30 is continued, the lever member 26 slides on the surface of the upper steel frame 12 at the other end 26c, while the lower erection piece 14 (lower steel frame 10) is used as a reaction force support body. A horizontal force (pressing force) is applied to 12. As a result, the upper steel frame 12 that receives the horizontal force slides horizontally on the lower steel frame 10, and the value of the deviation a gradually decreases accordingly.

The lever member 26 exhibits the function of a lever in correcting the misalignment. Therefore, by applying a relatively small force to one end (lower end) 26b of the lever member 26, a relatively large force is transmitted from the other end (upper end) 26c of the lever member 26 to the upper steel frame 12. be able to. Also by this, the force required for the rotation operation of the screw member 30 for applying the force to the one end portion 26b of the lever member 26 can be made relatively small, and thus the misalignment can be corrected. It is possible to further reduce the labor required.

Next, referring to FIG. 3, reference numeral 40 indicates the experimental equipment used for carrying out the method for correcting misalignment according to the present invention.

In the experimental facility 40, on a surface plate 44 installed on the ground 42, a steel frame made of a rectangular steel pipe similar to the one described above (hereinafter, for convenience of understanding, reference numeral 10 is attached to The steel frame) is fixed. The lower steel frame 10 extends vertically upward. The same four erection pieces 14 as described above are attached to the upper portion of the lower steel frame 10. Further, on the lower steel frame 10, a steel frame made of the above-mentioned square steel pipe (also referred to as reference numeral 12 and referred to as an upper steel frame) is placed. The same four erection pieces 16 as described above are attached to the lower portion of the upper steel frame 12.

A weight 46 having a weight of 10 tons, which is suspended by a crane (not shown) via a wire 45, is placed on the upper steel frame 12, and a vertical load is applied to the upper steel frame 12. The lower steel frame 10 and the upper steel frame 12 have a length of 800 mm and 1200 mm, respectively. The length and thickness of one side of each steel frame 10 and 12 are 500 mm and 19 mm, respectively. The upper steel frame 12 is in a state of being aligned with the lower steel frame 10, that is, the above-mentioned misalignment does not exist (a=0).

A support member 48 is attached to the upper portion of the lower steel frame 10. Two sets (only one set is shown) of hydraulic jacks 50 and load cells 52 are supported on the support member 48. The hydraulic jacks 50 and the load cells 52 of each set are arranged in series toward the side surface of the upper steel frame 12. Further, the two sets of hydraulic jacks 50 and load cells 52 are arranged in parallel with one erection piece 16 of the upper steel frame 12 interposed therebetween. According to this, when the hydraulic jacks 50 of both sets are extended, the reaction force is exerted on the lower steel frame 10 via the support member 48 to exert the horizontal force (horizontal load) on the upper steel frame 12 and The upper steel frame 12 can be slid on the steel frame 10. The magnitude of the horizontal force is measured by the load cell 52.

Two displacement gauges 54 for measuring the sliding distance of the upper steel frame 12 are attached below the side surface of the upper steel frame 12, more specifically, below the attachment position of the erection piece 16. Both displacement gauges 54 extend horizontally on the extension of both hydraulic jacks 50.

Further, a bolt 21 that extends horizontally above the attachment position of the erection piece 16 is attached to the side surface of the upper steel frame 12. Vibration can be applied to the upper steel frame 12 by applying intermittent torque to the bolt 21 with an impact wrench (not shown). Alternatively, instead of this, the high frequency vibration device 22 is attached. By operating the high frequency vibration device 22, vibration can be applied to the upper steel frame 12.

Using the experimental equipment 40, both the hydraulic jacks 50 are operated while applying vibration to the upper steel frame 12 by using the impact wrench and the high-frequency vibration device 22, respectively, and a horizontal direction is applied to the upper steel frame 12 via the load cell 52. Experiments 1 and 2 for applying force were performed. The operating frequency of the impact wrench used in Experiment 1 is 2,000 rotations/minute, and the operating frequency of the high-frequency vibration device 22 used in Experiment 2 is 230 rotations/minute. The sliding distance of the upper steel frame 12 with respect to the lower steel frame 10 was measured by the displacement meter 54. Further, for reference, an experiment (reference experiment) in which both hydraulic jacks 50 apply a horizontal direction force to the upper steel frame 12 without vibrating both the upper steel frame 12 and the lower steel frame 10 is also performed. It was In each of Experiment 1, Experiment 2 and Reference Experiment, two trials were performed.

The results of Experiment 1, Experiment 2 and Reference Experiment are shown below.

From the results of the experiment, when the horizontal force is applied by applying vibration to the upper steel frame 12, the value of the horizontal force required for the load (maximum) is compared with the case where the horizontal force is applied without applying vibration. It has been confirmed that it is possible to reduce the value), and that it is significant to apply the vibration in correcting the misalignment of the column steel frame.

10 Lower Steel Frame 12 Upper Steel Frame 14, 16 Erection Piece 18 Hole 20 Contact Surfaces of Both Upper and Lower Steel Frames 21 Bolt 22 High Frequency Vibration Device 24 Jig 40 Experimental Equipment 50 Hydraulic Jack

Claims (4)

A method for correcting a misalignment that occurs between a lower steel frame for a pillar that was previously installed for building a pillar and an upper steel frame for a pillar that is placed on the lower steel frame. ,
Exerting a horizontal force on the upper steel frame,
Simultaneously with said horizontal force application to the steel of the upper, prior to assignment of the horizontal force, or, after the start of application of the horizontal force, to give vibration to steel or the upper steel of the lower Improper correction method including The method for correcting a misalignment according to claim 1, wherein the vibration is applied by applying an intermittent torque to a bolt attached to the upper steel frame through an impact wrench. The method for correcting a misalignment according to claim 1, wherein the applying of the vibration is performed by operating a high-frequency vibrating device attached to the upper steel frame. The application of a horizontal force to the upper steel frame is supported by the lower steel frame or the upper steel frame via a shaft member so as to be rotatable about a horizontal axis, and is capable of contacting both upper and lower steel frames, respectively. The method for correcting a misalignment according to any one of claims 1 to 3, wherein a jig having a portion and the other end, the one end being expandable, is used.

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