JP2021155909A - High-tension bolt fastening structure of square steel pipe column - Google Patents

Abstract

To provide a method simplified in processing without using a difficult welding technique in a high-tension bolt fastening structure using a square steel pipe column for a steel structure building, and a method allowing adjustment of positions of a nut and a washer in a minute range in construction.SOLUTION: A square steel pipe column has multiple bolt holes corresponding to bolt holes of a beam end face and prepared holes for welding at places for bolt jointing with an H-shaped steel beam end part. The column has a structure of abutting a rectangular doubling plate having multiple bolt through-holes and nut holding metal fittings for restricting the nuts to an inner wall face of the square steel pipe column, applying slot welding and welding to the doubling plate from the prepared holes for welding of the square steel pipe, and nut holding metal fittings formed by overlapping, on the doubling plate used in the structure, nut covers formed by processing a thin plate into a truncated cone shape onto nut restriction plate faces cut out larger than the nut shape.SELECTED DRAWING: Figure 1

Description

The present invention relates to a high-strength bolt fastening structure of a nut holding metal fitting inside a square steel pipe column, in particular, using a square steel pipe column in a steel structure building.

In recent years, a bidirectional ramen structure using a square steel pipe column as a column material and an H-shaped steel as a beam material has been widely used. For example, as a means for obtaining a bidirectional ramen structure as shown in FIG. 7, a through method is used in which a square steel pipe is cut at both flange positions of H-shaped steel, and a diaphragm plate is sandwiched therein and rejoined. The diaphragm type bracket method is generally known.

As a construction method that does not divide the square steel pipe column, Japanese Patent Application Laid-Open No. 2004-169298 (first known example) in an outer diaphragm type in which two upper and lower diaphragms are welded to the outer circumference of the column is disclosed.

Next, the inner diaphragm type of the method of welding the diaphragm inside the column is shown as follows as the following as a guideline for designing the steel structure joint of the Architectural Institute of Japan (a) The inner diaphragm type of the welded assembly column, (b). ) The inner diaphragm type of the press-formed square steel pipe, and (c) the inner diaphragm type manufactured by dividing the panel are shown.

In Japanese Patent Application Laid-Open No. 2006-291613 (second known example), a one-sided friction attachment plate is brought into contact only with the inner surface side of the square steel pipe column, a high-strength bolt is inserted from the outer surface side of the square steel pipe column, and a screw portion is attached. A structure screwed into a nut protruding from a plate is disclosed.

Japanese Unexamined Patent Publication No. 2004-169298 Japanese Unexamined Patent Publication No. 2006-291613

However, in the example of the through diaphragm type (FIG. 7), although it is possible to obtain high joint rigidity, there is a problem that the column cutting process and the welding work load are heavy. For example, the square steel pipe 1 is cut according to the fault (height) of the H-shaped steel beam 12, and the through diaphragm upper portion 11a and the through diaphragm lower portion 11b 2 are cut at both ends of the cut portion of the square steel pipe 1. The upper and lower flanges (12a, 12b) of the H-shaped steel beam 12 to be joined, the web 12c, the square steel pipe 1 on the upper floor held above the through diaphragm upper portion 11a, and the through diaphragm lower portion 11b. It is a joint with the square steel pipe 1 on the lower floor, which is held at the bottom, including structural elements in the upper, lower, and four directions. Therefore, welding is a concentrated work in a narrow range, and it is necessary to consider the influence of welding heat input, which is a highly difficult joining method.

In the outer diaphragm type of the first known example, the diaphragms 4 and 5 are welded to the outer periphery of the square steel pipe column 1, and the flanges 2a and 2b at the ends of the steel beam 2 are welded to the diaphragms 4 and 5. Is. Therefore, the step of dividing the steel pipe into a plurality of pieces is not required, but the problem is that the welding work load is large as in the through diaphragm type.

In the case of the welded assembly column (a) in the inner diaphragm type in the steel structure joint design guideline of the Architectural Institute of Japan, the plate is cut into each part and the part is manufactured into a column shape with a box-shaped cross section. In the process of doing this, it is a method of assembling by welding while incorporating the diaphragm inside the column. In the case of the press-formed square steel pipe of (b), it is a method in which a divided diaphragm is attached to the inside of a column material in which a plate is formed into a U shape by a press machine, and the column materials are combined and fixed by welding. (C) When the panel is divided and manufactured, it is a method of cutting a square steel pipe column at an intermediate portion of a beam-column joint panel, attaching a diaphragm, and welding the column again. The method of stress transmission of the beam-column joint in the inner diaphragm type is basically the same as that of the through diaphragm type, and the evaluation of rigidity is high, but the problem is that the welding work load is large as in the through diaphragm type. ..

In the second known example, although the construction method reduces the burden of welding work, there remains a problem in workability. For example, as shown in FIG. 1 (b), the one-sided friction auxiliary plate 2 is brought into contact with the upper end of the inside of the square steel pipe column 1b, and the high-strength bolt 3 is inserted into the bolt hole 1o from the outside of the square steel pipe column 1b. This is a method of screwing and fastening to the nut 5 of the nut holder 4 installed in advance via 2o. However, as shown in FIGS. 9 (b) and 9 (c), the positions of the nut 5 and the washer 7 held in the nut holder 4 can be moved in a minute range in the vertical and horizontal directions. Diagonal directions are not possible.

The problem to be solved by the present invention is to solve the above-mentioned conventional problems, and in a square steel pipe column to be joined to an H-shaped steel beam, a non-diaphragm type high-strength bolt fastening structure in consideration of welding workability. When is adopted, the processing is simplified without using a difficult welding technique. Further, in the bolt head rotation method, it is a construction method for preventing the nut from rotating together, and further, it is an object of the present invention to provide a device capable of moving the nut and the washer in a minute range in all directions.

The high-strength bolt fastening structure of the square steel pipe column according to the present invention for solving the above problems is a plurality of bolts that match the bolt holes of the beam end face at the location where the bolt is welded to the H-shaped steel beam end. A splicing plate formed on a rectangular steel pipe column having a hole and a plurality of prepared holes for welding and having a plurality of bolt through holes provided with a nut holding metal fitting for restraining the nut. It is characterized in that it abuts on the inner wall surface of the square steel pipe column and is welded by performing slot welding from the welding pilot hole of the square steel pipe column to the attached plate.
In the above, in the nut holding metal fitting, the size on the front surface side of the rectangular plate constituting the nut holding metal fitting is slightly larger than the shape of the seat, and the size on the back surface side is one size larger than the size on the front surface side. A seat restraint plate with a plurality of seat holes, which has an inclined cross section in terms of dimensions, and a rectangular plate having the same external dimensions as the seat restraint plate are cut out to be larger than the nut shape. In the nut restraint plate having a plurality of nut holes and the nut cover in which the thin plate is processed into a conical trapezoidal shape, the surface side of the seat restraint restraint plate and the nut restraint plate are overlapped and synthesized. The nut holding metal fitting is characterized in that a plate is formed and the bottom portion of the conical base of the nut cover is in contact with the periphery of the nut hole provided on the nut restraint plate surface of the synthetic plate.

(A)) According to the high-strength bolt fastening structure of the square steel pipe column according to the present invention, the present invention is a non-diaphragm type. Therefore, work such as cutting columns and attaching diaphragms in a general through-diaphragm type is unnecessary, processing costs, welding costs, welding management costs, etc. are reduced, and the process is shortened, resulting in a short delivery time. ..

(B) According to the high-strength bolt fastening structure of the square steel pipe column according to the present invention, the present invention is a non-bracket construction method for the square steel pipe column. Therefore, it is not necessary to manufacture the bracket, the processing is simplified, and the delivery time is short. Furthermore, since there are no protrusions on the pillars, the transportation efficiency to the construction site is high. It is also ideal for making skeletons for new types of wood hybrid buildings.

(C) According to the high-strength bolt fastening structure of the square steel pipe column according to the present invention, the high-strength bolt can be easily screwed into the nut from the outer surface side of the square steel pipe column and fastened. Furthermore, the movement of the nut and washer can be finely adjusted in all directions.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a drawing showing an example of a high-strength bolt fastening structure of a square steel pipe column according to the present invention, (a) is a vertical sectional view taken along the line AA, and FIG. 1B is a plan sectional view taken along the line BB. In this example, the square steel tube column 1, the attachment plate 2, the nut holding bracket 3, the washer restraint plate 3a, the nut restraint plate 3b, the nut cover 3c, the nut 4, the bolt 5, the washer 6, the washer hole 7, It is composed of a nut hole 8, a bolt through hole 9, a pilot hole 10 for slot welding, and a slot welding 11. Hereinafter, description will be made in line with this.

First, the square steel pipe column 1 will be described. As shown in FIGS. 1A and 1B, the square steel pipe column 1 is formed by abutting plate 2 holding the nut holding metal fitting 3 on all four sides of the inner wall surface of the square steel pipe column 1. Hereinafter, description will be made in line with this. As shown in FIG. 2, a bolt through hole 9 is provided on the outer surface side of the square steel pipe column 1 for joining with an H-shaped steel beam, and a bottom for slot welding is provided for connecting with a side plate 2. The hole 10 is machined. As shown in FIG. 3, the attachment plate 2 is formed by forming a bolt through hole 9 (not shown in the figure) on a plate processed into a rectangle having a predetermined size, and as shown in FIG. 1, a nut 4 and a washer 6 are provided. The nut holding metal fitting 3 in which the above is set is fixed by welding.

Next, a method of joining the square steel pipe column 1 and the side plate 2 will be described. As shown in FIG. 4, the attached plate 2 is inserted into the square steel pipe column 1, and the bolt through hole 9 of the square steel pipe column 1 and the bolt hole 9 of the bolt through hole 9 of the attached plate 2 are aligned to form the square steel pipe column 1. Slot welding 11 is performed from the pilot hole 10 for slot welding to the attachment plate 2, and the attachment plate 2 is fixed to the square steel pipe column 1.

Subsequently, the nut holding metal fitting 3 will be described. As shown in FIG. 5, the nut holding metal fitting 3 is composed of a washer restraint plate 3a, a nut restraint plate 3b, and a nut cover 3c. Hereinafter, description will be made in line with this.
First, the washer restraint plate 3a will be described. As shown in FIG. 6 (c), the plate thickness of the washer restraint plate 3a is processed to a predetermined dimension in a rectangular shape as shown in FIG. 5 by using a plate thicker than the washer 6. As shown in (c), a washer hole 7 in an inclined cross section is machined on the nut side of the plate 3a with a dimension slightly larger than the washer 6 shape and on the opposite side surface with a dimension slightly larger than the dimension on the nut side. ing.
Next, the nut restraint plate 3b will be described. The external dimensions of the nut restraint plate 3b are processed into the same rectangular dimensions as the washer restraint plate 3a, and the thickness of the nut restraint plate 3b is increased. As shown in FIG. 6C, a nut hole 8 having a size slightly larger than the shape of the nut 4 is machined using a plate thickness thicker than the washer restraint plate 3a.
Next, as shown in FIG. 6C, which describes the nut cover 3c, the nut cover 3c is formed by processing a thin plate into a truncated cone shape.

Next, the joining structure of each of the above-mentioned parts will be described. As shown in FIG. 5B, a synthetic plate is manufactured in which the nut side surface of the washer restraint plate 3a and the nut restraint plate 3b are superposed and welded at the joint. Next, the bottom portion of the nut cover 3c is fixed by welding to the peripheral surface of the nut hole 8 on the nut restraint plate 3b side of the synthetic plate to form the nut holding metal fitting 3.

An example of the high-strength bolt fastening structure procedure using the nut holding metal fitting 3 described above will be described. FIG. 6 shows the usage states of the nut holding metal fittings 3 in sequence.
Normally, as shown in FIG. 6A, the nut 4 and the washer 6 stored in the nut holding metal fitting 3 are held in contact with the bottom of each plate hole (8, 7). Hereinafter, examples of embodiments will be described based on the drawings.
First, when the bolt 5 is inserted through the bolt through hole 9 on the outer surface side of the square steel pipe column 1 containing the nut holding metal fitting 3, the chamfered tip (flat tip) of the inserted bolt 5 hits the washer 6. As shown in FIG. 6B, the nut 4 and the washer 6 are pushed out diagonally upward along the taper, and when the bolt 5 continues to be pushed, the nut 4 is pushed out of the nut cover 3c. It is guided to the bolt core at a predetermined position along the taper and screwed into the bolt 5.
Next, as shown in FIG. 6B, by providing a slight gap between the nut 4 and the nut hole 8 of the nut restraint plate 3b, when the bolt 5 rotates, the nut 4 has a nut hole. Since the movement in the (hexagonal type) 8 is restricted, the nut 4 does not rotate together with the bolt 5, and the nut 4 is on the bolt head side while contacting 3b along the thread of the bolt 5. The structure is such that the bolt tension (axial force) is obtained as the bolt moves to and the rotation from the head of the bolt 5 is strengthened.
Therefore, when there is rotation from the bolt 5, as shown in FIG. 6B, the washer 6 held on the nut 4 side of the washer restraint plate 3a is a washer due to the rotation and pressure from the nut 4. 6 starts moving to the inner wall, and as shown in FIG. 6C, the bolt 5, the washer 6 and the nut 4 are all integrated to obtain a state.
Further, as shown in FIG. 6 (c), the nut hole 8 is machined into a shape one size larger than the nut 4, and the washer hole 7 is also machined into an inclined cross section, so that the space is vertical, horizontal, etc. Therefore, the nut 4 and the washer 6 can be moved in a minute range in all directions (up, down, left, and right).

As described above, if a non-diaphragm type high-strength bolt fastening structure is adopted in the high-strength bolt fastening structure of a square steel pipe column in consideration of welding workability, machining is simplified without using difficult welding technology. Will be transformed. Further, the bolt head tightening method is a construction method for preventing the nut from rotating together, and is also a device that can move a minute range in all directions of the nut and the washer. In addition, by using a long square steel pipe for the frame of a wood hybrid refractory building currently under development, rational design is possible and economical. Therefore, the utility to society in the construction industry is extremely large.

There is a drawing showing an example of a high-strength bolt fastening structure according to the present invention, (a) is a vertical sectional view taken along the line AA, and (b) is a plan sectional view taken along the line BB. It is a three-dimensional explanatory drawing which shows the processing example of the square steel pipe column which concerns on this invention. It is a three-dimensional explanatory drawing which shows the manufacturing example of the attachment plate which concerns on this invention. It is explanatory drawing which shows the example of the process of inserting the attachment plate into the square steel pipe column which concerns on this invention. It is a drawing which shows the manufacturing example of the nut holding metal fitting which concerns on this invention, (a) is an elevation view, (b) is a sectional view. It is sectional drawing of the nut holding metal fitting 3 which concerns on this invention, and is explanatory drawing which shows the use state sequentially. It is a three-dimensional explanatory view which shows the square steel pipe column of the through diaphragm type in the conventional bracket construction method.

1 Square steel pipe column
2 Attachment plate 3 Nut holding bracket 3a Washer restraint plate 3b Nut restraint plate 3c Nut cover 4 Nut 5 Bolt 6 Washer 7 Washer hole
8 Nut hole 9 Bolt through hole
Pilot hole for 10-slot welding
11 Slot welding 12 H-shaped steel beam 12a Above through diaphragm 12b Below through diaphragm

Claims (2)

Multiple bolt penetrations in a square steel pipe column having a plurality of bolt holes matching the bolt holes on the beam end face and a plurality of pilot holes for welding at a location where bolts are joined to the end of the H-shaped steel beam. A support plate formed by providing a nut holding metal fitting for restraining a nut on a rectangular plate having a hole is brought into contact with the inner wall surface of the square steel pipe column, and a pilot hole for welding is provided in the square steel pipe column. A high-strength bolt fastening structure for a square steel pipe column, which is characterized by being welded by slot welding to the attached plate. In the nut holding metal fitting, the front side of the rectangular plate constituting the nut holding metal fitting has a size slightly larger than the shape of the seat, and the back side has a size slightly larger than the size of the front side. A seat restraint plate with a plurality of seat holes and a rectangular plate having the same external dimensions as the seat restraint plate, which have an inclined cross section, are cut out to be larger than the nut shape. In a nut restraint plate having a plurality of nut holes and a nut cover in which a thin plate is processed into a conical trapezoidal shape, the surface side of the seat restraint restraint plate and the nut restraint plate are overlapped with each other to form a synthetic plate. The square steel tube column according to claim 1, wherein the nut holding metal fitting is formed, and the bottom portion of the conical base of the nut cover is in contact with the periphery of the nut hole provided on the nut restraint plate surface of the synthetic plate. High-strength bolt fastening structure.

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