JP5597941B2 - Mating type steel column joint - Google Patents

Description

  The present invention relates to the joining of steel columns, and more particularly, to a joint portion of a fitting type steel column having a male insertion fitting and a female receiving fitting.

The steel structure is assembled by joining a shape steel such as an H-shaped steel, and a steel material such as a square steel pipe and a round steel pipe as members such as columns, beams, and braces.
In the construction of a steel structure, members that have been manufactured in the factory in a size that can be transported are brought into the construction site, and they are joined and assembled on site. In this case, for joining members and the like, welding joints are usually used at the factory, and bolt joining, which is a labor-saving construction method that does not require fire or special techniques at the site, is usually used.

  In the case of bolt joining, as shown in FIG. 9, a hole for penetrating the bolt is formed in the H-shaped steel column member 26 to be joined in advance, a steel splicing plate 20 having a bolt insertion hole is attached, and the bolt 21 A method of friction bonding by tightening is used. The bolts are tightened by using a torque wrench with a worker approaching the joint using a scaffold or the like.

  In addition, in the field of temporary structures, there is a tendency for the speed of assembly and dismantling to be required, compared to the main building, that the period of use of the members is short, and that the burden on the components is small. Since the structure is formed of a steel pipe, a drawn portion having an outer diameter smaller than the inner diameter of the other steel pipe is inserted (fitted) into one end of the two steel pipes to be joined. ) Is used to increase the speed of assembling and disassembling, and reuse the members after use.

Moreover, as shown in FIG. 11, in the power transmission line supporting column, a thin steel plate is used as a material, and a plurality of short steel pipe column members b whose diameters are gradually reduced upward in the longitudinal direction of the member are fitted to each other. A construction method (Panzamast (registered trademark) ) that constitutes a pillar is disclosed (for example, see Patent Document 1). In this construction method, it is easy to disassemble the long column into the short steel pipe column member b when removing or moving the column, and the short steel tube column member b can be reused.

Japanese Examined Patent Publication No. 29-8262

  In the case of joining with conventional bolts, an operator approaches the joint and performs a tightening operation for each bolt using a torque wrench. Therefore, when the cross section of the member to be joined is large, the number of bolts is large. Therefore, there is a problem that the time required for joining becomes long and the construction period becomes long.

  In addition, when used in a structure that is premised on the dismantling of a temporary structure or the like, for example, there is a method of disassembling the structure by removing the bolt of the joint or gas cutting of the member. When removing, it is necessary for the worker to approach the joint and to perform the work of removing the bolt using a tool, and the speed of disassembly is reduced. When disassembling is performed by gas cutting, the disassembling speed is increased, but the member is cut short, so that it is impossible to reuse the same structure again.

In the case of steel pipe fitting, it is limited to the case where the load transmission performance required for the joint is insignificant and the member to be joined is a steel pipe. In order to suppress rattling after fitting as much as possible, It is necessary to make the difference between the outer diameter and the inner diameter of the steel pipe end as small as possible. However, the smaller this difference is, the smaller the clearance between the members to be fitted becomes, and the workability during fitting becomes worse. .
When the tapered steel pipe member b is used, since the steel pipe column member b constituting the long column is manufactured using a thin steel plate, there is a problem that resistance performance when a bending moment is generated in the column is weak. . In this case, the shape of the column is limited to the steel pipe, and there is a restriction that the column itself has a tapered inclination.
The present invention is a fitting type that satisfies both the work performance at the time of joining and the strength of the joined part in the joint part of the column of the steel structure structure, thereby reducing the work of assembling and dismantling, and the assembly work. The main object of the present invention is to provide a steel column joint structure that can increase the speed and speed of the dismantling work and that advantageously solves the above-mentioned problems.
It is another object of the present invention to provide a joint structure that enables reuse of a steel column member when, for example, the same structure is constructed again without damaging the steel column member due to gas cutting or mechanical cutting.

The gist of the present invention is as follows.
In the 1st invention, in the junction part of the steel column of the temporary structure on the assumption of the dismantling which fits a female type metal fitting and a male type metal fitting,
The female receiving bracket has a tapered recess that gradually increases in width toward the tip, and the male insertion bracket has a tapered protrusion that gradually decreases in width toward the tip. Have
The inclination angle with respect to the column axis of the tapered portion of the female bracket is the same as the inclination angle with respect to the column axis of the taper portion of the male insertion fitting, and the inclination angle is 2.5 ° or more, 20 degrees or less,
The axial length of the steel columns that male insertion fitting and the female pivot bracket are in contact, 2/3 times or more the width of the steel column state, and are more than twice,
The female pivot bracket includes two inclined plates, is composed of a two side plates, and the closing plate of steel columns member, characterized in Rukoto.
In 2nd invention, when the said male type insertion metal fitting fits into the said female type metal fitting, it is good also as a structure where the face plate in the said male type metal insertion metal fitting does not contact the obstruction board in the said female type metal fitting.
As in the third aspect, in the above case, the surface of the taper portion of the female bracket or the surface of the taper portion of the male insertion fitting may be roughened.

According to the present invention having the above-described configuration, by joining the male insertion fitting to the female receiving fitting, the joining between the steel columns is completed, and the joining is completed more easily than the conventional joining method. can do. In addition, the speed of the assembly work and the speed of the dismantling work can be increased, and the steel column member can be reused.
Further, the tapered portions of the steel columns joined when the fitting is completed are in close contact with each other, and there is no backlash, so that resistance to bending moment can be exhibited.
In addition, when the surface of the tapered portion is rough, the maximum frictional force between the two surfaces that are in close contact with each other increases and the bonding becomes stronger.

It is a front view which shows the example of the application position of the fitting junction part in a steel structure. It is a figure which shows the joining procedure of the steel column in the case of fitting joining, (a) is the separated state, (b) is a front view which shows the fitted state. It is the expanded vertical front view which shows the junction part state at the time of a fitting. It is a figure for demonstrating a female type metal fitting, (a) is a side view, (b) is a front view, (c) is a bottom view. It is a figure for demonstrating a male type insertion metal fitting, (a) is a side view, (b) is a front view, (c) is a bottom view. It is a figure which shows the example in case a steel frame column is H-section steel, (a) is a front view, (b) is a side view. It is a figure which shows the example in case a steel frame column is a square steel pipe, (a) is a front view, (b) is a side view, (c) is sectional drawing of a steel column member. It is a figure which shows the result of a structural experiment. It is a front view which shows the conventional bolt joining. It is a figure which shows the condition of the intensity test of an Example, (a) is a front view, (b) is aa sectional drawing of (a). It is a perspective view which shows a panza mast construction method.

    Next, the present invention will be described in detail based on the illustrated embodiment.

As one form of the steel structure, there is a portal frame 26 composed of a steel column 22 and a steel truss beam 23 as shown in FIG. The gate-shaped frame 26 is assembled by assembling a steel frame processed at a steel processing factory to a construction site.
The position (joint position) where the steel column 22 is joined is determined in consideration of the length limitation during transportation, the construction method, the stress generated in the frame, and the like. FIG. 1 shows, as one form, joints composed of female receptacles 1a and male insertion fittings 2a at two joints in the middle of the two steel columns 22 of the portal frame 26, for a total of four places. An example is shown.

The fitting joint according to one embodiment of the present invention is a steel processing factory or construction site, in which a female-type metal fitting and a male-type insertion metal fitting 2a are preliminarily attached to a steel column member by welding joint. Do.
As shown in FIG. 2, the assembling procedure is such that the lower steel column 23 to which the male insertion fitting 2a having the insertion convex portion is attached is directed upward with the end on the male insertion fitting 2a side facing up. , And fix the other to the foundation 25. Then, the upper steel column 24 to which the female receiving bracket 1a having the tapered recess 29 for fitting the male insertion fitting 2a is attached is turned downward with the end on the female receiving bracket 1a side facing down. Etc., it moves to just above the lower steel column 23 to fit the male insertion fitting 2a. The steel column 24 to which the female receiving bracket 1a is attached may be on the lower side, and the steel column 23 to which the male insertion fitting 2a is attached may be on the upper side.

With reference to FIG. 4, the detail of the female type metal fitting 1a is demonstrated.
The female-type metal fitting 1a is composed of five pieces of an inclined plate 1, an inclined plate 2, a side plate 3, a side plate 4, and a closing plate 5 on the steel column member side, and the steel plates are welded to each other. The steel plate is cut off only on one side of the insertion port 6 for the male insertion fitting with respect to the hexahedron.

More specifically, one end side (bottom side) of the trapezoidal side plates 3 and 4 arranged so as to face each other in parallel is separated from each other, and the other end side (upper side) is mutually connected. The rectangular inclined plates 1 and 2 are arranged at the same level at the edge in the width direction of the side plates 3 and 4 and are fixed by welding W. Further, a closing plate 5 on the steel column member side is provided between the side plates 3 and 4 and the inclined plates 1 and 2 so as to close the upper sides of the side plates 3 and 4 and the upper sides of the inclined plates 1 and 2. It arrange | positions above and is being fixed to the said inclined plates 1 and 2 and each side plate 3 and 4 by welding. The welding W is performed by welding from the outside of the female bracket 1a so that no weld bead is generated on the inner surface of the female bracket 1a.
A concave portion 29 is formed by the inner space surrounded by the inclined plates 1 and 2, the side plates 3 and 4, and the closing plate 5, and the inclined plates 1 and 2 are inclined so as to be tapered. A concave portion 29 is formed.

Moreover, the male insertion metal fitting insertion port 6 plays the role of the insertion port of the male insertion metal fitting 2a. In addition, each of the inclined plates 1 and 2 which are surfaces that resist the bending moment in the strong axis direction, with respect to the material axis (column axis) Y in the longitudinal direction of the steel column, the insertion port 6 side (tip side) gradually increases from each other. It is an inclined surface (inclination angle θ) inclined at an inclination angle θ so as to be separated.
The base ends of the inclined plates 1 and 2 are fixed to the flange 27 of the H-shaped steel column member 1b by welding W, and the closing plate 5 is welded to the web 28 of the H-shaped steel column member 1b. It is fixed by. The inner space between the side plates 3 and 4 is slightly larger than the width of the flange 27 in the H-section steel column member 1b.
The base end side interval between the inclined plates 1 and 2 (corresponding to the length dimension between the inclined plates 1 and 2 of the closing plate 5) is the inclined plate 8 and inclined plate 9 in the male insertion fitting 2a described later. The face plates 13 and 16 of the male insertion fitting 2a are prevented from coming into contact with the closing plate 5 and the male receiving fitting 1a is male. In order to accommodate the entire mold insertion fitting 2a, the dimension in the column axis direction in the female receptacle 1a is made longer than the dimension in the column axis direction of the female receptacle 1a, so that the entire female receptacle 1a is male. The mold insertion fitting 2a is securely fitted.
Note that the side plates 3 and 4 resist the bending moment in the weak axis direction.

Next, details of the male insertion fitting 2a will be described with reference to FIG.
The male insertion fitting 2a includes an inclined plate 8, an inclined plate 9, a web portion plate 10, a steel plate member-side face plate 11, a rib reinforcing member 12, a tip plate 13, a steel column member-side face plate 14, and a rib reinforcing member 15. By assembling the steel plate of the tip plate 16 and welding the steel plates to each other, a male insertion fitting having a tapered convex portion 30 is obtained.

  More specifically, on the front and back sides of the upper end portion of the trapezoidal web part plate 10 that is arranged so as to be positioned at the center in the width direction and is symmetrically inclined, The front end plates 13 and 16 are arranged and fixed by welding W. In parallel with the front end plates 13 and 16, rectangular reinforcing members 12 and 15 having a length substantially the same as the width of the intermediate portion of the web portion plate 10 are fixed to the web portion plate 10 by welding W. ing. Similarly, rectangular face plates 11 and 14 are arranged in parallel to the reinforcing members 12 and 15 and fixed to the web portion plate 10 by welding W.

The front end plates 13 and 16, the reinforcing members 12 and 15, and the face plates 11 and 14 have the same width.
The width dimension of the rectangular inclined plates 8 and 9 is a dimension obtained by adding the thickness of the web part plate 10 to the width dimension of each of the leading end plates 13 and 16, and the inclined plates 8 and 9 are provided at the respective leading ends. The plates 13 and 16, the reinforcing members 12 and 15, the face plates 13 and 16, and the web part plate 10 are brought into contact with the inclined end surface and fixed by welding.

The welded portion in the male insertion fitting 2a is performed by welding W mainly from the inner side of the male insertion fitting 2a except for the welds W of the end plates 13 and 16, and on the outer surface of the male insertion fitting 2a. No weld bead is generated.
The base end side of each of the inclined plates 8 and 9 is fixed to the flange 27 of the H-shaped steel column member 1c by welding W, and the face plates 11 and 14 and the web plate 10 are H-shaped steel column members 1c in cross section. The web 28 is fixed by welding W.

  In the above-described embodiment, the tapered plate 30 is formed by the inclined plates 8 and 9 and the tip plates 13 and 16. When the front end plates 13 and 16 are fixed to the end surface on the front end side of the thickness of the web part plate 10, it is possible to replace the front end plates 13 and 16 with a front end plate made of a single steel plate. It is. The reinforcing material 12 may be a vertical reinforcing material, or may be a cross-shaped reinforcing material having both a vertical direction and a horizontal direction.

The width dimension of each of the inclined plates 8 and 9 is slightly smaller than the dimension between the side plates 3 and 4, so that the male insertion fitting 2a can be fitted to the female receptacle 1a. Yes.
Note that the end portions of the face plates 11, 14, the reinforcing members 12, 15, and the face plates 13, 16 resist the bending moment in the weak axis direction.
Further, the inclined plate 8 and the inclined plate 9 which are surfaces that resist the bending moment in the strong axis direction Y are inclined surfaces (inclination angle θ) inclined with respect to the material axis (column axis) Y in the steel column longitudinal direction. The web part plate 10 is installed at the position where it hits the H-shaped steel web as described above.
The base end portions of the inclined plates 9 and 10 are fixed to the flange 27 of the steel column member 1c having an H-shaped cross section by welding, and the inclined plates 8 and 9 are arranged in the center in the width direction. The upper plate 11 and 14, the reinforcing members 12 and 15, and the tip plates 13 and 16 are welded at a right angle with respect to the web plate 10 as a boundary. It is fixed by W.
In the present invention, the cross-sectional shape of the steel column to be joined may be an appropriate shape, and is not limited. FIG. 6 shows an embodiment in which the steel column is an H-shaped steel, and FIG. 7 shows an embodiment in the case of a square steel pipe.
When the steel column members 1b and 1c are square steel pipes, in the steel column member 1b, two of the four sides of the square steel pipe are fixed to the inclined plates 1 and 2 by welding W, etc. Are fixed to the closing plate 5 by welding.

The steel sheet constituting the joint is set to have a thickness so as not to yield and buckle against a bending moment of a predetermined level or more applied to the joint.
The inclination angle θ of the inclined surfaces of the male insertion fitting 2a and the female reception fitting 1a with respect to the material axis in the longitudinal direction of the steel column is the same, and when joining is completed, as shown in FIG. 3, the inclined plate of the female reception fitting 1a The male insertion fitting 2a and the female receptacle 1a so that the inner surfaces of 1 and 2 and the outer surfaces of the inclined plates 8 and 9 of the male insertion fitting 2a are in close contact with each other in surface contact. Set the dimensions of each part.

When the inclination angle θ and the dimensions of each inclined plate are set in this way, the inner side surfaces of the inclined plates 1 and 2 of the female receiving bracket 1a and the outer surfaces of the inclined plates 8 and 9 of the male insertion fitting are guided by each other. It can be guided as a surface and can be fitted, and when the fitting is completed, the material axes Y of the two steel frame columns 1b, 1c (2b, 2c) joined together are matched.
Further, the length L1 (see FIG. 4) of the female-type metal fitting 1a in the axial direction of the steel column member has a margin with respect to the length L2 (see FIG. 5) of the male-type insertion fitting 2a in the steel column material axis direction. It is preferable to provide an allowance for manufacturing error of the female receiving metal fitting 1a or the male insertion fitting 2a when the fitting is completed.
The inner side surfaces of the inclined plates 1 and 2 in the female-type metal fitting 1a that are brought into close contact with each other when the fitting is completed, and the outer surfaces of the inclined plates 8 and 9 in the male insertion metal fitting 2a are subjected to blasting such as sandblasting or shot blasting. When the surface treatment for increasing the roughness value of the taper portion surface is performed to make the surface rough, the maximum frictional force between the two surfaces that are in close contact with each other increases, and the bonding becomes stronger.
In this way, by configuring the female receiving bracket 1a and the male insertion fitting 2a, the clearance between the distal end of the female receiving fitting 1a and the distal end of the male insertion fitting 2a at the time of steel column fitting is reduced. It can be ensured, and when the fitting is completed, the steel columns can be brought into close contact with each other, and a predetermined load or more can be transmitted at the joint.
In addition, when disassembling the joined column members, the steel column member 1b positioned above the joint portion can be easily removed by a heavy machine, and there is no damage like conventional gas cutting. When the same structure is constructed again, the same steel column members 1b and 1c can be reused.

The Example of the joining structure of the steel column in this invention is shown.
In FIG. 10, in the joint structure of the present invention, the load transmission performance of the joint portion and the insertion length L in the axial direction of the steel column 17 where the male insertion fitting 2a and the female receptacle fitting 1a of the joining portion contact each other, And the implementation status of the test to confirm the relationship between the taper-shaped inclination angle θ is shown.
The test body is composed of a steel column member 17 made of H-shaped steel and the joint portion 18 of the present invention fixed to the H-shaped steel. Two fulcrums 19 and the joint 18 of the present invention are provided in the center between the fulcrums 19.
Loading is concentrated at points at two locations equidistant from the center of the specimen. By this loading method, a bending moment can be generated in the joint 18 of the present invention.
The steel column H-shaped steel size in the test specimen is 294 mm for the strong axis width H, 200 mm for the weak axis width B, 8 mm for the web plate thickness tW, and 12 mm for the flange plate thickness tf.

As a result of the test, the insertion length L of the steel column in which the male insertion fitting 2a and the female receiving fitting 1a in FIG. 10 are in contact with each other is 2/3 times or more the strong axis width H of the steel column, And if the taper-shaped inclination | tilt angle (theta) is 20 degrees or less, even if it loads the bending moment in which the steel column H-section steel yields, the joint part of this invention is the male insertion metal fitting 2a and the female type metal fitting 1a. It was possible to transmit the bending moment without separation.
On the other hand, when the insertion length L is less than 2/3 times the strong axis width H of the steel column or the inclination angle θ is greater than 20 °, the bending moment at which the steel column H-section steel yields is obtained. As a result, the male insertion fitting 2a and the female receiving fitting 1a were detached with a small bending moment.
As for the relationship between the tapered inclination angle θ and the ease of fitting, the larger the inclination angle θ, the larger the clearance at the time of fitting, and the fitting of the male insertion fitting 2a and the female receiving fitting 1a becomes easier. However, when the inclination angle θ is 2.5 ° or more, the fitting can be performed smoothly, and when it is less than 2.5 °, the fitting is extremely difficult.
Increasing the insertion length L in the material axis direction naturally increases the amount of steel used and increases the manufacturing cost. When the insertion length L is longer than twice the steel column strong axis width H, the amount of steel for producing the joint of the present invention is 5 times the amount of steel required for conventional bolted joints. Therefore, it can be said that the cost is not reasonable.
A summary of the results of the above implementation is shown in FIG. The taper-shaped inclination angle θ and the magnification with respect to the strong axis width H of the steel column with the insertion length L in the axial direction of the steel column in contact with the male insertion fitting 2a and the female receiving fitting 1a are load transferability, construction Considering the characteristics and cost, it is better to narrow the range to X.

  In carrying out the present invention, in the above-described embodiment, the two opposing surfaces of the female receiving bracket 1a and the male insertion fitting 2a are inclined surfaces, but the other two opposing surfaces (the female receiving bracket 1a or Regarding the male insertion fitting 2a), it is also possible to make the four surfaces of the peripheral side portions of the female receptacle 1a and the male insertion fitting 2a as inclined surfaces so as to be inclined.

DESCRIPTION OF SYMBOLS 1a Female type receiving metal fitting 2a Male type insertion metal fitting 1b H-shaped steel frame column member 2b joined to a female type metal fitting 1b Square steel pipe steel column member 1c joined to a female type metal fitting H type steel to be joined to a male type insertion metal fitting Steel column member 2c Square steel tube steel column member b to be joined to male insertion bracket Steel tube column member L1 which constitutes a long column in the panther mast Material axis direction length L2 of female type reception bracket Material axis direction of male insertion bracket Length B1 Material axis perpendicular direction width B2 of female type receiving bracket B2 Material axis perpendicular direction width θ of male insertion bracket Inclined part angle H Strong axis width of H-shaped steel bone column in actual test B H-shaped steel bone in actual test Weak axial width of column tf Flange thickness tw of H-shaped steel bone column in the test test Web thickness L of H-shaped steel frame column in the test test Mating joint insertion length 1 in the test test Tilt plate 2 of the female receiving bracket Inclined plate of female receiving bracket 3 Female receiving Side plate 4 of the female side plate 5 Side plate of the female type receiving metal plate 6 Side plate 6 of the female type receiving metal fitting 6 Male insertion fitting insertion port 7 in the female receiving fitting 7 Inclined plate 8 of the male insertion fitting Male insertion fitting Inclined plate 9 Inclined plate of male insertion fitting 10 Web part plate of male insertion fitting 11 Face plate 12 on the side of the steel column member of the male insertion fitting Male insertion fitting rib reinforcement 13 Male insertion fitting End plate 14 Steel plate member side face plate 15 in male insertion fittings Rib reinforcement 16 of male insertion fittings Tip plate 17 of male insertion fittings H-shaped steel column member 18 in an implementation test The present invention in an implementation test Joint part 19 fulcrum 20 of test specimen in execution test bolt 21 in bolt joint bolt 22 in bolt joint steel column 23 in portal frame 23 beam 24 steel column 25 foundation 26 portal frame 27 flange 28 web 2 9 Tapered concave part 30 Tapered convex part

Claims (3)

In the joint of the steel column of the temporary structure assuming the disassembly to fit the female receiving bracket and the male insertion bracket,
The female receiving bracket has a tapered recess that gradually increases in width toward the tip, and the male insertion bracket has a tapered protrusion that gradually decreases in width toward the tip. Have
The inclination angle with respect to the column axis of the tapered portion of the female bracket is the same as the inclination angle with respect to the column axis of the taper portion of the male insertion fitting, and the inclination angle is 2.5 ° or more, 20 degrees or less,
The axial length of the steel columns that male insertion fitting and the female pivot bracket are in contact, 2/3 times or more the width of the steel column state, and are more than twice,
The female pivot bracket includes two inclined plates, and two side plates, the junction of the steel columns that wherein Rukoto is composed of a closing plate of steel columns member.   2. The structure according to claim 1, wherein when the male insertion fitting is fitted to the female reception fitting, the face plate of the male insertion fitting does not contact the closing plate of the female reception fitting. The steel column joint described.   3. The steel column joint according to claim 1, wherein the tapered surface of the female bracket or the tapered surface of the male insertion fitting is subjected to a rough surface treatment. .

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