TWI433982B - Reinforcement of steel pipe reinforcement and its manufacturing method - Google Patents

Description

Steel pipe reinforcing struts and manufacturing method thereof

The present invention relates to a steel pipe reinforcing struts and a method for producing the same, and more particularly to a steel pipe reinforcing struts provided on steel structures such as buildings and a method for manufacturing the same.

The steel pipe reinforcing struts provided in the steel structure are inserted into the diagonal line of the reinforcing steel pipe by the flat steel, and the compression force acts on the outer side of the shaft when the compression force acts on the outer side of the shaft (the direction perpendicular to the long direction) Qu, can increase the energy absorption capacity.

At this time, even if the inner surface of the shaft material and the reinforcing steel pipe are slid, in order to prevent the occurrence of friction sound or to reduce the friction, the backing plate is inserted into the gap between the two, or the steel structure is reliably disposed in the tube axis direction of the shaft material. The end portion is provided with a wide joint member (hereinafter referred to as "end member") which is wider than the diagonal length of the reinforcing steel pipe.

In addition, a method of manufacturing a struts (the same as the steel pipe reinforcing struts) which can easily insert the shims and improve the degree of freedom of the shape of the end members is disclosed (for example, see Patent Document 1).

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] JP-A-2001-132112 (pages 3-4, 2)

The method for producing a susceptor disclosed in Patent Document 1 is to bend a pair of steel sheets into a cross-sectional inverted shape or a cross-sectional shape (or an L-shaped type. The same applies hereinafter), and the surrounding members are arranged to surround the shaft member. And each side edge is welded to each other to form a cross-sectional rectangular reinforcing steel pipe.

Therefore, the configuration of the mat can be easily performed, and the precision of the gap can be improved to enhance the reinforcing effect. Further, the shape of the end member can be selected without being affected by the size of the reinforcing steel pipe but having the following problems.

(a) The reinforcing steel pipe is long in size, and it is necessary to have a high-pressure machine having considerable capability in order to accurately bend the long flat steel. Therefore, restrictions on the device from manufacture can lead to limitations of the applicator.

(b) For the reinforced steel pipe formed by the bending of the flat steel, the radius of curvature of the outer corner portion of the reinforcing steel pipe opposite to the shaft material is required to be 10 times or more the thickness of the flat steel when the thickness of the flat steel is 6 mm or more, which is less than the plate. When it is 10 times thicker, it is necessary to obtain the identification of special materials (refer to the Japanese Building Standards Act "H12 Construction 2464 No. 1 No. 8"). Therefore, in order to suppress the out-of-plane buckling, it is necessary to obtain the identification of special materials.

Therefore, a method of manufacturing a reinforcing steel pipe that can surround the shaft material without bending is considered to be a method of assembling four flat steels into an angular shape (hereinafter referred to as "welding four-sided box"). However, when a welded four-sided box is used as the reinforcing steel pipe for reinforcing the steel pipe, there are the following problems.

(c) In the vicinity of the side edge of the main shaft material, the force applied from the inside to the reinforcing steel pipe is applied by the out-of-plane buckling of the main shaft material. Therefore, the welding of the corner portion of the steel pipe is not welded to the inner side of the plate thickness. When the part is welded, it will reduce the reinforcing effect and form the starting point of the fracture of the steel pipe.

(d) When welding the corners of the steel pipe using a full thickness weld with a full thickness of the welded plate, it is necessary to provide a lining ring on the inside of the steel pipe (the inner side of the steel pipe), and it will be in contact with the shaft or the backing plate. Proper clearance.

The present invention has been made in order to solve the above problems, and provides a method for manufacturing a struts which do not require bending of a flat steel, can prevent breakage of a steel pipe, and can form a reinforcing steel pipe which secures an appropriate gap, and a manufacturing method thereof The struts are made for the purpose.

(1) A steel pipe reinforcing struts according to the present invention, comprising: a main shaft material formed of flat steel; and a reinforcing steel pipe for surrounding the outer surface deformation of the main shaft material surrounding the main shaft material, wherein the reinforcing steel pipe is 4 The side edges of the flat steel of the sheet are butted together, and the outer corner portion is formed by partial penetration welding, and the inner corner portion of the steel pipe opposite to the side edge of the main shaft material is formed by fillet welding, and is formed into a rectangular cross section.

(2) In the above (1), the backing is disposed in a gap between the inner corner portion of the reinforcing steel pipe after the fillet welding and the side edge of the main shaft member.

(3) In the above (1) or (2), the side surface of the main shaft member is provided with a sub-shaft member formed of flat steel.

(4) In any one of the above (1) to (3), the end portion of the spindle shaft in the axial direction is provided with a flat end made of a flat steel having a length wider than a diagonal line of the reinforcing steel pipe. member.

(5) A method for producing a steel pipe reinforcing struts according to the present invention, comprising: a main shaft material formed of flat steel; and a reinforcing steel pipe for surrounding the outer surface deformation of the main shaft material surrounding the main shaft material, characterized in that: The side edges of the flat steel are butt jointed, and the inner corner joint of the fillet weld is used for final welding, and the outer corner portion is intermittently welded in the axial direction by partial penetration welding to form a cross-sectional U-shaped reinforcing member; In a state in which the side edge of the main shaft member is opposed to the inner corner portion after the final welding of the reinforcing member, the side edges of the pair of reinforcing members are butted, and the outer corner portion is intermittently in the axial direction by partial penetration welding. Temporary welding, a step of temporarily assembling a rectangular reinforcing steel pipe; and a step of finally assembling the reinforcing steel pipe by partially welding the above-mentioned reinforcing steel pipe after the temporary welding of the outer side corner portion.

(6) Further, in the step of finally assembling the reinforcing steel pipe of the above (5), it is characterized in that the final welding of the outer corner portions of the outer side corner portions after the temporary welding of the reinforcing steel pipe is performed at the same time.

(7) Further, in the above (5) or (6), the step of temporarily assembling the reinforcing steel pipe has a gap between the inner corner portion and the side edge of the main shaft after the final welding of the reinforcing member, The steps to configure the pad.

(8) In any one of the above (5) to (7), the side surface of the main shaft member is provided with a sub-shaft member formed of flat steel.

(9) In any one of the above (5) to (8), the end portion of the spindle shaft in the axial direction is provided with a flat end made of a flat steel having a length wider than a diagonal line of the reinforcing steel pipe. member.

(I) The steel pipe reinforcing struts according to the present invention are obtained by butting four side edges of the flat steel, forming a lateral corner portion by partial penetration welding, and forming a steel pipe inner side opposite to the side edge of the main shaft material by fillet welding. The corner portion is formed into a rectangular cross section, and it is not necessary to perform bending processing of the flat steel, and the outer surface buckling of the main shaft material can generate a pressing force from the inner side of the steel pipe to prevent cracking of the reinforcing steel pipe.

Further, although the fillet weld is not performed on the inner corner corner portion of the inner corner portion of the steel pipe which is opposed to the side edge of the main shaft member, the stress does not occur in the latter, so that the reinforcing steel pipe does not break.

Further, it is not necessary to provide a liner ring on the inner corner surface of the steel pipe facing the side edge of the main shaft material, and an appropriate gap can be secured between the reinforcing steel pipe and the shaft material or the backing plate.

(II) Further, a backing plate is disposed in the gap between the inner corner portion of the reinforcing steel pipe and the side edge of the main shaft material, so that the out-of-plane deformation (deflection) of the main shaft material can be correctly restrained, and the friction sound can be obtained even if both are slid. The occurrence of prevention and the reduction of friction.

(III) In addition, since the sub-shaft member made of the flat steel is provided on the side surface of the main shaft member, the out-of-plane deformation of the compressive force in the axial direction can be restricted, and the absorbed energy can be increased.

(IV) Further, an end member formed of a flat steel having a length longer than a diagonal line of the reinforcing steel pipe is provided at an end portion in the direction of the main shaft axis, so that the connection to the steel structure can be surely formed, so that the energy absorption of the main shaft material is achieved. More certain.

(V) In addition, the method for manufacturing a steel pipe reinforcing struts according to the present invention has the steps of: forming a final welding by filling the inner corner of the fillet, and temporarily welding the outer corner to form a reinforcing member by partial penetration welding; The step of temporarily welding the outer corners by means of partial penetration welding for the temporary assembly of the reinforcing steel pipes; and the step of finally welding the outer corners by partial penetration welding to complete the final assembly of the reinforcing steel pipes, so that the bending of the flat steel is not required And can prevent the bending or warping of the steel pipe due to welding heat to form a reinforcing steel pipe.

(VI) The semi-automatic welding machine arranged in a row performs the final assembly of the reinforcing steel pipe at the two outer corners of the outer corner after the temporary welding of the reinforcing steel pipe, thereby reducing the number of times the steel pipe is reinforced by the reinforcing struts during welding. , shorten the manufacturing steps.

(VII) In addition, the step of arranging the backing plate is provided before the temporary assembly of the reinforcing member, so that the configuration of the backing plate can be easily performed, and the precision can be improved and the reinforcing effect can be improved.

(VIII) A sub-shaft made of flat steel is provided on the side surface of the above-mentioned main shaft material, and the out-of-plane deformation of the compressive force in the axial direction can be restrained, and the absorbed energy can be increased.

(IX) Since the end member does not penetrate the inside of the reinforcing steel pipe at the time of manufacture, the size or shape of the end member is not affected by the size of the reinforcing steel pipe. Therefore, an end member made of a flat steel having a wider length than the diagonal of the reinforcing steel pipe can be provided, and the connection to the steel structure can be formed to make the energy absorption of the main shaft material more reliable.

[Embodiment 1]

Fig. 1 and Fig. 2 are views showing a steel pipe reinforcing struts according to a first embodiment of the present invention, and Fig. 1(a) is a top view, Fig. 1(b) is a side view, and Fig. 2(a) is a view. The cross-sectional view in the front view direction (the XX cross section in Fig. 1(b)), and Fig. 2(b) are the cross-sectional views in the front view in the enlarged view of the part (a) of Fig. 2 . Further, each drawing is shown by a mode, and the relative size, thickness, and the like of each member are not limited by the dimensions shown in the drawings. In addition, in the description of the common part, the description of the added character "a, b" of the symbol is omitted.

(Steel tube reinforcement struts)

In the first and second figures, the steel pipe reinforcing struts 100 have a shaft member 10; a reinforcing steel pipe 20 for surrounding the out-of-plane deformation of the main shaft member surrounding the shaft member 10; and fixed at both ends in the longitudinal direction of the shaft member 10, An end member (corresponding to the joint member) 30a and 30b for providing a steel structure (not shown), and a backing plate 40a, 40b disposed at a gap between the side edge of the shaft member 10 and the inner surface of the reinforcing steel pipe 20 .

(shaft material)

The shaft member 10 is formed of a main shaft member 11 made of flat steel having a shorter reinforcing steel pipe 20, and sub-shaft members 12 and 13 formed of flat steel fixed to both side faces of the main shaft member 11, respectively, in a cross-shaped cross shape. . At this time, the distance between the side edge of one of the sub-shaft members 12 and the side edge of the other sub-shaft member 13 (hereinafter referred to as "width B2") is smaller than the distance between the side edges of the main-shaft member 11 (hereinafter, referred to as "width" B1") (B2 < B1).

Furthermore, the present invention is not limited to the illustrated form of the shaft member 10, and only the main shaft member 11 to which the sub-shaft members 12 and 13 are not fixed may be used.

(reinforcing steel pipe)

The reinforcing steel pipe 20 is a tubular shape having a rectangular cross section longer than the shaft member 10, and the side edges of the four flat steels 21, 22, 23, and 24 are welded to each other.

That is, the side end surface of the flat steel 22 on the side of the flat steel 21 has a cross-sectional U-shape, and the inner corner portion (the abutting portion on the concave side) 25a is a fillet weld W1, and the outer corner portion (the abutment portion on the convex side) 25b is welded by a partial penetration weld W4 (partially through the weld W24 in the longitudinal direction).

Further, the inner corner portion 26a and the outer corner portion 26b in which the flat steel 23 and the flat steel 24 are butted are also subjected to fillet welding W1 and partial penetration welding W4 (partially penetrated and welded W24 in the longitudinal direction).

In addition, the side end surface of the flat steel 24 is butt-joined on the side of the flat steel 21, and the corner portion (the abutting portion on the convex side) 28b is a partial penetration weld W5 (partially melted in the long direction) Through welding W35) to weld the bond. At this time, the corner portion (the abutting portion on the concave side) is not subjected to fillet welding. Further, since the combination of the flat steel 23 and the flat steel 22 is also the same, the description is omitted.

Further, since the reinforcing steel pipe 20 is formed by the above welding form, it is less curved or warped, and there is no need for correction. (This will be described in detail in the second embodiment.)

(end member)

The end members 30a and 30b (hereinafter referred to as "end members 30") have a main end member 31 fixed to the longitudinal end portion of the main shaft member 11 and fixed to the longitudinal direction of the sub-shaft members 12 and 13. The secondary end members 32, 33 of the ends. The secondary end members 32, 33 are fixed to both side faces of the main end member 31 in a cross-shaped cross shape.

At this time, the main end member 31 and the sub-end member 32 are narrowed in the range of the reinforcing steel pipe 20 in the axial direction, and enter the inside of the reinforcing steel pipe 20. On the other hand, in the vicinity of the end portion in the axial direction from which the reinforcing steel pipe 20 protrudes, the distance between the side edges of the main end member 31 (hereinafter referred to as "width B3") and the side edge of the sub-end member 32 and the other sub-end end The distance of the side edge of the member 33 (hereinafter, referred to as "width B4") is sufficiently larger than the length of the diagonal line inside the reinforcing steel pipe 20.

In the above description, the main end member 31 and the sub-end members 32 and 33 are formed with the through holes 34 and the like which are provided in the bolts for the steel structure, but the present invention is not limited to the form of the drawings. For example, the end portions of the main end member 31 and the sub-end members 32 and 33 may be welded to the steel structure without providing the through holes 34 or the like. At this time, the steel structure is provided with a gusset having an end shape having the same shape as that of the end portions of the main end member 31 and the sub-end members 32, 33.

(pad)

The backing plate 40 is disposed in a gap between the side edge portion of the main shaft member 11 and the inner surface of the reinforcing steel pipe 20. When the main shaft member 11 is deformed (deflected) out of plane, the amount of deformation of the outer surface of the restraining surface is appropriately set, and the reinforcing effect can be improved. . Further, the side edge portion of the main shaft member 11 and the inner surface of the reinforcing steel pipe 20 are butted against each other through the backing plate 40, and the direct friction is prevented from being directly slid, and the occurrence of frictional noise and the reduction in friction can be obtained.

Further, the material for forming the backing plate is not limited to a specific material, and may be a hard synthetic resin, natural rubber or artificial rubber.

[Embodiment 2]

3 to 5 are views for explaining a method of manufacturing a steel pipe reinforcing struts according to a second embodiment of the present invention, wherein Fig. 3 is a flow chart showing each step, and Fig. 4(a) is a view showing the steps of the respective steps. In the view, (b) of Fig. 4 is a side view thereof, (c) of Fig. 4 is a cross-sectional view in the front view direction (XX section of (b) of Fig. 4), and Fig. 5 is a mode representation A cross-sectional view of the forward direction of each step. The same or equivalent portions as those in the first embodiment are denoted by the same reference numerals, and a part of the description will be omitted.

In the third and fourth figures, the manufacturing method of the reinforcing steel pipe struts has the sub-shafts 12 and 13 which are formed by flat steel on both side faces of the main shaft 11 formed of the flat steel, and which form a cross-shaped cross. The first step (S1) of the shaft member 10 and the second step (S2) of fixing the end members 30a and 30b of the cross-shaped cross-section are respectively fixed to both end portions of the shaft member 10.

At this time, after the auxiliary end members 32 and 33 are respectively fixed to the both end faces of the main end member 31 to form the end member 30 having the cross-sectional shape, the main end member 31 is fixed to the main shaft member 11, and the auxiliary end members 32 and 33 are fixed. The sub-shaft members 12 and 13 may be fixed to the main shaft member 11 by the main end member 31, and the sub-end members 32 and 33 may be fixed to the sub-shaft members 12 and 13 to form the end member 30 having a cross-sectional shape.

Further, the sub-end members 32, 33 and the sub-shaft members 12, 13 may be fixed to the joint of the main end member 31 and the main shaft member 11, that is, the first step and the second step may be simultaneously performed.

In FIGS. 3 and 5(a), reinforcing members 25 and 26 are formed next. That is, the end surface of the flat steel 22 is butted against the side surface of the flat steel 21 to form a cross-sectional U-shape, and the final welding of the inner corner portion 25a is performed by filling the fillet weld W1, and by partial penetration welding W2 The corner portion on the convex surface side (hereinafter referred to as "outer corner portion") 25b is intermittently welded in the axial direction to form a cross-sectional U-shaped reinforcing member 25, and the third step (S3) of the reinforcing member 26 is similarly formed. Hereinafter, there is a case where the abutting portion is referred to as a "spindle material corner portion".

At this time, the two side edges of the flat steel 22 are pre-applied with chamfering (C chamfering), so that the outer corner portion is formed with a bottom in the middle of the thickness of the flat steel 22. Type beveled (single-blade bevel). The reinforcing member 26 is also formed for the flat steels 23, 24.

In addition, the partial penetration weld W2 means that the penetration depth is shallower than the thickness of the flat steel 22, and the weld remaining in the welded portion is intermittently welded and penetrated in the longitudinal direction (longitudinal direction of the reinforcing steel pipe 20). For example, it refers to a ridge of 1 or a few layers each having a length of 50 mm at intervals of 1 m.

In the third and fifth aspects, (b), the fourth step (S4) of abutting the pads 40a and 40b on both side edges of the main shaft 11 of the shaft member 10 is provided.

In Fig. 3 and Fig. 5(c), the reinforcing steel pipe 20 surrounding the shaft member 10 is temporarily assembled. In other words, the both sides of the main shaft member 11 of the shaft member 10 are opposed to the inner corner portion of the reinforcing members 25 and 26 through the spacer 40, and the reinforcing members 25 and 26 surround the shaft member 10, so that the reinforcing member is strengthened. Component 25 and complement The side edges of the strong members 26 abut each other (correctly the side edges of the flat steel 22 and the flat steel 23, the side edges of the flat steel 24 and the flat steel 21), and the outer corner portions 27b, 28b are partially welded to each other. Temporary welding is intermittently performed in the axial direction to temporarily assemble the fifth step (S5) of the reinforcing steel pipe 20 having a rectangular cross section.

At this time, the inner corner portions 27a and 28a which form the abutting portions of the side edges of the reinforcing member 25 and the reinforcing member 26 (hereinafter referred to as "the sub-shaft corner portion") are not welded, and are partially penetrated. The welding W3 is based on the partial penetration welding W2, so that the penetration depth is shallower than the thickness of the flat steels 22 and 24, and the unwelded portion remains in the thickness direction, and is welded intermittently in the longitudinal direction. The welding from the outside does not penetrate the inner corner portions 27a, 28a.

In Fig. 3 and Fig. 5(d), the reinforcing steel pipe 20 is finally assembled. That is, the outer corner portions 25b and 26b and the outer corner portions 27b and 28b which are executed by the partial penetration welds W2 and W3 are finally welded by partial penetration welding W4 and W5, and finally the reinforcing steel pipe 20 is finally assembled. 6 steps (S6).

At this time, the partial penetration weld W2 is intermittently performed in the longitudinal direction at the outer corner portions 25b and 26b, and the partial penetration penetration of the partial penetration weld W4 on the partial penetration weld W2 can be partially performed. Solder W24.

Similarly, the partial penetration weld W3 is intermittently performed in the longitudinal direction at the outer corner portions 27b, 28b, and the partial penetration penetration of the partial penetration weld W5 through the partial penetration weld W3 can be partially performed. Solder W35.

As described above, the method for manufacturing the steel pipe reinforcing struts according to the present invention is such that the pair of reinforcing members 25 and 26 which temporarily weld the outer corner portions 25b and 26b surround the shaft member 10 in a state in which the end member 30 is fixed, and temporarily weld a pair of reinforcing members. After the outer corner portions 27b and 28b of the members 25 and 26 are temporarily assembled and the reinforcing steel pipe 20 is temporarily assembled, the final assembly is performed while maintaining the rectangular shape, and the bending process of the flat steel 21 or the like is not required, and the final welding can be suppressed. The reinforcing steel pipe 20 which is bent or warped by the flat steel 21 or the like due to the influence of the welding heat.

[Embodiment 3]

Fig. 6 is a view for explaining a method of manufacturing a steel pipe reinforcing struts according to a third embodiment of the present invention, and a schematic cross-sectional view showing a sixth step (S6) in a front view. The same or equivalent portions as those in the second embodiment are denoted by the same reference numerals, and a part of the description will be omitted.

In the third embodiment, the sixth step (S6) of the second embodiment is executed by a welding machine (semi-automatic welding machine) having two continuous welding torches. The welding machine 70 has a work frame 71, a work station 72, a work arm 73 movably provided on the work frame 72, welding torches 60a and 60b provided on the work arm 73, and a power supply means for supplying a predetermined current to the welding torches 60a and 60b. (including control means. Not shown); and means for supplying materials (not shown) for supplying welding materials (welding wire, inert gas, etc.) to the welding torches 60a, 60b.

In (a) of Fig. 6, the rotary reinforcing steel pipe 20 is formed on both sides. The beveled flat steel 24 (see (d) of Fig. 5) is horizontal and located on the upper side, and is placed on the work table 71.

And, the welding gun front ends 61a, 61b are arranged to be formed on both sides of the flat steel 24 The type of beveled (outer corners) 26b, 28b directly above.

Therefore, the working arm 73 is moved (the welding gun front ends 61a and 61b move in parallel with the axial direction of the reinforcing steel pipe 20), and at the same time, partial penetration welding of the outer corner portions 26b and 28b is performed.

Next, the reinforcing steel pipe 20 is reversely rotated by 180 degrees so that the flat steel 22 is horizontal and comes to the upper side, and the partial penetration welding of the outer corner portions 25b and 27b is simultaneously performed in the same order.

As described above, in the outer corner portion after the temporary welding, since the outer corner portion of the second welding is simultaneously welded to the final welding of the reinforcing steel pipe 20, it is possible to suppress the bending or warpage of the steel pipe due to the influence of the welding heat.

Furthermore, the welding sequence of the flat steel 24 and the flat steel 22 is the first one.

Further, the present invention is not limited to the type of the welding machine 70, and the work table 71 may be moved instead of the working arm 73. Alternatively, the welding guns 60a, 60b may be provided on the respective working arms.

In (b) of Fig. 6, on one side of the flat steel 21, one side of the flat steel 23, and on both sides of the flat steel 24 The type of beveling is such that the portion which is not chamfered in the flat steel 22 is based on (a) of Fig. 6, and the outer corner portions 25b, 26b, 27b, and 28b are formed at the respective corners.

Further, the rotating reinforcing steel pipe 20 has the outer corner portion 27b and the outer corner portion 28b horizontally positioned on the upper side and placed on the work table 71.

Therefore, the welding gun front ends 61a and 61b are provided directly above the outer corner portions 27b and 28b, and the working arm 73 is moved (the welding gun front ends 61a and 61b move in parallel with the axial direction of the reinforcing steel pipe 20), and the outer corner portion 27b is simultaneously Partial penetration penetration of 28b.

Next, the reinforcing steel pipe 20 is reversed at 180 degrees, and the outer corner portions 25b, 26b are placed horizontally and come to the upper surface, and then the partial penetration welding of the outer corner portions 25b, 26b is simultaneously performed in the same order.

Therefore, the same effects as the welding method shown in (a) of Fig. 6 can be obtained.

(Example)

Next, the steel pipe reinforcing struts according to the first embodiment are the same as those of the steel pipe reinforcing struts manufactured by the method for producing a steel pipe reinforcing struts according to the second embodiment, and the following is the case of "welding four-sided box type". In the embodiment, a pair of steel plates are bent into a cross-sectional U-shape, and the reinforcing steel pipe struts are formed by surrounding the shaft members and welding the respective end edges to each other to form a cross-sectional rectangular reinforcing steel pipe (hereinafter referred to as "ㄑ" The experiment of the performance of the comparative example of the font type "pressure type") is explained below.

Figure 7 is a view for explaining a test piece used in an experiment, (a) is a top view of the embodiment, (b) is a side view of the embodiment, and (c) is a cross-sectional view of the front view of the embodiment (No. 7) AA cross section (a) and (d) of the figure (a) are cross-sectional views of the comparative example in the front view direction.

In (a) to (c) of Fig. 7, the embodiment has a thickness of 9 mm with respect to the steel pipe, the inner fillet weld has a length of 3 mm, and the outer portion has a bevel angle of 45 degrees and a bevel depth of 7 mm.

In (d) of Fig. 7, the comparative example has the same cross-sectional shape, steel pipe diameter, and thickness as the embodiment, but the manufacturing method of the reinforcing steel pipe is different.

Table 1 shows the results of the respective examples and comparative examples and the results of carrying out the equal-width load test.

The "number of repetitions" in Table 1 is an index indicating the fatigue characteristics of the steel pipe reinforcing struts, and shows the number of repetitions until the endurance is reduced to 70% of the maximum endurance after the maximum endurance of the shaft material. In addition, the "accumulated plastic deformation ratio" in Table 1 is an index indicating the energy absorption capacity of the steel pipe reinforcing struts, and the inner area of the hysteresis curve (endurance-deformation curve) up to the above-mentioned number of repetitions is divided by "yield endurance × The value after the rectangular area of the yield deformation.

In Table 1, for the number of repetitions, one of the examples (welding four-sided box type) was more than the comparative example (ㄑ-type pressurized type).

In addition, in the case of the cumulative plastic deformation magnification, the number of the examples is lower than the value of the comparative example. However, when the two are compared with "300" which is the necessary cumulative plastic deformation magnification corresponding to the large earthquake, the value is sufficiently large. . Further, the difference between the two can be said to be within the range of the error. Therefore, the embodiment can be said to have sufficient performance as in the comparative example.

Further, in the example, after the endurance was less than 70% of the maximum endurance, no impaired endurance was observed, and finally, the fracture of the welded portion of the steel pipe did not occur.

(Modification)

8 and 9 are diagrams schematically showing a variation of the reinforcing steel pipe in the method for producing the steel pipe reinforcing struts according to the second embodiment, and Fig. 8 is a cross-sectional view in the front view and (a) and (Fig. 9). b) is a cross-sectional view showing the forward direction of the manufacturing step, and (c) of Fig. 9 is a side view showing a part of the finished product penetrating. In addition, the same or equivalent portions as those in the first embodiment are denoted by the same reference numerals, and a part of the description will be omitted.

In (a) of Fig. 8, chamfering (C chamfering) is performed on both side edges of the flat steels 22 and 24, and the flat steels 21 and 23 are maintained in a rectangular cross section (see Fig. 2). Further, (a) of Fig. 6 for explaining the third embodiment is an example of the reinforcing steel pipe 20 corresponding to (a) of Fig. 8.

In (b) of Fig. 8, the flat steels 21, 22, 23, and 24 are all chamfered (C chamfered) on the side edges of the single side.

In (c) of Fig. 8, the flat steels 21 and 23 are chamfered (C chamfered) on one side edge, and the flat steel 24 is chamfered (c chamfered) on both side edges. The flat steel 22 maintains the rectangular shape of the section. Further, (b) of Fig. 6 for explaining the third embodiment is an example of the reinforcing steel pipe 20 corresponding to (c) of Fig. 8.

In (a) of Fig. 9, the side edges of the U-shaped reinforcing members 25 and 26 are provided with positioning members 50a and 50b at predetermined intervals spaced apart from each other in the longitudinal direction.

In the fifth step shown in (b) and (c) of Fig. 9, the reinforcing steel pipe 20 is temporarily assembled. At this time, the positioning members 50a and 50b can easily perform the alignment of the reinforcing member 25 and the reinforcing member 26, and the docking accuracy of both can be improved, and the reinforcing steel pipe 20 having high shape accuracy can be temporarily assembled.

Further, the positioning members 50a, 50b are not the strength members of the reinforcing steel pipe 20, and therefore are provided for the degree of positioning (for example, spot welding or the like). Further, the number of the positioning members 50a and 50b is not limited, and may be provided in the flat steel 22 and the flat steel 24 instead of the flat steel 21 and the flat steel 23, respectively. Further, the positioning members 50a, 50b may be provided after the reinforcing members 25, 26 are formed (after the fillet welding W1 or the partial penetration welding W2 is performed), and the flat steel 21 provided with the positioning members 50a, 50b in advance may be used. 23 forms reinforcing members 25, 26.

[Industrial availability]

According to the present invention, since it is not necessary to perform bending processing of the flat steel, and it is possible to suppress bending or warping of the steel pipe due to welding heat to form a reinforcing steel pipe, it can be widely used in a manufacturing method of various types of struts, and by the manufacturing method The struts made.

10‧‧‧ shaft material

11‧‧‧ Spindle

12‧‧‧Sub-shaft

13‧‧‧Sub-shaft

20‧‧‧ reinforcing steel pipe

21‧‧‧ flat steel

22‧‧‧ flat steel

23‧‧‧ flat steel

24‧‧‧ flat steel

25‧‧‧Reinforcing components

25a‧‧‧ inside corner

25b‧‧‧outer corner

26‧‧‧Reinforcing components

26a‧‧‧ inside corner

26b‧‧‧Outer corner

27a‧‧‧ inside corner

27b‧‧‧Outer corner

28a‧‧‧ inside corner

28b‧‧‧Outer corner

30‧‧‧End members

31‧‧‧Main-end components

32‧‧‧Auxiliary end members

33‧‧‧Auxiliary end members

34‧‧‧through holes

35‧‧‧through holes

40‧‧‧ pads

50‧‧‧ Positioning materials

70‧‧‧ welding machine

100‧‧‧Steel tube reinforcement struts

B1‧‧‧Width (spindle material)

B2‧‧‧Width (sub-shaft)

B3‧‧‧Width (main end component)

B4‧‧‧Width (secondary member)

W1‧‧‧ fillet welding

W2‧‧‧Partial penetration welding

W3‧‧‧Partial penetration welding

W4‧‧‧Partial penetration welding

W5‧‧‧Partial penetration welding

W24‧‧‧Partial penetration welding

W35‧‧‧Partial penetration welding

Fig. 1 is a top view and a side view showing a steel pipe reinforcing stay according to Embodiment 1 of the present invention.

Fig. 2 is a cross-sectional view showing the front side of the steel pipe reinforcing struts according to the first embodiment of the present invention.

Fig. 3 is a flow chart for explaining a method of manufacturing the steel pipe reinforcing struts according to the second embodiment of the present invention.

Fig. 4 is a cross-sectional view showing a top view, a side view, and a front view of each step of a method for producing a steel pipe reinforcing struts according to a second embodiment of the present invention.

Fig. 5 is a cross-sectional view showing a front view of each step of a method for producing a steel pipe reinforcing struts according to a second embodiment of the present invention.

Fig. 6 is a cross-sectional view showing a sixth step (S6) of the method for producing a steel pipe reinforcing struts according to a third embodiment of the present invention.

Fig. 7 is a top view and a side view and a cross-sectional view of a front view of a test piece used in the performance comparison experiment of the embodiment.

Fig. 8 is a cross-sectional view showing a front view showing a modified example of a reinforcing steel pipe in a method for producing a steel pipe reinforcing struts according to a second embodiment.

Fig. 9 is a side elevational view showing a part of the modified example of the reinforcing steel pipe in the method for producing the steel pipe reinforcing struts according to the second embodiment.

10. . . Shaft

11. . . Spindle

12. . . Secondary shaft

13. . . Secondary shaft

twenty one. . . flat steel

twenty two. . . flat steel

twenty three. . . flat steel

twenty four. . . flat steel

25a. . . Inner corner

25b. . . Outer corner

26. . . Reinforcement member

26a. . . Inner corner

26b. . . Outer corner

27b. . . Outer corner

28a. . . Medial corner

28b. . . Outer corner

40a, 40b. . . Pad

100. . . Steel pipe reinforcement struts

B1. . . Width (spindle material)

B2. . . Width (sub-shaft)

B3. . . Width (main end member)

B4. . . Width (secondary member)

W1. . . Fillet welding

W4. . . Partial penetration welding

W5. . . Partial penetration welding

W24. . . Partial penetration welding

W35. . . Partial penetration welding

Claims (12)

A steel pipe reinforcing struts, comprising: a main shaft material formed by flat steel, and a reinforcing steel pipe for surrounding the outer surface deformation of the main shaft material surrounding the main shaft material, wherein the reinforcing steel pipe is a four-piece flat steel side edge In the butt joint, the outer corner portion is formed by partial penetration welding, and the inner corner portion of the steel pipe opposite to the side edge of the main shaft material is formed by fillet welding to form a rectangular cross section. The steel pipe reinforcing struts according to claim 1, wherein a backing plate is disposed in a gap between the inner corner portion of the reinforcing steel pipe after the fillet welding and the side edge of the main shaft member. The steel pipe reinforcing struts according to the first aspect of the invention, wherein the side surface of the main shaft material is provided with a secondary shaft member made of flat steel. The steel pipe reinforcing struts according to the second aspect of the invention, wherein the side surface of the main shaft material is provided with a secondary shaft member made of flat steel. The steel pipe reinforcing struts according to any one of the first to fourth aspects of the present invention, wherein the end portion of the spindle shaft in the axial direction is provided with a flat steel having a length wider than a diagonal of the reinforcing steel pipe. End member. A method for manufacturing a steel pipe reinforcing struts, comprising: a main shaft material formed by flat steel; and a reinforcing steel pipe for surrounding the outer surface deformation of the main shaft material surrounding the main shaft material, characterized in that: having a pair of flat steel sides The edge is butt jointed, and the inner corner of the fillet weld is finally welded, and the outer corner is intermittently welded in the axial direction by partial penetration welding to form a cross-sectional U-shaped reinforcing member; The side edge and the last welded part of the above reinforcing member a state in which the side corners are opposed to each other, the side edges of the pair of reinforcing members are butted together, and the outer corner portions are intermittently welded in the axial direction by partial penetration welding, and the step of temporarily assembling the cross-section rectangular reinforcing steel pipe; Partial penetration welding is carried out to perform the final welding of the outer corners after the temporary welding of the reinforcing steel pipes, and finally to assemble the reinforcing steel pipes. The method for producing a steel pipe reinforcing struts according to claim 6, wherein in the step of finally assembling the reinforcing steel pipe, the final outer corner portions of the outer corner portions after the temporary reinforcing of the reinforcing steel pipe are simultaneously performed. welding. The method for producing a steel pipe reinforcing struts according to claim 6, wherein the step of temporarily assembling the reinforcing steel pipe has a gap between the inner corner portion and the side edge of the main shaft after the final welding of the reinforcing member. The steps to configure the pad. The method for producing a steel pipe reinforcing struts according to claim 7, wherein the step of temporarily assembling the reinforcing steel pipe has a gap between the inner corner portion and the side edge of the main shaft after the final welding of the reinforcing member. The steps to configure the pad. The method for producing a steel pipe reinforcing struts according to any one of claims 6 to 9, wherein the side surface of the main shaft member is provided with a secondary shaft member made of flat steel. The method for producing a steel pipe reinforcing struts according to any one of the sixth aspect, wherein the end portion of the spindle shaft in the axial direction is provided with a flat steel having a length wider than a diagonal of the reinforcing steel pipe. The resulting end member. The method for producing a steel pipe reinforcing struts according to claim 10, wherein the end portion of the spindle shaft in the axial direction is provided with an end member made of flat steel having a length wider than a diagonal line of the reinforcing steel pipe.