JP4025708B2 - Square steel box column - Google Patents

Description

  The present invention relates to a square steel box column used when a steel structure building is constructed.

In recent years, a square steel box having a square closed cross section, a high rigidity, and a relatively stable strength characteristic has been widely used as a column material. And welding box.
In general, for example, as shown in FIG. 8 (a), the cold forming box a is formed into a circular shape with a well-known roll forming machine as shown in FIG. As shown in FIG. 8 (b), the side ends of the pair of groove-forming bodies aa obtained by press-forming two thick steel plates s as shown in FIG. And obtained by performing two seam welding on opposite side ends in the length direction by arc welding aw, or, as shown in FIG. 8 (c), a corner obtained by press forming a single thick steel plate s. There are those obtained by performing one seam welding aw by arc welding aw on both side ends of the formed shape ac in the length direction.
Further, in the welding box d, for example, as shown in FIG. 8 (d), each side end of the four thick plates s is positioned so as to form a square box, and the adjacent thick plates s are adjacent to each other. There are those formed by welding the side ends in the length direction.

However, when these simple-shaped square steel boxes a and d are used as column members, FIG. 9A shows a case of single use, and FIG. 9B shows a case where concrete kc is filled inside. ), And there is a limit in terms of buckling control. Therefore, there is a high demand for further improving the buckling resistance. Moreover, since the manufacturing process of these square steel boxes is complicated, there is a demand for reduction in manufacturing cost because the cost tends to be higher than that of hot rolled H-section steel.
As an example of a method of suppressing buckling and deformation at the beam joint when a square steel box is used as a column, for example, a method of increasing the plate thickness of a square steel box is simple, but weight reduction, processing There is a problem that it cannot respond to sex requests. As another example of the method, for example, as shown in FIG. 10, a method of using a square steel box a ′ in which a rib plate rp is welded and stiffened to the inner side of each thick steel plate s in a welding box d is considered. It is done. In this case, when the rib plate rp is filled with concrete to form a composite column, it is effective for strengthening the bond strength with concrete. However, since the application of this method is limited to the welding box, the burden of welding work further increases. And there is a cost problem. There is also a concern that the strength of the box body may be reduced in the vicinity of the rib plate rp weld.

As another method example, in Patent Document 1, for example, specially shaped column parts are manufactured by hot pressing and welded to form a steel structure column or rolled into two parts. It is disclosed to weld a grooved steel to become a columnar material of steel structure by welding a square steel that reinforces the corners to the corners of the bending of the grooved steel. In this case, there is a problem in terms of cost because there are many welding parts, such as the fact that the size is limited and a wide range of sizes cannot be handled, and the square steel is welded to the corners of the grooved steel divided into two.
On the other hand, recently, as shown in FIGS. 11 (a) and 11 (b), an H-shaped steel beam 3 is attached to a high-strength bolt 5 via a T-shaped metal fitting 2 joined to a square steel box column 1 with a high-strength bolt 4. As shown in FIGS. 11 (b) and 11 (c), the beam-to-beam joint structure is joined by the force transmitted from the H-shaped steel beam 3 as shown in FIGS. Due to the moment M generated in the part A, there is a problem that the square steel box column 1 undergoes deformation (in-plane and out-of-plane deformation or out-of-plane deformation) as shown in (c), for example, and the strength is lowered. For example, in the case of Patent Document 2, it is possible to form a high-rigidity beam joint by welding a thick rectangular steel pipe between long rectangular steel pipes (square steel box columns). However, in this case, welding work is required in addition to the manufacture and processing of short rectangular steel pipes. From that, there is a cost problem.
JP-A-7-3941 JP 2000-227061 A

  The present invention is a square steel that can suppress buckling and deformation of the beam joint when used as a column material, and can reinforce the bond strength with concrete when it is filled with concrete to form a composite column. Providing Bok Pillars at relatively low cost.

In order to solve the above-described problems, the present invention has the following (1) to (8).
(1) Unequal groove steel consisting of a long side flange, a short side flange and a web (the basic shape is different in the width of both flanges facing each other through the web, and both flanges are parallel or non-parallel irregular shapes) Including equilateral grooved steel, hereinafter collectively referred to as “unequal grooved steel”) Square box box made by welding four long sides in the length direction, and one adjacent unequal groove The end of the long-side flange of the section steel is butted against the corner portion that is the intersection of the short-side flange of the other unequal groove-shaped steel and the web, and the space formed in this butted portion is welded and joined as a groove, A rectangular column box made of square steel, wherein four sides are formed by a long side flange and a web of each unequal side grooved steel, and a reinforcing rib is formed by projecting the short side flange inward.
(2) In (1), the height of the reinforcing rib composed of the short side flange is in the range of 0.05 to 0.25 of the distance between the outer surfaces of the opposing sides of the square steel box. Steel box pillar.

(3) In (1) or (2), a square steel box column characterized by having a bent portion at the tip of a reinforcing rib made of a short side flange.
(4) The square steel box column according to any one of (1) to (3), wherein the reinforcing rib formed of a short side flange has a plurality of through holes.
(5) In any one of (1) to (3), the reinforcing rib made of a short-side flange has a plurality of protrusions on the surface, and is a square steel box column.
(6) In any one of (1) to (5), a square steel box column having a bolt hole for bolting a metal fitting on a side surface including a long side flange and a web.
(7) The square steel box column according to (6), wherein a nut is fixed to the inner side of the bolt hole directly or via a washer.
(8) The square steel box column according to any one of (1) to (7), wherein concrete is filled inside to form a square box column having a concrete composite structure.

The square steel box column of the present invention is obtained by welding four unequal side grooved steels composed of a long side flange, a short side flange, and a web. At this time, between adjacent unequal side grooved steels. It is possible to perform welding without the need for a groove for welding, and at the same time, it is possible to project a reinforcing rib by a short-side flange of each unequal groove-shaped steel to the inner side. In addition, it has a stiffening function that suppresses deformation of the beam joint, and has a function of strengthening the binding force with concrete when it is filled with concrete to form a composite column.
In particular, since welding for forming reinforcing ribs is not required, manufacturing is simple, and manufacturing costs and processing costs can be greatly reduced. It is possible to reduce the material cost and reduce the material cost.

A structural example of the square steel box column of the present invention will be described below based on the drawings. The square steel box pillar of the present invention is used to join one or a plurality of square pillars to a predetermined length, and joins the H-shaped steel beam via a diaphragm welded to the beam joint. Although it may be used for the beam joint structure, here, as shown in FIGS. 11 (a) and 11 (b), the T-shaped hardware 2 which becomes a joint hardware is joined to the beam joint with a high-strength bolt 4. An example of the structure of a square steel box column 1 when used in a column beam joint structure in which an H-shaped steel beam 3 is joined to a T-shaped hardware 2 with a high-strength bolt 5 is shown. The joint has a bolt hole 6o for joining the T-shaped metal piece 2.
As shown in FIG. 1, the square steel box column 1 of the present invention basically has an unequal groove shape as shown in FIG. 2 (a), which is composed of a long side flange 6a, a short side flange 6b, and a web 6c. four steel _{6 1} and _{6 2} and _{6 3} and _{6 4,} adjacent one of the scalene interposition steel (e.g. ₆₁₎ of the side edge portions of the long side flanges 6a, the other scalene interposition steel ( For example, it is arranged so as to abut on the outside of the corner portion 6k that is the intersection of the short side flange 6b and the web 6c of 6 ₂ ), and is obtained by welding w joining with the space formed in this abutting portion as a groove. The four sides are formed by the long side flange 6a and the web 6c of each unequal side grooved steel, and the reinforcing ribs 8 are formed by projecting the short side flanges 6b to the inside of the four sides.

Square steel box columns 1 of the present invention is scalene interposition steel 6 ₁ and 6 ₂ and 6 ₃ and 6 ₄ is obtained by welding w, at the time of welding, and FIG. 2 (b) As shown in, because the groove function can be given to the space formed (communication) in the butt portion of adjacent unequal side grooved steel, for welding w between adjacent unequal side grooved steel There is no need to rework the groove.
Further, since the reinforcing ribs 8 by the short side flanges 6b can be formed on the inner side by welding w of each unequal side grooved steel, manufacturing is not particularly necessary because the processing for forming the reinforcing ribs 8 is not required. It is simple and can greatly reduce the manufacturing cost.
In addition, although the reinforcing rib 8 is formed, due to the reinforcing effect by this, the thickness of the entire steel material is reduced and the weight can be reduced and the weight can be reduced, so that the cost of the used steel material can be reduced. is there. For example, in the case of a square steel box column in which the distance D between the opposite sides is 400 mm, a square steel box column with a simple shape that has a plate thickness of 19 mm and ensures strength because it does not have reinforcing ribs. The square steel box column 1 of the present invention in which the reinforcing rib 8 having a height Lb of 50 mm is formed, and the plate thickness is reduced to 16 mm and 3 mm, so that the strength is comparable to that of a simple shaped square steel box column. As a result, the total weight of the used steel material can be reduced by about 8%, and the steel material cost can be reduced.

The non-equal-side grooved steel 6 (6 _{1 to} 6 ₄ ) constituting the square steel box column 1 of the present invention is mainly manufactured by using a thick steel plate as a raw material and press-molding or roll-molding it. As shown in FIG. 2 (a), when welding adjacent non-equal-side grooved steel, the corner portion (outside) that is the intersection of the web 6c and the short-side flange 6b is particularly arranged so that the groove processing can be omitted. Further, it is preferable that the corner portion 6k having a predetermined radius of curvature R exists. When the plate thickness is t, R is preferably in the range of 2t to 4t.
By adopting such a shape, as shown in FIG. 2 (b), the side end portion of the long side flange 6a of _one adjacent unequal grooved steel (for example, 6 ₁ ) and the other unequal grooved Groove spaces 7a and 7b that communicate with each other are formed between the corners (outside) of the web 6c of steel (for example, 6 ₂ ) and the short side flange 6b, and are welded as shown in FIG. 2 (c). It is preferable that the weld metal is continuous between the outer side and the inner side when w.

This reinforcing rib 8 has a stiffening function for suppressing buckling and deformation of the beam joint when used as a column material, and a binding force with concrete when filling the concrete with a composite column. The height Lb of the reinforcing rib 8 (here, the length of the short-side flange 6b) depends on the plate thickness, but the relative height of the square steel box column 1 is relatively high. The range of the distance D between the outer surfaces of the sides to be in the range of 0.05 to 0.25, particularly about 0.1 to 0.2 is preferable.
When the distance D between the outer surfaces of the sides is less than 0.05, it is not possible to sufficiently secure the stiffening function and the function of strengthening the bonding force with the concrete when the concrete is filled inside. In addition, when the distance D between the outer surfaces of the sides is more than 0.25, there is an effect of strengthening the stiffening function and the strengthening function of the binding force with concrete, but the weight reduction, material (steel) cost and processing cost. There is a problem of increase of Therefore, the upper limit is suppressed to about 0.25.
Therefore, the length Lb of the short side flange 6b forming the reinforcing rib 8 is the thickness t, the length La of the long side flange 6a, the length Lc of the web 6c, and the outer surface of the side of the square steel box column 1 From the relationship with the distance D etc., it is set so as to satisfy such a condition. (Corresponding to the embodiments of claims 1 and 2).

The reinforcing rib 8 is formed with a bent portion 8a that is bent at a right angle at the tip, as shown in FIG. 3A, in order to further enhance the stiffening function and the function of strengthening the binding force with concrete. It is also effective to use irregularly shaped irregularly shaped steel 6 as the irregularly shaped irregularly shaped steel 6. As shown in FIG. 3 (b), the bent portion 8a can be formed by bending the front end portion of the short side flange 6b inward (or outward) when forming each unequal side grooved steel 6. .
In place of the reinforcing rib 8 formed with the bent portion 8a in FIG. 3 (b), as shown in FIG. 3 (c), the short side flange 6b itself is formed into the web 6c when forming each unequal side grooved steel. Further, the long ribs 6a and the non-parallel reinforcing ribs 8 may be formed so that the angle is 90 degrees or less (or 90 degrees or more), and the irregularly shaped irregular steel 6 may be formed. . This case is also effective for strengthening the bond strength with concrete. (Corresponding to the embodiment of claim 3).

4 (a) and 4 (b) are square steel box columns 1 as shown in FIG. 1, and in particular, when concrete is filled into the square steel box columns 1 to form composite columns, In order to reinforce the binding force with concrete, the reinforcing rib 8 is a square steel box column provided with a plurality of through holes 9 having a size through which concrete flows. The through-hole 9 can be formed by opening the through-hole 9 in the short-side flange 6b when the unequal-side grooved steel 6 is formed.
In addition, even if this through-hole 9 is provided in the reinforcing rib 8 as shown in FIGS. 3A, 3B, and 3C, there is a corresponding effect for strengthening the bonding force with the concrete. (Corresponding to the embodiment of claim 4).

5 (a) and 5 (b) are rectangular steel box columns 1 as shown in FIG. 1, particularly when concrete is filled into the rectangular steel box columns 1 to form a composite column. Is a square steel box column 1 in which a plurality of protrusions 10 a and studs 10 b are formed on the surface of the reinforcing rib 8. Since the protrusion 10a is formed by pressing here, a recess 10b is formed on the back side thereof.
The protrusions 10a and the recesses 10b can be directly formed on the short side flange 6b as shown in FIG. 5B when the unequal side grooved steel 6 is formed by press molding, for example. Further, the stud 10s can be formed by welding w or the like to the short side flange 6b by forming the unequal side grooved steel 6 and then welding it.
The protrusions 10a (recesses 10b) and the studs 10s are provided to reinforce the bonding force with the concrete even when the protrusions 10a (recesses 10b) and the studs 10s are provided on the reinforcing ribs 8 as shown in FIGS. Has a corresponding effect. (Corresponding to the embodiment of claim 5).

  Each of the rectangular steel box columns 1 of the present invention described above is used as a column material that constitutes a column beam joint for joining H-shaped steel beams, and therefore is provided on a side surface (side) composed of a long side flange 6a and a web 6c. A bolt hole 6o for bolt joining is provided and used. The drilling of the bolt hole 6o may be performed after making a square steel box, or at the stage of the unequal side grooved steel 6 before making the square steel box, the side surface (side) that becomes the beam joint. You may carry out with respect to the long side flange 6a and web 6c which form.

6 (a), 6 (b) and 6 (c) show an example of a column beam joint structure using the square steel box column 1 of the present invention. Actually, the T-shaped hardware 2 is bolted to one side surface to four side surfaces, but here, the main part of the structure when the T-shaped hardware 2 is joined to one side surface is shown as a representative.
In this example, a nut 11 (single or with a washer) is arranged on the inner side of a square steel box column 1, and a torcia head tightening high-strength bolt 12 is inserted through a washer 13 to form a square steel box column 1. Is inserted into the bolt hole 2o and the bolt hole 6o from the outside of the T-shaped metal piece 2 that is in contact with the outside of the steel plate, screwed into the nut 11 and tightened to form a beam joint. It has a column beam joint structure in which the beam 3 is joined by a high strength bolt 5.
Besides this column beam joint structure example, for example, as shown in FIGS. 11 (a) and 11 (b), a square steel box is formed by inserting high strength bolts into the bolt holes from the inside of the square steel box column 1. A beam-joint structure in which a beam joint for tightening the nut 11 is formed on the outer side of the T-shaped hardware 2 in contact with the side surface of the 1 and the H-shaped steel beam 3 is joined to the T-shaped hardware 2 with a high-strength bolt 5 is also used. is there. (Corresponding to the embodiment of claim 6).

In the beam-column joint structure shown in FIGS. 6 and 11, there are cases in which it is not possible to manually insert bolts or place nuts from the open end of the square steel box 1 to which the T-shaped hardware 2 is joined. After the steel box column 1 is formed, it is not easy to insert bolts and place (fix) nuts on the inner side.
However, in the beam joint structure shown in FIG. 6, the square steel box 1 is formed as shown in FIG. 6C at the stage of the unequal side grooved steel 6 before the nut 11 is made into a square steel box. A square steel in which bolt holes are drilled in the long side flange 6a and the web 6c in advance so that necessary bolt holes 6o are sometimes formed at predetermined positions on the side surfaces, and the nut 11 is fixed by welding or bonding directly or via a washer. By using the box-made column 1, it is easy to insert and tighten the torcia-type head-clamping high-strength bolt 12 from the outside of the T-shaped hardware 2 that is in contact with the side surface of the square-steel box 1.
In such a structure, a torcia-shaped head tightening high strength can be easily and inexpensively attached to the square steel box column 1 without using expensive special bolts or highly difficult construction techniques. The high-strength bolt joint structure of the square steel box column 1 and the H-shaped steel beam 3 can be obtained more simply and inexpensively.
Even when the steel box column 1 of the present invention is used in the beam-column joint structure as shown in FIG. 11, the high-strength bolt 4 is inserted and temporarily fixed at the inside of the unequal side grooved steel 6. Although it is possible to place the T-shaped hardware 2 in a fixed manner, there is more advantage in the column beam joint structure as shown in FIG. (Corresponding to the embodiment of claim 7).

  Each of the above square steel box columns 1 is formed with reinforcing ribs 8 protruding inside, and has a stiffening function to suppress buckling and deformation of the beam joint when used as a column material. When the concrete is filled inside, it has a function of strengthening the binding force with the concrete by the anchor effect of the reinforcing rib 8, but when filling the concrete into a composite column, the concrete and 3 in which the reinforcing rib 8 is bent, the one in FIG. 4 in which the reinforcing rib 8 is provided with a through hole, the protrusion 10a and the recess b in the reinforcing rib 3, A square steel box column 1 having a structure that enhances the anchor effect, such as that of FIG. 5 provided with studs 5b, is more effective.

  FIGS. 7 (a) and 7 (b) show an example of a column beam joint structure in which a square column box 1 is filled with concrete kc to form a composite column. In this example, FIG. The beam joint structure using the square steel box column 1 having the reinforcing rib 8 formed with the bent portion 8a shown in a) and (b) is used, and the nut 11 is replaced with the square steel box column as in FIG. As shown in FIG. 6 (c), at the stage of the unequal groove-shaped steel 6 before 1, the bolt hole 6o necessary for a predetermined position on the side surface is formed when the square steel box pillar 1 is formed. Bolt holes are drilled in the long side flange 6a and the web 6c in advance, and the nut 11 is directly (or via a washer) fixed to the square steel box column 1 by welding or bonding. Insert the torcia-type head-clamping high-strength bolt 2 from the outside of the T-shaped hardware 2 in contact. After tightening the head, the concrete kc is filled and solidified inside the square steel box column 1 to form a beam joint portion by the synthetic column, and the H-shaped steel beam 3 is attached to the T-shaped hardware 2 with a high strength bolt 5. It is a column beam joint structure to be joined.

In this column-beam joint structure, the reinforcing rib 8 forms a bent portion 8a to enhance the anchor effect, and the bonding force with the concrete is further strengthened, so that buckling and deformation of the beam joint are sufficiently performed. Can be suppressed.
As another column beam joint structure example, for example, as shown in FIGS. 11A and 11B, a square steel box column is formed by inserting high strength bolts into the bolt holes from the inside of the square steel box column 1. After the nut 11 is tightened on the outer side of the T-shaped hardware 2 in contact with the side surface of 1 and a beam joint is formed, the concrete kc is filled and solidified inside the square steel box column 1 and the beam is joined by a composite column. There is also a column beam joint structure in which a portion is formed and the H-shaped steel beam 3 is joined to the T-shaped hardware 2 with a high-strength bolt 4. (Corresponding to the embodiment of claim 8).
The structure of the square steel box according to the present invention is not limited to the above structure, but is a beam joint form (whether the object to be joined is a diaphragm or a T-shaped metal), a joint part, and a joint means (various bolts or welding). ), Material strength, design strength, etc., within the range that satisfies the above claims.

The solid explanatory drawing which shows the structural example of the square steel box pillar of this invention. (A) The figure is a three-dimensional explanatory view of the unequal side grooved steel constituting the square steel box column of FIG. 1, and (b) the figure is a groove between the unequal side grooved steels of (a) figure to be welded. Partial cross-section explanatory drawing which shows the example of space formation, (c) figure is partial cross-sectional explanatory drawing which shows the formation example of the welding part between unequal side grooved steel. (A) The figure is a three-dimensional explanatory drawing showing an example of the structure of the square steel box column of the present invention in which concrete is filled to form a composite column. (B) The figure is a square steel box of Fig. (A). The three-dimensional explanatory drawing of the unequal side groove-shaped steel which comprises a pillar, (c) The figure is the three-dimensional explanatory drawing of the other unequal side groove-shaped steel which comprises the other square steel box pillar of this invention. (A) The figure is a three-dimensional explanatory drawing showing another structural example of the square steel box pillar of the present invention in which a composite pillar is constructed by filling concrete inside, (b) The figure is a square steel of (a) figure. The three-dimensional explanatory drawing of the unequal-side grooved steel which comprises a box box made of steel. (A) The figure is a three-dimensional explanatory drawing showing another structural example of the square steel box pillar of the present invention in which a composite pillar is constructed by filling concrete inside, (b) The figure is a square steel of (a) figure. Three-dimensional explanatory drawing of the unequal side grooved steel constituting the steel box column, FIG. 3C is a three-dimensional explanatory drawing of another unequal side grooved steel constituting the other square steel box column of the present invention. (A) The figure is a sectional plane explanatory view showing an example of a beam-column joint structure using the square steel box column of the present invention, (b) is a side cross-sectional explanatory view taken along the line Aa-Ab in FIG. (C) is front explanatory drawing which shows the example of nut fixation in an unequal side grooved steel. (A) The figure is a plane explanatory view showing an example of a beam-to-column joint structure using the square steel box column of the present invention in which a concrete column is formed by filling concrete inside, (b) Fig. (A) Ba-Bb arrow side cross-sectional explanatory drawing of a figure, (c) A figure is a front explanatory drawing which shows the example of nut fixation in an unequal side grooved steel. (A) The figure is front explanatory drawing which shows the example of a manufacturing method of a square steel box, (b) The front explanatory drawing which shows the other example of manufacturing methods of a square steel box, (c) The figure is a square steel. Front explanatory drawing which shows the other example of manufacturing methods of a box made from steel, (d) The figure is front explanatory drawing which shows the other example of manufacturing methods of a square steel box. (A) A figure is a plane explanatory view showing a buckling example with a square steel box column, (b) A figure is a plane explanatory view showing a buckling example with a concrete composite column. Plane explanatory drawing which shows the example of reinforcement structure of a square steel box pillar. (A) The figure is a three-dimensional explanatory drawing showing an example of a high-strength bolt joint structure of a square steel box column and an H-shaped steel beam using T-shaped hardware and high-strength bolts, and (b) is a diagram of FIG. Partial side cross-sectional explanatory diagram, three-dimensional conceptual explanatory diagram showing an example of the action of the force (moment) transmitted from the beam to the beam joint, (c) is an example of out-of-plane deformation and in-plane deformation at the beam-column joint FIG.

Explanation of symbols

1 Square steel box pillar 2 T-shaped hardware 2o Bolt hole 3 H-shaped steel beam 4 High strength bolt (for T-shaped hardware joint)
5 High-strength bolts (for connecting H-beams)
6, 6 _{1 to} 6 ₄ Unequal groove steel 6a Long side flange 6b Short side flange 6c Web 6o Bolt hole 6k Corner part 8 Reinforcement rib 8a Bending part 9 Through hole 10a Projection 10b Recess 10s Stud 11 Nut 12 Torcia head Fastening bolt 13 Tightening washer

Claims (8)

Square box box made by welding four non-equal groove steels consisting of a long flange, short flange and web in the length direction, and the long flange of one adjacent non-uniform groove steel The unequal side grooved steel is abutted against the corner of the other side of the other unequal side grooved steel with the short side flange and the web, and welded with the space formed in this butt part as a groove. A square steel box column having four sides formed by a long side flange and a web, and a reinforcing rib formed by projecting the short side flange inward. The height of the reinforcing rib composed of the short side flange is in the range of 0.05 to 0.25 of the distance between the outer surfaces of the opposing sides of the square steel box. Box pillar. The square steel box column according to claim 1 or 2, further comprising a bent portion at a tip portion of a reinforcing rib made of a short side flange. The square steel box column according to any one of claims 1 to 3, wherein the reinforcing rib made of a short-side flange has a plurality of through holes. The square steel box column according to any one of claims 1 to 3, wherein the reinforcing rib made of a short-side flange has a plurality of protrusions on the surface. The square steel box column according to any one of claims 1 to 5, further comprising a bolt hole for bolting a metal fitting on a side surface including a long side flange and a web. The square steel box column according to claim 6, wherein a nut is fixed directly or via a washer to an inner side of the bolt hole. The square box column according to any one of claims 1 to 7, wherein a square box column is formed by filling concrete into a concrete composite structure.

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