JP4859118B2 - Reinforcement method for existing steel structural members - Google Patents

Description

  The present invention relates to a method for reinforcing an existing steel structural member such as a column or a beam constituting an existing steel structure. More specifically, the present invention relates to a pair of chord members that extend opposite to each other and a span between the chord members. The present invention relates to a method for reinforcing an existing steel structural member having a plurality of lattice materials.

Reinforcement of existing steel structures is required, for example, when reinforcing existing steel structures whose strength has decreased due to secular change, or for existing steel structures with insufficient seismic performance. For example. In addition, steel structures that require reinforcement include various steel support structures such as the frameworks of steel buildings.
When reinforcing an existing steel structure member constituting an existing steel structure using a reinforcing steel material, a technique for joining the reinforcing steel material to the existing steel structure member by welding is already known (Patent Document 1).
When joining a reinforcing steel material to an existing steel structural member by welding, the reinforcing steel material is aligned and then tack welding is performed, and then main welding is performed.
However, welding work requires welding curing from tack welding to main welding, and welding work can only be performed by qualified personnel with a high level of skill. There was a disadvantage in making it easier.
JP-A-8-276889

On the other hand, when reinforcing existing steel structural members such as columns and beams that have a pair of strings extending opposite to each other and a plurality of lattice materials spanned between the strings, only the lattice material is reinforced. In some cases, the lattice material may be reinforced at the same time as the string material.
In such a case, if the reinforcing steel materials are individually welded to a plurality of lattice materials, the welding work requires welding curing from the tack welding to the main welding as described above. Since only qualified personnel with advanced skills can do it, construction costs and personnel assignment are troublesome, which is disadvantageous in shortening the construction period.
In addition, it is conceivable to use bolts and nuts to fasten a large number of reinforcing steel and lattice materials. In this case, a large number of bolt insertion holes are provided in the lattice material so that the bolts can be inserted. Therefore, there is a disadvantage in that it takes time to drill holes in the lattice material, reduces the construction cost, and shortens the construction period.
The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the work by qualified persons and quickly arrange personnel when reinforcing a lattice material constituting an existing steel structural member. Therefore, it is to provide a new reinforcing method that is advantageous in shortening the construction period and reducing the construction cost.

In order to achieve the above object, the present invention is an existing steel structure member that constitutes an existing steel structure, and includes a plurality of strings consisting of a pair of chord members extending opposite to each other and a flat steel spanned between the chord members. A method of reinforcing a lattice column or a lattice beam having a lattice material, and a length corresponding to the portion of the lattice material exposed between the pair of string members, and capable of being applied over the entire length of the lattice material portion. A plurality of reinforcing steel materials having a suitable abutting surface are prepared, and as the reinforcing steel material, two flanges are orthogonal to each other, the outer surface of one of the flanges is the abutting surface, and the outer surface is the abutting surface. flanges that are attached surface with angle irons having a width same flange width and the flat bar, the flanges to the drill screw or hit write to said outer surface is said abutting surfaces so as to penetrate the abutting surface Forming a through hole in the stud, it abutted against the abutting surface of each of said each lattice member the flange width of the flange, wherein the outer surface to the width of the flat bar is to the abutting surfaces made to match said flange, said A drill screw or a driving rod is driven into the lattice material from an insertion hole, and the flange of the angle steel is attached to the lattice material in a state where the abutting surface is in close contact with the lattice material.
Further, the present invention provides an existing steel structure member constituting an existing steel structure, and a plurality of lattices comprising a pair of chord members extending opposite to each other and a flat steel spanned between the chord members. A method of reinforcing a lattice column or a lattice beam having a material and a length that corresponds to the portion of the lattice material exposed between the pair of chord materials and can be applied over the entire length of the portion of the lattice material A plurality of reinforcing steel materials having an abutting surface is prepared, and as the reinforcing steel material, two flanges are orthogonal to each other, an outer surface of one of the flanges is the abutting surface, and the outer surface is the abutting surface. The flange to be used is an angle steel having the same flange width as that of the flat steel, and an insertion hole for a driving rod is formed in the flange whose outer surface is the abutting surface so as to penetrate the abutting surface. Then both The abutting surfaces in forming the spot facing surface portion of the flange around the through hole, wherein the flange width of the flange width to the outer surface of the flat bar is the abutting surfaces made to match each lattice The flange surface of the angle steel is applied to the lattice material in a state in which the abutting surface of the flange is applied to each of the materials, a driving rod is driven into the lattice material from the insertion hole, and the abutting surface is in close contact with the lattice material. It is designed to be attached.

According to the present invention, since the reinforcing steel material is attached to each of the plurality of lattice materials constituting the column, it is possible to improve the in-plane and out-of-plane rigidity performance and the cross-sectional area of the column.
When reinforcing a lattice material, a plurality of reinforcing steel materials can be attached to the lattice material using a drill screw or a driving rod, and this work can be done using an electric or pneumatic driver or a hammer. Since it can be performed easily, work by qualified personnel can be reduced and personnel can be allocated quickly, which is advantageous for shortening the construction period and reducing the construction cost.
In addition, the lattice material can be reinforced without using fire, and therefore, there is no need for fire curing during welding, which is advantageous in shortening the construction period and reducing the construction cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view of a column, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA in FIG.
In the present embodiment, a case where the present invention is applied to a column 12 that supports a roof 10 of an existing steel structure 8 will be described as an example.
A column (lattice column) 12 that is an existing steel structural member includes a pair of string members 14 extending opposite to each other, and a plurality of lattice members (diagonal members) 16 spanned between the string members 14. It consists of
In the present embodiment, each string member 14 is configured by disposing two flanges 1402A of angle irons 1402 to face each other.
Moreover, the lattice material 16 is comprised with the shape steel, and the flat steel is used as a shape steel in this Embodiment.
Both ends of the lattice material 16 in the longitudinal direction are sandwiched between the flanges 1402A of the two angle steels 1402 of each string material 14, and are fixed by fastening bolts and nuts or by welding.

In the present embodiment, when such a lattice material 16 is reinforced, the lattice material 16 has a length corresponding to the portion of the lattice material 16 exposed between the pair of string materials 14, and more specifically, the pair of string materials 14. A plurality of reinforcing members each having a length over substantially the entire length of the portion of the lattice material 16 exposed between them and having an abutment surface that can be applied over substantially the entire length of the portion of the lattice material 16 exposed between the pair of chord materials 14 A steel material 20 is prepared.
Die steels having various cross-sectional shapes can be used as the reinforcing steel material 20, and the cross-sectional shape of the die steel is appropriately selected according to the strength to be reinforced, the cross-sectional shape of the lattice material 16, and the like.

In the present embodiment, angle steel is used as the reinforcing steel material 20.
The angle steel has flanges 2002 orthogonal to each other, and the outer surface of one of the flanges 2002 is the abutting surface 2004.
As shown in FIG. 3, the flange 2002 whose outer surface is the abutting surface 2004 has the same flange width as that of the flat steel constituting the lattice material 16.
A plurality of insertion holes 2010 of drill screws or driving holes 22 are formed in the flange 2002 to be the abutment surface 2004 at intervals in the extending direction of the flange 2002 so as to penetrate the flange 2002. Keep it. The pitch of the insertion holes 2010 is, for example, about 50 to 100 mm. In the drawing, a case where the driving rod 22 is used is illustrated.
Then, each reinforcing steel material is made by matching the flange width of the flange 2002 whose outer surface is abutted with the width of the flat steel constituting the lattice material 16 at the location of each lattice material 16 exposed between the string materials 14. The 20 abutting surfaces 2004 are applied, a drill screw or a driving rod 22 is driven into the lattice material 16 from the insertion hole 2010, and the reinforcing steel material 20 is attached to the lattice material 16.

The drill screw includes a head, a screw portion protruding from the head, and a drill blade protruding from the tip of the screw portion, and the drill blade at the tip makes a pilot hole for tapping in the steel plate during construction, The screw part is tapped into the lower hole to complete the tightening, and the contact surface 2004 of the flange 2002 is in close contact with the surface of the lattice material 16 by using an electric or pneumatic driver. Can be easily and securely attached.
The driving rod 22 has a head portion and a shaft portion, and the tip portion of the shaft portion is sharp and sharp, and can be lowered by using an air-type, gas-type, or explosive-type driving device. It is a saddle that can be driven into a steel material as if a nail is driven into a wood, and the abutting surface 2004 of the flange 2002 is in close contact with the surface of the lattice material 16 without rattling like a drill screw. Can be easily and securely installed in the state.
In addition, if the drill screw and the insertion hole (lower hole) 2010 of the driving rod 22 are formed in advance in the flange 2002 as in the embodiment, it is extremely advantageous to increase the construction efficiency.

According to the present embodiment, the reinforcing steel material 20 is attached to each of the plurality of lattice members 16 constituting the column 12, so that the in-plane and out-of-plane rigidity performance and the cross-sectional area of the column 12 can be improved. It becomes possible.
Further, when the lattice material 16 is reinforced, a plurality of reinforcing steel materials 20 are respectively attached to the lattice material 16 using a drill screw or a driving rod 22, and this operation is performed by an electric or pneumatic driver. Since it can be done easily using a hammer or a hammer, etc., it is advantageous for reducing work by qualified personnel and allocating personnel quickly, shortening the construction period, and reducing construction costs.
Further, in the present embodiment, since the drill screw or the driving rod 22 is used, the lattice material 16 can be reinforced without using fire, and therefore, the heat curing at the time of welding becomes unnecessary and the construction period is shortened. And it is advantageous in reducing the construction cost.

Next, a second embodiment will be described.
FIG. 4 is a cross-sectional view showing a coupled state between the lattice material and the reinforcing steel material.
In the second embodiment, when the driving rod 22 is used and the thickness of the lattice material 16 to be reinforced is increased, for example, when the thickness exceeds about 3 to 6 mm, the insertion hole 2010 has an insertion hole 2010. The counterbore surface 2020 is formed at a location around the.
More specifically, a spot facing surface is formed at a location around the abutting surface 2004 with the abutting surface 2004 being a surface that matches the flat steel.
The driving rod 22 pushes the base material of the lattice material 16 and penetrates the lattice material 16. Therefore, bulging portions 16A and 16B are formed at both the penetrating side and the penetrating side where the driving rod 22 is driven, and the size of the bulging portions 16A and 16B is as follows. The thickness of the lattice material 16 into which the driving rod 22 is driven depends on the material, but is not negligible when it exceeds about 3 to 6 mm, for example. That is, if the spot face 2020 is not formed at the place around the insertion hole 2010 on the abutment surface 2004, the abutment surface 2004 is lifted from the lattice material 16 by the bulging portion 16A, and as a result, the reinforcement The reinforcing effect is impaired by the contact surface 2004 of the steel material 20 and the lattice material 16 not being in close contact with each other. In the present embodiment, a counterbore surface 2020 is provided, the bulging portion 16A is accommodated inside the counterbore surface 2020, and the abutment surface 2004 and the lattice material 16 are brought into close contact with each other so that an intended reinforcing effect can be obtained. I have to.

In addition, what is necessary is just to join the both ends of the steel material 20 for reinforcement to the chord material 14 respectively by welding, when expecting the increase effect of the tensile strength of steel structural members, such as a column and a beam.
In this case, a portion of the reinforcing steel material 20 extending over the entire length in the longitudinal direction is attached to the lattice material 16 by a drill screw or a driving rod 22, and therefore, a welding site is not a portion extending over the entire length of the reinforcing steel material 20 in the longitudinal direction. Since only the both ends of the reinforcing steel material 20 are required, welding work is required, but this is advantageous in simplifying curing for welding, shortening work time, and reducing costs.

  Moreover, although the case where the existing steel structure member which has a lattice material is a pillar was demonstrated in this Embodiment, this invention is applicable to various existing steel structure members, such as a beam which has a lattice material.

It is a front view of a pillar. It is AA sectional drawing of FIG. It is AA sectional drawing of FIG. It is sectional drawing which shows the coupling | bonding state of a lattice material and the steel material for reinforcement.

Explanation of symbols

12 ... pillar, 14 ... string material, 16 ... lattice material, 20 ... reinforcing steel material, 2002 ... flange, 2004 ... abutment surface, 2010 ... insertion hole, 22 ... driving rod.

Claims (3)

Lattice pillar or lattice comprising a pair of chord members extending opposite to each other and a plurality of lattice members made of flat steel spanned between the chord members and existing steel structural members constituting the existing steel structure A method of reinforcing beams ,
Preparing a plurality of reinforcing steel materials having an abutment surface that can be applied over the entire length of the lattice material portion at a length corresponding to the portion of the lattice material exposed between the pair of string materials;
As the reinforcing steel material, two flanges are orthogonal, the outer surface of one of the flanges is the abutting surface, and the flange whose outer surface is the abutting surface is the same as the width of the flat steel. Using angle steel with flange width,
Forming an insertion hole for a drill screw or a driving rod in the flange whose outer surface is the abutting surface so as to penetrate the abutting surface ;
The flat abutting the abutting surface said outer surface is made to match the flange width of the flange that is the abutting surface to the width of each said flange to the each lattice material steel, the insertion hole from the drill screw or implant tacks The flange of the angle steel is attached to the lattice material in a state where the abutting surface is in close contact with the lattice material.
Reinforcement method for existing steel structural members. Lattice pillar or lattice comprising a pair of chord members extending opposite to each other and a plurality of lattice members made of flat steel spanned between the chord members and existing steel structural members constituting the existing steel structure A method of reinforcing beams ,
Preparing a plurality of reinforcing steel materials having an abutment surface that can be applied over the entire length of the lattice material portion at a length corresponding to the portion of the lattice material exposed between the pair of string materials;
As the reinforcing steel material, two flanges are orthogonal, the outer surface of one of the flanges is the abutting surface, and the flange whose outer surface is the abutting surface is the same as the width of the flat steel. Using angle steel with flange width,
The outer surface of the flange that is used as the abutment surface so as to penetrate the abutment surface forms an insertion hole for the driving rod, and the countersink surface is formed at the flange around the insertion hole on the abutment surface. Form the
The flat bar width said outer surface so that matching the flange width of the flange to be the abutting surface abutting the abutting surface of each of the flanges wherein each lattice material, said lattice material tack driving from the insertion hole The flange of the angle steel was attached to the lattice material in a state where the abutting surface was in close contact with the lattice material.
Reinforcement method for existing steel structural members. Both ends in the longitudinal direction of the reinforcing steel material are joined to the corresponding string material by welding,
3. A method for reinforcing an existing steel structural member according to claim 1 or 2.

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