JP2008163586A - Reinforcing method and reinforcing structure for steel structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing method and a reinforcing structure, which enable the reinforcement of a steel structure such as an existing truss structure without using welding. <P>SOLUTION: The steel structure comprises a first engaging portion where one end of a reinforcement object member is engaged with a first main material, and a second engaging portion where the other end of the reinforcement object member is engaged with a second main material. A pair of reinforcing members is arranged in an axially symmetrical manner on the reinforcement object member; the first engaging portion is held in a sandwiched state by one-side ends of the pair of reinforcing members; and the second engaging portion is held in a sandwiched state by the other-side ends of the pair of reinforcing members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for reinforcing a steel structure and a reinforcing structure. More specifically, the present invention relates to a steel structure reinforcing method and a reinforcing structure for reinforcing an existing steel structure without welding.

  Conventionally, truss structures are used in large buildings from the viewpoint of weight reduction. Further, in this truss structure, a thin-walled steel pipe is used in order to reduce weight while ensuring a predetermined strength.

  However, the weather phenomenon has changed due to the effects of global warming. For example, a huge typhoon and local heavy snow have occurred. For this reason, revisions to the Building Standards Law and other measures are being made, and reinforcement in accordance with this revision is being made to existing buildings.

  This existing building is generally reinforced by welding a reinforcing member to a location where the strength is insufficient.

  However, there are the following problems in welding the reinforcing member in the existing truss structure.

  That is, 1) Since the member used for the truss structure is a thin-walled steel pipe as described above, there is a risk of falling off due to welding. This fear is promoted because the existing truss structure is often forced to weld in an unreasonable posture. 2) Since welding in an unreasonable posture is forced, there is a possibility that welding quality and reinforcing strength cannot be secured. 3) In order to prevent fire caused by welding sparks, curing is required and the work becomes complicated. 4) Welding equipment etc. must be moved in a confined area and workability is poor.

  The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a reinforcement method and a reinforcement structure that can reinforce a steel structure such as an existing truss structure without welding.

  In the method for reinforcing a steel structure according to the present invention, a first engagement portion in which one end portion of a member to be reinforced is engaged with the first main member, and the other end portion of the member to be reinforced is engaged with the second main member. A method for reinforcing a steel structure having a second engaging portion, wherein a pair of reinforcing members are arranged symmetrically with respect to the member to be reinforced, and the first end is formed by one end of the pair of reinforcing members. The engaging portion is sandwiched, and the second engaging portion is sandwiched by the other end portions of the pair of reinforcing members, whereby the load acting on the reinforcement target member is distributed to the pair of reinforcing members. It is characterized by reducing.

  In the method for reinforcing a steel structure according to the present invention, it is preferable that clamping is performed by fastening the end portions with bolts and nuts in a state where the engaging portions are sandwiched between the end portions of the pair of reinforcing members.

  On the other hand, in the reinforcing structure of the steel structure according to the present invention, the first engagement portion in which one end portion of the reinforcement target member is engaged with the first main material, and the other end portion of the reinforcement target member is the second main material. A reinforcing structure for a steel structure having a second engaging portion engaged with the reinforcing member, and comprising a pair of reinforcing members disposed axially symmetrically on the member to be reinforced, and one end portions of the pair of reinforcing members And the second engagement portion is sandwiched between the other end portions of the pair of reinforcement members, thereby applying a load acting on the member to be reinforced to the pair of reinforcement members. It is characterized by being dispersed and reduced.

  In the reinforcing structure for a steel structure according to the present invention, it is preferable that clamping is performed by clamping the engaging portion between the ends of the pair of reinforcing members and then fastening the ends with bolts and nuts.

  According to the present invention, it is possible to obtain an excellent effect that reinforcement of a steel structure such as an existing truss structure can be performed without using welding.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

Embodiment 1
1 and 2 show a reinforcing structure to which the steel structure reinforcing method according to Embodiment 1 of the present invention is applied. In addition, in FIG. 1, in order to simplify drawing and to make an understanding of a reinforcement structure easy, illustration of the steel frame and truss upper chord material of a well-known structure is abbreviate | omitted. In the figure, reference numeral 2 denotes a gusset plate provided on a steel frame not shown.

  Specifically, the first embodiment reinforces the lack of welding strength between the lattice material 1 of the truss structure, the end plate 1a and the plate 1b, and the lack of welding strength between the lattice material 1 and the truss lower chord material 4. Is done.

  Hereinafter, the reinforcing structure K will be described in detail.

  As shown in FIGS. 1 and 2, the reinforcing structure K includes an upper reinforcing member 10, 10 that is axially symmetric, and a rod-shaped lower reinforcing member (hereinafter simply referred to as “axisymmetric”) that is joined to the upper reinforcing member 10. (Referred to as a lower reinforcing member) 20 and 20 and a joining member 30 that joins the lower portion of the lower reinforcing member 20 as main components, and the lattice material 1 having insufficient strength is reinforced.

  More specifically, the reinforcing method of the present embodiment is such that the reinforcing member is axisymmetrically connected to the lattice material 1 having insufficient strength and the engaging portion (first engagement) between the lattice material 1 and the column (first main material). And the engagement portion (second engagement portion) with the truss lower chord material (second main material), and the load applied to the lattice member 1 by distributing the load to the reinforcing member. Reinforcement is made by reducing.

  Hereinafter, the upper reinforcing member 10, the lower reinforcing member 20, and the joining member 30 will be described with reference to FIGS.

  Specifically, the upper reinforcing member 10 is an L-shaped member. As shown in FIG. 3, the L-shaped member 10 is reinforced by reinforcing ribs 13 for securing the strength of the horizontal piece 11. In the illustrated example, one reinforcing rib 13 is provided at the center, but the number of reinforcing ribs 13 is appropriately determined according to the required strength.

  The width of the vertical piece 12 of the L-shaped member 10 is such that the horizontal piece 11 faces outward and the bolt / nut fastening portion (first engagement portion) with the gusset plate 2 of the lattice material 1 is sandwiched. The end portion is protruded with a predetermined width from the fastening portion so that the end portion is joined with a bolt and nut, and a bolt hole is appropriately provided at the protruding portion. In addition, when the front-end | tip part of the vertical piece 12 interferes with the truss upper chord material 3 etc., it shall cut out suitably so that interference may be avoided.

  A guide 14 for aligning the L-shaped member 10 in the direction of the plate 1 b, that is, the axial direction of the lattice material 1 is disposed on the outer peripheral portion of the opposing surface of the vertical piece 12. In this case, in order to make the direction of the reinforcing members 10 and 20 coincide with the axial direction of the lattice material 1 with high accuracy, the upper guide 14 is preferably disposed so as to contact the upper end of the plate 1b. Further, by bringing the plate 1 b into contact with the upper guide 14, the load dispersed in the reinforcing member can be transmitted to the gusset plate 2 via the upper guide 14.

  Further, the vertical piece 12 has a through hole so that the opposing surface can come into contact with the plate 1b of the lattice material 1 while avoiding interference with the bolt or nut of the bolt / nut fastening portion with the gusset plate 2 of the lattice material 1. Bolts and nut reliefs are formed.

  On the other hand, the width of the horizontal piece 11 of the L-shaped member 10 is such that the tip protrudes from the outer edge of the end plate 1a of the lattice material 1 by a predetermined distance in a state where the bolt / nut fastening portion with the gusset plate 2 of the lattice material 1 is sandwiched. And a bolt hole is appropriately provided in the protruding portion.

  The lower reinforcing member 20 is not clearly shown, but a fastening portion (second engaging portion) between the flange 21 joined to the horizontal piece 11 of the upper reinforcing member 10 and the truss lower chord member 4 of the lattice material 1. ), A top rod 23 having an upper joint 23a joined to the flange 21 at the upper end, and a lower rod 24 having a lower connector 24a joined to the reinforcement side plate 22 at the lower end, It has a turnbuckle (not shown) that is screwed onto the lower end of the upper rod 23 and the upper end of the lower rod 24.

  As shown in the figure, the flange 21 is appropriately cut out at a portion that interferes with the lattice material 1. Note that the connection between the flange 21 and the upper joint 23a is made by welding the connection piece 21a suspended from the back surface of the flange 21 and the upper joint 23a.

  As illustrated, the reinforcing side plate 22 has a rectangular shape corresponding to the fastening portion of the lattice material 1 with the truss lower chord material 4, and the side located on the lattice material 1 to be reinforced is an inclined portion along the lattice material 1. The deformed rectangular plate is formed. As for the width (length in the vertical direction) of the rectangular portion, each of the lower side and the upper side protrudes from the truss lower chord member 4 with a predetermined width, and a bolt hole is appropriately provided in the protruding portion. The connection between the reinforcing side plate 22 and the lower connection tool 24a is made by welding the lower connection tool 24a to the connection piece 22a provided at the tip of the inclined portion of the reinforcement side plate 22.

  The joining member 30 is disposed on the back side of the truss lower chord member 4 and the pair of upper joining members 31 and 32 that are arranged with the bundle member 5 interposed therebetween and join the upper side of the lower reinforcing member 20, that is, the upper side of the reinforcing side plate 22. A lower joint member 33 that is disposed and joins the lower lower side of the lower reinforcing member 20, that is, the lower side of the reinforcing side plate 22, is included. The reinforcing side plates 22 and 22 are joined by the upper joining members 31 and 32 and the lower joining member 33 with the truss lower chord material 4 sandwiched therebetween, whereby the lower reinforcing members 20 and 20 are engaged with the truss lower chord material 4. .

  The upper joining members 31 and 32 are formed in an upward U-shaped body, and the width thereof is adjusted so as to be fitted between the reinforcing side plates 22 and 22, and corresponds to the bolt holes provided in the upper protrusions of the reinforcing side plates 22. Bolt holes are provided. Further, the upper joint members 31, 32, that is, the end portions that interfere with the U-shaped bundle 5 are cut out in an arc shape, while the end portions that interfere with the lattice material 1 are cut out in an elliptical arc shape.

  The lower joining member 33 is a downward U-shaped body, and its width is adjusted so that it can be fitted between the reinforcing side plates 22 and 22, and a bolt hole provided in a protruding portion on the lower side of the reinforcing side plate 22. Corresponding bolt holes are provided. Further, the lower joining member 33 is provided with a reinforcing rib 33a at an intermediate portion.

  Next, the reinforcement of the lattice material 1 by the reinforcing structure K having such a configuration will be described.

  Procedure 1: The upper reinforcing members 10, 10 that are axisymmetric are covered with the fastening portions of the lattice material 1 and the gusset plate 2, and the upper reinforcing members 10, 10 are engaged with the gusset plate 2. In other words, the vertical pieces 12 and 12 of the L-shaped members 10 and 10, which are made symmetrical with respect to the axis, are fastened with bolts and nuts between the vertical pieces 12 and 12 with the fastening portion between the lattice material 1 and the gusset plate 2 sandwiched therebetween. To be engaged with the gusset plate 2. Thereby, the upper reinforcement members 10 and 10 are engaged with the first engaging portion.

  Procedure 2: The lower reinforcing members 20 and 20 that are axially symmetric are covered with the lattice 1 of the truss lower chord member 4 and the lower reinforcing members 20 and 20 are engaged with the second engaging portion. That is, the reinforcing side plates 22 and 22 that are made symmetrical with each other are joined to each other by bolts and nuts by the upper joining members 31 and 32 and the lower joining member 33, and the joint portion of the truss lower chord member 4 with the lattice 1 is joined to the reinforcing side plate. The lower reinforcing members 20 and 20 are engaged with the truss lower chord member 4 by being sandwiched between 22 and 22.

  Step 3: Adjust the turnbuckles of the lower reinforcing members 20, 20 so that the flange 21 and the horizontal piece are in a state where the end plate 1 a of the lattice material 1 is sandwiched between the flange 21 and the horizontal piece 11 of the L-shaped member 10. 11 and bolts and nuts.

  Procedure 4: The turnbuckles of the lower reinforcing members 20 and 20 are tightened, and a predetermined tension is applied to the upper reinforcing member 10 and the lower reinforcing member 20. Thereby, reinforcement of the lattice material 1 is completed.

  Therefore, in the first embodiment, the load acting on the lattice material 1 is reduced by being distributed to the reinforcing members 10 and 20 arranged symmetrically on the lattice material 1, so that the strength of the lattice material 1 is insufficient. Is resolved. That is, the lattice material 1 is reinforced.

  Thus, according to the first embodiment, the truss structure can be reinforced with bolts and nuts, that is, without welding.

Embodiment 2
The principal part of the reinforcement structure K1 which concerns on Embodiment 2 of this invention is shown in FIGS. The second embodiment is obtained by modifying the first embodiment. In the lower reinforcing member 20A, the flange 21 and the upper connector 23a are connected by bolts and nuts. . The remaining configuration of the second embodiment is the same as that of the first embodiment.

  As described above, according to the second embodiment, since the flange 21 alone can be joined to the horizontal piece 11 of the L-shaped member 10, an effect that is not obtained in the first embodiment in which workability is improved can be obtained.

  As mentioned above, although this invention has been demonstrated based on embodiment, this invention is not limited only to this embodiment, A various change is possible. For example, the present invention can be applied to reinforcement of other members of the truss structure, for example, reinforcement of a bundle member or brace member.

  The present invention can be applied to the reinforcement of steel structures that are difficult to reinforce by welding.

It is a disassembled perspective view of the upper part of the reinforcement structure which concerns on Embodiment 1 of this invention. It is a partial exploded perspective view of the lower part of the reinforcement structure of the embodiment. It is an upper part front view of the reinforcement structure. It is an arrow AA figure of FIG. It is an arrow BB figure of FIG. FIG. 4 is an arrow CC view of FIG. 3. It is a lower part front view of the reinforcement structure. FIG. 8 is a DD view of FIG. 7. FIG. 8 is an EE diagram of FIG. It is an upper part front view of the reinforcement structure which concerns on Embodiment 2 of this invention. It is arrow FF figure of FIG. It is an arrow GG figure of FIG. It is an arrow HH figure of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lattice material 1a End plate 2 Gusset plate 3 Truss upper chord material 4 Truss lower chord material 10 Upper reinforcement member, L-shaped member 11 Horizontal piece 12 Vertical piece 14 Guide 20 Rod-like lower reinforcement member 21 Flange 22 Reinforcement side plate 23 Upper rod 24 Lower part Rod 30 Joint member K Reinforcement structure

Claims (4)

It has a 1st engaging part with which the one end part of the reinforcement object member is engaged with the 1st main material, and the 2nd engagement part with which the other end part of the reinforcement object member is engaged with the 2nd main material. A method for reinforcing a steel structure,
A pair of reinforcing members are arranged symmetrically on the reinforcing object member,
Sandwiching the first engaging portion by one end of the pair of reinforcing members, and sandwiching the second engaging portion by the other end of the pair of reinforcing members,
Thereby, the load applied to the member to be reinforced is dispersed and reduced in the pair of reinforcing members, and the method for reinforcing a steel structure is characterized.   2. The method for reinforcing a steel structure according to claim 1, wherein the clamping is performed by fastening the end portions with bolts and nuts in a state where the engaging portion is sandwiched between the end portions of the pair of reinforcing members. It has a 1st engaging part with which the one end part of the reinforcement object member is engaged with the 1st main material, and the 2nd engagement part with which the other end part of the reinforcement object member is engaged with the 2nd main material. A steel structure reinforcement structure,
A pair of reinforcing members disposed symmetrically about the reinforcing object member;
Sandwiching the first engaging portion by one end of the pair of reinforcing members, and sandwiching the second engaging portion by the other end of the pair of reinforcing members,
Thereby, the load applied to the member to be reinforced is reduced by dispersing the load to the pair of reinforcing members.   4. The reinforcing structure for a steel structure according to claim 3, wherein the clamping is performed by clamping the engaging portion between the ends of the pair of reinforcing members and then fastening the ends with bolts and nuts.

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