JP6252859B2 - Structure reinforcement method and structure reinforcement structure - Google Patents

Description

  The present invention relates to a structure reinforcement method and a structure reinforcement structure.

Conventionally, as a method of improving the earthquake resistance of a building of an existing steel structure, for example, as shown in Non-Patent Document 1, a method of increasing the rigidity of a steel column by welding and joining a member such as a steel plate as a reinforcing material It has been known.
Moreover, in the existing steel structure, as shown in Patent Document 1, a reinforcing material is arranged so as to surround the outer periphery of the hollow steel column, and a curable member is provided in the gap between the steel column and the reinforcing material. A method of reinforcing a structure by providing is disclosed.

JP 2009-235817 A “Earthquake Resistance Diagnosis and Seismic Retrofit Guideline (1996) 2nd edition, supervised by Ministry of Land, Infrastructure, Transport and Tourism, Housing Bureau Building Guidance Division, Japan Building Disaster Prevention Association Issue, February 19, 2004, p. 90-91, 102-103

  By the way, the seismic reinforcement work for the existing structure is usually performed while using the structure, and it is necessary to consider the habitability of the resident of the structure at the time of construction.

  In this case, if welding is performed between the steel column having a hollow inside and the reinforcing material, it is necessary to take fire measures such as arranging fire prevention equipment in order to use fire at the construction site. If such fire countermeasures are taken, there is a problem that the construction cost increases. In addition, there are cases where curing for fire during welding cannot be sufficiently performed.

  The present invention has been made in view of the above, and a method for reinforcing a structure capable of reinforcing an existing structure having a hollow steel column without using fire, and reinforcement of the structure The purpose is to provide a structure.

  In order to solve the above-described problems and achieve the object, the method for reinforcing a structure according to the present invention is a method for reinforcing a structure in which an existing structure having a hollow steel column inside is reinforced with braces. An opening forming step of forming an opening on a side surface of the steel column; a reinforcing member is inserted into the steel column from the opening; and the reinforcing member is disposed at a predetermined position inside the side surface of the steel column. A reinforcing member disposing step; a base plate disposing step of disposing a base plate to which the brace is attached at a predetermined position outside the side surface of the steel column so as to cover the opening; the base plate and the reinforcing member; And a joining step of bolting them together.

  Further, according to one aspect of the method for reinforcing a structure of the present invention, in the opening forming step, at least three through holes are formed on a side surface of the steel column by a drill, and the through holes are connected to each other. The opening is formed by cutting a side surface of the steel column with a saw blade.

  Moreover, in one aspect of the method for reinforcing a structure of the present invention, the steel column is a square steel pipe column, and in the opening forming step, the through holes are formed at four locations by a drill, and these through holes are formed. A diamond-shaped opening is formed on the side surface of the steel column by cutting the side surface of the steel column with a saw blade so as to be tied.

  Further, the reinforcing structure of the structure of the present invention is a reinforcing structure of a structure in which an existing structure having a hollow steel column inside is reinforced by braces, from an opening formed on a side surface of the steel column. Inserted into the steel column, a reinforcing member disposed at a predetermined position inside the side surface of the steel column, and disposed at a predetermined position outside the side surface of the steel column so as to cover the opening, A base plate to which the brace is attached, wherein the base plate and the reinforcing member are bolted to each other.

  ADVANTAGE OF THE INVENTION According to this invention, the reinforcement method of the structure which can reinforce the existing structure which has a hollow steel column inside without using fire, and the reinforcement structure of a structure can be provided.

FIG. 1 is a schematic view showing an appearance of a reinforcing structure for a structure according to an embodiment of the present invention. FIG. 2 is a schematic explanatory diagram of a reinforcing structure for a structure according to an embodiment of the present invention. FIG. 3 is a schematic explanatory view showing a cross section of the reinforcing structure of the structure along the line AA in FIG. 2. FIG. 4 is a schematic explanatory diagram of the reinforcing structure of the structure as viewed from the direction B of FIG. FIG. 5 is a flow diagram of a method for reinforcing a structure according to an embodiment of the present invention. FIG. 6 is a schematic explanatory diagram of a method for reinforcing a structure according to an embodiment of the present invention. FIG. 7 is a schematic explanatory diagram of a method for reinforcing a structure according to an embodiment of the present invention.

  Hereinafter, a structure reinforcing structure and a structure reinforcing method according to an embodiment of the present invention will be described with reference to the drawings. Note that, in each drawing, the same or corresponding elements are denoted by the same reference numerals as appropriate, and repeated descriptions are omitted as appropriate. Furthermore, it should be noted that the drawings are schematic, and dimensional relationships between elements may differ from actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included.

  First, a reinforcing structure for a structure according to an embodiment of the present invention will be described. In FIG. 1, the schematic which shows the external appearance of the reinforcement structure 1 of the structure based on embodiment of this invention is shown. The structure 100 has a plurality of hollow steel columns 10 inside, and these steel columns 10 are reinforced by the reinforcing structure 1 of the structure according to the present embodiment. Specifically, the steel column 10 is provided with a plurality of base plates 30, and braces 40 are attached between the base plates 30 in a brace shape.

  The schematic explanatory drawing of the reinforcement structure 1 of the structure based on embodiment of this invention is shown to FIGS. FIG. 2 is a schematic explanatory view of a cross section in the longitudinal direction of the steel column 10 including an opening 11 to be described later in the reinforcing structure of a structure. FIG. 3 is a schematic explanatory view showing a cross section of the reinforcing structure of the structure along the line AA in FIG. FIG. 4 is a schematic explanatory diagram of the reinforcing structure of the structure viewed from the direction B of FIG.

  As shown in FIGS. 2 to 4, the reinforcing structure 1 for a structure is provided at a predetermined position inside the side surface of the steel column 10 and at a predetermined position outside the side surface of the steel column 10. The base plate 30 is provided, and an opening 11 is formed on the side surface of the steel column 10. This structure reinforcement structure 1 is intended to seismically reinforce the structure 100 for structures such as existing civil engineering and architectural buildings.

In the present embodiment, the steel column 10 is a square steel pipe column having a square cross section, and the steel column 10 is hollow inside. The steel column having a hollow inside is sometimes referred to as a column column.
The opening 11 is formed in order to insert the reinforcing member 20 into the steel column 10 during construction of the reinforcing structure 1 of the structure. In the present embodiment, as shown in FIG. 4, the opening 11 has a rhombus shape, and the apex portion of the rhombus protrudes in a round shape.

The reinforcing member 20 is provided along the inner side surface of the steel column 10 and fixed to the base plate 30 by bolting, and the steel column from one end (upper or lower end in FIG. 2) of the fixing unit 21. And a second rib 23 projecting from the surface of the fixing portion 21 toward the inside of the steel column 10 so as to be orthogonal to the first rib 22. ing. The reinforcing member 20 does not necessarily have the first rib 22, but preferably has the first rib 22. Further, the reinforcing member 20 may not have the second rib 23, and the reinforcing member 20 may have the second rib 23 as necessary.
Each fixing portion 21 is formed with three through holes through which the bolts 51 are inserted, and the base plate 30 and the reinforcing member 20 are bolted together by bolts 51 and nuts 53 (FIG. 3). reference). Further, the first rib 22 and the second rib 23 are formed to increase the rigidity of the reinforcing member 20.

  In the present embodiment, five reinforcing members 20 are provided for one base plate 30, and four of the reinforcing members 20 are steel columns so as to overlap a part of the opening 11 when viewed from the B direction. It is arrange | positioned inside 10 side surfaces. Specifically, as shown in FIG. 4, one reinforcing member 20 is disposed so as to overlap the upper or lower apex portion of the rhombus apexes of the opening 11. These reinforcing members 20 are for increasing the strength of the steel column 10.

  The base plate 30 includes a base portion 31 provided along the outer side of the side surface of the steel column 10, a brace attachment portion 32 extending in the orthogonal direction from the surface of the base portion 31 toward the outer side of the steel column 10, and one end of the base portion 31. And the ribs 33 and 34 which protrude toward the outer side of the steel column 10 from the other end (upper end and lower end in FIG. 2) are provided. The base portion 31 of the base plate 30 is disposed so as to cover the opening 11. In addition, in FIG. 4, illustration of the brace attaching part 32 and the ribs 33 and 34 is abbreviate | omitted.

  In the present embodiment, the reinforcing member 20 and the base plate 30 are disposed to face each other with the side surface of the steel column 10 interposed therebetween, and the reinforcing member 20 and the base plate 30 are joined by the bolt 51 and the nut 53 as described above. Further, the brace 40 is attached to the brace attaching portion 32 by being joined by a bolt 52.

Next, a method for reinforcing a structure according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7 are schematic explanatory views of a method for reinforcing a structure in a longitudinal section of a steel column, and the right diagrams in FIGS. 6 and 7 are structures viewed from the side of the steel column. It is a schematic explanatory drawing of the reinforcement method of an object.
For example, as shown in FIG. 5, the structure reinforcing method includes an opening forming step S1, a reinforcing member disposing step S2, a base plate disposing step S3, a bolt joining step S4, and a brace attaching step S5. ing.
Below, each process of the reinforcement method of a structure is demonstrated in detail.

(Opening formation step S1)
First, a through hole 61 is formed by a drill at a predetermined position of a steel column 10 that is a hollow square steel tube column. In the present embodiment, as shown in FIG. 6, a through hole 61 is formed on the side surface of the steel column 10 at the position of the apex of the rhombus.
Next, a Saber saw blade is inserted into the through hole 61 described above, and the side surface of the steel column 10 is cut so that the through holes 61 are connected to each other, thereby forming the opening 11. Specifically, the broken line portion 62 shown in FIG. 6 is cut with a Saber saw to form the diamond-shaped opening 11. Here, two openings 11 are formed in one base plate 30.

(Reinforcing member disposing step S2)
Next, the reinforcing member 20 is inserted into the steel column 10 from the opening 11, and the reinforcing member 20 is disposed at a predetermined position inside the side surface of the steel column 10. In the present embodiment, as shown in FIG. 7, four reinforcing members 20 are arranged so as to overlap the upper or lower vertex of the rhombus apex of the opening 11, and further, between the reinforcing members 20 a and 20 a. Also, one reinforcing member 20 is arranged. Here, for example, a through-hole for bolt connection is formed in advance at a predetermined position on the side surface of the steel column 10, and from the inside of the steel column 10, the bolt connection is formed in the fixing portion 21 of the reinforcing member 20. The reinforcing member 20 may be temporarily fixed to the inside of the side surface of the steel column 10 by inserting a bolt 51 through the through hole and a through hole for bolt connection of the steel column 10 and using a crosspiece or the like.

(Base plate placement step S3, bolt joining step S4)
Next, the base plate 30 is disposed at a predetermined position outside the side surface of the steel column 10. In this embodiment, as shown in FIG. 7, the bolt 51 is inserted into the through hole of the base plate 30, the base plate 30 is disposed at a position facing the reinforcing member 20, and the nut 53 is tightened to tighten the reinforcing member 20. The base plate 30 is bolted. In this way, the reinforcing member 20 and the base plate 30 are attached to predetermined positions of the steel column 10. In addition, in the figure on the right side of FIG. 7, illustration of the brace attaching part 32 and the ribs 33 and 34 is omitted.

(Brace mounting process S5)
The brace 40 is joined to the brace attaching part 32 of each base plate 30 with the bolt 52, and the brace 40 is attached between the steel pillars 10 in a brace shape.
As described above, the structure reinforcing method according to the present embodiment is completed.

  In the reinforcing structure 1 for a structure according to the present embodiment configured as described above, the through hole 61 is formed by a drill at the position of the apex of the rhombus, and the steel frame is connected so that the through hole 61 is connected by a saw blade. The side surface of the column 10 is cut to form the opening 11. The reinforcing member 20 is inserted into the steel column 10 from the opening 11 and the reinforcing member 20 and the base plate 30 are joined by bolts 51. Therefore, in the reinforcement structure 1 of a structure, construction can be performed without using fire such as welding. In addition, since no countermeasures against fire are required, there is no increase in cost due to fire countermeasures.

  Moreover, since the base plate 30 can be joined to the steel column 10 without performing welding, it can be avoided that the existing steel column 10 is affected by heat during welding. That is, the base plate 30 can be joined to the steel column 10 without the steel column 10 being deteriorated by heat.

Further, since the reinforcing structure 1 of the structure is configured such that the reinforcing member 20 and the base plate 30 are bolted together, the rigidity of the steel column 10 in which the opening 11 is formed can be increased. Also, the joining strength can be increased by joining the reinforcing member 20 and the base plate 30 with the bolts 51.
Furthermore, in this embodiment, since the five reinforcing members 20 are disposed for each base plate 30, the rigidity is further improved.

  Moreover, in this embodiment, since the shape of the opening part 11 is a rhombus shape, when inserting the reinforcement member 20, the reinforcement member 20 can be easily inserted in the inside of the steel column 10, and construction is possible. Improves.

  Note that the present invention is not limited to the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, in the above embodiment, the case where the bolt 51 is inserted from the inside of the steel column 10 into the bolt through hole of the reinforcing member 20 and the reinforcing member 20 and the base plate 30 are joined by the bolt 51 has been described. It is good also as a structure which arrange | positions a member and a base plate in a predetermined position, and bolts a reinforcement member and a base plate using a one side bolt.

  Moreover, in said embodiment, about the case where four through-holes 61 are formed in the side surface of the steel column 10, and the opening part 11 is formed by cut | disconnecting a side surface with a saw blade so that the through-hole 61 may be tied. As described above, after forming at least three through holes on the side surface of the steel column 10, the side surface of the steel column may be cut with a saw blade so that these through holes are connected. Also in this case, an opening can be formed and a reinforcing member can be inserted into the steel column.

DESCRIPTION OF SYMBOLS 1 Structure reinforcement structure 10 Steel column 11 Opening part 20 Reinforcement member 21 Fixing part 22 First rib 23 Second rib 30 Base plate 31 Base part 32 Brace attachment part 33, 34 Rib 40 Brace 51, 52 Bolt 53 Nut 61 Through-hole 62 Broken line portion 100 Structure

Claims (4)

A method of reinforcing a structure in which an existing structure having a hollow steel column inside is reinforced by braces,
An opening forming step of forming an opening on a side surface of the steel column;
A reinforcing member disposing step of inserting a reinforcing member into the inside of the steel column from the opening and disposing the reinforcing member at a predetermined position inside the side surface of the steel column;
A base plate disposing step of disposing a base plate to which the brace is attached at a predetermined position outside the side surface of the steel column so as to cover the opening;
A method for reinforcing a structure, comprising: a joining step of bolting the base plate and the reinforcing member to each other.   In the opening forming step, at least three through holes are formed in the side surface of the steel column with a drill, and the side surface of the steel column is cut with a saw blade so that the through holes are connected, thereby the opening is formed. The method for reinforcing a structure according to claim 1, wherein a portion is formed. The steel column is a square steel pipe column,
In the opening forming step, the through-hole is formed at four locations by a drill, and the side surface of the steel column is cut by a saw blade so that the through-holes are connected, thereby forming a rhombus on the side surface of the steel column. The method for reinforcing a structure according to claim 2, wherein an opening is formed. An existing structure having a hollow steel column inside is a reinforcing structure of a structure reinforced by braces,
A reinforcing member inserted into the inside of the steel column from an opening formed on the side surface of the steel column, and disposed at a predetermined position inside the side surface of the steel column;
A base plate that is disposed so as to cover the opening at a predetermined position outside the side surface of the steel column and to which the brace is attached;
A reinforcing structure for a structure, wherein the base plate and the reinforcing member are bolted to each other.

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