JP2007132011A - Reinforcing method for existing steel structure - Google Patents

Reinforcing method for existing steel structure Download PDF

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JP2007132011A
JP2007132011A JP2005323412A JP2005323412A JP2007132011A JP 2007132011 A JP2007132011 A JP 2007132011A JP 2005323412 A JP2005323412 A JP 2005323412A JP 2005323412 A JP2005323412 A JP 2005323412A JP 2007132011 A JP2007132011 A JP 2007132011A
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steel material
reinforcing
existing
steel
reinforcing steel
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JP4656516B2 (en
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Takashi Miyama
剛史 三山
Takashi Asano
孝 浅野
Daisuke Katsura
大輔 桂
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Fujita Corp
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Fujita Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of reinforcing an existing steel structure by mounting a reinforcing steel member to an existing steel member constituting the existing steel structure while overcoming problems incidental to a conventional reinforcing method by suitably coping with even the case of using the reinforcing steel member thick in plate thickness and large in applied load. <P>SOLUTION: A prepared hole 22 for a driving rivet 24 is formed in the reinforcing steel member 20 formed of band steel or the like, and a counter sunk part 28 is formed in the prepared hole 22. The driving rivet 24 is driven through the prepared hole 22 to fix the reinforcing steel member 20 to the existing steel member 28. A surface swelling part 18b of the existing steel member 18 formed at the driven part of the driving rivet 24 is settled into the counter sunk part 28 of the reinforcing steel member 20. The reinforcing steel member 20 is thereby brought into close contact with the existing steel member 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、既存鋼製構造物の補強方法に関し、より詳しくは、既存鋼製構造物を構成している既存鋼材に補強鋼材を取付けて当該既存鋼製構造物を補強する方法に関する。   The present invention relates to a method for reinforcing an existing steel structure, and more particularly, to a method for reinforcing a conventional steel structure by attaching a reinforcing steel material to an existing steel material constituting the existing steel structure.

既存鋼製構造物に補強を施すことを要する場合としては、例えば、経年変化により強度が低下した既存鋼製構造物に補強を施す場合、それに、耐震性能が不十分な既存鋼製構造物に耐震補強を施す場合などがある。また、ここでいう鋼製構造物とは、例えば、鉄骨造建物の骨組や、鉄塔、鉄柱、それに様々な構造物を支持するための鋼製支持構造体などをはじめとする、鋼材を用いて構成された様々な構造物である。既存鋼製構造物を構成している既存鋼材に補強鋼材を取付けてその既存鋼製構造物を補強する補強方法は、一般的に広く採用されており、既存鋼材に補強鋼材を取付ける手段としては、溶接、ボルト及びナットによる締結、それに鋲による固定などの様々な手段が用いられている。   When it is necessary to reinforce an existing steel structure, for example, when reinforcing an existing steel structure whose strength has decreased due to secular change, an existing steel structure with insufficient seismic performance There are cases where seismic reinforcement is applied. In addition, the steel structure referred to here is a steel structure including, for example, a framework of a steel structure building, a steel tower, a steel pillar, and a steel support structure for supporting various structures. There are various structures constructed. Reinforcement methods to reinforce existing steel structures by attaching reinforcing steel materials to existing steel structures that make up existing steel structures are generally widely adopted, and as a means to attach reinforcing steel materials to existing steel materials Various means such as welding, fastening with bolts and nuts, and fixing with scissors are used.

それら取付手段のうち、溶接法は広く用いられている手段であるが、溶接作業は火気を伴うため、溶接養生が必要とされ、また特に、補強を施そうとする既存鋼製構造物が、火気を嫌う内装材を用いて内装が施された鉄骨造建物の骨組である場合などには、火気の使用に大きな制約が課される。加えて、大重量の溶接機を現場に搬出入する面倒もあり、また何よりも、溶接後の残留応力が問題となることが多々ある。溶接法によって既存鋼製構造物の既存鋼材に補強鋼材を取付けると、熱膨張及び冷却の過程で、既存鋼材と補強鋼材との双方に残留応力が発生し、この残留応力は多くの場合、既存鋼製構造物全体の耐震性を下げる方向に作用する。しかも、溶接後に残留応力が発生しないようにすることは、通常、極めて困難である。   Among these attachment means, the welding method is a widely used means, but since the welding work involves fire, welding curing is required, and in particular, existing steel structures to be reinforced are In the case of a framework of a steel building that is decorated with interior materials that dislike fire, there are significant restrictions on the use of fire. In addition, there is also the trouble of carrying in and out of heavy welding machines, and above all, residual stress after welding is often a problem. When a reinforcing steel is attached to an existing steel structure of an existing steel structure by the welding method, residual stress is generated in both the existing steel and the reinforcing steel during the process of thermal expansion and cooling. Acts in the direction of lowering the earthquake resistance of the entire steel structure. Moreover, it is usually very difficult to prevent residual stress from being generated after welding.

ボルト及びナットにより締結する方法を用いる場合には、既存鋼材と補強鋼材との双方に、予めボルト穴を形成しておく必要がある。そして、既存鋼材側のボルト穴間のピッチとそれに対応した補強鋼材側のボルト穴間のピッチとが一致していなければならないが、それらが一致するように、十分に高い位置精度でボルト穴を形成するには、それなりの手間及びコストを要し、特に、既存鋼材と補強鋼材とを互いに固定する箇所が多数に及ぶ場合などには、作業速度及び施工コストの点で大きな不利を生じる。   When using the method of fastening with bolts and nuts, it is necessary to form bolt holes in advance in both the existing steel material and the reinforcing steel material. The pitch between the bolt holes on the existing steel material side and the corresponding pitch between the bolt holes on the reinforced steel side must match, but the bolt holes should be positioned with sufficiently high positional accuracy so that they match. Forming requires considerable labor and cost. In particular, when there are many places where the existing steel material and the reinforcing steel material are fixed to each other, there is a great disadvantage in terms of working speed and construction cost.

既存鋼材と補強鋼材との双方に鋲穴(リベット穴)を形成し、そこに挿通した鋲(リベット)の先端をかしめて固定する方法では、ボルト及びナットにより締結する方法と同様の不利を生じることになる。ただし、鋲によって固定するにしても、これとは別の方法があり、それは、あたかも木材に釘を打込むときのように、鋲穴を形成していない鋼材に、先端が鋭く尖った打込み鋲を鋲打機を用いて直接打込む打鋲法である。この打鋲法を施工するための鋲打機として、簡便に使用することのできる、手持式の鋲打機が市販されており、その種の鋲打機は例えば特開平11−245176号公報などにも記載されている。また、特開2005−16243号公報には、その種の打込み鋲を用いて、厚さが1.6mmを超えるALCパネル取付用下地鋼材を鉄骨躯体の柱または梁に固定する取付構造が記載されている。同公報のALCパネル取付用下地鋼材の取付構造は、ALCパネル取付用下地鋼材と、鉄骨躯体の柱または梁とのいずれにも、下穴を形成するなどの加工を一切施すことなく、軸部に金属製や硬質の樹脂製の円盤状ストッパー部材を有する発射打込み鋲により、ALCパネル取付用下地鋼材を隙間なく固定するようにしたものである。   The method of forming a rivet hole (rivet hole) in both the existing steel material and the reinforcing steel material and caulking and fixing the tip of the rivet (rivet) inserted therethrough has the same disadvantage as the method of fastening with bolts and nuts. It will be. However, there is another method for fixing with a scissors, such as a hammer that has a sharp point on a steel material that does not have a spear hole as if a nail is driven into the wood. Is a direct driving method using a hammer. As a nailing machine for constructing this nailing method, a hand-held nailing machine that can be used easily is commercially available, and such a nailing machine is disclosed in, for example, Japanese Patent Laid-Open No. 11-245176. It is also described in. Japanese Patent Application Laid-Open No. 2005-16243 describes a mounting structure for fixing an ALC panel mounting base steel material having a thickness exceeding 1.6 mm to a column or beam of a steel frame using such a driving rod. ing. The mounting structure of the ALC panel mounting base steel material of the same publication is the shaft part without any processing such as forming a pilot hole in either the ALC panel mounting base steel material and the column or beam of the steel frame. The base steel material for mounting the ALC panel is fixed without a gap by a launching rod having a disk-like stopper member made of metal or hard resin.

特開平11−245176号公報JP-A-11-245176 特開2005−16243号公報Japanese Patent Laying-Open No. 2005-16243

特開2005−16243号公報に記載されている取付構造は、ALCパネル取付用下地鋼材を取付けるための構造であるため、ALCパネル取付用下地鋼材のように、板厚が比較的小さく、加わる荷重もさほど大きくない板状の鋼材を取付けるには十分であるが、例えば建物の耐震補強のための補強鋼材などのように、ALCパネル取付用下地鋼材と比べて板厚が大きく、加わる荷重も大きな鋼材を取付けるのには不適当である。従って本発明の目的は、板厚が大きく、加わる荷重も大きな補強鋼材を用いる場合にも好適に対応することができ、且つ、上述した従来の補強方法に付随する問題を克服した、既存鋼製構造物を構成している既存鋼材に補強鋼材を取付けて当該既存鋼製構造物を補強する方法を提供することにある。   Since the mounting structure described in Japanese Patent Application Laid-Open No. 2005-16243 is a structure for mounting the ALC panel mounting base steel, the plate thickness is relatively small and the applied load is similar to the ALC panel mounting base steel. Although it is enough to attach a plate-shaped steel material that is not so large, the plate thickness is larger than the base steel material for ALC panel mounting, such as a reinforcing steel material for seismic reinforcement of buildings, and the applied load is also large It is not suitable for mounting steel materials. Therefore, the object of the present invention is to make it possible to suitably cope with the case of using a reinforcing steel material having a large plate thickness and a large applied load, and overcoming the problems associated with the above-described conventional reinforcing method. An object of the present invention is to provide a method for reinforcing an existing steel structure by attaching a reinforcing steel material to an existing steel material constituting the structure.

かかる目的を達成するため、本発明に係る既存鋼製構造物の補強方法は、既存鋼製構造物を構成している既存鋼材に補強鋼材を取付けて当該既存鋼製構造物を補強する方法において、打込み鋲の軸部の長さより小さい板厚を有する帯鋼または形鋼から成り、既存鋼材の表面に当接させる当接面を有し、打込み鋲の軸部を挿通するための貫通穴である下穴が前記当接面に開口しており、前記下穴の前記当接面側の開口部に座繰り部が形成されている補強鋼材を製作するステップと、前記補強鋼材の前記当接面を前記既存鋼材の表面に当接させて、前記補強鋼材を前記既存鋼材に仮止めするステップと、前記下穴を通して前記既存鋼材に打込み鋲を打込むことにより前記補強鋼材を前記既存鋼材に固定するステップとを含み、前記既存鋼材の前記打込み鋲が打込まれた箇所に形成される前記既存鋼材の表面膨出部が前記補強鋼材の前記座繰り部に収まるようにしたことを特徴とする。   In order to achieve such an object, a method for reinforcing an existing steel structure according to the present invention is a method of reinforcing a steel structure by attaching a reinforcing steel material to an existing steel material constituting the existing steel structure. A through hole for inserting the shaft portion of the driving rod, which is made of a steel strip or a shape steel having a plate thickness smaller than the length of the shaft portion of the driving rod, has an abutting surface to be brought into contact with the surface of the existing steel material A step of producing a reinforcing steel material in which a prepared hole is opened in the contact surface, and a countersink portion is formed in an opening portion of the prepared hole on the contact surface side; and the contact of the reinforcing steel material A step of bringing a surface into contact with the surface of the existing steel material, temporarily fixing the reinforcing steel material to the existing steel material, and driving the reinforcing steel material into the existing steel material by driving a hammer into the existing steel material through the pilot hole Fixing the existing steel material Wherein the surface bulging portion of the existing steel write studs are formed on the implanted portion is fit on the spot facing portion of the reinforcing steel.

本発明に係る既存鋼製構造物の補強方法によれば、補強鋼材の下穴を通して既存鋼材に打込む打込み鋲によって、補強鋼材を既存鋼材にしっかりと密接させて固定することができる。また、溶接法、ボルト及びナットによる締結法、それに、鋲孔に挿通した鋲の先端をかしめる方法などに付随する上述した不都合がなく、しかも、板厚が大きく、加わる荷重も大きな補強鋼材を用いる場合にも好適に対応することができる。   According to the method for reinforcing an existing steel structure according to the present invention, the reinforcing steel material can be fixed in close contact with the existing steel material by a driving rod that is driven into the existing steel material through the prepared hole of the reinforcing steel material. Further, there is no above-mentioned inconvenience associated with the welding method, the fastening method with bolts and nuts, and the method of caulking the tip of the rod inserted into the hole, and a reinforcing steel material having a large plate thickness and a large load is used. It can respond suitably also when using.

以下に添付図面を参照しつつ、本発明の具体的な実施の形態について詳細に説明して行く。図1の(A)及び(B)は、本発明に係る既存鋼製構造物の補強方法を用いて補強を施した鋼製構造物の具体例を示した図であり、夫々、鋼材を組合せて構成した鉄柱の側面図及び断面平面図である。   Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. (A) and (B) of Drawing 1 are figures showing the example of the steel structure reinforced using the reinforcement method of the existing steel structure concerning the present invention, respectively, combining steel materials, respectively It is the side view and cross-sectional top view of the iron pillar comprised.

図1に示した鉄柱10は、鉄骨造建物の柱であり、鋼材を組合せて構成されている。鉄柱10の下端には鋼板製のベースプレート12が溶接されており、鉄柱10の上端には柱梁接合部16を介して、同様に鋼材を組合せて構成された大梁15が連結されている。鉄柱10は、等辺山形鋼から成る4本の主鋼材18を並列にして鉛直に延在させ、帯鋼から成る連結斜材17を介してそれら主鋼材18を相互に連結することで、全体としてトラス構造となるように構成したものである。図1(B)から明らかなように、それら4本の主鋼材18は2本ずつが対とされており、各対の主鋼材18に対して、1本ずつの、帯鋼から成る補強鋼材20が取付けられている。従って、鉄柱10は、合計2本の補強鋼材20を取付けることで補強がなされている。それら補強鋼材20は、鉄柱10を備えた鉄骨造建物が竣工した時点では主鋼材18に取付けられておらず、築後時間を経て既存鉄骨構造物となったその鉄骨造建物を補強するために、本発明の補強方法に従って、既存鋼材である主鋼材18に取付けられたものである。   The iron pillar 10 shown in FIG. 1 is a pillar of a steel structure building, and is comprised combining steel materials. A steel plate base plate 12 is welded to the lower end of the iron column 10, and a large beam 15 similarly configured by combining steel materials is connected to the upper end of the iron column 10 via a column beam joint 16. The iron pillar 10 has four main steel members 18 made of equilateral mountain-shaped steels extending in parallel and vertically connected to each other via a connecting diagonal member 17 made of a steel strip. It is configured to have a truss structure. As is apparent from FIG. 1B, two of the four main steel members 18 are paired, and one reinforcing steel member made of a strip steel is provided for each pair of main steel members 18. 20 is attached. Therefore, the iron pillar 10 is reinforced by attaching a total of two reinforcing steel materials 20. These reinforcing steel members 20 are not attached to the main steel member 18 at the time of completion of the steel building provided with the steel pillars 10, and are used to reinforce the steel building that has become an existing steel structure over time after construction. In accordance with the reinforcing method of the present invention, the main steel material 18 which is an existing steel material is attached.

図1(A)からも明らかなように、主鋼材18は長尺鋼材であり、一方、補強鋼材20は、この主鋼材18の長手方向に沿わせてこの主鋼材18に取付けるようにした長尺鋼材である。このように、長尺の既存鋼材に長尺の補強鋼材を取付ける場合には、先に述べた従来の方法を用いると、特に問題が生じやすいのであるが、本発明の方法を用いることによって、非常に好適な結果が得られる。   As is clear from FIG. 1A, the main steel material 18 is a long steel material, while the reinforcing steel material 20 is attached to the main steel material 18 along the longitudinal direction of the main steel material 18. It is a scale steel material. In this way, when attaching a long reinforcing steel material to a long existing steel material, using the conventional method described above is particularly likely to cause problems, but by using the method of the present invention, Very good results are obtained.

長尺鋼材である補強鋼材20には、その長手方向に複数の下穴22(図2参照)が列設されている。そして、それら下穴22を通して主鋼材18に打込み鋲24を打込むことによって、補強鋼材20を主鋼材18に固定するようにしており、それについて以下に説明する。   A plurality of pilot holes 22 (see FIG. 2) are arranged in the longitudinal direction of the reinforcing steel material 20 which is a long steel material. Then, the reinforcing steel material 20 is fixed to the main steel material 18 by driving a driving rod 24 into the main steel material 18 through the pilot holes 22, which will be described below.

図2に示したように、打込み鋲24は、軸部24aと頭部24bとを有し、先端が鋭く尖った鋲であり、エア式打鋲機、ガス式打鋲機、或いは火薬式打鋲機などを用いて打込むことによって、下穴を空けていない鋼材にも、あたかも木材に釘を打込むように打込むことができる鋲である。本発明においては、下穴22は補強鋼材20にのみ形成しておき、既存鋼材である主鋼材18には下穴を形成せず、適当な打鋲機を用いて打込み鋲24を主鋼材18に打込むようにしている。   As shown in FIG. 2, the driving rod 24 has a shaft portion 24a and a head portion 24b, and has a sharp pointed tip, and is an air-type driving device, a gas-type driving device, or an explosive-type driving device. By driving using a scissor or the like, it is possible to drive a steel material that does not have a pilot hole as if it were driving a nail into the wood. In the present invention, the pilot hole 22 is formed only in the reinforcing steel material 20, the pilot steel is not formed in the main steel material 18 that is an existing steel material, and the driving rod 24 is formed by using an appropriate hammering machine. I'm trying to get into it.

より詳しくは、補強鋼材20は、打込み鋲24の軸部の長さより小さい板厚tを有する帯鋼または形鋼から成り、主鋼材18の表面18aに当接させる当接面20aを有する。打込み鋲24の軸部24aを挿通するための貫通穴である下穴22は、この当接面20aに開口しており、この下穴22の当接面20a側の開口部に、座繰り部28が形成されている。   More specifically, the reinforcing steel material 20 is made of a steel strip or a shape steel having a plate thickness t smaller than the length of the shaft portion of the driving rod 24 and has a contact surface 20 a that contacts the surface 18 a of the main steel material 18. A pilot hole 22, which is a through hole for inserting the shaft portion 24 a of the driving rod 24, is open to the contact surface 20 a, and a countersink portion is formed on the contact surface 20 a side of the pilot hole 22. 28 is formed.

主鋼材18へ打込まれる打込み鋲24は、主鋼材18の母材を押し除けて主鋼材18へ貫入する。そのため、主鋼材18の打込み鋲24が打込まれた箇所には、打込み鋲24の先端が貫入して行く側と突き抜けて出る側との両方に、表面膨出部18bが形成される。もし仮に、補強鋼材20の下穴22に座繰り部28が形成されていなかったならば、打込み鋲24が貫入して行く側に形成される表面膨出部14bのために、補強鋼材20の当接面20aが主鋼材18の表面18aから浮き上がってしまい、その結果、補強鋼材20と主鋼材18とが密接しないことによって、補強効果が損なわれることになる。本発明において、補強鋼材20の下穴22に形成した座繰り部28は、主鋼材18の打込み鋲24が打込まれた箇所に形成される主鋼材18の表面膨出部18bがこの座繰り部28に収まるようにすることで、補強鋼材20と主鋼材18とを確実に密接させるためのものである。これによって、意図した補強効果を確実に実現することができる。   The driving bar 24 to be driven into the main steel material 18 pushes away the base material of the main steel material 18 and penetrates into the main steel material 18. Therefore, the surface bulging part 18b is formed in the location where the driving rod 24 of the main steel material 18 is driven, on both the side where the tip of the driving rod 24 penetrates and the side where it penetrates. If the counterbore portion 28 is not formed in the pilot hole 22 of the reinforcing steel material 20, the surface of the reinforcing steel material 20 is formed by the surface bulging portion 14b formed on the side through which the driving rod 24 penetrates. The contact surface 20a is lifted from the surface 18a of the main steel material 18. As a result, the reinforcing steel material 20 and the main steel material 18 are not in close contact with each other, so that the reinforcing effect is impaired. In the present invention, the counterbore portion 28 formed in the pilot hole 22 of the reinforcing steel material 20 is the surface bulge portion 18b of the main steel material 18 formed at the place where the driving rod 24 of the main steel material 18 is driven. By making it fit in the portion 28, the reinforcing steel material 20 and the main steel material 18 are brought into intimate contact with each other. As a result, the intended reinforcing effect can be reliably realized.

鉄柱10の主鋼材18に取付けられた補強鋼材20は、図1(A)に示したように、ベースプレート12から柱梁接合部16の下端までに亘って延在している。柱梁接合部16の内部には、別の補強鋼材20’が取付けられている。従って、鉄柱10の主鋼材18に取付けられた補強鋼材20は、ベースプレート12から柱梁接合部16までの長さを有するものである。ただし、補強鋼材20は、工場においてこの長さの1本ものの部材として製作するのではなく、製作及び運搬に適した適当な長さの補強鋼材セグメントを工場で大量生産し、現場において複数の補強鋼材セグメントを接合して補強鋼材20を構成することにより、全体としての施工コストを低減することができる。そのため図示した実施の形態では、現場において端部どうしを互いに突き合わせて接合することにより補強鋼材20を構成するための適当な長さの複数の補強鋼材セグメント32を、工場で製作するようにしている。また、ここでいう適当な長さとは、補強鋼材セグメント32の製作及び運搬に適した長さであり、例えば、50cm、1m、或いは2mなどの長さである。   The reinforcing steel material 20 attached to the main steel material 18 of the iron pillar 10 extends from the base plate 12 to the lower end of the column beam joint 16 as shown in FIG. Another reinforcing steel material 20 ′ is attached inside the beam-column joint 16. Therefore, the reinforcing steel material 20 attached to the main steel material 18 of the iron pillar 10 has a length from the base plate 12 to the column beam joint 16. However, the reinforced steel material 20 is not manufactured as a single member of this length in the factory, but a reinforced steel material segment having an appropriate length suitable for manufacture and transportation is mass-produced in the factory, and a plurality of reinforcements are produced on site. By constructing the reinforcing steel material 20 by joining the steel material segments, the construction cost as a whole can be reduced. For this reason, in the illustrated embodiment, a plurality of reinforcing steel material segments 32 having an appropriate length for constituting the reinforcing steel material 20 are formed at a factory by abutting and joining the end portions to each other at the site. . Further, the appropriate length here is a length suitable for the production and transportation of the reinforcing steel material segment 32, for example, a length of 50 cm, 1 m, or 2 m.

工場において補強鋼材セグメント32を製作するには、補強鋼材20の材料として使用する帯鋼または形鋼を適当な長さに切断したブランクに、複数の下穴22を長手方向に列設して形成し、更に、それら下穴22の各々に、図2に示したような座繰り部28を形成する。また更に、もし現場において補強鋼材セグメント32の突き合わせた端部どうしを接合する方法として溶接法を用いるのであれば、そのブランクの両端に突き合わせ溶接のための開先を形成することで、補強鋼材セグメント32が完成する。一方、突き合わせた端部どうしを接合する方法として、図3の(A)及び(B)に平面図及び側面図で示したように、当て金を34を使用してボルト36により接合するのであれば、そのブランクの両端にネジ穴38を形成することで、補強鋼材セグメント32が完成する。   In order to manufacture the reinforcing steel material segment 32 in the factory, a plurality of pilot holes 22 are formed in a longitudinal direction on a blank obtained by cutting a strip steel or a shape steel used as a material of the reinforcing steel material 20 into an appropriate length. Further, a counterbore 28 as shown in FIG. 2 is formed in each of the pilot holes 22. Furthermore, if a welding method is used as a method for joining the butted ends of the reinforcing steel segment 32 in the field, the reinforcing steel segment can be formed by forming a groove for butt welding at both ends of the blank. 32 is completed. On the other hand, as a method of joining the abutted end portions, as shown in the plan view and the side view in FIGS. For example, the reinforcing steel material segment 32 is completed by forming the screw holes 38 at both ends of the blank.

補強鋼材セグメント32を現場へ搬入したならば、複数の補強鋼材セグメント32を、それらの端部どうしを突き合わせた状態で主鋼材18に仮止めし、この仮止めは例えばクランプなどを用いて行えばよい。そして、仮止めされた複数の補強鋼材セグメント32の端部どうしを接合することにより、補強鋼材20を構成する。その際の手順は、以下に説明する具体例のように、主鋼材18上において、複数の補強鋼材セグメント32を、それらの端部どうしを突き合わせて接合して順次継ぎ足すことにより、補強鋼材20を構成する手順とすることが特に好ましい。また、こうして構成された補強鋼材20は、その一部を主鋼材18に溶接して固定するようにし、通常は一端または両端のみを溶接により主鋼材18に固定するが、必要に応じて更に中間部分も主鋼材18に固定することもある。   If the reinforcing steel material segment 32 is carried into the site, the plurality of reinforcing steel material segments 32 are temporarily fixed to the main steel material 18 in a state where their end portions are in contact with each other, and this temporary fixing is performed using, for example, a clamp or the like. Good. And the reinforcement steel material 20 is comprised by joining the edge parts of the some reinforcement steel material segment 32 temporarily fixed. In this case, the procedure is as follows. As shown in the specific example described below, a plurality of reinforcing steel material segments 32 are joined on the main steel material 18 while their end portions are butted together, and the reinforcing steel materials 20 are sequentially added. It is particularly preferable to adopt a procedure that constitutes In addition, a part of the reinforcing steel material 20 thus configured is fixed to the main steel material 18 by welding, and usually only one end or both ends are fixed to the main steel material 18 by welding. The portion may also be fixed to the main steel material 18.

かかる手順の具体例について説明すると、先ず、最初の補強鋼材セグメント32を、その上端が柱梁接合部の下端に当接するようにして主鋼材18にクランプで仮止めし、その上端を柱梁接合部の下端に溶接する。その溶接箇所を図1(A)にW1で示した。次に、2番目の補強鋼材接面と32を、その上端と、最初の補強鋼材セグメント32の下端とを突き合わせるようにして、主鋼材18に仮止めし、突き合わせた端部どうしを溶接ないしボルト接合により接合する。図1(A)に示した具体例では、溶接により接合しており、その溶接箇所をW2で示した。以下、同様にして順次下方へ補強鋼材セグメント32を接合して行くことで、補強鋼材20を構成し、補強鋼材20の下端に位置することになる最後の補強鋼材セグメント32は、その寸法を現物合わせするために現場で切断した上で接合し、その最後の補強鋼材セグメント32の下端をベースプレート12に溶接する。その溶接箇所を図1(A)にW3で示した。以上の手順を採用することによって、主鋼材18と補強鋼材20との両方に殆ど残留応力を残すことなく、補強鋼材20の上端及び下端を主鋼材18に溶接して固定することができ、更に、主鋼材18と補強鋼材20とが寸法誤差のために密接不良を生じるという事態も完璧に回避することができる。   A specific example of such a procedure will be described. First, the first reinforcing steel material segment 32 is temporarily fixed to the main steel material 18 with a clamp so that the upper end of the first segment 32 is in contact with the lower end of the column beam joint, and the upper end is joined to the column beam. Weld to the bottom of the part. The weld location is indicated by W1 in FIG. Next, the second reinforcing steel material contact surface 32 is temporarily fixed to the main steel material 18 so that its upper end and the lower end of the first reinforcing steel material segment 32 are abutted, and the abutted ends are not welded. Join by bolt joint. In the specific example shown in FIG. 1A, welding is performed, and the welded portion is indicated by W2. In the same manner, the reinforcing steel material segments 32 are sequentially joined downward in the same manner, so that the reinforcing steel material 20 is formed, and the last reinforcing steel material segment 32 which is positioned at the lower end of the reinforcing steel material 20 has the dimensions thereof. In order to match them, they are cut and joined in the field, and the lower end of the last reinforcing steel material segment 32 is welded to the base plate 12. The welding location is indicated by W3 in FIG. By adopting the above procedure, it is possible to weld and fix the upper end and the lower end of the reinforcing steel material 20 to the main steel material 18 with almost no residual stress remaining in both the main steel material 18 and the reinforcing steel material 20. The situation in which the main steel material 18 and the reinforcing steel material 20 cause a close defect due to a dimensional error can be completely avoided.

いうまでもないことであるが、図示例の補強方法は、図1の鉄柱10と同様に鋼材を組合せて構成した梁に対しても適用可能であり、そうした場合、その梁の下側に取付ける補強鋼材は、両端を梁の主鋼材に溶接するだけでなく、中間部分の所々でも主鋼材に溶接することが必要になることがあり得る。ただしその場合でも、中間部分での溶接箇所は必要最小限にとどめることが、残留応力の悪影響を回避する上で好ましい。   Needless to say, the reinforcing method of the illustrated example can also be applied to a beam configured by combining steel materials in the same manner as the iron pillar 10 of FIG. 1, and in such a case, it is attached to the lower side of the beam. Reinforced steel may not only need to be welded at both ends to the main steel material of the beam, but may need to be welded to the main steel material at intermediate locations as well. However, even in that case, it is preferable to keep the welded portion at the intermediate portion to the minimum necessary in order to avoid the adverse effect of the residual stress.

以上のようにして、その一部を(上に説明した具体例では、その上端及び下端のみを)溶接により主鋼材18に固定した補強鋼材20が完成したならば、続いて、その補強鋼材20に列設されている複数の下穴22を通して、既存鋼材である主鋼材18に複数の打込み鋲24を打込むことにより、補強鋼材20を主鋼材18に固定する。そして、既述の如く、その際に、主鋼材18の打込み鋲24が打込まれた箇所に形成される主鋼材18の表面膨出部18b(図2参照)が、補強鋼材20の下穴22の座繰り部28に収まることにより、補強鋼材20が主鋼材18に密接した状態で固定される。また、別具体例として、溶接により補強鋼材セグメント32を1本継ぎ足すごとに、その継ぎ足した補強鋼材セグメント32を、打込み鋲24で主鋼材18に固定するようにしてもよい。この場合は、最初に補強鋼材20の一方の端部を構成する補強鋼材セグメント32の一端を溶接したならば打込み鋲24の打ち込みを行い、その後、補強鋼材セグメント32を継ぎ足すごとに打込み鋲24の打ち込みを行い、そして最終的に、補強鋼材20の他端を溶接するという手順になる。また、当然のことながら、複数本の補強鋼材セグメント32を主鋼材18に取付けて行く際には、最初に一番下の補強鋼材セグメント32の下端をベースプレート12に溶接し、鉄柱10の下端側から上方へ向かって順次、補強鋼材セグメント32を継ぎ足して行くようにしてもよい。いずれの手順を採用するにしても、本発明によれば、補強鋼材20及び打込み鋲24に残留応力が入ることを好適に回避することが可能である。   As described above, when the reinforcing steel material 20 is partially fixed to the main steel material 18 by welding (in the specific example described above, only the upper and lower ends), the reinforcing steel material 20 is subsequently completed. The reinforcing steel material 20 is fixed to the main steel material 18 by driving a plurality of driving rods 24 into the main steel material 18 that is an existing steel material through the plurality of pilot holes 22 arranged in the above. As described above, at this time, the surface bulging portion 18b (see FIG. 2) of the main steel material 18 formed at the place where the driving rod 24 of the main steel material 18 is driven is a pilot hole of the reinforcing steel material 20. By being accommodated in the counterbore portion 28 of 22, the reinforcing steel material 20 is fixed in close contact with the main steel material 18. As another specific example, each time the reinforcing steel material segment 32 is added by welding, the added reinforcing steel material segment 32 may be fixed to the main steel material 18 with the driving rod 24. In this case, if one end of the reinforcing steel material segment 32 constituting one end of the reinforcing steel material 20 is first welded, the driving rod 24 is driven, and then the driving rod 24 is added each time the reinforcing steel material segment 32 is added. And finally, the other end of the reinforcing steel material 20 is welded. As a matter of course, when attaching a plurality of reinforcing steel material segments 32 to the main steel material 18, the lower end of the lowermost reinforcing steel material segment 32 is first welded to the base plate 12, and the lower end side of the iron pillar 10. The reinforcing steel material segments 32 may be added sequentially from the top to the top. Regardless of which procedure is adopted, according to the present invention, it is possible to suitably avoid the residual stress from entering the reinforcing steel material 20 and the driving rod 24.

次に、図4〜図13を参照して、以上に説明した本発明の実施の形態の幾つかの変形例について説明する。尚、それら変形例を説明するに際して、以上に説明した実施の形態と同一の部分については説明を省略し、相違する部分についてのみ説明する。また、それら変形例はいずれも、図1に示した具体例の鉄柱10に補強を施す場合のものであり、従って、図4〜図7、図8(B)、及び図9〜図13は、図1(B)と同様の鉄柱10の断面平面図であり、図8(A)は、図1(A)と同様の鉄柱10の側面図である。   Next, some modified examples of the embodiment of the present invention described above will be described with reference to FIGS. In describing these modified examples, description of the same parts as those of the above-described embodiment will be omitted, and only different parts will be described. In addition, all of these modifications are cases in which the iron pillar 10 of the specific example shown in FIG. 1 is reinforced, and accordingly, FIGS. 4 to 7, FIG. 8B, and FIGS. 1B is a cross-sectional plan view of the iron pillar 10 similar to FIG. 1B, and FIG. 8A is a side view of the iron pillar 10 similar to FIG. 1A.

図4に示した第1の変形例は、図1の具体例で使用している帯鋼から成る補強鋼材20に替えて、溝形鋼から成る補強鋼材40を使用するようにしたものである。その溝形鋼としては、市販の形鋼を使用してもよく、鋼板を溶接して組立てたものを使用してもよい。   The first modification shown in FIG. 4 uses a reinforcing steel material 40 made of channel steel instead of the reinforcing steel material 20 made of band steel used in the specific example of FIG. . As the grooved steel, a commercially available shape steel may be used, or a steel plate assembled by welding may be used.

図5に示した第2の変形例は、図4に示した変形例に更なる変更を加えて、鉄柱10を補強している溝形鋼から成る2本の補強鋼材40を連結鋼材42を介して相互に連結し、それら2本の補強鋼材40と連結鋼材42とで、鉄柱10の周囲を囲繞したものである。連結鋼材42は、それ自体が鉄柱10のウェブ補強材として機能する。また、連結鋼材42は打込み鋲44によって補強鋼材40に固定されており、そのため補強鋼材40には、図2に示した打込み鋲24のための下穴22及び座繰り部28と同様の下穴及び座繰り部を形成してある。   The second modification shown in FIG. 5 is obtained by adding two modifications to the modification shown in FIG. 4 and connecting two reinforcing steel members 40 made of grooved steel reinforcing the steel pillar 10 with connecting steel members 42. The two reinforcing steel members 40 and the connecting steel member 42 surround the periphery of the iron pillar 10. The connecting steel material 42 itself functions as a web reinforcing material for the iron pillar 10. Further, the connecting steel material 42 is fixed to the reinforcing steel material 40 by a driving rod 44, and therefore, the reinforcing steel material 40 has a pilot hole similar to the pilot hole 22 and the counterbore portion 28 for the driving rod 24 shown in FIG. And a countersink part is formed.

図6に示した第3の変形例は、図5の変形例と同様のものであるが、連結鋼材42を補強鋼材40に固定するのに、打込み鋲44とボルト46とを併用している点が異なる。連結鋼材42の内側に手を入れにくい場合には、ボルト46として、外側から施工可能なワンサイドボルトを使用するとよい。   The third modified example shown in FIG. 6 is the same as the modified example of FIG. 5, but the driving rod 44 and the bolt 46 are used together to fix the connecting steel material 42 to the reinforcing steel material 40. The point is different. When it is difficult to put a hand inside the connecting steel material 42, a one-side bolt that can be constructed from the outside may be used as the bolt 46.

図7に示した第4の変形例は、図1の具体例で使用している帯鋼から成る補強鋼材20に替えて、断面L字形の形鋼から成る補強鋼材50を使用するようにしたものである。鉄柱10に取付けられる2本の補強鋼材50には、相互に重ね合わせるための重ね代が設けられており、この重ね代において、それら2本の補強鋼材50を打込み鋲52によって相互に連結することで、それら2本の補強鋼材50で鉄柱10の周囲を囲繞している。打込み鋲52によって固定するために、内外に重ね合わされた重ね代のうち、外側に位置する重ね代には、図2に示した打込み鋲24のための下穴22及び座繰り部28と同様の下穴及び座繰り部を形成してある。尚、打込み鋲52に替えて、補強鋼材50どうしをボルトで連結するようにしてもよい。また、図7に示した変形例では更に、ウェブ補強材54が同じく打込み鋲52によって取付けられており、このウェブ補強材54にも下穴及び座繰り部を形成してある。   The fourth modification shown in FIG. 7 uses a reinforcing steel material 50 made of a section steel having an L-shaped cross section instead of the reinforcing steel material 20 made of a strip steel used in the specific example of FIG. Is. The two reinforcing steel members 50 attached to the steel pillar 10 are provided with a stacking allowance for overlapping each other, and in the stacking allowance, the two reinforcing steel members 50 are connected to each other by the driving rod 52. Thus, the two reinforcing steel members 50 surround the iron pillar 10. Among the overlapping allowances overlapped inside and outside to be fixed by the driving rod 52, the overlapping allowance located outside is similar to the pilot hole 22 and the counterbore 28 for the driving rod 24 shown in FIG. A pilot hole and a countersink are formed. Instead of the driving rod 52, the reinforcing steel materials 50 may be connected with bolts. Further, in the modification shown in FIG. 7, the web reinforcing member 54 is also attached by a driving bar 52, and the web reinforcing member 54 is also formed with a pilot hole and a countersink portion.

図8の(A)及び(B)に示したのは第5の変形例であり、この変形例が図1の具体例と異なる点は、打込み鋲24を打込むことで主鋼材18に固定された補強鋼材20を、拘束手段を用いて固定位置に拘束し、それによって、補強鋼材20を固定している打込み鋲24の緩みを防止するようにしたことにある。鉄柱10を備えた構成構造物が、地震や強風による大荷重を長年に亘って反復して受けていると、補強鋼材20を固定している打込み鋲24が次第に抜け出して、補強の効果がなくなる恐れがある。そのため図8の変形例では、拘束手段によって補強鋼材20を固定位置に拘束することで、打込み鋲24の緩みを防止するようにしたものである。この図8の変形例において、拘束手段は、複数の鋼板製の外れ留め板60と、それら外れ留め板60を固定するためのボルト62及びナット64とを含むものである。   FIGS. 8A and 8B show a fifth modified example, and this modified example is different from the specific example of FIG. 1 in that it is fixed to the main steel material 18 by driving a driving rod 24. The reinforced steel material 20 is restrained at a fixed position by using restraining means, thereby preventing loosening of the driving rod 24 fixing the reinforced steel material 20. When the structural structure including the steel pillar 10 is repeatedly subjected to a heavy load caused by an earthquake or a strong wind over many years, the driving rod 24 fixing the reinforcing steel material 20 is gradually pulled out and the effect of reinforcement is lost. There is a fear. Therefore, in the modified example of FIG. 8, the reinforcing steel member 20 is restrained to the fixed position by the restraining means so that the driving rod 24 is prevented from loosening. In the modification of FIG. 8, the restraining means includes a plurality of steel plate separation plates 60, and bolts 62 and nuts 64 for fixing the separation plates 60.

図9に示した第6の変形例は、図4に示した変形例に更に、図8の変形例の拘束手段と同様の機能を有する拘束手段を付加したものである。図9の変形例の拘束手段は、補強鋼材40に形成したボルト穴に挿通したボルト66と、ボルト66に螺合するナット68とを含むものである。   The sixth modification shown in FIG. 9 is obtained by adding a restraining means having the same function as the restraining means of the modification shown in FIG. 8 to the modification shown in FIG. 9 includes a bolt 66 inserted through a bolt hole formed in the reinforcing steel member 40, and a nut 68 that is screwed into the bolt 66.

図10に示した第7の変形例は、図1に示した変形例に、図8及び図9の夫々の変形例の拘束手段と同様の機能を有する拘束手段を付加したものである。ただし、この図10の変形例の拘束手段は、その構成が、図8や図9の変形例の拘束手段の構成とは大きく異なっており、鋼製のベルト70と、ベルト70を結束するためのベルト留め金具72とを含むものである。   The seventh modification shown in FIG. 10 is obtained by adding a restraining means having the same function as the restraining means of the modifications shown in FIGS. 8 and 9 to the modification shown in FIG. However, the constraining means of the modified example of FIG. 10 is greatly different from the constraining means of the modified examples of FIG. 8 and FIG. 9 in order to bind the steel belt 70 and the belt 70 together. The belt fastener 72 is included.

図11、図12、及び図13に示した第8〜第10の変形例は、いずれも、図10の変形例の拘束手段と同じく、鋼製のベルト70とベルト留め具72とを含む拘束手段を備えたものである。図11の変形例は、図1の具体例に、かかる拘束手段を付加したものであり、また、図12及び図13の変形例は、夫々、図5及び図7の変形例に、かかる拘束手段を付加したものである。   Each of the eighth to tenth modification examples shown in FIGS. 11, 12, and 13 includes a steel belt 70 and a belt fastener 72, similar to the constraint means of the modification example of FIG. Means are provided. The modification of FIG. 11 is obtained by adding such a restraining means to the specific example of FIG. 1, and the modifications of FIGS. 12 and 13 are the same as the modifications of FIGS. 5 and 7, respectively. Means are added.

本発明に係る補強方法を適用可能な鋼製構造物は、図1(A)及び(B)に示したものに限られず、その他の様々な鋼製構造物に対しても、本発明に係る補強方法を好適に適用することができる。図14〜図18は、図1〜図13に示した鉄柱10とは構造の異なる鉄柱10’に、本発明に係る既存鋼製構造物の補強方法を用いて様々に補強を施した場合を示したものである。鉄柱10’は、いわゆるボックス柱であって、等辺山形鋼から成る4本の主鋼材18を並列にして鉛直に延在させ、図1の具体例のものと同様の帯鋼から成る連結斜材17を介してそれら主鋼材18を相互に連結することで、全体としてトラス構造となるように構成したものであり、それら4本の主鋼材18は、その各々が、断面矩形の鉄柱10’の四隅に位置している。   The steel structure to which the reinforcing method according to the present invention can be applied is not limited to that shown in FIGS. 1 (A) and (B), and the present invention also applies to various other steel structures. The reinforcing method can be suitably applied. FIGS. 14 to 18 show the case where various reinforcements are applied to the iron pillar 10 ′ having a structure different from that of the iron pillar 10 shown in FIGS. 1 to 13 by using the reinforcing method of the existing steel structure according to the present invention. It is shown. The iron pillar 10 'is a so-called box pillar, and is composed of four main steel members 18 made of equilateral angle steel and extending vertically in parallel, and a connecting diagonal member made of a strip steel similar to that of the specific example of FIG. The main steel members 18 are connected to each other via 17 so as to form a truss structure as a whole. Each of the four main steel members 18 is composed of a steel column 10 ′ having a rectangular cross section. Located in the four corners.

図14に示した具体例では、断面矩形の鉄柱10’の四辺に各々、帯鋼から成る補強鋼材20’が取付けられている。従って、鉄柱10’は、合計4本の補強鋼材20’を取付けることで補強がなされている。それら補強鋼材20’は、鉄柱10’を備えた鉄骨造建物が竣工した時点では主鋼材18に取付けられておらず、築後時間を経て既存鉄骨構造物となったその鉄骨造建物を補強するために、本発明の補強方法に従って、既存鋼材である主鋼材18に取付けられたものである。また、主鋼材18は長尺鋼材であり、一方、補強鋼材20は、この主鋼材18の長手方向に沿わせてこの主鋼材18に取付けるようにした長尺鋼材である。長尺鋼材である補強鋼材20には、その長手方向に複数の下穴が列設されており、それら下穴は図2に示した下穴22と同じものである。そして、それら下穴を通して主鋼材18に打込み鋲24’を打込むことによって、補強鋼材20’を主鋼材18に固定するようにしている。補強鋼材20’を主鋼材18に固定する際の作業手順は、図1(A)及び(B)に示した具体例に関連して説明した手順と同様とすることができる。   In the specific example shown in FIG. 14, reinforcing steel members 20 ′ made of strip steel are attached to the four sides of the iron pillar 10 ′ having a rectangular cross section. Therefore, the iron pillar 10 'is reinforced by attaching a total of four reinforcing steel members 20'. These reinforcing steel members 20 ′ are not attached to the main steel member 18 at the time of completion of the steel building with the steel pillar 10 ′, and reinforce the steel building that has become an existing steel structure after a period of time. Therefore, according to the reinforcing method of the present invention, it is attached to the main steel material 18 which is an existing steel material. The main steel material 18 is a long steel material, while the reinforcing steel material 20 is a long steel material that is attached to the main steel material 18 along the longitudinal direction of the main steel material 18. A plurality of pilot holes are arranged in the longitudinal direction of the reinforcing steel material 20 which is a long steel material, and these pilot holes are the same as the pilot holes 22 shown in FIG. Then, the reinforcing steel material 20 ′ is fixed to the main steel material 18 by driving a driving rod 24 ′ into the main steel material 18 through the prepared holes. The work procedure for fixing the reinforcing steel material 20 ′ to the main steel material 18 can be the same as the procedure described in connection with the specific example shown in FIGS. 1 (A) and 1 (B).

図15〜図18に示した具体例は、図14に示した具体例の変形例に相当するものである。それゆえ、以下にそれらについて説明する上では、図14に示した具体例と同一の部分については説明を省略し、相違する部分についてのみ説明する。   The specific examples shown in FIGS. 15 to 18 correspond to modifications of the specific example shown in FIG. Therefore, in describing them below, description of the same parts as the specific example shown in FIG. 14 will be omitted, and only different parts will be described.

図15に示した変形例では、図14の具体例で使用している帯鋼から成る4本の補強鋼材20’に替えて、溝形鋼から成る2本の補強鋼材40’を使用するようにしたものである。それら2本の補強鋼材40’を、鉄柱10’の互いに対向する位置に取付けて、それら補強鋼材40’を、連結鋼材42’を介して相互に連結し、それによって、それら2本の補強鋼材40’と連結鋼材42’とで、鉄柱10’の周囲を囲繞したものである。連結鋼材42’は、打込み鋲44’によって補強鋼材40’に固定されている。ただし、打込み鋲44’の替わりに、或いは、打込み鋲44’と併用して、ボルトを使用するようにしてもよい。   In the modification shown in FIG. 15, two reinforcing steel members 40 ′ made of channel steel are used in place of the four reinforcing steel members 20 ′ made of band steel used in the specific example of FIG. 14. It is a thing. The two reinforcing steel members 40 ′ are attached to the positions opposite to each other of the iron pillar 10 ′, and the reinforcing steel members 40 ′ are connected to each other via a connecting steel member 42 ′, whereby the two reinforcing steel members 40 ′. 40 'and connecting steel material 42' surround the iron pillar 10 '. The connecting steel material 42 'is fixed to the reinforcing steel material 40' by a driving rod 44 '. However, a bolt may be used instead of the driving rod 44 'or in combination with the driving rod 44'.

図16に示した変形例は、図14の具体例で使用している帯鋼から成る4本の補強鋼材20’に替えて、コ字形とL字形との中間的な断面形状を有する形鋼から成る2本の補強鋼材50’を使用するようにしたものである。鉄柱10’に取付けられる2本の補強鋼材50’には、相互に重ね合わせるための重ね代が設けられており、この重ね代において、それら2本の補強鋼材50’を打込み鋲52’によって相互に連結することで、それら2本の補強鋼材50’で鉄柱10’の周囲を囲繞している。打込み鋲52’によって固定するために、内外に重ね合わされた重ね代のうち、外側に位置する重ね代には、図2に示した打込み鋲24のための下穴22及び座繰り部28と同様の下穴及び座繰り部を形成してある。尚、打込み鋲52’に替えて、補強鋼材50’どうしをボルトで連結するようにしてもよい。   The modified example shown in FIG. 16 is a shaped steel having an intermediate cross-sectional shape between a U-shape and an L-shape instead of the four reinforcing steel members 20 ′ made of the steel strip used in the specific example of FIG. The two reinforcing steel materials 50 ′ made of are used. The two reinforcing steel members 50 ′ attached to the iron pillar 10 ′ are provided with a stacking allowance for overlapping each other. In this stacking allowance, the two reinforcing steel members 50 ′ are mutually connected by a driving rod 52 ′. The two reinforcing steel members 50 'surround the iron pillar 10'. Among the overlap allowances overlapped inside and outside to be fixed by the drive rod 52 ', the overlap allowance located outside is similar to the pilot hole 22 and the counterbore 28 for the drive rod 24 shown in FIG. A pilot hole and a countersink are formed. Instead of the driving rod 52 ', the reinforcing steel members 50' may be connected with bolts.

図17に示した変形例は、図14の具体例で使用している帯鋼から成る4本の補強鋼材20’に替えて、断面L字形の形鋼から成る4本の補強鋼材50”を使用するようにしたものである。鉄柱10’に取付けられる4本の補強鋼材50”には、相互に重ね合わせるための重ね代が設けられており、この重ね代において、それら4本の補強鋼材50”を打込み鋲52’によって相互に連結することで、それら4本の補強鋼材50”で鉄柱10’の周囲を囲繞している。打込み鋲52’によって固定するために、内外に重ね合わされた重ね代のうち、外側に位置する重ね代には、図2に示した打込み鋲24のための下穴22及び座繰り部28と同様の下穴及び座繰り部を形成してある。尚、打込み鋲52’に替えて、補強鋼材50”どうしをボルトで連結するようにしてもよい。   In the modified example shown in FIG. 17, instead of the four reinforcing steel members 20 ′ made of strip steel used in the specific example of FIG. 14, four reinforcing steel members 50 ″ made of section steel having an L-shaped cross section are used. The four reinforcing steel members 50 ″ attached to the iron pillar 10 ′ are provided with a stacking allowance for overlapping each other, and in this stacking allowance, these four reinforcing steel members are used. 50 ″ are connected to each other by a driving bar 52 ′, and the four reinforcing steel members 50 ″ surround the iron pillar 10 ′. Among the overlap allowances overlapped inside and outside to be fixed by the drive rod 52 ', the overlap allowance located outside is similar to the pilot hole 22 and the counterbore 28 for the drive rod 24 shown in FIG. A pilot hole and a countersink are formed. Instead of the driving rod 52 ', the reinforcing steel members 50 "may be connected with bolts.

図18に示した変形例は、図14の具体例で使用している帯鋼から成る4本の補強鋼材20’に替えて、山形鋼から成る4本の補強鋼材51を使用するようにしたものである。それら4本の補強鋼材51を、鉄柱10’の4本の主鋼材18の各々に重ねるようにして取付け、それら補強鋼材51を、連結鋼材42’を介して相互に連結し、それによって、それら2本の補強鋼材51と連結鋼材42’とで、鉄柱10’の周囲を囲繞したものである。連結鋼材42’は、打込み鋲44’によって補強鋼材51に固定されているが、打込み鋲44’の替わりに、或いは、打込み鋲44’と併用して、ボルトを使用するようにしてもよい。   The modification shown in FIG. 18 uses four reinforcing steel members 51 made of angle steel instead of the four reinforcing steel members 20 ′ made of band steel used in the specific example of FIG. Is. The four reinforcing steel members 51 are attached so as to overlap each of the four main steel members 18 of the iron pillar 10 ', and the reinforcing steel members 51 are connected to each other via a connecting steel member 42', thereby The two reinforcing steel members 51 and the connecting steel member 42 'surround the iron pillar 10'. The connecting steel member 42 ′ is fixed to the reinforcing steel member 51 by a driving rod 44 ′, but a bolt may be used instead of the driving rod 44 ′ or in combination with the driving rod 44 ′.

(A)及び(B)は、本発明に係る既存鋼製構造物の補強方法を用いて補強を施した鋼製構造物の具体例を示した図であり、夫々、鋼材を組合せて構成した鉄柱の側面図及び断面平面図である。(A) And (B) is the figure which showed the specific example of the steel structure reinforced using the reinforcement method of the existing steel structure which concerns on this invention, and each comprised combining steel materials. It is the side view and sectional top view of an iron pillar. 打込み鋲を用いて既存鋼材である主鋼材に固定した補強鋼材の固定箇所の断面図である。It is sectional drawing of the fixed location of the reinforcement steel materials fixed to the main steel materials which are the existing steel materials using a driving rod. (A)及び(B)は、補強鋼材セグメントの端部の突き合わせ箇所の平面図及び側面図である。(A) And (B) is the top view and side view of the butt | matching location of the edge part of a reinforced steel material segment. 図1乃至図3に示した具体例の第1の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。FIG. 4 is a cross-sectional plan view of the iron pillar in FIG. 1 for explaining a reinforcing method according to a first modification of the specific example shown in FIGS. 1 to 3. 図1乃至図3に示した具体例の第2の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。FIG. 4 is a cross-sectional plan view of the iron pillar in FIG. 1 for explaining a reinforcing method according to a second modification of the specific example shown in FIGS. 1 to 3. 図1乃至図3に示した具体例の第3の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。FIG. 4 is a cross-sectional plan view of the iron pillar in FIG. 1 for explaining a reinforcing method according to a third modification of the specific example shown in FIGS. 1 to 3. 図1乃至図3に示した具体例の第4の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。It is a cross-sectional top view of the iron pillar of FIG. 1 for demonstrating the reinforcement method which concerns on the 4th modification of the specific example shown in FIG. 1 thru | or FIG. (A)及び(B)は、図1乃至図3に示した具体例の第5の変形例に係る補強方法を説明するための図であり、夫々、図1の鉄柱の側面図及び断面平面図である。(A) And (B) is a figure for demonstrating the reinforcement method which concerns on the 5th modification of the specific example shown in FIG. 1 thru | or FIG. 3, The side view and sectional plane of the iron pillar of FIG. 1, respectively. FIG. 図1乃至図3に示した具体例の第6の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。It is a cross-sectional top view of the iron pillar of FIG. 1 for demonstrating the reinforcement method which concerns on the 6th modification of the specific example shown in FIG. 1 thru | or FIG. 図1乃至図3に示した具体例の第7の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。It is a cross-sectional top view of the iron pillar of FIG. 1 for demonstrating the reinforcement method which concerns on the 7th modification of the specific example shown in FIG. 1 thru | or FIG. 図1乃至図3に示した具体例の第8の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。It is a cross-sectional top view of the iron pillar of FIG. 1 for demonstrating the reinforcement method which concerns on the 8th modification of the specific example shown in FIG. 1 thru | or FIG. 図1乃至図3に示した具体例の第9の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。It is a cross-sectional top view of the iron pillar of FIG. 1 for demonstrating the reinforcement method which concerns on the 9th modification of the specific example shown in FIG. 1 thru | or FIG. 図1乃至図3に示した具体例の第10の変形例に係る補強方法を説明するための、図1の鉄柱の断面平面図である。It is a cross-sectional top view of the iron pillar of FIG. 1 for demonstrating the reinforcement method which concerns on the 10th modification of the specific example shown in FIG. 1 thru | or FIG. 本発明に係る既存鋼製構造物の補強方法を用いて補強を施した鋼製構造物の別の具体例を示した図であり、鋼材を組合せて構成した鉄柱の断面平面図である。It is the figure which showed another specific example of the steel structure reinforced using the reinforcement method of the existing steel structure which concerns on this invention, and is a cross-sectional top view of the iron pillar comprised combining the steel materials. 図14に示した具体例の第1の変形例に係る補強方法を説明するための、図14の鉄柱の断面平面図である。FIG. 15 is a cross-sectional plan view of the iron pillar in FIG. 14 for describing a reinforcing method according to a first modification of the specific example shown in FIG. 14. 図14に示した具体例の第2の変形例に係る補強方法を説明するための、図14の鉄柱の断面平面図である。FIG. 15 is a cross-sectional plan view of the iron pillar in FIG. 14 for describing a reinforcing method according to a second modification of the specific example shown in FIG. 14. 図14に示した具体例の第3の変形例に係る補強方法を説明するための、図14の鉄柱の断面平面図である。FIG. 15 is a cross-sectional plan view of the iron pillar in FIG. 14 for describing a reinforcing method according to a third modification of the specific example shown in FIG. 14. 図14に示した具体例の第4の変形例に係る補強方法を説明するための、図14の鉄柱の断面平面図である。FIG. 15 is a cross-sectional plan view of the iron pillar in FIG. 14 for describing a reinforcing method according to a fourth modification of the specific example shown in FIG. 14.

符号の説明Explanation of symbols

10……鉄柱、10’……鉄柱、18……鉄柱の主鋼材(既存鋼材)、18b……主鋼材の表面膨出部、20……補強鋼材、22……下穴、24……打込み鋲、28……座繰り部、32……補強鋼材セグメント。
10 …… Iron column, 10 ′ …… Iron column, 18 …… Main steel material (existing steel material) of the iron column, 18b …… Surface bulging part of the main steel material, 20 …… Reinforced steel material, 22 …… Prepared hole, 24 …… Driving鋲, 28 ... Counter-sink, 32 ... Reinforced steel segment.

Claims (11)

既存鋼製構造物を構成している既存鋼材に補強鋼材を取付けて当該既存鋼製構造物を補強する方法において、
打込み鋲の軸部の長さより小さい板厚を有する帯鋼または形鋼から成り、既存鋼材の表面に当接させる当接面を有し、打込み鋲の軸部を挿通するための貫通穴である下穴が前記当接面に開口しており、前記下穴の前記当接面側の開口部に座繰り部が形成されている補強鋼材を製作するステップと、
前記補強鋼材の前記当接面を前記既存鋼材の表面に当接させて、前記補強鋼材を前記既存鋼材に仮止めするステップと、
前記下穴を通して前記既存鋼材に打込み鋲を打込むことにより前記補強鋼材を前記既存鋼材に固定するステップとを含み、
前記既存鋼材の前記打込み鋲が打込まれた箇所に形成される前記既存鋼材の表面膨出部が前記補強鋼材の前記座繰り部に収まるようにした、
ことを特徴とする既存鋼製構造物の補強方法。
In a method for reinforcing a steel structure by attaching a reinforcing steel material to an existing steel material constituting the existing steel structure,
It is a through-hole for inserting the shaft portion of the driving rod, which is made of a steel strip or a shape steel having a smaller thickness than the shaft portion of the driving rod, has a contact surface that makes contact with the surface of the existing steel material Producing a reinforcing steel material in which a pilot hole is opened in the contact surface, and a countersunk portion is formed in an opening of the pilot hole on the contact surface side;
Abutting the abutment surface of the reinforcing steel material against the surface of the existing steel material, and temporarily fixing the reinforcing steel material to the existing steel material;
Fixing the reinforcing steel material to the existing steel material by driving a hammer into the existing steel material through the pilot hole,
The surface bulge portion of the existing steel material formed at a location where the driving rod of the existing steel material is driven is accommodated in the countersink portion of the reinforcing steel material.
A method of reinforcing an existing steel structure characterized by the above.
前記既存鋼材は長尺鋼材であり、
前記補強鋼材は前記既存鋼材の長手方向に沿わせて前記既存鋼材に取付けるようにした長尺鋼材であり、
前記補強鋼材はその長手方向に複数の前記下穴が列設されており、
前記補強鋼材の一部を前記既存鋼材に溶接して固定し複数の前記下穴を通して前記既存鋼材に複数の打込み鋲を打込むことにより前記補強鋼材を前記既存鋼材に固定するようにした、
ことを特徴とする請求項1記載の既存鋼製構造物の補強方法。
The existing steel material is a long steel material,
The reinforcing steel material is a long steel material that is attached to the existing steel material along the longitudinal direction of the existing steel material,
The reinforcing steel material has a plurality of pilot holes arranged in a longitudinal direction thereof,
A part of the reinforcing steel material is welded and fixed to the existing steel material, and the reinforcing steel material is fixed to the existing steel material by driving a plurality of driving rods into the existing steel material through the plurality of pilot holes.
The method for reinforcing an existing steel structure according to claim 1.
前記補強鋼材の端部を前記既存鋼材に溶接して固定するようにしたことを特徴とする請求項2記載の既存鋼製構造物の補強方法。   The method for reinforcing an existing steel structure according to claim 2, wherein an end portion of the reinforcing steel material is welded and fixed to the existing steel material. 端部どうしを互いに突き合わせて接合することにより前記補強鋼材を構成する複数の補強鋼材セグメントを製作し、
前記既存鋼材上において、複数の前記補強鋼材セグメントを、それらの端部どうしを突き合わせて接合して順次継ぎ足すことにより、前記補強鋼材を構成する、
ことを特徴とする請求項2又は3記載の既存鋼製構造物の補強方法。
Producing a plurality of reinforcing steel material segments constituting the reinforcing steel material by joining the end portions to each other,
On the existing steel material, a plurality of the reinforcing steel material segments are joined to each other by abutting their end portions, and the reinforcing steel material is configured by sequentially adding, to constitute the reinforcing steel material.
The method for reinforcing an existing steel structure according to claim 2 or 3, characterized by the above.
前記既存鋼材上において前記補強鋼材を構成した後に、前記補強鋼材の前記下穴を通して前記既存鋼材に打込み鋲を打込むことにより、前記補強鋼材を前記既存鋼材に固定するようにした、
ことを特徴とする請求項4記載の既存鋼製構造物の補強方法。
After the reinforcing steel material is configured on the existing steel material, the reinforcing steel material is fixed to the existing steel material by driving a hammer into the existing steel material through the pilot hole of the reinforcing steel material.
The method for reinforcing an existing steel structure according to claim 4.
前記既存鋼材上において前記補強鋼材セグメントを1本継ぎ足すごとに、その継ぎ足した補強鋼材セグメントの前記下穴を通して前記既存鋼材に打込み鋲を打込むことにより、その継ぎ足した補強鋼材セグメントを前記既存鋼材に固定するようにし、もって前記既存鋼材に固定された前記補強鋼材が構成されるようにした、
ことを特徴とする請求項4記載の既存鋼製構造物の補強方法。
Each time one reinforcing steel segment is added on the existing steel material, a hammer is driven into the existing steel material through the pilot hole of the added reinforcing steel segment, so that the added reinforcing steel segment is connected to the existing steel material. So that the reinforcing steel material fixed to the existing steel material is configured,
The method for reinforcing an existing steel structure according to claim 4.
前記既存鋼材が、前記既存構成構造物の柱または梁を構成している当該柱または梁の長手方向に延在する鋼材であり、
前記既存鋼製構造物の1本の柱または梁に複数本の前記補強鋼材を取付け、それら複数本の前記補強鋼材を相互に連結して、それら複数本の前記補強鋼材で当該柱または梁の周囲を囲繞し、
相互に連結する複数本の前記補強鋼材には、相互に重ね合わせるための重ね代を設けておき、当該重ね代において、それら複数本の前記補強鋼材を打込み鋲またはボルトにより相互に連結する、
ことを特徴とする請求項1乃至6の何れか1項記載の既存鋼製構造物の補強方法。
The existing steel material is a steel material extending in the longitudinal direction of the pillar or beam constituting the pillar or beam of the existing structural structure,
A plurality of the reinforcing steel members are attached to one column or beam of the existing steel structure, the plurality of reinforcing steel members are connected to each other, and the plurality of the reinforcing steel members are used to connect the columns or beams. Surrounding the surroundings,
A plurality of the reinforcing steel materials to be connected to each other are provided with a stacking allowance for overlapping each other, and in the stacking allowance, the plurality of reinforcing steel materials are connected to each other by a driving rod or a bolt,
The method for reinforcing an existing steel structure according to any one of claims 1 to 6.
前記既存鋼材が、前記既存構成構造物の柱または梁を構成している当該柱または梁の長手方向に延在する鋼材であり、
前記既存鋼製構造物の1本の柱または梁に複数本の前記補強鋼材を取付け、それら複数本の前記補強鋼材を連結鋼材を介して相互に連結して、それら複数本前記補強鋼材と前記連結鋼材とで当該柱または梁の周囲を囲繞し、
前記連結鋼材と、前記連結鋼材を介して相互に連結する複数本の前記補強鋼材とを、打込み鋲またはボルトにより相互に連結する、
ことを特徴とする請求項1乃至6の何れか1項記載の既存鋼製構造物の補強方法。
The existing steel material is a steel material extending in the longitudinal direction of the pillar or beam constituting the pillar or beam of the existing structural structure,
A plurality of the reinforcing steel members are attached to one column or beam of the existing steel structure, the plurality of reinforcing steel members are connected to each other via a connecting steel member, and the plurality of the reinforcing steel members and the Surround the pillar or beam with connecting steel,
The connecting steel material and a plurality of the reinforcing steel materials connected to each other via the connecting steel material are connected to each other by a driving rod or a bolt,
The method for reinforcing an existing steel structure according to any one of claims 1 to 6.
打込み鋲を打込むことにより前記既存鋼材に固定された前記補強鋼材を、拘束手段を用いて固定位置に拘束し、それによって、前記補強鋼材を固定している打込み鋲の緩みを防止するようにした、
ことを特徴とする請求項1乃至6の何れか1項記載の既存鋼製構造物の補強方法。
The reinforcing steel material fixed to the existing steel material by driving the driving rod is constrained to a fixed position by using a restraining means, thereby preventing loosening of the driving rod fixing the reinforcing steel material. did,
The method for reinforcing an existing steel structure according to any one of claims 1 to 6.
前記拘束手段が鋼板製の外れ留め板を含むことを特徴とする請求項9記載の既存鋼製構造物の補強方法。   The method for reinforcing an existing steel structure according to claim 9, wherein the restraining means includes a steel plate retaining plate. 前記拘束手段が鋼製のベルトを含むことを特徴とする請求項9記載の既存鋼製構造物の補強方法。
The method for reinforcing an existing steel structure according to claim 9, wherein the restraining means includes a steel belt.
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