JPH08270227A - Repair method for existing roof truss having large span - Google Patents

Repair method for existing roof truss having large span

Info

Publication number
JPH08270227A
JPH08270227A JP9591095A JP9591095A JPH08270227A JP H08270227 A JPH08270227 A JP H08270227A JP 9591095 A JP9591095 A JP 9591095A JP 9591095 A JP9591095 A JP 9591095A JP H08270227 A JPH08270227 A JP H08270227A
Authority
JP
Japan
Prior art keywords
truss
reinforcing
shed
chord member
hut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP9591095A
Other languages
Japanese (ja)
Inventor
Yoshimitsu Murahashi
喜満 村橋
Hiroaki Kawakami
寛明 川上
Kazuki Inaba
一樹 稲葉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP9591095A priority Critical patent/JPH08270227A/en
Publication of JPH08270227A publication Critical patent/JPH08270227A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE: To contrive how to minimize the amount of a reinforcing material to be used and simplify on-site work. CONSTITUTION: The central part of a hut truss which is deflected downward is lifted up, thereby canceling a compression force which acts on a top chord of a roof truss 1 in a downwardly deflected state and a tensile force which acts on a lower chord. In this equilibrium state, a reinforcing chord member 4 having a specified length is fixed with both top and lower chords 2 and 3 or either one chord. A fixed load of a housing skeleton is forced to act on the reinforcing chord member 4 and both top and lower chord members 2 and 3 by releasing a lifting force.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、大スパン構造物、例え
ば飛行機格納庫,造船所,製鉄所等の設備機能上、柱を
設けられない各種大スパン工場において、例えば建屋内
設備の更新改造等で建屋に作用する荷重が増加して、補
強の必要性が生じたときの大スパンを有する既設小屋組
みの補強方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large span structure, such as an aircraft hangar, a shipyard, a steelworks, etc., in various large span factories that are not provided with pillars, for example, renewal and modification of building facilities. The present invention relates to a method of reinforcing an existing shed having a large span when the load acting on the building increases and the need for reinforcement arises.

【0002】[0002]

【従来の技術】図11に示すような通常の小屋組みにお
ける小屋トラス1は、上弦材2と下弦材3との間に垂直
材7及び斜材(ラチス)8を組んで構成され、小屋トラ
ス1の両端は鉄骨柱5で支えられている。前述の小屋ト
ラス1において、鉄骨柱5のスパンは50m〜100m
程度あり、小屋トラス1に屋根材や鉄骨部材の自重(つ
まり固定荷重)や積雪荷重が作用するとこの小屋トラス
1は図11に2点鎖線で示す様に中央部が下方に撓み変
形する。そして、例えば、設備増強等の理由により小屋
トラス1に作用する荷重が増加すると、小屋トラス1は
さらに変形すると共に、発生する応力も増加するため、
小屋トラス1を構成する部材には、許容応力を超過する
部材が出てくる。
2. Description of the Related Art A shed truss 1 in an ordinary shed assembly as shown in FIG. 11 is constructed by assembling a vertical member 7 and a diagonal member (lattice) 8 between an upper chord member 2 and a lower chord member 3, and the shed truss 1 Both ends of are supported by steel columns 5. In the above-mentioned hut truss 1, the span of the steel column 5 is 50 m to 100 m.
When the roof truss 1 is subjected to its own weight (ie, a fixed load) or snow load on the truss 1, the hut truss 1 is bent and deformed downward at the center as shown by the chain double-dashed line in FIG. Then, for example, when the load acting on the hut truss 1 increases due to the reasons such as facility enhancement, the hut truss 1 is further deformed and the generated stress also increases.
Among the members constituting the hut truss 1, some members exceed the allowable stress.

【0003】小屋トラス1に作用する荷重が増加し、各
部材の許容応力を超過するとその補強が必要となる。こ
の場合、図12に示すように小屋トラス1を構成してい
る略T字形断面の型鋼を用いた上弦材2と下弦材3に、
これと同じ断面形状でかつ、これと略同じ長さの補強部
材9を沿わせて固定する。そして、この固定手段は、現
場での溶接で行なうことになるため現場作業が膨大なも
のとなる。
If the load acting on the hut truss 1 increases and the allowable stress of each member is exceeded, it is necessary to reinforce the member. In this case, as shown in FIG. 12, the upper chord member 2 and the lower chord member 3 which use the steel having the substantially T-shaped cross section which constitutes the hut truss 1,
The reinforcing member 9 having the same cross-sectional shape and substantially the same length as this is fixed along the reinforcing member 9. Further, since this fixing means is performed by welding at the site, the site work becomes enormous.

【0004】[0004]

【発明が解決しようとする課題】従来の補強方法には次
の欠点がある。 従来の建屋の補強方法は、荷重の増加によって応力
が不足した小屋トラスの断面を補強する。つまり、小屋
トラスの上下弦材が許容応力を超過して撓み変形した状
態において、これに補強部材を当てがい現場溶接で付加
するものであるから、小屋トラス全長に渡って補強が必
要となり、現場での溶接作業が膨大となる。 また、上弦材の応力が超過し、下方に撓み変形した
状態で上弦材の断面を付加する場合、当初の屋根勾配が
変化するため、屋根材の葺き直しの必要性が生じる。こ
れは小屋組みを構成する部材が単材の場合でも同様であ
る。 建設業はいわゆる3K(厳しい,危険,汚い)作業
であり、これの対策として現場作業を簡素化していく傾
向にある。具体的には、現場作業では極力火気を使用せ
ず、ボルト締めによる部材同士の接合が主流となってい
る。このような状況にある一方で、既設小屋組みの補強
方法については、溶接による方法を用いざるを得ないの
が現状であり、そうであるならば、その溶接作業を可及
的に少なくできる方法が望まれるのであるが、従来はこ
の点での改善策が無いのが実情である。 前記,,を踏まえて検討するとき、従来の補
強方法は、3K作業であるだけでなく、コスト,工程面
で問題があった。
The conventional reinforcing method has the following drawbacks. The conventional building reinforcement method is to reinforce the cross section of a shed truss that is stress-deficient due to an increase in load. In other words, when the upper and lower chord members of the hut truss are flexed and deformed by exceeding the allowable stress, a reinforcing member is applied to this by on-site welding, so it is necessary to reinforce the entire truss truss. The amount of welding work in Japan becomes enormous. Further, when the cross section of the upper chord member is added in a state where the upper chord member is overstressed and flexed and deformed downward, the initial roof slope changes, so that it becomes necessary to re-roof the roof member. This is the same even when the members that form the hut structure are single materials. The construction industry is a so-called 3K (severe, dangerous, dirty) work, and as a countermeasure against this, there is a tendency to simplify field work. Specifically, in the field work, the use of fire is not used as much as possible, and the joining of members by bolting is the mainstream. Under these circumstances, the current method is to use welding as a reinforcing method for the existing shed, and if so, there is a method that can reduce the welding work as much as possible. Although desired, it is the actual situation that there has been no improvement measure in this regard in the past. When considering in consideration of the above, and the conventional reinforcing method, there are problems not only in 3K work but also in cost and process.

【0005】本発明は前記の欠点を解決し、補強量の最
小化,現場作業の簡素化を図った大スパンを有する既設
小屋組みの補強方法を提供することを目的とする。
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide a method of reinforcing an existing shed having a large span in which the amount of reinforcement is minimized and the site work is simplified.

【0006】[0006]

【課題を解決するための手段】前記の目的を達成するた
め、第1の発明に係る大スパンを有する既設小屋組みの
補強方法は、下方に撓んだ小屋トラス1の中央部を持上
げることにより、前記下方に撓んだ状態の小屋トラス1
の上弦材2に作用する圧縮力と下弦材3に作用する引張
力を相殺した状態において、前記上下弦材2,3の両方
又は一方に所定長の補強用弦材4を固定し、前記持上げ
力を解除することにより、建屋の固定荷重を前記補強用
弦材4と、小屋トラス1に作用させることを特徴とす
る。また、第2の発明は大スパンを有する既設小屋組み
の補強方法であって、下方に撓んだ小屋トラス1の中央
部を持上げることにより、前記小屋トラス1をその両端
位置で支える内側に柱頭変位した鉄骨柱5を元の垂直位
置に調整し、この状態で、当該鉄骨柱5の外側に沿っ
て、かつ上下方向に伸長してトラス構造の架構6を設置
し、その後前記小屋トラス1の持上げ力を解除すること
により、小屋トラス1にかかる固定荷重を前記架構6お
よび鉄骨柱5に作用させることを特徴とする。第3の発
明は、第1の発明と第2の発明を組合わせてなり、小屋
トラス1を持上げた状態で、上下弦材2,3の一方又は
両方に補強用弦材4を固定し、かつ鉄骨柱5の外側にト
ラス構造の架構6を設け、その後小屋トラス1の持上げ
を解除することを特徴とする。
In order to achieve the above-mentioned object, a method of reinforcing an existing shed structure having a large span according to the first aspect of the present invention is to raise a central portion of a shed truss 1 bent downward. , The hut truss 1 which is bent downward
In a state where the compressive force acting on the upper chord member 2 and the tensile force acting on the lower chord member 3 are offset, a reinforcing chord member 4 having a predetermined length is fixed to both or one of the upper and lower chord members 2 and 3 and is lifted. By releasing the force, a fixed load of the building is applied to the reinforcing chord member 4 and the shed truss 1. A second aspect of the present invention is a method for reinforcing an existing shed having a large span, in which the central portion of the shed truss 1 which is bent downward is lifted to support the shed truss 1 at both ends thereof to the inner stigma. The displaced steel frame column 5 is adjusted to the original vertical position, and in this state, the truss structure frame 6 is installed along the outer side of the steel frame column 5 and extending in the vertical direction, and then the hut truss 1 By releasing the lifting force, a fixed load applied to the hut truss 1 is applied to the frame 6 and the steel column 5. A third invention is a combination of the first invention and the second invention, in which the reinforcing chord member 4 is fixed to one or both of the upper and lower chord members 2 and 3 with the cabin truss 1 raised. In addition, a truss structure frame 6 is provided on the outer side of the steel column 5, and thereafter lifting of the hut truss 1 is released.

【0007】[0007]

【作用】第1発明の補強方法によると、小屋トラス1を
一旦持上げることで、小屋トラス1が下方に撓んだ状態
のとき上弦材2に作用していた圧縮力、下弦材3に作用
していた引張力が相殺されることになる。ここで、補強
用弦材4を追加すれば、建屋の固定荷重についても、小
屋トラス1の既設部材や補強用弦材4の断面が作用する
ため、従来の補強方法(つまり、固定荷重は小屋トラス
1の既設部材、追加荷重は小屋トラス1の既設部材や補
強部材に作用する)よりも、補強用部材4を有効的に使
用でき、しかも補強用弦材4による補強量を大幅に低減
できる。
According to the reinforcing method of the first aspect of the present invention, by lifting the shed truss 1 once, the compressive force acting on the upper chord member 2 and the lower chord member 3 when the shed truss 1 is bent downward. The tensile force that was being applied will be offset. Here, if the reinforcing chords 4 are added, the existing members of the shed truss 1 and the cross section of the reinforcing chords 4 act also on the fixed load of the building, so that the conventional reinforcing method (that is, the fixed load is applied to the shed) The existing member of the truss 1 and the additional load act on the existing member and the reinforcing member of the hut truss 1), and the reinforcing member 4 can be used more effectively, and the amount of reinforcement by the reinforcing chord member 4 can be significantly reduced. .

【0008】第2発明の補強方法によると、第1発明の
小屋トラス1の補強方法に加えて鉄骨柱5の変形が容易
に修正された状態で補強される。つまり、小屋トラス1
の中央部が撓むということは、小屋トラス1を支持して
いるその両端部の鉄骨柱5も内側に変形していることに
なる。そこで、前記の鉄骨柱5にトラス構造の架構6を
設置することで、鉄骨柱5の内側への柱頭部変位が抑制
でき、結果として、小屋トラス1が補強されるので、小
屋トラス1に設置する補強用弦材4による補強量を削減
できる。
According to the reinforcing method of the second aspect of the invention, in addition to the reinforcing method of the truss 1 of the first aspect of the invention, the deformation of the steel column 5 is easily corrected and reinforced. That is, hut truss 1
The bending of the central part of the means means that the steel frame columns 5 at both ends supporting the hut truss 1 are also deformed inward. Therefore, by installing the truss structure frame 6 on the steel column 5, it is possible to suppress the displacement of the column head inside the steel column 5, and as a result, the hut truss 1 is reinforced, so that it is installed on the hut truss 1. The amount of reinforcement by the reinforcing chord member 4 can be reduced.

【0009】第3発明によると、第1の発明と第2の発
明が組合わさることで、小屋トラス1の補強のために必
要な補強用弦材4による補強量をさらに削減できる。
According to the third invention, by combining the first invention and the second invention, it is possible to further reduce the amount of reinforcement by the reinforcing chord member 4 required for the reinforcement of the shed truss 1.

【0010】[0010]

【実施例】以下本発明の実施例を図を参照して説明す
る。図1〜図4は本発明の第1実施例の方法の工程を示
す説明図である。本実施例では、小屋組みの具体例とし
て上弦材2と下弦材3および、上下弦材2,3間に架設
される垂直材7と斜材(ラチス)8とから構成される一
般の小屋トラス1が示されており、この小屋トラス1
は、その両端に設ける鉄骨柱5で支持されている。前記
上弦材2と下弦材3は例えば断面がT字形の型鋼で構成
され、同じく鉄骨柱5は断面がH形の型鋼で構成され
る。
Embodiments of the present invention will now be described with reference to the drawings. 1 to 4 are explanatory views showing the steps of the method according to the first embodiment of the present invention. In the present embodiment, as a concrete example of a hut structure, a general shed truss 1 composed of an upper chord member 2 and a lower chord member 3, and a vertical member 7 and a diagonal member (lattice) 8 which are installed between the upper and lower chord members 2 and 3. Is shown in this hut truss 1
Are supported by steel columns 5 provided at both ends thereof. The upper chord member 2 and the lower chord member 3 are made of, for example, a T-shaped section steel, and the steel column 5 is also made of an H-shaped section steel.

【0011】前記小屋トラス1に固定荷重や積雪荷重が
作用すると、図11の従来例で説明したように中央部が
下に撓み、許容応力を超過する部材が出てくるのでこれ
には補強が必要となる。
When a fixed load or a snow load is applied to the hut truss 1, the central portion bends downward as described in the conventional example of FIG. 11, and some members exceed the allowable stress. Will be needed.

【0012】この場合、従来は前述したように小屋トラ
ス1が変形した状態において上下弦材2,3に補強部材
9を沿わし、溶接で固定しているので、この補強状態に
おいて、固定荷重は小屋トラス1の既設部材が負担し、
補強後に加わる追加荷重は補強部材9と既設部材とで負
担しているため、補強部材9はより強度の大きいものが
必要となり、例えば小屋トラス1の全長に渡る長さの補
強部材9が使用され、溶接作業量も多くなる。
In this case, conventionally, since the reinforcing member 9 is provided along the upper and lower chord members 2 and 3 in the deformed state of the hut truss 1 as described above and is fixed by welding, the fixed load is increased in this reinforcing state. The existing members of the hut truss 1 bear the burden,
Since the additional load applied after the reinforcement is borne by the reinforcing member 9 and the existing member, the reinforcing member 9 needs to have higher strength. For example, the reinforcing member 9 having the length over the entire length of the shed truss 1 is used. The amount of welding work also increases.

【0013】本発明の第1実施例では、補強作業に際
し、まず図2に示されるように、中央部が下向きに撓み
変形した小屋トラス1の下方の床10にジャッキ11を
設置し、このジャッキ11を用いて小屋トラス1の中央
部を持上げ、小屋トラス1をその施工初期状態(つまり
全体が水平な状態)よりさらに持上げる(なお図では上
に凸の湾曲変形は誇張して示されている)。このとき、
小屋トラス1の上弦材2には引張力、下弦材3には圧縮
力が作用して、ジャッキアップ前の下向きの撓み時にお
いて作用していた上弦材2の圧縮力、下弦材3の引張力
は相殺されることになる。
In the first embodiment of the present invention, at the time of reinforcement work, as shown in FIG. 2, first, as shown in FIG. 2, a jack 11 is installed on the floor 10 below the shed truss 1 whose central portion is bent downward and deformed. 11 is used to lift the central portion of the hut truss 1 and further lift the hut truss 1 from the initial state of construction (that is, the state where the entire structure is horizontal) (the upwardly convex curved deformation is exaggerated in the figure). Exist). At this time,
Tensile force acts on the upper chord member 2 of the hut truss 1 and compressive force acts on the lower chord member 3, and the compressive force of the upper chord member 2 and the tensile force of the lower chord member 3 that acted during downward bending before jacking up. Will be offset.

【0014】この持上げ状態で、上弦材2と下弦材3の
両方又は一方に補強用弦材4を当てがい、溶接で固定す
ると固定荷重が小屋トラス1の既設部材と補強用弦材4
の両方に作用する。それにより、補強用弦材4を従来の
補強方法で小屋トラス1に付加する場合に比べてより有
効的に使用でき、その補強量を大幅に低減でき、かつ溶
接等の現場作業も低減できることになる。
In this lifting state, the reinforcing chord member 4 is applied to both or one of the upper chord member 2 and the lower chord member 3 and fixed by welding, so that a fixed load is applied to the existing members of the truss 1 and the reinforcing chord member 4.
Works on both. As a result, it is possible to more effectively use the reinforcing chord member 4 as compared with the case where the reinforcing truss 4 is added to the hut truss 1 by the conventional reinforcing method, and it is possible to significantly reduce the amount of reinforcement and also reduce the on-site work such as welding. Become.

【0015】図5〜図7は第2実施例を示す。この第2
実施例では、小屋トラス1の中央下部に第1実施例の場
合と同様ジャッキ11を当てがい、これにより、下方に
撓んだ小屋トラス1の中央部を上方に持上げたうえ、小
屋トラス1をその両端で支える鉄骨柱5に架構6を設置
して、この鉄骨柱5を補強するものである。つまり、第
2実施例では、小屋トラス1の中央部が撓むということ
は、小屋トラス1を支持しているその両端部の鉄骨柱5
も内側に変形しているという知見にもとづいてなされて
いる。そして前述のとおり小屋トラス1の中央部を持上
げることにより、内側に柱頭変位した鉄骨柱5を垂直状
態にし、この状態で当該鉄骨柱5に架構6を設置してこ
れを補強するものである。
5 to 7 show a second embodiment. This second
In the embodiment, the jack 11 is applied to the lower central part of the hut truss 1 as in the case of the first embodiment, whereby the central part of the hut truss 1 bent downward is lifted upward and the hut truss 1 is lifted. The frame 6 is installed on the steel frame column 5 supported at both ends thereof to reinforce the steel frame column 5. In other words, in the second embodiment, the bending of the central portion of the shed truss 1 means that the steel column 5 at both ends supporting the shed truss 1 is supported.
Is also based on the knowledge that it is deformed inward. Then, by lifting the central portion of the hut truss 1 as described above, the steel frame column 5 having the stigma displaced inward is placed in a vertical state, and in this state, the frame 6 is installed to reinforce the steel frame column 5. .

【0016】前記の架構6は、鉄骨柱5と平行に設置さ
れ、かつこれと同じH形鋼からなる垂直材12と、鉄骨
柱5と垂直材12をつなぐ水平材13及び斜材14とか
らなるトラス構造であって、前記鉄骨柱5の外側に沿わ
せて設けられている。
The frame 6 is composed of a vertical member 12 which is installed in parallel with the steel column 5 and is made of the same H-shaped steel, and a horizontal member 13 and a diagonal member 14 which connect the steel column 5 and the vertical member 12. It is a truss structure and is provided along the outside of the steel column 5.

【0017】第2実施例では、前述のとおり、鉄骨柱5
の外側にトラス構造の架構6を設置することで、鉄骨柱
5の内側への柱頭変位が抑制でき、結果として小屋トラ
ス1の中央部が撓むのを阻止でき、この小屋トラス1で
補強する補強部材が削減できる。さらに、現場作業が小
屋トラス1の両端部に集約されることで、施工コストも
削減可能となる。
In the second embodiment, as described above, the steel column 5
By installing the truss structure frame 6 on the outside of the, the stigma displacement to the inside of the steel column 5 can be suppressed, and as a result, it is possible to prevent the central portion of the hut truss 1 from bending, and to reinforce with the hut truss 1. The number of reinforcing members can be reduced. Further, since the on-site work is concentrated on both ends of the shed truss 1, the construction cost can be reduced.

【0018】図8〜図10は第3実施例を示す。この第
3実施例では、第1実施例と第2実施例の補強方法を組
合わせて実施されている。つまり、下方に撓んだ小屋ト
ラス1の中央部を持上げることで、上弦材トラス2と下
弦材3に下方への撓み時に作用した圧縮力と引張力とを
相殺し、かつ内側に変形した鉄骨柱5の柱頭部変位を元
の位置に戻す。この状態で、小屋トラス1の上下弦材
2,3の一方又は両方に補強用弦材4を固定し、かつ鉄
骨柱5の外側にトラス構造の架構6を設置して前記小屋
トラス1と鉄骨柱5の両方を補強する。
8 to 10 show a third embodiment. In the third embodiment, the reinforcing methods of the first embodiment and the second embodiment are combined. That is, by lifting the central portion of the hut truss 1 which is bent downward, the compressive force and the tensile force applied to the upper chord member truss 2 and the lower chord member 3 at the time of downward bending are canceled and the inner chord member is deformed inward. The column head displacement of the steel column 5 is returned to the original position. In this state, the reinforcing chord member 4 is fixed to one or both of the upper and lower chord members 2 and 3 of the hut truss 1, and the truss structure frame 6 is installed on the outer side of the steel column 5 to install the hut truss 1 and the steel frame. Reinforce both pillars 5.

【0019】このように第3実施例では第1と第2の実
施例の補強方法を組合わせたことにより、補強する範囲
を大幅に低減でき、よって補強材料及び施工のコスト削
減、工程短縮,現場作業の省力化が可能となる。
As described above, in the third embodiment, by combining the reinforcing methods of the first and second embodiments, it is possible to significantly reduce the range of reinforcement, thus reducing the cost of the reinforcing material and construction, shortening the process, It is possible to save labor on site.

【0020】[0020]

【発明の効果】以上説明したように、本発明によると、
小屋トラス1を構成する部材を持上げた状態で補強用弦
材4を上下弦材2,3に固定し、また鉄骨柱5にトラス
構造の架構6を設置して補強を行なうので、この補強方
法によれば以下の効果を奏する。 大スパン構造物の既設建屋の補強に際して、補強部
材を用いての補強量の最小化及び、現場作業の簡素化が
図れる。 小屋トラス1を持上げた状態で、その両端部の鉄骨
柱5に架構6を設置することで、鉄骨柱5の剛性が向上
してその柱頭変位や抑制でき、小屋トラス1の中央部に
発生する応力を低減させることができる。また、現場で
の作業を小屋トラス1の両端部に集約させることから現
場作業の省力化が可能となる。 補強対象の建屋の構造特性を正確に把持し、ジャッ
キアップする量を調整したうえ、前記鉄骨柱5を補強す
ることで、小屋トラス1を構成する部材の現場作業で行
っていた大量の溶接作業による補強を全てなくすことも
可能である。 本発明方法の実施により、従来方法と比較して約3
割程度のコスト削減が図れる。
As described above, according to the present invention,
Since the reinforcing chord member 4 is fixed to the upper and lower chord members 2 and 3 while the members constituting the hut truss 1 are lifted, and the truss structure frame 6 is installed on the steel column 5, the reinforcing method is performed. According to this, the following effects are produced. When reinforcing an existing building with a large span structure, it is possible to minimize the amount of reinforcement by using reinforcing members and to simplify field work. By installing the frame 6 on the steel columns 5 at both ends of the hut truss 1 in a raised state, the rigidity of the steel column 5 can be improved and the stigma displacement and suppression can be suppressed, which occurs in the central part of the hut truss 1. The stress can be reduced. Further, since the work at the site is concentrated at both ends of the hut truss 1, it is possible to save the work at the site. Accurately grasping the structural characteristics of the building to be reinforced and adjusting the amount of jacking up, and reinforcing the steel column 5 to carry out a large amount of welding work that was performed in the field work of the members constituting the hut truss 1. It is also possible to eliminate all reinforcement by. By carrying out the method of the present invention, about 3 times as compared with the conventional method.
Cost reduction can be achieved.

【図面の簡単な説明】[Brief description of drawings]

【図1】第1実施例を説明するため、一般に施工されて
いる小屋トラスを示す正面説明図である。
FIG. 1 is a front view showing a generally-used shed truss for explaining a first embodiment.

【図2】図1の小屋トラスを第1実施例の方法で補強し
ている状態を示す正面説明図である。
FIG. 2 is a front explanatory view showing a state where the hut truss of FIG. 1 is reinforced by the method of the first embodiment.

【図3】補強終了した状態を示す小屋トラスの正面説明
図である。
FIG. 3 is a front explanatory view of the shed truss in a state where reinforcement is completed.

【図4】図3のA−A断面図である。FIG. 4 is a sectional view taken along line AA of FIG. 3;

【図5】第2実施例を説明するため、一般に施工されて
いる小屋トラスを示す正面説明図である。
FIG. 5 is a front explanatory view showing a generally-used shed truss for explaining the second embodiment.

【図6】第2実施例の方法により補強終了した状態を示
す小屋トラスの正面説明図である。
FIG. 6 is a front explanatory view of a shed truss showing a state in which reinforcement is completed by the method of the second embodiment.

【図7】図6のB−B拡大断面図である。FIG. 7 is an enlarged sectional view taken along the line BB of FIG. 6;

【図8】第3実施例を説明するため、一般に施工されて
いる小屋トラスを示す説明図である。
FIG. 8 is an explanatory view showing a generally-used shed truss for explaining the third embodiment.

【図9】図8の小屋トラスを第3実施例の方法で補強し
ている状態を示す正面説明図である。
9 is a front explanatory view showing a state where the hut truss of FIG. 8 is reinforced by the method of the third embodiment.

【図10】第3実施例の方法により補強が終了した状態
を示す小屋トラスの正面説明図である。
FIG. 10 is a front explanatory view of the shed truss showing a state where reinforcement is completed by the method of the third embodiment.

【図11】一般に施工されている小屋トラスの正面説明
図である。
FIG. 11 is a front explanatory view of a generally constructed shed truss.

【図12】図11の小屋トラスを補強した状態の説明図
である。
FIG. 12 is an explanatory view showing a state in which the shed truss shown in FIG. 11 is reinforced.

【図13】図12のC−C断面図である。FIG. 13 is a sectional view taken along line CC of FIG.

【符号の説明】[Explanation of symbols]

1 小屋トラス 2 上弦材 3 下弦材 4 補強用弦材 5 鉄骨柱 6 架構 7 垂直材 8 斜材 9 補強部材 10 床 11 ジャッキ 12 垂直材 13 水平材 14 斜材 1 Hut truss 2 Upper chord member 3 Lower chord member 4 Reinforcement chord member 5 Steel column 6 Frame 7 Vertical member 8 Slanting member 9 Reinforcing member 10 Floor 11 Jack 12 Vertical member 13 Horizontal member 14 Slanting member

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 大スパンを有する既設小屋組みの補強方
法であって、下方に撓んだ小屋トラス1の中央部を持上
げることにより、前記下方に撓んだ状態の小屋トラス1
の上弦材2に作用する圧縮力と下弦材3に作用する引張
力を相殺した状態において、前記上下弦材2,3の両方
又は一方に所定長の補強用弦材4を固定し、前記持上げ
力を解除することにより、建屋の固定荷重を前記補強用
弦材4と、小屋トラス1に作用させることを特徴とする
大スパンを有する既設小屋組みの補強方法。
1. A method of reinforcing an existing shed assembly having a large span, wherein the shed truss 1 is bent downward by raising a central portion of the shed truss 1 which is bent downward.
In a state where the compressive force acting on the upper chord member 2 and the tensile force acting on the lower chord member 3 are offset, a reinforcing chord member 4 having a predetermined length is fixed to both or one of the upper and lower chord members 2 and 3 and is lifted. A method for reinforcing an existing shed having a large span, wherein a fixed load of the building is applied to the reinforcing chord member 4 and the shed truss 1 by releasing the force.
【請求項2】 大スパンを有する既設小屋組みの補強方
法であって、下方に撓んだ小屋トラス1の中央部を持上
げることにより、前記小屋トラス1をその両端位置で支
える内側に柱頭変位した鉄骨柱5を元の垂直位置に調整
し、この状態で、当該鉄骨柱5の外側に沿って、かつ上
下方向に伸長してトラス構造の架構6を設置し、その後
前記小屋トラス1の持上げ力を解除することにより、小
屋トラス1にかかる固定荷重を前記架構6および鉄骨柱
5に作用させることを特徴とする大スパンを有する既設
小屋組みの補強方法。
2. A method of reinforcing an existing roof truss having a large span, wherein the cabin truss 1 which is bent downward is lifted so that the truss 1 is displaced inward to support the truss 1 at both end positions. The steel column 5 is adjusted to its original vertical position, and in this state, the truss structure frame 6 is installed along the outer side of the steel column 5 and extending vertically, and then the lifting force of the shed truss 1 is set. The method for reinforcing an existing shed having a large span is characterized in that a fixed load applied to the shed truss 1 is applied to the frame 6 and the steel column 5 by releasing the above.
【請求項3】 大スパンを有する既設小屋組みの補強方
法であって、下方に撓んだ小屋トラス1の中央部を持上
げることにより、前記下方に撓んだ状態の小屋トラス1
の上弦材2に作用する圧縮力と下弦材3に作用する引張
力を相殺した状態において、前記上下弦材2,3の両方
又は一方に所定長の補強用弦材4を固定すると共に、前
記小屋トラス1をその両端位置で支える内側に柱頭変位
した鉄鋼柱5を元の垂直位置に調整し、当該鉄骨柱5の
外側に沿って、かつ上下方向に伸長してトラス構造の架
構6を設置し、その後、前記小屋トラス1の持上げ力を
解除することにより、建屋の固定荷重を前記補強用弦材
4と、上下弦材2,3を含む小屋トラス1と、架構6お
よび鉄骨柱5に作用させることを特徴とする大スパンを
有する既設小屋組みの補強方法。
3. A method for reinforcing an existing shed structure having a large span, wherein the shed truss 1 is bent downward by raising a central portion of the shed truss 1 which is bent downward.
In a state where the compressive force acting on the upper chord member 2 and the tensile force acting on the lower chord member 3 are offset, a reinforcing chord member 4 having a predetermined length is fixed to both or one of the upper and lower chord members 2 and 3, and Adjust the steel columns 5 that have been displaced to the inner side to support the hut truss 1 at both ends, to the original vertical position, and install the truss structure frame 6 along the outside of the steel column 5 and extending vertically. Then, by releasing the lifting force of the hut truss 1, the fixed load of the building is applied to the reinforcing chord member 4, the hut truss 1 including the upper and lower chord members 2, 3, the frame 6 and the steel column 5. A method for reinforcing an existing shed structure having a large span, which is characterized in that it acts.
JP9591095A 1995-03-30 1995-03-30 Repair method for existing roof truss having large span Withdrawn JPH08270227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9591095A JPH08270227A (en) 1995-03-30 1995-03-30 Repair method for existing roof truss having large span

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9591095A JPH08270227A (en) 1995-03-30 1995-03-30 Repair method for existing roof truss having large span

Publications (1)

Publication Number Publication Date
JPH08270227A true JPH08270227A (en) 1996-10-15

Family

ID=14150453

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9591095A Withdrawn JPH08270227A (en) 1995-03-30 1995-03-30 Repair method for existing roof truss having large span

Country Status (1)

Country Link
JP (1) JPH08270227A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364012A (en) * 2011-05-26 2012-02-29 浙江精工钢结构有限公司 Method for expanding existing large-span truss
CN104675140A (en) * 2015-02-27 2015-06-03 攀钢集团工程技术有限公司 Newly-added bearing column mounting and roof truss load transferring method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364012A (en) * 2011-05-26 2012-02-29 浙江精工钢结构有限公司 Method for expanding existing large-span truss
CN104675140A (en) * 2015-02-27 2015-06-03 攀钢集团工程技术有限公司 Newly-added bearing column mounting and roof truss load transferring method

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