JPH07256471A - Method for joining reinforcing bar - Google Patents
Method for joining reinforcing barInfo
- Publication number
- JPH07256471A JPH07256471A JP7125494A JP7125494A JPH07256471A JP H07256471 A JPH07256471 A JP H07256471A JP 7125494 A JP7125494 A JP 7125494A JP 7125494 A JP7125494 A JP 7125494A JP H07256471 A JPH07256471 A JP H07256471A
- Authority
- JP
- Japan
- Prior art keywords
- thermite
- reinforcing bar
- sleeve
- furnace
- iron
- 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- Withdrawn
Links
Landscapes
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は建築あるいは土木工事に
使用される鉄筋の接続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 method for connecting reinforcing bars used in construction or civil engineering work.
【０００２】[0002]
【従来の技術】鉄筋はコンクリート構造物の強度向上材
として、その多くは軸方向に接続され使用される。接続
方法も重ねて針金で縛る簡単な方法から、ネジ継手、圧
接、溶接、あるいは液相拡散接合等多くの提案、実績が
ある。その簡便な接続方法の１つとして、テルミット溶
接での鉄筋の接続に関する考案が、例えば実公昭４１−
１２２０１号公報に提案されている。2. Description of the Related Art Reinforcing bars are used as strength improving materials for concrete structures, and most of them are connected in the axial direction. There are many proposals and achievements such as screw joints, pressure welding, welding, liquid phase diffusion welding, etc. As one of the simple connecting methods, a device for connecting reinforcing bars by thermite welding has been proposed, for example, in Japanese Utility Model Publication No. 41-
It is proposed in Japanese Patent No. 12201.
【０００３】また溶接技術１９６９年３月号第２５頁に
は図３に示すように鉄筋の接続部にスリーブ８を取付
け、別に設けたテルミット炉１０から湯道６を通じてス
リーブ８と鉄筋１の間に、テルミット炉でのテルミット
反応による溶融金属を流し込み接続する方法が示されて
いる。しかし、これらのテルミットを用いての接続方法
も準備が煩雑、湯道等の消耗材料の価格も高い等の理由
でほとんど普及していない。Further, as shown in FIG. 3, in the welding technology March 1969 issue, page 25, a sleeve 8 is attached to the connecting portion of the reinforcing bar, and a thermite furnace 10 separately provided between the sleeve 8 and the reinforcing bar 1 through the runner 6. Describes a method of pouring and connecting molten metal by a thermite reaction in a thermite furnace. However, the connection method using these thermites is not widely used because preparation is complicated and the cost of consumable materials such as runners is high.
【０００４】[0004]
【発明が解決しようとする課題】しかし、近年、構造物
の大型化に伴い、鉄筋も太径の使用が拡大しつつあり、
また労働力不足、特に溶接技能者の不足は顕著である。
このため、溶接の自動化等、高品質で技能不要な接続方
法の開発が望まれている。この点テルミットによる接続
方法は高度な技能が不要等の利点がある。本発明はテル
ミットによる接続方法で、高品質で、かつ消耗材料を低
減する接続方法を提供することを目的としたものであ
る。However, in recent years, with the increase in size of structures, the use of large diameter reinforcing bars is expanding,
Also, labor shortage, especially welding technician shortage, is remarkable.
Therefore, it is desired to develop a high-quality and skill-free connection method such as automation of welding. In this respect, the connection method using thermite has an advantage that high skill is not required. An object of the present invention is to provide a connecting method using thermite, which has a high quality and reduces consumable materials.
【０００５】[0005]
【課題を解決するための手段】本発明に係わる鉄筋の接
続方法は、鉄筋の接続部にスリーブを取付け、鉄筋とス
リーブの隙間にテルミット剤による溶融金属を流し込む
鉄筋の接続方法において、内面に複数の凸条あるいは凹
溝を有するスリーブの直上にテルミット炉を設け、該テ
ルミット炉におけるテルミット反応による溶融金属で接
続することを特徴とする鉄筋の接続方法である。ここに
おいてテルミット炉は鉄筋が貫通し、鉄筋の周囲を囲む
形状のものであることも特徴とする。またさらにそのテ
ルミット剤はＡｌと酸化鉄の合計が６３〜８７重量％、
鉄粉または鉄粒を１２〜３０重量％を含有することも特
徴とする。According to the method of connecting reinforcing bars according to the present invention, a sleeve is attached to the connecting portion of the reinforcing bars, and a plurality of inner surfaces are connected to each other by pouring molten metal by a thermite agent into a gap between the reinforcing bars. The method of connecting reinforcing bars is characterized in that a thermite furnace is provided directly above the sleeve having the convex stripes or concave grooves and the connection is made with molten metal by the thermite reaction in the thermite furnace. Here, the thermite furnace is also characterized in that it has a shape in which the reinforcing bar penetrates and surrounds the periphery of the reinforcing bar. Further, the thermite agent has a total of 63 to 87% by weight of Al and iron oxide,
It is also characterized by containing 12 to 30% by weight of iron powder or iron particles.
【０００６】[0006]
【作用】まず、本発明は図１に示すように鉄筋１を突合
せ、これにスリーブ２を付け、このスリーブ下端は溶鋼
が流出しないように耐火材３等で封じる。スリーブ直上
には鉄筋が貫通しその周囲を囲む形式のテルミット炉４
を設け、Ａｌ粉と酸化鉄粉を主成分としたテルミット剤
５を燃焼させることで溶融金属ができる。この溶融金属
とスラグ、またガスの分離を行わせる一定時間の滞留を
させた後、テルミット炉底部に設けた止め材を溶融金属
の熱で溶融せしめスリーブと鉄筋の間に溶融金属を注入
する。鉄筋にはコンクリートの接続を強固にするための
突起がある。スリーブの内面にも複数の凹溝、あるいは
凸条を付けることで、より強固な接続ができる。なお、
図２には横向きで接合する場合の事例を示す。側面穴付
きスリーブ７を上部に開口するよう使用し、この直上に
テルミット炉９を設置する。First, according to the present invention, as shown in FIG. 1, rebars 1 are butted, a sleeve 2 is attached to this, and the lower end of this sleeve is sealed with a refractory material 3 or the like so that molten steel does not flow out. A thermite furnace 4 in which the reinforcing bar penetrates directly above the sleeve and surrounds it.
Is provided and the thermite agent 5 containing Al powder and iron oxide powder as main components is burned to form molten metal. After allowing the molten metal and the slag, and the gas to be separated, to stay for a certain period of time, the stopper provided at the bottom of the thermite furnace is melted by the heat of the molten metal, and the molten metal is injected between the sleeve and the reinforcing bar. Reinforcing bars have protrusions to strengthen the concrete connection. By providing a plurality of concave grooves or ridges on the inner surface of the sleeve, a stronger connection can be achieved. In addition,
FIG. 2 shows an example of joining in a horizontal direction. The sleeve 7 with side holes is used so as to open to the upper part, and the thermite furnace 9 is installed immediately above this.
【０００７】従来の方法は図３に示したようにテルミッ
ト反応炉１０は鉄筋１、スリーブ８とは離れた位置にあ
る。この場合、溶融金属を流す湯道６が必要である。こ
れに対して、本発明はテルミット炉はスリーブの直上に
置くだけで、取付けは簡便で、湯道も不要である。な
お、接続部直上でテルミット反応を行わせる考案（実公
昭４１−１２２０１号公報）もあるが、これは溶融接合
を目的としており、本発明と異なる。In the conventional method, as shown in FIG. 3, the thermite reaction furnace 10 is located away from the reinforcing bar 1 and the sleeve 8. In this case, the runner 6 for flowing the molten metal is required. On the other hand, according to the present invention, the thermite furnace is simply placed directly on the sleeve, the mounting is simple, and the runner is not required. There is also a device (Jpn. Pat. Appln. KOKAI Publication No. 41-12201) in which the thermite reaction is carried out immediately above the connection portion, but this is for the purpose of fusion bonding and is different from the present invention.
【０００８】図１に示すように鉄筋を包む形でテルミッ
ト反応を行わせる場合は、テルミット反応で鉄筋そのも
のが溶融する場合がある。そこで、テルミット反応で鉄
筋を損傷させない対策が必要である。テルミット剤に鉄
粉を添加すると反応系を冷却する効果があり、適量添加
することで鉄筋の損傷を防止できる。すなわち、テルミ
ット剤に１２〜３０％の鉄粉、あるいは鉄粒を添加す
る。鉄粉や鉄粒を１２％以上添加すると鉄筋と溶融金属
の間でスラグが固まり鉄筋の損傷を防止する。このとき
鉄筋にレンガ等の耐火材を張付ける、あるいはマグネシ
アクリンカー等を塗布することも煩雑ではあるが、より
鉄筋の損傷を防止できる。しかし、３０％を越える鉄粒
の添加はテルミット反応が安定して維持しない。なお、
鉄粒は鉄を主成分とするもので、切削クズ、あるいは溶
鋼を噴射して粒状にしたアトマイズ粒、あるいは酸化物
からの還元鉄粉等で、必要によってはＣ，Ｓｉ，Ｍｎ，
Ｎｉ，Ｃｒ，Ｍｏ等を含むものでもよい。また複数種の
混合物でもよい。粒のサイズは偏析が少ない等で１０メ
ッシュ以下が好ましい。When the thermite reaction is carried out in the form of wrapping the reinforcing bar as shown in FIG. 1, the reinforcing bar itself may be melted by the thermite reaction. Therefore, it is necessary to take measures to prevent the reinforcing bar from being damaged by the thermite reaction. The addition of iron powder to the thermite agent has the effect of cooling the reaction system, and the addition of an appropriate amount can prevent damage to the reinforcing bar. That is, 12 to 30% of iron powder or iron particles are added to the thermite agent. When 12% or more of iron powder or iron particles is added, slag is solidified between the reinforcing bar and the molten metal to prevent the reinforcing bar from being damaged. At this time, it is complicated to apply a refractory material such as brick to the reinforcing bar or to apply magnesia clinker, but the reinforcing bar can be further prevented from being damaged. However, the addition of iron particles exceeding 30% does not maintain the thermite reaction stably. In addition,
The iron particles are mainly composed of iron, and include cutting scraps, atomized particles formed by spraying molten steel into particles, or reduced iron powder from oxides, etc., and if necessary, C, Si, Mn,
It may contain Ni, Cr, Mo or the like. It may also be a mixture of a plurality of types. The grain size is preferably 10 mesh or less due to less segregation.
【０００９】テルミット剤はＡｌと酸化鉄を混ぜたもの
を６３〜８７重量％含有するものとする。これに点火す
るとＡｌが酸化鉄の酸素で燃焼し、溶融金属が生成す
る。このためＡｌと酸化鉄は燃焼しやすい８メッシュ以
下の粉または粒状のものを使用し、その混合比は酸素量
がバランスするようにする。Ａｌ原料としてはＡｌの板
や棒の切削屑等でよく、酸化鉄はＦｅＯ、Ｆｅ3 Ｏ4 、
Ｆｅ2 Ｏ3 で示されるが、必ずしもこれら純粋なもので
ある必要はなく、通常酸化鉄と呼ばれるもので、Ａｌを
燃焼させるに充分な酸素を含有する鉄鉱石あるいはミル
スケール等が好ましい。The thermite agent contains 63 to 87% by weight of a mixture of Al and iron oxide. When this is ignited, Al burns with oxygen of iron oxide to produce molten metal. For this reason, Al and iron oxide are powders or granules of 8 mesh or less, which are easy to burn, and their mixing ratio is such that the amount of oxygen is balanced. The Al raw material may be aluminum plate or bar cutting waste, and iron oxide may be FeO, Fe 3 O 4 ,
Although it is represented by Fe 2 O 3 , it is not necessarily required to be pure, and iron ore or mill scale which is usually called iron oxide and contains sufficient oxygen to burn Al is preferable.
【００１０】Ａｌと酸化鉄の混合物が６３重量％より少
ないと燃焼が安定して持続しない。また、８７重量％を
越えると燃焼が激しすぎ、テルミット炉内にある鉄筋の
溶損が激しい、またテルミット炉の寿命が短い等があ
り、好ましくない。また、テルミット剤には溶鉄の品質
調整、燃焼補助材、あるいは生成したスラグの融点調整
を目的にＣ，Ｍｎ，Ｓｉ，Ｔｉ，Ｃｒ，Ｎｉ，Ｍｏ，Ｍ
ｇの金属あるいはＭｎ，Ｓｉ，Ｍｇ，Ｃａ，Ｔｉ，Ｎａ
の酸化物を、また、Ｃａ，Ｎａのふっ化物を１〜７重量
％添加する場合もあり、これらと不可避成分を含め１０
重量％以下含有することもできる。If the mixture of Al and iron oxide is less than 63% by weight, combustion does not continue stably. On the other hand, if it exceeds 87% by weight, the combustion is too violent, the rebar in the thermite furnace is severely melted, and the life of the thermite furnace is short. Further, the thermite agent contains C, Mn, Si, Ti, Cr, Ni, Mo, M for the purpose of adjusting the quality of molten iron, a combustion auxiliary material, or adjusting the melting point of the generated slag.
g metal or Mn, Si, Mg, Ca, Ti, Na
1 to 7% by weight of fluorides of Ca and Na may be added.
It may be contained in an amount of not more than wt%.
【００１１】スリーブ２は前述したように内面に複数の
凸条あるいは凹溝１１を有することで強固な接続ができ
る。図４はこの状況を示す半割りにしたスリーブの斜視
図である。溝は螺旋状が加工も比較的容易であり、引張
方向に対しての滑り抵抗もあり好ましい。また、スリー
ブの引張強度が鉄筋のそれより大きい必要があり、鉄筋
と同一材質の場合は断面積が大きくなるようにする。鉄
筋との間隔は鉄筋の偏心、突合せの精度等を考慮して１
〜８ｍｍ程度でよい。スリーブの長さは鉄筋の太さ、引
張強度等の関係で決まるが鉄筋には錆がついている、流
れ込み不良の発生等でロスもあり、４０ｍｍ以上あるこ
とが好ましい。また、スリーブは筒形のものであらかじ
め片方の鉄筋に差込み、その後、鉄筋を突合せればよ
い。As described above, the sleeve 2 has a plurality of convex stripes or concave grooves 11 on the inner surface, so that a strong connection can be achieved. FIG. 4 is a perspective view of a half sleeve showing this situation. It is preferable that the groove has a spiral shape because it is relatively easy to process and has a slip resistance in the pulling direction. In addition, the tensile strength of the sleeve must be greater than that of the reinforcing bar, and if the material is the same as that of the reinforcing bar, the cross-sectional area must be large. Consider the eccentricity of the reinforcing bar, the accuracy of the butt, etc. as the distance to the reinforcing bar 1
It may be about 8 mm. The length of the sleeve is determined by the relationship between the thickness of the reinforcing bar, the tensile strength, etc., but the reinforcing bar is rusted, there is a loss due to the occurrence of inflow failure, etc., and it is preferably 40 mm or more. Further, the sleeve has a tubular shape, and it may be inserted in one of the reinforcing bars in advance and then the reinforcing bars are butted.
【００１２】テルミット炉は鉄製のものでよい。サイズ
は必要溶融金属量が確保できるものとして、図１に示す
ように鉄筋を包み込む場合は分割できるものが取付けが
容易で好ましい。内面はマグネシアクリンカー等の耐火
材でコーティングすると鉄部の損傷がなく寿命の延長が
出来る。The thermite furnace may be made of iron. It is preferable that the size is such that the required amount of molten metal can be secured, and if the reinforcing bar is wrapped as shown in FIG. If the inner surface is coated with a refractory material such as magnesia clinker, the iron part will not be damaged and the life can be extended.
【００１３】[0013]
【実施例】使用した鉄筋はＪＩＳ Ｇ３１１２のＳＤ３
５（ＴＳ＞４９０ＭＰａ）−Ｄ３８（径３８．１ｍ
ｍ）、スリーブは引張強さ４９５ＭＰａの円筒状鋼材で
内面に５ｍｍ間隔で幅３ｍｍ、深さ３ｍｍの溝を付けた
ものを使用した。[Example] The reinforcing bar used is SD3 of JIS G3112.
5 (TS> 490 MPa) -D38 (diameter 38.1 m)
m), the sleeve was made of a cylindrical steel material having a tensile strength of 495 MPa and having an inner surface provided with grooves having a width of 3 mm and a depth of 3 mm at intervals of 5 mm.
【００１４】テルミット炉は５ｍｍ厚の鋼板で図１に示
す２分割できるＶ形とした。テルミット炉の底板は薄板
の上にガラス耐火布を張り作製した。テルミット剤は、
Ａｌ板切削屑、ミルスケール、各種鉄粉、金属Ｍｎ粒、
Ｃ粉、Ｍｇ合金粉、ガラス粉の、粒サイズ１２〜２００
メッシュのものを素材とした。接続後、引張試験および
接続部を開き、接合状況を観察した。表１に以下に説明
する実施例および比較例の結果をまとめて示す。The thermite furnace is a V-shaped steel plate having a thickness of 5 mm which can be divided into two as shown in FIG. The bottom plate of the thermite furnace was made by laminating a glass fireproof cloth on a thin plate. Thermite is
Al plate cutting waste, mill scale, various iron powder, metal Mn particles,
Grain size 12 to 200 of C powder, Mg alloy powder, and glass powder
The material of the mesh was used. After the connection, the tensile test and the connection part were opened, and the joining state was observed. Table 1 collectively shows the results of Examples and Comparative Examples described below.
【００１５】[0015]
【表１】 [Table 1]
【００１６】実施例１は図１に示すように鉄筋１を垂直
にし、これに外径７０ｍｍ、内径４８ｍｍ、長さ１５０
ｍｍのスリーブ２を鉄筋の突合せ部に設置し、下部はマ
グネシア耐火セメント３を塗付け固定した。テルミット
剤はＡｌとミルスケールの割合が２０：８０のＡｌとミ
ルスケール混合物７７％に、さらにアトマイズ鉄粉２０
％、その他としてＣ：１％、Ｍｎ：２％を加え混合し
た。これをスリーブ直上に設置したテルミット炉４に入
れ、花火を使用して点火した。点火後テルミット反応は
安定して進行し、反応終了直後にスリーブ内に溶鋼が注
入された。試験後の引張試験では接続部より離れた位置
で鉄筋破断し、接続部およびテルミット反応させた部分
の鉄筋は損傷もなく問題なかった。実施例２は実施例１
と同様にスリーブは外径６５ｍｍ、内径４５ｍｍ、長さ
１５０ｍｍとし、テルミット剤はＡｌと酸化鉄６３％に
還元鉄粉３０％、その他としてＣ：１％、Ｍｎ：２％、
Ｍｇ：２％、ガラス２％を混合した。点火後のテルミッ
トの燃焼は実施例１よりゆっくりではあったがなんら問
題なく終了し、接続強さも実施例１と何等遜色のないも
のであった。In the first embodiment, as shown in FIG. 1, the reinforcing bar 1 is made vertical, and the outer diameter is 70 mm, the inner diameter is 48 mm, and the length is 150 mm.
The mm sleeve 2 was installed at the butt portion of the reinforcing bar, and the lower part was coated and fixed with magnesia refractory cement 3. The thermite agent is a mixture of Al and mill scale with a ratio of Al and mill scale of 20:80 to 77%, and further atomized iron powder 20.
%, And C: 1% and Mn: 2% as other components were added and mixed. This was placed in a thermite furnace 4 installed directly above the sleeve and ignited using fireworks. After the ignition, the thermite reaction proceeded steadily and molten steel was injected into the sleeve immediately after the reaction was completed. In the tensile test after the test, the reinforcing bar broke at a position distant from the connecting part, and the connecting part and the part subjected to the thermite reaction were not damaged and there was no problem. Example 2 is Example 1
Similarly, the sleeve has an outer diameter of 65 mm, an inner diameter of 45 mm, and a length of 150 mm, the thermite agent is Al and 63% of iron oxide, 30% of reduced iron powder, and other C: 1%, Mn: 2%,
Mg: 2% and glass 2% were mixed. Combustion of the thermite after ignition was slower than that of Example 1, but ended without any problems, and connection strength was comparable to that of Example 1.
【００１７】実施例３も図１に示す構成とし、スリーブ
は内径４２ｍｍとして隙間を狭くした。テルミット剤は
Ａｌとミルスケールを８７％、鉄粒としてステンレス鉄
粒を１２％、その他としてＣ：１％を混合した。なお、
テルミット炉内の鉄筋のテルミット反応で加熱される部
分はマグネシア耐火セメントを薄く塗布し、テルミット
炉内面もマグネシア耐火セメントを張付けた。マグネシ
ア耐火セメントの塗付けとその後の乾燥がやや煩雑であ
ったが、テルミット反応は良好に進行し、スリーブの間
隔が狭いにもかかわらず溶融金属はよく流入した。引張
試験の結果も鉄筋破断で充分なものであった。The third embodiment also has the structure shown in FIG. 1, and the sleeve has an inner diameter of 42 mm to narrow the gap. As the thermite agent, 87% of Al and mill scale, 12% of stainless iron particles as iron particles, and C: 1% as other particles were mixed. In addition,
Magnesia refractory cement was thinly applied to the part of the thermite furnace heated by the thermite reaction, and magnesia refractory cement was also applied to the inner surface of the thermite furnace. The application of magnesia refractory cement and the subsequent drying were a little complicated, but the thermite reaction proceeded well and the molten metal flowed in well despite the narrow sleeve spacing. The result of the tensile test was also sufficient for the fracture of the reinforcing bar.
【００１８】実施例４は図２に示すように鉄筋を横にし
て試験した。スリーブの外形は６角柱で、内側は内径が
４５ｍｍの円形、長さは２００ｍｍとした。６角の１面
の中央部に径２０ｍｍの穴をあけ、鉄筋に穴を上面にし
て取付け後、両端は溶接で封じた。この穴上にテルミッ
ト炉を置いた。テルミット剤は実施例１と同じとした。
これも引張試験の結果、鉄筋部で破断し、継手として問
題のない結果が得られた。Example 4 was tested with the rebar laid down as shown in FIG. The outer shape of the sleeve was a hexagonal column, the inner side was a circle with an inner diameter of 45 mm, and the length was 200 mm. A hole with a diameter of 20 mm was made in the center of one side of the hexagon, and the hole was attached to the reinforcing bar with the hole as the upper surface, and then both ends were sealed by welding. A thermite furnace was placed on this hole. The thermite agent was the same as in Example 1.
As a result of the tensile test, this also broke at the reinforcing bar portion, and a result having no problem as a joint was obtained.
【００１９】比較例５は図３に示すように、スリーブは
外径７０ｍｍ、内径６０ｍｍ、長さ１５０ｍｍで、テル
ミット剤はＡｌとミルスケールを６０％、アトマイズ鉄
粉３５％、その他Ｃ：１％、Ｍｎ：２％、Ｍｇ：２％を
混合した。テルミット反応は専用のテルミット炉を使用
したにもかかわらずなかなか着火せず、また、テルミッ
ト剤が完全に消費されないところで反応が停止した。溶
融金属の流入不良の箇所も発生し、引張試験ではスリー
ブ内でのずれが原因で破断した。湯道はつまりのため１
回の使用だけであった。In Comparative Example 5, as shown in FIG. 3, the sleeve has an outer diameter of 70 mm, an inner diameter of 60 mm and a length of 150 mm, the thermite agent is Al and mill scale 60%, atomized iron powder 35%, and other C: 1%. , Mn: 2% and Mg: 2% were mixed. The thermite reaction did not ignite easily despite the use of a dedicated thermite furnace, and the reaction stopped when the thermite agent was not completely consumed. There were some points where the molten metal failed to flow, and in the tensile test, fracture occurred due to misalignment within the sleeve. The runner is clogged 1
It was only used once.
【００２０】比較例６は実施例２と同じ配置でおこなっ
た。テルミット剤はＡｌとミルスケール９２％、還元鉄
粉５％、その他Ｃ：１％、Ｍｎ：２％ものである。テル
ミット炉内面とテルミット炉内になる鉄筋にはマグネシ
ア系煉瓦の薄板を張付けた。テルミット反応は激しく進
行し、マグネシア煉瓦を張付けたにもかかわらず一部溶
損が発生した。溶融金属の流入は完全であったが、引張
試験ではスリーブ直上のテルミット反応で溶損した部分
の鉄筋が破断した。Comparative Example 6 was carried out in the same arrangement as in Example 2. The thermite agent is Al and mill scale 92%, reduced iron powder 5%, other C: 1%, Mn: 2%. A thin plate of magnesia-based brick was attached to the inner surface of the thermite furnace and the reinforcing bars inside the thermite furnace. The thermite reaction proceeded violently, and some erosion occurred despite the magnesia brick being applied. Although the inflow of molten metal was complete, in the tensile test, the rebar of the portion melted by the thermite reaction immediately above the sleeve broke.
【００２１】[0021]
【発明の効果】本発明を鉄筋、特に太い直径の鉄筋の接
続に使用すると溶接等の高度な技能や、高度な設備が必
要なく、また、ネジ接続のような専用の鉄筋も必要な
く、簡便にできる。また、鉄筋の突合せ精度も高いもの
は必要なく、また、接続時の押付け等が必要ないため、
工場での仮組も大型に強固にできる等で現地作業の高能
率化が図れる。これらから工費低減、工期の短縮も可能
であり、土木・建築での大きな効果がある。EFFECTS OF THE INVENTION When the present invention is used to connect rebars, particularly rebars with a large diameter, it does not require advanced skills such as welding or advanced equipment, and does not require dedicated rebars such as screw connections. You can Also, it is not necessary to have a high rebar butt accuracy, and since there is no need for pressing when connecting,
The temporary assembly in the factory can be made large and strong, and the efficiency of local work can be improved. From these, construction cost can be reduced and construction period can be shortened, which has a great effect in civil engineering and construction.
【図１】鉄筋にスリーブを取付けた斜視図FIG. 1 is a perspective view in which a sleeve is attached to a reinforcing bar.
【図２】鉄筋を横向きに接続するときの斜視図FIG. 2 is a perspective view when the reinforcing bars are connected sideways.
【図３】従来技術の例を示す斜視図FIG. 3 is a perspective view showing an example of a conventional technique.
【図４】本発明に使用するスリーブの斜視図FIG. 4 is a perspective view of a sleeve used in the present invention.
１ 鉄筋 ２，８ スリーブ ３ 耐火材 ４，９，１０ テルミット炉 ５ テルミット剤 ６ 湯道 ７ 側面穴付きスリーブ 1 Reinforcing bar 2,8 Sleeve 3 Refractory material 4,9,10 Thermit furnace 5 Thermit agent 6 Runway 7 Sleeve with side hole
Claims (3)
とスリーブの隙間にテルミット剤による溶融金属を流し
込む鉄筋の接続方法において、内面に複数の凸条あるい
は凹溝を有するスリーブの直上にテルミット炉を設け、
該テルミット炉におけるテルミット反応による溶融金属
で接続することを特徴とする鉄筋の接続方法。1. A method for connecting rebars in which a sleeve is attached to a connecting portion of the rebars and molten metal is poured into the gap between the rebars and the sleeve by a thermite agent, in which the thermite furnace has a plurality of ridges or grooves on its inner surface. Is provided
A method for connecting reinforcing bars, characterized in that connection is made with molten metal by a thermite reaction in the thermite furnace.
囲を囲む形状のものであることを特徴とする請求項１に
記載の鉄筋の接続方法。2. The method of connecting rebars according to claim 1, wherein the thermite furnace has a shape in which the rebar penetrates and surrounds the periphery of the rebar.
３〜８７重量％、鉄粉または鉄粒を１２〜３０重量％含
有することを特徴とする請求項１または２に記載の鉄筋
の接続方法。3. The thermite agent has a total amount of Al and iron oxide of 6
3 to 87% by weight and 12 to 30% by weight of iron powder or iron particles are contained, The method of connecting reinforcing bars according to claim 1 or 2, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7125494A JPH07256471A (en) | 1994-03-17 | 1994-03-17 | Method for joining reinforcing bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7125494A JPH07256471A (en) | 1994-03-17 | 1994-03-17 | Method for joining reinforcing bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07256471A true JPH07256471A (en) | 1995-10-09 |
Family
ID=13455398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7125494A Withdrawn JPH07256471A (en) | 1994-03-17 | 1994-03-17 | Method for joining reinforcing bar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07256471A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100779764B1 (en) * | 2007-07-16 | 2007-11-27 | 박형국 | Steel bar vertical joint structure and vertical joint method of the steel bar |
| CN108963480A (en) * | 2018-05-25 | 2018-12-07 | 广东电网有限责任公司 | A kind of grounding body and preparation method thereof |
-
1994
- 1994-03-17 JP JP7125494A patent/JPH07256471A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100779764B1 (en) * | 2007-07-16 | 2007-11-27 | 박형국 | Steel bar vertical joint structure and vertical joint method of the steel bar |
| CN108963480A (en) * | 2018-05-25 | 2018-12-07 | 广东电网有限责任公司 | A kind of grounding body and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3234603A (en) | Butt joining of steel bars and the like | |
| CN103252597B (en) | Hot-setting backing welding flux and preparation method thereof | |
| US4683011A (en) | High penetration, high speed, agglomerated welding flux | |
| CA2213903C (en) | Process for the aluminothermic welding of rails with alloying of the weld metal in the rail head region | |
| JP2009062601A (en) | Molten pig iron tapping hole structure in melting furnace, and repairing method therefor | |
| JPH07256471A (en) | Method for joining reinforcing bar | |
| CA2214054C (en) | Process for the aluminothermic welding of rails with alloying of the weld metal in the rail head region | |
| CN209397712U (en) | The connection structure of antidetonation steel pipe in a kind of shear wall | |
| US4257990A (en) | Refractory materials | |
| JPH116007A (en) | Refractory excellent in refractoriness and formability for converter slag cutting and dart for slag cutting using this refractory | |
| JP2577527Y2 (en) | Backing members for welded joints of reinforcing bars | |
| JPH03180295A (en) | Backing material for welding deformed steel bar made of sintered ceramics | |
| CN214640991U (en) | Sleeve welding joint for connecting vertical steel bars | |
| JP2001314970A (en) | Sub-merged arc press welding method for high strength reinforcing bar having excellent weld portion quality | |
| CN214602499U (en) | Vertical steel bar welding device | |
| SU1232440A1 (en) | Method of producing alloyed metal | |
| CN208800551U (en) | Roll sleeve and roll | |
| CN215598060U (en) | Shear fracture resistant anchoring piece for rotary kiln castable masonry | |
| KR101359210B1 (en) | Cement mixture, panel by using it and method for constructing floor structure by using it | |
| CN115351457A (en) | Multi-section welding flux, self-preheating multi-section electroless welding rod and preparation method thereof | |
| JPS59184777A (en) | Pressure welding of ceramic member to metal member | |
| JP2003094180A (en) | Treatment method for pile head of steel pipe pile | |
| JPH0468293A (en) | Anchor brick for supporting refractory lining and refractory lining supporting structure | |
| JPS5918503B2 (en) | Rebar joint method and equipment | |
| JPS58535B2 (en) | Ikeitetsu Kinko Subno Ketsusetshouhou |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010605 |