JPS6035506B2 - Shear reinforcement method for openings in reinforced concrete beams - Google Patents
Shear reinforcement method for openings in reinforced concrete beamsInfo
- Publication number
- JPS6035506B2 JPS6035506B2 JP9327778A JP9327778A JPS6035506B2 JP S6035506 B2 JPS6035506 B2 JP S6035506B2 JP 9327778 A JP9327778 A JP 9327778A JP 9327778 A JP9327778 A JP 9327778A JP S6035506 B2 JPS6035506 B2 JP S6035506B2
- Authority
- JP
- Japan
- Prior art keywords
- reinforced concrete
- hole
- concrete beam
- opening
- openings
- 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.)
- Expired
Links
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】
本発明は、建造物等の構造体の既に構築された鉄筋コン
クリートの梁に設ける関口部のせん断補強方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shear reinforcing method for a gateway section provided in a reinforced concrete beam of a structure such as a building.
一般に開□部を有する構造部材が外力を受けると、開口
部の周辺では応力集中が起るものであり、例えば、円孔
を持つ弾性無限板が一様のせんを受ける場合には円孔縁
の斜張縁の斜張力は円しから充分離れた位置におけるそ
れの４倍にも達するものである。Generally, when a structural member with an opening is subjected to an external force, stress concentration occurs around the opening.For example, when an elastic infinite plate with a circular hole is subjected to uniform shearing, the edge of the circular hole The diagonal tension at the diagonal edge of the circle is four times that at a position sufficiently far away from the circle.
このため、建造物の構造体において、鉄筋コンクリート
の梁に設備配管用等の開□部である貫通横孔を設ける場
合には、貫通榛孔の位置をせん断力の特に小さいスパン
の中央附近にするなどの配慮をすると共にコンクリート
の打設前に予め鉄筋や鋼板等を用いて型枠内の関口部を
形成する部位の周辺に斜張力に対する必要な補強を施す
のが普通である。しかし、鉄筋コンクリートの梁の構築
後において、設備設計の変更等によって関口部の位置の
変更、又は新たに関口部の必要が生ずることが屡々ある
ものである。For this reason, when providing horizontal through holes for equipment piping, etc. in reinforced concrete beams in building structures, the position of the through holes should be near the center of the span where shear force is particularly low. In addition to taking these considerations into account, it is common practice to provide necessary reinforcement against diagonal tension around the part of the formwork that will form the entrance using reinforcing bars, steel plates, etc. before pouring concrete. However, after constructing a reinforced concrete beam, it is often necessary to change the position of the entrance or create a new entrance due to changes in equipment design, etc.
本発明は、上記した既に構築された鉄筋コンクリートの
梁に必要から閉口部を設ける場合に、この関口部のせん
断補強を有効かつ容易確実に行うことができる方法を提
供するものである。The present invention provides a method that can effectively, easily and reliably perform shear reinforcement of a closed section when a closed section is provided as necessary in the already constructed reinforced concrete beam described above.
以下に本発明の方法を第１図及び第２図に示す実施例に
よって説明すると、本発明の方法は構造体の既に構築さ
れた鉄筋コンクリートの梁１の所要位置に、穿孔機によ
って貫通横孔２を穿孔して開□部２′を設け、上記の貫
通横孔２の周辺のコンクリート７中に堅方向の圧縮プレ
ストレスを導入するもので、この圧縮プレストレスの導
入は、貫通横孔２に臨む鉄筋コンクリートの梁１の上、
下面にそれぞれ並列する２本のアンカー鋼材３を当接し
、梁１の両側面に沿ってそれぞれ上記の関口部２′をは
さんで堅方向に設ける２本のＰＣ鋼棒４の上、下端を、
それぞれ上記のアンカー鋼材３の両端部にナット５で緊
張定着することによって行われる。The method of the present invention will be explained below with reference to the embodiment shown in FIGS. is drilled to form an opening 2', and compressive prestress in the rigid direction is introduced into the concrete 7 around the horizontal through hole 2. Above the reinforced concrete beam 1,
Two anchor steel rods 3 parallel to each other are brought into contact with the lower surface, and the upper and lower ends of two PC steel rods 4, which are provided in the stiff direction along both sides of the beam 1, sandwiching the above-mentioned entrance part 2', are attached. ,
This is done by tension-fixing nuts 5 to both ends of the anchor steel material 3, respectively.
又、第３図及び第４図に示す実施例では、上記の圧縮プ
レストレスの導入は、穿孔した上記の貫通横孔２の両側
に該貫通機孔２を近く梁１に更にＰＣ鋼棒の貫通堅孔６
を穿孔し、この貫通堅孔６にＰＣ鋼棒４を挿通し、その
上、下端をナット５によって梁１の上、下面に緊張定着
することによって行われる。なお図面において８はアン
カー鋼材３及びアンカープレード９の下部の梁のコンク
リート面に施工されるならしモルタルである。本発明の
方法は上記の如くであって、既に構築された鉄筋コンク
リートの梁１に穿孔された貫通機孔２の周辺のコンクリ
ート中に、ＰＣ鋼棒４の緊張定着によって堅方向の圧縮
プレストレスが導入されるから、鉄筋コンクリートの梁
１が受けるせん断力によって関口部２′である貫通横孔
２の周辺に集中的に生ずる大きい斜張力に対して、上記
の堅方向の圧縮プレストレスは有効に抵抗できることと
なり、本願発明の方法は鉄筋コンクリ−トの梁１に設け
られた開□部１′のせん断補強を容易正確に施工出来る
ものである。In addition, in the embodiment shown in FIGS. 3 and 4, the introduction of the compressive prestress is achieved by placing the through-holes 2 close to both sides of the drilled through-hole 2 on the beam 1. Through hole 6
This is done by drilling a hole, inserting the PC steel rod 4 into the solid through hole 6, and fixing the lower end of the rod under tension to the upper and lower surfaces of the beam 1 with nuts 5. In the drawings, reference numeral 8 denotes leveling mortar applied to the concrete surface of the lower beam of the anchor steel 3 and the anchor plate 9. The method of the present invention is as described above, and compressive prestress in the stiff direction is created in the concrete around the penetrating hole 2 drilled in the already constructed reinforced concrete beam 1 by tension anchoring of the PC steel rod 4. As a result, the compressive prestress in the rigid direction effectively resists the large diagonal tension that is concentrated around the through-hole 2, which is the entrance part 2', due to the shear force that the reinforced concrete beam 1 receives. Therefore, the method of the present invention can easily and accurately perform shear reinforcement of the open square portion 1' provided in the reinforced concrete beam 1.
なお、上記した第３図及び第４図に示す堅方向の圧縮プ
レストレスの導入は、ＰＣ鋼棒４は梁１のコンクリート
中に埋設されることとなり、構造体の耐火上に有利であ
る。Note that the introduction of the compressive prestress in the hard direction shown in FIGS. 3 and 4 described above is advantageous in terms of fire resistance of the structure because the PC steel rod 4 is buried in the concrete of the beam 1.
添付の図面は、本発明の方法の態様を実施例によって説
明するもので、第１図は本発明を実施した鉄筋コンクリ
ートの梁の要部の正面図、第２図は前図におけるＡ−Ａ
線に沿う縦断面図である。
つぎに第３図及び第４図は他の実施例を示すもので、第
３図は同じく鉄筋コンクリートの梁の要部の正面図、第
４図は前図のＢ−Ｂ線に沿う縦断図である。１・・・・
・・鉄筋コンクリートの梁、２…・・・貫通横孔、２′
…・・・開□部、３・・・・・・アンカー鋼材、４…・
・・ＰＣ鋼棒、５・・・・・・ナット、６・・…・貫通
堅孔、７……コンクリート、８……ならしモルタル、９
……アンカープレート。
第１図
第２図
第３図
第４図The attached drawings are for explaining aspects of the method of the present invention by way of examples, and FIG. 1 is a front view of the main part of a reinforced concrete beam in which the present invention was implemented, and FIG. 2 is a view taken along A-A in the previous figure.
It is a longitudinal cross-sectional view along a line. Next, Figures 3 and 4 show other embodiments. Figure 3 is a front view of the main part of the same reinforced concrete beam, and Figure 4 is a longitudinal sectional view taken along line B-B in the previous figure. be. 1...
...Reinforced concrete beam, 2...Through horizontal hole, 2'
...Opening part, 3...Anchor steel material, 4...
...PC steel bar, 5... Nut, 6... Through-hole, 7... Concrete, 8... Leveling mortar, 9
...anchor plate. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
て貫通横孔を穿孔して開口部を設け、該貫通横孔の周辺
のコンクリート中に堅方向の圧縮プレストレスを導入す
ることを特徴とする鉄筋コンクリートの梁に設ける開口
部のせん断補強方法。 ２ 上記の貫通横孔に臨む鉄筋コンクリートの梁の上、
下にそれぞれ並列する２本のアンカー鋼材を当接し、上
記の梁の両側面に沿つてそれぞれ上記の開口部をはさん
で堅方向に配する２本のＰＣ鋼棒の上、下端を、それぞ
れ上記のアンカー鋼材の両端部にナツトで緊張定着めし
めることを特徴とする上記の特許請求の範囲１に記載の
鉄筋コンクリートの梁に設ける開口部のせん断補強方法
。 ３ 上記の貫通横孔の両側に該貫通横孔に近く鉄筋コン
クリートの梁にＰＣ鋼棒の挿通堅孔を穿孔し、この挿通
堅孔にＰＣ鋼棒を挿通し、その上、下端をナツトによつ
て梁の上、下面に緊張定着めしめることを特徴とする上
記の特許請求の範囲１に記載の鉄筋コンクリートの梁に
設ける開口部のせん断補強方法。[Scope of Claims] 1. A through-hole is bored at a predetermined position in a reinforced concrete beam using a drilling machine to form an opening, and compressive prestress in a hard direction is introduced into the concrete around the through-hole. A shear reinforcement method for openings in reinforced concrete beams. 2. On the reinforced concrete beam facing the above-mentioned through-hole,
Abut the two parallel anchor steels below, and connect the upper and lower ends of the two PC steel rods arranged in the rigid direction along both sides of the beam, sandwiching the above opening, respectively. The shear reinforcing method for an opening provided in a reinforced concrete beam according to claim 1, characterized in that the anchor steel material is tension-fixed to both ends with nuts. 3. Drill hard holes for inserting the PC steel rod into the reinforced concrete beam near the horizontal through hole on both sides of the horizontal through hole, insert the PC steel rod into the hard insertion hole, and tighten the upper and lower ends with nuts. 2. A shear reinforcing method for an opening in a reinforced concrete beam according to claim 1, characterized in that the beam is tension-fixed to the upper and lower surfaces of the beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9327778A JPS6035506B2 (en) | 1978-07-31 | 1978-07-31 | Shear reinforcement method for openings in reinforced concrete beams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9327778A JPS6035506B2 (en) | 1978-07-31 | 1978-07-31 | Shear reinforcement method for openings in reinforced concrete beams |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5520818A JPS5520818A (en) | 1980-02-14 |
| JPS6035506B2 true JPS6035506B2 (en) | 1985-08-15 |
Family
ID=14077931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9327778A Expired JPS6035506B2 (en) | 1978-07-31 | 1978-07-31 | Shear reinforcement method for openings in reinforced concrete beams |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6035506B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH657803A5 (en) * | 1982-01-16 | 1986-09-30 | Hauni Werke Koerber & Co Kg | Grinding machine |
| JPH0214914Y2 (en) * | 1985-01-29 | 1990-04-23 | ||
| JPS62246449A (en) * | 1986-04-17 | 1987-10-27 | Okuma Mach Works Ltd | Nc lathe provided with tool magazine |
| JPS62255035A (en) * | 1986-04-22 | 1987-11-06 | Hokoku Kikai Kk | Turret-style machining center |
| JPH09529U (en) * | 1992-03-26 | 1997-10-31 | ホーコス株式会社 | Turret type machining center |
-
1978
- 1978-07-31 JP JP9327778A patent/JPS6035506B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5520818A (en) | 1980-02-14 |
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