JPH028431A - Manufacture of box culvert - Google Patents
Manufacture of box culvertInfo
- Publication number
- JPH028431A JPH028431A JP11978189A JP11978189A JPH028431A JP H028431 A JPH028431 A JP H028431A JP 11978189 A JP11978189 A JP 11978189A JP 11978189 A JP11978189 A JP 11978189A JP H028431 A JPH028431 A JP H028431A
- Authority
- JP
- Japan
- Prior art keywords
- box culvert
- steel
- steel bar
- displacement
- steel bars
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 238000004873 anchoring Methods 0.000 claims abstract description 5
- 239000004567 concrete Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 7
- 238000009415 formwork Methods 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 2
- IIBYAHWJQTYFKB-UHFFFAOYSA-N bezafibrate Chemical compound C1=CC(OC(C)(C)C(O)=O)=CC=C1CCNC(=O)C1=CC=C(Cl)C=C1 IIBYAHWJQTYFKB-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Sewage (AREA)
- Rod-Shaped Construction Members (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は地下排水路等の構築に使われるコンクリート製
のボックスカルバートであって、内部にＰＣ鋼棒を入れ
て強度補強したボックスカルバートの製造法の改良に関
する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a concrete box culvert used for constructing underground drainage channels, etc., and is manufactured by reinforcing the strength by inserting PC steel rods inside the box culvert. Concerning improvements in law.
従来、コンクリート製のボックスカルバートにおいて頂
版部（２）と底版部（３）のコンクリート厚みを減らす
ため、鉄筋（７）の他にＰＣ鋼棒（１）を第３，４図に
示す様にボックスカルバートの頂版部（２）と底版部（
３）に相当する型枠内部に配設し、その後型枠内にコン
クリートを打ち込み、コンクリートが３００＆ｙ ／
ｃａ程度以上の圧縮強さに硬化した時点でＰＣ鋼棒に引
張応力を与えて強度補強するコンクリート製ボックスカ
ルバートが広く知られている。第３図に示すＰＣ鋼棒の
配設方法は直線状のＰＣ鋼棒（１）をボックスカルバー
ト（４）の断面中心線（５）よりやや内側に配設する方
法である。又第４図に示すＰＣ鋼棒の配設方法は内側に
向がっ士湾曲したＰＣ鋼棒（１）をその左右の定着部（
６）が断面中心線（５）上に位置する状態に配置する例
である。Conventionally, in order to reduce the concrete thickness of the top slab (2) and bottom slab (3) of concrete box culverts, PC steel bars (1) were used in addition to reinforcing bars (7) as shown in Figures 3 and 4. Box culvert top slab (2) and bottom slab (
Place it inside the formwork corresponding to 3), then pour concrete into the formwork, and the concrete becomes 300&y/y.
Concrete box culverts are widely known in which tensile stress is applied to PC steel bars to strengthen them once they have hardened to a compressive strength of approximately ca or more. The PC steel rod arrangement method shown in FIG. 3 is a method in which a straight PC steel rod (1) is arranged slightly inside the cross-sectional center line (5) of the box culvert (4). In addition, the method of arranging the PC steel rods shown in Fig. 4 is to place the inwardly curved PC steel rod (1) at its left and right fixing parts (
6) is placed on the cross-sectional center line (5).
この従来のＰＣ鋼棒の配設方法ては、第６図の実線及び
第５図点線で示す様にＰＣ鋼棒による内部曲げモーメン
トが側壁上部において大きく残存しているため、工場製
造の段階で側壁部内側上方に引張及び割れのクラック（
８）が生じるという問題点があった。In this conventional PC steel bar arrangement method, as shown by the solid line in Fig. 6 and the dotted line in Fig. 5, a large internal bending moment due to the PC steel bar remains at the upper part of the side wall. Tensile and cracks (
8) occurs.
本発明の課題は、従来のこれらの問題点を解消したボッ
クスカルバートの製造法の提供にある。An object of the present invention is to provide a method for manufacturing a box culvert that eliminates these conventional problems.
本発明はかかる問題点を解決し、クラックの発生ノナイ
ボツクスカルバートの製造法を提供せんとするものであ
り、その要旨は、ＰＣ鋼棒（１）をボックスカルバート
の頂版部（２）及び底版部（３）に相当する型枠内に配
設し、その後型枠内にコンクリートを打ら込み、コンク
リートが所定の圧縮強さ以上に硬化した時点でＰＣ鋼棒
に引張応力を与えて強度補強するコンクリート製ボック
スカルバート（４）の製造法に於いて、型枠内に配設す
るＰＣ鋼棒（１）を内側に向けて湾曲させ、しかもｐｃ
ｍ棒（１）の中央のボックスカルバートの断面中心線（
５）からの内側変位量ｅ２がＰＣ鋼棒（１）の左右の定
着部（６）の外側変位量ｅ１の０．５乃至１．５倍の範
囲としたことを特徴とするボックスカルバートの製造法
ｔこある。第１図は本発明のＰＣ鋼棒の実際の配設状態
を示し、第２図は本発明のＰＣ鋼棒の湾曲と変位を示す
説明図である。The present invention aims to solve such problems and provide a method for manufacturing a box culvert in which cracks occur. Place it in a formwork corresponding to part (3), then concrete is poured into the formwork, and when the concrete hardens to a predetermined compressive strength or higher, tensile stress is applied to the PC steel bar to strengthen it. In the manufacturing method of a concrete box culvert (4), the PC steel rods (1) arranged in the formwork are curved inward, and
The cross-sectional center line of the box culvert at the center of m bar (1) (
5) Manufacture of a box culvert characterized in that the inner displacement e2 from the PC steel bar (1) is in the range of 0.5 to 1.5 times the outer displacement e1 of the left and right anchoring parts (6) of the PC steel bar (1). There is a law. FIG. 1 shows the actual arrangement of the PC steel bar of the present invention, and FIG. 2 is an explanatory diagram showing the curvature and displacement of the PC steel bar of the present invention.
この発明では頂版部（２）と底版部（３）とにＰＣ鋼棒
（１）を配設したことによって、従来通リポツクスカル
バートの強度を高め外部荷重に充分に耐える構造として
そのコンクリート厚みを減らすことができた。しかも、
ＰＣ鋼棒（１）を湾曲させ、その定着部（６）の外側変
位量ｅ２をその中央の内側変位量ｅ１の０．５〜１．５
倍としたことによって、第５図実線に示す様にボックス
カルバートの側壁上部に作用する曲ケモーメント値Ｍ２
を第４図に示す従来の湾曲ＰＣ鋼棒の場合の曲げモーメ
ント値Ｍ１の１／４程度にすることがてき、よって製造
段階で発生するクラック（８）？なくすことがてきた。In this invention, by arranging the PC steel rods (1) in the top slab part (2) and the bottom slab part (3), the strength of the lipox culvert is increased and the concrete thickness is increased to have a structure that can sufficiently withstand external loads. was able to reduce Moreover,
The PC steel bar (1) is curved, and the outer displacement e2 of the anchoring part (6) is 0.5 to 1.5 of the inner displacement e1 of the center.
By doubling it, the bending moment value M2 acting on the upper side wall of the box culvert is as shown by the solid line in Figure 5.
can be reduced to about 1/4 of the bending moment value M1 of the conventional curved PC steel bar shown in FIG. I've been able to get rid of it.
即ち本発明では外部荷重のもっとも大きく作用する頂版
部（２）。That is, in the present invention, the top plate portion (2) is where the largest external load acts.
底版部（３）の中央での最大曲げモーメントを相殺すべ
くＰＣ鋼棒ｆｌ）によって必要な中央の曲げモーメント
値Ｍ。を従来のｐｃｍ棒を同様に得ながらその側壁上部
におけるＰＣ鋼棒による曲げモーメント値を大巾に低下
させることができ、よってコンクリート厚みを減らすと
いう目的とクラ・ツクを発生させないという目的を同時
に達成できたものである。本発明では８２：ｅｌ程度の
変位において良好な結果を得ることができた。The central bending moment value M required by the PC steel bar fl) to offset the maximum bending moment at the center of the bottom plate (3). While obtaining a conventional PCM bar in the same way, the bending moment value due to the PC steel bar at the upper part of the side wall can be greatly reduced, thus simultaneously achieving the purpose of reducing concrete thickness and preventing cracks from occurring. It was made. In the present invention, good results could be obtained at a displacement of about 82:el.
尚第６図に第３図に示す直線状ＰＣ鋼棒の場合の曲げモ
ーメントを実線で、又外部荷重による曲げモーメントを
点線で示している。In FIG. 6, the bending moment for the straight PC steel bar shown in FIG. 3 is shown by a solid line, and the bending moment due to an external load is shown by a dotted line.
以上の様ンこ本発明によれば、ＰＣ鋼棒によってコンク
リート厚みを減らしながら、ｐｃｍ棒のため製造段階で
従来発生していたクラックをなくすことができたという
優れた効果がある。As described above, the present invention has an excellent effect in that it is possible to reduce the concrete thickness by using the PC steel rod and to eliminate the cracks that conventionally occur during the manufacturing stage due to the PCM rod.
第１図は本発明のポ・ツクスカルバートを示す縦断面図
、第２図は同発明のＰＣ鋼棒の配設状態を示す説明図、
第３，４図は従来のボ・シクスカ／レバートのＰＣ鋼棒
の配設状態を示す説明図、第５図は本発明と従来の湾曲
したＰＣ鋼棒による曲げモーメント比較図、第６図は従
来の直線状ＰＣ鋼棒による曲げモーメント作用図である
。
（１）：ＰＣ鋼棒 （２）二項版部（３）：ｌｌ
ｌＥ版部（４） ：ボックスカルバート（５）：断面中
心線 （６）：定着部（７）：鉄筋 （
８）： クラ・ノクψ
ψ（Ｎ
凶FIG. 1 is a longitudinal cross-sectional view showing the pot culvert of the present invention, FIG. 2 is an explanatory diagram showing the arrangement state of the PC steel bars of the invention,
Figures 3 and 4 are explanatory diagrams showing the arrangement of conventional Bo-Sikuska/Levert PC steel bars, Figure 5 is a comparison diagram of bending moments between the present invention and conventional curved PC steel bars, and Figure 6 is It is a bending moment effect diagram by a conventional straight PC steel bar. (1): PC steel rod (2) Second section (3): ll
lE version part (4) : Box culvert (5) : Section center line (6) : Anchor part (7) : Rebar (
8): Kura Noku ψ ψ (N)
Claims (1)
）及び底版部（３）に相当する型枠内に配設し、その後
型枠内にコンクリートを打ち込み、コンクリートが所定
の圧縮強さ以上に硬化した時点でＰＣ鋼棒に引張応力を
与えて強度補強するコンクリート製ボックスカルバート
（４）の製造法に於いて、型枠内に配設するＰＣ鋼棒（
１）を内側に向けて湾曲させ、しかもＰＣ鋼棒（１）の
中央のボックスカルバートの断面中心線（５）からの内
側変位量ｅ＿２がＰＣ鋼棒（１）の左右の定着部（６）
の外側変位量ｅ＿１の０．５乃至１．５倍の範囲とした
ことを特徴とするボックスカルバートの製造法。1) Attach the PC steel rod (1) to the top section of the box culvert (2).
) and bottom slab (3), then concrete is poured into the formwork, and when the concrete hardens to a predetermined compressive strength or higher, tensile stress is applied to the PC steel bar to increase its strength. In the manufacturing method of reinforced concrete box culvert (4), PC steel rods (
1) is curved inward, and the inward displacement e_2 from the cross-sectional center line (5) of the box culvert at the center of the PC steel bar (1) is the left and right anchoring portions (6) of the PC steel bar (1).
A method for manufacturing a box culvert, characterized in that the outer displacement e_1 is in a range of 0.5 to 1.5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11978189A JPH028431A (en) | 1989-05-11 | 1989-05-11 | Manufacture of box culvert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11978189A JPH028431A (en) | 1989-05-11 | 1989-05-11 | Manufacture of box culvert |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH028431A true JPH028431A (en) | 1990-01-11 |
| JPH0325569B2 JPH0325569B2 (en) | 1991-04-08 |
Family
ID=14770066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11978189A Granted JPH028431A (en) | 1989-05-11 | 1989-05-11 | Manufacture of box culvert |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH028431A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100800308B1 (en) * | 2006-08-17 | 2008-02-01 | 홍석희 | Camber prestressed precast box with the unit prestressed precast box with camber prestress introduced longitudinally and integrally installed and its installation method |
| JP2019183411A (en) * | 2018-04-03 | 2019-10-24 | 旭コンクリート工業株式会社 | Junction coupler, box culvert, construction method of box culvert |
-
1989
- 1989-05-11 JP JP11978189A patent/JPH028431A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100800308B1 (en) * | 2006-08-17 | 2008-02-01 | 홍석희 | Camber prestressed precast box with the unit prestressed precast box with camber prestress introduced longitudinally and integrally installed and its installation method |
| JP2019183411A (en) * | 2018-04-03 | 2019-10-24 | 旭コンクリート工業株式会社 | Junction coupler, box culvert, construction method of box culvert |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0325569B2 (en) | 1991-04-08 |
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