JPH0325569B2 - - Google Patents
Info
- Publication number
- JPH0325569B2 JPH0325569B2 JP11978189A JP11978189A JPH0325569B2 JP H0325569 B2 JPH0325569 B2 JP H0325569B2 JP 11978189 A JP11978189 A JP 11978189A JP 11978189 A JP11978189 A JP 11978189A JP H0325569 B2 JPH0325569 B2 JP H0325569B2
- Authority
- JP
- Japan
- Prior art keywords
- box culvert
- concrete
- steel bar
- steel
- formwork
- 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
- Sewage (AREA)
- Rod-Shaped Construction Members (AREA)
- Reinforcement Elements For Buildings (AREA)
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
リート製のボツクスカルバートであつて、内部に
PC鋼棒を入れて強度補強したボツクスカルバー
トの製造法の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a concrete box culvert used for constructing underground drainage channels, etc.
This paper relates to an improvement in the manufacturing method of box culverts whose strength is reinforced by inserting prestressed steel rods.
従来、コンクリート製のボツクスカルバートに
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
図に示す様にボツ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
300Kg／cm2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
リート製ボツ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をボツクスカルバート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かつて湾曲
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 part 2 and bottom slab part 3 in a concrete box culvert, in addition to the reinforcing bars 7, PC steel bars 1 were installed at the third and fourth positions.
As shown in the figure, it is placed inside the formwork corresponding to the top slab part 2 and bottom slab part 3 of the box culvert, and then concrete is poured into the formwork and the concrete is poured into the formwork.
When it hardens to a compressive strength of about 300Kg/cm2 or more
Concrete box culverts, which strengthen prestressed steel bars by applying tensile stress, are widely known. The PC steel rod arrangement method shown in Figure 3 is straight
In this method, the PC steel rod 1 is arranged slightly inside the cross-sectional center line 5 of the box culvert 4. The method of arranging the PC steel rods shown in FIG. 4 is an example in which the inwardly curved PC steel rod 1 is arranged in such a manner that its left and right fixing portions 6 are located on the cross-sectional center line 5.
この従来のPC鋼棒の配設方法では、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ツク８が生じるという問題
点があつた。
In this conventional PC steel bar arrangement method, as shown by the solid line in Figure 6 and the dotted line in Figure 5, a large internal bending moment due to the PC steel bar remains in the upper part of the side wall. There was a problem in that tensile and cracking cracks 8 were generated in the upper part of the inside of the part.
本発明の課題は、従来のこれらの問題点を解消
したボツ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、クラツクの発
生のない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
ツ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ツクスカルバート
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
中央のボツ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
徴とするボツクスカルバートの製造法にある。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 without the occurrence of cracks. Concrete box culvert 4 is placed in the corresponding formwork, 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 prestressed steel bars to reinforce the strength. In the manufacturing method, the PC steel bar 1 placed in the formwork 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 same as that of the PC steel bar. A method for producing a box culvert characterized in that the outer displacement amount e 1 of the right and left fixing portions 6 of the rod 1 is set in a range of 0.5 to 1.5 times. Figure 1 shows the actual arrangement of the PC steel rod of the present invention,
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つて、従来通りボツクスカ
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倍としたことによつて、第５図実線に示
す様にボツクスカルバートの側壁上部に作用する
曲げモーメント値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
にすることができ、よつて製造段階で発生するク
ラツク８をなくすことができた。即ち本発明では
外部荷重のもつとも大きく作用する頂版部２、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１によつて必要な中央の曲げモーメン
ト値M0を従来のPC鋼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、よつてコンクリ
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e2＝e1程度の変位において良好な
結果を得ることができた。
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 box culvert can be increased and the concrete thickness can be reduced to create a structure that can sufficiently withstand external loads. Ta. Moreover, by bending the PC steel bar 1, the outer displacement e 2 of the anchoring part 6 is equal to the inner displacement e 1 of the center.
By increasing the value by 0.5 to 1.5 times, the bending moment value M2 acting on the upper side wall of the box culvert, as shown by the solid line in Fig. 5, is reduced compared to the conventional bending moment shown in Fig. 4.
It was possible to reduce the bending moment value M1 to about 1/4 of that of the PC steel bar, thereby eliminating cracks 8 that occur during the manufacturing stage. That is, in the present invention, in order to offset the maximum bending moment at the center of the top plate part 2 and bottom plate part 3, which is greatly affected by external loads, the center bending moment value M 0 required by the PC steel bar 1 is set to the conventional PC. While obtaining the same steel bar, we were able to significantly reduce the bending moment due to the PC steel bar at the top of the side wall, thereby simultaneously achieving the objectives of reducing the concrete thickness and preventing the occurrence of cracks. be. In the present invention, good results could be obtained at a displacement of approximately e 2 =e 1 .
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 addition, in FIG. 6, the bending moment in the case of 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.
以上の様に本発明によれば、PC鋼棒によつて
コンクリート厚みを減らしながら、PC鋼棒のた
め製造段階で従来発生していたクラツクをなくす
ことができたという優れた効果がある。
As described above, the present invention has the excellent effect of being able to eliminate the cracks that conventionally occur during the manufacturing stage due to the use of the prestressed steel bar while reducing the thickness of concrete using the prestressed steel bar.
第１図は本発明のボ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図は従来のボツクスカルバ
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：頂版部、３：底版部、４：
ボツクスカルバート、５：断面中心線、６：定着
部、７：鉄筋、８：クラツク。
Figure 1 is a longitudinal sectional view showing the box culvert of the present invention, Figure 2 is an explanatory diagram showing the arrangement of the PC steel bars of the invention, and Figures 3 and 4 are the arrangement of the PC steel bars of the conventional box culvert. Fig. 5 is a comparison diagram of bending moment between the present invention and a conventional curved PC steel bar, and Fig. 6 is a diagram showing the effect of bending moment on a conventional straight PC steel bar. 1: PC steel bar, 2: Top plate, 3: Bottom plate, 4:
Box culvert, 5: Section center line, 6: Anchoring section, 7: Rebar, 8: Cracks.
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
ボツクスカルバート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の中央のボツクスカルバートの
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ツクスカルバート
の製造法。1 Place the PC steel bar 1 into the top section 2 of the box culvert.
and concrete that is placed in a formwork corresponding to the bottom slab 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 bars to strengthen the concrete. In the manufacturing method of the box culvert 4, the PC steel rod 1 placed in the formwork is curved inward,
Moreover, 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 within the range of 0.5 to 1.5 times the outward displacement e 1 of the left and right anchoring parts 6 of the PC steel bar 1. The manufacturing method of box culvert is characterized by:
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 JPH028431A (en) | 1990-01-11 |
| JPH0325569B2 true 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) |
Families Citing this family (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 |
| JP7082400B2 (en) * | 2018-04-03 | 2022-06-08 | 旭コンクリート工業株式会社 | How to make box culvert |
-
1989
- 1989-05-11 JP JP11978189A patent/JPH028431A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH028431A (en) | 1990-01-11 |
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