JP2002332746A - Grout antifreezing construction method - Google Patents
Grout antifreezing construction methodInfo
- Publication number
- JP2002332746A JP2002332746A JP2001139189A JP2001139189A JP2002332746A JP 2002332746 A JP2002332746 A JP 2002332746A JP 2001139189 A JP2001139189 A JP 2001139189A JP 2001139189 A JP2001139189 A JP 2001139189A JP 2002332746 A JP2002332746 A JP 2002332746A
- Authority
- JP
- Japan
- Prior art keywords
- grout
- sheath
- outer periphery
- heating wire
- temperature
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】プレストレストコンクリート
の緊張鋼材を配設するシース内部に充填するグラウトの
防凍方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for defrosting grout to be filled in a sheath in which a tension steel material of prestressed concrete is disposed.
【０００２】[0002]
【従来の技術】従来、プレストレストコンクリートのシ
ースに緊張鋼材を配設し、緊張力を導入して定着した
後、シース内にグラウトを充填していた。外気温が５℃
以下の場合にはセメントグラウトの施工が禁止されてお
り、氷点以下の厳冬期にはグラウトが凍結しないよう
に、シートでグラウト部分を覆い、外部に設置したジェ
ットヒータなどで熱風を吹き付けて加温するという方法
が採られていた。2. Description of the Related Art Conventionally, a tension steel material is provided on a sheath of prestressed concrete, and the sheath is filled with grout after fixing by applying a tension. Outside temperature is 5 ℃
In the following cases, the construction of cement grout is prohibited, and the grout is covered with a sheet so that the grout does not freeze during the severe winter season below the freezing point, and heated by blowing hot air with an external jet heater etc. The method of doing was adopted.
【０００３】近年、ニクロム線などの発熱線をグラウト
内に敷設し、通電加熱をおこなうことが提案されている
が、発熱線の表面が局部的に加熱され、２００〜４００
℃にまで上昇するために、セメント硬化のための結晶水
が飛散し、正常な硬化体が得られないことが多い。In recent years, it has been proposed to lay a heating wire such as a nichrome wire in a grout and to carry out electric heating. However, the surface of the heating wire is locally heated to 200 to 400 mm.
Since the temperature rises to ° C., water of crystallization for cement hardening is scattered, and a normal hardened body is often not obtained.
【０００４】[0004]
【発明が解決しようとする課題】ジェットヒータを使用
した従来方法は、セメントグラウトの養生に５〜７日程
度必要であり、また、温度の管理が面倒であり、結果的
に全体施工日数が長くなるという不都合があった。本発
明は、注入したセメントグラウトの養生時間を短縮する
とともにセメントグラウトの温度を適温に加熱制御でき
るようにすることである。The conventional method using a jet heater requires about 5 to 7 days for curing the cement grout, and is troublesome in temperature control, and as a result, the entire construction time is long. There was an inconvenience of becoming. It is an object of the present invention to shorten the curing time of the injected cement grout and to control the heating of the cement grout to an appropriate temperature.
【０００５】[0005]
【課題を解決するための手段】本発明は、プレストレス
トコンクリートの緊張鋼材を配設するシースの外周に電
気ヒータを設け、通電加熱してグラウトを適温に保持し
て養生すると共に、厳冬期においてはグラウトの凍結を
防止するものである。電気ヒータは、ニクロム線をガラ
ス繊維で絶縁被覆し、これをシースにスパイラル状に巻
き付けたものであり、温度センサーで温度管理を自動的
におこなった。更に、コンクリート体の外周を保温シー
トで被覆し、防凍効果を高めた。According to the present invention, an electric heater is provided on the outer periphery of a sheath in which a tension steel material of prestressed concrete is disposed, and the electric current is heated to keep the grout at an appropriate temperature to cure the grout. It prevents grout from freezing. The electric heater was made by insulating a nichrome wire with glass fiber and winding it around a sheath in a spiral manner. The temperature was automatically controlled by a temperature sensor. Furthermore, the outer periphery of the concrete body was covered with a heat insulating sheet to enhance the antifreezing effect.
【０００６】[0006]
【実施例】実施例１ 図１に示したコンクリートの成形体１２の大きさは１０
０×１００×１０００（ｃｍ）で、断面中央部分には、
外径７３ｍｍの金属製シース１の外周に直径１．０ｍｍ
のニクロム線（１．５７Ω／ｍ）をガラス繊維で被覆し
た電熱線１０を３０ｍｍのピッチでらせん状に巻き付け
たものが埋設してある。シース内部にはグラウトの温度
計測用の温度センサーが設置してある。EXAMPLE 1 The concrete compact 12 shown in FIG.
0 × 100 × 1000 (cm)
1.0 mm in diameter on the outer circumference of a metal sheath 1 having an outer diameter of 73 mm
Embedded is a spirally wound heating wire 10 coated with a glass fiber on a nichrome wire (1.57 Ω / m). A temperature sensor for measuring the temperature of the grout is installed inside the sheath.
【０００７】このシース１の内部に緊張用鋼材のＰＣ鋼
より線２を配設し、端部を定着し、水セメント比０．５
のセメントグラウト１３を充填した。平均外気温が−１
０℃の状態の場所にセメントグラウトを充填したコンク
リート成形体を設置し、電熱線に１００Ｖ電源を接続し
て通電した。２４時間通電加熱したところ、シース１内
部のグラウトの時間平均温度は１２℃であり、消費電力
は２５０Ｗであった。また、硬化したグラウトの２４時
間圧縮強度は２３．５Ｎ／ｍｍ2と良好な値を示した。[0007] Inside the sheath 1, a strand 2 of PC steel as a tension steel material is disposed, the ends thereof are fixed, and the water-cement ratio is 0.5.
Of cement grout 13 was filled. Average outside temperature is -1
A concrete molded body filled with cement grout was placed in a place at a temperature of 0 ° C., and a 100 V power supply was connected to a heating wire to conduct electricity. Upon heating for 24 hours, the time average temperature of the grout inside the sheath 1 was 12 ° C., and the power consumption was 250 W. Also, the 24-hour compressive strength of the cured grout showed a good value of 23.5 N / mm 2 .
【０００８】実施例２ 図２に示す例は、実施例１のコンクリート成形体１２
に、シース１の中央及び端部に温度センサー３を取り付
けたもので、この温度センサーからの信号を制御装置４
に送って通電を制御し、グラウトの３箇所の平均温度が
１５℃に維持されるようにしたものである。硬化したグ
ラウトの２４時間圧縮強度は、２８．５Ｎ／ｍｍ2であ
った。実施例１、２共にグラウトの必要強度である２
０．０Ｎ／ｍｍ2を超えており、十分な強度を有してい
ることが判明した。Embodiment 2 The example shown in FIG.
In addition, a temperature sensor 3 is attached to the center and the end of the sheath 1, and a signal from the temperature sensor is transmitted to a control device 4.
To control the energization, so that the average temperature of the grout at three points is maintained at 15 ° C. The 24-hour compressive strength of the cured grout was 28.5 N / mm 2 . In both Examples 1 and 2, the required strength of grout was 2
It exceeded 0.0 N / mm 2 , which proved to have sufficient strength.
【０００９】実施例３ 実施例１と同様なコンクリート成形体１２を使用し、同
一条件のシースを配設した。図３に示すように、コンク
リート成形体の外周を保温シート５で覆い、同様に１０
０Ｖ電源に接続して２４時間通電加熱した。シース内の
グラウトの平均温度は１８．５℃であり、保温シートの
温度は３５℃であった。グラウトの２４時間圧縮強度
は、３２．７Ｎ／ｍｍ2であった。Example 3 The same concrete molding 12 as in Example 1 was used, and a sheath under the same conditions was provided. As shown in FIG. 3, the outer periphery of the concrete molding was covered with a heat retaining sheet 5,
It was connected to a 0 V power supply and heated for 24 hours. The average temperature of the grout in the sheath was 18.5 ° C, and the temperature of the heat retaining sheet was 35 ° C. The 24-hour compressive strength of the grout was 32.7 N / mm 2 .
【００１０】外気温を予測し、電熱線の太さやらせんの
ピッチを適宜に選択して発熱量を変更し、シース内のグ
ラウト温度をある程度制御することができるので、制御
装置を設置することなくグラウトの温度制御をすること
が可能である。The temperature of the grout in the sheath can be controlled to some extent by estimating the outside air temperature and appropriately selecting the thickness of the heating wire and the pitch of the spiral to change the amount of heat generation. It is possible to control the temperature of the grout.
【００１１】[0011]
【発明の効果】本発明は、プレストレストコンクリート
の緊張鋼材のシースの外周に発熱線を設置し、シースを
加熱することによって、内部のグラウトが均一に加温さ
れるようにし、グラウトの凍結を防止すると共に硬化を
促進している。したがって、厳冬期においてもグラウト
の強度発現が短時間でおこなわれ、施工能率を上げるこ
とができる。セメントグラウトを電気抵抗熱で加熱して
短時間内に養生させることにより施工時間を大きく短縮
できるので、これに伴って人的及び物的資源を節減して
施工効率を向上させる効果がある。また、加熱作業は、
単に電源と発熱線を接続するだけでよく、ジェットヒー
タ等に比較して作業が簡易であると共に、制御装置によ
って予定温度に自動的に制御することが可能であり、人
手を減らすことが可能である。According to the present invention, a heating wire is provided on the outer periphery of a pre-stressed concrete tensioned steel sheath, and the sheath is heated so that the inside grout is uniformly heated and the grout is prevented from freezing. And promotes hardening. Therefore, even in severe winter season, the strength of grout is developed in a short time, and construction efficiency can be improved. The construction time can be greatly reduced by heating the cement grout with electric resistance heat and curing the cement grout in a short period of time. Accordingly, there is an effect of reducing human and physical resources and improving construction efficiency. In addition, heating work,
It is only necessary to connect the power supply and the heating wire, and the operation is simpler than that of a jet heater or the like, and it is possible to automatically control the temperature to a predetermined temperature by a control device. is there.
【図１】本発明の正面図。FIG. 1 is a front view of the present invention.
【図２】制御装置を付加した実施例。FIG. 2 is an embodiment in which a control device is added.
【図３】コンクリート成形体の外周を保温シートで覆っ
た状態の断面図。FIG. 3 is a sectional view showing a state in which the outer periphery of a concrete molded body is covered with a heat retaining sheet.
１ シース １０ 電熱線 １３ セメントグラウト ２ 緊張鋼材（ＰＣ鋼より線） ３ 温度センサー ４ 制御装置 ５ 保温シート DESCRIPTION OF SYMBOLS 1 Sheath 10 Heating wire 13 Cement grout 2 Tension steel material (PC steel strand) 3 Temperature sensor 4 Control device 5 Heat insulation sheet
Claims (5)
配設するシースの外周に電気ヒータを設け、通電して加
熱するグラウトの防凍施工法。1. An anti-freeze grouting method in which an electric heater is provided on the outer periphery of a sheath in which a tension steel material of prestressed concrete is disposed, and electricity is supplied to heat the grout.
維で絶縁被覆したニクロム線の発熱線をシースにスパイ
ラル状に巻き付けたものであるグラウトの防凍施工法。2. A method according to claim 1, wherein the electric heater is formed by spirally winding a heating wire of a nichrome wire insulated with glass fiber around a sheath.
状ヒータであり、シースに巻き付けたものであるグラウ
トの防凍施工法。3. The method according to claim 1, wherein the electric heater is a sheet-like heater, and the grout is wound around a sheath.
リート体の外周を保温シートで被覆するグラウトの防凍
施工法。4. A method according to claim 1, wherein the outer periphery of the concrete body is covered with a heat insulating sheet.
ラル状に巻き付けてあるプレストレストコンクリート用
シース。5. A sheath for prestressed concrete in which a heating wire is spirally wound at a pitch of 10 to 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001139189A JP2002332746A (en) | 2001-05-09 | 2001-05-09 | Grout antifreezing construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001139189A JP2002332746A (en) | 2001-05-09 | 2001-05-09 | Grout antifreezing construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002332746A true JP2002332746A (en) | 2002-11-22 |
Family
ID=18986000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001139189A Pending JP2002332746A (en) | 2001-05-09 | 2001-05-09 | Grout antifreezing construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002332746A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006159447A (en) * | 2004-12-02 | 2006-06-22 | Oriental Construction Co Ltd | Electric heating and ageing structure of prestressed concrete member |
| CN103171041A (en) * | 2013-04-09 | 2013-06-26 | 中建三局第二建设工程有限责任公司 | Auxiliary curing method for cold weather concrete by electric heating tapes |
| JP5493032B1 (en) * | 2013-05-01 | 2014-05-14 | 黒沢建設株式会社 | Grout cold curing method |
| CN105781119A (en) * | 2016-03-07 | 2016-07-20 | 彭宝安 | Embedded steel pipe pull-out device and method during post-tensioning method prestressed concrete construction |
| CN107059647A (en) * | 2017-06-22 | 2017-08-18 | 中铁二十局集团第五工程有限公司 | A kind of prestress pipe slip casting structure of controlling temperature and its temperature control method |
| KR101891982B1 (en) * | 2017-05-18 | 2018-08-27 | 한도경 | the structure of constructing PSC girder bridge and the method of constructing PSC girder bridge |
| CN114776053A (en) * | 2022-04-20 | 2022-07-22 | 中冶南方城市建设工程技术有限公司 | External concrete wall electric heating maintenance method |
-
2001
- 2001-05-09 JP JP2001139189A patent/JP2002332746A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006159447A (en) * | 2004-12-02 | 2006-06-22 | Oriental Construction Co Ltd | Electric heating and ageing structure of prestressed concrete member |
| JP4559203B2 (en) * | 2004-12-02 | 2010-10-06 | オリエンタル白石株式会社 | Electrothermal curing structure of prestressed concrete members. |
| CN103171041A (en) * | 2013-04-09 | 2013-06-26 | 中建三局第二建设工程有限责任公司 | Auxiliary curing method for cold weather concrete by electric heating tapes |
| JP5493032B1 (en) * | 2013-05-01 | 2014-05-14 | 黒沢建設株式会社 | Grout cold curing method |
| CN105781119A (en) * | 2016-03-07 | 2016-07-20 | 彭宝安 | Embedded steel pipe pull-out device and method during post-tensioning method prestressed concrete construction |
| KR101891982B1 (en) * | 2017-05-18 | 2018-08-27 | 한도경 | the structure of constructing PSC girder bridge and the method of constructing PSC girder bridge |
| CN107059647A (en) * | 2017-06-22 | 2017-08-18 | 中铁二十局集团第五工程有限公司 | A kind of prestress pipe slip casting structure of controlling temperature and its temperature control method |
| CN114776053A (en) * | 2022-04-20 | 2022-07-22 | 中冶南方城市建设工程技术有限公司 | External concrete wall electric heating maintenance method |
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