JP3597460B2 - Steam curing tank for concrete products - Google Patents

Steam curing tank for concrete products Download PDF

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Publication number
JP3597460B2
JP3597460B2 JP2000339651A JP2000339651A JP3597460B2 JP 3597460 B2 JP3597460 B2 JP 3597460B2 JP 2000339651 A JP2000339651 A JP 2000339651A JP 2000339651 A JP2000339651 A JP 2000339651A JP 3597460 B2 JP3597460 B2 JP 3597460B2
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Prior art keywords
curing
curing tank
temperature
tank
steam
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JP2002137220A (en
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哲 柴田
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哲 柴田
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02Selection of the hardening environment
    • C04B40/024Steam hardening, e.g. in an autoclave
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は未硬化のコンクリート製品を、蒸気を利用して養生しながら硬化を促す場合に使用する断熱構造の養生槽に関する。
【0002】
【従来の技術】
未硬化のコンクリート製品を安定に乾燥硬化させるために、従来から高温で満たした断熱構造の養生槽内に多数の未硬化コンクリート製品を収容し、乾燥硬化(蒸気養生)を促す方法が広く行われている。
【0003】
又蒸気効率(養生効率)を向上するために、断熱構造の養生槽を複数棟並設して連槽構造にし、ボイラーから各養生槽内へ蒸気を並列供給し、一定の蒸気養生時間を経た後ボイラーを停止し、コンクリート製品を各養生槽内から取り出している。
【0004】
【発明が解決しようとする課題】
然るに従来より各養生槽内からコンクリート製品を取り出した時に、急激に低下する外気温によりコンクリート製品にクラックを発生する問題を有している。
【0005】
従来はこの問題を解決すべく、上記ボイラーを停止した後、養生槽内にコンクリート製品を一定時間保有させる養生工程を経させた後、コンクリート製品を各養生槽内から取り出す方法を採っているが、養生槽が断熱構造であるために、ボイラーを停止しても充分な温度降下が得られず、外気温によっては上記クラックの発生を回避し難く、充分な温度降下を得るためにボイラー停止後の養生期間を長く設定すると、養生効率を悪化し、実施し難い問題を派生する。
【0006】
【課題を解決するための手段】
本発明は上記問題を抜本的に解決するコンクリート製品の蒸気養生槽を提供するものであり、その手段として、上記各養生槽に各養生槽内の室温を検出する温度センサーを設けると共に、各養生槽に該温度センサーの温度検出信号により開閉される排気弁を設け、該排気弁の開動作時に各養生槽の内気を排気する排風機を備え、この排気により各養生槽内の室温を個別にコントロールし得る構造にした。
【0007】
即ち各養生槽内の室温が所定の高温に達し一定の蒸気養生時間を経た後、温度センサーによる温度検出信号により各養生槽の排気弁を開き、排風機により排気することにより速やかに室温降下を促して、上記各養生槽における室温を可及的に外気に近づけた後、各養生槽内からコンクリート製品を取り出すことができ、従来の外気温の急激な変化によるクラック発生の問題を適切に解決し得る。
【0008】
殊に連槽構造の養生槽における各養生槽毎の室温コントロール、殊にコンクリート製品取り出し時における各養生槽内の室温降下のコントロールが適正に実現できる。
【0009】
又各養生槽に各養生槽内の室温を検出する上記温度センサーとは別の温度センサーを設け、該温度センサーの温度検出信号により上記ボイラーの停止と起動を制御する構成を併用することにより、上記排気による急激な温度低下をコントロールし、ボイラー停止後の養生を安定にする。
【0010】
【発明の実施の形態】
以下本発明の実施の形態を図1乃至図3に基づいて説明する。
【0011】
図1に示すように、断熱壁パネル1を左右に対向して奥行方向に並設すると共に、アーチ形の断熱天井パネル2の両端を上記左右断熱壁パネル1の夫々の上端に横架して同パネル2を奥行方向に並設して、断熱構造の単位養生槽A1,A2…を形成し、隣接する単位養生槽A1,A2…は各養生槽A1,A2…間に存する上記断熱壁パネル1を共有せしめて単位養生槽A1,A2…を間口方向に並設した連槽構造のコンクリート製品養生槽を形成する。
【0012】
上記コンクリート製品とは、ボックスカルバートやU字溝や擁壁ブロック等である。
【0013】
上記各養生槽A1,A2…に各養生槽内の室温を検出する温度センサー3を夫々設けると共に、各養生槽A1,A2…に該温度センサー3の温度検出信号により開閉される排気弁4を夫々設け、開動作している排気弁4を通じて該開動作している排気弁4を有する養生槽A1,A2…の内気を排気する排風機5を備え、この排風機5による排気により各養生槽A1,A2…内の室温を個別にコントロールし得る構造にする。
【0014】
これにより各養生槽A1,A2…における高温蒸気による養生時間を経た後、温度センサー3による温度検出信号により各養生槽の排気弁4の開閉を個別にコントロールし、開動作している排気弁4を通じてその養生槽の内気を排風機5により排気して速やかに室温降下を促し、該排気により上記各養生槽A1,A2…における室温を可及的に外気に近づけた後、各養生槽A1,A2…内からコンクリート製品を取り出すことができ、コンクリート製品の取り出し時における外気温の急激な変化によるクラック発生の問題を適切に解決する。
【0015】
又各養生槽A1,A2…に各養生槽内の室温を検出する上記温度センサー3とは別の温度センサー6を設け、該温度センサー6の温度検出信号によりボイラー7の停止と起動を制御する構成を併用することにより、上記排気による急激な温度低下をコントロールし、ボイラー停止後の養生を安定にする。
【0016】
次に図2,図3に基づき、上記コンクリート製品の蒸気養生槽を用いた養生方法と構成について説明する。
【0017】
上記各温度センサー3は制御装置8の入力側に並列接続し、制御装置8の出力側に上記排気弁4を並列接続して、更に制御装置8に排風機5を接続する。該排気弁4は電磁弁から成る。
【0018】
同様に上記温度センサー6は制御装置8の入力側に並列接続し、制御装置8の出力側にボイラー7を接続する。
【0019】
上記電磁弁から成る排気弁4は前記断熱天井パネル2の頂部、好ましくは同頂部の中心部に配置し、他方ボイラー7からの蒸気を養生槽A1,A2…の床付近から吐出させ、よって室内の蒸気を上記排気弁4を通じて均一に行えるようにする。
【0020】
上記制御装置8は図3の制御に用いる前置温度設定手段、前置時間設定手段、温度上昇時間設定手段、上限温度設定手段、上限温度保持時間の設定手段等を備える操作制御盤を兼ねる。
【0021】
而して図3に示すように、ボイラー7から各養生槽A1,A2…内に蒸気を供給して室温を一定温度で一定時間保ち推移し蒸気養生を経させる「前置温度工程」を設置し、該前置温度工程を経た後室温を上昇する「上昇温度工程」を経て、該上昇温度が上限の高温に達した後該上限温度を一定に保ち推移する「上限温度工程」を一定時間経させ、ボイラー7を停止し蒸気供給を停止する。
【0022】
上記ボイラー7の停止と連動して上記排風機5を作動せしめ、排気可能な状態を予め形成して置く。そして上記温度センサー3による各養生槽A1,A2…内の室温を検出し、上記上限温度工程を経た後、該上限温度において上記排気弁4を開状態にする。この動作が養生槽A1,A2…毎に行われ、上記開動作している排気弁4を通じて該開動作している排気弁4を有する養生槽A1,A2…の内気を排風機5により排気し、「下降温度工程」を経させる。この排風機5による排気により各養生槽A1,A2…内の室温を個別にコントロールする。
【0023】
殊に上記排気によりボイラー7停止後の養生工程における室温を速やかに且つ適切に降下させ、各養生槽A1,A2…内の室温を可及的に外気に近づけ、各養生槽A1,A2…内からのコンクリート製品の取り出しを行う。
【0024】
又上記温度センサー6により、上記排気中における各養生槽A1,A2…内の室温を検出し、該排気による室温が急激に低下した時に、ボイラー7を再起動して急激な温度低下を緩和し、適切な温度降下カーブを以って各養生槽A1,A2…内の室温を制御することができる。
【0025】
【発明の効果】
本発明によれば、上記各養生槽における室温を可及的に外気に近づけた後、各養生槽内からコンクリート製品を取り出すことができ、従来の外気温の急激な変化によるクラック発生の問題を適切に解決し得る。
【0026】
又ボイラー停止後の養生工程内において、ボイラーを起動せしめて上記排気による急激な温度低下を緩和し、ボイラー停止後の養生を安定にすることができる。
【図面の簡単な説明】
【図1】コンクリート製品の蒸気養生槽とその温度コントロール装置を概示する正面図。
【図2】コンクリート製品の蒸気養生槽の室温をコントロールする回路を示すブロック図。
【図3】上記コンクリート製品の蒸気養生槽における養生工程例を温度と時間の関係を以って示すグラフ。
【符号の説明】
A1,A2… 単位養生槽
1 断熱壁パネル
2 断熱天井パネル
3 温度センサー
4 排気弁
5 排風機
6 温度センサー
7 ボイラー
8 制御装置
[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating curing tank used to promote curing of uncured concrete products while using steam to cure the concrete products.
[0002]
[Prior art]
In order to stably dry and harden uncured concrete products, there has been widely used a method of accommodating a large number of uncured concrete products in a curing tank having a heat insulating structure filled with high temperature and promoting drying and hardening (steam curing). ing.
[0003]
In order to improve the steam efficiency (curing efficiency), a plurality of heat-insulating curing tanks are arranged side by side to form a continuous tank structure, and steam is supplied in parallel from the boiler into each curing tank, and after a certain steam curing time After that, the boiler was stopped and concrete products were removed from each curing tank.
[0004]
[Problems to be solved by the invention]
However, conventionally, when the concrete product is taken out from each curing tank, there is a problem that the concrete product is cracked by the rapidly decreasing outside temperature.
[0005]
Conventionally, in order to solve this problem, a method has been adopted in which after stopping the boiler, a curing process for holding the concrete product in the curing tank for a certain period of time, and then taking out the concrete product from each curing tank. Since the curing tank has a heat insulating structure, a sufficient temperature drop cannot be obtained even when the boiler is stopped, and it is difficult to avoid the above-mentioned cracks depending on the outside air temperature. If the curing period is set to be long, the curing efficiency will be degraded, which will lead to problems that are difficult to implement.
[0006]
[Means for Solving the Problems]
The present invention provides a steam curing tank for a concrete product that drastically solves the above-mentioned problem. As a means for providing a curing sensor, each curing tank is provided with a temperature sensor for detecting a room temperature in each curing tank. An exhaust valve that is opened and closed by the temperature detection signal of the temperature sensor is provided in the tank, and a ventilator that exhausts the inside air of each curing tank when the exhaust valve is opened is provided, and the exhaust individually reduces the room temperature in each curing tank. It has a controllable structure.
[0007]
That is, after the room temperature in each curing tank reaches a predetermined high temperature and a certain steam curing time has passed, the exhaust valve of each curing tank is opened by a temperature detection signal from a temperature sensor, and the room temperature is quickly lowered by exhausting with an air blower. After prompting the room temperature in each curing tank to be as close as possible to the outside air, concrete products can be taken out from each curing tank, and the conventional problem of crack generation due to rapid changes in outside temperature can be properly solved. I can do it.
[0008]
In particular, it is possible to appropriately realize the control of the room temperature of each curing tank in the curing tank having a continuous tank structure, and particularly the control of the drop of the room temperature in each curing tank when the concrete product is taken out.
[0009]
In addition, by providing a separate temperature sensor from the above-mentioned temperature sensor for detecting the room temperature in each curing tank in each curing tank, and using a configuration for controlling the stop and start of the boiler by a temperature detection signal of the temperature sensor, The rapid temperature drop caused by the exhaust gas is controlled, and the curing after the boiler is stopped is stabilized.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0011]
As shown in FIG. 1, the heat insulating wall panels 1 are arranged side by side in the depth direction so as to face left and right, and both ends of an arch-shaped heat insulating ceiling panel 2 are laid on the upper ends of the left and right heat insulating wall panels 1 respectively. Panels 2 are arranged side by side in the depth direction to form unit curing tanks A1, A2,... Having a heat insulating structure, and adjacent unit curing tanks A1, A2,. 1 are shared to form a concrete product curing tank having a continuous tank structure in which unit curing tanks A1, A2,.
[0012]
The concrete products are box culverts, U-shaped grooves, retaining wall blocks, and the like.
[0013]
Each of the curing tanks A1, A2,... Is provided with a temperature sensor 3 for detecting the room temperature in each curing tank, and each of the curing tanks A1, A2,. Are provided to exhaust the inside air of the curing tanks A1, A2,... Each having the exhaust valve 4 that is being opened through the exhaust valve 4 that is being opened. The structure is such that the room temperature in A1, A2... Can be individually controlled.
[0014]
After the curing time due to the high-temperature steam in each curing tank A1, A2,..., The opening and closing of the exhaust valves 4 of each curing tank is individually controlled by the temperature detection signal from the temperature sensor 3 to open the exhaust valve 4. The air inside the curing tank is exhausted by the air blower 5 to promptly lower the room temperature, and the room temperature in each of the curing tanks A1, A2,. A2: The concrete product can be taken out from the inside, and the problem of crack generation due to a sudden change in the outside temperature at the time of taking out the concrete product can be appropriately solved.
[0015]
Each of the curing tanks A1, A2,... Is provided with a temperature sensor 6 different from the temperature sensor 3 for detecting the room temperature in each curing tank, and the stop and start of the boiler 7 are controlled by the temperature detection signal of the temperature sensor 6. By using the configuration in combination, it is possible to control a rapid decrease in temperature due to the exhaust gas and to stabilize the curing after stopping the boiler.
[0016]
Next, a curing method and configuration of the concrete product using the steam curing tank will be described with reference to FIGS.
[0017]
The temperature sensors 3 are connected in parallel to the input side of the control device 8, the exhaust valve 4 is connected in parallel to the output side of the control device 8, and the exhaust device 5 is connected to the control device 8. The exhaust valve 4 comprises a solenoid valve.
[0018]
Similarly, the temperature sensor 6 is connected in parallel to the input side of the control device 8, and the boiler 7 is connected to the output side of the control device 8.
[0019]
The exhaust valve 4 composed of the above-mentioned solenoid valve is disposed at the top of the heat-insulated ceiling panel 2, preferably at the center of the top, and discharges steam from the boiler 7 from near the floor of the curing tanks A1, A2. Is made uniform through the exhaust valve 4.
[0020]
The control device 8 also serves as an operation control panel including a front temperature setting unit, a front time setting unit, a temperature rise time setting unit, an upper limit temperature setting unit, an upper limit temperature holding time setting unit, and the like used for the control of FIG.
[0021]
As shown in FIG. 3, a "pre-temperature step" is provided in which steam is supplied from the boiler 7 into each of the curing tanks A1, A2,... Then, after passing through the pre-temperature step, passing through the "rising temperature step" in which the room temperature is raised, and after the rising temperature reaches the upper limit of the high temperature, the "upper temperature step" in which the upper limit temperature is kept constant is changed for a predetermined time. Then, the boiler 7 is stopped to stop the steam supply.
[0022]
The exhaust fan 5 is operated in conjunction with the stop of the boiler 7, and an exhaustable state is formed in advance. The room temperature in each of the curing tanks A1, A2,... Is detected by the temperature sensor 3, and after the upper limit temperature step, the exhaust valve 4 is opened at the upper limit temperature. This operation is performed for each of the curing tanks A1, A2,..., And the inside air of the curing tanks A1, A2,. And a "falling temperature step". The room temperature in each curing tank A1, A2,... Is individually controlled by the exhaust air from the exhaust fan 5.
[0023]
In particular, the room temperature in the curing process after the boiler 7 is stopped is quickly and appropriately lowered by the above-described exhaustion so that the room temperature in each of the curing tanks A1, A2,. Of concrete products from the market.
[0024]
Further, the temperature sensor 6 detects the room temperature in each of the curing tanks A1, A2,... In the exhaust gas, and when the room temperature due to the exhaust gas suddenly decreases, the boiler 7 is restarted to mitigate the rapid temperature decrease. The room temperature in each curing tank A1, A2,... Can be controlled by an appropriate temperature drop curve.
[0025]
【The invention's effect】
According to the present invention, after bringing the room temperature in each of the curing tanks as close to the outside air as possible, concrete products can be taken out of each of the curing tanks, and the conventional problem of crack generation due to a rapid change in the outside temperature can be solved. Can be solved properly.
[0026]
Further, in the curing process after the boiler is stopped, the boiler can be started to mitigate the rapid temperature drop due to the exhaust gas, and the curing after the boiler is stopped can be stabilized.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a steam curing tank for concrete products and a temperature control device therefor.
FIG. 2 is a block diagram showing a circuit for controlling the room temperature of a steam curing tank for concrete products.
FIG. 3 is a graph showing an example of a curing process of the concrete product in a steam curing tank in relation to temperature and time.
[Explanation of symbols]
A1, A2 ... Unit curing tank 1 Insulated wall panel 2 Insulated ceiling panel 3 Temperature sensor 4 Exhaust valve 5 Air blower 6 Temperature sensor 7 Boiler 8 Control device

Claims (2)

複数の断熱構造の養生槽を備え、各養生槽内へ蒸気を供給するボイラーを備え、各養生槽内に未硬化のコンクリート製品を収容し、各養生槽内を上記ボイラーから供給される高温蒸気で満たして硬化を促すコンクリート製品の蒸気養生槽において、各養生槽に各養生槽内の室温を検出する温度センサーを設けると共に、各養生槽に該温度センサーの温度検出信号により開閉される排気弁を設け、該排気弁の開動作時に各養生槽の内気を排気する排風機を備えることを特徴とするコンクリート製品の蒸気養生槽。Equipped with a boiler for supplying steam to each curing tank, including a plurality of curing tanks having a heat insulating structure, accommodating uncured concrete products in each curing tank, and supplying high-temperature steam supplied from the boiler to each curing tank. In a concrete product steam curing tank that promotes hardening by filling with, a temperature sensor for detecting the room temperature in each curing tank is provided in each curing tank, and an exhaust valve that is opened and closed in each curing tank by a temperature detection signal of the temperature sensor. A steam curing tank for concrete products, comprising: an exhaust fan for exhausting the inside air of each curing tank when the exhaust valve is opened. 上記各養生槽に各養生槽内の室温を検出する上記温度センサーとは別の温度センサーを設け、該温度センサーの温度検出信号により上記ボイラーの停起動を制御する構成としたことを特徴とする請求項1記載のコンクリート製品の蒸気養生槽。A temperature sensor different from the temperature sensor for detecting the room temperature in each curing tank is provided in each curing tank, and the boiler is controlled to stop and start by a temperature detection signal of the temperature sensor. A steam curing tank for a concrete product according to claim 1.
JP2000339651A 2000-11-07 2000-11-07 Steam curing tank for concrete products Expired - Fee Related JP3597460B2 (en)

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