KR20040049165A - Planar surface heater and curing method of cold weather concreting using planar surface heater - Google Patents
Planar surface heater and curing method of cold weather concreting using planar surface heater Download PDFInfo
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- KR20040049165A KR20040049165A KR1020020077018A KR20020077018A KR20040049165A KR 20040049165 A KR20040049165 A KR 20040049165A KR 1020020077018 A KR1020020077018 A KR 1020020077018A KR 20020077018 A KR20020077018 A KR 20020077018A KR 20040049165 A KR20040049165 A KR 20040049165A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
- H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
- H05B3/347—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles woven fabrics
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
- H05B3/36—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heating conductor embedded in insulating material
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
Abstract
Description
본 발명은 직포내에 함침된 재료의 전기저항에 의해 발열하는 전기발열시트와 그것을 이용하여 동절기의 콘크리트 타설 및 양생시 초기동해로부터 콘크리트를 보호하고 소요강도를 확보함은 물론 저온기의 콘크리트 표면가열에 의한 강도발현 촉진효과로 인한 공기단축이 가능하도록 하는 콘크리트의 양생공법에 관한 것이다.The present invention protects the concrete from the initial freeze during the concrete placement and curing of the winter during the concrete heating and curing by heating the electric resistance of the material impregnated in the woven fabric and secures the required strength, as well as by the concrete surface heating of the low temperature The present invention relates to a curing method of concrete that enables shortening of air due to the effect of promoting the strength expression.
일반적으로 콘크리트 구조물의 시공에 있어서 콘크리트는 시멘트, 골재 및 물을 주요 구성재료로 하며, 시멘트의 수화작용에 의해 경화되면서 일정한 강도를 갖게 된다.In general, in the construction of concrete structures, concrete is made of cement, aggregate, and water as the main constituent materials, and has a certain strength as it is cured by the hydration of cement.
한편, 동절기에 콘크리트를 타설함에 있어서 적절한 보양조치를 하지 않아 콘크리트의 온도가 빙점 이하로 되기 이전에 콘크리트가 충분히 강도를 내지 못하는 경우에는 콘크리트 내부의 수분이 동결되고 부피팽창 및 수분의 이동에 따른 압력으로 인해 콘크리트에 균열이 발생되고 지속적인 강도 증진이 불가능해진다. 따라서, 일반적으로 외기온의 평균이 4℃ 이하로 되는 기간을 한중콘크리트 적용기간으로 설정하고 콘크리트가 소요 품질을 확보할 수 있도록 적절한 보양을 하도록 규정하고 있다.On the other hand, when concrete is not strengthened enough before the temperature of the concrete falls below freezing point due to the lack of proper remedial action in the concrete placing in winter, the moisture inside the concrete is frozen and the pressure due to the volume expansion and movement of moisture This causes cracks in the concrete and makes it impossible to continuously increase the strength. Therefore, in general, the period in which the average outside air temperature is 4 ° C. or less is set as the application period of the Korea-China concrete, and the provision is made to properly maintain the concrete so as to secure the required quality.
이와 같이, 동절기에 타설되는 콘크리트가 동해를 입지 않고 소요 압축강도를 발휘하도록 하기 위한 보양방법으로서 종래에는 주로 콘크리트를 타설하는 구조체의 주변을 가설비계와 방수천막 등을 이용하여 완전히 둘러싸고 내부 공간을 갈탄난로나 열풍기 등으로 가열하는 양생공법이 주로 적용되어 왔다.In this way, as a reinforcement method for the concrete to be poured in winter without exerting the East Sea, it is conventionally used to completely surround the surroundings of the structure in which concrete is poured by using a temporary system and a waterproof tent, and then lignite the internal space. A curing method for heating with an stove or a hot air fan has been mainly applied.
또는 최근에는 콘크리트를 타설하기 이전에 거푸집의 내부에 배근되는 철근에 전열선을 결속한 후에 콘크리트를 타설하고 전열선의 양 단자에 전원을 인가하여 양생기간 동안에 일정한 온도를 유지시켜 콘크리트 구조물을 양생하고 적정한 강도가 발휘되도록 하는 양생방법이 제시된 바 있다.Or recently, after placing the heating wires on the reinforcing bars in the formwork before placing the concrete, the concrete is placed and power is applied to both terminals of the heating wires to maintain a constant temperature during the curing period to cure the concrete structure and provide the appropriate strength. Has been suggested to cure.
그러나, 이와 같은 종래의 방법은 시공작업시 현장 여건에 따라 많은 제약이 발생하며, 작업의 불편함이 발생하게 된다.However, such a conventional method has a lot of restrictions depending on the site conditions during the construction work, the inconvenience of the work occurs.
구체적으로는 갈탄난로나 열풍기를 이용하여 구조체 주위의 공간온도를 일정하게 유지하는 종래의 방법은 외기온이 급격히 낮은 동절기에는 피복재인 방수천막 등의 열손실이 매우 클뿐만 아니라 넓은 공간을 가열하므로 공간기온을 일정하게 유지하기가 매우 어려우며, 방수천막 내부의 부위에 따른 온도차와 콘크리트 구조물의 내부와 외부의 온도차로 인해 콘크리트의 양생 속도가 일정하지가 않게 되므로 강도증진의 정도에 차이가 발생하는 문제점이 발생할 수가 있다. 또한, 공기에 노출된 바닥슬래브의 경우 갈탄의 연소시 발생되는 일산화탄소 등에 의한 중성화로 인한 초기 경화불량을 비롯하여 장기적인 내구성 측면에서도 불리하며, 열풍기의 건조한 바람의 영향으로 표면건조가 급속히 발생되어 초기 건조수축으로 인한 균열발생 가능성이 매우 높다. 더욱이 방수천막으로 둘러싸인 공간의 밀폐성을 확보하는데 있어서 매우 곤란하므로 외기온이 일정 수준 이하로 내려가면 단기간 내에 콘크리트의 강도를 일정 수준까지 발현시키기 위한 양생온도의 유지가 매우 어렵다.Specifically, the conventional method of maintaining a constant temperature of the space around the structure by using lignite stove or a hot air blower has a very large heat loss such as a waterproofing membrane, which is a coating material, in winter, when the outdoor air temperature is very low, and also heats a large space. It is very difficult to maintain the constant, and the curing rate of the concrete is not constant due to the temperature difference according to the part inside the waterproof tent and the temperature difference between the inside and the outside of the concrete structure, causing a difference in the degree of strength increase. There is a number. In addition, the floor slab exposed to the air is disadvantageous in terms of long-term durability, including initial curing failure due to neutralization by carbon monoxide, etc. generated during combustion of lignite, and surface drying occurs rapidly due to the influence of dry wind of the hot air. The probability of cracking due to Moreover, it is very difficult to secure the sealing property of the space surrounded by the waterproof tent, so that when the outside temperature falls below a certain level, it is very difficult to maintain the curing temperature to express the strength of the concrete to a certain level within a short period of time.
다음으로 철근에 결속하여 콘크리트에 매설한 후 전원을 인가하여 일정한 온도를 유지하는 전열선 방법은 전열선을 결속하기 위한 수작업이 매우 번거로우며, 또한 콘크리트를 타설하는 과정에서 콘크리트의 투입 압력이나 콘크리트 작업자의 부주의 등으로 인하여 전열선의 배치 분포가 변형되어 불균일하게 발열이 이루어지거나 피복이 벗겨져 누전에 따른 과부하로 인해 전기공급이 불가능하게 되는 등의 문제점을 내포하고 있다. 또한, 발열구간이 선형이므로 전열선 주변의 콘크리트를 매개로 하여 열전달에 의해 콘크리트에 급열되므로 부위에 따른 온도편차가 발생될 수 있다.Next, the heating wire method that binds to the reinforcing bar and embeds it in concrete and maintains a constant temperature by applying power is very cumbersome for manual work to bind the heating wire, and in addition, the input pressure of the concrete or carelessness of the concrete worker Due to the deformation of the distribution of the heating wire is deformed due to the non-uniform heat generation or peeling of the coating, there is a problem such that the electricity supply is impossible due to the overload caused by the short circuit. In addition, since the heating section is linear, heat may be suddenly heated to the concrete by heat transfer through the concrete around the heating wire, thereby causing a temperature deviation according to the site.
즉, 종래의 동절기 콘크리트 구조물의 양생공법은 콘크리트의 적절한 양생 및 강도증진을 위해 투입되는 열량에 비해 그 효과가 매우 미미하거나 추가적인 많은 수작업을 필요로 하므로 시공작업이 지극히 어려우며, 시공 상에 많은 제약이 발생하게 된다.In other words, the curing method of the conventional winter concrete structure is very difficult or requires a lot of additional manual work compared to the heat input for the proper curing and strength of the concrete concrete construction work is extremely difficult, and many restrictions on construction Will occur.
본 발명은 상기의 결점을 해소하기 위한 것으로서, 동절기 콘크리트 구조물의 시공 시에 타설된 콘크리트가 충분한 강도를 발휘하기 이전에 결빙되지 않도록 하는 것은 물론 조기에 콘크리트 강도를 발현시켜 급열양생기간을 단축시킴으로써 동절기 골조 공사기간의 단축이 용이한 전기발열시트를 제공함에 있다.The present invention is to solve the above-described drawbacks, winter construction by preventing concrete from being frosted before the construction of the concrete construction in winter, as well as expressing the strength of the concrete early to shorten the rapid curing period The present invention provides an electric heating sheet that can easily shorten the construction period.
본 발명의 다른 목적은 전기발열시트를 이용하여 타공정과의 간섭없이 콘크리트를 적정하게 양생하고 강도발현을 이루기 위한 전기면상발열체의 배치방법, 전기공급방법, 콘크리트 온도관리 및 추가보온방법 등의 동절기 타설 콘크리트의 양생공법을 제공함에 있다.Another object of the present invention is to use an electric heating sheet to properly cure concrete without interference with other processes and to arrange the strength of the electric plane heating element, electric supply method, concrete temperature management and additional thermal insulation method, etc. It is to provide curing method of pouring concrete.
도 1은 본 발명에 따른 콘크리트 가열양생용 전기발열시트의 구성도.1 is a block diagram of an electric heating sheet for heating concrete according to the present invention.
도 2는 도 1의 A-A'선의 단면도.2 is a cross-sectional view taken along the line AA ′ of FIG. 1.
도 3은 도 1의 전기발열시트를 이용한 동절기 타설 콘크리트 양생의 개념도.3 is a conceptual diagram of the winter cast concrete curing using the electric heating sheet of FIG.
도 4는 전기발열시트를 이용한 동절기 타설 콘크리트의 온도이력 측정결과 그래프.Figure 4 is a graph of the temperature history measurement results of winter-poured concrete using an electric heating sheet.
도 5는 전기발열시트에 의한 양생조건별 콘크리트의 양생효과 및 강도발현 실험결과 그래프.5 is a graph showing the curing effect and strength expression test results of concrete according to curing conditions by the electric heating sheet.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>
100 : 전기발열시트 110 : 천부재100: heat generating sheet 110: cloth member
121 : 면단사 122 : 금속사121: cotton yarn 122: metal yarn
130 : 도전성 수지재 140 : 커버시트130: conductive resin material 140: cover sheet
150 : 커넥터부 160 : 온도제어유니트150: connector 160: temperature control unit
161 : 온도감지센서161: temperature sensor
이러한 본 발명의 동절기 콘크리트 구조물 시공용 전기발열시트는 양측부에 전원이 인가되기 위한 도전성 금속사가 직조된 천부재와; 이 천부재에 도포된 도전성 수지재와; 도전성 수지재를 감싸 절연 및 방수를 위한 커버시트로써 달성된다.The electric heating sheet for the construction of the winter concrete structure of the present invention includes a cloth member woven with conductive metal yarn for power is applied to both sides; Conductive resin material coated on the cloth member; It is achieved as a cover sheet for insulating and waterproofing the conductive resin material.
또한, 본 발명의 전기발열시트에는 일정한 온도를 유지할 수 있도록 커넥터부에 온도제어용 유니트가 추가로 구성될 수가 있다.In addition, in the heat generating sheet of the present invention, a temperature control unit may be further configured in the connector portion to maintain a constant temperature.
본 발명의 실시예를 첨부 도면을 참고하여 상세히 설명하면 다음과 같다.An embodiment of the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 동절기 콘크리트 구조물 시공용 전기발열시트(100)는 도 1 내지 도 2에 도시된 바와 같이 일정한 면적을 갖는 천부재(110)와; 천부재(110)의 양 측부에 각각 직조되는 면단사(121)와 도전성 금속사(122)로 구성된 제1,2복합사와; 상기 제1 및 제2복합사와 함께 상기 천부재(110)에 도포된 도전성 수지재(130)와; 상기 도전성 수지재(130)를 감싸 절연 및 방수를 하기 위한 PVC재질의 커버시트(140)와; 상기 제1복합사 및 제2복합사의 각 금속사(122)와 전기적으로 연결되어 전원이 인가되는 커넥터부(150)로 구성되는 것을 기술상의 특징으로 한다.Electric heating sheet 100 for construction of winter concrete structures of the present invention includes a cloth member 110 having a predetermined area as shown in Figure 1 to 2; First and second composite yarns each comprising cotton single yarns 121 and conductive metal yarns 122 that are woven on both sides of the cloth member 110; A conductive resin material 130 coated on the cloth member 110 together with the first and second composite yarns; A cover sheet 140 made of PVC material for insulating and waterproofing the conductive resin material 130; Technical features of the present invention include a connector unit 150 electrically connected to the metal yarns 122 of the first composite yarn and the second composite yarn to which power is applied.
천부재(110)는 전기발열시트의 베이스를 이루며, 전기발열시트의 설치 공간에 적합하도록 적당한 크기를 갖는다.The cloth member 110 forms a base of the heat generating sheet, and has a suitable size to fit the installation space of the heat generating sheet.
도 1에 도시된 바와 같이, 천부재(110)의 양 측부에는 면단사(121)와 도전성의 금속사(122)로 이루어진 복합사가 각각 직조된다. 면단사(121)는 금속사(122)가 천부재(110)에 견고히 고정되도록 한다.As shown in FIG. 1, composite yarns made of cotton end yarn 121 and conductive metal yarn 122 are woven on both side portions of the cloth member 110, respectively. The surface end yarn 121 allows the metal yarn 122 to be firmly fixed to the cloth member 110.
면단사(121)와 도전성의 금속사(122)로 이루어진 복합사가 직조된천부재(110)는 전원이 인가됨에 따라 열을 발생시키는 도전성 수지재(130)가 도포된다. 상기 도전성 수지재는 은, 동, 니켈, 카본 등의 도전성 필러(filler)와 합성수지로 구성된 공지의 도전성 수지 재료이다.The cloth member 110 in which the composite yarn composed of the cotton single yarn 121 and the conductive metal yarn 122 is woven is coated with a conductive resin material 130 that generates heat as power is applied. The conductive resin material is a known conductive resin material composed of a conductive filler such as silver, copper, nickel and carbon and a synthetic resin.
도전성 수지재(130)가 도포된 천부재(110)에는 절연 및 방수를 위한 커버시트(140)가 구비되며, 바람직하게는 내열성이 우수하며, 방수성 등이 우수한 폴리염화비닐(PVC)이 이용될 수가 있다.The cloth member 110 to which the conductive resin material 130 is applied is provided with a cover sheet 140 for insulation and waterproofing. Preferably, polyvinyl chloride (PVC) having excellent heat resistance and excellent waterproofness can be used. There is a number.
바람직하게는 커버시트(140)가 구비된 전기발열시트(100)의 한쪽 면에는 단열부재 시트가 추가로 구성될 수가 있다. 즉, 타설된 콘크리트를 덮게 되는 전기발열시트(100)의 상측 면에 단열부재 시트를 구비함으로써, 발열 작용 동안에 콘크리트와 접하지 않는 전기발열시트(100)의 상측 면으로의 열손실을 방지할 수가 있다.Preferably, one side of the electric heating sheet 100 provided with a cover sheet 140 may be further configured a heat insulating member sheet. That is, by providing a heat insulating member sheet on the upper surface of the electrical heating sheet 100 to cover the poured concrete, it is possible to prevent heat loss to the upper surface of the electrical heating sheet 100 not in contact with the concrete during the heating action. have.
천부재(110)와 함께 도전성 수지재(130)가 도포된 복합사의 각 금속사(122)는 전원을 인가할 수 있도록 커넥터부(150)가 구비된다.Each of the metal yarns 122 of the composite yarn in which the conductive resin material 130 is coated together with the cloth member 110 is provided with a connector 150 to apply power.
이와 같이 구성된 본 발명의 전기발열시트에는 미경화 콘크리트의 온도를 일정하게 유지할 수 있으며, 임의의 온도를 설정해 줄 수 있도록 온도제어유니트(160)가 추가로 구성될 수가 있다.In the electric heating sheet of the present invention configured as described above, the temperature of the unhardened concrete can be kept constant, and the temperature control unit 160 may be further configured to set an arbitrary temperature.
구체적으로는 전기발열시트(100)의 일측 면에는 온도를 감지하기 위하여 최소한 하나 이상의 온도감지센서(161)가 구비될 수가 있다. 온도감지센서(161)는 전기발열시트(100)의 면적의 크기, 또는 온도제어의 정도에 따라 전기발열시트(100)에 일정한 간격을 유지하며 다수개가 설치될 수가 있다.Specifically, at least one temperature sensing sensor 161 may be provided on one side of the heat generating sheet 100 to sense temperature. The temperature sensor 161 may be installed in a plurality of spaces to maintain a constant interval in the heat generating sheet 100 according to the size of the area of the heat generating sheet 100, or the degree of temperature control.
상기 온도감지센서(161)는 커넥터부(150) 측에 구비된 온도제어유니트(160)와 전기적으로 연결된다.The temperature sensor 161 is electrically connected to the temperature control unit 160 provided on the connector 150 side.
온도제어유니트(160)는 작업자가 원하는 온도를 설정하기 위한 키패드와, 설정 온도를 표시하기 위한 제1표시장치와, 상기 온도감지센서(161)에서 감지된 온도를 표시하기 위한 제2표시장치와, 전기발열시트(100)에 인가되는 전원을 단속하는 스위칭부와; 설정온도와 온도감지센서에서 감지된 온도를 비교하여 상기 스위칭부를 제어하기 위한 제어부로 구성될 수가 있다.The temperature control unit 160 includes a keypad for setting a temperature desired by a worker, a first display device for displaying a set temperature, a second display device for displaying a temperature detected by the temperature sensor 161, and Switching unit for intermittent power applied to the heat generating sheet 100; The control unit may be configured to control the switching unit by comparing the set temperature and the temperature sensed by the temperature sensor.
온도제어유니트(160)의 제어부에는 일정한 시간 동안만 전원을 인가하여 전기발열시트가 발열하도록 작동 시간을 설정할 수 있는 타이머가 추가로 구성될 수가 있다.The control unit of the temperature control unit 160 may be further configured to apply a power only for a certain time to set a timer to set the operating time for the heat generating sheet.
한편, 본 발명의 전기발열시트는 탄소섬유시트와; 상기 탄소섬유시트의 양단부에 박음질된 도전선과; 상기 탄소섬유시트에 함침된 도전성 수지재와; 상기 도전성 수지재를 감싸 절연 및 방수를 하기 위한 PVC재질의 커버시트와; 상기 도전선과 전기적으로 연결되어 전원이 인가되는 커넥터부로 구성될 수 있다.On the other hand, the heat generating sheet of the present invention carbon fiber sheet; Conductive wires sewn on both ends of the carbon fiber sheet; A conductive resin material impregnated in the carbon fiber sheet; A cover sheet made of PVC material for insulating and waterproofing the conductive resin material; It may be composed of a connector portion electrically connected to the conductive line to which power is applied.
이때 커넥터부에는 도 1의 온도제어유니트(160)와 온도감지센서(161)가 전기적으로 연결되고, 선택적으로 타이머가 추가 구비될 수 있다.In this case, the temperature control unit 160 and the temperature sensor 161 of FIG. 1 may be electrically connected to the connector, and a timer may be additionally provided.
이와 같이 구성된 본 발명의 전기발열시트를 이용하여 동절기 콘크리트 구조물에의 시공 및 양생방법을 살펴보면 다음과 같다.Looking at the construction and curing method for the winter concrete structure using the electric heating sheet of the present invention configured as described above are as follows.
콘크리트를 슬래브 거푸집 위에 일정한 두께로 타설한 후에 그 상측 면에 본 발명의 전기발열시트를 깔게 된다. 전기발열시트를 덮는 부위는 벽식구조 아파트의 경우에는 상부층의 시공을 위해 노출된 벽체철근에 의해 구획된 바닥면에 대하여전기발열시트의 양쪽 날개 부분이 다소 겹치도록 배열한다. 기둥-보로 구성된 라멘조 건물의 바닥슬래브에 적용하는 경우에는 콘크리트 타설구획의 단변방향으로 전기발열시트를 배치하며, 기둥이 배치된 구간은 슬래브 하부에 보가 배치되어 콘크리트 자체의 수화열만으로도 충분한 양생이 가능하므로 전기발열시트를 배치하지 않아도 좋다.After pouring concrete to a certain thickness on the slab formwork, the electric heating sheet of the present invention is laid on the upper side thereof. The area covering the heat generating sheet is arranged so that both wing portions of the heat generating sheet overlap slightly with respect to the floor surface partitioned by the exposed wall reinforcement for the construction of a wall structure apartment. When applied to the floor slab of a column-beamed ramen-like building, an electric heating sheet is arranged in the short side of the concrete pouring section, and beams are arranged in the lower part of the slab so that sufficient curing can be achieved by the heat of hydration of the concrete itself. It is not necessary to arrange the heat generating sheet.
작업자는 전기발열시트(100)의 커넥터부(140)를 전원과 연결하며, 온도제어유니트(160)의 키패드를 조작하여 적정한 온도로 설정하게 되면, 전기발열시트(100)의 도전성 수지재에 열이 발생하여 미경화 콘크리트가 양생과정 동안에 일정한 온도를 유지하게 된다.The operator connects the connector 140 of the heat generating sheet 100 to a power source, and when the operator sets the proper temperature by operating the keypad of the temperature control unit 160, the heat is heated to the conductive resin material of the heat generating sheet 100. This will cause the unhardened concrete to maintain a constant temperature during the curing process.
이때, 전기발열시트(100)에 구비된 온도감지센서(161)는 지속적으로 미경화 콘크리트의 온도를 감지하여 온도제어유니트(160)로 출력하게 되며, 온도제어유니트(160)의 제어부는 설정온도와 감지된 온도를 비교하여 스위칭부를 제어함으로써, 전기발열시트(100)에 인가되는 전원의 흐름을 단속하여 설정된 온도를 일정하게 유지하게 된다.At this time, the temperature sensor 161 provided in the heat generating sheet 100 continuously detects the temperature of the unhardened concrete and outputs it to the temperature control unit 160, the control unit of the temperature control unit 160 is set temperature By controlling the switching unit by comparing with the sensed temperature, by intermittent the flow of power applied to the heat generating sheet 100 to maintain a set temperature constant.
양생과정 동안에 전기발열시트의 상측에는 열손실을 방지하기 위하여 스치로폼이나 부직포 등과 같은 단열부재를 덮어줄 수가 있다. 전기발열시트 상측의 열손실 방지를 위한 단열부재의 배치에 있어서는 전기발열시트간 겹침부에서 단열부재끼리 겹치지 않도록 배치하여야 하며, 슬래브 상부로 노출된 철근 위로 단열부재를 덮어 준다. 단, 노출된 철근 위로 단열부재를 덮을 때 전기발열시트를 덮고 있는 단열부재가 전기발열시트와 이격되지 않도록 주의해야 하며, 단열부재가 일체화된전기발열시트를 적용하는 경우에는 외기온도 수준에 따라 추가적으로 부직포를 덮을 수 있다.During the curing process, the upper side of the heat generating sheet may cover an insulating member such as styrofoam or nonwoven fabric to prevent heat loss. In the arrangement of the heat insulating member for preventing heat loss on the upper side of the heat generating sheet, the heat insulating members should be arranged so as not to overlap each other in the overlap between the heat generating sheets. However, when covering the heat insulating member over the exposed reinforcing bar, care must be taken to ensure that the heat insulating member covering the heat generating sheet is not spaced apart from the heat generating sheet. The nonwoven can be covered.
도 5는 전기발열시트의 유,무 그리고 하부단열재 채택 여부에 따른 동절기 타설 콘크리트의 온도이력 측정결과 그래프로서, 전기발열시트와 하부단열재를 사용하였을 경우 대략 40시간의 단 시간내에 콘크리트의 온도 및 이에 따른 성숙도가 배이상 높아짐을 알 수 있다.FIG. 5 is a graph showing the results of measuring the temperature history of winter-poured concrete according to the presence or absence of an electric heating sheet and whether the lower heat insulating material is adopted. When the electric heating sheet and the lower heat insulating material are used, the temperature of the concrete within a short time of about 40 hours and thus It can be seen that the degree of maturity increases more than twice.
도 6은 전기발열시트에 의한 양생조건별 콘크리트의 양생효과 및 강도발현 실험결과 그래프로서, 발열시트를 사용하지 않았을 경우 24시간 평균압축강도는 0.0㎏f/㎠, 96시간 평균압축강도는 37.1㎏f/㎠이었다.6 is a graph showing the results of curing and strength expression of concrete according to curing conditions by an electric heating sheet. When the heating sheet is not used, the average compressive strength of 24 hours is 0.0㎏f / ㎠ and the average compressive strength of 96 hours is 37.1㎏. f / cm 2.
그러나, 전기발열시트를 사용하여 2일간 급열 양생하였을 경우 24시간 평균압축강도 80.6㎏f/㎠, 96시간 평균압축강도 158.5㎏f/㎠이었고, 2일간 야간만 급열 양생하였을 경우에도 24시간 평균압축강도 43.8㎏f/㎠, 96시간 평균압축강도 128.0㎏f/㎠으로 높게 나타났다.However, in the case of rapid heat curing for 2 days using the heat-generating sheet, the average compressive strength was 80.6kgf / ㎠ for 24 hours, the average compressive strength was 158.5㎏f / ㎠ for 96 hours, and 24 hours average compression for 2 hours at night. The strength was high as 43.8 kgf / cm 2 and 96 hour average compressive strength 128.0 kgf / cm 2.
이상과 같은 동절기 콘크리트 구조물 시공용 전기발열시트는 양 측부에 전원이 인가되기 위한 도전성 금속사가 직조된 천부재와; 이 천부재에 도포된 도전성 수지재와; 도전성 수지재를 감싸 절연 및 방수를 위한 커버시트로 구성되어, 말거나 접을 수가 있으며, 또한 전기발열시트의 특정 일부 부분이 손상되더라도 충분히 발열이 일어나게 되므로, 취급 및 시공이 용이하며, 미경화 콘크리트 전체를 균일한 온도로 유지할 수 있으므로 동절기의 콘크리트 구조물 시공 시에 발생할 수 있는 구조적인 강도의 저하를 방지하고 공사기간을 단축할 수 있는 효과가 있는 발명인 것이다.Electric heating sheet for construction of the winter concrete structure as described above and the cloth member woven with conductive metal yarn for power is applied to both sides; Conductive resin material coated on the cloth member; It is composed of a cover sheet for insulating and waterproofing the conductive resin material, which can be rolled up or folded, and also generates sufficient heat even if a certain part of the heat generating sheet is damaged, so it is easy to handle and install, and the entire unhardened concrete Since it can be maintained at a uniform temperature it is an invention that has the effect of preventing the degradation of the structural strength that may occur during construction of concrete structures in winter and shorten the construction period.
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