JP7227450B2 - Constant temperature curing device and vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a constant temperature curing apparatus and vehicle used in a method for estimating the strength of soil cement formed on supporting ground or the like.

It is known that when prefabricated piles are buried to construct a pile foundation, the strength of the hardened foot part and the circumference of the pile has a great effect on the bearing capacity of the pile foundation. In the construction of this pile foundation, a cement-based solidifying agent is injected into a pile hole formed by excavating the ground and mixed with the excavated soil by stirring to construct a foot protection part and a pile circumference part made of soil cement.

As a means of confirming the strength of such a hardening part, after the filling solidifies, a hole is drilled several tens of meters underground and a sample of soil cement or the like is collected by boring. Since this boring method is time-consuming and costly, a method of estimating the strength from a sample before solidification is used (see, for example, Patent Document 1). In this method, an unconsolidated sample is collected from inside a pile hole to prepare a test piece, which is then solidified in a constant temperature curing device on the ground under conditions such as constant temperature and humidity. After that, the strength of the specimen is confirmed by a compression test, and the strength of the underground foot protection part is estimated. In this strength estimation method, a method of judging the strength of a specimen after 28 days in a constant temperature curing apparatus, that is, the 28-day strength in standard curing is adopted.

On the other hand, this method requires at least 28 days from the injection of the cement-based solidifying agent to the test. By performing a compression test on the specimen after this special accelerated curing, the strength equivalent to the strength of 28 days old is achieved in a short period of time (for example, 1 to 7 days) If it is estimated that the strength is insufficient, a method of changing the mixing ratio or injection amount of the cement-based solidifying agent is adopted.

Various curing methods have been developed for temperature control when performing such standard curing or special accelerated curing (see, for example, Patent Document 2). A method of placing a specimen in a constant temperature bath is also known (see Patent Document 3, for example).

JP-A-2001-73360 JP-A-2000-346768 Japanese Utility Model Laid-Open No. 5-43070

The constant temperature curing apparatus described above has the following problems. Since it is a constant temperature curing device that can be carried at a construction site, the temperature control mechanism is simple. Therefore, it has been difficult to stably maintain a desired temperature with high precision. In addition, it was difficult to accurately evaluate the material age strength and the like of specimens with variations in the controlled temperature.

Accordingly, the present invention provides a constant temperature curing apparatus and vehicle capable of stabilizing and holding a specimen at a predetermined temperature with high accuracy.

The constant temperature curing apparatus according to claim 1 has two tanks that are liquid-tightly partitioned by a partition wall, each containing a heat insulating tank, a side wall surface of each tank of the heat insulating tank, a bottom plate, and a planar heating element provided on the partition wall, a holding portion for holding a test piece containing cement in the heat insulating tank, and a central portion of each tank of the heat insulating tank for controlling the temperature of the fluid. A temperature sensor for measurement and a controller for controlling the temperature of the heating element based on the output value of the temperature sensor are provided, and the temperature of the fluid is maintained at a predetermined temperature.
The constant temperature curing apparatus according to claim 2 has two tanks separated by a partition wall in a liquid-tight manner, each containing a heat insulating tank containing a fluid, a wall surface of each tank of the heat insulating tank, and the partition A planar heating element provided on the wall, a holding part for holding a specimen containing cement in the heat retaining tank, a temperature sensor arranged in each tank of the heat retaining tank for measuring the temperature of the fluid, and a control unit that controls the temperature of the heating element based on the output value of the temperature sensor, and maintains the temperature of the fluid at a predetermined temperature.
The constant temperature curing apparatus according to claim 3 has two tanks that are liquid-tightly partitioned by a partition wall, each containing a heat insulating tank for containing a fluid, and a A planar heating element, a planar Peltier element formed as the partition wall, a holding part for holding a specimen containing cement in the heat retaining tank, and the heat retaining tank arranged in each of the heat retaining tanks. A temperature sensor for measuring the temperature of the fluid, and a controller for controlling the temperature of the heating element and the Peltier element based on the output value of the temperature sensor, and maintaining the temperature of the fluid at a predetermined temperature. .

With the above configuration, the fluid in the heat-retaining tank is uniformly heated by the planar heating element, and the temperature of the entire fluid is kept constant by the control unit, so that the specimen containing cement such as soil cement, cement milk, etc. can be stabilized. It can be cured in an environment with a high temperature. Therefore, it is possible to provide a specimen capable of exhibiting accurate strength during a compression test. Therefore, it is possible to accurately evaluate the strength after a predetermined number of days have passed. Moreover, since a plurality of different curing environments can be formed by the partition walls, the specimen can be cured under a plurality of conditions at once.

According to a fourth aspect of the constant temperature curing apparatus, the holding portion is provided with vibration preventing means. As a result, the effect of external vibrations on curing can be minimized.

According to a fifth aspect of the constant-temperature curing apparatus, the heat-retaining bath has legs having vibration-preventing means. As a result, the effect of external vibrations on curing can be minimized.

A stirrer for stirring the fluid is provided in the heat retaining tank of the constant temperature curing apparatus according to claim 6 . As a result, the fluid in the heat-retaining tank is homogenized, so that the specimen containing cement such as soil cement or cement milk can be cured in a stable environment. Therefore, it is possible to accurately evaluate the strength after a predetermined number of days have passed.

A vehicle according to claim 7 has a constant temperature curing device. This allows curing to start close to where the soil cement or cement milk is extracted.

ADVANTAGE OF THE INVENTION According to this invention, the constant temperature curing apparatus and vehicle which can stabilize and hold|maintain a specimen at a predetermined temperature with high precision can be provided.

Explanatory drawing which shows the intensity|strength estimation using the warm water curing apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the warm water curing apparatus typically. Explanatory drawing which shows the procedure of the strength estimation method using the same warm water curing apparatus. Explanatory drawing which shows typically the modification of the same warm water curing apparatus. Explanatory drawing which shows typically the constant temperature curing apparatus which concerns on the 2nd Embodiment of this invention. FIG. 5 is an explanatory diagram schematically showing a hot water curing apparatus according to a third embodiment of the present invention; Explanatory drawing which shows the procedure of the strength estimation method using the same warm water curing apparatus.

Hereinafter, the present invention will be described based on illustrated embodiments. This embodiment is an example applied to a method for estimating the strength of soil cement in a hardened foot portion such as a prefabricated pile. FIG. 1 is an explanatory view showing strength estimation using the hot water curing apparatus 10 according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view schematically showing the hot water curing apparatus 10, and FIG. is an explanatory diagram showing the procedure of an intensity estimation method using . In the figure, S is a soil cement specimen, L is water, M is air, G is ground, Q is a borehole, and V is a vehicle. The specimen S is housed in a tubular body or bag having a diameter of about 5 cm and a height of about 15 cm, for example.

In FIG. 1, 1 is a boring device, 2 is an extension rod, 3 is a sampling device, 4 is a uniaxial compression tester, and 10 is a hot water curing device (constant temperature curing device).

The hot water curing device 10 includes a heat insulating bath 20 . The heat insulating tank 20 is placed on the ground G or the like by means of legs 21 made of rubber or the like. Further, the heat retaining tank 20 is provided with a side wall surface 22, a bottom plate 23, and a top plate 24 which are made of a heat insulating material or the like. A planar heater 25 is provided on the side wall surface 22 and the bottom plate 23 .

Inside the heat insulating tank 20, there are provided a support portion 27 made of an elastic material provided on the bottom plate 23, and a table (holding portion) 28 on which the specimen S is placed. The table 28 is formed in a size on which 24 specimens S can be placed, for example.

The heater 25 provided on the side wall surface 22 is arranged such that the lower end of the heater 25 is positioned at approximately the same height as the upper surface of the bottom plate 23 . Further, the upper end of the heater 25 is arranged at a position higher than the upper end surface of the specimen S. As shown in FIG. When specimens S with different heights are used, they are arranged so as to be higher than the upper end face of the specimen S with the highest height.

The heater 25 provided on the bottom plate 23 is arranged so that the edge of the heater 25 on the side of the side wall 22 is positioned closer to the side wall 22 than the outer peripheral edge of the table 28 .

The heater 25 is not provided on the top plate 24 . Since the heated water L moves upward due to heat convection, there is no need to heat the vicinity of the top plate 24 .

That is, the heater 25 is arranged so as to cover the table 28 on which the specimen S is placed except for the upper side.

The heater 25 can develop a uniform temperature in the plane in contact with the water L.

Each heater 25 is connected to a controller 30, which will be described later. The top plate 24 is configured to be openable and closable, and can be liquid-tightly closed when closed. A temperature sensor 26 is provided inside the heat insulating bath 20 .

When the water L on the side of the heater 25 provided on the side wall surface 22 is heated, it becomes lighter in density and moves upward. The specimen S on the table 28 is warmed when moving upward.

When the water L above the heater 25 provided on the bottom plate 23 is also heated, it moves upward and heats the specimen S on the table 28 .

The water L heated by the heater 25 provided on the bottom plate 23 and moved upward joins the water L warmed from the side wall surface 22 and moves to the upper center where there is no heat source. Since the heated water L gathers in the upper center of the water, a downward flow is generated in the center of the water to cause circulation of the water L, that is, convection.

The temperature sensor 26 is arranged at a position where this downward flow occurs. Specifically, it is provided in the center of the table 28 .

A controller 30 for controlling each heater 25 and a battery 31 are provided outside the bottom plate 23 . The control unit 30 turns ON/OFF the power supply to the heater 25 based on the temperature output value from the temperature sensor 26 described above. Note that the temperature control may be performed based on the temperature change rate instead of the temperature output value.

Further, when the predetermined temperature is reached, the power supply to the heater 25 on the side wall surface 22 may be stopped and only the heater 25 on the bottom plate 23 side may be operated. Only the heater 25 on the wall surface 22 side may be operated.

The control unit 30 is connected to an external power source such as a commercial power supply, and supplies power to the heater 25 and controls the heater 25 . Further, the control unit 30 has a timer and a storage unit inside, and can record a log of temperature changes. The control unit 30 may be connected to a power generator or the like in addition to the commercial power supply. Further, power is supplied to the battery 31 as well. Furthermore, when a commercial power supply or a generator cannot be used temporarily, electric power stored in the battery 31 may be used.

The hot water curing apparatus 10 configured in this way is used as follows. The procedure is shown in FIG. First, the ground soil at the current location and the cement-based solidifying agent are stirred and mixed by a stirring and mixing device to carry out foot protection and ground improvement work. Next, by using the boring device 1, unconsolidated samples are collected from the hardening portion or the like into which the cement-based solidifying agent has been injected. Next, a predetermined amount of the collected unsolidified sample is injected into the tubular body or the bag body to prepare the specimen S. Then, the specimens S are arranged on the table 28 . Next, water L with a water temperature of about 20° C. is poured. Then start the standard regimen. The time from the injection of the cement-based solidifying agent to the start of standard curing is pre-curing and is included in the curing time. This pre-curing is for example 2.5 to 3.5 hours.

Next, the controller 30 controls the heater 25 so that the water temperature is maintained within the range of 20°C ± 2°C. Since the heater 25 is planar and can generate a uniform temperature on the same surface, the water L is evenly heated. Further, since the heaters 25 are provided on the side wall surface 22 and the bottom plate 23, the temperature of the water in the heat insulating tank 20 is uniformed to approximately 20° C. by convection.

In this embodiment, the case where the water L is injected after the specimen S is placed on the table 28 has been described, but the order is not limited to this order, and the water L is controlled to about 20° C. in advance. The specimen S may be placed inside.

After a predetermined period of time (for example, 27 days, 20 to 21 hours) has passed, the specimen S is taken out from the heat-retaining tank 20 and cut into a predetermined size (for example, 5 cm in diameter and 10 cm in height). Then, it is set in the uniaxial compression tester 4 . The time after removal from the heat insulating tank 20 is post-curing and is included in the curing time. This post-curing is, for example, 0.5 hours. Then, the uniaxial compression tester 4 is operated to measure the strength of the specimen S and evaluate the strength of the foot protection portion. The uniaxial compression test is preferably conducted according to JISA1216 (uniaxial compression test method for soil) or JISA1108 (compression test method for concrete).

In addition, since an elastic body such as rubber is used for the leg portion 21 and the support portion 27, it is possible to minimize the influence of the vibration transmitted from the outside on the curing, and to perform an accurate strength evaluation. becomes possible.

As described above, according to the hot water curing apparatus 10 according to the present embodiment, the specimen S can be cured in a stable environment, so that an accurate strength evaluation can be performed. At this time, since the temperature is recorded in the control unit 30, it can be confirmed that the specimen S is properly cured. In addition, since the test piece S is immersed in the water L, the outflow of water from the test piece S can be suppressed. Furthermore, since the temperature sensor 26 is arranged at a location where a downward flow is generated in the water, it is possible to accurately grasp whether or not the entire water has reached a predetermined temperature. That is, if the temperature measurement value at the portion where the downward flow is generated is the predetermined temperature, it can be determined that the entire underwater surface is at the predetermined temperature.

A Peltier element may be used instead of the heater 25. FIG. When a Peltier element is used, cooling as well as heating is possible.

In this embodiment, standard curing has been described, but special accelerated curing may also be used. In this case, the temperature is set to, for example, 55° C.±2° C., and the curing period is set to 3 days.

Also, in this embodiment, the case where the temperature sensor 26 is provided in the central portion of the heat insulating tank 20 has been described, but the position is not limited to this position. For example, multiple temperature sensors 26 on table 28 may be provided. In this case, an average value of all temperature measurements may be used.

By installing the hot water curing device 10 on the loading platform of a truck or the like, it is possible to make the vehicle V having the hot water curing function. The places where samples are collected by the boring device 1 are various construction sites, and are not always near the test site where the uniaxial compression tester 4 is installed. Therefore, if the vehicle V is equipped with the hot water curing device 10, it is possible to start curing near the place where the sample is collected, transport the vehicle to the test site where the uniaxial compression tester 4 is installed, and finish the curing. becomes. In this case, the time for pre-curing and post-curing can be taken accurately, and highly accurate strength evaluation is possible.

The hot water curing device 10 mounted on the vehicle V may be powered by a generator mounted on the vehicle V, a battery, or the like.

FIG. 4 is an explanatory diagram schematically showing a hot water curing apparatus 10A according to a modification. In addition, in FIG. 4, the same reference numerals are assigned to the same functional parts as in FIG. 2, and detailed description thereof will be omitted.

A suspension unit 40 is provided in the hot water curing apparatus 10A instead of the support portion 27 and the table 28 described above. The suspension unit 40 includes a pair of support portions 41 made of an elastic material such as rubber, a pair of pillars 42 respectively provided on the pair of support portions 41, and a wire stretched between the pillars 42. 43. For example, 24 specimens S are suspended from the wires 43 .

In the hot water curing apparatus 10A configured in this way, the same effects as those of the above-described hot water curing apparatus 10 can be obtained, and the test piece S can be entirely covered with the water L, so that the inside of the test piece S temperature change can be minimized. Furthermore, since the legs 21 and the support 41 are made of an elastic material such as rubber and suspended by the wires 43, the vibrations transmitted from the outside can be absorbed, minimizing the effect on curing. It is possible to suppress the stress and perform more accurate strength evaluation.

FIG. 5 is an explanatory diagram schematically showing a constant temperature curing device 50 according to a second embodiment of the present invention. In addition, in FIG. 5, the same reference numerals are assigned to the same functional parts as in FIG. 2, and detailed description thereof will be omitted.

In the constant temperature curing device 50, the heat insulating tank 20 is filled with air M instead of water L. When the air M is used, the temperature inside the bath tends to be uneven.

The constant temperature curing apparatus 50 configured in this way can also obtain the same effect as the warm water curing apparatus 10 described above. In this case, drying can be prevented by airtightly enclosing the specimen S in a tube or bag.

FIG. 6 is an explanatory diagram schematically showing a warm water curing apparatus (constant temperature curing apparatus) 60 according to the third embodiment of the present invention, and FIG. 7 is an explanatory diagram showing the procedure of a strength estimation method using the warm water curing apparatus 60. is.

The hot water curing device 60 includes a heat insulating bath 70 . The heat insulating tank 70 has two tanks, an upper tank 70A and a lower tank 70B. The heat insulating tank 70 is placed on the ground G or the like by means of legs 71 made of rubber or the like. Further, the heat insulating tank 70 is provided with a side wall surface 72, a bottom plate 73, a top plate 74, and a partition wall 75 which are made of a heat insulating material or the like. A planar heater 76 is provided on the side wall surface 72 and the bottom plate 73 . Each heater 76 is connected to a control section 80 which will be described later. The side wall surface 72 and the top plate 74 are configured to be openable and closable, and when closed, can be liquid-tightly closed. A temperature sensor 77 is provided inside the heat insulating bath 70 . A Peltier element 78 is provided on the partition wall 75 . The Peltier element 78 is controlled by the controller 80 so that one surface is cooled and the other surface is heated.

In the upper tank 70 A of the heat insulating tank 70 , the specimen S is placed on a table 79 provided on the partition wall 75 . In the lower tank 70</b>B of the heat insulating tank 70 , the specimen S is placed on a table 79 provided on the bottom plate 73 .

A control unit 80 for controlling each heater 76 and a battery 81 are provided outside the bottom plate 73 . The controller 80 turns ON/OFF the power supply to the heater 76 based on the temperature output value from the temperature sensor 77 described above. Note that the temperature control may be performed based on the temperature change rate instead of the temperature output value.

The control unit 80 is connected to an external power supply such as a commercial power supply, and supplies power to the heater 76 and controls the heater 76 . Further, the control unit 80 has a timer and a storage unit inside, and can record a log of temperature changes. The control unit 80 may be connected to a power generator or the like in addition to the commercial power supply. The control unit 80 also supplies charging power to the battery 81 by, for example, converting AC current from the commercial power supply into DC current. Furthermore, when a commercial power supply or a generator cannot be used temporarily, electric power stored in the battery 81 can also be used.

The hot water curing apparatus 60 configured in this way is used as follows. The procedure is shown in FIG. First, the ground soil at the current location and the cement-based solidifying agent are stirred and mixed by a stirring and mixing device to carry out foot protection and ground improvement work. Next, by using the boring device 1, unconsolidated samples are collected from the hardening portion or the like into which the cement-based solidifying agent has been injected. Next, a predetermined amount of the collected unsolidified sample is injected into the tubular body or the bag body to prepare the specimen S. Then, the specimens S are arranged on the partition wall 75 and the table 79 . Next, water L having a water temperature of about 55° C. is poured into the upper tank 70A, and water L having a water temperature of about 20° C. is poured into the lower tank 70B. Then, the special accelerated curing and standard curing are started at the same time. The time from the injection of the solidifying agent to the start of the standard curing/special accelerated curing is pre-curing and is included in the curing time. This pre-curing is for example 2.5 to 3.5 hours.

Next, the controller 80 controls the heater 76 so that the temperature of the water in the upper tank 70A is maintained within the range of 55°C ± 2°C. Since the heater 76 is planar, the water L is evenly heated, and the temperature of the water in the upper tank 70A is uniformed to approximately 55° C. by convection. On the other hand, the controller 80 controls the heater 76 so that the temperature of the water in the lower bath 70B is maintained within the range of 20°C ± 2°C. Since the heater 76 is planar, the water L is evenly heated, and the temperature of the water in the lower tank 70B is also made uniform to approximately 20° C. by convection.

After a predetermined time (for example, 2 days and 20 to 21 hours) has passed, the specimen S is taken out from the upper tank 70A and cut into a predetermined size (for example, 5 cm in diameter and 10 cm in height). Then, it is set in the uniaxial compression tester 4 . The time after removal from the tank is post-curing and is included in the curing time. This post-curing is, for example, 0.5 hours. Then, the uniaxial compression tester 4 is operated to measure the strength of the specimen S and evaluate the strength of the foot protection portion. The uniaxial compression test is preferably conducted according to JISA1216 (uniaxial compression test method for soil) or JISA1108 (compression test method for concrete).

Similarly, after a predetermined time (for example, 27 days and 20 to 21 hours) has passed, the specimen S is taken out from the lower tank 70B and cut into a predetermined size (for example, 5 cm in diameter and 10 cm in height). Then, it is set in the uniaxial compression tester 4 . The time after removal from the tank is post-curing and is included in the curing time. This post-curing is, for example, 0.5 hours. Then, the uniaxial compression tester 4 is operated to measure the strength of the specimen S and evaluate the strength of the foot protection portion.

Since the heat retaining tank 70 uses an elastic body such as rubber for the leg portion 71, it is possible to minimize the influence of vibrations transmitted from the outside.

In the control unit 80 described above, the Peltier element 78 is used to adjust the water temperature of the upper tank 70A and the lower tank 70B, for example, by heating the upper tank 70A and cooling the lower tank 70B. It can be carried out. Both sides of the Peltier element 78 can be effectively used, and power consumption can be reduced.

As described above, according to the hot water curing apparatus 60 according to the present embodiment, the specimen S can be subjected to special accelerated curing in the upper tank 70A and standard curing in the lower tank 70B. It becomes possible to take care of various kinds. In addition, since it can be cured in a stable environment, it is possible to perform an accurate strength evaluation. Furthermore, since the temperature is recorded in the control unit 80, it can be confirmed that the specimen S is properly cured. Moreover, since the test piece S is immersed in the water L, the outflow of water from the test piece S can be suppressed. A Peltier element may be used instead of the heater 76 . When a Peltier element is used, cooling as well as heating is possible.

In addition, in each of the above-described embodiments, the temperature sensor is provided in the heat-retaining tank, but it may be attached to each specimen S. Furthermore, other than water L, oil or the like having a higher specific heat than water may be used as the fluid.

Further, in the constant temperature curing apparatus and vehicle in each of the above-described embodiments, the curing target is soil cement, but the curing target is not limited to this. That is, it can be used not only for soil cement but also for curing cement milk. When curing cement milk, collect cement milk from a cement milk plant or the like. Next, a predetermined amount of the sampled unsolidified sample is injected into the tube or bag to prepare a specimen S, which is set in the hot water curing device 10 or the constant temperature curing device 50 . Even when cement milk is used as the specimen S, the same effects as those of the above-described embodiments can be obtained.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the scope of the invention. Further, each embodiment may be implemented in combination as appropriate, in which case the combined effect can be obtained. Furthermore, various inventions are included in the above embodiments, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and effects can be obtained, the configuration with the constituent elements deleted can be extracted as an invention.
The invention described in the scope of claims at the time of filing of the present application will be additionally described below.
[1]
a heat-retaining tank containing a fluid;
A planar heating element provided on the wall surface of the heat retaining tank,
a holding part for holding a test piece containing cement in the heat insulating tank;
a temperature sensor arranged in the heat retaining tank and measuring the temperature of the fluid;
A control unit that controls the temperature of the heating element based on the output value of the temperature sensor,
A constant temperature curing device that maintains the temperature of the fluid at a predetermined temperature.
[2]
a heat retaining tank having two tanks liquid-tightly partitioned by a partition wall, each containing a fluid;
A planar heating element provided on each wall surface of each tank of the heat insulating tank,
A planar Peltier element formed as the partition wall;
a holding part for holding a test piece containing cement in the heat insulating tank;
a temperature sensor for measuring the temperature of the fluid, which is arranged in each tank of the heat insulating tank;
A control unit that controls the temperature of the heating element and the Peltier element based on the output value of the temperature sensor,
A constant temperature curing device that maintains the temperature of the fluid at a predetermined temperature.
[3]
The constant temperature curing device according to [1] or [2], wherein the holding part is provided with vibration preventing means.
[4]
The constant-temperature curing apparatus according to [1] or [2], wherein the heat-retaining tank has legs having vibration-preventing means.
[5]
The constant temperature curing device according to [1], wherein the heating element is a Peltier element.
[6]
The constant-temperature curing apparatus according to [1] or [2], wherein a stirrer for stirring the fluid is provided in the heat-retaining tank.
[7]
A vehicle equipped with the constant temperature curing device according to any one of [1] to [6].

1... boring device, 4... uniaxial compression tester, 10, 10A... hot water curing apparatus, 20... thermal insulation tank, 21... legs, 22... side wall surface, 23... bottom plate, 24... top plate, 25... heater (heating element ), 26... Temperature sensor, 27... Support part, 28... Table (holding part), 30... Control part, 31... Battery, 40... Suspension unit, 41... Support part, 42... Column, 43... Wire, 50 Constant temperature curing device 51 Circulation fan 60 Hot water curing device (constant temperature curing device) 70 Thermal insulation tank 70A Upper tank 70B Lower tank 71 Leg 72 Side wall 73 Bottom plate 74... Top plate 75... Partition wall 76... Heater (heating element) 77... Temperature sensor 78... Peltier element 79... Table (holding part) 80... Control part 81... Battery S... Specimen, L...water, M...air, G...ground, Q...borehole, V...vehicle.

Claims (7)

a heat retaining tank having two tanks liquid-tightly partitioned by a partition wall, each containing a fluid;
a planar heating element provided on the side wall surface, the bottom plate, and the partition wall of each tank of the heat insulating tank;
a holding part for holding a test piece containing cement in the heat insulating tank;
a temperature sensor arranged at the center of each of the heat retaining tanks for measuring the temperature of the fluid;
a control unit that controls the temperature of the heating element based on the output value of the temperature sensor,
A constant temperature curing device that maintains the temperature of the fluid at a predetermined temperature. a heat retaining tank having two tanks liquid-tightly partitioned by a partition wall, each containing a fluid;
a planar heating element provided on each wall surface of each tank of the heat insulating tank and on the partition wall;
a holding part for holding a test piece containing cement in the heat insulating tank;
a temperature sensor for measuring the temperature of the fluid, which is arranged in each tank of the heat insulating tank;
a control unit that controls the temperature of the heating element based on the output value of the temperature sensor,
A constant temperature curing device that maintains the temperature of the fluid at a predetermined temperature. a heat retaining tank having two tanks liquid-tightly partitioned by a partition wall, each containing a fluid;
A planar heating element provided on each wall surface of each tank of the heat insulating tank,
A planar Peltier element formed as the partition wall;
a holding part for holding a test piece containing cement in the heat insulating tank;
a temperature sensor for measuring the temperature of the fluid, which is arranged in each tank of the heat insulating tank;
a control unit that controls the temperature of the heating element and the Peltier element based on the output value of the temperature sensor;
A constant temperature curing device that maintains the temperature of the fluid at a predetermined temperature. The holding part is provided with vibration prevention means,
The constant temperature curing device according to any one of claims 1-3 . The heat-retaining tank comprises a leg having a vibration damping means,
The constant temperature curing device according to any one of claims 1-3 . A stirrer for stirring the fluid is provided in the heat retaining tank,
The constant temperature curing device according to any one of claims 1-3 . A vehicle equipped with the constant temperature curing device according to any one of claims 1 to 6 .

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