JPH07238548A - Position measurement method and device of concrete upper surface - Google Patents

Abstract

PURPOSE:To grasp concrete placement conditions fast with high degree of accuracy by arranging temperature sensors and heaters as a pair to a plurality of longitudinal places in the hollow inside of a protection pipe, and sensing variations in temperature difference between reference temperature value measured with dummy temperature sensors and a temperature sensor in a setting position of a concrete upper surface. CONSTITUTION:A protection pipe 8a of a sensor device is so provided inside a hole 4 bored in the ground 3 in advance that it becomes a position used for a concrete upper surface 6a in a concrete placement place at a position on the longitudinal way. In the case concrete 6 is placed, every heater 12 in measurement places of the sensor device is heated, at the same time, temperature is measured at the measurement places with temperature sensors 11 and 11a, and temperature difference between reference temperature value measured with the temperature sensors 11 and 11a in the dummy measurement places and temperature value measured with temperature sendors in another temperature measurement places is monitored with a control device 9. Temperature difference in the dummy measurement places is increased in the measurement places, and when the temperature difference is in excess of threshold of a temperature difference to be set, it is informed to a worker that the concrete upper surface 6a reaches a specific position, and the placement of the concrete 6 is stopped.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention measures the position of the top of concrete cast in a drilling hole or in a formwork when constructing a concrete structure such as a cast-in-place pile or a continuous underground wall. The present invention relates to a method for measuring the position of a concrete top to control the height of concrete and the filling property of the concrete, and a position measuring device used therefor.

[0002]

2. Description of the Related Art Conventionally, as an example, when constructing a cast-in-place pile, it is necessary to confirm whether or not a predetermined height has been reached when placing concrete in a drilled hole. As shown in FIG. 6, concrete is placed in a hole 4 drilled in a ground 3 from a concrete mixer truck 1 via a tremie pipe 2, and a string 5 provided by a worker is provided with a scale each time.
Was lowered from above and the distance to the top of the cast concrete 6 was measured.

[0003]

However, in the above-described method for measuring the top end of pouring concrete, each time the concrete mixer truck 1 pours concrete,
The operator has to take down the string 5 for each measurement, which is very time-consuming and inefficient, and it is inconvenient because it cannot be measured during the placing of concrete. Since the measurement accuracy is poor due to irregularities, etc., there is a problem in that the extra thickness is thickened for safety and there is much waste.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and apparatus for efficiently and accurately measuring the top end of cast concrete.

[0005]

The gist of the method for measuring the top end position according to the present invention to solve the above-mentioned problems and achieve the above-mentioned object is to provide an appropriate interval in the longitudinal direction in the hollow inside of the whole rod-shaped protection tube. A sensor means having a temperature sensor and a heater arranged in pairs at a plurality of positions, a temperature measuring means electrically connected to the temperature sensor, a heater heating means electrically connected to the heater, and the temperature measuring means. A position measuring device for the concrete top is formed by processing the temperature data transmitted from the means and the control means for controlling the heater heating means, and the protective pipe of the sensor means is placed in the concrete at an intermediate position in the longitudinal direction. Place it so that it will be the concrete top of the place, and when the concrete is placed, heat the heater and use the temperature sensor. The temperature of the concrete top is measured by detecting the change in the temperature difference between the reference temperature value measured by the dummy temperature sensor among the plurality of temperature sensors and the temperature sensor at the set position of the concrete top. It depends on what you do.

Further, the top end position measuring device comprises a sensor means in which a temperature sensor and a heater are arranged in pairs at a plurality of positions at appropriate intervals in the hollow inside of the whole rod-shaped protection tube, and the above-mentioned temperature. From a temperature measuring means electrically connected to the sensor, a heater heating means electrically connected to the heater, and a control means for processing the temperature data transmitted from the temperature measuring means and controlling the heater heating means. It will be.

[0007]

According to the method for measuring the position of the top of concrete according to the present invention, when the heater is heated in the sensor means and the temperature at that location is measured by the temperature sensor, the placed concrete is gradually filled and the protective pipe of the sensor means is closed. When they are surrounded from the bottom in order and surrounded by pouring concrete, the thermal conductivity of the surroundings changes, so that the heat radiation amount of the heater increases and the temperature decreases. Therefore, since the dummy temperature sensor on the uppermost part of the protective tube of the sensor means is not surrounded by the cast concrete, the temperature difference from it is rapidly increased.

This temperature difference is processed and discriminated by the control means, and the measured temperature of the temperature sensor at a predetermined location set in advance by the program is lowered so that the temperature difference from the dummy temperature sensor exceeds the predetermined fluctuation range. When there is a change, the control means determines that the concrete top has reached a predetermined position, and notifies this on the display or by various notification methods such as voice.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view conceptually showing an implementation state by the method for measuring the position of the concrete crown according to the present invention. 2 to 3 are detailed diagrams of each part of the top position measuring device, and FIGS. 4 to 5 are explanatory diagrams of the determination method. For ease of understanding, the same reference numerals are given to the portions corresponding to the conventional example.

In the method for measuring the position of the concrete crown according to the present invention, as shown in FIG. 1, the sensor means 8 of the position measuring device 7 for the concrete crown is set at the position of the concrete crown 6a in the hole 4. When the placed concrete 6 reaches the sensor means 8, the control means 9 processes the temperature data from each temperature sensor so that the concrete top 6a reaches a predetermined height position. Is to detect.

First, the position measuring device 7 for the concrete crown will be described. As shown in FIGS.
The temperature sensor 11 is provided in the hollow inside of the protection rod 8a having a rod shape.
11a and the heater 12 are arranged in pairs. The temperature sensor 11, 11a and the heater 12 are paired to form the sensor means 8 by arranging the temperature sensor 11 and 11a at a plurality of positions (for example, about 4 to 5 positions) at appropriate intervals in the longitudinal direction of the protection tube 8a.

The protective tube 8a has an outer diameter of 3.
It is a protective tube made of stainless steel having a length of 2 mm and a length of about 800 mm.

There are two temperature sensors 11 and 11a at one measuring point. The temperature sensor 11a is used as a compensating sensor, and the heat effect of the heater 12 is blocked by a heat insulating material 13 such as Teflon so that the temperature at the one measuring point is increased. It is designed to eliminate the effects of thermal disturbance. That is, if thermal disturbance such as convection or a temperature change of surrounding substances gives the same temperature change to both temperature sensors 11 and 11a at one measurement point, the temperature difference between the temperature sensors 11 and 11a (T =
Ta-Tb) is only the temperature due to the heat radiation of the heater 12.

The temperature sensors 11 and 11a at a plurality of measuring points are electrically connected to the temperature measuring means 14, respectively, and the heaters 12 are also electrically connected to the heater heating means 15, respectively. These connecting cables are indicated by reference numeral 10.

Then, the temperature data transmitted from the temperature measuring means 14 is processed, the heater heating means 15 is controlled, and further, it is programmed to inform the outside that the concrete top 6a has reached a predetermined position. The control means 9 is provided to form the concrete crown top position measuring device 7 of the present invention. FIG. 3 shows the overall appearance of the sensor means 8 and the connection cable 10.

Next, a method for measuring the position of the concrete top 6a will be described with reference to FIGS. First, in the state where the top end 6a of the cast concrete 6 has not reached the lower part of the sensor means 8, the measured temperature values of the respective measurement points are the same, and the temperature difference is zero.

Next, when the concrete top 6a reaches the measurement point of the sensor means 8, the heater 1
The heat of 2 is taken by the concrete 6 that surrounds the surroundings, the amount of heat radiation increases, and the measured temperature value decreases. This is because the heat of the heater 12, which is heated by the heater heating means 15 being supplied with a constant current, radiates the heat to the surrounding substances through the protective tube 8a. Of the measured temperature value of the measurement point that is not yet surrounded by concrete (for example, the measurement point of the uppermost part of the protective tube 8a is used as a dummy) has a temperature difference between growing.

Therefore, as shown in FIG. 5, due to the approach and arrival of the concrete 6 at the measurement point, the temperature difference with other measurement points increases, and eventually becomes a constant temperature difference over time.

Next, when the top end 6a of the concrete 6 approaches or reaches the measuring point, the temperature difference between the measuring point and the other measuring points becomes large, and eventually becomes a constant temperature difference.

As described above, before the concrete 6 arrived, there was no temperature difference between the measurement points, but the concrete top 6a reached the sensor means 8 in order from the bottom, so that the measurement points →→→→ The part where the temperature difference becomes large moves.

Since the moved measurement point coincides with the ascending movement of the concrete top 6a, if there is a large difference in temperature at the measurement point in the control means 9 and there is a change, an external worker etc. The concrete top 6a can be displayed on the display or sounded by voice.
Is programmed to signal that the player has reached a predetermined position.

In this case, how much the change in the temperature difference at the measurement point determines that the concrete top 6a has reached is a matter determined by simulation or the like. In addition, as an experimental example, when the arrival of the concrete top 6a was indicated, the measured value of the height of the concrete was ± 0.5 cm with respect to the set value.

Using the concrete top position measuring device 7 constructed as described above, as shown in FIG.
The protective tube 8a of the sensor means 8 is previously arranged in the hole 4 drilled in the middle so as to be a position which should be the concrete top end 6a of the concrete pouring place at an intermediate position in the longitudinal direction thereof (for example, the position of the measuring point). Keep it.

Then, when the concrete 6 is poured, the heaters 12 at the respective measurement points of the sensor means 8 are all heated and the temperature is measured at the respective measurement points by the temperature sensors 11 and 11a, and the dummy measurement points are set. Of the reference temperature value T measured by the temperature sensors 11 and 11a of FIG.
The temperature difference between the temperature values T1, T2, T3 and T4 measured in a is monitored by the control means 9.

Then, at the measurement point, the temperature difference between the dummy measurement point and the next temperature difference becomes larger, and when the temperature difference becomes larger than the set temperature difference threshold value, the concrete temperature is increased. An operator is informed that the end 6a has reached a predetermined position. Therefore, the placing of the concrete 6 is stopped.

In this way, the pouring condition of the concrete 6 is grasped in real time, the accuracy of measuring the pouring height of concrete is improved, and a string is struck each time concrete is poured by the concrete mixer truck as in the conventional case. The troublesome measurement work of measuring the pouring height of concrete is improved.

[0027]

As described above, according to the method for measuring the position of the concrete crown of the present invention, the temperature sensor and the heater are paired at a plurality of positions in the hollow interior of the whole rod-shaped protection tube at appropriate intervals in the longitudinal direction. And a temperature measuring unit electrically connected to the temperature sensor, a heater heating unit electrically connected to the heater, and processing temperature data transmitted from the temperature measuring unit. A control device for controlling the heater heating device forms a position measuring device for the concrete top end, and the protective pipe of the sensor means is located at a midway position in the longitudinal direction of the concrete top end of the concrete pouring position. So that when the concrete is poured, the heater is heated and the temperature is measured by the temperature sensor,
Among the plurality of temperature sensors, the position of the concrete crown is measured by detecting the change in the temperature difference between the reference temperature value measured by the dummy temperature sensor and the temperature sensor at the setting position of the concrete crown. Therefore, there is an excellent effect that the placing condition of concrete can be grasped quickly and accurately and the position of the concrete top can be accurately set to a predetermined height.

In addition, the position measuring device for the concrete crown used in the position measuring method is such that a temperature sensor and a heater are paired at a plurality of positions at appropriate intervals in the longitudinal direction inside the hollow inside of the whole rod-shaped protection tube. The arranged sensor means, the temperature measuring means electrically connected to the temperature sensor, the heater heating means electrically connected to the heater, the temperature data transmitted from the temperature measuring means, and the heater. Since it consists of control means for controlling the heating means, when the placed concrete reaches the sensor means, it is grasped as a temperature difference by the temperature data from the temperature sensor, and the position of the concrete crown is measured in real time. There is an excellent effect that the measurement is not performed and the measurement accuracy is remarkably improved.

[Brief description of drawings]

FIG. 1 is a conceptual explanatory diagram of an implementation state of a method for measuring the position of a concrete crown according to the present invention.

FIG. 2 is an overall configuration diagram in which a part of a concrete crown position measuring device is omitted.

FIG. 3 is an external view of a sensor means and a connection cable of the position measuring apparatus for the top of the concrete.

FIG. 4 is an explanatory view showing how the position of the concrete top is measured by the sensor means of the concrete top position measuring device.

FIG. 5 is a chart showing changes in temperature difference when concrete reaches the sensor means.

FIG. 6 is an explanatory diagram showing a method for measuring a concrete crown according to a conventional example.

[Explanation of symbols]

 3 ground, 4 holes, 6 concrete, 6a concrete top, 7 concrete position measuring device, 8 sensor means, 8a protection tube, 9 control means, 10 connecting cable, 11, 11a temperature sensor, 12 heater, 13 heat insulation Material, 14 temperature measuring device, 15 heater heating means.

Claims (2)

[Claims] 1. A sensor means in which a temperature sensor and a heater are arranged in pairs at a plurality of positions at appropriate intervals in the hollow inside of a whole rod-shaped protection tube, and is electrically connected to the temperature sensor. Position measuring device for concrete crown with temperature measuring means, heater heating means electrically connected to the heater, and control means for processing the temperature data transmitted from the temperature measuring means and controlling the heater heating means And the rod-shaped body of the sensor means is arranged at a midway position in the longitudinal direction so as to be a position to be the concrete top end of the concrete pouring place, and when the concrete is poured, the heater is heated. A temperature is measured by the temperature sensor together with a reference temperature value measured by a dummy temperature sensor among the plurality of temperature sensors, A method for measuring the position of a concrete crown by detecting a change in temperature difference between a temperature sensor and a set position of the crown, and measuring the position of the concrete crown. 2. A sensor means in which a temperature sensor and a heater are arranged in pairs at a plurality of positions at appropriate intervals in the longitudinal direction of the hollow inside of the whole rod-shaped protection tube, and the temperature sensor is electrically connected to the temperature sensor. Concrete comprising a temperature measuring means, a heater heating means electrically connected to the heater, and a control means for processing the temperature data transmitted from the temperature measuring means and controlling the heater heating means. Top position measuring device.