JP7206539B2 - Concrete filling management method - Google Patents

Description

The present invention relates to a concrete filling management method.

In Patent Document 1 below, a measurement sensor is fixed on the lower surface of a diaphragm plate that protrudes from the inner surface of a steel pipe, and the change in the electrical characteristics of the substance interposed between the electrodes is detected by the measurement sensor. A concrete fill detection device is disclosed for detecting the

Further, in Patent Document 2 below, a measuring device is arranged on the upper surface of a base plate provided on the upper surface of the foundation of a building. A method for measuring defects such as voids in concrete is disclosed by receiving ultrasonic waves reflected by a probe again.

Japanese Patent No. 3089995 JP-A-2004-53376

In Patent Document 1, it is necessary to previously fix the measurement sensor on the lower surface of the diaphragm plate protruding from the inner surface of the steel pipe, which reduces workability and increases the cost of the measurement sensor.

In Patent Literature 2, a measuring device is arranged on the upper surface of a base plate provided on the upper surface of the foundation of a building, and a defective portion of concrete filled in the lower surface of the base plate is measured. That is, the configuration described in Patent Document 2 does not detect the filling position of concrete in the formwork.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a concrete filling management method capable of confirming from the outside of a steel pipe that the inside of the steel pipe has been filled with concrete.

A concrete filling management method according to a first aspect is a concrete filling management method for managing filling properties of concrete into a steel pipe, wherein an ultrasonic sensor is mounted at one or more locations on the outer surface of the steel pipe. A step of applying a probe, a step of filling the inside of the steel pipe with concrete from the lower side of the steel pipe, and a sound pressure change due to the presence or absence of the concrete by the ultrasonic sensor, whereby the concrete is filled. and confirming that the

According to the concrete filling management method according to the first aspect , the probes of the ultrasonic sensors are arranged at one or more points on the outer surface of the steel pipe. Furthermore, the inside of the steel pipe is filled with concrete from the lower side of the steel pipe. Then, by detecting a change in sound pressure depending on the presence or absence of concrete with an ultrasonic sensor, it is confirmed that the concrete has been filled. Thereby, it can be confirmed from the outside of the steel pipe by the ultrasonic sensor that the inside of the steel pipe is filled with concrete. Therefore, it is not necessary to visually check whether concrete is filled inside the steel pipe, as compared with the case of checking the discharge of concrete from the steam vent hole.

A concrete filling management method according to a second aspect is the concrete filling management method according to the first aspect , wherein the probe of the ultrasonic sensor is arranged at one or more locations in the height direction on the outer side of the steel pipe. , by detecting a change in sound pressure with the probe, the uplift height or uplift velocity of the concrete is measured.

According to the concrete filling management method according to the second aspect , changes in sound pressure are detected by the probes of the ultrasonic sensors arranged at one or a plurality of positions in the height direction on the outer side of the steel pipe. This makes it possible to easily manage the concrete launch height or launch height velocity.

A concrete filling management method according to a third aspect is the concrete filling management method according to the first aspect or the second aspect , wherein the ultrasonic sensor is provided with a transmission unit that transmits information on sound pressure change, The sound pressure change information transmitted from the transmitting section is received at a position distant from the transmitting section to manage the filling property of concrete.

According to the concrete filling management method according to the third aspect , the sound pressure change information from the ultrasonic sensor is transmitted from the transmission unit, and the sound pressure change information is received at a position away from the transmission unit to improve the concrete filling performance. to manage. Therefore, it is possible to manage the filling properties of concrete from a remote location, contributing to labor saving.

According to the concrete filling management method of the present invention, it can be confirmed from the outside of the steel pipe that the inside of the steel pipe is filled with concrete.

FIG. 2 is an elevation cross-sectional view showing an example in which an ultrasonic sensor used in the concrete filling management method of the first embodiment is arranged outside the steel pipe; FIG. 4 is a side view showing an example in which an ultrasonic sensor used in the concrete filling management method of the first embodiment is arranged outside the steel pipe; FIG. 4 is a cross-sectional view showing a probe of an ultrasonic sensor used in the concrete filling management method of the first embodiment; FIG. 4 is a schematic diagram showing an image of ultrasonic wave propagation by an ultrasonic sensor arranged outside a steel pipe; (A) is a diagram showing a sound pressure waveform image when the steel pipe is not filled with concrete, and (B) is a sound pressure waveform image when the steel pipe is filled with concrete. FIG. 4 is a diagram showing; (A) is a graph showing the measurement data of sound pressure against time when nothing is filled inside the steel pipe, and (B) is a graph showing the time when the steel pipe is filled with a water gel resembling concrete. is a graph showing measurement data of sound pressure against time of . FIG. 8 is a cross-sectional elevational view showing an example of wireless communication in which an ultrasonic sensor used in the concrete filling management method of the second embodiment is arranged outside the steel pipe. It is sectional drawing which shows the concrete filling management method of a comparative example.

An embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that those less relevant to the present invention are omitted from the drawing.

[First Embodiment]
A concrete filling management method according to the first embodiment will be described with reference to FIGS. 1 to 6. FIG.

FIG. 1 shows a cross-sectional elevational view of a state in which an ultrasonic sensor 10 used in the concrete filling management method of the first embodiment is arranged outside a steel pipe 100. As shown in FIG. In this embodiment, the concrete filling management method is applied to the concrete press-in method, which is one of the methods for constructing the column members of the building structure. The concrete filling management method manages the fillability of the concrete C into the inside of the steel pipe 100 .

As shown in FIG. 1, the inside of a steel pipe 100 arranged along the vertical direction is filled with concrete C from the lower side of the steel pipe 100, and the filled concrete C is solidified to form a column member. is constructed. More specifically, an injection port 102 is provided in the lower portion of the steel pipe 100, and a connecting portion 106 of an introduction pipe 104 of a concrete injection device (not shown) is connected to the injection port 102. As shown in FIG. Then, by driving a pump (not shown) of a concrete press-in apparatus, concrete C is press-injected from the introduction pipe 104 into the space S inside the steel pipe 100 . At that time, the ultrasonic sensor 10 is used to confirm the filling state of the concrete C in the space S in the steel pipe 100 .

As shown in FIG. 1, the ultrasonic sensor 10 includes a plurality of detectors 12 and a flaw detector (sensor body) 14 to which the detectors 12 are electrically connected via cables 16. . A management computer 18 is electrically connected to the flaw detector 14 via a cable 17 . As shown in FIGS. 1 and 2, the detection units 12 are arranged at a plurality of locations in the vertical direction (height direction) of the outer surface 100A of the steel pipe 100. is filled with concrete C. Here, the outer surface 100A is an example of the surface of the steel pipe 100. As shown in FIG.

FIG. 3 shows the detection section 12 in a cross-sectional view. As shown in FIG. 3, the detection unit 12 includes a probe 22 that emits ultrasonic waves and a case 24 to which the probe 22 is fixed. The case 24 is formed in a substantially cubic shape, and the probe 22 is fixed to one side from the middle portion in the thickness direction of the case 24 . An attachment surface 24A (surface opposite to the side where the probe 22 is provided) of the case 24 to the steel pipe 100 (see FIG. 1) is provided with a concave recess 25 . The concave portion 25 is, for example, substantially circular in plan view (see FIG. 2). An ultrasonic transmission surface 22A of the probe 22 is exposed on the bottom surface 25A of the recess 25 . The probe 22 is a transmitting/receiving probe that transmits ultrasonic waves and receives reflected waves of the transmitted ultrasonic waves.

The case 24 is provided with a supply path 26 for supplying water W into the recess 25 . As an example, the downstream end of the supply path 26 opens to the bottom surface 25A of the recess 25 . A film 28 that retains water W in the recess 25 by covering the opening of the recess 25 is attached to the edge of the opening of the mounting surface 24</b>A of the recess 25 . The detector 12 is provided with a tank 30 in which water W is stored. A hose 32 is connected to the bottom of the tank 30 , and the downstream end of the hose 32 in the water W supply direction is connected to the upstream end of the supply channel 26 of the case 24 . Thereby, the water W in the tank 30 is supplied into the recess 25 of the case 24 via the hose 32 and the supply path 26 .

Magnets 36 are provided on both side surfaces 24B of the case 24 in the longitudinal direction. The magnet 36 has, for example, a substantially rectangular shape, and is arranged so that the end surface of the magnet 36 is flush with the mounting surface 24A of the case 24 . 24 A of attachment surfaces of the detection part 12 are attached to 100 A of outer surfaces of the steel pipe 100 with the magnet 36 (refer FIG. 1). In this embodiment, the steel pipe 100 is substantially cylindrical, and the mounting surface 24A of the case 24 is substantially planar. In this embodiment, the magnets 36 on both sides of the case 24 in the longitudinal direction are arranged along the vertical direction of the steel pipe 100, so that the detection unit 12 is fixed to the outer surface 100A of the steel pipe 100 by the attraction force of the magnets 36 (Fig. 1 and FIG. 2).

As a result, the detection unit 12 is configured such that water W, which is a contact medium, is interposed between the ultrasonic transmission surface 22A of the probe 22 and the steel pipe 100 (see FIG. 1). The detection unit 12 can maintain its sensitivity to ultrasonic waves by interposing water W between the transmission surface 22A of the probe 22 and the steel pipe 100 . Although illustration is omitted, the case 24 is provided with a support portion that supports the tank 30 so that the hose 32 is on the lower side with the magnets 36 on both sides in the longitudinal direction of the case 24 arranged vertically. .

The detection unit 12 detects changes in sound pressure depending on whether the steel pipe 100 is filled with the concrete C or not. That is, by detecting a change in sound pressure, that is, a change in voltage, depending on the presence or absence of concrete C inside the steel pipe 100 by the detection unit 12, it is confirmed that the inside of the steel pipe 100 is filled with the concrete C.

FIG. 4 shows an image of ultrasonic waves propagated by the detection unit 12 . As shown in FIG. 4 , the inside of the steel pipe 100 is not filled with concrete C at the position of the detector 12 arranged on the upper side in the vertical direction of the steel pipe 100 . In this case, the ultrasonic wave indicated by arrow A1 transmitted from the probe 22 of the detection unit 12 in the direction of the steel pipe 100 through the water W is reflected by the inner surface (back surface) 100B of the steel pipe 100, and is indicated by the arrow A2. Most of the ultrasonic waves are again received by the probe 22 as shown. That is, the ultrasonic waves emitted from the probe 22 are not propagated when there is a space S inside the steel pipe 100, and most of them return to the probe 22 as reflected waves. As a result, as shown in FIG. 5A, the detector 12 detects a strong electric signal waveform (sound pressure waveform) 40 whose peak reaches the reference height H. As shown in FIG.

On the other hand, as shown in FIG. 4 , the inside of the steel pipe 100 is filled with concrete C at the position of the detector 12 arranged below the steel pipe 100 in the vertical direction. In this case, most of the ultrasonic waves indicated by the arrow B1 transmitted from the probe 22 of the detection unit 12 in the direction of the steel pipe 100 through the water W are the inner surface of the steel pipe 100 ( Back) Propagate into concrete C from 100B. Another part of the ultrasonic wave is reflected by the inner surface (back surface) 100B of the steel pipe 100 as indicated by an arrow B3, and is received by the probe 22 again. That is, when the inside of the steel pipe 100 is filled with concrete C, most of the ultrasonic waves transmitted from the probe 22 are propagated to the concrete C. As a result, as shown in FIG. 5B, the detector 12 detects a weak electrical signal waveform (sound pressure waveform) 42 whose peak does not reach the reference height H. As shown in FIG.

In this embodiment, since the plurality of detection units 12 of the ultrasonic sensor 10 are arranged in the vertical direction (height direction) of the steel pipe 100, the detection signals detected by the plurality of detection units 12 detect the inside of the steel pipe 100. is measured. In addition, by measuring the filling detection time of the concrete C by each detection unit 12 from the start of press-in of the concrete C, the height of each detection unit 12 from the injection port 102 can be used to determine the concrete C inside the steel pipe 100. is measured. The measurement of the launch height velocity of the concrete C is executed by a program stored in the storage section of the computer 18, for example.

(Action and effect)
Next, the operation and effects of this embodiment will be described.

In the concrete filling management method, detection units 12 of ultrasonic sensors 10 are arranged at a plurality of locations on the outer surface 100A of the steel pipe 100 . As a result, the probe 22 is arranged on the outer surface 100A of the steel pipe 100 with the water W therebetween. Further, the inside of the steel pipe 100 is filled with concrete C from the lower side of the steel pipe 100 by press-fitting. Then, by detecting sound pressure changes, ie, voltage changes, due to the presence or absence of concrete C by the plurality of detection units 12 of the ultrasonic sensor 10, it is confirmed that the inside of the steel pipe 100 is filled with concrete C. Accordingly, it is possible to confirm that the inside of the steel pipe 100 is filled with the concrete C by the plurality of detection units 12 of the ultrasonic sensor 10 from the outside of the steel pipe 100 .

FIG. 8 shows a concrete filling management method of a comparative example. As shown in FIG. 8, a steam vent hole 204 is formed in the steel pipe 202 . The steam vent hole 204 is pre-drilled in the steel pipe 202 at a factory or the like in order to reduce the steam pressure generated by the concrete C inside the steel pipe 202 in the event of a fire. A plurality of steam vent holes 204 are formed at intervals in the axial direction of the steel pipe 202 . For example, the steam vent holes 204 are formed at two locations within a predetermined axial length (for example, about 5 m) of the steel pipe 202 . When the concrete C is press-fitted into the steel pipe 202 from below, the steam vent hole 204 is not plugged 206, and the steam vent hole 204 is used to check the filling height of the concrete C.

When the concrete C reaches the steam vent hole 204 inside the steel pipe 202 , the concrete C is discharged from the steam vent hole 204 . In the concrete filling control method of the comparative example, by visually observing the discharge of the concrete C from the air vent hole 204, it is confirmed that the concrete C is filled up to the position of the steam vent hole 204 inside the steel pipe 202. After that, a stopper 206 is fitted into the steam vent hole 204 of the steel pipe 202 as a slag stopper. The plug 206 is formed such that its outer diameter gradually increases from one axial end to the other end, and the one end of the plug 206 having a smaller outer diameter is inserted into the steam vent hole 204 of the steel pipe 202. . The plug 206 is removed after the concrete C hardens.

In the concrete filling control method of the comparative example, the steam vent holes 204 are arranged, for example, at two locations within a predetermined length range (for example, about 5 m) in the axial direction of the steel pipe 202, and the filling of the concrete C is confirmed. There are few data for Moreover, if there is an obstacle such as a diaphragm inside the steel pipe 202, it is difficult to confirm the filling of the concrete C. In addition, many man-hours are used to confirm the uplift height of the concrete C inside the steel pipe 202 .

On the other hand, in the concrete filling management method of the present embodiment, the detection units 12 of the ultrasonic sensor 10 are arranged at a plurality of locations on the outer surface 100A of the steel pipe 100, and the plurality of detection units 12 detect the presence or absence of the concrete C. Detect pressure changes. Therefore, in the concrete filling management method of the present embodiment, it is not necessary to visually confirm filling of the concrete C into the steel pipe 100 . In addition, since a plurality of detection units 12 detect changes in sound pressure depending on the presence or absence of concrete C, the number of man-hours for confirming the rising height of concrete C inside steel pipe 202 can be reduced. Also, by increasing the number of detection units 12 with respect to a predetermined length (for example, about 5 m) of the steel pipe 202 in the axial direction, filling of the concrete C can be detected more reliably.

Further, in the concrete filling management method of the present embodiment, the detection units 12 of the ultrasonic sensors 10 are arranged at a plurality of locations on the outside of the steel pipe 100 in the height direction. Then, the sound pressure change is detected by a plurality of detectors 12, and the position of the detector 12 where the sound pressure change is detected and the speed at which the sound pressure change is detected are calculated. Measure the launch height and launch height speed (feed rate during press-fitting). Therefore, it is possible to easily manage the launch height and the launch height speed of the concrete C.

Next, an experiment for verifying detection of sound pressure change by the detection unit 12 of the ultrasonic sensor 10 will be described. In this experiment, the inside of the steel pipe 100 was filled with a water gel in the image of concrete C. Then, the sound pressure was measured by the detector 12 arranged outside the steel pipe 100 . FIG. 6A shows sound pressure measurement data obtained by the detection unit 12 when there is no water gel inside the steel pipe 100, and FIG. FIG. 2 shows measurement data of sound pressure by the detection unit 12. FIG.

In the measurement data shown in FIGS. 6A and 6B, the vertical axis indicates the intensity of the electrical signal, and the horizontal axis indicates time. In the measurement data, the first peak of the transmission wave is the surface wave, and the second peak is the back surface wave. The third peak is the second surface wave. The waveform detected in this manner is attenuated. It can be seen that in the measurement data shown in FIG. 6B, the sound pressure of the backside wave indicated by the dashed circle is lower than in the measurement data shown in FIG. 6A. Therefore, when the steel pipe 100 is filled with water gel, part of the ultrasonic wave is propagated through the water gel, and the sound of the back surface wave is reduced compared to when the steel pipe 100 does not have water gel. It can be seen that the pressure drops.

[Second embodiment]
Next, a concrete filling management method according to the second embodiment will be described with reference to FIG. In addition, about the same component part as 1st Embodiment mentioned above, the same number is attached and the description is abbreviate|omitted.

As shown in FIG. 7, an ultrasonic sensor 50 is used in the concrete filling management method of the second embodiment. The ultrasonic sensor 50 includes a plurality of detection units 12 and a flaw detector (sensor body) 52 to which the detection units 12 are electrically connected via cables 16, respectively. A terminal 54 is electrically connected to the flaw detector 52 via a cable 53 . The terminal device 54 includes a transmission unit 54A that transmits detection data input from the flaw detector 14 by wireless communication, and a display unit 54B that displays the detection data.

In addition, a management terminal 56 is arranged at a location away from the terminal 54 . The terminal 56 includes a receiving section 56A that receives the detected data transmitted from the transmitting section 54A of the terminal 54 by wireless communication, and a display section 56B that displays the detected data.

The detectors 12 are arranged at a plurality of locations in the vertical direction (height direction) of the outer surface 100A of the steel pipe 100, and detect whether or not the inside of the steel pipe 100 is filled with concrete C at the positions of the detectors 12. When the presence or absence of the concrete C is detected by the detector 12 , the detection signal detected by the detector 12 is input to the flaw detector 52 . The detection data detected by the plurality of detectors 12 are output from the flaw detector 52 and input to the terminal 54, and displayed on the display 54B of the terminal 54. FIG. The inspector can check the inspection data on the display section 54B of the terminal 54. FIG. The detection data transmitted from the transmission unit 54A of the terminal 54 is received by the reception unit 56A of the management terminal 56 by wireless communication and displayed on the display unit 56B. At this time, the detected data may be synchronized with the terminal 54 by wireless communication, and the detected data may be synchronized with the management terminal 56 via the server. The filling date and time of the concrete C, the filling time, the rising height of the concrete C, the rising speed of the concrete C, and the like are managed by the terminal device 56 .

In the above-described concrete filling management method, the sound pressure change information from the ultrasonic sensor 50 is transmitted from the transmission unit 54A, and the sound pressure change information is received at a location away from the transmission unit 54A to manage the filling property of the concrete C. do. Therefore, it is possible to manage the filling property of the concrete C from a remote location, which contributes to labor saving.

〔supplementary explanation〕
In the ultrasonic sensors 10 and 50 of the first and second embodiments, the number of detection units 12 can be changed, and one or two or more detection units 12 may be provided. That is, in the concrete filling management method of the present invention, the probe of the ultrasonic sensor may be arranged at one place in the height direction on the outer side of the steel pipe.

In addition, in the second embodiment, a transmission unit for transmitting inspection data may be provided in the flaw detector 52 without providing the terminal 54, and the inspection data may be received by the receiving unit of the management terminal 56. . "The ultrasonic sensor is provided with a transmitter that transmits information about changes in sound pressure" of the present invention means that a transmitter that transmits information about changes in sound pressure is directly provided in a constituent part of the ultrasonic sensor. In addition to the case where the ultrasonic sensor is present, it also includes the case where another part connected to the ultrasonic sensor is provided with a transmission section that transmits information on changes in sound pressure.

Although the present invention has been described in detail with respect to particular embodiments, it should be understood that the invention is not limited to such embodiments and that various other embodiments are possible within the scope of the invention. clear to the trader.

10 Ultrasonic sensor 22 Probe 50 Ultrasonic sensor 54A Transmission unit 56A Reception unit (receives sound pressure change information)
100 Steel pipe 100A outer surface (an example of the surface)
C Concrete

Claims (2)

A concrete filling control method for controlling filling properties of concrete into a steel pipe,
A step of arranging probes of a plurality of ultrasonic sensors for confirming filling of concrete by detecting sound pressure changes due to the presence or absence of concrete in the height direction of the outer surface of the steel pipe;
filling the inside of the steel pipe with concrete from the lower side of the steel pipe;
By measuring the filling detection time of the concrete by the probe of each of the ultrasonic sensors from the time when the concrete was started to be pressed into the concrete, the height from the injection hole of the probe of each of the ultrasonic sensors, measuring the run-up height and run-up velocity of the concrete inside the steel pipe ;
Concrete filling management method having. The ultrasonic sensor is provided with a transmission unit that transmits information on changes in sound pressure,
2. The concrete filling control method according to claim 1, wherein the information on the change in sound pressure transmitted from the transmission unit is received at a position remote from the transmission unit to control the filling properties of the concrete.

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