JP2000257263A - Instrument and method for measuring concrete crest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instrument and a method for measuring a concrete crest in which the height of the concrete crest to be pressed in a steel tubular column and the press-fit speed can be automatically measured with excellent accuracy on the real time basis. SOLUTION: A top plate 5 having a through center opening 5a and a measuring instrument 6 are placed on an upper portion of an erected steel tubular column. The measuring instrument 6 comprises a laser beam range finder 8 and a personal computer (hereinafter, referred to as PC) 9, and the PC 9 comprises a control means of the laser beam range finder 8, a data operating means, a display means of the result, and an operating means of the measuring instrument 6. The measurement is started together with the laser beam emission by the key operation of the PC 9, a concrete is press-filled in the steel tubular column 2 and the distance to the crest CL is measured. The result of measurement is sequentially operated, and displayed on the PC 9 on the real time basis. A communication means is provided with the PC 9, and remotely operated by a PC 10 on the ground level away from the laser beam range finder 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring apparatus and a measuring method of a height of a top end of concrete to be press-fitted into a steel pipe column and a press-fitting speed when a column having a fillable steel pipe concrete (hereinafter referred to as CFT) structure is constructed. .

[0002]

2. Description of the Related Art Recently, a CFT structure has been widely adopted in which concrete is press-fitted and filled into a steel pipe column so that the characteristics of the steel pipe and the concrete are synergistically exhibited.

[0003] The mainstream of the construction of this CFT structure column is a method of press-fitting concrete from a press-in port provided in a column base of a steel pipe column. In this method, when the concrete injection speed is set low and concrete is injected, the diaphragm can be reliably filled without putting unnecessary load on the steel pipe column. There is a concern that the fluidity of concrete may decrease. Increasing the press-fitting speed can shorten the construction time and shorten the construction period.However, an excessive load is applied to the steel pipe column, and when passing through the diaphragm, the viscosity of the concrete and the weight of the already press-fitted concrete are increased. As a result, the concrete is not pushed up smoothly, and the high pressure acts on the inner wall of the steel pipe column, which may cause the steel pipe column to partially expand and deform or break.

[0004] Therefore, the control of the press-in speed is extremely important, and the recommended value of the control standard is 1 m / min or less (CFT structural technical guideline of the Association of New Urban Housings).

Conventionally, this press-fitting speed is confirmed by visually observing the moving state of the concrete top that has been press-fitted from the opening above the steel pipe column, or by calculating the average press-fitting speed from the press-in start time and the press-in end time. It had been.

[0006]

However, in the conventional visual check, it is necessary to always visually check the inside of the steel pipe column, which is a high place, during the press-fitting of concrete, which poses a danger to the operator. However, there is a problem that sufficient control cannot be performed because the press-fitting speed cannot be grasped as a numerical value, so that it is only a guide. Further, when constructing a high column having a press-fitting height of 10 m or more, it was almost impossible to visually check the top end position of the press-fitting concrete during the construction.

Further, the method of calculating the average press-in speed from the press-in start time and the press-in end time only allows the average press-in speed to be confirmed after the concrete press-in, and includes the time during which the casting was interrupted by replacing the ready-mix concrete car. It was not possible to confirm in real time whether or not the press-fitting speed, which varies gradually according to the amount and height of the concrete already press-fitted, was always kept at the recommended value.

In view of the above-mentioned problems, the present invention provides a concrete top measuring device and a measuring method capable of automatically and accurately measuring a concrete top height and a press-fitting speed for press-fitting into a steel pipe column in real time. Aim.

[0009]

In order to achieve the above object, in the measuring apparatus and method for measuring the top of concrete according to the present invention, concrete is pressed into a standing steel pipe column from its column base. Then, the concrete top height and the concrete press-in speed are sequentially measured by measuring means for automatically measuring using a laser.

That is, since a laser is used for the measuring means,
Due to the excellent directivity of the laser, it can be easily measured even at a distant place, and extremely high accuracy can be measured by utilizing the stability of the frequency peculiar to the laser. Values can be objectively grasped as numerical values.

Further, since the height of the top end can be measured without contacting the concrete to be measured only by irradiating the top end of the concrete with a laser, accurate press-fitting can be performed without applying an unnatural load to the concrete by the measurement. The speed can be measured, and an excellent effect that the working efficiency is not reduced is exhibited. Furthermore, there is no need to perform an operation that involves the danger that the worker visually observes the inside of the steel pipe column, which is located at a high place, during the press-fitting of the concrete, and the safety of the worker can be ensured.

In addition, while the concrete is being pressed in, the height of the top and the press-in speed are automatically and sequentially measured.
Even during the concrete injection, the concrete top height and the injection speed can be sequentially measured and confirmed in real time. That is, even when an abnormality occurs in the concrete press-fitting state, the change can be immediately grasped, so that the concrete press-fitting speed can be adjusted to avoid applying excessive pressure to the steel pipe column, When the press-fitting speed of the concrete to be press-fitted by the weight of the press-fitted concrete decreases, the press-in pressure is increased to increase the press-fitting speed of the concrete, thereby achieving an extremely excellent effect that the construction time can be shortened. .

[0013] Further, at the point when the top of the concrete passes through the diaphragm in the steel pipe column, it is possible to expect a dense concrete filling property by temporarily reducing the press-in speed of the concrete.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a state of construction of a steel pipe column to which a measuring device for a concrete top is applied. A press-in port 2a is provided in a column base of the steel pipe column 2 which is erected. 2a, a concrete pump 3a of a concrete pump truck 3 parked close to the concrete pumping pipe 4a.
, And fresh concrete supplied from a concrete mixer truck (not shown) is sequentially pressed into the steel pipe column 2.

At the top of the steel pipe column 2, a top plate 5 having a central opening 5a penetrating therethrough from the upper opening of the steel pipe column 2 is provided, and a measuring device 6 is mounted on the top plate 5. Is placed.

FIG. 2 shows the details of the measuring device 6. The measuring device 6 includes a laser distance meter 8 serving as a measuring means.
And a personal computer (hereinafter, referred to as a PC) 9. The PC 9 includes an operation unit of the measuring device 6, a control unit that operates the laser distance meter 8 according to the operation, and
Processing means for calculating measurement data of the laser distance meter 8 and display means for displaying the calculation result are provided.

Here, the laser range finder 8 has an irradiation optical system and a light receiving optical system therein, and receives laser light emitted from the irradiation optical system through an entrance / emission port directed downward. The object is illuminated, and the reflected light is received by the light receiving optical system through the same entrance and exit ports, and the distance is accurately measured by using the interference of the reflected light with the irradiated light. The measurement accuracy in the range is ± 3 mm, which can be measured with extremely high accuracy.

The laser range finder 8 is suspended at the center of the tripod 7, and the tripod 7 is hung on the central opening 5a of the top plate 5 so that the entrance and exit are directed to the bottom of the steel pipe column 2 and the concrete top CL. Set up to pass.

The PC 9 assigns a function as an operating means to one of the keys, such as emission and stop of laser, start and end of measurement, and switching of display method. Further, the control means built in the PC 9 emits and stops the laser in conjunction with the key operation so that the laser range finder 8 can be remotely operated by operating the keys assigned as described above. , Measurement is started and ended, and data is taken in at regular intervals (for example, every 1 second) using the clock cycle of the PC. It is set so as to convert the height of the end CL, the rising speed of the top end CL, and the like, and to convert these calculation results into data for graphic display. Also,
These processing results are set to be displayed on a display serving as a display unit of the PC 9.

For the measurement by the measuring device 6, first, the concrete pumping pipe 4 of the concrete pump 3a is connected to the press-in port 2a of the steel pipe column 2, and the laser emission key and the measurement start key of the PC 9 are set in a state where the concrete is not pressed. To start the measurement, and measure the state where concrete is not filled at regular time intervals,
Transfer to 9. Next, concrete is injected by the concrete pump 3a while continuing this measurement,
The distance of the concrete top CL is measured. At this time, the measurement data is sequentially transferred to the PC 9 from the start of the measurement, and is processed and graphically processed by the processing means, and the height and press-in speed of the top CL of the concrete are displayed in real time as numerical values and graphs on the PC 9. Will be displayed.

While watching the display, the position of the concrete top CL is confirmed, and when the concrete top CL reaches the required height, the concrete pumping from the concrete pump 3a is stopped. And PC
The measurement is terminated by operating the laser stop key 9 and the measurement end key.

In the measuring apparatus and measuring method of the concrete top shown in this embodiment, a laser is used for the measuring means, so that the excellent directivity of the laser makes it possible to easily measure even a distant place. Can be done,
By utilizing the stability of the frequency peculiar to the laser, extremely high-precision measurement can be performed, and the value can be objectively grasped as a numerical value.

In addition, since the height of the top CL can be measured without contacting the concrete, which is the object to be measured, only by irradiating the top CL of the concrete with the laser, the measurement can be performed accurately without applying an unnatural load to the concrete. In addition to being able to measure the press-fitting speed, there is an excellent effect that the working efficiency is not reduced. Furthermore, it is not necessary for the worker to visually check the inside of the steel pipe column 2 at a high place when the concrete is press-fitted, and the safety of the worker can be ensured.

In addition, while the concrete is being pressed, the height CL of the top CL and the pressing speed are automatically measured sequentially, so that the height CL of the top of the concrete and the pressing speed can be sequentially measured even during the pressing of concrete. Can be measured and confirmed. That is, even when an abnormality occurs in the press-fit state of the concrete, the change can be immediately grasped, so that the press-in speed of the concrete can be adjusted to avoid applying excessive pressure to the steel pipe column 2 and When the press-fitting speed of the concrete to be pressed in is reduced by the weight of the already-pressed concrete, it is possible to increase the press-in pressure to increase the press-in speed of the concrete and shorten the construction time. Play.

At the point when the top of the concrete passes through the diaphragm in the steel pipe column 2, it is possible to expect a dense concrete filling property by temporarily reducing the press-in speed of the concrete.

FIG. 3 shows an example of the contents displayed on the display during measurement. In this example, the elapsed time is measured using a line graph in which the vertical axis is set to height (m) and the horizontal axis is set to elapsed time (minutes). , The fluctuation of the height of the concrete top CL due to the above is sequentially displayed. When such a graph is displayed, the construction state such as a state in which the graph is horizontal, that is, a state in which there is no fluctuation in height, or a state in which the graph rises at a predetermined gradient, that is, a state in which the graph is pressed at a constant speed, can be grasped very clearly.

In this embodiment, the measuring means is a laser distance meter 8.
However, this may be a laser displacement meter or a laser length measuring device, as long as it is a measuring means using a laser, and the data to be measured is not limited to the distance, and the change in state can be caused by displacement, speed, acceleration, etc. It does not matter if it can be confirmed.

When the processing means is set to be operated in an interactive manner, the measurement work becomes extremely easy and the burden on the operator is reduced. Furthermore, data management can be performed by inputting in advance the initial setting items related to the construction, such as the casting date, the construction location, the pipe diameter, the pipe thickness, the pipe height, the type of concrete to be press-fitted, using the keyboard of the PC 9. In addition to being easier, the steel pipe column 2 can be converted into a current driving height, a driving amount, and the like by the press-fitting operation. further,
By specifying the striking height position, the top CL
Is reached, an alarm output can be generated by a display or a buzzer built in the PC 9.

In addition to not only generating an alarm output at the concrete stop position, but also interlocking with the concrete pump control device, if the stop position is determined, the concrete pump is stopped. It is also possible to set.

In addition, while a preset press-fitting speed is input to the PC 9 and a comparing means for comparing the measured press-fitting speed is provided in the processing means, the concrete pump 3a is provided on the concrete pump side based on the result of the comparing means. By providing a means for feedback control of the pressure of
It is also possible to always perform concrete press-fitting work at the optimum press-fitting speed.

In this embodiment, the laser range finder 8 and the PC 9 are arranged side by side on the top plate 5 for convenience of explanation, but only the laser range finder 8 is set on the top plate 5. When the measurement result is transferred to the PC 10 by connecting it to the PC 9 installed on the ground level with an extension cable or operating the PC 10 within the communicable range by providing the PC 9 with the communication means, the construction manager at the ground level can also The driving situation can be provided in real time, and the construction management can be rationalized. Further, since the operation can be performed at a position apart from the laser distance meter 8, the operation on the top plate 5 becomes unnecessary, and the safety of the operator can be secured.

After the work is completed, the measured data is stored and accumulated in the PC 9, and this data is referred to at the time of later construction, so that the data can be effectively utilized as examination data of the optimum press-fitting speed in the construction. .

[0034]

As described above, in the measuring apparatus and measuring method for the top end of concrete shown in the present invention, a laser is used for the measuring means, so that it is far away due to the excellent directivity of the laser. In addition to being able to easily measure even at a place, extremely high-precision measurement can be performed by utilizing the stability of the frequency peculiar to the laser, and the value can be objectively grasped as a numerical value.

In addition, since the height of the top can be measured without contacting the concrete, which is the object to be measured, only by irradiating the top of the concrete with a laser, accurate press-fitting can be performed without applying an unnatural load to the concrete by the measurement. The speed can be measured, and an excellent effect that the working efficiency is not reduced is exhibited. Furthermore, there is no need to perform an operation that involves the danger that the worker visually observes the inside of the steel pipe column, which is located at a high place, during the press-fitting of the concrete, and the safety of the worker can be ensured.

In addition, while the concrete is being press-fitted, its top height and its press-fitting speed are automatically and successively measured.
Even during the concrete injection, the concrete top height and the injection speed can be sequentially measured and confirmed in real time. That is, even when an abnormality occurs in the concrete press-fitting state, the change can be immediately grasped, so that the concrete press-fitting speed can be adjusted to avoid applying excessive pressure to the steel pipe column, When the press-fitting speed of the concrete to be press-fitted by the weight of the press-fitted concrete decreases, the press-in pressure is increased to increase the press-fitting speed of the concrete, thereby achieving an extremely excellent effect that the construction time can be shortened. .

Further, at the time when the top of the concrete passes through the diaphragm in the steel pipe column, it is possible to expect a dense concrete filling property by temporarily reducing the press-in speed of the concrete.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a construction state of a steel pipe column to which a concrete top measuring device of the present invention is applied.

FIG. 2 is an explanatory diagram showing an overall configuration of a measuring device in an A section of FIG. 1;

FIG. 3 is a diagram showing an example of display contents of a display of the measuring device of the present invention.

[Explanation of symbols]

 2 Steel pipe column 2a Pressure inlet 3 Concrete pump truck 3a Pump 5 Top plate 5a Central opening 6 Measuring device 7 Tripod 8 Laser distance meter 9,10 Personal computer (PC)

Claims (2)

[Claims] 1. A method in which concrete is press-fitted into a standing steel pipe column from its column base, and the height of the concrete top and the press-in speed of the concrete are sequentially measured by a measuring means for automatically measuring using a laser. A measuring device for a concrete top. 2. A method for measuring the top of a concrete, wherein the measurement is performed using the measuring device.