JPH0320341Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tremie pipe construction management device, and more particularly to a management device that measures the position of the tremie pipe tip using ultrasonic waves.

Traditionally, when constructing concrete structures such as underground walls and bridge legs, there have been methods of pouring concrete into water, the sea, or muddy water. There is a tremie method in which concrete is placed using a .

In this construction method, an important condition for obtaining a high-quality structure is that the concrete be washed by water and constructed without separation of constituent materials such as cement and aggregate.

Incidentally, in recent years, underwater concrete has been developed and put into practical use by adding a special polymer compound to concrete to increase the viscosity of the concrete, so that even when washed with water, there is little separation of constituent substances.

When placing this type of underwater concrete using the tremie method, the tip of the tremie tube must be kept away from the surface of the concrete that has already been placed to ensure smooth discharge due to the high viscosity of the concrete. On the other hand, although separation of underwater concrete is suppressed, separation will occur if the concrete is separated too far from the concrete surface.

Therefore, it is desirable that concrete be placed while maintaining a predetermined positional relationship between the tip of the tremie pipe and the surface of the concrete to be placed.

Here, it is important to measure the position of the tremie pipe and the poured concrete surface, but with conventionally provided devices, there was a problem especially when the tremie pipe was placed at a distance from the concrete surface.

That is, as a measurement means, for example,
As shown in Japanese Patent No. 7705, there is a method for measuring the temperature difference between concrete and water, but this method cannot be used at all when the tremie pipe is placed at a distance from the concrete surface.

Additionally, the applicant has already developed and filed an application for a device that uses ultrasonic waves for measurement, but this device also has an ultrasonic sensor attached to the side of the tremie tube, and the flange that connects the tremie tube. Ultrasonic waves are projected onto the area and may be reflected diffusely, which may reduce measurement accuracy.

Furthermore, since the drive source of the ultrasonic sensor is also attached to the side of the tremie tube, the inside must be made watertight, which sometimes complicates the installation.

This idea was devised in view of the problems mentioned above, and its purpose is to achieve a predetermined positional relationship between the tip of the tremie pipe and the poured concrete surface with high precision and complexity. The purpose of the present invention is to provide a tremie pipe construction management device that can be maintained without any problems.

Hereinafter, preferred embodiments of this invention will be described with reference to the accompanying drawings.

1 to 3 show an embodiment of the tremie pipe construction management device according to this invention.

FIG. 1 shows the entire management device, which includes a plurality of hollow cylindrical tubes 10 with flange portions 10
A plurality of ultrasonic sensors 14, which are interconnected at a to form a tremie tube 12 of a required length, project ultrasonic waves downward to the distal end of the tremie tube 12, and receive the reflected waves; 14 is placed in a recess 16 formed to face the axis of the tremie tube 12, with the vibration surfaces of the sensors 14, 14 aligned with the distal end surface of the tremie tube 12, and an adhesive 18
is filled and fixed.

The ultrasonic sensors 14, 14 are electrically connected to a measuring device 22 installed on the water surface via lead wires 20, respectively, and the lead wires 20 are connected to a through hole in the flange portion 10a of the tube body 10. The inside of the tube is inserted through the tube.

The measuring device 22 includes the ultrasonic sensors 14, 14.
The positional relationship between the tip of the tremie pipe 12 and the concrete surface 13 is measured by driving the ultrasonic sensors 14 to oscillate and measuring the time difference between the projection and reflection of these ultrasonic sensors 14, 14.

This measured value is then sent to the control device 24 and processed, and the distance () between the tip of the tremie pipe 12 and the concrete surface 13 is calculated, and this distance () is combined with a preset finite range value (tremie The lower limit of the positional relationship between the tip of the pipe 12 and the poured concrete surface 13 is set to a value (min) at which the concrete can easily flow down, and even if dropped into water, separation of the poured concrete will not cause defects in the concrete structure. The upper limit is the value (max) that cannot be exceeded, and the value varies depending on the amount of separation-reducing polymer agent added to the concrete, but for example, it is a value between 0 cm and 50 cm. ), the calculated value () is compared to this finite range value (
The control device 24 operates to raise the tremie tube 12 to the upper limit (max) of the finite range when the value becomes substantially the same as the lower limit (min) of the finite range.

More specific details of the measuring device 22 and the control device 24 will be explained based on FIG. 3.

The ultrasonic sensors 14, 14 are connected to a pulse generator 22a and a receiver 22b via changeover switches S ₁ and S ₂ of a control device 22, respectively, and the pulse generator 22a is connected to a pulse generator 22a based on a signal from a synchronous controller 22c. Each ultrasonic sensor 14, 14 is driven to oscillate.

The reflected signals received by the ultrasonic sensors 14, 14 are taken into the receiver 22d, and are input as they are to the display/recorder 22b as an analog signal, as well as to the counter 22e that measures the time difference from projection to reflection. be done.

The time difference measured by the counter 22e is
The data is taken into the control device 24 and subjected to arithmetic processing.

First, the distance () between the ultrasonic sensors 14, 14 and the concrete surface 13 is calculated from the oscillation frequency and the time difference, and
The average value () of 4,14 is calculated, and a comparison is performed between this value () and a preset finite range value (min to max), and the average value () is substantially equal to the lower limit (min) of the finite range value. If it is determined that the values are the same,
A signal is sent to a drive motor 28 connected to a hoisting drum 26 of a winch, crane, etc. that pulls the tremie tube 12 upwards, and the tremie tube 12 is pulled up to the upper limit (max) of the finite range value, and the ultrasonic sensor 14 is activated again. , 14 are oscillated and the above-described operation is repeated to confirm whether or not the position of the tremie tube 12 is appropriate.

Such an operating procedure is performed in the ROM of the control device 24.
24a, the measured values or finite range values of the measuring device 22 are stored in the RAM 24b, and the CPU 24c executes arithmetic processing, and the results are sent to the drive motor 28 via the data output unit 24d. Ru.

Note that the reference numeral 30 in FIG. 3 is a power supply circuit for the measuring device 22 and the control device 24.

As described above in the embodiments, in the tremie pipe construction management device according to this invention, concrete is poured while maintaining the positional relationship between the tip of the tremie pipe 12 and the concrete surface 13 in an almost ideal manner. Because concrete is poured into concrete, extremely high-quality underwater concrete structures can be obtained.

In addition, since the tip position of the tremie tube 12 is measured by the ultrasonic sensor 14 attached to the tip closest to the concrete placement surface, the tube body 1
Since there is no influence of reflection from the flange portion 10a of the sensor 0, highly accurate measurement values can be obtained, and the tip position can be calculated using the average value of the plurality of sensors 14, 14, the measurement accuracy is greatly improved.

Furthermore, since the only device that is put into the water is the ultrasonic sensor 14, a watertight structure is not required and the system can be simplified.

Furthermore, since the lifting work of the tremie pipes 12, which is necessary for pouring concrete, is automatically performed, workability and economical efficiency can be improved, and, for example, multiple tremie pipes 2 can be installed in a wide area. Even when pouring concrete at the same time, expanding the storage capacity of the control device 24 makes it possible to control these tremie pipes 12 simultaneously, dramatically improving work efficiency and economy.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an embodiment of tremie pipe construction management according to this invention, FIG. 2 is an enlarged sectional view of the main part, and FIG. 3 is a block diagram of the management device. 10... Pipe body, 10a... Flange portion, 12...
...Tremy tube, 14...Ultrasonic sensor, 16...
... recess, 18 ... adhesive, 20 ... lead wire, 2
2... Measuring device, 24... Control device, 26... Hoisting drum, 28... Drive motor.

Claims (1)

[Scope of utility model registration request] A management device for a tremie tube that is formed into a hollow cylindrical shape and is used to pour concrete at a predetermined distance from the concrete surface, and is attached to the lower surface of the tip of the tremie tube and projects ultrasonic waves downward. a plurality of ultrasonic sensors that receive the reflected waves; a device that drives the ultrasonic sensors to oscillate and measures a time difference between projection of the ultrasonic sensors and reception of the reflected waves; A control device that calculates the position of the lower surface of the tip, compares the calculated value with a preset finite range value, and sends out an output signal when the calculated value becomes substantially the same as the lower limit of the finite range value. , a hoisting device that receives the output signal and raises the tremie pipe to the upper limit of the finite range value.