JPS62264259A - Method of tamping placed concrete by vibrator for formwork - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to the field of concrete pouring work in architecture, particularly to the rising parts of columns, walls, etc., by concrete pouring using formwork. This invention relates to a method for appropriately compacting poured concrete inside a formwork using a formwork vibrator during construction.

[Prior art] In concrete pouring work, properly compacting the poured concrete is an important task that affects quality.

By the way, compaction of poured concrete in the rising parts of pillars, walls, etc. is usually done by inserting a bar-shaped vibrator from the upper end of the formwork, but there are many obstacles such as reinforcing bars in the narrow formwork. Since the scaffolding for work is not in good condition, it is difficult to perform sufficient compaction.

So, I hit the formwork from the outside with a mallet! A formwork vibrator is installed on the outside of the two frames to shake the formwork considerably to ensure sufficient compaction of the poured concrete.

Problems to be Solved by the Invention Conventionally, when using the above-mentioned formwork vibrator,
A worker checks whether concrete has been placed inside the formwork by hitting the formwork with a mallet, etc., and after confirming that concrete has been placed, starts the formwork vibrator. Compaction has started.

Therefore, the timing and operating time of the formwork vibrator is entirely up to the operator, making it difficult to perform comprehensive control and making it difficult to confirm quality.

In addition, the concrete flowed due to the action of the bar vibrator and the formwork vibrator, causing the top of the concrete to drop below the initially confirmed level, and the vibrator was often left running even though there was no concrete.

For this reason, the formwork may be damaged by the vibrator,
Or, the variation in compaction becomes large and it becomes difficult.
Defects such as cold joints and insufficient joints 1 Defects 1 Problems such as variations in quality occurred.

Means for Solving the Problems As a means for solving the above-mentioned problems, a method for compacting poured concrete using a vibrator for formwork according to the present invention is illustrated in FIGS. 1 to 3 of one drawing. As shown, first place the formwork pie break 2 on the outside of the formwork l. ! !
Attach section 3 and detection section 4 respectively. Then, the formwork 1 is continuously lightly tapped with the striking part 3, and the detection part 4 detects the hitting sound or the vibration state of the formwork. In this way, when the impact sound or vibration state changes as the concrete goes around inside the formwork l, and this is detected by the detection unit 4, the formwork vibrator 2 is started based on the detection signal, and the vibrator 2 is activated for the set time. Automatically stops after activation. Thereafter, the step of repeatedly striking the formwork 1 with the striking section 3 and detecting it with the detecting section 4 was performed.

During the work of placing working concrete 6, the formwork l is
In particular, the weir plate 1a is lightly tapped from the outside. Then, when the top of the concrete 6 placed inside the formwork reaches the striking number of the striking part 3, the striking sound or vibration state (amplitude size or frequency peak position) of the weir plate 1a suddenly changes. do. The detection unit 4 continuously detects the presence or absence of this change, and the detection signal is input to the control device 5. control gi stirrup 5
In this case, a model signal of the impact sound or vibration state (peak position, amplitude, etc. determined by frequency analysis) when the concrete top reaches the pouring position is set in advance, and this setting is applied. Comparing the signal and the detection signal, confirming the existence of the poured concrete 6 based on the coincidence or approximation,
Turn on the formwork vibrator 2. At the same time, the striking section 3 stops.

The formwork vibrator 2 is started upon receiving the above-mentioned ON signal, operates for a preset time, for example, several minutes, compacts the concrete 6, and then automatically stops.

Thereafter, the striking section 3 is started again to perform concrete confirmation work by striking the weir plate 1a. If the presence of the poured concrete 6 cannot be confirmed in this (1) confirmation work, the impact is continued until the presence is confirmed, and when the concrete 6 is confirmed again, the formwork vibrator 2 is activated as described above. Repeat the series of steps to turn it on.

On the other hand, if the existence of the poured concrete 6 is immediately confirmed during the reconfirmation work by the striking section 3, it is determined that the compaction of the concrete has been completed after all, so the striking section 3 automatically restarts after a certain period of time. make it stop. Then, the formwork vibrator 2, striking section 3, and detection section 4 are moved to a further upper position for use.

In this way, the concrete 6 is compacted by the formwork vibrator 2 for a preset period of time, so there is almost no variation in quality.

Example Next, a preferred embodiment of the invention will be described.

First, Fig. 1 shows a formwork 1 consisting of a weir plate 1a and a steel pipe framework 1b that fixes and holds this from the outside, a formwork vibrator 2 attached to this formwork 1, and a detection section. 4. A striking part with built-in 3. and the control device 5. .

The formwork vibrators 2... are arranged in the same group on a substantially horizontal line at a substantially constant height position, and are attached to the steel pipe 1b.

On the other hand, the striking part 3 with a built-in detection part 4 is installed in a horizontal line at a position several tens of centimeters above the vibrator 2 for formwork, and directly nailed to the outside of the weir plate 1a. It is attached temporarily by hammering or other methods. By the way, what about the batting department 3?

It is light and small, and has a configuration in which a small motor of about 20 W rotates the striker once at a constant speed to lightly tap the weir plate 1a.

As mentioned above, the reason why the striking part 3 and the detection part 4 are installed at a higher position than the formwork vibrator 2 is that the top of the poured concrete confirmed by the detection part 4 is the source of vibration of the formwork vibrator 2. This is because it must not be lower than the actual position.

-' The control device 5 normally has a switching function for several channels, and is fixedly attached to the steel pipe ib, and is connected to several groups of formwork vibrators 2. Hitting part 3
, the detection section 4 are connected as shown in the wiring diagram shown in FIG.

When all the above preparations are completed and concrete 6 is poured inside the weir 1a, the striking part 3 is started in advance,
Wait for the top of the poured concrete 6 to rise.

If there is no concrete inside weir 1a, hit 1! &
The vibration state of the weir plate 1a that has been lightly tapped by the detector 3 is detected by the detection unit (
Vibration sensor) 4 monitors the waveform as shown in the left half of Fig. 3A, and when this is analyzed in frequency, it is monitored as a waveform with two peak positions as shown in Fig. 3B.

However, when the top of the concrete 6 rises inside the weir 1a and reaches the height at which the striking part 3 is attached, the vibration state of the weir plate 1a struck by the striking part 3 changes to the right side of Fig. 3A. A waveform that shows a sudden change in the waveform that appears about halfway down the line, that is, a waveform whose amplitude has become smaller than h, is monitored, and when this is analyzed in frequency, the peak position shifts to the left and appears as one peak, as shown in Figure 3C. Sudden changes in the waveform are monitored.

Therefore, the control device 215 confirms that the top of the poured concrete 6 has risen due to the sudden change in the vibration state, and based on this, the formwork vibrator 2 is turned on. At the same time, the operation of the striking section 3 is stopped. .

Since the formwork vibrator is attached to the steel pipe framework 1b, its attachment compacts the construction house 6' that has reached the position over the entire 441'. However, this formwork isolator 2 is operated for 1 to 3 minutes per time set on a timer, etc., and then stopped. When the vibrator 2 is automatically stopped, the striking part 3 is turned on again at the same time to reconfirm whether concrete 6 is present inside the formwork l.

If it is determined through this reconfirmation that the concrete 6 does exist through the detection of the vibration state described above, it is assumed that the compaction of the poured concrete 6 at that level has been completed by the activation of the formwork vibrator 2. Therefore, the striking section 3 is automatically stopped after a certain period of time, and the surroundings are notified of this by means of a buzzer or lighting.

Therefore, as soon as the buzzer sounds, the corresponding group of formwork vibrator 2, striking section 3, and detection section 4 can be removed, and the compaction ratio above can be changed for use. Therefore, the quality of the compacted concrete 6 can be maintained almost constant.

In addition, the formwork vibrators 2. are installed in the formwork l, divided into heights of approximately 100C. Impact part 3, detection part 4
A group (or set) of these are installed in advance and are automatically operated in sequence by the control device 5 as the top of the poured concrete 6 rises.

By the way, if the presence of the poured concrete 6 is not confirmed by the reconfirmation blow by the striking section 3, the concrete 6 may have flowed due to the previous compaction and its top end may be lower than the installation position of the striking section 3. be understood as a thing. Therefore, the striking part 3 continues to operate and waits for the top of the poured concrete 6 to rise, and after the top of the concrete 6 rises again and the detection part 4 detects the concrete 6, the above-mentioned process is performed. The concrete compaction process will be repeated.

In addition, when detecting the presence or absence of concrete 6 by the sound generated by hitting it with the striking part 3, it is carried out by using the sensor of the detecting part 4 as a sound sensor and modifying the system of control*ffl 5 accordingly. .

As described in detail in conjunction with the embodiments, the effects of the invention are as follows, and according to the method for compacting poured concrete using a vibrator for formwork according to the present invention, compaction of concrete for formwork is performed according to a predetermined automatic control program. The vibrator 2 is automatically operated at the perfect time and for the required time to place concrete 6.
Compaction is carried out.

Therefore, the first priority is for workers to visually check and other things! i! There is no need for the party to manage the system at all, which saves labor.

This management can be incorporated into the overall construction management, making it highly reliable and preventing variations in concrete quality.

In addition, the poured concrete 6 may flow and the formwork pie break 2 spins idle, causing the formwork 1 to break, or the formwork vibrator 2 may cause slag to occur due to excessive application of the formwork vibrator 2. The occurrence of defects can be prevented.

Furthermore, the concrete can be replaced immediately upon receiving a signal from a buzzer or the like that the compaction work is complete, allowing the concrete pouring work to proceed smoothly and with high quality.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the external appearance of a formwork in which the method of the present invention is carried out, Fig. 2 is a wiring diagram of each element, and Fig. 3 A, B, C.
2 is a waveform diagram of the detected vibration state of the formwork. Applicant Takenaka Corporation', f, -t 7+ Representative patent attorney Masahiko Yamana; Figure 1 (vibrator) Engraving of drawings (no changes to content) Figure 3 Procedures 1n Seishogo Side June 4, 1986

Claims (1)

[Claims] [1] Attach a formwork vibrator (2), a striking part (3), and a detection part (4) to the outside of the formwork (1), respectively,
The striking part (3) continuously taps the formwork (1), and the detection part (4) detects the hitting sound or vibration state of the formwork, and the hitting sound or vibration state is detected inside the formwork (1). When the concrete goes around and changes, and this is detected by the detection part (4), the formwork vibrator (2) is started based on the detection signal, and after the set time has been activated, it is automatically stopped, and the striking part (3) is activated again.
) A method for compacting poured concrete using a formwork vibrator, characterized by repeatedly performing pounding of the formwork (1) by a sensor (1) and detection by a detection unit (4).