JPS60109499A - Concrete solidifying apparatus - 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 The present invention relates to a compaction device for cast-in-place concrete for constructing shield tunnels.

Conventionally, the shield tunnel construction method used was a complicated method consisting of three steps: primary lining, backfill injection, and secondary lining, but as we approached the ridge, we improved the drawbacks of the above method. However, the method of lining tunnels using cast-in-place concrete casting in a single concrete casting process has been adopted. In cast-in-place concrete, a large amount of concrete is injected at once, so compaction of the lining concrete during tunnel construction is an important factor in maintaining the strength and quality of the concrete.

Conventionally, most of the compaction of concrete lining in tunnels has been carried out using vibrators attached to the formwork, and empirical values have been adopted for the compaction time. . Therefore, it has disadvantages such as (1) compaction is concentrated only near the surface of the formwork, and (2) it is difficult to quantitatively determine whether or not compaction has been sufficiently achieved.

The object of the present invention is to provide a concrete compaction device that can improve the above-mentioned conventional drawbacks and perform efficient compaction, and its configuration uses electric power to suppress compaction vibrations. vibrator to generate
The compaction device consists of an oscillator and thrust rod, and a vibrator jack that inserts and extracts the vibrator.Insertion and extraction are controlled by a detector that detects the input current of the vibrator, a power unit, and a solenoid valve. It has a vibrator jack and a calculation mechanism that calculates the operating time of the vibrator based on the signal from the above-mentioned detector, and also calculates the timing of inserting and removing the vibrator, and operates the vibrator jack. This is a concrete compaction device constructed as shown in FIG. The skin plate of the machine, 2 is the formwork for the tunnel lining, 3 is the concrete lining part where pouring has already been completed, and 4 is the uncompacted part where concrete has just been poured. The formwork 5 prevents concrete from flowing into the tunnel. Fig. 2 is a front partial view of this multi-gable formwork 5.The front part of the multi-gable formwork 5 is provided with a closing plate at an appropriate interval around its circumference in order to insert a vibrator for compacting the poured concrete. 6 is installed.

The closing plate 6 is made of a material with a certain degree of strength and elasticity, such as hard rubber, and has a notch 7 in its center as shown in FIG. Although it has sufficient strength to prevent leakage,
A rigid push rod such as a pie break can be easily inserted. The vibrator's thrusting god 8 is this blocking plate 6
It is inserted into the uncompacted part 4 of the concrete through the cut 7 of the elastic part. The vibrator is composed of a thrust rod 8, an electric oscillator 9, and a vibrator jack 1o whose propulsion and extraction are controlled by hydraulic or pneumatic pressure.

Reference numeral 11 denotes a power supply, and power is supplied to a power unit 14 for the vibrator jack 10 via a detector 12, an oscillator 9, and a calculation mechanism 13. The detector 12 detects the current value of the power sent to the oscillator 9 and sends this current signal to the calculation mechanism 13. The calculation mechanism 13 operates the solenoid valve 15 based on the above-mentioned current signal, and the vibrator jack 10
The oscillator 9 controls the propulsion and extraction of the
It has a mechanism to calculate the compaction time from the load current value.

When operating the apparatus configured as described above, the vibrator thrust rod 8 is first propelled by the vibrator jack 10 and inserted into the uncompacted part 4 of the poured concrete through the closing plate 6. The oscillator 9 transmits the vibration to the thrust rod 8, and compaction is started. In this case, the load current of the oscillator 9 is small in the process where the ramming rod 8 is not fully inserted into the concrete or when the concrete is insufficiently compacted; As the compaction progresses, the load current of the oscillator 9 increases. Therefore, by detecting the current value sent to the oscillator 9 by the detector 12, the degree of compaction can be detected. Furthermore, regarding the amount of concrete compacted by this single ramming rod 8, if this amount is large, compaction will take time, and if this amount is small, compaction will be completed quickly, and this tendency can be detected. The compaction time can be calculated even during compaction by detecting the rate of increase in the current value detected by the device 12 over time. When the current value of the oscillator 9 reaches the optimum compaction value determined from the insertion degree of the ramming rod 8 and the compaction degree, the work is completed and the vibrator jack 10 is activated, Tsukigami 8 is pulled out, and compaction work 1 is started.
- The cycle is complete.

The concrete compaction device according to the present invention has the above-described configuration and function, and therefore quantitatively grasps the compaction of concrete, which was previously difficult to grasp and relied largely on empirical intuition. Compaction can be performed reliably by checking the current value, and unnecessary compaction is not performed.
Since it reaches the inside of the concrete, it is possible to reliably compact not only the surface but also the inside, reducing work time and producing high-quality concrete lining.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view and control block diagram showing the configuration and operation of the device of the present invention, Fig. 2 is a partial front view of the gable form shown in Fig. 1, and Fig. 3 is an enlarged front view of the closing plate. . 8... Thrust rod 9... Oscillator 10... Jacket 11... Power supply 12... Detector 13... Calculation mechanism 14... Power unit 15... Solenoid valve applicant: Company, Ltd. Tsuzuriyo Rihito Patent Attorney Yuji Taka Department Figure 1

Claims (1)

[Claims] (1) A detector that detects the input current of the vibrator,
A power unit and a solenoid valve that control the insertion and withdrawal of the vibrator jack, and a calculation mechanism that controls the vibrator and pipe release jack based on the signals from the above-mentioned detector. A concrete compaction device configured to calculate the operating time of a vibrator by a calculation mechanism and to control insertion and withdrawal by a vibrator jack.