JP2866903B2 - Construction management method of dynamic compaction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a construction management method of a dynamic compaction method for compacting a ground by dropping a hammer suspended by a rope from a predetermined height.

[Prior Art] A construction method using a dynamic compaction apparatus is well known as one of ground improvement construction methods. There are various construction management methods, such as the one disclosed in Japanese Patent Publication No. 63-265013 as an example.

An apparatus used in the conventional dynamic compaction method will be described with reference to FIG.
Provided with a drum rotation detector c, detects the lift of the hammer d from the winding rotation amount and the rotation direction of the winding drum b, and thereby calculates the amount of ground subsidence when the hammer d falls. .

In addition, a hoisting operation pressure switch e and a boom angle detector f for correcting the lift are provided to detect the hammer d.

And the conventional construction management using this dynamic consolidation device is performed by each dynamic consolidation device alone and in a wired manner,
The construction manager of a plurality of dynamic consolidation devices is managed by a construction manager by gathering the construction data of each dynamic consolidation device.

[Problems to be accounted for by the invention]

In the above-mentioned conventional construction management method, real-time simultaneous management of a plurality of dynamic consolidation apparatuses cannot be performed, and a great deal of time is required for construction management. Further, it was not easy to manage uniform ground improvement.

The present invention has been made in view of the above, and has provided a dynamic consolidation system capable of real-time monitoring of the construction status of a plurality of dynamic consolidation devices and simultaneous centralized construction management, so that the state of ground improvement over a large area can be constantly grasped. An object of the present invention is to provide a construction management method of a construction method.

[Means for solving the problem]

In order to achieve the above object, the construction management method according to the present invention is a dynamic consolidation method in which a plurality of dynamic consolidation devices are used to drop respective hammers to consolidate the ground. The construction management data of ground improvement of hammer acceleration, penetration amount, and drop height is transmitted wirelessly at any time,
Each of the construction management data is received and processed by the group management center mounted on the mobile vehicle.

(Operation)

At one group management center, the construction status of the dynamic consolidation device of plural pressures is performed in real time and simultaneous centralized construction management is performed. The group management center moves as needed with the movement of the dynamic compaction device.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

In FIG. 2, reference numeral 1 denotes a general crawler crane, which includes first and second hoisting winches 2, 3.
Reference numeral 4 is a tower having a tripod structure. The tower 4 is suspended and movable by, for example, a first hoisting winch 2 of the crawler crane 1 and is installed vertically near the crawler crane 1. ing. Reference numeral 5 denotes a hammer, which is connected to a chuck 7 supported by a rope mechanism 6. The chuck 7 is engaged and disengaged by hydraulic pressure. One end of the rope of the rope mechanism 6 supporting the chuck 7 is connected to the upper part of the tower 4, and the other end is connected to the second hoisting winch 3 of the crawler crane 1. The chuck 7 is raised by winding the rope. According to this configuration, most of the load acting on the chuck 7 is supported by the tower 4.
The upper end of the tower 4 is provided with a limit switch 8 for detecting the upper limit of the chuck 7.

In the support frame 5a of the hammer 5, an acceleration sensor 9 for detecting the impact acceleration of the hammer 5, an arming sensor 10 for detecting the ground breaking of the hammer 5, and a detection value of the acceleration sensor 9 are stored and transmitted wirelessly. Acceleration transmission unit
11 and a transmission antenna 12 are attached.

On the other hand, a group management center 13 that receives data wirelessly transmitted from the acceleration transmission unit 11 via the transmission antenna 12 and performs predetermined processing is mounted on a mobile vehicle at an appropriate place away from the crawler crane 1 and installed on a mobile vehicle. Have been.

The acceleration transmission unit 11 is configured as shown in FIG. 3, 14 is a CPU, 15 is an A / D converter, and 16 is a memory (RAM).
It is. The detection signal of the acceleration sensor 9 is a preamplifier.
17, input to the CPU 14 via the buffer amplifier 18. Reference numeral 19 denotes a trigger signal circuit. The trigger signal circuit 19 includes a comparator 20 and a threshold 21, and serves as a comparison circuit for determining whether the acceleration signal has reached a certain level or higher.

The signal of the arming sensor 10 is sent to the CPU 1 through an arming signal circuit 24 including a preamplifier 22 and a comparator 23.
4 is to be entered.

25 is a digital modulator and 26 is a transmitter.

The group management center 13 includes, as shown in FIG.
It consists of a personal computer 28, a CPT 29, and a hard disk 30.

 The operation of the above configuration will be described below.

The impact acceleration when the hammer 5 falls and touches the ground is detected by the acceleration sensor 9, and the detected small signal is input to the acceleration transmission unit 11, and the
17. The signal is amplified by the buffer amplifier 18, converted into a digital signal by the A / D converter 15, and stored in the memory 16.

When the storing is completed, the power of the detection signal system connected to the acceleration sensor 9 is turned off, the power of the transmission signal system connected to the transmitting antenna 12 rises (ON), and the acceleration signal stored in the memory 16 is restored. The signal is digitally modulated by the digital modulator 24 and transmitted from the transmitter 25 by the antenna 12. All of this control is performed by the CPU 14.

Here, as shown in FIG. 1, a plurality of dynamic compaction apparatuses A are working at random, and the acceleration signal is transmitted from each acceleration transmission unit 11.

The acceleration signal transmitted from the acceleration transmission unit 11 of each device is received by the receiving device 27 of the group management center 13, processed by the personal computer 28, and the result is displayed on the CRT 29 and stored in the hard disk 30.

As described above, instead of transmitting the signal from the acceleration sensor 9 attached to the hammer 5 in real time, the signal is once taken into the memory 16 and the radio wave environment is stabilized (the hammer 5 is grounded and stopped). Since the signal is transmitted after the signal has been transmitted, there is little signal loss. Further, since the control of the acceleration transmission unit 11 is performed by the arming signal, automatic measurement is possible.

In order to automatically capture the acceleration signal, there are two types of signals: presence or absence of a signal input, and a preparation signal for receiving the signal. The former is called a trigger signal, and the latter is called an arming signal.

 The trigger signal is generated by the trigger signal circuit 19.

The arming signal is like a safety device that holds down the trigger of the gun.
The sequence does not take in data by D conversion.

The arming signal in this embodiment is obtained by changing the two strain gauges 10a and 10b attached to the column of the hammer 5.

The arming signal is generated by pulling up the hammer 5, and when the level does not reach a sufficient level and a predetermined time Δt, the CPU 14 determines the validity of the signal and assures arming.

FIG. 5 shows the determination of the arming and the data acquisition by the trigger signal. When the hammer 5 is grounded and the output of the comparator 23 of the arming signal circuit 24 rises, the arming is determined after a lapse of a predetermined time Δt. When arming is confirmed, the CPU 14 turns on the power to the acceleration sensor up system
Then, the over-transformer of the acceleration sensor is prepared, a signal input is waited, and a standby state is entered after 0.5 seconds. After that, the A / D converter 15 fetches data from time to time,
Continue to store in 6.

Acceleration data will become negative when the hammer 5 starts to fall, it rises instantaneously from the moment the ground t _1. At this time, a trigger signal is generated and this value is
When the level exceeds 21 levels, the captured data at this time is loaded into the memory 16, and after this loading is completed, the power supply of the amplifier system is turned off, the power supply of the transmission system is turned on, and the transmission frequency is set. Send the data in 16.
Then, after the transmission is completed, the power of the transmission system is turned off. The above operation is repeated until the dynamic consolidation ends.

In the group management center 13, the transmission content from each of the acceleration transmission units 11 is received, and a predetermined process is performed in the data processing unit connected thereto.

At this time, in addition to the acceleration when the hammer 5 touches the ground, the penetration amount can be known from the waveform detected by the acceleration sensor 9.

That may be determined by the in Figure 5, treatment with group management center 13 the time from the drop beginning t ₁ to the rising point t ₂ of the ground acceleration.

FIG. 6 shows data for each hitting point received by the group management center 13. In the drawing, a indicates acceleration, and b indicates the amount of penetration (total). S ₁ , S _2, ... Indicate one dynamic consolidation path.

Each of the dynamic consolidation devices A, A,..., Which are working at random, moves to the next point when the expected number of impacts ends or the target ground is improved. then,
The group management center 13 grasps the construction state of each dynamic compaction apparatus A, displays the construction situation every moment to the operator of each dynamic compaction apparatus A, and transmits the next work message and the like to the operator seat by radio. It gives instructions to the installed operation units to control and manage the construction status. The daily construction management is printed out, and all the construction management data of the improved ground is stored on the hard disk.

In the above-described embodiment, an example is described in which the penetration amount is obtained from the group management center 13 from the waveform of the acceleration signal. However, this may be another method.

That is, in FIG. 2, a rotary encoder 31 is provided at the top of the tower 4 for detecting, based on the moving length of the rope, a rising distance from a position at which the hammer 5 breaks down to a position where the hammer 5 contacts the limit switch 8. The detection signal from 31 is input to the running unit 32 mounted on the body. Since this rising distance changes gradually with the change in the amount of penetration, the amount of penetration is calculated by taking a difference for each stroke.

The running unit 32 detects the input detection value as the tower 4
Is transmitted to the group management center 13 from the second transmission antenna 33 provided at the top of the group.

In this case, both the signal from the second transmitting antenna 33 and the signal from the acceleration transmitting unit 11 of the hammer 5 are input to the group control center 13, and both signals are processed by the personal computer 28.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, the construction status of a plurality of dynamic compaction apparatuses can be managed in real time and simultaneously centralized construction management, and the ground improvement state over a large area can be always grasped.

And, in particular, according to the present invention, the group management center mounted on the mobile vehicle transmits the construction management data from each of the dynamic consolidation devices, so that a plurality of units changing according to the progress of the work are provided. The group management center can be sequentially moved to an optimum position in accordance with the arrangement of the dynamic compaction device, and the construction status of each point of the dynamic compaction device that moves according to the progress of the work can be accurately managed.

[Brief description of the drawings]

Drawings show an embodiment of the present invention, FIG. 1 is an overall explanatory view showing a construction management system, FIG. 2 is a structural explanatory view schematically showing an apparatus for performing a dynamic compaction method, FIG. Is a block diagram showing detection means provided on the hammer side, FIG. 4 is a block diagram showing a group management center provided on the ground side, FIG. 5 is a time chart showing a detection state of detection data, and FIG. 6 is a construction management waveform. FIG. FIG. 7 is a configuration explanatory view of a dynamic compaction device used in a conventional construction management system. 1 is a crawler crane, 2 and 3 are hoisting winches, 4 is a tower, 5 is a hammer, 6 is a rope mechanism, 7 is a chuck, 9
Is an acceleration sensor, 10 is an arming sensor, 11 is an acceleration transmission unit, 12 is a transmission antenna, 13 is a group management center, 14
Is a CPU, 16 is a memory, 24 is an arming signal circuit, 25 is a receiving device, 26 is a personal computer, 27 is a CRT, and 28 is a hard disk.

Continuing on the front page (72) Inventor Koji Ninomiya 4-9-9 Akasaka, Minato-ku, Tokyo Inside Soil Development Co., Ltd. (72) Inventor Atsushi Watanabe 4-9-9 Akasaka, Minato-ku, Tokyo Sat, Japan Inside the Development Co., Ltd. (72) Inventor Masayuki Aizawa 4-9-1-9 Akasaka, Minato-ku, Tokyo Japan Soil Development Co., Ltd. (56) References JP-A-58-106021 (JP, A) JP-A-63- 265013 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 3/046

Claims (1)

(57) [Claims] A dynamic consolidation method in which a plurality of dynamic compaction devices drop respective hammers to consolidate the ground, wherein the ground of the acceleration, penetration amount, and drop height of the hammer from each dynamic compaction device. The construction management of the dynamic consolidation method characterized in that the construction management data of the improvement is transmitted by radio at any time, and each of the construction management data is received and processed by the group management center mounted on the mobile vehicle. Method.