JP2020190148A - Safety system for construction machine - Google Patents

Abstract

To provide a safety system for a construction machine, capable of securing safety of a worker working around the construction machine by generating an alarm at optimum time depending on the construction machine's motion state.SOLUTION: A safety system for a construction machine is configured so as to include a communication apparatus 29 mounted on a pile driver 11 and a worker terminal that is held by a worker 54 and receives an alarm signal from the communication apparatus to generate an alarm recognizable by the worker. The pile driver comprises a controller for causing a first alarm mode and a second alarm mode having execution timing differing from that of the first alarm mode to be executed selectively, the first alarm mode being a control method for originating an alarm signal when the worker terminal is located within a set range around the construction machine, the second alarm mode being a control method for originating an alarm signal when the worker terminal is located within the set range and any driving operation of driving operations individually corresponding to a plurality of motions is performed. The safety system for the construction machine is configured to be capable of setting the first alarm mode and the second alarm mode by receiving an operation detection signal of a changeover switch provided in a driving cab.SELECTED DRAWING: Figure 5

Description

The present invention relates to a construction machine safety system that communicates with a worker working around the construction machine and gives an alarm based on the communication.

At construction sites where construction machines such as excavators, cranes, and pile drivers are used, it is common for a large number of workers to work around the construction machines, causing contact accidents between the construction machines and the workers. Prevention has become an important issue. Therefore, the work is performed by determining whether or not the worker who has entered the work area set around the construction machine is a collaborator who acts with the construction machine, and if it is not a collaborator, an alarm is generated. An alarm system has been proposed that prevents unnecessary alarms and prevents a decrease in work efficiency while ensuring safety (see, for example, Patent Document 1).

JP-A-2009-193494

As mentioned above, when the construction machine and the worker work in parallel at the same work place, the worker is working around the construction machine by his / her own will while recognizing the existence of the construction machine. Therefore, in such a case, if an alarm is frequently given to the worker, the worker may rather feel the alarm annoying. And if the worker feels the alarm annoying, he / she becomes insensitive to the alarm, so there is a safety device for construction machinery that "warns the worker to prevent contact accidents with construction machinery". There is a risk that the original purpose of the work cannot be effectively achieved. In particular, large pile drivers such as three-point pile drivers tend to have blind spots around them due to their unique shape, and in addition, rods buried in the ground when performing pile driving work. It is also necessary to allow the worker to enter the vicinity directly under the auger because the work of adding steel pipe piles and steel pipe piles is performed. For this reason, the operator may be in a dangerous situation due to lack of attention of the operator or the operator of the pile driver.

Therefore, an object of the present invention is to provide a construction machine safety system capable of generating an alarm at an optimum time according to the operating state of the construction machine and ensuring the safety of workers working around the construction machine. ..

In order to achieve the above object, the construction machine safety system of the present invention communicates between the construction machine and the workers engaged in the work around the construction machine, and gives an alarm based on the communication. In a machine safety system, a communication device mounted on the construction machine, a worker terminal carried by the worker and receiving an alarm signal from the communication device to generate an alarm recognizable by the worker. The construction machine is provided with a control device that controls the operation of the construction machine by operating the operation device provided in the driver's cab on which the driver is boarding, and the control device is provided by the worker terminal. The first alarm mode that transmits the alarm signal when it is located within the set range around the construction machine and the operation operation corresponding to the operation while the worker terminal is located within the set range are performed. A second alarm mode that transmits the alarm signal when the vehicle is damaged is selectively executed, and the first alarm mode and the second alarm mode can be set by a changeover switch provided in the driver's cab. It is characterized by being done.

Further, the construction machine includes a base machine including a lower traveling body provided with a crawler and an upper rotating body provided so as to be able to turn above the lower traveling body, and a vertical movement provided at the front portion of the upper rotating body. The set range includes a travel range of the lower traveling body, a turning range of the upper swing body, and a danger range corresponding to the movable range of the working device around the construction machine. The operation is divided into a plurality of setting ranges for each part including ..

Further, the construction machine is a pile driver for creating piles in the ground, and the worker is a person engaged in pile replenishment work around the pile driver.

According to the safety system of the construction machine of the present invention, the first alarm mode that generates an alarm on the condition that the worker terminal is located within the set range around the construction machine, and in addition to this condition, the operation operation is performed. Since the control is performed to selectively execute the second alarm mode that generates an alarm when it is performed, for example, if the first alarm mode is set at the stage where the construction machine moves toward the work position, the construction machine moves. Even if there is a worker in the vicinity who is trying to get out or is not aware of the approach after starting to move, the worker can be alerted by an alarm. On the other hand, if the second alarm mode is set at the work stage after the construction machine has moved to the work position, the worker can work around the construction machine by his / her own will while recognizing the existence of the construction machine that is stopped. It is possible to prevent giving unnecessary warnings to workers. That is, it is possible to generate an alarm at the optimum time according to the operating state of the construction machine and ensure the safety of the workers working around the construction machine. In particular, at the site where a pile driver is used, a worker engaged in pile replenishment work can react sensitively to an alarm, and the work can proceed while ensuring sufficient safety.

It is a side view of the pile driver to which the safety system which shows one embodiment of this invention is applied. Similarly, it is explanatory drawing which shows the detection state of the worker who is located in the setting range of the pile driver in the 1st alarm mode. Similarly, it is explanatory drawing which shows the state which divided the setting range by part. Similarly, it is explanatory drawing which shows the detection state of the worker who is located in the set range in the 2nd alarm mode. Similarly, it is explanatory drawing which shows the detection state of the worker who is located in the set range at the time of the turning operation in the 2nd alarm mode.

1 to 5 show that the safety system of the present invention is applied to a pile driver which is one of construction machines. As shown in FIG. 1, the pile driver 11 is a lower traveling body provided with a crawler 12a. A base machine 14 composed of an upper swivel body 13 rotatably provided on the upper part of the lower traveling body 12 and the lower traveling body 12, an undulating leader 15 provided on the front portion of the upper swivel body 13, and a front of the leader 15. A pair of left and right guide pipes 16 and 16 provided parallel to the longitudinal direction of the leader 15 and a plurality of guide gives that slidably hold the outer surface side of each of the guide pipes 16 and 16 in the width direction of the base machine. To suppress the runout of an auger 18 which is one of the working devices provided so as to be able to move up and down and rotate along the front surface of the reader 15 via the auger 17 and a rod or a steel pipe pile which is driven by the auger 18 and rotates. Is provided with a lower anti-vibration member 19 provided so as to be able to move up and down along the lower front surface of the leader 15.

A driver's cab 20 on which the driver rides is installed in the front part on one side of the upper swing body 13, and a plurality of winches including a main winding winch and a supplementary winding winch (not shown) are in the central part of the upper swing body 13. ) Is provided, and a pair of left and right back stays 23, 23 that support the counterweight 21, the gantry 22, and the leader 15 are provided at the rear of the upper swing body 13. The main winding rope 24 from the main winding winch is connected to the auger 18 via a top sheave block 25 provided on the top of the leader 15, and the auger 18 can be raised and lowered by operating the main winding winch. The auxiliary winding rope 26 from the auxiliary winding winch is connected to the lower anti-vibration member 19 via the top sheave block 25, and the lower anti-vibration member 19 can be raised and lowered by operating the auxiliary winding winch. Further, jacks 27 for stabilization are provided at four locations on the front, rear, left and right sides of the upper swing body 13.

In the driver's cab 20, an operation lever and an operation pedal, a push button switch and a display, and a mode changeover switch (not shown), which are operation devices for performing a plurality of operations such as running, turning, winch, and auger 18, are described. Devices such as these are centrally arranged near the driver's seat in consideration of operability, and are mainly configured with a controller (CPU) that is connected to these devices and performs various arithmetic processing such as data processing and judgment. The control device is provided. Further, the upper swing body 13 is equipped with a communication device that is connected to the control device and communicates with a worker terminal carried by a worker engaged in work around the pile driver 11.

The communication device can divide a dangerous range as a set range around the pile driver 11 by transmitting an AC induced magnetic field having a predetermined frequency from a built-in magnetic field transmission unit, for example. As a result, the magnetic field detection unit of the worker terminal located within the danger range detects the AC induced magnetic field, so that the worker terminal transmits terminal information including position information and registered ID information (identification information). .. Then, the control device is controlled so as to transmit an alarm signal based on the terminal information acquired by the communication device. On the other hand, the worker terminal is controlled so as to generate vibration by an alarm buzzer or a vibrator that can be recognized by the operator in response to the alarm signal.

Further, the control device selectively executes the first alarm mode and the second alarm mode having different execution timings as one of the control methods (modes) by receiving the operation detection signal of the mode changeover switch. Is controlled. The first alarm mode is a control method for transmitting an alarm signal when the worker terminal is located within the danger range, and the second alarm mode is a driving method when the worker terminal is located within the danger range. This is a control method for transmitting an alarm signal when any of the driving operations such as turning, turning, winch, and auger 18 is performed. These elements constitute a safety system for the pile driver 11 that gives an alarm based on communication between the pile driver 11 and the worker terminal.

Here, with reference to FIGS. 2 to 5, various alarm modes executed by the control device according to the detection state of the worker terminal located in the danger range around the pile driver 11 will be described. First, since the large pile driver 11 has a weight limit during transportation, the reader 15, auger 18, counterweight 21, etc., which are components, are separated from the upper swing body 13 and transported separately, and these are transported at the construction site. Is assembled and used. When the pile driver 11 is brought into the field, for example, the leader 15 is undulatingly mounted on the front portion of the upper swivel body 13 by connecting a plurality of leader members to each other.

When the power is turned on, the engine of the assembled pile driver 11 is driven, and the pile driver 11 moves to the pile driving construction position by self-propelling. In this movement stage, the first alarm mode is set. FIG. 2 shows the detection states of the workers 51 and 52 engaged in the work around the pile driver 11. Around the pile driver 11, for example, a circular danger range 28 of 2 m to 5 m is set by a magnetic field transmitter, and an operator who has entered this range, for example, is performing assembly work. In response to the signal from the terminal carried by the 51, the control device transmits an alarm signal from the communication device 29 based on the acquired terminal information of the worker 51. At this time, the worker 51 can recognize that the nearby stopped pile driver 11 is about to start moving by the alarm issued by his / her terminal, or it seems that the worker 51 has entered the danger range 28 after starting to move. In this case, it can be recognized that the pile driver 11 is approaching. Here, the control device displays on the display in the driver's cab 20 that the worker 51 is in a state of approaching the pile driver 11, and the driver recognizes that the worker 51 is nearby while recognizing that the worker 51 is nearby. The necessary driving operations can be performed. Here, the alarm is not issued to the worker 52 outside the danger range 28, but when the worker 52 is located within the danger range 28 due to the approach of the pile driver 11, the worker 52 issues a terminal of his / her own terminal. It is possible to recognize that the pile driver 11 is nearby by the alarm.

Here, as shown in FIG. 3, the section of the danger range 28 is a fan-shaped forward range 30, a reverse range 31, and an upper swivel body as a travel range of the lower traveling body 12 including directly below the auger 18 and the lower anti-vibration member 19. The right turning range 32 and the left turning range 33 of 13 can be set as the setting range for each part, and even when the worker is located within these setting ranges for each part, the alarm signal is similarly transmitted. Control is performed to call attention to the operator by an alarm issued by the terminal.

The pile driver 11 that has moved to the construction position enters the work stage, and the four jacks 27 are grounded by the jack extension operation to perform the pile driving in a stable state. Here, when the mode changeover switch is operated by the driver to switch from the first alarm mode to the second alarm mode, as shown in FIG. 4, when the operating device is not operated and there is no operation. If so, no alarm is given to the worker 53 within the danger range 28. As a result, the worker 53 recognizes the existence of the pile driver 11 that has stopped operating, and the necessary work without receiving an alarm moves, for example, to the vicinity directly below the auger 18 and the lower vibration damping member 19. , It is possible to add rods and steel pipe piles buried in the ground. Then, even if the worker 53 who has finished the work retracts out of the danger range 28 and the winch operation corresponding to the raising and lowering of the auger 18 and the raising and lowering of the lower vibration member 19 is performed, for example, the worker 53 There is no danger.

When the pile driving operation is completed, the pile driver 11 performs a jack contraction operation to store the four jacks 27, and also operates in a direction away from the construction position by the operation operation. At this time, as for the control method, since the second alarm mode is still set, as shown in FIG. 5, for example, when the worker 54 is within the left turning range 33, that is, the worker. When the worker terminal carried by 54 is located within the left turn range 33, and when the driver performs a left turn operation as shown by arrow A in FIG. 5, the communication device 29 An alarm signal is transmitted, and a control is performed to call attention to the worker 54 by an alarm issued by the terminal.

As described above, according to the safety system of the construction machine of the present invention, the first alarm mode that generates an alarm on the condition that the worker terminal is located within the set range around the construction machine, and in addition to this condition. , A second alarm mode that generates an alarm when a driving operation is performed is controlled to be selectively executed. Therefore, for example, if the first alarm mode is set at the stage of moving the construction machine toward the work position, Even when a construction machine is about to start moving or there is a worker in the vicinity who is not aware of the approach after the start of movement, the worker can be alerted by an alarm. On the other hand, if the second alarm mode is set at the work stage after the construction machine has moved to the work position, the worker can work around the construction machine by his / her own will while recognizing the existence of the construction machine that is stopped. It is possible to prevent giving unnecessary warnings to workers. That is, it is possible to generate an alarm at the optimum time according to the operating state of the construction machine and ensure the safety of the workers working around the construction machine. In particular, at the site where the pile driver 11 is used, the operator engaged in the pile replenishment work can react sensitively to the alarm, and the work can proceed while sufficiently ensuring safety.

Further, by dividing the danger range 28 into a plurality of forward range 30 including directly under the work device, reverse range 31, left and right turning range 32, 33, etc., an alarm can be issued within a necessary range. As a result, it is possible to prevent unnecessary alarms while ensuring work safety. In addition, by applying the safety system of the present invention to the pile driver 11, if the worker needs to enter the danger range 28, this can be tolerated and the pile driving work can proceed safely. ..

In this embodiment, the safety system is applied to a pile driver, but the present invention is not limited to this, and can be widely applied to various construction machines equipped with a vertically movable excavator and a cargo handling device such as a shovel and a crane. .. In addition, the execution timing of various alarm modes can be set arbitrarily, and in the first alarm mode, the safety of nearby workers is ensured in situations where moving construction machinery is stopped halfway. In addition, it is particularly useful in that the safety of maintenance workers near the construction machine is ensured even in the situation where the construction machine is regularly maintained. Further, the worker terminal may be a small and wearable one, and examples thereof include a wristband type one that can be worn on the worker's arm and one that is attached to a helmet. In addition, the position information and ID information of the worker terminal may be acquired via the network using a positioning device such as GPS. Further, although the setting range is set by generating an induced magnetic field suitable for outdoor use, it can be set based on radio waves, ultrasonic waves, infrared rays, and an image acquired by a camera.

11 ... Pile driver, 12 ... Lower running body, 12a ... Crawler, 13 ... Upper swivel body, 14 ... Base machine, 15 ... Leader, 16 ... Guide pipe, 17 ... Guide give, 18 ... Auger, 19 ... Lower anti-vibration member , 20 ... cab, 21 ... counter weight, 22 ... gantry, 23 ... backstay, 24 ... main winding rope, 25 ... top sheave block, 26 ... auxiliary winding rope, 27 ... jack, 28 ... dangerous range, 29 ... communication Machine, 30 ... forward range, 31 ... reverse range, 32 ... right turn range, 33 ... left turn range, 51, 52, 53, 54 ... worker

Claims (3)

In a construction machine safety system that communicates between a construction machine and workers engaged in work around the construction machine and gives an alarm based on the communication.
It is composed of a communication device mounted on the construction machine and a worker terminal carried by the worker and receiving an alarm signal from the communication device to generate an alarm recognizable by the worker.
The construction machine includes a control device that controls the operation of the construction machine by operating the operation device provided in the driver's cab on which the driver is boarding.
The control device includes a first alarm mode in which the alarm signal is transmitted when the worker terminal is located within a set range around the construction machine, and the worker terminal is located within the set range. , The second alarm mode that emits the alarm signal when the operation operation corresponding to the operation is performed, is selectively executed.
A safety system for construction machinery, wherein the first alarm mode and the second alarm mode are configured to be configurable by a changeover switch provided in the driver's cab. The construction machine includes a base machine including a lower traveling body provided with a crawler, an upper rotating body provided so as to be rotatable on the upper portion of the lower traveling body, and a vertically movable movable body provided on the front portion of the upper rotating body. Equipped with work equipment
The set range includes a range of travel of the lower traveling body, a swivel range of the upper swivel body, and a danger range corresponding to a movable range of the work device around the construction machine. It is divided into
The safety system for construction machinery according to claim 1, wherein the operation is a plurality of operations including a turning operation of the upper rotating body, a traveling operation of the lower traveling body, and a vertical operation of the working device. The construction machine is a pile driver for creating piles in the ground, and the worker is a person engaged in pile replenishment work around the pile driver, claim 1 or 2. Described construction machinery safety system.

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