JP2014059183A - Impact force measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact force measurement device that can be used for determining an impact force when waste disposal cast into the sea sinks and strikes against the sea bottom.SOLUTION: An impact force measuring device 1, to which a cord 71 has been connected in order to pull out the device in an inspected cast zone of waste disposal, is cast into the sea. When the impact force measuring device 1 reaches the sea bottom, this device 1 is pulled up with the cord 71 provided for pulling it up. A memory card, on which measurement outputs from an impact measurement triaxial acceleration sensor, position information triaxial acceleration sensor, and triaxial gyro sensor provided in the impact force measuring device 1 have been recorded in time series, is removed. Using a computer system prepared separately, information about, for example, impact force applied to the sea bottom by the impact measuring device 1 and the place where the impact force measuring device 1 has reached the sea bottom, is derived.

Description

  The present invention relates to an impact force measuring device that measures an impact force when it is thrown into the sea and collides with the seabed.

  The amount of waste discharged from ordinary households and business establishments in recent years is enormous, and it is impossible to treat all waste at land treatment plants. Therefore, for example, as described in Patent Document 1, a processing method has been developed in which waste is dumped into the ocean and deposited on the seabed. In the case of dumping waste into the ocean, it is necessary to take measures so that waste and sewage that exudes from waste remain in the dumping area in order to prevent marine pollution as much as possible. The dumping area is surrounded by a partition wall, and the water level of the dumping area is kept lower than the surrounding seawater level so that not only waste but also sewage that exudes from the waste does not flow into the surrounding seawater.

JP 07-88454 A

In the waste disposal method described in Patent Document 1, it is possible to effectively prevent the wastewater flowing from the wastewater and wastewater from flowing into the seawater from flowing into the surrounding seawater. It also occurs through the ocean floor. Therefore, it is necessary to lay a water shielding sheet on the seabed of the waste dumping area or to form a clay layer (alluvial clay layer) that prevents infiltration of sewage that exudes from the waste. . Impermeable stratum (thickness more than 5 m, the permeability is 100 nm / sec (= 1 × 10 -5 ^{cm /} sec) or less of the formation or Rugion value 1 the following rock or its formation with equal or more water blocking potency ), There is no need for a sheet or other impermeable construction, so the clay layer on the seabed can be used effectively. By the way, laying a water-impervious sheet on the seabed takes a lot of trouble, and there is also a problem of maintenance and replacement of the water-impervious sheet. Therefore, effective use of the clay layer will be promoted, but even if a clay layer is formed on the seabed, the impact force when the dumped waste collides with the seabed will cause a long period of time. There is a possibility that damage such as cracks may occur in the clay layer. If cracks occur in the clay layer, the sewage that oozes from the waste will ooze into the ocean floor and cause marine and groundwater contamination.

  Therefore, when trying to use as a waste dumping area, not only investigate and confirm what kind of clay layer is in that area, but also how much impact force is applied to the clay layer by dumping waste. It is necessary to measure whether to join.

  Therefore, an object of the present invention is to provide an impact force measuring apparatus that can be used to determine the impact force when waste dumped in the sea descends the sea and collides with the seabed.

  In order to achieve this object, an impact force measuring device of the present invention is an impact force measuring device for measuring an impact force when it is thrown into the sea and collides with the seabed. And an impact measurement acceleration sensor that measures acceleration when it collides with the seabed, and a position information sensor that measures the position of the case thrown into the sea. From the acceleration measured by the impact measurement acceleration sensor, it is possible to derive the impact force applied to the case from the seabed when the case collides with the seabed, and hence the impact force applied to the seabed from the case. If this case is regarded as waste, it is possible to predict and determine the impact force applied to the seabed when the waste is actually thrown into the sea.

  Since the thickness and strength of the clay layer on the seabed vary depending on the location, in order to set the dumping area so that the clay layer is not damaged, the discarded waste will be distributed along with the distribution of the clay layer thickness in the planned dumping area. Information on how much impact force is applied at which position on the seabed is also required. However, since the impact force measuring device dumped in the seawater is swept away by the flow of seawater and reaches the seabed at a position different from the dumping position, where the impact force measuring device reaches the seabed, from where it is thrown away, You have to determine where you have reached the seabed. Therefore, the impact force measuring apparatus needs to have a position information sensor for measuring the position of the case thrown into the sea.

  The position information sensor can be a position information acceleration sensor that detects the acceleration of the case or the acceleration of the case in the sea, but it is difficult to detect the exact position of the case only by the acceleration sensor. Therefore, the position information sensor preferably includes a position information acceleration sensor for detecting the acceleration of the case and a gyro sensor for detecting the angular velocity of the case.

  The case has storage means for recording the outputs of the impact measurement acceleration sensor, the position information acceleration sensor, and the gyro sensor in the case, and the impact force measurement device that collided with the seabed is pulled up and recorded in the storage means. It is preferable that the output of each sensor is taken out so that the impact force and the seabed arrival position can be derived.

  When the impact force measuring device is too heavy and it is difficult to effectively predict when the waste is dumped from the measurement result, it is preferable to attach the float to the impact force measuring device and put it into the sea. The float is preferably configured so that it can be removed for the case where a float having a different size is attached or measurement is performed without attaching the float.

  If the impact force measuring device of the present invention is used, it is possible to determine in detail and predict the influence of a clay layer on the seabed when waste is dumped into the ocean or the ocean.

1 is an overall view of an impact force measuring device according to the present invention. It is a disassembled perspective view of an impact-force measuring apparatus. It is a figure which shows the structure of an impact-force measuring apparatus. It is a figure explaining the usage method of an impact-force measuring apparatus. It is a figure which shows the state which attached the float for density adjustment.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an overall view of an impact force measuring device according to the present invention, and FIG. 2 is an exploded perspective view of the impact force measuring device.

  The impact force measuring device 1 includes a metallic cylindrical case 3 that opens at one end (upper end) and the other end (lower end) in the length direction, and one lid 5 that hermetically closes one end side opening of the case 3. And the other lid 7 for sealingly closing the other end side opening of the case 3.

  One lid 5 has a disk-shaped lid body 9 and an auxiliary lid 13 fitted in a recess 11 formed on the upper surface of the lid body 9, and the bottom of the recess 11 of the lid body 9 is supported. A portion 17 is formed. The support operation unit 17 supports the upper ends of the control board 19 and the battery 21 and has a card insertion slot (not shown) into which the memory card 23 is inserted. A power supply member 25 connected to the battery 21 is disposed on the support operation unit 17. A measurement start switch 27 and a measurement stop switch 29 are provided on the upper surface of the support operation unit 17, and a power switch 31 and a power lamp 33 are provided on the upper surface of the power supply member 25. The auxiliary lid 13 has an attachment flange 37 at the outer end of the fitting portion 35, and the fitting portion 35 is fitted into the recess 11 formed on the upper surface of the lid body 9, and the attachment flange 37 is The lid main body 9 is detachably attached to the lid main body 9 so as to be fixed to the annular end surface on one end side with bolts 39. A transparent observation window 41 is provided in the center of the auxiliary lid 13, and the presence or absence of the power lamp 33 can be confirmed from the observation window 41. The lower end portions of the control board 19 and the battery 21 are connected to the interface board 43.

  One lid 5 having such a configuration is such that the control board 19 and the battery 21 are accommodated in the case 3, and the outer periphery of the lid body 9 is fixed to the one end side annular end surface of the case 3 with a bolt 45. 3 is detachably attached. In FIG. 2, reference numeral 47 is a temperature sensor that measures the temperature in the case 3, and reference numeral 49 is a power supply voltage sensor that measures the voltage of the battery 21.

  The other lid 7 is formed by providing the disk body 51 with a mounting portion 53 having a diameter smaller than that of the disk body 51, and a shock measurement triaxial acceleration sensor 55 and position information are provided on the front end surface of the mounting portion 53. A three-axis acceleration sensor 57 and a three-axis gyro sensor 59 are provided so that the mounting portion 53 enters the other opening of the case 3, and the outer periphery of the disc body 51 is bolted to the other annular end surface of the case 3. By fixing with 61, the other opening of the case 3 is hermetically closed. The impact measuring triaxial acceleration sensor 55, the positional information triaxial acceleration sensor 57, and the triaxial gyro sensor 59 provided on the front end surface of the mounting portion 53 are connected to the interface board 43, and are controlled via the interface board 43. Connected to the board 19.

  FIG. 3 is a diagram showing a configuration of the impact force measuring apparatus 1.

  When the power switch 31 of the power supply member 25 is turned on to supply power from the battery 21 to the impact force measuring device 1 and the measurement start switch 27 is turned on, the control unit 63 mounted on the control board 19 is used for impact measurement. A measurement start signal is sent to the triaxial acceleration sensor 55, the triaxial acceleration sensor 57 for position information, the triaxial gyro sensor 59, the temperature sensor 47, and the power supply voltage sensor 49, and the triaxial acceleration sensor 55 for impact measurement, the position information 3 Each of the axial acceleration sensor 57, the three-axis gyro sensor 59, the temperature sensor 47, and the power supply voltage sensor 49 receives the measurement start signal and starts measurement. The measurement output of each sensor 47, 49, 55, 57, 59 is sent to the memory card 23 (via the card interface 69) via the A / D converter 67 with the signal conditioner 65 mounted on the control board 19. Connected to the control unit 63) as time series data.

  The triaxial acceleration sensor 55 for impact measurement is a high acceleration sensor having a measurement range within ± 50 G, and when the impact force measuring device 1 is thrown into the sea, it descends into the sea and collides with the seabed and lifts up. The main purpose is to measure the acceleration when colliding with the seabed. The triaxial acceleration sensor 57 for position information is a low acceleration sensor having a measurement range within ± 3 G, and when the impact force measuring device 1 is thrown into the sea, it descends into the sea and collides with the seabed and lifts up. It measures the acceleration in each of the three axis directions until it is detected, but the main purpose is to measure the acceleration from when the impact force measuring device 1 is thrown into the sea until it descends into the sea and collides with the sea floor and stops. It is said. The triaxial gyro sensor 59 has a measurement range within ± 1000 degrees / second, from when the impact force measuring device 1 is thrown into the sea, until it descends into the sea, collides with the seabed, and is pulled up. The angular velocity in the three axis directions is measured. Since the acceleration when the impact force measuring device 1 collides with the seabed increases rapidly and decreases rapidly, the time when the acceleration increases rapidly and decreases rapidly can be regarded as a collision. Then, it is possible to calculate the impact force applied to the impact force measurement device 1 by the acceleration at the time of collision of the impact force measurement device 1, that is, the impact force applied to the seabed. Further, for example, the three accelerations in the three-axis directions in the coordinates of the impact force measuring device 1 measured by the position information three-axis acceleration sensor 57 and the three-axis gyro sensor 59, for example, the impact force measuring device 1 are measured. The movement position of the impact force measuring device 1 can be calculated in time series based on the three angular velocities around the three axes in the coordinates of 3 or 3 in the three-axis direction measured by the three-axis acceleration sensor 57 for position information. The moving position of the impact force measuring device 1 can be calculated in time series from the two accelerations and the yaw angle, roll angle, and pitch angle measured by the three-axis gyro sensor 59, and the position information three-axis acceleration sensor 57 and The position and position information of the three-axis acceleration sensor 57 and the three-axis gyro of the impact force measuring device 1 at the time of the collision with the sea floor, which is grasped from the measurement result of the three-axis gyro sensor 59. Position of the impact force measuring device 1 during stop of the submarine, which is grasped by the measurement result of the sensor 59 can be calculated. For example, the moved position of the impact force measuring apparatus 1 is specified using the yaw angle, pitch angle, and roll angle detected by the triaxial gyro sensor for the acceleration detected by the triaxial acceleration sensor.

  FIG. 4 is a diagram for explaining how to use the impact force measuring apparatus 1.

  The survey ship 69 is stopped in the planned dumping area of the waste, and the impact force measuring device 1 connected with the lifting string 71 is dumped from the survey ship 69 into the sea. At the time of disposal, the auxiliary lid 13 is removed, the power switch 31 of the power supply member 25 is turned on, the measurement start switch 27 is turned on, and the auxiliary lid 13 is attached again. The position information calculated from the measurement results of the position information triaxial acceleration sensor 57 and the triaxial gyro sensor 59 is based on the dumping position, for example. When the impact force measuring device 1 reaches the seabed and stops, the impact force measuring device 1 is lifted to the research ship 69 by the lifting string 71. Then, the auxiliary lid 13 is removed, and the measurement stop switch 29 is turned on or pushed, and then the power switch 31 of the power supply member 25 is turned off. Then, the power supply member 25 is removed, and the memory card 23 is extracted. In the extracted memory card 23, the measurement outputs of the impact measurement triaxial acceleration sensor 55, the positional information triaxial acceleration sensor 57, the triaxial gyro sensor 59, the temperature sensor 47, and the power supply voltage sensor 49 are recorded in time series. Therefore, the memory card 23 is inserted into a separately prepared computer system and the time series measurement data recorded is displayed, or necessary data or information is calculated from the time series measurement data, and the impact force measuring device Information such as the impact force applied to the seabed from 1 and the seabed arrival position of the impact force measuring device 1 is secured.

  In addition, you may throw the impact-force measuring apparatus 1 into a planned dumping area with sand and gravel so that it may approach the aspect at the time of actually dumping waste. Further, when the impact force measuring device 1 has a higher density than the waste to be dumped, as shown in FIG. 5, for example, a foam-made density adjusting float 73 made of urethane foam is used to measure the impact force. It may be attached to the device 1. Attachment can be performed by forming an attachment hole 75 in the density adjusting float 73 and passing the impact force measuring device 1 through the attachment hole 75. The mounting hole 75 is preferably made of an elastic material on the inner surface and smaller in diameter than the impact force measuring device 1 so that the density adjusting float 73 does not easily come off. The density adjusting float 73 can have an outer shape (FIG. 5 a) obtained by cutting the protrusion side of the hemisphere or an outer shape (FIG. 5 b) obtained by cutting both sides of the sphere.

  The impact force measuring device of the present invention can be used, for example, in a planned waste disposal area.

DESCRIPTION OF SYMBOLS 1 Impact force measuring device 3 Case 55 3-axis acceleration sensor for impact measurement 57 3-axis acceleration sensor for position information 59 3-axis gyro sensor

Claims (4)

An impact force measuring device that measures impact force when it is thrown into the sea and collides with the seabed,
A sealed case, an acceleration sensor for measuring an impact force when the case is thrown into the sea and collides with the seabed, a position information sensor for measuring the position of the case thrown into the sea, An impact force measuring device characterized by comprising:   2. The impact force according to claim 1, wherein the position information sensor includes a position information acceleration sensor for detecting the acceleration of the case and a gyro sensor for measuring an angular velocity of the case. measuring device.   3. The impact force measuring device according to claim 2, further comprising storage means in the case for recording outputs of the impact measurement acceleration sensor, the position information acceleration sensor, and the gyro sensor. .   The impact force measuring device according to claim 1, 2 or 3, further comprising a detachable float.

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