JP5090845B2 - Method and apparatus for measuring sediment flow rate in sediment transport system - Google Patents

Description

  The present invention provides a hopper capable of introducing slurry-like earth and sand at any time and capable of storing the introduced earth and sand, a transport pipe for transporting the earth and sand to a predetermined location away from the hopper, The present invention relates to a sediment flow measurement method and apparatus in a sediment transport system including a sediment push-in device that takes in stored sediment from the bottom of a hopper and forcibly pushes it into a transport pipe.

  In the present invention, “slurry earth and sand” means dredged earth and other earth and sand containing a large amount of water, and various mud and earth, and has fluidity in a hopper and a transport pipe.

  Conventionally, when pumping slurry-like earth and sand such as dredged sand to a remote place through a transport pipe, a sand and sand pushing device that takes in and stores dredged sand into the hopper and forcibly pushes it into the transport pipe. The one that is pushed into the transport pipe is known.

And conventionally, the sediment flow rate supplied into the transport pipe from the sediment push-in device is measured using an electromagnetic flow meter provided at an appropriate position (for example, upstream end) of the transport pipe, and the transport of the sediment based on the measured value. Management is done.
`` Electromagnetic flowmeter '' www.tokyokeiso.co.jp/techinfo/magazine/pd.

  Electromagnetic flowmeters have excellent durability and wear resistance because the measuring section is not exposed in the transport pipe (measuring fluid) and is not in contact with the measuring fluid. It is suitable for measuring the flow rate of slurry-like soil (eg dredged soil) flowing in the pipe.

  However, stones and sand of various sizes, such as dredged sand, sludge, silt, etc. with different viscosities are mixed non-uniformly, and various foreign substances (for example, metal pieces, wood pieces, rubber pieces, etc.) may be mixed. When measuring the flow rate of a fluid with an electromagnetic flow meter, the conductivity distribution of the fluid in the pipe is not uniform, and the flow velocity in the pipe is not uniform due to the difference in specific gravity of each part of the fluid in the pipe. It was difficult to measure the flow rate, and there was a problem that the measurement error was not small.

  The present invention has been made in view of such circumstances, and the flow rate of sediment pushed into the transport pipe from the sediment pushing device can be accurately measured at a relatively low cost without using an electromagnetic flow meter. An object of the present invention is to provide a method and apparatus for measuring sediment flow rate in a sediment transport system.

In order to achieve the above object, the invention of claim 1 is characterized in that a slurry-like earth and sand can be introduced at any time and the introduced earth and sand can be stored, and the earth and sand are transported to a predetermined location away from the hopper. In the method for measuring sediment flow in a sediment transport system comprising a transport pipe for transporting and a sediment pressing device for forcing the stored sediment in the hopper from the bottom of the hopper and forcibly pushing it into the transport pipe, the sediment storage height in the hopper A height sensor to be detected is provided in the hopper, and information on the amount of sediment stored in the hopper corresponding to the sediment storage height is obtained in advance in at least a part of the height region of the hopper, and the operation of the soil pushing device is performed. among the by the height sensor to measure the sediment reservoir height, obtains an estimate of the sediment storage amount in the hopper from its measured value and the information, time change of the estimated value Luo estimated value extracts the flow rate operation performed section is decreasing constantly, based on the decreasing slope with respect to time change of the estimated value at the flow rate operation carried interval, sediment pushed into the transport pipe from the soil pressing device The flow rate is calculated .

In addition to the features of the invention of claim 1 , the invention of claim 2 is characterized in that the estimated value rises rapidly immediately after the earth and sand is introduced, and then gradually decreases after the earth and sand is intermittently charged into the hopper. When the change pattern of repeating is repeated, the flow rate calculation execution section when the period between the previous sediment input and the current sediment input is shorter than the predetermined time is the first set time from the previous sediment input time. The starting point is the elapsed time, and the end point is a time that is a second set time shorter than the first set time from the time when the earth and sand is put in this time.

The invention of claim 3 is characterized in that, in addition to the features of the invention of claim 1 or 2 , the estimated value rises rapidly immediately after the sediment is introduced, and then gradually increases. When the change pattern of decreasing is repeated, the flow rate calculation execution section when the period between the previous sediment input and the current sediment input is longer than the predetermined time is every time the predetermined time elapses. After setting the measured flow rate update point, the starting point is the time when the previous settling time or the first set time has elapsed from the previous measured flow rate update point, and the current measured flow rate update point or the current sediment load point From the above, the end point is a time that is traced back by a second set time shorter than the first set time.

According to a fourth aspect of the present invention, in addition to the features of any of the first to third aspects, the height sensor intermittently outputs a detection signal corresponding to the sediment storage height in a predetermined detection cycle. In order to equalize the cycle output values, a moving average value of the predetermined number of cycle output values is obtained by a filter means, and the moving average value is used as the measured value.

According to a fifth aspect of the present invention, in addition to any one of the features of the first to fourth aspects, a calculation for calculating a time change rate of the amount of sediment stored in the hopper in a predetermined calculation cycle from the measured value and the information. Means for calculating the moving average value of the predetermined number of cycle calculation values by means of the filter means to equalize the cycle calculation value, and judging whether or not soil has been thrown in based on whether or not the calculated moving average value exceeds the predetermined value It is characterized by doing.

Further, the invention of claim 6 is a hopper capable of introducing slurry-like earth and sand at any time and storing the introduced earth and sand, and a transport pipe for transporting the earth and sand to a predetermined place away from the hopper. The sediment flow measuring device in the sediment transport system comprising a sediment pushing device that takes in the sediment stored in the hopper from the bottom of the hopper and forcibly pushes it into the transport pipe is attached to the hopper, and the sediment storage height in the hopper is increased. A height sensor to detect, storage means for storing information on the amount of sediment stored in the hopper corresponding to the sediment storage height determined in advance in at least a part of the height of the hopper, and operation of the sediment pushing device in previous SL and a flow rate calculation means for calculating the flow rate of the sediment to be pushed into the transport pipe from the soil pressing device, said flow rate calculation means, wherein during operation of soil pressing device, before The flow rate calculation in which the estimated value of the sediment storage amount in the hopper is obtained from the measured value of the sediment storage height detected by the height sensor and the above information, and the estimated value is steadily decreasing from the time change of the estimated value. extract the implementation section, from decreasing gradient with respect to time change of the estimated value at the flow rate operation carried interval and calculates the sediment flow.

As described above, according to the first and sixth aspects of the present invention, information on the amount of sediment stored in the hopper corresponding to the height of sediment stored in the hopper is obtained in advance in at least a partial height region of the hopper. During the operation of the earth and sand pushing device, the earth and sand storage height is measured by the height sensor provided in the hopper, and the flow rate of the earth and sand pushed into the transport pipe from the earth and sand pushing device is calculated based on the measured value and the information. As a result, the sediment flow rate during operation of the sediment indentation device can be easily measured at a relatively low cost without using an electromagnetic flow meter, and the transport management of sediment can be accurately performed at a low cost. .

In addition, during the operation of the sediment indentation device, the estimated value of the sediment storage amount in the hopper is obtained from the measured value of the sediment storage height detected by the height sensor and the above information, and the estimated value is steady from the time change of the estimated value. The flow rate calculation area that is decreasing is extracted, and the sediment flow rate is calculated from the decreasing gradient with respect to the time change of the estimated value in the flow rate calculation execution period. It is possible to calculate the sediment flow rate accurately and accurately while avoiding the influence of the disturbance of the stored sediment level in the hopper from the decreasing gradient of the estimated value in the flow rate calculation execution section that is stably decreasing.

In particular, according to the invention of claim 2 , since the earth and sand are thrown into the hopper intermittently with the use of a loading machine such as a backhoe, the measured value of the amount of sediment is rapidly increased immediately after the earth and sand is charged. When the change pattern of gradually decreasing is repeated, the flow rate calculation execution section when the period between the previous sediment input and the current sediment input is shorter than the predetermined time is the first interval from the previous sediment input time. The starting point is when the set time elapses, and the end point is the time set a second set time shorter than the first set time from the time when the earth and sand is put in this time, so the measured value gradually decreases. In the decreasing section, it is possible to extract the flow calculation execution section suitable for the sediment flow measurement as long as possible while avoiding the influence of the disturbance of the stored sediment level in the hopper, and this allows the stored sediment level to be extracted. Without being affected by disturbances, the measurement of sediment flow can be performed precisely precisely as much as possible a wide range of measured section.

Further, in particular, according to the invention of claim 3 , since the earth and sand is thrown into the hopper intermittently with the use of a loading machine such as a backhoe, the measured value of the amount of sediment is rapidly raised immediately after the earth and sand is thrown in, and thereafter When the change pattern of gradual decrease is repeated, the flow rate calculation execution section when the period between the previous sediment input and the current sediment input exceeds the predetermined time is longer than the predetermined time. After setting the measured flow rate update point every time, the starting point is the time when the first set time has passed since the previous sediment flow point or the previous measured flow rate update point, and the current measured flow rate update point or the current sediment rate Since the end point is when the second set time, which is shorter than the first set time, is set as the end point, the stored sediment level in the hopper immediately after the load is reached even when the sediment input interval is relatively long. Disorder Without being affected, (per i.e. the predetermined time) periodically measuring the sediment flow went to accurately, the measured flow rate can go regularly updated accurately.

In particular, according to the invention of claim 4, the height sensor provided in the hopper intermittently outputs a detection signal corresponding to the sediment storage height in a predetermined detection cycle, and to equalize the cycle output value, Since the moving average value of the cycle output value of the predetermined number of times is obtained by the filter means and the moving average value is set as the measured value, the influence of the variation in the detection data is eliminated as much as possible, and the sediment storage height is measured. The value can be obtained with high accuracy, and the measurement accuracy of the sediment flow rate can be further enhanced.

In particular, according to the invention of claim 5 , the cycle calculation value is provided with calculation means for calculating a time change rate of the sediment storage amount in the hopper from a measured value of the sediment storage amount and the information. In order to level out, the moving average value of the predetermined number of cycle calculation values is obtained by the filter means, and it is determined whether the obtained moving average value exceeds the predetermined value or not. It is possible to obtain the time change rate of the sediment storage height with high accuracy by eliminating the influence of the variation of the detection data due to the disturbance of the stored sediment level in the interior. Since it can be judged accurately, the measurement accuracy of sediment flow rate can be further enhanced.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  In the accompanying drawings, FIGS. 1 to 13 show an embodiment of the present invention, FIG. 1 is an overall longitudinal sectional view showing an outline of a pneumatic transfer system for dredged sand, and FIG. 2 is a quantitative supply. FIG. 3 is a plan view of the hopper (viewed in the direction of arrow 3 in FIG. 2), FIG. 4 is a sectional view taken along line 4-4 in FIG. 5 is a sectional view taken along line 5-5 in FIG. 2, FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 5, FIG. 7 is an enlarged view taken along arrow 7 in FIG. FIG. 9 is a sectional view taken along line 9-9 in FIG. 7, FIG. 10 is a sectional view taken along line 10-10 in FIG. 7, and FIG. 11 is a map showing the relationship between sediment storage height and sediment storage amount in the hopper body. FIG. 12 is a timing chart showing an example of a temporal change in sediment storage height in the hopper body, and FIG. 13 is a flowchart showing an example of a sediment flow calculation process. A. 14 is a diagram corresponding to FIG. 8 showing a modification of the third seal device, and FIG. 15 is a diagram corresponding to FIG. 9 showing a variation of the third seal device.

  First, in FIGS. 1 to 4, a pneumatic transfer system for continuously transferring a large amount of dredged sand as a slurry-like transfer object stores dredged sand 1 generated in another dredging work place inside. It is equipped with a soil transport ship BB that can be transported by water, a mud work ship BA that can be placed next to the soil transport ship BB, and a transport pipe P that extends from the work site BA to a landfill U as a sediment disposal site. A large amount of dredged sand 1 is transferred from the mud working ship BA to the landfill U via the pipe P using air pressure. The transport pipe P is supported in a floating state by the float f in the water portion.

  The dredging work ship BA is charged with a stationary type earth and sand take-out device SH that scrapes the dredged sand 1 stored in the earth transport vessel BB and the dredged sand 1 taken out from the earth carrying vessel BB by the earth and sand take-out device SH. A hopper HO, a fixed amount supply device SS as a sediment pushing device that is connected to the lower part of the hopper HO and can push the dredged sand 1 in the hopper HO into the transport pipe P and supply the fixed amount, and a transport pipe P A compressed air mixing device SA for assisting the transport of earth and sand by mixing compressed air at the upstream end is mounted.

  The earth and sand take-out device SH is commonly referred to as a backhoe, and can be raised on a swivel base 3 standing on a hull of a mud working vessel BA so as to be able to turn 360 ° around a vertical axis, and on the front of the swivel base 3. And a bucket 5 connected to the tip of the refracting boom 4 so as to be swingable. By the cooperation of the swivel base 3, the refracting boom 4 and the bucket 5, the earth transport ship BB is provided. The dredged sand 1 can be intermittently thrown into the hopper HO of the mud working vessel BA.

  The hopper HO includes an inverted quadrangular pyramid-shaped hopper body 100 having an open upper surface, and a rectangular tube-shaped hopper base 101 connected to the lower end of the hopper body 100, and an upper end portion of the hopper body 100. Is provided with a lattice-shaped protective grill 102 that covers the open upper surface thereof and prevents entry of coarse foreign matter into the hopper body 100.

  Near the center of the protective grill 102, an ultrasonic level sensor SE as a height sensor is mounted with a transmitter and a receiver arranged downward, and the ultrasonic level sensor SE. A protective cover 103 covering the upper side of the protective grille 102 is fixed to the protective grill 102.

  The ultrasonic level sensor SE can accurately measure the sediment storage height in the hopper HO from the time difference between transmission and reception of ultrasonic waves, and its structure and measurement principle are conventionally known. Is omitted. The height sensor of the present invention is not limited to the ultrasonic level sensor of the embodiment, and for example, a microwave type level meter or a laser type level meter can be used.

  The ultrasonic level sensor SE is connected to a personal computer PC installed in a work room (not shown) installed at an appropriate position of the mud work boat BA.

  This personal computer PC stores storage means for storing information on the amount of sediment stored corresponding to the sediment storage height obtained in advance with respect to the hopper HO, and sediment storage calculated from the stored information and a detection signal of the ultrasonic level sensor SE. It has each function of the flow volume calculating means which calculates the flow volume of the earth and sand pushed into the transport pipe P from this fixed quantity supply apparatus SS based on the measured value of height.

  In the storage means, calculation is performed based on the shape and dimensions of the hopper body 100 in the height region of at least a part of the hopper HO (in the illustrated example, almost the whole except the upper end portion of the hopper body 100), or experimental data. Is stored in advance, and information on the amount of sediment stored in the hopper HO corresponding to the sediment storage height is stored. For example, as shown in FIG. 11, the stored information is mapped (graphed) in association with the sediment storage height in the hopper body 100 and the sediment storage amount in the hopper HO, or in experimental data. It is stored in the storage means in the personal computer PC in a form expressed as an approximate expression obtained based on the above. Then, based on the stored information and the measured value of the sediment storage height, an estimated value of the sediment storage amount corresponding to the measured value of the sediment storage height is derived.

  The ultrasonic level sensor SE intermittently detects a detection signal corresponding to the sediment storage height in the hopper body 100, that is, a cycle output value h at a predetermined detection cycle (in the illustrated example, a cycle of 0.5 seconds). Output to PC. The personal computer PC serves as a moving average calculating means for calculating the moving average value hf of the cycle output values for a predetermined number of times (in the illustrated example, 5 times = 2.5 seconds), that is, as a filter means, to equalize the cycle output value h. The calculated moving average value hf is a measured value of the sediment storage height for each detection cycle. Thus, during the operation of the quantitative supply device SS as the earth and sand pushing device, the personal computer PC calculates the measured value hf of the earth and sand storage height for each detection cycle based on the detection signal of the ultrasonic level sensor SE as described above. Output.

  Further, the personal computer PC calculates the sediment storage amount V in the hopper HO from the measured value hf of the sediment storage height obtained as described above and the stored information in which the sediment storage height and the sediment storage amount are associated in advance. The estimated value and the time rate of change dV of the sediment storage amount V are calculated in a predetermined calculation cycle (cycle of 0.5 seconds in the illustrated example). In this case, the personal computer PC calculates the moving average value dVf of the cycle calculation value of a predetermined number of times (5 times in the illustrated example = 2.5 seconds) in order to equalize the cycle calculation value of the time change rate dV of the sediment storage amount V. The moving average calculating means that functions as a filter means, that is, the calculated moving average value dVf is used as an estimated value of the temporal change rate of the sediment storage amount for each calculation cycle, and this estimated value dVf It is determined whether or not soil has been thrown in based on whether or not the value has rapidly increased and exceeded a predetermined value α. That is, the time when the estimated value dVf exceeds the predetermined value α is defined as the time when the earth and sand is introduced.

  By the way, when the earth and sand is thrown into the hopper HO intermittently by the earth and sand take-out device SH such as a backhoe, for example, as illustrated in FIG. Then, the change pattern of gradually decreasing is repeated. In FIG. 12, line X is obtained by connecting the measured values hf of the sediment storage height for each detection cycle (that is, the moving average value of the cycle output value from the ultrasonic level sensor SE). A large number of points scattered around the line X indicate the magnitude of the detection signal from the ultrasonic level sensor SE, that is, the cycle output value h.

  Then, the flow rate calculation means in the personal computer PC extracts the flow rate calculation execution section Lm in which the estimated value of the sediment storage amount V calculated from the measured value of the sediment storage height by the level sensor SE is steadily decreasing, Based on the decreasing gradient of the sediment storage amount in the section Lm with respect to time, the flow rate Q of sediment pushed into the transport pipe P from the quantitative supply device SS as the sediment pushing device is calculated, and the history of the calculated values is stored and the personal computer Display on PC monitor.

  In this case, the flow rate calculation interval Lm when the period between the previous sediment input and the current sediment input is shorter than the predetermined time T (1 minute in the illustrated example) is the previous sediment input point and the current sediment input. In the reference measurement section L between the point and the point, when the first set time t1 (for example, 15 seconds) has passed since the last time when the measured value suddenly rose, the next measured value Is determined as the end point when the current settling time has risen abruptly by a second set time t2 (for example, 5 seconds) shorter than the first set time t1. According to such a method for identifying Lm, in the reference measurement section L in which the measured value of the sediment storage amount gradually decreases, the flow rate calculation execution section Lm suitable for the sediment flow measurement is set to the stored sediment level in the hopper HO. It is possible to extract as long as possible while avoiding the influence of the disturbance of the sediment, and thereby the sediment flow rate can be accurately and accurately measured in the widest possible measurement section without being affected by the disturbance of the stored sediment level. If the interval between the previous sediment input and the current sediment input is too short and the flow rate calculation execution section Lm cannot be secured, the measurement of the sediment flow rate during this period is not executed.

  On the other hand, the flow rate calculation execution interval Lm when the period between the previous sediment input and the current sediment input exceeds a predetermined time T (1 minute in the illustrated example) is long every time the predetermined time T elapses. After setting the measured flow rate update point, the starting point is the time when the first set time t1 (for example, 15 seconds) has passed since the previous sediment injection time or the previous measured flow rate update point, and the current measured flow rate update point Alternatively, the end point is specified as the end point of the second set time t2 (for example, 5 seconds) shorter than the first set time t1 from the current earth and sand input time. According to such Lm identification method, even when the sediment input interval is relatively long, the sediment flow rate is regularly measured without being affected by the disturbance of the stored sediment level in the hopper immediately after the sediment injection ( That is, it can be performed accurately (every predetermined time T), and the measured flow rate can be updated periodically with high accuracy. In addition, when the interval between the previous measured flow rate update point and the current sediment input is too short to secure the flow rate calculation section Lm, the sediment flow rate measurement is not performed during this period.

  Next, an example of the calculation process of the sediment flow rate will be described with reference to the flowchart of FIG.

  First, the sediment storage height h (cycle output value) detected by the ultrasonic level sensor SE in step S1 is read, and then in step S2, the moving average value hf over the predetermined number of detection values h, that is, the sediment storage height. Read the measured value.

  Further, in step S3, the estimated value of the sediment storage amount V is calculated based on the measured value hf of the sediment storage height and the stored information in which the sediment storage height and the sediment storage amount are associated in advance.

  Next, in step S4, the time change rate dV (cycle calculation value) of the estimated value of the sediment storage amount V is calculated, and in step S5, the moving average value dVf over the predetermined number of times of the time change rate dV is read.

  Thereafter, in step S6, it is determined whether or not the moving average value dVf exceeds the threshold value α (that is, whether or not earth and sand have been thrown in this time). It is determined whether or not T (1 minute in the illustrated example) has elapsed (that is, before the first measured flow rate update point). If the answer is YES in step S7, the process proceeds to step S8, and a section from [previous earth and sand injection point + t1] to [current earth and sand injection point-t2] is specified as the flow rate calculation execution area Lm.

  Next, proceeding to step S9, estimated value data of the sediment storage amount V with respect to the elapsed time in the specified flow rate calculation execution section Lm is retrieved from the storage means, and a primary approximate expression (V = a × t + b) is obtained from this data. Then, the sediment flow rate Q is calculated from the decreasing gradient a, and then the process returns.

  If this time has already passed the first measured flow rate update point and it is determined NO in step S7, the process proceeds to step S10, where [last measured flow rate update point + t1] to [current sediment input point− The interval t2] is specified as the flow rate calculation execution interval Lm, and then the process proceeds to step S9.

  Also, if there is no earth or sand input at this time and it is determined NO in step S6, the process proceeds to step S11, where it is determined whether or not this time is a measured flow rate update point. If YES, the process proceeds to step S12. Then, it is determined whether or not the measured flow rate update point is the first update point. If the answer is yes in step S12, the process proceeds to step S13, and the section from [previous earth and sand input point + t1] to [current measured flow rate update point-t2] is specified as the flow rate calculation execution section Lm. Then, the process proceeds to step S9.

  If the current measurement flow rate update point is not the first update point and it is determined NO in step S12, the process proceeds to step S14, and [the previous measurement flow rate update point + t1] to [current measurement flow rate update point]. The section of point -t2] is specified as the flow rate calculation execution section Lm, and then the process proceeds to step S9.

  In addition, when there is no earth and sand input at this time and it is not the measured flow rate update point, it is determined NO in steps S6 and S11, and the process returns.

  Thus, in this embodiment, information on the amount of sediment stored corresponding to the sediment storage height in the hopper HO is obtained and stored in advance in the height region of at least a part of the hopper HO (substantially the entire hopper body 100). In addition, during operation of the quantitative supply device SS as the earth and sand pushing device, the ultrasonic level sensor SE measures the earth and sand storage height of the hopper main body 100, and uses the measured value (moving average value in the illustrated example) and the stored information. Based on this, the sediment flow rate Q is calculated.

  In this case, in the illustrated example, an estimated value of the sediment storage amount V in the hopper is obtained from the measured value of the sediment storage height and the stored information, and the estimated value steadily decreases from the time change of the estimated value. Since the flow rate calculation execution section Lm is extracted and the sediment flow rate is calculated from the decreasing gradient with respect to the time change of the estimated value in the section Lm, the actual decrease of the stored sediment in the hopper, in particular, steadily and stably decreasing. It is possible to calculate the sediment flow rate Q accurately and accurately, while avoiding the influence of the disturbance of the stored sediment level in the hopper HO, from the decreasing slope of the sediment storage amount V in the current flow calculation execution section Lm. As described above, the sediment flow rate can be accurately measured at a relatively low cost without using an electromagnetic flowmeter, and the transport management of the sediment can be accurately performed at a low cost.

  In the illustrated example, the ultrasonic level sensor SE as the height sensor intermittently outputs a detection signal corresponding to the sediment storage height at a predetermined cycle (for example, at intervals of 0.5 seconds), and the cycle output value. In order to equalize, a moving average value of cycle output values of a predetermined number of times (for example, 5 times, that is, 2.5 seconds) is obtained by a moving average calculating means as a filter means in the personal computer PC, and the moving average value is stored. Since it is handled as a measured value of height, it becomes possible to obtain the measured value of sediment storage height with high accuracy by eliminating the influence of variation in detection data by ultrasonic level sensor SE as much as possible. Measurement accuracy can be further increased.

  Further, in the illustrated example, the personal computer PC calculates the sediment storage amount in the hopper HO from the measured value of the sediment storage height obtained as described above and the storage information in which the sediment storage height and the sediment storage amount are associated in advance. The time change rate dV of V is calculated at a predetermined calculation cycle (in the illustrated example, a cycle of 0.5 seconds). Moreover, the personal computer PC calculates the moving average value dVf of the cycle calculation value for a predetermined number of times (5 times = 2.5 seconds in the illustrated example) in order to equalize the cycle calculation value of the time change rate dV of the sediment storage amount. The calculated moving average value dVf is used as an estimated value of the rate of change of the sediment storage time for each calculation cycle, and the presence or absence of sediment is determined depending on whether or not this estimated value exceeds a predetermined value. The time change rate of the sediment storage height can be obtained with high accuracy and the presence / absence of the sediment can be accurately judged from the obtained time change rate, so that the flow measurement accuracy is improved.

  Next, with reference to FIGS. 2-10, the specific structure of fixed_quantity | feed_rate supply apparatus SS as an earth-and-sand pushing apparatus is demonstrated. This fixed quantity supply device SS has a cylindrical drum portion Hd whose axis is substantially horizontal and is detachably fixed to the hull upper surface B of the mud working vessel BA as an installation surface, and the drum portion Hd. And a rotor R that is housed inside and rotates about the axis of the drum portion Hd.

  An upward inlet I is opened in the upper part of the peripheral wall of the drum portion Hd, and a downward outlet O is opened in the lower part of the peripheral wall. The inlet I is a hopper HO that stands integrally with the upper part of the housing H. The upstream end of the transport pipe P is connected to the bottom of the inside, that is, the hopper base 101 directly, and the outlet O is connected to the outlet O through a sediment discharge pipe 6 whose middle part is bent sideways.

  On the outer peripheral surface of the rotor main body Rm of the rotor R, a plurality of concave groove portions Rma that define a plurality of transfer chambers C arranged at equal intervals in the circumferential direction are provided between the inner peripheral surface of the drum portion Hd. That is, the rotor body Rm includes a substantially horizontal rotor shaft Rj penetrating through the drum portion Hd, a plurality of rotor blades Rw extending radially from the outer periphery of the intermediate portion of the rotor shaft Rj at equal intervals in the circumferential direction, and a plurality of rotor blades Rw. A pair of disk-shaped end walls Re that close both ends in the axial direction of the concave groove portion Rma are integrated with each other, and the concave groove portion Rma is formed between two rotor blades Rw adjacent to each other in the circumferential direction.

  Thus, when the rotor R is rotated, the plurality of transfer chambers C are rotated according to the rotation, and the transfer chambers C are periodically communicated with the inlet I and the outlet O. The flowable slurry-like dredged sand 1 charged and stored is dropped and accommodated sequentially through the inlets I into the plurality of transfer chambers C according to the rotation of the rotor R, while the dredged sand 1 in these transfer chambers C is stored. Are sequentially dropped and supplied through the outlet O into the sediment discharge pipe 6 and further into the transport pipe P.

  Circular large-diameter through holes Hdh having an inner diameter that is substantially the same as the outer diameter of the rotor body Rm (slightly smaller in the illustrated example) are formed in both end walls of the drum portion Hd. In the illustrated example, the inner diameter of the large-diameter through hole Hdh and the inner diameter of the inner peripheral surface of the drum portion Hd are the same.

  Both end portions of the rotor shaft Rj protrude outward from the center portions of the outer surfaces of the pair of disk-shaped end walls Re through the large-diameter through holes Hdh, and are supported independently from the housing H on the hull upper surface B as an installation surface. At the same time, one end thereof is interlocked and connected to the rotation driving means M outside the housing H. That is, on the upper surface B of the hull, a pair of support arms 10 and 11 are integrally erected on both sides of the housing H, and bearings (not shown) are provided at the upper ends of the support arms 10 and 11. Both end portions of the rotor shaft Rj are rotatably supported, and one end portion of the rotor shaft Rj is interlocked and connected so that the output shaft of the motor M as a rotation driving means rotates integrally. The motor casing is fixedly supported on the hull upper surface B.

  Between the outer peripheral portion of the disc-shaped end wall Re in the rotor body Rm and the opening edge portion of the large-diameter through hole Hdh in the corresponding end wall of the drum portion Hd, relative rotation and misalignment of both of them are allowed. Relative rotation between the part sealed between the transfer chambers C adjacent to the outer peripheral part of the rotor body Rm and the inner peripheral surface of the drum part Hd is sealed by the first sealing device S1. And the second sealing device S2 that allows misalignment seals the entire length of the rotor body Rm in the axial direction.

  The first seal device S1 is detachably fixed to either one of the drum portion Hd or the disk-shaped end wall Re (disk-shaped end wall Re in the illustrated example) with a bolt B1, and the other (illustrated example). Then, the ring-shaped lid plate T that covers the outer end surface around the large-diameter through hole Hdh of the drum portion Hd) with an axial gap, and the lid plate T and one of the other (in the illustrated example, the drum portion Hd) And at least one pair of annular sealing means 12 and 13 which are slidably contacted with each other so as to be slidable relative to each other. The inner peripheral portion of the inner surface of the lid plate T is in liquid-tight contact with the outer end surface of the disc-shaped end wall Re via an elastic seal ring.

  The first annular seal means 12 includes a first annular seal plate 12a which is detachably attached to the inner periphery of the cover plate T with a bolt B5 and is liquid-tightly joined over the entire circumference, and a bolt on the outer end surface of the drum portion Hd. It is composed of a pair of elastic seal rings 12b and 12c which are attached to a ring-shaped seal receiving plate 14 which is detachably attached with B4 and is liquid-tightly joined over the entire circumference and arranged concentrically with each other. The pair of elastic seal rings 12b and 12c are in pressure contact with the first annular seal plate 12a so as to be slidable relative to each other.

  The second annular seal means 13 includes a second annular seal plate 13a that is floatingly supported on the inner surface of the lid plate T across the entire circumference on the radially inner side of the first annular seal means 12, and this. And a second seal ring 13b fixed to the seal receiving plate 14 so as to face each other. The outer end surface of the second seal ring 13b is in pressure contact with the second annular seal plate 13a so as to be capable of relative sliding. Incidentally, the inner peripheral surface of the seal ring 13b is also respectively provided at a tip portion (radially outer end portion) of a seal member 15 to be described later and a divided elastic seal body 24 at the outer peripheral portion of the rotor body Rm (disk-shaped end wall Re). Press contact so that relative sliding is possible.

  Further, the second sealing device S2 extends linearly over the entire axial length of the rotor body Rm, and is supported so as to be slidable in the radial direction at a portion sandwiched between adjacent transfer chambers C on the outer periphery of the rotor body Rm. And the sealing member 15 is urged radially outward of the rotor R so that the radially outer end of the sealing member 15 is connected to the inner peripheral surface of the drum portion Hd and the large-diameter through hole in the end wall. And an urging spring 16 as urging means for slidably contacting the Hdh.

  Each seal member 15 is formed in a rectangular cross section and extends in a straight line in the rotor axial direction, and has a transverse cross section so as to hold the base (rotor radial inner end) of the elastic seal body 15s. It is comprised from the seal holder 15m which consists of a rigid body formed in U shape. A support groove 17 formed so as to cross the axial direction is formed in each portion of the outer periphery of the rotor body Rm sandwiched between adjacent transfer chambers C, and a seal is formed in the support groove 17. The base portion (particularly, the seal holder 15m) of the member 15 is fitted and supported so as to be slidable in the radial direction and liquid-tight.

  The cover plate T is provided with a plurality of work windows Ta formed in a shape and size that allow a plurality of seal members 15 to be inserted into and removed from the support groove 17, and each of the work windows Ta is liquid-tight. The small lid 20 to be closed is detachably attached to the lid plate T with a bolt B2. The inner surface of the small lid 20 is joined to a sealing body 22 made of a flat rubber material that presses against the axial end surface of the seal member 15 so as to be relatively slidable and seals between the end surface and the lid plate T. . The seal body 22 may be brought into contact with the inner surface of the small lid 20 so as to be separable without being fixed.

  Thus, when the small lid 20 is removed, the seal member 15 can be easily inserted and removed from the support groove 17 through the work window Ta without removing the lid plate T from the rotor body Rm one by one. The maintenance work can be easily performed.

  An annular boss portion Reb is integrally projected on the outer peripheral portion of the disc-shaped end wall Re in the rotor body Rm, and a support hole 18 extending in the radial direction is formed in the boss portion Reb. . A support rod 19 detachably fixed (screwed in the illustrated example) to the base portion (seal holder 15m) of the seal member 15 is fitted and supported in the support hole 18 so as to be slidable in the radial direction. The biasing spring 16 is provided between the support rod 19 and the support bracket 21 which is detachably fixed to the outer surface of the disc-shaped end wall Re by a bolt B3 on the inner side in the radial direction from the portion. Due to the elastic biasing force of the spring 16, the front portion (radially outer end portion) of the seal member 15 is pressed against the inner peripheral surface of the drum portion Hd and the inner peripheral surface of the large-diameter through hole Hdh of the end wall so as to be slidable relative to each other. Is done.

  Further, as shown in FIGS. 8 and 9, a pair of the support grooves adjacent to each other in the circumferential direction is formed on the outer peripheral portion of the disc-shaped end wall Re (the outer peripheral portion of the boss portion Reb) of the rotor body Rm. 17 is formed with six notch grooves 25 having both ends open, and the series of notch grooves 25 allows the inner peripheral surface of the large-diameter through hole Hdh in the drum portion end wall and the outer peripheral surface of the disk-shaped end wall Re to be formed. Between the opposing surfaces, an annular seal gap 50 is provided which is divided into a plurality of arc-shaped gaps by a plurality of seal members 15 (especially seal bodies 15s). And in each arc-shaped space | gap (namely, notch groove 25), it is the 3rd which suppresses that a to-be-transferred object (sediment sand) leaks and moves to the 1st sealing device S1 side from the transfer chamber C through between the said opposing surfaces. A sealing device S3 is provided. In the illustrated example, the third seal device S3 includes an arc-shaped split elastic seal body 24 fitted in a compressed state in each arc-shaped gap (ie, the cutout groove 25), both ends of the seal body 24, and the seal member 15. And a pair of small seal pieces 24 'filling the gap between the two. In the illustrated example, the outer peripheral surfaces of the elastic seal bodies 24 and the small seal pieces 24 'are the inner peripheral surface of the second seal ring 13b of the first annular seal means 13 in the first seal device S or the large-diameter through hole Hdh. It is press-contacted to the inner peripheral surface of the slidably relative to the inner peripheral surface. As a result, the distance between the opposing surfaces of the outer peripheral surface of the disc-shaped end wall Re in the rotor body Rm (that is, the portion other than the portion corresponding to the seal member 15) and the inner peripheral surface of the large-diameter through hole Hdh is third. Since sealing is performed by the sealing device S3, leakage and movement of dredged sand from the transfer chamber C to the first sealing device S1 through the opposed surfaces can be effectively suppressed, and the sealing burden of the first sealing device S1 is correspondingly increased. As a result, the durability is improved.

  Thus, the small lid 20 is removed from the lid plate T, the work window Ta is opened, the support bracket 21 and the urging spring 16 are removed from the drum portion Hd, and the support rod 19 is attached to the seal member 15 (seal holder 15m). In a more separated state, the seal member 15 can be easily inserted and removed from the support groove 17 through the work window Ta, and maintenance work such as inspection and maintenance on the seal member 15 can be easily performed.

  On the entire inner surface of the concave groove Rma facing the transfer chamber C and the disk-shaped end wall Re of the rotor main body Rm, an object to be transferred (salt sand 1) falls from the transfer chamber C into the transport pipe P through the outlet O. At this time, as a peeling accelerating means for accelerating the peeling of the transfer object 1 from the inner surface of the transfer chamber C, ceramic processing or other surface treatment processing for reducing the friction coefficient is performed. Moreover, the inner surface of the concave groove portion Rma is formed as a smooth concave curved surface as shown in FIG. 5 so that corner portions (edge-shaped concave surfaces) that are likely to accumulate earth and sand are not formed. This concave curved surface also constitutes the peeling promoting means. Although not shown, the boundary portion between the inner surface of the concave groove portion Rma and the disc-shaped end wall Re is also smoothly connected by a rounded surface (arc surface) as the separation promoting means. As a result, during the operation of the quantitative supply device SS, the object to be transferred (the dredged sand 1) in each transfer chamber C can be peeled off from the inner surface of the transfer chamber C without any difficulty. The object to be transferred can be smoothly dropped and moved from the transfer chamber C through the outlet O of the drum portion Hd into the sediment discharge pipe 6 (and hence the transport pipe P), and the sediment discharge pipe 6 (and thus the transport pipe P). A certain amount of dredged soil and sand can be supplied reliably.

  In the earth and sand discharge pipe 6, compressed air mixed into the earth and sand can be continuously mixed with compressed air for pressure-feeding the earth and sand 1 supplied into the transport pipe P by the quantitative supply device SS. The device SA is connected. This compressed air mixing device SA passes through a compressor 2 installed at an appropriate location near the transport pipe P (on the pumping work ship BA in the illustrated example), and an air pipe 7 with an open / close valve 7v on the discharge side of the compressor 2. The nozzle pipe 8 communicates with the earth and sand discharge pipe 6 in a liquid-tight manner through the wall of the sediment discharge pipe 6 and opens into the pipe. From there, the compressed air can be introduced into the transport pipe P.

  Thus, the fixed amount supply device SS and the compressed air mixing device SA constitute a sediment transport device for supplying the dredged soil 1 and the compressed air to the upstream end of the transport pipe P. In the pneumatic transfer system using such a sediment transporter, when the dredged soil is sufficiently charged into the hopper 2 and the motor M of the quantitative supply device SS and the compressor 2 of the compressed air mixing device SA are respectively operated, At the same time, a fixed amount of dredged sand is supplied to the upstream end of the transport pipe P from the quantitative supply device SS. At the same time, compressed air is jetted out from the nozzle pipe 8 and mixed into the dredged sand. Sediment 1 can be efficiently transferred in large quantities.

  Next, the operation of the embodiment will be described. The dredged soil 1 including water collected at a dredging work site (not shown) (that is, an object to be transported) is stored in the earth transport ship BB and transferred to the water near the landfill U that is the final disposal site. In the water area, a mud working ship BA is waiting, and a transport pipe P is installed in advance from the working ship BA to the landfill U.

  Therefore, after laying the earth transport ship B on the mud work ship BA, the stored earth and sand 1 in the earth transport ship BB is scraped out by the earth and sand take-out device SH and put into the hopper HO. The operation of the motor M of the device SS and the compressor 2 of the compressed air mixing device SA is started. As a result, the dredged soil 1 in the hopper HO is continuously pushed into the transport pipe P by the constant amount supply device SS through the sediment discharge pipe 6 and at the same time, the compressed air from the compressor 2 is compressed into the air pipe 7 and the sediment discharge pipe. 6 is mixed into the dredged sand 1 near the upstream end of the transport pipe P, whereby the dredged sand 1 can be efficiently transferred to the landfill U through the transport pipe P efficiently.

  In this case, in the quantitative supply device SS, large-diameter through holes Hdh having an inner diameter substantially equal to the outer diameter of the rotor main body Rm are formed in both end walls of the cylindrical drum portion Hd in the housing H, respectively. A pair of disk-shaped end walls Re that close both axial ends of the plurality of concave grooves Rma on the outer peripheral surface thereof are integrally provided, and both ends of the rotor shaft RJ have a larger diameter than the pair of disk-shaped end walls Re. It protrudes outward through the through hole Hdh, and is rotatably supported on the installation surface B independently of the housing H. Thus, the bearing support function for the rotor R is removed from the housing H (drum portion Hd), and the support of the housing and the rotor is made independent on the installation surface B, thereby providing a hopper HO that forms the main body of the quantitative supply device SS. The structure of the housing H can be greatly simplified and reduced in size and weight.

  In addition, the relative rotation between the inner peripheral portion of the large-diameter through hole Hdh provided at both ends of the drum portion Hd and the corresponding disk-shaped end wall Re outer peripheral portion of the rotor body Rm. And between the portion of the outer peripheral portion of the rotor main body Rm sandwiched between adjacent transfer chambers C and the inner peripheral surface of the drum portion Hd, with the first sealing device S1 that allows misalignment. However, since the sealing is performed over the entire axial length of the rotor body Rm with the second sealing device S2 that allows relative rotation and misalignment of the two, there is some misalignment between the drum portion Hd and the rotor R. In addition, a necessary sealing region between the rotor R and the drum portion Hd can be accurately sealed, and stable quantitative supply of dredged soil can be performed over a long period of time. Moreover, since the seal region can be made relatively narrow, the seal structure can be simplified as much as possible, and the sliding resistance from the seal portion acting on the rotor R can be reduced as much as possible. Since the drum structure Hd and the rotor R have a seal structure that allows a slight misalignment between the drum portion Hd and the rotor R, the manufacturing accuracy and assembly accuracy of each part of the device are specially increased to prevent misalignment as in the conventional device. This eliminates the need to do so and saves costs.

  Further, as shown in the figure, the first seal device S1 is detachably fixed to the disc-shaped end wall Re of the rotor R, and covers the periphery of the large-diameter through hole Hdh of the drum portion Hd with a gap therebetween. And the at least one pair of annular sealing means 12 and 13 which are provided between the cover plate T and the drum plate Hd and are slidably contacted with each other so as to be slidable therebetween. Even if a slight misalignment occurs between the rotor R and the rotor R, the disc-shaped end wall Re of the rotor R and the end wall of the drum portion Hd can be accurately sealed with a simple structure. By removing, maintenance work such as inspection and maintenance for the first seal device S1 can be easily performed.

  Further, as shown in the illustrated example, the second sealing device S2 extends in a radial direction at a portion extending linearly over the entire axial length of the rotor body Rm and sandwiched between adjacent transfer chambers C on the outer periphery of the rotor body Rm. A seal member 15 slidably and liquid-tightly fitted and supported, and the seal member 15 is urged outward in the radial direction of the rotor so that the radially outer end of the seal member 15 is the inner peripheral surface of the drum portion. The urging means for slidably press-contacting to the rotor is provided, so that even if a slight misalignment occurs between the drum part and the rotor, the structure between the outer peripheral part of the rotor R and the inner peripheral surface of the drum part Hd can be accurately determined with a simple structure. In addition, even if the tip of the sealing material 15 (that is, the contact surface with the drum portion Hd) is worn slightly by use, sufficient sealing performance can be maintained over a long period of time.

  14 and 15 show a modification of the third sealing device S3. In this modification, a plurality of seal members 15 (especially seal bodies 15s) are provided between opposing surfaces of the inner peripheral surface of the large-diameter through hole Hdh in the drum portion end wall and the outer peripheral surface of the disc-shaped end wall Re. A relatively wide annular seal gap 50 is provided which is divided into a plurality of arcuate gaps 25 in the axial direction. The third sealing device S3 that suppresses leakage and movement of the transfer object (sediment sand) from the transfer chamber C to the first sealing device S1 side through the opposed surfaces is compressed in each arcuate gap 25. An arc-shaped split elastic seal body 24 to be fitted, a pair of small seal pieces 24 ′ that fills the gap between both ends of the seal body 24 and the seal member 15, and an uneven engagement with the back surface of the elastic seal body 24. And a back metal 52 that is detachably secured to the outer peripheral surface of the end wall of the rotor body Re by a bolt B7. In the illustrated example, the outer peripheral surfaces of the respective elastic seal bodies 24 and small seal pieces 24 ′ are formed on the inner peripheral surface of the second seal ring 13 b of the first annular seal means 13 and the large-diameter through hole Hdh in the first seal device S. The inner surface is pressed against the inner surface so as to be slidable. As a result, the distance between the opposing surfaces of the outer peripheral surface of the disc-shaped end wall Re in the rotor body Rm (that is, the portion other than the portion corresponding to the seal member 15) and the inner peripheral surface of the large-diameter through hole Hdh is third. Since sealing is performed by the sealing device S3, leakage and movement of dredged sand from the transfer chamber C to the first sealing device S1 through the opposed surfaces can be effectively suppressed, and the sealing burden of the first sealing device S1 is correspondingly increased. As a result, the durability is improved.

  By the way, in the earth and sand transport system which connected the hopper HO, the fixed amount supply apparatus SS as the earth and sand pushing apparatus, and the transport pipe P like a present Example, from the fixed quantity supply apparatus SS of the dredged soil 1 which is a to-be-transferred object. If the indentation flow rate into the transport pipe P (and hence the sediment flow rate in the transport pipe P) can be accurately grasped, the flow rate data can be used for various process management in the system. This is useful for efficiently and accurately adjusting work setup, work speed, and the amount of compressed air supplied from the compressed air mixing device SA to the transport pipe P.

  Therefore, in this embodiment, the information on the amount of sediment stored corresponding to the sediment storage height in the hopper HO is obtained in advance in the height region of at least a part of the hopper HO (substantially the entire hopper body 100) and stored in the personal computer PC. In addition, during operation of the quantitative supply device SS as the earth and sand pushing device, the ultrasonic level sensor SE measures the earth and sand storage height of the hopper body 100, and the personal computer PC based on the measured value and the stored information. The sediment storage amount V in the hopper HO is estimated, and a flow rate calculation execution section Lm in which the estimated sediment storage amount V is steadily and stably reduced is extracted. The sediment flow rate Q is derived from the decreasing slope, and the sediment flow rate Q is displayed on the monitor of the personal computer PC and its history is stored in the storage means. That. Workers at the site can effectively use the sediment flow rate Q for the above-mentioned various process management at the work site by looking at the display on the monitor, and can be reduced without using an electromagnetic flow meter as in the past. The sediment flow rate can be measured accurately at a low cost.

  As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.

  For example, in the above-described embodiment, the rotary type quantitative supply device SS is used as the quantitative supply device as the earth and sand pushing device, but the earth and sand pushing device of the present invention is not limited to the rotary type, and at least in the hopper. As long as it is an apparatus having a structure capable of continuously and forcibly pushing the stored soil into the transport pipe P, the type and structure are not limited.

  In the above embodiment, the calculation means, the storage means, and the filter means are exemplified by using a personal computer PC incorporating a control circuit or a program capable of executing these functions. However, the present invention achieves the same function. A dedicated arithmetic processing unit (computer) may be used.

  In the above embodiment, the reference level (zero point) of the sediment storage height h is set at the lowermost position of the hopper body 100. However, in the present invention, the reference level (zero point) of the sediment storage height is set. For example, it may be set at the bottom of the hopper base 101 or at the middle in the vertical direction of the base 101.

  In the above embodiment, the output cycle (cycle) of the detection signal from the ultrasonic level sensor SE is set to 0.5 seconds, and the cycle output value is five times (= 2.5 seconds) to equalize the cycle output value. The moving average value hf of the value is calculated and the measured value of the sediment storage height h is shown. Further, for the time change rate dV of the sediment storage amount V, its output cycle (cycle) is 0.5 seconds, Moreover, although what calculated the moving average value dVf of the cycle output value of 5 times (= 2.5 second) in order to equalize the cycle output value was used for the sediment input judgment, these numerical values are For example, in the present invention, the above numerical values can be appropriately set according to the purpose of flow measurement and the target accuracy.

  In the above-described embodiment, the time when the time change rate dV of the sediment storage amount V exceeds the threshold value α is set as the sediment input time point. However, in the present invention, the start point of the sudden rise of the sediment storage amount V, Alternatively, the end point of rising (peak time) may be set as the earth and sand input time point.

  Moreover, in the said Example, the estimated value of the sediment storage amount is calculated | required based on the measured value of the sediment storage height, and the memory | storage information which matched the sediment storage height and the sediment storage amount beforehand, and the sediment storage amount is steady. The flow rate calculation execution section Lm that is decreasing (ie, stable) is extracted, and the sediment flow rate Q is calculated based on the decrease gradient with respect to the temporal change of the sediment storage amount in the section Lm. However, in the present invention (Claims 1 and 7), a flow rate calculation execution section in which the measured value of the sediment storage height is steadily (ie, stably) decreased is extracted, and the sediment storage height in the section is extracted. The sediment flow rate Q may be calculated based on the decreasing gradient with respect to the time change and the stored information in which the sediment storage height and the sediment storage amount are associated in advance.

  In the above embodiment, the most part of the transport pipe P after the height is suspended on the surface of the water and laid down to the landfill U as a sediment disposal site. In the present invention, a part of the transport pipe P or All may be laid on the ground.

  Moreover, in the said Example, fixed_quantity | feed_rate supply apparatus SS is utilized for the wind-power transfer of the slurry-like earth and sand (sediment sand) by the transport pipe P between the mud working ship A and the landfill U as a sediment disposal site. However, the fixed amount supply device as the earth and sand pushing device is not limited to the examples of the starting place and the arrival place of the slurry-like earth and sand of the object to be transferred, and can also be applied to a transfer system not using wind power.

  Moreover, in the said Example, although what showed the outlet O of fixed_quantity | feed_rate supply apparatus SS (housing H) connected to the transport pipe P via the earth and sand discharge pipe 6, the outlet O was directly connected to the transport pipe P in this invention. You may make it connect.

  Moreover, in the said Example, although what compressed the compressed air from compressed air mixing apparatus SA to the earth-and-sand discharge pipe 6 in front of the transport pipe P was shown, in this invention, the compressed air is conveyed to the transport pipe P. You may make it inject directly.

1 is an overall longitudinal sectional view showing an outline of a pneumatic transfer system for dredged sand according to one embodiment of the present invention. Front view showing the main part of the fixed-quantity supply device (part 2 arrow enlarged view of FIG. 1) Top view of the hopper (viewed in the direction of arrow 3 in FIG. 2) Sectional view along line 4-4 in FIG. Sectional view along line 5-5 in FIG. 6-6 enlarged sectional view of FIG. Fig. 7 arrow 7 enlarged view Enlarged view of arrow 8 in FIG. Sectional view taken along line 9-9 in FIG. Sectional view taken along line 10-10 in FIG. An example of a map showing the relationship between sediment storage height and sediment storage in the hopper body Timing chart showing an example of temporal change in sediment storage height in the hopper body Flow chart showing an example of calculation processing of sediment flow rate FIG. 8 is a view corresponding to FIG. 8 showing a modification of the third sealing device. FIG. 9 is a view corresponding to FIG. 9 showing a modification of the third sealing device.

HO ... Hopper V ... Sediment storage height P ... Transport pipe PC ... Computer SE as computing means, storage means, filter means ... Ultrasonic level sensor as height sensor SS ... Quantitative supply device as earth and sand pushing device

Claims (6)

A hopper (HO) in which slurry-like earth and sand can be input at any time and can store the input earth and sand, and a transport pipe (P) for transporting the earth and sand to a predetermined place away from the hopper (HO) And a sediment flow rate measuring method in a sediment transport system including a sediment transport device (SS) for taking in the stored sediment in the hopper (HO) from the bottom of the hopper (HO) and forcibly pushing it into the transport pipe (P),
A height sensor (SE) for detecting the sediment storage height in the hopper (HO) is provided in the hopper (HO), and information on the amount of sediment stored in the hopper (HO) corresponding to the sediment storage height is obtained. (HO) is obtained in advance in at least a part of the height region,
During the operation of the earth and sand pushing device (SS), the height sensor (SE) measures the earth and sand storage height, and the estimated value of the earth and sand storage amount (V) in the hopper (HO) from the measured value and the information. The flow rate calculation execution section (Lm) in which the estimated value is steadily decreasing is extracted from the time change of the estimated value, and the decreasing gradient with respect to the time change of the estimated value in the flow rate calculation execution section (Lm) based on, characterized by calculating the flow rate (Q) of the sediment to be pushed into the transport pipe (P) from the soil pressing device (SS), sediment flow measuring how the sediment transport system. In the case where a change pattern in which the estimated value suddenly rises immediately after the earth and sand is introduced and then gradually decreases due to intermittent earth and sand thrown into the hopper (HO) is repeated, The flow rate calculation execution section (Lm) when the period between the earth and sand is shorter than the predetermined time (T) starts from the time when the first set time (t1) has elapsed from the time when the earth and sand is thrown in the previous time, also from this sediment turned point, the first set time (t1), characterized in that the end point when going back for a second set time (t2) shorter than, sediment transport system of claim 1, wherein Of sediment flow measurement in Japan. In the case where a change pattern in which the estimated value suddenly rises immediately after the earth and sand is introduced and then gradually decreases due to intermittent earth and sand thrown into the hopper (HO) is repeated, The flow rate calculation execution section (Lm) when the period between the time and the time when the earth and sand are charged exceeds a predetermined time (T), and a measured flow rate update point is determined every time the predetermined time (T) elapses. The starting point is the time when the first set time (t1) has elapsed from the time when the previous sediment flow or the previous measured flow rate update point, and the first measured time from the current measured flow rate update point or the current sediment input point. The sediment flow rate measuring method in the sediment transport system according to claim 1 or 2 , characterized in that the end point is the time set back by a second set time (t2) shorter than the set time (t1). The height sensor (SE) intermittently outputs a detection signal corresponding to the sediment storage height in a predetermined detection cycle,
The moving average value of a predetermined number of cycle output values is obtained by a filter means (PC) to equalize the cycle output value, and the moving average value is used as the measured value. The sediment flow measurement method in the sediment transport system according to any one of the above. Computation means (PC) for computing the time change rate (dV) of the amount of sediment stored in the hopper (HO) in a predetermined computation cycle from the measurement value and the information, and to equalize the cycle computation value, The moving average value (dVf) of the cycle calculation values for a predetermined number of times is obtained by the filter means (PC), and it is determined whether or not soil has been thrown in based on whether or not the obtained moving average value (dVf) exceeds the predetermined value (α). The method for measuring sediment flow rate in the sediment transport system according to any one of claims 1 to 4 , wherein: A hopper (HO) in which slurry-like earth and sand can be input at any time and can store the input earth and sand, and a transport pipe (P) for transporting the earth and sand to a predetermined place away from the hopper (HO) And a sediment flow rate measuring device in a sediment transport system comprising a sediment pushing device (SS) for taking in the stored sediment in the hopper (HO) from the bottom of the hopper (HO) and forcibly pushing it into the transport pipe (P),
A height sensor (SE) attached to the hopper (HO) to detect the sediment storage height in the hopper (HO);
Storage means (PC) for storing information on the amount of sediment stored in the hopper (HO) corresponding to the sediment storage height obtained in advance in at least a partial height region of the hopper (HO);
Wherein during operation of soil pressing device (SS), and a pre-Symbol rate calculation means for calculating the flow rate (Q) of the soil is pushed sediment pressing device from (SS) to the transport pipe (P) (PC),
The flow rate calculation means (PC) stores the sediment in the hopper (HO) from the measured value of the sediment storage height detected by the height sensor (SE) and the information during the operation of the sediment pushing device (SS). An estimated value of the quantity is obtained, a flow rate calculation execution section (Lm) in which the estimated value is steadily decreasing is extracted from the time change of the estimate value, and the time of the estimated value in the flow rate calculation execution section (Lm) characterized by calculating the sediment flow (Q) from decreasing slope with respect to changes, sediment flow measurement equipment in sediment transport system.

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