Send out management methods

Abstract

Accurately manage the actual transmission speed and transmission volume. [Solution] A method for managing the discharge of a cement composition using a pump truck equipped with a cylinder and piston for dispensing the cement composition, wherein the reciprocating motion of the piston in the cylinder is detected by a sensor, and the discharge speed or discharge amount of the cement composition actually discharged from the pump truck is determined based on the detection result of the sensor, the capacity of the cylinder, and a correction value corresponding to the slump of the cement composition.

Description

[Technical Field]

[0001] The present invention relates to a method for managing the delivery of cement compositions. [Background technology]

[0002] A known method for placing concrete (an example of a cement composition) involves using a pump truck equipped with a cylinder and a piston. In this method, the concrete filled in the pump truck's cylinder is pushed out of the cylinder by moving the piston with the driving force generated by the pump. The concrete pushed out of the cylinder is then delivered to the placement site through a supply pipe. Furthermore, for example, Patent Document 1 discloses a system in which sensors are placed along the pumping path of the pump truck, and the pumping performance of the concrete is evaluated using these sensors. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2017-9596 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] Even with the systems described above, there was a risk that the actual delivery speed and volume of concrete from the pump truck could not be accurately controlled.

[0005] This invention has been made in view of the above problems, and aims to accurately control the actual discharge speed and discharge amount, taking into consideration that the degree to which concrete flows into the cylinder differs depending on the hardness (fresh condition) of the concrete. [Means for solving the problem]

[0006] The main invention for achieving the above objective is a method for managing the discharge of a cement composition when using a pump truck equipped with a cylinder and piston for dispensing the cement composition, characterized in that the reciprocating motion of the piston in the cylinder is detected by a sensor, the discharge speed or discharge amount of the cement composition actually discharged from the pump truck is determined based on the detection result of the sensor, the capacity of the cylinder, and a correction value corresponding to the slump of the cement composition, the cement composition is poured into the inside of the steel pipe of the CFT column, the pouring height is determined by dividing the discharge amount by the cross-sectional area of ​​the steel pipe at the cement composition pouring site, and the cement composition is filled without placing excessive stress on the steel pipe. Other features of the present invention will be made clearer by description in this specification and the accompanying drawings. [Effects of the Invention]

[0007] According to the present invention, the actual discharge speed and discharge amount can be accurately controlled. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram illustrating a concrete construction method. [Figure 2] This is an explanatory diagram of a double-cylinder type reciprocating pump. [Figure 3] Figures 3A to 3C show the measurement data from the acceleration sensor 30. Figure 3A shows the data when the pumping speed is 30 m³ / h. Figure 3B shows the data when the pumping speed is 53 m³ / h. Figure 3C shows the data when the pumping speed is 70 m³ / h. [Figure 4] This is a flowchart showing an example of a concrete delivery management method in this embodiment. [Figure 5] This flowchart shows another example of the concrete delivery management method in this embodiment. [Modes for carrying out the invention]

[0009] The following matters at least will become clear from the description of this specification and the attached drawings.

[0010] A delivery management method for delivering the cement composition using a pump truck equipped with a cylinder and a piston for delivering the cement composition, wherein the reciprocating motion of the piston in the cylinder is detected by a sensor, and based on the detection result of the sensor, the capacity of the cylinder, and a correction value corresponding to the slump of the cement composition, a delivery rate or a delivery amount of the cement composition actually delivered from the pump truck is obtained. A delivery management method characterized by this is clear.

[0011] According to such a delivery management method, the delivery rate and the delivery amount of the cement composition actually delivered from the pump truck can be accurately managed.

[0012] It is desirable that in such a delivery management method, the reciprocating speed of the piston is detected by the sensor, and the delivery rate is obtained based on the reciprocating speed, the capacity of the cylinder, and the correction value.

[0013] According to such a delivery management method, the delivery rate of the cement composition delivered from the pump truck can be accurately obtained.

[0014] It is also possible that in such a delivery management method, the time required for one stroke of the piston is detected by the sensor, and the delivery rate is obtained based on the required time, the capacity of the cylinder, and the correction value.

[0015] According to such a delivery management method, the delivery amount of the cement composition delivered from the pump truck can be accurately obtained.

[0016] It is desirable that in such a delivery management method, the delivery rate is divided by the cross-sectional area of the placement site of the cement composition to obtain the placement height rate.

[0017] According to such a delivery management method, the placement height speed (the amount of change in the placement height per unit time) can be managed in real time, and it is possible to prevent an excessive stress load from occurring on the formwork or the like.

[0018] Regarding such a delivery management method, it is desirable to obtain the delivery amount based on the number of reciprocations of the piston detected by the sensor, the cumulative number of reciprocations, the capacity of the cylinder, and the correction value.

[0019] According to such a delivery management method, the delivery amount of the cement composition delivered from the pump truck can be accurately obtained.

[0020] Regarding such a delivery management method, it is desirable to obtain the placement height by dividing the delivery amount by the cross-sectional area of the placement part of the cement composition.

[0021] According to such a delivery management method, the placement height can be managed in real time, and equipment and personnel for measuring the placement height are no longer required.

[0022] Regarding such a delivery management method, it is desirable that the cement composition be placed inside the steel pipe of the CFT column.

[0023] According to such a delivery management method, the placement height and placement height speed of concrete into the steel pipe of the CFT column can be easily managed.

[0024] Regarding such a delivery management method, the sensor may be one that detects the vibration of the pump truck due to the reciprocating motion of the piston.

[0025] According to such a delivery management method, the reciprocating motion of the piston can be detected by the vibration of the pump truck.

[0026] Regarding such a delivery management method, the sensor may be one that detects the sound generated along with the reciprocating motion of the piston.

[0027] With this type of transmission management method, the reciprocating motion of the piston can be detected by a sound sensor (sound sensor).

[0028] In such a discharge management method, the sensor may detect the stroke end of the piston in the cylinder.

[0029] With this type of discharge management method, the reciprocating motion of the piston can be detected by a sensor that senses the end of the piston's stroke.

[0030] ===Execution=== <Regarding concrete construction> Figure 1 is a schematic diagram illustrating an example of a concrete construction method. This diagram shows the process of pouring concrete into the steel pipe 2 of a concrete-filled steel pipe structural column 1 (hereinafter also referred to as CFT column 1) at a construction site.

[0031] A concrete mixer truck 10 and a concrete pump truck 20 are positioned near steel pipe 2.

[0032] The ready-mix concrete truck 10, also known as a mixer truck or agitator truck, is a vehicle that transports concrete materials received from a concrete manufacturing plant to the concrete pouring site while mixing them. The ready-mix concrete truck 10 is equipped with a drum 12 and a chute 14.

[0033] The drum 12 is a roughly cylindrical container for loading ready-mix concrete (hereinafter also simply referred to as concrete). The drum 12 rotates continuously while the ready-mix concrete truck 10 is in motion, mixing the concrete materials. This prevents the separation of aggregates and water, keeping the concrete homogeneous.

[0034] The chute 14 is a component for guiding (discharging) the concrete inside the drum 12 to the desired unloading position (in this embodiment, the hopper 21 of the pump truck 20), and is provided at an inclined angle at the rear of the drum 12.

[0035] The pump truck 20 is a vehicle used to pump concrete, which has been transported to the site by the ready-mix concrete truck 10, to the pouring location (steel pipe 2 in this embodiment). The pump truck 20 is equipped with a hopper 21, a pump 22, and a concrete supply pipe 29.

[0036] The hopper 21 is located at the rear of the pump truck 20 and is positioned opposite the chute 14 of the concrete mixer truck 10. The hopper 21 receives the concrete discharged from the chute 14 of the concrete mixer truck 10.

[0037] Pump 22 pumps the concrete supplied to the hopper 21 into the concrete supply pipe 29 under high pressure. Pump 22 in this embodiment is a double-cylinder reciprocating pump. Pump 22 will be described later. The concrete supply pipe 29 is a tubular member that sends (dispenses) concrete to the pouring location (steel pipe 2 in this embodiment), such as a formwork.

[0038] The steel pipe 2 is a hollow member with a square or round cross-section, and the CFT column 1 is formed by filling the inside of the steel pipe 2 (corresponding to the area where the cement composition is poured) with concrete. In the construction of such a CFT column 1, it is important to fill the concrete without placing excessive stress on the steel pipe 2.

[0039] A pressure inlet 2a is formed at the bottom of the steel pipe 2, and the concrete supply pipe 29 of the pump truck 20 is connected to the pressure inlet 2a.

[0040] Concrete, transferred from the chute 14 of the ready-mix concrete truck 10 to the hopper 21 of the pump truck 20, is continuously delivered through the concrete supply pipe 29 to the pressure inlet 2a of the steel pipe 2 by the drive of the pump 22, and poured into the steel pipe 2. This forms the CFT column 1.

[0041] Figure 2 is an explanatory diagram showing an example of a double-cylinder type reciprocating pump. As shown in Figure 2, the double-cylinder type pump 22 has a pair of concrete cylinders 23 connected to one side of the hopper 21.

[0042] Each of the pair of concrete cylinders 23 is equipped with a concrete piston 24. The concrete piston 24 moves back and forth by a hydraulic cylinder 25 located behind it.

[0043] Furthermore, a swing pipe 26 is provided on the other side of the hopper 21, with one end of the swing pipe 26 being pivotably connected, and a concrete supply pipe 29 is connected to this swing pipe 26.

[0044] The piston rod 28 of the pipe drive cylinder 27 is connected to the swing pipe 26, and when the pipe drive cylinder 27 is driven, the piston rod 28 moves back and forth, causing the swing pipe 26 to swing within the hopper 21.

[0045] The other end of the swing pipe 26 is slidably in contact with one side of the hopper 21, and as the swing pipe 26 is swung within the hopper 21 by the pipe drive cylinder 27, the opening at the other end of the swing pipe 26 is selectively connected to the openings of a pair of concrete cylinders 23.

[0046] The concrete pistons 24 of the pair of concrete cylinders 23 are driven in opposite directions. The swing pipe 26 is also oscillated in conjunction with the movement of the concrete pistons 24. In other words, when the concrete piston 24 of one concrete cylinder 23 is pushed out by the hydraulic cylinder 25, the swing pipe 26 is connected to that concrete cylinder 23. As a result, the concrete (fresh concrete) that had been drawn into one of the concrete cylinders 23 is pushed into the swing pipe 26.

[0047] At the same time, in the other concrete cylinder 23, the concrete piston 24 is retracted by the hydraulic cylinder 25. As a result, the concrete (fresh concrete) from the hopper 21 is drawn into the concrete cylinder 23.

[0048] Subsequently, when concrete is pushed out from one concrete cylinder 23 into the swing pipe 26, the swing pipe 26 is swung by the pipe drive cylinder 27 and connected to the other concrete cylinder 23 into which the concrete was drawn.

[0049] As the above operations are repeated, the concrete in the hopper 21 is sent to the steel pipe 2 via the swing pipe 26 and the concrete supply pipe 29.

[0050] Furthermore, in this embodiment, as shown in Figure 2, an acceleration sensor 30 is provided at the bottom of the hopper 21. The acceleration sensor 30 detects vibrations (pulsations of the pump 22) that occur in conjunction with the reciprocating motion (stroke) of the concrete piston 24 of the concrete cylinder 23.

[0051] The output of the acceleration sensor 30 is transmitted via wireless or other communication means to a terminal device (not shown), such as a personal computer (PC) or tablet terminal. The terminal device includes a storage unit for storing data and programs, a calculation unit for performing various calculations based on the program, a display unit for displaying measurement data (waveforms, etc.), and a warning generation unit for generating warnings with sound, light, etc. The terminal device also manages the measured data.

[0052] Figures 3A and 3C show examples of measurement data from the acceleration sensor 30. Figure 3A shows a pumping speed of 30 m 3 In the case of / h, Figure 3B shows a pumping speed of 53m 3 In the case of / h, Figure 3C shows a pumping speed of 70m 3 The figures show the case for / h. The horizontal axis of each figure is time (s), and the vertical axis is acceleration (m / s²). 2The pumping speed is set by the pump truck 20.

[0053] In each figure (Figures 3A to 3C), the portion where the terminal device detected a peak in the waveform is circled. The method for reading the number of strokes and stroke time from the output (waveform) of the acceleration sensor 30 is not particularly limited; it may be done by waveform analysis or by AI learning.

[0054] As shown in the figure, there is a correlation between the number of strokes and the pumping speed. For example, at a pumping speed of 30 m / s 3 At / h, the stroke rate is 10 times / min and the pumping speed is 53m 3 At / h, the stroke rate is 16 times / min, and the pumping speed is 70m 3 At a pumping speed of / h, the stroke rate is 22 strokes / min, and the number of strokes increases as the pumping speed increases. Also, the amplitude of the waveform increases as the pumping speed increases.

[0055] In this embodiment, concrete is pumped alternately from a pair of concrete cylinders 23. Therefore, the multiple pulsations in each figure consist of alternating strokes from one concrete cylinder 23 and strokes from the other concrete cylinder 23. For example, of the 10 strokes in Figure 3A, 5 strokes (e.g., odd-numbered strokes) are from one concrete cylinder 23, and the other 5 strokes (e.g., even-numbered strokes) are from the other concrete cylinder 23.

[0056] In this way, by providing the acceleration sensor 30, the number of strokes associated with concrete pumping can be accurately determined regardless of the pumping speed.

[0057] Furthermore, the fluidity of concrete decreases over time after it is manufactured. When the fluidity of concrete decreases, it becomes more difficult for it to be drawn into (fill) the concrete cylinder 23, resulting in a smaller flow rate of concrete into the concrete cylinder 23. In this case, less concrete is pushed out of the concrete cylinder 23, and for example, the concrete cannot be delivered at the speed (pumping speed) set by the pump truck 20.

[0058] Therefore, in this embodiment, as will be described later, concrete delivery is controlled using an efficiency (corresponding to a correction value) that corresponds to the fluidity (slump) of the concrete.

[0059] <Regarding concrete delivery management methods> Figure 4 is a flowchart showing an example of a concrete delivery management method in this embodiment. Here, we will explain the case where the concrete pouring height (corresponding to the pouring height) of the CFT column 1 into the steel pipe 2 is managed. Note that the terminal device is the main component of the following operations.

[0060] First, the number of strokes of the concrete cylinder 23 (the number of reciprocating movements of the concrete piston 24) is counted from the output of the acceleration sensor 30 (output waveform: see Figure 3) (S101). That is, the appearance of peaks in the acceleration waveform, as shown in Figures 3A to 3C, is detected and the number of peaks is counted. In this way, the strokes of each of the pair of concrete cylinders 23 are counted together.

[0061] Next, the actual discharge amount is calculated by multiplying the cumulative number of strokes by the cylinder capacity and the efficiency (corresponding to the correction value) (S102). Here, the cylinder capacity is the capacity of one concrete cylinder 23 (one of a pair of concrete cylinders 23).

[0062] Also, efficiency is the ratio of the actual delivery volume to the theoretical delivery volume (the degree of concrete inflow inside the concrete cylinder 23). That is, when the fluidity of the concrete is small, it becomes difficult to fill the concrete cylinder 23 with concrete, so the actual delivery volume from the concrete cylinder 23 is smaller than the theoretical delivery volume. Efficiency is used to correct this. Specifically, if the theoretical delivery volume is Qa (m 3 / h), the actual delivery volume is Qb (m 3 / h), and the efficiency is η, then Qa = Qb / η That is, η = Qb / Qa is obtained. Note that the efficiency η is determined according to the type of concrete and the slump (fluidity).

[0063] Table 1 shows an example of efficiency.

[0064]

Table 1

[0065] In this embodiment, a table associating the slump and efficiency as shown in Table 1 is stored in the storage unit of the terminal device. And, for example, when the result of the slump test is input, the efficiency corresponding to that result is selected and used for the calculation in step S102 (here, the calculation of the delivery volume). Note that the relationship between the slump and the efficiency is not limited to Table 1, and numerical values based on actual performance (numerical values other than those in Table 1) may be used. Also, when the slump can be detected in real time, the detection result may be input at any time.

[0066] Next, the delivery volume calculated in step S102 is divided by the cross-sectional area of the steel pipe 2 (specifically, the cross-sectional area of the concrete placement part) (S103). Thereby, the driving height (placement height) of the concrete in the steel pipe 2 can be obtained.

[0067] Next, a determination is made (S104) based on the calculated driving height to determine whether the driving is complete or not. If it is determined that the driving is not complete (NO in S104), the process returns to step S101. If it is determined that the driving is complete (YES in S104), the driving is completed.

[0068] In this way, the amount of concrete actually delivered from the pump truck 20 can be calculated by using the cumulative number of strokes of the concrete cylinder 23 counted by the acceleration sensor 30, the cylinder capacity, and the efficiency. Furthermore, the pouring height can be determined from this delivered amount.

[0069] Figure 5 is a flowchart of another example of the concrete placement management method in this embodiment. Here, we will explain the case where the concrete placement height rate (corresponding to placement height rate) is managed. Placement height rate is the amount of change in placement height per unit time, and is the height that rises due to the concrete placed per unit time. In this case as well, the main operator is the terminal device. Furthermore, the placement height management shown in Figure 4 may also be performed simultaneously.

[0070] First, similar to step S101 in Figure 4, the number of strokes of the concrete cylinder 23 (the number of reciprocating movements of the concrete piston 24) is counted from the output of the acceleration sensor 30 (output waveform: see Figure 3) (S201). Here again, the strokes of the pair of concrete cylinders 23 are counted together.

[0071] Next, the actual discharge speed (discharge amount per unit time) is calculated by multiplying the number of strokes per unit time by the cylinder capacity and efficiency (S202). The number of strokes per unit time (corresponding to the reciprocating speed of the piston) is the number of strokes detected per unit time (for example, 1 minute), which is 10 in the case of Figure 3A. The cylinder capacity and efficiency are the same as in step S102 of Figure 4, so their explanation is omitted.

[0072] Next, the delivery speed calculated in step S202 is divided by the cross-sectional area of ​​the steel pipe 2 (specifically, the cross-sectional area of ​​the concrete pouring area) to determine the concrete pouring height speed in the steel pipe 2 (S203).

[0073] Next, it is determined whether the calculated driving height speed is within a threshold (for example, 1 m / min) (S204). If the driving height speed exceeds the threshold (NO in S204), a warning is issued. If the driving height speed is within the threshold (YES in S204), it is determined whether the driving is complete (S205). If it is determined that the driving is not complete (NO in S205), the process returns to step S201. If it is determined that the driving is complete (YES in S205), the driving is completed.

[0074] In the example above, the number of strokes was counted, but as explained below, it is also possible to detect the time required for each stroke (1 stroke) and calculate the discharge rate (discharge rate per unit time) from that time.

[0075] The discharge rate (Q(m³)) per unit time (in this case, 1 hour) of pump truck 20 3 Vc (volume of concrete cylinder 23: m³) is the volume of concrete discharged from the concrete cylinder 23 in one pass. 3 This can be expressed as (strokes / hour) × the number of strokes of the concrete piston 24 per hour N (strokes / hour).

[0076] Therefore, the discharge rate Q can be calculated from the time Ts (sec) required for one stroke using equation (1). The efficiency η is the same as above, representing the degree of concrete flow into the concrete cylinder 23, and varies depending on the slump, decreasing as the slump decreases.

[0077] Q = 3600 × Vc × η / Ts ... (Equation 1) Here, Q: discharge volume (m³) 3 / h) Vc: Volume of concrete cylinder 23 (m³) 3) η: efficiency Ts: Duration of one stroke (sec) Thus, the discharge speed (discharge amount per unit time) can be determined by detecting the time required for one stroke.

[0078] As explained above, by using the acceleration sensor 30 to detect the stroke of the concrete cylinder 23 of the pump truck 20, it becomes possible to manage the delivery and placement of concrete in real time. This eliminates the need for equipment and personnel to measure the placement height, etc. Furthermore, in this embodiment, since the efficiency η is used to make corrections according to the fluidity (slump) of the concrete, the actual amount of concrete delivered from the pump truck 20 and the delivery speed can be accurately determined. In addition, it is possible to monitor whether there are any abnormalities in the pumping performance by observing the waveform of the acceleration sensor 30.

[0079] ===Other Examples=== The embodiments of the present invention have been described above, but these embodiments are intended to facilitate understanding of the present invention and are not intended to limit its interpretation. Furthermore, the present invention can be modified or improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. For example, the following modifications are possible.

[0080] In the above-described embodiment, the example given was the case where concrete is poured into the steel pipe 2 of the CFT column 1 using the press-in method, but it is not limited to this. For example, it may be poured using the drop-in method. It can also be applied when pouring concrete into formwork for columns other than CFT structures, or for walls, etc. In this case as well, if a warning is issued when the pouring height speed exceeds a controlled value (threshold), deformation and collapse of the formwork due to excessive lateral pressure can be prevented. Furthermore, by controlling the appropriate delivery speed, defects such as beading can be reduced, and quality can be improved.

[0081] Furthermore, it can also be applied, for example, to the concrete pouring method used for underground walls in the top-down construction method. In this case as well, the same effects as described above can be obtained. In the underground wall pouring method, since the inside of the formwork is not visible, more concrete than the planned amount is ordered. In this embodiment, the cumulative amount of concrete delivered can be accurately grasped, so the appropriate amount of concrete can be ordered, and the amount of leftover concrete can be reduced.

[0082] Furthermore, although the acceleration sensor 30 was installed in the hopper 21 of the pump truck 20 in the above-described embodiment, it can be installed in any location where the stroke can be detected, and may be installed in another part of the pump truck 20 (for example, the concrete supply pipe 29).

[0083] Furthermore, while the vibration of the pump truck 20 was detected by the acceleration sensor 30 in the above-described embodiment, this is not the only option. For example, a sound sensor (sound sensor) may be used to detect the sound generated by the stroke. Alternatively, if the concrete cylinder 23 is provided with a sensor to detect the stroke end of the concrete piston 24, the stroke may be detected using that sensor. In these cases as well, the number of strokes can be counted (detected) in the same manner as in the above-described embodiment.

[0084] Furthermore, although the above-described embodiment described the case of pouring concrete, it is not limited to concrete and can be similarly applied to other cement compositions (e.g., mortar). [Explanation of symbols]

[0085] 1. Concrete-filled steel tube structural column (CFT column), 2. Steel pipe, 2a. Inlet, 10 Concrete mixer truck, 12 Drum, 14 Chute, 20 Pump truck, 21 Hopper, 22 Pump, 23 Concrete cylinder (cylinder), 24 Concrete piston (piston), 25 hydraulic cylinders, 26 swing pipes, 27 Pipe-driven cylinder, 28 Piston rod, 29 Concrete supply pipes, 30. Accelerometer

Claims

1. A method for managing the discharge of a cement composition when using a pump truck equipped with a cylinder and piston for dispensing the cement composition, The reciprocating motion of the piston in the cylinder is detected by a sensor. Based on the detection results of the sensor, the capacity of the cylinder, and a correction value corresponding to the slump of the cement composition, the actual discharge speed or discharge amount of the cement composition discharged from the pump truck is determined. The cement composition is poured inside the steel pipe of the CFT column. The amount of discharged material is divided by the cross-sectional area of ​​the steel pipe at the cement composition placement site to determine the placement height. The cement composition is filled into the steel pipe without imposing excessive stress on it. A method for managing transmissions characterized by the following:

2. A method for managing the transmission of data according to claim 1, The reciprocating speed of the piston is detected by the aforementioned sensor, The discharge speed is determined based on the aforementioned reciprocating speed, the cylinder capacity, and the correction value. A method for managing transmissions characterized by the following:

3. A method for managing the transmission of data according to claim 1, The sensor detects the time required for one stroke of the piston. The discharge speed is determined based on the required time, the cylinder capacity, and the correction value. A method for managing transmissions characterized by the following:

4. A method for managing the transmission of data according to claim 1, The sensor detects the number of times the piston has reciprocated, The amount of discharged is determined based on the cumulative number of round trips, the capacity of the cylinder, and the correction value. A method for managing transmissions characterized by the following:

5. A method for managing the transmission of a signal according to claim 1 or claim 4, The pouring height is determined by dividing the amount of cement composition dispensed by the cross-sectional area of ​​the area where the cement composition is to be poured. A method for managing transmissions characterized by the following:

6. A transmission management method according to any one of claims 1 to 5, The sensor detects vibrations in the pump truck caused by the reciprocating motion of the piston. A method for managing transmissions characterized by the following:

7. A transmission management method according to any one of claims 1 to 5, The aforementioned sensor detects the sound generated in conjunction with the reciprocating motion of the piston. A method for managing transmissions characterized by the following:

8. A transmission management method according to any one of claims 1 to 5, The sensor detects the stroke end of the piston in the cylinder. A method for managing transmissions characterized by the following:

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