Sand discharge method in sand pile compaction method

Abstract

To enable not only skilled workers but also unskilled workers to discharge an appropriate amount of granular material into the ground when discharging the granular material into the ground by a sand pile compaction method.SOLUTION: A sand discharge method in a sand pile compaction method includes a first step of collecting the operation status of an operating device for discharging granular material and the discharge status of the granular material at that time for each type and condition of the granular material to be discharged or an original ground condition of a discharge destination and construction depth conditions, a second step of acquiring an optimal operating pattern for the operating device for each type and condition of the granular material to be discharged or the original ground condition of the discharge destination and construction depth conditions from the collected operation status of the operating device and the discharge status of the granular material at that time, and a third step of determining, from the acquired operation patterns of the operating device, an optimal operating pattern for the operating device that suits the conditions of the location where the granular material is to be discharged, and operating the operating device based on the determined operation pattern of the operating device to discharge the granular material into the ground.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a sand discharge method for discharging granular materials such as sand and crushed stone into the ground in a sand pile compaction method for improving the ground by constructing compaction sand piles in the ground. [Background technology]

[0002] Conventionally, sand compaction pile methods, such as the sand compaction pile method, sand drain method, and static compaction sand pile method, have been known as sand pile compaction methods for improving the ground by constructing compaction sand piles in the ground.

[0003] For example, let us consider the sand compaction pile method. As shown in Figure 1, the ground improvement device 1 used in the sand compaction pile method is equipped with a self-propelled construction machine 2 equipped with a driver's cab 3, and a mast 4 erected at the front of the construction machine 2. It is also equipped with a casing pipe 5 that can penetrate into the ground and moves up and down along the erected mast 4. The construction machine 2 penetrates the casing pipe 5 into the ground or pulls it out from the ground. The casing pipe 5 is a cylindrical tube that contains granular material M such as sand or crushed stone inside and discharges the granular material M into the ground from a discharge outlet 6 provided at its bottom end.

[0004] As shown in FIG. 2, the sand compaction pile method using this ground improvement device 1 involves inserting a casing pipe 5 containing granular material M into the ground to a predetermined depth (FIG. 2A). After insertion, the casing pipe 5 is withdrawn, and the granular material M is discharged into the ground from the outlet 6 at its lower end (FIG. 2B). The discharged granular material M is then driven back (FIG. 2C). This process of discharging the granular material M while withdrawing the casing pipe 5 and then driving the discharged granular material M back upward is repeated (FIGS. 2D and 2E). This creates an expanded compaction sand pile P in the ground (FIG. 2F). By creating an expanded compaction sand pile P in the ground in this way, the ground can be improved to a stronger one (Patent Document 1).

[0005] In the sand compaction pile method, when the granular material M is discharged into the ground while the casing pipe 5 is being pulled out, the ground improvement device 1 is equipped with various devices to ensure that an appropriate amount of granular material M, neither too much nor too little, is discharged into the ground from the casing pipe 5. That is, inside the casing pipe 5, there are devices for supplying A and discharging B compressed air to the space E above the contained granular material M, and devices for spraying compressed air (hereinafter referred to as jet J) onto the granular material M.

[0006] That is, as shown in Figure 3, inside the casing pipe 5, compressed air is supplied A from a compressor 10 to the space above the granular material M contained therein, or the air in the space above the casing pipe is exhausted B. By controlling the supply A and exhaust B, the pressure inside the space above the casing pipe 5 is adjusted. As a result, when the granular material M is discharged into the ground, the pressure inside the space above the casing pipe 5 is increased, allowing an appropriate amount of the granular material M inside the casing pipe 5 to be discharged into the ground through the discharge port 6. A pressure sensor 11 is also provided inside the space above the casing pipe 5, and measures the pressure inside the pipe. Furthermore, an injection hole 12 for jetting J is provided on the inner surface of the lower part of the casing pipe 5. When the granular material M is discharged through the discharge port 6, the jet J is injected from the injection hole 12 onto the granular material M to loosen the compacted granular material M, allowing an appropriate amount of the granular material M to be discharged through the discharge port 6. Furthermore, when the granular material M contained in the casing pipe 5 is discharged into the ground, whether the appropriate amount is being discharged can be determined by measuring the position of the top surface of the granular material M in the casing pipe 5 before and after discharge using a sand level meter 13 installed in the casing pipe 5.

[0007] In addition, the devices for supplying air A, exhausting air B, and spraying jet J into the inside of the casing pipe 5 are operated by operating devices provided in the operator's cab 3 of the construction machine 2. These operating devices include an on-off type air supply operating switch for supplying air A, an on-off type exhaust operating switch for exhausting air B, and an on-off type jet operating switch for spraying jet J.

[0008] However, in the sand compaction pile method, when discharging granular material M into the ground while pulling out the casing pipe 5, the worker operates the operating devices provided in the driver's cab 3 of the construction machine 2, namely the air supply operating switch, the exhaust operating switch, and the jet operating switch, to discharge the appropriate amount of granular material M, neither too much nor too little.However, the operation of the operating devices at this time varies depending on the type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth conditions.

[0009] That is, the worker must operate the operating device according to the type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth. Moreover, the operation of this operating device is complicated and takes place in units of one to several seconds. Therefore, while an experienced worker can properly operate the operating device and discharge the appropriate amount of granular material M into the ground, other workers have difficulty operating the operating device properly and are unable to discharge the appropriate amount of granular material M into the ground. In other words, there is a problem that the specified compaction sand pile P cannot be created in the ground, and the ground improvement cannot be carried out as planned. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 8-284146 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made in consideration of such problems, and its purpose is to provide a sand discharge method for the sand pile compaction method, which, when discharging granular material into the ground from a casing pipe in the sand pile compaction method for ground improvement, allows not only experienced workers but also unskilled workers to appropriately operate the operating device and discharge the appropriate amount of granular material into the ground depending on the type and condition of the granular material being discharged (for example, whether the granular material M is wet or dry, or whether it is firmly compacted or soft and loose), the original ground condition at the discharge destination, and the construction depth. [Means for solving the problem]

[0012] The present invention relates to a sand pile compaction method in which granular material is discharged from a casing pipe penetrated into the ground, and the discharged granular material is driven back and compacted to create a sand pile in the ground. The method comprises a first step of collecting the operation status of the operation device for discharging the granular material and the discharge status of the granular material at that time for each type and condition of the granular material to be discharged, or for each condition of the original ground at the discharge destination and construction depth; This is a sand discharge method for sand pile compaction construction, which includes a second step of acquiring an optimum operating pattern for the operating device based on the operating state of the operating device and the discharge state of the granular material at that time, for each condition of the type and condition of the granular material to be discharged or the original ground condition and construction depth of the discharge destination; and a third step of determining, from the acquired operating patterns for the operating device, an operating pattern for the operating device that is optimum for the conditions of the location where the granular material is to be discharged, and operating the operating device based on the acquired operating pattern for the operating device to discharge the granular material into the ground. [Effects of the Invention]

[0013] According to the present invention, when discharging granular material into the ground from a casing pipe in a sand pile compaction method, an optimal operating pattern for the operating device that matches the conditions of the location where the granular material is to be discharged is determined, and the operating device is operated based on the determined operating pattern, thereby discharging the appropriate amount of granular material into the ground, neither too much nor too little. This allows not only skilled workers but also non-skilled workers to discharge the appropriate amount of granular material, and by constructing the specified compaction sand pile in the ground, ground improvement can be carried out as planned. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side view showing a ground improvement device used in a sand pile compaction method. [Figure 2] This is a diagram showing the steps of the sand pile compaction method. [Figure 3] FIG. 2 is a cross-sectional view showing the inside of a casing pipe of the ground improvement device. [Figure 4] FIG. 1 is a flow diagram of a sand discharge method in the sand pile compaction method of the present invention. [Figure 5] 10A and 10B are diagrams showing the operation state of an operating device for discharging granular material and the discharge state of the granular material at that time. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the sand discharge method in the sand pile compaction method of the present invention will be described. The sand discharge method for the sand pile compaction method according to this embodiment is a sand pile compaction method in which compacted sand piles are constructed in the ground to improve the ground, such as the sand compaction pile method. When granular material such as sand or crushed stone is discharged into the ground from a casing pipe, the operating device is appropriately operated depending on the type and condition of the granular material to be discharged, the original ground condition of the discharge destination, and the construction depth, so that the appropriate amount of granular material is discharged into the ground without excess or deficiency. Note that while the sand compaction pile method is used here, it is not limited to this, and other sand pile compaction methods such as the sand drain method and static compaction sand pile method may also be used.

[0016] In this sand discharge method for sand pile compaction, the casing pipe 5 is the same as the conventional one already described (shown in Figure 3). That is, air is supplied A or exhausted B to the upper space E inside the casing pipe 5, and jet J is sprayed onto the granular material M from injection holes 12 provided on the inner surface of the casing pipe 5. In addition, the equipment for supplying air A, exhausting air B, and spraying jet J into the inside of the casing pipe 5 can be operated using an air supply operation switch, an exhaust operation switch, and a jet operation switch, which are operating devices provided in the operator's cab 3 of the construction machine 2. Also provided are a pressure sensor 11 for measuring the pressure in the upper space E of the casing pipe 5 and a sand level gauge 13 for determining the discharge status of the granular material M.

[0017] As shown in Figure 4, the sand discharge method in the sand pile compaction method of this embodiment includes a first step (S1) of collecting the operation state of the operating device for discharging the granular material and the discharge state of the granular material M at that time for each type and condition of the granular material M to be discharged, or the original ground condition of the discharge destination, and the construction depth; a second step (S2) of acquiring an optimal operating pattern for the operating device for each type and condition of the granular material M to be discharged, or the original ground condition of the discharge destination, and the construction depth, from the collected operation state of the operating device and the discharge state of the granular material M at that time; and a third step (S3) of determining from the acquired operation patterns of the operating device the optimal operating pattern for the location where the granular material M is to be discharged, and operating the operating device based on the determined operation pattern of the operating device. In addition, this sand discharge method is equipped with a processing device (e.g., a computer), which is not shown in the figure, and various programs are stored in this processing device, and various processing tasks are performed using the stored programs.

[0018] <First step> The first step (S1) is a step of collecting, through experiments and actual on-site construction, the operating status of the operating device for discharging the granular material M under various conditions, such as the type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth, and the discharge status of the granular material M at that time.

[0019] In this first step (S1), the type of granular material M to be introduced into the casing pipe 5 and discharged into the ground is determined based on the particle size of the granular material M, such as whether the granular material M is sand, crushed stone, or a mixture of these. The state of the granular material M is also determined based on whether the granular material M is wet or dry, or whether it is tightly packed or loosely packed. The state of the original ground to which the material is to be discharged is also determined based on the type of soil (gravel, sand, silt, clay, etc.) and the density of the original ground. The construction depth is determined based on the depth to which the granular material M is discharged into the ground.

[0020] For each of these classifications, that is, for each type and condition of the granular material M to be discharged, or the original ground conditions and construction depth at the discharge destination, data is collected on the operating status of the operating devices (air supply operating switch, exhaust operating switch, jet operating switch) and the discharge status of the granular material M at that time. The discharge state of the granular material M at that time is whether the discharge of the granular material M is good, excessive, or insufficient. Good means that the appropriate amount of granular material M is discharged into the ground from the casing pipe 5, neither too much nor too little, excessive discharge means that the amount is too much, and insufficient means that the amount is too little. The discharged amount is measured using a sand level gauge 13 installed inside the casing pipe 5.

[0021] This data can be collected by actually carrying out construction on-site, but it is difficult to collect all of it. Therefore, we create a device that matches the type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth, and conduct experiments under these conditions to collect data on the operating status of the operating device and the discharge status of the granular material M at that time. All of the collected data on the operating state of the operating device and the discharge state of the granular material M at that time is stored in the processing device.

[0022] The collected data will be described in detail below. The data was categorized by the type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth conditions, and the operating status of the operating devices in each section from before discharge began to after discharge was investigated, and at the same time, the discharge status of the granular material M at that time was investigated. For example, as shown in Figure 5, the operation states of the control devices shown in operation patterns 1, 2, and 3 in Figure 5 in one section before discharge starts, one section after discharge starts, two sections after discharge starts, three sections after discharge starts, four sections after discharge starts, and one section after discharge ends, i.e., the on / off states of the air supply control switch, the air exhaust control switch, and the jet control switch, are checked, and whether the discharge state of the granular material M when the control devices are operated in operation patterns 1, 2, and 3 is over-discharged, good, or insufficient is checked, and these are acquired as data. Note that the sections here, such as the one section before discharge starts, the one section after discharge starts, and the two sections after discharge starts, are separated by, for example, seconds, and may be one second. However, they are not limited to one second.

[0023] In this way, in the first step (S1), the operating status of the operating device for discharging the granular material M and the discharge status of the granular material M at that time are collected for each type and condition of the granular material M to be discharged, or the original ground conditions and construction depth conditions of the discharge destination.

[0024] <Second process> The second step (S2) is a step of acquiring the optimal operating pattern of the operating device for each type and condition of the granular material M to be discharged, or the original ground condition and construction depth at the discharge destination, and this optimal operating pattern of the operating device is acquired by the processing device.

[0025] In this second step (S2), the data on the operation status of the operating device and the discharge status of the granular material M at that time, collected in the first step (S1) and stored in the processing device, is analyzed, and from this, the optimal operating pattern of the operating device is obtained that will result in a good discharge status of the granular material M for each type and condition of the granular material M to be discharged, or for each original ground condition and construction depth at the discharge destination, i.e., that will allow an appropriate amount of granular material M to be discharged into the ground from the casing pipe 5, neither too much nor too little.

[0026] This optimal operating pattern for the operating device is obtained using a very common statistical method, and the optimal operating pattern for the operating device is obtained for each type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth from the collected data on the operating status of the operating device. In addition to this, by having a computer learn by machine learning the optimal operating pattern for the operating device for each type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth from the collected data on the operating status of the operating device, the computer can automatically perform optimization, inference, judgment, etc., and obtain the optimal operating pattern for the operating device. Furthermore, by using a combination of general statistical methods and machine learning, it is possible to obtain the optimal operating pattern of the operating device for each type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth from the collected data on the operating status of the operating device.

[0027] In this way, in the second step (S2), the optimal operating pattern of the operating device is obtained based on the operating state of the operating device collected in the first step (S1) and the discharge state of the granular material M at that time, depending on the type and state of the granular material M to be discharged, the original ground state of the discharge destination, and the construction depth.

[0028] <Third process> The third step (S3) is a step of determining an optimum operating pattern of the operating device that matches the conditions of the location where the granular material M is discharged from the optimum operating patterns of the operating device for each condition obtained in the second step, and operating the operating device based on the determined operating pattern of the operating device. The work of determining the optimum operating pattern of the operating device here is performed in the processing device.

[0029] In the third step (S3), the optimal operation pattern for the operating devices (air supply switch, exhaust switch, and jet switch) that matches the conditions of the location where the granular material M is to be discharged is determined from the optimal operation patterns for the operating devices (air supply switch, exhaust switch, and jet switch) for each type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth obtained in the second step (S2). The determined operation pattern for the operating devices is then displayed, for example, on a monitor (not shown) installed in the driver's cab 3 of the construction machine 2 where the operating devices are installed. The operator then operates the operating devices based on the operation pattern displayed on the monitor. That is, the on / off status of each of the operating devices' air supply switch, exhaust switch, and jet switch is displayed on the monitor, and the operator operates the operating devices (air supply switch, exhaust switch, and jet switch) based on the displayed operation pattern for the operating devices. This allows the appropriate amount of granular material M to be discharged into the ground from the casing pipe 5, neither too much nor too little.

[0030] In addition, regarding the operation of the operating devices, here the worker operates the operating devices manually while looking at the monitor, but instead, the operating devices may be operated automatically, for example, using a computer installed on the construction machine 2.

[0031] In this way, in the third step (S3), the optimum operation pattern of the operating device that suits the conditions of the location where the granular material M is to be discharged is determined, and the operating device is operated based on the determined operation pattern of the operating device to discharge the granular material M into the ground, thereby enabling the appropriate amount of granular material M to be discharged into the ground from the casing pipe 5, neither too much nor too little.

[0032] As described above, according to this embodiment, the optimal operating pattern for the operating device is acquired for each condition of the type and condition of the granular material M to be discharged, the original ground condition of the discharge destination, and the construction depth. From the acquired operating patterns for the operating devices, the optimal operating pattern for the operating device that suits the conditions of the location where the granular material is to be discharged is determined. By operating the operating device based on the determined operating pattern for the operating device, it is possible to discharge the appropriate amount of granular material M into the ground, neither too much nor too little. This allows not only experienced workers but also other workers to discharge the appropriate amount of granular material M, and by constructing the specified compaction sand pile P in the ground, it is possible to improve the ground as planned.

[0033] Furthermore, since the task of discharging granular material M into the ground in the sand pile compaction method can be performed accurately not only by skilled workers but also by other workers, it can also be used to solve the current problem in the construction industry of labor shortages and the difficulty in securing human resources due to the aging of workers. [Explanation of symbols]

[0034] 1...ground improvement device, 2...construction machine, 3...operator's cab, 4...mast, 5...casing pipe, 6...discharge outlet, 10...compressor, 11...pressure sensor, 12...jet nozzle, 13...sand level gauge.

Claims

1. A sand pile compaction method in which granular material is discharged from a casing pipe penetrated into the ground, and the discharged granular material is driven back and compacted to create a sand pile in the ground, wherein a sand discharge method for the sand pile compaction method is performed by operating an operating tool when discharging the granular material into the ground, A first step of collecting information on the operation status of the operating device for discharging the granular material and the discharge status of the granular material at that time, for each type and condition of the granular material to be discharged, or for each condition of the original ground at the discharge destination and construction depth; A second step of acquiring an optimal operating pattern for the operating device for each type and condition of the granular material to be discharged, or the original ground condition and construction depth of the discharge destination, based on the collected operating status of the operating device and the discharge status of the granular material at that time; a third step of determining, from the obtained operation patterns of the operating device, an operation pattern of the operating device that is optimal for the conditions of the location where the granular material is to be discharged, and operating the operating device based on the determined operation pattern of the operating device to discharge the granular material into the ground; A sand discharge method in a sand pile compaction method, comprising:

2. In the sand discharge method for the sand pile compaction method according to claim 1, A method of discharging sand using a sand pile compaction method, in which the operating devices for discharging granular material are an air supply operating switch for supplying air into the casing pipe, an exhaust operating switch for exhausting air from inside the casing pipe, and a jet operating switch for injecting compressed air into the casing pipe.

3. In the sand discharge method for the sand pile compaction method according to claim 1 or 2, A method for discharging sand in a sand pile compaction method in which the operation of the operating device in the third step is performed manually or automatically.

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