JP2013256847A - Core generating device and core generating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and simply acquire a core with good economical efficiency.SOLUTION: A core generating device 100 includes a mixing device 40 for mixing water 4 with excavated soil 3 occurring with progress of boring, a separation device 60 for reducing flow rate of mixture 5 of the excavated soil 3 and the water 4, and settling the excavated soil 3 of the mixture 5, and a cylindrical body 70 coupled to the lower part of the separation device 60 for accumulating the settled excavated soil 3 therein.

Description

  The present invention relates to a core generation apparatus and a core generation method, and specifically relates to a technique for acquiring a core efficiently and easily with good economic efficiency.

  For various purposes such as construction of structures and academic surveys, core sampling is performed to confirm the composition and properties of the formation in the ground. On the other hand, when the target ground for core sampling is soft, it is difficult to collect the core itself, and so-called core loss is often caused in which the collected core is dropped into the borehole.

  Therefore, as a core sampling technique to cope with such a problem, for example, the suction pipe fixed between the outer pipe and the outer pipe is rotated while sucking earth and sand with the suction pipe disposed between the outer pipe and the inner pipe. A sampling device (see Patent Document 1) using absorption boring that digs up and closes the lower end of the sample accommodated in the inner pipe has been proposed.

  In addition, for various grounds including sedimentary soils and soft rocks, in order to collect cores at high speed and high sampling rate with a single system and to collect good quality cores without oxygen contamination, inert gas and A technique (see Patent Document 2), in which suspended bubble water mixed with fresh water is pumped into a rod of an excavator and the core is isolated from the atmosphere, has been proposed.

  In addition, in order to sample high-quality frozen ground samples without disturbing granular ground such as sand and gravel ground, the surrounding ground is frozen by circulating a low-temperature fluid through a cooling pipe installed in the borehole. A technique for sampling frozen soil from the frozen ground (see Patent Document 3) has also been proposed.

JP 2004-45308 A JP 2002-295169 A Japanese Patent Laid-Open No. 9-3867

  However, even if core sampling is performed by any of the conventional methods, it is necessary to introduce dedicated equipment and to collect cores every few meters during boring, which requires considerable cost, labor, and time. In addition, every time a core is collected, a process of reciprocating the core sampling equipment between the ground surface and the core collection point is required. If the boring depth is deep, it takes time and labor. On the other hand, even if core sampling is performed while taking various measures, once core loss occurs, it is difficult to supplement the data on the structure and properties of the formation at the relevant location.

  Accordingly, an object of the present invention is to provide a technique for acquiring a core efficiently and easily with good economic efficiency.

  The core generating apparatus of the present invention that solves the above-described problem is a mixing device that mixes excavated soil generated with the progress of boring with water, and reduces the flow rate of the mixture of the excavated soil and water, Of these, a separating device for sinking the excavated soil and a cylindrical body connected to a lower portion of the separator and depositing the settled excavated soil are provided.

  According to such technology, efficient core generation is achieved by introducing simple and low-cost devices such as drilling soil and water mixing devices generated by boring devices and piping for reducing the flow rate of the mixture. It can be done automatically.

  In addition, it is possible to automatically generate the core by laminating the excavated soil in the surface cylindrical body while continuously boring, and as before, the core is collected every few meters to collect the core. The process of temporarily stopping and reciprocating the core sampling equipment between the ground surface and the core sampling point is not necessary. Therefore, the core can be acquired efficiently and without any trouble regardless of the depth of the boring.

  Furthermore, the core in the present invention is automatically generated in a cylindrical body installed on the ground surface, and the work of holding and transporting the core obtained by core sampling from the borehole to the ground surface as in the prior art is performed. It is not necessary and there is no fear of core loss because core sampling itself is not performed in the borehole. On the other hand, by applying the present invention to boring with core sampling, for example, core sampling is performed on a soft ground layer where it is difficult to collect cores. The core automatically generated by the technology of the invention can be supplemented as an alternative core. Therefore, even if a core loss occurs, it is possible to grasp the actual structure and properties of the stratum in the corresponding location.

  In addition, the excavated soil generated in the boring work can only be disposed of as industrial waste in the past, but it can be used in the core generation device of the present invention as a core indicating the structure and properties of the formation in the target ground. It will be used effectively.

  Therefore, according to the present invention, the core can be obtained efficiently and easily with good economic efficiency.

  In the above core generation device, the separation device has a structure in which the mixture is made of a conduit that guides the mixture from the mixing device to the cylindrical body, and the diameter of the pipe is enlarged at a connection portion with the cylindrical body, The flow rate of the mixture may be decreased. According to such a technique, it becomes possible to continuously separate the excavated soil from the mixture by an apparatus having a simple structure.

  Further, in the above core generating device, the mixing device causes water to be ejected laterally along the inner wall surface of the mixing device to generate a vortex in the mixing device, and the mixing of the excavated soil and water It is good also as what is performed. According to such a technique, the water ejected along the inner wall surface of the mixing device circulates in the inner space to generate a vortex, and the excavated soil thrown into the inner space is entrained in the vortex. It will be. The water constituting the vortex and the excavated soil entrained in the vortex are well mixed with each other by the rotation of the vortex.

  Moreover, the above-mentioned core production | generation apparatus is good also as providing the washing | cleaning apparatus which is a pipe line which repeats the bending which connects between the said mixing apparatus and the said separation apparatus. According to such a technique, the flow of the mixture that has flowed into the cleaning device can be bent repeatedly, and the lump of excavated soil contained in the mixture can be unwound and reduced in diameter. Moreover, the effect which isolate | separates from the excavation soil the component of the mud for excavation adhering to the excavation soil of the said mixture can also be expected. Such an effect leads to efficient separation of the excavated soil from the mixture by the above-described separation device, and the excavated soil that settles and stacks in the cylindrical body contains a mud component for boring holes. This can be appropriately suppressed. This leads to the core generated in the cylindrical body well reflecting the actual properties of the various layers in the ground.

  Moreover, in the above-described core generation apparatus, all or a part of the cylindrical body may be transparent. According to such a technique, the core produced | generated in a cylindrical body can be easily visually recognized during the production | generation or after the completion of production | generation. In the above core generating apparatus, the cylindrical body may be a resin bag. According to such a technique, when the core is continuously generated with the progress of the boring, the cylindrical body, that is, the bag body in which the inner space is appropriately filled with the stacked excavated soil, is quickly turned into a new bag body. It is possible to continue the core generation smoothly without causing boring and drowning. If it is a resin-made bag body, handling will be easy and introduction cost will also be low, and the effort and cost concerning core production | generation can further be reduced.

  The core generating method of the present invention includes a step of mixing excavated soil generated with the progress of boring with water, and a predetermined mixture of the excavated soil and water with respect to a predetermined cylindrical body. When flowing through the pipe line, the flow rate of the mixture is reduced, the excavated soil of the mixture is settled in the cylindrical body, and the excavated soil at each progress point of boring is stacked in the cylindrical body And a process.

  According to the present invention, a core can be obtained efficiently and easily with good economic efficiency.

It is a figure which shows the example of application of the core production | generation apparatus in this embodiment. It is a figure which shows the structural example of the mixing apparatus in this embodiment. It is a figure which shows the outline | summary of the separation apparatus in this embodiment. It is a figure which shows the structural example 1 of the core collection container (cylindrical body) in this embodiment. It is a figure which shows the structural example 2 of the core collection container (cylindrical body) in this embodiment. It is a figure which shows the example of an actual procedure of the core production | generation method in this embodiment.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram illustrating an application example of the core generation device 100 in the present embodiment. The core generating apparatus 100 of the present embodiment uses the excavated soil 3 generated by the boring machine 20 and generates a core easily by sequentially laminating the excavated soil 3 in a predetermined cylindrical body as the boring progresses. In the example of FIG. 1, the form which comprised the core production | generation apparatus 100 mainly with the mixing apparatus 40, the washing | cleaning apparatus 50, the separation apparatus 60, and the core collection container 70 (cylindrical body) is shown. Hereinafter, each device including the boring machine 20 will be described.

  The boring machine 20 is a ground excavating device used in ground surveys and the like prior to construction of a structure, for example, a mechanism for gripping and rotating a drilling rod equipped with a drill bit at the tip, and for drilling including bentonite. A mud circulation mechanism that pumps the mud 2 into the drilling rod and collects the excavated soil mixed mud 1 after the drilling operation, and a mud that collects the excavated soil mixed mud 1 and collects the drilled mud 2 A screen 30 and various tanks for storing water and bentonite liquid are provided.

  In the drilling soil mixed mud water 1 generated in the boring hole in the boring machine 20, ground excavation scraped by the drill bit at the tip of the drilling rod, that is, the drilling soil 3 is entangled with the bentonite of the drilling mud 2. It is in the state. The excavated soil mixed mud 1 is supplied to the mud screen 30, and solid-liquid separation between the excavated soil 3 and the drilling mud 2 is achieved. The excavated soil 3 after the solid-liquid separation, that is, the primary separation is supplied to the mixing device 40. On the other hand, the drilling mud 2 after solid-liquid separation is stored in the mud tank 21 and supplied again to the boring machine 20 via the pump 22.

  The mixing device 40 that receives the supply of the excavated soil 3 from the mud screen 30 is a device that mixes the excavated soil 3 with the fresh water 4. More specifically, as shown in FIG. 1 and FIG. 2, the fresh water 4 is accommodated laterally along the inner space 44 for accommodating the excavated soil 3 and the fresh water 4 and performing the mixing operation, and the wall surface 45 of the inner sky 44. It becomes an apparatus provided with the ejection pipe | tube 42 which ejects. The fresh water 4 ejected from the ejection pipe 42 becomes a jet that circulates around the inner sky 44 along the wall surface 45 and generates a vortex 43. The excavated soil 3 put into the inner space 44 in the mixing device 40 is caught in the vortex 43 and sufficiently mixed with the fresh water 4 constituting the vortex 43. In the mixing device 40, the excavated soil 3 and the fresh water 4 are mixed in this way to generate the mixture 5. The fresh water 4 is stored in a fresh water tank 41 and is supplied to the mixing device 40 by an appropriate pump or the like.

  As described above, the excavated soil 3 included in the mixture 5 has been subjected to solid-liquid separation by the mud screen 30, but some of the drilling mud 2 (hereinafter referred to as a muddy water component) that could not be solid-liquid separated. ) Remains attached. Therefore, in the present embodiment, the above-described mixture 5 containing the excavated soil 3 is supplied from the mixing device 40 to the cleaning device 50, and a cleaning operation is performed to remove muddy water components. The cleaning device 50 is composed of a pipe line (hereinafter, a bent pipe line 51) that connects the mixing apparatus 40 and the separation apparatus 60 and repeats bending.

  The mixing device 40, the cleaning device 50, and the separation device 60 are arranged in the order of the arrangement height from the ground surface in the order of the mixing device 40, the cleaning device 50, and the separation device 60, and the mixture in each device. It is considered that a water head difference is generated for a liquid level of 5 etc. Therefore, the mixture 5 in the mixing device 40 flows into the cleaning device 50 using the water head difference, and the mixture 5 washed by the cleaning device 50 flows into the separation device 60 using the water head difference. Of course, without depending on such a water head difference, a pumping device such as a pump may be arranged between the devices to transport the mixture 5.

  The bent pipe 51 constituting the cleaning device 50 is bent repeatedly while colliding the flow of the mixture 5 that has flowed into the inner wall of the pipe, so that the mixture 5 is vigorously mixed back and the mass of the excavated soil 3 included in the mixture 5 is unraveled. The diameter can be reduced. Moreover, the muddy water component adhering to the excavated soil 3 of the mixture 5 is appropriately separated (secondary separation). The mixture 5 obtained after the secondary separation includes the excavated soil 7 in which the diameter of the excavated soil 3 is reduced and the mud component is separated from the state of the excavated soil 3 so far. In such a mixture 5, the excavated soil 7 and the muddy water component are present in a mixed state while being separated.

  Through such a process, it becomes possible to efficiently sink only the excavated soil 7 in the subsequent processing by the separation device 60. As a result, the core generated in the core collection container 70 becomes the various layers in the ground. It will lead to a good reflection of the actual properties of the.

  In addition, when the muddy water component adheres to the excavated soil 3 included in the mixture 5 at such a low level that there is no problem, the arrangement of the cleaning device 50 may be omitted. In addition, in the example of the cleaning device 50 in FIG. 1, the bent pipe 51 is shown to be repeatedly bent, but the bent shape depends on the properties, flow rate, flow rate, etc. of the mixture 5. An appropriate one that can efficiently perform the above-described cleaning operation may be employed.

  The separation device 60 includes a conduit that guides the mixture 5 from the cleaning device 50 (mixing device 40 when the cleaning device 50 is omitted) to the core collection container 70. As illustrated in FIG. The connecting portion 62 has a structure in which the pipe diameter is enlarged, and an inflow conduit 61 into which the mixture 5 flows, and an outflow conduit 65 that is downstream of the connecting portion 62 and has a larger pipe diameter than the inflow conduit 61. It consists of. Further, the separation device 60 and the core collection container 70 are integrally connected, and a part of the bottom surface of the outflow pipe 65 is continuous with the upper opening 71 of the core collection container 70.

  The mixture 5 that has flowed through the inflow pipe 61 described above flows into the outflow pipe 65 having a pipe diameter 64 larger than the pipe diameter 63 at the connection point 62. When the pipe diameter of the pipe line is larger than that of the previous pipe, the flow rate of the mixture 5 traveling through the corresponding part is reduced. In the mixture 5 with a reduced flow velocity, the excavated soil 7 and the mud component 8 (FIG. 3) that have been separated but flowed together until then are lower in the excavated soil 7 having a particle diameter and specific gravity larger than the mud component 8. It sinks and settles into the core collection container 70 through the upper opening 71 from the bottom surface of the outflow pipe 65. On the other hand, in the mixture 5 whose flow velocity is reduced, the muddy water component 8 is directly carried on the flow, moves through the outflow pipe 65, and finally flows down toward the settling tank 80. In FIG. 3, only a part of the sedimentation tank 80 is shown.

  The muddy water component 8 flows into the settling tank 80, and then is allowed to stand for a predetermined period of time, thereby separating it into bentonite 9 and fresh water 4 (see FIG. 1). The fresh water 4 that becomes the supernatant of the settling tank 80 is collected in the fresh water tank 41 via the pump 82.

  On the other hand, the excavated soil 7 settled in the core collection container 70 is sequentially deposited from the bottom surface of the core collection container 70. Since the excavated soil 7 accumulated in the core collection container 70 changes for each formation to be drilled by the boring machine 20, the excavated soil 7 in the core collection container 70 is repeatedly deposited, so that the excavated soil having different properties is obtained. The strata-shaped core 15 is formed by sequentially stacking 7 layers.

  Next, a specific structural example of the core collection container 70 is shown in FIG. As described above, the core collection container 70 is a container for generating the core 15 by depositing the excavated soil 7 settling from the separation device 60. On the other hand, the amount of excavated soil discharged from the boring machine 20 corresponds to the boring length, and it is often difficult to generate a formation core over the entire depth during boring with the core collecting container 70 of only one body. Therefore, in order to cope with such a situation, it is preferable to prepare a plurality of core collection containers 70 and prepare in advance so that the total extension thereof can correspond to the total length of the boring.

  As an example of such a configuration, as shown in FIG. 4, a container holder 75 in which the core collection container 70A used at the present time is set in the inner space 76, and a spare core required after the use of the core collection container 70A are used. A structure in which a container 77 in which a plurality of collection containers 70B are stored is arranged. In addition, when the core collection container 70A set in the container holder 75 is released from the inner space 76 after being disconnected from the separation device 60, a part of the core collection container 70A is loosely connected. Assume that the core collection container 70B is pulled out of the container 77 in conjunction with the operation of taking out the core collection container 70A and set in the inner space 76 of the container holder 75. Of course, the spare core collection container 70B set in the inner space 76 is connected to the separation device 60 in the same manner as the core collection container 70A.

  Here, the upper end (opening) of the core collection container 70 </ b> A set in the container holder 75 is connected to the bottom surface (opening) of the separation device 60 and the connector 66 in a watertight and detachable manner. . As the connector 66, a circular pipe having an inner wall provided with a female screw that is watertightly engaged with a screw thread on the outer periphery of the upper end of the core collection container 70 </ b> A and a screw thread on the outer periphery of the bottom surface of the separation device 60 can be used. Alternatively, as the coupling tool 66, the inner wall includes a joining surface that is watertightly joined to both of the upper end outer circumferential surface of the core collection container 70A and the bottom outer circumferential surface of the separation device 60, and the core collection container at the joint surface. A restraining tool or the like that restrains the outer peripheral surface of the upper end of 70A and the outer peripheral surface of the bottom surface of the separation device 60 can also be employed.

  In the core collection container 70A set in the container holder 75, when the core 15 is generated up to a predetermined height, for example, the person in charge loosens the connection at the connector 66 and removes the core collection container 70A from the separation device 60. Then, it is pulled out from the container holder 75 and placed in a predetermined core storage box or the like. On the other hand, as the core collection container 70A is pulled out from the container holder 75, a new core collection container 70B in which the core 15 is not generated is set in the inner space 76 of the container holder 75. Therefore, the person in charge described above connects the separation device 60 to the core collection container 70 </ b> B with the connector 66 to prepare for the next generation of the core 15.

  In addition, if the core collection container 70 is made up of a part or all of a transparent member, a person in charge of the core collection container 70 generates or completes the generation of the core generated in the core collection container 70. It can be easily seen later. 4 and 5, a see-through window 72 is provided in a part of the core collection container 70. The see-through window 72 is made of a transparent resin material.

  Further, as the core collection container 70, a resin bag may be adopted. When the core 15 is continuously generated along with the progress of the boring, the bag body appropriately filled with the core 15, that is, the core collection container 70 is quickly replaced with a new bag body, and the progress and dredging of the boring are performed. It is possible to continue the core generation smoothly without coming. If it is a resin-made bag body, handling will be easy and introduction cost will also be low, and the effort and cost concerning core production | generation can further be reduced.

  As another example of the structure of the core collection container 70, the structure shown in FIG. In this case, a plurality of core collection containers 70 each connected to the cleaning device 50 by piping are prepared in parallel, and the core collection container to be used is switched by switching the piping path as the boring machine 20 proceeds with the boring. 70 will also be switched in sequence, so that it can accommodate the full length of the boring.

  In the example of FIG. 5, a core collection container 70C used at the present time and a spare core collection container 70D required after the use of the core collection container 70C are erected. The core collection container 70C is connected to the flow switch 69 through a pipe 67, and the core collection container 70D is connected to the flow switch 69 through a pipe 68. The flow path switch 69 switches the flow destination of the mixture 5 flowing from the cleaning device 50, and the flow destination of the mixture 5 can be switched to one of the pipe 66 or the pipe 67 by the operation of the person in charge. FIG. 5 shows an example in which only two of the core collection container 70C and the core collection container 70D are arranged in parallel, but a form in which three or more of them are arranged in parallel may be adopted.

  In addition, each upper end (opening) of the core collection container 70C and the core collection container 70D is connected to the bottom surface (opening) of the separation device 60 and the coupling tool 66 in a watertight and detachable manner. The structure of the connector 66 is the same as that already described above. When the core 15 is generated up to a predetermined height in the core collection container 70 </ b> C connected to the separation device 60 in which the mixture 5 is flowing down, for example, the person in charge operates the flow path switch 69 to flow down the mixture 5. The separation device 60 is switched to the one connected to the core collection container 70D. Then, the core generation has been performed in the core collection container 70C until then, but the core generation is performed in the core collection container 70D. On the other hand, the person in charge described above loosens the connection at the connector 66, removes the core collection container 70C from the separation device 60, and places it in a predetermined core storage box or the like. Further, instead of the removed core collection container 70C, another core collection container 70 is connected to the separation device 60 to prepare for the generation of a new core.

  In addition, the operation | movement which fills the measured value of the boring depth in the boring machine 20 in a certain time into the corresponding location of the core 15 currently deposited in the core collection container 70 or the corresponding location of the core collection container 70 at the same time is repeated. Then, the correspondence between the layer thickness of the core 15 and the actual layer thickness of the ground can be confirmed. Such an operation may be controlled and executed by a computer connected to the control device of the boring machine 20. In this case, the computer acquires a measurement value of the boring depth by communicating with the control device of the boring machine 20, and has a mechanism capable of performing various markings such as printing, painting, and medium pasting at arbitrary positions of the core collection container 70 or the core 15. An instruction to mark the measurement value of the boring depth is sent. The mechanism that has received this instruction moves the printing device, for example, to a position above a predetermined distance from the bottom of the core collection container 70 in accordance with the information on the marking position included in the instruction, and executes the measurement value printing operation. The operation of entering the boring depth (for example, every 1 meter) in the boring machine 20 in the corresponding part of the core 15 being deposited in the core collecting container 70 or the corresponding part of the core collecting container 70 at the same time. May be executed by a worker.

  The core 15 generated in the core collection container 70 can be further improved in accuracy by associating with the actual boring depth in this way. In addition, by combining with various logging data in the borehole, it is possible to avoid duplicate logging in the formation whose layer thickness and properties are already known in the core 15, and to complement each other's data. .

  On the other hand, the excavated soil 7 settled in the core collection container 70 is sequentially deposited from the bottom surface of the core collection container 70. Since the excavated soil 7 accumulated in the core collection container 70 changes for each formation to be drilled by the boring machine 20, the excavated soil 7 in the core collection container 70 is repeatedly deposited, so that the excavated soil having different properties is obtained. The strata-shaped core 15 is formed by sequentially stacking 7 layers.

  In addition, the case where the layer thickness of each layer constituting the core 15 described above is not simply proportional to the layer thickness of the corresponding formation (the formation target for the boring machine 20) is sufficiently conceivable. For example, when drilling is performed in each of the strata having the same layer thickness but significantly different strength (eg, a tight sandy soil layer and a very soft viscous soil layer), the properties of the excavated soil 7 obtained are It is conceivable that the layer thickness when deposited on the core collection container 70 is different because it is greatly different. Moreover, even if it is the drilling soil 7 obtained by drilling in one formation, if the amount of water used for the cleaning changes with time, the properties of the drilling soil 7 also change with time. It is conceivable that different layers are formed in the core collection container 70 every time.

  Next, a specific structural example of the core collection container 70 is shown in FIG. As described above, the core collection container 70 is a container for generating the core 15 by depositing the excavated soil 7 settling from the separation device 60. On the other hand, the amount of excavated soil discharged from the boring machine 20 corresponds to the boring length, and it is often difficult to generate a formation core over the entire depth during boring with the core collecting container 70 of only one body. Therefore, in order to cope with such a situation, it is preferable to prepare a plurality of core collection containers 70 and prepare in advance so that the total extension thereof can correspond to the total length of the boring.

  Next, the procedure of the core generation method of this embodiment will be described. FIG. 6 is a diagram illustrating an actual procedure example of the core generation method according to the present embodiment. Here, it is assumed that the separation device 60 and the core collection container 70 of the core generation device 100 described above are pre-filled with fresh water 4. Further, the excavated soil mixed mud 1 generated by the boring in the boring machine 20 is supplied to the mud screen 30 and the solid-liquid separation between the excavated soil 3 and the drilling mud 2 is achieved.

  In this case, the excavated soil 3 obtained by solid-liquid separation on the mud screen 30 is supplied to the mixing device 40 by an appropriate conveying device such as a belt conveyor (s100). The mixing device 40 that has received the supply of the excavated soil 3 from the mud screen 30 puts the excavated soil 3 into the inner space 44, and ejects fresh water 4 along the wall surface 45 from the ejection pipe 42. Are mixed to form a mixture 5 (s101). The mixing of the excavated soil 3 and the fresh water 4 is efficiently performed by the vortex 43 described above.

  Then, the mixture 5 produced | generated with the mixing apparatus 40 is supplied to the bending pipe line 51 of the washing | cleaning apparatus 50, and washing | cleaning operation | movement is performed (s102). The flow of the mixture 5 flowing into the bent pipe 51 is repeatedly bent while colliding with the inner wall of the pipe, whereby the muddy water component 8 attached to the excavated soil 3 of the mixture 5 is separated. The mixture 5 obtained after the secondary separation includes the excavated soil 7 in which the separation of the mud component 8 has progressed from the state of the excavated soil 3 so far.

  Further, the mixture 5 subjected to the above-described cleaning operation by the cleaning device 50 is supplied to the separation device 60. In the separation device 60, the supply of the mixture 5 is received from the cleaning device 50 through the inflow conduit 61. The mixture 5 flowing through the inflow pipe 61 flows into the outflow pipe 65 having a pipe diameter 64 larger than the pipe diameter 63 so far at the connection location 62, so that the flow velocity thereof decreases. In the mixture 5 in which the flow velocity is greatly reduced, among the excavated soil 7 and the mud component 8 that have flowed together while being separated, the excavated soil 7 having a particle diameter and specific gravity larger than that of the mud component 8 sinks downward.

  The excavated soil 7 settles into the core collection container 70 from the bottom surface of the outflow pipe 65 through the upper opening 71 of the core collection container 70 (s103). In the core collection container 70, the excavated soil 7 that sinks downward from the upper opening 71 is sequentially deposited from the bottom surface of the core collection container 70. Since the excavated soil 7 accumulated in the core collection container 70 changes for each formation to be drilled by the boring machine 20, the excavated soil 7 in the core collection container 70 is repeatedly deposited, so that the excavated soil having different properties is obtained. The strata-shaped core 15 is formed by sequentially stacking 7 layers.

  On the other hand, in the mixture 5 whose flow velocity is greatly reduced, the muddy water component 8 rides on the flow as it is, moves through the outflow pipe 65, and finally flows down toward the settling tank 80. The muddy water component 8 flows into the settling tank 80 and is then allowed to stand for a predetermined period of time, whereby it is separated into bentonite 9 and fresh water 4. The fresh water 4 that becomes the supernatant of the settling tank 80 is collected in the fresh water tank 41 via the pump 82.

  After the above steps, it is confirmed whether or not the core 15 has been generated to a predetermined height in the core collection container 70 and whether or not the boring in the boring machine 20 has been completed (s104). As a result of this confirmation, when the boring in the boring machine 20 has been completed (s105: N), the core collection container 70 is collected (s106), and the process is terminated.

  On the other hand, when the boring in the boring machine 20 is in progress (s105: Y) and the core 15 has not yet been generated to a predetermined height (s107: NG), the core collection container 70 currently in use is used as it is. The core generation is determined to be continued, and the above steps s100 to s104 are repeatedly executed.

  On the other hand, when the boring in the boring machine 20 is in progress (s105: Y) and the core 15 is generated to a predetermined height (s107: OK), it is determined that the core collection container 70 needs to be replaced. The person in charge replaces the core collection container 70 filled with the core 15 with a new core collection container 70 (s108), and continues the core generation (s100 to s104). The replacement and recovery of the core collection container 70 is the same as the procedure described above. In this way, the core collection container 70 is sequentially replaced with the progress of the boring in the boring machine 20, and the core corresponding to the entire length of the boring is generated. Such a replacement operation of the core collection container 70 is easy to handle if the core collection container 70 is a bag made of resin such as vinyl, and the work efficiency is increased.

  As described above, according to the present embodiment, the core can be obtained efficiently and easily with good economic efficiency. Further, although the embodiment of the present invention has been specifically described based on the embodiment, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Mud 2 Drilling mud 3 Drilling soil 4 Fresh water 5 Mixture 7 Drilling soil 8 Mud component 9 Bentonite component 20 Boring machine 21 Mud tank 22 Pump 30 Mud screen 40 Mixing device 41 Fresh water tank 42 Jet pipe 43 Eddy current 44 Inner air 45 Wall surface 50 Cleaning Device 51 Bent Pipe Line 60 Separating Device 61 Inflow Pipe Line 62 Connection Portion 63, 64 Pipe Diameter 65 Outlet Pipe Line 66 Connector 67 68 Pipe 69 Flow Switch 70 Core Collection Container (Cylindrical Body)
70A, 70B, 70C, 70D Core collection container 71 Upper opening 72 Transparent window 75 Container holder 76 Inner space 77 Container 80 Settling tank 82 Pump 100 Core generator

Claims (7)

A mixing device for mixing excavated soil generated with the progress of boring with water;
A separator for lowering a flow rate of the mixture of the excavated soil and water, and sinking the excavated soil out of the mixture; a cylindrical body connected to a lower portion of the separator and depositing the settled excavated soil;
A core generation device comprising: In claim 1,
The separation device includes a pipe line that guides the mixture from the mixing device to the cylindrical body, and has a structure in which a pipe diameter is enlarged at a connection portion with the cylindrical body, and reduces the flow rate of the mixture. A core generator characterized by that. In claim 1 or 2,
The mixing device is characterized in that water is jetted laterally along an inner wall surface of the mixing device to generate a vortex flow in the mixing device, thereby mixing the excavated soil and water. A core generator. In any one of Claims 1-3,
A core generating apparatus comprising a cleaning device that is a pipe line that repeatedly bends and connects between the mixing device and the separation device. In any one of Claims 1-4,
The core generator is characterized in that all or part of the cylindrical body is transparent. In claim 5,
The said cylindrical body is a resin-made bag body, The core production | generation apparatus characterized by the above-mentioned. Mixing the excavated soil generated with the progress of boring with water;
When the mixture of the excavated soil and water flows into the predetermined cylindrical body standing through the predetermined pipeline, the flow rate of the mixture is reduced, and the excavated soil of the mixture is removed from the cylinder. Settling in the cylindrical body, and laminating excavated soil at each progress point of the boring in the cylindrical body,
A core generation method comprising:

Images