Sample sampling device and sample sampling method for earth pressure shield tunneling

Abstract

To appropriately and easily collect a sample from inside a chamber in order to perform a test on plastic fluidity or the like with respect to the sample inside the chamber in a soil pressure shield method.SOLUTION: A sample sampling device holder 20 is attached to an inside of a shield machine in a bulkhead opening 10 provided in a bulkhead 60. A sampling part 70 of a sample sampling device main body 30 is rotatably attached to the sample sampling device holder 20. By rotating the sampling part 70 using a rotation drive device 80 with the sampling part 70 fitted into a sliding recess 22 provided in the sample sampling device holder 20, the state is converted into a sample taking state in which the sample in a chamber 50 can be taken in, and a closed state in which a communication opening 21 is closed by a closing part 72 provided in the sampling part 70.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sample sampling device and a sample sampling method for earth pressure shield tunneling, and more particularly to a device and a method for collecting samples (soil, sand, etc.) to be used for plastic fluidity evaluation tests, etc., from inside the chamber of an earth pressure shield machine. [Background technology]

[0002] In the earth pressure shield tunneling method, the earth pressure necessary to stabilize the tunnel face must be maintained, and in order to discharge the appropriate amount of sample as the shield machine excavates, the excavated soil and sand taken into the chamber must have appropriate plastic fluidity and be waterproof to prevent groundwater from flowing into the chamber.

[0003] The stability of the tunnel face during the excavation of a shield machine is greatly affected by the properties of the excavated soil and sand in the chamber, so it is necessary to properly understand the properties of the excavated soil and sand. Various techniques for understanding the properties of the excavated soil and sand have been disclosed in the past for the earth pressure shield tunneling method (see, for example, Patent Document 1 and Patent Document 2).

[0004] The technology described in Patent Document 1 (Japanese Patent No. 6416496) relates to a method for measuring and evaluating the properties of excavated soil in a chamber used in earth pressure shield tunneling. This method for measuring and evaluating the properties of excavated soil in a chamber involves installing an earth pressure meter, a shear force meter, or a shear strain meter on the inner surface of the chamber, the surfaces of the mixing blades and fixed blades, and the back surface of the cutter facing the chamber, respectively, to measure the pressure, shear force, or shear strain acting on the inner surface of the chamber, the surfaces of the mixing blades and fixed blades, and the back surface of the cutter.

[0005] The technology described in Patent Document 2 (Japanese Patent No. 6522954) relates to a method for measuring and evaluating the properties of excavated soil in a chamber used in earth pressure shield tunneling. This method for measuring and evaluating the properties of excavated soil in a chamber used in earth pressure shield tunneling involves measuring the pressure and shear force acting on various parts of the chamber using an earth pressure meter and a shear force meter, and evaluating the properties of the mud in the chamber based on the measured values. Earth pressure meter and shear force meter are installed on the inner surface of the chamber, the surfaces of the mixing blades and fixed blades, and the back surface of the cutter facing the chamber, respectively, to measure the pressure and shear force acting on the inner surface of the chamber, the surfaces of the mixing blades and fixed blades, and the back surface of the cutter. The shear force meter is housed in a case.

[0006] Furthermore, although it is not a test device for evaluating the plastic flowability of excavated soil in a shield machine chamber, Patent Document 3 (Japanese Utility Model Publication No. 2-37913) discloses technology related to a measuring instrument mounting device for measuring earth pressure gauges, water pressure gauges, and other instruments for determining the condition of the ground at the tunneling face. This instrument mounting device for a shield machine forms an opening in the shield frame or bulkhead of the shield machine that connects the tunneling face side to the inside of the machine. A rotating body is provided in the opening, which is directly closed from the inside of the machine by a curved portion, and a measuring instrument such as an earth pressure gauge is attached to the curved surface of the rotating body. By rotating the rotating body, the measuring instrument is positioned inside the machine or at the opening. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6416496 [Patent Document 2] Patent No. 6522954 [Patent Document 3] Publication number 2-37913 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the technologies described in Patent Documents 1 and 2, the measuring instruments are directly attached to the equipment inside the chamber, which not only requires time and effort for maintenance and replacement, but in the worst case scenario, may make maintenance and replacement impossible. This makes it impossible to measure the force acting on each part inside the chamber from the sample and to reliably evaluate the properties of the sample inside the chamber based on the measured values. Even if the shear force meter is housed in a case, the case is installed inside the chamber, so the above-mentioned inconveniences cannot be resolved.

[0009] Furthermore, the technology described in Patent Document 3 mentioned above is intended to allow for easy replacement of measuring instruments such as earth pressure gauges or easy zero point adjustment without opening the tunnel face, and is not intended for sampling samples inside the chamber. Because earth pressure shield machines maintain earth pressure to stabilize the tunnel face, various measures are required to sample samples inside the chamber, and the technology described in Patent Document 3 cannot be applied as is.

[0010] The present invention has been proposed in consideration of the above-mentioned circumstances, and aims to provide a sample sampling device and a sample sampling method that can appropriately and easily collect samples from inside a chamber in an earth pressure shield tunneling method in order to test the plastic fluidity and other properties of the samples inside the chamber. [Means for solving the problem]

[0011] The sample sampling device and sample sampling method for an earth pressure shield tunneling method according to the present invention (hereinafter sometimes abbreviated as the sample sampling device and the sample sampling method) have the following features in order to achieve the above-mentioned object: That is, the sample sampling device and the sample sampling method according to the present invention relate to a device and a method for sampling a sample from inside the chamber of an earth pressure shield machine.

[0012] The sample sampling device of the present invention comprises a bulkhead opening provided in the bulkhead, a sample sampling device holding part attached to the inside side of the bulkhead opening on the shield machine side, and a sample sampling device main body attached rotatably to the sample sampling device holding part.

[0013] The sample sampling device holding section includes a communication opening that communicates with the bulkhead opening and a sliding recess provided inside the shield machine. The sample sampling device main body includes a sampling section that fits into the sliding recess and can rotate, and a rotation drive device that rotates the sampling section while it is fitted into the sliding recess. The sampling section also includes an intake opening that communicates with the communication opening, a closing section that closes the communication opening, and a sample recovery section that is detachable from the sampling section and takes in and recovers the sample through the intake opening.

[0014] In addition to the above-described configuration, the sampling unit may be provided with a pair of pivot shafts for pivotally supporting the sampling unit relative to the sliding recess. In such a configuration, the pivot drive devices are attached to link pieces extending from each of the pivot shafts.

[0015] In addition to the above-described configuration, it is possible to provide an anti-eruption mechanism for preventing eruption when recovering the sample.

[0016] In addition to the above-described configuration, it is possible to provide a rotation restricting portion that restricts the rotation range of the sampling portion that rotates by fitting into the sliding recess.

[0017] In addition to the above-described configuration, it is possible to provide a protective material injection device that injects a protective material (for example, grease) into the sliding surface between the sliding recess and the sampling part.

[0018] The sample sampling method according to the present invention comprises attaching a sample sampling device holder to the inside of a bulkhead opening provided in a bulkhead, and rotatably attaching a sampling device of a sample sampling device main body to the sample sampling device holder. Then, with the sampling device fitted in a sliding recess provided in the inside of the shield machine of the sample sampling device holder, the rotation drive device is used to rotate the sampling device, thereby converting the bulkhead opening in the bulkhead, the communication opening in the sample sampling device holder, and the intake opening in the sampling device as a series between a sample intake state in which the sample can be taken into the sample recovery section provided in the sampling section, and a closed state in which the closing part provided in the sampling section closes the communication opening in the sample sampling device holder.

[0019] In addition to the above-described configuration, the sampling unit is provided with a pair of rotation shafts for rotatably supporting the sampling unit relative to the sliding recess, and a rotation drive device is attached to each of the link pieces extending from each rotation shaft. By driving the rotation drive device, the sampling unit can be rotated while fitted into the sliding recess.

[0020] In addition to the above-mentioned configuration, The sample collection section is opened from the intake opening in the sampling section. The fluid is filled in between. All of the fluid (filled between the intake opening and the sample recovery section) flowed out from the water supply pipe connected to the inside of the shield machine in the sample recovery section. In this case, it is possible to determine that sampling of the sample has been completed.

[0021] In addition to the above-described configuration, it is possible to implement anti-eruption measures to prevent eruptions when the sample is being taken in.

[0022] In addition to the above-mentioned configuration, it is possible to inject a protective material (for example, grease) into the sliding surface between the sliding recess and the sampling part. [Effects of the Invention]

[0023] According to the sample sampling device and sample sampling method for the earth pressure shield tunneling method of the present invention, a sample sampling device holder is attached to a bulkhead opening provided in a bulkhead, and a sampling portion of the sample sampling device main body is attached to the sample sampling device holder. Rotatable By attaching the sampling unit to the bulkhead and rotating the sampling unit using a rotary drive device, it can be converted into a closed state in which the bulkhead opening is blocked, and into an intake state in which a sample (soil) can be taken in through the bulkhead opening.

[0024] That is, by keeping the bulkhead opening closed at all times and setting it to the sample intake state only when sampling is required, it becomes possible to appropriately and easily collect samples from inside the chamber. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 2 is an explanatory diagram of a sample sampling device according to an embodiment of the present invention, as viewed from the side. [Figure 2] FIG. 2 is an explanatory diagram of a sample sampling device according to an embodiment of the present invention, viewed from the inside of a shield machine. [Figure 3] FIG. 10 is an explanatory side view of the closed state of the bulkhead opening in the sample sampling device according to the embodiment of the present invention. [Figure 4] FIG. 2 is a side view illustrating the state in which a sample is taken in by the sample sampling device according to the embodiment of the present invention. [Figure 5] 1 is an explanatory diagram of a shield machine to which a sample sampling device according to an embodiment of the present invention is applied, viewed from the face side. [Figure 6] 1 is an explanatory diagram showing a sample sampling procedure using a sample sampling device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a sample sampling device and a sample sampling method for an earth pressure shield tunneling method according to an embodiment of the present invention will be described with reference to the drawings. Figures 1 to 6 explain the sample sampling device and the sample sampling method according to an embodiment of the present invention, with Figure 1 being an explanatory diagram of the sample sampling device as seen from the side, Figure 2 being an explanatory diagram of the sample sampling device as seen from the inside of the shield machine, Figure 3 being an explanatory diagram of the sample sampling device in a closed state as seen from the side, Figure 4 being an explanatory diagram of the sample intake state in the sample sampling device as seen from the side, Figure 5 being an explanatory diagram of the shield machine to which the sample sampling device is applied as seen from the face side, and Figure 6 being an explanatory diagram showing the sample sampling procedure.

[0027] <Outline of the sample sampling device> The sample sampling device 200 of this embodiment has as its main components a bulkhead opening 10 provided in the bulkhead 60, a sample sampling device holding unit 20 attached to the inside of the shield machine of the bulkhead opening 10, and a sample sampling device main body 30 (sampling unit 70) attached rotatably to the sample sampling device holding unit 20.

[0028] <Bulkhead opening> An earth pressure shield machine excavates the ground using a cutterhead 40, and in order to maintain the earth pressure to prevent the tunnel face from collapsing, a chamber 50 is provided, which is a space filled with earth and sand. A bulkhead 60 (partition wall) is installed between this chamber 50 and the inside of the shield machine. As shown in Figures 1, 3, and 4, the bulkhead opening 10 is a sample passage hole that penetrates the bulkhead 60, connecting the inside of the chamber 50 with the inside of the shield machine and allowing samples to be taken, and earth and sand samples can be taken from inside the bulkhead 60 through this bulkhead opening 10.

[0029] In this embodiment, as shown in Fig. 5, bulkhead openings 10 are provided in two locations, one on the top and one on the side (the right side when viewed from the face side) of the bulkhead 60, and a sample sampling device 200 is attached to the inside of the shield machine of these bulkhead openings 10. The position of the bulkhead openings 10 and the attachment position of the sample sampling device 200 can be changed as appropriate depending on the diameter of the shield machine, the ground conditions to be excavated, etc.

[0030] <Sample sampling device holder> The bulkhead opening 10 is opened and closed by the sample sampling device main body 30. As shown in Figures 1 to 4, the device for opening and closing the bulkhead opening 10 is composed of a sample sampling device holder 20 and the sample sampling device main body 30. That is, the sample sampling device holder 20 is a member for rotatably holding the sampling unit 70 of the sample sampling device main body 30. The sample sampling device holder 20 has a communication opening 21 that communicates with the bulkhead opening 10 provided in the bulkhead 60, and a sliding recess 22 that rotatably holds the sampling unit 70 of the sample sampling device main body 30.

[0031] <Communication opening> 1, 3, and 4, the communication opening 21 is a sample passage hole that communicates with the bulkhead opening 10 provided in the bulkhead 60, thereby allowing the sample to be taken in from inside the bulkhead 60 to the sampling section 70 of the sample sampling device main body 30. This communication opening 21 is designed to be opened and closed by rotating the sampling section 70 of the sample sampling device main body 30.

[0032] <Sliding recess> 1, 3, and 4, the sliding recess 22 is provided inside the shield machine so as to surround the communication opening 21. In this embodiment, the inner peripheral surface of the sliding recess 22 is an arc-shaped recess. The outer peripheral surface of the sampling part 70 of the sample sampling device main body 30 is an arc-shaped protrusion that matches the shape of the inner peripheral surface of the sliding recess 22 and fits into the sliding recess 22. This allows the sampling part 70 to fit into the sliding recess 22 and rotate (slide).

[0033] <Rotation restriction part> As shown in FIGS. 1, 3, and 4, the rotation restricting portion 23 is a member for restricting the rotation range of the sampling unit 70, which rotates while fitting into the sliding recess 22. In this embodiment, the rotation restricting portion 23 comprises a first restricting protrusion 23a and a second restricting protrusion 23b for restricting the rotation position of the sampling unit 70. For ease of illustration, only one of the restricting protrusions is shown in each figure, and the other restricting protrusion is omitted. That is, FIGS. 1 and 4 schematically illustrate the first restricting protrusion 23a, and FIG. 3 schematically illustrates the second restricting protrusion 23b. Similarly to FIGS. 1, 3, and 4, both the first restricting protrusion 23a and the second restricting protrusion 23b are provided in FIG. 6. The first restricting protrusion 23a and the second restricting protrusion 23b are attached to the bulkhead 60 or the like using a support member (not shown) or the like.

[0034] The first restricting protrusion 23a is a member that prevents further rotation of the sampling unit 70 when the sampling unit 70 rotates to a sample intake state in which the bulkhead opening 10 provided in the bulkhead 60, the communicating opening 21 provided in the sample sampling device holding unit 20, and the intake opening 71 provided in the sampling unit 70 are connected together and the sample can be taken into the sample recovery unit 73 provided in the sampling unit 70. The second restricting protrusion 23b is a member that prevents further rotation of the sampling unit 70 when the sampling unit 70 rotates to a closed state in which the closing unit 72 provided in the sampling unit 70 closes the communicating opening 21 provided in the sample sampling device holding unit 20.

[0035] That is, the rotation restricting section 23 restricts the rotation range of the sampling section 70 by providing restricting protrusions 23a, 23b at both ends of the rotation range of the sampling section 70. The first restricting protrusion 23a and the second restricting protrusion 23b are members that come into contact with the end faces of the sampling section 70 when the sampling section 70 has rotated to its respective restricting positions, thereby preventing the sampling section 70 from rotating any further.

[0036] As will be explained in detail later, the rotation restricting unit 23 may be configured by restricting the rotation drive range of the rotation drive device 80 that rotates the sampling unit 70. For example, if the rotation drive device 80 is a hydraulic jack, the rotation range of the sampling unit 70 can be restricted by restricting the jack stroke of the hydraulic jack (the amount of protrusion of the piston 82). Also, either the restricting protrusions 23a, 23b or the hydraulic jack may function as the rotation restricting unit 23, or both the restricting protrusions 23a, 23b and the hydraulic jack may function as the rotation restricting unit 23.

[0037] <Packing material> A packing member 24 is provided in the sample sampling device holding portion 20 so as to face the communication opening 21. The packing member 24 is, for example, a ring-shaped member made of rubber, which abuts against the outer peripheral surface of the sampling portion 70 to close the gap between the inner peripheral surface of the sliding recess 22 and the outer peripheral surface of the sampling portion 70.

[0038] <Sample sampling device body> 1, 3, and 4, the sample sampling device main body 30, together with the sample sampling device holding part 20, is a major component of the sample sampling device 200. This sample sampling device main body 30 is equipped with a sampling part 70 that is rotatable while fitted into the sliding recess 22, and a rotation drive device 80 that rotates the sampling part 70 while fitted into the sliding recess 22.

[0039] <Sampling section> The sampling section 70 is a component for sampling soil and sand in the chamber 50 as a sample, and is equipped with an intake opening 71 that communicates with the communication opening 21, a blocking section 72 that blocks the communication opening 21, and a sample recovery section 73 that is detachable from the sampling section 70 and that takes in and recovers the sample from the intake opening 71.

[0040] As described above, the sample sampling device holding part 20 is provided with a sliding recess 22 that rotatably holds the sampling part 70 of the sample sampling device main body 30, and the sampling part 70 is rotatably held by the sample sampling device holding part 20. The sliding recess 22 in this embodiment has an inner circumferential surface that is an arc-shaped recess.

[0041] For this reason, the sampling unit 70 of this embodiment has an arc-shaped convex outer surface that fits into the sliding recess 22. A storage recess 74 for storing an apparatus used for sampling the sample is provided inside the sampling unit 70. The apparatus to be stored in the storage recess 74 comprises a cylindrical sample recovery unit 73, a flange 73a provided at the tip end (the end on the intake opening 71 side) of the sample recovery unit 73, and a bolt insertion hole 73b provided in the flange 73a; these devices form part of the sample sampling device 200.

[0042] A sealing portion 75, to which the flange 73a abuts, is provided on the communication opening 21 side of the storage recess 74 provided in the sampling portion 70, and a bolt screw hole 75a is provided in this sealing portion 75. Therefore, the flange 73a provided in the sample recovery portion 73 is tightly attached to the sealing portion 75 provided in the storage recess 74. together The bolt insertion hole 73b and the bolt screw hole 75a are connected together, and by inserting a bolt 76 into the bolt insertion hole 73b and screwing the tip of the bolt 76 into the bolt screw hole 75a, the sample recovery section 73 can be attached to the storage recess 74. Although not shown, the outer peripheral surface of the shaft of the bolt 76 has a male thread, and the inner peripheral surface of the bolt screw hole 75a has a female thread into which the male thread of the bolt 76 is screwed.

[0043] Then, when the sampling section 70 is rotated to enter the sample intake state, the bulkhead opening 10, the communicating opening 21 provided in the sample sampling device holding section 20, and the intake opening 71 provided in the sampling section 70 become connected, allowing the sample to be taken into the sample recovery section 73 provided in the sampling section 70.

[0044] <Intake opening> The intake opening 71 is provided in the storage recess 74 of the sampling unit 70 and can be communicated with the communication opening 21 of the sample sampling device holding unit 20. In addition, the communication opening 21 of the sample sampling device holding unit 20 can be communicated with the bulkhead opening 10.

[0045] Therefore, by arranging the bulkhead opening 10, the communication opening 21, and the intake opening 71 in a series from the bulkhead 60 side toward the sampling section 70, the soil (sample) in the chamber 50 can be taken into the sample recovery section 73 of the sampling section 70.

[0046] <Occluded part> The blocking portion 72 is formed by the outer peripheral surface of the sampling portion 70 excluding the intake opening 71. In other words, the outer peripheral surface of the sampling portion 70 excluding the intake opening 71 has an area large enough to block the communication opening 21 of the sample sampling device holder 20. When the sampling portion 70 is rotated so that the communication opening 21 provided in the sample sampling device holder 20 is blocked by the blocking portion 72, the bulkhead opening 10 and the communication opening 21 provided in the sample sampling device holder 20 can be blocked. In this state, the interior of the chamber 50 is not in communication with the interior of the shield machine. When soil (sample) is not being taken in from the chamber 50, the communication opening 21 is blocked and excavation using the shield machine is performed.

[0047] <Sample recovery section> The sample recovery section 73 is a cylindrical member for taking in a sample from the intake opening 71. As described above, one end of the sample recovery section 73 (the chamber 50 side) is an open end that communicates with the intake opening 71, and this open end is provided with a flange 73a. Meanwhile, a water supply pipe 90 is attached to the other end of the sample recovery section 73 (the interior side of the shield machine). The water supply pipe 90 connects the bulkhead opening 10, the communication opening 21, and the intake opening 71 together, and is a pipe for extracting fluids (air and water) from the sample recovery section 73 and sending water into the sampling section 70 when taking in soil (sample) from the chamber 50 into the sample recovery section 73 of the sampling section 70. A water supply pump 93 is attached to the terminal end of this water supply pipe 90, so that water can be sent into the sample recovery section 73.

[0048] Although not shown, the water supply pump 93 and the water supply pipe 90 are detachably connected by a hose joint or the like. The water supply pipe 90 is provided with an on-off valve 91, which is opened and closed by an operating handle 92. The on-off valve 91 may also be configured as a solenoid valve or the like. As shown in Figures 4 and 6(b), the water supply pipe 90 may be provided with two on-off valves 91 (a first on-off valve 91a and a second on-off valve 91b) connected in series. As will be described in detail later, the first on-off valve 91a and the second on-off valve 91b connected in series to the water supply pipe 90 function as an eruption prevention mechanism.

[0049] <Rotation axis> A rotation shaft 31 is provided on the outer peripheral surface of the sampling part 70 for rotating the sample sampling device main body 30 within the sliding recess 22 by rotatably fixing the sampling part 70 to the sample sampling device holding part 20. As shown in Figure 2, these rotation shafts 31 are provided on both sides of the outer peripheral surface of the sample sampling device main body 30 so as to be aligned in a straight line. Each rotation shaft 31 has an extending link piece 83 for attaching the drive part of the rotation drive device 80 (for example, the tip of the piston 82).

[0050] <Rotational drive device> The rotation drive device 80 is a device for rotating the sampling unit 70 while it is fitted into the sliding recess 22, and in this embodiment, as shown in FIG. 2 , is composed of a hydraulic pump (not shown), a cylinder 81, and a piston 82. Link pieces 83 extending from a pair of rotation shafts 31 provided on the sampling unit 70 are each attached to a drive unit of the rotation drive device 80 (for example, the tip of the piston 82). Therefore, when the rotation drive device 80 is driven, a driving force is transmitted to the link pieces 83, and the sampling unit 70 rotates while fitted into the sliding recess 22, with each rotation shaft 31 serving as a rotation fulcrum.

[0051] 2, in the present invention, a rotary shaft 31 is provided on each side of the outer circumferential surface of the sampling unit 70, and a drive part of the rotary drive device 80 (for example, the tip of a piston 82) is attached to each link piece 83 extending from each rotary shaft 31. This allows force to be applied evenly to the rotary shaft 31, preventing mechanical damage.

[0052] Although not shown, a pressure gauge is attached to the hydraulic jack to measure the jack pressure. This allows the force under load and no load to be ascertained, making it possible to predict machine wear and tear and prevent malfunctions before they occur.

[0053] <Protective material injection device> 1, 3, and 4, the protective material injection device 100 is a device for injecting a protective material into the sliding surface between the sliding recess 22 and the sampling unit 70 of the sample sampling device main body 30. This protective material injection device 100 comprises a protective material transport pipe 101, an on-off valve 102, and a protective material delivery device 103. The protective material transport pipe 101 penetrates the interior of the sample sampling device holding unit 20, with its tip opening into the sliding recess 22, and its base end connected to the protective material delivery device 103 via the on-off valve 102. Furthermore, the on-off valve 102 is provided with an on-off handle 104. The protective material, such as grease, is injected between the inner circumferential surface of the sliding recess 22 and the outer circumferential surface of the sampling unit 70 to protect the sliding surface.

[0054] Incidentally, in order to perform stable shield excavation, soil (sample) sampling using the sample sampling device 200 of the present invention is performed, for example, several tens to several hundreds of times at one site. Therefore, by providing the protective material injection device 100, the sliding surfaces are protected and mechanical damage is prevented in advance. In this regard, although the testing device described in Patent Document 3 also states that grease may be applied to the sliding surfaces, since the device slides only once or twice at one site, there is no need to provide the protective material injection device 100, and grease can be applied to the sliding surfaces during maintenance.

[0055] <Operation of the sample sampling device> In the sample sampling device 200 of the present invention, by rotating the sampling section 70 to the sample intake position, the bulkhead opening 10, the communicating opening 21 provided in the sample sampling device holding section 20, and the intake opening 71 provided in the sampling section 70 are connected in series, thereby achieving a sample intake state in which sediment (sample) can be taken into the sample recovery section 73 provided in the sampling section 70. In addition, by rotating the sampling section 70 to the closed position, the closing section 72 provided in the sampling section 70 can be used to close the communicating opening 21 provided in the sample sampling device holding section 20, thereby achieving a closed state.

[0056] <Sample Sampling Method> The sampling method according to the present invention is a method for sampling soil (sample) from inside the chamber 50 of an earth pressure shield machine using the above-described sampling device 200. The sampling method will be described below with reference to Fig. 6. In Fig. 6, soil (sample) is sampled by operating the sampling device 200 in the order of (a), (b), (c), and (d).

[0057] <Basic steps of sample sampling method> The sample sampling method according to the present invention basically comprises a step of attaching the sampling device holder 20 and the sampling device main body 30 to the bulkhead 60 (attachment step), and a step of rotating the sampling unit 70 provided on the sample sampling device main body 30 (rotation step). The attachment step is a step of attaching the sample sampling device holder 20 to the inside of the shield machine at the bulkhead opening 10, and rotatably attaching the sampling unit 70 of the sample sampling device main body 30 within the sliding recess 22 of the sample sampling device holder 20.

[0058] The rotation step is a step in which, with the sampling unit 70 fitted into the sliding recess 22 provided on the inside of the shield machine of the sample sampling device holding unit 20, the rotation drive device 80 is used to rotate the sampling unit 70 to set the bulkhead opening 10, the communication opening 21, and the intake opening 71 in a continuous state, and to set the communication opening 21 provided in the sample sampling device holding unit 20 in a closed state where it is closed by the closing unit 72. In other words, by rotating the sampling unit 70 with the sampling unit 70 fitted into the sliding recess 22, it is possible to switch between the sample taking-in state and the closed state.

[0059] <Method for collecting samples> During the rotation process described above, the blocking section 72 provided in the sampling section 70 is always in a blocked state, blocking the communication opening 21 provided in the sample sampling device holder 20 (FIG. 6(a)). The bulkhead opening 10, the communication opening 21 provided in the sample sampling device holder 20, and the intake opening 71 provided in the sampling section 70 are connected in series, thereby creating a sample intake state in which sediment (sample) can be taken into the sample recovery section 73 provided in the sampling section 70 (FIG. 6(b)).

[0060] When the sampling unit 70 is filled with soil (sample) in the sample intake state, the closing unit 72 provided in the sampling unit 70 closes the communication opening 21 provided in the sample sampling device holding unit 20 (Fig. 6(c)). Then, the bolt 76 connecting the flange 73a of the sample recovery unit 73 to the sealing unit 75 provided on the bottom surface of the storage recess 74 is removed, and the sample recovery unit 73 is removed from the storage recess 74 (Fig. 6(d)). This allows the soil (sample) taken into the sample recovery unit 73 to be recovered.

[0061] <Methods to prevent eruptions> Because there is a difference in pressure between the chamber 50 and the inside of the shield machine, separated by the bulkhead 60, if the chamber 50 and the inside of the shield machine are suddenly connected, there is a risk that the soil and sand that has filled the chamber 50 will erupt into the inside of the shield machine.

[0062] Therefore, in this embodiment, as a method for preventing eruptions, a fluid (e.g., water) is filled between the intake opening 71 and the sample recovery section 73 of the sampling section 70, and it is determined that the sampling of the sample has finished when there is no more fluid (e.g., water) flowing out from the sampling section 70. In other words, a fluid (e.g., water) is filled between the intake opening 71 and the sample recovery section 73 of the sampling section 70, and it is determined that the sampling of the sediment (sample) has finished when all of the fluid (e.g., water) has flowed out from the water supply pipe 90 connected in communication with the sample recovery section 73.

[0063] As shown in Figure 6(b), two on-off valves 91 are provided in series in the water supply pipe 90. A method for preventing eruptions will be described below, with each on-off valve 91 being a first on-off valve 91a provided on the sample recovery section 73 side and an on-off valve 91b provided at the rear of the water supply pipe 90. When sampling soil and sand (sample), the sampling section 70 is filled with water.

[0064] Before sample sampling begins, both the first on-off valve 91a and the second on-off valve 91b are closed. Then, by opening the first on-off valve 91a and keeping the second on-off valve 91b closed, the water supply pipe 90 located between the first on-off valve 91a and the second on-off valve 91b is filled with water (step A). ​​Next, by closing the first on-off valve 91a and opening the second on-off valve 91b, the water filling the space between the first on-off valve 91a and the second on-off valve 91b is released to atmospheric pressure. At this time, the water flowing out of the water supply pipe 90 is collected in an appropriate container (step B).

[0065] By repeatedly performing the above-described (Step A) and (Step B), the water filling the sampling section 70 flows out, and the sediment (sample) can be taken into the sample recovery section 73. In this way, by repeatedly opening and closing the first on-off valve 91a and the second on-off valve 91b, the difference between the sediment pressure in the chamber 50 and the atmospheric pressure can be eliminated, and an eruption can be prevented.

[0066] <Method for stable rotation of the sampling unit> In this embodiment, as a method for stably rotating the sampling unit 70, a pair of rotation shafts 31 are provided in the sampling unit 70 to rotatably support the sampling unit 70 relative to the sliding recess 22, and a rotation drive device 80 is attached to each link piece 83 extending from each rotation shaft 31. Then, by driving the rotation drive device 80, the sampling unit 70 is rotated while fitted into the sliding recess 22, and a force is applied equally to each rotation shaft 31, allowing the sampling unit 70 to rotate stably.

[0067] <Method for protecting the sliding surface> In this embodiment, as a method for protecting the sliding surface, a protective material injection device 100 is used to inject a protective material (e.g., grease) into the sliding surface between the sliding recess 22 and the sampling part 70 at appropriate times. This protects the sliding surface and prevents mechanical damage. [Explanation of symbols]

[0068] 10 Bulkhead opening 20. Sample sampling device holder 21 Communication opening 22 Sliding recess 23 Rotation control part 23a First restricting protrusion 23b Second restriction protrusion 24 Packing material 30. Sample sampling device body 31 Rotating shaft 40 cutter head 50 chambers 60 Bulkhead 70 Sampling section 71 Intake opening 72 Occlusion 73 Sample Recovery Section 73a flange 73b Bolt insertion hole 74 Storage recess 75 Sealed part 75a Bolt screw hole 76 volts 80 Rotation drive device 81 cylinders 82 Piston 83 Link piece 90 Water Pipe 91 On-off valve 91a First shut-off valve 92b Second on-off valve 92 Operation handle 93 Water Pump 100 Protective material injection device 101 Protective material transport pipe 102 On-off valve 103 Protective material delivery device 104 Opening and closing handle 200 Sample Sampling Device

Claims

1. An apparatus for sampling samples from inside a chamber of an earth pressure shield machine, a bulkhead opening provided in the bulkhead; a sample sampling device holder attached to the inside of the shield machine at the bulkhead opening; a sample sampling device body rotatably attached to the sample sampling device holding portion; Equipped with The sample sampling device holder includes: a communication opening communicating with the bulkhead opening; A sliding recess provided inside the shield machine; Equipped with The sample sampling device body includes: a sampling part that is fitted into the sliding recess and is rotatable; a rotation drive device that rotates the sampling unit while it is fitted in the sliding recess; Equipped with The sampling unit an intake opening communicating with the communication opening; a closing portion that closes the communication opening; a sample recovery unit that is detachable from the sampling unit and that takes in and recovers a sample through the intake opening; A sample sampling device for an earth pressure shield tunneling method, comprising:

2. the sampling unit is provided with a pair of rotation shafts for rotatably supporting the sampling unit with respect to the sliding recess; The rotation drive devices are attached to link pieces extending from the respective rotation shafts.

2. A sample sampling device for an earth pressure shield tunneling method according to claim 1.

3. The sample recovery unit is provided with an anti-eruption mechanism for preventing eruptions when recovering a sample.

3. A sample sampling device for an earth pressure shield tunneling method according to claim 1 or 2.

4. a rotation restricting portion that restricts the rotation range of the sampling portion that is fitted into the sliding recess and rotates; 3. A sample sampling device for an earth pressure shield tunneling method according to claim 1 or 2.

5. a rotation restricting portion that restricts the rotation range of the sampling portion that is fitted into the sliding recess and rotates; 4. A sample sampling device for an earth pressure shield tunneling method according to claim 3.

6. a protective material injection device for injecting a protective material into the sliding surface between the sliding recess and the sampling part; 3. A sample sampling device for an earth pressure shield tunneling method according to claim 1 or 2.

7. a protective material injection device for injecting a protective material into the sliding surface between the sliding recess and the sampling part; 4. A sample sampling device for an earth pressure shield tunneling method according to claim 3.

8. a rotation restriction part that restricts the rotation range of the sampling part that rotates by fitting into the sliding recess; a protective material injection device that injects a protective material into the sliding surface between the sliding recess and the sampling part; 3. A sample sampling device for an earth pressure shield tunneling method according to claim 1, further comprising:

9. a rotation restriction part that restricts the rotation range of the sampling part that rotates by fitting into the sliding recess; a protective material injection device that injects a protective material into the sliding surface between the sliding recess and the sampling part; 4. A sample sampling device for an earth pressure shield tunneling method according to claim 3, further comprising:

10. A method for sampling a sample from within a chamber of an earth pressure shield machine, comprising: a sample sampling device holder attached to the inside of the shield machine of a bulkhead opening provided in the bulkhead, and a sampling unit of the sample sampling device body rotatably attached to the sample sampling device holder; The sampling unit is fitted into a sliding recess provided on the inside of the shield machine of the sample sampling device holding unit, and the sampling unit is rotated using a rotation drive device, the bulkhead opening, the communicating opening provided in the sample sampling device holding section, and the intake opening provided in the sampling section are connected together to switch between a sample intake state in which the sample can be taken into the sample recovery section provided in the sampling section, and a closed state in which the connecting opening provided in the sample sampling device holding section is closed by the closing section provided in the sampling section; A sample sampling method for an earth pressure shield tunneling method, characterized in that

11. a pair of rotation shafts are provided in the sampling unit to rotatably support the sampling unit relative to the sliding recess, and the rotation drive devices are attached to link pieces extending from the rotation shafts, respectively; the sampling unit is rotated by driving the rotation drive device while the sampling unit is fitted into the sliding recess.

11. A sample sampling method for an earth pressure shield tunneling method according to claim 10.

12. A fluid is filled between the intake opening provided in the sampling section and the sample recovery section, and when all of the fluid flows out from the water supply pipe connected to the inside of the shield machine of the sample recovery section, it is determined that the sampling of the sample has been completed.

12. A method for sampling samples in an earth pressure shield tunneling method according to claim 10 or 11.

13. In the sample intake state, an anti-eruption measure is taken to prevent eruption.

12. A method for sampling samples in an earth pressure shield tunneling method according to claim 10 or 11.

14. In the sample intake state, an anti-eruption measure is taken to prevent eruption.

13. A method for sampling samples in an earth pressure shield tunneling method according to claim 12.

15. Injecting a protective material into the sliding surface between the sliding recess and the sampling part.

12. A method for sampling samples in an earth pressure shield tunneling method according to claim 10 or 11.

16. Injecting a protective material into the sliding surface between the sliding recess and the sampling part.

13. A method for sampling samples in an earth pressure shield tunneling method according to claim 12.

17. In the sample intake state, taking measures to prevent eruption to prevent eruption; Injecting a protective material into the sliding surface between the sliding recess and the sampling part.

12. A method for sampling samples in an earth pressure shield tunneling method according to claim 10 or 11.

18. In the sample intake state, taking measures to prevent eruption to prevent eruption; Injecting a protective material into the sliding surface between the sliding recess and the sampling part.

13. A method for sampling samples in an earth pressure shield tunneling method according to claim 12.

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