JP2010013895A - Measuring device for sediment property in chamber and shield excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set injection rate of additive to be poured into a chamber properly by measuring properties of sediment in the chamber accurately by a simple configuration. <P>SOLUTION: This measuring device measures properties of sediment in the chamber 6 formed between a cutter head 4 and a bulk head 5 of the shield excavator 1. The bulk head 5 includes a rod-like member 19 supported in the chamber 6 to come in and out freely, an axial direction earth pressure gauge 36 arranged at a tip of the rod-like member 19 to measure pressure in the axial direction of the rod-like member 19, and a sediment property computing means 38 for obtaining properties of the sediment in the chamber 6 based on travel speed of the rod-like member 19 when inserting the rod-like member 19 into the sediment in the chamber 6 and the values measured by the axial direction earth pressure gauge 36. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a chamber earth and sand property measuring apparatus and a shield machine.

  In the shield machine, a tunnel is constructed by excavating a natural ground with a rotary cutter provided in front of the shield body and sequentially assembling segments behind it. A plurality of bits are arranged at the front end of the rotary cutter, and the rotary cutter is rotated to excavate natural ground with the bits.

  The mud pressure shield machine injects additive material into the chamber formed between the rotary cutter and the bulkhead provided near the front end of the shield body, and the soil (excavated soil) in the chamber is used as the additive material. It mixes and gives moderate fluidity to the earth and sand in a chamber.

  In the mud pressure shield machine, the property (hardness) of the earth and sand in the chamber varies particularly depending on the amount of additive material injected into the chamber. Moreover, the property (hardness) of the earth and sand in the chamber is also affected by the digging speed of the shield machine, the rotational speed of the rotary cutter, the material of the additive, the injection position of the additive, and the like.

  Patent Document 1 discloses a technique for rotating the rotating plate in the chamber and estimating the flow direction and size of the sediment in the chamber from the rotational resistance of the rotating plate with respect to the sediment in the chamber. .

  Further, Patent Document 1 discloses a technique for installing a measurement rod in a chamber and estimating the flow direction and size of the sediment in the chamber from the amount of deformation of the measurement rod when the sediment in the chamber flows. It is disclosed.

JP 2007-191878 A

  However, in the method of measuring sediment flow from the rotational resistance of the rotating plate of Patent Document 1, a device for rotating the rotating plate is required, and the structure becomes complicated. Moreover, in the thing which measures sediment flow from the deformation | transformation amount of the measurement rod of patent document 1, there exists a possibility that the deformation | transformation of a measurement rod and the flow direction of earth and sand may not necessarily correspond, and the sediment flow in a chamber cannot be measured accurately. is there.

  Accordingly, an object of the present invention is to measure the sediment property in the chamber, which can appropriately set the injection amount of the additive to be injected into the chamber by accurately measuring the property of the sediment in the chamber with a simple configuration. It is to provide a device and a shield machine.

  In order to achieve the above object, an invention according to claim 1 is an apparatus for measuring sediment properties in a chamber formed between a cutter head and a bulk head of a shield machine, wherein the bulk head includes the chamber. A rod-like member supported so as to freely move in and out, an axial earth pressure gauge disposed at the tip of the rod-like member for measuring the axial pressure of the rod-like member, and the rod-like member penetrating into the earth and sand in the chamber A sediment property measuring apparatus in the chamber, comprising: a sediment property calculating means for determining the sediment property in the chamber based on the moving speed of the rod-shaped member and the measured value of the axial earth pressure gauge. is there.

  According to a second aspect of the present invention, the earth and sand property calculating means is configured to determine whether or not the rod-shaped member is inserted into the earth and sand in the chamber at a constant moving speed based on the measured value of the axial earth pressure gauge. 2. The in-chamber sediment property measuring apparatus according to claim 1, wherein the sediment property is obtained.

  According to a third aspect of the present invention, the earth and sand property calculating means calculates the earth and sand property in the chamber based on the moving speed of the rod member when the rod member is penetrated into the earth and sand in the chamber at a constant pressure. The in-chamber sediment property measuring apparatus according to claim 1 to be obtained.

  The invention of claim 4 is a shield machine equipped with the in-chamber sediment property measuring device according to any one of claims 1 to 3, wherein the sediment property in the chamber is obtained by the sediment property calculating means. Accordingly, there is provided a shield machine having an additive injection amount determining means for determining an injection amount of the additive injected into the chamber.

  According to the present invention, it is possible to accurately set the amount of additive to be injected into the chamber by accurately measuring the property of the earth and sand in the chamber with a simple configuration.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a side sectional view of a shield machine according to an embodiment of the present invention. 2 is a view taken along the line II-II in FIG.

  As shown in FIGS. 1 and 2, the shield machine 1 includes a substantially cylindrical shield body 2 and a rotary cutter 3 that is rotatably provided at the front of the shield body 2 and excavates a circular cross section. Yes.

  At the rear part of the shield body 2, a plurality of erectors (not shown) for assembling the segments in the holes excavated by the rotary cutter 3 and constructing a tunnel are provided on the inner periphery of the shield body 2 at a predetermined interval. A shield jack (not shown) for propelling the shield body 2 by taking a reaction force on the segment is provided.

  Between the rotary cutter 3 (cutter head 4) and the bulkhead (partition wall) 5 provided in the vicinity of the front end of the shield body 2, a chamber 6 for taking in the earth and sand (excavated earth and sand) excavated by the rotary cutter 3 is formed. Is done. A screw conveyor 7 that passes through the bulkhead 5 and opens into the chamber 6 is provided below the bulkhead 5.

  The rotary cutter 3 is rotatably provided on the bulkhead 5. The rotary cutter 3 has a cutter head 4 that extends radially outward from the center of rotation and is rotated about an axis parallel to the excavation direction. On the front surface of the cutter head 4, a center bit 8 is disposed at the center in the radial direction, and a plurality of cutter bits 9 are disposed on the outer peripheral side of the center bit 8. The cutter head 4 may be formed in a spoke shape or a face plate shape.

  On the rear surface of the cutter head 4, a plurality of stirring blades (rotating stirring blades) 10 are provided to extend rearward in the digging direction and stir the earth and sand in the chamber 6. A plurality of stirring blades (fixed stirring blades) 11 extending forward and stirring the earth and sand in the chamber 6 are provided (see FIG. 1).

  In addition, an additive material inlet 12 of an additive material injection pipe for injecting the additive material into the chamber 6 is opened in front of the cutter head 4. In this embodiment, the additive inlet 12 is provided in the center part of the cutter head 4, the radial direction intermediate part of the cutter head 4, and the outer peripheral part of the cutter head 4 (refer FIG. 1).

  A ring-shaped member 14 having a gear 13 is rotatably supported on the bulkhead 5. The ring-shaped member 14 is connected to the cutter head 4 by a plurality of intermediate beams 15 extending rearward in the digging direction from the cutter head 4 of the rotary cutter 3. A plurality of intermediate beams 15 are provided at predetermined intervals in the circumferential direction of the rotary cutter 3. A plurality of drive motors 16 for rotating the ring-shaped member 14 are provided in the shield body 2. A pinion 17 is attached to the drive motor 16, and the pinion 17 meshes with a gear 13 provided on the ring-shaped member 14.

  In order to dig using the shield machine 1, the rotary cutter 3 (cutter head 4) is rotated by the drive motor 16 while pushing the existing segment with the shield jack. As a result, the natural ground is excavated while the shield machine 1 is propelled forward.

  At this time, the earth and sand excavated by the rotary cutter 3 flows into a chamber 6 formed between the cutter head 4 and the bulkhead 5. In this chamber 6, the stirring blade (rotary stirring blade) 10 is rotating with the rotation of the rotary cutter 3 (cutter head 4), and the earth and sand in the chamber 6 is sequentially carried out into the mine behind the bulkhead 5 by the screw conveyor 7. Is done.

  The shield machine 1 according to the present embodiment includes an in-chamber soil property measuring apparatus 18 that measures the sediment property in the chamber 6.

  FIG. 3 is a side cross-sectional view of the in-chamber sediment property measuring apparatus according to one embodiment of the present invention. FIG. 4 is a side cross-sectional view of the in-chamber sediment property measuring apparatus, and shows a state in which a bar-like member is inserted into the chamber. FIG. 5 is a view taken along the line VV in FIG. 6 is a view taken along the line VI-VI in FIG. 7 is a view taken along the line VII-VII in FIG. 8 is a view taken along the line VIII-VIII in FIG.

  As shown in FIGS. 3 to 8, the in-chamber sediment property measuring apparatus 18 of the present embodiment includes a bar-like member 19 that is supported by the bulkhead 5 so as to be able to move in and out of the chamber 6 and to be rotatable, and a bar-like member 19. And an orthogonal earth pressure gauge 20 that measures a pressure in a direction perpendicular to the longitudinal direction of the rod-shaped member 19, and a plurality of actuators that are disposed on the side surface of the rod-shaped member 19 at intervals in the circumferential direction. Sediment flow calculation means for determining the flow direction of sediment in the chamber 6 based on the measured values of the respective orthogonal earth pressure gauges 20 is provided.

  The rod-shaped member 19 is mainly composed of a substantially cylindrical tubular body 21 and a truncated conical distal end portion 22 provided at the distal end of the tubular body 21. In the present embodiment, the rod-shaped member 19 is rotatably supported by the bulkhead 5 via a substantially cylindrical support cylinder 23 attached to the bulkhead 5. A seal member 24 that seals between the cylinder 21 of the rod-shaped member 19 and the support cylinder 23 is disposed on the inner periphery of the support cylinder 23.

  The actuator according to the present embodiment includes a jack 25 (hydraulic jack in the present embodiment) 25 housed in a cylindrical body 21 of the rod-shaped member 19, and one end of the jack 25 (rod 27 in the illustrated example) is the rod-shaped member 19. The other end of the jack 25 (in the illustrated example, the cylinder tube 26) is attached to the bulkhead 5 or the shield body 2 and attached to an attachment portion 21a provided in the cylindrical body 21.

  In the present embodiment, the rod 27 rotates in the circumferential direction with respect to the cylinder tube 26 of the jack 25, whereby the rod-shaped member 19 attached to the rod 27 of the jack 25 rotates in the circumferential direction. A rotation restraining mechanism 28 for restraining the rotation is provided. For example, a plurality of the rotation restraining mechanisms 28 are provided on the inner periphery of the cylindrical body 21 of the rod-shaped member 19 at intervals in the circumferential direction, the rail 29 extending in parallel with the longitudinal direction of the rod-shaped member 19, and the jack 25 A guide 30 is provided on the cylinder tube 26 and engages with the rail 29 sandwiched from both sides thereof. A tip portion 31 of the rail 29 is formed in a taper shape with a width narrowing toward the tip, and the rail 29 provided on the inner periphery of the cylindrical body 21 of the rod-like member 19 is connected to a guide 30 provided on the cylinder tube 26 of the jack 25. On the other hand, it is easy to engage from the rear in the excavation direction.

  When restraining the rotation of the rod-shaped member 19, the jack 25 is extended so that the rod-shaped member 19 is moved forward in the digging direction to a position where the rail 29 of the rod-shaped member 19 engages the guide 30 of the jack 25. (See FIG. 4). By engaging the rail 29 of the rod-shaped member 19 with the guide 30 of the jack 25, the rotation of the rod-shaped member 19 is restrained and each orthogonal earth pressure gauge 20 is positioned in a predetermined direction.

  On the other hand, when the rod-shaped member 19 is rotated to change the direction of each orthogonal earth pressure gauge 20, the jack 25 is retracted and the rod-shaped member 19 is moved to a position where the rail 29 of the rod-shaped member 19 is detached from the guide 30 of the jack 25. Is moved rearward in the digging direction (see FIG. 3). With the rail 29 of the rod-shaped member 19 detached from the guide 30 of the jack 25 and the positioning pin 33 removed from the positioning hole 21b provided at the rear end portion of the cylindrical body 21 of the rod-shaped member 19, the jig 32 (FIG. 7). If the direction of each orthogonal earth pressure gauge 20 is changed by rotating the rod-shaped member 19 by a predetermined angle in the circumferential direction using the reference pin), the positioning pin 33 is inserted into the positioning hole 21b of the rod-shaped member 19. (See FIG. 3).

  In the present embodiment, the orthogonal earth pressure gauge 20 is attached to the cylindrical body 21 of the rod-shaped member 19 so that the detection unit for detecting pressure is exposed from the outer peripheral surface of the rod-shaped member 19 (cylindrical body 21).

  The sediment flow calculation means of this embodiment includes a calculator 35 (see FIG. 4) connected to the measuring instrument 34 (see FIG. 4) of the orthogonal earth pressure gauge 20.

  In addition, the shield machine 1 is injected into the chamber 6 from the additive inlet 12 according to the direction and size of the sediment in the chamber 6 determined by the computing unit 35 (sediment flow computing means). An additive injection amount determining means for determining the injection amount of the material is provided. The additive injection amount determining means of the present embodiment includes the calculator 35.

  Moreover, in this embodiment, the chamber internal sediment property measuring apparatus 18 (bar-shaped member 19) of the same structure is provided in the lower part of the bulkhead 5 (left and right of the screw conveyor 7), the inner peripheral part of the bulkhead 5, and the upper part of the bulkhead 5. In total, seven are arranged (see FIG. 2).

  When measuring the sediment flow in the chamber 6, the jack 25 is extended, and the rod-shaped member 19 (orthogonal earth pressure gauge 20) is moved to a predetermined position in the chamber 6 forward in the excavation direction.

  The computing unit 35 obtains the flow direction and size of the earth and sand in the chamber 6 based on the measurement values of the orthogonal earth pressure gauges 20 located in the chamber 6, and obtains the obtained flow direction of the earth and sand in the chamber 6 and According to the size, the injection position of the additive and the injection amount of the additive are determined.

  In the present embodiment, the calculator 35 determines the flow direction and size of the earth and sand based on the difference between the measured values of the orthogonal earth pressure gauges 20 arranged at intervals in the circumferential direction of the rod-shaped member 19. It has become.

  For example, the computing unit 35 includes the measured value of the orthogonal soil pressure gauge 20 that has obtained the maximum value among the orthogonal soil pressure gauges 20 arranged at intervals in the circumferential direction of the rod-shaped member 19 and the other orthogonal soil pressure gauges 20. Based on the difference from the measured value, the direction and size of the sediment flow are determined. Alternatively, the computing unit 35 may measure the measured value of the orthogonal soil pressure gauge 20 that has obtained the minimum value of the orthogonal soil pressure gauges 20 arranged at intervals in the circumferential direction of the rod-shaped member 19 and the other orthogonal soil pressure gauges 20. Based on the difference from the measured value, the direction and size of the sediment flow are determined.

  Further, in the present embodiment, the computing unit 35 is used when the magnitude of the sediment flow exceeds a predetermined value, or when the sediment is sufficiently fluidized and the sediment is flowing (the circumference of the rod-shaped member 19). When the measured values of the orthogonal earth pressure gauges 20 arranged at intervals in the direction are different from each other by a predetermined value), it is determined that the sediment in the chamber 6 is sufficiently fluidized and injected into the chamber 6 The amount of the additive to be injected is reduced.

  On the other hand, when the magnitude of the sediment flow is equal to or less than a predetermined value, or when the sediment 35 is not sufficiently fluidized and the sediment 35 is not recognized to flow (the interval in the circumferential direction of the rod-shaped member 19). When there is no difference between the measured values of the orthogonal earth pressure gauges 20 arranged apart from each other in a predetermined value), it is determined that the sediment in the chamber 6 is not sufficiently fluidized (closed), and the chamber 6 The amount of additive to be injected into the inside is increased.

  Further, the computing unit 35 is different from the sediment flow (sediment flow direction) in which the sediment flow (sediment flow direction) within the chamber 6 determined by the plurality of chamber sediment property measuring devices 18 is considered appropriate. In this case, the amount of the additive to be injected into the chamber 6 is increased, and then the sediment flow (the sediment flow direction) in the chamber 6 determined by the plurality of chamber sediment property measuring devices 18 seems to be appropriate. When similar to the sediment flow (the direction of sediment flow), the amount of additive injected into the chamber 6 is reduced.

  Further, the chamber earth and sand property measuring device 18 of the present embodiment is disposed at the tip of the rod-shaped member 19 (tip of the tip portion 22), and an axial earth pressure gauge 36 for measuring the axial pressure of the rod-shaped member 19; Sediment property calculation means for determining the property (hardness) of the soil in the chamber 6 based on the moving speed of the rod-shaped member 19 when the rod-shaped member 19 is inserted into the soil in the chamber 6 and the measured value of the axial earth pressure gauge 36. With.

  In the present embodiment, the axial earth pressure gauge 36 is attached to the distal end portion 22 of the rod-shaped member 19 so that the detection portion for detecting pressure is exposed from the distal end surface of the rod-shaped member 19 (the distal end portion 22).

  The earth and sand property calculating means of the present embodiment includes a calculator 38 (see FIGS. 9 and 10) connected to a measuring device 37 (see FIGS. 9 and 10) of the orthogonal earth pressure gauge 36.

  Further, the shield machine 1 has an injection amount of the additive material injected into the chamber 6 from the additive material inlet 12 according to the property of the soil and sand in the chamber 6 obtained by the calculator 38 (sediment property calculation means). An additive injection amount determining means for determining is provided. The additive injection amount determining means of the present embodiment is composed of the calculator 38.

  FIG. 9 and FIG. 10 each show an example of a system configuration for measuring the sediment property in the chamber 6.

  In the system configuration shown in FIG. 9, the power unit 40 of the jack 25 is controlled so that the amount of oil supplied to the head side oil chamber 39 of the jack 25 becomes a constant amount of oil, and the rod-shaped member 19 is moved at a constant moving speed in the chamber 6. It penetrates the earth and sand inside.

  In the system configuration shown in FIG. 9, the computing unit 38 measures the measured value of the axial earth pressure gauge 36 at each penetration distance when the rod-like member 19 penetrates the earth and sand in the chamber 6 at a constant moving speed. The property (hardness) of the earth and sand in the chamber 6 is determined from the change pattern of the measured value of the axial earth pressure gauge 36 with respect to the penetration distance. The penetration distance and moving speed of the rod-shaped member 19 are obtained based on the detection value of the stroke sensor 41 of the rod-shaped member 19.

  In the system configuration shown in FIG. 9, the computing unit 38 determines the property (hardness) of the soil in the chamber 6 when the measured value of the axial earth pressure gauge 36 at each penetration distance is below a predetermined value. Is determined to be softer than the appropriate property (hardness), and the amount of additive to be injected into the chamber 6 is reduced, while the measured value of the axial earth pressure gauge 36 at each penetration distance exceeds a predetermined value. In this case, it is determined that the property (hardness) of the earth and sand in the chamber 6 is harder than the appropriate property (hardness), and the amount of the additive to be injected into the chamber 6 is increased.

  Further, in the system configuration shown in FIG. 10, a control valve 43 is provided in a hydraulic pressure supply line 42 that connects the head side hydraulic chamber 39 of the jack 25 and the power unit 40, and allows the rod-shaped member 19 to penetrate into the earth and sand in the chamber 6. At this time, the amount of oil supplied to the head side oil chamber 39 of the jack 25 is adjusted by the control valve 43 so that the measured value of the axial earth pressure gauge 36 becomes constant, and the rod-shaped member 19 is kept in the chamber 6 at a constant pressure. To penetrate the earth and sand.

  In the system configuration shown in FIG. 10, the calculator 38 has the rod-shaped member 19 corresponding to the penetration speed and the moving speed of the rod-shaped member 19 at each penetration distance when the rod-shaped member 19 is penetrated into the earth and sand in the chamber 6 with a constant pressure. The property (hardness) of the earth and sand in the chamber 6 is determined from the change pattern of the moving speed. The penetration distance and moving speed of the rod-shaped member 19 are obtained based on the detection value of the stroke sensor 41 of the rod-shaped member 19.

  In the system configuration shown in FIG. 10, the computing unit 38 determines the property (hardness) of the earth and sand in the chamber 6 when the moving speed of the rod-shaped member 19 at each penetration distance exceeds a predetermined value. Is determined to be softer than the appropriate property (hardness), and the amount of additive to be injected into the chamber 6 is reduced, while the moving speed of the rod-shaped member 19 at each penetration distance is not more than a predetermined value. The property (hardness) of the earth and sand in the chamber 6 is determined to be harder than the appropriate property (hardness), and the amount of the additive to be injected into the chamber 6 is increased.

  In the present embodiment, since the axial earth pressure gauge 36 is disposed at the tip of the rod-shaped member 19 that is supported by the bulkhead 5 so as to be able to move in and out of the chamber 6, the rod-shaped member 19 is inserted into the earth and sand in the chamber 6. The penetration resistance at the time can be detected, and the property (hardness) of the earth and sand in the chamber 6 can be known. The penetration resistance corresponds to the pressure (measured value of the axial earth pressure gauge 36) received by the rod-like member 19 (axial earth pressure gauge 36) when the rod-like member 19 penetrates the earth and sand in the chamber 6 at a constant speed. Alternatively, since the rod-shaped member 19 corresponds to the moving speed of the rod-shaped member 19 when the rod-shaped member 19 is penetrated into the earth and sand in the chamber 6 at a constant pressure, the rod-shaped member 19 is moved at a constant speed in the system configuration shown in FIG. 10 can be obtained from the measured values of the axial earth pressure gauge 36 at each penetration distance when penetrating into the earth and sand. In the system configuration shown in FIG. 10, the rod-like member 19 is kept in the chamber 6 at a constant pressure. It can be determined from the moving speed of the rod-shaped member 19 at each penetration distance when penetrating the earth and sand.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various other embodiments can be adopted.

  For example, in the above-described embodiment, the rod-shaped member 19 is rotatably supported by the bulkhead 5, but a plurality of orthogonal earth pressure gauges 20 are arranged on the side surface of the rod-shaped member 19 at intervals in the circumferential direction. In addition, since the flow direction of the earth and sand in the chamber 6 can be detected without rotating the rod-shaped member 19, the rod-shaped member 19 does not necessarily need to be rotatably supported by the bulkhead 5.

  In the above-described embodiment, a plurality of orthogonal earth pressure gauges 20 are provided on the side surface of the rod-shaped member 19 at intervals in the circumferential direction. However, only one orthogonal earth pressure gauge 20 may be provided on the side surface of the rod-shaped member 19. . In that case, the rod-shaped member 19 is rotated by a predetermined angle to change the direction in which the detection unit of the orthogonal earth pressure gauge 20 is directed, and each time the rod-shaped member 19 is penetrated into the earth and sand in the chamber 6 and the chamber 6 The earth pressure is measured by the orthogonal earth pressure gauge 20, and the flow direction and size of the earth and sand in the chamber 6 are obtained based on the measurement values of the orthogonal earth pressure gauge 20 at each angle.

  Further, the flow direction and size of the earth and sand in the chamber 6 obtained by the earth and sand flow calculating means (calculator 35), and the property (hardness) of the earth and sand in the chamber 6 obtained by the earth and sand property calculating means (calculator 38). Based on the above, the excavation speed of the shield machine 1, the rotational speed of the rotary cutter 3, the material of the additive, and the like may be determined.

FIG. 1 is a side sectional view of a shield machine according to an embodiment of the present invention. 2 is a view taken along the line II-II in FIG. FIG. 3 is a side cross-sectional view of the in-chamber sediment property measuring apparatus according to one embodiment of the present invention. FIG. 4 is a side cross-sectional view of the in-chamber sediment property measuring apparatus according to one embodiment of the present invention, showing a state in which a bar-like member is inserted into the chamber. FIG. 5 is a view taken along the line VV in FIG. 6 is a view taken along the line VI-VI in FIG. 7 is a view taken along the line VII-VII in FIG. 8 is a view taken along the line VIII-VIII in FIG. FIG. 9 is a schematic diagram showing an example of a system configuration for measuring the sediment property in the chamber. FIG. 10 is a schematic diagram showing an example of a system configuration for measuring the sediment property in the chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield machine 4 Cutter head 5 Bulk head 6 Chamber 18 Sediment property measuring device 19 in chamber 19 Bar-shaped member 36 Axial earth pressure gauge 38 Calculator (Sediment property calculation means, additive injection amount determination means)

Claims (4)

An apparatus for measuring sediment properties in a chamber formed between a cutter head and a bulk head of a shield machine,
A rod-like member supported in the bulkhead so as to be able to appear and retract in the chamber, an axial earth pressure gauge disposed at a tip of the rod-like member and measuring an axial pressure of the rod-like member, and the rod-like member And a sediment property calculating means for determining the sediment property in the chamber based on the moving speed of the rod-shaped member when penetrating the sediment in the chamber and the measured value of the axial earth pressure gauge. In-chamber sediment property measuring device.   2. The earth and sand property calculating means obtains the earth and sand property in the chamber based on a measured value of the axial earth pressure gauge when the rod-shaped member is penetrated into the earth and sand in the chamber at a constant moving speed. The soil sediment property measuring apparatus in a chamber described in 1.   The sand and sand property calculating means obtains the sand and sand property in the chamber based on a moving speed of the rod member when the rod member is penetrated into the sand and sand in the chamber at a constant pressure. In-chamber sediment property measuring device. A shield machine equipped with the in-chamber sediment property measuring device according to any one of claims 1 to 3,
According to the present invention, there is provided an additive injection amount determining means for determining an injection amount of the additive to be injected into the chamber according to the property of the sediment in the chamber obtained by the sediment property calculating means. And a shield machine.

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