JP2010077631A - Soil removing device for shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil removing device crushing large lumps included in excavated soil excavated by a shield machine, into small pieces to prevent a screw conveyor from being blocked with the large lumps, thereby smoothly carrying them out backward. <P>SOLUTION: The front end opening of the screw conveyor 6 faces a sediment storage chamber 4 between a cutter plate 2 and a bulkhead 3 in the shield machine, and the front end of a rotating center shaft 8 of the screw conveyor 6 and the front end of a screw blade 9 stuck to the rotating center shaft 8, are projected into the sediment storage chamber 4. Several support protrusions 14-16 are protrusively provided at each predetermined circumferential space on the facing surfaces of the front and rear blade parts 9a, 9b in these projecting parts and on the rotating center shaft 8. While supporting the large lumps A in the erected state by the adjacent support protrusions 14-16, the large lumps A are pressed to the front face of the bulkhead 3 by the rotation of the screw blade 9 and crushed into small pieces. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a shield excavator capable of discharging excavated soil while preventing clogging of the screw conveyor by a large mass such as a lump or gravel when discharging excavated soil excavated by a shield excavator by a screw conveyor. It is related with the earth removal apparatus in.

  Conventionally, as a method of excavating a tunnel while preventing the face from collapsing with a shield excavator, for example, while holding the face by injecting high-concentration mud water into the face through the machine, A mud pressurizing method is adopted in which excavated soil mixed with mud water in a sediment storage chamber formed between the partition walls rotatably supported is discharged backward through a screw conveyor.

  In this mud pressurizing method, when excavated soil in the sediment storage chamber is carried out by a screw conveyor, if there is a large mass such as earth lump or gravel in the excavated soil, it cannot be carried out by the screw conveyor. However, there is a possibility that the large mass will be caught between the cylindrical fixed casing of the screw conveyor and the rotating screw blades, and an excessive load will be applied to the screw conveyor, resulting in a situation where the operation becomes impossible. However, there is a problem in that it takes a lot of work to remove the mud, and there is a danger in performing the work.

  For this reason, for example, as described in Patent Document 1, a crushing bit is attached to a protruding end of a screw blade in a screw conveyor that faces a front end opening of a fixed casing from a lower end of a partition wall into a sediment storage chamber. The fixed crushing bit is projected from the inner peripheral surface of the skin plate below the protruding end of the screw conveyor so as to face the crushing bit, and a large lump is sandwiched between the crushing bits to crush. At the same time, a soil removal device has been developed in which a crushing bit is provided at the front end of the rotation center shaft in the fixed casing so as to secondary crush the crushed material taken into the fixed casing.

Japanese Patent Laid-Open No. 11-343792

  However, since the excavated soil taken into the sediment storage chamber of the shield excavator is constantly flowing due to the stirring action of the stirring plate protruding from the back of the cutter plate in a mixed state with mud water, Even if a large lump such as mixed lump or gravel stays in the lower part of the sediment storage chamber due to its own weight, it is difficult to hold in the locked state at the position by the fixed crushing bit, Even when it is in a state supported by the fixed crushing bit, when the crushing bit protruding from the protruding end of the screw blade presses against a large lump existing on the fixed crushing bit according to the rotation of the screw blade, There was a problem in that the large block was reluctant and detached from the fixed crushing bit, and it was difficult to perform reliable crushing.

  Further, a large lump in the sediment storage chamber is scraped into the fixed casing with the rotation of the tip of the screw blade protruding from the open end of the fixed casing, or a large lump from the upper side in the sediment storage chamber. When the lump is fitted between the tip blade portion of the screw blade and the opening end of the fixed casing, the large lump is moved toward the opening end of the fixed casing by the inclined surface of the rotating screw blade. When the pressing force is forcibly sent and the large mass bites into the opening end of the fixed casing due to the pressing force, the opening end of the fixed casing protrudes outward from the opening end. Even if a part of the large lump to be cut is cut, the remaining large lump fed into the fixed casing is filled in the fixed casing. If the crushing bit is made of viscous earth, even if a crushing bit protrudes from the front end of the rotation center shaft, secondary crushing by this crushing bit becomes difficult and the fixed casing closes, There was a possibility that operation might become impossible due to excessive load.

  The present invention has been made in view of such problems, and the object of the present invention is that when the excavated soil is taken into the screw conveyor, a large lump mixed in the excavated soil is present at the opening end of the screw conveyor. In a shielded excavator that can be smoothly transported without overloading the screw blades in a small state that can be easily transported in the fixed casing of the screw conveyor without biting in or closing the conveyor. To provide a soil removal device.

  In order to achieve the above object, a soil excavator in a shield excavator according to the present invention comprises a cutter plate disposed at an opening end of a skin plate and a cutter plate rotatably supported as described in claim 1. Shield excavation configured to pass through the lower end of the bulkhead to the earth storage chamber partitioned by the bulkhead, and to face the front end opening of the screw conveyor, and to discharge the excavated soil in the sediment storage chamber to the rear by this screw conveyor In the earth discharging device in the machine, the outer periphery of the front end of the rotation center shaft of the screw conveyor protruding forward from the front end opening of the fixed casing of the screw conveyor and the front end outer periphery of the rotation center shaft are fixed in a spiral manner. A plurality of blades supporting a large lump such as a large-diameter earth lump on the outer peripheral surface of the opposed blade portion adjacent to the front and rear of the front end of the screw blade It is set to protrude and become structurally at predetermined intervals Holders in the circumferential direction.

  In the earth removing device in the shield excavator configured as described above, the invention according to claim 2 is configured so that the supporting protrusions are opposed to the front and rear of the opposing surface outer peripheral portion of the blade portion adjacent to the front end of the screw blade. The front and rear support protrusions are used as a pair, and several pairs of support protrusions are arranged at regular intervals in the circumferential direction, and the length direction of the rotation center shaft portion between the front and rear adjacent blade portions is Support protrusions are provided on the outer peripheral surface of the intermediate part so as to be positioned in the intermediate part between the support protrusions adjacent in the circumferential direction.

  Furthermore, the invention according to claim 3 is arranged such that the screw conveyor is inclined obliquely upward from the front end facing the earth and sand storage chamber through the lower end of the isolation in the shield excavator toward the rear in the machine. In addition, the front end portion of the screw blade protruding from the front end opening of the fixed casing in the British screw conveyor is protruded into the sediment storage chamber through a through hole provided in the lower end portion of the partition wall.

  According to the invention which concerns on Claim 1, the front-end part outer peripheral surface of the rotation center axis | shaft of this screw conveyor which protrudes ahead toward the earth and sand storage chamber from the front-end opening part of the fixed casing in a screw conveyor, and the front end of this rotation center axis | shaft A plurality of support protrusions for supporting a large lump such as a large-diameter earth lump are provided on the outer peripheral surface of the blade portion adjacent to the front and rear of the front end of the screw blade spirally fixed to the outer peripheral surface of the portion. Projected at predetermined intervals in the direction, large masses such as dirt and gravel were taken in between the opposing surfaces of the blade parts adjacent to the front and rear of the front end of the screw blade protruding toward the sediment storage chamber. At this time, the large mass can be supported in a erected state between the supporting protrusions protruding from the opposing surfaces of the front and rear blades and locked to these supporting protrusions, and protruded from the rotation center shaft. Supporting protrusion It can be supported in a state of being lifted from the rotation center axis by.

  Therefore, despite the force of the excavated soil that is forcibly taken in by the rotation of the screw blades, the axis of the rotation center axis on which the large mass is on the rotation locus of the support protrusion by the locking force with the support protrusion To move integrally with the support protrusion in the direction opposite to the direction of taking in the excavated soil (direction of rotation of the screw blades) on the circumference orthogonal to the above, and reliably eliminate the risk of biting into the front end opening of the fixed casing Can do.

  In addition, the screw conveyor which is the earth removing device in the shield excavator is normally inclined obliquely upward from the front end side facing the lower end portion of the isolation toward the rear end as described in claim 3. Since the front end portion of the screw blade protruding from the front end opening of the fixed casing in the screw conveyor is protruded into the earth and sand storage chamber through the through hole provided in the lower end portion of the partition wall, The large lump supported in a locked state on the support protrusions protruding on the opposing surfaces of the front and rear adjacent blade portions on the upper peripheral surface of the front end portion of the rotation center shaft is integrated with the rotation center shaft. When moving downward by the rotation of the screw blade rotating in the forward direction, the distance between the support projection projecting rearwardly on the front blade portion and the through hole of the partition wall is gradually narrowed, and between the front and rear blade portions Projecting The projecting portion of the large block is wedged into the periphery of the through-hole, and the support protrusion and the front end of the rotation center shaft projecting from the peripheral edge of the through-hole and the front blade portion facing the peripheral edge It is clamped by the support protrusion protruding on the part, and the large mass can be reliably crushed into a small state by the clamping pressure.

  In this way, the lump that is reduced by crushing and removing the protruding part protruding from the blade part, when the support protrusion supporting the lump in the locked state is turned downward by the rotation of the screw blade, After the locking force with the support protrusion is released and the material falls into the sediment storage chamber, it is again taken in by the screw blade together with the lump. At this time, the lump is further reduced in diameter by stirring or the like in the sediment storage chamber and then taken in by the screw blades. However, even if the lump is taken in as it is without being reduced in diameter, the large lump is rotated by the support protrusion. Since it is subdivided in a state where it is lifted from the central axis, a gap is generated between the fixed casing and the rotating central shaft by the lifted amount, so that the fixed casing is not blocked, and Without excessive load being applied to the screw blades, the screw blades can be smoothly discharged by rotation.

  Furthermore, according to the invention which concerns on Claim 2, the support protrusion is protrudingly provided so that it may oppose front and back on the opposing surface outer peripheral part of the blade | wing part adjacent to the front-and-rear part in the front-end part of the said screw blade, A pair of support protrusions opposed to each other, and several pairs of support protrusions are arranged at regular intervals in the circumferential direction, and on the outer peripheral surface in the longitudinal direction of the rotation center shaft portion between the front and rear adjacent blade portions, Since the support protrusions are provided so as to be located in the middle part between the support protrusions adjacent to each other in the circumferential direction, these support protrusions are respectively located at the corners of the triangle, and the large chunks are made of these. It is supported at three points by the support protrusions, and the bottom of the large lump fits into the space surrounded by the support protrusions so that it can be reliably and stably captured and supported for the large lump. Protrusion locking force In spite of the scraping force of the screw blades, the clamping force by the peripheral edge of the through hole provided in the partition wall and the support protrusion as described above, without being sent to the opening end side of the fixed casing. The large chunk can be surely subdivided. It should be noted that the time from when the large mass is inserted and supported between the support protrusions to when it is subdivided is instantaneous, and does not interrupt the discharging operation of the excavated soil by the screw conveyor.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified vertical side view of a shield excavator equipped with a soil removal device, and FIG. 2 is a vertical side view of a main part of the soil removal device. In the shield excavator, a cutter plate 2 is rotatably disposed in a front end opening of the skin plate 1, and a partition 3 and the cutter plate 2 that support the cutter plate 2 rotatably. A space between the two is formed in a sediment storage chamber 4 for taking in excavated soil excavated by the cutter plate 2. Further, a screw conveyor 6 as a soil removal device for discharging the excavated soil in the sediment storage chamber 4 rearward is installed in the machine on the rear side of the partition wall 3.

  The screw conveyor 6 has a front end opening that faces the earth and sand storage chamber 4 through a circular hole 5 formed at the lower end of the partition wall 3 and is inclined obliquely upward from the front end toward the rear end. A cylindrical fixed casing 7, a rotation center shaft 8 disposed at the center of the fixed casing 7 over the entire length of the fixed casing 7, and an outer peripheral surface of the rotation center shaft 8. It consists of a fixed screw blade 9 and a drive motor 10 for the rotation center shaft 8 attached to the rear end of the fixed casing 7, and is further opened and closed by an opening / closing plate 11 at the lower periphery of the rear end of the fixed casing 7. An earth exit 12 is provided. Reference numeral 13 denotes a jack for opening / closing the opening / closing plate 11. Note that the screw blade 9 is provided with a reinforcing layer 9c having a constant thickness on the outer peripheral edge thereof and having wear resistance over the entire length.

  The outer diameter of the fixed casing 7 in the screw conveyor 6 is formed to be slightly smaller than the through hole 5 provided in the partition wall 3, and the partition wall with the front end opening facing the through hole 5 is formed. 3 is supported in a fixed state on the rear surface. Further, the front end portion of the rotation center shaft 8 and the front end portion of the screw blade 9 fixed to the outer peripheral surface of the front end portion are protruded from the front end opening portion of the fixed casing 7 into the sediment storage chamber 4 through the through hole 5. ing.

  The front and rear lengths of the front end portion of the screw blade 9 projecting forward from the front end opening of the fixed casing 7 are length portions including the two blade portions 9a and 9b from the tip of the screw blade 9. The entire blade portion 9a at the front end and at least a part of the next blade portion 9b following the blade portion 9a are projected from the through hole 5 of the partition wall 3 into the sediment storage chamber 4. Further, the outer peripheral portions of the facing surfaces of the blade portions 9a and 9b adjacent to the front and rear, that is, the rear outer peripheral portion of the frontmost blade portion 9a facing rearward, and the subsequent blade portion 9b connected to the blade portion 9a. A plurality of (three in the figure) supporting protrusions 14 and 15 are provided at predetermined intervals in the circumferential direction to support a large lump A such as a large-diameter earth lump in a erected state. In addition, a plurality of support protrusions 16 are provided at predetermined intervals in the circumferential direction on the outer peripheral surface of the front end portion of the rotation center shaft 8 existing between the front and rear blade portions 9a and 9b. is doing.

  The support protrusions 14 and 15 projecting on the opposing surfaces of the blade parts 9a and 9b adjacent to each other in the front-rear direction are arranged on the rear blade part 9b with respect to the support protrusion 14 projecting on the front blade part 9a. The projecting support projections 15 are arranged so as to oppose front and rear on a line perpendicular to the inclined surface of the blade portion, and several pairs (see FIG. Are arranged at predetermined angular intervals (120 degrees in the figure), and the support protrusions 16 protruding from the outer peripheral surface of the front end portion of the rotation center shaft 8 are screw conveyors. In a state where 6 is viewed from the front, it is provided so as to be positioned at an intermediate portion between the support protrusions 14 and 14 adjacent to each other in the circumferential direction (between 15 and 15). The pair of front and rear support protrusions 14 and 15 may be provided so as to face each other on a line parallel to the axis of the rotation center shaft 8.

  The shape of the support protrusions 14 to 16 is not particularly limited. However, in the drawing, the height of the support protrusions 14 to 16 is a short column shape having a height of about 1/8 of the pitch interval of the screw blades 9, and has a metal coating layer having wear resistance. In addition, the peripheral edge of the circular protruding end face is formed at the ridge corner that receives the large mass A in the locked state.

  Further, on the front surface side of the blade portion 9a on the foremost end side, these support protrusions 15 and 15 in a spiral direction with respect to the support protrusion 15 protruding from the front outer peripheral portion of the blade portion 9b connected to the rear of the blade portion 9a. And the same shape on the outer peripheral surface of the projecting end of the rotation center shaft 8 projecting forward from the blade portion 9a on the foremost end side. A stirring protrusion 18 having a protrusion is provided.

  With this configuration, in order to excavate the face ground with a shield excavator, high-concentration mud water is supplied from the rear side of the machine through a mud supply pipe (not shown) and injected into the face side. While preventing the collapse, excavation is performed by rotationally driving the cutter plate 2, and the tunnel is dug by propelling the shield excavator according to the excavation amount. The excavated soil excavated by the cutter plate 2 is taken into the earth and sand storage chamber 4, and several rods or plates protruding from the rear surface of the cutter plate 2 and the front surface of the partition wall 3 in the earth and sand storage chamber 4. The agitating member 19 is agitated and mixed with the muddy water according to the rotation of the cutter plate 2 and is conveyed backward by the screw conveyor 6 facing the earth and sand storage chamber 4 from the lower end of the partition wall 3 while being plastically fluidized.

  The intake of the excavated soil by the screw conveyor 6 is performed while maintaining the inside of the sediment storage chamber 4 at a constant pressure, and in this state, the soil discharge port 12 provided at the rear end portion of the screw conveyor 6 is opened to open the muddy water. The mud soil is mixed with excavated soil.

  The excavated soil excavated by the cutter plate 2 includes a large lump A such as a hard lump or gravel. The large lump A is not crushed and divided by the stirring member 19 and is screw conveyor. 6 is reached by the protruding end of the screw blade 9 of the screw conveyor 6 which reaches the opening end side of the partition wall 3 and protrudes from the through hole 5 of the partition wall 3 into the earth and sand storage chamber 4 or is stored from above. When fitted between the front and rear blade portions 9a and 9b protruding into the chamber 4, as shown in FIGS. 2 and 3, the large mass A has a pair of front and rear support protrusions 14, 15 and these support protrusions 14, 15 is supported in a trapped state by a support protrusion 16 protruding from the outer peripheral surface of the front end portion of the rotation center shaft 8 adjacent to 15.

  That is, a pair of front and rear support protrusions 14 and 15 projecting from the opposing surfaces of the front and rear blade parts 9a and 9b, and the center of rotation between the blade parts 9a and 9b adjacent to the support protrusions 14 and 15 Since the supporting protrusions 16 protruding from the outer peripheral surface of the front end portion of the shaft 8 are arranged at the corners of the triangle, a large mass A is formed between the front and rear blade portions 9a and 9b. Is captured by the support protrusions 14 to 16 at three points, and the bottom of the large mass A is fitted in the space surrounded by the support protrusions 14 to 16 so that the center of rotation is obtained. The bottom of the shaft 8 is lifted from the outer peripheral surface of the front end portion, and can be locked to the support protrusions 14 and 16 to be supported in a stable capturing state.

  In this way, the large block A fits into the space surrounded by the support protrusions 14 to 16 and the bottom of the large block A is supported in the locked state by the support protrusions 14 to 16, while the screw blades 9. In the direction of rotation. At this time, the rotation direction of the screw blades 9 is opposite to the direction in which the excavated soil is taken in by the rear spiral inclined surface of the screw blades 9, but the large mass A is engaged with the support protrusions 14 to 16 as described above. Since it is supported in a stopped state, it does not receive the force of acting backward by the inclined surface of the screw blade 9, and therefore may bite into the front end opening of the fixed casing 7 through the through hole 5 provided in the partition wall 3. However, the support protrusions 14 to 16 integrally operate on a virtual circumference having a radius orthogonal to the axis of the rotation center shaft 8.

  At this time, the rotation center shaft 8 is inclined obliquely upward from the front end toward the rear, and the front end portion projects from the through hole 5 provided in the partition wall 3 into the sediment storage chamber 4, while the partition wall 3. Since the front surface of this is formed into a vertical surface, a wedge-shaped space is provided between the front surface of the partition wall 3 and the rear surface of the front blade portion 9a, and protrudes from the rear surface of the front blade portion 9a. As the supporting protrusion 14 is moved downward from the upper side, it approaches the front surface of the partition wall 3.

  Therefore, when the large lump A supported on the supporting protrusions 14 to 16 with its bottom portion locked is shifted from the upper side to the lower side according to the rotation of the rotation center shaft 8, it protrudes from the front and rear blade portions 9a and 9b. The rear portion of the projecting portion of the large block A is pressed into the edge formed in the edge shape in the through hole 5 provided in the partition wall 3 so as to bite in a wedge shape, and the support protrusion 14 is projected. As the wedge-shaped space portion between the front blade portion 9a and the front surface of the partition wall 3 at the peripheral edge of the through hole 5 is gradually narrowed, a large mass A is formed by the front blade portion 9a and the edge portion of the through hole 5. Can be crushed by the shearing action of the rim of the through hole 5 and can be divided into small-diameter lumps.

  At the time of this crushing, the large mass A tries to escape in the direction opposite to the rotation direction of the rotation center shaft 8 due to the reaction force of the pressing force against the mouth of the through hole 5 acting on the large mass A. Support protrusions 14 and 15 projecting from the bottom of the large mass A on the front and rear blades 9a and 9b, and support protrusions projecting on the front end of the rotation center shaft 8 between these support protrusions 14 and 15 Since it is firmly supported in a state where it is locked to 16, it can be crushed into pieces while forcibly pressing against the edge of the edge of the through hole 5 without escaping.

  Thus, the protruding portion of the large block A from between the front and rear blade portions 9a, 9b that have been divided falls from the front end of the screw blade 9 into the earth and sand storage chamber 4, and becomes smaller by crushing and removing the protruding portion. When the lump between the front and rear blade portions 9a and 9b moves downward as the screw blade 9 rotates, the locking force with the support protrusions 14 to 16 is released and falls into the sediment storage chamber 4 and then again. Then, it is taken together with the lump by the screw blade 9.

  At this time, the lump is further reduced in diameter in the sediment storage chamber 4 by the stirring action of the stirring member 19 and then taken into the fixed casing 7 together with the excavated soil by the excavating soil raking force of the screw blades 9. Even if the screw blade 9 is directly taken into the screw blade 9, if the excavated soil scraping force of the screw blade 9 overcomes the locking force against the support protrusions 14 to 16, it is taken into the fixed casing 7 together with the excavated soil and supported. When the locking force with the projections 14 to 16 is larger than the scraping force, it is returned again into the earth and sand storage chamber 4 and becomes a small diameter by stirring or the like. Then, as shown in FIG. It is captured.

  Further, since the large lump is subdivided while being lifted from the rotation center shaft 8 by the support protrusions 14 to 16, the lump, the fixed casing 7 and the rotation center shaft 8 are separated by the lifted amount. As a result, a gap is formed in the fixed casing 7, and therefore, the screw casing 9 is smoothly transported rearward by the rotation of the screw blade 9 without closing the fixed casing 7 and applying an excessive load to the screw blade 9. By opening the opening / closing plate 11, it can be discharged from the soil discharge port 12 to a sediment transport cart (not shown) waiting downward.

  In addition, the bottom part of the large lump A taken in by the front-end part of the screw blade | wing 9 which protrudes in the earth and sand storage chamber 4 does not necessarily protrude from the front-end part of the rotation center axis | shaft 8 toward the outer-diameter direction. Without being supported on the protrusion 16, it is supported in a erected state between the support protrusions 14 and 15 projecting on the opposing surfaces of the blade parts 9a and 9b adjacent to each other in the front and rear, and the support protrusions 14 and 15 have a large lump. The bottom of the object A may be locked, and it may be forcibly operated along with the support protrusions in the rotation direction of the rotation center shaft 8, or the support protrusions 14 protruding from the opposing surfaces of the blade portions 9a and 9b. , 15 and the support protrusion 16 protruding from the front end portion of the rotation center shaft 8 may be configured to support the large mass A in a erected state.

The simplified vertical side view of a shield excavator. The expanded vertical side view of the front-end part of a soil removal apparatus. The longitudinal front view in the XX line. The simplified perspective view of the front-end part of a soil removal apparatus. The front view. The vertical side view of the state which is carrying out the crushed lump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Skin plate 2 Cutter plate 3 Bulkhead 4 Sediment storage chamber 5 Through-hole 6 Screw conveyor 8 Rotation center axis 9 Screw blade
9a, 9b Blade
14-16 Support protrusion

Claims (3)

  The front end opening of the screw conveyor is exposed to the earth and sand storage chamber partitioned by the cutter plate arranged at the opening end of the skin plate and the partition wall that rotatably supports the cutter plate. In the earth discharging device in the shield excavator configured to discharge the excavated soil in the sediment storage chamber backward by the screw conveyor, the rotation center of the screw conveyor protruding forward from the front end opening of the fixed casing in the screw conveyor A large-diameter clot or the like on the outer peripheral surface of the front end portion of the shaft and the outer peripheral surface of the blade portion adjacent to the front and rear of the front end portion of the screw blade spirally fixed to the outer peripheral surface of the front end portion of the rotation center shaft A soil discharging apparatus for a shield excavator, wherein a plurality of supporting protrusions for supporting a large lump of the material are provided at predetermined intervals in the circumferential direction.   Support protrusions are provided on the outer peripheral surface of the blade surface adjacent to the front and rear sides of the front end of the screw blade so as to face the front and rear, and several pairs of support protrusions are fixed in the circumferential direction. It is arranged at every interval, and is located on the intermediate part outer peripheral surface in the length direction of the rotation center shaft part between the blade parts adjacent to the front and rear, so as to be positioned at the intermediate part between the support protrusions adjacent in the circumferential direction. The earthing device for a shield excavator according to claim 1, wherein a support protrusion is provided.   The screw conveyor is disposed in a state inclined obliquely upward from the front end toward the rear end, and the front end of the screw blade protruding from the front end opening of the fixed casing is provided in the lower end of the partition wall The soil discharging apparatus in the shield excavator according to claim 1, wherein the soil discharging apparatus protrudes into the sediment storage chamber.

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