JP6242652B2 - Sediment pressure pump, shield machine, and shield method for construction work - Google Patents

Description

  The present invention relates to a sediment pump for construction work, a shield machine including the sediment pump, and a shield method using the shield machine.

  There is known an eccentric pump, which is a type of rotary volume pump, in which a rotation shaft of a rotor is eccentric with respect to a central axis of a casing, that is, a vane pump (rotary pump) (see, for example, Patent Documents 1 and 2). In the vane pumps described in Patent Documents 1 and 2, an arc-shaped vane (blade) is swingably supported by the rotor, and the tip of the vane comes into contact with the inner peripheral surface of the casing by the pressure of the fluid. The sealing property between the tip of the vane and the inner peripheral surface of the casing is ensured.

JP 2002-130169 A JP-A 61-79882

  By the way, in the shield construction, the excavated sediment is pumped from the shield machine to the rear shear truck through the pipe connected to the vane pump by the vane pump connected to the screw conveyor of the shield machine. Here, it is necessary to increase the discharge pressure of the vane pump as the distance from the vane pump to the shear carriage becomes longer. On the other hand, in shield construction on ground with high water pressure, the discharge pressure of the vane pump naturally increases due to the increase of the inflow pressure of the excavated sediment to the vane pump, so depending on the distance from the vane pump to the shear carriage, the discharge pressure of the vane pump May be excessive. Therefore, the discharge pressure of the vane pump must be set according to the pumping distance of the excavated earth and sand and the groundwater pressure of the ground to be excavated. For this purpose, the vane pump is selected or the rotation speed of the motor of the vane pump is adjusted. There was a need.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the earth and sand pump for construction which can adjust discharge pressure according to the inflow pressure and pumping distance to the pump chamber of earth and sand. Is.

In order to solve the above problems, a sediment pump for construction work according to the present invention is a pump for pumping earth and sand used in construction work, comprising a circular pump chamber, a suction port, and a discharge port. A casing having a rotating shaft eccentric to the discharge port side with respect to the central axis in the pump chamber, and an outer diameter of the pump chamber that is swingably attached to the rotor. And a plurality of blades configured such that the tip contacts the peripheral wall of the pump chamber when swinging to the opposite side of the rotation direction of the rotor, and the discharge port moves in the rotation direction of the rotor The casing is provided in the casing, and the casing is provided with an inner casing provided with the suction port and having the pump chamber, and the discharge port is provided on the outer peripheral side of the inner casing. An outer casing provided rotatably around the central axis of the chamber, and the inner casing is provided with a long hole facing the movable range of the discharge port in the rotation direction of the rotor, A seal member that seals between the inner casing and the outer casing is provided around the hole, and the relative position of the discharge port with respect to the suction port in the rotation direction of the rotor is adjustable.

The plurality of discharge ports are provided so as to be aligned in the rotation direction of the rotor. Each of the plurality of discharge ports has an opening / closing mechanism, and the opening / closing position of the discharge port is adjusted by the opening / closing mechanism. Accordingly, the relative position of the discharge port with respect to the suction port in the rotation direction of the rotor may be configured to be adjustable .

Further, the discharge port is provided so as to extend in a rotation direction of the rotor, and the discharge port has an opening / closing mechanism capable of adjusting an opening / closing position in the extending direction, and the discharge port is provided by the opening / closing mechanism. By adjusting the opening / closing position, the relative position of the discharge port with respect to the suction port in the rotation direction of the rotor may be adjustable .

  Moreover, the shield machine which concerns on this invention is provided with the said earth and sand pumping pump for the said construction works, and pumps excavated earth and sand to the wellhead side with this earth and sand pumping pump.

  Moreover, the shield construction method according to the present invention excavates a tunnel using the shield machine.

  ADVANTAGE OF THE INVENTION According to this invention, the earth and sand pumping pump for construction works which can adjust discharge pressure according to the inflow pressure and pumping distance to the pump chamber of earth and sand can be provided.

It is a longitudinal cross-sectional view which shows a shield machine provided with the rotary pump for earth and sand pressure feeding which concerns on one Embodiment. It is 2-2 arrow line view of FIG. It is a perspective view which shows the rotary pump which concerns on one Embodiment. It is a perspective sectional view showing the rotary pump concerning one embodiment. It is a perspective view which shows the internal structure of the rotary pump which concerns on one Embodiment. It is a perspective view which shows the internal structure of the rotary pump which concerns on one Embodiment. It is a front view which shows the rotary pump which concerns on one Embodiment. It is a longitudinal cross-sectional view which shows the effect | action of the rotary pump which concerns on one Embodiment. (A)-(C) are perspective views for demonstrating adjustment of the position of the circumferential direction of a discharge part. (A)-(C) are sectional drawings for demonstrating adjustment of the position of the circumferential direction of a discharge part.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an earth pressure type shield machine 100 including a rotary pump 10 for earth and sand pressure feeding according to an embodiment. Moreover, FIG. 2 is a 2-2 arrow line view of FIG. As shown in these drawings, the shield machine 100 has a cylindrical front body portion 120 having a cutter head 110 at the head portion in the digging direction and a rear portion of the front body portion 120 via a bent jack (not shown). And a cylindrical rear trunk portion 130 connected thereto.

  The front body 120 is provided with a partition wall 124 disposed behind the cutter head 110, and a chamber 122 is provided between the partition wall 124 and the cutter head 110. The cutter head 110 includes cutter spokes 112 arranged in a cross shape and a number of cutter bits 114 provided on the front surface of the cutter spokes 112. Further, a stirring bar 116 is provided on each of the rear surface of the cutter spoke 112 and the front surface of the partition wall 124. Further, the cutter spoke 112 is provided with an additive supply port 118 for supplying an additive near the face. The additive supply port 118 is connected to an additive unit (not shown).

  In the front trunk portion 120 configured as described above, when the cutter head 110 rotates, the face is excavated by the cutter bit 114 and excavated earth and sand are taken into the chamber 122. Then, the excavated earth and sand taken into the chamber 122 is stirred and mixed by the stirring rod 116.

  A screw conveyor 134 extends from the front body 120 to the rear body 130. The front end of the screw conveyor 134 is attached to the opening of the partition wall 124, and the tip of the screw 135 of the screw conveyor 134 is inserted into the chamber 122. The screw conveyor 134 rotates the screw 135 and conveys earth and sand from the chamber 122 to the rear trunk portion 130.

  A pipe 138 is connected to a discharge port at the rear end of the screw conveyor 134 via a crusher 136 and a rotary pump 10, and earth and sand conveyed by the screw conveyor 134 are crushed by the crusher 136, It is pumped through a pipe 138 to a rear bogie (not shown) in the shield machine.

  3 is a perspective view showing the rotary pump 10, FIG. 4 is a perspective sectional view showing the rotary pump 10, and FIGS. 5 and 6 are perspective views showing an internal structure of the rotary pump 10. FIG. 7 is a front view showing the rotary pump 10. As shown in these drawings, the rotary pump 10 includes a casing 20 having a circular pump chamber 21, a rotor 30 disposed in the pump chamber 21, and a plurality of (this embodiment) attached to the rotor 30 in a swingable manner. The embodiment includes three blades (vanes) 40, a drive mechanism 50 that rotates the rotor 30, and a discharge position adjustment mechanism 60 that adjusts the circumferential position of the discharge portion 23A.

  The casing 20 includes double cylindrical inner casings 22 and outer casings 23, and lids 24 and 26 that seal both axial sides of the inner casing 22 and the outer casing 23. An upper portion of the inner casing 22 is provided with a suction portion 22A connected to the crusher 136 so as to protrude upward, and a discharge portion 23A connected to the pipe 138 is provided laterally (tangentially) on the side portion of the outer casing 23. Direction). The suction portion 22A and the discharge portion 23A are rectangular ducts when viewed in the suction or discharge direction. One wall surface 22F (see FIGS. 6 and 7) of the peripheral wall of the suction portion 22A is disposed horizontally along the tangent line of the inner casing 22. Further, one wall surface 23 </ b> C (see FIGS. 6 and 7) of the peripheral wall of the discharge portion 23 </ b> A is disposed horizontally or obliquely along the tangent line of the outer casing 23.

  Here, the outer casing 23 is formed with a rectangular long hole 23B (see FIG. 3) whose longitudinal direction is the circumferential direction, and the suction portion 22A protrudes upward through the long hole 23B. Further, the outer casing 23 is fitted to the inner casing 22 so as to be rotatable around the axis, and the suction portion 22A is movable in the circumferential direction relative to the elongated hole 23B. Further, the inner casing 22 is formed with a rectangular long hole 22B (see FIG. 3) whose longitudinal direction is the circumferential direction, and a discharge portion 23A is arranged facing the long hole 22B. A rectangular sealing material 22C (see FIG. 3) is attached to the peripheral portion of the long hole 22B so as to surround the long hole 22B, and the inner casing in the peripheral portion of the long hole 22B is attached by the sealing material 22C. The sealing property between 22 and the outer casing 23 is ensured.

  Further, annular flanges 22D and 22E are provided at both axial ends of the inner casing 22, and the outer casing 23 is sandwiched between the flanges 22D and 22E in the axial direction. Lids 24 and 26 are attached to the flanges 22D and 22E, respectively. The lids 24 and 26 are configured by combining a plurality of members, and are provided with a bearing 27, oil seals 28 and 29, etc. (see FIG. 4), respectively.

  The rotor 30 includes a shaft portion 31, a cylindrical body portion 32 that is coaxially arranged and integrated with the shaft portion 31, and disk-shaped flanges 33 that are coupled to both ends of the body portion 32 in the axial direction. (See FIG. 4). The shaft portion 31 is arranged parallel to and eccentric from the center axis of the casing 20 (see FIG. 7), and is rotatably supported by the lids 24 and 26 by a bearing 27. Here, the shaft center of the shaft portion 31, that is, the rotation shaft of the rotor 30 is eccentrically arranged on the discharge portion 23 </ b> A side (that is, on the opposite side of the suction portion 22 </ b> A) from the central axis of the casing 20. Thereby, the volume of the pump chamber 21 is larger on the suction portion 22A side than on the discharge portion 23A side.

  The outer peripheral portion of the flange 33 protrudes from the trunk portion 32 toward the outer peripheral side, and the shaft 42 of the blade 40 is attached to the outer peripheral portion of the flange 33 in parallel with the rotational axis of the rotor 30. The flange 33 is disposed so as to contact the lids 24 and 26 of the casing 20, and the lids 24 and 26 are provided with an oil seal 28 facing the outer peripheral portion of the flange 33. The lids 24 and 26 are formed with holes through which the shaft portions 31 are inserted, and oil seals 29 (see FIG. 4) are provided on the hole walls. Thereby, the sealing property between the lid | covers 24 and 26, the axial part 31, and the trunk | drum 32 is ensured.

  The plurality of blades 40 are arranged at predetermined intervals (120 ° intervals in the present embodiment) around the rotation axis of the rotor 30, and each blade 40 extends from the outer periphery of the rotor 30 to the outer diameter side of the pump chamber 21. It extends. A shaft 42 attached to the outer peripheral portion of the rotor 30 is rotatably attached to the base end portion of each blade 40, and each blade 40 swings around an axis 42 parallel to the rotation axis of the rotor 30. It is supported on the outer periphery of the rotor 30 as possible. Each blade 40 is inclined in the rotation direction of the rotor 30 (counterclockwise direction in FIGS. 5 and 6) from the outer peripheral portion of the rotor 30 toward the outer diameter side of the pump chamber 21. Further, the distance from the swing axis to the tip of each blade 40 is set to be longer than the distance from the swing shaft to the inner peripheral surface of the inner casing 22, and each blade 40 is opposite to the rotation direction of the rotor 30. The tip is configured to abut against the inner peripheral surface of the inner casing 22 when swinging in a direction (clockwise direction in FIGS. 5 and 6, hereinafter referred to as a counter-rotating direction).

  Each blade 40 is curved so that the outer diameter side of the pump chamber 21 is in front of the rotation direction of the rotor 30 (that is, swells to the opposite side of the rotation direction of the rotor 30 toward the base end side). . Thereby, the angle of the front-end | tip of each blade | wing 40 and the inner peripheral surface of the inner casing 22 becomes small, and the contact state of the front-end | tip of each blade | wing 40 and the inner peripheral surface of the inner casing 22 becomes close to surface contact.

  Further, a cemented carbide tip is integrated at the tip of each blade 40, and the inner peripheral surface of the inner casing 22 with which the cemented carbide chip abuts is covered with a rubber or urethane liner. Wear at the tip is suppressed.

  The drive mechanism 50 includes a motor 52, a speed reducer 54 connected to the output shaft of the motor 52, and a coupling 56 that connects the output shaft of the speed reducer 54 and the shaft portion 31 of the rotor 30. In this drive mechanism 50, the power of the motor 52 is output with the rotational speed reduced by the speed reducer 54. Thereby, the shaft part 31 connected by the coupling 56 is rotated, and the rotor 30 is rotated.

  As shown in FIGS. 6 and 7, the discharge position adjusting mechanism 60 includes a hydraulic cylinder 62, a support portion 64 that supports the tip of the hydraulic cylinder 62 on the outer peripheral surface of the outer casing 23, and a hydraulic cylinder 62. And a support portion 66 that supports the proximal end side of the suction portion 22A in a swingable manner. The support portion 64 is a hinge provided in the vicinity of the wall surface 23 </ b> C of the discharge portion 23 </ b> A in the outer casing 23 so as to be rotatable around an axis parallel to the rotation axis of the rotor 30. Further, the support portion 66 is provided on a support base 67 protruding from the wall surface 22F of the suction portion 22A, and supports the axially central portion of the cylinder portion 62A so as to be rotatable around an axis parallel to the rotation axis of the rotor 30. Yes. The support base 67 is a block having an inverted trapezoidal shape when viewed from the front, and the support portion 66 is attached to an inclined surface 67 </ b> A of the support base 67.

  FIG. 8 is a longitudinal sectional view showing the operation of the rotary pump 10 according to this embodiment. As shown in this figure, in the rotary pump 10, the rotor 30 is rotated in the counterclockwise direction in the figure to feed the earth and sand in the pump chamber 21 to a pipe 138 connected to the discharge portion 23A. At this time, the volume of the pump chamber 21 is larger on the suction portion 22A side than the discharge portion 23A side, and the internal pressure of the pump chamber 21 is lower on the suction portion 22A side than the discharge portion 23A side. Compressive force is generated on the discharge portion 23A side of 21. As a result, earth and sand are taken into the pump chamber 21 from the suction part 22A, and the taken earth and sand are pressure-fed from the discharge part 23A to the pipe 138.

  Here, the plurality of blades 40 can swing on the outer peripheral portion of the rotor 30 around a swing shaft parallel to the rotation shaft of the rotor 30 and toward the outer diameter side of the pump chamber 21. Since the blades 40 are supported in an inclined state in the rotation direction, when the rotor 30 is rotated, the blades 40 are swung in the counter-rotation direction of the rotor 30 by the pressure and centrifugal force of the earth and sand, and the tips are inside the inner casing 22. Contact with the peripheral surface. That is, while the rotor 30 is rotating, the tips of the blades 40 are maintained in pressure contact with the inner peripheral surface of the inner casing 22 by the pressure and centrifugal force of earth and sand acting on the blades 40. Thereby, the water stop between the front-end | tip of each blade | wing 40 and the internal peripheral surface of the inner side casing 22 can be maintained in a high state, and the rotary pump 10 excellent in pressure | voltage resistance is obtained.

  As a result, the rotary pump 10 according to the present embodiment is used to carry out earth pressure type shield construction in a high water pressure ground such as a place where the depth and pore water pressure are locally high. Even when water pressure is applied, leakage of groundwater from between the tip of the blade 40 and the inner peripheral surface of the inner casing 22 can be prevented. Therefore, by using the rotary pump 10 according to the present embodiment, it becomes possible to carry out the earth pressure type shield construction method on the ground of high water pressure, and it is necessary to separate the muddy water from the earth and sand, etc. The shield construction method can be eliminated and the construction cost can be reduced.

  In particular, in the rotary pump 10 according to the present embodiment, each blade 40 is curved so as to bend toward the rotation direction of the rotor 30 toward the outer diameter side of the pump chamber 21. And the inner peripheral surface of the inner casing 22 become smaller, and the contact state between the tip of each blade 40 and the inner peripheral surface of the inner casing 22 is close to surface contact. The water stoppage between the tip and the inner peripheral surface of the inner casing 22 can be improved, and the pressure resistance of the rotary pump 10 can be improved.

  9A to 9C are perspective views for explaining the adjustment of the circumferential position of the discharge portion 23A, and FIGS. 10A to 10C are cross-sectional views thereof. As shown in these drawings, when the hydraulic cylinder 62 is contracted most, the discharge portion 23A is inclined downward, and the angle (center angle) between the axis of the suction portion 22A and the axis of the discharge portion 23A is 90 ° or more. (For example, about 100 ° as shown in FIGS. 9A and 10A).

  9 (B), (C) and FIGS. 10 (B), (C), when the hydraulic cylinder 62 extends, the discharge portion 23A has an angle (center angle) with the suction port 22A. Is moved in the direction of narrowing (counterclockwise direction in the figure), and the angle between the axis of the suction part 22A and the axis of the discharge part 23A is less than 90 ° (for example, as shown in FIGS. 9B and 10B) About 80 °, and about 60 ° as shown in FIGS. 9C and 10C.

  Here, the volume of the pump chamber 21 decreases from the suction portion 22A side to the discharge portion 23A side as the hydraulic cylinder 62 extends and the discharge portion 23A moves in a direction in which the angle (center angle) with the suction portion 22A decreases. By increasing the rate, the discharge pressure of earth and sand from the discharge unit 23A increases. Therefore, as the distance from the rotary pump 10 to the shear carriage becomes longer, the hydraulic cylinder 62 is extended to move the discharge part 23A in a direction in which the angle with the suction part 22A becomes narrower. Thereby, the pumping capacity of the earth and sand by the rotary pump 10 can be adjusted so as to correspond to the distance from the rotary pump 10 to the shear truck. In addition, in the state shown in FIG. 9C and FIG. 10C, the interval between the blade 40 and the inner peripheral surface of the pump chamber 21 at the position of the discharge portion 23A is minimized, and the discharge portion is discharged from the suction portion 22A side. The rate of decrease of the volume of the pump chamber 21 toward the 23A side is the highest, and the discharge pressure of earth and sand from the discharge part 23A is the highest.

  On the other hand, as the hydraulic cylinder 62 contracts and the discharge portion 23A moves in the direction in which the angle (center angle) with the suction portion 22A increases, the rate of decrease in the volume of the pump chamber 21 from the suction portion 22A side to the discharge portion 23A side. The lower the is, the lower the discharge pressure of earth and sand from the discharge portion 23A. Therefore, when the groundwater pressure at the face position is high, the inflow pressure into the pump chamber 21 is high, but when the distance from the rotary pump 10 to the shear carriage is short, the hydraulic cylinder 62 is contracted to discharge the discharge unit. 23A is moved in a direction in which the angle with the suction portion 22A is increased. Thereby, it can adjust so that the discharge pressure of the rotary pump 10 may not become high too much.

  That is, in the rotary pump 10 according to the present embodiment, the relative position of the discharge portion 23A with respect to the suction portion 22A in the rotation direction of the rotor 30 is configured to be adjustable. The discharge pressure can be adjusted according to the pumping distance to the shear carriage.

  Moreover, in the rotary pump 10 according to the present embodiment, the casing 20 includes the inner casing 22 having the suction chamber 22 </ b> A and the pump chamber 21, and the discharge chamber 23 </ b> A and the inner periphery of the inner casing 22. And an outer casing 23 rotatably provided around the shaft. The outer casing 23 is provided with a long hole 23B that is long in the rotation direction of the rotor 30 and through which the suction portion 22A is inserted. Is provided with a long hole 22B that faces the movable range of the discharge portion 23A and is long in the rotation direction of the rotor 30, and further seals between the inner casing 22 and the outer casing 23 at the periphery of the long hole 22B. A sealing material 22C is provided. Thereby, the discharge part 23A can be moved in the rotation direction of the rotor 30 in a state in which the sealing property between the inner casing 22 and the outer casing 23 around the long hole 22B is secured.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, the position of the discharge port in the rotation direction of the rotor 30 can be adjusted by providing the discharge unit 23A in the casing 20 so as to be movable in the rotation direction of the rotor 30; A plurality of discharge portions may be provided so as to be aligned in the rotation direction of the rotor 30 and the positions of the discharge ports in the rotation direction of the rotor 30 may be adjusted by opening and closing each discharge portion 23A. Further, an opening / closing mechanism capable of adjusting the opening / closing position in the longitudinal direction is provided in the discharge section long in the rotation direction of the rotor 30 and the opening / closing position of the discharge section is adjusted, whereby the rotation direction of the rotor 30 of the discharge port is adjusted. May be adjusted.

  In the above-described embodiment, the present invention has been described by taking an earth pressure type shield machine equipped with a rotary pump as an example. However, the rotary pump according to the present invention is a pump used for pumping earth and sand in other construction works. It can also be applied to. In the above-described embodiment, the blades 40 extend from the rotor 30 to the outer diameter side of the pump chamber 21 while being inclined in the rotation direction of the rotor 30, and in the rotation direction of the rotor 30 as going to the outer diameter side of the pump chamber 21. Although it is configured to be bent so as to bend to the side, the blades 40 may be configured to extend straight from the rotor 30 without being inclined in the outer diameter direction.

10 rotary pump, 20 casing, 21 pump chamber, 22 inner casing, 22A suction part, 22B long hole, 22C sealing material, 22D, 22E flange, 22F wall surface, 23 outer casing, 23A discharge part, 23B long hole, 23C wall surface, 24, 26 Lid, 27 Bearing, 28, 29 Oil seal, 30 Rotor, 31 Shaft, 32 Body, 33 Flange, 40 Blades, 42 Shaft, 50 Drive mechanism, 52 Motor, 54 Reducer, 56 Coupling, 60 Discharge position adjustment mechanism, 62 hydraulic cylinder, 62A cylinder part, 64, 66 support part, 67 support base, 67A slope, 100 shield machine, 110 cutter head, 112 cutter spoke, 114 cutter bit, 116 stirring rod, 118 additive supply Mouth, 120 front torso , 122 chamber, 124 partition wall, the barrel after 130, 132 in broken jacks, 134 screw conveyor, 135 screw, 136 crushers, 138 pipe

Claims (5)

A pump that is used in construction work to pump earth and sand,
A casing having a circular pump chamber, a suction port and a discharge port;
A rotor provided in the pump chamber with a rotational axis eccentric to the discharge port with respect to the central axis;
It is attached to the rotor in a swingable manner, extends from the rotor to the outer diameter side of the pump chamber, and is configured so that the tip abuts against the peripheral wall of the pump chamber when swinging to the opposite side of the rotation direction of the rotor. With multiple blades and
The discharge port is provided in the casing so as to be movable in the rotation direction of the rotor,
The casing is
An inner casing provided with the inlet and having the pump chamber;
An outer casing provided around the central axis of the pump chamber on the outer peripheral side of the inner casing provided with the discharge port;
The inner casing is provided with a long hole facing the movable range of the discharge port in the rotation direction of the rotor, and a sealing material that seals between the inner casing and the outer casing around the long hole Is provided,
A sediment pressure pump for construction work configured such that the relative position of the discharge port with respect to the suction port in the rotation direction of the rotor is adjustable. A pump that is used in construction work to pump earth and sand,
A casing having a circular pump chamber, a suction port and a discharge port;
A rotor provided in the pump chamber with a rotational axis eccentric to the discharge port with respect to the central axis;
It is attached to the rotor in a swingable manner, extends from the rotor to the outer diameter side of the pump chamber, and is configured so that the tip abuts against the peripheral wall of the pump chamber when swinging to the opposite side of the rotation direction of the rotor. A plurality of feathers;
With
A plurality of the discharge ports are provided so as to be aligned in the rotation direction of the rotor, each of the plurality of discharge ports has an opening / closing mechanism,
An earth and sand pump for construction work , wherein the opening / closing position of the discharge port is adjusted by the opening / closing mechanism so that the relative position of the discharge port with respect to the suction port in the rotation direction of the rotor can be adjusted . A pump that is used in construction work to pump earth and sand,
A casing having a circular pump chamber, a suction port and a discharge port;
A rotor provided in the pump chamber with a rotational axis eccentric to the discharge port with respect to the central axis;
It is attached to the rotor in a swingable manner, extends from the rotor to the outer diameter side of the pump chamber, and is configured so that the tip abuts against the peripheral wall of the pump chamber when swinging to the opposite side of the rotation direction of the rotor. A plurality of feathers;
With
The discharge port is provided to extend in the rotation direction of the rotor, and the discharge port has an opening / closing mechanism capable of adjusting an opening / closing position in the extending direction,
An earth and sand pump for construction work , wherein the opening / closing position of the discharge port is adjusted by the opening / closing mechanism so that the relative position of the discharge port with respect to the suction port in the rotation direction of the rotor can be adjusted .   A shield machine comprising the earth and sand pump for construction work according to any one of claims 1 to 3, wherein the earth and sand pump feeds excavated earth and sand to the wellhead side.   A shield method for excavating a tunnel using the shield machine according to claim 4.

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