JP2007169892A - Rotary rod type rectangular vertical hole excavating working machine by reuleaux mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary rod type excavating working machine which excavates a rectangular vertical hole without impeding crushing and grain refining of excavated sediment. <P>SOLUTION: The upper end of an inner rod 8a vertically provided through a grout supply pipe is bendably connected to a lower end axis part of an inner drive shaft 7a through a universal joint 14, and a shaft 15 of a triangular cutter 9 is bendably connected to the lower end of the rod through a universal joint 16. The shaft 15 is supported to an eccentric bearing 13 in a state of the triangular cutter 9 being located at the lower end of an outer hollow rod 8b. The triangular cutter 9 is rotated by the rotation of the inner rod 8a, and the triangular cutter is put in circular motion to revolve by the rotation of the outer rod 8b with the inner rod 8a as a conical pendulum. When the inner rod is reversely rotated while the outer rod 8b is normally rotated at the rotation ratio 1:3 of the inner rod 8a to the outer rod 8b, therefore, the triangular cutter 9 carries out rectangular excavation by the principle of a Reuleau mechanism. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a vertical hole excavation work provided with a rotary excavation work rod such as a excavation screw rod, excavation agitation rod, excavation rod used for various purposes such as excavation and construction of underground continuous walls such as water blocking walls The present invention relates to a rotary rod type rectangular vertical hole excavation work machine that is equipped with a triangular cutter based on a roulau mechanism on the rotary excavation work rod and enables rectangular vertical hole excavation.

  Conventionally, for example, in order to excavate a continuous underground water blocking wall, a drilling agitation rod is connected to the output shaft of a rotary drive unit supported by a mast so as to be movable up and down, and a circular hole is drilled at the lower end of the excavation agitation rod. 2. Description of the Related Art A rotating rod type circular vertical hole excavator and agitator connected to a power excavation head is widely used.

  However, in the excavation construction of the water blocking wall using the above-mentioned conventional machine, cement milk is injected while excavating a circular vertical hole partially wrapped with the adjacent circular vertical hole, and a continuous column array of soil cement cylinders. However, since a constriction over the entire length of the cylinder is formed at the contact circle between adjacent soil cement cylinders, the above-mentioned constricted portion can be obtained even if the circular vertical holes are partly wrapped. If the core material such as H-shaped steel is built inside the soil cement continuous wall, it must be built at the center of the soil cement cylinder. There is also a drawback that the underground continuous wall cannot be adjusted to a desired strength by appropriately changing the interval between the core materials according to the use of the continuous wall.

  Therefore, a rectangular horizontal hole drilling device using a triangular cutter based on the theory of the roulau mechanism is known as a technology that has been conventionally used in shield machines for excavating large diameter horizontal holes such as tunnels. The development of a new rectangular vertical hole drilling machine applied to the rotary drilling rod has been proposed.

However, since the above-mentioned shield machine has a large excavation cross section, it was possible to attach a large triangular cutter rotation drive device including a planetary gear mechanism, a motor, a speed reducer, etc. to the face portion of the machine. It is structurally difficult to attach such a large driving device to the lower end portion or the middle portion of the rotary excavation work rod, especially when the large driving device is attached to the middle portion of the drilling screw rod, the excavation soil is transported upward by the screw. When the road is narrowed or blocked and attached to the middle part of the excavation stirrer rod, the excavated sediment is crushed and crushed with the stirring blade and then held in the excavation hole in preparation for mixing with cement milk. I can't.
JP-A-6-336898 JP-A-7-91176 Japanese Patent Fair 8-9950

  The present invention can be equipped with a large-sized driving device for driving rectangular excavation of a triangular cutter based on the roulau mechanism without hindrance, and inhibits upward conveyance of the excavated soil and crushing and pulverization in the excavation hole. It is an object of the present invention to provide a rotating rod type rectangular vertical hole excavation work machine that does not occur.

To achieve the above object, the present invention provides:
A rotary drive device including a prime mover and a speed reducer is supported on a support standing on the ground so as to be movable up and down, and the inner rod is inserted into the outer hollow rod as a conical pendulum so as to be capable of circular motion. One or a plurality of upper end portions of the composite excavation work rod are connected and suspended, and the rotation ratio of the inner rod and the outer hollow rod is 1: 3 so that the rotation is opposite to each other.
The outer hollow rod is provided with working blades on the outer peripheral surface as necessary,
The inner rod has an upper end connected to the rotary drive device via a universal joint, and a lower end connected to the shaft of the triangular cutter via a universal joint,
The triangular cutter has a larger diameter than the outer hollow rod, and is external to the lower end of the triangular cutter so that the cutter shaft is rotatably supported at the eccentric position of the lower end surface of the outer hollow rod. Rotated and revolved at the time of rectangular excavation,
This paper proposes a rotary rod type rectangular vertical hole excavator with a roulau mechanism.

  According to the rotating rod type rectangular vertical hole excavation work machine using the roulau mechanism of the present invention, the rectangular vertical hole excavation work by the roulau mechanism can be realized, and the rotation and revolution of the triangular cutter can be rotated 1: 3. Since the rotary drive device for adjusting the ratio is supported by the ground support, it can be easily equipped even if it is large, and the composite excavation work rod that digs into the ground and the inner wall surface of the excavation hole Therefore, when screw blades are provided on the outer peripheral surface of the outer hollow rod, the upward conveyance of the excavated soil is effectively performed. Can be held in the space in preparation for mixing with cement milk.

  FIG. 1 shows an example of a biaxial agitating excavator for water blocking wall construction. Guide rails (3) and (3) are provided on the front side of a mast (2) supported upright at the front end of a base machine (1). , And the rotational drive box (4) is supported on the guide rails (3) and (3) so as to be slidable up and down, and the box (4) is suspended from the top sheep (5). 2), and the rotary drive device built in the box (4) has two composite drive shafts (7) each comprising an inner drive shaft (7a) and an outer drive shaft (7b), (7) is connected and the lower ends of both composite drive shafts protrude in parallel from the lower surface of the box (4). The composite drive shafts (7) and (7) are connected to the inner rod (8a) and the outer hollow rod (8b). ) And two composite rectangular hole drilling stirring rods (8) and (8). It is parallel to droop linked, respectively. A triangular cutter (9) is provided at the lower end of the inner rod (8a), and stirring blades (10) are provided on the outer peripheral surface of the outer rod (8b). Both composite rods (8), (8) are rotated in opposite directions.

  (11) is a steady stop for the composite rods (8) and (8), and (12) is a connecting plate for both composite rods (8) and (8).

  The composite rectangular hole excavation stirring rod (8) is as follows. In FIG. 2 (a), first, the outer hollow rod (8b) is a hollow cylindrical body having an inner diameter of about three times the outer diameter of the inner rod (8a), and stirring blades (10). In addition to projecting over the entire length, an eccentric bearing (13) is provided at the eccentric position of the lower end surface, and the upper end of the outer rod (8) is connected to the cylindrical outer drive shaft (7b) of the composite drive shaft (7). It is connected.

  The inner rod (8a) is a cylindrical rod having a shaft extending through a grout supply pipe, and the upper end of the inner rod (8a) is concentrically located in the outer drive shaft (7b). The lower end surface shaft center portion is flexibly connected via a universal joint (14), and the lower end of the rod is flexibly connected to the shaft (15) of the triangular cutter (9) via a universal joint (16). The shaft (15) is supported on the eccentric bearing (13) with the triangular cutter (9) positioned outside the lower end of the outer hollow rod (8b).

  The triangular cutter (9) has an excavating diameter larger than the outer diameter of the outer rod (8b). As shown in FIG. 15) is fixed through the arms (18), and a number of bits (19) are protruded from the lower surfaces of the frame (17) and the arms (18).

  In the above configuration, the triangular cutter (9) rotates by the rotation of the inner rod (8a), but the inner rod (8a) serves as a conical pendulum by the rotation of the outer rod (8b). It will be revolved by making the circle move.

  Therefore, now, when the inner rod (8a) (triangular cutter) is reversed, the outer rod (8b) is rotated forward, and the rotation ratio of the inner rod (8a) to the outer rod (8b) is respectively rotated by 1: 3, The triangular cutter (9) performs square excavation as shown by the excavation line (R) in FIG.

  In this example, the length of one side of the square excavation line (R) of the triangular cutter (9) is equal to the stirring diameter of the stirring blades (10) as shown in FIG.

  Between the two adjacent composite excavation stirring rods (8), (8), the vertical positions of the triangular cutters (9), (9) are shifted stepwise as shown in FIG. Each side portion of (R) and (R) is wrapped as shown in FIG. 2 (d), and the stirring blades (10), (10) are shifted in a staggered manner and between adjacent stirring blades. It is in a positional relationship that partly eats.

  In FIG. 2 (a), (20) is a flexible connection hose that connects the grout supply pipes respectively passed through the inner drive shaft (7a) and the inner rod (8a) beyond the universal joint (14). 21) is a flexible connection hose that connects the grout supply pipes respectively passed through the inner rod (8a) and the triangular cutter shaft (15) beyond the universal joint (16). A grout discharge port is provided at the lower end of the triangular cutter shaft (15).

  The rotary drive device for transmitting the rotation to the composite drive shaft (7) is as follows. In FIG. 3, a substantially cylindrical outer drive shaft (7b) is rotatably supported via a bearing (23) in a lower gear box (22) in the box (4), and a long inner drive shaft (7a). The lower half of the inner drive shaft (7a) is rotatably supported concentrically through the bearing (24) in a state where the lower half is inserted into the outer drive shaft (7b), and the upper half of the inner drive shaft (7a) is supported by the gear box (22). Is supported rotatably via a bearing (25), a large gear (26) is fixed to the upper part of the inner drive shaft (7a), and a gear (27) is fixed to the outer periphery of the upper end of the outer drive shaft (7b). It is.

  On the other hand, a geared motor (28) is installed on the gear box (22), and the output shaft (29) of the motor (28) is suspended in the gear box (22) and rotated by bearings (30) and (31). The small gear (32) fixed to the upper portion of the output shaft (29) is meshed with the large gear (26), and the gear (33) fixed to the lower portion of the output shaft (29) is idle gear. Meshed with the gear (27) via (34). In this case, the gear ratio between the small gear (32) and the large gear (26), and the gear (33) and the gear so that the rotation ratio between the inner drive shaft (7a) and the outer drive shaft (7b) is 1: 3. The gear ratio of (27) is adjusted. (35) and (36) are bearings for supporting the shaft of the idle gear (34).

  (37) is a pressure feed hose for the grout connected to the grout supply pipe of the inner drive shaft (7a) via a swivel joint.

  The other composite excavation stirring rod (8) has the same structure as described above and includes the same rotational drive device.

  The operation of the above example will be described together with the work. When the geared motors (28) and (28) are started from the state of FIG. 1, the rotation of the output shaft (29) of each motor passes through the gears (32) and (26) to the inner drive shaft (7a) and the gear (33 ), (34), and (27), respectively, are transmitted to the outer drive shaft (7b), and the inner drive shaft (7a) and the outer drive shaft (7b) rotate in opposite directions at a rotation ratio of 1: 3. Accordingly, the inner rod (8a) and the outer rod (8b) of both composite rods (8) and (8) are rotated in opposite directions at a rotation ratio of 1: 3, whereby a triangular cutter is obtained. (9), (9) rotates and revolves at a rotation ratio of 1: 3, starts square excavation rotation based on the principle of the roulau mechanism, and the stirring blades (10) ..., (10) ... rotate respectively. .

  When excavating into the ground by the rotating composite rods (8) and (8), the triangular cutters (9) and (9) perform excavation of two partially wrapped vertical square holes and the stirring blades (10 ) ..., (10) ... the excavated soil is agitated.

  In the above excavation, since the space between the inner wall surface of the square vertical hole to be excavated and the outer rod (8b) is secured over the entire length of the vertical hole, the earth and sand excavated by the triangular cutter (9), (9) As the digging progresses, the space rises relatively, and during that time, the agitation blades (10), (10), are released from compaction and repeatedly moved up and down in the space while being crushed and finely divided. Prepare for mixing with the next cement milk.

  After excavating the double square vertical hole of a predetermined depth, the composite rods (8) and (8) are gradually pulled up while rotating the inner and outer rods (8a) and (8b), together with the triangular cutter shaft (15 ), (15) Cement milk is poured into the vertical hole from the lower end. Thus, the cement milk and the excavated earth and sand are stirred and mixed by the stirring blades (10), (10), and a soil cement is formed.

  The biaxial composite rods (8) and (8) lifted to the ground are excavated in the same manner as described above in a state of being partially wrapped next to the above-mentioned two square vertical holes, and then cemented. Milk injection is performed to form a soil cement, and this is repeated in the same manner to form a soil cement underground wall.

(A) It is a front view of the biaxial rectangular vertical hole excavation work machine by this invention. (B) It is a side view of the same as above. (A) It is an expanded longitudinal cross-sectional view of a composite excavation stirring rod part. (B) It is a bottom view of the same as above. (C) (A) It is an AA line sectional view of a figure. (D) It is the bottom view except the triangular cutter of the biaxial compound excavation stirring rod. It is an expansion vertical side view of a rotation drive device.

Explanation of symbols

2 Mast 4 Rotation Drive Box 8 Combined Drilling Stir Rod 8a Inner Rod 8b Outer Inner Empty Rod 9 Triangular Cutter 10 Stirring Blade 13 Eccentric Bearing 14, 16 Universal Joint 15 Triangular Cutter Shaft 28 Geared Motor

Claims (1)

A rotary drive device including a prime mover and a speed reducer is supported on a support standing on the ground so as to be movable up and down, and the inner rod is inserted into the outer hollow rod as a conical pendulum so as to be capable of circular motion. One or a plurality of upper end portions of the composite excavation work rod are connected and suspended, and the rotation ratio of the inner rod and the outer hollow rod is 1: 3 so that the rotation is opposite to each other.
The outer hollow rod is provided with working blades on the outer peripheral surface as necessary,
The inner rod has an upper end connected to the rotary drive device via a universal joint, and a lower end connected to the shaft of the triangular cutter via a universal joint,
The triangular cutter has a larger diameter than the outer hollow rod, and is external to the lower end of the triangular cutter so that the cutter shaft is rotatably supported at the eccentric position of the lower end surface of the outer hollow rod. Rotated and revolved at the time of rectangular excavation,
Rotating rod type rectangular vertical hole excavating machine with roulau mechanism.

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