JP4063980B2 - Underground continuous wall excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground continuous wall excavator that creates a continuous wall in the ground.
[0002]
[Prior art]
As a means to create a continuous wall in the ground, a cutter head is rotatably provided at the lower end of the excavator body inserted into the ground, and the ground is excavated by this cutter head, and a stable liquid such as excavated soil and bentonite An excavator that kneads and builds underground walls is used.
[0003]
In the conventional excavator, the cutter head is provided in a fixed position, and a continuous wall is formed while excavating a slot having a predetermined width by the cutter head. In other words, the cutter head is supported on the left and right of the holder protruding from the lower end of the excavator main body inserted into the ground so as to be rotatable about a horizontal axis. It is made to dig the ground with a bit.
[0004]
[Problems to be solved by the invention]
However, in the conventional excavator, since the cutter head is fixedly positioned at a position corresponding to the width of the excavator body, only a slot having a constant width can be excavated. In order to create a continuous wall having a digging width and a shape, there has been a problem that an excavator that can correspond to each case must be used or the cutter head must be replaced.
[0005]
In addition, when forming an enlarged portion as a base at the bottom of the continuous wall, a separate dedicated machine for carrying out enlarged digging must be prepared separately, which not only reduces work efficiency but also increases the construction cost. there were.
[0006]
The present invention solves the above-mentioned problems of the prior art, and can cope with the excavation of slots having various excavation widths, and can expand an excavation of a desired shape at the bottom of the continuous wall, so that one excavator An object of the present invention is to provide an underground continuous wall excavator capable of responding more efficiently.
[0007]
[Means for Solving the Problems]
The present invention as means for solving the problems is the diaphragm wall excavator to construct a continuous wall in the ground while excavating the ground, the lower end of the excavating machine body to be inserted into the ground, the excavation direction cutter holder the guide rails to be guided to linearly move to a horizontal direction perpendicular provided, mounted for movement by sliding the cutter holder to the guide rail, a pair of cutter drums at the bottom of the cutter holder in the horizontal direction is the axial direction The cutter drums are provided so as to be movable independently of each other, and the leading ends of the cutter drums can protrude outward from the outer surface of the excavator body.
[0008]
In this way, when the excavation width of the excavation bottom part is slightly enlarged, the cutter drum is horizontally moved independently, and the tip of the excavator protrudes from the outer surface of the excavator body to further expand the excavation width of the excavation bottom part. At the time of excavation, the cutter holder is moved in the horizontal direction to increase the amount of protrusion of the cutter drum, thereby enabling further expansion excavation. In addition, by combining these horizontal movements and the vertical movement of the excavator body, it is possible to expand the desired desired excavation width and shape.
[0009]
Providing detection means for detecting the amount of water movement in the left-right direction of the cutter holder and each cutter drum makes it possible to objectively grasp the protruding position of the cutter drum, enabling more accurate excavation width and shape expansion. Become. Further, by arranging the cutter bits on both the front and rear end surfaces of the cutter drum, the excavation efficiency when the excavator body is excavated can be increased.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0011]
1 (A) and 1 (B) show the front and side of an essential part of an underground continuous wall excavator according to the present invention, and an excavator main body 1 suspended by a wire on a work machine (not shown) as in the prior art. Are provided with a plurality of vertically long grippers 3, 3... Which are pressed against the inner wall surface of the excavation hole 2 formed in the ground so as to be able to advance and retreat by hydraulic drive. The excavator body 1 has a pair of left and right cutter drums 4 and 4 at the lower end.
[0012]
Further, a mud pump 5 is installed in the excavator main body 1, and surplus liquid such as excavated mud water and bentonite is sucked from a suction port 6 opened at the lower end of the main body 1 and collected through the mud pipe 7. However, the stabilizer is used in a circulating manner.
[0013]
As shown in the enlarged sectional view of FIG. 2, the cutter drums 4 and 4 and their supporting structure are attached to a guide rail 8 provided in the horizontal direction near the lower end of the excavator body 1 so that the cutter holder 9 can be slid in the horizontal direction. The cutter holder 9 is fixed to the cylinder portion 12 of a double rod type holder cylinder 11 in which both ends of the rod 10 are fixed to the excavator body 1, and pressurized oil is applied to the right or left of the cylinder portion 12 of the holder cylinder 11. By feeding, the cutter holder 12 moves to the left or right together with the cylinder portion 12.
[0014]
Guide cylinders 14 and 14 are fixed in the horizontal direction on the left and right side surfaces of the support portion 13 that hangs downward from the cutter holder 9. Inside the guide cylinders 14 and 14, sliding cylinders 15 and 15 provide seals 16 and 16. The drum cylinders 18 and 18 are connected between the support plates 17 and 17 in the slide cylinders 15 and 15 and the support portion 13 of the cutter holder 9. The sliding cylinders 15 and 15 are configured to move in the horizontal direction after moving back and forth by the expansion and contraction of the cylinders 18 and 18.
[0015]
The cutter drums 4, 4 are fitted to the outer peripheral portions of the guide cylinders 14, 14, and the bearing portions 4 a on the inner periphery of the rear ends of the cutter drums 4, 4 and the outer periphery of the front end portions of the guide cylinders 14, 14. The cutter drums 4, 4 are supported by the bearing portion 14a so as to be rotatable about the axis thereof with respect to the guide cylinders 14, 14.
[0016]
Further, hydraulic or electric motors M, M for driving the cutter drum are attached to the tips of the sliding cylinders 15, 15, and rotors 19, 19 rotated by the motors M, M are fixed to the cutter drums 4, 4. The left and right cutter drums 4 and 4 are independently rotated by driving the motors M and M.
[0017]
The cutter drums 4 and 4 are respectively provided with cutter bits 20, 21, and 22 projecting from the front end surface 4b, the outer peripheral surface 4c, and the rear end surface 4d. The cutter bit 21 on the outer peripheral surface 4c is shown in FIG. ) Are arranged in a spiral direction.
[0018]
These cutter drums 4, 4 are excavated at the tips of the cutter bits 20, 20,... On the tip surface 4b of the cutter drums 4, 4 when the cutter holder 9 is in the neutral position and the drum cylinders 18, 18 are shortened. The dimension is set to a position slightly protruding from the outer surface of the machine body 1.
[0019]
The cutter holder 9 and the cutter drums 4, 4 are provided with detection means 23, 24, 24 for detecting the movement amounts of the cutter holder 9 and the cutter drums 4, 4. A potentiometer can be used as the detection means 23, 24, 24. The detection data is transmitted to the ground, and the state and amount of protrusion of the cutter drums 4, 4 to the left and right are quantitatively grasped to form a drilling hole. The amount of the expanded digging and the shape of the bottom of 2 can be confirmed.
[0020]
Next, the operation of the above embodiment will be described with reference to FIGS.
[0021]
When digging holes in the ground, the excavator body 1 is suspended and the drive motors M and M for the cutter drums 4 and 4 are driven to rotate the cutter drums 4 and 4 until the starting point a for expanded digging. Excavation is performed (shown in FIG. 4A). At this time, the soil removal is performed by circulating a stabilizing liquid filling the inside of the pit as in the prior art.
[0022]
Next, when expanding the right side, the excavator body 1 is lowered while gradually expanding the drum cylinder 18 of the cutter drum 4 on the side to be expanded (the right side cutter drum in the figure), and the right side expanded digging is performed. Start (shown in FIG. 4B). During this time, the extension amount of the drum cylinder 18 is always detected by the detecting means 24 (potentiometer) to adjust the descending speed of the excavator body 1.
[0023]
When the drum cylinder 18 is fully extended, pressure oil is supplied to the left side of the cylinder portion 12 of the holder cylinder 11 to move the cutter holder 9 to the right, and the excavation operation is continued to a predetermined depth, thereby expanding the right side of the excavation. The process ends (shown in FIG. 4C).
[0024]
When the predetermined depth is reached as described above, the drum cylinder 18 is shortened to retract the cutter drum 4, and the holder cylinder 11 is operated in the reverse direction to return the cutter holder 9 to the neutral position (FIG. 4D). Shown).
[0025]
In this state, the excavator body 1 is pulled up and returned to the above-mentioned enlarged digging start point a (shown in FIG. 5A), and this time the excavator body 1 is gradually extended while the drum cylinder 18 of the left cutter drum 4 is gradually extended. Is started, and the left side expansion digging is started (shown in FIG. 5B).
[0026]
When the drum cylinder 18 is fully extended, the holder cylinder 11 is operated in the opposite direction to move the cutter holder 9 to the left, and the excavation to the predetermined depth is continued, thereby completing the left-side expanded excavation (see FIG. 5 (C) shown).
[0027]
Thereafter, the cutter drum 4 is retracted and the cutter holder 9 is returned to the neutral position, and the excavator body 1 is pulled up.
[0028]
Note that the relationship between the projecting motion of the cutter drums 4 and 4 and the vertical motion of the excavator body 1 is not limited to the above work procedure. 4 and 5 show the case where the vertical cross-sectional shape of the enlarged digging portion is a substantially trapezoidal upper concavity, but the excavation is performed by causing the cutter drum 4 to project forward at the enlarged digging start point a and then descending. Thus, it is possible to perform an expansion digging having a shape and size according to the design, such as performing an expansion digging with a rectangular vertical cross section.
[0029]
In order to correspond to the groove width (thickness of the continuous wall) at the time of drilling, the amount of protrusion of the cutter drums 4, 4 in the left-right direction is determined at the start of excavation, and then excavated after matching the groove width.
[0030]
【The invention's effect】
As described above, according to the present invention, an underground continuous wall having various widths and shapes can be excavated and an enlarged portion can be formed at the bottom. There is no need to prepare a separate machine, which can significantly increase work efficiency.
[Brief description of the drawings]
1A and 1B are external views of main parts of an underground continuous wall excavator according to the present invention, wherein FIG. 1A is a front view, and FIG.
FIG. 2 is an enlarged side view showing a cross section of a part of the main part.
3 is a view corresponding to FIG. 2 showing a state in which the right cutter drum protrudes rightward in FIG. 2;
FIGS. 4A to 4D are explanatory views showing an example of the action. FIGS.
FIGS. 5A to 5C are explanatory views showing an example of the action. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator main body 2 Excavation hole 3 Gripper 4 Cutter drum 5 Waste mud pump 8 Guide rail 9 Cutter holder 11 Holder cylinder 12 Cylinder part 14 Guide cylinder 15 Sliding cylinder 18 Drum cylinder 20, 21, 22, Cutter bits 23, 24 Detection means ( Potentiometer)

Claims (5)

In the underground continuous wall excavator that creates a continuous wall in the ground while excavating the ground, it is a guide to move the cutter holder linearly in the horizontal direction perpendicular to the excavation direction at the lower end of the excavator body inserted into the ground the guide rail is provided, the guide rail the cutter holder slide mounted movably, movably provided a pair of cutter drums at the bottom of the cutter holder independently of each other in the horizontal direction is the axial direction, these cutters An underground continuous wall excavator characterized in that the tip of the drum can protrude outward from the outer surface of the excavator body. 2. The underground continuous wall excavator according to claim 1, wherein the cutter holder is attached to a double rod type cylinder portion in order to move the entire pair of cutter drums in the horizontal direction. A pair of guide cylinders are vertically provided on the cutter holder, and sliding cylinders are slid into the guide cylinders, and drum cylinders are provided for moving the sliding cylinders independently. The underground continuous wall excavator according to claim 2, wherein a drum is fitted so as to be movable together with the sliding cylinder. The underground continuous wall excavator according to any one of claims 1 to 3, further comprising detection means for detecting an axial horizontal movement amount of the cutter holder and each cutter drum. The underground continuous wall excavator according to any one of claims 1 to 3 , wherein cutter bits are disposed on both front and rear end surfaces in the axial direction of the cutter drum.

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