JP7586433B2 - Diaphragm wall drilling machine - Google Patents

Description

The present invention relates to a diaphragm wall excavator used to excavate the ground when constructing diaphragm walls underground.

As shown in Patent Document 1, a known continuous wall excavator used for the above purpose has a structure in which a leader (guide post) is supported upright on a freely movable base machine, and an excavation chain is attached to this leader. The excavation chain is supported by upper and lower sprockets and rotates in a vertical plane, and the ground can be excavated by excavation claws attached to the outer periphery of the excavation chain.

In the continuous wall excavation machine shown in Patent Document 1, the leader is supported so that it can be raised and lowered relative to the base machine, and the excavation chain can be gradually lowered deeper. The ground can be excavated using this excavation chain, and then the leader is raised and the base machine is moved, and excavation is repeated to excavate continuous holes in the ground. By injecting concrete into these continuous holes, it is possible to construct a continuous wall in the ground.

However, in the conventional continuous wall excavation machine shown in Patent Document 1, the leader is attached to the attachment (arm) at the front of the base machine so that it can rise and fall but cannot tilt. For this reason, there is no problem if the ground on which the base machine is placed is level, but if the ground is slightly inclined, the leader will also tilt slightly from the vertical position, and accordingly the excavated hole will also tilt slightly from the vertical. Here, vertical refers to the direction of gravity. In such cases, therefore, the base machine itself was tilted relative to the ground by inserting a plate or the like under the crawler of the base machine, and the leader was made vertical. However, this work was time-consuming and dangerous because it was done manually, which reduced work efficiency.

In addition, in the conventional continuous wall drilling machine shown in Patent Document 1, the angle of the leader relative to the attachment at the front of the base machine is fixed, so if you want to change the direction of drilling continuous holes using the drilling chain, you have to change the direction of the base machine itself. This creates the problem that in narrow places where it is difficult to change the direction of the base machine, the direction of the continuous holes that can be drilled is limited.

Japanese Patent Application Publication No. 8-319615

The main object of the present invention is therefore to provide a continuous wall excavator that can solve the above-mentioned problems of the conventional method and excavate holes vertically even when the ground is not horizontal but slightly inclined. Another object of the present invention is to provide a continuous wall excavator that can be easily used in narrow spaces where it is difficult to change the direction of the base machine.

The present invention, which has been made to solve the above-mentioned problems, is a continuous wall excavation machine in which an excavation chain stretched between upper and lower sprockets is attached to a leader supported by a base machine so that it can be raised and lowered, and the excavation chain is rotated to excavate the ground, the lower part of the leader is supported by an attachment at the front of the base machine via a horizontal shaft, and the upper part of the leader is connected to the tip of a hydraulic cylinder extending from the base machine, allowing the leader to be freely raised and lowered between a horizontal position and an upright position, the horizontal shaft can be swung a small angle in a vertical plane by left and right hydraulic cylinders around a spherical body in its center, and the lower part of the leader is connected to an arm that extends forward through the spherical body, making it possible to tilt the leader in an upright position by a small angle to the left and right .

The horizontal shaft can be supported by the spherical body so that it can rotate in any direction inside a hollow cylinder fixed to an attachment of the base machine. The leader can be provided with a rotatable cylindrical shaft inside, and the angle of the excavation chain stretched between the upper and lower sprockets can be changed by supporting the cylindrical shaft.

The continuous wall excavator of the present invention allows the leader to be tilted left and right by a small angle when in an upright position, so even if the ground on which the base machine is standing is not horizontal, the leader can be tilted to stand upright vertically. This makes it possible to excavate holes in the vertical direction without having to correct the position of the base machine to be horizontal as in the past. In addition, because the leader can be freely raised and lowered between a horizontal and upright position, the leader can be placed in a horizontal position and the vehicle height can be lowered when moving, making it easy to load onto a trailer and move to the construction site.

Furthermore, if the angle of the digging chain relative to the leader can be changed as in claim 3 , the digging direction of the continuous hole can be changed even in narrow places where the angle of the base machine cannot be changed significantly, making it easier to use.

FIG. 2 is an overall side view of the continuous wall excavation machine of the embodiment. FIG. 2 is an overall side view showing a state in which the reader is in a horizontal position. FIG. 4 is a front view showing the relationship between the excavation chain and the base machine. A vertical cross-section of the horizontal axis. FIG. FIG. 4 is a vertical cross-sectional view showing the relationship between the horizontal axis and the reader. FIG. 11 is a vertical cross-sectional view showing a state in which the horizontal axis is tilted to the left. FIG. 11 is a vertical cross-sectional view showing a state in which the horizontal axis is tilted to the right. FIG. 13 is a front view showing the reader tilted left and right. FIG. 11 is a plan view illustrating a digging angle range.

Figure 1 is an overall side view of a continuous wall excavation machine according to an embodiment. In this figure, 10 is a base machine, 11 is its crawler, and 12 is an attachment consisting of two strong steel plates on the left and right that protrude forward from the driver's seat.

13 is a rigid pillar called a leader, the lower part of which is supported by an attachment 12 of the base machine 10 via a horizontal shaft 14. The upper part of the leader 13 is connected to the tip of a rod 16 of a hydraulic cylinder 15 extending from the base machine 10. The horizontal shaft 14 will be explained in detail later.

The leader 13 is cylindrical, with a cylindrical shaft (not shown) penetrating through it. The lower part of the leader 13 is connected to the horizontal shaft 14 via a lower bracket 17, and the upper part of the leader 13 is connected to the rod 16 of a hydraulic cylinder 15 provided on the base machine 10 via an upper bracket 18. Therefore, by operating the hydraulic cylinder 15, the leader 13 can be raised and lowered around the horizontal shaft 14, and can be freely raised and lowered between the upright position shown in Figure 1 and the horizontal position shown in Figure 2.

As shown in FIG. 1, an arm member 19 is fixed to the upper end of a cylindrical shaft inside the leader 13, and pulleys 20 and 21 are provided on this arm member 19. A wire 22 extending from a winch (not shown) located inside the attachment 12 is wound around these pulleys 20 and 21. A lifting platform 23 that can rise and fall along the leader 13 is suspended from the tip of this wire 22.

Below the lifting platform 23, an excavation chain 24 is provided. As shown in FIG. 3, the excavation chain 24 is wound around upper and lower sprockets 25, 26, and excavation claws 27 are attached to the outer circumference of the excavation chain 24 at a constant pitch. The upper sprocket 25 is provided on the lifting platform 23, and the lower sprocket 26 is provided on the lower part of a casing 28 connected to the lower part of the lifting platform 23. Therefore, by rotating the upper and lower sprockets 25, 26, the excavation chain 24 can be rotated to excavate the ground. As shown in FIG. 1, the lower part of the casing 28 is supported by a support member 29 on the lower part of the leader 13 so that it can be raised and lowered, and the leader 13 and the excavation chain 24 are always kept parallel to each other.

Since the continuous wall excavation machine of the present invention has such a structure, the ground can be excavated by gradually lowering the lifting platform 23 by operating the wire 22. For example, if it is desired to form a continuous wall 2m deep, the lifting platform 23 is lowered 2m from a state in which the lower end of the excavation chain 24 is in contact with the ground while rotating the excavation chain 24 to perform excavation, and then the lifting platform 23 is pulled up by the wire 22 to raise the lower end of the excavation chain 24 above the ground, and in this state the base machine 10 is moved to repeat the same excavation.

Next, the structure of the horizontal shaft 14, which is a key part of the present invention, will be described. As shown in FIG. 4, the horizontal shaft 14 passes through the inside of a hollow cylinder 40 fixed to the attachment 12 of the base machine 10. The center part of the horizontal shaft 14 is a spherical body 41, which is supported inside the hollow cylinder 40 so that it can rotate in any direction. As shown in FIG. 5, an arm 42 is fixed to the spherical body 41, penetrating the spherical body 41 in a direction perpendicular to the axis of the horizontal shaft 14, i.e., in the front-to-rear direction. This arm 42 extends forward from the horizontal shaft 14, and as shown in FIG. 6, the lower part of the reader 13 is connected to this arm via a lower bracket 17.

As shown in Figure 4, hydraulic cylinders 44 are arranged facing upward on both the left and right sides of the horizontal shaft 14, and spherical bearings 46 are attached to the ends of their piston rods 45. Both ends of the horizontal shaft 14 are supported by these spherical bearings 46. Therefore, by operating the left and right hydraulic cylinders 44 as shown in Figures 7 and 8, the horizontal shaft 14 can be tilted by a small angle to the left or right in the vertical plane, centered on the spherical body 41. This small angle can be in the range of 0 to 5 degrees.

In the state shown in Figure 4, the horizontal shaft 14 is horizontal, and the arm 42 extending laterally from the spherical body 41 supports the reader 13 upright via the lower bracket 17. However, if the horizontal shaft 14 is tilted by a small angle as shown in Figures 7 and 8, the reader 13 also tilts by a small angle. This state is illustrated in Figure 9. Figure 9 shows the state when tilted 5° to the left and right.

As described above, the continuous wall excavator of the present invention can swing the horizontal shaft 14 by a small angle using the left and right hydraulic cylinders 44, and tilt the leader 13 connected to the arm 42 extending forward from this horizontal shaft 14 by a small angle to the left and right from an upright position. Therefore, even if the ground on which the base machine 10 is placed is not horizontal, the leader 13 and the excavation chain 24 can be corrected to a vertical position, and a hole can be excavated in the vertical direction without correcting the position of the base machine 10 to a horizontal position as in the past. Note that whether the leader 13 is vertical or not can be confirmed by an instrument, and the operator can manually control the left and right hydraulic cylinders 44, or they can be automatically controlled in conjunction with the instrument.

In this embodiment, the mechanism for correcting the inclination of the reader 13 is stored compactly inside the attachment 12 located in front of the base machine 10, which has the advantage that there is no need to enlarge the overall size of the device.

Furthermore, if a cylindrical shaft is rotatably provided inside the leader 13 as in this embodiment, the casing 28 and the excavation chain 24 can be rotated in a horizontal plane relative to the leader 13, so that the ground can be excavated at any angle relative to the base machine 10 as shown in FIG. 10. FIG. 10 shows states A, B, and C in which the driver's seat and the attachment 12 are rotated 30 degrees each while the base machine 10 is kept in a fixed position. Even with the conventional device shown in Patent Document 1, it is possible to rotate the driver's seat and the attachment 12. However, the device of this embodiment can further change the angle of the excavation chain 24 around the leader 13 located at the tip of the attachment 12 by rotating the cylindrical shaft inside the leader 13. For example, in FIG. 10, the excavation chain 24 can be further rotated from state A to angle A-1, or from state C to angle C-1. This allows the direction in which the continuous hole is excavated by the excavation chain 24 to be significantly changed, greatly improving usability in narrow spaces where it is difficult to change the direction of the base machine 10.

As explained above, the present invention is a highly practical continuous wall drilling machine that solves the problems of the past.

REFERENCE SIGNS LIST 10 Base machine 11 Crawler 12 Attachment 13 Leader 14 Horizontal shaft 15 Hydraulic cylinder 16 Rod 17 Lower bracket 18 Upper bracket 19 Arm member 20 Pulley 21 Pulley 22 Wire 23 Lifting platform 24 Excavation chain 25 Sprocket 26 Sprocket 27 Excavation claw 28 Casing 29 Support member 40 Hollow cylinder 41 Spherical body 42 Arm 44 Hydraulic cylinder 45 Piston rod 46 Spherical bearing

Claims (3)

A continuous wall excavation machine in which an excavation chain stretched between upper and lower sprockets is attached to a leader supported by a base machine so as to be capable of ascending and descending, and the excavation chain is rotated to excavate the ground,
The lower part of the leader is supported by a horizontal shaft on an attachment at the front of the base machine, and the upper part of the leader is connected to the tip of a hydraulic cylinder extending from the base machine, so that the leader can be freely raised and lowered between a horizontal state and an upright state.
The horizontal shaft can be swung by a small angle in a vertical plane around a central spherical body by means of left and right hydraulic cylinders.
A continuous wall excavating machine characterized in that the leader in an upright position can be tilted to the left and right by a small angle by connecting the lower part of the leader to an arm that extends forward through the spherical body . 2. The continuous wall excavating machine according to claim 1, wherein the horizontal axis is supported by the spherical body inside a hollow cylinder fixed to an attachment of a base machine so as to be rotatable in any direction . A continuous wall excavation machine as described in claim 1, characterized in that the leader has a rotatable cylindrical shaft therein, and this cylindrical shaft supports an excavation chain stretched between upper and lower sprockets, making it possible to change the angle of the excavation chain relative to the leader .