JPH0624430Y2 - Ground excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a ground excavator, and more particularly to a device for vertically excavating a hole by a cutter head provided at a lower end portion of a guide frame suspended by a cable or the like. .

<< Conventional technology >> One of the ground excavators is a hydrophrase excavator. This excavator is provided with a guide frame that is suspended in an excavation hole, a cutter head that is provided at the lower end of the guide frame to excavate underground, and an excavator that is provided above the cutter head to suck excavated earth and sand. It is equipped with a pump for pumping mud. The cutter head is provided with a pair of horizontally disposed cutter drums, the central portion of which is supported by the guide frame side, and the rotation of the cutter drums causes the excavation while descending in the ground. The excavated earth and sand rolled up toward the central portion by the rotation in the direction is sucked up together with mud by the lifting pump, and is discharged to the ground surface side through the lifting pipe arranged in the frame.

<Problems to be solved by the invention> For example, when excavating the ground for constructing a continuous underground wall, increase the width of the hole only in the part where the earth pressure is large, and increase the thickness of the wall in other parts. There is a demand to make it larger. However, the above-mentioned hydro-phrase excavator can only excavate a hole of a certain width in the vertical direction, it cannot expand the width of the hole in the middle of the hole, and it has not been possible to meet the above requirements. .

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to add a simple structure to the above-described hydro-phrase excavator so that the width of the hole can be partially cut in the middle of the excavation hole. The goal is to be able to expand it.

<< Means for Solving the Problem >> In the ground excavator according to the present invention, the cutter head disposed at the lower end portion of the guide frame is horizontally disposed with the central portion supported on the guide frame side. It has a plurality of support drums provided with a rotating disk which is driven to rotate by a motor, and cutter drums mounted on both sides of a central support portion of each support drum. This cutter drum has excavating blades on its outer peripheral surface and outer end surface, is configured to rotate integrally with the rotating disk and move along the axial direction thereof, and the cutter drum is supported with respect to the supporting drum. It has widening drive means for sliding displacement in the direction.

<< Operation >> By slidably displacing the cutter drum with respect to the support drum by the widening drive means, the distance between the end surfaces of the cutter drums mounted on both end sides of the support drum changes. The distance between the end faces is the width of the hole to be drilled.

<< Embodiment >> FIG. 1 shows an overall schematic configuration of a ground excavator according to an embodiment of the present invention. The guide frame 1 has a vertically long shape, and an upper end portion thereof is supported by a cable or the like and is suspended substantially vertically. A correction device 2 that comes into contact with the wall surface of the excavation hole is provided at a required position on a side portion of the guide frame 1. The correction device 2 expands and contracts in the lateral direction by a link mechanism and a hydraulic drive mechanism, and corrects the position of the guide frame 1 in the excavation hole.

The cutter head 3 is attached to the lower end of the guide frame 1. The cutter head 3 has a pair of supporting drums 4 and 4 arranged horizontally. The support drum 4 is fixed to the guide frame 1 via a support plate 5 at the center thereof. Cutter drums 6 are attached to both ends of the support drum 4.

The details of the coupling relationship between the cutter drum 6 and the support drum 4 are shown in FIG. A motor 7 is provided at the tip of the support drum 4.
A rotary disk 8 driven to rotate by is coaxially attached. The cutter drum 6 has a cylindrical shape with one end closed, and an excavating blade 9 is attached to the outer peripheral surface of the cutter drum 6, and an excavating blade 10 called a side cutter is provided on the outer end surface.
Is installed. Further, the cylindrical portion of the cutter drum 6 is a double cylinder and is mounted concentrically with the support drum 4 and the rotary disk 8 so as to cover them, and the spline engagement portion 11 causes the cutter drum 6 to rotate with the rotary disk 8. The cutter drum 6 is coupled to rotate the cutter drum 6 integrally with the rotary disc 8, and the cutter drum 6 is slidably displaced in the axial direction of the rotary disc 8 and the support drum 4.

Further, as shown in FIG. 2, a large number of hydraulic cylinders 12 as the above-described widening drive means are arranged in the gap between the inner cylinder part and the outer cylinder part of the double cylinder of the cutter drum 6. The base portion of the hydraulic cylinder 12 is fixed to the support plate 5, and the tip end portion of the piston rod 13 of the hydraulic cylinder 12 is engaged with the bearing portion 14 inside the end surface of the cutter drum 6. Hydraulic cylinder 12
Is fixed to the support plate 5 and maintained in a posture parallel to the axial direction of the cutter drum 6, and the piston rod 13 is engaged by the bearing portion 14 so as not to hinder the rotation of the cutter drum 6.

A large number of the hydraulic cylinders 12 are provided at regular intervals along the circumference of the cutter drum 6, and their hydraulic pipes are connected to hydraulic equipment provided on the ground side. The solid line state in FIG. 2 and FIG. 1 (A) show the hydraulic cylinder 12 in the most contracted state. When the hydraulic cylinder 12 is extended from this state, the dotted line in FIG. 2 and FIG. 1 (B) are obtained. As shown, the cutter drum 6 is slid and displaced along the axis of the support drum 4, and the cutter drum 6 moves away from the support plate 5.

As shown in FIG. 1 (C), the cutter drums 6 mounted on the two support drums 4 are rotated in the opposite directions as indicated by the arrows, and the mud pump 15 provided above the cutter heads 3 is rotated. The excavated earth and sand is rolled up with muddy water toward the suction port. The excavated earth and muddy water is sucked by a pump for mud pumping and discharged to the ground through a pipe provided in the frame 1.

FIG. 3 shows how the ground excavator is used. First, as shown in (A), the hydraulic cylinder 12 is contracted so that the cutter drum 6 is closest to the support plate 5,
A hole 16 having a normal width (narrowest width) is excavated. Then, the ground excavator is once pulled up to a predetermined position, the hydraulic cylinder 12 is extended as shown in (B), and the cutter drum 6 on one side is extended.
When excavating while sliding and moving to a position away from the support plate 5, the hole 16 is laterally widened by the excavating blade 10 (side cutter) of the cutter drum 6, and the ground excavator is lowered in the widened state. Then, as shown in the figure, the widened portion 16a can be formed only in a part of the hole 16.

The rebar cage 20 is inserted into the widened portion 16a thus excavated as shown in FIGS. 4 (A) and 4 (B).

In the example shown in the figure, the widening reinforcing bar 21 installed in the widening part 16a is hinged to a predetermined position of the reinforcing bar cage 20, and is inserted into the hole 16 in a state of being laid down via the hinge ( See FIG. 4 (A).

Then, when the rebar cage 20 is set to a predetermined state, the wire rope 22 connected to one end of the widening bar 21 is pulled from the ground side to cause the widening bar 21 so that the widening bar 21 is expanded. Located in.

<< Effects of the Invention >> As described in detail above, the ground excavator according to the present invention has the rotating disk mounted on the supporting drum and the cutter drum covering the rotating disk, and the cutter drum with respect to the supporting drum. Since it is slidable in the axial direction and provided with a widening drive mechanism that drives this sliding displacement, the hole width can be reduced by excavating the middle part of the excavated hole with a cutter drum that is displaced so as to expand in the lateral direction. It can be easily enlarged partially.

[Brief description of drawings]

FIG. 1 is a front view (A) and (B) and a side view (C) of a ground excavator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an essential part of the same embodiment, and FIG. 3 (A). (B) is an explanatory view showing a usage mode of the ground excavator according to the embodiment, and FIG. 4 is an explanatory view when inserting a rebar cage into a hole excavated by the excavator. 1 ... Guide frame, 2 ... Correction device 3 ... Cutter head, 4 ... Support drum 5 ... Support plate, 6 ... Cutter drum 7 ... Motor, 8 ... Rotating disk 9 ... Drilling blade, 10 ...... Drilling blade 11 ...... Spline connection part, 12 ...... Hydraulic cylinder 13 ...... Piston rod, 14 ...... Bearing part

Claims (1)

[Scope of utility model registration request] 1. A guide frame suspended in an excavation hole, a cutter head disposed at a lower end portion of the guide frame for excavating the ground, and an excavated earth and sand disposed above the cutter head. A cutter head for discharging the mud pump; the cutter head having a central portion supported by the guide frame side and horizontally disposed, and a plurality of support drums each having a rotating disk driven to rotate by a motor; A cutter drum attached to both sides of a central support portion of the support drum; and the cutter drum has an excavating blade on an outer peripheral surface and an outer end surface thereof, which rotates integrally with the rotary disc and its axial direction. And a widening driving means for axially slidingly displacing the cutter drum with respect to the support drum. Ground excavator.