JPH10140601A - Horizontal multishaft excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the excavating length of one edge of a polygonal shaft half of the conventional length by supporting two drum cutter rotating horizontal rotating shafts by one frame, bending the frame in the bearing parts of the rotating shafts, and providing an angle regulating mechanism capable of regulating the bending angle. SOLUTION: Two side frames are arranged adjacently to a center frame 1, and connected through angle regulating mechanisms 20 provided on the upper stage, middle stage and lower stage of the center frame 1. A rotating shaft is provided on the lower end part of the side frame 2 so as to be extended from the front side to the reverse side, and disc-like drum cutters 6 are provided on both ends thereof. When the bending angle of the frame 2 is regulated, the space between excavating inside nuts is narrowed, and the space between excavating outside nuts is extended. The angle formed by the vertical lines of the two side frames 2 is α deg., and the α is properly set, whereby the frames 2 are bent to form various excavated holes. Thus, the excavating length of one edge of a polygonal shaft can be set to half of the conventional length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator used for an underground continuous wall construction method, and more particularly, to a horizontal multi-axis excavator.

[0002]

2. Description of the Related Art Generally, in order to construct an underground continuous wall such as a shaft, a ring-shaped (precisely, polygonal ring) hole is formed vertically downward as a space to be constructed. Excavated. For the excavation, various types of excavators are used depending on the excavation conditions. In a state where a rectangular parallelepiped frame is raised, two lower rotation axes are provided at the lower end thereof and the rotation axes are parallel to each other. A so-called horizontal multi-axis excavator having a cylindrical drum cutter at each end is also used. The excavator is used by being suspended from the upper part of the turret or the boom of a crawler crane by a wire, and in one excavation, as shown in FIG. It is formed vertically downward. When one excavation is completed, the excavator is lifted by the wire and moves to the next excavation. The length of the rectangular excavation hole in the long side direction substantially corresponds to the sum of the diameters of two adjacent drum cutters. Subsequently, for example, one side of the polygon is skipped, one side 11b adjacent thereto is excavated, and then the one side 11c that has been skipped is excavated, and the process is repeated a plurality of times to form a polygon as shown in FIG. A drill hole 11 is formed.

[0003]

Normally, in the continuous underground wall of a polygonal shaft, it is preferable to make the length of one side of the polygon as short as possible and approximate it to a cylindrical shape in order to counter the earth pressure. In the conventional excavator, the length of one side cannot be reduced to less than the sum of the diameters of the drum cutters because the two rotating shafts are mounted in parallel with each other.

The present invention has been made in view of such circumstances, and the length of one side of a polygonal shaft can be reduced to half the length of a conventional shaft (approximately the diameter of one drum cutter). It is an object to provide a horizontal multi-axis excavator.

[0005]

In the horizontal multi-axis excavator of the present invention, two horizontal rotary shafts for rotating a drum cutter are supported by one frame, and the above-mentioned frame is supported by a support portion of each rotary shaft. It is characterized by having an angle adjusting mechanism that can bend between the two and adjust the bending angle.

According to this structure, the two rotating shafts are supported by the frame at a predetermined angle on a horizontal plane by bending the frame using the angle adjusting mechanism. Thereby, the two rotating shafts rotate at a predetermined angle to each other, and accordingly, the drum cutter also rotates at a predetermined angle to each other. Therefore, the vertical projection shape of the drum cutter on the ground is a shape (bend shape or linear shape) obtained by connecting the respective drum cutters at a predetermined angle with the diameter of each drum cutter as one side, and the drum cutter in such a state is placed on the ground. When the two rotating shafts are in a non-parallel state, a cylindrical excavation hole 12a (see FIG. 5) having the above-mentioned bent shape is formed by one excavation when pressed in a vertically downward direction. can do. By repeating the operation a plurality of times, a polygonal excavation hole 12 as shown in FIG. 5 can be formed as a whole, and the length of one side is 1 in comparison with the case where a conventional excavator is used. / 2 excavation holes can be formed. If the two rotation axes are in parallel, 1
The round excavation can form a cylindrical excavation hole (not shown) having the linear shape.

Further, since the frame is bent using an angle adjusting mechanism capable of adjusting the bending angle, the degree of bending of the frame can be freely adjusted, and accordingly, the angle between the drum cutters can be freely adjusted. Can be adjusted. If the angle adjusting mechanism here is constituted by, for example, a rotating mechanism using a hinge or the like and a holding mechanism that holds the predetermined angle when the rotation reaches a predetermined angle, the bending angle of the frame is set to the target angle. The angle can be freely adjusted so that the angle can be maintained even during excavation. If the holding mechanism is composed of, for example, a bolt and a nut, and the angle can be adjusted by rotating the nut on the bolt, the angle can be held with a simple configuration.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of a horizontal multi-axis excavator according to the present invention, and FIG. 2 is a side view thereof.

As shown in FIGS. 1 and 2, two side frames 2 are disposed adjacent to a center frame 1, and these side frames 2 are provided in the upper, middle,
And an angle adjustment mechanism 20 provided at the lower stage. An angle adjusting mechanism 20 holds a hinge 4 that rotatably supports the frame 2 on the frame 1 and holds the frame 2 at a predetermined angle with respect to the frame 1 due to the rotation. And a nut 10 attached to the angle fixing bolt 3. A submersible sand pump 5 and the like are mounted on the center frame 1, and a suspension 8 connected to a wire output from a crawler crane or the like is provided on the top of the side frame 2. Are provided with guides 7 that are in contact with the walls of the drill holes. One rotating shaft 9 is provided at the lower end of the side frame 2. Both rotating shafts 9 extend from the front side to the back side of the side frame 2, and disk-shaped drum cutters 6 are provided at both ends thereof. Have been. That is, in this example, a total of four drum cutters 6 are provided.
The drum cutter 6 rotates in the direction of the arrow in FIG.

Next, the characteristic structure of the excavator of the present invention will be described with reference to FIG. FIG. 3A is a cross-sectional view taken along the line AA of FIG. 1 and shows a state in which the frame is not bent, and FIG. 3B shows a state in which the frame is bent by α °. The function of this frame will be described. (The hatched lines are omitted for simplicity).

As shown in FIG. 3A, side frames 2a and 2b are rotatably supported by hinges 4 at both ends of the center frame 1. Protrusions 21 are formed on both side ends of the frame 1 and the inside ends of the frame 2, respectively, and the protrusions 21 are formed with through holes for holding the bolts 3. A nut 10 is provided on the bolt 3 so as to be in contact with one end of the protrusion 21, and two nuts 10 are provided for one bolt. This figure 3
In (a), the interval between the nuts 10 on the outside of the excavation is equal to the interval between the nuts 10 on the inside of the excavation, so that the front of the center frame 1 and the fronts of the side frames 2a and 2b are parallel to each other and on the same plane. positioned.

In such a configuration, when adjusting the bending angle of the frame, as shown in FIG. 3B, the interval between the nuts 10 on the inner side of the excavation is reduced while the interval between the nuts 10 on the outer side of the excavation is increased. Then, the side frame 2a
The angle between the vertical line standing in front of the front frame and the vertical line standing in front of the side frame 2b is α °. By appropriately setting α, the frame bends at various angles, and accordingly, various bending shapes are formed. Can be formed.

Here, the following formulas are provided for the case where the excavation is performed with the angle α ° adjusted, and when the excavation is completed, a regular N-sided excavation hole is formed as a whole. α = 360 / N (Equation 1) Here, for example, when α = 30, when excavation is completed, 12
A square drill hole will be formed.

A case where the frame is bent and a case where the frame is not bent will be described with reference to FIG. FIG.
4A is a cross-sectional view taken along the line BB of FIG. 1 in the state of FIG. 3A, that is, in a state where the frame is not bent.
3B is a cross-sectional view taken along the line BB of FIG. 1 in a state of FIG. 3B, that is, a state in which the frame is bent (oblique lines are omitted for simplicity).

As shown in FIG. 4A, when the frame is not bent, the rotation shafts 9a and 9b supported by the side frames are positioned parallel to each other.
As a result, the front and back surfaces of the drum cutters 6a to 6d are also parallel to each other, so that a single excavation forms a cylindrical excavation hole having a rectangular shape when viewed from above. In this case, a dedicated drum cutter is used when the frame is not bent, and has a cylindrical shape.

Next, a case where the frame is bent will be described. As shown in FIG. 4B, the rotating shafts 9a and 9b form a predetermined angle with each other according to the bending state of the frame. In other words, in FIG. 3, when the angle between the perpendicular that stands on the front of the side frame 2a and the perpendicular that stands on the front of the side frame 2b is α °, the rotation axis 9a and the rotation axis 9b
Is also α °, and the drum cutter 6
A vertical line and drum cutter 6 standing in front of a ', 6b'
The angle formed by the vertical line standing in front of c ′ and 6d ′ is also α °. Therefore, in one excavation, an excavation hole is formed such that the shape as viewed from above becomes a rectangular shape Q. In this case,
As the drum cutter, a dedicated one is used when the frame is bent, and its shape is a truncated cone, and the drum cutters 6b 'and 6d' are respectively provided on the extension lines of the cutting edges of the drum cutters 6a 'and 6c'. Is formed so that the edge of the blade is located.

Next, the construction state in the case of excavating with a drum cutter dedicated to bending the frame will be described with reference to FIG. FIG. 5 is a plan view of the excavation hole in a state where excavation has been completed by the drum cutters 6a ′ to 6d ′ in FIG. FIG. 6 shows a case where a drilling hole having the same diameter as the drilling hole in FIG. 5 is formed by a conventional drilling machine.

As shown in FIG. 6, it is assumed that a conventional excavator has formed, for example, a decagonal excavation hole 11. When the same diameter is excavated by the excavator of the present invention, FIG.
As shown in FIG. That is, it is possible to excavate in a state closer to a circle than before, thereby increasing the strength of the shaft. The order of excavation is, for example, excavation of 12a, excavation of 12b, and then 1
The order of excavating 2c may be adopted.

When the drum cutters 6a to 6d shown in FIG. 4 are used, the shape of one excavation becomes rectangular when viewed from above. For example, it is used when constructing an underground continuous wall of a subway station.

In the transition from the mode in which the frame is bent and used to the mode in which the frame is used without bending, or in the transition from the mode in which the frame is used without bending to the mode in which the frame is bent, the drum cutter is used. , And only the bending angle of the frame needs to be adjusted.

[0021]

According to the horizontal multi-shaft excavator of the present invention, the excavation can be performed such that one side of the polygonal shaft is substantially equal to the diameter of one drum cutter. Excavation can be performed such that the length of one side is half that of the case where a horizontal multi-axis excavator is used. Therefore, it is possible to construct a shaft which is stronger than before, and thereby it is possible to construct a shaft having a larger diameter than before even though the thickness of the wall is unchanged. In the case of the same diameter, the thickness of the wall can be reduced, thereby reducing the amount of excavated soil and the amount of poured concrete, thereby achieving a reduction in construction cost.

Further, since the horizontal multi-axis excavator of the present invention has a mechanism for adjusting the bending angle of the frame, it is possible to cope with shafts having various diameters only by using the mechanism.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a horizontal multi-axis excavator according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 1, showing a case where the frame is not bent (a) and a case where the frame is bent (b).

FIG. 4 is a cross-sectional view taken along the line BB of FIG. 1, showing a case where the frame is not bent (a) and a case where the frame is bent (b).

FIG. 5 is a plan view of an excavation hole when excavating in the state shown in FIGS. 3 (b) and 4 (b).

FIG. 6 is a plan view of an excavation hole when excavating with a conventional excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Center frame 2 ... Side frame 3 ... Angle fixing bolt 4 ... Hinge 6,6a-6d, 6a'-6d '... Drum cutter 9,9a, 9b ··· Rotary shaft 10 ··· Nut 20 ··· Angle adjustment mechanism

Claims (1)

[Claims] 1. A horizontal multi-axis excavator in which two horizontal rotating shafts are supported by one frame, and each rotating shaft is provided with a drum cutter. A horizontal multi-axis excavator characterized by having an angle adjusting mechanism capable of bending between bearing portions and adjusting the bending angle.