JPH08218422A - Underground excavator for nonuniform section excavation - Google Patents

Abstract

PURPOSE: To enlarge the degree of freedom of excavation processing by making a pair of arms for supporting right and left cutter drums individually oscillatable, and individually expanding and contracting each cutter drum. CONSTITUTION: A pair of arms 6, 6 is detachably supported so as to be oscillatable right and left at the lower end of a guide frame 1 elevatably suspended in the ground. Next, cutter drums 7, 7 are rotatably supported at the oscillation end of each arm 6, and a protruding quantity from the side of the guide frame 1 is varied according to the inclination of the arm 6. Each of arms 6 is separately oscillated by a pair of hydraulic cylinders 8, 8. Thus the individual protrusion of each cutter drum 7 from the side of the guide frame 1 becomes possible, and an underground excavator can correspond to any of both side or single side expansive excavation for improving the degree of freedom of excavation processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground excavator used when excavating a variable section.

[0002]

2. Description of the Related Art Generally, a hydro-phrase excavator has fixedly arranged cutter drums that rotate inwardly at the left and right ends of a lower end of a guide frame that is vertically movable in a vertical hole. The ground is excavated by a drum, and the mixture of excavation and muddy water is discharged to the above-ground part through a pumped mud pipe opened at the center of the lower end of the frame.

Therefore, the cross section of the vertical hole excavated by this type of excavator is a straight line continuous in the vertical direction. On the other hand, depending on the type of work, it is necessary to open a vertical hole with a variable cross-sectional shape such as a bottom pile or a skew pile, or to excavate the upper or lower part while avoiding underground obstacles such as existing underground buried objects. In many cases.

Therefore, in such a case, it is generally practiced to prepare a plurality of excavators corresponding to various excavation widths in advance and excavate by exchanging the excavators. However, the setup change is complicated, and if it takes much time, the work efficiency is reduced.

In order to solve this kind of inconvenience, the applicant of the present invention has developed an excavator as disclosed in, for example, Japanese Patent Laid-Open No. 6-128960. This is for excavating by excavating the pair of left and right cutter drums horizontally while displacing them in a direction orthogonal to the rotation axis. The rod connected to the cylinder and the swing frame supporting the cutter drum are symmetrical. It has a structure in which two linking frames are connected to each other by a simple link arm and the two rocking frames are rocked symmetrically at the same time when the rod is moved up and down to expand and contract. There is.

[0006]

However, in this structure, since the cutter drum expands and contracts symmetrically, it is not possible to expand and excavate only one side surface, for example, to be excavated. When performing normal excavation while avoiding underground obstacles that exist on only one side of the section, and when trying to expand and dig the lower part of the obstacles, the side without any underground obstacles will also be expanded and excavated. There was a drawback that it would end up. On the contrary, when the obstacle of one kind exists on one side, there is also a drawback that the opposite side cannot be expanded and excavated.

The present invention solves the above problems, and an object of the present invention is to provide a variable cross-section excavation site capable of increasing the degree of freedom of excavation work by independently expanding and contracting the left and right cutter drums. It provides a medium excavator.

[0008]

In order to achieve the above object, the present invention is directed to a guide frame suspended in the ground so that it can be lifted and lowered, and a pair of left and right swingably supported lower ends of the guide frame. An arm, a cutter drum that is rotatably supported by the swinging end of each arm, and the amount of protrusion from the frame side portion changes according to the inclination of the arm, and a pair of drives that individually swing the pair of arms. And means.

[0009]

According to the above construction, the cutter drums are independently projected from the side portions of the guide frame in accordance with the expansion / contraction motions of the respective driving means, so that the double-sided excavation or the single-sided excavation is performed. Both can be supported.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view showing an underground excavator according to the present invention.

The excavator in the figure is provided with a guide frame 1 which is hung by a crane and supplied into the ground. The guide frame 1 assembles a steel frame into a vertically long rectangular shape, and each horizontal frame arranged between them. A guide frame portion 1a in which the space between steel frames is reinforced by a truss set, and an excavation portion supporting frame 1 integrated under the guide frame portion 1a
It consists of a and.

On the upper and lower sides of the guide frame portion 1a and on the front and rear surfaces (not shown), a plurality of reaction force plates 2 for correcting the position of the guide frame portion 1a and supporting a part of the load are arranged symmetrically on the left and right sides and the front and rear sides. Each reaction force plate 2 is projected to the left and right by a hydraulic cylinder (driving means) not shown, and by controlling the amount of protrusion of the reaction force plate 2, the frame 1 is vertically aligned in the vertical hole and has a predetermined gap with the vertical hole. Keep and be supported. In addition, this reaction force plate 2
The maximum protrusion amount of is set according to the expansion amount of each cutter drum 7 described later.

A sludge pump 3 is arranged in the center of the inside of the guide frame portion 1a, and a lower portion of the pump 3 is connected to a sludge pipe 4 which penetrates through the center of the lower end of the support frame 1b. Is connected to a mud drain hose (not shown), and the pump 3 is driven to discharge the mixture of excavation waste and mud water taken in through the mud pipe 4 to the ground surface.

A pair of arms 6 are swingably supported via pins 5 on both sides of the tip of the support frame 1b, and a cutter drum 7 is rotatably attached to each tip. The cutter drum 7 has a large number of drilling bits planted on its outer circumference. A hydraulic drive motor (not shown) is provided inside the cutter drum 7, and the vertical holes are drilled by rotating these cutters inward as shown by the arrows. To do.

Further, the upper ends of a pair of hydraulic cylinders 8 are fixed in the support frame 1b, and plungers 8a projecting at the tips thereof so as to be retractable are connected to the respective arms 6 via flat link levers 9. There is.

The upper end of the flat link lever 9 is connected to a swing end of a guide link 10, one end of which is swingably supported by a support frame 1b, and the guide pin 1 is connected to this swing end.
1 is projected, and the pin 11 is a guide hole 12 formed in a cover (not shown) provided on the front and rear surfaces of the support frame 1b.
And is used as a guide when swinging.

Therefore, when the plunger 8a is in the retracted state, the arm 6 is tilted inward and pulled up, and the cutter drum 7 is pulled to the inside of the lower end of the support frame 1b, so that the excavation width is minimized. The outer excavation surface in this minimum excavation width slightly projects from the outer side of the support frame 1b, and the inner excavation surface is set at a position where it does not interfere with the mating cutter drum 7 and the sludge pipe 4.

Further, when the plunger 8a is projected, the arm 6 tilts outward, the cutter drum 7 expands outside the support frame 1b, and the excavation width increases.

The cutter drums 7 and the hydraulic cylinders described above are connected to the ground via a hydraulic hose (not shown), and their rotation control and expansion / contraction control can be performed by remote control from a control room provided on the ground. Moreover, the excavation status is measured by the depth gauge and each cutter drum 7.
Are sequentially monitored through a device for measuring the amount of expansion.

2 (a) to 2 (d) show pile shapes excavated by the above excavation control. First, FIG. 2 (a) shows a bottomed pile 20. In this case, in this case, there is a certain underground depth. Until, fix the cutter drums 7 in a state of being pulled together,
Ordinary straight line excavation along the outer shape of the frame 1 is performed, and when the bottom enlarging portion is reached, the cutter drums 7 are sequentially opened and controlled so that the bottom portions on both sides of the general portion 1a are expanded in a tapered manner. Expanded bottom pile 20 having a portion 20b
Can be obtained.

The taper shape corresponds to each hydraulic cylinder 8
Of course, there is a degree of freedom in shape depending on the control mode, and it can be formed only on one side of the general portion 20a, for example.

(B) shows a skew pile 21. In this case, the frame 1 is stopped after the normal excavation with the cutter drums 7 attracted, and the cutter drums 7 are expanded in this state. Excavation is performed while opening, and then the frame 1 is moved downward to perform the expanding excavation, and when it is lowered to a certain extent, control is performed to return to the normal excavation again, and thus a large number of expanding portions 21b are formed on both sides of the general portion 21a. The shaped pile 21 can be obtained. Needless to say, the expanding portions 21b can be alternately formed on one side of the general portion 21a.

(C) shows a pile 22 corresponding to an underground obstacle, and in the case where there is an obstacle A such as a high-voltage cable pipe near the excavation position, after measuring the burial position and depth, Normally, the vicinity of the obstacle A is excavated, and if the lower part of the obstacle A is reached, only one cutter drum 7 is expanded to expand and excavate the lower part of the buried position of the obstacle A. The pile 22 having the expanded portion 22b formed on one side of the general portion 22a is obtained in the lower part of the pile 22. The obstacle A itself is also held in a stable embedded state by the expanded portion 22b.

(D) shows a pile 23 which has been subjected to high-speed widening excavation.
3a is excavated to a predetermined depth, and when it reaches the bottom of the hole, the cutter wall 7 is expanded and the frame 1 is pulled up while excavating, so that the hole wall of the general part 23a is cut down and the widened part 23b is expanded. As a result of being sequentially formed up to the upper surface, the pile 23 having a width corresponding to the expansion amount of the cutter drum 7
Will be obtained early.

[0025]

As described above in detail with reference to the embodiments, in the underground excavator for variable section excavation according to the present invention, each cutter drum is independently operated according to the extension / contraction operation of each drive means. By projecting from the side portion of the guide frame, it is possible to support both double-sided open excavation and single-sided open excavation, and there is an advantage that the degree of freedom of excavation processing can be further increased.

[Brief description of drawings]

FIG. 1 is a front view showing an underground excavator for variable section excavation according to the present invention.

2A to 2D are vertical sectional views showing the shapes of various piles excavated by the underground excavator.

[Explanation of symbols]

 1 Guide frame 6 Arm 7 Cutter drum 8 Hydraulic cylinder (drive means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Sato 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office

Claims (1)

[Claims] 1. A guide frame hung up and down in the ground, a pair of arms oscillatably supported from the lower end of the guide frame in the left-right direction, and rotatably attached to the oscillating ends of the respective arms. A modified cross section comprising: a cutter drum, which is supported and whose projection amount from the side portion of the frame changes according to the inclination of the arms, and a pair of driving means for individually swinging the pair of arms. Underground excavator for excavation.